/* roulang page: index */
/* ========== 设计变量 ========== */
:root {
  --c-bg: #F5F2ED;
  --c-bg-alt: #EAEFEC;
  --c-surface: #FFFFFF;
  --c-primary: #14565A;
  --c-primary-deep: #0C3F42;
  --c-primary-soft: #DDE9E6;
  --c-accent: #C08A4E;
  --c-ink: #1F2626;
  --c-text-2: #5D6866;
  --c-border: #DCE2E0;
  --c-success: #2E7D52;
  --c-error: #B84A4A;
  --c-disabled: #B9C0BF;
  --radius-card: 12px;
  --radius-btn: 8px;
  --radius-badge: 999px;
  --shadow-sm: 0 1px 2px rgba(31,38,38,0.04);
  --shadow-md: 0 16px 40px -12px rgba(31,38,38,0.18);
  --shadow-lg: 0 24px 64px -16px rgba(31,38,38,0.28);
  --container-max: 1280px;
  --font-sans: "HarmonyOS Sans SC", "MiSans", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --space-section: clamp(4rem, 9vw, 7rem);
}

/* ========== Reset & Base ========== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  background: var(--c-bg);
  color: var(--c-ink);
  line-height: 1.8;
  font-size: 1rem;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; transition: color .25s ease; }
img { max-width: 100%; display: block; height: auto; }
button { font-family: inherit; border: none; background: none; cursor: pointer; }
input, select, textarea { font-family: inherit; }
ul, ol { list-style: none; }
:focus-visible {
  outline: 2px solid var(--c-primary);
  outline-offset: 2px;
  border-radius: 4px;
}

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 clamp(1.25rem, 4vw, 4rem);
}

/* ========== Header / Nav ========== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(245, 242, 237, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--c-border);
  transition: box-shadow .3s ease;
}
.site-header.scrolled { box-shadow: 0 4px 20px rgba(31,38,38,0.06); }
.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.logo {
  display: flex;
  align-items: baseline;
  gap: 8px;
  flex-shrink: 0;
}
.logo-text {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--c-primary);
  line-height: 1.2;
}
.logo-sub {
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--c-text-2);
  letter-spacing: 0.08em;
  padding-left: 8px;
  border-left: 1px solid var(--c-border);
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}
.main-nav a {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--c-ink);
  padding: 6px 2px;
  position: relative;
  transition: color .25s ease;
}
.main-nav a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--c-primary);
  transition: width .3s ease;
}
.main-nav a:hover { color: var(--c-primary); }
.main-nav a:hover::after { width: 100%; }
.main-nav a.active { color: var(--c-primary); font-weight: 600; }
.main-nav a.active::after { width: 100%; }
.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--c-primary);
  color: #fff;
  font-size: 0.9375rem;
  font-weight: 500;
  padding: 10px 20px;
  border-radius: var(--radius-btn);
  transition: background .25s ease, transform .25s ease, box-shadow .25s ease;
  box-shadow: var(--shadow-sm);
}
.nav-cta:hover {
  background: var(--c-primary-deep);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
  color: #fff;
}
.nav-cta:active { transform: translateY(0); }

/* ========== Mobile Bottom Tab ========== */
.mobile-tab {
  display: none;
}

/* ========== Hero ========== */
.hero {
  position: relative;
  padding: clamp(3rem, 6vw, 5rem) 0 clamp(2.5rem, 5vw, 4rem);
  background: var(--c-bg);
}
.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}
.hero-copy { max-width: 580px; }
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--c-primary-soft);
  color: var(--c-primary);
  font-size: 0.8125rem;
  font-weight: 500;
  padding: 6px 16px;
  border-radius: var(--radius-badge);
  margin-bottom: 20px;
}
.hero-badge::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-accent);
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin-bottom: 16px;
  color: var(--c-ink);
}
.hero h1 .brand-highlight {
  color: var(--c-primary);
}
.hero-sub {
  font-size: 1.0625rem;
  color: var(--c-text-2);
  line-height: 1.7;
  margin-bottom: 28px;
  max-width: 480px;
}
.hero-painpoints {
  margin-bottom: 32px;
  border-top: 1px solid var(--c-border);
}
.hero-painpoints li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--c-border);
  font-size: 0.9375rem;
  color: var(--c-text-2);
  line-height: 1.6;
}
.hero-painpoints li::before {
  content: '?';
  display: inline-flex;
  width: 22px;
  height: 22px;
  align-items: center;
  justify-content: center;
  background: var(--c-primary-soft);
  color: var(--c-primary);
  font-size: 0.75rem;
  font-weight: 700;
  border-radius: 50%;
  flex-shrink: 0;
  margin-top: 2px;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.9375rem;
  font-weight: 600;
  padding: 14px 32px;
  border-radius: var(--radius-btn);
  transition: all .3s ease;
  border: 1px solid transparent;
}
.btn-primary {
  background: var(--c-primary);
  color: #fff;
  box-shadow: var(--shadow-sm);
}
.btn-primary:hover {
  background: var(--c-primary-deep);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  color: #fff;
}
.btn-primary:active { transform: translateY(0); }
.btn-primary .arrow { transition: transform .3s ease; }
.btn-primary:hover .arrow { transform: translateX(4px); }
.btn-outline {
  background: transparent;
  color: var(--c-primary);
  border-color: var(--c-primary);
}
.btn-outline:hover {
  background: var(--c-primary-soft);
  transform: translateY(-2px);
  color: var(--c-primary-deep);
}
.hero-media {
  position: relative;
  border-radius: var(--radius-card);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}
.hero-media img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
}
.hero-media::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(20, 86, 90, 0.04);
}
.hero-trust {
  display: flex;
  flex-wrap: wrap;
  gap: 28px;
  margin-top: clamp(2rem, 4vw, 3rem);
  padding-top: 20px;
  border-top: 1px solid var(--c-border);
}
.hero-trust span {
  font-size: 0.8125rem;
  color: var(--c-text-2);
  display: flex;
  align-items: center;
  gap: 8px;
}
.hero-trust span::before {
  content: '✓';
  color: var(--c-accent);
  font-weight: 700;
}

/* ========== Solutions Section ========== */
.solutions-section {
  padding: var(--space-section) 0;
  background: var(--c-bg);
}
.section-header {
  margin-bottom: 3rem;
  max-width: 720px;
}
.section-kicker {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--c-accent);
  margin-bottom: 12px;
}
.section-header h2 {
  font-size: clamp(1.5rem, 2.6vw, 2.25rem);
  font-weight: 700;
  line-height: 1.25;
  color: var(--c-ink);
  margin-bottom: 12px;
}
.section-header p {
  color: var(--c-text-2);
  font-size: 1rem;
  line-height: 1.7;
}
.solutions-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(1.25rem, 2vw, 2rem);
}
.solution-card {
  background: var(--c-surface);
  border-radius: var(--radius-card);
  border: 1px solid var(--c-border);
  padding: 2rem;
  transition: transform .3s ease, box-shadow .3s ease, border-color .3s ease;
  box-shadow: var(--shadow-sm);
}
.solution-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--c-primary);
}
.solution-card.featured {
  grid-column: 1 / -1;
}
.solution-card.half {
  grid-column: span 1;
}
.solution-card .card-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--c-primary-soft);
  border-radius: 10px;
  margin-bottom: 16px;
  color: var(--c-primary);
}
.solution-card .card-icon svg {
  width: 24px;
  height: 24px;
}
.solution-card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--c-ink);
}
.solution-card p {
  color: var(--c-text-2);
  font-size: 0.9375rem;
  line-height: 1.7;
  margin-bottom: 16px;
}
.card-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--c-primary);
  background: var(--c-primary-soft);
  padding: 4px 14px;
  border-radius: var(--radius-badge);
  margin-bottom: 16px;
}
.card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--c-primary);
  transition: gap .25s ease;
}
.card-link:hover { gap: 12px; color: var(--c-primary-deep); }
.solution-card.featured .featured-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: center;
}
.solution-card.featured img {
  border-radius: 8px;
  max-height: 260px;
  object-fit: cover;
  width: 100%;
}
.solution-card.featured .text-col { padding-right: 1rem; }

/* ========== Stats Section ========== */
.stats-section {
  background: var(--c-primary);
  padding: clamp(2.5rem, 5vw, 4rem) 0;
  color: #fff;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
}
.stat-item {
  text-align: center;
  padding: 1.5rem 1rem;
  border-right: 1px solid rgba(255,255,255,0.12);
}
.stat-item:last-child { border-right: none; }
.stat-number {
  font-size: clamp(2.5rem, 6vw, 3.5rem);
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  line-height: 1.2;
  color: #fff;
  margin-bottom: 4px;
}
.stat-number .suffix {
  font-size: 0.6em;
  font-weight: 500;
  margin-left: 4px;
  color: var(--c-accent);
}
.stat-label {
  font-size: 0.875rem;
  color: rgba(255,255,255,0.85);
  opacity: 0.85;
}

/* ========== News Section ========== */
.news-section {
  padding: var(--space-section) 0;
  background: var(--c-bg-alt);
}
.news-layout {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: clamp(1.5rem, 3vw, 2.5rem);
  align-items: start;
}
.news-featured {
  background: var(--c-surface);
  border-radius: var(--radius-card);
  overflow: hidden;
  border: 1px solid var(--c-border);
  box-shadow: var(--shadow-sm);
  transition: box-shadow .3s ease, transform .3s ease;
}
.news-featured:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}
.news-featured-media {
  overflow: hidden;
  aspect-ratio: 16/9;
}
.news-featured-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .5s ease;
}
.news-featured:hover .news-featured-media img { transform: scale(1.03); }
.news-featured-body { padding: 1.75rem; }
.news-featured-body h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 12px 0 8px;
  line-height: 1.4;
}
.news-featured-body p {
  font-size: 0.9375rem;
  color: var(--c-text-2);
  margin-bottom: 14px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.news-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--c-primary);
  background: var(--c-primary-soft);
  padding: 4px 14px;
  border-radius: var(--radius-badge);
}
.news-meta {
  font-size: 0.8125rem;
  color: var(--c-text-2);
}

.news-side-list {
  background: var(--c-surface);
  border-radius: var(--radius-card);
  border: 1px solid var(--c-border);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.news-item {
  border-bottom: 1px solid var(--c-border);
  position: relative;
  transition: background .25s ease;
}
.news-item:last-child { border-bottom: none; }
.news-item a {
  display: block;
  padding: 1rem 1.5rem;
  position: relative;
  transition: background .25s ease;
}
.news-item a:hover { background: var(--c-primary-soft); }
.news-item a::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--c-primary);
  opacity: 0;
  transition: opacity .25s ease;
}
.news-item a:hover::before { opacity: 1; }
.news-item h4 {
  font-size: 0.9375rem;
  font-weight: 600;
  margin: 6px 0 4px;
  line-height: 1.5;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.news-item p {
  font-size: 0.8125rem;
  color: var(--c-text-2);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 6px;
}
.news-empty {
  background: var(--c-surface);
  border: 1px dashed var(--c-border);
  border-radius: var(--radius-card);
  padding: 3rem;
  text-align: center;
  color: var(--c-text-2);
  font-size: 0.9375rem;
}
.news-empty .empty-icon {
  font-size: 2.5rem;
  margin-bottom: 12px;
  opacity: 0.4;
}

/* ========== FAQ Section ========== */
.faq-section {
  padding: var(--space-section) 0;
  background: var(--c-bg);
}
.faq-list {
  max-width: 780px;
  margin: 0 auto;
}
.faq-item {
  border-bottom: 1px solid var(--c-border);
}
.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  width: 100%;
  padding: 20px 0;
  font-size: 1rem;
  font-weight: 600;
  color: var(--c-ink);
  text-align: left;
  cursor: pointer;
  transition: color .25s ease;
}
.faq-question:hover { color: var(--c-primary); }
.faq-icon {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--c-primary);
  transition: transform .35s ease;
}
.faq-icon::before {
  content: '+';
  font-size: 1.25rem;
  font-weight: 300;
  line-height: 1;
}
.faq-item.active .faq-icon { transform: rotate(45deg); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height .35s ease;
}
.faq-answer-inner {
  padding: 0 0 20px;
  font-size: 0.9375rem;
  color: var(--c-text-2);
  line-height: 1.8;
  max-width: 95%;
}

/* ========== CTA Banner ========== */
.cta-section {
  padding: var(--space-section) 0;
  background: var(--c-bg);
}
.cta-banner {
  max-width: 980px;
  margin: 0 auto;
  background: var(--c-bg-alt);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-card);
  padding: clamp(2rem, 5vw, 3.5rem);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 2rem;
  position: relative;
  overflow: hidden;
}
.cta-banner::after {
  content: '';
  position: absolute;
  bottom: -20px;
  right: -20px;
  width: 180px;
  height: 60px;
  border-radius: 50%;
  background: var(--c-accent);
  opacity: 0.08;
}
.cta-banner h2 {
  font-size: clamp(1.5rem, 2.5vw, 2rem);
  font-weight: 700;
  line-height: 1.3;
  color: var(--c-ink);
  margin-bottom: 8px;
}
.cta-banner p {
  color: var(--c-text-2);
  font-size: 0.9375rem;
  max-width: 420px;
}
.cta-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

/* ========== Footer ========== */
.site-footer {
  background: var(--c-ink);
  color: rgba(255,255,255,0.85);
  padding: clamp(3rem, 5vw, 4rem) 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: clamp(1.5rem, 3vw, 2.5rem);
  padding-bottom: 2.5rem;
}
.footer-brand .logo-text {
  color: #fff;
  font-size: 1.375rem;
  margin-bottom: 12px;
}
.footer-brand .logo-sub {
  color: rgba(255,255,255,0.5);
  border-left-color: rgba(255,255,255,0.2);
}
.footer-brand p {
  font-size: 0.875rem;
  color: rgba(255,255,255,0.6);
  line-height: 1.7;
  margin-top: 16px;
  max-width: 280px;
}
.footer-col h4 {
  font-size: 0.9375rem;
  font-weight: 600;
  color: #fff;
  margin-bottom: 16px;
}
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul a {
  font-size: 0.875rem;
  color: rgba(255,255,255,0.65);
  transition: color .25s ease;
}
.footer-col ul a:hover { color: var(--c-accent); }
.footer-contact li {
  font-size: 0.875rem;
  color: rgba(255,255,255,0.65);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.footer-contact li span {
  color: var(--c-accent);
  flex-shrink: 0;
}
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-bottom p {
  font-size: 0.8125rem;
  color: rgba(255,255,255,0.5);
}
.footer-bottom .footer-links {
  display: flex;
  gap: 24px;
}
.footer-bottom .footer-links a {
  font-size: 0.8125rem;
  color: rgba(255,255,255,0.5);
}
.footer-bottom .footer-links a:hover { color: #fff; }

/* ========== Modal ========== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15,25,25,0.5);
  backdrop-filter: blur(4px);
  z-index: 200;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.modal-overlay.open { display: flex; }
.modal-card {
  background: var(--c-surface);
  border-radius: var(--radius-card);
  width: 480px;
  max-width: 100%;
  padding: 2rem;
  box-shadow: var(--shadow-lg);
  max-height: 90vh;
  overflow-y: auto;
}
.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}
.modal-header h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--c-ink);
}
.modal-close {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--c-bg-alt);
  color: var(--c-text-2);
  font-size: 1.125rem;
  transition: background .25s ease, color .25s ease;
}
.modal-close:hover { background: var(--c-primary-soft); color: var(--c-primary); }
.form-group { margin-bottom: 18px; }
.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--c-ink);
  margin-bottom: 6px;
}
.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-btn);
  font-size: 0.9375rem;
  background: var(--c-bg);
  color: var(--c-ink);
  transition: border-color .25s ease, box-shadow .25s ease;
}
.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--c-primary);
  box-shadow: 0 0 0 3px rgba(20,86,90,0.12);
  background: #fff;
}
.form-group input.invalid,
.form-group textarea.invalid {
  border-color: var(--c-error);
}
.error-msg {
  font-size: 0.75rem;
  color: var(--c-error);
  margin-top: 4px;
  display: none;
}
.form-group input.invalid + .error-msg,
.form-group textarea.invalid + .error-msg { display: block; }
.form-group textarea { min-height: 80px; resize: vertical; }
.form-submit {
  width: 100%;
  background: var(--c-primary);
  color: #fff;
  font-size: 0.9375rem;
  font-weight: 600;
  padding: 14px;
  border-radius: var(--radius-btn);
  transition: background .25s ease, box-shadow .25s ease;
  margin-top: 8px;
}
.form-submit:hover {
  background: var(--c-primary-deep);
  box-shadow: var(--shadow-md);
}
.privacy-note {
  font-size: 0.75rem;
  color: var(--c-text-2);
  text-align: center;
  margin-top: 12px;
  line-height: 1.5;
}
.form-success {
  display: none;
  text-align: center;
  padding: 2rem 0;
}
.form-success .success-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 16px;
  background: var(--c-success);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.5rem;
}
.form-success p {
  font-size: 0.9375rem;
  color: var(--c-ink);
  font-weight: 500;
}

/* ========== Reveal Animation ========== */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .6s ease, transform .6s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ========== Responsive ========== */
@media (max-width: 1023px) {
  .hero-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .hero-media { order: -1; }
  .solutions-grid { grid-template-columns: 1fr; }
  .solution-card.featured { grid-column: 1; }
  .solution-card.half { grid-column: 1; }
  .solution-card.featured .featured-row { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .stat-item { border-right: none; border-bottom: 1px solid rgba(255,255,255,0.12); padding: 1rem; }
  .stat-item:nth-last-child(-n+2) { border-bottom: none; }
  .news-layout { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 767px) {
  .main-nav, .nav-cta { display: none; }
  .mobile-tab {
    display: flex;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 64px;
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(12px);
    border-top: 1px solid var(--c-border);
    z-index: 150;
    padding-bottom: env(safe-area-inset-bottom);
  }
  .mobile-tab a {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    font-size: 0.625rem;
    color: var(--c-text-2);
    position: relative;
    transition: color .25s ease;
  }
  .mobile-tab a svg {
    width: 20px;
    height: 20px;
    stroke-width: 1.6;
  }
  .mobile-tab a.active {
    color: var(--c-primary);
    font-weight: 600;
  }
  .mobile-tab a.active::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 24px;
    height: 3px;
    border-radius: 0 0 4px 4px;
    background: var(--c-primary);
  }
  body { padding-bottom: 80px; }
  .cta-banner { flex-direction: column; align-items: flex-start; }
  .cta-actions { width: 100%; }
  .cta-actions .btn { flex: 1; }
}

@media (max-width: 639px) {
  .stats-grid { grid-template-columns: 1fr; }
  .stat-item { border-bottom: 1px solid rgba(255,255,255,0.12); }
  .stat-item:last-child { border-bottom: none; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; }
  .footer-grid { grid-template-columns: 1fr; gap: 2rem; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .solution-card { padding: 1.25rem; }
  .faq-question { font-size: 0.9375rem; }
  .hero-trust { gap: 16px; flex-direction: column; }
  .news-featured-body { padding: 1.25rem; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
}

/* roulang page: category1 */
:root {
  --c-bg: #F5F2ED;
  --c-bg-alt: #EAEFEC;
  --c-surface: #FFFFFF;
  --c-primary: #14565A;
  --c-primary-deep: #0C3F42;
  --c-primary-soft: #DDE9E6;
  --c-accent: #C08A4E;
  --c-ink: #1F2626;
  --c-text-2: #5D6866;
  --c-border: #DCE2E0;
  --c-success: #2E7D52;
  --c-error: #B84A4A;
  --c-disabled: #B9C0BF;
  --radius-card: 12px;
  --radius-btn: 8px;
  --radius-input: 8px;
  --radius-badge: 999px;
  --shadow-default: 0 1px 2px rgba(31,38,38,0.04);
  --shadow-hover: 0 16px 40px -12px rgba(31,38,38,0.18);
  --shadow-modal: 0 24px 64px -16px rgba(31,38,38,0.28);
  --space-section: clamp(4rem, 9vw, 7rem);
  --font-family: HarmonyOS Sans SC, MiSans, PingFang SC, Microsoft YaHei, Helvetica Neue, Arial, sans-serif;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { font-family: var(--font-family); background: var(--c-bg); color: var(--c-ink); line-height: 1.8; -webkit-font-smoothing: antialiased; }
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input, textarea { font-family: inherit; border: none; outline: none; }
.container { max-width: 1280px; margin: 0 auto; padding-left: 64px; padding-right: 64px; }
:focus-visible { outline: 2px solid var(--c-primary); outline-offset: 2px; border-radius: 2px; }

/* ===== Header ===== */
.site-header { position: sticky; top: 0; z-index: 100; background: rgba(245,242,237,0.92); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); border-bottom: 1px solid var(--c-border); transition: box-shadow 0.3s ease; height: 72px; }
.site-header.scrolled { box-shadow: 0 6px 24px rgba(31,38,38,0.08); }
.nav-wrapper { height: 72px; display: flex; align-items: center; gap: 2rem; }
.logo { display: flex; align-items: baseline; gap: 8px; flex-shrink: 0; }
.logo-text { font-size: 1.25rem; font-weight: 800; letter-spacing: -0.01em; color: var(--c-primary); }
.logo-sub { font-size: 0.75rem; font-weight: 600; color: var(--c-text-2); }
.main-nav { display: flex; align-items: center; gap: 28px; margin-left: auto; }
.main-nav a { position: relative; font-size: 0.9375rem; font-weight: 500; color: var(--c-text-2); padding: 6px 2px; transition: color 0.25s ease; }
.main-nav a::after { content: ''; position: absolute; left: 50%; bottom: -2px; width: 0; height: 2px; background: var(--c-primary); transition: all 0.3s ease; transform: translateX(-50%); }
.main-nav a:hover, .main-nav a.active { color: var(--c-primary); }
.main-nav a:hover::after, .main-nav a.active::after { width: 100%; }
.nav-cta { display: inline-flex; align-items: center; gap: 6px; background: var(--c-primary); color: #fff; font-size: 0.875rem; font-weight: 600; padding: 10px 20px; border-radius: var(--radius-btn); transition: all 0.3s ease; box-shadow: 0 2px 8px rgba(20,86,90,0.2); }
.nav-cta:hover { background: var(--c-primary-deep); transform: translateY(-2px); box-shadow: 0 8px 20px rgba(20,86,90,0.28); }
.nav-cta .arrow { display: inline-block; transition: transform 0.3s ease; }
.nav-cta:hover .arrow { transform: translateX(4px); }

/* ===== Mobile Bottom Tabs ===== */
.bottom-tabs { display: none; }
@media (max-width: 1023px) {
  .main-nav { display: none; }
  .nav-cta { display: none; }
  .bottom-tabs { display: flex; position: fixed; bottom: 0; left: 0; right: 0; z-index: 100; height: 64px; background: rgba(255,255,255,0.92); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px); border-top: 1px solid var(--c-border); box-shadow: 0 -4px 16px rgba(31,38,38,0.06); }
  .bottom-tabs .tab-item { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 2px; color: var(--c-text-2); font-size: 10px; font-weight: 500; position: relative; transition: color 0.3s ease; }
  .bottom-tabs .tab-item svg { width: 22px; height: 22px; stroke: currentColor; fill: none; stroke-width: 1.8; }
  .bottom-tabs .tab-item::before { content: ''; position: absolute; top: 0; left: 50%; transform: translateX(-50%); width: 0; height: 3px; border-radius: 0 0 4px 4px; background: var(--c-primary); transition: width 0.3s ease; }
  .bottom-tabs .tab-item.active { color: var(--c-primary); }
  .bottom-tabs .tab-item.active::before { width: 28px; }
  body { padding-bottom: 96px; }
}
@media (max-width: 639px) {
  .container { padding-left: 20px; padding-right: 20px; }
  .nav-wrapper { gap: 1rem; }
}

/* ===== Breadcrumb ===== */
.breadcrumb { padding: 22px 0 0; font-size: 0.875rem; color: var(--c-text-2); }
.breadcrumb a { color: var(--c-text-2); transition: color 0.25s ease; }
.breadcrumb a:hover { color: var(--c-primary); }
.breadcrumb .sep { margin: 0 8px; color: var(--c-border); }

/* ===== Page Header ===== */
.page-header { padding: 48px 0 0; }
.page-header h1 { font-size: clamp(2rem, 5vw, 3.5rem); font-weight: 800; line-height: 1.15; letter-spacing: -0.01em; color: var(--c-ink); }
.page-header .page-sub { margin-top: 16px; font-size: 1.0625rem; color: var(--c-text-2); max-width: 640px; line-height: 1.9; }
.page-header .page-lead { margin-top: 12px; font-size: 0.9rem; color: var(--c-primary); font-weight: 600; }

/* ===== Service Cards ===== */
.service-cluster { padding: var(--space-section) 0; }
.service-cluster .section-head { display: flex; align-items: flex-end; justify-content: space-between; flex-wrap: wrap; gap: 16px; margin-bottom: 40px; }
.service-cluster .section-head h2 { font-size: clamp(1.5rem, 2.6vw, 2.25rem); font-weight: 700; line-height: 1.25; }
.service-cluster .section-head p { font-size: 0.9375rem; color: var(--c-text-2); max-width: 420px; text-align: right; line-height: 1.8; }
.service-grid { display: grid; grid-template-columns: 1fr; gap: 2rem; }
.service-card { background: var(--c-surface); border: 1px solid var(--c-border); border-radius: var(--radius-card); padding: 2rem; box-shadow: var(--shadow-default); transition: transform 0.35s ease, box-shadow 0.35s ease, border-color 0.35s ease; display: flex; flex-direction: column; position: relative; overflow: hidden; }
.service-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); border-color: var(--c-primary); }
.service-card .sc-icon { width: 48px; height: 48px; border-radius: 10px; background: var(--c-primary-soft); display: flex; align-items: center; justify-content: center; margin-bottom: 20px; color: var(--c-primary); }
.service-card .sc-icon svg { width: 24px; height: 24px; stroke: currentColor; fill: none; stroke-width: 1.8; }
.service-card h3 { font-size: 1.25rem; font-weight: 600; margin-bottom: 10px; }
.service-card p { font-size: 0.9375rem; color: var(--c-text-2); line-height: 1.9; margin-bottom: 16px; }
.service-card .sc-tag { display: inline-flex; align-items: center; background: var(--c-primary-soft); color: var(--c-primary); font-size: 0.8125rem; font-weight: 600; padding: 4px 14px; border-radius: var(--radius-badge); margin-bottom: 18px; align-self: flex-start; }
.service-card .sc-link { display: inline-flex; align-items: center; gap: 6px; font-size: 0.9rem; font-weight: 600; color: var(--c-primary); transition: gap 0.3s ease; }
.service-card .sc-link:hover { gap: 10px; }
.service-card.wide { flex-direction: row; align-items: center; gap: 2rem; }
.service-card.wide .sc-body { flex: 1; }
.service-card.wide .sc-icon { margin-bottom: 0; flex-shrink: 0; }
.service-card.wide p { max-width: 640px; }
.service-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; }
@media (max-width: 1023px) {
  .service-card.wide { flex-direction: column; align-items: flex-start; }
  .service-card.wide .sc-icon { margin-bottom: 16px; }
}
@media (max-width: 767px) {
  .service-pair { grid-template-columns: 1fr; }
}

/* ===== Split Section ===== */
.split-section { padding: var(--space-section) 0; background: var(--c-bg-alt); }
.split-grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2rem, 4vw, 4rem); align-items: center; }
.split-media { position: relative; border-radius: var(--radius-card); overflow: hidden; box-shadow: var(--shadow-hover); }
.split-media img { width: 100%; height: 100%; object-fit: cover; aspect-ratio: 4/3; }
.split-media::after { content: ''; position: absolute; inset: 0; background: rgba(20,86,90,0.04); pointer-events: none; }
.split-content h2 { font-size: clamp(1.5rem, 2.6vw, 2.25rem); font-weight: 700; line-height: 1.35; margin-bottom: 20px; }
.split-content > p { font-size: 0.9375rem; line-height: 1.9; color: var(--c-text-2); margin-bottom: 28px; }
.split-list { list-style: none; margin-bottom: 32px; }
.split-list li { display: flex; align-items: center; gap: 12px; font-size: 0.9375rem; font-weight: 500; color: var(--c-ink); padding: 10px 0; border-bottom: 1px solid rgba(220,226,224,0.6); }
.split-list li::before { content: ''; width: 6px; height: 6px; border-radius: 50%; background: var(--c-accent); flex-shrink: 0; }
.btn-primary { display: inline-flex; align-items: center; gap: 8px; background: var(--c-primary); color: #fff; font-size: 0.9375rem; font-weight: 600; padding: 12px 28px; border-radius: var(--radius-btn); transition: all 0.3s ease; box-shadow: 0 4px 12px rgba(20,86,90,0.22); }
.btn-primary:hover { background: var(--c-primary-deep); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(20,86,90,0.32); }
.btn-primary .arrow { display: inline-block; transition: transform 0.3s ease; }
.btn-primary:hover .arrow { transform: translateX(4px); }
@media (max-width: 1023px) {
  .split-grid { grid-template-columns: 1fr; }
  .split-media img { aspect-ratio: 16/10; }
}

/* ===== Stats Bar ===== */
.stats-bar { background: var(--c-primary); color: #fff; padding: 56px 0; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 2rem; }
.stat-item { text-align: center; }
.stat-num { font-size: clamp(2.5rem, 6vw, 4rem); font-weight: 800; font-variant-numeric: tabular-nums; line-height: 1.2; color: #fff; }
.stat-item .stat-suffix { font-size: 1.25rem; font-weight: 600; vertical-align: baseline; color: rgba(255,255,255,0.8); }
.stat-label { font-size: 0.875rem; color: rgba(255,255,255,0.72); margin-top: 6px; }
@media (max-width: 1023px) {
  .stats-grid { grid-template-columns: repeat(2, 1fr); row-gap: 2.5rem; }
}

/* ===== FAQ ===== */
.faq-section { padding: var(--space-section) 0; }
.faq-section .container { max-width: 860px; }
.faq-section h2 { font-size: clamp(1.5rem, 2.6vw, 2.25rem); font-weight: 700; margin-bottom: 40px; text-align: center; }
.faq-item { border-bottom: 1px solid var(--c-border); }
.faq-item:first-child { border-top: 1px solid var(--c-border); }
.faq-q { display: flex; justify-content: space-between; align-items: center; padding: 20px 4px; font-size: 1rem; font-weight: 600; color: var(--c-ink); cursor: pointer; transition: color 0.3s ease; }
.faq-q:hover { color: var(--c-primary); }
.faq-q .faq-icon { width: 28px; height: 28px; flex-shrink: 0; border-radius: 50%; background: var(--c-primary-soft); color: var(--c-primary); display: flex; align-items: center; justify-content: center; font-size: 1rem; font-weight: 400; transition: transform 0.35s ease, background 0.35s ease, color 0.35s ease; }
.faq-item.open .faq-q { color: var(--c-primary); }
.faq-item.open .faq-icon { transform: rotate(45deg); background: var(--c-primary); color: #fff; }
.faq-a { max-height: 0; overflow: hidden; transition: max-height 0.45s cubic-bezier(0.4, 0, 0.2, 1), padding 0.35s ease; padding: 0 4px; }
.faq-item.open .faq-a { max-height: 300px; padding: 0 4px 24px; }
.faq-a p { font-size: 0.9375rem; color: var(--c-text-2); line-height: 1.95; }

/* ===== CTA Banner ===== */
.cta-banner { padding: 0 0 var(--space-section); }
.cta-inner { position: relative; background: var(--c-bg-alt); border: 1px solid var(--c-border); border-radius: 16px; padding: 56px 48px; display: flex; align-items: center; justify-content: space-between; gap: 32px; overflow: hidden; }
.cta-inner::before { content: ''; position: absolute; bottom: -40%; right: -10%; width: 380px; height: 220px; border-radius: 50%; background: rgba(20,86,90,0.06); filter: blur(48px); pointer-events: none; }
.cta-inner h2 { font-size: clamp(1.5rem, 3vw, 2.25rem); font-weight: 700; line-height: 1.3; max-width: 560px; }
.cta-inner p { margin-top: 10px; font-size: 0.9375rem; color: var(--c-text-2); max-width: 460px; }
.cta-inner .cta-actions { flex-shrink: 0; display: flex; gap: 14px; flex-wrap: wrap; position: relative; z-index: 1; }
.btn-outline { display: inline-flex; align-items: center; gap: 8px; border: 1.5px solid var(--c-primary); color: var(--c-primary); background: transparent; font-size: 0.9375rem; font-weight: 600; padding: 10px 24px; border-radius: var(--radius-btn); transition: all 0.3s ease; }
.btn-outline:hover { background: var(--c-primary); color: #fff; transform: translateY(-2px); box-shadow: 0 8px 20px rgba(20,86,90,0.22); }
@media (max-width: 767px) {
  .cta-inner { flex-direction: column; align-items: flex-start; padding: 40px 24px; }
}

/* ===== Footer ===== */
.site-footer { background: var(--c-primary-deep); color: rgba(255,255,255,0.82); padding: 72px 0 0; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 0.8fr 0.8fr 1fr; gap: 48px; padding-bottom: 48px; }
.footer-brand .logo-text { color: #fff; font-size: 1.375rem; }
.footer-brand .logo-sub { color: rgba(255,255,255,0.6); font-size: 0.75rem; font-weight: 600; margin-left: 8px; }
.footer-brand p { margin-top: 16px; font-size: 0.875rem; line-height: 1.9; color: rgba(255,255,255,0.66); max-width: 300px; }
.footer-col h4 { font-size: 0.9375rem; font-weight: 600; color: #fff; margin-bottom: 18px; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a { font-size: 0.875rem; color: rgba(255,255,255,0.66); transition: color 0.25s ease, padding-left 0.25s ease; }
.footer-col ul li a:hover { color: #fff; padding-left: 6px; }
.footer-contact li { display: flex; align-items: center; gap: 10px; font-size: 0.875rem; color: rgba(255,255,255,0.66); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.12); padding: 22px 0; display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.footer-bottom p { font-size: 0.8125rem; color: rgba(255,255,255,0.5); }
.footer-links a { font-size: 0.8125rem; color: rgba(255,255,255,0.5); margin-left: 20px; transition: color 0.25s ease; }
.footer-links a:hover { color: #fff; }
@media (max-width: 1023px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}
@media (max-width: 639px) {
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .footer-links a { margin: 0 10px; }
}

/* ===== Modal ===== */
.modal-overlay { position: fixed; inset: 0; z-index: 1000; background: rgba(15,25,25,0.5); backdrop-filter: blur(4px); -webkit-backdrop-filter: blur(4px); display: none; align-items: center; justify-content: center; padding: 20px; }
.modal-overlay.show { display: flex; animation: fadeIn 0.3s ease; }
.modal-box { background: var(--c-surface); width: 100%; max-width: 480px; border-radius: var(--radius-card); padding: 2rem; box-shadow: var(--shadow-modal); position: relative; animation: slideUp 0.35s ease; }
.modal-box .modal-close { position: absolute; top: 16px; right: 16px; width: 32px; height: 32px; border-radius: 50%; background: var(--c-bg); color: var(--c-text-2); font-size: 1.125rem; display: flex; align-items: center; justify-content: center; transition: all 0.3s ease; }
.modal-box .modal-close:hover { background: var(--c-primary-soft); color: var(--c-primary); transform: rotate(90deg); }
.modal-box h3 { font-size: 1.25rem; font-weight: 700; margin-bottom: 6px; }
.modal-box .modal-sub { font-size: 0.875rem; color: var(--c-text-2); margin-bottom: 24px; }
.modal-form .form-group { margin-bottom: 16px; }
.modal-form label { display: block; font-size: 0.8125rem; font-weight: 500; color: var(--c-ink); margin-bottom: 6px; }
.modal-form input, .modal-form textarea { width: 100%; padding: 10px 14px; border: 1px solid var(--c-border); border-radius: var(--radius-input); font-size: 0.9375rem; background: var(--c-bg); transition: border-color 0.25s ease, box-shadow 0.25s ease; }
.modal-form input:focus, .modal-form textarea:focus { border-color: var(--c-primary); box-shadow: 0 0 0 3px rgba(20,86,90,0.12); background: #fff; }
.modal-form input.invalid, .modal-form textarea.invalid { border-color: var(--c-error); }
.modal-form .error-msg { display: none; font-size: 0.75rem; color: var(--c-error); margin-top: 4px; }
.modal-form .form-group.invalid .error-msg { display: block; }
.modal-form textarea { min-height: 88px; resize: vertical; }
.modal-form .btn-submit { width: 100%; background: var(--c-primary); color: #fff; font-size: 0.9375rem; font-weight: 600; padding: 13px 24px; border-radius: var(--radius-btn); transition: all 0.3s ease; margin-top: 8px; }
.modal-form .btn-submit:hover { background: var(--c-primary-deep); box-shadow: 0 8px 20px rgba(20,86,90,0.3); }
.modal-privacy { margin-top: 14px; font-size: 0.75rem; color: var(--c-text-2); text-align: center; line-height: 1.7; }
.modal-success { display: none; text-align: center; padding: 24px 0; }
.modal-success.show { display: block; animation: fadeIn 0.4s ease; }
.modal-success .success-icon { width: 56px; height: 56px; border-radius: 50%; background: var(--c-primary-soft); color: var(--c-success); display: flex; align-items: center; justify-content: center; margin: 0 auto 20px; }
.modal-success .success-icon svg { width: 28px; height: 28px; stroke: currentColor; fill: none; stroke-width: 2; }
.modal-success p { font-size: 1rem; font-weight: 600; color: var(--c-ink); }
.modal-success span { font-size: 0.875rem; color: var(--c-text-2); display: block; margin-top: 6px; }
@media (max-width: 480px) {
  .modal-box { padding: 1.5rem; }
}
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideUp { from { opacity: 0; transform: translateY(24px); } to { opacity: 1; transform: translateY(0); } }

/* ===== Reveal Animations ===== */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .modal-overlay, .modal-box, .btn-primary, .btn-outline, .nav-cta { animation: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
}

/* roulang page: article */
/* ===== Design Tokens ===== */
:root {
  --c-bg: #F5F2ED;
  --c-bg-alt: #EAEFEC;
  --c-surface: #FFFFFF;
  --c-primary: #14565A;
  --c-primary-deep: #0C3F42;
  --c-primary-soft: #DDE9E6;
  --c-accent: #C08A4E;
  --c-ink: #1F2626;
  --c-text-2: #5D6866;
  --c-text-3: #8A9492;
  --c-border: #DCE2E0;
  --c-success: #2E7D52;
  --c-error: #B84A4A;
  --c-disabled: #B9C0BF;
  --radius-md: 12px;
  --radius-sm: 8px;
  --radius-round: 999px;
  --shadow-sm: 0 1px 2px rgba(31,38,38,0.04);
  --shadow-md: 0 16px 40px -12px rgba(31,38,38,0.18);
  --shadow-lg: 0 24px 64px -16px rgba(31,38,38,0.28);
  --container-w: 1280px;
  --font-cn: "HarmonyOS Sans SC", "MiSans", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --header-h: 72px;
}

/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-cn);
  background: var(--c-bg);
  color: var(--c-ink);
  line-height: 1.75;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; border: none; background: none; cursor: pointer; }
input, textarea, select { font-family: inherit; font-size: 1rem; }
ul, ol { list-style-position: outside; }
:focus-visible { outline: 2px solid var(--c-primary); outline-offset: 2px; }

.container {
  width: 100%;
  max-width: var(--container-w);
  margin: 0 auto;
  padding-left: clamp(1.25rem, 4vw, 4rem);
  padding-right: clamp(1.25rem, 4vw, 4rem);
}

/* ===== Buttons ===== */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: var(--c-primary);
  color: #FFFFFF;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  padding: 0.75rem 1.5rem;
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1;
  box-shadow: var(--shadow-sm);
  transition: background 0.25s, transform 0.25s, box-shadow 0.25s, border-color 0.25s;
}
.btn-primary:hover {
  background: var(--c-primary-deep);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.btn-primary:hover .arrow { transform: translateX(4px); }
.btn-primary:active { transform: translateY(0); }
.btn-primary .arrow { display: inline-block; transition: transform 0.25s; }
.btn-primary:disabled { opacity: 0.5; pointer-events: none; }

.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: transparent;
  color: var(--c-primary);
  border: 1.5px solid var(--c-primary);
  border-radius: var(--radius-sm);
  padding: 0.625rem 1.375rem;
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1;
  transition: background 0.25s, color 0.25s, transform 0.25s, box-shadow 0.25s;
}
.btn-ghost:hover {
  background: var(--c-primary-soft);
  color: var(--c-primary-deep);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}
.btn-ghost:active { transform: translateY(0); }

/* ===== Header & Nav ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(245, 242, 237, 0.92);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--c-border);
  transition: box-shadow 0.3s;
}
.site-header.scrolled { box-shadow: 0 6px 24px rgba(31, 38, 38, 0.07); }
.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
}

.logo {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  line-height: 1.2;
  flex-shrink: 0;
}
.logo-text {
  font-size: 1.3rem;
  font-weight: 800;
  letter-spacing: 0.01em;
  color: var(--c-primary);
}
.logo-sub {
  font-size: 0.6875rem;
  color: var(--c-text-2);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-top: 2px;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: clamp(1.25rem, 2.5vw, 2.5rem);
}
.main-nav a {
  position: relative;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--c-text-2);
  padding: 6px 0;
  transition: color 0.25s;
}
.main-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 100%;
  height: 2px;
  background: var(--c-primary);
  border-radius: 2px;
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
.main-nav a:hover { color: var(--c-primary); }
.main-nav a:hover::after { transform: scaleX(1); }
.main-nav a.active { color: var(--c-primary); font-weight: 600; }
.main-nav a.active::after { transform: scaleX(1); }

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  background: var(--c-primary);
  color: #FFFFFF;
  border-radius: var(--radius-sm);
  padding: 0.625rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 600;
  line-height: 1;
  box-shadow: var(--shadow-sm);
  transition: background 0.25s, transform 0.25s, box-shadow 0.25s;
}
.nav-cta:hover {
  background: var(--c-primary-deep);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}
.nav-cta .arrow { display: inline-block; transition: transform 0.25s; }
.nav-cta:hover .arrow { transform: translateX(3px); }

/* ===== Reading Progress ===== */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  width: 0;
  background: linear-gradient(90deg, var(--c-primary), var(--c-accent));
  z-index: 999;
  border-radius: 0 2px 2px 0;
}

/* ===== Breadcrumb ===== */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  max-width: 760px;
  margin: 0 auto 2rem;
  font-size: 0.875rem;
  color: var(--c-text-2);
}
.breadcrumb a { color: var(--c-text-2); transition: color 0.2s; }
.breadcrumb a:hover { color: var(--c-primary); }
.breadcrumb .sep { color: var(--c-border); }
.breadcrumb .current { color: var(--c-text-3); overflow: hidden; white-space: nowrap; text-overflow: ellipsis; max-width: 45vw; }

/* ===== Article Layout ===== */
.article-page {
  flex: 1 1 auto;
  padding: clamp(2.5rem, 6vw, 5rem) 0 clamp(3rem, 8vw, 6rem);
}

.article-head {
  max-width: 760px;
  margin: 0 auto 2rem;
}
.article-title {
  font-size: clamp(1.9rem, 4.5vw, 3.25rem);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.015em;
  margin-bottom: 1.5rem;
  color: var(--c-ink);
  overflow-wrap: break-word;
}
.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.875rem 1.5rem;
  font-size: 0.875rem;
  color: var(--c-text-2);
}
.meta-item {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
}
.meta-item svg { width: 15px; height: 15px; color: var(--c-text-3); }
.meta-cat {
  background: var(--c-primary-soft);
  color: var(--c-primary);
  padding: 0.2rem 0.75rem;
  border-radius: var(--radius-round);
  font-size: 0.8125rem;
  font-weight: 600;
}
.article-summary {
  max-width: 760px;
  margin: 0 auto 2.25rem;
  padding: 1.25rem 1.5rem;
  background: var(--c-bg-alt);
  border-left: 3px solid var(--c-primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--c-text-2);
  font-size: 0.9375rem;
  line-height: 1.85;
}
.article-summary strong { color: var(--c-ink); font-weight: 600; }

.article-cover {
  max-width: 980px;
  margin: 0 auto 3rem;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.article-cover img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

/* ===== Article Body Prose ===== */
.article-body {
  max-width: 760px;
  margin: 0 auto;
  font-size: 1.0625rem;
  line-height: 2.05;
  color: var(--c-ink);
}
.article-body > * + * { margin-top: 1.5rem; }
.article-body > p { line-height: 2; }
.article-body h2 {
  font-size: 1.625rem;
  font-weight: 700;
  line-height: 1.4;
  margin: 2.5em 0 1em;
  padding-top: 1.25em;
  border-top: 1px solid var(--c-border);
  color: var(--c-ink);
}
.article-body h3 {
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1.5;
  margin: 2em 0 0.75em;
  color: var(--c-ink);
}
.article-body h4 {
  font-size: 1.0625rem;
  font-weight: 600;
  margin: 1.75em 0 0.5em;
}
.article-body img {
  width: 100%;
  border-radius: var(--radius-md);
  margin: 2.5rem 0;
  box-shadow: var(--shadow-sm);
}
.article-body blockquote {
  border-left: 3px solid var(--c-primary);
  background: var(--c-primary-soft);
  padding: 1.25rem 1.5rem;
  margin: 2rem 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--c-text-2);
  font-size: 0.9375rem;
}
.article-body ul,
.article-body ol {
  margin: 1.5rem 0;
  padding-left: 1.375rem;
}
.article-body li {
  margin-bottom: 0.625rem;
  line-height: 1.9;
}
.article-body li::marker { color: var(--c-primary); }
.article-body pre {
  background: var(--c-ink);
  color: #E8EEEC;
  padding: 1.375rem 1.5rem;
  border-radius: var(--radius-md);
  overflow-x: auto;
  font-size: 0.875rem;
  line-height: 1.75;
  margin: 2rem 0;
}
.article-body code {
  background: var(--c-primary-soft);
  color: var(--c-primary-deep);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  font-size: 0.875em;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}
.article-body pre code {
  background: none;
  color: inherit;
  padding: 0;
  font-size: 0.875rem;
}
.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
  font-size: 0.9375rem;
  line-height: 1.7;
}
.article-body th,
.article-body td {
  border: 1px solid var(--c-border);
  padding: 0.75rem 1rem;
  text-align: left;
  vertical-align: top;
}
.article-body th {
  background: var(--c-bg-alt);
  font-weight: 600;
  color: var(--c-ink);
}
.article-body a {
  color: var(--c-primary);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-color: rgba(20, 86, 90, 0.4);
  transition: text-decoration-color 0.2s;
}
.article-body a:hover { text-decoration-color: var(--c-primary); }

/* ===== Article Bottom ===== */
.article-bottom {
  max-width: 760px;
  margin: 3rem auto 0;
  padding-top: 2rem;
  border-top: 1px solid var(--c-border);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}
.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  background: var(--c-primary-soft);
  color: var(--c-primary);
  font-size: 0.8125rem;
  font-weight: 500;
  padding: 0.3rem 0.875rem;
  border-radius: var(--radius-round);
  transition: background 0.25s;
}
.tag:hover { background: var(--c-primary); color: #FFFFFF; }
.share-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.share-label {
  font-size: 0.8125rem;
  color: var(--c-text-3);
  margin-right: 0.25rem;
}
.share-btn {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-round);
  border: 1px solid var(--c-border);
  background: var(--c-surface);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--c-text-2);
  font-size: 0.875rem;
  transition: border-color 0.25s, color 0.25s, background 0.25s, transform 0.25s;
}
.share-btn:hover {
  border-color: var(--c-primary);
  color: var(--c-primary);
  background: var(--c-primary-soft);
  transform: translateY(-2px);
}

/* ===== Related Posts ===== */
.related-section {
  background: var(--c-bg-alt);
  border-top: 1px solid var(--c-border);
  padding: clamp(3rem, 7vw, 5rem) 0;
  margin-top: clamp(3rem, 8vw, 5rem);
}
.related-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2.25rem;
}
.section-title {
  font-size: clamp(1.375rem, 2.4vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--c-ink);
  margin-bottom: 0;
}
.section-sub {
  font-size: 0.875rem;
  color: var(--c-text-2);
}
.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(1.25rem, 2.5vw, 2rem);
}
.related-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: transform 0.35s ease, box-shadow 0.35s ease, border-color 0.35s;
}
.related-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--c-primary);
}
.related-card-cover {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--c-bg-alt);
}
.related-card-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}
.related-card:hover .related-card-cover img { transform: scale(1.04); }
.related-card-body { padding: 1.5rem; }
.related-card-body .cat {
  display: inline-block;
  background: var(--c-primary-soft);
  color: var(--c-primary);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.2rem 0.625rem;
  border-radius: var(--radius-round);
  margin-bottom: 0.75rem;
}
.related-card-body h3 {
  font-size: 1.0625rem;
  font-weight: 600;
  line-height: 1.55;
  margin-bottom: 0.5rem;
  color: var(--c-ink);
  transition: color 0.25s;
}
.related-card:hover .related-card-body h3 { color: var(--c-primary); }
.related-card-body p {
  font-size: 0.8125rem;
  color: var(--c-text-2);
  line-height: 1.75;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.back-row {
  max-width: 760px;
  margin: 2.5rem auto 0;
  text-align: center;
}

/* ===== Not Found ===== */
.not-found {
  max-width: 640px;
  margin: 0 auto;
  text-align: center;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  padding: clamp(3rem, 8vw, 5rem) 2rem;
  box-shadow: var(--shadow-sm);
}
.not-found-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 1.5rem;
  border-radius: var(--radius-round);
  background: var(--c-bg-alt);
  color: var(--c-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  font-weight: 300;
}
.not-found h1 {
  font-size: 1.625rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--c-ink);
}
.not-found p {
  color: var(--c-text-2);
  font-size: 0.9375rem;
  margin-bottom: 2rem;
}

/* ===== Footer ===== */
.site-footer {
  background: var(--c-primary-deep);
  color: rgba(255, 255, 255, 0.72);
  padding: clamp(3rem, 7vw, 5rem) 0 1.5rem;
  flex-shrink: 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 0.9fr 1fr 1.2fr;
  gap: clamp(1.5rem, 4vw, 3rem);
  margin-bottom: 3rem;
}
.footer-brand .logo-text { color: #FFFFFF; }
.footer-brand .logo-sub { color: rgba(255, 255, 255, 0.55); }
.footer-brand p {
  margin-top: 1.25rem;
  max-width: 260px;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.6);
}
.footer-col h4 {
  color: #FFFFFF;
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
  letter-spacing: 0.02em;
}
.footer-col ul { list-style: none; }
.footer-col li {
  margin-bottom: 0.625rem;
  font-size: 0.875rem;
  line-height: 1.6;
}
.footer-col a {
  color: rgba(255, 255, 255, 0.6);
  transition: color 0.25s, padding-left 0.25s;
}
.footer-col a:hover {
  color: #FFFFFF;
  padding-left: 4px;
}
.footer-contact li {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  color: rgba(255, 255, 255, 0.6);
}
.footer-contact li span { color: var(--c-accent); font-size: 0.9375rem; }
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding-top: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.4);
}
.footer-links { display: flex; align-items: center; gap: 1.25rem; }
.footer-links a {
  color: rgba(255, 255, 255, 0.4);
  transition: color 0.25s;
}
.footer-links a:hover { color: #FFFFFF; }

/* ===== Mobile Tabbar ===== */
.mobile-tabbar {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 64px;
  background: rgba(255, 255, 255, 0.9);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  border-top: 1px solid var(--c-border);
  z-index: 1000;
  box-shadow: 0 -4px 20px rgba(31, 38, 38, 0.04);
}
.tabbar-inner {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  height: 100%;
}
.tab-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  font-size: 0.625rem;
  letter-spacing: 0.02em;
  color: var(--c-text-2);
  position: relative;
  transition: color 0.2s;
  -webkit-tap-highlight-color: transparent;
}
.tab-item svg {
  width: 22px;
  height: 22px;
}
.tab-item.active { color: var(--c-primary); }
.tab-item.active::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 22px;
  height: 3px;
  border-radius: 0 0 4px 4px;
  background: var(--c-primary);
}

/* ===== Modal ===== */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(15, 25, 25, 0.5);
  -webkit-backdrop-filter: blur(4px);
  backdrop-filter: blur(4px);
  z-index: 2000;
  align-items: center;
  justify-content: center;
  padding: 1.25rem;
}
.modal-overlay.active { display: flex; }
.modal-dialog {
  background: var(--c-surface);
  border-radius: var(--radius-md);
  width: 480px;
  max-width: 100%;
  padding: clamp(1.5rem, 4vw, 2rem);
  box-shadow: var(--shadow-lg);
  animation: modalIn 0.3s ease;
  max-height: calc(100vh - 2.5rem);
  overflow-y: auto;
}
@keyframes modalIn {
  from { opacity: 0; transform: translateY(20px) scale(0.98); }
  to { opacity: 1; transform: none; }
}
.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}
.modal-header h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--c-ink);
}
.modal-close {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--c-bg);
  color: var(--c-text-2);
  font-size: 1.25rem;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.25s, color 0.25s;
}
.modal-close:hover { background: var(--c-primary-soft); color: var(--c-primary); }

.form-group { margin-bottom: 1rem; }
.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--c-ink);
  margin-bottom: 0.375rem;
}
.form-group input,
.form-group textarea {
  width: 100%;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  background: var(--c-bg);
  color: var(--c-ink);
  font-size: 0.9375rem;
  transition: border-color 0.25s, box-shadow 0.25s, background 0.25s;
}
.form-group textarea { resize: vertical; min-height: 84px; }
.form-group input:hover,
.form-group textarea:hover { border-color: var(--c-text-3); }
.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--c-primary);
  box-shadow: 0 0 0 3px rgba(20, 86, 90, 0.12);
  background: var(--c-surface);
}
.form-group .error-text {
  display: none;
  font-size: 0.8125rem;
  color: var(--c-error);
  margin-top: 0.25rem;
}
.form-group.invalid input,
.form-group.invalid textarea {
  border-color: var(--c-error);
}
.form-group.invalid .error-text { display: block; }

.form-submit { width: 100%; justify-content: center; padding: 0.875rem 1.5rem; }
.form-privacy {
  font-size: 0.8125rem;
  color: var(--c-text-2);
  text-align: center;
  margin-top: 1rem;
  line-height: 1.6;
}
.form-privacy a {
  color: var(--c-primary);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.form-success {
  display: none;
  text-align: center;
  padding: 2.5rem 1rem;
}
.form-success.show { display: block; }
.success-icon {
  width: 60px;
  height: 60px;
  margin: 0 auto 1.25rem;
  border-radius: var(--radius-round);
  background: var(--c-primary-soft);
  color: var(--c-success);
  display: flex;
  align-items: center;
  justify-content: center;
}
.success-icon svg { width: 30px; height: 30px; }
.success-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--c-ink);
  margin-bottom: 0.5rem;
}
.success-desc {
  font-size: 0.875rem;
  color: var(--c-text-2);
  line-height: 1.7;
}

/* ===== Reveal Animations ===== */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.in-view {
  opacity: 1;
  transform: none;
}
.reveal-d1 { transition-delay: 0.1s; }
.reveal-d2 { transition-delay: 0.2s; }
.reveal-d3 { transition-delay: 0.3s; }

/* ===== Responsive ===== */
@media (max-width: 1023px) {
  .main-nav { gap: 1rem; }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }
  .related-grid { gap: 1.25rem; }
}

@media (max-width: 767px) {
  .main-nav { display: none; }
  .site-header .nav-wrapper { justify-content: space-between; }
  .nav-cta { font-size: 0.8125rem; padding: 0.5rem 1rem; }
  body { padding-bottom: 64px; }
  .mobile-tabbar { display: block; }

  .article-page { padding-top: 2rem; }
  .breadcrumb { margin-bottom: 1.5rem; }
  .article-title { font-size: clamp(1.5rem, 6vw, 2.25rem); }
  .article-meta { gap: 0.625rem 1rem; font-size: 0.8125rem; }
  .article-summary { padding: 1rem 1.25rem; font-size: 0.875rem; }
  .article-cover { margin-bottom: 2rem; }
  .article-body { font-size: 1rem; line-height: 2; }
  .article-body h2 { font-size: 1.375rem; }

  .related-grid { grid-template-columns: 1fr; }
  .back-row { margin-top: 2rem; }

  .footer-grid { grid-template-columns: 1fr; gap: 2rem; }
  .footer-bottom { flex-direction: column; align-items: flex-start; gap: 0.75rem; }
  .footer-links { gap: 1rem; }

  .article-bottom { flex-direction: column; align-items: flex-start; gap: 1.25rem; }
  .share-actions { align-self: flex-start; }
}

@media (max-width: 480px) {
  .nav-cta span:not(.arrow) { display: none; }
  .nav-cta .arrow { font-size: 1rem; }
  .article-summary { border-left-width: 2px; }
  .related-card-body { padding: 1.25rem; }
}

/* ===== Reduced Motion ===== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
  }
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; }
}

/* roulang page: category2 */
:root{
  --c-bg:#F5F2ED;
  --c-bg-alt:#EAEFEC;
  --c-surface:#FFFFFF;
  --c-primary:#14565A;
  --c-primary-deep:#0C3F42;
  --c-primary-soft:#DDE9E6;
  --c-accent:#C08A4E;
  --c-ink:#1F2626;
  --c-text-2:#5D6866;
  --c-border:#DCE2E0;
  --c-success:#2E7D52;
  --c-error:#B84A4A;
  --c-disabled:#B9C0BF;
  --radius-lg:12px;
  --radius-md:8px;
  --shadow-sm:0 1px 2px rgba(31,38,38,.04);
  --shadow-hover:0 16px 40px -12px rgba(31,38,38,.18);
  --shadow-modal:0 24px 64px -16px rgba(31,38,38,.28);
  --container:1280px;
  --space-section:clamp(4rem,9vw,7rem);
  --font-stack:HarmonyOS Sans SC, MiSans, PingFang SC, Microsoft YaHei, Helvetica Neue, Arial, sans-serif;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--font-stack);
  background:var(--c-bg);
  color:var(--c-ink);
  line-height:1.8;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
button,input,textarea{font-family:inherit;font-size:1rem}
ul,ol{list-style:none}
.container{max-width:var(--container);margin:0 auto;padding:0 64px}
.site-header{
  position:sticky;top:0;z-index:100;
  background:rgba(245,242,237,.92);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--c-border);
  height:72px;
  transition:box-shadow .3s ease;
}
.site-header.scrolled{box-shadow:0 8px 30px -12px rgba(31,38,38,.12)}
.nav-wrapper{height:72px;display:flex;align-items:center;gap:48px}
.logo{display:flex;align-items:baseline;gap:8px;flex-shrink:0}
.logo-text{font-size:1.5rem;font-weight:800;letter-spacing:-0.02em;color:var(--c-primary)}
.logo-sub{font-size:.75rem;color:var(--c-text-2);border-left:1px solid var(--c-border);padding-left:10px;letter-spacing:.08em}
.main-nav{display:flex;align-items:center;gap:28px;margin-left:auto}
.main-nav a{
  font-size:.9375rem;font-weight:500;color:var(--c-text-2);
  padding:26px 0 22px;position:relative;transition:color .25s;
}
.main-nav a::after{
  content:"";position:absolute;left:0;bottom:16px;width:0;height:2px;
  background:var(--c-primary);transition:width .3s ease;border-radius:2px;
}
.main-nav a:hover{color:var(--c-primary)}
.main-nav a:hover::after{width:100%}
.main-nav a.active{color:var(--c-primary)}
.main-nav a.active::after{width:100%}
.nav-cta{
  display:inline-flex;align-items:center;gap:6px;
  background:var(--c-primary);color:#fff;
  border-radius:var(--radius-md);padding:10px 20px;
  font-size:.875rem;font-weight:600;
  box-shadow:var(--shadow-sm);
  transition:background .25s, transform .25s, box-shadow .25s;
}
.nav-cta:hover{background:var(--c-primary-deep);transform:translateY(-2px);box-shadow:var(--shadow-hover)}
.nav-cta .arrow{transition:transform .25s}
.nav-cta:hover .arrow{transform:translateX(4px)}
.mobile-tabs{
  display:none;position:fixed;left:0;right:0;bottom:0;z-index:120;
  height:64px;background:rgba(255,255,255,.92);
  backdrop-filter:blur(14px);border-top:1px solid var(--c-border);
  padding:0 8px;padding-bottom:env(safe-area-inset-bottom);
}
.mobile-tabs a{
  flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;
  color:var(--c-text-2);font-size:.625rem;
  position:relative;transition:color .2s;
}
.mobile-tabs a svg{width:20px;height:20px;stroke:currentColor;fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.mobile-tabs a.active{color:var(--c-primary);font-weight:600}
.mobile-tabs a.active::before{
  content:"";position:absolute;top:0;left:50%;transform:translateX(-50%);
  width:36px;height:3px;background:var(--c-primary);border-radius:0 0 3px 3px;
}
.page-hero{
  background:
    linear-gradient(180deg, rgba(245,242,237,.86) 0%, rgba(245,242,237,.96) 100%),
    url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
  padding:clamp(3.5rem,7vw,6rem) 0 clamp(2.5rem,5vw,4rem);
  border-bottom:1px solid var(--c-border);
}
.breadcrumb{
  display:flex;align-items:center;gap:8px;
  font-size:.8125rem;color:var(--c-text-2);margin-bottom:24px;
}
.breadcrumb a{transition:color .2s}
.breadcrumb a:hover{color:var(--c-primary)}
.breadcrumb .sep{color:var(--c-disabled)}
.page-hero h1{
  font-size:clamp(2rem,5vw,3.5rem);
  font-weight:800;line-height:1.15;letter-spacing:-0.01em;
  color:var(--c-ink);
}
.page-hero .hero-sub{
  max-width:640px;margin-top:16px;
  font-size:clamp(1rem,1.6vw,1.125rem);
  color:var(--c-text-2);line-height:1.9;
}
.solution-section{padding:var(--space-section) 0}
.section-head{max-width:720px;margin-bottom:48px}
.section-head .eyebrow{
  display:inline-block;font-size:.8125rem;font-weight:600;
  color:var(--c-primary);background:var(--c-primary-soft);
  padding:4px 14px;border-radius:999px;margin-bottom:16px;
}
.section-head h2{
  font-size:clamp(1.5rem,2.6vw,2.25rem);
  font-weight:700;line-height:1.25;letter-spacing:-0.02em;
}
.section-head p{color:var(--c-text-2);margin-top:12px;font-size:1rem}
.solution-list{
  border-top:1px solid var(--c-border);
}
.solution-row{
  display:grid;grid-template-columns:96px 1fr auto;gap:32px;align-items:center;
  padding:38px 8px;border-bottom:1px solid var(--c-border);
  transition:background .3s ease, padding-left .3s ease;
}
.solution-row:hover{background:rgba(255,255,255,.7);padding-left:20px}
.solution-row .num{
  font-size:clamp(3rem,8vw,5rem);font-weight:100;line-height:1;
  color:rgba(20,86,90,.3);
  font-variant-numeric:tabular-nums;
}
.solution-row .info h3{
  font-size:1.3125rem;font-weight:600;margin-bottom:8px;
  color:var(--c-ink);
}
.solution-row .info p{
  font-size:.9375rem;color:var(--c-text-2);max-width:680px;
  line-height:1.85;
}
.solution-row .tags{display:flex;gap:8px;margin-top:12px;flex-wrap:wrap}
.solution-row .tag{
  font-size:.75rem;font-weight:500;color:var(--c-primary);
  background:var(--c-primary-soft);padding:3px 12px;border-radius:999px;
}
.solution-row .more{
  display:inline-flex;align-items:center;gap:6px;
  font-size:.875rem;font-weight:600;color:var(--c-primary);
  white-space:nowrap;transition:gap .25s;
}
.solution-row .more:hover{gap:12px}
.process-section{
  background:var(--c-bg-alt);
  border-top:1px solid var(--c-border);
  border-bottom:1px solid var(--c-border);
  padding:var(--space-section) 0;
}
.process-grid{
  display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:40px;
}
.process-item{
  background:var(--c-surface);border-radius:var(--radius-lg);
  border:1px solid var(--c-border);padding:32px 28px;
  position:relative;transition:transform .3s ease, box-shadow .3s ease, border-color .3s ease;
}
.process-item:hover{
  transform:translateY(-4px);
  box-shadow:var(--shadow-hover);
  border-color:var(--c-primary);
}
.process-step{
  display:inline-flex;align-items:center;justify-content:center;
  width:36px;height:36px;border-radius:999px;
  background:var(--c-primary);color:#fff;
  font-size:.875rem;font-weight:700;margin-bottom:18px;
}
.process-item h3{font-size:1.125rem;font-weight:600;margin-bottom:10px}
.process-item p{font-size:.875rem;color:var(--c-text-2);line-height:1.75}
.split-section{padding:var(--space-section) 0}
.split-grid{
  display:grid;grid-template-columns:1fr 1fr;gap:clamp(2rem,5vw,5rem);align-items:center;
}
.split-grid .media{
  border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow-sm);
}
.split-grid .media img{
  width:100%;aspect-ratio:4/3;object-fit:cover;
  transition:transform .6s ease;
}
.split-grid .media:hover img{transform:scale(1.03)}
.split-content .eyebrow{
  display:inline-block;font-size:.8125rem;font-weight:600;
  color:var(--c-primary);background:var(--c-primary-soft);
  padding:4px 14px;border-radius:999px;margin-bottom:16px;
}
.split-content h2{
  font-size:clamp(1.5rem,2.6vw,2.25rem);
  font-weight:700;line-height:1.25;letter-spacing:-0.02em;
  margin-bottom:20px;
}
.split-content p{
  color:var(--c-text-2);font-size:1rem;line-height:1.9;margin-bottom:20px;
}
.split-points{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:28px}
.split-points span{
  font-size:.8125rem;font-weight:500;color:var(--c-primary);
  background:rgba(20,86,90,.06);
  border:1px solid rgba(20,86,90,.16);
  padding:6px 16px;border-radius:999px;
}
.btn{
  display:inline-flex;align-items:center;gap:8px;
  background:var(--c-primary);color:#fff;
  border:none;border-radius:var(--radius-md);
  padding:12px 28px;font-size:.9375rem;font-weight:600;
  cursor:pointer;box-shadow:var(--shadow-sm);
  transition:background .25s, transform .25s, box-shadow .25s;
}
.btn:hover{background:var(--c-primary-deep);transform:translateY(-2px);box-shadow:var(--shadow-hover)}
.btn .arrow{transition:transform .25s}
.btn:hover .arrow{transform:translateX(4px)}
.btn-ghost{
  background:transparent;color:var(--c-primary);
  border:1px solid var(--c-primary);
}
.btn-ghost:hover{background:rgba(20,86,90,.06);box-shadow:none}
.faq-section{padding:var(--space-section) 0;background:var(--c-bg)}
.faq-list{max-width:840px;margin:0 auto}
.faq-item{border-bottom:1px solid var(--c-border)}
.faq-item:first-child{border-top:1px solid var(--c-border)}
.faq-question{
  display:flex;align-items:center;justify-content:space-between;gap:20px;
  padding:24px 4px;cursor:pointer;
  font-size:1rem;font-weight:600;color:var(--c-ink);
  transition:color .2s;
}
.faq-question:hover{color:var(--c-primary)}
.faq-icon{
  flex-shrink:0;width:28px;height:28px;border-radius:999px;
  display:flex;align-items:center;justify-content:center;
  background:var(--c-primary-soft);color:var(--c-primary);
  font-size:1.125rem;font-weight:400;
  transition:transform .35s ease;
}
.faq-item.open .faq-icon{transform:rotate(45deg)}
.faq-answer{
  max-height:0;overflow:hidden;opacity:0;
  transition:max-height .35s ease, opacity .35s ease, padding .35s ease;
  padding:0 4px;
}
.faq-item.open .faq-answer{
  max-height:320px;opacity:1;padding:0 4px 24px;
}
.faq-answer p{
  color:var(--c-text-2);font-size:.9375rem;line-height:1.85;
}
.cta-section{padding:var(--space-section) 0}
.cta-banner{
  max-width:960px;margin:0 auto;
  background:var(--c-surface);
  border:1px solid var(--c-border);
  border-radius:var(--radius-lg);
  padding:clamp(2rem,5vw,4rem);
  text-align:center;position:relative;overflow:hidden;
  box-shadow:var(--shadow-sm);
}
.cta-banner::before{
  content:"";position:absolute;left:0;right:0;bottom:0;height:60px;
  background:url("data:image/svg+xml,%3Csvg width='600' height='60' viewBox='0 0 600 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M0 50C100 30 200 70 300 50C400 30 500 70 600 50V60H0V50Z' fill='%23DDE9E6' opacity='0.3'/%3E%3C/svg%3E") center/cover no-repeat;
  pointer-events:none;
}
.cta-banner h2{
  font-size:clamp(1.5rem,2.6vw,2.25rem);
  font-weight:700;letter-spacing:-0.02em;margin-bottom:12px;
}
.cta-banner p{
  color:var(--c-text-2);font-size:.9375rem;margin-bottom:28px;
}
.site-footer{
  background:var(--c-primary-deep);color:rgba(255,255,255,.78);
  padding:64px 0 32px;
}
.site-footer .logo-text{color:#fff}
.site-footer .logo-sub{color:rgba(255,255,255,.5);border-left-color:rgba(255,255,255,.2)}
.footer-grid{
  display:grid;grid-template-columns:2fr 1fr 1fr 1.2fr;gap:40px;
  padding-bottom:40px;border-bottom:1px solid rgba(255,255,255,.12);
}
.footer-brand p{font-size:.875rem;line-height:1.85;margin-top:16px;max-width:280px}
.footer-col h4{
  font-size:1rem;font-weight:600;color:#fff;margin-bottom:18px;
}
.footer-col ul li{margin-bottom:10px}
.footer-col ul a{
  font-size:.875rem;color:rgba(255,255,255,.7);
  transition:color .2s,padding-left .2s;
}
.footer-col ul a:hover{color:#fff;padding-left:4px}
.footer-contact li{font-size:.875rem;display:flex;gap:8px;align-items:center;color:rgba(255,255,255,.7)}
.footer-bottom{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  flex-wrap:wrap;padding-top:28px;
  font-size:.8125rem;color:rgba(255,255,255,.42);
}
.footer-links{display:flex;gap:20px}
.footer-links a{color:rgba(255,255,255,.42);transition:color .2s}
.footer-links a:hover{color:#fff}
.modal-overlay{
  position:fixed;inset:0;z-index:200;
  background:rgba(15,25,25,.5);
  backdrop-filter:blur(4px);
  display:flex;align-items:center;justify-content:center;
  padding:20px;opacity:0;visibility:hidden;
  transition:opacity .3s ease, visibility .3s ease;
}
.modal-overlay.show{opacity:1;visibility:visible}
.modal-card{
  background:var(--c-surface);
  border-radius:var(--radius-lg);
  box-shadow:var(--shadow-modal);
  width:480px;max-width:100%;
  padding:32px;position:relative;
  transform:translateY(16px);transition:transform .35s ease;
}
.modal-overlay.show .modal-card{transform:translateY(0)}
.modal-header{
  display:flex;align-items:center;justify-content:space-between;
  margin-bottom:24px;
}
.modal-header h3{font-size:1.25rem;font-weight:600}
.modal-close{
  width:32px;height:32px;border:none;background:var(--c-bg-alt);
  border-radius:999px;cursor:pointer;font-size:1rem;color:var(--c-ink);
  display:flex;align-items:center;justify-content:center;
  transition:background .2s,color .2s;
}
.modal-close:hover{background:var(--c-primary);color:#fff}
.form-group{margin-bottom:18px}
.form-group label{display:block;font-size:.8125rem;font-weight:600;color:var(--c-ink);margin-bottom:6px}
.form-group input,.form-group textarea{
  width:100%;padding:10px 14px;
  border:1px solid var(--c-border);border-radius:var(--radius-md);
  font-size:.9375rem;background:#fff;color:var(--c-ink);
  transition:border-color .2s, box-shadow .2s;
}
.form-group input:focus,.form-group textarea:focus{
  outline:none;border-color:var(--c-primary);
  box-shadow:0 0 0 3px rgba(20,86,90,.12);
}
.form-group input.error,.form-group textarea.error{
  border-color:var(--c-error);
  box-shadow:0 0 0 3px rgba(184,74,74,.12);
}
.form-error{font-size:.75rem;color:var(--c-error);margin-top:4px;display:none}
.form-group.error .form-error{display:block}
.form-group textarea{resize:vertical;min-height:80px}
.modal-submit{
  width:100%;justify-content:center;margin-top:6px;
}
.privacy-tip{font-size:.75rem;color:var(--c-text-2);text-align:center;margin-top:14px}
.form-success{
  text-align:center;padding:32px 8px;display:none;
}
.form-success .ok-icon{
  width:64px;height:64px;border-radius:999px;
  background:var(--c-success);color:#fff;
  display:inline-flex;align-items:center;justify-content:center;
  font-size:2rem;margin-bottom:16px;
}
.form-success p{font-size:1rem;font-weight:600;color:var(--c-ink)}
.form-success span{font-size:.875rem;color:var(--c-text-2);display:block;margin-top:6px}
.reveal{
  opacity:0;transform:translateY(16px);
  transition:opacity .6s ease, transform .6s ease;
}
.reveal.visible{opacity:1;transform:translateY(0)}
@media (max-width:1023px){
  .container{padding:0 40px}
  .main-nav{display:none}
  .nav-wrapper{gap:24px}
  .nav-cta{margin-left:auto}
  .process-grid{grid-template-columns:repeat(2,1fr)}
  .split-grid{grid-template-columns:1fr;gap:28px}
  .solution-row{grid-template-columns:72px 1fr;gap:20px}
  .solution-row .more{grid-column:2}
}
@media (max-width:639px){
  .container{padding:0 20px}
  .site-header{height:64px}
  .nav-wrapper{height:64px}
  .logo-text{font-size:1.25rem}
  .logo-sub{display:none}
  .nav-cta{padding:8px 16px;font-size:.8125rem}
  .nav-cta .arrow{display:none}
  .mobile-tabs{display:flex}
  main{padding-bottom:96px}
  .page-hero{padding-top:3rem}
  .breadcrumb{font-size:.75rem}
  .solution-row{
    grid-template-columns:1fr;gap:12px;padding:28px 4px;
  }
  .solution-row .num{font-size:2.5rem}
  .solution-row .more{margin-top:4px}
  .process-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:32px}
  .footer-bottom{flex-direction:column;align-items:flex-start}
  .footer-links{flex-wrap:wrap}
  .cta-banner{padding:2rem 1.25rem}
  .modal-card{padding:24px}
}
@media (prefers-reduced-motion: reduce){
  *{animation:none !important;transition:none !important}
  .reveal{opacity:1;transform:none}
  html{scroll-behavior:auto}
}

/* roulang page: category3 */
/* ========== Design Variables ========== */
:root {
  --c-bg: #F5F2ED;
  --c-bg-alt: #EAEFEC;
  --c-surface: #FFFFFF;
  --c-primary: #14565A;
  --c-primary-deep: #0C3F42;
  --c-primary-soft: #DDE9E6;
  --c-accent: #C08A4E;
  --c-ink: #1F2626;
  --c-text-2: #5D6866;
  --c-border: #DCE2E0;
  --c-success: #2E7D52;
  --c-error: #B84A4A;
  --c-disabled: #B9C0BF;
  --radius-card: 12px;
  --radius-btn: 8px;
  --radius-input: 8px;
  --shadow-sm: 0 1px 2px rgba(31,38,38,0.04);
  --shadow-hover: 0 16px 40px -12px rgba(31,38,38,0.18);
  --shadow-modal: 0 24px 64px -16px rgba(31,38,38,0.28);
  --container: 1280px;
  --space: clamp(4rem, 9vw, 7rem);
  --font: "HarmonyOS Sans SC", "MiSans", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --fs-display: clamp(2.5rem, 6vw, 4rem);
  --fs-h1: clamp(2rem, 5vw, 3.5rem);
  --fs-h2: clamp(1.5rem, 2.6vw, 2.25rem);
  --fs-body: 1rem;
  --fs-small: 0.875rem;
}

/* ========== Reset & Base ========== */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  font-size: var(--fs-body);
  line-height: 1.8;
  background: var(--c-bg);
  color: var(--c-ink);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font-family: inherit; font-size: inherit; cursor: pointer; border: none; background: none; color: inherit; }
input, textarea, select { font-family: inherit; font-size: 1rem; }

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding-left: clamp(1.25rem, 4vw, 4rem);
  padding-right: clamp(1.25rem, 4vw, 4rem);
}

/* ========== Section Head ========== */
.section-head {
  max-width: 720px;
  margin-bottom: clamp(2.5rem, 5vw, 4rem);
}
.section-head .section-eyebrow {
  display: inline-block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--c-primary);
  letter-spacing: 0.12em;
  margin-bottom: 12px;
  padding: 4px 16px;
  background: var(--c-primary-soft);
  border-radius: 999px;
}
.section-head h2 {
  font-size: var(--fs-h2);
  line-height: 1.25;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 16px;
}
.section-head p {
  color: var(--c-text-2);
  font-size: 1rem;
  line-height: 1.9;
}

/* ========== Buttons ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-btn);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
  transition: all 0.25s ease;
  white-space: nowrap;
}
.btn .arrow { transition: transform 0.25s ease; }
.btn:hover .arrow { transform: translateX(4px); }
.btn-primary {
  background: var(--c-primary);
  color: #fff;
}
.btn-primary:hover {
  background: var(--c-primary-deep);
  box-shadow: 0 12px 28px -10px rgba(20,86,90,0.5);
  transform: translateY(-2px);
}
.btn-primary:active {
  transform: translateY(0);
  box-shadow: 0 6px 14px -8px rgba(20,86,90,0.5);
}
.btn-outline {
  background: transparent;
  border: 1px solid var(--c-primary);
  color: var(--c-primary);
}
.btn-outline:hover {
  background: var(--c-primary-soft);
}
.btn-light {
  background: #fff;
  color: var(--c-primary);
}
.btn-light:hover {
  background: rgba(255,255,255,0.9);
  box-shadow: 0 12px 28px -10px rgba(0,0,0,0.3);
  transform: translateY(-2px);
}
.btn-lg { padding: 16px 36px; font-size: 16px; }
.btn-block { width: 100%; }
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--c-primary);
  outline-offset: 2px;
}

/* ========== Header / Nav ========== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.92);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--c-border);
  transition: box-shadow 0.3s ease;
}
.site-header.scrolled { box-shadow: 0 4px 24px rgba(31,38,38,0.06); }
.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.logo {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  flex-shrink: 0;
}
.logo-text {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--c-primary);
  line-height: 1.2;
}
.logo-sub {
  font-size: 0.75rem;
  color: var(--c-text-2);
}
.main-nav { display: flex; gap: 28px; align-items: center; }
.main-nav a {
  position: relative;
  padding: 8px 2px;
  font-size: 15px;
  font-weight: 500;
  color: var(--c-ink);
  transition: color 0.2s ease;
}
.main-nav a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 2px;
  width: 100%;
  height: 2px;
  background: var(--c-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}
.main-nav a:hover,
.main-nav a.active { color: var(--c-primary); }
.main-nav a:hover::after,
.main-nav a.active::after { transform: scaleX(1); }
.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--c-primary);
  color: #fff;
  padding: 10px 22px;
  border-radius: var(--radius-btn);
  font-size: 14px;
  font-weight: 600;
  line-height: 1.2;
  transition: all 0.25s ease;
  flex-shrink: 0;
}
.nav-cta:hover {
  background: var(--c-primary-deep);
  box-shadow: 0 8px 20px -8px rgba(20,86,90,0.45);
  transform: translateY(-2px);
}
.nav-cta:active { transform: translateY(0); }

/* ========== Mobile Tab Bar ========== */
.mobile-tab-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: calc(64px + env(safe-area-inset-bottom));
  padding-bottom: env(safe-area-inset-bottom);
  background: rgba(255,255,255,0.95);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-top: 1px solid var(--c-border);
  display: none;
  z-index: 200;
}
.mobile-tab-bar .tab-item {
  position: relative;
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  font-size: 10px;
  color: var(--c-text-2);
  transition: color 0.2s ease;
}
.mobile-tab-bar .tab-item svg { width: 22px; height: 22px; stroke: currentColor; }
.mobile-tab-bar .tab-item.active { color: var(--c-primary); font-weight: 600; }
.mobile-tab-bar .tab-item.active::before {
  content: '';
  position: absolute;
  top: 0;
  width: 24px;
  height: 4px;
  border-radius: 0 0 4px 4px;
  background: var(--c-primary);
}

/* ========== Case Page Header ========== */
.case-page-header {
  padding: clamp(3.5rem, 8vw, 6rem) 0;
  background:
    linear-gradient(to bottom, rgba(245,242,237,0.85), rgba(245,242,237,0.97)),
    url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
  border-bottom: 1px solid var(--c-border);
  position: relative;
}
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  color: var(--c-text-2);
  margin-bottom: 28px;
}
.breadcrumb a { transition: color 0.2s ease; }
.breadcrumb a:hover { color: var(--c-primary); }
.breadcrumb .sep { color: var(--c-disabled); }
.case-page-header h1 {
  font-size: var(--fs-h1);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin-bottom: 16px;
  color: var(--c-ink);
}
.case-page-header .page-subtitle {
  max-width: 560px;
  font-size: 1.0625rem;
  color: var(--c-text-2);
  line-height: 1.9;
}

/* ========== Cases Section ========== */
.cases-section { padding: var(--space) 0; }
.cases-list .case-card { margin-bottom: clamp(2rem, 4vw, 3.5rem); }
.case-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.3s ease, transform 0.3s ease, border-color 0.3s ease;
}
.case-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
  border-color: var(--c-primary);
}
.case-media {
  overflow: hidden;
  position: relative;
  background: var(--c-primary-soft);
}
.case-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.case-card:hover .case-media img { transform: scale(1.03); }

/* full width card */
.case-card--full .case-media { aspect-ratio: 21 / 9; }
.case-card--full .case-body {
  padding: clamp(1.5rem, 3vw, 3rem);
}

/* split card */
.case-card--split {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
}
.case-card--split .case-media { min-height: 460px; }
.case-card--split .case-body {
  padding: clamp(1.5rem, 3vw, 3rem);
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.case-card--reverse .case-media { order: 2; }
.case-card--reverse .case-body { order: 1; }

/* case body content */
.case-tag {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--c-primary);
  background: var(--c-primary-soft);
  padding: 4px 14px;
  border-radius: 999px;
  margin-bottom: 16px;
}
.case-card h2 {
  font-size: clamp(1.25rem, 2.2vw, 1.75rem);
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -0.01em;
  margin-bottom: 14px;
}
.case-desc {
  color: var(--c-text-2);
  font-size: 0.9375rem;
  line-height: 1.9;
  margin-bottom: 24px;
}
.case-results {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  padding-top: 22px;
  border-top: 1px solid var(--c-border);
  margin-bottom: 24px;
}
.result-item {
  flex: 1;
  min-width: 120px;
  display: flex;
  flex-direction: column;
}
.result-num {
  font-size: clamp(1.5rem, 2.4vw, 2rem);
  font-weight: 800;
  color: var(--c-primary);
  font-variant-numeric: tabular-nums;
  line-height: 1.2;
}
.result-suffix {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--c-primary);
  margin-left: 2px;
}
.result-label {
  font-size: 0.8125rem;
  color: var(--c-text-2);
  margin-top: 4px;
}
.case-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--c-primary);
  transition: gap 0.25s ease;
}
.case-link:hover { gap: 12px; }
.case-link .arrow { transition: transform 0.25s ease; }
.case-link:hover .arrow { transform: translateX(2px); }

/* ========== Stats Band ========== */
.case-stats {
  background: var(--c-primary);
  color: #fff;
  padding: clamp(3rem, 6vw, 5rem) 0;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  text-align: center;
}
.stat-number {
  display: inline-flex;
  align-items: baseline;
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  line-height: 1.15;
}
.stat-suffix {
  font-size: 1.8rem;
  font-weight: 700;
  margin-left: 2px;
}
.stat-label {
  display: block;
  margin-top: 8px;
  font-size: 0.875rem;
  opacity: 0.85;
}

/* ========== Workflow ========== */
.workflow-section {
  padding: var(--space) 0;
  background: var(--c-bg-alt);
}
.workflow-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: clamp(1rem, 2vw, 1.5rem);
}
.workflow-item {
  position: relative;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-card);
  padding: 2rem 1.5rem;
  transition: box-shadow 0.3s ease, transform 0.3s ease, border-color 0.3s ease;
}
.workflow-item:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
  border-color: var(--c-primary);
}
.workflow-num {
  display: block;
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  font-weight: 100;
  color: rgba(20,86,90,0.3);
  line-height: 1;
  margin-bottom: 16px;
}
.workflow-item h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 8px;
}
.workflow-item p {
  font-size: 0.875rem;
  color: var(--c-text-2);
  line-height: 1.8;
}

/* ========== FAQ ========== */
.faq-section { padding: var(--space) 0; }
.faq-list {
  max-width: 820px;
  margin: 0 auto;
}
.faq-item {
  border-bottom: 1px solid var(--c-border);
}
.faq-item:first-child { border-top: 1px solid var(--c-border); }
.faq-q {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 22px 4px;
  font-size: 16px;
  font-weight: 600;
  text-align: left;
  transition: color 0.2s ease;
}
.faq-q:hover { color: var(--c-primary); }
.faq-q .icon {
  flex-shrink: 0;
  font-size: 22px;
  font-weight: 400;
  color: var(--c-primary);
  transition: transform 0.35s ease;
}
.faq-item.active .faq-q .icon { transform: rotate(45deg); }
.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
}
.faq-item.active .faq-a { max-height: 320px; }
.faq-a p {
  padding: 0 4px 22px;
  color: var(--c-text-2);
  font-size: 0.9375rem;
  line-height: 1.9;
}

/* ========== CTA ========== */
.cta-section { padding: 0 0 var(--space); }
.cta-banner {
  background: var(--c-bg-alt);
  border: 1px solid var(--c-border);
  border-radius: 20px;
  padding: clamp(2rem, 4vw, 3.5rem);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  position: relative;
  overflow: hidden;
}
.cta-banner::before {
  content: '';
  position: absolute;
  right: -60px;
  bottom: -80px;
  width: 260px;
  height: 160px;
  background: var(--c-primary);
  opacity: 0.04;
  border-radius: 50% 50% 0 50%;
}
.cta-content { position: relative; z-index: 1; }
.cta-content h2 {
  font-size: clamp(1.5rem, 2.6vw, 2rem);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 10px;
}
.cta-content p {
  color: var(--c-text-2);
  font-size: 0.9375rem;
  line-height: 1.8;
  max-width: 520px;
}
.cta-banner .btn { position: relative; z-index: 1; flex-shrink: 0; }

/* ========== Footer ========== */
.site-footer {
  background: var(--c-primary-deep);
  color: rgba(255,255,255,0.9);
  padding: 64px 0 32px;
}
.site-footer .logo-text {
  color: #fff;
  font-size: 1.35rem;
}
.site-footer .logo-sub { color: rgba(255,255,255,0.7); }
.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,0.12);
}
.footer-brand p {
  margin-top: 16px;
  font-size: 0.875rem;
  color: rgba(255,255,255,0.65);
  line-height: 1.9;
  max-width: 300px;
}
.footer-col h4 {
  font-size: 0.9375rem;
  font-weight: 600;
  color: #fff;
  margin-bottom: 16px;
}
.footer-col ul li { margin-bottom: 10px; }
.footer-col a {
  font-size: 0.875rem;
  color: rgba(255,255,255,0.7);
  transition: color 0.2s ease;
}
.footer-col a:hover { color: #fff; }
.footer-contact li { font-size: 0.875rem; color: rgba(255,255,255,0.7); }
.footer-contact li span { margin-right: 6px; color: rgba(255,255,255,0.45); }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  padding-top: 24px;
  font-size: 0.8125rem;
  color: rgba(255,255,255,0.55);
}
.footer-links { display: flex; gap: 20px; }
.footer-links a {
  color: rgba(255,255,255,0.55);
  transition: color 0.2s ease;
}
.footer-links a:hover { color: #fff; }

/* ========== Modal ========== */
.modal {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 300;
}
.modal.open { display: flex; }
.modal-overlay {
  position: absolute;
  inset: 0;
  background: rgba(15,25,25,0.5);
  -webkit-backdrop-filter: blur(4px);
  backdrop-filter: blur(4px);
}
.modal-card {
  position: relative;
  width: 480px;
  max-width: calc(100% - 40px);
  background: var(--c-surface);
  border-radius: var(--radius-card);
  padding: 2rem;
  box-shadow: var(--shadow-modal);
  animation: modalIn 0.3s ease;
}
@keyframes modalIn {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}
.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  color: var(--c-text-2);
  font-size: 18px;
  transition: background 0.2s ease, color 0.2s ease;
}
.modal-close:hover { background: var(--c-bg-alt); color: var(--c-ink); }
.modal-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 6px;
}
.modal-card .modal-sub {
  font-size: 0.875rem;
  color: var(--c-text-2);
  margin-bottom: 24px;
}
.form-group { margin-bottom: 18px; }
.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 6px;
}
.form-group input,
.form-group textarea {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-input);
  font-size: 0.9375rem;
  background: var(--c-bg);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
  color: var(--c-ink);
}
.form-group textarea { resize: vertical; min-height: 80px; }
.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--c-primary);
  box-shadow: 0 0 0 3px rgba(20,86,90,0.12);
}
.form-group .error-msg {
  display: none;
  font-size: 0.75rem;
  color: var(--c-error);
  margin-top: 4px;
}
.form-group.invalid input,
.form-group.invalid textarea {
  border-color: var(--c-error);
}
.form-group.invalid .error-msg { display: block; }
.form-privacy {
  margin-top: 14px;
  font-size: 0.8125rem;
  color: var(--c-text-2);
  text-align: center;
}
.form-success {
  text-align: center;
  padding: 32px 0;
}
.form-success svg {
  width: 56px;
  height: 56px;
  color: var(--c-success);
  margin-bottom: 16px;
}
.form-success p {
  font-size: 0.9375rem;
  color: var(--c-ink);
  font-weight: 500;
}

/* ========== Reveal / Reduced Motion ========== */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible {
  opacity: 1;
  transform: none;
}
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001s !important;
    transition-duration: 0.001s !important;
  }
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
  html { scroll-behavior: auto; }
}

/* ========== Responsive ========== */
@media (max-width: 1100px) {
  .main-nav { gap: 18px; }
  .main-nav a { font-size: 14px; }
  .case-card--split { grid-template-columns: 1fr; }
  .case-card--split .case-media { min-height: 360px; }
  .case-card--reverse .case-media { order: 1; }
  .case-card--reverse .case-body { order: 2; }
  .workflow-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 767px) {
  .site-header .main-nav { display: none; }
  .nav-wrapper { height: 60px; }
  .nav-cta { padding: 8px 16px; font-size: 13px; }
  .logo-text { font-size: 1.2rem; }
  .logo-sub { font-size: 0.6875rem; }
  .mobile-tab-bar { display: flex; }
  body { padding-bottom: calc(64px + env(safe-area-inset-bottom)); }

  .case-card--full .case-media { aspect-ratio: 16 / 10; }
  .case-card--split .case-media { min-height: 260px; }
  .case-body { padding: 1.5rem; }
  .case-results { gap: 12px; }

  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .workflow-grid { grid-template-columns: 1fr; }
  .cta-banner { flex-direction: column; text-align: center; }
  .cta-banner .btn { width: 100%; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .footer-brand { grid-column: 1 / -1; }
  .footer-bottom { flex-direction: column; text-align: center; }
}

@media (max-width: 480px) {
  .nav-cta { display: none; }
  .case-results { display: grid; grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
}