:root {
  --primary: #152535;
  --primary-soft: #1e3348;
  --accent: #c4a062;
  --accent-light: #e8d5b0;
  --bg: #faf9f6;
  --bg-alt: #f3f0ea;
  --surface: #ffffff;
  --text: #1c1c1c;
  --text-muted: #5c5c5c;
  --border: rgba(21, 37, 53, 0.08);
  --shadow: 0 18px 50px rgba(21, 37, 53, 0.08);
  --radius: 12px;
  --max: 1180px;
  --nav-h: 72px;
  --font-display: "Noto Serif SC", "Songti SC", serif;
  --font-body: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

.container {
  width: min(100% - 48px, var(--max));
  margin-inline: auto;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 9999;
  background: var(--accent);
  color: var(--primary);
  padding: 8px 16px;
}

.skip-link:focus {
  left: 16px;
  top: 16px;
}

/* Header */
.site-header {
  position: fixed;
  inset: 0 0 auto;
  height: var(--nav-h);
  z-index: 100;
  background: rgba(250, 249, 246, 0.88);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.logo {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--primary);
}

.logo span {
  color: var(--accent);
}

.nav-desktop {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-desktop a {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color 0.2s;
}

.nav-desktop a:hover,
.nav-desktop a:focus-visible {
  color: var(--primary);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  border-radius: 999px;
  background: var(--primary);
  color: #fff !important;
  font-size: 0.88rem;
  font-weight: 600;
  transition: transform 0.2s, background 0.2s;
}

.nav-cta:hover {
  background: var(--primary-soft);
  transform: translateY(-1px);
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 4px auto;
  background: var(--primary);
}

.mobile-nav {
  display: none;
  position: fixed;
  inset: var(--nav-h) 0 0;
  background: rgba(21, 37, 53, 0.96);
  padding: 32px 24px;
  z-index: 99;
}

.mobile-nav.open {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.mobile-nav a {
  color: #fff;
  font-size: 1.1rem;
  padding: 14px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

/* Hero */
.hero {
  padding: calc(var(--nav-h) + 72px) 0 96px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 10% 0%, rgba(196, 160, 98, 0.18), transparent 60%),
    radial-gradient(ellipse 60% 50% at 90% 20%, rgba(21, 37, 53, 0.06), transparent 55%),
    linear-gradient(180deg, var(--bg-alt), var(--bg));
  z-index: -1;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 56px;
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(196, 160, 98, 0.14);
  color: var(--primary);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 24px;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 5vw, 3.8rem);
  line-height: 1.15;
  color: var(--primary);
  margin-bottom: 20px;
}

.hero h1 em {
  font-style: normal;
  color: var(--accent);
}

.hero-lead {
  font-size: 1.08rem;
  color: var(--text-muted);
  max-width: 34rem;
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 48px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 28px;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 600;
  border: 2px solid transparent;
  cursor: pointer;
  transition: all 0.25s ease;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}

.btn-primary:hover {
  background: var(--primary-soft);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.btn-secondary {
  background: transparent;
  border-color: var(--primary);
  color: var(--primary);
}

.btn-secondary:hover {
  background: var(--primary);
  color: #fff;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.stat-card {
  padding: 20px;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
}

.stat-num {
  font-family: var(--font-display);
  font-size: 1.8rem;
  color: var(--primary);
  line-height: 1.1;
}

.stat-label {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 4px;
}

.hero-panel {
  padding: 32px;
  border-radius: 20px;
  background: var(--primary);
  color: #fff;
  box-shadow: var(--shadow);
}

.hero-panel h2 {
  font-family: var(--font-display);
  font-size: 1.35rem;
  margin-bottom: 20px;
}

.hero-panel ul {
  list-style: none;
  display: grid;
  gap: 14px;
}

.hero-panel li {
  display: flex;
  gap: 12px;
  font-size: 0.95rem;
  color: rgba(255, 255, 255, 0.88);
}

.hero-panel li::before {
  content: "✦";
  color: var(--accent);
  flex-shrink: 0;
}

/* Trust bar */
.trust-bar {
  padding: 28px 0;
  border-block: 1px solid var(--border);
  background: var(--surface);
}

.trust-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.trust-label {
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  font-weight: 600;
}

.trust-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.trust-tags span {
  padding: 8px 14px;
  border-radius: 999px;
  background: var(--bg-alt);
  font-size: 0.85rem;
  color: var(--primary);
  font-weight: 500;
}

/* Sections */
.section {
  padding: 96px 0;
}

.section-alt {
  background: var(--bg-alt);
}

.section-head {
  max-width: 640px;
  margin-bottom: 56px;
}

.section-label {
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 700;
  margin-bottom: 12px;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  color: var(--primary);
  line-height: 1.25;
  margin-bottom: 14px;
}

.section-desc {
  color: var(--text-muted);
  font-size: 1.02rem;
}

/* Cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.service-card,
.case-card,
.geo-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: transform 0.25s, box-shadow 0.25s;
}

.service-card:hover,
.case-card:hover,
.geo-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.service-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  background: rgba(196, 160, 98, 0.15);
  font-size: 1.4rem;
  margin-bottom: 18px;
}

.service-card h3,
.case-card h3,
.geo-card h3 {
  font-size: 1.1rem;
  color: var(--primary);
  margin-bottom: 10px;
}

.service-card p,
.case-card p,
.geo-card p {
  font-size: 0.92rem;
  color: var(--text-muted);
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}

.tag {
  font-size: 0.75rem;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--bg-alt);
  color: var(--text-muted);
}

/* GEO section */
.geo-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}

.geo-highlight {
  padding: 36px;
  border-radius: 20px;
  background: linear-gradient(145deg, var(--primary), var(--primary-soft));
  color: #fff;
}

.geo-highlight h3 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  margin-bottom: 16px;
}

.geo-highlight p {
  color: rgba(255, 255, 255, 0.82);
  margin-bottom: 24px;
}

.geo-metrics {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.geo-metric {
  padding: 16px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.08);
}

.geo-metric strong {
  display: block;
  font-size: 1.4rem;
  color: var(--accent-light);
}

.geo-metric span {
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.7);
}

/* Process */
.process-list {
  display: grid;
  gap: 0;
  max-width: 760px;
}

.process-item {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 24px;
  padding: 28px 0;
  border-bottom: 1px solid var(--border);
}

.process-item:last-child {
  border-bottom: none;
}

.process-num {
  font-family: var(--font-display);
  font-size: 2.2rem;
  color: var(--accent);
  line-height: 1;
}

.process-item h3 {
  color: var(--primary);
  margin-bottom: 6px;
}

.process-item p {
  color: var(--text-muted);
  font-size: 0.94rem;
}

/* Cases */
.case-tag {
  display: inline-block;
  font-size: 0.72rem;
  padding: 4px 10px;
  border-radius: 6px;
  background: var(--accent-light);
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 12px;
}

.case-stats {
  display: flex;
  gap: 24px;
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

.case-stat strong {
  display: block;
  font-size: 1.2rem;
  color: var(--accent);
}

.case-stat span {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* About */
.about-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 48px;
  align-items: center;
}

.about-text p {
  color: var(--text-muted);
  margin-bottom: 16px;
}

.values-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.value-card {
  padding: 24px;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
  text-align: center;
}

.value-card .icon {
  font-size: 1.6rem;
  margin-bottom: 8px;
}

.value-card h4 {
  color: var(--primary);
  margin-bottom: 4px;
  font-size: 0.95rem;
}

.value-card p {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* FAQ */
.faq-list {
  max-width: 760px;
  display: grid;
  gap: 12px;
}

.faq-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.faq-item summary {
  padding: 20px 24px;
  cursor: pointer;
  font-weight: 600;
  color: var(--primary);
  list-style: none;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item p {
  padding: 0 24px 20px;
  color: var(--text-muted);
  font-size: 0.94rem;
}

/* Contact */
.contact-section {
  background: var(--primary);
  color: #fff;
  text-align: center;
}

.contact-section .section-title {
  color: #fff;
}

.contact-section .section-desc {
  color: rgba(255, 255, 255, 0.72);
  margin-inline: auto;
}

.contact-cards {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 24px;
  margin-top: 40px;
}

.contact-card {
  min-width: 220px;
  padding: 28px 32px;
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.contact-card h4 {
  color: var(--accent-light);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.contact-card a,
.contact-card p {
  color: #fff;
  font-size: 1rem;
}

.hero-panel .hero-quote {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  font-size: 0.88rem;
  color: var(--accent-light);
  font-style: italic;
  line-height: 1.5;
}

/* Subsections */
.subsection-head {
  margin: 48px 0 20px;
}

.subsection-title {
  font-family: var(--font-display);
  font-size: 1.35rem;
  color: var(--primary);
  margin-bottom: 8px;
}

.subsection-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* Compare */
.compare-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 8px;
}

.compare-card {
  padding: 28px;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
}

.compare-card-accent {
  border-color: rgba(196, 160, 98, 0.45);
  background: linear-gradient(145deg, #fff, #faf6ee);
}

.compare-card h3 {
  font-size: 1rem;
  color: var(--primary);
  margin-bottom: 14px;
}

.compare-card ul {
  list-style: none;
  display: grid;
  gap: 8px;
}

.compare-card li {
  font-size: 0.9rem;
  color: var(--text-muted);
  padding-left: 1em;
  position: relative;
}

.compare-card li::before {
  content: "·";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
}

/* Tables */
.engine-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}

.data-table th,
.data-table td {
  padding: 14px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

.data-table th {
  background: var(--bg-alt);
  color: var(--primary);
  font-weight: 600;
  white-space: nowrap;
}

.data-table tr:last-child td {
  border-bottom: none;
}

.data-table td {
  color: var(--text-muted);
}

/* Schema grid */
.schema-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
}

.schema-item {
  padding: 16px;
  border-radius: 10px;
  background: var(--surface);
  border: 1px solid var(--border);
  text-align: center;
}

.schema-item strong {
  display: block;
  color: var(--primary);
  margin-bottom: 4px;
  font-size: 0.95rem;
}

.schema-item span {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* Platforms */
.region-block {
  margin-bottom: 40px;
}

.region-title {
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: var(--primary);
  margin-bottom: 20px;
}

.platform-note {
  margin-top: 32px;
  padding: 24px 28px;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
}

.platform-note p {
  color: var(--text-muted);
  font-size: 0.94rem;
  line-height: 1.7;
}

/* Product tiers */
.tier-stack {
  display: grid;
  gap: 20px;
}

.tier-card {
  padding: 32px;
  border-radius: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
}

.tier-flagship {
  border-color: rgba(196, 160, 98, 0.5);
  background: linear-gradient(145deg, #fffefb, #f8f3e8);
}

.tier-badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 4px 12px;
  border-radius: 999px;
  background: var(--primary);
  color: #fff;
  margin-bottom: 12px;
}

.tier-card h3 {
  font-family: var(--font-display);
  font-size: 1.35rem;
  color: var(--primary);
  margin-bottom: 8px;
}

.tier-desc {
  color: var(--text-muted);
  font-size: 0.94rem;
  margin-bottom: 16px;
}

.tier-modules {
  list-style: none;
  display: grid;
  gap: 8px;
  margin-bottom: 16px;
}

.tier-modules li {
  font-size: 0.9rem;
  color: var(--text-muted);
  padding-left: 1.2em;
  position: relative;
}

.tier-modules li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
}

.tier-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  font-size: 0.8rem;
  color: var(--text-muted);
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.content-standard {
  margin-top: 40px;
  padding: 28px;
  border-radius: var(--radius);
  background: var(--bg-alt);
  border: 1px solid var(--border);
}

.content-standard h3 {
  font-size: 1rem;
  color: var(--primary);
  margin-bottom: 16px;
}

.standard-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 10px;
}

.standard-grid span {
  font-size: 0.85rem;
  color: var(--text-muted);
  padding: 10px 12px;
  background: var(--surface);
  border-radius: 8px;
  border: 1px solid var(--border);
}

/* Process extras */
.process-list-wide {
  max-width: none;
}

.process-tools {
  margin-top: 40px;
  padding-top: 28px;
  border-top: 1px solid var(--border);
}

.process-tools .trust-tags {
  margin-top: 12px;
}

/* Footer */
.site-footer {
  padding: 32px 0;
  background: #0d1520;
  color: rgba(255, 255, 255, 0.55);
  font-size: 0.85rem;
  text-align: center;
}

/* Header actions (mobile contact CTA) */
.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.header-contact {
  display: none;
  align-items: center;
  justify-content: center;
  padding: 8px 16px;
  border-radius: 999px;
  border: none;
  background: var(--accent);
  color: var(--primary);
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.2s;
}

.header-contact:hover {
  background: var(--accent-light);
}

/* Floating contact (right-side, follows scroll) */
.contact-fab {
  position: fixed;
  right: 18px;
  bottom: 24px;
  z-index: 200;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 12px;
}

.contact-fab-panel {
  display: flex;
  flex-direction: column;
  gap: 10px;
  opacity: 0;
  pointer-events: none;
  transform: translateY(12px);
  transition: opacity 0.25s ease, transform 0.25s ease;
}

.contact-fab.open .contact-fab-panel {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.fab-item {
  -webkit-appearance: none;
  appearance: none;
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 208px;
  padding: 12px 16px;
  border-radius: 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: 0 10px 30px rgba(21, 37, 53, 0.12);
  cursor: pointer;
  text-align: left;
  font: inherit;
  color: inherit;
  transition: transform 0.2s, box-shadow 0.2s;
}

.fab-item:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.fab-icon {
  font-size: 1.3rem;
  line-height: 1;
}

.fab-text {
  display: flex;
  flex-direction: column;
  line-height: 1.3;
}

.fab-text strong {
  font-size: 0.9rem;
  color: var(--primary);
}

.fab-text small {
  font-size: 0.76rem;
  color: var(--text-muted);
}

.contact-fab-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 18px;
  border-radius: 999px;
  border: none;
  background: var(--accent);
  color: var(--primary);
  font-size: 0.92rem;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 12px 30px rgba(196, 160, 98, 0.45);
  transition: transform 0.2s, background 0.2s;
}

.contact-fab-toggle:hover {
  transform: translateY(-2px);
  background: var(--accent-light);
}

.fab-toggle-icon {
  font-size: 1.1rem;
}

.fab-toast {
  position: fixed;
  left: 50%;
  bottom: 100px;
  transform: translateX(-50%) translateY(20px);
  z-index: 300;
  padding: 10px 20px;
  border-radius: 999px;
  background: var(--primary);
  color: #fff;
  font-size: 0.85rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease;
}

.fab-toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

@media (max-width: 768px) {
  .contact-fab {
    right: 14px;
    bottom: 18px;
  }

  .fab-item {
    min-width: 196px;
  }
}

/* Responsive */
@media (max-width: 960px) {
  .compare-grid {
    grid-template-columns: 1fr;
  }

  .data-table {
    font-size: 0.82rem;
  }

  .data-table th,
  .data-table td {
    padding: 10px 12px;
  }

  .hero-grid,
  .geo-layout,
  .about-grid {
    grid-template-columns: 1fr;
  }

  .hero-panel {
    order: -1;
  }
}

@media (max-width: 768px) {
  .nav-desktop,
  .header-inner .nav-cta {
    display: none;
  }

  .menu-toggle {
    display: block;
  }

  .header-contact {
    display: inline-flex;
  }

  .hero-stats {
    grid-template-columns: 1fr;
  }

  .values-grid {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 72px 0;
  }
}