:root {
  --ink: #181613;
  --cinnabar: #C23A2B;
  --cinnabar-dark: #A82F22;
  --cinnabar-light: rgba(194, 58, 43, 0.10);
  --paper: #FCFAF5;
  --paper-2: #F4EFE5;
  --paper-3: #ECE4D6;
  --paper-white: #FFFDF8;
  --stone: #4A8490;
  --ink-light: #6E675E;
  --text-tertiary: #9C9388;
  --divider: #E3DACB;
  --shadow: rgba(65, 45, 20, 0.08);
  --shadow-deep: rgba(65, 45, 20, 0.14);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  --font-display: 'Playfair Display', 'Noto Serif SC', 'Source Han Serif CN', serif;
  --font-body: 'Noto Serif SC', 'Source Han Serif CN', 'Songti SC', serif;
  --max-width: 1200px;
  --header-height: 72px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink);
  background-color: var(--paper);
  -webkit-font-smoothing: antialiased;
}

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

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

ul {
  list-style: none;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 44px;
  padding: 0 24px;
  border-radius: var(--radius-full);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 700;
  line-height: 1;
  transition: all 0.2s ease;
  cursor: pointer;
  border: none;
}

.btn-primary {
  background-color: var(--cinnabar);
  color: var(--paper-white);
  box-shadow: 0 6px 14px rgba(194, 58, 43, 0.24);
}

.btn-primary:hover {
  background-color: var(--cinnabar-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 18px rgba(194, 58, 43, 0.30);
}

.btn-secondary {
  background-color: var(--cinnabar-light);
  color: var(--cinnabar);
}

.btn-secondary:hover {
  background-color: rgba(194, 58, 43, 0.16);
}

.btn-large {
  height: 52px;
  padding: 0 32px;
  font-size: 15px;
}

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 56px;
  background-color: rgba(252, 250, 245, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 1000;
  transition: all 0.3s ease;
}

.navbar.scrolled {
  border-bottom: 1px solid var(--divider);
  box-shadow: 0 4px 20px var(--shadow);
  background-color: rgba(252, 250, 245, 0.95);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-logo {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  object-fit: contain;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--ink);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  font-size: 14px;
  color: var(--ink-light);
  transition: color 0.2s ease;
  position: relative;
}

.nav-link:hover {
  color: var(--cinnabar);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--cinnabar);
  transition: width 0.2s ease;
}

.nav-link:hover::after {
  width: 100%;
}

.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 24px;
  height: 18px;
  background: transparent;
  border: none;
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--ink);
  transition: all 0.3s ease;
}

.hero {
  padding-top: calc(var(--header-height) + 80px);
  padding-bottom: 120px;
  overflow: hidden;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 64px;
  align-items: center;
}

.hero-tag {
  display: inline-block;
  padding: 6px 14px;
  background-color: var(--paper-2);
  border: 1px solid var(--divider);
  border-radius: var(--radius-full);
  font-size: 13px;
  color: var(--ink-light);
  margin-bottom: 24px;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(48px, 6vw, 80px);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 16px;
  letter-spacing: 0.04em;
}

.hero-subtitle {
  font-size: clamp(20px, 2.5vw, 28px);
  color: var(--ink-light);
  margin-bottom: 20px;
  font-weight: 400;
}

.hero-desc {
  font-size: 16px;
  color: var(--ink-light);
  max-width: 520px;
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.hero-stats {
  display: flex;
  gap: 48px;
}

.stat-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat-number {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 700;
  color: var(--cinnabar);
  line-height: 1;
}

.stat-label {
  font-size: 13px;
  color: var(--ink-light);
}

.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-image-wrapper {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: 0 24px 60px var(--shadow-deep);
  border: 1px solid var(--divider);
  background-color: var(--paper-white);
}

.hero-image {
  width: 100%;
  max-width: 420px;
  aspect-ratio: 9 / 19;
  object-fit: cover;
}

.hero-watermark {
  position: absolute;
  right: -40px;
  bottom: 60px;
  font-family: var(--font-display);
  font-size: 160px;
  font-weight: 700;
  color: var(--cinnabar);
  opacity: 0.06;
  pointer-events: none;
  writing-mode: vertical-rl;
}

.seal {
  position: absolute;
  width: 80px;
  height: 80px;
  background-color: var(--cinnabar);
  color: var(--paper-white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 700;
  border-radius: var(--radius-sm);
  transform: rotate(-8deg);
  box-shadow: 0 8px 20px rgba(194, 58, 43, 0.30);
}

.seal-hero {
  right: -20px;
  top: 40px;
}

.section {
  padding: 120px 0;
}

.section-paper {
  background-color: var(--paper-2);
}

.section-header {
  margin-bottom: 64px;
}

.section-header.center {
  text-align: center;
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
}

.section-eyebrow {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 13px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: 16px;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(32px, 4vw, 48px);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 17px;
  color: var(--ink-light);
}

.core-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 100px;
  align-items: start;
}

.core-left .section-title em {
  font-style: normal;
  color: var(--cinnabar);
}

.core-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 36px;
}

.core-feature-item {
  background-color: var(--paper-white);
  border: 1px solid var(--divider);
  border-radius: 12px;
  padding: 20px;
  transition: all 0.25s ease;
}

.core-feature-item:hover {
  border-color: rgba(194, 58, 43, 0.2);
  background-color: var(--cinnabar-light);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(194, 58, 43, 0.06);
}

.core-feature-icon {
  width: 34px;
  height: 34px;
  color: var(--cinnabar);
  margin-bottom: 12px;
  opacity: 0.85;
}

.core-feature-icon svg {
  width: 100%;
  height: 100%;
}

.core-feature-item h3 {
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 4px;
}

.core-feature-item p {
  font-size: 12.5px;
  color: var(--ink-light);
  line-height: 1.55;
}

.core-right {
  position: sticky;
  top: calc(var(--header-height) + 40px);
}

.core-showcase {
  background-color: var(--paper-white);
  border: 1px solid var(--divider);
  border-radius: 20px;
  padding: 28px;
  box-shadow: 0 4px 20px rgba(65, 45, 20, 0.04);
}

.core-showcase-img {
  width: 100%;
  aspect-ratio: 1.4;
  background-color: var(--paper);
  border-radius: 12px;
  border: 1px solid var(--divider);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  position: relative;
  overflow: hidden;
}

.core-showcase-char {
  font-family: var(--font-display);
  font-size: 80px;
  font-weight: 700;
  background: linear-gradient(135deg, var(--cinnabar), var(--ink));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  opacity: 0.6;
  position: relative;
  z-index: 1;
}

.core-showcase-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--divider) 1px, transparent 1px),
    linear-gradient(90deg, var(--divider) 1px, transparent 1px);
  background-size: 40px 40px;
  opacity: 0.3;
}

.cs-pinyin {
  font-family: var(--font-display);
  font-size: 14px;
  color: var(--cinnabar);
  letter-spacing: 0.04em;
  margin-bottom: 6px;
}

.cs-detail {
  font-size: 13px;
  color: var(--ink-light);
  line-height: 1.6;
}

.cs-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 100px;
  background-color: var(--cinnabar-light);
  color: var(--cinnabar);
  font-size: 12px;
  font-weight: 600;
  margin-top: 16px;
}

.cs-badge::before {
  content: '';
  width: 6px;
  height: 6px;
  background-color: var(--cinnabar);
  border-radius: 50%;
}

.gallery-layout {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 64px;
  align-items: center;
}

.gallery-text {
  padding-right: 40px;
}

.gallery-text .section-title {
  margin-bottom: 24px;
}

.gallery-text .section-desc {
  margin-bottom: 32px;
}

.gallery-scroll {
  overflow-x: auto;
  padding-bottom: 16px;
  -webkit-overflow-scrolling: touch;
}

.gallery-track {
  display: flex;
  gap: 20px;
  width: max-content;
}

.gallery-item {
  position: relative;
  width: 280px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 12px 28px var(--shadow);
  border: 1px solid var(--divider);
}

.gallery-item img {
  width: 280px;
  height: 380px;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.gallery-item:hover img {
  transform: scale(1.05);
}

.gallery-item figcaption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 16px;
  background: linear-gradient(to top, rgba(24, 22, 19, 0.8), transparent);
  color: var(--paper-white);
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
}

.tech-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.tech-card {
  padding: 28px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--divider);
  background-color: var(--paper-white);
  transition: all 0.2s ease;
}

.tech-card:hover {
  border-color: var(--cinnabar);
  transform: translateY(-4px);
}

.tech-card h3 {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
}

.tech-card p {
  font-size: 14px;
  color: var(--ink-light);
  line-height: 1.7;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: 900px;
  margin: 0 auto;
}

.pricing-card {
  position: relative;
  padding: 36px 28px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--divider);
  background-color: var(--paper-white);
  text-align: center;
  transition: all 0.2s ease;
}

.pricing-card.featured {
  border-color: var(--cinnabar);
  box-shadow: 0 12px 32px rgba(194, 58, 43, 0.12);
  transform: scale(1.02);
}

.pricing-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 36px var(--shadow-deep);
}

.pricing-card.featured:hover {
  transform: scale(1.02) translateY(-4px);
}

.pricing-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  padding: 4px 14px;
  background-color: var(--cinnabar);
  color: var(--paper-white);
  font-size: 12px;
  font-weight: 700;
  border-radius: var(--radius-full);
}

.pricing-card h3 {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
}

.pricing-price {
  font-family: var(--font-display);
  font-size: 36px;
  font-weight: 700;
  color: var(--cinnabar);
  margin-bottom: 20px;
}

.pricing-card ul {
  text-align: left;
  display: inline-block;
}

.pricing-card li {
  padding: 8px 0;
  padding-left: 24px;
  position: relative;
  font-size: 14px;
  color: var(--ink-light);
}

.pricing-card li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 14px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--cinnabar);
}

.pricing-note {
  text-align: center;
  margin-top: 32px;
  font-size: 13px;
  color: var(--text-tertiary);
}

.steps {
  display: flex;
  align-items: stretch;
  justify-content: center;
  gap: 24px;
}

.step {
  flex: 1;
  max-width: 320px;
  text-align: center;
  padding: 32px;
}

.step-number {
  display: block;
  font-family: var(--font-display);
  font-size: 64px;
  font-weight: 700;
  color: var(--cinnabar);
  opacity: 0.2;
  line-height: 1;
  margin-bottom: 16px;
}

.step h3 {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 10px;
}

.step p {
  font-size: 14px;
  color: var(--ink-light);
  line-height: 1.7;
}

.step-divider {
  width: 60px;
  height: 1px;
  background-color: var(--divider);
  align-self: center;
}

.cta-section {
  padding: 120px 0;
  background-color: var(--paper-2);
  text-align: center;
}

.cta-title {
  font-family: var(--font-display);
  font-size: clamp(32px, 4vw, 48px);
  font-weight: 700;
  margin-bottom: 16px;
}

.cta-desc {
  font-size: 17px;
  color: var(--ink-light);
  margin-bottom: 32px;
}

.footer {
  padding: 80px 0 32px;
  background-color: var(--paper-3);
  color: var(--ink-light);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 64px;
}

.footer-desc {
  max-width: 280px;
  margin-top: 16px;
  font-size: 14px;
  line-height: 1.7;
}

.footer-col h4 {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 20px;
}

.footer-col li {
  margin-bottom: 12px;
}

.footer-col a {
  font-size: 14px;
  transition: color 0.2s ease;
}

.footer-col a:hover {
  color: var(--cinnabar);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  padding-top: 24px;
  border-top: 1px solid var(--divider);
  font-size: 13px;
}

.legal-section {
  padding-top: calc(var(--header-height) + 80px);
  padding-bottom: 120px;
}

.legal-container {
  max-width: 800px;
}

.legal-header {
  margin-bottom: 48px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--divider);
}

.legal-title {
  font-family: var(--font-display);
  font-size: 40px;
  font-weight: 700;
  margin-bottom: 8px;
}

.legal-updated {
  font-size: 14px;
  color: var(--text-tertiary);
}

.legal-body {
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-light);
}

.legal-body h2 {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  color: var(--ink);
  margin-top: 40px;
  margin-bottom: 16px;
}

.legal-body p {
  margin-bottom: 16px;
}

.legal-body ul {
  list-style: disc;
  padding-left: 24px;
  margin-bottom: 16px;
}

.legal-body li {
  margin-bottom: 8px;
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .reveal {
    opacity: 1;
    transform: none;
  }
  .btn, .tech-card, .pricing-card, .gallery-item img {
    transition: none;
  }
}

@media (max-width: 1023px) {
  .navbar {
    padding: 0 24px;
  }
  .core-layout {
    grid-template-columns: 1fr;
    gap: 48px;
  }
  .core-right {
    position: static;
  }
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 48px;
  }
  .hero-visual {
    order: -1;
  }
  .hero-image {
    max-width: 320px;
  }
  .core-features {
    grid-template-columns: 1fr 1fr;
  }
  .tech-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .gallery-layout {
    grid-template-columns: 1fr;
    gap: 48px;
  }
  .gallery-text {
    padding-right: 0;
  }
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 767px) {
  .container {
    padding: 0 16px;
  }
  .section {
    padding: 80px 0;
  }
  .nav-menu {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 24px;
    background-color: var(--paper);
    transform: translateX(100%);
    transition: transform 0.3s ease;
  }
  .nav-menu.open {
    transform: translateX(0);
  }
  .nav-link {
    display: block;
    width: 100%;
    padding: 16px 0;
    font-size: 18px;
    border-bottom: 1px solid var(--divider);
  }
  .menu-toggle {
    display: flex;
  }
  .menu-toggle.open span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
  }
  .menu-toggle.open span:nth-child(2) {
    opacity: 0;
  }
  .menu-toggle.open span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
  }
  .hero {
    padding-top: calc(var(--header-height) + 48px);
    padding-bottom: 80px;
  }
  .hero-title {
    font-size: 44px;
  }
  .hero-stats {
    gap: 24px;
  }
  .hero-watermark {
    font-size: 100px;
    right: -20px;
  }
  .seal-hero {
    width: 60px;
    height: 60px;
    font-size: 16px;
    right: 0;
  }
  .core-features {
    grid-template-columns: 1fr;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  .pricing-card.featured {
    transform: none;
  }
  .pricing-card.featured:hover {
    transform: translateY(-4px);
  }
  .steps {
    flex-direction: column;
    align-items: center;
  }
  .step-divider {
    width: 1px;
    height: 40px;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }
}