/* ============================================
   智衍起源 - Anthropic inspired redesign
   ============================================ */

:root {
  --bg: #f5f0e8;
  --bg-soft: #efe7db;
  --surface: rgba(255, 252, 247, 0.78);
  --surface-strong: #fbf7f1;
  --line: rgba(55, 43, 30, 0.14);
  --line-strong: rgba(55, 43, 30, 0.24);
  --text: #1f1a16;
  --text-muted: #62574b;
  --text-soft: #7f7264;
  --accent: #1f1a16;
  --accent-soft: #f0e6d7;
  --shadow: 0 20px 60px rgba(44, 33, 20, 0.08);
  --radius: 28px;
  --radius-sm: 18px;
  --container: 1200px;
  --font-sans: "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-serif: "Noto Serif SC", Georgia, serif;
  --transition: 180ms ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--text);
  background:
    radial-gradient(circle at top, rgba(255, 255, 255, 0.7), transparent 28%),
    linear-gradient(180deg, #f7f2ea 0%, #f3ede4 100%);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a {
  color: inherit;
}

.page-grain {
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 160 160' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='1.05' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)' opacity='1'/%3E%3C/svg%3E");
}

.container {
  width: min(var(--container), calc(100% - 48px));
  margin: 0 auto;
}

.header {
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid rgba(55, 43, 30, 0.08);
  background: rgba(245, 240, 232, 0.82);
  backdrop-filter: blur(18px);
}

.header-inner {
  width: min(var(--container), calc(100% - 48px));
  margin: 0 auto;
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 18px;
}

.product-menu {
  position: relative;
  display: flex;
  align-items: center;
}

.product-menu::after {
  content: "";
  position: absolute;
  top: 100%;
  left: -12px;
  right: -12px;
  height: 18px;
}

.product-trigger {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--text-muted);
  font: inherit;
  font-size: 0.92rem;
  cursor: pointer;
  transition: color var(--transition);
}

.product-trigger:hover {
  color: var(--text);
}

.product-caret {
  width: 8px;
  height: 8px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: translateY(-1px) rotate(45deg);
  transition: transform var(--transition);
}

.product-menu.is-open .product-caret {
  transform: translateY(2px) rotate(225deg);
}

.product-dropdown {
  position: absolute;
  top: calc(100% + 16px);
  left: 50%;
  min-width: 220px;
  padding: 10px;
  display: grid;
  gap: 6px;
  border: 1px solid rgba(55, 43, 30, 0.12);
  border-radius: 22px;
  background: rgba(251, 247, 241, 0.96);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
  opacity: 0;
  visibility: hidden;
  transform: translateX(-50%) translateY(-8px);
  transition: transform var(--transition), opacity var(--transition), visibility var(--transition);
}

.product-menu.is-open .product-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.product-dropdown a {
  display: block;
  padding: 12px 14px;
  border-radius: 16px;
  text-decoration: none;
  color: var(--text-muted);
  transition: color var(--transition), background var(--transition);
}

.product-dropdown a:hover {
  color: var(--text);
  background: rgba(31, 26, 22, 0.045);
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.logo-mark {
  width: 38px;
  height: 38px;
  flex-shrink: 0;
  object-fit: contain;
  display: block;
}

.logo-text {
  font-size: 1rem;
}

.nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav a,
.product-trigger,
.lang-switch {
  text-decoration: none;
  color: var(--text-muted);
  font-size: 0.92rem;
  transition: color var(--transition), background var(--transition), border-color var(--transition);
}

.nav a:hover,
.product-trigger:hover,
.lang-switch:hover {
  color: var(--text);
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.38);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.38);
  cursor: pointer;
}

.nav-toggle span {
  width: 18px;
  height: 1.5px;
  margin: 0 auto;
  background: var(--text);
  transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle.is-active span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.nav-toggle.is-active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.is-active span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.hero {
  padding: 88px 0 44px;
}

.hero-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(320px, 0.85fr);
  gap: 42px;
  align-items: stretch;
}

.hero-copy {
  padding: 42px 0 20px;
}

.eyebrow,
.section-label,
.panel-kicker,
.feature-index {
  margin: 0 0 18px;
  color: var(--text-soft);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero-title,
.section-title {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.05;
}

.hero-title {
  max-width: 10ch;
  font-size: clamp(3rem, 7vw, 5.8rem);
}

.hero-desc,
.section-subtitle,
.rich-text p,
.feature-card p,
.capability-card p,
.scene-card p,
.hardware-card p,
.advantage-row p,
.pricing-note,
.platform-card p,
.showcase-quote p,
.contact-list,
.footer-meta,
.hero-metrics span {
  color: var(--text-muted);
}

.hero-desc {
  max-width: 620px;
  margin: 24px 0 0;
  font-size: 1.08rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 32px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 0 24px;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
  transition: transform var(--transition), background var(--transition), border-color var(--transition), color var(--transition);
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--accent);
  color: #f8f2e8;
}

.btn-primary:hover {
  background: #312920;
}

.btn-secondary {
  border-color: var(--line-strong);
  background: rgba(255, 255, 255, 0.42);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.72);
}

.btn-block {
  width: 100%;
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 38px;
  max-width: 700px;
}

.hero-metrics div {
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.hero-metrics strong {
  display: block;
  margin-bottom: 6px;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
}

.hero-metrics span {
  display: block;
  font-size: 0.92rem;
}

.hero-panel {
  display: flex;
}

.hero-panel-card,
.feature-card,
.capability-card,
.scene-card,
.hardware-card,
.pricing-card,
.platform-card,
.contact-card,
.showcase-quote {
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
}

.hero-panel-card {
  width: 100%;
  padding: 28px;
  border-radius: calc(var(--radius) + 8px);
}

.hero-panel-media {
  margin: 0 0 22px;
  overflow: hidden;
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.68);
  border: 1px solid rgba(55, 43, 30, 0.08);
}

.hero-panel-media img,
.showcase-media img,
.hardware-media img {
  width: 100%;
  height: auto;
  display: block;
}

.hardware-media {
  width: min(100%, 220px);
  aspect-ratio: 16 / 9;
  margin: 0 auto 18px;
  padding: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(55, 43, 30, 0.08);
}

.hardware-media img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.stack-flow {
  display: grid;
  gap: 16px;
}

.stack-node {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.46);
}

.stack-node span {
  display: inline-flex;
  margin-bottom: 12px;
  color: var(--text-soft);
  font-size: 0.82rem;
}

.stack-node h2,
.feature-card h3,
.capability-card h3,
.scene-card h3,
.hardware-card h3,
.pricing-card h3,
.platform-card h3,
.advantage-row h3,
.contact-card-title {
  margin: 0 0 10px;
  font-size: 1.22rem;
  line-height: 1.3;
}

.stack-node h2 {
  font-size: 1.05rem;
}

.stack-node p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.94rem;
}

.section {
  padding: 86px 0;
}

.section-bordered {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid rgba(55, 43, 30, 0.08);
}

.section-tint {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.25), rgba(239, 231, 219, 0.58));
}

.section-heading {
  max-width: 760px;
  margin-bottom: 30px;
}

.section-title {
  font-size: clamp(2rem, 4vw, 3.4rem);
}

.section-subtitle {
  margin: 16px 0 0;
  max-width: 720px;
  font-size: 1.02rem;
}

.intro-grid,
.showcase,
.contact-shell {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px;
  align-items: start;
}

.rich-text p {
  margin: 0 0 16px;
  font-size: 1rem;
}

.architecture-grid,
.capability-grid,
.scene-grid,
.hardware-grid,
.pricing-grid,
.platform-grid {
  display: grid;
  gap: 20px;
}

.architecture-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.capability-grid,
.platform-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.scene-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.hardware-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.pricing-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.feature-card,
.capability-card,
.scene-card,
.hardware-card,
.pricing-card,
.platform-card {
  padding: 28px;
  border-radius: var(--radius);
}

.showcase-copy {
  max-width: 650px;
}

.showcase-quote {
  padding: 32px;
  border-radius: 32px;
}

.showcase-quote p,
.showcase-quote figcaption {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 1.45rem;
  line-height: 1.45;
  color: var(--text);
}

.showcase-media {
  overflow: hidden;
  padding: 0;
}

.showcase-media figcaption {
  padding: 24px 28px 28px;
}

.advantage-list {
  border-top: 1px solid var(--line);
}

.advantage-row {
  display: grid;
  grid-template-columns: minmax(180px, 0.42fr) 1fr;
  gap: 18px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}

.advantage-row h3,
.advantage-row p {
  margin: 0;
}

.price-list,
.contact-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.price-list {
  display: grid;
  gap: 12px;
  margin-bottom: 16px;
}

.price-list li {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(55, 43, 30, 0.1);
  color: var(--text-muted);
}

.price-list strong {
  color: var(--text);
  font-weight: 700;
  text-align: right;
}

.pricing-note {
  margin: 0;
  font-size: 0.92rem;
}

.about-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1fr);
  gap: 28px;
}

.contact-shell {
  padding: 34px;
  border: 1px solid var(--line);
  border-radius: 34px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.42), rgba(255, 255, 255, 0.2));
}

.contact-card {
  padding: 28px;
  border-radius: 28px;
}

.contact-card-title {
  margin-bottom: 14px;
}

.contact-list {
  display: grid;
  gap: 10px;
  margin-bottom: 22px;
  color: var(--text-muted);
}

.contact-list li {
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(55, 43, 30, 0.1);
}

.footer {
  padding: 30px 0 44px;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 0.94rem;
  color: var(--text-muted);
}

.footer-brand .logo-mark {
  width: 32px;
  height: 32px;
}

.footer-meta {
  text-align: right;
  font-size: 0.88rem;
}

.footer-meta p {
  margin: 0;
}

@media (max-width: 1080px) {
  .hero-layout,
  .intro-grid,
  .showcase,
  .contact-shell,
  .about-layout,
  .architecture-grid,
  .scene-grid,
  .pricing-grid {
    grid-template-columns: 1fr;
  }

  .capability-grid,
  .hardware-grid,
  .platform-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero-title {
    max-width: 12ch;
  }
}

@media (max-width: 820px) {
  .header-inner {
    min-height: 68px;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .nav {
    position: fixed;
    top: 76px;
    left: 16px;
    right: 16px;
    display: grid;
    gap: 4px;
    padding: 14px;
    border: 1px solid var(--line-strong);
    border-radius: 24px;
    background: rgba(251, 247, 241, 0.96);
    box-shadow: var(--shadow);
    transform: translateY(-12px);
    opacity: 0;
    visibility: hidden;
    transition: transform var(--transition), opacity var(--transition), visibility var(--transition);
  }

  .nav.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav a {
    padding: 12px 14px;
    border-radius: 16px;
  }

  .product-menu {
    display: grid;
    gap: 6px;
  }

  .product-menu::after {
    display: none;
  }

  .product-trigger {
    width: 100%;
    justify-content: space-between;
    padding: 12px 14px;
    border-radius: 16px;
  }

  .nav a:hover,
  .product-trigger:hover {
    background: rgba(31, 26, 22, 0.05);
  }

  .product-dropdown {
    position: static;
    min-width: 0;
    padding: 6px 0 0 14px;
    border: 0;
    border-left: 1px solid rgba(55, 43, 30, 0.12);
    border-radius: 0;
    background: transparent;
    box-shadow: none;
    backdrop-filter: none;
    opacity: 1;
    visibility: visible;
    transform: none;
    display: none;
  }

  .product-menu.is-open .product-dropdown {
    display: grid;
    transform: none;
  }

  .product-dropdown a {
    padding: 10px 12px;
    border-radius: 14px;
  }

  .hero {
    padding-top: 52px;
  }

  .hero-copy {
    padding-top: 12px;
  }

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

  .capability-grid,
  .hardware-grid,
  .platform-grid {
    grid-template-columns: 1fr;
  }

  .lang-switch {
    display: none;
  }

  .advantage-row {
    grid-template-columns: 1fr;
    gap: 8px;
  }
}

@media (max-width: 640px) {
  .container,
  .header-inner {
    width: calc(100% - 28px);
  }

  .section {
    padding: 64px 0;
  }

  .hero-title {
    font-size: clamp(2.5rem, 14vw, 4rem);
  }

  .hero-desc,
  .section-subtitle,
  .rich-text p {
    font-size: 0.98rem;
  }

  .hero-panel-card,
  .feature-card,
  .capability-card,
  .scene-card,
  .hardware-card,
  .pricing-card,
  .platform-card,
  .showcase-quote,
  .contact-card,
  .contact-shell {
    padding: 22px;
    border-radius: 24px;
  }

  .showcase-quote p {
    font-size: 1.2rem;
  }

  .showcase-media figcaption {
    padding: 18px 20px 22px;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer-meta {
    text-align: left;
  }
}