:root {
  --bg: #0b0d0f;
  --bg-elevated: #12151a;
  --bg-soft: #181c22;
  --text: #e8eaed;
  --text-muted: #9aa3ad;
  --accent: #5ba3a8;
  --accent-soft: rgba(91, 163, 168, 0.16);
  --line: rgba(232, 234, 237, 0.12);
  --font-display: "Instrument Serif", "Times New Roman", Georgia, serif;
  --font-body: "DM Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-zh: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", "Noto Sans SC", "Source Han Sans SC", system-ui, sans-serif;
  --max: 1120px;
  --header-h: 72px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100%;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background:
    radial-gradient(1200px 600px at 70% -10%, rgba(91, 163, 168, 0.12), transparent 55%),
    radial-gradient(900px 500px at 10% 20%, rgba(232, 234, 237, 0.05), transparent 50%),
    linear-gradient(180deg, #0d1014 0%, var(--bg) 40%, #090b0d 100%);
  background-attachment: fixed;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.035;
  z-index: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

body.nav-open {
  overflow: hidden;
}

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

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

.wrap {
  width: min(100% - 2.5rem, var(--max));
  margin-inline: auto;
}

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 50;
  height: var(--header-h);
  display: flex;
  align-items: center;
  transition: background 0.35s var(--ease), border-color 0.35s var(--ease), backdrop-filter 0.35s;
  border-bottom: 1px solid transparent;
}

.site-header.is-scrolled {
  background: rgba(11, 13, 15, 0.78);
  backdrop-filter: blur(14px);
  border-bottom-color: var(--line);
}

.header-inner {
  width: min(100% - 2.5rem, var(--max));
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.logo {
  font-family: var(--font-display);
  font-size: 1.55rem;
  letter-spacing: 0.14em;
  font-weight: 400;
  z-index: 2;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

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

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

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.2rem;
  border: 1px solid var(--line);
  border-radius: 999px;
}

.lang-switch button {
  min-width: 2rem;
  padding: 0.25rem 0.55rem;
  border-radius: 999px;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--text-muted);
}

.lang-switch button.is-active {
  background: var(--accent-soft);
  color: var(--text);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  place-items: center;
  z-index: 2;
}

.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after {
  display: block;
  width: 18px;
  height: 1.5px;
  background: var(--text);
  position: relative;
  transition: transform 0.25s var(--ease);
}

.nav-toggle span::before,
.nav-toggle span::after {
  content: "";
  position: absolute;
  left: 0;
}

.nav-toggle span::before {
  top: -6px;
}

.nav-toggle span::after {
  top: 6px;
}

.nav-toggle[aria-expanded="true"] span {
  background: transparent;
}

.nav-toggle[aria-expanded="true"] span::before {
  top: 0;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span::after {
  top: 0;
  transform: rotate(-45deg);
}

.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  display: grid;
  align-items: end;
  overflow: hidden;
  isolation: isolate;
}

.hero-visual {
  position: absolute;
  inset: 0;
  z-index: -2;
  will-change: transform;
}

.hero-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 40%;
}

.hero-veil {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(180deg, rgba(11, 13, 15, 0.35) 0%, rgba(11, 13, 15, 0.55) 45%, rgba(11, 13, 15, 0.92) 100%),
    linear-gradient(90deg, rgba(11, 13, 15, 0.55) 0%, transparent 55%);
}

.hero-content {
  width: min(100% - 2.5rem, var(--max));
  margin: 0 auto;
  padding: calc(var(--header-h) + 4rem) 0 4.5rem;
  max-width: 40rem;
  animation: rise 1s var(--ease) both;
}

.hero-brand {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(3.2rem, 8vw, 5.5rem);
  line-height: 0.95;
  letter-spacing: 0.18em;
  font-weight: 400;
}

.hero h1 {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3.4vw, 2.45rem);
  font-weight: 400;
  line-height: 1.25;
  letter-spacing: 0.01em;
}

.hero-sub {
  margin: 0 0 2rem;
  color: var(--text-muted);
  font-size: 1.05rem;
  max-width: 32rem;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0.8rem 1.35rem;
  border-radius: 2px;
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  transition: background 0.2s, color 0.2s, border-color 0.2s, transform 0.2s;
}

.btn:focus-visible,
.lang-switch button:focus-visible,
.nav-toggle:focus-visible,
.site-nav a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.btn-primary {
  background: var(--text);
  color: var(--bg);
}

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

.btn-ghost {
  border: 1px solid var(--line);
  color: var(--text);
}

.btn-ghost:hover {
  border-color: rgba(232, 234, 237, 0.35);
  background: rgba(232, 234, 237, 0.04);
}

.section {
  position: relative;
  z-index: 1;
  padding: 6.5rem 0;
}

.section + .section {
  border-top: 1px solid var(--line);
}

.section-label {
  margin: 0 0 0.75rem;
  color: var(--accent);
  font-size: 0.8rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.section h2 {
  margin: 0 0 1.25rem;
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 3.5vw, 2.8rem);
  font-weight: 400;
  line-height: 1.2;
  max-width: 16ch;
}

.lead {
  margin: 0;
  color: var(--text-muted);
  font-size: 1.05rem;
  max-width: 38rem;
}

.essence .wrap,
.closing .wrap {
  display: grid;
  gap: 1.5rem;
}

.feature-list {
  display: grid;
  gap: 0;
  margin-top: 3rem;
}

.feature-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1.25rem;
  padding: 1.75rem 0;
  border-top: 1px solid var(--line);
}

.feature-item:last-child {
  border-bottom: 1px solid var(--line);
}

.feature-icon {
  width: 40px;
  height: 40px;
  color: var(--accent);
  margin-top: 0.15rem;
}

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

.feature-item h3 {
  margin: 0 0 0.45rem;
  font-size: 1.15rem;
  font-weight: 500;
}

.feature-item p {
  margin: 0;
  color: var(--text-muted);
  max-width: 42rem;
}

.design-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 3rem;
  align-items: center;
  margin-top: 2.5rem;
}

.design-media {
  position: relative;
  overflow: hidden;
  border-radius: 2px;
  background: var(--bg-soft);
  aspect-ratio: 1;
}

.design-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.sku-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  margin: 1.75rem 0 0;
  padding: 0;
  list-style: none;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.sku-list li {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.sku-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: 1px solid rgba(232, 234, 237, 0.35);
}

.sku-dot.ob {
  background: #1a1c1f;
}

.sku-dot.ts {
  background: #b8bcc2;
}

.sku-dot.dm {
  background: #6b2b33;
}

.scenes-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 1.25rem;
  margin-top: 2.75rem;
}

.scene-media {
  position: relative;
  overflow: hidden;
  border-radius: 2px;
  background: var(--bg-soft);
  min-height: 280px;
}

.scene-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.scene-media.tall {
  grid-row: span 2;
  min-height: 100%;
}

.scene-copy {
  display: grid;
  gap: 1.25rem;
  align-content: start;
  padding-top: 0.25rem;
}

.scene-item h3 {
  margin: 0 0 0.35rem;
  font-size: 1.1rem;
  font-weight: 500;
}

.scene-item p {
  margin: 0;
  color: var(--text-muted);
}

.specs-table {
  width: 100%;
  margin-top: 2.5rem;
  border-collapse: collapse;
}

.specs-table th,
.specs-table td {
  padding: 1.1rem 0;
  border-top: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
  font-weight: 400;
}

.specs-table tr:last-child th,
.specs-table tr:last-child td {
  border-bottom: 1px solid var(--line);
}

.specs-table th {
  width: 34%;
  color: var(--text-muted);
  font-size: 0.95rem;
}

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

.closing {
  text-align: left;
  background:
    linear-gradient(180deg, transparent, rgba(91, 163, 168, 0.06)),
    transparent;
}

.closing h2 {
  max-width: 14ch;
}

.site-footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--line);
  padding: 2rem 0 2.5rem;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2rem;
  align-items: center;
  justify-content: space-between;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer-brand {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  align-items: baseline;
}

.footer-brand strong {
  color: var(--text);
  font-weight: 500;
  letter-spacing: 0.08em;
}

.footer-links {
  display: flex;
  gap: 1.25rem;
}

.footer-links a:hover {
  color: var(--text);
}

.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

html[lang="en"] body {
  letter-spacing: 0.01em;
}

html[lang="zh-CN"] body {
  font-family: var(--font-zh);
}

html[lang="zh-CN"] .logo,
html[lang="zh-CN"] .hero-brand,
html[lang="zh-CN"] .hero h1,
html[lang="zh-CN"] .section h2,
html[lang="zh-CN"] .closing h2 {
  font-family: var(--font-zh);
  letter-spacing: 0.04em;
  font-weight: 500;
}

html[lang="zh-CN"] .logo,
html[lang="zh-CN"] .hero-brand {
  font-weight: 600;
  letter-spacing: 0.18em;
}

@media (max-width: 900px) {
  .design-grid,
  .scenes-grid {
    grid-template-columns: 1fr;
  }

  .scene-media.tall {
    grid-row: auto;
    min-height: 240px;
  }

  .section h2 {
    max-width: none;
  }
}

@media (max-width: 768px) {
  .nav-toggle {
    display: grid;
  }

  .site-nav {
    position: fixed;
    inset: 0;
    flex-direction: column;
    justify-content: center;
    gap: 1.5rem;
    background: rgba(11, 13, 15, 0.96);
    backdrop-filter: blur(16px);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-8px);
    transition: opacity 0.25s var(--ease), transform 0.25s var(--ease);
  }

  .site-nav.is-open {
    opacity: 1;
    pointer-events: auto;
    transform: none;
  }

  .site-nav a {
    font-size: 1.25rem;
    color: var(--text);
  }

  .hero-content {
    padding-bottom: 3.5rem;
  }

  .section {
    padding: 4.5rem 0;
  }

  .specs-table th,
  .specs-table td {
    display: block;
    width: 100%;
    padding: 0.35rem 0;
  }

  .specs-table th {
    padding-top: 1.1rem;
  }

  .specs-table td {
    padding-bottom: 1.1rem;
  }
}

@media (max-width: 480px) {
  .wrap,
  .header-inner,
  .hero-content {
    width: min(100% - 1.5rem, var(--max));
  }

  .hero-brand {
    letter-spacing: 0.12em;
  }

  .cta-row {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .reveal,
  .hero-content,
  .hero-visual {
    animation: none !important;
    transition: none !important;
    opacity: 1 !important;
    transform: none !important;
  }
}