:root {
  --bg: #07111f;
  --bg-soft: #0d1a2b;
  --card: rgba(255, 255, 255, 0.06);
  --card-strong: rgba(255, 255, 255, 0.1);
  --line: rgba(255, 255, 255, 0.12);
  --text: #f4f7fb;
  --muted: #aac1d9;
  --accent: #59d0ff;
  --accent-strong: #1d9fe3;
  --shadow: 0 24px 50px rgba(0, 0, 0, 0.28);
  --radius: 24px;
  --container: 1120px;
  --font: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background:
    radial-gradient(circle at top, rgba(89, 208, 255, 0.18), transparent 30%),
    linear-gradient(180deg, #06101c, #0b1524 48%, #09121d 100%);
}

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

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

.container {
  width: min(calc(100% - 32px), var(--container));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(18px);
  background: rgba(6, 16, 28, 0.72);
  border-bottom: 1px solid var(--line);
}

.nav {
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand,
.nav-links {
  display: flex;
  align-items: center;
}

.brand {
  gap: 12px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.nav-side {
  display: flex;
  align-items: center;
  gap: 16px;
}

.nav-links {
  gap: 24px;
  color: var(--muted);
  font-size: 0.95rem;
}

.language-switcher {
  display: inline-flex;
  align-items: center;
  width: 132px;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.04);
  cursor: pointer;
}

.language-tab {
  flex: 1 1 0;
  min-width: 0;
  min-height: 38px;
  padding: 0 14px;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  transition: background 160ms ease, color 160ms ease, transform 160ms ease;
}

.language-tab:hover,
.language-tab:focus-visible {
  color: var(--text);
}

.language-tab.is-active {
  color: #04101a;
  background: linear-gradient(135deg, var(--accent), #8fe6ff);
}

.hero,
.section {
  padding: 88px 0;
}

.hero-grid,
.showcase-grid,
.contact-strip {
  display: grid;
  gap: 36px;
  align-items: center;
}

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

.eyebrow {
  margin: 0 0 14px;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.18em;
}

h1,
h2,
h3,
p {
  margin: 0;
}

h1 {
  font-size: clamp(2.6rem, 5vw, 4.8rem);
  line-height: 0.98;
  max-width: 14ch;
}

h2 {
  font-size: clamp(1.8rem, 3vw, 3rem);
  line-height: 1.05;
}

h3 {
  font-size: 1.15rem;
  margin-top: 18px;
  margin-bottom: 10px;
}

.hero-text,
.section-text,
.card p,
.media-card figcaption,
.feature-list,
.hero-stats span {
  color: var(--muted);
  line-height: 1.75;
}

.hero-text,
.section-text {
  max-width: 62ch;
  margin-top: 20px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  border-radius: 999px;
  font-weight: 700;
}

.button.primary {
  color: #04101a;
  background: linear-gradient(135deg, var(--accent), #8fe6ff);
}

.button.secondary {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.03);
}

.hero-stats {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  padding: 0;
  margin: 32px 0 0;
}

.hero-stats li,
.card,
.media-card,
.showcase-panel,
.contact-strip {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--card);
  box-shadow: var(--shadow);
}

.hero-stats li {
  padding: 18px;
}

.hero-stats strong {
  display: block;
  margin-bottom: 8px;
  font-size: 1.4rem;
}

.hero-visual img,
.showcase-panel img {
  width: 100%;
}

.section-alt {
  background: rgba(255, 255, 255, 0.02);
}

.section-head {
  margin-bottom: 28px;
}

.card-grid,
.media-grid {
  display: grid;
  gap: 20px;
}

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

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

.card,
.media-card {
  padding: 24px;
}

.feature-list {
  padding-left: 18px;
  margin: 20px 0 0;
}

.showcase-panel {
  padding: 18px;
}

.video-shell {
  width: 100%;
  padding: 0;
  border: 0;
  background: transparent;
  color: inherit;
  cursor: pointer;
}

.video-shell img,
.video-shell video {
  width: 100%;
  border-radius: 18px;
}

.play-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: 14px;
  min-height: 42px;
  padding: 0 16px;
  border-radius: 999px;
  background: var(--card-strong);
  border: 1px solid var(--line);
}

.contact-strip {
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.25fr);
  padding: 32px;
}

.contact-copy .section-text {
  max-width: 58ch;
}

.contact-tip {
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  max-width: 60ch;
}

.contact-emails {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.contact-card {
  display: grid;
  gap: 10px;
  align-content: start;
  min-height: 100%;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background:
    linear-gradient(180deg, rgba(89, 208, 255, 0.1), rgba(255, 255, 255, 0.02)),
    rgba(255, 255, 255, 0.03);
  box-shadow: var(--shadow);
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

.contact-card:hover,
.contact-card:focus-visible {
  transform: translateY(-4px);
  border-color: rgba(143, 230, 255, 0.45);
  background:
    linear-gradient(180deg, rgba(89, 208, 255, 0.16), rgba(255, 255, 255, 0.03)),
    rgba(255, 255, 255, 0.05);
}

.contact-card:focus-visible {
  outline: 2px solid rgba(143, 230, 255, 0.55);
  outline-offset: 3px;
}

.contact-card-label {
  color: var(--accent);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.contact-card-meta {
  color: var(--muted);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.contact-card strong {
  font-size: 1.05rem;
  line-height: 1.3;
}

.contact-card-text {
  line-height: 1.7;
}

.contact-card-text .lang-en {
  font-size: 0.9rem;
}

@media (max-width: 960px) {
  .hero-grid,
  .showcase-grid,
  .contact-strip,
  .card-grid,
  .media-grid {
    grid-template-columns: 1fr;
  }

  .nav {
    padding: 14px 0;
    align-items: flex-start;
    flex-direction: column;
  }

  .nav-side {
    width: 100%;
    align-items: flex-start;
    flex-direction: column;
  }

  .nav-links {
    flex-wrap: wrap;
    gap: 14px;
  }

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

  .contact-emails {
    grid-template-columns: 1fr;
  }
}

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