:root {
  --bg: #0b1120;
  --bg-soft: #111827;
  --card: rgba(17, 24, 39, 0.85);
  --text: #e2e8f0;
  --muted: #94a3b8;
  --primary: #38bdf8;
  --primary-strong: #0ea5e9;
  --accent: #a855f7;
  --border: rgba(148, 163, 184, 0.2);
  --shadow: 0 18px 40px rgba(2, 6, 23, 0.4);
  --radius: 18px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  overflow-x: hidden;
}

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

.container {
  width: min(1400px, 100%);
  margin: 0 auto;
  padding: 0 3vw;
}

.bg-glow {
  position: fixed;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.6;
  z-index: -3;
}

.glow-a {
  top: -120px;
  left: -80px;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.45), transparent 70%);
}

.glow-b {
  bottom: -150px;
  right: -100px;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.45), transparent 70%);
}

.bg-grid {
  position: fixed;
  inset: 0;
  background-image: radial-gradient(rgba(148, 163, 184, 0.16) 1px, transparent 1px);
  background-size: 24px 24px;
  pointer-events: none;
  z-index: -4;
}

.hero {
  padding: 20px 0 64px;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 18px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(15, 23, 42, 0.7);
  backdrop-filter: blur(16px);
  box-shadow: 0 10px 30px rgba(2, 6, 23, 0.4);
}

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

.brand strong {
  display: block;
}

.brand span {
  font-size: 0.85rem;
  color: var(--muted);
}

.brand-mark {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  font-weight: 700;
}

.nav-links {
  display: flex;
  gap: 18px;
  font-size: 0.95rem;
  color: var(--muted);
}

.nav-links a:hover {
  color: var(--primary);
}

.theme-toggle {
  border: 1px solid var(--border);
  padding: 8px 14px;
  border-radius: 999px;
  background: transparent;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
}

.hero-body {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px;
  margin-top: 36px;
  align-items: center;
}

.pill {
  display: inline-flex;
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(56, 189, 248, 0.15);
  color: var(--primary);
  font-weight: 600;
  font-size: 0.9rem;
}

.hero-text h1 {
  font-size: clamp(2.3rem, 4vw, 3.4rem);
  margin: 16px 0 12px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin: 16px 0 22px;
}

.btn {
  padding: 12px 20px;
  border-radius: 12px;
  border: 1px solid transparent;
  font-weight: 600;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn.primary {
  background: var(--primary);
  color: #00111f;
  box-shadow: 0 14px 24px rgba(56, 189, 248, 0.35);
}

.btn.primary:hover {
  transform: translateY(-2px);
}

.btn.ghost {
  border-color: rgba(56, 189, 248, 0.4);
  color: var(--primary);
}

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

.metric {
  background: var(--card);
  border-radius: 16px;
  border: 1px solid var(--border);
  padding: 14px 16px;
  text-align: center;
}

.metric-num {
  font-size: 1.6rem;
  font-weight: 700;
  display: block;
}

.metric-label {
  color: var(--muted);
  font-size: 0.85rem;
}

.hero-panel {
  background: var(--card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  padding: 22px;
  box-shadow: var(--shadow);
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--muted);
  font-size: 0.95rem;
}

.status {
  background: rgba(34, 197, 94, 0.2);
  color: #22c55e;
  padding: 4px 10px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.8rem;
}

.panel-list {
  list-style: none;
  padding: 0;
  margin: 16px 0;
  display: grid;
  gap: 10px;
  color: var(--text);
}

.panel-list li {
  display: flex;
  gap: 8px;
}

.panel-list li::before {
  content: "●";
  color: var(--primary);
}

.panel-footer {
  color: var(--muted);
  font-size: 0.9rem;
}

.section {
  margin: 0 auto 60px;
}

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 20px;
  margin-bottom: 20px;
}

.section-head p {
  color: var(--muted);
  margin: 8px 0 0;
}

.tag-list {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.tag-list span {
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.85rem;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}

.feature-card {
  background: var(--card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  padding: 20px;
  display: grid;
  gap: 12px;
  box-shadow: var(--shadow);
}

.feature-card h3 {
  margin: 0;
}

.feature-card ul {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
}

.structure-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}

.structure-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  display: grid;
  gap: 12px;
}

.file-list {
  display: grid;
  gap: 10px;
}

.file-row {
  display: grid;
  gap: 6px;
  font-size: 0.92rem;
  color: var(--muted);
}

.file-name {
  color: var(--primary);
  font-weight: 600;
}

.pill-group {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.pill-group span {
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(59, 130, 246, 0.15);
  color: var(--primary);
  font-size: 0.85rem;
}

.security-grid,
.deploy-grid,
.media-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}

.security-card,
.deploy-card,
.media-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  color: var(--muted);
}

.security-card h3,
.deploy-card h3,
.media-card h3 {
  color: var(--text);
  margin-top: 0;
}

.security-card ul,
.deploy-card ul {
  margin: 0;
  padding-left: 18px;
}

.footer {
  padding: 28px 0 36px;
  border-top: 1px solid var(--border);
  color: var(--muted);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

body.light {
  --bg: #f3f6ff;
  --bg-soft: #ffffff;
  --card: #ffffff;
  --text: #0f172a;
  --muted: #64748b;
  --primary: #2563eb;
  --primary-strong: #1d4ed8;
  --accent: #9333ea;
  --border: rgba(148, 163, 184, 0.35);
  --shadow: 0 18px 40px rgba(15, 23, 42, 0.12);
}

body.light .nav {
  background: rgba(255, 255, 255, 0.8);
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
}

body.light .bg-grid {
  background-image: radial-gradient(rgba(15, 23, 42, 0.08) 1px, transparent 1px);
}

body.light .bg-glow {
  opacity: 0.4;
}

.to-top {
  position: fixed;
  right: 18px;
  bottom: 18px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: none;
  background: var(--primary);
  color: #00111f;
  box-shadow: var(--shadow);
  cursor: pointer;
  display: none;
}

.to-top.show {
  display: grid;
  place-items: center;
}

@media (max-width: 960px) {
  .nav {
    flex-wrap: wrap;
    justify-content: center;
  }

  .nav-links {
    width: 100%;
    justify-content: center;
  }

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

  .section-head {
    flex-direction: column;
    align-items: flex-start;
  }

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