/* 深空极光 — 藏蓝底 + 天青 / 紫罗兰光晕，偏现代云产品 */
:root {
  --bg-deep: #050810;
  --bg-elevated: #0c1222;
  --bg-card: rgba(15, 23, 42, 0.72);
  --accent: #38bdf8;
  --accent-dim: #0ea5e9;
  --accent-2: #c4b5fd;
  --accent-glow: rgba(56, 189, 248, 0.32);
  --accent-violet-glow: rgba(167, 139, 250, 0.22);
  --text: #f1f5f9;
  --text-muted: #94a3b8;
  --border: rgba(56, 189, 248, 0.12);
  --border-strong: rgba(147, 197, 253, 0.35);
  --radius: 16px;
  --font: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    "Helvetica Neue", Arial, sans-serif;
  --font-mono: "Cascadia Code", "Consolas", "SF Mono", monospace;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  background: var(--bg-deep);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

::selection {
  background: rgba(56, 189, 248, 0.35);
  color: var(--text);
}

.bg-mesh {
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(ellipse 110% 70% at 8% 15%, rgba(56, 189, 248, 0.16), transparent 55%),
    radial-gradient(ellipse 90% 60% at 92% 25%, rgba(167, 139, 250, 0.14), transparent 50%),
    radial-gradient(ellipse 70% 50% at 50% 105%, rgba(14, 165, 233, 0.1), transparent 45%),
    var(--bg-deep);
  animation: aurora-breathe 22s ease-in-out infinite;
}

@keyframes aurora-breathe {
  0%,
  100% {
    filter: saturate(1) brightness(1);
  }
  50% {
    filter: saturate(1.08) brightness(1.03);
  }
}

.bg-grid {
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(56, 189, 248, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(167, 139, 250, 0.06) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 75% 62% at 50% 28%, black 15%, transparent 68%);
  pointer-events: none;
  animation: aurora-drift 32s ease-in-out infinite;
}

@keyframes aurora-drift {
  0%,
  100% {
    opacity: 0.95;
    transform: translate3d(0, 0, 0);
  }
  50% {
    opacity: 1;
    transform: translate3d(8px, -6px, 0);
  }
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background: radial-gradient(circle at 50% 0%, rgba(56, 189, 248, 0.06), transparent 45%);
  opacity: 0.9;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent-2);
  outline-offset: 2px;
}

.wrap {
  width: min(1120px, 100% - 40px);
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(18px) saturate(1.2);
  background: rgba(5, 8, 16, 0.78);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.35);
}

.site-header .wrap {
  position: relative;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 0;
  gap: 24px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.14rem;
  color: var(--text);
  letter-spacing: -0.02em;
}

.logo svg {
  flex-shrink: 0;
  filter: drop-shadow(0 0 14px var(--accent-glow));
}

.nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav a {
  color: var(--text-muted);
  font-size: 0.88rem;
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid transparent;
  transition: color 0.2s, background 0.2s, border-color 0.2s;
}

.nav a:hover {
  color: var(--text);
  background: rgba(56, 189, 248, 0.1);
  border-color: rgba(56, 189, 248, 0.15);
}

.header-cta {
  display: flex;
  align-items: center;
  gap: 10px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 999px;
  font-size: 0.93rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  font-family: inherit;
  transition: transform 0.15s, box-shadow 0.2s, background 0.2s, border-color 0.2s;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: linear-gradient(135deg, #0284c7 0%, #6366f1 55%, #8b5cf6 100%);
  color: #f8fafc;
  border: 1px solid rgba(147, 197, 253, 0.35);
  box-shadow: 0 8px 36px var(--accent-glow), 0 0 28px var(--accent-violet-glow);
}

.btn-primary:hover {
  box-shadow: 0 12px 44px var(--accent-glow), 0 0 36px var(--accent-violet-glow);
}

.btn-ghost {
  background: rgba(30, 41, 59, 0.45);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-ghost:hover {
  background: rgba(56, 189, 248, 0.1);
  border-color: var(--border-strong);
}

.menu-toggle {
  display: none;
  background: rgba(30, 41, 59, 0.55);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 12px;
  color: var(--text);
  cursor: pointer;
  font-family: inherit;
  font-size: 0.85rem;
}

@media (max-width: 860px) {
  .menu-toggle {
    display: inline-flex;
  }

  .nav-wrap {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    background: rgba(5, 8, 18, 0.97);
    border-bottom: 1px solid var(--border);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease;
  }

  .nav-wrap.is-open {
    max-height: 320px;
  }

  .nav {
    flex-direction: column;
    align-items: stretch;
    padding: 16px 20px 24px;
  }

  .nav a {
    text-align: center;
  }

  .header-cta .btn-ghost {
    display: none;
  }
}

.hero {
  padding: 72px 0 88px;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  border-radius: 999px;
  background: rgba(30, 41, 59, 0.55);
  border: 1px solid rgba(147, 197, 253, 0.28);
  color: #bae6fd;
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  margin-bottom: 24px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06);
}

.hero-badge svg {
  color: var(--accent-2);
  flex-shrink: 0;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 20px;
  background: linear-gradient(180deg, #f8fafc 0%, #bae6fd 45%, #c4b5fd 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0 0 48px var(--accent-violet-glow));
}

.hero-lead {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 560px;
  margin: 0 auto 36px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
  margin-bottom: 48px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  max-width: 720px;
  margin: 0 auto;
}

.stat {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 16px;
  backdrop-filter: blur(12px);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05), 0 8px 32px rgba(0, 0, 0, 0.25);
}

.stat-value {
  font-size: 1.68rem;
  font-weight: 700;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 6px;
  letter-spacing: 0.02em;
}

@media (max-width: 600px) {
  .hero-stats {
    grid-template-columns: 1fr;
  }
}

.section {
  padding: 64px 0;
}

.section-head {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 48px;
}

.section-head h2 {
  font-size: clamp(1.5rem, 3vw, 2.08rem);
  font-weight: 700;
  margin-bottom: 12px;
  color: #e2e8f0;
  text-shadow: 0 0 48px rgba(56, 189, 248, 0.12);
}

.section-head p {
  color: var(--text-muted);
  font-size: 1.03rem;
}

.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

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

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  backdrop-filter: blur(12px);
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

.card:hover {
  border-color: var(--border-strong);
  transform: translateY(-3px);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.35), 0 0 40px var(--accent-glow);
}

.card-icon {
  width: 48px;
  height: 48px;
  margin-bottom: 14px;
  color: var(--accent);
}

.card h3 {
  font-size: 1.12rem;
  margin-bottom: 10px;
  color: #f1f5f9;
}

.card p {
  color: var(--text-muted);
  font-size: 0.94rem;
}

.flow {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  align-items: stretch;
}

@media (max-width: 768px) {
  .flow {
    grid-template-columns: 1fr;
  }
}

.flow-step {
  position: relative;
  text-align: center;
  padding: 32px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

.flow-step-num {
  width: 38px;
  height: 38px;
  margin: 0 auto 16px;
  border-radius: 50%;
  background: linear-gradient(145deg, #0369a1, #7c3aed);
  color: #f8fafc;
  font-weight: 700;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(255, 255, 255, 0.18);
  box-shadow: 0 4px 16px var(--accent-violet-glow);
}

.flow-desc {
  color: var(--text-muted);
  font-size: 0.94rem;
  margin-top: 8px;
}

.code-inline {
  font-size: 0.85em;
  color: var(--accent);
  font-family: var(--font-mono);
  background: rgba(30, 41, 59, 0.85);
  padding: 2px 7px;
  border-radius: 6px;
  border: 1px solid var(--border);
}

.legal-card {
  max-width: 720px;
  margin: 0 auto;
}

.legal-text {
  color: var(--text-muted);
  font-size: 0.92rem;
}

.flow-arrow {
  position: absolute;
  top: 50%;
  right: -18px;
  transform: translateY(-50%);
  color: var(--accent-dim);
  font-size: 1.2rem;
  z-index: 1;
  opacity: 0.65;
}

@media (max-width: 768px) {
  .flow-arrow {
    display: none;
  }
}

.platforms {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

@media (max-width: 900px) {
  .platforms {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .platforms {
    grid-template-columns: 1fr;
  }
}

.platform {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 20px;
  text-align: center;
  transition: border-color 0.2s, box-shadow 0.2s;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

.platform:hover {
  border-color: var(--border-strong);
  box-shadow: 0 0 28px var(--accent-glow);
}

.platform svg {
  width: 40px;
  height: 40px;
  margin-bottom: 12px;
  color: var(--accent-dim);
}

.platform h4 {
  font-size: 1rem;
  margin-bottom: 6px;
  color: #e2e8f0;
}

.platform p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.download-zone {
  background: linear-gradient(
    180deg,
    rgba(56, 189, 248, 0.1) 0%,
    rgba(88, 28, 135, 0.06) 50%,
    transparent 100%
  );
  border: 1px solid var(--border-strong);
  border-radius: 24px;
  padding: 40px 32px;
  margin-top: 28px;
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.06),
    0 12px 48px rgba(0, 0, 0, 0.3);
}

.download-zone h3 {
  text-align: center;
  font-size: 1.32rem;
  margin-bottom: 8px;
  color: #f1f5f9;
}

.download-zone > p {
  text-align: center;
  color: var(--text-muted);
  margin-bottom: 28px;
  font-size: 0.95rem;
}

.download-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 14px;
}

.download-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  background: rgba(30, 41, 59, 0.5);
  border: 1px solid var(--border);
  border-radius: 14px;
  color: var(--text);
  text-decoration: none;
  transition: background 0.2s, border-color 0.2s, box-shadow 0.2s;
}

.download-item:hover {
  background: rgba(56, 189, 248, 0.1);
  border-color: var(--border-strong);
  box-shadow: 0 0 24px var(--accent-glow);
}

.download-item svg {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  color: var(--accent);
}

.download-item span strong {
  display: block;
  font-size: 0.95rem;
}

.download-item span small {
  color: var(--text-muted);
  font-size: 0.72rem;
  font-family: var(--font-mono);
}

.download-hint {
  margin-top: 20px;
  text-align: center;
  font-size: 0.84rem;
  color: var(--text-muted);
}

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

@media (max-width: 768px) {
  .compare {
    grid-template-columns: 1fr;
  }
}

.compare-col {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  background: var(--bg-card);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

.compare-col.featured {
  border-color: rgba(167, 139, 250, 0.45);
  background: linear-gradient(
    165deg,
    rgba(15, 23, 42, 0.85) 0%,
    rgba(88, 28, 135, 0.2) 100%
  );
  box-shadow: 0 0 0 1px var(--accent-violet-glow), 0 16px 48px rgba(0, 0, 0, 0.3);
}

.compare-col h4 {
  font-size: 1rem;
  margin-bottom: 8px;
  color: #f1f5f9;
}

.compare-col .tag {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 16px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.compare-col ul {
  list-style: none;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.compare-col li {
  padding: 6px 0;
  padding-left: 18px;
  position: relative;
}

.compare-col li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 0 10px var(--accent-glow);
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 40px 0;
  margin-top: 48px;
  background: linear-gradient(180deg, transparent, rgba(5, 8, 20, 0.65));
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  align-items: center;
  justify-content: space-between;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
}

.footer-links a {
  color: var(--text-muted);
  font-size: 0.85rem;
}

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

.footer-copy {
  font-size: 0.8rem;
  color: var(--text-muted);
}