:root {
  --bg-deep: #050817;
  --bg-mid: #10172c;
  --bg-top: #070a18;
  --text: #eef2ff;
  --text-muted: #94a3b8;
  --accent: #7dd3fc;
  --accent-2: #f2d06b;
  --accent-3: #c084fc;
  --rim: rgba(125, 211, 252, 0.22);
  --panel: rgba(17, 24, 46, 0.72);
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
  --radius: 18px;
  --max: 1120px;
  --tap: #00d6b9;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(125, 211, 252, 0.14), transparent 55%),
    radial-gradient(ellipse 60% 40% at 90% 20%, rgba(192, 132, 252, 0.1), transparent 50%),
    radial-gradient(ellipse 50% 35% at 10% 80%, rgba(242, 208, 107, 0.08), transparent 45%),
    linear-gradient(180deg, var(--bg-top), var(--bg-mid) 42%, var(--bg-deep));
  line-height: 1.6;
}

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

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

.site-shell {
  position: relative;
  overflow: hidden;
}

.site-grid {
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.35;
  background-image:
    linear-gradient(rgba(125, 211, 252, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(125, 211, 252, 0.05) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 30%, black, transparent);
}

.site-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(14px);
  background: rgba(5, 8, 23, 0.72);
  border-bottom: 1px solid var(--rim);
}

.site-nav-inner,
.section-inner,
.site-footer-inner {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
}

.site-nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 68px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.brand-mark {
  width: 38px;
  height: 38px;
  border-radius: 12px;
  box-shadow: 0 8px 24px rgba(125, 211, 252, 0.18);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
  font-size: 0.95rem;
  color: var(--text-muted);
}

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

.nav-cta,
.hero-cta,
.footer-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 46px;
  padding: 0 20px;
  border-radius: 999px;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent), #2563eb);
  color: #04101f;
  box-shadow: 0 12px 30px rgba(37, 99, 235, 0.35);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.nav-cta:hover,
.hero-cta:hover,
.footer-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 16px 36px rgba(37, 99, 235, 0.42);
}

.hero {
  position: relative;
  padding: 72px 0 56px;
}

.hero-inner {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 48px;
  align-items: center;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border: 1px solid var(--rim);
  border-radius: 999px;
  color: var(--accent);
  font-size: 0.88rem;
  background: rgba(125, 211, 252, 0.08);
}

.hero h1 {
  margin: 18px 0 14px;
  font-size: clamp(2.4rem, 5vw, 4rem);
  line-height: 1.08;
  letter-spacing: 0.02em;
}

.hero h1 span {
  display: block;
  font-size: 0.42em;
  font-weight: 500;
  color: var(--text-muted);
  margin-top: 10px;
}

.hero-lead {
  max-width: 34rem;
  margin: 0 0 28px;
  color: #cbd5e1;
  font-size: 1.08rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
}

.hero-cta--secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--rim);
  box-shadow: none;
}

.hero-cta--secondary:hover {
  border-color: rgba(125, 211, 252, 0.5);
  box-shadow: 0 0 0 4px rgba(125, 211, 252, 0.08);
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-top: 28px;
  color: var(--text-muted);
  font-size: 0.92rem;
}

.hero-meta strong {
  display: block;
  color: var(--accent-2);
  font-size: 1.1rem;
}

.hero-visual {
  position: relative;
}

.hero-frame {
  position: relative;
  border-radius: 24px;
  overflow: hidden;
  border: 1px solid var(--rim);
  box-shadow: var(--shadow);
  aspect-ratio: 16 / 11;
}

.hero-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 45%, rgba(5, 8, 23, 0.82));
}

.hero-float {
  position: absolute;
  right: -8px;
  bottom: -18px;
  width: min(240px, 58%);
  padding: 16px 18px;
  border-radius: var(--radius);
  border: 1px solid var(--rim);
  background: var(--panel);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow);
}

.hero-float strong {
  display: block;
  color: var(--accent);
  margin-bottom: 4px;
}

.section {
  padding: 72px 0;
}

.section-head {
  max-width: 640px;
  margin-bottom: 36px;
}

.section-kicker {
  color: var(--accent);
  font-size: 0.88rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.section-head h2 {
  margin: 10px 0 12px;
  font-size: clamp(1.7rem, 3vw, 2.4rem);
}

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

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.feature-card,
.map-card,
.info-card {
  border: 1px solid var(--rim);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow);
}

.feature-card {
  padding: 24px;
}

.feature-icon {
  width: 44px;
  height: 44px;
  margin-bottom: 14px;
  color: var(--accent-2);
}

.feature-card h3 {
  margin: 0 0 8px;
  font-size: 1.1rem;
}

.feature-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

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

.map-card {
  overflow: hidden;
}

.map-card img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.map-card figcaption {
  padding: 14px 16px 16px;
}

.map-card strong {
  display: block;
  margin-bottom: 4px;
}

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

.info-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 18px;
}

.info-card {
  padding: 28px;
}

.info-card ul {
  margin: 0;
  padding-left: 18px;
  color: #cbd5e1;
}

.info-card li + li {
  margin-top: 10px;
}

.info-card .tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}

.tag {
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--rim);
  color: var(--accent);
  font-size: 0.86rem;
  background: rgba(125, 211, 252, 0.06);
}

.download-band {
  margin-top: 18px;
  padding: 28px;
  border-radius: calc(var(--radius) + 4px);
  border: 1px solid rgba(0, 214, 185, 0.28);
  background:
    radial-gradient(circle at top right, rgba(0, 214, 185, 0.12), transparent 42%),
    rgba(8, 16, 34, 0.9);
}

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

.download-band-copy {
  flex: 1 1 320px;
  min-width: 0;
}

.download-band h3 {
  margin: 0 0 8px;
  font-size: 1.35rem;
}

.download-band p {
  margin: 0 0 18px;
  color: var(--text-muted);
}

.download-qr {
  flex: 0 0 auto;
  margin: 0;
  text-align: center;
}

.download-qr img {
  width: 168px;
  height: 168px;
  border-radius: 16px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: #fff;
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.28);
}

.download-qr figcaption {
  margin-top: 10px;
  color: var(--text-muted);
  font-size: 0.88rem;
}

.download-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.tap-cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 50px;
  padding: 0 22px;
  border-radius: 14px;
  font-weight: 700;
  background: linear-gradient(135deg, #00d6b9, #00a98d);
  color: #04241f;
  box-shadow: 0 14px 30px rgba(0, 214, 185, 0.28);
}

.tap-cta small {
  display: block;
  font-weight: 500;
  opacity: 0.82;
  font-size: 0.78rem;
}

.forum-band {
  padding: 28px;
  border-radius: calc(var(--radius) + 4px);
  border: 1px solid rgba(192, 132, 252, 0.32);
  background:
    radial-gradient(circle at top right, rgba(192, 132, 252, 0.14), transparent 42%),
    rgba(12, 10, 34, 0.9);
}

.forum-band h3 {
  margin: 0 0 8px;
  font-size: 1.35rem;
}

.forum-band p {
  margin: 0 0 18px;
  color: var(--text-muted);
}

.forum-cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 50px;
  padding: 0 22px;
  border-radius: 14px;
  font-weight: 700;
  background: linear-gradient(135deg, #c084fc, #7c3aed);
  color: #f8f4ff;
  box-shadow: 0 14px 30px rgba(124, 58, 237, 0.28);
}

.forum-cta small {
  display: block;
  font-weight: 500;
  opacity: 0.88;
  font-size: 0.78rem;
}

.site-footer {
  padding: 36px 0 48px;
  border-top: 1px solid var(--rim);
  color: var(--text-muted);
  font-size: 0.92rem;
}

.site-footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  align-items: center;
  justify-content: space-between;
}

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

@media (max-width: 900px) {
  .hero-inner,
  .info-grid,
  .feature-grid,
  .map-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 42px;
  }

  .hero-float {
    position: static;
    width: 100%;
    margin-top: 14px;
  }

  .nav-links {
    display: none;
  }

  .download-band-inner {
    flex-direction: column;
    align-items: stretch;
  }

  .download-qr {
    align-self: center;
  }
}