:root {
  --bg: #0a1220;
  --bg-2: #101c30;
  --panel: rgba(16, 32, 54, 0.72);
  --line: rgba(120, 200, 220, 0.28);
  --text: #e8f2f8;
  --muted: #9bb0c4;
  --cyan: #3fd0c9;
  --mint: #7dffb3;
  --coral: #ff7a59;
  --glow: rgba(63, 208, 201, 0.35);
  --radius: 22px;
  --font-display: "Bahnschrift", "Segoe UI Variable", "PingFang SC", "Microsoft YaHei UI", sans-serif;
  --font-body: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--text);
  font-family: var(--font-body);
  background:
    radial-gradient(circle at 12% 8%, rgba(63, 208, 201, 0.16), transparent 28%),
    radial-gradient(circle at 88% 18%, rgba(255, 122, 89, 0.12), transparent 26%),
    radial-gradient(circle at 50% 100%, rgba(125, 255, 179, 0.08), transparent 34%),
    var(--bg);
  line-height: 1.65;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { font: inherit; cursor: pointer; }

.container {
  width: min(1160px, calc(100% - 2rem));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(14px);
  background: rgba(10, 18, 32, 0.78);
  border-bottom: 1px solid rgba(120, 200, 220, 0.12);
}

.nav {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.02em;
}

.logo-mark {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background:
    radial-gradient(circle at 35% 30%, #fff8, transparent 28%),
    conic-gradient(from 210deg, var(--cyan), var(--mint), var(--coral), var(--cyan));
  box-shadow: 0 0 0 4px rgba(63, 208, 201, 0.12), 0 0 24px var(--glow);
  font-size: 0.78rem;
  color: #071018;
}

.logo-text span { color: var(--cyan); }

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1rem;
  color: var(--muted);
}

.nav-links a {
  position: relative;
  padding: 0.2rem 0;
}

.nav-links a:hover,
.nav-links a.active { color: var(--text); }

.nav-links a.active::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -0.45rem;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  transform: translateX(-50%);
  box-shadow: 0 0 12px var(--cyan);
}

.lang-switch {
  display: flex;
  gap: 0.35rem;
  padding: 0.25rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.03);
}

.lang-switch button {
  border: 0;
  background: transparent;
  color: var(--muted);
  border-radius: 999px;
  padding: 0.35rem 0.75rem;
}

.lang-switch button.active {
  background: rgba(63, 208, 201, 0.18);
  color: var(--text);
}

.hero {
  position: relative;
  padding: 4.5rem 0 3.5rem;
  isolation: isolate;
}

.hero::before {
  content: "";
  position: absolute;
  inset: -10% 0 auto;
  height: 720px;
  background:
    radial-gradient(circle at center, transparent 0 92px, rgba(63, 208, 201, 0.08) 93px 94px, transparent 95px),
    radial-gradient(circle at center, transparent 0 160px, rgba(255, 122, 89, 0.08) 161px 162px, transparent 163px),
    radial-gradient(circle at center, transparent 0 240px, rgba(125, 255, 179, 0.07) 241px 242px, transparent 243px);
  mask-image: radial-gradient(circle at 70% 40%, #000 0%, transparent 68%);
  pointer-events: none;
  z-index: -1;
  animation: orbitPulse 10s ease-in-out infinite;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 2.5rem;
  align-items: center;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-bottom: 1.1rem;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.8rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(16, 32, 54, 0.65);
  color: var(--muted);
  font-size: 0.85rem;
}

.tag::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 10px var(--cyan);
}

.hero h1 {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(2rem, 4.4vw, 3.35rem);
  line-height: 1.18;
  letter-spacing: 0.01em;
  max-width: 14ch;
}

.hero h1 em {
  font-style: normal;
  color: var(--cyan);
}

.hero-lead {
  margin: 0 0 1.5rem;
  color: var(--muted);
  max-width: 42rem;
  font-size: 1.05rem;
}

.hero-actions,
.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-bottom: 1.6rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0.75rem 1.35rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-family: var(--font-display);
  font-weight: 650;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

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

.btn-primary {
  background: linear-gradient(135deg, var(--cyan), #2aa8b8 55%, var(--mint));
  color: #061018;
  box-shadow: 0 10px 30px rgba(63, 208, 201, 0.28);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.03);
  border-color: var(--line);
  color: var(--text);
}

.trust-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.8rem;
}

.trust-item {
  padding: 0.9rem 1rem;
  border-radius: 18px;
  border: 1px solid rgba(120, 200, 220, 0.16);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.04), transparent);
}

.trust-item strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.15rem;
}

.trust-item span {
  color: var(--muted);
  font-size: 0.86rem;
}

.node-stage {
  position: relative;
  min-height: 420px;
  border-radius: 50%;
  aspect-ratio: 1;
  max-width: 460px;
  margin-left: auto;
  background:
    radial-gradient(circle at 50% 50%, rgba(63, 208, 201, 0.12), transparent 42%),
    radial-gradient(circle at 50% 50%, transparent 0 34%, rgba(255, 122, 89, 0.12) 35% 35.6%, transparent 36.5%),
    radial-gradient(circle at 50% 50%, transparent 0 48%, rgba(125, 255, 179, 0.12) 49% 49.6%, transparent 50.5%),
    radial-gradient(circle at 50% 50%, transparent 0 62%, rgba(63, 208, 201, 0.1) 63% 63.5%, transparent 64.5%),
    rgba(8, 16, 28, 0.55);
  border: 1px solid rgba(120, 200, 220, 0.18);
  box-shadow: var(--shadow), inset 0 0 60px rgba(63, 208, 201, 0.08);
  overflow: hidden;
}

.node-stage img {
  position: absolute;
  inset: 18%;
  width: 64%;
  height: 64%;
  object-fit: cover;
  border-radius: 50%;
  border: 1px solid rgba(120, 200, 220, 0.35);
  box-shadow: 0 0 40px rgba(63, 208, 201, 0.2);
  animation: floatNode 6s ease-in-out infinite;
}

.node {
  position: absolute;
  width: 54px;
  height: 54px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 0.72rem;
  font-family: var(--font-display);
  background: rgba(10, 18, 32, 0.9);
  border: 1px solid rgba(63, 208, 201, 0.45);
  box-shadow: 0 0 18px rgba(63, 208, 201, 0.25);
  animation: nodePulse 4.5s ease-in-out infinite;
}

.node:nth-child(2) { top: 8%; left: 44%; animation-delay: 0.2s; }
.node:nth-child(3) { top: 28%; right: 6%; animation-delay: 0.6s; }
.node:nth-child(4) { bottom: 16%; right: 14%; animation-delay: 1s; color: var(--mint); border-color: rgba(125, 255, 179, 0.5); }
.node:nth-child(5) { bottom: 10%; left: 20%; animation-delay: 1.4s; color: var(--coral); border-color: rgba(255, 122, 89, 0.5); }
.node:nth-child(6) { top: 34%; left: 4%; animation-delay: 1.8s; }

.section {
  padding: 4.2rem 0;
}

.section-head {
  margin-bottom: 1.8rem;
  max-width: 44rem;
}

.section-kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--cyan);
  font-family: var(--font-display);
  font-size: 0.9rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 0.6rem;
}

.section-kicker::before {
  content: "";
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--coral);
  box-shadow: 0 0 12px var(--coral);
}

.section-head h2 {
  margin: 0 0 0.7rem;
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  line-height: 1.25;
}

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

.platform-grid,
.feature-grid,
.compat-grid,
.recommend-grid,
.scene-grid,
.faq-grid {
  display: grid;
  gap: 1rem;
}

.platform-grid,
.feature-grid,
.recommend-grid,
.scene-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

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

.card,
.platform-card,
.feature-card,
.compat-item,
.recommend-card,
.scene-card,
.faq-item,
.step-card,
.hint-box {
  border-radius: var(--radius);
  border: 1px solid rgba(120, 200, 220, 0.16);
  background:
    radial-gradient(circle at 100% 0%, rgba(63, 208, 201, 0.08), transparent 40%),
    var(--panel);
  box-shadow: var(--shadow);
}

.platform-card,
.feature-card,
.recommend-card,
.scene-card,
.faq-item,
.step-card,
.compat-item,
.hint-box {
  padding: 1.25rem 1.3rem;
}

.platform-card h3,
.feature-card h3,
.recommend-card h3,
.scene-card h3,
.faq-item h3,
.step-card h3 {
  margin: 0 0 0.55rem;
  font-family: var(--font-display);
  font-size: 1.15rem;
}

.platform-card p,
.feature-card p,
.recommend-card p,
.scene-card p,
.faq-item p,
.step-card p,
.compat-item p,
.hint-box p {
  margin: 0;
  color: var(--muted);
}

.meta-list {
  list-style: none;
  margin: 0.9rem 0 1.1rem;
  padding: 0;
  display: grid;
  gap: 0.45rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.meta-list li {
  display: flex;
  gap: 0.5rem;
  align-items: baseline;
}

.meta-list li::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  margin-top: 0.35rem;
  background: var(--mint);
  box-shadow: 0 0 10px rgba(125, 255, 179, 0.5);
  flex: 0 0 auto;
}

.feature-card {
  position: relative;
  overflow: hidden;
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: rgba(63, 208, 201, 0.45);
}

.feature-index {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  margin-bottom: 0.9rem;
  background: rgba(63, 208, 201, 0.12);
  border: 1px solid rgba(63, 208, 201, 0.35);
  color: var(--cyan);
  font-family: var(--font-display);
}

.how-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.2rem;
  align-items: stretch;
}

.flow-panel,
.preview-panel {
  padding: 1.4rem;
  border-radius: calc(var(--radius) + 4px);
  border: 1px solid rgba(120, 200, 220, 0.16);
  background: rgba(10, 18, 32, 0.55);
  box-shadow: var(--shadow);
}

.flow-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.9rem;
}

.flow-list li {
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 0.85rem;
  align-items: start;
}

.flow-num {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: linear-gradient(145deg, rgba(63, 208, 201, 0.25), rgba(255, 122, 89, 0.18));
  border: 1px solid rgba(63, 208, 201, 0.35);
  font-family: var(--font-display);
}

.flow-list h3 {
  margin: 0 0 0.3rem;
  font-size: 1.05rem;
  font-family: var(--font-display);
}

.flow-list p {
  margin: 0;
  color: var(--muted);
}

.preview-panel img {
  border-radius: 18px;
  border: 1px solid rgba(120, 200, 220, 0.2);
  margin-bottom: 1rem;
}

.code-box {
  margin: 0;
  padding: 1rem 1.1rem;
  border-radius: 16px;
  background: #07101a;
  border: 1px solid rgba(120, 200, 220, 0.16);
  color: #b7f0e8;
  font-size: 0.86rem;
  overflow-x: auto;
  line-height: 1.55;
}

.ability-row {
  margin-top: 1.2rem;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.8rem;
}

.ability-row span {
  display: block;
  padding: 0.85rem 1rem;
  border-radius: 16px;
  border: 1px dashed rgba(120, 200, 220, 0.28);
  background: rgba(255, 255, 255, 0.02);
  color: var(--muted);
  font-size: 0.92rem;
}

.compat-item {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 0.9rem;
  align-items: start;
}

.compat-dot {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: rgba(255, 122, 89, 0.12);
  border: 1px solid rgba(255, 122, 89, 0.35);
  color: var(--coral);
  font-family: var(--font-display);
  font-size: 0.78rem;
}

.recommend-card .badge {
  display: inline-flex;
  margin-bottom: 0.7rem;
  padding: 0.25rem 0.7rem;
  border-radius: 999px;
  background: rgba(125, 255, 179, 0.12);
  color: var(--mint);
  border: 1px solid rgba(125, 255, 179, 0.28);
  font-size: 0.8rem;
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-bottom: 1rem;
}

.step-card .step-label {
  display: inline-block;
  margin-bottom: 0.7rem;
  color: var(--cyan);
  font-family: var(--font-display);
  letter-spacing: 0.06em;
  font-size: 0.85rem;
}

.hint-box {
  border-color: rgba(255, 122, 89, 0.28);
  background:
    radial-gradient(circle at 0% 0%, rgba(255, 122, 89, 0.12), transparent 40%),
    var(--panel);
}

.hint-box strong {
  display: block;
  margin-bottom: 0.45rem;
  color: var(--coral);
  font-family: var(--font-display);
}

.scene-card {
  min-height: 160px;
}

.faq-item h3 { color: var(--text); }
.faq-item + .faq-item { }

.cta-band {
  margin: 1rem 0 3rem;
  padding: 2.4rem;
  border-radius: 30px;
  text-align: center;
  border: 1px solid rgba(63, 208, 201, 0.28);
  background:
    radial-gradient(circle at 50% 0%, rgba(63, 208, 201, 0.18), transparent 42%),
    radial-gradient(circle at 20% 100%, rgba(255, 122, 89, 0.12), transparent 35%),
    rgba(12, 22, 38, 0.9);
  box-shadow: var(--shadow);
}

.cta-band h2 {
  margin: 0 0 0.7rem;
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
}

.cta-band p {
  margin: 0 auto 1.4rem;
  color: var(--muted);
  max-width: 34rem;
}

.cta-actions { justify-content: center; margin-bottom: 0; }

.site-footer {
  border-top: 1px solid rgba(120, 200, 220, 0.12);
  padding: 3rem 0 1.5rem;
  background: rgba(6, 12, 22, 0.8);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr repeat(4, 1fr);
  gap: 1.2rem;
  margin-bottom: 1.8rem;
}

.site-footer h3,
.site-footer h4 {
  margin: 0 0 0.8rem;
  font-family: var(--font-display);
}

.site-footer p,
.site-footer li,
.site-footer a {
  color: var(--muted);
}

.site-footer ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.45rem;
}

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

.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  padding-top: 1.2rem;
  border-top: 1px solid rgba(120, 200, 220, 0.1);
  color: var(--muted);
  font-size: 0.9rem;
}

.page-hero {
  padding: 3.2rem 0 1.2rem;
}

.page-hero h1 {
  margin: 0 0 0.8rem;
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3.4vw, 2.6rem);
}

.page-hero p {
  margin: 0;
  color: var(--muted);
  max-width: 46rem;
}

.download-list {
  display: grid;
  gap: 1rem;
}

.download-card {
  display: grid;
  grid-template-columns: 1.2fr 1fr auto;
  gap: 1rem;
  align-items: center;
  padding: 1.3rem 1.4rem;
  border-radius: var(--radius);
  border: 1px solid rgba(120, 200, 220, 0.16);
  background: var(--panel);
}

.download-card h3 {
  margin: 0 0 0.4rem;
  font-family: var(--font-display);
}

.download-card p { margin: 0; color: var(--muted); }

.status {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--mint);
  font-size: 0.88rem;
}

.status::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--mint);
  box-shadow: 0 0 10px var(--mint);
}

.tutorial-layout {
  display: grid;
  gap: 1rem;
}

.docs-panel {
  padding: 1.4rem;
  border-radius: var(--radius);
  border: 1px solid rgba(120, 200, 220, 0.16);
  background: var(--panel);
}

.docs-panel h3 {
  margin: 0 0 0.7rem;
  font-family: var(--font-display);
}

.docs-panel p { margin: 0 0 0.8rem; color: var(--muted); }

.inline-img {
  border-radius: 18px;
  border: 1px solid rgba(120, 200, 220, 0.2);
  margin: 1rem 0;
}

@keyframes orbitPulse {
  0%, 100% { opacity: 0.75; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.03); }
}

@keyframes floatNode {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

@keyframes nodePulse {
  0%, 100% { transform: scale(1); box-shadow: 0 0 18px rgba(63, 208, 201, 0.25); }
  50% { transform: scale(1.05); box-shadow: 0 0 28px rgba(63, 208, 201, 0.4); }
}

@media (max-width: 980px) {
  .hero-grid,
  .how-grid,
  .download-card,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .node-stage {
    margin: 0 auto;
    max-width: 380px;
  }

  .platform-grid,
  .feature-grid,
  .recommend-grid,
  .scene-grid,
  .steps,
  .ability-row {
    grid-template-columns: 1fr 1fr;
  }

  .nav-links { display: none; }
}

@media (max-width: 640px) {
  .platform-grid,
  .feature-grid,
  .recommend-grid,
  .scene-grid,
  .steps,
  .ability-row,
  .compat-grid,
  .faq-grid,
  .trust-row {
    grid-template-columns: 1fr;
  }

  .cta-band { padding: 1.6rem; }
  .download-card { grid-template-columns: 1fr; }
}