:root {
  --bg: #0c0e12;
  --bg-2: #141820;
  --bg-3: #1a2030;
  --surface: #1e2636;
  --line: rgba(255, 255, 255, 0.08);
  --text: #e8ecf4;
  --muted: #9aa3b5;
  --accent: #3dd68c;
  --accent-2: #2bb673;
  --danger: #e25555;
  --gold: #e8b86d;
  --radius: 14px;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.45);
  --max: 1120px;
  --font: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(61, 214, 140, 0.12), transparent 55%),
    radial-gradient(900px 500px at 100% 0%, rgba(226, 85, 85, 0.08), transparent 50%),
    linear-gradient(180deg, #0a0c10 0%, var(--bg) 40%, #0b0f16 100%);
  color: var(--text);
  line-height: 1.75;
  min-height: 100vh;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-decoration: none; transition: color .2s, opacity .2s; }
a:hover { color: #6ee7a8; }
ul { list-style: none; }
.container { width: min(100% - 32px, var(--max)); margin: 0 auto; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 100;
  backdrop-filter: blur(16px);
  background: rgba(12, 14, 18, 0.82);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  min-height: 68px; gap: 16px;
}
.brand { display: flex; align-items: center; gap: 12px; color: var(--text); }
.brand img {
  width: 42px; height: 42px; border-radius: 10px;
  box-shadow: 0 0 0 1px rgba(61, 214, 140, 0.25);
}
.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-text strong { font-size: 1.05rem; letter-spacing: 0.04em; }
.brand-text span { font-size: 0.72rem; color: var(--muted); }
.nav { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.nav a {
  color: var(--muted); padding: 8px 12px; border-radius: 999px; font-size: 0.92rem;
}
.nav a:hover, .nav a.active { color: var(--text); background: rgba(61, 214, 140, 0.1); }
.nav .cta {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #04140c !important; font-weight: 700; padding: 9px 16px;
}
.menu-toggle {
  display: none; background: var(--surface); border: 1px solid var(--line);
  color: var(--text); width: 42px; height: 42px; border-radius: 10px; cursor: pointer;
}

/* Hero */
.hero {
  padding: 56px 0 40px;
  border-bottom: 1px solid var(--line);
}
.hero-grid {
  display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 36px; align-items: center;
}
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  color: var(--accent); font-size: 0.85rem; margin-bottom: 14px;
  letter-spacing: 0.06em;
}
.hero h1 {
  font-size: clamp(1.8rem, 3.4vw, 2.7rem);
  line-height: 1.25; margin-bottom: 16px; font-weight: 800;
}
.hero h1 em { font-style: normal; color: var(--accent); }
.hero-lead { color: var(--muted); font-size: 1.05rem; margin-bottom: 24px; max-width: 54ch; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 22px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 20px; border-radius: 12px; font-weight: 700; border: 1px solid transparent;
}
.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #04140c;
}
.btn-primary:hover { color: #04140c; opacity: 0.92; }
.btn-ghost {
  background: rgba(255,255,255,0.03); border-color: var(--line); color: var(--text);
}
.btn-ghost:hover { border-color: rgba(61,214,140,0.4); color: var(--accent); }
.hero-meta { display: flex; flex-wrap: wrap; gap: 18px; color: var(--muted); font-size: 0.9rem; }
.hero-meta strong { color: var(--text); display: block; font-size: 1.05rem; }
.hero-visual {
  position: relative; border-radius: 22px; overflow: hidden;
  box-shadow: var(--shadow); border: 1px solid var(--line);
  background: var(--bg-2);
}
.hero-visual img { width: 100%; aspect-ratio: 9/16; object-fit: cover; object-position: top; max-height: 560px; }
.hero-badge {
  position: absolute; left: 16px; bottom: 16px;
  background: rgba(8, 10, 14, 0.78); backdrop-filter: blur(8px);
  border: 1px solid var(--line); border-radius: 12px; padding: 10px 14px;
  font-size: 0.85rem;
}

/* Sections */
section { padding: 56px 0; }
.section-head { margin-bottom: 28px; max-width: 720px; }
.section-head h2 {
  font-size: clamp(1.45rem, 2.4vw, 1.9rem); margin-bottom: 10px; line-height: 1.3;
}
.section-head p { color: var(--muted); }
.section-alt { background: rgba(255,255,255,0.015); border-block: 1px solid var(--line); }

/* Feature grid */
.feature-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px;
}
.feature-card {
  background: linear-gradient(180deg, rgba(30,38,54,0.9), rgba(20,24,32,0.95));
  border: 1px solid var(--line); border-radius: var(--radius); padding: 22px;
}
.feature-card h3 { font-size: 1.08rem; margin-bottom: 8px; }
.feature-card p { color: var(--muted); font-size: 0.95rem; }
.feature-card .icon {
  width: 42px; height: 42px; border-radius: 12px; display: grid; place-items: center;
  background: rgba(61,214,140,0.12); color: var(--accent); margin-bottom: 14px; font-weight: 800;
}

/* Showcase */
.showcase-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px;
}
.shot {
  background: var(--bg-2); border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; transition: transform .25s, border-color .25s;
}
.shot:hover { transform: translateY(-4px); border-color: rgba(61,214,140,0.35); }
.shot img { width: 100%; aspect-ratio: 9/16; object-fit: cover; object-position: top; }
.shot-body { padding: 14px 16px 18px; }
.shot-body h3 { font-size: 1rem; margin-bottom: 6px; }
.shot-body p { color: var(--muted); font-size: 0.9rem; }

/* Content prose */
.prose { max-width: 820px; }
.prose h2, .prose h3 { margin: 1.6em 0 0.7em; line-height: 1.35; }
.prose p { margin-bottom: 1em; color: #c8d0df; }
.prose ul, .prose ol { margin: 0 0 1.1em 1.2em; color: #c8d0df; }
.prose li { margin-bottom: 0.45em; list-style: disc; }
.prose strong { color: var(--text); }
.toc {
  background: var(--bg-2); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px 20px; margin: 0 0 28px;
}
.toc h3 { margin-bottom: 10px; font-size: 1rem; }
.toc ol { margin: 0; padding-left: 1.2em; }
.toc li { list-style: decimal; margin-bottom: 6px; color: var(--muted); }
.toc a { color: var(--accent); }

/* Two column */
.split {
  display: grid; grid-template-columns: 1fr 1fr; gap: 28px; align-items: start;
}
.split-media {
  border-radius: var(--radius); overflow: hidden; border: 1px solid var(--line);
  box-shadow: var(--shadow); background: var(--bg-2);
}
.split-media img { width: 100%; aspect-ratio: 9/16; object-fit: cover; object-position: top; max-height: 640px; margin: 0 auto; }

/* Steps */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.step {
  background: var(--bg-2); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px;
}
.step .num {
  width: 34px; height: 34px; border-radius: 50%; display: grid; place-items: center;
  background: rgba(61,214,140,0.15); color: var(--accent); font-weight: 800; margin-bottom: 12px;
}
.step h3 { font-size: 1rem; margin-bottom: 8px; }
.step p { color: var(--muted); font-size: 0.92rem; }

/* FAQ */
.faq details {
  background: var(--bg-2); border: 1px solid var(--line); border-radius: 12px;
  padding: 14px 16px; margin-bottom: 10px;
}
.faq summary { cursor: pointer; font-weight: 700; list-style: none; }
.faq summary::-webkit-details-marker { display: none; }
.faq details[open] summary { color: var(--accent); margin-bottom: 8px; }
.faq p { color: var(--muted); }

/* CTA band */
.cta-band {
  margin: 20px 0 0; padding: 36px; border-radius: 20px;
  background:
    linear-gradient(135deg, rgba(61,214,140,0.16), rgba(226,85,85,0.08)),
    var(--bg-2);
  border: 1px solid var(--line); text-align: center;
}
.cta-band h2 { margin-bottom: 10px; }
.cta-band p { color: var(--muted); margin-bottom: 18px; }

/* Page hero for inner pages */
.page-hero {
  padding: 42px 0 28px; border-bottom: 1px solid var(--line);
}
.page-hero h1 { font-size: clamp(1.6rem, 3vw, 2.2rem); margin-bottom: 10px; }
.page-hero p { color: var(--muted); max-width: 60ch; }
.breadcrumb { color: var(--muted); font-size: 0.88rem; margin-bottom: 12px; }
.breadcrumb a { color: var(--muted); }
.breadcrumb a:hover { color: var(--accent); }

/* Legal */
.legal { padding: 40px 0 64px; }
.legal .prose { max-width: 860px; }
.legal h2 { font-size: 1.25rem; }
.update-note { color: var(--muted); font-size: 0.9rem; margin-bottom: 20px; }

/* Error pages */
.error-page {
  min-height: 70vh; display: grid; place-items: center; text-align: center; padding: 60px 16px;
}
.error-page .code {
  font-size: clamp(4rem, 12vw, 7rem); font-weight: 900; color: var(--accent);
  line-height: 1; margin-bottom: 8px;
}
.error-page h1 { margin-bottom: 12px; }
.error-page p { color: var(--muted); margin-bottom: 24px; max-width: 42ch; margin-inline: auto; }

/* Footer */
.site-footer {
  border-top: 1px solid var(--line); background: rgba(0,0,0,0.28); padding: 42px 0 24px; margin-top: 20px;
}
.footer-grid {
  display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 28px; margin-bottom: 28px;
}
.footer-brand { display: flex; gap: 12px; align-items: flex-start; }
.footer-brand img { width: 44px; height: 44px; border-radius: 10px; }
.footer-brand p { color: var(--muted); font-size: 0.9rem; margin-top: 8px; }
.footer-col h4 { margin-bottom: 12px; font-size: 0.95rem; }
.footer-col a { display: block; color: var(--muted); margin-bottom: 8px; font-size: 0.9rem; }
.footer-col a:hover { color: var(--accent); }
.footer-bottom {
  border-top: 1px solid var(--line); padding-top: 16px;
  display: flex; flex-wrap: wrap; gap: 10px; justify-content: space-between;
  color: var(--muted); font-size: 0.85rem;
}

/* Related links */
.related {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; margin-top: 24px;
}
.related a {
  display: block; padding: 14px 16px; border-radius: 12px;
  background: var(--bg-2); border: 1px solid var(--line); color: var(--text);
}
.related a:hover { border-color: rgba(61,214,140,0.4); color: var(--accent); }
.related span { display: block; color: var(--muted); font-size: 0.85rem; margin-top: 4px; }

/* Mobile */
@media (max-width: 960px) {
  .hero-grid, .split, .feature-grid, .showcase-grid, .steps, .footer-grid, .related {
    grid-template-columns: 1fr 1fr;
  }
  .steps { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .menu-toggle { display: inline-grid; place-items: center; }
  .nav {
    display: none; position: absolute; left: 16px; right: 16px; top: 68px;
    background: rgba(18, 22, 32, 0.98); border: 1px solid var(--line);
    border-radius: 14px; padding: 12px; flex-direction: column; align-items: stretch;
    box-shadow: var(--shadow);
  }
  .nav.open { display: flex; }
  .nav a { padding: 12px 14px; }
  .hero { padding: 32px 0 28px; }
  .hero-grid, .feature-grid, .showcase-grid, .steps, .split, .footer-grid, .related {
    grid-template-columns: 1fr;
  }
  .hero-visual img, .split-media img, .shot img { max-height: 520px; }
  section { padding: 40px 0; }
  .cta-band { padding: 28px 18px; }
}