:root {
  --primary: #1B2A41;
  --accent: #5AD1E8;
  --bg: #0D1520;
  --surface: #142235;
  --surface-2: #192B43;
  --text: #E6EEF5;
  --muted: #9FB0C2;
  --line: rgba(230, 238, 245, 0.12);
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.24);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.75;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
.container { width: min(1160px, calc(100% - 40px)); margin: 0 auto; }
.site-header {
  position: sticky; top: 0; z-index: 20;
  background: rgba(13, 21, 32, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px);
}
.nav { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: 0.03em; }
.brand img { width: 34px; height: 34px; }
.brand-word { font-size: 20px; }
.nav-links { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.nav-links a { color: var(--muted); padding: 7px 10px; border-radius: 8px; font-size: 14px; }
.nav-links a:hover, .nav-links a.active { color: var(--text); background: rgba(90, 209, 232, 0.12); }
.hero { padding: 86px 0 58px; }
.hero-grid { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 64px; align-items: center; }
.eyebrow { color: var(--accent); font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; font-size: 12px; }
h1, h2, h3 { margin: 0; line-height: 1.22; letter-spacing: 0; }
h1 { font-size: clamp(38px, 5.5vw, 68px); max-width: 700px; }
h2 { font-size: clamp(26px, 3.2vw, 40px); }
h3 { font-size: 19px; }
.hero h1 { margin: 16px 0 20px; }
.hero-copy { color: var(--muted); font-size: 17px; max-width: 600px; }
.actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 28px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 46px; padding: 0 20px; border: 1px solid transparent; border-radius: 10px; font-weight: 700; transition: transform .2s ease, box-shadow .2s ease, background .2s ease; }
.button-primary { background: var(--accent); color: #09202a; box-shadow: 0 10px 26px rgba(90, 209, 232, 0.22); }
.button-secondary { border-color: var(--line); color: var(--text); background: rgba(255,255,255,.03); }
.button:hover { transform: translateY(-2px); }
.phone-stage { min-height: 420px; display: grid; place-items: center; position: relative; }
.phone { width: min(300px, 78vw); padding: 11px; border: 1px solid rgba(90, 209, 232, .35); border-radius: 26px; background: #09111d; box-shadow: var(--shadow); transform: rotate(2deg); }
.phone-screen { overflow: hidden; border-radius: 18px; background: #edf6fa; color: #132237; }
.screen-top { padding: 14px 15px; background: var(--primary); color: white; display: flex; justify-content: space-between; font-size: 12px; }
.screen-body { padding: 15px; }
.screen-search { padding: 9px 11px; border-radius: 8px; background: #dfeaf0; color: #61778d; font-size: 11px; }
.screen-chips { display: flex; gap: 6px; margin: 12px 0; }
.screen-chips span { padding: 4px 8px; border-radius: 999px; background: #c6edf4; color: #125165; font-size: 10px; }
.screen-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; }
.cover { min-height: 105px; border-radius: 8px; padding: 10px; display: flex; align-items: flex-end; font-size: 12px; font-weight: 700; color: white; background: linear-gradient(145deg, #51738e, #1d2b4b); }
.cover:nth-child(2) { background: linear-gradient(145deg, #bb6b8e, #392b55); }
.cover:nth-child(3) { background: linear-gradient(145deg, #d28c59, #3a3f60); }
.cover:nth-child(4) { background: linear-gradient(145deg, #40a4a8, #203758); }
.section { padding: 72px 0; }
.section-head { display: flex; justify-content: space-between; align-items: end; gap: 24px; margin-bottom: 26px; }
.section-head p { margin: 0; color: var(--muted); max-width: 580px; }
.showcase-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.mockup { border: 1px solid var(--line); border-radius: 12px; background: var(--surface); overflow: hidden; box-shadow: var(--shadow); }
.mockup-label { padding: 13px 15px; display: flex; justify-content: space-between; color: var(--muted); font-size: 13px; border-bottom: 1px solid var(--line); }
.mockup-content { padding: 14px; min-height: 270px; }
.list-row { display: flex; gap: 10px; align-items: center; padding: 10px 0; border-bottom: 1px solid var(--line); }
.mini-cover { width: 45px; height: 58px; border-radius: 6px; background: linear-gradient(145deg, #4d8c9a, #26304a); flex: 0 0 auto; }
.list-row strong { display: block; font-size: 14px; }
.list-row span { color: var(--muted); font-size: 12px; }
.reader-demo { min-height: 240px; padding: 22px; border-radius: 8px; background: linear-gradient(135deg, #182b46, #0e1828); display: flex; flex-direction: column; justify-content: space-between; }
.reader-lines { color: #cfe0ea; font-family: Georgia, serif; font-size: 14px; }
.reader-toolbar { display: flex; justify-content: space-between; color: var(--accent); font-size: 12px; }
.feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.feature-card, .stat-card, .faq-item, .link-card, .article-card { border: 1px solid var(--line); background: var(--surface); border-radius: 12px; padding: 22px; }
.feature-card p, .link-card p, .article-card p, .faq-item p { color: var(--muted); margin: 10px 0 0; font-size: 14px; }
.feature-icon { width: 36px; height: 36px; display: grid; place-items: center; border-radius: 9px; background: rgba(90, 209, 232, .14); color: var(--accent); margin-bottom: 15px; font-size: 18px; }
.experience { background: #101c2c; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.experience-grid { display: grid; grid-template-columns: .85fr 1.15fr; gap: 42px; align-items: center; }
.control-list { display: grid; gap: 12px; }
.control-item { display: flex; justify-content: space-between; gap: 14px; padding: 15px 17px; border: 1px solid var(--line); border-radius: 10px; background: rgba(255,255,255,.02); }
.control-item span { color: var(--muted); font-size: 14px; }
.control-item b { color: var(--accent); font-size: 13px; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.stat-card strong { display: block; color: var(--accent); font-size: 34px; line-height: 1.1; }
.stat-card span { color: var(--muted); font-size: 13px; }
.faq-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.faq-item h3 { font-size: 17px; }
.link-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.link-card { min-height: 174px; display: flex; flex-direction: column; justify-content: space-between; }
.link-card a { color: var(--accent); font-weight: 700; font-size: 14px; }
.article-hero { padding: 74px 0 34px; }
.article-hero p { color: var(--muted); max-width: 760px; font-size: 17px; }
.article-layout { display: grid; grid-template-columns: minmax(0, 1fr) 280px; gap: 28px; align-items: start; }
.article-body { border: 1px solid var(--line); background: var(--surface); border-radius: 12px; padding: clamp(22px, 4vw, 42px); }
.article-body h2 { font-size: 25px; margin: 30px 0 12px; }
.article-body h2:first-child { margin-top: 0; }
.article-body p { color: #c6d2de; margin: 0 0 16px; }
.article-body ul { color: #c6d2de; padding-left: 20px; }
.article-body li { margin: 7px 0; }
.aside { position: sticky; top: 95px; display: grid; gap: 14px; }
.aside .feature-card { padding: 18px; }
.site-footer { padding: 42px 0 24px; border-top: 1px solid var(--line); color: var(--muted); }
.footer-grid { display: flex; justify-content: space-between; gap: 20px; align-items: start; }
.footer-links { display: flex; gap: 14px; flex-wrap: wrap; font-size: 13px; }
.disclaimer { font-size: 12px; max-width: 680px; }
.copyright { margin-top: 25px; padding-top: 15px; border-top: 1px solid var(--line); font-size: 12px; }
.reveal { animation: reveal .65s ease both; }
@keyframes reveal { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: translateY(0); } }
@media (max-width: 900px) {
  .hero-grid, .experience-grid, .article-layout { grid-template-columns: 1fr; }
  .hero { padding-top: 62px; }
  .phone-stage { order: -1; min-height: 360px; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .link-grid { grid-template-columns: repeat(2, 1fr); }
  .aside { position: static; }
}
@media (max-width: 620px) {
  .container { width: min(100% - 28px, 1160px); }
  .nav { align-items: flex-start; padding: 13px 0; flex-direction: column; }
  .nav-links { width: 100%; overflow-x: auto; flex-wrap: nowrap; }
  .nav-links a { white-space: nowrap; }
  .showcase-grid, .stats-grid, .faq-grid, .feature-grid, .link-grid { grid-template-columns: 1fr; }
  .section { padding: 55px 0; }
  .section-head { display: block; }
  .section-head p { margin-top: 12px; }
  h1 { font-size: 40px; }
  .footer-grid { display: block; }
  .footer-links { margin-top: 18px; }
}