:root {
  --ink: #121826;
  --muted: #5d697c;
  --soft: #f4f7fb;
  --panel: #ffffff;
  --line: #dbe3ee;
  --blue: #1264d8;
  --blue-dark: #0f51b0;
  --green: #0b8f7a;
  --amber: #f59e0b;
  --amber-deep: #d97706;
  --dark: #182235;
  --shadow: 0 18px 42px rgba(18, 24, 38, .12);
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--soft);
  line-height: 1.7;
}
a { color: inherit; text-decoration: none; }
img, video { display: block; max-width: 100%; }
.container { width: min(1180px, calc(100% - 40px)); margin: 0 auto; }

.header {
  position: sticky; top: 0; z-index: 30;
  background: rgba(255,255,255,.94);
  border-bottom: 1px solid rgba(219,227,238,.86);
  backdrop-filter: blur(12px);
}
.header .container { display: grid; grid-template-columns: auto 1fr; align-items: center; gap: 24px; padding: 12px 0; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 900; }
.brand img { height: 32px; width: auto; object-fit: contain; }
.nav { display: flex; justify-content: flex-end; gap: 20px; color: var(--muted); font-size: 15px; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--blue); }

.btn { display: inline-flex; align-items: center; justify-content: center; min-height: 42px; padding: 0 16px; border: 1px solid transparent; border-radius: 6px; font-weight: 900; cursor: pointer; }
.btn.primary { color: #fff; background: var(--blue); }
.btn.primary:hover { background: var(--blue-dark); }
.btn.buy { color: #1f2937; background: linear-gradient(135deg, #fbbf24, var(--amber)); box-shadow: 0 8px 18px rgba(245,158,11,.4); }
.btn.buy:hover { background: linear-gradient(135deg, var(--amber), var(--amber-deep)); color: #1f2937; }
.btn.dark { color: #fff; background: var(--dark); }
.btn.light { color: var(--blue); background: #edf5ff; border-color: #cfe0f7; }
.btn.line { color: var(--ink); background: #fff; border-color: var(--line); }
.btn:hover { box-shadow: 0 12px 24px rgba(18,24,38,.13); transform: translateY(-1px); }

.hero { padding: 70px 0 44px; background: linear-gradient(120deg, rgba(18,100,216,.1), transparent 36%), linear-gradient(180deg, #ffffff 0%, #eef5f8 100%); }
.hero-grid { display: grid; grid-template-columns: minmax(0,.95fr) minmax(420px,1.05fr); align-items: center; gap: 48px; }
.eyebrow { margin: 0 0 10px; color: var(--green); font-size: 14px; font-weight: 900; }
h1, h2, h3, p { margin-top: 0; }
h1 { margin-bottom: 18px; font-size: clamp(40px, 5.4vw, 60px); line-height: 1.1; }
h2 { margin-bottom: 12px; font-size: clamp(28px, 4vw, 42px); line-height: 1.18; }
h3 { margin-bottom: 8px; font-size: 20px; line-height: 1.32; }
.lead { max-width: 680px; color: #39465a; font-size: 19px; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 28px 0 22px; }
.hero-points { display: flex; flex-wrap: wrap; gap: 10px; padding: 0; margin: 0 0 22px; list-style: none; }
.hero-points li { padding: 8px 11px; border: 1px solid var(--line); border-radius: 6px; background: rgba(255,255,255,.76); color: #3d4a5e; font-weight: 800; }
/* Hero media frame: 实拍画面 + 时间戳 + REC/播放 */
.hero-media { position: relative; border: 1px solid var(--line); border-radius: 12px; overflow: hidden; background: #000; box-shadow: var(--shadow); }
.hero-media img { width: 100%; height: auto; display: block; }
.hero-media figcaption { position: absolute; left: 0; right: 0; bottom: 0; display: flex; justify-content: space-between; gap: 12px; padding: 20px 14px 12px; color: #fff; font-size: 13px; background: linear-gradient(transparent, rgba(0,0,0,.55)); }
.media-rec { position: absolute; top: 12px; left: 12px; display: inline-flex; align-items: center; gap: 7px; padding: 5px 11px; border-radius: 999px; background: rgba(0,0,0,.5); color: #fff; font-size: 12px; font-weight: 900; letter-spacing: .6px; }
.media-rec::before { content: ""; width: 9px; height: 9px; border-radius: 50%; background: #ef4444; animation: recpulse 1.4s infinite; }
@keyframes recpulse { 0% { box-shadow: 0 0 0 0 rgba(239,68,68,.6);} 70% { box-shadow: 0 0 0 9px rgba(239,68,68,0);} 100% { box-shadow: 0 0 0 0 rgba(239,68,68,0);} }
.media-play { position: absolute; top: 46%; left: 50%; transform: translate(-50%,-50%); width: 64px; height: 64px; border-radius: 50%; background: linear-gradient(135deg, var(--blue), #06b6d4); box-shadow: 0 10px 28px rgba(0,0,0,.4); transition: .18s ease; }
.media-play:hover { transform: translate(-50%,-50%) scale(1.07); }
.media-play::before { content: ""; position: absolute; top: 50%; left: 54%; transform: translate(-50%,-50%); border-style: solid; border-width: 12px 0 12px 19px; border-color: transparent transparent transparent #fff; }

.section { padding: 72px 0; }
.section.white { background: #fff; }
.section-head { max-width: 820px; margin: 0 auto 32px; text-align: center; }
.section-head p:not(.eyebrow) { color: var(--muted); font-size: 18px; }

.quick-grid, .feature-grid, .trust-grid, .scene-grid { display: grid; gap: 16px; }
.quick-grid { grid-template-columns: repeat(4, minmax(0,1fr)); }
.feature-grid { grid-template-columns: repeat(3, minmax(0,1fr)); }
.trust-grid { grid-template-columns: repeat(4, minmax(0,1fr)); }
.scene-grid { grid-template-columns: repeat(3, minmax(0,1fr)); }
.card { padding: 22px; border: 1px solid var(--line); border-radius: 8px; background: var(--panel); }
.card p { color: var(--muted); margin-bottom: 0; }
.card strong { color: var(--ink); }
.num { display: inline-flex; align-items: center; justify-content: center; width: 42px; height: 30px; margin-bottom: 14px; border-radius: 6px; color: #fff; background: var(--blue); font-weight: 900; }
.tag { display: inline-flex; margin-bottom: 12px; padding: 4px 9px; border-radius: 6px; color: #784708; background: #fff0d6; font-size: 13px; font-weight: 900; }
.mini-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.mini-actions a { padding: 7px 10px; border-radius: 6px; color: #fff; background: var(--blue); font-size: 14px; font-weight: 900; }

/* Answer-first cards (利于用户和 AI/搜索直接抓答案) */
.answer-grid { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 16px; max-width: 960px; margin: 0 auto 28px; }
.answer-card { min-height: 220px; padding: 22px; border: 1px solid rgba(18,100,216,.18); border-radius: 8px; background: #fff; box-shadow: 0 10px 24px rgba(18,24,38,.06); }
.answer-card h2 { margin-bottom: 8px; font-size: 22px; line-height: 1.25; }
.answer-card p { margin-bottom: 8px; color: var(--muted); }
.answer-card p:last-child { margin-bottom: 0; }
.answer-card a { color: var(--blue); font-weight: 900; overflow-wrap: anywhere; }
.answer-main { color: var(--blue) !important; font-size: 34px; line-height: 1.1; font-weight: 900; }

/* 合规条 */
.compliance { margin-top: 18px; padding: 14px 18px; border: 1px solid #fcd9b6; border-radius: 8px; background: #fff7ec; color: #9a4a08; font-size: 14px; }

.demo-grid { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 20px; }
.video-frame { padding: 14px; border: 1px solid var(--line); border-radius: 8px; background: #fff; box-shadow: var(--shadow); }
.video-frame video { width: 100%; aspect-ratio: 16 / 9; border-radius: 6px; background: #111827; object-fit: contain; }
.video-frame figcaption { padding-top: 10px; color: var(--muted); font-size: 14px; text-align: center; }

.versions { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 20px; }
.version { overflow: hidden; border: 1px solid var(--line); border-radius: 8px; background: #fff; }
.version.featured { border-color: rgba(18,100,216,.36); box-shadow: var(--shadow); }
.version img { width: 100%; height: 220px; object-fit: cover; object-position: top left; background: #eef2f7; }
.version-body { padding: 24px; }
.price { margin: 8px 0 8px; color: var(--blue); font-size: 34px; font-weight: 900; }
.price small { font-size: 15px; color: var(--muted); font-weight: 700; }
.version ul { min-height: 130px; padding-left: 20px; color: #3f4b5d; }

.tutorial-steps { display: grid; grid-template-columns: repeat(4, minmax(0,1fr)); gap: 16px; }
.step-card { padding: 22px; border: 1px solid var(--line); border-radius: 8px; background: #fff; }
.step-card .num { background: #eef5ff; color: var(--blue); width: 40px; height: 40px; border-radius: 50%; font-size: 18px; }

.official-band { display: grid; grid-template-columns: auto minmax(0,1fr) auto; align-items: center; gap: 18px; margin-top: 18px; padding: 18px 20px; border: 1px solid rgba(18,100,216,.22); border-radius: 8px; background: #fff; }
.official-band strong { color: var(--blue); font-size: 20px; }
.official-band span { color: var(--muted); }

.faq-list { max-width: 960px; margin: 0 auto; }
.faq-list details { border: 1px solid var(--line); border-radius: 8px; background: #fff; }
.faq-list details + details { margin-top: 12px; }
.faq-list summary { padding: 18px 20px; cursor: pointer; font-weight: 900; }
.faq-list p { margin: 0; padding: 0 20px 20px; color: var(--muted); }

.cta { padding: 44px; border-radius: 8px; color: #fff; background: linear-gradient(120deg, #182235, #164a83); }
.cta p { color: rgba(255,255,255,.78); }

.footer { padding: 34px 0 92px; background: #edf2f7; color: #4f5b6d; }
.footer .container { display: flex; justify-content: space-between; gap: 24px; }
.footer-links { display: flex; flex-wrap: wrap; gap: 14px; font-weight: 800; }

.sticky { position: fixed; left: 50%; bottom: 16px; z-index: 40; display: grid; grid-template-columns: auto auto auto; align-items: center; gap: 14px; width: min(920px, calc(100% - 32px)); padding: 12px 14px; border-radius: 8px; color: #fff; background: rgba(24,34,53,.96); box-shadow: 0 18px 42px rgba(18,24,38,.28); transform: translateX(-50%); }
.sticky span { color: rgba(255,255,255,.74); font-size: 14px; }
.sticky a { justify-self: end; padding: 8px 14px; border-radius: 6px; color: #132037; background: #fff; font-weight: 900; }

.page-hero { padding: 54px 0 32px; background: linear-gradient(180deg, #fff, #eef5f8); }
.crumb { color: var(--muted); font-size: 14px; margin-bottom: 10px; }
.crumb a { color: var(--muted); }
.page-hero h1 { max-width: 1100px; font-size: clamp(36px, 4.5vw, 52px); line-height: 1.16; }
.page-hero p { max-width: 760px; color: var(--muted); font-size: 18px; }
.page-hero + .section { padding-top: 56px; }
.prose { max-width: 880px; margin: 0 auto; }
.prose h2 { margin: 30px 0 12px; }
.prose p, .prose li { color: #3f4b5d; }

@media (max-width: 980px) {
  .header .container { grid-template-columns: 1fr; gap: 10px; }
  .nav { position: static; display: flex; flex-wrap: wrap; justify-content: flex-start; gap: 8px 16px; padding: 0; background: transparent; border: 0; box-shadow: none; }
  .hero-grid, .demo-grid, .official-band { grid-template-columns: 1fr; }
  .quick-grid, .feature-grid, .trust-grid, .scene-grid, .tutorial-steps { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .versions { grid-template-columns: 1fr; }
}
@media (max-width: 620px) {
  .container { width: min(100% - 32px, 1180px); }
  .hero { padding-top: 42px; }
  h1 { font-size: 34px; }
  .page-hero { padding: 38px 0 26px; }
  .page-hero h1 { font-size: 34px; }
  .lead { font-size: 17px; }
  .quick-grid, .feature-grid, .trust-grid, .scene-grid, .tutorial-steps, .answer-grid { grid-template-columns: 1fr; }
  .answer-card { min-height: auto; }
  .footer .container { flex-direction: column; }
  .footer { padding-bottom: 178px; }
  .sticky { grid-template-columns: 1fr; gap: 6px; bottom: 10px; }
  .sticky a { justify-self: stretch; text-align: center; }
}