:root {
  --bg: #05081a;
  --bg-deep: #030916;
  --panel: #0b1226;
  --panel-2: #0e1730;
  --line: rgba(161, 231, 208, 0.16);
  --text: #e2ebf8;
  --muted: #8892aa;
  --teal: #a1e7d0;
  --gold: #f4c64e;
  --radius: 14px;
  --max: 1120px;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: radial-gradient(1200px 600px at 50% -10%, #0c1a33 0%, var(--bg) 55%, var(--bg-deep) 100%);
  color: var(--text);
  font: 16px/1.75 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  min-height: 100vh;
}
a { color: var(--teal); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; height: auto; }
.wrap { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 24px; }

.site-header {
  position: sticky; top: 0; z-index: 20;
  backdrop-filter: blur(12px);
  background: rgba(3, 9, 22, 0.82);
  border-bottom: 1px solid var(--line);
}
.site-header .wrap { display: flex; align-items: center; gap: 28px; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); font-weight: 700; letter-spacing: .04em; }
.brand:hover { text-decoration: none; }
.brand img { width: 30px; height: 30px; border-radius: 8px; }
.site-nav { display: flex; gap: 22px; margin-left: auto; font-size: 15px; }
.site-nav a { color: var(--muted); }
.site-nav a.active, .site-nav a:hover { color: var(--text); text-decoration: none; }

main { display: block; }
.section { padding: 72px 0; }
.section.tight { padding: 44px 0; }

.hero { padding: 96px 0 64px; text-align: center; }
.hero h1 { font-size: clamp(34px, 6vw, 58px); margin: 0 0 18px; letter-spacing: .04em; }
.hero .tagline { font-size: clamp(17px, 2.4vw, 22px); color: var(--teal); margin: 0 0 14px; }
.hero p { color: var(--muted); max-width: 680px; margin: 0 auto 32px; }
.hero-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 26px; border-radius: 999px; border: 1px solid var(--line);
  color: var(--text); background: rgba(161, 231, 208, .08);
  font-size: 15px; transition: .18s ease;
}
.btn:hover { background: rgba(161, 231, 208, .16); text-decoration: none; transform: translateY(-1px); }
.btn.primary { background: var(--gold); border-color: var(--gold); color: #1a1200; font-weight: 700; }
.btn.primary:hover { background: #ffd766; }
.btn.disabled { color: var(--muted); background: rgba(136, 146, 170, .1); border-color: rgba(136, 146, 170, .2); cursor: not-allowed; }
.btn.disabled:hover { transform: none; background: rgba(136, 146, 170, .1); }

.screens { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.screens-note { margin: 0 0 18px; color: var(--muted); font-size: 14px; line-height: 1.7; }
.screens figure { margin: 0; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: var(--panel); }
.screens img { display: block; width: 100%; }
.screens figcaption { padding: 12px 16px; color: var(--muted); font-size: 14px; border-top: 1px solid var(--line); }

.features { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-top: 28px; }
.feature { padding: 22px; border: 1px solid var(--line); border-radius: var(--radius); background: linear-gradient(180deg, var(--panel-2), var(--panel)); }
.feature h3 { margin: 0 0 8px; font-size: 17px; color: var(--teal); }
.feature p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.7; }

.page-head { padding: 64px 0 20px; }
.page-head h1 { font-size: clamp(28px, 4vw, 40px); margin: 0 0 12px; }
.page-head p { color: var(--muted); margin: 0; max-width: 760px; }

.notice {
  margin: 24px 0 8px; padding: 18px 22px;
  border: 1px solid rgba(244, 198, 78, .28); border-left: 3px solid var(--gold);
  border-radius: 10px; background: rgba(244, 198, 78, .06); color: #f0e6c8; font-size: 14px;
}
.notice strong { color: var(--gold); }

.works { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; margin-top: 28px; }
.work { padding: 22px; border: 1px solid var(--line); border-radius: var(--radius); background: linear-gradient(180deg, var(--panel-2), var(--panel)); }
.work-head { display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; }
.work h2 { font-size: 20px; margin: 0; }
.badge { font-size: 12px; padding: 2px 10px; border-radius: 999px; border: 1px solid rgba(161, 231, 208, .35); color: var(--teal); background: rgba(161, 231, 208, .08); }
.work .meta { color: var(--muted); font-size: 13px; margin: 6px 0 14px; }
.work audio { width: 100%; height: 40px; filter: invert(.92) hue-rotate(120deg); }
.work .no-audio { color: var(--muted); font-size: 14px; padding: 10px 0; }
.work .cert { margin-top: 14px; }
.work .cert img { width: 120px; border-radius: 8px; border: 1px solid var(--line); }
.text-link { display: inline-flex; margin-top: 14px; color: var(--gold); font-weight: 700; text-decoration: none; }
.text-link:hover { text-decoration: underline; }
.no-certificate { display: inline-block; margin-top: 14px; color: var(--muted); font-size: 13px; }
.certificate-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; margin-top: 28px; }
.certificate-card { scroll-margin-top: 90px; padding: 20px; border: 1px solid var(--line); border-radius: var(--radius); background: linear-gradient(180deg, var(--panel-2), var(--panel)); }
.certificate-head { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.certificate-head h2 { margin: 0; font-size: 20px; }
.certificate-card .meta { color: var(--muted); font-size: 13px; margin: 6px 0 14px; }
.certificate-card > a:first-of-type { display: block; overflow: hidden; border: 1px solid var(--line); border-radius: 10px; background: #fff; }
.certificate-card img { display: block; width: 100%; height: auto; transition: transform .2s ease; }
.certificate-card > a:first-of-type:hover img { transform: scale(1.01); }
.certificate-card .text-link { font-size: 13px; }

.legal { max-width: 860px; padding-bottom: 80px; }
.legal h1 { font-size: clamp(26px, 4vw, 36px); margin: 0 0 20px; }
.legal h2 { font-size: 21px; margin: 38px 0 12px; padding-bottom: 8px; border-bottom: 1px solid var(--line); color: var(--teal); }
.legal h3 { font-size: 17px; margin: 26px 0 10px; color: var(--gold); }
.legal p { margin: 0 0 14px; color: #cfd8e8; }
.legal ul, .legal ol { margin: 0 0 16px; padding-left: 22px; color: #cfd8e8; }
.legal li { margin: 6px 0; }
.legal strong { color: var(--text); }
.legal code { background: rgba(161, 231, 208, .1); padding: 1px 6px; border-radius: 4px; font-size: .92em; }

.about-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; margin-top: 28px; }
.about-card { padding: 22px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); }
.about-card h3 { margin: 0 0 10px; font-size: 15px; color: var(--muted); font-weight: 500; }
.about-card p { margin: 0; font-size: 16px; word-break: break-all; }

.site-footer { border-top: 1px solid var(--line); padding: 34px 0 44px; color: var(--muted); font-size: 13px; }
.site-footer .wrap { display: flex; flex-wrap: wrap; gap: 10px 26px; align-items: center; }
.site-footer a { color: var(--muted); }
.site-footer a:hover { color: var(--text); }
.site-footer .links { display: flex; gap: 18px; margin-left: auto; flex-wrap: wrap; }

@media (max-width: 900px) {
  .features { grid-template-columns: repeat(2, 1fr); }
  .works { grid-template-columns: 1fr; }
  .certificate-grid { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .section { padding: 48px 0; }
  .hero { padding: 64px 0 40px; }
  .screens { grid-template-columns: 1fr; }
  .features { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 1fr; }
  .certificate-card { padding: 14px; }
  .site-header .wrap { height: 58px; gap: 14px; }
  .site-nav { gap: 14px; font-size: 14px; }
  .site-footer .links { margin-left: 0; }
}