:root {
  --bg: #0b1310;
  --surface: #141f1a;
  --line: #24322c;
  --line-strong: #2c4c3e;
  --text: #eef2ef;
  --text-dim: #8aa097;
  --text-faint: #6f8a7e;
  --accent: #4fb98a;
  --radius: 14px;
  --maxw: 480px;
  --pad: 16px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, "PingFang SC", "Source Han Sans SC", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
  line-height: 1.6;
}

header, section { max-width: var(--maxw); margin: 0 auto; padding: 0 var(--pad); }

.label {
  font-size: 10px;
  letter-spacing: 3px;
  color: var(--accent);
  margin: 0 0 14px;
}

.section { padding: 36px 0; }

.muted { color: var(--text-dim); font-size: 13px; }

.hero { padding: 24px var(--pad) 40px; }
.hero-top { display: flex; justify-content: space-between; font-size: 10px;
  letter-spacing: 2px; color: var(--text-faint); padding-bottom: 12px;
  border-bottom: 1px solid var(--line); }
.badge { font-size: 10px; letter-spacing: 2px; color: var(--accent); margin: 22px 0 14px; }
.hero h1 { font-size: 30px; line-height: 1.4; font-weight: 800; letter-spacing: -.5px; margin: 0; }
.hero-sub { color: var(--text-dim); font-size: 14px; margin: 16px 0 22px; }
.hero-stats { display: flex; gap: 10px; margin-bottom: 24px; }
.stat { flex: 1; background: var(--surface); border: 1px solid var(--line);
  border-radius: 12px; padding: 14px 8px; text-align: center; }
.stat b { font-size: 22px; font-weight: 800; }
.stat span { font-size: 13px; color: var(--text-dim); }
.stat small { display: block; font-size: 9px; color: var(--text-faint); margin-top: 3px; }
.btn-primary { display: block; text-align: center; text-decoration: none;
  background: var(--accent); color: #08120d; font-weight: 700; font-size: 15px;
  border-radius: 999px; padding: 14px; }

.about-lead { font-size: 16px; font-weight: 600; margin: 0 0 12px; }
#about strong { color: var(--text); }

.overview-note { font-size: 12px; line-height: 1.7; color: var(--text-dim);
  border-left: 2px solid var(--line); padding-left: 10px; margin-top: 14px; }

.sub-group { font-size: 10px; letter-spacing: 2px; color: var(--accent); margin: 22px 0 10px; }
.sub-group.dim { color: var(--text-faint); }
.subj-row { display: flex; gap: 8px; }
.subj-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 9px; }
.subj-card { background: var(--surface); border: 1px solid var(--line);
  border-radius: 12px; padding: 12px 9px; text-align: center; color: var(--text);
  flex: 1; font: inherit; }
.subj-card b { display: block; font-size: 14px; font-weight: 700; }
.subj-card small { display: block; font-size: 9px; color: var(--text-faint); margin-top: 3px; }
.focus .subj-card { border-color: var(--line-strong); }
.subj-card.thumb { cursor: pointer; }
.subj-card .cover { display: block; height: 46px; border-radius: 7px; position: relative;
  border: 1px solid var(--line); margin-bottom: 8px;
  background: linear-gradient(155deg, #1d2c25, #101b16); }
.subj-card .cover i { position: absolute; bottom: 5px; left: 6px; font-style: normal;
  font-size: 8px; color: var(--accent); border: 1px solid var(--line-strong);
  border-radius: 3px; padding: 0 4px; }
.subj-card .detail { display: none; font-size: 10px; color: var(--text-dim); margin-top: 8px; }
.subj-card.open .detail { display: block; }

.sample-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 14px; }
.sample-grid img { width: 100%; border: 1px solid var(--line); border-radius: 10px; display: block; }

.freebie-card { background: var(--surface); border: 1px solid var(--line-strong);
  border-radius: var(--radius); padding: 24px 18px; }
.freebie-card h2 { font-size: 20px; font-weight: 800; margin: 0 0 12px; }
.freebie-card .btn-primary { margin-top: 18px; }

#diagnosis h2 { font-size: 19px; font-weight: 800; margin: 0 0 12px; }
#diagnosis strong { color: var(--accent); }

.cta { text-align: center; padding-bottom: 80px; }
.cta h2 { font-size: 19px; font-weight: 800; margin: 0 0 18px; }
.qr { width: 180px; height: 180px; border-radius: 12px; border: 1px solid var(--line);
  background: var(--surface); }
.cta-float { position: fixed; right: 16px; bottom: calc(18px + env(safe-area-inset-bottom)); z-index: 50;
  background: var(--accent); color: #08120d; font-weight: 700; font-size: 14px;
  text-decoration: none; border-radius: 999px; padding: 12px 20px;
  box-shadow: 0 6px 20px rgba(0,0,0,.4); opacity: 0; transform: translateY(12px);
  transition: opacity .25s, transform .25s; pointer-events: none; }
.cta-float.show { opacity: 1; transform: translateY(0); pointer-events: auto; }