:root {
  color-scheme: light dark;
  --bg: #f6f3ec;
  --paper: #fffcf6;
  --ink: #1f2a2e;
  --muted: #5f6b72;
  --body: #3b474d;
  --line: #e2dccf;
  --accent: #2f7d6d;
  --accent-soft: #e3efe9;
  --dew: #d3e7e8;
  --button: #1f2a2e;
  --button-ink: #ffffff;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141a1b;
    --paper: #1c2324;
    --ink: #eef1ef;
    --muted: #9aa6a6;
    --body: #c9d1cf;
    --line: #2c3536;
    --accent: #7cc4b2;
    --accent-soft: #1f3330;
    --dew: #1d3436;
    --button: #eef1ef;
    --button-ink: #141a1b;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Hiragino Sans GB", "Segoe UI", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
}

a { color: var(--accent); }

.wrap { max-width: 1080px; margin: 0 auto; padding: 0 40px; }

/* header / footer */
.nav { display: flex; align-items: center; justify-content: space-between; padding: 22px 0; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font-weight: 650; font-size: 17px; letter-spacing: .01em; }
.drop { width: 20px; height: 20px; border-radius: 50% 50% 50% 0; transform: rotate(-45deg); background: linear-gradient(135deg, #bfe0dc, var(--accent)); flex: none; }
.links { display: flex; align-items: center; gap: 24px; font-size: 15px; }
.links a { color: var(--muted); text-decoration: none; }
.links a:hover { color: var(--ink); }
.links .lang { color: var(--ink); border: 1px solid var(--line); border-radius: 999px; padding: 2px 11px; }
.foot { display: flex; flex-wrap: wrap; gap: 8px 24px; justify-content: space-between; padding: 28px 0 36px; border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; }
.foot a { color: inherit; text-decoration: none; }

/* home */
.hero { padding: 56px 0 36px; max-width: 720px; }
.hero h1 { font-size: 46px; line-height: 1.15; margin: 0 0 16px; letter-spacing: -.01em; }
.hero p { font-size: 18px; line-height: 1.7; color: var(--muted); margin: 0; }
.section-title { padding: 20px 0 10px; font-size: 13px; font-weight: 700; letter-spacing: .1em; color: var(--accent); text-transform: uppercase; }
.apps { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 18px; padding: 8px 0 64px; }
.card { background: var(--paper); border: 1px solid var(--line); border-radius: 18px; padding: 24px; display: flex; flex-direction: column; gap: 12px; color: inherit; text-decoration: none; transition: transform .15s ease, box-shadow .15s ease; }
.card:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,.08); }
.card img { width: 64px; height: 64px; border-radius: 15px; }
.card h3 { margin: 4px 0 0; font-size: 21px; }
.card .tag { color: var(--accent); font-size: 14px; margin-top: -6px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; line-height: 1.6; flex: 1; }
.chips { display: flex; gap: 8px; flex-wrap: wrap; }
.chip { font-size: 12px; padding: 3px 9px; border-radius: 999px; background: var(--accent-soft); color: var(--accent); }

/* app page */
.app-hero { display: grid; grid-template-columns: 1fr 1.15fr; gap: 48px; padding: 48px 0 48px; align-items: center; }
.app-hero-bg { background: radial-gradient(circle at 80% 15%, var(--dew), transparent 60%); }
.app-icon { width: 96px; height: 96px; border-radius: 22px; box-shadow: 0 6px 18px rgba(0,0,0,.15); }
.app-hero h1 { font-size: 52px; line-height: 1.1; margin: 18px 0 6px; }
.app-hero .sub { font-size: 22px; color: var(--accent); margin: 0 0 18px; }
.app-hero p { color: var(--muted); font-size: 17px; line-height: 1.75; margin: 0 0 24px; }
.store { display: inline-flex; align-items: center; gap: 8px; background: var(--button); color: var(--button-ink); padding: 12px 20px; border-radius: 12px; font-size: 15px; font-weight: 600; text-decoration: none; }
.platforms { color: var(--muted); font-size: 13px; margin-top: 12px; }
.shot { width: 100%; height: auto; border-radius: 20px; border: 1px solid var(--line); box-shadow: 0 12px 36px rgba(0,0,0,.10); display: block; }
.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; padding: 8px 0 40px; }
.feature { background: var(--paper); border: 1px solid var(--line); border-radius: 16px; padding: 22px; }
.feature h2 { margin: 0 0 8px; font-size: 17px; }
.feature p { margin: 0; color: var(--muted); font-size: 14.5px; line-height: 1.65; }
.app-links { display: flex; flex-wrap: wrap; gap: 12px; padding: 0 0 56px; }
.app-links a { color: var(--accent); text-decoration: none; border: 1px solid var(--line); background: var(--paper); border-radius: 12px; padding: 10px 16px; font-size: 15px; }

/* document pages */
.doc { max-width: 760px; margin: 0 auto; padding: 40px 0 64px; }
.crumb { font-size: 14px; color: var(--muted); margin-bottom: 14px; }
.crumb a { text-decoration: none; }
.doc h1 { font-size: 40px; line-height: 1.2; margin: 0 0 8px; }
.doc .updated { color: var(--muted); font-size: 14px; margin: 0 0 28px; }
.doc h2 { font-size: 20px; line-height: 1.35; margin: 32px 0 8px; }
.doc p, .doc li { color: var(--body); line-height: 1.8; }
.doc p { margin: 0 0 12px; }
.doc ul { padding-left: 1.3em; margin: 0 0 12px; }
.doc strong { color: var(--ink); }
.contact { background: var(--accent-soft); border-radius: 14px; padding: 18px 20px; margin: 28px 0 0; color: var(--body); }
.contact a { font-weight: 600; }

@media (max-width: 760px) {
  .wrap { padding: 0 16px; }
  .links { gap: 14px; font-size: 14px; }
  .hero { padding-top: 32px; }
  .hero h1 { font-size: 34px; }
  .app-hero { grid-template-columns: 1fr; gap: 32px; padding-top: 28px; }
  .app-hero h1 { font-size: 40px; }
  .features { grid-template-columns: 1fr; }
  .doc { padding-top: 24px; }
  .doc h1 { font-size: 32px; }
}

.reveal { font: inherit; color: var(--accent); background: var(--accent-soft); border: 1px solid var(--line); border-radius: 999px; padding: 2px 12px; cursor: pointer; }
.reveal:hover { border-color: var(--accent); }