:root {
  --color-primary: #0066cc;
  --color-primary-on-dark: #2997ff;
  --color-ink: #1d1d1f;
  --color-body-muted: #cccccc;
  --color-ink-muted-80: #333333;
  --color-ink-muted-48: #7a7a7a;
  --color-hairline: #e0e0e0;
  --color-canvas: #ffffff;
  --color-canvas-parchment: #f5f5f7;
  --color-surface-tile-1: #272729;
  --color-surface-black: #000000;
  --color-on-primary: #ffffff;
  --color-on-dark: #ffffff;
  --font-display: "SF Pro Display", system-ui, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-text: "SF Pro Text", system-ui, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --rounded-sm: 8px;
  --rounded-lg: 18px;
  --rounded-pill: 9999px;
  --product-shadow: rgba(0, 0, 0, 0.22) 3px 5px 30px 0;
}

* { box-sizing: border-box; }
html { background: #111; }
body {
  margin: 0 auto;
  max-width: 390px;
  min-height: 100vh;
  font-family: var(--font-text);
  color: var(--color-ink);
  background: var(--color-canvas);
  line-height: 1.47;
  padding-bottom: 56px;
  font-size: 17px;
  letter-spacing: -0.374px;
}
a { color: var(--color-primary); text-decoration: none; }

.top {
  background: var(--color-surface-black);
  padding: 0 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 44px;
  position: sticky;
  top: 0;
  z-index: 10;
}
.logo { font-weight: 400; color: var(--color-on-dark); font-size: 17px; }
.back { font-size: 12px; color: var(--color-body-muted); }

.hero, .tile { padding: 48px 16px; text-align: center; }
.hero { background: var(--color-canvas); }
.tile-dark { background: var(--color-surface-tile-1); color: var(--color-on-dark); }
.tile-parchment { background: var(--color-canvas-parchment); }
.hero h1, .tile h1 {
  font-family: var(--font-display);
  font-size: 28px; font-weight: 600; line-height: 1.1;
  letter-spacing: -0.28px; margin: 0 0 8px;
}
.hero p, .tile p { margin: 0 0 16px; font-size: 17px; color: var(--color-ink-muted-80); }
.tile-dark p { color: var(--color-body-muted); }
.tile-dark a { color: var(--color-primary-on-dark); }

.block { padding: 16px; }
.block h2 { font-family: var(--font-display); font-size: 21px; font-weight: 600; margin: 0 0 12px; }

.cell {
  display: block; color: var(--color-ink);
  background: var(--color-canvas); border-radius: var(--rounded-lg);
  padding: 16px; margin-bottom: 12px;
  border: 1px solid var(--color-hairline);
}
.cell:hover { text-decoration: none; }
.cell h3 { margin: 0 0 4px; font-size: 17px; font-weight: 600; }
.cell p { margin: 0; color: var(--color-ink-muted-80); font-size: 14px; }

.row {
  display: flex; justify-content: space-between; gap: 8px;
  padding: 14px 0; border-bottom: 1px solid var(--color-hairline); font-size: 17px;
}
.row:last-child { border-bottom: 0; }
.row span { color: var(--color-ink-muted-48); font-size: 14px; }

.ph {
  background: var(--color-canvas-parchment); color: var(--color-ink-muted-48);
  height: 140px; display: flex; align-items: center; justify-content: center;
  font-size: 13px; margin: 16px auto 0; border-radius: var(--rounded-sm);
  box-shadow: var(--product-shadow);
}
.tile-dark .ph { background: #1a1a1c; }

.btn {
  display: inline-flex; padding: 8px 16px;
  background: var(--color-primary); color: var(--color-on-primary);
  border-radius: var(--rounded-pill); font-size: 14px;
}
.btn:hover { text-decoration: none; color: var(--color-on-primary); }

form label { display: block; margin: 0 0 4px; font-size: 14px; }
form input, form textarea {
  width: 100%; padding: 12px 20px; border: 1px solid var(--color-hairline);
  border-radius: var(--rounded-pill); font: inherit; margin-bottom: 12px;
}
form textarea { border-radius: var(--rounded-lg); }
form button {
  width: 100%; padding: 12px; border: 0;
  background: var(--color-primary); color: var(--color-on-primary);
  font: inherit; border-radius: var(--rounded-pill);
}

.tab {
  position: fixed; left: 50%; bottom: 0; transform: translateX(-50%);
  width: 100%; max-width: 390px;
  display: flex; background: rgba(245,245,247,0.92);
  backdrop-filter: blur(20px);
  border-top: 1px solid var(--color-hairline);
}
.tab a { flex: 1; text-align: center; padding: 10px 0; font-size: 10px; color: var(--color-ink-muted-48); }
.tab a.on { color: var(--color-primary); font-weight: 600; }

.ph { overflow: hidden; }
.ph img { width: 100%; height: 100%; object-fit: cover; display: block; }