:root {
  --color-primary: #0064e0;
  --color-primary-deep: #0457cb;
  --color-on-primary: #ffffff;
  --color-ink-button: #000000;
  --color-on-ink-button: #ffffff;
  --color-fb-blue: #1876f2;
  --color-success: #31a24c;
  --color-warning: #f7b928;
  --color-canvas: #ffffff;
  --color-surface-soft: #f1f4f7;
  --color-ink-deep: #0a1317;
  --color-ink: #1c1e21;
  --color-charcoal: #444950;
  --color-steel: #5d6c7b;
  --color-stone: #8595a4;
  --color-hairline: #ced0d4;
  --color-hairline-soft: #dee3e9;
  --rounded-lg: 8px;
  --rounded-xl: 16px;
  --rounded-xxxl: 32px;
  --rounded-full: 100px;
  --font: "Optimistic VF", system-ui, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
html { background: var(--color-surface-soft); }
body {
  margin: 0 auto;
  max-width: 390px;
  min-height: 100vh;
  font-family: var(--font);
  color: var(--color-ink);
  background: var(--color-canvas);
  line-height: 1.5;
  letter-spacing: -0.16px;
  padding-bottom: 64px;
}
a { color: var(--color-primary); text-decoration: none; }

.promo {
  background: var(--color-ink-deep);
  color: var(--color-canvas);
  font-size: 12px;
  font-weight: 700;
  text-align: center;
  padding: 10px 16px;
}
.top {
  border-bottom: 1px solid var(--color-hairline-soft);
  padding: 14px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  background: var(--color-canvas);
}
.logo {
  font-weight: 700;
  color: var(--color-ink-deep);
  font-feature-settings: "ss01", "ss02";
}
.back { font-size: 12px; color: var(--color-steel); }

.hero { padding: 28px 16px 24px; }
.hero h1 {
  font-size: 28px;
  font-weight: 500;
  line-height: 1.21;
  margin: 0 0 8px;
  color: var(--color-ink-deep);
  font-feature-settings: "ss01", "ss02";
}
.hero p { margin: 0 0 16px; color: var(--color-charcoal); font-size: 14px; }
.btn {
  display: inline-flex;
  background: var(--color-ink-button);
  color: var(--color-on-ink-button);
  font-size: 14px;
  font-weight: 700;
  padding: 12px 22px;
  border-radius: var(--rounded-full);
}
.btn:hover { text-decoration: none; color: var(--color-on-ink-button); }
.btn-buy { background: var(--color-primary); }

.block { padding: 20px 16px; border-top: 1px solid var(--color-hairline-soft); }
.block h2 {
  font-size: 15px;
  font-weight: 700;
  margin: 0 0 12px;
  color: var(--color-ink-deep);
}

.cell {
  display: block;
  border: 1px solid var(--color-hairline-soft);
  padding: 16px;
  margin-bottom: 10px;
  color: var(--color-ink);
  border-radius: var(--rounded-xl);
}
.cell:hover { text-decoration: none; }
.cell h3 { margin: 0 0 4px; font-size: 16px; font-weight: 700; }
.cell p { margin: 0; color: var(--color-charcoal); font-size: 13px; }

.row {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  padding: 12px 0;
  border-bottom: 1px solid var(--color-hairline-soft);
  font-size: 14px;
}
.row:last-child { border-bottom: 0; }
.row span { color: var(--color-steel); }

.ph {
  background: var(--color-surface-soft);
  color: var(--color-stone);
  height: 140px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  margin-bottom: 12px;
  border-radius: var(--rounded-xxxl);
}

form label { display: block; margin: 0 0 4px; font-size: 14px; font-weight: 700; }
form input, form textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--color-hairline);
  font: inherit;
  margin-bottom: 12px;
  border-radius: var(--rounded-lg);
  height: 44px;
}
form textarea { height: auto; }
form input:focus, form textarea:focus {
  outline: none;
  border: 2px solid var(--color-fb-blue);
}
form button {
  width: 100%;
  padding: 12px;
  border: 0;
  background: var(--color-primary);
  color: var(--color-on-primary);
  font: inherit;
  font-weight: 700;
  border-radius: var(--rounded-full);
  height: 44px;
}

.tab {
  position: fixed;
  left: 50%;
  bottom: 0;
  transform: translateX(-50%);
  width: 100%;
  max-width: 390px;
  display: flex;
  border-top: 1px solid var(--color-hairline-soft);
  background: var(--color-canvas);
  padding: 6px 8px 10px;
}
.tab a {
  flex: 1;
  text-align: center;
  padding: 8px 0;
  font-size: 11px;
  font-weight: 700;
  color: var(--color-steel);
  border-radius: var(--rounded-full);
}
.tab a.on {
  color: var(--color-canvas);
  background: var(--color-ink-deep);
}

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