:root {
  --color-primary: #0a0a0a;
  --color-on-primary: #ffffff;
  --color-brand-green: #00d4a4;
  --color-brand-green-deep: #00b48a;
  --color-hero-sky-from: #87a8c8;
  --color-hero-sky-to: #f5e9d8;
  --color-testimonial-orange: #f55a3c;
  --color-canvas: #ffffff;
  --color-surface: #f7f7f7;
  --color-surface-code: #1c1c1e;
  --color-hairline: #e5e5e5;
  --color-ink: #0a0a0a;
  --color-steel: #5a5a5c;
  --color-stone: #888888;
  --rounded-md: 8px;
  --rounded-lg: 12px;
  --rounded-full: 9999px;
  --font: Inter, system-ui, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "Geist Mono", ui-monospace, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }
html { background: var(--color-surface); }
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;
  padding-bottom: 64px;
}
a { color: var(--color-ink); text-decoration: none; }

.top {
  border-bottom: 1px solid var(--color-hairline);
  padding: 14px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--color-canvas);
}
.logo { font-weight: 600; color: var(--color-ink); }
.back { font-size: 12px; color: var(--color-steel); }

.hero {
  padding: 32px 16px 24px;
  background: linear-gradient(180deg, var(--color-hero-sky-from), var(--color-hero-sky-to));
}
.hero h1 {
  font-size: 28px;
  font-weight: 600;
  letter-spacing: -0.8px;
  line-height: 1.15;
  margin: 0 0 8px;
}
.hero p { margin: 0 0 16px; color: var(--color-steel); font-size: 14px; }
.btn {
  display: inline-flex;
  background: var(--color-brand-green);
  color: var(--color-primary);
  font-size: 14px;
  font-weight: 500;
  padding: 10px 20px;
  border-radius: var(--rounded-full);
}
.btn:hover { text-decoration: none; color: var(--color-primary); }
.btn-dark { background: var(--color-primary); color: #fff; }

.block { padding: 16px; border-top: 1px solid var(--color-hairline); }
.block h2 { font-size: 15px; font-weight: 600; margin: 0 0 12px; }

.cell {
  display: block;
  border: 1px solid var(--color-hairline);
  padding: 12px;
  margin-bottom: 8px;
  color: var(--color-ink);
  border-radius: var(--rounded-lg);
}
.cell:hover { text-decoration: none; }
.cell h3 { margin: 0 0 4px; font-size: 15px; }
.cell p { margin: 0; color: var(--color-steel); font-size: 13px; }
.cell.featured { border: 2px solid var(--color-brand-green); }

.row {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  padding: 10px 0;
  border-bottom: 1px solid var(--color-hairline);
  font-size: 14px;
}
.row:last-child { border-bottom: 0; }
.row span { color: var(--color-steel); }

.ph {
  background: var(--color-surface);
  color: var(--color-stone);
  height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  margin-bottom: 12px;
  border-radius: var(--rounded-lg);
}
.code {
  background: var(--color-surface-code);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 12px;
  border-radius: var(--rounded-md);
}

form label { display: block; margin: 0 0 4px; font-size: 14px; }
form input, form textarea {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--color-hairline);
  font: inherit;
  margin-bottom: 12px;
  border-radius: var(--rounded-md);
  height: 44px;
}
form textarea { height: auto; }
form input:focus { outline: none; border: 2px solid var(--color-brand-green); }
form button {
  width: 100%;
  padding: 12px;
  border: 0;
  background: var(--color-primary);
  color: #fff;
  font: inherit;
  font-weight: 500;
  border-radius: var(--rounded-full);
}

.tab {
  position: fixed;
  left: 50%;
  bottom: 0;
  transform: translateX(-50%);
  width: 100%;
  max-width: 390px;
  display: flex;
  border-top: 1px solid var(--color-hairline);
  background: var(--color-canvas);
  padding: 6px 8px 10px;
}
.tab a {
  flex: 1;
  text-align: center;
  padding: 8px 0;
  font-size: 11px;
  font-weight: 500;
  color: var(--color-steel);
  border-radius: var(--rounded-full);
}
.tab a.on { color: var(--color-primary); background: var(--color-brand-green); }

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