:root {
  --color-primary: #171717;
  --color-on-primary: #ffffff;
  --color-ink: #171717;
  --color-body: #4d4d4d;
  --color-mute: #888888;
  --color-hairline: #ebebeb;
  --color-canvas: #ffffff;
  --color-canvas-soft: #fafafa;
  --color-canvas-soft-2: #f5f5f5;
  --color-link: #0070f3;
  --color-gradient-develop-start: #007cf0;
  --color-gradient-develop-end: #00dfd8;
  --color-gradient-preview-start: #7928ca;
  --color-gradient-preview-end: #ff0080;
  --color-gradient-ship-start: #ff4d4d;
  --color-gradient-ship-end: #f9cb28;
  --rounded-sm: 6px;
  --rounded-md: 8px;
  --rounded-pill: 100px;
  --font: Geist, Inter, system-ui, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "Geist Mono", ui-monospace, Menlo, system-ui, "Segoe UI", "PingFang SC", "Microsoft YaHei", monospace;
  --shadow-card: 0 0 0 1px #00000014 inset, 0px 2px 2px #0000000a;
}

* { box-sizing: border-box; }
html { background: var(--color-canvas-soft-2); }
body {
  margin: 0 auto;
  max-width: 390px;
  min-height: 100vh;
  font-family: var(--font);
  color: var(--color-ink);
  background: var(--color-canvas-soft);
  line-height: 1.45;
  padding-bottom: 64px;
}
a { color: var(--color-link); text-decoration: none; }

.top {
  background: var(--color-canvas);
  padding: 14px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}
.logo { font-weight: 600; color: var(--color-ink); letter-spacing: -0.4px; }
.back { font-size: 12px; color: var(--color-mute); font-family: var(--font-mono); }

.hero {
  padding: 32px 16px 40px;
  text-align: center;
  background:
    radial-gradient(closest-side at 20% 20%, var(--color-gradient-develop-start), transparent 70%),
    radial-gradient(closest-side at 80% 30%, var(--color-gradient-preview-end), transparent 70%),
    radial-gradient(closest-side at 50% 80%, var(--color-gradient-ship-end), transparent 70%),
    var(--color-canvas);
}
.hero h1 {
  font-size: 28px;
  font-weight: 600;
  letter-spacing: -1.28px;
  line-height: 32px;
  margin: 0 0 8px;
}
.hero p { margin: 0; color: var(--color-body); font-size: 14px; }

.block { padding: 16px; }
.block.dark { background: var(--color-primary); color: var(--color-on-primary); }
.block h2 { font-size: 20px; font-weight: 600; letter-spacing: -0.6px; margin: 0 0 12px; }

.cell {
  display: block;
  background: var(--color-canvas);
  border-radius: var(--rounded-md);
  padding: 16px;
  margin-bottom: 8px;
  color: var(--color-ink);
  box-shadow: var(--shadow-card);
}
.cell h3 { margin: 0 0 4px; font-size: 16px; font-weight: 600; }
.cell p { margin: 0; color: var(--color-body); font-size: 13px; }

.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-mute); font-family: var(--font-mono); font-size: 12px; }

.ph {
  background: var(--color-canvas-soft-2);
  color: var(--color-mute);
  height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  margin-bottom: 12px;
  border-radius: var(--rounded-md);
}

form label { display: block; margin: 0 0 4px; font-size: 14px; }
form input, form textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--color-hairline);
  border-radius: var(--rounded-sm);
  font: inherit;
  margin-bottom: 12px;
  background: var(--color-canvas);
}
form button {
  width: 100%;
  height: 48px;
  border: 0;
  background: var(--color-primary);
  color: var(--color-on-primary);
  font: inherit;
  font-weight: 500;
  border-radius: var(--rounded-pill);
}

.tab {
  position: fixed;
  left: 50%;
  bottom: 0;
  transform: translateX(-50%);
  width: 100%;
  max-width: 390px;
  display: flex;
  background: var(--color-canvas);
  border-top: 1px solid var(--color-hairline);
}
.tab a {
  flex: 1;
  text-align: center;
  padding: 10px 0 12px;
  font-size: 11px;
  font-weight: 500;
  color: var(--color-body);
}
.tab a.on { color: var(--color-ink); }

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