:root {
  --color-primary: #0f62fe;
  --color-on-primary: #ffffff;
  --color-ink: #161616;
  --color-ink-muted: #525252;
  --color-ink-subtle: #8c8c8c;
  --color-canvas: #ffffff;
  --color-surface-1: #f4f4f4;
  --color-hairline: #e0e0e0;
  --color-inverse-canvas: #161616;
  --font-sans: "IBM Plex Sans", "Helvetica Neue", Arial, system-ui, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --rounded-none: 0px;
}

* { box-sizing: border-box; }
html { background: var(--color-surface-1); }
body {
  margin: 0 auto;
  max-width: 390px;
  min-height: 100vh;
  font-family: var(--font-sans);
  color: var(--color-ink);
  background: var(--color-canvas);
  line-height: 1.5;
  font-size: 16px;
  letter-spacing: 0.16px;
  padding-bottom: 64px;
}
a { color: var(--color-primary); text-decoration: none; }

.top {
  height: 48px;
  padding: 0 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--color-hairline);
}
.logo { font-weight: 400; color: var(--color-ink); }
.back { font-size: 12px; color: var(--color-ink-subtle); letter-spacing: 0.32px; }

.hero {
  padding: 24px 16px 32px;
  background: linear-gradient(180deg, rgba(15,98,254,0.06), var(--color-canvas) 80%);
}
.hero h1 {
  font-size: 32px;
  font-weight: 300;
  line-height: 1.2;
  letter-spacing: 0;
  margin: 0 0 8px;
}
.hero p { margin: 0; color: var(--color-ink-muted); font-size: 14px; }

.block { padding: 16px; border-bottom: 1px solid var(--color-hairline); }
.block h2 {
  font-size: 14px;
  font-weight: 400;
  color: var(--color-ink-muted);
  margin: 0 0 12px;
}

.cell {
  display: block;
  border: 1px solid var(--color-hairline);
  padding: 16px;
  margin-bottom: 0;
  color: var(--color-ink);
  border-radius: var(--rounded-none);
  border-bottom: 0;
}
.cell:last-of-type { border-bottom: 1px solid var(--color-hairline); }
.cell h3 { margin: 0 0 4px; font-size: 16px; font-weight: 400; }
.cell p { margin: 0; color: var(--color-ink-muted); font-size: 14px; }

.row {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  padding: 16px 0;
  border-bottom: 1px solid var(--color-hairline);
  font-size: 14px;
}
.row:last-child { border-bottom: 0; }
.row span { color: var(--color-ink-subtle); font-size: 12px; letter-spacing: 0.32px; }

.ph {
  background: var(--color-surface-1);
  color: var(--color-ink-subtle);
  height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  margin-bottom: 12px;
}

form label { display: block; margin: 0 0 4px; font-size: 14px; }
form input, form textarea {
  width: 100%;
  padding: 11px 16px;
  border: 0;
  border-bottom: 1px solid var(--color-ink);
  background: var(--color-surface-1);
  font-family: var(--font-sans);
  margin-bottom: 12px;
  border-radius: 0;
}
form button {
  width: 100%;
  min-height: 48px;
  padding: 12px 16px;
  border: 0;
  background: var(--color-primary);
  color: var(--color-on-primary);
  font-family: var(--font-sans);
  font-size: 14px;
  letter-spacing: 0.16px;
  border-radius: 0;
}

.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: 12px 0;
  font-size: 11px;
  color: var(--color-ink-muted);
  letter-spacing: 0.16px;
}
.tab a.on {
  color: var(--color-primary);
  font-weight: 600;
  box-shadow: inset 0 2px 0 var(--color-primary);
}

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