:root {
  --color-primary: #0052ff;
  --color-primary-active: #003ecc;
  --color-ink: #0a0b0d;
  --color-body: #5b616e;
  --color-muted: #7c828a;
  --color-hairline: #dee1e6;
  --color-canvas: #ffffff;
  --color-surface-soft: #f7f7f7;
  --color-surface-strong: #eef0f3;
  --color-surface-dark: #0a0b0d;
  --color-surface-dark-elevated: #16181c;
  --color-on-primary: #ffffff;
  --color-on-dark: #ffffff;
  --color-on-dark-soft: #a8acb3;
  --color-semantic-up: #05b169;
  --color-semantic-down: #cf202f;
  --rounded-md: 12px;
  --rounded-xl: 24px;
  --rounded-pill: 100px;
  --rounded-full: 9999px;
  --font-display: "Coinbase Display", Inter, system-ui, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Coinbase Sans", Inter, system-ui, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "Coinbase Mono", ui-monospace, "Segoe UI", "PingFang SC", "Microsoft YaHei", monospace;
}

* { box-sizing: border-box; }
html { background: #e8eaee; }
body {
  margin: 0 auto;
  max-width: 390px;
  min-height: 100vh;
  font-family: var(--font-body);
  color: var(--color-ink);
  background: var(--color-canvas);
  line-height: 1.5;
  padding-bottom: 64px;
  font-size: 16px;
}
a { color: var(--color-primary); text-decoration: none; }

.top {
  height: 56px;
  padding: 0 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--color-surface-dark);
}
.logo {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 18px;
  color: var(--color-on-dark);
  letter-spacing: -0.3px;
}
.back { font-size: 12px; color: var(--color-on-dark-soft); font-weight: 500; }

.hero {
  background: var(--color-surface-dark);
  color: var(--color-on-dark);
  padding: 28px 16px 32px;
}
.hero h1 {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -0.5px;
  margin: 0 0 10px;
}
.hero p { margin: 0 0 20px; color: var(--color-on-dark-soft); font-size: 14px; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary);
  color: var(--color-on-primary);
  border: 0;
  border-radius: var(--rounded-pill);
  height: 44px;
  padding: 0 20px;
  font: 600 16px/1.15 var(--font-body);
  cursor: pointer;
}
.btn-block { display: flex; width: 100%; }

.block { padding: 20px 16px; }
.block h2 {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 400;
  margin: 0 0 14px;
  letter-spacing: -0.3px;
}

.cell {
  display: block;
  background: var(--color-canvas);
  border: 1px solid var(--color-hairline);
  border-radius: var(--rounded-xl);
  padding: 16px;
  margin-bottom: 10px;
  color: var(--color-ink);
}
.cell h3 { margin: 0 0 4px; font-size: 16px; font-weight: 600; }
.cell p { margin: 0; color: var(--color-body); font-size: 14px; }

.row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  padding: 14px 0;
  border-bottom: 1px solid var(--color-hairline);
  font-size: 14px;
}
.row:last-child { border-bottom: 0; }
.row b { font-family: var(--font-mono); font-weight: 500; font-size: 16px; }
.row span { color: var(--color-body); }
.up { color: var(--color-semantic-up); }
.down { color: var(--color-semantic-down); }

.mock {
  background: var(--color-surface-dark-elevated);
  border-radius: var(--rounded-xl);
  padding: 16px;
  margin-top: 8px;
}
.mock .row { border-color: #2a2d33; color: var(--color-on-dark); }
.mock .row span { color: var(--color-on-dark-soft); }

.ph {
  background: #e8eaee;
  color: var(--color-muted);
  height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  margin-bottom: 12px;
  border-radius: var(--rounded-xl);
}

form label { display: block; margin: 0 0 6px; font-size: 13px; font-weight: 600; }
form input, form textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--color-hairline);
  border-radius: var(--rounded-md);
  font: inherit;
  margin-bottom: 12px;
  background: var(--color-canvas);
}

.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);
  height: 56px;
}
.tab a {
  flex: 1;
  text-align: center;
  padding: 10px 0 0;
  font-size: 11px;
  font-weight: 600;
  color: var(--color-muted);
}
.tab a.on { color: var(--color-primary); }

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