:root {
  --red: #d32f2f; --green: #2e7d32; --ink: #1a1a1a; --muted: #6b7280;
  --line: #e5e7eb; --bg: #f5f6f8; --card: #fff; --brand: #b8860b;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, "Helvetica Neue", Arial, "PingFang SC",
    "Microsoft YaHei", sans-serif;
  font-size: 15px; line-height: 1.6; color: var(--ink); background: var(--bg);
  -webkit-text-size-adjust: 100%;
}
a { color: var(--brand); text-decoration: none; }
.container { max-width: 920px; margin: 0 auto; padding: 16px; }
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: 10px;
  padding: 16px; margin: 12px 0; box-shadow: 0 1px 3px rgba(0,0,0,.04);
}
.btn {
  display: inline-block; padding: 10px 18px; border-radius: 8px; border: 0;
  background: var(--brand); color: #fff; font-size: 15px; cursor: pointer;
}
.btn.secondary { background: #eef0f3; color: var(--ink); }
.btn.danger { background: var(--red); }
.btn:disabled { opacity: .5; cursor: not-allowed; }
input, select {
  width: 100%; padding: 10px 12px; border: 1px solid var(--line);
  border-radius: 8px; font-size: 16px; background: #fff;
}
label { display: block; font-size: 13px; color: var(--muted); margin: 10px 0 4px; }
.error { color: var(--red); font-size: 14px; margin: 8px 0; }
.ok { color: var(--green); }
.muted { color: var(--muted); }
.up { color: var(--red); } .down { color: var(--green); }
.row { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
.spacer { flex: 1; }

/* 顶部导航 */
.nav {
  position: sticky; top: 0; z-index: 10; background: #fff;
  border-bottom: 1px solid var(--line);
}
.nav .inner { max-width: 920px; margin: 0 auto; padding: 10px 16px;
  display: flex; align-items: center; gap: 16px; }
.nav .brand { font-weight: 800; color: var(--ink); }
.nav a.link { color: var(--muted); font-size: 14px; }
.nav a.link.active { color: var(--ink); font-weight: 700; }

/* 落地页 */
.hero { text-align: center; padding: 56px 16px 32px; }
.hero h1 { font-size: 30px; margin: 0 0 12px; }
.hero p { color: var(--muted); font-size: 17px; max-width: 620px; margin: 0 auto 24px; }
.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.feature h3 { margin: 4px 0; font-size: 16px; }
.feature p { color: var(--muted); font-size: 14px; margin: 0; }

/* 列表 */
.stock-item { display: flex; align-items: center; gap: 10px; padding: 10px 0;
  border-bottom: 1px solid var(--line); }
.stock-item:last-child { border-bottom: 0; }
.pill { font-size: 12px; padding: 2px 8px; border-radius: 999px; background: #eef0f3; color: var(--muted); }
.group-title { font-weight: 700; margin: 16px 0 4px; }

table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 8px 6px; border-bottom: 1px solid var(--line); }

/* 手机端 */
@media (max-width: 560px) {
  .features { grid-template-columns: 1fr; }
  .hero h1 { font-size: 24px; }
  .container { padding: 12px; }
  .nav .inner { gap: 10px; overflow-x: auto; }
}