:root {
  --bg: #ffffff;
  --bg-soft: #f7f7f8;
  --text: #1a1a1a;
  --text-soft: #666;
  --border: #e5e5e5;
  --accent: #0066ff;
  --accent-hover: #0052cc;
  --error: #d33;
  --ok: #16a34a;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html, body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  line-height: 1.6;
}
.page {
  max-width: 480px;
  margin: 0 auto;
  padding: 60px 24px;
}
.page-wide {
  max-width: 720px;
  margin: 0 auto;
  padding: 60px 24px;
}
header {
  border-bottom: 1px solid var(--border);
  padding: 16px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.brand {
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.02em;
}
.nav a {
  margin-left: 16px;
  color: var(--text-soft);
  text-decoration: none;
  font-size: 14px;
}
.nav a:hover { color: var(--text); }
h1 {
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 8px;
}
h2 {
  font-size: 22px;
  font-weight: 600;
  margin-top: 32px;
  margin-bottom: 12px;
}
.lede {
  color: var(--text-soft);
  font-size: 16px;
  margin-bottom: 32px;
}
form { margin-top: 24px; }
label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 6px;
  color: var(--text-soft);
}
input[type="text"], input[type="email"], input[type="password"], input[type="number"] {
  width: 100%;
  padding: 12px 14px;
  font-size: 15px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  margin-bottom: 16px;
  outline: none;
  transition: border-color .15s;
}
input:focus { border-color: var(--accent); }
.btn {
  display: inline-block;
  padding: 12px 20px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  transition: background .15s;
}
.btn:hover { background: var(--accent-hover); }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn-block { display: block; width: 100%; text-align: center; }
.btn-secondary { background: var(--bg-soft); color: var(--text); border: 1px solid var(--border); }
.btn-secondary:hover { background: #ececee; }
.muted { color: var(--text-soft); font-size: 13px; }
.muted a { color: var(--accent); text-decoration: none; }
.notice {
  padding: 12px 14px;
  border-radius: 8px;
  margin: 16px 0;
  font-size: 14px;
}
.notice-error { background: #fee; color: var(--error); border: 1px solid #fcc; }
.notice-ok { background: #efe; color: var(--ok); border: 1px solid #cfc; }
.notice-info { background: #eef; color: #336; border: 1px solid #ccf; }
.card {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 16px;
  background: var(--bg);
}
.kv { display: flex; justify-content: space-between; padding: 8px 0; }
.kv-label { color: var(--text-soft); }
.kv-value { font-weight: 600; }
.balance-big {
  font-size: 42px;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin: 12px 0;
}
.hero {
  text-align: center;
  padding: 80px 24px 40px;
}
.hero h1 { font-size: 48px; line-height: 1.1; margin-bottom: 16px; }
.hero p { color: var(--text-soft); font-size: 17px; max-width: 480px; margin: 0 auto 32px; }
.hero .cta-row { display: flex; gap: 12px; justify-content: center; }
.features {
  max-width: 920px;
  margin: 40px auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
}
.feature h3 { font-size: 16px; font-weight: 600; margin-bottom: 4px; }
.feature p { color: var(--text-soft); font-size: 14px; }
.row { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.spacer-y { height: 16px; }
footer {
  text-align: center;
  padding: 32px 24px;
  color: var(--text-soft);
  font-size: 13px;
  border-top: 1px solid var(--border);
  margin-top: 80px;
}