:root {
  --bg: #ffffff;
  --bg-soft: #f7f8fa;
  --text: #14161a;
  --text-soft: #5b6470;
  --border: #e9ebef;
  --accent: #4f46e5;
  --accent-soft: #eef0ff;
  --gold: #f5b301;
  --silver: #b9c0c9;
  --bronze: #cd7f4f;
  --shadow: 0 1px 2px rgba(20,22,26,.04), 0 8px 24px rgba(20,22,26,.06);
  --radius: 14px;
  --wrap: 1080px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 20;
  background: rgba(255,255,255,.85);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: flex; align-items: baseline; gap: 8px; font-weight: 700; }
.brand-mark { color: var(--accent); font-size: 18px; }
.brand-name { font-size: 20px; letter-spacing: -.02em; }
.brand-cn { font-size: 13px; color: var(--text-soft); font-weight: 600; }
.header-actions { display: flex; align-items: center; gap: 12px; }
.lang-toggle {
  border: 1px solid var(--border); background: #fff; color: var(--text-soft);
  border-radius: 999px; padding: 7px 14px; font-size: 13px; cursor: pointer; transition: .15s;
}
.lang-toggle:hover { border-color: var(--accent); color: var(--accent); }

/* Buttons */
.btn {
  border: none; cursor: pointer; font-size: 14px; font-weight: 600;
  border-radius: 10px; padding: 10px 18px; transition: transform .12s, box-shadow .15s, background .15s;
}
.btn-primary { background: var(--accent); color: #fff; box-shadow: 0 6px 16px rgba(79,70,229,.28); }
.btn-primary:hover { background: #4338ca; }
.btn-primary:active { transform: translateY(1px); }
.btn-lg { padding: 14px 26px; font-size: 15px; }
.btn-block { width: 100%; margin-top: 8px; }
.btn-ghost { background: transparent; color: var(--text-soft); border: 1px solid var(--border); }
.btn-ghost:hover { border-color: var(--text-soft); }

/* Hero */
.hero { padding: 72px 0 40px; text-align: center; }
.hero-eyebrow { color: var(--accent); font-weight: 700; letter-spacing: .08em; font-size: 13px; text-transform: uppercase; margin: 0 0 14px; }
.hero-title { font-size: clamp(32px, 5vw, 54px); line-height: 1.1; letter-spacing: -.03em; margin: 0 0 18px; font-weight: 800; }
.hero-sub { max-width: 660px; margin: 0 auto; color: var(--text-soft); font-size: 17px; }
.hero-cta { display: flex; align-items: center; justify-content: center; gap: 16px; margin: 30px 0 8px; flex-wrap: wrap; }
.hero-price { color: var(--gold); font-weight: 700; font-size: 15px; }

.steps { list-style: none; padding: 0; margin: 48px auto 0; display: grid; grid-template-columns: repeat(3,1fr); gap: 20px; max-width: 860px; text-align: left; }
.steps li { background: var(--bg-soft); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; }
.step-no { display: inline-flex; width: 30px; height: 30px; align-items: center; justify-content: center; background: var(--accent-soft); color: var(--accent); font-weight: 800; border-radius: 8px; margin-bottom: 12px; }
.steps h3 { margin: 0 0 6px; font-size: 16px; }
.steps p { margin: 0; color: var(--text-soft); font-size: 14px; }

/* Stats */
.stats { padding: 28px 0; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); background: var(--bg-soft); }
.stats-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 16px; text-align: center; }
.stat-num { display: block; font-size: 28px; font-weight: 800; letter-spacing: -.02em; }
.stat-label { color: var(--text-soft); font-size: 13px; }

/* Board */
.board { padding: 48px 24px 64px; }
.board-head { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 22px; }
.board-head h2 { font-size: 24px; margin: 0; letter-spacing: -.02em; }
.board-hint { color: var(--text-soft); font-size: 13px; }

.leaderboard { display: flex; flex-direction: column; gap: 12px; }
.card {
  display: grid; grid-template-columns: 64px 1fr auto; align-items: center; gap: 18px;
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 18px 22px; box-shadow: var(--shadow); transition: transform .12s, box-shadow .15s;
}
.card:hover { transform: translateY(-2px); box-shadow: 0 12px 30px rgba(20,22,26,.10); }
.rank { font-size: 26px; font-weight: 800; text-align: center; color: var(--text-soft); }
.card.top1 .rank { color: var(--gold); }
.card.top2 .rank { color: var(--silver); }
.card.top3 .rank { color: var(--bronze); }
.rank .medal { font-size: 30px; display: block; }
.card-body { min-width: 0; }
.card-title { font-weight: 700; font-size: 17px; display: flex; align-items: center; gap: 8px; }
.card-title .ext { color: var(--accent); font-size: 13px; }
.card-url { color: var(--text-soft); font-size: 13px; word-break: break-all; }
.card-desc { color: var(--text-soft); font-size: 14px; margin-top: 4px; }
.card-meta { display: flex; gap: 18px; margin-top: 10px; font-size: 13px; color: var(--text-soft); }
.card-meta b { color: var(--text); font-weight: 700; }
.bid-strong { color: var(--accent); }
.card-action { display: flex; flex-direction: column; align-items: flex-end; gap: 8px; }
.bid-btn { background: var(--accent-soft); color: var(--accent); border: none; border-radius: 9px; padding: 9px 16px; font-weight: 700; font-size: 13px; cursor: pointer; }
.bid-btn:hover { background: #e2e6ff; }

/* Footer */
.site-footer { border-top: 1px solid var(--border); padding: 32px 0; color: var(--text-soft); }
.footer-brand { font-weight: 700; color: var(--text); margin: 0 0 6px; }
.footer-note { font-size: 13px; margin: 0; }

/* Modal */
.modal { position: fixed; inset: 0; z-index: 50; display: flex; align-items: center; justify-content: center; }
.modal.hidden { display: none; }
.modal-backdrop { position: absolute; inset: 0; background: rgba(20,22,26,.45); backdrop-filter: blur(2px); }
.modal-card { position: relative; background: #fff; border-radius: 18px; padding: 30px; width: min(440px, 92vw); box-shadow: 0 24px 60px rgba(0,0,0,.25); animation: pop .18s ease; }
@keyframes pop { from { transform: translateY(8px) scale(.98); opacity: 0; } to { transform: none; opacity: 1; } }
.modal-close { position: absolute; top: 14px; right: 16px; border: none; background: none; font-size: 24px; color: var(--text-soft); cursor: pointer; line-height: 1; }
.modal-card h3 { margin: 0 0 6px; font-size: 20px; }
.modal-sub { color: var(--text-soft); font-size: 14px; margin: 0 0 18px; }

.form label { display: block; font-size: 13px; font-weight: 600; margin: 14px 0 6px; }
.form input[type=url], .form input[type=text], .form input[type=number] {
  width: 100%; padding: 11px 13px; border: 1px solid var(--border); border-radius: 10px; font-size: 14px; outline: none; transition: border .15s;
}
.form input:focus { border-color: var(--accent); }
.amount-row { display: flex; flex-direction: column; gap: 10px; }
.amount-presets { display: flex; gap: 8px; flex-wrap: wrap; }
.chip { border: 1px solid var(--border); background: #fff; border-radius: 999px; padding: 6px 14px; font-size: 13px; cursor: pointer; }
.chip:hover { border-color: var(--accent); color: var(--accent); }
.form-error { color: #d6453d; font-size: 13px; margin: 10px 0 0; }
.form-error.hidden { display: none; }

/* Pay modal */
.pay-card { text-align: center; }
.pay-logo { font-size: 34px; }
.pay-amount { font-size: 34px; font-weight: 800; margin: 6px 0; letter-spacing: -.02em; }
.pay-note { color: var(--text-soft); font-size: 13px; margin: 0 0 10px; }

/* Toast */
.toast { position: fixed; bottom: 28px; left: 50%; transform: translateX(-50%); background: var(--text); color: #fff; padding: 12px 22px; border-radius: 999px; font-size: 14px; z-index: 80; box-shadow: 0 10px 30px rgba(0,0,0,.25); }
.toast.hidden { display: none; }

@media (max-width: 720px) {
  .steps { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2,1fr); }
  .card { grid-template-columns: 48px 1fr; }
  .card-action { grid-column: 1 / -1; flex-direction: row; align-items: center; justify-content: flex-start; }
  .hero { padding: 48px 0 28px; }
}