:root {
  --bg:#f7f8fa; --card:#fff; --ink:#1c2530; --muted:#7b8898;
  --accent:#8d1c2a; --accent-soft:#f7e9eb; --up:#a4202e; --down:#227b65;
  --line:#e5e9ef; --grid:#eef1f5;
}
*{box-sizing:border-box}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--ink);font-size:14px;line-height:1.6}
header{background:#fff;border-bottom:1px solid var(--line);padding:14px 28px;display:flex;align-items:baseline;justify-content:space-between;position:sticky;top:0;z-index:10}
.brand{display:flex;align-items:baseline;gap:10px}
.brand b{font-size:17px;color:var(--accent);letter-spacing:1px}
.brand span{color:var(--muted);font-size:13px}
header small{color:var(--muted);font-size:12px}
nav{background:#fff;border-bottom:1px solid var(--line);padding:0 28px;display:flex;gap:4px}
nav a{padding:10px 14px;color:var(--muted);text-decoration:none;font-size:13px;border-bottom:2px solid transparent}
nav a.active{color:var(--accent);border-bottom-color:var(--accent);font-weight:600}
main{max-width:1180px;margin:0 auto;padding:24px 28px 60px}
.heading h1{margin:0 0 4px;font-size:22px}
.heading p{color:var(--muted);font-size:12.5px;margin:0 0 18px}
.alert{display:none;background:#fff8e1;border:1px solid #ffe082;color:#8d6e00;padding:10px 14px;border-radius:8px;margin-bottom:16px;font-size:13px}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px;margin-bottom:20px}
.card{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:14px 16px}
.card .name{font-size:12px;color:var(--muted)}
.card .value{font-size:22px;font-weight:650;font-variant-numeric:tabular-nums;margin:4px 0 2px}
.card .value small{font-size:12px;color:var(--muted);font-weight:400}
.card .meta{font-size:11.5px;color:#9aa7b6}
section h2{font-size:16px;margin:22px 0 10px}
.table-wrap{overflow-x:auto}
table{width:100%;border-collapse:collapse;background:#fff;border:1px solid var(--line);border-radius:10px;font-size:12.5px}
th,td{padding:8px 12px;text-align:left;border-bottom:1px solid var(--grid)}
th{background:#fafbfc;color:var(--muted);font-weight:600;position:sticky;top:0}
td{font-variant-numeric:tabular-nums}
.chart-section{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:16px 18px;margin-bottom:16px}
.chart-head{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;flex-wrap:wrap}
.chart-head h2{margin:0;font-size:15px}
.chart-subtitle{color:var(--muted);font-size:12px;margin:2px 0 0}
.chart-tools{display:flex;align-items:center;gap:12px}
.chart-legend{display:flex;gap:10px;font-size:12px;color:var(--muted);flex-wrap:wrap}
.legend i{display:inline-block;width:10px;height:10px;border-radius:2px;margin-right:4px}
.range-switch{display:flex;background:#f2f4f7;border-radius:6px;padding:2px;gap:2px}
.range-switch button{border:none;background:transparent;color:var(--muted);font-size:11.5px;padding:4px 9px;border-radius:5px;cursor:pointer}
.range-switch button.active{background:#fff;color:var(--ink);box-shadow:0 1px 2px rgba(0,0,0,.08);font-weight:600}
.chart-scroll{overflow-x:auto;margin-top:8px}
.chart-svg{display:block}
.chart-svg .grid{stroke:var(--grid)}
.chart-svg .axis{font-size:10px;fill:var(--muted)}
.chart-svg .axis-line{stroke:#c9d2dc}
.chart-svg .line{fill:none;stroke-width:1.8}
.chart-svg .hover-line{stroke:#8d1c2a;stroke-width:1;stroke-dasharray:3 2;display:none}
.chart-readout{min-height:20px;font-size:12.5px;color:var(--ink);margin-top:6px}
.chart-readout span{margin-right:14px;white-space:nowrap}
.chart-readout i{display:inline-block;width:9px;height:9px;border-radius:2px;margin-right:4px}
.chart-foot{font-size:11.5px;color:var(--muted);margin-top:4px}
.chart-tooltip{position:fixed;z-index:99;background:#1c2530;color:#fff;font-size:12px;padding:8px 10px;border-radius:6px;pointer-events:none;box-shadow:0 4px 14px rgba(0,0,0,.2);line-height:1.8}
.chart-tooltip span{margin-right:10px;white-space:nowrap}
.chart-tooltip i{display:inline-block;width:9px;height:9px;border-radius:2px;margin-right:4px}
.table-note,.method-note p,.risk-note p{color:var(--muted);font-size:12px;margin:8px 4px 18px}
.method-note,.risk-note{background:#fff;border:1px solid var(--line);border-radius:10px;padding:14px 18px;margin-bottom:16px}
.method-note h2,.risk-note h2{font-size:13.5px;margin:0 0 6px}
.price-up{color:var(--up);font-weight:650}
.price-down{color:var(--down);font-weight:650}

/* ---- 登录/注册 ---- */
.auth-bar{display:flex;align-items:center;gap:8px;margin-right:16px}
.auth-user{font-size:12.5px;color:var(--muted)}
.btn{display:inline-block;padding:5px 12px;border:1px solid var(--accent);background:var(--accent);color:#fff;border-radius:6px;font-size:12.5px;cursor:pointer;text-decoration:none;line-height:1.5}
.btn:hover{opacity:.9}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--line)}
.btn-ghost:hover{background:#f2f4f7;opacity:1}
.modal-mask{position:fixed;inset:0;background:rgba(20,28,38,.45);display:flex;align-items:center;justify-content:center;z-index:50}
.modal{background:#fff;border-radius:12px;padding:24px 28px;width:min(360px,90vw);box-shadow:0 8px 30px rgba(0,0,0,.18)}
.modal h3{margin:0 0 16px;font-size:17px}
.modal input{width:100%;padding:9px 12px;margin-bottom:10px;border:1px solid var(--line);border-radius:6px;font-size:13.5px;box-sizing:border-box}
.modal input:focus{outline:none;border-color:var(--accent)}
.modal-msg{font-size:12.5px;color:var(--accent);min-height:18px;margin-bottom:4px}
.modal-actions{display:flex;gap:10px;margin-top:6px}
.modal-actions .btn{flex:1;text-align:center}
.modal-switch{font-size:12.5px;color:var(--muted);margin:14px 0 0}
.modal-switch a{color:var(--accent);cursor:pointer}