:root{--bg:#f8fafc;--card:#fff;--text:#1e293b;--muted:#64748b;--primary:#2563eb;--primary-d:#1d4ed8;--danger:#dc2626;--border:#e2e8f0;--user:#eef2ff;--ai:#f0fdf4;--tip:#b45309}
@media (prefers-color-scheme:dark){:root{--bg:#0f172a;--card:#1e293b;--text:#e2e8f0;--muted:#94a3b8;--border:#334155;--user:#1e2a4a;--ai:#14301f;--tip:#fbbf24;--primary:#3b82f6;--primary-d:#2563eb}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--text);line-height:1.75}
.wrap{max-width:760px;margin:0 auto;padding:0 18px}
a{color:var(--primary)}
.site-header{background:var(--card);border-bottom:1px solid var(--border)}
.site-header .wrap{display:flex;flex-wrap:wrap;gap:8px 20px;align-items:center;justify-content:space-between;padding-top:12px;padding-bottom:12px}
.brand{font-weight:700;font-size:18px;text-decoration:none;color:var(--text)}
.site-header nav a,.site-footer nav a{margin-right:16px;text-decoration:none;color:var(--muted);font-size:14px}
.site-header nav a:hover,.site-footer nav a:hover{color:var(--primary)}
main{max-width:760px;margin:0 auto;padding:24px 18px 40px}
h1{font-size:28px;line-height:1.3;margin:8px 0 12px}
h2{font-size:21px;margin:32px 0 10px}
h3{font-size:17px;margin:22px 0 6px}
p{margin:10px 0}
.lead{color:var(--muted);font-size:17px}
.card{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:18px;margin:18px 0}
.controls{display:flex;flex-wrap:wrap;gap:12px;align-items:center;justify-content:space-between;margin-bottom:14px}
select,input[type=password],input[type=text]{font:inherit;padding:6px 10px;border:1px solid var(--border);border-radius:8px;background:var(--bg);color:var(--text)}
button{font:inherit;cursor:pointer}
.btn-ghost{background:none;border:1px solid var(--border);border-radius:8px;padding:5px 12px;color:var(--muted)}
.btn-ghost:hover{color:var(--text)}
#record-btn{width:100%;padding:18px;font-size:18px;border:none;border-radius:12px;background:var(--primary);color:#fff}
#record-btn:hover{background:var(--primary-d)}
#record-btn.recording{background:var(--danger)}
#record-btn:disabled{background:#94a3b8;cursor:not-allowed}
#status{color:var(--muted);margin:10px 0 0;font-size:14px;min-height:22px}
#status.error{color:var(--danger)}
#replay-btn{display:none;margin-top:8px}
.msg{padding:10px 14px;margin:10px 0;border-radius:12px;white-space:pre-wrap;line-height:1.6}
.msg.user{background:var(--user);text-align:right}
.msg.ai{background:var(--ai)}
.tip{color:var(--tip);font-size:14px;margin-top:6px}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin:8px 0}
.chip{border:1px solid var(--border);background:var(--bg);color:var(--text);border-radius:999px;padding:4px 12px;font-size:14px}
.chip.active{background:var(--primary);color:#fff;border-color:var(--primary)}
#hints{margin:10px 0 0;padding:10px 14px;border-left:3px solid var(--primary);background:var(--bg);border-radius:6px;font-size:15px}
#hints ul{margin:4px 0 0;padding-left:20px}
.gate{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.gate input{flex:1;min-width:160px}
.gate button{background:var(--primary);color:#fff;border:none;border-radius:8px;padding:7px 16px}
.steps{padding-left:20px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px}
.grid a.tile{display:block;text-decoration:none;color:var(--text);background:var(--card);border:1px solid var(--border);border-radius:12px;padding:14px 16px}
.grid a.tile:hover{border-color:var(--primary)}
.tile strong{display:block;margin-bottom:4px}
.tile span{color:var(--muted);font-size:14px}
details{border-bottom:1px solid var(--border);padding:10px 0}
summary{cursor:pointer;font-weight:600}
table{border-collapse:collapse;width:100%;margin:12px 0;font-size:15px}
th,td{border:1px solid var(--border);padding:8px 10px;text-align:left;vertical-align:top}
th{background:var(--bg)}
.dialog p{margin:6px 0}
.dialog .who{font-weight:700}
.meta{color:var(--muted);font-size:14px}
.site-footer{border-top:1px solid var(--border);background:var(--card);padding:18px 0;color:var(--muted);font-size:13px}
.site-footer p{margin:8px 0 0}
.good{color:#15803d}.bad{color:var(--danger)}