:root{
  --bg:#f6f7fb; --card:#ffffff; --text:#1f2330; --muted:#6b7280;
  --primary:#6366f1; --primary-d:#4f46e5; --border:#e6e8ef; --danger:#ef4444;
}
*{box-sizing:border-box;}
[hidden]{display:none !important;}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  background:var(--bg);color:var(--text);line-height:1.6;}
.demo-banner{background:#fff7e6;color:#92400e;padding:8px 16px;font-size:13px;text-align:center;border-bottom:1px solid #fde68a;}
.demo-banner a{color:#b45309;}
.topbar{position:sticky;top:0;z-index:10;display:flex;align-items:center;gap:16px;
  padding:12px 20px;background:rgba(255,255,255,.9);backdrop-filter:blur(8px);border-bottom:1px solid var(--border);}
.brand{font-weight:700;font-size:18px;white-space:nowrap;}
.nav-tabs{display:flex;gap:6px;flex:1;flex-wrap:wrap;}
.tab{border:none;background:transparent;color:var(--muted);padding:6px 12px;border-radius:999px;cursor:pointer;font-size:14px;}
.tab.active{background:var(--primary);color:#fff;}
.auth-area{display:flex;align-items:center;gap:8px;}
.user-chip{font-size:14px;color:var(--text);background:#eef0fb;padding:4px 8px 4px 4px;border-radius:999px;display:inline-flex;align-items:center;gap:6px;cursor:pointer;}
.user-chip:hover{background:#e3e6f7;}
.avatar{display:inline-flex;align-items:center;justify-content:center;border-radius:50%;color:#fff;font-weight:700;flex:none;line-height:1;}
.av-xs{width:22px;height:22px;font-size:12px;}
.av-sm{width:28px;height:28px;font-size:13px;margin-right:6px;}
.detail-meta .avatar{margin-right:6px;vertical-align:middle;}
.answer-head .avatar{margin-right:0;}
.answer-head b{margin-right:4px;}
.container{max-width:880px;margin:24px auto;padding:0 16px;}
.toolbar{display:flex;gap:10px;margin-bottom:16px;}
.search{flex:1;padding:10px 14px;border:1px solid var(--border);border-radius:10px;font-size:14px;background:var(--card);}
.btn{border:none;border-radius:10px;padding:10px 16px;font-size:14px;cursor:pointer;font-weight:600;}
.btn-primary{background:var(--primary);color:#fff;}
.btn-primary:hover{background:var(--primary-d);}
.btn-ghost{background:transparent;color:var(--text);border:1px solid var(--border);}
.btn-ghost:hover{background:#f0f1f6;}
.btn-sm{padding:6px 12px;font-size:13px;}
.btn-block{width:100%;margin-top:8px;}
.danger{color:var(--danger);}
.posts-list{display:flex;flex-direction:column;gap:12px;}
.card{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:16px;cursor:pointer;transition:.15s;}
.card:hover{box-shadow:0 4px 18px rgba(0,0,0,.06);transform:translateY(-1px);}
.badge{display:inline-block;color:#fff;font-size:12px;padding:2px 10px;border-radius:999px;margin-bottom:8px;}
.card-title{margin:6px 0;font-size:17px;}
.card-excerpt{color:var(--muted);font-size:14px;margin:4px 0 10px;}
.card-foot{display:flex;align-items:center;gap:10px;flex-wrap:wrap;font-size:12px;color:var(--muted);}
.card-author{font-weight:600;color:var(--text);}
.pill{background:#f0f1f6;padding:2px 8px;border-radius:999px;}
.detail-title{margin:8px 0 4px;font-size:22px;}
.detail-meta{color:var(--muted);font-size:13px;margin-bottom:12px;}
.detail-body{white-space:pre-wrap;font-size:15px;}
.file-download{display:inline-block;margin-top:12px;color:var(--primary);text-decoration:none;font-weight:600;}
.answers-title{margin-top:24px;font-size:16px;}
.answer{border:1px solid var(--border);border-radius:12px;padding:12px;margin-bottom:10px;background:var(--card);}
.answer-accepted{border-color:#10b981;background:#f0fdf4;}
.answer-head{display:flex;align-items:center;gap:8px;font-size:13px;margin-bottom:6px;}
.answer-head .card-time{color:var(--muted);}
.accepted{color:#10b981;font-weight:600;}
.answer-body{font-size:14px;white-space:pre-wrap;}
.answer-actions{margin-top:6px;display:flex;gap:12px;}
.link{background:none;border:none;color:var(--primary);cursor:pointer;font-size:13px;padding:0;}
.link-danger{background:none;border:none;color:var(--danger);cursor:pointer;font-size:13px;padding:0;}
.answer-form{margin-top:14px;display:flex;flex-direction:column;gap:8px;}
.answer-form textarea,.input{width:100%;border:1px solid var(--border);border-radius:10px;padding:10px 12px;font-size:14px;font-family:inherit;background:var(--card);}
.answer-form textarea{resize:vertical;}
.modal{position:fixed;inset:0;background:rgba(15,18,30,.45);display:flex;align-items:center;justify-content:center;z-index:50;padding:16px;}
.modal-card{background:var(--card);border-radius:16px;padding:24px;width:100%;max-width:440px;position:relative;}
.modal-close{position:absolute;top:12px;right:14px;border:none;background:none;font-size:22px;cursor:pointer;color:var(--muted);}
.modal-card h2{margin:0 0 14px;font-size:19px;}
.seg{display:flex;gap:8px;margin-bottom:14px;}
.seg-btn{flex:1;border:1px solid var(--border);background:transparent;border-radius:10px;padding:8px;cursor:pointer;font-size:14px;}
.seg-btn.active{background:var(--primary);color:#fff;border-color:var(--primary);}
.input{margin-bottom:10px;}
.file-label{display:block;font-size:13px;color:var(--muted);margin-bottom:10px;}
.file-label input{margin-top:6px;}
.msg{color:var(--danger);font-size:13px;min-height:18px;margin:6px 0 0;}
.empty,.loading{padding:40px 0;text-align:center;color:var(--muted);}
.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:#1f2330;color:#fff;padding:10px 18px;border-radius:10px;font-size:14px;z-index:100;box-shadow:0 6px 20px rgba(0,0,0,.2);}
.toast.show{animation:pop .2s ease;}
@keyframes pop{from{opacity:0;transform:translate(-50%,8px);}to{opacity:1;transform:translate(-50%,0);}}
@media(max-width:600px){.brand{font-size:16px;}.toolbar{flex-direction:column;}}

/* 连接状态徽标 */
.mode-badge{font-size:12px;padding:4px 10px;border-radius:999px;white-space:nowrap;}
.mode-badge.ok{background:#e7f7ee;color:#0a7d44;}
.mode-badge.warn{background:#fff3e0;color:#9a5b00;}

/* 卡片操作：点赞 / 收藏 */
.card-actions{display:flex;gap:10px;margin-top:12px;}
.act-btn{border:1px solid var(--border);background:#fff;border-radius:999px;padding:5px 12px;font-size:13px;cursor:pointer;color:var(--muted);transition:.15s;display:inline-flex;align-items:center;gap:4px;}
.act-btn:hover{border-color:var(--primary);color:var(--primary);}
.act-btn.active{background:#fff0f0;border-color:#fca5a5;color:#e23b3b;}
.act-btn.active.bm{background:#eef2ff;border-color:#a5b4fc;color:#4338ca;}

/* Markdown 渲染 */
.detail-body code,.answer-body code{background:#f1f3f9;padding:1px 6px;border-radius:5px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.92em;}
.detail-body a,.answer-body a{color:var(--primary);}