:root{color-scheme:light;--bg: #f5f7fb;--surface: rgba(255, 255, 255, .78);--surface-solid: #ffffff;--text: #152033;--muted: #6b7280;--line: rgba(15, 23, 42, .08);--primary: #2563eb;--primary-strong: #1d4ed8;--danger: #ef4444;--shadow: 0 24px 80px rgba(15, 23, 42, .12);--radius-xl: 32px;--radius-lg: 22px;--bubble-font-size: 16px}html.dark{color-scheme:dark;--bg: #080b12;--surface: rgba(17, 24, 39, .76);--surface-solid: #111827;--text: #e5edf9;--muted: #9ca3af;--line: rgba(255, 255, 255, .08);--primary: #60a5fa;--primary-strong: #3b82f6;--danger: #fb7185;--shadow: 0 24px 80px rgba(0, 0, 0, .4)}*{box-sizing:border-box}html,body,#app{width:100%;min-height:100%;margin:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;background:radial-gradient(circle at top left,rgba(96,165,250,.22),transparent 32%),radial-gradient(circle at bottom right,rgba(168,85,247,.16),transparent 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#2563eb1f}.primary-btn{margin-top:6px;border:0;border-radius:18px;padding:15px 18px;color:#fff;background:linear-gradient(135deg,var(--primary),var(--primary-strong));box-shadow:0 16px 36px #2563eb47}.error-banner{margin:0;border:1px solid rgba(239,68,68,.2);border-radius:16px;padding:12px 14px;color:var(--danger);background:#ef444414}.home-tips{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}.home-tips span{padding:7px 10px;border:1px solid var(--line);border-radius:999px;color:var(--muted);font-size:12px}.chat-page{display:grid;grid-template-columns:300px 1fr;width:100%;min-height:100vh;padding:18px;gap:18px;background:radial-gradient(circle at 70% 20%,rgba(37,99,235,.12),transparent 30%),var(--bg)}.sidebar{display:flex;flex-direction:column;border:1px solid var(--line);border-radius:var(--radius-xl);background:var(--surface);box-shadow:var(--shadow);-webkit-backdrop-filter:blur(22px);backdrop-filter:blur(22px);overflow:hidden}.sidebar-head{display:flex;align-items:center;justify-content:space-between;padding:24px;border-bottom:1px solid var(--line)}.eyebrow{color:var(--primary);font-size:12px;font-weight:700;letter-spacing:.16em}.sidebar h2,.room-meta h1{margin:4px 0 0}.user-list{display:grid;gap:10px;padding:16px;overflow:auto}.user-item{display:flex;align-items:center;gap:12px;padding:12px;border:1px solid var(--line);border-radius:18px;background:#ffffff1a}.avatar,.message-avatar{display:grid;place-items:center;flex:0 0 auto;width:38px;height:38px;border-radius:14px;color:#fff;font-weight:800;background:linear-gradient(135deg,#2563eb,#7c3aed)}.user-item strong{display:block}.user-item small{color:var(--muted)}.chat-main{display:grid;grid-template-rows:auto 1fr auto;min-width:0;border:1px solid var(--line);border-radius:var(--radius-xl);background:var(--surface);box-shadow:var(--shadow);-webkit-backdrop-filter:blur(22px);backdrop-filter:blur(22px);overflow:hidden}.chat-topbar{display:flex;align-items:center;gap:14px;justify-content:space-between;padding:18px 22px;border-bottom:1px solid var(--line)}.room-meta{min-width:0;margin-right:auto}.room-meta h1{overflow:hidden;font-size:24px;text-overflow:ellipsis;white-space:nowrap}.topbar-actions{display:flex;align-items:center;gap:10px}.online-count{color:var(--muted);font-size:14px;white-space:nowrap}.font-switch{display:flex;padding:4px;border:1px solid var(--line);border-radius:999px}.font-switch button,.theme-btn,.leave-btn,.icon-btn{border:0;color:var(--text);background:transparent}.font-switch button{min-width:34px;height:32px;border-radius:999px;color:var(--muted)}.font-switch button.active{color:#fff;background:var(--primary)}.theme-btn,.leave-btn,.icon-btn{min-width:42px;height:42px;border:1px solid var(--line);border-radius:15px;background:var(--surface-solid)}.leave-btn{padding:0 14px;color:var(--danger)}.message-list{display:flex;flex-direction:column;gap:14px;min-height:0;padding:22px;overflow:auto}.message-row{display:flex;align-items:flex-start;gap:10px;max-width:78%}.message-row.mine{align-self:flex-end;flex-direction:row-reverse}.message-row.system{align-self:center;max-width:100%}.message-content{min-width:0}.message-info{display:flex;gap:8px;align-items:center;margin:0 0 6px;color:var(--muted);font-size:12px}.message-row.mine .message-info{justify-content:flex-end}.bubble{padding:13px 15px;border:1px solid var(--line);border-radius:20px 20px 20px 6px;background:var(--surface-solid);box-shadow:0 8px 30px #0f172a14;font-size:var(--bubble-font-size);line-height:1.7;white-space:pre-wrap;overflow-wrap:anywhere}.message-row.mine .bubble{border-radius:20px 20px 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