:root{--bg: #f5f7fa;--card: #ffffff;--line: #e3e8ef;--text: #1f2937;--muted: #6b7280;--primary: #2563eb;--ok: #059669;--warn: #d97706}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,Microsoft YaHei,sans-serif;font-size:14px}.center{min-height:100vh;display:flex;align-items:center;justify-content:center}.muted{color:var(--muted)}.small{font-size:12px}.error{color:#dc2626;margin:8px 0}.toast{margin-top:8px;color:var(--primary)}.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:16px 18px;margin-bottom:16px}.auth{width:360px}.auth h1{font-size:20px;margin:0 0 16px}.auth label{display:block;margin-bottom:12px;color:var(--muted)}input,select,textarea{width:100%;padding:8px 10px;border:1px solid var(--line);border-radius:8px;font:inherit;background:#fff;color:inherit}textarea{margin-top:8px;resize:vertical}button{padding:8px 14px;border:1px solid var(--line);border-radius:8px;background:#fff;cursor:pointer;font:inherit}button:hover{border-color:var(--primary);color:var(--primary)}button.primary{background:var(--primary);color:#fff;border-color:var(--primary);width:100%;margin-top:8px}button.primary:hover{filter:brightness(1.05);color:#fff}button.link{border:none;color:var(--muted);padding:2px 4px}button.tab{flex:1}button.tab.active{background:var(--primary);color:#fff;border-color:var(--primary)}.tabs{display:flex;gap:8px;margin-bottom:16px}.layout header{display:flex;justify-content:space-between;align-items:center;padding:12px 24px;background:#fff;border-bottom:1px solid var(--line)}.layout header .right{display:flex;align-items:center;gap:12px}main{display:grid;grid-template-columns:1fr 1fr;gap:16px;padding:16px 24px 48px;max-width:1280px;margin:0 auto}h2{font-size:15px;margin:0 0 12px}.row{display:flex;align-items:center;gap:8px}.row.between{justify-content:space-between}.row.offline{opacity:.6}.classroom-list,.shout-list{list-style:none;margin:0;padding:0}.classroom-list li{display:flex;align-items:center;justify-content:space-between;padding:6px 0;border-bottom:1px dashed var(--line)}.classroom-list input[type=checkbox]{width:auto}.classroom-list .name{font-weight:600}.dot{width:8px;height:8px;border-radius:50%;display:inline-block}.dot.on{background:var(--ok)}.dot.off{background:#d1d5db}.chips{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:12px}.chip{border-radius:999px;padding:6px 12px}.chip.active{background:var(--primary);color:#fff;border-color:var(--primary)}.shout-list li{padding:10px 0;border-bottom:1px dashed var(--line)}.shout-list p{margin:4px 0}.badge{font-size:12px;padding:2px 8px;border-radius:999px;border:1px solid var(--line)}.badge.ok{color:var(--ok);border-color:var(--ok)}.badge.info{color:var(--primary);border-color:var(--primary)}.badge.warn{color:var(--warn);border-color:var(--warn)}.badge.muted{color:var(--muted)}