:root{--bg: #f5f7fb;--panel: #ffffff;--border: #e5e8ef;--primary: #3b6ef5;--primary-dark: #2b56cc;--text: #1f2430;--muted: #7a8194;--user-bubble: #3b6ef5;--bot-bubble: #ffffff;--ok: #16a34a;--warn: #d97706;--danger: #dc2626;--shadow: 0 2px 10px rgba(20, 30, 60, .06)}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;background:var(--bg);color:var(--text);font-size:14px}a{color:var(--primary);text-decoration:none}button{font-family:inherit;cursor:pointer}.btn{border:1px solid var(--border);background:#fff;color:var(--text);border-radius:8px;padding:8px 14px;font-size:14px;transition:all .15s}.btn:hover{border-color:var(--primary);color:var(--primary)}.btn.primary{background:var(--primary);color:#fff;border-color:var(--primary)}.btn.primary:hover{background:var(--primary-dark);color:#fff}.btn.danger{color:var(--danger);border-color:#f0c7c7}.btn.danger:hover{background:var(--danger);color:#fff}.btn:disabled{opacity:.5;cursor:not-allowed}.btn.sm{padding:4px 10px;font-size:13px}.input,.select,.textarea{width:100%;border:1px solid var(--border);border-radius:8px;padding:8px 10px;font-size:14px;font-family:inherit;background:#fff;color:var(--text)}.input:focus,.select:focus,.textarea:focus{outline:none;border-color:var(--primary)}.textarea{resize:vertical}.tag{display:inline-block;padding:2px 8px;border-radius:999px;font-size:12px;font-weight:600}.tag.code{background:#eef2ff;color:var(--primary)}.tag.ok{background:#e8f7ee;color:var(--ok)}.tag.learn{background:#eef2ff;color:var(--primary)}.tag.warn{background:#fdf3e6;color:var(--warn)}.tag.gray{background:#eef0f4;color:var(--muted)}.topbar{height:56px;background:var(--panel);border-bottom:1px solid var(--border);display:flex;align-items:center;padding:0 20px;gap:16px}.topbar .brand{font-weight:700;font-size:16px}.topbar .spacer{flex:1}.topbar .link{color:var(--muted)}.topbar .link:hover{color:var(--primary)}.chat-layout{display:flex;height:100vh;overflow:hidden}.chat-page{flex:1;display:flex;flex-direction:column;height:100vh;min-width:0}.sidebar{width:260px;flex-shrink:0;background:#f7f8fb;border-right:1px solid var(--border);display:flex;flex-direction:column;height:100vh}.sidebar-brand{font-weight:800;font-size:18px;color:var(--primary);padding:18px 18px 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12px}.toolbar .grow{flex-basis:100%}.card{overflow-x:auto}table.grid{min-width:640px}.form-grid{grid-template-columns:1fr}.login-wrap{padding:20px 16px}.login-card{width:100%!important;max-width:420px;padding:24px 20px}.modal{width:100%}.modal-body{padding:16px}}@media (max-width: 420px){.topbar .brand{font-size:14px}.chat-page .topbar>span[style*=muted]{display:none}.tone-tag{padding:4px 11px}}