:root{--primary: #4f46e5;--primary-dark: #4338ca;--primary-light: #eef2ff;--bg: #f5f7fa;--card: #ffffff;--border: #e5e7eb;--text: #1f2937;--text-2: #6b7280;--text-3: #71717a;--ok: #16a34a;--info: #2563eb;--warn: #d97706;--danger: #dc2626;--radius: 8px;--shadow: 0 1px 3px rgba(0, 0, 0, .08);--sidebar-w: 232px}*{box-sizing:border-box}html,body,#root{height:100%;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Microsoft YaHei,PingFang SC,Hiragino Sans GB,Helvetica Neue,Arial,sans-serif;font-size:14px;line-height:1.5;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}button{font-family:inherit}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,[tabindex]:focus-visible{outline:2px solid 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transparent}.nav-item:hover{background:var(--primary-light);color:var(--primary);text-decoration:none}.nav-item.active{background:var(--primary-light);color:var(--primary);font-weight:600;border-left-color:var(--primary)}.sidebar-foot{padding:14px 20px;font-size:12px;color:var(--text-3);border-top:1px solid var(--border)}.main{flex:1;min-width:0;display:flex;flex-direction:column}.topbar{height:60px;background:#fff;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;padding:0 24px;position:sticky;top:0;z-index:20}.topbar-title{font-size:17px;font-weight:600;margin:0}.topbar-user{display:flex;align-items:center;gap:12px}.user-name{color:var(--text-2);max-width:200px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.content{padding:24px;flex:1}.page{max-width:1280px;margin:0 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16px;z-index:100;overflow-y:auto}.modal{background:#fff;border-radius:var(--radius);box-shadow:0 10px 40px #00000026;max-width:100%;animation:modalIn .18s ease}@keyframes modalIn{0%{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:none}}.modal-head{display:flex;align-items:center;justify-content:space-between;padding:14px 18px;border-bottom:1px solid var(--border)}.modal-title{font-size:15px;font-weight:600}.modal-body{padding:18px;max-height:64vh;overflow-y:auto}.modal-foot{display:flex;justify-content:flex-end;gap:8px;padding:12px 18px;border-top:1px solid var(--border)}.confirm-message{margin:0;color:var(--text);line-height:1.6;word-break:break-all}.toast-host{position:fixed;top:20px;left:50%;transform:translate(-50%);display:flex;flex-direction:column;gap:8px;z-index:200;align-items:center;pointer-events:none}.toast{padding:10px 18px;border-radius:8px;color:#fff;font-size:14px;box-shadow:0 4px 16px #00000026;animation:toastIn .2s ease;max-width:80vw}.toast-success{background:var(--ok)}.toast-error{background:var(--danger)}.toast-info{background:#334155}@keyframes toastIn{0%{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:none}}.spinner{width:28px;height:28px;border:3px solid #e0e7ff;border-top-color:var(--primary);border-radius:50%;animation:spin .7s linear infinite;flex-shrink:0}@keyframes spin{to{transform:rotate(360deg)}}.loading{display:flex;align-items:center;justify-content:center;gap:10px;color:var(--text-2);padding:32px 0}.empty{text-align:center;color:var(--text-3);padding:40px 0;font-size:13px}.error-box{background:#fef2f2;border:1px solid #fecaca;color:#b91c1c;padding:10px 14px;border-radius:6px;font-size:13px}.auth-page{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#eef2ff,#f5f7fa,#eef2ff);padding:24px}.auth-card{width:400px;max-width:100%;background:#fff;border-radius:12px;box-shadow:0 8px 40px #4f46e51f;padding:36px 36px 28px}.auth-brand{display:flex;justify-content:center;margin-bottom:16px}.auth-title{margin:0;text-align:center;font-size:22px;font-weight:600}.auth-sub{text-align:center;color:var(--text-2);font-size:13px;margin:8px 0 20px}.auth-form{display:flex;flex-direction:column;gap:4px}.auth-footer{margin-top:16px;text-align:center;font-size:13px;color:var(--text-2)}.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:14px}.stat-card{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);border:1px solid #eef0f4;padding:16px 18px;display:flex;flex-direction:column;gap:6px;position:relative;overflow:hidden}.stat-accent{position:absolute;top:0;left:0;right:0;height:3px}.stat-value{font-size:24px;font-weight:700;line-height:1.2;margin-top:4px;font-variant-numeric:tabular-nums}.stat-label{font-size:13px;color:var(--text-2)}.dash-grid{display:grid;grid-template-columns:1.4fr 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transparent;margin-bottom:-1px}.tab:hover{color:var(--primary)}.tab.active{color:var(--primary);font-weight:600;border-bottom-color:var(--primary)}.im-grid{display:grid;grid-template-columns:300px 1fr;gap:14px;min-height:560px}@media(max-width:900px){.im-grid{grid-template-columns:1fr}}.conv-list{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);border:1px solid #eef0f4;overflow-y:auto;max-height:620px;display:flex;flex-direction:column}.conv-item{display:flex;flex-direction:column;align-items:stretch;gap:4px;padding:12px 16px;border:none;border-bottom:1px solid 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var(--border);font-weight:600;font-size:14px}.msg-flow{flex:1;overflow-y:auto;padding:16px;display:flex;flex-direction:column;gap:10px}.msg{display:flex;flex-direction:column;max-width:72%}.msg.buyer{align-self:flex-start;align-items:flex-start}.msg.seller{align-self:flex-end;align-items:flex-end}.msg-bubble{padding:9px 13px;border-radius:12px;line-height:1.55;font-size:13.5px;word-break:break-word}.msg.buyer .msg-bubble{background:#f3f4f6;color:var(--text);border-bottom-left-radius:3px}.msg.seller .msg-bubble{background:var(--primary);color:#fff;border-bottom-right-radius:3px}.msg-time{font-size:11px;color:var(--text-3);margin-top:4px}.reply-box{display:flex;gap:10px;padding:12px 16px;border-top:1px solid var(--border)}.reply-box .textarea{flex:1}.inv-layout{display:grid;grid-template-columns:300px 1fr;gap:14px}@media(max-width:900px){.inv-layout{grid-template-columns:1fr}}.group-list{list-style:none;margin:0;padding:0}.group-item-wrap{margin:0}.group-item{width:100%;display:flex;align-items:center;justify-content:space-between;padding:11px 14px;border:none;border-bottom:1px solid #f1f3f6;background:transparent;cursor:pointer;font-family:inherit;text-align:left}.group-item:hover{background:#fafbff}.group-item.active{background:var(--primary-light)}.group-name{font-weight:600;font-size:14px}.group-count{font-size:12px;color:var(--text-3)}.filter-bar{display:flex;gap:8px;flex-wrap:wrap}.filter-btn{padding:6px 14px;border:1px solid var(--border);border-radius:16px;background:#fff;color:var(--text-2);font-size:13px;cursor:pointer;transition:all .15s}.filter-btn:hover{border-color:var(--primary);color:var(--primary)}.filter-btn.active{background:var(--primary);border-color:var(--primary);color:#fff}.settings-grid{display:grid;grid-template-columns:1fr 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transparent;border-radius:6px}.nav-item.active{border-bottom-color:var(--primary)}.sidebar-foot{display:none}.topbar{position:static}.content{padding:16px}}.qr-box{display:flex;align-items:center;justify-content:center;min-height:300px;padding:16px;border:1px solid #e5e7eb;border-radius:8px;background:#fff}.qr-box img{max-width:100%;max-height:60vh;width:auto;height:auto;object-fit:contain;border-radius:6px}.qr-empty{color:#b45309;font-size:14px;text-align:center}.qr-hint{margin-top:12px;font-size:13px;color:#6b7280;line-height:1.6}