*{box-sizing:border-box;margin:0;padding:0}:root{--primary:#25d366;--primary-dark:#128c7e;--bg:#f0f2f5;--sidebar:#111b21;--card:#fff;--text:#111b21;--text-light:#667781;--border:#e9edef;--danger:#ef5350;--success:#25d366}body{background:var(--bg);color:var(--text);min-height:100vh;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}a{color:inherit;text-decoration:none}.login-page{background:linear-gradient(135deg, var(--primary-dark), var(--primary));justify-content:center;align-items:center;min-height:100vh;display:flex}.login-card{background:#fff;border-radius:16px;width:400px;max-width:90vw;padding:40px;box-shadow:0 20px 60px #00000026}.login-card h1{text-align:center;margin-bottom:8px;font-size:24px}.login-card .subtitle{text-align:center;color:var(--text-light);margin-bottom:32px;font-size:14px}.form-group{margin-bottom:20px}.form-group label{color:var(--text);margin-bottom:6px;font-size:14px;font-weight:500;display:block}.form-group input,.form-group select{border:2px solid var(--border);border-radius:8px;outline:none;width:100%;padding:12px 14px;font-size:15px;transition:border-color .2s}.form-group input:focus{border-color:var(--primary)}.btn{cursor:pointer;border:none;border-radius:8px;width:100%;padding:13px;font-size:16px;font-weight:600;transition:all .2s}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-dark);transform:translateY(-1px)}.btn-danger{background:var(--danger);color:#fff}.btn-sm{width:auto;padding:8px 16px;font-size:14px}.error-msg{color:var(--danger);text-align:center;background:#ffebee;border-radius:8px;margin-bottom:16px;padding:10px;font-size:14px}.switch-link{text-align:center;color:var(--text-light);margin-top:20px;font-size:14px}.switch-link span{color:var(--primary-dark);cursor:pointer;font-weight:500}.app-layout{height:100vh;display:flex;overflow:hidden}.sidebar{background:var(--sidebar);color:#fff;flex-direction:column;flex-shrink:0;width:280px;display:flex}.sidebar-header{border-bottom:1px solid #ffffff1a;padding:20px}.sidebar-header h2{margin-bottom:4px;font-size:18px}.sidebar-header .company{color:#fff9;font-size:12px}.sidebar-nav{flex:1;padding:12px 0;overflow-y:auto}.nav-item{cursor:pointer;color:#fffc;align-items:center;gap:12px;padding:12px 20px;font-size:15px;transition:background .2s;display:flex}.nav-item:hover{background:#ffffff14}.nav-item.active{color:#fff;border-left:3px solid var(--primary);background:#ffffff1f}.nav-item .icon{text-align:center;width:24px;font-size:20px}.sidebar-footer{color:#ffffff80;border-top:1px solid #ffffff1a;padding:16px 20px;font-size:13px}.main-content{flex-direction:column;flex:1;display:flex;overflow:hidden}.page-header{border-bottom:1px solid var(--border);background:#fff;justify-content:space-between;align-items:center;padding:20px 30px;display:flex}.page-header h1{font-size:22px}.page-body{flex:1;padding:24px 30px;overflow-y:auto}.stats-grid{grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:20px;margin-bottom:30px;display:grid}.stat-card{background:#fff;border-radius:12px;padding:24px;box-shadow:0 2px 8px #0000000f}.stat-card .stat-value{color:var(--primary-dark);font-size:32px;font-weight:700}.stat-card .stat-label{color:var(--text-light);margin-top:4px;font-size:14px}.data-table{background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 2px 8px #0000000f}.data-table table{border-collapse:collapse;width:100%}.data-table th{text-align:left;color:var(--text-light);text-transform:uppercase;letter-spacing:.5px;background:#f8f9fa;padding:14px 16px;font-size:13px;font-weight:600}.data-table td{border-top:1px solid var(--border);padding:14px 16px;font-size:14px}.data-table tr:hover td{background:#f8f9fa}.tag{color:#2e7d32;background:#e8f5e9;border-radius:12px;margin-right:4px;padding:2px 8px;font-size:12px;font-weight:500;display:inline-block}.chat-layout{flex:1;display:flex;overflow:hidden}.chat-list{border-right:1px solid var(--border);background:#fff;flex-shrink:0;width:380px;overflow-y:auto}.chat-list-item{border-bottom:1px solid var(--border);cursor:pointer;padding:16px 20px;transition:background .15s}.chat-list-item:hover{background:#f5f6f8}.chat-list-item.active{background:#e8f5e9}.chat-list-item .chat-name{margin-bottom:4px;font-size:15px;font-weight:600}.chat-list-item .chat-preview{color:var(--text-light);white-space:nowrap;text-overflow:ellipsis;font-size:13px;overflow:hidden}.chat-list-item .chat-time{color:var(--text-light);float:right;font-size:11px}.chat-area{background:#efeae2;flex-direction:column;flex:1;display:flex}.chat-header{border-bottom:1px solid var(--border);background:#f0f2f5;align-items:center;gap:12px;padding:14px 24px;display:flex}.chat-header .customer-name{font-weight:600}.chat-header .customer-phone{color:var(--text-light);font-size:13px}.chat-messages{flex-direction:column;flex:1;gap:8px;padding:24px;display:flex;overflow-y:auto}.message-bubble{word-wrap:break-word;border-radius:8px;max-width:65%;padding:8px 14px;font-size:14px;line-height:1.5}.message-bubble.customer{background:#fff;border-top-left-radius:0;align-self:flex-start}.message-bubble.staff{background:#dcf8c6;border-top-right-radius:0;align-self:flex-end}.message-bubble .msg-meta{color:var(--text-light);text-align:right;margin-top:4px;font-size:11px}.chat-input-area{background:var(--bg);align-items:center;gap:12px;padding:12px 24px;display:flex}.chat-input-area input{background:#fff;border:none;border-radius:8px;outline:none;flex:1;padding:12px 16px;font-size:15px}.chat-input-area button{background:var(--primary);color:#fff;cursor:pointer;border:none;border-radius:8px;padding:10px 24px;font-weight:600}.chat-input-area button:hover{background:var(--primary-dark)}.modal-overlay{z-index:1000;background:#00000080;justify-content:center;align-items:center;display:flex;position:fixed;inset:0}.modal{background:#fff;border-radius:16px;width:480px;max-width:90vw;max-height:80vh;padding:32px;overflow-y:auto}.modal h2{margin-bottom:24px}.empty-state{text-align:center;color:var(--text-light);padding:60px 20px}.empty-state .icon{margin-bottom:16px;font-size:48px}.empty-state p{font-size:15px}@media (width<=768px){.sidebar{width:64px}.sidebar .nav-item span:not(.icon){display:none}.chat-list{width:100%}.chat-layout{flex-direction:column}}