/* ==================== Reset & Base ==================== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:14px;-webkit-font-smoothing:antialiased}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans SC",sans-serif;color:#2c3e50;background:#f0f2f5;line-height:1.6}
a{color:#4a6cf7;text-decoration:none}a:hover{text-decoration:underline}
code{background:#f4f5f7;padding:2px 6px;border-radius:3px;font-size:13px}
small{color:#909399}
img{max-width:100%}

/* ==================== Auth Page ==================== */
.auth-page{display:flex;align-items:center;justify-content:center;min-height:100vh;background:linear-gradient(135deg,#667eea 0%,#764ba2 100%)}
.auth-container{width:100%;max-width:420px;padding:20px}
.auth-card{background:#fff;border-radius:12px;padding:40px;box-shadow:0 20px 60px rgba(0,0,0,.15)}
.auth-header{text-align:center;margin-bottom:32px}
.auth-icon{width:72px;height:72px;border-radius:50%;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;display:flex;align-items:center;justify-content:center;margin:0 auto 16px}
.auth-header h1{font-size:22px;font-weight:600;color:#1a1a2e;margin-bottom:8px}
.auth-header p{color:#909399;font-size:14px}
.auth-form .form-group{margin-bottom:20px}
.auth-form label{display:flex;align-items:center;gap:8px;font-size:13px;color:#606266;margin-bottom:6px;font-weight:500}
.auth-form input{width:100%;padding:12px 16px;border:1px solid #e0e4ed;border-radius:8px;font-size:14px;transition:border-color .2s,box-shadow .2s;outline:none}
.auth-form input:focus{border-color:#4a6cf7;box-shadow:0 0 0 3px rgba(74,108,247,.1)}

/* ==================== Admin Layout ==================== */
.admin-page{display:flex;min-height:100vh}
.admin-layout{display:flex;width:100%}

/* Sidebar */
.sidebar{width:240px;background:#1a1a2e;color:#ccc;display:flex;flex-direction:column;position:fixed;top:0;left:0;bottom:0;z-index:100;transition:transform .3s}
.sidebar.collapsed{transform:translateX(-240px)}
.sidebar-header{padding:20px;border-bottom:1px solid rgba(255,255,255,.06)}
.logo{display:flex;align-items:center;gap:10px;font-size:16px;font-weight:600;color:#fff}
.logo svg{color:#4a6cf7}
.sidebar-nav{flex:1;overflow-y:auto;padding:12px 0}
.nav-group{margin-bottom:8px}
.nav-group-title{padding:12px 20px 6px;font-size:11px;text-transform:uppercase;color:#666;letter-spacing:1px;font-weight:600}
.nav-item{display:flex;align-items:center;gap:10px;padding:10px 20px;color:#a8b2c1;transition:all .2s;font-size:14px;text-decoration:none;border-left:3px solid transparent}
.nav-item:hover{color:#fff;background:rgba(255,255,255,.04);text-decoration:none}
.nav-item.active{color:#fff;background:rgba(74,108,247,.15);border-left-color:#4a6cf7}
.nav-item svg{flex-shrink:0;width:20px;height:20px}

/* Main Content */
.main-content{flex:1;margin-left:240px;display:flex;flex-direction:column;min-height:100vh;transition:margin-left .3s}
.sidebar.collapsed+.main-content{margin-left:0}

/* Topbar */
.topbar{display:flex;align-items:center;justify-content:space-between;height:56px;background:#fff;padding:0 24px;border-bottom:1px solid #e8eaed;position:sticky;top:0;z-index:50}
.menu-toggle{background:none;border:none;cursor:pointer;color:#606266;padding:6px;border-radius:6px;display:none}
.menu-toggle:hover{background:#f0f2f5}
.topbar-right{display:flex;align-items:center;gap:16px}
.topbar-link{color:#606266;padding:6px;border-radius:6px;display:flex;align-items:center}
.topbar-link:hover{background:#f0f2f5}

.user-dropdown{position:relative}
.user-btn{display:flex;align-items:center;gap:8px;background:none;border:none;cursor:pointer;padding:4px 8px;border-radius:8px;font-size:14px;color:#2c3e50}
.user-btn:hover{background:#f0f2f5}
.avatar{width:32px;height:32px;border-radius:50%;background:linear-gradient(135deg,#4a6cf7,#764ba2);color:#fff;display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:600}
.dropdown-menu{display:none;position:absolute;top:100%;right:0;background:#fff;border-radius:8px;box-shadow:0 4px 20px rgba(0,0,0,.12);min-width:160px;z-index:200;margin-top:8px;padding:4px 0}
.dropdown-menu.show{display:block}
.dropdown-item{display:block;padding:8px 16px;color:#2c3e50;font-size:14px;text-decoration:none}
.dropdown-item:hover{background:#f0f2f5;text-decoration:none}
.dropdown-divider{height:1px;background:#e8eaed;margin:4px 0}

/* Page Content */
.page-content{padding:24px;flex:1}
.page-header{display:flex;align-items:center;flex-wrap:wrap;gap:12px;margin-bottom:24px}
.page-header h2{font-size:20px;font-weight:600;color:#1a1a2e}
.page-breadcrumb{font-size:13px;color:#909399}
.page-actions{margin-left:auto;display:flex;gap:8px}

/* ==================== Cards ==================== */
.card{background:#fff;border-radius:10px;box-shadow:0 1px 3px rgba(0,0,0,.06)}
.card-header{padding:16px 20px;border-bottom:1px solid #f0f2f5}
.card-header h3{font-size:16px;font-weight:600}
.card-body{padding:20px}

/* Stats */
.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px;margin-bottom:24px}
.stat-card{background:#fff;border-radius:10px;padding:20px;display:flex;align-items:center;gap:16px;box-shadow:0 1px 3px rgba(0,0,0,.06)}
.stat-icon{width:48px;height:48px;border-radius:12px;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.stat-value{font-size:24px;font-weight:700;color:#1a1a2e}
.stat-label{font-size:13px;color:#909399;margin-top:2px}

/* ==================== Table ==================== */
.table{width:100%;border-collapse:collapse}
.table th{text-align:left;padding:12px 16px;font-size:13px;font-weight:600;color:#606266;border-bottom:1px solid #f0f2f5;white-space:nowrap}
.table td{padding:12px 16px;font-size:14px;border-bottom:1px solid #f5f6f8}
.table tbody tr:hover{background:#f8f9fb}
.table-actions{display:flex;gap:6px;white-space:nowrap}
.table-toolbar{display:flex;gap:8px;margin-bottom:16px;flex-wrap:wrap}

/* ==================== Forms ==================== */
.form-group{margin-bottom:16px}
.form-group label{display:block;font-size:13px;font-weight:500;color:#606266;margin-bottom:6px}
.form-control{width:100%;padding:10px 14px;border:1px solid #e0e4ed;border-radius:6px;font-size:14px;transition:border-color .2s,box-shadow .2s;outline:none;background:#fff}
.form-control:focus{border-color:#4a6cf7;box-shadow:0 0 0 3px rgba(74,108,247,.1)}
textarea.form-control{resize:vertical;min-height:80px}
select.form-control{cursor:pointer}

/* ==================== Buttons ==================== */
.btn{display:inline-flex;align-items:center;gap:6px;padding:10px 18px;border:1px solid transparent;border-radius:6px;font-size:14px;font-weight:500;cursor:pointer;transition:all .2s;text-decoration:none;line-height:1.4}
.btn-primary{background:#4a6cf7;color:#fff;border-color:#4a6cf7}
.btn-primary:hover{background:#3651d5;border-color:#3651d5}
.btn-outline{background:#fff;color:#606266;border-color:#e0e4ed}
.btn-outline:hover{color:#4a6cf7;border-color:#4a6cf7}
.btn-danger{background:#f56c6c;color:#fff;border-color:#f56c6c}
.btn-danger:hover{background:#e05050}
.btn-warning{background:#e6a23c;color:#fff;border-color:#e6a23c}
.btn-warning:hover{background:#cf9236}
.btn-success{background:#67c23a;color:#fff;border-color:#67c23a}
.btn-success:hover{background:#5daf34}
.btn-block{width:100%;justify-content:center}
.btn-sm{padding:5px 10px;font-size:12px}
.btn:disabled{opacity:.6;cursor:not-allowed}

/* ==================== Badges ==================== */
.badge{display:inline-block;padding:2px 8px;border-radius:4px;font-size:12px;font-weight:500}
.badge-info{background:#e8f4fd;color:#2196f3}
.badge-success{background:#e8f5e9;color:#4caf50}
.badge-warning{background:#fff3e0;color:#ff9800}
.badge-danger{background:#ffebee;color:#f44336}

/* ==================== Modal ==================== */
.modal{display:none;position:fixed;top:0;left:0;right:0;bottom:0;z-index:1000}
.modal.show{display:flex;align-items:center;justify-content:center}
.modal-overlay{position:absolute;top:0;left:0;right:0;bottom:0;background:rgba(0,0,0,.5)}
.modal-content{position:relative;background:#fff;border-radius:12px;width:90%;max-width:520px;max-height:90vh;overflow-y:auto;box-shadow:0 20px 60px rgba(0,0,0,.2)}
.modal-header{display:flex;align-items:center;justify-content:space-between;padding:16px 24px;border-bottom:1px solid #f0f2f5}
.modal-header h3{font-size:18px;font-weight:600}
.modal-close{background:none;border:none;font-size:24px;cursor:pointer;color:#909399;padding:0;line-height:1}
.modal-close:hover{color:#2c3e50}
.modal-body{padding:24px}
.modal-footer{display:flex;justify-content:flex-end;gap:8px;padding:16px 24px;border-top:1px solid #f0f2f5}

/* ==================== Pagination ==================== */
.pagination{display:flex;align-items:center;gap:6px;margin-top:16px;flex-wrap:wrap}
.pagination-info{font-size:13px;color:#909399;margin-right:8px}
.pagination-link{display:inline-flex;align-items:center;justify-content:center;min-width:32px;height:32px;padding:0 8px;border:1px solid #e0e4ed;border-radius:6px;font-size:13px;color:#606266;text-decoration:none}
.pagination-link:hover{border-color:#4a6cf7;color:#4a6cf7;text-decoration:none}
.pagination-link.active{background:#4a6cf7;color:#fff;border-color:#4a6cf7}

/* ==================== Upload ==================== */
.upload-area{border:2px dashed #e0e4ed;border-radius:10px;padding:40px 20px;text-align:center;transition:all .2s;cursor:pointer}
.upload-area:hover,.upload-area.dragover{border-color:#4a6cf7;background:rgba(74,108,247,.02)}
.upload-area p{margin-top:8px;color:#606266;font-size:14px}
.upload-area .text-muted{color:#909399;font-size:12px}

/* ==================== Version Info ==================== */
.version-info{display:flex;align-items:center;gap:16px}
.version-badge{background:linear-gradient(135deg,#4a6cf7,#764ba2);color:#fff;padding:8px 20px;border-radius:20px;font-size:18px;font-weight:700}
.version-status{font-size:14px;color:#4caf50}

/* ==================== Alert ==================== */
.alert{padding:12px 16px;border-radius:8px;margin-bottom:16px;font-size:14px}
.alert-error{background:#ffebee;color:#c62828;border:1px solid #ffcdd2}

/* ==================== Helpers ==================== */
.text-center{text-align:center}
.text-muted{color:#909399}
.text-right{text-align:right}

/* ==================== Responsive ==================== */
@media (max-width:768px){
    .sidebar{transform:translateX(-240px)}
    .sidebar.show{transform:translateX(0)}
    .main-content{margin-left:0}
    .menu-toggle{display:flex}
    .page-header{flex-direction:column;align-items:flex-start}
    .page-actions{margin-left:0}
    .stats-grid{grid-template-columns:repeat(auto-fit,minmax(160px,1fr))}
    .table{display:block;overflow-x:auto}
}