/* ========== CSS Variables ========== */
:root {
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --primary-light: #eef2ff;
    --bg: #f8fafc;
    --sidebar-bg: #1e293b;
    --sidebar-text: #94a3b8;
    --sidebar-active: #4f46e5;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border: #e2e8f0;
    --success: #22c55e;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #3b82f6;
    --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);
    --radius: 12px;
    --radius-sm: 8px;
    --transition: all 0.2s ease;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background: var(--bg);
    color: var(--text-primary);
    line-height: 1.6;
    overflow: hidden;
    height: 100vh;
}

.app-container {
    display: flex;
    height: 100vh;
}

/* ========== Sidebar ========== */
.sidebar {
    width: 240px;
    background: var(--sidebar-bg);
    color: var(--sidebar-text);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    transition: var(--transition);
    z-index: 100;
}

.sidebar .logo {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 20px 24px;
    font-size: 20px;
    font-weight: 700;
    color: #fff;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.sidebar .logo i { color: #818cf8; font-size: 24px; }

.nav-menu {
    flex: 1;
    padding: 12px 0;
    overflow-y: auto;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 24px;
    color: var(--sidebar-text);
    text-decoration: none;
    transition: var(--transition);
    border-left: 3px solid transparent;
    font-size: 14px;
    cursor: pointer;
}

.nav-item:hover {
    background: rgba(255,255,255,0.05);
    color: #e2e8f0;
}

.nav-item.active {
    background: rgba(79, 70, 229, 0.15);
    color: #818cf8;
    border-left-color: var(--sidebar-active);
}

.nav-item i { width: 20px; text-align: center; font-size: 16px; }

.sidebar-footer {
    padding: 16px 24px;
    border-top: 1px solid rgba(255,255,255,0.05);
}

.connection-status {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    color: var(--sidebar-text);
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    display: inline-block;
}

.status-dot.online { background: var(--success); box-shadow: 0 0 6px var(--success); }
.status-dot.offline { background: var(--text-muted); }
.status-dot.warning { background: var(--warning); }

/* ========== Main Content ========== */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.top-bar {
    display: flex;
    align-items: center;
    padding: 12px 24px;
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
    gap: 16px;
    flex-shrink: 0;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 20px;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px;
}

.top-bar h2 { font-size: 18px; font-weight: 600; flex: 1; }

.top-bar-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.search-box {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 6px 12px;
    width: 240px;
}

.search-box i { color: var(--text-muted); font-size: 14px; }
.search-box input { border: none; background: none; outline: none; flex: 1; font-size: 13px; color: var(--text-primary); }
.search-box input::placeholder { color: var(--text-muted); }

.notification-bell {
    position: relative;
    cursor: pointer;
    font-size: 18px;
    color: var(--text-secondary);
}

.notification-bell .badge {
    position: absolute;
    top: -6px;
    right: -6px;
    background: var(--danger);
    color: #fff;
    font-size: 10px;
    border-radius: 50%;
    width: 16px;
    height: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
}

/* ========== Page Content ========== */
.page-content {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
}

.page { display: none; }
.page.active { display: block; }

/* ========== Stats Grid ========== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 16px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.stat-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    flex-shrink: 0;
}

.stat-icon.blue { background: #dbeafe; color: #3b82f6; }
.stat-icon.green { background: #dcfce7; color: #22c55e; }
.stat-icon.orange { background: #fed7aa; color: #f97316; }
.stat-icon.purple { background: #e9d5ff; color: #a855f7; }

.stat-info { display: flex; flex-direction: column; }
.stat-value { font-size: 24px; font-weight: 700; color: var(--text-primary); line-height: 1.2; }
.stat-label { font-size: 13px; color: var(--text-secondary); }

/* ========== Cards ========== */
.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
}

.card h3 {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-primary);
}

/* ========== Chart ========== */
.chart-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 20px;
}

.chart-card canvas { height: 240px !important; }

/* ========== Tables ========== */
.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}

.data-table thead th {
    text-align: left;
    padding: 10px 12px;
    border-bottom: 2px solid var(--border);
    color: var(--text-secondary);
    font-weight: 600;
    white-space: nowrap;
}

.data-table tbody td {
    padding: 10px 12px;
    border-bottom: 1px solid var(--border);
    vertical-align: middle;
}

.data-table tbody tr:hover { background: var(--primary-light); }
.data-table tbody tr:last-child td { border-bottom: none; }

.text-center { text-align: center !important; }

/* ========== Status Badges ========== */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
}

.badge.active { background: #dcfce7; color: #166534; }
.badge.expired { background: #fef3c7; color: #92400e; }
.badge.disabled { background: #fee2e2; color: #991b1b; }
.badge.online { background: #dcfce7; color: #166534; }
.badge.offline { background: #fee2e2; color: #991b1b; }

/* ========== Buttons ========== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); }

.btn-secondary { background: var(--bg); color: var(--text-primary); border: 1px solid var(--border); }
.btn-secondary:hover { background: var(--border); }

.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: #dc2626; }

.btn-sm { padding: 4px 10px; font-size: 12px; }

.btn-icon {
    width: 32px;
    height: 32px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    font-size: 14px;
}

.btn-icon.edit { background: #dbeafe; color: #3b82f6; }
.btn-icon.edit:hover { background: #bfdbfe; }
.btn-icon.delete { background: #fee2e2; color: #ef4444; }
.btn-icon.delete:hover { background: #fecaca; }
.btn-icon.copy { background: #d1fae5; color: #059669; }
.btn-icon.copy:hover { background: #a7f3d0; }

/* ========== Section Toolbar ========== */
.section-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
    flex-wrap: wrap;
    gap: 12px;
}

.filter-group {
    display: flex;
    align-items: center;
    gap: 8px;
}

.filter-group select, .filter-group input {
    padding: 6px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 13px;
    background: var(--card-bg);
    color: var(--text-primary);
    outline: none;
}

.filter-group input { width: 180px; }

/* ========== Settings Form ========== */
.settings-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
    max-width: 400px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.form-group label {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
}

.form-group input, .form-group select, .form-group textarea {
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 13px;
    outline: none;
    transition: var(--transition);
    background: var(--card-bg);
    color: var(--text-primary);
}

.form-group input:focus, .form-group select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

/* ========== Modal ========== */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal-overlay.open { display: flex; }

.modal {
    background: var(--card-bg);
    border-radius: var(--radius);
    width: 90%;
    max-width: 500px;
    max-height: 85vh;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    animation: modalIn 0.2s ease;
}

@keyframes modalIn {
    from { transform: translateY(-20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
}

.modal-header h3 { font-size: 16px; margin: 0; }

.modal-close {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-muted);
    line-height: 1;
}

.modal-body {
    padding: 20px;
    overflow-y: auto;
    max-height: calc(85vh - 60px);
}

.modal-body .form-group { margin-bottom: 14px; }

/* ========== Progress Bar ========== */
.progress-bar {
    width: 100%;
    height: 6px;
    background: var(--bg);
    border-radius: 3px;
    overflow: hidden;
    min-width: 100px;
}

.progress-bar .progress-fill {
    height: 100%;
    border-radius: 3px;
    transition: width 0.3s ease;
}

.progress-fill.low { background: var(--success); }
.progress-fill.medium { background: var(--warning); }
.progress-fill.high { background: var(--danger); }

/* ========== Toast ========== */
.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.toast {
    padding: 12px 20px;
    border-radius: var(--radius-sm);
    color: #fff;
    font-size: 13px;
    box-shadow: var(--shadow-lg);
    animation: toastIn 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
    max-width: 360px;
}

.toast.success { background: var(--success); }
.toast.error { background: var(--danger); }
.toast.warning { background: var(--warning); }
.toast.info { background: var(--info); }

@keyframes toastIn {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

/* ========== Responsive ========== */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: -240px;
        height: 100vh;
        top: 0;
    }
    .sidebar.open { left: 0; }
    .menu-toggle { display: block; }
    .chart-grid { grid-template-columns: 1fr; }
    .stats-grid { grid-template-columns: 1fr 1fr; }
    .search-box { width: 160px; }
    .section-toolbar { flex-direction: column; align-items: stretch; }
    .filter-group { flex-wrap: wrap; }
    .filter-group input { width: 100%; }
}
/* ========== Config Code Block ========== */
.config-block {
    background: #1e293b;
    color: #e2e8f0;
    padding: 12px;
    border-radius: 6px;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 12px;
    overflow-x: auto;
    white-space: pre-wrap;
    word-break: break-all;
    max-height: 300px;
    overflow-y: auto;
}