/* ==========================================================================
   Website Uptime Monitoring System - Modern Light Theme Architecture
   ========================================================================== */

:root {
    --bg-primary: #f8fafc;
    --bg-surface: #ffffff;
    --bg-surface-hover: #f1f5f9;
    --border-color: #e2e8f0;
    --border-hover: #cbd5e1;
    
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;
    
    --accent-blue: #2563eb;
    --accent-blue-light: #eff6ff;
    --accent-blue-border: #bfdbfe;
    
    --color-working: #16a34a;
    --color-working-bg: #f0fdf4;
    --color-working-border: #bbf7d0;
    
    --color-down: #dc2626;
    --color-down-bg: #fef2f2;
    --color-down-border: #fecaca;
    
    --color-unknown: #64748b;
    --color-unknown-bg: #f8fafc;
    --color-unknown-border: #e2e8f0;

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-card: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.04);
    --transition-fast: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
    padding: 2rem 1.5rem;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
}

/* App Header */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding: 1.5rem;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    flex-wrap: wrap;
    gap: 1.25rem;
}

.brand-title {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.brand-icon {
    width: 44px;
    height: 44px;
    background: linear-gradient(135deg, #2563eb, #3b82f6);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    color: #ffffff;
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
}

.brand-title h1 {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

.brand-subtitle {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

/* Auto-Check Switch */
.auto-check-wrapper {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background-color: var(--bg-primary);
    padding: 0.4rem 0.8rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    font-size: 0.825rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.switch {
    position: relative;
    display: inline-block;
    width: 38px;
    height: 22px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: #cbd5e1;
    transition: .3s;
    border-radius: 22px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 16px;
    width: 16px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .3s;
    border-radius: 50%;
    box-shadow: var(--shadow-sm);
}

input:checked + .slider {
    background-color: var(--accent-blue);
}

input:checked + .slider:before {
    transform: translateX(16px);
}

/* Metric Summary Grid */
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.25rem;
    margin-bottom: 2rem;
}

.metric-card {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-card);
    transition: var(--transition-fast);
}

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

.metric-label {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
    margin-bottom: 0.4rem;
}

.metric-value {
    font-size: 2.25rem;
    font-weight: 800;
    color: var(--text-primary);
}

.metric-card.working .metric-value {
    color: var(--color-working);
}

.metric-card.down .metric-value {
    color: var(--color-down);
}

/* Section Controls */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.section-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
}

.progress-bar-container {
    width: 100%;
    height: 6px;
    background-color: var(--border-color);
    border-radius: 9999px;
    margin-bottom: 1rem;
    overflow: hidden;
    display: none;
}

.progress-bar-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, #2563eb, #10b981);
    transition: width 0.3s ease;
}

/* Buttons */
.btn-primary {
    background: linear-gradient(135deg, #2563eb, #1d4ed8);
    color: #ffffff;
    border: none;
    padding: 0.65rem 1.25rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.875rem;
    cursor: pointer;
    transition: var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: 0 2px 4px rgba(37, 99, 235, 0.2);
}

.btn-primary:hover {
    background: linear-gradient(135deg, #1d4ed8, #1e40af);
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(37, 99, 235, 0.3);
}

.btn-secondary {
    background-color: var(--bg-surface);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    padding: 0.65rem 1.25rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.875rem;
    cursor: pointer;
    transition: var(--transition-fast);
}

.btn-secondary:hover {
    background-color: var(--bg-surface-hover);
    color: var(--text-primary);
}

.btn-sm {
    padding: 0.4rem 0.85rem;
    font-size: 0.8rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    background-color: var(--accent-blue-light);
    color: var(--accent-blue);
    border: 1px solid var(--accent-blue-border);
    cursor: pointer;
    transition: var(--transition-fast);
}

.btn-sm:hover {
    background-color: var(--accent-blue);
    color: #ffffff;
}

.btn-sm:disabled, .btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

/* Websites Data Table */
.table-container {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    overflow: hidden;
}

.monitor-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    font-size: 0.875rem;
}

.monitor-table th {
    background-color: #f1f5f9;
    color: var(--text-secondary);
    font-weight: 700;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border-color);
}

.monitor-table td {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
    vertical-align: middle;
}

.monitor-table tr:last-child td {
    border-bottom: none;
}

.monitor-table tr:hover td {
    background-color: #f8fafc;
}

/* Status Badges */
.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.3rem 0.75rem;
    border-radius: 9999px;
    font-weight: 700;
    font-size: 0.75rem;
    letter-spacing: 0.03em;
    text-transform: uppercase;
}

.status-badge.working {
    background-color: var(--color-working-bg);
    color: var(--color-working);
    border: 1px solid var(--color-working-border);
}

.status-badge.down {
    background-color: var(--color-down-bg);
    color: var(--color-down);
    border: 1px solid var(--color-down-border);
}

.status-badge.unknown {
    background-color: var(--color-unknown-bg);
    color: var(--color-unknown);
    border: 1px solid var(--color-unknown-border);
}

.site-name {
    font-weight: 700;
    color: var(--text-primary);
    font-size: 0.925rem;
}

.site-url {
    color: var(--accent-blue);
    text-decoration: none;
    font-size: 0.8rem;
    display: inline-block;
    max-width: 280px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.site-url:hover {
    text-decoration: underline;
}

.error-text {
    color: var(--color-down);
    font-size: 0.8rem;
    font-weight: 500;
    display: block;
}

.admin-email-tag {
    display: inline-block;
    font-size: 0.75rem;
    color: var(--text-muted);
    background-color: #f1f5f9;
    padding: 0.15rem 0.5rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
}

/* Footer */
.app-footer {
    margin-top: 3rem;
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-muted);
    border-top: 1px solid var(--border-color);
    padding-top: 1.5rem;
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.toast {
    background-color: var(--text-primary);
    color: #ffffff;
    padding: 0.85rem 1.25rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    font-size: 0.875rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    animation: toastIn 0.3s ease forwards;
}

.toast-success {
    border-left: 4px solid var(--color-working);
}

.toast-error {
    border-left: 4px solid var(--color-down);
}

@keyframes toastIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 768px) {
    body { padding: 1rem 0.5rem; }
    .monitor-table th:nth-child(4),
    .monitor-table td:nth-child(4),
    .monitor-table th:nth-child(5),
    .monitor-table td:nth-child(5) {
        display: none;
    }
}