:root {
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --secondary-color: #1e293b;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-color: #f8fafc;
    --text-muted: #94a3b8;
    --border-color: #334155;
    --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

#app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.header {
    background: var(--secondary-color);
    border-bottom: 1px solid var(--border-color);
    padding: 1.5rem 2rem;
    text-align: center;
    position: relative;
    z-index: 10;
}

.header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(to right, #3b82f6, #8b5cf6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.25rem;
}

.subtitle {
    color: var(--text-muted);
    font-size: 0.875rem;
    font-weight: 500;
}

/* Navigation */
.nav {
    background: rgba(30, 41, 59, 0.8);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border-color);
    padding: 0 1rem;
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-btn {
    background: none;
    border: none;
    padding: 1rem 1.25rem;
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--text-muted);
    border-bottom: 2px solid transparent;
    transition: var(--transition);
    font-weight: 500;
}

.nav-btn:hover {
    color: var(--text-color);
    background: rgba(255, 255, 255, 0.05);
}

.nav-btn.active {
    border-bottom-color: var(--primary-color);
    color: var(--primary-color);
}

/* Main Content */
.main {
    flex: 1;
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
    padding: 2rem;
}

.view {
    display: none;
    animation: fadeIn 0.4s ease;
}

.view.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2.5rem;
}

.stat-card {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    box-shadow: var(--card-shadow);
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-2px);
    border-color: var(--primary-color);
}

.stat-card h3 {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

.stat-value {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--text-color);
    margin: 0.5rem 0;
    line-height: 1.2;
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Sections */
.section {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 12px;
    margin-bottom: 1.5rem;
    border: 1px solid var(--border-color);
}

.section h2 {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    color: var(--text-color);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

/* Sites Grid */
.sites-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
}

.site-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.site-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--primary-color);
    opacity: 0;
    transition: var(--transition);
}

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

.site-card:hover::before {
    opacity: 1;
}

.site-card h3 {
    margin-bottom: 1rem;
    color: var(--text-color);
    font-size: 1.1rem;
}

.site-meta {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    font-size: 0.9rem;
}

.site-meta span {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-muted);
}

.status-badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.6rem;
    border-radius: 9999px;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.status-badge.active {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.status-badge.inactive {
    background: rgba(245, 158, 11, 0.1);
    color: var(--warning-color);
    border: 1px solid rgba(245, 158, 11, 0.2);
}

/* Common UI Elements */
.btn {
    padding: 0.6rem 1.2rem;
    border: 1px solid transparent;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-hover);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.btn-secondary {
    background: transparent;
    border-color: var(--border-color);
    color: var(--text-muted);
}

.btn-secondary:hover {
    border-color: var(--text-muted);
    color: var(--text-color);
    background: rgba(255, 255, 255, 0.05);
}

.btn-danger {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger-color);
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.btn-danger:hover {
    background: rgba(239, 68, 68, 0.2);
}

/* Forms */
.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.form-control {
    width: 100%;
    padding: 0.75rem;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-color);
    font-size: 0.95rem;
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
}

/* Activity List */
.activity-list {
    max-height: 400px;
    overflow-y: auto;
    padding-right: 0.5rem;
}

.activity-list::-webkit-scrollbar {
    width: 6px;
}

.activity-list::-webkit-scrollbar-track {
    background: transparent;
}

.activity-list::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

.activity-item {
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.activity-item:last-child {
    border-bottom: none;
}

.activity-time {
    font-size: 0.8rem;
    color: var(--text-muted);
    background: rgba(255, 255, 255, 0.05);
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
}

/* Responsive */
@media (max-width: 768px) {
    .nav {
        overflow-x: auto;
        justify-content: flex-start;
        padding-bottom: 0;
    }

    .nav-btn {
        padding: 1rem;
        flex-shrink: 0;
    }

    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
}