/* ============================================
   Variables
   ============================================ */
:root {
    /* Colors */
    --primary: #667eea;
    --secondary: #764ba2;
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --info: #3b82f6;
    
    /* Light theme */
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --text-tertiary: #9ca3af;
    --border: #e5e7eb;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    
    /* Border radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition: all 0.3s ease;
}

body.dark-theme {
    --bg-primary: #1a1a2e;
    --bg-secondary: #16213e;
    --bg-tertiary: #0f1729;
    --text-primary: #f9fafb;
    --text-secondary: #d1d5db;
    --text-tertiary: #9ca3af;
    --border: #374151;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6);
}

/* ============================================
   Reset & Base
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: var(--transition);
    min-height: 100vh;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

a {
    text-decoration: none;
    color: inherit;
}

/* ============================================
   Header
   ============================================ */
.header {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg) 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.logo-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 24px;
}

.logo-text h1 {
    font-size: 24px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-text p {
    font-size: 13px;
    color: var(--text-secondary);
    margin-top: -4px;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.btn-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
}

.btn-icon:hover {
    background: var(--primary);
    color: white;
    transform: translateY(-2px);
}

.btn-icon .badge {
    position: absolute;
    top: -4px;
    right: -4px;
    background: var(--error);
    color: white;
    font-size: 11px;
    font-weight: 600;
    padding: 2px 6px;
    border-radius: var(--radius-full);
}

.user-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
}

.user-menu:hover {
    background: var(--bg-tertiary);
}

.user-menu img {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
}

.user-menu span {
    font-weight: 600;
    font-size: 14px;
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    padding: var(--spacing-2xl) 0;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05), rgba(118, 75, 162, 0.05));
    border-bottom: 1px solid var(--border);
}

.hero-content {
    text-align: center;
}

.hero-title {
    font-size: 48px;
    font-weight: 800;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 20px;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-2xl);
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    max-width: 900px;
    margin: 0 auto;
}

.stat-item {
    background: var(--bg-primary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    box-shadow: var(--shadow-md);
}

.stat-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 22px;
}

.stat-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
}

.stat-label {
    font-size: 13px;
    color: var(--text-secondary);
}

/* ============================================
   Systems Section
   ============================================ */
.systems-section {
    padding: var(--spacing-2xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-header h2 {
    font-size: 36px;
    font-weight: 800;
    margin-bottom: var(--spacing-sm);
}

.section-header p {
    font-size: 18px;
    color: var(--text-secondary);
}

.systems-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(400px, 1fr));
    gap: var(--spacing-xl);
}

.system-card {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
}

.system-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.system-card.coming-soon {
    opacity: 0.6;
    cursor: not-allowed;
}

.system-card-inner {
    padding: var(--spacing-xl);
}

.system-icon {
    width: 70px;
    height: 70px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 32px;
    margin-bottom: var(--spacing-lg);
}

.system-title {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.system-description {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-lg);
}

.system-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border);
}

.status-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 6px 12px;
    border-radius: var(--radius-full);
    font-size: 13px;
    font-weight: 600;
}

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

.status-badge.active i {
    font-size: 8px;
    animation: pulse 2s infinite;
}

.status-badge.coming-soon {
    background: rgba(245, 158, 11, 0.1);
    color: var(--warning);
}

.btn-access {
    padding: 10px 20px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    transition: var(--transition);
}

.btn-access:hover {
    transform: translateX(4px);
}

/* Add System Card */
.add-system {
    border: 2px dashed var(--border);
    background: transparent;
    display: flex;
    align-items: center;
    justify-content: center;
}

.add-system:hover {
    border-color: var(--primary);
    background: rgba(102, 126, 234, 0.05);
}

.add-system-icon {
    width: 80px;
    height: 80px;
    background: var(--bg-secondary);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 36px;
    color: var(--text-tertiary);
    margin-bottom: var(--spacing-md);
}

.add-system h3 {
    font-size: 20px;
    margin-bottom: var(--spacing-sm);
}

.add-system p {
    color: var(--text-secondary);
    font-size: 14px;
}

/* Shine effect */
.shine {
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(
        45deg,
        transparent,
        rgba(255, 255, 255, 0.1),
        transparent
    );
    transform: translateX(-100%);
    transition: transform 0.6s;
}

.system-card:hover .shine {
    transform: translateX(100%);
}

/* ============================================
   Quick Links
   ============================================ */
.quick-links {
    padding: var(--spacing-2xl) 0;
    background: var(--bg-primary);
}

.links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.link-card {
    background: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    transition: var(--transition);
    border: 1px solid var(--border);
}

.link-card:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary);
}

.link-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 22px;
    flex-shrink: 0;
}

.link-content {
    flex: 1;
}

.link-content h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 4px;
}

.link-content p {
    font-size: 13px;
    color: var(--text-secondary);
}

.link-arrow {
    color: var(--text-tertiary);
    transition: var(--transition);
}

.link-card:hover .link-arrow {
    color: var(--primary);
    transform: translateX(4px);
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background: var(--bg-primary);
    border-top: 1px solid var(--border);
    padding: var(--spacing-2xl) 0;
    margin-top: var(--spacing-2xl);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-footer {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 20px;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.logo-footer i {
    color: var(--primary);
}

.footer-left p {
    color: var(--text-secondary);
    font-size: 14px;
}

.footer-right {
    text-align: right;
}

.footer-right p {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: var(--spacing-sm);
}

.footer-links {
    display: flex;
    gap: var(--spacing-lg);
}

.footer-links a {
    color: var(--text-secondary);
    font-size: 14px;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--primary);
}

/* ============================================
   Loading Overlay
   ============================================ */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: none;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    z-index: 9999;
    backdrop-filter: blur(4px);
}

.loading-overlay.active {
    display: flex;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(255, 255, 255, 0.2);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: var(--spacing-md);
}

.loading-overlay p {
    color: white;
    font-size: 16px;
    font-weight: 600;
}

/* ============================================
   Animations
   ============================================ */
@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

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

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .hero-title {
        font-size: 32px;
    }
    
    .hero-subtitle {
        font-size: 16px;
    }
    
    .systems-grid {
        grid-template-columns: 1fr;
    }
    
    .links-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        gap: var(--spacing-lg);
        text-align: center;
    }
    
    .footer-right {
        text-align: center;
    }
}