/* Responsive Design System - Base Styles */
:root {
    --primary: #667eea;
    --primary-dark: #5568d3;
    --secondary: #764ba2;
    --success: #28a745;
    --danger: #dc3545;
    --warning: #ffc107;
    --dark: #343a40;
    --light: #f8f9fa;
    --border: #dee2e6;
    --text: #333;
    --text-muted: #666;
    --shadow: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-lg: 0 4px 12px rgba(0,0,0,0.15);
    --radius: 8px;
    --transition: all 0.3s ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text);
    background: #f5f5f5;
    -webkit-text-size-adjust: 100%;
}

/* Navigation */
.navbar {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    padding: 0 1rem;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-lg);
}

.navbar-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    min-height: 60px;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 700;
    text-decoration: none;
    color: white;
}

.navbar-brand-icon {
    width: 32px;
    height: 32px;
    background: rgba(255,255,255,0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
}

.navbar-menu {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.navbar-menu a {
    color: white;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: var(--transition);
    font-weight: 500;
    font-size: 0.95rem;
}

.navbar-menu a:hover {
    background: rgba(255,255,255,0.15);
}

/* Hamburger Menu */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
    padding: 0.5rem;
    z-index: 1001;
}

.hamburger span {
    width: 24px;
    height: 3px;
    background: white;
    border-radius: 2px;
    transition: var(--transition);
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* Container */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem;
}

/* Cards */
.card {
    background: white;
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    margin-bottom: 1rem;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.stat-card {
    background: white;
    padding: 1.25rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    text-align: center;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 0.25rem;
}

.stat-label {
    color: var(--text-muted);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.feature-card {
    background: white;
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.625rem 1.5rem;
    border: none;
    border-radius: 4px;
    font-weight: 600;
    font-size: 0.95rem;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-success { background: var(--success); color: white; }
.btn-danger { background: var(--danger); color: white; }

/* Tables */
.table-container {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin: 1rem 0;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: white;
}

th, td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

th {
    background: var(--light);
    font-weight: 600;
    color: var(--dark);
}

/* Mobile Table to Cards */
@media (max-width: 768px) {
    table, thead, tbody, th, td, tr {
        display: block;
    }
    
    thead tr {
        position: absolute;
        top: -9999px;
        left: -9999px;
    }
    
    tr {
        border: 1px solid var(--border);
        border-radius: var(--radius);
        margin-bottom: 1rem;
        background: white;
        box-shadow: var(--shadow);
    }
    
    td {
        border: none;
        position: relative;
        padding-left: 50%;
        text-align: left;
    }
    
    td:before {
        position: absolute;
        left: 1rem;
        width: 45%;
        padding-right: 1rem;
        white-space: nowrap;
        font-weight: 600;
        color: var(--dark);
        content: attr(data-label);
    }
}

/* Badges */
.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.85rem;
    font-weight: 600;
}

.badge-success { background: var(--success); color: white; }
.badge-danger { background: var(--danger); color: white; }
.badge-warning { background: var(--warning); color: var(--dark); }

/* Modals */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
}

.modal.show {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: white;
    border-radius: var(--radius);
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
}

.modal-header {
    padding: 1.5rem;
    border-bottom: 2px solid var(--light);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    padding: 1.5rem;
    border-top: 2px solid var(--light);
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }
    
    .navbar-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
        flex-direction: column;
        align-items: stretch;
        padding: 80px 1rem 2rem;
        gap: 0;
        transition: right 0.3s ease;
        overflow-y: auto;
    }
    
    .navbar-menu.active {
        right: 0;
        box-shadow: -4px 0 12px rgba(0,0,0,0.3);
    }
    
    .navbar-menu a {
        padding: 1rem;
        border-bottom: 1px solid rgba(255,255,255,0.1);
        border-radius: 0;
    }
    
    .container {
        padding: 0.75rem;
    }
    
    .card {
        padding: 1rem;
    }
    
    .stats-grid {
        grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
        gap: 0.75rem;
    }
    
    .stat-value {
        font-size: 1.5rem;
    }
    
    .stat-label {
        font-size: 0.8rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .btn {
        width: 100%;
        margin-bottom: 0.5rem;
    }
    
    .modal-content {
        width: 95%;
        margin: 1rem;
    }
    
    .modal-header,
    .modal-body,
    .modal-footer {
        padding: 1rem;
    }
    
    .modal-footer {
        flex-direction: column;
    }
}

/* Utility Classes */
.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }