/* ================================
   Design tokens
   ================================ */
:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --info-color: #3b82f6;
    --light-bg: #f8fafc;
    --dark-bg: #1e293b;

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 15px;
    --radius-xl: 20px;

    --shadow-sm: 0 2px 10px rgba(0,0,0,0.05);
    --shadow-md: 0 10px 30px rgba(0,0,0,0.1);
    --shadow-lg: 0 20px 60px rgba(0,0,0,0.2);

    --space-1: 4px;
    --space-2: 8px;
    --space-3: 16px;
    --space-4: 24px;
    --space-5: 32px;

    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
}

* {
    font-family: 'Cairo', sans-serif;
}

body {
    background-color: var(--light-bg);
    min-height: 100vh;
}

/* ================================
   Sidebar
   ================================ */
.sidebar {
    position: fixed;
    top: 0;
    right: 0;
    width: 280px;
    height: 100vh;
    background: linear-gradient(180deg, var(--dark-bg) 0%, #0f172a 100%);
    z-index: 1000;
    transition: all var(--transition-base);
    overflow-y: auto;
}

.sidebar.collapsed {
    width: 80px;
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.sidebar-brand {
    color: white;
    font-size: 1.3rem;
    font-weight: 700;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 10px;
}

.sidebar-brand i {
    font-size: 1.5rem;
    color: var(--primary-color);
}

.sidebar-menu {
    padding: 15px 0;
}

.sidebar-item {
    margin: 5px 10px;
}

.sidebar-link {
    display: flex;
    align-items: center;
    padding: 12px 15px;
    color: rgba(255,255,255,0.75);
    text-decoration: none;
    transition: all var(--transition-fast);
    border-radius: var(--radius-sm);
    position: relative;
}

.sidebar-link:hover {
    background: rgba(255,255,255,0.08);
    color: white;
}

.sidebar-link.active {
    background: rgba(37, 99, 235, 0.18);
    color: white;
    font-weight: 600;
}

.sidebar-link.active::before {
    content: '';
    position: absolute;
    right: -10px;
    top: 8px;
    bottom: 8px;
    width: 3px;
    border-radius: 3px;
    background: var(--primary-color);
}

.sidebar-link i {
    width: 25px;
    margin-left: 10px;
    font-size: 1.1rem;
}

.sidebar-submenu {
    background: rgba(0,0,0,0.2);
    padding-right: 20px;
    border-radius: var(--radius-sm);
    margin-top: 4px;
}

.sidebar-submenu .sidebar-link {
    padding: 8px 15px;
    font-size: 0.9rem;
}

/* ================================
   Main Content
   ================================ */
.main-content {
    margin-right: 280px;
    padding: 20px;
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.sidebar.collapsed + .main-content {
    margin-right: 80px;
}

.page-body {
    flex: 1;
}

/* ================================
   Top Navbar
   ================================ */
.top-navbar {
    background: white;
    border-radius: var(--radius-lg);
    padding: 15px 25px;
    margin-bottom: 20px;
    box-shadow: var(--shadow-sm);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.toggle-sidebar {
    background: none;
    border: none;
    font-size: 1.3rem;
    color: var(--dark-bg);
    cursor: pointer;
    transition: color var(--transition-fast);
}

.toggle-sidebar:hover {
    color: var(--primary-color);
}

.user-dropdown {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
}

/* ================================
   Breadcrumb
   ================================ */
.app-breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    color: #64748b;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.app-breadcrumb a {
    color: #64748b;
    text-decoration: none;
    transition: color var(--transition-fast);
}

.app-breadcrumb a:hover {
    color: var(--primary-color);
}

.app-breadcrumb .current {
    color: var(--dark-bg);
    font-weight: 600;
}

.app-breadcrumb i.sep {
    font-size: 0.7rem;
    color: #cbd5e1;
}

/* ================================
   Cards
   ================================ */
.stat-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: 25px;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    border: none;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 15px;
}

.stat-icon.primary { background: rgba(37, 99, 235, 0.1); color: var(--primary-color); }
.stat-icon.success { background: rgba(16, 185, 129, 0.1); color: var(--success-color); }
.stat-icon.warning { background: rgba(245, 158, 11, 0.1); color: var(--warning-color); }
.stat-icon.info { background: rgba(59, 130, 246, 0.1); color: var(--info-color); }
.stat-icon.danger { background: rgba(239, 68, 68, 0.1); color: var(--danger-color); }

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--dark-bg);
    margin-bottom: 5px;
}

.stat-label {
    color: #64748b;
    font-size: 0.95rem;
}

/* Content Card */
.content-card {
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.content-card-header {
    padding: 20px 25px;
    border-bottom: 1px solid #e2e8f0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
}

.content-card-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--dark-bg);
    margin: 0;
}

.content-card-body {
    padding: 25px;
}

.mini-card {
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: none;
    transition: all var(--transition-base);
}

/* Filter bar */
.filter-bar {
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    padding: 18px 20px;
    margin-bottom: 20px;
}

/* ================================
   Buttons
   ================================ */
.btn {
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

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

.btn-primary:hover {
    background: var(--secondary-color);
    border-color: var(--secondary-color);
    transform: translateY(-1px);
}

/* ================================
   Tables
   ================================ */
.table-container {
    overflow-x: auto;
}

.custom-table {
    width: 100%;
    margin-bottom: 0;
}

.custom-table th {
    background: var(--light-bg);
    color: var(--dark-bg);
    font-weight: 600;
    padding: 15px;
    border-bottom: 2px solid #e2e8f0;
    position: sticky;
    top: 0;
    z-index: 1;
    white-space: nowrap;
}

.custom-table td {
    padding: 15px;
    vertical-align: middle;
    border-bottom: 1px solid #e2e8f0;
}

.custom-table tbody tr {
    transition: background var(--transition-fast);
}

.custom-table tr:hover td {
    background: rgba(37, 99, 235, 0.04);
}

.table-container {
    max-height: 70vh;
}

/* ================================
   Status Badges
   ================================ */
.status-badge {
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 5px;
}

.status-badge::before {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: currentColor;
}

.status-badge.active { background: rgba(16, 185, 129, 0.1); color: var(--success-color); }
.status-badge.inactive { background: rgba(100, 116, 139, 0.1); color: #64748b; }
.status-badge.pending { background: rgba(245, 158, 11, 0.1); color: var(--warning-color); }
.status-badge.cancelled { background: rgba(239, 68, 68, 0.1); color: var(--danger-color); }
.status-badge.expired { background: rgba(239, 68, 68, 0.1); color: var(--danger-color); }
.status-badge.suspended { background: rgba(245, 158, 11, 0.1); color: var(--warning-color); }
.status-badge.graduated { background: rgba(59, 130, 246, 0.1); color: var(--info-color); }

/* ================================
   Forms
   ================================ */
.form-label {
    font-weight: 500;
    color: var(--dark-bg);
    margin-bottom: 8px;
}

.form-control, .form-select {
    border-radius: 10px;
    border: 1px solid #e2e8f0;
    padding: 12px 15px;
    transition: all var(--transition-fast);
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-control.is-invalid, .form-select.is-invalid {
    border-color: var(--danger-color);
}

.field-icon-group {
    position: relative;
}

.field-icon-group i.field-icon {
    position: absolute;
    top: 50%;
    right: 15px;
    transform: translateY(-50%);
    color: #94a3b8;
    pointer-events: none;
}

.field-icon-group .form-control,
.field-icon-group .form-select {
    padding-right: 42px;
}

.required-mark {
    color: var(--danger-color);
    margin-right: 3px;
}

/* Alerts */
.alert {
    border-radius: 10px;
    border: none;
}

/* ================================
   Empty state
   ================================ */
.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: #94a3b8;
}

.empty-state svg {
    width: 120px;
    height: 120px;
    margin-bottom: 12px;
    opacity: 0.85;
}

.empty-state .empty-title {
    color: #64748b;
    font-weight: 500;
    margin: 0;
}

/* ================================
   Footer
   ================================ */
.app-footer {
    text-align: center;
    color: #94a3b8;
    font-size: 0.85rem;
    padding: 20px 0 5px;
}

/* ================================
   Login Page
   ================================ */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    padding: 20px;
}

.login-card {
    background: white;
    border-radius: var(--radius-xl);
    padding: 40px;
    width: 100%;
    max-width: 450px;
    box-shadow: var(--shadow-lg);
}

.login-logo {
    text-align: center;
    margin-bottom: 30px;
}

.login-logo i {
    font-size: 4rem;
    color: var(--primary-color);
}

.login-title {
    text-align: center;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--dark-bg);
    margin-bottom: 30px;
}

/* ================================
   Animation utilities
   ================================ */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(14px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in-up {
    animation: fadeInUp 0.45s ease both;
}

.fade-in-up-1 { animation-delay: 0.05s; }
.fade-in-up-2 { animation-delay: 0.1s; }
.fade-in-up-3 { animation-delay: 0.15s; }
.fade-in-up-4 { animation-delay: 0.2s; }

.hover-lift {
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.hover-lift:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

@keyframes shimmer {
    0% { background-position: -400px 0; }
    100% { background-position: 400px 0; }
}

.skeleton {
    background: linear-gradient(90deg, #e2e8f0 25%, #f1f5f9 37%, #e2e8f0 63%);
    background-size: 800px 100%;
    animation: shimmer 1.4s linear infinite;
    border-radius: var(--radius-sm);
}

@media (prefers-reduced-motion: reduce) {
    .fade-in-up, .hover-lift, .skeleton {
        animation: none !important;
        transition: none !important;
    }
}

/* ================================
   Responsive
   ================================ */
@media (max-width: 992px) {
    .sidebar {
        width: 80px;
    }
    .sidebar .sidebar-brand span,
    .sidebar .sidebar-link span {
        display: none;
    }
    .main-content {
        margin-right: 80px;
    }
}

@media (max-width: 768px) {
    .sidebar {
        right: 0;
        width: 280px;
        transform: translateX(100%);
    }
    .sidebar.show {
        transform: translateX(0);
    }
    .sidebar .sidebar-brand span,
    .sidebar .sidebar-link span {
        display: inline;
    }
    .main-content {
        margin-right: 0;
        padding: 12px;
    }
    .top-navbar {
        padding: 12px 16px;
    }
}