/* ==========================================
   CSS Custom Properties (Design System)
   ========================================== */
:root {
    /* Colors - Light Mode */
    --primary-color: #2D7A4F;
    --primary-dark: #1e5438;
    --primary-light: #40956b;
    --secondary-color: #FFD700;
    --accent-color: #3498db;
    
    /* Background Colors */
    --bg-body: #f5f7fa;
    --bg-sidebar: #ffffff;
    --bg-card: #ffffff;
    --bg-header: #ffffff;
    
    /* Text Colors */
    --text-primary: #2c3e50;
    --text-secondary: #6c757d;
    --text-muted: #95a5a6;
    
    /* Border & Shadow */
    --border-color: #e1e8ed;
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
    
    /* Status Colors */
    --success: #27ae60;
    --warning: #f39c12;
    --danger: #e74c3c;
    --info: #3498db;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Sidebar Width */
    --sidebar-width: 260px;
}

/* Dark Mode Colors */
[data-theme="dark"] {
    --bg-body: #1a1d23;
    --bg-sidebar: #252932;
    --bg-card: #2d3139;
    --bg-header: #252932;
    
    --text-primary: #e4e6eb;
    --text-secondary: #b0b3b8;
    --text-muted: #8a8d91;
    
    --border-color: #3a3d45;
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.5);
}

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

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

/* ==========================================
   Sidebar Navigation
   ========================================== */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    overflow-y: auto;
    transition: transform var(--transition-normal);
    z-index: 1000;
    box-shadow: var(--shadow-md);
}

.sidebar-header {
    padding: var(--spacing-xl);
    text-align: center;
    border-bottom: 1px solid var(--border-color);
    position: relative;
}

.sidebar-logo {
    width: 60px;
    height: 60px;
    margin-bottom: var(--spacing-sm);
}

.sidebar-header h2 {
    font-size: 1.25rem;
    color: var(--primary-color);
    font-weight: 600;
}

.sidebar-toggle {
    display: none;
    position: absolute;
    right: var(--spacing-md);
    top: var(--spacing-md);
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
}

.sidebar-nav {
    padding: var(--spacing-md);
}

.nav-item {
    display: flex;
    align-items: center;
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-xs);
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    font-weight: 500;
}

.nav-item i {
    width: 24px;
    margin-right: var(--spacing-md);
    font-size: 1.1rem;
}

.nav-item:hover {
    background: rgba(45, 122, 79, 0.1);
    color: var(--primary-color);
    transform: translateX(4px);
}

.nav-item.active {
    background: var(--primary-color);
    color: white;
}

.nav-item.active:hover {
    background: var(--primary-dark);
}

/* ==========================================
   Main Content
   ========================================== */
.main-content {
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: margin-left var(--transition-normal);
}

/* Header */
.header {
    background: var(--bg-header);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-md) var(--spacing-xl);
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.menu-toggle {
    display: none;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
}

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

.header-logo img {
    width: 32px;
    height: 32px;
}

.header-logo span {
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--primary-color);
}

.header-center {
    flex: 1;
    display: flex;
    justify-content: center;
}

.clock {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: rgba(45, 122, 79, 0.1);
    border-radius: var(--radius-lg);
    color: var(--primary-color);
    font-weight: 500;
}

.clock i {
    font-size: 1.1rem;
}

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

.theme-toggle {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.theme-toggle:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: rotate(15deg);
}

/* Content Container */
.content-container {
    flex: 1;
    padding: var(--spacing-xl);
}

/* Page Management */
.page {
    display: none;
    animation: fadeIn var(--transition-normal);
}

.page.active {
    display: block;
}

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

/* Page Header */
.page-header {
    margin-bottom: var(--spacing-xl);
}

.page-header h1 {
    font-size: 2rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.page-header h1 i {
    color: var(--primary-color);
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
}

/* ==========================================
   Cards
   ========================================== */
.card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-xl);
    overflow: hidden;
    transition: all var(--transition-normal);
}

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

.card-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.card-header h3 {
    font-size: 1.25rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.card-header h3 i {
    color: var(--primary-color);
}

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

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.stat-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    border-left: 4px solid var(--primary-color);
}

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

.stat-card.stat-primary {
    border-left-color: var(--primary-color);
}

.stat-card.stat-success {
    border-left-color: var(--success);
}

.stat-card.stat-info {
    border-left-color: var(--info);
}

.stat-card.stat-warning {
    border-left-color: var(--warning);
}

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
}

.stat-primary .stat-icon {
    background: rgba(45, 122, 79, 0.1);
    color: var(--primary-color);
}

.stat-success .stat-icon {
    background: rgba(39, 174, 96, 0.1);
    color: var(--success);
}

.stat-info .stat-icon {
    background: rgba(52, 152, 219, 0.1);
    color: var(--info);
}

.stat-warning .stat-icon {
    background: rgba(243, 156, 18, 0.1);
    color: var(--warning);
}

.stat-content h3 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.stat-content p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Cards Grid */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

/* Jurusan Stats */
.jurusan-stats {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.jurusan-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    background: rgba(45, 122, 79, 0.05);
    border-radius: var(--radius-md);
    border-left: 3px solid var(--primary-color);
}

.jurusan-name {
    font-weight: 500;
    color: var(--text-primary);
}

.jurusan-count {
    font-weight: 700;
    color: var(--primary-color);
    font-size: 1.2rem;
}

/* ==========================================
   Forms
   ========================================== */
.student-form {
    max-width: 800px;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.form-group label i {
    color: var(--primary-color);
}

.required {
    color: var(--danger);
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 1rem;
    color: var(--text-primary);
    background: var(--bg-body);
    transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(45, 122, 79, 0.1);
}

.form-group input[readonly] {
    background: var(--border-color);
    cursor: not-allowed;
}

.form-group textarea {
    resize: vertical;
    min-height: 80px;
}

.form-actions {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
}

/* ==========================================
   Buttons
   ========================================== */
.btn {
    padding: var(--spacing-md) var(--spacing-xl);
    border: none;
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    transition: all var(--transition-fast);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn:active {
    transform: translateY(0);
}

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

.btn-primary:hover {
    background: var(--primary-dark);
}

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

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

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

.btn-danger:hover {
    background: #c0392b;
}

.btn-sm {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.875rem;
}

/* ==========================================
   Tables
   ========================================== */
.table-container {
    overflow-x: auto;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-card);
}

.data-table thead {
    background: var(--primary-color);
    color: white;
}

.data-table th {
    padding: var(--spacing-md);
    text-align: left;
    font-weight: 600;
    white-space: nowrap;
}

.data-table td {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
}

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

.data-table tbody tr:hover {
    background: rgba(45, 122, 79, 0.05);
}

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

.table-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.action-btn {
    padding: var(--spacing-xs) var(--spacing-sm);
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 0.875rem;
}

.action-btn.edit {
    background: var(--info);
    color: white;
}

.action-btn.edit:hover {
    background: #2980b9;
}

.action-btn.delete {
    background: var(--danger);
    color: white;
}

.action-btn.delete:hover {
    background: #c0392b;
}

.action-btn.pdf {
    background: var(--warning);
    color: white;
}

.action-btn.pdf:hover {
    background: #e67e22;
}

.no-data {
    text-align: center;
    color: var(--text-muted);
    padding: var(--spacing-xl);
}

/* ==========================================
   Search
   ========================================== */
.search-form {
    margin-bottom: var(--spacing-xl);
}

.search-input-group {
    position: relative;
    max-width: 600px;
}

.search-input-group i {
    position: absolute;
    left: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
}

.search-input-group input {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-md) var(--spacing-md) 3rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 1rem;
    color: var(--text-primary);
    background: var(--bg-body);
    transition: all var(--transition-fast);
}

.search-input-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(45, 122, 79, 0.1);
}

/* ==========================================
   Settings
   ========================================== */
.setting-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

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

.setting-info h4 {
    font-size: 1.1rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.setting-info p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Toggle Switch */
.switch {
    position: relative;
    display: inline-block;
    width: 60px;
    height: 30px;
}

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

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--text-muted);
    transition: var(--transition-normal);
    border-radius: 30px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 22px;
    width: 22px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: var(--transition-normal);
    border-radius: 50%;
}

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

input:checked + .slider:before {
    transform: translateX(30px);
}

/* ==========================================
   About Page
   ========================================== */
.about-logo {
    width: 120px;
    height: 120px;
}

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

.about-info {
    max-width: 500px;
    margin: 0 auto;
    text-align: left;
}

.info-item {
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    background: rgba(45, 122, 79, 0.05);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.info-item i {
    color: var(--primary-color);
    font-size: 1.2rem;
    width: 24px;
}

/* ==========================================
   Footer
   ========================================== */
.footer {
    background: var(--bg-card);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-lg) var(--spacing-xl);
    margin-top: auto;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.footer-left img {
    width: 24px;
    height: 24px;
}

.footer-left span {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.footer-center {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.footer-center strong {
    color: var(--primary-color);
}

.footer-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.footer-right a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

/* ==========================================
   Toast Notification
   ========================================== */
.toast {
    position: fixed;
    bottom: -100px;
    right: var(--spacing-xl);
    background: var(--primary-color);
    color: white;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    z-index: 9999;
    transition: bottom var(--transition-normal);
    font-weight: 500;
}

.toast.show {
    bottom: var(--spacing-xl);
}

.toast.success {
    background: var(--success);
}

.toast.error {
    background: var(--danger);
}

.toast i {
    font-size: 1.2rem;
}

/* ==========================================
   Utilities
   ========================================== */
.mt-3 {
    margin-top: var(--spacing-lg);
}

.mt-4 {
    margin-top: var(--spacing-xl);
}

/* ==========================================
   Responsive Design
   ========================================== */
@media (max-width: 1024px) {
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.active {
        transform: translateX(0);
    }
    
    .sidebar-toggle {
        display: block;
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .menu-toggle {
        display: block;
    }
    
    .header-logo span {
        display: none;
    }
}

@media (max-width: 768px) {
    :root {
        --sidebar-width: 280px;
    }
    
    .header {
        padding: var(--spacing-md);
    }
    
    .content-container {
        padding: var(--spacing-md);
    }
    
    .page-header h1 {
        font-size: 1.5rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .cards-grid {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .clock {
        font-size: 0.85rem;
        padding: var(--spacing-xs) var(--spacing-md);
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .table-container {
        font-size: 0.875rem;
    }
    
    .data-table th,
    .data-table td {
        padding: var(--spacing-sm);
    }
    
    .toast {
        right: var(--spacing-md);
        left: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    .header-center {
        display: none;
    }
    
    .stat-card {
        flex-direction: column;
        text-align: center;
    }
    
    .form-actions {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
}