:root {
    /* Light Blue Theme Colors */
    --primary-color: #4A90E2;
    --primary-light: #5BA3F5;
    --primary-dark: #357ABD;
    --secondary-color: #87CEEB;
    --accent-color: #6BB6FF;
    
    /* Light Mode Colors */
    --bg-color: #f5f7fa;
    --card-bg: #ffffff;
    --text-color: #333333;
    --text-muted: #666666;
    --border-color: #e0e0e0;
    --shadow: rgba(0,0,0,0.1);
    --hover-bg: #f0f4f8;
    
    /* Dark Mode Colors */
    --dark-bg-color: #1a1d29;
    --dark-card-bg: #252936;
    --dark-text-color: #e4e6eb;
    --dark-text-muted: #b0b3b8;
    --dark-border-color: #3a3f4f;
    --dark-shadow: rgba(0,0,0,0.3);
    --dark-hover-bg: #2d3142;
}

/* Dark Mode */
body.dark-mode {
    --bg-color: var(--dark-bg-color);
    --card-bg: var(--dark-card-bg);
    --text-color: var(--dark-text-color);
    --text-muted: var(--dark-text-muted);
    --border-color: var(--dark-border-color);
    --shadow: var(--dark-shadow);
    --hover-bg: var(--dark-hover-bg);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary-color) 100%);
    min-height: 100vh;
    padding: 20px;
    color: var(--text-color);
    transition: background 0.3s ease, color 0.3s ease;
}

body.dark-mode {
    background: linear-gradient(135deg, #2d3142 0%, #1a1d29 100%);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: var(--card-bg);
    border-radius: 10px;
    box-shadow: 0 10px 40px var(--shadow);
    padding: 30px;
    transition: background 0.3s ease, box-shadow 0.3s ease;
}

.header {
    text-align: center;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 2px solid var(--primary-color);
}

.header h1 {
    color: var(--primary-color);
    font-size: 2.5em;
    margin-bottom: 10px;
}

.login-container {
    max-width: 400px;
    margin: 100px auto;
}

.login-form, .form-container {
    background: var(--card-bg);
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 5px 20px var(--shadow);
    transition: background 0.3s ease, box-shadow 0.3s ease;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-color);
    font-weight: 600;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 2px solid var(--border-color);
    border-radius: 5px;
    font-size: 16px;
    transition: border-color 0.3s;
    background: var(--card-bg);
    color: var(--text-color);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-group input:disabled,
.form-group select:disabled,
.form-group textarea:disabled {
    background-color: var(--hover-bg);
    color: var(--text-muted);
    cursor: not-allowed;
    opacity: 0.7;
}

.btn {
    padding: 12px 30px;
    border: none;
    border-radius: 5px;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    display: inline-block;
    text-align: center;
    margin: 5px 0px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary-color) 100%);
    color: white;
    width: 100%;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(74, 144, 226, 0.4);
}

.btn-secondary {
    background: #6c757d;
    color: white;
}

.btn-secondary:hover {
    background: #5a6268;
}

.btn-success {
    background: #28a745;
    color: white;
}

.btn-success:hover {
    background: #218838;
}

.btn-danger {
    background: #dc3545;
    color: white;
}

.btn-danger:hover {
    background: #c82333;
}

.btn-info {
    background: #17a2b8;
    color: white;
}

.btn-info:hover {
    background: #138496;
}

.navbar {
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary-color) 100%);
    padding: 15px 0;
    margin-bottom: 30px;
    border-radius: 5px;
}

.navbar ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
}

.navbar li a {
    color: white;
    text-decoration: none;
    padding: 10px 20px;
    border-radius: 5px;
    transition: background 0.3s;
}

.navbar li a:hover {
    background: rgba(255,255,255,0.2);
}

.table-container {
    overflow-x: auto;
    margin-top: 20px;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

table th,
table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-color);
}

table th {
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary-color) 100%);
    color: white;
    font-weight: 600;
}

table tr:hover {
    background-color: var(--hover-bg);
    transition: background 0.2s ease;
}

.alert {
    padding: 15px;
    margin-bottom: 20px;
    border-radius: 5px;
}

.alert-success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

body.dark-mode .alert-success {
    background-color: #1e4620;
    color: #d4edda;
    border: 1px solid #2d5a31;
}

.alert-error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

body.dark-mode .alert-error {
    background-color: #4a1e24;
    color: #f8d7da;
    border: 1px solid #5a252d;
}

.alert-info {
    background-color: #d1ecf1;
    color: #0c5460;
    border: 1px solid #bee5eb;
}

body.dark-mode .alert-info {
    background-color: #1a3a42;
    color: #d1ecf1;
    border: 1px solid #2a4a52;
}

.action-buttons {
    display: flex;
    gap: 10px;
}

.action-buttons .btn {
    padding: 6px 12px;
    font-size: 14px;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.card {
    background: var(--card-bg);
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 2px 10px var(--shadow);
    transition: background 0.3s ease, box-shadow 0.3s ease;
}

.card h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--primary-color);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary-color) 100%);
    color: white;
    padding: 20px;
    border-radius: 8px;
    text-align: center;
}

.stat-card h3 {
    font-size: 2.5em;
    margin-bottom: 10px;
}

.stat-card p {
    font-size: 1.1em;
    opacity: 0.9;
}

/* Side Menu Layout Styles */
.admin-wrapper {
    display: flex;
    min-height: 100vh;
    background: var(--bg-color);
    transition: background 0.3s ease;
}

.admin-sidebar {
    width: 260px;
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary-color) 100%);
    min-height: 100vh;
    position: fixed;
    left: 0;
    top: 0;
    box-shadow: 2px 0 10px var(--shadow);
    z-index: 1000;
    overflow-y: auto;
    transition: background 0.3s ease;
}

body.dark-mode .admin-sidebar {
    background: linear-gradient(135deg, #2d3142 0%, #1a1d29 100%);
}

.admin-sidebar .sidebar-header {
    padding: 20px;
    background: rgba(0,0,0,0.2);
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.admin-sidebar .sidebar-header h2 {
    color: white;
    font-size: 1.5em;
    margin: 0;
    text-align: center;
}

.admin-sidebar .sidebar-header p {
    color: rgba(255,255,255,0.8);
    font-size: 0.9em;
    margin: 5px 0 0 0;
    text-align: center;
}

.admin-sidebar .sidebar-menu {
    list-style: none;
    padding: 20px 0;
    margin: 0;
}

.admin-sidebar .sidebar-menu li {
    margin: 0;
}

.admin-sidebar .sidebar-menu li a {
    display: block;
    color: white;
    padding: 15px 20px;
    text-decoration: none;
    transition: all 0.3s;
    border-left: 3px solid transparent;
}

.admin-sidebar .sidebar-menu li a:hover {
    background: rgba(255,255,255,0.1);
    border-left-color: white;
}

.admin-sidebar .sidebar-menu li a.active {
    background: rgba(255,255,255,0.2);
    border-left-color: white;
    font-weight: 600;
}

.admin-sidebar .sidebar-menu li.logout-link {
    margin-top: 20px;
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 20px;
}

/* Dark Mode Toggle */
.theme-toggle {
    margin: 15px 20px;
    padding: 10px 15px;
    background: rgba(255,255,255,0.1);
    border-radius: 5px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    transition: background 0.3s;
}

.theme-toggle:hover {
    background: rgba(255,255,255,0.15);
}

.theme-toggle span {
    color: white;
    font-size: 0.9em;
    margin-right: 10px;
}

.theme-toggle-switch {
    position: relative;
    width: 50px;
    height: 24px;
    background: rgba(255,255,255,0.3);
    border-radius: 12px;
    transition: background 0.3s;
}

.theme-toggle-switch::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    background: white;
    border-radius: 50%;
    top: 2px;
    left: 2px;
    transition: transform 0.3s;
}

body.dark-mode .theme-toggle-switch {
    background: rgba(255,255,255,0.2);
}

body.dark-mode .theme-toggle-switch::after {
    transform: translateX(26px);
}

.admin-main-content {
    flex: 1;
    margin-left: 260px;
    padding: 20px;
}

.admin-main-content .page-header {
    background: var(--card-bg);
    padding: 20px 30px;
    border-radius: 10px;
    box-shadow: 0 2px 10px var(--shadow);
    margin-bottom: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background 0.3s ease, box-shadow 0.3s ease;
}

.admin-main-content .page-header h1 {
    color: var(--primary-color);
    font-size: 2em;
    margin: 0;
}

.admin-main-content .page-header .user-info {
    color: var(--text-muted);
    font-size: 0.9em;
}

.admin-main-content .page-content {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 2px 10px var(--shadow);
    transition: background 0.3s ease, box-shadow 0.3s ease;
}

/* Logo preview */
.logo-preview {
    max-width: 200px;
    max-height: 200px;
    margin: 10px 0;
    border: 2px dashed var(--border-color);
    padding: 10px;
    border-radius: 5px;
    display: block;
}

.logo-preview img {
    max-width: 100%;
    max-height: 180px;
    object-fit: contain;
}

/* Print styles for reports */
@media print {
    .admin-sidebar,
    .btn,
    .no-print,
    .theme-toggle {
        display: none !important;
    }
    
    .admin-main-content {
        margin-left: 0;
        padding: 0;
    }
    
    .page-content {
        box-shadow: none;
        padding: 20px;
    }
    
    .institute-header {
        text-align: center;
        margin-bottom: 20px;
        padding-bottom: 15px;
        border-bottom: 2px solid #333;
    }
    
    .institute-header img {
        max-height: 80px;
        margin-bottom: 10px;
    }
    
    .institute-header h2 {
        margin: 5px 0;
        font-size: 1.5em;
    }
    
    .institute-header p {
        margin: 3px 0;
        font-size: 0.9em;
    }
}

.institute-header {
    text-align: center;
    margin-bottom: 20px;
    padding: 20px;
    background: var(--card-bg);
    border-radius: 8px;
    transition: background 0.3s ease;
}

.institute-header img {
    max-height: 100px;
    margin-bottom: 10px;
}

.institute-header h2 {
    margin: 10px 0 5px 0;
    color: var(--primary-color);
    font-size: 1.8em;
}

.institute-header p {
    margin: 5px 0;
    color: var(--text-muted);
    font-size: 0.95em;
}

/* Search functionality styles */
.search-container {
    margin-bottom: 20px;
    display: flex;
    gap: 10px;
    align-items: center;
    flex-wrap: wrap;
}

.search-container input[type="text"] {
    flex: 1;
    min-width: 250px;
    padding: 10px 15px;
    border: 2px solid var(--border-color);
    border-radius: 5px;
    font-size: 16px;
    transition: border-color 0.3s;
    background: var(--card-bg);
    color: var(--text-color);
}

.search-container input[type="text"]:focus {
    outline: none;
    border-color: var(--primary-color);
}

.search-container .search-icon {
    color: var(--primary-color);
    font-size: 1.2em;
}

.search-container .search-info {
    color: var(--text-muted);
    font-size: 0.9em;
}

.no-results {
    text-align: center;
    padding: 20px;
    color: var(--text-muted);
    font-style: italic;
}

@media (max-width: 768px) {
    .admin-sidebar {
        width: 100%;
        position: relative;
        min-height: auto;
    }
    
    .admin-main-content {
        margin-left: 0;
    }
    
    .container {
        padding: 15px;
    }
    
    .navbar ul {
        flex-direction: column;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .admin-main-content .page-header {
        flex-direction: column;
        align-items: flex-start;
    }
}