/* ============================================================================
   School Management System - Main Stylesheet
   ============================================================================ */

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

:root {
    --primary-color: #2563eb;
    --secondary-color: #64748b;
    --success-color: #22c55e;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --info-color: #06b6d4;
    --dark-color: #1e293b;
    --light-color: #f8fafc;
    --border-color: #e2e8f0;
    --sidebar-width: 280px;
    --header-height: 70px;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    font-size: 14px;
    line-height: 1.6;
    color: #334155;
    background: #f1f5f9;
}

/* Login Page Styles */
.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.login-container {
    width: 100%;
    max-width: 450px;
    padding: 20px;
}

.login-box {
    background: white;
    border-radius: 12px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    overflow: hidden;
}

.login-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 40px 30px;
    text-align: center;
}

.login-header h1 {
    font-size: 24px;
    margin-bottom: 5px;
}

.login-header h2 {
    font-size: 18px;
    font-weight: 500;
    margin-bottom: 5px;
}

.login-header p {
    font-size: 13px;
    opacity: 0.9;
}

.login-form {
    padding: 30px;
}

.login-footer {
    padding: 20px 30px;
    background: #f8fafc;
    text-align: center;
    font-size: 12px;
    color: #64748b;
}

/* Main Layout */
.wrapper {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: var(--dark-color);
    color: white;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
    z-index: 1000;
}

.sidebar-header {
    padding: 20px;
    background: #0f172a;
    border-bottom: 1px solid #334155;
}

.sidebar-header h2 {
    font-size: 18px;
    margin-bottom: 5px;
}

.sidebar-header p {
    font-size: 12px;
    color: #94a3b8;
}

.sidebar-menu {
    padding: 20px 0;
}

.sidebar-menu ul {
    list-style: none;
}

.sidebar-menu > ul > li {
    margin-bottom: 5px;
}

.sidebar-menu a {
    display: flex;
    align-items: center;
    padding: 12px 20px;
    color: #cbd5e1;
    text-decoration: none;
    transition: all 0.3s;
}

.sidebar-menu a:hover {
    background: #334155;
    color: white;
}

.sidebar-menu a.active {
    background: var(--primary-color);
    color: white;
}

.sidebar-menu a span {
    margin-right: 10px;
    font-size: 18px;
}

.menu-section {
    margin-top: 10px;
}

.menu-title {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 20px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    color: #94a3b8;
    letter-spacing: 0.5px;
    cursor: pointer !important;
    user-select: none;
    transition: background 0.3s ease, color 0.3s ease;
}

.menu-title:hover {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    cursor: pointer !important;
}

.menu-title.active {
    background: var(--primary-color);
    color: white;
}

.menu-toggle {
    display: inline-block;
    font-size: 10px;
    transition: transform 0.3s ease;
}

.submenu {
    list-style: none;
}

.submenu a {
    padding-left: 50px;
    font-size: 13px;
}

/* Main Content */
.main-content {
    margin-left: var(--sidebar-width);
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Top Bar */
.top-bar {
    background: white;
    height: var(--header-height);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 30px;
    position: sticky;
    top: 0;
    z-index: 100;
}

.page-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--dark-color);
}

.user-menu {
    display: flex;
    align-items: center;
    gap: 15px;
}

.user-name {
    font-weight: 500;
}

.user-role {
    font-size: 12px;
    color: var(--secondary-color);
}

/* Content Wrapper */
.content-wrapper {
    flex: 1;
    padding: 30px;
}

/* Footer */
.footer {
    background: white;
    border-top: 1px solid var(--border-color);
    padding: 20px 30px;
    text-align: center;
    font-size: 13px;
    color: var(--secondary-color);
}

/* Page Header */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.page-header h1 {
    font-size: 28px;
    font-weight: 600;
    color: var(--dark-color);
}

/* Alerts */
.alert {
    padding: 15px 20px;
    border-radius: 8px;
    margin-bottom: 20px;
    border-left: 4px solid;
}

.alert-success {
    background: #dcfce7;
    border-color: var(--success-color);
    color: #166534;
}

.alert-error {
    background: #fee2e2;
    border-color: var(--danger-color);
    color: #991b1b;
}

.alert-info {
    background: #dbeafe;
    border-color: var(--info-color);
    color: #1e40af;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.3s;
    text-align: center;
}

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

.btn-primary:hover {
    background: #1d4ed8;
}

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

.btn-secondary:hover {
    background: #475569;
}

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

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

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

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

.btn-outline {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--dark-color);
}

.btn-logout {
    background: var(--danger-color);
    color: white;
    padding: 8px 16px;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 12px;
}

.btn-block {
    display: block;
    width: 100%;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: white;
    border-radius: 10px;
    padding: 25px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    display: flex;
    align-items: center;
    gap: 20px;
    transition: transform 0.3s, box-shadow 0.3s;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
}

.stat-icon {
    font-size: 40px;
    width: 70px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 12px;
}

.stat-info h3 {
    font-size: 28px;
    font-weight: 700;
    color: var(--dark-color);
    margin-bottom: 5px;
}

.stat-info p {
    font-size: 14px;
    color: var(--secondary-color);
}

/* Dashboard Grid */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 20px;
}

.dashboard-widget {
    background: white;
    border-radius: 10px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    overflow: hidden;
}

.widget-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
}

.widget-header h2 {
    font-size: 18px;
    font-weight: 600;
}

.widget-content {
    padding: 20px;
    max-height: 400px;
    overflow-y: auto;
}

.no-data {
    text-align: center;
    padding: 40px 20px;
    color: var(--secondary-color);
}

/* Activity List */
.activity-list {
    list-style: none;
}

.activity-list li {
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.activity-list li:last-child {
    border-bottom: none;
}

.activity-user {
    font-weight: 500;
    color: var(--dark-color);
}

.activity-action {
    font-size: 13px;
    color: var(--secondary-color);
}

.activity-time {
    font-size: 12px;
    color: var(--secondary-color);
}

/* Notification List */
.notification-list {
    list-style: none;
}

.notification-list li {
    padding: 15px 0;
    border-bottom: 1px solid var(--border-color);
}

.notification-list li:last-child {
    border-bottom: none;
}

.notification-list strong {
    display: block;
    margin-bottom: 5px;
    color: var(--dark-color);
}

.notification-list p {
    font-size: 13px;
    color: var(--secondary-color);
    margin-bottom: 5px;
}

.notification-time {
    font-size: 12px;
    color: var(--secondary-color);
}

/* Filter Section */
.filter-section {
    background: white;
    padding: 20px;
    border-radius: 10px;
    margin-bottom: 20px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.filter-form {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.filter-form input,
.filter-form select {
    padding: 10px 15px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
}

.filter-form input[type="text"],
.filter-form input[type="date"] {
    flex: 1;
    min-width: 200px;
}

.filter-form select {
    min-width: 150px;
}

/* Data Table */
.data-table {
    background: white;
    border-radius: 10px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    overflow: hidden;
}

.data-table table {
    width: 100%;
    border-collapse: collapse;
}

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

.data-table th {
    padding: 15px;
    text-align: left;
    font-weight: 600;
    color: var(--dark-color);
    border-bottom: 2px solid var(--border-color);
}

.data-table td {
    padding: 15px;
    border-bottom: 1px solid var(--border-color);
}

.data-table tbody tr:hover {
    background: var(--light-color);
}

/* Badges */
.badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
}

.badge-success {
    background: #dcfce7;
    color: #166534;
}

.badge-danger {
    background: #fee2e2;
    color: #991b1b;
}

.badge-warning {
    background: #fef3c7;
    color: #92400e;
}

.badge-info {
    background: #dbeafe;
    color: #1e40af;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--dark-color);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px 15px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
    font-family: inherit;
}

.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(37, 99, 235, 0.1);
}

.form-group small {
    display: block;
    margin-top: 5px;
    font-size: 12px;
    color: var(--secondary-color);
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.form-group.full-width {
    grid-column: 1 / -1;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    overflow-y: auto;
}

.modal-content {
    background: white;
    margin: 50px auto;
    width: 90%;
    max-width: 600px;
    border-radius: 12px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.modal-large {
    max-width: 900px;
}

.modal-header {
    padding: 20px 30px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    font-size: 20px;
    font-weight: 600;
}

.modal-header .close {
    font-size: 30px;
    font-weight: 300;
    color: var(--secondary-color);
    cursor: pointer;
    line-height: 1;
}

.modal-header .close:hover {
    color: var(--dark-color);
}

.modal-content form {
    padding: 30px;
}

.modal-footer {
    padding: 20px 30px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

/* Search Section */
.search-section {
    background: white;
    padding: 30px;
    border-radius: 10px;
    margin-bottom: 30px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.search-form {
    display: flex;
    gap: 10px;
}

.search-form input[type="text"] {
    flex: 1;
    padding: 12px 20px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 15px;
}

/* Student Cards */
.student-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 20px;
}

.student-card {
    background: white;
    border-radius: 10px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    overflow: hidden;
}

.student-card .card-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.student-card .card-header h3 {
    font-size: 18px;
}

.admission-badge {
    background: rgba(255, 255, 255, 0.2);
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 12px;
}

.student-card .card-body {
    padding: 20px;
}

.info-row {
    display: flex;
    justify-content: space-between;
    padding: 10px 0;
    border-bottom: 1px solid var(--border-color);
}

.info-row:last-child {
    border-bottom: none;
}

.info-row strong {
    color: var(--dark-color);
}

.student-card .card-footer {
    padding: 15px 20px;
    background: var(--light-color);
    border-top: 1px solid var(--border-color);
}

.student-card hr {
    margin: 15px 0;
    border: none;
    border-top: 1px solid var(--border-color);
}

.student-card h4 {
    font-size: 14px;
    color: var(--dark-color);
    margin-bottom: 10px;
}

/* Responsive Design */
@media (max-width: 768px) {
    .sidebar {
        width: 0;
        margin-left: -280px;
    }

    .main-content {
        margin-left: 0;
    }

    .form-grid {
        grid-template-columns: 1fr;
    }

    .dashboard-grid {
        grid-template-columns: 1fr;
    }

    .student-cards {
        grid-template-columns: 1fr;
    }

    .filter-form {
        flex-direction: column;
    }

    .filter-form input,
    .filter-form select {
        width: 100%;
    }
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--light-color);
}

::-webkit-scrollbar-thumb {
    background: var(--secondary-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--dark-color);
}