/* --- Global Styles & Variables --- */
:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    --white-color: #ffffff;
    --gray-color: #e9ecef;
    --font-family: 'Roboto', sans-serif;
}

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

body {
    font-family: var(--font-family);
    line-height: 1.6;
    background-color: var(--light-color);
    color: var(--dark-color);
}

.container {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1rem;
}

/* --- Header & Navigation --- */
header {
    background-color: var(--white-color);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
}

.nav-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
}

.nav-menu {
    display: flex;
    list-style: none;
}

.nav-item {
    margin-left: 1.5rem;
}

.nav-link {
    color: var(--dark-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: var(--primary-color);
}

/* --- Main Content --- */
.content-wrapper {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.content-wrapper h1 {
    color: var(--dark-color);
    margin-bottom: 1rem;
    border-bottom: 3px solid var(--warning-color);
    padding-bottom: 0.5rem;
}

.topic-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.topic-card {
    background-color: var(--white-color);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.05);
    border-left: 5px solid var(--success-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.topic-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0,0,0,0.1);
    background-color: #f9f9f9;
}

.topic-hint {
    font-size: 0.85rem;
    color: var(--secondary-color);
    font-style: italic;
    margin-top: 1rem;
    text-align: right;
}

.topic-card h2 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.topic-card ul {
    list-style-type: none;
    padding-left: 1rem;
}

.topic-card li {
    margin-bottom: 0.5rem;
}

.topic-card a {
    color: var(--primary-color);
    text-decoration: none;
}

.topic-card a:hover {
    text-decoration: underline;
}

.content-section {
    background-color: var(--white-color);
    padding: 2rem;
    margin: 2rem auto;
    max-width: 900px;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.05);
}

.content-section h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.content-path {
    font-size: 0.9rem;
    color: var(--secondary-color);
    font-style: italic;
    margin-bottom: 1rem;
}

.section-content {
    margin-bottom: 1.5rem;
    text-align: justify;
}

.code-viewer {
    background-color: #2d2d2d;
    color: #f8f8f2;
    padding: 1.5rem;
    border-radius: 5px;
    overflow-x: auto;
    font-family: 'Courier New', Courier, monospace;
    white-space: pre-wrap;
}

.code-viewer pre {
    margin: 0;
}

/* --- Footer --- */
footer {
    text-align: center;
    padding: 2rem 1rem;
    margin-top: 3rem;
    background-color: var(--dark-color);
    color: var(--white-color);
}

/* --- Admin Panel Styles --- */
.admin-container {
    display: flex;
    min-height: calc(100vh - 200px);
    max-width: 1400px;
    margin: 0 auto;
}

.admin-sidebar {
    width: 250px;
    background-color: var(--dark-color);
    color: var(--white-color);
    padding: 2rem 1rem;
    position: sticky;
    top: 80px;
    max-height: calc(100vh - 80px);
    overflow-y: auto;
}

.sidebar-header {
    margin-bottom: 2rem;
    border-bottom: 2px solid rgba(255,255,255,0.2);
    padding-bottom: 1rem;
}

.sidebar-header h3 {
    color: var(--white-color);
    font-size: 1.2rem;
    margin: 0;
}

.admin-nav {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.admin-nav-item {
    display: flex;
    align-items: center;
    padding: 0.75rem 1rem;
    color: var(--white-color);
    text-decoration: none;
    border-radius: 5px;
    transition: background-color 0.3s ease;
}

.admin-nav-item:hover {
    background-color: var(--primary-color);
}

.admin-nav-item .icon {
    font-size: 1.3rem;
    margin-right: 0.75rem;
}

.admin-nav-item .label {
    font-weight: 500;
}

.admin-content {
    flex: 1;
    padding: 2rem;
}

.admin-dashboard {
    width: 100%;
}

.admin-dashboard h1 {
    margin-bottom: 1rem;
    color: var(--dark-color);
}

.admin-dashboard > p {
    margin-bottom: 2rem;
    color: var(--secondary-color);
}

.admin-menu-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.admin-menu-item {
    background-color: var(--white-color);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.05);
    text-align: center;
    text-decoration: none;
    color: var(--dark-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border-top: 5px solid var(--primary-color);
}

.admin-menu-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 16px rgba(0,0,0,0.1);
}

.admin-menu-item h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.admin-menu-item p {
    color: var(--secondary-color);
    font-size: 0.9rem;
}

/* --- CRUD Form & List Styles --- */
.admin-manage h1 {
    margin-bottom: 2rem;
}

.crud-form, .crud-list {
    background-color: var(--white-color);
    padding: 2rem;
    margin-bottom: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.05);
}

.crud-form h2, .crud-list h2 {
    margin-bottom: 1.5rem;
    color: var(--primary-color);
    border-bottom: 2px solid var(--gray-color);
    padding-bottom: 0.5rem;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-family: var(--font-family);
}

.form-group textarea {
    resize: vertical;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
}

table th, table td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--gray-color);
}

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

/* --- Buttons --- */
.btn {
    display: inline-block;
    padding: 0.6rem 1.2rem;
    border: none;
    border-radius: 4px;
    text-decoration: none;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.3s ease, color 0.3s ease;
    margin-right: 0.5rem;
}

.btn-primary {
    background-color: var(--primary-color);
    color: var(--white-color);
}
.btn-primary:hover {
    background-color: #0056b3;
}

.btn-secondary {
    background-color: var(--secondary-color);
    color: var(--white-color);
}
.btn-secondary:hover {
    background-color: #5a6268;
}

.btn-warning {
    background-color: var(--warning-color);
    color: var(--dark-color);
}
.btn-warning:hover {
    background-color: #e0a800;
}

.btn-danger {
    background-color: var(--danger-color);
    color: var(--white-color);
}
.btn-danger:hover {
    background-color: #c82333;
}

/* --- Messages --- */
.message, .error {
    padding: 1rem;
    margin-bottom: 1rem;
    border-radius: 4px;
}
.message {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}
.error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

/* --- Form Container (for login) --- */
.form-container {
    max-width: 400px;
    margin: 3rem auto;
    padding: 2rem;
    background-color: var(--white-color);
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.05);
}

/* --- Sortable List --- */
#sortable-list {
    list-style: none;
    padding: 0;
}

.sortable-item {
    display: flex;
    align-items: center;
    background-color: #f9f9f9;
    border: 1px solid #ddd;
    padding: 1rem;
    margin-bottom: 0.5rem;
    border-radius: 4px;
    cursor: move;
}

.sortable-item .handle {
    font-size: 1.2rem;
    color: #aaa;
    margin-right: 1rem;
}

.sortable-item .item-content {
    flex-grow: 1;
}

.sortable-item .item-content strong {
    display: block;
    margin-bottom: 0.25rem;
}

.sortable-item.dragging {
    opacity: 0.5;
}

/* --- Responsive Design --- */
@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
    }

    .nav-menu {
        margin-top: 1rem;
        padding: 0;
    }

    .nav-item {
        margin: 0 0.5rem;
    }

    .topic-list, .admin-menu-grid {
        grid-template-columns: 1fr;
    }

    .container {
        padding: 0 0.5rem;
    }

    .crud-form, .crud-list, .content-section {
        padding: 1rem;
    }

    table {
        font-size: 0.9rem;
    }
    
    .btn {
        display: block;
        width: 100%;
        margin-bottom: 0.5rem;
        text-align: center;
    }

    /* Admin Container Responsive */
    .admin-container {
        flex-direction: column;
    }

    .admin-sidebar {
        width: 100%;
        position: static;
        max-height: none;
        padding: 1rem;
        margin-bottom: 2rem;
    }

    .admin-nav {
        flex-direction: row;
        flex-wrap: wrap;
        gap: 0.5rem;
    }

    .admin-nav-item {
        flex: 1;
        min-width: 120px;
        justify-content: center;
        font-size: 0.9rem;
        padding: 0.5rem;
    }

    .admin-nav-item .label {
        display: none;
    }

    .admin-content {
        padding: 1rem;
    }

    .content-wrapper {
        padding: 0 1rem;
    }
}