/* Base Styles & Theme Variables */
:root {
    /* Light theme */
    --background-color: #f8f9fa;
    --text-color: #212529;
    --primary-color: #3498db;
    --secondary-color: #2ecc71;
    --accent-color: #e74c3c;
    --muted-color: #95a5a6;
    --border-color: #dee2e6;
    --card-bg: #ffffff;
    --header-bg: #ffffff;
    --footer-bg: #f1f1f1;
    --shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    --hover-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    --block-bg: #f8f9fa;
    --block-border: 1px solid #dee2e6;
    --input-bg: #ffffff;
    --btn-primary-bg: var(--primary-color);
    --btn-primary-text: #ffffff;
    --btn-secondary-bg: #6c757d;
    --btn-secondary-text: #ffffff;
    --modal-bg: #ffffff;
}

[data-theme="dark"] {
    /* Dark theme */
    --background-color: #121212;
    --text-color: #e0e0e0;
    --primary-color: #3498db;
    --secondary-color: #2ecc71;
    --accent-color: #e74c3c;
    --muted-color: #95a5a6;
    --border-color: #333333;
    --card-bg: #1e1e1e;
    --header-bg: #1a1a1a;
    --footer-bg: #1a1a1a;
    --shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
    --hover-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
    --block-bg: #1e1e1e;
    --block-border: 1px solid #333333;
    --input-bg: #2c2c2c;
    --btn-primary-bg: var(--primary-color);
    --btn-primary-text: #ffffff;
    --btn-secondary-bg: #555555;
    --btn-secondary-text: #ffffff;
    --modal-bg: #1e1e1e;
}

/* General Styles */
body {
    background-color: var(--background-color);
    color: var(--text-color);
    font-family: 'Roboto', 'Segoe UI', 'Arial', sans-serif;
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
    margin: 0;
    padding: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: #2980b9;
    text-decoration: underline;
}

/* Header Styles */
.main-header {
    background-color: var(--header-bg);
    padding: 1rem 0;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.site-title {
    font-size: 1.8rem;
    font-weight: bold;
    margin: 0;
}

.site-title a {
    color: var(--text-color);
    text-decoration: none;
}

/* Theme Toggle */
.theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-color);
    font-size: 1.5rem;
    padding: 0.5rem;
    transition: color 0.3s ease, transform 0.3s ease;
}

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

/* Main Content */
.main-content {
    flex: 1;
    padding: 2rem 0;
}

/* Subject Selection Cards */
.subject-card {
    background-color: var(--card-bg);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow);
    transition: box-shadow 0.3s ease, transform 0.3s ease;
    cursor: pointer;
}

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

.subject-card h3 {
    margin-top: 0;
    margin-bottom: 1rem;
    font-size: 1.5rem;
    color: var(--text-color);
}

/* Subject Color-Coding */
.subject-indicator {
    width: 100%;
    height: 8px;
    border-radius: 4px;
    margin-bottom: 1rem;
}

/* Content Blocks Styling */
.content-block {
    background-color: var(--block-bg);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
    border: var(--block-border);
    transition: box-shadow 0.3s ease;
    overflow: hidden;
}

.content-block:hover {
    box-shadow: var(--hover-shadow);
}

.content-block-title {
    font-size: 1.4rem;
    font-weight: bold;
    margin-top: 0;
    margin-bottom: 1rem;
    color: var(--text-color);
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--primary-color);
}

.content-block-content {
    line-height: 1.7;
}

/* Image positioning styles */
.block-with-image {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    align-items: flex-start;
}

.block-with-image.image-left {
    flex-direction: row;
}

.block-with-image.image-right {
    flex-direction: row-reverse;
}

.block-with-image.image-top {
    flex-direction: column;
}

.block-image-container {
    flex: 0 0 auto;
    max-width: 30%;
    margin-bottom: 1rem;
}

.block-with-image.image-top .block-image-container {
    max-width: 100%;
    margin-bottom: 1.5rem;
}

.block-image {
    width: 100%;
    height: auto;
    border-radius: 6px;
    box-shadow: var(--shadow);
}

.block-content-container {
    flex: 1;
}

@media (max-width: 768px) {
    .block-with-image {
        flex-direction: column !important;
    }
    
    .block-image-container {
        max-width: 100%;
        margin-bottom: 1.5rem;
    }
}

/* Category Selection UI */
.selection-container {
    background-color: var(--card-bg);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
}

.selection-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

.selection-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.selection-item {
    padding: 0.5rem 0.8rem;
    margin-bottom: 0.5rem;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.selection-item:hover {
    background-color: rgba(52, 152, 219, 0.1);
}

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

/* Content Viewer */
.content-viewer {
    background-color: var(--card-bg);
    border-radius: 8px;
    padding: 2rem;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.content-title {
    font-size: 2rem;
    margin-top: 0;
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--primary-color);
}

/* Buttons */
.btn {
    display: inline-block;
    font-weight: 500;
    text-align: center;
    white-space: nowrap;
    vertical-align: middle;
    user-select: none;
    border: 1px solid transparent;
    padding: 0.5rem 1rem;
    font-size: 1rem;
    line-height: 1.5;
    border-radius: 0.25rem;
    transition: all 0.15s ease-in-out;
    cursor: pointer;
}

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

.btn-primary:hover {
    background-color: #2980b9;
    color: white;
}

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

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

/* Form Elements */
input, select, textarea {
    background-color: var(--input-bg);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 0.75rem 1rem;
    width: 100%;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

input:focus, select:focus, textarea:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.25);
}

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

.form-group {
    margin-bottom: 1.5rem;
}

/* Footer */
.main-footer {
    background-color: var(--footer-bg);
    padding: 2rem 0;
    box-shadow: 0 -2px 5px rgba(0, 0, 0, 0.05);
    margin-top: auto;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
}

.footer-links {
    list-style: none;
    padding: 0;
    display: flex;
    gap: 1.5rem;
}

.feedback-form {
    margin-top: 1rem;
}

.feedback-title {
    font-size: 1.2rem;
    margin-bottom: 0.75rem;
}

/* Admin specific styles */
.admin-container {
    background-color: var(--card-bg);
    border-radius: 8px;
    padding: 2rem;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.admin-title {
    margin-top: 0;
    margin-bottom: 1.5rem;
    font-size: 1.8rem;
    color: var(--text-color);
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 0.5rem;
}

.admin-sidebar {
    background-color: var(--block-bg);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
}

.admin-nav {
    list-style: none;
    padding: 0;
    margin: 0;
}

.admin-nav-item {
    margin-bottom: 0.5rem;
}

.admin-nav-link {
    display: block;
    padding: 0.75rem 1rem;
    border-radius: 4px;
    color: var(--text-color);
    text-decoration: none;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.admin-nav-link:hover, .admin-nav-link.active {
    background-color: var(--primary-color);
    color: white;
}

.admin-nav-link i {
    margin-right: 0.5rem;
    width: 20px;
    text-align: center;
}

.admin-card {
    background-color: var(--block-bg);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow);
    border-left: 4px solid var(--primary-color);
}

.admin-card-title {
    font-size: 1.2rem;
    margin-top: 0;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.admin-stat {
    font-size: 2.5rem;
    font-weight: bold;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

/* Editor styles */
.editor-container {
    background-color: var(--block-bg);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
}

.block-editor {
    background-color: var(--card-bg);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow);
    border: var(--block-border);
    position: relative;
}

.block-editor-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

.block-editor-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin: 0;
}

.block-editor-actions {
    display: flex;
    gap: 0.5rem;
}

.block-handle {
    cursor: move;
    padding: 0.25rem 0.5rem;
    margin-right: 0.5rem;
    background-color: var(--border-color);
    border-radius: 4px;
}

.image-preview {
    max-width: 100%;
    height: auto;
    margin-top: 1rem;
    border-radius: 6px;
    box-shadow: var(--shadow);
}

.image-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.gallery-item {
    position: relative;
    border-radius: 6px;
    overflow: hidden;
    box-shadow: var(--shadow);
    cursor: pointer;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.gallery-item:hover {
    transform: scale(1.05);
    box-shadow: var(--hover-shadow);
}

.gallery-image {
    width: 100%;
    height: 120px;
    object-fit: cover;
    display: block;
}

.gallery-image-select {
    position: absolute;
    top: 5px;
    right: 5px;
    background-color: rgba(0, 0, 0, 0.5);
    color: white;
    border: none;
    border-radius: 50%;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Login screen */
.login-container {
    max-width: 400px;
    margin: 3rem auto;
    background-color: var(--card-bg);
    border-radius: 8px;
    padding: 2rem;
    box-shadow: var(--shadow);
}

.login-logo {
    text-align: center;
    margin-bottom: 2rem;
}

.login-title {
    font-size: 1.8rem;
    text-align: center;
    margin-bottom: 2rem;
}

/* Responsive design adjustments */
@media (max-width: 992px) {
    .container {
        max-width: 100%;
        padding-left: 1rem;
        padding-right: 1rem;
    }
}

@media (max-width: 576px) {
    .subject-card {
        padding: 1rem;
    }
    
    .content-viewer {
        padding: 1.5rem;
    }
    
    .admin-container {
        padding: 1.5rem;
    }
    
    .content-title {
        font-size: 1.6rem;
    }
}

/* Animation keyframes */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.fade-in {
    animation: fadeIn 0.5s ease-in;
}

@keyframes slideInUp {
    from {
        transform: translateY(50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.slide-in-up {
    animation: slideInUp 0.5s ease-out;
}

/* Utility classes */
.text-center {
    text-align: center;
}

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.alert {
    padding: 1rem;
    margin-bottom: 1rem;
    border-radius: 4px;
}

.alert-success {
    background-color: rgba(46, 204, 113, 0.2);
    color: #2ecc71;
    border: 1px solid rgba(46, 204, 113, 0.3);
}

.alert-danger {
    background-color: rgba(231, 76, 60, 0.2);
    color: #e74c3c;
    border: 1px solid rgba(231, 76, 60, 0.3);
}

.alert-warning {
    background-color: rgba(241, 196, 15, 0.2);
    color: #f1c40f;
    border: 1px solid rgba(241, 196, 15, 0.3);
}

.alert-info {
    background-color: rgba(52, 152, 219, 0.2);
    color: #3498db;
    border: 1px solid rgba(52, 152, 219, 0.3);
}