/* =================================
   CSS VARIABLES (Light & Dark Mode)
   ================================= */
:root {
    /* Light Mode */
    --body-background: #f0f2f5;
    --body-text-color: #333;
    --container-background: #ffffff;
    --container-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    --heading-color: #2c3e50;
    --subheading-border: #eee;
    --form-label-color: #34495e;
    --input-background: #ffffff;
    --input-border: #ccc;
    --submit-btn-background: #28a745;
    --submit-btn-hover: #218838;
    --message-success-bg: #d4edda;
    --message-success-text: #155724;
    --message-success-border: #c3e6cb;
    --message-error-bg: #f8d7da;
    --message-error-text: #721c24;
    --message-error-border: #f5c6cb;
    --video-item-background: #f9f9f9;
    --video-item-border: #ddd;
    --video-item-shadow: 0 2px 5px rgba(0, 0, 0, 0.08);
    --video-item-text: #555;
    --video-meta-text: #777;
    --video-meta-border: #eee;
    --action-btn-background: #007bff;
    --action-btn-hover: #0056b3;
    --delete-btn-background: #dc3545;
    --delete-btn-hover: #c82333;
    --link-color: #007bff;
}

/* Dark Mode - Activated by System Preference or Manual Toggle */
@media (prefers-color-scheme: dark) {
    :root {
        --body-background: #1a1a1a;
        --body-text-color: #e0e0e0;
        --container-background: #2a2a2a;
        --container-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
        --heading-color: #e0e0e0;
        --subheading-border: #444;
        --form-label-color: #a0a0a0;
        --input-background: #333;
        --input-border: #555;
        --submit-btn-background: #238636;
        --submit-btn-hover: #1f6e2b;
        --message-success-bg: #3c5443;
        --message-success-text: #d4edda;
        --message-success-border: #506d54;
        --message-error-bg: #6a3d3d;
        --message-error-text: #f8d7da;
        --message-error-border: #7e4b4b;
        --video-item-background: #333;
        --video-item-border: #444;
        --video-item-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
        --video-item-text: #ccc;
        --video-meta-text: #a0a0a0;
        --video-meta-border: #555;
        --action-btn-background: #6a9ce0;
        --action-btn-hover: #5587d6;
        --delete-btn-background: #8b3c43;
        --delete-btn-hover: #7b2a31;
        --link-color: #6a9ce0;
    }
}

body[data-theme='dark'] {
    /* Same as above, repeated for manual toggle */
    --body-background: #1a1a1a;
    --body-text-color: #e0e0e0;
    --container-background: #2a2a2a;
    --container-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
    --heading-color: #e0e0e0;
    --subheading-border: #444;
    --form-label-color: #a0a0a0;
    --input-background: #333;
    --input-border: #555;
    --submit-btn-background: #238636;
    --submit-btn-hover: #1f6e2b;
    --message-success-bg: #3c5443;
    --message-success-text: #d4edda;
    --message-success-border: #506d54;
    --message-error-bg: #6a3d3d;
    --message-error-text: #f8d7da;
    --message-error-border: #7e4b4b;
    --video-item-background: #333;
    --video-item-border: #444;
    --video-item-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
    --video-item-text: #ccc;
    --video-meta-text: #a0a0a0;
    --video-meta-border: #555;
    --action-btn-background: #6a9ce0;
    --action-btn-hover: #5587d6;
    --delete-btn-background: #8b3c43;
    --delete-btn-hover: #7b2a31;
    --link-color: #6a9ce0;
}

/* =================================
   VIDEOS PAGE SPECIFIC STYLES
   ================================= */

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--body-background);
    color: var(--main-text-color);
    transition: background-color 0.3s ease, color 0.3s ease;
    padding-top: 140px;
    margin: 0;
}

.game-page {
    flex-grow: 1;
    margin-left: auto;
    margin-right: auto;
    width: 100%;
    max-width: 1200px;
    box-sizing: border-box;
    padding: 20px 0;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.container {
    background-color: var(--container-background);
    padding: 30px;
    border-radius: 8px;
    box-shadow: var(--container-shadow);
    max-width: 900px;
    width: 100%;
    margin-top: 100px;
    flex-shrink: 0;
    margin-bottom: 20px;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

h1 {
    color: var(--heading-color);
    font-size: 2.2em;
    margin-bottom: 15px;
    text-align: left;
    transition: color 0.3s ease;
}

h2 {
    color: var(--heading-color);
    font-size: 1.8em;
    margin-top: 30px;
    margin-bottom: 15px;
    border-bottom: 2px solid var(--subheading-border);
    padding-bottom: 5px;
    transition: color 0.3s ease, border-color 0.3s ease;
}

.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.video-item {
    background-color: var(--video-item-background);
    border: 1px solid var(--video-item-border);
    border-radius: 8px;
    padding: 15px;
    box-shadow: var(--video-item-shadow);
    display: flex;
    flex-direction: column;
    transition: background-color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.video-item iframe {
    width: 100%;
    aspect-ratio: 16 / 9;
    border: none;
    border-radius: 4px;
    margin-bottom: 10px;
}

.video-item p {
    font-size: 0.9em;
    color: var(--video-item-text);
    margin-bottom: 5px;
    transition: color 0.3s ease;
}

.video-item .meta {
    font-size: 0.8em;
    color: var(--video-meta-text);
    margin-top: auto;
    padding-top: 10px;
    border-top: 1px solid var(--video-meta-border);
    transition: color 0.3s ease, border-color 0.3s ease;
}

.back-link {
    display: block;
    margin-top: 20px;
    color: var(--link-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

.back-link:hover {
    text-decoration: underline;
}