/* --- Base Styles Provided By You --- */

/* General Body Styles */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding-top: 80px; /* Space for fixed header */
    padding-bottom: 50px; /* Space for fixed footer */
    background-color: var(--background-color);
    color: var(--text-color);
}

/* Header Banner */
.main-header {
    background-color: var(--primary-color);
    color: white;
    padding: 15px 20px;
    text-align: center;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
}
.main-header h1 {
    margin: 0;
    font-size: 2em;
}

/* Main Content Container */
.container {
    max-width: 1200px;
    margin: 40px auto;
    padding: 0 20px;
}

/* Page Title */
.page-title {
    text-align: center;
    color: var(--secondary-color); /* Using red as requested */
    margin-bottom: 40px;
    font-size: 2.2em;
    font-weight: bold;
}

/* Unified Card Grid */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 25px;
}

/* Unified Card Style */
.card {
    background-color: var(--card-background-color);
    border-radius: 12px;
    padding: 25px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.07);
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    border: 2px solid var(--primary-color);
    text-align: center;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    position: relative; /* Essential for visual identity system */
    overflow: hidden;  /* Keeps watermarks inside */
}
.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
}
.card h2 {
    margin: 0;
    font-size: 1.3em;
    color: inherit;
    position: relative; /* Ensures title is above watermarks */
    z-index: 2;
}

/* Toolbar for buttons */
.toolbar {
    margin-bottom: 30px;
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

/* Footer */
.main-footer {
    background-color: var(--footer-background-color);
    color: #6c757d;
    padding: 15px 0;
    text-align: center;
    position: fixed;
    bottom: 0;
    width: 100%;
    font-size: 0.9em;
    border-top: 1px solid #dee2e6;
}

/* --- Visual Identity System (Merged) --- */

/* Stylish Back Button */
.back-link {
    display: inline-block;
    margin-bottom: 25px;
    background-color: transparent;
    color: var(--secondary-color);
    border: 2px solid var(--secondary-color);
    padding: 8px 20px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.2s ease;
}
.back-link:hover {
    background-color: var(--secondary-color);
    color: white;
    transform: translateY(-2px);
}

/* Base style for icons/tags */
.card h2::before {
    font-family: "Font Awesome 6 Free";
    font-weight: 900;
    margin-right: 10px;
    font-size: 0.9em;
}
.card.card--lesson h2::before {
    content: "\f518"; /* book-open */
}

/* Quiz Card Identity */
.card.card--quiz {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}
.card.card--quiz h2::before {
    content: "MCQs";
    font-family: 'Segoe UI', sans-serif;
    font-weight: 700;
    padding: 3px 8px;
    border: 2px solid white;
    border-radius: 6px;
    font-size: 0.7em;
    vertical-align: middle;
    margin-right: 12px;
}

/* Flashcards Deck Identity */
.card.card--flashcards {
    background-color: #7c3aed;
    color: white;
    border-color: #7c3aed;
}
.card.card--flashcards h2::before {
    content: "\f24d"; /* clone */
}

/* Watermark Styles */
.card.card--quiz::after,
.card.card--flashcards::after {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) rotate(-20deg);
    font-size: 5rem;
    font-weight: 800;
    color: rgba(255, 255, 255, 0.1);
    z-index: 1;
    pointer-events: none;
    font-family: 'Segoe UI', Tahoma, sans-serif;
}
.card.card--quiz::after {
    content: "MCQS";
}
.card.card--flashcards::after {
    content: "CARDS";
}