/* Module Header */
.module-header {
    margin-bottom: 3rem;
    animation: fadeIn 0.5s ease-out;
}

.module-title {
    font-size: 2.25rem;
    /* 36px */
    line-height: 1.2;
    font-weight: 800;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
}

.module-goal {
    font-size: 1.125rem;
    /* 18px */
    color: var(--color-text-secondary);
    line-height: 1.6;
    max-width: 65ch;
    margin-bottom: var(--spacing-lg);
}

.module-meta {
    background: #f8fafc;
    border-left: 4px solid var(--color-accent);
    padding: var(--spacing-lg);
    border-radius: 0 8px 8px 0;
}

.meta-title {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 700;
    color: var(--color-accent);
    margin-bottom: var(--spacing-sm);
    display: block;
}

.meta-list {
    list-style: none;
    margin: 0;
}

.meta-list li {
    font-size: 0.95rem;
    color: var(--color-text-primary);
    margin-bottom: 0.5rem;
    display: flex;
    align-items: flex-start;
}

.meta-list li::before {
    content: "✓";
    margin-right: 0.75rem;
    color: var(--color-accent);
    font-weight: bold;
}

/* Chapter Cards */
.chapter-card {
    background: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    margin-bottom: var(--spacing-lg);
    transition: box-shadow 0.2s ease, border-color 0.2s ease;
    overflow: hidden;
}

.chapter-card:hover {
    box-shadow: var(--shadow-md);
    border-color: #d1d5db;
    /* Gray 300 */
}

.chapter-header {
    padding: var(--spacing-lg);
    background: linear-gradient(to bottom, #ffffff, #f9fafb);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
}

.chapter-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text-primary);
}

.toggle-icon {
    color: var(--color-text-tertiary);
    transition: transform 0.3s ease;
}

.chapter-card.open .toggle-icon {
    transform: rotate(180deg);
    color: var(--color-text-primary);
}

.chapter-content {
    display: none;
    padding: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.chapter-card.open .chapter-content {
    display: block;
    animation: slideDown 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Topics List */
.section-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-weight: 700;
    color: var(--color-text-tertiary);
    margin-bottom: var(--spacing-md);
    display: block;
}

.topic-list {
    list-style: none;
    /* Removed grid for single column layout as requested */
    margin-bottom: var(--spacing-xl);
}

.topic-list li {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    padding: var(--spacing-xs) 0;
    display: flex;
    align-items: center;
}

.topic-list li::before {
    content: "";
    /* No bullet, specific design */
    width: 6px;
    height: 6px;
    background-color: var(--color-text-tertiary);
    border-radius: 50%;
    margin-right: 0.75rem;
}

/* Assignment Section */
.assignment-section {
    background-color: #fffbeb;
    /* Amber 50 */
    border: 1px solid #fde68a;
    /* Amber 200 */
    border-radius: 8px;
    padding: var(--spacing-lg);
}

.assignment-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    padding-bottom: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    color: #92400e;
    /* Amber 800 */
    font-weight: 700;
}

.subsection-title {
    font-size: 0.9rem;
    font-weight: 700;
    color: #b45309;
    /* Amber 700 */
    margin: var(--spacing-lg) 0 var(--spacing-sm);
    text-transform: uppercase;
    font-size: 0.8rem;
    letter-spacing: 0.05em;
}

.question-list {
    padding-left: 1.25rem;
}

.question-list li {
    margin-bottom: 0.5rem;
    color: #78350f;
    /* Amber 900 */
    font-size: 0.95rem;
}

/* Project Card */
.project-card {
    margin-top: 4rem;
    background: linear-gradient(135deg, #1f2937 0%, #111827 100%);
    /* Cool Dark Gradient */
    border-radius: 16px;
    padding: 3rem;
    /* Larger padding for emphasis */
    color: white;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    position: relative;
    overflow: hidden;
}

/* Decorative background circle */
.project-card::after {
    content: "";
    position: absolute;
    top: -50px;
    right: -50px;
    width: 200px;
    height: 200px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 50%;
    pointer-events: none;
}

.project-title {
    font-size: 1.75rem;
    font-weight: 800;
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.project-desc {
    font-size: 1.05rem;
    line-height: 1.7;
    color: #e5e7eb;
    /* Gray 200 */
    margin-bottom: var(--spacing-xl);
    white-space: pre-wrap;
}

.project-rules {
    background: rgba(255, 255, 255, 0.08);
    /* Glass effect */
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    padding: var(--spacing-lg);
}

.project-rules .section-label {
    color: #93c5fd;
    /* Light Blue */
    margin-bottom: var(--spacing-md);
}

.project-rules .meta-list li {
    color: #f3f4f6;
}

.project-rules .meta-list li::before {
    color: #60a5fa;
    /* Blue 400 */
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-5px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}