:root {
    --color-year-0: #4caf50;
    --color-year-0-light: #81c784;
    --theme-color: var(--color-year-0);
    --theme-color-light: var(--color-year-0-light);
    --bg-color: #f8f9fa;
    --text-dark: #343a40;
    --text-light: #6c757d;
    --card-bg: #ffffff;
    --border-color: #dee2e6;
    --card-shadow: 0 4px 15px rgba(0, 0, 0, 0.06);
}

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

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-dark);
    line-height: 1.6;
}

.year-header {
    background: linear-gradient(45deg, var(--theme-color), var(--theme-color-light));
    color: white;
    padding: 2rem;
    text-align: center;
    position: relative;
}

.year-header h1 {
    font-size: 2.2rem;
    text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.2);
}

.back-link {
    position: absolute;
    top: 50%;
    left: 2rem;
    transform: translateY(-50%);
    color: white;
    text-decoration: none;
    font-weight: 600;
    background: rgba(255, 255, 255, 0.2);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    transition: background 0.3s ease;
}

.back-link:hover {
    background: rgba(255, 255, 255, 0.3);
}

.container {
    max-width: 900px;
    margin: 2rem auto;
    padding: 0 2rem;
}

main {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
}

main h2 {
    color: var(--theme-color);
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

main p {
    margin-bottom: 1rem;
}

footer {
    text-align: center;
    padding: 2rem 1rem;
    color: var(--text-light);
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .year-header {
        padding-bottom: 1rem;
    }
    .back-link {
        position: static;
        transform: none;
        display: inline-block;
        margin-top: 1rem;
    }
}

/* Page-specific styles for week pages */
.content-section {
    margin-bottom: 2rem;
}
.assessment-details {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    margin-top: 2rem;
    background-color: #fdfdfd;
}
.assessment-details h3 {
    color: var(--theme-color);
    margin-bottom: 1rem;
    font-size: 1.5rem;
}
.assessment-details h4 {
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
    font-size: 1.2rem;
    color: var(--text-dark);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.25rem;
}
.assessment-details ul, .assessment-details ol {
    padding-left: 20px;
}
.assessment-details li {
    margin-bottom: 0.75rem;
}
.assessment-details .question-list {
    list-style-type: decimal;
    padding-left: 25px;
}
.assessment-details .sub-question {
    list-style-type: lower-alpha;
    padding-left: 20px;
    margin-top: 0.5rem;
}
.solution-request {
    background-color: #eef7f6;
    border: 1px solid var(--theme-color-light);
    border-left: 4px solid var(--theme-color);
    padding: 1rem 1.5rem;
    border-radius: 8px;
    margin-top: 2rem;
}
.solution-request a {
    font-weight: 600;
    color: var(--theme-color);
    text-decoration: none;
}
.solution-request a:hover {
    text-decoration: underline;
}
.download-links {
    margin-top: 2rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}
.download-links a {
    display: flex;
    align-items: center;
    text-decoration: none;
    gap: 0.75rem;
    background-color: #f1f3f5;
    color: var(--text-dark);
    padding: 0.85rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    border: 1px solid var(--border-color);
    transition: all 0.2s ease-in-out;
}
.download-links a:hover {
    background-color: #e9ecef;
    transform: translateY(-2px);
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}
.download-links a svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    color: var(--text-light);
}
.info-container {
    margin-top: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}
.info-box {
    background-color: #f8f9fa;
    border: 1px solid var(--border-color);
    padding: 1rem 1.5rem;
    border-radius: 8px;
}
.download-links a.disabled { 
    pointer-events: none; 
    color: gray; 
    opacity: 0.5; 
}