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

:root {
    --dark-bg-primary: #0a0e17;
    --dark-bg-secondary: #141824;
    --dark-bg-tertiary: #1e2433;
    --dark-text-primary: #e8eaed;
    --dark-text-secondary: #9ca3af;
    --dark-accent-blue: #4c8bf5;
    --dark-accent-cyan: #00b4d8;
    --dark-border: #2d3748;

    --day-bg-primary: #f5f1ed;
    --day-bg-secondary: #ffffff;
    --day-bg-tertiary: #e8dfd6;
    --day-text-primary: #1a1a1a;
    --day-text-secondary: #666666;
    --day-accent-brown: #8b6f47;
    --day-accent-orange: #d97706;
    --day-border: #d4c5b9;

    --bg-primary: var(--dark-bg-primary);
    --bg-secondary: var(--dark-bg-secondary);
    --bg-tertiary: var(--dark-bg-tertiary);
    --text-primary: var(--dark-text-primary);
    --text-secondary: var(--dark-text-secondary);
    --accent-primary: var(--dark-accent-blue);
    --accent-secondary: var(--dark-accent-cyan);
    --border-color: var(--dark-border);

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;

    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    --font-mono: 'Courier New', Courier, monospace;

    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.4);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.5);
}

[data-theme="light"] {
    --bg-primary: var(--day-bg-primary);
    --bg-secondary: var(--day-bg-secondary);
    --bg-tertiary: var(--day-bg-tertiary);
    --text-primary: var(--day-text-primary);
    --text-secondary: var(--day-text-secondary);
    --accent-primary: var(--day-accent-brown);
    --accent-secondary: var(--day-accent-orange);
    --border-color: var(--day-border);

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.2);
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Navbar Styles */
.navbar-not-hero {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
}

.nav-links-left {
    display: flex;
    list-style: none;
    justify-content: flex-start;
    gap: 2rem;
}

.nav-logo {
    display: flex;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    cursor: pointer;
}

.nav-links-right {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
    justify-content: flex-end;
}

.nav-links-left a,
.nav-links-right a {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    font-size: 1.1rem;
    transition: color 0.3s ease;
}

.nav-links-left a:hover,
.nav-links-right a:hover {
    color: var(--accent-primary);
}

.theme-toggle {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    padding: 10px;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1.2rem;
    width: 45px;
    height: 45px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle:hover {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    transform: scale(1.05);
}

/* Theme toggle icon fix for document-detail */
.theme-toggle .sun-icon,
.theme-toggle .moon-icon {
    display: none;
}

[data-theme="dark"] .theme-toggle .moon-icon {
    display: inline;
}

[data-theme="light"] .theme-toggle .sun-icon {
    display: inline;
}

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--text-primary);
    transition: all 0.3s ease;
}

/* Library Specific Styles */
.library-main {
    min-height: calc(100vh - 120px);
    padding-top: 80px;
}

.library-hero {
    background-color: var(--bg-secondary);
    padding: var(--spacing-xl) 0;
    border-bottom: 1px solid var(--border-color);
}

.page-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.page-subtitle {
    font-size: 1.15rem;
    color: var(--text-secondary);
}

.library-content {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: var(--spacing-xl);
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-md);
}

.filter-toggle-mobile {
    display: none;
    width: 100%;
    padding: var(--spacing-md);
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    justify-content: space-between;
    align-items: center;
}

.filters-sidebar {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    height: fit-content;
    position: sticky;
    top: 100px;
}

.filters-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.filters-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
}

.filters-clear {
    background: none;
    border: none;
    color: var(--accent-primary);
    font-weight: 600;
    font-size: 0.9rem;
    padding: var(--spacing-xs);
    transition: color 0.2s ease;
    cursor: pointer;
}

.filters-clear:hover {
    color: var(--accent-secondary);
}

.filter-group {
    margin-bottom: var(--spacing-lg);
}

.filter-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.filter-options {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.filter-option {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xs);
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: background-color 0.2s ease;
}

.filter-option:hover {
    background-color: var(--bg-tertiary);
}

.filter-option input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--accent-primary);
}

.filter-option span {
    color: var(--text-primary);
    font-size: 0.95rem;
}

.library-results {
    min-height: 500px;
}

.results-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
}

.results-count {
    font-weight: 600;
    color: var(--text-primary);
}

.sort-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.sort-controls label {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.sort-select {
    padding: var(--spacing-xs) var(--spacing-md);
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.sort-select:hover {
    border-color: var(--accent-primary);
}

.sort-select:focus {
    outline: none;
    border-color: var(--accent-primary);
}

.documents-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--spacing-lg);
}

.document-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all 0.3s ease;
}

.document-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent-primary);
}

.document-preview {
    width: 100%;
    height: 200px;
    background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--bg-secondary) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-color);
}

.document-content {
    padding: var(--spacing-lg);
}

.document-number {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent-primary);
    margin-bottom: var(--spacing-xs);
}

.document-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
    line-height: 1.4;
}

.document-snippet {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.5;
    margin-bottom: var(--spacing-md);
}

.document-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
}

.document-tag {
    font-size: 0.8rem;
    padding: 4px 10px;
    background-color: var(--bg-tertiary);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
}

.document-link {
    display: inline-block;
    color: var(--accent-primary);
    font-weight: 600;
    font-size: 0.9rem;
    transition: all 0.2s ease;
    text-decoration: none;
}

.document-link:hover {
    color: var(--accent-secondary);
    transform: translateX(4px);
}

.empty-state {
    text-align: center;
    padding: var(--spacing-2xl);
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
}

.empty-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

.empty-state h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

.empty-state p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

.empty-btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    background-color: var(--accent-primary);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    transition: all 0.3s ease;
    cursor: pointer;
}

.empty-btn:hover {
    background-color: var(--accent-secondary);
    transform: translateY(-2px);
}

/* Footer Styles */
.footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-lg) 0;
    margin-top: var(--spacing-2xl);
    text-align: center;
}

.footer p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .library-content {
        grid-template-columns: 1fr;
    }

    .filter-toggle-mobile {
        display: flex;
    }

    .filters-sidebar {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        z-index: 2000;
        height: 100vh;
        overflow-y: auto;
        transform: translateX(-100%);
        transition: transform 0.3s ease;
    }

    .filters-sidebar.active {
        transform: translateX(0);
    }

    .documents-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    }
}

@media (max-width: 768px) {
    .mobile-toggle {
        display: flex;
    }

    .nav-links-left,
    .nav-links-right {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--bg-secondary);
        flex-direction: column;
        padding: var(--spacing-md);
        gap: var(--spacing-sm);
        border-bottom: 1px solid var(--border-color);
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: all 0.3s ease;
    }

    .nav-links-left.active,
    .nav-links-right.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }

    .nav-logo {
        font-size: 1.2rem;
    }

    .results-toolbar {
        flex-direction: column;
        gap: var(--spacing-sm);
        align-items: stretch;
    }

    .sort-controls {
        justify-content: space-between;
    }

    .documents-grid {
        grid-template-columns: 1fr;
    }

    .page-title {
        font-size: 2rem;
    }
}

@media (max-width: 640px) {
    .documents-grid {
        grid-template-columns: 1fr;
    }
}

/* Challenge Section Styles */
.challenge-section {
    margin-bottom: 4rem !important;
}

.challenge-banner {
    background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
    padding: 3rem;
    border-radius: var(--radius-xl);
    display: flex;
    gap: 2rem;
    align-items: center;
    color: white;
}

[data-theme="day"] .challenge-banner {
    background: linear-gradient(135deg, var(--day-accent-brown) 0%, var(--day-accent-orange) 100%);
}

.challenge-icon {
    font-size: 4rem;
    flex-shrink: 0;
}

.challenge-text h2 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.challenge-text h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    opacity: 0.9;
}

.challenge-text p {
    font-size: 1.1rem;
    line-height: 1.7;
}

/* Overview Section */
.overview-section {
    text-align: center;
}

.overview-text {
    max-width: 800px;
    margin: 0 auto 3rem;
    font-size: 1.2rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.features-showcase {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.feature-box {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    text-align: center;
    transition: all 0.3s ease;
}

.feature-box:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent-primary);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-box h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: var(--accent-primary);
}

.feature-box p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Responsive for challenge banner */
@media (max-width: 768px) {
    .challenge-banner {
        flex-direction: column;
        text-align: center;
        padding: 2rem;
    }
    
    .challenge-text h2 {
        font-size: 1.5rem;
    }
    
    .challenge-text h3 {
        font-size: 1.2rem;
    }
    
    .features-showcase {
        grid-template-columns: 1fr;
    }
}