:root {
    --bg-color: #f8f9fa;
    --text-main: #2d3436;
    --text-muted: #555555;
    --accent-blue: #0984e3;
    --accent-orange: #e17055;
    --accent-green: #00b894;
    --accent-purple: #6c5ce7;
    --card-bg: #ffffff;
    --border-color: #dfe6e9;
}

[data-theme="dark"] {
    --bg-color: #1e272e;
    --text-main: #f1f2f6;
    --text-muted: #ced6e0;
    --card-bg: #2f3542;
    --border-color: #57606f;
    --accent-blue: #74b9ff;
}

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

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

/* Accessibility Focus Outlines */
a:focus-visible, button:focus-visible, input:focus-visible {
    outline: 3px solid var(--accent-blue);
    outline-offset: 2px;
}

/* Skip Link */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--accent-blue);
    color: white;
    padding: 8px;
    z-index: 100;
    transition: top 0.2s;
    text-decoration: none;
    font-weight: bold;
}
.skip-link:focus {
    top: 0;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.library-header {
    background-color: var(--card-bg);
    padding: 3rem 2rem;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 3rem;
    position: relative;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 2rem;
}

.header-text {
    flex: 1;
    min-width: 300px;
}

.library-header h1 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
}

.library-header p {
    color: var(--text-muted);
    font-size: 1.1rem;
    max-width: 600px;
}

.header-controls {
    display: flex;
    gap: 1rem;
    align-items: center;
    flex-wrap: wrap;
}

.search-bar {
    padding: 0.8rem 1.2rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background: var(--bg-color);
    color: var(--text-main);
    font-size: 1rem;
    font-family: 'Outfit', sans-serif;
    width: 300px;
}

.search-bar:focus {
    outline: 2px solid var(--accent-blue);
}

.theme-toggle-btn {
    position: absolute;
    top: 1.5rem;
    right: 2rem;
    background: transparent;
    color: var(--text-muted);
    border: none;
    font-size: 0.9rem;
    font-weight: 600;
    font-family: 'Outfit', sans-serif;
    cursor: pointer;
    transition: color 0.2s;
}

.theme-toggle-btn:hover {
    color: var(--text-main);
}

.category-filters {
    display: flex;
    gap: 0.75rem;
    overflow-x: auto;
    padding: 0 2rem 2rem 2rem;
    scrollbar-width: none; /* Firefox */
}
.category-filters::-webkit-scrollbar {
    display: none; /* Safari and Chrome */
}

.filter-btn {
    background: var(--card-bg);
    color: var(--text-muted);
    border: 1px solid var(--border-color);
    padding: 0.5rem 1.2rem;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 600;
    font-family: 'Outfit', sans-serif;
    cursor: pointer;
    white-space: nowrap;
    transition: all 0.2s ease;
}

.filter-btn:hover {
    color: var(--text-main);
    border-color: var(--text-muted);
}

.filter-btn.active {
    background: var(--text-main);
    color: var(--bg-color);
    border-color: var(--text-main);
}

.book-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
    padding-bottom: 4rem;
}

/* Author Section */
.author-section {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 3rem;
    margin-bottom: 4rem;
    display: flex;
    gap: 3rem;
    align-items: center;
    box-shadow: 0 4px 6px rgba(0,0,0,0.02);
}

.author-photo {
    flex-shrink: 0;
}

.photo-placeholder {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-blue) 0%, var(--accent-purple) 100%);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    font-weight: 800;
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

.author-content h2 {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 1rem;
    color: var(--text-main);
}

.author-content p {
    font-size: 1.1rem;
    color: var(--text-muted);
    margin-bottom: 2rem;
    line-height: 1.8;
}

.author-links {
    display: flex;
    gap: 1rem;
}

.author-btn {
    text-decoration: none;
    color: var(--text-main);
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    padding: 0.6rem 1.2rem;
    border-radius: 8px;
    font-weight: 600;
    transition: all 0.2s;
}

.author-btn:hover {
    background: var(--accent-blue);
    color: white;
    border-color: var(--accent-blue);
}

.nav-link {
    text-decoration: none;
    color: var(--text-muted);
    font-weight: 600;
    transition: color 0.2s;
}

.nav-link:hover {
    color: var(--accent-blue);
}

.book-card {
    background: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
    text-decoration: none;
    color: inherit;
    border: 1px solid var(--border-color);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    display: flex;
    flex-direction: column;
}

.book-card.published:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.05);
}

.book-card.coming-soon {
    opacity: 0.65;
    cursor: default;
    filter: grayscale(60%);
}

.book-cover {
    height: 160px;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    position: relative;
    background: var(--cover-bg, #2d3436);
    color: #ffffff;
    border-bottom: 1px solid var(--border-color);
}

.book-cover h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: #ffffff;
    margin: 0;
    z-index: 1;
}



.book-tag {
    position: absolute;
    top: 1rem;
    left: 1.5rem;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    background: rgba(0,0,0,0.5);
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
    color: #ffffff;
}

.book-info {
    padding: 1.5rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.book-info p {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

.book-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.status {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--accent-blue);
}

.progress-badge {
    background: var(--accent-green);
    color: white;
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.2rem 0.6rem;
    border-radius: 12px;
    text-transform: uppercase;
}

.status.locked {
    color: var(--text-muted);
    font-weight: 700;
}

footer {
    text-align: center;
    padding: 2rem;
    color: var(--text-muted);
    font-size: 0.9rem;
    border-top: 1px solid var(--border-color);
}