/* HackerShelf Styles */

:root {
    --hn-orange: #FF6600;
    --hn-orange-dark: #E85D00;
    --bg: #ffffff;
    --bg-secondary: #f6f6f0;
    --text: #000000;
    --text-secondary: #828282;
    --border: #e0e0e0;
    --shadow: rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] {
    --bg: #1a1a1a;
    --bg-secondary: #2a2a2a;
    --text: #e0e0e0;
    --text-secondary: #a0a0a0;
    --border: #404040;
    --shadow: rgba(0, 0, 0, 0.4);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica', 'Arial', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    transition: background 0.3s, color 0.3s;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Navigation */
.nav {
    background: var(--bg);
    border-bottom: 2px solid var(--hn-orange);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.nav-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 20px;
    font-weight: bold;
    color: var(--hn-orange);
    text-decoration: none;
}

.logo-icon {
    font-size: 24px;
}

.nav-links {
    display: flex;
    gap: 24px;
}

.nav-link {
    color: var(--text);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

.nav-link:hover {
    color: var(--hn-orange);
}

.nav-link.active {
    color: var(--hn-orange);
}

.theme-toggle {
    background: none;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 8px 12px;
    cursor: pointer;
    font-size: 18px;
    transition: all 0.2s;
}

.theme-toggle:hover {
    border-color: var(--hn-orange);
}

/* Main content */
.main {
    min-height: calc(100vh - 200px);
    padding: 40px 0;
}

.loading {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
    font-size: 18px;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 60px 20px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 40px;
}

.hero-title {
    font-size: 48px;
    margin-bottom: 16px;
    color: var(--hn-orange);
}

.hero-subtitle {
    font-size: 20px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 32px;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 40px;
    flex-wrap: wrap;
}

.stat {
    text-align: center;
}

.stat-number {
    font-size: 32px;
    font-weight: bold;
    color: var(--hn-orange);
    display: block;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 14px;
}

/* Search */
.search-box {
    margin-bottom: 32px;
}

.search-input {
    width: 100%;
    padding: 16px;
    font-size: 16px;
    border: 2px solid var(--border);
    border-radius: 8px;
    background: var(--bg);
    color: var(--text);
    transition: all 0.2s;
}

.search-input:focus {
    outline: none;
    border-color: var(--hn-orange);
}

/* Filters */
.filters {
    display: flex;
    gap: 16px;
    margin-bottom: 32px;
    flex-wrap: wrap;
    align-items: center;
}

.filter-group {
    display: flex;
    gap: 8px;
    align-items: center;
}

.filter-label {
    font-weight: 500;
    color: var(--text-secondary);
}

.filter-chip {
    padding: 8px 16px;
    border: 1px solid var(--border);
    border-radius: 20px;
    background: var(--bg);
    color: var(--text);
    cursor: pointer;
    transition: all 0.2s;
    font-size: 14px;
}

.filter-chip:hover {
    border-color: var(--hn-orange);
}

.filter-chip.active {
    background: var(--hn-orange);
    color: white;
    border-color: var(--hn-orange);
}

/* Book Grid */
.books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 24px;
    margin-bottom: 40px;
}

.book-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    color: var(--text);
    display: flex;
    flex-direction: column;
}

.book-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 16px var(--shadow);
    border-color: var(--hn-orange);
}

.book-cover {
    width: 100%;
    aspect-ratio: 2/3;
    object-fit: cover;
    background: linear-gradient(135deg, var(--hn-orange) 0%, var(--hn-orange-dark) 100%);
}

.book-cover-placeholder {
    width: 100%;
    aspect-ratio: 2/3;
    background: linear-gradient(135deg, var(--hn-orange) 0%, var(--hn-orange-dark) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    padding: 20px;
    text-align: center;
    color: white;
}

.cover-title {
    font-size: 16px;
    font-weight: bold;
    margin-bottom: 8px;
}

.cover-author {
    font-size: 12px;
    opacity: 0.9;
}

.book-info {
    padding: 16px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.book-title {
    font-size: 16px;
    font-weight: bold;
    margin-bottom: 4px;
    line-height: 1.3;
}

.book-author {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.book-meta {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-top: auto;
}

.book-badge {
    font-size: 11px;
    padding: 4px 8px;
    border-radius: 4px;
    background: var(--border);
    color: var(--text-secondary);
}

.book-badge.score {
    background: var(--hn-orange);
    color: white;
    font-weight: 500;
}

/* Book Detail Page */
.book-detail {
    max-width: 900px;
    margin: 0 auto;
}

.book-header {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 32px;
    margin-bottom: 40px;
}

.book-cover-large {
    width: 200px;
    aspect-ratio: 2/3;
    object-fit: cover;
    border-radius: 12px;
    box-shadow: 0 4px 12px var(--shadow);
}

.book-header-info h1 {
    font-size: 32px;
    margin-bottom: 8px;
}

.book-header-info .author {
    font-size: 20px;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.book-actions {
    display: flex;
    gap: 12px;
    margin: 20px 0;
}

.btn {
    padding: 12px 24px;
    border: 2px solid var(--hn-orange);
    border-radius: 8px;
    background: var(--hn-orange);
    color: white;
    cursor: pointer;
    font-size: 16px;
    font-weight: 500;
    transition: all 0.2s;
    text-decoration: none;
    display: inline-block;
}

.btn:hover {
    background: var(--hn-orange-dark);
    border-color: var(--hn-orange-dark);
}

.btn-secondary {
    background: transparent;
    color: var(--hn-orange);
}

.btn-secondary:hover {
    background: var(--hn-orange);
    color: white;
}

.book-section {
    margin-bottom: 40px;
}

.book-section h2 {
    font-size: 24px;
    margin-bottom: 16px;
    color: var(--hn-orange);
}

.book-section p {
    font-size: 16px;
    line-height: 1.8;
    margin-bottom: 12px;
}

.book-categories {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin: 16px 0;
}

.category-tag {
    padding: 6px 12px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 14px;
    color: var(--text);
}

/* Mentions */
.mentions-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.mention-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px;
}

.mention-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 12px;
}

.mention-user {
    font-weight: 500;
    color: var(--hn-orange);
    text-decoration: none;
}

.mention-date {
    font-size: 14px;
    color: var(--text-secondary);
}

.stance-badge {
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
}

.stance-strong_rec {
    background: #ff4444;
    color: white;
}

.stance-rec {
    background: var(--hn-orange);
    color: white;
}

.mention-quote {
    font-style: italic;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.mention-why {
    margin-bottom: 12px;
}

.mention-link {
    font-size: 14px;
    color: var(--hn-orange);
    text-decoration: none;
}

.mention-link:hover {
    text-decoration: underline;
}

/* About Page */
.about-content {
    max-width: 700px;
    margin: 0 auto;
    font-size: 16px;
    line-height: 1.8;
}

.about-content h2 {
    color: var(--hn-orange);
    margin: 32px 0 16px;
}

.about-content a {
    color: var(--hn-orange);
}

.about-content a.btn {
    color: white;
}

.about-content a.btn:hover {
    color: white;
}

/* Footer */
.footer {
    border-top: 1px solid var(--border);
    padding: 32px 0;
    text-align: center;
    color: var(--text-secondary);
    font-size: 14px;
}

.footer a {
    color: var(--hn-orange);
    text-decoration: none;
}

.footer a:hover {
    text-decoration: underline;
}

.footer p {
    margin: 8px 0;
}

/* Empty state */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
}

.empty-state-icon {
    font-size: 64px;
    margin-bottom: 16px;
}

/* Responsive */
@media (max-width: 768px) {
    .hero-title {
        font-size: 32px;
    }

    .nav-links {
        gap: 16px;
    }

    .books-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: 16px;
    }

    .book-header {
        grid-template-columns: 1fr;
    }

    .book-cover-large {
        width: 150px;
        margin: 0 auto;
    }

    .filters {
        font-size: 14px;
    }

    .hero-stats {
        gap: 24px;
    }
}