/* ==========================================
   SecondShelf - Main Stylesheet
   ========================================== */

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f7fa;
}

/* Utility Classes */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

.hidden {
    display: none;
}

/* Header and Navigation */
.main-header {
    background-color: #4a90e2;
    color: white;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.main-nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 600;
}

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

.nav-links a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: opacity 0.3s ease;
}

.nav-links a:hover {
    opacity: 0.8;
}

.nav-links a.active {
    text-decoration: underline;
    text-decoration-thickness: 2px;
}

/* Main Content */
.main-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    min-height: calc(100vh - 200px);
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 3rem 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 10px;
    margin-bottom: 2rem;
}

.hero h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.2rem;
    opacity: 0.9;
}

/* Search Section */
.search-section {
    margin-bottom: 2rem;
}

.search-container {
    position: relative;
    max-width: 600px;
    margin: 0 auto;
}

.search-input {
    width: 100%;
    padding: 1rem 3rem 1rem 1rem;
    font-size: 1rem;
    border: 2px solid #ddd;
    border-radius: 8px;
    transition: border-color 0.3s ease;
}

.search-input:focus {
    outline: none;
    border-color: #4a90e2;
}

.search-icon {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.2rem;
}

.results-count {
    text-align: center;
    margin-top: 1rem;
    color: #666;
    font-size: 0.9rem;
}

/* Section Headings */
.section-heading {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: #333;
    text-align: center;
}

/* Book Listings */
.book-listings {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.book-card {
    background: white;
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.book-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.book-card.sold {
    opacity: 0.6;
    background-color: #f0f0f0;
}

.book-card.sold::after {
    content: 'SOLD';
    display: block;
    position: absolute;
    top: 1rem;
    right: 1rem;
    background-color: #e74c3c;
    color: white;
    padding: 0.3rem 0.8rem;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: bold;
}

.book-card h3 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    color: #2c3e50;
}

.book-card p {
    margin-bottom: 0.5rem;
    color: #666;
}

.book-card .book-meta {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
    margin-bottom: 1rem;
}

.book-card .book-meta strong {
    color: #333;
}

.book-card .book-contact {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid #eee;
    color: #4a90e2;
    font-weight: 500;
}

/* Card Action Buttons */
.card-actions {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
}

.btn {
    padding: 0.6rem 1.2rem;
    border: none;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

.btn-primary {
    background-color: #4a90e2;
    color: white;
}

.btn-primary:hover {
    background-color: #357abd;
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: #95a5a6;
    color: white;
}

.btn-secondary:hover {
    background-color: #7f8c8d;
}

.btn-danger {
    background-color: #e74c3c;
    color: white;
}

.btn-danger:hover {
    background-color: #c0392b;
}

.btn-favorite {
    background-color: #f39c12;
    color: white;
}

.btn-favorite:hover {
    background-color: #d68910;
}

/* No Listings Message */
.no-listings {
    text-align: center;
    padding: 3rem;
    background: white;
    border-radius: 8px;
    grid-column: 1 / -1;
}

.no-listings p {
    font-size: 1.1rem;
    color: #666;
    margin-bottom: 1rem;
}

/* Add Book Form */
.add-book-section {
    max-width: 600px;
    margin: 0 auto;
}

.book-form {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: #333;
}

.required {
    color: #e74c3c;
}

.form-input {
    width: 100%;
    padding: 0.8rem;
    font-size: 1rem;
    border: 2px solid #ddd;
    border-radius: 6px;
    transition: border-color 0.3s ease;
}

.form-input:focus {
    outline: none;
    border-color: #4a90e2;
}

.form-actions {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

.form-actions .btn {
    flex: 1;
}

/* Success Message */
.success-message {
    background: #d4edda;
    color: #155724;
    padding: 1.5rem;
    border-radius: 8px;
    margin-top: 1rem;
    text-align: center;
}

.success-message p {
    font-size: 1.1rem;
    margin-bottom: 1rem;
}

/* Footer */
.main-footer {
    background-color: #2c3e50;
    color: white;
    text-align: center;
    padding: 2rem;
    margin-top: 3rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .main-nav {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-links {
        gap: 1rem;
    }

    .main-content {
        padding: 1rem;
    }

    .hero h2 {
        font-size: 1.8rem;
    }

    .hero p {
        font-size: 1rem;
    }

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

    .form-actions {
        flex-direction: column;
    }

    .card-actions {
        flex-direction: column;
    }
}