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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    background-color: var(--color-surface);
    color: var(--color-text);
    line-height: 1.5;
    font-size: var(--font-size-md);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

.section {
    padding: var(--spacing-3xl) 0;
}

.section-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: var(--spacing-xl);
    text-align: center;
    line-height: 1.2;
}

.subsection-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-lg);
}

.card {
    background: var(--color-surface-elevated);
    border-radius: var(--border-radius-xl);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-normal);
    border: 1px solid var(--color-input-border);
    transition: var(--transition-normal);
}

.card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.card-compact {
    padding: var(--spacing-lg);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 12px 20px;
    border-radius: var(--border-radius-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    text-decoration: none;
    border: 1px solid transparent;
    cursor: pointer;
    transition: var(--transition-normal);
    min-height: 44px;
}

.btn-primary {
    background-color: var(--color-button-bg);
    color: var(--color-button-text);
    border-color: var(--color-button-bg);
}

.btn-primary:hover {
    background-color: var(--color-button-hover-bg);
    border-color: var(--color-button-hover-bg);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: var(--color-button-secondary-bg);
    color: var(--color-button-secondary-text);
    border-color: var(--color-button-secondary-border);
}

.btn-secondary:hover {
    background-color: var(--color-primary);
    color: var(--color-focus);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-sm {
    padding: 8px 16px;
    font-size: var(--font-size-xs);
    min-height: 36px;
}

.btn-lg {
    padding: 16px 32px;
    font-size: var(--font-size-lg);
    min-height: 52px;
}

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

.form-label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

.form-input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--color-input-border);
    border-radius: var(--border-radius-sm);
    font-size: var(--font-size-md);
    color: var(--color-text);
    background-color: var(--color-input-bg);
    transition: var(--transition-normal);
}

.form-input:focus {
    border-color: var(--color-input-focus-border);
    outline: none;
    box-shadow: 0 0 0 3px rgba(54, 83, 20, 0.1);
}

.form-input::placeholder {
    color: var(--color-text-muted);
}

.form-select {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--color-input-border);
    border-radius: var(--border-radius-sm);
    font-size: var(--font-size-md);
    color: var(--color-text);
    background-color: var(--color-input-bg);
    cursor: pointer;
    transition: var(--transition-normal);
}

.form-select:focus {
    border-color: var(--color-input-focus-border);
    outline: none;
    box-shadow: 0 0 0 3px rgba(54, 83, 20, 0.1);
}

.grid {
    display: grid;
    gap: var(--spacing-lg);
}

.grid-cols-1 { grid-template-columns: repeat(1, 1fr); }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }

.flex {
    display: flex;
}

.flex-col {
    flex-direction: column;
}

.items-center {
    align-items: center;
}

.justify-center {
    justify-content: center;
}

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

.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }

.nav-tabs {
    display: flex;
    border-bottom: 2px solid var(--color-input-border);
    margin-bottom: var(--spacing-xl);
    gap: var(--spacing-xs);
}

.nav-link {
    padding: var(--spacing-md) var(--spacing-xl);
    color: var(--color-text-light);
    font-weight: 500;
    border: 1px solid transparent;
    border-radius: var(--border-radius-sm) var(--border-radius-sm) 0 0;
    transition: var(--transition-normal);
    cursor: pointer;
    position: relative;
}

.nav-link:hover {
    background-color: var(--color-hover);
    color: var(--color-primary);
}

.nav-link.active {
    background-color: var(--color-primary);
    color: var(--color-focus);
    border-color: var(--color-primary);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background-color: var(--color-primary);
}

.tab-content {
    background-color: var(--color-card-bg);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-normal);
    min-height: 120px;
}

.tab-pane {
    animation: fadeIn 0.3s ease-in-out;
}

@keyframes fadeIn {
    from { 
        opacity: 0; 
        transform: translateY(10px); 
    }
    to { 
        opacity: 1; 
        transform: translateY(0); 
    }
}

.accordion {
    border-radius: var(--border-radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-normal);
}

.accordion-item {
    border: 1px solid var(--color-input-border);
    border-bottom: none;
}

.accordion-item:last-child {
    border-bottom: 1px solid var(--color-input-border);
}

.accordion-button {
    width: 100%;
    padding: var(--spacing-lg) var(--spacing-xl);
    font-weight: 600;
    color: var(--color-text);
    background-color: var(--color-card-bg);
    border: none;
    text-align: left;
    cursor: pointer;
    transition: var(--transition-normal);
    position: relative;
}

.accordion-button:hover {
    background-color: var(--color-hover);
    color: var(--color-primary);
}

.accordion-button:not(.collapsed) {
    background-color: var(--color-primary);
    color: var(--color-focus);
}

.accordion-button::after {
    content: '▼';
    position: absolute;
    right: var(--spacing-xl);
    transition: transform 0.3s ease;
    font-size: var(--font-size-sm);
}

.accordion-button:not(.collapsed)::after {
    transform: rotate(-180deg);
}

.accordion-body {
    padding: var(--spacing-xl);
    background-color: var(--color-background);
    color: var(--color-text-light);
    line-height: 1.6;
    border-top: 1px solid var(--color-input-border);
}

.status-indicator {
    display: inline-block;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    margin-right: var(--spacing-sm);
}

.status-active {
    background-color: var(--color-success);
}

.status-inactive {
    background-color: var(--color-text-light);
}

.search-section {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-background);
}

.search-form {
    background-color: var(--color-surface-elevated);
    border-radius: var(--border-radius-xl);
    padding: var(--spacing-2xl);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    box-shadow: var(--shadow-normal);
    margin-top: var(--spacing-xl);
}

.form-actions {
    grid-column: 1 / -1;
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.search-results {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-surface);
}

.results-header {
    margin-bottom: var(--spacing-2xl);
}

.results-title {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-lg);
}

.results-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
}

.results-count {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
}

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

.results-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-3xl);
}

.book-card {
    display: flex;
    background-color: var(--color-surface-elevated);
    border-radius: var(--border-radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-normal);
    transition: var(--transition-normal);
    border: 1px solid var(--color-input-border);
}

.book-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.book-image {
    position: relative;
    width: 140px;
    min-width: 140px;
    height: 200px;
    background-color: var(--color-card-bg);
    overflow: hidden;
}

.book-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.favorite-btn {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    width: 32px;
    height: 32px;
    background-color: var(--color-surface-elevated);
    border: 1px solid var(--color-input-border);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition-normal);
    backdrop-filter: blur(4px);
}

.favorite-btn:hover {
    background-color: var(--color-error);
    color: var(--color-focus);
    transform: scale(1.1);
    border-color: var(--color-error);
}

.book-info {
    flex: 1;
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
}

.book-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    line-height: 1.3;
}

.book-title a {
    color: var(--color-text);
    text-decoration: none;
    transition: var(--transition-normal);
}

.book-title a:hover {
    color: var(--color-primary);
}

.book-author {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
}

.book-rating {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.stars {
    display: flex;
    color: #fbbf24;
}

.rating-count {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}

.book-meta {
    font-size: var(--font-size-xs);
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
    line-height: 1.4;
}

.book-price {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    margin-top: auto;
}

.current-price {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-primary);
}

.original-price {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    text-decoration: line-through;
}

.book-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.view-button {
    flex: 1;
}

.add-cart-button {
    width: 44px;
    height: 44px;
    background-color: var(--color-surface-elevated);
    border: 1px solid var(--color-primary);
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary);
    cursor: pointer;
    transition: var(--transition-normal);
}

.add-cart-button:hover {
    background-color: var(--color-primary);
    color: var(--color-focus);
}

@media screen and (max-width: 1024px) {
    .container {
        padding: 0 var(--spacing-lg);
    }
    
    .grid-cols-4 {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .results-container {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    }
}

@media screen and (max-width: 768px) {
    .section {
        padding: var(--spacing-2xl) 0;
    }
    
    .section-title {
        font-size: var(--font-size-2xl);
        margin-bottom: var(--spacing-lg);
    }
    
    .search-form {
        grid-template-columns: 1fr;
        padding: var(--spacing-xl);
    }
    
    .form-actions {
        justify-content: center;
    }
    
    .results-info {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .nav-tabs {
        flex-wrap: wrap;
    }
    
    .nav-link {
        flex: 1;
        text-align: center;
        min-width: 120px;
    }
    
    .grid-cols-3,
    .grid-cols-2 {
        grid-template-columns: 1fr;
    }
    
    .results-container {
        grid-template-columns: 1fr;
    }
}

@media screen and (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .card {
        padding: var(--spacing-lg);
    }
    
    .search-form {
        padding: var(--spacing-lg);
    }
    
    .book-card {
        flex-direction: column;
    }
    
    .book-image {
        width: 100%;
        min-width: unset;
        height: 240px;
    }
    
    .btn {
        padding: 12px 16px;
        width: 100%;
    }
    
    .form-actions {
        flex-direction: column;
    }
}