/* ============================================
   ExcavatorPartsPro - Main Stylesheet
   Desktop-focused (1200px container)
   ============================================ */

/* CSS Variables */
:root {
    --color-primary: #1a365d;
    --color-accent: #dd6b20;
    --color-bg: #f7fafc;
    --color-card: #ffffff;
    --color-border: #e2e8f0;
    --color-text: #2d3748;
    --color-text-light: #4a5568;

    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;

    --container-width: 1200px;
    --header-height: 64px;
    --border-radius: 4px;
    --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    color: var(--color-text);
    background-color: var(--color-bg);
    line-height: 1.5;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--space-xl);
}

/* Header */
.site-header {
    background-color: var(--color-card);
    border-bottom: 1px solid var(--color-border);
    height: var(--header-height);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
}

.logo {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-primary);
    text-decoration: none;
}

.logo-img {
    height: 48px;
    width: auto;
    object-fit: contain;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--space-xl);
}

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

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--color-accent);
}

/* Search Section */
.search-section {
    background-color: var(--color-card);
    padding: var(--space-lg) 0;
    border-bottom: 1px solid var(--color-border);
}

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

.search-container i {
    position: absolute;
    left: var(--space-md);
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-light);
}

.search-input {
    width: 100%;
    height: 48px;
    padding: 0 var(--space-xl) 0 3rem;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    font-size: 1rem;
    outline: none;
    transition: border-color 0.2s;
}

.search-input:focus {
    border-color: var(--color-accent);
}

.search-clear {
    position: absolute;
    right: var(--space-md);
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--color-text-light);
    cursor: pointer;
    padding: var(--space-sm);
}

.search-results-info {
    text-align: center;
    margin-top: var(--space-md);
    color: var(--color-text-light);
    font-size: 0.875rem;
}

/* Pagination */
.pagination-section {
    background-color: var(--color-card);
    padding: var(--space-lg) 0;
    border-bottom: 1px solid var(--color-border);
}

.pagination-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.pagination-info {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-left: var(--space-xl);
    color: var(--color-text-light);
    font-size: 0.875rem;
}

.pagination-btn {
    min-width: 40px;
    height: 40px;
    padding: 0 var(--space-md);
    background-color: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    color: var(--color-text);
    cursor: pointer;
    font-weight: 600;
    font-size: 0.875rem;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.pagination-btn:hover:not(.disabled):not(.active) {
    background-color: var(--color-bg);
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.pagination-btn.active {
    background-color: var(--color-accent);
    color: white;
    border-color: var(--color-accent);
    cursor: default;
}

.pagination-btn.disabled {
    color: #a0aec0;
    cursor: not-allowed;
    opacity: 0.5;
}

.pagination-dots {
    color: var(--color-text-light);
    padding: 0 var(--space-sm);
}

/* Products Grid */
.products-section {
    padding: var(--space-xl) 0;
    min-height: 600px;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-xl);
    margin-bottom: var(--space-xl);
}

/* Product Card */
.product-card {
    background: var(--color-card);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--box-shadow);
    transition: transform 0.2s, box-shadow 0.2s;
    display: flex;
    flex-direction: column;
    height: 420px;
}

.product-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}

.product-image {
    width: 100%;
    height: 260px;
    background-color: var(--color-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

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

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

.product-name {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--space-sm);
    line-height: 1.3;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.product-name a {
    color: inherit;
    text-decoration: none;
}

.product-name a:hover {
    color: var(--color-accent);
}

.product-meta {
    font-size: 0.875rem;
    color: var(--color-text-light);
    margin-bottom: var(--space-sm);
}

.product-brand {
    font-size: 0.875rem;
    color: var(--color-text-light);
    margin-bottom: var(--space-xs);
}

/* Price Container - 价格标注位置 */
.price-container {
    margin: var(--space-md) 0;
    display: flex;
    align-items: baseline;
    gap: var(--space-sm);
}

.price-label {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-accent);
}

.price-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-accent);
    /* 价格值留空，仅占位 */
}

/* Loading & Empty States */
.loading-state,
.error-state {
    text-align: center;
    padding: var(--space-xl);
    color: var(--color-text);
}

.error-state i {
    font-size: 3rem;
    color: var(--color-accent);
    margin-bottom: var(--space-md);
}

.error-state h3 {
    font-size: 1.5rem;
    margin-bottom: var(--space-sm);
    color: var(--color-text);
}

.error-state p {
    color: var(--color-text-light);
    margin-bottom: var(--space-sm);
}

.empty-state {
    text-align: center;
    padding: var(--space-xl);
    color: var(--color-text-light);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--color-border);
    border-top-color: var(--color-accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--space-md);
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.empty-state i {
    font-size: 3rem;
    color: var(--color-border);
    margin-bottom: var(--space-md);
}

/* Product Detail Page */
.breadcrumb-section {
    background-color: var(--color-bg);
    padding: var(--space-md) 0;
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.875rem;
}

.breadcrumb a {
    color: var(--color-text);
    text-decoration: none;
}

.breadcrumb a:hover {
    color: var(--color-accent);
}

.breadcrumb .separator {
    color: var(--color-text-light);
}

.product-detail-section {
    padding: var(--space-xl) 0;
}

.product-detail-grid {
    display: grid;
    grid-template-columns: 600px 560px;
    gap: var(--space-xl);
    margin-bottom: var(--space-xl);
}

.product-images {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.main-image {
    width: 580px;
    height: 400px;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    overflow: hidden;
    background-color: var(--color-bg);
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.thumbnail-images {
    display: flex;
    gap: var(--space-sm);
    height: 100px;
}

.thumbnail {
    width: 100px;
    height: 100px;
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius);
    cursor: pointer;
    overflow: hidden;
    transition: border-color 0.2s;
}

.thumbnail:hover,
.thumbnail.active {
    border-color: var(--color-accent);
}

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

.product-info-detail {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.product-header h1 {
    font-size: 1.75rem;
    color: var(--color-primary);
    margin-bottom: var(--space-md);
}

.product-meta-detail {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    padding: var(--space-lg);
    background-color: var(--color-bg);
    border-radius: var(--border-radius);
    font-size: 0.875rem;
}

/* Detail Price - 详情页价格标注位置 */
.detail-price {
    margin: var(--space-lg) 0;
    padding: var(--space-md);
    background-color: var(--color-bg);
    border-radius: var(--border-radius);
    display: flex;
    align-items: baseline;
    gap: var(--space-sm);
}

.detail-price .price-label {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-accent);
}

.detail-price .price-placeholder {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-accent);
    /* 价格占位符，留空 */
}

.tabs {
    display: flex;
    gap: var(--space-sm);
    border-bottom: 2px solid var(--color-border);
    margin-bottom: var(--space-lg);
}

.tab-btn {
    padding: var(--space-md) var(--space-lg);
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    cursor: pointer;
    font-weight: 600;
    color: var(--color-text-light);
    transition: color 0.2s;
}

.tab-btn.active {
    color: var(--color-accent);
    border-bottom-color: var(--color-accent);
}

.tab-content {
    min-height: 300px;
    padding: var(--space-lg) 0;
}

.spec-table {
    width: 100%;
    border-collapse: collapse;
}

.spec-table td {
    padding: var(--space-md);
    border-bottom: 1px solid var(--color-border);
}

.spec-table td:first-child {
    font-weight: 600;
    width: 40%;
    color: var(--color-primary);
}

.compatibility-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.compatibility-list li {
    padding: var(--space-sm);
    background-color: var(--color-bg);
    border-radius: var(--border-radius);
}

.action-buttons {
    display: flex;
    gap: var(--space-md);
    margin-top: var(--space-xl);
}

.btn-primary {
    padding: var(--space-md) var(--space-lg);
    background-color: var(--color-accent);
    color: white;
    text-decoration: none;
    border-radius: var(--border-radius);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    transition: background-color 0.2s;
}

.btn-primary:hover {
    background-color: #c05621;
}

.btn-secondary {
    padding: var(--space-md) var(--space-lg);
    background-color: transparent;
    color: var(--color-text);
    text-decoration: none;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    transition: border-color 0.2s;
}

.btn-secondary:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

/* Related Products */
.related-products-section {
    padding: var(--space-xl) 0;
    background-color: var(--color-bg);
}

.related-grid {
    grid-template-columns: repeat(6, 1fr);
}

.related-grid .product-card {
    height: 380px;
}

.related-grid .product-image {
    height: 220px;
}

/* Footer */
.site-footer {
    background-color: var(--color-primary);
    color: white;
    padding: var(--space-xl) 0;
    margin-top: var(--space-xl);
    text-align: center;
}

.site-footer p {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.875rem;
}

/* Hero / Professional intro section */
.hero-section {
    background: linear-gradient(135deg, #1a365d 0%, #2b6cb0 40%, #f6ad55 100%);
    color: #ffffff;
    padding: calc(var(--space-xl) + 16px) 0 var(--space-xl);
}

.hero-layout {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: var(--space-xl);
    align-items: stretch;
}

.hero-copy {
    max-width: 640px;
}

.hero-kicker {
    font-size: 0.9rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    opacity: 0.85;
    margin-bottom: var(--space-sm);
}

.hero-main-title {
    font-size: 2rem;
    line-height: 1.25;
    font-weight: 800;
    margin-bottom: var(--space-sm);
}

.hero-subtitle {
    font-size: 0.9rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    opacity: 0.9;
    margin-bottom: var(--space-md);
}

.hero-label {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background-color: rgba(0, 0, 0, 0.35);
    border-radius: 999px;
    font-size: 0.8rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    margin-bottom: var(--space-md);
}

.hero-description {
    font-size: 0.95rem;
    max-width: 36rem;
    opacity: 0.9;
}

.hero-divider {
    margin: var(--space-lg) 0 var(--space-md);
    border: 0;
    height: 1px;
    background: linear-gradient(to right, rgba(255, 255, 255, 0.6), transparent);
}

.hero-bottom {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.hero-secondary-title {
    font-size: 1.1rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
}

.hero-secondary-text {
    font-size: 0.9rem;
    opacity: 0.9;
}

.hero-contact-link {
    font-size: 0.9rem;
    font-weight: 600;
    color: #fefcbf;
    text-decoration: none;
}

.hero-contact-link:hover {
    text-decoration: underline;
}

.hero-visual {
    position: relative;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.25);
}

/* Hero carousel (right side of hero section) */
.hero-carousel {
    position: relative;
    width: 100%;
    height: 100%;
    min-height: 260px;
    background-image:
        linear-gradient(to top, rgba(26, 32, 44, 0.25), rgba(0, 0, 0, 0.25)),
        linear-gradient(to top, #c05621 40%, #1a365d 100%);
}

.hero-slide {
    position: absolute;
    inset: 0;
    opacity: 0;
    transition: opacity 0.6s ease;
}

.hero-slide img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    background-color: rgba(0, 0, 0, 0.4);
}

.hero-slide.active {
    opacity: 1;
}

.hero-carousel-control {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: none;
    background-color: rgba(0, 0, 0, 0.4);
    color: #fff;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
}

.hero-carousel-control.prev {
    left: 10px;
}

.hero-carousel-control.next {
    right: 10px;
}

.hero-carousel-dots {
    position: absolute;
    bottom: 12px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 8px;
}

.hero-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    border: none;
    background-color: rgba(255, 255, 255, 0.5);
    cursor: pointer;
}

.hero-dot.active {
    background-color: #fff;
}

/* Home page - featured products section */
.home-products-section {
    padding: var(--space-xl) 0;
}

.page-title {
    font-size: 1.75rem;
    color: var(--color-primary);
    margin-bottom: var(--space-sm);
}

.page-subtitle {
    font-size: 0.95rem;
    color: var(--color-text-light);
    margin-bottom: var(--space-xl);
}

.home-products-wrapper {
    position: relative;
    min-height: 260px;
}

#home-loading-state {
    position: absolute;
    inset: 0;
}

.home-all-products {
    margin-top: var(--space-lg);
    text-align: center;
}

.all-products-btn {
    font-size: 0.875rem;
    padding: var(--space-sm) var(--space-lg);
}

/* Generic page sections (About / Contact) */
.page-section {
    padding: var(--space-xl) 0;
}

.section-title {
    font-size: 1.25rem;
    margin-bottom: var(--space-md);
    color: var(--color-primary);
}

/* About page */
.about-intro {
    max-width: 720px;
    margin-bottom: var(--space-xl);
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
    margin-bottom: var(--space-xl);
}

.about-card {
    background-color: var(--color-card);
    border-radius: var(--border-radius);
    padding: var(--space-lg);
    box-shadow: var(--box-shadow);
    font-size: 0.95rem;
    color: var(--color-text-light);
}

.about-secondary {
    border-top: 1px solid var(--color-border);
    padding-top: var(--space-xl);
}

.about-secondary-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
    margin-top: var(--space-lg);
}

.about-point h3 {
    font-size: 1rem;
    margin-bottom: var(--space-sm);
    color: var(--color-primary);
}

.about-point p {
    font-size: 0.95rem;
    color: var(--color-text-light);
}

/* Contact page */
.contact-grid {
    display: grid;
    grid-template-columns: 1.1fr 1.4fr;
    gap: var(--space-xl);
    margin-top: var(--space-xl);
}

.contact-card {
    background-color: var(--color-card);
    border-radius: var(--border-radius);
    padding: var(--space-xl);
    box-shadow: var(--box-shadow);
}

.contact-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    font-size: 0.95rem;
}

.contact-label {
    display: block;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 0.15rem;
}

.contact-value {
    color: var(--color-text-light);
}

.contact-value a {
    color: var(--color-accent);
    text-decoration: none;
}

.contact-value a:hover {
    text-decoration: underline;
}

.contact-form .form-row {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    margin-bottom: var(--space-md);
}

.contact-form label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-primary);
}

.contact-form input,
.contact-form textarea {
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: 0.5rem 0.75rem;
    font-size: 0.95rem;
    outline: none;
    transition: border-color 0.2s;
    font-family: inherit;
}

.contact-form input:focus,
.contact-form textarea:focus {
    border-color: var(--color-accent);
}

.contact-note {
    font-size: 0.8rem;
    color: var(--color-text-light);
    margin-bottom: var(--space-md);
}

.contact-form .btn-primary {
    width: 100%;
    justify-content: center;
}

/* Responsive tweaks for hero and about/contact */
@media (max-width: 960px) {
    .hero-layout {
        grid-template-columns: 1fr;
    }

    .hero-section {
        padding-top: var(--space-xl);
    }

    .about-grid,
    .about-secondary-grid {
        grid-template-columns: 1fr;
    }

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