/* ===========================
   YIYUANTONG - B2B Website
   Professional Auto Parts Export
   =========================== */

:root {
    --primary: #0a3d62;
    --primary-light: #1a5276;
    --primary-dark: #062c45;
    --accent: #ee6c4d;
    --accent-dark: #d54e2e;
    --accent-light: #f5a07a;
    --dark: #1a1a2e;
    --gray-900: #1e2a3a;
    --gray-700: #4a5568;
    --gray-500: #718096;
    --gray-300: #cbd5e0;
    --gray-100: #f7fafc;
    --gray-50: #f0f4f8;
    --white: #ffffff;
    --success: #27ae60;
    --warning: #f39c12;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 30px rgba(0,0,0,0.12);
    --radius: 8px;
    --radius-lg: 16px;
    --transition: all 0.3s ease;
    --max-width: 1280px;
    --font: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', -apple-system, sans-serif;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font);
    color: var(--gray-900);
    background: var(--white);
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

img {
    max-width: 100%;
    display: block;
}

ul {
    list-style: none;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ===========================
   Top Bar
   =========================== */
.top-bar {
    background: var(--primary-dark);
    color: rgba(255,255,255,0.85);
    font-size: 0.8rem;
    padding: 8px 0;
}

.top-bar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.top-bar-info {
    display: flex;
    gap: 24px;
}

.top-bar-info span {
    display: flex;
    align-items: center;
    gap: 6px;
}

.top-bar-info svg {
    width: 14px;
    height: 14px;
    fill: var(--accent);
}

.top-bar-links {
    display: flex;
    gap: 16px;
}

.top-bar-links a:hover {
    color: var(--accent);
}

/* ===========================
   Header / Navigation
   =========================== */
.header {
    background: var(--white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: var(--transition);
}

.header.scrolled {
    box-shadow: var(--shadow-md);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary);
    letter-spacing: -0.5px;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
}

.logo span {
    color: var(--accent);
}

.nav-menu {
    display: flex;
    gap: 32px;
    align-items: center;
}

.nav-menu a {
    font-weight: 600;
    color: var(--gray-700);
    font-size: 0.95rem;
    position: relative;
    padding: 4px 0;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: var(--transition);
}

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

.nav-menu a:hover::after,
.nav-menu a.active::after {
    width: 100%;
}

.nav-cta {
    background: var(--accent);
    color: white !important;
    padding: 10px 24px;
    border-radius: var(--radius);
    font-weight: 700;
    transition: var(--transition);
}

.nav-cta:hover {
    background: var(--accent-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(238,108,77,0.4);
}

.nav-cta::after {
    display: none;
}

.mobile-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.mobile-toggle span {
    display: block;
    width: 24px;
    height: 3px;
    background: var(--primary);
    margin: 5px 0;
    border-radius: 2px;
    transition: var(--transition);
}

/* ===========================
   Hero Section
   =========================== */
.hero {
    background: linear-gradient(135deg, rgba(6,44,69,0.92) 0%, rgba(10,61,98,0.88) 50%, rgba(26,82,118,0.85) 100%),
                url('images/hero-warehouse.png');
    background-size: cover;
    background-position: center;
    color: white;
    padding: 80px 0 100px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 60%;
    height: 100%;
    background: radial-gradient(circle at 70% 50%, rgba(238,108,77,0.15) 0%, transparent 60%);
}

.hero::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-text h1 {
    font-size: 3rem;
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 20px;
    letter-spacing: -1px;
}

.hero-text h1 span {
    color: var(--accent);
}

.hero-text p {
    font-size: 1.15rem;
    color: rgba(255,255,255,0.8);
    margin-bottom: 32px;
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: var(--radius);
    font-weight: 700;
    font-size: 1rem;
    cursor: pointer;
    border: none;
    transition: var(--transition);
}

.btn-primary {
    background: var(--accent);
    color: white;
}

.btn-primary:hover {
    background: var(--accent-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(238,108,77,0.4);
}

.btn-outline {
    background: transparent;
    color: white;
    border: 2px solid rgba(255,255,255,0.3);
}

.btn-outline:hover {
    background: rgba(255,255,255,0.1);
    border-color: white;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-top: 48px;
}

.hero-stat {
    text-align: left;
}

.hero-stat .number {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--accent);
    line-height: 1;
}

.hero-stat .label {
    font-size: 0.85rem;
    color: rgba(255,255,255,0.6);
    margin-top: 4px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.hero-visual {
    position: relative;
    height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-card {
    background: rgba(255,255,255,0.08);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: var(--radius-lg);
    padding: 32px;
    width: 100%;
}

.hero-card-title {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.hero-card-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.hero-card-item {
    background: rgba(255,255,255,0.06);
    border-radius: var(--radius);
    padding: 14px;
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.85rem;
    transition: var(--transition);
}

.hero-card-item:hover {
    background: rgba(238,108,77,0.15);
    transform: translateX(4px);
}

.hero-card-item .icon {
    width: 32px;
    height: 32px;
    background: var(--accent);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
    flex-shrink: 0;
}

/* ===========================
   Section Common
   =========================== */
.section {
    padding: 80px 0;
}

.section-gray {
    background: var(--gray-50);
}

.section-header {
    text-align: center;
    margin-bottom: 56px;
}

.section-tag {
    display: inline-block;
    background: rgba(238,108,77,0.1);
    color: var(--accent);
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    padding: 6px 16px;
    border-radius: 20px;
    margin-bottom: 16px;
}

.section-title {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--primary-dark);
    margin-bottom: 12px;
    letter-spacing: -0.5px;
}

.section-subtitle {
    font-size: 1.05rem;
    color: var(--gray-500);
    max-width: 600px;
    margin: 0 auto;
}

/* ===========================
   Categories Grid
   =========================== */
.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 24px;
}

.category-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: 28px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-50);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.category-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--accent);
    transform: scaleY(0);
    transition: var(--transition);
    transform-origin: bottom;
}

.category-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
    border-color: var(--gray-300);
}

.category-card:hover::before {
    transform: scaleY(1);
}

.category-icon {
    width: 56px;
    height: 56px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
}

.category-icon svg {
    width: 28px;
    height: 28px;
    fill: white;
}

.category-image {
    height: 160px;
    border-radius: 12px;
    overflow: hidden;
    margin-bottom: 16px;
    position: relative;
    background: var(--gray-50);
}

.category-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.category-card:hover .category-image img {
    transform: scale(1.08);
}

.category-icon-overlay {
    position: absolute;
    bottom: 12px;
    left: 12px;
    width: 40px;
    height: 40px;
    border-radius: 8px;
    background: rgba(10,61,98,0.85);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
}

.category-icon-overlay svg {
    width: 22px;
    height: 22px;
    fill: white;
}

.category-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 6px;
}

.category-card .cat-name-cn {
    font-size: 0.85rem;
    color: var(--gray-500);
    margin-bottom: 12px;
}

.category-card .cat-count {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--gray-50);
    color: var(--gray-700);
    font-size: 0.8rem;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: 20px;
}

.category-card .cat-count .grade-badge {
    display: inline-block;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--success);
}

.category-card .cat-link {
    margin-top: 16px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--accent);
}

.category-card .cat-link:hover {
    gap: 10px;
}

/* ===========================
   Features / Advantages
   =========================== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 32px;
}

.feature-item {
    text-align: center;
    padding: 24px;
}

.feature-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 20px;
    background: rgba(10,61,98,0.06);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.feature-item:hover .feature-icon {
    background: rgba(238,108,77,0.1);
    transform: scale(1.1);
}

.feature-icon svg {
    width: 30px;
    height: 30px;
    fill: var(--primary);
    transition: var(--transition);
}

.feature-item:hover .feature-icon svg {
    fill: var(--accent);
}

.feature-item h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--gray-900);
}

.feature-item p {
    font-size: 0.9rem;
    color: var(--gray-500);
    line-height: 1.6;
}

/* ===========================
   Products Section
   =========================== */
.products-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 32px;
    flex-wrap: wrap;
    gap: 16px;
}

.search-box {
    position: relative;
    flex: 1;
    max-width: 400px;
}

.search-box input {
    width: 100%;
    padding: 12px 16px 12px 44px;
    border: 2px solid var(--gray-100);
    border-radius: var(--radius);
    font-size: 0.95rem;
    transition: var(--transition);
    background: var(--gray-50);
}

.search-box input:focus {
    outline: none;
    border-color: var(--accent);
    background: white;
}

.search-box svg {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    width: 20px;
    height: 20px;
    fill: var(--gray-500);
}

.filter-tabs {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.filter-tab {
    padding: 8px 18px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    background: var(--gray-50);
    color: var(--gray-700);
    cursor: pointer;
    border: 2px solid transparent;
    transition: var(--transition);
    white-space: nowrap;
}

.filter-tab:hover {
    border-color: var(--gray-300);
}

.filter-tab.active {
    background: var(--primary);
    color: white;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

.product-card {
    background: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-50);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.product-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
    border-color: var(--gray-300);
}

.product-image {
    height: 200px;
    background: var(--gray-50);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.product-card:hover .product-image img {
    transform: scale(1.08);
}

.product-image .product-icon {
    font-size: 3.5rem;
    opacity: 0.3;
    transition: var(--transition);
}

.product-card:hover .product-image .product-icon {
    transform: scale(1.1);
    opacity: 0.4;
}

.product-grade {
    position: absolute;
    top: 12px;
    right: 12px;
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 700;
    color: white;
}

.product-grade.a {
    background: var(--success);
}

.product-grade.b {
    background: var(--warning);
}

.product-category-tag {
    position: absolute;
    top: 12px;
    left: 12px;
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 0.7rem;
    font-weight: 600;
    background: rgba(10,61,98,0.85);
    color: white;
}

.product-info {
    padding: 20px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.product-info h3 {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 4px;
}

.product-name-cn {
    font-size: 0.85rem;
    color: var(--gray-500);
    margin-bottom: 12px;
}

.product-meta {
    display: flex;
    gap: 12px;
    margin-bottom: 12px;
    flex-wrap: wrap;
}

.product-meta-item {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 0.78rem;
    color: var(--gray-700);
}

.product-meta-item .dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
}

.product-meta-item .dot.high { background: var(--success); }
.product-meta-item .dot.medium { background: var(--warning); }
.product-meta-item .dot.low { background: var(--gray-500); }
.product-meta-item .dot.mid-high { background: var(--accent); }

.product-note {
    font-size: 0.82rem;
    color: var(--gray-500);
    line-height: 1.5;
    margin-bottom: 16px;
    flex: 1;
}

.product-actions {
    display: flex;
    gap: 8px;
}

.product-btn {
    flex: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px;
    text-align: center;
    border-radius: var(--radius);
    font-size: 0.82rem;
    font-weight: 700;
    cursor: pointer;
    border: 2px solid var(--gray-100);
    transition: var(--transition);
    text-decoration: none;
}

.product-btn.inquire {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
}

.product-btn.inquire:hover {
    background: var(--accent-dark);
}

.product-btn.detail {
    background: white;
    color: var(--primary);
    border-color: var(--gray-300);
}

.product-btn.detail:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.no-results {
    grid-column: 1 / -1;
    text-align: center;
    padding: 60px 20px;
    color: var(--gray-500);
}

.no-results .icon {
    font-size: 3rem;
    margin-bottom: 16px;
    opacity: 0.3;
}

/* ===========================
   About / Story Section
   =========================== */
.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-text h2 {
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary-dark);
    margin-bottom: 20px;
    line-height: 1.3;
}

.about-text p {
    color: var(--gray-700);
    margin-bottom: 16px;
    line-height: 1.8;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-top: 32px;
}

.about-stat {
    background: var(--gray-50);
    border-radius: var(--radius);
    padding: 20px;
    border-left: 3px solid var(--accent);
}

.about-stat .num {
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary);
}

.about-stat .desc {
    font-size: 0.85rem;
    color: var(--gray-500);
}

.about-visual {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    border-radius: var(--radius-lg);
    padding: 0;
    color: white;
    overflow: hidden;
    position: relative;
}

.about-factory-img {
    width: 100%;
    height: 280px;
    object-fit: cover;
}

.about-checklist-overlay {
    padding: 32px;
}

.about-visual h3 {
    font-size: 1.3rem;
    margin-bottom: 24px;
}

.about-checklist {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.about-checklist li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    font-size: 0.95rem;
    color: rgba(255,255,255,0.9);
}

.about-checklist .check {
    width: 24px;
    height: 24px;
    background: var(--accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 0.7rem;
    margin-top: 2px;
}

/* ===========================
   CTA Section
   =========================== */
.cta-section {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    color: white;
    padding: 64px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(238,108,77,0.15), transparent 70%);
    border-radius: 50%;
}

.cta-section h2 {
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 12px;
    position: relative;
}

.cta-section p {
    color: rgba(255,255,255,0.8);
    margin-bottom: 32px;
    font-size: 1.1rem;
    position: relative;
}

.cta-section .btn {
    position: relative;
}

/* ===========================
   Contact / Inquiry Form
   =========================== */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 48px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.contact-info-card {
    background: var(--gray-50);
    border-radius: var(--radius-lg);
    padding: 24px;
    display: flex;
    align-items: flex-start;
    gap: 16px;
}

.contact-info-card .icon {
    width: 44px;
    height: 44px;
    background: var(--primary);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact-info-card .icon svg {
    width: 22px;
    height: 22px;
    fill: white;
}

.contact-info-card h4 {
    font-size: 0.95rem;
    font-weight: 700;
    margin-bottom: 4px;
    color: var(--gray-900);
}

.contact-info-card p {
    font-size: 0.85rem;
    color: var(--gray-500);
}

.inquiry-form {
    background: white;
    border-radius: var(--radius-lg);
    padding: 40px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--gray-50);
}

.form-group {
    margin-bottom: 20px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 6px;
}

.form-group label .required {
    color: var(--accent);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--gray-100);
    border-radius: var(--radius);
    font-size: 0.95rem;
    font-family: var(--font);
    transition: var(--transition);
    background: var(--gray-50);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
    background: white;
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.form-submit {
    width: 100%;
    padding: 14px;
    font-size: 1rem;
}

.form-success {
    background: rgba(39,174,96,0.1);
    border: 2px solid var(--success);
    border-radius: var(--radius);
    padding: 16px;
    text-align: center;
    color: var(--success);
    font-weight: 600;
    margin-bottom: 20px;
    display: none;
}

.form-success.show {
    display: block;
}

/* ===========================
   Footer
   =========================== */
.footer {
    background: var(--dark);
    color: rgba(255,255,255,0.7);
    padding: 60px 0 0;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-brand .logo {
    color: white;
    margin-bottom: 16px;
}

.footer-brand p {
    font-size: 0.9rem;
    line-height: 1.7;
    margin-bottom: 20px;
}

.footer-social {
    display: flex;
    gap: 12px;
}

.footer-social a {
    width: 36px;
    height: 36px;
    background: rgba(255,255,255,0.08);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.footer-social a:hover {
    background: var(--accent);
}

.footer-social svg {
    width: 18px;
    height: 18px;
    fill: white;
}

.footer-col h4 {
    color: white;
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.footer-col ul li {
    margin-bottom: 10px;
}

.footer-col ul li a {
    font-size: 0.88rem;
    transition: var(--transition);
}

.footer-col ul li a:hover {
    color: var(--accent);
    padding-left: 4px;
}

.footer-contact-item {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    margin-bottom: 12px;
    font-size: 0.85rem;
}

.footer-contact-item svg {
    width: 16px;
    height: 16px;
    fill: var(--accent);
    flex-shrink: 0;
    margin-top: 3px;
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.08);
    padding: 20px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.82rem;
}

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

/* ===========================
   Page Header (inner pages)
   =========================== */
.page-header {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    color: white;
    padding: 60px 0;
    text-align: center;
}

.page-header h1 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 12px;
}

.page-header p {
    font-size: 1.1rem;
    color: rgba(255,255,255,0.75);
}

.breadcrumb {
    display: flex;
    gap: 8px;
    font-size: 0.85rem;
    color: rgba(255,255,255,0.5);
    justify-content: center;
    margin-top: 16px;
}

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

/* ===========================
   Responsive
   =========================== */
@media (max-width: 968px) {
    .hero-content,
    .about-content,
    .contact-content {
        grid-template-columns: 1fr;
    }

    .hero-visual {
        display: none;
    }

    .hero-text h1 {
        font-size: 2.2rem;
    }

    .footer-content {
        grid-template-columns: 1fr 1fr;
    }

    .form-row {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 24px;
        box-shadow: var(--shadow-lg);
        gap: 16px;
    }

    .nav-menu.open {
        display: flex;
    }

    .mobile-toggle {
        display: block;
    }

    .top-bar-info {
        font-size: 0.72rem;
        gap: 12px;
    }

    .top-bar-links {
        display: none;
    }

    .hero {
        padding: 48px 0 64px;
    }

    .hero-text h1 {
        font-size: 1.8rem;
    }

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

    .hero-stats {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .section {
        padding: 56px 0;
    }

    .section-title {
        font-size: 1.6rem;
    }

    .products-toolbar {
        flex-direction: column;
        align-items: stretch;
    }

    .search-box {
        max-width: none;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 8px;
        text-align: center;
    }

    .page-header h1 {
        font-size: 1.8rem;
    }

    .inquiry-form {
        padding: 24px;
    }
}

/* ===========================
   Animations
   =========================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeInUp 0.6s ease forwards;
}

.fade-in-delay-1 { animation-delay: 0.1s; opacity: 0; }
.fade-in-delay-2 { animation-delay: 0.2s; opacity: 0; }
.fade-in-delay-3 { animation-delay: 0.3s; opacity: 0; }

/* Loading skeleton */
.skeleton {
    background: linear-gradient(90deg, var(--gray-50) 25%, var(--gray-100) 50%, var(--gray-50) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* Scroll to top */
.scroll-top {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 44px;
    height: 44px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
    box-shadow: var(--shadow-md);
}

.scroll-top.show {
    opacity: 1;
    visibility: visible;
}

.scroll-top:hover {
    background: var(--accent);
    transform: translateY(-4px);
}

.scroll-top svg {
    width: 20px;
    height: 20px;
    fill: white;
}

/* ===========================
   WhatsApp Floating Button
   =========================== */
.whatsapp-float {
    position: fixed;
    bottom: 24px;
    right: 24px;
    background: #25D366;
    color: white;
    padding: 12px 20px;
    border-radius: 50px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 6px 20px rgba(37, 211, 102, 0.4);
    z-index: 999;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    transition: all 0.3s ease;
}

.whatsapp-float:hover {
    background: #1ea952;
    transform: translateY(-3px);
    box-shadow: 0 10px 28px rgba(37, 211, 102, 0.5);
    color: white;
}

.whatsapp-float svg {
    width: 24px;
    height: 24px;
    fill: white;
    flex-shrink: 0;
}

@media (max-width: 768px) {
    .whatsapp-float {
        bottom: 16px;
        right: 16px;
        padding: 10px 16px;
        font-size: 0.85rem;
    }
    .whatsapp-float svg {
        width: 20px;
        height: 20px;
    }
}

@media (max-width: 480px) {
    .whatsapp-float span {
        display: none;
    }
    .whatsapp-float {
        padding: 12px;
        border-radius: 50%;
    }
}

/* ===========================
   Product Detail Page
   =========================== */
.product-detail {
    padding: 40px 0 80px;
}

.product-detail-breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    color: var(--gray-500);
    margin-bottom: 32px;
}

.product-detail-breadcrumb a {
    color: var(--gray-700);
}

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

.product-detail-breadcrumb .separator {
    color: var(--gray-300);
}

.product-detail-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    margin-bottom: 64px;
}

.product-detail-image {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    background: var(--gray-50);
    position: relative;
    height: 440px;
}

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

.product-detail-image .product-category-tag {
    position: absolute;
    top: 16px;
    left: 16px;
    padding: 6px 14px;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 600;
    background: rgba(10,61,98,0.9);
    color: white;
    backdrop-filter: blur(4px);
}

.product-detail-image .product-grade {
    position: absolute;
    top: 16px;
    right: 16px;
    padding: 6px 14px;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 700;
    color: white;
}

.product-detail-info h1 {
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary-dark);
    margin-bottom: 6px;
    line-height: 1.2;
}

.product-detail-info .product-name-cn {
    font-size: 1.05rem;
    color: var(--gray-500);
    margin-bottom: 20px;
}

.product-detail-info .product-description {
    font-size: 1rem;
    color: var(--gray-700);
    line-height: 1.8;
    margin-bottom: 28px;
}

.product-detail-specs {
    background: var(--gray-50);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 28px;
}

.product-detail-specs h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--primary-dark);
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--gray-100);
}

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

.specs-table tr {
    border-bottom: 1px solid var(--gray-100);
}

.specs-table tr:last-child {
    border-bottom: none;
}

.specs-table th {
    text-align: left;
    padding: 10px 0;
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--gray-700);
    width: 40%;
}

.specs-table td {
    padding: 10px 0;
    font-size: 0.88rem;
    color: var(--gray-900);
}

.product-detail-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.product-detail-actions .btn {
    padding: 14px 28px;
    font-size: 0.95rem;
}

.btn-whatsapp {
    background: #25D366;
    color: white;
}

.btn-whatsapp:hover {
    background: #1ea952;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(37, 211, 102, 0.4);
}

.product-detail-meta {
    display: flex;
    gap: 16px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.product-detail-meta-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    color: var(--gray-700);
    background: var(--gray-50);
    padding: 6px 14px;
    border-radius: 20px;
}

.product-detail-meta-item .dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.product-detail-meta-item .dot.high { background: var(--success); }
.product-detail-meta-item .dot.medium { background: var(--warning); }
.product-detail-meta-item .dot.low { background: var(--gray-500); }
.product-detail-meta-item .dot.mid-high { background: var(--accent); }

/* Related Products */
.related-products {
    background: var(--gray-50);
    padding: 64px 0;
}

.related-products .section-header {
    margin-bottom: 40px;
}

.related-products .section-title {
    font-size: 1.6rem;
}

/* Product not found */
.product-not-found {
    text-align: center;
    padding: 80px 20px;
}

.product-not-found h2 {
    font-size: 1.8rem;
    color: var(--gray-700);
    margin-bottom: 12px;
}

.product-not-found p {
    color: var(--gray-500);
    margin-bottom: 24px;
}

/* Responsive - Product Detail */
@media (max-width: 968px) {
    .product-detail-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .product-detail-image {
        height: 300px;
    }

    .product-detail-info h1 {
        font-size: 1.6rem;
    }
}

@media (max-width: 768px) {
    .product-detail-breadcrumb {
        font-size: 0.78rem;
    }

    .specs-table th {
        width: 45%;
    }
}

/* ===========================
   Blog Pages
   =========================== */

/* Breadcrumbs */
.breadcrumbs {
    background: var(--gray-50);
    padding: 14px 0;
    border-bottom: 1px solid var(--gray-100);
    font-size: 0.85rem;
    color: var(--gray-500);
}

.breadcrumbs a {
    color: var(--gray-700);
}

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

/* Page Hero (blog listing) */
.page-hero {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    color: white;
    padding: 64px 0;
    text-align: center;
}

.page-hero h1 {
    font-size: 2.4rem;
    font-weight: 800;
    margin-bottom: 12px;
}

.page-hero p {
    font-size: 1.1rem;
    color: rgba(255,255,255,0.75);
    max-width: 600px;
    margin: 0 auto;
}

/* Blog Grid (listing page) */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
    gap: 32px;
}

.blog-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: 32px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-50);
    transition: var(--transition);
}

.blog-card:hover {
    box-shadow: var(--shadow-lg);
    border-color: var(--gray-300);
    transform: translateY(-4px);
}

.blog-card-meta {
    display: flex;
    gap: 16px;
    margin-bottom: 16px;
}

.blog-card-date {
    font-size: 0.82rem;
    color: var(--gray-500);
}

.blog-card-category {
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.blog-card h2 {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--primary-dark);
    margin-bottom: 12px;
    line-height: 1.4;
}

.blog-card h2 a {
    color: inherit;
}

.blog-card h2 a:hover {
    color: var(--accent);
}

.blog-card p {
    font-size: 0.92rem;
    color: var(--gray-700);
    line-height: 1.7;
    margin-bottom: 16px;
}

.blog-card-topics {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.blog-tag {
    font-size: 0.75rem;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: 20px;
    background: var(--gray-50);
    color: var(--gray-700);
}

/* Blog Post (article page) */
.blog-post {
    padding: 0 0 80px;
}

.blog-post-header {
    padding: 48px 0 32px;
    border-bottom: 1px solid var(--gray-100);
    margin-bottom: 40px;
}

.blog-post-meta {
    display: flex;
    gap: 16px;
    margin-bottom: 20px;
}

.blog-post-date {
    font-size: 0.85rem;
    color: var(--gray-500);
}

.blog-post-category {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.blog-post-header h1 {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--primary-dark);
    margin-bottom: 16px;
    line-height: 1.3;
}

.blog-post-excerpt {
    font-size: 1.1rem;
    color: var(--gray-700);
    line-height: 1.7;
    max-width: 800px;
}

.blog-post-content {
    max-width: 800px;
    font-size: 1rem;
    color: var(--gray-900);
    line-height: 1.85;
}

.blog-post-content h2 {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--primary-dark);
    margin: 48px 0 16px;
    padding-top: 24px;
    border-top: 1px solid var(--gray-100);
}

.blog-post-content h2:first-of-type {
    border-top: none;
    margin-top: 0;
    padding-top: 0;
}

.blog-post-content p {
    margin-bottom: 16px;
}

.blog-post-content ul,
.blog-post-content ol {
    margin-bottom: 16px;
    padding-left: 24px;
}

.blog-post-content ul {
    list-style: disc;
}

.blog-post-content ol {
    list-style: decimal;
}

.blog-post-content li {
    margin-bottom: 8px;
}

.blog-post-content a {
    color: var(--accent);
    font-weight: 600;
}

.blog-post-content a:hover {
    text-decoration: underline;
}

.blog-post-content strong {
    color: var(--primary-dark);
}

/* Blog Table */
.blog-table {
    width: 100%;
    border-collapse: collapse;
    margin: 24px 0;
    font-size: 0.92rem;
}

.blog-table thead {
    background: var(--primary-dark);
    color: white;
}

.blog-table th {
    padding: 12px 16px;
    text-align: left;
    font-weight: 600;
}

.blog-table td {
    padding: 10px 16px;
    border-bottom: 1px solid var(--gray-100);
}

.blog-table tbody tr:hover {
    background: var(--gray-50);
}

/* Blog CTA */
.blog-cta {
    display: flex;
    gap: 12px;
    margin: 40px 0;
    flex-wrap: wrap;
}

.blog-cta .btn-outline {
    color: var(--primary);
    border-color: var(--primary);
}

.blog-cta .btn-outline:hover {
    color: white;
    background: var(--primary);
}

/* Blog Post Nav */
.blog-post-nav {
    margin-top: 48px;
    padding-top: 24px;
    border-top: 1px solid var(--gray-100);
}

.blog-back-link {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--gray-700);
}

.blog-back-link:hover {
    color: var(--accent);
}

/* Responsive - Blog */
@media (max-width: 768px) {
    .blog-grid {
        grid-template-columns: 1fr;
    }

    .blog-post-header h1 {
        font-size: 1.6rem;
    }

    .page-hero h1 {
        font-size: 1.8rem;
    }

    .blog-card {
        padding: 24px;
    }

    .blog-post-content {
        font-size: 0.95rem;
    }
}