/* ============================================
   大同市大能正大活性炭有限公司 - 企业官网
   ============================================ */

/* CSS Variables */
:root {
    --primary: #0a1f3f;
    --primary-light: #0d2b4e;
    --primary-lighter: #14365e;
    --accent: #c9a84c;
    --accent-hover: #b8943a;
    --white: #ffffff;
    --light-bg: #f5f6f8;
    --gray-100: #f0f1f3;
    --gray-200: #e2e4e7;
    --gray-300: #c5c9ce;
    --gray-400: #9da3ab;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --text: #333333;
    --text-light: #666666;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.1);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);
    --radius: 8px;
    --radius-lg: 12px;
    --transition: all 0.3s ease;
    --max-width: 1400px;
    --header-height: 72px;
}

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

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    color: var(--text);
    line-height: 1.7;
    background: var(--white);
    overflow-x: hidden;
}

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

ul { list-style: none; }

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

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

/* ============================================
   Header & Navigation
   ============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 31, 63, 0.95);
    backdrop-filter: blur(10px);
    height: var(--header-height);
    border-bottom: 2px solid rgba(201, 168, 76, 0.2);
    transition: var(--transition);
}

.header.scrolled {
    box-shadow: var(--shadow-lg);
    background: rgba(10, 31, 63, 0.98);
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--white);
    letter-spacing: 1px;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: var(--accent);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    font-weight: 800;
    color: var(--primary);
    flex-shrink: 0;
}

.logo-text .logo-zh {
    display: block;
    font-size: 0.95rem;
    line-height: 1.2;
}
.logo-text .logo-en {
    display: block;
    font-size: 0.6rem;
    font-weight: 400;
    letter-spacing: 2px;
    color: var(--accent);
    text-transform: uppercase;
}

.nav-list {
    display: flex;
    gap: 4px;
}

.nav-list a {
    display: block;
    padding: 8px 18px;
    color: rgba(255,255,255,0.8);
    font-size: 0.9rem;
    border-radius: 4px;
    transition: var(--transition);
    position: relative;
}

.nav-list a:hover,
.nav-list a.active {
    color: var(--white);
    background: rgba(255,255,255,0.08);
}

.nav-list a::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 20px;
    height: 2px;
    background: var(--accent);
    transition: transform 0.3s ease;
}

.nav-list a:hover::after,
.nav-list a.active::after {
    transform: translateX(-50%) scaleX(1);
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
    padding: 8px;
    background: none;
    border: none;
}

.menu-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--white);
    transition: var(--transition);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, var(--primary) 0%, #0d2847 40%, #14365e 100%);
    overflow: hidden;
    padding-top: var(--header-height);
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -20%;
    width: 80%;
    height: 200%;
    background: radial-gradient(ellipse, rgba(201,168,76,0.06) 0%, transparent 70%);
    transform: rotate(-15deg);
}

.hero::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 120px;
    background: linear-gradient(to top, var(--white), transparent);
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 700px;
}

.hero-badge {
    display: inline-block;
    padding: 6px 16px;
    border: 1px solid rgba(201,168,76,0.4);
    color: var(--accent);
    font-size: 0.8rem;
    letter-spacing: 3px;
    text-transform: uppercase;
    border-radius: 20px;
    margin-bottom: 24px;
}

.hero h1 {
    font-size: 3rem;
    font-weight: 800;
    color: var(--white);
    line-height: 1.25;
    margin-bottom: 20px;
    letter-spacing: 2px;
}

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

.hero p {
    font-size: 1.1rem;
    color: rgba(255,255,255,0.7);
    line-height: 1.8;
    margin-bottom: 36px;
    max-width: 560px;
}

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

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 13px 32px;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: 6px;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    letter-spacing: 0.5px;
}

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

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(201,168,76,0.3);
}

.btn-outline {
    background: transparent;
    color: var(--white);
    border: 1.5px solid rgba(255,255,255,0.3);
}

.btn-outline:hover {
    border-color: var(--white);
    background: rgba(255,255,255,0.06);
}

.hero-stats {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 60px;
    padding-top: 40px;
    border-top: 1px solid rgba(255,255,255,0.1);
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 2.4rem;
    font-weight: 800;
    color: var(--accent);
    line-height: 1;
}

.stat-suffix {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--accent);
}

.stat-label {
    font-size: 0.85rem;
    color: rgba(255,255,255,0.5);
    margin-top: 6px;
    letter-spacing: 1px;
}

/* Hero decorative */
.hero-visual {
    position: absolute;
    right: -100px;
    top: 50%;
    transform: translateY(-50%);
    width: 600px;
    height: 600px;
    border-radius: 50%;
    border: 1px solid rgba(201,168,76,0.08);
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-visual::before {
    content: '';
    width: 400px;
    height: 400px;
    border-radius: 50%;
    border: 1px solid rgba(201,168,76,0.06);
}

.hero-visual::after {
    content: '';
    position: absolute;
    width: 200px;
    height: 200px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(201,168,76,0.15), transparent);
}

/* ============================================
   Section Common
   ============================================ */
.section {
    padding: 100px 0;
}

.section-light {
    background: var(--light-bg);
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-label {
    display: inline-block;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 3px;
    color: var(--accent);
    font-weight: 600;
    margin-bottom: 12px;
}

.section-title {
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 16px;
    letter-spacing: 1px;
}

.section-desc {
    font-size: 1rem;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto;
}

/* ============================================
   About Preview (Home)
   ============================================ */
.about-preview .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}

.about-image-wrapper {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.about-image {
    width: 100%;
    height: 400px;
    background: linear-gradient(135deg, var(--primary-light) 0%, #1a4a7a 50%, var(--primary-lighter) 100%);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.about-image::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 2px,
            rgba(255,255,255,0.02) 2px,
            rgba(255,255,255,0.02) 4px
        );
}

.about-image-content {
    text-align: center;
    color: var(--white);
    z-index: 1;
    padding: 40px;
}

.about-image-content .big-number {
    font-size: 4rem;
    font-weight: 800;
    color: var(--accent);
    line-height: 1;
}

.about-image-content p {
    font-size: 0.9rem;
    opacity: 0.7;
    margin-top: 8px;
    letter-spacing: 2px;
}

.about-text h3 {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 20px;
}

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

.about-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-top: 28px;
}

.about-feature {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 16px;
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

.about-feature-icon {
    width: 44px;
    height: 44px;
    background: var(--primary);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 1.2rem;
    color: var(--accent);
    font-weight: 700;
}

.about-feature h4 {
    font-size: 0.95rem;
    color: var(--primary);
    margin-bottom: 4px;
}

.about-feature p {
    font-size: 0.8rem;
    color: var(--text-light);
    margin: 0;
}

/* ============================================
   Product Features
   ============================================ */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.feature-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 36px 28px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid transparent;
}

.feature-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(201,168,76,0.2);
}

.feature-icon {
    width: 64px;
    height: 64px;
    background: rgba(10,31,63,0.05);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 1.6rem;
    color: var(--accent);
    font-weight: 700;
    transition: var(--transition);
}

.feature-card:hover .feature-icon {
    background: var(--primary);
    color: var(--accent);
}

.feature-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 10px;
}

.feature-card p {
    font-size: 0.9rem;
    color: var(--text-light);
    line-height: 1.7;
}

/* ============================================
   Stats Section
   ============================================ */
.stats-section {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-lighter) 100%);
    padding: 80px 0;
    position: relative;
    overflow: hidden;
}

.stats-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background: repeating-linear-gradient(
        45deg,
        transparent,
        transparent 10px,
        rgba(255,255,255,0.01) 10px,
        rgba(255,255,255,0.01) 20px
    );
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
    position: relative;
    z-index: 1;
}

.stat-box {
    text-align: center;
    padding: 32px 16px;
    border-radius: var(--radius-lg);
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.06);
    transition: var(--transition);
}

.stat-box:hover {
    background: rgba(255,255,255,0.08);
    border-color: rgba(201,168,76,0.2);
}

.stat-box .number {
    font-size: 2.8rem;
    font-weight: 800;
    color: var(--accent);
    line-height: 1;
    margin-bottom: 8px;
}

.stat-box .unit {
    font-size: 1rem;
    color: var(--accent);
    font-weight: 600;
}

.stat-box .label {
    font-size: 0.85rem;
    color: rgba(255,255,255,0.5);
    letter-spacing: 1px;
    margin-top: 8px;
}

/* ============================================
   Page Hero (Sub Pages)
   ============================================ */
.page-hero {
    padding-top: calc(var(--header-height) + 60px);
    padding-bottom: 60px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-lighter) 100%);
    text-align: center;
}

.page-hero h1 {
    font-size: 2.4rem;
    font-weight: 800;
    color: var(--white);
    letter-spacing: 2px;
}

.page-hero .breadcrumb {
    margin-top: 12px;
    font-size: 0.85rem;
    color: rgba(255,255,255,0.5);
}

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

/* ============================================
   Products Page
   ============================================ */
/* Accordion Toggle Bar */
.accordion-toolbar {
    display: flex;
    justify-content: flex-end;
    margin-bottom: 24px;
}

.accordion-toggle-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 22px;
    background: transparent;
    color: var(--accent);
    border: 1.5px solid var(--accent);
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    letter-spacing: 0.5px;
}

.accordion-toggle-btn:hover {
    background: var(--accent);
    color: var(--primary);
}

.accordion-toggle-btn .toggle-icon {
    display: inline-block;
    transition: transform 0.3s ease;
    font-size: 0.75rem;
}

.accordion-toggle-btn.expanded .toggle-icon {
    transform: rotate(180deg);
}

/* Product Detail Accordion */
.product-detail {
    margin-bottom: 16px;
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-200);
    transition: box-shadow 0.3s ease;
}

.product-detail:hover {
    box-shadow: var(--shadow-md);
}

.product-detail-header {
    background: var(--primary);
    padding: 24px 36px;
    color: var(--white);
    display: flex;
    align-items: center;
    gap: 16px;
    cursor: pointer;
    user-select: none;
    transition: background 0.25s ease;
    position: relative;
}

.product-detail-header:hover {
    background: var(--primary-light);
}

.product-detail.active .product-detail-header {
    border-bottom: 2px solid rgba(201,168,76,0.3);
}

/* Accordion chevron */
.product-detail-chevron {
    margin-left: auto;
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: rgba(255,255,255,0.08);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.35s ease, background 0.25s ease;
}

.product-detail-chevron::after {
    content: '';
    display: block;
    width: 8px;
    height: 8px;
    border-right: 2px solid var(--accent);
    border-bottom: 2px solid var(--accent);
    transform: rotate(45deg);
    margin-top: -2px;
    transition: border-color 0.25s ease;
}

.product-detail.active .product-detail-chevron {
    transform: rotate(180deg);
    background: rgba(201,168,76,0.15);
}

.product-detail-number {
    width: 48px;
    height: 48px;
    background: var(--accent);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 1.2rem;
    color: var(--primary);
    font-weight: 700;
}

.product-detail-header h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 4px;
    color: var(--white);
}

.product-detail-header .product-en {
    font-size: 0.75rem;
    color: rgba(255,255,255,0.45);
    letter-spacing: 1px;
}

.product-detail-body {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.45s ease, padding 0.45s ease;
}

.product-detail.active .product-detail-body {
    max-height: 4000px;
    padding: 32px 36px;
}

.product-detail-intro {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 32px;
    align-items: start;
    margin-bottom: 28px;
}

.product-detail-image {
    width: 280px;
    height: 280px;
    border-radius: var(--radius);
    overflow: hidden;
    background: var(--light-bg);
    border: 1px solid var(--gray-200);
    display: flex;
    align-items: center;
    justify-content: center;
}

.product-detail-image img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    padding: 16px;
}

.product-detail-desc {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.product-detail-desc h4 {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--primary);
}

.product-detail-desc p {
    font-size: 0.92rem;
    color: var(--text-light);
    line-height: 1.8;
}

.product-detail-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.product-detail-tags .tag {
    padding: 5px 14px;
    background: rgba(10,31,63,0.06);
    color: var(--primary);
    font-size: 0.8rem;
    border-radius: 4px;
    font-weight: 500;
    border: 1px solid var(--gray-200);
}

/* Spec Table */
.spec-section {
    margin-top: 8px;
}

.spec-section h4 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 16px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--accent);
    display: inline-block;
}

.spec-table-wrapper {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    border-radius: var(--radius);
    border: 1px solid var(--gray-200);
}

.spec-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.82rem;
    min-width: 700px;
}

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

.spec-table thead th {
    padding: 12px 10px;
    text-align: center;
    font-weight: 600;
    font-size: 0.78rem;
    letter-spacing: 0.5px;
    white-space: nowrap;
    border-right: 1px solid rgba(255,255,255,0.1);
}

.spec-table thead th:last-child {
    border-right: none;
}

.spec-table tbody td {
    padding: 10px;
    text-align: center;
    border-bottom: 1px solid var(--gray-100);
    color: var(--text);
    font-size: 0.8rem;
    white-space: nowrap;
}

.spec-table tbody tr:nth-child(even) {
    background: var(--light-bg);
}

.spec-table tbody tr:hover {
    background: rgba(201,168,76,0.06);
}

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

.spec-table tbody tr:last-child td {
    border-bottom: none;
}

/* Product note */
.product-note {
    margin-top: 20px;
    padding: 14px 18px;
    background: rgba(201,168,76,0.06);
    border-left: 3px solid var(--accent);
    border-radius: 0 var(--radius) var(--radius) 0;
    font-size: 0.82rem;
    color: var(--text-light);
}

/* ============================================
   Equipment Page
   ============================================ */
.equipment-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.equipment-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--gray-200);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

.equipment-card-image {
    width: 100%;
    height: 220px;
    overflow: hidden;
    background: var(--light-bg);
}

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

.equipment-card:hover .equipment-card-image img {
    transform: scale(1.05);
}

.equipment-card-info {
    padding: 16px 18px;
}

.equipment-card-info h3 {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 4px;
}

.equipment-card-info p {
    font-size: 0.82rem;
    color: var(--text-light);
}

/* ============================================
   Certifications Page
   ============================================ */

/* Enterprise Profile Highlights */
.profile-highlights {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.highlight-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 36px 28px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-200);
    transition: var(--transition);
}

.highlight-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: rgba(201,168,76,0.2);
}

.highlight-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    background: rgba(10,31,63,0.05);
    border-radius: 16px;
    margin-bottom: 16px;
    color: var(--accent);
    transition: var(--transition);
}

.highlight-card:hover .highlight-icon {
    background: var(--primary);
    color: var(--accent);
}

.highlight-card h3 {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 10px;
}

.highlight-card p {
    font-size: 0.88rem;
    color: var(--text-light);
    line-height: 1.7;
}

/* Enhanced Certification Cards */
.cert-list-enhanced {
    display: flex;
    flex-direction: column;
    gap: 28px;
}

.cert-card-enhanced {
    display: grid;
    grid-template-columns: 340px 1fr;
    gap: 0;
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--gray-200);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    position: relative;
}

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

.cert-card-badge {
    position: absolute;
    top: 20px;
    left: 20px;
    width: 40px;
    height: 40px;
    background: var(--accent);
    color: var(--primary);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 800;
    z-index: 1;
    box-shadow: 0 2px 8px rgba(201,168,76,0.3);
}

.cert-card-image {
    width: 340px;
    height: 260px;
    overflow: hidden;
    background: var(--light-bg);
    border-right: 1px solid var(--gray-100);
}

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

.cert-card-enhanced:hover .cert-card-image img {
    transform: scale(1.03);
}

.cert-card-body {
    padding: 32px 36px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.cert-card-body h3 {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 16px;
}

.cert-meta {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-bottom: 16px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--gray-100);
}

.cert-meta-item {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.cert-meta-label {
    font-size: 0.72rem;
    color: var(--gray-400);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
}

.cert-meta-value {
    font-size: 0.85rem;
    color: var(--primary);
    font-weight: 600;
    font-family: "SF Mono", "Consolas", "Menlo", monospace;
    letter-spacing: 0.3px;
}

.cert-card-desc {
    font-size: 0.88rem;
    color: var(--text-light);
    line-height: 1.7;
}

/* ============================================
   Quality Control Capabilities
   ============================================ */
.qc-capability-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.qc-capability-card {
    display: flex;
    gap: 16px;
    align-items: flex-start;
    background: var(--white);
    padding: 24px;
    border-radius: var(--radius);
    border: 1px solid var(--gray-200);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.qc-capability-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: rgba(201,168,76,0.15);
}

.qc-capability-icon {
    width: 48px;
    height: 48px;
    min-width: 48px;
    background: rgba(10,31,63,0.04);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent);
    transition: var(--transition);
}

.qc-capability-card:hover .qc-capability-icon {
    background: var(--primary);
    color: var(--accent);
}

.qc-capability-info h4 {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 4px;
}

.qc-capability-info p {
    font-size: 0.8rem;
    color: var(--text-light);
    line-height: 1.6;
}

/* ============================================
   Market & Clients
   ============================================ */
.market-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.market-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 28px 24px;
    border-top: 3px solid var(--accent);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-200);
    transition: var(--transition);
}

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

.market-card-header {
    margin-bottom: 12px;
}

.market-card-header h4 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--primary);
    letter-spacing: 0.5px;
}

.market-card p {
    font-size: 0.85rem;
    color: var(--text-light);
    line-height: 1.7;
}

.market-card b {
    color: var(--primary);
    font-weight: 600;
}

/* ============================================
   Process Page
   ============================================ */
.process-diagram {
    margin-bottom: 48px;
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--gray-200);
    box-shadow: var(--shadow-sm);
}

.process-full-image {
    width: 100%;
    display: block;
}

.process-steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-bottom: 8px;
}

.process-step {
    display: flex;
    gap: 14px;
    align-items: flex-start;
}

.step-number {
    width: 40px;
    height: 40px;
    min-width: 40px;
    background: var(--primary);
    border: 2px solid var(--accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent);
    font-weight: 700;
    font-size: 0.9rem;
}

.step-content h4 {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 4px;
}

.step-content p {
    font-size: 0.82rem;
    color: var(--text-light);
    line-height: 1.6;
}

/* QC Grid */
.qc-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.qc-item {
    background: var(--white);
    padding: 28px 24px;
    border-radius: var(--radius-lg);
    text-align: center;
    border-top: 3px solid var(--accent);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.qc-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.qc-icon {
    margin-bottom: 12px;
    color: var(--accent);
    display: inline-flex;
}

.qc-item h4 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 6px;
}

.qc-item p {
    font-size: 0.82rem;
    color: var(--text-light);
    line-height: 1.6;
}

/* Section Alt Background */
.section-alt {
    background: var(--light-bg);
}

/* ============================================
   About Page
   ============================================ */
.about-detail-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: start;
}

.about-detail-text h2 {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 20px;
}

.about-detail-text p {
    color: var(--text-light);
    line-height: 1.9;
    margin-bottom: 16px;
}

.culture-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 40px;
}

.culture-card {
    background: var(--white);
    padding: 32px 24px;
    border-radius: var(--radius-lg);
    text-align: center;
    border-top: 3px solid var(--accent);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

.culture-card-icon {
    font-size: 2rem;
    margin-bottom: 14px;
    color: var(--accent);
    font-weight: 700;
}

.culture-card h3 {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 8px;
}

.culture-card p {
    font-size: 0.85rem;
    color: var(--text-light);
    line-height: 1.6;
}

.timeline {
    position: relative;
    padding-left: 32px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 8px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--gray-200);
}

.timeline-item {
    position: relative;
    margin-bottom: 28px;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -28px;
    top: 6px;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--accent);
    border: 3px solid var(--white);
    box-shadow: 0 0 0 3px var(--accent);
}

.timeline-year {
    font-size: 0.8rem;
    color: var(--accent);
    font-weight: 700;
    letter-spacing: 2px;
    margin-bottom: 4px;
}

.timeline-item h4 {
    font-size: 1rem;
    color: var(--primary);
    margin-bottom: 4px;
}

.timeline-item p {
    font-size: 0.85rem;
    color: var(--text-light);
}

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

.contact-info h2 {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 12px;
}

.contact-info > p {
    color: var(--text-light);
    margin-bottom: 32px;
}

.contact-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.contact-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.contact-icon {
    width: 48px;
    height: 48px;
    background: rgba(10,31,63,0.05);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 1.1rem;
    color: var(--accent);
    font-weight: 700;
    transition: var(--transition);
}

.contact-item:hover .contact-icon {
    background: var(--primary);
    color: var(--accent);
}

.contact-item h4 {
    font-size: 0.9rem;
    color: var(--primary);
    margin-bottom: 2px;
}

.contact-item p,
.contact-item a {
    font-size: 0.9rem;
    color: var(--text-light);
}

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

.contact-form-wrapper {
    background: var(--white);
    padding: 40px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--gray-200);
}

.contact-form-wrapper h3 {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 24px;
}

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

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

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--gray-200);
    border-radius: 6px;
    font-size: 0.9rem;
    font-family: inherit;
    transition: var(--transition);
    background: var(--light-bg);
    color: var(--text);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
    background: var(--white);
    box-shadow: 0 0 0 3px rgba(201,168,76,0.1);
}

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

.form-submit {
    width: 100%;
    padding: 14px;
    background: var(--primary);
    color: var(--white);
    border: none;
    border-radius: 6px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    letter-spacing: 0.5px;
}

.form-submit:hover {
    background: var(--primary-lighter);
    box-shadow: var(--shadow-md);
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background: var(--primary);
    color: rgba(255,255,255,0.6);
    padding: 60px 0 30px;
}

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

.footer-brand h3,
.footer-about h3 {
    font-size: 1.2rem;
    color: var(--white);
    margin-bottom: 12px;
    letter-spacing: 1px;
}

.footer-brand p,
.footer-about p {
    font-size: 0.85rem;
    line-height: 1.7;
}

.footer-links h4 {
    font-size: 0.95rem;
    color: var(--white);
    margin-bottom: 16px;
    letter-spacing: 0.5px;
}

.footer-links a {
    display: block;
    font-size: 0.85rem;
    color: rgba(255,255,255,0.5);
    margin-bottom: 8px;
    transition: var(--transition);
}

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

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.08);
    padding-top: 24px;
    text-align: center;
    font-size: 0.8rem;
    color: rgba(255,255,255,0.35);
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 1024px) {
    .hero h1 {
        font-size: 2.4rem;
    }
    .hero-visual {
        width: 350px;
        height: 350px;
        right: 2%;
    }
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .product-detail-intro {
        grid-template-columns: 220px 1fr;
        gap: 24px;
    }
    .product-detail-image {
        width: 220px;
        height: 220px;
    }
    .culture-cards {
        grid-template-columns: repeat(2, 1fr);
    }
    .market-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .cert-meta {
        grid-template-columns: 1fr;
    }
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 60px;
    }

    .nav-list {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: rgba(10, 31, 63, 0.98);
        flex-direction: column;
        padding: 16px 0;
        gap: 0;
        transform: translateY(-120%);
        transition: transform 0.4s ease;
        backdrop-filter: blur(10px);
        box-shadow: var(--shadow-lg);
    }

    .nav-list.active {
        transform: translateY(0);
    }

    .nav-list a {
        padding: 14px 24px;
        border-radius: 0;
        font-size: 0.95rem;
    }

    .menu-toggle {
        display: flex;
    }

    .hero {
        text-align: center;
        min-height: auto;
        padding: calc(var(--header-height) + 40px) 0 60px;
    }

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

    .hero p {
        font-size: 0.95rem;
        margin: 0 auto 28px;
    }

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

    .hero-content {
        max-width: 100%;
    }

    .hero-stats {
        grid-template-columns: repeat(3, 1fr);
        gap: 16px;
        margin-top: 40px;
    }

    .stat-number {
        font-size: 1.8rem;
    }

    .hero-visual {
        display: none;
    }

    .section {
        padding: 60px 0;
    }

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

    .about-preview .container {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .about-image {
        height: 280px;
    }

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

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

    .product-detail-intro {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    .product-detail-image {
        width: 100%;
        height: 240px;
        margin: 0 auto;
        max-width: 300px;
    }
    .product-detail-header {
        padding: 20px 24px;
    }
    .product-detail-body {
        padding: 20px 24px;
    }

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

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

    .culture-cards {
        grid-template-columns: 1fr;
    }

    .profile-highlights {
        grid-template-columns: 1fr;
    }

    .cert-card-enhanced {
        grid-template-columns: 1fr;
    }

    .cert-card-image {
        width: 100%;
        height: 240px;
    }

    .cert-card-badge {
        top: 16px;
        left: 16px;
    }

    .cert-card-body {
        padding: 24px;
    }

    .qc-capability-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

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

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 28px;
    }

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

@media (max-width: 480px) {
    .hero h1 {
        font-size: 1.5rem;
        letter-spacing: 1px;
    }
    .hero p {
        font-size: 0.88rem;
    }
    .hero-stats {
        grid-template-columns: repeat(3, 1fr);
        gap: 10px;
    }
    .stat-number {
        font-size: 1.5rem;
    }
    .stat-suffix {
        font-size: 0.9rem;
    }
    .stat-label {
        font-size: 0.7rem;
    }
    .btn {
        padding: 11px 24px;
        font-size: 0.85rem;
    }
    .section-title {
        font-size: 1.4rem;
    }
    .stats-grid {
        grid-template-columns: 1fr 1fr;
        gap: 16px;
    }
    .stat-box .number {
        font-size: 2rem;
    }
    .contact-form-wrapper {
        padding: 24px;
    }

    .qc-capability-grid {
        grid-template-columns: 1fr;
    }
}

/* =============================================
   询价弹窗 & 产品询价按钮
   ============================================= */
.inquiry-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.7);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    overflow-y: auto;
    padding: 20px;
}
.inquiry-overlay.show {
    display: flex;
}
.inquiry-modal {
    background: #12294a;
    border: 1px solid #1e3050;
    border-radius: 12px;
    max-width: 560px;
    width: 100%;
    padding: 32px;
    position: relative;
    color: #dde;
}
.inquiry-modal h3 {
    color: #c8a45c;
    font-size: 20px;
    margin-bottom: 20px;
}
.inquiry-modal-close {
    position: absolute;
    top: 14px;
    right: 20px;
    background: none;
    border: none;
    color: #889;
    font-size: 24px;
    cursor: pointer;
}
.inquiry-modal-close:hover {
    color: #fff;
}
.inquiry-modal .form-group {
    margin-bottom: 14px;
}
.inquiry-modal .form-group label {
    display: block;
    font-size: 13px;
    color: #8899aa;
    margin-bottom: 5px;
}
.inquiry-modal .form-group input,
.inquiry-modal .form-group textarea {
    width: 100%;
    padding: 10px 14px;
    border-radius: 6px;
    border: 1px solid #1e3050;
    background: #0a1628;
    color: #dde;
    font-size: 14px;
    outline: none;
    transition: border 0.2s;
    font-family: inherit;
}
.inquiry-modal .form-group input:focus,
.inquiry-modal .form-group textarea:focus {
    border-color: #c8a45c;
}
.inquiry-modal .form-group textarea {
    resize: vertical;
    min-height: 90px;
}
.inquiry-modal .form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
}
.inquiry-modal .btn {
    width: 100%;
    padding: 12px;
    font-size: 15px;
}

/* 产品询价按钮 */
.product-inquiry-bar {
    padding: 16px 0 8px;
    text-align: center;
    border-top: 1px solid rgba(200,164,92,0.12);
    margin-top: 12px;
}
.btn-quote {
    display: inline-block;
    padding: 10px 28px;
    border-radius: 6px;
    background: #c8a45c;
    color: #0a1628;
    font-size: 14px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: all 0.2s;
}
.btn-quote:hover {
    background: #d4b36a;
    transform: translateY(-1px);
}

@media (max-width: 768px) {
    .inquiry-modal .form-row {
        grid-template-columns: 1fr;
    }
    .inquiry-modal {
        padding: 24px 20px;
    }
}