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

:root {
    --primary-green: #2e7d32;
    --primary-light: #4caf50;
    --primary-dark: #1b5e20;
    --secondary-green: #66bb6a;
    --accent-green: #81c784;
    --light-green: #e8f5e9;
    --text-dark: #333;
    --text-gray: #666;
    --text-light: #999;
    --bg-white: #fff;
    --bg-gray: #f5f5f5;
    --bg-light: #fafafa;
    --border-color: #e0e0e0;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.2);
}

body {
    font-family: 'Microsoft YaHei', 'PingFang SC', 'Helvetica Neue', Arial, sans-serif;
    color: var(--text-dark);
    line-height: 1.6;
    background-color: var(--bg-white);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.3s ease;
}

ul {
    list-style: none;
}

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

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

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.logo a {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    width: 45px;
    height: 45px;
    background: linear-gradient(135deg, var(--primary-green), var(--primary-light));
    color: white;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 18px;
}

.logo-text {
    font-size: 24px;
    font-weight: bold;
    color: var(--primary-green);
}

.nav-menu {
    display: flex;
    gap: 30px;
}

.nav-menu a {
    font-size: 16px;
    color: var(--text-dark);
    font-weight: 500;
    padding: 8px 0;
    position: relative;
}

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

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-green);
    transition: width 0.3s ease;
}

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

.nav-contact {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-left: 20px;
    padding-left: 25px;
    border-left: 2px solid var(--border-color);
}

.nav-contact-icon {
    width: 42px;
    height: 42px;
    background: linear-gradient(135deg, var(--primary-green), var(--primary-light));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
}

.nav-contact-info {
    display: flex;
    flex-direction: column;
    line-height: 1.3;
}

.nav-contact-label {
    font-size: 12px;
    color: var(--text-gray);
}

.nav-contact-phone {
    font-size: 18px;
    font-weight: 700;
    color: var(--primary-green);
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}

.menu-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--text-dark);
    transition: all 0.3s ease;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-green) 50%, var(--primary-light) 100%);
    color: white;
    padding: 100px 0;
    position: relative;
    overflow: hidden;
}

.hero .container {
    position: relative;
    z-index: 1;
}

.hero-content {
    max-width: 600px;
}

.hero h1 {
    font-size: 48px;
    margin-bottom: 20px;
    font-weight: 700;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.hero h2 {
    font-size: 24px;
    margin-bottom: 30px;
    font-weight: 400;
    opacity: 0.95;
    text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.3);
}

.hero p {
    font-size: 18px;
    margin-bottom: 40px;
    opacity: 0.95;
    line-height: 1.8;
    text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.3);
}

.hero-buttons {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.btn {
    display: inline-block;
    padding: 14px 36px;
    font-size: 16px;
    font-weight: 600;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
    text-align: center;
}

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

.btn-primary:hover {
    background-color: var(--light-green);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: transparent;
    color: white;
    border: 2px solid white;
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

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

.btn-green:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-outline {
    background-color: transparent;
    color: var(--primary-green);
    border: 2px solid var(--primary-green);
}

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

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

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

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

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-size: 36px;
    color: var(--text-dark);
    margin-bottom: 15px;
    font-weight: 700;
}

.section-subtitle {
    font-size: 18px;
    color: var(--text-gray);
    max-width: 600px;
    margin: 0 auto;
}

.section-title-green {
    color: var(--primary-green);
}

/* Features Section */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.feature-card {
    background-color: var(--bg-white);
    padding: 40px 30px;
    border-radius: 12px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    border-top: 4px solid var(--primary-green);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, var(--primary-green), var(--primary-light));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 25px;
    font-size: 30px;
}

.feature-card h3 {
    font-size: 22px;
    margin-bottom: 15px;
    color: var(--text-dark);
}

.feature-card p {
    color: var(--text-gray);
    line-height: 1.7;
}

/* About Preview */
.about-preview {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-image {
    position: relative;
}

.about-image-placeholder {
    width: 100%;
    height: 400px;
    background: var(--bg-light);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.about-image-placeholder img {
    width: 110%;
    height: 110%;
    object-fit: cover;
    object-position: top left;
    transform: scale(1.05);
}

.about-content h2 {
    font-size: 32px;
    margin-bottom: 25px;
    color: var(--text-dark);
}

.about-content p {
    font-size: 16px;
    color: var(--text-gray);
    margin-bottom: 20px;
    line-height: 1.8;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 40px;
}

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

.stat-number {
    font-size: 36px;
    font-weight: 700;
    color: var(--primary-green);
    margin-bottom: 5px;
}

.stat-label {
    font-size: 14px;
    color: var(--text-gray);
}

/* Products Preview */
.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.product-card {
    background-color: var(--bg-white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.product-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.product-image {
    width: 100%;
    height: 220px;
    background: var(--bg-light);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.product-image img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    transition: transform 0.3s ease;
}

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

.product-info {
    padding: 25px;
}

.product-info h3 {
    font-size: 20px;
    margin-bottom: 12px;
    color: var(--text-dark);
}

.product-info p {
    font-size: 14px;
    color: var(--text-gray);
    margin-bottom: 20px;
    line-height: 1.6;
}

.product-link {
    color: var(--primary-green);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 5px;
}

.product-link:hover {
    color: var(--primary-dark);
}

/* Page Banner */
.page-banner {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-green) 50%, var(--primary-light) 100%);
    color: white;
    padding: 80px 0;
    text-align: center;
}

.page-banner h1 {
    font-size: 42px;
    margin-bottom: 15px;
}

.page-banner p {
    font-size: 18px;
    opacity: 0.85;
}

/* About Page */
.about-company {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    margin-bottom: 80px;
}

.about-company-content h2 {
    font-size: 32px;
    margin-bottom: 25px;
    color: var(--primary-green);
}

.about-company-content p {
    font-size: 16px;
    color: var(--text-gray);
    margin-bottom: 20px;
    line-height: 1.8;
}

.values-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.value-card {
    padding: 35px 25px;
    background-color: var(--bg-white);
    border-radius: 12px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.value-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.value-icon {
    font-size: 50px;
    margin-bottom: 20px;
}

.value-card h3 {
    font-size: 20px;
    margin-bottom: 15px;
    color: var(--primary-green);
}

.value-card p {
    font-size: 14px;
    color: var(--text-gray);
    line-height: 1.7;
}

/* Timeline */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    padding: 40px 0;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 4px;
    background-color: var(--secondary-green);
    transform: translateX(-50%);
}

.timeline-item {
    display: flex;
    justify-content: flex-end;
    padding-right: 50%;
    margin-bottom: 50px;
    position: relative;
}

.timeline-item:nth-child(even) {
    justify-content: flex-start;
    padding-right: 0;
    padding-left: 50%;
}

.timeline-content {
    background-color: var(--bg-white);
    padding: 25px 30px;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    max-width: 350px;
    position: relative;
    margin-right: 40px;
}

.timeline-item:nth-child(even) .timeline-content {
    margin-right: 0;
    margin-left: 40px;
}

.timeline-dot {
    position: absolute;
    right: -61px;
    top: 30px;
    width: 20px;
    height: 20px;
    background-color: var(--primary-green);
    border-radius: 50%;
    border: 4px solid var(--bg-white);
    box-shadow: var(--shadow-sm);
}

.timeline-item:nth-child(even) .timeline-dot {
    right: auto;
    left: -61px;
}

.timeline-year {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-green);
    margin-bottom: 10px;
}

.timeline-content h4 {
    font-size: 18px;
    margin-bottom: 10px;
    color: var(--text-dark);
}

.timeline-content p {
    font-size: 14px;
    color: var(--text-gray);
    line-height: 1.6;
}

/* Products Page */
.products-categories {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 50px;
    flex-wrap: wrap;
}

.category-btn {
    padding: 12px 28px;
    border: 2px solid var(--border-color);
    background-color: var(--bg-white);
    color: var(--text-gray);
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 15px;
    font-weight: 500;
}

.category-btn:hover,
.category-btn.active {
    background-color: var(--primary-green);
    color: white;
    border-color: var(--primary-green);
}

.products-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.product-item {
    background-color: var(--bg-white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.product-item:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.product-item-image {
    width: 100%;
    height: 280px;
    background: var(--bg-light);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.product-item-image img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    transition: transform 0.3s ease;
}

.product-item:hover .product-item-image img {
    transform: scale(1.05);
}

.product-item-content {
    padding: 30px;
}

.product-item-content h3 {
    font-size: 22px;
    margin-bottom: 15px;
    color: var(--text-dark);
}

.product-item-content p {
    font-size: 15px;
    color: var(--text-gray);
    margin-bottom: 20px;
    line-height: 1.7;
}

.product-features {
    margin-bottom: 25px;
}

.product-features li {
    padding: 8px 0;
    color: var(--text-gray);
    font-size: 14px;
    position: relative;
    padding-left: 25px;
}

.product-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-green);
    font-weight: bold;
}

/* Solutions Page */
.solutions-intro {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 60px;
}

.solutions-intro h2 {
    font-size: 32px;
    margin-bottom: 20px;
    color: var(--primary-green);
}

.solutions-intro p {
    font-size: 16px;
    color: var(--text-gray);
    line-height: 1.8;
}

.solution-section {
    margin-bottom: 80px;
}

.solution-section h3 {
    font-size: 28px;
    margin-bottom: 30px;
    color: var(--text-dark);
    text-align: center;
}

.solution-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
}

.solution-content.reverse {
    direction: rtl;
}

.solution-content.reverse > * {
    direction: ltr;
}

.solution-image {
    width: 100%;
    height: 350px;
    background: var(--bg-light);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.solution-image img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.solution-text h4 {
    font-size: 22px;
    margin-bottom: 20px;
    color: var(--primary-green);
}

.solution-text p {
    font-size: 15px;
    color: var(--text-gray);
    margin-bottom: 20px;
    line-height: 1.8;
}

.solution-features li {
    padding: 10px 0;
    color: var(--text-gray);
    font-size: 15px;
    position: relative;
    padding-left: 30px;
}

.solution-features li::before {
    content: '◆';
    position: absolute;
    left: 0;
    color: var(--primary-green);
    font-size: 14px;
}

/* Cases Page */
.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.case-card {
    background-color: var(--bg-white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.case-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.case-image {
    width: 100%;
    height: 280px;
    background: var(--bg-light);
    position: relative;
    overflow: hidden;
}

.case-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
}

.case-category {
    position: absolute;
    top: 20px;
    left: 20px;
    background-color: var(--primary-green);
    color: white;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 500;
}

.case-content {
    padding: 25px;
}

.case-content h3 {
    font-size: 20px;
    margin-bottom: 12px;
    color: var(--text-dark);
}

.case-content p {
    font-size: 14px;
    color: var(--text-gray);
    margin-bottom: 15px;
    line-height: 1.7;
}

.case-meta {
    display: flex;
    gap: 20px;
    padding-top: 15px;
    border-top: 1px solid var(--border-color);
    font-size: 13px;
    color: var(--text-light);
}

/* Contact Page */
.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 60px;
}

.contact-info-section {
    background-color: var(--primary-green);
    color: white;
    padding: 50px 40px;
    border-radius: 12px;
}

.contact-info-section h3 {
    font-size: 26px;
    margin-bottom: 30px;
}

.contact-item {
    display: flex;
    gap: 20px;
    margin-bottom: 30px;
    align-items: flex-start;
}

.contact-icon {
    width: 50px;
    height: 50px;
    background-color: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    flex-shrink: 0;
}

.contact-text h4 {
    font-size: 18px;
    margin-bottom: 8px;
}

.contact-text p {
    font-size: 15px;
    opacity: 0.9;
    line-height: 1.6;
}

.contact-form-section {
    background-color: var(--bg-white);
    padding: 50px 40px;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
}

.contact-form-section h3 {
    font-size: 26px;
    margin-bottom: 10px;
    color: var(--text-dark);
}

.contact-form-section > p {
    color: var(--text-gray);
    margin-bottom: 30px;
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-dark);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 15px;
    transition: border-color 0.3s ease;
    font-family: inherit;
}

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

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

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.submit-btn {
    width: 100%;
    padding: 16px;
    background-color: var(--primary-green);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.submit-btn:hover {
    background-color: var(--primary-dark);
}

/* Footer */
.footer {
    background-color: #1a2e1a;
    color: #ccc;
    padding: 60px 0 20px;
}

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

.footer-section h4 {
    color: white;
    font-size: 18px;
    margin-bottom: 20px;
}

.footer-section ul li {
    margin-bottom: 12px;
}

.footer-section ul li a {
    color: #aaa;
    font-size: 14px;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: var(--secondary-green);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
}

.footer-logo .logo-icon {
    width: 40px;
    height: 40px;
    font-size: 16px;
}

.footer-logo .logo-text {
    color: white;
    font-size: 22px;
}

.footer-desc {
    font-size: 14px;
    line-height: 1.7;
    color: #aaa;
}

.contact-info li {
    display: flex;
    gap: 10px;
    color: #aaa;
    font-size: 14px;
}

.footer-bottom {
    border-top: 1px solid #333;
    padding-top: 20px;
    text-align: center;
    font-size: 14px;
    color: #888;
}

/* Responsive */
@media (max-width: 992px) {
    .about-preview,
    .about-company,
    .solution-content,
    .contact-wrapper {
        grid-template-columns: 1fr;
    }

    .solution-content.reverse {
        direction: ltr;
    }

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

    .hero h1 {
        font-size: 36px;
    }

    .section-title {
        font-size: 28px;
    }

    .timeline::before {
        left: 20px;
    }

    .timeline-item,
    .timeline-item:nth-child(even) {
        padding-right: 0;
        padding-left: 60px;
        justify-content: flex-start;
    }

    .timeline-content,
    .timeline-item:nth-child(even) .timeline-content {
        margin-right: 0;
        margin-left: 0;
        max-width: 100%;
    }

    .timeline-dot,
    .timeline-item:nth-child(even) .timeline-dot {
        right: auto;
        left: 10px;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 80px;
        left: 0;
        right: 0;
        background-color: var(--bg-white);
        flex-direction: column;
        padding: 20px;
        box-shadow: var(--shadow-md);
        gap: 0;
    }

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

    .nav-menu li {
        border-bottom: 1px solid var(--border-color);
    }

    .nav-menu li:last-child {
        border-bottom: none;
    }

    .nav-menu a {
        display: block;
        padding: 15px 0;
    }

    .nav-contact {
        display: none;
    }

    .menu-toggle {
        display: flex;
    }

    .hero {
        padding: 60px 0;
    }

    .hero h1 {
        font-size: 28px;
    }

    .hero h2 {
        font-size: 18px;
    }

    .section {
        padding: 50px 0;
    }

    .section-title {
        font-size: 24px;
    }

    .about-stats {
        grid-template-columns: 1fr;
        gap: 20px;
    }

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

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

    .page-banner {
        padding: 50px 0;
    }

    .page-banner h1 {
        font-size: 32px;
    }

    .contact-info-section,
    .contact-form-section {
        padding: 30px 25px;
    }
}

@media (max-width: 480px) {
    .hero-buttons {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .products-categories {
        flex-direction: column;
        align-items: center;
    }

    .category-btn {
        width: 100%;
        max-width: 250px;
        text-align: center;
    }
}

/* ========== Product Detail & Image Placeholder ========== */
/* 小尺寸按钮 */
.btn-sm {
    padding: 10px 22px;
    font-size: 14px;
}

/* 产品卡片标题链接 */
.product-item-content h3 a,
.product-info h3 a {
    color: var(--text-dark);
}

.product-item-content h3 a:hover,
.product-info h3 a:hover {
    color: var(--primary-green);
}

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

/* 图片占位框（后台补充图片前显示） */
.image-placeholder {
    width: 100%;
    height: 100%;
    min-height: 180px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 10px;
    background: repeating-linear-gradient(45deg, #f7faf7, #f7faf7 12px, #eef5ee 12px, #eef5ee 24px);
    color: var(--text-light);
    text-align: center;
}

.placeholder-icon {
    font-size: 42px;
}

.placeholder-text {
    font-size: 13px;
    letter-spacing: 1px;
}

.image-placeholder-lg {
    min-height: 400px;
    border-radius: 12px;
}

.image-placeholder-lg .placeholder-icon {
    font-size: 64px;
}

/* 面包屑导航 */
.breadcrumb-bar {
    background-color: var(--bg-gray);
    border-bottom: 1px solid var(--border-color);
    padding: 14px 0;
}

.breadcrumb {
    font-size: 14px;
    color: var(--text-light);
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
}

.breadcrumb a {
    color: var(--text-gray);
}

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

.breadcrumb-sep {
    color: #ccc;
}

.breadcrumb-current {
    color: var(--text-dark);
}

/* 产品详情概览 */
.product-detail {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: start;
}

.product-gallery {
    position: sticky;
    top: 100px;
}

.gallery-main {
    width: 100%;
    height: 460px;
    background-color: var(--bg-light);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.gallery-main img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.gallery-thumbs {
    display: flex;
    gap: 12px;
    margin-top: 15px;
}

.gallery-thumb {
    width: 88px;
    height: 88px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    cursor: pointer;
    background-color: var(--bg-light);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: border-color 0.3s ease;
}

.gallery-thumb:hover,
.gallery-thumb.active {
    border-color: var(--primary-green);
}

.gallery-thumb img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.gallery-thumb .image-placeholder {
    min-height: 100%;
    gap: 4px;
    background: transparent;
}

.gallery-thumb .placeholder-icon {
    font-size: 18px;
}

.gallery-thumb .placeholder-text {
    font-size: 10px;
    letter-spacing: 0;
}

/* 产品详情信息 */
.product-detail-info .product-tag {
    display: inline-block;
    background-color: var(--light-green);
    color: var(--primary-green);
    font-size: 13px;
    font-weight: 600;
    padding: 5px 14px;
    border-radius: 50px;
    margin-bottom: 18px;
}

.product-detail-info h1 {
    font-size: 30px;
    line-height: 1.4;
    margin-bottom: 18px;
    color: var(--text-dark);
}

.product-summary {
    font-size: 16px;
    color: var(--text-gray);
    line-height: 1.8;
    margin-bottom: 25px;
    padding-bottom: 25px;
    border-bottom: 1px solid var(--border-color);
}

.product-features-detail {
    margin-bottom: 30px;
}

.product-features-detail li {
    font-size: 15px;
    padding: 10px 0 10px 28px;
}

.product-actions {
    display: flex;
    gap: 15px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.product-hotline {
    display: flex;
    align-items: center;
    gap: 12px;
    background-color: var(--light-green);
    padding: 15px 20px;
    border-radius: 10px;
}

.hotline-icon {
    font-size: 28px;
}

.hotline-label {
    font-size: 13px;
    color: var(--text-gray);
}

.hotline-phone {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary-green);
}

/* 详情内容区块 */
.detail-block {
    background-color: var(--bg-white);
    border-radius: 12px;
    padding: 35px;
    margin-bottom: 30px;
    box-shadow: var(--shadow-sm);
}

.detail-block:last-child {
    margin-bottom: 0;
}

.detail-title {
    font-size: 24px;
    color: var(--primary-green);
    margin-bottom: 20px;
    padding-left: 14px;
    border-left: 4px solid var(--primary-green);
}

.detail-text {
    font-size: 15px;
    color: var(--text-gray);
    line-height: 2;
}

/* 技术参数表 */
.spec-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

.spec-table th,
.spec-table td {
    border: 1px solid var(--border-color);
    padding: 13px 18px;
    text-align: left;
}

.spec-table th {
    width: 220px;
    background-color: var(--bg-light);
    color: var(--text-dark);
    font-weight: 600;
}

.spec-table td {
    color: var(--text-gray);
}

.spec-note {
    margin-top: 15px;
    font-size: 13px;
    color: var(--text-light);
}

/* 应用场景标签 */
.application-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.application-tag {
    background-color: var(--light-green);
    color: var(--primary-dark);
    padding: 9px 20px;
    border-radius: 50px;
    font-size: 14px;
    font-weight: 500;
}

/* 详情页咨询横幅 */
.detail-cta {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-green));
    padding: 50px 0;
}

.detail-cta-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 30px;
    flex-wrap: wrap;
}

.detail-cta-text h2 {
    color: white;
    font-size: 26px;
    margin-bottom: 8px;
}

.detail-cta-text p {
    color: rgba(255, 255, 255, 0.85);
    font-size: 15px;
}

.detail-cta-actions {
    display: flex;
    align-items: center;
    gap: 25px;
}

.detail-cta-phone {
    color: white;
    font-size: 20px;
    font-weight: 700;
}

@media (max-width: 992px) {
    .product-detail {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .product-gallery {
        position: static;
    }
}

@media (max-width: 576px) {
    .gallery-main {
        height: 320px;
    }

    .image-placeholder-lg {
        min-height: 320px;
    }

    .detail-block {
        padding: 25px 18px;
    }

    .spec-table th {
        width: 130px;
    }

    .detail-cta-content {
        flex-direction: column;
        text-align: center;
    }
}

/* ========== Admin Pages ========== */
.admin-body {
    margin: 0;
    padding: 0;
    font-family: 'Microsoft YaHei', sans-serif;
    background: var(--bg-light);
}

/* Admin Login */
.admin-login-wrapper {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-green), var(--primary-light));
    padding: 20px;
}

.admin-login-card {
    background: white;
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
    padding: 50px 45px;
    width: 100%;
    max-width: 420px;
}

.admin-login-header {
    text-align: center;
    margin-bottom: 35px;
}

.admin-logo {
    font-size: 28px;
    font-weight: 800;
    color: var(--primary-green);
    margin-bottom: 10px;
}

.admin-login-header h1 {
    font-size: 24px;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.admin-login-header p {
    color: var(--text-gray);
    margin: 0;
    font-size: 14px;
}

.admin-login-form {
    margin-bottom: 25px;
}

.btn-block {
    width: 100%;
}

.login-btn {
    margin-top: 10px;
    padding: 14px;
    font-size: 16px;
}

.admin-login-footer {
    text-align: center;
}

.admin-login-footer a {
    color: var(--text-gray);
    text-decoration: none;
    font-size: 14px;
}

.admin-login-footer a:hover {
    color: var(--primary-green);
}

/* Admin Layout */
.admin-layout {
    display: flex;
    min-height: 100vh;
}

.admin-sidebar {
    width: 260px;
    background: white;
    box-shadow: 2px 0 8px rgba(0, 0, 0, 0.06);
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    left: 0;
    top: 0;
}

.admin-sidebar-header {
    padding: 30px 25px;
    border-bottom: 1px solid var(--border-color);
}

.admin-sidebar-header .admin-logo {
    font-size: 22px;
    margin-bottom: 4px;
}

.admin-subtitle {
    font-size: 13px;
    color: var(--text-gray);
}

.admin-nav {
    flex: 1;
    padding: 20px 15px;
}

.admin-nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 15px;
    border-radius: 8px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 15px;
    transition: all 0.2s ease;
    margin-bottom: 5px;
}

.admin-nav-item:hover {
    background: var(--bg-light);
    color: var(--primary-green);
}

.admin-nav-item.active {
    background: var(--light-green);
    color: var(--primary-green);
    font-weight: 600;
}

.admin-sidebar-footer {
    padding: 20px;
    border-top: 1px solid var(--border-color);
}

.admin-user {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 15px;
}

.admin-avatar {
    width: 42px;
    height: 42px;
    background: linear-gradient(135deg, var(--primary-green), var(--primary-light));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 18px;
}

.admin-user-info .admin-username {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 14px;
}

.admin-user-info .admin-role {
    font-size: 12px;
    color: var(--text-gray);
}

.admin-logout-btn {
    display: block;
    text-align: center;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    transition: all 0.2s ease;
}

.admin-logout-btn:hover {
    border-color: #e57373;
    color: #e57373;
}

.admin-main {
    flex: 1;
    margin-left: 260px;
    padding: 30px 40px;
}

.admin-header {
    margin-bottom: 30px;
}

.admin-header h2 {
    font-size: 28px;
    color: var(--text-primary);
    margin-bottom: 20px;
}

.admin-stats {
    display: flex;
    gap: 20px;
}

.stat-card {
    background: white;
    padding: 20px 30px;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.stat-number {
    font-size: 32px;
    font-weight: 700;
    color: var(--primary-green);
}

.stat-label {
    font-size: 14px;
    color: var(--text-gray);
    margin-top: 4px;
}

.admin-content {
    background: white;
    border-radius: 12px;
    padding: 30px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

/* Message List */
.message-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.message-card {
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    transition: all 0.3s ease;
}

.message-card:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    border-color: var(--light-green);
}

.message-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 15px;
}

.message-user {
    display: flex;
    align-items: center;
    gap: 12px;
}

.message-avatar {
    width: 44px;
    height: 44px;
    background: linear-gradient(135deg, var(--primary-green), var(--primary-light));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 18px;
}

.message-name {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 15px;
}

.message-time {
    font-size: 12px;
    color: var(--text-gray);
    margin-top: 3px;
}

.message-type {
    background: var(--light-green);
    color: var(--primary-green);
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
}

.message-body {
    margin-bottom: 15px;
    line-height: 1.7;
    color: var(--text-secondary);
}

.message-body p {
    margin: 0;
    white-space: pre-wrap;
    word-break: break-word;
}

.message-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 15px;
    border-top: 1px solid var(--border-color);
}

.message-contact {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
}

.contact-item {
    font-size: 13px;
    color: var(--text-secondary);
}

.contact-label {
    color: var(--text-gray);
}

.delete-btn {
    padding: 7px 16px;
    background: #fef2f2;
    color: #dc2626;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 13px;
    transition: all 0.2s ease;
}

.delete-btn:hover {
    background: #fee2e2;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 60px 20px;
}

.empty-icon {
    font-size: 64px;
    margin-bottom: 20px;
}

.empty-state h3 {
    color: var(--text-primary);
    margin-bottom: 8px;
}

.empty-state p {
    color: var(--text-gray);
    margin: 0;
}

@media (max-width: 768px) {
    .admin-sidebar {
        width: 100%;
        height: auto;
        position: relative;
    }

    .admin-main {
        margin-left: 0;
        padding: 20px;
    }

    .admin-layout {
        flex-direction: column;
    }

    .admin-stats {
        flex-direction: column;
    }

    .message-footer {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }
}