/* ===== 基础样式重置 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 浅色主题变量 */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-accent: #e9ecef;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --text-muted: #adb5bd;
    --border-color: #dee2e6;
    --primary-color: #0066cc;
    --primary-hover: #0052a3;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --card-shadow: 0 2px 4px rgba(0,0,0,0.1);
    --transition: all 0.3s ease;
}

/* 深色主题变量 */
body.dark-theme {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-accent: #404040;
    --text-primary: #ffffff;
    --text-secondary: #cccccc;
    --text-muted: #999999;
    --border-color: #404040;
    --primary-color: #4da3ff;
    --primary-hover: #3d8ce6;
    --secondary-color: #999999;
    --success-color: #4caf50;
    --card-shadow: 0 2px 8px rgba(0,0,0,0.3);
}

body {
    font-family: 'Arial', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    transition: var(--transition);
}

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

/* ===== 导航栏 ===== */
.navbar {
    background-color: var(--bg-primary);
    box-shadow: var(--card-shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: var(--transition);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo {
    width: 40px;
    height: 40px;
    background-color: var(--primary-color);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-text {
    color: white;
    font-weight: bold;
    font-size: 16px;
}

.brand-name {
    font-size: 18px;
    font-weight: bold;
    color: var(--text-primary);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
}

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

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

.nav-menu a.active::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--primary-color);
}

.theme-toggle {
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    background-color: var(--bg-accent);
    transition: var(--transition);
}

.theme-toggle:hover {
    background-color: var(--primary-color);
    color: white;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--text-primary);
    transition: var(--transition);
}

/* ===== 页面标题 ===== */
.page-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-hover) 100%);
    color: white;
    padding: 4rem 0;
    text-align: center;
}

.page-header h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.page-header p {
    font-size: 1.2rem;
    opacity: 0.9;
}

/* ===== Hero Section ===== */
.hero {
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-accent) 100%);
    padding: 6rem 0;
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: 3rem;
    font-weight: bold;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.hero-subtitle {
    font-size: 1.3rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* ===== 按钮样式 ===== */
.btn {
    display: inline-block;
    padding: 12px 24px;
    text-decoration: none;
    border-radius: 6px;
    font-weight: 500;
    text-align: center;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    font-size: 16px;
}

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

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
}

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

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

/* ===== 优势展示 ===== */
.features {
    padding: 5rem 0;
    background-color: var(--bg-primary);
}

.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.section-subtitle {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 3rem;
    font-size: 1.1rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-card {
    background-color: var(--bg-secondary);
    padding: 2rem;
    border-radius: 12px;
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

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

.feature-icon {
    width: 60px;
    height: 60px;
    background-color: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    color: white;
    font-size: 1.5rem;
}

.feature-card h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ===== 企业简介 ===== */
.about-preview {
    padding: 5rem 0;
    background-color: var(--bg-secondary);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.about-text h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.about-text p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 2rem;
}

.tag {
    background-color: var(--bg-accent);
    color: var(--text-secondary);
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.9rem;
    border: 1px solid var(--border-color);
}

.image-placeholder {
    width: 100%;
    height: 300px;
    background-color: var(--bg-accent);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px dashed var(--border-color);
}

.placeholder-content {
    text-align: center;
    color: var(--text-muted);
}

.placeholder-content i {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.placeholder-logo {
    width: 80px;
    height: 80px;
    background-color: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    color: white;
    font-weight: bold;
    font-size: 1.5rem;
}

/* ===== CTA Section ===== */
.cta {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-hover) 100%);
    color: white;
    padding: 4rem 0;
    text-align: center;
}

.cta h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.cta p {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.cta .btn {
    color: white;
}

.cta .btn-secondary {
    border-color: white;
}

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

/* ===== 关于页面样式 ===== */
.about-section,
.brand-partners {
    padding: 5rem 0;
    background-color: var(--bg-primary);
}

.business-scope,
.vision-mission,
.values {
    padding: 5rem 0;
    background-color: var(--bg-secondary);
}

.about-text h2,
.partners-text h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.about-text p,
.partners-text p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.business-grid,
.vision-grid,
.values-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.business-card,
.vision-card,
.value-card {
    background-color: var(--bg-primary);
    padding: 2rem;
    border-radius: 12px;
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

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

.business-icon,
.vision-icon,
.value-icon {
    width: 60px;
    height: 60px;
    background-color: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    color: white;
    font-size: 1.5rem;
}

.business-card h3,
.vision-card h3,
.value-card h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.business-card p,
.vision-card p,
.value-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ===== 产品页面样式 ===== */
.search-filter {
    padding: 2rem 0;
    background-color: var(--bg-secondary);
}

.search-filter-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.search-box {
    position: relative;
    flex: 1;
    min-width: 300px;
}

.search-box i {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
}

.search-box input {
    width: 100%;
    padding: 12px 15px 12px 45px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-size: 16px;
    transition: var(--transition);
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

.filter-buttons {
    display: flex;
    gap: 0.5rem;
}

.filter-btn {
    padding: 12px 20px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-primary);
    color: var(--text-secondary);
    border-radius: 6px;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
}

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

.products {
    padding: 4rem 0;
    background-color: var(--bg-primary);
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.product-card {
    background-color: var(--bg-secondary);
    border-radius: 12px;
    overflow: hidden;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

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

.product-image {
    position: relative;
    height: 250px;
    overflow: hidden;
}

.product-image .image-placeholder {
    width: 100%;
    height: 100%;
    border-radius: 0;
}

.product-category {
    position: absolute;
    top: 15px;
    right: 15px;
    background-color: rgba(0, 102, 204, 0.9);
    color: white;
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
}

.product-info {
    padding: 1.5rem;
}

.product-info h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.product-meta {
    margin-bottom: 1rem;
}

.product-manufacturer,
.product-spec,
.product-approval {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.product-manufacturer i,
.product-spec i,
.product-approval i {
    color: var(--text-muted);
}

.product-efficacy h4 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.product-efficacy p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1.5rem;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.no-results {
    text-align: center;
    padding: 4rem 0;
    color: var(--text-muted);
}

.no-results i {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.no-results h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

/* ===== 联系页面样式 ===== */
.contact-info {
    padding: 4rem 0;
    background-color: var(--bg-secondary);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.contact-card {
    background-color: var(--bg-primary);
    padding: 2rem;
    border-radius: 12px;
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

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

.contact-icon {
    width: 60px;
    height: 60px;
    background-color: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    color: white;
    font-size: 1.5rem;
}

.contact-card h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.contact-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

.contact-main {
    padding: 4rem 0;
    background-color: var(--bg-primary);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
}

.contact-form h2 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.contact-form p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1rem;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 16px;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

.map-section,
.business-consultation {
    background-color: var(--bg-secondary);
    padding: 2rem;
    border-radius: 12px;
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
}

.map-section h2,
.business-consultation h2 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.map-section p,
.business-consultation p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.map-placeholder {
    width: 100%;
    height: 200px;
    background-color: var(--bg-accent);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px dashed var(--border-color);
}

.business-items {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.business-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background-color: var(--bg-primary);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.business-info h4 {
    color: var(--text-primary);
    margin-bottom: 0.3rem;
}

.business-info p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin: 0;
}

/* ===== 页脚样式 ===== */
.footer {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    padding: 3rem 0 1rem;
}

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

.footer-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 1rem;
}

.footer-section h3 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.footer-section p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
}

.contact-item i {
    color: var(--primary-color);
    width: 20px;
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--primary-color);
}

.business-hours {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.hours-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-secondary);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
}

.icp-info {
    margin-top: 0.8rem;
    font-size: 0.9rem;
    line-height: 1.8;
    color: var(--text-muted);
}

.icp-info a {
    color: var(--text-muted);
    text-decoration: none;
    transition: var(--transition);
}

.icp-info a:hover {
    color: var(--primary-color);
    text-decoration: underline;
}

/* ===== 响应式设计 ===== */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: var(--bg-primary);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: var(--card-shadow);
        padding: 2rem 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-menu li {
        margin: 1rem 0;
    }

    .nav-toggle {
        display: flex;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.1rem;
    }

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

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

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

    .search-filter-content {
        flex-direction: column;
        align-items: stretch;
    }

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

    .business-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .hero {
        padding: 4rem 0;
    }

    .features,
    .about-preview,
    .about-section,
    .business-scope,
    .brand-partners,
    .vision-mission,
    .values,
    .products,
    .contact-info,
    .contact-main {
        padding: 3rem 0;
    }

    .hero-buttons,
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 300px;
    }

    .features-grid,
    .business-grid,
    .vision-grid,
    .values-grid,
    .contact-grid,
    .products-grid {
        grid-template-columns: 1fr;
    }

    .page-header h1 {
        font-size: 2rem;
    }

    .section-title {
        font-size: 2rem;
    }
}

/* ===== 动画效果 ===== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.feature-card,
.business-card,
.vision-card,
.value-card,
.contact-card,
.product-card {
    animation: fadeIn 0.6s ease-out;
}

/* ===== 滚动条样式 ===== */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--text-muted);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* ===== 加载动画 ===== */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid var(--bg-accent);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: spin 1s ease-in-out infinite;
}

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