/* ========== 基础变量 ========== */
:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --secondary-color: #64748b;
    --bg-color: #f8fafc;
    --bg-white: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.1);
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-color);
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

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

/* ========== 通用布局 ========== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.section {
    padding: 80px 0;
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 50px;
    color: var(--text-primary);
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: var(--primary-color);
    margin: 15px auto 0;
    border-radius: 2px;
}

/* ========== 导航栏 ========== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--bg-white);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
}

.logo-img {
    height: 40px;
    width: auto;
    display: block;
}

.logo-text {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

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

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--transition);
    position: relative;
    padding: 5px 0;
}

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

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary-color);
    border-radius: 1px;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 20px;
}

.lang-switch {
    display: flex;
    gap: 5px;
    background: var(--bg-color);
    padding: 4px;
    border-radius: var(--radius-md);
}

.lang-btn {
    padding: 6px 12px;
    border: none;
    background: transparent;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.lang-btn:hover {
    color: var(--primary-color);
}

.lang-btn.active {
    background: var(--bg-white);
    color: var(--primary-color);
    box-shadow: var(--shadow-sm);
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
    border: none;
    background: transparent;
    cursor: pointer;
}

.menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 1px;
    transition: var(--transition);
}

/* ========== Hero 区域 ========== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, rgba(0,0,0,0.6) 0%, rgba(0,0,0,0.4) 100%),
                url('../img/图片1.png') center center / cover no-repeat;
    padding-top: 70px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(37,99,235,0.3) 0%, rgba(16,185,129,0.2) 100%);
    pointer-events: none;
}

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

.hero-title {
    font-size: 3rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 24px;
    color: #ffffff;
    text-shadow: 0 2px 10px rgba(0,0,0,0.5);
}

.hero-subtitle {
    font-size: 1.2rem;
    color: #ffffff;
    max-width: 800px;
    margin-bottom: 40px;
    line-height: 1.8;
    text-shadow: 0 1px 5px rgba(0,0,0,0.5);
}

.hero-features {
    display: flex;
    gap: 30px;
    flex-wrap: wrap;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 24px;
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

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

.feature-icon {
    font-size: 1.5rem;
}

/* ========== 核心技术 ========== */
.tech-section {
    background: var(--bg-white);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.tech-card {
    padding: 30px;
    background: var(--bg-color);
    border-radius: var(--radius-lg);
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.tech-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.tech-icon {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.tech-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.tech-card p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ========== 应用行业 ========== */
.industries-section {
    background: var(--bg-color);
}

.industries-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.industry-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding: 30px 20px;
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    cursor: default;
}

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

.industry-icon {
    font-size: 2.5rem;
}

.industry-item span {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* ========== 行业图片 ========== */
.industry-images {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 40px;
    flex-wrap: wrap;
}

.industry-images img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

/* ========== 服务流程 ========== */
.process-section {
    background: var(--bg-white);
}

.process-steps {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
}

.process-step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    padding: 20px;
    background: var(--bg-color);
    border-radius: var(--radius-lg);
    min-width: 120px;
    transition: var(--transition);
}

.process-step:hover {
    background: var(--primary-color);
    color: white;
}

.process-step:hover .step-num {
    background: white;
    color: var(--primary-color);
}

.step-num {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary-color);
}

.process-step span {
    font-size: 0.9rem;
    font-weight: 500;
}

.step-arrow {
    font-size: 1.5rem;
    color: var(--primary-color);
    font-weight: 300;
}

/* ========== 产品介绍 ========== */
.products-section {
    background: var(--bg-color);
}

.products-grid {
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.product-card {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
}

.product-header {
    padding: 24px 30px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
}

.product-header h3 {
    font-size: 1.5rem;
    font-weight: 700;
}

.product-content {
    padding: 30px;
}

.product-desc {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
}

.product-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-bottom: 30px;
}

.product-feature h4 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--primary-light);
}

.product-feature ul {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.product-feature li {
    font-size: 0.95rem;
    color: var(--text-secondary);
    padding-left: 20px;
    position: relative;
}

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

.product-specs {
    background: var(--bg-color);
    padding: 25px;
    border-radius: var(--radius-md);
}

.product-specs h4 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 15px;
}

.specs-table {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
}

.spec-row {
    display: flex;
    justify-content: space-between;
    padding: 10px 15px;
    background: var(--bg-white);
    border-radius: var(--radius-sm);
}

.spec-row span:first-child {
    font-weight: 500;
    color: var(--text-primary);
}

.spec-row span:last-child {
    color: var(--primary-color);
    font-weight: 600;
}

/* ========== 关于巢目 ========== */
.about-section {
    background: var(--bg-white);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
}

.company-philosophy {
    margin-bottom: 30px;
}

.company-philosophy h3,
.company-info h3,
.timeline h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 15px;
}

.company-philosophy p {
    font-size: 1.1rem;
    color: var(--primary-color);
    font-weight: 600;
    padding: 15px;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.1), rgba(37, 99, 235, 0.05));
    border-radius: var(--radius-md);
    border-left: 4px solid var(--primary-color);
}

.company-info ul {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.company-info li {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.company-info strong {
    color: var(--text-primary);
    font-weight: 600;
}

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

.timeline-item {
    display: flex;
    gap: 20px;
    padding: 20px;
    background: var(--bg-color);
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.timeline-item:hover {
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.08), rgba(37, 99, 235, 0.02));
    transform: translateX(5px);
}

.timeline-item .year {
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--primary-color);
    min-width: 50px;
}

.timeline-item p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ========== 公司图片 ========== */
.company-images {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 30px;
    flex-wrap: wrap;
}

.company-images img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

/* ========== 联系我们 ========== */
.contact-section {
    background: var(--bg-color);
}

.contact-content {
    max-width: 600px;
    margin: 0 auto;
}

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

.contact-item {
    display: flex;
    gap: 20px;
    padding: 25px;
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.contact-item:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-md);
}

.contact-icon {
    font-size: 2rem;
    min-width: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.contact-text h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 5px;
}

.contact-text p {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

/* ========== 页脚 ========== */
.footer {
    background: var(--text-primary);
    color: white;
    padding: 30px 0;
    text-align: center;
}

.footer p {
    font-size: 0.9rem;
    opacity: 0.8;
}

/* ========== 响应式设计 ========== */
@media (max-width: 992px) {
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
}

@media (max-width: 768px) {
    .menu-toggle {
        display: flex;
    }

    .nav {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--bg-white);
        flex-direction: column;
        padding: 20px;
        gap: 15px;
        box-shadow: var(--shadow-md);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }

    .nav.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav .lang-switch {
        display: flex;
        justify-content: center;
        margin-top: 15px;
        padding-top: 15px;
        border-top: 1px solid var(--border-color);
    }

    .header-right {
        width: 100%;
        justify-content: flex-end;
    }

    .lang-switch {
        display: flex;
    }

    .hero {
        background: linear-gradient(135deg, rgba(0,0,0,0.7) 0%, rgba(0,0,0,0.5) 100%),
                    url('../img/图片1.png') center center / cover no-repeat;
    }

    .hero-title {
        font-size: 1.75rem;
    }

    .hero-subtitle {
        font-size: 0.95rem;
        line-height: 1.6;
    }

    .hero-features {
        flex-direction: column;
    }

    .hero-features .feature-item {
        background: rgba(255, 255, 255, 0.95);
        backdrop-filter: blur(5px);
    }

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

    .process-steps {
        flex-direction: column;
    }

    .step-arrow {
        transform: rotate(90deg);
    }

    .section {
        padding: 60px 0;
    }

    .section-title {
        font-size: 1.75rem;
    }
}

@media (max-width: 480px) {
    .hero {
        background: linear-gradient(135deg, rgba(0,0,0,0.75) 0%, rgba(0,0,0,0.6) 100%),
                    url('../img/图片1.png') center center / cover no-repeat;
    }

    .hero-title {
        font-size: 1.5rem;
    }

    .hero-subtitle {
        font-size: 0.9rem;
    }

    .hero-features {
        gap: 10px;
    }

    .feature-item {
        width: 100%;
        justify-content: center;
        padding: 12px 16px;
    }

    .hero-features .feature-item {
        background: rgba(255, 255, 255, 0.98);
    }
    
    .industries-grid {
        grid-template-columns: 1fr 1fr;
        gap: 15px;
    }
    
    .industry-item {
        padding: 20px 15px;
    }
    
    .industry-icon {
        font-size: 2rem;
    }
    
    .product-content {
        padding: 20px;
    }
    
    .product-features {
        grid-template-columns: 1fr;
    }
    
    .timeline-item {
        flex-direction: column;
        gap: 5px;
    }
}