/* ==================== CSS Reset ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
    line-height: 1.6;
    color: #333;
    background-color: #fff;
}

ul, ol {
    list-style: none;
}

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

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

button {
    border: none;
    background: none;
    cursor: pointer;
    font-family: inherit;
}

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

.section {
    padding: 80px 0;
}

.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 50px;
    color: #1a1a1a;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, #2563eb, #3b82f6);
    margin: 15px auto 0;
}

.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 5px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.btn-primary {
    background: linear-gradient(135deg, #2563eb, #3b82f6);
    color: #fff;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(37, 99, 235, 0.3);
}

.btn-block {
    display: block;
    width: 100%;
}

/* ==================== 顶部导航栏 ==================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: #fff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    z-index: 1000;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
}

.logo h1 {
    font-size: 1.5rem;
    color: #2563eb;
    font-weight: 700;
}

.nav {
    display: flex;
    align-items: center;
    gap: 30px;
}

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

.nav-link {
    font-weight: 500;
    color: #333;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: #2563eb;
    transition: width 0.3s ease;
}

.nav-link:hover {
    color: #2563eb;
}

.nav-link:hover::after {
    width: 100%;
}

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

.view-counter {
    display: flex;
    align-items: center;
    gap: 5px;
    font-size: 0.9rem;
    color: #666;
}

.login-btn {
    padding: 8px 20px;
    background: linear-gradient(135deg, #2563eb, #3b82f6);
    color: #fff;
    border-radius: 5px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.login-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 3px 10px rgba(37, 99, 235, 0.3);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
}

.nav-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background: #333;
    transition: all 0.3s ease;
    border-radius: 2px;
}

/* ==================== Hero 区 ==================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 50%, #3b82f6 100%);
    color: #fff;
    padding-top: 80px;
}

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

.hero-title {
    font-size: 3rem;
    margin-bottom: 20px;
    font-weight: 700;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 40px;
    opacity: 0.95;
}

/* ==================== 关于我们 ==================== */
.about {
    background: #f8fafc;
}

.about-content {
    max-width: 900px;
    margin: 0 auto;
}

.about-text h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: #1a1a1a;
    margin-top: 30px;
}

.about-text h3:first-child {
    margin-top: 0;
}

.about-text p {
    margin-bottom: 15px;
    color: #555;
    line-height: 1.8;
}

.timeline {
    margin-top: 20px;
}

.timeline li {
    padding: 15px 0;
    border-bottom: 1px solid #e5e7eb;
    color: #555;
}

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

.timeline strong {
    color: #2563eb;
    display: inline-block;
    min-width: 80px;
}

/* ==================== 产品中心 ==================== */
.products {
    background: #fff;
}

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

.product-card {
    background: #fff;
    border-radius: 10px;
    padding: 30px;
    text-align: center;
    box-shadow: 0 3px 15px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    border: 1px solid #e5e7eb;
    cursor: pointer;
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(37, 99, 235, 0.15);
    border-color: #2563eb;
}

.product-image {
    font-size: 4rem;
    margin-bottom: 15px;
}

.product-card h3 {
    font-size: 1.2rem;
    margin-bottom: 10px;
    color: #1a1a1a;
}

/* ==================== 业务范围 ==================== */
.business {
    background: #f8fafc;
}

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

.business-card {
    background: #fff;
    border-radius: 10px;
    padding: 40px 30px;
    text-align: center;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
}

.business-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 30px rgba(37, 99, 235, 0.2);
}

.business-icon {
    font-size: 3rem;
    margin-bottom: 20px;
}

.business-card h3 {
    font-size: 1.25rem;
    margin-bottom: 15px;
    color: #1a1a1a;
}

.business-card p {
    color: #666;
    line-height: 1.7;
}

/* ==================== 联系我们 ==================== */
.contact {
    background: #f8fafc;
}

.contact-content {
    max-width: 900px;
    margin: 0 auto;
}

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

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    background: #fff;
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 3px 15px rgba(0, 0, 0, 0.06);
}

.contact-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.contact-details h3 {
    font-size: 1.1rem;
    margin-bottom: 8px;
    color: #1a1a1a;
}

.contact-details p {
    color: #666;
}

/* ==================== 页脚 ==================== */
.footer {
    background: #1a1a1a;
    color: #fff;
    padding: 40px 0;
    text-align: center;
}

.footer-content p {
    margin-bottom: 10px;
    color: #999;
}

/* ==================== 弹窗样式 ==================== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 2000;
}

.modal.active {
    display: block;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
}

.modal-content {
    position: relative;
    background: #fff;
    border-radius: 12px;
    max-width: 800px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    margin: 50px auto;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
}

.modal-small {
    max-width: 400px;
}

.modal-close {
    position: absolute;
    top: 15px;
    right: 15px;
    width: 36px;
    height: 36px;
    font-size: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #999;
    transition: color 0.3s ease;
    z-index: 10;
}

.modal-close:hover {
    color: #333;
}

/* ==================== 产品详情 ==================== */
.product-detail {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    padding: 30px;
}

.product-detail-image {
    border-radius: 10px;
    overflow: hidden;
    background: #f5f5f5;
}

.product-detail-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    min-height: 300px;
}

.product-detail-info {
    display: flex;
    flex-direction: column;
}

.product-detail-info h2 {
    font-size: 1.8rem;
    margin-bottom: 15px;
    color: #1a1a1a;
}

.product-detail-price {
    font-size: 1.5rem;
    color: #2563eb;
    font-weight: 600;
    margin-bottom: 15px;
}

.product-detail-views {
    display: flex;
    align-items: center;
    gap: 5px;
    color: #666;
    font-size: 0.9rem;
    margin-bottom: 20px;
}

.product-detail-desc {
    color: #666;
    line-height: 1.8;
    margin-bottom: 30px;
}

.product-detail-actions {
    display: flex;
    gap: 15px;
    margin-top: auto;
}

.action-btn {
    flex: 1;
    padding: 12px 20px;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: all 0.3s ease;
}

.action-btn-favorite {
    background: #f5f5f5;
    color: #333;
    border: 1px solid #e5e7eb;
}

.action-btn-favorite:hover {
    background: #fff5f5;
    border-color: #ef4444;
    color: #ef4444;
}

.action-btn-favorite.active {
    background: #fff5f5;
    border-color: #ef4444;
    color: #ef4444;
}

.action-btn-favorite.active .action-icon {
    content: '♥';
}

.action-btn-buy {
    background: linear-gradient(135deg, #2563eb, #3b82f6);
    color: #fff;
}

.action-btn-buy:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(37, 99, 235, 0.3);
}

.action-btn-share {
    background: #f5f5f5;
    color: #333;
    border: 1px solid #e5e7eb;
}

.action-btn-share:hover {
    background: #f0f9ff;
    border-color: #2563eb;
    color: #2563eb;
}

/* ==================== 登录表单 ==================== */
.login-form {
    padding: 30px;
}

.login-form h2 {
    text-align: center;
    margin-bottom: 30px;
    color: #1a1a1a;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: #333;
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #e5e7eb;
    border-radius: 6px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus {
    outline: none;
    border-color: #2563eb;
}

.login-hint {
    text-align: center;
    color: #999;
    font-size: 0.85rem;
    margin-top: 15px;
}

/* ==================== 认证标签 ==================== */
.auth-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 25px;
    border-bottom: 2px solid #e5e7eb;
}

.auth-tab {
    flex: 1;
    padding: 12px;
    background: none;
    border: none;
    font-size: 1rem;
    color: #666;
    cursor: pointer;
    position: relative;
    transition: color 0.3s ease;
}

.auth-tab.active {
    color: #2563eb;
    font-weight: 500;
}

.auth-tab.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: #2563eb;
}

/* ==================== 提示消息 ==================== */
.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: #333;
    color: #fff;
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 0.95rem;
    z-index: 3000;
    opacity: 0;
    transition: all 0.3s ease;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 768px) {
    .section {
        padding: 60px 0;
    }

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

    /* 导航栏移动端样式 */
    .nav {
        flex-wrap: wrap;
    }

    .nav-list {
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        flex-direction: column;
        background: #fff;
        padding: 20px;
        box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
        transform: translateY(-150%);
        transition: transform 0.3s ease;
    }

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

    .nav-list li {
        text-align: center;
        padding: 10px 0;
    }

    .header-right {
        display: none;
    }

    .nav-toggle {
        display: flex;
    }

    /* Hero 区移动端 */
    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    /* 业务卡片移动端 */
    .business-grid {
        grid-template-columns: 1fr;
    }

    /* 联系信息移动端 */
    .contact-info {
        grid-template-columns: 1fr;
    }

    /* 产品详情移动端 */
    .product-detail {
        grid-template-columns: 1fr;
    }

    .product-detail-image img {
        min-height: 200px;
    }

    .product-detail-actions {
        flex-wrap: wrap;
    }

    .action-btn {
        min-width: calc(50% - 7.5px);
    }
}

@media (max-width: 480px) {
    .logo h1 {
        font-size: 1.2rem;
    }

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

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

    .business-card {
        padding: 30px 20px;
    }

    .product-card {
        padding: 20px;
    }

    .modal-content {
        width: 95%;
        margin: 30px auto;
    }

    .product-detail {
        padding: 20px;
    }
}