/* ========================================
   北京宝和泰科技 - 简洁商务风格
   ======================================== */

/* CSS变量 */
:root {
    --primary: #2563eb;
    --primary-light: #3b82f6;
    --primary-dark: #1d4ed8;
    --accent: #dbeafe;
    --bg-white: #ffffff;
    --bg-gray: #f8fafc;
    --bg-light: #f1f5f9;
    --text-dark: #1e293b;
    --text-gray: #64748b;
    --text-light: #94a3b8;
    --border: #e2e8f0;
    --shadow: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1);
    --radius: 8px;
    --radius-lg: 16px;
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--text-dark);
    background: var(--bg-white);
    line-height: 1.6;
}

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

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

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

/* 容器 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

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

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

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

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
    font-size: 18px;
}

.logo-text .name {
    display: block;
    font-weight: bold;
    font-size: 18px;
    color: var(--text-dark);
}

.logo-text .en {
    display: block;
    font-size: 11px;
    color: var(--text-light);
    letter-spacing: 1px;
}

.nav {
    display: flex;
    gap: 32px;
}

.nav-link {
    font-size: 15px;
    font-weight: 500;
    color: var(--text-gray);
    transition: var(--transition);
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: var(--transition);
}

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

.header-contact {
    display: flex;
    align-items: center;
    gap: 16px;
}

.header-contact a {
    font-size: 14px;
    color: var(--text-gray);
    transition: var(--transition);
}

.header-contact a:hover {
    color: var(--primary);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background: var(--text-dark);
    transition: var(--transition);
}

/* 移动端菜单 */
.mobile-menu {
    display: none;
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--bg-white);
    box-shadow: var(--shadow-lg);
    padding: 16px;
    z-index: 999;
}

.mobile-menu.active {
    display: block;
}

.mobile-menu a {
    display: block;
    padding: 12px 16px;
    font-size: 15px;
    color: var(--text-gray);
    border-radius: var(--radius);
    transition: var(--transition);
}

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

/* ========================================
   Hero区
   ======================================== */
.hero {
    position: relative;
    padding: 140px 0 80px;
    background: linear-gradient(180deg, #eff6ff 0%, var(--bg-white) 100%);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 50%;
    right: -200px;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(37, 99, 235, 0.1) 0%, transparent 70%);
    transform: translateY(-50%);
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: 50px;
    font-size: 14px;
    color: var(--primary);
    margin-bottom: 24px;
}

.hero-badge .dot {
    width: 8px;
    height: 8px;
    background: var(--primary);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.hero h1 {
    font-size: 48px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 20px;
}

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

.text-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-desc {
    font-size: 18px;
    color: var(--text-gray);
    margin-bottom: 32px;
    line-height: 1.8;
}

.hero-btns {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 60px;
}

/* 按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    font-size: 15px;
    font-weight: 600;
    border-radius: var(--radius);
    transition: var(--transition);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: white;
}

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

.btn-secondary {
    background: var(--bg-white);
    color: var(--primary);
    border: 1px solid var(--primary);
}

.btn-secondary:hover {
    background: var(--accent);
}

/* 统计数字 */
.hero-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
    max-width: 800px;
    margin: 0 auto;
}

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

.stat-value {
    display: block;
    font-size: 36px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 4px;
}

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

/* ========================================
   通用区块
   ======================================== */
.section {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 48px;
}

.section-tag {
    display: inline-block;
    font-size: 14px;
    font-weight: 500;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 8px;
}

.section-title {
    font-size: 36px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.section-desc {
    font-size: 16px;
    color: var(--text-gray);
    max-width: 600px;
    margin: 0 auto;
}

/* ========================================
   产品区
   ======================================== */
.products-section {
    background: var(--bg-gray);
}

.search-bar {
    max-width: 600px;
    margin: 0 auto 32px;
    position: relative;
}

.search-bar input {
    width: 100%;
    padding: 14px 50px 14px 20px;
    font-size: 15px;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    background: var(--bg-white);
    transition: var(--transition);
}

.search-bar input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.search-btn {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-gray);
    transition: var(--transition);
}

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

.search-btn svg {
    width: 20px;
    height: 20px;
}

.filter-tags {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 16px;
}

.filter-label {
    font-size: 14px;
    color: var(--text-gray);
    margin-right: 8px;
}

.filter-tag {
    padding: 6px 16px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-gray);
    background: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: 50px;
    transition: var(--transition);
}

.filter-tag:hover {
    border-color: var(--primary);
    color: var(--primary);
}

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

.search-result-info {
    text-align: center;
    font-size: 14px;
    color: var(--text-gray);
    margin-bottom: 24px;
}

.search-result-info span {
    color: var(--primary);
    font-weight: 600;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

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

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

.product-image {
    height: 180px;
    background: linear-gradient(135deg, #f1f5f9, #e2e8f0);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.product-image img {
    max-height: 80%;
    max-width: 80%;
    object-fit: contain;
}

.product-brand {
    position: absolute;
    top: 12px;
    right: 12px;
    padding: 4px 10px;
    background: var(--bg-white);
    border-radius: 50px;
    font-size: 12px;
    font-weight: 500;
    color: var(--primary);
    box-shadow: var(--shadow);
}

.product-placeholder {
    width: 80px;
    height: 80px;
    background: var(--bg-white);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow);
}

.product-placeholder svg {
    width: 40px;
    height: 40px;
    color: var(--text-light);
}

.product-info {
    padding: 20px;
}

.product-category {
    font-size: 12px;
    font-weight: 500;
    color: var(--primary-light);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 8px;
}

.product-name {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 4px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.product-model {
    font-size: 13px;
    color: var(--text-light);
    font-family: monospace;
    margin-bottom: 8px;
}

.product-desc {
    font-size: 14px;
    color: var(--text-gray);
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 12px;
}

.product-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 12px;
    border-top: 1px solid var(--border);
}

.product-details {
    font-size: 12px;
    color: var(--text-light);
}

.product-link {
    font-size: 14px;
    font-weight: 500;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 4px;
}

.product-link:hover {
    text-decoration: underline;
}

.loading {
    grid-column: 1 / -1;
    text-align: center;
    padding: 60px;
    color: var(--text-gray);
}

/* ========================================
   品牌区
   ======================================== */
.brands-section {
    background: var(--bg-white);
}

.brands-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.brand-card {
    padding: 32px;
    background: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: var(--transition);
}

.brand-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
}

.brand-logo {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    background: linear-gradient(135deg, #eff6ff, #dbeafe);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.brand-card:hover .brand-logo {
    transform: scale(1.05);
}

.brand-letter {
    font-size: 32px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.brand-name {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.brand-desc {
    font-size: 14px;
    color: var(--text-gray);
    line-height: 1.6;
}

/* ========================================
   关于我们
   ======================================== */
.about-section {
    background: var(--bg-gray);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-content .section-tag,
.about-content .section-title {
    text-align: left;
}

.about-text {
    margin: 24px 0;
}

.about-text p {
    font-size: 15px;
    color: var(--text-gray);
    line-height: 1.8;
    margin-bottom: 16px;
}

.about-values {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.value-item {
    text-align: center;
    padding: 16px;
    background: var(--bg-white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.value-title {
    display: block;
    font-size: 15px;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 4px;
}

.value-desc {
    font-size: 12px;
    color: var(--text-gray);
}

.about-visual {
    position: relative;
}

.about-card {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    padding: 40px;
    box-shadow: var(--shadow-lg);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.about-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--primary-light));
}

.about-logo {
    font-size: 64px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 16px;
}

.about-card h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 16px;
}

.about-card p {
    font-size: 14px;
    color: var(--text-gray);
    margin-bottom: 8px;
}

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

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact-info h3,
.contact-links h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 20px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px;
    background: var(--bg-gray);
    border-radius: var(--radius);
    margin-bottom: 12px;
    transition: var(--transition);
}

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

.contact-icon {
    width: 48px;
    height: 48px;
    background: var(--accent);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    transition: var(--transition);
}

.contact-icon svg {
    width: 24px;
    height: 24px;
}

.contact-icon.wechat {
    background: #f0fdf4;
    color: #16a34a;
}

.contact-label {
    display: block;
    font-size: 13px;
    color: var(--text-gray);
    margin-bottom: 2px;
}

.contact-value {
    font-size: 15px;
    font-weight: 500;
    color: var(--text-dark);
}

a.contact-value:hover {
    color: var(--primary);
}

.contact-links {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.links-box {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.link-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    background: var(--bg-gray);
    border-radius: var(--radius);
    font-size: 14px;
    color: var(--text-gray);
    transition: var(--transition);
}

.link-item::before {
    content: '';
    width: 6px;
    height: 6px;
    background: var(--primary);
    border-radius: 50%;
}

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

/* ========================================
   页脚
   ======================================== */
.footer {
    background: var(--text-dark);
    padding: 40px 0;
}

.footer-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.footer .logo-icon {
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
}

.footer .logo-text .name {
    color: white;
}

.footer .logo-text .en {
    color: var(--text-light);
}

.footer-icp a {
    font-size: 13px;
    color: var(--text-light);
    transition: var(--transition);
}

.footer-icp a:hover {
    color: white;
}

.footer-social {
    display: flex;
    gap: 12px;
}

.social-link {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    transition: var(--transition);
}

.social-link:hover {
    background: var(--primary);
    color: white;
}

.social-link svg {
    width: 20px;
    height: 20px;
}

/* ========================================
   响应式
   ======================================== */
@media (max-width: 1024px) {
    .hero h1 {
        font-size: 40px;
    }
    
    .hero-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .products-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .about-grid,
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .about-content .section-tag,
    .about-content .section-title {
        text-align: center;
    }
}

@media (max-width: 768px) {
    .nav {
        display: none;
    }
    
    .header-contact {
        display: none;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .hero {
        padding: 120px 0 60px;
    }
    
    .hero h1 {
        font-size: 32px;
    }
    
    .hero-desc {
        font-size: 16px;
    }
    
    .hero-btns {
        flex-direction: column;
        align-items: center;
    }
    
    .section {
        padding: 60px 0;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .products-grid,
    .brands-grid {
        grid-template-columns: 1fr;
    }
    
    .about-values {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }
}