/* ========================================
   Demo - 简约蓝色风格CSS
   ======================================== */

/* CSS变量 */
:root {
    --primary-blue: #2563eb;
    --dark-blue: #1e40af;
    --light-blue: #3b82f6;
    --bg-light: #f8fafc;
    --text-dark: #1e293b;
    --text-gray: #64748b;
    --white: #ffffff;
    --shadow: 0 4px 20px rgba(37, 99, 235, 0.1);
    --shadow-hover: 0 8px 30px rgba(37, 99, 235, 0.15);
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--text-dark);
    line-height: 1.6;
    background: var(--white);
}

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

ul {
    list-style: none;
}

img {
    max-width: 100%;
}

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

/* ========================================
   导航栏
   ======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--white);
    box-shadow: var(--shadow);
    z-index: 1000;
    padding: 15px 0;
}

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

.logo {
    font-size: 28px;
    font-weight: 700;
    color: var(--primary-blue);
    letter-spacing: 2px;
}

.nav-links {
    display: flex;
    gap: 35px;
}

.nav-links a {
    color: var(--text-dark);
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-blue);
    transition: var(--transition);
}

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

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

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

.mobile-menu-btn span {
    display: block;
    width: 25px;
    height: 2px;
    background: var(--text-dark);
    transition: var(--transition);
}

/* ========================================
   海报轮播区域
   ======================================== */
.hero {
    height: 100vh;
    min-height: 600px;
    position: relative;
    overflow: hidden;
}

.slider-container {
    width: 100%;
    height: 100%;
    position: relative;
}

.slider {
    width: 100%;
    height: 100%;
    position: relative;
}

.slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.8s ease, visibility 0.8s ease;
}

.slide.active {
    opacity: 1;
    visibility: visible;
}

.slide-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.slide-bg::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Ccircle cx='30' cy='30' r='2'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.slide-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(30, 64, 175, 0.3);
}

.slide-content {
    position: relative;
    z-index: 1;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--white);
    padding: 20px;
}

.slide-content h1 {
    font-size: 56px;
    font-weight: 700;
    margin-bottom: 20px;
    letter-spacing: 4px;
    animation: fadeInUp 1s ease 0.2s both;
}

.slide-content p {
    font-size: 22px;
    margin-bottom: 40px;
    opacity: 0.95;
    animation: fadeInUp 1s ease 0.4s both;
}

.slide-content .btn-primary {
    animation: fadeInUp 1s ease 0.6s both;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 轮播导航 */
.slider-nav {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 20px;
    z-index: 10;
}

.slider-btn {
    width: 50px;
    height: 50px;
    border: none;
    background: rgba(255, 255, 255, 0.2);
    color: var(--white);
    font-size: 20px;
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition);
    backdrop-filter: blur(10px);
}

.slider-btn:hover {
    background: rgba(255, 255, 255, 0.4);
    transform: scale(1.1);
}

.slider-dots {
    display: flex;
    gap: 12px;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.4);
    cursor: pointer;
    transition: var(--transition);
}

.dot.active {
    background: var(--white);
    transform: scale(1.2);
}

.dot:hover {
    background: rgba(255, 255, 255, 0.8);
}

/* 按钮样式 */
.btn-primary {
    display: inline-block;
    padding: 15px 40px;
    background: var(--white);
    color: var(--primary-blue);
    font-weight: 600;
    border-radius: 50px;
    transition: var(--transition);
    box-shadow: var(--shadow);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
}

/* ========================================
   通用标题样式
   ======================================== */
.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header h2 {
    font-size: 36px;
    color: var(--text-dark);
    margin-bottom: 15px;
    position: relative;
    display: inline-block;
}

.section-header h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--primary-blue);
    border-radius: 2px;
}

.section-header p {
    color: var(--text-gray);
    font-size: 18px;
    margin-top: 20px;
}

/* ========================================
   菜单区域
   ======================================== */
.menu-section {
    padding: 100px 0;
    background: var(--bg-light);
}

.menu-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.menu-item {
    background: var(--white);
    padding: 40px 30px;
    border-radius: 16px;
    text-align: center;
    transition: var(--transition);
    box-shadow: var(--shadow);
}

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

.menu-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

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

.menu-item p {
    color: var(--text-gray);
    font-size: 15px;
}

/* ========================================
   产品介绍
   ======================================== */
.products-section {
    padding: 100px 0;
    background: var(--white);
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.product-card {
    background: var(--white);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

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

.product-image {
    height: 200px;
    background: linear-gradient(135deg, var(--primary-blue), var(--light-blue));
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 20px;
    font-weight: 600;
}

.product-info {
    padding: 30px;
}

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

.product-info p {
    color: var(--text-gray);
    font-size: 15px;
    margin-bottom: 15px;
}

.product-tag {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(37, 99, 235, 0.1);
    color: var(--primary-blue);
    font-size: 13px;
    border-radius: 20px;
    font-weight: 500;
}

/* ========================================
   公司简介
   ======================================== */
.about-section {
    padding: 100px 0;
    background: var(--bg-light);
}

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

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

.about-stats {
    display: flex;
    gap: 50px;
    margin-top: 40px;
    padding-top: 30px;
    border-top: 1px solid #e2e8f0;
}

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

.stat-number {
    display: block;
    font-size: 40px;
    font-weight: 700;
    color: var(--primary-blue);
}

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

.about-image {
    height: 400px;
    background: linear-gradient(135deg, var(--primary-blue), var(--dark-blue));
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 24px;
    font-weight: 600;
}

/* ========================================
   优势
   ======================================== */
.advantages-section {
    padding: 100px 0;
    background: var(--white);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.advantage-card {
    background: var(--white);
    padding: 40px 25px;
    border-radius: 16px;
    border: 1px solid #e2e8f0;
    transition: var(--transition);
}

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

.advantage-number {
    font-size: 48px;
    font-weight: 700;
    color: rgba(37, 99, 235, 0.15);
    margin-bottom: 20px;
}

.advantage-card h3 {
    font-size: 20px;
    color: var(--text-dark);
    margin-bottom: 15px;
}

.advantage-card p {
    color: var(--text-gray);
    font-size: 15px;
    line-height: 1.7;
}

/* ========================================
   新闻
   ======================================== */
.news-section {
    padding: 100px 0;
    background: var(--bg-light);
}

.news-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 30px;
}

.news-card {
    background: var(--white);
    border-radius: 16px;
    padding: 30px;
    display: flex;
    gap: 20px;
    transition: var(--transition);
    box-shadow: var(--shadow);
}

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

.news-highlight {
    grid-column: span 1;
    background: linear-gradient(135deg, var(--primary-blue), var(--dark-blue));
    color: var(--white);
}

.news-highlight .news-date {
    color: rgba(255, 255, 255, 0.7);
}

.news-highlight .news-content p {
    color: rgba(255, 255, 255, 0.85);
}

.news-date {
    text-align: center;
    min-width: 60px;
}

.news-date .day {
    display: block;
    font-size: 32px;
    font-weight: 700;
    color: var(--primary-blue);
}

.news-date .month {
    font-size: 14px;
    color: var(--text-gray);
}

.news-content {
    flex: 1;
}

.news-tag {
    display: inline-block;
    padding: 4px 12px;
    background: rgba(37, 99, 235, 0.1);
    color: var(--primary-blue);
    font-size: 12px;
    border-radius: 4px;
    margin-bottom: 12px;
}

.news-content h3 {
    font-size: 17px;
    margin-bottom: 10px;
    line-height: 1.5;
}

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

.news-link {
    color: var(--primary-blue);
    font-size: 14px;
    font-weight: 500;
}

/* ========================================
   底部导航
   ======================================== */
.footer {
    background: linear-gradient(135deg, #1e293b, #0f172a);
    color: var(--white);
    padding: 80px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1.2fr 1fr;
    gap: 50px;
    margin-bottom: 50px;
}

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

.footer-section > p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
    line-height: 1.7;
}

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

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    transition: var(--transition);
    font-size: 14px;
}

.footer-links a:hover {
    color: var(--white);
    padding-left: 5px;
}

.footer-contact li {
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
    margin-bottom: 12px;
}

.social-links {
    display: flex;
    gap: 15px;
}

.social-icon {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 14px;
    transition: var(--transition);
}

.social-icon:hover {
    background: var(--primary-blue);
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.5);
    font-size: 14px;
}

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 1024px) {
    .menu-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .products-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .mobile-menu-btn {
        display: flex;
    }
    
    .nav-links {
        position: fixed;
        top: 68px;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 20px;
        gap: 15px;
        box-shadow: var(--shadow);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }
    
    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .hero-content h1 {
        font-size: 36px;
    }
    
    .hero-content p {
        font-size: 18px;
    }
    
    .section-header h2 {
        font-size: 28px;
    }
    
    .menu-grid,
    .products-grid,
    .advantages-grid {
        grid-template-columns: 1fr;
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .about-image {
        height: 250px;
    }
    
    .news-grid {
        grid-template-columns: 1fr;
    }
    
    .about-stats {
        flex-wrap: wrap;
        gap: 30px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }
}

@media (max-width: 480px) {
    .hero-content h1 {
        font-size: 28px;
    }
    
    .btn-primary {
        padding: 12px 30px;
        font-size: 15px;
    }
    
    .menu-item,
    .product-info,
    .advantage-card,
    .news-card {
        padding: 25px 20px;
    }
}