/* 基础样式和变量 */
:root {
    /* 深蓝商务风格主色调 */
    --primary-color: #1e3a8a;
    --primary-dark: #172554;
    --primary-light: #3b82f6;
    --secondary-color: #0f766e;
    --accent-color: #06b6d4;
    
    /* 中性色调 */
    --text-primary: #1f2937;
    --text-secondary: #4b5563;
    --text-light: #9ca3af;
    --bg-light: #f9fafb;
    --bg-white: #ffffff;
    --border-color: #e5e7eb;
    
    /* 医疗器械行业辅助色 */
    --medical-blue: #1d4ed8;
    --medical-green: #10b981;
    --medical-red: #ef4444;
    --medical-yellow: #f59e0b;
    
    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    
    /* 圆角 */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    
    /* 字体 */
    --font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    color: var(--text-primary);
    line-height: 1.6;
    background-color: var(--bg-light);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 2px solid transparent;
    font-size: 0.95rem;
}

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

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

.btn-outline {
    background-color: transparent;
    color: var(--primary-color);
    border-color: var(--primary-color);
}

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

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

/* 导航栏样式 */
.header {
    background-color: var(--bg-white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
}

.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 0;
}

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: var(--primary-dark);
    font-weight: 700;
    font-size: 1.5rem;
}

.logo img {
    height: 40px;
    margin-right: 0.75rem;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    padding: 0.5rem 0;
    position: relative;
    transition: color 0.3s ease;
}

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

.nav-menu a.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--primary-color);
    border-radius: 1px;
}

.nav-actions {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.hamburger {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-primary);
    cursor: pointer;
}

/* 横幅样式 */
.hero-banner {
    background: 
        /* 旭日东升背景 - 象征新的开始和希望 */
        linear-gradient(rgba(30, 58, 138, 0.85), rgba(30, 58, 138, 0.7)),
        url('../images/sunrise-banner.jpg');
    
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    background-blend-mode: overlay;
    height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: white;
    padding: 2rem;
    position: relative;
    overflow: hidden;
    transition: all 0.5s ease;
}

.hero-banner::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(to bottom right, 
        rgba(255, 140, 0, 0.2) 0%,
        rgba(255, 215, 0, 0.1) 50%,
        rgba(30, 58, 138, 0.1) 100%
    );
    animation: sunrise-glow 15s ease-in-out infinite alternate;
}

@keyframes sunrise-glow {
    0% {
        background: linear-gradient(to bottom right, 
            rgba(255, 140, 0, 0.1) 0%,
            rgba(255, 215, 0, 0.05) 50%,
            rgba(30, 58, 138, 0.05) 100%
        );
    }
    50% {
        background: linear-gradient(to bottom right, 
            rgba(255, 140, 0, 0.3) 0%,
            rgba(255, 215, 0, 0.15) 50%,
            rgba(30, 58, 138, 0.15) 100%
        );
    }
    100% {
        background: linear-gradient(to bottom right, 
            rgba(255, 140, 0, 0.2) 0%,
            rgba(255, 215, 0, 0.1) 50%,
            rgba(30, 58, 138, 0.1) 100%
        );
    }
}

.banner-content {
    max-width: 800px;
}

.banner-content h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.banner-content p {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

/* 解决方案区域样式 */
.solutions-section {
    padding: 5rem 0;
    background-color: var(--bg-white);
}

.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-header h2 {
    font-size: 2.25rem;
    color: var(--primary-dark);
    margin-bottom: 1rem;
}

.section-header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

.solutions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.solution-card {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid var(--border-color);
}

.solution-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

.card-icon {
    background-color: var(--primary-color);
    color: white;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: -30px auto 1rem;
    font-size: 1.5rem;
    position: relative;
    z-index: 1;
    box-shadow: var(--shadow-md);
}

.card-image {
    height: 200px;
    overflow: hidden;
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.solution-card:hover .card-image img {
    transform: scale(1.05);
}

.card-content {
    padding: 2rem;
}

.card-content h3 {
    font-size: 1.5rem;
    color: var(--primary-dark);
    margin-bottom: 1rem;
}

.card-content p {
    color: var(--text-secondary);
    margin-bottom: 1.2rem;
    line-height: 1.7;
}

/* 卡片高亮标签样式 */
.card-highlights {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.highlight-tag {
    background-color: rgba(30, 58, 138, 0.1);
    color: var(--primary-color);
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
    border: 1px solid rgba(30, 58, 138, 0.2);
    transition: all 0.2s ease;
}

.solution-card:hover .highlight-tag {
    background-color: rgba(30, 58, 138, 0.15);
    border-color: rgba(30, 58, 138, 0.3);
    transform: translateY(-1px);
}

/* 客户案例区域样式 */
.clients-section {
    padding: 5rem 0;
    background-color: var(--bg-light);
    border-top: 1px solid var(--border-color);
}

.clients-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    align-items: center;
    justify-items: center;
    margin-top: 3rem;
}

.client-logo {
    background: white;
    padding: 2rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    transition: transform 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 120px;
    width: 100%;
    max-width: 250px;
}

.client-logo:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.client-logo img {
    max-width: 100%;
    max-height: 60px;
    filter: grayscale(100%);
    opacity: 0.7;
    transition: all 0.3s ease;
}

.client-logo:hover img {
    filter: grayscale(0);
    opacity: 1;
}

/* 页脚样式 */
.footer {
    background-color: var(--primary-dark);
    color: white;
    padding: 4rem 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-section h4 {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    color: white;
}

.footer-logo {
    display: flex;
    align-items: center;
    margin-bottom: 1rem;
    font-size: 1.5rem;
    font-weight: 700;
}

.footer-logo img {
    height: 40px;
    margin-right: 0.75rem;
}

.footer-section p {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.7;
}

.contact-info p {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
}

.contact-info i {
    color: var(--accent-color);
    width: 20px;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.75rem;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 2rem;
    text-align: center;
    color: rgba(255, 255, 255, 0.7);
}

.footer-bottom p {
    margin-bottom: 0.5rem;
}

.footer-bottom a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
}

.footer-bottom a:hover {
    color: var(--accent-color);
    text-decoration: underline;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--bg-white);
        flex-direction: column;
        padding: 1rem;
        box-shadow: var(--shadow-md);
    }

    .nav-menu.active {
        display: flex;
    }

    .nav-actions {
        display: none;
    }

    .hamburger {
        display: block;
    }

    .hero-banner {
        height: 300px;
    }

    .banner-content h1 {
        font-size: 2rem;
    }

    .banner-content p {
        font-size: 1.1rem;
    }

    .solutions-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .clients-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }

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

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }

    .hero-banner {
        height: 250px;
    }

    .banner-content h1 {
        font-size: 1.75rem;
    }

    .clients-grid {
        grid-template-columns: 1fr;
    }

    .client-logo {
        max-width: 200px;
        height: 100px;
    }
}

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

.solution-card {
    animation: fadeIn 0.6s ease-out forwards;
}

.solution-card:nth-child(1) {
    animation-delay: 0.1s;
}

.solution-card:nth-child(2) {
    animation-delay: 0.2s;
}

.solution-card:nth-child(3) {
    animation-delay: 0.3s;
}