/* CSS Variables */
:root {
    --primary-color: #333E50;
    --accent-color: #C55A11;
    --white: #FFFFFF;
    --light-bg: #F5F5F5;
    --text-dark: #212A35;
    --text-light: #666666;
    --font-family: '微软雅黑', 'Microsoft YaHei', sans-serif;
    --transition: all 0.3s ease;
}

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    color: var(--primary-color);
    line-height: 1.6;
}

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

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--white);
    z-index: 1000;
    transition: var(--transition);
}

.header.scrolled {
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

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

.logo-text {
    font-size: 24px;
    font-weight: bold;
    color: var(--accent-color);
}

.nav-list {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-link {
    text-decoration: none;
    color: var(--primary-color);
    font-weight: 500;
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--accent-color);
}

/* Hamburger Menu */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--primary-color);
    transition: var(--transition);
}

/* Hero Section */
.hero {
    height: 100vh;
    min-height: 600px;
    background: linear-gradient(135deg, rgba(51, 62, 80, 0.9) 0%, rgba(26, 35, 50, 0.95) 100%),
                url('demo/20240707-国浩中医互联网养生诊疗方案_files/Image_002.png') center/cover no-repeat;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--white);
    padding-top: 70px;
}

.hero-content {
    max-width: 800px;
    padding: 20px;
}

.hero-title {
    font-size: 48px;
    font-weight: bold;
    margin-bottom: 20px;
    line-height: 1.3;
}

.hero-subtitle {
    font-size: 18px;
    margin-bottom: 40px;
    opacity: 0.9;
}

.btn {
    display: inline-block;
    padding: 15px 40px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: bold;
    transition: var(--transition);
}

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

.btn-primary:hover {
    background: #a84a0e;
    transform: translateY(-2px);
}

/* Section Common */
.section-title {
    font-size: 36px;
    text-align: center;
    margin-bottom: 15px;
    color: var(--primary-color);
}

.section-subtitle {
    text-align: center;
    color: var(--text-light);
    margin-bottom: 50px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Services Section */
.services {
    padding: 100px 0;
    background: var(--white);
}

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

.service-card {
    background: var(--light-bg);
    padding: 40px 25px;
    border-radius: 15px;
    text-align: center;
    transition: var(--transition);
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0,0,0,0.1);
}

.service-icon {
    font-size: 50px;
    margin-bottom: 20px;
}

.service-title {
    font-size: 20px;
    color: var(--accent-color);
    margin-bottom: 15px;
}

.service-desc {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.8;
}

/* About Section */
.about {
    padding: 100px 0;
    background: var(--light-bg);
}

.about-vision {
    text-align: center;
    margin-bottom: 60px;
}

.vision-title {
    font-size: 24px;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.vision-slogan {
    font-size: 32px;
    color: var(--accent-color);
    font-weight: bold;
    margin-bottom: 20px;
}

.vision-desc {
    max-width: 800px;
    margin: 0 auto;
    color: var(--text-light);
    line-height: 1.8;
}

.advantages-title, .team-title {
    font-size: 24px;
    text-align: center;
    margin-bottom: 15px;
    color: var(--primary-color);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-bottom: 60px;
}

.advantage-card {
    background: var(--white);
    padding: 30px;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 5px 20px rgba(0,0,0,0.05);
}

.advantage-card h4 {
    color: var(--accent-color);
    font-size: 20px;
    margin-bottom: 15px;
}

.advantage-card p {
    color: var(--text-light);
    font-size: 14px;
    line-height: 1.8;
}

.team-subtitle {
    text-align: center;
    color: var(--text-light);
    margin-bottom: 40px;
}

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

.team-card {
    background: var(--white);
    padding: 30px 20px;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 5px 20px rgba(0,0,0,0.05);
}

.team-avatar {
    width: 80px;
    height: 80px;
    background: var(--accent-color);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    font-weight: bold;
    margin: 0 auto 15px;
}

.team-name {
    font-size: 18px;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.team-position {
    color: var(--accent-color);
    font-size: 14px;
    margin-bottom: 10px;
}

.team-desc {
    font-size: 12px;
    color: var(--text-light);
    line-height: 1.6;
}

/* Experts Section */
.experts {
    padding: 100px 0;
    background: var(--white);
}

.experts-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 25px;
}

.expert-card {
    background: var(--light-bg);
    padding: 25px 15px;
    border-radius: 15px;
    text-align: center;
    transition: var(--transition);
}

.expert-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.expert-avatar {
    width: 70px;
    height: 70px;
    background: var(--primary-color);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: bold;
    margin: 0 auto 12px;
}

.expert-name {
    font-size: 16px;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.expert-title {
    color: var(--accent-color);
    font-size: 13px;
    margin-bottom: 8px;
}

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

/* Contact Section */
.contact {
    padding: 100px 0;
    background: var(--light-bg);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    margin-bottom: 30px;
}

.contact-icon {
    font-size: 30px;
}

.contact-item h4 {
    color: var(--primary-color);
    margin-bottom: 5px;
}

.contact-item p {
    color: var(--text-light);
}

.contact-form-placeholder {
    background: var(--white);
    padding: 60px;
    border-radius: 15px;
    text-align: center;
    color: var(--text-light);
    box-shadow: 0 5px 20px rgba(0,0,0,0.05);
}

/* Footer */
.footer {
    background: var(--primary-color);
    color: var(--white);
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 50px;
    margin-bottom: 40px;
}

.footer-brand h3 {
    font-size: 24px;
    color: var(--accent-color);
    margin-bottom: 10px;
}

.footer-brand p {
    opacity: 0.8;
}

.footer-links h4, .footer-contact h4 {
    font-size: 16px;
    margin-bottom: 20px;
}

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

.footer-links li {
    margin-bottom: 10px;
}

.footer-links a {
    color: var(--white);
    text-decoration: none;
    opacity: 0.8;
    transition: var(--transition);
}

.footer-links a:hover {
    opacity: 1;
    color: var(--accent-color);
}

.footer-contact p {
    opacity: 0.8;
    margin-bottom: 8px;
    font-size: 14px;
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 20px;
    text-align: center;
    font-size: 14px;
    opacity: 0.7;
}

.footer-bottom p {
    margin-bottom: 5px;
}

.beian-info {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 5px;
}

.beian-info a {
    color: var(--white);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    transition: var(--transition);
}

.beian-info a:hover {
    opacity: 1;
    color: var(--accent-color);
}

.beian-icon {
    width: 16px;
    height: 16px;
    vertical-align: middle;
}

.beian-divider {
    margin: 0 10px;
    opacity: 0.5;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .team-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .experts-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .footer-content {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .nav {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--white);
        padding: 20px;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
        box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    }
    
    .nav.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-list {
        flex-direction: column;
        gap: 15px;
    }
    
    .hamburger {
        display: flex;
    }
    
    .hero-title {
        font-size: 32px;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .services-grid,
    .advantages-grid,
    .team-grid {
        grid-template-columns: 1fr;
    }
    
    .experts-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 26px;
    }
    
    .experts-grid {
        grid-template-columns: 1fr;
    }
    
    .vision-slogan {
        font-size: 24px;
    }
}


/* Animation Classes */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Active nav link */
.nav-link.active {
    color: var(--accent-color);
}

/* Hamburger animation */
.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}