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

:root {
    /* 主色调 - 现代蓝色系 */
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --primary-gradient: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
    
    /* 辅助色 */
    --secondary-color: #7c3aed;
    --accent-color: #06b6d4;
    
    /* 中性色 */
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    
    /* 语义色 */
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    
    /* 间距 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* 圆角 */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* 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);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: var(--gray-800);
    background-color: #fff;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    padding: var(--spacing-sm) 0;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-img {
    width: 40px;
    height: 40px;
    object-fit: contain;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-decoration: none;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
}

.nav-menu a {
    text-decoration: none;
    color: var(--gray-700);
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

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

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-gradient);
    transition: width 0.3s ease;
}

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

/* Hero 区域 */
.hero {
    margin-top: 80px;
    padding: var(--spacing-2xl) 0;
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 50%, #dbeafe 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(37, 99, 235, 0.1) 0%, transparent 70%);
    border-radius: 50%;
}

.hero-content {
    text-align: center;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: var(--spacing-md);
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--gray-600);
    margin-bottom: var(--spacing-xl);
    font-weight: 500;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 1rem 2.5rem;
    border-radius: var(--radius-full);
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    cursor: pointer;
    border: 2px solid transparent;
}

.btn-primary {
    background: var(--primary-gradient);
    color: #fff;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-outline:hover {
    background: var(--primary-color);
    color: #fff;
}

/* 通用区域样式 */
section {
    padding: var(--spacing-2xl) 0;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-2xl);
    color: var(--gray-900);
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: var(--primary-gradient);
    border-radius: var(--radius-full);
}

/* 核心优势 */
.advantages {
    background: linear-gradient(180deg, #fff 0%, #f8fafc 100%);
    padding: var(--spacing-2xl) 0;
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
    margin-top: var(--spacing-2xl);
}

.advantage-card {
    background: #fff;
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    border: 1px solid transparent;
}

.advantage-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--primary-gradient);
    transform: scaleX(0);
    transition: transform 0.4s ease;
}

.advantage-card:hover {
    transform: translateY(-12px);
    box-shadow: 0 20px 40px rgba(37, 99, 235, 0.15);
    border-color: rgba(37, 99, 235, 0.2);
}

.advantage-card:hover::before {
    transform: scaleX(1);
}

.advantage-number {
    font-size: 3.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.1) 0%, rgba(124, 58, 237, 0.1) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    margin-bottom: var(--spacing-md);
}

.advantage-card h3 {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--gray-900);
    position: relative;
}

.advantage-card p {
    color: var(--gray-600);
    line-height: 1.8;
    font-size: 0.95rem;
}

.advantage-line {
    width: 40px;
    height: 3px;
    background: var(--primary-gradient);
    margin-top: var(--spacing-lg);
    border-radius: var(--radius-full);
}

/* 核心功能模块 */
.features {
    background: #fff;
    padding: var(--spacing-2xl) 0;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin-top: var(--spacing-2xl);
}

.feature-card {
    background: linear-gradient(145deg, #ffffff 0%, #f8fafc 100%);
    padding: var(--spacing-xl);
    border-radius: var(--radius-2xl);
    border: 1px solid var(--gray-200);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.feature-card::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 100px;
    height: 100px;
    background: radial-gradient(circle, rgba(37, 99, 235, 0.05) 0%, transparent 70%);
    border-radius: 50%;
    transform: translate(30%, -30%);
    transition: all 0.4s ease;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.1);
    border-color: var(--primary-color);
}

.feature-card:hover::after {
    transform: translate(50%, -50%) scale(1.5);
}

.feature-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-sm);
    gap: var(--spacing-sm);
}

.feature-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
    margin: 0;
}

.feature-tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.1) 0%, rgba(124, 58, 237, 0.1) 100%);
    color: var(--primary-color);
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    font-weight: 600;
    white-space: nowrap;
}

.feature-subtitle {
    font-size: 1rem;
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--gray-200);
}

.feature-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.feature-list li {
    padding: 0.6rem 0;
    color: var(--gray-700);
    font-size: 0.95rem;
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    border-bottom: 1px solid rgba(229, 231, 235, 0.5);
}

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

.check-icon {
    color: var(--success);
    font-weight: 700;
    font-size: 1rem;
    flex-shrink: 0;
    margin-top: 2px;
}

/* 产品套餐 */
.pricing {
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.pricing-card {
    background: #fff;
    border-radius: var(--radius-2xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    transition: all 0.3s ease;
    border: 2px solid var(--gray-200);
}

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

.pricing-card.featured {
    border-color: var(--primary-color);
    transform: scale(1.05);
}

.pricing-card.featured:hover {
    transform: scale(1.05) translateY(-8px);
}

.pricing-header {
    background: var(--primary-gradient);
    color: #fff;
    padding: var(--spacing-xl);
    text-align: center;
}

.pricing-header h3 {
    font-size: 1.8rem;
    margin-bottom: var(--spacing-sm);
}

.price {
    font-size: 3rem;
    font-weight: 800;
}

.price span {
    font-size: 1rem;
    font-weight: 400;
    opacity: 0.9;
}

.pricing-body {
    padding: var(--spacing-xl);
}

.pricing-body ul {
    list-style: none;
}

.pricing-body ul li {
    padding: var(--spacing-xs) 0;
    color: var(--gray-700);
}

.pricing-footer {
    padding: var(--spacing-xl);
    text-align: center;
    background: var(--gray-50);
}

.suitable {
    color: var(--gray-600);
    margin-bottom: var(--spacing-md);
    font-size: 0.9rem;
}

/* 联系我们 */
.contact {
    background: linear-gradient(180deg, #f8fafc 0%, #fff 100%);
    padding: var(--spacing-2xl) 0;
}

.contact-info-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
    margin-top: var(--spacing-2xl);
}

.contact-card {
    background: #fff;
    padding: var(--spacing-lg);
    border-radius: var(--radius-xl);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
    border: 1px solid transparent;
}

.contact-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 15px 35px rgba(37, 99, 235, 0.12);
    border-color: rgba(37, 99, 235, 0.2);
}

.contact-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-lg);
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.1) 0%, rgba(124, 58, 237, 0.1) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    position: relative;
}

.contact-icon::before {
    content: '';
    position: absolute;
    width: 24px;
    height: 24px;
    border: 3px solid var(--primary-color);
    border-radius: 50%;
}

.contact-icon::after {
    content: '';
    position: absolute;
    width: 8px;
    height: 8px;
    background: var(--primary-color);
    border-radius: 50%;
}

.icon-building::before {
    width: 20px;
    height: 16px;
    border: none;
    background: var(--primary-color);
    border-radius: 3px;
}

.icon-building::after {
    display: none;
}

.icon-phone::before {
    width: 18px;
    height: 18px;
    border: none;
    background: transparent;
}

.icon-phone::after {
    width: 18px;
    height: 18px;
    background: transparent;
    border: 3px solid var(--primary-color);
    border-radius: 50%;
}

.icon-email::before {
    width: 22px;
    height: 16px;
    border: none;
    background: var(--primary-color);
    border-radius: 2px;
}

.icon-email::after {
    display: none;
}

.icon-location::before {
    width: 16px;
    height: 20px;
    border: none;
    background: transparent;
}

.icon-location::after {
    width: 16px;
    height: 20px;
    background: transparent;
    border: 3px solid var(--primary-color);
    border-radius: 50% 50% 50% 0;
    transform: rotate(-45deg);
}

.icon-clock::before {
    width: 20px;
    height: 20px;
    border: none;
    background: transparent;
}

.icon-clock::after {
    width: 20px;
    height: 20px;
    background: transparent;
    border: 3px solid var(--primary-color);
    border-radius: 50%;
}

.contact-details h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--gray-500);
    margin-bottom: 0.4rem;
}

.contact-details p {
    font-size: 1.1rem;
    color: var(--gray-900);
    font-weight: 600;
    line-height: 1.5;
}

/* 页脚 */
.footer {
    background: var(--gray-900);
    color: #fff;
    padding: var(--spacing-xl) 0;
    text-align: center;
}

.footer p {
    margin-bottom: var(--spacing-sm);
    opacity: 0.9;
}

/* 响应式设计 - 平板 */
@media (max-width: 1024px) {
    .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .contact-info-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* 响应式设计 - 手机 */
@media (max-width: 768px) {
    .nav-menu {
        gap: var(--spacing-sm);
        font-size: 0.9rem;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.2rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .advantages-grid,
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .advantage-card {
        padding: var(--spacing-lg);
    }
    
    .advantage-number {
        font-size: 2.5rem;
    }
    
    .feature-card {
        padding: var(--spacing-lg);
    }
    
    .feature-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .pricing-grid {
        grid-template-columns: 1fr;
    }
    
    .pricing-card.featured {
        transform: none;
    }
    
    /* 联系我们响应式 */
    .contact-info-grid {
        grid-template-columns: 1fr;
    }
}

/* 平滑滚动 */
html {
    scroll-behavior: smooth;
}

/* 动画效果 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.advantage-card,
.feature-card,
.pricing-card {
    animation: fadeInUp 0.6s ease-out;
}