:root {
    /* 专业商务色调 - 深蓝灰与活力蓝色的搭配 */
    --primary-color: #2563eb;
    /* 专业蓝色 */
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    /* 中性灰蓝 */
    --secondary-hover: #475569;
    /* 强调色 */
    --accent-color: #06b6d4;
    /* 青色 */
    --accent-hover: #0891b2;
    --success-color: #10b981;
    /* 绿色 */
    --warning-color: #f59e0b;
    /* 琥珀色 */
    --error-color: #ef4444;
    /* 红色 */
    /* 中性色 - 专业灰色调 */
    --dark-color: #1e293b;
    --text-color: #334155;
    --light-text: #64748b;
    --background-light: #f8fafc;
    --background-gray: #f1f5f9;
    --white: #ffffff;
    /* 渐变定义 */
    --gradient-primary: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    --gradient-secondary: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
    --gradient-mix: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    --gradient-hero: linear-gradient(135deg, #2563eb 0%, #06b6d4 100%);
    --gradient-card: linear-gradient(135deg, var(--white) 0%, var(--background-light) 100%);
    /* 阴影 */
    --shadow-sm: 0 2px 8px rgba(37, 99, 235, 0.08);
    --shadow-md: 0 4px 20px rgba(37, 99, 235, 0.12);
    --shadow-lg: 0 8px 30px rgba(37, 99, 235, 0.15);
    /* 圆角 */
    --radius-sm: 0.375rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.25rem;
    /* 过渡效果 */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    background: var(--background-light);
    font-family: 'Inter', 'SF Pro Display', -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
}

a {
    text-decoration: none;
    transition: var(--transition);
    color: var(--text-color);
}

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

button {
    border: none;
    cursor: pointer;
    font-family: inherit;
    font-weight: 600;
    outline: none;
    transition: var(--transition);
}

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

.container {
    margin: 0 auto;
    max-width: 1200px;
    padding: 0 1.5rem;
    width: 100%;
}

.section {
    padding: 5rem 0;
}

.section-title {
    color: var(--dark-color);
    font-size: 2.75rem;
    font-weight: 700;
    margin-bottom: 1rem;
    position: relative;
    text-align: center;
}

.section-title:after {
    background: var(--gradient-primary);
    border-radius: var(--radius-sm);
    bottom: -12px;
    content: "";
    height: 4px;
    left: 50%;
    position: absolute;
    transform: translateX(-50%);
    width: 100px;
}

.section-subtitle {
    color: var(--light-text);
    font-size: 1.125rem;
    text-align: center;
    max-width: 600px;
    margin: 2rem auto 3rem;
    line-height: 1.7;
}


/* 按钮样式 - 专业商务设计 */

.btn {
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-size: 1rem;
    font-weight: 600;
    padding: 1rem 2.5rem;
    text-align: center;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--white);
    box-shadow: 0 4px 15px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover {
    box-shadow: 0 6px 25px rgba(37, 99, 235, 0.4);
    transform: translateY(-2px);
}

.btn-secondary {
    background: var(--white);
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

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

.btn-accent {
    background: var(--accent-color);
    color: var(--white);
    box-shadow: 0 4px 15px rgba(6, 182, 212, 0.3);
}

.btn-accent:hover {
    background: var(--accent-hover);
    box-shadow: 0 6px 25px rgba(6, 182, 212, 0.4);
    transform: translateY(-2px);
}


/* 卡片样式 */

.card {
    background: var(--white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: var(--transition);
    border: 1px solid var(--background-gray);
}

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

.card-header {
    padding: 2rem 2rem 1rem;
    border-bottom: 1px solid var(--background-gray);
}

.card-body {
    padding: 1.5rem 2rem;
}

.card-footer {
    padding: 1rem 2rem 2rem;
    border-top: 1px solid var(--background-gray);
}


/* 导航栏样式 */

.navbar {
    background: var(--white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--primary-color);
}

.navbar-nav a {
    color: var(--text-color);
    font-weight: 500;
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.navbar-nav a:hover,
.navbar-nav a.active {
    color: var(--primary-color);
    background: rgba(37, 99, 235, 0.05);
}


/* 英雄区域样式 */

.hero {
    background: var(--gradient-hero);
    color: var(--white);
    padding: 8rem 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero: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='0.1'%3E%3Ccircle cx='30' cy='30' r='4'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    line-height: 1.2;
    position: relative;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 2.5rem;
    opacity: 0.9;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    font-weight: 300;
    position: relative;
}


/* 服务概览区域 */

.services-overview {
    background: var(--white);
    padding: 4rem 0;
}

.service-item {
    text-align: center;
    padding: 2rem;
    border-radius: var(--radius-lg);
    transition: var(--transition);
    background: var(--background-light);
    border: 1px solid transparent;
}

.service-item:hover {
    background: var(--white);
    border-color: var(--primary-color);
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.service-item h3 {
    color: var(--primary-color);
    font-size: 1.5rem;
    margin-bottom: 1rem;
    font-weight: 600;
}

.service-item ul li {
    padding: 0.5rem 0;
    color: var(--text-color);
    position: relative;
}


/* 价格卡片样式 */

.pricing-card {
    background: var(--white);
    border-radius: var(--radius-xl);
    padding: 2.5rem;
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    position: relative;
    border: 2px solid transparent;
}

.pricing-card:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
}

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

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

.pricing-card.featured:before {
    height: 6px;
    background: var(--gradient-mix);
}

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

.pricing-header {
    margin-bottom: 2rem;
}

.pricing-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--dark-color);
    margin-bottom: 1rem;
}

.pricing-price {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    line-height: 1;
}

.pricing-period {
    color: var(--light-text);
    font-size: 0.875rem;
}

.pricing-features {
    margin: 2rem 0;
    text-align: left;
}

.pricing-features li {
    padding: 0.75rem 0;
    color: var(--text-color);
    position: relative;
    padding-left: 2rem;
    border-bottom: 1px solid var(--background-gray);
}

.pricing-features li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--success-color);
    font-weight: bold;
    background: rgba(16, 185, 129, 0.1);
    width: 1.5rem;
    height: 1.5rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.pricing-features li:last-child {
    border-bottom: none;
}


/* 成功案例样式 */

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

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

.case-img {
    height: 200px;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 3rem;
}

.case-content {
    padding: 1.5rem;
}

.case-content h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--dark-color);
    margin-bottom: 0.5rem;
}

.case-content p {
    color: var(--light-text);
    line-height: 1.6;
}


/* 联系区域样式 */

.contact-section {
    background: var(--gradient-hero);
    color: var(--white);
    text-align: center;
}

.contact-section .section-title {
    color: var(--white);
}

.contact-section .section-title:after {
    background: var(--white);
}

.contact-section .section-subtitle {
    color: rgba(255, 255, 255, 0.8);
}

.contact-info {
    margin: 2rem 0;
}

.contact-info p {
    margin-bottom: 1rem;
    opacity: 0.9;
}


/* 页脚样式 */

.footer {
    background: var(--dark-color);
    color: var(--white);
    padding: 3rem 0 1rem;
}

.footer p {
    opacity: 0.8;
    margin-bottom: 1rem;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin: 2rem 0;
}

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

.social-links a:hover {
    background: var(--primary-color);
    transform: translateY(-2px);
}


/* 响应式设计 */

@media (max-width: 768px) {
    .section {
        padding: 4rem 0;
    }
    .section-title {
        font-size: 2.25rem;
    }
    .hero-title {
        font-size: 2.75rem;
    }
    .hero-subtitle {
        font-size: 1.125rem;
    }
    .pricing-card.featured {
        transform: none;
    }
    .pricing-card.featured:hover {
        transform: translateY(-8px);
    }
}

@media (max-width: 480px) {
    .section {
        padding: 3rem 0;
    }
    .section-title {
        font-size: 2rem;
    }
    .btn {
        font-size: 0.875rem;
        padding: 0.875rem 2rem;
    }
    .hero {
        padding: 6rem 0;
    }
    .hero-title {
        font-size: 2.25rem;
    }
    .hero-subtitle {
        font-size: 1rem;
    }
    .pricing-card {
        padding: 2rem 1.5rem;
    }
}


/* 动画效果 */

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

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}


/* 滚动条样式 */

::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--background-gray);
}

::-webkit-scrollbar-thumb {
    background: var(--gradient-primary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-hover);
}


/* 标签样式 */

.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-lg);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

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

.badge-secondary {
    background: var(--gradient-secondary);
    color: var(--white);
}

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