/* 全局样式 */
:root {
    --primary: #4361ee;
    --primary-light: #4cc9f0;
    --secondary: #3a0ca3;
    --dark: #212529;
    --light: #f8f9fa;
    --gray: #6c757d;
    --gray-light: #e9ecef;
}

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
    color: var(--dark);
    line-height: 1.7;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6,
.h1, .h2, .h3, .h4, .h5, .h6 {
    font-weight: 700;
    line-height: 1.3;
    color: var(--dark);
}

p {
    color: var(--gray);
    margin-bottom: 1rem;
}

a {
    text-decoration: none;
    transition: all 0.3s ease;
}

.btn {
    font-weight: 500;
    padding: 0.5rem 1.5rem;
    border-radius: 50px;
    transition: all 0.3s ease;
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.5px;
}

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

.btn-primary:hover, .btn-primary:focus {
    background-color: var(--secondary);
    border-color: var(--secondary);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(67, 97, 238, 0.3);
}

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

.btn-outline-primary:hover, .btn-outline-primary:focus {
    background-color: var(--primary);
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(67, 97, 238, 0.3);
}

.btn-lg {
    padding: 0.75rem 2rem;
    font-size: 1rem;
}

/* 导航栏 */
.navbar {
    padding: 1rem 0;
    transition: all 0.3s ease;
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.05);
}

.navbar.scrolled {
    padding: 0.5rem 0;
    background-color: rgba(255, 255, 255, 0.98) !important;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
}

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

.nav-link {
    font-weight: 500;
    padding: 0.5rem 1rem !important;
    color: var(--dark) !important;
    position: relative;
}

.nav-link:after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--primary);
    transition: all 0.3s ease;
}

.nav-link:hover:after, .nav-link.active:after {
    width: 50%;
}

/* 英雄区域 */
.hero-section {
    padding: 8rem 0 5rem;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero-section:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml;base64,PHN2ZyB3aWR0aD0iMTAwJSIgaGVpZ2h0PSIxMDAlIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjxkZWZzPjxwYXR0ZXJuIGlkPSJwYXR0ZXJuIiB3aWR0aD0iNDAiIGhlaWdodD0iNDAiIHBhdHRlcm5Vbml0cz0idXNlclNwYWNlT25Vc2UiIHBhdHRlcm5UcmFuc2Zvcm09InJvdGF0ZSg0NSkiPjxyZWN0IHdpZHRoPSIyMCIgaGVpZ2h0PSIyMCIgZmlsbD0icmdiYSgyNTUsMjU1LDI1NSwwLjA1KSIvPjwvcGF0dGVybj48L2RlZnM+PHJlY3Qgd2lkdGg9IjEwMCUiIGhlaWdodD0iMTAwJSIgZmlsbD0idXJsKCNwYXR0ZXJuKSIvPjwvc3ZnPg==');
    opacity: 0.5;
}

.hero-section h1 {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    line-height: 1.2;
    background: linear-gradient(to right, var(--primary), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-section p.lead {
    font-size: 1.25rem;
    color: var(--gray);
    margin-bottom: 2rem;
}

/* 功能特点 */
.feature-icon {
    width: 70px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(67, 97, 238, 0.1);
    border-radius: 15px;
    margin-bottom: 1.5rem;
}

.card {
    border: none;
    border-radius: 15px;
    transition: all 0.3s ease;
    overflow: hidden;
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1) !important;
}

/* 价格方案 */
.pricing .card {
    transition: all 0.3s ease;
}

.pricing .card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 30px rgba(67, 97, 238, 0.2) !important;
}

.pricing .card.featured {
    border: 2px solid var(--primary);
    position: relative;
    z-index: 1;
}

.pricing .card.featured:before {
    content: '推荐';
    position: absolute;
    top: 0;
    right: 20px;
    background: var(--primary);
    color: white;
    padding: 0.25rem 1rem;
    font-size: 0.8rem;
    border-bottom-left-radius: 5px;
    border-bottom-right-radius: 5px;
}

/* 联系我们 */
.contact-info {
    padding: 2rem;
    background: white;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
    height: 100%;
}

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

.contact-info i {
    font-size: 2rem;
    color: var(--primary);
    margin-bottom: 1rem;
}

/* 页脚 */
footer {
    background-color: var(--dark);
    color: white;
    padding: 5rem 0 2rem;
}

footer a {
    color: rgba(255, 255, 255, 0.7);
    transition: all 0.3s ease;
}

footer a:hover {
    color: white;
    padding-left: 5px;
}

footer h5 {
    color: white;
    margin-bottom: 1.5rem;
    font-weight: 600;
}

footer .social-icons a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    margin-right: 10px;
    transition: all 0.3s ease;
}

footer .social-icons a:hover {
    background: var(--primary);
    transform: translateY(-3px);
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(67, 97, 238, 0.3);
}

.back-to-top.active {
    opacity: 1;
    visibility: visible;
    bottom: 30px;
}

.back-to-top:hover {
    background: var(--secondary);
    color: white;
    transform: translateY(-3px);
}

/* 响应式调整 */
@media (max-width: 991.98px) {
    .hero-section {
        text-align: center;
        padding: 7rem 0 5rem;
    }
    
    .hero-section h1 {
        font-size: 2.5rem;
    }
    
    .hero-section p.lead {
        font-size: 1.1rem;
    }
    
    .navbar-collapse {
        background: white;
        padding: 1rem;
        border-radius: 10px;
        box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    }
    
    .nav-link:after {
        display: none;
    }
}

@media (max-width: 767.98px) {
    .hero-section h1 {
        font-size: 2rem;
    }
    
    section {
        padding: 3rem 0;
    }
    
    .feature-icon {
        margin: 0 auto 1.5rem;
    }
    
    .text-center-mobile {
        text-align: center !important;
    }
}