/* 全局样式 */
:root {
    --primary-color: #0369a1;
    --secondary-color: #0284c7;
    --dark-color: #1f2937;
    --light-color: #f3f4f6;
    --text-color: #4b5563;
}

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    padding-top: 76px;
}

/* 导航栏样式 */
.navbar {
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.navbar-brand {
    font-weight: 600;
    font-size: 1.2rem;
}

.nav-link {
    font-weight: 500;
    padding: 0.5rem 1rem !important;
    transition: color 0.3s ease;
}

.nav-link:hover, .nav-link.active {
    color: var(--secondary-color) !important;
}

/* 页面头部样式 */
.page-header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    padding: 4rem 0;
    margin-bottom: 3rem;
}

.page-header h1 {
    font-weight: 700;
    margin-bottom: 1rem;
}

.breadcrumb {
    background: transparent;
    padding: 0;
}

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

.breadcrumb-item a:hover {
    color: #fff;
}

.breadcrumb-item.active {
    color: #fff;
}

/* 卡片样式 */
.card {
    border: none;
    border-radius: 15px;
    overflow: hidden;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
}

.card-img-top {
    height: 200px;
    object-fit: cover;
}

/* 按钮样式 */
.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border: none;
    padding: 0.5rem 1.5rem;
    border-radius: 30px;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(3, 105, 161, 0.3);
}

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

.footer h4 {
    color: #fff;
    margin-bottom: 1.5rem;
    font-weight: 600;
}

.footer p {
    color: rgba(255,255,255,0.8);
    margin-bottom: 0.5rem;
}

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

.footer a:hover {
    color: #fff;
}

.footer .list-unstyled li {
    margin-bottom: 0.5rem;
}

/* 动画效果 */
.fade-up {
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.6s ease;
}

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

/* 响应式调整 */
@media (max-width: 768px) {
    .page-header {
        padding: 3rem 0;
    }
    
    .card-img-top {
        height: 180px;
    }
    
    .footer {
        padding: 3rem 0 1.5rem;
    }
}

/* 工具类 */
.text-gradient {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.bg-gradient {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

/* 图片样式 */
.img-fluid {
    max-width: 100%;
    height: auto;
    border-radius: 10px;
}

/* 图标样式 */
.icon-box {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.icon-box i {
    font-size: 1.5rem;
    color: #fff;
}

/* 标题样式 */
.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 3rem;
    text-align: center;
    position: relative;
    padding-bottom: 15px;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 3px;
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
}

/* 列表样式 */
.list-unstyled {
    list-style: none;
    padding: 0;
    margin: 0;
}

/* 间距工具类 */
.mt-5 { margin-top: 3rem !important; }
.mb-5 { margin-bottom: 3rem !important; }
.py-5 { padding-top: 3rem !important; padding-bottom: 3rem !important; }