/* 重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
}

/* CSS变量（全局配色、字体等） */
:root {
    --primary: #6a5acd;
    --secondary: #9370db;
    --accent: #ba55d3;
    --light: #f8f9fa;
    --dark: #212529;
    --success: #4bb543;
    --bilibili: #FB7299;
}

/* 全局body样式 */
body {
    background: linear-gradient(135deg, #f5f7fa 0%, #e6e6fa 100%);
    color: var(--dark);
    line-height: 1.6;
}

/* 通用容器（页面居中、响应式宽度） */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 通用标题样式 */
h1 {
    font-size: 2.8rem;
    margin-bottom: 30px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    line-height: 1.2;
}

h2 {
    font-size: 2.8rem;
    color: var(--dark);
    margin-bottom: 20px;
}

/* 通用按钮样式 */
.btn {
    padding: 15px 35px;
    font-size: 18px;
    border-radius: 30px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
}

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

.btn-primary:hover {
    background: var(--secondary);
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

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

.btn-secondary:hover {
    background: rgba(106, 90, 205, 0.1);
    transform: translateY(-3px);
}

/* 导航栏样式（全局通用组件） */
header {
    background-color: rgba(255, 255, 255, 0.95);
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
}

.logo {
    display: flex;
    align-items: center;
    font-size: 24px;
    font-weight: 700;
    color: var(--primary);
    cursor: pointer;
}

.logo i {
    margin-right: 10px;
    color: var(--accent);
}

.nav-links {
    display: flex;
    gap: 30px;
}

.nav-links a {
    text-decoration: none;
    color: var(--dark);
    font-weight: 500;
    transition: color 0.3s;
}

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

/* 通用区块标题样式（所有section共用） */
.section-title {
    text-align: center;
    margin-bottom: 80px;
}

.section-title p {
    font-size: 1.3rem;
    color: #666;
    max-width: 700px;
    margin: 0 auto;
}
/* ================================= 轮播通用基础样式（放global.css） ================================= */
/* 容器通用样式（和其他模块保持一致） */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 按钮通用样式（轮播左右箭头复用） */
.carousel-btn {
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}

/* 指示器通用样式（小圆点基础样式） */
.indicator-dot {
    cursor: pointer;
    transition: all 0.3s ease;
    border-radius: 50%;
}

/* 轮播响应式基础规则（适配手机/平板） */
@media (max-width: 992px) {
    .carousel-title h2 {
        font-size: 1.8rem;
    }
    .photo-overlay {
        padding: 30px 20px;
    }
    .photo-overlay h3 {
        font-size: 1.5rem;
    }
    .photo-overlay p {
        font-size: 1rem;
    }
}

@media (max-width: 768px) {
    .carousel-title {
        margin-bottom: 40px;
    }
    .carousel-title h2 {
        font-size: 1.5rem;
    }
    .carousel-title p {
        font-size: 1rem;
    }
    .carousel-btn {
        width: 40px;
        height: 40px;
        font-size: 1.2rem;
    }
}
/* 六大课程子页面 - 顶部返回导航（全局复用） */
.sub-course-nav {
    background-color: rgba(255, 255, 255, 0.95);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    padding: 15px 0;
    margin-bottom: 20px;
}

.sub-nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.back-btn {
    color: #6a5acd;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
}

.page-title-small {
    color: #2d3e50;
    font-size: 1.2rem;
    margin: 0;
}

/* 六大课程子页面 - 主体容器（全局复用） */
.sub-course-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 课程大标题样式 */
.sub-course-title {
    text-align: center;
    color: #2d3e50;
    margin-bottom: 20px;
}
/* 全局通用样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Microsoft Yahei", sans-serif;
}

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

/* 导航栏样式（和主页一致） */
header {
    background-color: rgba(255, 255, 255, 0.95);
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}

.logo {
    display: flex;
    align-items: center;
    font-size: 24px;
    font-weight: 700;
    color: #6a5acd;
    text-decoration: none;
}

.logo i {
    color: #ba55d3;
    margin-right: 8px;
}

.nav-links {
    display: flex;
    gap: 30px;
}

.nav-links a {
    text-decoration: none;
    color: #212529;
    font-weight: 500;
}

.nav-links a:hover {
    color: #6a5acd;
}

/* 六大课程子页面 - 顶部返回导航 */
.sub-course-nav {
    background-color: rgba(255, 255, 255, 0.95);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    padding: 15px 0;
    margin-bottom: 20px;
}

.sub-nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.back-btn {
    color: #6a5acd;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
}

.page-title-small {
    color: #2d3e50;
    font-size: 1.2rem;
    margin: 0;
}

/* 六大课程子页面 - 主体容器 */
.sub-course-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 课程大标题样式 */
.sub-course-title {
    text-align: center;
    color: #2d3e50;
    margin-bottom: 20px;
}

/* 页脚样式 */
footer {
    background-color: #f8f9fa;
    padding: 30px 0;
    margin-top: 50px;
}

.copyright {
    text-align: center;
    color: #666;
    font-size: 0.9rem;
}