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

/* 隐藏可能的进度条效果 */
::-webkit-progress-bar {
    display: none;
}

progress {
    display: none;
}

/* 防止任何闪烁效果 */
* {
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
}

html {
    width: 100%;
    height: 100%;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Helvetica Neue', Arial, sans-serif;
    font-size: 16px;
    line-height: 1.4;
    background: white;
    color: #000;
    letter-spacing: -0.01em;
    width: 100%;
    min-height: 100vh;
}

a {
    text-decoration: none;
    color: inherit;
}

/* 主布局 */
.container {
    width: 100%;
    padding: 0 40px;
}

/* 顶部导航 */
.header {
    overflow-x: auto;
    white-space: nowrap;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
}

.nav {
    display: flex;
    gap: 25px;
}

/* 统一所有导航链接的样式 */
.nav a,
.nav a.nav-link,
.nav a.nav-subdued {
    font-size: 15px !important;
    font-weight: 400 !important;
    transition: opacity 0.3s ease !important;
    cursor: pointer !important;
    white-space: nowrap !important;
    position: relative !important;
    top: 0 !important;
    left: 0 !important;
    margin: 0 !important;
    padding: 0 !important;
    box-sizing: border-box !important;
    transform: none !important;
    display: inline-flex;
    align-items: center !important;
    justify-content: center !important;
    height: 20px !important;
    line-height: 20px !important;
}

/* 统一所有导航链接的悬停效果 */
.nav a:hover,
.nav a.nav-link:hover,
.nav a.nav-subdued:hover {
    opacity: 0.6 !important;
}

/* 统一所有导航链接的激活状态 */
.nav a.active,
.nav a.nav-link.active,
.nav a.nav-subdued.active,
.nav a[data-page="home"].active,
.nav a[data-page="tools"].active,
.nav a[data-page="tutorials"].active,
.nav a[data-page="ai"].active,
.nav a[data-page="artists"].active,
.nav a[data-page="about"].active,
.nav a[data-page="paid-courses"].active,
.nav a[data-page="brain-research"].active {
    opacity: 0.6 !important;
    position: relative !important;
    top: 0 !important;
    left: 0 !important;
    margin: 0 !important;
    padding: 0 !important;
    box-sizing: border-box !important;
    transform: none !important;
    display: inline-flex;
    align-items: center !important;
    justify-content: center !important;
    height: 20px !important;
    line-height: 20px !important;
}

/* 统一所有减弱状态的导航链接 */
.nav a.nav-subdued {
    opacity: 0.4 !important;
}

/* 强制重置任何可能的内联样式 */
a[class*="nav-"][data-page],
a[data-page="about"],
a[data-page="brain-research"] {
    position: relative !important;
    top: 0 !important;
    left: 0 !important;
    margin: 0 !important;
    padding: 0 !important;
    box-sizing: border-box !important;
    transform: none !important;
    transition: none !important;
}

#paid-courses-link,
#brain-research-link {
    display: none;
    opacity: 0;
}

.toggle-switch {
    background-color: #e0e0e0;
}

.toggle-switch.active {
    background-color: #007bff;
}

.toggle-circle {
    transform: translateX(0);
}

.toggle-switch.active .toggle-circle {
    transform: translateX(20px);
}

.nav-controls {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-left: 0;
}

/* 切换开关 */
.toggle-switch {
    width: 40px;
    height: 20px;
    background: #e0e0e0;
    border-radius: 20px;
    position: relative;
    cursor: pointer;
    transition: background 0.3s ease;
}

.toggle-switch.active {
    background: #5a7c8a;
}

.toggle-circle {
    width: 16px;
    height: 16px;
    background: white;
    border-radius: 50%;
    position: absolute;
    top: 2px;
    right: 2px;
    transition: transform 0.3s ease;
}

.toggle-switch.active .toggle-circle {
    transform: translateX(-20px);
}

.control-dot {
    width: 8px;
    height: 8px;
    background: #000;
    border-radius: 50%;
}

/* 主要内容区域 */
.main-content {
    min-height: 100vh;
    padding-top: 100px;
}

/* 页面内容 - 统一所有页面的容器样式 */
.page-content {
    /* display: none;  Removed for multi-page */
    margin: 60px auto 50px auto;
    /* 统一顶部、底部边距 */
    padding: 0 20px;
    /* 统一左右内边距 */
    max-width: 1200px;
    /* 统一最大宽度 */
    width: 100%;
    /* 确保占满可用空间 */
    box-sizing: border-box;
    /* 确保内边距计算正确 */
}

/* .page-content.active {
    display: block;
} Removed for multi-page */

/* 确保所有页面内容的第一元素对齐 */
.page-content>*:first-child {
    margin-top: 0 !important;
    padding-top: 0 !important;
}

/* AI页面样式 */
.ai-content {
    max-width: 1000px;
    margin: 0 auto;
}

.ai-section {
    margin-bottom: 60px;
}

.ai-title {
    font-size: 32px;
    font-weight: 500;
    margin-bottom: 30px;
    text-align: center;
}

.ai-description {
    font-size: 18px;
    line-height: 1.8;
    margin-bottom: 40px;
    text-align: center;
    color: #666;
}

.ai-categories {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 60px;
}

.ai-category {
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    padding: 40px;
    transition: all 0.3s ease;
}

.ai-category:hover {
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
    transform: translateY(-3px);
}

.ai-category h3 {
    font-size: 24px;
    font-weight: 500;
    margin-bottom: 20px;
    color: #3a5a6b;
}

.ai-category p {
    font-size: 16px;
    line-height: 1.6;
    color: #666;
    margin-bottom: 20px;
}

.ai-category-link {
    display: inline-block;
    padding: 10px 20px;
    background: #5a7c8a;
    color: white;
    border-radius: 4px;
    transition: all 0.3s ease;
    text-decoration: none;
}

.ai-category-link:hover {
    background: #3a5a6b;
    transform: translateX(5px);
}

/* 首页样式 */
.hero-page {
    height: 100vh;
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    text-align: center;
    /* 抵消 page-content 的 margin，让内容更靠上，与其他页面的 hero-dot 对齐 */
    margin-top: -60px;
    padding-top: 60px;
}

.hero-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    z-index: 1;
    width: 100%;
}

.hero-title {
    font-size: clamp(60px, 12vw, 160px);
    font-weight: 300;
    letter-spacing: -0.02em;
    line-height: 1;
    margin: 0 0 10px 0;
    white-space: nowrap;
    color: #000;
}

.hero-subtitle {
    font-size: 24px;
    font-weight: 300;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: #666;
    margin-bottom: 60px;
}

.hero-description {
    max-width: 600px;
    margin: 0 auto;
    opacity: 0;
    animation: fadeIn 1s ease 0.5s forwards;
}

.hero-description p {
    font-size: 18px;
    line-height: 1.8;
    color: #444;
    margin-bottom: 20px;
    font-weight: 300;
}

.hero-tags {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin: 30px 0;
}

.hero-tag {
    padding: 8px 20px;
    background: #f5f5f5;
    border-radius: 20px;
    font-size: 14px;
    color: #666;
    letter-spacing: 0.05em;
}

.hero-text {
    font-size: 16px !important;
    color: #888 !important;
    margin-top: 40px !important;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}


.scroll-indicator {
    position: absolute;
    bottom: 60px;
    /* 箭头位置：可以调整这个值来改变箭头的垂直位置 */
    left: 50%;
    transform: translateX(-50%);
    /* 水平居中 */
    display: flex;
    flex-direction: column;
    align-items: center;
    animation: bounce 2s infinite;
    /* 弹跳动画：2秒循环，可以调整时长 */
}

.scroll-indicator span {
    font-size: 28px;
    letter-spacing: 0.1em;
}

.scroll-arrow {
    width: 24px;
    /* 箭头宽度：可以调整这个值来改变箭头大小 */
    height: 24px;
    /* 箭头高度：可以调整这个值来改变箭头大小 */
    border-right: 2px solid #333;
    /* 右边框：形成箭头形状 */
    border-bottom: 2px solid #333;
    /* 下边框：形成箭头形状 */
    transform: rotate(45deg);
    /* 旋转45度：让边框形成向下箭头 */
    margin-bottom: 8px;
    /* 下边距：箭头与文字的距离 */
}


@keyframes bounce {

    0%,
    20%,
    50%,
    80%,
    100% {
        transform: translateX(-50%) translateY(0);
    }

    40% {
        transform: translateX(-50%) translateY(-10px);
    }

    60% {
        transform: translateX(-50%) translateY(-5px);
    }
}

.intro-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.intro-content {
    max-width: 600px;
    margin: 0 auto;
}

.intro-description {
    font-size: clamp(18px, 4vw, 26px);
    /* 字体大小：可以调整clamp()中的三个数值来改变字体大小 */
    line-height: 1.8;
    /* 行高：可以调整这个数值来改变行间距，1.8表示行高是字体大小的1.8倍 */
    margin-bottom: 60px;
    /* 下边距：可以调整这个数值来改变与下方元素的距离 */
    font-weight: 300;
    /* 字体粗细：可以改为400(正常)或700(粗体) */
    text-align: center;
    /* 居中对齐：可以改为left(左对齐)或right(右对齐) */
    letter-spacing: 0.5px;
    /* 字母间距：可以调整这个数值来改变字母之间的间距 */
    word-spacing: 2px;
    /* 单词间距：可以调整这个数值来改变单词之间的间距 */
}

.intro-dot {
    width: 8px;
    height: 8px;
    background: #000;
    border-radius: 50%;
    margin: 0 auto;
}

.welcome-symbol {
    text-align: center;
    padding: 20px 0;
    /* 减少上下内边距，让内容往上移动 */
}

.welcome-symbol span {
    font-size: 48px;
    color: #000;
    font-weight: 300;
}


/* 其他页面样式 */
.page-title {
    font-size: 48px;
    font-weight: 300;
    letter-spacing: -0.02em;
    margin-bottom: 40px;
    text-align: center;
}

.page-description {
    font-size: 18px;
    line-height: 1.6;
    max-width: 600px;
    margin: 0 auto 40px;
    font-weight: 300;
    text-align: center;
}

.hero-dot {
    width: 8px;
    height: 8px;
    background: #5a7c8a;
    border-radius: 50%;
    margin: 0 auto 60px;
}

/* 工具库样式 */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    grid-template-rows: repeat(6, auto);
    gap: 15px;
    margin-bottom: 40px;
}

.tool-category:nth-child(1) {
    grid-column: 1 / 7;
    /* 在线免费工具包占6列 */
    grid-row: 1 / 3;
    /* 占2行 */
}

.tool-category:nth-child(2) {
    grid-column: 7 / 13;
    /* 文献区占6列 */
    grid-row: 1 / 2;
    /* 占1行 */
}

.tool-category:nth-child(3) {
    grid-column: 1 / 5;
    /* 3D软件教程区占4列 */
    grid-row: 3 / 5;
    /* 占2行 */
}

.tool-category:nth-child(4) {
    grid-column: 5 / 9;
    /* 讲座占4列 */
    grid-row: 3 / 4;
    /* 占1行 */
}

.tool-category:nth-child(5) {
    grid-column: 9 / 13;
    /* 交互区占4列 */
    grid-row: 3 / 5;
    /* 占2行 */
}

.tool-category {
    border: 1px solid #e0e0e0;
    padding: 30px;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.tool-category:hover {
    border-color: #000;
    transform: translateY(-2px);
}

.tool-category h3 {
    font-size: 24px;
    font-weight: 500;
    margin-bottom: 20px;
}

.sub-category-title {
    font-size: 18px;
    font-weight: 500;
    margin: 30px 0 15px 0;
    color: #333;
}

.sub-category-title:first-of-type {
    margin-top: 0;
}

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

.tool-item {
    padding: 15px 0;
    border-bottom: 1px solid #f0f0f0;
}

.tool-item:last-child {
    border-bottom: none;
}

.tool-name {
    font-weight: 500;
    margin-bottom: 5px;
}

.tool-name a {
    color: #4a6b7a;
    text-decoration: none;
}

.tool-name a:hover {
    text-decoration: underline;
}

.tool-description {
    font-size: 14px;
    color: #666;
    line-height: 1.4;
}

/* 工具展开/收起功能 */
.hidden-tool {
    display: none;
}

.tool-expand-btn {
    margin-top: 20px;
    padding: 10px 20px;
    background: transparent;
    border: 1px solid #5a7c8a;
    color: #5a7c8a;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.3s ease;
    width: 100%;
}

.tool-expand-btn:hover {
    background: #5a7c8a;
    color: white;
}

/* 教程区样式 */
.tutorials-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    margin-bottom: 80px;
}

.tutorial-column {
    display: flex;
    flex-direction: column;
    border: 1px solid #e0e0e0;
    padding: 30px;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.tutorial-column:hover {
    border-color: #000;
    transform: translateY(-2px);
}

.tutorial-column h3 {
    font-size: 24px;
    font-weight: 500;
    margin-bottom: 30px;
}

.tutorial-item {
    padding: 20px 0;
    border-bottom: 1px solid #eee;
}

.tutorial-item:last-child {
    border-bottom: none;
}

.tutorial-title {
    font-size: 18px;
    font-weight: 500;
    margin-bottom: 10px;
}

.tutorial-title a {
    color: #4a6b7a;
}

.tutorial-title a:hover {
    text-decoration: underline;
}

.tutorial-description {
    font-size: 14px;
    color: #666;
    margin-bottom: 15px;
}

.tutorial-image {
    margin-top: 10px;
}

.tutorial-image img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 8px;
}

/* 关于页面样式 */
.about-content {
    max-width: 900px;
    margin: 0 auto 80px;
    line-height: 1.8;
    padding: 40px;
    background: #fafafa;
    border-radius: 12px;
    border: 1px solid #e8e8e8;
}

.about-content h2 {
    font-size: 28px;
    font-weight: 400;
    margin-bottom: 25px;
    color: #2c2c2c;
    border-bottom: 2px solid #007bff;
    padding-bottom: 10px;
    display: inline-block;
}

.about-content p {
    font-size: 16px;
    margin-bottom: 18px;
    color: #444;
    text-align: left;
    line-height: 1.7;
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-bottom: 50px;
}

.about-column {
    background: white;
    padding: 35px;
    border-radius: 12px;
    border: 1px solid #e8e8e8;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
}

.about-column:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

.about-column h2 {
    font-size: 24px;
    font-weight: 500;
    margin-bottom: 20px;
    color: #2c2c2c;
    border-bottom: 1px solid #e0e0e0;
    padding-bottom: 8px;
}

.about-column p {
    font-size: 15px;
    line-height: 1.6;
    color: #555;
    margin-bottom: 15px;
}


.content-section {
    margin-bottom: 60px;
}

.content-section h2 {
    font-size: 24px;
    font-weight: 400;
    margin-bottom: 20px;
}

.content-section p {
    margin-bottom: 15px;
    line-height: 1.6;
}

.contact-info {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 25px;
    margin-top: 60px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.contact-item {
    text-align: center;
    padding: 25px 20px;
    background: white;
    border: 1px solid #e8e8e8;
    border-radius: 12px;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.contact-item:hover {
    border-color: #5a7c8a;
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(90, 124, 138, 0.15);
}

.contact-item h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 12px;
    color: #2c2c2c;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.contact-item p {
    color: #666;
    font-size: 14px;
    font-weight: 500;
}

/* 艺术家参考导览样式 */
.artist-reference-section {
    margin-top: 60px;
    margin-bottom: 40px;
    display: flex;
    gap: 30px;
    width: 100%;
    align-items: flex-start;
    padding: 30px;
    border: 1px solid #e0e0e0;
    border-radius: 12px;
    background: #fff;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.03);
}

/* 艺术家左侧导览行 */
.artist-nav {
    width: 200px;
    flex-shrink: 0;
    position: sticky;
    top: 140px;
    height: fit-content;
    background: white;
    border-radius: 12px;
    padding: 20px;
    border: 1px solid #f0f0f0;
}

.artist-nav-title {
    font-size: 14px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: #999;
    margin-bottom: 15px;
}

.artist-nav-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.artist-nav-item {
    font-size: 15px;
    font-weight: 400;
    padding: 8px 12px;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
    color: #666;
}

.artist-nav-item:hover {
    background: #f5f7f9;
    color: #5a7c8a;
}

.artist-nav-item.active {
    background: #f0f4f7;
    color: #5a7c8a;
    font-weight: 500;
}

.artist-categories {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 40px;
    max-width: calc(100% - 230px);
}

.artist-category {
    border: 1px solid #e0e0e0;
    padding: 30px;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.artist-category:hover {
    border-color: #5a7c8a;
    transform: translateY(-2px);
}

.artist-category-title {
    font-size: 18px;
    font-weight: 500;
    margin-bottom: 20px;
    color: #3a5a6b;
}

.artist-scroll-container {
    position: relative;
    display: flex;
    align-items: center;
}

.artist-list {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 20px;
}

.artist-list.expanded {
    grid-template-columns: 1fr 1fr 1fr;
}

.expand-btn {
    grid-column: 1 / -1;
    background: transparent;
    color: #5a7c8a;
    border: 2px solid #5a7c8a;
    padding: 12px 24px;
    border-radius: 25px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    margin-top: 20px;
    transition: all 0.3s ease;
    justify-self: center;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.expand-btn:hover {
    background: #5a7c8a;
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(90, 124, 138, 0.3);
}

.hidden-artist {
    display: none;
}

.artist-list.expanded .hidden-artist {
    display: block;
}

.artist-item {
    padding: 20px;
    border: 1px solid #f0f0f0;
    border-radius: 8px;
    transition: all 0.3s ease;
    width: 100%;
    min-width: 0;
}

.artist-item:hover {
    border-color: #5a7c8a;
    transform: translateY(-2px);
}

.artist-name {
    font-weight: 500;
    margin-bottom: 5px;
}

.artist-name a {
    color: #4a6b7a;
    text-decoration: none;
}

.artist-name a:hover {
    text-decoration: underline;
}

.artist-description {
    font-size: 14px;
    color: #666;
    line-height: 1.4;
    margin-bottom: 15px;
}

.artist-image {
    margin-top: 10px;
}

.artist-image img {
    width: 100%;
    height: 350px;
    object-fit: cover;
    border-radius: 8px;
}

/* 付费课程样式 */
.course-detail-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    margin-bottom: 80px;
}

/* AI写作课程样式 */
.bio {
    margin-bottom: 2.6vw;
    font-size: 1.3rem;
    line-height: 1.6rem;
    text-align: justify;
    hyphens: auto;
    -webkit-hyphens: auto;
    -webkit-hyphenate-limit-after: 1;
    -webkit-hyphenate-limit-before: 3;
    -moz-hyphens: auto;
}

.bio .bioname {
    font-family: 'Arial', sans-serif;
    font-weight: bold;
    font-size: 2.7rem;
    line-height: 2.4rem;
    margin: 0 0 1.5rem 0;
    color: #3a5a6b;
    display: flex;
    align-items: center;
    gap: 1rem;
    letter-spacing: 0.02em;
}

.bio .biobracket {
    color: #7f8c8d;
    font-family: 'Arial', sans-serif;
    font-size: 1.1rem;
    font-style: italic;
    margin-bottom: 2rem;
    letter-spacing: 0.03em;
    text-align: center;
}

.paragraphs {
    margin: 1.5rem 0;
}

.paragraph {
    position: relative;
    margin: 1.5rem 0;
}

.paragraph p {
    text-align: justify;
    text-justify: inter-word;
    hyphens: auto;
    -webkit-hyphens: auto;
    -webkit-hyphenate-limit-after: 1;
    -webkit-hyphenate-limit-before: 3;
    -moz-hyphens: auto;
}

.paragraph strong {
    font-family: 'Arial', sans-serif;
    font-weight: bold;
    color: #3a5a6b;
    font-size: 1.3rem;
    letter-spacing: 0.03em;
    hyphens: none;
}

.highlight-conference {
    background-color: #f0f4f7;
    color: #3a5a6b;
    padding: 2px 6px;
    border-radius: 3px;
    font-weight: 500;
}

.highlight-question {
    background-color: #f5f7f9;
    color: #3a5a6b;
    padding: 12px 16px;
    margin: 12px 0;
    border-radius: 3px;
    font-weight: 500;
    border: 1px solid #d8e2e8;
    border-left: 4px solid #a8c4d1;
}

.conference-note {
    font-size: 0.7rem;
    color: #666;
    margin-top: 0.5rem;
    padding-left: 1rem;
}

.module-container {
    margin: 1rem 0;
}

.module {
    margin-bottom: 1.5rem;
    padding: 1rem;
    border: 1px solid #000;
}

.module-content {
    width: 100%;
}

.module-title {
    font-family: 'Arial', sans-serif;
    font-size: 1.4rem;
    font-weight: bold;
    color: #3a5a6b;
    margin: 0 0 0.8rem 0;
    line-height: 1.5;
    letter-spacing: 0.03em;
}

.module-description {
    font-family: 'Arial', sans-serif;
    font-size: 1.1rem;
    line-height: 1.7;
    color: #555;
    margin: 0 0 0.8rem 0;
    letter-spacing: 0.02em;
}

.module-subsection {
    font-family: 'Arial', sans-serif;
    padding: 0.8rem 0;
    font-size: 1.05rem;
    line-height: 1.6;
    color: #666;
    letter-spacing: 0.02em;
}

.module-subsection strong {
    color: #2c3e50;
    font-weight: bold;
    font-family: 'Arial', sans-serif;
}

.course-schedule {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
    font-family: 'Arial', sans-serif;
    font-size: 1.05rem;
    line-height: 1.6;
}

.course-schedule th,
.course-schedule td {
    border: 1px solid #000;
    padding: 0.5rem;
    text-align: left;
    vertical-align: top;
}

.course-schedule th {
    font-family: 'Arial', sans-serif;
    font-weight: bold;
    color: #3a5a6b;
    font-size: 1.1rem;
    letter-spacing: 0.03em;
}

.course-schedule td:nth-child(1) {
    width: 8%;
    text-align: center;
    font-weight: bold;
}

.course-schedule td:nth-child(2) {
    width: 25%;
    font-weight: bold;
    color: #3a5a6b;
}

.course-schedule td:nth-child(3) {
    width: 8%;
    text-align: center;
}

.course-schedule td:nth-child(4) {
    width: 35%;
}

.course-schedule td:nth-child(5) {
    width: 24%;
}

.course-sidebar {
    position: sticky;
    top: 120px;
    height: fit-content;
}

.course-option {
    margin-bottom: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.course-card {
    border: 1px solid #e0e0e0;
    padding: 30px;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.course-option.active .course-card {
    border-color: #5a7c8a;
    box-shadow: 0 4px 12px rgba(90, 124, 138, 0.15);
}

.course-option:hover .course-card {
    transform: translateY(-2px);
}

.course-title {
    font-size: 20px;
    font-weight: 500;
    margin-bottom: 15px;
}

.course-description {
    font-size: 14px;
    color: #666;
    margin-bottom: 20px;
    line-height: 1.5;
}

.course-features {
    list-style: none;
    margin-bottom: 20px;
}

.course-features li {
    font-size: 14px;
    color: #666;
    margin-bottom: 8px;
    padding-left: 20px;
    position: relative;
}

.course-features li:before {
    content: "•";
    position: absolute;
    left: 0;
    color: #5a7c8a;
}

.course-price {
    font-size: 24px;
    font-weight: 600;
    color: #3a5a6b;
}

.content-box {
    background: #fff;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    padding: 30px;
    min-height: 600px;
    transition: all 0.3s ease;
}

.content-box:hover {
    border-color: #000;
    transform: translateY(-2px);
}

.news-page .content-box {
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
    min-height: auto;
    padding: 40px;
}

.course-content-section {
    display: none;
}

.course-content-section.active {
    display: block;
}

.course-section {
    margin-bottom: 40px;
}

.course-section h2 {
    font-size: 28px;
    font-weight: 500;
    margin-bottom: 20px;
}

.course-section h3 {
    font-size: 20px;
    font-weight: 500;
    margin: 30px 0 15px;
}

.course-section p {
    line-height: 1.6;
    margin-bottom: 15px;
}

.course-section ul {
    margin: 20px 0;
    padding-left: 20px;
}

.course-section li {
    margin-bottom: 10px;
    line-height: 1.6;
}

.back-link {
    position: fixed;
    top: 120px;
    left: 40px;
    z-index: 999;
    color: #5a7c8a;
    font-size: 14px;
    text-decoration: none;
    padding: 10px 15px;
    border: 1px solid #5a7c8a;
    border-radius: 20px;
    background: white;
    transition: all 0.3s ease;
}

.back-link:hover {
    background: #5a7c8a;
    color: white;
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .tools-grid {
        grid-template-columns: 1fr;
        grid-template-rows: repeat(5, auto);
        gap: 15px;
    }

    .tool-category:nth-child(1),
    .tool-category:nth-child(2),
    .tool-category:nth-child(3),
    .tool-category:nth-child(4),
    .tool-category:nth-child(5) {
        grid-column: 1;
        grid-row: auto;
    }

    .tutorials-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .course-detail-layout {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .course-sidebar {
        position: static;
        order: 2;
    }
}

@media (max-width: 1024px) {
    .artist-reference-section {
        flex-direction: column;
        padding: 20px;
    }

    .artist-nav {
        width: 100%;
        position: static;
        margin-bottom: 20px;
    }

    .artist-nav-list {
        flex-direction: row;
        overflow-x: auto;
        padding-bottom: 10px;
        gap: 15px;
    }

    .artist-nav-item {
        white-space: nowrap;
    }

    .artist-categories {
        max-width: 100%;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 20px;
    }

    .header {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }

    .nav {
        gap: 24px;
    }

    .nav-controls {
        margin-left: 0;
    }

    .hero-title {
        font-size: clamp(60px, 12vw, 120px);
        /* 移动端字体大小：进一步减小确保完整显示 */
        max-width: 95vw;
        /* 移动端最大宽度：95%视口宽度 */
    }

    .intro-description {
        font-size: 18px;
    }

    .page-title {
        font-size: 36px;
    }

    .tools-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    .tutorials-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .contact-info {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .back-link {
        position: static;
        display: inline-block;
        margin-bottom: 20px;
    }

    .artist-list {
        grid-template-columns: 1fr;
    }

    .artist-list.expanded {
        grid-template-columns: 1fr;
    }
}