/* ===== CityU Review 课程资料库样式 ===== */
:root {
    --bg-color: #050505;
    --card-bg: rgba(20, 20, 20, 0.6);
    --card-border: rgba(255, 255, 255, 0.1);
    --card-hover-border: rgba(180, 139, 62, 0.5);
    
    --text-primary: #ffffff;
    --text-secondary: #9ca3af;
    
    --cityu-burgundy: #850029; 
    --cityu-gold: #B48B3E;
    
    --spotlight-color: rgba(255, 255, 255, 0.08);
    
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
}

.hidden {
    display: none !important;
}

html {
    min-height: 100%;
    background-color: #0f0f1e;
}

body {
    background: transparent;
    color: var(--text-primary);
    font-family: var(--font-sans);
    min-height: 100vh;
    min-height: 100dvh;
    padding: 20px;
    overflow-x: hidden;
    position: relative;
    z-index: 0;
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    background:
        radial-gradient(circle at 20% 50%, rgba(133, 0, 41, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(50, 20, 100, 0.25) 0%, transparent 50%),
        radial-gradient(circle at 90% 80%, rgba(20, 80, 150, 0.2) 0%, transparent 50%),
        linear-gradient(135deg, #0f0f1e 0%, #1a0a15 40%, #0a1520 100%);
    z-index: -10;
    pointer-events: none;
}

/* 3D 背景容器 */
#canvas-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -5;
    opacity: 0.6;
    pointer-events: none;
}

/* 顶部遮罩 */
.header-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(
        circle at 50% 0%, 
        rgba(133, 0, 41, 0.25) 0%,
        rgba(74, 10, 30, 0.15) 40%,
        transparent 80%
    );
    z-index: -1;
    pointer-events: none;
}

/* 容器 */
.container {
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
    position: relative;
    z-index: 1;
}

/* 头部 */
header {
    text-align: center;
    margin-bottom: 60px;
    padding: 60px 20px 40px;
}

header h1 {
    font-size: 4rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.1;
    margin-bottom: 16px;
    background: linear-gradient(120deg, #ffffff 30%, #999 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}
.review-title {
    font-size: 4.5rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.1;
    margin-bottom: 24px;
    color: #fff;
}

.review-title .highlight {
    background: linear-gradient(120deg, #ffffff 30%, #999 100%);
    -webkit-background-clip: text; /* WebKit 专有属性，用于裁剪背景以适应文本内容 */
    background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
}

.subtitle {
    font-size: 1.3rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.course-count {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.course-count span {
    color: var(--cityu-gold);
    font-weight: 700;
    padding: 0 4px;
}

/* 搜索框 */
.search-box {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 12px;
    margin-bottom: 50px;
}

.search-box input {
    width: 100%;
    max-width: 500px;
    background: rgba(10, 10, 10, 0.8);
    border: 1px solid var(--card-border);
    padding: 16px 24px;
    border-radius: 14px;
    color: #fff;
    font-size: 1rem;
    transition: all 0.2s;
    outline: none;
}

.search-box input:focus {
    border-color: rgba(255, 255, 255, 0.3);
    background: rgba(20, 20, 20, 0.9);
    box-shadow: 0 0 0 4px rgba(255, 255, 255, 0.05);
}

.search-box input::placeholder {
    color: var(--text-secondary);
}

.repo-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    white-space: nowrap;
    color: white;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.12);
    text-decoration: none;
    font-size: 0.95rem;
    padding: 14px 16px;
    border-radius: 12px;
    transition: all 0.2s;
    font-weight: 600;
}

.repo-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-1px);
}

@media (max-width: 640px) {
    .search-box {
        flex-direction: column;
        align-items: stretch;
    }
    .search-box input {
        max-width: none;
    }
}

/* 课程网格 */
.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

/* 课程卡片 */
.course-card {
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 28px;
    cursor: pointer;
    transition: transform 0.2s, border-color 0.2s;
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}


/* 详情两列布局 */
.detail-layout {
    display: grid;
    grid-template-columns: minmax(320px, 1.2fr) minmax(360px, 1fr);
    gap: 24px;
    align-items: start;
}

.detail-left, .detail-right {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 12px;
    padding: 18px 20px;
}

.detail-left h2, .detail-right h2 {
    margin-top: 0;
}

.course-html {
    color: var(--text-primary);
    line-height: 1.7;
}

.course-html p {
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.course-html a {
    color: var(--cityu-gold);
}

.muted {
    color: var(--text-secondary);
}
/* Spotlight 光晕效果 */
.course-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: radial-gradient(
        800px circle at var(--x, 50%) var(--y, 50%),
        var(--spotlight-color),
        transparent 40%
    );
    opacity: 0;
    transition: opacity 0.5s;
    z-index: 1;
    pointer-events: none;
}

.courses-grid:hover .course-card::before {
    opacity: 1;
}

.course-card:hover {
    transform: translateY(-4px);
    border-color: var(--card-hover-border);
}

.course-card > * {
    position: relative;
    z-index: 2;
}

.course-code {
    color: var(--cityu-gold);
    font-weight: 700;
    font-size: 0.9rem;
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.course-name {
    color: var(--text-primary);
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 20px;
    line-height: 1.4;
    min-height: 60px;
}

.course-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: white;
    background: linear-gradient(135deg, var(--cityu-burgundy) 0%, #a0002e 100%);
    text-decoration: none;
    font-size: 0.95rem;
    padding: 12px 20px;
    border-radius: 10px;
    transition: all 0.3s;
    font-weight: 600;
    border: 1px solid rgba(133, 0, 41, 0.3);
    box-shadow: 0 4px 12px rgba(133, 0, 41, 0.2);
}

.course-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(133, 0, 41, 0.35);
}

/* 无结果提示 */
.no-results {
    text-align: center;
    padding: 80px 20px;
    color: var(--text-secondary);
    grid-column: 1 / -1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.no-results .emoji {
    font-size: 4em;
    margin-bottom: 20px;
    display: block;
}

.no-results p {
    font-size: 1.2em;
    margin-bottom: 10px;
}

/* 详情页视图 */
#detailView {
    display: none;
}

#detailView.active {
    display: block;
}

#listView.hidden {
    display: none;
}

.detail-container {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 40px;
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
    overflow-x: hidden;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

/* 课程详情页（新版） */
.course-detail-header {
    display: grid;
    grid-template-columns: var(--side-width, auto) 1fr var(--side-width, 0px);
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
}

.course-detail-header .review-title {
    margin: 0;
    justify-self: center;
    text-align: center;
    max-width: 100%;
}

.course-detail-header .course-back {
    justify-self: start;
    white-space: nowrap;
}

.course-detail-header-spacer {
    justify-self: end;
}

.course-detail-layout {
    display: grid;
    grid-template-columns: minmax(520px, 1.8fr) minmax(320px, 1fr);
    gap: 24px;
    align-items: start;
    width: 100%;
    max-width: 100%;
    min-width: 0;
}

.course-panel {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 12px;
    padding: 18px 20px;
    min-width: 0;
}

.course-panel h2 {
    margin-top: 0;
}

.course-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 8px;
}

.course-action-btn {
    cursor: pointer;
    border: 1px solid rgba(133, 0, 41, 0.3);
}

.course-action-btn[disabled] {
    opacity: 0.6;
    cursor: not-allowed;
}

@media (max-width: 1000px) {
    .course-detail-layout {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .course-detail-header {
        grid-template-columns: 1fr;
    }
    .course-detail-header .review-title {
        justify-self: start;
        text-align: left;
    }
    .course-detail-header-spacer {
        display: none;
    }
}

/* 课程内容排版（对齐 mdx_to_html_converter 生成风格） */
.course-html table {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0;
    table-layout: fixed;
}

.course-html thead th {
    background: rgba(255, 255, 255, 0.04);
    color: var(--text-primary);
    font-weight: 600;
}

.course-html th,
.course-html td {
    padding: 12px 14px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    text-align: left;
    overflow-wrap: anywhere;
    word-break: break-word;
}

.course-html tbody tr:hover {
    background: rgba(255, 255, 255, 0.03);
}

.course-html table caption {
    caption-side: top;
    text-align: left;
    color: var(--text-secondary);
    padding: 8px 0;
}

.course-html h1 {
    font-size: 2rem;
    margin: 18px 0 10px;
}

.course-html h2 {
    font-size: 1.5rem;
    margin: 18px 0 10px;
}

.course-html h3 {
    font-size: 1.2rem;
    margin: 16px 0 8px;
}

.course-html {
    overflow-wrap: anywhere;
    word-break: break-word;
}

.course-html img,
.course-html video,
.course-html iframe {
    max-width: 100%;
}

.course-html pre {
    max-width: 100%;
    overflow: auto;
    -webkit-overflow-scrolling: touch;
}

/* 预览弹窗 */
body.modal-open {
    overflow: hidden;
}

.preview-modal {
    position: fixed;
    inset: 0;
    z-index: 9999;
    display: grid;
    place-items: center;
    padding: 24px;
}

.preview-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
}

.preview-dialog {
    position: relative;
    width: min(1100px, 100%);
    max-height: min(80vh, 920px);
    background: rgba(20, 20, 20, 0.92);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 14px;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
    display: flex;
    flex-direction: column;
}

.preview-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 14px 16px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.preview-title {
    font-weight: 700;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.preview-close {
    appearance: none;
    border: 1px solid rgba(255, 255, 255, 0.12);
    background: rgba(255, 255, 255, 0.06);
    color: var(--text-primary);
    border-radius: 10px;
    width: 40px;
    height: 36px;
    cursor: pointer;
    font-size: 22px;
    line-height: 1;
}

.preview-close:hover {
    background: rgba(255, 255, 255, 0.1);
}

.preview-body {
    padding: 12px 12px 16px;
    overflow: auto;
}

.preview-frame {
    width: 100%;
    height: min(70vh, 780px);
    border: none;
    border-radius: 10px;
    background: #111;
}

.preview-image {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 0 auto;
    border-radius: 10px;
}

.preview-video,
.preview-audio {
    width: 100%;
}


/* 详情两列布局 */
.detail-layout {
    display: grid;
    grid-template-columns: minmax(320px, 1.2fr) minmax(360px, 1fr);
    gap: 24px;
    align-items: start;
}

.detail-left, .detail-right {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 12px;
    padding: 18px 20px;
}

.detail-left h2, .detail-right h2 {
    margin-top: 0;
}

.course-html {
    color: var(--text-primary);
    line-height: 1.7;
}

.course-html p {
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.course-html a {
    color: var(--cityu-gold);
}

.muted {
    color: var(--text-secondary);
}
.back-btn {
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.1);
    color: var(--text-primary);
    padding: 12px 24px;
    border-radius: 10px;
    cursor: pointer;
    font-size: 1em;
    margin-bottom: 30px;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.back-btn:hover {
    background: rgba(255,255,255,0.1);
    transform: translateX(-4px);
}

/* 详情页内容样式 */
.detail-container h1 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.detail-container h2 {
    font-size: 1.8rem;
    margin: 30px 0 15px;
    color: var(--text-primary);
    border-bottom: 2px solid var(--card-border);
    padding-bottom: 10px;
}

.detail-container h3 {
    font-size: 1.4rem;
    margin: 25px 0 12px;
    color: var(--text-primary);
}

.detail-container p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 15px;
}

.detail-container strong {
    color: var(--cityu-gold);
}

.detail-container hr {
    border: none;
    border-top: 1px solid var(--card-border);
    margin: 40px 0;
}

/* 可折叠文件树 */
.file-tree {
    margin-top: 20px;
}

.folder-item {
    margin: 8px 0;
}

.folder-header {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.2s;
    user-select: none;
}

.folder-header:hover {
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(255, 255, 255, 0.1);
}

.folder-icon {
    transition: transform 0.2s;
    font-size: 1.1em;
}

.folder-item.collapsed .folder-icon {
    transform: rotate(-90deg);
}

.folder-content {
    margin-left: 20px;
    padding-left: 20px;
    border-left: 2px solid rgba(255, 255, 255, 0.1);
    overflow: hidden;
    transition: max-height 0.3s ease;
    margin-top: 8px;
}

.folder-item.collapsed .folder-content {
    max-height: 0 !important;
    margin-top: 0;
}

.folder-count {
    font-size: 0.85em;
    color: var(--text-secondary);
    margin-left: auto;
    background: rgba(255, 255, 255, 0.05);
    padding: 2px 8px;
    border-radius: 6px;
}

/* 文件列表 */
.file-list {
    list-style: none;
    padding: 8px 0;
    margin: 0;
}

.file-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    margin: 4px 0;
    border-radius: 8px;
    transition: background 0.2s;
    min-width: 0;
}

.file-item:hover {
    background: rgba(255, 255, 255, 0.05);
}

.file-link {
    color: var(--cityu-gold);
    text-decoration: none;
    flex-grow: 1;
    display: flex;
    align-items: center;
    gap: 8px;
    min-width: 0;
    overflow-wrap: anywhere;
    word-break: break-word;
}

.file-link:hover {
    text-decoration: underline;
}

.download-link {
    font-size: 14px;
    color: var(--text-secondary);
    text-decoration: none;
    opacity: 0.6;
    transition: opacity 0.2s;
}

.download-link:hover {
    opacity: 1;
    color: var(--cityu-gold);
}

/* 页脚 */
footer {
    text-align: center;
    color: var(--text-secondary);
    padding: 40px 20px;
    margin-top: 80px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

/* 响应式设计 */
@media (max-width: 768px) {
    header h1 {
        font-size: 2.5rem;
    }

    .subtitle {
        font-size: 1.1rem;
    }

    .review-title {
        font-size: 2.5rem; /* 更小的标题字体 */
        text-align: center;
    }
    
    .courses-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    .search-box input {
        max-width: 100%;
        font-size: 16px;
    }

    .course-card {
        padding: 20px;
    }

    .detail-container {
        padding: 24px;
    }

    .detail-container h1 {
        font-size: 2rem;
    }

    .detail-layout {
        grid-template-columns: 1fr;
    }
}

/* Safari 兼容性 */
@supports (-webkit-backdrop-filter: blur(0)) {
    .course-card, .detail-container {
        -webkit-backdrop-filter: blur(12px);
        backdrop-filter: blur(12px);
    }
}