/* ============================================
   现代化阅读体验增强样式
   不改变外观,只优化交互和阅读体验
============================================ */

/* ==================== 平滑加载动画 ==================== */
body {
    opacity: 0;
    transition: opacity 0.3s ease-in;
}

body.loaded {
    opacity: 1;
}

/* ==================== 段落淡入动画 ==================== */
.fade-in-element {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

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

/* ==================== 代码块复制按钮 ==================== */
.code-block-wrapper {
    position: relative;
    margin: var(--space-6) 0;
}

.copy-code-btn {
    position: absolute;
    top: 8px;
    right: 8px;
    padding: 6px 10px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 4px;
    color: rgba(255, 255, 255, 0.8);
    cursor: pointer;
    font-size: 12px;
    transition: all 0.2s ease;
    z-index: 10;
    display: flex;
    align-items: center;
    gap: 4px;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

.copy-code-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.3);
    color: #fff;
    transform: translateY(-1px);
}

.copy-code-btn.copied {
    background: rgba(26, 127, 55, 0.3);
    border-color: rgba(46, 160, 67, 0.5);
    color: #4ade80;
}

/* 确保代码块包装器不影响原有标签 */
.code-block-wrapper > pre {
    margin: 0;
}

/* ==================== 图片灯箱 ==================== */
.image-lightbox {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 9999;
    display: none;
    align-items: center;
    justify-content: center;
}

.image-lightbox.active {
    display: flex;
}

.lightbox-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    animation: fadeIn 0.3s ease;
}

.lightbox-content {
    position: relative;
    z-index: 1;
    max-width: 90vw;
    max-height: 90vh;
    animation: zoomIn 0.3s ease;
}

.lightbox-image {
    max-width: 100%;
    max-height: 90vh;
    object-fit: contain;
    border-radius: 8px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.lightbox-close {
    position: absolute;
    top: -40px;
    right: 0;
    background: transparent;
    border: none;
    color: white;
    font-size: 32px;
    cursor: pointer;
    padding: 8px;
    line-height: 1;
    transition: transform 0.2s ease;
}

.lightbox-close:hover {
    transform: scale(1.2);
}

@keyframes zoomIn {
    from {
        opacity: 0;
        transform: scale(0.8);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* ==================== 段落高亮 ==================== */
.content-body p,
.content-body li {
    transition: background-color 0.3s ease;
    cursor: pointer;
    border-radius: 4px;
    padding: 2px 4px;
    margin-left: -4px;
    margin-right: -4px;
}

.content-body p:hover,
.content-body li:hover {
    background-color: rgba(136, 136, 136, 0.05);
}

.content-body p.highlighted,
.content-body li.highlighted {
    background-color: var(--color-accent-subtle);
    animation: highlightPulse 0.6s ease;
}

@keyframes highlightPulse {
    0%, 100% {
        box-shadow: 0 0 0 0 var(--color-accent);
    }
    50% {
        box-shadow: 0 0 0 8px transparent;
    }
}

/* ==================== 标题锚点链接 ==================== */
.content-body h2,
.content-body h3 {
    position: relative;
}

.heading-anchor {
    position: absolute;
    left: -1.5em;
    opacity: 0;
    color: var(--color-accent);
    text-decoration: none;
    font-weight: 400;
    transition: opacity 0.2s ease;
    padding: 0 0.5em;
}

.content-body h2:hover .heading-anchor,
.content-body h3:hover .heading-anchor {
    opacity: 1;
}

.heading-anchor:hover {
    color: var(--color-accent-hover);
}

/* 移动端始终显示 */
@media (max-width: 768px) {
    .heading-anchor {
        opacity: 0.5;
    }
}

/* ==================== 目录激活状态 ==================== */
.table-of-contents a {
    position: relative;
    padding-left: 8px;
    border-left: 2px solid transparent;
    transition: all 0.3s ease;
}

.table-of-contents a.active {
    color: var(--color-accent);
    border-left-color: var(--color-accent);
    background-color: var(--color-accent-subtle);
    font-weight: 600;
}

/* ==================== 改进的返回顶部按钮 ==================== */
.back-to-top {
    position: relative;
    overflow: visible;
}

.back-to-top .progress-ring {
    position: absolute;
    top: 0;
    left: 0;
    transform: rotate(-90deg);
    opacity: 0.3;
}

.back-to-top .progress-ring-circle {
    transition: stroke-dashoffset 0.1s ease;
}

.back-to-top .arrow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.back-to-top:hover .progress-ring {
    opacity: 0.6;
}

/* ==================== 文本选择样式优化 ==================== */
.content-body ::selection {
    background-color: var(--color-accent-subtle);
    color: var(--color-text-primary);
}

/* ==================== 链接悬停效果增强 ==================== */
.content-body a:not(.heading-anchor) {
    position: relative;
    text-decoration: none;
    color: var(--color-accent);
    border-bottom: 1px solid var(--color-accent);
    transition: all 0.2s ease;
}

.content-body a:not(.heading-anchor):hover {
    color: var(--color-accent-hover);
    border-bottom-color: var(--color-accent-hover);
    background-color: var(--color-accent-subtle);
    padding: 0 4px;
    margin: 0 -4px;
}

/* ==================== 引用块增强 ==================== */
.content-body blockquote {
    position: relative;
    transition: transform 0.3s ease;
}

.content-body blockquote:hover {
    transform: translateX(4px);
}

.content-body blockquote::before {
    content: '"';
    position: absolute;
    top: -10px;
    left: 10px;
    font-size: 3em;
    color: var(--color-accent);
    opacity: 0.2;
    font-family: Georgia, serif;
}

/* ==================== 列表标记动画 ==================== */
.content-body ul li {
    transition: all 0.2s ease;
}

.content-body ul li:hover {
    padding-left: 4px;
}

/* ==================== 表格悬停增强 ==================== */
.content-body table {
    transition: box-shadow 0.3s ease;
}

.content-body table:hover {
    box-shadow: var(--shadow-md);
}

/* ==================== 代码块悬停效果 ==================== */
.content-body pre {
    transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.content-body pre:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

/* ==================== 图片悬停效果 ==================== */
.content-body img {
    transition: all 0.3s ease;
}

.content-body img:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-xl);
}

/* ==================== 字体渲染优化 ==================== */
.content-body {
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-feature-settings: "kern" 1, "liga" 1;
}

/* ==================== 段落间距优化 ==================== */
.content-body p + p {
    margin-top: var(--space-6);
}

.content-body h2 + p,
.content-body h3 + p {
    margin-top: var(--space-4);
}

/* ==================== 焦点指示器 ==================== */
.content-body a:focus-visible,
.copy-code-btn:focus-visible,
.back-to-top:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 4px;
    border-radius: 4px;
}

/* ==================== 响应式优化 ==================== */
@media (max-width: 768px) {
    .copy-code-btn {
        top: 4px;
        right: 4px;
        padding: 4px 8px;
        font-size: 11px;
    }

    .heading-anchor {
        left: -1em;
        font-size: 0.8em;
    }

    .lightbox-content {
        max-width: 95vw;
        max-height: 85vh;
    }

    .lightbox-close {
        top: -35px;
        font-size: 28px;
    }
}

/* ==================== 暗色模式优化 ==================== */
@media (prefers-color-scheme: dark) {
    .copy-code-btn {
        background: rgba(255, 255, 255, 0.08);
        border-color: rgba(255, 255, 255, 0.15);
    }

    .copy-code-btn:hover {
        background: rgba(255, 255, 255, 0.15);
        border-color: rgba(255, 255, 255, 0.25);
    }

    .content-body p:hover,
    .content-body li:hover {
        background-color: rgba(255, 255, 255, 0.05);
    }
}

/* ==================== 打印样式 ==================== */
@media print {
    .copy-code-btn,
    .image-lightbox,
    .back-to-top,
    .reading-progress,
    .heading-anchor {
        display: none !important;
    }

    .fade-in-element {
        opacity: 1 !important;
        transform: none !important;
    }
}