@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

/* ========================================
   基础变量 & 主题 (方案A: Elegant Glass - 核心性能版)
   ======================================== */
:root {
    --color-bg-base: #0f172a;
    --color-text: #f8fafc;
    --color-text-muted: #94a3b8;
    --color-primary: #38bdf8;
    --color-primary-hover: #0ea5e9;
    --gradient-primary: linear-gradient(135deg, #38bdf8, #818cf8, #c084fc);

    /* 大幅降低性能开销：用纯色半透明代替所有大面积元素的毛玻璃（backdrop-filter） */
    --glass-bg: rgba(22, 30, 46, 0.85);
    --glass-bg-hover: rgba(30, 41, 59, 1);
    --glass-border: rgba(255, 255, 255, 0.06);
    --glass-border-hover: rgba(255, 255, 255, 0.15);
    --glass-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);

    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    --max-width: 860px;
    --spacing: 1.5rem;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg-base);
    color: var(--color-text);
    line-height: 1.8;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    position: relative;
    z-index: 0;
}

/* 性能优化：剥离影响滚动的 background-attachment: fixed，改为基于 Fixed 伪元素 */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    background-image:
        radial-gradient(circle at 15% 15%, rgba(56, 189, 248, 0.05), transparent 40%),
        radial-gradient(circle at 85% 85%, rgba(192, 132, 252, 0.05), transparent 40%);
    pointer-events: none;
}

/* 性能优化：不使用 transition: all，只过渡确定的颜色和阴影 */
a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color 0.2s ease, text-shadow 0.2s ease;
}

a:hover {
    color: #e0e7ff;
    text-shadow: 0 0 8px rgba(56, 189, 248, 0.5);
}

::selection {
    background: rgba(56, 189, 248, 0.3);
    color: #fff;
}

/* ========================================
   Header (整个页面仅此处保留极为昂贵的毛玻璃效果，由于面积小，性能正常)
   ======================================== */
.site-header {
    background: rgba(15, 23, 42, 0.65);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--glass-border);
    padding: 1.25rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.site-title {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    letter-spacing: -0.5px;
    transition: filter 0.3s ease;
}

.site-title:hover {
    filter: drop-shadow(0px 0px 8px rgba(192, 132, 252, 0.4));
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.nav-links a {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    font-weight: 500;
    position: relative;
    padding-bottom: 4px;
}

/* 性能优化：下划线动画由改变 width 替换为 transform 的 scaleX，强制硬件加速 */
.nav-links a::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 2px;
    bottom: 0px;
    left: 0;
    background: var(--gradient-primary);
    border-radius: 2px;
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s ease;
}

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

.nav-links a:hover::after {
    transform: scaleX(1);
}

/* ========================================
   Main Content
   ======================================== */
.main-content {
    flex: 1;
    max-width: var(--max-width);
    margin: 2rem auto;
    padding: 0 var(--spacing);
    width: 100%;
}

/* ========================================
   文章列表 卡片矩阵
   ======================================== */
.posts-list-header,
.taxonomy-list h1,
.taxonomy-term h1,
.search-page h1 {
    font-size: 2.25rem;
    font-weight: 700;
    margin-bottom: 2rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.25rem;
    /* 防止不同高度的卡片被强制拉伸一样高，避免留下大片空白 */
}

.post-card {
    display: flex;
    flex-direction: column;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 1.25rem 1.5rem;
    box-shadow: var(--glass-shadow);
    /* 性能核心优化：明确声明使用硬件加速相关的过渡，拒绝使用 `all` 避免浏览器全局重绘 */
    transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease, background-color 0.25s ease;
    will-change: transform;
}

.post-card:hover {
    background: var(--glass-bg-hover);
    border-color: var(--glass-border-hover);
    transform: translateY(-4px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.3), 0 0 15px rgba(56, 189, 248, 0.1);
}

.post-title {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    line-height: 1.4;
    min-height: 3.64rem;
    /* 强制标题占满两行高度 (1.3rem * 1.4 * 2)，确保没有摘要的卡片高度绝对一致 */
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.post-title a {
    color: var(--color-text);
}

.post-card:hover .post-title a {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.post-meta {
    color: var(--color-text-muted);
    font-size: 0.85rem;
    margin-top: auto;
    /* 利用自适应间距将 Meta 始终压紧在卡片底部 */
    margin-bottom: 0;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 1rem;
}

.post-summary {
    color: var(--color-text-muted);
    margin-top: 1rem;
    margin-bottom: 0;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Tags & Categories */
.post-tags,
.post-categories {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: auto;
    /* Ensures tags stay at bottom of flex card */
}

.tag,
.post-categories a {
    background: rgba(15, 23, 42, 0.8);
    color: var(--color-text-muted);
    padding: 0.35rem 0.85rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
    border: 1px solid var(--glass-border);
    transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.tag:hover,
.post-categories a:hover {
    background: var(--gradient-primary);
    color: #fff;
    border-color: transparent;
    box-shadow: 0 4px 12px rgba(192, 132, 252, 0.4);
}

/* ========================================
   单篇文章阅读区
   ======================================== */
.post {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 3rem;
    box-shadow: var(--glass-shadow);
}

.post-header {
    margin-bottom: 3rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--glass-border);
    text-align: center;
}

.post-header .post-title {
    font-size: 2.75rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.3;
}

.post-header .post-meta {
    justify-content: center;
}

.post-content {
    font-size: 1.1rem;
    color: #f1f5f9;
}

.post-content h2,
.post-content h3,
.post-content h4 {
    margin-top: 2.5rem;
    margin-bottom: 1.25rem;
    color: #fff;
    font-weight: 600;
}

.post-content h2 {
    font-size: 1.75rem;
    position: relative;
    padding-bottom: 0.5rem;
}

.post-content h2::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    height: 2px;
    width: 3rem;
    background: var(--gradient-primary);
    border-radius: 2px;
}

.post-content h3 {
    font-size: 1.4rem;
}

.post-content p {
    margin-bottom: 1.5rem;
}

.post-content ul,
.post-content ol {
    margin-bottom: 1.5rem;
    padding-left: 1.8rem;
}

.post-content li {
    margin-bottom: 0.75rem;
}

.post-content blockquote {
    background: rgba(56, 189, 248, 0.05);
    border-left: 4px solid var(--color-primary);
    padding: 1.25rem 1.5rem;
    margin: 2rem 0;
    color: #cbd5e1;
    border-radius: 0 8px 8px 0;
    font-style: italic;
}

.post-content pre {
    background: #0d1117 !important;
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 1.25rem;
    overflow-x: auto;
    margin: 2rem 0;
    box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.5);
}

/* Zola 代码块行号样式 */
.giallo-l {
    display: inline-block;
    min-height: 1lh;
    width: 100%;
}

.giallo-ln {
    display: inline-block;
    user-select: none;
    -webkit-user-select: none;
    margin-right: 0.8em;
    padding-right: 0.4em;
    min-width: 3ch;
    text-align: right;
    opacity: 0.5;
    color: #6e7681;
    border-right: 1px solid rgba(255, 255, 255, 0.08);
}

.post-content code {
    font-family: var(--font-mono);
    font-size: 0.95rem;
}

.post-content p code,
.post-content li code {
    background: rgba(255, 255, 255, 0.1);
    color: #7dd3fc;
    padding: 0.2rem 0.4rem;
    border-radius: 6px;
    font-size: 0.9em;
}

.post-content img {
    max-width: 100%;
    height: auto;
    border-radius: 12px;
    margin: 2rem 0;
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
}

.post-footer {
    margin-top: 3rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--glass-border);
}

.post-nav {
    display: flex;
    justify-content: space-between;
    margin-top: 2rem;
    gap: 1rem;
}

.post-nav a {
    flex: 1;
    background: var(--glass-bg);
    padding: 1rem 1.5rem;
    border-radius: 12px;
    border: 1px solid var(--glass-border);
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
    text-align: center;
    font-weight: 500;
}

.post-nav a:hover {
    background: var(--glass-bg-hover);
    border-color: var(--color-primary);
    box-shadow: 0 4px 15px rgba(56, 189, 248, 0.2);
    transform: translateY(-2px);
}

/* ========================================
   Taxonomy (分类/标签列表矩阵页)
   ======================================== */
.taxonomy-items {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 1.25rem;
}

.taxonomy-items li a {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    padding: 0.75rem 1.5rem;
    border-radius: 12px;
    font-size: 1.05rem;
    font-weight: 500;
    transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease, border-color 0.2s ease;
    color: var(--color-text);
}

.taxonomy-items li a:hover {
    background: var(--gradient-primary);
    color: #fff;
    border-color: transparent;
    transform: translateY(-4px);
    box-shadow: 0 8px 20px rgba(192, 132, 252, 0.3);
}

.taxonomy-items li a .count {
    background: rgba(0, 0, 0, 0.3);
    padding: 0.1rem 0.5rem;
    border-radius: 20px;
    font-size: 0.8rem;
}

/* ========================================
   Search 面板
   ======================================== */
#search-input {
    width: 100%;
    padding: 1.25rem;
    font-size: 1.1rem;
    background: var(--glass-bg);
    border: 2px solid var(--glass-border);
    border-radius: 12px;
    color: var(--color-text);
    outline: none;
    transition: border-color 0.2s ease, background-color 0.2s ease, box-shadow 0.2s ease;
    box-shadow: var(--glass-shadow);
}

#search-input:focus {
    border-color: var(--color-primary);
    background: rgba(30, 41, 59, 1);
    box-shadow: 0 0 0 4px rgba(56, 189, 248, 0.15);
}

#search-input::placeholder {
    color: #64748b;
}

.result-item {
    background: var(--glass-bg);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1rem;
    border: 1px solid var(--glass-border);
}

/* ========================================
   Pagination
   ======================================== */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1.5rem;
    margin-top: 3rem;
}

.pagination a {
    background: var(--glass-bg);
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--glass-border);
    font-weight: 500;
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.pagination a:hover {
    background: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
    box-shadow: 0 4px 15px rgba(56, 189, 248, 0.3);
}

.pagination span {
    font-weight: 500;
    color: var(--color-text-muted);
}

/* ========================================
   Footer
   ======================================== */
.site-footer {
    margin-top: auto;
    background: rgba(15, 23, 42, 0.3);
    border-top: 1px solid var(--glass-border);
    padding: 2.5rem 0;
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.95rem;
    letter-spacing: 0.5px;
}

/* ========================================
   响应式调整
   ======================================== */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: 1rem;
    }

    .post {
        padding: 1.5rem;
    }

    .post-header .post-title {
        font-size: 2rem;
    }

    .post-nav {
        flex-direction: column;
    }

    .post-nav a {
        width: 100%;
        max-width: none;
    }
}