/* ============================================================
   zlog · macOS Vibrancy（macOS 毛玻璃）设计系统
   多层深灰面板 + 系统级 backdrop-blur + 1px 半透明边框
   无渐变 · 无发光 · 无装饰动画
   ============================================================ */

/* ---------- Token ---------- */
:root {
    --bg-0: #1c1c1e;                /* 最底层 */
    --bg-1: #2c2c2e;                /* 面板 / 卡片 */
    --bg-2: #3a3a3c;                /* 按钮 / 浮层 */
    --bg-0-60: rgba(28,28,30,.62);  /* 毛玻璃底 */
    --bg-1-80: rgba(44,44,46,.8);   /* 毛玻璃面板 */
    --border: rgba(255,255,255,.1);
    --border-strong: rgba(255,255,255,.16);
    --text-1: rgba(255,255,255,.95);
    --text-2: rgba(255,255,255,.7);
    --text-3: rgba(255,255,255,.42);
    --accent: #7474ff;              /* 焦点环 / 高亮文字 */
    --accent-ring: rgba(100,100,255,.35);
    --success: #4cd97b;
    --danger: #ff6b6b;
    --radius: 12px;                 /* rounded-xl（上限） */
    --radius-sm: 8px;               /* rounded-lg */
    --font-serif: Georgia, "Times New Roman", "Songti SC", "SimSun", serif;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
    --shadow-float: 0 2px 8px rgba(0,0,0,.3);
    --shadow-line: 0 1px 0 rgba(255,255,255,.05);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
    font-family: var(--font-sans);
    background: var(--bg-0);
    color: var(--text-2);
    line-height: 1.8;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}
::selection { background: var(--accent-ring); }
a { color: var(--text-1); text-decoration: none; transition: color .2s ease-out; }
a:hover { color: #fff; }
.container { max-width: 720px; margin: 0 auto; padding: 0 22px; }

/* ---------- 头部（毛玻璃） ---------- */
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: var(--bg-0-60);
    -webkit-backdrop-filter: saturate(160%) blur(20px);
    backdrop-filter: saturate(160%) blur(20px);
    border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; gap: 22px; height: 58px; }
.logo {
    font-family: var(--font-serif);
    font-size: 20px;
    font-weight: 600;
    color: var(--text-1);
    letter-spacing: .01em;
}
.logo:hover { color: #fff; }
.main-nav { display: flex; gap: 20px; flex: 1; }
.main-nav a { color: var(--text-2); font-size: 14px; }
.main-nav a:hover { color: var(--text-1); }
.search-form { position: relative; }
.search-form input {
    width: 150px;
    padding: 6px 14px;
    background: var(--bg-0);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-1);
    font-size: 13px;
    outline: none;
    transition: width .25s ease-out, border-color .2s ease-out;
}
.search-form input::placeholder { color: var(--text-3); }
.search-form input:focus { width: 190px; border-color: var(--border-strong); }
.search-form-mobile { display: none; }
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 6px; }
.nav-toggle span { display: block; width: 20px; height: 2px; background: var(--text-2); margin: 4px 0; border-radius: 1px; transition: transform .2s, opacity .2s; }

/* ---------- 主体 ---------- */
.main-content { padding: 36px 0 72px; min-height: 62vh; }

/* ---------- 文章列表 ---------- */
.post-list { display: grid; gap: 14px; }
.post-card {
    background: var(--bg-1);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px 28px;
    transition: border-color .2s ease-out, background .2s ease-out;
}
.post-card:hover { border-color: var(--border-strong); background: #303032; }
.post-title {
    font-family: var(--font-serif);
    font-size: 21px;
    line-height: 1.5;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-1);
}
.post-title a { color: var(--text-1); }
.post-title a:hover { color: #fff; }
.post-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 6px 18px;
    color: var(--text-3);
    font-size: 13px;
    margin-bottom: 10px;
}
.post-meta a { color: var(--text-3); }
.post-meta a:hover { color: var(--text-2); }
.post-excerpt { color: var(--text-2); font-size: 14px; line-height: 1.75; }

/* ---------- 单篇文章 ---------- */
.single-post {
    background: var(--bg-1);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 44px 48px;
}
.single-title {
    font-family: var(--font-serif);
    font-size: 30px;
    line-height: 1.45;
    margin-bottom: 12px;
    font-weight: 600;
    color: var(--text-1);
    letter-spacing: .01em;
}
.post-content { margin-top: 24px; font-size: 15px; color: var(--text-2); }
.post-content h2 {
    font-family: var(--font-serif);
    font-size: 22px;
    margin: 34px 0 14px;
    font-weight: 600;
    color: var(--text-1);
}
.post-content h3 {
    font-family: var(--font-serif);
    font-size: 18px;
    margin: 26px 0 10px;
    font-weight: 600;
    color: var(--text-1);
}
.post-content p { margin: 14px 0; }
.post-content img { max-width: 100%; height: auto; border-radius: var(--radius-sm); display: block; margin: 18px auto; }
.post-content pre {
    background: var(--bg-0);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 16px 18px;
    overflow-x: auto;
    margin: 18px 0;
    font-size: 13px;
    line-height: 1.7;
    font-family: var(--font-mono);
    color: var(--text-1);
}
.post-content code {
    font-family: var(--font-mono);
    background: var(--bg-2);
    color: var(--text-1);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: .88em;
}
.post-content pre code { background: none; color: inherit; padding: 0; font-size: inherit; }
.post-content blockquote {
    border-left: 2px solid var(--border-strong);
    margin: 18px 0;
    padding: 2px 18px;
    color: var(--text-2);
}
.post-content table { width: 100%; border-collapse: collapse; margin: 18px 0; font-size: 14px; }
.post-content th, .post-content td { border: 1px solid var(--border); padding: 9px 14px; text-align: left; }
.post-content th { background: var(--bg-0); color: var(--text-1); font-weight: 600; }
.post-content hr { border: none; border-top: 1px solid var(--border); margin: 28px 0; }
.post-content ul, .post-content ol { margin: 14px 0 14px 26px; }
.post-content li { margin: 6px 0; }
.post-tags {
    margin-top: 26px;
    padding-top: 18px;
    border-top: 1px solid var(--border);
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}
.post-tags a {
    font-size: 12.5px;
    color: var(--text-2);
    background: var(--bg-0);
    border: 1px solid var(--border);
    padding: 3px 12px;
    border-radius: var(--radius-sm);
    transition: border-color .2s ease-out, color .2s ease-out;
}
.post-tags a:hover { border-color: var(--border-strong); color: var(--text-1); text-decoration: none; }

/* 代码复制按钮 */
.copy-btn {
    position: absolute;
    top: 8px;
    right: 8px;
    z-index: 2;
    padding: 3px 10px;
    border: 1px solid var(--border);
    border-radius: 4px;
    background: var(--bg-2);
    color: var(--text-3);
    font-size: 11px;
    cursor: pointer;
    opacity: 0;
    transition: opacity .2s ease-out, color .2s ease-out;
}
.post-content pre:hover .copy-btn, .copy-btn.is-copied { opacity: 1; }
.copy-btn:hover { color: var(--text-1); }
.copy-btn.is-copied { color: var(--success); }

/* 上一篇/下一篇 */
.post-nav { display: flex; justify-content: space-between; gap: 14px; margin-top: 34px; padding-top: 22px; border-top: 1px solid var(--border); }
.post-nav-item {
    flex: 1;
    min-width: 0;
    display: grid;
    gap: 4px;
    padding: 14px 16px;
    background: var(--bg-0);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    transition: border-color .2s ease-out;
}
.post-nav-item:hover { border-color: var(--border-strong); text-decoration: none; }
.post-nav-next { text-align: right; }
.post-nav-item small { color: var(--text-3); font-size: 12px; }
.post-nav-item span { color: var(--text-1); font-size: 13.5px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* 相关文章 */
.related-posts { margin-top: 30px; }
.related-posts h3 { font-family: var(--font-serif); font-size: 16px; margin-bottom: 14px; font-weight: 600; color: var(--text-1); }
.related-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.related-item {
    display: grid;
    gap: 4px;
    padding: 14px 16px;
    background: var(--bg-0);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    transition: border-color .2s ease-out;
}
.related-item:hover { border-color: var(--border-strong); text-decoration: none; }
.related-item strong { color: var(--text-1); font-size: 13.5px; line-height: 1.5; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.related-item small { color: var(--text-3); font-size: 12px; }

/* ---------- 评论 ---------- */
.comments { margin-top: 36px; padding-top: 26px; border-top: 1px solid var(--border); }
.comments h3 { font-family: var(--font-serif); font-size: 16px; margin-bottom: 16px; font-weight: 600; color: var(--text-1); }
.comment-item { padding: 16px 0; border-bottom: 1px solid var(--border); }
.comment-children { margin-left: 24px; padding-left: 18px; border-left: 1px solid var(--border); }
.comment-child { border-bottom: 1px dashed var(--border); }
.comment-child:last-child { border-bottom: none; }
.comment-body strong { font-size: 14px; color: var(--text-1); }
.comment-to { color: var(--text-3); font-size: 12px; margin-left: 6px; }
.comment-to::before { content: "@"; }
.comment-time { color: var(--text-3); font-size: 12px; margin-left: 8px; }
.comment-body p { margin-top: 6px; font-size: 14px; color: var(--text-2); }
.comment-reply-btn {
    margin-top: 8px;
    padding: 2px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-0);
    color: var(--text-3);
    font-size: 12px;
    cursor: pointer;
    transition: color .2s ease-out, border-color .2s ease-out;
}
.comment-reply-btn:hover { color: var(--text-1); border-color: var(--border-strong); }
.comment-form { margin-top: 18px; }
.comment-form .form-row { display: flex; gap: 12px; margin-bottom: 12px; }
.comment-form input, .comment-form textarea {
    width: 100%;
    padding: 10px 14px;
    background: var(--bg-0);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-1);
    font-size: 14px;
    outline: none;
    font-family: inherit;
    transition: border-color .2s ease-out;
}
.comment-form input::placeholder, .comment-form textarea::placeholder { color: var(--text-3); }
.comment-form input:focus, .comment-form textarea:focus { border-color: var(--border-strong); box-shadow: 0 0 0 2px var(--accent-ring); }
.comment-form textarea { resize: vertical; margin-bottom: 12px; }
.comment-replying {
    background: var(--bg-2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 8px 14px;
    font-size: 13px;
    color: var(--text-2);
    margin-bottom: 12px;
}
.comment-replying b { color: var(--accent); }
.comment-replying a { color: var(--accent); margin-left: 8px; }

/* ---------- 按钮 ---------- */
.btn {
    display: inline-block;
    padding: 8px 20px;
    background: var(--bg-2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-1);
    font-size: 14px;
    cursor: pointer;
    text-align: center;
    transition: background .2s ease-out, color .2s ease-out, border-color .2s ease-out;
}
.btn:hover { background: #454548; border-color: var(--border-strong); text-decoration: none; color: #fff; }
.btn:active { opacity: .8; }

/* ---------- 分页 ---------- */
.pagination { display: flex; align-items: center; justify-content: center; gap: 14px; margin-top: 36px; }
.pagination a {
    padding: 7px 16px;
    background: var(--bg-1);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-2);
    font-size: 13px;
    transition: border-color .2s ease-out, color .2s ease-out;
}
.pagination a:hover { border-color: var(--border-strong); color: var(--text-1); text-decoration: none; }
.page-info { color: var(--text-3); font-size: 13px; }

/* ---------- 列表页标题 ---------- */
.list-heading { margin-bottom: 24px; }
.list-heading h1 { font-family: var(--font-serif); font-size: 24px; font-weight: 600; color: var(--text-1); }
.list-heading p { color: var(--text-3); font-size: 14px; margin-top: 4px; }

/* ---------- 归档 ---------- */
.archive-year { margin-bottom: 30px; }
.archive-year h2 { font-family: var(--font-serif); font-size: 18px; margin-bottom: 12px; font-weight: 600; color: var(--text-1); }
.archive-year h2 small { color: var(--text-3); font-size: 13px; font-weight: 400; margin-left: 6px; }
.archive-list { list-style: none; }
.archive-list li { display: flex; justify-content: space-between; gap: 12px; padding: 9px 0; border-bottom: 1px dashed var(--border); font-size: 14px; }
.archive-list a { color: var(--text-2); }
.archive-list a:hover { color: var(--text-1); }
.archive-date { color: var(--text-3); flex-shrink: 0; font-size: 13px; }

/* ---------- 标签云 ---------- */
.tag-cloud { display: flex; flex-wrap: wrap; gap: 10px 12px; align-items: center; background: var(--bg-1); border: 1px solid var(--border); border-radius: var(--radius); padding: 30px; }
.tag-item {
    color: var(--text-2);
    padding: 3px 14px;
    background: var(--bg-0);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    line-height: 1.8;
    transition: border-color .2s ease-out, color .2s ease-out;
}
.tag-item:hover { border-color: var(--border-strong); color: var(--text-1); text-decoration: none; }
.tag-item small { color: var(--text-3); font-size: 12px; }

/* ---------- 友链 ---------- */
.links-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 14px; }
.link-card {
    display: flex;
    align-items: center;
    gap: 14px;
    background: var(--bg-1);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 18px 20px;
    transition: border-color .2s ease-out, background .2s ease-out;
}
.link-card:hover { border-color: var(--border-strong); background: #303032; text-decoration: none; }
.link-logo { width: 44px; height: 44px; border-radius: var(--radius-sm); object-fit: cover; flex-shrink: 0; background: var(--bg-2); }
.link-info { min-width: 0; display: grid; gap: 2px; }
.link-info strong { color: var(--text-1); font-size: 14px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.link-info span { color: var(--text-3); font-size: 12px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* ---------- 空状态 / 404 ---------- */
.empty { text-align: center; color: var(--text-3); padding: 56px 0; }
.empty-404 { text-align: center; padding: 90px 0; }
.empty-404 h1 { font-family: var(--font-serif); font-size: 84px; font-weight: 600; color: var(--bg-2); }
.empty-404 p { color: var(--text-3); margin-bottom: 22px; }

/* ---------- 表单提示 ---------- */
.form-error {
    background: rgba(255,107,107,.08);
    color: var(--danger);
    border: 1px solid rgba(255,107,107,.25);
    border-radius: var(--radius-sm);
    padding: 10px 14px;
    font-size: 13px;
    margin-bottom: 14px;
}
.form-hint { color: var(--text-3); font-size: 12px; margin-bottom: 10px; }

/* ---------- 搜索高亮 ---------- */
mark { background: rgba(116,116,255,.25); color: var(--text-1); padding: 0 2px; border-radius: 2px; }

/* ---------- 阅读进度条 ---------- */
.reading-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 2px;
    width: 0;
    background: var(--accent);
    z-index: 999;
    transition: width .1s linear;
}

/* ---------- 返回顶部 ---------- */
.back-top {
    position: fixed;
    right: 24px;
    bottom: 28px;
    z-index: 99;
    width: 40px;
    height: 40px;
    background: var(--bg-2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-2);
    font-size: 16px;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px);
    transition: opacity .25s ease-out, visibility .25s, transform .25s ease-out, background .2s ease-out;
    box-shadow: var(--shadow-float);
}
.back-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
.back-top:hover { background: #454548; color: #fff; }

/* ---------- 页脚 ---------- */
.site-footer {
    background: var(--bg-0);
    border-top: 1px solid var(--border);
    padding: 26px 0;
    text-align: center;
    color: var(--text-3);
    font-size: 13px;
}
.site-footer a { color: var(--text-3); }
.site-footer a:hover { color: var(--text-1); }

/* ---------- 移动端 ---------- */
@media (max-width: 600px) {
    .header-inner { flex-wrap: wrap; height: auto; padding: 10px 0; gap: 6px; position: relative; }
    .logo { order: 1; }
    .nav-toggle { order: 2; display: block; margin-left: auto; }
    .header-actions { order: 3; }
    .search-form { display: none; }
    .main-nav {
        display: none;
        order: 4;
        width: 100%;
        flex-direction: column;
        gap: 0;
        background: var(--bg-1-80);
        -webkit-backdrop-filter: saturate(160%) blur(20px);
        backdrop-filter: saturate(160%) blur(20px);
        border: 1px solid var(--border);
        border-radius: var(--radius-sm);
        padding: 6px 0;
        margin-top: 4px;
        box-shadow: var(--shadow-float);
    }
    .main-nav.open { display: flex; }
    .main-nav a { padding: 11px 16px; border-bottom: 1px solid var(--border); }
    .main-nav a:last-child { border-bottom: none; }
    .search-form-mobile { display: flex; padding: 8px 14px 10px; }
    .search-form-mobile input {
        flex: 1;
        padding: 8px 12px;
        background: var(--bg-0);
        border: 1px solid var(--border);
        border-radius: var(--radius-sm);
        font-size: 14px;
        outline: none;
        color: var(--text-1);
    }
    .search-form-mobile input::placeholder { color: var(--text-3); }

    .main-content { padding: 22px 0 56px; }
    .container { padding: 0 16px; }
    .post-card { padding: 20px 18px; }
    .post-title { font-size: 18px; }
    .single-post { padding: 24px 18px; }
    .single-title { font-size: 23px; }
    .related-grid { grid-template-columns: 1fr; }
    .post-nav { flex-direction: column; }
    .post-nav-next { text-align: left; }
    .comment-children { margin-left: 10px; padding-left: 10px; }
    .comment-form .form-row { flex-direction: column; gap: 10px; }
    .back-top { right: 14px; bottom: 18px; width: 36px; height: 36px; font-size: 15px; }
    .tag-cloud { padding: 20px; }
    .empty-404 h1 { font-size: 64px; }
}

/* ---------- 无障碍：减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { transition: none !important; animation: none !important; }
    html { scroll-behavior: auto; }
}

/* ---------- 导航当前页高亮 ---------- */
.nav-link { position: relative; }
.nav-link.is-active { color: var(--text-1); }
.nav-link.is-active::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: -18px;
    height: 2px;
    background: var(--text-1);
    border-radius: 1px;
}

/* ---------- 卡片日期（等宽） ---------- */
.post-date {
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: .02em;
}

/* ---------- 页脚布局 ---------- */
.footer-inner { display: grid; gap: 14px; justify-items: center; }
.footer-brand { display: grid; gap: 2px; justify-items: center; }
.footer-logo { font-family: var(--font-serif); font-size: 18px; font-weight: 600; color: var(--text-1); }
.footer-desc { color: var(--text-3); font-size: 12px; }
.footer-nav { display: flex; gap: 18px; flex-wrap: wrap; justify-content: center; }
.footer-nav a { color: var(--text-3); font-size: 13px; transition: color .2s ease-out; }
.footer-nav a:hover { color: var(--text-1); }
.footer-copy { color: var(--text-3); font-size: 12px; }
.footer-copy a { color: var(--text-3); }
.footer-copy a:hover { color: var(--text-1); }

/* 移动端导航高亮调整（下拉菜单内不显示底部线） */
@media (max-width: 600px) {
    .nav-link.is-active::after { display: none; }
    .nav-link.is-active { color: var(--accent); }
}