/* ==========================================================================
   Aurora · 极光极简 模板样式
   风格：飞之梦技术笔记 · 科技蓝 (tech-blue)
   主色 #4e73df / 深蓝 #224abe / 底 #f8f9fc / 边框 #e3e6f0
   卡片白底 · 圆角 0.35rem · 焦点环 · prefers-reduced-motion 降级 · 响应式
   ========================================================================== */

/* ---------- 设计令牌 ---------- */
:root {
    --primary: #4e73df;
    --primary-dark: #224abe;
    --primary-soft: #e0e7ff;
    --bg: #f8f9fc;
    --card: #ffffff;
    --border: #e3e6f0;
    --border-light: #eaecf4;
    --text: #3a3b45;
    --gray-700: #495057;
    --gray-500: #858796;
    --gray-800: #3a3b45;
    --success: #1cb144;
    --radius: 0.35rem;
    --shadow: 0 2px 6px 0 rgba(58, 59, 69, 0.06);
    --shadow-lg: 0 0.5rem 2rem 0 rgba(58, 59, 69, 0.15);
    --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    --header-nav-h: 50px;
    --container-w: 1140px;
    --sidebar-w: 300px;
}

/* ---------- 基础 ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: var(--font);
    font-size: 16px;
    line-height: 1.7;
    color: var(--text);
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--primary); text-decoration: none; transition: color .15s ease; }
a:hover { color: var(--primary-dark); }
h1, h2, h3, h4, h5, h6 { margin: 0 0 .5em; line-height: 1.35; font-weight: 700; color: var(--gray-800); }
p { margin: 0 0 1em; }
ul, ol { margin: 0 0 1em; padding-left: 1.4em; }

.container { width: 100%; max-width: var(--container-w); margin: 0 auto; padding: 0 1.5rem; }

/* 键盘焦点环（无障碍） */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible,
[tabindex]:focus-visible {
    outline: 3px solid rgba(78, 115, 223, .40);
    outline-offset: 2px;
    border-radius: 4px;
}
.visually-hidden {
    position: absolute; width: 1px; height: 1px;
    margin: -1px; padding: 0; overflow: hidden;
    clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

/* ==========================================================================
   头部（两行：品牌栏 + 导航）
   ========================================================================== */
.site-header { background: #fff; }

/* ---- 品牌栏 ---- */
.brand-bar {
    padding: 0.85rem 0;
    border-bottom: 1px solid var(--border-light);
    background-color: #fff;
}
.brand-container {
    max-width: var(--container-w);
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
    justify-content: flex-start;
}
.brand {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 800;
    font-size: 1.3rem;
    color: var(--primary);
    letter-spacing: 0.5px;
    text-align: left;
}
.brand:hover { color: var(--primary-dark); }
.brand-logo { height: 34px; width: auto; display: block; }
.brand-name { line-height: 1.2; }
.brand-sep {
    display: inline-block;
    width: 1px; height: 20px;
    background: var(--border);
}
.brand-sub {
    color: var(--gray-500);
    font-size: 0.85rem;
    max-width: 480px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    text-align: left;
}
.brand-status {
    margin-left: auto;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.78rem;
    color: var(--gray-500);
}
.status-dot {
    width: 8px; height: 8px;
    background-color: var(--success);
    border-radius: 50%;
    position: relative;
    animation: status-pulse 2s infinite;
}
.status-dot::after {
    content: '';
    position: absolute; inset: -3px;
    border-radius: 50%;
    border: 2px solid var(--success);
    opacity: 0;
    animation: status-pulse-ring 2s infinite;
}
.status-text { font-weight: 600; letter-spacing: 0.5px; }
@keyframes status-pulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(28, 177, 68, .5); }
    50% { box-shadow: 0 0 0 4px rgba(28, 177, 68, 0); }
}
@keyframes status-pulse-ring {
    0% { transform: scale(.8); opacity: .8; }
    100% { transform: scale(1.6); opacity: 0; }
}

/* ---- 导航 ---- */
.nav-bar {
    background-color: #fff;
    border-bottom: 1px solid var(--border-light);
    position: sticky;
    top: 0;
    z-index: 50;
}
.nav-inner {
    max-width: var(--container-w);
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: var(--header-nav-h);
    gap: 12px;
}
.nav-list {
    display: flex;
    align-items: center;
    gap: 4px;
    list-style: none;
    margin: 0;
    padding: 0;
    flex: 1;
}
.nav-item { position: relative; }
.nav-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 0.6rem 0.9rem;
    border-radius: 0.35rem;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--gray-800);
}
.nav-link:hover { background: var(--primary-soft); color: var(--primary); }
.nav-link[aria-current="page"] { color: var(--primary); }
.nav-dropdown { position: relative; }
.dropdown-menu {
    position: absolute;
    top: calc(100% + 6px);
    left: 0;
    min-width: 170px;
    padding: 6px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 0.4rem;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-6px);
    transition: opacity .15s ease, transform .15s ease, visibility .15s;
    list-style: none;
    margin: 0;
    z-index: 60;
}
.nav-dropdown:hover .dropdown-menu,
.nav-dropdown:focus-within .dropdown-menu {
    opacity: 1; visibility: visible; transform: translateY(0);
}
.dropdown-menu a {
    display: block;
    padding: 0.5rem 0.7rem;
    border-radius: 0.3rem;
    color: var(--gray-800);
    font-size: 0.9rem;
}
.dropdown-menu a:hover { background: var(--primary-soft); color: var(--primary); }

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: 1px solid var(--border);
    padding: 8px;
    border-radius: 0.35rem;
    cursor: pointer;
}
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--gray-800); border-radius: 2px; transition: transform .2s ease, opacity .2s ease; }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
.nav-overlay {
    position: fixed; inset: 0;
    background: rgba(58, 59, 69, .4);
    opacity: 0; visibility: hidden;
    transition: opacity .2s ease;
    z-index: 45;
}

/* ==========================================================================
   首页 Hero（格言 + 搜索）
   ========================================================================== */
.home-hero {
    padding: 80px 0 140px;
    background:
        radial-gradient(42% 90% at 20% 10%, rgba(34, 74, 190, .55), transparent 60%),
        radial-gradient(36% 80% at 82% 15%, rgba(78, 115, 223, .45), transparent 60%),
        linear-gradient(135deg, #2b4fc0 0%, #4e73df 60%, #6a8dee 100%);
    color: #fff;
}
.hero-quote {
    font-size: 1.6rem;
    font-weight: 600;
    text-align: center;
    margin: 0;
    letter-spacing: 1px;
}
.hero-search {
    margin-top: 60px;
    max-width: 560px;
    margin-left: auto;
    margin-right: auto;
}
.hero-search-form {
    display: flex;
    align-items: center;
    gap: 0;
    background: #fff;
    border-radius: 0.5rem;
    box-shadow: 0 8px 24px rgba(34, 74, 190, .25);
    overflow: hidden;
}
.hero-search-form input {
    flex: 1;
    min-width: 0;
    padding: 0.9rem 1.1rem;
    border: 0;
    font-family: inherit;
    font-size: 0.95rem;
    color: var(--gray-800);
    background: transparent;
}
.hero-search-form input:focus { outline: none; }
.hero-search-form .btn-search {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 0.9rem 1.2rem;
    border: 0;
    background: var(--primary);
    color: #fff;
    font-family: inherit;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
}
.hero-search-form .btn-search:hover { background: var(--primary-dark); }
.hero-search-form svg { width: 16px; height: 16px; }

/* ==========================================================================
   首页：栏目卡片网格
   ========================================================================== */
.home-categories { padding: 2rem 0 3rem; }
.home-section-header { margin-bottom: 1.6rem; }
.home-section-title { font-size: 1.5rem; font-weight: 800; margin: 0; }
.home-section-title::before {
    content: "";
    display: inline-block;
    width: 6px; height: 22px;
    margin-right: 10px;
    border-radius: 3px;
    vertical-align: -3px;
    background: linear-gradient(180deg, var(--primary), var(--primary-dark));
}
.cat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.cat-col { display: block; }

.home-category-card {
    display: block;
    background-color: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform .15s ease-in-out, box-shadow .15s ease-in-out;
    height: 100%;
    color: var(--gray-800);
    position: relative;
}
.home-category-card:hover {
    text-decoration: none;
    color: var(--gray-800);
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}
.cat-corner { display: none; }
.home-category-cover { position: relative; }
.home-category-cover img { width: 100%; height: 170px; object-fit: cover; }
.home-category-cover-overlay { display: none; }
.home-category-count-badge {
    position: absolute; top: 0; right: 0;
    font-size: 0.75rem;
    color: #fff;
    background-color: var(--primary);
    padding: 0.2rem 0.6rem;
    font-weight: 600;
    border-bottom-left-radius: 0.35rem;
}
.home-category-info { padding: 1.1rem 1.2rem; }
.home-category-name { font-size: 1.05rem; font-weight: 700; margin-bottom: 0.4rem; color: var(--gray-800); }
.home-category-desc {
    font-size: 0.84rem;
    color: var(--gray-500);
    margin-bottom: 0.7rem;
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.home-category-arrow { font-size: 0.82rem; color: var(--primary); font-weight: 600; }

/* 默认栏目封面渐变占位 */
.cat-cover-fallback {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 170px;
    background: linear-gradient(135deg, #4e73df, #6a8dee);
}
.cat-cover-fallback .cat-letter { font-size: 3rem; font-weight: 800; color: rgba(255, 255, 255, .85); }

/* ==========================================================================
   主体布局
   ========================================================================== */
.layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) var(--sidebar-w);
    gap: 1.5rem;
    padding: 2rem 0 3rem;
}
.layout-main { min-width: 0; }

/* 列表页标题 */
.list-head { margin: 0.4rem 0 1.2rem; }
.list-title { font-size: 1.4rem; font-weight: 800; margin: 0; }
.list-title::before {
    content: "";
    display: inline-block;
    width: 6px; height: 20px;
    margin-right: 10px;
    border-radius: 3px;
    vertical-align: -2px;
    background: linear-gradient(180deg, var(--primary), var(--primary-dark));
}

/* ==========================================================================
   文章列表卡片
   ========================================================================== */
.article-card {
    background-color: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    margin-bottom: 1.5rem;
    overflow: hidden;
    transition: transform .15s ease-in-out, box-shadow .15s ease-in-out;
}
.article-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }

.article-compare { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; padding: 14px 14px 0; }
.article-compare figure { margin: 0; position: relative; border-radius: var(--radius); overflow: hidden; background: #e9ecf3; }
.article-compare img { width: 100%; height: 150px; object-fit: cover; }
.article-compare figcaption {
    position: absolute; left: 0; right: 0; bottom: 0;
    padding: 20px 8px 6px;
    background: linear-gradient(transparent, rgba(58, 59, 69, .7));
    color: #fff; font-size: 0.72rem; font-weight: 600; text-align: center;
}
.fig-before { color: #f6c23e; }
.fig-after { color: #1cc88a; }

.article-card-body { padding: 1.1rem 1.2rem; }
.article-card-title { font-size: 1.15rem; font-weight: 700; margin: 0 0 0.5rem; }
.article-card-title a { color: var(--gray-800); }
.article-card-title a:hover { color: var(--primary); }
.top-flag {
    display: inline-flex;
    align-items: center;
    font-size: 0.72rem;
    font-weight: 600;
    color: #fff;
    background: var(--primary);
    padding: 2px 8px;
    border-radius: 0.3rem;
    margin-right: 8px;
    vertical-align: 2px;
}
.article-card-excerpt { color: var(--gray-500); font-size: 0.9rem; margin: 0 0 0.8rem; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }

.article-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 12px;
    font-size: 0.82rem;
    color: var(--gray-500);
}
.article-meta svg { width: 14px; height: 14px; vertical-align: -2px; margin-right: 4px; }
.meta-author a { font-weight: 600; color: var(--primary); }
.meta-stat { display: inline-flex; align-items: center; }
.list-sort { color: var(--primary); font-weight: 600; }

.article-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 0.8rem; }
.article-tags a {
    font-size: 0.75rem;
    color: var(--gray-500);
    background: var(--bg);
    padding: 3px 10px;
    border-radius: 999px;
    border: 1px solid var(--border);
}
.article-tags a:hover { color: var(--primary); border-color: var(--primary); }

.empty-tip { padding: 48px 20px; text-align: center; color: var(--gray-500); }

/* ---------- 分页 ---------- */
.pagination { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 8px; margin-top: 8px; }
.pagination a,
.pagination .page-cur,
.pagination .page-ellipsis {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 38px;
    height: 38px;
    padding: 0 11px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    background: var(--card);
    color: var(--gray-800);
    font-size: 0.9rem;
}
.pagination a:hover { border-color: var(--primary); color: var(--primary); }
.pagination .page-cur { background: var(--primary); color: #fff; border-color: transparent; font-weight: 600; }
.pagination .page-ellipsis { border: 0; background: none; }

/* ==========================================================================
   文章详情
   ========================================================================== */
.article {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 2rem 2.2rem;
}
.article-header { margin-bottom: 1.4rem; }
.article-title { font-size: 1.6rem; font-weight: 800; line-height: 1.3; margin: 0 0 0.9rem; }
.article-metabar { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; font-size: 0.83rem; color: var(--gray-500); }
.article-metabar .meta-item { display: inline-flex; align-items: center; gap: 5px; }
.article-metabar svg { width: 14px; height: 14px; }
.article-metabar a { color: var(--primary); font-weight: 600; }
.edit-link { color: var(--gray-500); }
.edit-link:hover { color: var(--primary); }

.article-cover { border-radius: var(--radius); overflow: hidden; margin-bottom: 1.4rem; }
.article-cover img { width: 100%; }

/* 服务信息条 */
.service-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    padding: 12px 16px;
    margin-bottom: 1.4rem;
    background: var(--primary-soft);
    border: 1px solid rgba(78, 115, 223, .25);
    border-radius: var(--radius);
    font-size: 0.9rem;
}
.service-bar .s-item { display: inline-flex; align-items: center; gap: 6px; color: var(--gray-800); }
.service-bar .s-item b { color: var(--primary-dark); font-weight: 700; }

/* 前后对比大图区 */
.compare-section { margin-bottom: 1.6rem; }
.compare-title { display: flex; align-items: center; gap: 8px; font-size: 1.1rem; font-weight: 700; margin-bottom: 0.9rem; }
.compare-title svg { width: 20px; height: 20px; color: var(--primary); }
.compare-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.compare-card { border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; background: var(--card); }
.compare-card img { width: 100%; height: 300px; object-fit: cover; }
.compare-card .compare-label { display: flex; align-items: center; gap: 8px; padding: 10px 14px; font-size: 0.9rem; font-weight: 700; }
.compare-label .dot { width: 10px; height: 10px; border-radius: 50%; }
.compare-before .dot { background: #f6c23e; box-shadow: 0 0 0 3px rgba(246, 194, 62, .2); }
.compare-after .dot { background: #1cc88a; box-shadow: 0 0 0 3px rgba(28, 200, 138, .2); }

.article-content { line-height: 1.9; font-size: 1rem; color: var(--gray-800); }
.article-content h2, .article-content h3, .article-content h4 { margin-top: 1.6em; }
.article-content img { border-radius: var(--radius); }
.article-content a { text-decoration: underline; text-underline-offset: 3px; }
.article-content blockquote {
    margin: 1.4em 0;
    padding: 4px 18px;
    border-left: 4px solid var(--primary);
    background: var(--bg);
    color: var(--gray-700);
    border-radius: 0 var(--radius) var(--radius) 0;
}
.article-content pre {
    padding: 16px;
    background: #2d3748;
    color: #e2e8f0;
    border-radius: var(--radius);
    overflow-x: auto;
    font-size: 0.85rem;
    line-height: 1.6;
}
.article-content code { font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace; font-size: .9em; }
.article-content pre code { background: none; color: inherit; padding: 0; }
.article-content table { width: 100%; border-collapse: collapse; margin: 1.2em 0; }
.article-content th, .article-content td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; }
.article-content th { background: var(--bg); font-weight: 600; }

.article-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin: 1.8rem 0; padding-top: 1.2rem; border-top: 1px solid var(--border); }
.article-nav a { display: block; padding: 14px 16px; background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius); color: var(--gray-800); font-size: 0.9rem; }
.article-nav a:hover { border-color: var(--primary); }
.article-nav .nav-dir { font-size: 0.75rem; color: var(--gray-500); display: block; margin-bottom: 4px; }
.article-nav .next { text-align: right; }

/* ---------- 评论 ---------- */
.comment-section { margin-top: 1.2rem; }
.comment-count { font-size: 1.1rem; font-weight: 700; margin-bottom: 1.1rem; }
.comment { display: flex; gap: 12px; padding: 16px 0; border-bottom: 1px solid var(--border); }
.comment-avatar { flex: none; width: 42px; height: 42px; border-radius: 50%; overflow: hidden; background: var(--bg); }
.comment-avatar img { width: 100%; height: 100%; object-fit: cover; }
.comment-body { flex: 1; min-width: 0; }
.comment-head { display: flex; align-items: baseline; gap: 8px; flex-wrap: wrap; }
.comment-author { font-weight: 700; color: var(--gray-800); font-size: 0.95rem; }
.comment-date { font-size: 0.75rem; color: var(--gray-500); }
.comment-content { color: var(--gray-800); font-size: 0.95rem; margin-top: 4px; word-break: break-word; }
.comment-children { margin-left: 40px; }
.comment-reply-btn { background: none; border: 0; color: var(--gray-500); font-size: 0.8rem; cursor: pointer; padding: 0; margin-top: 6px; }
.comment-reply-btn:hover { color: var(--primary); }

.comment-form-wrap { margin-top: 1.4rem; }
.comment-form-wrap form { display: flex; flex-direction: column; gap: 12px; }
.comment-form-wrap textarea,
.comment-form-wrap input[type="text"],
.comment-form-wrap input[type="email"],
.comment-form-wrap input[type="url"] {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-family: inherit;
    font-size: 0.95rem;
    color: var(--gray-800);
    background: var(--bg);
    transition: border-color .15s ease, box-shadow .15s ease;
}
.comment-form-wrap textarea:focus,
.comment-form-wrap input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(78, 115, 223, .15);
}
.comment-form-wrap textarea { min-height: 110px; resize: vertical; }
.comment-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.comment-actions { display: flex; gap: 10px; align-items: center; }

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 9px 18px;
    border: 0;
    border-radius: var(--radius);
    font-family: inherit;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    color: #fff;
    background: var(--primary);
    box-shadow: 0 2px 6px rgba(78, 115, 223, .3);
    transition: background .15s ease, transform .15s ease;
}
.btn:hover { background: var(--primary-dark); transform: translateY(-1px); }
.btn-ghost { background: var(--bg); color: var(--gray-500); border: 1px solid var(--border); box-shadow: none; }
.btn-ghost:hover { color: var(--gray-800); background: var(--bg); }
.captcha { display: flex; align-items: center; gap: 10px; }

/* ==========================================================================
   侧边栏 widget
   ========================================================================== */
.widget {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1.1rem;
    margin-bottom: 1.1rem;
}
.widget-title { font-size: 1rem; font-weight: 700; margin-bottom: 0.8rem; padding-bottom: 0.6rem; border-bottom: 1px solid var(--border); }
.widget ul { list-style: none; margin: 0; padding: 0; }
.widget li { padding: 6px 0; font-size: 0.9rem; }
.widget li a { color: var(--gray-800); }
.widget li a:hover { color: var(--primary); }

.widget-blogger { text-align: center; }
.blogger-avatar { width: 84px; height: 84px; margin: 0 auto 12px; border-radius: 50%; overflow: hidden; border: 3px solid var(--primary); box-shadow: 0 4px 12px rgba(78, 115, 223, .3); }
.blogger-avatar img { width: 100%; height: 100%; object-fit: cover; }
.blogger-name { font-weight: 700; font-size: 1rem; margin-bottom: 4px; }
.blogger-desc { font-size: 0.82rem; color: var(--gray-500); }

.tag-cloud { display: flex; flex-wrap: wrap; gap: 6px; }
.tag-cloud a { font-size: 0.8rem; color: var(--gray-500); background: var(--bg); border: 1px solid var(--border); padding: 3px 10px; border-radius: 999px; }
.tag-cloud a:hover { color: var(--primary); border-color: var(--primary); }

.search-form { display: flex; gap: 8px; }
.search-form input { flex: 1; min-width: 0; padding: 8px 12px; border: 1px solid var(--border); border-radius: var(--radius); font-family: inherit; font-size: 0.9rem; background: var(--bg); color: var(--gray-800); }
.search-form input:focus { outline: none; border-color: var(--primary); }
.archive-select { width: 100%; padding: 8px 12px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg); font-family: inherit; font-size: 0.9rem; color: var(--gray-800); }

/* ==========================================================================
   页脚
   ========================================================================== */
.site-footer { border-top: 1px solid var(--border); background: var(--card); padding: 1.6rem 0; margin-top: 8px; }
.footer-inner { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px; font-size: 0.82rem; color: var(--gray-500); }
.footer-inner a { color: var(--gray-500); }
.footer-inner a:hover { color: var(--primary); }
.footer-icp a { text-decoration: underline; text-underline-offset: 2px; }

/* 返回顶部 */
.back-top {
    position: fixed; right: 22px; bottom: 22px;
    width: 44px; height: 44px;
    display: grid; place-items: center;
    border-radius: var(--radius);
    background: var(--card);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
    color: var(--primary);
    cursor: pointer;
    opacity: 0; visibility: hidden;
    transform: translateY(8px);
    transition: opacity .2s ease, transform .2s ease, visibility .2s;
    z-index: 40;
}
.back-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
.back-top:hover { color: var(--primary-dark); }
.back-top svg { width: 20px; height: 20px; }

/* Pjax 加载指示 */
.pjax-progress { position: fixed; top: 0; left: 0; height: 3px; width: 0; background: linear-gradient(90deg, var(--primary), var(--primary-dark)); z-index: 100; opacity: 0; transition: opacity .2s ease, width .3s ease; }
.pjax-progress.active { opacity: 1; }

/* 图片占位微光 */
img.lazy-placeholder { background: linear-gradient(110deg, #e9ecf3 8%, #f8f9fc 18%, #e9ecf3 33%); background-size: 200% 100%; }
@media (prefers-reduced-motion: reduce) { img.lazy-placeholder { background: #e9ecf3; } }

/* ==========================================================================
   404
   ========================================================================== */
.error-page { text-align: center; padding: 80px 20px; }
.error-code { font-size: 88px; font-weight: 800; line-height: 1; color: var(--primary); }
.error-text { color: var(--gray-500); margin: 16px 0 24px; }

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width: 991px) {
    .cat-grid { grid-template-columns: repeat(2, 1fr); }
    .layout { grid-template-columns: 1fr; }
    .sidebar { display: grid; grid-template-columns: 1fr 1fr; gap: 1.1rem; }
    .sidebar .widget { margin-bottom: 0; }
}
@media (max-width: 767px) {
    .home-hero { padding: 60px 0 100px; }
    .hero-quote { font-size: 1.3rem; }
    .brand-sub { display: none; }
    .article { padding: 1.3rem 1.1rem; }
    .article-title { font-size: 1.3rem; }
    .compare-grid { grid-template-columns: 1fr; }
    .compare-card img { height: 220px; }
    .comment-row { grid-template-columns: 1fr; }
    .article-nav { grid-template-columns: 1fr; }
    .article-nav .next { text-align: left; }
    .sidebar { grid-template-columns: 1fr; }

    .nav-list { display: none; }
    .nav-toggle { display: flex; }
    .nav-inner.open .nav-list {
        display: flex;
        flex-direction: column;
        align-items: stretch;
        gap: 2px;
        position: absolute;
        top: 100%; left: 0; right: 0;
        background: var(--card);
        border-bottom: 1px solid var(--border);
        padding: 10px 16px 16px;
        box-shadow: var(--shadow-lg);
        z-index: 46;
        max-height: calc(100vh - var(--header-nav-h));
        overflow-y: auto;
    }
    .nav-inner.open .dropdown-menu { position: static; opacity: 1; visibility: visible; transform: none; box-shadow: none; border: 0; padding: 0 0 0 14px; }
}
@media (max-width: 480px) {
    .cat-grid { grid-template-columns: 1fr; }
    .article-compare { grid-template-columns: 1fr; }
    .article-compare img { height: 130px; }
    .brand-status { display: none; }
}