/* theme-tech-v1 · tech 行业 · v1 蓝白简约版
   BEM 命名 + CSS 变量 + 暗黑模式 + 响应式（构建时静态 CSS，零 CDN 运行时依赖）
   色板规范（对齐行业模板色板 v1）：
     品牌主色 #3B82F6 · 品牌浅色 #e0f2fe · 品牌深色 #1D4ED8
     浅色：背景 #F8FAFC / 卡片 #FFFFFF / 主标题 #0F172A / 正文 #334155 / 辅助 #64748B / 弱化 #94A3B8 / 边框 #E2E8F0
     深色：背景 #0B1220 / 卡片 #111827 / 主文字 #F8FAFC / 正文 #CBD5E1 / 辅助 #94A3B8 / 边框 #1E293B
     深色模式品牌统一提亮为浅色 #60A5FA（深底上的可读性），品牌文字色 #fff 恒等 */
:root {
  --v1-bg: #f8fafc;
  --v1-surface: #ffffff;
  --v1-title: #0f172a;
  --v1-body: #334155;
  --v1-muted: #64748b;
  --v1-faint: #94a3b8;
  --v1-line: #e2e8f0;
  --v1-brand: #3B82F6;
  --v1-brand-dark: #1D4ED8;
  --v1-brand-soft: #e0f2fe;
  --v1-radius: 10px;
  --v1-shadow: 0 1px 2px rgba(30, 41, 59, 0.06);
  --v1-shadow-hover: 0 8px 20px rgba(30, 41, 59, 0.1);
  --v1-font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --v1-font-serif: "Noto Serif SC", "Songti SC", serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --v1-bg: #0b1220; --v1-surface: #111827; --v1-title: #f8fafc; --v1-body: #cbd5e1; --v1-muted: #94a3b8; --v1-faint: #64748b; --v1-line: #1e293b;
    --v1-brand: #60a5fa; --v1-brand-dark: #3b82f6; --v1-brand-soft: #26303f;
    --v1-shadow: 0 1px 2px rgba(0,0,0,0.4); --v1-shadow-hover: 0 8px 20px rgba(0,0,0,0.5);
  }
}
[data-theme="dark"] {
  --v1-bg: #0b1220; --v1-surface: #111827; --v1-title: #f8fafc; --v1-body: #cbd5e1; --v1-muted: #94a3b8; --v1-faint: #64748b; --v1-line: #1e293b;
  --v1-brand: #60a5fa; --v1-brand-dark: #3b82f6; --v1-brand-soft: #26303f;
  --v1-shadow: 0 1px 2px rgba(0,0,0,0.4); --v1-shadow-hover: 0 8px 20px rgba(0,0,0,0.5);
}
[data-theme="light"] {
  --v1-bg: #f8fafc; --v1-surface: #ffffff; --v1-title: #0f172a; --v1-body: #334155; --v1-muted: #64748b; --v1-faint: #94a3b8; --v1-line: #e2e8f0;
  --v1-brand: #3B82F6; --v1-brand-dark: #1D4ED8; --v1-brand-soft: #e0f2fe;
  --v1-shadow: 0 1px 2px rgba(30, 41, 59, 0.06); --v1-shadow-hover: 0 8px 20px rgba(30, 41, 59, 0.1);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: var(--v1-font-sans); background: var(--v1-bg); color: var(--v1-body); line-height: 1.7; -webkit-text-size-adjust: 100%; }
img { max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
.container { max-width: 1080px; margin: 0 auto; padding: 0 20px; }
.mt-0 { margin-top: 0 !important; }
#main-content { max-width: 1080px; margin: 0 auto; }
:focus-visible { outline: 2px solid var(--v1-brand); outline-offset: 2px; }

/* 头部 */
.site-header { position: sticky; top: 0; z-index: 50; background: var(--v1-surface); border-bottom: 1px solid var(--v1-line); }
.site-header__inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 60px; }
.site-logo { display: flex; align-items: center; gap: 10px; }
.site-logo__img { display: inline-block; height: 32px; width: auto; max-width: 200px; object-fit: contain; }
/* 深色变体：站点配置了 logo_dark_path 时，默认（深色主题）显示深色图、[data-theme=light] 切换浅色图。 */
.site-logo__img--dark { display: none; }
[data-theme="light"] .site-logo__img { display: none; }
[data-theme="light"] .site-logo__img--dark { display: inline-block; }
.site-logo__mark { display: inline-flex; align-items: center; justify-content: center; width: 32px; height: 32px; border-radius: 8px; background: var(--v1-brand); color: #fff; font-weight: 700; font-size: 15px; }
.site-logo__text { font-weight: 700; font-size: 17px; letter-spacing: 0.02em; }
.site-nav { display: flex; align-items: center; gap: 22px; }
.site-nav__link { color: var(--v1-muted); font-size: 15px; padding: 6px 2px; }
.site-nav__link:hover { color: var(--v1-title); }
.site-nav__link.is-active { color: var(--v1-brand); font-weight: 600; border-bottom: 2px solid var(--v1-brand); }
.site-header__actions { display: flex; align-items: center; gap: 12px; }
.site-search { display: flex; }
.site-search__input { width: 170px; padding: 7px 12px; font-size: 14px; border: 1px solid var(--v1-line); border-radius: 6px 0 0 6px; background: var(--v1-bg); color: var(--v1-body); outline: none; }
.site-search__input:focus { border-color: var(--v1-brand); width: 210px; }
.site-search__btn { padding: 0 14px; border: none; background: var(--v1-brand); color: #fff; font-size: 14px; border-radius: 0 6px 6px 0; cursor: pointer; }
.theme-toggle { width: 34px; height: 34px; border: 1px solid var(--v1-line); border-radius: 8px; background: var(--v1-bg); cursor: pointer; font-size: 15px; }
/* 主题切换图标显隐：默认（无 data-theme，JS 未运行）显示 🌙；light 只显 ☀️；dark 只显 🌙。 */
.theme-toggle__icon--light { display: none; }
[data-theme="light"] .theme-toggle__icon--light { display: inline; }
[data-theme="light"] .theme-toggle__icon--dark { display: none; }
[data-theme="dark"] .theme-toggle__icon--dark { display: inline; }
.nav-toggle { display: none; background: none; border: none; font-size: 22px; color: var(--v1-title); cursor: pointer; }

/* 首页 */
.hero { border-bottom: 1px solid var(--v1-line); }
.hero__inner { padding: 48px 20px 42px; text-align: center; }
.hero__eyebrow { color: var(--v1-brand); font-size: 13px; font-weight: 600; letter-spacing: 0.08em; margin-bottom: 10px; }
.hero__title { font-family: var(--v1-font-serif); font-size: 30px; font-weight: 700; margin-bottom: 12px; line-height: 1.3; }
.hero__desc { color: var(--v1-muted); max-width: 600px; margin: 0 auto; font-size: 15px; }
.section { padding: 40px 20px; }
.section__head { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 20px; }
.section__title { font-family: var(--v1-font-serif); font-size: 19px; font-weight: 600; }
.section__more { color: var(--v1-brand); font-size: 14px; }
.section__more:hover { text-decoration: underline; }
.section__desc { color: var(--v1-muted); font-size: 14px; margin-bottom: 20px; }
.grid { display: grid; gap: 18px; }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }
.chips { display: flex; flex-wrap: wrap; gap: 10px; }
.chip { display: inline-block; padding: 6px 14px; font-size: 13px; background: var(--v1-brand-soft); color: var(--v1-brand); border-radius: 999px; }
.chip:hover { background: var(--v1-brand); color: #fff; }

/* 卡片 */
.card { background: var(--v1-surface); border: 1px solid var(--v1-line); border-radius: var(--v1-radius); overflow: hidden; box-shadow: var(--v1-shadow); transition: box-shadow 0.2s, transform 0.2s; }
.card:hover { box-shadow: var(--v1-shadow-hover); transform: translateY(-2px); }
.card__media { aspect-ratio: 16/10; background: var(--v1-brand-soft) center/cover no-repeat; }
.card__media img { width: 100%; height: 100%; object-fit: cover; display: block; }
.card__media--blank { display: flex; align-items: center; justify-content: center; color: var(--v1-muted); font-size: 28px; }
.card__body { padding: 14px 16px; }
.card__title { font-family: var(--v1-font-serif); font-size: 16px; font-weight: 600; line-height: 1.5; }
.card:hover .card__title { color: var(--v1-brand); }
.card__excerpt { margin: 8px 0 0; color: var(--v1-muted); font-size: 13px; }
.card__meta { margin: 10px 0 0; font-size: 12px; color: var(--v1-faint); }

/* 列表/布局 */
.breadcrumb { display: flex; align-items: center; gap: 8px; color: var(--v1-muted); font-size: 13px; margin: 18px 0 20px; }
.breadcrumb a:hover { color: var(--v1-brand); }
.breadcrumb__sep { opacity: 0.5; }
.layout { display: grid; grid-template-columns: minmax(0, 1fr) 280px; gap: 28px; padding: 0 20px 48px; }
.list-item { display: flex; gap: 16px; padding: 16px; margin-bottom: 16px; }
.list-item__media { width: 168px; flex-shrink: 0; aspect-ratio: 4/3; border-radius: 8px; }
.list-item__body { flex: 1; min-width: 0; }
.list-item__title { font-family: var(--v1-font-serif); font-size: 17px; font-weight: 600; margin-bottom: 6px; }
.list-item:hover .list-item__title { color: var(--v1-brand); }
.list-item__excerpt { color: var(--v1-muted); font-size: 14px; margin-bottom: 8px; }
.list-item__meta { color: var(--v1-faint); font-size: 12px; }
.sidebar { display: flex; flex-direction: column; gap: 20px; }
.sidebar__panel { padding: 18px; }
.sidebar__title { font-family: var(--v1-font-serif); font-size: 15px; font-weight: 600; margin-bottom: 12px; }
.sidebar__list { list-style: none; display: flex; flex-direction: column; gap: 10px; font-size: 14px; }
.sidebar__list a { color: var(--v1-muted); }
.sidebar__list a:hover { color: var(--v1-brand); }

/* 文章 */
.article-wrap { margin: 0 auto; padding: 0 20px 52px; }
.article-header { padding: 28px 0 6px; }
.article-header__title { font-family: var(--v1-font-serif); font-size: 28px; font-weight: 700; line-height: 1.4; margin-bottom: 10px; }
.article-header__meta { display: flex; flex-wrap: wrap; gap: 12px; color: var(--v1-muted); font-size: 13px; }
.article-header__meta span::before { content: "·"; margin-right: 12px; color: var(--v1-line); }
.article-header__meta span:first-child::before { content: ""; margin: 0; }
.article-cover { aspect-ratio: 16/9; border-radius: var(--v1-radius); background: var(--v1-brand-soft) center/cover no-repeat; margin: 22px 0; }
.article-body { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 28px; align-items: start; }
.article-toc { background: var(--v1-surface); border: 1px solid var(--v1-line); border-radius: 8px; padding: 14px 18px; position: sticky; top: 24px; max-height: calc(100vh - 48px); overflow: auto; }
.article-toc__title { font-weight: 600; font-size: 14px; margin-bottom: 8px; }
.article-toc__list { list-style: none; display: flex; flex-direction: column; gap: 6px; font-size: 13px; }
.article-toc__list a { color: var(--v1-muted); display: block; }
.article-toc__list a:hover { color: var(--v1-brand); }
.prose-content { font-size: 16px; line-height: 1.9; }
.prose-content h2 { font-family: var(--v1-font-serif); font-size: 22px; font-weight: 700; margin: 32px 0 14px; padding-left: 12px; border-left: 4px solid var(--v1-brand); }
.prose-content h3 { font-family: var(--v1-font-serif); font-size: 18px; font-weight: 600; margin: 26px 0 10px; }
.prose-content p { margin: 14px 0; }
.prose-content ul, .prose-content ol { margin: 14px 0; padding-left: 24px; }
.prose-content li { margin: 6px 0; }
.prose-content blockquote { margin: 18px 0; padding: 10px 16px; border-left: 4px solid var(--v1-brand); background: var(--v1-brand-soft); border-radius: 6px; color: var(--v1-muted); }
.prose-content strong { color: var(--v1-brand-dark); }
.prose-content a { color: var(--v1-brand); text-decoration: underline; }
.prose-content img { max-width: 100%; height: auto; display: block; margin: 20px auto; border-radius: 8px; box-shadow: var(--v1-shadow); }
.article-nav { display: flex; justify-content: space-between; gap: 16px; margin-top: 36px; border-top: 1px solid var(--v1-line); padding-top: 20px; }
.article-nav__item { max-width: 48%; }
.article-nav__label { font-size: 12px; color: var(--v1-muted); margin-bottom: 4px; }
.article-nav__title { font-size: 14px; font-weight: 600; }
.article-nav__title:hover { color: var(--v1-brand); }
.article-nav__item--next { text-align: right; }
.related, .faq { margin-top: 40px; }
.related__title, .faq__title { font-family: var(--v1-font-serif); font-size: 18px; font-weight: 600; margin-bottom: 16px; }
.faq__list { display: flex; flex-direction: column; gap: 10px; }
.faq__item { border: 1px solid var(--v1-line); border-radius: 8px; overflow: hidden; background: var(--v1-surface); }
.faq__question { padding: 12px 16px; font-size: 15px; font-weight: 600; cursor: pointer; list-style: none; }
.faq__question::-webkit-details-marker { display: none; }
.faq__answer { padding: 0 16px 12px; margin: 0; font-size: 14px; color: var(--v1-muted); }

/* 搜索 */
.search-panel { max-width: 720px; margin: 0 auto; padding: 0 20px 52px; }
.search-panel__form { display: flex; margin: 26px 0 20px; }
.search-panel__suggest { position: relative; display: flex; flex: 1; }
.search-panel__input { flex: 1; padding: 11px 16px; font-size: 15px; border: 1px solid var(--v1-line); border-radius: 8px 0 0 8px; background: var(--v1-surface); color: var(--v1-body); outline: none; }
.search-panel__input:focus { border-color: var(--v1-brand); }
.search-panel__submit { padding: 0 22px; border: none; background: var(--v1-brand); color: #fff; font-size: 15px; border-radius: 0 8px 8px 0; cursor: pointer; }
.search-suggest__list { position: absolute; top: 100%; left: 0; right: 0; z-index: 30; margin: 0; padding: 4px 0; list-style: none; background: var(--v1-surface); border: 1px solid var(--v1-line); border-radius: 0 0 8px 8px; box-shadow: var(--v1-shadow-hover); max-height: 260px; overflow-y: auto; }
.search-suggest__list[hidden] { display: none; }
.search-suggest__item { padding: 8px 14px; font-size: 14px; cursor: pointer; }
.search-suggest__item:hover, .search-suggest__item.is-active { background: var(--v1-brand-soft); }
.search-panel__result-count { color: var(--v1-muted); font-size: 14px; margin-bottom: 20px; }
.search-panel__empty { color: var(--v1-muted); font-size: 15px; }
.search-panel__related { margin-top: 34px; }
.search-panel__related-title { font-family: var(--v1-font-serif); font-size: 16px; font-weight: 600; margin-bottom: 12px; }
.hot-list { list-style: none; display: flex; flex-direction: column; gap: 10px; font-size: 14px; }
.hot-list a { color: var(--v1-muted); }
.hot-list a:hover { color: var(--v1-brand); }
.hot-list__rank { display: inline-block; width: 20px; color: var(--v1-brand); font-weight: 600; }

/* 静态页 */
.static-page { max-width: 760px; margin: 0 auto; padding: 0 20px 52px; }

/* 404 */
.error { text-align: center; padding: 90px 20px 70px; }
.error__code { font-family: var(--v1-font-serif); font-size: 88px; font-weight: 700; color: var(--v1-brand); line-height: 1; margin-bottom: 12px; }
.error__title { font-family: var(--v1-font-serif); font-size: 22px; margin-bottom: 10px; }
.error__desc { color: var(--v1-muted); max-width: 460px; margin: 0 auto 26px; }
.error__link { display: inline-block; padding: 9px 22px; border-radius: 999px; background: var(--v1-brand); color: #fff; font-size: 14px; }

/* Footer */
.site-footer { border-top: 1px solid var(--v1-line); margin-top: 24px; }
.site-footer__grid { display: grid; grid-template-columns: 1fr; gap: 28px; padding: 40px 20px 24px; justify-items: end; }
.site-footer__nav { text-align: right; }
.site-footer__title { font-size: 13px; font-weight: 600; color: var(--v1-muted); margin-bottom: 12px; letter-spacing: 0.05em; }
.site-footer__links { list-style: none; display: flex; flex-direction: column; gap: 8px; font-size: 14px; align-items: flex-end; }
.site-footer__links a { color: var(--v1-muted); }
.site-footer__links a:hover { color: var(--v1-brand); }
.site-footer__friends { display: flex; flex-wrap: wrap; gap: 6px 16px; padding: 12px 20px; border-top: 1px solid var(--v1-line); font-size: 13px; }
.site-footer__friends-label { color: var(--v1-muted); }
.site-footer__friends-link { color: var(--v1-brand); }
.site-footer__disclaimer { padding: 12px 20px; border-top: 1px solid var(--v1-line); color: var(--v1-muted); font-size: 12px; }
.site-footer__bottom { border-top: 1px solid var(--v1-line); padding: 16px 20px; text-align: center; color: var(--v1-muted); font-size: 12px; }
.site-footer__copyright { margin: 0; }

/* 响应式 */
@media (max-width: 900px) {
  .grid--3, .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .layout { grid-template-columns: 1fr; }
  .site-footer__grid { grid-template-columns: 1fr 1fr; }
  .site-nav { display: none; }
  .nav-toggle { display: inline-flex; }
  .site-nav.is-open { display: flex; flex-direction: column; align-items: flex-start; gap: 4px; position: absolute; top: 60px; left: 0; right: 0; background: var(--v1-surface); border-bottom: 1px solid var(--v1-line); padding: 12px 20px 16px; }
  .site-nav.is-open .site-nav__link { width: 100%; padding: 8px 0; }
}
@media (max-width: 560px) {
  .grid--3, .grid--4 { grid-template-columns: 1fr; }
  .site-footer__grid { grid-template-columns: 1fr; }
  .site-search__input { width: 110px; }
  .site-search__input:focus { width: 130px; }
  .list-item { flex-direction: column; }
  .list-item__media { width: 100%; aspect-ratio: 16/9; }
  .hero__title { font-size: 26px; }
  .article-header__title { font-size: 22px; }
  .article-body { grid-template-columns: 1fr; }
  .article-toc { position: static; max-height: none; margin-bottom: 8px; }
}
@media (max-width: 400px) {
  .site-search { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}