:root {
  color-scheme: light;
  --background: #fff;
  --surface: #f5f5f5;
  --text: #222326;
  --muted: #65676b;
  --line: #e5e5e5;
  --link: #2a7ae2;
  --code: #f2f3f5;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --background: #1d1e20;
    --surface: #2e2e33;
    --text: #dadadb;
    --muted: #9b9b9e;
    --line: #3b3b40;
    --link: #9ac3ff;
    --code: #292a2e;
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --background: #1d1e20;
  --surface: #2e2e33;
  --text: #dadadb;
  --muted: #9b9b9e;
  --line: #3b3b40;
  --link: #9ac3ff;
  --code: #292a2e;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible, button:focus-visible, input:focus-visible { outline: 2px solid var(--link); outline-offset: 4px; }
[hidden] { display: none !important; }
.visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }

.site-header { width: 100%; }
.header-inner { width: min(calc(100% - 48px), 1200px); min-height: 76px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand-group { display: flex; align-items: center; gap: 17px; flex: none; }
.site-name { color: var(--text); font-size: 25px; font-weight: 700; line-height: 1; letter-spacing: -.035em; white-space: nowrap; }
.site-name:hover { color: var(--text); text-decoration: none; }
.theme-toggle { display: inline-flex; align-items: center; justify-content: center; width: 30px; height: 30px; padding: 0; border: 0; background: transparent; color: var(--text); cursor: pointer; }
.theme-toggle svg { width: 23px; height: 23px; }
.theme-toggle .icon-sun { display: none; }
.theme-toggle[data-mode="dark"] .icon-sun { display: block; }
.theme-toggle[data-mode="dark"] .icon-moon { display: none; }
.brand-divider { color: var(--muted); font-size: 20px; font-weight: 300; }
.site-nav { display: flex; align-items: center; gap: 29px; }
.site-nav a { color: var(--text); font-size: 16px; white-space: nowrap; }
.site-nav a:hover { text-decoration: none; opacity: .72; }
.site-nav a[aria-current="page"] { font-weight: 650; text-decoration: underline; text-underline-offset: 7px; text-decoration-thickness: 2px; }

.page-wrap { width: min(calc(100% - 48px), 760px); margin: 0 auto; }
.home-intro { padding: 104px 0 112px; }
.home-intro h1 { margin: 0; font-size: clamp(31px, 3.5vw, 36px); line-height: 1.25; font-weight: 750; letter-spacing: -.035em; }
.wave { display: inline-block; margin-right: 8px; font-size: .84em; vertical-align: .07em; }
.home-intro > p { margin: 24px 0 0; color: var(--muted); font-size: 16px; line-height: 1.65; }
.social-links { display: flex; align-items: center; gap: 24px; margin-top: 30px; }
.social-links a { display: inline-flex; align-items: center; justify-content: center; width: 25px; height: 28px; color: var(--text); }
.social-links a:hover { opacity: .68; }
.social-links svg { width: 25px; height: 25px; }

.post-list { padding: 0; margin: 0; list-style: none; }
.post-item { margin-bottom: 23px; }
.post-card, .empty-card { padding: 26px 28px 28px; border-radius: 12px; background: var(--surface); }
.post-card { transition: transform .18s ease; }
.post-card:hover { transform: translateY(-2px); }
.post-card h2 { margin: 0 0 12px; font-size: 25px; font-weight: 700; line-height: 1.35; letter-spacing: -.025em; }
.post-card h2 a { color: var(--text); }
.post-card h2 a:hover { text-decoration: none; }
.post-summary { display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; margin: 0 0 13px; color: var(--muted); font-size: 16px; line-height: 1.65; }
.post-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 7px; margin: 0; color: var(--muted); font-size: 13px; }
.empty-card { min-height: 150px; display: flex; align-items: center; color: var(--muted); font-size: 17px; }

.site-footer { width: min(calc(100% - 48px), 760px); margin: 100px auto 0; padding: 28px 0 45px; border-top: 1px solid var(--line); color: var(--muted); text-align: center; font-size: 13px; }
.site-footer a { color: inherit; }

.archive-page { padding-top: 76px; }
.page-heading { margin-bottom: 29px; }
.page-heading h1, .subpage h1 { margin: 0; font-size: 36px; line-height: 1.25; font-weight: 700; letter-spacing: -.035em; }
.archive-year { padding: 22px 0 28px; border-top: 1px solid var(--line); }
.archive-year h2 { margin: 0 0 10px; font-size: 22px; }
.archive-year ul { padding: 0; margin: 0; list-style: none; }
.archive-year li { display: grid; grid-template-columns: 62px minmax(0, 1fr) auto; gap: 14px; align-items: baseline; padding: 7px 0; }
.archive-year time, .archive-category { color: var(--muted); font-size: 13px; }
.archive-year a { color: var(--text); }
.archive-year a:hover { color: var(--link); text-decoration: none; }

.subpage { padding-top: 76px; }
.subpage > h1 { margin-bottom: 32px; }
.search-input { display: block; width: 100%; padding: 12px 16px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface); color: var(--text); font: inherit; font-size: 17px; }
.search-input::placeholder { color: var(--muted); }
.search-status { margin: 21px 0 10px; color: var(--muted); font-size: 13px; }
.search-results { margin: 0; padding: 0; list-style: none; }
.search-results li { display: flex; justify-content: space-between; gap: 20px; padding: 14px 0; border-bottom: 1px solid var(--line); }
.search-results a { color: var(--text); }
.search-results span { flex: none; color: var(--muted); font-size: 13px; }
.tag-cloud { display: flex; flex-wrap: wrap; gap: 9px; margin-bottom: 38px; }
.tag-cloud a { padding: 5px 12px; border-radius: 7px; background: var(--surface); color: var(--text); font-size: 14px; }
.tag-section { padding: 23px 0; border-top: 1px solid var(--line); }
.tag-section h2 { margin: 0 0 9px; font-size: 21px; }
.tag-section h2 span { margin-left: 5px; color: var(--muted); font-size: 14px; font-weight: 400; }
.tag-section ul { padding-left: 21px; margin: 0; }
.tag-section li { padding: 3px 0; }
.tag-section li a { color: var(--text); }
.faq-page section { padding: 23px 0; border-top: 1px solid var(--line); }
.faq-page h2 { margin: 0 0 8px; font-size: 21px; }
.faq-page p { margin: 0; color: var(--muted); }

.article-page { font-family: Helvetica, Arial, "PingFang SC", "Microsoft YaHei", sans-serif; }
.article-header { padding: 65px 0 30px; border-bottom: 1px solid var(--line); }
.return-link { color: var(--muted); font-size: 13px; }
.article-header h1 { margin: 36px 0 16px; font-size: clamp(34px, 5vw, 48px); font-weight: 600; line-height: 1.25; letter-spacing: -.04em; }
.article-summary { margin: 23px 0 0; color: var(--muted); font-size: 17px; line-height: 1.65; }
.article-content { padding: 30px 0 65px; font-size: 17px; line-height: 1.8; overflow-wrap: anywhere; }
.article-content > :first-child { margin-top: 0; }
.article-content p { margin: 0 0 1.35em; }
.article-content h2 { margin: 2em 0 .65em; font-size: 29px; line-height: 1.3; font-weight: 600; }
.article-content h3 { margin: 1.8em 0 .6em; font-size: 23px; line-height: 1.35; font-weight: 600; }
.article-content h4 { margin: 1.5em 0 .5em; font-size: 19px; }
.article-content ul, .article-content ol { margin: 0 0 1.4em; padding-left: 1.5em; }
.article-content li { padding-left: .2em; margin: .25em 0; }
.article-content blockquote { margin: 1.8em 0; padding: 16px 22px; border-left: 3px solid var(--link); background: var(--surface); color: var(--muted); }
.article-content blockquote > :last-child { margin-bottom: 0; }
.article-content pre { max-width: 100%; overflow-x: auto; margin: 1.7em 0; padding: 20px 23px; border-radius: 6px; background: var(--code); font-size: 14px; line-height: 1.6; }
.article-content code { font-family: Consolas, "SFMono-Regular", Menlo, monospace; font-size: .86em; }
.article-content :not(pre) > code { padding: 2px 5px; border-radius: 3px; background: var(--code); }
.article-content img, .article-content video { display: block; max-width: 100%; height: auto; margin: 1.8em auto; }
.article-content iframe { display: block; max-width: 100%; margin: 1.8em auto; }
.article-content figure { margin: 1.8em 0; }
.article-content figcaption { color: var(--muted); text-align: center; font-size: 13px; }
.article-content table { display: block; width: max-content; max-width: 100%; overflow-x: auto; border-collapse: collapse; font-size: 15px; }
.article-content th, .article-content td { padding: 9px 12px; border: 1px solid var(--line); }
.article-content th { background: var(--code); }
.article-content hr { margin: 2.5em 0; border: 0; border-top: 1px solid var(--line); }
.article-bottom { display: flex; justify-content: space-between; gap: 24px; padding-top: 24px; border-top: 1px solid var(--line); font-size: 14px; }

@media (max-width: 780px) {
  .header-inner { width: min(calc(100% - 36px), 1200px); flex-wrap: wrap; gap: 0; padding-top: 19px; }
  .brand-group { width: 100%; justify-content: flex-start; }
  .site-name { font-size: 23px; }
  .site-nav { width: 100%; gap: 25px; overflow-x: auto; scrollbar-width: none; padding: 16px 0 15px; }
  .site-nav::-webkit-scrollbar { display: none; }
  .site-nav a { font-size: 15px; }
  .page-wrap, .site-footer { width: min(calc(100% - 36px), 760px); }
  .home-intro { padding: 72px 0 85px; }
  .home-intro h1 { font-size: clamp(27px, 5vw, 33px); }
  .home-intro > p { font-size: 15px; }
  .social-links { gap: 23px; }
  .post-card, .empty-card { padding: 23px; }
  .post-card h2 { font-size: 23px; }
  .archive-page, .subpage { padding-top: 58px; }
  .article-header { padding-top: 50px; }
}

@media (max-width: 460px) {
  .home-intro h1 { font-size: 27px; }
  .home-intro > p { font-size: 14px; }
  .home-intro > p { margin-top: 21px; }
  .home-intro { padding-bottom: 72px; }
  .post-summary { font-size: 15px; }
  .archive-year li { grid-template-columns: 53px minmax(0, 1fr); gap: 9px; }
  .archive-category { display: none; }
  .search-results li { display: block; }
  .search-results span { display: block; margin-top: 3px; }
  .article-content { font-size: 16px; }
}