:root {
  color-scheme: light;
  --ink: #11182b;
  --muted: #5b6474;
  --line: #dde3ed;
  --surface: #ffffff;
  --surface-soft: #f5f7fb;
  --navy: #111a35;
  --blue: #245eea;
  --blue-dark: #1948bc;
  --green: #0a8f67;
  --radius: 0.875rem;
  --shadow: 0 1rem 2.5rem rgba(17, 24, 43, 0.08);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--surface);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans TC", sans-serif;
  font-size: 1rem;
  line-height: 1.75;
  overflow-wrap: anywhere;
}
img { display: block; max-width: 100%; height: auto; }
a { color: var(--blue-dark); text-underline-offset: 0.2em; }
button, input, select { font: inherit; }
button, .button { min-height: 2.75rem; }
[hidden] { display: none !important; }

.shell { width: min(100% - 2rem, 74rem); margin-inline: auto; }
.shell.narrow { max-width: 52rem; }
.skip-link {
  position: fixed;
  z-index: 100;
  top: 0.5rem;
  left: 0.5rem;
  padding: 0.75rem 1rem;
  border-radius: 0.5rem;
  background: white;
  color: var(--ink);
  transform: translateY(-160%);
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  position: sticky;
  z-index: 50;
  top: 0;
  border-bottom: 1px solid rgba(221, 227, 237, 0.9);
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(0.75rem);
}
.nav-shell { display: flex; flex-direction: column; gap: 0.5rem; padding-block: 0.75rem; }
.brand {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  gap: 0.625rem;
  color: var(--ink);
  font-weight: 800;
  text-decoration: none;
}
.brand-mark {
  display: grid;
  width: 2.25rem;
  height: 2.25rem;
  place-items: center;
  border-radius: 0.65rem;
  background: var(--navy);
  color: white;
}
.site-nav { display: flex; gap: 0.25rem; overflow-x: auto; padding-bottom: 0.125rem; }
.site-nav a {
  display: inline-flex;
  min-width: max-content;
  min-height: 2.75rem;
  align-items: center;
  padding: 0.5rem 0.75rem;
  border-radius: 0.5rem;
  color: var(--ink);
  font-size: 0.9375rem;
  font-weight: 650;
  text-decoration: none;
}
.site-nav a:hover, .site-nav a:focus-visible { background: var(--surface-soft); }
.site-nav .nav-cta { background: var(--navy); color: white; }

.blog-hero, .category-hero {
  padding: clamp(4rem, 10vw, 7rem) 0;
  background:
    radial-gradient(circle at 80% 20%, rgba(36, 94, 234, 0.35), transparent 32%),
    linear-gradient(135deg, #0d142a, #17254c);
  color: white;
}
.blog-hero h1, .category-hero h1, .article-header h1 {
  max-width: 22ch;
  margin: 0.5rem 0 1rem;
  font-size: clamp(2.25rem, 8vw, 4.75rem);
  line-height: 1.08;
  letter-spacing: -0.035em;
}
.blog-hero p, .category-hero p { max-width: 42rem; margin: 0; color: #cbd5ed; font-size: clamp(1.05rem, 2.5vw, 1.25rem); }
.eyebrow {
  display: inline-block;
  color: #4f7cf0;
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.blog-hero .eyebrow, .category-hero .eyebrow { color: #94b2ff; }
.category-hero { padding: clamp(2.5rem, 7vw, 5rem) 0; background: linear-gradient(135deg, #0d142a, #243968); color: white; }
.category-hero .breadcrumbs { color: #cbd5ed; }
.category-hero .breadcrumbs a { color: #cbd5ed; }
.category-count { display: inline-flex; margin-top: 1.25rem; padding: .4rem .75rem; border: 1px solid #ffffff3d; border-radius: 999px; color: #e8edff; background: #ffffff14; font-size: .875rem; }

.blog-section { min-height: 40rem; padding: 3rem 0 5rem; }
.blog-category-intro { display: flex; flex-direction: column; gap: 1rem; margin-bottom: 1rem; }
.blog-category-intro h2, .blog-category-intro p { margin: 0; }
.blog-category-intro h2 { margin-top: .25rem; font-size: clamp(1.5rem, 4vw, 2rem); }
.blog-category-intro p { margin-top: .35rem; color: var(--muted); }
.category-link-list { display: flex; max-width: 100%; gap: .5rem; overflow-x: auto; margin-bottom: 1.5rem; padding-bottom: .4rem; scrollbar-width: thin; }
.category-link-list a { display: inline-flex; min-height: 2.75rem; flex: 0 0 auto; align-items: center; padding: .55rem .8rem; border: 1px solid var(--line); border-radius: 999px; color: var(--ink); background: white; font-size: .875rem; font-weight: 700; text-decoration: none; }
.category-link-list a:hover, .category-link-list a[aria-current="page"] { border-color: var(--blue); color: white; background: var(--blue); }
.category-directory-grid { display: grid; grid-template-columns: minmax(0, 1fr); gap: 1rem; }
.category-directory-card { display: flex; min-height: 15rem; flex-direction: column; padding: 1.4rem; border: 1px solid var(--line); border-radius: var(--radius); color: var(--ink); background: white; box-shadow: 0 .4rem 1.4rem rgba(17, 24, 43, .05); text-decoration: none; }
.category-directory-card > span { color: var(--blue-dark); font-size: .8rem; font-weight: 800; }
.category-directory-card h2 { margin: .7rem 0 .5rem; font-size: 1.35rem; }
.category-directory-card p { margin: 0 0 1rem; color: var(--muted); }
.category-directory-card strong { margin-top: auto; color: var(--blue-dark); }
.filters {
  display: grid;
  gap: 1rem;
  margin-bottom: 1rem;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-soft);
}
.filters label { display: grid; gap: 0.375rem; color: var(--muted); font-size: 0.875rem; font-weight: 700; }
.filters input, .filters select {
  width: 100%;
  min-height: 3rem;
  padding: 0.7rem 0.875rem;
  border: 1px solid #bcc6d6;
  border-radius: 0.625rem;
  background: white;
  color: var(--ink);
  font-size: 1rem;
}
.filters input:focus, .filters select:focus { outline: 3px solid rgba(36, 94, 234, 0.2); border-color: var(--blue); }
.result-count { min-height: 1.75rem; margin: 0 0 1rem; color: var(--muted); }

.card-grid { display: grid; grid-template-columns: minmax(0, 1fr); gap: 1.25rem; }
.post-card {
  display: flex;
  min-width: 0;
  flex-direction: column;
  overflow: clip;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: white;
  box-shadow: 0 0.4rem 1.4rem rgba(17, 24, 43, 0.05);
}
.post-card-image { aspect-ratio: 16 / 9; overflow: hidden; background: #dfe5f1; }
.post-card-image img { width: 100%; height: 100%; object-fit: cover; transition: transform 220ms ease; }
.post-card:hover .post-card-image img { transform: scale(1.025); }
.post-card-body { display: flex; flex: 1; flex-direction: column; align-items: flex-start; padding: 1.25rem; }
.post-card-meta { display: flex; width: 100%; justify-content: space-between; gap: 1rem; color: var(--muted); font-size: 0.8125rem; }
.post-card-meta a { color: var(--blue-dark); font-weight: 700; }
.post-card h2 { margin: 0.75rem 0 0.625rem; font-size: 1.25rem; line-height: 1.35; }
.post-card h2 a { color: var(--ink); text-decoration: none; }
.post-card h2 a:hover { color: var(--blue-dark); }
.post-card p { margin: 0 0 1rem; color: var(--muted); font-size: 0.9375rem; }
.post-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-top: auto; }
.post-tags span { padding: 0.25rem 0.5rem; border-radius: 99rem; background: #eef2fb; color: #42506b; font-size: 0.75rem; }
.text-link { display: inline-flex; min-height: 2.75rem; align-items: center; margin-top: 0.75rem; font-weight: 750; text-decoration: none; }
.empty-note { padding: 2rem; border: 1px dashed #b8c3d6; border-radius: var(--radius); color: var(--muted); text-align: center; }
.pagination { display: flex; align-items: center; justify-content: center; gap: 0.75rem; margin-top: 2rem; }
.pagination button, .share-row button {
  min-width: 6rem;
  padding: 0.625rem 1rem;
  border: 1px solid #b9c4d5;
  border-radius: 0.625rem;
  background: white;
  color: var(--ink);
  cursor: pointer;
}
.pagination button:disabled { cursor: not-allowed; opacity: 0.45; }

.breadcrumbs {
  display: flex;
  max-width: 100%;
  gap: 0.5rem;
  overflow-x: auto;
  padding: 1.25rem 0;
  color: var(--muted);
  font-size: 0.875rem;
  white-space: nowrap;
}
.breadcrumbs a { color: var(--muted); }
.category-eyebrow { text-decoration: none; }
.category-eyebrow:hover { text-decoration: underline; }
.article-shell { width: min(100% - 2rem, 74rem); margin-inline: auto; }
.article-header { padding: clamp(2rem, 6vw, 5rem) 0 2rem; }
.article-header h1 { max-width: 24ch; color: var(--ink); font-size: clamp(2.25rem, 7vw, 4.25rem); }
.article-deck { max-width: 48rem; margin: 0 0 1.25rem; color: var(--muted); font-size: clamp(1.05rem, 2.5vw, 1.25rem); }
.article-meta { display: flex; flex-wrap: wrap; gap: 0.5rem 1rem; color: var(--muted); font-size: 0.875rem; }
.review-note { display: inline-block; margin: 1rem 0 0; padding: 0.5rem 0.75rem; border-radius: 0.5rem; background: #eaf7f2; color: #17634e; font-size: 0.875rem; }
.article-cover { margin: 0 0 2.5rem; }
.article-cover img { width: 100%; aspect-ratio: 16 / 9; border-radius: var(--radius); object-fit: cover; background: #e4e9f2; }
.article-cover figcaption { margin-top: 0.5rem; color: var(--muted); font-size: 0.8125rem; text-align: center; }
.article-layout { display: grid; grid-template-columns: minmax(0, 1fr); gap: 2rem; max-width: 70rem; margin: 0 auto 4rem; }
.article-aside { order: 2; }
.toc-card { padding: 1rem; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface-soft); }
.toc-card strong { display: block; margin-bottom: 0.5rem; }
.toc-card nav { display: grid; }
.toc-card a { display: flex; min-height: 2.75rem; align-items: center; border-top: 1px solid var(--line); color: var(--muted); font-size: 0.875rem; text-decoration: none; }
.toc-card a:hover { color: var(--blue-dark); }
.toc-card .toc-subitem { padding-left: 1rem; font-size: 0.8125rem; }
.takeaways { margin: 0 0 2rem; padding: 1.25rem; border-left: 0.3rem solid var(--blue); border-radius: 0 var(--radius) var(--radius) 0; background: #f0f4ff; }
.takeaways h2 { margin: 0 0 0.5rem; font-size: 1.25rem; }
.takeaways ul { margin: 0; padding-left: 1.25rem; }
.takeaways li + li { margin-top: 0.375rem; }

.prose { max-width: 70ch; color: #242b3a; }
.prose h2, .prose h3 { scroll-margin-top: 6rem; color: var(--ink); line-height: 1.3; }
.prose h2 { margin: 2.75rem 0 1rem; padding-top: 0.5rem; font-size: clamp(1.6rem, 4vw, 2rem); }
.prose h3 { margin: 2rem 0 0.75rem; font-size: 1.3rem; }
.prose p, .prose ul, .prose ol, .prose blockquote { margin: 0 0 1.25rem; }
.prose ul, .prose ol { padding-left: 1.5rem; }
.prose li + li { margin-top: 0.45rem; }
.prose img { margin: 1.5rem auto; border-radius: 0.75rem; }
.prose blockquote { padding: 1rem 1.25rem; border-left: 0.3rem solid var(--green); background: #eef9f5; color: #24483d; }
.prose table { display: block; max-width: 100%; overflow-x: auto; border-collapse: collapse; }
.prose th, .prose td { padding: 0.65rem; border: 1px solid var(--line); text-align: left; }
.prose code { padding: 0.12rem 0.3rem; border-radius: 0.25rem; background: #eef1f6; }
.prose pre { max-width: 100%; overflow-x: auto; padding: 1rem; border-radius: 0.75rem; background: #111827; color: white; }
.prose pre code { padding: 0; background: transparent; }

.article-faq, .sources { max-width: 70ch; margin-top: 3rem; padding-top: 2rem; border-top: 1px solid var(--line); }
.article-faq h2, .sources h2 { margin-top: 0; font-size: 1.6rem; }
.article-faq details { border-bottom: 1px solid var(--line); }
.article-faq summary { display: flex; min-height: 3.5rem; align-items: center; font-weight: 750; cursor: pointer; }
.article-faq details p { margin-top: 0; color: var(--muted); }
.sources ol { padding-left: 1.5rem; }
.sources li + li { margin-top: 0.5rem; }
.share-row { display: flex; flex-wrap: wrap; align-items: center; gap: 0.75rem; max-width: 70ch; margin-top: 2rem; }
#share-status { color: var(--green); font-size: 0.875rem; }

.related-section { padding: 4rem 0; background: var(--surface-soft); }
.section-heading { margin-bottom: 1.5rem; }
.section-heading h2 { margin: 0.3rem 0 0; font-size: clamp(1.75rem, 5vw, 2.5rem); }
.article-cta { padding: 4rem 0; }
.cta-panel { display: grid; gap: 1.5rem; padding: clamp(1.5rem, 5vw, 3rem); border-radius: 1.25rem; background: var(--navy); color: white; }
.cta-panel h2 { margin: 0.25rem 0 0.5rem; font-size: clamp(1.6rem, 5vw, 2.5rem); line-height: 1.2; }
.cta-panel p { margin: 0; color: #bdc8e0; }
.button { display: inline-flex; width: fit-content; align-items: center; justify-content: center; padding: 0.75rem 1.15rem; border-radius: 0.65rem; font-weight: 750; text-decoration: none; }
.button.primary { background: white; color: var(--navy); }

.site-footer { padding: 3rem 0 1.5rem; background: #0a1022; color: #c4cce0; }
.footer-grid { display: grid; gap: 2rem; }
.footer-grid strong { color: white; font-size: 1.125rem; }
.footer-grid p { margin: 0.5rem 0 0; color: #929db5; }
.footer-grid nav { display: flex; flex-wrap: wrap; gap: 0.25rem 1rem; }
.footer-grid a { display: inline-flex; min-height: 2.75rem; align-items: center; color: #dce3f4; }
.footer-note { margin-top: 2rem; padding-top: 1.25rem; border-top: 1px solid #232d47; color: #808ba3; font-size: 0.8125rem; }
.tracker-pixel { position: absolute; top: -9999px; left: -9999px; }

@media (min-width: 40rem) {
  .nav-shell { flex-direction: row; align-items: center; justify-content: space-between; }
  .filters { grid-template-columns: minmax(0, 2fr) minmax(12rem, 1fr); padding: 1.25rem; }
  .blog-category-intro { flex-direction: row; align-items: flex-end; justify-content: space-between; }
  .category-directory-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .card-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); align-items: start; }
  .cta-panel { grid-template-columns: minmax(0, 1fr) auto; align-items: center; }
}

@media (min-width: 64rem) {
  .card-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .category-directory-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .article-layout { grid-template-columns: 14rem minmax(0, 1fr); gap: 3.5rem; }
  .article-aside { order: 0; }
  .toc-card { position: sticky; top: 6.5rem; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
}