:root {
  --ground: #EEF0EB;
  --ground-2: #E3E7E1;
  --paper: #FFFFFF;
  --ink: #15202A;
  --ink-soft: #4A5660;
  --rule: #C5CCC6;
  --moat: #2E6378;
  --moat-tint: #D5E2E4;
  --pennant: #E9B526;
  --f-display: "Gloock", "Noto Serif SC", "Songti SC", Georgia, serif;
  --f-body: "Schibsted Grotesk", "Noto Sans SC", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
  --f-mono: "IBM Plex Mono", "Sarasa Mono SC", ui-monospace, Menlo, monospace;
  --wrap: 1180px;
  --radius: 14px;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 88px; }
body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font-family: var(--f-body);
  font-size: 17px;
  line-height: 1.7;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--moat); }
.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 16px; }
@media (min-width: 720px) { .wrap { padding: 0 32px; } }
[hidden] { display: none !important; }

/* ---------- header / footer ---------- */
.site-header {
  position: sticky; top: 0; z-index: 10;
  background: rgba(238, 240, 235, .92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--rule);
}
.header-row { display: flex; align-items: center; justify-content: space-between; height: 64px; gap: 12px; }
.brand { display: flex; align-items: baseline; gap: 8px; text-decoration: none; color: var(--ink); }
.brand-mark { font-family: var(--f-display); font-size: 26px; color: var(--moat); letter-spacing: .01em; }
.brand-sub { font-size: 14px; color: var(--ink-soft); }
.nav { display: flex; align-items: center; gap: 16px; }
.nav-link, .lang-switch { color: var(--ink); text-decoration: none; font-size: 15px; font-weight: 500; }
.nav-link:hover, .lang-switch:hover { color: var(--moat); }
.lang-switch { border: 1px solid var(--rule); border-radius: 999px; padding: 4px 12px; }
@media (max-width: 640px) { .hide-sm { display: none; } .brand-sub { display: none; } .nav { gap: 10px; } }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--ink); color: #fff; text-decoration: none;
  font-weight: 600; font-size: 15px; padding: 10px 18px; border-radius: 999px;
  border: 1px solid var(--ink); transition: background .15s, color .15s;
}
.btn:hover { background: var(--moat); border-color: var(--moat); }
.btn-small { padding: 7px 14px; font-size: 14px; }
.btn-ghost { background: transparent; color: var(--ink); }
.btn-ghost:hover { color: #fff; }

.site-footer { margin-top: 96px; border-top: 1px solid var(--rule); padding: 40px 0 24px; background: var(--ground-2); }
.footer-row { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 24px; }
.footer-row p { margin: 6px 0 0; color: var(--ink-soft); max-width: 460px; font-size: 15px; }
.footer-links { display: flex; flex-wrap: wrap; gap: 20px; align-items: center; }
.footer-links a { color: var(--ink); text-decoration: none; font-weight: 500; }
.fine { color: var(--ink-soft); font-size: 13px; margin-top: 24px; }

/* ---------- home ---------- */
.hero { padding-top: 56px; padding-bottom: 24px; }
.kicker { color: var(--moat); font-weight: 600; letter-spacing: .04em; margin: 0 0 8px; font-size: 15px; }
.hero-title { font-family: var(--f-display); font-weight: 700; font-size: clamp(34px, 6vw, 64px); line-height: 1.12; margin: 0 0 16px; max-width: 16em; }
.hero-text { color: var(--ink-soft); font-size: clamp(17px, 2vw, 20px); max-width: 40em; margin: 0; }

.filters { padding-top: 16px; padding-bottom: 8px; }
.filter-label { font-size: 14px; color: var(--ink-soft); font-weight: 600; margin: 20px 0 10px; letter-spacing: .03em; }
.school-row, .cat-row { display: flex; gap: 10px; overflow-x: auto; padding-bottom: 6px; scrollbar-width: thin; }
.school-btn, .cat-btn {
  flex: none; cursor: pointer; font: inherit; font-size: 15px; font-weight: 500; color: var(--ink);
  background: var(--paper); border: 1px solid var(--rule); border-radius: 999px;
  display: inline-flex; align-items: center; gap: 8px; padding: 6px 14px 6px 6px;
}
.cat-btn { padding: 6px 14px; }
.school-btn:first-child { padding-left: 14px; }
.school-btn.is-active, .cat-btn.is-active { background: var(--ink); color: #fff; border-color: var(--ink); }
.badge-mark {
  width: 34px; height: 34px; border-radius: 50%; background: var(--bg); color: var(--fg);
  display: inline-flex; align-items: center; justify-content: center;
  font-family: var(--f-display); font-size: 15px; line-height: 1; overflow: hidden; white-space: nowrap;
}
.badge-mark.is-long { font-size: 11px; }
.badge-logo { width: 34px; height: 34px; object-fit: contain; background: transparent; border-radius: 50%; padding: 3px; }

.section-title { font-family: var(--f-display); font-size: 28px; font-weight: 700; margin: 40px 0 16px; }
.grid { display: grid; gap: 24px; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); }
@media (max-width: 400px) { .grid { grid-template-columns: 1fr; } }

.card {
  display: flex; flex-direction: column; background: var(--paper); border: 1px solid var(--rule);
  border-radius: var(--radius); overflow: hidden; text-decoration: none; color: var(--ink);
  transition: transform .15s, box-shadow .15s;
}
.card:hover { transform: translateY(-3px); box-shadow: 0 12px 28px rgba(21, 32, 42, .10); }
.card-cover { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; border-bottom: 1px solid var(--rule); }
.card-body { padding: 18px 20px 20px; display: flex; flex-direction: column; gap: 8px; flex: 1; }
.card-title { font-family: var(--f-display); font-weight: 700; font-size: 20px; line-height: 1.35; margin: 0; }
.card-excerpt { color: var(--ink-soft); font-size: 15px; line-height: 1.6; margin: 0;
  display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.card-meta { margin-top: auto; padding-top: 6px; display: flex; flex-wrap: wrap; gap: 8px; align-items: center; font-size: 13px; color: var(--ink-soft); }
.cat {
  align-self: flex-start; background: var(--pennant); color: var(--ink);
  font-size: 13px; font-weight: 600; padding: 2px 10px; border-radius: 999px;
}
.chips { display: inline-flex; flex-wrap: wrap; gap: 6px; }
.chip { background: var(--moat-tint); color: var(--moat); font-size: 12px; font-weight: 600; padding: 2px 8px; border-radius: 6px; }
.pill-note { background: var(--ground-2); color: var(--ink-soft); font-size: 12px; padding: 2px 8px; border-radius: 6px; }

@media (min-width: 900px) {
  .card-featured:not(.as-grid) { flex-direction: row; }
  .card-featured:not(.as-grid) .card-cover { flex: 0 0 58%; width: 58%; align-self: center; border-bottom: 0; border-right: 1px solid var(--rule); }
  .card-featured:not(.as-grid) .card-body { padding: 32px; justify-content: center; }
  .card-featured:not(.as-grid) .card-title { font-size: 30px; }
  .card-featured:not(.as-grid) .card-excerpt { font-size: 17px; -webkit-line-clamp: 4; }
}
.card-featured { margin-bottom: 8px; }
.empty { color: var(--ink-soft); padding: 24px 0; }

/* ---------- article ---------- */
.crumbs { display: flex; gap: 8px; font-size: 14px; color: var(--ink-soft); padding-top: 24px; }
.crumbs a { color: var(--ink-soft); }
.post-head { padding: 20px 0 24px; max-width: 860px; display: flex; flex-direction: column; gap: 12px; }
.post-title { font-family: var(--f-display); font-weight: 700; font-size: clamp(28px, 4.4vw, 46px); line-height: 1.2; margin: 0; }
.post-meta { color: var(--ink-soft); font-size: 15px; margin: 0; }
.post-cover { width: 100%; aspect-ratio: 16 / 9; border-radius: var(--radius); border: 1px solid var(--rule); }

.post-layout { display: grid; gap: 48px; margin-top: 40px; }
@media (min-width: 1040px) { .post-layout { grid-template-columns: minmax(0, 1fr) 300px; } }

.sidebar { display: flex; flex-direction: column; gap: 24px; }
@media (min-width: 1040px) { .sidebar { position: sticky; top: 88px; align-self: start; max-height: calc(100vh - 110px); overflow-y: auto; } }
@media (max-width: 1039px) { .toc { display: none; } }
.toc { background: var(--paper); border: 1px solid var(--rule); border-radius: var(--radius); padding: 18px 20px; }
.toc-title, .side-cta-title { font-weight: 700; margin: 0 0 8px; font-size: 15px; }
.toc ol { margin: 0; padding-left: 18px; font-size: 14px; line-height: 1.5; }
.toc li { margin: 6px 0; }
.toc a { color: var(--ink-soft); text-decoration: none; }
.toc a:hover { color: var(--moat); }
.side-cta { background: var(--ink); color: #E8ECE6; border-radius: var(--radius); padding: 22px 20px; }
.side-cta p { margin: 0 0 14px; font-size: 15px; line-height: 1.55; }
.side-cta .side-cta-title { color: #fff; font-size: 18px; font-family: var(--f-display); }
.side-cta .side-cta-title.small { font-size: 15px; font-family: var(--f-body); margin-top: 18px; }
.side-cta .btn { background: var(--pennant); color: var(--ink); border-color: var(--pennant); width: 100%; }
.side-cta .btn:hover { background: #fff; border-color: #fff; }
.side-cta .btn-ghost { background: transparent; color: #fff; border-color: rgba(255, 255, 255, .5); }
.side-cta .btn-ghost:hover { background: #fff; color: var(--ink); }

.prose { min-width: 0; max-width: 760px; }
.prose h2 { font-family: var(--f-display); font-weight: 700; font-size: clamp(24px, 3vw, 30px); line-height: 1.3; margin: 56px 0 16px; }
.prose h3 { font-size: 21px; line-height: 1.4; margin: 36px 0 12px; }
.prose h4, .prose h5 { font-size: 18px; margin: 28px 0 10px; }
.prose p, .prose ul, .prose ol { margin: 0 0 18px; }
.prose li { margin: 6px 0; }
.prose li > ul, .prose li > ol { margin: 6px 0; }
.prose hr { border: 0; border-top: 1px solid var(--rule); margin: 40px 0; }
.prose strong { color: var(--ink); }
.prose blockquote {
  margin: 24px 0; padding: 16px 20px; background: var(--paper);
  border: 1px solid var(--rule); border-radius: 10px;
}
.prose blockquote p:last-child, .prose blockquote ul:last-child { margin-bottom: 0; }
.prose > blockquote:first-child { background: #FBF4DA; border-color: var(--pennant); font-size: 18px; }
.prose code { font-family: var(--f-mono); font-size: .88em; background: var(--ground-2); padding: 1px 6px; border-radius: 5px; }
.prose pre {
  background: var(--paper); border: 1px solid var(--rule); border-radius: 10px;
  padding: 16px; overflow-x: auto; font-size: 13px; line-height: 1.5; margin: 0 0 24px; white-space: pre-wrap; word-break: break-word;
}
.prose pre code { background: none; padding: 0; font-size: inherit; white-space: pre-wrap; overflow-wrap: anywhere; }
.table-wrap { overflow-x: auto; margin: 0 0 24px; border: 1px solid var(--rule); border-radius: 10px; background: var(--paper); }
.prose table { border-collapse: collapse; width: 100%; font-size: 15px; line-height: 1.55; min-width: 560px; }
.prose th, .prose td { padding: 10px 14px; text-align: left; vertical-align: top; border-bottom: 1px solid var(--rule); }
.prose th { background: var(--ground-2); font-weight: 700; }
.prose tr:last-child td { border-bottom: 0; }
.prose input[type="checkbox"] { margin-right: 6px; }

/* ---------- topic links ---------- */
a.cat-btn { text-decoration: none; }
a.cat-btn:hover { border-color: var(--moat); }
.cat-count { background: var(--ground-2); color: var(--ink-soft); font-size: 12px; font-weight: 600; padding: 0 7px; border-radius: 999px; margin-left: 2px; }
.cat-btn.is-active .cat-count { background: rgba(255, 255, 255, .2); color: #fff; }
.hero .crumbs { padding: 0 0 16px; }
.crumbs a:hover { color: var(--moat); }
.hero .crumbs + .kicker { margin-top: 12px; }

/* ---------- newsletter ---------- */
.newsletter { margin-top: 96px; }
.newsletter-row {
  display: grid; gap: 28px; padding-top: 32px; padding-bottom: 32px;
  background: var(--paper); border: 1px solid var(--rule); border-radius: var(--radius);
  max-width: calc(var(--wrap) - 32px);
}
@media (min-width: 900px) { .newsletter-row { grid-template-columns: 1fr 1fr; align-items: center; padding: 40px; gap: 48px; } }
.newsletter-copy h2 { font-family: var(--f-display); font-size: clamp(24px, 3vw, 30px); line-height: 1.25; margin: 0 0 10px; }
.newsletter-copy p { margin: 0 0 12px; color: var(--ink-soft); }
.newsletter-follow { display: flex; flex-wrap: wrap; gap: 8px 16px; align-items: center; font-size: 15px; }
.newsletter-follow span { font-weight: 600; color: var(--ink); }
.newsletter-follow a { color: var(--moat); font-weight: 500; }
.newsletter-label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 6px; }
.newsletter-field { display: flex; gap: 10px; }
.newsletter-field input[type=email] {
  flex: 1; min-width: 0; font: inherit; font-size: 16px; padding: 10px 14px;
  border: 1px solid var(--rule); border-radius: 999px; background: var(--ground); color: var(--ink);
}
.newsletter-field input[type=email]:focus-visible { outline: 2px solid var(--moat); outline-offset: 2px; }
.newsletter-field .btn { cursor: pointer; font: inherit; font-weight: 600; font-size: 15px; }
.newsletter-field .btn:disabled { opacity: .6; cursor: default; }
.newsletter-consent { display: flex; gap: 10px; align-items: flex-start; margin-top: 12px; font-size: 13px; line-height: 1.5; color: var(--ink-soft); }
.newsletter-consent input { margin-top: 3px; flex: none; }
.newsletter-status { min-height: 1.4em; margin: 10px 0 0; font-size: 14px; }
.newsletter-status[data-state=ok] { color: var(--moat); }
.newsletter-status[data-state=error] { color: #9A3B2B; }
@media (max-width: 480px) { .newsletter-field { flex-direction: column; } .newsletter-field .btn { width: 100%; } }
.newsletter + .site-footer { margin-top: 48px; }