/* OKPy — sketch logo palette (graphite on warm paper) */

:root {
  --primary: #3a3a3a;
  --secondary: #5c5c5c;
  --muted: #8a857c;
  --accent: #4a4540;
  --accent-hover: #2e2a26;
  --bg: #faf7f2;
  --bg-subtle: #f0ebe3;
  --bg-card: #fffdf9;
  --border: #ddd6cb;
  --border-sketch: #c9c0b4;
  --radius: 6px;
  --radius-lg: 10px;
  --shadow-sm: 0 1px 4px rgba(58, 48, 38, 0.06);
  --shadow-md: 0 4px 16px rgba(58, 48, 38, 0.08);
  --max-width: 1080px;
  --article-width: 680px;
  --font: "Charter", "Georgia", "Hiragino Mincho ProN", "Yu Mincho", serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", "Hiragino Sans", "Noto Sans JP", sans-serif;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, monospace;

  --cat-python: #4a6b5a;
  --cat-cloud: #4a5a6b;
  --cat-dev-method: #6b5a4a;
  --cat-data-model: #5a4a6b;
  --cat-pmbok: #6b4a5a;
  --cat-agile-scrum: #4a6b58;
  --cat-fit-journey: #6b5844;
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--primary);
  background: var(--bg);
  background-image: radial-gradient(circle at 1px 1px, rgba(201, 192, 180, 0.35) 1px, transparent 0);
  background-size: 24px 24px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

img { max-width: 100%; height: auto; display: block; }

/* ── Header (minimal — logo lives in brand hero) ── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: rgba(250, 247, 242, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 16px;
}

.header-home {
  margin-right: auto;
  display: inline-flex;
  align-items: center;
  padding: 4px;
  border-radius: var(--radius);
  opacity: 0.85;
  transition: opacity 0.15s;
}

.header-home:hover { opacity: 1; }

.header-home__icon {
  display: block;
  border-radius: 4px;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 16px;
}

.nav-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--secondary);
  white-space: nowrap;
}

.nav-link:hover { color: var(--primary); }

.nav-dropdown { position: relative; }

.nav-dropdown__toggle {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg);
  font-size: 0.875rem;
  font-weight: 500;
  font-family: inherit;
  color: var(--primary);
  cursor: pointer;
}

.nav-dropdown__toggle:hover { border-color: var(--border-sketch); }

.nav-dropdown__menu {
  display: none;
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 240px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: 8px 0;
  z-index: 300;
}

.nav-dropdown.is-open .nav-dropdown__menu { display: block; }

.nav-dropdown__menu a {
  display: block;
  padding: 10px 16px;
  font-size: 0.875rem;
  color: var(--primary);
}

.nav-dropdown__menu a:hover { background: var(--bg-subtle); }

.nav-dropdown__menu a.is-active {
  font-weight: 600;
  color: var(--accent);
}

.nav-burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 8px;
  border: none;
  background: none;
  cursor: pointer;
}

.nav-burger span {
  display: block;
  height: 2px;
  background: var(--primary);
  border-radius: 1px;
}

.mobile-nav {
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: 12px 24px 20px;
  border-top: 1px solid var(--border);
  background: var(--bg);
}

.mobile-nav[hidden] { display: none; }

.mobile-nav.is-open {
  display: flex;
}

.mobile-nav input {
  width: 100%;
  padding: 10px 16px;
  margin-bottom: 8px;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.9rem;
  font-family: inherit;
}

.mobile-nav a {
  padding: 10px 4px;
  font-size: 0.95rem;
  color: var(--primary);
  border-bottom: 1px solid var(--border);
}

/* ── Brand hero (full logo) ── */
.brand-hero {
  text-align: center;
  padding: 36px 0 28px;
  margin-bottom: 8px;
}

.brand-hero__logo-link {
  display: inline-block;
  max-width: min(640px, 94vw);
  margin: 0 auto 16px;
  line-height: 0;
  transition: transform 0.2s ease, opacity 0.2s;
}

.brand-hero__logo-link:hover {
  transform: scale(1.01);
  opacity: 0.92;
}

.brand-hero__logo {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.brand-hero__tagline {
  margin: 0 0 6px;
  font-size: 0.95rem;
  color: var(--secondary);
  letter-spacing: 0.02em;
}

.brand-hero__stats {
  margin: 0;
  font-size: 0.82rem;
  color: var(--muted);
}

/* ── Page search (above 最新の記事) ── */
.page-search {
  max-width: 560px;
  margin: 0 auto 40px;
  padding: 0 8px;
}

.page-search input {
  width: 100%;
  padding: 14px 22px;
  border: 1px solid var(--border-sketch);
  border-radius: 999px;
  background: var(--bg-card);
  font-size: 0.95rem;
  font-family: inherit;
  color: var(--primary);
  text-align: center;
  outline: none;
  box-shadow: var(--shadow-sm);
  transition: border-color 0.15s, box-shadow 0.15s, text-align 0.1s;
}

.page-search input::placeholder {
  color: var(--muted);
}

.page-search input:focus {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
  text-align: left;
}

.page-search input:not(:placeholder-shown) {
  text-align: left;
}

/* ── Page layout ── */
.page {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px 80px;
}

/* ── Publication hero (legacy) ── */
.pub-hero {
  text-align: center;
  padding: 48px 0 40px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 40px;
}

.pub-hero__label {
  margin: 0 0 12px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}

.pub-hero__title {
  margin: 0 0 12px;
  font-family: var(--font);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.pub-hero__desc {
  margin: 0 0 8px;
  font-size: 1.05rem;
  color: var(--secondary);
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

.pub-hero__stats {
  margin: 0;
  font-size: 0.85rem;
  color: var(--muted);
}

/* ── Category hero ── */
.cat-hero {
  padding: 32px 0 28px;
  margin-bottom: 32px;
  border-bottom: 1px solid var(--border);
}

.cat-hero__back {
  display: inline-block;
  margin-bottom: 16px;
  font-size: 0.875rem;
  color: var(--muted);
}

.cat-hero__back:hover { color: var(--accent); }

.cat-hero__title {
  margin: 0 0 8px;
  font-family: var(--font);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
}

.cat-hero__desc {
  margin: 0 0 8px;
  color: var(--secondary);
  max-width: 640px;
}

.cat-hero__count {
  margin: 0;
  font-size: 0.85rem;
  color: var(--muted);
}

/* ── Sections ── */
.section { margin-bottom: 56px; }

.section__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.section__title {
  margin: 0;
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.section__note {
  margin: 0;
  font-size: 0.8rem;
  color: var(--muted);
}

.section__more {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--accent);
  white-space: nowrap;
}

.section__more:hover { color: var(--accent-hover); }

/* ── Story cards (Medium-style) ── */
.story-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 40px 28px;
}

.story-card {
  display: flex;
  flex-direction: column;
  gap: 14px;
  transition: opacity 0.15s;
}

.story-card:hover .story-card__title { color: var(--accent); }

.story-card__cover {
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--bg-subtle);
  border: 1px solid var(--border);
}

.story-card__cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.story-card:hover .story-card__cover img { transform: scale(1.03); }

.story-card__cover--placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  border-style: dashed;
}

.story-card__cover-emoji {
  font-size: 2.75rem;
  line-height: 1;
  opacity: 0.85;
}

.story-card__cover--python { background: linear-gradient(145deg, #e8ede9 0%, #d4e0d8 100%); }
.story-card__cover--cloud { background: linear-gradient(145deg, #e8eaed 0%, #d4dae3 100%); }
.story-card__cover--dev-method { background: linear-gradient(145deg, #edeae6 0%, #e0d8cf 100%); }
.story-card__cover--data-model { background: linear-gradient(145deg, #eae8ed 0%, #dcd4e3 100%); }
.story-card__cover--pmbok { background: linear-gradient(145deg, #ede8ea 0%, #e0d4d9 100%); }
.story-card__cover--agile-scrum { background: linear-gradient(145deg, #e8ede9 0%, #d4e0d8 100%); }
.story-card__cover--fit-journey { background: linear-gradient(145deg, #edeae6 0%, #e0d4c4 100%); }

.story-card--featured .story-card__title {
  font-size: 1.35rem;
  -webkit-line-clamp: 3;
}

.story-card__body { display: flex; flex-direction: column; gap: 6px; }

.story-card__top {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.story-card__date {
  font-size: 0.75rem;
  color: var(--muted);
}

.story-card__title {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -0.01em;
  transition: color 0.15s;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Latest section: horizontal list layout */
#latest .story-grid {
  display: flex;
  flex-direction: column;
  gap: 0;
}

#latest .story-card {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 24px;
  align-items: center;
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
}

#latest .story-card .story-card__cover {
  aspect-ratio: 4 / 3;
}

#latest .story-card .story-card__title {
  font-size: 1.25rem;
  -webkit-line-clamp: 2;
}

#popular .story-grid,
.section:not(#latest) .story-grid {
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}

.story-card__summary {
  margin: 0;
  font-size: 0.9rem;
  color: var(--secondary);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ── Tags ── */
.tag {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 999px;
  letter-spacing: 0.02em;
}

.tag-python { background: #e8ede9; color: var(--cat-python); }
.tag-cloud { background: #e8eaed; color: var(--cat-cloud); }
.tag-dev-method { background: #edeae6; color: var(--cat-dev-method); }
.tag-data-model { background: #eae8ed; color: var(--cat-data-model); }
.tag-pmbok { background: #ede8ea; color: var(--cat-pmbok); }
.tag-agile-scrum { background: #e8ede9; color: var(--cat-agile-scrum); }
.tag-fit-journey { background: #edeae6; color: var(--cat-fit-journey); }

/* ── Topic grid ── */
.topic-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 12px;
}

.topic-card {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 8px;
  padding: 0 0 16px;
  border: 1px solid var(--border-sketch);
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  text-align: center;
  overflow: hidden;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.topic-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-sm);
}

.topic-card__thumb {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--bg-subtle);
  border-bottom: 1px solid var(--border);
}

.topic-card__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.topic-card:hover .topic-card__thumb img {
  transform: scale(1.04);
}

.topic-card__emoji,
.topic-card__label,
.topic-card__count {
  padding-left: 12px;
  padding-right: 12px;
}

.topic-card__emoji {
  font-size: 1.5rem;
  padding-top: 4px;
}

.topic-card__label {
  font-size: 0.85rem;
  font-weight: 600;
}

.topic-card__count {
  font-size: 0.75rem;
  color: var(--muted);
}

/* ── Article page ── */
.page-article .site-header { position: static; }

.article {
  max-width: var(--article-width);
  margin: 0 auto;
  padding: 0 24px 80px;
}

.article-back {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.article-back--top {
  margin-top: 8px;
  margin-bottom: 28px;
  padding-top: 28px;
}

.article-back--sidebar {
  display: none;
  flex-direction: column;
  align-items: stretch;
  gap: 10px;
  margin-top: 16px;
}

.article-back__primary,
.article-back__secondary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 12px 20px;
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.2;
  border-radius: 999px;
  border: 1px solid var(--border-sketch);
  transition: border-color 0.15s, box-shadow 0.15s, background 0.15s, color 0.15s;
}

.article-back__primary {
  color: var(--primary);
  background: var(--bg-card);
  box-shadow: var(--shadow-sm);
}

.article-back__primary:hover {
  color: var(--accent-hover);
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
}

.article-back__secondary {
  color: var(--primary);
  background: var(--bg-subtle);
}

.article-back__secondary:hover {
  color: var(--accent-hover);
  border-color: var(--primary);
  background: var(--bg-card);
  box-shadow: var(--shadow-sm);
}

.article-header {
  margin-bottom: 28px;
  text-align: center;
}

.article-hero {
  margin: 0 auto 40px;
  max-width: var(--article-width);
  text-align: center;
}

.article-hero img {
  display: block;
  width: 100%;
  max-width: var(--article-width);
  height: auto;
  margin: 0 auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.article-hero--placeholder {
  aspect-ratio: 16 / 9;
  max-width: var(--article-width);
  margin-left: auto;
  margin-right: auto;
  border-radius: var(--radius-lg);
  border: 1px dashed var(--border-sketch);
  overflow: hidden;
}

.article-hero__placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  width: 100%;
  height: 100%;
  min-height: 200px;
}

.article-hero__emoji {
  font-size: clamp(3rem, 10vw, 4.5rem);
  line-height: 1;
}

.article-hero__label {
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--secondary);
}

.article-hero--python .article-hero__placeholder { background: linear-gradient(145deg, #e8ede9 0%, #d4e0d8 100%); }
.article-hero--cloud .article-hero__placeholder { background: linear-gradient(145deg, #e8eaed 0%, #d4dae3 100%); }
.article-hero--dev-method .article-hero__placeholder { background: linear-gradient(145deg, #edeae6 0%, #e0d8cf 100%); }
.article-hero--data-model .article-hero__placeholder { background: linear-gradient(145deg, #eae8ed 0%, #dcd4e3 100%); }
.article-hero--pmbok .article-hero__placeholder { background: linear-gradient(145deg, #ede8ea 0%, #e0d4d9 100%); }
.article-hero--agile-scrum .article-hero__placeholder { background: linear-gradient(145deg, #e8ede9 0%, #d4e0d8 100%); }
.article-hero--fit-journey .article-hero__placeholder { background: linear-gradient(145deg, #edeae6 0%, #e0d4c4 100%); }

.article-cat {
  margin-bottom: 16px;
}

.article-title {
  margin: 0 0 12px;
  font-family: var(--font);
  font-size: clamp(1.75rem, 5vw, 2.5rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.article-meta {
  margin: 0;
  font-size: 0.9rem;
  color: var(--muted);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
}

.article-layout {
  display: block;
}

.article-sidebar {
  margin-bottom: 32px;
}

.toc {
  background: var(--bg-subtle);
  border-radius: var(--radius-lg);
  padding: 16px 18px;
  font-size: 0.8125rem;
  line-height: 1.5;
  border: 1px solid var(--border);
}

.toc .toc {
  padding: 0;
  background: none;
  border: none;
}

.toc__label {
  margin: 0 0 10px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

.toc ul,
.toc ol {
  margin: 0;
  padding-left: 1.1em;
}

.toc li { margin: 8px 0; }

.toc a {
  color: var(--secondary);
  font-weight: 500;
  display: block;
  line-height: 1.45;
  word-break: keep-all;
  overflow-wrap: anywhere;
}

.toc a:hover { color: var(--accent); }

.article-body {
  font-family: var(--font);
  font-size: 1.2rem;
  line-height: 1.8;
  color: var(--primary);
}

.article-body > *:first-child { margin-top: 0; }

.article-body h1,
.article-body h2,
.article-body h3,
.article-body h4 {
  font-family: var(--font-sans);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

.article-body h1 { font-size: 1.5rem; margin: 2em 0 0.75em; }
.article-body h2 { font-size: 1.35rem; margin: 2em 0 0.6em; }
.article-body h3 { font-size: 1.15rem; margin: 1.6em 0 0.5em; }
.article-body h4 { font-size: 1rem; margin: 1.4em 0 0.4em; }

.article-body p { margin: 0 0 1.4em; }

.article-body img {
  margin: 2em auto;
  border-radius: var(--radius-lg);
}

.article-body hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2.5em 0;
}

.article-body ul,
.article-body ol {
  margin: 0 0 1.4em;
  padding-left: 1.4em;
}

.article-body li { margin: 0.4em 0; }

.article-body blockquote {
  margin: 1.6em 0;
  padding-left: 1.2em;
  border-left: 3px solid var(--border);
  color: var(--secondary);
  font-style: italic;
}

.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.6em 0;
  font-family: var(--font-sans);
  font-size: 0.9rem;
}

.article-body th,
.article-body td {
  border: 1px solid var(--border);
  padding: 10px 12px;
  text-align: left;
}

.article-body th { background: var(--bg-subtle); font-weight: 600; }

.article-body pre {
  background: #1e293b;
  color: #f8fafc;
  padding: 16px;
  border-radius: var(--radius-lg);
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.85rem;
  line-height: 1.55;
  margin: 0;
}

.code-block {
  position: relative;
  margin: 1.6em 0;
  font-family: var(--font-sans);
}

.code-block pre { padding-top: 40px; }

.code-copy-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  z-index: 1;
  padding: 5px 12px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.1);
  color: #e2e8f0;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
}

.code-copy-btn:hover { background: rgba(255, 255, 255, 0.18); }

.code-copy-btn.copied {
  background: rgba(34, 197, 94, 0.25);
  color: #86efac;
}

.article-body code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--bg-subtle);
  padding: 2px 6px;
  border-radius: 3px;
}

.article-body pre code {
  background: none;
  padding: 0;
  font-size: inherit;
}

/* ── Amazon Associates CTA ── */
.amazon-box {
  margin: 40px 0 0;
  padding: 20px 22px;
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: 10px;
  max-width: 42rem;
}

.cat-hero .amazon-box {
  margin: 20px 0 0;
  background: rgba(255, 255, 255, 0.72);
}

.amazon-box__title {
  margin: 0 0 6px;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text);
}

.amazon-box__desc {
  margin: 0 0 14px;
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--muted);
}

.amazon-box__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.amazon-box__btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 11px 18px;
  font-size: 0.9rem;
  font-weight: 700;
  color: #fff;
  background: #ff9900;
  border-radius: 8px;
  text-decoration: none;
  transition: background 0.15s, transform 0.15s;
}

.amazon-box__btn:hover {
  background: #e88b00;
  color: #fff;
  transform: translateY(-1px);
}

.amazon-box__btn--rakuten {
  background: #bf0000;
}

.amazon-box__btn--rakuten:hover {
  background: #a00000;
  color: #fff;
}

.amazon-box__note {
  margin: 12px 0 0;
  font-size: 0.75rem;
  line-height: 1.45;
  color: var(--muted);
}

.article-footer {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 24px;
}

.back-link {
  display: inline-flex;
  align-items: center;
  padding: 10px 18px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--primary);
  background: var(--bg-card);
  border: 1px solid var(--border-sketch);
  border-radius: 999px;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.back-link:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-sm);
}

.back-link--secondary {
  color: var(--muted);
  background: transparent;
}

/* ── Footer ── */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 40px 24px;
  background: var(--bg-subtle);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  text-align: center;
}

.footer-brand {
  margin: 0 0 4px;
  font-size: 1rem;
}

.footer-tagline {
  margin: 0 0 16px;
  font-size: 0.85rem;
  color: var(--muted);
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-bottom: 16px;
}

.footer-links a {
  font-size: 0.875rem;
  color: var(--secondary);
  font-weight: 500;
}

.footer-links a:hover { color: var(--accent); }

.footer-copy {
  margin: 0;
  font-size: 0.8rem;
  color: var(--muted);
}

/* ── Utilities ── */
.empty-state,
.search-empty {
  text-align: center;
  color: var(--muted);
  padding: 48px 20px;
  font-size: 0.95rem;
}

.search-empty[hidden] { display: none; }

/* ── Responsive ── */
@media (max-width: 900px) {
  #latest .story-card {
    grid-template-columns: 140px 1fr;
    gap: 16px;
  }
}

@media (max-width: 768px) {
  .header-nav { display: none; }

  .nav-burger { display: flex; }

  .brand-hero { padding: 24px 0 20px; }

  .page-search {
    margin-bottom: 32px;
  }

  .page-search input {
    font-size: 0.9rem;
    padding: 12px 18px;
  }

  .story-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  #latest .story-card {
    grid-template-columns: 1fr;
  }

  #latest .story-card .story-card__cover {
    aspect-ratio: 16 / 9;
  }

  .topic-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .article-body { font-size: 1.1rem; }

  .article-hero img {
    border-radius: var(--radius-lg);
  }
}

@media (min-width: 1000px) {
  .article-layout {
    display: grid;
    grid-template-columns: minmax(240px, 280px) 1fr;
    gap: 48px;
    align-items: start;
  }

  .article--has-toc .article-back--top {
    display: none;
  }

  .article-back--sidebar {
    display: flex;
  }

  .article-back--sidebar .article-back__primary,
  .article-back--sidebar .article-back__secondary {
    justify-content: center;
    width: 100%;
    padding: 11px 16px;
    font-size: 0.875rem;
  }

  .article-sidebar {
    position: sticky;
    top: 80px;
    margin-bottom: 0;
    max-height: calc(100vh - 96px);
    overflow-y: auto;
  }

  .article {
    max-width: calc(var(--article-width) + 320px);
  }
}