/* ─────────────────────────────────────────────────────────────
   Blog dei corsi di Claude — stili
   Editorial minimal · warm cream/ink/terracotta
   ───────────────────────────────────────────────────────────── */

@import url('https://fonts.googleapis.com/css2?family=Newsreader:ital,opsz,wght@0,6..72,300..700;1,6..72,300..700&family=IBM+Plex+Sans:wght@400;500;600&family=IBM+Plex+Mono:wght@400;500&display=swap');

.blog {
  /* light defaults */
  --paper:      #faf6ef;
  --paper-2:    #f3ecdf;
  --paper-3:    #ece3d2;
  --ink:        #1c1a17;
  --ink-2:      #44403a;
  --muted:      #8a8378;
  --rule:       #e3dac6;
  --rule-2:     #d5cab2;
  --accent:     #b34c2d;
  --accent-2:   #d76a45;
  --highlight:  #f3e3a4;

  --serif: 'Newsreader', 'Times New Roman', Georgia, serif;
  --sans:  'IBM Plex Sans', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  --mono:  'IBM Plex Mono', 'SF Mono', Menlo, monospace;

  --container: 1200px;
  --read-width: 680px;

  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.blog.dark {
  --paper:      #15130f;
  --paper-2:    #1c1916;
  --paper-3:    #25201b;
  --ink:        #f3ede1;
  --ink-2:      #c4bcae;
  --muted:      #807a6f;
  --rule:       #2a2520;
  --rule-2:     #3a342d;
  --accent:     #e6845f;
  --accent-2:   #f0a285;
  --highlight:  #6b5a1e;
}

.blog * { box-sizing: border-box; }
.blog button { font: inherit; color: inherit; }
.blog a { color: inherit; text-decoration: none; }
.blog ::selection { background: var(--accent); color: var(--paper); }

/* ─── Reading progress bar ───────────────────────────────── */
.blog__progress {
  position: sticky; top: 0; left: 0; right: 0; z-index: 60;
  height: 3px; background: transparent;
}
.blog__progress > div {
  height: 100%; background: var(--accent);
  transition: width .12s linear;
}

/* ─── Attribution banner ────────────────────────────────── */
.attribution-banner {
  background: var(--paper-3);
  border-bottom: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .04em;
  color: var(--ink-2);
  text-transform: uppercase;
  padding: 7px 24px;
  text-align: center;
}
.attribution-banner b { color: var(--accent); font-weight: 500; }
.attribution-banner .short { display: none; }
.blog.mobile .attribution-banner { padding: 6px 14px; font-size: 10px; letter-spacing: .03em; }
.blog.mobile .attribution-banner .full { display: none; }
.blog.mobile .attribution-banner .short { display: inline; }

/* ─── Header / Nav ──────────────────────────────────────── */
.nav {
  position: sticky; top: 3px; z-index: 50;
  background: color-mix(in oklab, var(--paper), transparent 8%);
  backdrop-filter: blur(12px) saturate(140%);
  -webkit-backdrop-filter: blur(12px) saturate(140%);
  border-bottom: 1px solid var(--rule);
}
.nav__row {
  max-width: var(--container);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex; align-items: center; gap: 24px;
}
.nav__brand {
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 500;
  letter-spacing: -.01em;
  display: flex; align-items: center; gap: 12px;
  cursor: pointer;
}
.nav__brand-logo {
  width: 42px;
  height: 42px;
  object-fit: contain;
  flex: 0 0 auto;
  filter: drop-shadow(0 10px 18px rgba(0, 0, 0, 0.12));
}
.nav__brand-copy {
  display: flex;
  flex-direction: column;
  gap: 1px;
  min-width: 0;
}
.nav__brand-title {
  display: block;
  line-height: 1;
}
.nav__brand .ital {
  display: block;
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 500;
}
.nav__links { display: flex; gap: 20px; margin-left: auto; align-items: center; }
.nav__links a {
  font-size: 13px; color: var(--ink-2); cursor: pointer;
  padding: 4px 0; border-bottom: 1px solid transparent;
}
.nav__links a:hover { color: var(--ink); border-bottom-color: var(--accent); }
.nav__links a.active { color: var(--ink); border-bottom-color: var(--accent); }

.icon-btn {
  width: 34px; height: 34px; border-radius: 8px; border: 1px solid var(--rule);
  background: transparent; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  color: var(--ink-2); transition: all .15s;
}
.icon-btn:hover { border-color: var(--rule-2); color: var(--ink); background: var(--paper-2); }
.icon-btn svg { width: 16px; height: 16px; }

.theme-switch {
  appearance: none;
  border: 1px solid var(--rule);
  background: var(--paper-2);
  color: var(--ink-2);
  border-radius: 999px;
  padding: 6px 10px;
  min-width: 88px;
  height: 42px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  transition: border-color .18s ease, background .18s ease, color .18s ease, box-shadow .18s ease;
}
.theme-switch:hover {
  border-color: var(--rule-2);
  color: var(--ink);
  box-shadow: 0 10px 24px -18px color-mix(in oklab, var(--accent), transparent 45%);
}
.theme-switch:focus-visible {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in oklab, var(--accent), transparent 75%);
}
.theme-switch__icon {
  width: 16px;
  height: 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: color .18s ease, opacity .18s ease;
}
.theme-switch__icon svg {
  width: 16px;
  height: 16px;
}
.theme-switch__track {
  position: relative;
  width: 34px;
  height: 20px;
  flex: 0 0 auto;
  border-radius: 999px;
  background: color-mix(in oklab, var(--ink), transparent 72%);
  transition: background .18s ease;
}
.theme-switch__thumb {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--paper);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.18);
  transition: transform .18s ease, background .18s ease;
}
.theme-switch.is-light .theme-switch__icon--sun,
.theme-switch.is-dark .theme-switch__icon--moon {
  color: var(--accent);
  opacity: 1;
}
.theme-switch.is-light .theme-switch__icon--moon,
.theme-switch.is-dark .theme-switch__icon--sun {
  opacity: 0.55;
}
.theme-switch.is-dark .theme-switch__track {
  background: color-mix(in oklab, var(--accent), var(--paper) 38%);
}
.theme-switch.is-dark .theme-switch__thumb {
  transform: translateX(14px);
}

/* ─── Home / Hero ──────────────────────────────────────── */
.hero { max-width: var(--container); margin: 0 auto; padding: 80px 24px 48px; }
.hero__kicker {
  font-family: var(--mono); font-size: 12px;
  letter-spacing: .12em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 16px;
}
.hero__title {
  font-family: var(--serif);
  font-size: clamp(40px, 6.5vw, 84px);
  line-height: 1.02;
  letter-spacing: -.02em;
  font-weight: 400;
  margin: 0 0 24px;
  text-wrap: balance;
}
.hero__title em {
  font-style: italic;
  color: var(--accent);
  font-weight: 300;
}
.hero__lede {
  font-family: var(--serif);
  font-size: clamp(18px, 1.6vw, 22px);
  line-height: 1.5;
  color: var(--ink-2);
  max-width: 620px;
  margin: 0;
}
.hero__meta {
  display: flex; gap: 32px; margin-top: 40px;
  font-family: var(--mono); font-size: 11px;
  text-transform: uppercase; letter-spacing: .08em;
  color: var(--muted);
}
.hero__meta b { color: var(--ink); font-weight: 500; font-family: var(--mono); }

/* ─── Courses grid ─────────────────────────────────────── */
.section-head {
  max-width: var(--container);
  margin: 56px auto 24px;
  padding: 0 24px;
  display: flex; align-items: baseline; justify-content: space-between;
  border-top: 1px solid var(--rule);
  padding-top: 32px;
}
.section-head h2 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 32px;
  letter-spacing: -.01em;
  margin: 0;
}
.section-head .count {
  font-family: var(--mono); font-size: 11px; color: var(--muted);
  text-transform: uppercase; letter-spacing: .08em;
}

.courses {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px 80px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.course-card {
  background: var(--paper-2);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 32px 32px 28px;
  cursor: pointer;
  transition: all .2s;
  position: relative;
  overflow: hidden;
  display: flex; flex-direction: column;
  min-height: 260px;
}
.course-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 14px 40px -20px color-mix(in oklab, var(--accent), transparent 60%);
}
.course-card__num {
  font-family: var(--mono); font-size: 11px;
  color: var(--accent);
  letter-spacing: .08em;
}
.course-card__title {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 30px;
  line-height: 1.1;
  letter-spacing: -.015em;
  margin: 8px 0 12px;
}
.course-card__title em { font-style: italic; color: var(--ink-2); font-weight: 300; }
.course-card__desc {
  color: var(--ink-2);
  font-size: 14.5px;
  margin-bottom: 24px;
  flex: 1;
}
.course-card__meta {
  display: flex; gap: 16px; align-items: center;
  font-family: var(--mono); font-size: 11px;
  text-transform: uppercase; letter-spacing: .08em;
  color: var(--muted);
  padding-top: 16px;
  border-top: 1px dashed var(--rule);
}
.course-card__meta b { color: var(--ink-2); font-weight: 500; }
.course-card__arrow {
  position: absolute; top: 32px; right: 32px;
  color: var(--muted); transition: all .2s;
}
.course-card:hover .course-card__arrow { color: var(--accent); transform: translate(2px, -2px); }

/* ─── Course detail ─────────────────────────────────────── */
.course-detail { max-width: var(--container); margin: 0 auto; padding: 56px 24px 80px; }
.crumbs {
  font-family: var(--mono); font-size: 11px;
  text-transform: uppercase; letter-spacing: .08em;
  color: var(--muted);
  display: flex; gap: 8px; align-items: center;
  margin-bottom: 24px;
}
.crumbs a { cursor: pointer; }
.crumbs a:hover { color: var(--accent); }
.crumbs .sep { opacity: .5; }
.crumbs .here { color: var(--ink); }

.course-detail__title {
  font-family: var(--serif);
  font-size: clamp(40px, 5vw, 64px);
  line-height: 1.05;
  letter-spacing: -.02em;
  font-weight: 400;
  margin: 0 0 16px;
  max-width: 800px;
}
.course-detail__title em { font-style: italic; color: var(--accent); }
.course-detail__lede {
  font-family: var(--serif);
  font-size: 19px;
  color: var(--ink-2);
  max-width: 660px;
  margin: 0 0 32px;
}
.course-detail__stats {
  display: flex; gap: 32px;
  padding: 20px 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  margin-bottom: 48px;
  font-family: var(--mono); font-size: 11px;
  text-transform: uppercase; letter-spacing: .08em;
  color: var(--muted);
}
.course-detail__stats b { color: var(--ink); font-weight: 500; }
.course-disclaimer {
  background: var(--paper-2);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--accent);
  border-radius: 4px;
  padding: 14px 18px;
  font-size: 13.5px;
  color: var(--ink-2);
  margin-bottom: 48px;
  font-family: var(--sans);
}
.course-disclaimer b { color: var(--ink); font-weight: 500; }

.chapter-list { display: flex; flex-direction: column; }
.chapter-row {
  display: grid;
  grid-template-columns: 60px 1fr auto;
  gap: 32px;
  padding: 28px 0;
  border-bottom: 1px solid var(--rule);
  cursor: pointer;
  align-items: start;
  transition: background .15s;
}
.chapter-row:hover { background: color-mix(in oklab, var(--paper-2), transparent 50%); }
.chapter-row:hover .chapter-row__title { color: var(--accent); }
.chapter-row__num {
  font-family: var(--mono); font-size: 13px;
  color: var(--muted);
  letter-spacing: .04em;
  padding-top: 4px;
}
.chapter-row__title {
  font-family: var(--serif);
  font-size: 24px;
  font-weight: 400;
  margin: 0 0 6px;
  letter-spacing: -.01em;
  transition: color .15s;
}
.chapter-row__desc { color: var(--ink-2); font-size: 14.5px; margin: 0 0 12px; }
.chapter-row__sections {
  display: flex; flex-wrap: wrap; gap: 12px;
  font-family: var(--mono); font-size: 11px;
  color: var(--muted);
}
.chapter-row__sections span:before { content: '§ '; opacity: .6; }
.chapter-row__meta {
  font-family: var(--mono); font-size: 11px;
  text-transform: uppercase; letter-spacing: .08em;
  color: var(--muted);
  text-align: right;
  padding-top: 4px;
}

/* ─── Chapter / Reading view ────────────────────────────── */
.chapter-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 56px;
  max-width: var(--container);
  margin: 0 auto;
  padding: 56px 24px 160px;
}

.toc {
  position: sticky;
  top: 70px;
  align-self: start;
  max-height: calc(100vh - 90px);
  overflow-y: auto;
  padding-right: 16px;
  border-right: 1px solid var(--rule);
}
.toc__label {
  font-family: var(--mono); font-size: 11px;
  text-transform: uppercase; letter-spacing: .08em;
  color: var(--muted);
  margin-bottom: 16px;
}
.toc__course {
  font-family: var(--serif); font-size: 15px;
  margin-bottom: 24px; color: var(--ink-2);
  font-style: italic;
}
.toc__chapters { display: flex; flex-direction: column; gap: 0; }
.toc__chap {
  font-family: var(--serif); font-size: 14.5px;
  padding: 10px 0;
  color: var(--ink-2);
  cursor: pointer;
  border-bottom: 1px dashed var(--rule);
}
.toc__chap.current { color: var(--accent); font-weight: 500; }
.toc__chap:hover { color: var(--ink); }
.toc__sections {
  display: flex; flex-direction: column; gap: 6px;
  margin: 10px 0 12px 12px;
  padding-left: 12px;
  border-left: 1px solid var(--rule);
}
.toc__section {
  font-family: var(--sans); font-size: 13px;
  color: var(--muted); cursor: pointer;
  padding: 3px 0;
  line-height: 1.4;
}
.toc__section:hover { color: var(--ink); }
.toc__section.current { color: var(--accent); }

.chapter-article { max-width: var(--read-width); min-width: 0; }
.chapter-article__kicker {
  font-family: var(--mono); font-size: 11px;
  text-transform: uppercase; letter-spacing: .08em;
  color: var(--accent);
  margin-bottom: 16px;
}
.chapter-article__title {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(36px, 4.4vw, 56px);
  line-height: 1.05;
  letter-spacing: -.02em;
  margin: 0 0 20px;
  text-wrap: balance;
}
.chapter-article__lede {
  font-family: var(--serif);
  font-size: 20px;
  line-height: 1.5;
  color: var(--ink-2);
  margin: 0 0 32px;
  font-style: italic;
}
.chapter-article__meta {
  display: flex; gap: 24px; align-items: center;
  padding: 16px 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  font-family: var(--mono); font-size: 11px;
  text-transform: uppercase; letter-spacing: .08em;
  color: var(--muted);
  margin-bottom: 48px;
}
.chapter-article__meta b { color: var(--ink); font-weight: 500; }
.chapter-article__meta .spacer { flex: 1; }
.chapter-article__meta button {
  font-family: var(--mono); font-size: 11px;
  text-transform: uppercase; letter-spacing: .08em;
  background: transparent; border: 1px solid var(--rule);
  padding: 6px 10px; border-radius: 4px;
  display: inline-flex; align-items: center; gap: 6px;
  color: var(--ink-2); cursor: pointer;
}
.chapter-article__meta button:hover { border-color: var(--accent); color: var(--accent); }
.chapter-article__meta button.active { border-color: var(--accent); color: var(--accent); background: color-mix(in oklab, var(--accent), transparent 92%); }

.chapter-disclaimer {
  background: var(--paper-2);
  border-left: 2px solid var(--accent);
  padding: 12px 16px;
  font-size: 13px;
  color: var(--ink-2);
  font-family: var(--sans);
  margin-bottom: 40px;
  font-style: italic;
}

/* Article body */
.prose { font-family: var(--serif); font-size: 19px; line-height: 1.65; color: var(--ink); }
.prose h2 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 30px;
  letter-spacing: -.01em;
  margin: 56px 0 16px;
  scroll-margin-top: 90px;
  position: relative;
}
.prose h2:before {
  content: '§ ' counter(section);
  counter-increment: section;
  display: block;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 6px;
}
.prose { counter-reset: section; }
.prose h3 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 22px;
  margin: 32px 0 12px;
}
.prose p { margin: 0 0 20px; text-wrap: pretty; }
.prose p:first-of-type::first-letter {
  font-family: var(--serif);
  font-size: 64px;
  float: left;
  line-height: .9;
  padding: 4px 8px 0 0;
  color: var(--accent);
  font-weight: 400;
}
.prose ul, .prose ol { margin: 0 0 24px; padding-left: 24px; }
.prose li { margin-bottom: 8px; }
.prose .article-list { margin-top: 4px; }
.prose .article-list li::marker { color: var(--accent); }
.prose .article-image {
  margin: 22px 0 30px;
}
.prose .article-image img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 8px;
  border: 1px solid var(--rule);
  background: #1c1c1b;
}
.prose .article-table-wrap {
  margin: 28px 0 30px;
  overflow-x: auto;
  border: 1px solid var(--rule);
  border-radius: 14px;
  background: linear-gradient(180deg, color-mix(in oklab, var(--paper-2), white 10%), var(--paper));
  box-shadow: 0 14px 34px rgba(13, 31, 46, 0.06);
}
.prose .article-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 720px;
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.5;
}
.prose .article-table th,
.prose .article-table td {
  padding: 14px 16px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--rule);
}
.prose .article-table th {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  background: color-mix(in oklab, var(--paper-3), white 8%);
}
.prose .article-table tbody tr:last-child td {
  border-bottom: none;
}
.prose .article-table tbody tr:nth-child(even) td {
  background: color-mix(in oklab, var(--paper-2), transparent 25%);
}
.prose strong { font-weight: 600; color: var(--ink); }
.prose em { font-style: italic; }
.prose a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid color-mix(in oklab, var(--accent), transparent 38%);
  box-shadow: inset 0 -0.08em 0 color-mix(in oklab, var(--accent), transparent 86%);
  transition: color .15s ease, border-color .15s ease, box-shadow .15s ease;
}
.prose a:hover {
  color: var(--ink);
  border-bottom-color: var(--accent);
  box-shadow: inset 0 -0.16em 0 color-mix(in oklab, var(--accent), transparent 76%);
}
.prose blockquote {
  border-left: 2px solid var(--accent);
  margin: 24px 0;
  padding: 8px 0 8px 20px;
  font-style: italic;
  color: var(--ink-2);
}
.prose .article-quote {
  position: relative;
  margin: 28px 0;
  padding: 22px 26px 22px 30px;
  border: 1px solid color-mix(in oklab, var(--accent), var(--rule) 72%);
  border-radius: 14px;
  border-left-width: 5px;
  background:
    linear-gradient(135deg, color-mix(in oklab, var(--paper-2), white 18%), color-mix(in oklab, var(--paper), var(--accent) 4%));
  box-shadow: 0 16px 38px rgba(13, 31, 46, 0.08);
  font-family: var(--serif);
  font-size: clamp(20px, 2.6vw, 28px);
  line-height: 1.55;
  letter-spacing: -0.01em;
  color: var(--ink);
  text-wrap: pretty;
}
.prose .article-quote::before {
  content: "“";
  position: absolute;
  top: 10px;
  left: 12px;
  font-family: var(--serif);
  font-size: 54px;
  line-height: 1;
  color: color-mix(in oklab, var(--accent), white 15%);
  opacity: 0.9;
}
.prose .article-quote::after {
  content: "Nota personale";
  display: block;
  margin-top: 14px;
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  font-style: normal;
}
.prose code {
  font-family: var(--mono);
  font-size: 14px;
  background: var(--paper-2);
  padding: 2px 6px;
  border-radius: 3px;
  border: 1px solid var(--rule);
}
.prose pre {
  background: var(--paper-2);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 16px 18px;
  overflow-x: auto;
  margin: 24px 0;
  font-family: var(--mono);
  font-size: 14px;
  line-height: 1.5;
}
.prose pre code { background: none; border: none; padding: 0; }
.prose .callout {
  background: var(--paper-2);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 20px 22px;
  margin: 28px 0;
  font-size: 17px;
}
.prose .callout__label {
  font-family: var(--mono); font-size: 11px;
  text-transform: uppercase; letter-spacing: .08em;
  color: var(--accent);
  margin-bottom: 8px;
}
.prose .roadmap-block {
  margin: 28px 0 36px;
  padding: 24px 24px 20px;
  background:
    linear-gradient(180deg, color-mix(in oklab, var(--paper-2), transparent 8%), var(--paper-2));
  border: 1px solid var(--rule);
  border-radius: 10px;
}
.prose .roadmap-block__eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--accent);
  margin-bottom: 18px;
}
.prose .roadmap-block__list {
  display: grid;
  gap: 16px;
}
.prose .roadmap-step {
  display: grid;
  grid-template-columns: 18px 1fr;
  gap: 16px;
  align-items: start;
}
.prose .roadmap-step__rail {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100%;
}
.prose .roadmap-step__dot {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: var(--accent);
  box-shadow: 0 0 0 4px color-mix(in oklab, var(--accent), transparent 84%);
  margin-top: 7px;
}
.prose .roadmap-step__line {
  width: 1px;
  flex: 1;
  margin-top: 8px;
  background: linear-gradient(180deg, var(--accent), color-mix(in oklab, var(--accent), transparent 82%));
}
.prose .roadmap-step__label {
  font-family: var(--sans);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -.01em;
  color: var(--ink);
  margin-bottom: 4px;
}
.prose .roadmap-step__text {
  margin: 0;
  font-size: 17px;
  line-height: 1.55;
  color: var(--ink-2);
}

/* TTS reading highlight */
.prose .reading {
  background: color-mix(in oklab, var(--highlight), transparent 30%);
  box-shadow: 0 0 0 4px color-mix(in oklab, var(--highlight), transparent 30%);
  border-radius: 2px;
  transition: background .2s;
}

/* Note */
.note-panel {
  background: var(--paper-2);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 16px 18px;
  margin: 32px 0;
}
.note-panel__label {
  font-family: var(--mono); font-size: 11px;
  text-transform: uppercase; letter-spacing: .08em;
  color: var(--accent);
  margin-bottom: 8px;
  display: flex; align-items: center; gap: 8px;
}
.note-panel textarea {
  width: 100%;
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 10px 12px;
  font-family: var(--serif);
  font-size: 15px;
  color: var(--ink);
  resize: vertical;
  min-height: 80px;
  outline: none;
}
.note-panel textarea:focus { border-color: var(--accent); }

/* Prev/next nav */
.prev-next {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 80px;
  padding-top: 40px;
  border-top: 1px solid var(--rule);
}
.prev-next a {
  background: var(--paper-2);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 20px 22px;
  cursor: pointer;
  display: block;
  transition: all .15s;
}
.prev-next a:hover { border-color: var(--accent); transform: translateY(-1px); }
.prev-next a.next { text-align: right; }
.prev-next a.disabled { opacity: .4; pointer-events: none; }
.prev-next__label {
  font-family: var(--mono); font-size: 11px;
  text-transform: uppercase; letter-spacing: .08em;
  color: var(--muted);
  margin-bottom: 6px;
}
.prev-next__title {
  font-family: var(--serif);
  font-size: 18px;
  letter-spacing: -.01em;
}

/* ─── Floating TTS player ───────────────────────────────── */
.tts-player {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--paper);
  border: 1px solid var(--rule-2);
  border-radius: 100px;
  padding: 8px 10px 8px 14px;
  box-shadow: 0 12px 40px -8px color-mix(in oklab, var(--ink), transparent 80%), 0 2px 8px -2px color-mix(in oklab, var(--ink), transparent 88%);
  display: flex; align-items: center; gap: 12px;
  z-index: 100;
  max-width: calc(100% - 32px);
  font-family: var(--sans);
}
.tts-player.dark, .blog.dark .tts-player {
  background: var(--paper-3);
}
.tts-player__title {
  font-family: var(--serif);
  font-size: 14px;
  color: var(--ink);
  max-width: 200px;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.tts-player__sub {
  font-family: var(--mono); font-size: 10px;
  color: var(--muted);
  text-transform: uppercase; letter-spacing: .08em;
}
.tts-btn {
  width: 36px; height: 36px; border-radius: 50%;
  background: var(--accent);
  border: none;
  color: white;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: transform .12s;
}
.tts-btn:hover { transform: scale(1.05); }
.tts-btn svg { width: 14px; height: 14px; }
.tts-btn--ghost {
  background: transparent; color: var(--ink-2);
  width: 32px; height: 32px;
}
.tts-btn--ghost:hover { color: var(--ink); background: var(--paper-2); }
.tts-speed {
  font-family: var(--mono); font-size: 11px;
  color: var(--ink-2); cursor: pointer;
  background: var(--paper-2);
  border: 1px solid var(--rule);
  border-radius: 100px;
  padding: 4px 10px;
  min-width: 42px;
  text-align: center;
}
.tts-speed:hover { border-color: var(--accent); color: var(--accent); }
.tts-divider {
  width: 1px; height: 20px; background: var(--rule);
}
.tts-voice {
  display: flex;
  align-items: center;
}
.tts-voice select {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-2);
  cursor: pointer;
  background: var(--paper-2);
  border: 1px solid var(--rule);
  border-radius: 100px;
  padding: 5px 28px 5px 10px;
  max-width: 170px;
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  background-image:
    linear-gradient(45deg, transparent 50%, currentColor 50%),
    linear-gradient(135deg, currentColor 50%, transparent 50%);
  background-position:
    calc(100% - 14px) calc(50% - 2px),
    calc(100% - 9px) calc(50% - 2px);
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
}
.tts-voice select:hover,
.tts-voice select:focus {
  border-color: var(--accent);
  color: var(--accent);
  outline: none;
}

/* ─── Footer ───────────────────────────────────────────── */
.footer {
  border-top: 1px solid var(--rule);
  background: var(--paper-2);
  padding: 48px 24px 32px;
  margin-top: 80px;
}
.footer__inner {
  max-width: var(--container); margin: 0 auto;
  display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 48px;
}
.footer__brand {
  font-family: var(--serif); font-size: 22px; font-weight: 500;
  display: flex; align-items: center; gap: 10px;
  margin-bottom: 12px;
}
.footer__brand-logo {
  width: 30px;
  height: 30px;
  object-fit: contain;
  flex: 0 0 auto;
}
.footer__attr {
  font-family: var(--serif); font-size: 14px;
  color: var(--ink-2);
  max-width: 380px;
  line-height: 1.55;
  font-style: italic;
}
.footer h4 {
  font-family: var(--mono); font-size: 11px;
  text-transform: uppercase; letter-spacing: .08em;
  color: var(--muted);
  margin: 0 0 16px;
  font-weight: 500;
}
.footer ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 10px; }
.footer li { font-size: 14px; color: var(--ink-2); cursor: pointer; }
.footer li:hover { color: var(--accent); }
.footer__bottom {
  max-width: var(--container); margin: 32px auto 0;
  padding-top: 24px;
  border-top: 1px solid var(--rule);
  display: flex; justify-content: space-between;
  font-family: var(--mono); font-size: 11px;
  text-transform: uppercase; letter-spacing: .08em;
  color: var(--muted);
}

/* ─── About page ───────────────────────────────────────── */
.about { max-width: var(--read-width); margin: 0 auto; padding: 80px 24px 80px; }
.about h1 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(36px, 5vw, 60px);
  letter-spacing: -.02em;
  margin: 0 0 24px;
}
.about .prose { font-size: 18px; }
.about__disclaimer {
  background: var(--paper-2);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 24px;
  margin: 32px 0;
}
.about__disclaimer .label {
  font-family: var(--mono); font-size: 11px; color: var(--accent);
  text-transform: uppercase; letter-spacing: .08em;
  margin-bottom: 8px;
}

/* ─── Mobile adaptations ───────────────────────────────── */
.blog.mobile .nav__row { padding: 12px 16px; }
.blog.mobile .nav__brand { gap: 10px; }
.blog.mobile .nav__brand-logo { width: 36px; height: 36px; }
.blog.mobile .nav__brand .ital { font-size: 10px; letter-spacing: .1em; }
.blog.mobile .nav__links a { display: none; }
.blog.mobile .nav__links a.always-show,
.blog.mobile .nav__links .icon-btn,
.blog.mobile .nav__links .theme-switch { display: flex; }
.blog.mobile .theme-switch {
  min-width: 78px;
  height: 38px;
  padding: 5px 9px;
}
.blog.mobile .hero { padding: 32px 16px 24px; }
.blog.mobile .hero__meta { gap: 16px; flex-wrap: wrap; }
.blog.mobile .section-head { padding: 24px 16px 0; margin: 32px auto 16px; }
.blog.mobile .courses { grid-template-columns: 1fr; padding: 0 16px 48px; gap: 16px; }
.blog.mobile .course-card { padding: 24px; min-height: auto; }
.blog.mobile .course-card__title { font-size: 26px; }
.blog.mobile .course-detail { padding: 28px 16px 48px; }
.blog.mobile .chapter-row { grid-template-columns: 32px 1fr; gap: 12px; }
.blog.mobile .chapter-row__meta { grid-column: 2; text-align: left; padding-top: 8px; }
.blog.mobile .chapter-layout {
  grid-template-columns: 1fr;
  padding: 24px 16px 120px;
  gap: 24px;
}
.blog.mobile .toc {
  position: static; max-height: none;
  border-right: none;
  border-bottom: 1px solid var(--rule);
  padding: 0 0 20px;
  overflow: visible;
}
.blog.mobile .chapter-article { max-width: 100%; }
.blog.mobile .prose { font-size: 17px; line-height: 1.6; }
.blog.mobile .prose h2 { font-size: 24px; margin-top: 36px; }
.blog.mobile .prose p:first-of-type::first-letter { font-size: 48px; }
.blog.mobile .prose .article-table { min-width: 640px; font-size: 14px; }
.blog.mobile .prose .article-table th,
.blog.mobile .prose .article-table td { padding: 12px 13px; }
.blog.mobile .prose .roadmap-block { padding: 18px 16px 14px; }
.blog.mobile .prose .roadmap-step { grid-template-columns: 14px 1fr; gap: 12px; }
.blog.mobile .prose .roadmap-step__label { font-size: 14px; }
.blog.mobile .prose .roadmap-step__text { font-size: 16px; }
.blog.mobile .prev-next { grid-template-columns: 1fr; }
.blog.mobile .footer__inner { grid-template-columns: 1fr; gap: 32px; }
.blog.mobile .footer__bottom { flex-direction: column; gap: 8px; }
.blog.mobile .tts-player { bottom: 44px; padding: 6px 8px 6px 12px; gap: 8px; }
.blog.mobile .tts-player__title { max-width: 120px; font-size: 13px; }
.blog.mobile .tts-voice select { max-width: 120px; }
.blog.mobile .about { padding: 32px 16px; }
.blog.mobile .chapter-article__meta { flex-wrap: wrap; gap: 12px; }
.blog.mobile .chapter-article__meta .spacer { display: none; }

/* Toc collapsed on mobile by default — show toggle */
.blog.mobile .toc__toggle {
  display: flex; width: 100%;
  align-items: center; justify-content: space-between;
  background: var(--paper-2);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 12px 14px;
  font-family: var(--mono); font-size: 11px;
  text-transform: uppercase; letter-spacing: .08em;
  color: var(--ink-2);
  cursor: pointer;
}
.toc__toggle { display: none; }
.blog.mobile .toc__inner.collapsed { display: none; }
.blog.mobile .toc__inner { margin-top: 12px; }

/* Scrollbar styling inside scrollable previews */
.blog-scroll { overflow-y: auto; height: 100%; }
.blog-scroll::-webkit-scrollbar { width: 8px; }
.blog-scroll::-webkit-scrollbar-thumb { background: var(--rule-2); border-radius: 4px; }
.blog-scroll::-webkit-scrollbar-track { background: transparent; }