/* ─────────────────────────────────────────────────────────────
   Copywriting Mesterkurzus — Expert Flow v3-dark
   COMPONENT layer only.
   Token source-of-truth: /brand.css (loaded first in HTML head).

   Iter2 status:
     • Tipográfiai tokenek (--font-sans/display/mono) brand.css-ből jönnek.
     • Itt csak komponens-specifikus tokenek (surface, radius, motion, accent variációk).
     • EGYETLEN brand-szintű override: .brand-bar fixed corner pozíció
       (lásd a 'SITE-LEVEL OVERRIDE' blokkot lent).

   Font importok:
     • Instrument Sans — brand --font-sans MASTER (body szöveg). KÖTELEZŐ betölteni,
       különben a brand.css "Instrument Sans Fallback" (Arial) metrikára esik vissza.
     • Instrument Serif — brand --font-display (címsorok, kiemelt italic).
     • JetBrains Mono — brand --font-mono (eyebrow, tag, kód).
   ───────────────────────────────────────────────────────────── */

@import url('https://fonts.googleapis.com/css2?family=Instrument+Sans:wght@400;500;600;700&family=Instrument+Serif:ital@0;1&family=JetBrains+Mono:wght@400;500&display=swap');

/* Component-only token additions (NOT in brand.css).
   Tipográfiai tokenek (--font-sans, --font-display, --font-mono) szándékosan
   NINCSENEK itt: a brand.css a master, hogy a portfólió site-jai konzisztensek
   maradjanak. Itt csak komponens-specifikus surface, radius, motion tokenek. */
:root {
  /* Komponens surface-ek — lesson cards, hover states, elevations */
  --bg-elev: #111114;
  --bg-elev-2: #16161a;
  --card: #131316;
  --card-hover: #1a1a1e;

  --border: #1f1f23;
  --border-strong: #2a2a2e;

  /* Accent variációk — a brand --accent (lavender) köré épült komponens-tónusok */
  --accent-soft: rgba(192, 192, 231, 0.10);
  --accent-strong: #d8d8f0;
  --accent-glow: rgba(192, 192, 231, 0.18);

  /* v3-dark editorial: éles sarkok mindenhol (etalon: expertflow-v3-dark.vercel.app) */
  --radius-sm: 0;
  --radius: 0;
  --radius-lg: 0;
  --radius-pill: 0;

  /* Layout */
  --container: 1200px;

  /* Motion easings — lesson hover/transition timing */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);

  /* Lesson body számára egy szerif alias — brand --font-display reuse */
  --font-serif: var(--font-display);
}

/* Body refinement (font tweaks) — brand.css already sets bg/color/family */
html, body {
  font-feature-settings: 'cv11', 'ss01';
  letter-spacing: -0.011em;
  line-height: 1.6;
}

html { scroll-behavior: smooth; }

::selection { background: var(--accent); color: var(--bg-page); }

a:focus-visible, button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: inherit;
}

img, svg { display: block; max-width: 100%; }

/* ─────────────────────────────────────────────────────────────
   SITE-LEVEL OVERRIDE: brand-bar fixed corner instead of brand.css full-width
   ─────────────────────────────────────────────────────────────
   A brand.css default `.brand-bar` egy 100% width, top border-bottom sáv
   minden Expert Flow site tetején. Itt szándékosan felülírjuk fixed top-left
   corner pozícióval, mert a kurzus-felület hero-ja teljes magasságú vizuált
   igényel. Ez az EGYETLEN brand-szintű komponens, amit ez a fájl override-ol.
   Ha másik site-ra hordoznád ezt a CSS-t, ezt a blokkot szándékosan ki kell venni.
   ───────────────────────────────────────────────────────────── */
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.55; transform: scale(0.85); }
}

/* v3-dark-stílusú keretezett fejléc (etalon: expertflow-v3-dark.vercel.app) */
.site-header {
  padding: 20px 24px 0;
  position: relative;
  z-index: 50;
}
.site-header-inner {
  max-width: var(--container);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 16px;
  border: 1px solid var(--border-strong);
  padding: 15px 24px;
  background: rgba(13, 13, 15, 0.55);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.site-logo {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 24px;
  letter-spacing: -0.02em;
  color: var(--color-foreground);
  justify-self: start;
  border-bottom: none;
}
.site-logo em { font-style: italic; color: inherit; }
.site-nav {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 22px;
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.18em;
}
.site-nav a {
  color: var(--color-foreground-muted);
  border-bottom: none;
  transition: color 0.18s var(--ease-out);
}
.site-nav a:hover, .site-nav a.active { color: var(--color-foreground); }
.site-header-link {
  justify-self: end;
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--accent);
  border-bottom: none;
  transition: color 0.18s var(--ease-out);
}
.site-header-link:hover { color: var(--accent-strong); }
@media (max-width: 760px) {
  .site-header { padding: 14px 16px 0; }
  .site-header-inner {
    grid-template-columns: 1fr;
    justify-items: center;
    gap: 10px;
    text-align: center;
    padding: 14px 18px;
  }
  .site-logo, .site-header-link { justify-self: center; }
  .site-nav { gap: 6px 10px; font-size: 10px; }
  .site-nav a {
    padding: 10px 8px;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
  }
  .site-header-link { padding: 8px; min-height: 40px; display: inline-flex; align-items: center; }
}

/* ─────────────────────────────────────────────────────────────
   Hero (homepage)
   ───────────────────────────────────────────────────────────── */
header.hero {
  padding: 72px 24px 80px;
  text-align: center;
  border-bottom: 1px solid var(--border);
  background: var(--bg-page);
  position: relative;
  overflow: hidden;
}

header.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 70% 55% at 50% 0%, rgba(192, 192, 231, 0.13), transparent 65%),
    radial-gradient(ellipse 40% 30% at 50% 100%, rgba(192, 192, 231, 0.04), transparent 70%);
  pointer-events: none;
  z-index: 0;
}

header.hero > * { position: relative; z-index: 1; }

/* Hero-specific eyebrow override (pill style instead of inline default) */
header.hero .eyebrow,
.lesson-header .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  font-family: var(--font-sans);
  font-weight: 500;
  margin-bottom: 28px;
  padding: 6px 14px;
  background: var(--accent-soft);
  border: 1px solid rgba(192, 192, 231, 0.22);
  border-radius: var(--radius-pill);
}
header.hero .eyebrow .pulse-dot,
header.hero .eyebrow .dot,
.lesson-header .eyebrow .dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent);
  animation: pulse 2s ease-in-out infinite;
}

header.hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(48px, 7.6vw, 96px);
  font-weight: 400;
  margin: 0 0 24px;
  letter-spacing: -0.025em;
  line-height: 1.02;
  color: var(--color-foreground);
  max-width: 980px;
  margin-left: auto;
  margin-right: auto;
}
header.hero h1 em {
  font-style: italic;
  color: var(--accent);
  font-weight: 400;
}

header.hero .lede {
  font-size: 19px;
  color: var(--color-foreground-muted);
  margin: 0 auto;
  max-width: 700px;
  line-height: 1.55;
}

.stats {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-top: 52px;
  flex-wrap: wrap;
}
.stat {
  background: var(--card);
  border: 1px solid var(--border);
  padding: 18px 26px;
  border-radius: 0;
  text-align: left;
  min-width: 120px;
  transition: transform 0.3s var(--ease-out), border-color 0.3s var(--ease-out);
}
.stat:hover {
  transform: translateY(-2px);
  border-color: var(--border-strong);
}
.stat b {
  font-family: var(--font-serif);
  font-size: 32px;
  font-weight: 400;
  display: block;
  color: var(--color-foreground);
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin-bottom: 4px;
}
.stat span {
  font-size: 11px;
  color: var(--color-foreground-dim);
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

/* Hero CTAs — reuse brand.css .cta and add .cta-primary / .cta-secondary variants */
.hero-ctas {
  display: flex;
  gap: 14px;
  justify-content: center;
  margin-top: 48px;
  flex-wrap: wrap;
}

.cta-primary {
  background: var(--accent-soft);
  border-color: rgba(192, 192, 231, 0.32);
  color: var(--accent-strong);
}
.cta-primary:hover {
  background: rgba(192, 192, 231, 0.18);
  border-color: var(--accent);
  transform: translateY(-1px);
}

.cta-secondary {
  background: transparent;
  border-color: var(--border-strong);
  color: var(--color-foreground-muted);
}
.cta-secondary:hover {
  border-color: var(--color-foreground-dim);
  color: var(--color-foreground);
  transform: translateY(-1px);
}

.cta .arrow {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 17px;
  transition: transform 0.22s var(--ease-out);
}
.cta:hover .arrow { transform: translateX(2px); }

/* ─────────────────────────────────────────────────────────────
   Container + sections (component layer only)
   ───────────────────────────────────────────────────────────── */
.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }

section { padding: 96px 0; border-bottom: 1px solid var(--border); }
section:last-of-type { border-bottom: 0; }

.section-header { text-align: center; margin-bottom: 56px; }
.section-header .eyebrow { margin-bottom: 16px; }
.section-header h2 {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: clamp(34px, 4.8vw, 56px);
  font-weight: 400;
  margin: 0 0 16px;
  letter-spacing: -0.022em;
  line-height: 1.1;
  border: none;
  padding: 0;
}
.section-header h2 em { font-style: italic; color: var(--accent); }
.section-header p {
  font-size: 17px;
  color: var(--color-foreground-muted);
  max-width: 640px;
  margin: 0 auto;
  line-height: 1.55;
}

/* ─────────────────────────────────────────────────────────────
   Lesson search (index.html) — P1-7
   ───────────────────────────────────────────────────────────── */
.lesson-search-wrap {
  max-width: 720px;
  margin: 0 auto 40px;
  padding: 0 24px;
}
.lesson-search {
  width: 100%;
  display: block;
  padding: 14px 18px;
  background: var(--card);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-pill);
  color: var(--color-foreground);
  font-family: var(--font-sans);
  font-size: 15px;
  transition: border-color 0.2s var(--ease-out), box-shadow 0.2s var(--ease-out);
}
.lesson-search:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(192, 192, 231, 0.15);
}
.lesson-search::placeholder { color: var(--color-foreground-dim); }

.filter-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin: 16px 0 32px;
  padding: 0 24px;
}
.filter-chip {
  background: transparent;
  border: 1px solid var(--border-strong);
  color: var(--color-foreground-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 11px 16px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: border-color 0.18s var(--ease-out), color 0.18s var(--ease-out), background 0.18s var(--ease-out);
}
.filter-chip:hover {
  color: var(--color-foreground);
  border-color: var(--color-foreground-dim);
}
.filter-chip[aria-pressed="true"] {
  background: var(--accent-soft);
  border-color: rgba(192, 192, 231, 0.32);
  color: var(--accent);
}

.cat-group.is-hidden { display: none; }

.lesson-search-empty {
  text-align: center;
  padding: 48px 24px;
  color: var(--color-foreground-dim);
  font-size: 15px;
  display: none;
}
.lesson-search-empty.is-visible { display: block; }

/* ─────────────────────────────────────────────────────────────
   Category groups
   ───────────────────────────────────────────────────────────── */
.cat-group { margin-bottom: 48px; }
.cat-group:last-child { margin-bottom: 0; }
.cat-head {
  display: flex;
  align-items: baseline;
  gap: 18px;
  padding: 18px 0 14px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 0;
}
.cat-num {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 30px;
  color: var(--accent);
  letter-spacing: -0.02em;
  line-height: 1;
}
.cat-title {
  font-family: var(--font-serif);
  font-size: clamp(22px, 2.6vw, 28px);
  font-weight: 400;
  margin: 0;
  letter-spacing: -0.015em;
  color: var(--color-foreground);
}
.cat-desc {
  margin-left: auto;
  font-size: 13px;
  color: var(--color-foreground-muted);  /* upgraded from -dim for contrast */
  letter-spacing: 0.02em;
  max-width: 50%;
  text-align: right;
}

/* ─────────────────────────────────────────────────────────────
   Lesson cards grid
   Override a brand.css cell-grid hard-border rácsát: hézagos,
   lekerekített, önálló kártyák (lágyabb, prémium érzet).
   ───────────────────────────────────────────────────────────── */
.cell-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
  gap: 16px;
  border: 0;
}
.cell-grid > * {
  border: 0;
  padding: 0;
}

.lesson-card {
  background: var(--card);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  padding: 28px 26px;
  display: flex;
  flex-direction: column;
  gap: 13px;
  transition: background 0.25s var(--ease-out), border-color 0.25s var(--ease-out), transform 0.25s var(--ease-out);
  position: relative;
  min-height: 210px;
}
.lesson-card:hover {
  background: var(--card-hover);
  border-color: rgba(192, 192, 231, 0.32);
  transform: translateY(-3px);
}
.lesson-card::after {
  content: "→";
  position: absolute;
  right: 24px;
  bottom: 22px;
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 22px;
  color: var(--accent);
  opacity: 0;
  transform: translateX(-4px);
  transition: opacity 0.25s var(--ease-out), transform 0.25s var(--ease-out);
}
.lesson-card:hover::after {
  opacity: 1;
  transform: translateX(0);
}
.lesson-card .lesson-tag {
  font-size: 10.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  font-family: var(--font-mono);
  font-weight: 500;
}
.lesson-card h3 {
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 400;
  margin: 0;
  letter-spacing: -0.018em;
  line-height: 1.18;
  color: var(--color-foreground);
}
.lesson-card h3 em { font-style: italic; color: var(--accent); }
.lesson-card p {
  font-size: 14.5px;
  color: var(--color-foreground-muted);
  line-height: 1.55;
  margin: 0;
  max-width: none;
}
.lesson-card .lesson-meta {
  margin-top: auto;
  padding-top: 12px;
  display: flex;
  gap: 14px;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-foreground-muted);
}
.lesson-card .lesson-meta span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.lesson-card .lesson-level {
  color: var(--accent);
}

/* ─────────────────────────────────────────────────────────────
   Lesson page — article
   ───────────────────────────────────────────────────────────── */
.lesson-header {
  padding: 56px 24px 52px;
  border-bottom: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}
.lesson-header::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 50% 50% at 50% 0%, rgba(192, 192, 231, 0.09), transparent 60%);
  pointer-events: none;
}
.lesson-header > * { position: relative; }

/* Semantic breadcrumb (P1-5) — supports both <nav><ol> and legacy <div> */
.lesson-header .breadcrumb,
.lesson-header nav.breadcrumb {
  text-align: center;
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-foreground-muted);
  margin-bottom: 22px;
}
.lesson-header .breadcrumb ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0;
}
.lesson-header .breadcrumb li {
  display: inline-flex;
  align-items: center;
  margin: 0;
}
.lesson-header .breadcrumb a {
  color: var(--color-foreground-muted);
  border-bottom: none;
  transition: color 0.18s var(--ease-out);
}
.lesson-header .breadcrumb a:hover { color: var(--accent); }
.lesson-header .breadcrumb .sep {
  margin: 0 10px;
  color: var(--border-strong);
}

.lesson-header h1 {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: clamp(38px, 6vw, 72px);
  font-weight: 400;
  margin: 0 auto;
  letter-spacing: -0.024em;
  line-height: 1.06;
  text-align: center;
  max-width: 920px;
  color: var(--color-foreground);
}
.lesson-header h1 em { font-style: italic; color: var(--accent); }
.lesson-header .lesson-sub {
  text-align: center;
  font-size: 18px;
  color: var(--color-foreground-muted);
  max-width: 640px;
  margin: 24px auto 0;
  line-height: 1.55;
}
.lesson-header .lesson-pill-row {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-top: 32px;
  flex-wrap: wrap;
}
.lesson-pill {
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-foreground-muted);
  padding: 6px 14px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-pill);
  background: var(--card);
}
.lesson-pill.accent {
  color: var(--accent);
  border-color: rgba(192, 192, 231, 0.32);
  background: var(--accent-soft);
}
.lesson-pill.level-beginner { color: var(--color-accent-mint); border-color: rgba(192, 216, 204, 0.28); }
.lesson-pill.level-advanced { color: var(--color-accent-rose); border-color: rgba(234, 199, 200, 0.28); }

.lesson-content {
  max-width: 68ch;
  margin: 0 auto;
  padding: 64px 24px 96px;
  font-size: 17px;
  line-height: 1.78;
  color: var(--color-foreground);
}
.lesson-content > p:first-child::first-letter {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 64px;
  color: var(--accent);
  float: left;
  line-height: 0.92;
  margin-right: 10px;
  margin-top: 6px;
  margin-bottom: -6px;
}
.lesson-content p {
  margin: 0 0 1.55em;
  color: var(--color-foreground);
  max-width: none;
}
/* Bold: only weight bump — no color accent, less visual noise */
.lesson-content strong,
.lesson-content p strong { color: inherit; font-weight: 600; }
/* Italic: single emphasis signal → lavender accent */
.lesson-content em,
.lesson-content p em { color: var(--accent); font-style: italic; }
.lesson-content a {
  color: var(--accent);
  border-bottom: 1px solid rgba(192, 192, 231, 0.32);
  transition: color 0.18s, border-color 0.18s;
}
.lesson-content a:hover {
  color: var(--accent-strong);
  border-color: var(--accent);
}

.lesson-content h2 {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: clamp(26px, 3.2vw, 36px);
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin: 3.5rem 0 1rem;
  color: var(--color-foreground);
  scroll-margin-top: 80px;
  padding-top: 0.5rem;
  border-top: 1px solid var(--border);
}
.lesson-content h2 em { font-style: italic; color: var(--accent); }

.lesson-content h3 {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: clamp(19px, 2.2vw, 24px);
  font-weight: 400;
  letter-spacing: -0.012em;
  line-height: 1.25;
  margin: 2.2rem 0 0.75rem;
  color: var(--color-foreground);
  scroll-margin-top: 80px;
}

.lesson-content h4 {
  font-size: 16px;
  font-weight: 600;
  margin: 30px 0 10px;
  letter-spacing: -0.008em;
  color: var(--color-foreground);
  text-transform: none;
}

.lesson-content ul, .lesson-content ol {
  margin: 0 0 1.5em;
  padding-left: 26px;
}
.lesson-content ul li, .lesson-content ol li {
  margin-bottom: 0.6em;
  color: var(--color-foreground);
}
.lesson-content ul li::marker { color: var(--accent); }
.lesson-content ol li::marker { color: var(--accent); font-family: var(--font-serif); font-style: italic; }

.lesson-content blockquote {
  margin: 28px 0;
  padding: 22px 28px;
  border-left: 3px solid var(--accent);
  background: var(--bg-elev);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-family: var(--font-serif);
  font-size: 21px;
  font-style: italic;
  line-height: 1.5;
  color: var(--color-foreground);
}

.lesson-content pre, .lesson-content code {
  font-family: var(--font-mono);
}
.lesson-content code {
  font-size: 14px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  padding: 1px 7px;
  border-radius: 0;
  color: var(--accent-strong);
}
.lesson-content pre {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 26px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  font-size: 13.5px;
  line-height: 1.65;
  margin: 24px 0;
  color: var(--color-foreground);
}
.lesson-content pre code {
  background: transparent;
  border: 0;
  padding: 0;
  color: inherit;
  font-size: inherit;
  display: block;
  overflow-x: auto;
  white-space: pre;
  -webkit-overflow-scrolling: touch;
}

.lesson-content hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 56px 0;
}

.lesson-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0 32px;
  font-size: 14.5px;
}
.lesson-content th, .lesson-content td {
  text-align: left;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
.lesson-content th {
  font-weight: 500;
  color: var(--accent);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  background: var(--bg-elev);
}

/* TL;DR pill card */
.tldr-card {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px 20px;
  border: 1px solid rgba(192, 192, 231, 0.28);
  background: var(--accent-soft);
  border-radius: var(--radius);
  margin: 0 0 2.5rem;
  font-size: 15px;
  line-height: 1.6;
}
.tldr-label {
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 500;
  padding-top: 2px;
}
.tldr-body { color: var(--color-foreground-muted); }

/* In-page TOC */
.lesson-toc {
  margin: 0 0 3rem;
  padding: 20px 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-elev);
}
.toc-title {
  font-size: 10.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  font-family: var(--font-mono);
  font-weight: 500;
  margin: 0 0 12px;
}
.lesson-toc ol {
  margin: 0;
  padding-left: 20px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.lesson-toc li { color: var(--color-foreground-muted); font-size: 14.5px; margin: 0; }
.lesson-toc a {
  color: var(--color-foreground-muted);
  border-bottom: none;
  transition: color 0.18s var(--ease-out);
}
.lesson-toc a:hover { color: var(--accent); }

/* Callout boxes inside lesson — extends brand.css .callout */
.lesson-content .callout {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin: 24px 0;
  border-left: 3px solid var(--accent);
}
.lesson-content .callout-accent {
  border-color: rgba(192, 192, 231, 0.32);
  background: var(--accent-soft);
}

/* ─────────────────────────────────────────────────────────────
   Accordion / lenyíló formula-kártya (::: card a markdownban)
   Egymás alá pakolt 40 formula helyett: rövid, kattintható lista.
   ───────────────────────────────────────────────────────────── */
.formula-card {
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: var(--card);
  margin: 12px 0;
  overflow: hidden;
  transition: border-color 0.2s var(--ease-out), background 0.2s var(--ease-out);
}
.formula-card[open] {
  border-color: rgba(192, 192, 231, 0.32);
  background: var(--bg-elev);
}
.formula-card > summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 22px;
  font-family: var(--font-serif);
  font-style: italic;
  font-size: clamp(18px, 2.1vw, 22px);
  line-height: 1.25;
  color: var(--color-foreground);
  letter-spacing: -0.012em;
  transition: color 0.18s var(--ease-out);
}
.formula-card > summary::-webkit-details-marker { display: none; }
.formula-card > summary:hover { color: var(--accent); }
.formula-card > summary .fc-icon {
  margin-left: auto;
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  position: relative;
  opacity: 0.7;
  transition: transform 0.25s var(--ease-out);
}
.formula-card > summary .fc-icon::before,
.formula-card > summary .fc-icon::after {
  content: "";
  position: absolute;
  background: var(--accent);
  border-radius: 2px;
}
.formula-card > summary .fc-icon::before { top: 10px; left: 3px; width: 16px; height: 2px; }
.formula-card > summary .fc-icon::after  { top: 3px; left: 10px; width: 2px; height: 16px; transition: transform 0.25s var(--ease-out); }
.formula-card[open] > summary .fc-icon::after { transform: rotate(90deg); }
.formula-card > summary .fc-tag {
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-style: normal;
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  padding: 4px 10px;
  border: 1px solid rgba(192, 192, 231, 0.28);
  border-radius: var(--radius-pill);
  background: var(--accent-soft);
}
.formula-card .fc-body {
  padding: 0 22px 20px;
  font-size: 16px;
  line-height: 1.72;
  color: var(--color-foreground);
}
.formula-card .fc-body > *:first-child { margin-top: 0; }
.formula-card .fc-body > *:last-child { margin-bottom: 0; }
.formula-card .fc-body h3,
.formula-card .fc-body h4 { margin-top: 1.2rem; }
.formula-card .fc-body blockquote {
  margin: 14px 0;
  font-size: 17px;
}
@media (prefers-reduced-motion: reduce) {
  .formula-card > summary .fc-icon,
  .formula-card > summary .fc-icon::after { transition: none; }
}

/* Bottom nav (prev/next) */
.lesson-nav {
  max-width: 68ch;
  margin: 0 auto;
  padding: 0 24px 80px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
.lesson-nav a {
  background: var(--card);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  padding: 18px 22px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: background 0.25s, border-color 0.25s, transform 0.25s;
}
.lesson-nav a:hover {
  background: var(--card-hover);
  border-color: rgba(192, 192, 231, 0.32);
  transform: translateY(-1px);
}
.lesson-nav .nav-label {
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-foreground-muted);
  font-family: var(--font-mono);
}
.lesson-nav .nav-title {
  font-family: var(--font-serif);
  font-size: 18px;
  line-height: 1.2;
  color: var(--color-foreground);
  letter-spacing: -0.012em;
}
.lesson-nav .nav-title em { font-style: italic; color: var(--accent); }
.lesson-nav a.next { text-align: right; }

/* ─────────────────────────────────────────────────────────────
   Footer
   ───────────────────────────────────────────────────────────── */
footer {
  border-top: 1px solid var(--border);
  padding: 56px 24px 40px;
  text-align: center;
  color: var(--color-foreground-muted);
  font-size: 13px;
}
footer .footer-brand {
  font-family: var(--font-serif);
  font-size: 22px;
  font-style: italic;
  color: var(--color-foreground);
  letter-spacing: -0.014em;
}
footer .footer-meta {
  margin-top: 12px;
  font-size: 12px;
  letter-spacing: 0.04em;
}
footer .footer-links {
  margin-top: 24px;
  display: flex;
  gap: 24px;
  justify-content: center;
  flex-wrap: wrap;
  font-size: 13px;
}
footer .footer-links a {
  color: var(--color-foreground-muted);
  border-bottom: none;
  transition: color 0.18s var(--ease-out);
}
footer .footer-links a:hover { color: var(--accent); }

/* ─────────────────────────────────────────────────────────────
   Reveal animations
   ───────────────────────────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
  will-change: opacity, transform;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-delay-1 { transition-delay: 80ms; }
.reveal-delay-2 { transition-delay: 160ms; }
.reveal-delay-3 { transition-delay: 240ms; }
.reveal-delay-4 { transition-delay: 320ms; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  /* Pulse animációk kikapcsolása: brand-bar dot, hero/lesson eyebrow dot — minden variáns */
    .eyebrow .dot,
  .eyebrow .pulse-dot { animation: none; }
  html { scroll-behavior: auto; }
}

/* ─────────────────────────────────────────────────────────────
   Responsive
   ───────────────────────────────────────────────────────────── */
@media (max-width: 760px) {
  header.hero { padding: 120px 18px 72px; }
  section { padding: 72px 0; }
  .container, .container-prose { padding: 0 18px; }
  .lesson-header { padding: 44px 18px 44px; }
  .lesson-content { padding: 48px 18px 72px; font-size: 16px; }
  .lesson-content blockquote { font-size: 18px; padding: 18px 22px; }
  .stat { padding: 14px 18px; min-width: 100px; }
  .stat b { font-size: 26px; }
  .cat-head { flex-direction: column; align-items: flex-start; gap: 6px; }
  .cat-desc { margin-left: 0; text-align: left; max-width: 100%; }
  .lesson-nav { grid-template-columns: 1fr; }
  .lesson-nav a.next { text-align: left; }
  .filter-chips { padding: 0 18px; }
}

/* Cell-bordered grid: hide last column right-border + bottom row bottom-border (best-effort) */
.lesson-grid .lesson-card:last-child { border-right: none; }

/* ─────────────────────────────────────────────────────────────
   Expert Flow Ecosystem footer (shared across all 7 sites)
   ───────────────────────────────────────────────────────────── */
.ecosystem-footer {
  border-top: 1px solid var(--color-border-strong);
  padding: 64px 24px 56px;
  background: var(--color-surface);
}
.ecosystem-inner {
  max-width: 1080px;
  margin: 0 auto;
}
.ecosystem-eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 10px;
}
.ecosystem-footer h3 {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 400;
  font-size: clamp(24px, 3.4vw, 32px);
  letter-spacing: -0.01em;
  margin: 0 0 28px;
  color: var(--color-foreground);
}
.ecosystem-grid {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 12px;
}
.ecosystem-grid a {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 18px;
  border: 1px solid var(--color-border-strong);
  border-radius: 0;
  color: var(--color-foreground);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.45;
  transition: border-color 0.2s ease, background 0.2s ease, transform 0.2s ease;
  background: rgba(223, 222, 218, 0.01);
}
.ecosystem-grid a strong {
  font-weight: 500;
  color: var(--color-foreground);
  font-size: 15px;
}
.ecosystem-grid a span {
  color: var(--color-foreground-soft);
  font-size: 13px;
}
.ecosystem-grid a:hover {
  border-color: var(--accent);
  background: rgba(192, 192, 231, 0.06);
  transform: translateY(-1px);
}
.ecosystem-grid a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ─────────────────────────────────────────────────────────────
   Mobile breakpoint stack — Round 3 SHARED-MOBILE-FIXES A.
   320 / 360 / 375 / 414 / 480 / 768 / 1024 explicit
   ───────────────────────────────────────────────────────────── */

/* iPad landscape — minor container-padding finomítás */
@media (max-width: 1024px) {
  .container, .container-prose { padding: 0 22px; }
  .lesson-content { max-width: 64ch; }
}

/* iPad portrait — section/lesson-content padding kisebb */
@media (max-width: 768px) {
  .lesson-content { padding: 56px 20px 80px; }
  .section-header h2 { font-size: clamp(28px, 6vw, 44px); }
  header.hero .lede { font-size: 17px; }
  .cell-grid { grid-template-columns: 1fr; }
}

/* Generic mobile (480px) — code block scrollbar, lesson cards 1-col, ecosystem grid 240px */
@media (max-width: 480px) {
  .lesson-content pre {
    padding: 18px 20px;
    padding-bottom: 14px;
    scrollbar-width: thin;
  }
  .lesson-content pre::-webkit-scrollbar { height: 6px; }
  .lesson-content pre::-webkit-scrollbar-thumb {
    background: var(--border-strong);
    border-radius: 3px;
  }
  .lesson-header .breadcrumb .sep { display: none; }
  .lesson-header .breadcrumb li::after {
    content: "›";
    margin: 0 6px;
    opacity: 0.45;
    color: var(--color-foreground-muted);
  }
  .lesson-header .breadcrumb li:last-child::after { content: none; }
  .ecosystem-grid {
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 10px;
  }
  .ecosystem-grid a { padding: 14px 16px; }
  .lesson-card { padding: 26px 22px; min-height: auto; }
  .lesson-card h3 { font-size: 21px; }
  .lesson-card .lesson-meta { font-size: 10.5px; gap: 10px; flex-wrap: wrap; }
  .filter-chip { font-size: 11px; padding: 11px 14px; }
  /* Touch targets — WCAG 2.5.5 */
  .filter-chip, .lesson-search { min-height: 44px; }
}

/* iPhone Plus / iPhone 11 (414px) */
@media (max-width: 414px) {
  header.hero { padding: 110px 16px 64px; }
  .lesson-header { padding: 40px 16px 40px; }
  .lesson-content { padding: 44px 18px 72px; font-size: 16px; }
  .stat { padding: 13px 16px; min-width: 92px; }
}

/* iPhone SE 2.gen / iPhone 13 mini (375px) — fine-tune az aktuális 374-es breakpoint
   helyén; 375-ön explicit safe-zone */
@media (max-width: 375px) {
  .lesson-content { padding: 40px 18px 64px; }
  .ecosystem-grid { grid-template-columns: 1fr; }
}

/* Older iPhone SE 1.gen / Galaxy Fold (360px) */
@media (max-width: 360px) {
  header.hero { padding: 48px 14px 48px; }
  .lesson-header { padding: 36px 14px 36px; }
  .eyebrow { font-size: 10px; letter-spacing: 0.14em; }
  .lesson-content { padding: 40px 16px 64px; font-size: 15px; }
  .stat { padding: 12px 14px; min-width: 86px; }
  .stat b { font-size: 22px; }
  .container, .container-prose { padding: 0 14px; }
  .filter-chips { padding: 0 14px; gap: 6px; }
  .filter-chip { font-size: 11px; padding: 10px 12px; }
  .ecosystem-footer { padding: 48px 16px 40px; }
  .ecosystem-grid a { padding: 14px 14px; }
  .lesson-search { font-size: 14px; }
  .lesson-card { padding: 22px 18px; }
  .lesson-card h3 { font-size: 19px; }
}

/* Smallest target — iPhone SE 1.gen narrow (320px) */
@media (max-width: 320px) {
  .lesson-content { padding: 36px 14px 56px; font-size: 14.5px; }
  .lesson-header h1 { font-size: clamp(28px, 7vw, 36px); }
  .stats { gap: 8px; }
  .stat { padding: 10px 12px; min-width: 80px; }
  .stat b { font-size: 20px; }
  .filter-chip { font-size: 10px; padding: 10px 10px; letter-spacing: 0.1em; }
  .lesson-card { padding: 20px 16px; }
  .ecosystem-footer { padding: 40px 12px 32px; }
  .ecosystem-grid a { padding: 12px 12px; font-size: 13px; }
}

/* ─────────────────────────────────────────────────────────────
   Email-capture blokk (leckék vége + index)
   ───────────────────────────────────────────────────────────── */
.capture {
  border-top: 1px solid var(--border);
  background: var(--bg-elev);
  padding: 72px 24px;
  text-align: center;
}
.capture-inner { max-width: 560px; margin: 0 auto; }
.capture-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 20px;
}
.capture-eyebrow .dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent);
  animation: pulse 2s ease-in-out infinite;
}
.capture h3 {
  font-family: var(--font-serif);
  font-size: clamp(26px, 3.6vw, 36px);
  font-weight: 400;
  letter-spacing: -0.018em;
  line-height: 1.12;
  color: var(--color-foreground);
  margin: 0 0 14px;
}
.capture h3 em { font-style: italic; color: var(--accent); }
.capture-lede {
  font-size: 15px;
  color: var(--color-foreground-muted);
  line-height: 1.55;
  margin: 0 0 28px;
}
.capture-form {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
  position: relative;
}
.capture-form input[type="email"] {
  flex: 1 1 260px;
  max-width: 340px;
  background: var(--bg-page);
  border: 1px solid var(--border-strong);
  color: var(--color-foreground);
  font-family: var(--font-sans);
  font-size: 14.5px;
  padding: 14px 16px;
  outline: none;
  transition: border-color 0.2s var(--ease-out);
}
.capture-form input[type="email"]:focus { border-color: var(--accent); }
.capture-form input[type="email"]::placeholder { color: var(--color-foreground-muted); opacity: 0.6; }
.capture-form button {
  background: var(--color-foreground);
  color: var(--bg-page);
  border: 1px solid var(--color-foreground);
  font-family: var(--font-mono);
  font-size: 11.5px;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  padding: 14px 22px;
  cursor: pointer;
  transition: opacity 0.2s var(--ease-out);
}
.capture-form button:hover { opacity: 0.88; }
.capture-form button:disabled { opacity: 0.5; cursor: wait; }
.capture-status {
  min-height: 20px;
  margin: 14px 0 0;
  font-size: 13.5px;
  color: var(--color-foreground-muted);
}
.capture-status.ok { color: var(--accent-strong); }
.capture-status.err { color: #e89a9a; }

/* ─────────────────────────────────────────────────────────────
   Prompt-másoló gomb (lesson <pre> blokkok)
   ───────────────────────────────────────────────────────────── */
.lesson-content pre { position: relative; }
.copy-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  background: var(--bg-page);
  border: 1px solid var(--border-strong);
  color: var(--color-foreground-muted);
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  padding: 6px 12px;
  cursor: pointer;
  transition: color 0.18s var(--ease-out), border-color 0.18s var(--ease-out);
}
.copy-btn:hover { color: var(--color-foreground); border-color: var(--accent); }
.copy-btn.copied { color: var(--accent-strong); border-color: var(--accent); }

/* Következő lecke kártya — finom accent-kiemelés */
.lesson-nav a.next { border-color: rgba(192, 192, 231, 0.35); }
.lesson-nav a.next .nav-label { color: var(--accent); }