/* ============================================================
   R & Seurat Academy — The AI Daily Brief (aidailybrief.ai) Edition
   Editorial Neo-Brutalist Broadsheet Design System
   ============================================================ */
:root {
  /* Core aidailybrief.ai warm newsprint & ink tokens */
  --bg: #f1e5d0;
  --bg-top: #f9f1e2;
  --card: #fffdf7;
  --panel: #1d1610;
  --cream: #f5ecd7;
  --ink: #1c150d;
  --line: #d9c8a6;
  --line-card: #dccdb0;
  --line-dark: #4a3a28;
  --muted: #6f5f46;
  --muted-dim: #9b8a6f;
  --on-dark: #cabd9f;
  --on-dark-dim: #8b7d64;
  --amber: #e8902e;
  --green: #54b441;
  --red: #df5236;
  --cyan: #1f9e8e;
  --teal: #1f9e8e;

  /* Mapped application tokens */
  --surface: var(--card);
  --surface-2: var(--cream);
  --surface-3: #e7d8bc;
  --border: var(--line);
  --border-strong: var(--ink);
  --border-ink: #1c150d;
  --text: var(--ink);
  --text-2: #3d3122;
  --text-3: var(--muted);

  --accent: var(--teal);
  --accent-soft: #dff1ec;
  --ok: #2d7a1f;
  --ok-badge: var(--green);
  --ok-soft: #e4f3df;
  --warn: #b36200;
  --warn-badge: var(--amber);
  --warn-soft: #fbedd6;
  --bad: #c93b20;
  --bad-badge: var(--red);
  --bad-soft: #fce4de;

  --code-bg: #f5ecd7;
  --out-bg: #1d1610;
  --out-text: #f5ecd7;

  --shadow-sm: 4px 4px 0 var(--border-ink);
  --shadow: 8px 8px 0 var(--border-ink);
  --radius: 0px;
  --radius-sm: 0px;
  --sidebar-w: 310px;
  --topbar-h: 62px;

  --display: "Bricolage Grotesque", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font: "Newsreader", Georgia, "Times New Roman", serif;
  --mono: "JetBrains Mono", "SF Mono", "Fira Code", Menlo, Consolas, monospace;

  /* Syntax highlighting on warm cream */
  --syn-kw: #b8331a;
  --syn-str: #167569;
  --syn-num: #b86209;
  --syn-com: #857458;
  --syn-fn: #1c150d;
  --syn-op: #9e2a2b;
  --syn-var: #1c150d;

  --sec: var(--teal);
  --sec-soft: #dff1ec;

  --scrollbar-thumb: #8b7d64;
  --scrollbar-track: #f1e5d0;

  /* MANDATORY modern-web-guidance: page-wide color-scheme & native UI adaptation */
  color-scheme: light dark;
  accent-color: var(--accent);
  scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track);

  &:has(> head > meta[name="color-scheme"][content="dark"]) {
    color-scheme: dark;
  }
  &:has(> head > meta[name="color-scheme"][content="light"]) {
    color-scheme: light;
  }

  /* Fallback for browsers without light-dark support when no explicit light override is set */
  @media (prefers-color-scheme: dark) {
    &:not([data-theme="light"]) {
      --bg: #140f0a;
      --bg-top: #1d1610;
      --card: #1d1610;
      --cream: #261d15;
      --surface: #1d1610;
      --surface-2: #261d15;
      --surface-3: #33271d;
      --border: #4a3a28;
      --border-strong: #cabd9f;
      --border-ink: #cabd9f;
      --text: #f5ecd7;
      --text-2: #cabd9f;
      --text-3: #9b8a6f;
      --muted: #cabd9f;
      --muted-dim: #8b7d64;
      --line: #4a3a28;
      --line-card: #4a3a28;
      --accent: #32b8a6;
      --accent-soft: #17332f;
      --ok: #68cb54;
      --ok-soft: #1a3017;
      --warn: #f09c3d;
      --warn-soft: #332310;
      --bad: #f06a50;
      --bad-soft: #361914;
      --code-bg: #140f0a;
      --out-bg: #0d0906;
      --out-text: #f5ecd7;
      --syn-kw: #f09c3d;
      --syn-str: #68cb54;
      --syn-num: #f06a50;
      --syn-com: #8b7d64;
      --syn-fn: #46b3a7;
      --syn-op: #f09c3d;
      --syn-var: #f5ecd7;
      --scrollbar-thumb: #6f5f46;
      --scrollbar-track: #140f0a;
    }
  }
}

:root[data-theme="dark"] {
  --bg: #140f0a;
  --bg-top: #1d1610;
  --card: #1d1610;
  --cream: #261d15;
  --surface: #1d1610;
  --surface-2: #261d15;
  --surface-3: #33271d;
  --border: #4a3a28;
  --border-strong: #cabd9f;
  --border-ink: #cabd9f;
  --text: #f5ecd7;
  --text-2: #cabd9f;
  --text-3: #9b8a6f;
  --muted: #cabd9f;
  --muted-dim: #8b7d64;
  --line: #4a3a28;
  --line-card: #4a3a28;
  --accent: #32b8a6;
  --accent-soft: #17332f;
  --ok: #68cb54;
  --ok-soft: #1a3017;
  --warn: #f09c3d;
  --warn-soft: #332310;
  --bad: #f06a50;
  --bad-soft: #361914;
  --code-bg: #140f0a;
  --out-bg: #0d0906;
  --out-text: #f5ecd7;
  --syn-kw: #f09c3d;
  --syn-str: #68cb54;
  --syn-num: #f06a50;
  --syn-com: #8b7d64;
  --syn-fn: #46b3a7;
  --syn-op: #f09c3d;
  --syn-var: #f5ecd7;
  --scrollbar-thumb: #6f5f46;
  --scrollbar-track: #140f0a;
}

@supports not (scrollbar-color: auto) {
  ::-webkit-scrollbar {
    width: 12px;
    height: 12px;
  }
  ::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb);
  }
  ::-webkit-scrollbar-track {
    background: var(--scrollbar-track);
  }
}

* { box-sizing: border-box; }
html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--topbar-h) + 20px);
}
body {
  margin: 0;
  background: radial-gradient(130% 80% at 50% -8%, var(--bg-top) 0, var(--bg) 60%);
  color: var(--text);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.58;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
/* Authentic aidailybrief.ai tactile paper noise overlay */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9000;
  opacity: .06;
  mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
:root[data-theme="dark"] body::before {
  opacity: .04;
  mix-blend-mode: screen;
}
::selection {
  background: var(--amber);
  color: #1c150d;
}
a {
  color: var(--text);
  text-decoration: underline;
  text-decoration-color: var(--amber);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}
a:hover {
  color: var(--red);
  text-decoration-color: var(--red);
}
button {
  font: inherit;
  color: inherit;
  cursor: pointer;
  border-radius: 0;
}
h1, h2, h3, h4 {
  font-family: var(--display);
  font-weight: 800;
  line-height: 1.02;
  letter-spacing: -.03em;
  color: var(--text);
}
:focus-visible {
  outline: 2.5px solid var(--teal);
  outline-offset: 3px;
}

/* ---------- top bar (skybox + masthead rail) ---------- */
.topbar {
  position: fixed;
  inset: 0 0 auto 0;
  height: var(--topbar-h);
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 0 22px;
  background: var(--surface-2);
  border-bottom: 3px solid var(--border-ink);
  box-shadow: 0 4px 0 var(--line);
}
.brand {
  display: flex;
  align-items: center;
  gap: 11px;
  color: var(--text);
  text-decoration: none;
  white-space: nowrap;
}
.brand:hover {
  color: var(--text);
  text-decoration: none;
}
.brand-mark {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  background: var(--amber);
  color: #1c150d;
  font-family: var(--display);
  font-weight: 800;
  font-size: 20px;
  border: 2.5px solid var(--border-ink);
  box-shadow: 3px 3px 0 var(--border-ink);
  transition: transform .14s, box-shadow .14s;
}
.brand:hover .brand-mark {
  transform: translate(-2px, -2px);
  box-shadow: 5px 5px 0 var(--border-ink);
}
.brand-text {
  font-family: var(--display);
  font-weight: 800;
  font-size: 20px;
  letter-spacing: -.03em;
  text-transform: uppercase;
}
.brand-text b {
  font-weight: 800;
  background: var(--amber);
  color: #1c150d;
  padding: 1px 6px;
  border: 2px solid var(--border-ink);
  margin-left: 3px;
}
.icon-btn {
  width: 36px;
  height: 36px;
  border: 2px solid var(--border-ink);
  background: var(--surface);
  display: grid;
  place-items: center;
  color: var(--text);
  box-shadow: 3px 3px 0 var(--border-ink);
  transition: transform .14s, box-shadow .14s, background .14s;
}
.icon-btn:hover {
  background: var(--amber);
  color: #1c150d;
  transform: translate(-2px, -2px);
  box-shadow: 5px 5px 0 var(--border-ink);
}
.menu-btn { display: none; }

.search {
  position: relative;
  flex: 1;
  max-width: 420px;
  margin-left: 16px;
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 0 12px;
  height: 38px;
  background: var(--surface);
  border: 2.5px solid var(--border-ink);
  box-shadow: 3px 3px 0 var(--line);
  color: var(--text-3);
  transition: box-shadow .15s, transform .15s;
}
.search:focus-within {
  box-shadow: 5px 5px 0 var(--teal);
  transform: translate(-1px, -1px);
}
.search input {
  flex: 1;
  border: 0;
  background: transparent;
  outline: 0;
  color: var(--text);
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .04em;
  min-width: 0;
}
.search input::placeholder {
  color: var(--muted-dim);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .1em;
  text-transform: uppercase;
}
.search-results {
  position: absolute;
  top: 44px;
  left: -2.5px;
  right: -2.5px;
  background: var(--surface);
  border: 3px solid var(--border-ink);
  box-shadow: 8px 8px 0 var(--border-ink);
  padding: 6px;
  max-height: 62vh;
  overflow: auto;
  z-index: 80;
}
.search-results a {
  display: block;
  padding: 9px 12px;
  color: var(--text);
  font-family: var(--display);
  font-weight: 700;
  font-size: 15px;
  text-decoration: none;
  border-bottom: 1px dashed var(--line);
}
.search-results a:last-child { border-bottom: 0; }
.search-results a small {
  display: block;
  color: var(--text-3);
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  margin-top: 2px;
}
.search-results a:hover, .search-results a.active {
  background: var(--amber);
  color: #1c150d;
  text-decoration: none;
}
.search-results a:hover small, .search-results a.active small {
  color: #1c150d;
}
.search-results .empty {
  padding: 12px;
  color: var(--text-3);
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  text-transform: uppercase;
}

.topbar-right {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 10px;
}
.r-status {
  display: flex;
  align-items: center;
  gap: 8px;
  height: 36px;
  padding: 0 13px;
  border: 2px solid var(--border-ink);
  background: var(--surface);
  box-shadow: 3px 3px 0 var(--teal);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--text);
  white-space: nowrap;
  transition: transform .14s, box-shadow .14s;
}
.r-status:hover {
  transform: translate(-2px, -2px);
  box-shadow: 5px 5px 0 var(--teal);
}
.r-status .dot {
  width: 9px;
  height: 9px;
  background: var(--muted-dim);
  border: 1.5px solid var(--border-ink);
}
.r-status[data-state="loading"] .dot { background: var(--amber); animation: pulse 1s infinite; }
.r-status[data-state="ready"] .dot { background: var(--green); }
.r-status[data-state="busy"] .dot { background: var(--teal); animation: pulse .7s infinite; }
.r-status[data-state="error"] .dot { background: var(--red); }
@keyframes pulse { 50% { opacity: .35; transform: scale(.8); } }

/* ---------- layout & editorial sidebar ---------- */
.layout {
  display: flex;
  padding-top: var(--topbar-h);
  min-height: 100vh;
}
.sidebar {
  position: fixed;
  top: var(--topbar-h);
  bottom: 0;
  left: 0;
  width: var(--sidebar-w);
  overflow-y: auto;
  padding: 18px 14px 44px;
  background: var(--surface-2);
  border-right: 3px solid var(--border-ink);
}
.main {
  flex: 1;
  margin-left: var(--sidebar-w);
  min-width: 0;
  outline: 0;
}
.boot {
  padding: 90px;
  text-align: center;
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--text-3);
}
.scrim { display: none; }

.side-home {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  color: var(--text);
  font-family: var(--mono);
  font-weight: 700;
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
  text-decoration: none;
  border: 2px solid transparent;
  transition: all .14s;
}
.side-home:hover, .side-home.active {
  background: var(--surface);
  color: var(--text);
  border-color: var(--border-ink);
  box-shadow: 4px 4px 0 var(--amber);
  text-decoration: none;
}
.side-overall {
  margin: 12px 4px 18px;
  padding: 12px 13px;
  background: var(--surface);
  border: 2.5px solid var(--border-ink);
  box-shadow: 4px 4px 0 var(--teal);
}
.side-overall .bar { height: 8px; }
.side-overall small {
  color: var(--text);
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  display: flex;
  justify-content: space-between;
  margin-bottom: 8px;
}

.side-sec { margin-top: 10px; }
.side-sec-head {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 10px;
  border: 2px solid transparent;
  background: transparent;
  text-align: left;
  font-family: var(--display);
  font-weight: 800;
  font-size: 16px;
  letter-spacing: -.02em;
  transition: all .14s;
}
.side-sec-head:hover {
  background: var(--surface);
  border-color: var(--border-ink);
  box-shadow: 3px 3px 0 var(--sec);
}
.side-sec-head .sec-ico {
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  background: var(--sec);
  color: #1c150d;
  border: 2px solid var(--border-ink);
  flex: none;
}
.side-sec-head .sec-ico svg { width: 15px; height: 15px; }
.side-sec-head .t { flex: 1; }
.side-sec-head .count {
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--text-3);
  font-weight: 700;
  letter-spacing: .06em;
}
.side-sec-head .chev {
  color: var(--text);
  transition: transform .15s;
}
.side-sec.open .chev { transform: rotate(90deg); }
.side-lessons {
  display: none;
  margin: 4px 0 10px 22px;
  padding-left: 12px;
  border-left: 2.5px solid var(--border-ink);
}
.side-sec.open .side-lessons { display: block; }
.side-lessons a {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 7px 10px;
  margin: 3px 0;
  color: var(--text-2);
  font-family: var(--font);
  font-size: 14.5px;
  line-height: 1.3;
  text-decoration: none;
  border: 1.5px solid transparent;
  transition: all .12s;
}
.side-lessons a:hover {
  background: var(--surface);
  color: var(--text);
  border-color: var(--border-ink);
  text-decoration: none;
}
.side-lessons a.active {
  background: var(--surface);
  color: var(--text);
  font-weight: 600;
  border: 2px solid var(--border-ink);
  box-shadow: 3px 3px 0 var(--sec);
}
.tick {
  width: 15px;
  height: 15px;
  flex: none;
  border: 2px solid var(--border-ink);
  background: var(--surface);
  display: grid;
  place-items: center;
}
.tick.done {
  background: var(--green);
  border-color: var(--border-ink);
}
.tick.done::after {
  content: "";
  width: 7px;
  height: 4px;
  border-left: 2px solid #1c150d;
  border-bottom: 2px solid #1c150d;
  transform: rotate(-45deg) translateY(-1px);
}
.tick.part {
  border-color: var(--border-ink);
  background: var(--amber);
}

.bar {
  height: 10px;
  background: var(--surface-3);
  border: 2px solid var(--border-ink);
  overflow: hidden;
}
.bar > i {
  display: block;
  height: 100%;
  background: var(--sec);
  transition: width .4s;
}

/* ---------- pages & aidailybrief.ai masthead + ticker ---------- */
.page {
  max-width: 1180px;
  margin: 0 auto;
  padding: 28px 38px 100px;
}

.masthead {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 14px;
  padding: 10px 0 18px;
  text-align: center;
  border-bottom: 1px solid var(--line);
}
.mh-side {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--muted);
  text-transform: uppercase;
  line-height: 1.75;
}
.mh-left { text-align: left; }
.mh-right { text-align: right; }
.mh-side b {
  display: block;
  color: var(--text);
  font-weight: 700;
}
.mh-center {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  min-width: 0;
}
.mh-bot {
  width: 46px;
  height: 52px;
  display: block;
  filter: drop-shadow(3px 3px 0 rgba(28, 21, 13, .22));
}
.mh-word {
  font-family: var(--display);
  font-weight: 800;
  font-size: clamp(32px, 5.5vw, 62px);
  letter-spacing: -.04em;
  line-height: .88;
  color: var(--text);
  margin-top: 2px;
}
.mh-tag {
  font-family: var(--mono);
  font-size: clamp(10px, 1.2vw, 12px);
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--muted);
}
.mh-tag b {
  color: var(--amber);
  font-weight: 700;
}

.ticker {
  overflow: hidden;
  background: #1c150d;
  border: 3px solid var(--border-ink);
  margin: 14px 0 28px;
  box-shadow: 6px 6px 0 var(--amber);
}
.ticker-mask {
  max-width: 100%;
  overflow: hidden;
}
.ticker-track {
  display: inline-flex;
  white-space: nowrap;
  will-change: transform;
  animation: crawl 42s linear infinite;
}
.ticker:hover .ticker-track {
  animation-play-state: paused;
}
@keyframes crawl {
  to { transform: translateX(-50%); }
}
.ticker-track span {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: #f5ecd7;
  padding: 10px 0;
}
.ticker-track .sep {
  color: var(--amber);
  padding: 10px 18px;
}
.ticker-track b {
  color: var(--amber);
  font-weight: 700;
}

/* ---------- hero (broadsheet lead + espresso stats) ---------- */
.kicker {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--teal);
  margin-bottom: 14px;
}
.kicker span {
  color: var(--muted-dim);
}
.hero {
  position: relative;
  overflow: hidden;
  padding: 42px 44px;
  color: var(--text);
  background: var(--surface);
  border: 3px solid var(--border-ink);
  box-shadow: 11px 11px 0 var(--teal);
}
.hero h1 {
  font-family: var(--display);
  font-weight: 800;
  font-size: clamp(34px, 5vw, 60px);
  line-height: .93;
  margin: 0 0 18px;
  letter-spacing: -.035em;
  max-width: 16ch;
}
.hero p {
  font-family: var(--font);
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.48;
  max-width: 54ch;
  margin: 0 0 28px;
  color: var(--text-2);
}
.hero p::first-letter {
  font-family: var(--display);
  font-weight: 800;
  font-size: 2.9em;
  line-height: .82;
  float: left;
  margin: 4px 12px 0 0;
  color: var(--text);
}
.hero .cells {
  position: absolute;
  right: 8px;
  top: 8px;
  width: 350px;
  height: 270px;
  opacity: .95;
  pointer-events: none;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
  clear: both;
}

/* ---------- neo-brutalist buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 42px;
  padding: 0 18px;
  border: 2.5px solid var(--border-ink);
  background: var(--surface);
  color: var(--text);
  font-family: var(--mono);
  font-weight: 700;
  font-size: 12px;
  letter-spacing: .08em;
  text-transform: uppercase;
  text-decoration: none;
  box-shadow: 4px 4px 0 var(--border-ink);
  transition: transform .14s, box-shadow .14s, background .14s, color .14s;
}
.btn:hover {
  text-decoration: none;
  color: #1c150d;
  background: var(--amber);
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 var(--border-ink);
}
.btn:active {
  transform: translate(1px, 1px);
  box-shadow: 2px 2px 0 var(--border-ink);
}
.btn[disabled] {
  opacity: .55;
  cursor: default;
  transform: none !important;
}
.btn.primary {
  background: #1c150d;
  border-color: var(--border-ink);
  color: #f5ecd7;
  box-shadow: 4px 4px 0 var(--teal);
}
.btn.primary:hover {
  background: var(--teal);
  color: #1c150d;
  box-shadow: 6px 6px 0 var(--border-ink);
}
.btn.ok {
  background: var(--green);
  border-color: var(--border-ink);
  color: #1c150d;
  box-shadow: 4px 4px 0 var(--border-ink);
}
.btn.ghost {
  border-color: var(--line);
  background: transparent;
  color: var(--text-2);
  box-shadow: none;
}
.btn.ghost:hover {
  background: var(--surface-2);
  color: var(--text);
  border-color: var(--border-ink);
  box-shadow: 3px 3px 0 var(--border-ink);
}
.btn.sm {
  height: 32px;
  padding: 0 11px;
  font-size: 11px;
  box-shadow: 3px 3px 0 var(--border-ink);
}
.btn.sm.ghost {
  box-shadow: none;
}
.btn.white {
  background: #1c150d;
  color: #f5ecd7;
  border: 3px solid var(--border-ink);
  height: 48px;
  padding: 0 22px;
  font-size: 12.5px;
  box-shadow: 6px 6px 0 var(--teal);
}
.btn.white:hover {
  background: var(--amber);
  color: #1c150d;
  transform: translate(-3px, -3px);
  box-shadow: 9px 9px 0 var(--border-ink);
}
.btn.glass {
  background: var(--surface-2);
  border: 3px solid var(--border-ink);
  color: var(--text);
  height: 48px;
  padding: 0 20px;
  font-size: 12.5px;
  box-shadow: 6px 6px 0 var(--amber);
}
.btn.glass:hover {
  background: var(--surface);
  color: var(--text);
  transform: translate(-3px, -3px);
  box-shadow: 9px 9px 0 var(--amber);
}

/* Espresso stat blocks inside Hero (matching .pg-ed .stats) */
.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 34px;
  padding-top: 26px;
  border-top: 2px dashed var(--line-card);
}
.hero-stats div {
   --stat-c: var(--amber);
  background: var(--panel);
  border: 3px solid var(--stat-c);
  box-shadow: 6px 6px 0 var(--stat-c);
  padding: 16px 16px 13px;
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--on-dark);
  transition: transform .16s, box-shadow .16s;
}
.hero-stats div:nth-child(1) { --stat-c: var(--teal); }
.hero-stats div:nth-child(2) { --stat-c: var(--amber); }
.hero-stats div:nth-child(3) { --stat-c: var(--green); }
.hero-stats div:nth-child(4) { --stat-c: var(--red); }
.hero-stats div:hover {
  transform: translate(-3px, -3px);
  box-shadow: 9px 9px 0 var(--stat-c);
}
.hero-stats b {
  display: block;
  font-family: var(--display);
  font-weight: 800;
  font-size: clamp(28px, 3.8vw, 40px);
  line-height: .95;
  letter-spacing: -.03em;
  color: var(--stat-c);
  margin-bottom: 8px;
}

/* ---------- section headers (.sec-head aesthetic) ---------- */
.h-row {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin: 56px 0 24px;
  flex-wrap: wrap;
}
.h-row::before {
  content: "◆ DISPATCH";
  font-family: var(--mono);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: .18em;
  color: var(--teal);
  text-transform: uppercase;
}
.h-row h2 {
  margin: 0;
  font-family: var(--display);
  font-weight: 800;
  font-size: clamp(26px, 3.6vw, 38px);
  letter-spacing: -.025em;
  line-height: 1;
}
.h-row::after {
  content: "";
  flex: 1 1 40px;
  border-top: 2px solid var(--line);
  transform: translateY(-6px);
  order: 2;
}
.h-row span {
  order: 3;
  color: var(--text);
  font-family: var(--mono);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  border-bottom: 2px solid var(--amber);
  padding-bottom: 2px;
}

/* ---------- section cards (.nug aesthetic) ---------- */
.sec-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 26px;
}
.sec-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 24px 24px 16px;
  background: var(--surface);
  border: 3px solid var(--border-ink);
  color: var(--text);
  box-shadow: 9px 9px 0 var(--sec);
  text-decoration: none;
  transition: transform .18s cubic-bezier(.2, .7, .2, 1), box-shadow .18s cubic-bezier(.2, .7, .2, 1);
}
.sec-card:hover {
  transform: translate(-4px, -4px);
  box-shadow: 13px 13px 0 var(--sec);
  color: var(--text);
  text-decoration: none;
}
.sec-card .top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
}
.sec-card .sec-ico {
  order: 2;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  background: var(--sec);
  color: #1c150d;
  border: 2.5px solid var(--border-ink);
  box-shadow: 3px 3px 0 var(--border-ink);
  flex: none;
}
.sec-card .sec-ico svg { width: 22px; height: 22px; }
.sec-card .num {
  display: inline-block;
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: .16em;
  text-transform: uppercase;
  background: var(--sec);
  color: #1c150d;
  padding: 4px 9px;
  border: 2px solid var(--border-ink);
  margin-bottom: 10px;
}
.sec-card h3 {
  margin: 0;
  font-family: var(--display);
  font-weight: 800;
  font-size: 25px;
  line-height: 1.05;
  letter-spacing: -.022em;
}
.sec-card:hover h3 {
  text-decoration: underline;
  text-decoration-color: var(--sec);
  text-decoration-thickness: 2.5px;
  text-underline-offset: 3px;
}
.sec-card p {
  margin: 2px 0 6px;
  color: var(--text-2);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.5;
  flex: 1;
}
.sec-card .meta {
  display: flex;
  justify-content: space-between;
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-top: 8px;
  padding-top: 12px;
  border-top: 1.5px dashed var(--line-card);
}

/* ---------- how it works grid ---------- */
.how {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.how div {
  --how-c: var(--teal);
  padding: 22px 20px 18px;
  background: var(--surface);
  border: 3px solid var(--border-ink);
  box-shadow: 7px 7px 0 var(--how-c);
  transition: transform .16s, box-shadow .16s;
}
.how div:nth-child(1) { --how-c: var(--teal); }
.how div:nth-child(2) { --how-c: var(--amber); }
.how div:nth-child(3) { --how-c: var(--green); }
.how div:nth-child(4) { --how-c: var(--red); }
.how div:hover {
  transform: translate(-3px, -3px);
  box-shadow: 10px 10px 0 var(--how-c);
}
.how .n {
  width: 34px;
  height: 30px;
  background: var(--how-c);
  color: #1c150d;
  border: 2px solid var(--border-ink);
  display: grid;
  place-items: center;
  font-family: var(--mono);
  font-weight: 700;
  font-size: 12px;
  letter-spacing: .08em;
  margin-bottom: 14px;
}
.how b {
  display: block;
  font-family: var(--display);
  font-weight: 800;
  font-size: 21px;
  letter-spacing: -.02em;
  margin-bottom: 8px;
}
.how p {
  margin: 0;
  color: var(--text-2);
  font-family: var(--font);
  font-size: 15.5px;
  line-height: 1.48;
}

/* ---------- section page ---------- */
.sec-hero {
  display: flex;
  gap: 24px;
  align-items: center;
  padding: 32px 34px;
  background: var(--surface);
  border: 3px solid var(--border-ink);
  box-shadow: 10px 10px 0 var(--sec);
}
.sec-hero .sec-ico {
  width: 68px;
  height: 68px;
  display: grid;
  place-items: center;
  background: var(--sec);
  color: #1c150d;
  border: 3px solid var(--border-ink);
  box-shadow: 5px 5px 0 var(--border-ink);
  flex: none;
}
.sec-hero .sec-ico svg { width: 34px; height: 34px; }
.sec-hero h1 {
  margin: 6px 0 8px;
  font-size: clamp(30px, 4vw, 44px);
}
.sec-hero p {
  margin: 0;
  color: var(--text-2);
  font-style: italic;
  font-size: 18px;
  max-width: 65ch;
}
.sec-hero .bar {
  margin-top: 16px;
  max-width: 380px;
}

.lesson-list {
  margin-top: 30px;
  display: grid;
  gap: 14px;
}
.lesson-row {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 18px 22px;
  background: var(--surface);
  border: 2.5px solid var(--border-ink);
  box-shadow: 6px 6px 0 var(--line);
  color: var(--text);
  text-decoration: none;
  transition: transform .15s, box-shadow .15s;
}
.lesson-row:hover {
  text-decoration: none;
  color: var(--text);
  transform: translate(-3px, -3px);
  box-shadow: 9px 9px 0 var(--sec);
}
.lesson-row .idx {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  background: var(--sec);
  color: #1c150d;
  border: 2px solid var(--border-ink);
  font-family: var(--mono);
  font-weight: 700;
  flex: none;
  font-size: 13px;
}
.lesson-row.done .idx {
  background: var(--green);
  color: #1c150d;
}
.lesson-row .body {
  flex: 1;
  min-width: 0;
}
.lesson-row .body b {
  display: block;
  font-family: var(--display);
  font-weight: 800;
  font-size: 19px;
  letter-spacing: -.02em;
  line-height: 1.15;
  margin-bottom: 3px;
}
.lesson-row:hover .body b {
  text-decoration: underline;
  text-decoration-color: var(--sec);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}
.lesson-row .body span {
  color: var(--text-2);
  font-family: var(--font);
  font-size: 15.5px;
}
.lesson-row .tags {
  display: flex;
  gap: 8px;
  flex: none;
}

.chip {
  display: inline-flex;
  align-items: center;
  height: 26px;
  padding: 0 10px;
  background: var(--surface-2);
  color: var(--text);
  border: 1.5px solid var(--border-ink);
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  white-space: nowrap;
}
.chip.lvl-beginner { background: var(--green); color: #1c150d; }
.chip.lvl-intermediate { background: var(--amber); color: #1c150d; }
.chip.lvl-advanced { background: var(--red); color: #1c150d; }
.chip.live { background: var(--teal); color: #1c150d; }

/* ---------- lesson view ---------- */
.lesson-wrap {
  display: grid;
  grid-template-columns: minmax(0, 780px) 230px;
  gap: 48px;
  justify-content: center;
  max-width: 1160px;
  margin: 0 auto;
  padding: 32px 40px 120px;
}
.crumbs {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--text-3);
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
}
.crumbs a {
  color: var(--teal);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 1.5px solid var(--teal);
}
.crumbs a:hover {
  color: var(--red);
  border-color: var(--red);
}
.lesson-head h1 {
  font-family: var(--display);
  font-weight: 800;
  font-size: clamp(32px, 4.2vw, 50px);
  line-height: .94;
  margin: 12px 0 14px;
  letter-spacing: -.035em;
}
.lesson-head .lead {
  font-family: var(--font);
  font-style: italic;
  font-size: 20px;
  color: var(--text-2);
  margin: 0 0 18px;
  line-height: 1.45;
}
.lesson-meta {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  padding-bottom: 22px;
  border-bottom: 4px solid var(--border-ink);
  box-shadow: 0 6px 0 -4px var(--bg), 0 7px 0 0 var(--line);
  margin-bottom: 16px;
}

.toc {
  position: sticky;
  top: calc(var(--topbar-h) + 30px);
  align-self: start;
  max-height: calc(100vh - 120px);
  overflow: auto;
}
.toc h4 {
  margin: 0 0 12px;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--teal);
}
.toc a {
  display: block;
  padding: 6px 0 6px 12px;
  color: var(--text-2);
  border-left: 2.5px solid var(--line);
  font-family: var(--font);
  font-size: 14px;
  line-height: 1.35;
  text-decoration: none;
}
.toc a:hover {
  color: var(--text);
  border-left-color: var(--border-ink);
  text-decoration: none;
}
.toc a.active {
  color: var(--text);
  border-left: 3px solid var(--sec);
  background: var(--surface);
  padding-left: 11px;
  font-weight: 600;
}
.toc .prog {
  margin-top: 20px;
  padding: 14px;
  background: var(--surface);
  border: 2.5px solid var(--border-ink);
  box-shadow: 5px 5px 0 var(--sec);
}
.toc .prog small {
  color: var(--text);
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  display: block;
  margin-bottom: 8px;
}

/* ---------- editorial prose ---------- */
.prose {
  font-family: var(--font);
  font-size: 17.5px;
  line-height: 1.62;
  color: var(--text);
}
.prose h2 {
  font-family: var(--display);
  font-weight: 800;
  font-size: clamp(24px, 3vw, 31px);
  margin: 48px 0 14px;
  padding-top: 10px;
  border-top: 2px solid var(--line);
  letter-spacing: -.025em;
}
.prose h3 {
  font-family: var(--display);
  font-weight: 800;
  font-size: 21px;
  margin: 32px 0 10px;
  letter-spacing: -.02em;
}
.prose p { margin: 14px 0; }
.prose ul, .prose ol { padding-left: 24px; margin: 14px 0; }
.prose li { margin: 6px 0; }
.prose li::marker {
  color: var(--sec);
  font-family: var(--mono);
  font-weight: 700;
}
.prose strong { font-weight: 700; color: var(--text); }
.prose img {
  max-width: 100%;
  border: 2.5px solid var(--border-ink);
  box-shadow: 6px 6px 0 var(--line);
}
.prose hr {
  border: 0;
  border-top: 3px solid var(--border-ink);
  margin: 40px 0;
}
.prose :not(pre) > code {
  font-family: var(--mono);
  font-size: .82em;
  font-weight: 500;
  padding: 2px 6px;
  background: var(--surface-2);
  border: 1.5px solid var(--line);
  color: var(--syn-kw);
}
.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 22px 0;
  font-size: 15px;
  display: block;
  overflow-x: auto;
}
.prose th {
  text-align: left;
  background: var(--surface-2);
  font-family: var(--mono);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.prose th, .prose td {
  padding: 10px 13px;
  border: 2px solid var(--border-ink);
  vertical-align: top;
}
.prose td {
  background: var(--surface);
}
.prose blockquote {
  margin: 20px 0;
  padding: 8px 20px;
  border-left: 4px solid var(--amber);
  background: var(--surface-2);
  font-style: italic;
  color: var(--text-2);
}

/* ---------- callouts (.nug & .thesis inspired) ---------- */
.callout {
  margin: 24px 0;
  padding: 18px 20px 16px 54px;
  position: relative;
  background: var(--surface);
  border: 2.5px solid var(--border-ink);
  box-shadow: 6px 6px 0 var(--teal);
  font-size: 16px;
}
.callout::before {
  content: "i";
  position: absolute;
  left: 16px;
  top: 18px;
  width: 24px;
  height: 24px;
  display: grid;
  place-items: center;
  background: var(--teal);
  color: #1c150d;
  border: 2px solid var(--border-ink);
  font-family: var(--mono);
  font-weight: 700;
  font-size: 13px;
}
.callout > :first-child { margin-top: 0; }
.callout > :last-child { margin-bottom: 0; }
.callout .c-title {
  display: block;
  font-family: var(--mono);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  margin-bottom: 6px;
  color: var(--text);
}
.callout.tip {
  box-shadow: 6px 6px 0 var(--green);
}
.callout.tip::before {
  content: "✓";
  background: var(--green);
}
.callout.warning {
  background: var(--warn-soft);
  box-shadow: 6px 6px 0 var(--amber);
}
.callout.warning::before {
  content: "!";
  background: var(--amber);
}
/* Key takeaways styled like aidailybrief.ai .nug.take dark espresso card */
.callout.key {
  background: var(--panel);
  color: var(--on-dark);
  border: 3px solid var(--border-ink);
  box-shadow: 9px 9px 0 var(--amber);
  padding-left: 24px;
}
.callout.key .c-title {
  display: inline-block;
  background: var(--amber);
  color: #1c150d;
  padding: 3px 9px;
  border: 2px solid #1c150d;
  margin-bottom: 10px;
}
.callout.key strong { color: #f5ecd7; }
.callout.key :not(pre) > code {
  background: #2b2118;
  border-color: #4a3a28;
  color: var(--amber);
}
.callout.key::before { display: none; }
.callout.bio {
  box-shadow: 6px 6px 0 var(--teal);
}
.callout.bio::before {
  content: "🧬";
  background: var(--surface-2);
  font-size: 14px;
}
.callout.source {
  background: var(--surface-2);
  box-shadow: 6px 6px 0 var(--line);
}
.callout.source::before {
  content: "↗";
  background: var(--amber);
}

/* ---------- static code & dark output blocks ---------- */
.code {
  position: relative;
  margin: 18px 0;
  background: var(--code-bg);
  border: 2.5px solid var(--border-ink);
  box-shadow: 5px 5px 0 var(--line);
  overflow: hidden;
}
.code pre {
  margin: 0;
  padding: 14px 16px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 13.5px;
  line-height: 1.6;
}
.code .copy {
  position: absolute;
  top: 8px;
  right: 8px;
  opacity: 0;
  transition: opacity .15s;
}
.code:hover .copy, .code .copy:focus-visible { opacity: 1; }
/* MANDATORY component-specific-light-dark-theme: re-specify inherited color & accent-color on dark subtrees */
.code.out, .output {
  color-scheme: dark;
  background: var(--out-bg);
  color: var(--out-text);
  accent-color: var(--teal);
}
.code.out {
  border-color: var(--border-ink);
  box-shadow: 5px 5px 0 var(--border-ink);
}
.code.out pre { color: var(--out-text); }
.code-label {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--text);
  border-bottom: 2px solid var(--border-ink);
  background: var(--surface);
}
.code-label .where {
  margin-left: auto;
  color: var(--text-3);
}

.cm-keyword { color: var(--syn-kw) !important; font-weight: 700; }
.cm-string { color: var(--syn-str) !important; }
.cm-number, .cm-atom { color: var(--syn-num) !important; font-weight: 600; }
.cm-comment { color: var(--syn-com) !important; font-style: italic; }
.cm-builtin { color: var(--syn-fn) !important; font-weight: 600; }
.cm-operator, .cm-arrow, .cm-dollar { color: var(--syn-op) !important; font-weight: 700; }
.cm-variable, .cm-variable-2, .cm-variable-3 { color: var(--syn-var) !important; }
.cm-error { color: inherit !important; }

/* ---------- runnable R cells ---------- */
.cell {
  margin: 22px 0;
  border: 3px solid var(--border-ink);
  background: var(--surface);
  overflow: hidden;
  box-shadow: 8px 8px 0 var(--green);
  transition: box-shadow .15s;
}
.cell:focus-within {
  box-shadow: 10px 10px 0 var(--teal);
}
.cell-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 10px 7px 14px;
  background: var(--surface-2);
  border-bottom: 2.5px solid var(--border-ink);
}
.cell-bar .lbl {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  color: #1c150d;
  background: var(--green);
  border: 2px solid var(--border-ink);
  padding: 3px 9px;
  letter-spacing: .14em;
  text-transform: uppercase;
  display: flex;
  gap: 7px;
  align-items: center;
}
.cell-bar .lbl i {
  width: 7px;
  height: 7px;
  background: #1c150d;
  display: inline-block;
}
.cell-bar .sp { flex: 1; }
.cell-bar kbd {
  font: 10.5px var(--mono);
  font-weight: 700;
  color: var(--text-3);
  padding: 3px 7px;
  border: 1.5px solid var(--line);
  background: var(--surface);
}
.CodeMirror {
  height: auto;
  font-family: var(--mono);
  font-size: 13.5px;
  line-height: 1.6;
  background: var(--surface);
  color: var(--text);
}
.CodeMirror-scroll { min-height: 46px; }
.CodeMirror-lines { padding: 12px 0; }
.CodeMirror pre.CodeMirror-line, .CodeMirror pre.CodeMirror-line-like { padding: 0 14px; }
.CodeMirror-gutters {
  background: var(--surface-2);
  border-right: 1.5px solid var(--line);
}
.CodeMirror-linenumber {
  color: var(--muted-dim);
  font-family: var(--mono);
  font-size: 11.5px;
}
.CodeMirror-cursor { border-left: 2px solid var(--text); }
.CodeMirror-selected, .CodeMirror-focused .CodeMirror-selected {
  background: color-mix(in srgb, var(--amber) 32%, transparent) !important;
}
.output {
  border-top: 2.5px solid var(--border-ink);
  padding: 14px 16px;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.55;
  max-height: 520px;
  overflow: auto;
}
.output:empty { display: none; }
.output pre {
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
  font: inherit;
}
.output .err { color: #ff8a75; }
.output .msg { color: #f5b963; }
.output .muted { color: #9b8a6f; font-style: italic; }
.output canvas {
  display: block;
  max-width: 100%;
  width: 560px;
  height: auto;
  background: #fffdf7;
  border: 2px solid #cabd9f;
  margin: 10px 0;
}
.spinner {
  display: inline-block;
  width: 13px;
  height: 13px;
  border: 2px solid var(--amber);
  border-right-color: transparent;
  border-radius: 50%;
  animation: spin .7s linear infinite;
  vertical-align: -2px;
  margin-right: 8px;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- exercises ---------- */
.exercise {
  margin: 32px 0;
  border: 3px solid var(--border-ink);
  background: var(--surface);
  box-shadow: 10px 10px 0 var(--sec);
  overflow: hidden;
}
.exercise.passed {
  box-shadow: 10px 10px 0 var(--green);
}
.ex-head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  background: var(--surface-2);
  border-bottom: 2.5px solid var(--border-ink);
}
.ex-badge {
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: #1c150d;
  background: var(--sec);
  border: 2px solid var(--border-ink);
  padding: 4px 10px;
  white-space: nowrap;
}
.ex-head h4 {
  margin: 0;
  font-family: var(--display);
  font-weight: 800;
  font-size: 19px;
  letter-spacing: -.02em;
  flex: 1;
}
.ex-state {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  background: var(--green);
  color: #1c150d;
  border: 2px solid var(--border-ink);
  padding: 3px 9px;
  display: none;
  align-items: center;
  gap: 6px;
}
.exercise.passed .ex-state { display: flex; }
.ex-prompt {
  padding: 14px 18px 6px;
  font-size: 16.5px;
}
.ex-prompt p { margin: 8px 0; }
.ex-editor {
  border-top: 2.5px solid var(--border-ink);
  border-bottom: 2.5px solid var(--border-ink);
  margin-top: 10px;
}
.ex-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 12px 14px;
  align-items: center;
  background: var(--surface-2);
}
.ex-actions .sp { flex: 1; }
.ex-feedback {
  margin: 12px 14px 14px;
  padding: 12px 16px;
  border: 2px solid var(--border-ink);
  font-size: 15px;
  display: none;
}
.ex-feedback.show { display: block; }
.ex-feedback.good {
  background: var(--ok-soft);
  color: var(--text);
  box-shadow: 4px 4px 0 var(--green);
  font-weight: 600;
}
.ex-feedback.bad {
  background: var(--bad-soft);
  color: var(--text);
  box-shadow: 4px 4px 0 var(--red);
}
.ex-feedback.hint {
  background: var(--warn-soft);
  color: var(--text);
  box-shadow: 4px 4px 0 var(--amber);
}
.ex-feedback.hint b {
  font-family: var(--mono);
  font-size: 11.5px;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--warn);
}
.ex-feedback p { margin: 4px 0; }
.exercise .output { border-top: 2.5px solid var(--border-ink); }
.ex-local {
  padding: 0 18px 6px;
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--text-3);
}
.ex-solution { margin: 12px 14px 14px; }
.ex-solution .code { margin: 0 0 10px; }
.ex-expected {
  padding: 12px 16px;
  border: 2px solid var(--border-ink);
  background: var(--ok-soft);
  font-size: 15px;
}
.ex-expected p { margin: 4px 0; display: inline; }

/* ---------- quizzes ---------- */
.quiz {
  margin: 32px 0;
  padding: 22px 24px;
  background: var(--surface);
  border: 3px solid var(--border-ink);
  box-shadow: 9px 9px 0 var(--amber);
}
.quiz .q-badge {
  display: inline-block;
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: .16em;
  text-transform: uppercase;
  background: var(--amber);
  color: #1c150d;
  border: 2px solid var(--border-ink);
  padding: 4px 10px;
}
.quiz .q-text {
  font-family: var(--display);
  font-weight: 800;
  font-size: 20px;
  letter-spacing: -.02em;
  line-height: 1.18;
  margin: 12px 0 16px;
}
.quiz .q-text p { margin: 0; }
.quiz .opts { display: grid; gap: 10px; }
.quiz .opt {
  text-align: left;
  padding: 12px 15px;
  border: 2px solid var(--border-ink);
  background: var(--surface);
  font-family: var(--font);
  font-size: 16px;
  display: flex;
  gap: 12px;
  align-items: baseline;
  box-shadow: 3px 3px 0 var(--line);
  transition: transform .12s, box-shadow .12s, background .12s;
}
.quiz .opt:hover:not([disabled]) {
  background: var(--surface-2);
  transform: translate(-2px, -2px);
  box-shadow: 5px 5px 0 var(--amber);
}
.quiz .opt .k {
  font-family: var(--mono);
  font-weight: 700;
  color: #1c150d;
  background: var(--surface-2);
  border: 1.5px solid var(--border-ink);
  padding: 1px 6px;
  font-size: 11.5px;
}
.quiz .opt p { margin: 0; display: inline; }
.quiz .opt.right {
  border-color: var(--border-ink);
  background: var(--ok-soft);
  box-shadow: 4px 4px 0 var(--green);
}
.quiz .opt.right .k { background: var(--green); }
.quiz .opt.wrong {
  border-color: var(--border-ink);
  background: var(--bad-soft);
  box-shadow: 4px 4px 0 var(--red);
}
.quiz .opt.wrong .k { background: var(--red); }
.quiz .opt[disabled] { cursor: default; }
.quiz .q-exp {
  margin-top: 14px;
  padding: 13px 16px;
  border: 2px dashed var(--border-ink);
  background: var(--surface-2);
  font-size: 15.5px;
  display: none;
}
.quiz.answered .q-exp { display: block; }
.quiz .q-exp p { margin: 0; }

/* ---------- lesson footer ---------- */
.lesson-foot {
  margin-top: 60px;
  padding-top: 32px;
  border-top: 4px solid var(--border-ink);
  position: relative;
}
.lesson-foot::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 4px;
  border-top: 1px solid var(--line);
}
.complete-box {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 22px 24px;
  background: var(--panel);
  color: #f5ecd7;
  border: 3px solid var(--border-ink);
  box-shadow: 9px 9px 0 var(--amber);
  flex-wrap: wrap;
}
.complete-box .txt { flex: 1; min-width: 220px; }
.complete-box b {
  display: block;
  font-family: var(--display);
  font-weight: 800;
  font-size: 22px;
  letter-spacing: -.02em;
  color: #f5ecd7;
  margin-bottom: 4px;
}
.complete-box span {
  color: var(--on-dark);
  font-family: var(--font);
  font-size: 15.5px;
}
.complete-box .btn.primary {
  background: var(--amber);
  color: #1c150d;
  border-color: #f5ecd7;
  box-shadow: 4px 4px 0 #f5ecd7;
}
.complete-box .btn.ok {
  background: var(--green);
  color: #1c150d;
  border-color: #f5ecd7;
  box-shadow: 4px 4px 0 #f5ecd7;
}

.pn {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  margin-top: 24px;
}
.pn a {
  padding: 18px 20px;
  border: 2.5px solid var(--border-ink);
  background: var(--surface);
  color: var(--text);
  font-family: var(--display);
  font-weight: 800;
  font-size: 18px;
  letter-spacing: -.02em;
  text-decoration: none;
  box-shadow: 6px 6px 0 var(--line);
  transition: transform .15s, box-shadow .15s;
}
.pn a:hover {
  transform: translate(-3px, -3px);
  box-shadow: 9px 9px 0 var(--sec);
  text-decoration: none;
  color: var(--text);
}
.pn a small {
  display: block;
  color: var(--teal);
  font-family: var(--mono);
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: .14em;
  font-weight: 700;
  margin-bottom: 4px;
}
.pn a.next { text-align: right; }
.pn .ghost-cell { visibility: hidden; }

.local-banner {
  margin: 20px 0;
  padding: 14px 18px;
  background: var(--warn-soft);
  border: 2.5px solid var(--border-ink);
  box-shadow: 5px 5px 0 var(--amber);
  font-size: 15.5px;
}
.toast {
  position: fixed;
  bottom: 26px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: #1c150d;
  color: #f5ecd7;
  padding: 11px 20px;
  border: 2.5px solid #f5ecd7;
  box-shadow: 6px 6px 0 var(--amber);
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  opacity: 0;
  transition: all .22s;
  z-index: 100;
  pointer-events: none;
}
.toast.show {
  opacity: 1;
  transform: translateX(-50%);
}

/* ---------- Forced Colors Mode support (modern-web-guidance: color) ---------- */
@media (forced-colors: active) {
  .sec-card, .hero, .cell, .exercise, .quiz, .callout, .btn, .lesson-row, .side-overall {
    border: 2px solid CanvasText;
  }
}

/* ---------- responsive ---------- */
@media (max-width: 1180px) {
  .lesson-wrap { grid-template-columns: minmax(0, 780px); }
  .toc { display: none; }
}
@media (max-width: 900px) {
  .menu-btn { display: grid; }
  .sidebar {
    transform: translateX(-104%);
    transition: transform .22s;
    z-index: 60;
    box-shadow: 8px 0 0 var(--border-ink);
  }
  body.nav-open .sidebar { transform: none; }
  body.nav-open .scrim {
    display: block;
    position: fixed;
    inset: var(--topbar-h) 0 0 0;
    background: rgba(28, 21, 13, .55);
    z-index: 55;
  }
  .main { margin-left: 0; }
  .page, .lesson-wrap { padding-left: 18px; padding-right: 18px; }
  .masthead { grid-template-columns: 1fr; }
  .mh-side { display: none; }
  .sec-grid { grid-template-columns: 1fr; }
  .how { grid-template-columns: 1fr 1fr; }
  .hero { padding: 28px 22px; }
  .hero .cells { display: none; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .brand-text { display: none; }
  .r-status .label { display: none; }
  .search { margin-left: 0; }
  .lesson-row .tags { display: none; }
  .pn { grid-template-columns: 1fr; }
}
@media (max-width: 540px) {
  .how, .hero-stats { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}
@media print {
  .topbar, .sidebar, .toc, .ex-actions, .lesson-foot, .ticker { display: none !important; }
  body::before { display: none !important; }
  .main { margin: 0; }
  .layout { padding: 0; }
}