/* ============================================================================
   AIdactic design system — "premium learning publication"
   Warm paper & ink · Playfair Display headlines · IBM Plex Mono labels ·
   amber signature accent · deep pine second voice.
   Tokens are the single source of truth (the player inherits them, so the
   semantic names + legacy --indigo/--violet aliases are kept intact).
   ========================================================================== */
@import url("/static/fonts.css");

:root {
  /* ── Brand palette ── */
  --paper-0:   #f4eede;   /* page */
  --paper-1:   #fbf7ee;   /* raised card */
  --paper-2:   #efe7d5;   /* sunken / subtle fill */
  --ink-0:     #211a12;   /* primary text */
  --ink-1:     #4d4336;   /* secondary */
  --ink-2:     #857a68;   /* muted / captions */
  --line-0:    #e2d7c0;   /* hairline */
  --line-1:    #d3c5a8;   /* stronger rule */

  --amber:      #c07c14;  /* signature accent */
  --amber-deep: #9a6209;
  --amber-soft: #f3e6c8;
  --pine:       #1f4d3f;  /* second voice (links, depth) */
  --pine-soft:  #d9e6df;

  /* ── Semantic tokens (used across templates + player) ── */
  --bg: var(--paper-0);
  --bg-tint:
    radial-gradient(60rem 30rem at 82% -8%, rgba(192,124,20,0.10), transparent 60%),
    radial-gradient(48rem 28rem at 4% 8%, rgba(31,77,63,0.06), transparent 55%);
  --card: var(--paper-1);
  --surface-2: var(--paper-2);
  --ink: var(--ink-0);
  --muted: var(--ink-2);
  --line: var(--line-0);
  --input-bg: #fffdf7;
  --brand: var(--amber-deep);
  --brand-ink: #fffdf7;
  --accent: var(--amber);
  --link: var(--pine);
  --ok:  #2f6b46;  --ok-bg:  #e0efe2;
  --err: #a33122;  --err-bg: #f6e0da;

  /* legacy aliases so the player's raw color refs stay valid */
  --indigo: var(--amber-deep);
  --violet: var(--amber);
  --amber-soft-legacy: var(--amber-soft);

  /* ── Type ── */
  --font-display: "Playfair Display", Georgia, "Times New Roman", serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --step--1: clamp(0.80rem, 0.77rem + 0.12vw, 0.86rem);
  --step-0:  clamp(1.00rem, 0.96rem + 0.18vw, 1.10rem);
  --step-1:  clamp(1.20rem, 1.12rem + 0.40vw, 1.45rem);
  --step-2:  clamp(1.55rem, 1.40rem + 0.75vw, 2.10rem);
  --step-3:  clamp(2.10rem, 1.80rem + 1.50vw, 3.20rem);
  --step-4:  clamp(2.80rem, 2.20rem + 3.00vw, 5.00rem);
  --step-5:  clamp(3.40rem, 2.40rem + 5.00vw, 6.80rem);

  /* ── Depth (warm-tinted) ── */
  --shadow-sm: 0 1px 2px rgba(52,38,16,0.06), 0 2px 4px rgba(52,38,16,0.04);
  --shadow-md: 0 4px 10px rgba(52,38,16,0.07), 0 12px 28px rgba(52,38,16,0.06);
  --shadow-lg: 0 8px 18px rgba(52,38,16,0.08), 0 30px 60px rgba(52,38,16,0.12);

  --radius: 14px;  --radius-sm: 10px;  --radius-xs: 6px;  --radius-lg: 26px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --maxw: 1120px;
  color-scheme: light;
}

/* Dark — follows OS preference unless the user has explicitly chosen light. */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --paper-0: #161009;  --paper-1: #211a0f;  --paper-2: #2a2114;
    --ink-0: #f3ead6;    --ink-1: #cdbfa3;    --ink-2: #9c8e76;
    --line-0: #342817;   --line-1: #45371f;
    --amber: #e3a83d;    --amber-deep: #d2912a;  --amber-soft: rgba(227,168,61,0.16);
    --pine: #74b39c;     --pine-soft: rgba(116,179,156,0.16);
    --input-bg: #181107;
    --brand: var(--amber);  --brand-ink: #1a1206;  --accent: var(--amber);  --link: var(--pine);
    --ok: #6fc18d;  --ok-bg: rgba(47,107,70,0.24);
    --err: #e8927f; --err-bg: rgba(163,49,34,0.26);
    --bg-tint:
      radial-gradient(60rem 30rem at 82% -8%, rgba(227,168,61,0.14), transparent 60%),
      radial-gradient(48rem 28rem at 4% 8%, rgba(116,179,156,0.08), transparent 55%);
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.5);
    --shadow-md: 0 6px 22px rgba(0,0,0,0.5);
    --shadow-lg: 0 30px 60px rgba(0,0,0,0.6);
  }
}
/* Dark — explicit toggle (wins over OS preference). */
:root[data-theme="dark"] {
  --paper-0: #161009;  --paper-1: #211a0f;  --paper-2: #2a2114;
  --ink-0: #f3ead6;    --ink-1: #cdbfa3;    --ink-2: #9c8e76;
  --line-0: #342817;   --line-1: #45371f;
  --amber: #e3a83d;    --amber-deep: #d2912a;  --amber-soft: rgba(227,168,61,0.16);
  --pine: #74b39c;     --pine-soft: rgba(116,179,156,0.16);
  --input-bg: #181107;
  --brand: var(--amber);  --brand-ink: #1a1206;  --accent: var(--amber);  --link: var(--pine);
  --ok: #6fc18d;  --ok-bg: rgba(47,107,70,0.24);
  --err: #e8927f; --err-bg: rgba(163,49,34,0.26);
  --bg-tint:
    radial-gradient(60rem 30rem at 82% -8%, rgba(227,168,61,0.14), transparent 60%),
    radial-gradient(48rem 28rem at 4% 8%, rgba(116,179,156,0.08), transparent 55%);
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.5);
  --shadow-md: 0 6px 22px rgba(0,0,0,0.5);
  --shadow-lg: 0 30px 60px rgba(0,0,0,0.6);
}

/* ── Reset / base ── */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; min-height: 100vh; display: flex; flex-direction: column;
  font-family: var(--font-body); font-size: var(--step-0); line-height: 1.65;
  color: var(--ink); background-color: var(--bg);
  background-image:
    var(--bg-tint),
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%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)' opacity='0.035'/%3E%3C/svg%3E");
  background-attachment: fixed, fixed, fixed;
  -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility;
}
h1, h2, h3 { font-family: var(--font-display); font-weight: 700; line-height: 1.08;
  letter-spacing: -0.015em; color: var(--ink); margin: 0 0 0.5em; }
p { margin: 0 0 1rem; }
a { color: var(--link); text-decoration: none; text-underline-offset: 3px; }
a:hover { text-decoration: underline; }
img { max-width: 100%; display: block; }
::selection { background: var(--amber-soft); color: var(--ink); }
:focus-visible { outline: 2.5px solid var(--amber); outline-offset: 3px; border-radius: 3px; }

@view-transition { navigation: auto; }
.skip-link { position: absolute; left: -9999px; top: 8px; z-index: 100; background: var(--ink); color: var(--paper-0);
  padding: 10px 16px; border-radius: var(--radius-sm); font-size: 0.9rem; }
.skip-link:focus { left: 12px; }
.preview-ribbon { position: sticky; top: 0; z-index: 60; text-align: center;
  font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.1em; text-transform: uppercase;
  background: var(--amber); color: #2a1c05; padding: 7px 12px; font-weight: 700; }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 clamp(18px, 5vw, 44px); }
.eyebrow { font-family: var(--font-mono); font-weight: 700; font-size: var(--step--1);
  letter-spacing: 0.22em; text-transform: uppercase; color: var(--amber-deep); margin: 0 0 14px; }
.muted { color: var(--muted); }
.lede { font-size: var(--step-1); line-height: 1.5; color: var(--ink-1); }

/* ── Top bar ── */
.topbar { position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 14px clamp(18px, 5vw, 44px);
  background: color-mix(in srgb, var(--paper-0) 82%, transparent);
  backdrop-filter: saturate(1.4) blur(12px);
  border-bottom: 1px solid color-mix(in srgb, var(--line) 70%, transparent); }
.brand { display: inline-flex; align-items: baseline; gap: 1px;
  font-family: var(--font-display); font-weight: 800; font-size: 1.42rem;
  letter-spacing: -0.02em; color: var(--ink); }
.brand:hover { text-decoration: none; }
.brand .mark { color: var(--amber-deep); }
.brand .dot { color: var(--amber); }
.topbar nav { display: flex; align-items: center; gap: clamp(10px, 2vw, 26px); }
.nav-link { font-family: var(--font-mono); font-size: 0.78rem; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--ink-1); font-weight: 500; }
.nav-link:hover { color: var(--amber-deep); text-decoration: none; }
.nav-link-btn { background: none; border: 0; cursor: pointer; font: inherit;
  font-family: var(--font-mono); text-transform: uppercase; letter-spacing: 0.08em;
  font-size: 0.78rem; color: var(--ink-1); padding: 0; }
.theme-toggle { background: var(--surface-2); border: 1px solid var(--line); color: var(--ink);
  border-radius: 999px; width: 34px; height: 34px; cursor: pointer; font-size: 0.95rem;
  display: inline-grid; place-items: center; transition: border-color .2s, transform .2s; }
.theme-toggle:hover { border-color: var(--amber); transform: rotate(-18deg); }

/* ── Buttons ── */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 26px; border-radius: 999px; font-weight: 600; font-size: 0.96rem;
  border: 1px solid transparent; cursor: pointer; font-family: var(--font-body);
  transition: transform .25s var(--ease), box-shadow .25s var(--ease), background .2s, border-color .2s; }
.btn:hover { text-decoration: none; transform: translateY(-2px); }
.btn-primary { background: var(--amber); color: #2a1c05; box-shadow: var(--shadow-sm), inset 0 1px 0 rgba(255,255,255,0.3); }
.btn-primary:hover { background: var(--amber-deep); color: #fff; box-shadow: var(--shadow-md); }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line-1); }
.btn-ghost:hover { border-color: var(--amber); color: var(--amber-deep); }
.btn-lg { padding: 16px 34px; font-size: 1.05rem; }

/* ── Cards / badges ── */
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: clamp(22px, 4vw, 40px); box-shadow: var(--shadow-sm); }
.badge { display: inline-flex; align-items: center; gap: 6px; padding: 4px 12px; border-radius: 999px;
  font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.08em; text-transform: uppercase;
  font-weight: 500; background: var(--surface-2); color: var(--ink-1); border: 1px solid var(--line); }
.badge-ok { background: var(--ok-bg); color: var(--ok); border-color: transparent; }
.badge-amber { background: var(--amber-soft); color: var(--amber-deep); border-color: transparent; }

/* ── Reveal-on-scroll ── Content is visible by default; only hidden once
   site.js marks the document .js-reveal (so no-JS / failed-JS still shows it). */
.reveal { transition: opacity .7s var(--ease), transform .7s var(--ease); }
.js-reveal .reveal { opacity: 0; transform: translateY(22px); }
.js-reveal .reveal.is-in { opacity: 1; transform: none; }
.reveal-d1 { transition-delay: .08s; } .reveal-d2 { transition-delay: .16s; }
.reveal-d3 { transition-delay: .24s; } .reveal-d4 { transition-delay: .32s; }

/* ============================ LANDING ===================================== */
.hero { position: relative; padding: clamp(56px, 11vw, 132px) 0 clamp(40px, 7vw, 90px); }
.hero-grid { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: clamp(28px, 5vw, 72px); align-items: center; }
.hero h1 { font-size: var(--step-5); font-weight: 800; margin-bottom: 0.35em; }
.hero h1 em { font-style: italic; color: var(--amber-deep); }
.hero .lede { max-width: 38ch; margin-bottom: 30px; }
.cta-row { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; }
.hero-note { margin-top: 18px; font-family: var(--font-mono); font-size: 0.78rem; color: var(--muted); }

/* hero visual: a stacked "lesson card" mock */
.hero-visual { position: relative; }
.hero-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg); padding: 26px; transform: rotate(1.4deg); }
.hero-card::before { content: ""; position: absolute; inset: 18px -14px -16px 18px; z-index: -1;
  background: var(--pine-soft); border: 1px solid var(--line); border-radius: var(--radius-lg); transform: rotate(-3deg); }
.hero-card .hc-eyebrow { font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.18em;
  text-transform: uppercase; color: var(--amber-deep); }
.hero-card h3 { font-size: 1.5rem; margin: 6px 0 14px; }
.hero-opt { display: flex; align-items: center; gap: 10px; padding: 11px 14px; margin-bottom: 8px;
  border: 1px solid var(--line); border-radius: var(--radius-sm); background: var(--input-bg); font-size: 0.92rem; }
.hero-opt .dotmark { width: 16px; height: 16px; border-radius: 50%; border: 2px solid var(--line-1); flex: none; }
.hero-opt.is-correct { border-color: var(--ok); background: var(--ok-bg); }
.hero-opt.is-correct .dotmark { border-color: var(--ok); background: var(--ok); }
.hero-locked { margin-top: 14px; font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--muted); display: flex; align-items: center; gap: 7px; }

/* trust marquee */
.trust { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 22px 0;
  background: color-mix(in srgb, var(--paper-1) 50%, transparent); }
.trust-inner { display: flex; align-items: center; gap: clamp(24px, 6vw, 70px); flex-wrap: wrap; justify-content: center; }
.trust-label { font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--muted); }
.trust-logo { font-family: var(--font-display); font-weight: 700; font-size: 1.15rem; color: var(--ink-1); opacity: 0.8; }

/* section scaffolding */
.section { padding: clamp(56px, 9vw, 110px) 0; }
.section-head { max-width: 60ch; margin-bottom: clamp(30px, 5vw, 56px); }
.section-head h2 { font-size: var(--step-3); }
.section--alt { background: color-mix(in srgb, var(--paper-1) 55%, transparent);
  border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }

/* how-it-works steps */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(18px, 3vw, 30px); }
.step { position: relative; padding-top: 22px; }
.step-n { font-family: var(--font-mono); font-weight: 700; font-size: 0.8rem; color: var(--amber-deep);
  letter-spacing: 0.1em; border-top: 2px solid var(--amber); padding-top: 12px; display: inline-block; }
.step h3 { font-size: 1.4rem; margin: 12px 0 8px; }
.step p { color: var(--ink-1); margin: 0; }

/* feature rows (alternating) */
.feature { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(28px, 6vw, 80px); align-items: center;
  padding: clamp(34px, 6vw, 70px) 0; border-bottom: 1px solid var(--line); }
.feature:last-child { border-bottom: 0; }
.feature:nth-child(even) .feature-media { order: -1; }
.feature h3 { font-size: var(--step-2); }
.feature p { color: var(--ink-1); font-size: 1.05rem; }
.feature-list { list-style: none; padding: 0; margin: 18px 0 0; display: grid; gap: 10px; }
.feature-list li { padding-left: 26px; position: relative; color: var(--ink-1); }
.feature-list li::before { content: "→"; position: absolute; left: 0; color: var(--amber-deep); font-weight: 700; }
.feature-media { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow-md); aspect-ratio: 4 / 3; display: grid; place-items: center; overflow: hidden; position: relative; }
.feature-media .glyph { font-family: var(--font-display); font-size: clamp(3rem, 9vw, 7rem); font-weight: 800;
  color: var(--amber); opacity: 0.5; }

/* big pull-quote */
.pullquote { text-align: center; max-width: 70ch; margin: 0 auto; }
.pullquote blockquote { font-family: var(--font-display); font-weight: 600; font-style: italic;
  font-size: var(--step-3); line-height: 1.22; margin: 0 auto; max-width: 16em; color: var(--ink);
  text-wrap: balance; }
.pullquote cite { display: block; margin-top: 22px; font-family: var(--font-mono); font-size: 0.78rem;
  letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); font-style: normal; }

/* stat band */
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(18px, 4vw, 50px); text-align: center; }
.stat .num { font-family: var(--font-display); font-weight: 800; font-size: var(--step-4); color: var(--amber-deep); line-height: 1; }
.stat .lbl { font-family: var(--font-mono); font-size: 0.74rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); margin-top: 10px; }
/* word-based commitments (not numbers) — smaller, balanced, italic display */
.stats--words .num { font-size: var(--step-2); font-style: italic; text-wrap: balance; color: var(--ink); }
.stats--words .stat { padding: 0 8px; }

/* CTA band */
.cta-band { position: relative; text-align: center; padding: clamp(50px, 9vw, 100px) clamp(20px,5vw,40px); overflow: hidden;
  background: linear-gradient(135deg, var(--pine), color-mix(in srgb, var(--pine) 60%, #000)); color: #f1ece0;
  border-radius: var(--radius-lg); }
.cta-band h2 { color: #fff; font-size: var(--step-3); }
.cta-band p { color: rgba(241,236,224,0.82); max-width: 50ch; margin: 0 auto 26px; }
.cta-band .btn-primary { background: var(--amber); color: #241803; }

/* ============================ CATALOG ===================================== */
.page-head { padding: clamp(40px, 7vw, 80px) 0 clamp(20px, 3vw, 36px); }
.page-head h1 { font-size: var(--step-4); }
.course-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: clamp(18px, 2.5vw, 28px);
  padding-bottom: clamp(50px, 8vw, 90px); }
.course-card { display: flex; flex-direction: column; background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-sm); color: var(--ink);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s; }
.course-card:hover { text-decoration: none; transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--line-1); }
.course-cover { aspect-ratio: 16 / 9; position: relative; display: flex; align-items: flex-end; padding: 16px;
  background: linear-gradient(145deg, hsl(var(--h, 36) 55% 42%), hsl(calc(var(--h, 36) + 28) 50% 28%)); }
.course-cover::after { content: ""; position: absolute; inset: 0; opacity: 0.5; mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='100' height='100'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.5'/%3E%3C/svg%3E"); }
.course-cover .ccode { position: relative; font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.14em;
  text-transform: uppercase; color: rgba(255,255,255,0.92); font-weight: 500;
  background: rgba(0,0,0,0.25); padding: 5px 10px; border-radius: 999px; backdrop-filter: blur(4px); }
.course-card-body { padding: 20px 22px 22px; display: flex; flex-direction: column; flex: 1; }
.course-card-body h2 { font-size: 1.3rem; line-height: 1.15; margin: 0 0 8px; }
.course-card-body p { color: var(--muted); font-size: 0.92rem; margin: 0; }
.course-card-meta { margin-top: auto; padding-top: 16px; display: flex; align-items: center; justify-content: space-between;
  font-family: var(--font-mono); font-size: 0.74rem; letter-spacing: 0.04em; color: var(--ink-1); }
.course-card-meta .go { color: var(--amber-deep); font-weight: 700; }

/* empty state */
.empty { text-align: center; padding: clamp(48px, 9vw, 110px) 0; }
.empty .glyph { font-family: var(--font-display); font-size: 3.4rem; color: var(--amber); opacity: 0.55; margin-bottom: 14px; }
.empty .eyebrow { justify-content: center; }
.empty h2 { font-size: var(--step-2); margin: 4px 0 14px; }
.empty .lede { max-width: 52ch; margin: 0 auto 28px; }

/* ============================ COURSE PAGE ================================= */
.crumbs { font-family: var(--font-mono); font-size: 0.74rem; letter-spacing: 0.06em; color: var(--muted); padding: 26px 0 0; }
.crumbs a { color: var(--ink-1); } .crumbs span { color: var(--amber-deep); }
.course-hero { display: grid; grid-template-columns: 1.4fr 0.9fr; gap: clamp(28px, 5vw, 60px);
  padding: clamp(26px, 4vw, 44px) 0 clamp(36px, 5vw, 56px); align-items: start; }
.course-hero h1 { font-size: var(--step-4); margin: 14px 0 16px; }
.course-meta-row { display: flex; flex-wrap: wrap; gap: 10px; margin: 18px 0 26px; }
.course-aside { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow-md); padding: 24px; position: sticky; top: 86px; }
.course-aside .price-ish { font-family: var(--font-display); font-weight: 700; font-size: 1.4rem; }
.aside-fact { display: flex; justify-content: space-between; gap: 12px; padding: 10px 0; border-top: 1px solid var(--line);
  font-size: 0.9rem; }
.aside-fact:first-of-type { border-top: 0; }
.aside-fact .k { color: var(--muted); font-family: var(--font-mono); font-size: 0.74rem; letter-spacing: 0.05em; text-transform: uppercase; }

.outcomes { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.outcomes li { padding-left: 30px; position: relative; color: var(--ink-1); }
.outcomes li::before { content: "✓"; position: absolute; left: 0; top: -1px; color: var(--ok); font-weight: 800; }

.lesson-list { list-style: none; padding: 0; margin: 22px 0 0; display: flex; flex-direction: column; }
.lesson-row { display: flex; align-items: center; gap: 18px; padding: 18px 4px; border-top: 1px solid var(--line);
  transition: background .2s, padding-left .2s; }
.lesson-row:hover { background: color-mix(in srgb, var(--paper-1) 60%, transparent); padding-left: 12px; }
.lesson-row:last-child { border-bottom: 1px solid var(--line); }
.lesson-num { width: 40px; height: 40px; flex: none; border-radius: 50%; background: var(--surface-2);
  color: var(--amber-deep); font-family: var(--font-mono); font-weight: 700; display: grid; place-items: center; }
.lesson-meta { flex: 1; min-width: 0; }
.lesson-meta h3 { font-family: var(--font-body); font-weight: 600; font-size: 1.05rem; margin: 0 0 3px; letter-spacing: 0; }
.lesson-meta .sub { font-family: var(--font-mono); font-size: 0.72rem; color: var(--muted); letter-spacing: 0.03em; }

/* ── Content/legal pages (about, contact, privacy) ── */
.doc { max-width: 70ch; margin: 0 auto; padding: clamp(40px,7vw,88px) 0 clamp(56px,9vw,104px); }
.doc h1 { font-size: var(--step-4); margin-bottom: .35em; }
.doc h2 { font-size: var(--step-1); margin: 1.7em 0 .4em; }
.doc .lede { margin-bottom: 1.4em; }
.doc p { color: var(--ink-1); font-size: 1.05rem; }
.doc strong { color: var(--ink); }
.doc .updated { margin-top: 2em; padding-top: 1.2em; border-top: 1px solid var(--line); }

/* ── Auth cards ── */
.auth-card { max-width: 440px; margin: clamp(40px,8vh,90px) auto; }
.auth-card h1 { font-size: var(--step-2); }
.stack { display: flex; flex-direction: column; gap: 10px; margin-top: 20px; }
.stack label { font-family: var(--font-mono); font-size: 0.74rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink-1); }
.inline-form { display: inline; }
input[type="email"], input[type="text"] { width: 100%; padding: 13px 15px; border: 1px solid var(--line-1);
  border-radius: var(--radius-sm); background: var(--input-bg); color: var(--ink); font: inherit; }
input:focus { outline: none; border-color: var(--amber); box-shadow: 0 0 0 3px var(--amber-soft); }
.stack .btn { margin-top: 8px; }
.alert { padding: 11px 15px; border-radius: var(--radius-sm); font-size: 0.92rem; margin: 0 0 6px; }
.alert-err { background: var(--err-bg); color: var(--err); }

/* ── Footer ── */
.site-footer { margin-top: auto; border-top: 1px solid var(--line);
  background: color-mix(in srgb, var(--paper-1) 60%, transparent); }
.footer-inner { display: grid; grid-template-columns: 1.5fr 1fr 1fr; gap: 30px;
  padding: clamp(40px, 6vw, 64px) clamp(18px,5vw,44px) 30px; max-width: var(--maxw); margin: 0 auto; }
.footer-brand-blk .brand { font-size: 1.5rem; }
.footer-brand-blk p { color: var(--muted); font-size: 0.9rem; max-width: 32ch; margin-top: 10px; }
.footer-col h4 { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--muted); margin: 0 0 14px; font-weight: 500; }
.footer-col a { display: block; color: var(--ink-1); font-size: 0.92rem; margin-bottom: 9px; }
.footer-bar { border-top: 1px solid var(--line); padding: 18px clamp(18px,5vw,44px); max-width: var(--maxw); margin: 0 auto;
  display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap;
  font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.04em; color: var(--muted); }

/* ── Mobile nav ── */
.nav-toggle { display: none; background: none; border: 0; cursor: pointer; color: var(--ink); padding: 6px; }

@media (max-width: 860px) {
  .hero-grid, .course-hero, .feature, .footer-inner { grid-template-columns: 1fr; }
  .steps, .stats { grid-template-columns: 1fr; gap: 24px; }
  .feature:nth-child(even) .feature-media { order: 0; }
  .outcomes { grid-template-columns: 1fr; }
  .course-aside { position: static; }
  .hero-visual { max-width: 440px; }
  .nav-toggle { display: inline-grid; place-items: center; }
  .topbar nav { position: fixed; inset: 60px 0 auto 0; flex-direction: column; align-items: stretch; gap: 0;
    background: var(--paper-1); border-bottom: 1px solid var(--line); padding: 8px clamp(18px,5vw,44px) 18px;
    box-shadow: var(--shadow-md); transform: translateY(-130%); transition: transform .35s var(--ease); }
  .topbar nav.is-open { transform: none; }
  .topbar nav .nav-link, .topbar nav .nav-link-btn { padding: 14px 0; border-bottom: 1px solid var(--line); font-size: 0.9rem; }
  .topbar nav .theme-toggle { margin-top: 12px; align-self: flex-start; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001ms !important; transition-duration: .001ms !important; }
  .reveal { opacity: 1; transform: none; }
}