/* ============================================================================
   CalisthenAI Web — design system
   Single source of truth. This file IS the site's stylesheet AND the content of
   the "CalisthenAI Web" project on claude.ai/design. Never fork it.

   Direction: dark editorial, high contrast. Near-black ground, oversized
   display type, one electric accent (lime) with violet reserved for AI moments.
   Corners stay tight — this is a poster, not a bubble.

   Everything is authored with CSS logical properties so the Arabic locale
   mirrors to RTL without a single override.
   ============================================================================ */

/* ---------------------------------------------------------------- 1. TOKENS */

:root {
  color-scheme: dark;

  /* -- Neutral ramp (cool-tinted, 250°) ----------------------------------- */
  --neutral-950: oklch(0.130 0.006 250);   /* page ground              #08090B */
  --neutral-900: oklch(0.175 0.008 250);   /* surface 1               #101216 */
  --neutral-850: oklch(0.210 0.009 250);   /* surface 2               #17191E */
  --neutral-800: oklch(0.250 0.010 250);   /* surface 3               #1E2126 */
  --neutral-700: oklch(0.320 0.011 250);   /* strong border           #2A2E35 */
  --neutral-600: oklch(0.420 0.012 250);   /* faint text / icon       #3E434B */
  --neutral-500: oklch(0.550 0.012 250);   /* muted text              #6B7178 */
  --neutral-400: oklch(0.660 0.010 250);   /* secondary text          #8E949B */
  --neutral-300: oklch(0.780 0.008 250);
  --neutral-200: oklch(0.870 0.006 250);
  --neutral-100: oklch(0.940 0.004 250);
  --neutral-50:  oklch(0.980 0.003 250);   /* primary text            #F7F8F9 */

  /* -- Accent: electric lime ---------------------------------------------- */
  --accent-100: oklch(0.965 0.055 120);
  --accent-200: oklch(0.935 0.105 120);
  --accent-300: oklch(0.905 0.155 120);
  --accent-400: oklch(0.880 0.190 120);
  --accent-500: oklch(0.855 0.210 120);    /* base                    #C6F94A */
  --accent-600: oklch(0.750 0.190 120);
  --accent-700: oklch(0.620 0.160 120);
  --accent-800: oklch(0.470 0.125 120);
  --accent-900: oklch(0.310 0.085 120);

  /* -- Second voice: violet, reserved for AI ------------------------------ */
  --ai-100: oklch(0.950 0.040 300);
  --ai-300: oklch(0.830 0.120 300);
  --ai-500: oklch(0.680 0.200 300);        /* base — ties to app       #A56BFF */
  --ai-700: oklch(0.520 0.180 300);
  --ai-900: oklch(0.300 0.110 300);

  /* -- Semantic ----------------------------------------------------------- */
  --success: oklch(0.790 0.170 160);
  --warning: oklch(0.820 0.160 78);
  --danger:  oklch(0.660 0.210 22);

  /* -- Roles -------------------------------------------------------------- */
  --bg:            var(--neutral-950);
  --surface:       var(--neutral-900);
  --surface-raised:var(--neutral-850);
  --surface-high:  var(--neutral-800);
  --border:        oklch(0.320 0.011 250 / 0.7);
  --border-soft:   oklch(0.320 0.011 250 / 0.38);
  --text:          var(--neutral-50);
  --text-secondary:var(--neutral-400);
  --text-muted:    var(--neutral-500);
  --accent:        var(--accent-500);
  --on-accent:     var(--neutral-950);

  /* -- Type --------------------------------------------------------------- */
  --font-display: 'Archivo', 'Archivo Fallback', system-ui, sans-serif;
  --font-ui:      'Inter', 'Inter Fallback', system-ui, -apple-system, sans-serif;
  --font-prose:   'Newsreader', Georgia, 'Times New Roman', serif;
  --font-mono:    ui-monospace, 'SFMono-Regular', 'Cascadia Mono', Menlo, monospace;

  /* Fluid scale — 360px → 1440px viewport */
  --text-2xs:  0.6875rem;                                   /* 11 */
  --text-xs:   0.75rem;                                     /* 12 */
  --text-sm:   0.875rem;                                    /* 14 */
  --text-base: 1rem;                                        /* 16 */
  --text-md:   clamp(1.0625rem, 0.99rem + 0.32vw, 1.1875rem);
  --text-lg:   clamp(1.25rem,  1.15rem + 0.45vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1.32rem + 0.80vw, 2rem);
  --text-2xl:  clamp(1.875rem, 1.55rem + 1.42vw, 2.75rem);
  --text-3xl:  clamp(2.375rem, 1.83rem + 2.40vw, 4rem);
  --text-4xl:  clamp(2.75rem, 1.95rem + 3.55vw, 4.75rem);
  /* Hero only. Capped so a nine-letter Spanish or German word still fits the
     left column of .split--text-lead without colliding with the media. */
  --text-5xl:  clamp(3rem, 1.75rem + 5.55vw, 6.5rem);
  /* Archivo's width axis. The hero runs condensed so long words survive; the
     rest of the display type stays near-normal. */
  --display-stretch: 78%;

  --leading-tight:  0.94;
  --leading-snug:   1.12;
  --leading-normal: 1.5;
  --leading-prose:  1.72;

  --tracking-tight: -0.035em;
  --tracking-snug:  -0.018em;
  --tracking-wide:  0.02em;
  --tracking-caps:  0.14em;

  /* -- Space — 8pt grid --------------------------------------------------- */
  --space-1: 0.25rem;  --space-2: 0.5rem;   --space-3: 0.75rem;
  --space-4: 1rem;     --space-5: 1.5rem;   --space-6: 2rem;
  --space-7: 2.5rem;   --space-8: 3rem;     --space-9: 4rem;
  --space-10: 5rem;    --space-11: 6.5rem;  --space-12: 8rem;
  --space-13: 10rem;

  /* Section rhythm — the single knob for vertical density */
  --section-y: clamp(4rem, 3rem + 5vw, 9rem);

  /* -- Radius — tight on purpose ------------------------------------------ */
  --radius-xs: 2px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-pill: 999px;

  /* -- Elevation ---------------------------------------------------------- */
  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.5);
  --shadow-md: 0 8px 24px -6px oklch(0 0 0 / 0.6);
  --shadow-lg: 0 24px 64px -12px oklch(0 0 0 / 0.75);
  --glow-accent: 0 0 0 1px oklch(0.855 0.21 120 / 0.28), 0 8px 40px -8px oklch(0.855 0.21 120 / 0.35);

  /* -- Motion ------------------------------------------------------------- */
  --ease-out:    cubic-bezier(0.16, 1, 0.30, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --dur-fast:   140ms;
  --dur-base:   240ms;
  --dur-slow:   420ms;

  /* -- Layout ------------------------------------------------------------- */
  --measure: 68ch;
  --container: 1280px;
  --container-narrow: 760px;
  --container-wide: 1560px;
  --gutter: clamp(1.25rem, 0.9rem + 1.6vw, 2.5rem);
  --nav-h: 68px;
}

/* --------------------------------------------------------- 2. RESET + BASE */

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

* { margin: 0; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-block-start: calc(var(--nav-h) + var(--space-5));
}

body {
  min-block-size: 100svh;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-ui);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  font-synthesis-weight: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img, svg, video, canvas, picture {
  display: block;
  max-inline-size: 100%;
  block-size: auto;
}

input, button, textarea, select { font: inherit; color: inherit; }
button { background: none; border: 0; cursor: pointer; }

a {
  color: inherit;
  text-decoration-color: oklch(0.855 0.21 120 / 0.45);
  text-underline-offset: 0.22em;
  text-decoration-thickness: from-font;
  transition: color var(--dur-fast) var(--ease-out),
              text-decoration-color var(--dur-fast) var(--ease-out);
}
a:hover { color: var(--accent-400); text-decoration-color: currentColor; }

:focus-visible {
  outline: 2px solid var(--accent-500);
  outline-offset: 3px;
  border-radius: var(--radius-xs);
}

::selection { background: oklch(0.855 0.21 120 / 0.3); color: var(--neutral-50); }

::-webkit-scrollbar { inline-size: 10px; block-size: 10px; }
::-webkit-scrollbar-track { background: var(--neutral-950); }
::-webkit-scrollbar-thumb {
  background: var(--neutral-700);
  border-radius: var(--radius-pill);
  border: 2px solid var(--neutral-950);
}
::-webkit-scrollbar-thumb:hover { background: var(--neutral-600); }

/* ------------------------------------------------------------- 3. TYPOGRAPHY */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: var(--leading-snug);
  letter-spacing: var(--tracking-snug);
  text-wrap: balance;
}

.display {
  font-family: var(--font-display);
  font-weight: 900;
  font-stretch: var(--display-stretch);
  font-size: var(--text-5xl);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  text-transform: uppercase;
  text-wrap: balance;
  overflow-wrap: break-word;
  hyphens: manual;
}

.h1 { font-size: var(--text-4xl); line-height: var(--leading-tight); letter-spacing: var(--tracking-tight); }
/* Long headlines — article and guide titles — step down a size so a 45-character
   title doesn't eat the whole first screen. Applied by the template on length. */
.h1--long { font-size: clamp(2.125rem, 1.55rem + 2.55vw, 3.375rem); line-height: 1.02; letter-spacing: var(--tracking-tight); }
.h2 { font-size: var(--text-3xl); line-height: 1.04; letter-spacing: var(--tracking-tight); }
.h3 { font-size: var(--text-2xl); }
.h4 { font-size: var(--text-xl); }
.h5 { font-size: var(--text-lg); }

.lead {
  font-size: var(--text-lg);
  line-height: 1.45;
  color: var(--text-secondary);
  text-wrap: pretty;
  max-inline-size: 54ch;
}

.kicker {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-ui);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: var(--tracking-caps);
  color: var(--accent-500);
}
.kicker::before {
  content: "";
  inline-size: 22px;
  block-size: 1px;
  background: currentColor;
  flex: none;
}
.kicker--muted { color: var(--text-muted); }
.kicker--ai { color: var(--ai-300); }

.eyebrow {
  font-size: var(--text-2xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: var(--tracking-caps);
  color: var(--text-muted);
}

.muted { color: var(--text-secondary); }
.faint { color: var(--text-muted); }
.accent-text { color: var(--accent-500); }

/* Outlined display word — used to break up big hero lines */
.outline-word {
  -webkit-text-stroke: 1.5px var(--neutral-600);
  color: transparent;
  paint-order: stroke fill;
}

/* --------------------------------------------------------------- 4. LAYOUT */

.container {
  inline-size: 100%;
  max-inline-size: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.container--narrow { max-inline-size: var(--container-narrow); }
.container--wide   { max-inline-size: var(--container-wide); }

.section { padding-block: var(--section-y); }
.section--tight { padding-block: calc(var(--section-y) * 0.6); }
.section--flush-top { padding-block-start: 0; }

.stack > * + * { margin-block-start: var(--flow, var(--space-4)); }
.stack--sm { --flow: var(--space-3); }
.stack--lg { --flow: var(--space-6); }
.stack--xl { --flow: var(--space-8); }

.cluster {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  align-items: center;
}
/* Icons are display:block from the reset, so a bare `<span>{icon} text</span>`
   inside a cluster would break the line. Make those spans flex rows. */
.cluster > span:not([class]) { display: inline-flex; align-items: center; gap: var(--space-2); }

.grid { display: grid; gap: var(--space-5); }
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr)); }
.grid--4 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 200px), 1fr)); }

/* Asymmetric editorial split — content left, media right */
.split {
  display: grid;
  gap: clamp(var(--space-6), 4vw, var(--space-10));
  align-items: center;
  grid-template-columns: 1fr;
}
@media (min-width: 900px) {
  .split { grid-template-columns: minmax(0, 1fr) minmax(0, 1.08fr); }
  .split--reverse > :first-child { order: 2; }
  .split--text-lead { grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr); }
}

/* A hairline that reads as an editorial rule, not a divider */
.rule {
  border: 0;
  border-block-start: 1px solid var(--border-soft);
  margin-block: var(--space-8);
}

/* Section heading block: kicker + title + lead, flush left */
.section-head {
  display: grid;
  gap: var(--space-4);
  max-inline-size: 62ch;
  margin-block-end: var(--space-8);
}
.section-head--center { margin-inline: auto; text-align: center; justify-items: center; }
.section-head--center .kicker::before { display: none; }

/* ------------------------------------------------------------ 5. COMPONENTS */

/* -- 5.1 Buttons --------------------------------------------------------- */
.btn {
  --btn-bg: transparent;
  --btn-fg: var(--text);
  --btn-border: var(--border);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding-block: 0.8125rem;
  padding-inline: var(--space-5);
  min-block-size: 48px;
  background: var(--btn-bg);
  color: var(--btn-fg);
  border: 1px solid var(--btn-border);
  border-radius: var(--radius-pill);
  font-family: var(--font-ui);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: var(--tracking-wide);
  text-decoration: none;
  white-space: nowrap;
  transition: background var(--dur-fast) var(--ease-out),
              color var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out),
              transform var(--dur-fast) var(--ease-out);
}
.btn:hover { color: var(--btn-fg); transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn[disabled], .btn[aria-disabled="true"] { opacity: 0.45; pointer-events: none; }

.btn--primary { --btn-bg: var(--accent-500); --btn-fg: var(--on-accent); --btn-border: var(--accent-500); }
.btn--primary:hover { --btn-bg: var(--accent-400); --btn-border: var(--accent-400); }
.btn--primary:active { --btn-bg: var(--accent-600); --btn-border: var(--accent-600); }

.btn--secondary { --btn-bg: var(--surface-high); --btn-border: var(--border); }
.btn--secondary:hover { --btn-bg: var(--neutral-700); }

.btn--ghost { --btn-border: transparent; color: var(--text-secondary); }
.btn--ghost:hover { --btn-bg: oklch(1 0 0 / 0.05); --btn-fg: var(--text); }

.btn--ai { --btn-bg: var(--ai-500); --btn-fg: var(--neutral-950); --btn-border: var(--ai-500); }
.btn--ai:hover { --btn-bg: var(--ai-300); --btn-border: var(--ai-300); }

.btn--lg { min-block-size: 56px; padding-inline: var(--space-6); font-size: var(--text-base); }
.btn--sm { min-block-size: 38px; padding-inline: var(--space-4); font-size: var(--text-xs); }
.btn--block { inline-size: 100%; }
.btn--icon { padding-inline: 0; inline-size: 48px; }

/* Arrow that slides on hover — used on text CTAs */
.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 600;
  font-size: var(--text-sm);
  text-decoration: none;
  color: var(--accent-500);
}
.link-arrow svg { transition: transform var(--dur-base) var(--ease-out); }
.link-arrow:hover svg { transform: translateX(4px); }
[dir="rtl"] .link-arrow svg { scale: -1 1; }
[dir="rtl"] .link-arrow:hover svg { transform: translateX(4px); }

/* -- 5.2 Tags ------------------------------------------------------------ */
.tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.3125rem var(--space-3);
  border-radius: var(--radius-pill);
  border: 1px solid var(--border-soft);
  background: oklch(1 0 0 / 0.04);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: var(--tracking-wide);
  color: var(--text-secondary);
  white-space: nowrap;
}
.tag--accent { border-color: oklch(0.855 0.21 120 / 0.35); background: oklch(0.855 0.21 120 / 0.10); color: var(--accent-300); }
.tag--ai     { border-color: oklch(0.680 0.20 300 / 0.4); background: oklch(0.680 0.20 300 / 0.12); color: var(--ai-300); }
.tag--pro    { border-color: oklch(0.820 0.16 78 / 0.4);  background: oklch(0.820 0.16 78 / 0.12);  color: var(--warning); }
.tag--solid  { background: var(--accent-500); color: var(--on-accent); border-color: var(--accent-500); }

/* Difficulty pips — 1..5 filled squares */
.pips { display: inline-flex; gap: 3px; align-items: center; }
.pips i {
  inline-size: 7px; block-size: 7px;
  background: var(--neutral-700);
  border-radius: 1px;
  display: block;
}
.pips i[data-on] { background: var(--accent-500); }

/* -- 5.3 Cards ----------------------------------------------------------- */
.card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  padding: var(--space-5);
  overflow: hidden;
  transition: border-color var(--dur-base) var(--ease-out),
              background var(--dur-base) var(--ease-out),
              transform var(--dur-base) var(--ease-out);
}
.card--link:hover {
  border-color: oklch(0.855 0.21 120 / 0.45);
  background: var(--surface-raised);
  transform: translateY(-3px);
}
.card--flush { padding: 0; }
.card--bare { background: transparent; border-color: var(--border-soft); }

.card__media {
  position: relative;
  aspect-ratio: 16 / 10;
  background: var(--neutral-850);
  overflow: hidden;
}
.card__media img { inline-size: 100%; block-size: 100%; object-fit: cover; }
.card__media--square { aspect-ratio: 1; }
.card__media--tall { aspect-ratio: 4 / 5; }

.card__body { padding: var(--space-5); display: flex; flex-direction: column; gap: var(--space-3); flex: 1; }
.card__kicker { font-size: var(--text-2xs); text-transform: uppercase; letter-spacing: var(--tracking-caps); color: var(--accent-500); font-weight: 600; }
.card__title { font-size: var(--text-lg); font-weight: 700; letter-spacing: var(--tracking-snug); text-wrap: balance; }
.card__text { color: var(--text-secondary); font-size: var(--text-sm); line-height: 1.6; }
.card__meta {
  margin-block-start: auto;
  padding-block-start: var(--space-3);
  display: flex; gap: var(--space-3); align-items: center;
  font-size: var(--text-xs); color: var(--text-muted);
}

/* Whole-card click target without nesting interactive elements */
.card__link::after { content: ""; position: absolute; inset: 0; }

/* Numbered step card — "cómo funciona" */
.step { position: relative; padding-block-start: var(--space-6); }
.step__n {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 900;
  color: transparent;
  -webkit-text-stroke: 1.5px var(--neutral-700);
  line-height: 1;
  display: block;
  margin-block-end: var(--space-4);
}
.step--active .step__n { -webkit-text-stroke-color: var(--accent-500); }

/* -- 5.4 Stat tiles ------------------------------------------------------ */
.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 150px), 1fr));
  gap: 1px;
  background: var(--border-soft);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.stat { background: var(--bg); padding: var(--space-5); display: grid; gap: var(--space-1); }
.stat__value {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 800;
  letter-spacing: var(--tracking-tight);
  line-height: 1;
  font-variant-numeric: tabular-nums;
}
.stat__label { font-size: var(--text-xs); color: var(--text-muted); letter-spacing: var(--tracking-wide); }

/* -- 5.5 Navigation ------------------------------------------------------ */
.nav {
  position: sticky;
  inset-block-start: 0;
  z-index: 100;
  block-size: var(--nav-h);
  display: flex;
  align-items: center;
  background: oklch(0.130 0.006 250 / 0.72);
  backdrop-filter: blur(16px) saturate(1.4);
  -webkit-backdrop-filter: blur(16px) saturate(1.4);
  border-block-end: 1px solid transparent;
  transition: border-color var(--dur-base) var(--ease-out),
              background var(--dur-base) var(--ease-out);
}
.nav[data-scrolled] { border-block-end-color: var(--border-soft); background: oklch(0.130 0.006 250 / 0.92); }
.nav__inner { display: flex; align-items: center; gap: var(--space-5); inline-size: 100%; }

.nav__brand {
  display: flex; align-items: center; gap: var(--space-3);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-base);
  letter-spacing: var(--tracking-snug);
  text-decoration: none;
  flex: none;
}
.nav__brand img { inline-size: 30px; block-size: 30px; border-radius: var(--radius-sm); }
.nav__brand:hover { color: var(--text); }

.nav__links { display: none; gap: var(--space-1); margin-inline-start: var(--space-4); flex: 1; }
@media (min-width: 1000px) { .nav__links { display: flex; } }
.nav__link {
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
}
.nav__link:hover { color: var(--text); background: oklch(1 0 0 / 0.05); }
.nav__link[aria-current] { color: var(--accent-500); }

.nav__actions { display: flex; align-items: center; gap: var(--space-2); margin-inline-start: auto; }

.nav__toggle { display: grid; place-items: center; inline-size: 44px; block-size: 44px; border-radius: var(--radius-sm); }
@media (min-width: 1000px) { .nav__toggle { display: none; } }

/* Mobile drawer */
.nav__drawer {
  position: fixed;
  inset-block: var(--nav-h) 0;
  inset-inline: 0;
  z-index: 99;
  background: var(--bg);
  padding: var(--space-6) var(--gutter) var(--space-9);
  overflow-y: auto;
  display: grid;
  align-content: start;
  gap: var(--space-2);
  translate: 0 -8px;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--dur-base) var(--ease-out),
              translate var(--dur-base) var(--ease-out),
              visibility var(--dur-base);
}
.nav__drawer[data-open] { opacity: 1; translate: 0 0; visibility: visible; }
.nav__drawer a {
  padding: var(--space-4) 0;
  border-block-end: 1px solid var(--border-soft);
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  text-decoration: none;
}

/* Language switcher */
.lang { position: relative; }
.lang__btn {
  display: inline-flex; align-items: center; gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-pill);
  font-size: var(--text-xs); font-weight: 600;
  color: var(--text-secondary);
}
.lang__btn:hover { color: var(--text); border-color: var(--border); }
.lang__menu {
  position: absolute;
  inset-block-start: calc(100% + var(--space-2));
  inset-inline-end: 0;
  z-index: 120;
  min-inline-size: 210px;
  max-block-size: 60vh;
  overflow-y: auto;
  padding: var(--space-2);
  background: var(--surface-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  display: none;
}
.lang__menu[data-open] { display: grid; }
.lang__menu a {
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  text-decoration: none;
  display: flex; gap: var(--space-3); align-items: center;
}
.lang__menu a:hover { background: oklch(1 0 0 / 0.06); color: var(--text); }
.lang__menu a[aria-current] { color: var(--accent-500); }

/* -- 5.6 Footer ---------------------------------------------------------- */
.footer {
  border-block-start: 1px solid var(--border-soft);
  padding-block: var(--space-9) var(--space-6);
  margin-block-start: var(--space-10);
}
.footer__grid {
  display: grid;
  gap: var(--space-7);
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 170px), 1fr));
}
.footer__col h3 {
  font-family: var(--font-ui);
  font-size: var(--text-2xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: var(--tracking-caps);
  color: var(--text-muted);
  margin-block-end: var(--space-4);
}
.footer__col ul { list-style: none; padding: 0; display: grid; gap: var(--space-3); }
.footer__col a { font-size: var(--text-sm); color: var(--text-secondary); text-decoration: none; }
.footer__col a:hover { color: var(--accent-500); }
.footer__bottom {
  margin-block-start: var(--space-8);
  padding-block-start: var(--space-5);
  border-block-start: 1px solid var(--border-soft);
  display: flex; flex-wrap: wrap; gap: var(--space-4);
  justify-content: space-between; align-items: center;
  font-size: var(--text-xs); color: var(--text-muted);
}

/* -- 5.7 Forms ----------------------------------------------------------- */
.field { display: grid; gap: var(--space-2); }
.field > label { font-size: var(--text-sm); font-weight: 600; color: var(--text-secondary); }
.input {
  inline-size: 100%;
  min-block-size: 48px;
  padding: var(--space-3) var(--space-4);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  transition: border-color var(--dur-fast) var(--ease-out), background var(--dur-fast) var(--ease-out);
}
.input::placeholder { color: var(--neutral-600); }
.input:hover { border-color: var(--neutral-600); }
.input:focus-visible { border-color: var(--accent-500); outline: none; box-shadow: 0 0 0 3px oklch(0.855 0.21 120 / 0.18); }
select.input { appearance: none; padding-inline-end: var(--space-8); }

.seg {
  display: inline-flex;
  padding: 3px;
  background: var(--surface);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-pill);
  gap: 2px;
}
.seg-opt {
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-pill);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text-secondary);
  transition: background var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out);
}
.seg-opt:hover { color: var(--text); }
.seg-opt[aria-pressed="true"], .seg-opt[data-active] { background: var(--accent-500); color: var(--on-accent); }

/* Filter chips row — exercise / article catalogs */
.chips { display: flex; flex-wrap: wrap; gap: var(--space-2); }
.chip {
  padding: var(--space-2) var(--space-4);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-pill);
  font-size: var(--text-sm);
  color: var(--text-secondary);
  transition: all var(--dur-fast) var(--ease-out);
}
.chip:hover { border-color: var(--neutral-600); color: var(--text); }
.chip[data-active] { background: var(--accent-500); border-color: var(--accent-500); color: var(--on-accent); font-weight: 600; }

/* -- 5.8 Table ----------------------------------------------------------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--border-soft); border-radius: var(--radius-md); }
.table { inline-size: 100%; border-collapse: collapse; font-size: var(--text-sm); }
.table th, .table td { padding: var(--space-4) var(--space-5); text-align: start; }
.table thead th {
  background: var(--surface);
  font-family: var(--font-ui);
  font-size: var(--text-2xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: var(--tracking-caps);
  color: var(--text-muted);
  white-space: nowrap;
}
.table tbody tr + tr { border-block-start: 1px solid var(--border-soft); }
.table tbody tr:hover { background: oklch(1 0 0 / 0.02); }
.table td[data-yes] { color: var(--accent-500); }
.table td[data-no] { color: var(--neutral-600); }

/* -- 5.9 Pricing --------------------------------------------------------- */
.plan {
  display: flex; flex-direction: column; gap: var(--space-5);
  padding: var(--space-6);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-lg);
  background: var(--surface);
}
.plan--featured {
  border-color: oklch(0.855 0.21 120 / 0.5);
  background: linear-gradient(180deg, oklch(0.855 0.21 120 / 0.07), transparent 42%), var(--surface);
  box-shadow: var(--glow-accent);
}
.plan__price { display: flex; align-items: baseline; gap: var(--space-2); }
.plan__amount { font-family: var(--font-display); font-size: var(--text-3xl); font-weight: 900; letter-spacing: var(--tracking-tight); line-height: 1; }
.plan__period { color: var(--text-muted); font-size: var(--text-sm); }
.plan__was { color: var(--text-muted); text-decoration: line-through; font-size: var(--text-md); }
.plan__list { list-style: none; padding: 0; display: grid; gap: var(--space-3); font-size: var(--text-sm); }
.plan__list li { display: flex; gap: var(--space-3); align-items: flex-start; color: var(--text-secondary); }
.plan__list li[data-on] { color: var(--text); }
.plan__list svg { flex: none; margin-block-start: 2px; }

/* -- 5.10 Testimonials --------------------------------------------------- */
.quote {
  display: flex; flex-direction: column; gap: var(--space-5);
  padding: var(--space-6);
  background: var(--surface);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  break-inside: avoid;
}
.quote__stars { display: flex; gap: 2px; color: var(--accent-500); }
.quote__text { font-size: var(--text-md); line-height: 1.6; text-wrap: pretty; }
.quote__who { display: flex; align-items: center; gap: var(--space-3); margin-block-start: auto; }
.quote__avatar {
  inline-size: 44px; block-size: 44px; border-radius: var(--radius-pill);
  object-fit: cover; flex: none; background: var(--neutral-800);
}
.quote__name { font-weight: 600; font-size: var(--text-sm); }
.quote__detail { font-size: var(--text-xs); color: var(--text-muted); }

/* Masonry-ish column flow so quotes of different length pack tightly */
.quote-wall { columns: 1; column-gap: var(--space-5); }
.quote-wall > * { margin-block-end: var(--space-5); }
@media (min-width: 720px)  { .quote-wall { columns: 2; } }
@media (min-width: 1080px) { .quote-wall { columns: 3; } }

/* -- 5.11 Accordion / FAQ ------------------------------------------------ */
.acc { border-block-start: 1px solid var(--border-soft); }
.acc:last-of-type { border-block-end: 1px solid var(--border-soft); }
.acc > summary {
  display: flex; align-items: center; justify-content: space-between; gap: var(--space-4);
  padding-block: var(--space-5);
  font-family: var(--font-display);
  font-size: var(--text-md);
  font-weight: 700;
  cursor: pointer;
  list-style: none;
}
.acc > summary::-webkit-details-marker { display: none; }
.acc > summary:hover { color: var(--accent-500); }
.acc__icon { flex: none; transition: rotate var(--dur-base) var(--ease-out); color: var(--text-muted); }
.acc[open] .acc__icon { rotate: 45deg; color: var(--accent-500); }
.acc__body { padding-block-end: var(--space-5); color: var(--text-secondary); max-inline-size: var(--measure); }
.acc__body > * + * { margin-block-start: var(--space-3); }

/* -- 5.12 Dialog --------------------------------------------------------- */
.dialog { border: 0; padding: 0; background: transparent; max-inline-size: min(560px, calc(100vw - 2 * var(--gutter))); }
.dialog::backdrop { background: oklch(0.08 0 0 / 0.72); backdrop-filter: blur(4px); }
.dialog__panel {
  background: var(--surface-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  display: grid; gap: var(--space-5);
  box-shadow: var(--shadow-lg);
}
.dialog__actions { display: flex; gap: var(--space-3); justify-content: flex-end; flex-wrap: wrap; }

/* -- 5.13 Media treatment ------------------------------------------------ */
/* Photographs sit in a framed well with a bottom scrim so captions stay legible. */
.frame {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--neutral-900);
  border: 1px solid var(--border-soft);
  isolation: isolate;
}
.frame img, .frame video { inline-size: 100%; block-size: 100%; object-fit: cover; }
.frame::after {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 55%, oklch(0.13 0.006 250 / 0.55));
  pointer-events: none;
}
.frame--plain::after { display: none; }
.frame__caption {
  position: absolute;
  inset-block-end: var(--space-4);
  inset-inline-start: var(--space-4);
  z-index: 1;
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: var(--tracking-wide);
  color: var(--neutral-100);
  text-shadow: 0 1px 8px oklch(0 0 0 / 0.8);
}

/* The 108 exercise animations are anatomical illustrations drawn on white.
   Fighting that would mean recutting every file, so the system leans into it:
   each one becomes a specimen plate — a light card on the dark page, like an
   atlas figure. `multiply` maps every source white to the exact same plate
   tone, so 108 files that were never art-directed together now match. */
.plate {
  --plate-bg: oklch(0.900 0.007 250);
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--plate-bg);
  box-shadow: inset 0 0 0 1px oklch(0 0 0 / 0.10);
  isolation: isolate;
  transition: background var(--dur-base) var(--ease-out);
}
.plate img { inline-size: 100%; block-size: 100%; object-fit: contain; mix-blend-mode: multiply; }
.plate--tint { --plate-bg: oklch(0.905 0.030 120); }   /* accent-washed plate */
.plate__caption {
  position: absolute;
  inset-block-end: 0; inset-inline: 0;
  z-index: 1;
  padding: var(--space-4) var(--space-4) var(--space-3);
  font-family: var(--font-ui);
  font-size: var(--text-2xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: var(--tracking-caps);
  color: oklch(0.35 0.01 250);
  background: linear-gradient(180deg, transparent, oklch(0.900 0.007 250 / 0.94) 55%);
}
.plate__badge {
  position: absolute;
  inset-block-start: var(--space-3); inset-inline-start: var(--space-3);
  z-index: 1;
  padding: 2px var(--space-2);
  border-radius: var(--radius-xs);
  background: var(--neutral-950);
  color: var(--accent-500);
  font-size: var(--text-2xs);
  font-weight: 700;
  letter-spacing: var(--tracking-caps);
}
.card--link:hover .plate { --plate-bg: oklch(0.935 0.007 250); }
.plate--empty { display: grid; place-items: center; color: oklch(0.72 0.01 250); }

/* Device mock for app screenshots */
.device {
  position: relative;
  inline-size: 100%;
  max-inline-size: 300px;
  aspect-ratio: 9 / 19.5;
  border-radius: 34px;
  padding: 8px;
  background: linear-gradient(160deg, var(--neutral-700), var(--neutral-900));
  box-shadow: var(--shadow-lg);
}
.device > img { inline-size: 100%; block-size: 100%; object-fit: cover; border-radius: 27px; background: var(--neutral-900); }

/* -- 5.14 Prose (articles) ----------------------------------------------- */
.prose {
  font-family: var(--font-prose);
  font-size: clamp(1.0625rem, 1rem + 0.3vw, 1.1875rem);
  line-height: var(--leading-prose);
  color: var(--neutral-200);
  max-inline-size: var(--measure);
}
.prose > * + * { margin-block-start: 1.35em; }
.prose h2 {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  margin-block-start: 2.2em;
  margin-block-end: 0.1em;
  color: var(--text);
  scroll-margin-block-start: calc(var(--nav-h) + var(--space-6));
}
.prose h3 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  margin-block-start: 1.9em;
  margin-block-end: 0.1em;
  color: var(--text);
  scroll-margin-block-start: calc(var(--nav-h) + var(--space-6));
}
.prose h2 + p, .prose h3 + p { margin-block-start: 0.65em; }
.prose strong { color: var(--text); font-weight: 700; }
.prose a { color: var(--accent-400); }
.prose ul, .prose ol { padding-inline-start: 1.35em; display: grid; gap: 0.55em; }
.prose li::marker { color: var(--accent-700); }
.prose blockquote {
  border-inline-start: 2px solid var(--accent-500);
  padding-inline-start: var(--space-5);
  font-style: italic;
  color: var(--neutral-300);
}
.prose figure { margin-block: 2.2em; max-inline-size: none; }
.prose figcaption { font-family: var(--font-ui); font-size: var(--text-xs); color: var(--text-muted); margin-block-start: var(--space-3); }
.prose code {
  font-family: var(--font-mono); font-size: 0.88em;
  background: var(--surface-high); padding: 0.15em 0.4em; border-radius: var(--radius-xs);
}
.prose table { inline-size: 100%; border-collapse: collapse; font-family: var(--font-ui); font-size: var(--text-sm); }
.prose th, .prose td { padding: var(--space-3) var(--space-4); text-align: start; border-block-end: 1px solid var(--border-soft); }
.prose th { color: var(--text-muted); font-weight: 600; text-transform: uppercase; font-size: var(--text-2xs); letter-spacing: var(--tracking-caps); }

/* Key-takeaway callout inside articles */
.callout {
  font-family: var(--font-ui);
  font-size: var(--text-sm);
  line-height: 1.65;
  padding: var(--space-5);
  border: 1px solid var(--border-soft);
  border-inline-start: 2px solid var(--accent-500);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text-secondary);
}
.callout > strong { display: block; color: var(--text); margin-block-end: var(--space-2); font-family: var(--font-display); }

/* Table of contents rail */
.toc { position: sticky; inset-block-start: calc(var(--nav-h) + var(--space-5)); font-size: var(--text-sm); }
.toc ol { list-style: none; padding: 0; display: grid; gap: var(--space-2); border-inline-start: 1px solid var(--border-soft); }
.toc a {
  display: block;
  padding: var(--space-1) var(--space-4);
  margin-inline-start: -1px;
  border-inline-start: 1px solid transparent;
  color: var(--text-muted);
  text-decoration: none;
}
.toc a:hover { color: var(--text); }
.toc a[aria-current] { color: var(--accent-500); border-inline-start-color: var(--accent-500); }

/* -- 5.15 Misc ----------------------------------------------------------- */
.skip-link {
  position: absolute; inset-block-start: -100px; inset-inline-start: var(--space-4);
  z-index: 999; padding: var(--space-3) var(--space-5);
  background: var(--accent-500); color: var(--on-accent);
  border-radius: 0 0 var(--radius-sm) var(--radius-sm); font-weight: 600;
}
.skip-link:focus { inset-block-start: 0; color: var(--on-accent); }

.visually-hidden {
  position: absolute; inline-size: 1px; block-size: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip-path: inset(50%); white-space: nowrap; border: 0;
}

.marquee { overflow: hidden; -webkit-mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent); mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent); }
.marquee__track { display: flex; gap: var(--space-6); inline-size: max-content; animation: marquee 46s linear infinite; }
.marquee:hover .marquee__track { animation-play-state: paused; }
@keyframes marquee { to { transform: translateX(-50%); } }
[dir="rtl"] .marquee__track { animation-direction: reverse; }

/* Ambient accent glow behind hero content */
.glow { position: relative; isolation: isolate; }
.glow::before {
  content: "";
  position: absolute;
  z-index: -1;
  inset-block-start: -30%;
  inset-inline-start: 50%;
  translate: -50% 0;
  inline-size: min(1100px, 130%);
  aspect-ratio: 1;
  background: radial-gradient(circle, oklch(0.855 0.21 120 / 0.14), transparent 62%);
  pointer-events: none;
}

/* ------------------------------------------------- 6. SCROLL REVEAL + MOTION */

[data-reveal] {
  opacity: 0;
  translate: 0 18px;
  transition: opacity 700ms var(--ease-out), translate 700ms var(--ease-out);
  transition-delay: var(--reveal-delay, 0ms);
}
[data-reveal][data-shown] { opacity: 1; translate: 0 0; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  [data-reveal] { opacity: 1; translate: none; }
}

/* --------------------------------------------------------------- 7. RTL/i18n */

/* Everything above uses logical properties, so RTL needs only directional art. */
[dir="rtl"] .outline-word { letter-spacing: 0; }
[dir="rtl"] .step__n { direction: ltr; }
[dir="rtl"] .stat__value { direction: ltr; }

/* Scripts without a display face fall back to their text face at a heavier
   optical weight, since Archivo's 900 has no counterpart in CJK/Arabic. */
:lang(ja), :lang(ko), :lang(ar), :lang(hi) {
  --font-display: var(--font-ui);
  --tracking-tight: -0.01em;
  --tracking-snug: 0;
  --leading-tight: 1.15;
}
/* CJK rides on the system faces — see the note in fonts.css. */
:lang(ja) { --font-ui: 'Inter', 'Hiragino Sans', 'Hiragino Kaku Gothic ProN', 'Yu Gothic', 'Noto Sans JP', 'Meiryo', sans-serif; }
:lang(ko) { --font-ui: 'Inter', 'Apple SD Gothic Neo', 'Malgun Gothic', 'Noto Sans KR', sans-serif; }
:lang(ja) .display, :lang(ko) .display, :lang(ar) .display, :lang(hi) .display {
  font-weight: 800;
  font-stretch: normal;
  text-transform: none;
}
:lang(ar) .prose, :lang(ja) .prose, :lang(ko) .prose, :lang(hi) .prose { font-family: var(--font-ui); }

/* -------------------------------------------------------------- 8. PRINTING */

@media print {
  .nav, .footer, .toc, .skip-link { display: none; }
  body { background: #fff; color: #000; }
  .prose { color: #000; max-inline-size: none; }
}