/* ================================================================
   ALKANO ARTES MARCIALES — FOUNDATION v1.0
   HITO I / FASE 1
   Sistema global: mobile-first, accesible, sin framework.
   ================================================================ */

/* 1. RESET / BASE ------------------------------------------------ */
*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  color-scheme: dark;
  background: #070708;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-width: 320px;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

img, picture, video, svg { display: block; max-width: 100%; }
img { height: auto; }
button, input, textarea, select { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
a { color: inherit; }
p, h1, h2, h3 { overflow-wrap: break-word; }

/* 2. TOKENS ------------------------------------------------------ */
:root {
  --color-bg: #070708;
  --color-surface: #111114;
  --color-surface-2: #17171b;
  --color-surface-3: #202026;
  --color-primary: #e60000;
  --color-primary-hover: #ff1a1a;
  --color-primary-ink: #ffffff;
  --color-text: #ffffff;
  --color-muted: #b5b7c0;
  --color-subtle: #8f929d;
  --color-border: rgba(255, 255, 255, .12);
  --color-border-strong: rgba(255, 255, 255, .22);
  --color-focus: #ffffff;
  --color-success: #25d366;

  --font-body: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-display: Oswald, "Arial Narrow", "Roboto Condensed", ui-sans-serif, sans-serif;

  --container: 75rem;
  --measure: 44rem;
  --header-height: 4.5rem;

  --space-1: .375rem;
  --space-2: .75rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
  --space-7: 4.5rem;
  --space-8: 6rem;

  --radius-sm: .35rem;
  --radius-md: .65rem;
  --radius-lg: 1rem;
  --radius-pill: 999px;

  --shadow-sm: 0 8px 24px rgba(0,0,0,.2);
  --shadow-lg: 0 22px 50px rgba(0,0,0,.4);

  --motion-fast: 150ms;
  --motion-base: 250ms;
  --motion-slow: 340ms;
  --ease-standard: cubic-bezier(.2,.8,.2,1);
  --ease-out: cubic-bezier(.16,1,.3,1);
}

/* 3. TYPOGRAPHY -------------------------------------------------- */
h1, h2, h3 {
  margin: 0;
  color: var(--color-text);
  font-family: var(--font-display);
  font-weight: 650;
  line-height: 1.08;
  text-transform: uppercase;
  letter-spacing: .025em;
}

h1 { font-size: clamp(2.6rem, 9vw, 5.8rem); }
h2 { font-size: clamp(2rem, 6vw, 3.5rem); }
h3 { font-size: clamp(1.25rem, 3vw, 1.65rem); }
p { margin: 0; }

.eyebrow {
  margin: 0 0 var(--space-2);
  color: var(--color-primary-hover);
  font-family: var(--font-display);
  font-size: .82rem;
  font-weight: 650;
  letter-spacing: .16em;
  text-transform: uppercase;
}

.lead {
  max-width: var(--measure);
  color: #dedfe4;
  font-size: clamp(1.05rem, 2.4vw, 1.25rem);
}

.text-muted { color: var(--color-muted); }

/* 4. LAYOUT ------------------------------------------------------ */
.container {
  width: min(100% - 2rem, var(--container));
  margin-inline: auto;
}

.section { padding-block: var(--space-7); }
.section--tight { padding-block: var(--space-6); }
.section--surface { background: var(--color-surface); }
.section--surface-2 { background: var(--color-surface-2); }

.section-header {
  display: grid;
  gap: var(--space-3);
  max-width: 48rem;
  margin-bottom: var(--space-5);
}

.grid { display: grid; gap: var(--space-4); }
.grid--cards { grid-template-columns: 1fr; }

.stack { display: grid; gap: var(--space-4); }
.cluster { display: flex; flex-wrap: wrap; gap: var(--space-3); align-items: center; }

/* 5. ACCESSIBILITY ---------------------------------------------- */
.skip-link {
  position: fixed;
  z-index: 9999;
  top: .75rem;
  left: .75rem;
  transform: translateY(-180%);
  padding: .7rem 1rem;
  border-radius: var(--radius-sm);
  background: #fff;
  color: #070708;
  font-weight: 800;
  transition: transform var(--motion-fast) var(--ease-standard);
}
.skip-link:focus { transform: translateY(0); }

:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 4px;
}

.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0,0,0,0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

/* 6. BUTTONS / LINKS -------------------------------------------- */
.btn {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  justify-content: center;
  gap: .6rem;
  padding: .75rem 1.15rem;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-family: var(--font-display);
  font-weight: 650;
  line-height: 1.1;
  letter-spacing: .06em;
  text-decoration: none;
  text-transform: uppercase;
  cursor: pointer;
  transition:
    transform var(--motion-fast) var(--ease-standard),
    background-color var(--motion-fast) var(--ease-standard),
    border-color var(--motion-fast) var(--ease-standard),
    color var(--motion-fast) var(--ease-standard),
    box-shadow var(--motion-fast) var(--ease-standard);
}

.btn--primary {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
  box-shadow: 0 9px 22px rgba(230,0,0,.18);
}
.btn--primary:hover { background: var(--color-primary-hover); border-color: var(--color-primary-hover); transform: translateY(-1px); }

.btn--secondary { background: transparent; border-color: var(--color-border-strong); color: var(--color-text); }
.btn--secondary:hover { background: rgba(255,255,255,.06); border-color: rgba(255,255,255,.38); transform: translateY(-1px); }

.btn--neutral { background: var(--color-surface-3); border-color: var(--color-border); color: var(--color-text); }
.btn--neutral:hover { background: #292930; border-color: var(--color-border-strong); }

.text-link {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  gap: .35rem;
  color: #fff;
  font-weight: 700;
  text-underline-offset: .22em;
}
.text-link:hover { color: var(--color-primary-hover); }

/* 7. HEADER / NAV ----------------------------------------------- */
.site-header {
  position: sticky;
  z-index: 1000;
  top: 0;
  border-bottom: 1px solid var(--color-border);
  background: rgba(7,7,8,.96);
}

.site-header__inner {
  min-height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

.brand {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  text-decoration: none;
}
.brand img { width: auto; height: 3.4rem; }

.nav-toggle {
  display: none;
  width: 2.9rem;
  height: 2.9rem;
  padding: 0;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: #fff;
  cursor: pointer;
}

.nav-toggle__icon,
.nav-toggle__icon::before,
.nav-toggle__icon::after {
  display: block;
  width: 1.25rem;
  height: 2px;
  margin-inline: auto;
  background: currentColor;
  content: "";
  transition: transform var(--motion-fast) var(--ease-standard), opacity var(--motion-fast) var(--ease-standard);
}
.nav-toggle__icon { position: relative; }
.nav-toggle__icon::before { position: absolute; top: -.42rem; left: 0; }
.nav-toggle__icon::after { position: absolute; top: .42rem; left: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__icon { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__icon::before { transform: translateY(.42rem) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__icon::after { transform: translateY(-.42rem) rotate(-45deg); }

.site-nav { width: 100%; }
.site-nav__list,
.subnav {
  margin: 0;
  padding: 0;
  list-style: none;
}
.site-nav__list { display: grid; gap: .15rem; }
.nav-link,
.subnav__link,
.subnav-toggle {
  display: flex;
  width: 100%;
  min-height: 2.75rem;
  align-items: center;
  padding: .68rem .75rem;
  border: 0;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-text);
  font-family: var(--font-display);
  font-weight: 550;
  letter-spacing: .035em;
  text-align: left;
  text-decoration: none;
  cursor: pointer;
  transition: background-color var(--motion-fast) var(--ease-standard), color var(--motion-fast) var(--ease-standard);
}
.nav-link:hover,
.subnav__link:hover,
.subnav-toggle:hover { background: rgba(255,255,255,.06); }
.nav-link[aria-current="page"] { color: var(--color-primary-hover); }

.nav-item--dropdown { position: relative; }
.subnav-toggle { justify-content: space-between; gap: .55rem; }
.subnav-toggle svg { width: .95rem; transition: transform var(--motion-fast) var(--ease-standard); }
.subnav-toggle[aria-expanded="true"] svg { transform: rotate(180deg); }
.subnav {
  display: grid;
  gap: .1rem;
  padding-left: .75rem;
}
html.js .subnav[hidden] { display: none; }

.nav-cta { margin-top: .35rem; }

/* progressive enhancement: sin JS la navegación mobile queda visible */
html.js .nav-toggle { display: inline-grid; place-items: center; flex: 0 0 auto; }
html.js .site-nav {
  position: absolute;
  top: 100%;
  left: 0;
  max-height: calc(100dvh - var(--header-height));
  overflow-y: auto;
  padding: .75rem 1rem 1.25rem;
  border-bottom: 1px solid var(--color-border);
  background: #0b0b0d;
  box-shadow: var(--shadow-lg);
}
html.js .site-nav[hidden] { display: none; }
html.menu-open body { overflow: hidden; }

/* 8. HERO ------------------------------------------------------- */
.hero {
  position: relative;
  min-height: min(44rem, calc(100svh - var(--header-height)));
  display: grid;
  align-items: end;
  isolation: isolate;
  overflow: hidden;
}
.hero__media,
.hero__overlay { position: absolute; inset: 0; }
.hero__media { z-index: -2; }
.hero__media img { width: 100%; height: 100%; object-fit: cover; }
.hero__overlay {
  z-index: -1;
  background: linear-gradient(180deg, rgba(7,7,8,.18) 0%, rgba(7,7,8,.74) 58%, #070708 100%);
}
.hero__content {
  display: grid;
  gap: var(--space-4);
  max-width: 52rem;
  padding-block: clamp(5rem, 18vw, 9rem) var(--space-7);
}
.hero__actions { display: flex; flex-wrap: wrap; gap: var(--space-3); }

/* 9. COMPONENTS ------------------------------------------------- */
.card {
  height: 100%;
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
  transition: transform var(--motion-base) var(--ease-standard), border-color var(--motion-base) var(--ease-standard), background-color var(--motion-base) var(--ease-standard);
}
.card:hover { transform: translateY(-2px); border-color: var(--color-border-strong); background: var(--color-surface-2); }
.card__body { display: grid; gap: var(--space-3); }
.card__media {
  overflow: hidden;
  margin: calc(var(--space-4) * -1) calc(var(--space-4) * -1) var(--space-4);
  border-radius: var(--radius-md) var(--radius-md) 0 0;
  aspect-ratio: 16 / 10;
  background: #0c0c0e;
}
.card__media img { width: 100%; height: 100%; object-fit: cover; }

.split { display: grid; gap: var(--space-5); align-items: center; }
.split__media { overflow: hidden; border-radius: var(--radius-lg); aspect-ratio: 4 / 3; background: var(--color-surface); }
.split__media img { width: 100%; height: 100%; object-fit: cover; }

.schedule-card {
  display: grid;
  gap: .55rem;
  padding: var(--space-4);
  border-left: 3px solid var(--color-primary);
  background: var(--color-surface);
}
.schedule-card dl { display: grid; gap: .4rem; margin: 0; }
.schedule-card div { display: grid; grid-template-columns: minmax(6.5rem, .55fr) 1fr; gap: .75rem; }
.schedule-card dt { color: var(--color-muted); }
.schedule-card dd { margin: 0; font-weight: 700; }

.instructor {
  display: grid;
  gap: var(--space-4);
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
}

.faq { display: grid; gap: .75rem; }
.faq details { border: 1px solid var(--color-border); border-radius: var(--radius-md); background: var(--color-surface); }
.faq summary { min-height: 3rem; display: flex; align-items: center; padding: .9rem 1rem; font-weight: 750; cursor: pointer; }
.faq details > div { padding: 0 1rem 1rem; color: var(--color-muted); }

.cta-band {
  display: grid;
  gap: var(--space-4);
  align-items: center;
  padding: var(--space-5);
  border: 1px solid rgba(230,0,0,.45);
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, rgba(230,0,0,.14), rgba(255,255,255,.025));
}

/* 10. FOOTER ----------------------------------------------------- */
.site-footer { border-top: 1px solid var(--color-border); background: #050506; }
.site-footer__grid { display: grid; gap: var(--space-5); padding-block: var(--space-6); }
.site-footer h2, .site-footer h3 { font-size: 1rem; }
.footer-links { display: grid; gap: .25rem; margin: .7rem 0 0; padding: 0; list-style: none; }
.footer-links a { display: inline-flex; min-height: 2.75rem; align-items: center; color: var(--color-muted); text-decoration: none; }
.footer-links a:hover { color: #fff; }
.site-footer__meta { padding-block: var(--space-3); border-top: 1px solid var(--color-border); color: var(--color-subtle); font-size: .9rem; }

/* 11. WHATSAPP --------------------------------------------------- */
.whatsapp-float {
  position: fixed;
  z-index: 900;
  right: max(1rem, env(safe-area-inset-right));
  bottom: max(1rem, env(safe-area-inset-bottom));
  display: grid;
  width: 3.35rem;
  height: 3.35rem;
  place-items: center;
  border: 1px solid rgba(255,255,255,.24);
  border-radius: 50%;
  background: #138a42;
  color: #fff;
  box-shadow: 0 12px 30px rgba(0,0,0,.38);
  transition: transform var(--motion-fast) var(--ease-standard), background-color var(--motion-fast) var(--ease-standard);
}
.whatsapp-float:hover { transform: translateY(-2px); background: #17a34f; }
.whatsapp-float svg { width: 1.55rem; height: 1.55rem; }

/* 12. MOTION / REVEALS ------------------------------------------ */
[data-reveal] { opacity: 1; transform: none; }
html.js.motion-ok [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity var(--motion-slow) var(--ease-out), transform var(--motion-slow) var(--ease-out);
}
html.js.motion-ok [data-reveal].is-visible { opacity: 1; transform: translateY(0); }

/* 13. PREVIEW-ONLY ---------------------------------------------- */
.foundation-note {
  border-bottom: 1px solid #584b00;
  background: #2b2500;
  color: #fff5ad;
  font-size: .92rem;
}
.foundation-note .container { padding-block: .65rem; }
.component-label {
  margin-bottom: .75rem;
  color: var(--color-subtle);
  font-family: var(--font-display);
  font-size: .78rem;
  letter-spacing: .12em;
  text-transform: uppercase;
}

/* 14. RESPONSIVE ------------------------------------------------- */
@media (min-width: 48rem) {
  .container { width: min(100% - 3rem, var(--container)); }
  .section { padding-block: var(--space-8); }
  .grid--cards { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .split { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: var(--space-6); }
  .instructor { grid-template-columns: minmax(12rem, .55fr) minmax(0, 1fr); align-items: center; }
  .cta-band { grid-template-columns: minmax(0, 1fr) auto; padding: var(--space-6); }
  .site-footer__grid { grid-template-columns: 1.2fr .8fr .9fr; }
}

@media (min-width: 64rem) {
  :root { --header-height: 5rem; }
  .brand img { height: 4.2rem; }
  html.js .nav-toggle { display: none; }
  .site-nav,
  html.js .site-nav {
    position: static;
    display: block !important;
    width: auto;
    max-height: none;
    overflow: visible;
    padding: 0;
    border: 0;
    background: transparent;
    box-shadow: none;
  }
  .site-nav__list { display: flex; align-items: center; gap: .05rem; }
  .nav-link, .subnav-toggle { width: auto; padding-inline: .62rem; }
  .nav-cta { margin: 0 0 0 .3rem; }
  .subnav {
    position: absolute;
    top: calc(100% + .4rem);
    left: 0;
    min-width: 15rem;
    padding: .5rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: #0d0d10;
    box-shadow: var(--shadow-lg);
  }
  /* CSS fallback for mouse/keyboard if JS is unavailable */
  html:not(.js) .nav-item--dropdown:hover .subnav,
  html:not(.js) .nav-item--dropdown:focus-within .subnav { display: grid; }
  .grid--cards { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

/* 15. REDUCED MOTION -------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    scroll-behavior: auto !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
  [data-reveal] { opacity: 1 !important; transform: none !important; }
}