/* ============================================================================
   ALTO NIVEL — Sistema de diseño "Granito y Altitud"
   Paleta A · Display: Barlow Condensed · Body: Source Sans 3 · Datos: JetBrains Mono
   ========================================================================== */

/* ───────────────────────────── TOKENS ───────────────────────────── */
:root {
  /* Color — superficies */
  --canvas:         #1C1E1F;            /* roca granítica en sombra */
  --canvas-raised:  #232628;            /* secciones alternas / cards */
  --canvas-deep:    #0D1B2A;            /* cielo en altitud, antes del amanecer */
  --canvas-overlay: rgba(13, 16, 17, 0.68); /* overlay sobre fotografías */
  --surface-card:   #26292B;

  /* Color — texto */
  --text-primary:   #E8ECF0;            /* nieve con sombra fría */
  --text-secondary: #A9B0B5;
  --text-muted:     #8A9095;
  --text-inverse:   #161312;            /* sobre el acento cálido */

  /* Color — acento (el único calor; usar con restricción) */
  --accent:         #C4773A;            /* roca al sol de la tarde */
  --accent-hover:   #A9622D;
  --accent-text:    #D6925A;            /* variante para texto sobre fondo oscuro (contraste AA) */
  --accent-subtle:  rgba(196, 119, 58, 0.15);

  /* Color — bordes */
  --border-subtle:  rgba(232, 236, 240, 0.07);
  --border-default: rgba(232, 236, 240, 0.14);
  --border-strong:  rgba(196, 119, 58, 0.55);

  /* Dificultad (color-coded) */
  --lvl-iniciacion: #6E9E7E;
  --lvl-tecnica:    #C4773A;
  --lvl-alta:       #B5564B;

  /* Tipografía */
  --font-display: "Barlow Condensed", system-ui, sans-serif;
  --font-body:    "Source Sans 3", system-ui, -apple-system, sans-serif;
  --font-mono:    "JetBrains Mono", ui-monospace, "SFMono-Regular", monospace;

  /* Escala tipográfica */
  --text-xs:   0.6875rem;  /* 11 */
  --text-sm:   0.8125rem;  /* 13 */
  --text-base: 1rem;       /* 16 */
  --text-md:   1.125rem;   /* 18 */
  --text-lg:   1.375rem;   /* 22 */
  --text-xl:   2rem;       /* 32 */
  --text-2xl:  3rem;       /* 48 */
  --text-3xl:  4rem;       /* 64 */
  --text-hero: clamp(48px, 8vw, 96px);

  /* Espaciado (base 4) */
  --sp-1: 4px;  --sp-2: 8px;  --sp-3: 12px; --sp-4: 16px; --sp-6: 24px;
  --sp-8: 32px; --sp-12: 48px; --sp-16: 64px; --sp-24: 96px; --sp-32: 128px;

  /* Layout */
  --maxw: 1280px;
  --gutter: 24px;
  --measure: 600px;          /* ~68 caracteres */

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --header-h: 68px;
}

/* ───────────────────────────── RESET ───────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { scroll-behavior: smooth; scroll-padding-top: var(--header-h); -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  background: var(--canvas);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; cursor: pointer; }
ul, ol { list-style: none; padding: 0; }
.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

/* Foco visible en claro y oscuro */
:focus-visible {
  outline: 2px solid var(--accent-text);
  outline-offset: 3px;
  border-radius: 2px;
}

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

.skip-link {
  position: fixed; top: -100%; left: 16px; z-index: 200;
  background: var(--accent); color: var(--text-inverse);
  padding: 10px 16px; font-weight: 600; border-radius: 4px;
}
.skip-link:focus { top: 12px; }

.wrap { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: var(--gutter); }

/* ───────────────────────── TIPOGRAFÍA BASE ───────────────────────── */
.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-text);
}

.section { padding-block: 64px; }
@media (min-width: 768px)  { .section { padding-block: 96px; } }
@media (min-width: 1024px) { .section { padding-block: 128px; } }

.section-head { max-width: 760px; margin-bottom: var(--sp-12); }
.section-head__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-xl);
  line-height: 1.05;
  letter-spacing: 0.01em;
  text-transform: uppercase;
}
@media (min-width: 768px) { .section-head__title { font-size: var(--text-2xl); } }
.section-head__lead {
  margin-top: var(--sp-4);
  max-width: var(--measure);
  color: var(--text-secondary);
  font-size: var(--text-md);
}

/* ───────────────────────────── BOTONES ───────────────────────────── */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: var(--sp-2);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-md);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 16px 28px;
  min-height: 52px;
  border: 1px solid transparent;
  border-radius: 2px;
  transition: background-color .2s var(--ease), border-color .2s var(--ease), transform .2s var(--ease);
}
.btn--accent { background: var(--accent); color: var(--text-inverse); }
.btn--accent:hover { background: var(--accent-hover); }
.btn--block { width: 100%; }

.link-arrow {
  display: inline-block;
  font-weight: 600;
  color: var(--accent-text);
  border-bottom: 1px solid transparent;
  transition: border-color .2s var(--ease);
}
.link-arrow:hover { border-bottom-color: var(--accent-text); }

/* ───────────────────────────── HEADER ───────────────────────────── */
.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  height: var(--header-h);
  transition: background-color .3s var(--ease), border-color .3s var(--ease);
  border-bottom: 1px solid transparent;
}
.site-header.is-scrolled {
  background: rgba(28, 30, 31, 0.92);
  backdrop-filter: blur(8px);
  border-bottom-color: var(--border-subtle);
}
.site-header__inner { display: flex; align-items: center; justify-content: space-between; height: var(--header-h); }

.brand { display: inline-flex; align-items: baseline; gap: 8px; font-family: var(--font-display); font-weight: 700; }
.brand__mark { color: var(--accent-text); font-size: 0.8em; transform: translateY(-1px); }
.brand__name { font-size: var(--text-lg); letter-spacing: 0.06em; text-transform: uppercase; }

.nav-desktop { display: none; gap: var(--sp-8); }
.nav-desktop a {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: var(--text-md);
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--text-secondary);
  padding-block: 4px;
  border-bottom: 2px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}
.nav-desktop a:hover { color: var(--text-primary); border-bottom-color: var(--accent); }
@media (min-width: 768px) { .nav-desktop { display: flex; } }

.nav-toggle {
  display: inline-flex; flex-direction: column; justify-content: center; gap: 5px;
  width: 44px; height: 44px; padding: 10px; background: none; border: 0;
}
.nav-toggle span { display: block; height: 2px; background: var(--text-primary); transition: transform .25s var(--ease), opacity .2s; }
@media (min-width: 768px) { .nav-toggle { display: none; } }

/* ─────────────────────────── MOBILE NAV ─────────────────────────── */
.mobile-nav { position: fixed; inset: 0; z-index: 150; visibility: hidden; }
.mobile-nav.is-open { visibility: visible; }
.mobile-nav__overlay {
  position: absolute; inset: 0; background: rgba(10, 11, 12, 0.6);
  opacity: 0; transition: opacity .3s var(--ease);
}
.mobile-nav.is-open .mobile-nav__overlay { opacity: 1; }
.mobile-nav__panel {
  position: absolute; inset: 0 0 0 auto; width: min(82vw, 360px);
  background: var(--canvas-raised); border-left: 1px solid var(--border-default);
  padding: var(--sp-16) var(--sp-8) var(--sp-8);
  display: flex; flex-direction: column; gap: 4px;
  transform: translateX(100%); transition: transform .3s var(--ease);
}
.mobile-nav.is-open .mobile-nav__panel { transform: translateX(0); }
.mobile-nav__panel a {
  font-family: var(--font-display); font-size: var(--text-lg); text-transform: uppercase;
  letter-spacing: 0.04em; padding: 14px 4px; min-height: 48px; display: flex; align-items: center;
  border-bottom: 1px solid var(--border-subtle);
}
.mobile-nav__cta { color: var(--accent-text); border-bottom: 0 !important; margin-top: var(--sp-4); }
.mobile-nav__close {
  position: absolute; top: 16px; right: 16px; width: 44px; height: 44px;
  background: none; border: 0; font-size: 22px; color: var(--text-secondary);
}

/* ───────────────────────────── HERO ───────────────────────────── */
.hero { position: relative; min-height: 100svh; display: flex; align-items: flex-end; overflow: hidden; }
.hero__bg {
  position: absolute; inset: 0;
  /* ART DIRECTION: reemplazar por foto vertical con escala humana */
  background: var(--canvas-deep) url("../assets/img/bg-masthead.jpg") center/cover no-repeat;
  filter: saturate(0.7) brightness(0.8);
  transform: scale(1.0);
  animation: kenburns 16s ease-out forwards;
}
.hero__grade {
  position: absolute; inset: 0;
  background:
    linear-gradient(180deg, rgba(13,16,17,0.55) 0%, rgba(13,16,17,0.35) 35%, rgba(28,30,31,0.92) 88%, var(--canvas) 100%),
    radial-gradient(120% 80% at 50% 35%, transparent 40%, rgba(13,16,17,0.45) 100%);
}
.hero__inner { position: relative; z-index: 2; padding-block: var(--sp-24) var(--sp-16); }

.eyebrow { display: block; }
.altimeter { margin: var(--sp-6) 0 var(--sp-4); line-height: 0.86; }
.altimeter__num {
  display: block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-hero);
  letter-spacing: -0.01em;
  /* Tipografía como terreno: la montaña vive dentro del número */
  background: url("../assets/img/bg-masthead.jpg") center 35% / cover;
  filter: contrast(1.05);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: var(--accent-text); /* fallback si no hay soporte de clip */
  text-shadow: 0 2px 30px rgba(0,0,0,0.35);
}
.altimeter__cap {
  font-family: var(--font-mono); font-size: var(--text-sm); letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--text-secondary); margin-top: 6px;
}

.hero__title {
  font-family: var(--font-display); font-weight: 700;
  font-size: clamp(2rem, 5.5vw, var(--text-3xl)); line-height: 1.02;
  letter-spacing: 0.005em; max-width: 16ch; margin-top: var(--sp-4);
}
.hero__sub { margin-top: var(--sp-6); max-width: var(--measure); color: var(--text-secondary); font-size: var(--text-md); }
.hero__actions { display: flex; flex-wrap: wrap; align-items: center; gap: var(--sp-6); margin-top: var(--sp-8); }

.scroll-hint {
  position: absolute; left: 50%; bottom: 22px; transform: translateX(-50%); z-index: 2;
  font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: 0.2em;
  text-transform: uppercase; color: var(--text-secondary);
}
.scroll-hint span { position: relative; }
.scroll-hint span::after {
  content: ""; position: absolute; left: 50%; top: 130%; width: 1px; height: 22px;
  background: var(--text-muted); animation: drip 2.4s var(--ease) infinite;
}

/* ───────────────────────── VALOR (stats) ───────────────────────── */
.valor { background: var(--canvas-raised); border-block: 1px solid var(--border-subtle); }
.valor__grid { display: grid; gap: var(--sp-12); }
@media (min-width: 768px) { .valor__grid { grid-template-columns: repeat(3, 1fr); gap: var(--sp-8); } }
.stat { padding-left: var(--sp-4); border-left: 2px solid var(--accent); }
.stat__num {
  font-family: var(--font-display); font-weight: 700; font-size: var(--text-2xl);
  line-height: 1; letter-spacing: 0.01em;
}
.stat__desc { margin-top: var(--sp-3); color: var(--text-secondary); max-width: 34ch; }

/* ───────────────────────── EXPEDICIONES ───────────────────────── */
.filters { display: flex; flex-wrap: wrap; gap: var(--sp-2); margin-bottom: var(--sp-8); }
.filter {
  font-family: var(--font-mono); font-size: var(--text-sm); letter-spacing: 0.04em;
  text-transform: uppercase; color: var(--text-secondary);
  padding: 8px 16px; min-height: 40px; background: none;
  border: 1px solid var(--border-default); border-radius: 2px;
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}
.filter:hover { color: var(--text-primary); border-color: var(--text-muted); }
.filter.is-active { color: var(--text-inverse); background: var(--accent); border-color: var(--accent); }

.exp-grid { display: grid; gap: var(--sp-6); }
@media (min-width: 560px)  { .exp-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .exp-grid { grid-template-columns: repeat(4, 1fr); gap: var(--sp-6); } }

.exp-card > article {
  height: 100%; display: flex; flex-direction: column;
  background: var(--surface-card); border: 1px solid var(--border-default); border-radius: 3px;
  overflow: hidden; transition: border-color .25s var(--ease), transform .25s var(--ease);
}
.exp-card > article:hover { border-color: var(--border-strong); transform: translateY(-3px); }
.exp-card[hidden] { display: none; }

.exp-card__media { position: relative; aspect-ratio: 3 / 4; overflow: hidden; }
.exp-card__media img { width: 100%; height: 100%; object-fit: cover; transition: transform .3s var(--ease); }
.exp-card > article:hover .exp-card__media img { transform: scale(1.04); }

.tag {
  position: absolute; top: 10px; left: 10px;
  font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--text-primary);
  padding: 4px 9px; border-radius: 2px; background: rgba(13,16,17,0.7);
  border-left: 3px solid var(--text-muted); backdrop-filter: blur(2px);
}
.tag--iniciacion { border-left-color: var(--lvl-iniciacion); }
.tag--tecnica    { border-left-color: var(--lvl-tecnica); }
.tag--alta       { border-left-color: var(--lvl-alta); }

.exp-card__body { display: flex; flex-direction: column; gap: var(--sp-3); padding: var(--sp-6); flex: 1; }
.exp-card__name { font-family: var(--font-display); font-weight: 600; font-size: var(--text-lg); text-transform: uppercase; letter-spacing: 0.02em; }
.exp-card__meta { display: grid; gap: 6px; margin-top: auto; }
.exp-card__meta > div { display: flex; justify-content: space-between; gap: var(--sp-4); padding-block: 6px; border-top: 1px solid var(--border-subtle); }
.exp-card__meta dt { color: var(--text-muted); font-size: var(--text-sm); }
.exp-card__meta dd { color: var(--text-primary); font-size: var(--text-sm); }
.exp-card__body .link-arrow { margin-top: var(--sp-2); }
.exp-empty { color: var(--text-secondary); padding-block: var(--sp-8); }

/* ───────────────────────── CREDIBILIDAD ───────────────────────── */
.guides { display: grid; gap: var(--sp-12); }
@media (min-width: 900px) { .guides { grid-template-columns: 1fr 1fr; gap: var(--sp-8) var(--sp-16); } }
.guide { display: grid; grid-template-columns: 96px 1fr; gap: var(--sp-6); align-items: start; }
@media (min-width: 480px) { .guide { grid-template-columns: 140px 1fr; } }
.guide__photo {
  aspect-ratio: 4 / 5; display: grid; place-items: center;
  /* Placeholder hasta foto real: bloque de roca con iniciales */
  background: linear-gradient(160deg, #2c3033, #1a1c1d);
  border: 1px solid var(--border-default); border-radius: 3px;
  font-family: var(--font-display); font-size: var(--text-xl); color: var(--text-muted);
  letter-spacing: 0.05em;
}
.guide__name { font-family: var(--font-display); font-weight: 700; font-size: var(--text-lg); text-transform: uppercase; }
.guide__creds { color: var(--accent-text); font-size: var(--text-sm); margin-top: 4px; }
.guide__quote { margin-top: var(--sp-4); color: var(--text-secondary); font-style: italic; max-width: 42ch; }

.certs {
  margin-top: var(--sp-12); padding-top: var(--sp-6);
  border-top: 1px solid var(--border-subtle);
  color: var(--text-muted); font-size: var(--text-sm); letter-spacing: 0.04em;
}

.testimonial { margin-top: var(--sp-16); max-width: 760px; }
.testimonial blockquote {
  font-family: var(--font-display); font-weight: 500;
  font-size: clamp(1.25rem, 3vw, var(--text-lg)); line-height: 1.35; color: var(--text-primary);
  border-left: 2px solid var(--accent); padding-left: var(--sp-6);
}
.testimonial figcaption { display: flex; flex-wrap: wrap; gap: var(--sp-4); margin-top: var(--sp-4); padding-left: var(--sp-6); }
.testimonial__name { font-weight: 600; }
.testimonial__exp { color: var(--text-muted); font-size: var(--text-sm); }

/* ───────────────────────── EXPERIENCIA (timeline) ───────────────────────── */
.experiencia { background: var(--canvas-raised); border-block: 1px solid var(--border-subtle); }
.timeline { display: grid; gap: var(--sp-8); }
@media (min-width: 768px) { .timeline { grid-template-columns: repeat(5, 1fr); gap: var(--sp-6); } }
.step { position: relative; padding-top: var(--sp-6); border-top: 1px solid var(--border-default); }
.step__num { display: block; color: var(--accent-text); font-size: var(--text-md); margin-bottom: var(--sp-3); }
.step__title { font-family: var(--font-display); font-weight: 600; font-size: var(--text-md); text-transform: uppercase; letter-spacing: 0.02em; line-height: 1.1; }
.step__desc { margin-top: var(--sp-3); color: var(--text-secondary); font-size: var(--text-sm); }

/* ───────────────────────────── CTA ───────────────────────────── */
.cta { position: relative; overflow: hidden; }
.cta__bg {
  position: absolute; inset: 0;
  background: var(--canvas-deep) url("../assets/img/bg-signup.jpg") center/cover no-repeat;
  filter: saturate(0.6) brightness(0.55);
}
.cta__grade { position: absolute; inset: 0; background: linear-gradient(180deg, rgba(13,16,17,0.82), rgba(13,16,17,0.92)); }
.cta__inner { position: relative; z-index: 2; display: grid; gap: var(--sp-12); }
@media (min-width: 900px) { .cta__inner { grid-template-columns: 1fr 1fr; gap: var(--sp-16); align-items: start; } }

.cta__title { font-family: var(--font-display); font-weight: 700; font-size: clamp(1.75rem, 4vw, var(--text-2xl)); line-height: 1.05; margin-top: var(--sp-4); max-width: 18ch; }
.cta__cupos { color: var(--accent-text); }
.cta__lead { margin-top: var(--sp-6); max-width: var(--measure); color: var(--text-secondary); font-size: var(--text-md); }

.whatsapp {
  display: inline-flex; align-items: center; gap: var(--sp-3); margin-top: var(--sp-8);
  color: var(--text-primary); font-weight: 600; min-height: 48px;
}
.whatsapp__icon { color: #25D366; flex: none; }
.whatsapp:hover span { border-bottom: 1px solid var(--text-primary); }

/* Formulario */
.form { background: var(--surface-card); border: 1px solid var(--border-default); border-radius: 4px; padding: var(--sp-8); display: grid; gap: var(--sp-6); }
@media (max-width: 480px) { .form { padding: var(--sp-6); } }
.field { display: grid; gap: 6px; }
.field label { font-size: var(--text-sm); font-weight: 600; color: var(--text-secondary); }
.field__opt { color: var(--text-muted); font-weight: 400; }
.field input, .field select, .field textarea {
  font: inherit; color: var(--text-primary); background: var(--canvas);
  border: 1px solid var(--border-default); border-radius: 3px;
  padding: 12px 14px; min-height: 48px; width: 100%;
  transition: border-color .2s var(--ease), box-shadow .2s var(--ease);
}
.field textarea { min-height: auto; resize: vertical; }
.field select { appearance: none; background-image: linear-gradient(45deg, transparent 50%, var(--text-muted) 50%), linear-gradient(135deg, var(--text-muted) 50%, transparent 50%); background-position: calc(100% - 18px) center, calc(100% - 13px) center; background-size: 5px 5px, 5px 5px; background-repeat: no-repeat; padding-right: 38px; }
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-subtle); }
.field input[aria-invalid="true"], .field select[aria-invalid="true"] { border-color: var(--lvl-alta); }
.field__error { color: #E58C82; font-size: var(--text-sm); min-height: 1em; }
.form__note { color: var(--text-muted); font-size: var(--text-sm); text-align: center; }
.form__status { font-size: var(--text-sm); text-align: center; min-height: 1em; }
.form__status.is-ok { color: var(--lvl-iniciacion); }
.form__status.is-err { color: #E58C82; }

/* ───────────────────────────── FOOTER ───────────────────────────── */
.footer { background: var(--canvas); border-top: 1px solid var(--border-subtle); padding-block: var(--sp-16); }
.footer__inner { display: grid; gap: var(--sp-6); }
.brand--footer .brand__name { font-size: var(--text-md); }
.footer__nav, .footer__social { display: flex; flex-wrap: wrap; gap: var(--sp-6); }
.footer__nav a, .footer__social a { color: var(--text-secondary); font-size: var(--text-sm); }
.footer__nav a:hover, .footer__social a:hover { color: var(--text-primary); }
.footer__certs { color: var(--text-muted); font-size: var(--text-xs); letter-spacing: 0.05em; }
.footer__base { display: flex; flex-wrap: wrap; justify-content: space-between; gap: var(--sp-4); padding-top: var(--sp-6); border-top: 1px solid var(--border-subtle); color: var(--text-muted); font-size: var(--text-sm); }
.footer__base a:hover { color: var(--text-primary); }
.footer__sign { font-family: var(--font-display); color: var(--text-muted); letter-spacing: 0.04em; text-transform: uppercase; font-size: var(--text-sm); }

/* ───────────────────────── SCROLL REVEAL ───────────────────────── */
.reveal { opacity: 0; transform: translateY(20px); transition: opacity .4s var(--ease), transform .4s var(--ease); }
.reveal.is-in { opacity: 1; transform: none; }

/* ───────────────────────── ANIMACIONES ───────────────────────── */
@keyframes kenburns { to { transform: scale(1.05); } }
@keyframes drip { 0% { transform: scaleY(0); transform-origin: top; opacity: 0; } 40% { opacity: 1; } 100% { transform: scaleY(1); transform-origin: top; opacity: 0; } }

/* ───────────────────── PREFERS-REDUCED-MOTION ───────────────────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
  .hero__bg { animation: none; transform: none; }
  .reveal { opacity: 1; transform: none; }
  .scroll-hint span::after { display: none; }
}