/* Baku · sistema de diseño
   Tokens primero; todo lo demás los consume. Modo claro por defecto, oscuro con [data-theme="dark"]. */

:root {
  /* Color */
  --paper: #f4f6f9;        /* fondo: blanco porcelana frío, no crema */
  --surface: #ffffff;      /* superficies elevadas */
  --ink: #0e1626;          /* texto y trazo del logo */
  --slate: #566175;        /* texto secundario (7.0:1 sobre paper) */
  --mist: #d9dfe8;         /* líneas y bordes */
  --subtle: #eef1f6;       /* hover de botones y zonas suaves */
  --dragon: #e3232a;       /* rojo del logo: formas, nunca texto pequeño */
  --dragon-deep: #9f1219;  /* sombra del dragón */
  --dragon-hi: #ff6166;    /* brillo del lomo */
  --ember: #b8161d;        /* rojo para texto y enlaces (5.9:1) */
  --dragon-subtle: #fdeced; /* fondo de elementos activos */
  --danger: #d63b2f;
  --belly: var(--ink);     /* franja del dragón: tinta en claro, blanco en oscuro */
  --slab: #0e1626;         /* bloque invertido de contacto */
  --slab-ink: #f4f6f9;

  /* Tipografía */
  --font-display: "Unbounded", system-ui, sans-serif;
  --font-body: "Onest", system-ui, sans-serif;
  --step--1: 0.875rem;
  --step-0: 1.0625rem;
  --step-1: 1.333rem;
  --step-2: 1.777rem;
  --step-3: 2.369rem;
  --step-4: clamp(2.5rem, 6vw, 4.75rem);

  /* Espacio y forma */
  --gutter: clamp(1rem, 4vw, 3rem);
  --section: clamp(4.5rem, 11vw, 9rem);
  --content: 44rem;        /* carril de lectura; a la derecha vuela el dragón */
  --radius-s: 6px;
  --radius-control: 10px;   /* botones e inputs, igual que EduSIA */
  --shadow-card: 0 1px 2px rgba(14, 22, 38, .06), 0 8px 24px rgba(14, 22, 38, .06);
  --shadow-focus: 0 0 0 3px rgba(227, 35, 42, .35);
  --radius-l: 22px;        /* solo el bloque de contacto, eco de las curvas del logo */
  --ease: cubic-bezier(.2, .7, .2, 1);
}

:root[data-theme="dark"] {
  --paper: #0a121c;        /* el fondo original del logo */
  --surface: #121c2a;
  --ink: #eef1f5;
  --slate: #9aa5b8;
  --mist: #253246;
  --subtle: #18243a;
  --dragon: #ef2f36;
  --dragon-deep: #a8141b;
  --dragon-hi: #ff7a7e;
  --ember: #ff6b70;
  --dragon-subtle: rgba(239, 47, 54, .18);
  --belly: #ffffff;
  --slab: #121c2a;
  --slab-ink: #eef1f5;
}

/* Base */
*, *::before, *::after { box-sizing: border-box; }
html { color-scheme: light; scroll-behavior: smooth; }
:root[data-theme="dark"] { color-scheme: dark; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 var(--step-0)/1.6 var(--font-body);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  transition: background-color .3s var(--ease), color .3s var(--ease);
}
img { max-width: 100%; display: block; }
a { color: var(--ember); text-underline-offset: .2em; }
:focus-visible { outline: 3px solid var(--dragon); outline-offset: 3px; border-radius: 4px; }
h1, h2, h3 { font-family: var(--font-display); line-height: 1.08; margin: 0; letter-spacing: -0.02em; }
h1 { font-size: var(--step-4); font-weight: 800; }
h2 { font-size: var(--step-3); font-weight: 700; }
h3 { font-size: var(--step-1); font-weight: 600; letter-spacing: -0.01em; }
p { margin: 0; max-width: 62ch; }
.lead { font-size: var(--step-1); line-height: 1.5; color: var(--slate); }
.wrap { width: min(100% - 2 * var(--gutter), 76rem); margin-inline: auto; }
.lane { max-width: var(--content); }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* Logo: dos archivos, uno por tema */
.logo { display: inline-flex; }
.logo img { height: 2.25rem; width: auto; }
.logo .on-dark { display: none; }
:root[data-theme="dark"] .logo .on-light { display: none; }
:root[data-theme="dark"] .logo .on-dark { display: block; }

/* Botones: mismo sistema que EduSIA/ArkiSIA (radio de control 10px, alto 48px, negrita, foco de 3px),
   con el rojo de Baku como marca. Una sola acción primary por vista. */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5rem;
  min-height: 3rem; padding: 0 1.5rem; border-radius: var(--radius-control);
  font: 700 var(--step-0)/1 var(--font-body); text-decoration: none;
  border: 1px solid transparent; cursor: pointer;
  transition: background-color .15s var(--ease), border-color .15s var(--ease), color .15s var(--ease);
}
.btn:focus-visible { outline: none; box-shadow: var(--shadow-focus); }
.btn-primary { background: var(--dragon); color: #fff; box-shadow: var(--shadow-card); }
.btn-primary:hover { background: var(--dragon-deep); }
.btn-primary:focus-visible { box-shadow: var(--shadow-card), var(--shadow-focus); }
.btn-secondary { background: var(--surface); color: var(--ink); border-color: var(--mist); }
.btn-secondary:hover { background: var(--subtle); }
.btn-tertiary { background: transparent; color: var(--ember); padding-inline: 1.25rem; margin-left: -1.25rem; }
.btn-tertiary:hover { background: var(--dragon-subtle); }
.btn-danger { background: var(--danger); color: #fff; }

/* Nav */
.nav { position: sticky; top: 0; z-index: 10; background: color-mix(in srgb, var(--paper) 86%, transparent); backdrop-filter: blur(10px); }
.nav .wrap { display: flex; flex-wrap: wrap; align-items: center; gap: .75rem 2rem; padding-block: 1rem; }
.nav nav { order: 2; margin-left: auto; }
.nav .theme-toggle { order: 3; }
.nav ul { display: flex; gap: .25rem; list-style: none; margin: 0; padding: 0; }
.nav ul a { display: block; padding: .5rem .85rem; border-radius: var(--radius-control); color: var(--ink); text-decoration: none; font-weight: 600; }
.nav ul a:hover { background: var(--subtle); }
.nav ul a[aria-current="page"] { color: var(--ember); background: var(--dragon-subtle); }
.theme-toggle {
  width: 2.5rem; height: 2.5rem; border-radius: 50%; border: 2px solid var(--mist);
  background: transparent; color: var(--ink); cursor: pointer; display: grid; place-items: center;
}
.theme-toggle:hover { border-color: var(--ink); }
.theme-toggle svg { width: 1.1rem; height: 1.1rem; }
.theme-toggle .moon { display: none; }
:root[data-theme="dark"] .theme-toggle .sun { display: none; }
:root[data-theme="dark"] .theme-toggle .moon { display: block; }

/* Secciones */
main, footer { position: relative; z-index: 1; }
section { padding-block: var(--section); }
.section-head { display: grid; gap: 1rem; margin-bottom: 3rem; }

.hero { padding-block: clamp(4rem, 12vw, 10rem) var(--section); min-height: 78vh; display: flex; align-items: center; }
.hero h1 { max-width: 13ch; }
.hero .lead { margin-top: 1.75rem; max-width: 36ch; }
.hero .actions { margin-top: 2.5rem; }
.actions { display: flex; flex-wrap: wrap; gap: .75rem; }
.lane > .actions { margin-top: 2.5rem; }
.services .btn-tertiary { margin-top: .5rem; }

/* Cabecera de páginas internas */
.page-head { padding-block: clamp(3.5rem, 9vw, 7rem) 3rem; }
.page-head .lead { margin-top: 1.25rem; max-width: 40ch; }
section.flush { padding-top: 0; }

/* Servicios: filas, no tarjetas */
.services { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--mist); }
.services li { display: grid; grid-template-columns: 15rem 1fr; gap: 1.5rem; padding-block: 1.75rem; border-bottom: 1px solid var(--mist); }
.services p { color: var(--slate); }
.stack { display: flex; flex-wrap: wrap; gap: .4rem; margin-top: .75rem; padding: 0; list-style: none; }
.stack li { all: unset; font-size: var(--step--1); color: var(--ink); background: var(--surface); border: 1px solid var(--mist); padding: .15rem .55rem; border-radius: 999px; }

/* Proceso: es una secuencia real, por eso lleva números */
.steps { counter-reset: step; display: grid; gap: 2.25rem; list-style: none; margin: 0; padding: 0; }
.steps li { counter-increment: step; display: grid; grid-template-columns: 3.5rem 1fr; gap: .25rem 1rem; }
.steps li::before {
  content: counter(step); grid-row: span 2;
  font: 800 var(--step-2)/1 var(--font-display); color: var(--dragon);
}
.steps p { color: var(--slate); }

/* Academia y productos */
.courses { display: grid; gap: 0; border-top: 1px solid var(--mist); }
.course { display: grid; gap: .5rem; padding-block: 1.75rem; border-bottom: 1px solid var(--mist); }
.course .meta { font-size: var(--step--1); color: var(--slate); }
.course p { color: var(--slate); }

.products { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.25rem; }
.product { background: var(--surface); border: 1px solid var(--mist); border-radius: var(--radius-s); padding: 1.75rem; display: flex; flex-direction: column; gap: 1rem; }
.product p { color: var(--slate); }
.product-logo img { height: 2.75rem; width: auto; }
.product-logo .on-dark, :root[data-theme="dark"] .product-logo .on-light { display: none; }
:root[data-theme="dark"] .product-logo .on-dark { display: block; }
.product .actions { margin-left: -1.25rem; gap: 0; margin-top: auto; }
.product .btn-tertiary { margin-left: 0; }

/* Contacto: bloque invertido donde el dragón atrapa la estrella */
.contact .slab {
  background: var(--slab); color: var(--slab-ink); border-radius: var(--radius-l);
  padding: clamp(2.25rem, 6vw, 4.5rem); display: grid; gap: 1.5rem;
}
:root[data-theme="dark"] .contact .slab { border: 1px solid var(--mist); }
.contact .slab .lead { color: color-mix(in srgb, var(--slab-ink) 72%, transparent); }
.contact .slab h2 { max-width: 16ch; }
.contact .slab .lead { max-width: 34ch; }   /* deja libre la mitad derecha para el dragón */

footer { padding-block: 3rem; color: var(--slate); font-size: var(--step--1); }
footer .wrap { display: flex; flex-wrap: wrap; gap: 1rem; justify-content: space-between; align-items: center; }

/* El dragón vive en un lienzo fijo detrás del contenido */
#dragon { position: fixed; inset: 0; width: 100vw; height: 100vh; z-index: 0; pointer-events: none; }

@media (max-width: 900px) {
  .nav nav { order: 4; width: 100%; margin: 0; }
  .nav ul { overflow-x: auto; justify-content: space-between; }
  .nav ul a { padding: .45rem .45rem; font-size: .9rem; }
  .nav .theme-toggle { margin-left: auto; }
  .services li { grid-template-columns: 1fr; gap: .5rem; }
  .products { grid-template-columns: 1fr; }
  .hero { min-height: 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}