/* Sintropia · sitio web v3 · sistema "Trazado"
   Layout: retícula de 12 columnas sobre módulo de 8px, máx. 1280px; bandas a todo el ancho
   (Tinta / Mineral / Verde Sistema) unidas por líneas ortogonales. Esquinas rectas. */
:root {
  /* Color: marca */
  --green: #0E4A3B;        /* Verde Sistema · primario */
  --green-600: #135C46;
  --green-500: #1B7357;
  --green-300: #5FAE8E;
  --liquen: #97CBB5;       /* secundario */
  --green-50: #E7F3EE;
  --amber: #FFA41B;        /* Ámbar Señal · acento, ≤5% */
  --amber-700: #A35C00;    /* texto ámbar sobre claro */
  --ink: #0B1110;          /* Tinta · fondo oscuro */
  --ink-2: #121B19;
  --ink-3: #1B2724;
  --ink-line: #2A3834;
  --mineral: #F4F7F5;      /* fondo claro */
  --paper: #FFFFFF;
  --bone: #EEF2F0;
  --n200: #C9D2CE;
  --n300: #A9B5B0;
  --n400: #84928C;
  --n500: #63706B;
  --n600: #4A5652;
  --n100: #E2E8E5;
  --danger: #E5534B;

  /* Tipo */
  --sans: 'Instrument Sans', 'Helvetica Neue', Arial, sans-serif;
  --mono: 'IBM Plex Mono', ui-monospace, 'SFMono-Regular', Menlo, monospace;
  --fs-display: clamp(2.35rem, 1.3rem + 4.6vw, 5rem);
  --fs-h2: clamp(2rem, 1.3rem + 2.6vw, 3.25rem);
  --fs-h3: clamp(1.25rem, 1.1rem + .5vw, 1.5rem);
  --fs-lead: clamp(1.0625rem, 1rem + .3vw, 1.25rem);
  --fs-body: 1rem;
  --fs-small: .875rem;
  --fs-label: .75rem;

  /* Espacio y movimiento */
  --gutter: clamp(16px, 3vw, 32px);
  --max: 1280px;
  --section: clamp(80px, 10vw, 144px);
  --ease: cubic-bezier(.2, 0, 0, 1);
  --t-fast: 120ms;
  --t-base: 240ms;
  --t-slow: 480ms;
  --t-trace: 900ms;

  color-scheme: light;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 88px; }
body {
  margin: 0;
  background: var(--ink);
  color: var(--bone);
  font-family: var(--sans);
  font-size: var(--fs-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}
img, svg { max-width: 100%; }
a { color: inherit; }
::selection { background: var(--amber); color: var(--ink); }
:focus-visible { outline: 2px solid var(--amber); outline-offset: 3px; }
[hidden] { display: none !important; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.skip { position: absolute; left: 16px; top: -100px; z-index: 100; background: var(--amber); color: var(--ink); padding: 10px 16px; font-weight: 600; text-decoration: none; }
.skip:focus { top: 16px; }

/* ---------- Bandas y contenedor ---------- */
.band { position: relative; }
.band--ink { background: var(--ink); color: var(--bone); }
.band--ink2 { background: var(--ink-2); color: var(--bone); }
.band--mineral { background: var(--mineral); color: var(--ink); color-scheme: light; }
.band--paper { background: var(--paper); color: var(--ink); }
.band--green { background: var(--green); color: var(--bone); }
.wrap {
  width: 100%;
  max-width: calc(var(--max) + 2 * var(--gutter));
  margin-inline: auto;
  padding-left: max(var(--gutter), env(safe-area-inset-left, 0px));
  padding-right: max(var(--gutter), env(safe-area-inset-right, 0px));
}
.section { padding-block: var(--section); }
.lattice {
  background-image: radial-gradient(circle at 1px 1px, rgba(238,242,240,.075) 1.2px, transparent 1.6px);
  background-size: 24px 24px;
}
.band--mineral .lattice, .lattice--light {
  background-image: radial-gradient(circle at 1px 1px, rgba(11,17,16,.08) 1.2px, transparent 1.6px);
}

/* ---------- Tipografía ---------- */
.label {
  font-family: var(--mono);
  font-size: var(--fs-label);
  font-weight: 500;
  letter-spacing: .12em;
  text-transform: uppercase;
  line-height: 1.3;
}
.eyebrow { display: inline-flex; align-items: center; gap: 10px; color: var(--amber); }
.band--mineral .eyebrow, .band--paper .eyebrow { color: var(--amber-700); }
.eyebrow::before { content: ""; width: 8px; height: 8px; background: currentColor; flex: none; }
h1, h2, h3, h4 { margin: 0; font-weight: 500; text-wrap: balance; }
.display { font-size: var(--fs-display); line-height: 1.04; letter-spacing: -.035em; }
.h2 { font-size: var(--fs-h2); line-height: 1.08; letter-spacing: -.028em; }
.h3 { font-size: var(--fs-h3); line-height: 1.2; letter-spacing: -.015em; }
.lead { font-size: var(--fs-lead); line-height: 1.55; max-width: 60ch; }
.muted { color: var(--n300); }
.band--mineral .muted, .band--paper .muted { color: var(--n600); }
p { margin: 0; text-wrap: pretty; }
.section-head { display: grid; gap: 20px; max-width: 760px; }
.section-head--split {
  max-width: none;
  grid-template-columns: minmax(0, 1fr);
  align-items: end;
}
@media (min-width: 900px) {
  .section-head--split { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: 48px; }
}

/* ---------- Botones ---------- */
.btn {
  --btn-bg: transparent; --btn-fg: currentColor; --btn-bd: currentColor;
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  min-height: 48px; padding: 12px 22px;
  font: 600 15px/1.2 var(--sans); letter-spacing: 0;
  text-decoration: none; cursor: pointer;
  background: var(--btn-bg); color: var(--btn-fg);
  border: 1px solid var(--btn-bd); border-radius: 0;
  transition: background var(--t-base) var(--ease), color var(--t-base) var(--ease), border-color var(--t-base) var(--ease), transform var(--t-fast) var(--ease);
}
.btn:active { transform: translateY(1px); }
.btn--amber { --btn-bg: var(--amber); --btn-fg: var(--ink); --btn-bd: var(--amber); }
.btn--amber:hover { --btn-bg: #FFB447; --btn-bd: #FFB447; }
.btn--ghost { --btn-bd: var(--ink-line); }
.btn--ghost:hover { --btn-bd: var(--bone); }
.band--mineral .btn--ghost, .band--paper .btn--ghost { --btn-bd: var(--n200); }
.band--mineral .btn--ghost:hover, .band--paper .btn--ghost:hover { --btn-bd: var(--ink); }
.btn--green { --btn-bg: var(--green); --btn-fg: var(--paper); --btn-bd: var(--green); }
.btn--green:hover { --btn-bg: var(--green-600); --btn-bd: var(--green-600); }
.btn .arrow { transition: transform var(--t-base) var(--ease); }
.btn:hover .arrow { transform: translateX(3px); }
.btn[disabled] { opacity: .6; cursor: progress; }

/* ---------- Marca ---------- */
.logo { display: inline-flex; align-items: center; color: inherit; text-decoration: none; }
.logo svg { display: block; height: 26px; width: auto; }

/* ---------- Navegación ---------- */
body::before { content: ""; position: fixed; inset: 0 0 auto; height: env(safe-area-inset-top, 0px); z-index: 60; background: var(--ink); }
.nav {
  position: sticky; top: env(safe-area-inset-top, 0px); z-index: 50;
  background: rgba(11,17,16,.82);
  -webkit-backdrop-filter: saturate(140%) blur(14px);
  backdrop-filter: saturate(140%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--t-base) var(--ease), background var(--t-base) var(--ease);
}
.nav.is-scrolled { border-bottom-color: var(--ink-line); background: rgba(11,17,16,.92); }
.nav__row { display: flex; align-items: center; justify-content: space-between; gap: 24px; min-height: 72px; }
.nav__links { display: none; align-items: center; gap: 32px; list-style: none; margin: 0; padding: 0; }
.nav__links a {
  font-size: 15px; font-weight: 500; color: var(--n300); text-decoration: none;
  transition: color var(--t-fast) var(--ease);
}
.nav__links a:hover, .nav__links a[aria-current="true"] { color: var(--bone); }
.nav__cta { display: none; }
.nav__toggle {
  display: inline-flex; flex-direction: column; justify-content: center; gap: 6px;
  width: 44px; height: 44px; padding: 0 11px;
  background: transparent; border: 1px solid var(--ink-line); color: var(--bone); cursor: pointer;
}
.nav__toggle span { display: block; height: 1.5px; background: currentColor; transition: transform var(--t-base) var(--ease), opacity var(--t-base) var(--ease); }
.nav__toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(3.75px) rotate(45deg); }
.nav__toggle[aria-expanded="true"] span:nth-child(2) { transform: translateY(-3.75px) rotate(-45deg); }
.nav__drawer { border-top: 1px solid var(--ink-line); padding-block: 8px 24px; }
.nav__drawer ul { list-style: none; margin: 0; padding: 0; display: grid; }
.nav__drawer li a { display: flex; justify-content: space-between; padding: 16px 0; border-bottom: 1px solid var(--ink-3); text-decoration: none; font-size: 18px; font-weight: 500; }
.nav__drawer .btn { width: 100%; margin-top: 20px; }
@media (min-width: 960px) {
  .nav__links, .nav__cta { display: flex; }
  .nav__toggle, .nav__drawer { display: none !important; }
}

/* ---------- Formularios ---------- */
.field { display: grid; gap: 8px; min-width: 0; }
.field label { font-family: var(--mono); font-size: 11px; letter-spacing: .12em; text-transform: uppercase; color: var(--n300); }
.input {
  width: 100%; min-height: 50px; padding: 13px 14px;
  font: 400 16px/1.4 var(--sans); color: var(--bone);
  background: var(--ink); border: 1px solid var(--ink-line); border-radius: 0;
  transition: border-color var(--t-fast) var(--ease), background var(--t-fast) var(--ease);
}
.input::placeholder { color: var(--n500); }
.input:hover { border-color: var(--n600); }
.input:focus { outline: none; border-color: var(--amber); background: #0d1513; }
textarea.input { resize: vertical; min-height: 120px; }

/* ---------- Pie ---------- */
.footer { border-top: 1px solid var(--ink-line); }
.footer__grid { display: grid; gap: 40px; grid-template-columns: minmax(0, 1fr); padding-block: 64px 48px; }
@media (min-width: 760px) { .footer__grid { grid-template-columns: minmax(0, 2fr) repeat(2, minmax(0, 1fr)); } }
.footer h4 { font-family: var(--mono); font-size: 11px; letter-spacing: .12em; text-transform: uppercase; color: var(--n400); font-weight: 500; margin-bottom: 16px; }
.footer ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.footer a { color: var(--n200); text-decoration: none; }
.footer a:hover { color: var(--bone); }
.footer__base {
  display: flex; flex-wrap: wrap; gap: 12px 24px; justify-content: space-between;
  padding-block: 24px; border-top: 1px solid var(--ink-3); color: var(--n500);
}

/* ---------- Barra de partners (easter egg) ---------- */
.egg {
  display: block; width: 100%; text-decoration: none;
  background: var(--ink-2); border-top: 1px solid var(--ink-3);
  padding-block: 14px calc(14px + env(safe-area-inset-bottom, 0px));
  color: var(--n500); position: relative; overflow: hidden;
  transition: color var(--t-base) var(--ease);
}
.egg::before { content: ""; position: absolute; inset: 0; background: var(--green); transform: translateY(101%); transition: transform var(--t-slow) var(--ease); }
.egg:hover, .egg:focus-visible { color: var(--bone); }
.egg:hover::before, .egg:focus-visible::before { transform: translateY(0); }
.egg__row { position: relative; display: flex; justify-content: center; align-items: center; gap: 12px; text-align: center; }
.egg__dot { width: 8px; height: 8px; background: var(--n600); flex: none; transition: background var(--t-base) var(--ease); }
.egg:hover .egg__dot, .egg:focus-visible .egg__dot { background: var(--amber); }

/* ---------- Revelado al hacer scroll (visible en reposo) ---------- */
.js .reveal { opacity: 0; transform: translateY(16px); transition: opacity 700ms var(--ease), transform 700ms var(--ease); }
.js .reveal.is-in { opacity: 1; transform: none; }

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