/* arteinde.com — landing transitorio
   Sin dependencias externas: cero webfonts, cero JS, CSP estricta.
   Paleta: carbón + ámbar señal (instrumento de medición sobre negro). */

:root {
  --bg:        #0A0D10;
  --bg-raise:  #11161B;
  --bg-card:   #0E1317;
  --line:      #1E262E;
  --line-soft: #161D24;

  --text:      #E9EEF3;
  --text-mid:  #A8B4BF;
  --text-dim:  #6F7D89;

  --accent:      #F0A03C;
  --accent-soft: #F0A03C1F;
  --accent-line: #F0A03C4D;

  --sans: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --wrap: 1120px;
  --pad: clamp(1.25rem, 5vw, 3rem);
}

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: clamp(1rem, 0.96rem + 0.2vw, 1.0625rem);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .001ms !important; transition-duration: .001ms !important; }
}

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

/* Fondo: retícula técnica muy tenue + halo cálido superior */
.grid-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, #FFFFFF06 1px, transparent 1px),
    linear-gradient(to bottom, #FFFFFF06 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: radial-gradient(120% 80% at 50% 0%, #000 25%, transparent 78%);
  -webkit-mask-image: radial-gradient(120% 80% at 50% 0%, #000 25%, transparent 78%);
}
.grid-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(72% 46% at 50% -8%, #F0A03C14 0%, transparent 68%);
}

header, main, footer { position: relative; z-index: 1; }

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: #0A0D10;
  padding: .7rem 1.1rem;
  font-weight: 600;
  z-index: 99;
}
.skip:focus { left: 1rem; top: 1rem; }

:where(a, button):focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ---------- Header ---------- */

.site-header {
  border-bottom: 1px solid var(--line-soft);
  background: #0A0D10CC;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 68px;
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  color: var(--text);
  text-decoration: none;
}
.wordmark .mark { color: var(--accent); flex: none; }
.wordmark-text {
  font-weight: 600;
  font-size: 1.0625rem;
  letter-spacing: -0.015em;
}

.header-mail {
  font-family: var(--mono);
  font-size: .8125rem;
  color: var(--text-mid);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .18s ease, border-color .18s ease;
}
.header-mail:hover { color: var(--accent); border-bottom-color: var(--accent-line); }

@media (max-width: 480px) { .header-mail { display: none; } }

/* ---------- Hero ---------- */

.hero { padding-block: clamp(4rem, 12vw, 8.5rem) clamp(3rem, 8vw, 5.5rem); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  margin: 0 0 1.75rem;
  font-family: var(--mono);
  font-size: .75rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid var(--accent-line);
  border-radius: 100px;
  padding: .35rem .85rem .35rem .7rem;
}
.tick {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 3px #F0A03C26;
}

.display {
  margin: 0 0 1.5rem;
  font-size: clamp(2.15rem, 1.3rem + 4.1vw, 4.05rem);
  line-height: 1.06;
  letter-spacing: -0.033em;
  font-weight: 600;
  text-wrap: balance;
}

.lede {
  max-width: 62ch;
  margin: 0 0 2.4rem;
  font-size: clamp(1.0625rem, 1rem + 0.35vw, 1.1875rem);
  line-height: 1.72;
  color: var(--text-mid);
  text-align: justify;
  hyphens: auto;
}

.cta-row { display: flex; flex-wrap: wrap; gap: .85rem; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: .82rem 1.6rem;
  border-radius: 3px;
  font-size: .9375rem;
  font-weight: 600;
  letter-spacing: -0.005em;
  text-decoration: none;
  border: 1px solid transparent;
  transition: background-color .18s ease, border-color .18s ease, color .18s ease, transform .18s ease;
}
.btn:active { transform: translateY(1px); }

.btn-primary { background: var(--accent); color: #0A0D10; }
.btn-primary:hover { background: #FFB459; }

.btn-ghost { color: var(--text); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--accent-line); color: var(--accent); }

/* ---------- Secciones ---------- */

.section-title {
  display: flex;
  align-items: baseline;
  gap: .85rem;
  margin: 0 0 2.4rem;
  font-size: clamp(1.35rem, 1.15rem + 0.7vw, 1.75rem);
  font-weight: 600;
  letter-spacing: -0.02em;
}
.section-title .idx {
  font-family: var(--mono);
  font-size: .75rem;
  font-weight: 500;
  letter-spacing: .1em;
  color: var(--accent);
  padding-top: .2rem;
}

.capabilities { padding-block: clamp(3rem, 7vw, 5rem); border-top: 1px solid var(--line-soft); }

/* 4 tarjetas → 2×2 fijo en desktop. Con auto-fit quedaban 3+1 y un hueco muerto
   a la derecha de la segunda fila. Nunca dejar que auto-fit decida con conteo par. */
.cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}
@media (min-width: 700px) {
  .cards { grid-template-columns: repeat(2, 1fr); }
}

.card {
  background: var(--bg-card);
  padding: clamp(1.5rem, 3vw, 2.1rem);
  transition: background-color .2s ease;
}
.card:hover { background: var(--bg-raise); }

.card h3 {
  margin: 0 0 .85rem;
  font-size: 1.0625rem;
  font-weight: 600;
  letter-spacing: -0.012em;
  line-height: 1.35;
  color: var(--text);
}
.card p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.68;
  color: var(--text-mid);
  text-align: justify;
  hyphens: auto;
}

/* ---------- Principios ---------- */

.principles { padding-block: clamp(3rem, 7vw, 5rem); border-top: 1px solid var(--line-soft); }

.principle-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(268px, 1fr));
  gap: clamp(1.75rem, 4vw, 3rem);
}
.principle-list li { border-top: 1px solid var(--accent-line); padding-top: 1.15rem; }

.p-num {
  display: block;
  font-family: var(--mono);
  font-size: .75rem;
  letter-spacing: .1em;
  color: var(--accent);
  margin-bottom: .7rem;
}
.principle-list h3 {
  margin: 0 0 .6rem;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.principle-list p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.68;
  color: var(--text-mid);
  text-align: justify;
  hyphens: auto;
}

/* ---------- Contacto ---------- */

.contact {
  padding-block: clamp(3.5rem, 9vw, 6.5rem);
  border-top: 1px solid var(--line-soft);
  background:
    radial-gradient(80% 120% at 50% 100%, #F0A03C0F 0%, transparent 62%),
    var(--bg);
}
.contact-inner { text-align: center; }

.notice {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  margin: 0 0 1.5rem;
  font-family: var(--mono);
  font-size: .75rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--text-dim);
  border: 1px solid var(--line);
  border-radius: 100px;
  padding: .35rem .9rem .35rem .75rem;
}
.dot {
  width: 6px; height: 6px;
  flex: none;
  border-radius: 50%;
  background: var(--accent);
  animation: pulse 2.6s ease-in-out infinite;
}

/* En móvil el pill se partía en dos líneas y el punto quedaba flotando arriba.
   Achicar tipografía y tracking lo devuelve a una sola línea. */
@media (max-width: 560px) {
  .notice {
    font-size: .6875rem;
    letter-spacing: .04em;
    padding: .35rem .75rem .35rem .65rem;
  }
}
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: .25; } }

.display-sm {
  margin: 0 0 1.25rem;
  font-size: clamp(1.6rem, 1.15rem + 2.1vw, 2.6rem);
  line-height: 1.16;
  letter-spacing: -0.028em;
  font-weight: 600;
  text-wrap: balance;
}

.contact-copy {
  max-width: 56ch;
  margin: 0 auto 2.2rem;
  color: var(--text-mid);
  line-height: 1.72;
  text-align: center;
}

.mail-link {
  display: inline-block;
  font-family: var(--mono);
  font-size: clamp(1.05rem, .95rem + .6vw, 1.4rem);
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid var(--accent-line);
  padding-bottom: .25rem;
  transition: border-color .18s ease, color .18s ease;
}
.mail-link:hover { color: #FFB459; border-bottom-color: #FFB459; }

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--line-soft);
  padding-block: 2.25rem;
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: .75rem 1.5rem;
}
.f-brand {
  margin: 0;
  font-size: .9375rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.f-sub { font-weight: 400; color: var(--text-dim); }
.f-sep { color: var(--line); margin-inline: .5rem; }
.f-meta {
  margin: 0;
  font-family: var(--mono);
  font-size: .75rem;
  color: var(--text-dim);
}
.f-meta a { color: var(--text-dim); text-decoration: none; border-bottom: 1px solid var(--line); }
.f-meta a:hover { color: var(--accent); border-bottom-color: var(--accent-line); }

/* ---------- 404 ---------- */

.error-page {
  min-height: 72vh;
  display: grid;
  place-items: center;
  text-align: center;
  padding-block: 4rem;
}
.error-code {
  font-family: var(--mono);
  font-size: .8125rem;
  letter-spacing: .16em;
  color: var(--accent);
  margin: 0 0 1rem;
}