/* =========================================
   SENTTRIA — sitio de empresa
   Estilo editorial: blanco, tipografía, líneas finas.
   Un solo color de acento (el azul del logotipo).
========================================= */

:root {
  color-scheme: light dark; /* el navegador adapta scrollbars y controles al tema */

  --bg: #ffffff;
  --ink: #141414;
  --ink-2: #4b4b4b;
  --muted: #7d7d7d;
  --rule: #e3e3e3;
  --blue: #0a66ff;        /* enlaces y la palabra en cursiva del titular */
  --btn: #0a66ff;         /* fondo del botón */
  --btn-hover: #0050d6;
  --photo-filter: none;

  --serif: "Instrument Serif", Georgia, "Times New Roman", serif;
  --sans: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;

  --wrap: 1180px;
  --gutter: clamp(1.25rem, 4vw, 3rem);
}

/* Tema oscuro: se activa solo cuando el sistema del visitante está en modo oscuro */
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --ink: #f3f4f6;
    --ink-2: #b9bdc7;
    --muted: #8b909b;
    --rule: #272b34;
    --blue: #5b95ff;      /* un azul más claro para que se lea sobre fondo oscuro */
    --btn: #1f6fff;
    --btn-hover: #3b82ff;
    --photo-filter: brightness(0.9); /* baja un poco el brillo de las fotos */
  }
}

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, p, dl, dd, ol { margin: 0; }
ol { padding: 0; list-style: none; }

.wrap {
  width: min(var(--wrap), 100% - 2 * var(--gutter));
  margin-inline: auto;
}

/* Enlaces de texto */
.link {
  text-decoration: underline;
  text-decoration-color: var(--rule);
  text-underline-offset: 0.28em;
  text-decoration-thickness: 1px;
  transition: text-decoration-color 0.15s, color 0.15s;
}
.link:hover { color: var(--blue); text-decoration-color: var(--blue); }
.link.arrow::after { content: " →"; }

/* Botón: un rectángulo azul, sin sombra ni brillo */
.button {
  display: inline-block;
  background: var(--btn);
  color: #fff;
  padding: 0.95rem 1.5rem;
  border-radius: 3px;
  font-weight: 500;
  transition: background 0.15s;
}
.button:hover { background: var(--btn-hover); }

/* =========================================
   CABECERA
========================================= */
.top { border-bottom: 1px solid var(--rule); }
.top-row {
  display: flex; align-items: center; justify-content: space-between;
  gap: 2rem; padding: 1.35rem 0;
}

.brand {
  display: inline-flex; align-items: center; gap: 0.6rem;
  font-weight: 600; font-size: 1.05rem; letter-spacing: -0.01em;
}

.menu { display: flex; gap: 2.25rem; font-size: 0.95rem; color: var(--ink-2); }
.menu a:hover { color: var(--ink); text-decoration: underline; text-underline-offset: 0.3em; }

.top-link { font-size: 0.95rem; font-weight: 500; }
.top-link:hover { color: var(--blue); }

/* =========================================
   PRESENTACIÓN
========================================= */
.hero { padding: clamp(4rem, 10vw, 8rem) 0 clamp(4rem, 8vw, 6.5rem); }

.hero h1 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(3rem, 8.2vw, 7rem);
  line-height: 0.98;
  letter-spacing: -0.015em;
  max-width: 17ch; /* "Convertimos ideas" cabe en la primera línea */
}
.hero h1 em { font-style: italic; color: var(--blue); }

.intro {
  margin-top: 2.5rem;
  max-width: 36rem;
  font-size: 1.2rem;
  line-height: 1.55;
  color: var(--ink-2);
}

.actions {
  margin-top: 2.5rem;
  display: flex; flex-wrap: wrap; align-items: center; gap: 1rem 1.5rem;
}
.or { color: var(--muted); font-size: 0.98rem; }
.or .link { color: var(--ink); }

/* Tres datos cortos bajo la presentación (texto tomado de senttria.com) */
.trust {
  margin-top: 3rem;
  padding: 1.5rem 0 0; /* sin la sangría que el navegador da a las listas */
  border-top: 1px solid var(--rule);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem 2rem;
  max-width: 40rem;
  list-style: none;
}
.trust strong { display: block; font-weight: 600; }
.trust span { color: var(--muted); font-size: 0.92rem; }

/* =========================================
   FOTOS
========================================= */
.hero-photo { margin: clamp(3rem, 6vw, 4.5rem) 0 0; }
.wide-photo { margin: 0 0 clamp(2.5rem, 5vw, 3.5rem); }
.hero-photo img, .wide-photo img {
  width: 100%;
  height: auto; /* anula el atributo height del HTML para que mande aspect-ratio */
  aspect-ratio: 21 / 9;
  object-fit: cover;
  border-radius: 4px;
  background: var(--rule);
  filter: var(--photo-filter);
}

.side-photo {
  margin-top: 2rem;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  border-radius: 4px;
  background: var(--rule);
  filter: var(--photo-filter);
}

/* =========================================
   BLOQUES
========================================= */
.block { border-top: 1px solid var(--rule); padding: clamp(3.5rem, 7vw, 6rem) 0; }

.block-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 2fr);
  gap: 3rem clamp(2rem, 6vw, 6rem);
  align-items: start;
}

.block-head h2, .contact h2 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(2rem, 3.6vw, 2.75rem);
  line-height: 1.05;
  letter-spacing: -0.01em;
}
.block-head p { margin-top: 1rem; color: var(--ink-2); max-width: 26rem; }
.block-head.wide { margin-bottom: 3rem; }
.block-head.wide p { max-width: 40rem; }

@media (min-width: 1025px) {
  .block-grid .block-head { position: sticky; top: 2rem; }
}

/* --- Qué hacemos: filas con línea --- */
.rows { border-top: 1px solid var(--rule); }
.row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.5fr);
  gap: 1rem 2.5rem;
  padding: 1.75rem 0;
  border-bottom: 1px solid var(--rule);
}
.row h3 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 1.7rem;
  line-height: 1.15;
  letter-spacing: -0.01em;
}
.row p { color: var(--ink-2); }

/* --- Tecnología --- */
.tech {
  list-style: none;
  margin-top: 2rem;
  display: flex; flex-wrap: wrap; gap: 0.6rem;
}
.tech li {
  border: 1px solid var(--rule);
  border-radius: 3px;
  padding: 0.5rem 0.9rem;
  font-size: 0.95rem; font-weight: 500;
}

/* --- Nosotros --- */
.big {
  font-size: clamp(1.2rem, 1.9vw, 1.45rem);
  line-height: 1.5;
  letter-spacing: -0.005em;
}
.values {
  list-style: none;
  margin-top: 2.5rem;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 2rem;
}
.values li { border-top: 1px solid var(--ink); padding-top: 1rem; }
.values h3 { font-size: 1.05rem; font-weight: 600; }
.values p { margin-top: 0.5rem; color: var(--ink-2); font-size: 0.98rem; }
#nosotros .link { display: inline-block; margin-top: 2rem; font-weight: 500; }

/* --- Cómo trabajamos --- */
.steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0 2.5rem;
}
.steps li { border-top: 1px solid var(--ink); padding-top: 1.25rem; }
.steps .n {
  display: block;
  font-family: var(--serif);
  font-size: 2.5rem;
  line-height: 1;
  color: var(--blue);
}
.steps h3 { margin-top: 1.5rem; font-size: 1.05rem; font-weight: 600; }
.steps p { margin-top: 0.5rem; color: var(--ink-2); font-size: 0.98rem; }

/* --- Contacto --- */
.contact h2 { font-size: clamp(2.5rem, 5.5vw, 4.5rem); max-width: 14ch; }
.contact > .wrap > p { margin-top: 1.5rem; max-width: 32rem; color: var(--ink-2); font-size: 1.15rem; }

.contact-links {
  margin-top: 3rem;
  display: flex; flex-wrap: wrap; gap: 2rem 5rem;
}
.contact-links a {
  display: grid; gap: 0.35rem;
  font-family: var(--serif);
  font-size: clamp(1.75rem, 3vw, 2.4rem);
  line-height: 1.1;
  letter-spacing: -0.01em;
  transition: color 0.15s;
}
.contact-links a:hover { color: var(--blue); }
.contact-links small {
  font-family: var(--sans);
  font-size: 0.9rem;
  color: var(--muted);
  letter-spacing: 0;
}

/* =========================================
   PIE
========================================= */
.foot { border-top: 1px solid var(--rule); padding: 2rem 0 2.5rem; }
.foot-row {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  gap: 1rem 2rem;
  font-size: 0.92rem; color: var(--muted);
}
.foot .brand { color: var(--ink); font-size: 0.98rem; }

/* =========================================
   BOTÓN FLOTANTE DE WHATSAPP
========================================= */
.wa-float {
  position: fixed; right: 1.25rem; bottom: 1.25rem; z-index: 20;
  display: inline-flex; align-items: center; gap: 0.5rem;
  background: #25d366; color: #fff;
  padding: 0.7rem 1.05rem 0.7rem 0.85rem;
  border-radius: 999px;
  font-weight: 500; font-size: 0.95rem;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.18);
  transition: background 0.15s;
}
.wa-float:hover { background: #1fb85a; }
.wa-float svg { width: 22px; height: 22px; fill: currentColor; }

/* =========================================
   PANTALLAS MEDIANAS Y CELULAR
========================================= */
@media (max-width: 1024px) {
  .block-grid { grid-template-columns: minmax(0, 1fr); gap: 2rem; }
  .side-photo { aspect-ratio: 16 / 9; }
  .hero-photo img, .wide-photo img { aspect-ratio: 16 / 9; }
  .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 2.5rem 2.5rem; }
}

@media (max-width: 720px) {
  .menu { display: none; }
  .hero-photo img, .wide-photo img, .side-photo { aspect-ratio: 4 / 3; }
  .trust { grid-template-columns: minmax(0, 1fr); gap: 0.9rem; }
  .row { grid-template-columns: minmax(0, 1fr); gap: 0.5rem; padding: 1.4rem 0; }
  .steps { grid-template-columns: minmax(0, 1fr); gap: 2rem; }
  .values { grid-template-columns: minmax(0, 1fr); gap: 1.5rem; }
  .contact-links { flex-direction: column; gap: 1.75rem; }
  .foot-row { flex-direction: column; align-items: flex-start; }
}