/* ==========================================================================
   Fundación Fósiles de Chile — Hoja de estilos
   Índice: 1 Tokens · 2 Base · 3 Layout · 4 Componentes · 5 Header
           6 Secciones · 7 Footer · 8 Responsive · 9 Accesibilidad
   ========================================================================== */

/* 1 · Tokens ------------------------------------------------------------- */
:root {
  --verde: #28483B;
  --verde-oscuro: #1D2A24;
  --salvia: #D4E0D8;
  --arena: #F6F3EA;
  --arena-clara: #FBF9F3;
  --oceano: #304E65;
  --ocre: #BD8B5D;
  --ocre-claro: #E5C9A8;
  --grafito: #292F2B;
  --texto: #3A423D;
  --texto-suave: #5A625C;
  --linea: #E1DCCB;

  --serif: "Fraunces", Georgia, "Times New Roman", serif;
  --sans: "DM Sans", system-ui, -apple-system, "Segoe UI", sans-serif;

  --seccion: clamp(4rem, 9vw, 7rem);
  --separacion: clamp(2rem, 6vw, 5.5rem);
  --radio: 10px;
  color-scheme: light;
}

/* 2 · Base --------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 6rem; }
body {
  margin: 0;
  font: 400 1.0625rem/1.65 var(--sans);
  color: var(--grafito);
  background: var(--arena);
  overflow-x: hidden;
}
img { display: block; max-width: 100%; height: auto; }
figure { margin: 0; }
a { color: inherit; }
p { margin: 0 0 1em; }
h1, h2, h3 {
  margin: 0 0 .6em;
  font-family: var(--serif);
  font-weight: 600;
  line-height: 1.12;
  letter-spacing: -.01em;
  color: var(--verde);
}
h1 { font-size: clamp(2.4rem, 6vw, 4.4rem); }
h2 { font-size: clamp(1.9rem, 4vw, 2.9rem); margin-bottom: .7em; }
h3 { font-size: 1.4rem; }

/* 3 · Layout ------------------------------------------------------------- */
.wrap { width: min(1180px, 100% - 2.5rem); margin-inline: auto; }
section { padding: var(--seccion) 0; }
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--separacion);
  align-items: center;
}
.copy { max-width: 34rem; }
.copy p { color: var(--texto); }
.copy .small { font-size: .95rem; color: var(--texto-suave); }

/* Marco de fotografía: misma proporción en toda la página */
.frame {
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border-radius: var(--radio);
  background: var(--salvia);
  box-shadow: 0 1px 2px rgba(41, 47, 43, .08), 0 18px 40px -22px rgba(41, 47, 43, .35);
}
.frame img { width: 100%; height: 100%; object-fit: cover; }
.frame.duo { display: grid; grid-template-columns: 1fr 1fr; gap: 4px; background: #fff; }

/* 4 · Componentes -------------------------------------------------------- */
.eyebrow {
  display: flex;
  align-items: center;
  gap: .8rem;
  margin: 0 0 1.1rem;
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--oceano);
}
.eyebrow::before { content: ""; width: 28px; height: 2px; background: var(--ocre); }
.lead { max-width: 32em; font-size: 1.2rem; }

.btns { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 2rem; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  min-height: 52px;
  padding: .7rem 1.2rem;
  border: 2px solid var(--verde);
  border-radius: 999px;
  background: var(--verde);
  color: #fff;
  font: 700 .95rem var(--sans);
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  transition: background .2s, color .2s, border-color .2s;
}
.btn:hover { background: var(--verde-oscuro); border-color: var(--verde-oscuro); }
.btn.light { background: var(--arena); border-color: var(--arena); color: var(--verde); }
.btn.light:hover { background: #fff; border-color: #fff; }
.btn.ghost { background: transparent; border-color: #fff; color: #fff; }
.btn.ghost:hover { background: #fff; color: var(--verde); }

/* Iconos Material Symbols (ocultos hasta que la fuente cargue) */
.ms {
  display: inline-block;
  flex: none;
  width: 1em;
  height: 1em;
  overflow: hidden;
  visibility: hidden;
  font: normal 400 1.3em/1 "Material Symbols Outlined";
  letter-spacing: normal;
  text-transform: none;
  white-space: nowrap;
  direction: ltr;
  -webkit-font-smoothing: antialiased;
}
.icons .ms { visibility: visible; }
.btn .ms { font-size: 22px; }

/* 5 · Header ------------------------------------------------------------- */
header.top {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(246, 243, 234, .96);
  border-bottom: 1px solid var(--linea);
}
.bar { display: flex; align-items: center; justify-content: space-between; gap: 1.5rem; min-height: 84px; }
.brand { display: block; line-height: 0; }
.brand img { width: auto; height: 64px; }
nav { flex: 1; display: flex; justify-content: center; }
nav ul { display: flex; gap: 1.8rem; margin: 0; padding: 0; list-style: none; }
nav a {
  padding: .4rem 0;
  border-bottom: 2px solid transparent;
  font-size: .95rem;
  font-weight: 500;
  text-decoration: none;
  white-space: nowrap;
}
nav a:hover { border-color: var(--ocre-claro); }
nav a.on { border-color: var(--ocre); color: var(--verde); }
.tools { display: flex; align-items: center; flex: none; gap: .8rem; }
.lang { display: flex; gap: .2rem; }
.lang button {
  min-width: 44px;
  min-height: 44px;
  padding: .55rem .5rem;
  border: 0;
  border-radius: 6px;
  background: none;
  color: #5B645E;
  font: 700 .9rem var(--sans);
  cursor: pointer;
}
.lang button[aria-pressed="true"] {
  color: var(--verde);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 5px;
}
.menu {
  display: none;
  align-items: center;
  justify-content: center;
  gap: .4rem;
  min-width: 44px;
  min-height: 44px;
  padding: 0 .8rem;
  border: 1px solid var(--verde);
  border-radius: 8px;
  background: none;
  color: var(--verde);
  font: 700 .9rem var(--sans);
  cursor: pointer;
}

/* 6 · Secciones ---------------------------------------------------------- */
/* Hero */
.hero {
  position: relative;
  isolation: isolate;
  display: flex;
  align-items: center;
  min-height: clamp(540px, 82vh, 760px);
  padding: var(--seccion) 0;
  overflow: hidden;
  background: var(--verde-oscuro);
  color: #fff;
}
.hero-bg { position: absolute; inset: 0; z-index: -2; width: 100%; height: 100%; object-fit: cover; object-position: 50% 40%; filter: brightness(1.08) saturate(1.06); }
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(90deg, rgba(18, 34, 28, .80) 0%, rgba(18, 34, 28, .55) 38%, rgba(18, 34, 28, .10) 62%, rgba(18, 34, 28, 0) 78%);
}
.hero .in { max-width: 34rem; }
.hero h1 { margin-bottom: .5em; color: #fff; }
.hero .eyebrow { color: var(--ocre-claro); }
.hero .lead { color: #EEF3EE; }

/* Museo · Playa · La fundación */
#museo, #fundacion { background: var(--arena-clara); }
#playa { background: var(--arena); }
.head { max-width: 40rem; margin-bottom: clamp(2rem, 4vw, 3.2rem); }
.pillars { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(1.2rem, 3vw, 2.2rem); }
.pillar { display: flex; flex-direction: column; overflow: hidden; border: 1px solid #E6E1D0; border-radius: 12px; background: #fff; }
.pillar .art { display: grid; place-items: center; height: 210px; background: var(--t); }
.pillar .art svg { width: 170px; height: 170px; }
.pillar .txt { padding: 1.6rem 1.8rem 2rem; }
.pillar h3 { margin-bottom: .6rem; }
.pillar p { margin: 0; color: var(--texto); }

/* Colabora */
#colabora { position: relative; isolation: isolate; overflow: hidden; background: var(--verde); color: #EEF3EE; }
#colabora .wrap { position: relative; z-index: 1; }
#colabora h2 { color: #fff; }
#colabora .eyebrow { color: var(--ocre-claro); }
#colabora .copy p { color: #E3EBE5; }
#colabora .frame { box-shadow: none; }
.fossil-bg {
  position: absolute;
  top: 0;
  right: 0;
  z-index: -1;
  width: 62%;
  height: 100%;
  object-fit: cover;
  object-position: 35% 50%;
  opacity: .3;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(90deg, transparent 0%, #000 55%);
  mask-image: linear-gradient(90deg, transparent 0%, #000 55%);
}

/* 7 · Footer ------------------------------------------------------------- */
footer { padding: 3.2rem 0 1.6rem; background: var(--verde-oscuro); color: #CFD8D2; font-size: .94rem; }
.fg { display: grid; grid-template-columns: 1.2fr .8fr 1.7fr auto; gap: 2.5rem; align-items: start; }
footer .brand img { height: 72px; }
footer h2 { margin: 0 0 1rem; font: 700 .78rem var(--sans); letter-spacing: .14em; text-transform: uppercase; color: var(--ocre-claro); }
footer ul { display: grid; gap: .6rem; margin: 0; padding: 0; list-style: none; }
footer a { text-underline-offset: 3px; }
.ct li { display: flex; align-items: flex-start; gap: .7rem; }
.ct .ms { margin-top: .1rem; font-size: 22px; color: var(--ocre-claro); }
.side { display: grid; justify-items: start; gap: 1.4rem; }
footer .lang button { color: #CFD8D2; }
footer .lang button[aria-pressed="true"] { color: #fff; }
.legal { margin-top: 2.4rem; padding-top: 1.2rem; border-top: 1px solid rgba(255, 255, 255, .12); font-size: .85rem; color: #9FB0A6; }
.legal p { margin: 0; }

/* Modal · Información de visita */
.btn.outline { background: transparent; color: var(--verde); }
.btn.outline:hover { background: var(--verde); color: #fff; }
.modal {
  width: min(700px, calc(100% - 2rem));
  max-height: calc(100% - 2rem);
  padding: 0;
  overflow: hidden;
  border: 0;
  border-radius: 16px;
  background: #fff;
  color: var(--grafito);
  box-shadow: 0 30px 80px -20px rgba(0, 0, 0, .45);
}
.modal[open] { display: flex; flex-direction: column; }
.modal::backdrop { background: rgba(18, 34, 28, .62); }
body:has(.modal[open]) { overflow: hidden; }
.modal-head { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: 1.1rem 1.2rem 1.1rem 1.6rem; border-bottom: 1px solid var(--linea); }
.modal-head h2 { margin: 0; font-size: 1.5rem; }
.modal-close { display: grid; place-items: center; width: 44px; height: 44px; border: 0; border-radius: 50%; background: var(--arena); color: var(--verde); cursor: pointer; }
.modal-close:hover { background: var(--salvia); }
.modal-close .ms { font-size: 24px; }
.modal-body { display: grid; gap: 1.6rem; flex: 1; padding: 1.5rem 1.6rem; overflow-y: auto; }
.info { display: grid; grid-template-columns: 44px 1fr; gap: 1rem; }
.info > .ms { display: grid; place-items: center; width: 44px; height: 44px; border-radius: 50%; background: var(--salvia); color: var(--verde); font-size: 24px; }
.info h3 { margin: 0 0 .5rem; font-size: 1.15rem; }
.info p { margin: 0 0 .6rem; font-size: .97rem; color: var(--texto); }
.info .nota { margin: .6rem 0 0; font-size: .9rem; color: var(--texto-suave); }
.rows { display: grid; gap: .55rem; margin: 0; padding: 0; list-style: none; }
.rows li { display: flex; justify-content: space-between; gap: 1rem; padding-bottom: .55rem; border-bottom: 1px dashed var(--linea); font-size: .97rem; }
.rows span { color: var(--texto-suave); }
.rows strong { text-align: right; font-weight: 700; color: var(--grafito); }
.link { display: inline-flex; align-items: center; gap: .3rem; font-weight: 700; color: var(--verde); text-underline-offset: 3px; }
.link .ms { font-size: 18px; }
.modal-foot { padding: 1.1rem 1.6rem 1.4rem; border-top: 1px solid var(--linea); background: var(--arena-clara); }
.modal-foot p { margin: 0 0 .9rem; font-size: .92rem; color: var(--texto-suave); }
.modal-foot .btns { margin: 0; }

/* 8 · Responsive --------------------------------------------------------- */
@media (max-width: 1100px) {
  .menu { display: inline-flex; }
  .cta-top { display: none; }
  nav { position: absolute; top: 100%; left: 0; right: 0; display: none; background: var(--arena); border-bottom: 1px solid var(--linea); }
  nav.open { display: block; }
  nav ul { flex-direction: column; gap: 0; padding: .5rem 1.25rem 1rem; }
  nav a { display: block; padding: .8rem 0 .8rem .8rem; border-bottom: 0; border-left: 3px solid transparent; }
  nav a.on { border-left-color: var(--ocre); font-weight: 700; }
}
@media (max-width: 900px) {
  .split { grid-template-columns: 1fr; gap: 2rem; }
  .pillars { grid-template-columns: 1fr; }
  .hero::after { background: linear-gradient(180deg, rgba(18, 34, 28, .55) 0%, rgba(18, 34, 28, .82) 100%); }
  .hero-bg { object-position: 38% 40%; }
  .fossil-bg {
    top: auto;
    bottom: 0;
    width: 100%;
    height: 55%;
    opacity: .2;
    -webkit-mask-image: linear-gradient(0deg, #000 0%, transparent 100%);
    mask-image: linear-gradient(0deg, #000 0%, transparent 100%);
  }
  .fg { grid-template-columns: 1fr 1fr; gap: 2rem; }
}
@media (max-width: 640px) {
  .modal { width: 100%; max-width: none; max-height: 92dvh; margin: auto 0 0; border-radius: 16px 16px 0 0; }
  .modal-foot .btn { width: 100%; justify-content: center; }
}
@media (max-width: 520px) {
  .bar { gap: .4rem; }
  .brand img { height: 48px; }
  .lang button { min-width: 40px; padding: .55rem .35rem; }
  .btn { width: 100%; justify-content: center; }
  .fg { grid-template-columns: 1fr; }
}

/* 9 · Accesibilidad ------------------------------------------------------ */
:focus-visible { outline: 3px solid var(--ocre); outline-offset: 3px; border-radius: 4px; }
.skip { position: absolute; top: 0; left: -999px; z-index: 100; padding: .7rem 1rem; background: var(--verde); color: #fff; }
.skip:focus { left: 0; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}