/* ===========================================================
   SEMBRILA — Landing page
   Solo HTML + CSS + JS. Sin frameworks.
   =========================================================== */

:root {
  /* Paleta educativa, confiable y moderna */
  --green-900: #0f3d2e;
  --green-700: #1f7a5a;
  --green-600: #259d72;
  --green-100: #e7f5ee;
  --blue-600:  #2563eb;
  --ink:       #14241d;
  --slate:     #4b5a54;
  --muted:     #6b7b74;
  --bg:        #ffffff;
  --bg-soft:   #f4f9f6;
  --line:      #e3ece8;
  --white:     #ffffff;

  --radius:    18px;
  --radius-sm: 12px;
  --shadow:    0 10px 30px -12px rgba(15, 61, 46, .18);
  --shadow-lg: 0 24px 60px -20px rgba(15, 61, 46, .28);

  --maxw: 1140px;
  --font-sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-display: "Fraunces", Georgia, "Times New Roman", serif;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { margin: 0; padding: 0; list-style: none; }
h1, h2, h3 { margin: 0; line-height: 1.15; font-weight: 600; letter-spacing: -.01em; }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 22px; }

/* ---------- Buttons ---------- */
.btn {
  --pad-y: 14px; --pad-x: 26px;
  display: inline-flex; align-items: center; justify-content: center; gap: .5em;
  padding: var(--pad-y) var(--pad-x);
  border: 1px solid transparent;
  border-radius: 999px;
  font-weight: 600; font-size: 1rem; cursor: pointer;
  transition: transform .18s ease, box-shadow .2s ease, background .2s ease, color .2s ease;
  white-space: nowrap;
}
.btn--primary {
  background: var(--green-700); color: #fff;
  box-shadow: 0 8px 22px -8px rgba(31,122,90,.6);
}
.btn--primary:hover { background: var(--green-600); transform: translateY(-2px); box-shadow: 0 14px 28px -10px rgba(31,122,90,.6); }
.btn--ghost { background: transparent; border-color: var(--line); color: var(--ink); }
.btn--ghost:hover { border-color: var(--green-600); color: var(--green-700); }
.btn--text { background: transparent; color: var(--green-700); padding-left: 8px; padding-right: 8px; }
.btn--text:hover { color: var(--green-900); }
.btn--block { width: 100%; }

/* ---------- Brand ---------- */
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 700; }
.brand__mark {
  display: grid; place-items: center;
  width: 38px; height: 38px; border-radius: 11px;
  background: var(--green-100); color: var(--green-700);
}
.brand__name { font-family: var(--font-display); font-size: 1.15rem; letter-spacing: .04em; }

/* ---------- Nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.82);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav__inner { display: flex; align-items: center; justify-content: space-between; height: 70px; gap: 18px; }
.nav__links { display: flex; gap: 28px; }
.nav__links a { color: var(--slate); font-weight: 500; font-size: .98rem; transition: color .18s; }
.nav__links a:hover { color: var(--green-700); }
.nav__cta { --pad-y: 9px; --pad-x: 18px; font-size: .95rem; }

.nav__toggle {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: 0; cursor: pointer; padding: 8px;
}
.nav__toggle span { width: 24px; height: 2px; background: var(--ink); border-radius: 2px; transition: transform .25s, opacity .25s; }
.nav__toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav__toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.nav__mobile { display: none; flex-direction: column; padding: 8px 22px 18px; border-bottom: 1px solid var(--line); background: #fff; }
.nav__mobile a { padding: 12px 4px; color: var(--slate); font-weight: 500; border-bottom: 1px solid var(--line); }
.nav__mobile a:last-child { border-bottom: 0; }

/* ---------- Hero ---------- */
.hero { position: relative; overflow: hidden; background: linear-gradient(180deg, var(--bg-soft), #fff); }
.hero__glow {
  position: absolute; inset: -30% 0 auto 0; height: 520px;
  background:
    radial-gradient(420px 260px at 22% 18%, rgba(37,157,114,.20), transparent 70%),
    radial-gradient(460px 300px at 82% 8%, rgba(37,99,235,.16), transparent 70%);
  pointer-events: none;
}
.hero__inner { position: relative; text-align: center; padding: 96px 0 88px; }
.hero__eyebrow {
  display: inline-block; margin: 0 0 18px;
  font-size: .82rem; font-weight: 600; letter-spacing: .14em; text-transform: uppercase;
  color: var(--green-700);
  background: var(--green-100); padding: 7px 16px; border-radius: 999px;
}
.hero__title {
  font-family: var(--font-display);
  font-size: clamp(3.2rem, 11vw, 7rem);
  font-weight: 700; letter-spacing: .02em;
  background: linear-gradient(120deg, var(--green-900), var(--green-600) 60%, var(--blue-600));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero__subtitle {
  margin: 14px auto 0; max-width: 620px;
  font-size: clamp(1.15rem, 3.5vw, 1.5rem); color: var(--slate); font-weight: 500;
}
.hero__actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; margin-top: 34px; }

.hero__stats { display: flex; justify-content: center; gap: 18px; flex-wrap: wrap; margin-top: 56px; }
.stat {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px 26px; min-width: 150px; box-shadow: var(--shadow);
}
.stat__num { display: block; font-family: var(--font-display); font-size: 1.9rem; font-weight: 700; color: var(--green-700); }
.stat__label { font-size: .9rem; color: var(--muted); }

/* ---------- Sections ---------- */
.section { padding: 92px 0; }
.section--alt { background: var(--bg-soft); }
.kicker {
  display: inline-block; margin-bottom: 14px;
  font-size: .8rem; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; color: var(--green-600);
}
.section__head h2 { font-size: clamp(1.7rem, 4.5vw, 2.6rem); color: var(--ink); }
.section__head--center { text-align: center; max-width: 720px; margin: 0 auto 52px; }
.lead { color: var(--slate); font-size: 1.08rem; margin-top: 16px; }
.lead--center { margin-left: auto; margin-right: auto; }

.section__grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: center; }

.checklist { margin-top: 22px; display: grid; gap: 12px; }
.checklist li { position: relative; padding-left: 32px; color: var(--slate); }
.checklist li::before {
  content: "✓"; position: absolute; left: 0; top: 0;
  width: 22px; height: 22px; display: grid; place-items: center;
  background: var(--green-100); color: var(--green-700); border-radius: 50%; font-size: .8rem; font-weight: 700;
}

.section__cards { display: grid; gap: 16px; }
.mini-card {
  display: grid; grid-template-columns: auto 1fr; column-gap: 16px; row-gap: 4px; align-items: start;
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px 24px; box-shadow: var(--shadow);
  transition: transform .2s ease, box-shadow .2s ease;
}
.mini-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.mini-card__icon { grid-row: 1 / span 2; font-size: 1.7rem; }
.mini-card h3 { font-size: 1.1rem; }
.mini-card p { margin: 0; color: var(--muted); font-size: .96rem; }

/* ---------- Áreas ---------- */
.areas { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.area-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 30px 24px; text-align: left; position: relative; overflow: hidden;
  box-shadow: var(--shadow); transition: transform .2s ease, box-shadow .2s ease;
}
.area-card::before {
  content: ""; position: absolute; left: 0; top: 0; height: 4px; width: 100%;
  background: var(--accent, var(--green-600));
}
.area-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.area-card__icon {
  display: grid; place-items: center; width: 54px; height: 54px; border-radius: 14px;
  font-size: 1.6rem; margin-bottom: 18px;
  background: color-mix(in srgb, var(--accent) 14%, white);
}
.area-card h3 { font-size: 1.2rem; margin-bottom: 8px; }
.area-card p { margin: 0; color: var(--muted); font-size: .95rem; }

/* ---------- Público ---------- */
.audience { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.audience-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 30px; box-shadow: var(--shadow); transition: transform .2s ease, box-shadow .2s ease;
}
.audience-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); }
.audience-card__top { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.audience-card__top span { font-size: 2rem; }
.audience-card h3 { font-size: 1.25rem; }
.audience-card p { margin: 0; color: var(--slate); }

/* ---------- Contacto ---------- */
.contact { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.contact__points { margin-top: 22px; display: grid; gap: 10px; color: var(--slate); }
.form {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 30px; box-shadow: var(--shadow-lg);
}
.field { margin-bottom: 18px; }
.field label { display: block; font-size: .9rem; font-weight: 600; margin-bottom: 7px; color: var(--ink); }
.field input, .field select, .field textarea {
  width: 100%; padding: 13px 15px; font: inherit; color: var(--ink);
  background: var(--bg-soft); border: 1px solid var(--line); border-radius: var(--radius-sm);
  transition: border-color .18s, box-shadow .18s, background .18s;
}
.field textarea { resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; border-color: var(--green-600); background: #fff;
  box-shadow: 0 0 0 4px rgba(37,157,114,.14);
}
.form__note { margin: 14px 0 0; font-size: .95rem; font-weight: 600; min-height: 1.2em; }
.form__note.is-ok { color: var(--green-700); }
.form__note.is-err { color: #c0392b; }

/* ---------- Footer ---------- */
.footer { background: var(--green-900); color: #d7e7df; padding: 54px 0 30px; }
.footer__inner { display: grid; justify-items: center; text-align: center; gap: 14px; }
.footer .brand__mark { background: rgba(255,255,255,.12); color: #fff; }
.footer .brand__name { color: #fff; }
.footer__tag { margin: 0; color: #a9c6ba; font-size: 1rem; }
.footer__links { display: flex; gap: 22px; flex-wrap: wrap; justify-content: center; }
.footer__links a { color: #bcd5cb; font-size: .95rem; transition: color .18s; }
.footer__links a:hover { color: #fff; }
.footer__copy { margin: 8px 0 0; font-size: .9rem; color: #7fa193; }

/* ---------- Animaciones de aparición ---------- */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .6s ease, transform .6s ease; }
.reveal.is-visible { opacity: 1; transform: none; }

/* ---------- Responsive ---------- */
@media (max-width: 920px) {
  .section__grid { grid-template-columns: 1fr; gap: 36px; }
  .areas { grid-template-columns: repeat(2, 1fr); }
  .audience { grid-template-columns: 1fr; }
  .contact { grid-template-columns: 1fr; gap: 34px; }
}
@media (max-width: 680px) {
  body { font-size: 16px; }
  .nav__links, .nav__cta { display: none; }
  .nav__toggle { display: flex; }
  .nav__mobile[data-open="true"] { display: flex; }
  .section { padding: 68px 0; }
  .hero__inner { padding: 70px 0 64px; }
  .hero__stats { gap: 12px; }
  .stat { min-width: 132px; padding: 14px 18px; }
}
@media (max-width: 430px) {
  .areas { grid-template-columns: 1fr; }
  .hero__actions .btn { width: 100%; }
}

/* ---------- Accesibilidad: respeta reduce-motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .btn, .area-card, .mini-card, .audience-card { transition: none; }
}