/* Open Fluent · landing de invitaciones.
   Radios: botones pill (999px), tarjetas 18px, campos 12px. Una sola regla, sin excepciones.
   Acento de acción: teal. El naranja y el dorado solo viven en la marca y en la ilustración. */

:root {
  color-scheme: light dark;

  --teal: #0E9C8C;
  --teal-deep: #0B7D71;
  --orange: #F0813B;
  --gold: #F4B63F;

  --bg: #FAF8F4;
  --surface: #FFFFFF;
  --surface-sunk: #F3EFE8;
  --ink: #1C2024;
  --ink-soft: #4C545C;
  --line: #E2DCD2;

  --action: var(--teal-deep);
  --action-hover: #096A60;
  --on-action: #FFFFFF;
  --focus: #0B7D71;

  --r-card: 18px;
  --r-field: 12px;
  --r-pill: 999px;

  --shadow: 0 1px 2px rgba(28, 32, 36, .05), 0 12px 32px -18px rgba(11, 125, 113, .35);
  --ease: cubic-bezier(.16, 1, .3, 1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14171A;
    --surface: #1C2024;
    --surface-sunk: #22272C;
    --ink: #F2EFE9;
    --ink-soft: #B4BBC2;
    --line: #333A41;

    --action: #2CBFAC;
    --action-hover: #4FD3C1;
    --on-action: #10201E;
    --focus: #4FD3C1;

    --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 14px 34px -20px rgba(0, 0, 0, .8);
  }
}

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

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: 'Plus Jakarta Sans', system-ui, -apple-system, 'Segoe UI', sans-serif;
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { line-height: 1.12; letter-spacing: -.02em; margin: 0 0 .5em; font-weight: 800; }
h1 { font-size: clamp(1.95rem, 4.4vw, 2.9rem); }
h2 { font-size: clamp(1.6rem, 4vw, 2.3rem); }
h3 { font-size: 1.15rem; font-weight: 700; letter-spacing: -.01em; }
p { margin: 0 0 1rem; max-width: 62ch; color: var(--ink-soft); }
.lead { font-size: 1.12rem; color: var(--ink-soft); }
strong { color: var(--ink); font-weight: 700; }

a { color: var(--action); }
a:hover { color: var(--action-hover); }

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
  border-radius: 4px;
}

.wrap { width: 100%; max-width: 1120px; margin-inline: auto; padding-inline: 20px; }

section { padding-block: clamp(3.5rem, 9vw, 6rem); }

/* ---------- barra superior ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  height: 68px;
  display: flex;
  align-items: center;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav .wrap { display: flex; align-items: center; gap: 16px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; color: var(--ink); text-decoration: none; letter-spacing: -.02em; white-space: nowrap; }
.brand img { width: 30px; height: 30px; }
.nav-links { margin-left: auto; display: flex; align-items: center; gap: 18px; font-size: .95rem; }
.nav-links a { color: var(--ink-soft); text-decoration: none; white-space: nowrap; }
.nav-links a:hover { color: var(--ink); }
.nav-links .btn { color: var(--on-action); }
@media (max-width: 720px) {
  .nav-links .hide-sm { display: none; }
}
/* Por debajo de 400 px el nombre no entra junto al botón: queda solo el logo. */
@media (max-width: 400px) {
  .nav .brand { font-size: 0; gap: 0; }
  .nav .brand img { width: 28px; height: 28px; }
  .nav-links { gap: 12px; }
  .nav .btn { padding: 9px 14px; }
}

/* ---------- botones ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 22px;
  border: 1px solid transparent;
  border-radius: var(--r-pill);
  background: var(--action);
  color: var(--on-action);
  font: inherit;
  font-weight: 700;
  font-size: .98rem;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  transition: background .2s var(--ease), transform .12s var(--ease);
}
.btn:hover { background: var(--action-hover); color: var(--on-action); }
.btn:active { transform: translateY(1px); }
.btn[disabled] { opacity: .6; cursor: progress; }
.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}
.btn-ghost:hover { background: var(--surface-sunk); color: var(--ink); }
.nav .btn { padding: 9px 18px; font-size: .9rem; }

/* ---------- hero ---------- */
.hero { padding-top: clamp(2.5rem, 6vw, 4.5rem); }
.hero .wrap {
  display: grid;
  gap: clamp(2rem, 5vw, 3.5rem);
  align-items: center;
  grid-template-columns: 1fr;
}
@media (min-width: 900px) {
  .hero .wrap { grid-template-columns: 1.05fr .95fr; }
}
.hero p { font-size: 1.15rem; max-width: 34ch; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 1.75rem; }

/* ilustración: lenguaje visual de la app, no una captura */
.illo {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  padding: clamp(18px, 4vw, 26px);
  box-shadow: var(--shadow);
  display: grid;
  gap: 12px;
}
.bubble { border-radius: var(--r-card); padding: 13px 16px; font-size: .97rem; line-height: 1.5; max-width: 88%; }
.bubble-you { background: var(--surface-sunk); color: var(--ink); justify-self: end; border-bottom-right-radius: 6px; }
.bubble-tutor { background: color-mix(in srgb, var(--teal) 14%, var(--surface)); color: var(--ink); border-bottom-left-radius: 6px; }
.fix {
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px dashed color-mix(in srgb, var(--teal) 45%, transparent);
  font-size: .88rem;
  color: var(--ink-soft);
}
.fix b { color: var(--ink); }
.badges { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 4px; }
.badge {
  font-size: .82rem;
  font-weight: 700;
  padding: 6px 12px;
  border-radius: var(--r-pill);
  background: color-mix(in srgb, var(--gold) 22%, var(--surface));
  color: var(--ink);
  border: 1px solid color-mix(in srgb, var(--gold) 45%, transparent);
}
.badge-xp { background: color-mix(in srgb, var(--teal) 16%, var(--surface)); border-color: color-mix(in srgb, var(--teal) 40%, transparent); }
.illo-caption { font-size: .82rem; color: var(--ink-soft); margin: 10px 0 0; text-align: center; }

/* ---------- declaración de beta ---------- */
.statement { background: var(--surface-sunk); border-block: 1px solid var(--line); }
.statement p { font-size: clamp(1.15rem, 2.6vw, 1.5rem); line-height: 1.45; color: var(--ink); max-width: 30ch; font-weight: 600; letter-spacing: -.01em; }
.statement .wrap { display: grid; gap: 1.5rem; }
@media (min-width: 860px) { .statement .wrap { grid-template-columns: 1fr 1fr; align-items: start; } }
.statement .note { font-size: 1rem; font-weight: 400; color: var(--ink-soft); max-width: 46ch; }

/* ---------- bento ---------- */
.bento { display: grid; gap: 16px; grid-template-columns: 1fr; margin-top: 2rem; }
@media (min-width: 860px) {
  .bento { grid-template-columns: 1.4fr 1fr 1fr; }
  .cell-wide { grid-column: span 2; }
  .cell-tall { grid-row: span 2; }
}
.cell {
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  padding: clamp(20px, 3vw, 28px);
  background: var(--surface);
}
.cell p { margin-bottom: 0; font-size: .98rem; }
.cell-accent { background: linear-gradient(150deg, color-mix(in srgb, var(--teal) 16%, var(--surface)), var(--surface) 70%); }
.cell-warm { background: linear-gradient(150deg, color-mix(in srgb, var(--orange) 14%, var(--surface)), var(--surface) 70%); }
.memory-list { list-style: none; margin: 16px 0 0; padding: 0; display: grid; gap: 8px; }
.memory-list li {
  background: var(--surface-sunk);
  border-radius: var(--r-field);
  padding: 10px 14px;
  font-size: .92rem;
  color: var(--ink);
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: baseline;
}
.memory-list span { color: var(--ink-soft); font-size: .82rem; white-space: nowrap; }

/* ---------- privacidad ---------- */
.rows { display: grid; gap: 0; margin-top: 2rem; }
.row {
  display: grid;
  gap: 6px 32px;
  padding-block: 22px;
  border-top: 1px solid var(--line);
}
@media (min-width: 800px) { .row { grid-template-columns: 22ch 1fr; align-items: baseline; } }
.row h3 { margin: 0; }
.row p { margin: 0; }

/* ---------- pasos ---------- */
.steps { list-style: none; margin: 2rem 0 0; padding: 0 0 0 26px; border-left: 2px solid color-mix(in srgb, var(--teal) 35%, transparent); display: grid; gap: 28px; }
.steps li { position: relative; }
.steps li::before {
  content: "";
  position: absolute;
  left: -33px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--action);
}
.steps h3 { margin-bottom: 4px; }
.steps p { margin: 0; }

/* ---------- formulario ---------- */
.signup { background: var(--surface-sunk); border-top: 1px solid var(--line); }
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  padding: clamp(22px, 4vw, 38px);
  box-shadow: var(--shadow);
  max-width: 560px;
}
.field { display: grid; gap: 6px; margin-bottom: 18px; }
label { font-weight: 700; font-size: .95rem; }
.hint { font-size: .86rem; color: var(--ink-soft); margin: 0; }
input, textarea {
  font: inherit;
  color: var(--ink);
  background: var(--bg);
  border: 1.5px solid var(--line);
  border-radius: var(--r-field);
  padding: 12px 14px;
  width: 100%;
}
input::placeholder, textarea::placeholder { color: color-mix(in srgb, var(--ink-soft) 85%, transparent); }
input:focus-visible, textarea:focus-visible { outline: 3px solid var(--focus); outline-offset: 1px; border-color: var(--focus); }
textarea { min-height: 86px; resize: vertical; }
.error { color: #B3261E; font-size: .88rem; margin: 0; font-weight: 600; }
@media (prefers-color-scheme: dark) { .error { color: #FFB4AB; } }
[hidden] { display: none !important; }
.form-note { font-size: .88rem; margin: 14px 0 0; }
.ok {
  border: 1.5px solid var(--action);
  background: color-mix(in srgb, var(--teal) 12%, var(--surface));
  border-radius: var(--r-field);
  padding: 16px 18px;
}
.ok p { margin: 0; color: var(--ink); }

/* ---------- pie ---------- */
footer { border-top: 1px solid var(--line); padding-block: 32px; font-size: .92rem; color: var(--ink-soft); }
footer .wrap { display: flex; flex-wrap: wrap; gap: 14px 24px; align-items: center; }
footer .brand { font-size: .95rem; }
footer nav { margin-left: auto; display: flex; gap: 18px; }
footer a { color: var(--ink-soft); text-decoration: none; }
footer a:hover { color: var(--ink); }

/* ---------- entrada suave ---------- */
@media (prefers-reduced-motion: no-preference) {
  .reveal { animation: rise .7s var(--ease) both; }
  .reveal-2 { animation-delay: .08s; }
  @keyframes rise { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }
}

/* ---------- páginas legales ---------- */
.legal { padding-block: clamp(2.5rem, 6vw, 4rem); }
.legal .wrap { max-width: 760px; }
.legal h1 { margin-bottom: .35em; }
.legal .updated { font-size: .92rem; color: var(--ink-soft); margin-bottom: 2.5rem; }
.legal h2 {
  font-size: clamp(1.25rem, 2.6vw, 1.5rem);
  margin-top: 2.75rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--line);
}
.legal h2:first-of-type { border-top: 0; padding-top: 0; }
.legal h3 { margin-top: 1.75rem; font-size: 1.02rem; }
.legal p, .legal li { max-width: 68ch; }
.legal ul { padding-left: 1.1rem; margin: 0 0 1rem; }
.legal li { margin-bottom: .55rem; color: var(--ink-soft); }
.legal li strong { color: var(--ink); }
.legal .callout {
  background: var(--surface);
  border: 1px solid var(--line);
  border-left: 4px solid var(--action);
  border-radius: var(--r-field);
  padding: 18px 20px;
  margin: 1.5rem 0;
}
.legal .callout p { margin: 0; color: var(--ink); }
.back { display: inline-block; margin-top: 3rem; font-weight: 700; text-decoration: none; }

/* enlace a la política desde la portada */
.policy-teaser .wrap { display: grid; gap: 1.25rem; justify-items: start; }