/*
 * La web pública de Kalman. Los mismos colores que la aplicación
 * (kalman/web/theme.py): negro y blanco, y el azul del reactor solo para lo
 * que importa.
 */
:root {
  --bg: #FFFFFF;
  --surface: #F7F7F8;
  --border: #E4E4E7;
  --border-strong: #D4D4D8;
  --ink: #0D0D0D;
  --muted: #63636E;
  --accent: #0D0D0D;
  --on-accent: #FFFFFF;
  --glow: #0369A1;
  --glow-soft: #E0F2FE;
  --ok: #15803D;
  --ok-soft: #DCFCE7;
  --bad: #B91C1C;
  --bad-soft: #FEE2E2;
  --radio: 14px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0A0A0A;
    --surface: #151515;
    --border: #282828;
    --border-strong: #3A3A3A;
    --ink: #FFFFFF;
    --muted: #9A9AA5;
    --accent: #FFFFFF;
    --on-accent: #0A0A0A;
    --glow: #38BDF8;
    --glow-soft: #0A2230;
    --ok: #4ADE80;
    --ok-soft: #0B2A17;
    --bad: #F87171;
    --bad-soft: #2E1111;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  background-image: radial-gradient(60rem 30rem at 85% -10%, var(--glow-soft), transparent 70%);
  background-repeat: no-repeat;
  color: var(--ink);
  font-family: Inter, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

h1, h2, h3 { line-height: 1.15; margin: 0 0 .6em; }
h1 { font-size: clamp(2.1rem, 5vw, 3.4rem); letter-spacing: -.035em; font-weight: 700; }
h2 { font-size: clamp(1.5rem, 3vw, 2rem); letter-spacing: -.025em; font-weight: 650; }
h3 { font-size: 1.05rem; letter-spacing: -.01em; font-weight: 600; }

.cont { width: 100%; max-width: 1120px; margin: 0 auto; padding: 0 20px; }
.estrecho { max-width: 760px; }

.tenue { color: var(--muted); }
.rojo { color: var(--bad); }
.nota { color: var(--muted); font-size: .88rem; margin-top: 14px; }
.entradilla { color: var(--muted); font-size: 1.12rem; max-width: 62ch; }

/* ----------------------------------------------------------- cabecera */
.cab {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.cab-fila { display: flex; align-items: center; gap: 24px; height: 64px; }
.marca { display: inline-flex; align-items: center; gap: 9px; font-weight: 650; text-decoration: none; letter-spacing: -.02em; }
.menu { display: flex; gap: 22px; margin-left: 12px; }
.menu a, .enlace-sutil { color: var(--muted); text-decoration: none; font-size: .93rem; }
.menu a:hover, .enlace-sutil:hover { color: var(--ink); }
.cab-acciones { margin-left: auto; display: flex; align-items: center; gap: 16px; }

/* ------------------------------------------------------------- botones */
.botones { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 26px; }
.centrados { justify-content: center; }
.boton {
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 999px; padding: 12px 22px; font-weight: 550; font-size: .95rem;
  text-decoration: none; border: 1px solid transparent; cursor: pointer;
  font-family: inherit; transition: box-shadow .15s ease, border-color .15s ease, opacity .15s ease;
}
.boton-peq { padding: 8px 16px; font-size: .88rem; }
.boton-principal { background: var(--accent); color: var(--on-accent); }
.boton-principal:hover { box-shadow: 0 0 28px -4px color-mix(in srgb, var(--glow) 75%, transparent); }
.boton-sec { background: transparent; color: var(--ink); border-color: var(--border-strong); }
.boton-sec:hover { border-color: var(--glow); }
.boton:focus-visible, input:focus-visible, textarea:focus-visible, summary:focus-visible {
  outline: 2px solid var(--glow); outline-offset: 2px;
}

/* --------------------------------------------------------------- héroe */
.heroe { padding: 88px 0 56px; }
.heroe-herramienta { padding: 64px 0 24px; }
.heroe-rejilla { display: grid; grid-template-columns: 1.1fr 1fr; gap: 56px; align-items: center; }
.estado {
  display: inline-flex; align-items: center; gap: 9px;
  font-size: .78rem; letter-spacing: .06em; text-transform: uppercase; color: var(--muted);
  border: 1px solid var(--border); border-radius: 999px; padding: 6px 13px; margin: 0 0 22px;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}
.punto {
  width: 7px; height: 7px; border-radius: 50%; background: var(--glow);
  box-shadow: 0 0 10px var(--glow); animation: latido 2.4s ease-in-out infinite;
}
.brillo { color: var(--glow); text-shadow: 0 0 40px color-mix(in srgb, var(--glow) 45%, transparent); }

/* El escáner: una tabla que se revisa sola. */
.escaner {
  position: relative; overflow: hidden;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radio);
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; font-size: .8rem;
  box-shadow: 0 30px 80px -40px color-mix(in srgb, var(--glow) 60%, transparent);
}
.escaner-cab, .escaner-pie { display: flex; justify-content: space-between; gap: 12px; padding: 12px 16px; }
.escaner-cab { border-bottom: 1px solid var(--border); }
.escaner-pie { border-top: 1px solid var(--border); flex-wrap: wrap; font-weight: 600; }
.etiqueta-ejemplo { font-size: .7rem; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); }
.fila {
  display: grid; grid-template-columns: 1fr 2.2fr 48px; gap: 12px; align-items: center;
  padding: 9px 16px; border-bottom: 1px solid var(--border); white-space: nowrap;
}
.fila span { overflow: hidden; text-overflow: ellipsis; }
.fila i { font-style: normal; text-align: right; font-size: .72rem; font-weight: 600; color: var(--ok); }
.fila.mal { animation: marcar 6s ease-in-out infinite; }
.fila.mal i { color: var(--bad); }
.fila.mal:nth-of-type(4) { animation-delay: 1s; }
.fila.mal:nth-of-type(7) { animation-delay: 2s; }
.barrido {
  position: absolute; left: 0; right: 0; top: 44px; height: 38px; pointer-events: none;
  background: linear-gradient(180deg, transparent, color-mix(in srgb, var(--glow) 22%, transparent), transparent);
  animation: barrer 3s linear infinite;
}

/* ------------------------------------------------------------ secciones */
.seccion { padding: 64px 0; }
.rejilla-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 28px; }
.tarjeta {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radio);
  padding: 22px;
}
.tarjeta p { margin: 0; }
.privacidad {
  margin-top: 16px; padding: 22px; border-radius: var(--radio);
  border: 1px solid color-mix(in srgb, var(--glow) 40%, var(--border));
  background: var(--glow-soft);
}
.privacidad p { margin: 0; }

.pasos { list-style: none; padding: 0; margin: 28px 0 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; counter-reset: paso; }
.pasos li {
  counter-increment: paso; display: flex; flex-direction: column; gap: 6px;
  padding: 22px; border-radius: var(--radio); border: 1px solid var(--border);
}
.pasos li::before {
  content: counter(paso); font-family: ui-monospace, Menlo, Consolas, monospace;
  color: var(--glow); font-weight: 700; font-size: 1.1rem;
}

/* --------------------------------------------------------------- planes */
.planes { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-top: 28px; align-items: stretch; }
.plan {
  position: relative; display: flex; flex-direction: column;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radio); padding: 24px;
}
.plan ul { padding-left: 18px; margin: 14px 0 22px; color: var(--muted); font-size: .92rem; flex: 1; }
.plan li { margin-bottom: 6px; }
.plan .boton { width: 100%; }
.plan-precio { font-size: 1.9rem; font-weight: 700; letter-spacing: -.03em; margin: 0; }
.plan-anual { font-size: .8rem; color: var(--muted); margin: 2px 0 12px; }
.plan-destacado {
  border-color: color-mix(in srgb, var(--glow) 55%, var(--border));
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--glow) 25%, transparent), 0 24px 60px -30px var(--glow);
}
.insignia {
  position: absolute; top: -11px; left: 24px;
  background: var(--glow); color: var(--bg); font-size: .7rem; font-weight: 700;
  letter-spacing: .06em; text-transform: uppercase; padding: 3px 10px; border-radius: 999px;
}
.fundador { text-align: center; }

/* ------------------------------------------------------------- preguntas */
.preguntas details {
  border-bottom: 1px solid var(--border); padding: 16px 0;
}
.preguntas summary { cursor: pointer; font-weight: 600; list-style: none; }
.preguntas summary::-webkit-details-marker { display: none; }
.preguntas summary::after { content: "+"; float: right; color: var(--muted); }
.preguntas details[open] summary::after { content: "–"; }
.preguntas p { color: var(--muted); margin: 10px 0 0; }

.final { text-align: center; }
.final .entradilla { margin: 0 auto; }

/* ---------------------------------------------------------- herramientas */
.herramienta, .herramienta-lista {
  margin-top: 28px; display: flex; flex-direction: column; gap: 10px;
}
.herramienta label, .herramienta-lista label { font-weight: 600; font-size: .92rem; }
.herramienta-fila { display: flex; gap: 10px; }
input[type="text"], textarea {
  flex: 1; width: 100%; font: inherit; font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 1.05rem; color: var(--ink); background: var(--surface);
  border: 1px solid var(--border-strong); border-radius: 12px; padding: 13px 16px;
}
textarea { font-size: .92rem; resize: vertical; }
.herramienta-lista .boton { align-self: flex-start; }
.veredicto {
  display: flex; flex-direction: column; gap: 3px; padding: 16px 18px;
  border-radius: 12px; border: 1px solid; animation: aparecer .25s ease-out;
}
.veredicto span { font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; font-size: .9rem; }
.veredicto .tenue { font-family: inherit; }
.veredicto.bien { background: var(--ok-soft); border-color: color-mix(in srgb, var(--ok) 45%, transparent); }
.veredicto.bien strong { color: var(--ok); }
.veredicto.mal { background: var(--bad-soft); border-color: color-mix(in srgb, var(--bad) 45%, transparent); }
.veredicto.mal strong { color: var(--bad); }
.lista { margin-top: 22px; border: 1px solid var(--border); border-radius: var(--radio); padding: 14px 18px; }
.lista summary { cursor: pointer; font-weight: 600; }
.recuento { margin: 6px 0; }
.gancho {
  text-align: left; padding: 32px; border-radius: var(--radio);
  border: 1px solid color-mix(in srgb, var(--glow) 40%, var(--border)); background: var(--surface);
}

/* --------------------------------------------------------- texto largo */
.texto-largo p, .texto-largo li { color: var(--muted); }
.texto-largo h2 { margin-top: 1.4em; }
.texto-largo h3 { margin-top: 1.6em; }
.legal h1 { font-size: 2rem; }
.tabla-letras { display: grid; grid-template-columns: repeat(auto-fill, minmax(46px, 1fr)); gap: 6px; margin: 16px 0; }
.tabla-letras span {
  display: flex; flex-direction: column; align-items: center; padding: 6px 0;
  border: 1px solid var(--border); border-radius: 8px; font-weight: 700;
  font-family: ui-monospace, Menlo, Consolas, monospace;
}
.tabla-letras b { font-weight: 400; font-size: .7rem; color: var(--muted); }
.tabla { overflow-x: auto; margin: 12px 0; }
table { border-collapse: collapse; width: 100%; font-size: .9rem; }
th, td { text-align: left; padding: 9px 10px; border-bottom: 1px solid var(--border); vertical-align: top; }
th { font-weight: 600; }

/* ------------------------------------------------------------------ pie */
.pie { border-top: 1px solid var(--border); padding: 40px 0 56px; margin-top: 40px; }
.pie-fila { display: flex; justify-content: space-between; gap: 32px; flex-wrap: wrap; }
.pie-enlaces { display: grid; grid-template-columns: repeat(2, auto); gap: 8px 32px; font-size: .9rem; }
.pie-enlaces a { color: var(--muted); text-decoration: none; }
.pie-enlaces a:hover { color: var(--ink); }

/* ---------------------------------------------------------- movimiento */
@keyframes latido { 0%, 100% { opacity: 1; } 50% { opacity: .35; } }
@keyframes barrer { from { transform: translateY(0); } to { transform: translateY(240px); } }
@keyframes marcar {
  0%, 30% { background: transparent; }
  40%, 85% { background: var(--bad-soft); }
  100% { background: transparent; }
}
@keyframes aparecer { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
}

/* -------------------------------------------------------------- móvil */
@media (max-width: 900px) {
  .heroe { padding: 56px 0 32px; }
  .heroe-rejilla, .rejilla-3, .pasos { grid-template-columns: 1fr; }
  .planes { grid-template-columns: 1fr 1fr; }
  .menu { display: none; }
}
@media (max-width: 560px) {
  .cont { padding: 0 16px; }
  .planes { grid-template-columns: 1fr; }
  .herramienta-fila { flex-direction: column; }
  .cab-acciones .enlace-sutil { display: none; }
  .pie-enlaces { grid-template-columns: 1fr; }
  .fila { grid-template-columns: 1fr 1.6fr 40px; font-size: .72rem; padding: 8px 12px; }
}