/* BrainSG · web pública (portada, login, cuenta, privacidad). Sin dependencias: fuentes del sistema. */
:root {
  --fondo: #f5f7fb; --fondo2: #eaf0f8; --caja: #ffffff; --texto: #0f172a; --suave: #475569; --tenue: #64748b;
  --linea: #dbe3ee; --verde: #0f9d58; --verde2: #0b7d46; --cielo: #0284c7; --aviso: #b45309; --aviso-fondo: #fff7ed;
  --sombra: 0 10px 30px rgba(15, 23, 42, .08); --r: 16px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --fondo: #070b14; --fondo2: #0d1424; --caja: #111a2c; --texto: #e7eef8; --suave: #a8b6cc; --tenue: #7c8aa3;
    --linea: #1f2a40; --verde: #22c55e; --verde2: #16a34a; --cielo: #38bdf8; --aviso: #fbbf24; --aviso-fondo: #1f1a0e;
    --sombra: 0 10px 30px rgba(0, 0, 0, .35);
  }
}
:root[data-theme="dark"] {
  --fondo: #070b14; --fondo2: #0d1424; --caja: #111a2c; --texto: #e7eef8; --suave: #a8b6cc; --tenue: #7c8aa3;
  --linea: #1f2a40; --verde: #22c55e; --verde2: #16a34a; --cielo: #38bdf8; --aviso: #fbbf24; --aviso-fondo: #1f1a0e;
  --sombra: 0 10px 30px rgba(0, 0, 0, .35);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--fondo); color: var(--texto); font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; -webkit-font-smoothing: antialiased; }
a { color: var(--cielo); }
img, svg { display: block; }
.ancho { max-width: 1120px; margin: 0 auto; padding: 0 16px; }
[hidden] { display: none !important; }

/* Cabecera */
.cabecera { position: sticky; top: 0; z-index: 10; background: color-mix(in srgb, var(--fondo) 85%, transparent); backdrop-filter: blur(10px); border-bottom: 1px solid var(--linea); }
.cabecera .ancho { display: flex; align-items: center; justify-content: space-between; height: 64px; gap: 16px; }
.marca { display: flex; align-items: center; gap: 10px; color: var(--texto); text-decoration: none; font-weight: 750; font-size: 19px; letter-spacing: -.01em; }
.marca svg { width: 30px; height: 30px; }
.menu { display: flex; align-items: center; gap: 22px; }
.menu a.texto { color: var(--suave); text-decoration: none; font-size: 15px; }
.menu a.texto:hover { color: var(--texto); }
@media (max-width: 640px) { .menu a.texto { display: none; } }

/* Botones */
.boton { display: inline-flex; align-items: center; justify-content: center; gap: 10px; padding: 12px 20px; border-radius: 12px; font: inherit; font-weight: 650; text-decoration: none; border: 1px solid transparent; cursor: pointer; transition: transform .08s, background .15s; }
.boton:active { transform: translateY(1px); }
.boton.verde { background: var(--verde); color: #fff; }
.boton.verde:hover { background: var(--verde2); }
.boton.borde { background: transparent; color: var(--texto); border-color: var(--linea); }
.boton.borde:hover { background: var(--fondo2); }
.boton.grande { padding: 15px 24px; font-size: 17px; }
.boton.google { background: #fff; color: #1f1f1f; border-color: #dadce0; width: 100%; padding: 13px 18px; }
.boton.google:hover { background: #f8f9fa; }
.boton.google svg { width: 20px; height: 20px; }
.boton[disabled] { opacity: .6; cursor: default; }

/* Portada */
.heroe { padding: 72px 0 56px; background: radial-gradient(900px 420px at 85% 0%, color-mix(in srgb, var(--verde) 16%, transparent), transparent 70%), radial-gradient(700px 380px at 0% 30%, color-mix(in srgb, var(--cielo) 12%, transparent), transparent 70%); }
.heroe .ancho { display: grid; grid-template-columns: 1.15fr .85fr; gap: 48px; align-items: center; }
@media (max-width: 900px) { .heroe .ancho { grid-template-columns: 1fr; } .heroe { padding-top: 48px; } }
.etiqueta { display: inline-flex; align-items: center; gap: 8px; padding: 6px 12px; border: 1px solid var(--linea); border-radius: 999px; color: var(--suave); font-size: 14px; background: var(--caja); }
.etiqueta i { width: 8px; height: 8px; border-radius: 50%; background: var(--verde); box-shadow: 0 0 0 4px color-mix(in srgb, var(--verde) 20%, transparent); }
h1 { font-size: clamp(36px, 5.2vw, 58px); line-height: 1.05; letter-spacing: -.03em; margin: 18px 0 18px; }
h1 em { font-style: normal; background: linear-gradient(90deg, var(--verde), var(--cielo)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.entrada { font-size: 19px; color: var(--suave); max-width: 600px; margin: 0 0 28px; }
.acciones { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.nota { color: var(--tenue); font-size: 14px; margin-top: 14px; }

.tarjeta-bot { background: var(--caja); border: 1px solid var(--linea); border-radius: 20px; box-shadow: var(--sombra); padding: 22px; }
.tarjeta-bot .cab { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; }
.tarjeta-bot .cab b { font-size: 15px; }
.muestra { font-size: 12px; color: var(--tenue); border: 1px dashed var(--linea); padding: 2px 8px; border-radius: 999px; }
.fila { display: flex; justify-content: space-between; align-items: center; padding: 12px 0; border-top: 1px solid var(--linea); font-size: 15px; }
.fila span { color: var(--suave); }
.prob { font-weight: 750; color: var(--verde); }
.barra { height: 8px; border-radius: 99px; background: var(--fondo2); overflow: hidden; margin: 6px 0 4px; }
.barra i { display: block; height: 100%; width: 94%; background: linear-gradient(90deg, var(--cielo), var(--verde)); }
.estado-bot { margin-top: 14px; display: flex; align-items: center; gap: 10px; padding: 12px 14px; border-radius: 12px; background: color-mix(in srgb, var(--verde) 12%, transparent); color: var(--verde); font-weight: 650; font-size: 15px; }

/* Secciones */
section.bloque { padding: 72px 0; }
section.bloque.alterno { background: var(--fondo2); }
h2 { font-size: clamp(28px, 3.6vw, 40px); letter-spacing: -.02em; line-height: 1.15; margin: 0 0 12px; }
.sub { color: var(--suave); font-size: 18px; margin: 0 0 36px; max-width: 680px; }
.pasos { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; counter-reset: paso; }
.rejilla { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
@media (max-width: 900px) { .pasos, .rejilla { grid-template-columns: 1fr; } }
.caja { background: var(--caja); border: 1px solid var(--linea); border-radius: var(--r); padding: 24px; }
.caja h3 { margin: 0 0 8px; font-size: 19px; }
.caja p { margin: 0; color: var(--suave); }
.paso::before { counter-increment: paso; content: counter(paso); display: grid; place-items: center; width: 36px; height: 36px; border-radius: 10px; background: color-mix(in srgb, var(--verde) 15%, transparent); color: var(--verde); font-weight: 800; margin-bottom: 14px; }
.icono { width: 40px; height: 40px; border-radius: 10px; display: grid; place-items: center; background: color-mix(in srgb, var(--cielo) 14%, transparent); color: var(--cielo); margin-bottom: 14px; }
.icono svg { width: 22px; height: 22px; }

.riesgo { display: flex; gap: 16px; align-items: flex-start; background: var(--aviso-fondo); border: 1px solid color-mix(in srgb, var(--aviso) 40%, transparent); border-radius: var(--r); padding: 22px 24px; }
.riesgo svg { flex: none; width: 26px; height: 26px; color: var(--aviso); margin-top: 2px; }
.riesgo h3 { margin: 0 0 6px; font-size: 18px; }
.riesgo p { margin: 0; color: var(--suave); }

details { background: var(--caja); border: 1px solid var(--linea); border-radius: 14px; padding: 16px 20px; margin-bottom: 12px; }
summary { cursor: pointer; font-weight: 650; list-style: none; display: flex; justify-content: space-between; gap: 16px; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; color: var(--tenue); font-weight: 400; font-size: 22px; line-height: 1; }
details[open] summary::after { content: "–"; }
details p { color: var(--suave); margin: 12px 0 0; }

.final { text-align: center; }
.final .sub { margin-left: auto; margin-right: auto; }

footer { border-top: 1px solid var(--linea); padding: 32px 0 40px; color: var(--tenue); font-size: 14px; }
footer .ancho { display: grid; gap: 14px; }
footer .enlaces { display: flex; flex-wrap: wrap; gap: 18px; }
footer a { color: var(--suave); }

/* Páginas de una tarjeta (login, cuenta) */
.centro { min-height: calc(100vh - 64px); display: grid; place-items: center; padding: 40px 16px; }
.panel { width: 100%; max-width: 440px; background: var(--caja); border: 1px solid var(--linea); border-radius: 20px; box-shadow: var(--sombra); padding: 32px; }
.panel h1 { font-size: 28px; margin: 0 0 8px; }
.panel .entrada { font-size: 16px; margin-bottom: 24px; }
.letra-chica { color: var(--tenue); font-size: 13px; margin-top: 16px; text-align: center; }
.error { background: color-mix(in srgb, #ef4444 12%, transparent); color: #dc2626; border-radius: 10px; padding: 12px 14px; margin-bottom: 16px; font-size: 15px; }
@media (prefers-color-scheme: dark) { .error { color: #fca5a5; } }
.datos { display: grid; gap: 0; margin: 20px 0 24px; }
.datos div { display: flex; justify-content: space-between; gap: 16px; padding: 12px 0; border-top: 1px solid var(--linea); font-size: 15px; }
.datos div:first-child { border-top: 0; }
.datos dt { color: var(--tenue); }
.datos dd { margin: 0; text-align: right; font-weight: 600; }
.pastilla { display: inline-block; padding: 3px 10px; border-radius: 999px; font-size: 13px; font-weight: 700; }
.pastilla.ok { background: color-mix(in srgb, var(--verde) 15%, transparent); color: var(--verde); }
.pastilla.pausa { background: color-mix(in srgb, var(--aviso) 18%, transparent); color: var(--aviso); }
.pastilla.espera { background: color-mix(in srgb, var(--cielo) 15%, transparent); color: var(--cielo); }
.primeros { background: var(--fondo2); border-radius: 12px; padding: 16px 18px; margin-top: 20px; color: var(--suave); font-size: 14px; }
.primeros ol { margin: 6px 0 0; padding-left: 20px; }

/* Texto legal */
.legal { max-width: 760px; margin: 0 auto; padding: 48px 16px 72px; }
.legal h1 { font-size: 36px; }
.legal h2 { font-size: 22px; margin-top: 36px; }
.legal p, .legal li { color: var(--suave); }