/* ==========================================================================
   Encuesta de naturaleza urbana · Comarca Lagunera
   Diseño mobile-first, fluido de 320px a escritorio.
   ========================================================================== */

:root {
  /* Paleta inspirada en el desierto lagunero: arena, agua y vegetación */
  --arena:        #f7f1e6;
  --arena-2:      #efe5d5;
  --superficie:   #ffffff;
  --borde:        #e3d9c9;
  --tinta:        #1d2b2a;
  --tinta-suave:  #5c6b69;
  --teal:         #0d5c55;
  --teal-claro:   #12897d;
  --verde:        #5c9e4a;
  --ambar:        #d98324;
  --error:        #b3261e;
  --ok:           #157347;

  --radio:    clamp(14px, 3.5vw, 20px);
  --radio-s:  clamp(10px, 2.5vw, 14px);
  --sombra:   0 1px 2px rgba(29, 43, 42, .06), 0 8px 24px -12px rgba(29, 43, 42, .25);
  --sombra-s: 0 1px 2px rgba(29, 43, 42, .05), 0 4px 12px -8px rgba(29, 43, 42, .2);

  /* Escala tipográfica fluida: se adapta sola de 320px a 1200px */
  --t-xs:  clamp(0.75rem,  2.6vw, 0.82rem);
  --t-sm:  clamp(0.84rem,  3vw,   0.94rem);
  --t-md:  clamp(0.95rem,  3.5vw, 1.05rem);
  --t-lg:  clamp(1.05rem,  4.4vw, 1.3rem);
  --t-xl:  clamp(1.3rem,   6vw,   1.9rem);

  --toque: 52px; /* altura mínima de un elemento táctil */
}

@media (prefers-color-scheme: dark) {
  :root {
    --arena:       #0b1f1d;
    --arena-2:     #12302d;
    --superficie:  #14322f;
    --borde:       #26514c;
    --tinta:       #e9f2f0;
    --tinta-suave: #9fb8b4;
    --teal:        #2fb0a0;
    --teal-claro:  #56cdbc;
    --verde:       #7cc167;
    --ambar:       #e8a24a;
    --error:       #ff8a80;
    --ok:          #6fcf97;
    --sombra:      0 1px 2px rgba(0,0,0,.4), 0 10px 28px -14px rgba(0,0,0,.7);
    --sombra-s:    0 1px 2px rgba(0,0,0,.35), 0 6px 16px -10px rgba(0,0,0,.6);
  }
}

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

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: var(--t-md);
  line-height: 1.55;
  color: var(--tinta);
  background: var(--arena);
  background-image:
    radial-gradient(ellipse 90% 55% at 10% -5%,  rgba(92, 158, 74, .16), transparent 70%),
    radial-gradient(ellipse 80% 50% at 95% 0%,   rgba(13, 92, 85, .16),  transparent 70%);
  background-attachment: fixed;
  min-height: 100dvh;
  padding-bottom: calc(96px + env(safe-area-inset-bottom));
}

/* ---------------------------------------------------------------- Progreso */
.progreso-barra {
  position: fixed;
  inset: 0 0 auto 0;
  height: 5px;
  background: color-mix(in srgb, var(--borde) 70%, transparent);
  z-index: 20;
}
.progreso-relleno {
  height: 100%;
  width: 0;
  border-radius: 0 99px 99px 0;
  background: linear-gradient(90deg, var(--verde), var(--teal-claro));
  transition: width .35s cubic-bezier(.4, 0, .2, 1);
}

/* --------------------------------------------------------------- Contenedor */
.contenedor {
  width: 100%;
  max-width: 640px;
  margin: 0 auto;
  padding: clamp(20px, 6vw, 40px) clamp(16px, 5vw, 24px) 24px;
}

/* -------------------------------------------------------------- Tipografía */
h1 { font-size: var(--t-xl); line-height: 1.2; margin: 0 0 .5em; letter-spacing: -.01em; }
h2 { font-size: var(--t-lg); line-height: 1.28; margin: 0 0 .6em; letter-spacing: -.005em; }
p  { margin: 0 0 1em; }

.suave   { color: var(--tinta-suave); font-size: var(--t-sm); }
.mini    { font-size: var(--t-xs); }
.centrar { text-align: center; }

/* ------------------------------------------------------------------- Hero */
.hero {
  text-align: center;
  padding: clamp(8px, 4vw, 20px) 0 clamp(16px, 4vw, 24px);
}
.hero-emoji {
  display: inline-grid;
  place-items: center;
  width: clamp(64px, 20vw, 88px);
  height: clamp(64px, 20vw, 88px);
  font-size: clamp(32px, 11vw, 44px);
  border-radius: 999px;
  background: linear-gradient(140deg,
              color-mix(in srgb, var(--verde) 22%, var(--superficie)),
              color-mix(in srgb, var(--teal) 22%, var(--superficie)));
  border: 1px solid var(--borde);
  box-shadow: var(--sombra-s);
  margin-bottom: 18px;
}
.hero h1 { margin-bottom: .35em; }
.etiqueta-tiempo {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: var(--t-xs);
  font-weight: 600;
  color: var(--teal);
  background: color-mix(in srgb, var(--teal) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--teal) 28%, transparent);
  padding: 6px 12px;
  border-radius: 99px;
}

/* ------------------------------------------------------------------- Tarjeta */
.tarjeta {
  background: var(--superficie);
  border: 1px solid var(--borde);
  border-radius: var(--radio);
  box-shadow: var(--sombra);
  padding: clamp(18px, 5vw, 28px);
}
.tarjeta + .tarjeta { margin-top: 14px; }

.bloque-aviso {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 14px 16px;
  border-radius: var(--radio-s);
  background: color-mix(in srgb, var(--ambar) 12%, var(--superficie));
  border: 1px solid color-mix(in srgb, var(--ambar) 30%, transparent);
  font-size: var(--t-sm);
}
.bloque-aviso span[aria-hidden] { font-size: 1.1em; line-height: 1.3; }

/* ---------------------------------------------------------------- Cabecera */
.cabecera-pregunta { margin-bottom: 18px; }
.chip-seccion {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: var(--t-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--teal);
  margin-bottom: 10px;
}
.contador-pregunta {
  font-size: var(--t-xs);
  color: var(--tinta-suave);
  font-variant-numeric: tabular-nums;
  margin-bottom: 6px;
}

/* ----------------------------------------------------------------- Opciones */
fieldset { border: 0; padding: 0; margin: 0; }
legend { padding: 0; }

.lista-opciones {
  display: grid;
  gap: 10px;
  margin: 0;
}

.opcion {
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: var(--toque);
  padding: 12px 14px;
  border: 1.5px solid var(--borde);
  border-radius: var(--radio-s);
  background: var(--superficie);
  cursor: pointer;
  transition: border-color .15s, background-color .15s, transform .1s;
  -webkit-tap-highlight-color: transparent;
}
.opcion:active { transform: scale(.985); }
@media (hover: hover) {
  .opcion:hover { border-color: color-mix(in srgb, var(--teal) 45%, var(--borde)); }
}

.opcion input {
  position: absolute;
  opacity: 0;
  width: 1px;
  height: 1px;
}

.marca {
  flex: 0 0 auto;
  width: 24px;
  height: 24px;
  border: 2px solid color-mix(in srgb, var(--tinta-suave) 55%, transparent);
  display: grid;
  place-items: center;
  transition: border-color .15s, background-color .15s;
}
.marca-radio  { border-radius: 999px; }
.marca-check  { border-radius: 7px; }

.marca::after {
  content: "";
  opacity: 0;
  transition: opacity .15s, transform .15s;
}
.marca-radio::after {
  width: 11px; height: 11px;
  border-radius: 999px;
  background: var(--teal-claro);
  transform: scale(.4);
}
.marca-check::after {
  width: 11px; height: 6px;
  border-left: 2.5px solid #fff;
  border-bottom: 2.5px solid #fff;
  transform: rotate(-45deg) translateY(-1px) scale(.5);
}

.opcion-texto { flex: 1 1 auto; }
.opcion-titulo { font-weight: 500; }
.opcion-desc { display: block; font-size: var(--t-xs); color: var(--tinta-suave); }

/* Estado seleccionado */
.opcion:has(input:checked) {
  border-color: var(--teal);
  background: color-mix(in srgb, var(--teal) 9%, var(--superficie));
}
.opcion:has(input:checked) .opcion-titulo { font-weight: 650; }
.opcion:has(input:checked) .marca-radio { border-color: var(--teal); }
.opcion:has(input:checked) .marca-radio::after { opacity: 1; transform: scale(1); }
.opcion:has(input:checked) .marca-check {
  background: var(--teal);
  border-color: var(--teal);
}
.opcion:has(input:checked) .marca-check::after { opacity: 1; transform: rotate(-45deg) translateY(-1px) scale(1); }

/* Accesibilidad: foco visible */
.opcion:has(input:focus-visible),
.opcion input:focus-visible ~ .marca {
  outline: 3px solid color-mix(in srgb, var(--teal) 45%, transparent);
  outline-offset: 2px;
}

/* ------------------------------------------------------- Botones Sí / No */
.lista-booleano { grid-template-columns: 1fr 1fr; }
.lista-booleano .opcion { justify-content: center; }
.lista-booleano .marca { display: none; }
.lista-booleano .opcion-titulo { font-weight: 650; }
.lista-booleano .opcion:has(input:checked) {
  background: var(--teal);
  border-color: var(--teal);
  color: #fff;
}

/* ------------------------------------------------------------ Escala 1-5 */
.escala { display: grid; grid-template-columns: repeat(5, 1fr); gap: 8px; }
.escala .opcion {
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  padding: 12px 4px;
  min-height: 68px;
}
.escala .marca { display: none; }
.escala .numero { font-size: var(--t-lg); font-weight: 700; font-variant-numeric: tabular-nums; }
.escala .opcion:has(input:checked) {
  background: linear-gradient(160deg, var(--teal-claro), var(--teal));
  border-color: var(--teal);
  color: #fff;
}
.escala-extremos {
  display: flex;
  justify-content: space-between;
  font-size: var(--t-xs);
  color: var(--tinta-suave);
  margin-top: 8px;
}

/* --------------------------------------------------------------- Texto libre */
.campo-texto,
.campo-otro {
  width: 100%;
  font: inherit;
  color: var(--tinta);
  background: var(--superficie);
  border: 1.5px solid var(--borde);
  border-radius: var(--radio-s);
  padding: 13px 14px;
  min-height: var(--toque);
  transition: border-color .15s, box-shadow .15s;
  resize: vertical;
}
.campo-texto:focus,
.campo-otro:focus {
  outline: none;
  border-color: var(--teal);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--teal) 18%, transparent);
}
.campo-texto::placeholder,
.campo-otro::placeholder { color: color-mix(in srgb, var(--tinta-suave) 75%, transparent); }
.contador-caracteres {
  display: block;
  text-align: right;
  font-size: var(--t-xs);
  color: var(--tinta-suave);
  margin-top: 6px;
  font-variant-numeric: tabular-nums;
}

.campo-otro-contenedor {
  margin-top: 10px;
  padding-left: 12px;
  border-left: 3px solid color-mix(in srgb, var(--teal) 35%, transparent);
}
.etiqueta-campo {
  display: block;
  font-size: var(--t-xs);
  font-weight: 650;
  color: var(--tinta-suave);
  margin-bottom: 6px;
}

/* ------------------------------------------------------------------ Botones */
.barra-acciones {
  position: fixed;
  inset: auto 0 0 0;
  z-index: 15;
  background: color-mix(in srgb, var(--arena) 88%, transparent);
  backdrop-filter: blur(12px);
  border-top: 1px solid var(--borde);
  padding: 12px 0 calc(12px + env(safe-area-inset-bottom));
}
.barra-acciones-interior {
  width: 100%;
  max-width: 640px;
  margin: 0 auto;
  padding: 0 clamp(16px, 5vw, 24px);
  display: flex;
  gap: 10px;
}

.turnstile-contenedor { display: flex; justify-content: center; margin-bottom: 10px; }
.turnstile-contenedor[hidden] { display: none; }

/* ------------------------------------------------- Consentimiento informado */
.apartados { display: grid; gap: 2px; }
.apartado {
  padding: 14px 0;
  border-top: 1px solid var(--borde);
}
.apartado:first-child { border-top: 0; padding-top: 0; }
.apartado h3 {
  font-size: var(--t-sm);
  font-weight: 700;
  letter-spacing: .01em;
  color: var(--teal);
  margin: 0 0 6px;
}
.apartado p {
  margin: 0;
  font-size: var(--t-sm);
  color: var(--tinta-suave);
  line-height: 1.6;
}
.apartado a { color: var(--teal); }

.boton {
  font: inherit;
  font-weight: 650;
  min-height: var(--toque);
  padding: 0 20px;
  border-radius: var(--radio-s);
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: transform .1s, background-color .15s, border-color .15s, opacity .15s;
  -webkit-tap-highlight-color: transparent;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}
.boton:active:not(:disabled) { transform: scale(.97); }
.boton:disabled { opacity: .55; cursor: not-allowed; }
.boton:focus-visible { outline: 3px solid color-mix(in srgb, var(--teal) 45%, transparent); outline-offset: 2px; }

.boton-primario {
  flex: 1 1 auto;
  background: linear-gradient(160deg, var(--teal-claro), var(--teal));
  color: #fff;
  box-shadow: 0 6px 16px -8px color-mix(in srgb, var(--teal) 80%, transparent);
}
.boton-primario:hover:not(:disabled) { filter: brightness(1.06); }

.boton-fantasma {
  flex: 0 0 auto;
  background: transparent;
  color: var(--tinta-suave);
  border-color: var(--borde);
}
.boton-fantasma:hover:not(:disabled) { border-color: var(--teal); color: var(--teal); }

.boton-ancho { width: 100%; }

/* --------------------------------------------------------------- Mensajes */
.mensaje-error {
  display: flex;
  gap: 8px;
  align-items: flex-start;
  margin-top: 14px;
  padding: 11px 14px;
  border-radius: var(--radio-s);
  background: color-mix(in srgb, var(--error) 10%, var(--superficie));
  border: 1px solid color-mix(in srgb, var(--error) 32%, transparent);
  color: var(--error);
  font-size: var(--t-sm);
  font-weight: 500;
}
.mensaje-error[hidden] { display: none; }

.pantalla-final { text-align: center; }
.pantalla-final .hero-emoji {
  background: linear-gradient(140deg,
              color-mix(in srgb, var(--verde) 30%, var(--superficie)),
              color-mix(in srgb, var(--teal) 26%, var(--superficie)));
}
.folio {
  display: inline-block;
  font-family: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  font-size: var(--t-sm);
  letter-spacing: .04em;
  background: color-mix(in srgb, var(--teal) 10%, transparent);
  border: 1px dashed color-mix(in srgb, var(--teal) 40%, transparent);
  border-radius: var(--radio-s);
  padding: 10px 14px;
  margin-top: 6px;
  word-break: break-all;
}

/* --------------------------------------------------------------- Utilidades */
.oculto { display: none !important; }
.aviso-error {
  color: var(--error);
  background: color-mix(in srgb, var(--error) 10%, var(--superficie));
  border: 1px solid var(--error);
  border-radius: var(--radio-s);
  padding: 14px;
}

/* Animación de entrada de cada pantalla */
@keyframes entrar {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: none; }
}
.animar { animation: entrar .22s ease-out both; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

/* ---------------------------------------------------- Pantallas muy chicas */
@media (max-width: 360px) {
  :root { --toque: 48px; }
  .escala { gap: 5px; }
  .escala .opcion { min-height: 60px; padding: 10px 2px; }
  .barra-acciones-interior { gap: 8px; }
  .boton { padding: 0 14px; }
}

/* --------------------------------------------------------------- Escritorio */
@media (min-width: 720px) {
  .contenedor { padding-top: 56px; }
  .lista-opciones { gap: 12px; }
}