/* ==========================================================================
   VALKER · estilos de la web (landing, registro, login, recuperar, donar)
   Estilo B «Fuego y hielo» (spec 002, D-8). UNA sola hoja para todas las páginas.

   >>> PARA CAMBIAR EL ASPECTO TOCA SOLO EL BLOQUE :root DE ABAJO <<<
   Cambia un valor, guarda y recarga el navegador (F5).
   ========================================================================== */
:root {
  --fondo: #070607;
  --fondo-panel: #0d0605;
  --texto: #f4f1ee;
  --texto-suave: #a39a94;
  --brasa: #e8641a;           /* fuego: resplandor y botones al pasar el ratón */
  --acento: #ff9a4d;          /* fuego claro: palabras destacadas */
  --hielo: #7fc8d6;           /* frío: etiquetas y detalles pequeños */
  --linea: rgba(244,241,238,.28);
  --ok: #8fd19e;
  --error: #ff8a7a;
  --fuente-ui: "Josefin Sans", Helvetica, Arial, sans-serif;
  --fuente-titulos: "Cormorant Garamond", Georgia, serif;
}

/* ---------- Base ---------- */
* { box-sizing: border-box; margin: 0; }
html { scroll-behavior: smooth; }
body { background: var(--fondo); color: var(--texto); font-family: var(--fuente-ui); font-weight: 300; line-height: 1.7; }
a { color: inherit; text-decoration: none; }
[hidden] { display: none !important; }
.contenedor { width: min(1100px, 100% - 40px); margin-inline: auto; }

/* ---------- Barra superior ---------- */
.nav { position: fixed; inset: 0 0 auto 0; z-index: 10; padding: 14px 0; background: linear-gradient(180deg, rgba(7,6,7,.92) 55%, rgba(7,6,7,0)); }
.nav .contenedor { display: flex; justify-content: space-between; align-items: center; gap: 20px; }
.logo { font-weight: 600; letter-spacing: .5em; font-size: .95rem; text-transform: uppercase; }
.nav-enlaces { display: flex; align-items: center; gap: 26px; font-size: .78rem; letter-spacing: .2em; text-transform: uppercase; }
.nav-enlaces a:hover { color: var(--acento); }
.descubrir { width: 74px; height: 74px; border-radius: 50%; border: 1px solid var(--linea); display: grid; place-items: center;
  font-size: .62rem; letter-spacing: .2em; text-transform: uppercase; transition: .3s; background: rgba(7,6,7,.5); backdrop-filter: blur(6px); }
.descubrir:hover { border-color: var(--hielo); color: var(--hielo); }
@media (max-width: 760px) { .nav-enlaces a.opcional { display: none; } }

/* ---------- Botones: línea fina con círculo de flecha ---------- */
.btn { display: inline-flex; align-items: center; gap: 16px; padding: 14px 14px 14px 28px; border: 1px solid var(--linea); text-transform: uppercase;
  letter-spacing: .28em; font-size: .72rem; font-weight: 600; transition: .3s; background: rgba(7,6,7,.4); color: var(--texto); font-family: inherit; cursor: pointer; }
.btn::after { content: "→"; width: 34px; height: 34px; border-radius: 50%; border: 1px solid var(--linea); display: grid; place-items: center; letter-spacing: 0; font-size: 1rem; transition: .3s; }
.btn:hover, .btn:focus-visible { border-color: var(--brasa); color: var(--acento); box-shadow: 0 0 34px rgba(232,100,26,.35); outline: none; }
.btn:hover::after, .btn:focus-visible::after { background: var(--brasa); border-color: var(--brasa); color: #1a0a05; }
.btn:disabled { opacity: .5; cursor: wait; }
.btn.sin-flecha::after { display: none; }
.btn.sin-flecha { padding: 14px 28px; }

/* ---------- Héroe de la landing ---------- */
.hero { position: relative; min-height: 100svh; display: flex; align-items: flex-end; overflow: hidden;
  background:
    radial-gradient(ellipse 55% 55% at 78% 22%, rgba(127,200,214,.30), transparent 65%),
    radial-gradient(ellipse 70% 55% at 18% 105%, rgba(232,100,26,.66), transparent 66%),
    radial-gradient(ellipse 40% 30% at 55% 100%, rgba(255,154,77,.22), transparent 70%),
    linear-gradient(180deg, #06080b 0%, var(--fondo) 100%); }
.hero::after { content: ""; position: absolute; inset: auto 0 0 0; height: 14%; background: linear-gradient(0deg, rgba(7,6,7,.8), transparent); }
.chispa { position: absolute; bottom: -10px; width: 3px; height: 3px; border-radius: 50%; background: #ffb877; box-shadow: 0 0 8px 2px rgba(255,154,77,.7); opacity: 0; animation: subir linear infinite; }
@keyframes subir { 0% { transform: translate(0,0); opacity: 0; } 12% { opacity: .9; } 100% { transform: translate(var(--dx), -85vh); opacity: 0; } }
@media (prefers-reduced-motion: reduce) { .chispa { display: none; } }
.hero-contenido { position: relative; z-index: 2; padding: 0 0 13vh; width: min(1100px, 100% - 40px); margin-inline: auto; }
.eyebrow { font-size: .72rem; letter-spacing: .6em; text-transform: uppercase; color: var(--hielo); margin-bottom: 20px; }
.hero h1 { font-family: var(--fuente-titulos); font-weight: 400; font-size: clamp(3.4rem, 13vw, 9.5rem); line-height: .9; letter-spacing: .02em; }
.hero h1 i { color: var(--acento); text-shadow: 0 0 50px rgba(232,100,26,.55); }
.hero p.lema { max-width: 46ch; color: #c4bab3; margin: 28px 0 36px; font-size: 1.05rem; }
.acciones { display: flex; flex-wrap: wrap; gap: 16px; }
.hero .linea-v { position: absolute; right: 28px; bottom: 0; width: 1px; height: 18vh; background: var(--linea); z-index: 3; }

/* ---------- Secciones en filas ---------- */
section.bloque { padding: 110px 0; border-top: 1px solid var(--linea); }
.etiqueta { font-size: .7rem; letter-spacing: .5em; text-transform: uppercase; color: var(--hielo); margin-bottom: 14px; }
h2 { font-family: var(--fuente-titulos); font-weight: 400; font-size: clamp(2.2rem, 6vw, 4rem); line-height: 1.05; margin-bottom: 18px; }
.sub { color: var(--texto-suave); max-width: 50ch; margin-bottom: 60px; }
.filas { border-top: 1px solid var(--linea); }
.fila { display: grid; grid-template-columns: 110px 1fr 1.4fr; gap: 24px; align-items: baseline; padding: 30px 0; border-bottom: 1px solid var(--linea); transition: .3s; }
.fila:hover { padding-left: 14px; border-color: var(--brasa); background: linear-gradient(90deg, rgba(232,100,26,.1), transparent 60%); }
.fila .n { font-family: var(--fuente-titulos); font-size: 3.4rem; line-height: 1; color: transparent; -webkit-text-stroke: 1px rgba(127,200,214,.45); transition: .3s; }
.fila:hover .n { -webkit-text-stroke-color: var(--acento); }
.fila h3 { font-family: var(--fuente-titulos); font-weight: 400; font-size: 1.9rem; }
.fila p { color: var(--texto-suave); }
@media (max-width: 760px) { .fila { grid-template-columns: 70px 1fr; } .fila p { grid-column: 2; } .fila .n { font-size: 2.4rem; } }
.donar { text-align: center; background: radial-gradient(ellipse 60% 90% at 50% 125%, rgba(232,100,26,.38), transparent 70%), radial-gradient(ellipse 40% 60% at 85% -10%, rgba(127,200,214,.14), transparent 70%); }
.donar .sub { margin-inline: auto; }
.donar .acciones { justify-content: center; }
footer { padding: 36px 0; text-align: center; color: var(--texto-suave); font-size: .78rem; letter-spacing: .2em; text-transform: uppercase; border-top: 1px solid var(--linea); }
footer a:hover { color: var(--acento); }

/* PROVISIONAL: QR del sitio en el pie de la portada (se oculta en pantallas de celular, donde no sirve) */
.qr-sitio { display: flex; flex-direction: column; align-items: center; gap: 12px; margin-bottom: 28px; }
.qr-sitio img { width: 185px; height: 185px; background: #fff; border: 1px solid var(--linea); }
.qr-sitio p { margin: 0; font-size: .72rem; letter-spacing: .15em; }
@media (max-width: 760px) { .qr-sitio { display: none; } }

/* ---------- Páginas de cuenta (registro, login, recuperar, donar) ---------- */
.pagina-cuenta { min-height: 100svh; display: grid; place-items: center; padding: 110px 20px 60px;
  background:
    radial-gradient(ellipse 70% 55% at 18% 105%, rgba(232,100,26,.5), transparent 66%),
    radial-gradient(ellipse 55% 55% at 82% 8%, rgba(127,200,214,.22), transparent 65%),
    var(--fondo); }
.panel { width: min(460px, 100%); border: 1px solid var(--linea); background: rgba(13,6,5,.78); padding: 38px 32px; backdrop-filter: blur(6px); }
.panel h1 { font-family: var(--fuente-titulos); font-weight: 400; font-size: 2.3rem; line-height: 1.1; margin-bottom: 8px; }
.panel .intro { color: var(--texto-suave); margin-bottom: 24px; font-size: .95rem; }
.campo { margin-bottom: 18px; }
.campo label { display: block; font-size: .7rem; letter-spacing: .3em; text-transform: uppercase; color: var(--hielo); margin-bottom: 8px; }
.campo input { width: 100%; padding: 12px 14px; background: var(--fondo-panel); border: 1px solid var(--linea); color: var(--texto); font: inherit; font-weight: 400; font-size: 1rem; transition: .2s; }
.campo input:focus { outline: none; border-color: var(--brasa); box-shadow: 0 0 0 3px rgba(232,100,26,.2); }
.campo .ayuda { font-size: .78rem; color: var(--texto-suave); margin-top: 6px; }
.captcha-pregunta { display: flex; gap: 12px; align-items: center; margin-bottom: 8px; color: var(--texto); font-weight: 400; }
.enlace-chico { background: none; border: 0; color: var(--acento); font: inherit; font-size: .78rem; cursor: pointer; text-decoration: underline; padding: 0; }
.mensaje { padding: 12px 14px; border: 1px solid var(--linea); margin-bottom: 18px; font-size: .92rem; font-weight: 400; }
.mensaje.ok { border-color: var(--ok); color: var(--ok); }
.mensaje.error { border-color: var(--error); color: var(--error); }
.panel .pie { margin-top: 24px; font-size: .85rem; color: var(--texto-suave); display: flex; flex-direction: column; gap: 6px; }
.panel .pie a { color: var(--acento); text-decoration: underline; }
.panel .acciones { margin-top: 8px; }
.bloque-reenvio { margin-top: 22px; padding-top: 20px; border-top: 1px solid var(--linea); }