/* ═══════════════════════════════════════════════════════════
   main.css — Variables, reset, tipografía, layout base
   Ean Elemental
═══════════════════════════════════════════════════════════ */

:root {
  /* ── Paleta base ────────────────────────────────────── */
  --verde-claro:   #4ade80;
  --verde-medio:   #4caf50;
  --verde-osc:     #2e7d32;
  --verde-muy-osc: #1b5e20;
  --turquesa-bri:  #2bbbad;
  --turquesa-med:  #2AA589;
  --turquesa-osc:  #008272;
  --turquesa-muy:  #005C4D;
  --cian:          #22d3ee;
  --azul:          #3b82f6;
  --azul-osc:      #003B4C;
  --violeta:       #5C2AB2;
  --morado:        #892AB2;
  --rosa-viol:     #B22A89;
  --neutral:       #776e65;

  /* ── Colores por categoría química ─────────────────── */
  --cat-metal-alcalino:        #4caf50;
  --cat-metal-alcalinoterreo:  #2AA589;
  --cat-metal-transicion:      #22d3ee;
  --cat-metal-post-transicion: #3b82f6;
  --cat-metaloide:             #2bbbad;
  --cat-no-metal-diatomico:    #4ade80;
  --cat-no-metal:              #86efac;
  --cat-halogeno:              #008272;
  --cat-gas-noble:             #003B4C;
  --cat-lantanido:             #5C2AB2;
  --cat-actinido:              #892AB2;
  --cat-desconocido:           #776e65;

  /* ── Fondos oscuros ─────────────────────────────────── */
  --fondo-body:    #090d18;
  --fondo-panel:   #111827;
  --fondo-panel-2: #1a2332;
  --fondo-carta:   #0f1624;
  --fondo-stat:    rgba(255,255,255,0.05);

  /* ── Texto ──────────────────────────────────────────── */
  --texto-1: #f0f4ff;
  --texto-2: #9ca3af;
  --texto-3: #6b7280;

  /* ── Degradado marca ────────────────────────────────── */
  --grad-ean: linear-gradient(135deg, #4ade80 0%, #22d3ee 50%, #3b82f6 100%);

  /* ── Sombras ────────────────────────────────────────── */
  --sombra-s: 0 4px 12px rgba(0,0,0,0.4);
  --sombra-m: 0 8px 28px rgba(0,0,0,0.55);
  --sombra-l: 0 16px 48px rgba(0,0,0,0.7);

  /* ── Radios ─────────────────────────────────────────── */
  --r-sm: 6px;
  --r-md: 12px;
  --r-lg: 20px;
  --r-xl: 28px;

  /* ── Transición base ────────────────────────────────── */
  --t: all 0.3s ease;
}

/* ── Reset ───────────────────────────────────────────────── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

html {
  font-size: 16px;
  scroll-behavior: smooth;
  background-color: var(--fondo-body);
}

body {
  font-family: 'Inter', 'Arial', sans-serif;
  background-color: var(--fondo-body);
  min-height: 100vh;
  min-height: -webkit-fill-available;
  color: var(--texto-1);
  overflow-x: hidden;
  position: relative;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(ellipse at 20% 10%, rgba(43,187,173,0.07) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 90%, rgba(59,130,246,0.07) 0%, transparent 50%),
    linear-gradient(160deg, #090d18 0%, #0d1b2a 60%, #090f1e 100%);
  top: -100px;
  bottom: -100px;
}

/* ── Scrollbar ──────────────────────────────────────────── */
::-webkit-scrollbar         { width: 7px; height: 7px; }
::-webkit-scrollbar-track   { background: #090d18; }
::-webkit-scrollbar-thumb   { background: var(--turquesa-bri); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--cian); }

/* ── Cabecera ───────────────────────────────────────────── */
.cabecera {
  text-align: center;
  padding: 44px 20px 24px;
}

.cabecera__titulo {
  font-family: 'Orbitron', sans-serif;
  font-size: clamp(2rem, 6vw, 4rem);
  font-weight: 900;
  letter-spacing: 0.06em;
  line-height: 1;
  margin-bottom: 10px;
}

.cabecera__ean {
  background: var(--grad-ean);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.cabecera__elemental {
  color: var(--texto-1);
  margin-left: 10px;
}

.cabecera__subtitulo {
  font-size: 0.85rem;
  color: var(--texto-3);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

/* ── Layout ─────────────────────────────────────────────── */
.main {
  padding: 24px 16px 80px;
  max-width: 1440px;
  margin: 0 auto;
}

/* ── Accesibilidad ──────────────────────────────────────── */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

:focus-visible {
  outline: 2px solid var(--cian);
  outline-offset: 3px;
  border-radius: var(--r-sm);
}

/* ══════════════════════════════════════════════════════════
   TUTORIAL — sección explicacion-ficha
═══════════════════════════════════════════════════════════ */

.explicacion-ficha {
  margin: 48px 0 0;
  padding: 0 0 60px;
}

.explicacion-ficha__titulo {
  font-family: 'Orbitron', sans-serif;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--cian);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  text-align: center;
  margin-bottom: 20px;
}

.boceto {
  border: 2px dashed rgba(34,211,238,0.35);
  border-radius: 20px;
  padding: 28px 32px 36px;
  position: relative;
  background: rgba(34,211,238,0.03);
  width: 100%;
}

.boceto__etiqueta {
  position: absolute;
  top: -11px;
  left: 24px;
  background: var(--fondo-body);
  padding: 0 10px;
  font-family: 'Orbitron', sans-serif;
  font-size: 0.55rem;
  color: rgba(34,211,238,0.5);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.boceto__contenido {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 32px;
  align-items: start;
}

.col-izq {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.col-der {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* ── Carta demo ────────────────────────────────────────── */
.carta-demo {
  width: 160px;
  flex-shrink: 0;
  background: var(--fondo-carta);
  border-radius: 18px;
  border: 2px solid var(--turquesa-bri);
  position: relative;
  box-shadow: 0 0 24px rgba(43,187,173,0.2);
}

.carta-demo__cab {
  background: linear-gradient(90deg, var(--turquesa-bri), rgba(43,187,173,0.3));
  padding: 8px 10px;
  border-radius: 16px 16px 0 0;
  display: flex;
  align-items: center;
  gap: 6px;
}
.carta-demo__num {
  font-family: 'Orbitron', sans-serif;
  font-size: 0.55rem;
  font-weight: 700;
  background: rgba(0,0,0,0.2);
  color: rgba(0,0,0,0.6);
  padding: 2px 5px;
  border-radius: 4px;
}
.carta-demo__simbolo { font-family: 'Orbitron', sans-serif; font-size: 0.9rem; font-weight: 900; color: #fff; }
.carta-demo__nombre  { font-size: 0.55rem; color: rgba(255,255,255,0.8); }
.carta-demo__fase {
  margin-left: auto;
  font-family: 'Orbitron', sans-serif;
  font-size: 0.42rem;
  font-weight: 700;
  color: rgba(255,255,255,0.6);
  background: rgba(0,0,0,0.2);
  padding: 3px 5px;
  border-radius: 4px;
}

.carta-demo__visual {
  background: rgba(43,187,173,0.1);
  padding: 14px 10px 10px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.carta-demo__simbolo-grande {
  font-family: 'Orbitron', sans-serif;
  font-size: 2.8rem;
  font-weight: 900;
  color: var(--turquesa-bri);
  line-height: 1;
  text-shadow: 0 0 30px rgba(43,187,173,0.6);
}
.carta-demo__estrellas {
  display: flex;
  gap: 6px;
  align-items: flex-end;
  justify-content: center;
}
.estrella-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1px;
}
.estrella-item span:first-child { font-size: 0.75rem; line-height: 1; }
.estrella-item span:last-child  { font-family: 'Orbitron', sans-serif; font-size: 0.36rem; font-weight: 700; }

.carta-demo__stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5px;
  padding: 8px;
}
.stat-mini {
  background: rgba(255,255,255,0.04);
  border-radius: 6px;
  padding: 5px 6px;
  border: 1px solid rgba(255,255,255,0.05);
}
.stat-mini__label {
  display: block;
  font-size: 0.38rem;
  color: var(--texto-3);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 2px;
}
.stat-mini__valor {
  display: block;
  font-family: 'Orbitron', sans-serif;
  font-size: 0.58rem;
  font-weight: 700;
  color: var(--texto-1);
}

.carta-demo__nav {
  padding: 7px 8px 9px;
  border-top: 1px solid rgba(255,255,255,0.06);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}
.dots { display: flex; gap: 6px; align-items: center; }
.dot  { width: 6px; height: 6px; border-radius: 50%; background: rgba(255,255,255,0.2); }
.dot--activo { background: var(--turquesa-bri); transform: scale(1.3); box-shadow: 0 0 5px var(--turquesa-bri); }
.nav-labels { display: flex; gap: 8px; }
.nav-label  { font-family: 'Orbitron', sans-serif; font-size: 0.38rem; color: var(--texto-3); text-transform: uppercase; letter-spacing: 0.06em; }
.nav-label--activo { color: var(--turquesa-bri); }

.carta-demo__pie {
  padding: 6px 10px;
  border-top: 1px solid rgba(255,255,255,0.06);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(255,255,255,0.02);
  border-radius: 0 0 16px 16px;
  overflow: hidden;
}
.pie-serie { font-family: 'Orbitron', sans-serif; font-size: 0.38rem; color: var(--texto-3); }
.pie-cat   { font-size: 0.4rem; color: var(--turquesa-bri); font-weight: 600; }

.flecha-nav {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,0.15);
  background: rgba(9,13,24,0.9);
  color: var(--texto-2);
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  cursor: default;
}

.bic-con-anot {
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex-shrink: 0;
}

.bic-fila {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 36px;
}

.bic-fila--extra { padding-left: 0; }
.anot__espacio   { width: 36px; flex-shrink: 0; }

.sep-bic {
  width: 100%;
  height: 1px;
  background: rgba(255,255,255,0.12);
  margin: 2px 0;
}

.btn-bic {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 2px solid rgba(255,255,255,0.15);
  background: var(--fondo-panel-2);
  color: var(--texto-2);
  font-family: 'Orbitron', sans-serif;
  font-size: 0.62rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: default;
  pointer-events: none;
  flex-shrink: 0;
}
.btn-bic--activo {
  background: var(--turquesa-bri);
  border-color: var(--turquesa-bri);
  color: #000;
  box-shadow: 0 0 12px var(--turquesa-bri);
}

.anot {
  display: flex;
  align-items: center;
  gap: 5px;
}
.anot__punto {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  flex-shrink: 0;
  box-shadow: 0 0 5px currentColor;
}
.anot__linea {
  width: 20px;
  height: 1px;
  flex-shrink: 0;
}
.anot__texto {
  font-size: 0.62rem;
  color: var(--texto-2);
  line-height: 1.3;
  white-space: nowrap;
}

.sep-h {
  width: 100%;
  height: 1px;
  background: rgba(255,255,255,0.07);
}

/* ── Explicación estrellas ────────────────────────────── */
.estrellas-explicacion {
  background: rgba(255,255,255,0.03);
  border: 1px dashed rgba(34,211,238,0.2);
  border-radius: 12px;
  padding: 14px 16px;
  display: flex;
  gap: 14px;
  align-items: flex-start;
}
.estrellas-explicacion__icono { font-size: 1.4rem; flex-shrink: 0; line-height: 1; padding-top: 2px; }
.estrellas-explicacion__titulo {
  font-family: 'Orbitron', sans-serif;
  font-size: 0.56rem;
  font-weight: 700;
  color: var(--cian);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 6px;
}
.estrellas-explicacion__desc { font-size: 0.67rem; color: var(--texto-2); line-height: 1.5; margin-bottom: 10px; }
.estrellas-demo { display: flex; flex-wrap: wrap; gap: 12px; align-items: flex-end; }
.estrella-demo-item { display: flex; flex-direction: column; align-items: center; gap: 2px; }
.estrella-demo-item__star { font-size: 1.1rem; line-height: 1; }
.estrella-demo-item__num  { font-family: 'Orbitron', sans-serif; font-size: 0.44rem; font-weight: 700; }
.estrella-demo-item__desc { font-size: 0.5rem; color: var(--texto-3); text-align: center; max-width: 38px; }

/* ── Tips ─────────────────────────────────────────────── */
.tips { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.tip {
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.07);
  border-radius: 10px;
  padding: 10px 12px;
  display: flex;
  gap: 10px;
  align-items: flex-start;
}
.tip__icono  { font-size: 1rem; line-height: 1; flex-shrink: 0; }
.tip__titulo {
  font-family: 'Orbitron', sans-serif;
  font-size: 0.52rem;
  font-weight: 700;
  color: var(--cian);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 3px;
}
.tip__desc { font-size: 0.62rem; color: var(--texto-2); line-height: 1.4; }

/* ── Responsive ──────────────────────────────────────── */
@media (max-width: 640px) {
  .explicacion-ficha { padding: 0 12px 40px; }
  .boceto { padding: 22px 16px 24px; }
  .boceto__contenido { grid-template-columns: 1fr; gap: 20px; }
  .col-izq { flex-direction: column; align-items: center; gap: 16px; }
  .flecha-nav { display: none; }
  .carta-demo { width: 150px; }
  .bic-con-anot { flex-direction: column; gap: 5px; align-items: flex-start; }
  .anot__texto  { white-space: normal; font-size: 0.6rem; }
  .tips { grid-template-columns: 1fr; }
  .col-der > .sep-h:first-child { display: none; }
}

.explicacion-ficha__subtitulo {
  text-align: center;
  font-size: 0.78rem;
  color: var(--texto-3);
  letter-spacing: 0.08em;
  margin-top: -12px;
  margin-bottom: 20px;
}