/* ============================================================
   theme.css — Sistema de diseño "Dark estudio" (compartido)
   Vanilla CSS, file:// safe. Enlazado por todas las páginas.
   Fuentes vendorizadas en ./assets/fonts (rutas relativas a ESTE css,
   así resuelven igual desde tools/ y desde tools/backing-track/).
   ============================================================ */

/* ── Fuentes vendorizadas (OFL) ── */
@font-face {
  font-family: 'Space Grotesk';
  font-style: normal; font-weight: 500; font-display: swap;
  src: url('./assets/fonts/SpaceGrotesk-Medium.woff2') format('woff2');
}
@font-face {
  font-family: 'Space Grotesk';
  font-style: normal; font-weight: 700; font-display: swap;
  src: url('./assets/fonts/SpaceGrotesk-Bold.woff2') format('woff2');
}
@font-face {
  font-family: 'JetBrains Mono';
  font-style: normal; font-weight: 500; font-display: swap;
  src: url('./assets/fonts/JetBrainsMono-Medium.woff2') format('woff2');
}
@font-face {
  font-family: 'JetBrains Mono';
  font-style: normal; font-weight: 700; font-display: swap;
  src: url('./assets/fonts/JetBrainsMono-Bold.woff2') format('woff2');
}

/* ── Tokens (única fuente de verdad) ── */
:root {
  /* Superficies dark-studio con elevación */
  --bg:        #0a0a0b;
  --bg-2:      #0d0d0f;
  --surface:   #121215;
  --surface2:  #17171b;
  --surface3:  #1e1e23;
  --border:    #26262d;
  --border2:   #34343d;

  /* Texto cálido (identidad conservada) */
  --text:      #ece3cf;
  --text-mid:  #a39d90;
  --text-dim:  #8a857a;

  /* Dorado de marca + acento por defecto */
  --gold:      #e0b24a;
  --accent:    var(--gold);

  /* Acentos por herramienta (sin oído) */
  --c-diapason: #e0b24a;
  --c-escalas:  #34d399;
  --c-acordes:  #4aa3f0;
  --c-atlas:    #f0c45f;
  --c-improv:   #2dd4bf;
  --c-backing:  #f0865f;

  /* Tipografía */
  --font-display: 'Space Grotesk', 'Segoe UI', system-ui, sans-serif;
  --font:         'Space Grotesk', 'Segoe UI', system-ui, sans-serif;
  --font-mono:    'JetBrains Mono', 'SFMono-Regular', ui-monospace, monospace;

  /* Escala tipográfica */
  --fs-display: clamp(34px, 6vw, 58px);
  --fs-h1:      clamp(26px, 4.5vw, 40px);
  --fs-h2:      clamp(18px, 2.4vw, 22px);
  --fs-body:    15px;
  --fs-small:   13px;
  --fs-micro:   11px;

  /* Espaciado */
  --sp-1: 4px;  --sp-2: 8px;  --sp-3: 12px; --sp-4: 16px;
  --sp-5: 24px; --sp-6: 32px; --sp-7: 48px; --sp-8: 64px;

  /* Radios */
  --radius-sm: 8px;
  --radius:    14px;
  --radius-lg: 20px;

  /* Sombras y glow */
  --shadow-1: 0 1px 0 rgba(255,255,255,0.03) inset, 0 8px 24px rgba(0,0,0,0.45);
  --shadow-2: 0 1px 0 rgba(255,255,255,0.04) inset, 0 18px 50px rgba(0,0,0,0.6);
  --glow:     color-mix(in srgb, var(--accent) 32%, transparent);

  /* Motion */
  --dur-fast: 120ms;
  --dur:      220ms;
  --ease:     cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ── Base ── */
* { box-sizing: border-box; }

body {
  margin: 0;
  background:
    radial-gradient(1100px 620px at 50% -8%,
      color-mix(in srgb, var(--accent) 9%, transparent), transparent 60%),
    radial-gradient(900px 500px at 100% 0%, rgba(255,255,255,0.018), transparent 55%),
    var(--bg);
  background-attachment: fixed;
  color: var(--text);
  font-family: var(--font);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { background: color-mix(in srgb, var(--accent) 40%, transparent); color: #fff; }

a { color: var(--accent); text-decoration: none; }

/* ── Foco accesible por teclado (global, sobrescribible por cada tool) ── */
a:focus-visible, button:focus-visible, select:focus-visible,
input:focus-visible, textarea:focus-visible, [tabindex]:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ── Header / back-link compartidos ── */
.header { text-align: center; }
.header-label {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.34em;
  text-transform: uppercase;
  color: var(--text-dim);
}
.header h1,
.header h1.header { /* algunas tools ponen h1 con clase */
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text);
}
.back, .back-link {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  color: var(--text-mid);
  letter-spacing: 0.04em;
  transition: color var(--dur) var(--ease), transform var(--dur-fast) var(--ease);
  display: inline-block;
}
.back:hover, .back-link:hover { color: var(--accent); transform: translateX(-2px); }

/* ── Footer / botones fantasma (portada + legales) ── */
footer { color: var(--text-dim); }
.footer-links a { color: var(--text-mid); transition: color var(--dur) var(--ease); }
.footer-links a:hover { color: var(--accent); }
.ghost-btn {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 10px 17px;
  background: var(--surface2);
  color: var(--text-mid);
  font-family: var(--font); font-size: var(--fs-small); font-weight: 500;
  letter-spacing: 0.03em;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease),
              transform var(--dur-fast) var(--ease), box-shadow var(--dur) var(--ease);
}
.ghost-btn:hover {
  border-color: color-mix(in srgb, var(--accent) 55%, var(--border));
  color: var(--text);
  transform: translateY(-2px);
  box-shadow: 0 8px 22px rgba(0,0,0,0.4);
}

/* ── Ícono inline (reemplaza emojis en botones/labels) ── */
.ico {
  width: 1.05em; height: 1.05em;
  flex: none;
  vertical-align: -0.16em;
  stroke: currentColor;
  fill: none;
}

/* ── Toggle EN/ES (la posición/tamaño base lo fija i18n.js) ── */
.i18n-toggle { font-family: var(--font-mono) !important; }

/* ── Reduce motion global ── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}