/* ==========================================================================
   Design Tokens & Variables Globales - Studio PRO / Luxury Dark & Light
   ========================================================================== */
:root {
  /* Curvas Físicas de Alto Rendimiento (Apple / Linear Grade) */
  --ease-spring: cubic-bezier(0.16, 1, 0.3, 1);      /* Entrada rápida y asentamiento ultra suave */
  --ease-exit: cubic-bezier(0.7, 0, 0.84, 0);        /* Aceleración inmediata en cierre */
  --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);   /* Micro-rebote elástico táctil */
  --ease-smooth: cubic-bezier(0.25, 1, 0.5, 1);

  /* Duraciones Físicas */
  --duration-instant: 80ms;
  --duration-fast: 150ms;
  --duration-normal: 260ms;
  --duration-slow: 400ms;

  /* Transiciones */
  --transition-fast: var(--duration-fast) var(--ease-spring);
  --transition-normal: var(--duration-normal) var(--ease-spring);
  --transition-tactile: transform var(--duration-instant) var(--ease-spring), background var(--duration-fast) ease, box-shadow var(--duration-fast) ease;
  --transition-spring: background-color var(--duration-normal) var(--ease-spring), border-color var(--duration-normal) var(--ease-spring), color var(--duration-normal) var(--ease-spring), box-shadow var(--duration-normal) var(--ease-spring), opacity var(--duration-normal) var(--ease-spring), transform var(--duration-normal) var(--ease-spring);
  --transition-modal: transform var(--duration-normal) var(--ease-spring), opacity var(--duration-normal) var(--ease-spring);
  
  /* Tipografía */
  --font-serif: var(--font-sans);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --font-main: var(--font-sans);

  /* Dimensiones */
  --topbar-height: 58px;
  --songbar-height: 42px;
  --sidebar-width: 340px;
  --content-max: 1440px;
  --reading-max: 980px;
  --control-height: 44px;
  --control-height-compact: 36px;

  /* Geometría compartida */
  --radius-xs: 4px;
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 8px;
  --radius-xl: 8px;
  --radius-2xl: 8px;
  --radius-pill: 9999px;
  --radius-full: 50%;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;

  /* Resplandores y Sombras Globales */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
  --shadow-sheet: 0 20px 60px rgba(0, 0, 0, 0.65);
}

/* =========================================================
   THEME CHARCOAL (OLED / Dark Mode) - DEFAULT
   ========================================================= */
body, body.theme-charcoal {
  /* Fondos Principales */
  --bg-app: #101616;
  --bg-surface: #172020;
  --bg-surface-solid: #172020;
  --bg-surface-raised: #212c2c;
  --bg-surface-hover: #2c3939;
  --bg-viewport: #101616;
  --bg-paper: #172020;
  --bg-card-subtle: #1c2727;

  /* Glassmorphism con Reflejo Especular */
  --glass-blur: none;
  --glass-border: rgba(255, 255, 255, 0.08);
  --glass-border-hover: rgba(255, 255, 255, 0.18);
  --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.5);
  --glass-specular: inset 0 1px 0 rgba(255, 255, 255, 0.12);

  /* Acentos Vibrantes */
  --accent-primary: #65d6bb; /* Deep Orange */
  --accent-primary-hover: #8ae6d0;
  --accent-primary-glow: rgba(255, 87, 34, 0.4);
  --accent-secondary: #ffb4a5; /* Cyan */
  --accent-secondary-glow: rgba(0, 229, 255, 0.4);
  --accent-amber: #ebbf66;
  
  /* Texto (Alto Contraste) */
  --text-primary: #ffffff;
  --text-secondary: #c0cecc;
  --text-muted: #a4b6b2;
  --text-inverse: #000000;

  /* Bordes */
  --border-subtle: rgba(255, 255, 255, 0.1);
  --border-strong: rgba(255, 255, 255, 0.2);
  --focus-ring: rgba(0, 229, 255, 0.32);
  --status-success: #45c486;
  --status-warning: #ffbf47;
  --status-danger: #ff6b61;

  /* Diagramas de Acordes y Voicings (Alto Contraste Modo Oscuro) */
  --chord-fret-color: rgba(255, 255, 255, 0.45);
  --chord-string-color: rgba(255, 255, 255, 0.85);
  --chord-nut-color: #ffffff;
  --piano-white-key: #ffffff;
  --piano-black-key: #141420;
  --chord-diagram-bg: rgba(255, 255, 255, 0.04);

  background-color: var(--bg-app);
  color: var(--text-primary);
}

/* =========================================================
   THEME IVORY (Paper / Claude Design / Natural)
   ========================================================= */
body.theme-ivory {
  /* Fondos Principales (Cálidos, naturales tipo Anthropic/Claude) */
  --bg-app: #f2f5f5;
  --bg-surface: #ffffff;
  --bg-surface-solid: #ffffff;
  --bg-surface-raised: #f5f7f7;
  --bg-surface-hover: #e7efed;
  --bg-viewport: #f2f5f5;
  --bg-paper: #ffffff;
  --bg-card-subtle: #f5f7f7;

  /* Sombra Natural Suave (0 glow artificial) */
  --glass-blur: none;
  --glass-border: rgba(0, 0, 0, 0.06);
  --glass-border-hover: rgba(0, 0, 0, 0.12);
  --glass-shadow: 0 1px 3px rgba(0, 0, 0, 0.05), 0 4px 12px rgba(0, 0, 0, 0.03);
  --glass-specular: inset 0 1px 0 rgba(255, 255, 255, 0.7);

  /* Acentos Elegantes (Terracota Natural) */
  --accent-primary: #087466;
  --accent-primary-hover: #065e53;
  --accent-primary-glow: rgba(218, 119, 86, 0.15);
  --accent-secondary: #a73d51; /* Verde musgo suave */
  --accent-secondary-glow: rgba(90, 107, 92, 0.15);
  --accent-amber: #8a5900;
  
  /* Texto (Marrón muy oscuro, elegante y legible) */
  --text-primary: #172b2a;
  --text-secondary: #425957;
  --text-muted: #526965;
  --text-inverse: #ffffff;

  /* Bordes sutiles y limpios */
  --border-subtle: rgba(0, 0, 0, 0.08);
  --border-strong: rgba(0, 0, 0, 0.15);
  --focus-ring: rgba(181, 72, 38, 0.22);
  --status-success: #176b45;
  --status-warning: #8a5a00;
  --status-danger: #a92f27;

  /* Diagramas en Ivory */
  --chord-fret-color: rgba(0, 0, 0, 0.3);
  --chord-string-color: rgba(0, 0, 0, 0.75);
  --chord-nut-color: #172b2a;
  --piano-white-key: #ffffff;
  --piano-black-key: #172b2a;
  --chord-diagram-bg: rgba(0, 0, 0, 0.03);

  background-color: var(--bg-app);
  color: var(--text-primary);
}

/* =========================================================
   THEME AMBER (Stage Warm / Anti-Fatigue Mode)
   ========================================================= */
body.theme-amber {
  /* Fondos Principales Cálidos */
  --bg-app: #120e0a;
  --bg-surface: #1a140f;
  --bg-surface-solid: #211a13;
  --bg-surface-raised: #2a2118;
  --bg-surface-hover: #352a1f;
  --bg-viewport: #17110c;
  --bg-paper: #211a13;
  --bg-card-subtle: #241c14;

  /* Glassmorphism Cálido */
  --glass-blur: blur(20px) saturate(160%);
  --glass-border: rgba(255, 183, 77, 0.12);
  --glass-border-hover: rgba(255, 183, 77, 0.25);
  --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.6);
  --glass-specular: inset 0 1px 0 rgba(255, 183, 77, 0.18);

  /* Acentos Ámbar Brillantes */
  --accent-primary: #ff9800; /* Warm Amber */
  --accent-primary-hover: #ffa726;
  --accent-primary-glow: rgba(255, 152, 0, 0.45);
  --accent-secondary: #ffd54f;
  --accent-secondary-glow: rgba(255, 213, 79, 0.35);
  --accent-amber: #ebbf66;

  /* Texto Cálido de Alto Contraste */
  --text-primary: #fff8e1;
  --text-secondary: #d7ccc8;
  --text-muted: #c2ada1;
  --text-inverse: #120e0a;

  /* Bordes */
  --border-subtle: rgba(255, 183, 77, 0.12);
  --border-strong: rgba(255, 183, 77, 0.25);
  --focus-ring: rgba(255, 213, 79, 0.3);
  --status-success: #9ed9a4;
  --status-warning: #ffd166;
  --status-danger: #ff8b7f;

  /* Diagramas en Amber */
  --chord-fret-color: rgba(255, 183, 77, 0.45);
  --chord-string-color: rgba(255, 248, 225, 0.85);
  --chord-nut-color: #fff8e1;
  --piano-white-key: #2d2419;
  --piano-black-key: #0f0c08;
  --chord-diagram-bg: rgba(255, 183, 77, 0.05);

  background-color: var(--bg-app);
  color: var(--text-primary);
}

/* =========================================================
   REGLA UNIVERSAL DE TACTILIDAD Y FOCO ACCESIBLE
   ========================================================= */
button:active:not(:disabled),
.btn:active:not(:disabled),
.nav-tab-btn:active,
.genre-card-item:active,
.genre-chip:active,
.song-card:active,
.btn-string-pitch:active,
.btn-root:active,
.btn-type:active,
.btn-tuner-pitch:active,
.btn-bpm-step:active,
.btn-tap-tempo:active,
.btn-metronome-play:active,
.btn-ear-choice:active,
.btn-ear-answer:active:not(:disabled),
.btn-pitch-pipe-key:active,
.btn-stage-exit:active,
.btn-stage-autoscroll:active,
.btn-transpose-step:active,
.btn-font-scale-step:active,
.btn-autoscroll-step-btn:active,
.btn-autoscroll-toggle:active,
.chord-badge:active,
.btn-close-modal:active,
.btn-close-tuner:active,
.btn-popover-x-close:active,
.cmd-item:active {
  transform: scale(0.96) !important;
  transition: transform var(--duration-instant) var(--ease-spring) !important;
}

*:focus-visible {
  outline: 2px solid var(--accent-secondary) !important;
  outline-offset: 2px !important;
  box-shadow: 0 0 0 4px var(--focus-ring) !important;
}

button,
input,
select,
textarea {
  font: inherit;
}

button:disabled,
[aria-disabled="true"] {
  cursor: not-allowed;
  opacity: 0.56;
}

::selection {
  color: var(--text-inverse);
  background: var(--accent-primary);
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}
/* Scrollbars Minimalistas de Estudio */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: 10px;
  transition: background 0.2s ease;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent-primary);
}

* {
  scrollbar-width: thin;
  scrollbar-color: var(--border-strong) transparent;
}