/* css/variables.css */

/* Modern CSS Reset */
*, *::before, *::after {
  box-sizing: border-box;
}

* {
  margin: 0;
  padding: 0;
}

body {
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

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

p, h1, h2, h3, h4, h5, h6 {
  overflow-wrap: break-word;
}

/* Classical Serif & Clean Sans Fonts from Google Fonts - Cormorant Garamond for titles, Inter for body */
@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:ital,wght@0,400;0,600;0,700;1,400&family=Inter:wght@300;400;500;600;700&family=Plus+Jakarta+Sans:wght@300;400;500;600;700&display=swap');

:root {
  /* Primo Librerío - Light Mode (Default: Book Page Cream & Nacional Crimson Red) */
  --bg-primary: hsl(38, 40%, 96%);       /* Papel crema antiguo */
  --bg-secondary: hsl(38, 30%, 90%);     /* Beige pergamino */
  --bg-tertiary: hsl(38, 20%, 84%);      /* Pergamino oscuro */
  --text-primary: hsl(24, 25%, 12%);      /* Tinta café espresso */
  --text-secondary: hsl(24, 15%, 25%);    /* Carbón vegetal */
  --text-muted: hsl(24, 10%, 45%);       /* Tinta deslavada */
  
  --color-accent: hsl(350, 75%, 35%);      /* Rojo carmesí de Librería Nacional */
  --color-accent-hover: hsl(350, 85%, 40%);
  --color-accent-light: hsla(350, 75%, 35%, 0.12);
  
  --color-secondary: hsl(90, 15%, 35%);   /* Verde oliva encuadernación */
  --color-secondary-hover: hsl(90, 20%, 40%);
  --color-secondary-light: hsla(90, 15%, 35%, 0.12);

  --font-title: 'Cormorant Garamond', 'Playfair Display', serif;
  --font-body: 'Inter', 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;

  /* Global variables (Crisp, sharp book-like corners, Transitions, Spacing) */
  --color-success: hsl(120, 40%, 35%);
  --color-badge-preventa: hsl(175, 75%, 40%); /* Turquesa Preventa */
  --color-error: hsl(0, 70%, 40%);
  --border-color: hsl(38, 30%, 80%);
  --shadow-color: rgba(60, 40, 20, 0.08);

  --space-2xs: 0.25rem;
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* Classic sharp corners */
  --radius-sm: 2px;
  --radius-md: 4px;
  --radius-lg: 8px;
  --radius-xl: 12px;
  --radius-round: 50%;

  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);

  --max-width-content: 1200px;
  --header-height: 120px; /* Double-tier header height */
}

/* Primo Librerío - Dark Mode (Tinta & Carbón) */
[data-theme="dark"] {
  --bg-primary: hsl(240, 10%, 8%);       /* Carbón oscuro */
  --bg-secondary: hsl(240, 8%, 12%);     /* Carbón intermedio */
  --bg-tertiary: hsl(240, 6%, 16%);      /* Carbón claro */
  --text-primary: hsl(38, 40%, 90%);      /* Pergamino crema */
  --text-secondary: hsl(38, 25%, 75%);    /* Pergamino apagado */
  --text-muted: hsl(240, 5%, 55%);
  
  --color-accent: hsl(350, 85%, 45%);      /* Rojo brillante */
  --color-accent-hover: hsl(350, 95%, 50%);
  --color-accent-light: hsla(350, 85%, 45%, 0.15);
  
  --color-secondary: hsl(90, 20%, 60%);   /* Oliva claro */
  --color-secondary-hover: hsl(90, 25%, 65%);
  --color-secondary-light: hsla(90, 20%, 60%, 0.15);

  --border-color: hsl(240, 8%, 20%);
  --shadow-color: rgba(0, 0, 0, 0.4);
}

/* Focus States for Accessibility (WCAG 2.1 AA) */
:focus-visible {
  outline: 3px solid var(--color-secondary);
  outline-offset: 4px;
}

/* Accessibility: Reduce Motion Preferences */
@media (prefers-reduced-motion: reduce) {
  *, ::before, ::after {
    animation-delay: -1ms !important;
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
    background-attachment: initial !important;
    scroll-behavior: auto !important;
    transition-duration: 0s !important;
    transition-delay: 0s !important;
  }
}