/**
 * ==============================================================================
 * EXPERTOS TIC ENGINEERING STANDARD (ETAES)
 * Archivo: public/css/base.css
 * Propósito: Estilos base, resets, tipografía fluida y animaciones del sistema.
 * Responsabilidad: Garantizar consistencia visual, accesibilidad e interactividad.
 * Dependencias: public/css/variables.css
 * Autor: Carlos Londoño – EXPERTOS TIC
 * Proyecto: ViralCTR AI - Generador de Titulares YouTube con Alto CTR
 * ==============================================================================
 */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-app);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Tipografía Responsiva con clamp() */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--text-primary);
  font-weight: 700;
  line-height: 1.25;
}

h1 {
  font-size: clamp(1.75rem, 4vw + 1rem, 2.75rem);
  letter-spacing: -0.025em;
}

h2 {
  font-size: clamp(1.35rem, 2.5vw + 0.5rem, 1.85rem);
  letter-spacing: -0.02em;
}

h3 {
  font-size: clamp(1.1rem, 1.8vw + 0.3rem, 1.35rem);
}

p {
  color: var(--text-secondary);
  font-size: clamp(0.925rem, 1vw + 0.5rem, 1.05rem);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-hover);
}

button, input, select, textarea {
  font-family: inherit;
  font-size: 1rem;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  outline: none;
}

/* Enfoque accesible por teclado (WCAG 2.1 AA) */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Barras de desplazamiento estilizadas */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-app);
}

::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* ==============================================================================
 * ANIMACIONES MODERNAS
 * ============================================================================== */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulseGlow {
  0%, 100% {
    box-shadow: 0 0 15px rgba(59, 130, 246, 0.2);
  }
  50% {
    box-shadow: 0 0 25px rgba(139, 92, 246, 0.4);
  }
}

@keyframes shimmer {
  0% {
    background-position: -200% 0;
  }
  100% {
    background-position: 200% 0;
  }
}

@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

.animate-fade-in {
  animation: fadeIn 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

/* Contenedor principal responsive */
.container {
  width: 100%;
  max-width: 1240px;
  margin-left: auto;
  margin-right: auto;
  padding-left: clamp(1rem, 3vw, 2rem);
  padding-right: clamp(1rem, 3vw, 2rem);
}