/* ==========================================================================
   SCUCITA - Design Tokens & Global CSS
   Accessibilità: Colori ad alto contrasto (WCAG AA), supporto reduced-motion,
   font fluidi e focus rings ad alta visibilità.
   ========================================================================== */

:root {
  /* Palette Colori Principale (Modificabile in base alle bozze Stitch) */
  --color-bg: #050505;
  --color-surface: #101010;
  --color-surface-hover: #1a1a1a;
  --color-border: #393939;
  
  --color-text-main: #f6f2ef;
  --color-text-muted: #d3ceca;
  --color-text-subtle: #a39d98;
  
  /* Colori di Accento */
  --color-accent: #ed1c2b;
  --color-accent-hover: #ff2635;
  --color-accent-contrast: #ffffff;
  
  --color-focus: #38bdf8; /* Focus indicator chiaramente visibile per A11y */

  /* Tipografia Fluida (clamp per scalabilità responsive senza media query ovunque) */
  --font-family-base: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-family-display: 'Amatic SC', 'Arial Narrow', var(--font-family-base);

  --font-size-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --font-size-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --font-size-base: clamp(1rem, 0.95rem + 0.3vw, 1.125rem);
  --font-size-lg: clamp(1.25rem, 1.15rem + 0.5vw, 1.5rem);
  --font-size-xl: clamp(1.75rem, 1.5rem + 1vw, 2.25rem);
  --font-size-2xl: clamp(2.25rem, 1.8rem + 2vw, 3.5rem);
  --font-size-hero: clamp(4.5rem, 3rem + 7vw, 8rem);

  /* Spaziature */
  --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: 4.5rem;
  --space-section: clamp(3.5rem, 2.5rem + 5vw, 7rem);

  /* Layout & Contenitori */
  --container-max-width: 1200px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 14px;
  --radius-full: 9999px;

  /* Transizioni */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  color-scheme: dark;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: 5rem;
}

[id] {
  scroll-margin-top: 5.5rem;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text-main);
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  line-height: 1.6;
  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;
  color: inherit;
}

/* Disabilita animazioni per utenti con preferenza reduced-motion (A11y) */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* Focus styles accessibili per navigazione da tastiera */
:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* Skip link per screen reader (salta al contenuto principale) */
.skip-link {
  position: absolute;
  top: var(--space-md);
  left: var(--space-md);
  background: var(--color-accent);
  color: var(--color-accent-contrast);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  text-decoration: none;
  font-weight: 600;
  z-index: 9999;
  transform: translateY(-200%);
  transition: transform var(--transition-fast);
}

.skip-link:focus {
  transform: translateY(0);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  clip-path: inset(50%);
}

/* --------------------------------------------------------------------------
   Utility Layout
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin-inline: auto;
  padding-inline: var(--space-md);
}

.section-wrapper {
  padding-block: var(--space-section);
}

.section-title {
  font-family: var(--font-family-display);
  font-size: clamp(2.5rem, 2rem + 3vw, 4.5rem);
  font-weight: 800;
  letter-spacing: 0.02em;
  margin-bottom: var(--space-xs);
}

.section-description {
  color: var(--color-text-muted);
  font-size: var(--font-size-base);
  max-width: 65ch;
  margin-bottom: var(--space-xl);
}

/* Bottoni accessibili con target di tocco minimo di 44px */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  min-height: 48px;
  padding-inline: var(--space-lg);
  font-weight: 600;
  font-size: var(--font-size-sm);
  text-decoration: none;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background-color: var(--color-accent);
  color: var(--color-accent-contrast);
}

.btn-primary:hover {
  background-color: var(--color-accent-hover);
}

.btn-secondary {
  background-color: var(--color-surface);
  color: var(--color-text-main);
  border-color: var(--color-border);
}

.btn-secondary:hover {
  background-color: var(--color-surface-hover);
  border-color: var(--color-text-subtle);
}