/* ==========================================================================
   COSMORA · Base
   Reset leggero, tipografia, accessibilità trasversale, utility.
   ========================================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-padding-top: calc(var(--nav-h) + 1rem);
  background: var(--night-950);
}

@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100svh;
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  color: var(--text);
  /* niente background qui: il fondo è su <html>, altrimenti coprirebbe
     l'.aurora (z-index negativo) */
  overflow-wrap: break-word;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

img,
svg {
  display: block;
  max-width: 100%;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 500;
  line-height: var(--lh-tight);
  letter-spacing: var(--tracking-display);
  color: var(--text-strong);
  text-wrap: balance;
  overflow-wrap: break-word;
}

p {
  margin: 0;
  text-wrap: pretty;
}

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

a {
  color: inherit;
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.2em;
}

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

::selection {
  background: color-mix(in srgb, var(--aurora-violet) 55%, transparent);
  color: #fff;
}

/* ---------- Scrollbar ----------
   Binario notturno quasi invisibile, cursore di vetro con gradiente aurorale.
   Chromium/Safari: pseudo-elementi ::-webkit-scrollbar (permettono il
   gradiente). Firefox non sa fare gradienti nella scrollbar nativa: lì la
   scrollbar della pagina viene nascosta e ridisegnata da main.js
   (initScrollbar → .cs-scroll). Le scrollbar interne (textarea, tabelle)
   restano native, sottili e di un solo colore (scrollbar-color). */
::-webkit-scrollbar {
  width: 14px;
  height: 14px;
}

::-webkit-scrollbar-track {
  background: color-mix(in srgb, var(--night-950) 88%, transparent);
  box-shadow: inset 1px 0 0 rgb(255 255 255 / 0.06);
}

::-webkit-scrollbar-thumb {
  min-height: 3rem;
  border: 3px solid transparent;
  border-radius: var(--radius-pill);
  background:
    linear-gradient(180deg, var(--aurora-emerald), var(--aurora-sky) 40%, var(--aurora-violet) 75%, var(--aurora-magenta))
    padding-box;
  box-shadow: inset 0 0 0 1px rgb(255 255 255 / 0.28);
}

::-webkit-scrollbar-thumb:hover,
::-webkit-scrollbar-thumb:active {
  background:
    linear-gradient(180deg, #7ff0c2, #8fdcff 40%, #c1abff 75%, #ff9fe8)
    padding-box;
}

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

@supports not selector(::-webkit-scrollbar) {
  html,
  * {
    scrollbar-width: thin;
    scrollbar-color: color-mix(in srgb, var(--aurora-violet) 70%, var(--aurora-sky)) var(--night-950);
  }
}

/* Scrollbar disegnata (solo quando main.js la attiva: Firefox con mouse) */
html.custom-scrollbar {
  scrollbar-width: none;
}

.cs-scroll {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  z-index: 90;
  width: 14px;
  background: color-mix(in srgb, var(--night-950) 88%, transparent);
  box-shadow: inset 1px 0 0 rgb(255 255 255 / 0.06);
  touch-action: none;
  user-select: none;
}

.cs-scroll[hidden] {
  display: none;
}

.cs-scroll__rail {
  position: absolute;
  inset: 3px;
}

.cs-scroll__thumb {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  border-radius: var(--radius-pill);
  background: linear-gradient(180deg, var(--aurora-emerald), var(--aurora-sky) 40%, var(--aurora-violet) 75%, var(--aurora-magenta));
  box-shadow: inset 0 0 0 1px rgb(255 255 255 / 0.28);
  cursor: grab;
  will-change: transform;
}

.cs-scroll__thumb:hover,
.cs-scroll__thumb.is-dragging {
  background: linear-gradient(180deg, #7ff0c2, #8fdcff 40%, #c1abff 75%, #ff9fe8);
}

.cs-scroll__thumb.is-dragging {
  cursor: grabbing;
}

/* ---------- Focus visibile (sempre, da tastiera) ---------- */
:focus {
  outline: none;
}

:focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 3px;
  border-radius: var(--radius-xs);
}

/* ---------- Utility ---------- */
.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: var(--space-3);
  left: var(--space-3);
  z-index: var(--z-skip);
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-pill);
  background: var(--text-strong);
  color: var(--night-950);
  font-weight: 600;
  text-decoration: none;
  transform: translateY(-200%);
  transition: transform var(--dur-base) var(--ease-soft);
}

.skip-link:focus-visible {
  transform: none;
}

.text-gradient {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}

@media (forced-colors: active) {
  .text-gradient {
    background: none;
    color: CanvasText;
    -webkit-text-fill-color: currentColor;
  }
}

/* ---------- Movimento ridotto ----------
   Tutte le animazioni si spengono; gli elementi restano nello stato base. */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}