/* ==========================================================================
   BASE — reset minimale + tipografia globale + utility condivise
   ========================================================================== */

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

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

body {
    margin: 0;
    font-family: var(--font-body);
    font-size: var(--fs-base);
    font-weight: var(--fw-regular);
    line-height: var(--lh-relaxed);
    color: var(--color-ink-800);
    background-color: var(--color-bg-default);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-base);
}

button {
    font-family: inherit;
    cursor: pointer;
    border: 0;
    background: transparent;
    padding: 0;
    color: inherit;
}

input,
select,
textarea {
    font-family: inherit;
    font-size: inherit;
    color: inherit;
}

h1, h2, h3, h4, h5, h6 {
    margin: 0;
    font-family: var(--font-display);
    font-weight: var(--fw-light);
    line-height: var(--lh-tight);
    color: var(--color-ink-800);
}

p {
    margin: 0;
}

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

/* ---------- Focus visibile accessibile ----------
   Outline su --color-brand-text (non --color-brand) per rispettare WCAG
   1.4.11 Non-text Contrast (3:1 su sfondi chiari del sito). Vedi tokens.css. */
:focus-visible {
    outline: 2px solid var(--color-brand-text);
    outline-offset: 2px;
}

/* ---------- Skip link (WCAG 2.4.1 Bypass Blocks) ----------
   Primo elemento tabulabile della pagina: nascosto fuori viewport finche'
   non riceve focus, poi appare in alto a sinistra. Permette agli utenti
   tastiera/screen reader di saltare header e nav e atterrare su <main>. */
.skip-link {
    /* top: -100px (non -40px) per garantire che lo skip link resti
       interamente FUORI dal viewport indipendentemente da
       line-height + padding (che sommati superano i 40px). Pattern
       raccomandato WAI per skip link sliding. */
    position: absolute;
    top: -100px;
    left: var(--space-4);
    z-index: var(--z-toast);
    padding: var(--space-3) var(--space-5);
    background-color: var(--color-ink-800);
    color: var(--color-on-dark);
    font-family: var(--font-body);
    font-size: var(--fs-base);
    font-weight: var(--fw-medium);
    letter-spacing: var(--ls-wider);
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: top var(--transition-fast);
}

.skip-link:focus,
.skip-link:focus-visible {
    top: var(--space-4);
}

/* ---------- Lingua: elementi nascosti per lingua non attiva ---------- */
.lang-hidden {
    display: none !important;
}

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

/* ---------- Sezioni ---------- */
.section {
    padding-block: var(--space-20);
}

.section--tight {
    padding-block: var(--space-16);
}

/* ---------- Heading di sezione (eyebrow + titolo + paragrafo intro) ---------- */
.section-head {
    text-align: center;
    margin-bottom: var(--space-16);
}

.section-head--left {
    text-align: left;
}

.eyebrow {
    color: var(--color-brand-text);
    font-family: var(--font-body);
    font-size: var(--fs-xs);
    font-weight: var(--fw-medium);
    letter-spacing: var(--ls-eyebrow);
    text-transform: uppercase;
    margin-bottom: var(--space-4);
    display: block;
}

.section-title {
    font-family: var(--font-display);
    font-weight: var(--fw-light);
    font-size: var(--fs-3xl);
    color: var(--color-ink-800);
    margin-bottom: var(--space-6);
}

@media (min-width: 768px) {
    .section-title {
        font-size: var(--fs-4xl);
    }
}

.section-title em,
.section-title .italic {
    font-style: italic;
    font-weight: var(--fw-regular);
}

.section-lead {
    /* M-4: --color-ink-500 falliva 4.5:1 su --color-bg-warm (4.40:1).
       --color-ink-600 garantisce 7+:1 su tutti gli sfondi del sito. */
    color: var(--color-ink-600);
    font-weight: var(--fw-light);
    max-width: 36rem;
    margin-inline: auto;
}

.section-head--left .section-lead {
    margin-inline: 0;
}

/* ---------- Bottoni ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-body);
    font-size: var(--fs-base);
    font-weight: var(--fw-regular);
    letter-spacing: var(--ls-widest);
    text-transform: uppercase;
    padding: var(--space-4) var(--space-10);
    border: 1px solid transparent;
    cursor: pointer;
    transition: background-color var(--transition-base),
                color var(--transition-base),
                border-color var(--transition-base);
    text-align: center;
    line-height: 1;
    white-space: nowrap;
}

.btn--primary {
    /* C-3: testo bianco su --color-brand falliva 4.5:1 (2.24:1). Lo sfondo
       passa al tono testuale --color-brand-text che mantiene il colore brand
       ma scurito quanto basta per la conformita' AA. */
    background-color: var(--color-brand-text);
    color: var(--color-on-dark);
}

.btn--primary:hover,
.btn--primary:focus-visible {
    background-color: var(--color-brand-text-hover);
    color: var(--color-on-dark);
}

.btn--outline {
    background-color: transparent;
    color: var(--color-ink-800);
    border-color: var(--color-ink-800);
}

.btn--outline:hover,
.btn--outline:focus-visible {
    background-color: var(--color-ink-800);
    color: var(--color-on-dark);
}

.btn--dark {
    background-color: var(--color-ink-800);
    color: var(--color-on-dark);
}

.btn--dark:hover,
.btn--dark:focus-visible {
    background-color: #404040;
}

/* ---------- Error page ---------- */
.error-page__inner {
    text-align: center;
    max-width: 40rem;
    margin-inline: auto;
}

.error-page__inner .section-lead {
    margin-bottom: var(--space-8);
}

.error-page__request-id {
    color: var(--color-ink-500);
    font-size: var(--fs-sm);
    margin-bottom: var(--space-8);
}

.error-page__request-id code {
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 0.95em;
}

.error-page__actions {
    margin-top: var(--space-6);
}

.error-page__dev {
    margin-top: var(--space-16);
    padding: var(--space-6);
    background-color: var(--color-bg-warm);
    text-align: left;
    font-size: var(--fs-sm);
}

/* ---------- Utility ---------- */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}