/* ==========================================================================
   Documentazione modulo di prenotazione — foglio di stile della pagina
   ========================================================================== */

:root
{
    --ink:         #101720;
    --ink-soft:    #4a5563;
    --ink-faint:   #8b95a3;
    --carta:       #f2f4f6;
    --bianco:      #ffffff;
    --linea:       #dde2e8;
    --linea-forte: #c3ccd6;

    --tinta:       #23883f;

    --rail:        15rem;
    --gutter:      4.5rem;
}

*
{
    box-sizing: border-box;
}

html
{
    scroll-behavior: smooth;
    scroll-padding-top: 2rem;
}

body
{
    margin: 0;
    background: var(--carta);
    color: var(--ink);
    font-family: 'IBM Plex Sans', system-ui, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4
{
    font-family: 'IBM Plex Sans Condensed', 'IBM Plex Sans', sans-serif;
    font-weight: 600;
    letter-spacing: -0.01em;
    line-height: 1.12;
    margin: 0;
}

p
{
    margin: 0 0 1rem;
}

a
{
    color: inherit;
}

code, .mono
{
    font-family: 'IBM Plex Mono', ui-monospace, monospace;
}

:focus-visible
{
    outline: 2px solid var(--tinta);
    outline-offset: 3px;
}

/* --------------------------------------------------------------- impianto */

.impianto
{
    display: grid;
    grid-template-columns: var(--rail) minmax(0, 1fr);
    align-items: start;
}

.contenuto
{
    padding: 0 3rem 8rem;
}

/* ------------------------------------------------------------------- rail */

.rail
{
    position: sticky;
    top: 0;
    height: 100vh;
    padding: 2.5rem 1.5rem;
    border-right: 1px solid var(--linea);
    background: var(--bianco);
    display: flex;
    flex-direction: column;
    gap: 2rem;
    overflow-y: auto;
}

.rail-marchio
{
    font-family: 'IBM Plex Sans Condensed', sans-serif;
    font-weight: 700;
    font-size: 1.05rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    line-height: 1.25;
    border-left: 3px solid var(--tinta);
    padding-left: 0.75rem;
}

.rail-marchio span
{
    display: block;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.6875rem;
    font-weight: 400;
    letter-spacing: 0.04em;
    text-transform: none;
    color: var(--ink-faint);
    margin-top: 0.35rem;
}

.rail-indice
{
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
}

.rail-indice a
{
    display: flex;
    align-items: baseline;
    gap: 0.6rem;
    padding: 0.4rem 0.55rem;
    border-radius: 3px;
    text-decoration: none;
    font-size: 0.875rem;
    color: var(--ink-soft);
    border-left: 2px solid transparent;
}

.rail-indice a:hover
{
    background: var(--carta);
    color: var(--ink);
}

.rail-indice a.attivo
{
    color: var(--ink);
    font-weight: 500;
    border-left-color: var(--tinta);
    background: var(--carta);
}

.rail-indice .sigla
{
    flex: 0 0 auto;
    white-space: nowrap;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.6875rem;
    color: var(--tinta);
}

.rail-nota
{
    margin-top: auto;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.6875rem;
    line-height: 1.6;
    color: var(--ink-faint);
}

/* ------------------------------------------------------------------- hero */

.hero
{
    padding: 6rem 0 3.5rem;
}

.hero-occhiello
{
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.75rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--tinta);
    margin-bottom: 1.5rem;
}

.hero h1
{
    font-size: clamp(2.5rem, 5.5vw, 4rem);
    font-weight: 700;
}

.hero-testo
{
    margin-top: 1.75rem;
    font-size: 1.0625rem;
    color: var(--ink-soft);
}

.specbar
{
    display: flex;
    flex-wrap: wrap;
    gap: 0 2.5rem;
    margin-top: 2.5rem;
    padding-top: 1.25rem;
    border-top: 1px solid var(--linea);
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.75rem;
    color: var(--ink-soft);
}

.specbar b
{
    color: var(--ink-faint);
    font-weight: 400;
    margin-right: 0.5rem;
}

/* ----------------------------------------------------------------- sezione */

.sezione
{
    padding-top: var(--gutter);
}

.sezione-titolo
{
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.75rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--ink-faint);
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--linea);
    margin-bottom: 2rem;
}

.sezione-intro
{
    margin: -0.75rem 0 2.25rem;
    color: var(--ink-soft);
}

/* ------------------------------------------------------------- flusso step */

.flusso
{
    display: flex;
    flex-direction: column;
}

.passo
{
    display: grid;
    grid-template-columns: 4.5rem minmax(0, 1fr);
    column-gap: 1.5rem;
}

.passo-indice
{
    position: relative;
    display: flex;
    justify-content: center;
}

.passo-indice::before
{
    content: '';
    position: absolute;
    top: 0;
    bottom: -0.1rem;
    left: 50%;
    width: 1px;
    background: var(--linea-forte);
}

.passo:last-child .passo-indice::before
{
    bottom: auto;
    height: 2.75rem;
}

.passo-numero
{
    position: relative;
    z-index: 1;
    width: 2.75rem;
    height: 2.75rem;
    border-radius: 50%;
    background: var(--tinta);
    color: #fff;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.9375rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.passo-corpo
{
    padding-bottom: 3rem;
}

.passo-corpo h4
{
    font-size: 1.25rem;
    margin-top: 0.4rem;
}

.passo-corpo p
{
    margin: 0.5rem 0 1.25rem;
    color: var(--ink-soft);
}

/* -------------------------------------------------------------- schermate */

.scatto
{
    display: block;
    width: 100%;
    padding: 0;
    border: 1px solid var(--linea);
    background: var(--bianco);
    cursor: zoom-in;
    line-height: 0;
}

.scatto:hover
{
    border-color: var(--tinta);
}

.scatto img
{
    display: block;
    width: 100%;
    height: auto;
}

.griglia-scatti
{
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(20rem, 1fr));
    gap: 2.5rem 2rem;
}

.scatto-voce h4
{
    font-size: 1.0625rem;
    margin-bottom: 0.4rem;
}

.scatto-voce p
{
    font-size: 0.9375rem;
    color: var(--ink-soft);
    margin-bottom: 1rem;
}

/* ------------------------------------------------------------ installazione */

.installa
{
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 2.5rem;
    align-items: start;
}

.codice
{
    background: var(--ink);
    color: #e8edf4;
    padding: 1.25rem;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.8125rem;
    line-height: 1.7;
    margin: 0 0 1rem;
    white-space: pre-wrap;
    word-break: break-word;
}

.installa em
{
    font-style: normal;
    font-size: 0.875rem;
    color: var(--ink-faint);
}

.passi-installa
{
    counter-reset: pi;
    list-style: none;
    margin: 0;
    padding: 0;
}

.passi-installa li
{
    counter-increment: pi;
    position: relative;
    padding-left: 2rem;
    margin-bottom: 0.85rem;
    color: var(--ink-soft);
    font-size: 0.9375rem;
}

.passi-installa li::before
{
    content: counter(pi, decimal-leading-zero);
    position: absolute;
    left: 0;
    top: 0.1rem;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.75rem;
    color: var(--tinta);
}

/* ---------------------------------------------------------- scheda tecnica */

.tecnica
{
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9375rem;
}

.tecnica th,
.tecnica td
{
    text-align: left;
    vertical-align: top;
    padding: 0.7rem 1rem 0.7rem 0;
    border-bottom: 1px solid var(--linea);
}

.tecnica th
{
    width: 16rem;
    font-weight: 400;
    color: var(--ink-faint);
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.8125rem;
}

.tecnica td
{
    color: var(--ink-soft);
}

/* ------------------------------------------------------------------ elenco */

.elenco
{
    list-style: none;
    margin: 0;
    padding: 0;
    columns: 3;
    column-gap: 3rem;
}

.elenco li
{
    break-inside: avoid;
    position: relative;
    padding-left: 1.25rem;
    margin-bottom: 0.7rem;
    font-size: 0.9375rem;
    color: var(--ink-soft);
}

.elenco li::before
{
    content: '';
    position: absolute;
    left: 0;
    top: 0.65rem;
    width: 0.5rem;
    height: 1px;
    background: var(--tinta);
}

/* ------------------------------------------------------------------- chiusa */

.chiusa
{
    margin-top: var(--gutter);
    padding-top: 2rem;
    border-top: 1px solid var(--linea);
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.75rem;
    color: var(--ink-faint);
}

/* ---------------------------------------------------------------- lightbox */

.lente
{
    position: fixed;
    inset: 0;
    background: rgba(16, 23, 32, 0.94);
    display: none;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    z-index: 50;
    cursor: zoom-out;
}

.lente.aperta
{
    display: flex;
}

.lente img
{
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    border: 1px solid rgba(255, 255, 255, 0.15);
}

.lente-chiudi
{
    position: absolute;
    top: 1.25rem;
    right: 1.5rem;
    background: none;
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: #fff;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    padding: 0.5rem 0.9rem;
    cursor: pointer;
}

.lente-chiudi:hover
{
    border-color: #fff;
}

/* ------------------------------------------------------------- responsive */

@media (max-width: 1100px)
{
    .installa
    {
        grid-template-columns: minmax(0, 1fr);
    }

    .elenco
    {
        columns: 1;
    }
}

@media (max-width: 900px)
{
    .impianto
    {
        grid-template-columns: minmax(0, 1fr);
    }

    .rail
    {
        position: static;
        height: auto;
        border-right: none;
        border-bottom: 1px solid var(--linea);
    }

    .rail-indice
    {
        flex-direction: row;
        flex-wrap: wrap;
    }

    .rail-nota
    {
        display: none;
    }

    .contenuto
    {
        padding: 0 1.5rem 5rem;
    }

    .hero
    {
        padding-top: 3rem;
    }

    .passo
    {
        grid-template-columns: 2.75rem minmax(0, 1fr);
        column-gap: 1rem;
    }

    .passo-numero
    {
        width: 2.25rem;
        height: 2.25rem;
        font-size: 0.8125rem;
    }
}

@media (prefers-reduced-motion: reduce)
{
    html
    {
        scroll-behavior: auto;
    }
}

/* ------------------------------------------------- hero: titolo e spaziature */

.hero
{
    padding: 3rem 0 0;
}

.hero-occhiello
{
    margin-bottom: 1rem;
    font-size: 0.875rem;
}

.hero h1
{
    font-size: clamp(1.625rem, 3vw, 2.25rem);
}

.hero-testo
{
    margin: 1rem 0 0;
}

.specbar
{
    margin-top: 1.5rem;
    font-size: 0.875rem;
}

/* ------------------------------------------- dimensione minima del testo: 14px */

.rail-marchio span,
.rail-indice .sigla,
.rail-nota,
.sezione-titolo,
.codice,
.passi-installa li::before,
.tecnica th,
.chiusa,
.lente-chiudi
{
    font-size: 0.875rem;
}

.passo-numero
{
    font-size: 0.9375rem;
}

/* --------------------------------------------------- box dei punti chiave */

.text-accent
{
    color: var(--tinta);
}