/* ==========================================================================
   AnB – sito autore
   Stessa famiglia di ModbusKit (grigio quadro elettrico, inchiostro, blu del neutro),
   con il linguaggio della tavola tecnica: ogni pagina è un foglio con cornice e cartiglio.
   I valori dei colori sono gli stessi di src/ModbusKit.Web/wwwroot/css/app.css:
   se cambiano lì, vanno aggiornati anche qui.
   ========================================================================== */

/* --- Font ospitati sul sito (SIL Open Font License, vedi /assets/fonts) ---- */

@font-face {
    font-family: "Barlow";
    src: url("../fonts/barlow-latin-400-normal.woff2") format("woff2");
    font-weight: 400;
    font-display: swap;
}

@font-face {
    font-family: "Barlow";
    src: url("../fonts/barlow-latin-500-normal.woff2") format("woff2");
    font-weight: 500;
    font-display: swap;
}

@font-face {
    font-family: "Barlow";
    src: url("../fonts/barlow-latin-600-normal.woff2") format("woff2");
    font-weight: 600;
    font-display: swap;
}

@font-face {
    font-family: "Barlow Semi Condensed";
    src: url("../fonts/barlow-semi-condensed-latin-600-normal.woff2") format("woff2");
    font-weight: 600;
    font-display: swap;
}

@font-face {
    font-family: "Barlow Semi Condensed";
    src: url("../fonts/barlow-semi-condensed-latin-700-normal.woff2") format("woff2");
    font-weight: 700;
    font-display: swap;
}

@font-face {
    font-family: "JetBrains Mono";
    src: url("../fonts/jetbrains-mono-latin-400-normal.woff2") format("woff2");
    font-weight: 400;
    font-display: swap;
}

@font-face {
    font-family: "JetBrains Mono";
    src: url("../fonts/jetbrains-mono-latin-500-normal.woff2") format("woff2");
    font-weight: 500;
    font-display: swap;
}

/* --- Token --------------------------------------------------------------- */

:root {
    color-scheme: light;

    --color-page: #dfe2df;
    --color-surface: #f6f7f5;
    --color-panel: #eceeeb;
    --color-ink: #1e272c;
    --color-ink-muted: #4e5a60;
    --color-rule: #c9cec9;
    --color-rule-strong: #9aa39d;
    --color-frame: #2c363b;
    --color-grid: rgba(30, 39, 44, 0.055);
    --color-accent: #1f57a8;
    --color-accent-hover: #17468a;
    --color-on-accent: #ffffff;
    --color-dimension: #7d8882;
    --color-match-surface: #dce6f4;

    --font-body: "Barlow", "Segoe UI", system-ui, sans-serif;
    --font-display: "Barlow Semi Condensed", "Barlow", "Segoe UI", system-ui, sans-serif;
    --font-mono: "JetBrains Mono", "Cascadia Mono", Consolas, monospace;

    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.5rem;
    --space-6: 2.5rem;
    --space-7: 4rem;

    --radius-s: 4px;
    --radius-m: 6px;

    --sheet-width: 74rem;
    --sheet-pad: 2.5rem;
}

@media (prefers-color-scheme: dark) {
    :root {
        color-scheme: dark;

        --color-page: #161b1e;
        --color-surface: #1e2428;
        --color-panel: #262d32;
        --color-ink: #e4e7e5;
        --color-ink-muted: #a4aeb2;
        --color-rule: #333c41;
        --color-rule-strong: #4d585e;
        --color-frame: #6f7b80;
        --color-grid: rgba(228, 231, 229, 0.035);
        --color-accent: #79a6ea;
        --color-accent-hover: #9cbdf0;
        --color-on-accent: #0f1a2b;
        --color-dimension: #7c878c;
        --color-match-surface: #22344d;
    }
}

/* --- Base ---------------------------------------------------------------- */

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

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

/* Il piano di lavoro: grigio con la quadrettatura leggera della carta tecnica. */
body {
    margin: 0;
    background-color: var(--color-page);
    background-image:
        linear-gradient(var(--color-grid) 1px, transparent 1px),
        linear-gradient(90deg, var(--color-grid) 1px, transparent 1px);
    background-size: 24px 24px;
    color: var(--color-ink);
    font-family: var(--font-body);
    font-size: 1.0625rem;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: 1.12;
    color: var(--color-ink);
}

h2 {
    font-size: 1.75rem;
    margin: 0 0 var(--space-4);
}

h3 {
    font-size: 1.25rem;
}

p {
    margin: 0 0 var(--space-4);
}

a {
    color: var(--color-accent);
    text-underline-offset: 0.18em;
}

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

:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
    border-radius: var(--radius-s);
}

code,
pre {
    font-family: var(--font-mono);
    font-size: 0.9em;
}

code {
    padding: 0.05em 0.3em;
    background: var(--color-panel);
    border-radius: var(--radius-s);
}

.skip-link {
    position: absolute;
    left: var(--space-3);
    top: -100px;
    z-index: 10;
    padding: var(--space-2) var(--space-3);
    background: var(--color-accent);
    color: var(--color-on-accent);
    border-radius: var(--radius-s);
}

.skip-link:focus {
    top: var(--space-2);
}

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

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
    }
}

/* --- Il foglio ------------------------------------------------------------- */

/* Cornice doppia come nelle tavole: linea spessa del foglio e, staccata, una linea sottile esterna. */
.sheet {
    max-width: var(--sheet-width);
    margin: var(--space-6) auto;
    background: var(--color-surface);
    border: 1.5px solid var(--color-frame);
    box-shadow:
        0 0 0 6px var(--color-page),
        0 0 0 7px var(--color-rule-strong);
}

.sheet-header {
    display: flex;
    align-items: center;
    gap: var(--space-5);
    padding: var(--space-4) var(--sheet-pad);
    border-bottom: 1px solid var(--color-rule);
}

.monogram {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.875rem;
    line-height: 1;
    letter-spacing: 0.01em;
    color: var(--color-ink);
    text-decoration: none;
}

.monogram:hover {
    color: var(--color-ink);
}

.nav {
    display: flex;
    gap: var(--space-1);
    margin-left: auto;
}

.nav a {
    padding: var(--space-2) var(--space-3);
    color: var(--color-ink-muted);
    font-weight: 500;
    text-decoration: none;
    border-radius: var(--radius-s);
}

.nav a:hover {
    color: var(--color-ink);
    background: var(--color-panel);
}

.nav a.is-current {
    color: var(--color-ink);
    border-radius: var(--radius-s) var(--radius-s) 0 0;
    box-shadow: inset 0 -2px 0 var(--color-accent);
}

.header-end {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

main {
    display: block;
    padding: var(--space-7) var(--sheet-pad);
    outline: none;
}

/* --- Pulsanti -------------------------------------------------------------- */

.button {
    display: inline-flex;
    align-items: center;
    padding: 0.6rem 1.15rem;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 1.0625rem;
    color: var(--color-on-accent);
    background: var(--color-accent);
    border-radius: var(--radius-s);
    text-decoration: none;
}

.button:hover {
    color: var(--color-on-accent);
    background: var(--color-accent-hover);
}

.button-small {
    padding: 0.35rem 0.8rem;
    font-size: 1rem;
}

/* --- Selettore di lingua (come in ModbusKit) ------------------------------- */

.lang-switch ul {
    list-style: none;
    margin: 0;
    padding: 2px;
    display: flex;
    gap: 2px;
    border: 1px solid var(--color-rule);
    border-radius: var(--radius-m);
    background: var(--color-page);
}

.lang-switch a {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.3rem 0.55rem;
    color: var(--color-ink-muted);
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 0.9375rem;
    text-decoration: none;
    border-radius: var(--radius-s);
}

.lang-switch a:hover {
    color: var(--color-ink);
    background: var(--color-panel);
}

.lang-switch a.is-current {
    color: var(--color-ink);
    background: var(--color-surface);
    box-shadow: 0 0 0 1px var(--color-rule-strong);
}

.lang-switch img {
    display: block;
    width: 21px;
    height: 14px;
    object-fit: cover;
    border-radius: 2px;
    box-shadow: 0 0 0 1px var(--color-rule);
}

.lang-switch a:not(.is-current) img {
    opacity: 0.55;
    filter: saturate(0.6);
}

/* --- Apertura della home --------------------------------------------------- */

.hero {
    padding-bottom: var(--space-6);
}

/* Titolo e quota hanno la stessa larghezza: la quota misura il titolo, come in un disegno. */
.measured {
    display: inline-grid;
    max-width: 100%;
}

.hero h1 {
    margin: 0;
    max-width: 20ch;
    font-size: clamp(2.375rem, 1.3rem + 4vw, 4.5rem);
    line-height: 1.02;
    letter-spacing: -0.005em;
}

.quota {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-top: var(--space-4);
    color: var(--color-dimension);
}

.quota::before,
.quota::after {
    content: "";
    flex: 1;
    height: 0.75rem;
    background: linear-gradient(currentColor, currentColor) center / 100% 1.5px no-repeat;
}

.quota::before {
    border-left: 1.5px solid currentColor;
}

.quota::after {
    border-right: 1.5px solid currentColor;
}

.quota span {
    font-family: var(--font-mono);
    font-size: 0.9375rem;
    color: var(--color-accent);
    white-space: nowrap;
}

.lead {
    max-width: 56ch;
    margin: var(--space-5) 0 0;
    font-size: 1.25rem;
    line-height: 1.55;
    color: var(--color-ink-muted);
}

/* --- Sezioni --------------------------------------------------------------- */

.block {
    margin-top: var(--space-6);
    padding-top: var(--space-6);
    border-top: 1px solid var(--color-rule);
}

.feature {
    display: grid;
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
    gap: var(--space-6);
    align-items: start;
}

.feature-text > p {
    max-width: 52ch;
}

.tool-links {
    list-style: none;
    margin: var(--space-5) 0;
    padding: 0;
    border-top: 1px solid var(--color-rule);
}

.tool-links li {
    display: grid;
    gap: 0.1rem;
    padding: var(--space-3) 0;
    border-bottom: 1px solid var(--color-rule);
}

.tool-links a {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 1.1875rem;
    text-decoration: none;
}

.tool-links a:hover {
    text-decoration: underline;
}

.tool-links span {
    font-size: 0.9375rem;
    color: var(--color-ink-muted);
}

/* Il riquadro della home: due registri, una quota, un float. Lo stesso linguaggio di ModbusKit. */
.decode-figure {
    margin: 0;
    padding: var(--space-5);
    background: var(--color-page);
    border: 1px solid var(--color-rule);
    border-radius: var(--radius-m);
}

.decode-registers {
    display: block;
    font-family: var(--font-mono);
    font-weight: 500;
    font-size: clamp(2rem, 1.4rem + 2.2vw, 3rem);
    line-height: 1;
    color: var(--color-ink);
    word-spacing: -0.2em;
}

.decode-dimension {
    display: block;
    height: 0.625rem;
    margin: var(--space-2) 0;
    border: 1.5px solid var(--color-dimension);
    border-top: none;
}

.decode-label {
    display: block;
    font-size: 0.9375rem;
    color: var(--color-ink-muted);
}

.decode-result {
    display: block;
    margin-top: var(--space-4);
    font-family: var(--font-mono);
    font-weight: 500;
    font-size: clamp(1.75rem, 1.3rem + 1.6vw, 2.5rem);
    line-height: 1;
    color: var(--color-accent);
}

.decode-figure figcaption {
    margin-top: var(--space-5);
    padding-top: var(--space-3);
    border-top: 1px solid var(--color-rule);
    font-size: 0.9375rem;
    color: var(--color-ink-muted);
}

.actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-3) var(--space-5);
}

/* --- Intestazione delle pagine interne ------------------------------------- */

.page-head {
    max-width: 62ch;
    margin-bottom: var(--space-6);
}

.page-head h1 {
    margin: 0 0 var(--space-3);
    font-size: clamp(2.125rem, 1.5rem + 2.4vw, 3.25rem);
    line-height: 1.05;
}

.page-head .lead {
    margin-top: var(--space-3);
}

.page-date {
    margin: 0;
    font-size: 0.9375rem;
    color: var(--color-ink-muted);
}

/* --- Elenco delle note ------------------------------------------------------ */

.note-list {
    list-style: none;
    margin: 0 0 var(--space-5);
    padding: 0;
}

.note-list li {
    max-width: 68ch;
    padding: var(--space-4) 0;
    border-bottom: 1px solid var(--color-rule);
}

.note-list li:first-child {
    padding-top: 0;
}

.note-title {
    margin: 0 0 var(--space-1);
    font-size: 1.5rem;
}

.note-title a {
    color: var(--color-ink);
    text-decoration: none;
}

.note-title a:hover {
    color: var(--color-accent);
    text-decoration: underline;
}

.note-summary {
    margin: 0 0 var(--space-1);
    color: var(--color-ink-muted);
}

.note-date {
    margin: 0;
    font-size: 0.875rem;
    color: var(--color-ink-muted);
}

/* --- Progetti --------------------------------------------------------------- */

.project {
    max-width: 72ch;
    padding: var(--space-6) 0;
    border-top: 1px solid var(--color-rule);
}

.project:last-child {
    padding-bottom: 0;
}

.project-head {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: var(--space-2) var(--space-4);
    margin-bottom: var(--space-3);
}

.project-head h2 {
    margin: 0;
}

.status {
    margin: 0;
    padding: 0.05rem 0.55rem;
    font-size: 0.875rem;
    color: var(--color-ink-muted);
    border: 1px dashed var(--color-rule-strong);
    border-radius: var(--radius-s);
}

.status-live {
    color: var(--color-accent);
    border: 1px solid var(--color-accent);
}

.specs {
    margin: var(--space-5) 0;
    display: grid;
    gap: var(--space-2);
}

.specs div {
    display: grid;
    grid-template-columns: 10rem minmax(0, 1fr);
    gap: var(--space-4);
}

.specs dt {
    color: var(--color-ink-muted);
}

.specs dd {
    margin: 0;
}

/* --- Testo lungo ------------------------------------------------------------ */

.prose {
    max-width: 68ch;
}

.prose h2 {
    margin: var(--space-6) 0 var(--space-3);
    font-size: 1.5rem;
}

.prose h2:first-child {
    margin-top: 0;
}

.prose ul {
    margin: 0 0 var(--space-4);
    padding-left: 1.25rem;
}

.prose li {
    margin-bottom: var(--space-1);
}

.prose pre {
    margin: 0 0 var(--space-4);
    padding: var(--space-4) var(--space-5);
    overflow-x: auto;
    background: var(--color-page);
    border: 1px solid var(--color-rule);
    border-radius: var(--radius-m);
    line-height: 1.55;
}

.prose pre code {
    padding: 0;
    background: none;
}

.table-wrap {
    margin: 0 0 var(--space-4);
    overflow-x: auto;
    border: 1px solid var(--color-rule);
    border-radius: var(--radius-s);
}

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

.prose th,
.prose td {
    padding: var(--space-2) var(--space-3);
    text-align: left;
    border-bottom: 1px solid var(--color-rule);
    white-space: nowrap;
}

.prose thead th {
    font-family: var(--font-display);
    font-weight: 600;
    color: var(--color-ink-muted);
    background: var(--color-panel);
}

.prose tbody tr:last-child td {
    border-bottom: none;
}

.prose td.mono {
    font-family: var(--font-mono);
}

.prose td.num {
    text-align: right;
    font-family: var(--font-mono);
}

.prose tr.is-right td {
    background: var(--color-match-surface);
}

/* --- Piè di pagina e cartiglio ----------------------------------------------- */

.sheet-footer {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: var(--space-5);
    padding: var(--space-5) var(--sheet-pad) var(--sheet-pad);
    border-top: 1px solid var(--color-rule);
}

.footer-note {
    margin: 0;
    font-size: 0.9375rem;
    color: var(--color-ink-muted);
}

/* Il cartiglio: il riquadro che chiude ogni tavola tecnica, qui come firma del sito. */
.cartiglio {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    width: min(100%, 31rem);
    border: 1.5px solid var(--color-frame);
    background: var(--color-surface);
}

.c-mark {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-3) var(--space-5);
    border-right: 1.5px solid var(--color-frame);
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 2.5rem;
    line-height: 1;
}

/* Le celle sono separate da una griglia di 1px: lo sfondo del contenitore fa da linea. */
.c-data {
    margin: 0;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1px;
    background: var(--color-rule-strong);
}

.c-data > div {
    padding: 0.3rem 0.6rem 0.35rem;
    background: var(--color-surface);
}

.c-data .c-title {
    grid-column: 1 / -1;
}

.c-data dt {
    font-size: 0.75rem;
    line-height: 1.3;
    color: var(--color-ink-muted);
}

.c-data dd {
    margin: 0;
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    font-weight: 500;
    line-height: 1.4;
}

.c-data .c-title dd {
    font-family: var(--font-display);
    font-size: 1.0625rem;
    font-weight: 600;
}

/* --- Schermi stretti --------------------------------------------------------- */

@media (max-width: 80rem) {
    .sheet {
        margin: var(--space-6) var(--space-5);
    }
}

@media (max-width: 52rem) {
    :root {
        --sheet-pad: 1.25rem;
    }

    .sheet {
        margin: var(--space-3) 0.625rem;
        box-shadow:
            0 0 0 4px var(--color-page),
            0 0 0 5px var(--color-rule-strong);
    }

    /* Prima riga: monogramma, ModbusKit e lingua. Seconda riga: menu. */
    .sheet-header {
        flex-wrap: wrap;
        row-gap: var(--space-2);
        padding-block: var(--space-3) var(--space-1);
    }

    .header-end {
        margin-left: auto;
        gap: var(--space-3);
    }

    .nav {
        order: 3;
        width: 100%;
        margin-left: calc(-1 * var(--space-3));
    }

    main {
        padding-block: var(--space-6);
    }

    .feature {
        grid-template-columns: minmax(0, 1fr);
    }

    .specs div {
        grid-template-columns: minmax(0, 1fr);
        gap: 0;
    }

    .sheet-footer {
        flex-direction: column-reverse;
        align-items: stretch;
    }

    .cartiglio {
        width: 100%;
    }
}

@media (max-width: 26rem) {
    .header-end .button-small {
        padding-inline: 0.6rem;
    }

    .c-mark {
        padding-inline: var(--space-3);
        font-size: 2rem;
    }
}

/* --- Lista email del simulatore -------------------------------------------- */

.signup {
    margin-top: var(--space-5);
    padding: var(--space-5);
    border: 1px dashed var(--color-frame);
    background: var(--color-surface);
}

.signup h3 {
    margin: 0 0 var(--space-3);
    font-family: var(--font-display);
    font-size: 1.25rem;
}

.signup-form label {
    display: block;
    margin-bottom: var(--space-2);
    font-size: 0.9375rem;
    font-weight: 600;
}

.signup-row {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
}

.signup-row input {
    flex: 1 1 16rem;
    min-width: 0;
    padding: 0.55rem 0.75rem;
    font: inherit;
    color: var(--color-ink);
    background: var(--color-surface);
    border: 1px solid var(--color-frame);
    border-radius: var(--radius-s);
}

.signup-row input:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 1px;
}

.signup-row button {
    border: 0;
    cursor: pointer;
}

.signup .actions {
    margin: 0;
}

.signup-note {
    margin: var(--space-3) 0 0;
    font-size: 0.9375rem;
    color: var(--color-ink-muted);
}

/* --- Piè di pagina: sostegno e privacy ------------------------------------- */

.footer-notes {
    display: grid;
    gap: var(--space-2);
    max-width: 30rem;
}

.footer-support {
    margin: 0;
    font-size: 0.9375rem;
    color: var(--color-ink-muted);
}

.footer-note {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2) var(--space-4);
}