/* Лендинг C4-Builder: без JS и внешних ресурсов, шрифты системные.
   Палитра — канонические цвета C4-PlantUML (person/system/external), первый экран —
   сама C4-диаграмма: человек → система → выходы сборки. */

:root {
    color-scheme: light dark;

    --paper: #f4f7fa;
    --ink: #12263a;
    --muted: #4b5e71;
    --rule: #cdd8e3;
    --arrow: #5d7084;
    --link: #0b5cad;
    --focus: #e8a317;

    --person: #08427b;
    --system: #1168bd;
    --external: #5c6977;
    --on-box: #ffffff;

    --code-bg: #e6edf4;
    --term-bg: #0c1a29;
    --term-ink: #d7e3ef;
    --term-muted: #7f93a8;
    --ok: #4cc26a;
    --err: #ff8078;

    --display: Bahnschrift, "DIN Alternate", "DIN Condensed", "Nimbus Sans Narrow", "Arial Narrow",
        sans-serif-condensed, sans-serif;
    --text: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --mono: ui-monospace, "SF Mono", "Cascadia Code", "JetBrains Mono", Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
    :root {
        --paper: #0b1622;
        --ink: #e2eaf2;
        --muted: #9aaec2;
        --rule: #223649;
        --arrow: #7f93a8;
        --link: #82bdf5;

        --person: #1b5596;
        --system: #1667b8;
        --external: #46535f;

        --code-bg: #142739;
        --term-bg: #050d16;
    }
}

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

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

body {
    margin: 0;
    background: var(--paper);
    color: var(--ink);
    font: 1.0625rem/1.6 var(--text);
}

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

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

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

:not(pre) > code {
    background: var(--code-bg);
    padding: 0.1em 0.35em;
    border-radius: 3px;
    overflow-wrap: anywhere;
}

pre {
    margin: 0;
    padding: 1rem 1.25rem;
    overflow-x: auto;
    background: var(--code-bg);
    border-radius: 6px;
    line-height: 1.55;
}

.wrap {
    max-width: 62rem;
    margin: 0 auto;
    padding-inline: 1rem;
}

/* шапка */

.top {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    justify-content: space-between;
    gap: 0.5rem 1.5rem;
    padding-top: 1.25rem;
    padding-bottom: 1.25rem;
}

.mark {
    font: 700 1.35rem/1 var(--display);
    color: var(--ink);
    text-decoration: none;
    letter-spacing: 0.01em;
}

.top nav {
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem 1.25rem;
}

/* первый экран: C4-диаграмма из HTML */

.diagram {
    padding-top: 1.5rem;
    padding-bottom: 3rem;
}

.box {
    display: block;
    color: var(--on-box);
    padding: 1.1rem 1.4rem 1.25rem;
    border-radius: 4px;
}

.box p {
    margin: 0.5rem 0 0;
}

.kind {
    display: block;
    font-size: 0.85rem;
    font-style: italic;
    opacity: 0.85;
}

.name {
    display: block;
    font: 700 1.25rem/1.2 var(--display);
}

.person {
    max-width: 24rem;
    background: var(--person);
    border-radius: 22px;
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 0 1rem;
    align-items: start;
}

.person svg {
    width: 2.4rem;
    height: 2.4rem;
    margin-top: 0.2rem;
    fill: currentColor;
}

.system {
    background: var(--system);
    padding: 1.6rem clamp(1.25rem, 4vw, 2.5rem) 2rem;
}

.system h1 {
    margin: 0.6rem 0 0;
    max-width: 18ch;
    font: 700 clamp(2.1rem, 6.2vw, 3.9rem) / 1.04 var(--display);
    letter-spacing: -0.005em;
}

.system .lead {
    max-width: 38rem;
    margin-top: 1.1rem;
    font-size: 1.1rem;
}

.system pre {
    margin-top: 1.5rem;
    max-width: 30rem;
    background: rgb(0 0 0 / 0.22);
    color: var(--on-box);
}

/* связь C4: вертикальная линия со стрелкой и подписью */

.rel {
    position: relative;
    margin-left: 2.6rem;
    padding: 1.1rem 0 1.4rem 1.1rem;
    border-left: 2px solid var(--arrow);
    color: var(--muted);
    font-size: 0.95rem;
    line-height: 1.4;
}

.rel::after {
    content: "";
    position: absolute;
    left: -8px;
    bottom: -2px;
    border-style: solid;
    border-width: 11px 7px 0;
    border-color: var(--arrow) transparent transparent;
}

.box p code {
    background: rgb(255 255 255 / 0.18);
    color: inherit;
}

.rel b {
    color: var(--ink);
}

.rel code {
    display: block;
    background: none;
    padding: 0;
    font-size: 0.85rem;
    font-style: italic;
}

.outputs {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
    gap: 1rem;
}

a.box {
    background: var(--external);
    text-decoration: none;
}

a.box:hover .name {
    text-decoration: underline;
    text-underline-offset: 0.15em;
}

/* разделы */

section {
    padding-top: 2.5rem;
    padding-bottom: 2.5rem;
    border-top: 1px solid var(--rule);
}

h2 {
    margin: 0 0 1.25rem;
    font: 700 clamp(1.6rem, 3.6vw, 2.2rem) / 1.15 var(--display);
}

.split {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 24rem), 1fr));
    gap: 1.5rem 2.5rem;
    align-items: start;
}

.steps {
    margin: 0;
    padding-left: 1.4rem;
}

.steps li + li {
    margin-top: 0.9rem;
}

.steps li::marker {
    font: 700 1.1rem var(--display);
    color: var(--system);
}

.term {
    background: var(--term-bg);
    color: var(--term-ink);
}

.term .p {
    color: var(--term-muted);
    user-select: none;
}

.term .ok {
    color: var(--ok);
}

.term .err {
    color: var(--err);
}

.note {
    color: var(--muted);
    font-size: 0.95rem;
    margin: 0.75rem 0 0;
}

section h3 {
    margin: 0 0 0.6rem;
    font: 700 1.15rem/1.2 var(--display);
}

.diff {
    margin: 0;
    max-width: 48rem;
}

.diff dt {
    font: 700 1.15rem/1.3 var(--display);
}

.diff dd {
    margin: 0.2rem 0 1.1rem;
}

.diff dd:last-child {
    margin-bottom: 0;
}

.intro {
    max-width: 44rem;
    margin: 0 0 1.5rem;
}

.links {
    margin: 0;
    padding: 0;
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 16rem), 1fr));
    gap: 0.75rem 2rem;
}

.links a {
    font-weight: 600;
}

.links span {
    display: block;
    color: var(--muted);
    font-size: 0.95rem;
}

footer {
    border-top: 1px solid var(--rule);
    padding-top: 1.5rem;
    padding-bottom: 2.5rem;
    color: var(--muted);
    font-size: 0.95rem;
}

footer p {
    margin: 0 0 0.4rem;
    max-width: 48rem;
}