/* h5docs — shared style.
   White ground, one accent per language lane, generous measure for prose. */

:root {
    --ground:      #ffffff;
    --surface:     #f7f8f9;
    --surface-alt: #eef1f3;
    --ink:         #16202a;
    --ink-soft:    #4f5b66;
    --ink-faint:   #7d8892;
    --line:        #dde3e7;
    --line-soft:   #e9edf0;

    /* One hue per language, used only where the language is the subject. */
    --fortran:  #7a3e9d;
    --c:        #0d6068;
    --cpp:      #3a4b9e;
    --python:   #96601b;

    --accent:   #0d6068;
    --code-bg:  #f4f6f7;

    --f-sans: "Helvetica Neue", "Hiragino Kaku Gothic ProN", "Noto Sans JP", system-ui, sans-serif;
    --f-mono: "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;

    --measure: 42rem;
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --ground:      #0f1418;
        --surface:     #161d23;
        --surface-alt: #1d262d;
        --ink:         #e3e9ed;
        --ink-soft:    #a5b1ba;
        --ink-faint:   #78848d;
        --line:        #2a343c;
        --line-soft:   #212a31;
        --fortran:     #c79ae0;
        --c:           #5fc0c6;
        --cpp:         #97a6ee;
        --python:      #d9a961;
        --accent:      #5fc0c6;
        --code-bg:     #1a2228;
    }
}

* { box-sizing: border-box; }

body {
    margin: 0;
    background: var(--ground);
    color: var(--ink);
    font-family: var(--f-sans);
    font-size: 16px;
    line-height: 1.8;
    -webkit-font-smoothing: antialiased;
}

/* ---------- shell ---------- */

.masthead {
    border-bottom: 1px solid var(--line);
    background: var(--ground);
    position: sticky;
    top: 0;
    z-index: 10;
}

.masthead-inner {
    max-width: 64rem;
    margin: 0 auto;
    padding: 0.85rem 1.5rem;
    display: flex;
    align-items: baseline;
    gap: 1.75rem;
    flex-wrap: wrap;
}

.wordmark {
    font-family: var(--f-mono);
    font-weight: 600;
    font-size: 0.95rem;
    letter-spacing: -0.01em;
    color: var(--ink);
    text-decoration: none;
}

.masthead nav {
    display: flex;
    gap: 1.25rem;
    font-size: 0.86rem;
}

.masthead nav a { color: var(--ink-soft); text-decoration: none; }
.masthead nav a:hover,
.masthead nav a[aria-current="page"] { color: var(--accent); }

.page {
    max-width: 64rem;
    margin: 0 auto;
    padding: 3rem 1.5rem 6rem;
}

footer {
    max-width: 64rem;
    margin: 0 auto;
    padding: 2rem 1.5rem 4rem;
    border-top: 1px solid var(--line);
    color: var(--ink-faint);
    font-size: 0.84rem;
}

/* ---------- type ---------- */

h1 {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    line-height: 1.2;
    letter-spacing: -0.02em;
    margin: 0 0 0.75rem;
    text-wrap: balance;
}

h2 {
    font-size: 1.3rem;
    margin: 3rem 0 1rem;
    padding-bottom: 0.4rem;
    border-bottom: 1px solid var(--line);
    text-wrap: balance;
}

h3 { font-size: 1.02rem; margin: 2rem 0 0.6rem; }

p, ul, ol { max-width: var(--measure); }
p { margin: 0 0 1rem; }
ul, ol { margin: 0 0 1rem; padding-left: 1.3rem; }
li { margin-bottom: 0.3rem; }

.lede {
    font-size: 1.08rem;
    color: var(--ink-soft);
    max-width: var(--measure);
    margin-bottom: 2rem;
}

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

code {
    font-family: var(--f-mono);
    font-size: 0.87em;
    background: var(--code-bg);
    padding: 0.12em 0.35em;
    border-radius: 2px;
}

pre {
    margin: 0;
    padding: 1rem 1.15rem;
    overflow-x: auto;
    background: var(--surface);
    border: 1px solid var(--line);
    font-family: var(--f-mono);
    font-size: 0.83rem;
    line-height: 1.7;
}

pre code { background: none; padding: 0; font-size: inherit; }

/* ---------- language tabs ---------- */

.langs { margin: 1.25rem 0 2rem; }

.langs-bar {
    display: flex;
    gap: 0.35rem;
    border-bottom: 1px solid var(--line);
}

.langs-bar button {
    appearance: none;
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    margin-bottom: -1px;
    padding: 0.45rem 0.9rem;
    font: inherit;
    font-size: 0.88rem;
    color: var(--ink-faint);
    cursor: pointer;
}

.langs-bar button:hover { color: var(--ink); }
.langs-bar button[aria-selected="true"] { color: var(--ink); border-bottom-color: currentColor; }
.langs-bar button[data-lang="fortran"][aria-selected="true"] { color: var(--fortran); }
.langs-bar button[data-lang="c"][aria-selected="true"]       { color: var(--c); }
.langs-bar button[data-lang="cpp"][aria-selected="true"]     { color: var(--cpp); }
.langs-bar button[data-lang="python"][aria-selected="true"]  { color: var(--python); }

.langs-panel { padding-top: 1rem; }
.langs-panel[hidden] { display: none; }
.langs-panel > p:first-child { margin-top: 0; }

/* Full program behind a disclosure, so the page shows the essential lines. */
details.full {
    margin-top: 0.75rem;
    border: 1px solid var(--line);
    background: var(--surface);
}

details.full > summary {
    padding: 0.5rem 0.9rem;
    cursor: pointer;
    font-size: 0.85rem;
    color: var(--ink-soft);
    list-style-position: inside;
}

details.full > summary:hover { color: var(--ink); }
details.full[open] > summary { border-bottom: 1px solid var(--line); }
details.full pre { border: none; background: none; }

/* ---------- tables ---------- */

.tablewrap { overflow-x: auto; border: 1px solid var(--line); margin: 1rem 0 1.5rem; }
table { border-collapse: collapse; width: 100%; font-size: 0.9rem; }
th, td { padding: 0.55rem 0.85rem; text-align: left; border-bottom: 1px solid var(--line-soft); vertical-align: top; }
th {
    font-size: 0.74rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--ink-faint);
    background: var(--surface-alt);
    white-space: nowrap;
}
tbody tr:last-child td { border-bottom: none; }

/* ---------- routing cards on the index ---------- */

.routes { display: grid; gap: 1rem; grid-template-columns: 1fr; margin: 1.5rem 0 2.5rem; }
@media (min-width: 44rem) { .routes { grid-template-columns: repeat(2, 1fr); } }

.route {
    border: 1px solid var(--line);
    border-left: 3px solid var(--line);
    padding: 1rem 1.15rem;
    text-decoration: none;
    color: inherit;
    display: block;
}
.route:hover { background: var(--surface); }
.route[data-lang="fortran"] { border-left-color: var(--fortran); }
.route[data-lang="c"]       { border-left-color: var(--c); }
.route[data-lang="cpp"]     { border-left-color: var(--cpp); }
.route[data-lang="python"]  { border-left-color: var(--python); }

.route-lang {
    font-family: var(--f-mono);
    font-size: 0.75rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--ink-faint);
}
.route-name { font-family: var(--f-mono); font-weight: 600; font-size: 1rem; margin: 0.15rem 0 0.35rem; }
.route p { margin: 0; font-size: 0.9rem; color: var(--ink-soft); }

/* ---------- callout ---------- */

.note {
    border-left: 2px solid var(--accent);
    padding: 0.15rem 0 0.15rem 1rem;
    margin: 1.25rem 0;
    max-width: var(--measure);
    color: var(--ink-soft);
    font-size: 0.94rem;
}

.note strong { color: var(--ink); }

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

/* ---------- reference pages, generated from Markdown ---------- */

.reference h2:first-of-type { margin-top: 1.5rem; }
.reference pre { font-size: 0.8rem; }
.reference table { font-size: 0.86rem; }