/* MCP Wave — art direction: "signal".
   Instrument-panel restraint: ink on paper, hairline rules, monospace for
   structural/technical labels, a waveform spine. Left-aligned editorial layout,
   no cards, no gradients. */

:root {
    --ink: #10161d;
    --ink-soft: #46525f;
    --paper: #f7f7f4;
    --rule: #d8d8d1;
    --signal: #0b6b6b;
    --warn: #8a3a12;
    --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
    --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
    :root {
        --ink: #e8e8e3;
        --ink-soft: #9aa4ad;
        --paper: #0c1116;
        --rule: #263038;
        --signal: #35b1ab;
        --warn: #d98a5a;
    }
}

* { box-sizing: border-box; }

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

body {
    margin: 0;
    background: var(--paper);
    color: var(--ink);
    font-family: var(--sans);
    font-size: 17px;
    line-height: 1.65;
}

.wrap {
    max-width: 46rem;
    margin: 0 auto;
    padding: 0 1.5rem 6rem;
}

/* Masthead ---------------------------------------------------------------- */
header.mast {
    border-bottom: 1px solid var(--rule);
    margin-bottom: 3rem;
}

.mast-inner {
    max-width: 46rem;
    margin: 0 auto;
    padding: 1.4rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
}

.brand {
    display: flex;
    align-items: center;
    gap: .6rem;
    font-family: var(--mono);
    font-size: .95rem;
    letter-spacing: .06em;
    text-transform: uppercase;
    color: var(--ink);
    text-decoration: none;
    font-weight: 600;
}

.brand svg { display: block; }

nav.mast-nav a {
    font-family: var(--mono);
    font-size: .8rem;
    letter-spacing: .04em;
    color: var(--ink-soft);
    text-decoration: none;
    margin-left: 1.2rem;
}

nav.mast-nav a:hover { color: var(--signal); }

/* Type -------------------------------------------------------------------- */
h1 {
    font-size: clamp(2rem, 5vw, 2.9rem);
    line-height: 1.12;
    letter-spacing: -0.02em;
    margin: 0 0 1rem;
    font-weight: 650;
}

h2 {
    font-size: 1.15rem;
    letter-spacing: -0.01em;
    margin: 2.6rem 0 .7rem;
    font-weight: 650;
}

h3 {
    font-size: 1rem;
    margin: 1.6rem 0 .4rem;
    font-weight: 650;
}

.lede {
    font-size: 1.15rem;
    color: var(--ink-soft);
    margin: 0 0 2rem;
    max-width: 38rem;
}

p, li { color: var(--ink); }
p { margin: 0 0 1rem; }
ul, ol { padding-left: 1.2rem; margin: 0 0 1rem; }
li { margin-bottom: .4rem; }

a { color: var(--signal); text-underline-offset: 2px; }

code {
    font-family: var(--mono);
    font-size: .88em;
    background: color-mix(in srgb, var(--ink) 7%, transparent);
    padding: .1em .35em;
    border-radius: 2px;
}

/* Structural labels ------------------------------------------------------- */
.label {
    font-family: var(--mono);
    font-size: .72rem;
    letter-spacing: .12em;
    text-transform: uppercase;
    color: var(--ink-soft);
    display: block;
    margin-bottom: .5rem;
}

.meta {
    font-family: var(--mono);
    font-size: .78rem;
    color: var(--ink-soft);
}

hr {
    border: 0;
    border-top: 1px solid var(--rule);
    margin: 2.5rem 0;
}

/* Definition rows (scopes, data table) ------------------------------------ */
.rows { border-top: 1px solid var(--rule); margin: 1rem 0 1.5rem; }

.row {
    display: grid;
    grid-template-columns: 15rem 1fr;
    gap: 1rem;
    padding: .85rem 0;
    border-bottom: 1px solid var(--rule);
    align-items: start;
}

.row > :first-child {
    font-family: var(--mono);
    font-size: .82rem;
    color: var(--ink);
    word-break: break-word;
}

.row > :last-child { color: var(--ink-soft); font-size: .95rem; }

@media (max-width: 40rem) {
    .row { grid-template-columns: 1fr; gap: .25rem; }
}

/* Callout ----------------------------------------------------------------- */
.callout {
    border-left: 2px solid var(--signal);
    padding: .2rem 0 .2rem 1rem;
    margin: 1.5rem 0;
    color: var(--ink);
}

.callout.warn { border-left-color: var(--warn); }

/* Waveform spine ---------------------------------------------------------- */
.wave {
    width: 100%;
    height: 46px;
    display: block;
    margin: 2rem 0 2.5rem;
    color: var(--signal);
    opacity: .85;
}

footer {
    border-top: 1px solid var(--rule);
    margin-top: 4rem;
    padding-top: 1.5rem;
    font-family: var(--mono);
    font-size: .78rem;
    color: var(--ink-soft);
    display: flex;
    gap: 1.2rem;
    flex-wrap: wrap;
}

footer a { color: var(--ink-soft); text-decoration: none; }
footer a:hover { color: var(--signal); }