/* ============================================================
   The Human Layer — site styles.
   Built on tokens.css (imported separately, never re-derived here).
   ============================================================ */

@font-face {
    font-family: "Schibsted Grotesk";
    src: url("../fonts/SchibstedGrotesk.ttf") format("truetype");
    font-weight: 400 700;
    font-display: swap;
}

@font-face {
    font-family: "Spline Sans Mono";
    src: url("../fonts/SplineSansMono.ttf") format("truetype");
    font-weight: 400 600;
    font-display: swap;
}

* { box-sizing: border-box; }

html { color-scheme: light dark; }

body {
    margin: 0;
    background: var(--paper);
    color: var(--ink);
    font-family: var(--font-display);
    font-size: 17px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
a:focus-visible, button:focus-visible {
    outline: 2px solid var(--sheen);
    outline-offset: 2px;
}

.kicker {
    font-family: var(--font-mono);
    font-size: 13px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--sheen);
    margin: 0 0 8px;
}

/* ---- Header ---- */
.site-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    border-bottom: 1px solid var(--hairline);
    background: var(--header-bg);
    position: sticky;
    top: 0;
    backdrop-filter: blur(6px);
    z-index: 10;
}

.wordmark {
    font-family: var(--font-mono);
    font-size: 13px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--ink);
}
.wordmark:hover { color: var(--sheen); }

.corvid-theme-toggle {
    display: inline-flex; align-items: center; justify-content: center;
    width: 34px; height: 34px; padding: 0;
    background: none; border: 1px solid var(--ink-12); color: var(--ink-70);
    cursor: pointer; transition: border-color 0.2s, color 0.2s;
}
.corvid-theme-toggle:hover { border-color: var(--sheen); color: var(--sheen); }
.corvid-theme-toggle svg { width: 17px; height: 17px; }
.corvid-theme-toggle .moon { display: none; }
:root[data-theme="dark"] .corvid-theme-toggle .sun { display: none; }
:root[data-theme="dark"] .corvid-theme-toggle .moon { display: inline; }
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) .corvid-theme-toggle .sun { display: none; }
    :root:not([data-theme="light"]) .corvid-theme-toggle .moon { display: inline; }
}
:root[data-theme="light"] .corvid-theme-toggle .sun { display: inline; }
:root[data-theme="light"] .corvid-theme-toggle .moon { display: none; }

/* ---- Page shell ---- */
.page {
    max-width: 760px;
    margin: 0 auto;
    padding: 64px 24px 96px;
}

/* ---- Hero (landing page) ---- */
.hero { margin-bottom: 56px; }
.hero .kicker { font-size: 13px; }
.hero h1 {
    font-size: clamp(38px, 6vw, 56px);
    line-height: 1.08;
    margin: 0 0 12px;
    letter-spacing: -0.01em;
}
.hero .subtitle {
    font-size: clamp(18px, 2.4vw, 22px);
    color: var(--text-faint);
    margin: 0 0 28px;
    max-width: 46ch;
}

.cta {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 13px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--paper);
    background: var(--sheen);
    padding: 12px 22px;
    border-radius: 5px;
    border: 0;
}
.cta:hover { background: var(--sheen-hover); color: var(--paper); }

.status-note {
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--text-faint);
    margin-top: 20px;
    letter-spacing: 0.02em;
}

/* ---- Table of contents ---- */
.toc {
    margin-top: 56px;
    border-top: 1px solid var(--hairline);
}
.toc-item {
    display: grid;
    grid-template-columns: minmax(13ch, max-content) 1fr max-content;
    align-items: baseline;
    gap: 18px;
    padding: 20px 0;
    border-bottom: 1px solid var(--hairline);
}
.toc-item .num {
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--text-faint);
    white-space: nowrap;
}
.toc-item .title {
    font-size: 18px;
}
a.toc-item .title { color: var(--ink); }
a.toc-item:hover .title { color: var(--sheen); }
a.toc-item:hover .num { color: var(--sheen); }

.toc-item.upcoming { color: var(--text-faint); }
.toc-item.upcoming .title { color: var(--text-faint); }
.toc-item.upcoming .tag {
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    border: 1px solid var(--ink-12);
    border-radius: 999px;
    padding: 3px 10px;
}

/* ---- Chapter page ---- */
.breadcrumb {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-mono);
    font-size: 14px;
    letter-spacing: 0.04em;
    color: var(--text-muted);
    margin-bottom: 40px;
}
.breadcrumb-arrow {
    width: 18px;
    height: 18px;
    flex: none;
}
.breadcrumb:hover { color: var(--sheen); }

.chapter h1 {
    font-size: clamp(30px, 4.5vw, 42px);
    line-height: 1.15;
    margin: 0 0 40px;
    letter-spacing: -0.01em;
}

.chapter-body {
    max-width: var(--measure);
    font-size: 18px;
    line-height: 1.75;
}
.chapter-body p { margin: 0 0 1.4em; }
.chapter-body em { color: var(--text-muted); }
.chapter-body hr {
    border: none;
    border-top: 1px solid var(--hairline);
    margin: 2.5em 0;
}
.chapter-body h2, .chapter-body h3 {
    font-size: 1.3em;
    margin: 1.6em 0 0.8em;
}

.chapter-nav {
    display: flex;
    justify-content: space-between;
    gap: 24px;
    margin-top: 64px;
    padding-top: 24px;
    border-top: 1px solid var(--hairline);
}
.chapter-nav a { max-width: 46%; }
.chapter-nav .next { text-align: right; margin-left: auto; }
.chapter-nav .dir {
    display: flex;
    align-items: center;
    gap: 6px;
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--sheen);
    margin-bottom: 4px;
}
.chapter-nav .prev .dir { justify-content: flex-start; }
.chapter-nav .next .dir { justify-content: flex-end; }
.dir-arrow {
    width: 14px;
    height: 14px;
    flex: none;
}
.dir-arrow.flip { transform: scaleX(-1); }
.chapter-nav .label { font-size: 15px; color: var(--ink-70); }
.chapter-nav a:hover .label { color: var(--sheen); }

/* ---- Footer ---- */
.site-footer {
    max-width: 760px;
    margin: 0 auto;
    padding: 24px 24px 64px;
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.04em;
    color: var(--text-faint);
}
.site-footer p { margin: 0 0 4px; }
.site-footer .colophon { color: var(--ink-45); }