/* HTTP/3 client conformance — /conformance/
 *
 * No inline styles or handlers: the site CSP forbids both.
 *
 * The palette is the proxy pages' cool slate with a signal teal, kept quiet
 * deliberately. The page's job is to make a catalogue of 27 tests scannable and
 * an expectation legible next to the clause it cites; anything decorative
 * competes with that.
 */

:root {
    --cf-ground: #0b1016;
    --cf-surface: #131b23;
    --cf-surface-2: #1a242e;
    --cf-ink: #e2e9ef;
    --cf-ink-2: #b3c1cd;
    --cf-muted: #7f8f9d;
    --cf-border: #223039;
    --cf-accent: #46b5cb;
    --cf-accent-soft: #10323b;
    --cf-ext: #5cc191;
    --cf-corr: #f0868d;
    --cf-inter: #7fa9f0;
    --cf-resil: #dfb055;
    --cf-disc: #c39ae0;
    --cf-incon: #8697a4;
    --cf-mono: 'SFMono-Regular', ui-monospace, Menlo, Consolas, 'Liberation Mono', monospace;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html,
body {
    background: transparent;
    min-height: 100%;
}

body {
    background: var(--cf-ground);
    color: var(--cf-ink);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    font-size: 16px;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
}

/* A still, very faint grid. Static on purpose — this is a reference page, and
   an animated background on a table of 27 rows is noise. */
.cf-bg {
    position: fixed;
    inset: 0;
    z-index: -1;
    background-image:
        linear-gradient(var(--cf-border) 1px, transparent 1px),
        linear-gradient(90deg, var(--cf-border) 1px, transparent 1px);
    background-size: 64px 64px;
    opacity: 0.18;
    pointer-events: none;
}

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

a:focus-visible,
summary:focus-visible {
    outline: 2px solid var(--cf-accent);
    outline-offset: 2px;
    border-radius: 2px;
}

code {
    font-family: var(--cf-mono);
    font-size: 0.87em;
    background: var(--cf-surface-2);
    border: 1px solid var(--cf-border);
    border-radius: 3px;
    padding: 0.08em 0.34em;
    color: var(--cf-ink-2);
}

/* ── Header ─────────────────────────────────────────────────────────── */

.cf-header {
    border-bottom: 1px solid var(--cf-border);
    padding: 28px 0;
    background: rgba(11, 16, 22, 0.85);
}

.header-container {
    max-width: 1080px;
    margin: 0 auto;
    padding: 0 24px;
}

.header-content {
    display: flex;
    align-items: center;
    gap: 18px;
}

.logo-link {
    flex-shrink: 0;
    line-height: 0;
}

.logo-image {
    width: 52px;
    height: 52px;
    border-radius: 8px;
    border: 1px solid var(--cf-border);
}

.page-title {
    font-size: clamp(1.5rem, 3.6vw, 2.1rem);
    font-weight: 700;
    letter-spacing: -0.022em;
    line-height: 1.1;
    background: linear-gradient(135deg, var(--cf-accent), var(--cf-ext));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.page-subtitle {
    color: var(--cf-muted);
    font-size: 0.95rem;
    margin-top: 4px;
}

/* ── Main ───────────────────────────────────────────────────────────── */

.cf-main {
    max-width: 1080px;
    margin: 0 auto;
    padding: 40px 24px 80px;
}

.cf-lede p {
    font-size: 1.06rem;
    color: var(--cf-ink-2);
    max-width: 70ch;
    margin-bottom: 14px;
}

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

.cf-section {
    margin-top: 48px;
}

.cf-section h2 {
    font-size: 1.3rem;
    font-weight: 650;
    letter-spacing: -0.015em;
    margin-bottom: 12px;
}

.cf-sub {
    font-size: 1rem;
    font-weight: 600;
    color: var(--cf-ink-2);
    margin: 28px 0 10px;
    letter-spacing: 0.01em;
}

.cf-section p {
    color: var(--cf-ink-2);
    max-width: 70ch;
    margin-bottom: 14px;
}

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

.cf-note {
    font-size: 0.92rem;
    color: var(--cf-muted);
}

.cf-list {
    max-width: 70ch;
    padding-left: 20px;
    color: var(--cf-ink-2);
    margin-bottom: 14px;
}

.cf-list li {
    margin-bottom: 8px;
}

/* ── Summary numbers ────────────────────────────────────────────────── */

.cf-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 1px;
    background: var(--cf-border);
    border: 1px solid var(--cf-border);
    border-radius: 5px;
    overflow: hidden;
    margin-top: 32px;
}

.cf-stat {
    background: var(--cf-surface);
    padding: 16px 18px;
    display: flex;
    flex-direction: column;
    gap: 3px;
}

.cf-stat .v {
    font-size: 1.6rem;
    font-weight: 650;
    letter-spacing: -0.02em;
    line-height: 1;
    font-variant-numeric: tabular-nums;
    color: var(--cf-accent);
}

.cf-stat .k {
    font-family: var(--cf-mono);
    font-size: 0.68rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--cf-muted);
}

/* ── Runnable example ───────────────────────────────────────────────── */

.cf-pre {
    background: var(--cf-surface);
    border: 1px solid var(--cf-border);
    border-radius: 5px;
    padding: 16px 18px;
    overflow-x: auto;
    margin-bottom: 14px;
}

.cf-pre code {
    background: none;
    border: none;
    padding: 0;
    font-size: 0.84rem;
    line-height: 1.6;
    white-space: pre;
    color: var(--cf-ink-2);
}

/* ── Verdict classes ────────────────────────────────────────────────── */

.cf-classes {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 12px;
    margin: 22px 0;
}

.cf-class {
    background: var(--cf-surface);
    border: 1px solid var(--cf-border);
    border-left: 3px solid var(--cf-accent);
    border-radius: 4px;
    padding: 14px 16px;
}

.cf-class h3 {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.cf-class p {
    font-size: 0.9rem;
    color: var(--cf-muted);
    margin: 0;
    max-width: none;
}

.cf-class:nth-child(1) { border-left-color: var(--cf-ext); }
.cf-class:nth-child(2) { border-left-color: var(--cf-corr); }
.cf-class:nth-child(3) { border-left-color: var(--cf-inter); }
.cf-class:nth-child(4) { border-left-color: var(--cf-resil); }
.cf-class:nth-child(5) { border-left-color: var(--cf-disc); }
.cf-class-incon { border-left-color: var(--cf-incon) !important; }

/* ── Catalogue table ────────────────────────────────────────────────── */

.cf-tablewrap {
    overflow-x: auto;
    border: 1px solid var(--cf-border);
    border-radius: 5px;
    background: var(--cf-surface);
}

table {
    border-collapse: collapse;
    width: 100%;
    font-size: 0.9rem;
}

th {
    text-align: left;
    font-family: var(--cf-mono);
    font-size: 0.66rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--cf-muted);
    background: var(--cf-surface-2);
    padding: 10px 14px;
    border-bottom: 1px solid var(--cf-border);
    white-space: nowrap;
}

td {
    padding: 12px 14px;
    border-bottom: 1px solid var(--cf-border);
    color: var(--cf-ink-2);
    vertical-align: top;
}

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

td code {
    font-size: 0.8rem;
    display: inline-block;
    margin-bottom: 4px;
}

.cf-title {
    display: block;
    color: var(--cf-ink);
    font-weight: 500;
    margin-bottom: 3px;
}

/* The expectation, under every row, so a reader sees what a failure would
   actually mean without opening the RFC. */
.cf-expect {
    display: block;
    font-size: 0.84rem;
    color: var(--cf-muted);
    max-width: 62ch;
}

.cf-port {
    font-family: var(--cf-mono);
    font-variant-numeric: tabular-nums;
    color: var(--cf-ink);
    white-space: nowrap;
}

.cf-spec {
    font-family: var(--cf-mono);
    font-size: 0.8rem;
    white-space: nowrap;
    color: var(--cf-muted);
}

.cf-chip {
    display: inline-block;
    font-family: var(--cf-mono);
    font-size: 0.66rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    padding: 3px 8px;
    border-radius: 3px;
    white-space: nowrap;
    background: var(--cf-surface-2);
    color: var(--cf-muted);
    border: 1px solid var(--cf-border);
}

.cf-chip-extensibility { color: var(--cf-ext); border-color: var(--cf-ext); }
.cf-chip-correctness { color: var(--cf-corr); border-color: var(--cf-corr); }
.cf-chip-interoperability { color: var(--cf-inter); border-color: var(--cf-inter); }
.cf-chip-resilience { color: var(--cf-resil); border-color: var(--cf-resil); }
.cf-chip-discretionary { color: var(--cf-disc); border-color: var(--cf-disc); }

/* ── Catalogue unavailable ──────────────────────────────────────────── */

.cf-unavailable {
    background: var(--cf-surface);
    border: 1px solid var(--cf-border);
    border-left: 3px solid var(--cf-resil);
    border-radius: 4px;
    padding: 20px 22px;
    margin-top: 32px;
}

.cf-unavailable h2 {
    font-size: 1.05rem;
    margin-bottom: 8px;
}

.cf-unavailable p {
    color: var(--cf-ink-2);
    margin: 0;
    max-width: 70ch;
}

/* ── Footer ─────────────────────────────────────────────────────────── */

.cf-footer {
    border-top: 1px solid var(--cf-border);
    padding: 28px 0 48px;
}

.footer-container {
    max-width: 1080px;
    margin: 0 auto;
    padding: 0 24px;
}

.footer-links {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 10px 22px;
    margin-bottom: 12px;
}

.footer-link {
    font-size: 0.9rem;
}

.footer-note {
    font-size: 0.85rem;
    color: var(--cf-muted);
    max-width: 70ch;
}

@media (max-width: 640px) {
    .cf-main {
        padding: 28px 16px 60px;
    }

    .header-container,
    .footer-container {
        padding: 0 16px;
    }

    .cf-classes {
        grid-template-columns: 1fr;
    }
}

@media (prefers-reduced-motion: reduce) {
    * {
        animation: none !important;
        transition: none !important;
    }
}