/* ML Weft — w3ft.org
   One stylesheet, no build step. Tokens on :root; dark theme via
   prefers-color-scheme unless the reader picks one ([data-theme]). */

:root {
  --bg: #f4f6fa;
  --bg-2: #e9edf4;
  --surface: #ffffff;
  --ink: #0b1220;
  --ink-2: #26314a;
  --muted: #56617a;
  --line: #d8dee8;
  --line-2: #c2cbd9;
  --accent: #0e7490;          /* signal cyan, AA on light */
  --accent-strong: #155e75;
  --accent-soft: #dcf2f7;
  --indigo: #4c3fd1;
  --indigo-soft: #e7e5fb;
  --ok: #047857;
  --ok-soft: #d9f2e8;
  --warn: #a1530a;
  --warn-soft: #fbebd6;
  --no: #5e6880;
  --no-soft: #e7eaf0;
  --bad: #b42323;
  --bad-soft: #fbe1e1;
  --code-bg: #edf1f7;
  --shadow: 0 1px 2px rgb(11 18 32 / 0.05), 0 8px 24px rgb(11 18 32 / 0.06);
  --thread-a: #0e8aa8;
  --thread-b: #6d3fd8;
  --thread-warp: #cfd6e2;

  --font-display: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", "URW Palladio L", Georgia, serif;
  --font-body: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;

  --radius: 10px;
  --radius-sm: 6px;
  --gutter: clamp(16px, 4vw, 40px);
  --max: 1120px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #060a12;
    --bg-2: #0a0f1a;
    --surface: #0e1522;
    --ink: #e6ecf5;
    --ink-2: #c2ccdb;
    --muted: #8a96ab;
    --line: #1b2436;
    --line-2: #29344b;
    --accent: #3fd0e8;
    --accent-strong: #7ee3f3;
    --accent-soft: #0b2833;
    --indigo: #aeb4ff;
    --indigo-soft: #1c1f45;
    --ok: #4ad6a0;
    --ok-soft: #0d2b20;
    --warn: #f4bb55;
    --warn-soft: #33240c;
    --no: #8a96ab;
    --no-soft: #1a2130;
    --bad: #ff8b8b;
    --bad-soft: #3a1518;
    --code-bg: #09101c;
    --shadow: 0 1px 2px rgb(0 0 0 / 0.45), 0 8px 24px rgb(0 0 0 / 0.3);
    --thread-a: #33c4de;
    --thread-b: #9b7cf6;
    --thread-warp: #182133;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #060a12;
  --bg-2: #0a0f1a;
  --surface: #0e1522;
  --ink: #e6ecf5;
  --ink-2: #c2ccdb;
  --muted: #8a96ab;
  --line: #1b2436;
  --line-2: #29344b;
  --accent: #3fd0e8;
  --accent-strong: #7ee3f3;
  --accent-soft: #0b2833;
  --indigo: #aeb4ff;
  --indigo-soft: #1c1f45;
  --ok: #4ad6a0;
  --ok-soft: #0d2b20;
  --warn: #f4bb55;
  --warn-soft: #33240c;
  --no: #8a96ab;
  --no-soft: #1a2130;
  --bad: #ff8b8b;
  --bad-soft: #3a1518;
  --code-bg: #09101c;
  --shadow: 0 1px 2px rgb(0 0 0 / 0.45), 0 8px 24px rgb(0 0 0 / 0.3);
  --thread-a: #33c4de;
  --thread-b: #9b7cf6;
  --thread-warp: #182133;
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 72px; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 400 17px/1.6 var(--font-body);
  overflow-x: hidden;
  text-rendering: optimizeLegibility;
}
img, svg, canvas { display: block; max-width: 100%; }
a { color: var(--indigo); text-underline-offset: 0.18em; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }
code, kbd, pre { font-family: var(--font-mono); font-size: 0.88em; }
:not(pre) > code { background: var(--code-bg); border: 1px solid var(--line); padding: 0.08em 0.36em; border-radius: 4px; overflow-wrap: anywhere; }
h1, h2, h3 { font-family: var(--font-display); font-weight: 600; line-height: 1.15; letter-spacing: -0.01em; margin: 0; color: var(--ink); }
h2 { font-size: clamp(1.75rem, 1.2rem + 2vw, 2.5rem); }
h3 { font-size: 1.25rem; }
p { margin: 0 0 1em; }
.visually-hidden { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: 12px; top: -48px; z-index: 100; background: var(--ink); color: var(--bg); padding: 8px 12px; border-radius: var(--radius-sm); }
.skip:focus { top: 12px; }

.wrap { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 var(--gutter); }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: saturate(1.4) blur(12px);
  -webkit-backdrop-filter: saturate(1.4) blur(12px);
  border-bottom: 1px solid var(--line);
}
.site-header .wrap { display: flex; align-items: center; gap: 16px; height: 60px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; margin-right: auto; }
.brand svg { width: 26px; height: 26px; }
.brand-name { font-family: var(--font-display); font-weight: 700; font-size: 1.15rem; letter-spacing: 0.01em; }
.brand-org { font-size: 0.78rem; color: var(--muted); border-left: 1px solid var(--line-2); padding-left: 10px; }
.nav { display: flex; align-items: center; gap: 4px; }
.nav a { color: var(--ink-2); text-decoration: none; font-size: 0.93rem; padding: 6px 10px; border-radius: var(--radius-sm); }
.nav a:hover { background: var(--bg-2); color: var(--ink); }
.icon-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  height: 36px; min-width: 36px; padding: 0 10px;
  border: 1px solid var(--line-2); border-radius: var(--radius-sm);
  background: var(--surface); color: var(--ink); font: 500 0.9rem var(--font-body);
  text-decoration: none; cursor: pointer;
}
.icon-btn:hover { border-color: var(--accent); }
.icon-btn svg { width: 18px; height: 18px; }
.menu { display: none; position: relative; }
.menu > summary { list-style: none; }
.menu > summary::-webkit-details-marker { display: none; }
.menu-panel {
  position: absolute; right: 0; top: calc(100% + 8px); min-width: 200px;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 6px; display: grid;
}
.menu-panel a { padding: 10px 12px; border-radius: var(--radius-sm); color: var(--ink); text-decoration: none; }
.menu-panel a:hover { background: var(--bg-2); }
@media (max-width: 860px) {
  .nav { display: none; }
  .menu { display: block; }
  .brand-org { display: none; }
}
.theme-toggle .sun { display: none; }
:root[data-theme="dark"] .theme-toggle .sun { display: block; }
:root[data-theme="dark"] .theme-toggle .moon { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .sun { display: block; }
  :root:not([data-theme="light"]) .theme-toggle .moon { display: none; }
}

/* ---------- Hero ---------- */
.hero { position: relative; overflow: hidden; border-bottom: 1px solid var(--line); }
.hero canvas {
  position: absolute; inset: 0; width: 100%; height: 100%;
  opacity: 0.85;
  -webkit-mask-image: linear-gradient(90deg, transparent 0 42%, rgb(0 0 0 / 0.5) 62%, #000 88%);
          mask-image: linear-gradient(90deg, transparent 0 42%, rgb(0 0 0 / 0.5) 62%, #000 88%);
}
.hero .wrap { position: relative; padding-top: clamp(56px, 10vw, 120px); padding-bottom: clamp(56px, 9vw, 112px); }
.kicker { display: inline-flex; flex-wrap: wrap; align-items: center; gap: 8px; font-size: 0.82rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); margin-bottom: 18px; }
.kicker .dot { width: 8px; height: 8px; border-radius: 50%; background: linear-gradient(135deg, var(--thread-a), var(--thread-b)); }
.hero h1 { font-size: clamp(3rem, 2rem + 6vw, 6rem); letter-spacing: -0.025em; line-height: 0.95; }
.hero h1 .thin { color: var(--muted); font-weight: 400; }
.tagline { font-family: var(--font-display); font-style: italic; font-size: clamp(1.3rem, 1rem + 1.4vw, 1.9rem); color: var(--accent); margin: 12px 0 22px; }
.lede { font-size: clamp(1.05rem, 0.98rem + 0.4vw, 1.25rem); max-width: 40rem; color: var(--ink-2); }
.cta { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px; }
.btn {
  display: inline-flex; align-items: center; gap: 8px; min-height: 44px; padding: 0 18px;
  border-radius: var(--radius-sm); border: 1px solid var(--line-2);
  font: 600 0.98rem var(--font-body); text-decoration: none; color: var(--ink); background: var(--surface);
  cursor: pointer;
}
.btn:hover { border-color: var(--accent); }
.btn svg { width: 18px; height: 18px; }
.btn-primary { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.btn-primary:hover { background: var(--ink-2); border-color: var(--ink-2); }
.hero-meta { display: flex; flex-wrap: wrap; gap: 8px 18px; margin-top: 28px; font-size: 0.88rem; color: var(--muted); }
.hero-meta span { display: inline-flex; align-items: center; gap: 6px; }

/* ---------- Sections ---------- */
section.block { padding: clamp(56px, 8vw, 104px) 0; border-bottom: 1px solid var(--line); }
section.alt { background: var(--bg-2); }
.section-head { max-width: 44rem; margin-bottom: clamp(28px, 4vw, 44px); }
.eyebrow { font: 600 0.78rem var(--font-mono); letter-spacing: 0.1em; text-transform: uppercase; color: var(--accent); margin-bottom: 10px; display: block; }
.section-head p { color: var(--ink-2); font-size: 1.08rem; margin-top: 14px; }

.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; }
@media (max-width: 960px) { .grid-3, .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 640px) { .grid-3, .grid-2, .grid-4 { grid-template-columns: minmax(0, 1fr); } }

.card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: clamp(18px, 2.4vw, 26px); box-shadow: var(--shadow); min-width: 0;
}
.card h3 { margin-bottom: 8px; }
.card p { color: var(--ink-2); }
.card .path { font: 0.82rem var(--font-mono); color: var(--muted); }
.card .glyph { width: 40px; height: 40px; margin-bottom: 14px; color: var(--accent); }

/* ---------- Demos ---------- */
.demo { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); gap: clamp(18px, 3vw, 32px); align-items: start; }
@media (max-width: 860px) { .demo { grid-template-columns: minmax(0, 1fr); } }
.demo + .demo { margin-top: clamp(40px, 6vw, 72px); }
.demo-copy h3 { font-size: 1.5rem; margin-bottom: 10px; }
.demo-copy p { color: var(--ink-2); }
.demo-copy .source { font-size: 0.88rem; color: var(--muted); }
.panel { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: clamp(16px, 2.2vw, 22px); min-width: 0; }

.gate-viz { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 18px; align-items: center; }
@media (max-width: 420px) { .gate-viz { grid-template-columns: minmax(0, 1fr); justify-items: center; } }
#gateMatrix { width: 168px; height: 168px; border-radius: var(--radius-sm); border: 1px solid var(--line); image-rendering: pixelated; }
.meter { margin-bottom: 12px; }
.meter-label { display: flex; justify-content: space-between; gap: 8px; font-size: 0.85rem; color: var(--muted); margin-bottom: 4px; }
.meter-label b { font: 600 0.85rem var(--font-mono); color: var(--ink); }
.meter-track { position: relative; height: 10px; background: var(--bg-2); border: 1px solid var(--line); border-radius: 999px; overflow: hidden; }
.meter-fill { position: absolute; inset: 0 auto 0 0; width: 0; background: var(--indigo); border-radius: 999px; transition: width 0.25s ease, background 0.25s ease; }
.meter-fill.over { background: var(--bad); }
.meter-mark { position: absolute; top: -2px; bottom: -2px; width: 2px; background: var(--ink); }
.controls { display: flex; flex-wrap: wrap; gap: 8px; margin: 16px 0 14px; }
.controls .btn { min-height: 38px; padding: 0 12px; font-size: 0.9rem; }
.range { display: grid; grid-template-columns: auto minmax(0, 1fr) auto; gap: 10px; align-items: center; font-size: 0.88rem; color: var(--muted); }
.range input { width: 100%; accent-color: var(--accent); }
.range output { font: 600 0.88rem var(--font-mono); color: var(--ink); min-width: 3.5ch; text-align: right; }
.verdicts { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 10px; margin-top: 14px; }
@media (max-width: 480px) { .verdicts { grid-template-columns: minmax(0, 1fr); } }
.verdict { border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 10px 12px; background: var(--bg); }
.verdict .who { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); }
.verdict .what { font: 0.78rem var(--font-mono); color: var(--muted); margin: 2px 0 6px; overflow-wrap: anywhere; }
.verdict .result { font-weight: 700; }
.verdict.pass .result { color: var(--ok); }
.verdict.fail .result { color: var(--bad); }
.verdict.pass { border-color: color-mix(in srgb, var(--ok) 40%, var(--line)); }
.verdict.fail { border-color: color-mix(in srgb, var(--bad) 45%, var(--line)); }
.log { margin-top: 12px; font: 0.82rem/1.5 var(--font-mono); color: var(--muted); min-height: 1.5em; }

.packet-input {
  width: 100%; min-height: 96px; resize: vertical; padding: 12px;
  font: 0.86rem/1.5 var(--font-mono); color: var(--ink); background: var(--code-bg);
  border: 1px solid var(--line-2); border-radius: var(--radius-sm); overflow-wrap: anywhere; word-break: break-all;
}
.packet-status { display: flex; align-items: center; gap: 8px; margin: 12px 0; font-weight: 600; }
.packet-status .badge { font: 600 0.78rem var(--font-mono); padding: 3px 8px; border-radius: 999px; }
.badge.ok { background: var(--ok-soft); color: var(--ok); }
.badge.bad { background: var(--bad-soft); color: var(--bad); }
.kv { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 4px 14px; font-size: 0.88rem; margin: 0; }
.kv dt { color: var(--muted); }
.kv dd { margin: 0; font-family: var(--font-mono); overflow-wrap: anywhere; }

.mixer { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 18px; align-items: center; }
@media (max-width: 560px) { .mixer { grid-template-columns: minmax(0, 1fr); justify-items: center; } }
.simplex-pad { width: 220px; height: 220px; touch-action: none; cursor: crosshair; }
.simplex-guide { stroke: var(--line-2); stroke-width: 0.6; }
.simplex-edge { fill: color-mix(in srgb, var(--accent) 6%, transparent); stroke: var(--ink-2); stroke-width: 1.2; }
.simplex-vertex { fill: var(--accent); }
.simplex-label { fill: var(--muted); font: 11px var(--font-mono); }
.simplex-spoke { stroke: var(--accent); stroke-width: 1.2; }
.simplex-knob { fill: var(--surface); stroke: var(--accent); stroke-width: 3; }
.preview {
  --p-hue: 40; --p-round: 10px; --p-pad: 18px; --p-contrast: 0.1;
  width: 100%; border: 1px solid hsl(var(--p-hue) 45% 50% / 0.45); border-radius: var(--p-round);
  padding: var(--p-pad); background: hsl(var(--p-hue) 60% 50% / calc(0.06 + var(--p-contrast)));
  transition: border-radius 0.2s ease, padding 0.2s ease, background 0.2s ease;
}
.preview h4 { margin: 0 0 6px; font: 600 1.1rem var(--font-display); color: hsl(var(--p-hue) 55% 42%); }
:root[data-theme="dark"] .preview h4 { color: hsl(var(--p-hue) 80% 72%); }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .preview h4 { color: hsl(var(--p-hue) 80% 72%); } }
.preview p { font-size: 0.92rem; color: var(--ink-2); margin-bottom: 10px; }
.preview .chip { display: inline-block; padding: 4px 10px; border-radius: calc(var(--p-round) * 0.8 + 2px); background: hsl(var(--p-hue) 70% 50%); color: #fff; font-size: 0.82rem; font-weight: 600; }
.mix-readout { margin-top: 12px; font: 0.8rem var(--font-mono); color: var(--muted); overflow-wrap: anywhere; }

/* ---------- Status table ---------- */
.status-table { width: 100%; border-collapse: collapse; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
.status-table th, .status-table td { text-align: left; vertical-align: top; padding: 14px 16px; border-bottom: 1px solid var(--line); }
.status-table tr:last-child td { border-bottom: 0; }
.status-table th { font: 600 0.78rem var(--font-mono); letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); background: var(--bg-2); }
.status-table td:first-child { white-space: nowrap; }
.status-table .name { font-weight: 600; }
.status-table .path { display: block; font: 0.78rem var(--font-mono); color: var(--muted); }
.status-table .note { display: block; font-size: 0.85rem; color: var(--muted); margin-top: 2px; }
.pill { display: inline-block; white-space: nowrap; font: 600 0.76rem var(--font-mono); padding: 3px 9px; border-radius: 999px; }
.pill.run { background: var(--ok-soft); color: var(--ok); }
.pill.sim { background: var(--indigo-soft); color: var(--indigo); }
.pill.draft { background: var(--warn-soft); color: var(--warn); }
.pill.idea { background: var(--no-soft); color: var(--no); }
@media (max-width: 720px) {
  .status-table thead { display: none; }
  .status-table, .status-table tbody, .status-table tr, .status-table td { display: block; width: 100%; }
  .status-table tr { border-bottom: 1px solid var(--line); padding: 10px 0; }
  .status-table td { border: 0; padding: 4px 16px; white-space: normal !important; }
}
.legend { display: flex; flex-wrap: wrap; gap: 10px 18px; margin-top: 16px; font-size: 0.86rem; color: var(--muted); }
.not-built { margin-top: 18px; font-size: 0.95rem; color: var(--ink-2); }

/* ---------- Horizons ---------- */
.horizon { position: relative; padding-top: 22px; }
.horizon::before { content: ""; position: absolute; top: 0; left: 0; right: 0; height: 3px; border-radius: 3px; background: var(--line-2); }
.horizon.h-now::before { background: var(--ok); }
.horizon.h-wip::before { background: linear-gradient(90deg, var(--ok) 0 45%, var(--line-2) 45%); }
.horizon .num { font: 600 0.78rem var(--font-mono); color: var(--muted); letter-spacing: 0.08em; }
.horizon h3 { margin: 6px 0 8px; }
.horizon p { font-size: 0.95rem; color: var(--ink-2); }
.horizon .pill { margin-top: 4px; }

/* ---------- Callout ---------- */
.callout {
  display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 16px; align-items: start;
  border: 1px solid color-mix(in srgb, var(--warn) 40%, var(--line)); background: var(--warn-soft);
  border-radius: var(--radius); padding: clamp(18px, 2.4vw, 24px);
}
.callout svg { width: 28px; height: 28px; color: var(--warn); }
.callout h3 { margin-bottom: 6px; }
.callout p { margin: 0; color: var(--ink-2); }

/* ---------- Code ---------- */
.codeblock { position: relative; background: var(--code-bg); border: 1px solid var(--line); border-radius: var(--radius); }
.codeblock pre { margin: 0; padding: 18px 20px; overflow-x: auto; line-height: 1.7; }
.codeblock .copy { position: absolute; top: 10px; right: 10px; }
.codeblock .c { color: var(--muted); }

/* ---------- Lists of links ---------- */
.linklist { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.linklist a { display: flex; justify-content: space-between; gap: 12px; padding: 12px 14px; border: 1px solid var(--line); border-radius: var(--radius-sm); background: var(--surface); color: var(--ink); text-decoration: none; }
.linklist a:hover { border-color: var(--accent); }
.linklist .meta { color: var(--muted); font-size: 0.86rem; text-align: right; }
.linklist .t { font-weight: 600; }
.linklist .d { display: block; color: var(--muted); font-size: 0.88rem; font-weight: 400; }

/* ---------- Footer ---------- */
.site-footer { padding: 48px 0 56px; color: var(--muted); font-size: 0.92rem; }
.site-footer .wrap { display: grid; grid-template-columns: minmax(0, 1.4fr) repeat(2, minmax(0, 1fr)); gap: 28px; }
@media (max-width: 720px) { .site-footer .wrap { grid-template-columns: minmax(0, 1fr); } }
.site-footer h4 { margin: 0 0 10px; font: 600 0.78rem var(--font-mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-2); }
.site-footer ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.site-footer a { color: var(--ink-2); }
.site-footer .brand { margin-bottom: 10px; }

/* ---------- Simple pages (404, widgets) ---------- */
.simple { min-height: 70vh; display: grid; align-content: center; padding: 64px 0; }
.simple h1 { font-size: clamp(2.4rem, 1.6rem + 4vw, 4rem); margin-bottom: 12px; }
.widget-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 320px), 1fr)); gap: 18px; }
.widget-card { padding: 0; overflow: hidden; }
.widget-card iframe { width: 100%; aspect-ratio: 16 / 10; border: 0; display: block; background: #000; }
.widget-card .body { padding: 16px 18px 18px; }
.widget-card h3 { font-size: 1.1rem; margin-bottom: 6px; }
.widget-card p { font-size: 0.92rem; margin: 0 0 8px; }
@media (max-width: 700px) {
  .hero canvas { opacity: 0.22; -webkit-mask-image: none; mask-image: none; }
}