/* ---------- tokens ---------- */
:root {
  --bg: #f6f7fb;
  --surface: #ffffff;
  --surface-2: #eef0f6;
  --border: #dde1ec;
  --text: #171a26;
  --muted: #5d6478;
  --accent: #5b4cdb;
  --focus: #5b4cdb;
  --shadow: 0 1px 2px rgba(20, 24, 40, .06), 0 6px 20px rgba(20, 24, 40, .06);

  /* layer colours, matching the explainer's text-safe inks: strong (lines/text) + soft (fills) */
  --l1: #6b4f33; --l1-soft: #f3ece4;
  --l2: #b02020; --l2-soft: #fde8e8;
  --l3: #9c4209; --l3-soft: #fdeedf;
  --l4: #735800; --l4-soft: #fcf4d6;
  --l5: #1b6e34; --l5-soft: #e3f4e7;
  --l6: #0a6566; --l6-soft: #dcf3f3;
  --l7: #1b56b8; --l7-soft: #e4eefd;
  --l8: #5438bd; --l8-soft: #eee9fd;
  --l9: #a1236f; --l9-soft: #fbe6f2;
  --cc: #474e60; --cc-soft: #eceef3;
  --ok: #2c9a4b;         --ok-soft: #e2f5e7;
  --bad: #d0445e;

  --dg-box: #ffffff;
  --dg-stroke: #b8bfd3;
  --dg-edge: #7a8299;
  --dg-bar: #7c5ce6;

  --radius: 12px;
  --font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0d1020; --surface: #151a2d; --surface-2: #1c2238; --border: #2a3150;
    --text: #e7e9f3; --muted: #9aa2bd; --accent: #a594ff; --focus: #a594ff;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .25);
    --l1: #dcc09c; --l1-soft: #2b2219;
    --l2: #ff9a9a; --l2-soft: #3a1a1d;
    --l3: #ffb27c; --l3-soft: #3a2414;
    --l4: #f3d36a; --l4-soft: #332a0d;
    --l5: #7fdc98; --l5-soft: #15301f;
    --l6: #6cdcdc; --l6-soft: #0f2e30;
    --l7: #9cc0ff; --l7-soft: #16264a;
    --l8: #bfb0ff; --l8-soft: #251f48;
    --l9: #f69ad3; --l9-soft: #3a1830;
    --cc: #c0c6d6; --cc-soft: #1f2438;
    --ok: #4fcf73;         --ok-soft: #143220;
    --bad: #f2718a;
    --dg-box: #1c2238; --dg-stroke: #3a4366; --dg-edge: #8891ad; --dg-bar: #a58cff;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0d1020; --surface: #151a2d; --surface-2: #1c2238; --border: #2a3150;
  --text: #e7e9f3; --muted: #9aa2bd; --accent: #a594ff; --focus: #a594ff;
  --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .25);
  --l1: #dcc09c; --l1-soft: #2b2219;
  --l2: #ff9a9a; --l2-soft: #3a1a1d;
  --l3: #ffb27c; --l3-soft: #3a2414;
  --l4: #f3d36a; --l4-soft: #332a0d;
  --l5: #7fdc98; --l5-soft: #15301f;
  --l6: #6cdcdc; --l6-soft: #0f2e30;
  --l7: #9cc0ff; --l7-soft: #16264a;
  --l8: #bfb0ff; --l8-soft: #251f48;
  --l9: #f69ad3; --l9-soft: #3a1830;
  --cc: #c0c6d6; --cc-soft: #1f2438;
  --ok: #4fcf73;         --ok-soft: #143220;
  --bad: #f2718a;
  --dg-box: #1c2238; --dg-stroke: #3a4366; --dg-edge: #8891ad; --dg-bar: #a58cff;
  color-scheme: dark;
}

/* per-layer colour binding: the nine layers of the model, plus the cross-cutting band */
.l-physical-energy { --c: var(--l1); --c-soft: var(--l1-soft); }
.l-compute-hardware { --c: var(--l2); --c-soft: var(--l2-soft); }
.l-cloud-infrastructure { --c: var(--l3); --c-soft: var(--l3-soft); }
.l-data { --c: var(--l4); --c-soft: var(--l4-soft); }
.l-foundation-models { --c: var(--l5); --c-soft: var(--l5-soft); }
.l-inference-optimization { --c: var(--l6); --c-soft: var(--l6-soft); }
.l-orchestration-tooling { --c: var(--l7); --c-soft: var(--l7-soft); }
.l-agents { --c: var(--l8); --c-soft: var(--l8-soft); }
.l-applications-interfaces { --c: var(--l9); --c-soft: var(--l9-soft); }
.l-security { --c: var(--cc); --c-soft: var(--cc-soft); }

/* ---------- base ---------- */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  overflow-wrap: break-word;
  margin: 0; background: var(--bg); color: var(--text);
  font: 15px/1.55 var(--font); -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); }
h1, h2, h3 { line-height: 1.2; margin: 0; }
h1 { font-size: clamp(1.5rem, 3vw, 2rem); letter-spacing: -.02em; }
h2 { font-size: clamp(1.3rem, 2.5vw, 1.6rem); letter-spacing: -.01em; }
h3 { font-size: 1rem; }
p { margin: .4em 0; }
button { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; border-radius: 6px; }
.muted { color: var(--muted); font-weight: 400; }
.small { font-size: .85rem; }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* ---------- top bar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 30;
  display: flex; align-items: center; gap: 16px; flex-wrap: wrap;
  padding: 10px max(16px, calc((100vw - 1320px) / 2));
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(10px); border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; }
.brand img { width: 40px; height: 40px; }
.brand strong { font-size: 1.35rem; }
.brand-sub { display: block; color: var(--accent); font-size: .85rem; font-weight: 600; }
.status { color: var(--muted); font-size: .85rem; flex: 1; min-width: 180px; }
.status .pill-new { background: var(--accent); color: #fff; border-radius: 999px; padding: 1px 8px; font-weight: 600; font-size: .78rem; text-decoration: none; }
.top-actions { position: relative; display: flex; gap: 8px; align-items: center; }
.search input {
  width: min(320px, 60vw); padding: 8px 12px; border-radius: 10px;
  border: 1px solid var(--border); background: var(--surface); color: var(--text); font: inherit;
}
.search-results {
  position: absolute; top: calc(100% + 6px); right: 0; width: min(420px, calc(100vw - 32px));
  max-height: 60vh; overflow: auto; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow); padding: 6px; z-index: 40;
}
.search-results button {
  display: block; width: 100%; text-align: left; background: none; border: 0; padding: 8px 10px;
  border-radius: 8px; cursor: pointer;
}
.search-results button:hover, .search-results button:focus-visible { background: var(--surface-2); }
.search-results .sr-kind { font-size: .75rem; color: var(--muted); }
.search-results .sr-head { font-size: .72rem; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); padding: 6px 10px 2px; }
.icon-btn {
  border: 1px solid var(--border); background: var(--surface); border-radius: 10px;
  width: 36px; height: 36px; cursor: pointer; display: grid; place-items: center; font-size: 1rem;
}

.try-next {
  border: 1px solid var(--border); background: var(--surface); border-radius: 10px; height: 36px; padding: 0 12px;
  display: inline-flex; align-items: center; white-space: nowrap; font-size: .9rem; font-weight: 600; text-decoration: none; color: var(--text);
}
.try-next:hover, .try-next:focus-visible { background: var(--surface-2); }
.try-short { display: none; }
@media (max-width: 640px) { .try-next { font-size: .8rem; padding: 0 8px; } .try-long { display: none; } .try-short { display: inline; } }

/* ---------- sections ---------- */
main { padding: 0 16px; }
.section { max-width: 1320px; margin: 28px auto 40px; }
.section-head { display: flex; justify-content: space-between; align-items: flex-end; gap: 20px; flex-wrap: wrap; margin-bottom: 16px; }
.lede { color: var(--muted); max-width: 70ch; }
.legend { display: flex; gap: 12px; flex-wrap: wrap; font-size: .8rem; color: var(--muted); }
.legend span { display: inline-flex; align-items: center; gap: 6px; }
.legend i { width: 10px; height: 10px; border-radius: 3px; background: var(--c); display: inline-block; }

/* ---------- chips ---------- */
.filter-row .sep { width: 1px; height: 18px; background: var(--border); margin: 0 6px; }
.chip {
  display: inline-flex; align-items: center; gap: 6px; padding: 4px 10px; border-radius: 999px;
  background: var(--c-soft); color: var(--text); border: 1px solid color-mix(in srgb, var(--c) 30%, transparent);
  font-size: .8rem; cursor: pointer; white-space: nowrap; text-decoration: none;
}
.chip:hover { border-color: var(--c); }
.chip .n { font-variant-numeric: tabular-nums; background: var(--c); color: var(--surface); border-radius: 999px; padding: 0 6px; font-size: .72rem; font-weight: 700; }
.heat { font-variant-numeric: tabular-nums; font-weight: 700; }

/* ---------- diagrams ---------- */
.diagram { margin: 12px 0; }
.dg-scroll { overflow-x: auto; background: var(--surface-2); border-radius: 10px; padding: 12px; }
.dg-svg { display: block; width: 100%; min-width: 520px; height: auto; font-family: var(--font); }
.diagram figcaption { font-size: .78rem; color: var(--muted); margin-top: 6px; }
.dg-box { fill: var(--dg-box); stroke: var(--dg-stroke); stroke-width: 1.2; }
.dg-label { fill: var(--text); font-weight: 650; }
.dg-sub { fill: var(--muted); }
.dg-edge { stroke: var(--dg-edge); stroke-width: 1.6; fill: none; }
.dg-return { stroke-dasharray: 5 4; }
.dg-spoke { stroke-dasharray: 3 4; }
.dg-lifeline { stroke: var(--dg-stroke); stroke-dasharray: 4 5; }
.dg-arrowhead { fill: var(--dg-edge); }
.dg-hl .dg-box, .dg-end .dg-box { fill: var(--c-soft, var(--surface-2)); stroke: var(--c, var(--accent)); stroke-width: 1.6; }
.dg-dim .dg-box { opacity: .55; }
.dg-dim text { opacity: .7; }
.dg-bar { fill: var(--c, var(--dg-bar)); opacity: .85; }
.dg-divider { stroke: var(--dg-stroke); }
.dg-bullet { fill: var(--c, var(--accent)); }
.dg-col0 .dg-box, .dg-col1 .dg-box, .dg-col2 .dg-box { fill: var(--dg-box); }
.dg-col0 .dg-label { fill: var(--c, var(--accent)); }

/* ---------- drawer ---------- */
.drawer-backdrop { position: fixed; inset: 0; background: rgba(8, 10, 20, .45); z-index: 50; }
.drawer {
  position: fixed; top: 0; right: 0; bottom: 0; z-index: 60; width: min(640px, 100vw);
  background: var(--surface); border-left: 1px solid var(--border); box-shadow: var(--shadow);
  display: none; overflow-y: auto; padding: 22px 22px 40px;
}
.drawer.open { display: block; animation: slideIn .25s ease; }
@keyframes slideIn { from { transform: translateX(100%); } to { transform: none; } }
.drawer-close { position: sticky; top: 0; float: right; z-index: 2; }
.crumbs { font-size: .78rem; color: var(--muted); margin-bottom: 6px; }
.crumbs button { background: none; border: 0; padding: 0; color: var(--c); cursor: pointer; font-size: inherit; }
.drawer h2 { margin-bottom: 6px; padding-right: 44px; }
.badges { display: flex; gap: 6px; flex-wrap: wrap; margin: 6px 0 10px; }
.badge { font-size: .72rem; border-radius: 999px; padding: 2px 9px; background: var(--c-soft); color: var(--text); border: 1px solid color-mix(in srgb, var(--c) 35%, transparent); }
.summary-lg { font-size: 1.05rem; font-weight: 500; }
.why { background: var(--c-soft); border-left: 3px solid var(--c); padding: 10px 14px; border-radius: 0 10px 10px 0; margin: 14px 0; }
.why strong { display: block; font-size: .72rem; text-transform: uppercase; letter-spacing: .08em; color: var(--c); }
.drawer h3 { margin: 20px 0 8px; font-size: .8rem; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); }
.related { display: flex; gap: 6px; flex-wrap: wrap; }
.links a { margin-right: 14px; }
.learn-toggle { margin-top: 10px; border: 1px solid var(--border); background: var(--surface-2); border-radius: 999px; padding: 6px 14px; cursor: pointer; }
.learn-toggle[aria-pressed="true"] { background: var(--ok-soft); border-color: var(--ok); }
.mini-news { list-style: none; padding: 0; margin: 0; }
.mini-news li { padding: 8px 0; border-bottom: 1px solid var(--border); }
.mini-news a { color: var(--text); text-decoration: none; font-weight: 550; }
.mini-news a:hover { color: var(--accent); }
.mini-news .meta { font-size: .75rem; color: var(--muted); }

/* ---------- news ---------- */
.news-layout { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 20px; align-items: start; }
.filters { display: flex; flex-direction: column; gap: 8px; margin-bottom: 12px; }
.filter-row { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.filter-row .lbl { font-size: .72rem; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); width: 58px; }
.fbtn {
  border: 1px solid var(--border); background: var(--surface); border-radius: 999px; padding: 4px 11px;
  font-size: .8rem; cursor: pointer; display: inline-flex; gap: 6px; align-items: center;
}
.fbtn[aria-pressed="true"] { background: var(--text); color: var(--bg); border-color: var(--text); }
.fbtn i { width: 8px; height: 8px; border-radius: 50%; background: var(--c); display: inline-block; }
.active-filter { font-size: .85rem; margin-bottom: 10px; }
.active-filter button { margin-left: 8px; }
.news-list { display: flex; flex-direction: column; gap: 10px; }
.news-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 12px 14px; box-shadow: var(--shadow); position: relative;
}
.news-card.is-new { border-left: 3px solid var(--accent); }
.news-card .meta { font-size: .76rem; color: var(--muted); display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.news-card h3 { font-size: 1rem; margin: 4px 0; }
.news-card h3 a { color: var(--text); text-decoration: none; }
.news-card h3 a:hover { color: var(--accent); text-decoration: underline; }
.news-card p, .news-card h3 { overflow-wrap: anywhere; }
.news-card p { font-size: .87rem; color: var(--muted); margin: 2px 0 8px; }
.news-card .tags { display: flex; gap: 6px; flex-wrap: wrap; }
.news-card .tags .chip { font-size: .74rem; padding: 2px 8px; }
.src-type { font-size: .66rem; text-transform: uppercase; letter-spacing: .08em; padding: 1px 6px; border-radius: 4px; background: var(--surface-2); color: var(--muted); }
.new-dot { font-size: .66rem; font-weight: 700; color: var(--accent); text-transform: uppercase; letter-spacing: .08em; }
.more-btn { margin: 14px auto; display: block; border: 1px solid var(--border); background: var(--surface); padding: 8px 18px; border-radius: 999px; cursor: pointer; }
.empty { padding: 30px; text-align: center; color: var(--muted); background: var(--surface); border: 1px dashed var(--border); border-radius: var(--radius); }
.empty code { font-family: var(--mono); font-size: .85em; background: var(--surface-2); padding: 1px 5px; border-radius: 4px; }

.news-side { display: flex; flex-direction: column; gap: 14px; position: sticky; top: 74px; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px; box-shadow: var(--shadow); }
.card h3 { margin-bottom: 8px; }
.card summary { cursor: pointer; list-style: none; }
.card summary h3 { display: inline; }
.card summary::after { content: " ▸"; color: var(--muted); }
.card details[open] summary::after { content: " ▾"; }
.trend-row { display: grid; grid-template-columns: minmax(0, 1fr) 90px 34px; gap: 8px; align-items: center; padding: 4px 0; background: none; border: 0; width: 100%; text-align: left; cursor: pointer; font-size: .85rem; }
.trend-row:hover .tn { color: var(--accent); }
.trend-row .tn { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.trend-row svg { width: 90px; height: 10px; display: block; }
.trend-row svg rect.bg { fill: var(--surface-2); }
.trend-row svg rect.fg { fill: var(--c); }
.trend-row .tv { font-variant-numeric: tabular-nums; text-align: right; font-size: .78rem; color: var(--muted); }
.up { color: var(--ok); }
.down { color: var(--bad); }
.radar-list { display: flex; flex-wrap: wrap; gap: 6px; }
.radar-list button { border: 1px dashed var(--border); background: var(--surface-2); border-radius: 999px; padding: 3px 10px; font-size: .8rem; cursor: pointer; }
.radar-list button:hover { border-color: var(--accent); }
.radar-list .n { color: var(--muted); font-size: .72rem; margin-left: 4px; }
.src-row { display: flex; justify-content: space-between; gap: 8px; font-size: .8rem; padding: 3px 0; border-bottom: 1px solid var(--border); }
.src-row .ok { color: var(--ok); }
.src-row .err { color: var(--bad); }

.footer { max-width: 1320px; margin: 0 auto; padding: 20px 16px 40px; color: var(--muted); font-size: .8rem; border-top: 1px solid var(--border); }

/* ---------- responsive ---------- */
@media (max-width: 1000px) {
  .news-layout { grid-template-columns: minmax(0, 1fr); }
  .news-side { position: static; }
}
@media (max-width: 760px) {
  .brand-sub { display: none; }
  .status { order: 3; flex-basis: 100%; }
  .top-actions { flex: 1; justify-content: flex-end; }
  .search input { width: 100%; }
  .search { flex: 1; }
  .drawer { padding: 16px 16px 40px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}

/* ---------- footer ---------- */
.footer a { color: var(--muted); }
.footer .foot-tag { color: var(--text); }
.eyebrow { text-transform: uppercase; letter-spacing: .12em; font-size: .74rem; font-weight: 700; color: var(--accent); margin: 0 0 6px; }

/* news feed intro (the page at /news/) */
.news-intro { padding-bottom: 0; }
.news-intro h1 { font-size: clamp(1.6rem, 3.6vw, 2.4rem); margin: 4px 0 10px; max-width: 26ch; }
.news-intro p { max-width: 70ch; margin: 0 0 8px; }