/* Cambridge AI4S design system v2: technical, scientific, formal.
   Brand colours come from the logo (forest teal #153C3B, vivid teal #007F78). Every colour below is a token. */

@font-face { font-family: "IBM Plex Sans"; src: url("/fonts/plex-sans-latin.woff2") format("woff2"); font-weight: 100 700; font-style: normal; font-display: swap;
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; }
@font-face { font-family: "IBM Plex Sans"; src: url("/fonts/plex-sans-latin-ext.woff2") format("woff2"); font-weight: 100 700; font-style: normal; font-display: swap;
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF; }
@font-face { font-family: "IBM Plex Sans"; src: url("/fonts/plex-sans-latin-italic.woff2") format("woff2"); font-weight: 100 700; font-style: italic; font-display: swap; }
@font-face { font-family: "IBM Plex Mono"; src: url("/fonts/plex-mono-latin-400.woff2") format("woff2"); font-weight: 400; font-style: normal; font-display: swap; }
@font-face { font-family: "IBM Plex Mono"; src: url("/fonts/plex-mono-latin-500.woff2") format("woff2"); font-weight: 500 700; font-style: normal; font-display: swap; }

@view-transition { navigation: auto; }

:root {
  --bg: #F4F7F6;
  --surface: #FFFFFF;
  --surface-2: #EDF2F1;
  --sunk: #E8EEED;
  --ink: #0E2B29;
  --ink-2: #37524F;
  --ink-3: #5B726F;
  --line: #D6E0DE;
  --line-2: #BCCBC8;
  --grid: rgba(21, 60, 59, .065);
  --accent: #007F78;
  --accent-ink: #006F69;
  --accent-tint: #DDEFEC;
  --accent-glow: rgba(0, 127, 120, .16);
  --btn-bg: #153C3B;
  --btn-ink: #FFFFFF;
  --btn-hover: #0C2B2A;
  --feature-bg: #0E2B29;
  --feature-ink: #E8F3F1;
  --feature-ink-2: #A9C4BF;
  --feature-accent: #5FD8CB;
  --logo-ink: #153C3B;
  --logo-accent: #007F78;
  --prod: #17795A; --prod-tint: #DFF1E8;
  --demo: #9A5F08; --demo-tint: #F6ECDA;
  --prom: #5A4FB0; --prom-tint: #ECEAF8;
  --ours: #007F78; --cam: #37524F; --due: #B06A05;
  --shadow: 0 1px 2px rgba(14, 43, 41, .05), 0 14px 34px -18px rgba(14, 43, 41, .22);
  --radius: 8px;
  --radius-lg: 12px;
  --wrap: 1200px;
  --gutter: clamp(16px, 4vw, 40px);
  --header-h: 68px;
  --sans: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --fs-label: .72rem;
  --fs-xs: .82rem;
  --fs-sm: .9rem;
  --fs-md: .96rem;
  --fs-lead: 1.12rem;
  --fs-h4: 1.06rem;
  --fs-h3: 1.2rem;
  --ease: cubic-bezier(.2, .7, .2, 1);
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #051110; --surface: #0A1C1A; --surface-2: #0F2624; --sunk: #071614;
    --ink: #E2EEEC; --ink-2: #A6BDB9; --ink-3: #809893;
    --line: #17312E; --line-2: #24443F; --grid: rgba(120, 220, 205, .05);
    --accent: #2EC4B6; --accent-ink: #4FD1C5; --accent-tint: #0D2E2B; --accent-glow: rgba(46, 196, 182, .22);
    --btn-bg: #2EC4B6; --btn-ink: #03201D; --btn-hover: #4FD6C9;
    --feature-bg: #0C2725; --feature-ink: #E8F3F1; --feature-ink-2: #A9C4BF; --feature-accent: #5FD8CB;
    --logo-ink: #E2EEEC; --logo-accent: #2EC4B6;
    --prod: #5ED3A0; --prod-tint: #10291D; --demo: #F0B25A; --demo-tint: #2E2210; --prom: #A89CFF; --prom-tint: #1F1C3A;
    --ours: #2EC4B6; --cam: #A6BDB9; --due: #F0B25A;
    --shadow: 0 1px 2px rgba(0, 0, 0, .35), 0 16px 40px -20px rgba(0, 0, 0, .8);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #051110; --surface: #0A1C1A; --surface-2: #0F2624; --sunk: #071614;
  --ink: #E2EEEC; --ink-2: #A6BDB9; --ink-3: #809893;
  --line: #17312E; --line-2: #24443F; --grid: rgba(120, 220, 205, .05);
  --accent: #2EC4B6; --accent-ink: #4FD1C5; --accent-tint: #0D2E2B; --accent-glow: rgba(46, 196, 182, .22);
  --btn-bg: #2EC4B6; --btn-ink: #03201D; --btn-hover: #4FD6C9;
  --feature-bg: #0C2725; --feature-ink: #E8F3F1; --feature-ink-2: #A9C4BF; --feature-accent: #5FD8CB;
  --logo-ink: #E2EEEC; --logo-accent: #2EC4B6;
  --prod: #5ED3A0; --prod-tint: #10291D; --demo: #F0B25A; --demo-tint: #2E2210; --prom: #A89CFF; --prom-tint: #1F1C3A;
  --ours: #2EC4B6; --cam: #A6BDB9; --due: #F0B25A;
  --shadow: 0 1px 2px rgba(0, 0, 0, .35), 0 16px 40px -20px rgba(0, 0, 0, .8);
  color-scheme: dark;
}

.tier-prod { --tier: var(--prod); --tier-tint: var(--prod-tint); }
.tier-demo { --tier: var(--demo); --tier-tint: var(--demo-tint); }
.tier-prom { --tier: var(--prom); --tier-tint: var(--prom-tint); }

/* ---------- base ---------- */
*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; scroll-padding-top: 24px; }
@media (min-width: 760px) { html { scroll-padding-top: calc(var(--header-h) + 24px); } }
@media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } }
body { margin: 0; background: var(--bg); color: var(--ink); font: 400 1.0625rem/1.6 var(--sans); -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; font-feature-settings: "kern", "ss02"; }
main { display: block; }
main:focus { outline: none; }
svg { display: block; flex: none; }
a { color: var(--accent-ink); text-decoration-thickness: 1px; text-underline-offset: .2em; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }
h1, h2, h3, h4 { font-family: var(--sans); font-weight: 600; line-height: 1.15; letter-spacing: -.015em; margin: 0; color: var(--ink); text-wrap: balance; }
p { margin: 0; text-wrap: pretty; }
ul, ol { margin: 0; padding: 0; list-style: none; }
button { font: inherit; color: inherit; }
time, .num { font-variant-numeric: tabular-nums; }
::selection { background: var(--accent); color: #fff; }

.wrap { width: 100%; max-width: calc(var(--wrap) + 2 * var(--gutter)); margin-inline: auto; padding-left: max(var(--gutter), env(safe-area-inset-left)); padding-right: max(var(--gutter), env(safe-area-inset-right)); }
.sr-only { position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
html:not(.js) .js-only { display: none !important; }
.i { width: 1.1em; height: 1.1em; }
.muted { color: var(--ink-3); }
.dot { color: var(--ink-3); }
.skip { position: absolute; left: 12px; top: -60px; z-index: 100; padding: 10px 16px; border-radius: var(--radius); background: var(--btn-bg); color: var(--btn-ink); font-weight: 600; text-decoration: none; }
.skip:focus { top: 12px; }

/* blueprint grid, faded out from the top of a section */
.gridbg { position: relative; isolation: isolate; }
.gridbg::before { content: ""; position: absolute; inset: 0; z-index: -1; pointer-events: none;
  background-image: linear-gradient(var(--grid) 1px, transparent 1px), linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 44px 44px; background-position: -1px -1px;
  -webkit-mask-image: radial-gradient(120% 90% at 50% 0%, #000 30%, transparent 75%); mask-image: radial-gradient(120% 90% at 50% 0%, #000 30%, transparent 75%); }

/* labels, indices and status */
.index { display: flex; align-items: center; gap: 12px; margin-bottom: 18px; font: 500 var(--fs-label)/1.3 var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--ink-3); }
.index-n { padding: 3px 7px; border: 1px solid var(--line-2); border-radius: 4px; color: var(--accent-ink); letter-spacing: .08em; }
.index::after { content: ""; flex: 1; min-width: 24px; height: 1px; background: linear-gradient(90deg, var(--line-2), transparent); }
.h-sub { margin-bottom: 14px; font: 500 var(--fs-label)/1.3 var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--ink-3); }
.badge { display: inline-block; padding: 1px 7px; border: 1px solid var(--accent); border-radius: 4px; color: var(--accent-ink); font: 500 .66rem/1.7 var(--mono); letter-spacing: .1em; text-transform: uppercase; vertical-align: .15em; white-space: nowrap; }
.status { display: inline-flex; align-items: center; gap: 9px; padding: 5px 11px 5px 9px; border: 1px solid var(--line-2); border-radius: 999px; background: var(--surface); font: 500 var(--fs-xs)/1.3 var(--mono); color: var(--ink-2); }
.status time { color: var(--ink); }
.pulse { position: relative; width: 8px; height: 8px; border-radius: 50%; background: var(--accent); }
.pulse::after { content: ""; position: absolute; inset: -4px; border-radius: 50%; border: 1px solid var(--accent); opacity: 0; }
.motion .pulse::after { animation: pulse 2.4s var(--ease) infinite; }
.status-stale .pulse { background: var(--due); }
.status-stale .pulse::after { border-color: var(--due); }
.status-wait .pulse { background: var(--ink-3); }
.note { margin-top: 22px; font-size: var(--fs-sm); color: var(--ink-3); max-width: 64em; }
.checked { margin-top: 18px; font: 400 var(--fs-xs)/1.5 var(--mono); color: var(--ink-3); }

/* ---------- buttons, chips, tags ---------- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 10px; padding: 12px 20px; border-radius: 6px; border: 1px solid transparent; font: 600 .95rem/1.1 var(--sans); letter-spacing: .005em; text-decoration: none; cursor: pointer; transition: background-color .2s, border-color .2s, color .2s, box-shadow .2s, transform .2s var(--ease); }
.btn .i { width: 18px; height: 18px; transition: transform .2s var(--ease); }
.btn:hover .i { transform: translateX(3px); }
.btn-primary { background: var(--btn-bg); color: var(--btn-ink); }
.btn-primary:hover { background: var(--btn-hover); box-shadow: 0 0 0 4px var(--accent-glow); }
.btn-ghost { border-color: var(--line-2); color: var(--ink); background: color-mix(in srgb, var(--surface) 60%, transparent); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent-ink); }
.btn-sm { padding: 9px 15px; font-size: .88rem; }
.btn-text { display: inline-flex; align-items: center; gap: 6px; padding: 8px 10px; border: 0; border-radius: 6px; background: none; color: var(--accent-ink); font: 500 var(--fs-sm) var(--sans); cursor: pointer; white-space: nowrap; }
.btn-text:hover { background: var(--surface-2); }
.btn-text .i { width: 17px; height: 17px; }
.icon-btn { display: inline-grid; place-items: center; width: 38px; height: 38px; border-radius: 6px; border: 1px solid var(--line); background: transparent; color: var(--ink-2); cursor: pointer; transition: color .2s, border-color .2s; }
.icon-btn:hover { color: var(--accent-ink); border-color: var(--accent); }
.icon-btn .i { width: 18px; height: 18px; }
.theme-toggle .i-sun { display: none; }
:root[data-theme="dark"] .theme-toggle .i-sun { display: block; }
:root[data-theme="dark"] .theme-toggle .i-moon { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .i-sun { display: block; }
  :root:not([data-theme="light"]) .theme-toggle .i-moon { display: none; }
}

.chips { display: flex; gap: 6px; overflow-x: auto; scrollbar-width: none; }
.chips::-webkit-scrollbar { display: none; }
.chip { flex: none; display: inline-flex; align-items: center; gap: 7px; padding: 6px 12px; border: 1px solid var(--line-2); border-radius: 6px; background: var(--surface); color: var(--ink-2); font: 500 var(--fs-sm)/1.2 var(--sans); cursor: pointer; transition: background-color .2s, color .2s, border-color .2s; }
.chip:hover { border-color: var(--accent); color: var(--ink); }
.chip:focus-visible { outline-offset: -2px; }
.chip .n { font: 400 var(--fs-xs) var(--mono); color: var(--ink-3); }
.chip[aria-pressed="true"] { background: var(--ink); border-color: var(--ink); color: var(--bg); }
.chip[aria-pressed="true"] .n { color: inherit; opacity: .7; }
.tag, .trk, .etag { display: inline-flex; align-items: center; padding: 1px 7px; border: 1px solid var(--line-2); border-radius: 4px; font: 500 .7rem/1.6 var(--mono); letter-spacing: .04em; color: var(--ink-2); white-space: nowrap; }
.trk-cam { border-color: var(--accent); color: var(--accent-ink); }
.etag-ours { border-color: var(--ours); color: var(--accent-ink); background: var(--accent-tint); }
.etag-deadline { border-color: var(--due); color: var(--due); }
.etag-first { border-color: var(--prod); color: var(--prod); }
.ev { display: inline-flex; align-items: center; gap: 5px; padding: 1px 7px 1px 6px; border-radius: 4px; font: 500 .7rem/1.6 var(--mono); letter-spacing: .04em; white-space: nowrap; background: var(--surface-2); color: var(--ink-2); }
.ev::before { content: ""; width: 6px; height: 6px; border-radius: 1px; background: currentColor; }
.ev-paper { color: var(--prod); background: var(--prod-tint); }
.ev-preprint { color: var(--prom); background: var(--prom-tint); }
.ev-announcement { color: var(--demo); background: var(--demo-tint); }
.ev-news, .ev-analysis, .ev-university { color: var(--ink-2); }
.rank { font: 500 var(--fs-xs)/1 var(--mono); color: var(--accent-ink); }

/* ---------- header ---------- */
.announce { background: var(--feature-bg); color: var(--feature-ink); font-size: var(--fs-sm); }
.announce p { padding-block: 9px; text-align: center; }
.announce a { color: var(--feature-accent); font-weight: 600; }
.site-header { position: relative; z-index: 30; border-bottom: 1px solid var(--line); background: var(--bg); view-transition-name: site-header; }
@media (min-width: 760px) {
  .site-header { position: sticky; top: 0; background: color-mix(in srgb, var(--bg) 84%, transparent); -webkit-backdrop-filter: saturate(1.6) blur(14px); backdrop-filter: saturate(1.6) blur(14px); }
}
.header-row { display: flex; align-items: center; gap: 24px; min-height: var(--header-h); }
.brand { display: inline-flex; align-items: center; gap: 12px; color: var(--ink); text-decoration: none; flex: none; }
.brand .logo-emblem { height: 38px; width: auto; }
.brand .logo-word { height: 34px; width: auto; }
.lg-ink { fill: var(--logo-ink); }
.lg-acc { fill: var(--logo-accent); }
.site-nav ul { display: flex; gap: 2px; }
.site-nav a { position: relative; display: block; padding: 8px 12px; border-radius: 6px; color: var(--ink-2); font-size: .94rem; font-weight: 500; text-decoration: none; white-space: nowrap; transition: color .2s, background-color .2s; }
.site-nav a::after { content: ""; position: absolute; left: 12px; right: 12px; bottom: 3px; height: 2px; border-radius: 2px; background: var(--accent); transform: scaleX(0); transform-origin: left; transition: transform .3s var(--ease); }
.site-nav a:hover { color: var(--ink); }
.site-nav a:hover::after, .site-nav a[aria-current="page"]::after { transform: scaleX(1); }
.site-nav a[aria-current="page"] { color: var(--ink); }
.site-nav a:focus-visible { outline-offset: -2px; }
.header-actions { margin-left: auto; display: flex; align-items: center; gap: 8px; }
@media (max-width: 899px) {
  .header-row { flex-wrap: wrap; gap: 4px 12px; padding-block: 10px 2px; min-height: 0; }
  .brand .logo-emblem { height: 32px; }
  .brand .logo-word { height: 29px; }
  .site-nav { order: 3; margin-inline: -12px; width: calc(100% + 24px); overflow-x: auto; scrollbar-width: none; }
  .site-nav::-webkit-scrollbar { display: none; }
  .site-nav a { padding: 10px 12px; font-size: .92rem; }
}

/* ---------- sections ---------- */
.section { padding-block: clamp(56px, 8vw, 104px); border-top: 1px solid var(--line); }
.sec-head { max-width: 860px; margin-bottom: clamp(26px, 4vw, 42px); }
.sec-title { display: flex; align-items: flex-end; justify-content: space-between; gap: 18px 28px; flex-wrap: wrap; }
.sec-head h2 { font-size: clamp(1.65rem, 3.1vw, 2.35rem); letter-spacing: -.025em; max-width: 24em; }
.sec-intro { margin-top: 12px; font-size: var(--fs-lead); color: var(--ink-2); max-width: 42em; }
.sec-link { display: inline-flex; align-items: center; gap: 8px; padding-bottom: 4px; color: var(--accent-ink); font-weight: 600; font-size: var(--fs-sm); text-decoration: none; white-space: nowrap; }
.sec-link .i { width: 17px; height: 17px; transition: transform .2s var(--ease); }
.sec-link:hover .i { transform: translateX(3px); }
.section > .wrap > .sec-head:has(.sec-link) { max-width: none; }
.page-head { padding-block: clamp(44px, 7vw, 88px) clamp(36px, 5vw, 60px); }
.page-head h1 { max-width: 20em; font-size: clamp(2.1rem, 4.6vw, 3.5rem); font-weight: 600; line-height: 1.05; letter-spacing: -.035em; }
.page-head .lede { margin-top: 20px; max-width: 44em; font-size: clamp(1.04rem, 1.4vw, 1.16rem); color: var(--ink-2); }
.head-status { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 16px; margin-top: 22px; }
.head-count { font: 400 var(--fs-xs) var(--mono); color: var(--ink-3); }
.page-head .hero-cta { margin-top: 26px; }
.jump { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 26px; }
.jump a { padding: 6px 12px; border: 1px solid var(--line-2); border-radius: 6px; color: var(--ink-2); font-size: var(--fs-sm); text-decoration: none; background: color-mix(in srgb, var(--surface) 60%, transparent); transition: border-color .2s, color .2s; }
.jump a:hover { border-color: var(--accent); color: var(--ink); }
.nf { min-height: 52vh; }

.empty { border: 1px dashed var(--line-2); border-radius: var(--radius); padding: 22px 24px; color: var(--ink-2); background: color-mix(in srgb, var(--surface) 50%, transparent); }
.empty-title { font-weight: 600; color: var(--ink); margin-bottom: 4px; }
.callouts { display: grid; gap: 10px; margin-top: 24px; }
.callout { display: flex; gap: 12px; align-items: flex-start; padding: 14px 16px; border-left: 2px solid var(--line-2); border-radius: 0 var(--radius) var(--radius) 0; background: var(--surface-2); color: var(--ink-2); font-size: var(--fs-md); }
.callout strong { color: var(--ink); }
.callout .i { width: 20px; height: 20px; margin-top: 2px; color: var(--accent-ink); }
.callout-closed { border-left-color: var(--due); }
.callout-new, .callout-novice { border-left-color: var(--accent); }
.callout-novice { margin-top: 24px; }

/* ruled, numbered columns: the house layout for short parallel ideas */
.ruled { display: grid; gap: 0 32px; }
.ruled-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.ruled-1 { grid-template-columns: 1fr; }
@media (max-width: 899px) { .ruled-3 { grid-template-columns: 1fr; } }
.ruled > li { position: relative; padding: 20px 0 26px; border-top: 1px solid var(--line-2); }
.ruled > li::before { content: ""; position: absolute; left: 0; top: -1px; width: 36px; height: 2px; background: var(--accent); }
.ruled-n { font: 500 var(--fs-label)/1.3 var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--accent-ink); }
.ruled h3 { margin-top: 10px; font-size: var(--fs-h3); }
.ruled p:not(.ruled-n) { margin-top: 8px; color: var(--ink-2); font-size: var(--fs-md); }
.ruled .ruled-foot { margin-top: 14px; padding-top: 12px; border-top: 1px dashed var(--line); color: var(--ink-3); font-size: var(--fs-sm); }

.steps { counter-reset: step; display: grid; gap: 14px; }
.steps li { counter-increment: step; position: relative; padding-left: 40px; color: var(--ink-2); }
.steps li::before { content: counter(step, decimal-leading-zero); position: absolute; left: 0; top: 1px; font: 500 var(--fs-xs)/1.6 var(--mono); color: var(--accent-ink); }
.more-link { margin-top: 16px; font-size: var(--fs-md); }
.two-col { display: grid; grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr); gap: clamp(24px, 5vw, 72px); align-items: start; }
@media (max-width: 859px) { .two-col { grid-template-columns: 1fr; } }
.two-col .sec-head { margin-bottom: 0; }

/* ---------- hero ---------- */
.hero { padding-block: clamp(40px, 7vw, 84px) 0; overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr); gap: clamp(28px, 4vw, 56px); align-items: center; }
@media (max-width: 979px) { .hero-grid { grid-template-columns: 1fr; } }
.hero h1 { font-size: clamp(2.6rem, 6.4vw, 4.9rem); font-weight: 600; line-height: .98; letter-spacing: -.045em; }
.hero h1 .hl { color: var(--accent); }
.hero-lede { margin-top: 24px; max-width: 34em; font-size: clamp(1.04rem, 1.5vw, 1.18rem); color: var(--ink-2); }
.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.hero-stats { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); margin: 36px 0 0; border-top: 1px solid var(--line-2); max-width: 560px; }
.hero-stats div { padding: 14px 14px 0 0; }
.hero-stats div + div { padding-left: 14px; border-left: 1px solid var(--line); }
.hero-stats dt { order: 2; font: 400 var(--fs-label)/1.4 var(--mono); letter-spacing: .06em; text-transform: uppercase; color: var(--ink-3); }
.hero-stats dd { margin: 0 0 4px; font: 500 clamp(1.7rem, 3vw, 2.3rem)/1 var(--mono); letter-spacing: -.03em; color: var(--ink); font-variant-numeric: tabular-nums; }
.hero-stats div { display: flex; flex-direction: column-reverse; }
.hero-visual { position: relative; aspect-ratio: 1.05 / 1; min-height: 300px; border: 1px solid var(--line); border-radius: var(--radius-lg); background: radial-gradient(80% 70% at 60% 40%, var(--accent-glow), transparent 70%), var(--surface); overflow: hidden; }
.hero-visual::before { content: ""; position: absolute; inset: 0; background-image: linear-gradient(var(--grid) 1px, transparent 1px), linear-gradient(90deg, var(--grid) 1px, transparent 1px); background-size: 22px 22px; }
.graph { position: absolute; inset: 0; width: 100%; height: 100%; }
.hero-caption { position: absolute; left: 14px; right: 14px; bottom: 12px; font: 400 .7rem/1.4 var(--mono); color: var(--ink-3); }
.hero-caption span { color: var(--accent-ink); margin-right: 6px; text-transform: uppercase; letter-spacing: .1em; }
.hero-visual::after { content: ""; position: absolute; inset: 10px; border: 1px dashed var(--line); border-radius: 6px; pointer-events: none; }
.hero-status { padding-block: 28px clamp(40px, 6vw, 64px); }
@media (max-width: 979px) { .hero-visual { aspect-ratio: 16 / 10; } }

/* ---------- stories ---------- */
.brief-grid { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); gap: clamp(20px, 3vw, 40px); align-items: start; }
@media (max-width: 899px) { .brief-grid { grid-template-columns: 1fr; } }
.story-lead { position: relative; padding: clamp(20px, 2.6vw, 28px); border: 1px solid var(--line); border-radius: var(--radius-lg); background: var(--surface); box-shadow: var(--shadow); overflow: hidden; }
.story-lead::before { content: ""; position: absolute; inset: 0 0 auto 0; height: 2px; background: linear-gradient(90deg, var(--accent), transparent); }
.sl-top { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.sl-top .rank { margin-right: 4px; font-size: .95rem; }
.sl-title { margin-top: 14px; font-size: clamp(1.3rem, 2.2vw, 1.7rem); letter-spacing: -.02em; line-height: 1.2; }
.sl-title a, .srow-title a { color: var(--ink); text-decoration: none; background-image: linear-gradient(var(--accent), var(--accent)); background-size: 0 1px; background-repeat: no-repeat; background-position: 0 100%; transition: background-size .35s var(--ease), color .2s; }
.sl-title a:hover, .srow-title a:hover { background-size: 100% 1px; color: var(--accent-ink); }
.sl-snippet { margin-top: 12px; color: var(--ink-2); }
.s-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 10px; margin-top: 12px; font: 400 var(--fs-xs)/1.4 var(--mono); color: var(--ink-3); }
.s-meta .src { color: var(--ink-2); font-weight: 500; }
.also-n { padding: 0 6px; border-radius: 4px; background: var(--accent-tint); color: var(--accent-ink); }
.why { margin-top: 16px; padding-top: 12px; border-top: 1px dashed var(--line); font-size: var(--fs-sm); color: var(--ink-2); }
.why span { margin-right: 10px; font: 500 var(--fs-label) var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--accent-ink); }
.also { margin-top: 8px; font-size: var(--fs-xs); color: var(--ink-3); }
.also a { color: var(--ink-2); }
.srows { display: grid; }
.srow { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 14px; padding: 16px 0; border-top: 1px solid var(--line); }
.srow:first-child { border-top: 0; padding-top: 4px; }
.srow > .rank { padding-top: 4px; }
.srow-main { grid-column: 2; }
.srow:not(:has(> .rank)) .srow-main { grid-column: 1 / -1; }
.srow-title { font-size: var(--fs-h4); line-height: 1.3; }
.srow-snippet { margin-top: 6px; font-size: var(--fs-sm); color: var(--ink-2); }
.srow .s-meta { margin-top: 8px; }
.srows-tight .srow { padding: 12px 0; }
.srows-tight .srow-title { font-size: .98rem; font-weight: 500; }
.srows-2col { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 36px; }
.srows-2col .srow:nth-child(2) { border-top: 0; padding-top: 4px; }
@media (max-width: 759px) { .srows-2col { grid-template-columns: 1fr; } .srows-2col .srow:nth-child(2) { border-top: 1px solid var(--line); padding-top: 16px; } }

.track-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
@media (max-width: 999px) { .track-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 639px) { .track-grid { grid-template-columns: 1fr; } }
.track-block, .col-block { padding: 18px 18px 6px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.tb-title { display: flex; align-items: center; gap: 10px; padding-bottom: 10px; margin-bottom: 2px; border-bottom: 1px solid var(--line-2); font-size: var(--fs-md); }
.tb-title .n { margin-left: auto; font: 400 var(--fs-xs) var(--mono); color: var(--ink-3); }
.tb-code { padding: 1px 6px; border-radius: 4px; background: var(--accent-tint); color: var(--accent-ink); font: 500 .68rem/1.6 var(--mono); letter-spacing: .08em; }
.tb-empty { padding: 14px 0 12px; font-size: var(--fs-sm); }
.col-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.col-grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
@media (max-width: 899px) { .col-grid, .col-grid-2 { grid-template-columns: 1fr; } }
.method { display: grid; gap: 28px; }
.legend { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px 24px; margin: 0; }
.legend div { display: flex; align-items: baseline; gap: 10px; }
.legend dt { flex: none; width: 118px; }
.legend dd { margin: 0; font-size: var(--fs-sm); color: var(--ink-2); }
@media (max-width: 599px) { .legend { grid-template-columns: 1fr; } }
.sources-box { border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.sources-box summary { display: flex; justify-content: space-between; gap: 12px; padding: 14px 16px; cursor: pointer; font-weight: 600; font-size: var(--fs-md); }
.sources-box summary .n { font: 400 var(--fs-xs) var(--mono); color: var(--ink-3); }
.sources-box ul { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 24px; padding: 0 16px 14px; }
.sources-box li { display: flex; justify-content: space-between; gap: 12px; padding: 7px 0; border-top: 1px solid var(--line); font-size: var(--fs-sm); }
.sources-box li span:last-child { font: 400 var(--fs-xs) var(--mono); color: var(--ink-3); }
.sources-box li.down span:last-child { color: var(--due); }
@media (max-width: 599px) { .sources-box ul { grid-template-columns: 1fr; } }

/* ---------- events ---------- */
.week-grid { display: grid; grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr); gap: clamp(20px, 3vw, 40px); align-items: start; }
@media (max-width: 899px) { .week-grid { grid-template-columns: 1fr; } }
.pick { position: relative; padding: 24px; border-radius: var(--radius-lg); background: var(--feature-bg); color: var(--feature-ink); overflow: hidden; }
.pick::after { content: ""; position: absolute; right: -60px; top: -60px; width: 180px; height: 180px; border-radius: 50%; background: radial-gradient(circle, var(--accent-glow), transparent 70%); }
.pick-label { font: 500 var(--fs-label)/1.3 var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--feature-accent); }
.pick h3 { margin-top: 14px; font-size: 1.3rem; color: var(--feature-ink); }
.pick h3 a { color: inherit; text-decoration: none; }
.pick h3 a:hover { text-decoration: underline; text-decoration-color: var(--feature-accent); }
.pick p { display: flex; align-items: center; gap: 8px; margin-top: 10px; font-size: var(--fs-sm); color: var(--feature-ink-2); }
.pick .i { width: 16px; height: 16px; color: var(--feature-accent); }
.pick-why { padding-top: 12px; margin-top: 16px !important; border-top: 1px solid rgba(255, 255, 255, .12); font-size: var(--fs-xs) !important; }
.erows { display: grid; }
.erow { display: grid; grid-template-columns: 112px minmax(0, 1fr) auto; gap: 16px; padding: 14px 0; border-top: 1px solid var(--line); align-items: start; }
.erows > .erow:first-child { border-top: 0; }
.erow-when { display: flex; flex-direction: column; gap: 2px; font-family: var(--mono); }
.erow-date { font-size: var(--fs-sm); font-weight: 500; color: var(--ink); }
.erow-time { font-size: var(--fs-xs); color: var(--ink-3); }
.erow-title { font-size: var(--fs-h4); line-height: 1.3; }
.erow-title a { color: var(--ink); text-decoration-color: var(--line-2); }
.erow-title a:hover { color: var(--accent-ink); text-decoration-color: currentColor; }
.erow-who { margin-top: 3px; font-size: var(--fs-sm); color: var(--ink-2); }
.erow-title .tbc { font-weight: 400; color: var(--ink-3); }
.erow-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 8px; margin-top: 8px; font-size: var(--fs-xs); color: var(--ink-3); }
.erow-venue { display: inline-flex; align-items: center; gap: 4px; }
.erow-venue .i { width: 14px; height: 14px; }
.erow-series a { color: var(--ink-3); }
.erow-abs { margin-top: 8px; font-size: var(--fs-sm); }
.erow-abs summary { cursor: pointer; color: var(--accent-ink); font-size: var(--fs-xs); font-family: var(--mono); }
.erow-abs p { margin-top: 6px; color: var(--ink-2); max-width: 62em; }
.erow-add { display: inline-flex; align-items: center; gap: 6px; padding: 6px 9px; border: 1px solid var(--line); border-radius: 6px; color: var(--ink-3); font: 500 var(--fs-xs) var(--mono); text-decoration: none; transition: color .2s, border-color .2s; }
.erow-add .i { width: 15px; height: 15px; }
.erow-add:hover { color: var(--accent-ink); border-color: var(--accent); }
.erow-ours .erow-title a, .erow-ours .erow-title { color: var(--accent-ink); }
.erow-deadline .erow-date { color: var(--due); }
@media (max-width: 639px) { .erow { grid-template-columns: 1fr auto; } .erow-when { grid-column: 1 / -1; flex-direction: row; gap: 10px; } .erow-main { grid-column: 1; } }

.programme { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 36px; }
@media (max-width: 759px) { .programme { grid-template-columns: 1fr; } }
.programme li { display: grid; grid-template-columns: 34px minmax(0, 1fr); gap: 12px; padding: 16px 0 18px; border-top: 1px solid var(--line); }
.prog-n { font: 500 var(--fs-xs)/1.9 var(--mono); color: var(--accent-ink); }
.prog-kind { font: 500 var(--fs-label)/1.6 var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); }
.programme h3 { margin-top: 4px; font-size: var(--fs-h4); line-height: 1.3; }
.programme p:not(.prog-n):not(.prog-kind) { margin-top: 4px; font-size: var(--fs-sm); color: var(--ink-2); }

.cal-wrap { display: grid; gap: 16px; }
.cal-months { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
@media (max-width: 859px) { .cal-months { grid-template-columns: 1fr; } }
.cal-month { padding: 16px; border: 1px solid var(--line); border-radius: var(--radius-lg); background: var(--surface); }
.cal-title { margin-bottom: 10px; font: 500 var(--fs-label)/1.4 var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--ink-2); }
.cal-grid { display: grid; grid-template-columns: repeat(7, minmax(0, 1fr)); gap: 4px; }
.cal-h { padding: 4px 0; text-align: center; font: 400 .66rem var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--ink-3); }
.cal-cell { position: relative; display: flex; flex-direction: column; align-items: center; justify-content: flex-start; gap: 4px; min-height: 46px; padding: 6px 2px; border-radius: 6px; border: 1px solid transparent; color: var(--ink-2); text-decoration: none; font: 400 var(--fs-xs) var(--mono); }
.cal-pad { visibility: hidden; }
.cal-cell.is-past { opacity: .4; }
.cal-cell.is-today { border-color: var(--accent); color: var(--ink); font-weight: 600; }
a.cal-cell { background: var(--surface-2); color: var(--ink); transition: background-color .2s, border-color .2s, transform .2s var(--ease); }
a.cal-cell:hover { border-color: var(--accent); transform: translateY(-1px); }
a.cal-cell[aria-current="date"] { background: var(--ink); color: var(--bg); }
.cal-dots { display: flex; gap: 3px; }
.cal-dots i, .cal-legend i { display: inline-block; width: 6px; height: 6px; border-radius: 50%; }
.dot-ours { background: var(--ours); }
.dot-cambridge { background: var(--cam); }
.dot-deadline { background: var(--due); border-radius: 1px !important; transform: rotate(45deg); }
.cal-n { position: absolute; top: 3px; right: 5px; font-size: .6rem; color: var(--ink-3); }
a.cal-cell[aria-current="date"] .cal-n { color: inherit; }
.cal-legend { display: flex; flex-wrap: wrap; gap: 8px 20px; font: 400 var(--fs-xs) var(--mono); color: var(--ink-3); }
.cal-legend span { display: inline-flex; align-items: center; gap: 7px; }

.ag-layout { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: clamp(28px, 4vw, 56px); align-items: start; }
@media (max-width: 979px) { .ag-layout { grid-template-columns: 1fr; } }
.ag-week { margin-top: 26px; }
.ag-week-title { display: flex; align-items: baseline; gap: 12px; padding-bottom: 10px; border-bottom: 2px solid var(--ink); font-size: var(--fs-md); }
.ag-week-title .n { margin-left: auto; font: 400 var(--fs-xs) var(--mono); color: var(--ink-3); }
.ag-day { scroll-margin-top: 150px; }
.ag-day-title { margin-top: 16px; font: 500 var(--fs-label)/1.6 var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--accent-ink); }
.ag-day .erows { border-top: 1px solid var(--line); margin-top: 6px; }
.ag-day .erows > .erow:first-child { border-top: 0; }
.ag-status { margin-top: 8px; font: 400 var(--fs-xs) var(--mono); color: var(--ink-3); }
.ag-empty { padding: 20px 0; color: var(--ink-2); }
.ag-side { position: sticky; top: calc(var(--header-h) + 20px); display: grid; gap: 8px; }
.ag-side .h-sub + .series { margin-bottom: 18px; }
.series li { padding: 10px 0; border-top: 1px solid var(--line); }
.series a { font-weight: 600; font-size: var(--fs-md); color: var(--ink); text-decoration-color: var(--line-2); }
.series a:hover { color: var(--accent-ink); }
.series p { margin-top: 2px; font: 400 var(--fs-xs) var(--mono); color: var(--ink-3); }
@media (max-width: 979px) { .ag-side { position: static; } }
.filterbar { position: sticky; top: 0; z-index: 20; border-block: 1px solid var(--line); background: var(--bg); }
@supports ((-webkit-backdrop-filter: blur(1px)) or (backdrop-filter: blur(1px))) {
  .filterbar { background: color-mix(in srgb, var(--bg) 86%, transparent); -webkit-backdrop-filter: saturate(1.6) blur(14px); backdrop-filter: saturate(1.6) blur(14px); }
}
@media (min-width: 760px) { .filterbar { top: var(--header-h); } }
.filterbar-row { display: flex; align-items: center; gap: 12px; }
.filterbar .chips { flex: 1; padding-block: 10px; }
.filterbar-inline { position: sticky; padding: 4px 0 6px; margin-bottom: 4px; }
.filterbar-inline .filterbar-row + .filterbar-row .chips { padding-top: 0; }
@media (max-width: 559px) { .filterbar [data-expand-all] { display: none; } }

/* ---------- home: lens and routes ---------- */
.lens { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
@media (max-width: 859px) { .lens { grid-template-columns: 1fr; } }
.lens a { display: flex; flex-direction: column; gap: 10px; height: 100%; padding: 20px; border: 1px solid var(--line); border-top: 3px solid var(--tier); border-radius: var(--radius); background: var(--surface); color: var(--ink); text-decoration: none; transition: border-color .2s, transform .25s var(--ease), box-shadow .25s; }
.lens a:hover { transform: translateY(-2px); box-shadow: var(--shadow); border-color: var(--tier); }
.lens-top { display: flex; align-items: center; gap: 10px; }
.lens-top .rung { width: 16px; height: 17px; }
.lens-name { font-weight: 600; font-size: var(--fs-h3); }
.lens-n { margin-left: auto; font: 500 1.4rem var(--mono); color: var(--tier); }
.lens-bar { color: var(--ink-2); font-size: var(--fs-md); }
.lens-ex { margin-top: auto; padding-top: 10px; border-top: 1px dashed var(--line); font: 400 var(--fs-xs)/1.5 var(--mono); color: var(--ink-3); }

.getin-grid { display: grid; grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr); gap: 18px; align-items: stretch; }
@media (max-width: 899px) { .getin-grid { grid-template-columns: 1fr; } }
.feature-card { position: relative; display: flex; flex-direction: column; padding: clamp(22px, 3vw, 30px); border-radius: var(--radius-lg); background: var(--feature-bg); color: var(--feature-ink); overflow: hidden; }
.feature-card::before { content: ""; position: absolute; inset: 0; background-image: linear-gradient(rgba(255, 255, 255, .04) 1px, transparent 1px), linear-gradient(90deg, rgba(255, 255, 255, .04) 1px, transparent 1px); background-size: 22px 22px; pointer-events: none; }
.fc-kicker { font: 500 var(--fs-label)/1.3 var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--feature-accent); }
.dl-date { margin-top: 18px; font: 500 clamp(1.8rem, 3.2vw, 2.4rem)/1.05 var(--mono); letter-spacing: -.03em; }
.dl-rel { min-height: 1.4em; margin-top: 6px; font: 500 var(--fs-sm) var(--mono); color: var(--feature-accent); }
.dl-what { margin-top: 14px; font-weight: 600; }
.dl-who { margin-top: 6px; color: var(--feature-ink-2); font-size: var(--fs-md); }
.fc-none { margin-top: 18px; color: var(--feature-ink-2); }
.fc-link { position: relative; margin-top: auto; padding-top: 24px; display: inline-flex; align-items: center; gap: 8px; color: var(--feature-accent); font-weight: 600; text-decoration: none; }
.fc-link .i { width: 18px; height: 18px; transition: transform .2s var(--ease); }
.fc-link:hover .i { transform: translateX(3px); }
.getin-links { display: grid; gap: 10px; }
.getin-link { display: flex; align-items: center; gap: 18px; height: 100%; padding: 16px 18px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); color: var(--ink); text-decoration: none; transition: border-color .2s, transform .25s var(--ease); }
.getin-link:hover { border-color: var(--accent); transform: translateX(3px); }
.getin-link > .i { width: 19px; height: 19px; margin-left: auto; color: var(--ink-3); transition: color .2s; }
.getin-link:hover > .i { color: var(--accent-ink); }
.gl-n { min-width: 2.4ch; font: 500 1.6rem/1 var(--mono); color: var(--accent-ink); }
.gl-text { display: flex; flex-direction: column; }
.gl-title { font-weight: 600; }
.gl-desc { font-size: var(--fs-sm); color: var(--ink-3); }

/* ---------- join ---------- */
.join-grid { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr); gap: clamp(32px, 6vw, 88px); align-items: start; }
@media (max-width: 859px) { .join-grid { grid-template-columns: 1fr; } }
.join-grid .sec-head { margin-bottom: 0; }
.join-intro { margin: 14px 0 24px; font-size: var(--fs-lead); color: var(--ink-2); max-width: 34em; }
.join-links { display: grid; gap: 10px; }
.join-link, .join-email { display: flex; align-items: center; gap: 16px; padding: 14px 16px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); color: var(--ink); text-decoration: none; transition: border-color .2s; }
.join-link:hover { border-color: var(--accent); }
.join-link > .i { width: 19px; height: 19px; margin-left: auto; color: var(--ink-3); }
.jl-icon { display: inline-grid; place-items: center; width: 40px; height: 40px; border-radius: 6px; background: var(--accent-tint); color: var(--accent-ink); }
.jl-icon .i { width: 20px; height: 20px; }
.jl-text { display: flex; flex-direction: column; min-width: 0; }
.jl-title { font-weight: 600; }
.jl-sub { font: 400 var(--fs-sm) var(--mono); color: var(--ink-3); overflow-wrap: anywhere; }
a.jl-sub { color: var(--accent-ink); }
.join-email .btn-text { margin-left: auto; }
.take-part { padding: 26px; border: 1px solid var(--line); border-radius: var(--radius-lg); background: var(--surface); }
.take-part h3 { font-size: var(--fs-h3); margin-bottom: 16px; }

/* ---------- ladder ---------- */
.tier-key { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; margin-top: 32px; }
@media (max-width: 859px) { .tier-key { grid-template-columns: 1fr; } }
.tier-key a { display: block; height: 100%; padding: 16px 18px; border: 1px solid var(--line); border-top: 3px solid var(--tier); border-radius: var(--radius); background: var(--surface); color: var(--ink); text-decoration: none; transition: transform .25s var(--ease), box-shadow .25s; }
.tier-key a:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.tk-name { display: flex; align-items: center; gap: 10px; font-weight: 600; font-size: var(--fs-h4); }
.tk-n { margin-left: auto; font: 500 1.2rem var(--mono); color: var(--tier); }
.tk-bar { display: block; margin-top: 6px; font-size: var(--fs-sm); color: var(--ink-2); }
.rung { width: 16px; height: 17px; color: var(--tier, var(--ink)); }
.rung .rail { fill: none; stroke: currentColor; stroke-width: 1.4; stroke-linecap: round; }
.rung .on { fill: currentColor; }
.rung .off { fill: none; stroke: currentColor; stroke-width: 1; stroke-opacity: .55; }
.tier { padding-block: clamp(36px, 5vw, 56px) 8px; }
.tier-head { display: grid; grid-template-columns: auto minmax(0, 1fr) auto; gap: 16px; align-items: end; padding-bottom: 16px; margin-bottom: 22px; border-bottom: 2px solid var(--tier); }
.tier-head > .rung { width: 28px; height: 30px; align-self: center; }
.tier-head h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); letter-spacing: -.025em; }
.tier-def { margin-top: 4px; max-width: 48em; color: var(--ink-2); }
.tier-count { font: 500 var(--fs-xs) var(--mono); color: var(--tier); white-space: nowrap; }
@media (max-width: 559px) { .tier-head { grid-template-columns: auto minmax(0, 1fr); } .tier-count { grid-column: 2; } }
.tier-empty { padding: 18px 0 8px; color: var(--ink-3); }
.claims { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 340px), 1fr)); gap: 14px; align-items: start; }
.claim { display: flex; flex-direction: column; padding: 18px 20px 2px; border: 1px solid var(--line); border-top: 3px solid var(--tier); border-radius: var(--radius); background: var(--surface); scroll-margin-top: 150px; transition: box-shadow .25s, border-color .25s; }
.claim:hover { box-shadow: var(--shadow); }
.claim:target { box-shadow: 0 0 0 2px var(--tier); }
.claim-top { order: -2; display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.claim-metric { order: -1; margin-top: 14px; font: 500 1rem/1.35 var(--mono); color: var(--tier); }
.claim-title { margin-top: 6px; font-size: var(--fs-h3); line-height: 1.25; }
.track { font: 500 var(--fs-label)/1.4 var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--ink-3); }
.claim-tier { display: inline-flex; align-items: center; gap: 7px; font: 500 var(--fs-label)/1.4 var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--tier); }
.claim-tier .rung { width: 13px; height: 14px; }
.claim-lede { margin-top: 8px; font-size: var(--fs-md); color: var(--ink-2); }
.claim-more { margin-top: 16px; border-top: 1px solid var(--line); }
.claim-more summary { display: flex; align-items: center; justify-content: space-between; padding: 12px 0 14px; list-style: none; cursor: pointer; color: var(--accent-ink); font-size: var(--fs-sm); font-weight: 500; }
.claim-more summary::-webkit-details-marker { display: none; }
.claim-more summary:hover span { text-decoration: underline; }
.claim-more summary:focus-visible { outline-offset: -2px; }
.claim-more .chev { width: 18px; height: 18px; transition: transform .3s var(--ease); }
.claim-more[open] .chev { transform: rotate(180deg); }
.claim-body { padding-bottom: 18px; }
.claim-body h4 { margin-top: 4px; font: 500 var(--fs-label)/1.4 var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--ink-3); }
.claim-body p { margin: 5px 0 14px; font-size: var(--fs-md); color: var(--ink-2); }
.claim-body .sources { margin-bottom: 0; }
.motion .claim-more[open] .claim-body { animation: rise .45s var(--ease) both; }

.sources { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; margin-top: 20px; font: 400 var(--fs-label) var(--mono); color: var(--ink-3); }
.sources > span { margin-right: 4px; letter-spacing: .12em; text-transform: uppercase; }
.cite { display: inline-grid; place-items: center; min-width: 26px; height: 22px; padding: 0 6px; border: 1px solid var(--line); border-radius: 4px; background: var(--surface-2); color: var(--ink-2); font: 500 var(--fs-label) var(--mono); text-decoration: none; transition: border-color .2s, color .2s; }
.cite:hover { border-color: var(--accent); color: var(--accent-ink); }
.cite-tip { position: absolute; z-index: 60; width: min(380px, calc(100vw - 32px)); padding: 12px 14px; border: 1px solid var(--line-2); border-radius: var(--radius); background: var(--surface); color: var(--ink); box-shadow: var(--shadow); font-size: var(--fs-sm); line-height: 1.45; }
.cite-tip b { color: var(--accent-ink); font-family: var(--mono); font-weight: 500; margin-right: 6px; }
.motion .cite-tip:not([hidden]) { animation: rise .2s var(--ease) both; }

.loop { margin: 30px 0 0; padding: clamp(18px, 3vw, 28px); border: 1px solid var(--line); border-radius: var(--radius-lg); background: var(--surface); }
.loop figcaption { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 4px 16px; }
.loop-title { font-weight: 600; font-size: var(--fs-h4); }
.loop-note { font: 400 var(--fs-xs)/1.6 var(--mono); color: var(--ink-3); }
.loop-rows { display: grid; gap: 14px; margin-top: 22px; }
.loop-row { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 18px; align-items: center; }
.loop-label { display: flex; flex-direction: column; font-size: var(--fs-md); font-weight: 500; }
.loop-range { font: 400 var(--fs-xs) var(--mono); color: var(--ink-3); }
.loop-track { position: relative; height: 10px; border-radius: 2px; background: repeating-linear-gradient(90deg, var(--surface-2) 0 calc(100% / 8.5 - 1px), var(--line) calc(100% / 8.5 - 1px) calc(100% / 8.5)); }
.loop-bar { position: absolute; top: 0; bottom: 0; border-radius: 2px; background: var(--accent); transform-origin: left; }
.motion .loop:not(.is-in) .loop-bar { transform: scaleX(0); }
.motion .loop.is-in .loop-bar { transition: transform 1s var(--ease) .2s; }
.lb-proof { left: 0; width: 21%; }
.lb-forecast { left: 58.1%; width: 11.7%; }
.lb-synth { left: 68%; width: 16.7%; }
.lb-trial { left: 88.2%; width: 11.8%; }
.loop-axis { position: relative; height: 22px; margin: 12px 0 0 238px; font: 400 var(--fs-label) var(--mono); color: var(--ink-3); }
.loop-axis span { position: absolute; top: 0; transform: translateX(-50%); white-space: nowrap; }
.loop-axis .t0 { left: 0; transform: none; }
.loop-axis .t1 { left: 20.9%; }
.loop-axis .t2 { left: 41.8%; }
.loop-axis .t3 { left: 58.1%; }
.loop-axis .t4 { left: 75.5%; }
.loop-axis .t5 { left: 88.2%; }
.loop-axis .t6 { left: 100%; transform: translateX(-100%); }
@media (max-width: 859px) { .loop-axis .t6 { display: none; } }
@media (max-width: 699px) {
  .loop-row { grid-template-columns: 1fr; gap: 6px; }
  .loop-axis { margin-left: 0; }
  .loop-axis .t1, .loop-axis .t2, .loop-axis .t4 { display: none; }
}

.refs { display: grid; max-width: 1000px; }
.ref { display: grid; grid-template-columns: 40px minmax(0, 1fr); gap: 8px; padding: 12px 0; border-top: 1px solid var(--line); font-size: var(--fs-sm); scroll-margin-top: 150px; }
.ref:target { background: var(--accent-tint); }
.ref-n { font: 500 var(--fs-xs)/1.6 var(--mono); color: var(--ink-3); }
.ref-cite { color: var(--ink); }
.ref-link { font: 400 var(--fs-xs) var(--mono); overflow-wrap: anywhere; }
.ref-in { margin-top: 4px; font-size: var(--fs-xs); color: var(--ink-3); }
.ref-in a { color: var(--ink-3); }
.ref-in a:hover { color: var(--accent-ink); }

/* ---------- routes in ---------- */
.timeline { border-top: 1px solid var(--line); }
.tl-item { display: grid; grid-template-columns: 210px minmax(0, 1fr); gap: 8px 28px; padding: 18px 16px; border-bottom: 1px solid var(--line); transition: background-color .3s; }
@media (max-width: 649px) { .tl-item { grid-template-columns: 1fr; } }
.tl-date time { display: block; font: 500 1rem var(--mono); }
.rel { white-space: nowrap; }
.tl-date .rel { display: block; margin-top: 2px; font: 500 var(--fs-xs) var(--mono); color: var(--accent-ink); }
.tl-what { font-weight: 600; }
.tl-who { margin-top: 4px; font-size: var(--fs-md); color: var(--ink-2); }
.tl-item.is-past, .tl-item.is-past .tl-what, .tl-item.is-past .tl-who, .tl-item.is-past .rel { color: var(--ink-3); }
.tl-item.is-past time { text-decoration: line-through; text-decoration-thickness: 1px; }
.tl-item.is-next { border-radius: var(--radius); background: var(--accent-tint); border-bottom-color: transparent; box-shadow: inset 2px 0 0 var(--accent); }

.tablist { position: relative; display: flex; gap: 2px; margin-bottom: 30px; border-bottom: 1px solid var(--line); overflow-x: auto; scrollbar-width: none; }
.tablist::-webkit-scrollbar { display: none; }
.tab { flex: none; margin-bottom: -1px; padding: 12px 16px; border: 0; background: none; color: var(--ink-2); font: 500 1rem var(--sans); cursor: pointer; transition: color .2s; }
.tab:hover, .tab[aria-selected="true"] { color: var(--ink); }
.tab:focus-visible { outline-offset: -2px; }
.tab .n { margin-left: 8px; font: 400 var(--fs-xs) var(--mono); color: var(--ink-3); }
.tab-ink { position: absolute; left: 0; bottom: 0; height: 2px; width: var(--w, 0); transform: translateX(var(--x, 0)); background: var(--accent); transition: transform .35s var(--ease), width .35s var(--ease); }
html:not(.js) .tab-ink { display: none; }
.panel + .panel { margin-top: 64px; }
.panel-title { margin-bottom: 10px; font-size: 1.5rem; }
.tabs-on .panel + .panel { margin-top: 0; }
.tabs-on .panel-title { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.motion .tabs-on .panel:not([hidden]) { animation: rise .4s var(--ease) both; }
.panel-intro { max-width: 46em; color: var(--ink-2); margin-bottom: 8px; }
.subject { margin-top: 28px; }
.subject h4 { margin-bottom: 4px; font: 500 var(--fs-label)/1.3 var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--ink-3); }
.module { display: grid; grid-template-columns: 64px minmax(0, 1fr) 150px; gap: 18px; align-items: baseline; padding: 14px 0; border-top: 1px solid var(--line); }
.module-code { font: 500 var(--fs-md) var(--mono); color: var(--ink); }
.module-name { font-weight: 600; }
.module-name a { color: var(--ink); text-decoration-color: var(--line-2); }
.module-name a:hover { color: var(--accent-ink); text-decoration-color: currentColor; }
.module-why { margin-top: 2px; font-size: var(--fs-md); color: var(--ink-2); }
.module-part { font: 400 var(--fs-xs) var(--mono); color: var(--ink-3); text-align: right; }
.module.is-flag .module-code { color: var(--accent-ink); }
@media (max-width: 639px) { .module { grid-template-columns: 52px minmax(0, 1fr); } .module-part { grid-column: 2; text-align: left; } }
.route-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 330px), 1fr)); gap: 14px; margin-top: 18px; }
.route-card { display: flex; flex-direction: column; padding: 20px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); transition: border-color .2s, transform .25s var(--ease); }
.route-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.rc-meta { font-size: var(--fs-sm); color: var(--ink-3); }
.route-card h4 { margin-top: 8px; font-size: var(--fs-h4); }
.route-card h4 a { color: var(--ink); text-decoration-color: var(--line-2); }
.route-card h4 a:hover { color: var(--accent-ink); text-decoration-color: currentColor; }
.rc-why { margin-top: 8px; font-size: var(--fs-md); color: var(--ink-2); }
.rc-due { margin-top: auto; padding-top: 16px; font: 500 var(--fs-sm) var(--mono); }
.rc-label { color: var(--ink-3); font-weight: 400; }
.rc-due .rel { color: var(--accent-ink); }
.route-card.is-past .rc-due time { text-decoration: line-through; color: var(--ink-3); }
.doc-list { border-top: 1px solid var(--line); margin-top: 18px; }
.doc { display: grid; grid-template-columns: minmax(0, 1fr) 230px; gap: 8px 28px; padding: 18px 0; border-bottom: 1px solid var(--line); }
@media (max-width: 699px) { .doc { grid-template-columns: 1fr; } }
.doc h4 { font-size: var(--fs-h4); }
.doc h4 a { color: var(--ink); text-decoration-color: var(--line-2); }
.doc h4 a:hover { color: var(--accent-ink); text-decoration-color: currentColor; }
.doc-host { margin-top: 2px; font-size: var(--fs-sm); color: var(--ink-3); }
.doc-why { margin-top: 6px; font-size: var(--fs-md); color: var(--ink-2); }
.doc-deadline { font: 400 var(--fs-sm)/1.5 var(--mono); color: var(--ink); }
.doc-deadline span { display: block; color: var(--ink-3); font-size: var(--fs-label); letter-spacing: .12em; text-transform: uppercase; }
.groups-tools { display: grid; gap: 12px; margin-bottom: 14px; }
.search { display: flex; align-items: center; gap: 10px; max-width: 520px; padding: 0 14px; border: 1px solid var(--line-2); border-radius: 6px; background: var(--surface); color: var(--ink-3); transition: border-color .2s, box-shadow .2s; }
.search:focus-within { border-color: var(--accent); box-shadow: 0 0 0 4px var(--accent-glow); }
.search .i { width: 19px; height: 19px; }
.search input { flex: 1; min-width: 0; padding: 12px 0; border: 0; outline: none; background: transparent; color: var(--ink); font: 400 1rem var(--sans); }
.search input::placeholder { color: var(--ink-3); }
.groups-count { margin-bottom: 14px; font: 400 var(--fs-xs) var(--mono); color: var(--ink-3); }
.group-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 32px; }
@media (max-width: 759px) { .group-list { grid-template-columns: 1fr; } }
.group { padding: 18px 0; border-top: 1px solid var(--line); }
.group h4 { font-size: var(--fs-h4); }
.group h4 a { color: var(--ink); text-decoration-color: var(--line-2); }
.group h4 a:hover { color: var(--accent-ink); text-decoration-color: currentColor; }
.group-people { margin-top: 4px; font-size: var(--fs-sm); color: var(--accent-ink); }
.group-topic { margin-top: 6px; font-size: var(--fs-md); color: var(--ink-2); }
.group-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; margin-top: 10px; font-size: var(--fs-xs); color: var(--ink-3); }
.group-dept { margin-right: 4px; }
.groups-empty { padding: 20px 0; color: var(--ink-2); }
.start-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: clamp(28px, 5vw, 64px); align-items: start; }
@media (max-width: 859px) { .start-grid { grid-template-columns: 1fr; } }
.res-list { display: grid; gap: 10px; }
.res { display: flex; flex-direction: column; padding: 14px 16px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); text-decoration: none; transition: border-color .2s, transform .25s var(--ease); }
.res:hover { border-color: var(--accent); transform: translateX(3px); }
.res-title { color: var(--ink); font-weight: 600; }
.res-body { margin-top: 2px; color: var(--ink-2); font-size: var(--fs-md); }

/* ---------- about ---------- */
.pair { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
@media (max-width: 759px) { .pair { grid-template-columns: 1fr; } }
.pair-col { padding: clamp(20px, 3vw, 30px); border: 1px solid var(--line); border-radius: var(--radius-lg); background: var(--surface); }
.pair-col-accent { background: var(--accent-tint); border-color: transparent; }
.plain-list { display: grid; gap: 14px; }
.plain-list li { font-size: 1.06rem; line-height: 1.45; color: var(--ink); }
.check-list li { display: flex; gap: 12px; align-items: flex-start; }
.check-list .i { width: 20px; height: 20px; margin-top: 2px; color: var(--accent-ink); }
.check-list.big li { font-size: 1.12rem; }
.people-contact { display: grid; gap: 28px; }
.people { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 260px), 1fr)); gap: 12px; }
.person { display: flex; gap: 14px; padding: 16px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.person-icon { display: inline-grid; place-items: center; width: 40px; height: 40px; border-radius: 6px; background: var(--accent-tint); color: var(--accent-ink); }
.person-icon .i { width: 20px; height: 20px; }
.person-name { font-weight: 600; }
.person-role { color: var(--ink-2); font-size: var(--fs-md); }
.person-dept { color: var(--ink-3); font: 400 var(--fs-xs) var(--mono); }
.fine .h-sub, .two-col h2.h-sub { margin-bottom: 0; font-size: var(--fs-label); letter-spacing: .14em; }
.fine-text { display: grid; gap: 12px; max-width: 46em; font-size: var(--fs-md); color: var(--ink-2); }

/* ---------- footer ---------- */
.site-footer { padding-block: 56px 40px; border-top: 1px solid var(--line); background: var(--sunk); }
.footer-grid { display: grid; grid-template-columns: minmax(0, 1.4fr) repeat(3, minmax(0, .8fr)); gap: 32px; }
@media (max-width: 899px) { .footer-grid { grid-template-columns: 1fr 1fr; } .footer-brand { grid-column: 1 / -1; } }
.footer-logo { display: inline-block; }
.footer-logo .logo-lockup { height: 64px; width: auto; }
.footer-brand p { margin-top: 16px; max-width: 28em; font-size: var(--fs-sm); color: var(--ink-2); }
.footer-col h2 { margin-bottom: 12px; font: 500 var(--fs-label)/1.3 var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--ink-3); }
.footer-col ul { display: grid; gap: 8px; }
.footer-col a { color: var(--ink-2); text-decoration: none; font-size: var(--fs-sm); }
.footer-col a:hover { color: var(--accent-ink); text-decoration: underline; }
.footer-col p { font-size: var(--fs-sm); color: var(--ink-3); }
.contact-person { display: grid; gap: 2px; }
.cp-name { color: var(--ink); font-weight: 600; font-size: var(--fs-md); }
.cp-role { color: var(--ink-3); font-size: var(--fs-sm); }
.cp-mail { margin-top: 6px; font: 400 var(--fs-sm) var(--mono); color: var(--accent-ink) !important; }
.disclaimer { grid-column: 1 / -1; padding-top: 22px; border-top: 1px solid var(--line); font-size: var(--fs-xs); color: var(--ink-3); }
.disclaimer span { display: block; max-width: 76em; }

/* ---------- motion ---------- */
@keyframes rise { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }
@keyframes fade { from { opacity: 0; } to { opacity: 1; } }
@keyframes pulse { 0% { opacity: .9; transform: scale(.6); } 80%, 100% { opacity: 0; transform: scale(1.9); } }
@keyframes vt-out { to { opacity: 0; transform: translateY(-6px); } }
@keyframes vt-in { from { opacity: 0; transform: translateY(10px); } }

/* Content rises in as it scrolls into view. The boot script removes .motion if site.js never starts, so nothing stays hidden. */
.motion [data-reveal] { opacity: 0; transform: translateY(16px); }
.motion [data-reveal].is-in { opacity: 1; transform: none; transition: opacity .7s var(--ease) var(--d, 0s), transform .7s var(--ease) var(--d, 0s); }
.motion [data-hero] { animation: rise .8s var(--ease) both; }
.motion [data-hero]:nth-child(2) { animation-delay: .08s; }
.motion [data-hero]:nth-child(3) { animation-delay: .16s; }
.motion [data-hero]:nth-child(4) { animation-delay: .24s; }
.motion [data-hero]:nth-child(5) { animation-delay: .32s; }
.motion .hero-visual { animation: fade 1.2s var(--ease) both .2s; }
.motion .is-shown { animation: rise .45s var(--ease) both; }
.motion .rung .on { transition: fill-opacity .5s var(--ease); }

::view-transition-old(root) { animation: vt-out .22s var(--ease) both; }
::view-transition-new(root) { animation: vt-in .38s var(--ease) both; }
::view-transition-group(site-header) { animation-duration: 0s; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; }
  ::view-transition-group(*), ::view-transition-old(*), ::view-transition-new(*) { animation: none !important; }
}

@media print {
  .site-header, .filterbar, .theme-toggle, .hero-cta, .site-footer nav, .skip, .hero-visual, .erow-add { display: none !important; }
  body { background: #fff; color: #000; }
  .claim-more > :not(summary) { display: block; }
  .section { padding-block: 24px; }
  .motion [data-reveal] { opacity: 1 !important; transform: none !important; }
}