/* ==========================================================================
   OpenMobile-2 — project page
   Two themes off one token set. Dark is mint on ink with a faint screen grid;
   light is the same palette on cool paper. Layout follows the OSReward page
   (split hero, then article sections) with left-aligned section heads.
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Tokens — dark (default)
   -------------------------------------------------------------------------- */
:root {
  color-scheme: dark;

  /* Accent: mint on ink. Used for links, eyebrows, the primary button and
     highlighted rows. */
  --accent-100: #e3fbf6;
  --accent-200: #b7f2e6;
  --accent-300: #6fe3cf;
  --accent-400: #39cdb5;
  --accent-500: #1fa893;
  --accent-600: #157f6f;

  /* Pop: coral, reserved for app-native tool calls and the hybrid lane */
  --pop-300: #ffb199;
  --pop-400: #ff8f6b;
  --pop-500: #e8724c;

  /* Cyan — screens, plots, live data */
  --cyan-200: #a8e8f2;
  --cyan-300: #6fcfe0;
  --cyan-400: #3fb2c9;
  --cyan-500: #1d86a6;

  /* Domains (also in om2-data.js; keep in step) */
  --dom-lifestyle: #5ec8f2;
  --dom-productivity: #a78bfa;
  --dom-entertainment: #f472b6;
  --dom-shopping: #fbbf24;
  --dom-travel: #34d399;
  --dom-social: #60a5fa;
  --dom-finance: #fb7185;

  /* Text */
  --text-hi: #f2f6fa;
  --text: #c3cdd8;
  --text-dim: #8b98a8;
  --text-faint: #65717f;

  /* Semantic (charts) */
  --ok: #4fd1a5;
  --bad: #ff7b72;

  /* Surfaces */
  --bg: #0a0e13;
  --surface-1: rgba(26, 34, 45, 0.74);
  --surface-1b: rgba(18, 25, 34, 0.78);
  --surface-2: rgba(22, 30, 40, 0.94);
  --surface-3: rgba(13, 18, 25, 0.98);
  --ring: #0a0e13;

  --hairline: rgba(111, 227, 207, 0.16);
  --hairline-strong: rgba(111, 227, 207, 0.34);
  --hairline-cool: rgba(148, 163, 184, 0.16);

  /* Charts */
  --chart-grid: rgba(148, 163, 184, 0.12);
  --chart-grid-minor: rgba(148, 163, 184, 0.06);
  --chart-axis: rgba(148, 163, 184, 0.3);
  --chart-track: rgba(148, 163, 184, 0.08);
  --logo-plate: rgba(238, 245, 252, 0.94);

  /* Type */
  --font-display: "Sora", "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;

  /* Rhythm */
  --page: 1560px;        /* content sections */
  --page-wide: 1700px;   /* widest tables */
  --page-hero: 1500px;   /* hero + byline */
  --r-sm: 6px;
  --r: 10px;
  --r-lg: 14px;

  --shadow: 0 14px 34px -20px rgba(0, 0, 0, 0.8);
  --edge-hi: rgba(255, 255, 255, 0.07);   /* lit top edge of a surface */
  --edge-lo: rgba(0, 0, 0, 0.38);         /* contact shadow under it   */
  --glow: rgba(57, 205, 181, 0.22);        /* accent bloom              */
  --noise-opacity: 0.055;
}

/* --------------------------------------------------------------------------
   2. Tokens — light
   -------------------------------------------------------------------------- */
:root[data-theme="light"] {
  color-scheme: light;

  /* The accent ramp inverts so 100 stays the strongest text colour on paper */
  --accent-100: #0b574b;
  --accent-200: #0f6a5c;
  --accent-300: #12806f;
  --accent-400: #15917a;
  --accent-500: #1aa68c;
  --accent-600: #4cc0a8;

  --pop-300: #a8441f;
  --pop-400: #c2552d;
  --pop-500: #de6b43;

  --cyan-200: #10556b;
  --cyan-300: #14708c;
  --cyan-400: #1a89a6;
  --cyan-500: #2aa0bd;

  --dom-lifestyle: #1f8fbd;
  --dom-productivity: #6d4fd6;
  --dom-entertainment: #c2358a;
  --dom-shopping: #b7791f;
  --dom-travel: #1f8f63;
  --dom-social: #2f6fd1;
  --dom-finance: #d13d55;

  --text-hi: #0f172a;
  --text: #334155;
  --text-dim: #5b6b7f;
  --text-faint: #7b8898;

  --ok: #15803d;
  --bad: #c2410c;

  --bg: #f5f8fb;
  --surface-1: rgba(255, 255, 255, 0.86);
  --surface-1b: rgba(250, 252, 254, 0.9);
  --surface-2: rgba(255, 255, 255, 0.96);
  --surface-3: rgba(255, 255, 255, 0.99);
  --ring: #f5f8fb;

  --hairline: rgba(18, 128, 111, 0.2);
  --hairline-strong: rgba(18, 128, 111, 0.42);
  --hairline-cool: rgba(51, 65, 85, 0.14);

  --chart-grid: rgba(51, 65, 85, 0.12);
  --chart-grid-minor: rgba(51, 65, 85, 0.06);
  --chart-axis: rgba(51, 65, 85, 0.32);
  --chart-track: rgba(51, 65, 85, 0.07);
  --logo-plate: rgba(255, 255, 255, 0);

  --shadow: 0 12px 30px -20px rgba(15, 23, 42, 0.35);
  --edge-hi: rgba(255, 255, 255, 0.95);
  --edge-lo: rgba(15, 23, 42, 0.07);
  --glow: rgba(21, 145, 122, 0.16);
  --noise-opacity: 0.04;
}

/* --------------------------------------------------------------------------
   3. Reset & base
   -------------------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 78px;
  -webkit-text-size-adjust: 100%;
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16.5px;
  line-height: 1.66;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  font-feature-settings: "kern" 1, "liga" 1;
  transition: background-color 0.25s ease, color 0.25s ease;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 500;
  color: var(--text-hi);
  letter-spacing: -0.01em;
  margin: 0 0 0.5em;
  line-height: 1.2;
}

p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }

a { color: var(--accent-300); text-decoration: none; transition: color 0.18s ease; }
a:hover { color: var(--accent-200); }

strong { color: var(--text-hi); font-weight: 600; }
em { color: var(--accent-200); font-style: italic; }

code, kbd {
  font-family: var(--font-mono);
  font-size: 0.87em;
  color: var(--cyan-200);
  background: var(--chart-track);
  border: 1px solid var(--hairline-cool);
  border-radius: 5px;
  padding: 0.08em 0.36em;
}

::selection { background: rgba(111, 227, 207, 0.3); }

:focus-visible { outline: 2px solid var(--accent-400); outline-offset: 3px; border-radius: 4px; }

.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

.skip-link {
  position: absolute; left: 50%; top: -80px; transform: translateX(-50%);
  z-index: 200; background: var(--surface-3); color: var(--accent-300);
  border: 1px solid var(--hairline-strong); border-radius: 0 0 10px 10px;
  padding: 11px 20px; font-size: 15px; transition: top 0.2s ease;
}
.skip-link:focus { top: 0; }

/* --------------------------------------------------------------------------
   4. Backdrop
   -------------------------------------------------------------------------- */
.cosmos {
  position: fixed;
  inset: 0;
  z-index: -2;
  pointer-events: none;
  background:
    radial-gradient(900px 560px at 10% -8%, rgba(31, 168, 147, 0.20), transparent 64%),
    radial-gradient(820px 520px at 92% 6%, rgba(124, 92, 246, 0.18), transparent 62%),
    radial-gradient(1000px 700px at 70% 70%, rgba(31, 168, 147, 0.07), transparent 66%),
    linear-gradient(170deg, #0d1219 0%, #0a0e13 48%, #090d12 100%);
}
/* a faint grid, fading out below the hero: the page sits on a screen, not a sky */
.cosmos::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(148, 163, 184, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 163, 184, 0.08) 1px, transparent 1px);
  background-size: 44px 44px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9) 0%, rgba(0, 0, 0, 0.35) 38%, transparent 72%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9) 0%, rgba(0, 0, 0, 0.35) 38%, transparent 72%);
}
:root[data-theme="light"] .cosmos {
  background:
    radial-gradient(900px 560px at 10% -8%, rgba(26, 166, 140, 0.16), transparent 64%),
    radial-gradient(820px 520px at 92% 6%, rgba(124, 92, 246, 0.12), transparent 62%),
    linear-gradient(180deg, #f8fafc 0%, #f5f8fb 50%, #f3f6fa 100%);
}
:root[data-theme="light"] .cosmos::after {
  background-image:
    linear-gradient(rgba(51, 65, 85, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(51, 65, 85, 0.07) 1px, transparent 1px);
}

/* --------------------------------------------------------------------------
   5. Layout
   -------------------------------------------------------------------------- */
.wrap { width: 100%; max-width: var(--page); margin: 0 auto; padding: 0 26px; }
.wrap-wide { max-width: var(--page-wide); }

section { position: relative; }

.band { padding: 78px 0; }
.band-tight { padding: 52px 0; }

.section-head { text-align: left; max-width: 950px; margin: 0 0 36px; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent-400);
  margin-bottom: 14px;
}
.eyebrow::before {
  content: "";
  width: 18px; height: 2px;
  border-radius: 2px;
  background: currentColor;
  opacity: 0.8;
}

h2.section-title { font-size: clamp(28px, 3.6vw, 38px); margin-bottom: 12px; }
.section-sub { color: var(--text-dim); font-size: 17px; max-width: 760px; margin: 0; }

/* Accent gradient text, for the keyword in a title */
.accent {
  background: linear-gradient(176deg, var(--accent-200) 6%, var(--accent-300) 42%, var(--accent-500) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}
:root[data-theme="light"] .accent {
  background: linear-gradient(176deg, var(--accent-400) 4%, var(--accent-300) 46%, var(--accent-100) 100%);
  -webkit-background-clip: text;
  background-clip: text;
}

/* --------------------------------------------------------------------------
   6. Navigation
   -------------------------------------------------------------------------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: 60px;
  display: flex;
  align-items: center;
  border-bottom: 1px solid transparent;
  transition: background 0.25s ease, border-color 0.25s ease;
}
.nav.stuck {
  background: var(--surface-3);
  backdrop-filter: blur(14px) saturate(1.2);
  -webkit-backdrop-filter: blur(14px) saturate(1.2);
  border-bottom-color: var(--hairline);
}
.nav .wrap { max-width: var(--page-wide); display: flex; align-items: center; gap: 18px; }

.nav-brand {
  display: flex; align-items: center; gap: 9px;
  font-family: var(--font-display);
  font-size: 18px; font-weight: 600;
  white-space: nowrap;
  color: var(--text-hi);
  opacity: 0;
  transform: translateY(-4px);
  transition: opacity 0.25s ease, transform 0.25s ease;
  pointer-events: none;
}
.nav.stuck .nav-brand { opacity: 1; transform: none; pointer-events: auto; }
.nav-brand img { width: 30px; height: 30px; }
.nav-brand i { font-style: normal; color: var(--accent-400); font-weight: 400; padding: 0 1px; }

.nav-links {
  margin-left: auto;
  display: flex; align-items: center; gap: 2px;
  list-style: none; padding: 0; margin-block: 0;
}
.nav-links a {
  display: block;
  padding: 7px 12px;
  font-size: 14px; font-weight: 500;
  color: var(--text-dim);
  border-radius: 8px;
  transition: color 0.16s ease, background 0.16s ease;
}
.nav-links a:hover { color: var(--accent-300); background: var(--chart-track); }
.nav-links a.active { color: var(--accent-300); }

/* "More research" — the sibling-project menu the reference pages carry */
.nav-more { position: relative; }
.nav-more > button {
  appearance: none;
  display: inline-flex; align-items: center; gap: 5px;
  padding: 7px 12px;
  font-family: inherit;
  font-size: 14px; font-weight: 500;
  color: var(--text-dim);
  background: none; border: 0;
  border-radius: 8px;
  cursor: pointer;
  transition: color 0.16s ease, background 0.16s ease;
}
.nav-more > button:hover,
.nav-more[data-open="true"] > button { color: var(--accent-300); background: var(--chart-track); }
.nav-more > button svg { width: 10px; height: 10px; transition: transform 0.18s ease; }
.nav-more[data-open="true"] > button svg { transform: rotate(180deg); }
.nav-more ul {
  position: absolute;
  top: calc(100% + 8px); left: 0;
  min-width: 268px;
  list-style: none;
  margin: 0; padding: 6px;
  border-radius: 12px;
  background: var(--surface-3);
  border: 1px solid var(--hairline);
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
  display: none;
  z-index: 30;
}
.nav-more[data-open="true"] ul { display: block; }
.nav-more ul a {
  display: flex; align-items: center; gap: 10px;
  padding: 7px 10px;
  border-radius: 9px;
  font-size: 13.5px;
  color: var(--text);
  white-space: nowrap;
}
.nav-more ul a:hover { background: var(--chart-track); color: var(--accent-300); }
.nav-more ul a > span { display: flex; flex-direction: column; line-height: 1.3; }
.nav-more ul a small { color: var(--text-faint); font-size: 11px; }
.nav-more ul a img {
  flex: none;
  width: 28px; height: 28px;
  border-radius: 7px;
  object-fit: contain;
}
/* These are detailed illustrations, not flat marks: at 28 px on the dark menu
   they go muddy. A light plate gives each one the same ground to sit on — and
   matches OS-Atlas, whose artwork already carries its own white card. */
:root:not([data-theme="light"]) .nav-more ul a img {
  background: rgba(242, 246, 252, 0.94);
  box-shadow: 0 0 0 1px var(--hairline);
  padding: 2px;
}

.nav-tools { display: flex; align-items: center; gap: 8px; margin-left: 8px; }

.icon-btn {
  appearance: none;
  width: 34px; height: 34px;
  display: grid; place-items: center;
  border-radius: 9px;
  border: 1px solid var(--hairline);
  background: var(--chart-track);
  color: var(--accent-300);
  cursor: pointer;
  transition: color 0.16s ease, border-color 0.16s ease, background 0.16s ease;
}
.icon-btn:hover { color: var(--accent-200); border-color: var(--hairline-strong); }
.icon-btn svg { width: 16px; height: 16px; }
/* one icon per theme */
.icon-btn .i-sun { display: none; }
:root[data-theme="light"] .icon-btn .i-sun { display: block; }
:root[data-theme="light"] .icon-btn .i-moon { display: none; }

.nav-toggle { display: none; }

/* --------------------------------------------------------------------------
   7. Hero — split, following the reference pages
   -------------------------------------------------------------------------- */
.hero { position: relative; padding: 100px 0 40px; overflow: hidden; }

/* A soft glow behind the hero: mint on the left, violet behind the art on
   the right, both fading to nothing before the first section. */
.hero::before {
  content: "";
  position: absolute;
  inset: -180px -12% -60px;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(58% 62% at 74% 46%, rgba(57, 205, 181, 0.14), transparent 72%),
    radial-gradient(38% 46% at 84% 30%, rgba(124, 92, 246, 0.22), transparent 74%),
    radial-gradient(64% 70% at 18% 24%, rgba(31, 168, 147, 0.12), transparent 72%),
    radial-gradient(50% 44% at 46% 96%, rgba(20, 30, 44, 0.5), transparent 76%);
  -webkit-mask-image: linear-gradient(180deg, #000 0%, #000 62%, transparent 100%);
  mask-image: linear-gradient(180deg, #000 0%, #000 62%, transparent 100%);
}
:root[data-theme="light"] .hero::before {
  background:
    radial-gradient(58% 62% at 74% 46%, rgba(187, 240, 228, 0.5), transparent 72%),
    radial-gradient(38% 46% at 84% 28%, rgba(216, 204, 252, 0.5), transparent 74%),
    radial-gradient(64% 70% at 18% 24%, rgba(214, 236, 232, 0.5), transparent 72%);
}

.hero-split {
  display: grid;
  grid-template-columns: minmax(0, 1.16fr) minmax(0, 0.84fr);
  gap: 54px;
  align-items: center;
  max-width: var(--page-hero);
}

.hero h1 {
  font-size: clamp(40px, 5.2vw, 70px);
  line-height: 1;
  letter-spacing: -0.03em;
  font-weight: 700;
  margin: 0 0 10px;
}
.hero .tagline {
  font-family: var(--font-display);
  font-size: clamp(21px, 2.35vw, 27px);
  font-weight: 400;
  line-height: 1.3;
  color: var(--text-hi);
  margin: 0 0 10px;
}
.hero .venue {
  font-size: 12.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-400);
  font-weight: 600;
  margin-bottom: 18px;
}
.hero .lede { font-size: 16.5px; color: var(--text-dim); margin-bottom: 20px; }

/* the four hero bullets the reference pages use */
.bullets { list-style: none; padding: 0; margin: 0 0 24px; display: grid; gap: 10px; }
.bullets li { display: flex; gap: 11px; align-items: flex-start; font-size: 15px; color: var(--text); }
.bullets .b-ico {
  flex: none;
  width: 26px; height: 26px;
  display: grid; place-items: center;
  border-radius: 7px;
  color: var(--accent-300);
  background: var(--chart-track);
  border: 1px solid var(--hairline);
  margin-top: 1px;
}
.bullets .b-ico svg { width: 14px; height: 14px; }
.bullets b { color: var(--text-hi); font-weight: 600; }

/* Cover plate (kept for a future framed cover). Dark theme: a thin accent edge.
   Light theme: the art is deep navy on warm paper, so it is matted like a
   framed print, a pale mat and a fine accent rule, which is what
   makes a dark image sit on a light page instead of punching a hole in it. */
.plate {
  margin: 0;
  position: relative;
  border-radius: var(--r-lg);
  padding: 6px;
  background: linear-gradient(150deg, rgba(111, 227, 207, 0.42), rgba(122, 158, 200, 0.10) 52%, rgba(111, 227, 207, 0.22));
  box-shadow:
    0 26px 80px -34px rgba(16, 60, 124, 0.85),
    0 0 110px -24px rgba(31, 168, 147, 0.30);
}
.plate img { display: block; width: 100%; height: auto; border-radius: 12px; }

:root[data-theme="light"] .plate {
  padding: 20px;
  border-radius: 6px;
  background: linear-gradient(168deg, #fffdf8 0%, #f6f1e4 100%);
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.9) inset,
    0 0 0 1px rgba(18, 128, 111, 0.28),
    0 22px 44px -26px rgba(60, 45, 15, 0.55);
}
:root[data-theme="light"] .plate::after {
  /* the fine rule between mat and image */
  content: "";
  position: absolute;
  inset: 14px;
  border: 1px solid rgba(18, 128, 111, 0.42);
  border-radius: 4px;
  pointer-events: none;
}
:root[data-theme="light"] .plate img {
  border-radius: 2px;
  box-shadow: 0 2px 10px -3px rgba(20, 36, 60, 0.5);
}

/* Hero art without a plate: a transparent logo mark floats on the page with
   a soft glow. Swap to <figure class="hero-art plate"> for framed key art. */
.hero-logo { margin: 0; display: grid; place-items: center; }
.hero-logo img {
  display: block;
  width: min(100%, 520px);
  height: auto;
  filter: drop-shadow(0 24px 60px rgba(84, 104, 226, 0.34));
}
:root[data-theme="light"] .hero-logo img { filter: drop-shadow(0 18px 40px rgba(60, 72, 160, 0.22)); }

/* --------------------------------------------------------------------------
   8. Byline band
   -------------------------------------------------------------------------- */
/* The byline sits on the page, not on a panel: hairlines above and below, no
   background, so no white slab lands in the dark theme. */
.byline { padding: 4px 0 2px; }
.byline .panel {
  max-width: var(--page-hero);
  margin: 0 auto;
  border-top: 1px solid var(--hairline-cool);
  border-bottom: 1px solid var(--hairline-cool);
  padding: 24px 30px 22px;
  text-align: center;
}

.authors {
  max-width: 940px;
  margin: 0 auto 16px;
  font-size: 16px;
  line-height: 1.95;
  color: var(--text-hi);
  font-weight: 450;
}
/* No underlines in the byline, linked or not — hover colour is the only cue. */
.authors a { color: inherit; text-decoration: none; }
.authors a:hover { color: var(--accent-300); }
.authors .au { white-space: nowrap; }
.authors .lead { display: block; }   /* the equal-contribution authors keep their own line */
.authors .au.eq { color: var(--accent-300); font-weight: 600; }
.authors .au.eq a:hover { color: var(--accent-200); }
.authors sup { font-size: 0.64em; color: var(--accent-400); font-weight: 600; margin-left: 1px; }

/* Affiliations: a small mark attached to the left of each name */
.affils {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 20px;
  max-width: 1000px;
  margin: 0 auto;
  padding: 0;
  list-style: none;
  font-size: 14px;
  color: var(--text-dim);
}
.affils li { display: inline-flex; align-items: center; gap: 9px; }
.affils sup { color: var(--accent-400); font-weight: 600; font-size: 0.72em; padding-right: 1px; }
.affils .mark {
  flex: none;
  width: 28px; height: 28px;
  display: grid; place-items: center;
}
.affils .mark img { width: 24px; height: 24px; object-fit: contain; display: block; }
/* Two files per crest rather than a CSS filter. A flat silhouette blanks out
   the filled crests (HKU, NUS) into white lozenges; the pre-rendered dark
   variant keeps every crest's internal structure. */
.affils .mark .dk { display: none; }
:root:not([data-theme="light"]) .affils .mark .lt { display: none; }
:root:not([data-theme="light"]) .affils .mark .dk { display: block; }
.legend { margin: 16px 0 0; font-size: 13px; color: var(--text-faint); }
.legend sup { color: var(--accent-400); }
.eq-key { color: var(--accent-300); font-weight: 600; }

/* --------------------------------------------------------------------------
   9. Link row
   -------------------------------------------------------------------------- */
.links { display: flex; flex-wrap: wrap; gap: 6px; margin: 0; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  height: 36px;
  padding: 0 12px;
  border-radius: 999px;
  font-size: 12.8px;
  font-weight: 550;
  white-space: nowrap;
  color: var(--text-hi);
  background: var(--surface-1);
  border: 1px solid var(--hairline-cool);
  transition: transform 0.15s ease, border-color 0.18s ease, color 0.18s ease, background 0.18s ease;
}
.btn svg, .btn .ic { width: 15px; height: 15px; flex: none; font-size: 14px; line-height: 1; }
.btn:hover {
  color: var(--text-hi);
  transform: translateY(-1px);
  border-color: var(--hairline-strong);
  background: var(--surface-2);
}
.btn:active { transform: none; }

.btn-primary {
  background: var(--accent-400);
  border-color: transparent;
  color: #06201b;
  font-weight: 650;
}
.btn-primary:hover { background: var(--accent-300); color: #06201b; }
:root[data-theme="light"] .btn-primary { background: var(--accent-400); color: #fff; }
:root[data-theme="light"] .btn-primary:hover { background: var(--accent-300); color: #fff; }

/* Parked links: clearly not-yet-live, but still readable. The dashed border
   carries the "not yet" signal, so the label itself keeps normal contrast. */
.btn.pending {
  color: var(--text-dim);
  border-style: dashed;
  border-color: var(--hairline-strong);
  background: transparent;
  cursor: default;
}
.btn.pending:hover { transform: none; color: var(--text); background: var(--chart-track); }
.btn.btn-primary.pending {
  color: var(--accent-300);
  border-color: var(--accent-400);
  background: var(--chart-track);
  font-weight: 600;
}
.btn.btn-primary.pending:hover { color: var(--accent-200); background: var(--chart-track); }


/* --------------------------------------------------------------------------
   10. Cards & panels
   -------------------------------------------------------------------------- */
.card {
  position: relative;
  background: var(--surface-1);
  border: 1px solid var(--hairline-cool);
  border-radius: var(--r-lg);
  padding: 26px 28px;
  box-shadow: var(--shadow);
}
.card h3 { font-size: 21px; margin-bottom: 10px; }

.abstract { max-width: 1120px; margin: 0 auto; padding: 30px 44px 32px; font-size: 16.5px; line-height: 1.72; }

ol.contribs {
  counter-reset: c;
  list-style: none;
  margin: 22px 0 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--hairline-cool);
  display: grid;
  gap: 16px;
}
ol.contribs li {
  counter-increment: c;
  position: relative;
  padding-left: 40px;
  font-size: 15.5px;
  line-height: 1.62;
  color: var(--text-dim);
}
ol.contribs li::before {
  content: counter(c);
  position: absolute;
  left: 0; top: 1px;
  width: 26px; height: 26px;
  display: grid; place-items: center;
  border-radius: 50%;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--accent-300);
  background: var(--chart-track);
  border: 1px solid var(--hairline);
}
ol.contribs a { color: inherit; }
ol.contribs a b {
  color: var(--text-hi);
  border-bottom: 1px solid var(--hairline-strong);
  transition: color 0.16s ease;
}
ol.contribs a:hover b { color: var(--accent-300); }

.grid { display: grid; gap: 20px; }
.grid > * { min-width: 0; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.feature { padding: 24px 24px; }
.feature .ico {
  width: 38px; height: 38px;
  display: grid; place-items: center;
  border-radius: 10px;
  margin-bottom: 14px;
  background: var(--chart-track);
  border: 1px solid var(--hairline);
  color: var(--accent-300);
}
.feature .ico svg { width: 19px; height: 19px; }
.feature h3 { font-size: 19px; margin-bottom: 7px; }
.feature p { font-size: 15px; color: var(--text-dim); margin: 0; line-height: 1.6; }

a.card.feature { transition: transform 0.16s ease, border-color 0.18s ease; }
a.card.feature:not(.pending-card):hover { transform: translateY(-2px); border-color: var(--hairline-strong); }
.pending-card { cursor: default; }
.pending-card .ico { opacity: 0.65; }
.pending-card .soon {
  font-size: 10px;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--accent-500);
  border: 1px dashed var(--hairline-strong);
  border-radius: 6px;
  padding: 3px 8px;
}

.takeaway {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 18px 22px;
  border-radius: var(--r);
  background: var(--surface-1b);
  border: 1px solid var(--hairline-cool);
  border-left: 3px solid var(--accent-500);
  font-size: 15.5px;
  color: var(--text-hi);
}
.takeaway .k {
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent-400);
  padding-top: 5px;
  flex: none;
}
.takeaway p { margin: 0; line-height: 1.6; }

.step-n {
  display: inline-grid; place-items: center;
  width: 22px; height: 22px;
  border-radius: 50%;
  font-family: var(--font-mono);
  font-size: 11.5px; font-weight: 600;
  color: var(--accent-300);
  background: var(--chart-track);
  border: 1px solid var(--hairline);
}

/* News: newest first, month granularity unless a day matters */
.news { padding: 22px 26px; }
.news .eyebrow { margin-bottom: 12px; }
.news ul { list-style: none; padding: 0; margin: 0; font-size: 15.5px; line-height: 1.9; }
.news time {
  color: var(--accent-300);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  margin-right: 0.8em;
}

/* Template placeholder: a dashed, empty block marking where content goes.
   Drop the class once the block holds real content. */
.slot {
  min-height: 220px;
  background: transparent;
  border: 1px dashed var(--hairline-strong);
  box-shadow: none;
}
.slot.short { min-height: 120px; }
.hero-art { margin: 0; min-width: 0; }
/* the hero's key-art slot: a square the size the cover will take */
.hero-art.slot {
  margin: 0 auto;
  width: min(100%, 520px);
  aspect-ratio: 1 / 1;
  min-height: 0;
  border-radius: var(--r-lg);
}

/* --------------------------------------------------------------------------
   11. Flow diagrams
   -------------------------------------------------------------------------- */
.flow { display: flex; align-items: stretch; gap: 0; }
.flow-node {
  position: relative;
  flex: 1 1 0;
  min-width: 0;
  padding: 16px 13px;
  border-radius: var(--r);
  background: var(--surface-1b);
  border: 1px solid var(--hairline-cool);
  text-align: center;
}
.flow-node.human { border-color: var(--hairline); }
.flow-node.out { border-color: rgba(88, 199, 164, 0.34); }
.flow-node h4 {
  font-family: var(--font-body);
  font-size: 14.5px; font-weight: 600;
  margin: 7px 0 5px;
  color: var(--text-hi);
  text-wrap: balance;
}
.flow-node p { font-size: 12.5px; color: var(--text-faint); margin: 0; line-height: 1.5; }
.flow-arrow {
  align-self: center;
  flex: 0 0 auto;
  color: var(--accent-500);
  padding: 0 8px;
  display: grid; place-items: center; gap: 3px;
}

/* --------------------------------------------------------------------------
   12. Tables
   -------------------------------------------------------------------------- */
.table-shell {
  border: 1px solid var(--hairline-cool);
  border-radius: var(--r);
  background: var(--surface-2);
  overflow: hidden;
}
.table-scroll { overflow-x: auto; overscroll-behavior-x: contain; -webkit-overflow-scrolling: touch; }
table.data {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
table.data thead th {
  position: sticky; top: 0; z-index: 2;
  background: var(--surface-3);
  color: var(--text-dim);
  font-size: 11px; font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  text-align: right;
  padding: 10px 12px;
  border-bottom: 1px solid var(--hairline);
  user-select: none;
}
table.data thead tr.group th {
  text-align: center;
  color: var(--accent-400);
  padding-bottom: 6px;
}
table.data thead th.sortable { cursor: pointer; }
table.data thead th.sortable:hover { color: var(--accent-300); }
table.data thead th .arrow { opacity: 0.26; margin-left: 5px; font-size: 9px; }
table.data thead th[aria-sort] .arrow { opacity: 1; color: var(--accent-300); }
table.data th:first-child, table.data td:first-child { text-align: left; padding-left: 16px; }
table.data td {
  padding: 8px 12px;
  text-align: right;
  border-bottom: 1px solid var(--chart-grid);
  color: var(--text);
}
table.data tbody tr:last-child td { border-bottom: none; }
table.data tbody tr { transition: background 0.14s ease; }
table.data tbody tr:hover { background: var(--chart-track); }
table.data tbody tr.ours { background: var(--chart-track); box-shadow: inset 3px 0 0 var(--accent-500); }
table.data tbody tr.ours:hover { background: var(--surface-1b); }
table.data td.best { color: var(--accent-300); font-weight: 650; }
table.data .rank {
  color: var(--text-faint);
  font-family: var(--font-mono);
  font-size: 11.5px;
  width: 32px;
  padding-right: 0;
  text-align: right;
}
.model-cell { display: flex; align-items: center; gap: 9px; }
.model-cell .nm { color: var(--text-hi); font-weight: 500; }

/* Several vendor marks are solid black on transparent and vanish on the dark
   page; a light disc makes every logo legible in both themes. */
.model-cell img,
.chip img,
.model-card .top img {
  background: var(--logo-plate);
  border-radius: 50%;
  padding: 2px;
  box-shadow: 0 0 0 1px var(--hairline);
}
.model-cell img { width: 20px; height: 20px; object-fit: contain; flex: none; }

.tag {
  font-size: 10px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-weight: 600;
  padding: 2px 6px;
  border-radius: 5px;
  border: 1px solid transparent;
}
.tag.closed { color: var(--text-faint); border-color: var(--hairline-cool); }
.tag.open { color: var(--cyan-400); border-color: var(--hairline-cool); }
.tag.ours { color: var(--accent-400); border-color: var(--hairline-strong); }

.cellbar { position: relative; display: inline-block; min-width: 44px; text-align: right; }
.cellbar i {
  position: absolute;
  left: 0; right: 0; bottom: -3px;
  height: 2px;
  background: var(--cyan-400);
  opacity: 0.7;
  border-radius: 2px;
  transform-origin: left;
}

/* --------------------------------------------------------------------------
   13. Controls
   -------------------------------------------------------------------------- */
.controls { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-bottom: 16px; }
.controls .spacer { flex: 1; }
.ctl-label {
  font-size: 11px;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--text-faint);
  font-weight: 600;
}

.seg {
  display: inline-flex;
  padding: 3px; gap: 2px;
  border-radius: 999px;
  background: var(--chart-track);
  border: 1px solid var(--hairline-cool);
}
.seg button {
  appearance: none; border: 0; background: none;
  color: var(--text-dim);
  font-family: inherit;
  font-size: 13px; font-weight: 550;
  padding: 5px 14px;
  border-radius: 999px;
  cursor: pointer;
  transition: color 0.16s ease, background 0.16s ease;
  white-space: nowrap;
}
.seg button:hover { color: var(--accent-300); }
.seg button[aria-pressed="true"] {
  color: #06201b;
  background: linear-gradient(180deg, var(--accent-300), var(--accent-500));
}
:root[data-theme="light"] .seg button[aria-pressed="true"] { color: #fffaf0; }

.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip {
  appearance: none;
  font-family: inherit;
  font-size: 12px; font-weight: 550;
  padding: 4px 11px;
  border-radius: 999px;
  cursor: pointer;
  color: var(--text-dim);
  background: transparent;
  border: 1px solid var(--hairline-cool);
  transition: all 0.16s ease;
  display: inline-flex; align-items: center; gap: 6px;
}
.chip:hover { color: var(--text-hi); border-color: var(--hairline-strong); }
.chip[aria-pressed="false"] { opacity: 0.4; }
/* our own models: a soft accent field instead of an "(ours)" suffix */
.chip-ours {
  background: linear-gradient(180deg, rgba(111, 227, 207, 0.20), rgba(111, 227, 207, 0.09));
  border-color: var(--hairline-strong);
  color: var(--accent-200);
  font-weight: 600;
}
.chip-ours:hover { color: var(--accent-100); border-color: var(--accent-400); }
.chip .dot { width: 8px; height: 8px; border-radius: 50%; flex: none; }

.search {
  flex: 1;
  min-width: 170px;
  max-width: 250px;
  height: 32px;
  padding: 0 12px;
  font-family: inherit;
  font-size: 13px;
  color: var(--text-hi);
  background: var(--chart-track);
  border: 1px solid var(--hairline-cool);
  border-radius: 999px;
}
.search::placeholder { color: var(--text-faint); }
.search:focus { outline: none; border-color: var(--hairline-strong); }

/* --------------------------------------------------------------------------
   14. Charts & figures
   -------------------------------------------------------------------------- */
.chart-card { padding: 26px 34px 22px; }
.chart-head { display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; margin-bottom: 4px; }
.chart-head h3 { font-size: 20px; margin: 0; }
.chart-note { font-size: 14px; color: var(--text-dim); margin: 0 0 16px; max-width: 980px; line-height: 1.6; }
.chart-body { position: relative; width: 100%; }
.chart-body svg { display: block; width: 100%; height: auto; overflow: visible; }

.legend-row {
  display: flex; flex-wrap: wrap;
  gap: 7px 17px;
  margin-top: 14px;
  font-size: 12.5px;
  color: var(--text-dim);
}
.legend-row .li { display: inline-flex; align-items: center; gap: 7px; white-space: nowrap; }
.legend-row .sw { width: 11px; height: 11px; border-radius: 3px; flex: none; }
.legend-row .sw.round { border-radius: 50%; }

figcaption { font-size: 13px; color: var(--text-faint); margin-top: 11px; line-height: 1.55; }

/* --------------------------------------------------------------------------
   15. Model cards
   -------------------------------------------------------------------------- */
.model-card { padding: 24px 26px; }
.model-card .top { display: flex; align-items: center; gap: 11px; margin-bottom: 12px; }
.model-card .top img { width: 32px; height: 32px; object-fit: contain; }
.model-card .top h3 { margin: 0; font-size: 20px; }
.model-card dl {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 6px 12px;
  margin: 14px 0 0;
  font-size: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--hairline-cool);
}
.model-card dt { color: var(--text-faint); }
.model-card dd { margin: 0; text-align: right; color: var(--text-hi); font-variant-numeric: tabular-nums; font-weight: 550; }
.model-card dd .up { color: var(--ok); font-size: 12px; margin-left: 5px; }

/* --------------------------------------------------------------------------
   16. BibTeX
   -------------------------------------------------------------------------- */
.bibtex {
  position: relative;
  background: var(--surface-2);
  border: 1px solid var(--hairline-cool);
  border-radius: var(--r);
  overflow: hidden;
}
.bibtex-bar {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 13px;
  border-bottom: 1px solid var(--hairline-cool);
  background: var(--chart-track);
}
.bibtex-bar .dots { display: flex; gap: 6px; }
.bibtex-bar .dots i { width: 8px; height: 8px; border-radius: 50%; background: var(--hairline-cool); }
.bibtex-bar .fn { font-family: var(--font-mono); font-size: 11.5px; color: var(--text-faint); }
.copy-btn {
  margin-left: auto;
  appearance: none;
  font-family: inherit;
  font-size: 12px; font-weight: 600;
  color: var(--accent-300);
  background: transparent;
  border: 1px solid var(--hairline-strong);
  border-radius: 7px;
  padding: 5px 11px;
  cursor: pointer;
  display: inline-flex; align-items: center; gap: 6px;
  transition: all 0.16s ease;
}
.copy-btn:hover { background: var(--chart-track); color: var(--accent-200); }
.copy-btn.done { color: var(--ok); border-color: var(--ok); }
.bibtex pre {
  margin: 0;
  padding: 18px 20px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.68;
  color: var(--text);
}

/* --------------------------------------------------------------------------
   17. Footer
   -------------------------------------------------------------------------- */
footer.site {
  border-top: 1px solid var(--hairline-cool);
  padding: 46px 0 38px;
  margin-top: 30px;
}
footer.site .cols { display: grid; grid-template-columns: 1.5fr 1fr 1fr; gap: 36px; margin-bottom: 28px; }
/* The footer sits outside <main>, so its column labels are top-level headings,
   not subsections of the last section. h2 keeps the outline free of a level
   skip; this rule carries the small-caps look the h4 used to give them. */
footer.site h2 {
  font-family: var(--font-body);
  font-size: 11px;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--accent-400);
  margin-bottom: 12px;
}
footer.site ul { list-style: none; padding: 0; margin: 0; font-size: 14px; line-height: 1.95; }
footer.site ul a { color: var(--text-dim); }
footer.site ul a:hover { color: var(--accent-300); }
footer.site .brand-line {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--font-display);
  font-size: 20px;
  color: var(--text-hi);
  margin-bottom: 9px;
}
footer.site .brand-line img { width: 34px; height: 34px; }
footer.site .fine {
  font-size: 12.5px;
  color: var(--text-faint);
  padding-top: 20px;
  border-top: 1px solid var(--hairline-cool);
  display: flex; flex-wrap: wrap; gap: 8px 18px; align-items: center;
}
footer.site .fine a { color: var(--text-dim); }

/* --------------------------------------------------------------------------
   17b. Widget controls, shared by the interactive components
   -------------------------------------------------------------------------- */
.wt-controls { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-top: 16px; }
.wt-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  height: 34px; min-width: 34px; padding: 0 12px;
  border-radius: 999px;
  border: 1px solid var(--hairline-strong);
  background: var(--surface-2);
  color: var(--text-hi);
  font: 500 13px/1 var(--font-body);
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease, color 0.15s ease;
}
.wt-btn:hover { border-color: var(--accent-400); color: var(--accent-200); }
.wt-btn[aria-pressed="true"], .wt-btn.active { background: var(--accent-400); border-color: transparent; color: #06201b; }
:root[data-theme="light"] .wt-btn[aria-pressed="true"], :root[data-theme="light"] .wt-btn.active { color: #fff; }
.wt-btn svg { width: 14px; height: 14px; }
.wt-btn:focus-visible { outline: 2px solid var(--accent-400); outline-offset: 2px; }
.wt-dots { display: flex; gap: 6px; list-style: none; margin: 0; padding: 0; }
.wt-dots button { width: 8px; height: 8px; padding: 0; border: 0; border-radius: 50%; background: var(--hairline-strong); cursor: pointer; transition: transform 0.15s ease, background 0.15s ease; }
.wt-dots button[aria-current="step"] { background: var(--accent-400); transform: scale(1.35); }
.wt-count { font: 500 12px var(--font-mono); color: var(--text-dim); margin-left: auto; }
.wt-tabs { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 14px; }
.wt-tab {
  height: 32px; padding: 0 12px; border-radius: var(--r-sm);
  border: 1px solid var(--hairline-cool);
  background: transparent; color: var(--text-dim);
  font: 500 13px/1 var(--font-body); cursor: pointer;
}
.wt-tab:hover { color: var(--text-hi); border-color: var(--hairline-strong); }
.wt-tab[aria-selected="true"], .wt-tab.active { color: var(--text-hi); background: var(--chart-track); border-color: var(--accent-400); }
.wt-tip {
  position: fixed; z-index: 60; pointer-events: none;
  max-width: 260px; padding: 8px 10px;
  border-radius: 8px;
  border: 1px solid var(--hairline-strong);
  background: var(--surface-3);
  box-shadow: var(--shadow);
  color: var(--text); font-size: 13px; line-height: 1.45;
  opacity: 0; transition: opacity 0.12s ease;
}
.wt-tip.on { opacity: 1; }
.wt-tip b { color: var(--text-hi); font-weight: 600; }
.wt-tip small { color: var(--text-dim); }
.wt-legend { display: flex; flex-wrap: wrap; gap: 8px 16px; font-size: 13px; color: var(--text-dim); }
.wt-legend i { display: inline-block; width: 10px; height: 10px; border-radius: 3px; margin-right: 6px; vertical-align: -1px; }
.wt-note { font-size: 13.5px; color: var(--text-dim); margin: 12px 0 0; }
.wt-kbd { font: 500 11px var(--font-mono); color: var(--text-faint); }

/* --------------------------------------------------------------------------
   17c. Material: grain, lit edges, layered shadows, section rhythm
   -------------------------------------------------------------------------- */
/* film grain over the whole backdrop, monochrome, barely there */
.cosmos::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='180' height='180'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/><feColorMatrix type='saturate' values='0'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
  background-size: 180px 180px;
  opacity: var(--noise-opacity);
  mix-blend-mode: overlay;
  pointer-events: none;
}
/* vignette so the edges of the page sit back */
.cosmos {
  box-shadow: inset 0 0 220px rgba(0, 0, 0, 0.35);
}
:root[data-theme="light"] .cosmos { box-shadow: inset 0 0 220px rgba(15, 23, 42, 0.05); }

/* cards: frosted over the grid, a faint top-down gradient, a lit top edge, a
   contact shadow and an ambient one. The lit edge is what makes a dark
   surface read as a surface. */
.card {
  backdrop-filter: blur(14px) saturate(1.15);
  -webkit-backdrop-filter: blur(14px) saturate(1.15);
  background-image: linear-gradient(180deg, color-mix(in srgb, var(--text-hi) 4.5%, transparent), transparent 46%);
  box-shadow:
    inset 0 1px 0 var(--edge-hi),
    0 1px 2px var(--edge-lo),
    0 22px 44px -28px rgba(0, 0, 0, 0.75);
}
:root[data-theme="light"] .card {
  box-shadow:
    inset 0 1px 0 var(--edge-hi),
    0 1px 2px var(--edge-lo),
    0 18px 36px -26px rgba(15, 23, 42, 0.28);
}
/* feature cards that link somewhere: an accent edge that fades in on hover */
a.card.feature {
  overflow: hidden;
  transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}
a.card.feature::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(135deg, var(--accent-400), transparent 48%, transparent 60%, var(--accent-600));
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  mask-composite: exclude;
  opacity: 0;
  transition: opacity 0.22s ease;
  pointer-events: none;
}
a.card.feature:not(.pending-card):hover::after { opacity: 1; }
a.card.feature:not(.pending-card):hover {
  transform: translateY(-3px);
  box-shadow:
    inset 0 1px 0 var(--edge-hi),
    0 1px 2px var(--edge-lo),
    0 26px 48px -26px rgba(0, 0, 0, 0.8),
    0 0 0 1px var(--hairline);
}
.feature .ico {
  background-image: linear-gradient(180deg, color-mix(in srgb, var(--text-hi) 6%, transparent), transparent);
  box-shadow: inset 0 1px 0 var(--edge-hi), 0 1px 2px var(--edge-lo);
}

/* chart cards: the title carries a small accent tick */
.chart-head h3 { font-size: 18px; font-weight: 600; letter-spacing: -0.005em; }
.chart-head h3::before {
  content: "";
  display: inline-block;
  width: 6px; height: 6px;
  border-radius: 2px;
  background: var(--accent-400);
  margin: 0 9px 3px 0;
  box-shadow: 0 0 10px var(--glow);
}

/* buttons: glass for the secondary ones, a lit gradient for the primary */
.btn {
  background-image: linear-gradient(180deg, color-mix(in srgb, var(--text-hi) 7%, transparent), transparent);
  box-shadow: inset 0 1px 0 var(--edge-hi), 0 1px 2px var(--edge-lo);
}
.btn-primary {
  background-image: linear-gradient(180deg, var(--accent-300), var(--accent-500));
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.35),
    0 1px 2px var(--edge-lo),
    0 10px 24px -12px var(--accent-400);
}
.btn-primary:hover { background-image: linear-gradient(180deg, var(--accent-200), var(--accent-400)); }
:root[data-theme="light"] .btn-primary { background-image: linear-gradient(180deg, var(--accent-500), var(--accent-300)); }
:root[data-theme="light"] .btn-primary:hover { background-image: linear-gradient(180deg, var(--accent-600), var(--accent-400)); }
.btn.pending { background-image: none; box-shadow: none; }
.wt-btn, .wt-tab[aria-selected="true"], .wt-tab.active {
  background-image: linear-gradient(180deg, color-mix(in srgb, var(--text-hi) 6%, transparent), transparent);
  box-shadow: inset 0 1px 0 var(--edge-hi), 0 1px 2px var(--edge-lo);
}
.wt-btn[aria-pressed="true"], .wt-btn.active {
  background-image: linear-gradient(180deg, var(--accent-300), var(--accent-500));
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.35), 0 1px 2px var(--edge-lo);
}

/* nav: a gradient hairline and a soft drop when stuck */
.nav.stuck {
  box-shadow: 0 10px 30px -22px rgba(0, 0, 0, 0.8);
  border-bottom-color: transparent;
}
.nav.stuck::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -1px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--hairline-strong) 30%, var(--hairline-strong) 70%, transparent);
}

/* section rhythm: every band opens on a fading hairline and a running index */
main { counter-reset: section; }
main > section { counter-increment: section; }
main > section.band::before,
main > section.band-tight::before {
  content: "";
  position: absolute;
  top: 0; left: 50%;
  width: min(1200px, 92vw);
  height: 1px;
  transform: translateX(-50%);
  background: linear-gradient(90deg, transparent, var(--hairline-cool) 18%, var(--hairline-cool) 82%, transparent);
}
main > section:first-of-type::before { display: none; }
.section-head .eyebrow::after {
  content: counter(section, decimal-leading-zero);
  margin-left: 10px;
  font: 500 11px/1 var(--font-mono);
  letter-spacing: 0.08em;
  color: var(--text-faint);
}
h2.section-title { letter-spacing: -0.022em; font-weight: 600; font-size: clamp(30px, 3.8vw, 42px); }
.section-sub { font-size: 17.5px; line-height: 1.6; }

/* hero: a spotlight behind the title and a soft glow on the name */
.hero h1 .accent { text-shadow: 0 0 46px var(--glow); }
.hero-content { position: relative; }
.hero-content::before {
  content: "";
  position: absolute;
  z-index: -1;
  left: -12%; top: -18%;
  width: 70%; height: 70%;
  background: radial-gradient(closest-side, var(--glow), transparent 72%);
  opacity: 0.6;
  filter: blur(10px);
  pointer-events: none;
}

/* footer opens on the same fading hairline */
footer.site { position: relative; }
footer.site::before {
  content: "";
  position: absolute;
  top: 0; left: 50%;
  width: min(1200px, 92vw);
  height: 1px;
  transform: translateX(-50%);
  background: linear-gradient(90deg, transparent, var(--hairline-strong) 30%, var(--hairline-strong) 70%, transparent);
}

/* --------------------------------------------------------------------------
   18. Reveal-on-scroll (scoped to .js so the page reads without scripts)
   -------------------------------------------------------------------------- */
.js .rise {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.5s cubic-bezier(0.22, 0.68, 0.35, 1), transform 0.5s cubic-bezier(0.22, 0.68, 0.35, 1);
}
.js .rise.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .js .rise { opacity: 1; transform: none; } }

/* --------------------------------------------------------------------------
   19. Responsive
   -------------------------------------------------------------------------- */
@media (max-width: 1080px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  footer.site .cols { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 900px) {
  body { font-size: 16px; }
  .band { padding: 60px 0; }
  .br-lg { display: none; }
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .hero { padding: 88px 0 34px; }
  .hero-split { grid-template-columns: 1fr; gap: 30px; }
  .hero-art { max-width: 420px; margin: 0 auto; width: 100%; }
  .nav-links {
    position: absolute;
    top: 60px; left: 12px; right: 12px;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 10px;
    border-radius: 14px;
    background: var(--surface-3);
    border: 1px solid var(--hairline);
    backdrop-filter: blur(18px);
    box-shadow: var(--shadow);
    display: none;
  }
  .nav-links.open { display: flex; }
  /* in the stacked phone menu the project list expands in place */
  .nav-more ul { position: static; min-width: 0; margin-top: 2px; box-shadow: none; backdrop-filter: none; }
  .nav-toggle { display: grid; }
  .nav-tools { margin-left: auto; }
  .nav-brand { opacity: 1; transform: none; pointer-events: auto; font-size: 16px; }
  /* the full wordmark pushes the nav buttons off a phone screen */
  .brand-suffix { display: none; }
  .nav-brand img { width: 26px; height: 26px; }
  .abstract { padding: 24px 22px; }
  .card { padding: 22px 18px; }
  .chart-card { padding: 20px 14px 16px; }
  .flow { flex-direction: column; gap: 10px; }
  .flow-arrow { transform: rotate(90deg); padding: 2px 0; }
  footer.site .cols { grid-template-columns: 1fr; gap: 24px; }
  .affils { justify-content: flex-start; text-align: left; }
  .byline { text-align: left; }
  .authors { text-align: left; }
}

@media (max-width: 620px) {
  .authors { font-size: 15px; line-height: 1.9; }
  .btn { height: 38px; padding: 0 15px; font-size: 13.5px; }
}

/* Print */
@media print {
  .cosmos, .nav { display: none !important; }
  body { background: #fff; color: #111; }
  .card, .chart-card { border-color: #ccc; background: #fff; box-shadow: none; }
  h1, h2, h3, .accent { color: #111 !important; -webkit-text-fill-color: #111 !important; }
}