/* JUICE project page. Plain CSS, no framework.
   Colour means the modality being generated: --img blue, --txt orange, --joint violet.
   Every colour goes through the tokens below so [data-theme] and prefers-color-scheme both work.
   Widget styles live in widgets.css under .w-<name>. */

/* ------------------------------------------------------------------ fonts (self-hosted, OFL) */
@font-face { font-family: 'Inter'; font-style: normal; font-weight: 100 900; font-display: swap;
  src: url('../fonts/inter-latin-standard-normal.woff2') format('woff2');
  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: 'Inter'; font-style: normal; font-weight: 100 900; font-display: swap;
  src: url('../fonts/inter-latin-ext-standard-normal.woff2') format('woff2');
  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: 'Inter'; font-style: normal; font-weight: 100 900; font-display: swap;
  src: url('../fonts/inter-greek-standard-normal.woff2') format('woff2');
  unicode-range: U+0370-0377, U+037A-037F, U+0384-038A, U+038C, U+038E-03A1, U+03A3-03FF; }
@font-face { font-family: 'Inter'; font-style: italic; font-weight: 100 900; font-display: swap;
  src: url('../fonts/inter-latin-standard-italic.woff2') format('woff2');
  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: 'Inter'; font-style: italic; font-weight: 100 900; font-display: swap;
  src: url('../fonts/inter-latin-ext-standard-italic.woff2') format('woff2');
  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: 'Inter'; font-style: italic; font-weight: 100 900; font-display: swap;
  src: url('../fonts/inter-greek-standard-italic.woff2') format('woff2');
  unicode-range: U+0370-0377, U+037A-037F, U+0384-038A, U+038C, U+038E-03A1, U+03A3-03FF; }

@font-face { font-family: 'JetBrains Mono'; font-style: normal; font-weight: 100 800; font-display: swap;
  src: url('../fonts/jetbrains-mono-latin-wght-normal.woff2') format('woff2');
  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: 'JetBrains Mono'; font-style: normal; font-weight: 100 800; font-display: swap;
  src: url('../fonts/jetbrains-mono-latin-ext-wght-normal.woff2') format('woff2');
  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: 'JetBrains Mono'; font-style: normal; font-weight: 100 800; font-display: swap;
  src: url('../fonts/jetbrains-mono-greek-wght-normal.woff2') format('woff2');
  unicode-range: U+0370-0377, U+037A-037F, U+0384-038A, U+038C, U+038E-03A1, U+03A3-03FF; }
@font-face { font-family: 'JetBrains Mono'; font-style: italic; font-weight: 100 800; font-display: swap;
  src: url('../fonts/jetbrains-mono-latin-wght-italic.woff2') format('woff2');
  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: 'JetBrains Mono'; font-style: italic; font-weight: 100 800; font-display: swap;
  src: url('../fonts/jetbrains-mono-latin-ext-wght-italic.woff2') format('woff2');
  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: 'JetBrains Mono'; font-style: italic; font-weight: 100 800; font-display: swap;
  src: url('../fonts/jetbrains-mono-greek-wght-italic.woff2') format('woff2');
  unicode-range: U+0370-0377, U+037A-037F, U+0384-038A, U+038C, U+038E-03A1, U+03A3-03FF; }

@font-face { font-family: 'Cormorant Garamond'; font-style: normal; font-weight: 500; font-display: swap;
  src: url('../fonts/cormorant-garamond-latin-500-normal.woff2') format('woff2');
  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: 'Cormorant Garamond'; font-style: normal; font-weight: 500; font-display: swap;
  src: url('../fonts/cormorant-garamond-latin-ext-500-normal.woff2') format('woff2');
  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: 'Cormorant Garamond'; font-style: normal; font-weight: 600; font-display: swap;
  src: url('../fonts/cormorant-garamond-latin-600-normal.woff2') format('woff2');
  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: 'Cormorant Garamond'; font-style: normal; font-weight: 600; font-display: swap;
  src: url('../fonts/cormorant-garamond-latin-ext-600-normal.woff2') format('woff2');
  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: 'Cormorant Garamond'; font-style: normal; font-weight: 700; font-display: swap;
  src: url('../fonts/cormorant-garamond-latin-700-normal.woff2') format('woff2');
  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: 'Cormorant Garamond'; font-style: normal; font-weight: 700; font-display: swap;
  src: url('../fonts/cormorant-garamond-latin-ext-700-normal.woff2') format('woff2');
  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; }

/* ------------------------------------------------------------------ tokens */
:root {
  color-scheme: light;
  --font-sans: 'Inter', -apple-system, 'Segoe UI', system-ui, sans-serif;
  --font-display: 'Cormorant Garamond', 'Iowan Old Style', Georgia, serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, monospace;

  --fs-wordmark: clamp(3.6rem, 2.2rem + 5.2vw, 5.6rem);
  --fs-subtitle: clamp(1.45rem, 1.05rem + 1.55vw, 2.3rem);
  --fs-h2: clamp(1.85rem, 1.4rem + 1.4vw, 2.5rem);
  --fs-h3: clamp(1.3rem, 1.15rem + .5vw, 1.55rem);
  --fs-lead: clamp(1.18rem, 1rem + .7vw, 1.5rem);
  --fs-body: 1.0625rem;
  --fs-small: .9rem;
  --fs-xs: .8rem;
  --fs-chip: .7rem;
  --lh-body: 1.75;

  --bg: #FAFAF8;
  --surface: #FFFFFF;
  --surface-2: #F4F5F6;
  --ink: #1A1A1A;
  --text: #2D2D2D;
  --muted: #586069;
  --hairline: rgba(0, 0, 0, .075);
  --hairline-strong: rgba(0, 0, 0, .14);
  --plate: #FFFFFF;
  --plate-img-filter: none;
  --overlay: rgba(12, 12, 14, .9);
  --on-accent: #FFFFFF;

  --img: #0072B2;      --img-tint: rgba(0, 114, 178, .07);
  --txt: #D55E00;      --txt-ink: #A84F00;   --txt-tint: rgba(213, 94, 0, .07);
  --joint: #6F5AA8;    --joint-tint: rgba(111, 90, 168, .08);
  --agree: #009E73;    --agree-ink: #007A5A;
  --warn: #E69F00;
  --bad: #B23A3A;
  --sig: #1F6F8B;
  --dino: #8A5A12;

  --w-page: 1200px;
  --w-wide: 1040px;
  --w-figure: 920px;
  --w-text: 760px;
  --w-tldr: 960px;
  --gutter: 24px;
  --section-gap: clamp(72px, 5vw + 40px, 120px);
  --r-sm: 6px; --r-md: 10px; --r-lg: 16px; --r-xl: 18px; --r-pill: 999px;
  --shadow-1: 0 2px 8px rgba(0, 0, 0, .05);
  --shadow-2: 0 12px 34px rgba(0, 0, 0, .04);
  --shadow-plate: 0 18px 50px rgba(0, 0, 0, .045);
  --focus: 0 0 0 2px var(--bg), 0 0 0 4px var(--img);
  --nav-h: 54px;
}

/* dark tokens: once for "follow the system", once for an explicit choice */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #121212; --surface: #1A1A1A; --surface-2: #1F2124;
    --ink: #ECECEC; --text: #D0D0D0; --muted: #9CA3AF;
    --hairline: rgba(255, 255, 255, .08); --hairline-strong: rgba(255, 255, 255, .17);
    --plate: #F0F0EE; --plate-img-filter: brightness(.94);
    --overlay: rgba(0, 0, 0, .9); --on-accent: #121212;
    --img: #56B4E9;   --img-tint: rgba(86, 180, 233, .10);
    --txt: #F0A35E;   --txt-ink: #F0A35E;  --txt-tint: rgba(240, 163, 94, .10);
    --joint: #B3A5E6; --joint-tint: rgba(179, 165, 230, .11);
    --agree: #3CC8A0; --agree-ink: #3CC8A0; --warn: #E69F00; --bad: #F08080;
    --sig: #5FB3CF;   --dino: #E0A854;
    --shadow-1: 0 2px 8px rgba(0, 0, 0, .3); --shadow-2: 0 12px 34px rgba(0, 0, 0, .3);
    --shadow-plate: 0 18px 50px rgba(0, 0, 0, .35);
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #121212; --surface: #1A1A1A; --surface-2: #1F2124;
  --ink: #ECECEC; --text: #D0D0D0; --muted: #9CA3AF;
  --hairline: rgba(255, 255, 255, .08); --hairline-strong: rgba(255, 255, 255, .17);
  --plate: #F0F0EE; --plate-img-filter: brightness(.94);
  --overlay: rgba(0, 0, 0, .9); --on-accent: #121212;
  --img: #56B4E9;   --img-tint: rgba(86, 180, 233, .10);
  --txt: #F0A35E;   --txt-ink: #F0A35E;  --txt-tint: rgba(240, 163, 94, .10);
  --joint: #B3A5E6; --joint-tint: rgba(179, 165, 230, .11);
  --agree: #3CC8A0; --agree-ink: #3CC8A0; --warn: #E69F00; --bad: #F08080;
  --sig: #5FB3CF;   --dino: #E0A854;
  --shadow-1: 0 2px 8px rgba(0, 0, 0, .3); --shadow-2: 0 12px 34px rgba(0, 0, 0, .3);
  --shadow-plate: 0 18px 50px rgba(0, 0, 0, .35);
}

/* ------------------------------------------------------------------ base */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  font-feature-settings: 'cv11', 'ss01';
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-wrap: break-word;
}
img, svg, video { max-width: 100%; }
img { height: auto; }
h1, h2, h3, h4 { color: var(--ink); margin: 0; }
p { margin: 0; }
a { color: var(--img); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
strong, b { color: var(--ink); font-weight: 650; }
code, pre, kbd { font-family: var(--font-mono); }
sub, sup { line-height: 0; }
[hidden] { display: none !important; }
:focus-visible { outline: none; box-shadow: var(--focus); border-radius: 4px; }
::selection { background: color-mix(in srgb, var(--joint) 26%, transparent); }

.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;
}
.skip {
  position: absolute; left: 12px; top: -48px; z-index: 100;
  padding: 8px 14px; background: var(--ink); color: var(--bg); border-radius: var(--r-sm);
  font-weight: 600; text-decoration: none;
}
.skip:focus { top: 12px; }

/* ------------------------------------------------------------------ sticky bar */
.bar {
  position: fixed; inset: 0 0 auto 0; z-index: 50;
  height: var(--nav-h);
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  -webkit-backdrop-filter: blur(12px) saturate(1.2);
  backdrop-filter: blur(12px) saturate(1.2);
  border-bottom: 1px solid var(--hairline);
  transform: translateY(-101%);
  visibility: hidden;
  transition: transform .24s ease, visibility 0s linear .24s;
}
.bar.is-visible,
.bar:has(:focus-visible) { transform: none; visibility: visible; transition: transform .24s ease, visibility 0s; }  /* keyboard focus never sits in a hidden bar */
.bar__inner {
  max-width: var(--w-page); height: 100%; margin: 0 auto; padding: 0 var(--gutter);
  display: flex; align-items: center; gap: 18px;
}
.bar__brand {
  display: inline-flex; align-items: center; gap: 8px; flex: none;
  color: var(--ink); text-decoration: none;
  font-family: var(--font-display); font-weight: 700; font-size: 1.25rem; letter-spacing: .06em;
}
.bar__brand img { display: block; }
.bar__links {
  list-style: none; margin: 0 auto; padding: 0;
  display: flex; align-items: center; gap: 2px; min-width: 0;
  overflow-x: auto; scrollbar-width: none;
}
.bar__links::-webkit-scrollbar { display: none; }
.bar__links a {
  position: relative; display: block; padding: 6px 11px; white-space: nowrap;
  color: var(--muted); text-decoration: none; font-size: .88rem; font-weight: 500;
  border-radius: var(--r-sm); transition: color .15s;
}
.bar__links a:hover { color: var(--ink); }
.bar__links a.is-active { color: var(--ink); font-weight: 600; }
.bar__links a.is-active::after {
  content: ''; position: absolute; left: 11px; right: 11px; bottom: 1px; height: 2.5px;
  border-radius: 2px; background: var(--accent, var(--joint));
}
.bar__tools { display: flex; align-items: center; gap: 10px; flex: none; }
.bar__progress { position: absolute; left: 0; right: 0; bottom: -1px; height: 2px; overflow: hidden; }
.bar__progress span {
  display: block; height: 100%; transform-origin: 0 50%; transform: scaleX(var(--progress, 0));
  background: linear-gradient(90deg, var(--img), var(--joint) 55%, var(--txt));
}

.theme-toggle {
  display: inline-grid; place-items: center; width: 36px; height: 36px; padding: 0;
  border: 1px solid var(--hairline-strong); border-radius: 50%;
  background: color-mix(in srgb, var(--surface) 80%, transparent);
  color: var(--ink); cursor: pointer;
  transition: transform .15s, background .15s;
}
.theme-toggle:hover { transform: translateY(-1px); background: var(--surface); }
.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; }
}
.theme-toggle--hero { position: absolute; top: 18px; right: 18px; z-index: 2; }
html:not(.js) .theme-toggle { display: none; }
html:not(.js) .promo { display: none; }

/* ------------------------------------------------------------------ buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  height: 42px; padding: 0 17px;
  border: 1px solid var(--hairline-strong); border-radius: var(--r-md);
  background: var(--surface); color: var(--ink);
  font: 600 .93rem/1 var(--font-sans); text-decoration: none; white-space: nowrap;
  cursor: pointer; transition: transform .15s, box-shadow .15s, background .15s;
}
.btn svg { flex: none; }
.btn:hover { transform: translateY(-1px); box-shadow: var(--shadow-1); text-decoration: none; }
.btn--primary { background: var(--ink); border-color: var(--ink); color: var(--bg); }
.btn--mini { height: 32px; padding: 0 12px; font-size: .82rem; border-radius: var(--r-sm); }
.btn--soon, .btn[aria-disabled="true"] {
  background: transparent; color: var(--muted); border: 1px dashed var(--hairline-strong);
  cursor: default; box-shadow: none;
}
.btn--soon:hover { transform: none; box-shadow: none; }
.soon {
  margin-left: 2px; padding: 2px 6px; border-radius: var(--r-pill);
  background: var(--surface-2); color: var(--muted);
  font-size: .62rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase;
}
.btn:not(.btn--soon) .soon { display: none; }

/* ------------------------------------------------------------------ hero */
.hero {
  position: relative; overflow: hidden; isolation: isolate;
  padding: 108px var(--gutter) 72px; text-align: center;
}
.hero__motif {
  position: absolute; z-index: -1; pointer-events: none;
  width: 620px; height: 620px; top: -36px; left: 50%;
  transform: translateX(-50%) rotate(-6deg);
  opacity: .085;
  -webkit-mask-image: radial-gradient(closest-side, #000 55%, transparent);
  mask-image: radial-gradient(closest-side, #000 55%, transparent);
}
.hero__inner { max-width: 1000px; margin: 0 auto; }
.title { display: flex; flex-direction: column; align-items: center; gap: 10px; font-weight: inherit; }
.wordmark {
  font-family: var(--font-display); font-weight: 700; font-size: var(--fs-wordmark);
  line-height: .95; letter-spacing: .085em; margin-right: -.085em; color: var(--ink);
}
.subtitle {
  font-family: var(--font-display); font-weight: 500; font-size: var(--fs-subtitle);
  line-height: 1.15; letter-spacing: -.005em; color: var(--ink); max-width: 25ch;
  text-wrap: balance;
}
/* desktop: the paper's two lines, broken after "Modeling"; phones: balanced natural wrap */
@media (min-width: 769px) { .subtitle { max-width: none; } }
@media (max-width: 768px) { .subtitle .br-wide { display: none; } }
/* U+2020 sits outside Inter's latin subset; a system serif dagger avoids fetching latin-ext (130 KB) */
.dag { font-family: Georgia, 'Times New Roman', serif; font-style: normal; }
.summary {
  max-width: 620px; margin: 22px auto 0;
  color: var(--muted); font-size: 1.06rem; line-height: 1.65;
}
.authors { margin-top: 30px; }
.authors__line {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 2px 22px;
  font-size: 1.03rem; line-height: 1.9; color: var(--text);
}
.author { white-space: nowrap; }
.nobr { white-space: nowrap; }  /* numeric ranges like 1–3B never split at the dash */
.author sup, .marks sup { color: var(--muted); font-size: .68em; margin-left: 1px; }
.marks { margin-top: 8px; font-size: .85rem; color: var(--muted); }

.affils {
  list-style: none; margin: 26px auto 0; padding: 0;
  display: flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: 16px 34px;
}
.affil { display: flex; align-items: flex-start; gap: 4px; }
.affil sup { font-size: .72rem; color: var(--muted); line-height: 1; margin-top: -2px; }
.logo { display: block; height: var(--h, 32px); width: auto; }
.logo--dark { display: none; }
:root[data-theme="dark"] .logo--light { display: none; }
:root[data-theme="dark"] .logo--dark { display: block; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .logo--light { display: none; }
  :root:not([data-theme="light"]) .logo--dark { display: block; }
}

.links { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; margin-top: 34px; }

/* ------------------------------------------------------------------ shared section scaffolding */
main { display: block; }
.section {
  max-width: var(--w-wide); margin: 0 auto;
  padding: var(--section-gap) var(--gutter) 0;
  scroll-margin-top: calc(var(--nav-h) - 40px);
}
.section__head { text-align: center; margin-bottom: 40px; }
.section__head::before {
  /* ornament: line, ring, line */
  content: ''; display: block; width: 72px; height: 8px; margin: 0 auto 44px;
  background:
    radial-gradient(circle at center, transparent 2.2px, var(--hairline-strong) 2.7px, var(--hairline-strong) 3.7px, transparent 4.2px) center / 9px 8px no-repeat,
    linear-gradient(var(--hairline-strong), var(--hairline-strong)) left center / 26px 1px no-repeat,
    linear-gradient(var(--hairline-strong), var(--hairline-strong)) right center / 26px 1px no-repeat;
}
.eyebrow {
  font: 700 .78rem/1 var(--font-sans); letter-spacing: .16em;
  color: var(--accent-ink, var(--accent, var(--muted))); margin-bottom: 12px;
  font-variant-numeric: tabular-nums;
}
.section__head h2 {
  font-family: var(--font-display); font-weight: 600; font-size: var(--fs-h2);
  line-height: 1.12; letter-spacing: -.005em;
}
.section__head h2::after {
  content: ''; display: block; width: 72px; height: 2px; margin: 18px auto 0;
  background: var(--accent, var(--ink)); opacity: .7; border-radius: 2px;
}
.section__head h2, .subhead, .tbox__text, .faq__item summary { text-wrap: balance; }
.section__lead, .table-cap, .fig figcaption, .ts-fallback figcaption { text-wrap: balance; }
.prose p, .note, .table-notes li, .tldr__list li, .limits li, .faq__item p, .ccard__desc { text-wrap: pretty; }
.section__lead {
  max-width: 640px; margin: 20px auto 0;
  color: var(--muted); font-size: 1.08rem; line-height: 1.65;
}
.label {
  font-family: var(--font-display); font-weight: 600; font-size: 2.05rem; line-height: 1.1;
  text-align: center; margin-bottom: 20px;
}
.label::after {
  content: ''; display: block; width: 42px; height: 1.5px; margin: 12px auto 0;
  background: var(--ink); opacity: .75;
}
.subhead {
  font-family: var(--font-display); font-weight: 600; font-size: var(--fs-h3);
  text-align: center; margin: 72px auto 22px; scroll-margin-top: calc(var(--nav-h) + 20px);
}
.subhead--left { text-align: left; margin: 36px 0 12px; }

.prose { max-width: var(--w-text); margin: 0 auto; }
.prose p + p { margin-top: 1.05em; }
.prose i, .section__lead i { font-family: inherit; }
.note {
  margin-top: 22px; padding: 2px 0 2px 14px; border-left: 2px solid var(--hairline-strong);
  color: var(--muted); font-size: var(--fs-small); line-height: 1.6;
}
.moves {
  font-family: var(--font-mono); font-size: .9em; letter-spacing: .12em;
  padding: 1px 6px; border-radius: 5px; background: var(--surface-2); color: var(--ink);
}
.moves u { text-decoration-color: var(--txt); text-decoration-thickness: 2px; text-underline-offset: 3px; }

/* ------------------------------------------------------------------ TL;DR */
.tldr { max-width: calc(var(--w-tldr) + 2 * var(--gutter)); margin: 0 auto; padding: 8px var(--gutter) 0; scroll-margin-top: 80px; }
.tldr__card {
  background: color-mix(in srgb, var(--surface) 70%, var(--surface-2));
  border: 1px solid var(--hairline); border-radius: var(--r-lg);
  padding: 30px 40px 32px;
}
.tldr__hook {
  text-align: center; color: var(--ink);
  font-size: var(--fs-lead); font-weight: 700; line-height: 1.4; letter-spacing: -.01em;
}
.tldr__list { list-style: none; counter-reset: tl; margin: 22px 0 0; padding: 0; }
.tldr__list li {
  counter-increment: tl; position: relative; padding-left: 40px;
  font-size: 1.03rem; line-height: 1.72;
}
.tldr__list li + li { margin-top: 12px; }
.tldr__list li::before {
  content: counter(tl); position: absolute; left: 0; top: .2em;
  width: 24px; height: 24px; border-radius: 50%;
  display: grid; place-items: center;
  font: 700 .74rem/1 var(--font-sans); color: var(--joint);
  background: var(--joint-tint); border: 1px solid color-mix(in srgb, var(--joint) 30%, transparent);
}

/* keyword tooltips */
.kw { position: relative; display: inline; }
.kw__btn {
  font: inherit; color: var(--accent); font-weight: 650; line-height: inherit;
  background: none; border: 0; padding: 0; margin: 0; cursor: help;
  border-bottom: 2px dashed color-mix(in srgb, var(--accent) 60%, transparent);
  border-radius: 0;
}
.kw__btn:focus-visible { border-radius: 3px; }
.tip {
  position: absolute; z-index: 40; left: 50%; bottom: calc(100% + 12px);
  width: min(340px, calc(100vw - 32px));
  transform: translateX(calc(-50% + var(--dx, 0px)));
  padding: 14px 16px; border-radius: var(--r-md);
  background: var(--surface); color: var(--text);
  border: 1px solid var(--hairline); border-top: 2px solid var(--accent);
  box-shadow: 0 14px 40px rgba(0, 0, 0, .14);
  font-size: .88rem; line-height: 1.6; font-weight: 400; text-align: left;
  display: none;
}
.tip::after {
  content: ''; position: absolute; top: 100%; left: calc(50% - var(--dx, 0px)); margin-left: -7px;
  border: 7px solid transparent; border-top-color: var(--surface);
}
.tip--below { bottom: auto; top: calc(100% + 12px); border-top: 1px solid var(--hairline); border-bottom: 2px solid var(--accent); }
.tip--below::after { top: auto; bottom: 100%; border-top-color: transparent; border-bottom-color: var(--surface); }
.kw.is-open .tip { display: block; }
html:not(.js) .kw:hover .tip, html:not(.js) .kw__btn:focus + .tip { display: block; }

/* metric strip */
.metrics {
  list-style: none; margin: 22px auto 0; padding: 0;
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)) minmax(0, 1.55fr); gap: 12px;
}
.metric {
  position: relative; display: flex; flex-direction: column; gap: 3px;
  padding: 18px 18px 15px; border-radius: var(--r-lg);
  background: var(--surface); border: 1px solid var(--hairline);
  box-shadow: inset 0 3px 0 var(--accent);
  overflow: hidden;
}
.metric__value {
  color: var(--ink); font-size: 1.95rem; font-weight: 700; line-height: 1.1;
  font-variant-numeric: tabular-nums; letter-spacing: -.02em; white-space: nowrap;
}
.metric__label {
  margin-top: 4px; color: var(--ink); font-size: var(--fs-chip); font-weight: 700;
  letter-spacing: .09em; text-transform: uppercase;
}
.metric__sub { color: var(--muted); font-size: .8rem; line-height: 1.4; }
.metric--maze .metric__value { color: var(--joint); }
.metric__from { color: var(--muted); font-size: .62em; font-weight: 600; letter-spacing: 0; }
.metric__arrow { color: var(--muted); font-size: .6em; margin: 0 .3em; font-weight: 500; }
.metrics__note {
  margin-top: 14px; text-align: center; color: var(--muted);
  font-size: .86rem; letter-spacing: .02em;
}

/* ------------------------------------------------------------------ figures */
.fig { max-width: var(--w-figure); margin: 36px auto 0; }
.fig--wide { max-width: var(--w-wide); }
.fig--compact { max-width: 780px; }
.plate {
  background: var(--plate); border: 1px solid var(--hairline); border-radius: var(--r-xl);
  padding: 18px; box-shadow: var(--shadow-plate);
}
.plate img { display: block; width: 100%; border-radius: var(--r-sm); filter: var(--plate-img-filter); }
.plate--flush { box-shadow: var(--shadow-2); }
.fig figcaption, .promo figcaption {
  max-width: var(--w-text); margin: 14px auto 0;
  color: var(--muted); font-size: var(--fs-small); line-height: 1.6; text-align: center;
}
.fig figcaption strong { color: var(--text); font-weight: 600; }
[data-zoom] { cursor: zoom-in; }

/* promo video */
.section--media { padding-top: calc(var(--section-gap) * .7); }
.promo { max-width: var(--w-wide); margin: 0 auto; }
.promo__frame {
  position: relative; aspect-ratio: 16 / 9; overflow: hidden;
  border-radius: var(--r-lg); background: var(--surface-2);
  border: 1px solid var(--hairline); box-shadow: var(--shadow-plate);
}
.promo__video { display: block; width: 100%; height: 100%; object-fit: cover; background: var(--surface-2); }
.promo.is-missing { display: none; }
.promo.is-missing + .fig { margin-top: 0; }

/* ------------------------------------------------------------------ contents */
.section--contents .label { margin-bottom: 26px; }
.contents {
  list-style: none; margin: 0; padding: 0;
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px;
}
.ccard {
  display: flex; flex-direction: column; height: 100%;
  padding: 18px 18px 16px; border-radius: var(--r-lg);
  background: color-mix(in srgb, var(--surface) 55%, transparent);
  border: 1px solid var(--hairline); box-shadow: inset 0 3px 0 var(--accent);
  color: var(--text); text-decoration: none;
  transition: transform .18s, background .18s, box-shadow .18s;
}
.ccard:hover {
  transform: translateY(-2px); background: var(--surface); text-decoration: none;
  box-shadow: inset 0 3px 0 var(--accent), var(--shadow-2);
}
.ccard__idx { font: 700 .72rem/1 var(--font-sans); letter-spacing: .12em; color: var(--accent-ink, var(--accent)); }
.ccard__title {
  margin-top: 12px; font-family: var(--font-display); font-weight: 600;
  font-size: 1.2rem; line-height: 1.15; color: var(--ink); text-wrap: balance;  /* every title in two lines at five columns */
}
.ccard__desc { margin-top: 8px; font-size: .85rem; line-height: 1.5; color: var(--muted); }
.ccard__subs {
  display: flex; flex-direction: column; gap: 2px; margin-top: auto; padding-top: 12px;
  border-top: 1px solid var(--hairline); font-size: .74rem; line-height: 1.45; color: var(--text);
}
.ccard__desc { margin-bottom: 14px; }
.contents li { display: flex; }
.contents li > .ccard { flex: 1; }

/* ------------------------------------------------------------------ §02 split */
.split {
  display: grid; grid-template-columns: minmax(0, 400px) minmax(0, 1fr);
  gap: 44px; align-items: start; max-width: var(--w-wide); margin: 0 auto;
}
.split .fig { margin: 0; position: sticky; top: calc(var(--nav-h) + 20px); }
.plate--arch { padding: 14px; }
.facet + .facet { margin-top: 28px; }
.facet h3 {
  display: flex; align-items: baseline; gap: 10px;
  font-family: var(--font-display); font-weight: 600; font-size: var(--fs-h3); line-height: 1.2;
  margin-bottom: 8px;
}
.facet__idx {
  font: 700 .7rem/1 var(--font-sans); letter-spacing: .1em; color: var(--muted);
  padding: 4px 7px; border: 1px solid var(--hairline-strong); border-radius: var(--r-pill);
  transform: translateY(-3px);
}
.facet p { font-size: 1rem; line-height: 1.72; }
.facts { list-style: none; margin: 14px 0 0; padding: 0; font-size: .88rem; line-height: 1.55; }
.facts li { display: grid; grid-template-columns: 64px 1fr; gap: 10px; padding: 7px 0; border-top: 1px solid var(--hairline); }
.facts li:last-child { border-bottom: 1px solid var(--hairline); }
.facts li > span:first-child {
  font-size: .68rem; font-weight: 700; letter-spacing: .09em; text-transform: uppercase;
  color: var(--muted); padding-top: 2px;
}

/* study card (<details>) */
.study {
  max-width: var(--w-figure); margin: 52px auto 0;
  background: var(--surface); border: 1px solid var(--hairline); border-radius: var(--r-lg);
  box-shadow: inset 0 3px 0 var(--accent), var(--shadow-2);
}
.study summary {
  display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 14px;
  padding: 18px 22px; cursor: pointer; list-style: none; border-radius: var(--r-lg);
}
.study summary::-webkit-details-marker { display: none; }
.chip {
  justify-self: start; padding: 4px 9px; border-radius: var(--r-pill);
  background: var(--surface-2); color: var(--muted);
  font: 700 var(--fs-chip)/1.2 var(--font-sans); letter-spacing: .09em; text-transform: uppercase;
  white-space: nowrap;
}
.study__title { font-family: var(--font-display); font-weight: 600; font-size: 1.4rem; line-height: 1.2; color: var(--ink); }
.study__hint { display: inline-flex; align-items: center; gap: 6px; color: var(--muted); font-size: .84rem; white-space: nowrap; }
.study__hint::after {
  content: ''; width: 7px; height: 7px; border-right: 1.6px solid currentColor; border-bottom: 1.6px solid currentColor;
  transform: rotate(45deg) translateY(-2px); transition: transform .2s;
}
.study[open] .study__hint::after { transform: rotate(225deg) translate(-1px, -1px); }
.study .when-open, .study[open] .when-closed { display: none; }
.study[open] .when-open { display: inline; }
.study__body { padding: 0 22px 24px; }
.study__body > p { max-width: var(--w-text); margin: 0 auto; font-size: 1rem; }
.study__body .fig { margin-top: 22px; }

/* ------------------------------------------------------------------ §03 takeaways */
.takeaway { scroll-margin-top: calc(var(--nav-h) + 24px); }
.takeaway + .takeaway { margin-top: 84px; }
.tbox {
  max-width: calc(var(--w-text) + 80px); margin: 0 auto 30px;
  padding: 20px 28px 22px; border-left: 4px solid var(--accent);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  background: color-mix(in srgb, var(--accent) 7%, var(--surface));
  box-shadow: var(--shadow-1);
}
.tbox__label {
  font: 700 var(--fs-chip)/1.3 var(--font-sans); letter-spacing: .1em; text-transform: uppercase;
  color: var(--accent-ink, var(--accent));
}
.tbox__text {
  margin-top: 6px; font-family: var(--font-display); font-weight: 600;
  font-size: clamp(1.45rem, 1.2rem + .8vw, 1.8rem); line-height: 1.2; color: var(--ink);
}

/* ------------------------------------------------------------------ widgets: mount point + fallback */
.widget {
  max-width: var(--w-wide); margin: 40px auto 0;
  scroll-margin-top: calc(var(--nav-h) + 16px);
}
.widget > .widget__fallback { margin-top: 0; }
.widget + .fig { margin-top: 28px; }
.widget + .prose { margin-top: 26px; }
.ts-fallback {
  max-width: 560px; margin: 0 auto;
  padding: 22px 22px 18px; border-radius: var(--r-lg);
  background: var(--surface); border: 1px solid var(--hairline); box-shadow: var(--shadow-2);
}
.ts-fallback svg { display: block; width: 100%; height: auto; overflow: visible; }
.ts-fallback figcaption { margin: 12px auto 0; color: var(--muted); font-size: var(--fs-small); line-height: 1.6; text-align: center; }
.ts-fallback figcaption strong { color: var(--text); font-weight: 600; }
.ts-joint { fill: none; stroke: var(--joint); stroke-width: 3.2; stroke-linecap: round; stroke-linejoin: round; }
.ts-steps circle { fill: var(--surface); stroke: var(--joint); stroke-width: 2; }
.ts-edge { fill: none; stroke-width: 6; stroke-linecap: round; }
.ts-edge--img { stroke: var(--img); }
.ts-edge--txt { stroke: var(--txt); }
.ts-corner { fill: var(--ink); }
.ts-lab { font: 600 12.5px var(--font-sans); }
.ts-lab--img { fill: var(--img); }
.ts-lab--txt { fill: var(--txt-ink); }
.ts-lab--joint { fill: var(--joint); font-style: italic; }
.ts-note { fill: var(--muted); font: 10.5px var(--font-sans); }
.ts-tick { fill: var(--muted); font: 11px var(--font-sans); }
.ts-axis { fill: var(--text); font: 500 12px var(--font-sans); }

/* ------------------------------------------------------------------ tables */
.table-block { max-width: var(--w-wide); margin: 44px auto 0; }
.table-block--narrow { max-width: 760px; }
.table-cap { max-width: var(--w-text); margin: 0 auto 12px; font-size: var(--fs-small); line-height: 1.6; color: var(--muted); text-align: center; }
.table-cap strong { color: var(--ink); }
.table-wrap {
  overflow-x: auto; border: 1px solid var(--hairline); border-radius: var(--r-md);
  background:
    linear-gradient(to right, var(--surface) 30%, transparent) left / 40px 100% no-repeat local,
    linear-gradient(to left, var(--surface) 30%, transparent) right / 40px 100% no-repeat local,
    radial-gradient(farthest-side at 0 50%, rgba(0, 0, 0, .12), transparent) left / 12px 100% no-repeat scroll,
    radial-gradient(farthest-side at 100% 50%, rgba(0, 0, 0, .12), transparent) right / 12px 100% no-repeat scroll,
    var(--surface);
}
.results {
  width: 100%; border-collapse: separate; border-spacing: 0;
  font-size: .86rem; line-height: 1.4; white-space: nowrap;
}
.results td { font-variant-numeric: tabular-nums; }
/* §01 comparison table: text cells that wrap, left-aligned, fixed column widths */
.results--compare { white-space: normal; table-layout: fixed; }
.results--compare th[scope="row"] { width: 24%; }
.results.results--compare td, .results.results--compare thead th { text-align: left; vertical-align: top; }
.results td.td-text { font-variant-numeric: normal; }
.results th, .results td { padding: 8px 12px; text-align: center; border-bottom: 1px solid var(--hairline); }
.results thead th {
  background: var(--surface-2); color: var(--ink); font-weight: 650; font-size: .78rem;
  letter-spacing: .02em; position: sticky; top: 0;
}
.results thead tr.group th[colspan] { border-bottom: 1px solid var(--hairline-strong); }
.results tbody th { text-align: left; font-weight: 500; color: var(--ink); }
.results thead th:first-child { text-align: left; }
.results tbody tr:last-child > * { border-bottom: 0; }
.results tbody th, .results thead th:first-child { position: sticky; left: 0; z-index: 1; }
.results tbody th { background: var(--surface); }
.results tbody tr:hover > * { background: color-mix(in srgb, var(--surface-2) 70%, var(--surface)); }
.results .is-ours > * { background: color-mix(in srgb, var(--img) 8%, var(--surface)); color: var(--ink); }
.results .is-ours > th { font-weight: 650; }
.results .is-coupled > * { background: color-mix(in srgb, var(--joint) 10%, var(--surface)); color: var(--ink); }
.results .is-coupled > th { font-weight: 650; }
.results b { font-weight: 750; color: var(--ink); }
.results sup { font-size: .7em; color: var(--muted); margin-left: 1px; }
.table-notes {
  max-width: var(--w-text); margin: 14px auto 0; padding: 0 0 0 18px;
  color: var(--muted); font-size: .86rem; line-height: 1.6;
}
.table-notes li + li { margin-top: 5px; }

.tag {
  display: inline-block; margin-left: 4px; padding: 2px 7px; border-radius: var(--r-pill);
  font: 700 .66rem/1.3 var(--font-sans); letter-spacing: .05em; vertical-align: 1px;
}
.tag--sig { color: color-mix(in srgb, var(--sig) 80%, var(--ink)); background: color-mix(in srgb, var(--sig) 12%, transparent); }
.tag--dino { color: color-mix(in srgb, var(--dino) 80%, var(--ink)); background: color-mix(in srgb, var(--dino) 13%, transparent); }
th .tag:first-child { margin-left: 0; }

/* ------------------------------------------------------------------ gallery (static HTML from _build/build_gallery.py) */
.gallery { max-width: var(--w-wide); margin: 0 auto; }
.pills {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; margin: 0 auto 24px;
}
.pill {
  min-height: 36px; padding: 6px 16px; border-radius: var(--r-pill);
  border: 1px solid color-mix(in srgb, var(--accent, var(--img)) 35%, transparent);
  background: transparent; color: var(--text);
  font: 500 .88rem/1.2 var(--font-sans); cursor: pointer; white-space: nowrap;
  transition: background .15s, color .15s, border-color .15s;
}
.pill:hover { border-color: var(--accent, var(--img)); color: var(--ink); }
.pill[aria-selected="true"] { background: var(--accent, var(--img)); border-color: var(--accent, var(--img)); color: var(--on-accent); font-weight: 600; }
.pills--sub { margin-bottom: 18px; }
.pills--sub .pill { min-height: 32px; padding: 4px 14px; font-size: .82rem; }
.pill--sig { --accent: var(--sig); }
.pill--dino { --accent: var(--dino); }
html:not(.js) .pills { display: none; }
.gpanel__title {
  font-family: var(--font-display); font-weight: 600; font-size: 1.35rem; text-align: center; margin: 30px 0 14px;
}
.js .gpanel__title { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.gpanel.is-entering { animation: fadein .18s ease; }
@keyframes fadein { from { opacity: 0; } to { opacity: 1; } }
.gcap { max-width: var(--w-text); margin: 18px auto 0; text-align: center; color: var(--muted); font-size: .86rem; line-height: 1.6; }
.gcap strong { color: var(--text); font-weight: 600; }
.vlabel { font: 700 var(--fs-chip)/1 var(--font-sans); letter-spacing: .09em; text-transform: uppercase; margin: 0 0 10px; }
.vlabel--sig { color: var(--sig); }
.vlabel--dino { color: var(--dino); }
.js .vlabel { display: none; }

.sample-img {
  display: block; width: 100%; aspect-ratio: 1; object-fit: cover;
  border-radius: var(--r-md); background: var(--surface-2);
  box-shadow: 0 0 0 1px var(--hairline);
}
.grid-t2i { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 22px 18px; }
.t2i { margin: 0; }
.t2i figcaption {
  margin-top: 9px; font-family: var(--font-mono); font-size: .72rem; line-height: 1.5; color: var(--muted);
}
.grid-cards { display: grid; gap: 16px; }
.grid-cards--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-cards--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid-cards--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.card {
  display: flex; flex-direction: column; gap: 10px; padding: 14px;
  background: var(--surface); border: 1px solid var(--hairline); border-radius: var(--r-lg);
}
.card__meta { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; font-size: .74rem; color: var(--muted); }
.card__meta .chip { font-size: .62rem; }
.card__prompt { color: var(--ink); font-size: .9rem; line-height: 1.5; font-weight: 500; }
.card__know { color: var(--muted); font-size: .8rem; line-height: 1.5; }
.card__know em { font-style: normal; font-weight: 600; color: var(--text); }
.pair { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.pair figure { margin: 0; }
.pair figcaption { margin-top: 6px; text-align: center; }
.pair .tag { margin-left: 0; }
.qa__q { color: var(--ink); font-size: .9rem; line-height: 1.5; font-weight: 600; }
.answers { margin: 0; display: grid; gap: 4px; font-size: .84rem; }
.answers > div { display: grid; grid-template-columns: 74px 1fr; gap: 8px; align-items: baseline; }
.answers dt { margin: 0; }
.answers dt .tag { margin-left: 0; }
.answers dd { margin: 0; font-family: var(--font-mono); font-size: .8rem; line-height: 1.5; color: var(--ink); }
.answers .ref { padding-top: 5px; margin-top: 2px; border-top: 1px dashed var(--hairline-strong); }
.answers .ref dt { font-size: .66rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
.answers .ref dd { color: var(--muted); }
.instr { font-size: .78rem; color: var(--muted); font-style: italic; }
.joint-card { flex-direction: row; align-items: flex-start; gap: 16px; }
.joint-card .sample-img { width: 176px; flex: none; }
.joint-card__text { display: flex; flex-direction: column; gap: 8px; min-width: 0; }
.joint-card__text p { font-family: var(--font-mono); font-size: .74rem; line-height: 1.62; color: var(--text); }

/* ------------------------------------------------------------------ limitations, FAQ */
.section--plain .section__head h2::after { background: var(--muted); opacity: .45; }
.limits { margin: 0 0 18px; padding-left: 20px; }
.limits li + li { margin-top: 6px; }
.faq { max-width: var(--w-text); margin: 0 auto; display: grid; gap: 10px; }
.faq__item {
  background: var(--surface); border: 1px solid var(--hairline); border-radius: var(--r-md);
  transition: box-shadow .15s;
}
.faq__item[open] { box-shadow: var(--shadow-2); }
.faq__item summary {
  position: relative; padding: 16px 52px 16px 20px; cursor: pointer; list-style: none;
  color: var(--ink); font-size: 1.04rem; font-weight: 600; line-height: 1.45; border-radius: var(--r-md);
}
.faq__item summary::-webkit-details-marker { display: none; }
.faq__item summary::before, .faq__item summary::after {
  content: ''; position: absolute; right: 22px; top: 50%; width: 12px; height: 1.6px;
  background: var(--muted); transition: transform .2s;
}
.faq__item summary::after { transform: rotate(90deg); }
.faq__item[open] summary::after { transform: rotate(0deg); }
.faq__body { padding: 0 20px 18px; font-size: .98rem; line-height: 1.72; }

/* ------------------------------------------------------------------ citation, footer */
.cite { max-width: var(--w-text); margin: 0 auto; }
.cite__bar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 8px 8px 8px 18px; background: var(--surface-2);
  border: 1px solid var(--hairline); border-bottom: 0; border-radius: var(--r-md) var(--r-md) 0 0;
}
.cite__lang { font: 700 var(--fs-chip)/1 var(--font-sans); letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }
.copy {
  display: inline-flex; align-items: center; gap: 6px; min-height: 32px; padding: 0 12px;
  border: 1px solid var(--hairline-strong); border-radius: var(--r-sm);
  background: var(--surface); color: var(--ink); font: 600 .8rem/1 var(--font-sans); cursor: pointer;
}
.copy:hover { box-shadow: var(--shadow-1); }
.copy.is-done { color: var(--agree-ink); border-color: color-mix(in srgb, var(--agree) 45%, transparent); }
.cite pre {
  margin: 0; padding: 20px 22px; overflow-x: auto;
  background: color-mix(in srgb, var(--surface-2) 55%, var(--surface));
  border: 1px solid var(--hairline); border-radius: 0 0 var(--r-md) var(--r-md);
  font-size: .8rem; line-height: 1.65; color: var(--ink); white-space: pre;
}
.footer {
  margin-top: var(--section-gap); padding: 40px var(--gutter) 56px;
  border-top: 1px solid var(--hairline); text-align: center;
  color: var(--muted); font-size: .9rem; line-height: 1.7;
}
.footer__mark { display: block; margin: 0 auto 14px; opacity: .9; }
.footer p + p { margin-top: 4px; }
.footer a { color: var(--text); }
.footer__links:not(:has(a:not([hidden]))) { display: none; }
.footer__links a + a::before { content: '·'; margin: 0 10px; color: var(--muted); display: inline-block; }
.footer__credit { font-size: .82rem; }

/* ------------------------------------------------------------------ lightbox */
.lightbox {
  width: 100vw; height: 100vh; max-width: none; max-height: none; margin: 0; padding: 0;
  border: 0; background: var(--overlay); color: #FFFFFF;
  overscroll-behavior: contain;
}
.lightbox::backdrop { background: transparent; }
.lightbox[open] { display: grid; place-items: center; }
.lightbox__fig { margin: 0; display: flex; flex-direction: column; align-items: center; gap: 12px; max-width: 94vw; }
.lightbox__img {
  display: block; max-width: 92vw; max-height: 82vh; width: auto; height: auto;
  border-radius: var(--r-sm); background: #FFFFFF; touch-action: pinch-zoom;
}
.lightbox__img.is-pixel { image-rendering: auto; }
.lightbox__cap { max-width: 760px; padding: 0 16px; font-size: .86rem; line-height: 1.55; color: rgba(255, 255, 255, .78); text-align: center; text-wrap: balance; }
.lightbox__btn {
  position: fixed; display: grid; place-items: center; width: 44px; height: 44px; padding: 0;
  border: 1px solid rgba(255, 255, 255, .22); border-radius: 50%;
  background: rgba(255, 255, 255, .08); color: #FFFFFF; font: 400 1.6rem/1 var(--font-sans); cursor: pointer;
}
.lightbox__btn:hover { background: rgba(255, 255, 255, .16); }
.lightbox__close { top: 16px; right: 16px; }
.lightbox__prev { left: 16px; top: 50%; transform: translateY(-50%); }
.lightbox__next { right: 16px; top: 50%; transform: translateY(-50%); }
.lightbox.is-single .lightbox__prev, .lightbox.is-single .lightbox__next { display: none; }

/* ------------------------------------------------------------------ responsive */
@media (max-width: 1100px) {
  .contents { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .metrics { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .metric--maze { grid-column: 1 / -1; flex-direction: row; flex-wrap: wrap; align-items: baseline; column-gap: 14px; }
  .metric--maze .metric__value { flex-basis: 100%; }
  .metric--maze .metric__label { margin-top: 4px; }
}
@media (max-width: 992px) {
  .bar__tools .btn--mini { display: none; }
  .grid-t2i { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .grid-cards--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid-cards--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .split { grid-template-columns: minmax(0, 1fr); }
  .split .fig { position: static; max-width: 460px; margin: 0 auto; }
  .split__text { max-width: var(--w-text); margin: 0 auto; }
}
@media (max-width: 768px) {
  :root { --gutter: 20px; --nav-h: 52px; }
  .bar__inner { gap: 10px; padding-right: 12px; }
  .bar__brand span { display: none; }
  .bar__links {
    margin: 0; flex: 1; scroll-snap-type: x proximity;
    -webkit-mask-image: linear-gradient(90deg, transparent, #000 14px, #000 calc(100% - 18px), transparent);
    mask-image: linear-gradient(90deg, transparent, #000 14px, #000 calc(100% - 18px), transparent);
  }
  .bar__links li { scroll-snap-align: start; }
  .bar__links a { padding: 6px 9px; font-size: .84rem; }
  .hero { padding-top: 76px; padding-bottom: 52px; }
  .hero__motif { width: 480px; height: 480px; top: -20px; }
  .authors__line { font-size: .96rem; gap: 0 16px; line-height: 1.8; }
  .contents {
    display: flex; overflow-x: auto; scroll-snap-type: x mandatory; gap: 12px;
    margin: 0 calc(-1 * var(--gutter)); padding: 4px var(--gutter) 14px; scroll-padding-inline: var(--gutter);
    scrollbar-width: thin;
  }
  .contents li { flex: 0 0 min(78vw, 300px); scroll-snap-align: start; }
  .tldr__card { padding: 22px 20px 24px; }
  .tldr__list li { padding-left: 34px; }
  .grid-cards--2 { grid-template-columns: minmax(0, 1fr); }
  .pills { flex-wrap: nowrap; justify-content: flex-start; overflow-x: auto; margin-left: calc(-1 * var(--gutter)); margin-right: calc(-1 * var(--gutter)); padding: 2px var(--gutter) 6px; scrollbar-width: none; }
  .pills::-webkit-scrollbar { display: none; }
  .pills--sub { justify-content: center; }
  .study summary { grid-template-columns: 1fr auto; padding: 16px; }
  .study summary .chip { grid-column: 1 / -1; }
  .study__body { padding: 0 16px 18px; }
  .tbox { padding: 16px 18px 18px; }
  .takeaway + .takeaway { margin-top: 64px; }
}
@media (max-width: 576px) {
  :root { --gutter: 16px; --fs-body: 1rem; }
  body { line-height: 1.7; }
  .plate { padding: 10px; border-radius: var(--r-lg); }
  .affils { gap: 14px 22px; max-width: 360px; }
  .affil .logo { height: calc(var(--h, 32px) * .78); }
  .links { display: grid; grid-template-columns: 1fr 1fr; max-width: 360px; margin-left: auto; margin-right: auto; }
  .links .btn { height: 44px; width: 100%; }
  .links:has(.btn[href="#video"][hidden]) .btn[href="#citation"] { grid-column: 1 / -1; }
  .metrics { grid-template-columns: 1fr 1fr; }
  .metric { padding: 14px 14px 12px; }
  .metric__value { font-size: 1.6rem; }
  .grid-t2i { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px 12px; }
  .grid-cards--3, .grid-cards--4 { grid-template-columns: minmax(0, 1fr); }
  .joint-card { flex-direction: column; }
  .joint-card .sample-img { width: 100%; max-width: 260px; }
  .ts-fallback { padding: 14px 10px 12px; }
  .cite pre { font-size: .72rem; padding: 16px; }
  .faq__item summary { font-size: .98rem; }
  .table-notes { padding-left: 16px; }
  /* wide multi-panel figures: keep them legible and let the reader pan */
  .fig--pan .plate { overflow-x: auto; overscroll-behavior-x: contain; scrollbar-width: thin; }
  .fig--pan .plate img { width: 600px; max-width: none; }
  .fig--pan figcaption::after { content: " Swipe to pan, tap to enlarge."; color: var(--muted); font-style: italic; }
}
@media (hover: none) {
  .pill, .copy { min-height: 44px; }
  .bar__links a { padding-top: 10px; padding-bottom: 10px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}
@media print {
  .bar, .theme-toggle, .lightbox, .links, .promo { display: none !important; }
  body { background: #FFFFFF; }
}

/* ------------------------------------------------------------------ subsections, questions, bridges (2026-10-19) */
.sub {
  display: flex; align-items: baseline; gap: 10px;
  font-family: var(--font-display); font-weight: 600; font-size: var(--fs-h3); line-height: 1.2;
  color: var(--ink); margin: 44px 0 12px; scroll-margin-top: calc(var(--nav-h) + 20px); text-wrap: balance;
}
.prose > .sub:first-child { margin-top: 56px; }
.section__head + .prose > .sub:first-child, .takeaway > .prose:first-child > .sub:first-child { margin-top: 8px; }
.sub--gap { margin-top: 64px; }
.sub .facet__idx { flex: none; }
.sub__q { margin-top: 4px; font-size: 1.08rem; color: var(--muted); font-style: italic; }
.sub4 { margin: 30px 0 8px; font-family: var(--font-display); font-weight: 600; font-size: 1.25rem; color: var(--ink); }
.bridge {
  max-width: var(--w-text); margin: 56px auto 0; padding: 14px 18px 14px 44px; position: relative;
  border-radius: var(--r-md); background: color-mix(in srgb, var(--accent, var(--ink)) 6%, var(--surface));
  border: 1px solid var(--hairline); color: var(--text); font-size: .98rem; line-height: 1.6; text-wrap: pretty;
}
.bridge::before {
  content: '→'; position: absolute; left: 17px; top: 13px; font-weight: 700; color: var(--accent-ink, var(--accent, var(--ink)));
}
.tbox--end { margin: 34px auto 0; }
.takeaway > .prose:first-child { margin-bottom: 8px; }
.takeaway .study { margin-top: 26px; margin-bottom: 8px; }
.takeaway .fig, .takeaway .widget { margin-top: 26px; }
.takeaway > .prose + .prose, .takeaway .widget + .prose, .takeaway .fig + .prose { margin-top: 26px; }
.tldr__sec { color: inherit; text-decoration: none; }
.tldr__sec:hover { text-decoration: underline; text-underline-offset: 3px; }
.author a { color: inherit; text-decoration: none; border-bottom: 1px solid color-mix(in srgb, currentColor 30%, transparent); }
.author a:hover { border-bottom-color: currentColor; }
.widget--wide { max-width: var(--w-wide); }