/* ==========================================================================
   TOPS project page — stylesheet
   ========================================================================== */
:root {
  --bg: #f6f7fb;
  --surface: #ffffff;
  --surface-2: #f0f3f9;
  --ink: #0d1324;
  --ink-2: #2f3850;
  --muted: #667085;
  --line: #e3e7ef;
  --line-2: #cfd6e4;

  --blue: #2b5fb4;
  --blue-ink: #1d4a94;
  --blue-soft: #e4edfb;
  --purple: #7c5cd6;
  --purple-soft: #ece6fb;
  --teal: #1e9a82;
  --teal-soft: #dff5ef;
  --amber: #b57a2a;
  --amber-soft: #fbefdc;
  --coral: #e8542a;

  --tau1: #2b5fb4;  /* task 1 */
  --tau2: #7c5cd6;  /* task 2 */
  --tau3: #1e9a82;  /* task 3 */

  --hero-bg: #070b16;
  --hero-ink: #eef2ff;

  --font-sans: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-serif: "Instrument Serif", "Iowan Old Style", "Palatino Linotype", Georgia, serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --radius: 16px;
  --radius-sm: 10px;
  --shadow-sm: 0 1px 2px rgba(13, 19, 36, .05), 0 1px 1px rgba(13, 19, 36, .03);
  --shadow: 0 10px 30px -12px rgba(13, 19, 36, .18), 0 2px 6px rgba(13, 19, 36, .05);
  --maxw: 1180px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, video, canvas, svg { display: block; max-width: 100%; }
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
h1, h2, h3, h4 { margin: 0; line-height: 1.15; letter-spacing: -0.01em; }
p { margin: 0 0 1em; }
code, pre { font-family: var(--font-mono); }
.container { width: min(var(--maxw), 100% - 32px); margin-inline: auto; }
.container.narrow { width: min(860px, 100% - 32px); }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

em.serif { font-family: var(--font-serif); font-style: italic; font-weight: 400; }
.grad-text {
  background: linear-gradient(92deg, #7fb2ff 0%, #c4a7ff 48%, #5fe3cc 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}

/* ----- Nav --------------------------------------------------------------- */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 50;
  height: 64px;
  background: linear-gradient(180deg, rgba(7,11,22,.92) 0%, rgba(7,11,22,.55) 60%, rgba(7,11,22,0) 100%);
  display: flex; align-items: center;
  transition: background .3s ease, box-shadow .3s ease, border-color .3s ease;
  border-bottom: 1px solid transparent;
}
.nav .container { display: flex; align-items: center; gap: 24px; }
.nav-brand { display: flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: .02em; color: var(--hero-ink); font-size: 18px; }
.nav-brand:hover { text-decoration: none; }
.nav-mark { width: 28px; height: 28px; border-radius: 8px; background: conic-gradient(from 210deg, #5aa9ff, #b48cff, #3fd0c0, #5aa9ff); position: relative; }
.nav-mark::after { content: ""; position: absolute; inset: 6px; border-radius: 4px; background: var(--hero-bg); }
.nav-links { display: flex; gap: 4px; margin-left: auto; }
.nav-links a { color: rgba(238, 242, 255, .78); font-weight: 500; font-size: 14px; padding: 8px 12px; border-radius: 999px; }
.nav-links a:hover { background: rgba(255,255,255,.08); text-decoration: none; color: #fff; }
.nav-cta { display: flex; gap: 8px; }
.nav.scrolled { background: rgba(255,255,255,.82); backdrop-filter: saturate(160%) blur(14px); -webkit-backdrop-filter: saturate(160%) blur(14px); border-color: var(--line); box-shadow: 0 1px 0 rgba(13,19,36,.03); }
.nav.scrolled .nav-brand { color: var(--ink); }
.nav.scrolled .nav-mark::after { background: #fff; }
.nav.scrolled .nav-links a { color: var(--ink-2); }
.nav.scrolled .nav-links a:hover { background: var(--surface-2); color: var(--ink); }
.nav.scrolled .btn-ghost { color: var(--ink); border-color: var(--line-2); }
@media (max-width: 900px) { .nav-links { display: none; } }

/* ----- Buttons ----------------------------------------------------------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 16px; border-radius: 999px;
  font-weight: 600; font-size: 14px; line-height: 1;
  border: 1px solid transparent; cursor: pointer; white-space: nowrap;
  transition: transform .15s ease, background .2s ease, border-color .2s ease, box-shadow .2s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn svg { width: 16px; height: 16px; }
.btn-primary { background: #fff; color: var(--hero-bg); }
.btn-primary:hover { box-shadow: 0 8px 24px -8px rgba(255,255,255,.5); }
.btn-ghost { background: rgba(255,255,255,.06); color: var(--hero-ink); border-color: rgba(255,255,255,.18); }
.btn-ghost:hover { background: rgba(255,255,255,.12); }
.btn-light { background: var(--ink); color: #fff; }
.btn-outline { background: #fff; color: var(--ink); border-color: var(--line-2); }
.btn-outline:hover { border-color: var(--ink); }
.btn-sm { padding: 7px 12px; font-size: 13px; }
.btn.disabled, .btn[aria-disabled="true"] { opacity: .55; cursor: not-allowed; }

/* ----- Hero -------------------------------------------------------------- */
.hero {
  position: relative; overflow: hidden;
  min-height: 100vh; min-height: 100svh;
  background: var(--hero-bg); color: var(--hero-ink);
  display: flex; flex-direction: column;
}
#hero-canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.hero-scrim {
  position: absolute; inset: 0; pointer-events: none;
  background:
    linear-gradient(90deg, rgba(7,11,22,.96) 0%, rgba(7,11,22,.86) 34%, rgba(7,11,22,.35) 58%, rgba(7,11,22,0) 78%),
    linear-gradient(180deg, rgba(7,11,22,.5) 0%, rgba(7,11,22,0) 25%, rgba(7,11,22,0) 70%, rgba(7,11,22,.9) 100%);
}
.hero-inner {
  position: relative; z-index: 2;
  padding-top: 112px; padding-bottom: 28px;
  flex: 1; display: flex; flex-direction: column; justify-content: center;
}
.hero-eyebrow {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  font-size: 13px; font-weight: 500; letter-spacing: .04em; text-transform: uppercase;
  color: rgba(238,242,255,.7);
  margin-bottom: 22px;
}
.pill {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 5px 10px; border-radius: 999px;
  border: 1px solid rgba(255,255,255,.18); background: rgba(255,255,255,.06);
  font-size: 12px; font-weight: 600; letter-spacing: .06em; text-transform: uppercase;
}
.pill .dot { width: 6px; height: 6px; border-radius: 50%; background: #5fe3cc; box-shadow: 0 0 10px #5fe3cc; }
.hero h1 {
  font-size: clamp(36px, 4.9vw, 62px); font-weight: 800; letter-spacing: -0.03em; line-height: 1.02;
  max-width: 13ch;
}
.hero h1 .tops { font-family: var(--font-sans); }
.hero h1 em { font-family: var(--font-serif); font-style: italic; font-weight: 400; letter-spacing: 0; font-size: 1.08em; }
.hero-sub {
  margin-top: 22px; max-width: 58ch;
  font-size: clamp(16px, 1.4vw, 19px); line-height: 1.55; color: rgba(238,242,255,.78);
}
.hero-sub strong { color: #fff; font-weight: 600; }
.authors { margin-top: 26px; font-size: 15.5px; color: rgba(238,242,255,.9); line-height: 1.8; max-width: 760px; }
.authors a { color: #fff; }
.authors sup { font-size: .68em; color: rgba(238,242,255,.6); margin-left: 1px; }
.affil { margin-top: 4px; font-size: 14px; color: rgba(238,242,255,.62); }
.affil a { color: rgba(238,242,255,.8); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px; }

.hero-hud {
  position: absolute; right: 24px; top: 92px; z-index: 3;
  display: flex; flex-direction: column; gap: 8px; align-items: flex-end;
}
.hud-card {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 12px 10px 12px; border-radius: 12px;
  background: rgba(10,16,32,.55); border: 1px solid rgba(255,255,255,.1);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  font-size: 12.5px; color: rgba(238,242,255,.85);
}
.hud-card .label { font-weight: 600; color: #fff; }
.hud-card .desc { color: rgba(238,242,255,.65); }
.hud-toggle {
  display: inline-flex; border-radius: 999px; padding: 3px;
  background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.12);
}
.hud-toggle button {
  appearance: none; border: 0; background: transparent; color: rgba(238,242,255,.7);
  font: inherit; font-size: 12px; font-weight: 600; padding: 6px 12px; border-radius: 999px; cursor: pointer;
  transition: background .2s, color .2s;
}
.hud-toggle button.active { background: #fff; color: var(--hero-bg); }
.hud-legend { display: flex; gap: 10px; font-size: 11.5px; color: rgba(238,242,255,.6); }
.hud-legend span { display: inline-flex; align-items: center; gap: 5px; }
.hud-legend i { width: 8px; height: 8px; border-radius: 50%; display: inline-block; }

.hero-stats {
  position: relative; z-index: 2;
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px;
  background: rgba(255,255,255,.08);
  border-top: 1px solid rgba(255,255,255,.1);
}
.stat {
  padding: 22px 26px; background: rgba(7,11,22,.75);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
}
.stat .v { font-size: clamp(26px, 2.6vw, 36px); font-weight: 800; letter-spacing: -0.03em; line-height: 1; color: #fff; }
.stat .v small { font-size: .5em; font-weight: 600; color: rgba(238,242,255,.6); margin-left: 2px; }
.stat .k { margin-top: 8px; font-size: 13px; color: rgba(238,242,255,.68); line-height: 1.4; }
.stat .k b { color: rgba(238,242,255,.9); font-weight: 600; }
.stat .delta { display: inline-block; margin-top: 8px; padding: 2px 8px; border-radius: 999px; background: rgba(95,227,204,.12); color: #7ff0dc; font-size: 12px; font-weight: 600; }

@media (max-width: 960px) {
  .hero-scrim { background: linear-gradient(180deg, rgba(7,11,22,.92) 0%, rgba(7,11,22,.86) 55%, rgba(7,11,22,.6) 100%); }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .hero-hud { display: none; }
  .hero-inner { padding-top: 100px; }
}
@media (max-width: 560px) { .hero-stats { grid-template-columns: 1fr 1fr; } .stat { padding: 16px; } }

/* ----- Sections ---------------------------------------------------------- */
.section { padding: 96px 0; }
.section.alt { background: var(--surface); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section-head { margin-bottom: 40px; }
.section-head:not(.split) h2 { max-width: 24ch; }
.section-head.split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 24px 64px; align-items: start; }
.section-head.split .lede { margin-top: 36px; }
@media (max-width: 900px) { .section-head.split { grid-template-columns: 1fr; gap: 14px; } .section-head.split .lede { margin-top: 0; } }
.kicker {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 12.5px; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; color: var(--blue);
  margin-bottom: 14px;
}
.kicker::before { content: ""; width: 22px; height: 2px; background: currentColor; border-radius: 2px; }
.section h2 { font-size: clamp(30px, 3.6vw, 44px); font-weight: 800; letter-spacing: -0.03em; }
.section h2 em { font-family: var(--font-serif); font-style: italic; font-weight: 400; font-size: 1.08em; }
.lede { margin-top: 16px; font-size: 18px; color: var(--ink-2); line-height: 1.6; }
.prose { color: var(--ink-2); font-size: 16.5px; }
.prose p { margin-bottom: 1.1em; }
.prose strong { color: var(--ink); }
h3 { font-size: 22px; font-weight: 700; letter-spacing: -0.02em; }
h4 { font-size: 16px; font-weight: 700; }

/* reveal on scroll */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .7s cubic-bezier(.2,.7,.2,1), transform .7s cubic-bezier(.2,.7,.2,1); }
.reveal.in { opacity: 1; transform: none; }
.reveal[data-delay="1"] { transition-delay: .08s; } .reveal[data-delay="2"] { transition-delay: .16s; } .reveal[data-delay="3"] { transition-delay: .24s; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; transition: none; } html { scroll-behavior: auto; } }

/* ----- Cards ------------------------------------------------------------- */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px; box-shadow: var(--shadow-sm);
  position: relative; overflow: hidden;
}
.card .num { font-family: var(--font-serif); font-style: italic; font-size: 40px; line-height: 1; color: var(--line-2); position: absolute; top: 18px; right: 22px; }
.card h3 { font-size: 19px; margin-bottom: 10px; padding-right: 40px; }
.card p { color: var(--ink-2); font-size: 15px; margin: 0; }
.card .tag { display: inline-flex; align-items: center; gap: 6px; font-size: 12px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; margin-bottom: 14px; padding: 4px 10px; border-radius: 999px; }
.tag.blue { background: var(--blue-soft); color: var(--blue-ink); }
.tag.purple { background: var(--purple-soft); color: #5b3fb3; }
.tag.teal { background: var(--teal-soft); color: #137562; }
@media (max-width: 900px) { .cards { grid-template-columns: 1fr; } }

/* abstract */
.abstract-grid { display: grid; grid-template-columns: 1.3fr .9fr; gap: 48px; align-items: start; }
.abstract-text { font-size: 16.5px; line-height: 1.7; color: var(--ink-2); columns: 2; column-gap: 56px; }
.abstract-text p { margin: 0 0 1em; }
.abstract-text p:last-child { margin-bottom: 0; }
@media (max-width: 900px) { .abstract-text { columns: 1; } }
.abstract-text strong { color: var(--ink); }
.quote-card {
  background: linear-gradient(160deg, #0d1324, #1a2140);
  color: #eef2ff; border-radius: var(--radius); padding: 30px;
  box-shadow: var(--shadow);
}
.quote-card .q { font-family: var(--font-serif); font-style: italic; font-size: 26px; line-height: 1.3; }
.quote-card .a { margin-top: 18px; font-size: 14.5px; color: rgba(238,242,255,.75); line-height: 1.6; }
.quote-card .a b { color: #fff; }
@media (max-width: 900px) { .abstract-grid { grid-template-columns: 1fr; gap: 28px; } }

/* figure */
.figure { margin: 0; }
.figure .frame {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 14px; box-shadow: var(--shadow-sm);
}
.figure .frame img.fit-900 { max-width: 820px; margin: 0 auto; }
.figure img { width: 100%; height: auto; border-radius: 6px; }
.figure figcaption { margin-top: 14px; font-size: 14px; color: var(--muted); line-height: 1.55; }
.figure figcaption b { color: var(--ink-2); }
.figure.wide .frame { padding: 14px; }

.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; }
@media (max-width: 900px) { .two-col { grid-template-columns: 1fr; gap: 24px; } }

.insight-list { list-style: none; padding: 0; margin: 20px 0 0; display: grid; gap: 14px; }
.insight-list li { display: grid; grid-template-columns: 34px 1fr; gap: 12px; align-items: start; color: var(--ink-2); font-size: 15.5px; }
.insight-list .ic { width: 34px; height: 34px; border-radius: 10px; display: grid; place-items: center; font-weight: 700; font-size: 13px; }
.ic.b { background: var(--blue-soft); color: var(--blue-ink); } .ic.p { background: var(--purple-soft); color: #5b3fb3; } .ic.t { background: var(--teal-soft); color: #137562; }
.insight-list b { color: var(--ink); }

/* ----- Explainers -------------------------------------------------------- */
.explainer {
  background: var(--surface); border: 1px solid var(--line); border-radius: 20px;
  box-shadow: var(--shadow); overflow: hidden;
}
.explainer-head {
  display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  padding: 18px 22px; border-bottom: 1px solid var(--line); background: var(--surface);
}
.explainer-head h3 { font-size: 18px; display: flex; align-items: center; gap: 10px; }
.explainer-head h3 .badge { font-size: 11px; font-weight: 800; letter-spacing: .1em; padding: 4px 8px; border-radius: 6px; background: var(--ink); color: #fff; }
.explainer-head .hint { font-size: 13px; color: var(--muted); }
.explainer-body { position: relative; }
.explainer canvas { width: 100%; height: auto; display: block; }
.explainer-foot { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 14px 18px; align-items: center; padding: 14px 22px 18px; border-top: 1px solid var(--line); background: var(--surface-2); }
.explainer-foot .steps { grid-column: 1; grid-row: 1; }
.explainer-foot .icon-btn { grid-column: 2; grid-row: 1; }
.explainer-foot .step-caption { grid-column: 1 / -1; grid-row: 2; }
.explainer-foot.simple .step-caption { grid-column: 1; grid-row: 1; }
.icon-btn {
  display: inline-grid; place-items: center; width: 38px; height: 38px; border-radius: 50%;
  border: 1px solid var(--line-2); background: #fff; cursor: pointer; color: var(--ink);
  transition: background .15s, border-color .15s;
}
.icon-btn:hover { border-color: var(--ink); }
.icon-btn svg { width: 16px; height: 16px; }

/* step pills for explainer A */
.steps { display: flex; gap: 8px; flex-wrap: wrap; }
.steps button {
  appearance: none; border: 1px solid var(--line-2); background: #fff; color: var(--ink-2);
  padding: 8px 12px; border-radius: 999px; font: inherit; font-size: 13px; font-weight: 600; cursor: pointer;
  display: inline-flex; align-items: center; gap: 8px; transition: background .2s, color .2s, border-color .2s;
}
.steps button .n { width: 20px; height: 20px; border-radius: 50%; display: grid; place-items: center; background: var(--surface-2); font-size: 11px; font-weight: 800; }
.steps button.active { background: var(--ink); color: #fff; border-color: var(--ink); }
.steps button.active .n { background: rgba(255,255,255,.18); }
.step-caption { font-size: 14.5px; color: var(--ink-2); display: block; line-height: 1.55; }
.step-caption b { color: var(--ink); margin-right: 6px; }

/* explainer B layout */
.sched-grid { display: grid; grid-template-columns: 400px 1fr; }
.sched-left { padding: 22px; border-right: 1px solid var(--line); background: var(--surface-2); }
.sched-right { padding: 14px 18px 8px; }
.control { margin-bottom: 18px; }
.control label { display: flex; justify-content: space-between; font-size: 13.5px; font-weight: 600; color: var(--ink-2); margin-bottom: 8px; }
.control label output { font-family: var(--font-mono); font-weight: 500; color: var(--ink); }
input[type="range"] { width: 100%; accent-color: var(--purple); }
.readouts { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 8px; }
.readout { background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; }
.readout .k { font-size: 12px; letter-spacing: .02em; font-weight: 700; color: var(--muted); }
.readout .v { margin-top: 4px; font-family: var(--font-mono); font-size: 18px; font-weight: 600; color: var(--ink); }
.readout .v small { font-size: 12px; color: var(--muted); font-family: var(--font-sans); font-weight: 500; margin-left: 4px; }
.readout.purple .v { color: var(--purple); }
.curve-chart { margin-top: 16px; background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 10px; }
.curve-chart svg { width: 100%; height: auto; }
.legend { display: flex; flex-wrap: wrap; gap: 12px; font-size: 12.5px; color: var(--ink-2); margin-top: 8px; }
.legend span { display: inline-flex; align-items: center; gap: 6px; }
.legend i { width: 18px; height: 0; border-top: 2.5px solid; display: inline-block; }
.legend i.dash { border-top-style: dashed; }
.sched-note { margin-top: 14px; font-size: 13px; color: var(--muted); line-height: 1.55; }
@media (max-width: 960px) { .sched-grid { grid-template-columns: 1fr; } .sched-left { border-right: 0; border-bottom: 1px solid var(--line); } }

/* equations */
.eq-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: 28px; }
.eq-card { min-width: 0; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px 24px; box-shadow: var(--shadow-sm); }
.eq-card h4 { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; }
.eq-card h4 .sw { width: 10px; height: 10px; border-radius: 3px; }
.eq-card .math { margin: 10px 0 10px; overflow-x: auto; padding: 4px 0; font-size: 17px; }
.eq-card p { color: var(--ink-2); font-size: 14.5px; margin: 0; }
@media (max-width: 900px) { .eq-grid { grid-template-columns: 1fr; } }

/* mini table */
.mini-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.mini-table th, .mini-table td { padding: 9px 10px; text-align: right; border-bottom: 1px solid var(--line); font-variant-numeric: tabular-nums; }
.mini-table th:first-child, .mini-table td:first-child { text-align: left; }
.mini-table thead th { font-size: 12px; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); font-weight: 700; border-bottom: 1px solid var(--line-2); }
.mini-table tr.ours td { background: var(--blue-soft); font-weight: 700; color: var(--blue-ink); }
.mini-table tr.ours td:first-child { border-radius: 8px 0 0 8px; }
.mini-table tr.ours td:last-child { border-radius: 0 8px 8px 0; }

/* ----- Results table ----------------------------------------------------- */
.table-wrap { overflow-x: auto; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow-sm); }
.results { width: 100%; border-collapse: separate; border-spacing: 0; font-size: 14.5px; min-width: 820px; }
.results th, .results td { padding: 11px 14px; text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
.results th:first-child, .results td:first-child { text-align: left; }
.results thead th { position: sticky; top: 0; background: var(--surface-2); font-size: 12px; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); font-weight: 700; border-bottom: 1px solid var(--line-2); }
.results thead tr.group th { background: var(--surface); border-bottom: 1px solid var(--line); text-transform: none; letter-spacing: 0; font-size: 13px; color: var(--ink-2); text-align: center; }
.results tbody td { border-bottom: 1px solid var(--line); }
.results tbody tr:hover td { background: #fafbfe; }
.results tbody tr.sep td { border-top: 2px solid var(--line-2); }
.results tbody tr.ours td { background: #f3f7fe; }
.results tbody tr.ours.main td { background: var(--blue-soft); font-weight: 700; color: var(--blue-ink); }
.results td .pm { color: var(--muted); font-size: 12px; margin-left: 2px; font-weight: 400; }
.results td.best { font-weight: 800; color: var(--ink); }
.results tr.ours.main td.best { color: var(--blue-ink); }
.results td.second { text-decoration: underline; text-decoration-color: var(--line-2); text-underline-offset: 3px; }
.results td.lat { color: var(--muted); }
.results td.nfe { color: var(--muted); font-size: 13px; }
.results .m { display: inline; }
.results .m .ty { margin-left: 8px; vertical-align: middle; font-size: 10.5px; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; padding: 2px 6px; border-radius: 5px; background: var(--surface-2); color: var(--muted); }
.table-note { font-size: 13px; color: var(--muted); margin-top: 12px; line-height: 1.55; }

/* ----- pi05 cards -------------------------------------------------------- */
.pi-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.pi-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow-sm); }
.pi-card .t { font-size: 13px; font-weight: 700; letter-spacing: .04em; color: var(--muted); text-transform: uppercase; }
.pi-card .big { margin-top: 8px; display: flex; align-items: baseline; gap: 10px; }
.pi-card .big .v { font-size: 34px; font-weight: 800; letter-spacing: -0.03em; color: var(--blue-ink); font-variant-numeric: tabular-nums; }
.pi-card .big .d { font-size: 13px; font-weight: 700; color: #137562; background: var(--teal-soft); padding: 3px 8px; border-radius: 999px; }
.pi-card .bars { margin-top: 14px; display: grid; gap: 8px; }
.pi-card .bar { display: grid; grid-template-columns: 86px 1fr 52px; align-items: center; gap: 10px; font-size: 12.5px; color: var(--ink-2); }
.pi-card .bar .track { height: 10px; background: var(--surface-2); border-radius: 999px; overflow: hidden; }
.pi-card .bar .fill { height: 100%; width: 0; border-radius: 999px; transition: width 1.2s cubic-bezier(.2,.7,.2,1); }
.pi-card .bar .fill.base { background: #b9c3d6; }
.pi-card .bar .fill.ours { background: var(--blue); }
.pi-card .bar .val { text-align: right; font-variant-numeric: tabular-nums; font-weight: 600; }
.pi-card .unit { font-size: 12px; color: var(--muted); margin-top: 10px; }
@media (max-width: 960px) { .pi-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 540px) { .pi-grid { grid-template-columns: 1fr; } }

.result-grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
@media (max-width: 900px) { .result-grid-2 { grid-template-columns: 1fr; } }

/* ----- Real world -------------------------------------------------------- */
.rw-chart { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 18px 10px; box-shadow: var(--shadow-sm); }
.rw-chart svg { width: 100%; height: auto; }
.rw-chart .chart-top { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 8px; }
.rw-chart .chart-top h4 { font-size: 15px; }
.chart-legend { display: flex; gap: 14px; font-size: 13px; color: var(--ink-2); flex-wrap: wrap; }
.chart-legend span { display: inline-flex; align-items: center; gap: 6px; }
.chart-legend i { width: 12px; height: 12px; border-radius: 3px; display: inline-block; }
.chart-tip { position: absolute; pointer-events: none; background: var(--ink); color: #fff; font-size: 12.5px; padding: 6px 9px; border-radius: 8px; transform: translate(-50%, calc(-100% - 10px)); white-space: nowrap; opacity: 0; transition: opacity .15s; z-index: 5; }
.chart-tip.show { opacity: 1; }
.chart-tip b { font-weight: 700; }
.rw-table { display: none; margin-top: 10px; }
.rw-chart.table-mode svg { display: none; }
.rw-chart.table-mode .rw-table { display: block; }
.rw-summary { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 18px; }
.rw-summary .stat2 { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 20px; box-shadow: var(--shadow-sm); }
.rw-summary .stat2 .v { font-size: 30px; font-weight: 800; letter-spacing: -0.03em; color: var(--ink); }
.rw-summary .stat2 .v.b { color: var(--blue-ink); }
.rw-summary .stat2 .k { font-size: 13px; color: var(--muted); margin-top: 4px; line-height: 1.45; }
@media (max-width: 760px) { .rw-summary { grid-template-columns: 1fr; } }

.setup-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin: 26px 0 32px; }
.setup-card { position: relative; border-radius: var(--radius); overflow: hidden; border: 1px solid var(--line); box-shadow: var(--shadow-sm); background: #000; aspect-ratio: 16 / 10; }
.setup-card img { width: 100%; height: 100%; object-fit: cover; opacity: .95; }
.setup-card .cap { position: absolute; left: 0; right: 0; bottom: 0; padding: 36px 16px 14px; color: #fff; background: linear-gradient(180deg, rgba(0,0,0,0), rgba(0,0,0,.72)); }
.setup-card .cap b { display: block; font-size: 16px; }
.setup-card .cap span { font-size: 12.5px; opacity: .85; }
@media (max-width: 760px) { .setup-grid { grid-template-columns: 1fr; } }

/* video gallery */
.gallery { background: var(--surface); border: 1px solid var(--line); border-radius: 20px; box-shadow: var(--shadow); overflow: hidden; }
.gallery-top { display: flex; align-items: center; justify-content: space-between; gap: 14px; flex-wrap: wrap; padding: 16px 20px; border-bottom: 1px solid var(--line); }
.tabs { display: inline-flex; gap: 4px; background: var(--surface-2); padding: 4px; border-radius: 999px; }
.tabs button { appearance: none; border: 0; background: transparent; padding: 8px 14px; border-radius: 999px; font: inherit; font-size: 13.5px; font-weight: 600; color: var(--ink-2); cursor: pointer; transition: background .2s, color .2s; }
.tabs button.active { background: var(--ink); color: #fff; }
.task-chips { display: flex; gap: 8px; flex-wrap: wrap; padding: 14px 20px 0; }
.task-chips button { appearance: none; border: 1px solid var(--line-2); background: #fff; padding: 7px 12px; border-radius: 999px; font: inherit; font-size: 13px; font-weight: 600; color: var(--ink-2); cursor: pointer; }
.task-chips button.active { border-color: var(--blue); color: var(--blue-ink); background: var(--blue-soft); }
.instr { padding: 14px 20px 0; font-size: 14px; color: var(--muted); display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.instr code { background: var(--surface-2); color: var(--ink); padding: 4px 9px; border-radius: 8px; font-size: 13px; }
.video-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; padding: 16px 20px 20px; }
.vcard { border-radius: 14px; overflow: hidden; border: 1px solid var(--line); background: #0b0f1a; position: relative; }
.vcard video { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; background: #0b0f1a; }
.vcard .meta { display: flex; align-items: center; justify-content: space-between; padding: 10px 12px; background: #fff; font-size: 13.5px; font-weight: 600; color: var(--ink); }
.vcard.ours .meta { background: var(--blue-soft); color: var(--blue-ink); }
.badge { display: inline-flex; align-items: center; gap: 5px; font-size: 11.5px; font-weight: 800; letter-spacing: .06em; text-transform: uppercase; padding: 4px 8px; border-radius: 999px; }
.badge.ok { background: #dcf7ea; color: #0b6b43; }
.badge.fail { background: #fde4e1; color: #a1281b; }
.vcard .ribbon { position: absolute; top: 10px; left: 10px; z-index: 2; }
.gallery-foot { padding: 12px 20px 16px; font-size: 13px; color: var(--muted); border-top: 1px solid var(--line); display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; align-items: center; }
@media (max-width: 860px) { .video-grid { grid-template-columns: 1fr; } }

/* ----- bibtex ------------------------------------------------------------ */
.bib { position: relative; background: #0d1324; color: #dbe4ff; border-radius: var(--radius); padding: 22px 24px; overflow: auto; box-shadow: var(--shadow); }
.bib pre { margin: 0; font-size: 13.5px; line-height: 1.6; }
.bib .copy { position: absolute; top: 14px; right: 14px; }
.bib .copy.btn { background: rgba(255,255,255,.1); color: #fff; border-color: rgba(255,255,255,.18); }

/* ----- footer ------------------------------------------------------------ */
.footer { padding: 48px 0 56px; border-top: 1px solid var(--line); background: var(--surface); }
.footer .row { display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.footer .logo { height: 44px; width: auto; }
.footer p { margin: 0; font-size: 13.5px; color: var(--muted); }
.footer a { color: var(--ink-2); }

/* visitor counter (footer) */
.footer .visits { margin-top: 22px; padding-top: 20px; border-top: 1px solid var(--line); display: flex; align-items: center; gap: 12px 18px; flex-wrap: wrap; }
.visits-lead { display: inline-flex; align-items: center; gap: 10px; font-size: 13px; font-weight: 700; color: var(--ink-2); letter-spacing: .01em; }
.live-dot { position: relative; width: 8px; height: 8px; border-radius: 50%; background: var(--teal); flex: none; }
.live-dot::after { content: ""; position: absolute; inset: -5px; border-radius: 50%; border: 2px solid var(--teal); opacity: 0; animation: ping 2.6s ease-out infinite; }
@keyframes ping { 0% { transform: scale(.45); opacity: .75; } 70%, 100% { transform: scale(1.25); opacity: 0; } }
.chips { display: inline-flex; flex-wrap: wrap; gap: 10px; }
.chip { display: inline-flex; align-items: stretch; height: 26px; border-radius: 7px; overflow: hidden; box-shadow: var(--shadow-sm); }
.chip .lab { display: inline-flex; align-items: center; padding: 0 10px; background: var(--ink); color: #fff; font-size: 11px; font-weight: 800; letter-spacing: .09em; text-transform: uppercase; white-space: nowrap; }
.chip .val { display: inline-flex; align-items: center; justify-content: center; min-width: 46px; padding: 0 10px; background: var(--blue); color: #fff; font-family: var(--font-mono); font-size: 13px; font-weight: 600; font-variant-numeric: tabular-nums; white-space: nowrap; }
.chip img { display: block; height: 26px; width: auto; }
.footer .visits-note { margin-left: auto; font-size: 12.5px; }
.visits.is-off .live-dot { background: var(--line-2); }
.visits.is-off .live-dot::after { display: none; }
@media (max-width: 760px) { .footer .visits-note { margin-left: 0; flex-basis: 100%; } }
@media (prefers-reduced-motion: reduce) { .live-dot::after { animation: none; } }

/* misc */
.notice { display: inline-flex; align-items: center; gap: 8px; font-size: 12.5px; color: var(--muted); }
.notice i { width: 6px; height: 6px; border-radius: 50%; background: var(--amber); display: inline-block; }
.toast { position: fixed; left: 50%; bottom: 28px; transform: translate(-50%, 20px); background: var(--ink); color: #fff; padding: 10px 16px; border-radius: 999px; font-size: 13.5px; opacity: 0; transition: opacity .25s, transform .25s; z-index: 100; pointer-events: none; }
.toast.show { opacity: 1; transform: translate(-50%, 0); }
.katex { font-size: 1.05em; }

section[id], header[id] { scroll-margin-top: 72px; }

.eq-grid > * { min-width: 0; }
.katex-display { margin: 0.4em 0; }
.katex-display > .katex { white-space: normal; }

/* quote band (abstract) */
.quote-band { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr); gap: 32px 56px; align-items: center; margin-top: 32px; padding: 34px 40px; border-radius: var(--radius); background: linear-gradient(160deg, #0d1324, #1a2140); color: #eef2ff; box-shadow: var(--shadow); }
.quote-band .q { font-family: var(--font-serif); font-style: italic; font-size: 27px; line-height: 1.3; }
.quote-band .a { font-size: 15px; color: rgba(238,242,255,.78); line-height: 1.65; }
.quote-band .a b { color: #fff; }
@media (max-width: 900px) { .quote-band { grid-template-columns: 1fr; padding: 26px; } .quote-band .q { font-size: 23px; } }

/* insight cards (motivation) */
.insight-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; margin-top: 36px; }
.insight { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow-sm); }
.insight .ic { width: 36px; height: 36px; border-radius: 10px; display: grid; place-items: center; font-weight: 700; font-size: 14px; margin-bottom: 14px; }
.insight h4 { font-size: 17px; margin-bottom: 8px; }
.insight p { margin: 0; color: var(--ink-2); font-size: 15px; }
@media (max-width: 900px) { .insight-grid { grid-template-columns: 1fr; } }