/* ============================================================
   sarthakgpt.com — Living Research Lab design system
   cream #F4F1E8 / ink #0F0E0B / quant-blue #1B3DFF / green #00B870
   Fraunces (display) / Geist (body) / JetBrains Mono (data)
   ============================================================ */

/* ---------- HERO V3 UTILITIES (Spline frame, kinetic type, tilt cards, agent panel) ---------- */

/* kinetic split-character reveal on the headline */
.kinetic .word { display: inline-block; white-space: nowrap; }
.kinetic .ch {
  display: inline-block;
  opacity: 0;
  transform: translateY(0.6em) rotate(6deg);
  transition: opacity 480ms var(--ease-out), transform 540ms var(--ease-out);
  transition-delay: calc(var(--i, 0) * 22ms);
  will-change: opacity, transform;
}
.kinetic.in .ch { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .kinetic .ch { opacity: 1; transform: none; transition: none; }
}

/* mouse-reactive tilt — set --tx/--ty in JS, drives a tiny perspective transform */
.tilt-card {
  --tx: 0deg;
  --ty: 0deg;
  transform: perspective(900px) rotateX(var(--tx)) rotateY(var(--ty));
  transform-style: preserve-3d;
  transition: transform 280ms var(--ease-out), box-shadow 280ms var(--ease-out);
}

/* the Spline scene lives inside an ink-bordered framed card */
.scene-frame {
  --tx: 0deg;
  --ty: 0deg;
  position: relative;
  border: var(--border);
  border-radius: var(--radius);
  background: linear-gradient(160deg, #F7F4EA 0%, #E5E0CF 100%);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
  transform: perspective(1100px) rotateX(var(--tx)) rotateY(var(--ty));
  transition: transform 320ms var(--ease-out);
  isolation: isolate;
}
.scene-frame .scene-art {
  position: absolute; inset: 0;
}
.scene-frame spline-viewer {
  width: 100%;
  height: 100%;
  display: block;
}
/* CSS-only fallback art — looks great even if Spline never loads. */
.scene-fallback {
  position: absolute; inset: 0;
  display: grid; place-items: center;
  background:
    radial-gradient(closest-side at 50% 45%, rgba(27, 61, 255, 0.18), transparent 65%),
    radial-gradient(closest-side at 65% 70%, rgba(0, 184, 112, 0.12), transparent 60%);
  pointer-events: none;
}
.scene-fallback svg { width: 75%; height: 75%; opacity: 0.78; }
.scene-fallback svg .ring { fill: none; stroke: var(--ink); stroke-width: 0.6; }
.scene-fallback svg .ring.b { stroke: var(--blue); stroke-width: 0.8; }
.scene-fallback svg .ring.g { stroke: var(--green); stroke-width: 0.8; }
.scene-fallback svg .dot { fill: var(--ink); }
.scene-fallback .sphere {
  animation: scene-spin 28s linear infinite;
  transform-origin: 50% 50%;
}
@keyframes scene-spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) {
  .scene-fallback .sphere { animation: none; }
}

/* tiny corner brackets so the frame reads as a "viewfinder" */
.scene-frame::before, .scene-frame::after {
  content: ""; position: absolute; z-index: 2; pointer-events: none;
  width: 28px; height: 28px;
  border-color: rgba(15, 14, 11, 0.4); border-style: solid; border-width: 0;
}
.scene-frame::before { top: 12px; left: 12px; border-top-width: 2px; border-left-width: 2px; }
.scene-frame::after { bottom: 12px; right: 12px; border-bottom-width: 2px; border-right-width: 2px; }

/* "talk to the agent" pill — fades in on frame hover */
.agent-pill {
  position: absolute; z-index: 3;
  bottom: 22px; left: 22px;
  font-family: var(--font-mono); font-size: 12px; font-weight: 700;
  letter-spacing: 0.08em; text-transform: uppercase;
  padding: 10px 16px; border-radius: 999px;
  background: var(--ink); color: var(--cream);
  border: 1.5px solid var(--ink);
  opacity: 0; transform: translateY(6px);
  transition: opacity 220ms var(--ease-out), transform 220ms var(--ease-out), background 160ms var(--ease-out);
  cursor: pointer;
}
@media (hover: hover) and (pointer: fine) {
  .scene-frame:hover .agent-pill { opacity: 1; transform: none; }
  .agent-pill:hover { background: var(--blue); border-color: var(--blue); }
}
@media (hover: none) {
  .agent-pill { opacity: 1; transform: none; }
}
.agent-pill.hidden { opacity: 0; pointer-events: none; transform: translateY(6px); }
.agent-pill .ar { display: inline-block; margin-left: 6px; transition: transform 160ms var(--ease-out); }
.agent-pill:hover .ar { transform: translateX(3px); }

/* the agent panel slides up inside the frame */
.agent-panel {
  position: absolute; z-index: 4;
  inset: 0;
  background: #0E0D0A;
  color: var(--cream);
  display: flex; flex-direction: column;
  transform: translateY(100%);
  transition: transform 360ms var(--ease-drawer);
  font-family: var(--font-mono);
}
.agent-panel.open { transform: none; }
.agent-panel .ap-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 18px;
  border-bottom: 1px solid rgba(244, 241, 232, 0.14);
  font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase;
  color: rgba(244, 241, 232, 0.6);
}
.agent-panel .ap-head .dots { display: inline-flex; gap: 6px; align-items: center; margin-right: 10px; }
.agent-panel .ap-head .dot { width: 9px; height: 9px; border-radius: 50%; }
.agent-panel .ap-head .dot.r { background: var(--red); }
.agent-panel .ap-head .dot.y { background: var(--gold); }
.agent-panel .ap-head .dot.g { background: var(--green); }
.agent-panel .ap-head button {
  background: transparent; border: 1px solid rgba(244, 241, 232, 0.35);
  color: rgba(244, 241, 232, 0.75);
  font-family: inherit; font-size: 10.5px; font-weight: 700; letter-spacing: 0.14em;
  padding: 5px 10px; border-radius: 999px; cursor: pointer;
  transition: background 140ms var(--ease-out), color 140ms var(--ease-out);
}
.agent-panel .ap-head button:hover { background: rgba(244, 241, 232, 0.14); color: var(--cream); }
.agent-panel .ap-body {
  flex: 1; overflow-y: auto;
  padding: 18px;
  font-size: 13.5px; line-height: 1.7;
}
.agent-panel .ap-body .u { color: var(--gold); display: block; margin-top: 12px; }
.agent-panel .ap-body .a { color: #9FE8C8; white-space: pre-wrap; }
.agent-panel .ap-body .sys { color: rgba(244, 241, 232, 0.45); }
.agent-panel .ap-suggest {
  display: flex; flex-wrap: wrap; gap: 6px;
  padding: 0 18px 12px;
}
.agent-panel .ap-suggest button {
  background: transparent;
  border: 1px solid rgba(244, 241, 232, 0.28);
  color: rgba(244, 241, 232, 0.75);
  font-family: inherit; font-size: 11px;
  padding: 5px 11px; border-radius: 999px; cursor: pointer;
  transition: background 140ms var(--ease-out), color 140ms var(--ease-out);
}
.agent-panel .ap-suggest button:hover { background: rgba(244, 241, 232, 0.12); color: var(--cream); }
.agent-panel .ap-input {
  display: flex; align-items: center; gap: 10px;
  padding: 12px 18px 16px;
  border-top: 1px solid rgba(244, 241, 232, 0.14);
}
.agent-panel .ap-input .ps1 { color: var(--green); font-weight: 700; font-size: 13px; }
.agent-panel .ap-input input {
  flex: 1;
  background: transparent; border: none; outline: none;
  color: var(--cream);
  font-family: inherit; font-size: 13.5px;
}
.agent-panel .ap-input input:disabled { opacity: 0.5; }
.agent-panel .ap-input input::placeholder { color: rgba(244, 241, 232, 0.4); }

/* ---------- end HERO V3 UTILITIES ---------- */


:root {
  --cream: #F4F1E8;
  --cream-soft: #EDE9DC;
  --cream-deep: #E5E0CF;
  --card-bg: #FBF9F2;
  --ink: #0F0E0B;
  --ink-60: rgba(15, 14, 11, 0.6);
  --ink-40: rgba(15, 14, 11, 0.4);
  --ink-12: rgba(15, 14, 11, 0.12);
  --blue: #1B3DFF;
  --blue-soft: rgba(27, 61, 255, 0.08);
  --green: #00B870;
  --green-soft: rgba(0, 184, 112, 0.10);
  --red: #E5484D;
  --gold: #C9A227;

  --font-display: "Fraunces", Georgia, serif;
  --font-body: "Geist", "Inter", -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", monospace;

  /* motion system: strong custom curves, never default eases */
  --ease-out: cubic-bezier(0.23, 1, 0.32, 1);
  --ease-in-out: cubic-bezier(0.77, 0, 0.175, 1);
  --ease-drawer: cubic-bezier(0.32, 0.72, 0, 1);

  --radius: 20px;
  --radius-sm: 12px;
  --border: 1.5px solid var(--ink);
  --shadow-hard: 6px 6px 0 var(--ink);
  --shadow-hard-sm: 4px 4px 0 var(--ink);
  --maxw: 1200px;
  --nav-h: 72px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }
html.lenis, html.lenis body { height: auto; }
html.lenis { scroll-behavior: auto; } /* Lenis owns smoothing when active */
.lenis.lenis-smooth { scroll-behavior: auto; }

body {
  background: var(--cream);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* film-grain warmth over everything */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)'/%3E%3C/svg%3E");
}

::selection { background: var(--blue); color: var(--cream); }

a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 28px; }

/* ---------- typography ---------- */

h1, h2, h3, .display {
  font-family: var(--font-display);
  font-weight: 560;
  letter-spacing: -0.02em;
  line-height: 1.04;
}

.h-hero { font-size: clamp(3rem, 8.5vw, 7.2rem); line-height: 1.08; }
.h-giant { font-size: clamp(2.6rem, 6.5vw, 5.2rem); }
.h-section { font-size: clamp(2rem, 4.5vw, 3.4rem); }
.h-card { font-size: clamp(1.4rem, 2.4vw, 2rem); }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--blue);
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.eyebrow::before {
  content: "";
  width: 28px; height: 1.5px;
  background: var(--blue);
  display: inline-block;
}
.eyebrow.green { color: var(--green); }
.eyebrow.green::before { background: var(--green); }

.lede {
  font-size: clamp(1.05rem, 1.6vw, 1.3rem);
  color: var(--ink-60);
  max-width: 56ch;
}

.mono { font-family: var(--font-mono); }
.muted { color: var(--ink-60); }
.accent-blue { color: var(--blue); }
.accent-green { color: var(--green); }
.italic-serif { font-family: var(--font-display); font-style: italic; font-weight: 480; }

/* ---------- nav ---------- */

.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  z-index: 1000;
  display: flex;
  align-items: center;
  background: color-mix(in srgb, var(--cream) 82%, transparent);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--ink-12);
}
.nav .wrap {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 15.5px;
  letter-spacing: -0.01em;
  display: inline-flex;
  align-items: baseline;
}
/* "gpt" reads as the suffix it is: blue, slightly apart */
.nav-logo .gpt { color: var(--blue); }
.nav-logo::after {
  content: "_";
  color: var(--green);
  margin-left: 1px;
  animation: logo-caret 1.15s steps(1) infinite;
}
@media (prefers-reduced-motion: reduce) { .nav-logo::after { animation: none; } }
@keyframes logo-caret { 50% { opacity: 0; } }
.nav-logo .tick {
  color: var(--green);
  display: inline-grid;
  place-items: center;
  cursor: pointer;
  margin: 0 3px;
  padding: 1px 4px 2px;
  border-radius: 6px;
  background: rgba(0, 184, 112, 0.12);
  font-size: 13px;
  line-height: 1;
  transition: transform 200ms var(--ease-out), background 200ms var(--ease-out), color 200ms var(--ease-out);
  animation: tick-nudge 7s var(--ease-out) infinite;
}
/* an occasional up-tick, because every chart needs one */
@keyframes tick-nudge {
  0%, 90%, 100% { transform: none; }
  92% { transform: translateY(-3px); }
  94% { transform: none; }
  96% { transform: translateY(-1.5px); }
  98% { transform: none; }
}
@media (prefers-reduced-motion: reduce) { .nav-logo .tick { animation: none; } }
@media (hover: hover) and (pointer: fine) {
  .nav-logo .tick:hover {
    background: var(--green);
    color: var(--cream);
    transform: translateY(-3px) scale(1.12);
    animation: none;
  }
}

/* ---------- the ▲ easter egg: Random Walk overlay ---------- */

.game-overlay {
  position: fixed;
  inset: 0;
  z-index: 5000;
  background: rgba(15, 14, 11, 0.55);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 1;
  transition: opacity 200ms var(--ease-out);
}
.game-overlay[data-closing] { opacity: 0; }
.game-overlay .game-box {
  background: var(--cream);
  border: var(--border);
  border-radius: var(--radius);
  box-shadow: 10px 10px 0 var(--ink);
  width: min(1060px, 96vw);
  padding: 18px;
  transform: scale(1);
  transition: transform 240ms var(--ease-drawer);
}
.game-overlay[data-opening] .game-box { transform: scale(0.96); }
.game-overlay .game-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-60);
  padding: 2px 6px 12px;
}
.game-overlay .game-close {
  border: 1.5px solid var(--ink);
  background: var(--cream);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  padding: 6px 14px;
  transition: transform 140ms var(--ease-out), background 140ms var(--ease-out), color 140ms var(--ease-out);
}
@media (hover: hover) and (pointer: fine) {
  .game-overlay .game-close:hover { background: var(--ink); color: var(--cream); }
}
.game-overlay .game-close:active { transform: scale(0.95); }
.game-overlay canvas { width: 100%; display: block; border: 1.5px solid var(--ink-12); border-radius: 12px; background: var(--cream); }
@media (max-width: 500px) {
  .game-overlay .game-box { padding: 12px; max-height: 90dvh; overflow-y: auto; }
}
.nav-links { display: flex; gap: 6px; align-items: center; }
.nav-links a {
  font-family: var(--font-mono);
  font-size: 13px;
  padding: 8px 14px;
  border-radius: 999px;
  transition: background 150ms var(--ease-out), color 150ms var(--ease-out), transform 150ms var(--ease-out);
}
.nav-links a:active { transform: scale(0.96); }
@media (hover: hover) and (pointer: fine) {
  .nav-links a:hover { background: var(--ink); color: var(--cream); }
}
.nav-links a.active { background: var(--ink); color: var(--cream); }
.nav-links a.cta {
  border: var(--border);
  background: var(--blue);
  color: #fff;
  border-color: var(--blue);
}
@media (hover: hover) and (pointer: fine) {
  .nav-links a.cta:hover { background: var(--ink); border-color: var(--ink); }
}

@media (max-width: 720px) {
  .nav-links a { padding: 7px 9px; font-size: 11.5px; }
  .wrap { padding: 0 18px; }
}
@media (max-width: 375px) {
  .nav-links a { font-size: 10px; padding: 6px 8px; }
  .btn { font-size: 12px; padding: 11px 18px; min-height: 44px; }
}

/* ---------- buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  padding: 14px 26px;
  border-radius: 999px;
  border: var(--border);
  background: var(--ink);
  color: var(--cream);
  transition: transform 160ms var(--ease-out), box-shadow 160ms var(--ease-out);
}
@media (hover: hover) and (pointer: fine) {
  .btn:hover { transform: translate(-2px, -2px); box-shadow: var(--shadow-hard-sm); }
}
.btn:active { transform: scale(0.97); box-shadow: none; }
.btn.blue { background: var(--blue); border-color: var(--blue); color: #fff; }
.btn.ghost { background: transparent; color: var(--ink); }

/* ---------- cards ---------- */

.card {
  background: var(--card-bg);
  border: var(--border);
  border-radius: var(--radius);
  padding: 32px;
  position: relative;
}
.card.pop { box-shadow: var(--shadow-hard); }
.card.hover-lift { transition: transform 200ms var(--ease-out), box-shadow 200ms var(--ease-out); }
@media (hover: hover) and (pointer: fine) {
  .card.hover-lift:hover { transform: translate(-3px, -3px); box-shadow: var(--shadow-hard); }
}
.card.hover-lift:active { transform: scale(0.99); }

.chip {
  display: inline-block;
  align-self: flex-start;
  width: fit-content;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 5px 12px;
  border: 1.5px solid var(--ink);
  border-radius: 999px;
  background: var(--cream);
}
.chip.blue { background: var(--blue); color: #fff; border-color: var(--blue); }
.chip.green { background: var(--green); color: #fff; border-color: var(--green); }

/* ---------- market ribbon ---------- */

.ribbon {
  border-top: var(--border);
  border-bottom: var(--border);
  background: var(--ink);
  color: var(--cream);
  overflow: hidden;
  white-space: nowrap;
  font-family: var(--font-mono);
  font-size: 13px;
  padding: 10px 0;
  position: relative;
}
.ribbon-track {
  display: inline-block;
  animation: ribbon-scroll 42s linear infinite;
}
.ribbon:hover .ribbon-track { animation-play-state: paused; }
.ribbon-item { display: inline-block; padding: 0 26px; }
.ribbon-item .sym { font-weight: 700; }
.ribbon-item .up { color: #2EE59D; }
.ribbon-item .down { color: #FF7A7E; }
.ribbon-item .tag { opacity: 0.45; font-size: 10px; margin-left: 6px; }
@keyframes ribbon-scroll {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

/* ---------- footer ---------- */

.footer {
  border-top: var(--border);
  margin-top: 120px;
  padding: 64px 0 40px;
  background: var(--cream-soft);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 40px;
}
@media (max-width: 720px) { .footer-grid { grid-template-columns: 1fr; } }
.footer h4 {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-40);
  margin-bottom: 16px;
}
.footer a { display: block; padding: 4px 0; color: var(--ink-60); transition: color 150ms var(--ease-out); font-size: 15px; }
@media (hover: hover) and (pointer: fine) {
  .footer a:hover { color: var(--blue); }
}
.footer-bottom {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--ink-12);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-40);
}

/* ---------- shared section rhythm ---------- */

.section { padding: 110px 0; }
.section-head { margin-bottom: 56px; display: flex; flex-direction: column; gap: 18px; }

/* ---------- stat blocks ---------- */

.stat-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 18px;
}
@media (max-width: 520px) { .stat-row { grid-template-columns: 1fr; } }
.stat {
  border: var(--border);
  border-radius: var(--radius-sm);
  padding: 24px;
  background: var(--card-bg);
}
.stat .num {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 4vw, 3.2rem);
  font-weight: 580;
  letter-spacing: -0.02em;
  line-height: 1;
}
.stat .lbl {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-60);
  margin-top: 10px;
}

/* ---------- reveal-on-scroll ---------- */

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 320ms var(--ease-out), transform 320ms var(--ease-out);
}
.reveal.in { opacity: 1; transform: none; }
/* siblings cascade: 40ms stagger, capped */
.reveal.in:nth-child(2) { transition-delay: 40ms; }
.reveal.in:nth-child(3) { transition-delay: 80ms; }
.reveal.in:nth-child(4) { transition-delay: 120ms; }
.reveal.in:nth-child(5) { transition-delay: 160ms; }

/* ---------- page-load entrance (hero only, one-shot) ---------- */

@keyframes rise-in {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: none; }
}
.rise { opacity: 0; animation: rise-in 600ms var(--ease-out) forwards; }
.rise.d1 { animation-delay: 60ms; }
.rise.d2 { animation-delay: 120ms; }
.rise.d3 { animation-delay: 180ms; }
.rise.d4 { animation-delay: 240ms; }
.rise.d5 { animation-delay: 300ms; }

/* ---------- cross-page transitions ---------- */

@view-transition { navigation: auto; }
::view-transition-old(root) { animation-duration: 160ms; }
::view-transition-new(root) { animation-duration: 200ms; }

/* ---------- spotlight cards (mouse-tracked glow) ---------- */

.spotlight { position: relative; overflow: hidden; }
.spotlight::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  opacity: 0;
  transition: opacity 300ms var(--ease-out);
  pointer-events: none;
  background: radial-gradient(
    340px circle at var(--mx, 50%) var(--my, 50%),
    rgba(27, 61, 255, 0.10),
    rgba(0, 184, 112, 0.04) 45%,
    transparent 70%
  );
}
@media (hover: hover) and (pointer: fine) {
  .spotlight:hover::after { opacity: 1; }
}

/* ---------- border beam (gradient orbiting the card edge) ---------- */

@property --beam-angle {
  syntax: "<angle>";
  initial-value: 0deg;
  inherits: false;
}
.beam { position: relative; }
.beam::before {
  content: "";
  position: absolute;
  inset: -1.5px;
  border-radius: inherit;
  padding: 2px;
  background: conic-gradient(
    from var(--beam-angle),
    transparent 0 72%,
    var(--blue) 82%,
    var(--green) 92%,
    transparent 100%
  );
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask-composite: exclude;
  animation: beam-spin 5s linear infinite;
  pointer-events: none;
}
@keyframes beam-spin { to { --beam-angle: 360deg; } }
@media (prefers-reduced-motion: reduce) { .beam::before { animation: none; } }

/* ---------- stat sparklines ---------- */

.stat { display: flex; flex-direction: column; }
.stat .spark { width: 100%; height: 36px; margin-top: 14px; display: block; }

/* ---------- giant CTA ---------- */

.cta-giant .display { display: block; transition: color 200ms var(--ease-out), transform 200ms var(--ease-out); }
@media (hover: hover) and (pointer: fine) {
  .cta-giant:hover .display { color: var(--blue); transform: translateY(-4px); }
}
.cta-giant:active .display { transform: scale(0.99); }

/* ---------- focus visibility ---------- */

:focus-visible {
  outline: 2.5px solid var(--blue);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ---------- marquee divider (big serif) ---------- */

.marquee {
  overflow: hidden;
  border-top: var(--border);
  border-bottom: var(--border);
  padding: 18px 0;
  white-space: nowrap;
}
.marquee-track {
  display: inline-block;
  animation: ribbon-scroll 30s linear infinite;
  font-family: var(--font-display);
  font-style: italic;
  font-size: clamp(1.4rem, 3vw, 2.2rem);
  color: var(--ink-60);
}
.marquee-track span { padding: 0 30px; }
.marquee-track .dot { color: var(--blue); font-style: normal; }

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  .ribbon-track, .marquee-track { animation: none; }
  .ribbon { overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .reveal { opacity: 1; transform: none; transition: opacity 160ms var(--ease-out); }
  .rise { animation: none; opacity: 1; }
  html { scroll-behavior: auto; }
}

/* ---------- footer contact icons ---------- */
.foot-icons { display: inline-flex; gap: 10px; align-items: center; }
.foot-icons a {
  width: 34px; height: 34px; border: 1.5px solid var(--ink-40); border-radius: 50%;
  display: grid; place-items: center; color: var(--ink-60);
  transition: color 160ms var(--ease-out), border-color 160ms var(--ease-out), transform 160ms var(--ease-out), background 160ms var(--ease-out);
}
.foot-icons a svg { width: 16px; height: 16px; }
@media (hover: hover) and (pointer: fine) {
  .foot-icons a:hover { background: var(--blue); border-color: var(--blue); color: #fff; transform: translateY(-2px); }
}

/* ---------- the skgpt nav pill: live agent, quietly advertised ---------- */
.nav-links a.skgpt-link {
  background: rgba(0, 184, 112, 0.12);
  border-radius: 999px;
  padding: 7px 14px;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  transition: background 160ms var(--ease-out);
}
.nav-links a.skgpt-link::before {
  content: "";
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--green);
  animation: skgpt-pulse 1.8s ease infinite;
}
@keyframes skgpt-pulse { 50% { opacity: 0.3; } }
@media (prefers-reduced-motion: reduce) { .nav-links a.skgpt-link::before { animation: none; } }
@media (hover: hover) and (pointer: fine) {
  .nav-links a.skgpt-link:hover { background: rgba(0, 184, 112, 0.25); }
}

/* ============================================================
   THEMES — light (default) / dark / terminal
   ============================================================ */

[data-theme="dark"] {
  --cream: #131210;
  --cream-soft: #1A1916;
  --cream-deep: #221F1A;
  --card-bg: #1E1C18;
  --ink: #F2EFE6;
  --ink-60: rgba(242, 239, 230, 0.65);
  --ink-40: rgba(242, 239, 230, 0.45);
  --ink-12: rgba(242, 239, 230, 0.15);
  --blue: #6B82FF;
  --blue-soft: rgba(107, 130, 255, 0.12);
  --green: #19D88A;
  --green-soft: rgba(25, 216, 138, 0.12);
  --red: #FF6B6F;
  --gold: #E0B94A;
}

[data-theme="terminal"] {
  --cream: #050A06;
  --cream-soft: #081008;
  --cream-deep: #0B140B;
  --card-bg: #0C1A0E;
  --ink: #33FF66;
  --ink-60: rgba(51, 255, 102, 0.72);
  --ink-40: rgba(51, 255, 102, 0.5);
  --ink-12: rgba(51, 255, 102, 0.18);
  --blue: #33FF66;
  --blue-soft: rgba(51, 255, 102, 0.1);
  --green: #33FF66;
  --green-soft: rgba(51, 255, 102, 0.12);
  --red: #FF5544;
  --gold: #FFB000;
  --font-display: "JetBrains Mono", "SF Mono", monospace;
  --font-body: "JetBrains Mono", "SF Mono", monospace;
}
[data-theme="terminal"] h1, [data-theme="terminal"] h2, [data-theme="terminal"] h3,
[data-theme="terminal"] .h-mega, [data-theme="terminal"] .h-giant, [data-theme="terminal"] .h-hero {
  text-shadow: 0 0 12px rgba(51, 255, 102, 0.35);
}
[data-theme="terminal"] body::after {
  content: ""; position: fixed; inset: 0; pointer-events: none; z-index: 9990;
  background: repeating-linear-gradient(0deg, rgba(0, 0, 0, 0.25) 0 1px, transparent 1px 3px);
}

/* shared dark-ish fixes: paper canvases, ink consoles stay ink, art keeps its paper */
[data-theme="dark"] canvas, [data-theme="terminal"] canvas {
  background: #F4F1E8 !important;
}
[data-theme="dark"] .panel, [data-theme="dark"] .build-card, [data-theme="dark"] .door,
[data-theme="terminal"] .panel, [data-theme="terminal"] .build-card, [data-theme="terminal"] .door {
  background: var(--cream-soft);
}
/* consoles, terminals, and any "always-dark" surface re-scope their palette back so
   built-for-dark components stay legible in every theme. add a class to this list,
   or set [data-always-dark] on any new surface, and the cascade does the rest. */
[data-theme="dark"] .terminal,
[data-theme="dark"] .agent-console,
[data-theme="dark"] .ask-term,
[data-theme="dark"] .ribbon,
[data-theme="dark"] .panel-bar,
[data-theme="dark"] .mode-tabs,
[data-theme="dark"] .mode-tab,
[data-theme="dark"] .builder,
[data-theme="dark"] .chat-running,
[data-theme="dark"] .book-feature,
[data-theme="dark"] #credit,
[data-theme="dark"] [data-always-dark],
[data-theme="terminal"] .terminal,
[data-theme="terminal"] .agent-console,
[data-theme="terminal"] .ask-term,
[data-theme="terminal"] .ribbon,
[data-theme="terminal"] .panel-bar,
[data-theme="terminal"] .mode-tabs,
[data-theme="terminal"] .mode-tab,
[data-theme="terminal"] .builder,
[data-theme="terminal"] .chat-running,
[data-theme="terminal"] .book-feature,
[data-theme="terminal"] #credit,
[data-theme="terminal"] [data-always-dark] {
  --ink: #0F0E0B;
  --cream: #F4F1E8;
  --green: #00B870;
  --gold: #C9A227;
  --red: #E5484D;
  --ink-60: rgba(244, 241, 232, 0.70);
  --ink-40: rgba(244, 241, 232, 0.50);
  --ink-12: rgba(244, 241, 232, 0.18);
  background: #14130F;
  color: #F4F1E8;
}
[data-theme="dark"] .panel-bar, [data-theme="terminal"] .panel-bar { background: #0F0E0B; }
[data-theme="dark"] #creed, [data-theme="terminal"] #creed {
  --ink: #0F0E0B; --cream: #F4F1E8; --green: #00B870;
  background: #0F0E0B;
}
/* the transparent ink portrait on dark themes:
   dark mode keeps the original art and floats it on a soft paper halo
   (a feathered radial spotlight, so ink stays ink and skin stays light);
   terminal mode keeps the phosphor negative, which earns its keep. */
[data-theme="dark"] .cover-wrap { position: relative; }
[data-theme="dark"] .cover-wrap::before {
  content: ""; position: absolute; inset: -6%;
  background: radial-gradient(closest-side,
    #F4F1E8 52%,
    rgba(244, 241, 232, 0.9) 64%,
    rgba(244, 241, 232, 0.45) 74%,
    transparent 84%);
  z-index: 0;
}
[data-theme="dark"] .cover-wrap img { position: relative; z-index: 1; }
[data-theme="terminal"] .cover-wrap { position: relative; }
[data-theme="terminal"] .cover-wrap::before {
  content: ""; position: absolute; inset: -6%;
  background: radial-gradient(closest-side,
    #F4F1E8 50%,
    rgba(228, 244, 230, 0.88) 62%,
    rgba(51, 255, 102, 0.20) 74%,
    transparent 87%);
  z-index: 0;
}
[data-theme="terminal"] .cover-wrap img {
  position: relative; z-index: 1;
  filter: saturate(0.85);
}

/* theme switcher: 3-segment bar, all modes always visible */
.theme-switch {
  display: inline-flex;
  border: 1.5px solid var(--ink-40);
  border-radius: 999px;
  padding: 3px;
  background: color-mix(in srgb, var(--cream) 70%, transparent);
  gap: 2px;
  isolation: isolate;
}
.theme-switch button {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--font-mono); font-size: 12px; font-weight: 700;
  letter-spacing: 0.04em;
  border: none; background: transparent; color: var(--ink-60);
  padding: 5px 10px; border-radius: 999px; cursor: pointer;
  transition: color 160ms var(--ease-out), background 160ms var(--ease-out), transform 160ms var(--ease-out);
}
.theme-switch button .ts-ic { font-size: 13px; line-height: 1; }
.theme-switch button.active {
  background: var(--ink);
  color: var(--cream);
}
.theme-switch button:active { transform: scale(0.94); }
@media (hover: hover) and (pointer: fine) {
  .theme-switch button:not(.active):hover { color: var(--ink); background: var(--blue-soft); }
}

/* ---------- compact nav on mobile: everything fits, toggle included ---------- */
@media (max-width: 720px) {
  .nav-links { gap: 3px; overflow-x: auto; -webkit-overflow-scrolling: touch; scrollbar-width: none; max-width: calc(100vw - 130px); }
  .nav-links::-webkit-scrollbar { display: none; }
  .nav-links a[href="index.html"] { display: none; }   /* the logo is Home */
  .nav-links .cta { font-size: 0; padding: 9px 10px; }
  .nav-links .cta svg { margin-right: 0 !important; width: 15px; height: 15px; }
  .theme-toggle { padding: 6px 9px; font-size: 12px; }
  .nav-links a.skgpt-link { padding: 6px 10px; }
}

/* nav-right: theme switch + LinkedIn pinned outside the scrollable links */
.nav-right { display: flex; align-items: center; gap: 14px; flex-shrink: 0; margin-left: 18px; }
.nav-right .theme-switch { margin-right: 4px; }
@media (max-width: 720px) {
  .nav-links { flex: 1; max-width: none; justify-content: flex-start; }
  .nav-right .cta { font-size: 0; padding: 9px 10px; }
  .nav-right .cta svg { margin-right: 0 !important; }
}
/* on the mobile top bar the switch becomes icon-only and compact */
@media (max-width: 720px) {
  .nav-right .theme-switch { padding: 2px; }
  .nav-right .theme-switch button { padding: 4px 7px; font-size: 12px; }
  .nav-right .theme-switch button .ts-lb { display: none; }
  .nav-right .theme-switch button .ts-ic { font-size: 13px; }
}

/* ============================================================
   MOBILE APP LAYOUT — top bar is the wordmark, menus live in a
   fixed bottom tab bar with the theme switch. Desktop unchanged.
   ============================================================ */
.tabbar { display: none; }
@media (max-width: 720px) {
  .nav-links { display: none; }
  .nav-right .cta { display: none; }
  .nav .wrap { justify-content: space-between; }
  .nav-right { margin-left: 0; }
  .theme-toggle { padding: 8px 13px; font-size: 14px; }
  .tabbar {
    position: fixed; bottom: 0; left: 0; right: 0; z-index: 1200;
    display: flex; justify-content: space-around; align-items: stretch;
    background: color-mix(in srgb, var(--cream) 92%, transparent);
    backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
    border-top: 1px solid var(--ink-12);
    padding: 10px 6px calc(10px + env(safe-area-inset-bottom));
  }
  .tabbar a, .tabbar button {
    display: flex; flex-direction: column; align-items: center; gap: 5px;
    font-family: var(--font-mono); font-size: 10.5px; font-weight: 700;
    letter-spacing: 0.05em; text-transform: uppercase;
    color: var(--ink-60); background: none; border: none;
    padding: 7px 12px; border-radius: 12px; min-width: 56px; cursor: pointer;
  }
  .tabbar .ic { font-size: 22px; line-height: 1; }
  .tabbar .tb-active { color: var(--ink); background: var(--blue-soft); }
  .tabbar .tb-active .ic { transform: translateY(-1px); }
  .tabbar .tb-skgpt .ic { color: var(--green); }
  body { padding-bottom: 86px; }
  .footer { margin-bottom: 0; }
}