/* SupAgent v2 — electric-cyan-on-near-black, over a live WebGL background. See DESIGN.md. */

:root {
  --void: oklch(0.15 0.030 256);
  --deep: oklch(0.32 0.110 256);
  --ink: oklch(0.90 0.045 268);
  --mute: oklch(0.66 0.030 262);
  --cyan: oklch(0.70 0.150 244);
  --cyan-hi: oklch(0.84 0.110 232);

  --line: color-mix(in oklab, var(--ink) 14%, transparent);
  --line-strong: color-mix(in oklab, var(--ink) 26%, transparent);
  --cyan-soft: color-mix(in oklab, var(--cyan) 16%, transparent);
  --glow: 0 0 24px color-mix(in oklab, var(--cyan) 55%, transparent);
  --glow-strong: 0 0 40px color-mix(in oklab, var(--cyan) 70%, transparent);

  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
  --dur-micro: 200ms;
  --dur-macro: 500ms;

  --maxw: 1200px;
  --gutter: clamp(20px, 5vw, 64px);
  --rail-w: 0px;

  --f-display: "Space Grotesk", sans-serif;
  --f-text: "Hanken Grotesk", sans-serif;
  --f-mono: "Spline Sans Mono", ui-monospace, monospace;
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; overflow-x: hidden; overflow-x: clip; max-width: 100%; }

body {
  background: var(--void);
  color: var(--ink);
  font-family: var(--f-text);
  font-size: clamp(1.0625rem, 1rem + 0.35vw, 1.25rem);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  overflow-x: clip;
  max-width: 100%;
  padding-left: var(--rail-w);
}
@media (min-width: 1024px) { :root { --rail-w: 304px; } }

/* WebGL background + scrim layering */
#bg {
  position: fixed; inset: 0; width: 100%; height: 100%;
  z-index: -2; display: block;
}
body::before {
  content: ""; position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background: linear-gradient(180deg,
    color-mix(in oklab, var(--void) 70%, transparent) 0%,
    color-mix(in oklab, var(--void) 12%, transparent) 26%,
    color-mix(in oklab, var(--void) 12%, transparent) 70%,
    color-mix(in oklab, var(--void) 82%, transparent) 100%);
}
/* Fallback when WebGL is unavailable */
body.no-webgl { background:
  radial-gradient(120% 80% at 50% 12%, #0b2c58 0%, #061634 38%, #020a18 72%) fixed; }
body.no-webgl #bg { display: none; }

a { color: inherit; text-decoration: none; }
::selection { background: var(--cyan); color: var(--void); }
:focus-visible { outline: 2px solid var(--cyan-hi); outline-offset: 3px; }

/* type */
h1, h2, h3 { font-family: var(--f-display); font-weight: 500; letter-spacing: -0.02em; line-height: 1.02; }

.display {
  font-family: var(--f-display); font-weight: 600;
  font-size: clamp(2.3rem, 1.0rem + 6vw, 8.5rem);
  line-height: 0.94; letter-spacing: -0.035em; text-transform: uppercase;
  overflow-wrap: break-word; hyphens: auto;
}
.display em { font-style: normal; color: var(--cyan-hi); text-shadow: var(--glow); }

.lede { font-size: clamp(1.2rem, 1.05rem + 0.6vw, 1.6rem); color: var(--mute); max-width: 52ch; line-height: 1.5; }
.lede strong { color: var(--ink); font-weight: 600; }

.mono { font-family: var(--f-mono); font-size: 0.78rem; letter-spacing: 0.18em; text-transform: uppercase; }

/* layout */
.wrap { max-width: var(--maxw); margin-inline: auto; padding-inline: var(--gutter); width: 100%; }
.section { padding-block: clamp(64px, 10vw, 144px); position: relative; }

.eyebrow { display: flex; width: 100%; align-items: center; gap: 14px; color: var(--cyan-hi); text-shadow: var(--glow); font-size: clamp(0.95rem, 0.85rem + 0.5vw, 1.25rem); font-weight: 600; margin-bottom: 28px; }
.eyebrow .idx { display: inline-flex; align-items: center; justify-content: center; min-width: 2.2em; height: 2.2em; padding: 0 0.5em; color: var(--void); background: var(--cyan); font-weight: 700; box-shadow: var(--glow); }
.eyebrow::after { content: ""; flex: 1; min-width: clamp(32px, 8vw, 96px); height: 2px; background: linear-gradient(90deg, var(--cyan), transparent); }

/* brand */
.brand { display: inline-flex; align-items: center; gap: 14px; font-family: var(--f-display); font-size: clamp(1.5rem, 1.1rem + 1.4vw, 2rem); letter-spacing: 0.01em; }
.brand__mark { width: 60px; height: 60px; flex: none; display: block; filter: drop-shadow(var(--glow)); }
.brand b { font-weight: 500; }
.brand span { color: var(--cyan-hi); }

/* left rail (replaces top nav). Desktop = fixed vertical 3D carousel; mobile = top bar. */
.rail {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 14px var(--gutter); flex-wrap: wrap; row-gap: 10px;
  background: color-mix(in oklab, var(--void) 60%, transparent);
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
}
.rail__carousel { display: none; }
.rail__pages { display: flex; gap: clamp(16px, 3vw, 34px); align-items: center; }
.rail__pages a { position: relative; color: var(--mute); font-family: var(--f-mono); font-size: 0.82rem; letter-spacing: 0.16em; text-transform: uppercase; transition: color var(--dur-micro) var(--ease); }
.rail__pages a:hover, .rail__pages a[aria-current="page"] { color: var(--ink); }
.rail__pages a[aria-current="page"]::after { content: ""; position: absolute; left: 0; right: 0; bottom: -8px; height: 2px; background: var(--cyan); box-shadow: var(--glow); }

@media (min-width: 1024px) {
  .rail {
    position: fixed; inset: 0 auto 0 0; width: var(--rail-w);
    flex-direction: column; align-items: stretch; justify-content: space-between;
    flex-wrap: nowrap; gap: 0; padding: clamp(24px, 4vh, 44px) 26px;
    background: none; backdrop-filter: none; -webkit-backdrop-filter: none;
    border-bottom: 0; border-right: 1px solid var(--line);
  }
  .rail__brand { flex: none; }
  /* page links live in the footer on desktop; the carousel is the rail's menu */
  .rail__pages { display: none; }

  /* 3D vertical carousel of on-page sections */
  .rail__carousel { display: block; position: relative; flex: 1; min-height: 0; margin: 28px 0; perspective: 620px; }
  .carousel__list { position: absolute; inset: 0; transform-style: preserve-3d; }
  .carousel__item { position: absolute; left: 0; right: 0; top: 50%; transform-origin: 50% 50%; will-change: transform, opacity; }
  .carousel__item button {
    display: flex; align-items: center; gap: 14px; width: 100%; white-space: nowrap;
    background: none; border: 0; cursor: pointer; text-align: left; padding: 4px 0;
    font-family: var(--f-display); font-weight: 500; letter-spacing: 0.01em; text-transform: uppercase;
    font-size: 2.36rem; line-height: 1; color: var(--mute);
    transition: color var(--dur-micro) var(--ease), text-shadow var(--dur-micro) var(--ease);
  }
  .carousel__item .mk { width: 10px; height: 10px; flex: none; border: 1px solid var(--line-strong); transition: all var(--dur-micro) var(--ease); }
  .carousel__item button:hover { color: var(--ink); }
  .carousel__item button:hover .mk { border-color: var(--cyan); box-shadow: var(--glow); }
  .carousel__item.is-active button { color: var(--cyan-hi); text-shadow: var(--glow); }
  .carousel__item.is-active .mk { background: var(--cyan); border-color: var(--cyan); box-shadow: var(--glow); }
  .carousel__item.is-page button { color: var(--ink); }
  .carousel__item.is-page .mk { background: var(--cyan); border-color: var(--cyan); box-shadow: var(--glow); }

  /* drop-out sub-items (sections of the current page) */
  .carousel__item--sub button {
    font-family: var(--f-mono); font-weight: 400;
    font-size: 0.95rem; letter-spacing: 0.18em; text-transform: uppercase;
    padding-left: 34px; position: relative;
  }
  .carousel__item--sub .mk { width: 6px; height: 6px; }
  .carousel__item--sub button::before {
    content: ""; position: absolute; left: 12px; top: 50%; width: 14px; height: 1px;
    background: var(--line-strong);
  }
  .carousel__item--sub .lbl.is-live { color: var(--cyan); text-shadow: var(--glow); }
  .carousel__item--sub.is-active button::before { background: var(--cyan); box-shadow: var(--glow); }
}

/* mobile: same section carousel as desktop, laid out horizontally */
@media (max-width: 1023.98px) {
  .has-carousel .rail__pages { display: none; }
  .has-carousel .rail__brand { order: 1; }
  .has-carousel .rail__lang { order: 2; margin-left: auto; }
  .has-carousel .rail__carousel {
    display: block; order: 3; position: relative;
    flex-basis: 100%; width: 100%; height: 46px; margin-top: 8px;
    perspective: 620px; overflow: hidden;
    -webkit-mask-image: linear-gradient(90deg, transparent, #000 14%, #000 86%, transparent);
            mask-image: linear-gradient(90deg, transparent, #000 14%, #000 86%, transparent);
  }
  .has-carousel .carousel__list { position: absolute; inset: 0; transform-style: preserve-3d; }
  .has-carousel .carousel__item { position: absolute; left: 50%; top: 50%; will-change: transform, opacity; }
  .has-carousel .carousel__item button {
    display: flex; align-items: center; gap: 10px; white-space: nowrap;
    background: none; border: 0; cursor: pointer; text-align: left; padding: 4px 2px;
    font-family: var(--f-display); font-weight: 500; letter-spacing: 0.02em; text-transform: uppercase;
    font-size: 1.15rem; line-height: 1; color: var(--mute);
    transition: color var(--dur-micro) var(--ease), text-shadow var(--dur-micro) var(--ease);
  }
  .has-carousel .carousel__item .mk { width: 8px; height: 8px; flex: none; border: 1px solid var(--line-strong); transition: all var(--dur-micro) var(--ease); }
  .has-carousel .carousel__item.is-active button { color: var(--cyan-hi); text-shadow: var(--glow); }
  .has-carousel .carousel__item.is-active .mk { background: var(--cyan); border-color: var(--cyan); box-shadow: var(--glow); }
  .has-carousel .carousel__item.is-page button { color: var(--ink); }
  .has-carousel .carousel__item.is-page .mk { background: var(--cyan); border-color: var(--cyan); box-shadow: var(--glow); }
  .has-carousel .carousel__item--sub button {
    font-family: var(--f-mono); font-weight: 400;
    font-size: 0.72rem; letter-spacing: 0.16em; padding-left: 16px; position: relative;
  }
  .has-carousel .carousel__item--sub .mk { width: 5px; height: 5px; }
  .has-carousel .carousel__item--sub button::before {
    content: ""; position: absolute; left: 2px; top: 50%; width: 10px; height: 1px; background: var(--line-strong);
  }
  .has-carousel .carousel__item--sub .lbl.is-live { color: var(--cyan); text-shadow: var(--glow); }
  .has-carousel .carousel__item--sub.is-active button::before { background: var(--cyan); box-shadow: var(--glow); }
}

/* buttons */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--f-mono); font-size: 0.82rem; letter-spacing: 0.14em; text-transform: uppercase;
  padding: 16px 22px; border: 1px solid var(--line-strong); color: var(--ink);
  transition: border-color var(--dur-micro) var(--ease), color var(--dur-micro) var(--ease), background var(--dur-micro) var(--ease), box-shadow var(--dur-micro) var(--ease);
}
.btn:hover { border-color: var(--ink); }
.btn--accent { border-color: var(--cyan); }
.btn--accent:hover { background: var(--cyan); color: var(--void); border-color: var(--cyan); box-shadow: var(--glow-strong); }
.btn .arrow { transition: transform var(--dur-micro) var(--ease); }
.btn:hover .arrow { transform: translateX(4px); }
.btn-row { display: flex; flex-wrap: wrap; gap: 14px; }

/* corner-marked frame */
.framed { position: relative; }
.corner { position: absolute; width: 8px; height: 8px; border: 1px solid var(--cyan); }
.corner.tl { top: -1px; left: -1px; border-right: 0; border-bottom: 0; }
.corner.tr { top: -1px; right: -1px; border-left: 0; border-bottom: 0; }
.corner.bl { bottom: -1px; left: -1px; border-right: 0; border-top: 0; }
.corner.br { bottom: -1px; right: -1px; border-left: 0; border-top: 0; }

/* square grid motif */
.grid-motif { display: grid; grid-template-columns: repeat(var(--cols, 6), 1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); width: 100%; }
.grid-motif .cell { aspect-ratio: 1; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); position: relative; transition: background var(--dur-macro) var(--ease); }
.grid-motif .cell.on { background: var(--cyan-soft); box-shadow: inset 0 0 18px color-mix(in oklab, var(--cyan) 35%, transparent); }
.grid-motif .cell.dot::after { content: ""; position: absolute; inset: 50% auto auto 50%; width: 4px; height: 4px; transform: translate(-50%, -50%); background: var(--cyan-hi); box-shadow: var(--glow); }

/* stats */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--line); }
.stat { padding: 28px 0; border-bottom: 1px solid var(--line); }
.stat__num { font-family: var(--f-display); font-weight: 500; font-size: clamp(3rem, 1.8rem + 3.6vw, 5rem); line-height: 1; letter-spacing: -0.03em; color: var(--cyan-hi); text-shadow: var(--glow); }
.stat__cap { color: var(--mute); margin-top: 10px; max-width: 22ch; }

/* concept panels (home) */
.panel { min-height: 88svh; display: flex; align-items: center; }
.panel + .panel { border-top: 1px solid var(--line); }
.panel__grid { display: grid; grid-template-columns: 1fr; gap: 40px; width: 100%; align-items: center; }
.panel__statement { font-family: var(--f-display); font-weight: 500; font-size: clamp(2.1rem, 1.1rem + 4.6vw, 5.25rem); line-height: 0.98; letter-spacing: -0.035em; overflow-wrap: break-word; word-break: break-word; hyphens: auto; }
.panel__statement em { font-style: normal; color: var(--cyan-hi); text-shadow: var(--glow); }
.panel__body { color: var(--mute); max-width: 46ch; }
.panel__body strong { color: var(--ink); font-weight: 500; }
@media (min-width: 900px) { .panel__grid { grid-template-columns: 1.1fr 0.9fr; gap: 64px; } }

/* definition rows */
.rows { border-top: 1px solid var(--line); }
.row { display: grid; grid-template-columns: 1fr; gap: 8px; padding: 24px 0; border-bottom: 1px solid var(--line); }
.row__k { font-family: var(--f-display); font-weight: 500; font-size: 1.5rem; letter-spacing: -0.01em; }
.row__v { color: var(--mute); max-width: 64ch; }
.row__v code, code.inline { font-family: var(--f-mono); font-size: 0.82em; color: var(--cyan-hi); background: color-mix(in oklab, var(--cyan) 10%, transparent); padding: 1px 6px; }
.row__n { color: var(--cyan); font-family: var(--f-mono); font-size: 0.78rem; letter-spacing: 0.16em; }
@media (min-width: 820px) { .row { grid-template-columns: 44px 1.1fr 1.6fr; align-items: baseline; gap: 32px; } }

/* layer stack (about) */
.stack { display: grid; gap: 0; border: 1px solid var(--line); background: color-mix(in oklab, var(--void) 35%, transparent); }
.layer { display: grid; grid-template-columns: auto 1fr; gap: 20px; align-items: baseline; padding: 22px clamp(16px, 3vw, 32px); border-bottom: 1px solid var(--line); }
.layer:last-child { border-bottom: 0; }
.layer__id { font-family: var(--f-mono); color: var(--cyan); font-size: 0.95rem; }
.layer__name { font-family: var(--f-display); font-weight: 500; font-size: 1.35rem; }
.layer__desc { color: var(--mute); margin-top: 4px; font-size: 1.0625rem; }

/* footer */
.footer { border-top: 1px solid var(--line); padding-block: 48px; background: color-mix(in oklab, var(--void) 50%, transparent); }
.footer__row { display: flex; flex-wrap: wrap; gap: 24px; justify-content: space-between; align-items: flex-start; }
.footer__nav { display: flex; gap: 24px; flex-wrap: wrap; }
.footer__nav a { color: var(--mute); transition: color var(--dur-micro) var(--ease); }
.footer__nav a:hover { color: var(--ink); }
.footer__meta { color: var(--mute); max-width: 40ch; }

/* reveal */
.reveal { opacity: 0; transform: translateY(20px); transition: opacity var(--dur-macro) var(--ease), transform var(--dur-macro) var(--ease); }
.reveal.in { opacity: 1; transform: none; }

/* matrix-style heading scramble (vanilla reproduction of Hubtown's GSAP SplitText+ScrambleText) */
.ch { display: inline; }
.ch.is-live { color: var(--cyan); text-shadow: var(--glow); }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  * { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
}