:root {
  --bg: #020604;
  --fg: #e6fff0;
  --muted: rgba(230, 255, 240, 0.66);
  --green: #3dff8a;
  --green-dim: rgba(61, 255, 138, 0.28);
  --glass: rgba(3, 12, 7, 0.62);
  --gutter: clamp(16px, 4vw, 56px);
  color-scheme: dark;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--fg);
  font-family: "Space Grotesk", system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

.mono { font-family: "JetBrains Mono", ui-monospace, monospace; letter-spacing: 0.12em; }
em { font-family: "Instrument Serif", Georgia, serif; font-style: italic; font-weight: 400; color: var(--green); letter-spacing: -0.01em; }
a { color: inherit; text-decoration: none; }

#scene { position: fixed; inset: 0; width: 100%; height: 100%; z-index: 0; display: block; }
main { position: relative; z-index: 2; }

.fx { position: fixed; inset: 0; pointer-events: none; z-index: 3; }
.scanlines { background: repeating-linear-gradient(to bottom, rgba(61, 255, 138, 0.025) 0 1px, transparent 1px 3px); }

/* Loader ---------------------------------------------------------------- */
#loader {
  position: fixed; inset: 0; z-index: 50; background: var(--bg);
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 18px;
  font-size: 11px; color: var(--green); transition: opacity 1.2s ease 0.2s, visibility 0s 1.4s;
}
#loader .bar { width: 220px; height: 1px; background: var(--green-dim); position: relative; overflow: hidden; }
#loader .bar::after { content: ""; position: absolute; inset: 0; width: var(--p, 4%); background: var(--green); box-shadow: 0 0 10px var(--green); transition: width .4s ease; }
body.ready #loader { opacity: 0; visibility: hidden; }

/* HUD ---------------------------------------------------------------- */
.hud-top {
  position: fixed; top: 0; left: 0; right: 0; z-index: 10;
  display: flex; justify-content: space-between; align-items: center;
  padding: 22px var(--gutter);
}
.brand { font-weight: 700; font-size: 18px; letter-spacing: 0.2em; display: flex; align-items: center; gap: 12px; }
.brand-sub { font-size: 10px; color: var(--green); border: 1px solid var(--green-dim); padding: 3px 7px; letter-spacing: 0.2em; }
.helix-mark {
  width: 14px; height: 22px; position: relative;
  background:
    radial-gradient(circle, var(--green) 1.5px, transparent 2px) 0 0 / 14px 5.5px,
    linear-gradient(90deg, transparent 6px, var(--green-dim) 6px 8px, transparent 8px);
  animation: helixspin 2.4s linear infinite;
}
@keyframes helixspin { 50% { transform: scaleX(-1); } }
.hud-top nav { display: flex; gap: 28px; font-size: 14px; align-items: center; }
.hud-top nav a { color: var(--muted); transition: color .2s; }
.hud-top nav a:hover { color: var(--fg); }
.hud-top nav .nav-cta { color: var(--fg); border: 1px solid var(--green-dim); padding: 8px 18px; background: rgba(61, 255, 138, 0.06); }

.hud-telemetry {
  position: fixed; left: var(--gutter); bottom: 46px; z-index: 10;
  font-size: 10.5px; display: grid; gap: 5px; color: var(--muted);
  padding: 14px 16px; background: rgba(2, 10, 5, 0.55); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--green-dim); transition: opacity .5s;
}
.log-title { color: var(--green); margin-bottom: 4px; }
.hud-telemetry div { display: flex; gap: 18px; justify-content: space-between; min-width: 190px; }
.hud-telemetry b { color: var(--fg); font-weight: 500; }
.hide-log .hud-telemetry { opacity: 0; }

.hud-progress { position: fixed; right: var(--gutter); top: 50%; transform: translateY(-50%); width: 1px; height: 30vh; background: var(--green-dim); z-index: 10; }
.hud-progress span { position: absolute; left: 0; top: 0; width: 100%; height: 0%; background: var(--green); box-shadow: 0 0 8px var(--green); }

.dna-ticker {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 9; height: 26px; overflow: hidden;
  border-top: 1px solid rgba(61, 255, 138, 0.14); background: rgba(2, 8, 4, 0.6);
  font-size: 10px; color: rgba(61, 255, 138, 0.55); white-space: nowrap; line-height: 26px;
}
.dna-ticker span { display: inline-block; padding-left: 100%; animation: tick 60s linear infinite; }
@keyframes tick { to { transform: translateX(-100%); } }

/* Leader line for entries */
#leader { position: fixed; inset: 0; width: 100%; height: 100%; z-index: 4; pointer-events: none; opacity: 0; transition: opacity .4s; }
#leader.on { opacity: 1; }
#leader-path { fill: none; stroke: var(--green); stroke-width: 1.2; filter: drop-shadow(0 0 4px var(--green)); }
#leader-dot { fill: var(--green); }
#leader-ring { fill: none; stroke: var(--green); stroke-width: 1; animation: ring 1.6s ease-out infinite; transform-box: fill-box; transform-origin: center; }
@keyframes ring { from { transform: scale(1); opacity: 1; } to { transform: scale(4); opacity: 0; } }

/* Hero --------------------------------------------------------------- */
#hero { min-height: 100svh; display: flex; align-items: center; padding: 120px var(--gutter) 100px; position: relative; }
.hero-copy { max-width: 600px; }
.kicker { font-size: 11px; color: var(--green); margin-bottom: 22px; display: flex; align-items: center; gap: 10px; }
.dot { width: 7px; height: 7px; border-radius: 50%; background: var(--green); box-shadow: 0 0 10px var(--green); animation: blink 1.4s infinite; }
@keyframes blink { 50% { opacity: 0.25; } }
h1 { font-size: clamp(3.2rem, 8vw, 7.4rem); line-height: 0.92; letter-spacing: -0.045em; font-weight: 700; text-shadow: 0 0 40px rgba(61, 255, 138, 0.15); }
h1 em { font-size: 1.08em; }
.lede { margin-top: 26px; font-size: 18px; line-height: 1.6; color: var(--muted); max-width: 460px; }
.hero-actions { display: flex; gap: 12px; margin-top: 34px; flex-wrap: wrap; }
.btn {
  display: inline-block; padding: 14px 26px; font-weight: 500; font-size: 15px;
  background: var(--green); color: #021208;
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 12px 100%, 0 calc(100% - 12px));
  transition: transform .2s, background .2s;
}
.btn:hover { transform: translateY(-2px); background: #7dffb2; }
.btn.ghost { background: rgba(61, 255, 138, 0.08); color: var(--fg); box-shadow: inset 0 0 0 1px var(--green-dim); }
.btn.big { font-size: 17px; padding: 18px 34px; }
.scroll-hint { position: absolute; left: 50%; bottom: 44px; transform: translateX(-50%); font-size: 10px; color: var(--muted); display: flex; flex-direction: column; align-items: center; gap: 10px; }
.scroll-hint span { width: 1px; height: 42px; background: linear-gradient(var(--green), transparent); animation: drip 1.8s infinite; transform-origin: top; }
@keyframes drip { 0% { transform: scaleY(0); } 60% { transform: scaleY(1); opacity: 1; } 100% { opacity: 0; } }

/* Shift -------------------------------------------------------------- */
#shift { height: 220vh; }
.sticky { position: sticky; top: 0; height: 100svh; display: flex; align-items: flex-end; padding: 0 var(--gutter) 14vh; pointer-events: none; }
.shift-readout { margin-left: auto; text-align: right; }
.label { font-size: 11px; color: var(--green); }
.label.dim { color: var(--muted); }
.angle { font-size: clamp(5rem, 13vw, 11rem); font-weight: 700; line-height: 1; letter-spacing: -0.05em; color: transparent; -webkit-text-stroke: 1.5px var(--green); font-variant-numeric: tabular-nums; }

/* Entries ------------------------------------------------------------ */
#entries { height: 420vh; }
.entries-sticky { position: sticky; top: 0; height: 100svh; pointer-events: none; }
.entry {
  position: absolute; top: 24vh; width: min(380px, calc(100vw - 2 * var(--gutter))); padding: 26px 26px 22px;
  background: var(--glass); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--green-dim);
  opacity: 0; transform: translateY(24px); transition: opacity .5s ease, transform .6s cubic-bezier(.2,.8,.2,1);
}
.entry[data-side="left"] { left: var(--gutter); }
.entry[data-side="right"] { right: calc(var(--gutter) + 24px); }
.entry.active { opacity: 1; transform: none; pointer-events: auto; }
.entry::before, .entry::after { content: ""; position: absolute; width: 12px; height: 12px; border: 1.5px solid var(--green); }
.entry::before { top: -1px; left: -1px; border-right: 0; border-bottom: 0; }
.entry::after { bottom: -1px; right: -1px; border-left: 0; border-top: 0; }
.entry-id { font-size: 11px; color: var(--green); }
.seq { font-size: 11px; color: rgba(61, 255, 138, 0.5); margin: 8px 0 14px; letter-spacing: 0.3em; }
.entry h2 { font-size: 28px; line-height: 1.1; letter-spacing: -0.02em; margin-bottom: 10px; }
.entry p { color: var(--muted); line-height: 1.6; }
.entry .meta { margin-top: 16px; font-size: 10px; color: var(--muted); display: flex; justify-content: space-between; }
.entry .meta span { color: var(--green); }
.entries-count { position: absolute; right: var(--gutter); bottom: 46px; font-size: 11px; color: var(--muted); }
.entries-count span { color: var(--green); }

/* Exit --------------------------------------------------------------- */
#exit { height: 140vh; }
.exit-sticky { align-items: center; justify-content: center; }
.exit-line { font-size: 12px; color: var(--green); padding: 10px 16px; border: 1px solid var(--green-dim); background: rgba(2, 10, 5, 0.6); animation: blink 1.1s infinite; }

/* Info ------------------------------------------------------------- */
#info { position: relative; padding: 18vh var(--gutter) 30vh; display: grid; gap: 22vh; max-width: 1320px; margin: 0 auto; }
.panel, .info-block, .feature, .protocol, .stats { background: rgba(2, 9, 5, 0.78); backdrop-filter: blur(18px); -webkit-backdrop-filter: blur(18px); border: 1px solid var(--green-dim); }
.info-block.intro { display: grid; grid-template-columns: 1.1fr 1fr; gap: clamp(28px, 5vw, 72px); align-items: center; padding: clamp(28px, 5vw, 64px); }
.info-block h2, .info-head h2 { font-size: clamp(2.2rem, 4.6vw, 4.2rem); line-height: 1; letter-spacing: -0.04em; margin: 16px 0 22px; }
.info-head { text-align: center; max-width: 820px; margin: 0 auto -10vh; }
.big { font-size: clamp(17px, 1.5vw, 20px); line-height: 1.65; color: var(--muted); }
.specimen { position: relative; margin: 0; }
.specimen img { display: block; width: 100%; aspect-ratio: 4 / 3; object-fit: cover; background: #030a06; border: 1px solid var(--green-dim); }
.specimen.wide img { aspect-ratio: 16 / 10; }
.specimen::before, .specimen::after { content: ""; position: absolute; width: 22px; height: 22px; border: 2px solid var(--green); z-index: 1; }
.specimen::before { top: -6px; left: -6px; border-right: 0; border-bottom: 0; }
.specimen::after { bottom: 22px; right: -6px; border-left: 0; border-top: 0; }
.specimen figcaption { font-size: 10px; color: var(--green); margin-top: 10px; }
.feature { display: grid; grid-template-columns: 1.35fr 1fr; gap: clamp(28px, 4vw, 60px); align-items: center; padding: clamp(22px, 3.5vw, 44px); }
.feature.flip .specimen { order: 2; }
.feature h3 { font-size: clamp(1.8rem, 3vw, 2.8rem); line-height: 1.05; letter-spacing: -0.03em; margin: 14px 0 16px; }
.feature p { color: var(--muted); line-height: 1.65; font-size: 17px; }
.spec { list-style: none; margin-top: 26px; font-size: 11px; border-top: 1px solid var(--green-dim); }
.spec li { display: flex; justify-content: space-between; padding: 11px 0; border-bottom: 1px solid rgba(61, 255, 138, 0.12); color: var(--muted); }
.spec b { color: var(--fg); font-weight: 500; }
.protocol { list-style: none; display: grid; grid-template-columns: repeat(4, 1fr); }
.protocol li { padding: 34px 28px 38px; border-right: 1px solid rgba(61, 255, 138, 0.14); position: relative; }
.protocol li:last-child { border-right: 0; }
.protocol span { color: var(--green); font-size: 12px; }
.protocol h4 { font-size: 24px; margin: 46px 0 10px; letter-spacing: -0.02em; }
.protocol p { color: var(--muted); line-height: 1.6; }
.protocol li::after { content: ""; position: absolute; left: 28px; top: 70px; width: 40px; height: 1px; background: var(--green); box-shadow: 0 0 8px var(--green); }
.stats { display: grid; grid-template-columns: repeat(4, 1fr); }
.stats div { padding: 40px 28px; border-right: 1px solid rgba(61, 255, 138, 0.14); }
.stats div:last-child { border-right: 0; }
.stats b { display: block; font-size: clamp(2.4rem, 4.5vw, 4rem); letter-spacing: -0.04em; color: var(--green); text-shadow: 0 0 30px rgba(61, 255, 138, 0.35); }
.stats span { font-size: 10px; color: var(--muted); }
.reveal { opacity: 0; transform: translateY(50px); transition: opacity .9s ease, transform 1s cubic-bezier(.2,.8,.2,1); }
.reveal.in { opacity: 1; transform: none; }

/* Contact ------------------------------------------------------------ */
#contact { height: 300vh; }
.contact-sticky { position: sticky; top: 0; height: 100svh; display: flex; align-items: flex-end; justify-content: center; padding: 0 var(--gutter) 46px; }
.contact-card {
  width: min(1100px, 100%); padding: 24px 30px; display: grid; grid-template-columns: 1fr auto; gap: 6px 40px; align-items: center;
  background: var(--glass); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--green-dim); position: relative;
  opacity: 0; transform: translateY(30px); transition: opacity .6s ease, transform .7s cubic-bezier(.2,.8,.2,1);
}
.contact-card.show { opacity: 1; transform: none; }
#bite-flash { z-index: 20; background: radial-gradient(ellipse at center, rgba(200, 255, 220, 0.85), rgba(61, 255, 138, 0.35) 45%, rgba(2, 6, 4, 0.9)); opacity: 0; }
#bite-flash.on { animation: biteflash .9s ease-out; }
@keyframes biteflash { 0% { opacity: 0; } 8% { opacity: 1; } 100% { opacity: 0; } }
.contact-card.bitten { animation: bitten .55s cubic-bezier(.36,.07,.19,.97); border-color: var(--green); box-shadow: 0 0 60px rgba(61, 255, 138, 0.35); }
@keyframes bitten {
  10% { transform: translate(-6px, 3px) rotate(-1.4deg); }
  25% { transform: translate(9px, -4px) rotate(1.8deg); }
  45% { transform: translate(-7px, 2px) rotate(-1deg); }
  65% { transform: translate(4px, -1px) rotate(0.6deg); }
  100% { transform: none; }
}
.contact-card .kicker { grid-column: 1 / -1; margin-bottom: 4px; }
.contact-card h2 { font-size: clamp(1.6rem, 2.6vw, 2.4rem); line-height: 1.05; letter-spacing: -0.035em; }
.contact-card .btn { grid-column: 2; grid-row: 2 / span 2; }
.contact-card p { color: var(--muted); line-height: 1.5; }
.contact-card .foot { grid-column: 1 / -1; margin: 10px 0 0; font-size: 9px; }

/* Mobile ------------------------------------------------------------- */
@media (max-width: 760px) {
  .hud-top nav a:not(.nav-cta) { display: none; }
  #hero { align-items: flex-start; padding-top: 110px; }
  .lede { font-size: 16px; }
  .hud-telemetry, .entries-count { display: none; }
  .hud-progress { right: 8px; }
  .shift-readout { margin: 0 auto; text-align: center; }
  .sticky { align-items: flex-start; padding-top: 16vh; }
  .exit-sticky { align-items: center; padding-top: 0; }
  .entry { top: auto; bottom: 46px; left: var(--gutter) !important; right: auto !important; }
  .contact-card { grid-template-columns: 1fr; }
  .contact-card .btn { grid-column: 1; grid-row: auto; justify-self: start; margin-top: 10px; }
  .info-block.intro, .feature { grid-template-columns: 1fr; }
  .feature.flip .specimen { order: 0; }
  .info-head { margin-bottom: -12vh; }
  .protocol, .stats { grid-template-columns: 1fr 1fr; }
  .protocol li:nth-child(2n), .stats div:nth-child(2n) { border-right: 0; }
  .protocol li, .stats div { border-bottom: 1px solid rgba(61, 255, 138, 0.14); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .dot, .scroll-hint span, .dna-ticker span, .helix-mark, #leader-ring, .exit-line { animation: none; }
  .reveal { transition: none; opacity: 1; transform: none; }
}