/* =====================================================================
   Topaas — Topology-as-a-Service
   Stylesheet · v0.2 · sci-fi / spectral
   ===================================================================== */

:root {
  /* — palette (quantum-lab) — */
  --void:         #000208;
  --ink-0:        #04060F;
  --ink-1:        #080C1B;
  --ink-2:        #10152F;
  --ink-3:        #1A2147;
  --ink-4:        #232B58;
  --line:         rgba(220, 230, 255, 0.08);
  --line-strong:  rgba(220, 230, 255, 0.18);

  --paper:        #ECEDF2;
  --paper-dim:    #8A90A8;
  --paper-mute:   #595E78;

  --cyan:         #6BF2FF;
  --cyan-deep:    #2EB1CC;
  --cyan-glow:    rgba(107, 242, 255, 0.45);
  --cyan-soft:    rgba(107, 242, 255, 0.12);

  --magenta:      #FF5BD8;
  --magenta-deep: #B83BA0;
  --magenta-glow: rgba(255, 91, 216, 0.45);
  --magenta-soft: rgba(255, 91, 216, 0.10);

  --violet:       #9F7BFF;
  --violet-glow:  rgba(159, 123, 255, 0.40);

  --amber:        #FFB552;
  --amber-glow:   rgba(255, 181, 82, 0.4);

  /* — type — */
  --display: "Bricolage Grotesque", "Inter Tight", system-ui, sans-serif;
  --sans:    "IBM Plex Sans", "Helvetica Neue", system-ui, sans-serif;
  --mono:    "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --shell-max: 1340px;
  --pad-x: clamp(20px, 4vw, 80px);
  --pad-y: clamp(90px, 12vw, 160px);

  --ease: cubic-bezier(.2,.6,.2,1);
  --ease-out: cubic-bezier(.18,.8,.25,1);
}

* { box-sizing: border-box; }
*::selection { background: var(--cyan); color: var(--ink-0); }

html, body {
  margin: 0;
  padding: 0;
  background: var(--ink-0);
  color: var(--paper);
  font-family: var(--sans);
  font-size: 16.5px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-feature-settings: "ss01", "ss02", "kern", "liga";
  overflow-x: hidden;
}

body {
  position: relative;
  min-height: 100vh;
  background:
    radial-gradient(1400px 800px at 82% -10%, rgba(255, 91, 216, 0.10), transparent 60%),
    radial-gradient(1100px 700px at 5%  20%, rgba(107, 242, 255, 0.08), transparent 65%),
    radial-gradient(1200px 900px at 50% 130%, rgba(159, 123, 255, 0.07), transparent 60%),
    linear-gradient(180deg, var(--ink-0), var(--void) 100%);
}

img, svg { display: block; max-width: 100%; }

a { color: inherit; text-decoration: none; text-underline-offset: 3px; }

/* — Background canvas: graph network — */
#field {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  opacity: 0.42;
  pointer-events: none;
}

/* — Grain — */
.grain {
  position: fixed;
  inset: -50%;
  z-index: 1;
  pointer-events: none;
  opacity: 0.05;
  mix-blend-mode: overlay;
  background-image:
    url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='240' height='240'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='1.5' numOctaves='2' stitchTiles='stitch'/></filter><rect width='100%' height='100%' filter='url(%23n)' opacity='0.85'/></svg>");
  animation: grain 8s steps(8) infinite;
}
@keyframes grain {
  0%   { transform: translate(0,0); }
  25%  { transform: translate(-3%,2%); }
  50%  { transform: translate(2%,-3%); }
  75%  { transform: translate(-2%,-2%); }
  100% { transform: translate(0,0); }
}

/* — Vignette — */
.vignette {
  position: fixed;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  background:
    radial-gradient(80% 60% at 50% 45%, rgba(0, 2, 8, 0.55) 0%, transparent 60%),
    radial-gradient(130% 95% at 50% 50%, transparent 45%, rgba(0, 2, 8, 0.85) 100%);
}

/* — Floating decorative equations — */
.float-eq {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  font-family: var(--mono);
  font-weight: 300;
  font-size: 11px;
  color: rgba(236, 237, 242, 0.18);
  letter-spacing: 0.04em;
}
.float-eq span {
  position: absolute;
  white-space: nowrap;
  animation: drift 24s ease-in-out infinite;
}
.float-eq .eq-1 { top: 10%; left: 6%;  animation-delay: -1s;  color: rgba(107,242,255,0.30); }
.float-eq .eq-2 { top: 32%; left: 3%;  animation-delay: -7s;  animation-duration: 28s; }
.float-eq .eq-3 { top: 64%; left: 4%;  animation-delay: -12s; animation-duration: 32s; color: rgba(255,91,216,0.30); }
.float-eq .eq-4 { top: 14%; right: 6%; animation-delay: -3s;  animation-duration: 26s; }
.float-eq .eq-5 { top: 38%; right: 4%; animation-delay: -9s;  animation-duration: 30s; color: rgba(159,123,255,0.30); }
.float-eq .eq-6 { top: 72%; right: 6%; animation-delay: -15s; animation-duration: 32s; }
.float-eq .eq-7 { top: 82%; left: 38%; animation-delay: -5s;  animation-duration: 34s; }
.float-eq .eq-8 { top:  6%; left: 44%; animation-delay: -18s; animation-duration: 28s; color: rgba(255,91,216,0.30); }

@keyframes drift {
  0%, 100% { transform: translateY(0) translateX(0); opacity: 0.4; }
  50%      { transform: translateY(-12px) translateX(8px); opacity: 1; }
}

/* — Floating topology glyphs — */
.topo-glyphs {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
}
.topo {
  position: absolute;
  opacity: 0.08;
  animation: float 28s ease-in-out infinite;
}
.topo-trefoil { top: 8%;   right: 9%;  width: 110px; color: var(--cyan); }
.topo-torus   { top: 52%;  left: 6%;   width: 130px; color: var(--magenta); animation-delay: -8s; animation-duration: 34s; }
.topo-mobius  { bottom: 8%; right: 10%; width: 140px; color: var(--violet); animation-delay: -14s; animation-duration: 30s; }
.topo-cy      { top: 22%;  left: 41%;  width: 80px;  color: var(--cyan); animation-delay: -4s; animation-duration: 26s; opacity: 0.05; }

@keyframes float {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50%      { transform: translateY(-18px) rotate(8deg); }
}

/* =====================================================================
   NAV
   ===================================================================== */

.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding: 20px var(--pad-x);
  background: linear-gradient(180deg, rgba(4, 6, 15, 0.85), rgba(4, 6, 15, 0));
  backdrop-filter: blur(10px) saturate(140%);
  -webkit-backdrop-filter: blur(10px) saturate(140%);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--paper);
}
.brand-mark { color: var(--cyan); display: inline-flex; filter: drop-shadow(0 0 6px var(--cyan-glow)); }
.brand-text { display: flex; flex-direction: column; line-height: 1; }
.brand-name {
  font-family: var(--mono);
  font-weight: 500;
  font-size: 13px;
  letter-spacing: 0.30em;
  color: var(--paper);
}
.brand-sub {
  margin-top: 4px;
  font-family: var(--mono);
  font-weight: 300;
  font-size: 9.5px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--paper-mute);
}

.nav-links {
  display: inline-flex;
  align-items: center;
  gap: 32px;
  font-family: var(--mono);
  font-weight: 400;
  font-size: 11px;
  letter-spacing: 0.20em;
  text-transform: uppercase;
  color: var(--paper-dim);
}
.nav-links a {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 4px 0;
  transition: color .25s var(--ease);
}
.nav-num {
  color: var(--cyan);
  font-weight: 500;
  font-size: 9.5px;
  letter-spacing: 0.18em;
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -6px;
  height: 1px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .35s var(--ease);
}
.nav-links a:hover { color: var(--paper); }
.nav-links a:hover::after { transform: scaleX(1); }

.nav-status {
  justify-self: end;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--paper-dim);
}
.pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 0 var(--cyan-glow);
  animation: pulse 2.4s ease-out infinite;
}
@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 var(--cyan-glow); }
  70%  { box-shadow: 0 0 0 12px rgba(107, 242, 255, 0); }
  100% { box-shadow: 0 0 0 0 rgba(107, 242, 255, 0); }
}

/* =====================================================================
   HERO
   ===================================================================== */

main { position: relative; z-index: 10; }

.hero {
  position: relative;
  padding: clamp(130px, 17vh, 200px) var(--pad-x) clamp(70px, 11vh, 130px);
  max-width: var(--shell-max);
  margin: 0 auto;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(0, 1fr);
  gap: clamp(40px, 5.5vw, 80px);
  align-items: center;
}

.hero-copy { position: relative; z-index: 2; }

/* — eyebrow chip — */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 32px;
  padding: 7px 16px 7px 11px;
  font-family: var(--mono);
  font-weight: 300;
  font-size: 10.5px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--paper-dim);
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.012);
}
.eyebrow b {
  color: var(--cyan);
  font-weight: 500;
  letter-spacing: 0.24em;
}
.eyebrow-dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 10px var(--cyan-glow);
}
.eyebrow-num {
  color: var(--cyan);
  font-weight: 500;
  margin-right: 4px;
}

/* — Display title — */
.display {
  margin: 0 0 36px;
  font-family: var(--display);
  font-weight: 350;
  font-size: clamp(60px, 11vw, 170px);
  line-height: 0.86;
  letter-spacing: -0.04em;
  font-variation-settings: "opsz" 96, "wdth" 78, "wght" 350;
  color: var(--paper);
}
.display .line { display: block; }
.display .line:first-child {
  display: flex;
  letter-spacing: -0.05em;
}
.display .line:first-child .char {
  display: inline-block;
  transition: font-variation-settings .9s var(--ease), color .9s var(--ease);
  background: linear-gradient(180deg, var(--paper) 0%, var(--paper) 60%, var(--cyan) 130%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.display .line:first-child .char:nth-child(odd) {
  font-variation-settings: "opsz" 96, "wdth" 75, "wght" 400;
}
.display .line:first-child .char:nth-child(even) {
  font-variation-settings: "opsz" 96, "wdth" 85, "wght" 320;
}
.display .line:first-child:hover .char {
  font-variation-settings: "opsz" 96, "wdth" 100, "wght" 500;
}

.display .line-mono {
  font-family: var(--mono);
  font-weight: 300;
  font-size: 0.32em;
  letter-spacing: 0.55em;
  margin-top: 0.45em;
  color: var(--paper-dim);
  font-variation-settings: normal;
  display: flex;
  align-items: center;
  gap: 18px;
}
.display .line-mono::before {
  content: "";
  flex: 0 0 36px;
  height: 1px;
  background: var(--cyan);
  box-shadow: 0 0 8px var(--cyan-glow);
}
.display .line-mono::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--line-strong), transparent);
  margin-left: 8px;
}

.lede {
  max-width: 640px;
  margin: 0 0 24px;
  font-family: var(--sans);
  font-weight: 300;
  font-size: clamp(17px, 1.65vw, 22px);
  line-height: 1.5;
  letter-spacing: 0;
  color: var(--paper);
}
.lede em {
  font-style: normal;
  color: var(--cyan);
  font-weight: 400;
  position: relative;
}
.lede em::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 1px;
  background: var(--cyan);
  opacity: 0.5;
}

.formula {
  max-width: 720px;
  margin: 0 0 40px;
  font-family: var(--mono);
  font-weight: 300;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--paper-dim);
  background: rgba(0,0,0,0.3);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px 16px;
  overflow-x: auto;
  white-space: nowrap;
}
.formula .paren { color: var(--magenta); opacity: 0.9; }
.formula .arrow { color: var(--paper-mute); margin: 0 8px; }
.formula .hi { color: var(--cyan); text-shadow: 0 0 12px var(--cyan-glow); }

/* — buttons — */
.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 56px;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 24px;
  font-family: var(--mono);
  font-weight: 500;
  font-size: 11.5px;
  letter-spacing: 0.20em;
  text-transform: uppercase;
  border-radius: 4px;
  border: 1px solid transparent;
  cursor: pointer;
  background: transparent;
  color: inherit;
  transition: transform .25s var(--ease), background .25s var(--ease), color .25s var(--ease), border-color .25s var(--ease), box-shadow .25s var(--ease);
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn svg { transition: transform .25s var(--ease); }
.btn:hover svg { transform: translateX(3px); }

.btn-primary {
  background: var(--cyan);
  color: var(--ink-0);
  border-color: var(--cyan);
  box-shadow: 0 10px 30px -10px var(--cyan-glow), inset 0 0 0 1px rgba(255,255,255,0.18);
}
.btn-primary:hover {
  background: #8FF6FF;
  box-shadow: 0 18px 50px -14px var(--cyan-glow), inset 0 0 0 1px rgba(255,255,255,0.25);
}

.btn-ghost {
  border-color: var(--line-strong);
  color: var(--paper);
}
.btn-ghost:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  background: var(--cyan-soft);
}

.btn-large { padding: 17px 32px; font-size: 12px; }

/* — meta strip — */
.hero-meta {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 32px;
  margin: 0;
  padding-top: 32px;
  border-top: 1px solid var(--line);
  max-width: 720px;
}
.hero-meta > div { min-width: 0; }
.hero-meta dt {
  font-family: var(--mono);
  font-weight: 400;
  font-size: 10px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--paper-mute);
  margin-bottom: 8px;
}
.hero-meta dd {
  margin: 0;
  font-family: var(--sans);
  font-weight: 300;
  font-size: 13px;
  color: var(--paper);
  line-height: 1.45;
}

/* =====================================================================
   INSTRUMENT (spectrometer)
   ===================================================================== */

.instrument {
  position: relative;
  border: 1px solid var(--line-strong);
  border-radius: 14px;
  background:
    linear-gradient(160deg, rgba(255,91,216,0.04), transparent 50%),
    linear-gradient(180deg, var(--ink-2) 0%, var(--ink-1) 100%);
  padding: 16px;
  box-shadow:
    0 40px 100px -50px rgba(0, 0, 0, 0.8),
    0 0 0 1px rgba(107, 242, 255, 0.05),
    inset 0 1px 0 rgba(255, 255, 255, 0.04);
  font-family: var(--mono);
  font-weight: 300;
  font-size: 12px;
  color: var(--paper);
  overflow: hidden;
  transform: perspective(2200px) rotateY(-2.5deg) rotateX(1deg);
  transition: transform .8s var(--ease);
}
.instrument::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(0deg, rgba(107,242,255,0.02) 0 1px, transparent 1px 5px);
  pointer-events: none;
  border-radius: inherit;
}

.ins-header {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 4px 6px 14px;
  border-bottom: 1px dashed var(--line);
  margin-bottom: 14px;
  font-size: 10px;
  font-weight: 400;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--paper-dim);
}
.ins-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}
.ins-dot-cyan { background: var(--cyan);    box-shadow: 0 0 10px var(--cyan-glow); }
.ins-dot-mag  { background: var(--magenta); box-shadow: 0 0 10px var(--magenta-glow); }
.ins-dot-am   { background: var(--amber);   box-shadow: 0 0 10px var(--amber-glow); }
.ins-title { margin-left: 8px; color: var(--paper); }
.ins-pid   { margin-left: auto; opacity: 0.65; }

.ins-body { display: grid; gap: 12px; }

.ins-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px 16px;
  background: rgba(0, 0, 0, 0.45);
}

.ins-label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 10px;
  font-family: var(--mono);
  font-weight: 400;
  font-size: 13.5px;
  color: var(--cyan);
  letter-spacing: 0.01em;
}
.ins-label i { font-style: italic; color: var(--paper); }
.ins-label .ins-tag {
  font-family: var(--mono);
  font-weight: 400;
  font-size: 9.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--paper-mute);
}

.graph-svg { width: 100%; height: 175px; display: block; }
.spectrum-svg { width: 100%; height: 65px; display: block; color: var(--magenta); }
.spectrum-svg rect { transition: height .5s var(--ease), y .5s var(--ease); }

.ins-readout {
  display: grid;
  grid-template-columns: auto 1fr auto 1fr auto 1fr auto 1fr;
  align-items: baseline;
  gap: 4px 12px;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-size: 10px;
  font-weight: 400;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--paper-mute);
}
.ins-readout b {
  font-family: var(--mono);
  font-weight: 500;
  color: var(--cyan);
  text-shadow: 0 0 8px var(--cyan-glow);
  letter-spacing: 0;
  text-transform: none;
  text-align: right;
  min-width: 24px;
}
.ins-panel-spec .ins-readout b { color: var(--magenta); text-shadow: 0 0 8px var(--magenta-glow); }

.ins-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 14px;
  padding-top: 10px;
  border-top: 1px dashed var(--line);
  font-size: 9.5px;
  font-weight: 400;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--paper-mute);
}
.ins-blink {
  color: var(--cyan);
  animation: blink 1.4s ease-in-out infinite;
}
@keyframes blink {
  0%, 100% { opacity: 0.25; }
  50%      { opacity: 1; }
}

/* =====================================================================
   HERO TAPE
   ===================================================================== */

.hero-tape {
  margin-top: clamp(60px, 10vh, 96px);
  border-block: 1px solid var(--line);
  padding: 14px 0;
  overflow: hidden;
  position: relative;
  mask-image: linear-gradient(90deg, transparent, black 7%, black 93%, transparent);
  -webkit-mask-image: linear-gradient(90deg, transparent, black 7%, black 93%, transparent);
}
.tape-track {
  display: flex;
  align-items: center;
  gap: 28px;
  width: max-content;
  font-family: var(--sans);
  font-weight: 300;
  font-size: 14px;
  color: var(--paper-dim);
  animation: tape 50s linear infinite;
}
.tape-track > span { display: inline-block; white-space: nowrap; }
.tape-track .t-sym {
  font-family: var(--mono);
  font-weight: 400;
  color: var(--cyan);
  font-size: 14px;
  letter-spacing: 0;
}
.tape-track .t-dot {
  color: var(--paper-mute);
  font-size: 18px;
}
@keyframes tape {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}

/* =====================================================================
   SECTION SHELL
   ===================================================================== */

.section-shell {
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: var(--pad-y) var(--pad-x);
}

.section-head {
  margin-bottom: clamp(50px, 7vw, 90px);
  max-width: 1100px;
}
.section-head .eyebrow { margin-bottom: 32px; }

.display-2 {
  font-family: var(--display);
  font-weight: 360;
  font-size: clamp(34px, 5.2vw, 70px);
  line-height: 1.04;
  letter-spacing: -0.025em;
  margin: 0;
  color: var(--paper);
  font-variation-settings: "opsz" 96, "wdth" 90, "wght" 360;
}
.display-2 em {
  font-style: normal;
  color: var(--cyan);
  font-weight: 420;
  font-variation-settings: "opsz" 96, "wdth" 90, "wght" 450;
}
.display-2 u {
  text-decoration: none;
  color: var(--magenta);
  font-style: italic;
  font-weight: 400;
  font-family: var(--display);
  font-variation-settings: "opsz" 96, "wdth" 95, "wght" 380;
}
.display-2 .dim {
  display: block;
  color: var(--paper-dim);
  font-weight: 320;
  font-size: 0.95em;
  margin-top: 0.06em;
}

.head-sub {
  max-width: 760px;
  margin: 32px 0 0;
  font-family: var(--sans);
  font-weight: 300;
  font-size: 16px;
  line-height: 1.6;
  color: var(--paper-dim);
}

/* =====================================================================
   THE SHAPE OF CODE (Pipeline)
   ===================================================================== */

.shape { position: relative; }

.pipeline {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr;
  align-items: stretch;
  gap: 16px;
}

.step {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 18px;
  padding: 28px 22px 22px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: linear-gradient(180deg, rgba(255,255,255,0.015), rgba(255,255,255,0));
  transition: border-color .35s var(--ease), background .35s var(--ease), transform .35s var(--ease);
}
.step:hover {
  border-color: var(--line-strong);
  background: linear-gradient(180deg, rgba(255,255,255,0.03), rgba(255,255,255,0.005));
  transform: translateY(-3px);
}

.step-num {
  font-family: var(--mono);
  font-weight: 400;
  font-size: 10px;
  letter-spacing: 0.22em;
  color: var(--paper-mute);
}
.step-num span {
  display: inline-block;
  padding: 4px 10px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
}
.step-num-hi span {
  color: var(--cyan);
  border-color: var(--cyan);
  background: var(--cyan-soft);
  box-shadow: 0 0 12px var(--cyan-glow);
}

.step h3 {
  margin: 0 0 8px;
  font-family: var(--display);
  font-weight: 420;
  font-size: 22px;
  letter-spacing: -0.01em;
  color: var(--paper);
  font-variation-settings: "opsz" 24, "wdth" 95, "wght" 450;
}
.step p {
  margin: 0;
  font-family: var(--sans);
  font-weight: 300;
  font-size: 14px;
  line-height: 1.55;
  color: var(--paper-dim);
}
.step-form {
  margin-top: auto !important;
  padding-top: 14px;
  border-top: 1px dashed var(--line);
  color: var(--cyan) !important;
  font-weight: 400 !important;
}
.step-form sub { color: var(--paper-mute); }

.step-arrow {
  align-self: center;
  color: var(--paper-mute);
  width: 30px;
}
.step-arrow svg { width: 100%; opacity: 0.6; }

.step-4 .step-form { color: var(--magenta) !important; }

/* =====================================================================
   OPERATORS (notes grid)
   ===================================================================== */

.operators { position: relative; }

.notes-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.note {
  position: relative;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 32px 28px 24px;
  background: linear-gradient(180deg, rgba(255,255,255,0.014), rgba(255,255,255,0));
  transition: border-color .4s var(--ease), transform .4s var(--ease);
  overflow: hidden;
}
.note::before {
  content: "";
  position: absolute;
  top: 0; left: 32px;
  height: 1px;
  width: 32px;
  background: var(--cyan);
  box-shadow: 0 0 14px var(--cyan-glow);
}
.note-mag::before { background: var(--magenta); box-shadow: 0 0 14px var(--magenta-glow); }
.note-vio::before { background: var(--violet); box-shadow: 0 0 14px var(--violet-glow); }

.note:hover {
  border-color: var(--line-strong);
  transform: translateY(-3px);
}

.note-head {
  display: flex;
  align-items: flex-start;
  gap: 18px;
  margin-bottom: 24px;
}
.note-sym {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px; height: 48px;
  border: 1px solid var(--cyan);
  border-radius: 50%;
  font-family: var(--display);
  font-weight: 420;
  font-style: italic;
  font-size: 24px;
  color: var(--cyan);
  background: var(--cyan-soft);
  font-variation-settings: "opsz" 36, "wdth" 95, "wght" 450;
  flex-shrink: 0;
}
.note-mag .note-sym { color: var(--magenta); border-color: var(--magenta); background: var(--magenta-soft); }
.note-vio .note-sym { color: var(--violet);  border-color: var(--violet);  background: rgba(159,123,255,0.08); }

.note-head > div {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.note-greek {
  font-family: var(--mono);
  font-weight: 400;
  font-size: 10.5px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan);
}
.note-mag .note-greek { color: var(--magenta); }
.note-vio .note-greek { color: var(--violet); }
.note-title {
  font-family: var(--display);
  font-weight: 380;
  font-size: 26px;
  letter-spacing: -0.01em;
  color: var(--paper);
  font-variation-settings: "opsz" 36, "wdth" 95, "wght" 400;
}

.note-body {
  font-family: var(--sans);
  font-weight: 300;
  font-size: 15px;
  line-height: 1.55;
  color: var(--paper-dim);
  margin: 0 0 28px;
  flex: 1;
}

.note-foot {
  padding-top: 16px;
  border-top: 1px dashed var(--line);
  font-family: var(--mono);
  font-weight: 400;
  font-size: 11.5px;
  color: var(--cyan);
}
.note-mag .note-foot { color: var(--magenta); }
.note-vio .note-foot { color: var(--violet); }

.ops-caption {
  max-width: 800px;
  margin: 64px auto 0;
  padding-top: 32px;
  border-top: 1px solid var(--line);
  font-family: var(--sans);
  font-weight: 300;
  font-size: 16px;
  line-height: 1.6;
  text-align: center;
  color: var(--paper-dim);
}

/* General mono helper */
.mono { font-family: var(--mono); font-weight: 400; }

/* =====================================================================
   TRANSMIT
   ===================================================================== */

.transmit { position: relative; }

.transmit-lede {
  max-width: 680px;
  margin: 24px 0 0;
  font-family: var(--sans);
  font-weight: 300;
  font-size: 18px;
  line-height: 1.5;
  color: var(--paper-dim);
}

.transmit-form {
  max-width: 920px;
  margin: 0 auto;
  border: 1px solid var(--line-strong);
  border-radius: 14px;
  padding: clamp(28px, 4vw, 56px);
  background:
    linear-gradient(160deg, rgba(255,91,216,0.04), transparent 50%),
    linear-gradient(180deg, var(--ink-2), var(--ink-1));
  box-shadow: 0 40px 100px -50px rgba(0, 0, 0, 0.7);
  position: relative;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px 32px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: 0;
  padding: 0;
  border: 0;
}
.field-wide { grid-column: 1 / -1; }

.field-label {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--mono);
  font-weight: 400;
  font-size: 11px;
  letter-spacing: 0.20em;
  text-transform: uppercase;
  color: var(--paper-dim);
}
.field-num { color: var(--cyan); font-weight: 500; }
.optional {
  color: var(--paper-mute);
  text-transform: none;
  letter-spacing: 0.04em;
  font-family: var(--mono);
  font-style: italic;
  font-size: 11px;
  font-weight: 300;
}

.field input,
.field textarea {
  font: inherit;
  font-family: var(--sans);
  font-weight: 300;
  font-size: 18px;
  line-height: 1.45;
  color: var(--paper);
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--line-strong);
  padding: 6px 0 12px;
  outline: none;
  border-radius: 0;
  transition: border-color .25s var(--ease);
}
.field input::placeholder,
.field textarea::placeholder {
  color: var(--paper-mute);
  font-style: italic;
}
.field input:focus,
.field textarea:focus { border-color: var(--cyan); }
.field textarea { resize: vertical; min-height: 96px; }

.field-radio { display: flex; flex-direction: column; gap: 14px; }
.radio-row { display: flex; flex-wrap: wrap; gap: 10px; }
.radio-row label {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  border: 1px solid var(--line);
  border-radius: 4px;
  cursor: pointer;
  font-family: var(--mono);
  font-weight: 400;
  font-size: 11.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--paper-dim);
  transition: all .25s var(--ease);
}
.radio-row label:hover { border-color: var(--line-strong); color: var(--paper); }
.radio-row input {
  -webkit-appearance: none;
  appearance: none;
  width: 8px; height: 8px;
  border-radius: 50%;
  border: 1px solid var(--paper-mute);
  background: transparent;
  margin: 0;
  cursor: pointer;
}
.radio-row input:checked {
  border-color: var(--cyan);
  background: var(--cyan);
  box-shadow: 0 0 10px var(--cyan-glow);
}
.radio-row label:has(input:checked) {
  border-color: var(--cyan);
  color: var(--cyan);
  background: var(--cyan-soft);
}

.form-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  margin-top: 40px;
  padding-top: 28px;
  border-top: 1px dashed var(--line);
}
.form-fine {
  margin: 0;
  font-family: var(--mono);
  font-weight: 300;
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--paper-mute);
  line-height: 1.5;
  max-width: 380px;
}

.form-status {
  display: block;
  margin-top: 24px;
  font-family: var(--mono);
  font-weight: 400;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--paper-mute);
  min-height: 18px;
}
.form-status[data-state="success"] { color: var(--cyan); }
.form-status[data-state="error"]   { color: var(--magenta); }

/* =====================================================================
   LAPLACIAN HUD (live readout of the background graph's spectrum)
   ===================================================================== */

.lap-hud {
  position: fixed;
  bottom: 16px;
  left: 20px;
  z-index: 4;
  pointer-events: none;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 7px 14px;
  background: rgba(0, 2, 8, 0.5);
  border: 1px solid var(--line);
  border-radius: 999px;
  backdrop-filter: blur(8px) saturate(140%);
  -webkit-backdrop-filter: blur(8px) saturate(140%);
  font-family: var(--mono);
  font-weight: 400;
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--paper-mute);
  opacity: 0.85;
  transition: opacity .4s var(--ease);
}
.lap-hud-title {
  color: var(--cyan);
  font-weight: 500;
  letter-spacing: 0.20em;
}
.lap-hud-pair {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
}
.lap-hud-label {
  color: var(--paper-mute);
  font-weight: 400;
}
.lap-hud-val {
  color: var(--paper);
  font-weight: 500;
  letter-spacing: 0.02em;
  text-transform: none;
  min-width: 16px;
}
.lap-hud-sep {
  color: var(--paper-mute);
  opacity: 0.45;
}
.lap-hud.flash .lap-hud-val {
  animation: hudFlash 0.9s var(--ease-out);
}
@keyframes hudFlash {
  0%   { color: var(--cyan); text-shadow: 0 0 10px var(--cyan-glow); }
  100% { color: var(--paper); text-shadow: none; }
}

@media (max-width: 760px) { .lap-hud { display: none; } }

/* =====================================================================
   FOOTER
   ===================================================================== */

.foot {
  position: relative;
  z-index: 10;
  border-top: 1px solid var(--line);
  margin-top: clamp(40px, 6vw, 80px);
  padding: clamp(40px, 5vw, 64px) var(--pad-x) 32px;
  max-width: var(--shell-max);
  margin-inline: auto;
}

.foot-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 24px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

.foot-brand {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-family: var(--mono);
  font-weight: 300;
  font-size: 11.5px;
  letter-spacing: 0.04em;
}
.foot-name {
  font-size: 14px;
  letter-spacing: 0.20em;
  color: var(--cyan);
  text-shadow: 0 0 10px var(--cyan-glow);
}
.foot-dim { color: var(--paper-mute); }

.foot-meta {
  display: flex;
  flex-direction: column;
  gap: 6px;
  text-align: right;
  font-family: var(--mono);
  font-weight: 300;
  font-size: 11px;
  letter-spacing: 0.06em;
}

.foot-eq {
  font-family: var(--mono);
  font-weight: 300;
  font-size: 11px;
  color: var(--paper-mute);
  border-top: 1px dashed var(--line);
  padding-top: 16px;
  text-align: center;
  opacity: 0.7;
  letter-spacing: 0.06em;
}

/* =====================================================================
   REVEAL
   ===================================================================== */

.fade-up {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity .9s var(--ease-out), transform .9s var(--ease-out);
}
.fade-up.is-in { opacity: 1; transform: translateY(0); }

.hero-copy > * {
  opacity: 0;
  transform: translateY(20px);
  animation: heroIn .9s var(--ease-out) forwards;
}
.hero-copy > *:nth-child(1) { animation-delay: 0.10s; }
.hero-copy > *:nth-child(2) { animation-delay: 0.22s; }
.hero-copy > *:nth-child(3) { animation-delay: 0.34s; }
.hero-copy > *:nth-child(4) { animation-delay: 0.46s; }
.hero-copy > *:nth-child(5) { animation-delay: 0.58s; }
.hero-copy > *:nth-child(6) { animation-delay: 0.70s; }
@keyframes heroIn { to { opacity: 1; transform: translateY(0); } }

.instrument {
  opacity: 0;
  transform: perspective(2200px) rotateY(-2.5deg) rotateX(1deg) translateY(20px);
  animation: insIn 1.2s var(--ease-out) forwards;
  animation-delay: 0.4s;
}
@keyframes insIn {
  to {
    opacity: 1;
    transform: perspective(2200px) rotateY(-2.5deg) rotateX(1deg) translateY(0);
  }
}

.hero-tape {
  opacity: 0;
  animation: fadeIn 1s var(--ease-out) forwards;
  animation-delay: 1.1s;
}
@keyframes fadeIn { to { opacity: 1; } }

/* =====================================================================
   RESPONSIVE
   ===================================================================== */

@media (max-width: 1180px) {
  .pipeline {
    grid-template-columns: 1fr 1fr;
    gap: 14px 16px;
  }
  .step-arrow { display: none; }
}

@media (max-width: 1080px) {
  .hero-grid { grid-template-columns: 1fr; }
  .instrument { transform: none; margin-top: 24px; }
  .nav-links { display: none; }
  .nav { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 760px) {
  body { font-size: 16px; }

  .hero { padding-top: 120px; }
  .display { font-size: clamp(52px, 14vw, 96px); }

  .hero-meta { grid-template-columns: 1fr; gap: 18px; }

  .pipeline { grid-template-columns: 1fr; }

  .notes-grid { grid-template-columns: 1fr; }

  .form-grid { grid-template-columns: 1fr; gap: 22px; }
  .form-footer { flex-direction: column; align-items: stretch; gap: 18px; }
  .form-footer .btn { justify-content: center; }
  .form-fine { max-width: none; }

  .foot-row { flex-direction: column; align-items: flex-start; }
  .foot-meta { text-align: left; }

  .float-eq, .topo-glyphs { display: none; }
}

@media (max-width: 480px) {
  .nav-status .nav-status-text { display: none; }
  .display { font-size: clamp(46px, 16vw, 78px); }
  .ins-readout { grid-template-columns: auto 1fr auto 1fr; }
}

/* =====================================================================
   ACCESSIBILITY
   ===================================================================== */

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  #field { opacity: 0.25; }
  .float-eq span, .topo, .tape-track { animation: none; }
}

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