/* CardioSpectra — launch site
   ──────────────────────────────────────────────────────────────
   Aesthetic: dark cinematic medtech. Bone-white on near-black,
   electric cyan primary, pulse-red secondary.
*/

:root {
  /* Backgrounds */
  --bg-0:        #14040a;
  --bg-1:        #1c0610;
  --bg-2:        #260a16;
  --bg-3:        #3a1224;
  --line:        rgba(255, 255, 255, 0.08);
  --line-strong: rgba(255, 255, 255, 0.16);

  /* Foreground */
  --fg:          #f4ece6;
  --fg-soft:     #c8b8b0;
  --fg-mute:     #7a625e;
  --fg-faint:    rgba(244, 236, 230, 0.35);

  /* Accents — oklch family */
  --accent:      oklch(72% 0.20 22);     /* electric crimson */
  --accent-deep: oklch(56% 0.22 18);
  --accent-glow: oklch(82% 0.22 22);
  --pulse:       oklch(72% 0.20 22);     /* warm pulse red */
  --signal-1:    oklch(78% 0.18 18);     /* optical — crimson */
  --signal-2:    oklch(70% 0.20 350);    /* impedance — magenta-red */
  --signal-3:    oklch(78% 0.18 50);     /* elastography — warm orange */

  /* Type */
  --font-sans: "Geist", "Inter", -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  --font-mono: "Geist Mono", "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;

  /* Layout */
  --max-w: 1400px;
  --gutter: clamp(20px, 4vw, 64px);
}

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

html, body {
  background: var(--bg-0);
  color: var(--fg);
  font-family: var(--font-sans);
  font-weight: 400;
  font-feature-settings: "ss01", "cv11";
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  position: relative;
  min-height: 100vh;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

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

/* ──────────────────────────────────────────────────────────────
   CANVAS — the fixed Three.js layer
   ────────────────────────────────────────────────────────────── */

#scene-canvas {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
}

/* Vignette + grain overlays */
.fx-vignette {
  position: fixed;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  background:
    radial-gradient(ellipse at center, transparent 40%, rgba(0,0,0,0.55) 100%);
  mix-blend-mode: multiply;
}

/* Left-side darkening gradient — protects text contrast against the
   bright 3D scene without obscuring the visualization on the right. */
.fx-text-shade {
  position: fixed;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  background:
    linear-gradient(to right,
      rgba(15, 4, 8, 0.78) 0%,
      rgba(15, 4, 8, 0.55) 28%,
      rgba(15, 4, 8, 0.15) 55%,
      rgba(15, 4, 8, 0.00) 78%);
}

/* Subtle dark glow behind large headlines for guaranteed legibility */
.h-display,
.h-display em,
.h-1,
.h-1 em,
.h-2 {
  text-shadow: 0 2px 28px rgba(15, 4, 8, 0.75),
               0 0 8px rgba(15, 4, 8, 0.5);
}

.lede {
  text-shadow: 0 1px 14px rgba(15, 4, 8, 0.6);
}

.fx-grain {
  position: fixed;
  inset: 0;
  z-index: 3;
  pointer-events: none;
  opacity: 0.06;
  mix-blend-mode: overlay;
  background-image:
    url("data:image/svg+xml;utf8,<svg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/></filter><rect width='100%25' height='100%25' filter='url(%23n)' opacity='0.55'/></svg>");
}

/* ──────────────────────────────────────────────────────────────
   NAV
   ────────────────────────────────────────────────────────────── */

.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  padding: 22px var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  backdrop-filter: blur(12px) saturate(140%);
  -webkit-backdrop-filter: blur(12px) saturate(140%);
  background: linear-gradient(to bottom, rgba(6,8,10,0.6), rgba(6,8,10,0));
  transition: background 0.5s ease, border-color 0.5s ease;
  border-bottom: 1px solid transparent;
}

.nav.is-scrolled {
  background: rgba(6,8,10,0.85);
  border-bottom-color: var(--line);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-transform: uppercase;
  font-weight: 500;
  letter-spacing: 0.18em;
  font-size: 13px;
  color: var(--fg);
}

.brand-mark {
  width: 22px;
  height: 22px;
  position: relative;
  display: inline-block;
}

.brand-mark svg {
  width: 100%;
  height: 100%;
}

.nav-links {
  display: flex;
  gap: 32px;
  align-items: center;
}

.nav-links a {
  color: var(--fg-soft);
  text-transform: uppercase;
  transition: color 0.2s ease;
  position: relative;
  padding: 6px 0;
}

.nav-links a:hover {
  color: var(--fg);
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.3s ease;
}

.nav-links a:hover::after { transform: scaleX(1); }

.nav-cta {
  border: 1px solid var(--line-strong);
  padding: 8px 16px;
  border-radius: 100px;
  color: var(--fg);
  text-transform: uppercase;
  font-size: 11px;
  letter-spacing: 0.1em;
  transition: all 0.2s ease;
}

.nav-cta:hover {
  border-color: var(--accent);
  background: color-mix(in oklch, var(--accent) 12%, transparent);
  color: var(--accent-glow);
}

/* ──────────────────────────────────────────────────────────────
   SECTION SHELL
   ────────────────────────────────────────────────────────────── */

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

section {
  position: relative;
  width: 100%;
  padding: 0 var(--gutter);
  display: flex;
  align-items: center;
}

section.full {
  min-height: 100vh;
}

.section-inner {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  position: relative;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.eyebrow::before {
  content: "";
  width: 18px;
  height: 1px;
  background: var(--accent);
  opacity: 0.7;
}

.h-display {
  font-family: var(--font-sans);
  font-weight: 400;
  font-size: clamp(48px, 8vw, 128px);
  line-height: 0.95;
  letter-spacing: -0.03em;
  color: var(--fg);
  text-wrap: balance;
}

.h-display em {
  font-style: normal;
  color: var(--fg-soft);
  font-weight: 300;
}

.h-1 {
  font-size: clamp(36px, 5.5vw, 84px);
  line-height: 0.98;
  letter-spacing: -0.025em;
  font-weight: 400;
  text-wrap: balance;
}

.h-2 {
  font-size: clamp(28px, 3.5vw, 48px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  font-weight: 500;
  text-wrap: balance;
}

.h-3 {
  font-size: clamp(20px, 1.8vw, 26px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  font-weight: 500;
}

.lede {
  font-size: clamp(17px, 1.4vw, 22px);
  line-height: 1.45;
  color: var(--fg-soft);
  font-weight: 300;
  max-width: 56ch;
  text-wrap: pretty;
}

.body {
  font-size: 16px;
  line-height: 1.6;
  color: var(--fg-soft);
  max-width: 60ch;
}

.mono {
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--fg-mute);
}

/* ──────────────────────────────────────────────────────────────
   HERO
   ────────────────────────────────────────────────────────────── */

.hero {
  min-height: 100vh;
  padding-top: 25vh;
  padding-bottom: 8vh;
}

.hero-eyebrow {
  margin-bottom: 28px;
}

.hero-title {
  margin-bottom: 36px;
}

.hero-meta {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 48px);
  margin-top: clamp(120px, 18vh, 220px);
  padding-top: 28px;
  border-top: 1px solid var(--line);
  max-width: 1100px;
}

.hero-meta-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.hero-meta-label {
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--fg-mute);
}

.hero-meta-value {
  font-size: 15px;
  color: var(--fg);
  font-weight: 400;
  letter-spacing: -0.01em;
}

.hero-meta-value .small {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-soft);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-left: 4px;
}

.scroll-cue {
  position: absolute;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--fg-mute);
  opacity: 0.7;
}

.scroll-cue-line {
  width: 1px;
  height: 36px;
  background: linear-gradient(to bottom, transparent, var(--fg-soft));
  animation: scroll-cue-pulse 2.4s ease-in-out infinite;
}

@keyframes scroll-cue-pulse {
  0%, 100% { opacity: 0.3; transform: scaleY(0.6); transform-origin: top; }
  50% { opacity: 1; transform: scaleY(1); }
}

/* ──────────────────────────────────────────────────────────────
   PROBLEM — stat-driven section
   ────────────────────────────────────────────────────────────── */

.problem {
  padding-top: 18vh;
  padding-bottom: 18vh;
}

.problem-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(40px, 6vw, 120px);
  align-items: flex-start;
}

.problem-stats {
  display: grid;
  gap: 24px;
  margin-top: 12px;
}

.stat-row {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 24px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
  align-items: baseline;
}

.stat-row:last-child {
  border-bottom: 1px solid var(--line);
}

.stat-num {
  font-family: var(--font-sans);
  font-size: 36px;
  font-weight: 400;
  letter-spacing: -0.03em;
  color: var(--fg);
  line-height: 1;
}

.stat-num .unit {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent);
  margin-left: 4px;
  letter-spacing: 0.08em;
}

.stat-label {
  font-size: 14px;
  color: var(--fg-soft);
  line-height: 1.4;
}

.stat-label cite {
  display: block;
  font-family: var(--font-mono);
  font-style: normal;
  font-size: 10px;
  color: var(--fg-mute);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-top: 6px;
}

/* ──────────────────────────────────────────────────────────────
   CATHETER — tri-modal anatomy
   ────────────────────────────────────────────────────────────── */

.catheter {
  padding-top: 20vh;
  padding-bottom: 20vh;
}

.catheter-header {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  margin-bottom: 80px;
  align-items: flex-end;
}

.tri-modal {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 60px;
}

.modal-card {
  position: relative;
  background: linear-gradient(180deg, rgba(255,255,255,0.025), rgba(255,255,255,0.005));
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 28px 24px 24px;
  min-height: 320px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  isolation: isolate;
}

.modal-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 0%, var(--modal-glow), transparent 70%);
  opacity: 0.6;
  z-index: -1;
}

.modal-card[data-modal="optical"]     { --modal-glow: color-mix(in oklch, var(--signal-1) 25%, transparent); }
.modal-card[data-modal="impedance"]   { --modal-glow: color-mix(in oklch, var(--signal-2) 25%, transparent); }
.modal-card[data-modal="elasto"]      { --modal-glow: color-mix(in oklch, var(--signal-3) 25%, transparent); }

.modal-idx {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-mute);
  letter-spacing: 0.1em;
  margin-bottom: 18px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.modal-idx-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
}

[data-modal="optical"] .modal-idx-dot   { background: var(--signal-1); box-shadow: 0 0 12px var(--signal-1); }
[data-modal="impedance"] .modal-idx-dot { background: var(--signal-2); box-shadow: 0 0 12px var(--signal-2); }
[data-modal="elasto"] .modal-idx-dot    { background: var(--signal-3); box-shadow: 0 0 12px var(--signal-3); }

.modal-name {
  font-size: 24px;
  letter-spacing: -0.015em;
  font-weight: 500;
  margin-bottom: 4px;
  line-height: 1.1;
}

.modal-sub {
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--fg-mute);
  margin-bottom: 24px;
}

.modal-body {
  font-size: 14px;
  line-height: 1.55;
  color: var(--fg-soft);
  margin-bottom: 20px;
}

.modal-spec {
  margin-top: auto;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  display: grid;
  gap: 6px;
}

.modal-spec-row {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
}

.modal-spec-row .k { color: var(--fg-mute); text-transform: uppercase; }
.modal-spec-row .v { color: var(--fg); }

.spec-table {
  margin-top: 80px;
  border-top: 1px solid var(--line);
}

.spec-row {
  display: grid;
  grid-template-columns: 160px 1fr 1fr 1fr;
  border-bottom: 1px solid var(--line);
  padding: 18px 0;
  font-size: 14px;
  align-items: baseline;
}

.spec-row.head {
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--fg-mute);
}

.spec-row .k { color: var(--fg); font-weight: 500; }
.spec-row .v { color: var(--fg-soft); }

/* ──────────────────────────────────────────────────────────────
   FUSIONSUITE — software section
   ────────────────────────────────────────────────────────────── */

.fusion {
  padding-top: 22vh;
  padding-bottom: 18vh;
}

.fusion-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(40px, 6vw, 120px);
  align-items: center;
}

.fusion-points {
  margin-top: 40px;
  display: grid;
  gap: 4px;
}

.fp {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 24px;
  padding: 20px 0;
  border-top: 1px solid var(--line);
  align-items: flex-start;
}

.fp:last-child { border-bottom: 1px solid var(--line); }

.fp-num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent);
  letter-spacing: 0.12em;
  padding-top: 4px;
}

.fp-title {
  font-size: 18px;
  font-weight: 500;
  letter-spacing: -0.01em;
  margin-bottom: 6px;
  color: var(--fg);
}

.fp-body {
  font-size: 14px;
  line-height: 1.5;
  color: var(--fg-soft);
}

.fusion-viz {
  position: relative;
  aspect-ratio: 1;
  border: 1px solid var(--line);
  border-radius: 6px;
  background:
    radial-gradient(ellipse at center, rgba(91, 192, 235, 0.06), transparent 70%),
    repeating-linear-gradient(0deg, rgba(255,255,255,0.025) 0 1px, transparent 1px 60px),
    repeating-linear-gradient(90deg, rgba(255,255,255,0.025) 0 1px, transparent 1px 60px);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.fusion-viz::after {
  content: "FUSIONSUITE · LIVE";
  position: absolute;
  top: 16px;
  left: 16px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--accent);
  text-transform: uppercase;
}

.fusion-viz svg {
  width: 80%;
  height: 80%;
  opacity: 0.9;
}

/* ──────────────────────────────────────────────────────────────
   NEXUS — federated network
   ────────────────────────────────────────────────────────────── */

.nexus {
  padding-top: 22vh;
  padding-bottom: 22vh;
}

.nexus-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(40px, 6vw, 120px);
  align-items: flex-start;
}

.nexus-numbers {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin-top: 48px;
}

.nexus-num {
  background: var(--bg-0);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.nexus-num-val {
  font-size: 40px;
  font-weight: 400;
  letter-spacing: -0.02em;
  color: var(--fg);
  line-height: 1;
}

.nexus-num-val .small {
  font-size: 16px;
  color: var(--fg-soft);
  margin-left: 4px;
}

.nexus-num-lbl {
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--fg-mute);
}

/* ──────────────────────────────────────────────────────────────
   PIPELINE — timeline
   ────────────────────────────────────────────────────────────── */

.pipeline {
  padding-top: 22vh;
  padding-bottom: 18vh;
}

.pipeline-header {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: flex-end;
  margin-bottom: 80px;
}

.timeline {
  position: relative;
  margin-top: 40px;
}

.timeline-track {
  position: absolute;
  left: 0; right: 0;
  top: 50px;
  height: 1px;
  background: var(--line);
}

.timeline-track::after {
  content: "";
  position: absolute;
  left: 0; top: 0;
  width: var(--progress, 28%);
  height: 1px;
  background: linear-gradient(to right, var(--accent), var(--accent-glow));
  box-shadow: 0 0 12px var(--accent);
}

.timeline-row {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}

.tl-step {
  position: relative;
  padding-top: 80px;
  padding-right: 20px;
}

.tl-step::before {
  content: "";
  position: absolute;
  left: 0;
  top: 44px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--bg-0);
  border: 1px solid var(--line-strong);
  z-index: 2;
}

.tl-step.done::before {
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 0 16px var(--accent), 0 0 4px var(--accent);
}

.tl-step.now::before {
  background: var(--accent);
  border-color: var(--accent-glow);
  box-shadow: 0 0 24px var(--accent), 0 0 0 6px color-mix(in oklch, var(--accent) 18%, transparent);
  animation: tl-pulse 2.4s ease-in-out infinite;
}

@keyframes tl-pulse {
  0%, 100% { box-shadow: 0 0 24px var(--accent), 0 0 0 6px color-mix(in oklch, var(--accent) 18%, transparent); }
  50%      { box-shadow: 0 0 32px var(--accent), 0 0 0 14px color-mix(in oklch, var(--accent) 0%, transparent); }
}

.tl-when {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 8px;
}

.tl-step:not(.done):not(.now) .tl-when { color: var(--fg-mute); }

.tl-title {
  font-size: 17px;
  font-weight: 500;
  letter-spacing: -0.01em;
  margin-bottom: 6px;
  color: var(--fg);
}

.tl-body {
  font-size: 13px;
  line-height: 1.5;
  color: var(--fg-soft);
}

/* ──────────────────────────────────────────────────────────────
   TEAM
   ────────────────────────────────────────────────────────────── */

.team {
  padding-top: 22vh;
  padding-bottom: 14vh;
}

.team-header {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  margin-bottom: 80px;
  align-items: flex-end;
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 24px;
}

@media (max-width: 1280px) {
  .team-grid { grid-template-columns: repeat(3, 1fr); }
}

.member {
  display: flex;
  flex-direction: column;
}

.member-portrait {
  aspect-ratio: 3/4;
  background:
    repeating-linear-gradient(135deg, rgba(255,255,255,0.04) 0 2px, transparent 2px 12px),
    linear-gradient(180deg, var(--bg-2), var(--bg-1));
  border: 1px solid var(--line);
  margin-bottom: 20px;
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: flex-end;
  justify-content: flex-start;
  padding: 16px;
}

.member-portrait::before {
  content: attr(data-init);
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -55%);
  font-family: var(--font-mono);
  font-size: 64px;
  font-weight: 300;
  color: var(--fg-mute);
  letter-spacing: -0.02em;
  opacity: 0.6;
}

.member-portrait::after {
  content: "[PORTRAIT]";
  position: relative;
  z-index: 1;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  color: var(--fg-mute);
}

.member-name {
  font-size: 18px;
  font-weight: 500;
  letter-spacing: -0.01em;
  margin-bottom: 4px;
  color: var(--fg);
}

.member-role {
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 10px;
}

.member-bio {
  font-size: 13px;
  line-height: 1.5;
  color: var(--fg-soft);
}

/* ──────────────────────────────────────────────────────────────
   CTA / INVESTORS / CONTACT
   ────────────────────────────────────────────────────────────── */

.cta {
  padding-top: 22vh;
  padding-bottom: 22vh;
  text-align: left;
}

.cta-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
}

.cta-cards {
  display: grid;
  gap: 16px;
  margin-top: 40px;
}

.cta-card {
  border: 1px solid var(--line);
  padding: 32px 28px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px;
  align-items: center;
  transition: border-color 0.3s ease, background 0.3s ease;
  cursor: pointer;
  background: rgba(255,255,255,0.01);
}

.cta-card:hover {
  border-color: var(--accent);
  background: color-mix(in oklch, var(--accent) 5%, transparent);
}

.cta-card-title {
  font-size: 22px;
  font-weight: 500;
  letter-spacing: -0.015em;
  color: var(--fg);
  margin-bottom: 4px;
}

.cta-card-sub {
  font-size: 13px;
  color: var(--fg-soft);
}

.cta-card-arrow {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
}

.cta-card:hover .cta-card-arrow {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--bg-0);
  transform: translateX(4px);
}

/* ──────────────────────────────────────────────────────────────
   FOOTER
   ────────────────────────────────────────────────────────────── */

footer {
  background: var(--bg-1);
  position: relative;
  z-index: 12;
  padding: 80px var(--gutter) 40px;
  border-top: 1px solid var(--line);
}

.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 60px;
  padding-bottom: 60px;
  border-bottom: 1px solid var(--line);
}

.footer-brand {
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 24px;
  letter-spacing: -0.015em;
  margin-bottom: 12px;
}

.footer-tag {
  font-size: 14px;
  color: var(--fg-soft);
  max-width: 32ch;
  line-height: 1.5;
}

.footer-col-title {
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--fg-mute);
  margin-bottom: 20px;
}

.footer-col-list {
  list-style: none;
  display: grid;
  gap: 12px;
}

.footer-col-list a {
  font-size: 14px;
  color: var(--fg-soft);
  transition: color 0.2s ease;
}

.footer-col-list a:hover { color: var(--accent); }

.footer-bottom {
  margin-top: 36px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-mute);
  letter-spacing: 0.06em;
  flex-wrap: wrap;
  gap: 16px;
}

.disclaimer {
  margin-top: 24px;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--fg-mute);
  line-height: 1.6;
  max-width: 92ch;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* ──────────────────────────────────────────────────────────────
   BUTTONS / PILLS
   ────────────────────────────────────────────────────────────── */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 22px;
  border-radius: 100px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  transition: all 0.2s ease;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--accent);
  color: var(--bg-0);
}

.btn-primary:hover {
  background: var(--accent-glow);
  box-shadow: 0 0 32px color-mix(in oklch, var(--accent) 40%, transparent);
}

.btn-ghost {
  border-color: var(--line-strong);
  color: var(--fg);
}

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent-glow);
}

.btn-row {
  display: flex;
  gap: 12px;
  margin-top: 36px;
  flex-wrap: wrap;
}

/* Section-progress floating indicator */
.section-progress {
  position: fixed;
  bottom: 40px;
  right: 40px;
  z-index: 40;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-mute);
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 10px 14px;
  background: rgba(6, 8, 10, 0.6);
  backdrop-filter: blur(12px);
  border: 1px solid var(--line);
  border-radius: 100px;
  pointer-events: none;
}

.section-progress-bar {
  width: 80px;
  height: 1px;
  background: var(--line);
  position: relative;
  overflow: hidden;
}

.section-progress-bar::after {
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: var(--p, 0%);
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent);
  transition: width 0.2s linear;
}

/* ──────────────────────────────────────────────────────────────
   INLINE CITATIONS
   ────────────────────────────────────────────────────────────── */

.ref {
  font-family: var(--font-mono);
  font-size: 0.55em;
  color: var(--accent);
  vertical-align: super;
  margin-left: 2px;
  letter-spacing: 0;
  line-height: 1;
}

.ref a {
  color: inherit;
  text-decoration: none;
  padding: 1px 4px;
  border-radius: 3px;
  transition: background 0.2s ease;
}

.ref a:hover {
  background: color-mix(in oklch, var(--accent) 18%, transparent);
  color: var(--accent-glow);
}

/* ──────────────────────────────────────────────────────────────
   EVIDENCE — literature support
   ────────────────────────────────────────────────────────────── */

.evidence {
  padding-top: 22vh;
  padding-bottom: 18vh;
}

.evidence-header {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  margin-bottom: 80px;
  align-items: flex-end;
}

.evidence-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: clamp(40px, 5vw, 80px) clamp(40px, 6vw, 90px);
}

.evidence-group {
  display: flex;
  flex-direction: column;
}

.evidence-group-title {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 8px;
}

.evidence-list {
  list-style: none;
  display: grid;
  margin: 0;
  padding: 0;
}

.evidence-list li {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 20px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
  align-items: flex-start;
  scroll-margin-top: 100px;
}

.evidence-list li:last-child { border-bottom: none; }

.evidence-list li:target {
  background: color-mix(in oklch, var(--accent) 6%, transparent);
  border-color: var(--accent);
  border-radius: 4px;
  padding-left: 12px;
  padding-right: 12px;
  transition: background 0.4s ease;
}

.ref-num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent);
  letter-spacing: 0.08em;
  padding-top: 2px;
}

.ref-body {
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--fg-soft);
}

.ref-body strong {
  font-weight: 500;
  color: var(--fg);
  font-size: 14px;
  display: block;
  margin-bottom: 4px;
  letter-spacing: -0.005em;
}

.ref-body em {
  font-style: normal;
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--fg-mute);
  display: block;
  margin-top: 6px;
}

@media (max-width: 920px) {
  .evidence-header,
  .evidence-grid { grid-template-columns: 1fr; }
}

@media (max-width: 920px) {
  .hero-meta { grid-template-columns: repeat(2, 1fr); }
  .problem-grid,
  .fusion-grid,
  .nexus-grid,
  .pipeline-header,
  .team-header,
  .catheter-header,
  .cta-grid { grid-template-columns: 1fr; }
  .tri-modal { grid-template-columns: 1fr; }
  .team-grid { grid-template-columns: repeat(2, 1fr); }
  .timeline-row { grid-template-columns: 1fr; gap: 24px; }
  .timeline-track { display: none; }
  .tl-step { padding-top: 16px; padding-left: 32px; }
  .tl-step::before { top: 24px; left: 0; }
  .footer-top { grid-template-columns: 1fr 1fr; }
  .nexus-numbers { grid-template-columns: 1fr; }
  .nav-links a:not(.nav-cta) { display: none; }
  .spec-row { grid-template-columns: 1fr 1fr; }
  .spec-row > :nth-child(3),
  .spec-row > :nth-child(4) { display: none; }
  .section-progress { bottom: 16px; right: 16px; }
}