:root {
  --bg: #081218;
  --bg-soft: #10202b;
  --panel: rgba(8, 18, 24, 0.68);
  --panel-line: rgba(164, 211, 237, 0.16);
  --text: #ebf6ff;
  --muted: #8ea7b7;
  --accent-cold: #62d0ff;
  --accent-hot: #ff8f57;
  --accent-lime: #dfff7a;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.32);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  position: relative;
  overflow-x: hidden;
  font-family: "Noto Sans SC", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(98, 208, 255, 0.18), transparent 28%),
    radial-gradient(circle at 80% 18%, rgba(255, 143, 87, 0.18), transparent 24%),
    linear-gradient(140deg, #061017 0%, #0a161d 52%, #081218 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 120px 120px;
  opacity: 0.2;
  pointer-events: none;
}

.noise,
.frame {
  position: fixed;
  inset: 0;
  pointer-events: none;
}

.noise {
  opacity: 0.08;
  mix-blend-mode: screen;
  background-image:
    radial-gradient(circle at 20% 20%, rgba(255, 255, 255, 0.9) 0 0.6px, transparent 0.7px),
    radial-gradient(circle at 80% 65%, rgba(255, 255, 255, 0.8) 0 0.5px, transparent 0.6px),
    radial-gradient(circle at 45% 80%, rgba(255, 255, 255, 0.7) 0 0.5px, transparent 0.6px);
  background-size: 14px 14px, 17px 17px, 19px 19px;
}

.frame {
  inset: 20px;
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.topbar,
.layout,
.footer {
  position: relative;
  z-index: 1;
}

.topbar {
  max-width: 1280px;
  margin: 0 auto;
  padding: 32px 24px 0;
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: flex-start;
}

.brand {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.brand-mark {
  width: 18px;
  height: 18px;
  margin-top: 8px;
  background:
    linear-gradient(135deg, var(--accent-hot), transparent 55%),
    linear-gradient(315deg, var(--accent-cold), transparent 55%);
  box-shadow: 0 0 24px rgba(98, 208, 255, 0.4);
}

.topbar h1,
.intro h2,
.note h3 {
  margin: 0;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.topbar h1 {
  font-size: clamp(2rem, 3.2vw, 3.4rem);
}

.topline,
.lead,
.stage-copy p,
.note p,
.footer p {
  margin: 0;
  color: var(--muted);
  line-height: 1.7;
}

.topline {
  max-width: 320px;
  padding-top: 6px;
  text-align: right;
}

.eyebrow {
  margin: 0 0 10px;
  font-family: "Azeret Mono", monospace;
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  color: #b2d6ea;
  text-transform: uppercase;
}

.layout {
  max-width: 1280px;
  margin: 0 auto;
  padding: 26px 24px 48px;
  display: grid;
  grid-template-columns: minmax(300px, 0.9fr) minmax(340px, 1.1fr);
  gap: 22px;
}

.panel {
  border: 1px solid var(--panel-line);
  background: var(--panel);
  backdrop-filter: blur(18px);
  box-shadow: var(--shadow);
}

.intro,
.stage {
  min-height: 580px;
}

.intro {
  padding: 32px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.intro h2 {
  max-width: 11ch;
  font-size: clamp(2rem, 4vw, 4.4rem);
  line-height: 0.98;
}

.lead {
  margin-top: 18px;
  max-width: 48ch;
  font-size: 1.03rem;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.mode-btn {
  border: 1px solid rgba(255, 255, 255, 0.15);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  padding: 10px 18px;
  font: inherit;
  cursor: pointer;
  transition: background-color 180ms ease, border-color 180ms ease, transform 180ms ease;
}

.mode-btn:hover,
.mode-btn:focus-visible {
  transform: translateY(-2px);
  background: rgba(98, 208, 255, 0.08);
  border-color: rgba(98, 208, 255, 0.4);
  outline: none;
}

.mode-btn.is-active {
  background: linear-gradient(135deg, rgba(98, 208, 255, 0.2), rgba(255, 143, 87, 0.18));
  border-color: rgba(255, 255, 255, 0.3);
}

.metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 28px;
}

.metric-card {
  min-height: 96px;
  padding: 16px 16px 18px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.metric-card span,
.metric-card strong {
  display: block;
}

.metric-card span {
  color: var(--muted);
  font-size: 0.9rem;
}

.metric-card strong {
  margin-top: 18px;
  font-family: "Azeret Mono", monospace;
  font-size: clamp(1.2rem, 2.2vw, 1.7rem);
  letter-spacing: 0.04em;
}

.stage {
  position: relative;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.stage-copy {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: flex-end;
}

.stage-copy p:last-child {
  max-width: 34ch;
  text-align: right;
}

.pixel-shell {
  position: relative;
  flex: 1;
  min-height: 440px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background:
    radial-gradient(circle at center, rgba(98, 208, 255, 0.08), transparent 46%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0));
}

.scanline {
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.04) 0,
    rgba(255, 255, 255, 0.04) 1px,
    transparent 1px,
    transparent 10px
  );
  opacity: 0.2;
  pointer-events: none;
}

.pixel-field {
  position: absolute;
  inset: 0;
  display: grid;
  grid-template-columns: repeat(var(--cols, 28), minmax(0, 1fr));
  grid-template-rows: repeat(var(--rows, 18), minmax(0, 1fr));
  gap: 8px;
  padding: clamp(18px, 2vw, 24px);
}

.pixel {
  min-width: 0;
  min-height: 0;
  border-radius: 2px;
  background: rgba(98, 208, 255, 0.08);
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.02);
  transform: scale(var(--scale, 0.72));
  opacity: var(--alpha, 0.28);
  transition: transform 140ms linear, opacity 140ms linear, filter 140ms linear;
  filter: saturate(1.2) blur(0px);
}

.notes {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}

.note {
  min-height: 220px;
  padding: 24px;
}

.note h3 {
  margin-bottom: 12px;
  font-size: 1.45rem;
  line-height: 1.15;
}

.footer {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px 32px;
}

@media (max-width: 1040px) {
  .topbar,
  .layout {
    grid-template-columns: 1fr;
  }

  .topbar,
  .stage-copy {
    flex-direction: column;
  }

  .topline,
  .stage-copy p:last-child {
    text-align: left;
  }

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

@media (max-width: 720px) {
  .frame {
    inset: 12px;
  }

  .topbar {
    padding: 24px 18px 0;
  }

  .layout {
    padding: 18px 18px 36px;
    gap: 18px;
  }

  .intro,
  .stage,
  .note {
    padding: 20px;
  }

  .intro,
  .stage {
    min-height: auto;
  }

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

  .pixel-shell {
    min-height: 340px;
  }

  .pixel-field {
    gap: 6px;
    padding: 16px;
  }
}