.card {
  --surface: rgba(10, 10, 26, 0.45);
  --cyan: #00f2fe;
  --cyan-dim: rgba(0, 242, 254, 0.08);
  --cyan-glow: rgba(0, 242, 254, 0.35);
  --green: #34d399;
  --green-dim: rgba(52, 211, 153, 0.08);
  --green-glow: rgba(52, 211, 153, 0.35);
  --purple: #c084fc;
  --purple-dim: rgba(192, 132, 252, 0.08);
  --purple-glow: rgba(192, 132, 252, 0.35);
  --amber: #fbbf24;
  --amber-dim: rgba(251, 191, 36, 0.06);
  --gray-dim: rgba(255, 255, 255, 0.02);
  --border-faint: var(--border-glass);
  --text: var(--text-primary);
  --text-muted: var(--text-secondary);
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  --font-head: inherit;

  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 670px;
  background: var(--surface);
  border: 1px solid var(--border-faint);
  border-radius: 24px;
  padding: 40px 40px 44px;
  backdrop-filter: blur(20px) saturate(160%);
  -webkit-backdrop-filter: blur(20px) saturate(160%);
  box-shadow:
    0 0 0 1px rgba(52, 211, 153, 0.06),
    0 24px 80px rgba(0, 0, 0, 0.45),
    inset 0 1px 1px rgba(255, 255, 255, 0.08);
  margin: 2.5rem auto;
  transition: box-shadow 0.3s ease;
}

.card:hover {
  box-shadow:
    0 0 0 1px rgba(52, 211, 153, 0.1),
    0 25px 90px rgba(0, 0, 0, 0.55),
    inset 0 1px 1px rgba(255, 255, 255, 0.12);
}

.card::before, .card::after {
  content: '';
  position: absolute;
  width: 24px; height: 24px;
  border-color: var(--green);
  border-style: solid;
}
.card::before { top:-1px; left:-1px; border-width:2px 0 0 2px; border-radius:24px 0 0 0; }
.card::after  { bottom:-1px; right:-1px; border-width:0 2px 2px 0; border-radius:0 0 24px 0; }

@keyframes scanline {
  0%   { top: 0;    opacity: 0.4; }
  100% { top: 100%; opacity: 0; }
}

.cardScanline {
  position: absolute; inset: 0;
  overflow: hidden; border-radius: 24px; pointer-events: none;
}
.cardScanline::after {
  content: '';
  position: absolute; left:0; right:0; height:80px;
  background: linear-gradient(to bottom, transparent, rgba(52, 211, 153, 0.02), transparent);
  animation: scanline 6s linear infinite;
}

.header { text-align: center; margin-bottom: 32px; }

.title {
  font-family: var(--font-head);
  font-size: 26px; font-weight: 800;
  letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--green);
  text-shadow: 0 0 15px var(--green-glow);
}

.subtitle {
  font-family: var(--font-mono);
  font-size: 11px; color: var(--text-muted);
  letter-spacing: 0.12em; margin-top: 8px;
  opacity: 0.8;
}

.divider {
  width: 100%; height: 1px;
  background: linear-gradient(90deg, transparent, var(--green-glow), transparent);
  margin-bottom: 28px;
}

/* ── pipeline ── */
.pipeline {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
}

/* ── generic layer ── */
.layer {
  width: 100%;
  border-radius: 12px;
  padding: 12px 18px;
  border: 1px solid transparent;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  position: relative;
}
.layer:hover { transform: scale(1.012) translateX(-2px); }

.layerName {
  font-family: var(--font-head);
  font-weight: 700; font-size: 14px;
  letter-spacing: 0.08em; text-transform: uppercase;
}

.layerDim {
  font-family: var(--font-mono);
  font-size: 10px; margin-top: 4px; letter-spacing: 0.04em;
  opacity: 0.85;
}

/* input */
.lInput {
  background: var(--cyan-dim);
  border-color: rgba(0, 242, 254, 0.3);
  box-shadow: 0 0 12px rgba(0, 242, 254, 0.05);
}
.lInput .layerName { color: var(--cyan); text-shadow: 0 0 10px var(--cyan-glow); }
.lInput .layerDim  { color: rgba(0, 242, 254, 0.7); }
.lInput:hover { box-shadow: 0 0 20px rgba(0, 242, 254, 0.15); }

/* convolutional */
.lConv {
  background: var(--green-dim);
  border-color: rgba(52, 211, 153, 0.3);
  border-left: 3px solid var(--green);
  border-radius: 0 12px 12px 0;
  box-shadow: 0 0 12px rgba(52, 211, 153, 0.05);
}
.lConv .layerName { color: var(--green); text-shadow: 0 0 10px var(--green-glow); }
.lConv .layerDim  { color: rgba(52, 211, 153, 0.7); }
.lConv:hover { box-shadow: -2px 0 16px rgba(52, 211, 153, 0.15); }

/* stage group header */
.stageGroup {
  width: 100%;
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-top: 8px;
}

.stageLabel {
  font-family: var(--font-mono);
  font-size: 9px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--green);
  opacity: 0.7;
  margin-bottom: 10px;
  align-self: flex-start;
}

/* individual bottleneck block */
.lBlock {
  background: var(--purple-dim);
  border-color: rgba(192, 132, 252, 0.25);
  box-shadow: 0 0 8px rgba(192, 132, 252, 0.03);
}
.lBlock .layerName { color: var(--purple); text-shadow: 0 0 8px var(--purple-glow); }
.lBlock .layerDim  { color: rgba(192, 132, 252, 0.7); }
.lBlock:hover { box-shadow: 0 0 16px rgba(192, 132, 252, 0.15); }

/* pooling / flatten */
.lPool {
  background: var(--gray-dim);
  border-color: rgba(255, 255, 255, 0.08);
  border-left: 3px solid var(--green);
  border-radius: 0 12px 12px 0;
}
.lPool .layerName { color: var(--text); }
.lPool .layerDim  { color: var(--text-muted); }
.lPool:hover { box-shadow: -2px 0 12px rgba(52, 211, 153, 0.12); }

.lFlatten {
  background: var(--amber-dim);
  border-color: rgba(251, 191, 36, 0.25);
  border-left: 3px solid var(--amber);
  border-radius: 0 12px 12px 0;
}
.lFlatten .layerName { color: var(--amber); }
.lFlatten .layerDim  { color: rgba(251, 191, 36, 0.7); }

/* output */
.lOutput {
  background: linear-gradient(135deg, rgba(192, 132, 252, 0.12), rgba(52, 211, 153, 0.06));
  border-color: rgba(192, 132, 252, 0.4);
  box-shadow: 0 0 16px rgba(192, 132, 252, 0.1), inset 0 1px 0 rgba(192, 132, 252, 0.1);
}
.lOutput .layerName { color: var(--purple); text-shadow: 0 0 12px var(--purple-glow); }
.lOutput .layerDim  { color: rgba(192, 132, 252, 0.75); }
.lOutput:hover { box-shadow: 0 0 24px rgba(192, 132, 252, 0.2); }

/* ── connector (main flow arrow) ── */
.conn {
  display: flex; align-items: center; justify-content: center;
  height: 24px; width: 100%; position: relative;
}
.connLine {
  width: 1.5px; height: 100%;
  background: linear-gradient(to bottom, var(--green), var(--purple));
  position: relative;
}
.connLine::after {
  content: '';
  position: absolute; bottom: -1px; left: 50%;
  transform: translateX(-50%);
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 6px solid var(--purple);
  filter: drop-shadow(0 0 2px var(--purple-glow));
}

.connSm { height: 16px; }

/* ── KD badge ── */
.kdBadge {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 24px;
  padding: 12px 20px;
  background: linear-gradient(135deg, rgba(0, 242, 254, 0.06), rgba(52, 211, 153, 0.04));
  border: 1px solid rgba(0, 242, 254, 0.2);
  border-radius: 12px;
}

.kdBadgeIcon {
  font-size: 20px;
  color: var(--cyan);
  flex-shrink: 0;
}

.kdBadgeText {
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ── legend ── */
.legend {
  display: flex; gap: 20px;
  justify-content: center;
  margin-top: 28px;
  flex-wrap: wrap;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 20px;
}
.legendItem {
  display: flex; align-items: center; gap: 8px;
  font-family: var(--font-mono); font-size: 10.5px; color: var(--text-muted);
}
.legDot { width:10px; height:10px; border-radius:3px; flex-shrink:0; }
.legCyan   { background:var(--cyan);   box-shadow:0 0 6px var(--cyan-glow); }
.legGreen  { background:var(--green);  box-shadow:0 0 6px var(--green-glow); }
.legPurple { background:var(--purple); box-shadow:0 0 6px var(--purple-glow); }
.legAmber  { background:var(--amber);  box-shadow:0 0 6px rgba(251, 191, 36, 0.3); }

/* ── entrance animations ── */
@keyframes fadeUp {
  from { opacity:0; transform:translateY(10px); }
  to   { opacity:1; transform:translateY(0); }
}
.layer, .stageGroup { animation: fadeUp 0.4s ease both; }

@media (max-width: 600px) {
  .card {
    padding: 28px 24px;
    border-radius: 16px;
  }
  .card::before { border-radius: 16px 0 0 0; }
  .card::after  { border-radius: 0 0 16px 0; }
  .title {
    font-size: 20px;
  }
  .layerName {
    font-size: 12px;
  }
  .layerDim {
    font-size: 9px;
  }
}