:root {
  --navy-deep: #061539;
  --navy: #0A2463;
  --navy-mid: #0E3082;
  --cyan: #E8F1F2;
  --cyan-accent: #4DC9F6;
  --red: #FB3640;
  --white: #FAFCFD;
  --gray-100: #F0F4F8;
  --gray-200: #D9E2EC;
  --gray-400: #9FB3C8;
  --gray-600: #627D98;
  --gray-800: #334E68;
  --mono: 'SF Mono', 'Fira Code', 'JetBrains Mono', monospace;
  --sans: -apple-system, BlinkMacSystemFont, 'Inter', 'Segoe UI', sans-serif;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--sans);
  background: var(--navy-deep);
  color: var(--cyan);
  line-height: 1.6;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-weight: 500;
  letter-spacing: -0.02em;
}

a {
  color: var(--cyan-accent);
  text-decoration: none;
  transition: color 0.2s;
}
a:hover { color: var(--white); }
a:focus {
  outline: 2px solid var(--cyan-accent);
  outline-offset: 2px;
}

section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 120px 40px;
}

section h2 {
  font-size: 2rem;
  margin-bottom: 16px;
  color: var(--white);
  font-weight: 300;
}

.section-desc {
  color: var(--gray-400);
  max-width: 640px;
  margin-bottom: 48px;
}

/* ═══════════════════════════════════════════════════════════════════════════
   1. HERO
   ═══════════════════════════════════════════════════════════════════════════ */

#hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 80px 40px;
  max-width: none;
  overflow: hidden;
}

.pcb-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 30%, rgba(77, 201, 246, 0.04) 0%, transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(251, 54, 64, 0.02) 0%, transparent 50%);
  pointer-events: none;
}

.pcb-bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(
      0deg,
      transparent 0,
      transparent 60px,
      rgba(77, 201, 246, 0.02) 60px,
      rgba(77, 201, 246, 0.02) 62px
    ),
    repeating-linear-gradient(
      90deg,
      transparent 0,
      transparent 60px,
      rgba(77, 201, 246, 0.02) 60px,
      rgba(77, 201, 246, 0.02) 62px
    );
  animation: pcb-flow 20s linear infinite;
}

@keyframes pcb-flow {
  from { transform: translate(0, 0); }
  to { transform: translate(60px, 60px); }
}

@media (prefers-reduced-motion: reduce) {
  .pcb-bg::before { animation: none; }
}

.grid-overlay {
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at center, transparent 40%, var(--navy-deep) 100%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
}

#hero h1 {
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: 300;
  color: var(--white);
  letter-spacing: 0.1em;
  margin-bottom: 16px;
}

.accent { color: var(--cyan-accent); }

.tagline {
  font-size: 1.5rem;
  color: var(--cyan);
  font-weight: 300;
  margin-bottom: 24px;
  line-height: 1.4;
}

.subtitle {
  color: var(--gray-400);
  font-size: 1rem;
  margin-bottom: 48px;
  line-height: 1.8;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 64px;
}

.btn {
  padding: 12px 28px;
  border-radius: 4px;
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  transition: all 0.2s;
  display: inline-block;
  cursor: pointer;
  border: none;
  font-family: var(--sans);
}

.btn-primary {
  background: var(--cyan-accent);
  color: var(--navy-deep);
}
.btn-primary:hover {
  background: var(--white);
  color: var(--navy-deep);
}

.btn-secondary {
  background: rgba(77, 201, 246, 0.1);
  color: var(--cyan-accent);
  border: 1px solid rgba(77, 201, 246, 0.3);
}
.btn-secondary:hover {
  background: rgba(77, 201, 246, 0.2);
  color: var(--white);
}

.btn-outline {
  background: transparent;
  color: var(--gray-400);
  border: 1px solid var(--gray-600);
}
.btn-outline:hover {
  color: var(--white);
  border-color: var(--white);
}

.hero-stack {
  display: flex;
  gap: 32px;
  justify-content: center;
  flex-wrap: wrap;
}

.stack-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.stack-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--gray-600);
}

.stack-tech {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--cyan-accent);
}

/* ═══════════════════════════════════════════════════════════════════════════
   2. LIVE PROCESSOR
   ═══════════════════════════════════════════════════════════════════════════ */

#live-processor {
  background: var(--navy);
  max-width: none;
  padding: 120px 40px;
}

#live-processor h2, #live-processor .section-desc {
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
}

.processor-lab {
  max-width: 1200px;
  margin: 0 auto;
}

.lab-controls {
  display: flex;
  gap: 12px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.ctrl-btn {
  padding: 8px 20px;
  background: rgba(77, 201, 246, 0.08);
  border: 1px solid rgba(77, 201, 246, 0.2);
  color: var(--cyan);
  font-family: var(--mono);
  font-size: 0.8rem;
  border-radius: 3px;
  cursor: pointer;
  transition: all 0.15s;
}
.ctrl-btn:hover {
  background: rgba(77, 201, 246, 0.15);
  border-color: var(--cyan-accent);
}
.ctrl-btn:focus {
  outline: 2px solid var(--cyan-accent);
  outline-offset: 2px;
}
.ctrl-btn.ctrl-accent {
  border-color: rgba(251, 54, 64, 0.3);
  color: var(--red);
}
.ctrl-btn.ctrl-accent:hover {
  background: rgba(251, 54, 64, 0.1);
  border-color: var(--red);
}

.pipeline-stages {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 20px;
  overflow-x: auto;
  padding: 20px 0;
}

.stage {
  position: relative;
  min-width: 140px;
  padding: 24px 16px;
  background: rgba(77, 201, 246, 0.04);
  border: 1px solid rgba(77, 201, 246, 0.15);
  border-radius: 6px;
  text-align: center;
  transition: all 0.3s;
}

.stage.active {
  border-color: var(--cyan-accent);
  background: rgba(77, 201, 246, 0.08);
  box-shadow: 0 0 20px rgba(77, 201, 246, 0.15);
  animation: stage-pulse 1s ease-in-out;
}

@keyframes stage-pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.02); }
}

@media (prefers-reduced-motion: reduce) {
  .stage.active { animation: none; }
}

.stage.hazard {
  border-color: var(--red);
  background: rgba(251, 54, 64, 0.08);
  box-shadow: 0 0 20px rgba(251, 54, 64, 0.15);
}

.stage.flushed {
  border-color: var(--gray-600);
  background: rgba(99, 125, 152, 0.05);
  opacity: 0.5;
}

.stage-header {
  font-family: var(--mono);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 4px;
}

.stage-body {
  font-size: 0.75rem;
  color: var(--gray-400);
  margin-bottom: 12px;
}

.stage-slot {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--cyan-accent);
  min-height: 1.2em;
}

.stage-arrow {
  font-family: var(--mono);
  color: var(--gray-600);
  font-size: 1.2rem;
}

.forwarding-svg {
  margin-bottom: 40px;
  display: block;
}

.fwd-line {
  stroke: var(--cyan-accent);
  stroke-width: 2;
  opacity: 0;
  transition: opacity 0.3s;
}

.fwd-line.active {
  opacity: 1;
  animation: fwd-flow 0.5s ease-in-out;
}

@keyframes fwd-flow {
  from { stroke-dasharray: 100; stroke-dashoffset: 100; }
  to { stroke-dasharray: 100; stroke-dashoffset: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .fwd-line.active { animation: none; }
}

.lab-panels {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-bottom: 40px;
}

.lab-panel {
  background: rgba(77, 201, 246, 0.04);
  border: 1px solid rgba(77, 201, 246, 0.15);
  border-radius: 6px;
  padding: 20px;
}

.lab-panel h3 {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--white);
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.registers-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  font-family: var(--mono);
  font-size: 0.75rem;
}

.register-item {
  display: flex;
  justify-content: space-between;
  padding: 4px 8px;
  background: rgba(77, 201, 246, 0.05);
  border-radius: 3px;
}

.reg-name { color: var(--gray-400); }
.reg-value { color: var(--cyan-accent); }

.queue-list {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--gray-400);
}

.queue-item {
  padding: 4px 0;
  border-bottom: 1px solid rgba(77, 201, 246, 0.05);
}

.queue-item.next {
  color: var(--cyan-accent);
  font-weight: 600;
}

#waveform-canvas {
  width: 100%;
  height: 200px;
  display: block;
}

.lab-stats {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
}

.stat-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--gray-600);
}

.stat-item span:last-child {
  font-family: var(--mono);
  font-size: 1rem;
  color: var(--white);
}

/* ═══════════════════════════════════════════════════════════════════════════
   3. WHY ORTHO32
   ═══════════════════════════════════════════════════════════════════════════ */

.cards-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.card {
  padding: 40px 32px;
  background: rgba(77, 201, 246, 0.03);
  border: 1px solid rgba(77, 201, 246, 0.1);
  border-radius: 8px;
  transition: border-color 0.3s;
}
.card:hover {
  border-color: rgba(77, 201, 246, 0.3);
}

.card-icon {
  margin-bottom: 16px;
  color: var(--cyan-accent);
}

.card-icon svg {
  width: 48px;
  height: 48px;
}

.card h3 {
  font-size: 1.1rem;
  color: var(--white);
  margin-bottom: 12px;
}

.card p {
  color: var(--gray-400);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* ═══════════════════════════════════════════════════════════════════════════
   4. ISA EXPLORER
   ═══════════════════════════════════════════════════════════════════════════ */

#isa-explorer {
  background: var(--navy);
  max-width: none;
  padding: 120px 40px;
}

#isa-explorer h2, #isa-explorer .section-desc {
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
}

.isa-container {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 32px;
  min-height: 500px;
}

.isa-sidebar {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.isa-search {
  width: 100%;
  padding: 10px 16px;
  background: rgba(77, 201, 246, 0.05);
  border: 1px solid rgba(77, 201, 246, 0.2);
  border-radius: 4px;
  color: var(--cyan);
  font-family: var(--mono);
  font-size: 0.85rem;
}
.isa-search::placeholder {
  color: var(--gray-600);
}
.isa-search:focus {
  outline: 2px solid var(--cyan-accent);
  outline-offset: 0;
  border-color: var(--cyan-accent);
}

.isa-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
  overflow-y: auto;
  max-height: 600px;
}

.isa-item {
  padding: 12px 16px;
  background: rgba(77, 201, 246, 0.04);
  border: 1px solid rgba(77, 201, 246, 0.1);
  border-radius: 4px;
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--cyan);
  cursor: pointer;
  transition: all 0.2s;
}
.isa-item:hover {
  background: rgba(77, 201, 246, 0.08);
  border-color: rgba(77, 201, 246, 0.3);
}
.isa-item.active {
  background: rgba(77, 201, 246, 0.12);
  border-color: var(--cyan-accent);
  color: var(--white);
}
.isa-item:focus {
  outline: 2px solid var(--cyan-accent);
  outline-offset: 2px;
}

.isa-detail {
  background: rgba(77, 201, 246, 0.04);
  border: 1px solid rgba(77, 201, 246, 0.15);
  border-radius: 6px;
  padding: 32px;
  min-height: 500px;
}

.isa-placeholder {
  color: var(--gray-600);
  font-style: italic;
  text-align: center;
  padding: 80px 0;
}

.isa-detail-content h3 {
  font-size: 1.5rem;
  color: var(--white);
  margin-bottom: 8px;
  font-family: var(--mono);
}

.isa-detail-content .isa-mnemonic {
  font-size: 0.85rem;
  color: var(--gray-400);
  margin-bottom: 32px;
}

.isa-section {
  margin-bottom: 32px;
}

.isa-section h4 {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--cyan-accent);
  margin-bottom: 12px;
  font-weight: 500;
}

.isa-encoding {
  display: flex;
  gap: 2px;
  margin-bottom: 8px;
}

.encoding-field {
  padding: 8px;
  text-align: center;
  font-family: var(--mono);
  font-size: 0.75rem;
  border-radius: 3px;
}

.encoding-field.opcode {
  background: rgba(77, 201, 246, 0.2);
  color: var(--white);
}
.encoding-field.rd {
  background: rgba(251, 54, 64, 0.2);
  color: var(--white);
}
.encoding-field.rs1 {
  background: rgba(159, 179, 200, 0.2);
  color: var(--white);
}
.encoding-field.rs2 {
  background: rgba(159, 179, 200, 0.2);
  color: var(--white);
}
.encoding-field.imm {
  background: rgba(77, 201, 246, 0.1);
  color: var(--gray-400);
}

.encoding-label {
  font-size: 0.7rem;
  color: var(--gray-600);
  display: block;
  margin-top: 4px;
}

.isa-latency {
  font-family: var(--mono);
  font-size: 1rem;
  color: var(--white);
}

.isa-execution {
  display: flex;
  gap: 8px;
}

.exec-stage {
  padding: 6px 12px;
  background: rgba(77, 201, 246, 0.1);
  border-radius: 3px;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--cyan-accent);
}

.isa-theorem {
  background: rgba(77, 201, 246, 0.05);
  padding: 16px;
  border-left: 3px solid var(--cyan-accent);
  border-radius: 3px;
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--gray-400);
  overflow-x: auto;
}

.isa-example {
  background: rgba(77, 201, 246, 0.05);
  padding: 16px;
  border-radius: 3px;
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--cyan-accent);
}

/* ═══════════════════════════════════════════════════════════════════════════
   5. PIPELINE EXPLORER (Architecture Deep Dive)
   ═══════════════════════════════════════════════════════════════════════════ */

.arch-pipeline {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 40px;
  overflow-x: auto;
  padding: 20px 0;
}

.arch-stage {
  min-width: 160px;
  padding: 32px 20px;
  background: rgba(77, 201, 246, 0.04);
  border: 1px solid rgba(77, 201, 246, 0.15);
  border-radius: 8px;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s;
}

.arch-stage:hover {
  border-color: var(--cyan-accent);
  background: rgba(77, 201, 246, 0.08);
  box-shadow: 0 0 20px rgba(77, 201, 246, 0.1);
}

.arch-stage.active {
  border-color: var(--cyan-accent);
  background: rgba(77, 201, 246, 0.1);
  box-shadow: 0 0 30px rgba(77, 201, 246, 0.15);
}

.arch-stage:focus {
  outline: 2px solid var(--cyan-accent);
  outline-offset: 2px;
}

.arch-stage-label {
  font-family: var(--mono);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 8px;
}

.arch-stage-name {
  font-size: 0.8rem;
  color: var(--gray-400);
}

.arch-connector {
  font-family: var(--mono);
  font-size: 1.5rem;
  color: var(--gray-600);
}

.arch-detail-panel {
  background: rgba(77, 201, 246, 0.04);
  border: 1px solid rgba(77, 201, 246, 0.15);
  border-radius: 6px;
  padding: 32px;
  margin-bottom: 40px;
  min-height: 200px;
}

.arch-detail-content {
  color: var(--gray-400);
}

.arch-detail-content h4 {
  font-size: 1.2rem;
  color: var(--white);
  margin-bottom: 16px;
}

.arch-detail-content ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.arch-detail-content li {
  padding: 8px 0;
  border-bottom: 1px solid rgba(77, 201, 246, 0.05);
  font-size: 0.9rem;
}

.arch-forwarding-diagram {
  display: block;
  margin: 0 auto;
}

/* ═══════════════════════════════════════════════════════════════════════════
   6. VERIFICATION
   ═══════════════════════════════════════════════════════════════════════════ */

.verify-flow {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  margin: 48px auto;
  max-width: 600px;
}

.verify-step {
  padding: 20px 32px;
  border: 1px solid rgba(77, 201, 246, 0.15);
  border-radius: 6px;
  text-align: center;
  width: 100%;
  transition: all 0.3s;
}

.verify-step.verify-complete {
  border-color: rgba(77, 201, 246, 0.3);
  background: rgba(77, 201, 246, 0.04);
}

.verify-step.verify-proven {
  border-color: var(--cyan-accent);
  background: rgba(77, 201, 246, 0.1);
  box-shadow: 0 0 30px rgba(77, 201, 246, 0.15);
}

.verify-label {
  font-family: var(--mono);
  font-size: 1rem;
  color: var(--white);
  font-weight: 500;
  margin-bottom: 4px;
}

.verify-desc {
  font-size: 0.8rem;
  color: var(--gray-400);
}

.verify-link {
  margin-top: 8px;
}

.verify-link a {
  font-size: 0.75rem;
  font-family: var(--mono);
}

.verify-arrow {
  color: var(--gray-600);
  font-size: 1.2rem;
  padding: 8px 0;
}

.verify-theorems {
  margin: 64px 0;
}

.verify-theorems h3 {
  font-size: 1.2rem;
  color: var(--white);
  margin-bottom: 24px;
  text-align: center;
}

.theorem-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
}

.theorem-card {
  padding: 12px 16px;
  background: rgba(77, 201, 246, 0.05);
  border: 1px solid rgba(77, 201, 246, 0.15);
  border-radius: 4px;
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--cyan-accent);
  text-align: center;
}

.verify-stats {
  display: flex;
  gap: 48px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 64px;
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.stat-num {
  font-family: var(--mono);
  font-size: 2.5rem;
  font-weight: 300;
  color: var(--white);
}

.stat-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--gray-600);
  text-align: center;
  max-width: 120px;
}

/* ═══════════════════════════════════════════════════════════════════════════
   7. TENSOR EXTENSION
   ═══════════════════════════════════════════════════════════════════════════ */

#tensor {
  background: var(--navy);
  max-width: none;
  padding: 120px 40px;
}

.tensor-block {
  max-width: 900px;
  margin: 40px auto 0;
}

.tensor-banner {
  margin-bottom: 32px;
}

.tensor-badge {
  display: inline-block;
  padding: 8px 16px;
  background: rgba(251, 54, 64, 0.15);
  border: 1px solid rgba(251, 54, 64, 0.4);
  border-radius: 4px;
  font-family: var(--mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--red);
  margin-bottom: 16px;
}

.tensor-redacted {
  display: flex;
  gap: 8px;
}

.redact-bar {
  flex: 1;
  height: 10px;
  background: rgba(251, 54, 64, 0.3);
  border-radius: 2px;
  animation: redact-pulse 2s infinite alternate;
}

@keyframes redact-pulse {
  from { opacity: 0.4; }
  to { opacity: 0.8; }
}

@media (prefers-reduced-motion: reduce) {
  .redact-bar { animation: none; opacity: 0.6; }
}

.tensor-notice {
  text-align: center;
  padding: 24px;
  border: 1px solid rgba(251, 54, 64, 0.2);
  border-radius: 6px;
  margin-bottom: 40px;
  background: rgba(251, 54, 64, 0.03);
}

.tensor-notice p {
  color: var(--gray-400);
  font-size: 0.9rem;
  font-style: italic;
}

.tensor-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  margin-bottom: 40px;
}

.tensor-col h3 {
  font-size: 0.9rem;
  color: var(--cyan-accent);
  margin-bottom: 16px;
  font-family: var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.tensor-item {
  margin-bottom: 20px;
  padding-bottom: 20px;
  border-bottom: 1px solid rgba(77, 201, 246, 0.08);
}

.tensor-label {
  font-size: 0.8rem;
  color: var(--gray-600);
  margin-bottom: 6px;
  font-weight: 500;
}

.tensor-text {
  font-size: 0.85rem;
  color: var(--gray-400);
  line-height: 1.6;
}

.tensor-item.tensor-restricted .tensor-text {
  color: var(--gray-600);
  font-style: italic;
}

.tensor-footer {
  text-align: center;
  padding: 20px;
  background: rgba(77, 201, 246, 0.04);
  border-radius: 6px;
}

.tensor-footer p {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--gray-400);
}

/* ═══════════════════════════════════════════════════════════════════════════
   8. SILICON
   ═══════════════════════════════════════════════════════════════════════════ */

.silicon-selector {
  display: flex;
  gap: 8px;
  margin-bottom: 32px;
  flex-wrap: wrap;
  justify-content: center;
}

.silicon-tab {
  padding: 10px 20px;
  background: rgba(77, 201, 246, 0.05);
  border: 1px solid rgba(77, 201, 246, 0.2);
  border-radius: 4px;
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--gray-400);
  cursor: pointer;
  transition: all 0.2s;
}

.silicon-tab:hover {
  border-color: var(--cyan-accent);
  color: var(--cyan);
}

.silicon-tab.active {
  background: rgba(77, 201, 246, 0.12);
  border-color: var(--cyan-accent);
  color: var(--white);
}

.silicon-tab:focus {
  outline: 2px solid var(--cyan-accent);
  outline-offset: 2px;
}

.silicon-content {
  position: relative;
  min-height: 400px;
}

.silicon-panel {
  display: none;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.silicon-panel.active {
  display: grid;
}

.silicon-visual {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px;
}

.chip-outline {
  width: 200px;
  height: 200px;
  border: 2px solid var(--cyan-accent);
  border-radius: 8px;
  position: relative;
  transition: transform 0.3s;
}

.chip-outline:hover {
  transform: rotate(2deg) scale(1.05);
}

@media (prefers-reduced-motion: reduce) {
  .chip-outline:hover { transform: none; }
}

.chip-outline::before {
  content: '';
  position: absolute;
  inset: 10px;
  border: 1px solid rgba(77, 201, 246, 0.3);
  border-radius: 4px;
}

.chip-outline::after {
  content: '';
  position: absolute;
  inset: 20px;
  border: 1px solid rgba(77, 201, 246, 0.2);
  border-radius: 2px;
}

.fpga-outline { background: radial-gradient(circle, rgba(77, 201, 246, 0.1), transparent); }
.asic-outline { background: radial-gradient(circle, rgba(77, 201, 246, 0.15), transparent); }
.pcie-outline { background: radial-gradient(circle, rgba(77, 201, 246, 0.08), transparent); }
.m2-outline { background: radial-gradient(circle, rgba(77, 201, 246, 0.08), transparent); }
.devkit-outline { background: radial-gradient(circle, rgba(77, 201, 246, 0.12), transparent); }

.silicon-info h3 {
  font-size: 1.5rem;
  color: var(--white);
  margin-bottom: 12px;
}

.silicon-info > p {
  color: var(--gray-400);
  margin-bottom: 20px;
  line-height: 1.6;
}

.silicon-status {
  display: inline-block;
  padding: 6px 12px;
  border-radius: 3px;
  font-family: var(--mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 24px;
}

.status-planned {
  background: rgba(77, 201, 246, 0.1);
  color: var(--cyan-accent);
  border: 1px solid rgba(77, 201, 246, 0.3);
}

.status-research {
  background: rgba(159, 179, 200, 0.1);
  color: var(--gray-400);
  border: 1px solid rgba(159, 179, 200, 0.3);
}

.silicon-details {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.silicon-details p {
  font-size: 0.85rem;
  color: var(--gray-400);
  padding: 8px 0;
  border-bottom: 1px solid rgba(77, 201, 246, 0.05);
}

/* ═══════════════════════════════════════════════════════════════════════════
   9. DOCUMENTATION
   ═══════════════════════════════════════════════════════════════════════════ */

.docs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-top: 40px;
}

.doc-card {
  display: block;
  padding: 24px 20px;
  background: rgba(77, 201, 246, 0.03);
  border: 1px solid rgba(77, 201, 246, 0.1);
  border-radius: 6px;
  transition: all 0.2s;
}
.doc-card:hover {
  border-color: rgba(77, 201, 246, 0.3);
  background: rgba(77, 201, 246, 0.06);
}
.doc-card:focus {
  outline: 2px solid var(--cyan-accent);
  outline-offset: 2px;
}

.doc-card h3 {
  font-size: 0.95rem;
  color: var(--white);
  margin-bottom: 8px;
}

.doc-card p {
  font-size: 0.8rem;
  color: var(--gray-400);
}

/* ═══════════════════════════════════════════════════════════════════════════
   11. PERFORMANCE PHILOSOPHY
   ═══════════════════════════════════════════════════════════════════════════ */

#philosophy {
  background: var(--navy);
  max-width: none;
  padding: 120px 40px;
}

#philosophy h2, #philosophy .section-desc {
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
}

.philosophy-grid {
  max-width: 900px;
  margin: 40px auto 0;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.phil-item {
  padding: 32px;
  border-bottom: 1px solid rgba(77, 201, 246, 0.1);
  transition: background 0.3s;
}

.phil-item:hover {
  background: rgba(77, 201, 246, 0.03);
}

.phil-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.phil-metric {
  font-family: var(--mono);
  font-size: 1.2rem;
  color: var(--white);
}

.phil-icon {
  font-size: 1.5rem;
  color: var(--cyan-accent);
}

.phil-desc {
  color: var(--gray-400);
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: 8px;
}

.phil-proof {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--cyan-accent);
}

.philosophy-statement {
  max-width: 900px;
  margin: 64px auto 0;
  padding: 32px;
  background: rgba(77, 201, 246, 0.04);
  border-left: 4px solid var(--cyan-accent);
  border-radius: 4px;
}

.philosophy-statement p {
  color: var(--gray-400);
  font-size: 1rem;
  line-height: 1.8;
}

/* ═══════════════════════════════════════════════════════════════════════════
   12. DEVELOPMENT TIMELINE
   ═══════════════════════════════════════════════════════════════════════════ */

.timeline-flow {
  max-width: 600px;
  margin: 48px auto 0;
}

.timeline-item {
  display: flex;
  gap: 20px;
  padding: 20px 0;
}

.tl-marker {
  font-size: 1.2rem;
  width: 30px;
  text-align: center;
  flex-shrink: 0;
}

.tl-content {
  flex: 1;
}

.tl-label {
  font-size: 1rem;
  font-weight: 500;
  margin-bottom: 4px;
}

.tl-desc {
  font-size: 0.85rem;
  line-height: 1.6;
}

.timeline-item.tl-complete .tl-marker { color: var(--cyan-accent); }
.timeline-item.tl-complete .tl-label { color: var(--white); }
.timeline-item.tl-complete .tl-desc { color: var(--gray-400); }

.timeline-item.tl-active .tl-marker { color: var(--red); }
.timeline-item.tl-active .tl-label { color: var(--red); font-weight: 600; }
.timeline-item.tl-active .tl-desc { color: var(--gray-400); }

.timeline-item.tl-planned .tl-marker { color: var(--gray-600); }
.timeline-item.tl-planned .tl-label { color: var(--gray-600); }
.timeline-item.tl-planned .tl-desc { color: var(--gray-600); }

.timeline-legend {
  display: flex;
  gap: 32px;
  justify-content: center;
  margin-top: 48px;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--gray-400);
}

.legend-marker {
  font-size: 1rem;
}

.legend-complete { color: var(--cyan-accent); }
.legend-active { color: var(--red); }
.legend-planned { color: var(--gray-600); }

/* ═══════════════════════════════════════════════════════════════════════════
   13. FOOTER
   ═══════════════════════════════════════════════════════════════════════════ */

footer {
  background: var(--navy-deep);
  border-top: 1px solid rgba(77, 201, 246, 0.08);
  padding: 64px 40px 40px;
}

.footer-brand {
  max-width: 1200px;
  margin: 0 auto 48px;
  text-align: center;
}

.footer-logo {
  font-size: 1.5rem;
  font-weight: 300;
  letter-spacing: 0.1em;
  color: var(--white);
  margin-bottom: 8px;
}

.footer-tagline {
  font-size: 0.85rem;
  color: var(--gray-600);
}

.footer-grid {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 32px;
  margin-bottom: 48px;
}

.footer-col h4 {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--gray-600);
  margin-bottom: 16px;
}

.footer-col a {
  display: block;
  font-size: 0.85rem;
  color: var(--gray-400);
  padding: 6px 0;
}
.footer-col a:hover { color: var(--white); }

.footer-bottom {
  max-width: 1200px;
  margin: 0 auto;
  text-align: center;
  padding-top: 32px;
  border-top: 1px solid rgba(77, 201, 246, 0.05);
}

.footer-bottom p {
  font-size: 0.8rem;
  color: var(--gray-600);
}

.footer-license {
  font-family: var(--mono);
  font-size: 0.7rem;
  margin-top: 8px;
  color: var(--gray-600);
}

/* ═══════════════════════════════════════════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════════════════════════════════════════ */

@media (max-width: 1279px) {
  .isa-container {
    grid-template-columns: 250px 1fr;
    gap: 24px;
  }

  .silicon-panel {
    grid-template-columns: 1fr;
  }

  .silicon-visual {
    order: -1;
  }
}

@media (max-width: 767px) {
  section { padding: 80px 24px; }
  #hero { padding: 60px 24px; }

  section h2 { font-size: 1.5rem; }

  .hero-buttons {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-stack {
    flex-direction: column;
    gap: 16px;
  }

  .pipeline-stages {
    flex-direction: column;
    align-items: stretch;
  }

  .stage-arrow {
    transform: rotate(90deg);
    text-align: center;
  }

  .lab-panels {
    grid-template-columns: 1fr;
  }

  .isa-container {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .isa-sidebar {
    order: 1;
  }

  .isa-detail {
    order: 2;
    padding: 20px;
  }

  .arch-pipeline {
    flex-direction: column;
    align-items: stretch;
  }

  .arch-connector {
    transform: rotate(90deg);
  }

  .tensor-split {
    grid-template-columns: 1fr;
  }

  .silicon-selector {
    flex-direction: column;
  }

  .philosophy-grid {
    padding: 0;
  }

  .phil-item {
    padding: 24px 0;
  }

  .phil-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}

/* ═══════════════════════════════════════════════════════════════════════════
   REGISTER FILE + QUEUE + WAVEFORM PANELS
   ═══════════════════════════════════════════════════════════════════════════ */

.lab-panels {
  display: grid;
  grid-template-columns: 1fr 1fr 2fr;
  gap: 16px;
  margin: 32px 0;
}

.lab-panel {
  background: rgba(77, 201, 246, 0.03);
  border: 1px solid rgba(77, 201, 246, 0.12);
  border-radius: 6px;
  padding: 16px;
}

.lab-panel h3 {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--gray-400);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 12px;
}

.registers-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 4px;
}

.reg-cell {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 4px;
  border-radius: 3px;
  transition: background 0.2s;
}

.reg-cell.reg-updated {
  background: rgba(77, 201, 246, 0.15);
}

.reg-name {
  font-family: var(--mono);
  font-size: 0.65rem;
  color: var(--gray-600);
}

.reg-val {
  font-family: var(--mono);
  font-size: 0.6rem;
  color: var(--cyan-accent);
}

.queue-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.queue-item {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--gray-400);
  padding: 4px 8px;
  border-radius: 3px;
  background: rgba(77, 201, 246, 0.03);
  border: 1px solid rgba(77, 201, 246, 0.06);
}

.queue-item.queue-next {
  border-color: var(--cyan-accent);
  color: var(--cyan-accent);
  background: rgba(77, 201, 246, 0.08);
}

#waveform-canvas {
  width: 100%;
  height: 200px;
  border-radius: 4px;
  background: rgba(6, 21, 57, 0.6);
}

.lab-stats {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
  margin-top: 24px;
}

.stat-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat-item .stat-label {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--gray-600);
}

.stat-item span:last-child {
  font-family: var(--mono);
  font-size: 1rem;
  color: var(--white);
}

/* Forwarding SVG */
.forwarding-svg {
  display: block;
  margin: 8px 0;
}

.fwd-line {
  stroke: var(--cyan-accent);
  stroke-width: 2;
  stroke-dasharray: 6 4;
  opacity: 0;
  transition: opacity 0.3s;
}

.fwd-line.active {
  opacity: 1;
  animation: fwd-pulse 0.6s ease-in-out;
}

@keyframes fwd-pulse {
  0%, 100% { opacity: 0.6; }
  50% { opacity: 1; }
}

/* Reduced motion */
.reduced-motion * {
  animation-duration: 0s !important;
  transition-duration: 0s !important;
}

@media (max-width: 768px) {
  .lab-panels {
    grid-template-columns: 1fr;
  }

  .registers-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}