/* =============================================
   DESIGN TOKENS & RESET
   ============================================= */
:root {
  --bg-primary: #060812;
  --bg-secondary: #0c1120;
  --bg-card: rgba(255,255,255,0.035);
  --bg-card-hover: rgba(255,255,255,0.06);
  --border: rgba(255,255,255,0.08);
  --border-bright: rgba(99,179,248,0.3);

  --quantum-blue: #3b82f6;
  --quantum-cyan: #06b6d4;
  --quantum-purple: #a855f7;
  --quantum-pink: #ec4899;
  --quantum-green: #10b981;
  --quantum-gold: #f59e0b;

  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #475569;

  --gradient-main: linear-gradient(135deg, var(--quantum-blue), var(--quantum-purple));
  --gradient-glow: linear-gradient(135deg, #3b82f620, #a855f720);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  --shadow-card: 0 4px 30px rgba(0,0,0,0.5);
  --shadow-glow: 0 0 40px rgba(59,130,246,0.15);

  --transition: all 0.25s cubic-bezier(0.4,0,0.2,1);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  overflow-x: hidden;
  min-height: 100vh;
  line-height: 1.6;
}

/* =============================================
   BACKGROUND PARTICLES
   ============================================= */
.bg-particles {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.particle {
  position: absolute;
  border-radius: 50%;
  animation: drift linear infinite;
  opacity: 0;
}

@keyframes drift {
  0% { transform: translateY(100vh) scale(0); opacity: 0; }
  10% { opacity: 1; }
  90% { opacity: 0.6; }
  100% { transform: translateY(-20px) scale(1); opacity: 0; }
}

/* =============================================
   HEADER
   ============================================= */
.site-header {
  position: fixed;
  top: 0;
  left: 0; right: 0;
  z-index: 100;
  background: rgba(6,8,18,0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 0 2rem;
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text-primary);
}
.logo-icon { font-size: 1.4rem; }
.logo-text { background: var(--gradient-main); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }

.header-nav { display: flex; gap: 0.2rem; }
.nav-link {
  padding: 0.4rem 0.9rem;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 500;
  transition: var(--transition);
}
.nav-link:hover { color: var(--text-primary); background: var(--bg-card-hover); }

/* =============================================
   HERO
   ============================================= */
.hero {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 4rem;
  max-width: 1200px;
  margin: 0 auto;
  padding: 8rem 2rem 4rem;
}

.hero-content { }

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.9rem;
  border-radius: 999px;
  border: 1px solid rgba(59,130,246,0.4);
  background: rgba(59,130,246,0.1);
  color: var(--quantum-blue);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 1.5rem;
}

.badge-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--quantum-cyan);
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse { 0%,100%{opacity:1;transform:scale(1)} 50%{opacity:0.5;transform:scale(1.4)} }

.hero-title {
  font-size: clamp(3rem, 6vw, 5.5rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin-bottom: 1.4rem;
}

.gradient-text {
  background: linear-gradient(135deg, var(--quantum-cyan), var(--quantum-blue), var(--quantum-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: gradient-shift 4s ease infinite;
  background-size: 200% 200%;
}
@keyframes gradient-shift { 0%,100%{background-position:0% 50%} 50%{background-position:100% 50%} }

.hero-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 480px;
  margin-bottom: 2.5rem;
  line-height: 1.75;
}
.hero-subtitle strong { color: var(--quantum-cyan); font-weight: 600; }
.hero-subtitle em { color: var(--quantum-gold); font-style: normal; font-weight: 600; }

.hero-stats {
  display: flex;
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.stat-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 1rem 1.5rem;
  border-radius: var(--radius-md);
  background: var(--bg-card);
  border: 1px solid var(--border);
  min-width: 110px;
  transition: var(--transition);
}
.stat-card:hover { background: var(--bg-card-hover); border-color: var(--border-bright); }
.stat-card.stat-highlight {
  border-color: rgba(59,130,246,0.4);
  background: rgba(59,130,246,0.08);
  box-shadow: 0 0 20px rgba(59,130,246,0.1);
}

.stat-value {
  font-size: 2rem;
  font-weight: 800;
  font-family: 'JetBrains Mono', monospace;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-label { font-size: 0.72rem; color: var(--text-muted); font-weight: 500; text-transform: uppercase; letter-spacing: 0.06em; margin-top: 0.2rem; }

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.85rem 2rem;
  border-radius: var(--radius-md);
  background: var(--gradient-main);
  color: #fff;
  font-weight: 600;
  font-size: 0.95rem;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 4px 20px rgba(59,130,246,0.3);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(59,130,246,0.4); }
.btn-primary:active { transform: translateY(0); }

.hero-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}
#heroCanvas { width: 100%; max-width: 420px; }

/* =============================================
   SHARED SECTION STYLES
   ============================================= */
section { position: relative; z-index: 1; }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 5rem 2rem;
}

.section-label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--quantum-cyan);
  margin-bottom: 0.75rem;
}

.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  margin-bottom: 3rem;
  color: var(--text-primary);
}

/* =============================================
   STEPS SECTION
   ============================================= */
.steps-section {
  background: linear-gradient(180deg, transparent, rgba(59,130,246,0.03), transparent);
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.step-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-glow);
  opacity: 0;
  transition: var(--transition);
}
.step-card:hover { border-color: var(--border-bright); transform: translateY(-4px); box-shadow: var(--shadow-glow); }
.step-card:hover::before { opacity: 1; }

.step-number {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 0.1em;
  margin-bottom: 1rem;
}
.step-icon { font-size: 2.2rem; margin-bottom: 1rem; display: block; }
.step-card h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: 0.75rem; }
.step-card p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.7; margin-bottom: 1.25rem; }

.step-formula {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.82rem;
  color: var(--quantum-cyan);
  background: rgba(6,182,212,0.08);
  border: 1px solid rgba(6,182,212,0.2);
  border-radius: var(--radius-sm);
  padding: 0.5rem 0.75rem;
}

code {
  font-family: 'JetBrains Mono', monospace;
  background: rgba(255,255,255,0.08);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  font-size: 0.85em;
  color: var(--quantum-cyan);
}

/* =============================================
   SIMULATOR
   ============================================= */
.simulator-section {
  background: linear-gradient(180deg, transparent, rgba(168,85,247,0.03), transparent);
}

.controls-panel {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr auto;
  gap: 1.5rem;
  align-items: end;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin-bottom: 1.5rem;
}

.control-group { display: flex; flex-direction: column; gap: 0.5rem; }
.control-group label { font-size: 0.82rem; font-weight: 600; color: var(--text-secondary); text-transform: uppercase; letter-spacing: 0.08em; }

.slider-row { display: flex; align-items: center; gap: 0.75rem; }

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  border-radius: 2px;
  background: var(--border);
  outline: none;
  cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: var(--gradient-main);
  cursor: pointer;
  box-shadow: 0 0 10px rgba(59,130,246,0.4);
  transition: var(--transition);
}
input[type="range"]::-webkit-slider-thumb:hover { transform: scale(1.2); }

.slider-val {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--quantum-cyan);
  min-width: 36px;
  text-align: right;
}
.control-hint { font-size: 0.78rem; color: var(--text-muted); }

.speed-btns { display: flex; gap: 0.4rem; }
.speed-btn {
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}
.speed-btn:hover { background: var(--bg-card-hover); color: var(--text-primary); }
.speed-btn.active { background: rgba(59,130,246,0.15); border-color: rgba(59,130,246,0.4); color: var(--quantum-blue); }

.control-actions { display: flex; flex-direction: column; gap: 0.5rem; }

.btn-run, .btn-reset {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.4rem;
  border-radius: var(--radius-md);
  border: none;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}
.btn-run {
  background: var(--gradient-main);
  color: #fff;
  box-shadow: 0 4px 15px rgba(59,130,246,0.25);
}
.btn-run:hover { transform: translateY(-1px); box-shadow: 0 6px 25px rgba(59,130,246,0.4); }
.btn-run:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

.btn-reset {
  background: var(--bg-card);
  color: var(--text-secondary);
  border: 1px solid var(--border);
}
.btn-reset:hover { background: var(--bg-card-hover); color: var(--text-primary); }
.btn-icon { font-size: 0.9rem; }

/* Status bar */
.status-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-bottom: 2rem;
}

.status-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
}
.status-label { font-size: 0.72rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-muted); display: block; margin-bottom: 0.4rem; }
.status-val { font-family: 'JetBrains Mono', monospace; font-size: 1rem; font-weight: 700; color: var(--text-primary); }
.status-val.highlight { color: var(--quantum-green); }

/* Amplitude Chart */
.chart-section {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin-bottom: 1.5rem;
}

.chart-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 2rem;
}

.chart-title { font-size: 1rem; font-weight: 700; }

.chart-legend { display: flex; align-items: center; gap: 1.2rem; font-size: 0.8rem; color: var(--text-secondary); }
.legend-dot { display: inline-block; width: 10px; height: 10px; border-radius: 50%; margin-right: 0.3rem; }
.legend-dot.target { background: var(--quantum-gold); box-shadow: 0 0 8px rgba(245,158,11,0.6); }
.legend-dot.other { background: var(--quantum-blue); }

.amplitude-chart {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: 4px;
  height: 200px;
  position: relative;
  border-bottom: 1px solid var(--border);
  margin-bottom: 0.75rem;
}

.amp-bar {
  flex: 1;
  max-width: 60px;
  min-width: 8px;
  border-radius: 4px 4px 0 0;
  transition: height 0.45s cubic-bezier(0.34, 1.56, 0.64, 1), background 0.45s ease;
  cursor: pointer;
  position: relative;
}
.amp-bar:hover { filter: brightness(1.3); }
.amp-bar .bar-tip {
  position: absolute;
  top: -22px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.65rem;
  font-family: 'JetBrains Mono', monospace;
  color: var(--text-secondary);
  white-space: nowrap;
  opacity: 0;
  transition: opacity 0.2s;
  pointer-events: none;
}
.amp-bar:hover .bar-tip { opacity: 1; }

.amplitude-labels {
  display: flex;
  gap: 4px;
  justify-content: center;
  padding: 0;
}
.amp-label {
  flex: 1;
  max-width: 60px;
  min-width: 8px;
  text-align: center;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.6rem;
  color: var(--text-muted);
  overflow: hidden;
}

/* Timeline */
.timeline-section {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
}

.timeline-track {
  display: flex;
  gap: 1rem;
  overflow-x: auto;
  padding-bottom: 0.5rem;
  margin-top: 1.25rem;
}

.timeline-step {
  min-width: 140px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1rem;
  flex-shrink: 0;
  transition: var(--transition);
  animation: slideIn 0.3s ease;
}
@keyframes slideIn { from { opacity:0; transform: translateX(20px); } to { opacity:1; transform: translateX(0); } }

.timeline-step.active { border-color: rgba(59,130,246,0.5); background: rgba(59,130,246,0.07); }
.timeline-step.complete { border-color: rgba(16,185,129,0.4); }
.timeline-step.oracle { border-color: rgba(168,85,247,0.4); }

.ts-phase { font-size: 0.68rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--text-muted); font-weight: 600; margin-bottom: 0.4rem; }
.ts-iter { font-family: 'JetBrains Mono', monospace; font-size: 1.1rem; font-weight: 700; color: var(--text-primary); margin-bottom: 0.4rem; }
.ts-prob { font-size: 0.8rem; color: var(--quantum-green); font-weight: 600; }

/* =============================================
   CIRCUIT
   ============================================= */
.circuit-section {
  background: linear-gradient(180deg, transparent, rgba(6,182,212,0.02), transparent);
}
.circuit-wrapper {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  overflow-x: auto;
  margin-bottom: 1rem;
}
#circuitCanvas { min-width: 700px; }
.circuit-caption { font-size: 0.83rem; color: var(--text-muted); text-align: center; }

/* =============================================
   COMPARISON
   ============================================= */
.comparison-grid {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 1.5rem;
  align-items: center;
  margin-bottom: 3rem;
}

.compare-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: var(--transition);
}
.compare-card:hover { border-color: var(--border-bright); transform: translateY(-3px); }
.compare-card.quantum { border-color: rgba(59,130,246,0.2); background: rgba(59,130,246,0.04); }
.compare-card.classical { border-color: rgba(100,116,139,0.3); }

.compare-header { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 1rem; }
.compare-icon { font-size: 1.6rem; }
.compare-card h3 { font-size: 1.1rem; font-weight: 700; }
.compare-complexity {
  font-family: 'JetBrains Mono', monospace;
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 1rem;
}
.compare-card.classical .compare-complexity { color: var(--text-muted); }
.compare-card.quantum .compare-complexity { background: var(--gradient-main); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.compare-card p { font-size: 0.88rem; color: var(--text-secondary); line-height: 1.7; margin-bottom: 1.5rem; }

.compare-chart { height: 60px; background: var(--bg-secondary); border-radius: var(--radius-sm); overflow: hidden; position: relative; }

.compare-vs {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}
.vs-badge {
  width: 56px; height: 56px;
  border-radius: 50%;
  background: var(--gradient-main);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1rem;
  box-shadow: 0 4px 20px rgba(59,130,246,0.3);
}
.speedup-label { font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--text-muted); font-weight: 600; }
.speedup-val { font-family: 'JetBrains Mono', monospace; font-size: 1.5rem; font-weight: 800; color: var(--quantum-gold); }
.speedup-note { font-size: 0.72rem; color: var(--text-muted); text-align: center; }

/* Growth table */
.growth-table-wrapper {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  overflow-x: auto;
}

.growth-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1.25rem;
  font-size: 0.88rem;
}

.growth-table th {
  text-align: left;
  padding: 0.75rem 1rem;
  color: var(--text-muted);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
  border-bottom: 1px solid var(--border);
}

.growth-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid rgba(255,255,255,0.03);
  font-family: 'JetBrains Mono', monospace;
}

.growth-table tr:hover td { background: var(--bg-card-hover); }
.growth-table .classical-steps { color: var(--text-muted); }
.growth-table .quantum-steps { color: var(--quantum-cyan); font-weight: 700; }
.growth-table .speedup-cell { color: var(--quantum-gold); font-weight: 700; }

/* =============================================
   THEORY
   ============================================= */
.theory-section { }

.theory-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr 1fr;
  gap: 1.5rem;
}

.theory-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
}
.theory-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 1.25rem; }
.theory-card canvas { display: block; margin: 0 auto 1.25rem; }
.theory-card p { font-size: 0.87rem; color: var(--text-secondary); line-height: 1.7; }

.fact-list { display: flex; flex-direction: column; gap: 1.25rem; }
.fact-item { display: flex; gap: 0.9rem; align-items: flex-start; }
.fact-icon { font-size: 1.4rem; flex-shrink: 0; margin-top: 0.1rem; }
.fact-item strong { display: block; font-size: 0.9rem; color: var(--text-primary); margin-bottom: 0.3rem; }
.fact-item p { font-size: 0.82rem; color: var(--text-secondary); line-height: 1.6; }

/* =============================================
   FOOTER
   ============================================= */
.site-footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--border);
  padding: 2.5rem 2rem;
  text-align: center;
}
.footer-inner { max-width: 1200px; margin: 0 auto; }
.footer-logo { font-size: 1.1rem; font-weight: 700; color: var(--text-secondary); margin-bottom: 0.5rem; }
.footer-note { font-size: 0.8rem; color: var(--text-muted); }

/* =============================================
   RESPONSIVE
   ============================================= */
@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; padding-top: 6rem; }
  .hero-visual { display: none; }
  .steps-grid { grid-template-columns: 1fr; }
  .controls-panel { grid-template-columns: 1fr 1fr; }
  .status-bar { grid-template-columns: 1fr 1fr; }
  .comparison-grid { grid-template-columns: 1fr; }
  .compare-vs { flex-direction: row; }
  .theory-grid { grid-template-columns: 1fr; }
  .header-nav { display: none; }
}

@media (max-width: 600px) {
  .controls-panel { grid-template-columns: 1fr; }
  .hero-stats { flex-wrap: wrap; }
}