/* ============================================
   BitSolver Product Page — Styles
   Extends the SimplexArc design system
   ============================================ */

/* --- Product Hero --- */
.product-hero {
  position: relative;
  padding: 120px 24px 64px;
  text-align: center;
  overflow: hidden;
  background: var(--bg-primary);
}

.product-hero-glow {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 900px;
  height: 600px;
  background: radial-gradient(
    ellipse at center,
    rgba(108, 60, 225, 0.08) 0%,
    rgba(74, 144, 226, 0.04) 40%,
    transparent 70%
  );
  pointer-events: none;
  animation: float 12s ease-in-out infinite;
}

.product-hero-content {
  position: relative;
  z-index: 1;
  max-width: 720px;
  margin: 0 auto;
}

.product-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  background: rgba(108, 60, 225, 0.1);
  border: 1px solid rgba(108, 60, 225, 0.2);
  border-radius: 100px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 24px;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--emerald);
  animation: pulse-glow 2s ease-in-out infinite;
}

.product-title {
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.04em;
  margin-bottom: 24px;
}

.product-brand {
  font-style: italic;
  font-weight: 300;
  opacity: 0.7;
}

.product-subtitle {
  font-size: clamp(1.05rem, 2vw, 1.2rem);
  font-weight: 400;
  color: var(--text-secondary);
  line-height: 1.75;
  max-width: 580px;
  margin: 0 auto 40px;
}

.product-hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.product-cta-secondary {
  padding: 16px 36px;
  border: 1px solid var(--border-subtle);
  border-radius: 100px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  transition: var(--transition-normal);
}

.product-cta-secondary:hover {
  border-color: var(--border-glow);
  background: var(--bg-surface-hover);
  box-shadow: 0 0 20px rgba(74, 144, 226, 0.1);
}

/* --- Problem Grid --- */
.problem-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.problem-card {
  padding: 36px 28px;
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  transition: var(--transition-slow);
  position: relative;
  overflow: hidden;
}

.problem-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--gradient-brand-horizontal);
  opacity: 0;
  transition: var(--transition-normal);
}

.problem-card:hover {
  border-color: var(--border-glow);
  transform: translateY(-4px);
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

.problem-card:hover::before {
  opacity: 1;
}

.problem-icon {
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(74, 144, 226, 0.12), rgba(108, 60, 225, 0.08));
  border: 1px solid rgba(74, 144, 226, 0.15);
  color: var(--blue);
  margin-bottom: 24px;
}

.problem-icon.icon-emerald {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.12), rgba(6, 182, 212, 0.08));
  border-color: rgba(16, 185, 129, 0.15);
  color: var(--emerald);
}

.problem-icon.icon-cyan {
  background: linear-gradient(135deg, rgba(6, 182, 212, 0.12), rgba(74, 144, 226, 0.08));
  border-color: rgba(6, 182, 212, 0.15);
  color: var(--cyan);
}

.problem-icon.icon-purple {
  background: linear-gradient(135deg, rgba(108, 60, 225, 0.12), rgba(74, 144, 226, 0.08));
  border-color: rgba(108, 60, 225, 0.15);
  color: var(--purple);
}

.problem-title {
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 4px;
}

.problem-type {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 14px;
}

.problem-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
}

.problem-uses {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.problem-uses span {
  padding: 4px 12px;
  border: 1px solid var(--border-subtle);
  border-radius: 100px;
  font-size: 11px;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

/* --- Architecture Visual --- */
.architecture-visual {
  max-width: 700px;
  margin: 0 auto 64px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.arch-row {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.arch-chip {
  padding: 14px 28px;
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.arch-chip-glow {
  background: linear-gradient(135deg, rgba(108, 60, 225, 0.12), rgba(16, 185, 129, 0.08));
  border-color: rgba(74, 144, 226, 0.2);
  box-shadow: 0 0 30px rgba(74, 144, 226, 0.08);
}

.arch-connector {
  width: 2px;
  height: 32px;
  background: linear-gradient(180deg, var(--border-subtle), rgba(108, 60, 225, 0.3));
  margin: 0 auto;
}

.arch-solver {
  padding: 16px 24px;
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  text-align: center;
  min-width: 120px;
}

.arch-solver-label {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.arch-solver-sub {
  font-size: 11px;
  color: var(--text-muted);
  font-weight: 500;
}

/* --- Differentiator Grid --- */
.diff-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.diff-card {
  text-align: center;
  padding: 40px 24px;
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  transition: var(--transition-slow);
}

.diff-card:hover {
  border-color: var(--border-glow);
  transform: translateY(-2px);
}

.diff-number {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 8px;
}

.diff-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.diff-desc {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* --- Benchmark Cards --- */
.benchmarks {
  background: var(--bg-primary);
}

.benchmark-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.benchmark-card {
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition-slow);
}

.benchmark-card:hover {
  border-color: var(--border-glow);
  transform: translateY(-3px);
  box-shadow: 0 16px 48px rgba(0,0,0,0.25);
}

.benchmark-header {
  padding: 28px 32px 20px;
  border-bottom: 1px solid var(--border-subtle);
}

.benchmark-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.benchmark-source {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 500;
}

.benchmark-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
}

.stat {
  padding: 20px 24px;
  border-right: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.stat:nth-child(2n) {
  border-right: none;
}

.stat:nth-child(n+3) {
  border-bottom: none;
}

.stat-value {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.stat-value.stat-highlight {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 11px;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* --- Code Example --- */
.code-example {
  max-width: 640px;
  margin: 0 auto;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border-subtle);
  background: rgba(12, 12, 20, 0.9);
}

.code-header {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 20px;
  background: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid var(--border-subtle);
}

.code-dots {
  display: flex;
  gap: 6px;
}

.code-dots span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
}

.code-dots span:first-child { background: #ff5f57; }
.code-dots span:nth-child(2) { background: #ffbd2e; }
.code-dots span:last-child { background: #28c840; }

.code-filename {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  font-family: 'SF Mono', 'Fira Code', monospace;
}

.code-body {
  padding: 24px;
  margin: 0;
  overflow-x: auto;
}

.code-body code {
  font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-secondary);
  white-space: pre;
}

/* --- CTA Section --- */
.product-cta-section {
  padding: 24px 0 56px;
}

.product-cta-box {
  text-align: center;
  padding: 48px 40px;
  background: linear-gradient(135deg, rgba(108, 60, 225, 0.06), rgba(74, 144, 226, 0.04));
  border: 1px solid rgba(108, 60, 225, 0.15);
  border-radius: var(--radius-xl);
}

.product-cta-box h2 {
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 700;
  margin-bottom: 12px;
}

.product-cta-box p {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .product-hero {
    padding: 100px 20px 48px;
  }

  .problem-grid,
  .benchmark-grid {
    grid-template-columns: 1fr;
  }

  .diff-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .arch-row.arch-solvers {
    flex-direction: column;
    align-items: center;
  }

  .product-hero-actions {
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  .product-title {
    font-size: 2.5rem;
  }

  .problem-card {
    padding: 28px 24px;
  }
}

/* ── Demo Link Cards ── */
.demo-links-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  max-width: 800px;
  margin: 0 auto;
}

.demo-link-card {
  display: flex;
  flex-direction: column;
  padding: 32px 28px;
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: inherit;
  transition: all 0.3s ease;
}

.demo-link-card:hover {
  border-color: rgba(108, 60, 225, 0.3);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.demo-link-flag {
  font-size: 2rem;
  margin-bottom: 16px;
  line-height: 1;
}

.demo-link-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.demo-link-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  flex: 1;
  margin-bottom: 20px;
}

.demo-link-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  transition: gap 0.2s ease;
}

.demo-link-card:hover .demo-link-cta {
  gap: 12px;
}

.demo-link-cta svg {
  stroke: var(--purple);
}

@media (max-width: 640px) {
  .demo-links-grid {
    grid-template-columns: 1fr;
  }
}