:root {
  --bg-primary: #0a0f1a;
  --bg-secondary: #111827;
  --bg-card: #1a2235;
  --bg-card-hover: #1f2a40;
  --text-primary: #f0f2f5;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent: #38bdf8;
  --accent-warm: #f59e0b;
  --accent-green: #34d399;
  --border: #1e293b;
  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'DM Sans', sans-serif;
}

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

body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-body);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  font-family: var(--font-display);
  line-height: 1.15;
  letter-spacing: -0.02em;
}

/* ===== HERO ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 6rem 2rem 4rem;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(56, 189, 248, 0.08) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 20%, rgba(245, 158, 11, 0.05) 0%, transparent 50%),
    var(--bg-primary);
}

.hero-grid {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.hero-badge {
  display: inline-block;
  padding: 0.4rem 1rem;
  border: 1px solid var(--accent);
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 1.5rem;
}

.hero h1 {
  font-size: clamp(2.2rem, 4.5vw, 3.6rem);
  font-weight: 700;
  margin-bottom: 1.5rem;
}

.hero h1 .accent {
  color: var(--accent);
}

.hero-sub {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 520px;
  line-height: 1.8;
  margin-bottom: 2rem;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.8rem 1.6rem;
  background: var(--accent);
  color: #0a0f1a;
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: 10px;
  text-decoration: none;
  transition: opacity 0.2s, transform 0.15s;
}

.hero-cta:hover {
  opacity: 0.88;
  transform: translateY(-1px);
}

/* Data flow visual */
.hero-visual {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.data-flow {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 12px;
  transition: border-color 0.3s;
}

.data-flow:hover {
  border-color: var(--accent);
}

.flow-node {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 500;
  padding: 0.4rem 0.8rem;
  border-radius: 6px;
  white-space: nowrap;
}

.flow-node.input {
  background: rgba(245, 158, 11, 0.12);
  color: var(--accent-warm);
  border: 1px solid rgba(245, 158, 11, 0.2);
}

.flow-node.core {
  background: rgba(56, 189, 248, 0.15);
  color: var(--accent);
  border: 1px solid rgba(56, 189, 248, 0.25);
  font-weight: 600;
}

.flow-node.output {
  background: rgba(52, 211, 153, 0.12);
  color: var(--accent-green);
  border: 1px solid rgba(52, 211, 153, 0.2);
}

.flow-arrow {
  color: var(--text-muted);
  font-size: 1.1rem;
  flex-shrink: 0;
}

/* ===== PROBLEM ===== */
.problem {
  padding: 6rem 2rem;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.problem-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 4rem;
  align-items: start;
}

.stat-block {
  position: sticky;
  top: 2rem;
}

.stat-number {
  font-family: var(--font-display);
  font-size: 5rem;
  font-weight: 700;
  color: var(--accent-warm);
  line-height: 1;
  margin-bottom: 0.75rem;
}

.stat-label {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.problem-text h2 {
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  margin-bottom: 1.5rem;
}

.problem-text p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-bottom: 1.25rem;
  max-width: 640px;
}

.problem-emphasis {
  color: var(--text-primary) !important;
  font-style: italic;
  border-left: 3px solid var(--accent-warm);
  padding-left: 1.25rem;
  margin-top: 1rem !important;
}

/* ===== CAPABILITIES ===== */
.capabilities {
  padding: 6rem 2rem;
}

.capabilities-header {
  max-width: 1200px;
  margin: 0 auto 3rem;
}

.capabilities-header h2 {
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  margin-bottom: 0.75rem;
}

.capabilities-sub {
  color: var(--text-secondary);
  font-size: 1.1rem;
}

.capabilities-grid {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.capability-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2rem 2.25rem;
  transition: background 0.3s, border-color 0.3s;
}

.capability-card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(56, 189, 248, 0.2);
}

.capability-card.large {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-rows: auto auto;
  column-gap: 1.5rem;
}

.capability-card.large .cap-icon {
  grid-row: 1 / -1;
  font-size: 2.5rem;
  align-self: start;
}

.cap-icon {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 1rem;
  opacity: 0.6;
}

.capability-card h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.capability-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* ===== TIMING ===== */
.timing {
  padding: 6rem 2rem;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.timing-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 4rem;
  align-items: start;
}

.timeline {
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
  padding-left: 2rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.6rem;
  bottom: 0.6rem;
  width: 2px;
  background: var(--border);
}

.timeline-item {
  position: relative;
  padding: 1rem 0;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -2rem;
  top: 1.35rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--text-muted);
  transform: translateX(-4px);
}

.timeline-item.active::before {
  background: var(--accent);
  box-shadow: 0 0 12px rgba(56, 189, 248, 0.5);
}

.timeline-date {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.timeline-item.active .timeline-date {
  color: var(--accent);
}

.timeline-text {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.timing-content h2 {
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  margin-bottom: 1.5rem;
}

.timing-content p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-bottom: 1.25rem;
  max-width: 580px;
}

/* ===== CLOSING ===== */
.closing {
  padding: 8rem 2rem;
  text-align: center;
  background:
    radial-gradient(ellipse at 50% 50%, rgba(56, 189, 248, 0.06) 0%, transparent 70%),
    var(--bg-primary);
}

.closing-inner {
  max-width: 700px;
  margin: 0 auto;
}

.closing h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  margin-bottom: 1.5rem;
}

.closing-text {
  color: var(--text-secondary);
  font-size: 1.1rem;
  line-height: 1.9;
}

/* ===== FOOTER ===== */
.site-footer {
  padding: 3rem 2rem;
  border-top: 1px solid var(--border);
  text-align: center;
}

.footer-brand {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
}

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

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .hero {
    padding: 4rem 1.5rem 3rem;
    min-height: auto;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .hero-visual {
    order: -1;
  }

  .data-flow {
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
  }

  .flow-arrow {
    display: none;
  }

  .flow-node {
    font-size: 0.75rem;
  }

  .problem-inner {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .stat-block {
    position: static;
    display: flex;
    align-items: baseline;
    gap: 1rem;
  }

  .stat-number {
    font-size: 3.5rem;
  }

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

  .capability-card.large {
    grid-template-columns: 1fr;
  }

  .capability-card.large .cap-icon {
    grid-row: auto;
  }

  .timing-inner {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .closing {
    padding: 5rem 1.5rem;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.8rem;
  }

  .hero-sub {
    font-size: 1rem;
  }

  .stat-number {
    font-size: 2.8rem;
  }
}