:root {
  --bg: #0a0f1a;
  --bg-subtle: #111827;
  --fg: #f1f5f9;
  --fg-muted: #94a3b8;
  --accent: #22d3ee;
  --accent-dim: rgba(34, 211, 238, 0.12);
  --accent-glow: rgba(34, 211, 238, 0.3);
  --surface: #1e293b;
  --border: #334155;
  --radius: 12px;
  --max-width: 1080px;
}

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

body {
  background: var(--bg);
  color: var(--fg);
  font-family: 'DM Sans', sans-serif;
  font-size: 17px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  line-height: 1.2;
}

/* HERO */
.hero {
  min-height: 90vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 80px 24px 60px;
  background: radial-gradient(ellipse at 50% 0%, var(--accent-dim) 0%, transparent 60%);
}

.hero-inner {
  max-width: var(--max-width);
}

.hero-badge {
  display: inline-block;
  padding: 6px 16px;
  border-radius: 100px;
  background: var(--accent-dim);
  color: var(--accent);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  margin-bottom: 32px;
  border: 1px solid rgba(34, 211, 238, 0.2);
}

.hero h1 {
  font-size: clamp(2.4rem, 6vw, 4rem);
  margin-bottom: 24px;
  letter-spacing: -1px;
}

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

.lede {
  font-size: 1.15rem;
  color: var(--fg-muted);
  max-width: 640px;
  margin: 0 auto;
  line-height: 1.8;
}

/* FLOW DIAGRAM */
.hero-visual {
  margin-top: 60px;
}

.flow-diagram {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  padding: 32px;
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.flow-source {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 12px 16px;
  background: var(--bg);
  border-radius: 8px;
  border: 1px solid var(--border);
  font-size: 13px;
  color: var(--fg-muted);
}

.source-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--fg-muted);
}

.flow-arrow {
  font-size: 24px;
  color: var(--accent);
}

.flow-center {
  padding: 16px 28px;
  background: var(--accent-dim);
  border: 2px solid var(--accent);
  border-radius: var(--radius);
  color: var(--accent);
  font-size: 15px;
  box-shadow: 0 0 30px var(--accent-glow);
}

.flow-dest {
  padding: 12px 20px;
  background: var(--bg);
  border-radius: 8px;
  border: 1px solid var(--border);
  font-size: 13px;
  color: var(--fg-muted);
}

/* PROBLEM */
.problem {
  padding: 100px 24px;
  background: var(--bg-subtle);
}

.problem-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.problem h2 {
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  text-align: center;
  margin-bottom: 56px;
}

.problem-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 28px;
}

.problem-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
}

.problem-icon {
  font-size: 32px;
  margin-bottom: 16px;
}

.problem-card h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
}

.problem-card p {
  color: var(--fg-muted);
  font-size: 0.95rem;
}

/* HOW IT WORKS */
.how {
  padding: 100px 24px;
}

.how-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.how h2 {
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  text-align: center;
  margin-bottom: 56px;
}

.steps {
  display: flex;
  flex-direction: column;
  gap: 40px;
  max-width: 640px;
  margin: 0 auto;
}

.step {
  display: flex;
  gap: 24px;
  align-items: flex-start;
}

.step-number {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--accent-dim);
  border: 2px solid var(--accent);
  color: var(--accent);
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: 1.2rem;
}

.step-content h3 {
  font-size: 1.15rem;
  margin-bottom: 6px;
}

.step-content p {
  color: var(--fg-muted);
  font-size: 0.95rem;
}

/* FEATURES */
.features {
  padding: 100px 24px;
  background: var(--bg-subtle);
}

.features-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.features h2 {
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  text-align: center;
  margin-bottom: 56px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 28px;
}

.feature-item {
  padding: 28px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color 0.2s;
}

.feature-item:hover {
  border-color: var(--accent);
}

.feature-item h3 {
  font-size: 1rem;
  margin-bottom: 8px;
  color: var(--accent);
}

.feature-item p {
  color: var(--fg-muted);
  font-size: 0.9rem;
}

/* CLOSING */
.closing {
  padding: 120px 24px;
  text-align: center;
  background: radial-gradient(ellipse at 50% 100%, var(--accent-dim) 0%, transparent 60%);
}

.closing-inner {
  max-width: 720px;
  margin: 0 auto;
}

.closing h2 {
  font-size: clamp(1.5rem, 4vw, 2.2rem);
  margin-bottom: 16px;
}

.closing-sub {
  color: var(--fg-muted);
  font-size: 1.1rem;
}

/* FOOTER */
.site-footer {
  padding: 32px 24px;
  border-top: 1px solid var(--border);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-brand {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: 1rem;
}

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

/* RESPONSIVE */
@media (max-width: 640px) {
  .hero {
    min-height: auto;
    padding: 60px 20px 40px;
  }

  .flow-diagram {
    flex-direction: column;
    gap: 12px;
    padding: 20px;
  }

  .flow-arrow {
    transform: rotate(90deg);
  }

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

  .step {
    gap: 16px;
  }

  .step-number {
    width: 40px;
    height: 40px;
    font-size: 1rem;
  }
}