:root {
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-green: #16a34a;
  --color-text: #1f2937;
  --color-muted: #6b7280;
  --color-border: #e5e7eb;
  --color-bg-soft: #f8fafc;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  color: var(--color-text);
  line-height: 1.5;
}

h1, h2, h3 { line-height: 1.25; margin: 0; }

/* Top bar */
#topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 32px;
  max-width: 1100px;
  margin: 0 auto;
}

.logo {
  font-size: 18px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-cta {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 600;
  font-size: 14px;
  padding: 8px 16px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
}

.nav-cta:hover { background: var(--color-bg-soft); }

/* Hero */
.hero {
  max-width: 720px;
  margin: 0 auto;
  padding: 60px 24px 80px;
  text-align: center;
}

.hero h1 {
  font-size: 44px;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.hero-sub {
  font-size: 18px;
  color: var(--color-muted);
  margin: 20px 0 32px;
}

.hero-hint {
  font-size: 13px;
  color: var(--color-muted);
  margin-top: 14px;
}

.btn-primary {
  display: inline-block;
  background: var(--color-primary);
  color: white;
  text-decoration: none;
  font-weight: 700;
  font-size: 16px;
  padding: 14px 32px;
  border-radius: 10px;
}

.btn-primary:hover { background: var(--color-primary-dark); }

/* Problems */
.problems {
  background: var(--color-bg-soft);
  padding: 64px 24px;
}

.problems h2, .solution h2, .how-it-works h2, .cta-final h2 {
  text-align: center;
  font-size: 28px;
  font-weight: 800;
  max-width: 700px;
  margin: 0 auto 40px;
}

.problem-grid {
  max-width: 1000px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}

.problem-card {
  background: white;
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 24px;
}

.problem-icon { font-size: 28px; margin-bottom: 12px; }

.problem-card h3 { font-size: 16px; margin-bottom: 8px; }

.problem-card p {
  font-size: 14px;
  color: var(--color-muted);
  margin: 0;
}

/* Solution */
.solution {
  max-width: 800px;
  margin: 0 auto;
  padding: 80px 24px;
}

.feature-list {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.feature-row h3 { font-size: 18px; margin-bottom: 8px; }

.feature-row p {
  font-size: 15px;
  color: var(--color-muted);
  margin: 0;
}

/* How it works */
.how-it-works {
  background: var(--color-bg-soft);
  padding: 80px 24px;
}

.steps {
  max-width: 900px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 32px;
  text-align: center;
}

.step-number {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--color-primary);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  margin: 0 auto 16px;
}

.step h3 { font-size: 16px; margin-bottom: 8px; }

.step p {
  font-size: 14px;
  color: var(--color-muted);
  margin: 0;
}

/* Final CTA */
.cta-final {
  max-width: 600px;
  margin: 0 auto;
  padding: 80px 24px;
  text-align: center;
}

/* Footer */
footer {
  text-align: center;
  padding: 32px 24px;
  color: var(--color-muted);
  font-size: 13px;
  border-top: 1px solid var(--color-border);
}

@media (max-width: 640px) {
  .hero h1 { font-size: 32px; }
}