/* Reset & Base */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: #1e293b;
  background: #ffffff;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

/* Typography */
h1 { font-size: clamp(2rem, 5vw, 3.5rem); font-weight: 800; line-height: 1.1; letter-spacing: -0.02em; }
h2 { font-size: clamp(1.5rem, 3vw, 2.25rem); font-weight: 700; line-height: 1.2; }
h3 { font-size: 1.25rem; font-weight: 600; }
p { font-size: 1.125rem; color: #475569; }

/* Layout */
.container { max-width: 1120px; margin: 0 auto; padding: 0 1.5rem; }
section { padding: 5rem 0; }

/* Nav */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid #e2e8f0;
  padding: 1rem 0;
}
nav .container { display: flex; align-items: center; justify-content: space-between; }
.logo { font-size: 1.5rem; font-weight: 800; color: #0f172a; }
.logo span { color: #3b82f6; }
.nav-cta {
  background: #3b82f6; color: #fff;
  padding: 0.5rem 1.25rem; border-radius: 8px;
  font-weight: 600; font-size: 0.95rem;
  transition: background 0.2s;
}
.nav-cta:hover { background: #2563eb; }

/* Hero */
.hero {
  padding: 8rem 0 5rem;
  background: linear-gradient(135deg, #f8fafc 0%, #eef2ff 50%, #f0f9ff 100%);
}
.hero .container { text-align: center; max-width: 800px; }
.hero .badge {
  display: inline-block;
  background: #dbeafe; color: #1d4ed8;
  font-size: 0.875rem; font-weight: 600;
  padding: 0.375rem 1rem; border-radius: 999px;
  margin-bottom: 1.5rem;
}
.hero h1 { margin-bottom: 1.5rem; color: #0f172a; }
.hero p { font-size: 1.25rem; color: #64748b; max-width: 600px; margin: 0 auto 2.5rem; }

/* CTA Buttons */
.cta-primary {
  display: inline-block;
  background: #3b82f6; color: #fff;
  padding: 1rem 2.5rem; border-radius: 12px;
  font-size: 1.125rem; font-weight: 700;
  transition: all 0.2s; border: none; cursor: pointer;
}
.cta-primary:hover { background: #2563eb; transform: translateY(-1px); box-shadow: 0 4px 12px rgba(59,130,246,0.4); }
.cta-secondary {
  display: inline-block;
  color: #3b82f6; font-weight: 600; font-size: 1rem;
  margin-left: 1.5rem;
}

/* How It Works */
.steps { background: #fff; }
.steps h2 { text-align: center; margin-bottom: 1rem; }
.steps .subtitle { text-align: center; max-width: 600px; margin: 0 auto 3.5rem; }
.steps-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2.5rem; }
.step {
  text-align: center; padding: 2rem;
  border-radius: 16px;
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  transition: transform 0.2s, box-shadow 0.2s;
}
.step:hover { transform: translateY(-4px); box-shadow: 0 8px 24px rgba(0,0,0,0.06); }
.step-number {
  display: inline-flex; align-items: center; justify-content: center;
  width: 3rem; height: 3rem; border-radius: 50%;
  background: #3b82f6; color: #fff;
  font-size: 1.25rem; font-weight: 700;
  margin-bottom: 1.25rem;
}
.step h3 { margin-bottom: 0.75rem; }
.step p { font-size: 1rem; }

/* Benefits */
.benefits { background: #0f172a; color: #fff; }
.benefits h2 { text-align: center; color: #fff; margin-bottom: 1rem; }
.benefits .subtitle { text-align: center; color: #94a3b8; max-width: 600px; margin: 0 auto 3.5rem; }
.benefits-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; }
.benefit {
  padding: 2rem; border-radius: 16px;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
}
.benefit-icon { font-size: 2rem; margin-bottom: 1rem; }
.benefit h3 { color: #fff; margin-bottom: 0.5rem; }
.benefit p { color: #94a3b8; font-size: 1rem; }

/* Signup Section */
.signup { background: linear-gradient(135deg, #eef2ff, #f0f9ff); }
.signup .container { text-align: center; max-width: 600px; }
.signup h2 { margin-bottom: 1rem; }
.signup p { margin-bottom: 2rem; }
.signup-form { display: flex; gap: 0.75rem; max-width: 480px; margin: 0 auto; }
.signup-form input {
  flex: 1; padding: 1rem 1.25rem;
  border: 2px solid #e2e8f0; border-radius: 12px;
  font-size: 1rem; outline: none;
  transition: border-color 0.2s;
}
.signup-form input:focus { border-color: #3b82f6; }
.signup-form button {
  background: #3b82f6; color: #fff;
  padding: 1rem 2rem; border: none; border-radius: 12px;
  font-size: 1rem; font-weight: 700; cursor: pointer;
  white-space: nowrap; transition: background 0.2s;
}
.signup-form button:hover { background: #2563eb; }
.form-note { font-size: 0.875rem; color: #94a3b8; margin-top: 0.75rem; }
.form-success {
  display: none; padding: 1rem;
  background: #dcfce7; color: #166534;
  border-radius: 12px; font-weight: 600;
  margin-top: 1rem;
}

/* Footer */
footer {
  background: #0f172a; color: #94a3b8;
  padding: 2rem 0; text-align: center;
  font-size: 0.875rem;
}

/* Use Cases */
.usecases { background: #fff; }
.usecases h2 { text-align: center; margin-bottom: 1rem; }
.usecases .subtitle { text-align: center; color: #64748b; max-width: 600px; margin: 0 auto 3rem; }
.usecase-list { max-width: 700px; margin: 0 auto; display: flex; flex-direction: column; gap: 1.25rem; }
.usecase-item {
  display: flex; align-items: flex-start; gap: 1rem;
  padding: 1.5rem; border-radius: 12px;
  background: #f8fafc; border: 1px solid #e2e8f0;
}
.usecase-item .icon { font-size: 1.5rem; flex-shrink: 0; }
.usecase-item h3 { margin-bottom: 0.25rem; }
.usecase-item p { font-size: 0.95rem; }

/* Responsive */
@media (max-width: 768px) {
  .steps-grid, .benefits-grid { grid-template-columns: 1fr; }
  .signup-form { flex-direction: column; }
  .cta-secondary { margin-left: 0; margin-top: 1rem; display: block; }
  section { padding: 3.5rem 0; }
}