:root {
  --bg: #0a0a0f;
  --surface: #13131a;
  --accent: #6c63ff;
  --accent-hover: #5a52e0;
  --text: #e2e8f0;
  --text-muted: #94a3b8;
  --border: #1e1e2e;
  --radius: 12px;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: Inter, system-ui, -apple-system, sans-serif;
  line-height: 1.6;
}

/* Nav */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  color: var(--text);
  font-weight: 700;
  font-size: 1.1rem;
  text-decoration: none;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 2rem;
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  transition: color 0.15s;
}

.nav-links a:hover {
  color: var(--text);
}

/* Hero */
.hero {
  padding: 120px 24px 80px;
  text-align: center;
}

.hero .container {
  max-width: 800px;
  margin: 0 auto;
}

.hero-headline {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 1.5rem;
  background: linear-gradient(135deg, var(--accent), #a78bfa);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-sub {
  font-size: 1.25rem;
  color: var(--text-muted);
  margin-bottom: 2.5rem;
}

/* Button */
.btn-primary {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 0.875rem 2rem;
  border-radius: var(--radius);
  font-weight: 600;
  text-decoration: none;
  transition: background 0.2s;
  border: none;
  font-size: 1rem;
  cursor: pointer;
}

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

.btn-full {
  width: 100%;
  text-align: center;
}

/* Shared section layout */
.features,
.how-it-works,
.contact {
  padding: 80px 24px;
}

.features .container,
.how-it-works .container,
.contact .container {
  max-width: 1100px;
  margin: 0 auto;
}

.container--narrow {
  max-width: 600px !important;
}

/* Section headings */
h2.section-heading {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  margin-bottom: 1rem;
  text-align: center;
}

/* Features */
.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  margin-top: 3rem;
}

@media (max-width: 900px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 500px) {
  .features-grid {
    grid-template-columns: 1fr;
  }
}

.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 32px rgba(108, 99, 255, 0.15);
}

.feature-icon {
  font-size: 2rem;
  margin-bottom: 1rem;
  color: var(--accent);
}

.feature-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.feature-desc {
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* How It Works */
.how-it-works .container {
  max-width: 700px;
}

.steps {
  margin-top: 3rem;
}

.step {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
  margin-bottom: 2rem;
}

.step-number {
  background: var(--accent);
  color: #fff;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  flex-shrink: 0;
  font-size: 1rem;
}

.step-title {
  font-weight: 600;
  margin-bottom: 0.25rem;
  font-size: 1.05rem;
}

.step-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* Contact */
.contact-sub {
  text-align: center;
  color: var(--text-muted);
  margin-bottom: 2.5rem;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-field label {
  display: block;
  margin-bottom: 0.375rem;
  font-weight: 500;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.form-field input,
.form-field textarea {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  color: var(--text);
  font-size: 1rem;
  font-family: inherit;
  transition: border-color 0.15s;
}

.form-field input:focus,
.form-field textarea:focus {
  border-color: var(--accent);
  outline: none;
}

.form-field textarea {
  min-height: 120px;
  resize: vertical;
}

.contact-form .btn-primary {
  width: 100%;
  padding: 1rem;
}

.contact-form .btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.contact-status {
  text-align: center;
  font-size: 0.95rem;
  margin-top: 0.25rem;
}

/* Footer */
.footer {
  text-align: center;
  padding: 2rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
  font-size: 0.875rem;
}