/* Reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #1a1a2e;
  --bg-alt: #0f0f1a;
  --card: #252547;
  --foreground: #ffffff;
  --muted: #999999;
  --accent: #E63946;
  --border: #2a2a4a;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--foreground);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Typography */
h1, h2, h3 { line-height: 1.2; font-weight: 800; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Layout */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Hero */
.hero {
  text-align: center;
  padding: 140px 24px 80px;
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: auto;
  opacity: 0.06;
  pointer-events: none;
  z-index: 0;
}
.hero h1,
.hero .tagline,
.hero .btn {
  position: relative;
  z-index: 1;
}
.hero h1 {
  font-size: 3rem;
  font-weight: 900;
  letter-spacing: 0.3em;
  margin-bottom: 16px;
}
.hero .tagline {
  font-size: 1.25rem;
  color: var(--muted);
  margin-bottom: 32px;
}

/* Buttons */
.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  font-size: 1.125rem;
  font-weight: 700;
  padding: 16px 40px;
  border-radius: 12px;
  border: none;
  cursor: pointer;
  transition: opacity 0.2s;
}
.btn:hover { opacity: 0.9; text-decoration: none; }
.btn-full { display: block; width: 100%; text-align: center; }

/* Sections */
section { padding: 64px 24px; }
section.alt { background: var(--bg-alt); }
.section-title {
  font-size: 1.75rem;
  margin-bottom: 32px;
  text-align: center;
}

/* What is BigDogs */
.what-content {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}
.what-content p {
  color: var(--muted);
  font-size: 1.125rem;
  line-height: 1.7;
}

/* Steps */
.steps {
  display: flex;
  flex-direction: column;
  gap: 24px;
  max-width: 800px;
  margin: 0 auto;
}
.step {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}
.step-num {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  background: var(--accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.125rem;
  line-height: 1;
}
.step-text h3 {
  font-size: 1.0625rem;
  margin-bottom: 4px;
}
.step-text p {
  color: var(--muted);
  font-size: 0.9375rem;
}

/* Features */
.features-grid {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 800px;
  margin: 0 auto;
}
.feature-card {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
}
section.alt .feature-card {
  background: var(--bg);
}
.feature-icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  color: var(--accent);
}
.feature-card h3 {
  font-size: 0.9375rem;
  font-weight: 700;
  margin-bottom: 4px;
}
.feature-card p {
  color: var(--muted);
  font-size: 0.8125rem;
}

/* Footer CTA */
.footer-cta {
  text-align: center;
  padding: 80px 24px 64px;
  max-width: 1200px;
  margin: 0 auto;
}
.footer-cta h2 {
  font-size: 2rem;
  margin-bottom: 24px;
}
.footer-cta .sub {
  color: #666;
  font-size: 0.875rem;
  margin-top: 20px;
}

/* Footer */
footer {
  text-align: center;
  padding: 24px;
  color: #555;
  font-size: 0.75rem;
  border-top: 1px solid var(--border);
}

/* Desktop */
@media (min-width: 768px) {
  .hero { padding: 160px 40px 100px; }
  .hero-bg { width: 900px; }
  .hero h1 { font-size: 4rem; }
  .hero .tagline { font-size: 1.5rem; }
  .hero .btn { width: 300px; }

  section { padding: 80px 40px; }
  .section-title { font-size: 2rem; }

  .steps {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    max-width: 900px;
  }
  .step {
    background: var(--card);
    border-radius: 12px;
    padding: 24px;
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .features-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 20px;
    max-width: 1000px;
  }
  .feature-card {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .footer-cta h2 { font-size: 2.5rem; }
  .footer-cta .btn { width: 300px; }
}