:root {
  --bg: #0a0a0f;
  --bg-card: #14141f;
  --fg: #e8e8ed;
  --fg-muted: #8888a0;
  --accent: #00e599;
  --accent-dim: rgba(0, 229, 153, 0.12);
  --border: #1e1e2e;
  --radius: 12px;
}

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

body {
  background: var(--bg);
  color: var(--fg);
  font-family: 'DM Sans', sans-serif;
  font-size: 16px;
  line-height: 1.6;
  overflow-x: hidden;
}

h1, h2, h3 {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  line-height: 1.1;
}

/* Hero */
.hero {
  min-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px 24px;
  background: radial-gradient(ellipse at 50% 0%, rgba(0, 229, 153, 0.06) 0%, transparent 60%);
}

.hero-content {
  max-width: 680px;
  text-align: center;
}

.badge {
  display: inline-block;
  padding: 6px 16px;
  background: var(--accent-dim);
  color: var(--accent);
  border-radius: 100px;
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 32px;
  letter-spacing: 0.02em;
}

.hero h1 {
  font-size: clamp(2.5rem, 6vw, 4rem);
  margin-bottom: 24px;
}

.accent {
  color: var(--accent);
}

.lede {
  font-size: 1.125rem;
  color: var(--fg-muted);
  max-width: 520px;
  margin: 0 auto 40px;
}

/* Hero CTA */
.hero-cta {
  display: inline-block;
  padding: 16px 36px;
  background: var(--accent);
  color: var(--bg);
  border-radius: var(--radius);
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: 1rem;
  text-decoration: none;
  margin-bottom: 32px;
  transition: opacity 0.15s, transform 0.1s;
  letter-spacing: 0.01em;
}

.hero-cta:hover {
  opacity: 0.9;
}

.hero-cta:active {
  transform: scale(0.98);
}

.supported {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

.carrier {
  padding: 8px 18px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  color: var(--fg-muted);
  font-weight: 500;
}

/* How It Works */
.how-it-works {
  padding: 100px 24px;
  max-width: 900px;
  margin: 0 auto;
}

.how-it-works h2 {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  margin-bottom: 60px;
  text-align: center;
}

.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 32px;
}

.step {
  padding: 32px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  position: relative;
}

.step-number {
  width: 36px;
  height: 36px;
  background: var(--accent);
  color: var(--bg);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: 16px;
  margin-bottom: 20px;
}

.step h3 {
  font-size: 1.2rem;
  margin-bottom: 12px;
}

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

/* Phones */
.phones {
  padding: 100px 24px;
  max-width: 900px;
  margin: 0 auto;
}

.phones h2 {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  margin-bottom: 16px;
  text-align: center;
}

.section-sub {
  color: var(--fg-muted);
  text-align: center;
  max-width: 560px;
  margin: 0 auto 48px;
}

.phone-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 16px;
}

.phone-card {
  padding: 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-align: center;
  transition: border-color 0.2s;
}

.phone-card:hover {
  border-color: var(--accent);
}

.phone-name {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  font-size: 1rem;
  margin-bottom: 4px;
}

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

/* Closing */
.closing {
  padding: 100px 24px;
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
}

.closing h2 {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  margin-bottom: 20px;
}

.closing p {
  color: var(--fg-muted);
  font-size: 1.05rem;
  margin-bottom: 40px;
}

.values {
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: center;
}

.value {
  padding: 12px 24px;
  background: var(--accent-dim);
  color: var(--accent);
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 500;
}

/* Footer */
footer {
  padding: 60px 24px;
  border-top: 1px solid var(--border);
  text-align: center;
}

.footer-brand {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: 1.2rem;
  margin-bottom: 8px;
}

.footer-tagline {
  color: var(--fg-muted);
  font-size: 0.9rem;
  margin-bottom: 8px;
}

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

/* Mobile */
@media (max-width: 600px) {
  .hero {
    min-height: auto;
    padding: 60px 20px;
  }
  
  .steps {
    grid-template-columns: 1fr;
  }
  
  .phone-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .how-it-works,
  .phones,
  .closing {
    padding: 60px 20px;
  }
}