:root {
  --bg: #0a0a0f;
  --bg-elevated: #12121a;
  --bg-card: #1a1a25;
  --fg: #e8e8ed;
  --fg-muted: #8a8a9a;
  --accent: #4ade80;
  --accent-dim: rgba(74, 222, 128, 0.12);
  --accent-glow: rgba(74, 222, 128, 0.25);
  --red-muted: #f87171;
  --border: rgba(255, 255, 255, 0.06);
  --radius: 12px;
  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'DM Sans', sans-serif;
}

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

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

/* ========== HERO ========== */
.hero {
  min-height: 90vh;
  display: flex;
  align-items: center;
  padding: 120px 24px 80px;
  background:
    radial-gradient(ellipse 60% 50% at 70% 0%, var(--accent-glow) 0%, transparent 70%),
    radial-gradient(ellipse 40% 40% at 20% 80%, rgba(99, 102, 241, 0.08) 0%, transparent 60%),
    var(--bg);
}

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

.hero-badge {
  display: inline-block;
  padding: 6px 16px;
  border-radius: 100px;
  background: var(--accent-dim);
  color: var(--accent);
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 32px;
}

.hero h1 {
  font-size: clamp(2.8rem, 6vw, 5rem);
  margin-bottom: 28px;
}

.hero h1 .accent {
  color: var(--accent);
}

.hero .lede {
  font-size: 1.2rem;
  color: var(--fg-muted);
  max-width: 600px;
  line-height: 1.7;
  margin-bottom: 56px;
}

.hero-stats {
  display: flex;
  align-items: center;
  gap: 32px;
  padding: 28px 36px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  width: fit-content;
}

.stat-number {
  display: block;
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--accent);
}

.stat-label {
  display: block;
  font-size: 0.82rem;
  color: var(--fg-muted);
  margin-top: 4px;
}

.stat-divider {
  width: 1px;
  height: 48px;
  background: var(--border);
}

/* ========== PROBLEM ========== */
.problem {
  padding: 100px 24px;
  background: var(--bg-elevated);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.problem-inner {
  max-width: 1080px;
  margin: 0 auto;
}

.problem-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.problem-text h2 {
  font-size: 2.4rem;
  margin-bottom: 20px;
}

.problem-text p {
  color: var(--fg-muted);
  margin-bottom: 16px;
  line-height: 1.75;
}

.problem-highlight {
  color: var(--red-muted) !important;
  font-weight: 500;
  font-family: var(--font-display);
}

.comparison-card {
  padding: 28px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg-card);
}

.comparison-card.old {
  margin-bottom: 20px;
  opacity: 0.7;
}

.comparison-card.new {
  border-color: var(--accent);
  box-shadow: 0 0 40px var(--accent-dim);
}

.comparison-header {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1rem;
  margin-bottom: 16px;
  letter-spacing: 0.02em;
}

.comparison-card.new .comparison-header {
  color: var(--accent);
}

.comparison-card ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.comparison-card li {
  font-size: 0.92rem;
  color: var(--fg-muted);
  padding-left: 20px;
  position: relative;
}

.comparison-card.old li::before {
  content: '\2715';
  position: absolute;
  left: 0;
  color: var(--red-muted);
  font-size: 0.8rem;
}

.comparison-card.new li::before {
  content: '\2713';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-size: 0.85rem;
}

/* ========== FEATURES ========== */
.features {
  padding: 100px 24px;
}

.features-inner {
  max-width: 1080px;
  margin: 0 auto;
}

.features h2 {
  font-size: 2.4rem;
  margin-bottom: 12px;
}

.features-sub {
  color: var(--fg-muted);
  font-size: 1.1rem;
  margin-bottom: 60px;
  max-width: 520px;
}

.features-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.feature-card {
  padding: 36px;
  border-radius: var(--radius);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  transition: border-color 0.25s;
}

.feature-card:hover {
  border-color: rgba(74, 222, 128, 0.2);
}

.feature-icon {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 2rem;
  color: var(--accent);
  margin-bottom: 20px;
  opacity: 0.6;
}

.feature-card h3 {
  font-size: 1.25rem;
  margin-bottom: 12px;
}

.feature-card p {
  font-size: 0.95rem;
  color: var(--fg-muted);
  line-height: 1.7;
}

/* ========== HOW (USE CASES) ========== */
.how {
  padding: 100px 24px;
  background: var(--bg-elevated);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.how-inner {
  max-width: 1080px;
  margin: 0 auto;
}

.how h2 {
  font-size: 2.4rem;
  margin-bottom: 12px;
}

.how-sub {
  color: var(--fg-muted);
  font-size: 1.05rem;
  max-width: 640px;
  margin-bottom: 56px;
  line-height: 1.75;
}

.how-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.how-item {
  padding: 32px;
  border-radius: var(--radius);
  background: var(--bg-card);
  border: 1px solid var(--border);
}

.how-label {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
  margin-bottom: 14px;
}

.how-item p {
  font-size: 0.92rem;
  color: var(--fg-muted);
  line-height: 1.7;
}

/* ========== CLOSING ========== */
.closing {
  padding: 120px 24px;
  text-align: center;
  background:
    radial-gradient(ellipse 50% 40% at 50% 100%, var(--accent-glow) 0%, transparent 70%),
    var(--bg);
}

.closing-inner {
  max-width: 680px;
  margin: 0 auto;
}

.closing h2 {
  font-size: 2.6rem;
  margin-bottom: 20px;
}

.closing-text {
  color: var(--fg-muted);
  font-size: 1.1rem;
  line-height: 1.75;
  margin-bottom: 48px;
}

.closing-vision {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--accent);
  padding: 24px 36px;
  background: var(--accent-dim);
  border-radius: var(--radius);
  display: inline-block;
}

/* ========== FOOTER ========== */
.site-footer {
  padding: 48px 24px;
  border-top: 1px solid var(--border);
  text-align: center;
}

.footer-brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.2rem;
  margin-bottom: 6px;
}

.footer-tagline {
  color: var(--fg-muted);
  font-size: 0.88rem;
}

/* ========== RESPONSIVE ========== */
@media (max-width: 768px) {
  .hero {
    min-height: auto;
    padding: 80px 20px 60px;
  }

  .hero-stats {
    flex-direction: column;
    gap: 20px;
    width: 100%;
  }

  .stat-divider {
    width: 48px;
    height: 1px;
  }

  .problem-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .how-grid {
    grid-template-columns: 1fr;
  }

  .problem,
  .features,
  .how,
  .closing {
    padding: 64px 20px;
  }

  h2 {
    font-size: 2rem !important;
  }

  .closing h2 {
    font-size: 2.1rem !important;
  }
}

/* CTA Button for landing page hero */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius);
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  text-decoration: none;
  transition: opacity 0.15s, transform 0.1s;
}
.btn:hover { opacity: 0.85; text-decoration: none; }
.btn:active { transform: scale(0.98); }
.btn-primary { background: var(--accent); color: #0a0f0a; }