:root {
  --bg-primary: #0a0e1a;
  --bg-secondary: #111827;
  --bg-card: #151c2e;
  --bg-card-hover: #1a2338;
  --text-primary: #f0f2f5;
  --text-secondary: #8b95a8;
  --text-muted: #5a6478;
  --accent: #00d4aa;
  --accent-glow: rgba(0, 212, 170, 0.15);
  --accent-dim: #00a887;
  --border: #1e2740;
  --border-accent: rgba(0, 212, 170, 0.25);
  --gradient-hero: linear-gradient(165deg, #0a0e1a 0%, #0d1525 40%, #0f1a2e 100%);
  --radius: 12px;
  --radius-lg: 20px;
  --max-width: 1120px;
  --font-display: 'Space Grotesk', system-ui, sans-serif;
  --font-body: 'DM Sans', system-ui, sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* NAV */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 16px 0;
  background: rgba(10, 14, 26, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text-primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-logo .os-badge {
  font-size: 0.65rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-glow);
  padding: 2px 8px;
  border-radius: 6px;
  border: 1px solid var(--border-accent);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  font-size: 0.875rem;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s;
}

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

/* HERO */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: var(--gradient-hero);
  position: relative;
  padding-top: 80px;
}

.hero::before {
  content: '';
  position: absolute;
  top: -200px;
  right: -200px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(0, 212, 170, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border), transparent);
}

.hero-content {
  max-width: 720px;
}

.hero-eyebrow {
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.hero-eyebrow::before {
  content: '';
  width: 24px;
  height: 2px;
  background: var(--accent);
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}

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

.hero .lede {
  font-size: 1.2rem;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 560px;
  margin-bottom: 48px;
}

.hero-stats {
  display: flex;
  gap: 48px;
  padding-top: 40px;
  border-top: 1px solid var(--border);
}

.hero-stat .number {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--accent);
  display: block;
}

.hero-stat .label {
  font-size: 0.825rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* PROBLEM */
.problem {
  padding: 120px 0;
  position: relative;
}

.problem::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border), transparent);
}

.problem-header {
  max-width: 600px;
  margin-bottom: 64px;
}

.section-label {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.problem-header h2 {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.problem-header p {
  color: var(--text-secondary);
  font-size: 1.05rem;
}

.pain-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.pain-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: border-color 0.3s, background 0.3s;
}

.pain-card:hover {
  border-color: var(--border-accent);
  background: var(--bg-card-hover);
}

.pain-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: var(--accent-glow);
  border: 1px solid var(--border-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  margin-bottom: 20px;
}

.pain-card h3 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 10px;
}

.pain-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* FEATURES */
.features {
  padding: 120px 0;
  background: var(--bg-secondary);
  position: relative;
}

.features-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 72px;
}

.features-header h2 {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.features-header p {
  color: var(--text-secondary);
  font-size: 1.05rem;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 32px;
  position: relative;
  overflow: hidden;
  transition: border-color 0.3s, transform 0.2s;
}

.feature-card:hover {
  border-color: var(--border-accent);
  transform: translateY(-2px);
}

.feature-card.featured {
  grid-column: span 2;
  background: linear-gradient(135deg, var(--bg-card) 0%, rgba(0, 212, 170, 0.04) 100%);
  border-color: var(--border-accent);
}

.feature-tag {
  font-family: var(--font-display);
  font-size: 0.65rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-glow);
  border: 1px solid var(--border-accent);
  padding: 3px 10px;
  border-radius: 6px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: inline-block;
  margin-bottom: 16px;
}

.feature-card h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 10px;
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.65;
}

.feature-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px 32px;
  margin-top: 20px;
}

.feature-list li {
  font-size: 0.85rem;
  color: var(--text-secondary);
  padding-left: 18px;
  position: relative;
}

.feature-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
}

/* COMPARISON */
.comparison {
  padding: 120px 0;
  position: relative;
}

.comparison::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border), transparent);
}

.comparison-header {
  text-align: center;
  max-width: 600px;
  margin: 0 auto 64px;
}

.comparison-header h2 {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.comparison-header p {
  color: var(--text-secondary);
  font-size: 1.05rem;
}

.comparison-table-wrap {
  overflow-x: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

.comparison-table thead {
  background: var(--bg-card);
}

.comparison-table th {
  font-family: var(--font-display);
  font-weight: 600;
  text-align: left;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

.comparison-table th:last-child {
  color: var(--accent);
}

.comparison-table td {
  padding: 14px 20px;
  border-bottom: 1px solid var(--border);
  color: var(--text-secondary);
}

.comparison-table tr:last-child td { border-bottom: none; }

.comparison-table td:first-child {
  font-weight: 500;
  color: var(--text-primary);
}

.comparison-table td:last-child {
  color: var(--accent);
  font-weight: 600;
}

.check { color: var(--accent); }
.cross { color: var(--text-muted); }

/* CLOSING */
.closing {
  padding: 140px 0;
  text-align: center;
  position: relative;
  background: var(--bg-secondary);
}

.closing::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(0, 212, 170, 0.07) 0%, transparent 65%);
  pointer-events: none;
}

.closing h2 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4.5vw, 3rem);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.03em;
  max-width: 700px;
  margin: 0 auto 20px;
  position: relative;
}

.closing p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 520px;
  margin: 0 auto;
  position: relative;
}

/* FOOTER */
.footer {
  padding: 40px 0;
  border-top: 1px solid var(--border);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-brand {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.footer-note {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* RESPONSIVE */
@media (max-width: 768px) {
  .nav-links { display: none; }
  
  .hero { padding-top: 100px; min-height: auto; padding-bottom: 80px; }
  .hero-stats { flex-direction: column; gap: 24px; }
  
  .pain-grid { grid-template-columns: 1fr; }
  
  .features-grid { grid-template-columns: 1fr; }
  .feature-card.featured { grid-column: span 1; }
  .feature-list { grid-template-columns: 1fr; }
  
  .comparison-table { font-size: 0.8rem; }
  .comparison-table th,
  .comparison-table td { padding: 10px 12px; }
  
  .footer-inner { flex-direction: column; gap: 12px; text-align: center; }
  
  .problem, .features, .comparison { padding: 80px 0; }
  .closing { padding: 100px 0; }
}