:root {
  --bg: #0a0a0f;
  --bg-elevated: #12121a;
  --bg-card: #1a1a25;
  --fg: #e8e8ed;
  --fg-muted: #8888a0;
  --accent: #f59e0b;
  --accent-glow: rgba(245, 158, 11, 0.15);
  --accent-bright: #fbbf24;
  --red: #ef4444;
  --green: #22c55e;
  --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;
}

html {
  scroll-behavior: smooth;
}

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* === NAV === */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 10, 15, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--fg);
}

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

.nav-cta {
  display: inline-block;
  padding: 8px 20px;
  background: var(--accent);
  color: #000;
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 600;
  border-radius: 8px;
  text-decoration: none;
  transition: background 0.15s;
}

.nav-cta:hover {
  background: var(--accent-bright);
}

/* === HERO === */
.hero {
  position: relative;
  padding: 120px 24px 100px;
  text-align: center;
  overflow: hidden;
}

.hero-inner {
  max-width: 720px;
  margin: 0 auto;
  position: relative;
  z-index: 2;
}

.hero-badge {
  display: inline-block;
  padding: 6px 16px;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid rgba(245, 158, 11, 0.3);
  border-radius: 100px;
  margin-bottom: 32px;
  font-family: var(--font-display);
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(36px, 6vw, 64px);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 24px;
  letter-spacing: -1.5px;
}

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

.lede {
  font-size: 19px;
  color: var(--fg-muted);
  max-width: 540px;
  margin: 0 auto 48px;
  line-height: 1.7;
}

.hero-stat {
  display: inline-block;
  padding: 24px 40px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.stat-number {
  font-family: var(--font-display);
  font-size: 48px;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
}

.stat-unit {
  font-size: 24px;
  font-weight: 500;
  color: var(--fg-muted);
}

.stat-label {
  font-size: 14px;
  color: var(--fg-muted);
  margin-top: 8px;
}

.hero-actions {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 28px;
}

.hero-btn-primary {
  display: inline-block;
  padding: 16px 36px;
  background: var(--accent);
  color: #000;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  border-radius: 10px;
  text-decoration: none;
  transition: background 0.15s, transform 0.1s;
  letter-spacing: -0.2px;
}

.hero-btn-primary:hover {
  background: var(--accent-bright);
  transform: translateY(-1px);
}

.hero-glow {
  position: absolute;
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  pointer-events: none;
  z-index: 1;
}

/* === PROBLEM === */
.problem {
  padding: 100px 24px;
  background: var(--bg);
}

.problem-inner {
  max-width: 960px;
  margin: 0 auto;
}

.section-label {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--accent);
  margin-bottom: 48px;
}

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

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

.problem-icon {
  font-size: 28px;
  margin-bottom: 16px;
  color: var(--red);
}

.problem-card h3 {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 12px;
  letter-spacing: -0.3px;
}

.problem-card p {
  color: var(--fg-muted);
  font-size: 15px;
  line-height: 1.6;
}

/* === FEATURES === */
.features {
  padding: 100px 24px;
  background: var(--bg-elevated);
}

.features-inner {
  max-width: 720px;
  margin: 0 auto;
}

.feature-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.feature-item {
  display: flex;
  gap: 32px;
  padding: 40px 0;
  border-bottom: 1px solid var(--border);
}

.feature-item:last-child {
  border-bottom: none;
}

.feature-number {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
  min-width: 36px;
  padding-top: 4px;
}

.feature-content h3 {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 8px;
  letter-spacing: -0.3px;
}

.feature-content p {
  color: var(--fg-muted);
  font-size: 16px;
  line-height: 1.7;
}

/* === MATH === */
.math {
  padding: 100px 24px;
  background: var(--bg);
}

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

.math-comparison {
  display: flex;
  align-items: center;
  gap: 24px;
  justify-content: center;
}

.math-card {
  flex: 1;
  padding: 40px 32px;
  border-radius: var(--radius);
  max-width: 340px;
}

.math-old {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  opacity: 0.7;
}

.math-new {
  background: var(--bg-card);
  border: 1px solid rgba(245, 158, 11, 0.3);
  box-shadow: 0 0 60px var(--accent-glow);
}

.math-card-label {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--fg-muted);
  margin-bottom: 16px;
}

.math-new .math-card-label {
  color: var(--accent);
}

.math-price {
  font-family: var(--font-display);
  font-size: 48px;
  font-weight: 700;
  line-height: 1;
}

.math-new .math-price {
  color: var(--accent);
}

.math-period {
  font-size: 16px;
  color: var(--fg-muted);
  margin-bottom: 24px;
}

.math-card ul {
  list-style: none;
  padding: 0;
}

.math-card li {
  font-size: 14px;
  color: var(--fg-muted);
  padding: 6px 0;
  padding-left: 20px;
  position: relative;
}

.math-old li::before {
  content: '\00D7';
  position: absolute;
  left: 0;
  color: var(--red);
  font-weight: 600;
}

.math-new li::before {
  content: '\2713';
  position: absolute;
  left: 0;
  color: var(--green);
  font-weight: 600;
}

.math-vs {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--fg-muted);
}

/* === CLOSING === */
.closing {
  padding: 120px 24px;
  text-align: center;
  background: var(--bg-elevated);
}

.closing-inner {
  max-width: 600px;
  margin: 0 auto;
}

.closing h2 {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 700;
  letter-spacing: -1px;
  margin-bottom: 16px;
}

.closing p {
  font-size: 19px;
  color: var(--fg-muted);
  line-height: 1.7;
  margin-bottom: 40px;
}

.closing-btn {
  display: inline-block;
  padding: 16px 40px;
  background: var(--accent);
  color: #000;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  border-radius: 10px;
  text-decoration: none;
  transition: background 0.15s, transform 0.1s;
}

.closing-btn:hover {
  background: var(--accent-bright);
  transform: translateY(-1px);
}

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

.footer-brand {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 4px;
}

.footer-tagline {
  font-size: 14px;
  color: var(--fg-muted);
}

/* === RESPONSIVE === */
@media (max-width: 768px) {
  .problem-grid {
    grid-template-columns: 1fr;
  }
  
  .math-comparison {
    flex-direction: column;
  }
  
  .math-card {
    max-width: 100%;
    width: 100%;
  }
  
  .math-vs {
    padding: 8px 0;
  }
  
  .feature-item {
    flex-direction: column;
    gap: 12px;
  }
  
  .hero {
    padding: 80px 20px 60px;
  }

  .hero-stat {
    padding: 20px 28px;
  }

  .stat-number {
    font-size: 36px;
  }

  .hero-btn-primary {
    font-size: 15px;
    padding: 14px 28px;
  }

  .closing-btn {
    font-size: 15px;
    padding: 14px 28px;
  }
}