:root {
  --bg: #0a0a0a;
  --fg: #f0f0f0;
  --fg-muted: #888;
  --accent: #c8ff00;
  --accent-dim: rgba(200, 255, 0, 0.12);
  --card-bg: #141414;
  --card-border: #222;
  --font-display: 'Syne', 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;
}

/* === HERO === */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 2rem;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -30%;
  left: -20%;
  width: 60vw;
  height: 60vw;
  background: radial-gradient(circle, rgba(200,255,0,0.06) 0%, transparent 70%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 1;
  max-width: 800px;
}

.hero-badge {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid rgba(200,255,0,0.3);
  padding: 0.4rem 1.2rem;
  border-radius: 100px;
  margin-bottom: 2rem;
}

.hero-number {
  font-family: var(--font-display);
  font-size: clamp(8rem, 20vw, 16rem);
  font-weight: 800;
  line-height: 0.85;
  color: var(--accent);
  letter-spacing: -0.04em;
  margin-bottom: 0.5rem;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
}

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

.hero-sub {
  font-size: 1.05rem;
  color: var(--fg-muted);
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.7;
}

.hero-scroll-hint {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
}

.scroll-line {
  width: 1px;
  height: 48px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 1; }
}

/* === SECTIONS === */
.section-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 6rem 2rem;
}

.section-label {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  font-weight: 700;
  margin-bottom: 3rem;
  letter-spacing: -0.02em;
}

/* === WHAT === */
.what {
  border-top: 1px solid var(--card-border);
}

.what-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.what-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: 2rem;
  transition: border-color 0.3s;
}

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

.what-icon {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--accent);
  margin-bottom: 1rem;
  letter-spacing: 0.05em;
}

.what-card h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.6rem;
}

.what-card p {
  font-size: 0.92rem;
  color: var(--fg-muted);
  line-height: 1.6;
}

/* === WHO === */
.who {
  border-top: 1px solid var(--card-border);
}

.who-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

.who-item {
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--card-border);
}

.who-tag {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--bg);
  background: var(--accent);
  padding: 0.25rem 0.8rem;
  border-radius: 4px;
  margin-bottom: 0.8rem;
}

.who-item p {
  font-size: 0.95rem;
  color: var(--fg-muted);
  line-height: 1.6;
}

/* === MATH === */
.math {
  border-top: 1px solid var(--card-border);
}

.math-comparison {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.math-col {
  flex: 1;
  padding: 2.5rem;
  border-radius: 16px;
}

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

.math-new {
  background: var(--accent-dim);
  border: 1px solid rgba(200,255,0,0.25);
}

.math-col h3 {
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--fg-muted);
  margin-bottom: 1rem;
}

.math-price {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1;
  margin-bottom: 1rem;
  letter-spacing: -0.03em;
}

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

.math-price span {
  font-size: 0.4em;
  font-weight: 600;
  color: var(--fg-muted);
}

.math-col p {
  font-size: 0.92rem;
  color: var(--fg-muted);
  line-height: 1.6;
}

.math-vs {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--fg-muted);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  flex-shrink: 0;
}

/* === CLOSING === */
.closing {
  border-top: 1px solid var(--card-border);
  text-align: center;
}

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

.closing h2 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
}

.closing p {
  font-size: 1.05rem;
  color: var(--fg-muted);
  line-height: 1.8;
}

/* === FOOTER === */
.site-footer {
  border-top: 1px solid var(--card-border);
  padding: 3rem 2rem;
  text-align: center;
}

.footer-brand {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 0.4rem;
}

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

/* === RESPONSIVE === */
@media (max-width: 768px) {
  .what-grid {
    grid-template-columns: 1fr;
  }
  
  .who-list {
    grid-template-columns: 1fr;
  }
  
  .math-comparison {
    flex-direction: column;
  }
  
  .math-vs {
    padding: 0.5rem 0;
  }
  
  .section-inner {
    padding: 4rem 1.5rem;
  }
  
  .hero-number {
    font-size: clamp(6rem, 30vw, 10rem);
  }
}