:root {
  --bg: #0a0a0c;
  --bg-elevated: #111116;
  --bg-card: #16161c;
  --fg: #e8e6e3;
  --fg-muted: #8a8a95;
  --accent: #c8ff00;
  --accent-dim: rgba(200, 255, 0, 0.12);
  --border: rgba(255, 255, 255, 0.06);
  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'DM Sans', sans-serif;
  --max-width: 1140px;
}

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

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

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

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

/* ── Hero ── */
.hero {
  min-height: 90vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 6rem 2rem 4rem;
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(ellipse 60% 50% at 50% 0%, rgba(200, 255, 0, 0.06) 0%, transparent 70%),
    var(--bg);
}

.hero-inner {
  max-width: var(--max-width);
  width: 100%;
}

.hero-badge {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-dim);
  border: 1px solid rgba(200, 255, 0, 0.2);
  padding: 0.4rem 1rem;
  border-radius: 100px;
  margin-bottom: 2rem;
}

.hero h1 {
  font-size: clamp(2.8rem, 7vw, 5.5rem);
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
}

.lede {
  font-size: 1.2rem;
  color: var(--fg-muted);
  max-width: 620px;
  line-height: 1.7;
  margin-bottom: 3.5rem;
}

.hero-stats {
  display: flex;
  align-items: center;
  gap: 2rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

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

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

.stat-divider {
  width: 1px;
  height: 40px;
  background: var(--border);
}

/* ── Problem ── */
.problem {
  padding: 6rem 2rem;
  background: var(--bg-elevated);
}

.problem-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.problem-left h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  margin-bottom: 1.2rem;
}

.problem-left p {
  color: var(--fg-muted);
  font-size: 1.05rem;
  line-height: 1.7;
}

.path-visual {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.path-step {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  padding: 1.4rem 1.6rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
}

.step-num {
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent);
  background: var(--accent-dim);
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  flex-shrink: 0;
}

.step-text {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
}

.path-arrow {
  width: 2px;
  height: 24px;
  background: var(--accent);
  margin-left: 2.4rem;
  opacity: 0.4;
}

/* ── Features ── */
.features {
  padding: 6rem 2rem;
}

.features-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.section-header {
  margin-bottom: 3.5rem;
}

.section-header h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  margin-bottom: 0.8rem;
}

.section-sub {
  font-size: 1.1rem;
  color: var(--fg-muted);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.2rem;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2rem;
  transition: border-color 0.3s;
}

.feature-card:hover {
  border-color: rgba(200, 255, 0, 0.2);
}

.feature-large {
  grid-column: 1 / -1;
  background:
    radial-gradient(ellipse 40% 60% at 100% 100%, rgba(200, 255, 0, 0.04) 0%, transparent 70%),
    var(--bg-card);
}

.feature-icon {
  font-size: 1.4rem;
  color: var(--accent);
  margin-bottom: 1rem;
}

.feature-card h3 {
  font-size: 1.2rem;
  margin-bottom: 0.6rem;
}

.feature-card p {
  font-size: 0.95rem;
  color: var(--fg-muted);
  line-height: 1.65;
}

/* ── Models ── */
.models {
  padding: 6rem 2rem;
  background: var(--bg-elevated);
}

.models-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.model-list {
  margin-top: 3rem;
}

.model-item {
  display: flex;
  gap: 2rem;
  padding: 2rem 0;
  border-bottom: 1px solid var(--border);
}

.model-item:first-child {
  border-top: 1px solid var(--border);
}

.model-number {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent);
  opacity: 0.6;
  padding-top: 0.2rem;
  flex-shrink: 0;
  width: 30px;
}

.model-content h3 {
  font-size: 1.15rem;
  margin-bottom: 0.5rem;
}

.model-content p {
  font-size: 0.95rem;
  color: var(--fg-muted);
  line-height: 1.65;
}

/* ── Closing ── */
.closing {
  padding: 8rem 2rem;
  text-align: center;
  background:
    radial-gradient(ellipse 50% 50% at 50% 100%, rgba(200, 255, 0, 0.05) 0%, transparent 70%),
    var(--bg);
}

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

.closing h2 {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  margin-bottom: 1.5rem;
}

.closing-sub {
  font-size: 1.15rem;
  color: var(--fg-muted);
  line-height: 1.7;
}

/* ── Footer ── */
.site-footer {
  padding: 3rem 2rem;
  border-top: 1px solid var(--border);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
}

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

/* ── CTA Buttons ── */
.hero-actions {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  margin-bottom: 3rem;
}

.btn-cta {
  display: inline-block;
  background: var(--accent);
  color: #0a0a0c;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  padding: 0.85rem 2rem;
  border-radius: 100px;
  text-decoration: none;
  transition: opacity 0.2s, transform 0.2s;
}

.btn-cta:hover { opacity: 0.88; transform: translateY(-1px); }

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

.cta-group {
  margin-top: 2.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}

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

/* ── Responsive ── */
@media (max-width: 768px) {
  .hero { min-height: auto; padding: 4rem 1.5rem 3rem; }
  .hero-stats { flex-direction: column; align-items: flex-start; gap: 1.2rem; }
  .stat-divider { width: 40px; height: 1px; }
  .problem-inner { grid-template-columns: 1fr; gap: 2.5rem; }
  .feature-grid { grid-template-columns: 1fr; }
  .feature-large { grid-column: auto; }
  .model-item { flex-direction: column; gap: 0.8rem; }
  .footer-inner { flex-direction: column; gap: 0.5rem; text-align: center; }
  .closing { padding: 5rem 1.5rem; }
}