:root {
  --bg: #FAFAF8;
  --fg: #0F172A;
  --fg-muted: #64748B;
  --accent: #F59E0B;
  --accent-light: #FEF3C7;
  --surface: #FFFFFF;
  --border: #E2E8F0;
  --radius: 12px;
}

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

body {
  font-family: 'DM Sans', sans-serif;
  background: var(--bg);
  color: var(--fg);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 250, 248, 0.88);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: 'Playfair Display', serif;
  font-size: 20px;
  font-weight: 700;
  color: var(--fg);
  text-decoration: none;
}

.header-nav {
  display: flex;
  gap: 32px;
}

.header-nav a {
  font-size: 14px;
  font-weight: 500;
  color: var(--fg-muted);
  text-decoration: none;
  transition: color 0.15s;
}

.header-nav a:hover { color: var(--fg); }

/* Hero */
.hero {
  position: relative;
  overflow: hidden;
  padding: 100px 24px 80px;
  background: var(--bg);
}

.hero-bg-shape {
  position: absolute;
  top: -80px;
  right: -120px;
  width: 560px;
  height: 560px;
  background: radial-gradient(ellipse at center, #FEF3C7 0%, transparent 70%);
  pointer-events: none;
}

.hero-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 80px;
  align-items: center;
}

.hero-eyebrow {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 20px;
}

.hero-headline {
  font-family: 'Playfair Display', serif;
  font-size: clamp(40px, 5.5vw, 72px);
  font-weight: 800;
  line-height: 1.1;
  color: var(--fg);
  margin-bottom: 24px;
}

.hero-lede {
  font-size: 18px;
  color: var(--fg-muted);
  max-width: 520px;
  line-height: 1.65;
}

.hero-stat {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 40px;
  text-align: center;
  box-shadow: 0 4px 24px rgba(0,0,0,0.06);
}

.stat-number {
  display: block;
  font-family: 'Playfair Display', serif;
  font-size: 48px;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 10px;
}

.stat-label {
  font-size: 13px;
  color: var(--fg-muted);
  line-height: 1.5;
}

.hero-bottom {
  max-width: 1100px;
  margin: 60px auto 0;
  padding: 0 24px;
}

.hero-tag-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 6px 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 13px;
  font-weight: 500;
  color: var(--fg-muted);
}

/* Sections */
.section-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

.section-eyebrow {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}

.section-title {
  font-family: 'Playfair Display', serif;
  font-size: clamp(28px, 3.5vw, 44px);
  font-weight: 700;
  line-height: 1.2;
  color: var(--fg);
  margin-bottom: 56px;
}

/* How it works */
.how-it-works {
  padding: 100px 0;
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
}

.step-card {
  padding: 36px 32px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.step-number {
  font-family: 'Playfair Display', serif;
  font-size: 56px;
  font-weight: 800;
  color: var(--accent-light);
  line-height: 1;
  margin-bottom: 24px;
  -webkit-text-stroke: 1.5px #F59E0B;
}

.step-card h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--fg);
}

.step-card p {
  font-size: 15px;
  color: var(--fg-muted);
  line-height: 1.65;
}

/* Subjects */
.subjects-section {
  padding: 100px 0;
  background: var(--bg);
}

.subjects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.subject-card {
  padding: 40px 32px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: box-shadow 0.2s;
}

.subject-card:hover {
  box-shadow: 0 8px 32px rgba(0,0,0,0.07);
}

.subject-icon {
  margin-bottom: 20px;
}

.subject-card h3 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--fg);
}

.subject-card p {
  font-size: 15px;
  color: var(--fg-muted);
  line-height: 1.65;
  margin-bottom: 20px;
}

.subject-details {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.subject-details li {
  font-size: 13px;
  color: var(--fg-muted);
  padding-left: 16px;
  position: relative;
}

.subject-details li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 7px;
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
}

/* Proof */
.proof-section {
  padding: 100px 0;
  background: #0F172A;
}

.proof-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.proof-text .section-eyebrow { color: #F59E0B; }
.proof-text .section-title { color: #FFFFFF; }

.proof-body {
  font-size: 16px;
  color: #94A3B8;
  line-height: 1.7;
  margin-bottom: 20px;
}

.proof-body:last-of-type { margin-bottom: 0; }

.proof-metrics {
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.metric {
  padding: 28px 32px;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius);
}

.metric-value {
  display: block;
  font-family: 'Playfair Display', serif;
  font-size: 40px;
  font-weight: 800;
  color: #F59E0B;
  line-height: 1;
  margin-bottom: 8px;
}

.metric-label {
  font-size: 13px;
  color: #94A3B8;
}

/* Pricing */
.pricing-section {
  padding: 100px 0;
  background: var(--bg);
  border-top: 1px solid var(--border);
}

.pricing-grid {
  display: flex;
  justify-content: center;
  margin-bottom: 32px;
}

.pricing-card {
  background: var(--surface);
  border: 2px solid var(--fg);
  border-radius: var(--radius);
  padding: 48px 52px;
  max-width: 520px;
  width: 100%;
  position: relative;
}

.pricing-badge {
  display: inline-flex;
  align-items: center;
  padding: 5px 12px;
  background: var(--accent);
  border-radius: 100px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: white;
  margin-bottom: 24px;
}

.pricing-price {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 8px;
}

.price-currency {
  font-size: 28px;
  font-weight: 600;
  color: var(--fg-muted);
}

.price-amount {
  font-family: 'Playfair Display', serif;
  font-size: 72px;
  font-weight: 800;
  color: var(--fg);
  line-height: 1;
}

.price-note {
  font-size: 16px;
  color: var(--fg-muted);
  margin-left: 4px;
}

.pricing-tier {
  font-size: 20px;
  font-weight: 600;
  color: var(--fg);
  margin-bottom: 28px;
}

.pricing-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 28px;
}

.pricing-features li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 15px;
  color: var(--fg);
}

.pricing-features svg {
  flex-shrink: 0;
  margin-top: 2px;
}

.pricing-upgrade {
  font-size: 13px;
  color: var(--fg-muted);
  border-top: 1px solid var(--border);
  padding-top: 20px;
}

.pricing-availability {
  text-align: center;
  font-size: 14px;
  color: var(--fg-muted);
}

/* Closing */
.closing-section {
  padding: 100px 0;
  background: var(--accent-light);
  border-top: 1px solid var(--border);
}

.closing-headline {
  font-family: 'Playfair Display', serif;
  font-size: clamp(28px, 3.5vw, 48px);
  font-weight: 800;
  line-height: 1.2;
  color: var(--fg);
  margin-bottom: 28px;
}

.closing-body {
  font-size: 18px;
  color: var(--fg-muted);
  max-width: 680px;
  line-height: 1.7;
}

/* Footer */
.site-footer {
  padding: 56px 0;
  background: var(--fg);
  color: #94A3B8;
}

.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  text-align: center;
}

.footer-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: 'Playfair Display', serif;
  font-size: 18px;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 12px;
}

.footer-tagline {
  font-size: 14px;
  margin-bottom: 20px;
}

.footer-legal {
  font-size: 12px;
  color: #475569;
}

/* Responsive */
@media (max-width: 768px) {
  .header-nav { display: none; }

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

  .hero-stat {
    display: none;
  }

  .steps-grid,
  .subjects-grid {
    grid-template-columns: 1fr;
  }

  .proof-layout {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .proof-metrics {
    gap: 16px;
  }

  .pricing-card {
    padding: 36px 28px;
  }
}