:root {
  --bg: #FAF7F2;
  --fg: #1A1A1A;
  --muted: #6B6B6B;
  --teal: #0F4C5C;
  --teal-light: #1A7A94;
  --amber: #F4A261;
  --amber-dark: #E07B3A;
  --sage: #C8D5B9;
  --white: #FFFFFF;
  --off-white: #F5F1EB;
  --border: rgba(15,76,92,0.12);
  --card-shadow: 0 2px 16px rgba(15,76,92,0.08);
  --font-display: 'Fraunces', Georgia, serif;
  --font-body: 'DM Sans', system-ui, sans-serif;
}

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

html { scroll-behavior: smooth; }

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

/* ─── NAV ─── */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250,247,242,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 18px 32px;
  display: flex;
  align-items: center;
  gap: 16px;
}

.nav-logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--teal);
  letter-spacing: -0.02em;
}

.nav-tagline {
  font-size: 0.8rem;
  color: var(--muted);
  font-weight: 400;
  padding-left: 12px;
  border-left: 1px solid var(--border);
}

/* ─── HERO ─── */
.hero {
  padding: 80px 32px 64px;
}

.hero-inner {
  max-width: 1120px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(15,76,92,0.07);
  color: var(--teal);
  font-size: 0.78rem;
  font-weight: 500;
  padding: 6px 14px;
  border-radius: 100px;
  margin-bottom: 32px;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.badge-dot {
  width: 7px;
  height: 7px;
  background: var(--teal);
  border-radius: 50%;
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero-headline {
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 6vw, 4.5rem);
  font-weight: 600;
  line-height: 1.08;
  color: var(--fg);
  letter-spacing: -0.03em;
  margin-bottom: 28px;
  max-width: 700px;
}

.hero-headline em {
  font-style: italic;
  color: var(--teal);
}

.hero-lede {
  font-size: 1.15rem;
  color: var(--muted);
  max-width: 540px;
  line-height: 1.7;
  margin-bottom: 48px;
  font-weight: 400;
}

.hero-stats {
  display: flex;
  align-items: center;
  gap: 0;
  margin-bottom: 56px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--card-shadow);
}

.stat {
  flex: 1;
  padding: 24px 28px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat-divider {
  width: 1px;
  height: 60px;
  background: var(--border);
  flex-shrink: 0;
}

.stat-number {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  color: var(--teal);
  line-height: 1;
}

.stat-label {
  font-size: 0.72rem;
  color: var(--muted);
  font-weight: 400;
  line-height: 1.4;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.hero-visual {
  margin-top: 8px;
}

.subject-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.chip {
  display: inline-block;
  padding: 8px 18px;
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 500;
  border: 1.5px solid transparent;
  transition: all 0.2s;
  cursor: default;
}

.chip-math { background: rgba(15,76,92,0.08); color: var(--teal); border-color: rgba(15,76,92,0.2); }
.chip-science { background: rgba(100,160,80,0.1); color: #3A7D44; border-color: rgba(100,160,80,0.25); }
.chip-english { background: rgba(200,80,60,0.08); color: #8B2500; border-color: rgba(200,80,60,0.2); }
.chip-test { background: rgba(244,162,97,0.15); color: #B8600A; border-color: rgba(244,162,97,0.35); }
.chip-study { background: rgba(100,80,160,0.08); color: #5C3D8B; border-color: rgba(100,80,160,0.2); }

/* ─── SECTIONS ─── */
.section-label {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--amber);
  margin-bottom: 16px;
}

.section-headline {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 600;
  line-height: 1.18;
  color: var(--fg);
  letter-spacing: -0.02em;
  margin-bottom: 48px;
  max-width: 600px;
}

/* ─── SUBJECTS ─── */
.subjects {
  padding: 80px 32px;
  background: var(--off-white);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.subjects-inner {
  max-width: 1120px;
  margin: 0 auto;
}

.subject-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
}

.subject-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px 20px;
  box-shadow: var(--card-shadow);
  transition: transform 0.2s, box-shadow 0.2s;
}

.subject-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 32px rgba(15,76,92,0.12);
}

.subject-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.subject-icon-math { background: rgba(15,76,92,0.1); color: var(--teal); }
.subject-icon-science { background: rgba(100,160,80,0.12); color: #3A7D44; }
.subject-icon-english { background: rgba(200,80,60,0.1); color: #8B2500; }
.subject-icon-test { background: rgba(244,162,97,0.15); color: #B8600A; }
.subject-icon-study { background: rgba(100,80,160,0.1); color: #5C3D8B; }

.subject-card h3 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--fg);
  margin-bottom: 8px;
}

.subject-card p {
  font-size: 0.8rem;
  color: var(--muted);
  line-height: 1.55;
}

/* ─── DIFFERENCE ─── */
.difference {
  padding: 80px 32px;
}

.difference-inner {
  max-width: 1120px;
  margin: 0 auto;
}

.difference-sub {
  font-size: 1.05rem;
  color: var(--muted);
  max-width: 560px;
  line-height: 1.7;
  margin-bottom: 48px;
}

.diff-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.diff-item {
  padding: 28px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--card-shadow);
}

.diff-number {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--amber);
  letter-spacing: 0.05em;
  margin-bottom: 12px;
}

.diff-item h4 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--fg);
  margin-bottom: 8px;
}

.diff-item p {
  font-size: 0.875rem;
  color: var(--muted);
  line-height: 1.65;
}

/* ─── PRICING ─── */
.pricing {
  padding: 80px 32px;
  background: var(--teal);
}

.pricing .section-label { color: rgba(244,162,97,0.9); }
.pricing .section-headline { color: var(--white); }

.pricing-inner {
  max-width: 1120px;
  margin: 0 auto;
}

.pricing-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 0;
}

.pricing-card {
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 20px;
  padding: 32px;
  color: var(--white);
}

.pricing-card-featured {
  background: rgba(255,255,255,0.13);
  border-color: rgba(244,162,97,0.5);
}

.pricing-tier {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: rgba(255,255,255,0.6);
  display: block;
  margin-bottom: 12px;
}

.pricing-price {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 12px;
}

.price-amount {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 700;
  color: var(--white);
  line-height: 1;
}

.price-unit {
  font-size: 1rem;
  color: rgba(255,255,255,0.6);
}

.pricing-desc {
  font-size: 0.875rem;
  color: rgba(255,255,255,0.65);
  line-height: 1.65;
  margin-bottom: 28px;
}

.pricing-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.pricing-features li {
  font-size: 0.875rem;
  color: rgba(255,255,255,0.85);
  display: flex;
  align-items: flex-start;
  gap: 10px;
  line-height: 1.5;
}

.pricing-cta-box {
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px solid rgba(244,162,97,0.3);
}

.cta-sub {
  font-size: 0.8rem;
  color: var(--amber);
  font-style: italic;
}

/* ─── CLOSING ─── */
.closing {
  padding: 96px 32px;
  background: var(--bg);
  border-top: 1px solid var(--border);
}

.closing-inner {
  max-width: 1120px;
  margin: 0 auto;
}

.closing-content {
  max-width: 680px;
}

.closing h2 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 600;
  line-height: 1.15;
  color: var(--fg);
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}

.closing p {
  font-size: 1.1rem;
  color: var(--muted);
  line-height: 1.7;
  margin-bottom: 40px;
  max-width: 520px;
}

.closing-callout {
  display: inline-block;
  background: rgba(15,76,92,0.07);
  border: 1px solid rgba(15,76,92,0.2);
  border-radius: 12px;
  padding: 20px 28px;
}

.callout-line {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1rem;
  font-weight: 500;
  color: var(--teal);
}

.callout-dot {
  width: 10px;
  height: 10px;
  background: var(--amber);
  border-radius: 50%;
  flex-shrink: 0;
}

/* ─── FOOTER ─── */
.footer {
  padding: 32px;
  border-top: 1px solid var(--border);
}

.footer-inner {
  max-width: 1120px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.footer-logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  color: var(--teal);
  display: block;
  margin-bottom: 4px;
}

.footer-desc {
  font-size: 0.78rem;
  color: var(--muted);
}

.footer-meta {
  font-size: 0.78rem;
  color: var(--muted);
}

/* ─── RESPONSIVE ─── */
@media (max-width: 900px) {
  .hero-stats { flex-direction: column; align-items: flex-start; }
  .stat-divider { width: 100%; height: 1px; }
  .subject-grid { grid-template-columns: repeat(2, 1fr); }
  .diff-grid { grid-template-columns: 1fr; }
  .pricing-grid { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
  .nav-tagline { display: none; }
}

@media (max-width: 600px) {
  .hero { padding: 56px 20px 48px; }
  .subjects, .difference, .pricing, .closing, .footer { padding: 56px 20px; }
  .subjects-inner, .difference-inner, .pricing-inner, .closing-inner { max-width: 100%; }
  .hero-headline { font-size: 2.4rem; }
  .section-headline { font-size: 1.7rem; }
  .subject-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .pricing-card { padding: 24px 20px; }
  .price-amount { font-size: 2.4rem; }
  .stat { padding: 16px 20px; }
  .stat-number { font-size: 1.6rem; }
  .nav-inner { padding: 14px 20px; }
}