:root {
  --bg: #faf8f5;
  --bg-dark: #1a1a2e;
  --bg-warm: #f5f0ea;
  --bg-card: #ffffff;
  --fg: #1a1a2e;
  --fg-light: #5a5a72;
  --fg-muted: #8a8a9a;
  --accent: #c47d2e;
  --accent-light: #e8a838;
  --accent-bg: #fdf6ec;
  --border: #e8e4de;
  --radius: 12px;
  --font-display: 'Plus Jakarta Sans', 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: 1.65;
  -webkit-font-smoothing: antialiased;
}

/* --- NAV --- */
.nav {
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
}
.logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--bg-dark);
  color: var(--accent-light);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  border-radius: 8px;
}
.logo-text {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  color: var(--fg);
}
.nav-tag {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 14px;
  color: var(--accent);
  background: var(--accent-bg);
  padding: 6px 14px;
  border-radius: 20px;
}

/* --- HERO --- */
.hero {
  padding: 100px 0 80px;
  background: var(--bg);
}
.hero-inner {
  max-width: 820px;
  margin: 0 auto;
  padding: 0 32px;
}
.hero-eyebrow {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 24px;
}
.hero-headline {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(36px, 5.5vw, 56px);
  line-height: 1.12;
  color: var(--fg);
  margin-bottom: 28px;
  letter-spacing: -0.025em;
}
.hero-sub {
  font-size: 19px;
  line-height: 1.7;
  color: var(--fg-light);
  max-width: 640px;
  margin-bottom: 48px;
}
.hero-proof {
  display: flex;
  align-items: center;
  gap: 32px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
}
.proof-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.proof-number {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 28px;
  color: var(--fg);
}
.proof-label {
  font-size: 14px;
  color: var(--fg-muted);
}
.proof-divider {
  width: 1px;
  height: 40px;
  background: var(--border);
}

/* --- PROBLEM --- */
.problem {
  padding: 100px 0;
  background: var(--bg-dark);
  color: #ffffff;
}
.problem-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 32px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
}
.problem .section-label {
  color: var(--accent-light);
}
.problem-statement {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 3vw, 32px);
  line-height: 1.3;
  color: #ffffff;
  margin-top: 16px;
}
.problem-card {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius);
  padding: 36px;
}
.problem-detail {
  color: rgba(255,255,255,0.72);
  font-size: 16px;
  margin-bottom: 16px;
  line-height: 1.7;
}
.problem-detail:last-of-type {
  margin-bottom: 20px;
}
.problem-quote {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 18px;
  color: var(--accent-light);
  padding-left: 20px;
  border-left: 3px solid var(--accent-light);
  line-height: 1.5;
}

/* --- SECTION LABEL --- */
.section-label {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
}

/* --- PILLARS --- */
.pillars {
  padding: 100px 0;
  background: var(--bg);
}
.pillars-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 32px;
}
.pillars-headline {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 3vw, 32px);
  line-height: 1.3;
  color: var(--fg);
  margin-top: 16px;
  margin-bottom: 56px;
  max-width: 600px;
}
.pillars-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.pillar {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px;
  transition: border-color 0.2s;
}
.pillar:hover {
  border-color: var(--accent);
}
.pillar-icon {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 14px;
  color: var(--accent);
  margin-bottom: 16px;
}
.pillar-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 22px;
  color: var(--fg);
  margin-bottom: 12px;
}
.pillar-desc {
  color: var(--fg-light);
  font-size: 15px;
  line-height: 1.7;
}

/* --- HOW --- */
.how {
  padding: 100px 0;
  background: var(--bg-warm);
}
.how-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 32px;
}
.how-headline {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 3vw, 32px);
  line-height: 1.3;
  color: var(--fg);
  margin-top: 16px;
  margin-bottom: 56px;
  max-width: 560px;
}
.how-layers {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.layer {
  position: relative;
}
.layer-num {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}
.layer-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  color: var(--fg);
  margin-bottom: 12px;
}
.layer-desc {
  color: var(--fg-light);
  font-size: 15px;
  line-height: 1.7;
}

/* --- LEVELS --- */
.levels {
  padding: 100px 0;
  background: var(--bg);
}
.levels-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 32px;
}
.levels-headline {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 3vw, 32px);
  line-height: 1.3;
  color: var(--fg);
  margin-top: 16px;
  margin-bottom: 56px;
  max-width: 560px;
}
.levels-track {
  display: flex;
  align-items: stretch;
  gap: 16px;
}
.level {
  flex: 1;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
}
.level-badge {
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 5px 12px;
  border-radius: 6px;
  margin-bottom: 16px;
}
.level-badge.beginner {
  background: #e8f5e9;
  color: #2e7d32;
}
.level-badge.capable {
  background: var(--accent-bg);
  color: var(--accent);
}
.level-badge.advanced {
  background: #e8eaf6;
  color: #3949ab;
}
.level-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 22px;
  color: var(--fg);
  margin-bottom: 16px;
}
.level-skills {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.level-skills li {
  font-size: 15px;
  color: var(--fg-light);
  padding-left: 20px;
  position: relative;
  line-height: 1.5;
}
.level-skills li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--border);
}
.level-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  min-width: 24px;
  position: relative;
}
.level-arrow::before {
  content: '';
  width: 24px;
  height: 2px;
  background: var(--border);
}
.level-arrow::after {
  content: '';
  position: absolute;
  right: 0;
  width: 8px;
  height: 8px;
  border-right: 2px solid var(--fg-muted);
  border-bottom: 2px solid var(--fg-muted);
  transform: rotate(-45deg);
}

/* --- CLOSING --- */
.closing {
  padding: 100px 0;
  background: var(--bg-dark);
  color: #ffffff;
  text-align: center;
}
.closing-inner {
  max-width: 780px;
  margin: 0 auto;
  padding: 0 32px;
}
.closing-headline {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1.2;
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}
.closing-sub {
  font-size: 18px;
  color: rgba(255,255,255,0.72);
  line-height: 1.7;
  margin-bottom: 48px;
}
.closing-categories {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
}
.cat-tag {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 14px;
  color: rgba(255,255,255,0.85);
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.12);
  padding: 8px 18px;
  border-radius: 24px;
  transition: background 0.2s;
}
.cat-tag:hover {
  background: rgba(255,255,255,0.14);
}

/* --- FOOTER --- */
.footer {
  padding: 32px 0;
  background: var(--bg);
  border-top: 1px solid var(--border);
}
.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.footer-left {
  display: flex;
  align-items: center;
  gap: 10px;
}
.footer-left .logo-mark {
  width: 28px;
  height: 28px;
  font-size: 14px;
}
.footer-left .logo-text {
  font-size: 16px;
}
.footer-text {
  font-size: 14px;
  color: var(--fg-muted);
}

/* --- RESPONSIVE --- */
@media (max-width: 768px) {
  .problem-inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .pillars-grid {
    grid-template-columns: 1fr;
  }
  .how-layers {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .levels-track {
    flex-direction: column;
  }
  .level-arrow {
    width: 100%;
    height: 24px;
    min-width: unset;
  }
  .level-arrow::before {
    width: 2px;
    height: 24px;
  }
  .level-arrow::after {
    right: unset;
    bottom: 0;
    transform: rotate(45deg);
  }
  .hero-proof {
    flex-direction: column;
    align-items: flex-start;
    gap: 20px;
  }
  .proof-divider {
    width: 40px;
    height: 1px;
  }
  .hero {
    padding: 60px 0;
  }
  .problem, .pillars, .how, .levels, .closing {
    padding: 64px 0;
  }
  .footer-inner {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
}

@media (max-width: 480px) {
  body { font-size: 16px; }
  .nav-inner, .hero-inner, .problem-inner, .pillars-inner, .how-inner, .levels-inner, .closing-inner, .footer-inner {
    padding: 0 20px;
  }
}