:root {
  --kanga-green: #8A9A3B;
  --kanga-green-dark: #6E9A3C;
  --kanga-orange: #E07A3E;
  --kanga-blue: #3D7A82;
  --kanga-streak: #E89B33;
  --kanga-xp: #ECB33D;
  --kanga-surface: #FFFDF8;
  --kanga-surface-alt: #FBF4E3;
  --kanga-border: #E3D8BD;
  --kanga-text: #3F362A;
  --kanga-text-secondary: #8C8168;
  --radius: 16px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--kanga-surface);
  color: var(--kanga-text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

a { color: inherit; text-decoration: none; }

.wrap {
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Nav */
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--kanga-border);
  background: var(--kanga-surface);
  position: sticky;
  top: 0;
  z-index: 10;
}
.nav-brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 18px; }
.nav-brand img { width: 32px; height: 32px; border-radius: 10px; object-fit: cover; }
.nav-links { display: flex; align-items: center; gap: 20px; font-weight: 600; font-size: 14px; color: var(--kanga-text-secondary); }
.nav-links a:hover { color: var(--kanga-text); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 700;
  font-size: 15px;
  padding: 12px 20px;
  border-radius: 14px;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform .05s ease, opacity .15s ease;
}
.btn:active { transform: scale(0.97); }
.btn-primary { background: var(--kanga-green-dark); color: white; }
.btn-primary:hover { opacity: 0.9; }
.btn-outline { background: transparent; border-color: var(--kanga-border); color: var(--kanga-text); }
.btn-outline:hover { background: var(--kanga-surface-alt); }
.btn-block { width: 100%; }
.btn[disabled] { opacity: 0.5; cursor: default; }

/* Hero */
.hero {
  padding: 64px 0 40px;
  text-align: center;
}
.hero img.mascot { width: 140px; height: 140px; border-radius: 28px; object-fit: cover; margin-bottom: 20px; box-shadow: 0 10px 30px rgba(0,0,0,0.08); }
.hero h1 { font-size: 40px; font-weight: 800; margin: 0 0 12px; line-height: 1.15; }
.hero p.lead { font-size: 18px; color: var(--kanga-text-secondary); max-width: 560px; margin: 0 auto 28px; }
.hero .cta-row { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* Feature grid */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  padding: 40px 0 60px;
}
.feature-card {
  background: var(--kanga-surface-alt);
  border-radius: var(--radius);
  padding: 20px;
}
.feature-card .icon { font-size: 28px; margin-bottom: 10px; }
.feature-card h3 { margin: 0 0 6px; font-size: 16px; }
.feature-card p { margin: 0; color: var(--kanga-text-secondary); font-size: 14px; line-height: 1.5; }

/* Footer */
.site-footer {
  border-top: 1px solid var(--kanga-border);
  padding: 24px 0 40px;
  color: var(--kanga-text-secondary);
  font-size: 13px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}
.site-footer a { font-weight: 600; }
.site-footer a:hover { color: var(--kanga-text); }

/* Policy page */
.policy { padding: 48px 0 80px; max-width: 720px; }
.policy h1 { font-size: 30px; margin-bottom: 4px; }
.policy .updated { color: var(--kanga-text-secondary); font-size: 13px; margin-bottom: 32px; }
.policy h2 { font-size: 19px; margin-top: 32px; }
.policy p, .policy li { color: var(--kanga-text); line-height: 1.6; font-size: 15px; }
.policy ul { padding-left: 20px; }

/* Auth / login card */
.auth-shell {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}
.auth-card {
  width: 100%;
  max-width: 380px;
  background: var(--kanga-surface);
  border: 1px solid var(--kanga-border);
  border-radius: 20px;
  padding: 32px 28px;
  text-align: center;
}
.auth-card img.mascot { width: 84px; height: 84px; border-radius: 20px; object-fit: cover; margin-bottom: 14px; }
.auth-card h1 { font-size: 22px; margin: 0 0 6px; }
.auth-card p.sub { color: var(--kanga-text-secondary); font-size: 14px; margin: 0 0 24px; }
.auth-stack { display: flex; flex-direction: column; gap: 10px; }
.btn-apple { background: #000; color: #fff; }
.btn-google { background: #fff; color: #3F362A; border-color: var(--kanga-border); }
.divider { display: flex; align-items: center; gap: 10px; margin: 18px 0; color: var(--kanga-text-secondary); font-size: 12px; }
.divider::before, .divider::after { content: ""; flex: 1; height: 1px; background: var(--kanga-border); }
.field {
  width: 100%;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid var(--kanga-border);
  font-size: 14px;
  margin-bottom: 10px;
  background: var(--kanga-surface);
  color: var(--kanga-text);
}
.auth-error { color: #B23B3B; font-size: 13px; margin-top: 10px; min-height: 16px; }
.skip-link { display: block; margin-top: 18px; font-size: 13px; color: var(--kanga-text-secondary); font-weight: 600; }
.skip-link:hover { color: var(--kanga-text); }

/* App shell */
.app-shell { min-height: 100vh; display: flex; flex-direction: column; }
.app-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  border-bottom: 1px solid var(--kanga-border);
}
.stat-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 700;
  font-size: 14px;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--kanga-surface-alt);
}
.app-main { flex: 1; display: flex; align-items: flex-start; justify-content: center; padding: 32px 20px; }

/* Path / skill list */
.path-list { width: 100%; max-width: 480px; display: flex; flex-direction: column; gap: 10px; }
.skill-row {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 16px;
  border-radius: 14px;
  border: 2px solid var(--kanga-border);
  background: var(--kanga-surface);
  cursor: pointer;
}
.skill-row.locked { opacity: 0.45; cursor: default; }
.skill-row.complete { border-color: var(--kanga-green-dark); }
.skill-badge {
  width: 40px; height: 40px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  background: var(--kanga-green-dark); color: white; font-weight: 800;
  flex-shrink: 0;
}
.skill-row.locked .skill-badge { background: var(--kanga-text-secondary); }
.skill-meta { flex: 1; }
.skill-meta .title { font-weight: 700; font-size: 15px; }
.skill-meta .sub { font-size: 12px; color: var(--kanga-text-secondary); }
.progress-bar-track { width: 100%; height: 8px; border-radius: 999px; background: var(--kanga-border); overflow: hidden; margin-top: 6px; }
.progress-bar-fill { height: 100%; background: var(--kanga-green-dark); }

/* Lesson */
.lesson-shell { width: 100%; max-width: 560px; }
.lesson-progress { display: flex; gap: 6px; margin-bottom: 24px; }
.lesson-progress .seg { flex: 1; height: 8px; border-radius: 999px; background: var(--kanga-border); }
.lesson-progress .seg.done { background: var(--kanga-green-dark); }
.lesson-progress .seg.current { background: var(--kanga-orange); }
.question-card { background: var(--kanga-surface-alt); border-radius: 20px; padding: 28px 24px; margin-bottom: 20px; }
.question-card .prompt { font-size: 19px; font-weight: 700; line-height: 1.4; }
.question-card .detail { font-size: 14px; color: var(--kanga-text-secondary); margin-top: 8px; }
.choice-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.choice-btn {
  padding: 16px;
  border-radius: 14px;
  border: 2px solid var(--kanga-border);
  background: var(--kanga-surface);
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  text-align: center;
}
.choice-btn:hover { background: var(--kanga-surface-alt); }
.choice-btn.selected { border-color: var(--kanga-blue); }
.choice-btn.correct { border-color: var(--kanga-green-dark); background: rgba(110,154,60,0.12); }
.choice-btn.incorrect { border-color: #B23B3B; background: rgba(178,59,59,0.10); }
.choice-btn[disabled] { cursor: default; }
.lesson-footer { display: flex; justify-content: flex-end; margin-top: 20px; }

/* Summary */
.summary-card { text-align: center; max-width: 420px; margin: 0 auto; }
.summary-stats { display: flex; justify-content: center; gap: 24px; margin: 24px 0; }
.summary-stat .num { font-size: 28px; font-weight: 800; }
.summary-stat .label { font-size: 12px; color: var(--kanga-text-secondary); }

.hidden { display: none !important; }
.center-text { text-align: center; }
.muted { color: var(--kanga-text-secondary); font-size: 13px; }