/* ---------- design tokens ---------- */
:root {
  --bg: #fbf8ff;
  --bg-soft: #f1ecfa;
  --surface: #ffffff;
  --text: #2d2348;
  --text-dim: #6b6385;
  --text-strong: #1a1135;
  --radius: 20px;
  --radius-lg: 28px;
  --shadow-card: 0 6px 20px -10px rgba(60, 40, 100, 0.25);
  --shadow-lift: 0 24px 48px -20px rgba(60, 40, 100, 0.45);
  --content-max: 1200px;
  --pad-page: clamp(20px, 4vw, 48px);
}

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "Nunito", system-ui, -apple-system, sans-serif;
  color: var(--text);
  background:
    radial-gradient(ellipse 70% 40% at 80% 0%, rgba(168, 85, 247, 0.10), transparent 60%),
    radial-gradient(ellipse 60% 40% at 15% 25%, rgba(6, 182, 212, 0.08), transparent 60%),
    radial-gradient(ellipse 50% 40% at 50% 80%, rgba(236, 72, 153, 0.07), transparent 60%),
    var(--bg);
  background-attachment: fixed;
  min-height: 100vh;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }

/* ---------- header ---------- */
.site-header {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: clamp(24px, 5vw, 48px) var(--pad-page) 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 8px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
}
.brand-mark {
  width: 52px;
  height: 52px;
  display: inline-grid;
  place-items: center;
  font-family: "Fredoka", system-ui, sans-serif;
  font-weight: 700;
  font-size: 30px;
  color: #fff;
  background: linear-gradient(135deg, #a855f7, #ec4899);
  border-radius: 16px;
  box-shadow: 0 10px 24px -8px rgba(168, 85, 247, 0.5);
}
.brand-name {
  font-family: "Fredoka", system-ui, sans-serif;
  font-weight: 600;
  font-size: clamp(20px, 3vw, 26px);
  color: var(--text-strong);
  letter-spacing: 0.3px;
}
.brand-tagline {
  font-size: 14px;
  color: var(--text-dim);
  letter-spacing: 0.5px;
}

/* ---------- top bar / back link ---------- */
.topbar {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: clamp(16px, 3vw, 28px) var(--pad-page) 0;
}
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 14px;
  color: var(--text-dim);
  padding: 8px 16px;
  background: var(--surface);
  border-radius: 999px;
  box-shadow: var(--shadow-card);
  transition: transform 0.2s ease, color 0.2s ease;
}
.back-link:hover,
.back-link:focus-visible {
  transform: translateX(-3px);
  color: var(--text-strong);
  outline: none;
}

/* ---------- hero ---------- */
.hero {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: clamp(40px, 7vw, 80px) var(--pad-page) clamp(24px, 4vw, 40px);
  text-align: center;
}
.hero-eyebrow {
  font-family: "Fredoka", system-ui, sans-serif;
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: #a855f7;
  margin-bottom: 14px;
}
.hero h1 {
  font-family: "Fredoka", system-ui, sans-serif;
  font-weight: 700;
  font-size: clamp(40px, 7vw, 72px);
  line-height: 1.05;
  background: linear-gradient(135deg, #7c3aed 0%, #ec4899 60%, #f59e0b 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: var(--text-strong);
  letter-spacing: -0.5px;
  margin-bottom: 18px;
}
.hero-sub {
  font-size: clamp(16px, 2vw, 19px);
  color: var(--text-dim);
  max-width: 540px;
  margin: 0 auto;
}

/* ---------- topic grid ---------- */
.topics {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 var(--pad-page) clamp(48px, 6vw, 80px);
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: clamp(16px, 2.5vw, 28px);
}

.topic-card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 28px 26px 24px;
  color: #ffffff;
  background: linear-gradient(140deg, var(--accent) 0%, var(--accent-dark) 100%);
  border-radius: var(--radius-lg);
  overflow: hidden;
  isolation: isolate;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  min-height: 240px;
  cursor: pointer;
  box-shadow: var(--shadow-card);
}
.topic-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 85% -15%, rgba(255, 255, 255, 0.35) 0%, transparent 55%);
  opacity: 0.8;
  transition: opacity 0.25s ease;
  z-index: -1;
}
.topic-card:hover,
.topic-card:focus-visible {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lift), 0 0 0 4px color-mix(in srgb, var(--accent) 35%, transparent);
  outline: none;
}
.topic-card:hover::before,
.topic-card:focus-visible::before {
  opacity: 1;
}

.topic-icon {
  width: 60px;
  height: 60px;
  display: grid;
  place-items: center;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.22);
  backdrop-filter: blur(4px);
  margin-bottom: 18px;
  color: #ffffff;
}
.topic-icon svg {
  width: 38px;
  height: 38px;
}

/* refined illustration cards: larger crafted line-art, no frosted tile */
.topic-art {
  width: 100%;
  height: 118px;
  margin: 2px 0 20px;
  color: #ffffff;
  filter: drop-shadow(0 5px 12px rgba(0, 0, 0, 0.14));
}
.topic-art svg {
  width: 100%;
  height: 100%;
}

.topic-title {
  font-family: "Fredoka", system-ui, sans-serif;
  font-weight: 600;
  font-size: 22px;
  color: #ffffff;
  margin-bottom: 8px;
  letter-spacing: -0.2px;
}
.topic-desc {
  font-size: 15px;
  color: rgba(255, 255, 255, 0.92);
  line-height: 1.5;
  margin-bottom: 20px;
  flex: 1;
}
.topic-cta {
  display: inline-block;
  font-weight: 700;
  font-size: 15px;
  color: #ffffff;
  transition: transform 0.2s ease;
  align-self: flex-start;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.15);
}
.topic-card:hover .topic-cta,
.topic-card:focus-visible .topic-cta {
  transform: translateX(4px);
}

/* ---------- how it works ---------- */
.how-it-works {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 var(--pad-page) clamp(48px, 6vw, 80px);
  text-align: center;
}
.how-it-works h2 {
  font-family: "Fredoka", system-ui, sans-serif;
  font-weight: 600;
  font-size: clamp(24px, 3.5vw, 32px);
  color: var(--text-strong);
  margin-bottom: 16px;
}
.how-it-works p {
  font-size: 17px;
  color: var(--text);
  line-height: 1.65;
}

/* ---------- skills strip ---------- */
.skills {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 var(--pad-page) clamp(48px, 6vw, 80px);
  text-align: center;
}
.skills h2 {
  font-family: "Fredoka", system-ui, sans-serif;
  font-weight: 600;
  font-size: clamp(22px, 3vw, 28px);
  color: var(--text-strong);
  margin-bottom: 22px;
}
.skill-pills {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}
.skill-pill {
  font-weight: 700;
  font-size: 15px;
  color: var(--text-strong);
  padding: 10px 20px;
  background: var(--surface);
  border-radius: 999px;
  box-shadow: var(--shadow-card);
}

/* ---------- footer ---------- */
.site-footer {
  padding: 24px var(--pad-page) 32px;
  text-align: center;
  font-size: 13px;
  color: var(--text-dim);
  opacity: 0.8;
}

/* ---------- lesson pages ---------- */
.lesson {
  max-width: 820px;
  margin: 0 auto;
  padding: 0 var(--pad-page) clamp(40px, 6vw, 72px);
  display: flex;
  flex-direction: column;
  gap: clamp(20px, 3vw, 28px);
}
.lesson-card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: clamp(24px, 4vw, 38px);
}
.lesson-card h2 {
  font-family: "Fredoka", system-ui, sans-serif;
  font-weight: 600;
  font-size: clamp(22px, 3vw, 28px);
  color: var(--text-strong);
  margin-bottom: 14px;
}
.lesson-card h3 {
  font-family: "Fredoka", system-ui, sans-serif;
  font-weight: 600;
  font-size: 19px;
  color: var(--text-strong);
  margin: 4px 0 10px;
}
.lesson-card p { font-size: 17px; line-height: 1.65; margin-bottom: 12px; }
.lesson-card p:last-child { margin-bottom: 0; }

/* hero badges */
.badge-row {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 12px;
  margin-top: 24px;
}
.badge {
  display: inline-flex; align-items: center; gap: 8px;
  font-weight: 700; font-size: 14px; color: var(--text-strong);
  background: var(--surface); padding: 10px 18px; border-radius: 999px;
  box-shadow: var(--shadow-card);
}
.badge svg { width: 17px; height: 17px; }
.badge.download { transition: transform 0.2s ease; }
.badge.download:hover { transform: translateY(-2px); }

/* primary button */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: "Fredoka", system-ui, sans-serif;
  font-weight: 600; font-size: 16px; color: #fff; cursor: pointer;
  border: none; border-radius: 999px; padding: 13px 26px;
  background: linear-gradient(135deg, var(--accent, #22d3ee), var(--accent-dark, #0e7490));
  box-shadow: var(--shadow-card); transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.btn:hover { transform: translateY(-2px); box-shadow: var(--shadow-lift); }
.btn:disabled { opacity: 0.55; cursor: default; transform: none; box-shadow: var(--shadow-card); }

/* activity 1: challenge */
.challenge-q {
  background: var(--bg-soft); border-radius: var(--radius);
  padding: 16px 18px; margin-bottom: 14px;
}
.challenge-q .q { font-weight: 700; color: var(--text-strong); margin-bottom: 6px; }
.challenge-q .prompt-text { color: var(--text-dim); font-size: 15px; }
.challenge-q .reveal { display: none; color: var(--text); font-size: 15px; }
.revealed .challenge-q .reveal { display: block; }
.revealed .challenge-q .prompt-text { display: none; }
.answer-panel { display: none; margin-top: 6px; }
.revealed .answer-panel { display: block; }
.xp-win {
  font-weight: 700; color: #047857;
  background: #ecfdf5; border-radius: var(--radius); padding: 13px 16px;
}

/* question types table */
.table-wrap { overflow-x: auto; margin: 4px 0 18px; }
.qtable { width: 100%; border-collapse: collapse; font-size: 15px; min-width: 520px; }
.qtable th, .qtable td { text-align: left; padding: 12px 14px; border-bottom: 1px solid var(--bg-soft); }
.qtable th { font-family: "Fredoka", sans-serif; font-weight: 600; color: var(--text-strong); background: var(--bg-soft); }
.qtable tr:last-child td { border-bottom: none; }
.qtable .cat { font-weight: 700; color: var(--accent-dark, #0e7490); white-space: nowrap; }

/* practice survey */
.survey-q { margin-bottom: 22px; }
.survey-q > p { font-weight: 700; color: var(--text-strong); margin-bottom: 10px; }
.opt {
  display: flex; align-items: center; gap: 12px;
  padding: 11px 16px; margin-bottom: 8px;
  background: var(--bg-soft); border-radius: 14px; cursor: pointer;
  border: 2px solid transparent; transition: border-color 0.15s ease;
}
.opt:hover { border-color: color-mix(in srgb, var(--accent, #22d3ee) 55%, transparent); }
.opt input { accent-color: var(--accent-dark, #0e7490); width: 18px; height: 18px; flex: none; }
.survey-done { display: none; margin-top: 14px; font-weight: 700; color: #047857; background: #ecfdf5; padding: 13px 16px; border-radius: var(--radius); }

/* golden rule */
.goldenrule {
  background: linear-gradient(135deg, #1e3c72, #2a5298);
  color: #fff; border-radius: var(--radius-lg);
  padding: clamp(26px, 4vw, 36px); text-align: center;
}
.goldenrule h2 { color: #fff; font-family: "Fredoka", sans-serif; font-weight: 600; font-size: clamp(22px, 3vw, 28px); margin-bottom: 12px; }
.goldenrule p { color: rgba(255, 255, 255, 0.94); font-size: 18px; line-height: 1.6; margin: 0 auto; max-width: 540px; }

/* lesson nav cards */
.lesson-nav { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; margin-top: 4px; }
.lesson-nav a {
  display: flex; flex-direction: column; gap: 6px;
  background: var(--bg-soft); border-radius: var(--radius);
  padding: 20px 22px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.lesson-nav a:hover { transform: translateY(-4px); box-shadow: var(--shadow-card); }
.lesson-nav .t { font-family: "Fredoka", sans-serif; font-weight: 600; font-size: 18px; color: var(--text-strong); }
.lesson-nav .d { font-size: 14px; color: var(--text-dim); }

/* mark complete */
.complete-done { display: none; margin-top: 16px; font-weight: 700; color: #047857; background: #ecfdf5; padding: 13px 16px; border-radius: var(--radius); }
.completed .complete-done { display: block; }
.completed .btn-complete { display: none; }

/* ---------- motion respect ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}

/* ---------- Lesson 2: build-your-own-survey form ---------- */
.build .field { margin-bottom: 16px; }
.build .field > label { display: block; font-weight: 700; color: var(--text-strong); margin-bottom: 7px; font-size: 15px; }
.build input[type="text"], .build input[type="number"], .build textarea {
  width: 100%; font: inherit; color: var(--text);
  background: var(--bg-soft); border: 2px solid transparent; border-radius: 14px;
  padding: 12px 14px; transition: border-color 0.15s ease, background 0.15s ease;
}
.build textarea { min-height: 74px; resize: vertical; line-height: 1.5; }
.build input[type="text"]:focus, .build input[type="number"]:focus, .build textarea:focus {
  outline: none; border-color: color-mix(in srgb, var(--accent, #22d3ee) 60%, transparent); background: #fff;
}
.build input::placeholder, .build textarea::placeholder { color: var(--text-dim); opacity: 0.7; }

/* topic picker chips */
.topic-pick { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 10px; margin-bottom: 14px; }
.chip {
  display: flex; align-items: center; gap: 10px; cursor: pointer;
  padding: 12px 15px; background: var(--bg-soft); border: 2px solid transparent;
  border-radius: 14px; font-weight: 600; color: var(--text-strong);
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.chip:hover { transform: translateY(-2px); border-color: color-mix(in srgb, var(--accent, #22d3ee) 45%, transparent); }
.chip input { accent-color: var(--accent-dark, #0e7490); width: 18px; height: 18px; flex: none; }
.chip:has(input:checked) { border-color: var(--accent, #22d3ee); background: #fff; }

/* build question blocks */
.q-build { background: var(--bg-soft); border-radius: var(--radius); padding: 18px 18px 16px; margin-bottom: 16px; }
.q-build .q-head { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; flex-wrap: wrap; }
.q-num { display: grid; place-items: center; width: 30px; height: 30px; flex: none; border-radius: 9px; font-family: "Fredoka", sans-serif; font-weight: 600; color: #fff; background: linear-gradient(135deg, var(--accent, #22d3ee), var(--accent-dark, #0e7490)); }
.q-type { font-family: "Fredoka", sans-serif; font-weight: 600; color: var(--text-strong); font-size: 17px; }
.q-tip { font-size: 14px; color: var(--accent-dark, #0e7490); font-weight: 700; background: #fff; padding: 8px 12px; border-radius: 12px; margin-top: 10px; }
.q-build .opts-mini { display: grid; gap: 8px; margin-top: 10px; }
.inline-fields { display: flex; flex-wrap: wrap; gap: 12px; }
.inline-fields .field { flex: 1; min-width: 120px; }

/* checkbox option grid (reuses .opt) */
.opt-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 8px; }
.opt-grid .opt { margin-bottom: 0; }

/* live XP tracker */
.xp-track { list-style: none; display: flex; flex-direction: column; gap: 10px; margin: 2px 0 18px; }
.xp-track li { display: flex; align-items: center; gap: 12px; padding: 12px 15px; background: var(--bg-soft); border-radius: 14px; font-weight: 700; color: var(--text-dim); transition: background 0.2s ease, color 0.2s ease; }
.xp-track .tick { display: grid; place-items: center; width: 26px; height: 26px; flex: none; border-radius: 999px; background: #fff; color: var(--text-dim); box-shadow: inset 0 0 0 2px var(--bg-soft); font-size: 15px; font-weight: 700; }
.xp-track .pts { margin-left: auto; font-size: 14px; white-space: nowrap; }
.xp-track li.done { background: #ecfdf5; color: #047857; }
.xp-track li.done .tick { background: #10b981; color: #fff; box-shadow: none; }
.xp-total { font-family: "Fredoka", sans-serif; font-weight: 600; font-size: 20px; color: var(--text-strong); text-align: center; }
.xp-total b { color: var(--accent-dark, #0e7490); }

/* survey preview payoff */
.survey-preview { display: none; margin-top: 16px; }
.survey-preview.show { display: block; }
.survey-preview .sp-card { background: var(--bg-soft); border-radius: var(--radius); padding: 18px 20px; }
.survey-preview h3 { margin: 14px 0 4px; }
.survey-preview h3:first-child { margin-top: 0; }
.survey-preview ol, .survey-preview ul { margin: 4px 0 0 20px; }
.survey-preview li { font-size: 15px; line-height: 1.6; margin-bottom: 4px; }
.sp-empty { color: var(--text-dim); font-style: italic; }

/* ---------- Lesson 3: tally practice & messy data ---------- */
.tally-btns{display:flex;flex-wrap:wrap;gap:10px;margin-top:6px}
.tmarks{font-size:18px;color:var(--text-strong)}
.tmarks .bundle{color:var(--accent-dark,#0e7490);margin-right:8px}
.tmarks .sticks{letter-spacing:3px;font-family:ui-monospace,monospace}
.messy tbody tr{cursor:pointer;transition:background .15s ease}
.messy tbody tr:hover{background:var(--bg-soft)}
.messy tr.hit{background:#ecfdf5}
.messy tr.hit td{color:#047857;font-weight:700}
.messy tr.miss{background:#fdecec}
.hintline{margin-top:12px;font-weight:700;font-size:14px;color:var(--text-dim)}
.quiz-mini .xp-win{margin-top:12px}
.quiz-no{margin-top:12px;font-weight:700;color:#c0392b;background:#fdecec;padding:13px 16px;border-radius:var(--radius)}

/* ---------- Lesson 4: chart builder & graph reading ---------- */
.chart-inputs{display:grid;gap:10px;margin-top:6px}
.chart-row{display:flex;gap:10px}
.chart-row input[type="text"]{flex:2;font:inherit;background:var(--bg-soft);border:2px solid transparent;border-radius:12px;padding:10px 13px}
.chart-row input[type="number"]{flex:1;min-width:90px;font:inherit;background:var(--bg-soft);border:2px solid transparent;border-radius:12px;padding:10px 13px}
.chart-row input:focus{outline:none;border-color:color-mix(in srgb,var(--accent,#22d3ee) 60%,transparent);background:#fff}
.livechart{display:flex;align-items:flex-end;gap:14px;height:220px;margin-top:20px;padding:12px 12px 0;background:var(--bg-soft);border-radius:var(--radius)}
.livechart .col{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:flex-end;height:100%}
.livechart .val{font-weight:800;font-size:14px;color:var(--text-strong)}
.livechart .bar{width:70%;border-radius:8px 8px 0 0;background:linear-gradient(180deg,var(--accent,#22d3ee),var(--accent-dark,#0e7490));transition:height .3s ease;min-height:2px}
.livechart .lbl{font-size:12px;font-weight:700;color:var(--text-dim);padding:8px 2px;text-align:center;word-break:break-word}
.chart-title-in{width:100%;font:inherit;font-weight:700;background:var(--bg-soft);border:2px solid transparent;border-radius:12px;padding:10px 13px;margin-top:6px}
.chart-title-in:focus{outline:none;border-color:color-mix(in srgb,var(--accent,#22d3ee) 60%,transparent);background:#fff}
.readchart{margin:10px 0 4px}

/* ---------- Pattern Hunter: sequence games ---------- */
.seq{display:flex;flex-wrap:wrap;gap:10px;align-items:center;font-size:34px;background:var(--bg-soft);border-radius:var(--radius);padding:16px 18px;margin:8px 0 14px}
.seq .q{color:var(--accent-dark,#6d28d9);font-weight:800;font-family:"Fredoka",sans-serif;font-size:30px}
.choicegrid{display:flex;flex-wrap:wrap;gap:10px}
.choicegrid button{font-size:26px;line-height:1;padding:12px 18px;background:#fff;border:2px solid var(--bg-soft);border-radius:14px;cursor:pointer;transition:transform .15s ease,border-color .15s ease}
.choicegrid button:hover{transform:translateY(-2px);border-color:color-mix(in srgb,var(--accent,#a78bfa) 60%,transparent)}
.choicegrid button.ok{border-color:#10b981;background:#ecfdf5}
.choicegrid button.no{border-color:#ef4444;background:#fdecec;animation:shake .3s}
@keyframes shake{25%{transform:translateX(-4px)}75%{transform:translateX(4px)}}
.numin{font:inherit;font-weight:800;font-size:20px;width:110px;text-align:center;background:#fff;border:2px solid var(--bg-soft);border-radius:12px;padding:10px}
.numin:focus{outline:none;border-color:var(--accent,#a78bfa)}
.numin.ok{border-color:#10b981;background:#ecfdf5}
.numin.no{border-color:#ef4444;background:#fdecec}
.roundtag{display:inline-block;font-weight:800;font-size:12px;letter-spacing:.06em;text-transform:uppercase;color:var(--accent-dark,#6d28d9);background:color-mix(in srgb,var(--accent,#a78bfa) 18%,#fff);border-radius:999px;padding:4px 12px;margin-bottom:8px}
.sortrow{display:flex;flex-wrap:wrap;align-items:center;gap:10px;background:var(--bg-soft);border-radius:14px;padding:12px 14px;margin-bottom:10px}
.sortrow .s{font-weight:800;font-size:19px;flex:1;min-width:190px}
.sortrow .tags{display:flex;gap:8px}
.sortrow .tags button{font:inherit;font-weight:700;font-size:13px;padding:7px 13px;border-radius:999px;border:2px solid transparent;background:#fff;cursor:pointer}
.sortrow .tags button:hover{border-color:color-mix(in srgb,var(--accent,#a78bfa) 55%,transparent)}
.sortrow .tags button.no{border-color:#ef4444;background:#fdecec;color:#b91c1c;animation:shake .35s}
.opt.ok{border-color:#10b981!important;background:#ecfdf5}
.opt.no{border-color:#ef4444!important;background:#fdecec;animation:shake .35s}
.rq-msg{font-weight:800;font-size:14px;margin-top:6px;min-height:18px}
.sortrow.done{outline:2px solid #10b981}
.sortrow.done .tags button{opacity:.45;pointer-events:none}
.sortrow.done .tags button.picked{opacity:1;border-color:#10b981;background:#ecfdf5}
.factsplit{display:grid;grid-template-columns:1fr 1fr;gap:16px}
@media(max-width:640px){.factsplit{grid-template-columns:1fr}}
.factbox{background:var(--bg-soft);border-radius:var(--radius);padding:16px 18px}
.factbox h3{margin-top:0}
.careers{display:flex;flex-wrap:wrap;gap:8px;margin-top:8px}
.careers span{background:#fff;border:1px solid var(--bg-soft);border-radius:999px;padding:6px 13px;font-size:13.5px;font-weight:700}

/* ---------- PH Lesson 2: cafeteria filing game ---------- */
.shoutbox{background:var(--bg-soft);border-radius:var(--radius);padding:22px;text-align:center;margin:10px 0 14px}
.shout{display:inline-block;background:#fff;border:2px solid var(--accent,#a78bfa);border-radius:18px 18px 18px 4px;
  padding:14px 20px;font-weight:800;font-size:19px;box-shadow:var(--shadow-card);max-width:420px}
.shout .who{display:block;font-size:12px;font-weight:700;color:var(--text-dim);letter-spacing:.05em;text-transform:uppercase;margin-bottom:4px}
.buckets{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:10px;margin-top:16px}
.buckets button{font:inherit;font-weight:800;font-size:15px;padding:13px 10px;border-radius:14px;border:2px solid transparent;
  background:#fff;cursor:pointer;transition:transform .15s ease,border-color .15s ease}
.buckets button:hover{transform:translateY(-2px);border-color:color-mix(in srgb,var(--accent,#a78bfa) 55%,transparent)}
.buckets button .ct{display:block;font-size:22px;color:var(--accent-dark,#6d28d9);font-family:"Fredoka",sans-serif}
.buckets button.no{border-color:#ef4444;background:#fdecec;animation:shake .3s}
.filedone{font-weight:800;color:var(--accent-dark,#6d28d9);margin-top:10px}

/* ---------- PH Lesson 3: function machines ---------- */
.machine{background:var(--bg-soft);border-radius:var(--radius);padding:18px;margin-bottom:18px}
.machine .mhead{display:flex;align-items:center;gap:12px;margin-bottom:12px}
.machine .mbot{font-size:34px}
.machine .mname{font-family:"Fredoka",sans-serif;font-weight:600;font-size:19px;color:var(--text-strong)}
.machine .mstate{margin-left:auto;font-weight:800;font-size:12px;letter-spacing:.06em;text-transform:uppercase;color:var(--accent-dark,#6d28d9)}
.machine.solved{outline:2px solid #10b981}
.machine.solved .mstate{color:#047857}
.feedrow{display:flex;flex-wrap:wrap;gap:10px;align-items:center}
.feedrow .btn{padding:11px 20px;font-size:15px}
.iolog{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px;min-height:34px}
.iopair{background:#fff;border:1px solid var(--bg-soft);border-radius:10px;padding:6px 12px;font-weight:800;font-size:15px}
.iopair b{color:var(--accent-dark,#6d28d9)}
.proverow{display:none;margin-top:14px;padding-top:14px;border-top:2px dashed color-mix(in srgb,var(--accent,#a78bfa) 40%,transparent);
  flex-wrap:wrap;gap:10px;align-items:center;font-weight:700}
.proverow.show{display:flex}
.rulecard{background:linear-gradient(135deg,#4c1d95,#7c3aed);color:#fff;border-radius:var(--radius);padding:18px 20px;margin-top:14px;text-align:center}
.rulecard .rc{font-family:"Fredoka",sans-serif;font-size:22px}
.speedtbl{display:flex;gap:8px;flex-wrap:wrap;font-weight:800;font-size:15px;margin:6px 0 10px}
.speedtbl span{background:#fff;border:1px solid var(--bg-soft);border-radius:10px;padding:6px 12px}
.speedtbl span b{color:var(--accent-dark,#6d28d9)}
.mysel{font:inherit;font-weight:700;font-size:16px;padding:10px 14px;border-radius:12px;border:2px solid var(--bg-soft);background:#fff}

/* ---------- PH Lesson 4: masquerade ---------- */
.masqgrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px;margin-top:6px}
.masqcard{font:inherit;background:#fff;border:2px solid var(--bg-soft);border-radius:16px;padding:18px 14px;cursor:pointer;
  text-align:center;transition:transform .15s ease,border-color .15s ease,box-shadow .15s ease}
.masqcard:hover{transform:translateY(-3px);border-color:color-mix(in srgb,var(--accent,#a78bfa) 55%,transparent)}
.masqcard .pat{font-size:22px;font-weight:800;line-height:1.5}
.masqcard .skel{display:none;margin-top:10px;font-family:"Fredoka",sans-serif;font-weight:600;font-size:15px;color:#047857;
  background:#ecfdf5;border-radius:999px;padding:4px 12px}
.masqcard.sel{border-color:var(--accent-dark,#6d28d9);box-shadow:0 0 0 3px color-mix(in srgb,var(--accent,#a78bfa) 30%,transparent)}
.masqcard.matched{border-color:#10b981;cursor:default}
.masqcard.matched .skel{display:inline-block}
.masqcard.no{border-color:#ef4444;animation:shake .3s}
.costume-out{margin-top:16px}
.costume-line{background:var(--bg-soft);border-radius:14px;padding:14px 18px;margin-bottom:10px;font-size:24px;letter-spacing:2px}
.costume-line .theme{display:block;font-size:12px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--text-dim);margin-bottom:4px}
.bigbadge{background:linear-gradient(135deg,#4c1d95,#7c3aed);color:#fff;border-radius:var(--radius-lg);padding:26px;text-align:center;margin-top:14px}
.bigbadge .medal{font-size:52px}
.bigbadge h3{color:#fff;font-family:"Fredoka",sans-serif;font-size:24px;margin:8px 0 4px}
.confetti{position:fixed;top:-40px;font-size:24px;z-index:999;pointer-events:none;animation:fall linear forwards}
@keyframes fall{to{transform:translateY(110vh) rotate(720deg);opacity:.8}}

/* ---------- Math City: building designer ---------- */
.designer{display:grid;grid-template-columns:1fr 220px;gap:18px;margin-top:10px}
@media(max-width:700px){.designer{grid-template-columns:1fr}}
.dctrl{display:grid;gap:14px}
.dctrl label{font-weight:800;font-size:14px;color:var(--text-strong)}
.dctrl input[type="range"]{width:100%;accent-color:var(--accent-dark,#a16207)}
.dctrl .val{font-family:"Fredoka",sans-serif;color:var(--accent-dark,#a16207);font-size:17px}
.dstats{display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:10px;margin-top:14px}
.dstat{background:var(--bg-soft);border-radius:14px;padding:12px 14px;text-align:center}
.dstat .n{font-family:"Fredoka",sans-serif;font-weight:600;font-size:21px;color:var(--text-strong)}
.dstat .l{font-size:11.5px;font-weight:800;letter-spacing:.05em;text-transform:uppercase;color:var(--text-dim)}
.dstat.good .n{color:#047857}
.dstat.bad .n{color:#c0392b}
.towerbox{background:linear-gradient(180deg,#dbeafe 0%,#eef2ff 55%,#d1fae5 90%,#a7f3d0 100%);border-radius:var(--radius);display:flex;align-items:flex-end;justify-content:center;min-height:240px;padding:0 10px}
.towerbox svg{display:block}
.goalbar{background:var(--bg-soft);border-radius:14px;padding:13px 16px;font-weight:700;margin-top:12px}
.goalbar .ok{color:#047857}.goalbar .nope{color:#c0392b}

/* ---------- Math City L2: city builder ---------- */
.catalog{display:grid;gap:10px;margin-top:8px}
.catrow{display:flex;align-items:center;gap:12px;background:var(--bg-soft);border-radius:14px;padding:12px 14px;flex-wrap:wrap}
.catrow .ic{font-size:26px}
.catrow .nm{font-weight:800;min-width:130px}
.catrow .info{font-size:13px;color:var(--text-dim);font-weight:600;flex:1;min-width:150px}
.catrow .qty{display:flex;align-items:center;gap:8px;margin-left:auto}
.catrow .qty button{font:inherit;font-weight:800;font-size:18px;width:36px;height:36px;border-radius:10px;border:2px solid transparent;background:#fff;cursor:pointer}
.catrow .qty button:hover{border-color:color-mix(in srgb,var(--accent,#fbbf24) 60%,transparent)}
.catrow .qty .n{font-family:"Fredoka",sans-serif;font-weight:600;font-size:20px;min-width:28px;text-align:center}
.skyline{background:linear-gradient(180deg,#bfdbfe 0%,#e0f2fe 60%,#bbf7d0 100%);border-radius:var(--radius);margin-top:14px;overflow:hidden}
.skyline svg{display:block;width:100%;height:150px}
.svc-need{font-size:13px;font-weight:700}
.svc-need .ok{color:#047857}.svc-need .short{color:#c0392b}

/* ---------- Probability: flip lab ---------- */
.coinrow{display:flex;flex-wrap:wrap;gap:10px;align-items:center}
.bigcoin{font-size:64px;line-height:1;min-width:76px;text-align:center;transition:transform .3s ease}
.bigcoin.spin{transform:rotateY(360deg) scale(1.15)}
.fliptally{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:14px;max-width:420px}
.fliptally .ft{background:var(--bg-soft);border-radius:14px;padding:12px 16px;text-align:center}
.fliptally .ft .n{font-family:"Fredoka",sans-serif;font-weight:600;font-size:26px}
.fliptally .ft .l{font-size:12px;font-weight:800;letter-spacing:.05em;text-transform:uppercase;color:var(--text-dim)}
.convbar{height:34px;border-radius:10px;overflow:hidden;display:flex;margin-top:14px;background:#fde68a}
.convbar .h{background:#b45309;transition:width .3s ease;display:grid;place-items:center;color:#fff;font-weight:800;font-size:13px;min-width:0;overflow:hidden}
.convbar .t{flex:1;display:grid;place-items:center;color:#78350f;font-weight:800;font-size:13px}
.fiftyline{text-align:center;font-weight:800;font-size:13px;color:var(--text-dim);margin-top:4px}

/* ---------- Probability L3: Pascal's triangle ---------- */
.pascal{display:flex;flex-direction:column;align-items:center;gap:8px;margin-top:12px}
.prow{display:flex;gap:8px;justify-content:center}
.pcell{width:52px;height:44px;display:grid;place-items:center;background:#fff;border:2px solid var(--bg-soft);
  border-radius:12px;font-family:"Fredoka",sans-serif;font-weight:600;font-size:17px;color:var(--text-strong)}
.pcell.given{background:var(--bg-soft)}
.pcell input{width:100%;height:100%;border:none;background:transparent;text-align:center;font:inherit;border-radius:10px}
.pcell input:focus{outline:2px solid var(--accent,#fb923c)}
.pcell.ok{border-color:#10b981;background:#ecfdf5}
.pcell.no{border-color:#ef4444;animation:shake .3s}
.prow .rowsum{margin-left:14px;align-self:center;font-weight:800;font-size:13px;color:var(--text-dim);min-width:70px}
.headmap{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-top:10px}
.headmap .hm{background:var(--bg-soft);border-radius:12px;padding:10px 14px;text-align:center;font-weight:800}
.headmap .hm .big{font-family:"Fredoka",sans-serif;font-size:22px;color:var(--accent-dark,#b45309)}
.headmap .hm .lab{font-size:11.5px;color:var(--text-dim);text-transform:uppercase;letter-spacing:.04em}
@media(max-width:560px){.pcell{width:40px;height:38px;font-size:14px}}

/* ---------- Greek Mythology ---------- */
.gm-prose{max-width:820px}
.gm-prose h2{font-family:"Fredoka",sans-serif;color:var(--text-strong);margin:1.4em 0 .4em}
.gm-prose h3{font-family:"Fredoka",sans-serif;color:var(--accent-dark,#a16207);margin:1.2em 0 .3em}
.gm-prose p,.gm-prose li{font-size:16px;line-height:1.7}
.gm-prose ul,.gm-prose ol{padding-left:22px}
.gm-prose table{width:100%;border-collapse:collapse;font-size:14.5px;margin:12px 0}
.gm-prose th,.gm-prose td{text-align:left;padding:8px 10px;border-bottom:1px solid var(--bg-soft)}
.gm-prose th{background:var(--bg-soft);font-weight:800}
.gm-prose img{max-width:100%;height:auto;border-radius:12px}
.godgrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:12px;margin-top:10px}
.godcard{background:#fff;border:2px solid var(--bg-soft);border-radius:16px;padding:14px 12px;text-align:center;cursor:pointer;
  transition:transform .15s ease,border-color .15s ease}
.godcard:hover{transform:translateY(-3px);border-color:color-mix(in srgb,var(--accent,#fbbf24) 60%,transparent)}
.godcard .gi{font-size:34px}
.godcard .gn{font-family:"Fredoka",sans-serif;font-weight:600;font-size:17px;margin-top:4px}
.godcard .gd{display:none;font-size:13px;color:var(--text-dim);margin-top:8px;line-height:1.5}
.godcard.open{border-color:var(--accent-dark,#a16207)}
.godcard.open .gd{display:block}

/* ---------- god trading cards ---------- */
.deck{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}
.deck button{font:inherit;font-weight:800;font-size:14px;padding:9px 14px;border-radius:999px;border:2px solid var(--bg-soft);
  background:#fff;cursor:pointer;transition:transform .15s,border-color .15s}
.deck button:hover{transform:translateY(-2px);border-color:color-mix(in srgb,var(--accent,#fbbf24) 60%,transparent)}
.deck button.active{background:var(--accent-dark,#a16207);color:#fff;border-color:var(--accent-dark,#a16207)}
.tcard-wrap{display:grid;grid-template-columns:minmax(280px,360px) 1fr;gap:20px;margin-top:18px;align-items:start}
@media(max-width:760px){.tcard-wrap{grid-template-columns:1fr}}
.tcard{border-radius:20px;padding:10px;background:linear-gradient(135deg,#fbbf24,#a16207);box-shadow:0 10px 30px rgba(161,98,7,.25)}
.tcard .inner{background:#fffbeb;border-radius:14px;overflow:hidden}
.tcard .thead{display:flex;justify-content:space-between;align-items:center;padding:12px 16px 6px}
.tcard .tname{font-family:"Fredoka",sans-serif;font-weight:700;font-size:22px;color:#1a1135}
.tcard .ttitle{font-size:12px;font-weight:800;letter-spacing:.05em;text-transform:uppercase;color:#a16207}
.tcard .art{height:150px;display:grid;place-items:center;font-size:72px;margin:8px 12px;border-radius:12px;
  box-shadow:inset 0 0 30px rgba(0,0,0,.25)}
.tcard .stats{padding:6px 16px 14px}
.tcard .srow{display:flex;gap:8px;padding:7px 0;border-bottom:1px dashed #fde68a;font-size:13.5px;line-height:1.45}
.tcard .srow:last-child{border-bottom:none}
.tcard .srow .k{flex:none;width:104px;font-weight:800;color:#a16207}
.storybox{background:var(--bg-soft);border-radius:16px;padding:18px 20px}
.storybox h3{margin:0 0 8px;font-family:"Fredoka",sans-serif}
.storybox p{margin:0;font-size:15.5px;line-height:1.7}
.cardnav{display:flex;gap:10px;margin-top:14px}
.sharednote{margin-top:10px;font-size:13px;font-weight:700;color:var(--text-dim);background:#fef3c7;border-radius:10px;padding:8px 12px}

/* ---------- info tab cards (compact intro) ---------- */
.infotabs{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px}
.infotab{font:inherit;background:#fff;border:2px solid var(--bg-soft);border-radius:16px;padding:16px 12px;text-align:center;cursor:pointer;
  transition:transform .15s ease,border-color .15s ease}
.infotab:hover{transform:translateY(-3px);border-color:color-mix(in srgb,var(--accent,#fbbf24) 60%,transparent)}
.infotab .ii{font-size:30px}
.infotab .it{font-family:"Fredoka",sans-serif;font-weight:600;font-size:15px;margin-top:6px}
.infotab.active{background:var(--accent-dark,#a16207);border-color:var(--accent-dark,#a16207)}
.infotab.active .it{color:#fff}
.infopanel{display:none;background:var(--bg-soft);border-radius:16px;padding:18px 20px;margin-top:12px}
.infopanel.show{display:block}
.infopanel p,.infopanel li{font-size:15.5px;line-height:1.7}
.infopanel ul{margin:6px 0 0;padding-left:22px}