/* ============================================================
   PSY 315 — Stats, Demystified  ·  CoolPsychology.com/psy315
   Playful companion site · course palette (navy/coral/gold/teal)
   ============================================================ */

/* ---------- Fonts ---------- */
@import url('https://fonts.googleapis.com/css2?family=Fredoka:wght@400;500;600;700&family=Nunito:ital,wght@0,400;0,600;0,700;0,800;1,400&display=swap');

/* ---------- Design tokens ---------- */
:root{
  --navy:#1E2761;
  --navy-2:#2B3580;
  --navy-deep:#161B45;
  --coral:#FF6B5C;
  --coral-dark:#E8503F;
  --gold:#FFC857;
  --gold-dark:#F0A82E;
  --teal:#2A9D8F;
  --teal-dark:#218377;
  --cream:#FFF7EE;
  --cream-2:#FBEFE0;
  --paper:#FFFFFF;
  --ink:#1F2547;
  --ink-soft:#4A4F70;
  --muted:#7C82A1;
  --line:#E7E0D4;
  --good:#2A9D8F;
  --bad:#E8503F;

  --shadow-sm:0 2px 6px rgba(30,39,97,.08);
  --shadow:0 8px 24px rgba(30,39,97,.12);
  --shadow-lg:0 18px 50px rgba(30,39,97,.20);
  --radius:18px;
  --radius-lg:28px;
  --maxw:1080px;
  --display:'Fredoka',system-ui,sans-serif;
  --body:'Nunito',system-ui,sans-serif;
}

/* ---------- Reset ---------- */
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--body);
  color:var(--ink);
  background:var(--cream);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:var(--coral-dark);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3,h4{font-family:var(--display);line-height:1.15;color:var(--navy);font-weight:600}
h1{font-size:clamp(2.1rem,5vw,3.4rem)}
h2{font-size:clamp(1.6rem,3.4vw,2.4rem)}
h3{font-size:1.3rem}
section{position:relative}

/* ---------- Layout helpers ---------- */
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 22px}
.narrow{max-width:760px}
.center{text-align:center}
.pad{padding:64px 0}
.pad-sm{padding:40px 0}
.grid{display:grid;gap:22px}
.cols-2{grid-template-columns:repeat(2,1fr)}
.cols-3{grid-template-columns:repeat(3,1fr)}
.cols-4{grid-template-columns:repeat(4,1fr)}
@media(max-width:860px){.cols-2,.cols-3,.cols-4{grid-template-columns:1fr}}
.eyebrow{font-family:var(--display);font-weight:600;letter-spacing:.12em;text-transform:uppercase;
  font-size:.8rem;color:var(--coral);margin-bottom:.5rem}

/* ---------- Top nav ---------- */
.nav{position:sticky;top:0;z-index:50;background:rgba(30,39,97,.96);
  backdrop-filter:blur(8px);box-shadow:var(--shadow-sm)}
.nav .wrap{display:flex;align-items:center;gap:16px;height:64px}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--display);
  font-weight:700;color:#fff;font-size:1.18rem}
.brand:hover{text-decoration:none}
.brand .sigma{width:34px;height:34px;flex:0 0 auto}
.brand small{display:block;font-family:var(--body);font-weight:600;font-size:.62rem;
  letter-spacing:.16em;color:var(--gold);text-transform:uppercase;margin-top:-3px}
.nav-links{margin-left:auto;display:flex;align-items:center;gap:6px;flex-wrap:wrap}
.nav-links a{color:#dfe2f3;font-weight:700;font-size:.92rem;padding:8px 12px;border-radius:10px;
  transition:.18s}
.nav-links a:hover{background:rgba(255,255,255,.1);color:#fff;text-decoration:none}
.nav-links a.cta{background:var(--coral);color:#fff}
.nav-links a.cta:hover{background:var(--coral-dark)}
.nav-toggle{display:none;margin-left:auto;background:none;border:0;cursor:pointer;padding:8px}
.nav-toggle span{display:block;width:26px;height:3px;background:#fff;border-radius:3px;margin:5px 0;transition:.2s}
.nav-drop{position:relative}
.nav-drop>button{display:flex;align-items:center;gap:5px;background:none;border:0;cursor:pointer;
  font-family:var(--body);color:#dfe2f3;font-weight:700;font-size:.92rem;padding:8px 12px;border-radius:10px;transition:.18s}
.nav-drop>button:hover,.nav-drop.open>button{background:rgba(255,255,255,.1);color:#fff}
.nav-drop-menu{position:absolute;top:calc(100% + 6px);right:0;background:var(--navy-deep);border-radius:12px;
  box-shadow:0 14px 28px rgba(0,0,0,.35);padding:8px;min-width:190px;display:none;flex-direction:column;gap:2px}
.nav-drop.open .nav-drop-menu{display:flex}
.nav-drop-menu a{display:block;white-space:nowrap}
@media(max-width:820px){
  .nav-toggle{display:block}
  .nav-links{position:absolute;top:64px;left:0;right:0;background:var(--navy-deep);
    flex-direction:column;align-items:stretch;gap:0;padding:0 16px;
    max-height:0;overflow:hidden;transition:max-height .3s ease,padding .25s ease}
  .nav-links.open{max-height:480px;padding:8px 16px 18px;box-shadow:0 14px 24px rgba(0,0,0,.22)}
  .nav-links a{padding:12px 10px;border-bottom:1px solid rgba(255,255,255,.07)}
  .nav-links a.cta{margin-top:10px;text-align:center;border:0}
  .nav-drop{display:contents}
  .nav-drop>button{display:none}
  .nav-drop-menu{display:contents}
}

/* ---------- Buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:9px;font-family:var(--display);font-weight:600;
  font-size:1rem;padding:13px 24px;border-radius:999px;border:0;cursor:pointer;transition:.18s;
  box-shadow:var(--shadow-sm);text-decoration:none}
.btn:hover{transform:translateY(-2px);box-shadow:var(--shadow);text-decoration:none}
.btn:active{transform:translateY(0)}
.btn-coral{background:var(--coral);color:#fff}
.btn-coral:hover{background:var(--coral-dark);color:#fff}
.btn-gold{background:var(--gold);color:var(--navy)}
.btn-gold:hover{background:var(--gold-dark)}
.btn-teal{background:var(--teal);color:#fff}
.btn-teal:hover{background:var(--teal-dark);color:#fff}
.btn-ghost{background:#fff;color:var(--navy);border:2px solid var(--line)}
.btn-ghost:hover{border-color:var(--coral);color:var(--coral-dark)}
.btn-sm{padding:9px 16px;font-size:.9rem}

/* ---------- Cards ---------- */
.card{background:var(--paper);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow-sm);
  border:1px solid var(--line);transition:.2s}
.card.lift:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
.card h3{margin-bottom:.4rem}

/* ---------- Hero ---------- */
.hero{background:radial-gradient(120% 120% at 80% -10%,var(--navy-2) 0%,var(--navy) 45%,var(--navy-deep) 100%);
  color:#fff;padding:54px 0 70px;position:relative;overflow:hidden}
.prof-name{display:block;font-family:var(--display);font-weight:600;color:var(--gold);
  white-space:nowrap;line-height:1.1;margin:0 0 10px;font-size:clamp(2rem,5vw,3.2rem)}
.hero h1{color:#fff}
.hero .accent{color:var(--gold)}
.hero p.lede{font-size:1.2rem;color:#d7dbf2;max-width:30em;margin:18px 0 26px}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:30px;align-items:center}
@media(max-width:860px){.hero-grid{grid-template-columns:1fr}}
.hero-cta{display:flex;gap:12px;flex-wrap:wrap}
.float-blob{position:absolute;border-radius:50%;filter:blur(2px);opacity:.5;animation:float 9s ease-in-out infinite}
.blob-1{width:160px;height:160px;background:var(--coral);top:8%;right:6%}
.blob-2{width:90px;height:90px;background:var(--gold);bottom:14%;left:4%;animation-delay:1.5s}
.blob-3{width:60px;height:60px;background:var(--teal);top:40%;left:46%;animation-delay:3s}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-22px)}}

/* ---------- Mascot ---------- */
.mascot{width:100%;max-width:280px;margin:0 auto;filter:drop-shadow(0 14px 26px rgba(0,0,0,.3));position:relative;z-index:1}
.mascot.bob{animation:bob 4s ease-in-out infinite}
@keyframes bob{0%,100%{transform:translateY(0) rotate(-1deg)}50%{transform:translateY(-12px) rotate(1deg)}}
.speech{position:relative;z-index:3;background:#fff;color:var(--ink);border-radius:16px;padding:14px 18px;
  font-weight:700;box-shadow:var(--shadow);max-width:260px}
.speech:after{content:"";position:absolute;bottom:-12px;left:38px;border:12px solid transparent;
  border-top-color:#fff;border-bottom:0}
.tip-box{display:flex;gap:14px;align-items:flex-start;background:linear-gradient(120deg,var(--cream-2),#fff);
  border:1px solid var(--line);border-left:6px solid var(--gold);border-radius:14px;padding:16px 18px}
.tip-box .sigma-mini{width:48px;height:48px;flex:0 0 auto}
.tip-box b{color:var(--navy)}

/* ---------- Stat counters (animal-ag) ---------- */
.stat-strip{background:var(--navy-deep);color:#fff;border-radius:var(--radius-lg);padding:30px 24px;
  display:grid;grid-template-columns:repeat(4,1fr);gap:18px;text-align:center;box-shadow:var(--shadow)}
@media(max-width:760px){.stat-strip{grid-template-columns:repeat(2,1fr)}}
.stat-strip .num{font-family:var(--display);font-weight:700;font-size:clamp(1.7rem,4vw,2.6rem);color:var(--gold)}
.stat-strip .lbl{font-size:.82rem;color:#c9cdec;font-weight:600;line-height:1.35}
.stat-strip .num.hot{color:#FF3B30;display:inline-block;transform-origin:center;
  animation:numPulse 1.1s ease-in-out infinite;text-shadow:0 0 18px rgba(255,59,48,.45)}
@keyframes numPulse{0%,100%{transform:scale(1)}50%{transform:scale(1.22)}}
@media(prefers-reduced-motion:reduce){.stat-strip .num.hot{animation:none}}

/* ---------- Data in the Wild: LIVE ticker ---------- */
.livecard{margin-top:22px;background:linear-gradient(135deg,var(--navy) 0%,var(--navy-deep) 100%);
  border-radius:var(--radius-lg);padding:24px 22px;box-shadow:var(--shadow);color:#fff}
.livecard-head{display:flex;align-items:center;gap:10px;font-family:var(--display);font-weight:600;
  letter-spacing:.04em;font-size:.95rem;color:#dfe3ff;margin-bottom:18px}
.live-dot{width:11px;height:11px;border-radius:50%;background:var(--coral);flex:none;
  box-shadow:0 0 0 0 rgba(255,107,92,.7);animation:livepulse 1.4s infinite}
@keyframes livepulse{0%{box-shadow:0 0 0 0 rgba(255,107,92,.7)}70%{box-shadow:0 0 0 12px rgba(255,107,92,0)}100%{box-shadow:0 0 0 0 rgba(255,107,92,0)}}
.live-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;text-align:center}
@media(max-width:620px){.live-grid{grid-template-columns:1fr;gap:10px}}
.live-cell{display:flex;flex-direction:column;align-items:center;gap:4px}
.live-emoji{font-size:1.9rem;line-height:1}
.live-num{font-family:var(--display);font-weight:700;font-size:clamp(2rem,6vw,3.4rem);
  font-variant-numeric:tabular-nums;line-height:1}
.live-lbl{font-size:.86rem;color:#c9cdec;font-weight:600;text-transform:capitalize}
.live-lbl small{color:#9298c8;text-transform:none}
.live-foot{margin:18px 0 0;font-size:.82rem;color:#aab0dd;line-height:1.4}
.live-foot b{color:var(--gold)}

/* ---------- Data in the Wild: growing bar chart ---------- */
.chartcard{margin-top:22px;background:var(--paper);border-radius:var(--radius-lg);
  padding:22px;box-shadow:var(--shadow-sm);border:1px solid var(--line)}
.chartcard-head{display:flex;justify-content:space-between;align-items:flex-end;gap:14px;flex-wrap:wrap;margin-bottom:14px}
.scale-toggle{display:inline-flex;background:var(--cream-2);border-radius:999px;padding:4px;gap:2px}
.scale-btn{font-family:var(--display);font-weight:600;font-size:.85rem;border:none;cursor:pointer;
  padding:7px 16px;border-radius:999px;background:transparent;color:var(--ink-soft);transition:.18s}
.scale-btn.active{background:var(--coral);color:#fff;box-shadow:var(--shadow-sm)}
.bar-caption{margin:14px 2px 0;font-size:.92rem;color:var(--ink-soft);line-height:1.5}
.bar-caption b{color:var(--navy)}

/* ---------- Data in the Wild: one number, six ways ---------- */
.sixways{margin-top:22px}
.sixways-lead{font-family:var(--display);font-weight:600;color:var(--navy);font-size:1.05rem;
  text-align:center;max-width:40em;margin:0 auto 18px}
.sixways-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
@media(max-width:760px){.sixways-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:440px){.sixways-grid{grid-template-columns:1fr}}
.sw-card{position:relative;background:var(--paper);border:1px solid var(--line);border-radius:14px;
  padding:18px 16px;text-align:center;box-shadow:var(--shadow-sm);transition:.18s}
.sw-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.sw-kind{display:inline-block;font-family:var(--display);font-weight:600;font-size:.66rem;
  letter-spacing:.08em;text-transform:uppercase;color:var(--teal);background:#E6F4F1;
  padding:3px 9px;border-radius:999px;margin-bottom:8px}
.sw-value{font-family:var(--display);font-weight:700;font-size:clamp(1.4rem,3.4vw,1.9rem);color:var(--coral);line-height:1.1}
.sw-label{font-weight:700;color:var(--navy);font-size:.92rem;margin-top:4px}
.sw-note{font-size:.8rem;color:var(--muted);margin-top:3px}

/* ---------- Block cards ---------- */
.block-card{position:relative;overflow:hidden}
.block-card .tag{display:inline-block;font-family:var(--display);font-weight:600;font-size:.72rem;
  letter-spacing:.08em;text-transform:uppercase;color:#fff;padding:4px 11px;border-radius:999px;margin-bottom:10px}
.b1{background:var(--coral)} .b2{background:var(--teal)} .b3{background:var(--navy-2)} .b4{background:var(--gold-dark)}
.block-card ul{list-style:none;margin:12px 0 0;font-size:.94rem}
.block-card li{padding:5px 0 5px 26px;position:relative;color:var(--ink-soft)}
.block-card li:before{content:"";position:absolute;left:4px;top:12px;width:9px;height:9px;border-radius:50%;
  background:var(--gold)}
.block-stripe{position:absolute;top:0;left:0;width:7px;height:100%}

/* ---------- Unit cards ---------- */
.unit-card{display:flex;flex-direction:column;gap:6px;text-decoration:none;color:inherit}
.unit-card:hover{text-decoration:none}
.unit-num{font-family:var(--display);font-weight:700;font-size:.78rem;color:var(--coral);letter-spacing:.06em}
.unit-card .icon{font-size:1.7rem}
.badge-soon{font-size:.66rem;font-weight:800;letter-spacing:.06em;text-transform:uppercase;
  background:var(--cream-2);color:var(--muted);padding:3px 9px;border-radius:999px;align-self:flex-start}
.badge-live{background:var(--teal);color:#fff}

/* ---------- Feature pills ---------- */
.feature{display:flex;gap:14px;align-items:flex-start}
.feature .ico{width:46px;height:46px;border-radius:13px;display:grid;place-items:center;font-size:1.4rem;
  flex:0 0 auto;background:var(--cream-2)}
.feature h4{font-family:var(--display);color:var(--navy);margin-bottom:2px;font-size:1.08rem}
.feature p{font-size:.93rem;color:var(--ink-soft)}

/* ---------- Reading / content ---------- */
.content{font-size:1.05rem}
.content h2{margin:34px 0 12px}
.content h3{margin:24px 0 8px;color:var(--coral-dark)}
.content p{margin:0 0 14px}
.content ul,.content ol{margin:0 0 16px 22px}
.content li{margin:6px 0}
.content code{background:#f4eee3;border:1px solid var(--line);border-radius:6px;padding:1px 7px;
  font-family:'SFMono-Regular',Consolas,monospace;font-size:.9em;color:var(--navy)}
.content pre{background:var(--navy-deep);color:#e8eafc;border-radius:12px;padding:16px 18px;overflow-x:auto;
  margin:0 0 16px;font-size:.92rem}
.content pre code{background:none;border:0;color:inherit;padding:0}
.lead{font-size:1.18rem;color:var(--ink-soft)}

/* ---------- Callout boxes ---------- */
.callout{border-radius:14px;padding:18px 20px;margin:20px 0;border:1px solid var(--line)}
.callout .head{font-family:var(--display);font-weight:600;font-size:1.05rem;margin-bottom:6px;
  display:flex;align-items:center;gap:8px}
.callout p:last-child{margin-bottom:0}
.callout-gold{background:#FFF6E2;border-color:#F4D58A;border-left:6px solid var(--gold)}
.callout-gold .head{color:var(--gold-dark)}
.callout-teal{background:#E6F4F1;border-color:#A8D8D0;border-left:6px solid var(--teal)}
.callout-teal .head{color:var(--teal-dark)}
.callout-coral{background:#FFEDEA;border-color:#FBC0B8;border-left:6px solid var(--coral)}
.callout-coral .head{color:var(--coral-dark)}
.callout-navy{background:#ECEEF9;border-color:#C3C8EA;border-left:6px solid var(--navy-2)}
.callout-navy .head{color:var(--navy)}

/* ---------- Goal chips ---------- */
.goals{list-style:none;margin:0;display:grid;gap:10px}
.goals li{display:flex;gap:12px;align-items:flex-start;background:#fff;border:1px solid var(--line);
  border-radius:12px;padding:12px 16px}
.goals .chk{width:26px;height:26px;border-radius:50%;background:var(--teal);color:#fff;display:grid;
  place-items:center;font-weight:800;flex:0 0 auto;font-size:.9rem}

/* ---------- Tables ---------- */
.tbl{width:100%;border-collapse:collapse;margin:0 0 18px;font-size:.96rem;background:#fff;
  border-radius:12px;overflow:hidden;box-shadow:var(--shadow-sm)}
.tbl th{background:var(--navy);color:#fff;font-family:var(--display);font-weight:600;text-align:left;
  padding:11px 14px;font-size:.92rem}
.tbl td{padding:10px 14px;border-top:1px solid var(--line)}
.tbl tr:nth-child(even) td{background:#FBF6EE}
.tbl .num{text-align:right;font-variant-numeric:tabular-nums}

/* ---------- Quiz ---------- */
.quiz{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;
  box-shadow:var(--shadow-sm)}
.quiz-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:8px;flex-wrap:wrap}
.quiz-progress{height:9px;background:var(--cream-2);border-radius:999px;overflow:hidden;margin:12px 0 18px}
.quiz-progress > span{display:block;height:100%;background:linear-gradient(90deg,var(--teal),var(--gold));
  width:0;transition:width .4s ease}
.q-text{font-size:1.18rem;font-weight:800;color:var(--navy);margin-bottom:16px;font-family:var(--body)}
.q-opts{display:grid;gap:10px}
.opt{display:flex;align-items:center;gap:12px;width:100%;text-align:left;background:#fff;
  border:2px solid var(--line);border-radius:13px;padding:13px 16px;cursor:pointer;font-size:1rem;
  font-weight:700;color:var(--ink);transition:.15s;font-family:var(--body)}
.opt:hover{border-color:var(--coral);background:#FFF7F5}
.opt .key{width:28px;height:28px;border-radius:8px;background:var(--cream-2);display:grid;place-items:center;
  font-family:var(--display);font-weight:600;flex:0 0 auto}
.opt.correct{border-color:var(--teal);background:#E6F4F1}
.opt.correct .key{background:var(--teal);color:#fff}
.opt.wrong{border-color:var(--bad);background:#FFEDEA}
.opt.wrong .key{background:var(--bad);color:#fff}
.opt:disabled{cursor:default}
.q-feedback{margin-top:14px;padding:13px 16px;border-radius:12px;font-weight:700;display:none}
.q-feedback.show{display:block;animation:pop .3s ease}
.q-feedback.ok{background:#E6F4F1;color:var(--teal-dark);border:1px solid #A8D8D0}
.q-feedback.no{background:#FFEDEA;color:var(--coral-dark);border:1px solid #FBC0B8}
@keyframes pop{from{transform:scale(.96);opacity:0}to{transform:scale(1);opacity:1}}
.quiz-result{text-align:center;padding:18px 0}
.quiz-result .score{font-family:var(--display);font-weight:700;font-size:3rem;color:var(--coral)}
.quiz-nav{display:flex;justify-content:space-between;gap:12px;margin-top:18px}

/* ---------- Calculators ---------- */
.calc{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;
  box-shadow:var(--shadow-sm);margin-bottom:22px;scroll-margin-top:84px}
.calc h3{display:flex;align-items:center;gap:10px}
.calc .emoji{font-size:1.4rem}
.calc label{display:block;font-weight:800;font-size:.85rem;color:var(--ink-soft);margin:12px 0 5px;
  text-transform:uppercase;letter-spacing:.04em}
.calc textarea,.calc input[type=text],.calc input[type=number],.calc select{
  width:100%;font-family:var(--body);font-size:1rem;padding:11px 13px;border:2px solid var(--line);
  border-radius:11px;background:#FFFDF9;color:var(--ink);transition:.15s}
.calc textarea:focus,.calc input:focus,.calc select:focus{outline:0;border-color:var(--teal)}
.calc textarea{min-height:74px;resize:vertical;font-variant-numeric:tabular-nums}
.calc-row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
@media(max-width:620px){.calc-row{grid-template-columns:1fr}}
.calc-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:16px}
.calc-out{margin-top:18px;border-top:2px dashed var(--line);padding-top:16px;display:none}
.calc-out.show{display:block;animation:pop .3s ease}
.result-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:12px}
.result-pill{background:var(--cream-2);border-radius:13px;padding:12px 14px;text-align:center}
.result-pill .v{font-family:var(--display);font-weight:700;font-size:1.5rem;color:var(--navy);
  font-variant-numeric:tabular-nums}
.result-pill .k{font-size:.74rem;font-weight:800;text-transform:uppercase;letter-spacing:.05em;color:var(--muted)}
.result-pill.hi .v{color:var(--coral)}
.interp{margin-top:14px;background:#ECEEF9;border-radius:12px;padding:13px 16px;font-weight:600;color:var(--navy)}
.interp b{color:var(--coral-dark)}
.calc-jump{position:sticky;top:74px;z-index:5;background:var(--cream);padding:10px 0;display:flex;gap:8px;
  flex-wrap:wrap;border-bottom:1px solid var(--line);margin-bottom:18px}
.calc-jump a{font-family:var(--display);font-weight:500;font-size:.82rem;background:#fff;border:1px solid var(--line);
  padding:6px 12px;border-radius:999px;color:var(--navy)}
.calc-jump a:hover{background:var(--navy);color:#fff;text-decoration:none}

/* ---------- Interactive histogram / canvas ---------- */
.viz{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow-sm)}
.viz canvas{width:100%;height:auto;display:block;border-radius:10px}
.slider-row{display:flex;align-items:center;gap:14px;margin-top:14px;flex-wrap:wrap}
.slider-row input[type=range]{flex:1;min-width:160px;accent-color:var(--coral)}
.pillbtn{font-family:var(--display);font-weight:500;font-size:.85rem;background:#fff;border:2px solid var(--line);
  padding:7px 14px;border-radius:999px;cursor:pointer;color:var(--navy)}
.pillbtn.active{background:var(--coral);color:#fff;border-color:var(--coral)}

/* ---------- Progress widget ---------- */
.xp-widget{display:flex;align-items:center;gap:16px;background:var(--navy);color:#fff;border-radius:var(--radius);
  padding:18px 22px;box-shadow:var(--shadow)}
.xp-ring{width:62px;height:62px;flex:0 0 auto}
.xp-widget .lvl{font-family:var(--display);font-weight:700;font-size:1.2rem}
.xp-widget .sub{font-size:.85rem;color:#c9cdec}
.badge-tray{display:flex;gap:8px;flex-wrap:wrap;margin-left:auto}
.badge{width:42px;height:42px;border-radius:12px;display:grid;place-items:center;font-size:1.2rem;
  background:rgba(255,255,255,.12);position:relative}
.badge.earned{background:var(--gold);color:var(--navy)}
.badge.locked{opacity:.4}

/* ---------- Footer ---------- */
.foot{background:var(--navy-deep);color:#c9cdec;padding:40px 0 30px;margin-top:50px}
.foot a{color:var(--gold)}
.foot .wrap{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;align-items:center}
.foot .brand{font-size:1.05rem}
.foot small{font-size:.82rem;color:#8d92be}

/* ---------- Breadcrumb ---------- */
.crumb{font-size:.86rem;color:var(--muted);font-weight:700;padding:16px 0 0}
.crumb a{color:var(--coral-dark)}

/* ---------- Misc ---------- */
.pill-tags{display:flex;gap:8px;flex-wrap:wrap}
.pill-tags span{background:var(--cream-2);border:1px solid var(--line);border-radius:999px;padding:5px 13px;
  font-weight:700;font-size:.85rem;color:var(--navy)}
.hr{height:1px;background:var(--line);border:0;margin:30px 0}
.text-coral{color:var(--coral-dark)}
.text-teal{color:var(--teal-dark)}
.mt0{margin-top:0}.mb0{margin-bottom:0}
.toast{position:fixed;bottom:22px;left:50%;transform:translateX(-50%) translateY(120px);
  background:var(--navy);color:#fff;font-weight:800;padding:14px 22px;border-radius:999px;
  box-shadow:var(--shadow-lg);z-index:80;transition:transform .35s cubic-bezier(.2,1.3,.4,1);display:flex;
  align-items:center;gap:10px}
.toast.show{transform:translateX(-50%) translateY(0)}
.toast .em{font-size:1.3rem}

/* ============================================================
   Reading interactives (unit deep-readings)  ·  added 2026-06-20
   Self-checks · steppers · classify game · read toolbar · print
   ============================================================ */

/* ---- Read toolbar (PDF + meta + section jump) ---- */
.read-bar{display:flex;align-items:center;gap:14px;flex-wrap:wrap;background:#fff;border:1px solid var(--line);
  border-radius:14px;padding:12px 16px;box-shadow:var(--shadow-sm);margin:18px 0 6px}
.read-bar .meta{font-weight:700;color:var(--muted);font-size:.9rem;display:flex;gap:8px;align-items:center}
.read-bar .sp{flex:1}
.secnav{display:flex;gap:8px;flex-wrap:wrap;margin:14px 0 4px}
.secnav a{font-family:var(--display);font-weight:500;font-size:.82rem;background:#fff;border:1px solid var(--line);
  padding:6px 13px;border-radius:999px;color:var(--navy)}
.secnav a:hover{background:var(--navy);color:#fff;text-decoration:none}

/* ---- Inline self-check ---- */
.selfcheck{background:#fff;border:1px solid var(--line);border-left:6px solid var(--teal);border-radius:14px;
  padding:16px 18px;margin:22px 0;box-shadow:var(--shadow-sm)}
.selfcheck .q{font-weight:800;color:var(--navy);display:flex;gap:10px;align-items:flex-start;font-size:1.02rem}
.selfcheck .q .qt{flex:1;min-width:0}
.selfcheck .q .tag{flex:0 0 auto;font-family:var(--display);font-weight:600;font-size:.72rem;letter-spacing:.06em;
  text-transform:uppercase;background:var(--teal);color:#fff;border-radius:999px;padding:3px 10px;margin-top:2px}
.selfcheck .opts{display:flex;gap:8px;flex-wrap:wrap;margin:12px 0 0}
.selfcheck .opt-sc{font-weight:700;background:#fff;border:2px solid var(--line);border-radius:11px;padding:9px 15px;
  cursor:pointer;color:var(--ink);transition:.15s;font-family:var(--body);font-size:.95rem}
.selfcheck .opt-sc:hover{border-color:var(--coral);background:#FFF7F5}
.selfcheck .opt-sc.ok{border-color:var(--teal);background:#E6F4F1;color:var(--teal-dark)}
.selfcheck .opt-sc.no{border-color:var(--bad);background:#FFEDEA;color:var(--coral-dark)}
.selfcheck .ans{display:none;margin-top:13px;background:#ECEEF9;border-radius:11px;padding:12px 15px;
  font-weight:600;color:var(--navy)}
.selfcheck .ans.show{display:block;animation:pop .3s ease}
.selfcheck .ans b{color:var(--coral-dark)}

/* ---- Step-through worked example ---- */
.stepper{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:20px 22px;margin:22px 0;
  box-shadow:var(--shadow-sm)}
.stepper .s-h{font-family:var(--display);font-weight:600;color:var(--navy);font-size:1.12rem;margin-bottom:4px}
.stepper .s-sub{color:var(--ink-soft);font-size:.95rem;margin-bottom:8px}
.stepper .step{display:none;border-left:3px solid var(--gold);margin:12px 0 0;padding:4px 0 4px 16px}
.stepper .step.show{display:block;animation:pop .3s ease}
.stepper .step .lab{font-weight:800;color:var(--gold-dark);font-size:.74rem;text-transform:uppercase;
  letter-spacing:.05em;display:block;margin-bottom:3px}
.stepper .step .math{font-family:'SFMono-Regular',Consolas,monospace;background:#f4eee3;border:1px solid var(--line);
  border-radius:8px;padding:8px 12px;display:inline-block;margin-top:6px;color:var(--navy);font-size:.98rem}
.stepper .s-actions{margin-top:16px;display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.stepper .s-done{display:none;font-weight:800;color:var(--teal-dark)}
.stepper .s-done.show{display:inline-flex;gap:6px;align-items:center}

/* ---- Click-to-classify (NOIR) game ---- */
.classify{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;
  box-shadow:var(--shadow-sm);margin:22px 0}
.classify .c-h{font-family:var(--display);font-weight:600;color:var(--navy);font-size:1.12rem;margin-bottom:4px}
.classify .c-sub{color:var(--ink-soft);font-size:.95rem;margin-bottom:14px}
.classify .pool{display:flex;flex-wrap:wrap;gap:9px;margin-bottom:16px;min-height:46px;padding:10px;
  background:var(--cream);border-radius:12px;border:1px dashed var(--line)}
.classify .vchip{background:#fff;border:2px solid var(--line);border-radius:999px;padding:8px 15px;font-weight:800;
  color:var(--navy);cursor:pointer;font-size:.94rem;transition:.15s;font-family:'SFMono-Regular',Consolas,monospace}
.classify .vchip:hover{border-color:var(--coral);transform:translateY(-1px)}
.classify .vchip.sel{border-color:var(--coral);background:#FFF7F5;box-shadow:0 0 0 3px rgba(255,107,92,.18)}
.classify .vchip.placed.ok{border-color:var(--teal);background:#E6F4F1;color:var(--teal-dark);cursor:default}
.classify .vchip.placed.no{border-color:var(--bad);background:#FFEDEA;color:var(--coral-dark);cursor:default}
.classify .bins{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
@media(max-width:680px){.classify .bins{grid-template-columns:repeat(2,1fr)}}
.classify .bin{border:2px dashed var(--line);border-radius:14px;padding:12px 10px;min-height:118px;cursor:pointer;transition:.15s}
.classify .bin:hover{border-color:var(--coral);background:#FFFCFA}
.classify .bin h5{font-family:var(--display);font-weight:600;text-align:center;margin-bottom:4px;font-size:1rem}
.classify .bin .hint{font-size:.72rem;color:var(--muted);text-align:center;display:block;margin-bottom:8px}
.classify .bin.nom h5{color:var(--coral-dark)} .classify .bin.ord h5{color:var(--gold-dark)}
.classify .bin.int h5{color:var(--teal-dark)} .classify .bin.rat h5{color:var(--navy)}
.classify .drop{display:flex;flex-wrap:wrap;gap:6px;justify-content:center}
.classify .c-actions{margin-top:16px;display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.classify .c-score{font-weight:800;color:var(--navy)}

/* ---- Print / PDF: clean reading, reveal all answers ---- */
@media print{
  .nav,.read-bar,.secnav,.foot,.nav-toggle,.quiz,.tip-box .sigma-mini,.btn,.s-actions,.c-actions,.opts,.calc,.classify,.viz{display:none !important}
  body{background:#fff;color:#000}
  .selfcheck .ans,.stepper .step{display:block !important}
  .selfcheck .ans{background:#f3f3f3 !important}
  a{color:#000;text-decoration:none}
  .callout,.tbl,.stepper,.selfcheck,.card{break-inside:avoid;box-shadow:none}
  section{padding:14px 0}
  *{-webkit-print-color-adjust:exact;print-color-adjust:exact}
}

/* ---- Text-size control (A− A A+), injected into nav by main.js ---- */
.textsize{display:flex;align-items:center;gap:5px;margin-left:auto}
.textsize button{background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.30);color:#fff;
  font-family:var(--display);font-weight:600;line-height:1;border-radius:9px;cursor:pointer;padding:6px 9px;transition:.15s}
.textsize button:hover{background:rgba(255,255,255,.24)}
.textsize button:active{transform:translateY(1px)}
.textsize .d{font-size:12px}.textsize .r{font-size:15px}.textsize .i{font-size:18px}
@media(max-width:420px){.textsize{gap:3px}.textsize button{padding:5px 7px}}
@media print{.textsize{display:none !important}}

/* ---- Distribution-shape gallery (Unit 2) ---- */
.shapes{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:18px 0}
@media(max-width:680px){.shapes{grid-template-columns:repeat(2,1fr)}}
.shape-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:12px 12px 10px;text-align:center;box-shadow:var(--shadow-sm)}
.shape-card svg{width:100%;height:auto;display:block}
.shape-card .nm{font-family:var(--display);font-weight:600;color:var(--navy);margin-top:6px;font-size:1rem}
.shape-card .ds{font-size:.82rem;color:var(--ink-soft);line-height:1.34;margin-top:2px}
/* Ensure in-content figure SVGs always have a real width (browser + PDF) */
.content svg{width:100%;height:auto;display:block;margin:6px auto}

/* ---------- Mobile reading fixes (2026-06-20) ---------- */
/* Long formulas in inline <code> wrap instead of overflowing the screen edge */
.content code{overflow-wrap:anywhere}
/* Wide data tables become swipe-scrollable on phones instead of being clipped by body{overflow-x:hidden} */
@media(max-width:640px){
  .content .tbl{display:block;overflow-x:auto;-webkit-overflow-scrolling:touch;white-space:nowrap}
}


/* ============ SIGMA — the floating stats guide (Sigma the Cow) ============
   Same behavior as Bodhi on the other course sites; PSY315 palette. */
#sigma-fab{position:fixed;right:20px;bottom:20px;z-index:60;display:flex;flex-direction:column;align-items:flex-end;gap:.6rem}
#sigma-fab .bubble{max-width:320px;background:var(--paper,#fff);color:var(--ink,#1F2547);border:1px solid rgba(30,39,97,.18);
  border-radius:16px 16px 4px 16px;padding:.85rem 1rem;box-shadow:0 10px 30px rgba(22,27,69,.25);font-size:.92rem;line-height:1.55;
  opacity:0;transform:translateY(8px) scale(.96);transition:all .22s ease;pointer-events:none}
#sigma-fab.open .bubble{opacity:1;transform:none;pointer-events:auto}
#sigma-fab .bubble .who{font-weight:800;color:var(--navy-2,#2B3580);font-size:.72rem;text-transform:uppercase;letter-spacing:.09em;display:block;margin-bottom:.25rem}
#sigma-fab .bubble .more{margin-top:.6rem;display:flex;gap:.5rem}
#sigma-fab .bubble .more button{border:1px solid rgba(30,39,97,.25);background:#fff;border-radius:999px;padding:.25rem .7rem;
  font:inherit;font-size:.78rem;font-weight:700;cursor:pointer;color:var(--navy-2,#2B3580)}
#sigma-fab .bubble .more button:hover{background:var(--cream-2,#FBEFE0);border-color:var(--gold,#FFC857)}
#sigma-btn{position:relative;width:66px;height:66px;border-radius:50%;border:2px solid var(--gold,#FFC857);cursor:pointer;
  background:var(--cream,#FFF7EE);box-shadow:0 10px 30px rgba(22,27,69,.28);display:grid;place-items:center;transition:transform .18s,box-shadow .18s}
#sigma-btn:hover{transform:translateY(-3px)}
#sigma-btn svg{width:52px;height:52px;animation:sigma-bob 4s ease-in-out infinite}
@keyframes sigma-bob{0%,100%{transform:translateY(0) rotate(-1deg)}50%{transform:translateY(-3px) rotate(1deg)}}
#sigma-fab .pulse{position:absolute;right:4px;top:2px;width:14px;height:14px;border-radius:50%;background:var(--coral,#FF6B5C);
  border:2px solid #fff;box-shadow:0 0 0 0 rgba(255,107,92,.55);animation:sigma-pp 2.4s infinite}
@keyframes sigma-pp{0%{box-shadow:0 0 0 0 rgba(255,107,92,.55)}70%{box-shadow:0 0 0 12px transparent}100%{box-shadow:0 0 0 0 transparent}}
@media(prefers-reduced-motion:reduce){#sigma-btn svg{animation:none}}
@media(max-width:520px){#sigma-fab .bubble{max-width:230px}}
@media print{#sigma-fab{display:none !important}}