/* CruxStudy — SAT · PSAT prep by CruxSci */
:root{
  --ink:#f4f5f7; --panel:#ffffff; --panel2:#fafafb; --line:#e2e3e8;
  --text:#1c1d22; --dim:#565961; --muted:#7a7d85; --tint:#f0f1f3;
  --accent:#c1121f; --accent2:#e2444f; --gold:#b3122b; --navy:#0B1F33;
  --green:#2f9e69; --amber:#c07f10; --red:#cf2e2e; --blue:#2b6cb0;
  --shadow:0 10px 28px rgba(11,31,51,.10);
  --radius:14px;
}
html.theme-dark{
  --ink:#131417; --panel:#1a1c20; --panel2:#212328; --line:#2c2e34;
  --text:#e9eaee; --dim:#a3a7b0; --muted:#7d8089; --tint:#212328;
  --accent:#e2444f; --accent2:#ff6b74; --gold:#e2444f; --navy:#0d2236;
  --green:#43c98a; --amber:#e0a63a; --blue:#5f9bd8;
  --shadow:0 10px 28px rgba(0,0,0,.35);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  min-height:100vh;color:var(--text);
  background:radial-gradient(1100px 560px at 72% -12%,var(--panel) 0%,var(--ink) 55%) fixed;
  font-family:"Segoe UI",Roboto,Arial,sans-serif;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,.wordmark,.bigscore{font-family:"Syne","Segoe UI",Roboto,Arial,sans-serif}
a{color:inherit}
button{font-family:inherit}

/* ---------- top bar ---------- */
.topbar{display:flex;align-items:center;gap:10px;padding:10px 18px;background:var(--panel);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:40}
.wordmark{display:flex;align-items:center;gap:9px;text-decoration:none;cursor:pointer}
.wordmark .spec{display:flex;gap:3px}
.wordmark .spec i{width:10px;height:10px;border-radius:50%}
.wordmark b{font-size:18px;letter-spacing:.2px}
.wordmark b span{color:var(--accent)}
.wordmark small{display:block;font-size:9.5px;letter-spacing:1.6px;color:var(--muted);font-weight:700;text-transform:uppercase;font-family:"Segoe UI",Roboto,Arial,sans-serif}
.grow{flex:1}
.nav{display:flex;gap:6px;align-items:center;flex-wrap:wrap}
.navlink{text-decoration:none;color:var(--dim);font-size:13px;padding:7px 11px;border:1px solid transparent;border-radius:9px;cursor:pointer;background:none;font-weight:600}
.navlink:hover{color:var(--text);border-color:var(--line)}
.navlink.on{color:var(--accent);border-color:var(--line);background:var(--tint)}
.navlink.cta{background:var(--accent);color:#fff;font-weight:700}
.navlink.cta:hover{filter:brightness(1.1);color:#fff}

/* exam toggle */
.examtog{display:flex;border:1px solid var(--line);border-radius:20px;overflow:hidden;background:var(--tint)}
.examtog button{border:none;background:none;padding:6px 14px;font-size:12.5px;font-weight:800;color:var(--muted);cursor:pointer;letter-spacing:.4px}
.examtog button.on{background:var(--navy);color:#fff}
html.theme-dark .examtog button.on{background:var(--accent)}

/* ---------- layout ---------- */
.wrap{max-width:1040px;margin:0 auto;padding:26px 18px 80px}
.kicker{font-size:12px;letter-spacing:2.4px;text-transform:uppercase;color:var(--accent);font-weight:800}
h1{font-size:clamp(30px,5.5vw,44px);margin:8px 0 10px;line-height:1.08}
h1 .hl{color:var(--accent)}
.sub{color:var(--dim);max-width:680px;font-size:15.5px;line-height:1.6;margin:0}
.cta-row{display:flex;gap:12px;margin-top:22px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;text-decoration:none;border:none;border-radius:11px;padding:12px 20px;font-size:14.5px;font-weight:700;cursor:pointer;transition:.15s}
.btn.primary{background:var(--accent);color:#fff}
.btn.dark{background:var(--navy);color:#fff}
html.theme-dark .btn.dark{background:var(--panel2);border:1px solid var(--line)}
.btn.ghost{background:transparent;border:1px solid var(--line);color:var(--dim)}
.btn.ghost:hover{color:var(--text);border-color:var(--accent)}
.btn:hover{filter:brightness(1.06)}
.btn:disabled{opacity:.45;cursor:not-allowed;filter:none}
.btn.small{padding:8px 14px;font-size:13px;border-radius:9px}
.btn.big{padding:14px 26px;font-size:16px}

.sec-h{margin:38px 0 4px;font-size:13.5px;color:var(--accent);letter-spacing:1.2px;text-transform:uppercase;font-weight:800}
.sec-sub{color:var(--muted);font-size:13.5px;margin:0 0 14px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:16px;margin-top:14px}
.grid.tight{grid-template-columns:repeat(auto-fill,minmax(230px,1fr))}

.card{display:block;text-decoration:none;color:inherit;background:linear-gradient(180deg,var(--panel),var(--panel2));border:1px solid var(--line);border-radius:var(--radius);padding:20px;transition:.15s;box-shadow:var(--shadow);cursor:pointer;text-align:left}
.card:hover{border-color:var(--accent);transform:translateY(-2px)}
.card h3{margin:4px 0 6px;font-size:19px}
.card p{margin:0;color:var(--dim);font-size:13.5px;line-height:1.5}
.card .go{margin-top:12px;color:var(--accent);font-weight:700;font-size:13px}
.card .emoji{font-size:26px;line-height:1}
.tagi{display:inline-block;font-size:10.5px;font-weight:800;padding:3px 9px;border-radius:20px;background:var(--tint);color:var(--dim);margin-bottom:8px;letter-spacing:.6px;text-transform:uppercase}
.tagi.rw{background:#e8effa;color:#2b6cb0}
.tagi.math{background:#e0f2ea;color:#1a7a52}
.tagi.fun{background:#fbecec;color:var(--accent)}
.tagi.start{background:#f6edd3;color:#775708}
html.theme-dark .tagi.rw{background:#1d2c3e;color:#7fb2e8}
html.theme-dark .tagi.math{background:#173226;color:#5fd6a0}
html.theme-dark .tagi.fun{background:#3a1d20;color:#ff8b93}
html.theme-dark .tagi.start{background:#38301a;color:#e8c66a}

/* hero feature banner */
.feature{margin-top:30px;display:grid;grid-template-columns:1.35fr 1fr;border:1px solid var(--line);border-radius:18px;overflow:hidden;background:linear-gradient(150deg,var(--panel),var(--panel2));box-shadow:var(--shadow)}
@media(max-width:760px){.feature{grid-template-columns:1fr}}
.feature .fl{padding:26px 28px}
.feature .tt{font-size:11px;font-weight:800;color:var(--gold);letter-spacing:2px}
.feature h2{margin:8px 0 8px;font-size:24px}
.feature p{color:var(--dim);font-size:14px;line-height:1.55;margin:0 0 18px}
.feature .fr{background:var(--tint);border-left:1px solid var(--line);padding:22px 24px;display:flex;flex-direction:column;justify-content:center;gap:12px}
@media(max-width:760px){.feature .fr{border-left:none;border-top:1px solid var(--line)}}
.fstat{display:flex;align-items:baseline;gap:10px}
.fstat b{font-size:24px;color:var(--accent);font-weight:800;min-width:52px;font-family:"Syne","Segoe UI",sans-serif}
.fstat span{font-size:13px;color:var(--dim)}

/* ---------- panels / generic ---------- */
.panel{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow)}
.row{display:flex;gap:12px;align-items:center;flex-wrap:wrap}
.spread{justify-content:space-between}
.pill{display:inline-flex;align-items:center;gap:6px;font-size:12px;font-weight:700;padding:4px 11px;border-radius:20px;background:var(--tint);color:var(--dim)}
.pill.good{background:#e0f2ea;color:#1a7a52}
.pill.mid{background:#f6edd3;color:#8a6408}
.pill.low{background:#fbecec;color:#b3252f}
html.theme-dark .pill.good{background:#173226;color:#5fd6a0}
html.theme-dark .pill.mid{background:#38301a;color:#e8c66a}
html.theme-dark .pill.low{background:#3a1d20;color:#ff8b93}
.hr{border:none;border-top:1px solid var(--line);margin:16px 0}
.mut{color:var(--muted);font-size:12.5px}
.foot{margin-top:48px;color:var(--muted);font-size:12px;border-top:1px solid var(--line);padding-top:16px;line-height:1.6}

/* progress bars */
.bar{height:9px;background:var(--tint);border-radius:6px;overflow:hidden;flex:1;min-width:80px}
.bar i{display:block;height:100%;border-radius:6px;background:var(--accent);transition:width .4s}
.bar i.g{background:var(--green)}.bar i.a{background:var(--amber)}.bar i.r{background:var(--red)}.bar i.b{background:var(--blue)}
.domrow{display:grid;grid-template-columns:150px 1fr 78px;gap:12px;align-items:center;padding:9px 0;border-bottom:1px dashed var(--line)}
.domrow:last-child{border-bottom:none}
.domrow .dn{font-size:13.5px;font-weight:600}
.domrow .dp{font-size:12.5px;color:var(--dim);text-align:right;font-variant-numeric:tabular-nums}
@media(max-width:560px){.domrow{grid-template-columns:110px 1fr 64px}.domrow .dn{font-size:12px}}

/* ---------- question runner ---------- */
.runner{max-width:820px;margin:0 auto}
.run-head{display:flex;align-items:center;gap:10px;padding:10px 0;flex-wrap:wrap}
.run-head .qnum{font-weight:800;font-size:14px}
.timer{font-variant-numeric:tabular-nums;font-weight:800;font-size:15px;padding:5px 13px;border-radius:9px;background:var(--tint);color:var(--text)}
.timer.warn{background:#fbecec;color:#b3252f;animation:pulse 1s infinite}
html.theme-dark .timer.warn{background:#3a1d20;color:#ff8b93}
@keyframes pulse{50%{opacity:.55}}
.qcard{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow)}
.qpassage{font-size:15px;line-height:1.65;color:var(--text);margin:0 0 14px;white-space:pre-wrap}
.qpassage .txtlab{display:block;font-size:11px;font-weight:800;letter-spacing:1.2px;color:var(--accent);text-transform:uppercase;margin:10px 0 3px}
.qnotes{margin:0 0 14px;padding-left:22px;font-size:14.5px;line-height:1.6}
.qnotes li{margin-bottom:5px}
.qtable{border-collapse:collapse;margin:0 0 16px;font-size:13.5px;min-width:220px}
.qtable th,.qtable td{border:1px solid var(--line);padding:6px 12px;text-align:left}
.qtable th{background:var(--tint);font-weight:700}
.qprompt{font-size:15.5px;font-weight:600;line-height:1.55;margin:0 0 16px}
.choices{display:flex;flex-direction:column;gap:9px}
.choice{display:flex;align-items:flex-start;gap:12px;border:1.5px solid var(--line);border-radius:11px;padding:12px 14px;cursor:pointer;background:var(--panel2);transition:.12s;font-size:14.5px;line-height:1.5;text-align:left;width:100%}
.choice:hover{border-color:var(--accent2)}
.choice .cl{flex-shrink:0;width:26px;height:26px;border-radius:50%;border:1.5px solid var(--line);display:flex;align-items:center;justify-content:center;font-size:12.5px;font-weight:800;color:var(--dim)}
.choice.sel{border-color:var(--accent);background:var(--tint)}
.choice.sel .cl{background:var(--accent);border-color:var(--accent);color:#fff}
.choice.correct{border-color:var(--green);background:rgba(47,158,105,.08)}
.choice.correct .cl{background:var(--green);border-color:var(--green);color:#fff}
.choice.wrong{border-color:var(--red);background:rgba(207,46,46,.07)}
.choice.wrong .cl{background:var(--red);border-color:var(--red);color:#fff}
.choice.struck{opacity:.4}
.choice.struck .ct{text-decoration:line-through}
.choice .strike{margin-left:auto;flex-shrink:0;border:none;background:none;color:var(--muted);cursor:pointer;font-size:13px;padding:2px 5px;border-radius:6px}
.choice .strike:hover{background:var(--tint);color:var(--text)}
.sprbox{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.sprbox input{font-size:17px;padding:11px 14px;border:1.5px solid var(--line);border-radius:10px;background:var(--panel2);color:var(--text);width:170px;font-family:inherit}
.sprbox input:focus{outline:none;border-color:var(--accent)}
.explain{margin-top:16px;border-left:3px solid var(--accent);background:var(--tint);border-radius:0 10px 10px 0;padding:12px 16px;font-size:14px;line-height:1.6;color:var(--text)}
.explain b{color:var(--accent)}
.run-foot{display:flex;gap:10px;margin-top:18px;align-items:center;flex-wrap:wrap}
.flagbtn{border:1px solid var(--line);background:var(--panel2);border-radius:9px;padding:8px 13px;font-size:13px;cursor:pointer;color:var(--dim);font-weight:600}
.flagbtn.on{color:var(--amber);border-color:var(--amber)}
.palette{display:flex;gap:6px;flex-wrap:wrap;margin-top:14px}
.palette button{width:34px;height:34px;border-radius:8px;border:1px solid var(--line);background:var(--panel2);font-size:12px;font-weight:700;color:var(--dim);cursor:pointer;position:relative}
.palette button.done{background:var(--navy);color:#fff;border-color:var(--navy)}
html.theme-dark .palette button.done{background:var(--accent);border-color:var(--accent)}
.palette button.cur{outline:2px solid var(--accent);outline-offset:1px}
.palette button.flag::after{content:"⚑";position:absolute;top:-7px;right:-4px;font-size:10px;color:var(--amber)}
.modbreak{text-align:center;padding:46px 20px}
.modbreak h2{font-size:26px;margin:0 0 10px}
.bigscore{font-size:56px;font-weight:800;color:var(--accent);line-height:1}
.scorecard{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:20px 0}
@media(max-width:600px){.scorecard{grid-template-columns:1fr}}
.scorebox{background:var(--tint);border-radius:12px;padding:18px;text-align:center}
.scorebox .lab{font-size:11.5px;letter-spacing:1.4px;text-transform:uppercase;color:var(--muted);font-weight:800}
.scorebox .val{font-size:34px;font-weight:800;font-family:"Syne","Segoe UI",sans-serif;margin-top:4px}
.rangenote{font-size:12px;color:var(--muted);margin-top:4px}
.review-list{display:flex;flex-direction:column;gap:10px;margin-top:14px}
.rev-item{border:1px solid var(--line);border-radius:11px;padding:13px 15px;background:var(--panel2);cursor:pointer}
.rev-item .rr{display:flex;gap:10px;align-items:center;font-size:13.5px}
.rev-item .ok{color:var(--green);font-weight:800}
.rev-item .no{color:var(--red);font-weight:800}
.rev-item .skp{color:var(--amber);font-weight:800}
.rev-detail{margin-top:10px;font-size:13.5px;line-height:1.6;color:var(--dim);display:none}
.rev-item.open .rev-detail{display:block}

/* streak / confetti-ish feedback */
.streakpop{position:fixed;left:50%;top:18%;transform:translate(-50%,0) scale(1);font-size:30px;font-weight:800;color:var(--accent);z-index:600;pointer-events:none;font-family:"Syne",sans-serif;text-shadow:0 2px 12px rgba(0,0,0,.18);animation:pop .9s ease-out forwards}
@keyframes pop{0%{transform:translate(-50%,8px) scale(.6);opacity:0}25%{transform:translate(-50%,0) scale(1.15);opacity:1}70%{transform:translate(-50%,-6px) scale(1);opacity:1}100%{transform:translate(-50%,-22px) scale(.95);opacity:0}}

/* ---------- lessons ---------- */
.lesson-shell{max-width:780px;margin:0 auto}
.slide{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:28px;box-shadow:var(--shadow);min-height:340px;display:flex;flex-direction:column}
.slide h2{margin:0 0 12px;font-size:24px}
.slide .body{font-size:15.5px;line-height:1.7;color:var(--text)}
.slide .body p{margin:0 0 12px}
.slide .fig{margin:16px auto 6px;text-align:center;max-width:100%;overflow-x:auto}
.slide .fig svg{max-width:100%;height:auto}
.slidedots{display:flex;gap:7px;justify-content:center;margin:16px 0 4px}
.slidedots i{width:9px;height:9px;border-radius:50%;background:var(--line);cursor:pointer}
.slidedots i.on{background:var(--accent)}
.callout{background:var(--tint);border-left:3px solid var(--accent);border-radius:0 10px 10px 0;padding:11px 15px;margin:12px 0;font-size:14px;line-height:1.6}
.kbd{display:inline-block;background:var(--tint);border:1px solid var(--line);border-radius:6px;padding:1px 8px;font-size:13px;font-weight:700;font-family:Consolas,monospace}

/* ---------- arcade / games ---------- */
.gamewrap{max-width:860px;margin:0 auto}
.gamehead{display:flex;align-items:center;gap:12px;margin-bottom:14px;flex-wrap:wrap}
.gamehead h2{margin:0;font-size:24px}
.scorehud{margin-left:auto;display:flex;gap:10px;align-items:center}
.hudbox{background:var(--tint);border-radius:10px;padding:7px 14px;font-size:13px;font-weight:700}
.hudbox b{color:var(--accent);font-size:17px;font-variant-numeric:tabular-nums}
.stage{background:var(--panel);border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow);overflow:hidden;position:relative}
.stage svg{display:block;width:100%;height:auto;touch-action:none;user-select:none}
.gtools{display:flex;gap:8px;padding:12px 14px;border-top:1px solid var(--line);flex-wrap:wrap;align-items:center;background:var(--panel2)}
.gtools .tb{border:1px solid var(--line);background:var(--panel);border-radius:9px;padding:7px 13px;font-size:13px;font-weight:700;cursor:pointer;color:var(--dim)}
.gtools .tb.on{border-color:var(--accent);color:var(--accent);background:var(--tint)}
.readout{display:flex;gap:14px;flex-wrap:wrap;padding:12px 16px;font-size:13.5px;background:var(--panel);border-top:1px solid var(--line)}
.readout b{font-variant-numeric:tabular-nums;color:var(--accent)}
.challenge{display:flex;align-items:center;gap:10px;padding:10px 16px;border-top:1px solid var(--line);font-size:14px;background:var(--panel)}
.challenge .chk{width:22px;height:22px;border-radius:50%;border:2px solid var(--line);display:inline-flex;align-items:center;justify-content:center;color:#fff;font-size:12px;flex-shrink:0}
.challenge.done .chk{background:var(--green);border-color:var(--green)}
.challenge.done .ct{color:var(--green);font-weight:700}
.slider-row{display:flex;align-items:center;gap:10px;font-size:13.5px;font-weight:700;flex:1;min-width:220px}
.slider-row input[type=range]{flex:1;accent-color:var(--accent)}
.slider-row .val{min-width:52px;text-align:right;font-variant-numeric:tabular-nums;color:var(--accent)}
.blitzbig{font-size:clamp(20px,3.5vw,27px);font-weight:700;text-align:center;padding:10px 20px;line-height:1.45}
.blitz-choices{display:grid;grid-template-columns:1fr 1fr;gap:10px;padding:0 20px 20px;max-width:620px;margin:0 auto}
@media(max-width:520px){.blitz-choices{grid-template-columns:1fr}}
.gameover{text-align:center;padding:40px 20px}
.gameover .big{font-size:52px;font-weight:800;color:var(--accent);font-family:"Syne",sans-serif}

/* theme + help fabs */
.fab{position:fixed;bottom:16px;z-index:300;display:inline-flex;align-items:center;gap:7px;background:var(--panel2);color:var(--text);border:1px solid var(--line);border-radius:22px;padding:9px 12px;font-size:13px;font-weight:700;cursor:pointer;box-shadow:var(--shadow)}
.fab:hover{border-color:var(--accent)}
.fab.right{right:16px}
.fab.left{left:16px}

/* modal */
.ov{position:fixed;inset:0;background:rgba(4,10,16,.55);z-index:500;display:none;align-items:center;justify-content:center;padding:20px}
.ov.show{display:flex}
.ovcard{background:var(--panel);border:1px solid var(--line);border-radius:16px;max-width:560px;width:100%;max-height:86vh;overflow:auto;padding:24px;box-shadow:0 20px 60px rgba(0,0,0,.3)}
.ovcard h2{margin:0 0 6px;font-size:21px}
.ovcard .hx{float:right;cursor:pointer;color:var(--muted);font-size:24px;line-height:1;border:none;background:none;font-weight:700}

/* quiz builder */
.pickgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:10px;margin:12px 0}
.pick{border:1.5px solid var(--line);border-radius:11px;padding:12px 14px;cursor:pointer;background:var(--panel2);font-size:13.5px;font-weight:600;display:flex;align-items:center;gap:9px;transition:.12s}
.pick:hover{border-color:var(--accent2)}
.pick.on{border-color:var(--accent);background:var(--tint)}
.pick .dot{width:10px;height:10px;border-radius:50%;background:var(--line);flex-shrink:0}
.pick.on .dot{background:var(--accent)}
.seg{display:inline-flex;border:1px solid var(--line);border-radius:10px;overflow:hidden}
.seg button{border:none;background:var(--panel2);padding:8px 16px;font-size:13px;font-weight:700;color:var(--dim);cursor:pointer}
.seg button.on{background:var(--accent);color:#fff}

@media(max-width:700px){
  .topbar{padding:8px 10px;gap:6px}
  .wordmark small{display:none}
  .navlink{padding:6px 8px;font-size:12px}
  .wrap{padding:20px 14px 70px}
  .qcard{padding:17px}
}

/* ===== v2: emphasis, formulas, locks, desktop scale, certificate, animations ===== */

/* referenced-word + blank emphasis in questions */
.refword{font-weight:800;font-size:1.14em;color:var(--accent)}
.blank{font-weight:800;font-size:1.06em;letter-spacing:1.5px;color:var(--accent)}

/* big formula chips (arcade) */
.formula{font-family:"Syne","Segoe UI",sans-serif;font-weight:800;font-size:clamp(19px,2.6vw,26px);padding:9px 18px;border-radius:13px;border:2px solid var(--line);background:var(--panel);color:var(--text);white-space:nowrap;font-variant-numeric:tabular-nums;transition:.2s}
.formula small{font-size:.62em;color:var(--muted);font-weight:700}
.formula.glow{border-color:transparent;animation:rainbowGlow 1.4s linear infinite}
@keyframes rainbowGlow{
  0%{box-shadow:0 0 16px 3px #ff5f6d;border-color:#ff5f6d}
  25%{box-shadow:0 0 20px 4px #ffc94d;border-color:#ffc94d}
  50%{box-shadow:0 0 20px 4px #47d97a;border-color:#47d97a}
  75%{box-shadow:0 0 20px 4px #4aa8ff;border-color:#4aa8ff}
  100%{box-shadow:0 0 16px 3px #ff5f6d;border-color:#ff5f6d}
}
.formula-stack{display:flex;flex-direction:column;gap:8px;align-items:flex-start;padding:14px 18px}
.formula-stack .formula{font-size:clamp(17px,2.2vw,23px)}
.numin{display:inline-flex;align-items:center;border:2px solid var(--accent);border-radius:10px;overflow:hidden;vertical-align:middle;background:var(--panel2)}
.numin input{width:74px;border:none;background:transparent;color:var(--accent);font-family:"Syne","Segoe UI",sans-serif;font-weight:800;font-size:22px;text-align:center;padding:4px 2px;font-variant-numeric:tabular-nums}
.numin input:focus{outline:none;background:var(--tint)}
.numin .spin{display:flex;flex-direction:column;border-left:1px solid var(--line)}
.numin .spin button{border:none;background:var(--panel);color:var(--dim);font-size:11px;line-height:1;padding:5px 7px;cursor:pointer}
.numin .spin button:hover{color:var(--accent);background:var(--tint)}
.kbd-hint{font-size:11.5px;color:var(--muted);line-height:1.6}

/* locked (demo) lesson cards */
.card.locked{position:relative;overflow:hidden}
.card.locked::after{content:"";position:absolute;inset:0;background:repeating-linear-gradient(-45deg,transparent 0 14px,rgba(11,31,51,.035) 14px 28px);pointer-events:none}
.lockchip{display:inline-flex;align-items:center;gap:6px;font-size:11px;font-weight:800;padding:4px 11px;border-radius:20px;background:var(--navy);color:#fff;letter-spacing:.4px}
html.theme-dark .lockchip{background:#3a3d45}
.lockchip .lk{font-size:12px}

/* question figures + entrance animation */
.qfig{margin:4px 0 16px;text-align:center;overflow-x:auto}
.qfig svg{max-width:100%;height:auto}
.qcard{animation:cardIn .32s ease}
@keyframes cardIn{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}
.explain{animation:cardIn .28s ease}
.choice.correct{animation:okPulse .45s ease}
@keyframes okPulse{0%{transform:scale(1)}35%{transform:scale(1.02)}100%{transform:scale(1)}}
.choice.wrong{animation:noShake .4s ease}
@keyframes noShake{0%,100%{transform:translateX(0)}25%{transform:translateX(-5px)}60%{transform:translateX(4px)}}

/* progress charts */
.sparkbox{overflow-x:auto}
.sparkbox svg{display:block;max-width:100%}
.statgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:12px;margin-top:12px}
.statbox{background:var(--tint);border-radius:12px;padding:14px;text-align:center}
.statbox b{display:block;font-size:26px;font-family:"Syne","Segoe UI",sans-serif;color:var(--accent)}
.statbox span{font-size:12px;color:var(--dim)}

/* certificate */
.certwrap{max-width:820px;margin:0 auto}
.certificate{background:var(--panel);border:3px double var(--accent);border-radius:14px;padding:44px 40px;text-align:center;box-shadow:var(--shadow);position:relative}
.certificate .cspec{display:flex;gap:5px;justify-content:center;margin-bottom:14px}
.certificate .cspec i{width:12px;height:12px;border-radius:50%}
.certificate h2{font-size:15px;letter-spacing:4px;text-transform:uppercase;color:var(--muted);margin:0 0 4px;font-weight:800}
.certificate .cname{font-family:"Syne","Segoe UI",sans-serif;font-size:clamp(28px,5vw,42px);font-weight:800;color:var(--accent);margin:14px 0 6px}
.certificate .cline{width:60%;margin:0 auto;border-bottom:1px solid var(--line)}
.certificate .cbody{font-size:15px;color:var(--dim);line-height:1.7;max-width:520px;margin:14px auto}
.certificate .cscore{font-family:"Syne","Segoe UI",sans-serif;font-size:34px;font-weight:800;color:var(--text)}
.certificate .cfoot{display:flex;justify-content:space-between;margin-top:36px;font-size:12.5px;color:var(--muted)}
.certificate .csig{border-top:1px solid var(--line);padding-top:6px;min-width:170px}
@media print{
  body *{visibility:hidden}
  .certificate,.certificate *{visibility:visible}
  .certificate{position:fixed;inset:24px;border-color:#b3122b;box-shadow:none}
  .topbar,.fab,.nav{display:none}
}

/* parents view */
.parentcard{border-left:4px solid var(--accent)}
.parentcard h4{margin:0 0 6px;font-size:17px}
.parentcard .pc-act{background:var(--tint);border-radius:10px;padding:11px 14px;margin-top:10px;font-size:13.5px;line-height:1.6}

/* desktop scale-up (mobile/tablet unchanged) */
@media(min-width:1150px){
  .wrap{max-width:1280px;padding:34px 28px 90px}
  h1{font-size:clamp(38px,4vw,54px)}
  .sub{font-size:17px;max-width:780px}
  .runner{max-width:960px}
  .qcard{padding:32px 36px}
  .qpassage{font-size:16.5px}
  .qprompt{font-size:17px}
  .choice{font-size:15.5px;padding:14px 17px}
  .lesson-shell{max-width:920px}
  .slide{min-height:430px;padding:36px 42px}
  .slide h2{font-size:28px}
  .slide .body{font-size:17px}
  .gamewrap{max-width:1020px}
  .card h3{font-size:21px}
  .feature .fl{padding:32px 36px}
}
@media(max-width:560px){
  .certificate{padding:26px 16px}
  .certificate .cfoot{flex-direction:column;gap:14px;align-items:center}
  .certificate .csig{min-width:0;width:70%;text-align:center}
}

/* ===== v3: standard readable fonts for math content; EST label ===== */
/* Math problems, formulas, and editable numbers use the plain test-like stack, never display fonts */
.formula, .formula-stack .formula, .numin input{
  font-family:"Segoe UI",Roboto,Arial,sans-serif;
  font-variant-numeric:tabular-nums lining-nums;
}
.formula{font-weight:700;letter-spacing:.2px}
.numin input{font-weight:700}
.estlab{font-size:.38em;font-weight:800;color:var(--muted);letter-spacing:1.6px;vertical-align:middle;margin-right:2px;font-family:"Segoe UI",Roboto,Arial,sans-serif}

/* ===== v4: ghost goal previews ===== */
.ghostline{animation:ghostFade 2.6s ease forwards}
@keyframes ghostFade{0%{opacity:0}12%{opacity:.32}75%{opacity:.32}100%{opacity:0}}
.eyebtn{border:1px solid var(--line);background:var(--panel);border-radius:9px;padding:7px 12px;font-size:13px;font-weight:700;cursor:pointer;color:var(--dim)}
.eyebtn:hover{border-color:var(--accent);color:var(--accent)}
.ghosttog{display:inline-flex;align-items:center;gap:7px;font-size:12.5px;font-weight:700;color:var(--dim);cursor:pointer;user-select:none}
.ghosttog input{accent-color:var(--accent);width:15px;height:15px;cursor:pointer}
.challenge .peek{margin-left:auto;flex-shrink:0}

/* ===== v6: ACT, test tools, planner, captions, interactives ===== */

/* instructions / briefing panels */
.instr{max-width:760px;margin:0 auto}
.ih{margin:18px 0 6px;font-size:13px;letter-spacing:1.1px;text-transform:uppercase;color:var(--accent);font-weight:800}
.ilist{margin:0;padding-left:20px;font-size:14.5px;line-height:1.75;color:var(--text)}
.ilist li{margin-bottom:7px}
.ilist b{color:var(--text)}

/* test tool row */
.toolrow{display:flex;align-items:center;gap:9px;flex-wrap:wrap;padding:8px 2px 10px}
.toolhint{font-size:12px;color:var(--muted)}
.toolbtn{border:1px solid var(--line);background:var(--panel);border-radius:8px;padding:6px 11px;font-size:12.5px;font-weight:700;color:var(--dim);cursor:pointer}
.toolbtn:hover{border-color:var(--accent);color:var(--accent)}
.toolbtn.on{border-color:var(--accent);color:var(--accent);background:var(--tint)}

/* highlights + annotations */
mark.hl{padding:1px 0;border-radius:3px;cursor:pointer;background:rgba(242,193,78,.55);color:inherit}
mark.hl.b{background:rgba(91,155,216,.42)}
mark.hl.p{background:rgba(224,69,123,.34)}
html.theme-dark mark.hl{background:rgba(242,193,78,.34)}
html.theme-dark mark.hl.b{background:rgba(91,155,216,.36)}
html.theme-dark mark.hl.p{background:rgba(224,69,123,.32)}
mark.hl.noted{box-shadow:inset 0 -2px 0 var(--accent)}
mark.hl.noted::after{content:"✎";font-size:10px;vertical-align:super;color:var(--accent);margin-left:1px}
.hl-bar{position:absolute;z-index:600;display:none;align-items:center;gap:5px;background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:5px 7px;box-shadow:0 8px 26px rgba(0,0,0,.24)}
.hl-bar .hlc{width:20px;height:20px;border-radius:50%;border:1.5px solid var(--line);cursor:pointer;padding:0}
.hl-bar .hlc.y{background:#f2c14e}.hl-bar .hlc.b{background:#5b9bd8}.hl-bar .hlc.p{background:#e0457b}
.hl-bar .hlbtn{border:none;background:none;font-size:12.5px;font-weight:700;color:var(--dim);cursor:pointer;padding:3px 7px;border-radius:7px}
.hl-bar .hlbtn:hover{background:var(--tint);color:var(--text)}

/* line reader */
.line-reader{position:fixed;inset:0;z-index:250;pointer-events:none;display:none}
.line-reader .lr-top{background:rgba(10,16,24,.42);height:200px}
.line-reader .lr-slot{height:46px}
.line-reader .lr-bot{background:rgba(10,16,24,.42);position:absolute;left:0;right:0;bottom:0;top:auto;height:100%}
html.theme-dark .line-reader .lr-top,html.theme-dark .line-reader .lr-bot{background:rgba(0,0,0,.55)}

/* reference sheet */
.refgrid{display:flex;flex-direction:column;gap:2px}
.refrow{display:grid;grid-template-columns:150px 1fr 1fr;gap:10px;padding:8px 0;border-bottom:1px dashed var(--line);font-size:13.5px;align-items:baseline}
.refrow b{font-size:13px}
.refrow span{font-family:"Segoe UI",Roboto,Arial,sans-serif;font-variant-numeric:tabular-nums;color:var(--dim)}
@media(max-width:560px){.refrow{grid-template-columns:1fr;gap:2px}}

/* ACT English underlined portion + reading genre tag */
.uline{text-decoration:underline;text-decoration-thickness:2px;text-underline-offset:3px;text-decoration-color:var(--accent);font-weight:600}
.genretag{display:inline-block;font-size:10.5px;font-weight:800;letter-spacing:1.2px;text-transform:uppercase;color:var(--muted);border:1px solid var(--line);border-radius:20px;padding:3px 10px;margin-bottom:10px}

/* planner */
.plancard.hot{border-left:4px solid var(--red)}
.plancard.warm{border-left:4px solid var(--amber)}
.plancard.cool{border-left:4px solid var(--green)}
.plancard.past{border-left:4px solid var(--muted)}
.daysbig{font-family:"Syne","Segoe UI",sans-serif;font-size:40px;font-weight:800;color:var(--accent);line-height:1;text-align:center}
.daysbig span{display:block;font-size:11px;letter-spacing:1.6px;text-transform:uppercase;color:var(--muted);font-family:"Segoe UI",sans-serif}
.opprow{display:grid;grid-template-columns:170px 1fr 130px;gap:12px;align-items:center;padding:7px 0}
.opprow .opdn{font-size:13.5px;font-weight:600}
.opprow .opdp{font-size:12.5px;text-align:right;color:var(--dim)}
@media(max-width:600px){.opprow{grid-template-columns:120px 1fr 92px}.opprow .opdn{font-size:12px}}
.phaselist{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:10px}
.phase{background:var(--tint);border-radius:11px;padding:13px 15px;border-top:3px solid var(--accent)}
.phase.p1{border-top-color:var(--amber)}.phase.p2{border-top-color:var(--blue)}.phase.p3{border-top-color:var(--green)}
.phase .ptop{display:flex;justify-content:space-between;align-items:baseline;gap:8px;margin-bottom:5px}
.phase .pgoal{font-size:13px;line-height:1.55;color:var(--dim)}
.phase .pdo{margin-top:8px;font-size:12.5px;color:var(--text)}

/* official links */
.offrow{display:flex;align-items:center;gap:11px;padding:11px 4px;border-bottom:1px dashed var(--line);text-decoration:none;color:var(--text);font-size:14px}
.offrow:last-child{border-bottom:none}
.offrow:hover{color:var(--accent)}
.offrow .offi{color:var(--accent);font-weight:800}
.exlink{color:var(--accent);font-weight:700;text-decoration:none}
.exlink:hover{text-decoration:underline}

/* ===== lesson closed captions + watch mode ===== */
.ccbar{position:sticky;bottom:0;z-index:60;margin-top:14px;background:var(--navy);border-radius:14px;padding:16px 18px;box-shadow:0 10px 30px rgba(0,0,0,.22)}
html.theme-dark .ccbar{background:#0c0d10;border:1px solid var(--line)}
.cctext{color:#fff;font-size:clamp(15px,2.3vw,19px);line-height:1.5;text-align:center;min-height:2.6em;display:flex;align-items:center;justify-content:center;font-weight:600}
.ccctrl{display:flex;align-items:center;gap:8px;justify-content:center;margin-top:11px;flex-wrap:wrap}
.ccbtn{border:1px solid rgba(255,255,255,.24);background:rgba(255,255,255,.08);color:#fff;border-radius:9px;padding:7px 13px;font-size:13px;font-weight:700;cursor:pointer}
.ccbtn:hover{background:rgba(255,255,255,.18)}
.ccbtn.on{background:var(--accent);border-color:var(--accent)}
.ccprog{height:4px;background:rgba(255,255,255,.18);border-radius:3px;overflow:hidden;margin-top:10px}
.ccprog i{display:block;height:100%;background:var(--accent);transition:width .25s linear}
.ccmeta{color:rgba(255,255,255,.6);font-size:11.5px;text-align:center;margin-top:7px;letter-spacing:.4px}

/* ===== in-lesson interactives ===== */
.ilab{background:var(--tint);border:1px solid var(--line);border-radius:14px;padding:16px 18px;margin:14px 0}
.ilab h4{margin:0 0 4px;font-size:14.5px}
.ilab .ihint{font-size:12.5px;color:var(--muted);margin:0 0 12px}
.ilab .ibig{font-family:"Segoe UI",Roboto,Arial,sans-serif;font-variant-numeric:tabular-nums;font-size:clamp(19px,3vw,25px);font-weight:800;color:var(--accent);text-align:center;padding:8px 0}
.ilab .irow{display:flex;align-items:center;gap:10px;flex-wrap:wrap;font-size:13.5px;font-weight:700}
.ilab input[type=range]{flex:1;min-width:150px;accent-color:var(--accent)}
.sortbin{display:grid;grid-template-columns:repeat(3,1fr);gap:9px;margin-top:10px}
@media(max-width:560px){.sortbin{grid-template-columns:1fr}}
.sortbin .bin{border:1.5px dashed var(--line);border-radius:11px;padding:10px;min-height:66px;text-align:center}
.sortbin .bin b{display:block;font-size:12px;letter-spacing:1px;text-transform:uppercase;color:var(--muted);margin-bottom:6px}
.sortbin .bin.ok{border-color:var(--green);border-style:solid;background:rgba(47,158,105,.08)}
.chipset{display:flex;flex-wrap:wrap;gap:7px;margin-top:10px;justify-content:center}
.chip{border:1.5px solid var(--line);background:var(--panel);border-radius:20px;padding:6px 13px;font-size:13.5px;font-weight:700;cursor:pointer}
.chip:hover{border-color:var(--accent)}
.chip.sel{border-color:var(--accent);background:var(--accent);color:#fff}
.chip.placed{opacity:.35;pointer-events:none}
.revealgrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:9px;margin-top:10px}
.revealcard{border:1.5px solid var(--line);border-radius:11px;padding:13px;cursor:pointer;background:var(--panel);text-align:center;font-size:13.5px;font-weight:700;min-height:74px;display:flex;align-items:center;justify-content:center;transition:.15s}
.revealcard:hover{border-color:var(--accent)}
.revealcard.open{background:var(--tint);border-color:var(--green);font-weight:600;font-size:12.5px;color:var(--dim)}
.spotter{font-size:15.5px;line-height:2.1}
.spotword{border-bottom:2px dotted var(--muted);cursor:pointer;padding:1px 2px;border-radius:3px}
.spotword:hover{background:var(--tint)}
.spotword.hit{background:rgba(47,158,105,.22);border-bottom-color:var(--green)}
.spotword.miss{background:rgba(207,46,46,.18);border-bottom-color:var(--red)}
.ifeedback{margin-top:11px;font-size:13.5px;font-weight:700;min-height:1.4em}
.ifeedback.good{color:var(--green)}
.ifeedback.bad{color:var(--red)}

/* ===== v6 fixes: three-way exam toggle, caption spacing, denser nav ===== */
.examtog{flex-shrink:0}
.examtog button{padding:6px 11px;font-size:12px}
.topbar .nav{row-gap:4px}
.topbar .navlink{padding:6px 9px;font-size:12.5px}
@media(min-width:1150px){.topbar .navlink{padding:7px 11px;font-size:13px}}
.lesson-shell{padding-bottom:24px}
.ccbar{margin-bottom:6px}
@media(max-width:700px){
  .ccbar{padding:12px 13px;border-radius:12px}
  .cctext{font-size:14.5px;min-height:2.4em}
  .ccbtn{padding:6px 10px;font-size:12px}
}

/* ===================================================================
   v7 THEMES: neon (dark, electric) and colorful (bright, playful).
   Light stays the default. Every token below is overridden so SVG
   figures, games, charts and captions all follow the theme.
   =================================================================== */

/* ---------------- NEON ---------------- */
html.theme-neon{
  --ink:#05060f; --panel:#0d0f22; --panel2:#141733; --line:#2a2f57;
  --text:#eaf6ff; --dim:#9db0dc; --muted:#6c7aa8; --tint:#171b3a;
  --accent:#ff3ec8; --accent2:#00e5ff; --gold:#ffe14d; --navy:#0a0c1c;
  --green:#39ff9e; --amber:#ffc43d; --red:#ff4d6d; --blue:#4dd2ff;
  --shadow:0 10px 34px rgba(0,0,0,.65);
}
html.theme-neon body{background:radial-gradient(1200px 620px at 74% -14%,#1a0f3d 0%,#0a0a1c 45%,#05060f 100%) fixed}
html.theme-neon .topbar{border-bottom-color:#2a2f57;box-shadow:0 1px 0 rgba(255,62,200,.28)}
html.theme-neon h1,html.theme-neon .bigscore,html.theme-neon .daysbig{text-shadow:0 0 18px rgba(255,62,200,.45)}
html.theme-neon h1 .hl{color:var(--accent2);text-shadow:0 0 20px rgba(0,229,255,.5)}
html.theme-neon .kicker{color:var(--accent2);text-shadow:0 0 12px rgba(0,229,255,.35)}
html.theme-neon .btn.primary{background:linear-gradient(135deg,#ff3ec8,#a12bff);box-shadow:0 0 20px rgba(255,62,200,.45)}
html.theme-neon .btn.primary:hover{box-shadow:0 0 28px rgba(255,62,200,.7)}
html.theme-neon .btn.dark{background:#141733;border:1px solid #00e5ff;color:#00e5ff;box-shadow:0 0 14px rgba(0,229,255,.3)}
html.theme-neon .btn.ghost:hover{border-color:var(--accent2);color:var(--accent2);box-shadow:0 0 14px rgba(0,229,255,.25)}
html.theme-neon .navlink.on{color:var(--accent2);background:rgba(0,229,255,.10);border-color:rgba(0,229,255,.45)}
html.theme-neon .navlink.cta{background:linear-gradient(135deg,#ff3ec8,#a12bff);box-shadow:0 0 16px rgba(255,62,200,.4)}
html.theme-neon .examtog{background:#0d0f22;border-color:#2a2f57}
html.theme-neon .examtog button.on{background:linear-gradient(135deg,#00e5ff,#3a86ff);color:#04121c;box-shadow:0 0 16px rgba(0,229,255,.55)}
html.theme-neon .card{background:linear-gradient(180deg,#0f1228,#0b0d1e);border-color:#242a4d}
html.theme-neon .card:hover{border-color:var(--accent2);box-shadow:0 0 26px rgba(0,229,255,.28)}
html.theme-neon .panel{background:linear-gradient(180deg,#0f1228,#0c0e20);border-color:#242a4d}
html.theme-neon .feature{background:linear-gradient(150deg,#1a1040,#0c0e22);border-color:#3a2a6b}
html.theme-neon .feature .fr{background:rgba(0,229,255,.05);border-left-color:#2a2f57}
html.theme-neon .fstat b{color:var(--accent2);text-shadow:0 0 12px rgba(0,229,255,.45)}
html.theme-neon .tagi{background:#171b3a;color:#9db0dc}
html.theme-neon .tagi.rw{background:rgba(77,210,255,.14);color:#7fe4ff}
html.theme-neon .tagi.math{background:rgba(57,255,158,.13);color:#5cffb8}
html.theme-neon .tagi.fun{background:rgba(255,62,200,.15);color:#ff8ade}
html.theme-neon .tagi.start{background:rgba(255,225,77,.13);color:#ffe98a}
html.theme-neon .pill.good{background:rgba(57,255,158,.14);color:#5cffb8}
html.theme-neon .pill.mid{background:rgba(255,196,61,.14);color:#ffd77a}
html.theme-neon .pill.low{background:rgba(255,77,109,.15);color:#ff8ba1}
html.theme-neon .lockchip{background:linear-gradient(135deg,#a12bff,#ff3ec8);color:#fff}
html.theme-neon .bar{background:#171b3a}
html.theme-neon .bar i{box-shadow:0 0 12px currentColor}
html.theme-neon .bar i.g{background:var(--green)}html.theme-neon .bar i.a{background:var(--amber)}
html.theme-neon .bar i.r{background:var(--red)}html.theme-neon .bar i.b{background:var(--blue)}
html.theme-neon .choice{background:#0f1228;border-color:#242a4d}
html.theme-neon .choice:hover{border-color:var(--accent2);box-shadow:0 0 16px rgba(0,229,255,.22)}
html.theme-neon .choice.sel{border-color:var(--accent);background:rgba(255,62,200,.12);box-shadow:0 0 18px rgba(255,62,200,.3)}
html.theme-neon .choice.correct{border-color:var(--green);background:rgba(57,255,158,.12);box-shadow:0 0 18px rgba(57,255,158,.32)}
html.theme-neon .choice.wrong{border-color:var(--red);background:rgba(255,77,109,.12)}
html.theme-neon .qcard,html.theme-neon .slide,html.theme-neon .stage{background:linear-gradient(180deg,#0f1228,#0c0e20);border-color:#242a4d}
html.theme-neon .explain{background:rgba(0,229,255,.07);border-left-color:var(--accent2)}
html.theme-neon .callout{background:rgba(255,62,200,.08);border-left-color:var(--accent)}
html.theme-neon mark.hl{background:rgba(255,225,77,.32);color:#fff}
html.theme-neon mark.hl.b{background:rgba(0,229,255,.30)}
html.theme-neon mark.hl.p{background:rgba(255,62,200,.32)}
html.theme-neon .hl-bar{background:#0f1228;border-color:#2a2f57;box-shadow:0 0 24px rgba(0,229,255,.25)}
html.theme-neon .line-reader .lr-top,html.theme-neon .line-reader .lr-bot{background:rgba(0,0,0,.72)}
html.theme-neon .ccbar{background:linear-gradient(135deg,#16093a,#0a0c1e);border:1px solid #3a2a6b;box-shadow:0 0 30px rgba(255,62,200,.25)}
html.theme-neon .ccbtn.on{background:linear-gradient(135deg,#ff3ec8,#a12bff);border-color:transparent}
html.theme-neon .ccprog i{background:var(--accent2);box-shadow:0 0 10px var(--accent2)}
html.theme-neon .ilab{background:rgba(0,229,255,.05);border-color:#242a4d}
html.theme-neon .ilab .ibig{text-shadow:0 0 14px rgba(255,62,200,.4)}
html.theme-neon .chip{background:#0f1228;border-color:#2a2f57}
html.theme-neon .chip.sel{background:var(--accent);border-color:var(--accent);color:#fff;box-shadow:0 0 16px rgba(255,62,200,.5)}
html.theme-neon .revealcard{background:#0f1228}
html.theme-neon .statbox,html.theme-neon .scorebox,html.theme-neon .phase,html.theme-neon .hudbox{background:#171b3a}
html.theme-neon .certificate{background:#0d0f22;border-color:var(--accent)}
html.theme-neon .qtable th{background:#171b3a}
html.theme-neon .formula{background:#0f1228;border-color:#2a2f57}
html.theme-neon .toolbtn,html.theme-neon .eyebtn,html.theme-neon .gtools .tb{background:#0f1228;border-color:#2a2f57}
html.theme-neon .numin{background:#0f1228}
html.theme-neon .theme-fab,html.theme-neon .fab{background:#0f1228;border-color:#2a2f57;box-shadow:0 0 18px rgba(255,62,200,.28)}
html.theme-neon .uline{text-decoration-color:var(--accent2)}
html.theme-neon .blank,html.theme-neon .refword{color:var(--accent2)}

/* ---------------- COLORFUL ---------------- */
html.theme-colorful{
  --ink:#fdf2ff; --panel:#ffffff; --panel2:#fffaff; --line:#f0d9f7;
  --text:#2c1250; --dim:#6b4a86; --muted:#9a7fb0; --tint:#fbeeff;
  --accent:#7b2ff7; --accent2:#ff3d81; --gold:#ff9f1c; --navy:#4b1d95;
  --green:#06c48a; --amber:#ffa61c; --red:#ef476f; --blue:#2f7bff;
  --shadow:0 10px 30px rgba(123,47,247,.16);
}
html.theme-colorful body{
  background:
    radial-gradient(760px 420px at 8% -6%,rgba(255,61,129,.20) 0%,rgba(255,61,129,0) 60%),
    radial-gradient(700px 420px at 92% -2%,rgba(47,123,255,.20) 0%,rgba(47,123,255,0) 60%),
    radial-gradient(760px 460px at 50% 105%,rgba(6,196,138,.18) 0%,rgba(6,196,138,0) 62%),
    linear-gradient(180deg,#fff6fd 0%,#f4f0ff 100%) fixed;
}
html.theme-colorful .topbar{background:rgba(255,255,255,.9);backdrop-filter:blur(8px);border-bottom:2px solid transparent;
  border-image:linear-gradient(90deg,#7b2ff7,#ff3d81,#ffa61c,#06c48a,#2f7bff) 1}
html.theme-colorful h1 .hl{background:linear-gradient(90deg,#7b2ff7,#ff3d81);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;color:var(--accent)}
html.theme-colorful .btn.primary{background:linear-gradient(135deg,#7b2ff7,#ff3d81);color:#fff}
html.theme-colorful .btn.dark{background:linear-gradient(135deg,#2f7bff,#06c48a);color:#fff}
html.theme-colorful .navlink.cta{background:linear-gradient(135deg,#7b2ff7,#ff3d81)}
html.theme-colorful .navlink.on{background:linear-gradient(135deg,rgba(123,47,247,.12),rgba(255,61,129,.12));border-color:rgba(123,47,247,.3)}
html.theme-colorful .examtog{background:#fbeeff;border-color:#f0d9f7}
html.theme-colorful .examtog button.on{background:linear-gradient(135deg,#7b2ff7,#ff3d81);color:#fff}
html.theme-colorful .feature{background:linear-gradient(150deg,#f3e9ff,#ffeef6);border-color:#e6d0f7}
html.theme-colorful .feature .fr{background:rgba(255,255,255,.65);border-left-color:#e6d0f7}
html.theme-colorful .tagi.rw{background:#e2ecff;color:#2f6ae0}
html.theme-colorful .tagi.math{background:#d8fbef;color:#04916a}
html.theme-colorful .tagi.fun{background:#ffe3ef;color:#d81f63}
html.theme-colorful .tagi.start{background:#fff0d6;color:#b4700a}
html.theme-colorful .pill.good{background:#d8fbef;color:#04916a}
html.theme-colorful .pill.mid{background:#fff0d6;color:#b4700a}
html.theme-colorful .pill.low{background:#ffe3ea;color:#cf2b53}
html.theme-colorful .lockchip{background:linear-gradient(135deg,#7b2ff7,#2f7bff)}
/* every card in a grid picks up its own accent stripe */
html.theme-colorful .grid > .card:nth-child(5n+1){border-top:4px solid #7b2ff7}
html.theme-colorful .grid > .card:nth-child(5n+2){border-top:4px solid #ff3d81}
html.theme-colorful .grid > .card:nth-child(5n+3){border-top:4px solid #ffa61c}
html.theme-colorful .grid > .card:nth-child(5n+4){border-top:4px solid #06c48a}
html.theme-colorful .grid > .card:nth-child(5n+5){border-top:4px solid #2f7bff}
html.theme-colorful .phaselist .phase:nth-child(4n+1){border-top-color:#7b2ff7}
html.theme-colorful .phaselist .phase:nth-child(4n+2){border-top-color:#ff3d81}
html.theme-colorful .phaselist .phase:nth-child(4n+3){border-top-color:#ffa61c}
html.theme-colorful .phaselist .phase:nth-child(4n+4){border-top-color:#06c48a}
html.theme-colorful .statgrid .statbox:nth-child(4n+1) b{color:#7b2ff7}
html.theme-colorful .statgrid .statbox:nth-child(4n+2) b{color:#ff3d81}
html.theme-colorful .statgrid .statbox:nth-child(4n+3) b{color:#ffa61c}
html.theme-colorful .statgrid .statbox:nth-child(4n+4) b{color:#06c48a}
html.theme-colorful .bigscore,html.theme-colorful .daysbig{background:linear-gradient(90deg,#7b2ff7,#ff3d81);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
html.theme-colorful .choice.sel{background:linear-gradient(135deg,rgba(123,47,247,.10),rgba(255,61,129,.10))}
html.theme-colorful .explain{background:linear-gradient(135deg,rgba(123,47,247,.08),rgba(255,61,129,.08))}
html.theme-colorful .callout{background:linear-gradient(135deg,rgba(47,123,255,.09),rgba(6,196,138,.09));border-left-color:#2f7bff}
html.theme-colorful mark.hl{background:rgba(255,214,10,.62)}
html.theme-colorful mark.hl.b{background:rgba(47,123,255,.32)}
html.theme-colorful mark.hl.p{background:rgba(255,61,129,.32)}
html.theme-colorful .ccbar{background:linear-gradient(135deg,#4b1d95,#7b2ff7 55%,#c2268f)}
html.theme-colorful .ccbtn.on{background:#ffa61c;border-color:#ffa61c;color:#3a1a00}
html.theme-colorful .ilab{background:linear-gradient(135deg,rgba(123,47,247,.06),rgba(255,166,28,.07));border-color:#eedbf8}
html.theme-colorful .chip.sel{background:linear-gradient(135deg,#7b2ff7,#ff3d81);border-color:transparent}
html.theme-colorful .qtable th{background:#f6ecff}
html.theme-colorful .certificate{border-color:#7b2ff7;background:linear-gradient(160deg,#fffdff,#fdf4ff)}
html.theme-colorful .spectrum i,html.theme-colorful .wordmark .spec i{box-shadow:0 0 0 2px rgba(255,255,255,.7)}

/* the certificate must print on white paper no matter the theme */
@media print{
  .certificate{background:#fff !important;color:#1c1d22 !important;border-color:#b3122b !important}
  .certificate *{color:#1c1d22 !important;-webkit-text-fill-color:#1c1d22 !important}
  .certificate .cname,.certificate .cscore{color:#b3122b !important;-webkit-text-fill-color:#b3122b !important}
}

/* ---------------- theme picker ---------------- */
.themepick{position:fixed;right:16px;bottom:62px;z-index:320;background:var(--panel);border:1px solid var(--line);
  border-radius:14px;padding:8px;box-shadow:var(--shadow);display:none;min-width:186px}
.themepick.show{display:block}
.themepick b{display:block;font-size:10.5px;letter-spacing:1.4px;text-transform:uppercase;color:var(--muted);padding:4px 8px 7px}
.themepick button{display:flex;align-items:center;gap:10px;width:100%;border:none;background:none;color:var(--text);
  font-size:13.5px;font-weight:700;padding:8px;border-radius:10px;cursor:pointer;text-align:left;font-family:inherit}
.themepick button:hover{background:var(--tint)}
.themepick button.on{background:var(--tint);color:var(--accent)}
.themepick .sw{width:34px;height:20px;border-radius:6px;flex-shrink:0;border:1px solid rgba(0,0,0,.12)}
.themepick .sw.light{background:linear-gradient(135deg,#ffffff 50%,#c1121f 50%)}
.themepick .sw.dark{background:linear-gradient(135deg,#1a1c20 50%,#e2444f 50%)}
.themepick .sw.neon{background:linear-gradient(135deg,#0d0f22 40%,#ff3ec8 70%,#00e5ff 100%)}
.themepick .sw.colorful{background:linear-gradient(90deg,#7b2ff7,#ff3d81,#ffa61c,#06c48a,#2f7bff)}

/* ===== Synonym Hunt (word search) ===== */
.ws-top{padding:16px 18px 10px}
.ws-target{display:flex;align-items:baseline;gap:10px;flex-wrap:wrap}
.ws-lab{font-size:11.5px;letter-spacing:1.4px;text-transform:uppercase;color:var(--muted);font-weight:800}
.ws-word{font-family:"Syne","Segoe UI",sans-serif;font-size:clamp(26px,5vw,38px);font-weight:800;color:var(--accent);line-height:1.1}
.ws-pos{font-size:13px;color:var(--muted);font-style:italic}
.peeknote{font-size:12px;font-weight:700;color:var(--amber);margin-left:8px;align-self:center}
.ws-timer{height:6px;background:var(--tint);border-radius:4px;overflow:hidden;margin:12px 0 8px}
.ws-timer i{display:block;height:100%;background:var(--green);border-radius:4px;transition:width .1s linear}
.ws-timer i.mid{background:var(--amber)}
/* The bar now tracks the optional definition bonus, not a fail clock, so its spent
   state is quiet rather than alarming. There is no red state any more. */
.ws-timer i.done{background:var(--line)}
.ws-bonus{font-size:12.5px;color:var(--muted);line-height:1.5;margin-bottom:6px}
.ws-bonus[data-state="over"]{color:var(--green)}
.ws-hint{font-size:12.5px;color:var(--muted);line-height:1.5}
.ws-gridwrap{display:flex;justify-content:center;padding:4px 12px 16px}
.ws-grid{display:grid;gap:3px;width:100%;max-width:440px;touch-action:none;user-select:none;-webkit-user-select:none}
.ws-cell{aspect-ratio:1;display:flex;align-items:center;justify-content:center;border:1px solid var(--line);
  background:var(--panel2);color:var(--text);border-radius:6px;cursor:pointer;padding:0;
  font-family:"Segoe UI",Roboto,Arial,sans-serif;font-weight:700;font-size:clamp(11px,2.4vw,16px);
  text-transform:uppercase;transition:background .08s,color .08s}
.ws-cell:hover{border-color:var(--accent2)}
.ws-cell.sel{background:var(--accent);color:#fff;border-color:var(--accent)}
.ws-cell.ok{background:var(--green);color:#fff;border-color:var(--green)}
.ws-cell.bad{background:var(--red);color:#fff;border-color:var(--red)}
.ws-cell.warn{background:var(--amber);color:#2b1b00;border-color:var(--amber)}
.ws-card{margin:0 14px 16px;border-radius:13px;padding:15px 17px;border-left:4px solid var(--line);background:var(--tint);animation:cardIn .28s ease}
.ws-card.good{border-left-color:var(--green)}
.ws-card.bad{border-left-color:var(--red)}
.ws-cardhead{font-size:16px;font-weight:800;margin-bottom:9px}
.ws-card.good .ws-cardhead{color:var(--green)}
.ws-card.bad .ws-cardhead{color:var(--red)}
.ws-fast{font-size:11px;font-weight:800;letter-spacing:.8px;text-transform:uppercase;background:var(--amber);color:#2b1b00;border-radius:20px;padding:2px 9px;margin-left:6px;vertical-align:middle}
.ws-def{background:var(--panel);border-radius:10px;padding:11px 13px;font-size:14.5px;line-height:1.6;margin-bottom:9px}
.ws-deflab{display:block;font-size:11px;letter-spacing:1.2px;text-transform:uppercase;color:var(--muted);font-weight:800;margin-bottom:3px}
.ws-ans{color:var(--green)}
.ws-note{font-size:13px;color:var(--dim);line-height:1.55;margin-bottom:11px}
.ws-why{font-size:13.5px;line-height:1.6;color:var(--dim);padding:7px 0;border-bottom:1px dashed var(--line)}
.ws-why:last-of-type{border-bottom:none}
.ws-why.lead{color:var(--text);font-size:14.5px;background:var(--panel);border-radius:10px;padding:11px 13px;border-bottom:none;margin-bottom:9px}
.ws-why b{color:var(--text)}
.ws-otherlab{font-size:11px;letter-spacing:1.2px;text-transform:uppercase;color:var(--muted);font-weight:800;margin:10px 0 2px}
@media(max-width:520px){
  .ws-card{margin:0 10px 12px;padding:13px 14px}
  .ws-grid{gap:2px}
  .ws-cell{border-radius:4px}
}
/* theme touches */
html.theme-neon .ws-cell{background:#0f1228;border-color:#242a4d}
html.theme-neon .ws-cell.sel{box-shadow:0 0 14px var(--accent)}
html.theme-neon .ws-cell.ok{box-shadow:0 0 14px var(--green)}
html.theme-neon .ws-word{text-shadow:0 0 18px rgba(255,62,200,.5)}
html.theme-neon .ws-def,html.theme-neon .ws-why.lead{background:#0b0d1e}
html.theme-colorful .ws-cell{background:#fffafd;border-color:#f0d9f7}
html.theme-colorful .ws-cell.sel{background:linear-gradient(135deg,#7b2ff7,#ff3d81);border-color:transparent}
html.theme-colorful .ws-word{background:linear-gradient(90deg,#7b2ff7,#ff3d81);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}

/* ===== mobile top bar: the nav grew to 8 links, so give it its own scrollable row ===== */
@media(max-width:820px){
  .topbar{flex-wrap:wrap;row-gap:7px;padding:8px 10px}
  .topbar .grow{display:none}
  .topbar .examtog{margin-left:auto}
  .topbar .nav{width:100%;flex-wrap:nowrap;overflow-x:auto;overflow-y:hidden;
    justify-content:flex-start;gap:4px;scrollbar-width:none;-ms-overflow-style:none;
    -webkit-overflow-scrolling:touch;padding-bottom:2px}
  .topbar .nav::-webkit-scrollbar{display:none}
  .topbar .navlink{flex-shrink:0;white-space:nowrap}
}

/* A signpost card, not a lesson: dashed so it never reads as real content. */
.card.ghost{background:none;border-style:dashed;box-shadow:none}
.card.ghost:hover{border-color:var(--accent);background:linear-gradient(180deg,var(--panel),var(--panel2))}

/* ================= floating test tools (calculator, scratch pad) ================= */
.fwin{position:fixed;display:flex;flex-direction:column;min-width:250px;min-height:190px;
  background:var(--panel);border:1px solid var(--line);border-radius:12px;
  box-shadow:0 18px 46px rgba(11,31,51,.24);overflow:hidden;touch-action:none}
html.theme-dark .fwin{box-shadow:0 18px 46px rgba(0,0,0,.55)}
.fwin-bar{display:flex;align-items:center;gap:8px;padding:8px 8px 8px 12px;cursor:grab;
  background:var(--panel2);border-bottom:1px solid var(--line);flex:none;user-select:none}
.fwin-bar:active{cursor:grabbing}
.fwin-t{font-weight:800;font-size:13px;letter-spacing:.2px;flex:1}
.fwin-x{border:0;background:none;font-size:20px;line-height:1;color:var(--dim);cursor:pointer;padding:0 4px}
.fwin-x:hover{color:var(--accent)}
.fwin-body{flex:1;min-height:0;overflow:auto;padding:10px;display:flex;flex-direction:column;gap:8px}
.fwin-grip{position:absolute;right:0;bottom:0;width:18px;height:18px;cursor:nwse-resize;
  background:linear-gradient(135deg,transparent 45%,var(--line) 45%,var(--line) 58%,transparent 58%,
  transparent 68%,var(--line) 68%,var(--line) 81%,transparent 81%)}
.fw-tabs{display:flex;align-items:center;gap:6px;flex:none}
.fw-tab{border:1px solid var(--line);background:var(--panel2);border-radius:8px;padding:5px 10px;
  font-size:12px;font-weight:700;color:var(--dim);cursor:pointer}
.fw-tab.on{border-color:var(--accent);color:var(--accent);background:var(--tint)}
.fw-mini{border:1px solid var(--line);background:var(--panel);border-radius:7px;padding:4px 9px;
  font-size:11.5px;font-weight:700;color:var(--dim);cursor:pointer}
.fw-mini:hover{border-color:var(--accent);color:var(--accent)}
.fw-mini.on{border-color:var(--accent);color:var(--accent);background:var(--tint)}
.fw-mini.warn:hover{border-color:#c0392b;color:#c0392b}
.fw-pane{display:flex;flex-direction:column;gap:8px;flex:1;min-height:0}
.fw-pane[hidden]{display:none}
.calc-in{width:100%;box-sizing:border-box;border:1px solid var(--line);border-radius:9px;
  padding:9px 11px;font-size:16px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;
  background:var(--panel2);color:var(--text);flex:none}
.calc-in:focus{outline:none;border-color:var(--accent)}
.calc-in.flat{flex:1;font-size:14px;padding:6px 9px;width:auto}
.calc-out{text-align:right;font-size:19px;font-weight:800;min-height:24px;
  font-family:ui-monospace,SFMono-Regular,Menlo,monospace;color:var(--accent);flex:none;
  overflow:hidden;text-overflow:ellipsis}
.calc-out.small{font-size:12px;font-weight:600;text-align:left;min-height:16px}
.calc-out.bad{color:var(--dim);font-weight:600;font-size:12.5px}
.calc-fns{display:flex;flex-wrap:wrap;gap:5px;flex:none}
.calc-f{border:1px solid var(--line);background:var(--panel2);border-radius:7px;padding:4px 8px;
  font-size:11.5px;font-weight:700;color:var(--dim);cursor:pointer}
.calc-f:hover{border-color:var(--accent);color:var(--accent)}
.calc-pad{display:grid;grid-template-columns:repeat(4,1fr);gap:5px;flex:none}
.calc-row{display:flex;gap:5px;align-items:center;flex:none}
.calc-k{border:1px solid var(--line);background:var(--panel2);border-radius:9px;padding:10px 0;
  font-size:15px;font-weight:700;color:var(--text);cursor:pointer}
.calc-k:hover{border-color:var(--accent)}
.calc-k.op{color:var(--accent)}
.calc-k.warn{color:#c0392b}
.calc-k.wide{flex:1}
.calc-k.eq{flex:2;background:var(--accent);color:#fff;border-color:var(--accent)}
.calc-y{font-weight:800;font-size:13px;color:var(--dim);flex:none}
.calc-rng{font-size:11px;color:var(--dim)}
#graphCv{border:1px solid var(--line);border-radius:9px;background:var(--panel2);flex:1;min-height:0}
.calc-hist{display:flex;flex-direction:column;gap:3px;overflow:auto;flex:1;min-height:0}
.calc-hmt{font-size:11.5px;color:var(--dim);padding:4px 2px}
.calc-h{display:flex;justify-content:space-between;gap:10px;border:0;background:none;cursor:pointer;
  padding:3px 4px;border-radius:6px;font-size:12px;color:var(--dim);text-align:left;width:100%}
.calc-h:hover{background:var(--tint)}
.calc-h span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;
  font-family:ui-monospace,SFMono-Regular,Menlo,monospace}
.calc-h b{color:var(--text);flex:none;font-family:ui-monospace,SFMono-Regular,Menlo,monospace}
.pad-bar{display:flex;align-items:center;gap:5px;flex-wrap:wrap;flex:none}
.pad-sep{width:1px;height:18px;background:var(--line)}
.pad-c{width:20px;height:20px;border-radius:50%;border:2px solid var(--line);cursor:pointer;padding:0}
.pad-c.on{border-color:var(--accent);transform:scale(1.14)}
.pad-c.ink{background:var(--text)}
.pad-c.accent{background:var(--accent)}
.pad-c.blue{background:var(--blue)}
.pad-c.green{background:#2f855a}
#padCv{border:1px solid var(--line);border-radius:9px;background:var(--panel2);
  flex:1;min-height:0;touch-action:none;cursor:crosshair}

/* ================= membership ================= */
.acct-badge{display:inline-flex;align-items:center;gap:5px;text-decoration:none;font-size:11.5px;
  font-weight:800;letter-spacing:.3px;text-transform:uppercase;padding:5px 10px;border-radius:20px;
  border:1px solid var(--line);color:var(--dim);background:var(--panel2);white-space:nowrap}
.acct-badge:hover{border-color:var(--accent);color:var(--accent)}
.acct-badge.member{border-color:var(--accent);color:#fff;background:var(--accent)}
.upg-list{margin:10px 0 12px;padding-left:20px;color:var(--dim);line-height:1.7;font-size:14px}
.upg-price{display:flex;align-items:baseline;gap:8px;margin-top:6px}
.upg-price b{font-size:30px;font-family:"Syne",sans-serif;color:var(--accent)}
.upg-price span{color:var(--dim);font-size:13.5px}
.upg-inline{margin-top:10px;padding:9px 12px;border:1px solid var(--line);border-left:3px solid var(--accent);
  border-radius:8px;background:var(--panel2);font-size:13px;color:var(--dim)}
.upg-inline a{color:var(--accent);font-weight:700}

/* pricing page */
.plans{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:18px;margin-top:20px}
.plan{border:1px solid var(--line);border-radius:var(--radius);padding:24px;background:var(--panel);
  box-shadow:var(--shadow);display:flex;flex-direction:column}
.plan.best{border:2px solid var(--accent);position:relative}
.plan .pl-tag{position:absolute;top:-11px;left:22px;background:var(--accent);color:#fff;font-size:11px;
  font-weight:800;letter-spacing:1px;text-transform:uppercase;padding:3px 10px;border-radius:20px}
.plan h3{margin:0 0 4px;font-size:21px}
.plan .pl-price{display:flex;align-items:baseline;gap:7px;margin:10px 0 4px}
.plan .pl-price b{font-size:38px;font-family:"Syne",sans-serif;line-height:1}
.plan .pl-price span{color:var(--dim);font-size:14px}
.plan ul{margin:14px 0 18px;padding-left:20px;color:var(--dim);line-height:1.75;font-size:14.5px;flex:1}
.plan ul li::marker{color:var(--accent)}
.seat-note{margin-top:10px;padding:12px 14px;border:1px dashed var(--line);border-radius:10px;
  font-size:13.5px;color:var(--dim)}
.footlinks{display:flex;flex-wrap:wrap;gap:14px;align-items:center;margin-top:10px}
.footlinks a{color:var(--muted);text-decoration:none;font-weight:700;font-size:13px}
.footlinks a:hover{color:var(--accent)}
.freechip,.memchip{display:inline-block;margin-left:8px;font-size:10.5px;font-weight:800;letter-spacing:.8px;
  text-transform:uppercase;padding:3px 8px;border-radius:20px;vertical-align:middle}
.freechip{background:var(--tint);color:var(--dim);border:1px solid var(--line)}
.memchip{background:var(--accent);color:#fff}

.ast{color:var(--accent);text-decoration:none;font-weight:800}
.ast:hover{text-decoration:underline}

.sprsaved{font-size:12.5px;font-weight:700;color:var(--green);opacity:0;transition:opacity .15s}
.sprsaved.on{opacity:1}

.lockchip.mem{background:var(--accent);color:#fff;border-color:var(--accent)}
.card.paywalled:hover{border-color:var(--accent)}