@import url('https://fonts.googleapis.com/css2?family=Kalam:wght@400;700&family=Nunito:wght@400;600;700;800&display=swap');
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:Nunito,Arial,sans-serif;background:#eef4ff;color:#263047;transition:background .25s,color .25s}
body.dark{background:#111725;color:#edf1ff}
header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.96);border-bottom:1px solid #dae3f1;padding:12px 4%;display:flex;justify-content:space-between;align-items:center;gap:10px;backdrop-filter:blur(10px);flex-wrap:wrap}
body.dark header{background:#1a2131;border-color:#30394e}
.brand{display:flex;gap:12px;align-items:center}
.logo{width:48px;height:48px;border-radius:15px;background:linear-gradient(135deg,#e4e8ff,#c8ceff);display:grid;place-items:center;font-size:25px;box-shadow:0 4px 12px rgba(91,97,223,.2)}
.brand h1{font-size:22px}.brand h1 span{color:#5b61df}.brand p{font-size:11px;color:#72809a}
.header-actions{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.btn{border:0;border-radius:11px;padding:10px 14px;font-weight:800;cursor:pointer;background:#5b61df;color:#fff;transition:transform .15s,box-shadow .15s;font-size:13px}
.btn:hover{transform:translateY(-2px);box-shadow:0 6px 16px rgba(91,97,223,.35)}
.btn.ghost{background:#ececff;color:#5058cb}
body.dark .btn.ghost{background:#2a3348;color:#a8aeff}
main{width:min(1220px,94%);margin:auto;padding:28px 0 65px}
.hero{display:grid;grid-template-columns:1.5fr .85fr;gap:25px;padding:42px;border-radius:30px;background:linear-gradient(135deg,#fffdf0,#e8efff);border:1px solid #dae3f1;box-shadow:0 18px 50px rgba(57,69,112,.1)}
body.dark .hero{background:linear-gradient(135deg,#20293b,#202846);border-color:#313b50}
.badge{display:inline-block;background:#fff09a;padding:7px 12px;border-radius:99px;font-size:11px;font-weight:800}
.hero h2{font-family:Kalam,cursive;color:#5057c9;font-size:56px;line-height:.98;margin:18px 0 12px}
body.dark .hero h2{color:#a8aeff}
.hero p{line-height:1.7;max-width:690px}
.search{margin-top:23px;display:flex;align-items:center;background:#fff;border-radius:14px;padding:5px 13px;max-width:650px;border:1px solid #dbe2ee}
body.dark .search{background:#171e2d;border-color:#303a50}
.search input{flex:1;border:0;outline:0;padding:12px;background:transparent;color:inherit;font-size:15px}
.heroCard{align-self:center;padding:25px;border-radius:22px;background:#fffdf8;border:1px solid #dde4ef;background-image:repeating-linear-gradient(0deg,rgba(80,95,170,.06),rgba(80,95,170,.06) 1px,transparent 1px,transparent 30px)}
body.dark .heroCard{background-color:#192131;border-color:#30394e}
.heroCard h3{font-family:Kalam,cursive;font-size:26px;color:#5057c9}
.progress{height:11px;background:#e1e5ee;border-radius:99px;overflow:hidden;margin:14px 0 7px}
.progress div{height:100%;width:0;background:linear-gradient(90deg,#5b61df,#8b91ff);transition:.4s}
.streak{display:inline-flex;align-items:center;gap:6px;margin-top:10px;background:#fff3d5;padding:6px 12px;border-radius:99px;font-size:12px;font-weight:800;color:#8a6a00}
body.dark .streak{background:#3a3420;color:#f0d78a}
.section{margin-top:45px}
.top{display:flex;justify-content:space-between;align-items:end;margin-bottom:17px;flex-wrap:wrap;gap:10px}
.eyebrow{font-size:10px;letter-spacing:2px;color:#5b61df;font-weight:900}
.top h2{font-size:29px;margin-top:4px}
.subjects{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.subject{background:#fffdf8;border:1px solid #dce4f0;border-radius:21px;padding:22px;cursor:pointer;box-shadow:0 11px 30px rgba(48,64,110,.07);transition:.2s;position:relative}
body.dark .subject{background:#1a2131;border-color:#30394e}
.subject:hover{transform:translateY(-5px);border-color:#747be2;box-shadow:0 16px 36px rgba(48,64,110,.12)}
.subjectIcon{width:58px;height:58px;border-radius:16px;background:#e8ebff;display:grid;place-items:center;font-size:30px;margin-bottom:14px}
body.dark .subjectIcon{background:#2a3348}
.subject h3{font-size:20px}.subject small{display:block;color:#77849b;margin:5px 0 10px;font-size:11px}.subject p{font-size:13px;color:#718098;line-height:1.55}
.pill{display:inline-block;margin-top:14px;background:#ececff;color:#5158cb;border-radius:99px;padding:6px 10px;font-size:11px;font-weight:900}
.subjProg{margin-top:12px;height:6px;background:#e1e5ee;border-radius:99px;overflow:hidden}
.subjProg div{height:100%;background:#5b61df;border-radius:99px;transition:.3s}
.dashboard{display:grid;grid-template-columns:1.1fr .9fr;gap:18px}
.panel{background:#fffdf8;border:1px solid #dce4f0;border-radius:21px;padding:23px;box-shadow:0 11px 30px rgba(48,64,110,.07)}
body.dark .panel{background:#1a2131;border-color:#30394e}
.big{margin:17px 0 10px;height:13px;background:#dfe4ed;border-radius:99px;overflow:hidden}.big div{height:100%;width:0;background:linear-gradient(90deg,#5b61df,#8b91ff);transition:.4s}
.mission{margin-top:10px;padding:13px;background:#eef1ff;border-radius:14px}body.dark .mission{background:#232b3f}
.subjBars{margin-top:14px;display:flex;flex-direction:column;gap:10px}
.subjBarRow{display:grid;grid-template-columns:90px 1fr 40px;gap:8px;align-items:center;font-size:12px}
.subjBarRow .bar{height:8px;background:#e1e5ee;border-radius:99px;overflow:hidden}
body.dark .subjBarRow .bar{background:#2a3348}
.subjBarRow .bar div{height:100%;background:#5b61df;border-radius:99px}
.modal{position:fixed;inset:0;z-index:100;background:rgba(12,18,32,.68);display:flex;justify-content:center;align-items:center;padding:17px;animation:fadeIn .2s}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}
.box{width:min(960px,100%);max-height:93vh;overflow:auto;position:relative;border-radius:25px;padding:30px;background:#fffef8;background-image:repeating-linear-gradient(0deg,rgba(80,95,170,.06),rgba(80,95,170,.06) 1px,transparent 1px,transparent 31px);color:#263047;animation:slideUp .25s}
@keyframes slideUp{from{transform:translateY(20px);opacity:0}to{transform:translateY(0);opacity:1}}
body.dark .box{background-color:#192131;color:#edf1ff}
.close{position:sticky;float:right;top:0;width:38px;height:38px;border:0;border-radius:50%;background:#eaedf5;font-size:19px;cursor:pointer;z-index:2}
body.dark .close{background:#2a3348;color:#edf1ff}
.back{border:0;background:#ececff;color:#5057ca;border-radius:10px;padding:9px 12px;font-weight:800;cursor:pointer}
body.dark .back{background:#2a3348;color:#a8aeff}
.hand{font-family:Kalam,cursive;color:#5158cb;font-size:38px;margin:10px 0}
.chapter{margin-top:12px;padding:16px;border:1px solid #d8dfeb;border-radius:16px;cursor:pointer;background:rgba(255,255,255,.5);transition:.15s;display:flex;justify-content:space-between;align-items:flex-start;gap:12px}
body.dark .chapter{background:rgba(255,255,255,.03);border-color:#344056}
.chapter:hover{border-color:#666ddf;transform:translateX(4px)}
.chapter h3{font-family:Kalam,cursive;font-size:22px;color:#4f56c6}.chapter p{margin-top:4px;color:#748199;line-height:1.55}
.chMeta{display:flex;gap:6px;align-items:center;flex-shrink:0}
.starBtn{border:0;background:transparent;font-size:20px;cursor:pointer;padding:4px;line-height:1}
.doneBadge{font-size:11px;background:#dff2d8;color:#317436;padding:4px 8px;border-radius:99px;font-weight:800}
body.dark .doneBadge{background:#243b2a;color:#bfe5c0}
.notes,.summary,.cheat,.keys{margin-top:18px;padding:21px;border-radius:17px;border:1px solid #dfe5ef}
.notes{background:#fffdf0}.summary{background:#eef2ff}.cheat{background:#fff3d5}.keys{background:#edf9e9}
body.dark .notes,body.dark .summary,body.dark .cheat,body.dark .keys{background:#222b3c;border-color:#344056}
.notes h3,.summary h3,.cheat h3,.keys h3{font-family:Kalam,cursive;color:#5057ca;font-size:25px;margin-bottom:9px}
.handnotes{font-family:Kalam,cursive;font-size:21px;line-height:1.65;white-space:pre-line}
.normal{line-height:1.7}
.kw{display:flex;gap:8px;flex-wrap:wrap}.kw span{background:#dff2d8;color:#317436;border-radius:99px;padding:7px 11px;font-size:12px;font-weight:900}
body.dark .kw span{background:#243b2a;color:#bfe5c0}
.cheat li{margin:8px 0;font-family:Kalam,cursive;font-size:19px}
.actions{display:flex;gap:9px;flex-wrap:wrap;margin-top:20px}
.primary,.secondary{border:0;border-radius:11px;padding:11px 15px;font-weight:900;cursor:pointer;transition:transform .12s}.primary{background:#5b61df;color:#fff}.secondary{background:#ececff;color:#5058cb}
body.dark .secondary{background:#2a3348;color:#a8aeff}
.primary:hover,.secondary:hover{transform:translateY(-2px)}
.navCh{display:flex;justify-content:space-between;gap:10px;margin-top:18px;flex-wrap:wrap}
.quizQ{margin-top:18px;font-size:20px;line-height:1.55;font-weight:800}
.option{display:block;width:100%;text-align:left;margin-top:9px;padding:13px;border:1px solid #dbe2ec;background:#f7f8fc;color:#263047;border-radius:12px;cursor:pointer;transition:.12s;font-size:15px}
body.dark .option{background:#232c3f;color:white;border-color:#3a455b}
.option:hover{border-color:#666ddf;transform:translateX(4px)}
.option.correct{background:#d4edda;border-color:#28a745;color:#155724}
.option.wrong{background:#f8d7da;border-color:#dc3545;color:#721c24}
body.dark .option.correct{background:#1e3d28;color:#bfe5c0}
body.dark .option.wrong{background:#3d1e22;color:#f5c2c7}
.result{margin-top:15px;padding:17px;border-radius:14px;background:#e9ecff;color:#5057cb;font-weight:900}
.timer{font-size:14px;font-weight:800;color:#5b61df;background:#ececff;padding:6px 12px;border-radius:99px;display:inline-block;margin-bottom:10px}
body.dark .timer{background:#2a3348;color:#a8aeff}
footer{text-align:center;padding:28px;color:#78849b;border-top:1px solid #dce3ef}
body.dark footer{border-color:#30394e}

.qaSection{margin-top:22px;padding:22px;border:2px solid #f0cf62;border-radius:18px;background:#fff9dd;box-shadow:0 8px 22px rgba(180,150,40,.10)}
body.dark .qaSection{background:#2c2b20;border-color:#6a6034}
.qaTitle{font-family:'Kalam',cursive;font-size:25px;color:#5057ca;margin-bottom:12px}
.qaItem{padding:15px 0;border-top:1px dashed #cfd6e5}
.qaItem:first-child{border-top:0}
.qaQuestion{font-weight:900;line-height:1.55}
.qaAnswer{display:none;margin-top:9px;padding:14px 16px;border-radius:12px;background:#eaf7e8;color:#285c2b;line-height:1.75;font-family:Kalam,cursive;font-size:18px}
body.dark .qaAnswer{background:#243b2a;color:#bfe5c0}
.showAnswer{margin-top:8px;padding:8px 12px;border:0;border-radius:10px;background:#ececff;color:#4f56c6;font-weight:800;cursor:pointer}
body.dark .showAnswer{background:#2a3348;color:#a8aeff}

/* Flashcards */
.flashGrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:16px;margin-top:18px}
.flashCard{perspective:1000px;height:160px;cursor:pointer}
.flashInner{position:relative;width:100%;height:100%;transition:transform .45s;transform-style:preserve-3d}
.flashCard.flipped .flashInner{transform:rotateY(180deg)}
.flashFront,.flashBack{position:absolute;inset:0;backface-visibility:hidden;border-radius:16px;display:flex;align-items:center;justify-content:center;padding:16px;text-align:center;font-weight:800;font-size:16px;border:1px solid #dce4f0;box-shadow:0 8px 20px rgba(48,64,110,.08)}
.flashFront{background:linear-gradient(135deg,#eef1ff,#fffdf0);color:#5057c9}
.flashBack{background:linear-gradient(135deg,#edf9e9,#fff3d5);color:#285c2b;transform:rotateY(180deg);font-family:Kalam,cursive;font-size:18px;line-height:1.4}
body.dark .flashFront{background:linear-gradient(135deg,#2a3348,#222b3c);color:#a8aeff;border-color:#344056}
body.dark .flashBack{background:linear-gradient(135deg,#243b2a,#3a3420);color:#bfe5c0;border-color:#344056}

.bookmarkList .chapter{cursor:pointer}
.emptyState{text-align:center;padding:40px 20px;color:#78849b}
.emptyState .bigIcon{font-size:48px;margin-bottom:12px}

/* Temporary notebook */
.nbBox{margin-top:18px;padding:21px;border-radius:17px;border:2px dashed #a8b0e0;background:#f4f6ff}
body.dark .nbBox{background:#1e2638;border-color:#4a5570}
.nbBox h3{font-family:Kalam,cursive;color:#5057ca;font-size:25px;margin-bottom:9px}
.nbArea{width:100%;min-height:120px;border:1px solid #d0d7e8;border-radius:12px;padding:14px;font-family:Kalam,cursive;font-size:18px;line-height:1.55;resize:vertical;background:#fffef8;color:#263047}
body.dark .nbArea{background:#171e2d;border-color:#344056;color:#edf1ff}
.nbArea:focus{outline:2px solid #5b61df;border-color:#5b61df}
.nbHint{font-size:12px;color:#78849b;margin-top:8px}
.nbList{display:flex;flex-direction:column;gap:12px;margin-top:16px}
.nbItem{padding:14px 16px;border-radius:14px;background:#fffdf8;border:1px solid #dce4f0;position:relative}
body.dark .nbItem{background:#222b3c;border-color:#344056}
.nbItem h4{font-size:14px;color:#5b61df;margin-bottom:6px}
.nbItem p{font-family:Kalam,cursive;font-size:17px;line-height:1.5;white-space:pre-wrap}
.nbItem .nbDel{position:absolute;top:10px;right:10px;border:0;background:#f8d7da;color:#721c24;border-radius:8px;padding:4px 8px;font-size:11px;font-weight:800;cursor:pointer}
body.dark .nbItem .nbDel{background:#3d1e22;color:#f5c2c7}
.nbToolbar{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px;align-items:center}
.nbSaved{font-size:12px;font-weight:800;color:#317436;opacity:0;transition:opacity .3s}
.nbSaved.show{opacity:1}

/* Confetti canvas */
#confetti{position:fixed;inset:0;pointer-events:none;z-index:200}

@media(max-width:880px){.hero,.dashboard{grid-template-columns:1fr}.subjects{grid-template-columns:repeat(2,1fr)}}
@media(max-width:600px){.subjects{grid-template-columns:1fr}.hero{padding:27px}.hero h2{font-size:43px}.header-actions .btn{padding:8px 10px;font-size:12px}}
@media print{
  header,footer,.actions,.navCh,.showAnswer,.btn,.header-actions{display:none!important}
  .modal{position:static;background:none;padding:0}
  .box{max-height:none;box-shadow:none;border:none;background:#fff;padding:0}
  .close{display:none}
  body{background:#fff;color:#000}
}