:root{
  --cream:#FBF3E4;
  --paper:#FFFCF6;
  --ink:#1F2A3C;
  --ink-soft:#54607A;
  --coral:#FF6B5E;
  --coral-dark:#E84C3D;
  --teal:#1FA38C;
  --teal-dark:#15806D;
  --amber:#F5A623;
  --amber-dark:#D98A0F;
  --violet:#6C63D8;
  --line:#E7DCC6;
  --green:#27AE60;
  --red:#E84C3D;
  --shadow:0 18px 40px -18px rgba(31,42,60,.35);
}
*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
body{
  font-family:'Heebo',sans-serif;
  background:
    radial-gradient(circle at 12% 18%, rgba(255,107,94,.10), transparent 38%),
    radial-gradient(circle at 88% 12%, rgba(31,163,140,.12), transparent 40%),
    radial-gradient(circle at 70% 95%, rgba(245,166,35,.12), transparent 42%),
    var(--cream);
  color:var(--ink);
  min-height:100vh;
  -webkit-font-smoothing:antialiased;
}
.wrap{max-width:920px;margin:0 auto;padding:22px 18px 64px}
h1,h2,h3,.display{font-family:'Secular One',sans-serif;font-weight:400;letter-spacing:.2px}

/* ---------- Header ---------- */
.topbar{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-bottom:22px}
.brand{display:flex;align-items:center;gap:12px;cursor:pointer}
.logo{
  width:52px;height:52px;border-radius:16px;flex:0 0 52px;
  background:linear-gradient(135deg,var(--coral),var(--amber));
  display:grid;place-items:center;color:#fff;font-family:'Secular One';font-size:26px;
  box-shadow:0 10px 22px -8px rgba(232,76,61,.6);transform:rotate(-4deg);
}
.brand h1{font-size:23px;line-height:1}
.brand p{font-size:12.5px;color:var(--ink-soft);margin-top:3px}
.streak{
  background:var(--paper);border:1px solid var(--line);border-radius:14px;
  padding:8px 14px;font-weight:700;font-size:14px;display:flex;align-items:center;gap:7px;
  box-shadow:var(--shadow)
}
.streak .num{color:var(--amber-dark);font-family:'Secular One';font-size:18px}

/* ---------- Cards / generic ---------- */
.card{background:var(--paper);border:1px solid var(--line);border-radius:22px;box-shadow:var(--shadow)}
.hero{padding:30px 28px;margin-bottom:26px;position:relative;overflow:hidden}
.hero:before{content:"";position:absolute;inset:auto -60px -90px auto;width:220px;height:220px;border-radius:50%;background:radial-gradient(circle,rgba(108,99,216,.14),transparent 70%)}
.hero h2{font-size:30px;line-height:1.15;margin-bottom:8px}
.hero p{color:var(--ink-soft);font-size:15.5px;max-width:560px;line-height:1.6}
.float-math{position:absolute;font-family:'Secular One';color:var(--line);user-select:none}

.section-title{font-size:21px;margin:30px 4px 14px;display:flex;align-items:center;gap:10px}
.section-title small{font-family:'Heebo';font-weight:500;font-size:13px;color:var(--ink-soft)}

/* ---------- Grade grid ---------- */
.grade-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.grade{
  cursor:pointer;border:none;text-align:center;padding:22px 10px;border-radius:20px;color:#fff;
  font-family:'Secular One';position:relative;overflow:hidden;transition:transform .18s ease, box-shadow .18s ease;
  box-shadow:0 12px 26px -12px rgba(31,42,60,.5)
}
.grade:hover{transform:translateY(-5px) scale(1.02)}
.grade .g{font-size:42px;display:block;line-height:1}
.grade .lbl{font-family:'Heebo';font-weight:700;font-size:13px;opacity:.95;margin-top:4px;display:block}
.grade .ages{font-family:'Heebo';font-weight:500;font-size:11px;opacity:.8}
.g6{background:linear-gradient(140deg,#FF8A5B,#FF6B5E)}
.g7{background:linear-gradient(140deg,#34C7AC,#1FA38C)}
.g8{background:linear-gradient(140deg,#7B8BFF,#6C63D8)}
.g9{background:linear-gradient(140deg,#FFC24B,#F5A623)}

/* ---------- mode tabs ---------- */
.modes{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:14px}
.mode{cursor:pointer;background:var(--paper);border:1px solid var(--line);border-radius:18px;padding:18px;text-align:center;transition:.16s;box-shadow:var(--shadow)}
.mode:hover{transform:translateY(-3px);border-color:var(--coral)}
.mode .ic{font-size:30px}
.mode h3{font-size:17px;margin:8px 0 4px}
.mode p{font-size:12.5px;color:var(--ink-soft)}

/* ---------- topic list ---------- */
.topics{display:grid;grid-template-columns:repeat(2,1fr);gap:13px}
.topic{
  cursor:pointer;background:var(--paper);border:1px solid var(--line);border-radius:18px;padding:16px 18px;
  display:flex;align-items:center;gap:14px;transition:.16s;box-shadow:var(--shadow);text-align:right
}
.topic:hover{transform:translateY(-3px);border-color:var(--teal)}
.topic .emoji{width:46px;height:46px;border-radius:13px;display:grid;place-items:center;font-size:23px;flex:0 0 46px;background:var(--cream)}
.topic h3{font-size:16px;font-family:'Heebo';font-weight:700}
.topic p{font-size:12px;color:var(--ink-soft);margin-top:2px}

/* ---------- buttons ---------- */
.btn{cursor:pointer;border:none;border-radius:14px;font-family:'Heebo';font-weight:700;font-size:15px;padding:13px 22px;transition:.15s;color:#fff}
.btn-coral{background:var(--coral)}.btn-coral:hover{background:var(--coral-dark)}
.btn-teal{background:var(--teal)}.btn-teal:hover{background:var(--teal-dark)}
.btn-amber{background:var(--amber)}.btn-amber:hover{background:var(--amber-dark)}
.btn-ghost{background:transparent;color:var(--ink-soft);border:1px solid var(--line)}
.btn-ghost:hover{background:var(--cream);color:var(--ink)}
.btn:disabled{opacity:.5;cursor:not-allowed}
.back{display:inline-flex;align-items:center;gap:6px;cursor:pointer;color:var(--ink-soft);font-weight:600;font-size:14px;margin-bottom:16px;background:none;border:none;font-family:'Heebo'}
.back:hover{color:var(--coral)}

/* ---------- explanation ---------- */
.explain h2{font-size:25px;margin-bottom:4px}
.explain .sub{color:var(--ink-soft);margin-bottom:20px;font-size:14.5px}
.block{border-right:4px solid var(--teal);background:var(--cream);border-radius:0 14px 14px 0;padding:14px 18px;margin:14px 0;line-height:1.7;font-size:15px}
.block.rule{border-right-color:var(--coral)}
.block.example{border-right-color:var(--amber)}
.block b{color:var(--ink)}
.eq{font-family:'Secular One';font-size:20px;background:#fff;border:1px dashed var(--line);border-radius:12px;padding:10px 16px;display:inline-block;margin:6px 4px;direction:ltr}
.steps{counter-reset:s;margin:8px 0}
.steps li{list-style:none;position:relative;padding:8px 44px 8px 8px;margin:6px 0;background:#fff;border:1px solid var(--line);border-radius:12px;font-size:14.5px;line-height:1.5}
.steps li:before{counter-increment:s;content:counter(s);position:absolute;right:10px;top:8px;width:24px;height:24px;background:var(--teal);color:#fff;border-radius:50%;display:grid;place-items:center;font-family:'Secular One';font-size:13px}
.parent-tip{margin-top:18px;background:linear-gradient(135deg,rgba(245,166,35,.12),rgba(255,107,94,.08));border:1px solid var(--amber);border-radius:16px;padding:16px 18px}
.parent-tip h4{font-family:'Secular One';color:var(--amber-dark);font-size:16px;margin-bottom:6px;display:flex;align-items:center;gap:8px}
.parent-tip p{font-size:14px;line-height:1.65}

/* ---------- video library ---------- */
.video-box{margin-top:20px;background:linear-gradient(135deg,rgba(31,163,140,.10),rgba(108,99,216,.08));border:1px solid var(--teal);border-radius:16px;padding:16px 18px}
.video-box h4{font-family:'Secular One';color:var(--teal-dark);font-size:16px;margin-bottom:4px;display:flex;align-items:center;gap:8px}
.video-box .vsub{font-size:13.5px;color:var(--ink-soft);line-height:1.5;margin-bottom:12px}
.video-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.video-card{display:flex;align-items:center;gap:10px;text-decoration:none;background:#fff;border:1px solid var(--line);border-radius:13px;padding:12px 13px;color:var(--ink);font-weight:600;font-size:13.5px;transition:.14s}
.video-card:hover{transform:translateY(-3px);border-color:var(--teal);box-shadow:0 10px 22px -12px rgba(31,163,140,.5)}
.video-card .play{flex:0 0 30px;width:30px;height:30px;border-radius:9px;background:linear-gradient(135deg,var(--coral),var(--amber));color:#fff;display:grid;place-items:center;font-size:12px}
.video-card .vlabel{line-height:1.3}
@media(max-width:640px){.video-grid{grid-template-columns:1fr}}

/* ---------- practice ---------- */
.practice-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px}
.scorepill{background:var(--cream);border-radius:12px;padding:7px 14px;font-weight:700;font-size:14px}
.scorepill b{color:var(--teal-dark);font-family:'Secular One'}
.qcard{padding:28px 26px}
.qnum{font-size:13px;color:var(--ink-soft);font-weight:600;margin-bottom:8px}
.question{font-family:'Secular One';font-size:30px;line-height:1.3;margin-bottom:22px;direction:ltr;text-align:center}
.question.he{direction:rtl}
.answer-row{display:flex;gap:10px;align-items:center;justify-content:center;flex-wrap:wrap}
.answer-row input{
  font-family:'Secular One';font-size:24px;text-align:center;width:170px;padding:12px;border-radius:14px;
  border:2px solid var(--line);background:#fff;color:var(--ink);direction:ltr;outline:none;transition:.15s
}
.answer-row input:focus{border-color:var(--teal)}
.feedback{margin-top:20px;border-radius:16px;padding:16px 18px;font-size:15px;line-height:1.6;display:none}
.feedback.show{display:block;animation:pop .25s ease}
.feedback.ok{background:rgba(39,174,96,.12);border:1px solid var(--green)}
.feedback.no{background:rgba(232,76,61,.1);border:1px solid var(--red)}
.feedback h4{font-family:'Secular One';font-size:17px;margin-bottom:6px}
.feedback.ok h4{color:var(--green)}.feedback.no h4{color:var(--red)}
.solsteps{margin-top:8px;font-size:14px}
.solsteps li{margin:4px 0;padding-right:4px}
.hintbox{margin-top:12px;font-size:14px;color:var(--ink-soft);background:var(--cream);border-radius:12px;padding:10px 14px;display:none}
.hintbox.show{display:block}
@keyframes pop{from{transform:scale(.96);opacity:0}to{transform:scale(1);opacity:1}}

/* ---------- game ---------- */
.game-stage{padding:30px 26px;text-align:center;position:relative}
.timer-bar{height:10px;background:var(--cream);border-radius:8px;overflow:hidden;margin-bottom:22px}
.timer-fill{height:100%;background:linear-gradient(90deg,var(--teal),var(--amber),var(--coral));width:100%;transition:width .1s linear}
.game-q{font-family:'Secular One';font-size:46px;direction:ltr;margin:10px 0 26px}
.game-opts{display:grid;grid-template-columns:repeat(2,1fr);gap:13px;max-width:420px;margin:0 auto}
.opt{cursor:pointer;border:2px solid var(--line);background:#fff;border-radius:16px;padding:18px;font-family:'Secular One';font-size:26px;transition:.12s}
.opt:hover{border-color:var(--violet);transform:translateY(-2px)}
.opt.correct{background:rgba(39,174,96,.15);border-color:var(--green)}
.opt.wrong{background:rgba(232,76,61,.12);border-color:var(--red)}
.game-score{display:flex;justify-content:center;gap:26px;margin-bottom:6px;font-weight:700}
.game-score .v{font-family:'Secular One';font-size:24px;color:var(--violet)}
.bigresult{font-family:'Secular One';font-size:54px;color:var(--violet)}

/* ---------- progress dots ---------- */
.dots{display:flex;gap:6px;justify-content:center;margin-top:8px}
.dot{width:10px;height:10px;border-radius:50%;background:var(--line)}
.dot.ok{background:var(--green)}.dot.no{background:var(--red)}.dot.cur{background:var(--amber);transform:scale(1.3)}

.hidden{display:none!important}
.fade{animation:fade .3s ease}
@keyframes fade{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.footer{text-align:center;margin-top:40px;color:var(--ink-soft);font-size:12.5px}
@media(max-width:640px){
  .grade-grid{grid-template-columns:repeat(2,1fr)}
  .topics{grid-template-columns:1fr}
  .modes{grid-template-columns:1fr}
  .hero h2{font-size:24px}
  .question{font-size:24px}
  .game-q{font-size:38px}
}

/* עיקרון קצר בתוך המשוב */
.principle{background:var(--cream);border-radius:10px;padding:9px 12px;font-size:13.5px;line-height:1.5;margin:6px 0 4px}
.principle b{color:var(--ink)}

/* שרטוט המחשה במסך הלימוד */
.topic-fig{background:var(--cream);border:1px solid var(--line);border-radius:14px;padding:12px;margin:6px 0 16px}

/* מסך כניסה */
.auth-card{max-width:360px;margin:30px auto;padding:30px 26px;text-align:center}
.auth-logo{width:60px;height:60px;border-radius:18px;margin:0 auto 12px;background:linear-gradient(135deg,var(--coral),var(--amber));display:grid;place-items:center;color:#fff;font-family:'Secular One';font-size:30px}
.auth-card h2{font-size:24px;margin-bottom:4px}
.auth-sub{color:var(--ink-soft);font-size:14px;margin-bottom:18px}
.auth-in{font-family:'Heebo';font-size:16px;padding:12px;border:2px solid var(--line);border-radius:12px;width:100%;box-sizing:border-box;margin:7px 0;background:#fff;color:var(--ink)}
.auth-in:focus{outline:none;border-color:var(--teal)}
.auth-btn{width:100%;margin-top:10px}
.auth-err{color:var(--red);font-size:14px;margin-top:10px;min-height:18px}
.auth-switch{margin-top:16px;font-size:14px;color:var(--ink-soft)}
.auth-switch a,.auth-guest a{color:var(--teal-dark);font-weight:700;cursor:pointer;text-decoration:none}
.auth-guest{margin-top:14px;font-size:13.5px}
.auth-guest a{color:var(--ink-soft)}

/* תיבת המורה החכם */
.tutor-box{display:none;margin-top:12px;background:linear-gradient(135deg,rgba(245,166,35,.12),rgba(255,107,94,.08));border:1px solid var(--amber);border-radius:14px;padding:13px 15px;font-size:14.5px;line-height:1.6;text-align:right}
.tutor-box.show{display:block;animation:pop .25s ease}
.tutor-loading{color:var(--ink-soft)}
.tutor-err{color:var(--red)}

/* מתג שפה */
.lang-toggle{position:absolute;top:18px;left:18px;background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:6px 14px;font-family:'Heebo';font-weight:700;font-size:13px;color:var(--ink);cursor:pointer;z-index:5;box-shadow:var(--shadow)}
html[dir="ltr"] .lang-toggle{left:auto;right:18px}
.lang-toggle:hover{border-color:var(--teal)}
.wrap{position:relative}

/* מסך בחירת מקצוע */
.subject-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:16px;margin-top:20px}
.subject-card{display:flex;flex-direction:column;align-items:center;gap:12px;padding:38px 20px;border:none;border-radius:22px;cursor:pointer;background:#fff;box-shadow:var(--shadow);transition:transform .15s,box-shadow .15s}
.subject-card:hover{transform:translateY(-4px);box-shadow:0 12px 30px rgba(0,0,0,.12)}
.subj-emoji{font-size:56px}
.subj-name{font-family:'Secular One';font-size:24px;color:var(--ink)}

/* שאלות רב-ברירה */
.choices{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:18px}
.choice{font-family:'Heebo';font-size:17px;font-weight:500;padding:16px;border:2px solid var(--line);border-radius:14px;background:#fff;color:var(--ink);cursor:pointer;transition:border-color .15s,background .15s}
.choice:hover{border-color:var(--teal)}
.choice.locked{pointer-events:none}
.choice.correct-choice{border-color:var(--teal);background:rgba(31,163,140,.12)}
.choice.wrong-choice.picked{border-color:var(--coral);background:rgba(255,107,94,.12)}
@media(max-width:480px){.choices{grid-template-columns:1fr}}

/* כותרת שאלה מילולית באנגלית מיושרת לשמאל, ושמירה על שורות בקטע קריאה */
.question.en-word{direction:ltr;text-align:left}
.question{white-space:pre-line}

/* צבעי כיתות יסודי (לשון) */
.grade.g1{background:linear-gradient(135deg,#FF8A7E,#FF6B5E)}
.grade.g2{background:linear-gradient(135deg,#FFC46B,#F5A623)}
.grade.g3{background:linear-gradient(135deg,#3DBBA4,#1FA38C)}
.grade.g4{background:linear-gradient(135deg,#8B84E0,#6C63D8)}
.grade.g5{background:linear-gradient(135deg,#FF8A7E,#FF6B5E)}

/* לוח אלופים */
.lb-wrap{margin-top:26px}
.lb-title{font-family:'Secular One';font-size:22px;text-align:center;margin-bottom:14px;color:var(--ink)}
.lb-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.lb-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:18px 20px;box-shadow:var(--shadow)}
.lb-card h3{font-family:'Secular One';font-size:18px;margin-bottom:12px;color:var(--ink)}
.lb-list{list-style:none;margin:0;padding:0}
.lb-list li{display:flex;align-items:center;gap:10px;padding:8px 0;border-bottom:1px solid var(--line);font-size:15px}
.lb-list li:last-child{border-bottom:none}
.lb-medal{width:24px;text-align:center}
.lb-name{flex:1;font-weight:500;color:var(--ink)}
.lb-score{font-family:'Secular One';color:var(--teal-dark)}
.lb-empty{color:var(--ink-soft);font-size:14px}
@media(max-width:520px){.lb-grid{grid-template-columns:1fr}}