/* ====== فِهم الرياضيات — كرّاسة رياضيات دافئة ====== */
:root{
  --paper:#FDF6E9;
  --paper-2:#FFFCF4;
  --ink:#2B3A42;
  --ink-soft:#5F6F77;
  --teal:#1FA9A0;
  --teal-deep:#12817A;
  --teal-soft:#DDF3F0;
  --amber:#FFC94A;
  --amber-soft:#FFF3D0;
  --coral:#FF7A59;
  --coral-deep:#B23A22;
  --coral-soft:#FFE7E0;
  --cream:#F6E3C5;
  --radius:20px;
  --shadow:0 3px 0 rgba(43,58,66,.82);
  --shadow-sm:0 2px 0 rgba(43,58,66,.82);
}
*,*::before,*::after{box-sizing:border-box}
html,body{margin:0;padding:0}
html{-webkit-text-size-adjust:100%}
body{
  background:var(--paper);
  color:var(--ink);
  font-family:'Tajawal',system-ui,-apple-system,'Segoe UI',sans-serif;
  font-size:16px;
  line-height:1.6;
  min-height:100vh;
  -webkit-font-smoothing:antialiased;
  -webkit-tap-highlight-color:transparent;
  overscroll-behavior-y:contain;
}
h1,h2,h3,.font-disp{font-family:'Baloo Bhaijaan 2','Tajawal',system-ui,sans-serif;font-weight:800;}
button,input,textarea{font-family:inherit;color:inherit}
button{cursor:pointer;border:none;background:none;padding:0}
.hidden{display:none !important}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

/* ورق مسطّر */
.paper-bg{
  position:fixed;inset:0;z-index:0;pointer-events:none;
  background-image:
    linear-gradient(rgba(43,58,66,.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(43,58,66,.04) 1px, transparent 1px);
  background-size:24px 24px;
  background-position:-1px -1px;
}

.wrap{
  position:relative;z-index:1;
  max-width:480px;
  margin-inline:auto;
  padding:14px 16px 44px;
}

/* ====== الهيدر ====== */
.app-header{
  display:flex;align-items:center;gap:10px;
  padding:4px 2px 14px;
}
.fox-slot{width:64px;flex:0 0 auto;line-height:0}
.fox-slot--mid{width:76px}
.fox-slot--big{width:92px}
.fox-slot .fox{width:100%;height:auto;display:block;overflow:visible}
.header-copy{flex:1;min-width:0}
.header-copy h1{
  margin:0;font-size:22px;line-height:1.15;letter-spacing:0;
}
.header-copy p{
  margin:3px 0 0;font-size:12.5px;color:var(--ink-soft);line-height:1.35;
}
.star-pill{
  flex:0 0 auto;display:inline-flex;align-items:center;gap:4px;
  background:var(--amber);border:2px solid var(--ink);border-radius:999px;
  padding:3px 10px;font-weight:800;font-size:14px;box-shadow:var(--shadow-sm);
}
.star-pill .star-ico{font-size:13px;line-height:1}

/* ====== البطاقات ====== */
.card{
  background:var(--paper-2);
  border:2px solid var(--ink);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  padding:16px;
  margin-bottom:16px;
}
.card-title{
  margin:0 0 10px;font-size:17px;line-height:1.3;
  display:flex;align-items:center;gap:8px;
}
.badge-num{
  display:inline-flex;align-items:center;justify-content:center;
  width:26px;height:26px;flex:0 0 auto;
  border:2px solid var(--ink);border-radius:50%;
  background:var(--amber);font-size:14px;font-weight:800;
  font-family:'Tajawal',sans-serif;
}

/* ====== اختيار الصف ====== */
.grades{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.grade{
  min-height:52px;border:2px solid var(--ink);border-radius:16px;
  background:#fff;box-shadow:var(--shadow-sm);
  display:flex;align-items:center;justify-content:center;gap:6px;
  font-family:'Baloo Bhaijaan 2',sans-serif;font-weight:700;font-size:15px;
  color:var(--ink);
  transition:transform .08s ease, box-shadow .08s ease, background .15s ease;
  user-select:none;-webkit-user-select:none;
}
.grade .g-num{
  display:inline-flex;align-items:center;justify-content:center;
  width:22px;height:22px;border-radius:50%;
  background:var(--cream);border:2px solid var(--ink);
  font-size:12px;font-family:'Tajawal',sans-serif;font-weight:800;
}
.grade[aria-pressed="true"]{background:var(--teal);}
.grade[aria-pressed="true"] .g-num{background:var(--paper-2)}
.grade:active{transform:translateY(2px);box-shadow:none}

/* ====== الإدخال ====== */
#problemInput{
  width:100%;min-height:78px;resize:none;
  border:2px solid var(--ink);border-radius:16px;
  background:#fff;padding:12px 14px;
  font-family:'Baloo Bhaijaan 2','Tajawal',sans-serif;
  font-size:26px;font-weight:700;color:var(--ink);
  direction:ltr;text-align:left;
  outline:none;box-shadow:inset 0 -3px 0 rgba(43,58,66,.06);
  transition:box-shadow .15s ease, border-color .15s ease;
}
#problemInput::placeholder{
  font-family:'Tajawal',sans-serif;font-weight:500;font-size:16px;color:#94A3AA;
}
#problemInput:focus{
  border-color:var(--teal-deep);
  box-shadow:0 0 0 3px rgba(31,169,160,.22);
}

.input-tools{display:flex;gap:8px;margin-top:10px}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:48px;padding:0 16px;
  border:2px solid var(--ink);border-radius:16px;
  font-family:'Baloo Bhaijaan 2','Tajawal',sans-serif;
  font-weight:700;font-size:17px;color:var(--ink);
  background:var(--paper-2);box-shadow:var(--shadow-sm);
  transition:transform .08s ease, box-shadow .08s ease, background .15s ease;
  user-select:none;-webkit-user-select:none;
}
.btn:active{transform:translateY(2px);box-shadow:none}
.btn:focus-visible{outline:none;box-shadow:0 0 0 3px rgba(31,169,160,.45),var(--shadow-sm)}
.btn[disabled]{opacity:.55;pointer-events:none}
.btn-photo{flex:1;background:var(--cream);font-size:16px}
.btn-clear{width:52px;padding:0;background:var(--coral-soft);flex:0 0 auto}
.ico{width:22px;height:22px;flex:0 0 auto}

.preview{
  position:relative;margin-top:12px;
  border:2px solid var(--ink);border-radius:16px;overflow:hidden;background:#fff;
}
.preview img{display:block;width:100%;max-height:220px;object-fit:contain}
.preview-x{
  position:absolute;top:8px;inset-inline-end:8px;
  width:32px;height:32px;border-radius:50%;
  background:var(--coral);border:2px solid var(--ink);color:#fff;
  font-size:14px;font-weight:800;display:flex;align-items:center;justify-content:center;
  box-shadow:var(--shadow-sm);
}

/* ====== لوحة الأرقام ====== */
.keypad{
  display:grid;grid-template-columns:repeat(4,1fr);gap:8px;
  margin:14px 0 12px;
}
.key{
  min-height:56px;border:2px solid var(--ink);border-radius:14px;
  background:#fff;color:var(--ink);
  font-family:'Baloo Bhaijaan 2',sans-serif;font-size:23px;font-weight:700;
  box-shadow:0 3px 0 rgba(43,58,66,.78);
  display:flex;align-items:center;justify-content:center;
  transition:transform .07s ease, box-shadow .07s ease, background .12s ease;
  user-select:none;-webkit-user-select:none;
}
.key:active{transform:translateY(3px);box-shadow:none}
.key--op{background:var(--amber)}
.key--fn{background:var(--cream);font-size:20px}

/* ====== زر الحل ====== */
.solve-btn{
  width:100%;min-height:58px;font-size:19px;
  background:var(--teal);color:var(--ink);
  border-radius:18px;
  box-shadow:0 4px 0 rgba(43,58,66,.82);
  gap:10px;
}
.solve-btn:active{transform:translateY(4px);box-shadow:none}
.cost-chip{
  display:inline-flex;align-items:center;gap:4px;
  background:var(--paper-2);border:2px solid var(--ink);border-radius:999px;
  padding:2px 10px;font-size:13.5px;font-weight:800;
  font-family:'Tajawal',sans-serif;
}
.hint{margin:8px 2px 0;font-size:12.5px;color:var(--ink-soft);line-height:1.45;min-height:0}

/* ====== نتيجة الحل ====== */
.result-head{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:6px}
.result-head-copy{flex:1;min-width:0}
.problem-echo{
  margin:2px 0 0;font-family:'Baloo Bhaijaan 2',sans-serif;font-weight:700;
  font-size:20px;color:var(--ink);
  overflow-wrap:anywhere;
}
.tags{display:flex;gap:6px;flex-wrap:wrap}
.tag{
  display:inline-block;font-size:11.5px;font-weight:700;
  background:var(--teal-soft);border:2px solid var(--ink);border-radius:999px;
  padding:1px 9px;color:var(--ink);
}
.tag--warn{background:var(--amber-soft)}
.icon-btn{
  width:44px;height:44px;flex:0 0 auto;
  display:flex;align-items:center;justify-content:center;
  border:2px solid var(--ink);border-radius:14px;background:#fff;
  box-shadow:var(--shadow-sm);
}
.icon-btn:active{transform:translateY(2px);box-shadow:none}
.icon-btn svg{width:22px;height:22px;stroke:var(--ink);fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.icon-btn.is-on{background:var(--amber)}

.steps{list-style:none;margin:14px 0 0;padding:0;display:flex;flex-direction:column;gap:10px}
.step{
  display:flex;gap:10px;align-items:flex-start;
  background:#fff;border:2px solid var(--ink);border-radius:16px;
  padding:10px 12px;
  box-shadow:0 2px 0 rgba(43,58,66,.14);
  opacity:0;animation:stepIn .34s ease forwards;
  animation-delay:calc(var(--i) * 70ms + 40ms);
}
@keyframes stepIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.step-num{
  flex:0 0 auto;width:26px;height:26px;border-radius:50%;
  background:var(--amber);border:2px solid var(--ink);
  display:flex;align-items:center;justify-content:center;
  font-weight:800;font-size:13px;font-family:'Tajawal',sans-serif;
  margin-top:2px;
}
.step-body{flex:1;min-width:0}
.step-body h3{margin:0 0 2px;font-size:14.5px;font-weight:800;color:var(--teal-deep)}
.step-body p{margin:0;font-size:15.5px;line-height:1.55;color:var(--ink)}

/* فهم يشير للخطوة */
.pointer-fox{display:flex;justify-content:center;margin-top:10px}

/* ====== الشرح البصري ====== */
.visual{
  margin-top:14px;background:#fff;border:2px solid var(--ink);
  border-radius:16px;padding:12px;
}
.visual-title{
  margin:0 0 10px;font-size:14px;font-weight:800;color:var(--ink);
  display:flex;align-items:center;gap:6px;
}
.visual-title::before{
  content:"";width:10px;height:10px;border-radius:50%;
  background:var(--coral);border:2px solid var(--ink);flex:0 0 auto;
}
.visual-note{margin:10px 0 0;font-size:13.5px;color:var(--ink-soft);text-align:center;font-weight:700}
svg.nl{width:100%;height:auto;display:block;overflow:visible}
.grid-wrap{display:flex;flex-direction:column;gap:6px}
.group-row{
  display:flex;gap:6px;flex-wrap:wrap;
  background:var(--amber-soft);border:2px solid var(--ink);
  border-radius:12px;padding:5px 8px;justify-content:center;
}
.dot{
  width:14px;height:14px;border-radius:50%;
  background:var(--teal);border:2px solid var(--ink);flex:0 0 auto;
}
.dot--alt{background:var(--amber)}
.groups-wrap{display:grid;grid-template-columns:repeat(auto-fit,minmax(72px,1fr));gap:8px}
.group-box{
  border:2px solid var(--ink);border-radius:14px;background:var(--amber-soft);
  padding:6px;display:flex;flex-direction:column;align-items:center;gap:4px;
}
.group-label{font-size:11px;font-weight:800;color:var(--ink-soft)}
.group-dots{display:flex;flex-wrap:wrap;gap:4px;justify-content:center}
.group-count{font-size:12px;font-weight:800;color:var(--teal-deep)}

/* ====== بطاقة الجواب ====== */
.answer-card{
  margin-top:16px;background:var(--amber);
  border:2px solid var(--ink);border-radius:var(--radius);
  box-shadow:0 4px 0 rgba(43,58,66,.82);
  padding:14px 16px;display:flex;align-items:center;justify-content:space-between;gap:12px;
}
.answer-label{font-size:14px;font-weight:800;color:var(--ink);opacity:.85}
.answer-value{
  font-family:'Baloo Bhaijaan 2',sans-serif;font-weight:800;font-size:34px;
  line-height:1;color:var(--ink);overflow-wrap:anywhere;
}
.btn-amber{background:var(--amber);width:100%;margin-top:14px;font-size:17.5px;min-height:54px}
.btn-teal{background:var(--teal);width:100%;margin-top:10px}
.btn-ghost{background:#fff;width:100%;margin-top:10px;font-size:15.5px}

/* ====== حالة التفكير ====== */
.thinking{display:flex;align-items:center;gap:12px}
.thinking-title{margin:0;font-family:'Baloo Bhaijaan 2',sans-serif;font-weight:800;font-size:19px}
.thinking-sub{margin:2px 0 0;font-size:13.5px;color:var(--ink-soft)}
.dots{display:flex;gap:5px;margin-top:8px}
.dots i{
  width:9px;height:9px;border-radius:50%;background:var(--teal);
  border:2px solid var(--ink);display:block;animation:bounce 1s infinite ease-in-out;
}
.dots i:nth-child(2){animation-delay:.15s}
.dots i:nth-child(3){animation-delay:.3s}
@keyframes bounce{0%,100%{transform:translateY(0)}40%{transform:translateY(-6px)}}

/* ====== رفض / خطأ ====== */
.refuse{display:flex;gap:12px;align-items:flex-start}
.refuse h2{margin:0 0 4px;font-size:17px}
.refuse p{margin:0;font-size:14.5px;line-height:1.6}
.notice{
  border:2px solid var(--ink);border-radius:16px;padding:12px;
  background:var(--coral-soft);margin-top:12px;
}
.notice h3{margin:0 0 4px;font-size:15px;color:var(--coral-deep)}
.notice p{margin:0;font-size:14px;line-height:1.55}
.notice--ok{background:var(--teal-soft)}
.notice--ok h3{color:var(--teal-deep)}

/* ====== التدريب ====== */
.practice-head{display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap}
.star-track{display:flex;gap:3px}
.star-track i{
  width:15px;height:15px;display:block;
  background:#fff;border:2px solid var(--ink);border-radius:4px;
  transform:rotate(45deg);transition:background .2s ease, transform .2s ease;
}
.star-track i.on{background:var(--amber);transform:rotate(45deg) scale(1.08)}
.practice-q{
  margin:14px 0 10px;text-align:center;
  font-family:'Baloo Bhaijaan 2',sans-serif;font-weight:800;font-size:32px;
  background:var(--teal-soft);border:2px dashed var(--ink);border-radius:16px;
  padding:14px 10px;color:var(--ink);letter-spacing:.5px;
}
.answer-row{display:flex;gap:8px;align-items:stretch}
.practice-input{
  flex:1;min-width:0;min-height:54px;
  border:2px solid var(--ink);border-radius:16px;background:#fff;
  padding:0 14px;font-family:'Baloo Bhaijaan 2',sans-serif;
  font-size:24px;font-weight:700;text-align:center;direction:ltr;
  outline:none;box-shadow:var(--shadow-sm);
}
.practice-input:focus{border-color:var(--teal-deep);box-shadow:0 0 0 3px rgba(31,169,160,.22)}
.answer-row .btn{min-height:54px;padding:0 22px;flex:0 0 auto;background:var(--teal)}
.feedback{
  min-height:26px;margin:10px 0 0;font-weight:800;font-size:15.5px;text-align:center;
  opacity:0;transition:opacity .2s ease;
}
.feedback.show{opacity:1}
.feedback.good{color:var(--teal-deep)}
.feedback.bad{color:var(--coral-deep)}
.feedback.warn{color:var(--ink-soft)}
.shake{animation:shake .32s ease}
@keyframes shake{0%,100%{transform:translateX(0)}25%{transform:translateX(-6px)}75%{transform:translateX(6px)}}

.foot{
  text-align:center;font-size:12px;color:var(--ink-soft);
  padding:6px 0 10px;
}

/* ====== الثعلب ====== */
.fox{display:block;width:100%;height:auto;overflow:visible}
.fox-eyes{transform-box:view-box;transform-origin:80px 62px;animation:blink 6.4s infinite}
@keyframes blink{0%,92%,100%{transform:scaleY(1)}94%,96%{transform:scaleY(.08)}}
.fox-cloud{opacity:0;transition:opacity .3s ease}
.fox.is-thinking .fox-cloud{opacity:1}
.fox-pencil{transform-box:fill-box;transform-origin:50% 90%;transition:transform .35s ease}
.fox.is-thinking .fox-pencil{transform:rotate(-16deg)}
.fox.is-cheer{animation:hop .55s ease 2}
@keyframes hop{0%,100%{transform:translateY(0)}38%{transform:translateY(-11px) rotate(-3deg)}}
.fox.is-encourage{animation:wiggle .7s ease 2}
@keyframes wiggle{0%,100%{transform:rotate(0)}30%{transform:rotate(-5deg)}70%{transform:rotate(5deg)}}

/* ====== كونفيتي ====== */
.confetti-layer{position:fixed;inset:0;pointer-events:none;z-index:60;overflow:hidden}
.confetti-bit{
  position:fixed;top:-24px;width:10px;height:14px;border-radius:2px;
  animation:fall var(--dur,1.2s) ease-in forwards;
}
@keyframes fall{
  0%{transform:translateY(0) rotate(0);opacity:1}
  100%{transform:translateY(112vh) rotate(560deg);opacity:.85}
}

/* ====== توست ====== */
.toast{
  position:fixed;left:50%;bottom:26px;transform:translateX(-50%);
  background:var(--ink);color:#FDF6E9;
  padding:10px 18px;border-radius:999px;font-size:14px;font-weight:700;
  z-index:70;box-shadow:0 6px 18px rgba(43,58,66,.3);
  animation:toastIn .22s ease;
  max-width:88vw;text-align:center;
}
@keyframes toastIn{from{opacity:0;transform:translate(-50%,10px)}to{opacity:1;transform:translate(-50%,0)}}

/* ====== الشاشات الأصغر ====== */
@media (max-width:360px){
  .wrap{padding:12px 12px 40px}
  .header-copy h1{font-size:20px}
  .fox-slot{width:56px}
  .key{min-height:52px;font-size:21px}
  .grade{font-size:13.5px;gap:4px}
  .practice-q{font-size:27px}
  .answer-value{font-size:29px}
}
@media (min-width:700px){
  .wrap{max-width:520px;padding-top:26px}
  .header-copy h1{font-size:25px}
  .btn:hover{background:#fff}
  .btn-photo:hover{background:var(--cream)}
  .btn-primary:hover{filter:brightness(1.04)}
  .key:hover{background:var(--amber-soft)}
  .key--op:hover{background:#FFD873}
  .grade:hover{background:var(--amber-soft)}
  .grade[aria-pressed="true"]:hover{background:var(--teal)}
}

@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important}
  .step{opacity:1}
}