* { box-sizing: border-box; margin: 0; padding: 0; }
html { height: 100%; }
body { height: 100vh; padding: 2%; font-family: var(--font-family); line-height: var(--lh-base); overflow: hidden; }

/* ══════════════════════════════════════════════
   DESIGN TOKENS
══════════════════════════════════════════════ */
:root {
  /* ── الصواب والخطأ ── */
  --color-correct:      #16a34a;
  --color-correct-bg:   #dcfce7;
  --color-correct-text: #15803d;
  --color-wrong:        #dc2626;
  --color-wrong-bg:     #fee2e2;
  --color-wrong-text:   #b91c1c;

  /* ── الخلفية والأسطح ── */
  --color-bg:          #eef2f9;
  --color-surface:     #ffffff;
  --color-surface-alt: #f5f8ff;

  /* ── النص ── */
  --color-text:       #1e293b;
  --color-text-muted: #64748b;

  /* ── العلامة التجارية ── */
  --color-primary:      #0d47a1;
  --color-primary-deep: #0a1f6b;
  --color-accent:       #1976d2;
  --color-highlight:    #e65100;
  --color-border:       #e2e8f0;
  --color-on-primary:   #fff;

  /* أ125: رقاقات الأزرق الفاتح (أزرار التنقل/الشريط العلوي) — كانت hex متناثرة */
  --color-chip-bg:      #e8f0fe;
  --color-chip-hover:   #bbdefb;

  /* ── الخط ── */
  --font-family: 'Segoe UI', Tahoma, Arial, sans-serif;
  --lh-base: 1.6;

  /* ── مقياس الخط (متجاوب — السقف = 75% من المقياس التاريخي بطلب المالك 2026-07-06،
        يلتحم عند منفذ عرضٍ ارتفاعُه ≥940px تقريباً (شاشة 1080p بمتصفح مكبَّر)،
        وينكمش تدريجياً على الشاشات الأقصر حتى أرضية مقروءة) ── */
  --fs-heading: clamp(1.05rem,   2.55vh,  1.5rem);
  --fs-body:    clamp(0.9375rem, 2.25vh,  1.3125rem);
  --fs-sub:     clamp(0.85rem,   2.1vh,   1.22rem);
  --fs-sm:      clamp(0.75rem,   1.6vh,   0.9375rem);
  --fs-xs:      clamp(0.61rem,   1.28vh,  0.75rem);

  /* ── التباعد ── */
  --sp-1: 0.25rem;
  --sp-2: 0.5rem;
  --sp-3: 0.75rem;
  --sp-4: 1rem;
  --sp-5: 1.25rem;
  --sp-6: 1.5rem;
  --sp-8: 2rem;

  /* ── KIT: المسرح والهوامش ── */
  --stage-w:     min(1040px, 94vw);
  --prose-w:     62ch;
  --stage-pad:   var(--sp-6) var(--sp-4);
  --mentor-size: clamp(140px, 22vh, 240px);
  --bubble-max:  clamp(240px, 32vh, 300px);
  --radius:      14px;
  --radius-lg:   18px;
  --shadow-card: 0 2px 10px rgba(13,71,161,0.08);
  --shadow-pop:  0 8px 28px rgba(0,0,0,0.25);
}

/* ══════════════════════════════════════════════
   FOCUS VISIBILITY — outline موحّد للأزرار والبطاقات عند التنقّل بلوحة المفاتيح
══════════════════════════════════════════════ */
button:focus-visible,
.card:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

/* ── Screens ── */
.screen { display: none; }
#screen-login.active  { display: block; height: 100%; overflow: hidden; }
#screen-nav.active    { display: flex; flex-direction: column; height: 100%; overflow: hidden; }

/* ══════════════════════════════════════════════
   LOGIN SCREEN
══════════════════════════════════════════════ */
.layout {
  display: flex;
  flex-direction: row;
  height: 100%;
  overflow: hidden;
}

.panel-brand {
  flex: 0 0 42%;
  background: linear-gradient(160deg, var(--color-primary-deep) 0%, var(--color-primary) 55%, #1565c0 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: clamp(32px, 5vh, 60px) clamp(28px, 3vw, 48px);
  position: relative;
  overflow: hidden;
}

.panel-brand::before,
.panel-brand::after {
  content: '';
  position: absolute;
  border-radius: 50%;
  background: rgba(255,255,255,0.05);
}
.panel-brand::before { width: 480px; height: 480px; bottom: -160px; left: -120px; }
.panel-brand::after  { width: 300px; height: 300px; top: -90px; right: -70px; }

.brand-icon {
  font-size: clamp(112px, 18vh, 220px);
  line-height: 1;
  margin-bottom: clamp(18px, 3vh, 36px);
  filter: drop-shadow(0 6px 20px rgba(0,0,0,0.35));
}

.brand-title {
  font-size: clamp(52px, 8vh, 92px);
  font-weight: 700;
  color: var(--color-on-primary);
  text-align: center;
  line-height: 1.45;
}

.brand-subtitle {
  font-size: clamp(36px, 5.2vh, 60px);
  font-weight: 600;
  color: #ffd54f;
  margin-top: clamp(10px, 1.6vh, 18px);
  text-align: center;
}

.brand-divider {
  width: 64px;
  height: 5px;
  background: rgba(255,213,79,0.55);
  border-radius: 3px;
  margin: clamp(16px, 2.5vh, 28px) auto 0;
}

/* كتلة معلّم المادة — تحت الصف الدراسي مباشرةً في عمود العلامة (شاشة البداية).
   القيمة تأتي من window.SUBSCRIBER (ملف subscriber.js) وتحقنها app.js. */
.brand-teacher {
  margin-top: clamp(16px, 2.5vh, 28px);
  text-align: center;
  line-height: 1.5;
}
.brand-teacher-label {
  font-size: clamp(22px, 3vh, 34px);
  font-weight: 600;
  color: var(--color-on-primary);
  opacity: 0.85;
}
.brand-teacher-name {
  font-size: clamp(28px, 4vh, 46px);
  font-weight: 700;
  color: #ffd54f;
  margin-top: clamp(4px, 0.8vh, 10px);
}

/* رقم الإصدار الداخليّ — صغيرٌ في أسفل عمود العلامة الأزرق (شاشة البداية).
   موضعٌ مطلقٌ في الزاوية السفلى، لا يزاحم المحتوى المتمركز. */
.brand-version {
  position: absolute;
  bottom: clamp(10px, 1.6vh, 20px);
  right: clamp(14px, 1.8vw, 26px);
  font-size: clamp(13px, 1.5vh, 17px);
  font-weight: 500;
  color: rgba(255, 255, 255, 0.55);
  letter-spacing: 0.3px;
  z-index: 1;
  user-select: none;
  pointer-events: none;
}

.panel-form {
  flex: 1;
  background: var(--color-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: clamp(20px, 3vh, 40px) clamp(24px, 3vw, 48px);
  overflow: hidden;
}

.form-card {
  background: var(--color-surface);
  border-radius: 20px;
  padding: clamp(24px, 3.5vh, 44px) clamp(28px, 3vw, 48px);
  width: 100%;
  max-width: 700px;
  box-shadow: 0 8px 48px rgba(13,71,161,0.13);
}

.form-greeting {
  font-size: clamp(34px, 4.4vh, 48px);
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: clamp(16px, 2.5vh, 32px);
  text-align: center;
}

#prev-section {
  display: none;
  margin-bottom: clamp(14px, 2vh, 26px);
}

#prev-section h3 {
  font-size: clamp(26px, 3.2vh, 34px);
  color: var(--color-text-muted);
  margin-bottom: clamp(8px, 1.2vh, 14px);
  text-align: center;
}

#prev-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  max-height: clamp(80px, 14vh, 140px);
  overflow-y: auto;
}

.prev-btn {
  background: var(--color-chip-bg);
  color: #1a237e;
  border: 1.5px solid #90caf9;
  border-radius: 22px;
  padding: clamp(7px, 1vh, 12px) clamp(18px, 2vw, 28px);
  font-size: clamp(26px, 3.2vh, 32px);
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
  font-family: inherit;
  white-space: nowrap;
}

.prev-btn:hover    { background: var(--color-chip-hover); transform: translateY(-1px); }
.prev-btn.selected { background: var(--color-primary); color: var(--color-on-primary); border-color: var(--color-primary); }

.device-note {
  text-align: center;
  font-size: clamp(22px, 2.6vh, 26px);
  color: var(--color-text-muted);
  margin: clamp(6px, 0.9vh, 10px) 0 0;
}

.divider {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: clamp(10px, 1.4vh, 16px) 0;
  color: var(--color-text-muted);
  font-size: clamp(24px, 2.8vh, 28px);
}
.divider::before, .divider::after {
  content: ''; flex: 1; height: 1px; background: var(--color-border);
}

.field { margin-bottom: clamp(14px, 2vh, 22px); }

.field label {
  display: block;
  font-size: clamp(30px, 4vh, 40px);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: clamp(6px, 0.9vh, 10px);
}

.field input {
  width: 100%;
  padding: clamp(12px, 1.8vh, 20px) clamp(16px, 1.8vw, 24px);
  border: 2px solid #dce3ef;
  border-radius: 12px;
  font-size: clamp(28px, 3.8vh, 38px);
  font-family: inherit;
  color: var(--color-text);
  transition: border-color 0.2s;
  outline: none;
  direction: rtl;
  background: #f8fafd;
}

.field input:focus { border-color: var(--color-accent); background: var(--color-surface); }
.field input.error { border-color: #e53935; }

.field-note {
  background: #fff8e1;
  border-right: 4px solid #ffc107;
  border-radius: 8px;
  padding: clamp(8px, 1.2vh, 14px) clamp(12px, 1.5vw, 18px);
  font-size: clamp(24px, 3vh, 30px);
  color: #5d4037;
  margin-top: clamp(6px, 0.9vh, 10px);
  line-height: 1.65;
}
.field-note strong { color: var(--color-highlight); }

.error-msg { font-size: clamp(24px, 2.8vh, 28px); color: #e53935; margin-top: 5px; display: none; }
.error-msg.show { display: block; }

.btn-login {
  width: 100%;
  padding: clamp(14px, 2.2vh, 22px);
  background: linear-gradient(135deg, var(--color-primary-deep), var(--color-accent));
  color: var(--color-on-primary);
  border: none;
  border-radius: 13px;
  font-size: clamp(34px, 4.4vh, 44px);
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
  margin-top: clamp(4px, 0.6vh, 8px);
  letter-spacing: 1px;
  transition: opacity 0.2s, transform 0.15s;
}
.btn-login:hover  { opacity: 0.9; transform: translateY(-2px); }
.btn-login:active { transform: translateY(0); }

/* ══════════════════════════════════════════════
   NAV — top bar
══════════════════════════════════════════════ */
.topbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 20px;
  height: 72px;
  background: var(--color-surface);
  box-shadow: 0 2px 10px rgba(0,0,0,0.09);
  flex-shrink: 0;
  z-index: 10;
}

#btn-back {
  background: var(--color-chip-bg);
  border: none;
  border-radius: 10px;
  padding: 9px 18px;
  font-size: clamp(26px, 3.4vh, 30px);
  color: var(--color-primary);
  cursor: pointer;
  font-family: inherit;
  font-weight: 600;
  transition: background 0.15s;
  white-space: nowrap;
  flex-shrink: 0;
}
#btn-back:hover    { background: var(--color-chip-hover); }
#btn-back:disabled { opacity: 0.3; cursor: default; pointer-events: none; }

#breadcrumb {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 4px;
  font-size: clamp(15px, 1.9vh, 19px);
  color: var(--color-text-muted);
  overflow: hidden;
  direction: rtl;
}

#breadcrumb .bc-sep     { color: var(--color-border); flex-shrink: 0; }
#breadcrumb .bc-item    { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
#breadcrumb .bc-current { color: var(--color-primary); font-weight: 600; white-space: nowrap; }

#student-chip {
  background: var(--color-chip-bg);
  border-radius: 20px;
  padding: 7px 18px;
  font-size: clamp(24px, 3vh, 28px);
  color: var(--color-primary);
  font-weight: 600;
  white-space: nowrap;
  max-width: 240px;
  overflow: hidden;
  text-overflow: ellipsis;
  flex-shrink: 0;
}

#btn-change-student {
  background: #fff3e0;
  border: none;
  border-radius: 10px;
  padding: 7px 14px;
  font-size: clamp(20px, 2.4vh, 24px);
  color: var(--color-highlight);
  cursor: pointer;
  font-family: inherit;
  font-weight: 600;
  transition: background 0.15s;
  white-space: nowrap;
  flex-shrink: 0;
}
#btn-change-student:hover { background: #ffe0b2; }

/* اسم الطالب زرٌّ بقائمة منسدلة (رقم · صف · إحصائيات · خروج) — أغنى عن زرّ «تغيير» المستقل */
#btn-change-student { display: none; }

.student-menu-wrap {
  position: relative;
  display: flex;
  align-items: center;
  gap: 5px;
  cursor: pointer;
  flex-shrink: 0;
  user-select: none;
}
.student-menu-wrap #student-chip { cursor: pointer; }
.student-menu-caret {
  color: var(--color-primary);
  font-size: clamp(14px, 1.8vh, 18px);
  line-height: 1;
  transition: transform 0.18s;
}
.student-menu-wrap.open .student-menu-caret { transform: rotate(180deg); }

.student-menu {
  position: absolute;
  top: calc(100% + 8px);
  inset-inline-end: 0;
  min-width: 240px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-pop);
  padding: 8px;
  z-index: 200;
  display: none;
}
.student-menu.open { display: block; }
.student-menu-info {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  padding: 7px 12px;
  font-size: var(--fs-sm);
}
.student-menu-info .k { color: var(--color-text-muted); font-weight: 600; }
.student-menu-info .v { color: var(--color-text); font-weight: 800; }
.student-menu-sep { height: 1px; background: var(--color-border); margin: 6px 4px; }
.student-menu-item {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 10px 12px;
  border: none;
  background: transparent;
  font-family: inherit;
  font-size: var(--fs-sm);
  font-weight: 700;
  color: var(--color-text);
  cursor: pointer;
  border-radius: var(--radius);
  text-align: start;
}
.student-menu-item:hover { background: var(--color-surface-alt); }
.student-menu-item.danger { color: var(--color-highlight); }

/* شبكة إحصائيات الطالب داخل حوار التطبيق */
.stats-grid { display: flex; flex-direction: column; gap: 4px; text-align: start; }
.stats-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding: 9px 4px;
  border-bottom: 1px solid var(--color-border);
}
.stats-row:last-child { border-bottom: none; }
.stats-k { color: var(--color-text); font-weight: 700; }
.stats-v { color: var(--color-primary-deep); font-weight: 800; white-space: nowrap; }

.topbar-stats {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.stat-item {
  font-size: clamp(20px, 2.6vh, 24px);
  color: var(--color-primary);
  font-weight: 600;
  white-space: nowrap;
  background: var(--color-chip-bg);
  padding: 5px 14px;
  border-radius: 16px;
}

.stat-item span {
  color: var(--color-highlight);
}

/* ── Scrollable area ── */
.nav-content {
  flex: 1;
  overflow-y: auto;
  background: var(--color-bg);
  padding: 18px 24px 28px;
}

/* activity screen manages its own scroll — disable nav-content scroll */
#screen-nav.active:has(#ns-activity.active) .nav-content {
  overflow: hidden;
  padding: 0;
}

.nav-screen        { display: none; }
.nav-screen.active { display: block; }

/* ── Section heading ── */
.section-head { text-align: center; margin-bottom: 16px; }

.level-tag {
  display: inline-block;
  background: var(--color-chip-bg);
  color: #1565c0;
  font-size: clamp(17px, 2.4vh, 22px);
  font-weight: 700;
  letter-spacing: 1px;
  padding: 4px 16px;
  border-radius: 20px;
  margin-bottom: 8px;
}

.section-head h1 {
  font-size: clamp(44px, 7vh, 64px);
  font-weight: 700;
  color: var(--color-primary-deep);
}

.section-head p {
  font-size: clamp(28px, 3.6vh, 32px);
  color: var(--color-text-muted);
  margin-top: 6px;
}

/* ── Cards grid ── */
.cards-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
}

/* ── Card ── */
.card {
  background: var(--color-surface);
  border-radius: 18px;
  padding: 22px 18px 18px;
  flex: 0 1 320px;
  box-shadow: 0 2px 12px rgba(13,71,161,0.08);
  cursor: pointer;
  transition: transform 0.18s, box-shadow 0.18s;
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 28px rgba(13,71,161,0.16);
}

.card-locked {
  opacity: 0.52;
  cursor: default;
  pointer-events: none;
}

.card-locked .card-accent {
  background: #b0bec5;
}

.card-locked .card-icon {
  filter: grayscale(1);
}

.card-accent {
  position: absolute;
  top: 0; right: 0; left: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary-deep), var(--color-accent));
}

.card-icon     { font-size: clamp(3.25rem, 7.6vh, 4.4rem); line-height: 1; margin-top: 4px; }
.card-title    { font-size: clamp(32px, 4.4vh, 38px); font-weight: 700; color: var(--color-primary-deep); }
.card-subtitle { font-size: clamp(26px, 3.2vh, 30px); color: var(--color-text-muted); line-height: 1.5; }

.card-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 4px;
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 14px;
  border-radius: 20px;
  font-size: clamp(17px, 2.4vh, 22px);
  font-weight: 600;
}

.badge-video    { background: #e3f2fd; color: #1565c0; }
.badge-exercise { background: #f3e5f5; color: #7b1fa2; }
.badge-duration { background: #fff3e0; color: var(--color-highlight); }

.card-count {
  font-size: clamp(18px, 2.6vh, 24px);
  color: var(--color-text-muted);
  margin-top: 2px;
}

/* ══════════════════════════════════════════════
   أ169: تذييلات بطاقات التقييم (المحطات/الدروس/الوحدات) + رمز الدرس
══════════════════════════════════════════════ */
.card-footer {
  margin-top: auto;
  padding-top: 12px;
  border-top: 1.5px dashed var(--color-border);
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: center;
}
.card-footer-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  justify-content: center;
}
.card-donuts {
  display: flex;
  gap: 22px;
  justify-content: center;
  align-items: flex-start;
}

.completion-mark {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: clamp(18px, 2.4vh, 22px);
  font-weight: 800;
  color: var(--color-correct-text);
}
.completion-check {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.5em; height: 1.5em;
  border-radius: 50%;
  background: var(--color-correct-bg);
  color: var(--color-correct-text);
  font-weight: 900;
}

.card-note {
  font-size: clamp(16px, 2.2vh, 21px);
  font-weight: 700;
  color: var(--color-text-muted);
}

/* شريط تقدّم الأنشطة المنجَزة (رسمٌ بيانيّ أفقيّ للنسبة المئوية) */
.progress-bar {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 6px;
  --bar-color: var(--color-primary);
}
.progress-bar.band-good { --bar-color: var(--color-correct); }
.progress-bar.band-mid  { --bar-color: var(--color-highlight); }
.progress-bar.band-low  { --bar-color: var(--color-primary); }
.progress-bar-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
}
.progress-bar-label {
  font-size: clamp(14px, 1.9vh, 18px);
  font-weight: 700;
  color: var(--color-text-muted);
}
.progress-bar-value {
  font-size: clamp(15px, 2.1vh, 20px);
  font-weight: 800;
  color: var(--color-text);
}
.progress-bar-track {
  width: 100%;
  height: 12px;
  border-radius: 999px;
  background: var(--color-surface-alt);
  border: 1.5px solid var(--color-border);
  overflow: hidden;
}
.progress-bar-fill {
  height: 100%;
  border-radius: 999px;
  background: var(--bar-color);
  transition: width .4s ease;
  min-width: 0;
}

.mastery-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 20px;
  font-weight: 800;
  background: var(--color-surface-alt);
  border: 1.5px solid var(--color-border);
}
.mastery-pill-label {
  font-size: clamp(15px, 2vh, 19px);
  color: var(--color-text-muted);
  font-weight: 700;
}
.mastery-pill-value {
  font-size: clamp(19px, 2.6vh, 24px);
  color: var(--color-text);
}
.mastery-pill.band-good { background: var(--color-correct-bg); border-color: var(--color-correct); }
.mastery-pill.band-good .mastery-pill-value { color: var(--color-correct-text); }
.mastery-pill.band-mid  { background: #fff3e0; border-color: var(--color-highlight); }
.mastery-pill.band-mid  .mastery-pill-value { color: var(--color-highlight); }
.mastery-pill.band-low  { background: var(--color-wrong-bg); border-color: var(--color-wrong); }
.mastery-pill.band-low  .mastery-pill-value { color: var(--color-wrong-text); }

.btn-redo, .btn-lesson-qr {
  font-family: inherit;
  cursor: pointer;
  font-weight: 800;
  border-radius: var(--radius);
  padding: 6px 16px;
  font-size: clamp(15px, 2vh, 19px);
  background: var(--color-surface);
  border: 2px solid var(--color-primary);
  color: var(--color-primary-deep);
  transition: background 0.15s, color 0.15s;
}
.btn-redo:hover, .btn-lesson-qr:hover {
  background: var(--color-primary);
  color: #fff;
}

/* رمز QR لكلّ درس — تُبنى النافذة ديناميكياً في app.js (بلا تعديل index.html) */
.lesson-qr-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.55);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.lesson-qr-overlay.active { display: flex; }
.lesson-qr-box {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 24px 28px;
  max-width: 92vw;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  box-shadow: var(--shadow-pop);
  text-align: center;
}
.lesson-qr-name  {
  font-size: clamp(24px, 3.4vh, 32px); font-weight: 900; color: var(--color-text);
  max-width: 42ch; line-height: 1.3;
}
.lesson-qr-grade {
  font-size: clamp(15px, 2vh, 19px); font-weight: 700; color: var(--color-text-muted);
  margin-top: -6px;
}
.lesson-qr-title { font-size: clamp(22px, 3vh, 28px); font-weight: 800; color: var(--color-primary-deep); }
.lesson-qr-sub   { font-size: clamp(15px, 2vh, 19px); color: var(--color-text-muted); max-width: 42ch; line-height: 1.5; }
.lesson-qr-code  { width: min(300px, 70vw); }
.lesson-qr-code svg { width: 100%; height: auto; display: block; }
.lesson-qr-hint  { font-size: clamp(14px, 1.9vh, 18px); color: var(--color-text); }
.lesson-qr-close {
  font-family: inherit; cursor: pointer; margin-top: 4px;
  padding: 8px 26px; border: none; border-radius: var(--radius);
  background: var(--color-primary); color: #fff; font-weight: 800;
  font-size: clamp(16px, 2.1vh, 20px);
}

/* متصفّح رموز الدروس (Ctrl×3): سهمان حول الصندوق + مؤشّر الموضع */
.lesson-qr-nav {
  display: flex;
  align-items: center;
  gap: clamp(10px, 2vw, 26px);
}
.qr-nav-arrow {
  font-family: inherit; cursor: pointer; flex-shrink: 0;
  width: clamp(48px, 7vh, 66px); height: clamp(48px, 7vh, 66px);
  border: none; border-radius: 50%;
  background: var(--color-surface); color: var(--color-primary-deep);
  box-shadow: var(--shadow-card);
  font-size: clamp(26px, 3.4vh, 34px); line-height: 1; font-weight: 800;
  display: flex; align-items: center; justify-content: center;
  transition: background 0.15s, transform 0.1s;
}
.qr-nav-arrow:hover:not(:disabled) { background: var(--color-surface-alt); transform: scale(1.06); }
.qr-nav-arrow:disabled { opacity: 0.28; cursor: default; box-shadow: none; }
.lesson-qr-pos {
  font-size: clamp(14px, 1.9vh, 18px); font-weight: 700;
  color: var(--color-text-muted);
}

/* ══════════════════════════════════════════════
   ACTIVITY VIEWER — two-column layout
══════════════════════════════════════════════ */

/* Activity screen: full-height flex column */
#ns-activity.active {
  height: 100%;
  display: flex;
  flex-direction: column;
}

/* Progress strip */
.activity-progress {
  text-align: center;
  padding: 8px 24px 6px;
  flex-shrink: 0;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
}

.progress-dots {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-bottom: 4px;
}

.progress-dot {
  width: 16px; height: 16px;
  border-radius: 50%;
  background: #d0d9ef;
  transition: background 0.25s, transform 0.25s;
}

.progress-dot.active {
  background: var(--color-primary);
  transform: scale(1.25);
}

.progress-label {
  font-size: clamp(18px, 2.6vh, 24px);
  color: var(--color-text-muted);
  font-weight: 500;
}

/* Activity content — outer theater frame: centers when short, scrolls when tall */
.activity-col-content {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 24px 16px;
  background: var(--color-bg);
}

/* Inner content stage — fixed-width centered column, natural size */
.activity-area {
  width: 100%;
  max-width: var(--stage-w);
  margin: auto;
}

/* Exception: full-bleed activities (maze, 3D scene, drag zone) */
.activity-area.full-bleed {
  max-width: none;
  width: 100%;
  flex: 1;
  min-height: 0;
  margin: 0;
  align-self: stretch;
}

.activity-col-content:has(.activity-area.full-bleed) {
  padding: 0;
  overflow: hidden;
}

/* Content cards */
.av-card {
  background: var(--color-surface);
  border-radius: 14px;
  padding: 18px 20px;
  box-shadow: 0 2px 10px rgba(13,71,161,0.08);
}

.av-card h3 {
  font-size: var(--fs-heading);
  font-weight: 700;
  color: var(--color-primary-deep);
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-bg);
}

.av-card > p {
  font-size: var(--fs-body);
  color: var(--color-text);
  line-height: 1.75;
}

.points-list {
  list-style: none;
  margin-top: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.points-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  background: var(--color-surface-alt);
  border-radius: 10px;
  padding: 10px 16px;
  font-size: var(--fs-body);
  color: var(--color-text);
  line-height: 1.5;
}

.pt-bullet { color: var(--color-accent); font-weight: 700; font-size: clamp(20px, 2.9vh, 27px); line-height: 1.2; flex-shrink: 0; }

/* Q&A */
.qa-list { margin-top: 12px; display: flex; flex-direction: column; gap: 10px; }

.qa-item {
  background: var(--color-surface-alt);
  border-radius: 12px;
  padding: 14px 18px;
  cursor: pointer;
  transition: background 0.15s;
}

.qa-item:hover { background: #eaf0ff; }

.qa-q {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: var(--fs-body);
  font-weight: 600;
  color: var(--color-primary-deep);
}

.qa-marker {
  background: var(--color-primary);
  color: var(--color-on-primary);
  border-radius: 50%;
  width: clamp(23px, 3.1vh, 28.5px); height: clamp(23px, 3.1vh, 28.5px);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: clamp(13px, 1.8vh, 16.5px);
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 1px;
}

.qa-hint { font-size: clamp(13px, 1.8vh, 16.5px); color: var(--color-text-muted); margin-top: 6px; padding-right: 50px; }

.qa-a {
  font-size: var(--fs-sub);
  color: var(--color-correct-text);
  margin-top: 8px;
  padding-right: 50px;
  display: none;
}

.qa-a::before { content: 'ج: '; font-weight: 700; }

.qa-item.open .qa-hint { display: none; }
.qa-item.open .qa-a    { display: block; }

/* ── Bottom navigation bar ── */
.activity-nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 24px;
  background: var(--color-bg);
  border-top: 1px solid var(--color-border);
  gap: 12px;
  flex-shrink: 0;
}

.btn-nav {
  background: var(--color-chip-bg);
  border: none;
  border-radius: 12px;
  padding: clamp(12px, 1.8vh, 18px) clamp(24px, 2.5vw, 36px);
  font-size: clamp(28px, 3.6vh, 32px);
  color: var(--color-primary);
  cursor: pointer;
  font-family: inherit;
  font-weight: 600;
  transition: background 0.15s, transform 0.12s;
  min-width: 140px;
  text-align: center;
}

.btn-nav:hover:not(:disabled)  { background: var(--color-chip-hover); transform: translateY(-1px); }
.btn-nav:active:not(:disabled) { transform: translateY(0); }
.btn-nav:disabled { opacity: 0.3; cursor: default; pointer-events: none; }

.btn-nav.btn-finish {
  background: linear-gradient(135deg, #1b5e20, #388e3c);
  color: var(--color-on-primary);
}
.btn-nav.btn-finish:hover:not(:disabled) { opacity: 0.9; transform: translateY(-1px); }

/* ══════════════════════════════════════════════
   TOPBAR BADGES
══════════════════════════════════════════════ */
#topbar-badges {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
  position: relative;
}

.topbar-badge-counter {
  display: inline-flex;
  align-items: center;
  background: linear-gradient(135deg, #fff8e1, #fff3cd);
  border: 1.5px solid #ffc107;
  color: #b45309;
  border-radius: 20px;
  padding: 5px 14px;
  font-size: clamp(18px, 2.2vh, 22px);
  font-weight: 700;
  white-space: nowrap;
  box-shadow: 0 1px 4px rgba(255,193,7,0.25);
  cursor: pointer;
  font-family: inherit;
}

.topbar-badge-popup {
  display: none;
  flex-direction: column;
  gap: 4px;
  position: absolute;
  top: 100%;
  left: 0;
  margin-top: 6px;
  background: var(--color-surface);
  border-radius: 12px;
  box-shadow: var(--shadow-pop);
  padding: 8px;
  min-width: 220px;
  z-index: 50;
}

.topbar-badge-popup.open { display: flex; }

.topbar-badge-popup-item {
  font-size: clamp(16px, 2vh, 20px);
  color: var(--color-text);
  padding: 6px 10px;
  border-radius: 8px;
  white-space: nowrap;
}

/* ══════════════════════════════════════════════
   BADGE CELEBRATION OVERLAY
══════════════════════════════════════════════ */
.badge-celebration-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.65);
  z-index: 2000;
  align-items: center;
  justify-content: center;
}

.badge-celebration-overlay.active {
  display: flex;
}

.badge-celebration-card {
  background: var(--color-surface);
  border-radius: 24px;
  padding: 40px 36px;
  text-align: center;
  max-width: 420px;
  width: 90%;
  box-shadow: 0 24px 80px rgba(0,0,0,0.4);
  animation: badge-pop 0.45s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes badge-pop {
  from { transform: scale(0.6); opacity: 0; }
  to   { transform: scale(1);   opacity: 1; }
}

.celebration-fireworks {
  font-size: clamp(2.25rem, 5.2vh, 3rem);
  margin-bottom: 8px;
}

.celebration-icon {
  font-size: clamp(3.75rem, 8.6vh, 5rem);
  line-height: 1;
  margin-bottom: 12px;
}

.celebration-badge-label {
  font-size: clamp(18px, 2.2vh, 22px);
  font-weight: 700;
  color: var(--color-text-muted);
  letter-spacing: 2px;
  margin-bottom: 8px;
}

.celebration-title {
  font-size: clamp(28px, 3.6vh, 36px);
  font-weight: 700;
  color: var(--color-primary-deep);
  margin-bottom: 14px;
}

.celebration-msg {
  font-size: clamp(22px, 2.8vh, 28px);
  color: var(--color-text);
  line-height: 1.6;
  margin-bottom: 28px;
}

.celebration-btn {
  background: linear-gradient(135deg, var(--color-primary-deep), var(--color-accent));
  color: var(--color-on-primary);
  border: none;
  border-radius: 14px;
  padding: 14px 40px;
  font-size: clamp(24px, 3vh, 30px);
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
  transition: opacity 0.2s, transform 0.15s;
}

.celebration-btn:hover  { opacity: 0.9; transform: translateY(-2px); }
.celebration-btn:active { transform: translateY(0); }

/* ══════════════════════════════════════════════
   UNIT CERTIFICATE — شهادة الوحدة (طبقة محقونة من app.js)
══════════════════════════════════════════════ */
/* خطّ Tajawal — للشهادة فقط، مضمَّن محلّياً (لا طلبات شبكة على file://) */
@font-face { font-family:'Tajawal'; font-style:normal; font-weight:400;
  src:url('tajawal-400.woff2') format('woff2'); font-display:swap; }
@font-face { font-family:'Tajawal'; font-style:normal; font-weight:500;
  src:url('tajawal-500.woff2') format('woff2'); font-display:swap; }
@font-face { font-family:'Tajawal'; font-style:normal; font-weight:700;
  src:url('tajawal-700.woff2') format('woff2'); font-display:swap; }

/* احتفاليّة الأشرطة المتطايرة عند أول ظهورٍ للشهادة */
.cert-confetti { position:absolute; inset:0; overflow:hidden; pointer-events:none; z-index:5; }
.cert-ribbon {
  position:absolute; top:-6%; border-radius:2px; opacity:.95;
  animation-name:cert-ribbon-fall; animation-timing-function:cubic-bezier(.35,.15,.5,1);
  animation-iteration-count:1; animation-fill-mode:forwards;
}
@keyframes cert-ribbon-fall {
  0%   { transform:translate(0,-12vh) rotate(0deg);            opacity:0; }
  8%   { opacity:1; }
  100% { transform:translate(var(--dx,0), 112vh) rotate(720deg); opacity:.12; }
}

.unit-cert-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.68);
  z-index: 2600;
  align-items: center;
  justify-content: center;
  padding: 2vh 2vw;
  box-sizing: border-box;
}
.unit-cert-overlay.active { display: flex; }

.unit-cert-card {
  background: var(--color-surface);
  border-radius: 22px;
  padding: 22px 22px 18px;
  text-align: center;
  max-width: 940px;
  width: 100%;
  max-height: 96vh;
  overflow: auto;
  box-shadow: 0 24px 80px rgba(0,0,0,0.45);
  animation: badge-pop 0.45s cubic-bezier(0.34, 1.56, 0.64, 1);
  will-change: transform, opacity;
}

.unit-cert-fireworks {
  font-size: clamp(2rem, 4.6vh, 2.75rem);
  margin-bottom: 4px;
}
.unit-cert-heading {
  font-size: clamp(22px, 3vh, 30px);
  font-weight: 800;
  color: var(--color-primary-deep);
  margin-bottom: 14px;
}

.unit-cert-canvas {
  display: block;
  width: min(880px, 100%);
  height: auto;
  margin: 0 auto;
  border-radius: 10px;
  box-shadow: 0 8px 28px rgba(0,0,0,0.22);
}

.unit-cert-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-top: 18px;
}
.unit-cert-btn {
  border: none;
  border-radius: 12px;
  padding: 12px 34px;
  font-size: clamp(18px, 2.4vh, 24px);
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
  transition: opacity 0.2s, transform 0.15s;
  background: var(--color-surface-alt);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}
.unit-cert-btn.save {
  background: linear-gradient(135deg, var(--color-primary-deep), var(--color-accent));
  color: var(--color-on-primary);
  border: none;
}
.unit-cert-btn:hover  { opacity: 0.92; transform: translateY(-2px); }
.unit-cert-btn:active { transform: translateY(0); }

.unit-cert-note {
  margin-top: 12px;
  font-size: clamp(13px, 1.7vh, 16px);
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* «شهاداتي» — قائمة داخل حوار الشِّل */
.certs-empty {
  font-size: clamp(16px, 2.1vh, 20px);
  color: var(--color-text-muted);
  line-height: 1.7;
  text-align: center;
  padding: 10px 4px;
}
.certs-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-height: 50vh;
  overflow: auto;
}
.certs-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 12px 14px;
  text-align: right;
}
.certs-row-title { font-size: clamp(15px, 2vh, 19px); font-weight: 700; color: var(--color-text); }
.certs-row-sub   { font-size: clamp(13px, 1.7vh, 16px); color: var(--color-text-muted); margin-top: 3px; }
.certs-row-btn {
  flex-shrink: 0;
  border: none;
  border-radius: 10px;
  padding: 9px 20px;
  font-size: clamp(14px, 1.9vh, 17px);
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
  background: var(--color-primary);
  color: var(--color-on-primary);
  transition: opacity 0.2s;
}
.certs-row-btn:hover { opacity: 0.9; }

/* ══════════════════════════════════════════════
   CUSTOM DIALOG — يحلّ محلّ alert/confirm/prompt
══════════════════════════════════════════════ */
.app-dialog-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.55);
  z-index: 3000;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.app-dialog-overlay.active { display: flex; }

.app-dialog-box {
  background: var(--color-surface);
  border-radius: 20px;
  padding: 32px 28px 24px;
  width: 100%;
  max-width: 480px;
  box-shadow: 0 24px 64px rgba(0,0,0,0.35);
  animation: dialog-pop 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
  direction: rtl;
  text-align: right;
}

@keyframes dialog-pop {
  from { transform: scale(0.85); opacity: 0; }
  to   { transform: scale(1);   opacity: 1; }
}

.app-dialog-title {
  font-size: var(--fs-sm);
  font-weight: 700;
  color: var(--color-primary-deep);
  margin-bottom: var(--sp-4);
  padding-bottom: var(--sp-3);
  border-bottom: 2px solid var(--color-border);
}

.app-dialog-msg {
  font-size: var(--fs-sub);
  color: var(--color-text);
  line-height: 1.65;
  margin-bottom: var(--sp-6);
}

.app-dialog-btns {
  display: flex;
  gap: var(--sp-3);
  justify-content: flex-end;
}

.app-dialog-btn {
  padding: var(--sp-3) var(--sp-6);
  border: none;
  border-radius: 12px;
  font-size: var(--fs-sm);
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
  transition: opacity 0.15s, transform 0.12s;
  min-width: 110px;
}
.app-dialog-btn:hover  { opacity: 0.88; transform: translateY(-1px); }
.app-dialog-btn:active { transform: translateY(0); }

.app-dialog-btn-confirm {
  background: linear-gradient(135deg, var(--color-primary-deep), var(--color-accent));
  color: var(--color-on-primary);
}

.app-dialog-btn-cancel {
  background: var(--color-surface-alt);
  color: var(--color-text);
  border: 1.5px solid var(--color-border);
}

/* ═══ وضع المعلّم السرّي — كلمة المرور + منتقي الدروس ═══ */
.teacher-pw-wrap { display: flex; flex-direction: column; gap: var(--sp-2); text-align: start; }
.teacher-pw-label { font-size: var(--fs-sm); color: var(--color-text-muted); font-weight: 700; }
.teacher-pw-input {
  font-size: var(--fs-body);
  font-family: inherit;
  padding: 10px 14px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  color: var(--color-text);
  letter-spacing: 3px;
  text-align: center;
}
.teacher-pw-input:focus { outline: none; border-color: var(--color-primary); }
.teacher-pw-err { min-height: 1.2em; font-size: var(--fs-sm); color: var(--color-wrong-text); font-weight: 700; }

.teacher-pick-hint { font-size: var(--fs-sm); color: var(--color-text-muted); margin-bottom: var(--sp-3); text-align: start; }
.teacher-lesson-list { display: flex; flex-direction: column; gap: 4px; max-height: 46vh; overflow-y: auto; text-align: start; }
.teacher-unit-head {
  font-size: var(--fs-sm);
  font-weight: 800;
  color: var(--color-primary-deep);
  padding: var(--sp-2) 4px 2px;
  position: sticky; top: 0;
  background: var(--color-surface);
}
.teacher-lesson-btn {
  display: flex; align-items: center; justify-content: space-between; gap: var(--sp-3);
  width: 100%;
  font-size: var(--fs-sub);
  font-family: inherit;
  color: var(--color-text);
  padding: 9px 12px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  cursor: pointer;
  text-align: start;
  transition: background 0.12s, border-color 0.12s;
}
.teacher-lesson-btn:hover { background: var(--color-surface-alt); border-color: var(--color-primary); }
.teacher-lesson-btn.current { border-color: var(--color-primary); background: var(--color-surface-alt); }
.teacher-cur-tag { font-size: var(--fs-xs); font-weight: 800; color: var(--color-primary-deep); white-space: nowrap; }