/* ═══════════════════════════════════════════════════
   MathQuest — Grade 5 Cambridge  |  style.css
   Palette: Space adventure, child-friendly, vibrant
═══════════════════════════════════════════════════ */
:root {
  --navy:    #0F172A;
  --navy2:   #1E293B;
  --navy3:   #334155;
  --violet:  #7C3AED;
  --violet2: #6D28D9;
  --violet3: #5B21B6;
  --violetL: #EDE9FE;
  --amber:   #F59E0B;
  --amberL:  #FEF3C7;
  --mint:    #10B981;
  --mintL:   #D1FAE5;
  --coral:   #EF4444;
  --coralL:  #FEE2E2;
  --sky:     #38BDF8;
  --skyL:    #E0F2FE;
  --pink:    #EC4899;
  --pinkL:   #FCE7F3;
  --white:   #FFFFFF;
  --gray50:  #F8FAFC;
  --gray100: #F1F5F9;
  --gray200: #E2E8F0;
  --gray400: #94A3B8;
  --gray600: #475569;
  --gray800: #1E293B;
  --radius:  14px;
  --radius2: 22px;
  --shadow:  0 4px 24px rgba(15,23,42,0.18);
  --shadowS: 0 2px 8px rgba(15,23,42,0.12);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: 'Nunito', sans-serif;
  background: var(--navy);
  color: var(--white);
  min-height: 100vh;
  overflow-x: hidden;
}

/* ── Stars background ─────────────────────────── */
body::before {
  content: '';
  position: fixed; inset: 0;
  background-image:
    radial-gradient(1.5px 1.5px at 10% 15%, rgba(255,255,255,0.6) 0%, transparent 100%),
    radial-gradient(1px 1px at 25% 60%, rgba(255,255,255,0.4) 0%, transparent 100%),
    radial-gradient(2px 2px at 40% 30%, rgba(248,250,252,0.5) 0%, transparent 100%),
    radial-gradient(1px 1px at 55% 75%, rgba(255,255,255,0.35) 0%, transparent 100%),
    radial-gradient(1.5px 1.5px at 70% 20%, rgba(255,255,255,0.55) 0%, transparent 100%),
    radial-gradient(1px 1px at 80% 50%, rgba(255,255,255,0.4) 0%, transparent 100%),
    radial-gradient(2px 2px at 90% 80%, rgba(255,255,255,0.5) 0%, transparent 100%),
    radial-gradient(1px 1px at 15% 85%, rgba(255,255,255,0.3) 0%, transparent 100%),
    radial-gradient(1.5px 1.5px at 60% 45%, rgba(255,255,255,0.45) 0%, transparent 100%),
    radial-gradient(1px 1px at 35% 90%, rgba(255,255,255,0.35) 0%, transparent 100%),
    radial-gradient(1px 1px at 85% 10%, rgba(255,255,255,0.5) 0%, transparent 100%),
    radial-gradient(2px 2px at 5% 40%, rgba(255,255,255,0.4) 0%, transparent 100%);
  pointer-events: none; z-index: 0;
}

#app { position: relative; z-index: 1; }

/* ── Screen system ───────────────────────────── */
.screen { display: none; min-height: 100vh; padding: 0; }
.screen.active { display: flex; flex-direction: column; }

/* ── Typography ──────────────────────────────── */
h1, h2, h3, .display { font-family: 'Fredoka One', cursive; letter-spacing: 0.02em; }

/* ── Cards ───────────────────────────────────── */
.card {
  background: rgba(30, 41, 59, 0.85);
  border: 1.5px solid rgba(124,58,237,0.25);
  border-radius: var(--radius2);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow);
}

.card-light {
  background: rgba(255,255,255,0.96);
  color: var(--navy);
  border-radius: var(--radius2);
  box-shadow: var(--shadow);
}

/* ── Buttons ─────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-family: 'Nunito', sans-serif; font-weight: 800; font-size: 16px;
  border: none; border-radius: 50px; cursor: pointer;
  padding: 13px 28px; transition: all 0.18s ease; text-decoration: none;
  -webkit-tap-highlight-color: transparent;
}
.btn:active { transform: scale(0.96); }
.btn-primary { background: var(--violet); color: var(--white); box-shadow: 0 4px 14px rgba(124,58,237,0.4); }
.btn-primary:hover { background: var(--violet2); box-shadow: 0 6px 20px rgba(124,58,237,0.5); transform: translateY(-1px); }
.btn-amber  { background: var(--amber); color: var(--navy); box-shadow: 0 4px 14px rgba(245,158,11,0.4); }
.btn-amber:hover { filter: brightness(1.08); transform: translateY(-1px); }
.btn-mint   { background: var(--mint); color: var(--white); box-shadow: 0 4px 14px rgba(16,185,129,0.35); }
.btn-ghost  { background: rgba(255,255,255,0.1); color: var(--white); border: 1.5px solid rgba(255,255,255,0.2); }
.btn-ghost:hover { background: rgba(255,255,255,0.18); }
.btn-sm { padding: 8px 18px; font-size: 14px; }
.btn-lg { padding: 16px 36px; font-size: 18px; }
.btn-block { width: 100%; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none !important; }

/* ── Inputs ──────────────────────────────────── */
.input {
  width: 100%;
  padding: 13px 18px;
  font-family: 'Nunito', sans-serif;
  font-size: 16px; font-weight: 600;
  background: rgba(255,255,255,0.07);
  border: 2px solid rgba(255,255,255,0.15);
  border-radius: 12px; color: var(--white);
  outline: none; transition: border 0.15s;
}
.input::placeholder { color: rgba(255,255,255,0.35); }
.input:focus { border-color: var(--violet); background: rgba(124,58,237,0.1); }
.input-light {
  background: var(--gray50);
  border: 2px solid var(--gray200);
  color: var(--navy);
}
.input-light::placeholder { color: var(--gray400); }
.input-light:focus { border-color: var(--violet); }

/* ═══════════════════ LOGIN ════════════════════ */
#screen-login {
  align-items: center; justify-content: center;
  padding: 24px; min-height: 100vh;
}
.login-box {
  width: 100%; max-width: 420px;
  padding: 40px 36px;
}
.login-logo {
  text-align: center; margin-bottom: 28px;
}
.login-logo .planet { font-size: 64px; display: block; animation: float 3s ease-in-out infinite; }
.login-logo h1 { font-size: 38px; color: var(--amber); margin-top: 8px; }
.login-logo p  { font-size: 15px; color: var(--gray400); font-weight: 600; margin-top: 4px; }
.login-tabs { display: flex; background: rgba(255,255,255,0.06); border-radius: 12px; padding: 4px; margin-bottom: 24px; }
.login-tab { flex: 1; padding: 9px; text-align: center; font-weight: 800; font-size: 15px; border-radius: 9px; cursor: pointer; color: var(--gray400); transition: all 0.18s; }
.login-tab.active { background: var(--violet); color: var(--white); }
.form-group { margin-bottom: 16px; }
.form-label { display: block; font-size: 13px; font-weight: 700; color: var(--gray400); margin-bottom: 6px; text-transform: uppercase; letter-spacing: 0.05em; }
.login-mode-toggle { display: flex; align-items: center; gap: 10px; margin-bottom: 20px; }
.toggle-switch { position: relative; width: 46px; height: 26px; cursor: pointer; }
.toggle-switch input { opacity: 0; width: 0; height: 0; }
.toggle-slider { position: absolute; inset: 0; background: var(--navy3); border-radius: 50px; transition: 0.25s; }
.toggle-slider::before { content:''; position:absolute; width:20px;height:20px;left:3px;bottom:3px;background:var(--white);border-radius:50%;transition:.25s; }
.toggle-switch input:checked + .toggle-slider { background: var(--violet); }
.toggle-switch input:checked + .toggle-slider::before { transform: translateX(20px); }
.toggle-label { font-size: 14px; font-weight: 700; color: var(--gray400); }
.mode-badge { font-size: 12px; font-weight: 800; padding: 3px 10px; border-radius: 20px; background: var(--amberL); color: var(--amber); }

/* ═══════════════════ TOPBAR ═══════════════════ */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 20px;
  background: rgba(15,23,42,0.7);
  border-bottom: 1px solid rgba(124,58,237,0.2);
  backdrop-filter: blur(12px);
  position: sticky; top: 0; z-index: 100;
}
.topbar-logo { font-family: 'Fredoka One'; font-size: 22px; color: var(--amber); }
.topbar-user { display: flex; align-items: center; gap: 10px; }
.avatar {
  width: 36px; height: 36px; border-radius: 50%;
  background: linear-gradient(135deg, var(--violet), var(--pink));
  display: flex; align-items: center; justify-content: center;
  font-family: 'Fredoka One'; font-size: 16px; color: var(--white);
  cursor: pointer; flex-shrink: 0;
}
.xp-pill {
  display: flex; align-items: center; gap: 5px;
  background: rgba(245,158,11,0.15); border: 1px solid rgba(245,158,11,0.3);
  border-radius: 20px; padding: 4px 10px;
  font-size: 13px; font-weight: 800; color: var(--amber);
}
.topbar-nav { display: flex; gap: 4px; }
.nav-btn {
  padding: 7px 14px; border-radius: 20px; cursor: pointer;
  font-size: 13px; font-weight: 700; color: var(--gray400);
  border: none; background: transparent; transition: all 0.15s;
  display: flex; align-items: center; gap: 5px;
}
.nav-btn:hover, .nav-btn.active { background: rgba(124,58,237,0.25); color: var(--white); }
.nav-btn .nav-icon { font-size: 16px; }

/* ═══════════════════ HOME / TOPIC MAP ════════════ */
#screen-home { padding-bottom: 40px; }
.home-hero {
  padding: 28px 20px 20px;
  text-align: center;
}
.home-hero h2 { font-size: 26px; color: var(--white); }
.home-hero p  { color: var(--gray400); font-size: 15px; margin-top: 6px; }
.streak-bar {
  display: flex; align-items: center; justify-content: center; gap: 20px;
  padding: 14px 20px; flex-wrap: wrap;
}
.stat-chip {
  display: flex; align-items: center; gap: 8px;
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 20px; padding: 8px 14px;
  font-size: 14px; font-weight: 700;
}
.stat-chip .stat-icon { font-size: 18px; }

/* Topic grid */
.section-title {
  padding: 0 20px; margin-bottom: 14px;
  font-family: 'Fredoka One'; font-size: 22px; color: var(--white);
}
.topics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 14px; padding: 0 20px 20px;
}
.topic-card {
  border-radius: 20px; padding: 20px 16px;
  cursor: pointer; transition: all 0.2s ease;
  position: relative; overflow: hidden;
  display: flex; flex-direction: column; align-items: center; gap: 10px;
  text-align: center; min-height: 150px; justify-content: center;
  border: 2px solid transparent;
}
.topic-card:hover { transform: translateY(-4px) scale(1.03); box-shadow: 0 10px 30px rgba(0,0,0,0.3); }
.topic-card .topic-icon { font-size: 38px; }
.topic-card .topic-name { font-family: 'Fredoka One'; font-size: 16px; line-height: 1.2; }
.topic-card .topic-progress { font-size: 12px; font-weight: 700; opacity: 0.8; }
.topic-card .topic-badge {
  position: absolute; top: 10px; right: 10px;
  font-size: 10px; font-weight: 800;
  padding: 3px 8px; border-radius: 10px;
  background: rgba(255,255,255,0.2); color: white;
}
.topic-card.locked { opacity: 0.5; cursor: default; }
.topic-card.locked:hover { transform: none; }
.progress-ring {
  width: 100%; height: 4px; background: rgba(255,255,255,0.2);
  border-radius: 4px; margin-top: 4px; overflow: hidden;
}
.progress-ring-fill { height: 100%; border-radius: 4px; background: rgba(255,255,255,0.8); transition: width 0.4s ease; }

/* Topic colours */
.topic-c1  { background: linear-gradient(135deg,#7C3AED,#4F46E5); color:#fff; }
.topic-c2  { background: linear-gradient(135deg,#059669,#10B981); color:#fff; }
.topic-c3  { background: linear-gradient(135deg,#D97706,#F59E0B); color:#fff; }
.topic-c4  { background: linear-gradient(135deg,#DC2626,#EF4444); color:#fff; }
.topic-c5  { background: linear-gradient(135deg,#0369A1,#38BDF8); color:#fff; }
.topic-c6  { background: linear-gradient(135deg,#7E22CE,#EC4899); color:#fff; }
.topic-c7  { background: linear-gradient(135deg,#065F46,#34D399); color:#fff; }
.topic-c8  { background: linear-gradient(135deg,#92400E,#F97316); color:#fff; }

/* ═══════════════════ TOPIC DETAIL ════════════════ */
.topic-detail-header {
  padding: 20px; display: flex; align-items: center; gap: 14px;
}
.topic-detail-icon {
  width: 60px; height: 60px; border-radius: 16px;
  display: flex; align-items: center; justify-content: center;
  font-size: 32px; flex-shrink: 0;
}
.topic-detail-info h2 { font-size: 24px; font-family: 'Fredoka One'; }
.topic-detail-info p  { font-size: 14px; color: var(--gray400); }
.back-btn {
  background: none; border: none; color: var(--gray400);
  font-size: 22px; cursor: pointer; padding: 4px 8px; margin-right: 4px;
}
.back-btn:hover { color: var(--white); }

.desc-box {
  margin: 0 20px 20px;
  background: rgba(124,58,237,0.1);
  border: 1.5px solid rgba(124,58,237,0.25);
  border-radius: 16px; padding: 18px;
}
.desc-box h3 { font-family: 'Fredoka One'; font-size: 16px; color: var(--violet); margin-bottom: 8px; }
.desc-box p  { font-size: 14px; color: var(--gray400); line-height: 1.6; }
.example-box {
  margin: 0 20px 20px;
  background: rgba(245,158,11,0.08);
  border: 1.5px solid rgba(245,158,11,0.25);
  border-radius: 16px; padding: 18px;
}
.example-box h3 { font-family: 'Fredoka One'; font-size: 16px; color: var(--amber); margin-bottom: 10px; }
.example-item { font-size: 14px; color: var(--gray400); margin-bottom: 6px; }
.example-item strong { color: var(--white); }

.mode-select {
  padding: 0 20px 20px;
}
.mode-select h3 { font-family: 'Fredoka One'; font-size: 18px; margin-bottom: 14px; }
.mode-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.mode-card {
  padding: 18px 14px; border-radius: 16px; cursor: pointer;
  text-align: center; border: 2px solid transparent;
  transition: all 0.18s; background: rgba(255,255,255,0.05);
}
.mode-card:hover { border-color: var(--violet); background: rgba(124,58,237,0.12); transform: translateY(-2px); }
.mode-card .mode-icon { font-size: 30px; margin-bottom: 8px; }
.mode-card h4 { font-family: 'Fredoka One'; font-size: 16px; margin-bottom: 4px; }
.mode-card p  { font-size: 12px; color: var(--gray400); }

/* ═══════════════════ QUIZ ════════════════════════ */
#screen-quiz { padding: 0; }
.quiz-topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 20px;
  background: rgba(15,23,42,0.8);
  border-bottom: 1px solid rgba(124,58,237,0.2);
}
.quiz-progress-track {
  flex: 1; margin: 0 16px; height: 8px;
  background: rgba(255,255,255,0.12); border-radius: 8px; overflow: hidden;
}
.quiz-progress-fill { height: 100%; background: linear-gradient(90deg,var(--violet),var(--sky)); border-radius: 8px; transition: width 0.3s ease; }
.quiz-num { font-size: 13px; font-weight: 800; color: var(--gray400); white-space: nowrap; }
.timer-pill {
  display: flex; align-items: center; gap: 5px;
  background: rgba(239,68,68,0.15); border: 1px solid rgba(239,68,68,0.3);
  border-radius: 20px; padding: 5px 12px;
  font-size: 14px; font-weight: 800; color: var(--coral);
  white-space: nowrap;
}
.timer-pill.warning { animation: pulse 1s infinite; }

.quiz-body {
  padding: 24px 20px; max-width: 680px; margin: 0 auto; width: 100%;
}
.question-card {
  padding: 28px 24px; margin-bottom: 20px;
  border-radius: 20px;
}
.q-topic-badge {
  display: inline-block; font-size: 12px; font-weight: 800;
  padding: 4px 12px; border-radius: 20px;
  background: rgba(124,58,237,0.2); color: var(--violet);
  margin-bottom: 14px;
}
.q-text {
  font-size: 20px; font-weight: 700; line-height: 1.5;
  color: var(--white); margin-bottom: 8px;
}
.q-image { width: 100%; max-width: 280px; margin: 12px auto; display: block; border-radius: 12px; }

.answer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px; margin-bottom: 16px;
}
.answer-btn {
  padding: 16px 14px; border-radius: 16px;
  border: 2px solid rgba(255,255,255,0.12);
  background: rgba(255,255,255,0.05);
  color: var(--white); font-family: 'Nunito',sans-serif;
  font-size: 16px; font-weight: 700;
  cursor: pointer; transition: all 0.15s;
  text-align: left; display: flex; align-items: center; gap: 10px;
}
.answer-btn:hover:not(:disabled) { border-color: var(--violet); background: rgba(124,58,237,0.18); transform: translateY(-2px); }
.answer-btn .answer-letter {
  width: 28px; height: 28px; border-radius: 50%;
  background: rgba(255,255,255,0.1);
  display: flex; align-items: center; justify-content: center;
  font-size: 13px; font-weight: 800; flex-shrink: 0;
}
.answer-btn.selected  { border-color: var(--violet); background: rgba(124,58,237,0.25); }
.answer-btn.correct   { border-color: var(--mint); background: rgba(16,185,129,0.2); animation: correctPop 0.4s ease; }
.answer-btn.wrong     { border-color: var(--coral); background: rgba(239,68,68,0.18); }
.answer-btn.reveal    { border-color: var(--mint); background: rgba(16,185,129,0.12); }
.answer-btn:disabled  { cursor: default; }

.fill-input-wrap { margin-bottom: 16px; }
.fill-input {
  width: 100%; padding: 16px 20px;
  font-size: 22px; font-weight: 800; text-align: center;
  font-family: 'Fredoka One';
  background: rgba(255,255,255,0.06);
  border: 2px solid rgba(255,255,255,0.15);
  border-radius: 16px; color: var(--white); outline: none;
  transition: border 0.15s;
}
.fill-input:focus { border-color: var(--violet); }
.fill-input.correct { border-color: var(--mint); background: rgba(16,185,129,0.12); }
.fill-input.wrong   { border-color: var(--coral); background: rgba(239,68,68,0.1); }

.quiz-actions { display: flex; gap: 10px; flex-wrap: wrap; }

.feedback-box {
  padding: 16px 18px; border-radius: 16px; margin-bottom: 16px;
  display: none;
}
.feedback-box.show { display: flex; gap: 12px; align-items: flex-start; }
.feedback-box.correct-fb { background: rgba(16,185,129,0.15); border: 1.5px solid rgba(16,185,129,0.35); }
.feedback-box.wrong-fb   { background: rgba(239,68,68,0.12); border: 1.5px solid rgba(239,68,68,0.3); }
.feedback-icon { font-size: 24px; flex-shrink: 0; }
.feedback-text h4 { font-weight: 800; font-size: 16px; margin-bottom: 4px; }
.feedback-text p  { font-size: 14px; color: var(--gray400); line-height: 1.5; }
.feedback-text.correct-fb h4 { color: var(--mint); }
.feedback-text.wrong-fb   h4 { color: var(--coral); }

.hint-box {
  padding: 14px 16px; border-radius: 14px; margin-bottom: 14px;
  background: rgba(245,158,11,0.1); border: 1.5px solid rgba(245,158,11,0.25);
  display: none;
}
.hint-box.show { display: block; }
.hint-box p { font-size: 14px; color: var(--amberL); line-height: 1.5; }
.hint-label { font-family: 'Fredoka One'; font-size: 14px; color: var(--amber); margin-bottom: 4px; }

/* ═══════════════════ PUZZLE / GAME ══════════════ */
.puzzle-wrap { padding: 20px; max-width: 680px; margin: 0 auto; }
.puzzle-card {
  background: rgba(255,255,255,0.04);
  border: 2px solid rgba(124,58,237,0.3);
  border-radius: 20px; padding: 24px; margin-bottom: 16px;
}
.drag-items { display: flex; flex-wrap: wrap; gap: 10px; min-height: 50px; padding: 10px; background: rgba(255,255,255,0.03); border-radius: 12px; border: 2px dashed rgba(255,255,255,0.15); }
.drag-chip {
  padding: 10px 16px; background: linear-gradient(135deg,var(--violet),var(--violet2));
  border-radius: 20px; font-weight: 800; font-size: 16px; cursor: grab;
  user-select: none; transition: all 0.15s; touch-action: none;
}
.drag-chip:active { cursor: grabbing; transform: scale(1.08); }
.drop-zone {
  min-height: 48px; padding: 8px 12px;
  border: 2px dashed rgba(255,255,255,0.2); border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 14px; color: var(--gray400); transition: all 0.15s;
  font-weight: 700;
}
.drop-zone.drag-over { border-color: var(--violet); background: rgba(124,58,237,0.15); }
.drop-zone.filled { border-color: var(--mint); background: rgba(16,185,129,0.1); }

/* Ordering puzzle */
.order-items { display: flex; flex-direction: column; gap: 8px; }
.order-item {
  display: flex; align-items: center; gap: 12px;
  padding: 14px 16px; border-radius: 14px;
  background: rgba(255,255,255,0.05);
  border: 2px solid rgba(255,255,255,0.1);
  cursor: move; font-weight: 700; font-size: 15px;
  transition: all 0.15s;
}
.order-item:hover { border-color: var(--violet); background: rgba(124,58,237,0.1); }
.order-handle { color: var(--gray400); font-size: 18px; }

/* Number line game */
.number-line-wrap { overflow-x: auto; padding: 20px 0; }
.number-line {
  display: flex; align-items: center; position: relative;
  height: 80px; min-width: 500px;
}
.number-line-track {
  height: 6px; background: rgba(255,255,255,0.2);
  border-radius: 6px; flex: 1; position: relative;
}
.nl-tick {
  position: absolute; bottom: 0; transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 4px;
}
.nl-tick-line { width: 2px; height: 16px; background: rgba(255,255,255,0.4); }
.nl-tick-label { font-size: 12px; font-weight: 700; color: var(--gray400); margin-top: 6px; }
.nl-pointer {
  position: absolute; top: -20px; transform: translateX(-50%);
  font-size: 24px; cursor: ew-resize; transition: left 0.15s;
}

/* ═══════════════════ RESULT SCREEN ══════════════ */
#screen-result { align-items: center; justify-content: center; padding: 24px; }
.result-box { max-width: 460px; width: 100%; padding: 40px 32px; text-align: center; }
.result-emoji { font-size: 72px; margin-bottom: 12px; animation: bounceIn 0.6s ease; }
.result-grade { font-family: 'Fredoka One'; font-size: 56px; margin-bottom: 6px; }
.grade-S { color: var(--amber); }
.grade-A { color: var(--mint); }
.grade-B { color: var(--sky); }
.grade-C { color: var(--violet); }
.grade-D { color: var(--coral); }
.result-msg { font-size: 16px; color: var(--gray400); margin-bottom: 24px; }
.result-stats { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 12px; margin-bottom: 28px; }
.result-stat { padding: 16px 10px; border-radius: 16px; background: rgba(255,255,255,0.06); }
.result-stat .rs-num { font-family: 'Fredoka One'; font-size: 28px; }
.result-stat .rs-lbl { font-size: 12px; font-weight: 700; color: var(--gray400); margin-top: 2px; }
.xp-gained {
  display: flex; align-items: center; justify-content: center; gap: 8px;
  padding: 14px; border-radius: 14px; margin-bottom: 24px;
  background: rgba(245,158,11,0.12); border: 1.5px solid rgba(245,158,11,0.3);
  font-family: 'Fredoka One'; font-size: 20px; color: var(--amber);
}
.result-btns { display: flex; flex-direction: column; gap: 10px; }

/* ═══════════════════ LEADERBOARD ════════════════ */
#screen-leaderboard { padding: 0; }
.lb-header { padding: 24px 20px 16px; }
.lb-header h2 { font-family: 'Fredoka One'; font-size: 28px; }
.lb-tabs { display: flex; gap: 8px; padding: 0 20px 16px; }
.lb-tab { padding: 8px 18px; border-radius: 20px; font-size: 14px; font-weight: 800; cursor: pointer; border: 2px solid rgba(255,255,255,0.12); color: var(--gray400); transition: all 0.15s; }
.lb-tab.active { background: var(--violet); border-color: var(--violet); color: var(--white); }
.lb-list { padding: 0 20px 40px; }
.lb-row {
  display: flex; align-items: center; gap: 14px;
  padding: 14px 18px; border-radius: 16px; margin-bottom: 8px;
  background: rgba(255,255,255,0.04);
  border: 1.5px solid rgba(255,255,255,0.06);
  transition: all 0.15s;
}
.lb-row.me { background: rgba(124,58,237,0.15); border-color: rgba(124,58,237,0.4); }
.lb-row.top1 { background: rgba(245,158,11,0.12); border-color: rgba(245,158,11,0.35); }
.lb-rank { font-family: 'Fredoka One'; font-size: 20px; width: 36px; text-align: center; }
.lb-av {
  width: 38px; height: 38px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 18px; flex-shrink: 0;
}
.lb-name { flex: 1; font-weight: 800; font-size: 15px; }
.lb-score { font-family: 'Fredoka One'; font-size: 18px; color: var(--amber); }
.lb-badge { font-size: 11px; font-weight: 700; padding: 2px 8px; border-radius: 10px; background: rgba(124,58,237,0.25); color: var(--violet); }
.podium {
  display: flex; align-items: flex-end; justify-content: center;
  gap: 8px; padding: 0 20px 24px;
}
.podium-spot {
  flex: 1; max-width: 110px; text-align: center; cursor: default;
}
.podium-av { font-size: 32px; margin-bottom: 6px; }
.podium-name { font-size: 13px; font-weight: 800; margin-bottom: 6px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.podium-block {
  border-radius: 12px 12px 0 0;
  display: flex; flex-direction: column; align-items: center;
  justify-content: flex-start; padding-top: 10px;
}
.podium-block.p1 { height: 90px; background: linear-gradient(180deg,rgba(245,158,11,0.5),rgba(245,158,11,0.15)); border: 1.5px solid rgba(245,158,11,0.4); }
.podium-block.p2 { height: 66px; background: linear-gradient(180deg,rgba(148,163,184,0.4),rgba(148,163,184,0.1)); border: 1.5px solid rgba(148,163,184,0.3); }
.podium-block.p3 { height: 50px; background: linear-gradient(180deg,rgba(180,83,9,0.4),rgba(180,83,9,0.1)); border: 1.5px solid rgba(180,83,9,0.3); }
.podium-rank { font-family: 'Fredoka One'; font-size: 22px; }
.podium-pts { font-size: 12px; font-weight: 700; color: var(--gray400); }

/* ═══════════════════ PROGRESS ═══════════════════ */
#screen-progress { padding: 0 0 40px; }
.progress-header { padding: 24px 20px 16px; }
.progress-header h2 { font-family: 'Fredoka One'; font-size: 28px; }
.chart-wrap { padding: 0 20px 20px; }
.chart-card { padding: 20px; border-radius: 20px; background: rgba(255,255,255,0.04); border: 1.5px solid rgba(255,255,255,0.08); }
.chart-title { font-family: 'Fredoka One'; font-size: 16px; color: var(--gray400); margin-bottom: 16px; }
.bar-chart { display: flex; align-items: flex-end; gap: 8px; height: 120px; }
.bar-col { flex: 1; display: flex; flex-direction: column; align-items: center; gap: 4px; height: 100%; justify-content: flex-end; }
.bar-fill { width: 100%; border-radius: 8px 8px 0 0; transition: height 0.6s ease; min-height: 4px; }
.bar-lbl { font-size: 11px; font-weight: 700; color: var(--gray400); }
.bar-val { font-size: 12px; font-weight: 800; color: var(--white); }

.topic-progress-list { padding: 0 20px; }
.tprog-row { display: flex; align-items: center; gap: 12px; padding: 12px 0; border-bottom: 1px solid rgba(255,255,255,0.06); }
.tprog-icon { font-size: 22px; width: 36px; text-align: center; }
.tprog-info { flex: 1; }
.tprog-name { font-weight: 800; font-size: 14px; margin-bottom: 4px; }
.tprog-track { height: 6px; background: rgba(255,255,255,0.1); border-radius: 6px; overflow: hidden; }
.tprog-fill  { height: 100%; border-radius: 6px; background: linear-gradient(90deg,var(--violet),var(--sky)); transition: width 0.4s ease; }
.tprog-pct { font-size: 13px; font-weight: 800; color: var(--amber); width: 40px; text-align: right; }

/* ═══════════════════ SELF-COMPETITION ═══════════ */
.personal-best-banner {
  margin: 0 20px 20px;
  padding: 16px 20px; border-radius: 16px;
  background: rgba(16,185,129,0.1); border: 1.5px solid rgba(16,185,129,0.3);
  display: flex; align-items: center; gap: 14px;
}
.pb-trophy { font-size: 32px; }
.pb-info h4 { font-family: 'Fredoka One'; font-size: 16px; color: var(--mint); }
.pb-info p  { font-size: 13px; color: var(--gray400); }

/* ═══════════════════ MODALS ═════════════════════ */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.6);
  backdrop-filter: blur(4px); z-index: 200;
  display: flex; align-items: center; justify-content: center;
  padding: 20px; opacity: 0; pointer-events: none; transition: opacity 0.2s;
}
.modal-overlay.open { opacity: 1; pointer-events: all; }
.modal {
  max-width: 420px; width: 100%; padding: 32px 28px;
  animation: slideUp 0.25s ease;
}
.modal h3 { font-family: 'Fredoka One'; font-size: 22px; margin-bottom: 12px; }
.modal p  { font-size: 14px; color: var(--gray400); line-height: 1.6; margin-bottom: 20px; }
.modal-close { position: absolute; top: 14px; right: 18px; font-size: 22px; cursor: pointer; color: var(--gray400); background: none; border: none; }

/* ═══════════════════ TOAST ══════════════════════ */
.toast {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%) translateY(80px);
  background: var(--navy2); border: 1.5px solid rgba(255,255,255,0.15);
  border-radius: 20px; padding: 12px 22px;
  font-size: 14px; font-weight: 700; color: var(--white);
  z-index: 300; white-space: nowrap;
  transition: transform 0.3s ease, opacity 0.3s ease;
  opacity: 0;
}
.toast.show { transform: translateX(-50%) translateY(0); opacity: 1; }

/* ═══════════════════ ANIMATIONS ═════════════════ */
@keyframes float { 0%,100%{transform:translateY(0)} 50%{transform:translateY(-10px)} }
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:0.6} }
@keyframes correctPop { 0%{transform:scale(1)} 50%{transform:scale(1.04)} 100%{transform:scale(1)} }
@keyframes bounceIn { 0%{transform:scale(0.5);opacity:0} 70%{transform:scale(1.1)} 100%{transform:scale(1);opacity:1} }
@keyframes slideUp { from{transform:translateY(30px);opacity:0} to{transform:translateY(0);opacity:1} }
@keyframes starPop { 0%{transform:scale(0) rotate(-20deg)} 60%{transform:scale(1.3) rotate(5deg)} 100%{transform:scale(1) rotate(0)} }
.star-pop { animation: starPop 0.4s ease forwards; }
.confetti-piece {
  position: fixed; pointer-events: none; z-index: 400;
  width: 8px; height: 8px; border-radius: 2px;
  animation: confettiFall 1.5s ease forwards;
}
@keyframes confettiFall {
  0%   { transform: translateY(-20px) rotate(0deg); opacity: 1; }
  100% { transform: translateY(100vh) rotate(720deg); opacity: 0; }
}

/* ═══════════════════ RESPONSIVE ═════════════════ */
@media (max-width: 480px) {
  .topics-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; padding: 0 14px 14px; }
  .answer-grid  { grid-template-columns: 1fr; }
  .mode-cards   { grid-template-columns: 1fr 1fr; }
  .result-stats { grid-template-columns: 1fr 1fr 1fr; }
  .login-box    { padding: 28px 22px; }
  .q-text       { font-size: 17px; }
  .topbar-nav   { display: none; }
  .quiz-body    { padding: 16px 14px; }
}
@media (max-width: 360px) {
  .topics-grid { grid-template-columns: 1fr 1fr; gap: 8px; }
  .podium { gap: 4px; }
}

/* ── Utility ─────────────────────────────────── */
.mt8{margin-top:8px} .mt12{margin-top:12px} .mt16{margin-top:16px} .mt20{margin-top:20px}
.mb8{margin-bottom:8px} .mb12{margin-bottom:12px} .mb16{margin-bottom:16px}
.flex{display:flex} .gap8{gap:8px} .gap12{gap:12px} .items-center{align-items:center}
.justify-between{justify-content:space-between} .flex-1{flex:1}
.text-amber{color:var(--amber)} .text-mint{color:var(--mint)} .text-coral{color:var(--coral)}
.text-gray{color:var(--gray400)} .text-sm{font-size:13px} .text-xs{font-size:11px}
.fw800{font-weight:800} .hidden{display:none!important}
.center{text-align:center}