/* ── RESET ───────────────────────────────────────────────────────────────── */
*{margin:0;padding:0;box-sizing:border-box}

/* ── CSS VARIABLES ───────────────────────────────────────────────────────── */
:root{
  --purple-light: #667eea;
  --purple-dark:  #764ba2;
  --pink:         #f5576c;
  --pink-light:   #f093fb;
  --correct:      #28a745;
  --wrong:        #dc3545;
  --half:         #ffc107;
  --radius:       12px;
  --shadow:       0 8px 30px rgba(0,0,0,.22),0 0 0 1px rgba(255,255,255,.08);
  --shadow-lg:    0 20px 60px rgba(0,0,0,.35),0 0 0 1px rgba(255,255,255,.12);
  --text:         #1a1a2e;
  --text-muted:   #555;
  --border:       #ddd;
}

/* ── PAGE BACKGROUND ─────────────────────────────────────────────────────── */
body{
  font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Arial,sans-serif;
  background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);
  min-height:100vh;
  padding:20px;
  color:var(--text);
}

.container{max-width:920px;margin:0 auto}


/* ── AUTH SCREEN ─────────────────────────────────────────────────────────── */
#authScreen{display:flex;align-items:center;justify-content:center;min-height:80vh}
.auth-card{
  background:#fff;border-radius:16px;box-shadow:var(--shadow-lg);
  padding:40px 36px;text-align:center;max-width:440px;width:100%;
  border-top:4px solid var(--purple-light);
}
.auth-card h1{
  font-size:30px;font-weight:800;margin-bottom:6px;
  background:linear-gradient(135deg,var(--purple-light),var(--purple-dark));
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;
}
.auth-card .subtitle{color:var(--text-muted);font-size:14px;margin-bottom:24px;line-height:1.5}
.auth-tabs{display:flex;border-bottom:2px solid var(--border);margin-bottom:20px}
.auth-tab{
  flex:1;padding:10px;background:none;border:none;cursor:pointer;
  font-size:14px;font-weight:600;color:var(--text-muted);
  border-bottom:2px solid transparent;margin-bottom:-2px;transition:all .2s;
}
.auth-tab.active{color:var(--purple-light);border-bottom-color:var(--purple-light)}
.auth-field{
  width:100%;padding:11px 14px;background:#f8f9fa;
  border:1.5px solid var(--border);border-radius:8px;
  font-size:15px;margin-bottom:10px;color:var(--text);
  outline:none;transition:border-color .2s;
}
.auth-field:focus{border-color:var(--purple-light)}
.auth-submit{
  width:100%;padding:13px;font-size:16px;font-weight:700;cursor:pointer;margin-top:4px;
  background:linear-gradient(135deg,var(--purple-light),var(--purple-dark));
  color:#fff;border:none;border-radius:8px;
  box-shadow:0 4px 12px rgba(102,126,234,.4);
  transition:transform .15s,box-shadow .15s;
}
.auth-submit:hover{transform:translateY(-2px);box-shadow:0 6px 16px rgba(102,126,234,.5)}
.auth-divider{display:flex;align-items:center;gap:10px;margin:16px 0;color:var(--text-muted);font-size:13px}
.auth-divider::before,.auth-divider::after{content:'';flex:1;height:1px;background:var(--border)}
.google-btn{
  display:flex;align-items:center;justify-content:center;gap:12px;
  background:#fff;border:1.5px solid var(--border);padding:12px 20px;
  border-radius:8px;cursor:pointer;font-size:14px;font-weight:600;
  color:var(--text);width:100%;transition:all .2s;
}
.google-btn:hover{background:#f8f9fa;border-color:#aaa}
.google-btn svg{width:20px;height:20px;flex-shrink:0}
.auth-error{
  color:#dc3545;font-size:13px;margin-top:10px;display:none;text-align:left;
  background:#fff5f5;padding:8px 12px;border-radius:6px;border-left:3px solid #dc3545;
}
.auth-loading{color:var(--purple-light);font-size:13px;margin-top:10px;display:none}

/* ── GUEST / USER BAR ────────────────────────────────────────────────────── */
.guest-banner{
  display:flex;align-items:center;justify-content:space-between;
  background:rgba(0,0,0,.25);backdrop-filter:blur(6px);
  border:1px solid rgba(255,255,255,.2);color:#fff;
  padding:12px 20px;border-radius:var(--radius);margin-bottom:16px;gap:12px;flex-wrap:wrap;
}
.guest-banner p{font-size:14px;font-weight:500;margin:0}
.guest-banner p strong{color:#ffd700}
.guest-sign-in{
  background:#fff;color:var(--purple-dark);border:none;
  padding:8px 18px;border-radius:7px;cursor:pointer;
  font-size:13px;font-weight:700;white-space:nowrap;transition:transform .15s;
  box-shadow:0 2px 8px rgba(0,0,0,.2);
}
.guest-sign-in:hover{transform:translateY(-1px)}
.user-bar{
  display:flex;align-items:center;justify-content:space-between;
  background:rgba(0,0,0,.25);backdrop-filter:blur(6px);
  border:1px solid rgba(255,255,255,.2);
  padding:12px 20px;border-radius:var(--radius);margin-bottom:16px;gap:12px;flex-wrap:wrap;
}
.user-info{display:flex;align-items:center;gap:10px}
.user-avatar{width:34px;height:34px;border-radius:50%;border:2px solid #fff}
.user-name{font-size:15px;font-weight:600;color:#fff}
.user-name span{color:#ffd700}
.sync-status{font-size:12px;color:rgba(255,255,255,.8);display:flex;align-items:center;gap:5px}
.sync-dot{width:7px;height:7px;border-radius:50%;background:rgba(255,255,255,.4);display:inline-block}
.sync-dot.synced{background:#6fdc8c}
.sync-dot.syncing{background:#fda085;animation:pulse .8s infinite alternate}
.signout-btn{
  background:rgba(255,255,255,.15);border:1px solid rgba(255,255,255,.4);
  color:#fff;padding:6px 14px;border-radius:6px;
  cursor:pointer;font-size:13px;font-weight:600;transition:all .2s;
}
.signout-btn:hover{background:rgba(255,255,255,.28);border-color:#fff}

/* ── APP CONTENT ─────────────────────────────────────────────────────────── */
#appContent{display:none}

/* ── HEADER ──────────────────────────────────────────────────────────────── */
.header{
  background:#fff;border-radius:var(--radius);
  box-shadow:var(--shadow);padding:28px 30px;text-align:center;margin-bottom:20px;
  border-top:4px solid var(--purple-light);
}
.header h1{
  font-size:30px;font-weight:800;margin-bottom:6px;
  background:linear-gradient(135deg,var(--purple-light),var(--purple-dark));
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;
}
.header p{color:var(--text-muted);font-size:16px}

/* ── NAV TABS ────────────────────────────────────────────────────────────── */
.view-toggle{display:flex;gap:10px;margin-bottom:20px;flex-wrap:wrap}
.view-btn{
  flex:1;min-width:120px;padding:12px 20px;border-radius:var(--radius);
  border:2px solid rgba(255,255,255,.5);
  background:rgba(0,0,0,.2);backdrop-filter:blur(4px);
  color:#fff;font-size:15px;font-weight:600;cursor:pointer;transition:all .2s;
  text-shadow:0 1px 3px rgba(0,0,0,.3);
}
.view-btn:hover{background:rgba(0,0,0,.32);border-color:#fff}
.view-btn.active{
  background:#fff;color:var(--purple-dark);border-color:#fff;
  box-shadow:0 4px 16px rgba(0,0,0,.2);text-shadow:none;
}

/* ── LEAVE MODAL ─────────────────────────────────────────────────────────── */
#leaveModal{
  display:none;position:fixed;inset:0;background:rgba(0,0,0,.55);
  z-index:1000;align-items:center;justify-content:center;
  backdrop-filter:blur(4px);
}
.leave-modal-inner{
  background:#fff;border-radius:20px;padding:36px 32px;
  max-width:380px;width:90%;text-align:center;
  box-shadow:0 24px 64px rgba(0,0,0,.3),0 0 0 4px rgba(255,255,255,.15);
  border-top:5px solid var(--purple-light);
}
.leave-modal-icon{font-size:36px;margin-bottom:12px}
.leave-modal-title{
  font-size:22px;font-weight:800;color:var(--text);margin-bottom:8px;
}
.leave-modal-text{
  font-size:15px;color:var(--text-muted);line-height:1.6;margin-bottom:28px;
}
.leave-modal-btns{display:flex;gap:12px;justify-content:center}
.leave-modal-stay{
  flex:1;padding:12px;border-radius:10px;
  background:#f0f0f5;border:1.5px solid #ddd;
  color:var(--text);font-size:15px;font-weight:700;cursor:pointer;
  transition:background .15s;
}
.leave-modal-stay:hover{background:#e0e0ec}
.leave-modal-go{
  flex:1;padding:12px;border-radius:10px;border:none;
  background:linear-gradient(135deg,#f5576c,#c0392b);
  color:#fff;font-size:15px;font-weight:700;cursor:pointer;
  box-shadow:0 4px 14px rgba(220,53,69,.4);
  transition:transform .15s,box-shadow .15s;
}
.leave-modal-go:hover{transform:translateY(-2px);box-shadow:0 6px 18px rgba(220,53,69,.5)}

/* ── TOPIC SELECTOR ──────────────────────────────────────────────────────── */
#topicSelector{display:none}
#topicSelector.show{display:block}
.topic-selector{
  background:#fff;border-radius:var(--radius);
  box-shadow:var(--shadow);padding:28px;margin-bottom:20px;
  border-top:4px solid var(--purple-light);
}
.topic-selector h2{
  font-size:20px;font-weight:800;margin-bottom:20px;
  background:linear-gradient(135deg,var(--purple-light),var(--purple-dark));
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;
}
#topicButtons{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}
.topic-btn{
  background:linear-gradient(135deg,var(--purple-light),var(--purple-dark));
  color:#fff;border:none;padding:16px 10px;border-radius:10px;
  cursor:pointer;font-size:14px;font-weight:700;text-align:center;
  transition:transform .15s,box-shadow .15s;
  box-shadow:0 4px 12px rgba(102,126,234,.4);position:relative;
}
.topic-btn:hover{transform:translateY(-3px);box-shadow:0 8px 20px rgba(102,126,234,.5)}
.topic-best{
  position:absolute;top:-8px;left:50%;transform:translateX(-50%);
  background:linear-gradient(135deg,#f6d365,#fda085);
  color:#333;font-size:10px;font-weight:800;
  padding:2px 8px;border-radius:10px;white-space:nowrap;
  box-shadow:0 2px 6px rgba(0,0,0,.2);
}
@media(max-width:600px){#topicButtons{grid-template-columns:repeat(2,1fr)}}

/* ── QUIZ CONTAINER ──────────────────────────────────────────────────────── */
.quiz-container{display:none}
.quiz-container.active{display:block}
.diff-chip{display:inline-block;padding:3px 10px;border-radius:20px;font-size:12px;font-weight:700}
.diff-1{background:rgba(40,167,69,.15);color:#28a745}
.diff-2{background:rgba(255,193,7,.2);color:#856404}
.diff-3{background:rgba(220,53,69,.15);color:#dc3545}
.progress-bar{height:7px;background:#e9ecef;border-radius:4px;margin-bottom:24px;overflow:hidden}
.progress-fill{height:100%;background:linear-gradient(90deg,var(--purple-light),var(--purple-dark));border-radius:4px;transition:width .3s}
.question-text{font-size:18px;font-weight:600;color:var(--text);margin-bottom:20px;line-height:1.5}
.options{display:grid;gap:10px}
.option-btn{
  background:#f8f9fa;border:2px solid var(--border);
  padding:14px 18px;border-radius:8px;cursor:pointer;
  font-size:15px;text-align:left;transition:all .15s;color:var(--text);
  font-weight:500;
}
.option-btn:hover{background:#ede7f6;border-color:var(--purple-light);color:var(--purple-dark)}
.option-btn.correct{background:rgba(40,167,69,.12);border-color:var(--correct);color:#155724;font-weight:700}
.option-btn.incorrect{background:rgba(220,53,69,.1);border-color:var(--wrong);color:#721c24;font-weight:700}
.feedback{margin-top:15px;padding:14px 16px;border-radius:8px;display:none;font-size:14px;line-height:1.6;font-weight:500}
.feedback.show{display:block}
.feedback.correct{background:#d4edda;border-left:4px solid var(--correct);color:#155724}
.feedback.incorrect{background:#f8d7da;border-left:4px solid var(--wrong);color:#721c24}
.next-btn{
  background:linear-gradient(135deg,var(--purple-light),var(--purple-dark));
  color:#fff;border:none;padding:12px 30px;border-radius:8px;cursor:pointer;
  font-size:16px;font-weight:700;margin-top:15px;display:none;
  box-shadow:0 4px 12px rgba(102,126,234,.4);transition:transform .15s,box-shadow .15s;
}
.next-btn.show{display:inline-block}
.next-btn:hover{transform:translateY(-2px);box-shadow:0 6px 16px rgba(102,126,234,.5)}
.restart-btn{
  background:linear-gradient(135deg,var(--pink-light),var(--pink));
  color:#fff;border:none;padding:14px 36px;border-radius:8px;cursor:pointer;
  font-size:16px;font-weight:700;margin-top:20px;
  box-shadow:0 4px 12px rgba(245,87,108,.4);transition:transform .15s;
}
.restart-btn:hover{transform:translateY(-2px)}
.completion-message{text-align:center;padding:30px}
.completion-message h2{
  font-size:28px;font-weight:800;margin-bottom:15px;
  background:linear-gradient(135deg,var(--purple-light),var(--purple-dark));
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;
}
.completion-message p{color:var(--text-muted);font-size:17px;margin-bottom:10px}
.score-display{
  background:linear-gradient(135deg,var(--purple-light),var(--purple-dark));
  color:#fff;border-radius:var(--radius);
  padding:14px 20px;margin-bottom:16px;
  display:flex;align-items:center;gap:20px;flex-wrap:wrap;
  font-size:15px;font-weight:700;
  box-shadow:0 4px 14px rgba(102,126,234,.4);
}
.score-display span{color:#fff;opacity:.95}
.question-card{
  background:#fff;border-radius:var(--radius);
  box-shadow:var(--shadow);padding:28px;margin-bottom:16px;
  border-top:4px solid var(--purple-light);
}
.new-badge-notification{
  background:linear-gradient(135deg,rgba(246,211,101,.2),rgba(253,160,133,.2));
  border:2px solid #fda085;padding:20px;border-radius:var(--radius);
  margin:20px 0;text-align:center;animation:slideIn .5s;
  box-shadow:0 4px 16px rgba(253,160,133,.3);
}
.new-badge-notification h3{font-size:22px;font-weight:800;color:#c0600a;margin-bottom:10px}
.new-badge-notification .badge-icon{font-size:48px}
.new-badge-notification .badge-unlocked-name{color:#fff;font-weight:600;font-size:18px}
.new-badge-notification .badge-unlocked-desc{color:rgba(255,255,255,.9);margin-bottom:10px}

/* ── BLITZ ───────────────────────────────────────────────────────────────── */
.blitz-container{
  background:#fff;border-radius:var(--radius);
  box-shadow:var(--shadow);padding:28px;margin-bottom:16px;display:none;
  border-top:4px solid var(--pink);
}
.blitz-container.active{display:block}
.timer-bar-wrap{height:10px;background:#e9ecef;border-radius:5px;margin-bottom:20px;overflow:hidden}
.timer-bar{height:100%;width:100%;background:linear-gradient(90deg,#667eea,#764ba2);border-radius:5px;transition:width 1s linear,background .5s}
.timer-bar.warning{background:linear-gradient(90deg,#ffc107,#fd7e14)}
.timer-bar.danger{background:linear-gradient(90deg,#fd7e14,#dc3545)}
.blitz-hud{
  background:linear-gradient(135deg,var(--purple-light),var(--purple-dark));
  color:#fff;padding:15px 22px;border-radius:var(--radius);
  margin-bottom:20px;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:10px;
  box-shadow:0 4px 16px rgba(102,126,234,.4);
}
.blitz-hud-item{text-align:center}
.blitz-hud-val{font-size:30px;font-weight:800;line-height:1}
.blitz-hud-label{font-size:11px;opacity:.75;margin-top:3px;text-transform:uppercase;letter-spacing:.05em}
.blitz-hud-timer{font-size:34px;font-weight:900;font-variant-numeric:tabular-nums}
.blitz-hud-timer.warning{color:#ffc107}
.blitz-hud-timer.danger{color:#f87171;animation:pulse .5s infinite alternate}
@keyframes pulse{from{opacity:1}to{opacity:.4}}
.blitz-flash{position:fixed;inset:0;pointer-events:none;z-index:999;opacity:0;transition:opacity .15s}
.blitz-flash.correct{background:rgba(40,167,69,.2)}
.blitz-flash.incorrect{background:rgba(220,53,69,.2)}
.blitz-flash.show{opacity:1}
.blitz-option{
  background:#f8f9fa;border:2px solid var(--border);
  padding:14px 18px;border-radius:8px;cursor:pointer;
  font-size:15px;text-align:left;width:100%;margin-bottom:8px;
  color:var(--text);transition:all .15s;font-weight:500;
}
.blitz-option:hover{background:#ede7f6;border-color:var(--purple-light)}
.blitz-option.correct{background:#d4edda;border-color:var(--correct);color:#155724;font-weight:700;animation:popIn .2s}
.blitz-option.incorrect{background:#f8d7da;border-color:var(--wrong);color:#721c24;font-weight:700;animation:shake .25s}
.blitz-option:disabled{cursor:not-allowed}
@keyframes popIn{0%{transform:scale(.97)}50%{transform:scale(1.02)}100%{transform:scale(1)}}
@keyframes shake{0%,100%{transform:translateX(0)}25%{transform:translateX(-6px)}75%{transform:translateX(6px)}}
.blitz-result-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:20px 0}
.blitz-result-card{border-radius:var(--radius);padding:20px;text-align:center;border:2px solid var(--border)}
.blitz-result-card:nth-child(1){background:#e8eafc;border-color:rgba(102,126,234,.4)}
.blitz-result-card:nth-child(2){background:#d4edda;border-color:rgba(40,167,69,.4)}
.blitz-result-card:nth-child(3){background:#fff3cd;border-color:rgba(255,193,7,.5)}
.blitz-result-val{font-size:44px;font-weight:900;color:var(--purple-dark)}
.blitz-result-label{font-size:13px;color:var(--text-muted);margin-top:4px;font-weight:600}
.new-record{
  background:linear-gradient(135deg,rgba(246,211,101,.25),rgba(253,160,133,.25));
  border:2px solid #fda085;color:#c0600a;border-radius:8px;
  padding:12px 20px;font-size:17px;font-weight:700;margin:10px 0;display:inline-block;
  box-shadow:0 3px 10px rgba(253,160,133,.3);
}
.blitz-history-table{width:100%;border-collapse:collapse;font-size:14px}
.blitz-history-table th{
  background:#f0f0f5;padding:10px 12px;text-align:left;
  color:var(--purple-dark);font-weight:700;border-bottom:2px solid rgba(102,126,234,.2);
}
.blitz-history-table td{padding:9px 12px;border-bottom:1px solid #f0f0f0;color:var(--text);font-weight:500}
.blitz-history-table tr:last-child td{border-bottom:none}
.blitz-history-table tr:hover td{background:#f5f3ff}

/* ── TEACHER DASHBOARD ───────────────────────────────────────────────────── */
.teacher-view{
  background:#fff;border-radius:var(--radius);
  box-shadow:var(--shadow);padding:25px;margin-bottom:20px;display:none;
  border-top:4px solid var(--purple-dark);
}
.teacher-view.show{display:block}
.teacher-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px;flex-wrap:wrap;gap:12px}
.teacher-header h2{
  font-size:22px;font-weight:800;
  background:linear-gradient(135deg,var(--purple-light),var(--purple-dark));
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;
}
.teacher-refresh{
  background:linear-gradient(135deg,var(--purple-light),var(--purple-dark));
  color:#fff;border:none;padding:9px 18px;border-radius:8px;cursor:pointer;
  font-size:14px;font-weight:700;transition:transform .2s;box-shadow:0 3px 8px rgba(102,126,234,.4);
}
.teacher-refresh:hover{transform:translateY(-2px)}
.class-stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:12px;margin-bottom:24px}
.class-stat{
  background:linear-gradient(135deg,#e8eafc,#f0e8f8);
  border:2px solid rgba(102,126,234,.25);border-radius:var(--radius);padding:16px;text-align:center;
}
.class-stat-val{font-size:30px;font-weight:800;color:var(--purple-dark)}
.class-stat-label{font-size:12px;color:var(--text-muted);margin-top:4px;font-weight:600}
.student-table{width:100%;border-collapse:collapse;font-size:14px}
.student-table th{
  background:#f0f0f5;color:var(--purple-dark);
  padding:12px 14px;text-align:left;font-weight:700;font-size:13px;user-select:none;
}
.student-table th.sortable{cursor:pointer;transition:background .15s}
.student-table th.sortable:hover{background:#e0e0f0;color:var(--purple-dark)}
.student-table th.sort-active{color:var(--purple-dark)}
.sort-arrow{margin-left:5px;opacity:.8;font-size:11px}
.student-table th:first-child{border-radius:8px 0 0 0}
.student-table th:last-child{border-radius:0 8px 0 0}
.student-table td{padding:12px 14px;border-bottom:1px solid #eee;vertical-align:middle;color:var(--text);font-weight:500}
.student-table tr:hover td{background:#f5f3ff;cursor:pointer}
.student-table tr.expanded td{background:#f5f3ff}
.student-row-detail{display:none;background:#fafafa}
.student-row-detail.open{display:table-row}
.student-row-detail td{padding:16px 20px;border-bottom:2px solid #e0e0f0}
.detail-inner{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.detail-section h4{color:var(--purple-dark);font-size:13px;font-weight:700;margin-bottom:10px;text-transform:uppercase;letter-spacing:.05em}
.mini-bar{margin-bottom:8px}
.mini-bar-header{display:flex;justify-content:space-between;font-size:12px;margin-bottom:3px;color:var(--text-muted)}
.mini-bar-fill-wrap{height:6px;background:#e9ecef;border-radius:3px;overflow:hidden}
.mini-bar-fill{height:100%;border-radius:3px;background:linear-gradient(90deg,var(--purple-light),var(--purple-dark))}
.teacher-loading{text-align:center;padding:40px;color:var(--text-muted);font-size:16px}
.no-students{text-align:center;padding:40px;color:var(--text-muted)}
.badge-pill{display:inline-block;padding:2px 10px;border-radius:12px;font-size:11px;font-weight:700}
.badge-pill.green{background:#d4edda;color:#155724}
.badge-pill.amber{background:#fff3cd;color:#856404}
.badge-pill.red{background:#f8d7da;color:#721c24}

/* ── STUDENT DASHBOARD ───────────────────────────────────────────────────── */
#dashboard{display:none}
#dashboard.show{display:block}

.dashboard{
  background:#fff;border-radius:var(--radius);
  box-shadow:var(--shadow);padding:28px;margin-bottom:16px;
}
.dashboard h2{
  font-size:22px;font-weight:800;color:var(--text);margin-bottom:20px;
}

/* Stat cards — 4 distinct colours matching the reference */
.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:14px;margin-bottom:28px}
.stat-card{
  color:#fff;padding:22px 18px;border-radius:14px;text-align:center;
  box-shadow:0 4px 14px rgba(0,0,0,.15);
}
.stat-card:nth-child(1){background:linear-gradient(135deg,#667eea,#764ba2)}
.stat-card:nth-child(2){background:linear-gradient(135deg,#f6a94a,#f5576c)}
.stat-card:nth-child(3){background:linear-gradient(135deg,#43c6f5,#3a7bd5)}
.stat-card:nth-child(4){background:linear-gradient(135deg,#c8b8f0,#e0aad8)}
.stat-value{font-size:38px;font-weight:900;line-height:1;margin-bottom:6px}
.stat-label{font-size:13px;font-weight:600;opacity:.9}

/* Badges section */
.badges-section{margin-bottom:28px}
.badges-section h3{font-size:17px;font-weight:800;color:var(--text);margin-bottom:14px}
.badges-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(105px,1fr));gap:12px}
.badge{
  background:#fff;border:1.5px solid #eee;
  border-radius:12px;padding:14px 10px;text-align:center;
  opacity:.5;transition:all .2s;
  box-shadow:0 2px 6px rgba(0,0,0,.05);
}
.badge.unlocked{
  opacity:1;border-color:rgba(102,126,234,.25);
  box-shadow:0 3px 12px rgba(102,126,234,.15);
}
.badge.unlocked:first-child{
  background:linear-gradient(135deg,var(--pink-light),var(--pink));
  border-color:transparent;
  box-shadow:0 4px 14px rgba(245,87,108,.35);
}
.badge.unlocked:first-child .badge-name,
.badge.unlocked:first-child .badge-desc{color:#fff}
.badge-icon{font-size:28px;margin-bottom:6px}
.badge-name{font-size:12px;font-weight:700;color:var(--text);margin-bottom:3px;line-height:1.3}
.badge-desc{font-size:10px;color:var(--text-muted);line-height:1.4}

/* Topic performance */
.topic-performance{margin-bottom:28px}
.topic-performance h3{font-size:17px;font-weight:800;color:var(--text);margin-bottom:14px}
.topic-bar{margin-bottom:12px}
.topic-bar-header{display:flex;justify-content:space-between;font-size:13px;margin-bottom:5px;color:var(--text)}
.topic-bar-name{font-weight:700}
.topic-bar-score{color:var(--text-muted);font-weight:600}
.topic-bar-fill-container{height:9px;background:#f0f0f5;border-radius:5px;overflow:hidden}
.topic-bar-fill{height:100%;background:linear-gradient(90deg,var(--purple-light),var(--purple-dark));border-radius:5px;transition:width .6s}

/* Blitz history */
.blitz-history h3{font-size:17px;font-weight:800;color:var(--text);margin-bottom:14px}
.blitz-history-table{width:100%;border-collapse:collapse;font-size:14px}
.blitz-history-table th{
  background:#f0f0f5;padding:10px 12px;text-align:left;
  color:var(--purple-dark);font-weight:700;border-bottom:2px solid rgba(102,126,234,.2);
}
.blitz-history-table td{padding:9px 12px;border-bottom:1px solid #f0f0f0;color:var(--text);font-weight:500}
.blitz-history-table tr:last-child td{border-bottom:none}
.blitz-history-table tr:hover td{background:#f5f3ff}

/* ── ERROR HUNT ──────────────────────────────────────────────────────────── */
#errorHuntView{display:none}

/* HUD bar — found / missed / score */
.eh-hud{
  background:#fff;border-radius:var(--radius);
  box-shadow:var(--shadow);padding:16px 24px;margin-bottom:16px;
  display:flex;gap:24px;align-items:center;flex-wrap:wrap;
  border-top:4px solid var(--purple-light);
}
.eh-hud-item{text-align:center;min-width:60px}
.eh-hud-val{font-size:28px;font-weight:800;color:var(--purple-dark);line-height:1}
.eh-hud-val.g{color:var(--correct)}
.eh-hud-val.r{color:var(--wrong)}
.eh-hud-lbl{font-size:11px;font-weight:700;color:var(--text-muted);text-transform:uppercase;letter-spacing:.05em;margin-top:3px}

/* How to play card */
.eh-how{
  background:#fff;border-radius:var(--radius);
  box-shadow:var(--shadow);padding:18px 24px;margin-bottom:16px;
  border-left:4px solid var(--purple-light);
}
.eh-how-title{font-size:13px;font-weight:800;color:var(--purple-dark);text-transform:uppercase;letter-spacing:.06em;margin-bottom:10px}
.eh-steps{display:flex;flex-direction:column;gap:8px}
.eh-step{display:flex;align-items:flex-start;gap:12px;font-size:14px;color:var(--text)}
.eh-step-num{
  background:linear-gradient(135deg,var(--purple-light),var(--purple-dark));
  color:#fff;width:22px;height:22px;border-radius:50%;
  font-size:12px;font-weight:800;display:flex;align-items:center;justify-content:center;flex-shrink:0;
}
.eh-step-text{line-height:1.5;padding-top:2px}
.eh-step-text kbd{
  background:#f0f0f5;border:1px solid #ccc;border-radius:4px;
  padding:1px 6px;font-size:12px;font-family:monospace;
}

/* Type picker row */
.eh-type-row{
  background:#fff;border-radius:var(--radius);
  box-shadow:var(--shadow);padding:14px 24px;margin-bottom:12px;
  display:flex;align-items:center;gap:10px;flex-wrap:wrap;
  border-left:4px solid var(--pink);
}
.eh-type-label{font-size:13px;font-weight:700;color:var(--text-muted);white-space:nowrap}
.eh-type-btn{
  padding:7px 16px;border-radius:20px;font-size:13px;font-weight:700;cursor:pointer;
  border:2px solid var(--border);background:#f0f0f5;color:var(--text);transition:all .15s;
}
.eh-type-btn:hover{background:#ede7f6;border-color:var(--purple-light);color:var(--purple-dark)}
.eh-type-btn.active{background:linear-gradient(135deg,var(--purple-light),var(--purple-dark));color:#fff;border-color:transparent;box-shadow:0 3px 8px rgba(102,126,234,.35)}

/* Generate + action buttons */
.eh-btn-generate{
  padding:10px 22px;border-radius:8px;font-size:14px;font-weight:700;cursor:pointer;border:none;
  background:linear-gradient(135deg,var(--purple-light),var(--purple-dark));
  color:#fff;box-shadow:0 3px 10px rgba(102,126,234,.4);transition:transform .15s,box-shadow .15s;
}
.eh-btn-generate:hover{transform:translateY(-1px);box-shadow:0 5px 14px rgba(102,126,234,.5)}
.eh-actions{
  display:flex;gap:10px;margin-bottom:16px;flex-wrap:wrap;
}
.eh-btn-check{
  padding:10px 22px;border-radius:8px;font-size:14px;font-weight:700;cursor:pointer;border:none;
  background:linear-gradient(135deg,#28a745,#20c057);
  color:#fff;box-shadow:0 3px 10px rgba(40,167,69,.4);transition:transform .15s;
}
.eh-btn-check:hover{transform:translateY(-1px)}
.eh-btn-check:disabled{opacity:.5;cursor:not-allowed;transform:none}
.eh-btn-reset{
  padding:10px 22px;border-radius:8px;font-size:14px;font-weight:700;cursor:pointer;
  background:#e9ecef;border:1.5px solid var(--border);color:var(--text);transition:background .15s;
}
.eh-btn-reset:hover{background:#dee2e6}

/* Essay card */
.eh-essay{
  background:#fff;border-radius:var(--radius);
  box-shadow:var(--shadow);padding:28px 34px;margin-bottom:16px;
  border-left:4px solid var(--purple-light);
  font-family:'Georgia',serif;font-size:17px;line-height:1.9;color:#1a1a2e;user-select:none;
  min-height:80px;
}
.eh-essay p{
  margin-bottom:1.4em;
}
.eh-essay p:last-child{margin-bottom:0}
.eh-title{
  font-size:20px;font-weight:800;margin-bottom:18px;color:var(--purple-dark);
  font-family:-apple-system,sans-serif;
  border-bottom:2px solid #e0e0f0;padding-bottom:12px;
}
/* eh-w is the class used by the essay renderer */
.eh-w{cursor:pointer;transition:background .1s;border-radius:3px;padding:1px 2px}
.eh-w:hover{background:rgba(102,126,234,.15)}
.eh-ann{background:rgba(102,126,234,.18);border-bottom:2px solid var(--purple-light)}
.eh-ok{background:#d4edda;border-bottom:2px solid var(--correct)}
.eh-miss{background:#f8d7da;border-bottom:2px solid var(--wrong)}
.eh-half{background:#fff3cd;border-bottom:2px solid var(--half)}
.eh-first{background:rgba(102,126,234,.3);border-bottom:2px solid var(--purple-light);border-radius:3px}
.eh-sel{background:rgba(102,126,234,.15);border-bottom:2px dashed var(--purple-light);border-radius:3px}

/* Sticky confirm bar — hidden by default, shown via .visible class */
.eh-sticky{
  position:fixed;bottom:0;left:0;right:0;
  background:linear-gradient(135deg,var(--purple-light),var(--purple-dark));
  color:#fff;padding:12px 24px;
  display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-size:14px;font-weight:600;z-index:50;
  box-shadow:0 -4px 20px rgba(0,0,0,.2);
  transform:translateY(100%);
  transition:transform .2s ease;
}
.eh-sticky.visible{transform:translateY(0)}
.eh-sticky-phrase{flex:1}
.eh-sticky-actions{display:flex;gap:10px}
.eh-btn-clear{
  padding:8px 18px;border-radius:7px;font-size:13px;font-weight:700;cursor:pointer;
  background:rgba(255,255,255,.2);border:1px solid rgba(255,255,255,.4);color:#fff;transition:all .15s;
}
.eh-btn-clear:hover{background:rgba(255,255,255,.3)}
.eh-btn-confirm{
  padding:8px 18px;border-radius:7px;font-size:13px;font-weight:700;cursor:pointer;
  background:#fff;border:none;color:var(--purple-dark);transition:all .15s;
  box-shadow:0 2px 8px rgba(0,0,0,.2);
}
.eh-btn-confirm:hover{transform:translateY(-1px)}

/* Add bottom padding to errorHuntView so sticky bar never covers buttons */
#errorHuntView{display:none;padding-bottom:80px}

/* Annotations list */
.eh-ann-section{
  background:#fff;border-radius:var(--radius);
  box-shadow:var(--shadow);padding:16px 24px;margin-bottom:16px;
  border-left:4px solid var(--half);
}
.eh-ann-title{font-size:13px;font-weight:700;color:var(--text-muted);margin-bottom:10px;text-transform:uppercase;letter-spacing:.04em}
.eh-ann-list{display:flex;flex-wrap:wrap;gap:8px}
.eh-ann-chip{
  background:#ede7f6;border:1.5px solid rgba(102,126,234,.4);
  border-radius:20px;padding:5px 14px;font-size:13px;font-weight:600;
  color:var(--purple-dark);cursor:pointer;display:flex;align-items:center;gap:6px;transition:all .15s;
}
.eh-ann-chip:hover{background:#d1c4e9;border-color:var(--purple-dark)}
.eh-chip-x{color:#dc3545;font-weight:900;font-size:14px}

/* Results card */
.eh-results{
  background:#fff;border-radius:var(--radius);
  box-shadow:var(--shadow);padding:24px;margin-bottom:16px;display:none;
  border-top:4px solid var(--correct);
}
.eh-results h3{
  font-size:18px;font-weight:800;margin-bottom:16px;
  background:linear-gradient(135deg,var(--correct),#20c057);
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;
}
.eh-score-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-bottom:20px}
.eh-score-box{border-radius:10px;padding:14px;text-align:center;border:2px solid var(--border);background:#fafafa}
.eh-score-val{font-size:32px;font-weight:900;color:var(--purple-dark);line-height:1}
.eh-score-val.g{color:var(--correct)}
.eh-score-val.r{color:var(--wrong)}
.eh-score-val.y{color:#856404}
.eh-score-lbl{font-size:11px;color:var(--text-muted);margin-top:4px;font-weight:600}
.eh-err-list{list-style:none;display:flex;flex-direction:column;gap:10px}
.eh-err-item{
  display:flex;gap:12px;align-items:flex-start;
  background:#fafafa;border-radius:8px;padding:12px 14px;
  border:1.5px solid var(--border);font-size:13px;line-height:1.6;
}
.eh-err-icon{font-size:18px;margin-top:2px;flex-shrink:0}
.eh-err-orig{color:var(--wrong);font-weight:700}
.eh-err-fix{color:var(--correct);font-weight:700}

/* Overlay + popup */
#ehOverlay{
  display:none;position:fixed;inset:0;
  background:rgba(0,0,0,.5);backdrop-filter:blur(3px);
  z-index:200;align-items:center;justify-content:center;
}
#ehPopup{
  background:#fff;border-radius:14px;
  box-shadow:0 16px 48px rgba(0,0,0,.25);padding:22px;
  width:90%;max-width:340px;
  border-top:4px solid var(--purple-light);
}
.eh-pop-head{margin-bottom:14px}
.eh-pop-label{font-size:11px;font-weight:700;color:var(--purple-dark);text-transform:uppercase;letter-spacing:.06em;margin-bottom:6px}
.eh-pop-phrase{font-size:15px;font-weight:700;color:var(--text);margin-bottom:4px;line-height:1.4}
.eh-pop-sub{font-size:13px;color:var(--text-muted);font-weight:500}

/* Error type option buttons */
.eh-pop-opts{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-bottom:14px}
.eh-opt{
  padding:9px 10px;border-radius:8px;font-size:12px;font-weight:700;cursor:pointer;
  border:1.5px solid var(--border);background:#f5f3ff;color:var(--text);
  transition:all .15s;text-align:center;line-height:1.3;
}
.eh-opt:hover{background:#ede7f6;border-color:var(--purple-light);color:var(--purple-dark)}
.eh-opt.picked{
  background:linear-gradient(135deg,var(--purple-light),var(--purple-dark));
  color:#fff;border-color:transparent;
  box-shadow:0 3px 8px rgba(102,126,234,.35);
}

.eh-pop-foot{display:flex;gap:8px}
.eh-pop-cancel{
  flex:1;padding:9px;border-radius:8px;font-size:13px;font-weight:700;cursor:pointer;
  background:#f0f0f5;border:1px solid var(--border);color:var(--text);transition:background .15s;
}
.eh-pop-cancel:hover{background:#e0e0ec}
.eh-pop-remove{
  flex:1;padding:9px;border-radius:8px;font-size:13px;font-weight:700;cursor:pointer;
  background:#f8d7da;border:1.5px solid #dc3545;color:#721c24;transition:all .15s;
  display:none;
}
.eh-pop-remove:hover{background:#dc3545;color:#fff}

/* Annotation list rows */
.eh-ann-row{
  display:flex;align-items:center;gap:10px;
  background:#f5f3ff;border:1.5px solid rgba(102,126,234,.2);
  border-radius:8px;padding:10px 14px;margin-bottom:6px;
  font-size:13px;cursor:pointer;transition:background .15s;
}
.eh-ann-row:hover{background:#ede7f6}
.eh-ann-num{
  background:linear-gradient(135deg,var(--purple-light),var(--purple-dark));
  color:#fff;width:22px;height:22px;border-radius:50%;
  font-size:11px;font-weight:800;display:flex;align-items:center;justify-content:center;flex-shrink:0;
}
.eh-ann-phrase{flex:1;font-weight:700;color:var(--purple-dark)}
.eh-ann-type{
  font-size:11px;font-weight:700;
  background:rgba(102,126,234,.12);color:var(--purple-dark);
  padding:3px 8px;border-radius:10px;white-space:nowrap;
}
.eh-ann-edit{
  padding:4px 10px;border-radius:6px;font-size:11px;font-weight:700;cursor:pointer;
  background:#fff;border:1px solid var(--border);color:var(--text-muted);
  transition:all .15s;white-space:nowrap;
}
.eh-ann-edit:hover{border-color:var(--purple-light);color:var(--purple-dark)}

/* ── ANIMATIONS ──────────────────────────────────────────────────────────── */
@keyframes slideIn{from{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}

/* Loading spinner */
.eh-loading{text-align:center;padding:40px;color:var(--text-muted)}
.eh-loading-spinner{font-size:32px;animation:spin 1s linear infinite;display:inline-block;margin-bottom:10px}
@keyframes spin{to{transform:rotate(360deg)}}