/* ── Variables ──────────────────────────────────────────────────────────── */
:root {
  --primary:    #2563eb;
  --primary-d:  #1d4ed8;
  --success:    #16a34a;
  --success-d:  #15803d;
  --danger:     #dc2626;
  --danger-d:   #b91c1c;
  --warn:       #d97706;
  --warn-d:     #b45309;
  --orange:     #ea580c;
  --green:      #059669;
  --bg:         #f1f5f9;
  --surface:    #ffffff;
  --text:       #0f172a;
  --text-2:     #475569;
  --text-3:     #94a3b8;
  --border:     #e2e8f0;
  --sh-sm:      0 1px 3px rgba(0,0,0,.10);
  --sh:         0 4px 6px rgba(0,0,0,.07);
  --sh-lg:      0 10px 15px rgba(0,0,0,.10);
  --r:          12px;
  --r-sm:       8px;
  --t:          .15s ease;
}

/* ── Reset ──────────────────────────────────────────────────────────────── */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:16px;-webkit-tap-highlight-color:transparent}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;
  background:var(--bg);color:var(--text);min-height:100vh;line-height:1.5}
a{color:inherit;text-decoration:none}
button{cursor:pointer;font:inherit;border:none;background:none}
input{font:inherit}

/* ── Topbar ──────────────────────────────────────────────────────────────── */
.topbar{background:var(--primary);color:#fff;height:54px;display:flex;
  align-items:center;padding:0 16px;gap:10px;position:sticky;top:0;
  z-index:100;box-shadow:var(--sh-sm)}
.topbar-brand{font-weight:700;font-size:1.05rem;flex:1;color:#fff}
.topbar-nav{display:flex;gap:4px;align-items:center}
.nav-link{color:rgba(255,255,255,.85);font-size:.88rem;padding:6px 10px;
  border-radius:var(--r-sm);transition:background var(--t)}
.nav-link:hover{background:rgba(255,255,255,.15);color:#fff}
.nav-logout{color:rgba(255,255,255,.6)}

/* ── Layout ──────────────────────────────────────────────────────────────── */
.main-content{padding-bottom:40px}
.page-wrap{max-width:720px;margin:0 auto;padding:20px 16px}
.page-header{margin-bottom:24px}
.page-title{font-size:1.4rem;font-weight:700;margin-top:4px}
.page-sub{color:var(--text-2);font-size:.93rem;margin-top:4px}
.back-link{color:var(--primary);font-size:.9rem;display:inline-block;margin-bottom:4px}
.section{margin-bottom:28px}
.section-title{font-size:.82rem;font-weight:700;color:var(--text-2);
  text-transform:uppercase;letter-spacing:.06em;margin-bottom:12px}
.hidden{display:none!important}

/* ── Buttons ──────────────────────────────────────────────────────────────── */
.btn{display:inline-flex;align-items:center;justify-content:center;
  padding:12px 20px;border-radius:var(--r);font-weight:600;font-size:.95rem;
  transition:background var(--t),transform var(--t),box-shadow var(--t);
  min-height:48px;white-space:nowrap;gap:6px}
.btn:active{transform:scale(.97)}
.btn-full{width:100%;display:flex}
.btn-large{min-height:56px;font-size:1.05rem}
.btn-sm{min-height:36px;padding:6px 14px;font-size:.88rem}
.btn-primary{background:var(--primary);color:#fff;box-shadow:0 2px 8px rgba(37,99,235,.25)}
.btn-primary:hover{background:var(--primary-d)}
.btn-success{background:var(--success);color:#fff}
.btn-success:hover{background:var(--success-d)}
.btn-danger{background:var(--danger);color:#fff}
.btn-danger:hover{background:var(--danger-d)}
.btn-warn{background:var(--warn);color:#fff}
.btn-warn:hover{background:var(--warn-d)}
.btn-outline{border:2px solid var(--primary);color:var(--primary);background:transparent}
.btn-outline:hover{background:rgba(37,99,235,.06)}
.btn-ghost{color:var(--text-2);background:transparent}
.btn-ghost:hover{background:var(--border)}
.btn:disabled{opacity:.45;pointer-events:none}

/* ── Auth ────────────────────────────────────────────────────────────────── */
.auth-wrap{min-height:100vh;display:flex;align-items:center;
  justify-content:center;padding:24px 16px}
.auth-card{background:var(--surface);border-radius:var(--r);
  box-shadow:var(--sh-lg);padding:32px 28px;width:100%;max-width:420px}
.auth-title{font-size:1.7rem;font-weight:800;text-align:center;color:var(--primary)}
.auth-sub{text-align:center;color:var(--text-2);font-size:.9rem;margin:4px 0 24px}
.tab-bar{display:flex;background:var(--bg);border-radius:var(--r-sm);
  padding:4px;margin-bottom:20px}
.tab-btn{flex:1;padding:9px;border-radius:calc(var(--r-sm) - 2px);font-weight:600;
  font-size:.9rem;color:var(--text-2);transition:all var(--t)}
.tab-btn.active{background:var(--surface);color:var(--primary);box-shadow:var(--sh-sm)}
.auth-form{display:flex;flex-direction:column;gap:16px}
.field{display:flex;flex-direction:column;gap:6px}
.field label{font-size:.88rem;font-weight:600;color:var(--text-2)}
.field input{border:2px solid var(--border);border-radius:var(--r-sm);
  padding:12px 14px;font-size:1rem;transition:border-color var(--t);
  background:var(--bg);width:100%}
.field input:focus{outline:none;border-color:var(--primary);background:var(--surface)}
.alert{padding:12px 16px;border-radius:var(--r-sm);font-size:.9rem;margin-bottom:16px}
.alert-error{background:#fef2f2;color:#991b1b;border:1px solid #fecaca}
.auth-extra{margin-top:18px;padding-top:18px;border-top:1px solid var(--bd,var(--border))}
.auth-extra-label{font-size:.8rem;color:var(--text-2);text-align:center;margin-bottom:10px}
.auth-extra-btns{display:flex;gap:10px}
.auth-extra-btns .btn{flex:1}
.quick-links{display:flex;gap:10px;margin-bottom:22px}
.quick-links .btn{flex:1}

/* ── Dashboard ───────────────────────────────────────────────────────────── */
.subject-list{display:flex;flex-direction:column;gap:12px}
.subject-card{background:var(--surface);border-radius:var(--r);padding:16px;
  box-shadow:var(--sh-sm);border:1px solid var(--border)}
.subject-card-all{background:linear-gradient(135deg,#eff6ff,#f5f3ff);
  border:1px solid #c7d2fe}
.subject-top{margin-bottom:12px}
.subject-name{font-weight:700;font-size:1.02rem}
.subject-meta{font-size:.83rem;color:var(--text-2);margin-top:3px}
.subject-modes{display:flex;flex-wrap:wrap;gap:8px}

/* Mode buttons */
.mode-btn{display:inline-flex;align-items:center;gap:5px;
  padding:8px 14px;border-radius:var(--r-sm);font-size:.88rem;
  font-weight:600;min-height:38px;transition:all var(--t);border:none;cursor:pointer}
.mode-btn:active{transform:scale(.96)}
.mode-btn-primary{background:rgba(37,99,235,.1);color:var(--primary)}
.mode-btn-primary:hover{background:rgba(37,99,235,.18)}
.mode-btn-green{background:rgba(5,150,105,.1);color:var(--green)}
.mode-btn-green:hover{background:rgba(5,150,105,.18)}
.mode-btn-orange{background:rgba(234,88,12,.1);color:var(--orange)}
.mode-btn-orange:hover{background:rgba(234,88,12,.18)}
.mode-btn-red{background:rgba(220,38,38,.1);color:var(--danger)}
.mode-btn-red:hover{background:rgba(220,38,38,.18)}
.mode-icon{font-size:1rem;line-height:1}

/* Legend */
.mode-legend{background:var(--surface);border:1px solid var(--border);
  border-radius:var(--r);padding:14px 16px;display:flex;flex-direction:column;gap:6px}
.legend-item{font-size:.86rem;color:var(--text-2);display:flex;align-items:center;gap:8px}
.legend-item b{color:var(--text)}

/* Continue card */
.card-continue{background:#fffbeb;border:1px solid #fde68a;border-radius:var(--r);
  padding:14px 16px;display:flex;align-items:center;gap:12px;margin-bottom:20px}
.card-continue-text{flex:1}
.card-continue-text p{font-size:.9rem;color:var(--text-2);margin-top:4px}

.errors-summary-card{background:#fef2f2;border:1px solid #fecaca;
  border-radius:var(--r);padding:20px;display:flex;align-items:center;gap:16px}
.errors-count{font-size:2rem;font-weight:800;color:var(--danger);line-height:1}
.errors-label{font-size:.85rem;color:var(--text-2)}
.errors-actions{display:flex;flex-direction:column;gap:8px;margin-left:auto}

/* ── Badges / Scores ─────────────────────────────────────────────────────── */
.badge{display:inline-block;padding:2px 8px;border-radius:20px;
  font-size:.75rem;font-weight:700;text-transform:uppercase;letter-spacing:.03em}
.badge-error{background:#fef2f2;color:var(--danger);border:1px solid #fecaca}
.badge-warn{background:#fffbeb;color:var(--warn);border:1px solid #fde68a}
.score-good{color:var(--success);font-weight:700}
.score-ok{color:var(--warn);font-weight:700}
.score-bad{color:var(--danger);font-weight:700}

/* ── Test layout ─────────────────────────────────────────────────────────── */
.test-wrap{max-width:720px;margin:0 auto;padding-bottom:48px}
.test-state{padding:0 0 20px}
.center-state{padding:40px 20px;text-align:center;color:var(--text-2)}

/* Spinner */
.spinner{width:40px;height:40px;border:3px solid var(--border);
  border-top-color:var(--primary);border-radius:50%;
  animation:spin .7s linear infinite;margin:0 auto 16px}
@keyframes spin{to{transform:rotate(360deg)}}

/* Progress */
.progress-bar-wrap{height:5px;background:var(--border);position:sticky;top:54px;z-index:10}
.progress-bar{height:100%;background:var(--primary);transition:width .4s ease}
.q-topbar{display:flex;align-items:center;gap:8px;padding:10px 16px 0;flex-wrap:wrap}
.q-progress{font-size:.82rem;color:var(--text-2);flex:1;min-width:0}
.subject-tag{background:var(--primary);color:#fff;font-size:.75rem;font-weight:700;
  padding:3px 10px;border-radius:20px;white-space:nowrap}
.q-exit-btn{font-size:.8rem;padding:4px 10px;min-height:28px;
  color:var(--text-3);border:1px solid var(--border);border-radius:20px;
  flex-shrink:0}
.q-exit-btn:hover{color:var(--danger);border-color:var(--danger);background:transparent}

/* Question card */
.question-card{background:var(--surface);border-radius:var(--r);
  box-shadow:var(--sh);margin:12px 16px 0;overflow:hidden}
.question-number{font-size:.75rem;font-weight:700;color:var(--text-3);
  text-transform:uppercase;letter-spacing:.07em;padding:16px 20px 0}
.question-text{font-size:1.1rem;font-weight:500;line-height:1.65;
  padding:8px 20px 20px;color:var(--text)}

/* ── Картинки в вопросе ──────────────────────────────────────────────────── */
.question-images{padding:0 20px;display:flex;flex-wrap:wrap;gap:10px}
.q-img{max-width:100%;height:auto;border-radius:var(--r-sm);
  background:#fff;border:1px solid var(--border)}
.q-typehint{padding:6px 20px 0;font-size:.8rem;color:var(--text-3)}

/* ── Варианты (single/multi) ─────────────────────────────────────────────── */
.options{padding:12px 16px 4px;display:flex;flex-direction:column;gap:8px}
.opt{display:flex;align-items:flex-start;gap:12px;padding:13px 15px;
  border-radius:var(--r-sm);border:2px solid var(--border);background:var(--bg);
  text-align:left;width:100%;cursor:pointer;transition:all var(--t);font-size:.97rem;
  line-height:1.45}
.opt:hover:not(:disabled){border-color:var(--primary);background:rgba(37,99,235,.05)}
.opt:active:not(:disabled){transform:scale(.99)}
.opt-marker{flex-shrink:0;width:24px;height:24px;border:2px solid var(--text-3);
  background:var(--surface);transition:all var(--t);margin-top:1px}
.opt-marker.rd{border-radius:50%}
.opt-marker.sq{border-radius:6px}
.opt.sel{border-color:var(--primary);background:rgba(37,99,235,.08)}
.opt.sel .opt-marker{border-color:var(--primary);background:var(--primary);
  box-shadow:inset 0 0 0 3px var(--surface)}
.opt-body{display:flex;flex-direction:column;gap:6px;min-width:0;padding-top:1px}
.opt-text{word-break:break-word}
.opt-img{max-width:100%;height:auto;border-radius:6px;background:#fff;
  border:1px solid var(--border)}
.opt-correct{border-color:var(--success)!important;background:rgba(22,163,74,.10)!important}
.opt-correct .opt-marker{border-color:var(--success)!important;background:var(--success)!important;
  box-shadow:inset 0 0 0 3px var(--surface)}
.opt-wrong{border-color:var(--danger)!important;background:rgba(220,38,38,.08)!important}
.opt-wrong .opt-marker{border-color:var(--danger)!important;background:var(--danger)!important;
  box-shadow:inset 0 0 0 3px var(--surface)}

/* ── Сопоставление (matching) ────────────────────────────────────────────── */
.matching{padding:8px 16px 4px}
.prompts{display:flex;flex-direction:column;gap:10px;margin-bottom:14px}
.prompt{display:flex;align-items:center;gap:10px;background:var(--bg);
  border:1px solid var(--border);border-radius:var(--r-sm);padding:10px}
.prompt-num{flex-shrink:0;width:26px;height:26px;border-radius:50%;
  background:var(--primary);color:#fff;font-weight:700;font-size:.85rem;
  display:flex;align-items:center;justify-content:center}
.prompt-body{flex:1;min-width:0;font-size:.95rem}
.prompt-img{max-width:100%;height:auto;background:#fff;border-radius:4px;
  border:1px solid var(--border)}
.drop-zone{flex-shrink:0;min-width:120px;max-width:46%;min-height:42px;
  border:2px dashed var(--text-3);border-radius:var(--r-sm);
  display:flex;align-items:center;justify-content:center;padding:6px 8px;
  font-size:.85rem;cursor:pointer;transition:all var(--t);background:var(--surface)}
.drop-zone.dz-over{border-color:var(--primary);background:rgba(37,99,235,.06)}
.drop-zone.filled{border-style:solid;border-color:var(--primary)}
.dz-empty{color:var(--text-3)}
.dz-chip{font-size:.85rem;line-height:1.3}
.drop-zone.dz-correct{border-color:var(--success)!important;background:rgba(22,163,74,.10)}
.drop-zone.dz-wrong{border-color:var(--danger)!important;background:rgba(220,38,38,.08);
  flex-direction:column;align-items:flex-start;gap:4px}
.dz-right{font-size:.75rem;color:var(--success);font-weight:600}
.pool-label{font-size:.8rem;color:var(--text-2);margin-bottom:8px}
.match-pool{display:flex;flex-wrap:wrap;gap:8px}
.chip{background:var(--surface);border:2px solid var(--primary);color:var(--primary);
  border-radius:20px;padding:8px 14px;font-size:.88rem;font-weight:600;cursor:grab;
  transition:all var(--t);user-select:none}
.chip:active{cursor:grabbing}
.chip.held{background:var(--primary);color:#fff;box-shadow:0 2px 8px rgba(37,99,235,.35)}
.chip-img{max-width:90px;height:auto;vertical-align:middle}

.answer-actions{padding:14px 16px 16px}
.answer-actions .btn{margin-top:0}
#btn-next{color:#fff}
.mini-tag{display:inline-block;font-size:.7rem;font-weight:700;color:var(--warn);
  background:#fffbeb;border:1px solid #fde68a;border-radius:10px;padding:1px 6px;
  vertical-align:middle}

/* ── Setup ───────────────────────────────────────────────────────────────── */
.setup-card{background:var(--surface);border-radius:var(--r);padding:28px 24px;
  box-shadow:var(--sh);display:flex;flex-direction:column;gap:20px;
  max-width:480px;margin:20px auto}
.setup-title{font-size:1.4rem;font-weight:700}
.setup-sub{color:var(--text-2);font-size:.93rem;margin-top:-12px}
.setup-count label{font-size:.9rem;font-weight:600;color:var(--text-2);
  display:block;margin-bottom:8px}
.count-btns{display:flex;gap:8px;flex-wrap:wrap}
.count-btn{padding:8px 18px;border-radius:var(--r-sm);border:2px solid var(--border);
  font-weight:600;font-size:.9rem;color:var(--text-2);transition:all var(--t)}
.count-btn.active{border-color:var(--primary);color:var(--primary);
  background:rgba(37,99,235,.06)}

/* ── Exit overlay ────────────────────────────────────────────────────────── */
.exit-overlay{position:fixed;inset:0;background:rgba(0,0,0,.45);
  z-index:200;display:flex;align-items:center;justify-content:center;padding:20px}
.exit-dialog{background:var(--surface);border-radius:var(--r);padding:28px 24px;
  max-width:360px;width:100%;box-shadow:var(--sh-lg);text-align:center}
.exit-dialog p{font-size:1rem;line-height:1.5;margin-bottom:20px;color:var(--text)}
.exit-actions{display:flex;gap:10px;justify-content:center}

/* ── Result ──────────────────────────────────────────────────────────────── */
.result-card{background:var(--surface);border-radius:var(--r);
  box-shadow:var(--sh-lg);padding:36px 28px;display:flex;flex-direction:column;
  gap:12px;align-items:center;max-width:480px;margin:20px auto}
.result-icon{font-size:3rem;line-height:1;margin-bottom:4px}
.result-score{font-size:3.5rem;font-weight:800;line-height:1}
.result-detail{color:var(--text-2);font-size:1.05rem}
.result-subject{font-size:.9rem;color:var(--text-3);background:var(--bg);
  padding:4px 14px;border-radius:20px}
.result-actions{width:100%;display:flex;flex-direction:column;gap:10px;margin-top:12px}

/* ── History ─────────────────────────────────────────────────────────────── */
.history-list{display:flex;flex-direction:column;gap:8px}
.history-item{background:var(--surface);border-radius:var(--r-sm);
  padding:14px 16px;display:flex;align-items:center;gap:12px;
  box-shadow:var(--sh-sm);border:1px solid var(--border)}
.history-left{flex:1;min-width:0}
.history-subject{font-weight:600;font-size:.95rem}
.history-date{font-size:.8rem;color:var(--text-3);margin-top:2px}
.history-right{text-align:right;flex-shrink:0}
.history-score{font-size:1.3rem;font-weight:800}
.history-detail{font-size:.8rem;color:var(--text-3)}

/* ── Errors page ─────────────────────────────────────────────────────────── */
.errors-top-actions{display:flex;align-items:center;gap:10px;
  flex-wrap:wrap;margin-bottom:20px}
.errors-subject-block{background:var(--surface);border-radius:var(--r);
  overflow:hidden;box-shadow:var(--sh-sm);border:1px solid var(--border);
  margin-bottom:16px}
.errors-subject-header{padding:14px 16px;display:flex;align-items:center;
  gap:10px;background:var(--bg);border-bottom:1px solid var(--border)}
.errors-subject-name{font-weight:700;font-size:1rem}
.errors-subject-actions{display:flex;gap:8px;margin-left:auto;flex-shrink:0}
.error-item{border-bottom:1px solid var(--border)}
.error-item:last-child{border-bottom:none}
.error-summary{display:flex;align-items:baseline;gap:10px;
  padding:12px 16px;cursor:pointer;font-size:.9rem;list-style:none;
  transition:background var(--t)}
.error-summary:hover{background:var(--bg)}
.error-summary::-webkit-details-marker{display:none}
.error-num{font-weight:700;color:var(--text-3);font-size:.8rem;flex-shrink:0}
.error-text{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.error-count{font-size:.78rem;font-weight:700;color:var(--danger);flex-shrink:0;
  background:#fef2f2;padding:2px 7px;border-radius:10px}
.error-answer{padding:4px 16px 16px 44px;font-size:.9rem;color:var(--text-2);
  background:#f8fafc}
.empty-state{text-align:center;padding:60px 20px;color:var(--text-2);
  display:flex;flex-direction:column;align-items:center;gap:16px}
.empty-icon{font-size:3rem}

/* ── Desktop ──────────────────────────────────────────────────────────────── */
@media(min-width:640px){
  .subject-card{padding:20px}
  .question-text{font-size:1.18rem}
  .topbar{padding:0 24px}
  .setup-card{padding:36px 32px}
  .result-card{padding:48px 40px}
  .errors-actions{flex-direction:row}
  .mc-option{padding:16px 18px;font-size:1rem}
  .exit-actions{flex-direction:row}
}
@media(min-width:1024px){
  .topbar{height:60px}
  .page-wrap{padding:28px 24px}
}