:root{
    --sn-dark:#0f2942;
    --sn-green:#2e7d32;
    --sn-red:#c62828;
    --sn-blue:#1565c0;
    --bg:#f4f6f8;
    --card:#ffffff;
    --border:#e0e4e8;
    --text:#1b2733;
    --muted:#5b6b79;
    --option-hover:#9fb4c7;
    --option-selected-bg:#eaf2fb;
    --option-correct-bg:#e9f6ea;
    --option-incorrect-bg:#fdecea;
    --match-item-bg:#f0f3f6;
    --match-select-bg:#fff;
    --feedback-right-bg:#e9f6ea;
    --feedback-right-border:#bfe3c2;
    --feedback-wrong-bg:#fdecea;
    --feedback-wrong-border:#f1c2bd;
    --analogy-bg:#fff9e8;
    --analogy-border:#e0b93c;
    --analogy-accent:#8a6d1a;
    --table-head-bg:#f0f3f6;
    --jump-bg:#eef1f4;
    --jump-correct-bg:#dcefe0;
    --jump-wrong-bg:#fdecea;
    --btn-secondary-bg:#fff;
    --btn-secondary-hover:#f0f3f6;
  }
  [data-theme="dark"]{
    --sn-dark:#1e3a5f;
    --sn-green:#4caf50;
    --sn-red:#ef5350;
    --sn-blue:#64b5f6;
    --bg:#0f172a;
    --card:#1e293b;
    --border:#334155;
    --text:#e2e8f0;
    --muted:#94a3b8;
    --option-hover:#475569;
    --option-selected-bg:#1e3a5f;
    --option-correct-bg:#1b3d24;
    --option-incorrect-bg:#3d1f1f;
    --match-item-bg:#334155;
    --match-select-bg:#0f172a;
    --feedback-right-bg:#1b3d24;
    --feedback-right-border:#2e7d32;
    --feedback-wrong-bg:#3d1f1f;
    --feedback-wrong-border:#c62828;
    --analogy-bg:#3d3520;
    --analogy-border:#b8860b;
    --analogy-accent:#d4b84a;
    --table-head-bg:#334155;
    --jump-bg:#334155;
    --jump-correct-bg:#1b3d24;
    --jump-wrong-bg:#3d1f1f;
    --btn-secondary-bg:#334155;
    --btn-secondary-hover:#475569;
  }
  *{box-sizing:border-box;}
  body{
    margin:0;
    font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
    background:var(--bg);
    color:var(--text);
  }
  .app{max-width:760px;margin:0 auto;padding:20px 16px 60px;}
  header{
    background:var(--sn-dark);
    color:#fff;
    padding:14px 16px 12px;
    border-radius:12px;
    margin-bottom:18px;
  }
  .header-top{
    display:flex;
    justify-content:space-between;
    align-items:flex-start;
    gap:12px;
    margin-bottom:12px;
  }
  header h1{font-size:16px;margin:0;font-weight:600;letter-spacing:.2px;}
  header .sub{font-size:12px;opacity:.8;margin-top:2px;}
  .header-actions{
    display:flex;
    flex-wrap:wrap;
    gap:6px;
    justify-content:flex-end;
    flex:0 0 auto;
    max-width:100%;
  }
  .header-bar{
    display:grid;
    grid-template-columns:1fr auto;
    align-items:center;
    gap:12px;
    margin-bottom:10px;
  }
  .timer-wrap{display:flex;justify-content:center;min-width:0;}
  .timer-display{
    font-size:clamp(22px,6vw,32px);
    font-weight:700;
    font-variant-numeric:tabular-nums;
    letter-spacing:.08em;
    line-height:1;
    opacity:.95;
  }
  .header-stats{
    font-size:13px;
    text-align:right;
    white-space:nowrap;
  }
  .header-stats b{font-size:15px;}
  .progress-wrap{background:rgba(255,255,255,.15);border-radius:8px;height:8px;width:100%;overflow:hidden;}
  .progress-bar{background:#4caf50;height:100%;width:0%;transition:width .25s;}
  .hdr-btn{
    background:rgba(255,255,255,.12);
    color:#fff;
    border:1px solid rgba(255,255,255,.25);
    border-radius:8px;
    padding:6px 11px;
    font-size:12px;
    cursor:pointer;
    font-weight:600;
    white-space:nowrap;
  }
  .hdr-btn:hover{background:rgba(255,255,255,.2);}
  .hdr-btn.primary{background:#4caf50;border-color:#4caf50;}
  .hdr-btn.danger{background:rgba(198,40,40,.85);border-color:rgba(255,255,255,.3);}
  .hdr-btn:disabled{opacity:.4;cursor:not-allowed;}
  .hidden{display:none !important;}
  .card{
    background:var(--card);
    border:1px solid var(--border);
    border-radius:14px;
    padding:22px 22px 18px;
    box-shadow:0 1px 3px rgba(15,41,66,.06);
  }
  .start-screen{text-align:center;padding:36px 20px;}
  .start-screen p{color:var(--muted);margin:0 0 18px;line-height:1.5;}
  .start-screen .btn-row{justify-content:center;}
  .mode-picker{padding:20px 18px;}
  .mode-picker h2{margin:0 0 6px;font-size:18px;}
  .mode-picker .intro{color:var(--muted);font-size:14px;margin:0 0 16px;line-height:1.5;}
  .mode-list{display:flex;flex-direction:column;gap:10px;}
  .mode-item{
    display:flex;align-items:center;justify-content:space-between;gap:12px;
    padding:14px 16px;border:1px solid var(--border);border-radius:12px;background:var(--match-item-bg);
  }
  .mode-item.featured{border-color:var(--sn-blue);}
  .mode-info{flex:1;min-width:0;text-align:left;}
  .mode-info strong{display:block;font-size:15px;margin-bottom:2px;}
  .mode-info .count{font-size:12px;color:var(--sn-blue);font-weight:600;}
  .mode-info .desc{font-size:12px;color:var(--muted);margin-top:4px;line-height:1.4;}
  .mode-item .btn-start{
    flex:0 0 auto;background:var(--sn-dark);color:#fff;border:none;border-radius:8px;
    padding:9px 14px;font-size:13px;font-weight:600;cursor:pointer;white-space:nowrap;
  }
  .mode-item .btn-start:hover{opacity:.9;}
  @media (max-width:560px){
    .mode-item{flex-direction:column;align-items:stretch;}
    .mode-item .btn-start{width:100%;}
  }
  .qmeta{font-size:12px;color:var(--muted);text-transform:uppercase;letter-spacing:.5px;margin-bottom:8px;font-weight:600;}
  .qtext{font-size:16px;line-height:1.5;margin-bottom:16px;white-space:pre-wrap;}
  .instruction{font-size:12px;color:var(--sn-blue);font-weight:600;margin-bottom:14px;text-transform:uppercase;letter-spacing:.4px;}
  .option{
    display:flex;align-items:flex-start;gap:10px;padding:12px 14px;
    border:1.5px solid var(--border);border-radius:10px;margin-bottom:9px;
    cursor:pointer;transition:border-color .15s,background .15s;font-size:14.5px;line-height:1.4;
  }
  .option:hover{border-color:var(--option-hover);}
  .option.selected{border-color:var(--sn-blue);background:var(--option-selected-bg);}
  .option .letter{
    flex:0 0 auto;width:22px;height:22px;border-radius:50%;border:1.5px solid #b7c2cc;
    display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:700;color:var(--muted);
  }
  .option.multi .letter{border-radius:6px;}
  .option.correct{border-color:var(--sn-green);background:var(--option-correct-bg);}
  .option.correct .letter{background:var(--sn-green);border-color:var(--sn-green);color:#fff;}
  .option.incorrect{border-color:var(--sn-red);background:var(--option-incorrect-bg);}
  .option.incorrect .letter{background:var(--sn-red);border-color:var(--sn-red);color:#fff;}
  .option.disabled{cursor:default;}
  .match-row{display:flex;align-items:center;gap:10px;margin-bottom:10px;flex-wrap:wrap;}
  .match-row .item{flex:1 1 220px;font-size:14px;font-weight:600;background:var(--match-item-bg);border-radius:8px;padding:9px 12px;}
  .match-row select{
    flex:1 1 260px;padding:9px 10px;border-radius:8px;border:1.5px solid var(--border);
    font-size:13.5px;background:var(--match-select-bg);color:var(--text);
  }
  .match-row.correct select{border-color:var(--sn-green);}
  .match-row.incorrect select{border-color:var(--sn-red);}
  .btn-row{display:flex;gap:10px;margin-top:18px;flex-wrap:wrap;}
  button{
    border:none;border-radius:9px;padding:11px 20px;font-size:14px;font-weight:600;
    cursor:pointer;transition:opacity .15s,transform .05s;
  }
  button:active{transform:scale(.98);}
  button:disabled{opacity:.45;cursor:not-allowed;}
  .btn-primary{background:var(--sn-dark);color:#fff;}
  .btn-primary:hover:not(:disabled){opacity:.9;}
  .btn-secondary{background:var(--btn-secondary-bg);color:var(--text);border:1.5px solid var(--border);}
  .btn-secondary:hover:not(:disabled){background:var(--btn-secondary-hover);}
  .btn-danger{background:var(--sn-red);color:#fff;}
  .feedback{margin-top:16px;padding:14px 16px;border-radius:10px;font-size:14px;line-height:1.55;}
  .feedback.right{background:var(--feedback-right-bg);border:1px solid var(--feedback-right-border);}
  .feedback.wrong{background:var(--feedback-wrong-bg);border:1px solid var(--feedback-wrong-border);}
  .feedback .verdict{font-weight:700;margin-bottom:6px;font-size:14px;}
  .feedback .verdict.right-text{color:var(--sn-green);}
  .feedback .verdict.wrong-text{color:var(--sn-red);}
  .analogy{
    margin-top:10px;padding:10px 12px;background:var(--analogy-bg);
    border-left:3px solid var(--analogy-border);border-radius:6px;font-size:13.5px;font-style:italic;
  }
  .analogy b{font-style:normal;color:var(--analogy-accent);}
  .results{text-align:center;padding:24px 10px;}
  .results h2{margin-top:0;font-size:22px;}
  .score-grid{
    display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:16px 0 20px;
  }
  .score-box{
    border:1px solid var(--border);border-radius:12px;padding:16px 10px;background:var(--match-item-bg);
  }
  .score-box .pct{font-size:28px;font-weight:700;color:var(--sn-dark);}
  [data-theme="dark"] .score-box .pct{color:var(--sn-blue);}
  .score-box .lbl{font-size:12px;color:var(--muted);margin-top:4px;line-height:1.35;}
  .report-meta{font-size:13px;color:var(--muted);margin-bottom:16px;line-height:1.6;}
  .review-item{
    text-align:left;border:1px solid var(--border);border-radius:10px;padding:12px 14px;margin-bottom:8px;font-size:13.5px;
  }
  .review-item.bad{border-left:4px solid var(--sn-red);}
  .review-item .qn{font-weight:700;margin-bottom:4px;}
  .review-item .ans{font-size:12px;color:var(--muted);margin-top:6px;}
  .history-item{
    border-bottom:1px solid var(--border);padding:12px 0;font-size:13px;line-height:1.5;
  }
  .history-item:last-child{border-bottom:none;}
  .history-empty{color:var(--muted);font-style:italic;}
  select:disabled{opacity:.85;}
  .jump{display:flex;flex-wrap:wrap;gap:6px;margin-top:14px;}
  .jump button{padding:6px 9px;font-size:11.5px;border-radius:7px;background:var(--jump-bg);color:var(--text);border:1px solid transparent;font-weight:600;}
  .jump button.correct{background:var(--sn-green);color:#fff;border-color:var(--sn-green);}
  .jump button.wrong{background:var(--sn-red);color:#fff;border-color:var(--sn-red);}
  .jump button.current{background:var(--sn-dark);color:#fff;border-color:var(--sn-dark);box-shadow:0 0 0 2px rgba(255,255,255,.35);}
  .load-error{padding:16px;line-height:1.6;}
  .load-error code{background:var(--match-item-bg);padding:2px 6px;border-radius:4px;font-size:13px;}
  .locked-note{
    margin-top:12px;padding:12px 14px;border-radius:10px;background:var(--match-item-bg);
    font-size:13px;color:var(--muted);text-align:center;
  }
  /* Link estilizado como botão do header (ex.: "Início") */
  a.hdr-btn{text-decoration:none;display:inline-flex;align-items:center;line-height:1.2;}
  /* Relatório por domínio */
  .domain-table{width:100%;border-collapse:collapse;font-size:13px;text-align:left;}
  .domain-table th,.domain-table td{padding:8px 10px;border-bottom:1px solid var(--border);}
  .domain-table th{font-size:11px;text-transform:uppercase;letter-spacing:.4px;color:var(--muted);}
  .domain-table .num{text-align:right;white-space:nowrap;}
  .domain-table .pct{font-weight:700;}
  .domain-table .pct.good{color:var(--sn-green);}
  .domain-table .pct.mid{color:var(--analogy-accent);}
  .domain-table .pct.bad{color:var(--sn-red);}
  /* Landing (index.html) */
  .route-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:14px;}
  .route-card{
    display:flex;flex-direction:column;gap:10px;padding:20px 18px;
    border:1px solid var(--border);border-radius:14px;background:var(--card);
    box-shadow:0 1px 3px rgba(15,41,66,.06);
  }
  .route-card h2{margin:0;font-size:17px;}
  .route-card .kicker{font-size:11px;text-transform:uppercase;letter-spacing:.5px;color:var(--sn-blue);font-weight:700;}
  .route-card p{margin:0;color:var(--muted);font-size:14px;line-height:1.5;flex:1;}
  .route-card ul{margin:0;padding-left:18px;color:var(--muted);font-size:13px;line-height:1.5;}
  .route-card .btn-primary{
    align-self:flex-start;text-decoration:none;display:inline-block;
    border-radius:9px;padding:11px 20px;font-size:14px;font-weight:600;
  }
  .route-card .btn-primary:hover{opacity:.9;}
  /* Página de estudo */
  .study-section{margin-bottom:18px;}
  .study-section h3{font-size:14px;text-transform:uppercase;letter-spacing:.5px;color:var(--muted);margin:0 0 10px;}
  .phase{margin-bottom:12px;}
  .phase-title{font-size:13px;font-weight:700;margin:0 0 8px;color:var(--sn-blue);}
  .mode-info .best{font-size:12px;color:var(--muted);margin-top:4px;}
  .mode-info .best b{color:var(--sn-green);}
  .tag-grid{display:flex;flex-wrap:wrap;gap:8px;}
  .tag-chip{
    border:1px solid var(--border);background:var(--match-item-bg);color:var(--text);
    border-radius:999px;padding:7px 12px;font-size:12.5px;font-weight:600;cursor:pointer;
  }
  .tag-chip:hover{border-color:var(--sn-blue);}
  .tag-chip small{color:var(--muted);font-weight:500;margin-left:4px;}
  .study-tabs{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:16px;}
  .study-tabs button{
    background:var(--match-item-bg);color:var(--text);border:1px solid var(--border);
    border-radius:999px;padding:8px 14px;font-size:13px;
  }
  .study-tabs button.active{background:var(--sn-dark);color:#fff;border-color:var(--sn-dark);}
  .review-note{font-size:12.5px;color:var(--analogy-accent);margin-top:6px;line-height:1.45;}
  .review-item .meta{font-size:11.5px;color:var(--muted);margin-top:4px;}
  @media (max-width:560px){
    .header-top{flex-direction:column;align-items:stretch;}
    .header-actions{justify-content:flex-end;}
    .header-bar{grid-template-columns:1fr;text-align:center;}
    .header-stats{text-align:center;}
    .score-grid{grid-template-columns:1fr;}
    .route-list{grid-template-columns:1fr;}
    .hdr-btn{font-size:11px;padding:6px 9px;}
  }