:root{--bg:#f3f6f9;--ink:#1a2940;--muted:#5b6b7d;--line:#cfdbe6;--blue:#1768af;--navy:#132a42;--teal:#15a5b5;--panel:#fff;--warn:#fff6df;--warnline:#f0c873;--good:#e7f8f0;--bad:#fff0f0;--green:#10b981;--red:#e05252;--selected:#eaf5ff;--soft:#f4f8fb;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink)}
*{box-sizing:border-box}[hidden]{display:none!important}body{margin:0;background:var(--bg);font-size:15px;line-height:1.5}button,input,select{font:inherit}button{cursor:pointer;min-height:40px;border:0;border-radius:8px;font-weight:650}button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid var(--teal);outline-offset:2px}button:disabled{opacity:.5;cursor:not-allowed}
.header{background:var(--navy);color:#f7fcff;padding:10px 18px;border-bottom:1px solid rgba(255,255,255,0.08)}.head-inner{max-width:900px;margin:auto;display:flex;align-items:center;gap:16px;min-height:42px}.brand-title{display:flex;align-items:baseline;gap:10px;flex-wrap:wrap}.brand-title strong{font-size:18px;font-weight:800;color:#fff;letter-spacing:-0.2px}.brand-title span{font-size:12.5px;color:#9ed8e8;font-weight:500}main{max-width:900px;margin:0 auto;padding:20px 16px 45px}.panel{padding:clamp(16px,3.5vw,24px);background:var(--panel);border:1px solid var(--line);border-radius:14px;margin:0 0 16px;box-shadow:0 3px 15px #142e4b0b}.panel h2{margin:0 0 12px;font-size:21px}.intro p,.footnote{color:var(--muted)}.stats{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:9px;margin-top:18px}.stats>div{border:1px solid var(--line);border-radius:10px;padding:12px 10px;background:#f7fafc}.stats strong{display:block;font-size:25px;line-height:1.25}.stats span{font-size:12px;color:var(--muted)}.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}label{display:block;color:var(--muted);font-size:13px;margin:10px 0}input,select{display:block;margin-top:5px;width:100%;min-width:0;background:#fff;border:1px solid #9db0c4;border-radius:8px;padding:10px 12px;color:var(--ink)}.presets{display:flex;flex-wrap:wrap;gap:8px;margin:2px 0 10px}.presets button,.secondary{background:#e8eef5;color:#234365;padding:9px 13px}.primary{background:var(--blue);color:#fff;padding:10px 16px}.panel>.primary,.result>.primary{display:block;width:100%;margin-top:14px}.note{font-size:13px;color:var(--blue);font-weight:700}.footnote{font-size:12px}.navigation,.question-header,.quiz-actions{display:flex;gap:10px;align-items:center;justify-content:space-between}.navigation{margin:6px 0 12px}.quiet{background:transparent;color:var(--blue);padding:8px}.progress{background:#dce7ef;border-radius:50px;overflow:hidden;height:6px;margin-bottom:16px}.progress div{height:100%;background:var(--teal);transition:width .15s}.question-header{border-bottom:1px solid var(--line);padding-bottom:12px;margin-bottom:16px;font-size:13.5px;color:var(--muted)}#number{font-weight:800;color:var(--blue);letter-spacing:.4px}.warning{background:var(--warn);border-left:4px solid var(--warnline);color:#684e18;padding:10px 12px;border-radius:8px;margin-bottom:16px;font-size:13px;white-space:pre-line}.stem{white-space:pre-line;font-size:clamp(14.5px,2vw,16.5px);font-weight:600;line-height:1.5;margin:8px 0 14px;overflow-wrap:anywhere}#exhibitWrap{background:#fafcfd;border:1px solid var(--line);border-radius:10px;padding:12px;margin:12px 0 18px}.exhibit-title{color:var(--blue);font-weight:700;font-size:13px;margin-bottom:7px}#exhibit{display:block;max-width:100%;height:auto;margin:auto;border:1px solid #dce2e5;background:white;border-radius:5px}fieldset{border:0;padding:0;margin:0}legend{font-weight:700;font-size:13.5px;margin-bottom:10px;color:#243b54}#choices{display:grid;gap:8px}.choice{margin:0;display:flex;gap:10px;align-items:center;padding:8px 12px;border:1px solid var(--line);border-radius:8px;cursor:pointer;background:#fcfdfe;color:var(--ink);font-size:14.5px;line-height:1.4;min-height:38px;transition:all .12s ease}.choice:hover{border-color:var(--blue);background:#f2f8fd}.choice:has(input:checked){border-color:var(--blue);background:#eaf5ff}.choice.correct-opt{border-color:#10b981;background:#e7f8f0;font-weight:600}.choice input{margin:0;width:18px;height:18px;flex:0 0 18px;accent-color:var(--blue);cursor:pointer}.choice .choice-text{white-space:pre-wrap;overflow-wrap:anywhere;flex:1}.feedback{margin-top:14px;padding:11px 13px;border-radius:8px;background:var(--good);white-space:pre-line;font-weight:600;font-size:13.5px}.feedback.incorrect{background:var(--bad)}.quiz-actions{display:flex;gap:8px;flex-wrap:wrap;margin:18px 0}.quiz-actions button{flex:1 1 calc(25% - 8px);min-width:110px}.quiz-actions button#next{margin-left:auto;max-width:240px}.result{text-align:center}.result h2{font-size:clamp(40px,7vw,60px);color:var(--blue);margin:10px 0}.eyebrow{color:var(--blue);font-size:12px;font-weight:800;letter-spacing:1.3px}footer{text-align:center;border-top:1px solid var(--line);padding:20px 12px;color:var(--muted);font-size:12px}
.mode-select{display:flex;gap:12px;margin:8px 0 16px}.mode-toggle{flex:1;background:#e8eef5;color:#234365;border:2px solid transparent;border-radius:8px;padding:12px 18px;font-size:15px;font-weight:700;transition:all .15s ease;cursor:pointer;text-align:center}.mode-toggle:hover{background:#d8e4f1}.mode-toggle.active{background:var(--blue);color:#fff;border-color:var(--blue);box-shadow:0 3px 12px rgba(23,104,175,0.3)}
.back-btn-header{display:inline-flex;align-items:center;gap:6px;background:rgba(255,255,255,0.12);color:#ffffff;text-decoration:none;font-weight:700;font-size:12.5px;padding:6px 12px;border-radius:6px;border:1px solid rgba(255,255,255,0.22);transition:all .15s;white-space:nowrap}
.back-btn-header:hover{background:rgba(255,255,255,0.24);color:#fff}
.nav-portal-bar{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:18px}
@media(max-width:600px){.nav-portal-bar{grid-template-columns:1fr}}
.portal-nav-link{display:flex;flex-direction:column;gap:3px;background:#ffffff;border:1px solid var(--line);border-radius:10px;padding:12px 16px;text-decoration:none;color:var(--ink);box-shadow:0 2px 8px rgba(0,0,0,0.04);transition:all .15s}
.portal-nav-link:hover{border-color:var(--blue);background:#f4f9fd;transform:translateY(-1px)}
.portal-nav-link strong{color:var(--blue);font-size:14.5px;display:flex;align-items:center;gap:6px}
.portal-nav-link span{font-size:12px;color:var(--muted)}
.nav-link-subtle{display:inline-flex;align-items:center;gap:6px;background:#e8eef5;color:#234365;text-decoration:none;font-size:13px;font-weight:700;padding:6px 12px;border-radius:6px;border:1px solid #cfdbe6}
.nav-link-subtle:hover{background:#dbe6f2;color:var(--blue)}
.results-grid-section{margin:24px 0 18px;text-align:left;border-top:1px solid var(--line);padding-top:20px}
.results-grid-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px;flex-wrap:wrap;gap:10px}
.results-grid-title{font-size:15px;font-weight:700;color:var(--ink)}
.results-legend{display:flex;gap:12px;font-size:13px;color:var(--muted);font-weight:600}
.legend-pill{display:inline-flex;align-items:center;gap:6px}
.legend-dot{width:12px;height:12px;border-radius:3px}
.dot-correct{background:#5ea871}
.dot-wrong{background:#e05252}
.dot-skipped{background:#e2e8f0;border:1px solid #cbd5e1}
.results-question-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(48px,1fr));gap:8px;max-height:380px;overflow-y:auto;padding:2px}
.q-grid-item{display:flex;align-items:center;justify-content:center;height:44px;border-radius:6px;font-size:15px;font-weight:700;border:0;cursor:pointer;transition:transform .12s,box-shadow .12s;text-decoration:none}
.q-grid-item:hover{transform:scale(1.08);box-shadow:0 3px 8px rgba(0,0,0,0.15)}
.q-grid-item.correct{background:#5ea871;color:#ffffff}
.q-grid-item.wrong{background:#e05252;color:#ffffff}
.q-grid-item.skipped{background:#f1f5f9;color:#475569;border:1px solid #cbd5e1}
.q-grid-item.current{outline:2.5px solid var(--blue);outline-offset:2px;font-weight:800;z-index:1;box-shadow:0 0 0 1px #fff,0 3px 8px rgba(23,104,175,0.25)}
.quiz-breakdown-wrap{margin-bottom:16px;background:#ffffff;border:1px solid var(--line);border-radius:10px;padding:5px 8px;box-shadow:0 2px 6px rgba(0,0,0,0.03);box-sizing:border-box}
.quiz-breakdown-grid{display:flex;flex-wrap:nowrap;gap:5px;overflow-x:auto;overflow-y:hidden;padding:5px 2px 6px 2px;scroll-behavior:smooth;-webkit-overflow-scrolling:touch;scrollbar-width:thin;scrollbar-color:#cbd5e1 #f1f5f9}
.quiz-breakdown-grid::-webkit-scrollbar{height:5px}
.quiz-breakdown-grid::-webkit-scrollbar-track{background:#f1f5f9;border-radius:3px}
.quiz-breakdown-grid::-webkit-scrollbar-thumb{background:#cbd5e1;border-radius:3px}
.quiz-breakdown-grid::-webkit-scrollbar-thumb:hover{background:#94a3b8}
.quiz-breakdown-grid .q-grid-item{flex:0 0 auto;min-width:26px;height:26px;border-radius:4px;font-size:11.5px;padding:0 4px}
.quiz-breakdown-grid .q-grid-item.current{outline:2px solid var(--blue);outline-offset:1.5px;font-weight:800;z-index:1;box-shadow:0 0 0 1px #fff,0 2px 5px rgba(23,104,175,0.3)}

/* Drag and Drop Interactive Matching */
.dd-board{min-width:0;margin-top:4px}
.dd-guide{font-size:13px;color:var(--muted);margin:0 0 10px;line-height:1.45}
.dd-live{font-size:12.5px;color:var(--blue);padding:8px 12px;border:1px solid var(--line);border-radius:8px;min-height:38px;background:#f8fafc;margin:0 0 14px;font-weight:600;display:flex;align-items:center}
.dd-layout{display:grid;grid-template-columns:minmax(0,0.95fr) minmax(0,1.25fr);gap:16px;align-items:start}
.dd-pool-panel{position:sticky;top:10px;background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:12px;z-index:2;min-width:0;box-shadow:0 2px 8px rgba(0,0,0,0.03)}
.dd-heading{font-size:13.5px;line-height:1.4;font-weight:700;letter-spacing:0;margin:0;color:var(--navy)}
.dd-pool{display:grid;gap:8px;max-height:60vh;overflow:auto;padding:2px;margin-top:8px;overscroll-behavior:contain}
.dd-card-wrap{display:flex;align-items:stretch;gap:4px;min-width:0}
.dd-item{display:flex;align-items:flex-start;gap:8px;background:#fff;border:1px solid var(--line);color:var(--ink);padding:10px 11px;border-radius:7px;font-size:13px;line-height:1.45;text-align:left;font-weight:500;width:100%;min-width:0;touch-action:none;user-select:none;-webkit-user-select:none;-webkit-touch-callout:none;cursor:grab;overflow-wrap:anywhere;transition:border-color .15s,background .15s}
.dd-item:disabled{opacity:1;cursor:default}
.dd-handle{color:var(--teal);flex-shrink:0;font-size:16px;line-height:1.2}
.dd-item-text{flex:1;white-space:pre-wrap}
.dd-item.picked{border:2px solid var(--blue);background:var(--selected);padding:9px 10px}
.dd-item.dragging{opacity:.35}
.dd-remove{padding:4px 10px;background:#e8eef5;border:1px solid var(--line);color:var(--muted);font-size:16px;font-weight:700;border-radius:6px;cursor:pointer;flex-shrink:0}
.dd-remove:hover{background:#ffdada;color:#c00}
.dd-zones{display:grid;gap:12px;min-width:0}
.dd-target{padding:12px;border:1px solid var(--line);border-radius:10px;background:#f8fafc;min-width:0}
.dd-zone-heading{display:flex;align-items:flex-start;gap:8px;justify-content:space-between;margin:0 0 10px}
.dd-capacity{font-size:11px;font-weight:700;color:var(--muted);white-space:nowrap;background:#eef3f7;padding:2px 7px;border-radius:12px}
.dd-target .dd-card-wrap{margin:6px 0}
.dd-target .dd-item{background:#fff}
.dd-slot{border:1px dashed #b5c7d8;padding:14px 10px;border-radius:7px;color:var(--muted);font-size:12px;text-align:center;margin:6px 0;min-height:48px;background:rgba(255,255,255,0.6);display:flex;align-items:center;justify-content:center}
.dd-place,.dd-return{display:block;width:100%;padding:7px 10px;border:1px solid #bfd3e6;border-radius:6px;background:#e8f2fc;color:var(--blue);font-size:12px;font-weight:700;margin-top:8px;cursor:pointer}
.dd-place:hover,.dd-return:hover{background:#d7e8f9}
.dd-place:disabled,.dd-return:disabled{display:none}
.dd-target.drag-over{border:2px solid var(--blue);padding:11px;background:var(--selected);box-shadow:0 0 0 3px rgba(23,104,175,0.15)}
.dd-clear{font-size:12.5px;margin-top:14px;background:#e8eef5;color:var(--navy);border:1px solid var(--line);padding:7px 14px;border-radius:6px;cursor:pointer}
.dd-clear:hover{background:#dde6f0}
.dd-empty{font-size:12.5px;color:var(--muted);margin:8px 0}
.dd-ghost{position:fixed;z-index:9999;pointer-events:none;background:#fff;color:var(--ink);border:2px solid var(--blue);border-radius:8px;padding:10px 12px;box-shadow:0 10px 30px rgba(0,0,0,0.2);width:min(310px,80vw);font-size:12.5px;line-height:1.45;opacity:.95;font-weight:500}
.dd-item.dd-correct{border-color:var(--green);background:var(--good)}
.dd-item.dd-incorrect{border-color:var(--red);background:var(--bad)}
.dd-mark{font-size:11px;font-weight:700;white-space:nowrap;margin-left:6px}
.dd-correct .dd-mark{color:var(--green)}
.dd-incorrect .dd-mark{color:var(--red)}
.dd-solution{margin-top:18px;border-top:1px solid var(--line);padding-top:10px}
.dd-solution summary{cursor:pointer;font-weight:700;color:var(--blue);font-size:13px}
.dd-solution dl{font-size:13px;line-height:1.5;margin:10px 0}
.dd-solution dt{font-weight:700;color:var(--navy);margin-top:12px}
.dd-solution dd{margin:4px 0 4px 14px;padding-left:8px;border-left:2px solid var(--blue);color:var(--ink)}

@media(max-width:600px){
  .head-inner{gap:8px;flex-wrap:wrap}.brand-title strong{font-size:16px}.stats strong{font-size:22px}.form-grid{grid-template-columns:1fr;gap:1px}.choice{padding:8px 10px;gap:8px}.quiz-actions{gap:6px}.quiz-actions button{flex:1 1 calc(50% - 6px);min-width:90px;padding:10px 8px;font-size:13px}.quiz-breakdown-grid .q-grid-item{min-width:24px;height:24px;font-size:11px;padding:0 3px}
  .dd-layout{grid-template-columns:1fr;gap:12px}
  .dd-pool-panel{top:0;padding:10px;box-shadow:0 4px 10px rgba(0,0,0,0.06)}
  .dd-pool{grid-template-columns:1fr 1fr;gap:6px;max-height:28vh}
  .dd-item{padding:8px;font-size:11.5px}
  .dd-item.picked{padding:7px}
  .dd-handle{font-size:15px}
  .dd-return{margin-top:6px}
  .dd-target{padding:10px}
  .dd-target.drag-over{padding:9px}
  .dd-mark{white-space:normal}
  .dd-live{font-size:11.5px}
  .dd-solution dd{margin-left:6px}
}