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.75rem;border-bottom:1px solid var(--border);border-left:3px solid var(--border)}.dragdrop-list{display:flex;flex-direction:column;gap:.5rem;margin-bottom:.75rem}.dragdrop-item{padding:.7rem .9rem;border-radius:8px;border:1px solid var(--border);background:var(--surface);color:var(--text);cursor:grab;font-size:.9rem;-webkit-user-select:none;user-select:none;transition:border-color .15s ease,background .15s 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var(--accent);background:var(--surface);color:var(--text);font-size:.85rem;cursor:grab;-webkit-user-select:none;user-select:none}.matching-chip:active{cursor:grabbing}.matching-chip.dragging{opacity:.4}.matching-row{display:grid;grid-template-columns:1fr 1fr;gap:.75rem;align-items:center;margin-bottom:.6rem}.matching-row-label{padding:.6rem .8rem;border-radius:8px;background:var(--surface);border:1px solid var(--border);font-size:.9rem}.matching-slot{min-height:2.6rem;border-radius:8px;border:1px dashed var(--border);background:var(--surface-alt);display:flex;align-items:center;padding:.4rem .6rem;transition:border-color .15s ease}.matching-slot.drag-over{border-color:var(--accent)}.matching-slot.filled{border-style:solid}.matching-slot.static.correct{border-color:var(--success);background:var(--success-bg);color:var(--success-text);border-style:solid}.matching-slot.static.incorrect{border-color:var(--danger);background:var(--danger-bg);color:var(--danger-text);border-style:solid}@media(max-width:720px){.matching-row{grid-template-columns:1fr}}.case-study-scenario{background:var(--surface-alt);border:1px solid var(--border);border-left:3px solid var(--accent);border-radius:8px;padding:.9rem 1.1rem;margin-bottom:1rem}.timer-value{transition:color .3s ease}button:focus-visible,input:focus-visible,a:focus-visible,textarea:focus-visible{outline:2px solid var(--accent);outline-offset:2px}@keyframes skeleton-shimmer{0%{background-position:200% 0}to{background-position:-200% 0}}.skeleton{background:linear-gradient(90deg,var(--surface-alt) 25%,var(--border) 50%,var(--surface-alt) 75%);background-size:200% 100%;animation:skeleton-shimmer 1.6s ease-in-out infinite;border-radius:6px}.skeleton-text{display:block}@keyframes spin{to{transform:rotate(360deg)}}.spinner{display:inline-block;width:16px;height:16px;vertical-align:-3px;border:2px solid var(--border);border-top-color:var(--accent);border-radius:50%;animation:spin .7s linear infinite}.spinner.spinner-light{border-color:#ffffff59;border-top-color:#fff}.loading-line{display:flex;align-items:center;gap:.5rem;color:var(--text-muted)}@media(max-width:480px){.app-nav{flex-wrap:wrap;padding:.6rem 1rem;gap:.5rem}.app-nav h1{font-size:1rem;margin:0 .5rem 0 0}.nav-tabs{gap:.2rem}.app-nav button{padding:.35rem .4rem;font-size:.78rem}.app-main{padding:1rem}}