:root{--bg:#0f172a;--panel:#111827;--card:#1f2937;--text:#e5e7eb;--muted:#9ca3af;--accent:#38bdf8;--ok:#22c55e;--bad:#ef4444;--border:#374151}*{box-sizing:border-box}body{margin:0;font-family:system-ui;background:radial-gradient(circle at top,#1e293b 0,var(--bg) 45%,#020617 100%);color:var(--text);min-height:100vh;display:flex;justify-content:center;padding:18px}.app{width:min(980px,100%);background:rgba(17,24,39,.94);border:1px solid var(--border);border-radius:24px;overflow:hidden}header{padding:20px;border-bottom:1px solid var(--border)}h1{margin:0}.muted{color:var(--muted)}main{padding:20px}.card{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:16px}.quiz-list{display:grid;gap:12px}.quiz-btn,.btn{width:100%;text-align:left;padding:14px;border:1px solid var(--border);background:#111827;color:var(--text);border-radius:12px;cursor:pointer}.btn.primary{background:var(--accent);color:#082f49;border:none;font-weight:700}.btn-row{display:flex;gap:10px;flex-wrap:wrap}.answers{display:grid;gap:10px}.answer.correct{border-color:var(--ok);background:rgba(34,197,94,.16)}.answer.wrong{border-color:var(--bad);background:rgba(239,68,68,.16)}.topbar{display:flex;justify-content:space-between;gap:10px;align-items:center;margin-bottom:14px;flex-wrap:wrap}.progress-wrap{height:12px;flex:1;background:#020617;border:1px solid var(--border);border-radius:999px;overflow:hidden}.progress{height:100%;background:linear-gradient(90deg,var(--accent),var(--ok))}.table{width:100%;border-collapse:collapse}.table th,.table td{padding:8px;border-bottom:1px solid #2a3448;text-align:left}input{width:100%;padding:10px;border-radius:10px;border:1px solid #374151;background:#0b1327;color:#e5e7eb;margin:8px 0 14px}.edu-link{display:block;text-decoration:none;color:var(--text)}.edu-link .muted{text-decoration:none}
.match-wrap{display:grid;grid-template-columns:1.5fr 1fr;gap:14px}
.match-grid{display:grid;gap:10px}
.match-row{display:grid;grid-template-columns:1fr 180px;gap:10px;align-items:center}
.match-left{font-weight:600}
.match-drop{min-height:42px;display:flex;align-items:center;justify-content:center;padding:8px;border:2px dashed #4b5563;border-radius:10px;background:#0b1327;color:#cbd5e1}
.match-drop.filled{border-style:solid}
.match-pool{display:flex;flex-wrap:wrap;gap:8px;align-content:flex-start}
.match-pool .match-chip{width:auto;display:inline-flex;align-items:center;justify-content:center;cursor:grab;text-align:center;min-height:44px;padding:10px 14px;line-height:1.2;flex:0 0 auto}
.sentence-layout{display:grid;grid-template-columns:1.4fr 1fr;gap:12px;align-items:start}
.match-chip.dragging{opacity:.5}
.match-chip.selected{outline:2px solid #38bdf8;background:#0b2545}
.info-box{border-left:4px solid #38bdf8}
.qimg-wrap{margin:6px 0 12px}
.qimg{width:100%;max-width:820px;border-radius:10px;border:1px solid #374151;display:block}
.sent-line{line-height:2.1}
.sent-blank{display:inline-flex;align-items:center;justify-content:center;min-width:120px;min-height:40px;margin:0 4px;padding:6px 10px;border:2px dashed #4b5563;border-radius:10px;background:#0b1327;color:#cbd5e1;vertical-align:middle}
.sent-blank.over{border-color:#38bdf8;background:#13223d}
.sent-blank.filled{border-style:solid}
.sticky-next{position:sticky;bottom:8px;background:linear-gradient(180deg,rgba(15,23,42,0),rgba(15,23,42,.92) 28%,rgba(15,23,42,.98));padding-top:10px;z-index:5}
@media (max-width: 760px){.match-wrap{grid-template-columns:1fr}.sentence-layout{grid-template-columns:1fr}.match-row{grid-template-columns:1fr}.match-drop{justify-content:flex-start}.card{min-height:calc(100dvh - 130px)}.sent-blank{min-width:92px;padding:6px 8px}}
.edu-card{margin-top:14px}
.edu-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:10px}
.edu-item{border:1px solid var(--border);background:#0b1327;border-radius:12px;padding:8px;cursor:pointer;color:var(--text);text-align:left}
.edu-item img{width:100%;height:120px;object-fit:cover;border-radius:8px;border:1px solid #334155;display:block}
.edu-item span{display:block;margin-top:8px;font-size:13px;line-height:1.3}
.edu-lightbox{border:none;padding:12px;width:100vw;max-width:100vw;height:100vh;max-height:100vh;background:#020617;color:var(--text);border-radius:0;margin:0}
.edu-lightbox::backdrop{background:rgba(2,6,23,.78)}
.edu-lightbox img{width:100%;height:calc(100vh - 120px);object-fit:contain;border-radius:10px;border:1px solid #334155;background:#020617;user-select:none}
.edu-close{position:sticky;top:0;margin-left:auto;border:1px solid #475569;background:#0f172a;color:#e5e7eb;border-radius:10px;padding:4px 10px;font-size:24px;line-height:1;cursor:pointer;display:block}
.media-status{display:none;margin-top:8px;font-size:13px;color:var(--muted)}
.media-status.is-visible{display:block}
.media-status.is-busy::before{content:'⏳ ';}
@media (max-width:760px){.edu-item img{height:96px}.edu-lightbox{padding:8px;width:100vw;height:100vh}.edu-lightbox img{height:calc(100vh - 130px)}}

.tabs{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:14px}
.tab-btn{padding:10px 14px;border:1px solid var(--border);background:#0b1327;color:var(--text);border-radius:10px;cursor:pointer}
.tab-btn.active{background:var(--accent);color:#082f49;border-color:transparent;font-weight:700}
.tab-panel{display:none}
.tab-panel.active{display:block}
.pod-card{border:1px solid var(--border);background:#0b1327;border-radius:12px;padding:12px}