/* Advanced V2 learning and exam UI */
.mode-switch,.difficulty-switch{display:flex;gap:8px;flex-wrap:wrap;margin:10px 0 14px}.mode-switch button,.difficulty-switch button{border:1px solid var(--line);background:#fff;color:var(--ink-2);border-radius:999px;padding:9px 13px;font-weight:800}.mode-switch button.on,.difficulty-switch button.on{background:var(--primary);border-color:var(--primary);color:#fff}.lecture-cover{background:linear-gradient(135deg,#eef6ff,#eaf9f2);border:1px solid var(--line);border-radius:24px;padding:22px;margin-bottom:16px}.lecture-section{background:#fff;border:1px solid var(--line);border-radius:18px;padding:18px;margin-bottom:13px;box-shadow:var(--shadow)}.lecture-section h3{margin:0 0 10px}.lecture-section p,.lecture-section li{line-height:1.85}.lecture-example{background:var(--cream);border:1px solid #f2e2a7;border-radius:15px;padding:14px;margin:10px 0}.command-box{background:#fff;border:1px solid var(--line);border-radius:20px;padding:16px;margin-bottom:14px}.command-row{display:grid;grid-template-columns:1fr auto;gap:8px}.command-row textarea{width:100%;min-width:0;border:1.5px solid var(--line);border-radius:14px;padding:12px;background:#fff;color:var(--ink);resize:vertical}.paper-shell{background:#eef2f7;padding:14px;border-radius:18px}.exam-paper{background:#fff;color:#111;border:1px solid #cfd6df;box-shadow:0 8px 24px rgba(0,0,0,.08);padding:22px 18px;min-height:70vh}.paper-head{text-align:center;border-bottom:2px solid #222;padding-bottom:14px;margin-bottom:20px}.paper-head h2{margin:0 0 6px;font-family:serif}.paper-meta{display:flex;justify-content:space-between;font-size:12px}.paper-question{border-bottom:1px solid #ddd;padding:17px 0}.paper-question .qtitle{font-family:serif;font-size:16px;line-height:1.75;font-weight:700}.paper-choice{display:block;width:100%;border:none;background:#fff;color:#111;text-align:left;padding:8px 4px;font-family:serif;font-size:15px;line-height:1.6}.paper-choice.sel{background:#e9f2ff;border-radius:8px}.paper-actions{position:sticky;bottom:0;background:rgba(255,255,255,.97);padding:10px 0;border-top:1px solid #ddd;margin-top:15px}.answer-analysis{background:#fff;border:1px solid var(--line);border-radius:18px;padding:16px;margin:12px 0}.wrong-note{background:var(--pink);border:1px solid #efc7d3;border-radius:14px;padding:13px;margin-top:10px}.avatar-stage{background:linear-gradient(180deg,#eaf5ff,#f8fbff);border:1px solid var(--line);border-radius:24px;min-height:280px;display:flex;align-items:center;justify-content:center;position:relative;overflow:hidden;margin-bottom:14px}.avatar-person{width:150px;height:210px;position:relative;animation:avatarFloat 2.8s ease-in-out infinite}.avatar-head{width:82px;height:82px;border-radius:50%;background:#f2c8a5;margin:0 auto;position:relative;border:3px solid #fff;box-shadow:0 4px 12px rgba(0,0,0,.12)}.avatar-hair{position:absolute;left:6px;right:6px;top:-4px;height:36px;background:#5b3b28;border-radius:40px 40px 18px 18px}.avatar-eyes{position:absolute;top:39px;left:20px;right:20px;display:flex;justify-content:space-between}.avatar-eyes i{width:7px;height:7px;background:#26364c;border-radius:50%}.avatar-mouth{position:absolute;width:23px;height:10px;border-bottom:3px solid #b45b62;border-radius:0 0 20px 20px;left:28px;top:58px}.avatar-body{width:125px;height:130px;background:var(--primary);border-radius:45px 45px 18px 18px;margin:-4px auto 0;border:4px solid #fff}.avatar-person.talking .avatar-mouth{animation:talkMouth .28s linear infinite alternate}.avatar-label{position:absolute;bottom:12px;background:#fff;border:1px solid var(--line);border-radius:999px;padding:7px 13px;font-size:12px;font-weight:800}.word-preview{font-weight:850;font-size:17px}.word-preview.ko{color:var(--primary)}.example-display{margin-top:9px;background:var(--cream);border:1px solid #f2e2a7;border-radius:13px;padding:12px;line-height:1.65}.level-badge{display:inline-block;border-radius:999px;padding:4px 9px;font-size:11px;font-weight:850;background:var(--primary-soft);color:var(--primary)}@keyframes avatarFloat{0%,100%{transform:translateY(0)}50%{transform:translateY(-7px)}}@keyframes talkMouth{from{height:5px}to{height:15px}}@media(max-width:480px){.command-row{grid-template-columns:1fr}.exam-paper{padding:18px 13px}.paper-meta{gap:8px;flex-wrap:wrap}.avatar-stage{min-height:245px}.lecture-section{padding:15px}}