@font-face{font-family:Ko Sans;src:url(/fonts/ko-sans/ko-sans-regular.otf) format("opentype");font-weight:400;font-style:normal;font-display:swap}@font-face{font-family:Ko Sans;src:url(/fonts/ko-sans/ko-sans-medium.otf) format("opentype");font-weight:500;font-style:normal;font-display:swap}@font-face{font-family:Ko Sans;src:url(/fonts/ko-sans/ko-sans-semibold.otf) format("opentype");font-weight:600;font-style:normal;font-display:swap}@font-face{font-family:Ko Sans;src:url(/fonts/ko-sans/ko-sans-bold.otf) format("opentype");font-weight:700;font-style:normal;font-display:swap}:root{--bg: #fef7ec;--surface: #ffffff;--surface-2: #f5f1e8;--warm: #f8deb3;--text: #663e17;--muted: #98826a;--muted-2: #b2a283;--border: #ebe4d4;--border-strong: #d9cfb8;--primary: #663e17;--primary-hover: #75522d;--primary-text: #ffffff;--secondary: #f2ae40;--secondary-strong: #c77b12;--success: #1e7e34;--success-bg: rgba(40, 167, 69, .12);--warning: #b06a0c;--warning-bg: rgba(242, 174, 64, .18);--danger: 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strong{color:var(--success);font-size:13px}.course-thumb{width:96px;height:64px;border-radius:12px;object-fit:cover;background:var(--surface-2);flex-shrink:0}.course-thumb-icon{display:grid;place-items:center;color:var(--muted-2)}.icon-text{display:inline-flex;align-items:center;gap:5px}.meta{display:inline-flex;align-items:center;gap:5px;color:var(--muted);font-size:12px}.meta svg{color:var(--muted-2);flex-shrink:0}.viewer-overlay{position:fixed;inset:0;z-index:1000;background:#000000c7;display:flex;align-items:center;justify-content:center;padding:calc(10px + var(--safe-top)) 10px calc(10px + var(--safe-bottom));animation:viewer-fade .15s ease}@keyframes viewer-fade{0%{opacity:0}to{opacity:1}}.viewer-box{width:100%;max-width:760px;height:100%;background:var(--surface);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column;box-shadow:0 18px 50px #00000080}.viewer-box:fullscreen,.viewer-box:-webkit-full-screen{max-width:none;width:100%;height:100%;border-radius:0}.viewer-head{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:12px 14px;border-bottom:1px solid var(--border);font-weight:700;font-size:14px;color:var(--text)}.viewer-tools{display:flex;align-items:center;gap:8px;flex-shrink:0}.viewer-tool{border:none;background:var(--surface-2);color:var(--text);width:32px;height:32px;border-radius:50%;font-size:15px;line-height:1;cursor:pointer;display:grid;place-items:center}.viewer-tool:active{background:var(--border)}.viewer-body{position:relative;flex:1;min-height:0;background:var(--surface-2);display:flex;align-items:center;justify-content:center;overflow:auto}.viewer-loading{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;color:var(--muted);font-size:12px;background:var(--surface-2);z-index:1}.viewer-body img{max-width:100%;max-height:100%;object-fit:contain;display:block}.viewer-body iframe{width:100%;height:100%;border:none}.viewer-foot{display:flex;align-items:center;justify-content:center;gap:6px;width:100%;padding:12px;border:none;border-top:1px solid var(--border);background:var(--surface);color:var(--secondary-strong);font-size:13px;font-weight:700;text-decoration:none;cursor:pointer}.viewer-foot:active{background:var(--surface-2)}.modal-overlay{position:fixed;inset:0;z-index:1000;background:#00000080;display:flex;align-items:flex-end;justify-content:center;padding:0;animation:viewer-fade .15s ease}@media (min-width: 520px){.modal-overlay{align-items:center;padding:16px}}.modal-box{width:100%;max-width:460px;background:var(--surface);border-radius:var(--radius) var(--radius) 0 0;box-shadow:0 -8px 40px #00000040;max-height:86vh;display:flex;flex-direction:column;animation:modal-up .2s ease}@media (min-width: 520px){.modal-box{border-radius:var(--radius);animation:viewer-fade .18s ease}}@keyframes modal-up{0%{transform:translateY(24px);opacity:.6}to{transform:none;opacity:1}}.modal-head{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:16px 18px;border-bottom:1px solid var(--border)}.modal-title{font-weight:700;font-size:14px;color:var(--text)}.modal-close{border:none;background:var(--surface-2);color:var(--text);width:30px;height:30px;border-radius:50%;font-size:15px;line-height:1;cursor:pointer;flex-shrink:0}.modal-body{padding:18px 18px calc(22px + var(--safe-bottom));overflow-y:auto}.welcome-modal>p{margin:0 0 14px;color:var(--text)}.welcome-list{list-style:none;margin:0 0 18px;padding:0;display:flex;flex-direction:column;gap:12px}.welcome-list li{display:flex;align-items:flex-start;gap:12px;line-height:1.55}.welcome-ic{flex-shrink:0;width:38px;height:38px;border-radius:10px;background:var(--surface-2);color:var(--secondary-strong);display:grid;place-items:center}.welcome-list b{color:var(--text);font-size:13px}.cover{width:100%;height:100%;object-fit:cover;display:block}.cover-fallback{display:grid;place-items:center;background:linear-gradient(135deg,var(--warm) 0%,var(--surface-2) 100%)}.cover-fallback svg{opacity:.92}.thumb-cover{position:relative;overflow:hidden;padding:0}.thumb-badge{position:absolute;inset-block-end:3px;inset-inline-start:3px;width:20px;height:20px;border-radius:6px;background:#663e17b8;color:#fff;display:grid;place-items:center}.lecture-title{font-size:15px;font-weight:700;color:var(--text);margin:0;line-height:1.5}.info-row{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:9px 0;border-bottom:1px solid var(--border)}.info-row:last-child{border-bottom:none}.info-row-label{display:inline-flex;align-items:center;gap:6px;color:var(--muted)}.info-row-label svg{color:var(--muted-2)}.info-row-value{font-weight:700;color:var(--text);text-align:left}.note-card{display:flex;align-items:flex-start;gap:8px;color:var(--muted);background:var(--surface-2);border-color:transparent;line-height:1.6}.note-card svg{color:var(--secondary-strong);flex-shrink:0;margin-top:1px}.viewer-screen{position:fixed;inset:0;z-index:60;display:flex;flex-direction:column;background:var(--surface-2)}.viewer-topbar{display:flex;align-items:center;gap:10px;padding:calc(10px + var(--safe-top)) 12px 10px;background:var(--surface);border-bottom:1px solid var(--border);flex-shrink:0}.viewer-topbar h1{flex:1;margin:0;font-size:15px;font-weight:700;color:var(--text)}.viewer-stage{position:relative;flex:1;min-height:0;overflow:hidden;background:var(--surface-2);display:flex;align-items:center;justify-content:center}.zoom-img{max-width:100%;display:block;margin:0 auto}.pdf-pages{display:flex;flex-direction:column;gap:8px;width:100%;padding:8px}.pdf-page{width:100%;height:auto;display:block;background:#fff;border-radius:6px;box-shadow:0 1px 4px #0000001f}.zoom-fab{position:absolute;inset-block-end:14px;inset-inline-start:14px;display:flex;flex-direction:column;gap:8px;z-index:2}.zoom-fab button{width:40px;height:40px;border-radius:50%;border:1px solid var(--border);background:var(--surface);color:var(--text);display:grid;place-items:center;box-shadow:var(--shadow-card)}.zoom-fab button:active{background:var(--surface-2)}.viewer-upload-bar{flex-shrink:0;padding:12px 14px calc(12px + var(--safe-bottom));background:var(--surface);border-top:1px solid var(--border)}.viewer-upload-bar .btn{margin:0}.upload-done{display:flex;align-items:center;justify-content:center;gap:6px;color:var(--success);font-weight:700;padding:6px}.open-exam-card{background:var(--success-bg);border:1px solid rgba(40,167,69,.35)}.open-exam-card.clickable:active{background:#28a7452e}.open-exam-title{margin:0;font-size:14px;font-weight:700;color:var(--text);line-height:1.6}.open-exam-sub{margin:10px 0 0;font-size:12.5px;color:var(--success);font-weight:600;line-height:1.6}.open-exam-meta{margin:8px 0 0;font-size:12px;color:var(--muted);line-height:1.6}.open-pill{flex-shrink:0;background:var(--success);color:#fff;padding:4px 12px;border-radius:999px;font-size:11px;font-weight:700;white-space:nowrap}.answer-files{display:flex;flex-direction:column;gap:8px}.answer-file{display:flex;align-items:center;gap:8px}.answer-file-open{flex:1;display:inline-flex;align-items:center;gap:8px;border:1px solid var(--border);background:var(--surface-2);color:var(--text);font-weight:700;font-size:13px;padding:10px 12px;border-radius:var(--radius-sm);text-align:start}.answer-file-open:active{background:var(--border)}.answer-file-del{flex-shrink:0;width:32px;height:32px;border-radius:8px;border:1px solid var(--border);background:var(--surface);color:var(--danger);font-size:14px;line-height:1}.answer-file-del:disabled{opacity:.5}.picked-files{list-style:none;margin:10px 0;padding:0;display:flex;flex-direction:column;gap:6px}.picked-files li{display:flex;align-items:center;gap:8px;background:var(--surface-2);border-radius:8px;padding:7px 10px;font-size:12px}.picked-files li .truncate{flex:1}.exam-meta-row{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-top:10px;padding-top:10px;border-top:1px solid var(--border)}.exam-grade-row{display:flex;align-items:center;justify-content:space-between;margin-top:10px;padding-top:10px;border-top:1px solid var(--border)}.exam-grade-val{font-weight:800;color:var(--success);font-size:14px}.how-toggle{display:inline-flex;align-items:center;gap:6px;border:1px solid var(--border);background:var(--surface);color:var(--secondary-strong);font-size:12.5px;font-weight:700;padding:8px 14px;border-radius:999px;margin:2px 0 var(--gap);cursor:pointer}.how-toggle:active{background:var(--surface-2)}.answer-done{display:inline-flex;align-items:center;gap:6px;color:var(--success);font-weight:700;font-size:13px}.answer-modal{display:flex;flex-direction:column;gap:12px}.answer-modal-img{width:100%;border-radius:var(--radius-sm);display:block;cursor:zoom-in;border:1px solid var(--border)}.toast-stack{position:fixed;top:calc(12px + var(--safe-top));left:50%;transform:translate(-50%);z-index:2000;display:flex;flex-direction:column;gap:8px;width:calc(100% - 28px);max-width:420px;pointer-events:none}.toast{pointer-events:auto;padding:12px 14px;border-radius:var(--radius-sm);font-size:13px;font-weight:700;color:#fff;box-shadow:0 8px 24px #0000002e;text-align:center;animation:toast-in .2s ease}@keyframes toast-in{0%{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:none}}.toast-success{background:var(--success)}.toast-error{background:var(--danger)}.toast-info{background:var(--primary)}.confirm-box{max-width:420px}.confirm-title{font-weight:800;font-size:15px;color:var(--text);margin:0 0 6px}.confirm-msg{color:var(--text);font-size:14px;line-height:1.6;margin:0 0 16px}.confirm-actions{display:flex;gap:10px}.confirm-actions .btn{flex:1}