:root{--bg: #ffffff;--fg: #171717;--fg-muted: #666666;--fg-faint: #8f8f8f;--border: #eaeaea;--border-strong: #d4d4d4;--surface: #fafafa;--surface-2: #f5f5f5;--hover: #ededed;--accent: #0070f3;--accent-soft: #e8f1fe;--success: #0c8f56;--radius: 8px;--radius-sm: 6px;--header-h: 60px;--font-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;--font-mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--fg);font-family:var(--font-sans);font-size:14px;line-height:1.7;-webkit-font-smoothing:antialiased;letter-spacing:.003em}button{font-family:inherit}.topbar{position:sticky;top:0;z-index:40;height:var(--header-h);display:flex;align-items:center;gap:14px;padding:0 24px;background:#fffc;-webkit-backdrop-filter:saturate(180%) blur(8px);backdrop-filter:saturate(180%) blur(8px);border-bottom:1px solid 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.chat-bubble{background:var(--accent);border-color:var(--accent);color:#fff}.chat-bubble a{color:var(--accent);text-decoration:underline;word-break:break-all}.chat-msg.mine .chat-bubble a{color:#fff}.chat-bubble-row{display:flex;align-items:flex-end;gap:6px}.chat-msg.mine .chat-bubble-row{flex-direction:row-reverse}.chat-msg-time{flex:none;font-size:11px;color:var(--fg-faint);white-space:nowrap;padding-bottom:2px}.chat-form{display:flex;align-items:flex-end;gap:8px;padding:12px;border-top:1px solid var(--border)}.chat-input{flex:1;min-width:0;border:1px solid var(--border-strong);border-radius:var(--radius-sm);padding:9px 12px;font-size:14px;font-family:inherit;line-height:1.5;resize:none;overflow-y:hidden;min-height:40px;max-height:336px}.chat-input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px 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var(--border);border-radius:13px;background:var(--surface-2);cursor:pointer;line-height:1;transition:background .12s,border-color .12s,transform .08s}.chat-react img{width:18px;height:18px;object-fit:contain;display:block;filter:grayscale(.35);opacity:.75;transition:filter .12s,opacity .12s}.chat-react:hover{border-color:var(--accent);background:var(--accent-soft)}.chat-react:hover img{filter:none;opacity:1}.chat-react:active{transform:scale(.92)}.chat-react.active{border-color:var(--accent);background:var(--accent-soft)}.chat-react.active img{filter:none;opacity:1}.chat-react-count{font-size:12px;font-weight:600;color:var(--accent);font-variant-numeric:tabular-nums}.chat-react-add{position:relative;flex:none;display:flex;align-items:center;padding-bottom:1px}.chat-react-add-btn{display:grid;place-items:center;width:22px;height:22px;padding:0;border:1px solid var(--border);border-radius:50%;background:var(--surface-2);color:var(--fg-muted);cursor:pointer;opacity:0;transition:opacity 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img{width:24px;height:24px;object-fit:contain;display:block}.chat-react-pick:hover{background:var(--accent-soft)}.chat-react-pick:active{transform:scale(.9)}.chat-edit{display:flex;flex-direction:column;gap:6px;width:240px;max-width:100%}.chat-edit-input{width:100%;border:1px solid var(--border-strong);border-radius:var(--radius-sm);padding:8px 10px;font-size:14px;font-family:inherit;line-height:1.5;resize:vertical}.chat-edit-input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}.chat-edit-actions{display:flex;gap:8px}.chat-edit-save{border:none;background:var(--fg);color:#fff;border-radius:var(--radius-sm);font-size:12px;font-weight:600;padding:5px 12px;cursor:pointer}.chat-edit-cancel{border:1px solid var(--border-strong);background:#fff;border-radius:var(--radius-sm);font-size:12px;padding:5px 12px;cursor:pointer}.chat-admin-bar{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:8px 16px;background:#fff7ed;border-bottom:1px solid var(--border)}.chat-admin-tag{font-size:12px;font-weight:700;color:#b45309}.chat-admin-clear{border:1px solid #f1b37a;background:#fff;color:#b45309;border-radius:var(--radius-sm);font-size:12px;font-weight:600;padding:4px 10px;cursor:pointer}.chat-admin-clear:hover{background:#fff1e0}.chat-fab{position:fixed;bottom:20px;right:20px;z-index:50;border:none;background:var(--fg);color:#fff;border-radius:999px;padding:12px 18px;font-size:14px;font-weight:600;cursor:pointer;box-shadow:0 6px 20px #0000002e;transition:background .12s}.chat-fab:hover{background:#383838}.chat-scrim,.scrim{display:none}@media(max-width:900px){.nav-toggle{display:grid;place-items:center}.sidebar{position:fixed;top:var(--header-h);left:0;z-index:50;height:calc(100vh - var(--header-h));background:var(--bg);transform:translate(-100%);transition:transform .2s ease}.sidebar.open{transform:translate(0);box-shadow:0 8px 30px #0000001f}.scrim{display:block;position:fixed;inset:var(--header-h) 0 0 0;z-index:45;background:#0000004d}.content{padding:32px 20px 96px}.lesson-title{font-size:27px}}@media(max-width:1100px){.chat{position:fixed;top:var(--header-h);right:0;bottom:0;height:auto;width:min(360px,88vw);flex:none;z-index:60;box-shadow:-8px 0 30px #0000001f}.chat-scrim{display:block;position:fixed;inset:var(--header-h) 0 0 0;z-index:55;background:#0000004d}}.upload-box{margin-top:20px;padding:18px;border:1px solid var(--border);border-radius:var(--radius);background:var(--surface)}.upload-row{margin-bottom:12px}.upload-pick{display:flex;align-items:center;gap:12px;cursor:pointer;flex-wrap:wrap}.upload-pick input[type=file]{display:none}.upload-pick-btn{display:inline-block;padding:8px 16px;border:1px solid var(--border-strong);border-radius:var(--radius-sm);background:var(--bg);font-size:14px;font-weight:600;white-space:nowrap}.upload-pick:hover .upload-pick-btn{background:var(--hover)}.upload-pick-name{color:var(--fg-muted);font-size:14px;word-break:break-all}.upload-note{width:100%;padding:9px 12px;border:1px solid var(--border-strong);border-radius:var(--radius-sm);font-size:14px;font-family:inherit;background:var(--bg);color:var(--fg)}.upload-note:focus{outline:none;border-color:var(--accent)}.upload-submit-row{display:flex;align-items:stretch;gap:10px}.upload-submit-row .upload-note{flex:1 1 auto;min-width:0}.upload-btn{flex:none;padding:9px 20px;border:none;border-radius:var(--radius-sm);background:var(--accent);color:#fff;font-size:14px;font-weight:600;cursor:pointer;white-space:nowrap}.upload-btn:hover:not(:disabled){background:#005fd1}.upload-btn:disabled{opacity:.5;cursor:not-allowed}.upload-error{margin:12px 0 0;color:#c0392b;font-size:14px}.file-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:10px}.file-item{display:flex;align-items:center;gap:14px;padding:14px 16px;border:1px solid var(--border);border-radius:var(--radius);background:var(--bg)}.file-kind{flex:none;display:inline-flex;align-items:center;justify-content:center;min-width:56px;height:28px;padding:0 8px;border-radius:999px;background:var(--accent-soft);color:var(--accent);font-size:12px;font-weight:700}.file-main{flex:1 1 auto;min-width:0}.file-name{display:inline-block;color:var(--accent);font-weight:600;font-size:15px;text-decoration:none;word-break:break-all}.file-name:hover{text-decoration:underline}.file-note{margin:4px 0 0;font-size:13px;color:var(--fg);word-break:break-word}.file-meta{margin:4px 0 0;font-size:12px;color:var(--fg-faint)}.file-actions{flex:none;display:flex;align-items:center;gap:10px}.file-icon-btn{display:inline-flex;align-items:center;justify-content:center;width:36px;height:36px;border:1px solid var(--border-strong);border-radius:var(--radius-sm);background:var(--bg);color:var(--fg-muted);cursor:pointer;text-decoration:none;transition:background .12s,color .12s,border-color .12s}.file-dl:hover{background:var(--accent-soft);border-color:var(--accent);color:var(--accent)}.file-del:hover{background:#fdecea;border-color:#c0392b;color:#c0392b}@media(max-width:560px){.file-item{flex-wrap:wrap}.file-actions{width:100%;justify-content:flex-end}}