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input{height:40px}.dialog-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:4px}.dialog-actions button{min-width:96px}.btn-danger{background:var(--danger);color:#fff;font-weight:600}.btn-danger:hover:not(:disabled){filter:brightness(.92)}@media(max-width:480px){.dialog-actions{flex-direction:column-reverse}.dialog-actions button{width:100%;height:44px}}[data-tip]{position:relative}[data-tip]:after{content:attr(data-tip);position:absolute;top:calc(100% + 6px);left:50%;transform:translate(-50%) translateY(-2px);z-index:50;padding:5px 9px;border-radius:6px;background:var(--text);color:var(--surface);font-size:12px;font-weight:500;line-height:1.3;white-space:normal;width:max-content;max-width:260px;text-align:left;pointer-events:none;opacity:0;transition:opacity .12s,transform .12s}.controls [data-tip]:after,.btn-new-lecture[data-tip]:after{left:0;right:auto;transform:translateY(-2px)}.controls [data-tip]:hover:after,.controls [data-tip]:focus-visible:after,.btn-new-lecture[data-tip]:hover:after,.btn-new-lecture[data-tip]:focus-visible:after{transform:translateY(0)}[data-tip]:hover:after,[data-tip]:focus-visible:after{opacity:1;transform:translate(-50%) translateY(0)}.app-bar-actions [data-tip]:after,.user-row-actions [data-tip]:after,.settings-header [data-tip]:after,.toolbar-switches [data-tip]:after,.device-select-label[data-tip]:after{left:auto;right:0;transform:translateY(-2px)}.app-bar-actions [data-tip]:hover:after,.app-bar-actions [data-tip]:focus-visible:after,.user-row-actions [data-tip]:hover:after,.user-row-actions [data-tip]:focus-visible:after,.settings-header [data-tip]:hover:after,.settings-header [data-tip]:focus-visible:after,.toolbar-switches [data-tip]:hover:after,.toolbar-switches [data-tip]:focus-visible:after,.device-select-label[data-tip]:hover:after,.device-select-label[data-tip]:focus-visible:after{transform:translateY(0)}.history-download[open] summary:after{display:none}@media(hover:none){[data-tip]:after{display:none}}.history-tag-kept{background:var(--teal-tint);border-color:transparent;color:var(--teal-ink)}.btn-icon-active{color:var(--teal-ink);background:var(--teal-tint);border-color:transparent}.usage-kept{color:var(--teal-ink);font-weight:500}.btn-icon:disabled{opacity:.35}:root{--brand-navy: #061f52;--brand-blue: #0b74f6;--brand-cyan: #12bceb;--brand-teal: #11d4b2;--bg: #f4f6fa;--surface: #ffffff;--surface-2: #f1f4f9;--border: #dee4ee;--border-strong: #b9c6db;--text: #0f1f3d;--muted: #5b6b86;--faint: #8a97ae;--primary: var(--brand-blue);--primary-hover: #0863d6;--primary-ink: #ffffff;--primary-tint: rgba(11, 116, 246, .1);--accent-ink: var(--brand-navy);--teal-ink: #0a8f77;--teal-tint: rgba(17, 212, 178, .14);--cyan-ink: #0b86ab;--cyan-tint: rgba(18, 188, 235, .14);--danger: #e5484d;--danger-tint: rgba(229, 72, 77, .12);--warning: #d97706;--warning-tint: rgba(217, 119, 6, .12);--shadow: 0 1px 2px rgba(6, 31, 82, .06), 0 8px 24px rgba(6, 31, 82, .05);--shadow-lg: 0 24px 64px rgba(6, 31, 82, .25);--backdrop: rgba(4, 10, 28, .55);--radius-sm: 6px;--radius: 8px;--radius-lg: 12px;--control-h: 36px;color-scheme:light;font-family:Plus Jakarta Sans,Segoe UI,system-ui,-apple-system,sans-serif;line-height:1.5;font-weight:400;color:var(--text);background-color:var(--bg);font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}:root[data-theme=dark]{--bg: #0a1430;--surface: #101d3f;--surface-2: #172650;--border: #243663;--border-strong: #34497a;--text: #e7ecf7;--muted: #9aaac9;--faint: #6d7fa6;--primary-hover: #2f8bff;--accent-ink: var(--brand-blue);--teal-ink: var(--brand-teal);--teal-tint: rgba(17, 212, 178, .16);--cyan-ink: var(--brand-cyan);--danger: #f2555a;--warning: #f59e0b;--shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .25);--shadow-lg: 0 24px 64px rgba(0, 0, 0, .45);--backdrop: rgba(4, 10, 28, .72);color-scheme:dark}*{box-sizing:border-box}body{margin:0;min-width:320px;min-height:100vh}h1,h2,h3{margin:0;font-weight:600;letter-spacing:-.01em}button{font-family:inherit;font-size:14px;font-weight:500;cursor:pointer;border-radius:var(--radius);border:1px solid transparent;padding:0 14px;height:var(--control-h);color:inherit;background:transparent;transition:background-color .15s,border-color .15s,color .15s}button:disabled{cursor:not-allowed;opacity:.55}button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:2px solid var(--primary);outline-offset:2px}input,select,textarea{font-family:inherit;font-size:14px;color:var(--text);background:var(--surface-2);border:1px solid var(--border);border-radius:var(--radius);height:var(--control-h);padding:0 12px}input:focus,select:focus,textarea:focus{outline:none;border-color:var(--primary)}input::placeholder,textarea::placeholder{color:var(--faint)}input:disabled,select:disabled{opacity:.6;cursor:not-allowed}textarea{height:auto;padding:10px 12px;resize:none}code,pre{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}@media(max-width:600px){:root{--control-h: 44px}input,select,textarea{font-size:16px}}