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#1b4bc4;--accent-soft: #eff4ff;--accent-line: #cbdcfd;--var: #6438b8;--var-soft: #f4f1fd;--var-line: #ddd2f7;--ok: #0f7b52;--ok-soft: #edf8f3;--bad: #c8352a;--bad-soft: #fdf2f1;--easy: #12876a;--easy-soft: #e9f7f2;--medium: #b06a05;--medium-soft: #fdf4e6;--hard: #c8352a;--hard-soft: #fdf2f1;--r-sm: 10px;--r: 14px;--r-lg: 18px;--shadow: 0 1px 2px rgba(17, 19, 24, .05), 0 10px 30px rgba(17, 19, 24, .06);--bg-blur: rgba(255, 255, 255, .82);--shadow-bar: 0 1px 0 rgba(17, 19, 24, .05), 0 6px 16px -8px rgba(17, 19, 24, .18);--gutter: 20px;--max-w: 700px}*,*:before,*:after{box-sizing:border-box}html{height:100%}body{min-height:100%;overflow-x:clip}body{margin:0;background:var(--bg);color:var(--ink);font-family:DM Sans,-apple-system,BlinkMacSystemFont,Segoe 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ease}.input::placeholder,.textarea::placeholder{color:var(--faint)}.input:focus,.textarea:focus,.select:focus{border-color:var(--accent);box-shadow:0 0 0 4px var(--accent-soft)}.textarea{min-height:150px;resize:vertical;line-height:1.6}.select{-webkit-appearance:none;-moz-appearance:none;appearance:none;padding-right:40px;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8' fill='none'%3E%3Cpath d='M1 1.5 6 6.5l5-5' stroke='%237c828d' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 16px center}.pill{display:inline-flex;align-items:center;gap:4px;padding:3px 10px;border-radius:999px;background:var(--track);font-size:.76rem;font-weight:500;color:var(--muted);white-space:nowrap;letter-spacing:0}.pill-accent{color:var(--accent);background:var(--accent-soft)}.segmented{display:grid;grid-auto-flow:column;grid-auto-columns:1fr;gap:2px;padding:3px;background:var(--track);border-radius:12px}.seg{min-height:36px;border-radius:9px;font-size:.86rem;font-weight:500;color:var(--muted);transition:background .16s ease,color .16s ease}.seg.active{background:var(--surface);color:var(--ink);font-weight:700;box-shadow:0 1px 3px #1113181a}.muted{color:var(--muted)}.tex-error{color:var(--bad);font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.85em}.rich{overflow-wrap:anywhere}.rich>:first-child{margin-top:0}.rich ul,.rich ol{padding-left:1.25em;margin:0 0 .85em}.rich li{margin-bottom:.2em}.rich table{border-collapse:collapse;width:100%;font-size:.9rem;margin-bottom:.85em}.rich th,.rich td{border:1px solid var(--line);padding:8px 12px;text-align:left}.rich th{background:var(--line-soft);font-weight:500}.rich code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.88em;background:var(--line-soft);padding:2px 6px;border-radius:6px}.rich pre{overflow-x:auto;background:var(--line-soft);padding:14px;border-radius:var(--r)}.rich blockquote{margin:0 0 .85em;padding-left:14px;border-left:3px solid var(--accent-line);color:var(--muted)}.rich .katex-display{overflow-x:auto;overflow-y:hidden;padding:4px 0;margin:.8em 0}.katex{font-size:1.05em}.scroll-x{overflow-x:auto;-webkit-overflow-scrolling:touch;scrollbar-width:none}.scroll-x::-webkit-scrollbar{display:none}@media (min-width: 640px){:root{--gutter: 28px}}