Rust learning: lessons, notes, and exercise crates
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/* Shared stylesheet for all lessons and reference docs. Quiet, humanist sans, generous size.
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Dark by default; the print block below swaps back to ink-on-paper. */
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:root {
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--ink: #e4e1d9;
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--paper: #15171b;
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--muted: #9b978d;
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--rule: #2f333a;
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--panel: #1d2025;
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--panel-hover: #24282e;
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--accent: #e3a172;
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--good: #74c48a;
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--good-bg: #172a1d;
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--bad: #e8796e;
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--bad-bg: #2b1715;
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color-scheme: dark;
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}
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* { box-sizing: border-box; }
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body {
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max-width: 40em;
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margin: 3rem auto 6rem;
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padding: 0 1.5rem;
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background: var(--paper);
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color: var(--ink);
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font-family: "Inter", "Ubuntu Sans", Ubuntu, system-ui, "Segoe UI", -apple-system,
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"Noto Sans", "DejaVu Sans", sans-serif;
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font-size: 1.2rem;
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line-height: 1.68;
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-webkit-font-smoothing: antialiased;
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}
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h1, h2, h3 {
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font-weight: 600;
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line-height: 1.25;
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}
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h1 { font-size: 2.1rem; margin-bottom: 0.2rem; letter-spacing: -0.01em; }
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h1 + .subtitle { color: var(--muted); font-size: 1.02rem; margin-top: 0; margin-bottom: 2rem; }
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h2 { font-size: 1.45rem; margin-top: 2.5rem; border-top: 1px solid var(--rule); padding-top: 1.5rem; }
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a { color: var(--accent); text-decoration: underline dotted; text-underline-offset: 2px; }
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a:hover { text-decoration-style: solid; }
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code, pre {
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font-family: "JetBrains Mono", "Cascadia Mono", "DejaVu Sans Mono",
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"Ubuntu Sans Mono", Consolas, Menlo, monospace;
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font-size: 0.87em;
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font-variant-ligatures: none;
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}
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pre {
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background: var(--panel);
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/* Smaller than inline code, so long rustc output overflows by as little as possible.
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Wrapping is not an option: the `^^^^` underlines must stay column-aligned or they
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point at the wrong token. Blocks that still exceed the column scroll sideways. */
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font-size: 0.73em;
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line-height: 1.5;
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border: 1px solid var(--rule);
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border-radius: 4px;
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padding: 0.9em 1em;
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overflow-x: auto;
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}
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code { background: var(--panel); padding: 0.1em 0.3em; border-radius: 3px; }
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pre code { background: none; padding: 0; font-size: 1em; } /* no compounding */
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.cite {
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font-size: 0.85em;
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color: var(--muted);
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border-left: 2px solid var(--rule);
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padding-left: 0.7em;
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margin: 0.5em 0 0;
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}
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.callout {
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border: 1px solid var(--rule);
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background: var(--panel);
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border-radius: 6px;
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padding: 1em 1.2em;
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margin: 1.5rem 0;
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font-size: 0.95em;
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}
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/* Quoted primary sources — verbatim text from the book, std docs, or guidelines */
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blockquote {
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margin: 1.5rem 0 0.4rem;
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padding: 0.2em 0 0.2em 1.1em;
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border-left: 3px solid var(--accent);
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color: var(--ink);
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font-size: 0.97em;
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}
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blockquote p { margin: 0.4em 0; }
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blockquote + .cite { margin-top: 0; }
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/* Coverage tables: a cell that names a real gap */
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.gap { color: var(--bad); font-weight: 600; }
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/* Quiz widget */
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.q {
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border-top: 1px solid var(--rule);
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padding: 1.4rem 0;
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}
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.q .topic {
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display: inline-block;
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font-size: 0.75rem;
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letter-spacing: 0.04em;
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text-transform: uppercase;
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color: var(--muted);
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margin-bottom: 0.4em;
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}
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.q .prompt { margin: 0 0 0.8em; }
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.q button {
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font-family: inherit;
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color: inherit;
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font-size: 0.92rem;
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background: transparent;
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border: 1px solid var(--rule);
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border-radius: 4px;
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padding: 0.35em 0.8em;
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cursor: pointer;
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margin: 0.2em 0.4em 0.2em 0;
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}
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.q button:hover:not(:disabled) { background: var(--panel-hover); }
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.q button:disabled { cursor: default; }
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.options { display: flex; flex-direction: column; align-items: flex-start; }
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.opt { text-align: left; width: 100%; }
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.opt.correct, .grade button.opt-correct { border-color: var(--good); background: var(--good-bg); color: var(--good); }
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.opt.incorrect, .grade button.opt-incorrect { border-color: var(--bad); background: var(--bad-bg); color: var(--bad); }
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.q button:disabled { opacity: 1; }
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.grade button:disabled:not(.opt-correct):not(.opt-incorrect) { opacity: 0.45; }
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.answer, .explain {
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background: var(--panel);
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border-left: 3px solid var(--accent);
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padding: 0.7em 1em;
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margin-top: 0.6em;
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}
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.grade button[data-grade="hit"]:hover { border-color: var(--good); }
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.grade button[data-grade="miss"]:hover { border-color: var(--bad); }
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.hidden { display: none !important; }
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#summary {
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margin-top: 2.5rem;
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border-top: 2px solid var(--ink);
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padding-top: 1rem;
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}
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#summary-body { white-space: pre-line; }
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#report-output {
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white-space: pre-line;
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background: var(--panel);
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padding: 0.8em 1em;
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border-radius: 4px;
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margin-top: 0.8em;
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}
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/* Collapsible hints */
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details {
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border: 1px solid var(--rule);
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border-radius: 6px;
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padding: 0.6em 1em;
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margin: 0.7rem 0;
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background: var(--panel);
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}
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details[open] { background: var(--panel-hover); }
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summary {
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cursor: pointer;
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font-weight: 600;
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color: var(--accent);
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}
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details > *:last-child { margin-bottom: 0; }
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/* Spec tables */
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table {
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border-collapse: collapse;
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width: 100%;
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margin: 1rem 0;
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font-size: 0.95em;
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}
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th, td {
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border-bottom: 1px solid var(--rule);
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padding: 0.4em 0.6em;
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text-align: left;
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vertical-align: top;
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}
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th { border-bottom: 2px solid var(--ink); }
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footer {
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margin-top: 3rem;
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padding-top: 1.5rem;
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border-top: 1px solid var(--rule);
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color: var(--muted);
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font-size: 0.9rem;
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}
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@media print {
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:root {
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--ink: #1a1a1a;
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--paper: #fff;
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--muted: #555;
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--rule: #ccc;
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--panel: #f4f2ec;
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--panel-hover: #eeece5;
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--accent: #8a3324;
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--good: #2a7a3b;
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--good-bg: #eaf5ec;
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--bad: #a3312a;
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--bad-bg: #fbeceb;
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color-scheme: light;
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}
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body { margin: 0.5rem auto; }
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.hidden { display: block !important; }
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.q button, #report-btn { display: none !important; }
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pre { font-size: 0.62em; } /* paper is narrower than a screen, and cannot scroll */
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pre, blockquote, table, .q { break-inside: avoid; }
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}
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