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/* ===== MassiveMark Playground – Compact Print Styles (A4) ===== */
:root {
    --text: #222;
    --muted: #57606a;
    --line: #d0d7de;
    --bg-soft: #f6f8fa;
    --bg-zebra: #fafbfc;
    --brand: #0969da;
    --font: "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, "Noto Sans",
        "Liberation Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
    --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono",
        "Courier New", monospace;
    --fs: 12.2pt;
    --lh: 1.55;
}

/* === Page setup: khổ A4, margin nhỏ, chiếm gần full chiều ngang === */
@page {
    size: A4;
    margin-top: 10mm;
    margin-bottom: 10mm;
    margin-left: 8mm;
    margin-right: 8mm;
}

html,
body {
    color: var(--text);
    font-family: var(--font);
    font-size: var(--fs);
    line-height: var(--lh);
    background: white;
    margin: 0 auto;
    max-width: 190mm;
    /* gần full khổ A4 */
}

/* === Headings === */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 700;
    color: #24292f;
    margin: 1.1em 0 .55em;
}

h1 {
    font-size: 20pt;
    border-bottom: 2px solid var(--line);
    padding-bottom: .25em;
    text-align: center;
}

h2 {
    font-size: 16.8pt;
    border-bottom: 1px solid var(--line);
    padding-bottom: .2em;
    margin-top: 1.2em;
}

h3 {
    font-size: 14pt;
    margin-top: 1em;
}

h4 {
    font-size: 13pt;
    font-weight: 600;
}

/* === Paragraph & Lists === */
p {
    margin: .55em 0;
}

ul,
ol {
    margin: .55em 0 .55em 1.3em;
}

li {
    margin: .15em 0;
}

/* === Tables === */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 1em 0;
    page-break-inside: avoid;
    font-size: 11.5pt;
}

th,
td {
    border: 1px solid var(--line);
    padding: 7px 9px;
    text-align: left;
    vertical-align: top;
}

th {
    background: var(--bg-soft);
    font-weight: 600;
}

tbody tr:nth-child(even) td {
    background: var(--bg-zebra);
}

/* === Code blocks === */
code {
    font-family: var(--mono);
    background: var(--bg-soft);
    border: 1px solid #eaeef2;
    border-radius: 6px;
    padding: 2px 5px;
}

pre {
    font-family: var(--mono);
    background: var(--bg-soft);
    border: 1px solid #eaeef2;
    border-radius: 8px;
    padding: 10px 12px;
    page-break-inside: avoid;
    overflow-x: auto;
}

/* === Links & Blockquotes === */
a {
    color: var(--brand);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

blockquote {
    margin: .8em 0;
    padding: .6em .9em;
    border-left: 4px solid var(--line);
    background: var(--bg-soft);
    color: var(--muted);
    border-radius: 4px;
}

/* === Images === */
img {
    max-width: 100%;
    height: auto;
    page-break-inside: avoid;
    display: block;
    margin: .4em auto;
}

/* === Horizontal lines === */
hr {
    border: none;
    border-top: 1px solid var(--line);
    margin: 1.2em 0;
}

/* === Math (MathJax SVG) === */
mjx-container[jax="SVG"] {
    page-break-inside: avoid;
}

/* === Print optimization === */
@media print {
    * {
        -webkit-print-color-adjust: exact;
        print-color-adjust: exact;
    }
}