/* Guide pages (free-las-viewer, well-log-correlation, free-petrophysics-software): plain, fast, readable without JS. */
:root{ --ground:#EDF0F3; --paper:#FFFFFF; --ink:#172029; --muted:#5C6975; --line:#D5DBE2; --accent:#B4541E; --accent-ink:#FFFFFF; }
:root[data-theme="dark"]{ --ground:#12161B; --paper:#1F262E; --ink:#E4E9EE; --muted:#93A0AD; --line:#2E3740; --accent:#E07A3F; --accent-ink:#12161B; }
*{box-sizing:border-box}
body{margin:0;background:var(--ground);color:var(--ink);font:16px/1.65 "IBM Plex Sans",system-ui,sans-serif}
a{color:var(--accent)}
.top{display:flex;align-items:center;gap:16px;max-width:880px;margin:0 auto;padding:14px 16px}
.top .brand{font-weight:600;color:var(--ink);text-decoration:none;font-size:18px}
.top nav{display:flex;gap:14px;flex-wrap:wrap;font-size:14px;margin-left:auto}
.top nav a{color:var(--muted);text-decoration:none}.top nav a[aria-current]{color:var(--ink);font-weight:600}
main{max-width:880px;margin:0 auto;padding:8px 16px 56px}
article{background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:8px 32px 32px}
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h2{font-size:21px;margin:2em 0 .5em;padding-bottom:4px;border-bottom:1px solid var(--line)}
h3{font-size:17px;margin:1.4em 0 .3em}
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table{border-collapse:collapse;margin:12px 0;width:100%}th,td{border:1px solid var(--line);padding:6px 10px;text-align:left;vertical-align:top}
ol li,ul li{margin:4px 0}
.faq h3{margin-top:1.2em}
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.plug h2{margin:0 0 6px;border:0;padding:0;font-size:18px}.plug p{margin:0 0 10px}
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.related a b{display:block;color:var(--accent)}.related a span{font-size:14px;color:var(--muted)}
footer{max-width:880px;margin:0 auto;padding:0 16px 40px;font-size:13px;color:var(--muted)}footer a{color:var(--muted)}
@media (max-width:600px){ article{padding:4px 18px 24px} h1{font-size:26px} .top nav{display:none} }