/* Learn to 3Draw — shared styles. Matches manual.html. © 2026 Xtra Ad Service, Inc. */
:root{
  --bg:#0b0e11; --panel:#10151a; --sunk:#0a0d10; --line:#22303a;
  --text:#d9e4e4; --dim:#8fa3a3; --faint:#5d6e6e;
  --phosphor:#3dffa0; --violet:#b18cff; --amber:#ffb545; --rose:#ff7f9e;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--text);font:16px/1.75 'Space Grotesk',system-ui,sans-serif}
a{color:var(--phosphor);text-decoration:none}
a:hover{text-decoration:underline}
img,svg{max-width:100%;height:auto;display:block}
code,kbd{font:13px 'IBM Plex Mono',ui-monospace,monospace;background:#0e1215;border:1px solid var(--line);border-radius:3px;padding:1px 6px;color:var(--amber);overflow-wrap:anywhere}
kbd{color:var(--text)}
pre{background:var(--sunk);border:1px solid var(--line);border-radius:6px;padding:12px 14px;overflow:auto;font:13px/1.6 'IBM Plex Mono',monospace;color:var(--amber);margin:10px 0 16px}
pre code{background:none;border:0;padding:0;color:inherit}
:focus-visible{outline:2px solid var(--amber);outline-offset:2px;border-radius:3px}

/* ---------- header + tabs ---------- */
header.site{border-bottom:1px solid var(--line);background:linear-gradient(180deg,#0e1318,#0b0e11);padding:22px 16px 18px}
.site-inner{max-width:1100px;margin:0 auto;display:flex;justify-content:space-between;align-items:flex-end;gap:16px;flex-wrap:wrap}
.logo{margin:0;font:700 24px 'IBM Plex Mono',monospace;letter-spacing:4px;color:var(--phosphor)}
.logo small{display:block;font:400 11px 'Space Grotesk',sans-serif;letter-spacing:2px;color:var(--dim);margin-top:4px;text-transform:uppercase}
.tabs{display:flex;gap:6px;flex-wrap:wrap}
.tabs a{font:500 11px 'IBM Plex Mono',monospace;letter-spacing:1.2px;text-transform:uppercase;color:var(--dim);
  border:1px solid var(--line);border-radius:4px;padding:7px 11px}
.tabs a:hover{color:var(--phosphor);border-color:var(--phosphor);text-decoration:none}
.tabs a[aria-current="page"]{color:var(--phosphor);border-color:#1f5a3f;background:#0c1712}

/* ---------- guide switcher ---------- */
.switch{border-bottom:1px solid var(--line);background:#0c1014;padding:0 16px}
.switch-inner{max-width:1100px;margin:0 auto;display:flex;gap:4px;overflow-x:auto;scrollbar-width:none}
.switch a{flex:none;padding:13px 14px 11px;font:600 13px 'Space Grotesk',sans-serif;color:var(--dim);border-bottom:2px solid transparent}
.switch a span{font:500 10px 'IBM Plex Mono',monospace;letter-spacing:1px;color:var(--faint);margin-right:7px}
.switch a:hover{color:var(--text);text-decoration:none}
.switch a[aria-current="page"]{color:var(--text);border-bottom-color:var(--phosphor)}
.switch a[aria-current="page"] span{color:var(--phosphor)}

/* ---------- page layout ---------- */
.layout{max-width:1100px;margin:0 auto;display:grid;grid-template-columns:230px minmax(0,1fr);gap:40px;padding:30px 16px 70px}
nav.toc{position:sticky;top:18px;align-self:start;font-size:13.5px;border:1px solid var(--line);border-radius:6px;
  background:var(--panel);padding:14px 14px 16px;max-height:calc(100vh - 36px);overflow:auto}
nav.toc h2{margin:0 0 10px;font:600 11px 'IBM Plex Mono',monospace;letter-spacing:2px;color:var(--violet);text-transform:uppercase}
nav.toc ol{margin:0;padding-left:18px;display:grid;gap:5px}
nav.toc a{color:var(--dim)}
nav.toc a:hover{color:var(--phosphor);text-decoration:none}
main{min-width:0}
.kicker{font:600 11px 'IBM Plex Mono',monospace;letter-spacing:2px;text-transform:uppercase;color:var(--amber);margin:0 0 6px}
h1{font:600 clamp(30px,5vw,44px)/1.08 'Space Grotesk',sans-serif;margin:0 0 14px;letter-spacing:-.01em}
.lead{font-size:18.5px;line-height:1.65;color:var(--text);margin:0 0 22px;max-width:66ch}
article h2{font:600 23px 'Space Grotesk',sans-serif;color:var(--phosphor);margin:54px 0 12px;padding-top:16px;border-top:1px solid var(--line);scroll-margin-top:14px}
article h2 .n{font:500 12px 'IBM Plex Mono',monospace;color:var(--faint);margin-right:10px;vertical-align:3px}
article h3{font:600 17px 'Space Grotesk',sans-serif;color:var(--violet);margin:28px 0 8px}
article p{margin:0 0 14px;max-width:70ch}
article ul,article ol{margin:0 0 16px;padding-left:22px;display:grid;gap:7px;max-width:70ch}
.hint{border-left:3px solid var(--amber);background:#141310;padding:10px 14px;border-radius:0 6px 6px 0;color:#e8d9bd;font-size:15px;margin:16px 0;max-width:70ch}
.hint.green{border-color:var(--phosphor);background:#0e1713;color:#cfe9dc}
.hint.rose{border-color:var(--rose);background:#170f12;color:#f0d3db}
.hint b{color:inherit}
.where{font:500 12.5px 'IBM Plex Mono',monospace;color:var(--dim);margin:-4px 0 12px}
.where b{color:var(--violet);font-weight:500}

/* figures */
figure{margin:18px 0 22px}
figure img,figure svg{border:1px solid var(--line);border-radius:6px;background:#000;width:100%}
figure.diagram svg{background:var(--sunk)}
figcaption{font-size:13.5px;color:var(--dim);margin-top:8px;line-height:1.55}
figcaption code{font-size:12px}
.pair{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:18px 0 22px}
.pair figure{margin:0}
.trio{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:18px 0 22px}
.trio figure{margin:0}

/* steps */
ol.steps{counter-reset:s;list-style:none;padding-left:0;gap:10px}
ol.steps>li{counter-increment:s;position:relative;padding-left:40px}
ol.steps>li::before{content:counter(s);position:absolute;left:0;top:1px;width:26px;height:26px;border-radius:50%;
  border:1px solid var(--phosphor);color:var(--phosphor);font:600 12px/24px 'IBM Plex Mono',monospace;text-align:center}

/* tables */
.tablewrap{overflow-x:auto;margin:14px 0 20px;border:1px solid var(--line);border-radius:6px}
table{width:100%;border-collapse:collapse;font-size:14.5px}
th,td{border-bottom:1px solid var(--line);padding:9px 12px;text-align:left;vertical-align:top}
tr:last-child td{border-bottom:0}
th{background:#10181d;color:var(--violet);font-weight:600;font-size:13px}
td code{white-space:nowrap}
td.eq code{white-space:normal}

/* recipe cards */
.recipes{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:12px;margin:14px 0 20px}
.recipe{background:var(--panel);border:1px solid var(--line);border-radius:8px;padding:12px 14px}
.recipe h4{margin:0 0 6px;font:600 15px 'Space Grotesk',sans-serif}
.recipe code{display:block;white-space:normal;margin:6px 0 4px;padding:6px 8px;line-height:1.5}
.recipe p{margin:6px 0 0;font-size:13.5px;color:var(--dim)}
.copy{font:500 10.5px 'IBM Plex Mono',monospace;letter-spacing:1px;text-transform:uppercase;background:transparent;color:var(--dim);
  border:1px solid var(--line);border-radius:3px;padding:3px 8px;cursor:pointer;margin-top:4px}
.copy:hover{color:var(--phosphor);border-color:var(--phosphor)}

/* exercises */
.drills{display:grid;gap:10px;margin:14px 0 20px;padding:0;list-style:none;max-width:none}
.drills li{background:var(--panel);border:1px solid var(--line);border-radius:8px;padding:12px 16px}
.drills b{color:var(--amber);font:600 12px 'IBM Plex Mono',monospace;letter-spacing:1px;text-transform:uppercase;display:block;margin-bottom:2px}

/* hub cards */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:26px 0 34px}
.card{display:flex;flex-direction:column;background:var(--panel);border:1px solid var(--line);border-radius:10px;overflow:hidden;color:var(--text)}
.card:hover{border-color:#3b5a4f;text-decoration:none}
.card .pic{aspect-ratio:1/1;background:#000;border-bottom:1px solid var(--line)}
.card .pic img,.card .pic svg{width:100%;height:100%;object-fit:cover;border:0;border-radius:0}
.card .body{padding:14px 16px 16px;display:flex;flex-direction:column;gap:6px;flex:1}
.card .body small{font:600 10.5px 'IBM Plex Mono',monospace;letter-spacing:1.6px;text-transform:uppercase;color:var(--amber)}
.card .body h3{margin:0;font:600 20px 'Space Grotesk',sans-serif;color:var(--phosphor)}
.card .body p{margin:0;font-size:14.5px;color:#b9c7c7;line-height:1.6}
.card .body .go{margin-top:auto;padding-top:8px;font:500 12px 'IBM Plex Mono',monospace;color:var(--phosphor)}

/* next / prev */
.pager{display:flex;justify-content:space-between;gap:12px;margin-top:56px;padding-top:18px;border-top:1px solid var(--line);flex-wrap:wrap}
.pager a{display:block;border:1px solid var(--line);border-radius:6px;padding:10px 14px;min-width:200px}
.pager a small{display:block;font:500 10.5px 'IBM Plex Mono',monospace;letter-spacing:1px;text-transform:uppercase;color:var(--dim)}
.pager a:hover{border-color:var(--phosphor);text-decoration:none}
.pager .next{text-align:right;margin-left:auto}

footer.site{border-top:1px solid var(--line);padding:26px 16px 40px;color:var(--dim);font-size:13px}
footer.site .site-inner{align-items:center}
footer.site a{color:var(--dim)}

@media (max-width:860px){
  .layout{grid-template-columns:1fr;gap:18px;padding-top:20px}
  nav.toc{position:static;max-height:none}
  .cards{grid-template-columns:1fr}
  .card{flex-direction:row}
  .card .pic{width:120px;flex:none;aspect-ratio:auto;border-bottom:0;border-right:1px solid var(--line)}
}
@media (max-width:560px){
  body{font-size:15.5px}
  .pair,.trio{grid-template-columns:1fr}
  .card{flex-direction:column}
  .card .pic{width:auto;aspect-ratio:16/9;border-right:0;border-bottom:1px solid var(--line)}
  .lead{font-size:17px}
}
@media print{
  header.site,.switch,nav.toc,.pager,footer.site,.copy{display:none}
  .layout{display:block;padding:0}
  body{background:#fff;color:#000}
  article h2{color:#000}
}