/* Excel-Training Wissensdatenbank – Design-System 2026 */
:root{
  --green:#217346;--green-2:#2e8b57;--green-light:#e7f3ec;
  --bg:#ffffff;--fg:#1f2530;--muted:#5c6672;--line:#e3e7ec;
  --card:#ffffff;--code-bg:#f4f6f8;--accent:#217346;
  --cell:#ffffff;--cell-head:#f3f5f7;--cell-line:#c9d2da;--cell-active:#d7eadf;
  --shadow:0 1px 3px rgba(20,30,45,.08),0 8px 24px rgba(20,30,45,.06);
  --maxw:840px;
}
@media (prefers-color-scheme:dark){
  :root{--bg:#12151b;--fg:#e6eaef;--muted:#9aa4b1;--line:#262d38;--card:#171b22;
        --code-bg:#1c212b;--green-light:#12291d;--cell:#171b22;--cell-head:#1f2632;--cell-line:#333c49;}
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--fg);
  font-family:"Segoe UI",-apple-system,BlinkMacSystemFont,Roboto,Helvetica,Arial,sans-serif;
  line-height:1.65;font-size:17px;-webkit-font-smoothing:antialiased}
a{color:var(--green);text-decoration:none}
a:hover{text-decoration:underline}

/* Header / Nav */
.site-header{position:sticky;top:0;z-index:20;background:var(--bg);border-bottom:1px solid var(--line)}
.nav{max-width:1080px;margin:0 auto;display:flex;align-items:center;gap:8px;padding:10px 18px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:9px;font-weight:800;font-size:19px;color:var(--fg);margin-right:auto}
.brand .logo{display:inline-grid;place-items:center;width:30px;height:30px;border-radius:7px;background:var(--green);color:#fff;font-weight:800}
.nav a.item{color:var(--muted);font-weight:600;font-size:15px;padding:7px 11px;border-radius:8px}
.nav a.item:hover{color:var(--fg);background:var(--green-light);text-decoration:none}
.nav a.item.active{color:var(--green);background:var(--green-light)}

/* Layout */
main{max-width:var(--maxw);margin:0 auto;padding:26px 18px 70px}
.crumbs{font-size:13.5px;color:var(--muted);margin:6px 0 18px}
.crumbs a{color:var(--muted)}
h1{font-size:33px;line-height:1.2;margin:.1em 0 .35em;letter-spacing:-.01em}
h2{font-size:23px;margin:1.9em 0 .5em;padding-top:.2em}
h3{font-size:18.5px;margin:1.4em 0 .3em}
.lead{font-size:19px;color:var(--muted);margin:.2em 0 1.4em}
p{margin:.7em 0}
ul,ol{padding-left:1.3em}
li{margin:.3em 0}
hr{border:0;border-top:1px solid var(--line);margin:2.4em 0}

/* Syntax / code */
code{background:var(--code-bg);padding:.12em .4em;border-radius:5px;font-family:"Cascadia Code",Consolas,"SF Mono",Menlo,monospace;font-size:.92em}
.formula{display:block;background:var(--code-bg);border:1px solid var(--line);border-left:4px solid var(--green);
  border-radius:8px;padding:14px 16px;font-family:"Cascadia Code",Consolas,Menlo,monospace;font-size:15.5px;overflow-x:auto;margin:1em 0}
.formula .arg{color:var(--green-2);font-weight:600}

/* Excel-Gitter (ersetzt alte Screenshots) */
.xl{overflow-x:auto;margin:1.2em 0}
table.grid{border-collapse:collapse;font-size:14.5px;min-width:340px;background:var(--cell);
  font-family:"Segoe UI",sans-serif;box-shadow:var(--shadow);border-radius:6px;overflow:hidden}
table.grid th,table.grid td{border:1px solid var(--cell-line);padding:6px 12px;text-align:left;white-space:nowrap}
table.grid thead th,table.grid .rownum{background:var(--cell-head);color:var(--muted);text-align:center;font-weight:600;width:38px}
table.grid td.num{text-align:right;font-variant-numeric:tabular-nums}
table.grid td.hl{background:var(--green-light);font-weight:600}
table.grid caption{caption-side:bottom;color:var(--muted);font-size:13px;padding-top:8px;text-align:left}

/* Boxen */
.box{border:1px solid var(--line);border-radius:12px;padding:16px 18px;margin:1.4em 0;background:var(--card);box-shadow:var(--shadow)}
.box.tip{border-left:4px solid var(--green);background:var(--green-light)}
.box.warn{border-left:4px solid #e0a100}
.box.modern{border-left:4px solid #0b74c4}
.box h3{margin-top:0}
.box .tag{display:inline-block;font-size:12px;font-weight:700;letter-spacing:.03em;text-transform:uppercase;
  color:var(--green);background:var(--bg);border:1px solid var(--line);border-radius:20px;padding:2px 10px;margin-bottom:8px}

/* Karten-Grid (Sektions-Startseiten) */
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:14px;margin:1.4em 0}
.cards a{display:block;border:1px solid var(--line);border-radius:12px;padding:15px 16px;background:var(--card);color:var(--fg);box-shadow:var(--shadow)}
.cards a:hover{border-color:var(--green);text-decoration:none;transform:translateY(-1px);transition:.12s}
.cards .t{font-weight:700;margin-bottom:3px}
.cards .d{font-size:14px;color:var(--muted)}

/* verwandte Links */
.related{display:flex;flex-wrap:wrap;gap:8px;margin:.6em 0}
.related a{font-size:14px;background:var(--green-light);color:var(--green);padding:6px 12px;border-radius:20px}
.related a:hover{text-decoration:none;background:var(--green);color:#fff}

/* Footer */
footer{border-top:1px solid var(--line);background:var(--card)}
.foot{max-width:1080px;margin:0 auto;padding:26px 18px;display:flex;flex-wrap:wrap;gap:24px;justify-content:space-between;font-size:14px;color:var(--muted)}
.foot a{color:var(--muted)}
.foot .col b{color:var(--fg);display:block;margin-bottom:6px}