:root{--bg:#fbfaf7;--fg:#1f2430;--muted:#667085;--line:#e4e0d6;--accent:#1d4ed8;--accent-soft:#e8eefc;
--note:#fff7e0;--note-b:#e8c764;--ex:#eef6f0;--ex-b:#6aa57b;--def:#eef1fb;--def-b:#6b7fd6}
@media (prefers-color-scheme:dark){:root{--bg:#14161b;--fg:#e8e9ee;--muted:#9aa1b2;--line:#2a2e38;--accent:#8fb0ff;--accent-soft:#1c2540;
--note:#2a2410;--note-b:#a88a2a;--ex:#15251b;--ex-b:#4d8a60;--def:#181e36;--def-b:#6b7fd6}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.7 Georgia,'Times New Roman',serif}
a{color:var(--accent)}
.top{display:flex;justify-content:space-between;align-items:center;padding:12px 24px;border-bottom:1px solid var(--line);position:sticky;top:0;background:var(--bg);z-index:5;font-family:system-ui,sans-serif}
.brand{font-weight:700;text-decoration:none;font-size:1.1rem}
.top nav a{margin-left:18px;text-decoration:none;color:var(--muted)}
.layout{display:grid;grid-template-columns:300px 1fr;max-width:1300px;margin:0 auto}
.side{padding:20px 16px;border-right:1px solid var(--line);font:14px/1.5 system-ui,sans-serif;position:sticky;top:55px;align-self:start;max-height:calc(100vh - 55px);overflow:auto}
.side summary{cursor:pointer;font-weight:600;padding:6px 0}
.side ul{list-style:none;padding-left:10px;margin:4px 0 10px}
.side li{padding:3px 0}.side li a{text-decoration:none}
.side .soon{color:var(--muted);opacity:.7}
main{padding:28px 40px 60px;min-width:0}
h1{font-family:system-ui,sans-serif;font-size:1.9rem;line-height:1.25;margin:.2em 0 .6em}
.materi h2{font-family:system-ui,sans-serif;font-size:1.4rem;margin:2em 0 .5em;border-bottom:2px solid var(--line);padding-bottom:.2em}
.materi h3{font-family:system-ui,sans-serif;font-size:1.12rem;margin:1.6em 0 .4em}
.crumb{font:13px system-ui,sans-serif;color:var(--muted);margin:0}
.lead{font-size:1.1rem;color:var(--muted)}
.box{border-left:4px solid;border-radius:6px;padding:.7em 1.1em;margin:1.2em 0}
.box>.t{font:700 .8rem system-ui,sans-serif;text-transform:uppercase;letter-spacing:.06em;margin-bottom:.3em;display:block}
.def{background:var(--def);border-color:var(--def-b)}
.note{background:var(--note);border-color:var(--note-b)}
.ex{background:var(--ex);border-color:var(--ex-b)}
.box p:last-child{margin-bottom:0}
figure{margin:1.4em 0;text-align:center}
figure img{max-width:100%;border:1px solid var(--line);border-radius:8px;background:#fff}
figcaption{font:13px system-ui,sans-serif;color:var(--muted);margin-top:.4em}
table.t{border-collapse:collapse;margin:1em auto;font-size:.95rem}
table.t th,table.t td{border:1px solid var(--line);padding:5px 12px;text-align:center}
table.t th{background:var(--accent-soft)}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:16px;margin-top:24px}
.card{border:1px solid var(--line);border-radius:12px;padding:18px;position:relative;font-family:system-ui,sans-serif}
.card h2{margin:0;font-size:1.3rem}.card h3{margin:.2em 0 .5em;font-weight:500;font-size:1rem}
.card.disabled{opacity:.6}
.badge{position:absolute;right:14px;top:14px;font-size:11px;padding:2px 8px;border-radius:99px;background:var(--accent-soft)}
.btn{display:inline-block;background:var(--accent);color:#fff;padding:7px 14px;border-radius:8px;text-decoration:none;font-size:14px}
.pager{display:flex;justify-content:space-between;gap:12px;margin-top:48px;padding-top:16px;border-top:1px solid var(--line);font-family:system-ui,sans-serif;font-size:14px}
.foot{text-align:center;color:var(--muted);font:13px system-ui,sans-serif;padding:24px;border-top:1px solid var(--line)}
form.calc{display:grid;gap:10px;max-width:640px;font-family:system-ui,sans-serif}
form.calc input,form.calc select{padding:8px;border:1px solid var(--line);border-radius:6px;font:inherit;background:var(--bg);color:var(--fg)}
form.calc button{padding:9px 16px;border:0;border-radius:8px;background:var(--accent);color:#fff;font:inherit;cursor:pointer}
pre{background:var(--accent-soft);padding:12px;border-radius:8px;overflow:auto;font-size:.9rem}
@media(max-width:860px){.layout{grid-template-columns:1fr}.side{position:static;max-height:none;border-right:0;border-bottom:1px solid var(--line)}main{padding:20px 16px}}

/* ===== Watermark & unduhan ===== */
.dl{display:flex;flex-wrap:wrap;gap:10px;margin:14px 0 4px;font-family:system-ui,sans-serif;font-size:14px}
.dl a{border:1px solid var(--accent);border-radius:8px;padding:6px 12px;text-decoration:none}
.byline{font:600 13px system-ui,sans-serif;color:var(--muted)}
.katex{font-size:1.06em}.katex-display{overflow-x:auto;overflow-y:hidden;padding:2px 0}
@media print{
 :root{--bg:#fff;--fg:#000}
 body{font-size:11.5pt;background:#fff;color:#000}
 .top,.side,.pager,.dl,.foot nav{display:none!important}
 .layout{display:block}main{padding:0}
 .box,figure,table{break-inside:avoid}
 h1,h2,h3{break-after:avoid}
 .printhead{display:block!important}
}
.printhead{display:none;font:600 10pt system-ui,sans-serif;color:#555;border-bottom:1px solid #aaa;margin-bottom:12pt;padding-bottom:4pt}

/* ===== Kredit pembuat ===== */
.credit{font:700 1rem system-ui,sans-serif;margin:0 0 14px;color:var(--fg)}
.badge-fixed{position:fixed;left:18px;bottom:18px;z-index:60;background:#6aa3dc;color:#0f1720;
 padding:11px 20px;border-radius:999px;font:500 15px system-ui,sans-serif;box-shadow:0 2px 10px rgba(0,0,0,.3);pointer-events:none}
@media print{.badge-fixed{display:none}.credit{display:none}}