:root{
  --bg:#0b1220; --bg2:#111c31; --card:#16233c; --card2:#1b2b48;
  --line:#24385c; --txt:#e8eefc; --dim:#93a4c4;
  --acc:#4f9cf9; --acc2:#22d3a6; --warn:#f5a524; --bad:#f2545b;
  --r:14px;
}
[data-theme="light"]{
  --bg:#f4f7fd; --bg2:#ffffff; --card:#ffffff; --card2:#eef3fb;
  --line:#d7e1f0; --txt:#12203a; --dim:#5b6c88;
  --acc:#1f6feb; --acc2:#0f9d76; --warn:#b8730d; --bad:#c8303a;
}
*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
body{
  background:radial-gradient(1200px 700px at 85% -10%,rgba(79,156,249,.13),transparent 60%),var(--bg);
  color:var(--txt);font:15px/1.55 system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--acc);text-decoration:none}
button{font:inherit;cursor:pointer;border:0;background:none;color:inherit}

/* ---------- header ---------- */
header{
  position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:12px;
  padding:12px 18px;background:color-mix(in srgb,var(--bg) 82%,transparent);
  backdrop-filter:blur(12px);border-bottom:1px solid var(--line);
}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;letter-spacing:-.2px}
.brand .logo{
  width:34px;height:34px;border-radius:10px;display:grid;place-items:center;
  background:linear-gradient(135deg,var(--acc),var(--acc2));color:#04121f;font-weight:800;font-size:17px;
  box-shadow:0 6px 18px rgba(79,156,249,.35)
}
.brand small{display:block;font-size:11px;font-weight:500;color:var(--dim);letter-spacing:0}
.spacer{flex:1}
.iconbtn{
  width:38px;height:38px;border-radius:11px;display:grid;place-items:center;
  border:1px solid var(--line);background:var(--card);font-size:16px;transition:.15s
}
.iconbtn:hover{border-color:var(--acc);transform:translateY(-1px)}

/* ---------- layout ---------- */
.layout{display:grid;grid-template-columns:250px 1fr;gap:18px;max-width:1240px;margin:0 auto;padding:18px}
nav#nav{
  position:sticky;top:78px;align-self:start;background:var(--card);border:1px solid var(--line);
  border-radius:var(--r);padding:8px;max-height:calc(100vh - 100px);overflow:auto
}
nav#nav .navtitle{font-size:11px;text-transform:uppercase;letter-spacing:.09em;color:var(--dim);padding:8px 10px 6px}
nav#nav a{
  display:flex;gap:10px;align-items:center;padding:9px 11px;border-radius:10px;color:var(--txt);
  font-size:14px;transition:.12s
}
nav#nav a .ic{width:22px;text-align:center;font-size:15px}
nav#nav a:hover{background:var(--card2)}
nav#nav a.on{background:linear-gradient(135deg,rgba(79,156,249,.22),rgba(34,211,166,.14));color:var(--acc);font-weight:600}

main#main{min-width:0}
.hero{
  background:linear-gradient(135deg,var(--card),var(--bg2));border:1px solid var(--line);
  border-radius:var(--r);padding:22px 24px;margin-bottom:16px
}
.hero h1{font-size:23px;letter-spacing:-.4px;margin-bottom:6px}
.hero p{color:var(--dim);font-size:14px;max-width:62ch}
.hero .tag{
  display:inline-block;margin-top:12px;font-size:11.5px;padding:5px 10px;border-radius:99px;
  background:rgba(34,211,166,.13);color:var(--acc2);border:1px solid rgba(34,211,166,.3)
}

/* ---------- cards ---------- */
.grid{display:grid;gap:14px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:16px}
.card h2{font-size:16px;margin-bottom:4px;letter-spacing:-.2px}
.card .sub{color:var(--dim);font-size:13px;margin-bottom:12px}
.row{display:flex;gap:14px;flex-wrap:wrap}
.col{flex:1 1 260px;min-width:0}

/* modul layout */
.mod{display:grid;grid-template-columns:1fr;gap:14px}
@media(min-width:900px){.mod{grid-template-columns:300px 1fr}}
.controls{display:flex;flex-direction:column;gap:14px}
.ctl label{display:flex;justify-content:space-between;font-size:13px;color:var(--dim);margin-bottom:6px}
.ctl label b{color:var(--txt);font-variant-numeric:tabular-nums}
input[type=range]{
  -webkit-appearance:none;appearance:none;width:100%;height:6px;border-radius:99px;
  background:var(--card2);outline:none
}
input[type=range]::-webkit-slider-thumb{
  -webkit-appearance:none;width:18px;height:18px;border-radius:50%;
  background:linear-gradient(135deg,var(--acc),var(--acc2));border:2px solid var(--bg);
  box-shadow:0 2px 8px rgba(0,0,0,.4);cursor:pointer
}
input[type=range]::-moz-range-thumb{
  width:16px;height:16px;border-radius:50%;background:var(--acc);border:2px solid var(--bg);cursor:pointer
}
select,input[type=text],textarea{
  width:100%;background:var(--bg2);color:var(--txt);border:1px solid var(--line);
  border-radius:10px;padding:9px 11px;font:inherit;font-size:14px
}
textarea{resize:vertical;min-height:78px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:13px}
select:focus,textarea:focus,input:focus{outline:2px solid rgba(79,156,249,.45);outline-offset:1px;border-color:var(--acc)}
.seg{display:flex;gap:6px;background:var(--card2);padding:4px;border-radius:10px}
.seg button{flex:1;padding:7px;border-radius:7px;font-size:13px;color:var(--dim);transition:.12s}
.seg button.on{background:var(--acc);color:#04121f;font-weight:600}

/* canvas */
.stage{position:relative;background:var(--bg2);border:1px solid var(--line);border-radius:var(--r);overflow:hidden}
canvas{display:block;width:100%;height:420px;touch-action:none}
@media(max-width:700px){canvas{height:320px}}

/* hasil */
.out{display:grid;grid-template-columns:repeat(auto-fit,minmax(132px,1fr));gap:10px;margin-top:12px}
.kpi{background:var(--card2);border:1px solid var(--line);border-radius:11px;padding:10px 12px}
.kpi .k{font-size:11px;text-transform:uppercase;letter-spacing:.07em;color:var(--dim)}
.kpi .v{font-size:17px;font-weight:700;margin-top:2px;font-variant-numeric:tabular-nums;letter-spacing:-.3px}
.kpi.good .v{color:var(--acc2)}
.kpi.warn .v{color:var(--warn)}
.kpi.bad .v{color:var(--bad)}
.formula{
  margin-top:12px;padding:11px 13px;border-radius:11px;background:var(--bg2);
  border:1px dashed var(--line);font-family:ui-monospace,SFMono-Regular,Menlo,monospace;
  font-size:13.5px;color:var(--acc);overflow-x:auto;white-space:nowrap
}
.note{font-size:12.5px;color:var(--dim);margin-top:10px;line-height:1.6}
.legend{display:flex;gap:14px;flex-wrap:wrap;font-size:12px;color:var(--dim);margin-top:8px}
.legend i{display:inline-block;width:14px;height:3px;border-radius:2px;margin-right:5px;vertical-align:middle}

/* kartu topik (beranda) */
.topic{
  display:flex;gap:12px;align-items:flex-start;padding:14px;border-radius:12px;
  background:var(--card2);border:1px solid transparent;transition:.14s;color:inherit
}
.topic:hover{border-color:var(--acc);transform:translateY(-2px)}
.topic .tic{font-size:20px;line-height:1.2}
.topic b{display:block;font-size:14px;margin-bottom:2px}
.topic span{font-size:12.5px;color:var(--dim)}

footer{max-width:1240px;margin:0 auto;padding:22px 18px 40px;color:var(--dim);font-size:12.5px;display:flex;gap:10px;flex-wrap:wrap;align-items:center;border-top:1px solid var(--line)}
footer .spacer{flex:1}
.pill{font-size:11px;padding:4px 9px;border-radius:99px;background:var(--card2);border:1px solid var(--line)}

@media(max-width:820px){
  .layout{grid-template-columns:1fr;padding:12px}
  nav#nav{position:static;max-height:none;display:flex;overflow-x:auto;gap:6px;padding:6px}
  nav#nav .navtitle{display:none}
  nav#nav a{white-space:nowrap;padding:8px 12px}
  nav#nav a .ic{display:none}
}