:root { --bg:#f4f6fb; --card:#fff; --ink:#111827; --muted:#6b7280; --line:#e5e7eb; --pri:#4f46e5; --pri2:#eef2ff; --ok:#16a34a; --okbg:#dcfce7;
  --bad:#dc2626; --badbg:#fee2e2; --warn:#b45309; --warnbg:#fef3c7; --l1:#2563eb; --l2:#ea580c; --radius:12px; font-size:15px; }
* { box-sizing:border-box; }
body { margin:0; font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; background:var(--bg); color:var(--ink); }
a { color:var(--pri); }
header#top { display:flex; align-items:center; gap:16px; padding:8px 18px; background:#fff; border-bottom:1px solid var(--line); position:sticky; top:0; z-index:20; }
.brand { text-decoration:none; color:var(--ink); white-space:nowrap; }
#nav { display:flex; gap:4px; flex-wrap:wrap; flex:1; }
#nav a { padding:6px 10px; border-radius:8px; text-decoration:none; color:var(--ink); font-size:14px; }
#nav a.on, #nav a:hover { background:var(--pri2); color:var(--pri); }
#who { display:flex; gap:10px; align-items:center; font-size:14px; color:var(--muted); white-space:nowrap; }
main { padding:18px; max-width:1500px; margin:0 auto; }
.pad { padding:24px; }
h1 { font-size:24px; margin:4px 0 14px; } h2 { font-size:19px; margin:18px 0 10px; } h3 { margin:6px 0 10px; font-size:16px; }
.muted { color:var(--muted); } .small { font-size:12.5px; }
.card { background:var(--card); border:1px solid var(--line); border-radius:var(--radius); padding:16px; }
.grid2 { display:grid; grid-template-columns: minmax(360px, 1fr) minmax(420px, 1.25fr); gap:16px; align-items:start; }
.grid3 { display:grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap:14px; }
.row { display:flex; gap:8px; align-items:center; flex-wrap:wrap; } .row.end { justify-content:flex-end; } .grow { flex:1; }
.stack > * + * { margin-top:12px; }
button, .btn { font:inherit; padding:8px 14px; border-radius:9px; border:1px solid var(--line); background:#fff; cursor:pointer; color:var(--ink); text-decoration:none; display:inline-flex; gap:6px; align-items:center; }
button:hover { border-color:#c7cbe0; } button:disabled { opacity:.45; cursor:not-allowed; }
button.primary, .btn.primary { background:var(--pri); border-color:var(--pri); color:#fff; } button.primary:hover { filter:brightness(1.08); }
button.big { padding:12px 20px; font-size:16px; font-weight:600; }
button.ok { background:var(--ok); border-color:var(--ok); color:#fff; } button.danger { background:var(--bad); border-color:var(--bad); color:#fff; }
button.sm { padding:4px 9px; font-size:13px; }
input, select, textarea { font:inherit; padding:7px 9px; border:1px solid #cfd4e2; border-radius:8px; background:#fff; color:var(--ink); }
input:focus, select:focus, textarea:focus { outline:2px solid #c7d2fe; border-color:var(--pri); }
label { font-size:13px; color:var(--muted); }
table { border-collapse:collapse; width:100%; font-size:14px; } th, td { padding:6px 8px; border-bottom:1px solid var(--line); text-align:left; }
th { background:#f8fafc; font-weight:600; }
.pill { display:inline-block; padding:2px 9px; border-radius:99px; font-size:12px; background:var(--pri2); color:var(--pri); }
.pill.ok { background:var(--okbg); color:var(--ok); } .pill.bad { background:var(--badbg); color:var(--bad); } .pill.warn { background:var(--warnbg); color:var(--warn); }
.note { padding:10px 12px; border-radius:10px; background:var(--warnbg); color:#713f12; font-size:14px; }
.note.info { background:var(--pri2); color:#312e81; } .note.ok { background:var(--okbg); color:#14532d; } .note.bad { background:var(--badbg); color:#7f1d1d; }
/* modul di beranda */
.tile { display:block; text-decoration:none; color:inherit; background:#fff; border:1px solid var(--line); border-radius:var(--radius); padding:14px; transition:.15s; position:relative; }
.tile:hover { border-color:var(--pri); box-shadow:0 4px 14px #4f46e522; transform:translateY(-1px); }
.tile .ic { font-size:28px; } .tile b { display:block; margin:6px 0 4px; } .tile p { margin:0; font-size:13.5px; color:var(--muted); }
.tile.locked { opacity:.5; pointer-events:none; } .tile .badge { position:absolute; top:10px; right:10px; }
/* viewer */
.viewer { position:relative; background:radial-gradient(ellipse at 50% 30%, #ffffff, #e7ebf5); border-radius:var(--radius); border:1px solid var(--line); overflow:hidden; min-height:320px; }
.viewer canvas { width:100%; height:100%; display:block; position:absolute; inset:0; }
.v-labels { position:absolute; inset:0; pointer-events:none; }
.v-label { position:absolute; left:0; top:0; font-size:12.5px; font-weight:600; background:#ffffffd9; border:1px solid var(--line); padding:1px 6px; border-radius:6px; white-space:nowrap; }
.v-label.ax-x { color:#dc2626; } .v-label.ax-y { color:#16a34a; } .v-label.ax-z { color:#2563eb; }
.v-label.l1 { color:var(--l1); } .v-label.l2 { color:var(--l2); } .v-label.j { color:#7c3aed; } .v-label.big { font-size:15px; }
.v-label.ok { color:var(--ok); } .v-label.bad { color:var(--bad); }
.vbar { position:absolute; left:8px; top:8px; display:flex; gap:4px; z-index:3; } .vbar button { padding:3px 8px; font-size:12px; background:#ffffffe0; }
/* sketsa */
.sketch { width:100%; height:auto; background:#fff; border-radius:10px; border:1px solid var(--line); }
.sketch .grid { stroke:#eef0f5; stroke-width:1; } .sketch .axis { stroke:#9ca3af; stroke-width:1.2; } .sketch .axl { font:600 13px system-ui; fill:#6b7280; }
.sketch text { font:13px system-ui; } .sketch .small { font-size:11.5px; fill:#6b7280; }
.sketch .base { fill:#d6dae5; stroke:#9aa1b5; } .sketch .base2 { fill:#e6e9f1; stroke:#b9bfd0; }
.sketch .jt { fill:#fff; stroke:#111827; stroke-width:2.5; } .sketch .tip { fill:#111827; } .sketch .wrist { fill:none; stroke:#059669; stroke-width:2.5; }
.sketch .arc { fill:none; stroke-width:2.5; } .sketch .reach { fill:none; stroke:#059669; stroke-width:1.5; stroke-dasharray:6 5; opacity:.7; }
.sketch .tri { fill:#05966914; stroke:none; } .sketch .target { fill:#e11d4822; stroke:#e11d48; stroke-width:2; }
.sketch .ghostdh { fill:none; stroke:#ef4444; stroke-width:4; stroke-dasharray:8 5; stroke-linecap:round; } .sketch .ghostt { fill:#ef4444; font-size:12px; font-weight:600; }
.sketch .hl { filter: drop-shadow(0 0 4px #facc15) drop-shadow(0 0 2px #facc15); } .sketch .skt.hl { font-weight:800; }
/* persamaan */
.eqn { font-family: "Cambria Math", "STIX Two Math", "Times New Roman", serif; font-size:19px; line-height:2; }
.eqn sub { font-size:.7em; }
.term { color:var(--c); border-bottom:2px solid transparent; padding:0 2px; border-radius:4px; cursor:default; transition:.15s; }
.term.hl, .term:hover { background:color-mix(in srgb, var(--c) 16%, white); border-bottom-color:var(--c); }
.frac { display:inline-flex; flex-direction:column; vertical-align:middle; text-align:center; margin:0 3px; }
.frac > span:first-child { border-bottom:1.5px solid currentColor; padding:0 4px; } .frac > span { line-height:1.35; }
.sqrt { border-top:1.5px solid currentColor; padding:0 2px; }
.eqline { padding:4px 8px; border-radius:8px; transition:background .3s; } .eqline.new { animation:pop 1s ease; } .eqline.dim { opacity:.35; }
@keyframes pop { from { background:#fef08a; } to { background:transparent; } }
.subst { font-size:15px; color:#374151; padding-left:22px; font-family:ui-monospace, Menlo, monospace; }
/* worksheet */
.ws-field { display:grid; grid-template-columns: 1fr 150px 30px 34px; gap:6px; align-items:center; padding:5px 6px; border-radius:8px; }
.ws-field .lbl { font-size:14.5px; }
.ws-field input, .ws-field select { width:100%; text-align:right; }
.ws-field select { text-align:left; }
.ws-field.benar { background:var(--okbg); } .ws-field.ecf { background:var(--warnbg); } .ws-field.salah, .ws-field.kosong { background:var(--badbg); } .ws-field.na { opacity:.5; }
.ws-field .st { text-align:center; font-size:17px; }
.ws-field .msg { grid-column:1 / -1; font-size:13px; color:#7f1d1d; padding-left:4px; } .ws-field.ecf .msg { color:#713f12; }
.ws-group { font-size:12.5px; font-weight:700; color:var(--muted); text-transform:uppercase; letter-spacing:.04em; margin:12px 0 2px 6px; }
.given { display:flex; gap:8px; flex-wrap:wrap; } .given span { background:#f1f5f9; border-radius:8px; padding:5px 10px; font-weight:600; }
.tabs { display:flex; gap:6px; margin-bottom:12px; flex-wrap:wrap; } .tabs button.on { background:var(--pri); color:#fff; border-color:var(--pri); }
.score { font-size:28px; font-weight:800; }
/* pemutar animasi */
.player { display:grid; grid-template-columns: 1.15fr 1fr; gap:14px; }
.player .stage3d { height:390px; } .player .sk2d { max-width:560px; }
.player .board { min-height:170px; } .narr { font-size:16px; line-height:1.55; background:#111827; color:#f9fafb; border-radius:10px; padding:10px 14px; min-height:58px; }
.steps { display:flex; gap:4px; flex-wrap:wrap; margin:8px 0; } .steps button { padding:3px 9px; font-size:13px; } .steps button.on { background:var(--pri); color:#fff; border-color:var(--pri); }
.steps button.done { border-color:var(--ok); }
.timeline { width:100%; }
.tryit { background:#f8fafc; border:1px dashed #cbd5e1; border-radius:10px; padding:8px 12px; }
.tryit input[type=range] { width:100%; }
.present .player .stage3d { height:62vh; } .present header#top { display:none; } .present main { max-width:none; }
/* modal & toast */
.modal-bg { position:fixed; inset:0; background:#0007; display:grid; place-items:center; z-index:50; }
.modal { background:#fff; border-radius:14px; padding:20px; width:min(560px, 92vw); max-height:86vh; overflow:auto; }
#toasts { position:fixed; right:16px; bottom:16px; display:flex; flex-direction:column; gap:8px; z-index:60; }
.toast { background:#111827; color:#fff; padding:10px 14px; border-radius:10px; max-width:380px; transition:.4s; } .toast.ok { background:var(--ok); } .toast.bad { background:var(--bad); }
.toast.out { opacity:0; transform:translateY(10px); }
.login { max-width:400px; margin:60px auto; }
.login input { width:100%; margin:4px 0 12px; }
.slider { display:grid; grid-template-columns: 34px 1fr 74px; gap:8px; align-items:center; }
.slider input[type=number] { width:74px; }
.kpi { display:flex; gap:12px; flex-wrap:wrap; } .kpi .card { min-width:150px; } .kpi b { font-size:22px; display:block; }
.heat td.h { text-align:center; font-weight:600; }
@media (max-width: 1000px) { .grid2, .player { grid-template-columns: 1fr; } }
@media print { header#top, .noprint { display:none; } }
.prev .eqn { font-size:15px; line-height:1.6; } details summary { cursor:pointer; margin-top:6px; }
.brand { display:flex; align-items:center; gap:9px; font-size:16px; } .brand img { width:36px; height:36px; }