.skip-link:not(:focus){clip-path:inset(50%);width:1px;height:1px;padding:0}
.f-grid .a-tile-formula{visibility:visible}
.f-main{max-width:960px;margin:0 auto;padding:24px 16px 48px;line-height:1.6}.f-main h1{font-size:clamp(24px,5vw,34px);line-height:1.2}.f-main h2{font-size:21px}.f-main h3{font-size:17px}.f-header{flex-wrap:wrap;gap:12px}.f-header nav{display:flex;flex-wrap:wrap;gap:8px}.f-header nav a{display:flex;align-items:center;min-height:44px;padding:5px 8px;line-height:1.3}.f-header .a-brand{min-height:44px;display:flex;align-items:center}.f-header .a-brand img{max-width:200px;width:100%;height:auto}.f-main button:not(.lab *),.f-main input,.f-main select,.f-button{font:inherit;min-height:44px;min-width:44px;box-sizing:border-box;max-width:100%}.f-main button:not(.lab *),.f-button{display:inline-flex;justify-content:center;align-items:center;padding:8px 12px;white-space:normal;background:#142333;border:1px solid #5d8199;border-radius:8px;color:#edf5fb;text-decoration:none;line-height:1.35;cursor:pointer}.f-main button:not(.lab *):disabled{opacity:.5;cursor:default}.f-main input,.f-main select{background:#0a1622;color:#edf5fb;border:1px solid #5d8199;border-radius:5px;padding:8px;width:100%}.f-main :focus-visible,.f-header :focus-visible,.f-footer :focus-visible{outline:3px solid #a3defa;outline-offset:3px}.f-main button:not(.lab *)[aria-pressed=true]{background:#365f78;border-color:#a3defa}.f-footer{max-width:960px;margin:auto;display:flex;flex-wrap:wrap;gap:16px;padding:16px}.f-footer a{min-height:44px;display:flex;align-items:center}.f-muted{color:#b1c0cb}.f-note,.f-status{border-left:3px solid #91d4f2;padding:10px 12px;background:#0f1d2b;margin:16px 0;overflow-wrap:anywhere}.f-tools{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0}.f-grid.a-available-topics{grid-template-columns:repeat(3,minmax(0,1fr))}.f-grid .a-learning-card{height:120px;min-height:120px;padding:7px;box-sizing:border-box}.f-panel{padding:16px;border:1px solid #294154;border-radius:10px;background:#0d1926;margin:16px 0}.f-panel p{margin:10px 0}.f-fields{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.f-fields label,.f-field{display:flex;flex-direction:column;gap:6px;min-width:0}.f-objects,.f-piece-list{display:flex;flex-wrap:wrap;gap:8px}.f-objects button,.f-piece-list button{min-width:44px;flex:0 0 auto}.f-workspace{margin:16px 0}.f-diagram{display:block;width:100%;height:auto;max-width:740px;min-width:0;overflow:visible;background:#0b1521;border-radius:8px}.f-diagram rect,.f-diagram circle{fill:#365f78;stroke:#a3defa;stroke-width:1}.f-diagram .f-empty{fill:#122535;stroke:#7391a5}.f-diagram .f-selected{fill:#91d4f2;stroke:#d4efff}.f-diagram text{fill:#edf5fb;font:15px system-ui,sans-serif}.f-diagram line,.f-diagram path{stroke:#b8d7e9;stroke-width:2;fill:none}.f-diagram .f-boundary{stroke:#a3defa;stroke-width:4}.f-result{overflow-wrap:anywhere}.f-result[data-status=correct]{border-left-color:#8ccea9}.f-result[data-status=incorrect]{border-left-color:#da9797}.f-history{padding-left:24px}.f-history li{margin-bottom:10px;overflow-wrap:anywhere}.f-help{white-space:normal}.f-inline-math .math-notation{display:inline-block;margin:0 3px}.f-legend{font-size:14px;color:#b1c0cb}.f-media-empty{padding:22px;border:1px dashed #7391a5;border-radius:8px}.f-section-links{display:flex;flex-wrap:wrap;gap:8px}.f-section-links a{min-height:44px;display:flex;align-items:center;padding:8px}.f-counts{display:flex;flex-wrap:wrap;gap:10px}.f-operator{font-size:22px;text-align:center}.f-equation{font-size:22px;overflow-x:auto;padding:8px 0}.f-value-label{font-size:14px}.f-help[hidden]{display:none}.f-disabled-card{height:120px;border:1px solid #294154;border-radius:8px;padding:10px;box-sizing:border-box;font-size:12px}.f-main svg{touch-action:pan-y}.f-error{color:#e6b7b7}.f-visual-wrap{min-width:0}.f-controls{margin-top:12px}.f-progress-summary{font-size:14px}.f-history details summary{min-height:44px;cursor:pointer}.f-history code{white-space:pre-wrap;overflow-wrap:anywhere}
@media(max-width:680px){.f-grid.a-available-topics{grid-template-columns:repeat(2,minmax(0,1fr))}.f-main{padding:20px 12px 40px}.f-header nav{width:100%;order:3}.f-header nav a{flex:1}.f-header .a-brand img{max-width:165px}.f-panel{padding:12px}.f-fields{grid-template-columns:minmax(0,1fr)}}
@media(prefers-reduced-motion:reduce){.f-main *{animation:none!important;transition:none!important;scroll-behavior:auto!important}}

@media(max-width:680px){.f-diagram text{font-size:24px}}

.f-video-panel{margin:20px 0;padding:16px;border:1px solid #294154;border-radius:10px;background:#0d1926}.f-video-panel h2{margin-top:0}.f-video-player{display:block;width:100%;height:auto;margin:10px 0;aspect-ratio:16/9;max-width:100%;background:#080d14;border-radius:6px}.f-video-panel .f-muted{font-size:14px}.f-video-panel .f-tools{margin-bottom:0}.f-video-panel [hidden]{display:none}
@media(max-width:680px){.f-video-panel{padding:12px}}

/* UI audit 2026-10-12: ritme vertikal, hierarki aksi, daftar konsep */
.f-main:focus{outline:none}
.f-main>p,.f-lede,.f-section-intro,.f-fineprint{max-width:72ch}
.f-main h1{margin:2px 0 8px}
.f-lede{margin:0 0 4px;font-size:17px;color:#edf5fb}
.f-section{margin-top:40px}
.f-section>h2,.f-gap-top{margin:0 0 4px}
.f-gap-top{margin-top:40px}
.f-section-intro{margin:0 0 16px;font-size:15px}
.f-fineprint{margin:32px 0 0;font-size:13px;line-height:1.55;color:#8fa3b2}
.f-actions{display:flex;flex-wrap:wrap;gap:8px;margin:20px 0 8px}
.f-sublinks{display:flex;flex-wrap:wrap;gap:0 20px;margin:4px 0}
.f-link{display:inline-flex;align-items:center;gap:6px;min-height:44px;color:#a3defa;text-decoration:underline;text-decoration-color:#4a7a95;text-underline-offset:4px}
.f-link:hover{text-decoration-color:#a3defa}
.f-back{min-height:36px;margin:-8px 0 8px;font-size:14px;text-decoration:none}
.f-main .f-button.is-primary,.f-main button:not(.lab *).is-primary{background:#91d4f2;border-color:#91d4f2;color:#08131d;font-weight:600}
.f-main .f-button.is-primary:hover,.f-main button:not(.lab *).is-primary:hover{background:#b6e4f8;border-color:#b6e4f8}
.f-status.is-quiet{border:0;background:none;padding:0;margin:16px 0 20px;font-size:13px;color:#8fa3b2}
.f-status.is-quiet::before{content:"●";color:#8ccea9;font-size:9px;margin-right:8px;vertical-align:2px}
.f-disabled-card{border-style:dashed;background:transparent;color:#8fa3b2}
.f-disabled-card strong{color:#c9d6df}
.f-more .f-actions{margin-top:8px}
.f-concept-list{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}
.f-concept-list li{min-width:0;display:flex}
.f-concept-item{flex:1;display:flex;align-items:center;gap:10px;min-height:48px;padding:8px 12px;border:1px solid #294154;border-radius:8px;background:#0d1926;color:#edf5fb;text-decoration:none;box-sizing:border-box;line-height:1.3}
a.f-concept-item:hover{border-color:#5d8199;background:#142333}
.f-concept-name{min-width:0;overflow-wrap:anywhere}
.f-step{flex:0 0 24px;height:24px;border-radius:50%;display:grid;place-items:center;font-size:12px;font-weight:650;background:#365f78;color:#edf5fb}
.f-concept-item.is-held{border-style:dashed;background:transparent;color:#8fa3b2}
.is-held .f-step{background:transparent;box-shadow:inset 0 0 0 1px #4a6578;color:#8fa3b2}
.f-tag{margin-left:auto;flex:0 0 auto;font-size:11px;letter-spacing:.03em;color:#9fb2c0;border:1px solid #3a5265;border-radius:999px;padding:1px 8px;white-space:nowrap}
@media(max-width:680px){.f-concept-list{grid-template-columns:minmax(0,1fr)}.f-section{margin-top:32px}.f-lede{font-size:16px}}