/* Si Paling Teknik — identitas: biru tua + kuning, tombol tebal, panel bulat. */
:root {
  --bg: #ffffff;
  --tint: #eef3fc;
  --tint-2: #fff5d1;
  --surface: #ffffff;
  --surface-2: #f3f5fa;
  --ink: #0b1b3f;
  --ink-2: #44506b;
  --ink-3: #7b859b;
  --line: #dce2ee;
  --navy: #0b2a6b;
  --navy-deep: #061a47;
  --on-navy: #ffffff;
  --yellow: #ffc629;
  --yellow-deep: #d49b00;
  --on-yellow: #0b1b3f;
  --cut: #e3a700;
  --feed: #1d5bd8;
  --ok: #12805c;
  --ok-soft: #dcf5ea;
  --ok-deep: #0c5e43;
  --bad: #c0362c;
  --bad-soft: #fde8e5;
  --steel: #b6c0cf;
  --steel-2: #dce3ee;
  --tool: #0b2a6b;
  --radius: 16px;
  color-scheme: light;
  --font: "Poppins", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font-family: var(--font); font-size: 16px; line-height: 1.65;
}
img, svg, canvas { max-width: 100%; display: block; }
a { color: inherit; text-underline-offset: 3px; }
h1, h2, h3 { line-height: 1.2; margin: 0; font-weight: 600; letter-spacing: -0.01em; }
h1 { font-size: clamp(2rem, 6.4vw, 3.4rem); }
h2 { font-size: clamp(1.45rem, 4.2vw, 2.25rem); }
h3 { font-size: 1.05rem; }
p { margin: 0; }

.wrap { width: 100%; max-width: 1080px; margin: 0 auto; padding: 0 16px; }
.wrap.narrow { max-width: 860px; }
.center { text-align: center; }

/* Penanda kuning di belakang kata kunci */
.hl {
  background: linear-gradient(transparent 58%, var(--yellow) 58%, var(--yellow) 92%, transparent 92%);
  padding: 0 0.12em;
}

/* Bilah atas */
.top { position: sticky; top: 0; z-index: 20; background: var(--bg); border-bottom: 1px solid var(--line); }
.top .wrap { display: flex; align-items: center; gap: 14px; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.05rem; text-decoration: none; margin-right: auto; }
.brand-mark {
  width: 34px; height: 34px; border-radius: 10px; background: var(--navy); color: var(--yellow);
  display: grid; place-items: center; font-size: 14px; font-weight: 700; box-shadow: 0 3px 0 var(--navy-deep);
}
.nav { display: flex; gap: 22px; font-size: 0.92rem; font-weight: 500; }
.nav a { text-decoration: none; color: var(--ink-2); }
.nav a:hover { color: var(--ink); }
.icon-btn {
  width: 40px; height: 40px; border-radius: 10px; border: 1px solid var(--line);
  background: var(--surface); color: var(--ink); cursor: pointer; font-size: 17px;
}

/* Tombol tebal dengan bayangan bawah */
.btn {
  min-height: 46px; padding: 0 20px; border-radius: 10px; border: 0; cursor: pointer;
  font: inherit; font-weight: 600; font-size: 0.98rem; text-decoration: none;
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  background: var(--surface-2); color: var(--ink); box-shadow: 0 4px 0 var(--line);
  transition: transform 0.08s, box-shadow 0.08s;
}
.btn:active { transform: translateY(3px); box-shadow: 0 1px 0 var(--line); }
.btn.yellow { background: var(--yellow); color: var(--on-yellow); box-shadow: 0 4px 0 var(--yellow-deep); }
.btn.yellow:active { box-shadow: 0 1px 0 var(--yellow-deep); }
.btn.navy { background: var(--navy); color: var(--on-navy); box-shadow: 0 4px 0 var(--navy-deep); }
.btn.navy:active { box-shadow: 0 1px 0 var(--navy-deep); }
.btn.lg { min-height: 56px; padding: 0 34px; font-size: 1.1rem; border-radius: 12px; }
.btn.sm { min-height: 40px; padding: 0 16px; font-size: 0.9rem; }
.btn:focus-visible, .icon-btn:focus-visible, .opt:focus-visible, a:focus-visible, input:focus-visible {
  outline: 3px solid var(--feed); outline-offset: 3px;
}

/* Beranda: hero */
.hero { padding: 48px 0 0; text-align: center; }
.hero .lead { margin: 16px auto 0; max-width: 46ch; font-size: 1.08rem; color: var(--ink-2); }

.stage {
  margin-top: 40px; background: var(--tint); border-radius: 28px 28px 0 0; padding: 32px 16px 0;
  display: grid; gap: 16px; grid-template-columns: 1fr 1.25fr 1fr; align-items: end;
}
.float {
  background: var(--surface); border-radius: 16px; padding: 14px; text-align: left;
  box-shadow: 0 6px 0 color-mix(in srgb, var(--navy) 16%, transparent); margin-bottom: 28px;
}
.float.main { margin-bottom: 0; border-radius: 16px 16px 0 0; padding: 0; overflow: hidden; }
.float h3 { font-size: 0.92rem; }
.float p { font-size: 0.82rem; color: var(--ink-2); }
.badge {
  display: inline-block; font-size: 0.72rem; font-weight: 600; padding: 3px 10px; border-radius: 999px;
  background: var(--tint-2); color: var(--ink); margin-bottom: 8px;
}
.badge.navy { background: var(--navy); color: var(--on-navy); }
.mini-opts { display: grid; gap: 6px; margin-top: 10px; }
.mini-opts span { font-size: 0.8rem; font-weight: 500; padding: 7px 10px; border-radius: 8px; background: var(--surface-2); }
.mini-opts span.ok { background: var(--ok); color: #fff; box-shadow: 0 3px 0 var(--ok-deep); }
.bignum { font-size: 2.2rem; font-weight: 700; line-height: 1; color: var(--navy); }

/* Jendela tiruan untuk gambar dan simulasi */
.win { background: var(--surface); border-radius: 14px; overflow: hidden; border: 2px solid var(--navy); }
.win-bar { background: var(--navy); color: var(--on-navy); display: flex; align-items: center; gap: 6px; padding: 9px 12px; font-size: 0.78rem; font-weight: 500; }
.win-bar i { width: 9px; height: 9px; border-radius: 50%; background: var(--on-navy); opacity: 0.9; }
.win-bar i:first-child { background: var(--yellow); opacity: 1; }
.win-bar span { margin-left: 8px; opacity: 0.85; }
.win-body { padding: 14px; }
.win-body svg { width: 100%; height: auto; }
.float.main .win { border: 0; border-radius: 0; }
figure { margin: 0; }
figcaption { font-size: 0.85rem; color: var(--ink-3); margin-top: 10px; }

/* Baris pil */
.pills { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; padding: 28px 0 0; }
.pill { font-size: 0.85rem; font-weight: 600; padding: 8px 16px; border-radius: 999px; background: var(--surface-2); color: var(--ink-2); }
.pill.on { background: var(--navy); color: var(--on-navy); }

/* Baris fitur berselang-seling */
.band { padding: 64px 0; }
.band.tint { background: var(--tint); }
.feature { display: grid; gap: 36px; grid-template-columns: 1fr 1fr; align-items: center; }
.feature + .feature { margin-top: 72px; }
.feature.flip .feature-art { order: 2; }
.eyebrow { font-size: 0.75rem; font-weight: 600; letter-spacing: 0.1em; color: var(--ink-3); margin-bottom: 8px; }
.feature p.sub { color: var(--ink-2); margin-top: 12px; }
.art { border-radius: 24px; padding: 22px; background: var(--tint); }
.art.yellow { background: var(--tint-2); }
.checks { list-style: none; margin: 18px 0 0; padding: 0; display: grid; gap: 12px; }
.checks li { display: grid; grid-template-columns: 26px 1fr; gap: 10px; font-size: 0.95rem; color: var(--ink-2); }
.checks li::before {
  content: "\2713"; width: 24px; height: 24px; border-radius: 50%; background: var(--yellow); color: var(--on-yellow);
  display: grid; place-items: center; font-size: 13px; font-weight: 700; margin-top: 1px;
}
.callout {
  display: flex; align-items: center; gap: 14px; margin-top: 20px; padding: 14px 18px;
  background: var(--surface-2); border-radius: 14px; font-size: 0.92rem; color: var(--ink-2);
}
.callout b { font-size: 2rem; font-weight: 700; color: var(--navy); line-height: 1; }
.feature .btn { margin-top: 22px; }

.soon { font-size: 0.72rem; font-weight: 600; color: var(--ink-3); background: var(--surface-2); padding: 3px 10px; border-radius: 999px; }

/* Penutup biru tua */
.closer { background: var(--navy); color: var(--on-navy); border-radius: 28px; padding: 48px 20px; text-align: center; margin: 0 16px; }
.closer p { opacity: 0.85; max-width: 44ch; margin: 12px auto 24px; }

footer { padding: 32px 0 44px; font-size: 0.85rem; color: var(--ink-3); text-align: center; }

/* Halaman pelajaran */
.lesson-hero { background: var(--tint); padding: 34px 0 38px; }
.crumb { font-size: 0.82rem; color: var(--ink-3); margin-bottom: 12px; font-weight: 500; }
.lesson-hero .lead { font-size: 1.05rem; color: var(--ink-2); margin-top: 14px; max-width: 58ch; }
.meta { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
.chip { font-size: 0.78rem; font-weight: 600; padding: 5px 12px; border-radius: 999px; background: var(--surface); color: var(--ink-2); }
.chip.y { background: var(--yellow); color: var(--on-yellow); }
.lesson section { padding: 44px 0; }
.lesson section > .wrap > h2 { font-size: clamp(1.3rem, 4vw, 1.75rem); margin-bottom: 12px; }
.step-no {
  display: inline-grid; place-items: center; width: 32px; height: 32px; border-radius: 10px; margin-right: 10px;
  background: var(--yellow); color: var(--on-yellow); font-size: 0.95rem; font-weight: 700; box-shadow: 0 3px 0 var(--yellow-deep);
  vertical-align: 3px;
}
.prose { max-width: 66ch; color: var(--ink-2); }
.prose strong { color: var(--ink); font-weight: 600; }
.prose + .prose { margin-top: 12px; }
.lesson figure { margin-top: 22px; }

/* Kelas untuk gambar 2D */
.d-steel { fill: var(--steel); }
.d-layer { fill: var(--steel-2); }
.d-tool { fill: var(--tool); }
.d-chip { fill: none; stroke: var(--yellow); stroke-linecap: round; }
.d-chip-edge { fill: none; stroke: var(--yellow-deep); stroke-linecap: round; }
.d-cut { fill: none; stroke: var(--cut); stroke-width: 3.5; stroke-linecap: round; }
.d-feed { fill: none; stroke: var(--feed); stroke-width: 3.5; stroke-linecap: round; }
.d-dash { fill: none; stroke: var(--ink-3); stroke-width: 1.5; stroke-dasharray: 6 5; }
.d-thin { fill: none; stroke: var(--ink-3); stroke-width: 1.5; }
.d-hole { fill: var(--surface-2); }
.d-txt { fill: var(--ink); font-family: var(--font); font-size: 15px; font-weight: 600; }
.d-txt-on { fill: var(--bg); font-family: var(--font); font-size: 15px; font-weight: 600; }
.m-cut { fill: var(--cut); }
.m-feed { fill: var(--feed); }

.legend { display: flex; flex-wrap: wrap; gap: 18px; font-size: 0.88rem; color: var(--ink-2); margin-top: 16px; font-weight: 500; }
.dot { display: inline-block; width: 12px; height: 12px; border-radius: 4px; margin-right: 7px; vertical-align: -1px; }
.dot.cut { background: var(--cut); }
.dot.feed { background: var(--feed); }

.moves { display: grid; gap: 12px; margin-top: 20px; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.move { background: var(--surface-2); border-radius: 14px; padding: 14px 16px; border-top: 5px solid var(--ink-3); }
.move.cut { border-color: var(--cut); }
.move.feed { border-color: var(--feed); }
.move p { font-size: 0.9rem; color: var(--ink-2); margin-top: 4px; }

.three { display: grid; gap: 14px; margin-top: 22px; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); }
.card { background: var(--surface); border: 2px solid var(--line); border-radius: var(--radius); padding: 14px; display: flex; flex-direction: column; gap: 8px; }
.card svg { width: 100%; height: auto; background: var(--surface-2); border-radius: 10px; }
.card p { font-size: 0.9rem; color: var(--ink-2); }
.card dl { margin: 2px 0 0; display: grid; gap: 4px; font-size: 0.86rem; }
.card dl div { display: flex; gap: 6px; align-items: baseline; }
.card dt { flex: none; font-weight: 600; }
.card dd { margin: 0; color: var(--ink-2); }

/* Simulasi 3D */
.sim-stage { position: relative; aspect-ratio: 16 / 10; background: var(--tint); touch-action: pan-y; }
.sim-stage canvas { width: 100%; height: 100%; }
.sim-hint { position: absolute; left: 12px; bottom: 10px; font-size: 0.76rem; color: var(--ink-3); pointer-events: none; font-weight: 500; }
.sim-status {
  position: absolute; right: 12px; top: 10px; font-size: 0.78rem; font-weight: 600;
  padding: 4px 12px; border-radius: 999px; background: var(--surface); color: var(--ink-2);
}
.sim-status.run { background: var(--yellow); color: var(--on-yellow); }
.sim-status.done { background: var(--ok); color: #fff; }
.sim-fallback { position: absolute; inset: 0; display: grid; place-items: center; padding: 20px; text-align: center; color: var(--ink-2); font-size: 0.95rem; }
.sim-body { padding: 18px 16px; display: grid; gap: 18px; }
.ctrl { display: grid; gap: 14px; }
.ctrl label { display: grid; grid-template-columns: 1fr auto; gap: 2px 12px; font-size: 0.9rem; font-weight: 600; }
.ctrl output { font-variant-numeric: tabular-nums; color: var(--feed); }
.ctrl input[type="range"] { grid-column: 1 / -1; width: 100%; height: 30px; accent-color: var(--navy); }
.readout { display: grid; gap: 10px; grid-template-columns: repeat(3, minmax(0, 1fr)); }
.stat { background: var(--surface-2); border-radius: 12px; padding: 10px 12px; }
.stat span { display: block; font-size: 0.74rem; color: var(--ink-3); line-height: 1.3; font-weight: 500; }
.stat b { font-size: 1.2rem; font-weight: 700; font-variant-numeric: tabular-nums; }
.stat small { font-size: 0.74rem; color: var(--ink-3); font-weight: 600; }
.sim-note { font-size: 0.88rem; color: var(--ink-2); background: var(--tint-2); border-radius: 12px; padding: 10px 14px; }
.btns { display: flex; gap: 12px; flex-wrap: wrap; }

.formula { margin-top: 18px; background: var(--navy); color: var(--on-navy); border-radius: var(--radius); padding: 18px; overflow-x: auto; }
.formula code { font-family: ui-monospace, "Cascadia Code", Consolas, monospace; font-size: 1.1rem; font-weight: 700; white-space: nowrap; color: var(--yellow); }
.formula ul { margin: 10px 0 0; padding-left: 18px; font-size: 0.88rem; opacity: 0.9; }

/* Kuis dengan ubin jawaban tebal */
.quiz { display: grid; gap: 18px; margin-top: 20px; }
.q { background: var(--tint); border-radius: var(--radius); padding: 18px 16px; }
.q h3 { margin-bottom: 14px; font-weight: 600; line-height: 1.4; }
.opts { display: grid; gap: 10px; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); }
.opt {
  text-align: left; min-height: 52px; padding: 10px 14px; border-radius: 12px; border: 0;
  background: var(--surface); color: var(--ink); font: inherit; font-weight: 500; font-size: 0.95rem; cursor: pointer;
  box-shadow: 0 4px 0 var(--line); transition: transform 0.08s, box-shadow 0.08s;
}
.opt:active { transform: translateY(3px); box-shadow: 0 1px 0 var(--line); }
.opt.right { background: var(--ok); color: #fff; box-shadow: 0 4px 0 var(--ok-deep); font-weight: 600; }
.opt.wrong { background: var(--bad-soft); color: var(--bad); box-shadow: 0 4px 0 color-mix(in srgb, var(--bad) 35%, transparent); }
.fb { margin-top: 12px; font-size: 0.9rem; color: var(--ink-2); min-height: 1.4em; }
.score { font-weight: 600; margin-top: 16px; }

@media (max-width: 820px) {
  .nav { display: none; }
  .feature { grid-template-columns: 1fr; gap: 22px; }
  .feature.flip .feature-art { order: 0; }
  .feature + .feature { margin-top: 52px; }
  .stage { grid-template-columns: 1fr 1fr; padding: 22px 12px 0; }
  .stage .float.main { grid-column: 1 / -1; order: 3; }
  .stage .float { margin-bottom: 0; }
  .band { padding: 48px 0; }
}
@media (max-width: 560px) {
  .sim-stage { aspect-ratio: 4 / 3; }
  .readout { grid-template-columns: 1fr 1fr; }
  .readout .stat:last-child { grid-column: 1 / -1; }
  .closer { margin: 0 12px; padding: 36px 16px; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } .btn, .opt { transition: none; } }

/* ---------- Lab simulasi 2D dan maskot Angka ---------- */
.lab-stage { aspect-ratio: auto; padding: 34px 10px 6px; touch-action: auto; }
.lab-stage svg { display: block; width: 100%; height: auto; }
.lab-stage text { font-family: inherit; }
.l-txt { font-size: 15px; font-weight: 600; fill: var(--ink-2); }
.l-kecil { font-size: 13px; font-weight: 500; fill: var(--ink-2); }
.l-mini { font-size: 11px; font-weight: 500; fill: var(--ink-2); }
.l-hint { font-size: 13px; font-weight: 600; fill: #8a5a00; }
.l-nilai { font-size: 17px; font-weight: 700; fill: var(--ink); }
.l-besar { font-size: 34px; font-weight: 700; fill: var(--ink); font-variant-numeric: tabular-nums; }
.tekan-svg { cursor: pointer; }
.cincin { transform-box: fill-box; transform-origin: center; animation: cincin 1.4s ease-out infinite; pointer-events: none; }
@keyframes cincin { from { transform: scale(0.7); opacity: 0.9; } to { transform: scale(1.35); opacity: 0; } }
.alir { animation: alir 0.9s linear infinite; }
@keyframes alir { to { stroke-dashoffset: -16; } }
.arus { animation: arus 1s linear infinite; }
@keyframes arus { to { stroke-dashoffset: -22; } }
.readout.r4 { grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); }
#lab-tahan { touch-action: none; user-select: none; -webkit-user-select: none; }
#lab-tahan[aria-pressed="true"] { transform: translateY(3px); box-shadow: 0 1px 0 var(--yellow-deep); }
.lab-pandu { display: flex; align-items: flex-end; gap: 14px; }
.lab-angka { flex: 0 0 112px; }
.lab-ucap { position: relative; flex: 1; min-width: 0; align-self: center; background: var(--navy); color: var(--on-navy); border-radius: 14px; padding: 12px 16px; font-size: 0.95rem; font-weight: 500; min-height: 3.2em; }
.lab-ucap::before { content: ""; position: absolute; left: -7px; top: 50%; width: 16px; height: 16px; margin-top: -8px; background: inherit; transform: rotate(45deg); border-radius: 3px; }
.lab-misi { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.lab-misi li { display: flex; align-items: center; gap: 10px; font-size: 0.9rem; color: var(--ink-3); font-weight: 500; }
.lab-misi li[data-st="ok"] { color: var(--ink); }
.lab-misi li[data-st="aktif"] { color: var(--ink); font-weight: 600; }
.lab-misi .no { flex: 0 0 auto; width: 26px; height: 26px; border-radius: 50%; display: grid; place-items: center; border: 2px solid var(--line); font-size: 0.78rem; font-weight: 700; }
.lab-misi li[data-st="ok"] .no { background: var(--ok); border-color: var(--ok); color: #fff; }
.lab-misi li[data-st="aktif"] .no { background: var(--yellow); border-color: var(--yellow-deep); color: var(--on-yellow); }
.angka { display: block; width: 100%; height: auto; overflow: visible; }
.angka .lengan { transform-box: fill-box; transform-origin: 50% 10.7%; transition: transform 0.4s cubic-bezier(0.3, 1.4, 0.5, 1); }
.angka .lengan.dekat { transform: rotate(12deg); }
.angka .lengan.jauh { transform: rotate(-12deg); }
.angka[data-pose="tunjuk"] .lengan.jauh { transform: rotate(-96deg); }
.angka[data-pose="lambai"] .lengan.jauh { animation: a-lambai 0.45s ease-in-out infinite alternate; }
.angka[data-pose="sorak"] .lengan.dekat { animation: a-sorak-d 0.3s ease-in-out infinite alternate; }
.angka[data-pose="sorak"] .lengan.jauh { animation: a-sorak-j 0.3s ease-in-out infinite alternate; }
@keyframes a-lambai { from { transform: rotate(-132deg); } to { transform: rotate(-168deg); } }
@keyframes a-sorak-d { from { transform: rotate(142deg); } to { transform: rotate(160deg); } }
@keyframes a-sorak-j { from { transform: rotate(-142deg); } to { transform: rotate(-160deg); } }
.angka .w-biasa, .angka .w-senang, .angka .w-kaget { display: none; }
.angka[data-wajah="biasa"] .w-biasa, .angka[data-wajah="senang"] .w-senang, .angka[data-wajah="kaget"] .w-kaget { display: inline; }
.angka .mata { transform-box: fill-box; transform-origin: center; animation: a-kedip 4.2s infinite; }
@keyframes a-kedip { 0%, 93%, 100% { transform: scaleY(1); } 96% { transform: scaleY(0.12); } }
.kenal-angka { display: flex; flex-wrap: wrap; align-items: center; gap: 18px; }
.kenal-angka .lab-angka { flex: 0 0 120px; }
.kenal-angka > div:last-child { flex: 1 1 240px; min-width: 0; }
@media (prefers-reduced-motion: reduce) {
  .cincin, .alir, .arus, .angka .lengan, .angka .mata { animation: none !important; transition: none; }
  .angka[data-pose="lambai"] .lengan.jauh, .angka[data-pose="sorak"] .lengan.jauh { transform: rotate(-150deg); }
  .angka[data-pose="sorak"] .lengan.dekat { transform: rotate(150deg); }
}