:root {
  --bg: #f4f7f9;
  --bg-panel: #ffffff;
  --bg-kartu: #ffffff;
  --teks: #142433;
  --teks-redup: #4c6070;
  --garis: #d6e0e6;
  --aksen: #1c7ea6;
  --aksen-redup: #e5f1f6;
  --bahaya: #c9432f;

  --fase-gas-panas: #e0552f;
  --fase-cair: #f0a531;
  --fase-campuran: #6fc3e0;
  --fase-uap-dingin: #2f6fa8;
  --logam: #8fa3ad;
  --logam-gelap: #5d7079;

  color-scheme: light;
}

:root[data-tema="gelap"] {
  --bg: #0f1a22;
  --bg-panel: #16232c;
  --bg-kartu: #1b2b35;
  --teks: #e7eef2;
  --teks-redup: #9db0bb;
  --garis: #2a3c47;
  --aksen: #4bb3dc;
  --aksen-redup: #17313c;
  --bahaya: #e2695a;

  --logam: #5d7079;
  --logam-gelap: #3a4a52;

  color-scheme: dark;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--teks);
  line-height: 1.55;
}

h1, h2, h3 { line-height: 1.25; }

.topbar {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 10px 20px;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--garis);
  position: sticky;
  top: 0;
  z-index: 10;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 1.1rem;
  margin-right: auto;
}
.brand-ikon { color: var(--aksen); font-size: 1.3rem; }

.tab-nav { display: flex; gap: 6px; flex-wrap: wrap; }

.tab-btn {
  border: 1px solid var(--garis);
  background: transparent;
  color: var(--teks-redup);
  padding: 8px 14px;
  border-radius: 999px;
  cursor: pointer;
  font-size: 0.92rem;
  font-weight: 600;
}
.tab-btn.is-aktif {
  background: var(--aksen);
  border-color: var(--aksen);
  color: #fff;
}

.tema-toggle {
  border: 1px solid var(--garis);
  background: var(--bg-kartu);
  color: var(--teks);
  border-radius: 50%;
  width: 36px;
  height: 36px;
  cursor: pointer;
  font-size: 1rem;
}

main { max-width: 1080px; margin: 0 auto; padding: 24px 20px 60px; }

.is-tersembunyi { display: none; }

.modul-intro h1 { margin: 0 0 8px; font-size: 1.6rem; }
.modul-intro p { color: var(--teks-redup); max-width: 68ch; }

.panel-siklus, .panel-ph, .panel-materi {
  background: var(--bg-panel);
  border: 1px solid var(--garis);
  border-radius: 14px;
  padding: 20px;
  margin-top: 20px;
}

.siklus-svg-bungkus { width: 100%; overflow-x: auto; }
#svgSiklus, #svgPh { width: 100%; height: auto; display: block; }

.siklus-kontrol {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 14px;
}

.tombol {
  border: 1px solid var(--garis);
  background: var(--bg-kartu);
  color: var(--teks);
  padding: 9px 16px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.92rem;
  font-weight: 600;
}
.tombol:hover { border-color: var(--aksen); }
.tombol-aksen { background: var(--aksen); border-color: var(--aksen); color: #fff; }
.tombol-kecil { padding: 6px 12px; font-size: 0.82rem; }
.tombol-stop { color: var(--bahaya); border-color: var(--bahaya); }

.legenda-fase {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  font-size: 0.82rem;
  color: var(--teks-redup);
}
.legenda-item { display: flex; align-items: center; gap: 6px; }
.swatch { width: 12px; height: 12px; border-radius: 3px; display: inline-block; }
.swatch-gas-panas { background: var(--fase-gas-panas); }
.swatch-cair { background: var(--fase-cair); }
.swatch-campuran { background: var(--fase-campuran); }
.swatch-uap-dingin { background: var(--fase-uap-dingin); }

.grid-skema {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 18px;
  margin-top: 20px;
}

.kartu-skema {
  background: var(--bg-kartu);
  border: 1px solid var(--garis);
  border-radius: 14px;
  padding: 16px;
}
.kartu-skema h3 { margin: 0 0 6px; font-size: 1.02rem; }
.kartu-skema p { margin: 0 0 10px; color: var(--teks-redup); font-size: 0.88rem; }
.svg-skema { width: 100%; height: auto; display: block; background: var(--aksen-redup); border-radius: 8px; }

.skema-aksi { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 10px; }

.accordion { display: flex; flex-direction: column; gap: 8px; }
.accordion-item {
  border: 1px solid var(--garis);
  border-radius: 10px;
  overflow: hidden;
}
.accordion-head {
  width: 100%;
  text-align: left;
  background: var(--bg-kartu);
  border: none;
  color: var(--teks);
  padding: 12px 16px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.95rem;
}
.accordion-head::after { content: "+"; color: var(--aksen); font-size: 1.2rem; }
.accordion-item.is-buka .accordion-head::after { content: "\2212"; }
.accordion-body {
  padding: 0 16px;
  max-height: 0;
  overflow: hidden;
  color: var(--teks-redup);
  font-size: 0.92rem;
  transition: max-height 0.25s ease, padding 0.25s ease;
}
.accordion-item.is-buka .accordion-body {
  padding: 0 16px 16px;
  max-height: 600px;
}
.accordion-body p { margin: 0 0 10px; }
.accordion-body ul { margin: 0 0 10px; padding-left: 20px; }
.accordion-body table { border-collapse: collapse; width: 100%; margin: 10px 0; font-size: 0.88rem; }
.accordion-body th, .accordion-body td { border: 1px solid var(--garis); padding: 6px 10px; text-align: left; }

.footer {
  text-align: center;
  color: var(--teks-redup);
  font-size: 0.82rem;
  padding: 20px;
}

/* --- elemen SVG bersama --- */
.lbl { font-size: 13px; fill: var(--teks); font-family: inherit; }
.lbl-kecil { font-size: 11px; fill: var(--teks-redup); font-family: inherit; }
.pipa { fill: none; stroke-width: 8; stroke-linecap: round; stroke-linejoin: round; }
.komponen-kotak { fill: var(--bg-kartu); stroke: var(--logam-gelap); stroke-width: 2; }
.titik-alir { r: 5; }

.kabel { fill: none; stroke: var(--logam-gelap); stroke-width: 2.5; }
.kabel-hidup { stroke: var(--fase-gas-panas); }
.kontak-terbuka, .kontak-tertutup { stroke: var(--logam-gelap); stroke-width: 2.5; }
.kontak-tertutup { stroke: var(--aksen); }
.node { fill: var(--logam-gelap); }

/* --- siklus refrigerasi: warna pipa = fase, titik bergerak = arah aliran --- */
.pipa-gas-panas { stroke: var(--fase-gas-panas); }
.pipa-cair { stroke: var(--fase-cair); }
.pipa-campuran { stroke: var(--fase-campuran); }
.pipa-uap-dingin { stroke: var(--fase-uap-dingin); }

.titik-alir {
  fill: #fff;
  stroke: rgba(0,0,0,0.3);
  stroke-width: 1;
  animation: alirTitik linear infinite;
}
@keyframes alirTitik {
  from { offset-distance: 0%; }
  to { offset-distance: 100%; }
}

.komponen-fan { transform-box: fill-box; transform-origin: center; animation: putarFan 1.4s linear infinite; }
@keyframes putarFan { to { transform: rotate(360deg); } }

.kotak-ambien { fill: none; stroke: var(--garis); stroke-width: 1.5; stroke-dasharray: 5 4; }

.heater-defrost { fill: var(--bahaya); opacity: 0; transition: opacity 0.4s ease; }
.svg-siklus.is-defrost .heater-defrost { opacity: 1; }
.svg-siklus.is-defrost .titik-alir { animation-play-state: paused; opacity: 0.2; transition: opacity 0.4s; }
.svg-siklus.is-defrost .komponen-fan { animation-play-state: paused; }
.svg-siklus .titik-alir, .svg-siklus .komponen-fan { transition: opacity 0.4s; }
.svg-siklus .komponen-kompresor { transition: opacity 0.4s; }
.svg-siklus.is-defrost .komponen-kompresor { opacity: 0.4; }

/* --- Modul C: efek visual gangguan, mesin yang sama dengan Modul A --- */
.komponen-fan.is-mati { animation-play-state: paused; opacity: 0.3; }
.komponen-kompresor.is-mati { opacity: 0.35; }
.komponen-kompresor.is-short-cycle { animation: kedipKompresor 1.1s steps(2, jump-none) infinite; }
@keyframes kedipKompresor { 50% { opacity: 0.3; } }

.grup-titik.alir-lambat .titik-alir { animation-duration: 5.5s !important; opacity: 0.6; }
.grup-titik.alir-cepat .titik-alir { animation-duration: 0.8s !important; }
.grup-titik.alir-henti .titik-alir { animation-play-state: paused; opacity: 0.25; }

.efek-kondensor-kotor { fill: #3a2a18; opacity: 0; transition: opacity 0.4s ease; pointer-events: none; }
.efek-kondensor-kotor.is-aktif { opacity: 0.4; }

.efek-cairan-menumpuk { fill: var(--fase-cair); opacity: 0; transition: opacity 0.4s ease; }
.efek-cairan-menumpuk.is-aktif { opacity: 0.55; }

.efek-es-sebagian, .efek-es-penuh { opacity: 0; transition: opacity 0.4s ease; }
.efek-es-sebagian.is-aktif { opacity: 0.95; }
.efek-es-penuh.is-aktif { opacity: 1; }

/* --- panel gauge & kuis diagnosa --- */
.panel-gauge {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
  margin-top: 16px;
}
.gauge {
  background: var(--bg-kartu);
  border: 1px solid var(--garis);
  border-radius: 10px;
  padding: 10px 14px;
}
.gauge-label { font-size: 0.78rem; color: var(--teks-redup); margin-bottom: 4px; }
.gauge-nilai { font-size: 1.15rem; font-weight: 700; }
.gauge-bar { height: 6px; border-radius: 3px; background: var(--garis); margin-top: 8px; overflow: hidden; }
.gauge-bar-isi { height: 100%; border-radius: 3px; transition: width 0.3s ease, background 0.3s ease; }
.gauge-bar-isi.zona-rendah { background: var(--fase-uap-dingin); }
.gauge-bar-isi.zona-normal { background: var(--aksen); }
.gauge-bar-isi.zona-tinggi { background: var(--bahaya); }

.layar-kontroler {
  font-family: "Consolas", "Courier New", monospace;
  background: #0b1a12;
  color: #7CFFB2;
  border-radius: 8px;
  padding: 10px 14px;
  margin-top: 14px;
  font-size: 0.92rem;
  white-space: pre-wrap;
  min-height: 1.4em;
}
.layar-kontroler.ada-alarm { color: #ff9d7c; }

.mode-toggle { display: flex; gap: 6px; margin: 4px 0 14px; flex-wrap: wrap; }
.mode-btn, .submode-btn {
  border: 1px solid var(--garis);
  background: var(--bg-kartu);
  color: var(--teks-redup);
  padding: 7px 14px;
  border-radius: 999px;
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 600;
}
.mode-btn.is-aktif, .submode-btn.is-aktif { background: var(--aksen); border-color: var(--aksen); color: #fff; }

.pemilih-gangguan { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.gangguan-btn {
  border: 1px solid var(--garis);
  background: var(--bg-kartu);
  color: var(--teks);
  padding: 8px 14px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.85rem;
  text-align: left;
}
.gangguan-btn.is-aktif { border-color: var(--aksen); background: var(--aksen-redup); font-weight: 600; }

.penjelasan-gangguan {
  margin-top: 14px;
  padding: 14px 16px;
  background: var(--aksen-redup);
  border-radius: 10px;
  font-size: 0.92rem;
  border-left: 4px solid var(--aksen);
}

.kuis-box { margin-top: 16px; }
.kuis-pilihan { display: flex; flex-direction: column; gap: 6px; margin: 10px 0; }
.kuis-opsi {
  display: flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--garis);
  border-radius: 8px;
  padding: 8px 12px;
  cursor: pointer;
  font-size: 0.88rem;
}
.kuis-opsi:hover { border-color: var(--aksen); }
.kuis-opsi.terpilih { border-color: var(--aksen); background: var(--aksen-redup); }
.kuis-opsi.jawaban-benar { border-color: #2f9e5f; background: rgba(47,158,95,0.12); }
.kuis-opsi.jawaban-salah { border-color: var(--bahaya); background: rgba(201,67,47,0.12); }
.kuis-umpan {
  margin-top: 10px;
  padding: 12px 14px;
  border-radius: 10px;
  font-size: 0.9rem;
}
.kuis-umpan.benar { background: rgba(47,158,95,0.12); border-left: 4px solid #2f9e5f; }
.kuis-umpan.salah { background: rgba(201,67,47,0.12); border-left: 4px solid var(--bahaya); }
.skor-kuis { font-size: 0.82rem; color: var(--teks-redup); margin-top: 8px; }

/* --- skematik kelistrikan kontrol (Modul B) --- */
.kontak-terbuka { stroke-dasharray: none; }
.kontak-tertutup.dot { stroke: var(--aksen); }
.lampu {
  fill: var(--logam);
  stroke: var(--logam-gelap);
  stroke-width: 1.5;
  transition: fill 0.3s ease;
}
.lampu.is-nyala { fill: var(--fase-cair); }
.lampu.is-nyala.merah { fill: var(--bahaya); }
.kontaktor-batang {
  stroke: var(--logam-gelap);
  stroke-width: 3;
  transition: transform 0.3s ease;
  transform-box: fill-box;
  transform-origin: left center;
}
.kontaktor-batang.is-tutup { transform: rotate(0deg); stroke: var(--aksen); }
.kontaktor-batang.is-buka { transform: rotate(-22deg); }
.motor-putar {
  transition: opacity 0.3s ease;
  animation: putarFan 0.9s linear infinite;
  opacity: 0;
  transform-box: fill-box;
  transform-origin: center;
}
.motor-putar.is-jalan { opacity: 1; }

.jembatan-kontak { stroke: var(--logam-gelap); stroke-width: 3; opacity: 0; transition: opacity 0.25s ease, stroke 0.25s ease; }
.jembatan-kontak.is-tutup { opacity: 1; stroke: var(--aksen); }
.jembatan-kontak.is-trip { opacity: 1; stroke: var(--bahaya); }
.node-kontak { r: 3; fill: var(--logam-gelap); }

.koil { fill: var(--bg-kartu); stroke: var(--logam-gelap); stroke-width: 2; transition: fill 0.3s ease; }
.koil.is-energi { fill: var(--aksen); stroke: var(--aksen); }

.status-teks { font-size: 13px; font-weight: 700; fill: var(--teks); text-anchor: middle; }
.status-teks.status-trip { fill: var(--bahaya); }
.status-teks.status-jalan { fill: var(--aksen); }

.heater-kecil { opacity: 0.15; transition: opacity 0.3s ease; }
.heater-kecil.is-nyala { opacity: 1; }

/* --- Modul D: checklist PTI & log suhu --- */
.teks-status-ok { color: var(--aksen); font-weight: 700; }
.teks-status-perhatian { color: var(--bahaya); font-weight: 700; }
.teks-redup-kecil { color: var(--teks-redup); font-size: 0.85rem; }

.form-pti-header {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
  margin-bottom: 18px;
}
.form-pti-header label, .form-suhu label {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 0.82rem;
  color: var(--teks-redup);
  font-weight: 600;
}
.form-pti-header input, .form-suhu input {
  border: 1px solid var(--garis);
  background: var(--bg-kartu);
  color: var(--teks);
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 0.92rem;
  font-family: inherit;
}

.pti-kategori {
  margin: 18px 0 8px;
  font-size: 0.95rem;
  color: var(--aksen);
  border-bottom: 1px solid var(--garis);
  padding-bottom: 6px;
}
.pti-baris {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 6px 12px;
  align-items: center;
  padding: 8px 0;
  border-bottom: 1px solid var(--garis);
}
.pti-teks { font-size: 0.92rem; grid-column: 1; }
.pti-toggle { display: flex; gap: 6px; grid-column: 2; }
.pti-ok, .pti-tidak {
  border: 1px solid var(--garis);
  background: var(--bg-kartu);
  color: var(--teks-redup);
  padding: 5px 12px;
  border-radius: 999px;
  cursor: pointer;
  font-size: 0.8rem;
  font-weight: 600;
}
.pti-ok.is-aktif { background: var(--aksen); border-color: var(--aksen); color: #fff; }
.pti-tidak.is-aktif { background: var(--bahaya); border-color: var(--bahaya); color: #fff; }
.pti-catatan {
  grid-column: 1 / -1;
  border: 1px solid var(--garis);
  background: var(--bg-kartu);
  color: var(--teks);
  border-radius: 8px;
  padding: 6px 10px;
  font-size: 0.85rem;
  font-family: inherit;
}

.ringkasan-pti {
  margin-top: 16px;
  padding: 12px 16px;
  background: var(--aksen-redup);
  border-radius: 10px;
  font-size: 0.95rem;
}
.pesan-form { font-size: 0.85rem; margin-top: 8px; min-height: 1.2em; }
.pesan-form-error { color: var(--bahaya); }
.pesan-form-ok { color: var(--aksen); }

.riwayat-pti-item {
  border: 1px solid var(--garis);
  border-radius: 10px;
  padding: 12px 14px;
  margin-top: 10px;
  background: var(--bg-kartu);
}
.riwayat-pti-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  font-size: 0.9rem;
}
.riwayat-pti-aksi { display: flex; gap: 8px; margin-top: 10px; }
.riwayat-pti-detail { margin-top: 12px; font-size: 0.85rem; }
.riwayat-pti-detail h4 { margin: 10px 0 4px; color: var(--aksen); font-size: 0.85rem; }
.riwayat-item-baris { padding: 3px 0; color: var(--teks-redup); }

.form-suhu {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: end;
  margin-bottom: 16px;
}
.tabel-bungkus { overflow-x: auto; max-width: 100%; }
.tabel-suhu { border-collapse: collapse; width: 100%; font-size: 0.88rem; min-width: 480px; }
.tabel-suhu th, .tabel-suhu td { border: 1px solid var(--garis); padding: 8px 10px; text-align: left; white-space: nowrap; }
.tabel-suhu th { background: var(--aksen-redup); }

/* --- Modul E: referensi cepat --- */
.input-cari {
  width: 100%;
  border: 1px solid var(--garis);
  background: var(--bg-kartu);
  color: var(--teks);
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 0.92rem;
  font-family: inherit;
  margin-bottom: 14px;
  box-sizing: border-box;
}
.daftar-istilah { display: flex; flex-direction: column; gap: 4px; }
.istilah-item { padding: 10px 0; border-bottom: 1px solid var(--garis); }
.istilah-kata { font-weight: 700; font-size: 0.92rem; margin-bottom: 2px; }
.istilah-arti { font-size: 0.88rem; color: var(--teks-redup); }

.tabel-referensi { border-collapse: collapse; width: 100%; font-size: 0.88rem; min-width: 520px; }
.tabel-referensi th, .tabel-referensi td { border: 1px solid var(--garis); padding: 8px 10px; text-align: left; }
.tabel-referensi th { background: var(--aksen-redup); white-space: nowrap; }

/* --- gerbang bayar & masa coba --- */
.pita:not(.is-tersembunyi) {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
  background: var(--aksen-redup);
  color: var(--teks);
  padding: 10px 16px;
  font-size: 0.88rem;
  border-bottom: 1px solid var(--garis);
}

.gerbang {
  max-width: 640px;
  margin: 24px auto 60px;
  padding: 0 20px;
}
.gerbang-kepala {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
}
.gerbang-kepala h1 { font-size: 1.4rem; margin: 0; }
.gerbang-ringkas { color: var(--teks-redup); margin-bottom: 20px; }

.kartu-harga {
  background: var(--bg-panel);
  border: 1px solid var(--garis);
  border-radius: 14px;
  padding: 20px 24px;
  margin-bottom: 16px;
  text-align: center;
}
.kartu-harga h2 { margin: 0 0 6px; font-size: 1.1rem; }
.harga-angka { font-size: 2.2rem; font-weight: 800; color: var(--aksen); margin: 4px 0; }
.harga-isi { text-align: left; margin: 14px 0 0; padding-left: 20px; color: var(--teks-redup); font-size: 0.9rem; }
.harga-isi li { margin-bottom: 4px; }

.gerbang-siapa, .gerbang-bayar { font-size: 0.92rem; color: var(--teks-redup); }

.gerbang-qris {
  margin: 16px 0;
  text-align: center;
}
.gerbang-qris img { max-width: 260px; width: 100%; height: auto; border-radius: 10px; border: 1px solid var(--garis); }
.gerbang-qris figcaption { font-size: 0.8rem; color: var(--teks-redup); margin-top: 8px; }

.klaim {
  background: var(--bg-panel);
  border: 1px solid var(--garis);
  border-radius: 12px;
  padding: 14px 18px;
  margin: 16px 0;
}
.klaim-judul { cursor: pointer; font-weight: 700; }
.form-klaim { display: flex; flex-direction: column; gap: 12px; margin: 14px 0; }
.form-klaim label, .form-kode label {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 0.82rem;
  color: var(--teks-redup);
  font-weight: 600;
}
.form-klaim input, .form-kode input {
  border: 1px solid var(--garis);
  background: var(--bg-kartu);
  color: var(--teks);
  border-radius: 8px;
  padding: 9px 12px;
  font-size: 0.95rem;
  font-family: inherit;
}
.klaim-tunggu { margin-top: 14px; text-align: center; }
.klaim-nomor { font-size: 1.3rem; font-weight: 800; letter-spacing: 0.08em; color: var(--aksen); }

.form-kode { margin: 20px 0 4px; }
.form-kode .skema-aksi { align-items: stretch; }
.form-kode input { flex: 1; min-width: 0; }