:root {
    --bg: #F2F6F7;        /* udara dingin */
    --ice: #D9E8EE;       /* embun / frost */
    --ink: #0F2230;       /* teks utama */
    --muted: #4A6270;     /* teks sekunder */
    --deep: #0B4A6F;      /* biru freon */
    --copper: #A4561F;    /* pipa tembaga – aksen CTA */
    --copper-dark: #84441A;
    --white: #FFFFFF;
    --lcd: #0A1A22;
    --lcd-glow: #7FE3F0;
    --line: #C3D6DE;
    --radius-lg: 22px;
    --radius-sm: 8px;
    --wrap: 1120px;
  }

  * { box-sizing: border-box; }
  html { scroll-behavior: smooth; }
  body {
    margin: 0;
    background: var(--bg);
    color: var(--ink);
    font-family: "Archivo", system-ui, sans-serif;
    font-size: 17px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
  }
  img { max-width: 100%; display: block; }
  a { color: var(--deep); }
  a:focus-visible, button:focus-visible, summary:focus-visible {
    outline: 3px solid var(--copper);
    outline-offset: 3px;
    border-radius: 4px;
  }
  .wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 20px; }

  h1, h2, h3 { font-stretch: 112%; line-height: 1.12; margin: 0; letter-spacing: -0.01em; }
  h1 { font-size: clamp(2.1rem, 4.6vw, 3.4rem); font-weight: 800; }
  h2 { font-size: clamp(1.6rem, 3vw, 2.3rem); font-weight: 750; }
  h3 { font-size: 1.18rem; font-weight: 700; font-stretch: 105%; }
  p { margin: 0; }
  .lead { font-size: 1.12rem; color: var(--muted); max-width: 58ch; }

  /* ---------- Tombol ---------- */
  .btn {
    display: inline-flex; align-items: center; gap: 10px;
    padding: 14px 22px; border-radius: 999px;
    font: inherit; font-weight: 700; text-decoration: none;
    border: 2px solid transparent; cursor: pointer;
  }
  .btn-primary { background: var(--copper); color: var(--white); }
  .btn-primary:hover { background: var(--copper-dark); }
  .btn-ghost { border-color: var(--deep); color: var(--deep); background: transparent; }
  .btn-ghost:hover { background: var(--ice); }
  .btn svg { width: 20px; height: 20px; }

  /* ---------- Header ---------- */
  header.site {
    position: sticky; top: 0; z-index: 10;
    background: rgba(242, 246, 247, 0.92);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--line);
  }
  .nav { display: flex; align-items: center; justify-content: space-between; height: 68px; gap: 16px; }
  .brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); }
  .brand img { width: 36px; height: 36px; border-radius: 9px; }
  .brand span { font-weight: 800; font-stretch: 125%; font-size: 1.25rem; letter-spacing: 0.02em; }
  .nav ul { display: flex; gap: 26px; list-style: none; margin: 0; padding: 0; }
  .nav ul a { color: var(--ink); text-decoration: none; font-weight: 500; }
  .nav ul a:hover { color: var(--deep); text-decoration: underline; text-underline-offset: 4px; }
  .nav .btn { padding: 10px 18px; font-size: 0.95rem; }
  @media (max-width: 860px) { .nav ul { display: none; } }

  /* ---------- Hero ---------- */
  .hero { padding: 64px 0 72px; }
  .hero-grid { display: grid; grid-template-columns: 1.05fr 1fr; gap: 56px; align-items: center; }
  .hero h1 { margin-bottom: 20px; }
  .hero .lead { margin-bottom: 30px; }
  .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 26px; }
  .hero-note { font-size: 0.95rem; color: var(--muted); }
  .hero-note strong { color: var(--ink); }

  /* Unit AC indoor sebagai demo panduan error */
  .unit-demo { background: var(--deep); border-radius: var(--radius-lg); padding: 28px; color: var(--white); }
  .unit {
    background: linear-gradient(#FFFFFF, #EAF1F4);
    border-radius: 18px 18px 26px 26px;
    padding: 22px 22px 0;
    box-shadow: 0 18px 40px rgba(3, 30, 46, 0.35);
    color: var(--ink);
  }
  .unit-top { display: flex; justify-content: space-between; align-items: center; }
  .unit-label { font-weight: 800; font-stretch: 125%; font-size: 0.9rem; color: #8AA2AE; }
  .lcd {
    background: var(--lcd); border-radius: 6px;
    padding: 6px 14px; min-width: 104px; text-align: center;
    font-family: "Share Tech Mono", monospace; font-size: 1.7rem;
    color: var(--lcd-glow); text-shadow: 0 0 10px rgba(127, 227, 240, 0.7);
    letter-spacing: 0.08em;
  }
  .lcd.blink { animation: blink 0.9s steps(2, start) 2; }
  @keyframes blink { to { visibility: hidden; } }
  .vent { margin-top: 22px; height: 46px; border-top: 1px solid #D3E0E6;
    background: repeating-linear-gradient(#F7FAFB 0 6px, #D9E4E9 6px 8px); border-radius: 0 0 24px 24px; }
  .demo-caption { margin: 22px 0 12px; font-weight: 600; }
  .codes { display: flex; flex-wrap: wrap; gap: 8px; }
  .codes button {
    font: inherit; font-size: 0.9rem; font-weight: 600;
    background: rgba(255,255,255,0.08); color: var(--white);
    border: 1px solid rgba(255,255,255,0.3); border-radius: 999px;
    padding: 7px 14px; cursor: pointer;
  }
  .codes button[aria-pressed="true"] { background: var(--white); color: var(--deep); border-color: var(--white); }
  .diagnosis { margin-top: 16px; background: rgba(255,255,255,0.08); border-radius: 12px; padding: 16px 18px; min-height: 112px; }
  .diagnosis h3 { font-size: 1.05rem; margin-bottom: 6px; }
  .diagnosis p { font-size: 0.95rem; color: #D2E4EC; }
  .demo-disclaimer { margin-top: 12px; font-size: 0.8rem; color: #A9C6D3; }

  @media (max-width: 900px) {
    .hero-grid { grid-template-columns: 1fr; gap: 40px; }
    .hero { padding-top: 40px; }
  }

  /* ---------- Section umum ---------- */
  section { padding: 84px 0; }
  .section-head { max-width: 720px; margin-bottom: 44px; }
  .section-head h2 { margin-bottom: 14px; }

  /* ---------- Untuk siapa ---------- */
  .audience { background: var(--white); }
  .aud-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; border-top: 2px solid var(--ink); }
  .aud { padding: 26px 26px 0 0; }
  .aud + .aud { padding-left: 26px; border-left: 1px solid var(--line); }
  .aud h3 { margin-bottom: 8px; }
  .aud p { color: var(--muted); }
  @media (max-width: 760px) {
    .aud-grid { grid-template-columns: 1fr; }
    .aud + .aud { padding-left: 0; border-left: 0; border-top: 1px solid var(--line); margin-top: 26px; }
  }

  /* ---------- Fitur ---------- */
  .feature-main { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; margin-bottom: 64px; }
  .feature-main h3 { font-size: 1.6rem; margin-bottom: 14px; }
  .feature-main ul { margin: 18px 0 0; padding-left: 20px; color: var(--muted); }
  .feature-main li { margin-bottom: 6px; }

  .invoice {
    background: var(--white); border-radius: var(--radius-sm);
    padding: 28px; box-shadow: 0 1px 0 var(--line), 0 20px 50px rgba(11, 74, 111, 0.12);
    font-size: 0.92rem; transform: rotate(-1.2deg);
  }
  .inv-head { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 20px; }
  .inv-logo { width: 44px; height: 44px; border-radius: 10px; background: var(--deep); color: var(--white);
    display: grid; place-items: center; font-weight: 800; font-stretch: 125%; }
  .inv-head .num { text-align: right; color: var(--muted); }
  .inv-head .num strong { display: block; color: var(--ink); font-size: 1.05rem; }
  .inv table { width: 100%; border-collapse: collapse; }
  .invoice table { width: 100%; border-collapse: collapse; }
  .invoice td { padding: 9px 0; border-bottom: 1px dashed var(--line); }
  .invoice td:last-child { text-align: right; font-variant-numeric: tabular-nums; }
  .invoice tr.total td { border-bottom: 0; padding-top: 14px; font-weight: 800; font-size: 1.05rem; }
  .inv-status { display: inline-block; margin-top: 14px; background: #FCEBDD; color: var(--copper-dark);
    font-weight: 700; font-size: 0.82rem; padding: 4px 10px; border-radius: 999px; }

  .feature-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 36px 48px; }
  .feature-item { display: grid; grid-template-columns: 48px 1fr; gap: 16px; }
  .icon { width: 48px; height: 48px; border-radius: 12px; background: var(--ice); color: var(--deep);
    display: grid; place-items: center; }
  .icon svg { width: 24px; height: 24px; }
  .feature-item h3 { margin-bottom: 6px; }
  .feature-item p { color: var(--muted); }
  @media (max-width: 860px) {
    .feature-main, .feature-list { grid-template-columns: 1fr; }
    .invoice { transform: none; }
  }

  /* ---------- Alur kerja (memang berurutan) ---------- */
  .flow { background: var(--deep); color: var(--white); }
  .flow .lead { color: #C7DDE7; }
  .steps { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(5, 1fr); gap: 0; counter-reset: step; }
  .steps li { counter-increment: step; padding: 0 18px 0 0; position: relative; }
  .steps li::before {
    content: counter(step); display: grid; place-items: center;
    width: 40px; height: 40px; border-radius: 50%;
    background: var(--white); color: var(--deep); font-weight: 800; margin-bottom: 16px;
  }
  .steps li::after {
    content: ""; position: absolute; top: 20px; left: 48px; right: 8px;
    border-top: 2px dotted rgba(255,255,255,0.4);
  }
  .steps li:last-child::after { display: none; }
  .steps h3 { margin-bottom: 6px; font-size: 1.05rem; }
  .steps p { color: #C7DDE7; font-size: 0.95rem; }
  @media (max-width: 900px) {
    .steps { grid-template-columns: 1fr; gap: 26px; }
    .steps li { padding: 0 0 0 58px; }
    .steps li::before { position: absolute; left: 0; top: 0; }
    .steps li::after { display: none; }
  }

  /* ---------- Artikel SEO maintenance ---------- */
  .guide-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 56px; }
  .guide-body p + p { margin-top: 16px; }
  .guide-body p { color: var(--muted); max-width: 64ch; }
  .guide-body h3 { margin: 28px 0 8px; }
  .checklist { list-style: none; margin: 16px 0 0; padding: 0; }
  .checklist li { padding: 10px 0 10px 32px; border-bottom: 1px solid var(--line); position: relative; color: var(--ink); }
  .checklist li::before { content: ""; position: absolute; left: 4px; top: 17px; width: 12px; height: 7px;
    border-left: 2px solid var(--copper); border-bottom: 2px solid var(--copper); transform: rotate(-45deg); }
  @media (max-width: 860px) { .guide-grid { grid-template-columns: 1fr; gap: 28px; } }

  /* ---------- FAQ ---------- */
  .faq { background: var(--white); }
  .faq-list { max-width: 820px; }
  details { border-bottom: 1px solid var(--line); }
  summary { cursor: pointer; list-style: none; padding: 20px 40px 20px 0; font-weight: 700; font-size: 1.08rem; position: relative; }
  summary::-webkit-details-marker { display: none; }
  summary::after { content: "+"; position: absolute; right: 6px; top: 16px; font-size: 1.6rem; font-weight: 400; color: var(--deep); }
  details[open] summary::after { content: "–"; }
  details p { padding: 0 0 22px; color: var(--muted); max-width: 68ch; }

  /* ---------- CTA & kontak ---------- */
  .cta-band { text-align: left; }
  .cta-box { background: var(--ice); border-radius: var(--radius-lg); padding: 52px; display: grid; grid-template-columns: 1.3fr 1fr; gap: 40px; align-items: center; }
  .cta-box h2 { margin-bottom: 12px; }
  .contact { list-style: none; margin: 0; padding: 0; }
  .contact li { padding: 10px 0; border-bottom: 1px solid var(--line); }
  .contact li:last-child { border-bottom: 0; }
  .contact span { display: block; font-size: 0.85rem; color: var(--muted); }
  .contact a, .contact strong { font-weight: 600; color: var(--ink); text-decoration: none; }
  .contact a:hover { color: var(--deep); text-decoration: underline; }
  @media (max-width: 860px) { .cta-box { grid-template-columns: 1fr; padding: 32px 24px; } }

  footer { padding: 36px 0 48px; color: var(--muted); font-size: 0.9rem; }
  .foot { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 16px; }
  .foot a { color: var(--muted); }

  @media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    .lcd.blink { animation: none; }
  }

  /* ---------- Galeri screenshot ---------- */
  .shots { background: var(--white); }
  .shot-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
  .shot-grid a {
    padding: 0; border: 1px solid var(--line); border-radius: 14px; overflow: hidden;
    background: var(--ice); cursor: zoom-in; aspect-ratio: 16 / 9;
  }
  .shot-grid img { width: 100%; height: 100%; object-fit: cover; }
  .shot-grid a:hover img { opacity: 0.92; }
  .shot-note { margin-top: 16px; font-size: 0.92rem; color: var(--muted); }
  @media (max-width: 760px) {
    .shot-grid { display: flex; overflow-x: auto; scroll-snap-type: x mandatory; gap: 14px; padding-bottom: 8px; }
    .shot-grid a { flex: 0 0 86%; scroll-snap-align: start; }
  }
  dialog.lightbox { border: 0; padding: 0; background: transparent; max-width: min(1100px, 94vw); }
  dialog.lightbox::backdrop { background: rgba(6, 22, 32, 0.86); }
  dialog.lightbox img { width: 100%; border-radius: 12px; }
  dialog.lightbox form { text-align: right; margin-bottom: 10px; }
  dialog.lightbox button { font: inherit; font-weight: 700; color: var(--white); background: transparent;
    border: 2px solid rgba(255,255,255,0.6); border-radius: 999px; padding: 6px 16px; cursor: pointer; }

  /* ---------- Daftar kota ---------- */
  .cities ul { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 10px; }
  .cities a { display: inline-block; padding: 9px 16px; border-radius: 999px; border: 1px solid var(--line);
    background: var(--white); color: var(--ink); text-decoration: none; font-weight: 600; }
  .cities a:hover { border-color: var(--deep); color: var(--deep); }
  .cities a[aria-current="page"] { background: var(--deep); color: var(--white); border-color: var(--deep); }

  /* ---------- Halaman kota ---------- */
  .crumbs { font-size: 0.9rem; color: var(--muted); margin-bottom: 18px; }
  .crumbs ol { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 6px; }
  .crumbs li + li::before { content: "/"; margin-right: 6px; color: var(--line); }
  .crumbs a { color: var(--muted); }
  .city-hero { padding: 48px 0 64px; }
  .city-hero .lead { margin: 18px 0 28px; }
  .city-split { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; }
  .city-split p + p { margin-top: 14px; }
  .city-split p { color: var(--muted); }
  .area-list { list-style: none; margin: 18px 0 0; padding: 0; columns: 2; column-gap: 24px; }
  .area-list li { padding: 8px 0; border-bottom: 1px solid var(--line); break-inside: avoid; }
  .tip { background: var(--ice); border-left: 4px solid var(--copper); border-radius: 0 12px 12px 0; padding: 20px 22px; margin-top: 24px; }
  .tip h3 { margin-bottom: 6px; }
  .tip p { color: var(--ink); }
  .mini-features { display: grid; grid-template-columns: repeat(4, 1fr); gap: 28px; }
  .mini-features h3 { margin-bottom: 6px; }
  .mini-features p { color: var(--muted); font-size: 0.95rem; }
  @media (max-width: 860px) {
    .city-split { grid-template-columns: 1fr; gap: 28px; }
    .mini-features { grid-template-columns: 1fr 1fr; }
  }
  @media (max-width: 520px) {
    .mini-features { grid-template-columns: 1fr; }
    .area-list { columns: 1; }
  }