/* ============================================================
   INDONESIA TECHNOLOGY CENTRE — prototipe desain
   Arah visual: technical dark, aksen merah-putih,
   bahasa visual gambar teknik (grid, hairline, kode referensi)
   ============================================================ */

:root{
  color-scheme: light;

  /* -- warna dasar: abu-abu terang -- */
  --ground:      #E4E6E7;
  --ground-2:    #DCDFE1;
  --surface:     #F2F3F4;
  --surface-2:   #E9EBEC;
  --line:        #BFC5C8;
  --line-soft:   #D3D7DA;

  /* -- teks: kontras tinggi di atas abu-abu -- */
  --text:        #14181A;   /* 14:1  terhadap --ground */
  --muted:       #4A5459;   /* 6.2:1 */
  --dim:         #565F64;   /* 4.9:1 di latar paling gelap sekalipun */
  --ink:         #0B0E10;   /* penegasan tertinggi */

  /* -- aksen merah-putih -- */
  --merah:       #B0241B;   /* 5.4:1 — aman sebagai teks */
  --merah-hi:    #8E1A13;
  --merah-deep:  #6E140F;
  --putih:       #FFFFFF;   /* untuk teks di ATAS bidang merah */

  /* -- warna sinyal (khusus status data, bukan aksen) -- */
  --ok:          #167057;
  --warn:        #8A5F0A;
  --crit:        #B0241B;

  /* -- tipografi -- */
  --f-display: 'Archivo', 'Helvetica Neue', Arial, sans-serif;
  --f-body:    'IBM Plex Sans', 'Segoe UI', system-ui, sans-serif;
  --f-mono:    'IBM Plex Mono', 'SFMono-Regular', Consolas, monospace;

  --fs-hero:  clamp(2.7rem, 6.4vw, 5.4rem);
  --fs-h1:    clamp(2rem, 3.6vw, 3rem);
  --fs-h2:    clamp(1.45rem, 2.2vw, 2rem);
  --fs-h3:    1.12rem;
  --fs-body:  1rem;
  --fs-sm:    0.875rem;
  --fs-xs:    0.75rem;

  /* -- ritme -- */
  --pad:      clamp(1.25rem, 4vw, 3.5rem);
  --maxw:     1320px;
  --rail:     224px;
}

*{ box-sizing: border-box; }

body{
  margin:0;
  background: var(--ground);
  color: var(--text);
  font-family: var(--f-body);
  font-size: var(--fs-body);
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1,h2,h3,h4{
  font-family: var(--f-display);
  font-weight: 700;
  line-height: 1.06;
  letter-spacing: -0.02em;
  text-wrap: balance;
  margin: 0;
}

p{ margin:0; }
a{ color: inherit; text-decoration: none; }

:focus-visible{
  outline: 2px solid var(--merah-hi);
  outline-offset: 3px;
}

/* ---------- elemen tipografi berulang ---------- */

.mono{
  font-family: var(--f-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.eyebrow{
  font-family: var(--f-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--dim);
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.eyebrow::before{
  content:"";
  width: 26px; height:1px;
  background: var(--merah);
  flex: none;
}

.lede{
  font-size: clamp(1.05rem, 1.4vw, 1.22rem);
  line-height: 1.65;
  color: var(--muted);
  max-width: 62ch;
}

.section-head{
  display:flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1.25rem;
  margin-bottom: 2.25rem;
}
.section-head h2{ font-size: var(--fs-h2); }
.section-head .note{
  font-family: var(--f-mono);
  font-size: var(--fs-xs);
  color: var(--dim);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* ---------- kerangka halaman ---------- */

.wrap{
  max-width: var(--maxw);
  margin: 0 auto;
  padding-inline: var(--pad);
}

section.band{
  border-top: 1px solid var(--line-soft);
  padding-block: clamp(3.25rem, 7vw, 6rem);
}

/* ---------- header / navigasi ---------- */

header.top{
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(228,230,231,0.90);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line-soft);
}
.top-inner{
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--pad);
  height: 68px;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.brand{ display:flex; align-items:center; gap:0.7rem; flex:none; }
.brand-mark{
  width: 34px; height: 34px;
  display:grid; place-items:center;
  border: 1px solid var(--merah-deep);
  background: linear-gradient(160deg, var(--merah) 0%, var(--merah-deep) 100%);
  color: var(--putih);
  font-family: var(--f-display);
  font-weight: 800;
  font-size: 0.72rem;
  letter-spacing: 0.02em;
}
.brand-txt{ display:flex; flex-direction:column; line-height:1.05; }
.brand-txt b{
  font-family: var(--f-display);
  font-weight: 700;
  font-size: 0.9rem;
  letter-spacing: 0.01em;
}
.brand-txt span{
  font-family: var(--f-mono);
  font-size: 0.6rem;
  letter-spacing: 0.16em;
  color: var(--dim);
  text-transform: uppercase;
}

nav.main{
  display:flex;
  align-items:center;
  gap: 0.15rem;
  margin-left: auto;
  flex-wrap: nowrap;
  overflow-x: auto;
  scrollbar-width: none;
}
nav.main::-webkit-scrollbar{ display:none; }

nav.main a{
  font-family: var(--f-mono);
  font-size: 0.68rem;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--muted);
  padding: 0.45rem 0.6rem;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: color .15s ease, border-color .15s ease;
}
nav.main a:hover{ color: var(--text); }
nav.main a.active{ color: var(--ink); border-bottom-color: var(--merah); }

.top-tools{ display:flex; align-items:center; gap:0.5rem; flex:none; }

/* header pada layar kecil: brand + tools di baris atas, menu digulir di bawah */
@media (max-width: 900px){
  .top-inner{
    height: auto;
    flex-wrap: wrap;
    padding-block: 0.6rem;
    gap: 0.6rem 0.9rem;
  }
  .brand{ min-width: 0; }
  .brand-txt{ min-width: 0; overflow: hidden; }
  .brand-txt b{ font-size: 0.8rem; white-space: nowrap; text-overflow: ellipsis; overflow: hidden; }
  .top-tools{ margin-left: auto; }
  nav.main{
    order: 3;
    width: 100%;
    margin-left: 0;
    border-top: 1px solid var(--line-soft);
    padding-top: 0.2rem;
  }
  nav.main a{ padding-inline: 0.5rem; }
}
@media (max-width: 430px){
  .brand-txt span{ display: none; }
  .btn-ask{ padding: 0.45rem 0.6rem; }
}

.lang{
  display:flex;
  border: 1px solid var(--line);
  font-family: var(--f-mono);
  font-size: 0.64rem;
  letter-spacing: 0.1em;
}
.lang button{
  background: none; border: none; cursor: pointer;
  color: var(--dim);
  padding: 0.32rem 0.5rem;
  font: inherit;
}
.lang button.on{ background: var(--surface-2); color: var(--ink); }

.btn-ask{
  display:inline-flex; align-items:center; gap:0.45rem;
  border: 1px solid var(--merah);
  color: var(--merah);
  background: transparent;
  font-family: var(--f-mono);
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.5rem 0.8rem;
  cursor: pointer;
  transition: background .18s ease;
}
.btn-ask:hover{ background: var(--merah); color: var(--putih); }
.btn-ask .dot{
  width:6px;height:6px;border-radius:50%;
  background: var(--merah);
  animation: pulse 2.4s ease-in-out infinite;
}
@keyframes pulse{ 0%,100%{opacity:1} 50%{opacity:.25} }

/* ---------- HERO ---------- */

.hero{
  position: relative;
  border-bottom: 1px solid var(--line-soft);
  overflow: hidden;
  background:
    radial-gradient(900px 480px at 78% -10%, rgba(176,36,27,0.13), transparent 62%),
    linear-gradient(180deg, var(--ground-2), var(--ground));
}
.hero-grid{
  position:absolute; inset:0;
  background-image:
    linear-gradient(to right, rgba(20,24,26,0.055) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(20,24,26,0.055) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(120% 90% at 50% 0%, #000 30%, transparent 78%);
  pointer-events:none;
}
.hero-inner{
  position: relative;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(3.5rem, 8vw, 6.5rem) var(--pad) clamp(2.5rem, 5vw, 4rem);
  display: grid;
  grid-template-columns: minmax(0,1.15fr) minmax(0,0.85fr);
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: end;
}
@media (max-width: 900px){
  .hero-inner{ grid-template-columns: 1fr; align-items: start; }
}

.hero h1{
  font-size: var(--fs-hero);
  font-weight: 800;
  letter-spacing: -0.035em;
  margin: 1.4rem 0 1.5rem;
}
.hero h1 .id{ color: var(--merah); }
.hero-vision{
  margin-top: 2rem;
  padding-left: 1.1rem;
  border-left: 2px solid var(--merah);
  font-family: var(--f-display);
  font-weight: 600;
  font-size: clamp(0.95rem, 1.3vw, 1.1rem);
  line-height: 1.4;
  letter-spacing: 0.01em;
  text-transform: uppercase;
  max-width: 44ch;
}

/* panel skematik di hero */
.schematic{
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(255,255,255,0.92), rgba(242,243,244,0.92));
  padding: 1.1rem;
}
.schematic-head{
  display:flex; justify-content:space-between; align-items:center;
  border-bottom: 1px solid var(--line-soft);
  padding-bottom: 0.7rem; margin-bottom: 0.9rem;
  font-family: var(--f-mono); font-size: 0.64rem;
  letter-spacing: 0.14em; text-transform: uppercase; color: var(--dim);
}
.schematic svg{ width:100%; height:auto; display:block; }
.schematic-foot{
  margin-top: 0.85rem; padding-top: 0.7rem;
  border-top: 1px solid var(--line-soft);
  font-family: var(--f-mono); font-size: 0.64rem;
  color: var(--dim); letter-spacing: 0.05em; line-height:1.6;
}

/* strip statistik di bawah hero */
.hero-strip{
  position: relative;
  border-top: 1px solid var(--line-soft);
  background: rgba(255,255,255,0.55);
}
.hero-strip-inner{
  max-width: var(--maxw); margin:0 auto; padding-inline: var(--pad);
  display:grid; grid-template-columns: repeat(4, 1fr);
}
.hero-strip .cell{
  padding: 1.1rem 1.2rem 1.1rem 0;
  border-right: 1px solid var(--line-soft);
}
.hero-strip .cell:last-child{ border-right:none; }
.hero-strip .cell:not(:first-child){ padding-left: 1.2rem; }
.hero-strip b{
  display:block;
  font-family: var(--f-display);
  font-size: 1.5rem; font-weight: 700;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}
.hero-strip span{
  font-family: var(--f-mono); font-size: 0.62rem;
  letter-spacing: 0.13em; text-transform: uppercase; color: var(--dim);
}
@media (max-width: 760px){
  .hero-strip-inner{ grid-template-columns: repeat(2,1fr); }
  .hero-strip .cell:nth-child(2){ border-right:none; }
}

/* ---------- rantai pengetahuan ---------- */

.chain{
  display:grid;
  grid-template-columns: repeat(5, 1fr);
  border: 1px solid var(--line);
  background: var(--ground-2);
}
@media (max-width: 820px){ .chain{ grid-template-columns: 1fr 1fr; } }
@media (max-width: 480px){ .chain{ grid-template-columns: 1fr; } }

.chain .node{
  position: relative;
  padding: 1.35rem 1.25rem 1.5rem;
  border-right: 1px solid var(--line-soft);
  cursor: default;
  transition: background .2s ease;
}
.chain .node:last-child{ border-right:none; }
.chain .node:hover{ background: var(--surface); }
.chain .node .step{
  font-family: var(--f-mono); font-size: 0.62rem;
  letter-spacing: 0.14em; color: var(--dim);
}
.chain .node h4{
  font-size: 1.02rem; margin: 0.55rem 0 0.5rem;
  letter-spacing: 0.01em; text-transform: uppercase;
}
.chain .node p{ font-size: var(--fs-sm); color: var(--muted); line-height:1.55; }
.chain .node::after{
  content:"";
  position:absolute; right:-5px; top: 1.6rem;
  width:9px; height:9px;
  border-top:1px solid var(--merah); border-right:1px solid var(--merah);
  transform: rotate(45deg);
  background: var(--ground-2);
}
.chain .node:last-child::after{ display:none; }
@media (max-width: 820px){ .chain .node::after{ display:none; } }
.chain .node:nth-child(4) h4,
.chain .node:nth-child(5) h4{ color: var(--merah-hi); }

/* ---------- kartu bidang / centre ---------- */

.grid-6{
  display:grid;
  grid-template-columns: repeat(auto-fit, minmax(215px,1fr));
  background: var(--ground);
  border: 1px solid var(--line-soft);
}
.field{
  border-right: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
  padding: 1.6rem 1.3rem 1.7rem;
  transition: background .2s ease;
  position: relative;
}
.field:hover{ background: var(--surface); }
.field .code{
  font-family: var(--f-mono); font-size: 0.62rem;
  letter-spacing: 0.14em; color: var(--merah);
}
.field h3{
  font-size: var(--fs-h3); margin: 0.7rem 0 0.55rem;
  text-transform: uppercase; letter-spacing: 0.01em;
}
.field p{ font-size: var(--fs-sm); color: var(--muted); line-height:1.55; }

.centres{
  display:grid;
  grid-template-columns: repeat(auto-fit, minmax(300px,1fr));
  gap: 1rem;
}
.centre{
  display:block;
  border: 1px solid var(--line);
  background: var(--surface);
  padding: 1.4rem 1.35rem 1.5rem;
  transition: border-color .2s ease, transform .2s ease, background .2s ease;
}
.centre:hover{
  border-color: var(--merah);
  background: var(--surface-2);
  transform: translateY(-2px);
}
.centre-top{
  display:flex; align-items:center; justify-content:space-between;
  border-bottom: 1px solid var(--line-soft);
  padding-bottom: 0.7rem; margin-bottom: 0.9rem;
}
.centre-top .id{
  font-family: var(--f-mono); font-size: 0.66rem;
  letter-spacing: 0.14em; color: var(--merah);
}
.centre-top .arrow{ color: var(--dim); font-size: 0.9rem; }
.centre h3{ font-size: var(--fs-h3); text-transform: uppercase; letter-spacing:0.01em; }
.centre p{ font-size: var(--fs-sm); color: var(--muted); margin-top: 0.55rem; }
.tags{ display:flex; flex-wrap:wrap; gap:0.35rem; margin-top: 1rem; }
.tag{
  font-family: var(--f-mono); font-size: 0.6rem;
  letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--dim);
  border: 1px solid var(--line);
  padding: 0.18rem 0.42rem;
}

/* ---------- panel ASK ITC ---------- */

.ask{
  border: 1px solid var(--line);
  background:
    radial-gradient(700px 320px at 15% 0%, rgba(176,36,27,0.09), transparent 60%),
    var(--surface);
}
.ask-head{
  display:flex; flex-wrap:wrap; gap:0.75rem;
  align-items:center; justify-content:space-between;
  padding: 0.85rem 1.2rem;
  border-bottom: 1px solid var(--line-soft);
  font-family: var(--f-mono); font-size: 0.64rem;
  letter-spacing: 0.14em; text-transform: uppercase; color: var(--dim);
}
.ask-body{ padding: clamp(1.2rem, 3vw, 2rem); }
.ask-q{
  display:flex; align-items:center; gap:0.75rem;
  border: 1px solid var(--line);
  background: var(--ground);
  padding: 0.85rem 1rem;
}
.ask-q .caret{ color: var(--merah); font-family: var(--f-mono); }
.ask-q .qtext{
  font-family: var(--f-body); font-size: 1rem; color: var(--text);
  min-height: 1.5em;
}
.ask-chips{ display:flex; flex-wrap:wrap; gap:0.5rem; margin-top: 0.9rem; }
.chip{
  font-family: var(--f-mono); font-size: 0.64rem;
  letter-spacing: 0.06em;
  color: var(--muted);
  background: var(--ground);
  border: 1px solid var(--line);
  padding: 0.4rem 0.65rem;
  cursor: pointer;
  transition: border-color .15s ease, color .15s ease;
}
.chip:hover, .chip.on{ border-color: var(--merah); color: var(--ink); }

.answer{
  margin-top: 1.4rem;
  border-top: 1px solid var(--line-soft);
  padding-top: 1.4rem;
  display:grid;
  grid-template-columns: repeat(auto-fit, minmax(228px,1fr));
  background: var(--ground);
  border: 1px solid var(--line-soft);
}
.answer .blk{
  padding: 1.1rem;
  border-right: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}
.answer .blk .lab{
  font-family: var(--f-mono); font-size: 0.6rem;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--merah); display:block; margin-bottom: 0.55rem;
}
.answer .blk ul{ margin:0; padding-left: 1rem; }
.answer .blk li{ font-size: var(--fs-sm); color: var(--muted); margin-bottom: 0.3rem; }
.answer .blk p{ font-size: var(--fs-sm); color: var(--muted); }
.ask-foot{
  font-family: var(--f-mono); font-size: 0.62rem;
  color: var(--dim); letter-spacing: 0.06em;
  margin-top: 0.9rem; line-height: 1.6;
}

/* ---------- tabel lesson learned ---------- */

.ll-table{ border: 1px solid var(--line); overflow-x:auto; }
.ll-row{
  display:grid;
  grid-template-columns: 92px minmax(200px,1.5fr) 1fr 1fr 128px;
  gap: 0;
  border-bottom: 1px solid var(--line-soft);
  min-width: 780px;
  transition: background .18s ease;
}
.ll-row:last-child{ border-bottom:none; }
.ll-row.head{ background: var(--surface-2); }
.ll-row:not(.head):hover{ background: var(--surface); }
.ll-row > div{ padding: 0.85rem 1rem; font-size: var(--fs-sm); color: var(--muted); }
.ll-row.head > div{
  font-family: var(--f-mono); font-size: 0.62rem;
  letter-spacing: 0.12em; text-transform: uppercase; color: var(--dim);
}
.ll-row .case{ font-family: var(--f-mono); color: var(--merah); font-size: 0.72rem; }
.ll-row .title{ color: var(--text); font-weight: 500; }
.pill{
  font-family: var(--f-mono); font-size: 0.6rem;
  letter-spacing: 0.08em; text-transform: uppercase;
  padding: 0.16rem 0.45rem; border:1px solid currentColor;
  display:inline-block;
}
.pill.ok{ color: var(--ok); }
.pill.warn{ color: var(--warn); }
.pill.crit{ color: var(--crit); }

/* ---------- kutipan / technology thinking ---------- */

.quotes{
  display:grid;
  grid-template-columns: repeat(auto-fit, minmax(280px,1fr));
  gap: 1rem;
}
.quote{
  border: 1px solid var(--line);
  border-top: 2px solid var(--merah);
  background: var(--surface);
  padding: 1.5rem 1.35rem;
  display:flex; flex-direction: column; gap: 0.9rem;
}
.quote q{
  font-family: var(--f-display);
  font-weight: 600; font-size: 1.06rem; line-height: 1.4;
  letter-spacing: -0.01em; quotes: none;
}
.quote .src{
  font-family: var(--f-mono); font-size: 0.62rem;
  letter-spacing: 0.12em; text-transform: uppercase; color: var(--dim);
  margin-top: auto;
}

/* ---------- band Indonesia ---------- */

.indo{
  position: relative;
  border-top: 1px solid var(--line-soft);
  background: linear-gradient(180deg, var(--ground), #D6DADC);
  overflow: hidden;
}
.indo::before{
  content:""; position:absolute; inset:0;
  background: linear-gradient(180deg, var(--merah) 0 50%, var(--ink) 50% 100%);
  opacity: 0.14;
  mask-image: radial-gradient(70% 120% at 82% 50%, #000, transparent 70%);
}
.indo-inner{
  position: relative;
  max-width: var(--maxw); margin: 0 auto;
  padding: clamp(3rem, 6vw, 5rem) var(--pad);
  display:grid; grid-template-columns: minmax(0,1.2fr) minmax(0,0.8fr);
  gap: clamp(1.5rem, 4vw, 3.5rem); align-items: center;
}
@media (max-width: 860px){ .indo-inner{ grid-template-columns:1fr; } }
.indo h2{ font-size: clamp(1.7rem, 3.4vw, 2.7rem); margin: 1.1rem 0 1rem; }
.indo h2 em{ font-style: normal; color: var(--merah-hi); }
.indo-list{ display:flex; flex-direction:column; gap:0.75rem; }
.indo-list div{
  border-left: 1px solid var(--line);
  padding-left: 0.9rem;
  font-size: var(--fs-sm);
  color: var(--muted);
}
.indo-list b{
  display:block; color: var(--text);
  font-family: var(--f-mono); font-size: 0.66rem;
  letter-spacing: 0.12em; text-transform: uppercase;
  margin-bottom: 0.15rem;
}

/* ---------- halaman dalam (bukan home) ---------- */

.page-head{
  border-bottom: 1px solid var(--line-soft);
  background: linear-gradient(180deg, var(--ground-2), var(--ground));
}
.page-head-inner{
  max-width: var(--maxw); margin:0 auto;
  padding: clamp(2.5rem,5vw,4rem) var(--pad) clamp(2rem,4vw,3rem);
}
.page-head h1{ font-size: var(--fs-h1); margin: 1rem 0 1rem; }

.split{
  display:grid;
  grid-template-columns: var(--rail) minmax(0,1fr);
  gap: clamp(1.5rem, 4vw, 3rem);
}
.split > *{ min-width: 0; }
@media (max-width: 880px){ .split{ grid-template-columns: 1fr; } }

.rail{
  border-top: 1px solid var(--merah);
  padding-top: 0.9rem;
  align-self: start;
  position: sticky; top: 90px;
}
@media (max-width: 880px){ .rail{ position: static; } }
.rail .rlab{
  font-family: var(--f-mono); font-size: 0.6rem;
  letter-spacing: 0.14em; text-transform: uppercase; color: var(--dim);
  display:block; margin-bottom: 0.7rem;
}
.rail ul{ list-style:none; margin:0; padding:0; display:flex; flex-direction:column; gap:0.3rem; }
.rail li{
  font-family: var(--f-mono); font-size: 0.68rem;
  letter-spacing: 0.06em; color: var(--muted);
  padding: 0.22rem 0;
}
.rail li::before{ content:"— "; color: var(--dim); }

.topic-grid{
  display:grid;
  grid-template-columns: repeat(auto-fit, minmax(240px,1fr));
  background: var(--ground);
  border: 1px solid var(--line-soft);
}
.topic{
  border-right: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
  padding: 1.3rem 1.2rem 1.4rem;
  transition: background .18s ease;
}
.topic:hover{ background: var(--surface); }
.topic .code{
  font-family: var(--f-mono); font-size: 0.6rem;
  letter-spacing: 0.13em; color: var(--merah);
}
.topic h4{
  font-size: 1rem; margin: 0.55rem 0 0.6rem;
  text-transform: uppercase; letter-spacing: 0.01em;
}
.topic ul{ list-style:none; margin:0; padding:0; }
.topic li{
  font-size: var(--fs-sm); color: var(--muted);
  padding: 0.24rem 0;
  border-bottom: 1px dotted var(--line-soft);
}
.topic li:last-child{ border-bottom:none; }

.stack{ display:flex; flex-direction:column; gap: clamp(2.25rem,5vw,3.5rem); }

/* ---------- footer ---------- */

footer{
  border-top: 1px solid var(--line);
  background: var(--ground-2);
}
.foot-inner{
  max-width: var(--maxw); margin:0 auto;
  padding: clamp(2.5rem,5vw,4rem) var(--pad) 2rem;
  display:grid;
  grid-template-columns: minmax(0,1.3fr) repeat(auto-fit, minmax(150px, 1fr));
  gap: 2rem;
}
.foot-col h5{
  font-family: var(--f-mono); font-size: 0.62rem;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--merah); margin: 0 0 0.8rem;
}
.foot-col ul{ list-style:none; margin:0; padding:0; display:flex; flex-direction:column; gap:0.4rem; }
.foot-col a{ font-size: var(--fs-sm); color: var(--muted); }
.foot-col a:hover{ color: var(--text); }
.foot-bar{
  border-top: 1px solid var(--line-soft);
  padding: 1rem var(--pad);
  max-width: var(--maxw); margin: 0 auto;
  display:flex; flex-wrap:wrap; gap:0.75rem; justify-content:space-between;
  font-family: var(--f-mono); font-size: 0.62rem;
  letter-spacing: 0.08em; color: var(--dim);
}


/* ---------- Knowledge Centre ---------- */

.kb-stats{
  display:grid;
  grid-template-columns: repeat(auto-fit, minmax(150px,1fr));
  border-top: 1px solid var(--line-soft);
  margin-top: 2rem;
}
.kb-stats div{
  padding: 1rem 1.2rem 1rem 0;
  border-right: 1px solid var(--line-soft);
}
.kb-stats div:last-child{ border-right:none; }
.kb-stats b{
  display:block; font-family: var(--f-display);
  font-size: 1.35rem; font-weight: 700; letter-spacing:-0.02em;
  font-variant-numeric: tabular-nums;
}
.kb-stats span{
  font-family: var(--f-mono); font-size: 0.6rem;
  letter-spacing: 0.13em; text-transform: uppercase; color: var(--dim);
}

.series{ border-top: 1px solid var(--merah); }
.series-row{
  display:grid; grid-template-columns: 46px 1fr; gap: 1rem;
  padding: 0.8rem 0.4rem 0.8rem 0;
  border-bottom: 1px solid var(--line-soft);
  transition: background .16s ease;
}
.series-row:hover{ background: var(--surface); }
.series-row .n{
  font-family: var(--f-mono); font-size: 0.78rem;
  color: var(--dim); font-variant-numeric: tabular-nums;
  padding-top: 0.15rem;
}
.series-row:hover .n{ color: var(--merah); }
.series-row b{
  display:block; font-family: var(--f-display);
  font-size: 0.96rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.01em;
}
.series-row span{ font-size: 0.85rem; color: var(--muted); line-height:1.5; }

.kb-tools{
  display:flex; flex-wrap:wrap; gap: 0.6rem;
  align-items:center; margin-bottom: 1.1rem;
}
.kb-search{
  display:flex; align-items:center; gap: 0.6rem;
  border: 1px solid var(--line); background: var(--ground);
  padding: 0.55rem 0.85rem; flex: 1 1 250px;
}
.kb-search .pfx{ color: var(--merah); font-family: var(--f-mono); font-size: 0.7rem; }
.kb-search input{
  flex:1; min-width:0; background: transparent; border: 0;
  color: var(--text); font-family: var(--f-body); font-size: 0.92rem;
}
.kb-search input:focus{ outline: none; }
.kb-search input::placeholder{ color: var(--dim); }

.kb-scroll{ overflow-x: auto; border: 1px solid var(--line); }
.kb-row{
  display:grid;
  grid-template-columns: 100px minmax(230px,1.7fr) 132px 1fr 104px;
  border-bottom: 1px solid var(--line-soft);
  min-width: 830px;
  transition: background .16s ease;
}
.kb-row:last-child{ border-bottom:none; }
.kb-row.head{ background: var(--surface-2); }
.kb-row:not(.head):hover{ background: var(--surface); }
.kb-row > div{ padding: 0.8rem 1rem; font-size: var(--fs-sm); color: var(--muted); }
.kb-row.head > div{
  font-family: var(--f-mono); font-size: 0.62rem;
  letter-spacing: 0.12em; text-transform: uppercase; color: var(--dim);
}
.kb-row .kcode{ font-family: var(--f-mono); font-size: 0.7rem; color: var(--merah); }
.kb-row .ktitle{ color: var(--text); font-weight: 500; }
.kb-row .kkind{
  font-family: var(--f-mono); font-size: 0.62rem;
  letter-spacing: 0.1em; text-transform: uppercase; color: var(--dim);
}
.kb-empty{
  padding: 2rem 1rem; text-align:center;
  font-family: var(--f-mono); font-size: 0.7rem;
  letter-spacing: 0.1em; color: var(--dim);
}
.kb-count{
  font-family: var(--f-mono); font-size: 0.62rem;
  letter-spacing: 0.1em; text-transform: uppercase; color: var(--dim);
  margin-top: 0.8rem; display:block;
}

.schema-wrap{ overflow-x:auto; border: 1px solid var(--line); background: var(--surface); }
.schema{ min-width: 560px; font-family: var(--f-mono); font-size: 0.76rem; }
.schema .r{ display:grid; grid-template-columns: 168px 96px 1fr; border-bottom: 1px solid var(--line-soft); }
.schema .r:last-child{ border-bottom:none; }
.schema .r > div{ padding: 0.5rem 0.85rem; }
.schema .r.h{
  background: var(--surface-2); color: var(--dim);
  font-size: 0.6rem; letter-spacing: 0.12em; text-transform: uppercase;
}
.schema .k{ color: var(--merah); }
.schema .ty{ color: var(--ok); }
.schema .v{ color: var(--muted); }

.rail li:has(b){ display:flex; gap: 0.75rem; align-items: baseline; }
.rail li b{
  color: var(--dim); font-weight: 400;
  margin-left: auto; flex: none;
  font-variant-numeric: tabular-nums;
}


/* ---------- Engineering Centre ---------- */

.sld-wrap{
  border: 1px solid var(--line);
  background:
    linear-gradient(180deg, rgba(255,255,255,0.85), rgba(242,243,244,0.85));
  padding: 1rem 1rem 0.6rem;
}
.sld-head{
  display:flex; flex-wrap:wrap; gap:0.6rem;
  justify-content:space-between; align-items:center;
  border-bottom: 1px solid var(--line-soft);
  padding-bottom: 0.7rem; margin-bottom: 0.9rem;
  font-family: var(--f-mono); font-size: 0.63rem;
  letter-spacing: 0.14em; text-transform: uppercase; color: var(--dim);
}
.sld-scroll{ overflow-x: auto; }
.sld-scroll svg{ display:block; width:100%; min-width: 640px; height:auto; }

.sld-wire{ stroke: #7B858A; stroke-width: 1.6; fill: none; }
.sld-bus{ stroke: #4A5459; stroke-width: 5; stroke-linecap: square; }
.sld-static{ fill: none; stroke: #7B858A; stroke-width: 1.6; }
.sld-tag{
  fill: #565F64; font-family: 'IBM Plex Mono', monospace;
  font-size: 9px; letter-spacing: 1px;
}

.sld-node{ cursor: pointer; }
.sld-node .hit{ fill: transparent; stroke: none; }
.sld-node .sym{
  fill: #FFFFFF; stroke: #566065; stroke-width: 1.7;
  transition: stroke .18s ease, fill .18s ease;
}
.sld-node .sym-line{
  fill: none; stroke: #566065; stroke-width: 1.7;
  transition: stroke .18s ease;
}
.sld-node .glyph{
  fill: #14181A; font-family: 'Archivo', sans-serif;
  font-size: 15px; font-weight: 700; text-anchor: middle;
}
.sld-node .lab{
  fill: #4A5459; font-family: 'IBM Plex Mono', monospace;
  font-size: 9px; letter-spacing: 1px; text-anchor: middle;
  transition: fill .18s ease;
}
.sld-node:hover .sym, .sld-node.on .sym{ stroke: var(--merah); fill: #FBEBE9; }
.sld-node:hover .sym-line, .sld-node.on .sym-line{ stroke: var(--merah); }
.sld-node:hover .lab, .sld-node.on .lab{ fill: var(--ink); }
.sld-node:focus{ outline: none; }
.sld-node:focus-visible .sym, .sld-node:focus-visible .sym-line{ stroke: var(--merah-hi); }

.sld-hint{
  font-family: var(--f-mono); font-size: 0.62rem;
  letter-spacing: 0.08em; color: var(--dim);
  padding: 0.6rem 0 0.2rem;
}

.kb-row.calc{ grid-template-columns: 80px 186px 1fr 1fr 168px; min-width: 900px; }
.kb-row.std{ grid-template-columns: 134px 1fr 190px; min-width: 700px; }

.formulas{
  display:grid; grid-template-columns: repeat(auto-fit, minmax(238px,1fr));
  background: var(--ground); border: 1px solid var(--line-soft);
}
.formula{
  padding: 1.1rem;
  border-right: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}
.formula .lab{
  font-family: var(--f-mono); font-size: 0.6rem;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--merah); display:block; margin-bottom: 0.55rem;
}
.formula code{
  display:block; font-family: var(--f-mono); font-size: 0.8rem;
  color: var(--text); line-height: 1.55; margin-bottom: 0.5rem;
}
.formula p{ font-size: var(--fs-sm); color: var(--muted); }

.matrix{ overflow-x: auto; border: 1px solid var(--line); }
.matrix table{ border-collapse: collapse; width: 100%; min-width: 700px; }
.matrix th, .matrix td{
  border: 1px solid var(--line-soft);
  padding: 0.75rem 0.9rem; text-align: left; vertical-align: top;
}
.matrix thead th{
  background: var(--surface-2); font-family: var(--f-mono);
  font-size: 0.6rem; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--dim); font-weight: 400;
}
.matrix tbody th{
  background: var(--surface); width: 200px;
  font-family: var(--f-display); font-size: 0.86rem; font-weight: 600;
  color: var(--text); letter-spacing: 0.01em;
}
.matrix tbody th span{
  display:block; font-family: var(--f-mono); font-size: 0.6rem;
  letter-spacing: 0.1em; color: var(--dim); font-weight: 400; margin-top: 0.2rem;
}
.matrix td{ color: var(--muted); font-size: var(--fs-sm); }
.matrix td b{
  display:block; color: var(--merah-hi); font-family: var(--f-mono);
  font-size: 0.64rem; letter-spacing: 0.09em; margin-bottom: 0.25rem;
}

/* ---------- utilitas ---------- */

.page{ display:none; }
.page.on{ display:block; animation: fade .32s ease; }
@keyframes fade{ from{ opacity:0; transform: translateY(6px);} to{opacity:1; transform:none;} }

.reveal{ opacity:0; transform: translateY(14px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in{ opacity:1; transform:none; }

@media (prefers-reduced-motion: reduce){
  *{ animation: none !important; transition: none !important; }
  .reveal{ opacity:1; transform:none; }
}