/* Inter Tight — SELF-HOSTED variable font (latin subset). Matches ARC
   homepage typography without loading from Google Fonts CDN (honors the
   workspace no-external-font-dependency rule: file served locally). */
@font-face {
  font-family: "Inter Tight";
  font-style: normal;
  font-weight: 400 800;
  font-display: swap;
  src: url("lib/fonts/inter-tight-latin.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

:root {
  /* Aligned to ARC Institute homepage design system (arc-institute.css):
     Oxford blue brand + Georgia titles + Inter Tight (self-hosted). */
  --oxford: #002147;          /* ARC primary brand */
  --oxford-2: #0a315f;
  --c-bg: #f5f6f3;            /* homepage --paper */
  --c-mist: #ecefed;
  --c-panel: #ffffff;
  --c-border: #d8ded8;        /* homepage --line */
  --c-text: #162230;          /* homepage --ink */
  --c-muted: #697583;         /* homepage --muted */
  --c-accent: #002147;        /* Oxford blue (was maroon) */
  --c-accent-soft: #e2e8f0;
  --c-blue: #0d8a9b;          /* homepage --teal */
  --c-green: #008c63;         /* homepage --green */
  --c-amber: #b18421;         /* homepage --gold */
  --c-red: #b85742;           /* homepage --red (sparingly) */
  --c-grey: #cfcabf;
  --soft-shadow: 0 10px 34px rgba(0, 33, 71, .10);
  --card-shadow: 0 14px 44px rgba(0, 33, 71, .08);
  --font-title: Georgia, "Times New Roman", Times, serif;
  --font-body: "Inter Tight", Arial, Helvetica, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--c-bg);
  color: var(--c-text);
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.45;
}

h1, h2, h3, h4 { font-family: var(--font-title); font-weight: normal; margin: 0 0 0.4em; color: var(--c-text); }
h2 { font-size: 18px; }
h3 { font-size: 15px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--c-panel);
  border-bottom: 2px solid var(--c-accent);
  padding: 14px 22px;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
}

.brand-title { font-family: var(--font-title); font-size: 22px; font-weight: bold; }
.brand-subtitle { font-size: 12px; color: var(--c-muted); }
.brand-source { font-size: 11px; color: var(--c-muted); text-align: right; }

.layout {
  display: grid;
  grid-template-columns: minmax(320px, 380px) 1fr;
  gap: 18px;
  padding: 18px 22px 32px;
  align-items: start;
}

.panel {
  background: var(--c-panel);
  border: 1px solid rgba(0, 33, 71, .10);
  border-radius: 18px;
  padding: 18px;
  box-shadow: var(--card-shadow);
}

.panel-controls { position: sticky; top: 80px; max-height: calc(100vh - 100px); overflow-y: auto; }

/* Preset buttons */
.preset-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  margin-bottom: 16px;
}
.preset-btn {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: 12px;
  padding: 9px 11px;
  cursor: pointer;
  font-family: var(--font-body);
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: 2px;
  transition: background .12s ease;
}
.preset-btn:hover { background: #faf6ef; }
.preset-btn.active {
  background: var(--c-accent-soft);
  border-color: var(--c-accent);
}
.preset-tag {
  font-family: var(--font-title);
  font-weight: bold;
  font-size: 12px;
  color: var(--c-accent);
  letter-spacing: 0.05em;
}
.preset-name { font-size: 12px; }

/* Sliders */
.sliders { display: flex; flex-direction: column; gap: 12px; margin-bottom: 14px; }
.slider-row { display: grid; grid-template-columns: 1fr; gap: 4px; }
.slider-row-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 12px;
}
.slider-label { font-weight: bold; }
.slider-value {
  font-family: var(--font-title);
  color: var(--c-accent);
  font-size: 14px;
}
.slider-row input[type="range"] {
  width: 100%;
  accent-color: var(--c-accent);
}
.slider-detents {
  display: flex;
  justify-content: space-between;
  font-size: 10px;
  color: var(--c-muted);
  margin-top: -2px;
}

/* Cost editor */
.cost-editor {
  border-top: 1px dashed var(--c-border);
  padding-top: 10px;
  margin-top: 6px;
  font-size: 12px;
}
.cost-editor summary {
  cursor: pointer;
  font-weight: bold;
  font-family: var(--font-title);
  font-size: 13px;
  margin-bottom: 6px;
}
.cost-field {
  display: grid;
  grid-template-columns: 1fr 100px;
  gap: 6px;
  margin-bottom: 4px;
  align-items: center;
}
.cost-field label { font-size: 11px; }
.cost-field input {
  width: 100%;
  border: 1px solid var(--c-border);
  border-radius: 2px;
  padding: 3px 5px;
  font-family: var(--font-body);
  font-size: 12px;
  text-align: right;
}
.cost-field.provisional label::after {
  content: " ⚠";
  color: var(--c-amber);
}
.link-btn {
  background: none;
  border: none;
  color: var(--c-blue);
  cursor: pointer;
  padding: 4px 0;
  font-size: 11px;
  text-decoration: underline;
}

.footnote { font-size: 11px; color: var(--c-muted); margin-top: 12px; }
.footnote a { color: var(--c-blue); }

/* KPI */
.kpi-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin-bottom: 14px;
}
.kpi-tile {
  background: var(--c-panel);
  border: 1px solid rgba(0, 33, 71, .10);
  border-radius: 14px;
  padding: 13px 15px;
  box-shadow: var(--soft-shadow);
}
.kpi-label {
  font-size: 11px;
  color: var(--c-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.kpi-value {
  font-family: var(--font-title);
  font-size: 24px;
  font-weight: bold;
  margin-top: 4px;
  color: var(--c-text);
}
.kpi-delta { font-size: 11px; margin-top: 2px; }
.kpi-delta.good { color: var(--c-green); }
.kpi-delta.bad { color: var(--c-accent); }

/* Tabs */
.tab-strip {
  display: flex;
  gap: 0;
  margin: -18px -18px 14px;
  padding: 0 16px;
  border-bottom: 2px solid var(--c-border);
  background: var(--c-mist);
  border-radius: 18px 18px 0 0;
}
.tab-btn {
  background: none;
  border: none;
  border-bottom: 3px solid transparent;
  padding: 12px 18px;
  font-family: var(--font-title);
  font-size: 14px;
  cursor: pointer;
  color: var(--c-muted);
  margin-bottom: -2px;
  transition: color .12s, border-color .12s;
}
.tab-btn:hover { color: var(--c-text); }
.tab-btn.active {
  color: var(--c-accent);
  border-bottom-color: var(--c-accent);
  font-weight: bold;
}
.tab-content { display: none; }
.tab-content.active { display: block; }

/* =====================================================================
   METHODOLOGY + LIMITATIONS — editorial/academic palette
   Scoped under #tab-methodology / #tab-limitations to NOT affect main
   Results tab styling. Deep-ink + analytical-teal + muted-ochre.
   No maroon/red here.
   ===================================================================== */
#tab-methodology, #tab-limitations {
  /* Editorial palette aligned to ARC homepage tokens (oxford/teal/gold). */
  --m-ink:        #162230;   /* homepage --ink */
  --m-ink-soft:   #34465c;
  --m-paper:      #f5f6f3;   /* homepage --paper */
  --m-paper-deep: #ecefed;   /* homepage --mist (table rows) */
  --m-rule:       #d8ded8;   /* homepage --line */
  --m-rule-soft:  #e6eae6;
  --m-teal:       #0d8a9b;   /* homepage --teal */
  --m-teal-soft:  #e0eef0;
  --m-ochre:      #b18421;   /* homepage --gold (kicker / validated) */
  --m-ochre-soft: #f4ecd6;
  --m-plum:       #b85742;   /* homepage --red (limitation flag, used sparingly) */
  --m-plum-soft:  #f4e2dd;
  --m-bronze:     #b18421;   /* gold (medium scoring) */

  background: var(--m-paper);
  color: var(--m-ink);
  padding: 8px 4px 24px;
  margin: -16px -16px -16px;          /* edge-to-edge inside .panel */
  padding-left: 20px;
  padding-right: 20px;
  border-radius: 0 0 4px 4px;
}

/* Editorial section markers */
.method-section { margin: 28px 0; }
.method-section + .method-section { border-top: 1px solid var(--m-rule-soft); padding-top: 22px; }
.method-section h3 {
  font-family: var(--font-title);
  font-size: 18px;
  color: var(--m-ink);
  margin: 0 0 10px;
  letter-spacing: -0.01em;
  font-weight: normal;
  position: relative;
  padding-left: 0;
}
.method-section h3::before {
  content: "";
  display: block;
  width: 28px;
  height: 2px;
  background: var(--m-ochre);
  margin-bottom: 8px;
}
.method-section h4 {
  font-family: var(--font-title);
  font-size: 14px;
  color: var(--m-ink-soft);
  margin: 18px 0 8px;
  font-weight: normal;
  font-style: italic;
}
.method-section p { margin: 8px 0; color: var(--m-ink); line-height: 1.55; }
.method-section ul, .method-section ol { margin: 8px 0; padding-left: 22px; color: var(--m-ink); }
.method-section li { margin: 4px 0; line-height: 1.5; }
.method-section em { color: var(--m-ink-soft); }
.method-section strong { color: var(--m-ink); font-weight: 600; }
.method-section code {
  font-family: ui-monospace, Menlo, Consolas, monospace;
  background: var(--m-paper-deep);
  color: var(--m-teal);
  padding: 1px 5px;
  border-radius: 2px;
  font-size: 12px;
}
.method-section pre {
  background: var(--m-ink);
  color: var(--m-paper);
  padding: 14px 16px;
  border-radius: 4px;
  font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: 12px;
  overflow-x: auto;
  line-height: 1.45;
}

.method-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12.5px;
  margin: 12px 0;
  background: #fff;
  border: 1px solid var(--m-rule);
}
.method-table th, .method-table td {
  border-bottom: 1px solid var(--m-rule-soft);
  padding: 7px 10px;
  text-align: left;
  vertical-align: top;
  line-height: 1.45;
}
.method-table th {
  background: var(--m-paper-deep);
  font-family: var(--font-title);
  font-weight: normal;
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--m-ink-soft);
  border-bottom: 2px solid var(--m-rule);
}
.method-table tr:last-child td { border-bottom: none; }
.method-table.compact th, .method-table.compact td {
  padding: 5px 9px;
  font-size: 12px;
}
.method-callout {
  background: var(--m-ochre-soft);
  border-left: 3px solid var(--m-ochre);
  padding: 12px 16px;
  margin: 14px 0;
  border-radius: 0 4px 4px 0;
  color: var(--m-ink);
  font-size: 13px;
  line-height: 1.55;
}
.method-callout strong { color: var(--m-ochre); }

/* Override score badge colors in scoped tabs */
#tab-methodology .score-good,
#tab-limitations .score-good   { color: var(--m-teal); font-weight: 600; }
#tab-methodology .score-medium,
#tab-limitations .score-medium { color: var(--m-bronze); font-weight: 600; }
#tab-methodology .score-bad,
#tab-limitations .score-bad    { color: var(--m-plum); font-weight: 600; }
.method-flowchart {
  background: #faf6ef;
  border: 1px solid var(--c-border);
  border-radius: 4px;
  padding: 14px;
  font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: 12px;
  line-height: 1.6;
  white-space: pre;
  overflow-x: auto;
}

/* SVG diagram wrap (scoped variants inside methodology tab) */
#tab-methodology .diagram-wrap,
#tab-limitations .diagram-wrap {
  background: #fff;
  border: 1px solid var(--m-rule);
  border-radius: 4px;
  padding: 18px 14px 10px;
  margin: 12px 0;
}
#tab-methodology .flow-svg,
#tab-limitations .flow-svg {
  width: 100%;
  height: auto;
  max-height: 340px;
}
#tab-methodology .diagram-caption,
#tab-limitations .diagram-caption {
  font-size: 11.5px;
  color: var(--m-ink-soft);
  margin: 8px 0 0;
  text-align: center;
  font-style: italic;
  line-height: 1.4;
}

/* Equation cards — editorial style with side rule */
#tab-methodology .eq-grid,
#tab-limitations .eq-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin: 10px 0;
}
#tab-methodology .eq-card,
#tab-limitations .eq-card {
  background: #fff;
  border: 1px solid var(--m-rule);
  border-left: 3px solid var(--m-teal);
  border-radius: 0 3px 3px 0;
  padding: 10px 12px;
}
#tab-methodology .eq-label,
#tab-limitations .eq-label {
  font-family: var(--font-title);
  font-size: 10.5px;
  color: var(--m-teal);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 5px;
  font-weight: 600;
}
#tab-methodology .eq-formula,
#tab-limitations .eq-formula {
  font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: 12px;
  color: var(--m-ink);
  line-height: 1.5;
}
@media (max-width: 800px) {
  #tab-methodology .eq-grid,
  #tab-limitations .eq-grid { grid-template-columns: 1fr; }
}

/* Language toggle inside methodology/limitations tabs */
.lang-toggle {
  display: inline-flex;
  background: #fff;
  border: 1px solid var(--m-rule);
  border-radius: 999px;
  padding: 2px;
  margin: 4px 0 14px;
  font-family: var(--font-title);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.lang-toggle button {
  background: transparent;
  border: none;
  padding: 5px 14px;
  border-radius: 999px;
  cursor: pointer;
  color: var(--m-ink-soft);
  font-family: inherit;
  font-size: inherit;
  letter-spacing: inherit;
  transition: background .12s, color .12s;
}
.lang-toggle button.active {
  background: var(--m-ink);
  color: var(--m-paper);
}
.lang-toggle button:not(.active):hover { color: var(--m-ink); }

/* Editorial kicker label above tabs */
.tab-kicker {
  font-family: var(--font-title);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--m-ochre);
  margin: 4px 0 0;
}

/* Tighter table variant */
.method-table.compact th, .method-table.compact td {
  padding: 4px 8px;
  font-size: 11.5px;
  line-height: 1.4;
}

/* Tight list spacing */
ul.tight li, ol.tight li { margin: 1px 0; }

/* Muted helper text */
.muted { color: var(--c-muted); font-size: 11px; margin-top: 6px; }
.score-good   { color: var(--c-green); font-weight: bold; }
.score-medium { color: var(--c-amber); font-weight: bold; }
.score-bad    { color: var(--c-accent); font-weight: bold; }

/* Charts */
.chart-card {
  background: var(--c-panel);
  border: 1px solid rgba(0, 33, 71, .10);
  border-radius: 14px;
  padding: 14px 16px;
  margin-bottom: 14px;
  box-shadow: var(--soft-shadow);
}
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
.two-col .chart-card { margin-bottom: 0; }

/* Chart canvases have fixed width/height attributes in HTML.
   CSS forces display:block + max-width:100% so canvas scales DOWN
   responsively for narrow screens but NEVER grows beyond its native size.
   This is the bullet-proof anti-"tumbuh terus" approach. */
.chart-card canvas {
  display: block;
  max-width: 100%;
  height: auto;     /* preserve aspect ratio when width shrinks */
}
.chart-card { overflow: hidden; }

.caption { font-size: 11px; color: var(--c-muted); margin: 4px 0 0; }

/* Summary table */
.summary-table { width: 100%; border-collapse: collapse; font-size: 12px; }
.summary-table th, .summary-table td {
  padding: 5px 8px;
  border-bottom: 1px solid var(--c-border);
  text-align: right;
}
.summary-table th:first-child, .summary-table td:first-child { text-align: left; }
.summary-table th {
  font-family: var(--font-title);
  font-weight: bold;
  background: #faf6ef;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--c-border);
  padding: 14px 22px;
  text-align: center;
  font-size: 11px;
  color: var(--c-muted);
  background: var(--c-panel);
}

@media (max-width: 1100px) {
  .layout { grid-template-columns: 1fr; }
  .panel-controls { position: relative; top: 0; max-height: none; }
  .kpi-strip { grid-template-columns: repeat(2, 1fr); }
  .two-col { grid-template-columns: 1fr; }
}