/* ==========================================================================
   Vietnam Trade Dashboard — Design tokens
   Subject: Vietnamese customs export/import data, public-facing on vncommex.com
   Palette: white background, forest green (#014225) + olive (#556B2F) as
   primary/data-ink, mint (#B9EFD4) as soft highlight, warm orange (#F79D5E)
   as the secondary/accent color (also doubles as the "import" series color).
   ========================================================================== */

:root {
  /* Color */
  --paper: #ffffff;
  --paper-raised: #ffffff;
  --ink: #17241c;
  --ink-soft: #4b5d54;
  --ink-faint: #8a968f;
  --line: #dddddd;
  --brand-deep: #014225;
  --brand-olive: #556b2f;
  --brand-mint: #b9efd4;
  --accent-orange: #f79d5e;
  --export-color: #014225;
  --import-color: #f79d5e;
  --surplus: #556b2f;

  /* Type */
  --font-display: "Source Serif 4", "Noto Serif", Georgia, serif;
  --font-body: "Inter", "Be Vietnam Pro", -apple-system, sans-serif;
  --font-mono: "IBM Plex Mono", "SF Mono", Consolas, monospace;

  /* Layout */
  --radius: 4px;
  --shadow: 0 1px 2px rgba(1, 66, 37, 0.06), 0 1px 8px rgba(1, 66, 37, 0.05);
  --max-width: 1280px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.5;
}

.wrap { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }

/* ---------- Header / masthead ---------- */
.masthead {
  border-bottom: 2px solid var(--ink);
  background: var(--paper);
  position: sticky;
  top: 0;
  z-index: 40;
}
.masthead-brand-group {
  display: flex;
  align-items: center;
  gap: 14px;
}
.masthead-meta {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-faint);
  white-space: nowrap;
}
.masthead-brand {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--brand-deep);
  text-decoration: none;
  padding: 12px 4px;
}
.masthead-brand:hover { color: var(--accent-orange); }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- Tabs ---------- */
.tabs {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 0 24px;
  max-width: var(--max-width);
  margin: 0 auto;
  flex-wrap: wrap;
}
.tabs-left {
  display: flex;
  gap: 2px;
}
.tab-btn {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  background: transparent;
  border: none;
  border-bottom: 3px solid transparent;
  padding: 12px 18px;
  cursor: pointer;
  color: var(--ink-soft);
  transition: color 0.15s ease, border-color 0.15s ease;
}
.tab-btn:hover { color: var(--ink); }
.tab-btn.active {
  color: var(--brand-deep);
  border-bottom-color: var(--accent-orange);
  font-weight: 600;
}
.tab-btn[disabled] {
  color: var(--ink-faint);
  cursor: not-allowed;
}
.tab-btn .soon {
  font-size: 9px;
  background: var(--brand-mint);
  color: var(--brand-deep);
  padding: 1px 5px;
  border-radius: 2px;
  margin-left: 6px;
  letter-spacing: 0.02em;
}

.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ---------- Section ---------- */
/* ---------- Chart note (per-section analysis, SEO+GEO) ---------- */
.chart-note {
  margin: 16px 0 0;
  padding: 4px 0 4px 14px;
  border-left: 3px solid var(--brand-deep);
  font-family: var(--font-display);
  font-size: 15px;
  line-height: 1.55;
  color: var(--ink-soft);
  max-width: 780px;
}
.chart-note strong { color: var(--brand-deep); font-weight: 600; }

.section {
  padding: 32px 0;
  border-bottom: 1px solid var(--line);
}
.section:last-child { border-bottom: none; }
.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}
.section-title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  margin: 0;
  color: var(--brand-deep);
}
.section-sub {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-faint);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* ---------- Controls ---------- */
.controls { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }

.toggle-group {
  display: inline-flex;
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  overflow: hidden;
}
.toggle-group button {
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 7px 14px;
  border: none;
  background: var(--paper-raised);
  color: var(--ink-soft);
  cursor: pointer;
  border-right: 1px solid var(--ink);
}
.toggle-group button:last-child { border-right: none; }
.toggle-group button.active.export { background: var(--brand-olive); color: #fff; }
.toggle-group button.active.import { background: var(--accent-orange); color: #fff; }

select {
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 7px 10px;
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  background: var(--paper-raised);
  color: var(--ink);
}

/* ---------- Range slider (year-range controls) ---------- */
input[type=range] {
  -webkit-appearance: none;
  appearance: none;
  background: transparent;
  height: 20px;
  padding: 0;
  margin: 0;
  cursor: pointer;
}
input[type=range]::-webkit-slider-runnable-track {
  height: 4px;
  background: var(--brand-deep);
  border-radius: 2px;
}
input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  margin-top: -5px;
  border-radius: 50%;
  background: var(--brand-deep);
  border: 2px solid var(--paper);
  box-shadow: 0 0 0 1px var(--brand-deep);
}
input[type=range]::-moz-range-track {
  height: 4px;
  background: var(--brand-deep);
  border-radius: 2px;
}
input[type=range]::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--brand-deep);
  border: 2px solid var(--paper);
  box-shadow: 0 0 0 1px var(--brand-deep);
}

/* ---------- KPI cards ---------- */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1px;
  background: var(--ink);
  border: 1px solid var(--ink);
}
.kpi-card {
  background: var(--paper-raised);
  padding: 16px 18px;
}
.kpi-label {
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
  margin: 0 0 6px;
}
.kpi-value {
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 600;
  margin: 0;
  color: var(--brand-deep);
  font-variant-numeric: tabular-nums;
}
.kpi-value.export { color: var(--export-color); }
.kpi-value.import { color: var(--import-color); }
.kpi-sub {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-faint);
  margin: 4px 0 0;
}

/* ---------- Chart panel ---------- */
.panel {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
  box-shadow: var(--shadow);
}
.panel + .panel { margin-top: 16px; }
.chart-box { position: relative; width: 100%; }
.legend-row {
  display: flex;
  gap: 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-soft);
  margin-bottom: 10px;
}
.legend-row .dot {
  display: inline-block;
  width: 9px; height: 9px;
  border-radius: 1px;
  margin-right: 5px;
  vertical-align: middle;
}

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; align-items: stretch; }
.grid-2.stack-mobile { align-items: start; }
.grid-2 > .panel { display: flex; flex-direction: column; }
.grid-2 > .panel .chart-box { flex: 1 1 auto; }

.tooltip-line {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-soft);
  min-height: 16px;
  margin: 8px 0 0;
}

.footnote {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-faint);
  text-align: center;
  margin-top: 12px;
}

/* ---------- Heatmap table ---------- */
.heatmap-table {
  border-collapse: collapse;
  width: 100%;
  font-family: var(--font-mono);
  font-size: 11px;
}
.heatmap-table th {
  padding: 6px 8px;
  text-align: center;
  color: var(--ink-faint);
  font-weight: 500;
  white-space: nowrap;
}
.heatmap-table td {
  padding: 9px 8px;
  text-align: center;
  white-space: nowrap;
}
.heatmap-table td.hm-rowlabel {
  text-align: left;
  color: var(--ink-soft);
  font-family: var(--font-body);
  font-size: 12px;
  background: transparent !important;
}

/* ---------- Tab 2 placeholder ---------- */
.stub {
  padding: 64px 24px;
  text-align: center;
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  background: var(--paper-raised);
}
.stub-title {
  font-family: var(--font-display);
  font-size: 20px;
  color: var(--brand-deep);
  margin: 0 0 8px;
}
.stub p { color: var(--ink-soft); font-size: 13px; max-width: 480px; margin: 0 auto; }

/* ---------- Footer ---------- */
.site-footer {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-faint);
  text-align: center;
  padding: 24px;
}

/* ---------- Responsive ---------- */
@media (max-width: 760px) {
  html, body { font-size: 14px; }
  .wrap { padding: 0 14px; }
  .masthead-inner { flex-direction: column; align-items: flex-start; padding: 16px 14px 10px; gap: 4px; }
  .masthead-title { font-size: 20px; }
  .masthead-meta { text-align: left; font-size: 11px; }
  .tabs { padding: 0 14px; overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .tab-btn { padding: 10px 12px; font-size: 11px; white-space: nowrap; }

  .section { padding: 22px 0; }
  .section-head { flex-direction: column; align-items: flex-start; gap: 8px; }
  .section-title { font-size: 16px; }

  .controls { width: 100%; }
  .controls select, .toggle-group { flex: 1; }
  .toggle-group button { flex: 1; padding: 8px 10px; }

  .kpi-grid { grid-template-columns: repeat(2, 1fr); }
  .kpi-card { padding: 12px 14px; }
  .kpi-value { font-size: 20px; }

  .panel { padding: 14px 14px; }
  .grid-2 { grid-template-columns: 1fr; gap: 12px; }

  .chart-box { height: 220px !important; }
  #trendChart, #countryBarChart, #productBarChart { height: 100% !important; }

  .heatmap-table { font-size: 10px; }
  .heatmap-table td, .heatmap-table th { padding: 7px 6px; }

  #worldMap svg, #t2ProvinceMap svg { max-height: 320px; }

  .site-footer { padding: 18px 14px; font-size: 10px; }
}

@media (max-width: 420px) {
  .kpi-grid { grid-template-columns: 1fr 1fr; }
  .masthead-title small { font-size: 10px; }
  .masthead-title { font-size: 18px; }
}

/* Touch devices: tooltips rely on hover, so surface the value on tap too */
@media (hover: none) {
  .heatmap-table td[data-v] { cursor: pointer; }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}