/* Atlas Market Gauge — editorial design system (no build step required). */

:root {
  --radius: 0.25rem;
  --background: oklch(0.955 0.012 85);
  --foreground: oklch(0.205 0.008 45);
  --card: oklch(0.982 0.008 85);
  --primary: oklch(0.47 0.145 41);
  --secondary: oklch(0.915 0.014 85);
  --muted-foreground: oklch(0.49 0.012 50);
  --border: oklch(0.865 0.014 80);

  --heat-frozen: oklch(0.62 0.11 245);
  --heat-cold: oklch(0.68 0.08 215);
  --heat-mild: oklch(0.63 0.1 155);
  --heat-warm: oklch(0.75 0.12 85);
  --heat-hot: oklch(0.66 0.15 55);
  --heat-boiling: oklch(0.52 0.19 27);

  --font-serif: "Source Serif 4", ui-serif, Georgia, serif;
  --font-sans: "IBM Plex Sans", ui-sans-serif, system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;

  --maxw: 1120px;
}

* { box-sizing: border-box; border-color: var(--border); }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--background);
  color: var(--foreground);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 { font-family: var(--font-serif); font-weight: 600; letter-spacing: -0.01em; margin: 0; }
h1 { font-size: 2.25rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.125rem; }
p { margin: 0; }
a { color: inherit; }
ul, ol { margin: 0; }
strong { font-weight: 500; }
code { font-family: var(--font-mono); font-size: 0.85em; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 1.25rem; }
.muted { color: var(--muted-foreground); }
.tabular { font-variant-numeric: tabular-nums; }
.mono { font-family: var(--font-mono); }
.stack > * + * { margin-top: 0.75rem; }

.label-caps {
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted-foreground);
}

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 40;
  border-bottom: 1px solid var(--border);
  background: color-mix(in oklab, var(--background) 90%, transparent);
  backdrop-filter: blur(6px);
}
.site-header .wrap {
  display: flex; flex-wrap: wrap; align-items: center;
  gap: 0.5rem 2rem; padding-top: 0.75rem; padding-bottom: 0.75rem;
}
.brand { display: flex; align-items: baseline; gap: 0.5rem; text-decoration: none; }
.brand-atlas { font-family: var(--font-serif); font-size: 1.125rem; font-weight: 700; letter-spacing: 0.16em; text-transform: uppercase; }
.brand-sub { font-family: var(--font-serif); font-size: 1.125rem; color: var(--muted-foreground); }
.site-nav { display: flex; gap: 1.25rem; }
.site-nav a { font-size: 0.875rem; color: var(--muted-foreground); text-decoration: none; }
.site-nav a:hover { color: var(--primary); }
.site-nav a[aria-current="page"] { color: var(--foreground); font-weight: 500; }
.header-meta { margin-left: auto; display: flex; flex-direction: column; gap: 0.125rem; }
@media (min-width: 640px) { .header-meta { align-items: flex-end; } }
.header-meta .ts { font-size: 0.75rem; color: var(--muted-foreground); font-variant-numeric: tabular-nums; }

/* ---------- feed status ---------- */
.feed-banner {
  border: 1px solid var(--border);
  background: var(--card);
  border-radius: var(--radius);
  padding: 0.65rem 1rem;
  font-size: 0.8125rem;
  margin-top: 1.25rem;
  display: flex; flex-wrap: wrap; gap: 0.5rem 1rem; align-items: baseline;
}
.tag {
  font-size: 0.625rem; letter-spacing: 0.1em; text-transform: uppercase;
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 0.05rem 0.35rem; color: var(--muted-foreground);
}
.tag-live { color: var(--primary); border-color: color-mix(in oklab, var(--primary) 45%, transparent); }

/* ---------- sections ---------- */
main { padding-bottom: 1rem; }
section { padding: 3rem 0; }
.hero { border-bottom: 1px solid var(--border); display: grid; gap: 2.5rem; }
@media (min-width: 1024px) {
  .hero { grid-template-columns: minmax(0, 380px) minmax(0, 1fr); gap: 3.5rem; }
}
.section-head { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 0.75rem; }
.rule-top { border-top: 1px solid var(--border); }

/* ---------- hero score ---------- */
.heat-score .score-row { display: flex; align-items: flex-end; gap: 1rem; margin-top: 0.75rem; }
.heat-number { font-size: 5.5rem; line-height: 0.85; font-weight: 600; font-variant-numeric: tabular-nums; }
.heat-chip {
  display: inline-flex; align-items: center; gap: 0.5rem;
  border: 1px solid var(--border); background: var(--card);
  border-radius: var(--radius); padding: 0.25rem 0.75rem; margin-bottom: 0.5rem;
}
.heat-chip .dot { width: 0.625rem; height: 0.625rem; border-radius: 999px; }
.heat-chip .word { font-family: var(--font-serif); font-size: 1.25rem; }
.dot-frozen { background: var(--heat-frozen); }
.dot-cold { background: var(--heat-cold); }
.dot-mild { background: var(--heat-mild); }
.dot-warm { background: var(--heat-warm); }
.dot-hot { background: var(--heat-hot); }
.dot-boiling { background: var(--heat-boiling); }

.thermometer { display: flex; height: 0.75rem; width: 100%; overflow: hidden; border-radius: var(--radius); }
.thermometer span { display: block; }
.thermo-marker { position: relative; height: 1.25rem; }
.thermo-marker > div { position: absolute; top: 0; transform: translateX(-50%); text-align: center; }
.thermo-marker .tick { width: 2px; height: 0.5rem; background: var(--foreground); margin: 0 auto; }
.thermo-marker .val { font-size: 11px; font-variant-numeric: tabular-nums; }
.thermo-scale { display: flex; justify-content: space-between; font-size: 11px; color: var(--muted-foreground); margin-top: 0.25rem; }
.calc-link {
  display: inline-block; margin-top: 1rem; font-size: 0.875rem;
  color: var(--primary); text-decoration: none;
  border-bottom: 1px solid color-mix(in oklab, var(--primary) 40%, transparent); padding-bottom: 2px;
}

/* ---------- chart wells ---------- */
.chart-placeholder {
  position: relative;
  display: flex; align-items: center; justify-content: center;
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  background: color-mix(in oklab, var(--card) 60%, transparent);
  overflow: hidden;
  width: 100%;
}
.chart-placeholder svg { position: absolute; inset: 0; width: 100%; height: 100%; opacity: 0.3; color: var(--muted-foreground); }
.chart-placeholder .cap {
  position: relative; z-index: 1;
  background: color-mix(in oklab, var(--background) 70%, transparent);
  padding: 0.1rem 0.5rem;
}

/* ---------- component bars ---------- */
.component-list { list-style: none; padding: 0; margin-top: 1.5rem; }
.component-list li {
  display: grid; gap: 0.5rem;
  border-bottom: 1px solid color-mix(in oklab, var(--border) 70%, transparent);
  padding-bottom: 1.25rem; margin-bottom: 1.25rem;
}
@media (min-width: 640px) {
  .component-list li { grid-template-columns: minmax(0, 260px) minmax(0, 1fr) 72px; align-items: center; gap: 1.5rem; }
  .component-list .score { text-align: right; }
}
.component-list .name { font-weight: 500; }
.bar-track { height: 0.625rem; width: 100%; border-radius: var(--radius); background: var(--secondary); }
.bar-fill { height: 100%; border-radius: var(--radius); background: var(--primary); }
.component-list .score { font-size: 1.25rem; font-variant-numeric: tabular-nums; }
.small { font-size: 0.75rem; color: var(--muted-foreground); }

.fragility {
  margin-top: 1.5rem; display: flex; flex-wrap: wrap; align-items: center; gap: 0.75rem;
  border: 1px solid var(--border); background: var(--card);
  border-radius: var(--radius); padding: 0.75rem 1rem; font-size: 0.875rem;
}

/* ---------- metric cards ---------- */
.card-grid { display: grid; gap: 1.25rem; margin-top: 1.5rem; }
@media (min-width: 640px) { .card-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 1024px) { .card-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
.metric-card {
  display: flex; flex-direction: column; text-decoration: none;
  border: 1px solid var(--border); background: var(--card);
  border-radius: var(--radius); padding: 1.25rem;
  transition: border-color 0.15s ease;
}
.metric-card:hover { border-color: color-mix(in oklab, var(--primary) 60%, transparent); }
.metric-card:hover h3 { color: var(--primary); }
.metric-card .head { display: flex; align-items: baseline; justify-content: space-between; gap: 0.5rem; }
.metric-card h3 { font-size: 1rem; }
.metric-card .value { font-size: 1.875rem; font-variant-numeric: tabular-nums; margin-top: 0.75rem; }

/* ---------- sessions ---------- */
.session-grid { display: grid; gap: 1.5rem; margin-top: 1.5rem; }
@media (min-width: 768px) { .session-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
.session-col { border-top: 2px solid color-mix(in oklab, var(--foreground) 80%, transparent); padding-top: 1rem; }

/* ---------- methodology ---------- */
.methodology-layout { display: grid; gap: 3rem; margin-top: 3rem; }
@media (min-width: 1024px) {
  .methodology-layout { grid-template-columns: 220px minmax(0, 1fr); }
  .toc { position: sticky; top: 6rem; height: max-content; }
}
.toc { border-left: 1px solid var(--border); padding-left: 1rem; }
.toc ol { list-style: none; padding: 0; margin-top: 0.75rem; }
.toc li + li { margin-top: 0.5rem; }
.toc a { font-size: 0.875rem; color: var(--muted-foreground); text-decoration: none; }
.toc a:hover { color: var(--primary); }
.methodology-article { max-width: 68ch; font-size: 0.975rem; line-height: 1.75; }
.methodology-article section { padding: 0; scroll-margin-top: 7rem; }
.methodology-article section + section { margin-top: 3rem; }
.methodology-article h2 { margin-bottom: 0.75rem; }
.methodology-article p + p { margin-top: 0.75rem; }
.callout { border: 1px solid var(--border); background: var(--card); border-radius: var(--radius); padding: 1.25rem; margin-top: 0.75rem; }
.callout .formula { font-family: var(--font-mono); font-size: 0.875rem; margin-top: 0.5rem; }
table { width: 100%; border-collapse: collapse; font-size: 0.875rem; }
thead tr { border-bottom: 1px solid var(--border); text-align: left; }
th { padding: 0.5rem 1rem 0.5rem 0; }
td { padding: 0.75rem 1rem 0.75rem 0; vertical-align: top; border-bottom: 1px solid color-mix(in oklab, var(--border) 60%, transparent); }
.table-scroll { overflow-x: auto; }

/* ---------- footer ---------- */
.site-footer { margin-top: 5rem; border-top: 1px solid var(--border); }
.site-footer .wrap { padding-top: 2.5rem; padding-bottom: 2.5rem; font-size: 0.875rem; color: var(--muted-foreground); }
.site-footer .lede { font-family: var(--font-serif); font-size: 1rem; color: var(--foreground); }
.site-footer .meta { display: flex; flex-wrap: wrap; gap: 0.25rem 1rem; font-size: 0.75rem; }