/* entropyx — Material Design 3 dark theme.
   One file. No framework. Tokens first, components second.
*/

/* ---------- Design tokens ---------- */
:root {
  /* M3 palette — teal-forward "instrument" key color on deep surface. */
  --md-primary:          #4DD0E1;
  --md-primary-dim:      #26C6DA;
  --md-on-primary:       #00363A;
  --md-surface:          #0C0E10;
  --md-surface-1:        #131619;
  --md-surface-2:        #1A1E22;
  --md-surface-3:        #22272C;
  --md-outline:          #2C3237;
  --md-outline-variant:  #1E2327;
  --md-on-surface:       #E6EAED;
  --md-on-surface-var:   #A8B1B8;
  --md-on-surface-dim:   #6E7880;
  --md-accent-warn:      #FFB74D;
  --md-accent-err:       #FF6E6E;

  /* M3 type scale — Roboto Flex tokens mapped to CSS sizes. */
  --type-display:        clamp(2.75rem, 6vw, 4rem);
  --type-headline:       clamp(1.75rem, 3vw, 2.25rem);
  --type-title:          1.25rem;
  --type-body:           1rem;
  --type-label:          0.8125rem;

  /* Shape. */
  --radius-xs:           6px;
  --radius-sm:           12px;
  --radius-md:           16px;
  --radius-lg:           24px;

  /* Elevation — M3 "surface tint" style rather than harsh shadow. */
  --elev-1:              0 1px 2px rgba(0,0,0,0.35);
  --elev-2:              0 2px 6px rgba(0,0,0,0.45);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--md-surface);
  color: var(--md-on-surface);
  font-family: "Roboto Flex", "Roboto", -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  font-weight: 400;
  line-height: 1.55;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

code, pre, .mono {
  font-family: "Roboto Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  font-feature-settings: "liga" 0;
}

a {
  color: var(--md-primary);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 120ms ease;
}
a:hover { border-bottom-color: var(--md-primary); }

/* ---------- Icons ---------- */
.material-symbols-outlined {
  font-family: "Material Symbols Outlined";
  font-weight: 300;
  font-style: normal;
  font-size: 24px;
  line-height: 1;
  letter-spacing: normal;
  text-transform: none;
  display: inline-block;
  white-space: nowrap;
  word-wrap: normal;
  direction: ltr;
  font-variation-settings:
    'FILL' 0,
    'wght' 300,
    'GRAD' 0,
    'opsz' 24;
  vertical-align: middle;
}

.octicon {
  fill: currentColor;
  vertical-align: middle;
}

/* ---------- Layout ---------- */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

section {
  padding: 96px 0;
  border-top: 1px solid var(--md-outline-variant);
}
section:first-of-type { border-top: none; padding-top: 48px; }

.section-eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.75rem;
  color: var(--md-on-surface-dim);
  margin: 0 0 12px 0;
  display: flex;
  align-items: center;
  gap: 8px;
}

h1, h2, h3 { font-weight: 500; margin: 0 0 16px 0; letter-spacing: -0.01em; }
h1 { font-size: var(--type-display); line-height: 1.1; font-weight: 600; }
h2 { font-size: var(--type-headline); line-height: 1.2; }
h3 { font-size: var(--type-title); }

p { margin: 0 0 16px 0; color: var(--md-on-surface-var); max-width: 68ch; }
p.lede { color: var(--md-on-surface); font-size: 1.125rem; max-width: 60ch; }

/* ---------- Top app bar ---------- */
.app-bar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(12,14,16,0.85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--md-outline-variant);
}
.app-bar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
  padding: 0 24px;
  max-width: 1100px;
  margin: 0 auto;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 1rem;
  color: var(--md-on-surface);
  border: none;
}
.brand .dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--md-primary);
  box-shadow: 0 0 12px rgba(77,208,225,0.6);
}
.nav-actions { display: flex; gap: 8px; align-items: center; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: 100px;
  font-weight: 500;
  font-size: 0.9375rem;
  cursor: pointer;
  border: none;
  transition: background 120ms ease, transform 80ms ease, border-color 120ms ease;
  font-family: inherit;
}
.btn:hover { border-bottom-color: transparent; }
.btn:active { transform: translateY(1px); }

.btn-filled {
  background: var(--md-primary);
  color: var(--md-on-primary);
}
.btn-filled:hover { background: var(--md-primary-dim); }

.btn-tonal {
  background: var(--md-surface-3);
  color: var(--md-on-surface);
}
.btn-tonal:hover { background: var(--md-surface-2); }

.btn-outlined {
  background: transparent;
  color: var(--md-on-surface);
  border: 1px solid var(--md-outline);
}
.btn-outlined:hover { border-color: var(--md-primary); color: var(--md-primary); }

.btn-text {
  background: transparent;
  color: var(--md-on-surface-var);
  padding: 8px 12px;
}
.btn-text:hover { color: var(--md-on-surface); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: 120px 0 72px 0;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 900px 400px at 20% 0%, rgba(77,208,225,0.08), transparent 60%),
    radial-gradient(ellipse 700px 500px at 80% 30%, rgba(77,208,225,0.05), transparent 70%);
  pointer-events: none;
  z-index: 0;
}
.hero > * { position: relative; z-index: 1; }

.hero h1 {
  background: linear-gradient(180deg, var(--md-on-surface) 0%, var(--md-on-surface-var) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero .tagline {
  font-size: 1.375rem;
  color: var(--md-on-surface);
  font-weight: 400;
  max-width: 42ch;
  margin-bottom: 32px;
}
.hero .sub {
  color: var(--md-on-surface-var);
  max-width: 60ch;
  margin-bottom: 40px;
}
.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; }

.chip-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 48px;
}
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: var(--md-surface-2);
  border: 1px solid var(--md-outline-variant);
  border-radius: 100px;
  font-size: var(--type-label);
  color: var(--md-on-surface-var);
}
.chip .material-symbols-outlined { font-size: 16px; color: var(--md-primary); }

/* ---------- Quote / story ---------- */
.dialog {
  display: grid;
  gap: 6px;
  margin: 24px 0 40px 0;
  padding: 24px;
  background: var(--md-surface-1);
  border-left: 3px solid var(--md-primary-dim);
  border-radius: var(--radius-sm);
  font-family: "Roboto Mono", monospace;
  font-size: 0.9375rem;
  color: var(--md-on-surface);
}
.dialog .line { display: flex; gap: 12px; }
.dialog .line .q::before { content: "› "; color: var(--md-primary); }
.dialog .line .a::before { content: "« "; color: var(--md-on-surface-dim); }

/* ---------- Grids ---------- */
.grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.card {
  background: var(--md-surface-1);
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: border-color 120ms ease, transform 120ms ease;
}
.card:hover { border-color: var(--md-outline); }

.card .card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px; height: 40px;
  border-radius: 10px;
  background: var(--md-surface-3);
  color: var(--md-primary);
  margin-bottom: 16px;
}
.card h3 { margin-bottom: 8px; color: var(--md-on-surface); }
.card p { font-size: 0.9375rem; margin: 0; }

/* ---------- Metric table (the 7 axes) ---------- */
.metric-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 32px;
}
.metric-table th,
.metric-table td {
  text-align: left;
  padding: 14px 16px;
  border-bottom: 1px solid var(--md-outline-variant);
  vertical-align: top;
}
.metric-table th {
  font-weight: 500;
  font-size: var(--type-label);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--md-on-surface-dim);
}
.metric-table td code {
  color: var(--md-primary);
  background: var(--md-surface-1);
  padding: 2px 8px;
  border-radius: var(--radius-xs);
  font-size: 0.8125rem;
}
.metric-table tr:hover td { background: var(--md-surface-1); }
.axis-name { color: var(--md-on-surface); font-weight: 500; }

/* ---------- Evidence cards (dogfooding) ---------- */
.evidence-card {
  background: var(--md-surface-1);
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.evidence-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.evidence-head .lang {
  font-size: var(--type-label);
  padding: 3px 10px;
  border-radius: 100px;
  background: var(--md-surface-3);
  color: var(--md-on-surface-var);
  font-family: "Roboto Mono", monospace;
}
.evidence-card h3 {
  font-family: "Roboto Mono", monospace;
  margin: 0;
  font-size: 1rem;
  color: var(--md-primary);
  font-weight: 500;
}
.stat-row {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  font-size: 0.875rem;
  color: var(--md-on-surface-dim);
}
.stat-row strong { color: var(--md-on-surface); font-weight: 500; }
.evidence-finding {
  color: var(--md-on-surface-var);
  font-size: 0.9375rem;
  padding-top: 8px;
  border-top: 1px solid var(--md-outline-variant);
}
.evidence-finding b { color: var(--md-on-surface); font-weight: 500; }

/* ---------- Quickstart ---------- */
pre.code {
  background: var(--md-surface-1);
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--radius-sm);
  padding: 20px 24px;
  overflow-x: auto;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--md-on-surface);
  margin: 16px 0;
}
pre.code .c { color: var(--md-on-surface-dim); }
pre.code .p { color: var(--md-primary); }
pre.code .s { color: var(--md-accent-warn); }

/* ---------- Footer ---------- */
footer {
  padding: 48px 0 64px 0;
  border-top: 1px solid var(--md-outline-variant);
  color: var(--md-on-surface-dim);
  font-size: 0.875rem;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}
.footer-links { display: flex; gap: 20px; flex-wrap: wrap; }
.footer-links a { color: var(--md-on-surface-var); border: none; }
.footer-links a:hover { color: var(--md-primary); }

/* ---------- Responsive polish ---------- */
@media (max-width: 640px) {
  section { padding: 64px 0; }
  .hero { padding: 72px 0 48px 0; }
  .app-bar-inner { padding: 0 16px; }
  .container { padding: 0 16px; }
  .metric-table th, .metric-table td { padding: 10px 8px; }
}