/* Tethrd brand CSS - canonical reference: .claude/skills/tethrd-brand/SKILL.md */

@font-face {
  font-family: 'Duplet';
  font-weight: 300;
  font-style: normal;
  font-display: swap;
  src: url('/_shared/fonts/Duplet-Light.woff2') format('woff2'),
       url('/_shared/fonts/Duplet-Light.woff')  format('woff');
}
@font-face {
  font-family: 'Duplet';
  font-weight: 600;
  font-style: normal;
  font-display: swap;
  src: url('/_shared/fonts/Duplet-Semibold.woff2') format('woff2'),
       url('/_shared/fonts/Duplet-Semibold.woff')  format('woff');
}
@font-face {
  font-family: 'Roboto Serif';
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
  src: url('/_shared/fonts/Roboto-Serif-Variable.woff2') format('woff2-variations');
}

:root {
  --white: #FFFFFF;
  --black: #000000;
  --graphite: #6E7180;
  --space: #9DA2B3;
  --steel: #BCBFCC;
  --smoke: #D3D6E0;
  --cloud: #EDEFF7;

  --text-primary: var(--black);
  --text-secondary: var(--graphite);
  --text-muted: var(--space);
  --border: var(--steel);
  --border-soft: var(--smoke);
  --bg: var(--white);
  --bg-alt: var(--cloud);

  --surface-dark: #0A0A0B;
  --surface-dark-elevated: #1C1C1F;
  --surface-dark-border: #2A2A2E;

  --accent-positive: #10B981;
  --accent-positive-glow: rgba(16, 185, 129, 0.15);
  --accent-negative: #F87171;
  --accent-negative-glow: rgba(248, 113, 113, 0.12);

  --font-sans: 'Duplet', -apple-system, BlinkMacSystemFont, 'Inter', 'Segoe UI', sans-serif;
  --font-serif: 'Roboto Serif', 'Source Serif Pro', Georgia, serif;
  --font-mono: ui-monospace, 'SF Mono', 'Cascadia Mono', Menlo, monospace;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 16px;
  --space-4: 24px;
  --space-5: 32px;
  --space-6: 48px;
  --space-7: 72px;
  --space-8: 96px;

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.02);
  --shadow-card-hover: 0 4px 12px rgba(0, 0, 0, 0.08);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; -webkit-font-smoothing: antialiased; }
body {
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 300;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg);
}

h1, h2, h3, h4 {
  font-family: var(--font-sans);
  font-weight: 600;
  letter-spacing: -0.03em;
  color: var(--text-primary);
}
h1.serif, h2.serif, .display-title {
  font-family: var(--font-serif);
  font-weight: 500;
}
h1 { font-size: clamp(40px, 5vw, 48px); line-height: 1.1; }
h2 { font-size: clamp(28px, 3.5vw, 32px); line-height: 1.2; letter-spacing: -0.03em; }
h3 { font-size: clamp(22px, 2.5vw, 24px); letter-spacing: -0.02em; }
h4 { font-size: 18px; letter-spacing: -0.02em; }

p { color: var(--text-secondary); line-height: 1.7; font-weight: 300; }
strong { color: var(--text-primary); font-weight: 600; }
a { color: var(--black); text-decoration: underline; text-underline-offset: 3px; }
a:hover { color: var(--graphite); }

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: var(--space-6) var(--space-5);
}
.container-narrow { max-width: 760px; margin: 0 auto; padding: var(--space-6) var(--space-5); }

.metric-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-secondary);
}
.metric-value {
  font-family: var(--font-serif);
  font-size: 48px;
  font-weight: 500;
  letter-spacing: -0.03em;
  color: var(--text-primary);
}

.metric-card {
  background: var(--surface-dark);
  border: 1px solid var(--surface-dark-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  color: var(--white);
  position: relative;
  overflow: hidden;
}
.metric-card.positive::before {
  content: '';
  position: absolute;
  top: -20%; right: -10%;
  width: 60%; height: 140%;
  background: radial-gradient(ellipse at top right, var(--accent-positive-glow), transparent 60%);
  pointer-events: none;
}
.metric-card .metric-label { color: var(--space); margin-bottom: var(--space-3); }
.metric-card .metric-value { color: var(--white); font-size: 48px; line-height: 1; }
.metric-card.light {
  background: var(--white);
  border: 1px solid var(--smoke);
  color: var(--text-primary);
}
.metric-card.light .metric-value { color: var(--text-primary); }
.metric-card.light .metric-label { color: var(--text-secondary); }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: -0.01em;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.15s, transform 0.1s;
}
.btn-primary { background: var(--black); color: var(--white); }
.btn-primary:hover { background: #1C1C1F; color: var(--white); }
.btn-secondary { background: var(--cloud); color: var(--black); }
.btn-secondary:hover { background: var(--smoke); }

.pill {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}
.pill-positive { background: rgba(16, 185, 129, 0.12); color: var(--accent-positive); }
.pill-negative { background: rgba(248, 113, 113, 0.12); color: var(--accent-negative); }
.pill-neutral { background: var(--cloud); color: var(--text-secondary); }

.data-table {
  width: 100%;
  font-family: var(--font-sans);
  font-size: 14px;
  border-collapse: collapse;
}
.data-table th {
  text-align: left;
  padding: 12px 16px;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--smoke);
}
.data-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--cloud);
  color: var(--text-primary);
}
.data-table tr:hover td { background: var(--cloud); }
.data-table td.num { font-variant-numeric: tabular-nums; text-align: right; }

.site-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--smoke);
}
.site-nav .nav-logo { height: 24px; width: auto; }
.site-nav .nav-meta {
  font-size: 12px;
  color: var(--text-secondary);
  letter-spacing: 0.02em;
}

.site-footer {
  background: var(--surface-dark);
  color: var(--white);
  padding: var(--space-6) var(--space-5);
  text-align: center;
  margin-top: var(--space-8);
}
.site-footer .footer-logo { height: 20px; width: auto; margin-bottom: var(--space-3); }
.site-footer .footer-meta {
  font-size: 12px;
  color: var(--space);
  letter-spacing: 0.02em;
}

@media (max-width: 768px) {
  .container, .container-narrow { padding: var(--space-5) var(--space-4); }
}

@media print {
  * { print-color-adjust: exact; -webkit-print-color-adjust: exact; }
  body { background: white; }
  .page-break { page-break-before: always; }
  @page { margin: 15mm; size: A4; }
}