/* Shared tokens, layout and navigation for the A/B test dashboards.
   Light by default, dark through prefers-color-scheme, with a [data-theme] override. */

:root {
  color-scheme: light dark;

  --font-anthropic-sans: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-anthropic-serif: "Source Serif 4", "Iowan Old Style", "Palatino Linotype", Georgia, serif;

  /* surfaces and text */
  --color-bg: #f6f4ee;
  --color-panel: #ffffff;
  --color-fg: #1c2024;
  --color-fg-muted: #5a6068;
  --color-border-line: #e0ddd3;
  --color-accent: #2556a3;
  --color-ok: #1c7447;
  --color-warn: #8f5f00;
  --color-bad: #b02a22;

  /* chart tokens */
  --cds-border: #d3cfc3;
  --cds-surface-popover: #ffffff;
  --cds-shadow-popover: 0 6px 20px rgba(28, 32, 36, 0.14);
  --cds-text-secondary: #5a6068;
  --cds-chart-grid: #e9e6dd;
  --cds-chart-axis: #8d939a;
  --cds-chart-reference: #7c828a;
  --cds-chart-muted: #8f959d;
  --cds-chart-1: #2556a3;
  --cds-chart-2: #c4651b;
  --cds-chart-3: #14808a;
  --cds-chart-4: #7a4fa3;
  --cds-chart-5: #b08a10;
  --cds-chart-6: #b3436b;
  --cds-chart-7: #4d8a2e;
  --cds-chart-8: #5f6b7a;
  --skeleton: #ece9e0;

  /* type scale, spacing, motion */
  --cds-font-size-caption: 0.8125rem;
  --cds-font-size-body: 0.9375rem;
  --cds-font-size-heading: 1.125rem;
  --cds-font-size-title: 1.25rem;
  --cds-font-weight-medium: 500;
  --cds-gap-sm: 0.5rem;
  --cds-gap-md: 1rem;
  --cds-gap-lg: 1.5rem;
  --cds-pad-xs: 0.375rem;
  --cds-pad-sm: 0.625rem;
  --cds-pad-md: 1rem;
  --cds-pad-lg: 1.25rem;
  --cds-pad-xl: 2rem;
  --cds-radius: 8px;
  --cds-dur-slow: 400ms;
  --cds-ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

:root[data-theme="light"] { color-scheme: light; }

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg: #121416;
    --color-panel: #1a1d20;
    --color-fg: #ebe9e4;
    --color-fg-muted: #a3a9b0;
    --color-border-line: #2c3136;
    --color-accent: #82b2ee;
    --color-ok: #62c58f;
    --color-warn: #e2b44f;
    --color-bad: #f28b82;

    --cds-border: #3a4046;
    --cds-surface-popover: #23272b;
    --cds-shadow-popover: 0 6px 22px rgba(0, 0, 0, 0.55);
    --cds-text-secondary: #a3a9b0;
    --cds-chart-grid: #2a2e33;
    --cds-chart-axis: #8a9097;
    --cds-chart-reference: #8f959c;
    --cds-chart-muted: #7d848c;
    --cds-chart-1: #82b2ee;
    --cds-chart-2: #eba368;
    --cds-chart-3: #55c2cc;
    --cds-chart-4: #b995dd;
    --cds-chart-5: #e0c04f;
    --cds-chart-6: #e585a6;
    --cds-chart-7: #8fcb6e;
    --cds-chart-8: #a5b0be;
    --skeleton: #23272b;
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --color-bg: #121416;
  --color-panel: #1a1d20;
  --color-fg: #ebe9e4;
  --color-fg-muted: #a3a9b0;
  --color-border-line: #2c3136;
  --color-accent: #82b2ee;
  --color-ok: #62c58f;
  --color-warn: #e2b44f;
  --color-bad: #f28b82;

  --cds-border: #3a4046;
  --cds-surface-popover: #23272b;
  --cds-shadow-popover: 0 6px 22px rgba(0, 0, 0, 0.55);
  --cds-text-secondary: #a3a9b0;
  --cds-chart-grid: #2a2e33;
  --cds-chart-axis: #8a9097;
  --cds-chart-reference: #8f959c;
  --cds-chart-muted: #7d848c;
  --cds-chart-1: #82b2ee;
  --cds-chart-2: #eba368;
  --cds-chart-3: #55c2cc;
  --cds-chart-4: #b995dd;
  --cds-chart-5: #e0c04f;
  --cds-chart-6: #e585a6;
  --cds-chart-7: #8fcb6e;
  --cds-chart-8: #a5b0be;
  --skeleton: #23272b;
}

/* base */
*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-fg);
  font-family: var(--font-anthropic-sans);
  font-size: 1rem;
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: var(--color-accent); text-underline-offset: 0.18em; }
a:hover { text-decoration-thickness: 2px; }

:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; }

/* header and navigation */
.site-header { border-bottom: 1px solid var(--color-border-line); }

.site-header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0.5rem 16px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0 1.5rem;
}

.site-brand {
  font-family: var(--font-anthropic-serif);
  font-size: 1.125rem;
  color: var(--color-fg);
  text-decoration: none;
  padding: 0.5rem 0;
  margin-right: 0.5rem;
  white-space: nowrap;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0 1.25rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-nav a {
  display: inline-block;
  padding: 0.55rem 0 0.4rem;
  border-bottom: 2px solid transparent;
  color: var(--color-fg-muted);
  text-decoration: none;
  font-size: var(--cds-font-size-body);
}

.site-nav a:hover { color: var(--color-fg); }
.site-nav a[aria-current="page"] { color: var(--color-fg); border-bottom-color: var(--color-accent); }

.site-nav-ext { margin-left: auto; }
.site-nav-ext a { font-size: var(--cds-font-size-caption); }
.site-nav-ext a::after { content: "\2197"; margin-left: 0.2em; font-size: 0.9em; }

/* page frame */
.site-main {
  flex: 1 0 auto;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.5rem 16px 3rem;
  min-width: 0;
}

#dash-root { min-width: 0; }
#dash-root .ab { max-width: none; }
#dash-root button:focus-visible,
#dash-root input:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; }
#dash-root input[type="range"] { accent-color: var(--color-accent); }

/* footer */
.site-footer { border-top: 1px solid var(--color-border-line); color: var(--color-fg-muted); font-size: var(--cds-font-size-caption); }
.site-footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.5rem;
  justify-content: space-between;
}
.site-footer p { margin: 0; }

/* loading placeholder used by chart boxes while data is in flight */
.dash-skeleton { background: var(--skeleton); }
@media (prefers-reduced-motion: no-preference) {
  .dash-skeleton { animation: dash-pulse 1.4s ease-in-out infinite; }
}
@keyframes dash-pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.55; } }

.site-noscript, .site-error {
  border: 1px solid var(--color-border-line);
  border-radius: var(--cds-radius);
  background: var(--color-panel);
  padding: 1rem 1.25rem;
  color: var(--color-fg-muted);
}

/* landing page */
.landing-hero { max-width: 46rem; margin-bottom: 2rem; }
.landing-hero h1 {
  font-family: var(--font-anthropic-serif);
  font-weight: 400;
  font-size: clamp(1.9rem, 5vw, 2.75rem);
  line-height: 1.12;
  letter-spacing: -0.01em;
  margin: 0 0 0.75rem;
}
.landing-hero p { margin: 0 0 0.5rem; color: var(--color-fg-muted); font-size: 1.0625rem; }

.landing-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 22rem), 1fr));
  gap: 1rem;
}

.landing-card {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  background: var(--color-panel);
  border: 1px solid var(--color-border-line);
  border-radius: var(--cds-radius);
  padding: 1.25rem;
  color: var(--color-fg);
  text-decoration: none;
  min-width: 0;
  transition: border-color 160ms ease, transform 160ms ease;
}
.landing-card:hover { border-color: var(--color-accent); }
@media (prefers-reduced-motion: no-preference) { .landing-card:hover { transform: translateY(-2px); } }

.landing-card h2 {
  font-family: var(--font-anthropic-serif);
  font-weight: 400;
  font-size: 1.5rem;
  line-height: 1.2;
  margin: 0;
}
.landing-card p { margin: 0; color: var(--color-fg-muted); font-size: var(--cds-font-size-body); }

.landing-kpis {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(7.5rem, 1fr));
  gap: 0.75rem 1rem;
  margin: 0.25rem 0 0;
  padding: 0.9rem 0 0;
  border-top: 1px solid var(--color-border-line);
}
.landing-kpis div { min-width: 0; }
.landing-kpis dt { font-size: var(--cds-font-size-caption); color: var(--color-fg-muted); }
.landing-kpis dd {
  margin: 0;
  font-family: var(--font-anthropic-serif);
  font-size: 1.5rem;
  line-height: 1.25;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
.landing-kpis dd.up { color: var(--color-ok); }
.landing-kpis dd.down { color: var(--color-bad); }

.landing-open { margin-top: auto; color: var(--color-accent); font-size: var(--cds-font-size-body); }
.landing-open::after { content: " \2192"; }

.landing-links { margin-top: 2rem; display: flex; flex-wrap: wrap; gap: 0.5rem 1.5rem; font-size: var(--cds-font-size-body); }
.landing-links a::after { content: "\2197"; margin-left: 0.2em; font-size: 0.9em; }

@media (min-width: 720px) {
  .site-header-inner, .site-footer-inner { padding-left: 24px; padding-right: 24px; }
  .site-main { padding-left: 24px; padding-right: 24px; padding-top: 2rem; }
}

@media (max-width: 560px) {
  .site-nav-ext { margin-left: 0; }
}