/* ============================================================
   INTO Social — shared chrome
   Tokens, base, topbar, page header, banner, footer, buttons.
   Page-specific styles stay inline in each wireframe.

   Token source of truth: ~/Sites/into-consulting-brand-system/tokens/into-consulting.theme.css
   ============================================================ */

:root,
[data-theme="warm-light"] {
  color-scheme: light;
  --into-surface-page: #fbfaf7;
  --into-surface-raised: #f4f1ea;
  --into-surface-muted: #ece8de;
  --into-surface-hover: #f0ece3;
  --into-text-primary: #1a1a1a;
  --into-text-secondary: #2e2e2e;
  --into-text-muted: #555555;
  --into-text-faint: #7a7a7a;
  --into-text-inverse: #fbfaf7;
  --into-line-soft: #c8c4b8;
  --into-line-strong: #b8b5ac;
  --into-accent: #1a4a4d;
  --into-accent-hover: #103436;
  --into-accent-soft: #e9efef;
  --into-accent-pastel: #d9eeee;
  --into-state-positive: #247a5a;
  --into-state-positive-soft: #dceee6;
  --into-state-warning: #ffc64f;
  --into-state-warning-soft: #fff1c7;
  --into-state-warning-ink: #6f4d00;
  --into-state-critical: #b94335;
  --into-state-critical-soft: #f4dedb;
  --into-shadow-hairline: 0 0 0 0.0625rem rgba(15, 21, 24, 0.08);
  --into-shadow-panel: 0 0.75rem 2rem rgba(15, 21, 24, 0.06);
}

[data-theme="blueprint-dark"] {
  color-scheme: dark;
  --into-surface-page: #0f1518;
  --into-surface-raised: #161d21;
  --into-surface-muted: #1e272b;
  --into-surface-hover: #1b2429;
  --into-text-primary: #eceef0;
  --into-text-secondary: #c8ced4;
  --into-text-muted: #98a2ac;
  --into-text-faint: #6a7480;
  --into-text-inverse: #0f1518;
  --into-line-soft: #2b353c;
  --into-line-strong: #3d4953;
  --into-accent: #4fb5b8;
  --into-accent-hover: #6bc8cc;
  --into-accent-soft: #1f2a2e;
  --into-accent-pastel: #a8e5e7;
  --into-state-positive: #75c6a7;
  --into-state-positive-soft: #17342d;
  --into-state-warning: #ffc64f;
  --into-state-warning-soft: #3b311a;
  --into-state-warning-ink: #ffd978;
  --into-state-critical: #ee7a70;
  --into-state-critical-soft: #3b2423;
  --into-shadow-hairline: 0 0 0 0.0625rem rgba(236, 238, 240, 0.10);
  --into-shadow-panel: 0 0.75rem 2rem rgba(0, 0, 0, 0.32);
}

:root {
  --into-font-serif: "Newsreader", Georgia, serif;
  --into-font-sans: "Lexend", system-ui, sans-serif;
  --into-font-mono: "IBM Plex Mono", ui-monospace, monospace;
  --into-content-max: 80rem;
  --into-reading-max: 60rem;
  --into-radius-card: 0.375rem;
  --into-radius-panel: 0.625rem;
  --into-radius-pill: 999rem;
}

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--into-font-sans);
  font-weight: 400;
  font-size: 1rem;
  line-height: 1.55;
  color: var(--into-text-primary);
  background: var(--into-surface-page);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a { color: var(--into-accent); text-decoration: none; }
a:hover { color: var(--into-accent-hover); text-decoration: underline; text-underline-offset: 0.2em; }
button { font: inherit; cursor: pointer; }

/* ---------- Topbar ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--into-surface-page) 86%, transparent);
  backdrop-filter: blur(1rem);
  -webkit-backdrop-filter: blur(1rem);
  border-bottom: 1px solid var(--into-line-soft);
}
.topbar-inner {
  max-width: var(--into-content-max);
  margin: 0 auto;
  padding: 0.875rem 2rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

/* INTO mark + wordmark */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  color: var(--into-text-primary);
  font-weight: 500;
  font-size: 0.9375rem;
  letter-spacing: 0.005em;
}
.brand:hover { text-decoration: none; color: var(--into-text-primary); }
.brand-mark {
  width: 1.5rem;
  height: 1.5rem;
  color: var(--into-text-primary);
  display: inline-block;
  flex-shrink: 0;
}
.brand-mark svg { width: 100%; height: 100%; display: block; }
.brand-name {
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-size: 0.8125rem;
  font-weight: 500;
}
.brand-divider {
  width: 1px;
  height: 0.875rem;
  background: var(--into-line-strong);
  display: inline-block;
  margin: 0 0.0625rem;
}
.brand-product {
  color: var(--into-text-secondary);
  font-weight: 400;
  font-size: 0.875rem;
  letter-spacing: 0.005em;
  font-family: var(--into-font-serif);
  font-style: italic;
}

.surface-nav {
  display: inline-flex;
  gap: 0.125rem;
  margin: 0 auto 0 0;
  padding-left: 1.5rem;
  align-items: center;
}
.surface-nav a {
  padding: 0.4375rem 0.75rem;
  font-size: 0.8125rem;
  color: var(--into-text-secondary);
  border-radius: var(--into-radius-card);
  text-decoration: none;
  transition: background 180ms ease, color 180ms ease;
}
.surface-nav a:hover { background: var(--into-surface-hover); color: var(--into-text-primary); text-decoration: none; }
.surface-nav a[aria-current="page"] { color: var(--into-accent); background: var(--into-accent-soft); }

.topbar-actions { display: inline-flex; gap: 0.5rem; align-items: center; }
.icon-btn {
  width: 2.25rem;
  height: 2.25rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid var(--into-line-soft);
  color: var(--into-text-secondary);
  border-radius: var(--into-radius-card);
  transition: background 180ms ease, border-color 180ms ease, color 180ms ease;
}
.icon-btn:hover { background: var(--into-surface-hover); border-color: var(--into-line-strong); color: var(--into-text-primary); }
.icon-btn svg { width: 1.0625rem; height: 1.0625rem; }
[data-theme="warm-light"] .icon-btn .icon-dark,
[data-theme="blueprint-dark"] .icon-btn .icon-light { display: none; }

.avatar {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 999rem;
  background: var(--into-accent-soft);
  color: var(--into-accent);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8125rem;
  font-weight: 500;
}

/* ---------- Page wrapper + header ---------- */
.page {
  max-width: var(--into-content-max);
  margin: 0 auto;
  padding: 3rem 2rem 5rem;
}
.page--reading {
  max-width: var(--into-reading-max);
  padding-top: 4rem;
}

.page-header { margin-bottom: 2.5rem; max-width: 64rem; }
.page--reading .page-header { margin-bottom: 3rem; }
.kicker {
  font-family: var(--into-font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--into-text-muted);
  margin: 0 0 1rem;
}
.page-title {
  font-family: var(--into-font-serif);
  font-weight: 500;
  font-size: clamp(2.25rem, 4vw, 3rem);
  line-height: 1.08;
  letter-spacing: -0.005em;
  margin: 0 0 1.25rem;
  color: var(--into-text-primary);
}
.lead {
  font-family: var(--into-font-serif);
  font-weight: 400;
  font-size: 1.1875rem;
  line-height: 1.55;
  color: var(--into-text-secondary);
  max-width: 44rem;
  margin: 0 0 2rem;
}

/* ---------- Meta strip ---------- */
.meta-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
  border-top: 1px solid var(--into-line-soft);
  border-bottom: 1px solid var(--into-line-soft);
  padding: 1rem 0;
}
.meta-strip > div { padding: 0 1.25rem; border-left: 1px solid var(--into-line-soft); }
.meta-strip > div:first-child { border-left: none; padding-left: 0; }
.meta-label {
  display: block;
  font-family: var(--into-font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--into-text-muted);
  margin-bottom: 0.375rem;
}
.meta-value {
  display: block;
  font-family: var(--into-font-serif);
  font-weight: 500;
  font-size: 1.5rem;
  line-height: 1.1;
  color: var(--into-text-primary);
}
.meta-trend {
  font-family: var(--into-font-sans);
  font-size: 0.75rem;
  color: var(--into-text-faint);
  margin-left: 0.375rem;
}

/* ---------- Section head ---------- */
.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin: 0 0 1rem;
  gap: 1rem;
}
.section-title {
  font-family: var(--into-font-serif);
  font-weight: 500;
  font-size: 1.375rem;
  line-height: 1.2;
  color: var(--into-text-primary);
  margin: 0;
}
.section-meta { font-size: 0.8125rem; color: var(--into-text-muted); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4375rem;
  padding: 0.5rem 0.9375rem;
  font-size: 0.8125rem;
  font-weight: 500;
  border-radius: var(--into-radius-card);
  border: 1px solid transparent;
  background: transparent;
  color: var(--into-text-secondary);
  transition: background 180ms ease, color 180ms ease, border-color 180ms ease;
}
.btn:hover { background: var(--into-surface-hover); color: var(--into-text-primary); }
.btn-primary { background: var(--into-accent); color: var(--into-text-inverse); }
.btn-primary:hover { background: var(--into-accent-hover); color: var(--into-text-inverse); }
.btn-secondary { border-color: var(--into-line-soft); color: var(--into-text-secondary); }
.btn-secondary:hover { border-color: var(--into-line-strong); background: var(--into-surface-hover); }
.btn-quiet { color: var(--into-text-muted); }
.btn-quiet:hover { color: var(--into-text-primary); }

/* ---------- Wireframe banner + footer ---------- */
.wireframe-banner {
  max-width: var(--into-content-max);
  margin: 1.25rem auto 0;
  padding: 0.625rem 1rem;
  background: var(--into-state-warning-soft);
  color: var(--into-state-warning-ink);
  border: 1px solid var(--into-state-warning);
  border-radius: var(--into-radius-card);
  font-family: var(--into-font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.footnote {
  max-width: var(--into-content-max);
  margin: 0 auto;
  padding: 2rem 2rem 4rem;
  border-top: 1px solid var(--into-line-soft);
  color: var(--into-text-faint);
  font-size: 0.75rem;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}
.footnote a { color: var(--into-text-muted); }

/* ---------- Responsive ---------- */
@media (max-width: 62rem) {
  .surface-nav { display: none; }
}
@media (max-width: 48rem) {
  .topbar-inner { padding: 0.75rem 1.25rem; gap: 0.75rem; }
  .brand-divider, .brand-product { display: none; }
  .page { padding: 2rem 1.25rem 3rem; }
  .meta-strip { grid-template-columns: repeat(2, 1fr); row-gap: 1rem; }
  .meta-strip > div:nth-child(3) { border-left: none; padding-left: 0; }
  .wireframe-banner { margin: 0.875rem 1.25rem 0; }
  .footnote { padding: 1.5rem 1.25rem 3rem; }
}
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}