/* ─────────────────────────────────────────────────────────────────────
   ndn-rs wiki — IBM Carbon theme
   Maps the dashboard's Carbon design tokens (crates/tooling/ndn-dashboard/
   src/styles.rs) onto mdBook's `navy` (dark, the configured default) and
   `light` themes, so the docs and the dashboard read as one product.

   Doctrine: Carbon FOUNDATIONS (Plex type, token colour, 2x spacing,
   square corners) applied at EDITORIAL density — wide reading measure,
   generous line-height — not the dashboard's data density.

   Loaded after fonts.css (see book.toml `additional-css`).
   ───────────────────────────────────────────────────────────────────── */

/* ── Carbon tokens ──────────────────────────────────────────────────────
   NOTE: mdBook sets `:root { font-size: 62.5% }`, so in this book 1rem =
   10px. All rem values below are authored in that 10px base (e.g. 1.6rem =
   16px). Keep that in mind when editing — a value that looks like "1rem"
   here is 10px, not 16px. --content-max-width is left in px to avoid the
   ambiguity entirely. */
:root {
  /* spacing — Carbon 2x grid (px shown in comments) */
  --cds-1: 0.2rem;  --cds-2: 0.4rem;  --cds-3: 0.8rem;  --cds-4: 1.2rem; /* 2 4 8 12 */
  --cds-5: 1.6rem;  --cds-6: 2.4rem;  --cds-7: 3.2rem;  --cds-8: 4rem;   /* 16 24 32 40 */
  --cds-9: 4.8rem;  --cds-10: 6.4rem;                                    /* 48 64 */

  --font-sans: 'IBM Plex Sans','IBM Plex Sans Var',system-ui,-apple-system,'Segoe UI',Roboto,sans-serif;
  --font-mono: 'IBM Plex Mono','SF Mono',ui-monospace,SFMono-Regular,Consolas,monospace;

  /* editorial reading measure — wider than mdBook's 750px default */
  --content-max-width: 960px;
}

/* dark — mapped from styles.rs :root (Carbon Gray 100 base) */
.navy, .coal {
  --cds-bg:#161616; --cds-layer:#262626; --cds-layer2:#393939;
  --cds-border:#525252; --cds-border-subtle:#393939;
  --cds-text:#f4f4f4; --cds-text-muted:#a8a8a8; --cds-text-faint:#6f6f6f;
  --cds-link:#78a9ff; --cds-interactive:#4589ff; --cds-selected:#001d6c;
  --cds-success:#42be65; --cds-success-bg:#022d0d;
  --cds-warning:#f1c21b; --cds-warning-bg:#302400;
  --cds-error:#fa4d56;   --cds-error-bg:#3a0b0d;
  --cds-info:#78a9ff;    --cds-info-bg:#001d6c;
  --cds-ext:#be95ff;     --cds-ext-bg:#1f1144;   /* non-standard marker */
}

/* light — mapped from styles.rs .light-mode (Carbon White base) */
.light, .rust, .ayu {
  --cds-bg:#ffffff; --cds-layer:#f4f4f4; --cds-layer2:#e0e0e0;
  --cds-border:#c6c6c6; --cds-border-subtle:#e0e0e0;
  --cds-text:#161616; --cds-text-muted:#525252; --cds-text-faint:#8d8d8d;
  --cds-link:#0f62fe; --cds-interactive:#0f62fe; --cds-selected:#d0e2ff;
  --cds-success:#24a148; --cds-success-bg:#defbe6;
  --cds-warning:#b28600; --cds-warning-bg:#fcf4d6;
  --cds-error:#da1e28;   --cds-error-bg:#fff1f1;
  --cds-info:#0f62fe;    --cds-info-bg:#d0e2ff;
  --cds-ext:#8a3ffc;     --cds-ext-bg:#f6f2ff;
}

/* ── Bind mdBook's own variables to Carbon tokens ──────────────────────
   Overriding mdBook's variable names re-skins chrome (sidebar, search,
   tables, popups) without fighting its stylesheet rule-by-rule. */
.navy, .coal, .light, .rust, .ayu {
  --bg: var(--cds-bg);
  --fg: var(--cds-text);
  --sidebar-bg: var(--cds-layer);
  --sidebar-fg: var(--cds-text-muted);
  --sidebar-non-existant: var(--cds-text-faint);
  --sidebar-active: var(--cds-link);
  --sidebar-spacer: var(--cds-border-subtle);
  --scrollbar: var(--cds-border);
  --icons: var(--cds-text-faint);
  --icons-hover: var(--cds-link);
  --links: var(--cds-link);
  --inline-code-color: var(--cds-link);
  --theme-popup-bg: var(--cds-layer);
  --theme-popup-border: var(--cds-border);
  --theme-hover: var(--cds-layer2);
  --quote-bg: var(--cds-layer);
  --quote-border: var(--cds-border);
  --table-border-color: var(--cds-border);
  --table-header-bg: var(--cds-layer2);
  --table-alternate-bg: var(--cds-layer);
  --searchbar-border-color: var(--cds-border);
  --searchbar-bg: var(--cds-layer);
  --searchbar-fg: var(--cds-text);
  --search-results-header-fg: var(--cds-text-muted);
  --search-results-border-color: var(--cds-border);
  --search-results-li-bg: var(--cds-layer);
  --warning-border: var(--cds-warning);
}

/* ── Typography — Plex, editorial scale ────────────────────────────────*/
html { font-family: var(--font-sans); }
.content { font-family: var(--font-sans); }
.content main {
  max-width: var(--content-max-width);
  line-height: 1.65;
  font-size: 1.9rem;               /* 19px (10px rem base) */
}
.content h1, .content h2, .content h3,
.content h4, .content h5, .content h6 {
  font-family: var(--font-sans);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: 0;
}
.content h1 { font-size: 3.6rem; margin-top: var(--cds-9); }       /* 36px */
.content h2 { font-size: 2.8rem; margin-top: var(--cds-8);          /* 28px */
  padding-top: var(--cds-5); border-top: 1px solid var(--cds-border-subtle); }
.content h3 { font-size: 2rem; margin-top: var(--cds-7); }          /* 20px */
.content h4 { font-size: 1.6rem; color: var(--cds-text-muted);      /* 16px */
  text-transform: uppercase; letter-spacing: 0.08em; }
.content p, .content li { letter-spacing: 0; }
.content a { text-decoration: none; }
.content a:hover { text-decoration: underline;
  text-underline-offset: 3px; text-decoration-thickness: 1px; }

/* ── Square corners everywhere (Carbon) ────────────────────────────────*/
.content pre, .content code, .content table,
.content blockquote, .menu-title, #searchbar,
.theme-popup, .cds-card, .cds-callout, .cds-hero, .scope, img {
  border-radius: 0 !important;
}

/* ── Code — Plex Mono on a layer surface ───────────────────────────────*/
.content code { font-family: var(--font-mono); font-size: 0.875em; }
.content pre {
  background: var(--cds-layer);
  border: 1px solid var(--cds-border-subtle);
  border-left: 2px solid var(--cds-interactive);
  padding: var(--cds-5);
}
.content :not(pre) > code {
  background: var(--cds-layer);
  padding: 0.1em 0.35em;
  border: 1px solid var(--cds-border-subtle);
}

/* ── Tables — Carbon: strong header rule, zebra layer ───────────────────*/
.content table { border-collapse: collapse; width: 100%; }
.content table thead th {
  background: var(--cds-layer2);
  border-bottom: 2px solid var(--cds-border);
  text-align: left; font-weight: 600;
  padding: var(--cds-3) var(--cds-4);
}
.content table td { border: none;
  border-bottom: 1px solid var(--cds-border-subtle);
  padding: var(--cds-3) var(--cds-4); }
.content table tbody tr:nth-child(odd) { background: var(--cds-layer); }

/* ── Blockquote → Carbon notification (left accent bar) ─────────────────*/
.content blockquote {
  background: var(--cds-info-bg);
  border: none; border-left: 3px solid var(--cds-info);
  color: var(--cds-text); padding: var(--cds-4) var(--cds-5);
}

/* ── Reusable Carbon components for pages ───────────────────────────────
   Author in markdown with raw HTML, e.g.
     <div class="cds-callout extension"> … </div>                         */

/* Notification / callout, four intents + the non-standard marker */
.cds-callout {
  border-left: 3px solid var(--cds-info);
  background: var(--cds-info-bg);
  padding: var(--cds-4) var(--cds-5);
  margin: var(--cds-6) 0;
}
.cds-callout.success   { border-color: var(--cds-success); background: var(--cds-success-bg); }
.cds-callout.warning   { border-color: var(--cds-warning); background: var(--cds-warning-bg); }
.cds-callout.error     { border-color: var(--cds-error);   background: var(--cds-error-bg); }
.cds-callout.extension { border-color: var(--cds-ext);     background: var(--cds-ext-bg); }
.cds-callout .cds-callout-title {
  font-weight: 600; display: block; margin-bottom: var(--cds-2);
}

/* Scope tag — the non-standard disclaimer chip (matches SUMMARY markers) */
.scope {
  display: inline-block; font-family: var(--font-mono);
  font-size: 1.1rem; letter-spacing: 0.04em; text-transform: uppercase; /* 11px */
  padding: 0.2rem 0.6rem; border: 1px solid currentColor; line-height: 1.4;
  vertical-align: middle;
}
.scope.extension { color: var(--cds-ext); }
.scope.draft     { color: var(--cds-warning); }
.scope.spec      { color: var(--cds-success); }

/* Hero — Carbon expressive block for the top of landing/start pages */
.cds-hero {
  background: var(--cds-layer);
  border-left: 4px solid var(--cds-interactive);
  padding: var(--cds-7) var(--cds-7) var(--cds-6);
  margin: 0 0 var(--cds-7);
}
.cds-hero h1 { margin: 0 0 var(--cds-3); border: none; padding: 0; }
.cds-hero p  { color: var(--cds-text-muted); margin: 0; max-width: 67rem; } /* 670px */

/* Card grid — Carbon 2x grid of linked tiles (persona ramps, choices) */
.cds-card-grid {
  display: grid; gap: 1px; background: var(--cds-border-subtle);
  border: 1px solid var(--cds-border-subtle);
  grid-template-columns: repeat(auto-fit, minmax(24rem, 1fr)); /* 240px */
  margin: var(--cds-6) 0;
}
.cds-card {
  background: var(--cds-bg); padding: var(--cds-5);
  text-decoration: none !important; color: var(--cds-text);
  border-left: 2px solid transparent; transition: border-color .1s, background .1s;
}
.cds-card:hover { background: var(--cds-layer); border-left-color: var(--cds-interactive); }
.cds-card .cds-card-title { font-weight: 600; display: block; margin-bottom: var(--cds-2); }
.cds-card .cds-card-desc  { color: var(--cds-text-muted); font-size: 1.5rem; } /* 15px */

/* Carbon icons — vendored under src/images/icons/. Rendered via CSS mask
   so the external SVG takes the token text colour (and recolours on hover),
   which a plain <img> cannot do. Use:
     <span class="cds-icon" style="--i:url(../images/icons/app.svg)"></span> */
.cds-icon {
  display: inline-block; width: 2rem; height: 2rem;        /* 20px */
  vertical-align: -0.2em; margin-right: var(--cds-3);
  background-color: currentColor;
  -webkit-mask: var(--i) no-repeat center / contain;
  mask: var(--i) no-repeat center / contain;
}
.cds-card .cds-icon { width: 2.8rem; height: 2.8rem; margin: 0 0 var(--cds-3); display: block; } /* 28px */
.cds-card .cds-icon { color: var(--cds-text-muted); }
.cds-card:hover .cds-icon { color: var(--cds-interactive); }

/* Diagrams sit on their own surface, full reading width */
.content img[src$=".svg"] {
  display: block; width: 100%; height: auto;
  border: 1px solid var(--cds-border-subtle);
  margin: var(--cds-6) 0;
}
.content figure { margin: var(--cds-6) 0; }
.content figcaption {
  color: var(--cds-text-faint); font-size: 1.4rem;     /* 14px */
  margin-top: var(--cds-3); text-align: center;
}