/* ─────────────────────────────────────────────────────────────────────────
 * design-systems/mongodb/tokens.css
 *
 * Structured token bindings for "Design System Inspired by MongoDB".
 * Forest-dark database aesthetic: a near-black teal canvas (#001e2b) lit
 * by a single bioluminescent neon green (#00ed64), serif authority at
 * hero scale, and shadows that carry the brand color into elevation.
 *
 * Key brand decisions encoded here:
 *   - Forest Black (#001e2b) as the primary canvas — never pure black;
 *     the teal undertone is what keeps the dark mode feeling alive
 *     rather than void
 *   - MongoDB Green (#00ed64) as the singular electric accent — used
 *     for highlights, underlines, and one CTA per screen
 *   - MongoDB Value Serif for display sizes — editorial authority at
 *     database-company scale; Euclid Circular A for everything else
 *   - Source Code Pro as the mono voice — wide-tracked uppercase
 *     labels are the "database field" identity
 *   - Teal-tinted shadows (rgba(0,30,43,0.12)) — depth that belongs to
 *     the MongoDB color world, not generic neutral black
 *   - Full 4-tier fg/border ramps — MongoDB genuinely uses #ffffff →
 *     #e8edeb → #b8c4c2 → #5c6c75 for cascading text hierarchies and
 *     #3d4f58 for dark-surface edges
 * ─────────────────────────────────────────────────────────────────── */

:root {
  /* ─── Surface ─────────────────────────────────────────────────────
   * Forest-dark canvas: the page is the deepest teal-black; cards lift
   * on a slightly warmer deep-teal panel. No warm tier — MongoDB's
   * palette is strictly cool (teal, green, blue) and surface-warm
   * aliases to the dark surface rather than introducing an amber tint
   * that would break the forest atmosphere. */
  --bg: #001e2b;             /* Forest Black — the deepest teal-black canvas */
  --surface: #1c2d38;        /* Deep Teal — lifted cards / secondary dark panels */
  --surface-warm: var(--surface); /* alias — MongoDB has no warm tier */

  /* ─── Foreground ──────────────────────────────────────────────────
   * Four-tier ramp matches MongoDB's real usage on dark surfaces:
   * pure white for headings, light-input for body, silver-teal for
   * captions, cool-gray for metadata. Independently bound (not
   * aliased) because the brand actually paints each tier somewhere. */
  --fg: #ffffff;             /* Pure White — primary text on dark */
  --fg-2: #e8edeb;           /* Light Input — body text, secondary headings */
  --muted: #b8c4c2;          /* Silver Teal — captions, supporting text */
  --meta: #5c6c75;           /* Cool Gray — metadata, tertiary labels */

  /* ─── Border ──────────────────────────────────────────────────────
   * Teal Gray edges on dark surfaces — the cool border tone that
   * belongs to the forest palette. border-soft aliases because
   * MongoDB does not draw an inner-separator tier distinct from the
   * card edge on dark mode. */
  --border: #3d4f58;         /* Teal Gray — dark-surface card edge */
  --border-soft: var(--border); /* alias — no inner separator tier on dark */

  /* ─── Accent ──────────────────────────────────────────────────────
   * MongoDB Green — neon, electric, bioluminescent. Used sparingly
   * (≤2 per screen) for headline highlights, accent underlines, and
   * one CTA per section. accent-on is Forest Black (not white)
   * because neon green is luminous enough that dark text reads with
   * far more contrast than white. accent-hover is the functional
   * muted Dark Green (#00684a) from DESIGN.md §2 — the brand's own
   * darker green variant, not a synthesized darken. */
  --accent: #00ed64;
  --accent-on: #001e2b;      /* Forest Black text on neon green CTAs */
  --accent-hover: #00684a;   /* Dark Green — MongoDB's own muted variant */
  --accent-active: color-mix(in oklab, var(--accent-hover), black 12%);

  /* ─── Semantic ────────────────────────────────────────────────────
   * Standard semantic palette. MongoDB's brand green is already the
   * accent; success keeps the schema default so it does not collide
   * with the neon brand voice. */
  --success: #16a34a;
  --warn: #eab308;
  --danger: #dc2626;

  /* ─── Typography ──────────────────────────────────────────────────
   * Three voices, three roles:
   *   --font-display: MongoDB Value Serif for editorial hero headlines
   *   --font-body: Euclid Circular A for geometric body / UI
   *   --font-mono: Source Code Pro for code and wide-tracked labels
   * The serif-at-hero choice is the typographic signature; component
   * CSS should never substitute the body face for display sizes. */
  --font-display: "MongoDB Value Serif", "Times New Roman", Times, ui-serif, Georgia, serif;
  --font-body: "Euclid Circular A", "Akzidenz-Grotesk Std", -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
  --font-mono: "Source Code Pro", ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Monaco, Consolas, monospace;

  /* Type scale — distilled from DESIGN.md §3 hierarchy table.
   * 96px hero (MongoDB Value Serif) and 64px sub-hero are the
   * editorial moves; the rest follows Euclid Circular A from 11px
   * small to 36px section heading. Weight 300 body is encoded in
   * component CSS (the schema does not carry weight tokens). */
  --text-xs: 11px;           /* Small — tags, annotations */
  --text-sm: 14px;           /* Caption, Code Label */
  --text-base: 16px;         /* Body Light, Nav, Code Body */
  --text-lg: 20px;           /* Body Large — introductions */
  --text-xl: 24px;           /* Sub-heading — feature titles */
  --text-2xl: 36px;          /* Section Heading */
  --text-3xl: 64px;          /* Display Secondary — serif sub-hero */
  --text-4xl: 96px;          /* Display Hero — serif at editorial scale */

  /* Leading + tracking — DESIGN.md §3.
   * Body Light uses 1.5–2.0; we sit at 1.5 so paragraphs breathe
   * without losing rhythm. Hero display uses 1.20 (tight). Display
   * letter-spacing is `normal` — MongoDB Value Serif at 96px does
   * not compress like Geist or industrial sans; the serif drawing
   * carries the authority without negative tracking. */
  --leading-body: 1.5;
  --leading-tight: 1.2;
  --tracking-display: normal;

  /* ─── Spacing ─────────────────────────────────────────────────────
   * 8px-rooted scale; MongoDB's documented spacing (1/4/7/8/10/12/
   * 14/15/16/18/20/24/32) includes odd sub-tiers (7, 14, 15, 18)
   * for fine-grained type alignment that stay component-internal.
   * The schema's 4/8/12/16/20/24/32/48 covers the structural rhythm. */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-12: 48px;

  /* Section rhythm — DESIGN.md §5 Whitespace Philosophy: dark hero
   * sections use extra vertical padding (80px+) to let the forest-
   * dark background breathe. 96px desktop sits at the generous end
   * of MongoDB's documented range. */
  --section-y-desktop: 96px;
  --section-y-tablet: 64px;
  --section-y-phone: 40px;

  /* ─── Radius ──────────────────────────────────────────────────────
   * DESIGN.md §5 radius scale: 1/2/4/8/16/20/24/30/32/48/100/9999.
   * Schema slots bind to: 4 (input subtle), 8 (standard card / link),
   * 16 (card), 9999 (pill button). The 30–32px image radius and
   * 48px hero radius live as inline overrides in components.html
   * where they apply — they are surface-specific, not scale-wide. */
  --radius-sm: 4px;          /* inputs, small buttons */
  --radius-md: 8px;          /* standard cards, links */
  --radius-lg: 16px;         /* feature cards, containers */
  --radius-pill: 9999px;     /* pill buttons, badges */

  /* ─── Elevation ───────────────────────────────────────────────────
   * Forest-tinted shadow signature. DESIGN.md §6: the primary card
   * elevation uses rgba(0, 30, 43, 0.12) — a teal-tinted shadow that
   * carries the forest-dark brand color into the depth system. Even
   * on light surfaces, shadows feel like they belong to the MongoDB
   * color world rather than being generic neutral black. */
  --elev-flat: none;
  --elev-ring: 0 0 0 1px var(--border);
  --elev-raised:
    0 26px 44px rgba(0, 30, 43, 0.12),
    0 7px 13px rgba(0, 0, 0, 0.13);

  /* ─── Focus ring ──────────────────────────────────────────────────
   * Neon-green-tinted halo at 30% alpha — uses the brand accent so
   * keyboard focus reads as part of the MongoDB color world rather
   * than a generic blue ring. */
  --focus-ring: 0 0 0 3px color-mix(in oklab, var(--accent), transparent 70%);

  /* ─── Motion ──────────────────────────────────────────────────────
   * Standard durations — MongoDB's identity lives in color, type,
   * and shadow; animation is purposeful, not choreographed. */
  --motion-fast: 150ms;
  --motion-base: 200ms;
  --ease-standard: cubic-bezier(0.2, 0, 0, 1);

  /* ─── Layout ──────────────────────────────────────────────────────
   * 1200px max content width — contained editorial layouts within
   * generous full-bleed dark sections. */
  --container-max: 1200px;
  --container-gutter-desktop: 24px;
  --container-gutter-tablet: 16px;
  --container-gutter-phone: 12px;
}