/*
 * Blueforce Field OS — design tokens
 * ---------------------------------------------------------------------------
 * One source for both operator surfaces:
 *   - the device console  (Python/tkinter, bfos/ui_theme.py reads these values)
 *   - the central panel   (stdlib http.server, web/templates/*)
 *
 * The surfaces share a status vocabulary because they describe the same fleet
 * from two ends. A colour here means one thing everywhere: a device state, a
 * severity, or an action weight. It never decorates.
 *
 * WHY LIGHT, NOT DARK
 * The console is used in workshops, dealer service areas and customer sites --
 * bright overhead light, daylight from a roller door, a 14" laptop panel. A
 * near-black console loses its own body text there and its state colours
 * collapse into equal-brightness smudges. So the ground is light, the text is
 * dark, and saturation is spent only where it carries meaning: state.
 *
 * WHAT THE COLOURS HAVE TO CARRY
 * The catalogue is 48 operations, 13 of which write. The state machine has
 * three stages and a device can also be failed or absent. That is four
 * severities plus one action colour, and no more -- a fifth hue would make the
 * distinction something an operator has to read instead of see.
 */

:root {
  /* -- Ground and structure -------------------------------------------- */
  --bg-app: #f6f7f8;        /* window ground */
  --bg-panel: #ffffff;      /* raised surfaces, cards, table body */
  --bg-sunken: #eef0f2;     /* wells: log output, code, inactive rows */
  --bg-header: #1d2530;     /* app header; the one dark region */
  --border: #d5d9de;        /* hairline between regions */
  --border-strong: #b6bcc4; /* input borders, table rules */

  /* -- Text ------------------------------------------------------------- */
  --text: #1a1f26;          /* body */
  --text-muted: #5c6570;    /* secondary lines, labels */
  --text-faint: #8b939c;    /* timestamps, hints, placeholders */
  --text-on-dark: #e8ebee;  /* header text */
  --text-on-accent: #ffffff;

  /* -- Action ----------------------------------------------------------- */
  /* One accent. It marks the action the operator came to take and the
     selection in a list; nothing else. */
  --accent: #1d4ed8;
  --accent-hover: #1a43bd;
  --accent-active: #16389e;
  --accent-soft: #e8eeff;   /* selected row, focus ring fill */
  --focus-ring: #1d4ed8;

  /* -- State: the fleet vocabulary -------------------------------------- */
  /* Four severities. Each has a strong form for text and a soft form for
     fills, so a badge can be built from either without a second palette. */
  --ok: #15803d;
  --ok-soft: #e6f4ea;
  --warn: #b45309;
  --warn-soft: #fdf3e3;
  --danger: #b91c1c;
  --danger-soft: #fdecec;
  --info: #1d4ed8;
  --info-soft: #e8eeff;
  --idle: #5c6570;          /* not yet acted on: not a failure */
  --idle-soft: #eef0f2;

  /* -- Device state machine --------------------------------------------- */
  /* PROVISIONED_OFFLINE -> ENROLLED -> READY, and the failure/absence that
     sit outside the sequence. Kept as named tokens so no surface invents a
     fifth stage or repaints a stage by accident. */
  --state-provisioned: var(--info);
  --state-enrolled: var(--warn);
  --state-ready: var(--ok);
  --state-failed: var(--danger);
  --state-absent: var(--idle);

  /* -- Type ------------------------------------------------------------- */
  /* Workhorse faces only: this is an Operate surface, and the value of a
     webfont here is negative -- the fleet installs offline from a committed
     pool, so a font CDN is a broken page on every device. The UI face is
     whatever the platform ships; the data face is monospace so device ids,
     counts and exit codes line up in a column. */
  --font-ui: system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans",
             "DejaVu Sans", sans-serif;
  --font-data: ui-monospace, "Cascadia Mono", "JetBrains Mono", Menlo,
               Consolas, "DejaVu Sans Mono", monospace;

  --size-xs: 12px;   /* timestamps, table meta */
  --size-sm: 13px;   /* labels, table body */
  --size-md: 15px;   /* body, inputs, buttons */
  --size-lg: 18px;   /* card titles */
  --size-xl: 22px;   /* view titles */
  --size-2xl: 30px;  /* the one headline figure per view */

  --leading-tight: 1.25;
  --leading-normal: 1.5;

  /* -- Space ------------------------------------------------------------ */
  /* A 4px rhythm. Named, so a component never hand-picks 7px. */
  --sp-1: 4px;
  --sp-2: 8px;
  --sp-3: 12px;
  --sp-4: 16px;
  --sp-5: 24px;
  --sp-6: 32px;
  --sp-7: 48px;

  --radius: 6px;
  --radius-lg: 10px;

  /* -- Elevation -------------------------------------------------------- */
  /* Two levels. More would separate regions that are not separate. */
  --shadow-sm: 0 1px 2px rgba(16, 24, 40, .06);
  --shadow-md: 0 4px 12px rgba(16, 24, 40, .10);

  /* -- Metrics ---------------------------------------------------------- */
  --row-h: 44px;            /* fleet table row: comfortable at arm's length */
  --control-h: 36px;        /* buttons and inputs share one height */
  --header-h: 56px;
  --sidebar-w: 220px;
}