/* OSA Preflight — direction B ("Flight deck") design tokens.
   Shared by the home page (atlasoperational.com), PRAT and the Preflight Brief.
   Fonts: Oswald (OSA brand) for display, labels, buttons and codes;
   Barlow for reading text, controls and crew names. */
/* Oswald is self-hosted (SIL OFL, see assets/fonts) so bases with poor connectivity still get the brand face. */
@font-face{font-family:'Oswald';font-style:normal;font-weight:400;font-display:swap;src:url('../assets/fonts/oswald-latin-400-normal.woff2') format('woff2')}
@font-face{font-family:'Oswald';font-style:normal;font-weight:500;font-display:swap;src:url('../assets/fonts/oswald-latin-500-normal.woff2') format('woff2')}
@font-face{font-family:'Oswald';font-style:normal;font-weight:600;font-display:swap;src:url('../assets/fonts/oswald-latin-600-normal.woff2') format('woff2')}
@font-face{font-family:'Oswald';font-style:normal;font-weight:700;font-display:swap;src:url('../assets/fonts/oswald-latin-700-normal.woff2') format('woff2')}


@font-face{font-family:'Barlow';font-style:normal;font-weight:400;font-display:swap;src:url('../assets/fonts/Barlow-Regular.ttf') format('truetype')}
@font-face{font-family:'Barlow';font-style:normal;font-weight:500;font-display:swap;src:url('../assets/fonts/Barlow-Medium.ttf') format('truetype')}
@font-face{font-family:'Barlow';font-style:normal;font-weight:600;font-display:swap;src:url('../assets/fonts/Barlow-SemiBold.ttf') format('truetype')}
@font-face{font-family:'Barlow';font-style:normal;font-weight:700;font-display:swap;src:url('../assets/fonts/Barlow-Bold.ttf') format('truetype')}
:root{
  color-scheme: dark;

  /* Type */
  --font-display: 'Oswald', 'Arial Narrow', sans-serif;
  --font-body: 'Barlow', 'Trebuchet MS', sans-serif;

  /* Grounds and surfaces */
  --bg: #1E1F1B;            /* page */
  --surface: #2A2C27;       /* tiles, cards, sections */
  --surface-sunk: #25261F;  /* section header band */
  --surface-hover: #30322C;

  /* Lines */
  --line: #3F413B;          /* dividers, card borders */
  --line-2: #4D4F48;        /* empty states, inner panels */
  --line-strong: #6B6E66;   /* input and secondary-button borders (≥3:1 on --bg) */

  /* Text (all ≥4.5:1 on --bg and --surface) */
  --text: #EEEEE9;
  --text-2: #C9CAC3;
  --muted: #A9ABA3;
  --placeholder: #8A8D84;

  /* Brand */
  --accent: #FA5328;        /* OSA orange: active tab, ticks, primary actions, eyebrows */
  --on-accent: #1E1F1B;     /* text on orange fills — never white */
  --logo-plate: #FFFFFF;    /* OSA logo always sits on a white plate on dark grounds */

  /* Risk bands. Caution is used in the brief mock-up; the others are PROPOSED for
     PRAT outcome banners — check contrast and agree with HOTC before use. Dark text on all fills. */
  --band-normal: #5BC08A;
  --band-caution: #F2B33D;
  --band-high: #FA8A3C;
  --band-critical: #FF6B5E;

  /* Shape and rhythm */
  --radius: 4px;            /* buttons, inputs, chips */
  --radius-card: 6px;       /* tiles, sections */
  --border: 1.5px;
  --gutter: 32px;           /* 16px at ≤760px */
  --max-width: 1240px;
  --touch: 46px;            /* minimum control height (≥44px) */
}

/* Consistent return to the OSA Preflight home page. */
a.site-home{box-sizing:border-box;display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:8px 12px;border:1px solid var(--line-strong,#62665c);border-radius:4px;background:var(--surface,#2a2c27);color:var(--text,#fff);font:500 14px var(--font-display,Oswald,sans-serif);text-decoration:none;white-space:nowrap;flex-shrink:0;text-transform:none;letter-spacing:.02em}a.site-home:hover{background:var(--surface-hover,#353831);color:var(--text,#fff)}a.site-home svg{flex-shrink:0}.home-nav{display:flex;align-items:center;gap:16px;flex-wrap:wrap}a.site-home:focus-visible{outline:3px solid var(--accent,#fa5328);outline-offset:3px}