/* ==========================================================================
   HITT Ops — Design tokens & base styles
   Colours extracted from "HITT corporate colours.jpg"
   ========================================================================== */

:root {
  /* Corporate palette */
  --hitt-ink:        #171717;   /* near-black, primary text / wordmark */
  --hitt-charcoal:   #211916;   /* darkest swatch, deep backgrounds */
  --hitt-teal:       #5C757C;   /* primary brand accent */
  --hitt-sage:       #ABAF96;   /* secondary accent / muted UI */
  --hitt-cream:      #DAD4B2;   /* light surface tint */
  --hitt-olive:      #B3B07D;   /* secondary surface */
  --hitt-amber:      #BC9A1C;   /* call-to-action / highlight */

  /* Semantic tokens (light theme, default) */
  --bg-app:          #F7F6F1;
  --bg-surface:      #FFFFFF;
  --bg-surface-alt:  var(--hitt-cream);
  --bg-header:       var(--hitt-ink);
  --text-primary:    var(--hitt-charcoal);
  --text-secondary:  #5A5650;
  --text-inverse:    #FFFFFF;
  --border-subtle:   #E4E0D4;
  --accent:          var(--hitt-amber);
  --accent-hover:    #A5870F;
  --accent-contrast: #1A1300;
  --brand:           var(--hitt-teal);
  --brand-hover:     #4A6167;
  --success:         #6E8F5A;
  --warning:         var(--hitt-amber);
  --danger:          #B24A3A;
  --focus-ring:      #7FA0A8;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 2px rgba(23,23,23,0.06), 0 1px 1px rgba(23,23,23,0.04);
  --shadow-md: 0 4px 12px rgba(23,23,23,0.08), 0 2px 4px rgba(23,23,23,0.06);
  --shadow-lg: 0 12px 32px rgba(23,23,23,0.14);

  --font-sans: "Calibri", "Segoe UI", "Inter", system-ui, -apple-system, sans-serif;
  --header-height: 60px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-app:          #15140F;
    --bg-surface:      #201E19;
    --bg-surface-alt:  #2A2820;
    --bg-header:       var(--hitt-charcoal);
    --text-primary:    #F1EFE6;
    --text-secondary:  #B9B4A5;
    --text-inverse:    #FFFFFF;
    --border-subtle:   #38352C;
    --accent:          var(--hitt-amber);
    --accent-hover:    #D4AE24;
    --accent-contrast: #1A1300;
    --brand:           #7C99A0;
    --brand-hover:     #93AEB4;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.4);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.45);
    --shadow-lg: 0 12px 32px rgba(0,0,0,0.55);
  }
}

* { box-sizing: border-box; }
html, body {
  margin: 0;
  padding: 0;
  height: 100%;
}
body {
  font-family: var(--font-sans);
  background: var(--bg-app);
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a { color: var(--brand); }
img { max-width: 100%; display: block; }

button, input, select, textarea { font-family: inherit; font-size: inherit; }

:focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 2px;
}

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: background-color .15s ease, border-color .15s ease, transform .05s ease;
  text-decoration: none;
}
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: var(--accent);
  color: var(--accent-contrast);
}
.btn-primary:hover { background: var(--accent-hover); }
.btn-secondary {
  background: transparent;
  border-color: var(--border-subtle);
  color: var(--text-primary);
}
.btn-secondary:hover { border-color: var(--brand); color: var(--brand); }
.btn-block { width: 100%; }
.btn[disabled] { opacity: .55; cursor: not-allowed; }

/* ---------- Top App Header (shared across pages) ---------- */
.app-header {
  height: var(--header-height);
  background: var(--bg-header);
  color: var(--text-inverse);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.25rem;
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 50;
}
.app-header__brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  font-size: 1.1rem;
  text-decoration: none;
  color: var(--text-inverse);
}
.app-header__brand .dot { color: var(--accent); }
.app-header__nav {
  display: flex;
  gap: 1.25rem;
  align-items: center;
}
.app-header__nav a {
  color: rgba(255,255,255,0.82);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 600;
  padding: 0.4rem 0.2rem;
  border-bottom: 2px solid transparent;
}
.app-header__nav a:hover,
.app-header__nav a.active {
  color: #fff;
  border-bottom-color: var(--accent);
}
.app-header__user {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.88rem;
}
.avatar {
  width: 32px; height: 32px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--accent-contrast);
  display: flex; align-items: center; justify-content: center;
  font-weight: 700;
  font-size: 0.8rem;
}

/* .btn-secondary defaults to --text-primary, which is near-black — right
   for light surfaces, invisible against the dark header background (only
   the hover color showed). Override just within the header. */
.app-header .btn-secondary {
  color: var(--text-inverse);
  border-color: rgba(255,255,255,0.35);
}
.app-header .btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ---------- Layout helpers ---------- */
.page-shell {
  max-width: 1280px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 3rem;
}
.page-title {
  font-size: 1.5rem;
  font-weight: 800;
  margin: 0 0 0.25rem;
}
.page-subtitle {
  color: var(--text-secondary);
  margin: 0 0 1.5rem;
  font-size: 0.95rem;
}

/* ---------- Responsive grid for cards ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
}