/* ============================================================
   VCT Analytics — Design Tokens
   Single source of truth for colors, type, spacing, radii,
   shadows, and base typography styles.
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&display=swap');

:root {
  /* ---------- Color: backgrounds ---------- */
  --vct-bg-primary:   #FAFAF7;   /* page body, card backgrounds — warm parchment */
  --vct-bg-secondary: #F2F0EB;   /* sidebar, panels, table header rows */
  --vct-surface:      #FFFFFF;   /* elevated cards, modals */

  /* ---------- Color: text ---------- */
  --vct-fg-primary:   #1A1A1A;   /* headings, key numbers */
  --vct-fg-secondary: #6B6B60;   /* labels, descriptions, secondary metrics */
  --vct-fg-tertiary:  #9C9C90;   /* timestamps, footnotes, muted */

  /* ---------- Color: accents ---------- */
  --vct-accent:        #1B4332;  /* deep forest — active nav, CTAs, selected */
  --vct-accent-hover:  #2D6A4F;  /* medium green — hover */
  --vct-accent-light:  #D8F3DC;  /* pale mint — selected row, badges */

  /* ---------- Color: semantic ---------- */
  --vct-positive: #2D6A4F;       /* profit, upward */
  --vct-negative: #C1121F;       /* loss, cost overruns */
  --vct-neutral:  #B08D57;       /* flat / informational — warm gold */

  /* ---------- Color: structural ---------- */
  --vct-border:        #E8E6E1;
  --vct-border-strong: #D8D6D1;  /* one tick darker for emphasis */

  /* ---------- Shadow ---------- */
  --vct-shadow-card:  0 1px 3px rgba(0, 0, 0, 0.04);
  --vct-shadow-modal: 0 4px 12px rgba(0, 0, 0, 0.06);

  /* ---------- Radius ---------- */
  --vct-radius-sm: 6px;
  --vct-radius-md: 8px;
  --vct-radius-lg: 12px;   /* cards */
  --vct-radius-pill: 999px;

  /* ---------- Spacing scale (4-based) ---------- */
  --vct-space-1: 4px;
  --vct-space-2: 8px;
  --vct-space-3: 12px;
  --vct-space-4: 16px;
  --vct-space-5: 20px;   /* grid gap between cards */
  --vct-space-6: 24px;   /* card padding (small) */
  --vct-space-7: 32px;   /* card padding (large) */
  --vct-space-8: 40px;   /* section spacing */
  --vct-space-10: 56px;  /* top bar height */

  /* ---------- Layout ---------- */
  --vct-max-width: 1200px;
  --vct-topbar-h:  56px;

  /* ---------- Type: family ---------- */
  --vct-font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --vct-font-num:  'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* ---------- Type: size scale ---------- */
  --vct-text-micro:  11px;   /* uppercase labels above hero numbers */
  --vct-text-xs:     12px;
  --vct-text-sm:     13px;   /* table data lower bound */
  --vct-text-base:   14px;   /* table data upper bound, body */
  --vct-text-md:     15px;
  --vct-text-lg:     17px;   /* card titles */
  --vct-text-xl:     20px;
  --vct-text-2xl:    24px;
  --vct-text-hero:   32px;   /* hero numbers */
  --vct-text-hero-lg:40px;

  /* ---------- Type: weights ---------- */
  --vct-weight-regular: 400;
  --vct-weight-medium:  500;
  --vct-weight-semi:    600;

  /* ---------- Type: tracking ---------- */
  --vct-tracking-tight:   -0.02em;  /* headings */
  --vct-tracking-normal:  0;
  --vct-tracking-label:   0.06em;   /* table headers */
  --vct-tracking-label-lg:0.08em;   /* hero labels */

  /* ---------- Motion ---------- */
  --vct-ease-out:    cubic-bezier(0.2, 0, 0, 1);
  --vct-duration-1:  80ms;   /* press */
  --vct-duration-2:  120ms;  /* hover */
  --vct-duration-3:  240ms;
  --vct-duration-4:  400ms;  /* number count-up */
}

/* ============================================================
   Base typography
   ============================================================ */

html, body {
  font-family: var(--vct-font-sans);
  font-size: var(--vct-text-base);
  line-height: 1.5;
  color: var(--vct-fg-secondary);
  background: var(--vct-bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--vct-fg-primary);
  font-weight: var(--vct-weight-semi);
  letter-spacing: var(--vct-tracking-tight);
  line-height: 1.25;
  margin: 0;
}

h1 { font-size: var(--vct-text-2xl); }
h2 { font-size: var(--vct-text-xl); }
h3 { font-size: var(--vct-text-lg); }
h4 { font-size: var(--vct-text-md); }

p {
  margin: 0;
  color: var(--vct-fg-secondary);
}

/* ============================================================
   Semantic typography classes
   Use these directly on elements so non-CSS-token consumers
   pick up the system without re-deriving values.
   ============================================================ */

.vct-label {
  font-size: var(--vct-text-micro);
  font-weight: var(--vct-weight-medium);
  letter-spacing: var(--vct-tracking-label-lg);
  text-transform: uppercase;
  color: var(--vct-fg-tertiary);
}

.vct-label-table {
  font-size: var(--vct-text-micro);
  font-weight: var(--vct-weight-medium);
  letter-spacing: var(--vct-tracking-label);
  text-transform: uppercase;
  color: var(--vct-fg-secondary);
}

.vct-hero-number {
  font-size: var(--vct-text-hero);
  font-weight: var(--vct-weight-semi);
  letter-spacing: var(--vct-tracking-tight);
  color: var(--vct-fg-primary);
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
}

.vct-hero-number--lg {
  font-size: var(--vct-text-hero-lg);
}

.vct-num {
  font-variant-numeric: tabular-nums;
  font-feature-settings: 'tnum' 1;
}

.vct-secondary { color: var(--vct-fg-secondary); }
.vct-tertiary  { color: var(--vct-fg-tertiary); }

.vct-positive { color: var(--vct-positive); }
.vct-negative { color: var(--vct-negative); }
.vct-neutral-fg { color: var(--vct-neutral); }

/* ============================================================
   Reusable surface primitives
   ============================================================ */

.vct-card {
  background: var(--vct-surface);
  border: 1px solid var(--vct-border);
  border-radius: var(--vct-radius-lg);
  box-shadow: var(--vct-shadow-card);
  padding: var(--vct-space-7);
}

.vct-divider {
  background: var(--vct-border);
  width: 1px;
  align-self: stretch;
}

.vct-divider-h {
  background: var(--vct-border);
  height: 1px;
  width: 100%;
}

/* Pill toggle (granularity) ------------------------------------ */
.vct-pill-group {
  display: inline-flex;
  background: var(--vct-bg-secondary);
  border-radius: var(--vct-radius-pill);
  padding: 3px;
  gap: 2px;
}
.vct-pill {
  font-family: var(--vct-font-sans);
  font-size: var(--vct-text-sm);
  font-weight: var(--vct-weight-medium);
  color: var(--vct-fg-secondary);
  background: transparent;
  border: 0;
  padding: 6px 14px;
  border-radius: var(--vct-radius-pill);
  cursor: pointer;
  transition: background var(--vct-duration-2) var(--vct-ease-out),
              color var(--vct-duration-2) var(--vct-ease-out);
}
.vct-pill:hover { color: var(--vct-fg-primary); }
.vct-pill[aria-pressed='true'],
.vct-pill.is-active {
  background: var(--vct-accent);
  color: #fff;
}

/* Buttons ------------------------------------------------------- */
.vct-btn {
  font-family: var(--vct-font-sans);
  font-size: var(--vct-text-sm);
  font-weight: var(--vct-weight-medium);
  border-radius: var(--vct-radius-md);
  padding: 8px 14px;
  border: 1px solid transparent;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: background var(--vct-duration-2) var(--vct-ease-out),
              color var(--vct-duration-2) var(--vct-ease-out),
              border-color var(--vct-duration-2) var(--vct-ease-out),
              transform var(--vct-duration-1) var(--vct-ease-out);
}
.vct-btn:active { transform: scale(0.98); }

.vct-btn--primary {
  background: var(--vct-accent);
  color: #fff;
}
.vct-btn--primary:hover { background: var(--vct-accent-hover); }

.vct-btn--ghost {
  background: transparent;
  color: var(--vct-fg-primary);
  border-color: var(--vct-border);
}
.vct-btn--ghost:hover {
  background: rgba(27, 67, 50, 0.06);
  border-color: var(--vct-border-strong);
}

.vct-btn--link {
  background: transparent;
  color: var(--vct-accent);
  padding: 0;
  border: 0;
}
.vct-btn--link:hover { color: var(--vct-accent-hover); text-decoration: underline; }

/* Badges -------------------------------------------------------- */
.vct-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: var(--vct-text-xs);
  font-weight: var(--vct-weight-medium);
  padding: 2px 8px;
  border-radius: var(--vct-radius-pill);
  background: var(--vct-accent-light);
  color: var(--vct-accent);
}
.vct-badge--neutral { background: rgba(176,141,87,0.12); color: var(--vct-neutral); }
.vct-badge--negative { background: rgba(193,18,31,0.08); color: var(--vct-negative); }

/* Trend deltas -------------------------------------------------- */
.vct-delta {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  font-size: var(--vct-text-xs);
  font-weight: var(--vct-weight-medium);
  font-variant-numeric: tabular-nums;
}
.vct-delta--up   { color: var(--vct-positive); }
.vct-delta--down { color: var(--vct-negative); }
.vct-delta--flat { color: var(--vct-neutral); }

/* Skeleton loader ---------------------------------------------- */
@keyframes vct-shimmer {
  0%   { background-position: -200% 0; }
  100% { background-position:  200% 0; }
}
.vct-skeleton {
  background: linear-gradient(90deg,
    var(--vct-bg-secondary) 0%,
    #F7F5F0 50%,
    var(--vct-bg-secondary) 100%);
  background-size: 200% 100%;
  animation: vct-shimmer 1.4s linear infinite;
  border-radius: var(--vct-radius-sm);
}

/* Focus ring (accessible, on-brand) ---------------------------- */
.vct-focus,
.vct-btn:focus-visible,
.vct-pill:focus-visible {
  outline: 2px solid var(--vct-accent);
  outline-offset: 2px;
}