/* ==========================================================================
   Optis Design System — Shared Tokens & Base Styles
   Version 1.0 | 2026-05-03
   ========================================================================== */

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

/* ---------- Design Tokens ---------- */
:root {
  /* Colour Palette */
  --optis-dark:       #1a1f2e;
  --optis-dark-deep:  #141824;
  --optis-magenta:    #E6007E;
  --optis-green:      #1FB57A;
  --optis-page-bg:    #f5f5f7;
  --optis-card-bg:    #ffffff;
  --optis-text:       #111111;
  --optis-text-2:     #555555;
  --optis-text-3:     #999999;
  --optis-border:     #e2e3e7;

  /* Typography */
  --optis-font:       'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --optis-weight-regular: 400;
  --optis-weight-medium:  500;
  --optis-weight-semi:    600;

  --optis-size-page-title: 20px;
  --optis-size-section:    15px;
  --optis-size-body:       13px;
  --optis-size-label:      11px;
  --optis-size-metric:     22px;

  /* Spacing */
  --optis-page-pad:    32px;
  --optis-card-pad:    20px;
  --optis-card-pad-lg: 24px;
  --optis-grid-gap:    16px;
  --optis-section-gap: 24px;

  /* Surfaces */
  --optis-radius:     10px;
  --optis-radius-sm:   6px;
  --optis-shadow:      0 2px 12px rgba(0,0,0,0.06), 0 1px 3px rgba(0,0,0,0.04);
  --optis-shadow-lg:   0 8px 30px rgba(0,0,0,0.10), 0 2px 8px rgba(0,0,0,0.04);

  /* Nav */
  --optis-nav-h: 52px;
}

/* ---------- Base Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: var(--optis-font);
  font-size: var(--optis-size-body);
  font-weight: var(--optis-weight-regular);
  color: var(--optis-text);
  background: var(--optis-page-bg);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

button { font-family: inherit; cursor: pointer; border: none; background: none; }
input, select, textarea { font-family: inherit; font-size: var(--optis-size-body); }

/* ---------- Typography Utilities ---------- */
.optis-page-title {
  font-size: var(--optis-size-page-title);
  font-weight: var(--optis-weight-medium);
  color: var(--optis-text);
}

.optis-section-header {
  font-size: var(--optis-size-section);
  font-weight: var(--optis-weight-semi);
  color: var(--optis-text);
}

.optis-label {
  font-size: var(--optis-size-label);
  font-weight: var(--optis-weight-medium);
  color: var(--optis-text-3);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.optis-body   { font-size: var(--optis-size-body); color: var(--optis-text); }
.optis-muted  { color: var(--optis-text-2); }
.optis-subtle { color: var(--optis-text-3); }

/* ---------- Cards & Surfaces ---------- */
.optis-card {
  background: var(--optis-card-bg);
  border: 0.5px solid var(--optis-border);
  border-radius: var(--optis-radius);
  box-shadow: var(--optis-shadow);
  padding: var(--optis-card-pad);
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.optis-card-lg { padding: var(--optis-card-pad-lg); }

.optis-card-interactive:hover {
  border-color: var(--optis-magenta);
  box-shadow: var(--optis-shadow-lg);
  transform: translateY(-2px);
}

/* ---------- Metric Cards ---------- */
.optis-metric {
  background: var(--optis-card-bg);
  border: 0.5px solid var(--optis-border);
  border-radius: var(--optis-radius);
  box-shadow: var(--optis-shadow);
  padding: var(--optis-card-pad);
}

.optis-metric-label {
  font-size: var(--optis-size-label);
  font-weight: var(--optis-weight-medium);
  color: var(--optis-text-3);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 6px;
}

.optis-metric-value {
  font-size: var(--optis-size-metric);
  font-weight: var(--optis-weight-medium);
  color: var(--optis-text);
  line-height: 1.2;
}

.optis-metric-delta {
  font-size: var(--optis-size-label);
  font-weight: var(--optis-weight-medium);
  margin-top: 4px;
}

.optis-metric-delta.up   { color: var(--optis-green); }
.optis-metric-delta.down { color: var(--optis-magenta); }

/* ---------- Card Grid ---------- */
.optis-grid     { display: grid; gap: var(--optis-grid-gap); }
.optis-grid-2   { grid-template-columns: repeat(2, 1fr); }
.optis-grid-3   { grid-template-columns: repeat(3, 1fr); }
.optis-grid-4   { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 768px) {
  .optis-grid-2, .optis-grid-3, .optis-grid-4 {
    grid-template-columns: 1fr;
  }
}

/* ---------- Interactive States ---------- */
.optis-focus:focus-visible {
  outline: 2px solid var(--optis-magenta);
  outline-offset: 2px;
}

/* ---------- Status Badges ---------- */
.optis-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: var(--optis-size-label);
  font-weight: var(--optis-weight-medium);
  padding: 3px 10px;
  border-radius: 10px;
  letter-spacing: 0.02em;
}

.optis-badge-active   { background: rgba(31,181,122,0.10); color: var(--optis-green); }
.optis-badge-inactive { background: rgba(153,153,153,0.10); color: var(--optis-text-3); }
.optis-badge-accent   { background: rgba(230,0,126,0.10); color: var(--optis-magenta); }

/* ---------- Buttons ---------- */
.optis-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: var(--optis-size-body);
  font-weight: var(--optis-weight-medium);
  padding: 8px 16px;
  border-radius: var(--optis-radius-sm);
  transition: all 0.15s ease;
  cursor: pointer;
  border: none;
}

.optis-btn-primary {
  background: var(--optis-magenta);
  color: #fff;
}
.optis-btn-primary:hover { background: #cc006e; }

.optis-btn-secondary {
  background: transparent;
  color: var(--optis-text-2);
  border: 1px solid var(--optis-border);
}
.optis-btn-secondary:hover {
  border-color: var(--optis-magenta);
  color: var(--optis-magenta);
}

/* ---------- Page Layout Helpers ---------- */
.optis-page {
  padding: var(--optis-section-gap) var(--optis-page-pad);
  padding-top: calc(var(--optis-nav-h) + var(--optis-section-gap));
  max-width: 1280px;
  margin: 0 auto;
}

/* ---------- Utility ---------- */
.optis-sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}