/* USSP Design System — Variables, Typography, Spacing */
:root {
  /* Brand Colors */
  --color-primary: #1a4b8c;
  --color-primary-light: #2563b0;
  --color-primary-dark: #0f2d5a;
  --color-secondary: #00843d;
  --color-accent: #f5a623;
  --color-danger: #d9534f;
  --color-warning: #f0ad4e;
  --color-success: #28a745;
  --color-info: #17a2b8;

  /* Neutrals */
  --color-white: #ffffff;
  --color-gray-50: #f9fafb;
  --color-gray-100: #f3f4f6;
  --color-gray-200: #e5e7eb;
  --color-gray-300: #d1d5db;
  --color-gray-400: #9ca3af;
  --color-gray-500: #6b7280;
  --color-gray-600: #4b5563;
  --color-gray-700: #374151;
  --color-gray-800: #1f2937;
  --color-gray-900: #111827;

  /* Typography */
  --font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-mono: 'Consolas', 'Courier New', monospace;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;

  /* Borders */
  --border-radius-sm: 4px;
  --border-radius: 6px;
  --border-radius-lg: 8px;
  --border-radius-xl: 12px;
  --border-color: var(--color-gray-200);

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.10);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
  --shadow-modal: 0 20px 60px rgba(0, 0, 0, 0.20);

  /* Layout */
  --sidebar-width: 240px;
  --header-height: 60px;
  --content-max-width: 1200px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition: 250ms ease;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  color: var(--color-gray-800);
  background-color: var(--color-gray-50);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Status colors */
.status--open { color: var(--color-info); }
.status--in-progress { color: var(--color-primary); }
.status--resolved { color: var(--color-success); }
.status--escalated { color: var(--color-danger); }
.status--closed { color: var(--color-gray-500); }
.status--pending { color: var(--color-warning); }

/* Priority badges */
.priority--low { background: var(--color-gray-100); color: var(--color-gray-600); }
.priority--medium { background: #fef3c7; color: #92400e; }
.priority--high { background: #fee2e2; color: #991b1b; }
.priority--critical { background: #7f1d1d; color: #fef2f2; }

.loading-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
  gap: var(--space-4);
  color: var(--color-gray-500);
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--color-gray-200);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}