/**
 * Devis Maker - Design System
 *
 * Professional invoicing tool built on Trust & Authority style
 * with Swiss Modernism influence. Clean, minimal, efficient.
 */

/* ========================================
   CSS Custom Properties (Design Tokens)
   ======================================== */

:root {
  /* Colors - Professional Navy + Trust palette */
  --primary: #1E3A5F;
  --primary-hover: #152C49;
  --primary-light: #EDF2F7;

  --secondary: #2563EB;
  --secondary-hover: #1D4ED8;
  --secondary-light: #DBEAFE;

  --accent: #059669;
  --accent-hover: #047857;
  --accent-light: #D1FAE5;

  --background: #F7F8FA;
  --surface: #FFFFFF;
  --foreground: #0F172A;
  --muted: #64748B;
  --border: #E2E8F0;
  --border-light: #F1F5F9;

  --destructive: #DC2626;
  --destructive-hover: #B91C1C;
  --destructive-light: #FEE2E2;

  --warning: #D97706;
  --warning-light: #FEF3C7;

  /* Typography - Poppins / Open Sans */
  --font-heading: 'Poppins', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Open Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;

  /* Font Scale (Major Third 1.25) */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;

  /* Font Weights */
  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;

  /* Spacing Scale (4px base) */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.06);

  /* Animation */
  --duration-fast: 150ms;
  --duration-normal: 200ms;
  --duration-slow: 300ms;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.45, 0, 0.55, 1);

  /* Z-index scale */
  --z-base: 0;
  --z-dropdown: 10;
  --z-sticky: 20;
  --z-overlay: 40;
  --z-modal: 100;
  --z-toast: 1000;
}

/* ========================================
   Base Reset & Typography
   ======================================== */

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

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

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--font-normal);
  line-height: 1.6;
  color: var(--foreground);
  background-color: var(--background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Headings */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: var(--font-semibold);
  line-height: 1.3;
  color: var(--foreground);
}

h1 { font-size: var(--text-4xl); letter-spacing: -0.025em; }
h2 { font-size: var(--text-3xl); letter-spacing: -0.02em; }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }
h5 { font-size: var(--text-lg); }
h6 { font-size: var(--text-base); }

/* Links */
a {
  color: var(--secondary);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-out);
}

a:hover {
  color: var(--secondary-hover);
}

/* Focus States */
:focus-visible {
  outline: 2px solid var(--secondary);
  outline-offset: 2px;
}

:focus:not(:focus-visible) {
  outline: none;
}

/* Selection */
::selection {
  background-color: var(--secondary-light);
  color: var(--foreground);
}

/* ========================================
   Utility Classes
   ======================================== */

.text-primary { color: var(--primary); }
.text-secondary { color: var(--secondary); }
.text-accent { color: var(--accent); }
.text-muted { color: var(--muted); }
.text-destructive { color: var(--destructive); }

.bg-primary { background-color: var(--primary); }
.bg-secondary { background-color: var(--secondary); }
.bg-accent { background-color: var(--accent); }
.bg-surface { background-color: var(--surface); }
.bg-muted { background-color: var(--border); }

.hidden { display: none; }
.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;
}

/* ========================================
   Animations
   ======================================== */

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInRight {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

@keyframes fadeOut {
  from { opacity: 1; }
  to { opacity: 0; }
}

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

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-4px); }
  75% { transform: translateX(4px); }
}

.animate-fade-in {
  animation: fadeIn var(--duration-normal) var(--ease-out);
}

.animate-fade-in-up {
  animation: fadeInUp var(--duration-slow) var(--ease-out);
}

.animate-fade-in-down {
  animation: fadeInDown var(--duration-slow) var(--ease-out);
}

@media (prefers-reduced-motion: reduce) {
  .animate-fade-in,
  .animate-fade-in-up,
  .animate-fade-in-down {
    animation: none;
  }
}