/* ============================================
   BASE.CSS - Industrial Workshop Platform
   Professional, Technical, Functional
   ============================================ */

/* --------------------------------------------
   1. VARIABLES
   -------------------------------------------- */
:root {
  /* Industrial Color Palette */
  --color-background: #FFFFFF;
  --color-background-alt: #F1F5F9; /* Industrial gray-100 */
  --color-background-dark: #1E293B; /* Dark industrial */
  
  --color-text: #0F172A; /* Near black */
  --color-text-secondary: #475569; /* Industrial gray */
  --color-text-muted: #64748B;
  --color-text-inverse: #F8FAFC;
  
  --color-primary: #334155; /* Steel gray-blue */
  --color-primary-hover: #1E293B;
  --color-primary-light: #475569;
  
  --color-secondary: #166534; /* Deep green */
  --color-secondary-hover: #14532D;
  --color-secondary-light: #22C55E;
  
  --color-accent: #EA580C; /* Safety orange */
  --color-accent-hover: #C2410C;
  --color-accent-light: #FED7AA;
  
  --color-success: #15803D;
  --color-warning: #CA8A04;
  --color-danger: #DC2626;
  
  /* Neutral Grays - Industrial Scale */
  --gray-50: #F8FAFC;
  --gray-100: #F1F5F9;
  --gray-200: #E2E8F0;
  --gray-300: #CBD5E1;
  --gray-400: #94A3B8;
  --gray-500: #64748B;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1E293B;
  --gray-900: #0F172A;
  
  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  --font-mono: "SF Mono", SFMono-Regular, Consolas, "Liberation Mono", Menlo, Courier, monospace;
  
  --text-xs: 0.75rem;    /* 12px */
  --text-sm: 0.875rem;   /* 14px */
  --text-base: 1rem;     /* 16px */
  --text-lg: 1.125rem;   /* 18px */
  --text-xl: 1.25rem;    /* 20px */
  --text-2xl: 1.5rem;    /* 24px */
  --text-3xl: 1.875rem;  /* 30px */
  --text-4xl: 2.25rem;   /* 36px */
  --text-5xl: 3rem;      /* 48px */
  
  --leading-tight: 1.2;
  --leading-normal: 1.5;
  --leading-relaxed: 1.7;
  
  /* Spacing Scale (0-96px) */
  --space-0: 0;
  --space-1: 0.25rem;   /* 4px */
  --space-2: 0.5rem;    /* 8px */
  --space-3: 0.75rem;   /* 12px */
  --space-4: 1rem;      /* 16px */
  --space-5: 1.25rem;   /* 20px */
  --space-6: 1.5rem;    /* 24px */
  --space-8: 2rem;      /* 32px */
  --space-10: 2.5rem;   /* 40px */
  --space-12: 3rem;     /* 48px */
  --space-16: 4rem;     /* 64px */
  --space-20: 5rem;     /* 80px */
  --space-24: 6rem;     /* 96px */
  
  /* Radius - Industrial (sharp but functional) */
  --radius-none: 0;
  --radius-sm: 0.125rem;  /* 2px */
  --radius-base: 0.25rem; /* 4px */
  --radius-md: 0.375rem;  /* 6px */
  --radius-lg: 0.5rem;    /* 8px */
  --radius-xl: 0.75rem;   /* 12px */
  
  /* Shadows - Material Industrial */
  --shadow-sm: 0 1px 2px 0 rgba(15, 23, 42, 0.05);
  --shadow-base: 0 1px 3px 0 rgba(15, 23, 42, 0.1), 0 1px 2px 0 rgba(15, 23, 42, 0.06);
  --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.1), 0 2px 4px -1px rgba(15, 23, 42, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, 0.1), 0 4px 6px -2px rgba(15, 23, 42, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(15, 23, 42, 0.1), 0 10px 10px -5px rgba(15, 23, 42, 0.04);
  
  /* Transitions */
  --duration-fast: 150ms;
  --duration-base: 200ms;
  --duration-slow: 300ms;
  --ease-default: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-in: cubic-bezier(0.4, 0, 1, 1);
  --ease-out: cubic-bezier(0, 0, 0.2, 1);
}

/* --------------------------------------------
   2. RESET & NORMALIZE
   -------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  border: 0 solid var(--gray-200);
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  text-rendering: optimizeLegibility;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

input,
button,
textarea,
select {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  background: none;
}

button:disabled {
  cursor: not-allowed;
}

a {
  text-decoration: none;
  color: inherit;
}

ul,
ol {
  list-style: none;
}

table {
  border-collapse: collapse;
  border-spacing: 0;
}

/* --------------------------------------------
   3. BASE STYLES
   -------------------------------------------- */
body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  font-weight: 400;
  color: var(--color-text);
  background-color: var(--color-background);
}

/* Typography - Bold & Technical */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: var(--leading-tight);
  color: var(--color-text);
  letter-spacing: -0.025em;
}

h1 { font-size: var(--text-4xl); margin-bottom: var(--space-6); }
h2 { font-size: var(--text-3xl); margin-bottom: var(--space-5); }
h3 { font-size: var(--text-2xl); margin-bottom: var(--space-4); }
h4 { font-size: var(--text-xl); margin-bottom: var(--space-3); }
h5 { font-size: var(--text-lg); margin-bottom: var(--space-2); }
h6 { font-size: var(--text-base); margin-bottom: var(--space-2); text-transform: uppercase; letter-spacing: 0.05em; }

p {
  margin-bottom: var(--space-4);
  color: var(--color-text-secondary);
}

p:last-child {
  margin-bottom: 0;
}

/* Links - Technical/Industrial */
a {
  color: var(--color-primary);
  transition: color var(--duration-fast) var(--ease-default);
}

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

a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* Technical Text Elements */
code, kbd, pre {
  font-family: var(--font-mono);
  font-size: 0.9em;
}

pre {
  background-color: var(--gray-100);
  padding: var(--space-4);
  border-radius: var(--radius-base);
  overflow-x: auto;
  border-left: 3px solid var(--color-accent);
}

/* --------------------------------------------
   4. UTILITIES
   -------------------------------------------- */

/* Container */
.container {
  width: 100%;
  max-width: 1280px;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

@media (min-width: 640px) {
  .container {
    padding-left: var(--space-6);
    padding-right: var(--space-6);
  }
}

@media (min-width: 1024px) {
  .container {
    padding-left: var(--space-8);
    padding-right: var(--space-8);
  }
}

/* Flex Utilities */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-end { justify-content: flex-end; }
.flex-1 { flex: 1 1 0%; }
.gap-2 { gap: var(--space-2); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }
.gap-12 { gap: var(--space-12); }

/* Grid Utilities */
.grid { display: grid; }
.grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
.grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

@media (min-width: 768px) {
  .md\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .md\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (min-width: 1024px) {
  .lg\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .lg\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

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

/* --------------------------------------------
   5. COMPONENTS
   -------------------------------------------- */

/* Buttons - Industrial Style */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: var(--radius-base);
  transition: all var(--duration-base) var(--ease-default);
  border: 2px solid transparent;
  cursor: pointer;
  gap: var(--space-2);
}

.btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none !important;
}

.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
  border-color: var(--color-primary);
}

.btn-primary:hover:not(:disabled) {
  background-color: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background-color: var(--color-secondary);
  color: var(--color-text-inverse);
  border-color: var(--color-secondary);
}

.btn-secondary:hover:not(:disabled) {
  background-color: var(--color-secondary-hover);
  border-color: var(--color-secondary-hover);
  transform: translateY(-1px);
}

.btn-accent {
  background-color: var(--color-accent);
  color: var(--color-text-inverse)!important;
  border-color: var(--color-accent);
}

.btn-accent:hover:not(:disabled) {
  background-color: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

.btn-outline {
  background-color: #fff;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-outline:hover:not(:disabled) {
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
}

/* Inputs & Forms */
.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-text);
  background-color: var(--color-background);
  border: 2px solid var(--gray-300);
  border-radius: var(--radius-base);
  transition: border-color var(--duration-fast) var(--ease-default), box-shadow var(--duration-fast) var(--ease-default);
}

.form-input:hover,
.form-select:hover,
.form-textarea:hover {
  border-color: var(--gray-400);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-light);
}

.form-input:disabled,
.form-select:disabled,
.form-textarea:disabled {
  background-color: var(--gray-100);
  cursor: not-allowed;
  opacity: 0.7;
}

.form-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-2);
  text-transform: uppercase;
  letter-spacing: 0.025em;
}

.form-group {
  margin-bottom: var(--space-4);
}

/* Cards - Technical/Organized */
.card {
  background-color: var(--color-background);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--duration-base) var(--ease-default), transform var(--duration-base) var(--ease-default);
}

.card:hover {
  box-shadow: var(--shadow-md);
}

.card-header {
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-4);
  border-bottom: 2px solid var(--gray-200);
}

.card-title {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  margin: 0;
}

.card-body {
  color: var(--color-text-secondary);
}

.card-footer {
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--gray-200);
}

/* Price/Technical Highlight */
.tech-highlight {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--color-accent);
}

/* --------------------------------------------
   6. ACCESSIBILITY
   -------------------------------------------- */

/* Focus Visible - High Contrast Industrial */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
  :root {
    --color-text: #000000;
    --color-background: #FFFFFF;
    --color-primary: #000000;
    --color-accent: #FF0000;
  }
  
  .btn,
  .card,
  .form-input {
    border-width: 2px;
  }
}

/* Print Styles */
@media print {
  body {
    background: white;
    color: black;
  }
  
  .no-print {
    display: none !important;
  }
  
  a[href]::after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
    color: var(--gray-600);
  }
}