/* ============================================
   BARTEREX MODERN DESIGN SYSTEM
   Foundation for responsive, beautiful UI
   ============================================ */

/* ============================================
   1. CSS CUSTOM PROPERTIES (VARIABLES)
   ============================================ */

:root {
  /* -------- SPACING SCALE -------- */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  --spacing-3xl: 64px;

  /* -------- TYPOGRAPHY -------- */
  /* Font families */
  --font-family-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-family-secondary: 'Space Grotesk', 'Inter', sans-serif;
  --font-family-mono: 'Fira Code', monospace;

  /* Font sizes */
  --text-xs: 11px;
  --text-sm: 12px;
  --text-base: 14px;
  --text-lg: 15px;
  --text-xl: 17px;
  --text-2xl: 20px;
  --text-3xl: 26px;
  --text-4xl: 32px;

  /* Line heights */
  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;
  --line-height-loose: 2;

  /* Font weights */
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;

  /* -------- COLORS - BRAND -------- */
  --color-primary: #054e97;           /* Blue */
  --color-primary-light: #0d5fa8;
  --color-primary-lighter: #1a7bc4;
  --color-primary-dark: #043a72;
  --color-primary-darker: #021f3d;

  --color-secondary: #ff7a00;         /* Orange */
  --color-secondary-light: #ff8c26;
  --color-secondary-lighter: #ffaa57;
  --color-secondary-dark: #cc6300;
  --color-secondary-darker: #994700;

  /* -------- COLORS - STATUS -------- */
  --color-success: #10b981;
  --color-success-light: #6ee7b7;
  --color-success-dark: #059669;

  --color-warning: #f59e0b;
  --color-warning-light: #fcd34d;
  --color-warning-dark: #d97706;

  --color-error: #ef4444;
  --color-error-light: #fca5a5;
  --color-error-dark: #991b1b;

  --color-info: #3b82f6;
  --color-info-light: #93c5fd;
  --color-info-dark: #1e40af;

  /* -------- COLORS - NEUTRAL -------- */
  --color-white: #ffffff;
  --color-black: #000000;

  --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;

  /* -------- COLORS - SEMANTIC -------- */
  --color-text-primary: #111827;
  --color-text-secondary: #6b7280;
  --color-text-tertiary: #9ca3af;
  --color-text-inverse: #ffffff;

  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f9fafb;
  --color-bg-tertiary: #f3f4f6;

  --color-border: #e5e7eb;
  --color-border-light: #f3f4f6;
  --color-border-dark: #d1d5db;

  /* -------- BORDER RADIUS -------- */
  --radius-none: 0;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-2xl: 20px;
  --radius-full: 9999px;

  /* -------- SHADOWS -------- */
  --shadow-none: none;
  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

  /* -------- INTERACTIVE ELEMENTS -------- */
  --touch-target: 44px;
  --touch-target-sm: 36px;

  /* -------- TRANSITIONS -------- */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;
  --transition-slower: 500ms ease;

  /* -------- BREAKPOINTS -------- */
  /* Defined in media queries below */
}

/* Tablet and larger screens - adjust typography */
@media (min-width: 768px) {
  :root {
    --text-2xl: 23px;
    --text-3xl: 30px;
    --text-4xl: 40px;
  }
}

/* ============================================
   2. GLOBAL STYLES
   ============================================ */

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family-primary);
  font-size: var(--text-base);
  line-height: var(--line-height-normal);
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  overflow-x: hidden;
  min-height: 100vh;
}

/* ============================================
   3. TYPOGRAPHY
   ============================================ */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-family-secondary);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  margin-bottom: var(--spacing-md);
}

h1 {
  font-size: var(--text-3xl);
}

h2 {
  font-size: var(--text-2xl);
}

h3 {
  font-size: var(--text-xl);
}

h4 {
  font-size: var(--text-lg);
}

h5 {
  font-size: var(--text-base);
}

h6 {
  font-size: var(--text-sm);
}

p {
  margin-bottom: var(--spacing-md);
  line-height: var(--line-height-relaxed);
}

small {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

/* ============================================
   4. UTILITY CLASSES - SPACING
   ============================================ */

.p-0 { padding: 0; }
.p-xs { padding: var(--spacing-xs); }
.p-sm { padding: var(--spacing-sm); }
.p-md { padding: var(--spacing-md); }
.p-lg { padding: var(--spacing-lg); }
.p-xl { padding: var(--spacing-xl); }

.px-0 { padding-left: 0; padding-right: 0; }
.px-xs { padding-left: var(--spacing-xs); padding-right: var(--spacing-xs); }
.px-sm { padding-left: var(--spacing-sm); padding-right: var(--spacing-sm); }
.px-md { padding-left: var(--spacing-md); padding-right: var(--spacing-md); }
.px-lg { padding-left: var(--spacing-lg); padding-right: var(--spacing-lg); }
.px-xl { padding-left: var(--spacing-xl); padding-right: var(--spacing-xl); }

.py-0 { padding-top: 0; padding-bottom: 0; }
.py-xs { padding-top: var(--spacing-xs); padding-bottom: var(--spacing-xs); }
.py-sm { padding-top: var(--spacing-sm); padding-bottom: var(--spacing-sm); }
.py-md { padding-top: var(--spacing-md); padding-bottom: var(--spacing-md); }
.py-lg { padding-top: var(--spacing-lg); padding-bottom: var(--spacing-lg); }
.py-xl { padding-top: var(--spacing-xl); padding-bottom: var(--spacing-xl); }

.m-0 { margin: 0; }
.m-xs { margin: var(--spacing-xs); }
.m-sm { margin: var(--spacing-sm); }
.m-md { margin: var(--spacing-md); }
.m-lg { margin: var(--spacing-lg); }
.m-xl { margin: var(--spacing-xl); }

.gap-xs { gap: var(--spacing-xs); }
.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }
.gap-xl { gap: var(--spacing-xl); }

/* ============================================
   5. UTILITY CLASSES - LAYOUT
   ============================================ */

.container {
  width: 100%;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--spacing-md);
  padding-right: var(--spacing-md);
}

@media (min-width: 640px) {
  .container {
    max-width: 640px;
    padding-left: var(--spacing-lg);
    padding-right: var(--spacing-lg);
  }
}

@media (min-width: 768px) {
  .container {
    max-width: 768px;
  }
}

@media (min-width: 1024px) {
  .container {
    max-width: 1024px;
  }
}

@media (min-width: 1280px) {
  .container {
    max-width: 1280px;
  }
}

.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-between {
  justify-content: space-between;
}

.justify-center {
  justify-content: center;
}

.justify-start {
  justify-content: flex-start;
}

.justify-end {
  justify-content: flex-end;
}

.grid {
  display: grid;
  gap: var(--spacing-md);
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .grid-2 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }

  .grid-4 {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ============================================
   6. CARDS
   ============================================ */

.card {
  background-color: var(--color-bg-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary-light);
}

.card-sm {
  padding: var(--spacing-md);
}

.card-lg {
  padding: var(--spacing-xl);
}

/* ============================================
   7. BUTTONS
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: var(--text-base);
  font-weight: var(--font-weight-semibold);
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  min-height: var(--touch-target-sm);
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

/* Size variants */
.btn-sm {
  padding: 6px 12px;
  font-size: var(--text-sm);
  min-height: 32px;
}

.btn-md {
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: var(--text-base);
  min-height: var(--touch-target-sm);
}

.btn-lg {
  padding: 12px 24px;
  font-size: var(--text-lg);
  min-height: var(--touch-target);
}

/* Color variants */
.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.btn-primary:hover {
  background-color: var(--color-primary-light);
}

.btn-primary:active {
  background-color: var(--color-primary-dark);
}

.btn-secondary {
  background-color: var(--color-secondary);
  color: var(--color-white);
}

.btn-secondary:hover {
  background-color: var(--color-secondary-light);
}

.btn-secondary:active {
  background-color: var(--color-secondary-dark);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn-outline:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.btn-ghost {
  background-color: transparent;
  color: var(--color-text-primary);
  padding: var(--spacing-sm) var(--spacing-md);
}

.btn-ghost:hover {
  background-color: var(--color-bg-tertiary);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn.loading {
  position: relative;
  color: transparent;
  pointer-events: none;
}

.btn.loading::after {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  top: 50%;
  left: 50%;
  margin-left: -8px;
  margin-top: -8px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: rgba(255, 255, 255, 1);
  animation: spinner 0.6s linear infinite;
}

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

/* ============================================
   8. FORM ELEMENTS
   ============================================ */

.form-group {
  margin-bottom: var(--spacing-lg);
}

label {
  display: block;
  font-size: var(--text-sm);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-primary);
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
input[type="tel"],
input[type="url"],
input[type="date"],
textarea,
select {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--text-base);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background-color: var(--color-white);
  color: var(--color-text-primary);
  transition: all var(--transition-base);
  min-height: var(--touch-target-sm);
  font-family: var(--font-family-primary);
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="password"]:focus,
input[type="number"]:focus,
input[type="tel"]:focus,
input[type="url"]:focus,
input[type="date"]:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(5, 78, 151, 0.1);
}

textarea {
  resize: vertical;
  min-height: 120px;
  line-height: var(--line-height-relaxed);
}

input[type="checkbox"],
input[type="radio"] {
  width: var(--spacing-md);
  height: var(--spacing-md);
  cursor: pointer;
}

.form-error {
  color: var(--color-error);
  font-size: var(--text-sm);
  margin-top: var(--spacing-xs);
}

.form-hint {
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  margin-top: var(--spacing-xs);
}

/* ============================================
   9. ALERTS & NOTIFICATIONS
   ============================================ */

.alert {
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-lg);
  border-left: 4px solid;
  margin-bottom: var(--spacing-md);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.alert-success {
  background-color: rgba(16, 185, 129, 0.1);
  border-color: var(--color-success);
  color: var(--color-success-dark);
}

.alert-warning {
  background-color: rgba(245, 158, 11, 0.1);
  border-color: var(--color-warning);
  color: var(--color-warning-dark);
}

.alert-error {
  background-color: rgba(239, 68, 68, 0.1);
  border-color: var(--color-error);
  color: var(--color-error-dark);
}

.alert-info {
  background-color: rgba(59, 130, 246, 0.1);
  border-color: var(--color-info);
  color: var(--color-info-dark);
}

/* ============================================
   10. TEXT UTILITIES
   ============================================ */

.text-center {
  text-align: center;
}

.text-left {
  text-align: left;
}

.text-right {
  text-align: right;
}

.text-primary {
  color: var(--color-text-primary);
}

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

.text-success {
  color: var(--color-success);
}

.text-warning {
  color: var(--color-warning);
}

.text-error {
  color: var(--color-error);
}

.font-light {
  font-weight: var(--font-weight-light);
}

.font-normal {
  font-weight: var(--font-weight-normal);
}

.font-semibold {
  font-weight: var(--font-weight-semibold);
}

.font-bold {
  font-weight: var(--font-weight-bold);
}

/* ============================================
   11. RESPONSIVE UTILITIES
   ============================================ */

.hidden {
  display: none !important;
}

.visible {
  display: block !important;
}

/* Hide on mobile, show on tablet+ */
@media (max-width: 767px) {
  .hidden-mobile {
    display: none !important;
  }
}

/* Hide on tablet+, show on mobile */
@media (min-width: 768px) {
  .hidden-desktop {
    display: none !important;
  }
}

/* ============================================
   12. RESPONSIVE GRID SYSTEM
   ============================================ */

.grid-auto {
  display: grid;
  gap: var(--spacing-md);
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

@media (max-width: 640px) {
  .grid-auto {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 640px) and (max-width: 1023px) {
  .grid-auto {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .grid-auto {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1280px) {
  .grid-auto {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ============================================
   13. IMAGE UTILITIES
   ============================================ */

img {
  max-width: 100%;
  height: auto;
  display: block;
}

.img-responsive {
  width: 100%;
  height: auto;
}

.img-cover {
  object-fit: cover;
  width: 100%;
  height: 100%;
}

.img-contain {
  object-fit: contain;
  width: 100%;
  height: 100%;
}

/* ============================================
   14. SCROLL BEHAVIOR
   ============================================ */

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg-tertiary);
}

::-webkit-scrollbar-thumb {
  background: var(--color-border-dark);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-gray-400);
}

/* ============================================
   15. FOCUS VISIBLE FOR ACCESSIBILITY
   ============================================ */

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

button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ============================================
   16. MOBILE-FIRST RESPONSIVE ADJUSTMENTS
   ============================================ */

@media (max-width: 640px) {
  body {
    font-size: var(--text-sm);
  }

  h1 {
    font-size: var(--text-2xl);
  }

  .p-lg {
    padding: var(--spacing-md);
  }

  .px-lg {
    padding-left: var(--spacing-md);
    padding-right: var(--spacing-md);
  }
}

@media (min-width: 641px) and (max-width: 1023px) {
  /* Tablet optimizations */
  .grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  /* Desktop optimizations */
  body {
    padding-bottom: 0; /* No bottom nav needed */
  }

  .grid {
    grid-template-columns: repeat(3, 1fr);
  }
}