/* ============================================
 * JO.BTEC - Responsive Design System
 * Mobile-First, Fully Responsive
 * ============================================ */

/* ============================================
 * 1. ROOT & RESET - Base Setup
 * ============================================ */
:root {
  /* Fluid Typography */
  font-size: clamp(14px, 1.2vw + 12px, 18px);
  
  /* Spacing System */
  --spacing-xs: clamp(4px, 1vw, 8px);
  --spacing-sm: clamp(8px, 2vw, 16px);
  --spacing-md: clamp(16px, 3vw, 24px);
  --spacing-lg: clamp(24px, 4vw, 40px);
  --spacing-xl: clamp(40px, 5vw, 64px);
  
  /* Safe Areas (iOS notch) */
  --safe-top: env(safe-area-inset-top, 0);
  --safe-bottom: env(safe-area-inset-bottom, 0);
  --safe-left: env(safe-area-inset-left, 0);
  --safe-right: env(safe-area-inset-right, 0);
  
  /* Breakpoints (for reference) */
  --mobile-small: 320px;
  --mobile: 480px;
  --tablet: 768px;
  --desktop: 1024px;
  --desktop-large: 1280px;
}

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

html {
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif, -apple-system, BlinkMacSystemFont;
  line-height: 1.6;
  padding-top: var(--safe-top);
  padding-bottom: var(--safe-bottom);
  padding-left: var(--safe-left);
  padding-right: var(--safe-right);
  overflow-x: hidden;
}

/* ============================================
 * 2. CONTAINER SYSTEM - Mobile-First
 * ============================================ */
.container {
  width: 100%;
  padding-left: var(--spacing-sm);
  padding-right: var(--spacing-sm);
  margin: 0 auto;
}

@media (min-width: 768px) {
  .container {
    padding-left: var(--spacing-md);
    padding-right: var(--spacing-md);
    max-width: 720px;
  }
}

@media (min-width: 1024px) {
  .container {
    max-width: 960px;
    padding-left: var(--spacing-lg);
    padding-right: var(--spacing-lg);
  }
}

@media (min-width: 1280px) {
  .container {
    max-width: 1200px;
  }
}

/* ============================================
 * 3. CARD SYSTEM - Responsive Cards
 * ============================================ */
.card {
  background: white;
  border-radius: clamp(8px, 2vw, 16px);
  padding: var(--spacing-md);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  margin-bottom: var(--spacing-md);
  transition: transform 0.3s, box-shadow 0.3s;
  container-type: inline-size;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.15);
}

@media (min-width: 768px) {
  .card {
    padding: var(--spacing-lg);
  }
}

/* Card Grid - Auto-responsive */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-md);
  width: 100%;
}

@media (min-width: 768px) {
  .card-grid {
    gap: var(--spacing-lg);
  }
}

/* ============================================
 * 4. BUTTON SYSTEM - Touch-Friendly
 * ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  padding: clamp(12px, 2vw, 16px) clamp(20px, 3vw, 32px);
  border-radius: clamp(8px, 1.5vw, 12px);
  border: none;
  cursor: pointer;
  font-size: clamp(14px, 1.5vw, 16px);
  font-weight: 600;
  transition: all 0.3s;
  min-height: 44px; /* Touch target size */
  min-width: 44px;
  text-align: center;
  white-space: nowrap;
}

.btn:active {
  transform: scale(0.96);
}

.btn-primary {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
}

.btn-primary:hover {
  box-shadow: 0 4px 16px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
  background: #f3f4f6;
  color: #374151;
}

.btn-secondary:hover {
  background: #e5e7eb;
}

/* ============================================
 * 5. NAVIGATION - Responsive Menu
 * ============================================ */
.main-menu-button {
  position: fixed;
  top: calc(var(--spacing-sm) + var(--safe-top));
  left: calc(var(--spacing-sm) + var(--safe-left));
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: 14px;
  border-radius: 12px;
  cursor: pointer;
  z-index: 1000;
  box-shadow: 0 4px 16px rgba(102, 126, 234, 0.4);
  transition: all 0.3s;
  border: none;
  font-size: 20px;
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
}

@media (min-width: 768px) {
  .main-menu-button {
    width: 60px;
    height: 60px;
    font-size: 24px;
  }
}

.dropdown-menu {
  display: none;
  position: fixed;
  top: calc(var(--spacing-sm) + 70px + var(--safe-top));
  left: calc(var(--spacing-sm) + var(--safe-left));
  background: white;
  border-radius: 16px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
  z-index: 999;
  min-width: 250px;
  max-width: calc(100vw - var(--spacing-sm) * 2);
  animation: slideDown 0.3s ease-out;
}

@media (min-width: 768px) {
  .dropdown-menu {
    min-width: 300px;
  }
}

.dropdown-menu.show {
  display: block;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.dropdown-item {
  padding: clamp(12px, 2vw, 16px) clamp(16px, 3vw, 24px);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  border: none;
  width: 100%;
  background: white;
  color: #2d3748;
  font-size: clamp(14px, 1.5vw, 16px);
  border-bottom: 1px solid #e2e8f0;
  transition: background 0.2s;
  min-height: 44px; /* Touch target */
}

.dropdown-item:hover {
  background: #f7fafc;
}

.dropdown-item:last-child {
  border-bottom: none;
}

/* ============================================
 * 6. FORMS - Responsive Inputs
 * ============================================ */
.form-group {
  margin-bottom: var(--spacing-md);
  width: 100%;
}

.form-label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-weight: 600;
  font-size: clamp(14px, 1.5vw, 16px);
  color: #374151;
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: clamp(10px, 2vw, 14px) clamp(12px, 2.5vw, 16px);
  border: 2px solid #e5e7eb;
  border-radius: clamp(8px, 1.5vw, 12px);
  font-size: clamp(14px, 1.5vw, 16px);
  transition: all 0.3s;
  background: white;
  min-height: 44px; /* Touch target */
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: #667eea;
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

/* ============================================
 * 7. IMAGES & MEDIA - Responsive
 * ============================================ */
img {
  max-width: 100%;
  height: auto;
  display: block;
}

.logo {
  width: clamp(60px, 15vw, 120px);
  height: auto;
}

/* ============================================
 * 8. TYPOGRAPHY - Fluid Sizes
 * ============================================ */
h1 {
  font-size: clamp(24px, 5vw, 40px);
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
}

h2 {
  font-size: clamp(20px, 4vw, 32px);
  line-height: 1.3;
  margin-bottom: var(--spacing-md);
}

h3 {
  font-size: clamp(18px, 3vw, 24px);
  line-height: 1.4;
  margin-bottom: var(--spacing-sm);
}

p {
  font-size: clamp(14px, 1.5vw, 16px);
  line-height: 1.6;
  margin-bottom: var(--spacing-sm);
}

/* ============================================
 * 9. UTILITIES - Helper Classes
 * ============================================ */
.text-center {
  text-align: center;
}

.flex {
  display: flex;
}

.flex-col {
  flex-direction: column;
}

.flex-wrap {
  flex-wrap: wrap;
}

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

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

.gap-sm {
  gap: var(--spacing-sm);
}

.gap-md {
  gap: var(--spacing-md);
}

.gap-lg {
  gap: var(--spacing-lg);
}

.mb-sm {
  margin-bottom: var(--spacing-sm);
}

.mb-md {
  margin-bottom: var(--spacing-md);
}

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

.mt-sm {
  margin-top: var(--spacing-sm);
}

.mt-md {
  margin-top: var(--spacing-md);
}

.mt-lg {
  margin-top: var(--spacing-lg);
}

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

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

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

.hidden-mobile {
  display: none;
}

@media (min-width: 768px) {
  .hidden-mobile {
    display: block;
  }
}

.hidden-desktop {
  display: block;
}

@media (min-width: 768px) {
  .hidden-desktop {
    display: none;
  }
}

/* ============================================
 * 10. DARK MODE (Optional)
 * ============================================ */
body.dark-mode {
  background: linear-gradient(135deg, #1a202c 0%, #2d3748 100%);
  color: #f7fafc;
}

body.dark-mode .card {
  background: #2d3748;
  color: #f7fafc;
}

body.dark-mode .form-input,
body.dark-mode .form-select,
body.dark-mode .form-textarea {
  background: #1a202c;
  color: #f7fafc;
  border-color: #4a5568;
}

body.dark-mode .dropdown-menu {
  background: #2d3748;
}

body.dark-mode .dropdown-item {
  background: #2d3748;
  color: #f7fafc;
  border-bottom-color: #4a5568;
}

body.dark-mode .dropdown-item:hover {
  background: #374151;
}

/* ============================================
 * 11. PRINT STYLES
 * ============================================ */
@media print {
  .main-menu-button,
  .dropdown-menu {
    display: none !important;
  }
  
  .card {
    page-break-inside: avoid;
  }
}