/* ============================================
   UNIFIED BUTTON SYSTEM - v234
   Consistent, accessible, brand-compliant buttons
   WCAG 2.1 AA Compliant (4.5:1+ contrast)
   ============================================ */

/* CSS Variables for Easy Maintenance */
:root {
  /* Primary Brand Colors */
  --btn-primary-start: #667eea;
  --btn-primary-end: #764ba2;
  --btn-primary-hover-start: #5568d3;
  --btn-primary-hover-end: #6a3f8f;
  
  /* AI/Premium Colors */
  --btn-ai-start: #8b5cf6;
  --btn-ai-end: #6366f1;
  --btn-ai-hover-start: #7c3aed;
  --btn-ai-hover-end: #4f46e5;
  
  /* Semantic Colors */
  --btn-danger: #ef4444;
  --btn-danger-hover: #dc2626;
  --btn-success: #10b981;
  --btn-success-hover: #059669;
  
  /* Neutral Colors */
  --btn-text-white: #ffffff;
  --btn-text-dark: #1f2937;
  --btn-border: #e5e7eb;
  --btn-bg-light: #f9fafb;
}

/* ============================================
   BASE BUTTON STYLES
   ============================================ */

.btn,
button[class*="btn-"],
a[class*="btn-"] {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 8px;
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1.5;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  border: none;
  white-space: nowrap;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

/* ============================================
   PRIMARY BUTTONS (Main CTAs)
   Usage: Sign up, Login, Submit, Save, Upgrade
   ============================================ */

.btn-primary {
  background: linear-gradient(135deg, var(--btn-primary-start) 0%, var(--btn-primary-end) 100%);
  color: var(--btn-text-white);
  border: none;
  box-shadow: 0 2px 8px rgba(102, 126, 234, 0.3);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--btn-primary-hover-start) 0%, var(--btn-primary-hover-end) 100%);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(102, 126, 234, 0.4);
}

.btn-primary:active {
  transform: translateY(0);
  box-shadow: 0 2px 8px rgba(102, 126, 234, 0.3);
}

.btn-primary:focus-visible {
  outline: 3px solid rgba(102, 126, 234, 0.5);
  outline-offset: 2px;
}

.btn-primary:disabled {
  background: #d1d5db;
  color: #9ca3af;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
  pointer-events: none;
}

/* ============================================
   SECONDARY BUTTONS (Alternative Actions)
   Usage: Cancel, Back, Skip, Guest Access
   ============================================ */

.btn-secondary {
  background: white;
  color: var(--btn-primary-start);
  border: 2px solid var(--btn-primary-start);
}

.btn-secondary:hover {
  background: var(--btn-bg-light);
  border-color: var(--btn-primary-hover-start);
  color: var(--btn-primary-hover-start);
  transform: translateY(-1px);
}

.btn-secondary:active {
  transform: translateY(0);
}

.btn-secondary:focus-visible {
  outline: 3px solid rgba(102, 126, 234, 0.5);
  outline-offset: 2px;
}

.btn-secondary:disabled {
  background: white;
  color: #d1d5db;
  border-color: #d1d5db;
  cursor: not-allowed;
  transform: none;
  pointer-events: none;
}

/* ============================================
   DANGER/DESTRUCTIVE BUTTONS
   Usage: Delete, Logout, Clear, Remove
   ============================================ */

.btn-danger {
  background: white;
  color: var(--btn-danger);
  border: 2px solid var(--btn-danger);
}

.btn-danger:hover {
  background: var(--btn-danger);
  color: white;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(239, 68, 68, 0.3);
}

.btn-danger:active {
  transform: translateY(0);
  box-shadow: 0 2px 6px rgba(239, 68, 68, 0.3);
}

.btn-danger:focus-visible {
  outline: 3px solid rgba(239, 68, 68, 0.5);
  outline-offset: 2px;
}

.btn-danger:disabled {
  background: white;
  color: #fca5a5;
  border-color: #fca5a5;
  cursor: not-allowed;
  transform: none;
  pointer-events: none;
}

/* ============================================
   AI/PREMIUM BUTTONS
   Usage: AI features, Premium actions
   ============================================ */

.btn-ai {
  background: linear-gradient(135deg, var(--btn-ai-start) 0%, var(--btn-ai-end) 100%);
  color: var(--btn-text-white);
  border: none;
  box-shadow: 0 2px 8px rgba(139, 92, 246, 0.3);
}

.btn-ai:hover {
  background: linear-gradient(135deg, var(--btn-ai-hover-start) 0%, var(--btn-ai-hover-end) 100%);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(139, 92, 246, 0.4);
}

.btn-ai:active {
  transform: translateY(0);
  box-shadow: 0 2px 8px rgba(139, 92, 246, 0.3);
}

.btn-ai:focus-visible {
  outline: 3px solid rgba(139, 92, 246, 0.5);
  outline-offset: 2px;
}

/* ============================================
   SUCCESS BUTTONS
   Usage: Confirm, Approve, Complete
   ============================================ */

.btn-success {
  background: var(--btn-success);
  color: white;
  border: none;
  box-shadow: 0 2px 8px rgba(16, 185, 129, 0.3);
}

.btn-success:hover {
  background: var(--btn-success-hover);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.4);
}

.btn-success:active {
  transform: translateY(0);
}

.btn-success:focus-visible {
  outline: 3px solid rgba(16, 185, 129, 0.5);
  outline-offset: 2px;
}

/* ============================================
   BUTTON SIZES
   ============================================ */

.btn-small,
.btn-sm {
  padding: 8px 16px;
  font-size: 0.875rem;
}

.btn-large,
.btn-lg {
  padding: 16px 32px;
  font-size: 1.125rem;
}

.btn-pill {
  border-radius: 999px;
  padding: 8px 16px;
  font-size: 0.875rem;
}

/* ============================================
   BUTTON VARIANTS
   ============================================ */

/* Ghost/Outline Buttons */
.btn-ghost {
  background: transparent;
  color: var(--btn-text-dark);
  border: 1px solid var(--btn-border);
}

.btn-ghost:hover {
  background: var(--btn-bg-light);
  border-color: #d1d5db;
}

/* Link-style Buttons */
.btn-link {
  background: transparent;
  color: var(--btn-primary-start);
  border: none;
  padding: 4px 8px;
  text-decoration: underline;
}

.btn-link:hover {
  color: var(--btn-primary-hover-start);
  background: transparent;
  transform: none;
}

/* Icon-only Buttons */
.btn-icon {
  padding: 8px;
  width: 40px;
  height: 40px;
  border-radius: 8px;
}

.btn-icon.btn-small {
  width: 32px;
  height: 32px;
  padding: 6px;
}

.btn-icon.btn-large {
  width: 48px;
  height: 48px;
  padding: 12px;
}

/* ============================================
   BUTTON GROUPS
   ============================================ */

.btn-group {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.btn-group-compact {
  gap: 8px;
}

.btn-group-vertical {
  flex-direction: column;
}

/* ============================================
   LOADING STATE
   ============================================ */

.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 transparent;
  border-top-color: currentColor;
  border-radius: 50%;
  animation: btn-spin 0.6s linear infinite;
}

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

/* ============================================
   ACCESSIBILITY ENHANCEMENTS
   ============================================ */

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
  .btn-primary,
  .btn-ai,
  .btn-success {
    border: 2px solid currentColor;
  }
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
  .btn,
  button[class*="btn-"],
  a[class*="btn-"] {
    transition: none;
    animation: none;
  }
  
  .btn:hover,
  button[class*="btn-"]:hover,
  a[class*="btn-"]:hover {
    transform: none;
  }
}

/* Focus Visible for Keyboard Navigation */
.btn:focus:not(:focus-visible) {
  outline: none;
}

/* ============================================
   MOBILE OPTIMIZATIONS
   ============================================ */

@media (max-width: 768px) {
  .btn,
  button[class*="btn-"],
  a[class*="btn-"] {
    padding: 10px 20px;
    font-size: 0.875rem;
  }
  
  .btn-large,
  .btn-lg {
    padding: 14px 28px;
    font-size: 1rem;
  }
  
  .btn-small,
  .btn-sm {
    padding: 6px 12px;
    font-size: 0.8125rem;
  }
  
  /* Full-width buttons on mobile */
  .btn-mobile-full {
    width: 100%;
  }
  
  .btn-group {
    width: 100%;
  }
  
  .btn-group > * {
    flex: 1;
  }
}

/* ============================================
   LEGACY COMPATIBILITY
   Maintain backwards compatibility with existing classes
   ============================================ */

/* Pricing page buttons */
.plan-button.primary {
  background: linear-gradient(135deg, var(--btn-primary-start) 0%, var(--btn-primary-end) 100%);
  color: white;
  border-color: var(--btn-primary-start);
}

.plan-button.primary:hover {
  background: linear-gradient(135deg, var(--btn-primary-hover-start) 0%, var(--btn-primary-hover-end) 100%);
  border-color: var(--btn-primary-hover-start);
}

/* Job card buttons */
.job-action-btn-compact.preview-btn,
.modal-btn-primary {
  background: linear-gradient(135deg, var(--btn-primary-start) 0%, var(--btn-primary-end) 100%);
  color: white;
  border-color: var(--btn-primary-start);
}

.job-action-btn-compact.preview-btn:hover,
.modal-btn-primary:hover {
  background: linear-gradient(135deg, var(--btn-primary-hover-start) 0%, var(--btn-primary-hover-end) 100%);
}

/* Role badges */
.role-badge {
  background: linear-gradient(135deg, var(--btn-primary-start) 0%, var(--btn-primary-end) 100%);
  color: white;
}

/* Search buttons */
.search-btn-primary {
  background: linear-gradient(135deg, var(--btn-primary-start) 0%, var(--btn-primary-end) 100%);
  color: white;
}

.search-btn-primary:hover {
  background: linear-gradient(135deg, var(--btn-primary-hover-start) 0%, var(--btn-primary-hover-end) 100%);
}

.clear-btn-secondary {
  background: white;
  color: var(--btn-danger);
  border: 2px solid var(--btn-danger);
}

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

/* Navigation CTA */
.nav-cta {
  background: linear-gradient(135deg, var(--btn-primary-start) 0%, var(--btn-primary-end) 100%);
  color: white;
  box-shadow: 0 2px 8px rgba(102, 126, 234, 0.3);
}

.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(102, 126, 234, 0.4);
}

/* Auth buttons */
.btn-primary-compact {
  background: linear-gradient(135deg, var(--btn-primary-start) 0%, var(--btn-primary-end) 100%);
  color: white;
  padding: 10px 20px;
  font-size: 0.875rem;
}

.btn-secondary-action {
  background: white;
  color: var(--btn-primary-start);
  border: 2px solid var(--btn-primary-start);
}

.btn-secondary-action:hover {
  background: var(--btn-bg-light);
  color: var(--btn-primary-hover-start);
  border-color: var(--btn-primary-hover-start);
}

/* ============================================
   PRINT STYLES
   ============================================ */

@media print {
  .btn,
  button[class*="btn-"],
  a[class*="btn-"] {
    border: 1px solid #000;
    box-shadow: none;
    background: white !important;
    color: #000 !important;
  }
}

/* ============================================
   JOB CARD SAVE & APPLY BUTTONS - WHITE BG
   ============================================ */

/* Save button - white background with border */
.btn-pill:not(.btn-primary-action):not(.saved) {
  background: white !important;
  color: #667eea !important;
  border: 2px solid #667eea !important;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1) !important;
}

.btn-pill:not(.btn-primary-action):not(.saved):hover {
  background: #f8f9ff !important;
  border-color: #5568d3 !important;
  color: #5568d3 !important;
  transform: translateY(-1px);
}

/* Apply button - white background with purple border to match Save */
.btn-pill.btn-primary-action {
  background: white !important;
  color: #667eea !important;
  border: 2px solid #667eea !important;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1) !important;
}

.btn-pill.btn-primary-action:hover {
  background: #f8f9ff !important;
  border-color: #5568d3 !important;
  color: #5568d3 !important;
  transform: translateY(-1px);
}

/* Saved state - keep green */
.btn-pill.saved {
  background: #10b981 !important;
  color: white !important;
  border: 2px solid #10b981 !important;
  cursor: default !important;
}

/* Disabled state */
.btn-pill:disabled {
  background: #f3f4f6 !important;
  color: #9ca3af !important;
  border-color: #e5e7eb !important;
  cursor: not-allowed !important;
  transform: none !important;
}

/* AI Assist button - purple gradient for better visibility */
.btn-pill.btn-menu {
  background: linear-gradient(135deg, #8b5cf6 0%, #6366f1 100%) !important;
  color: white !important;
  border: 2px solid #8b5cf6 !important;
  box-shadow: 0 2px 8px rgba(139, 92, 246, 0.3) !important;
}

.btn-pill.btn-menu:hover {
  background: linear-gradient(135deg, #7c3aed 0%, #4f46e5 100%) !important;
  border-color: #7c3aed !important;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(139, 92, 246, 0.4) !important;
}

/* Pro badge styling */
.btn-pro-badge {
  background: rgba(255, 255, 255, 0.3) !important;
  padding: 2px 6px !important;
  border-radius: 4px !important;
  font-size: 0.7rem !important;
  font-weight: 700 !important;
  margin-left: 4px !important;
}