/**
 * Equalaw UI Components & Design System
 * Responsive-first component library with language awareness
 *
 * Sections:
 * 1. Color & Spacing System
 * 2. Typography System
 * 3. Button Components (primary, secondary, ghost)
 * 4. Input Components
 * 5. Form States (error, success, disabled)
 * 6. Toast & Notifications
 * 7. Language Picker (floating)
 * 8. Voice Button & Recording Feedback
 * 9. Loading States & Spinners
 * 10. Responsive Breakpoints
 * 11. Accessibility & Focus States
 */

/* ============================================
   1. COLOR & SPACING SYSTEM
   ============================================ */

:root {
  /* Brand Colors */
  --color-primary: #007bff;
  --color-primary-dark: #0061cc;
  --color-primary-light: #389fff;

  /* Semantic Colors */
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  --color-info: #3b82f6;

  /* Neutral */
  --color-white: #ffffff;
  --color-black: #000000;
  --color-gray-50: #f8fafc;
  --color-gray-100: #f1f5f9;
  --color-gray-200: #e2e8f0;
  --color-gray-400: #cbd5e1;
  --color-gray-600: #64748b;
  --color-gray-700: #475569;
  --color-gray-800: #1e293b;
  --color-gray-900: #0f172a;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 999px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;
}

/* ============================================
   2. TYPOGRAPHY SYSTEM
   ============================================ */

h1 { font-size: 3.75rem; font-weight: 800; line-height: 1.1; }
h2 { font-size: 2rem; font-weight: 700; line-height: 1.2; }
h3 { font-size: 1.5rem; font-weight: 600; line-height: 1.3; }
h4 { font-size: 1.25rem; font-weight: 600; line-height: 1.4; }

body, button, input, label {
  font-family: 'Outfit', system-ui, sans-serif;
}

.text-lg { font-size: 1.125rem; font-weight: 500; }
.text-base { font-size: 1rem; font-weight: 400; }
.text-sm { font-size: 0.875rem; font-weight: 500; }
.text-xs { font-size: 0.75rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; }

.font-bold { font-weight: 700; }
.font-semibold { font-weight: 600; }
.font-medium { font-weight: 500; }
.font-regular { font-weight: 400; }

/* ============================================
   3. BUTTON COMPONENTS
   ============================================ */

/* Base button styles */
button, .btn {
  font-family: 'Outfit', sans-serif;
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  white-space: nowrap;
  user-select: none;
}

/* Button Sizes */
.btn-xs {
  padding: 0.375rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: var(--radius-md);
}

.btn-md {
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
}

.btn-lg {
  padding: 1rem 2rem;
  font-size: 1.125rem;
  font-weight: 600;
  border-radius: var(--radius-lg);
}

/* Primary Button */
.btn-primary, .btn-primary:visited {
  background: var(--color-primary);
  color: var(--color-white);
  box-shadow: 0 4px 12px rgba(0, 123, 255, 0.3);
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  box-shadow: 0 6px 16px rgba(0, 123, 255, 0.4);
  transform: translateY(-1px);
}

.btn-primary:active {
  transform: scale(0.98);
  box-shadow: 0 2px 8px rgba(0, 123, 255, 0.2);
}

/* Secondary Button */
.btn-secondary, .btn-secondary:visited {
  background: var(--color-gray-100);
  color: var(--color-gray-800);
  border: 1px solid var(--color-gray-200);
}

.btn-secondary:hover {
  background: var(--color-gray-200);
  color: var(--color-gray-900);
  border-color: var(--color-gray-300);
  transform: translateY(-1px);
}

.btn-secondary:active {
  transform: scale(0.98);
}

/* Ghost Button (text-only) */
.btn-ghost, .btn-ghost:visited {
  background: transparent;
  color: var(--color-primary);
  border: none;
  padding: 0;
}

.btn-ghost:hover {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

/* Button States */
.btn:disabled, .btn[disabled] {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

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

.btn.loading::after {
  content: '';
  position: absolute;
  width: 1em;
  height: 1em;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: spinner 0.6s linear infinite;
}

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

/* ============================================
   4. INPUT COMPONENTS
   ============================================ */

input[type="text"],
input[type="email"],
input[type="tel"],
input[type="password"],
input[type="number"],
textarea,
select {
  font-family: 'Outfit', sans-serif;
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  font-size: 1rem;
  transition: all var(--transition-base);
  background: var(--color-white);
  color: var(--color-gray-800);
  min-height: 44px; /* Touch target */
}

input::placeholder,
textarea::placeholder {
  color: var(--color-gray-600);
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="tel"]:focus,
input[type="password"]:focus,
input[type="number"]:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.1);
  background: var(--color-white);
}

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

select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%23475569' d='M1 1l5 5 5-5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  padding-right: 2.5rem;
}

/* ============================================
   5. FORM STATES
   ============================================ */

.form-group {
  margin-bottom: var(--space-lg);
  display: flex;
  flex-direction: column;
}

.form-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-gray-800);
  margin-bottom: var(--space-sm);
}

.form-help {
  font-size: 0.75rem;
  color: var(--color-gray-600);
  margin-top: var(--space-sm);
  line-height: 1.4;
}

/* Error State */
input[aria-invalid="true"],
textarea[aria-invalid="true"],
.input-error {
  border-color: var(--color-error);
}

input[aria-invalid="true"]:focus,
textarea[aria-invalid="true"]:focus {
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.error-text {
  font-size: 0.75rem;
  color: var(--color-error);
  margin-top: var(--space-sm);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  animation: slideDown 0.2s ease-out;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Success State */
.input-success {
  border-color: var(--color-success);
}

.input-success::after {
  content: '✓';
  position: absolute;
  right: 1rem;
  color: var(--color-success);
  font-weight: 700;
}

.success-text {
  font-size: 0.75rem;
  color: var(--color-success);
  margin-top: var(--space-sm);
}

/* ============================================
   6. TOAST & NOTIFICATIONS
   ============================================ */

.toast {
  position: fixed;
  z-index: 1000;
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-lg);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
  display: flex;
  align-items: center;
  gap: var(--space-md);
  max-width: 400px;
  animation: slideInRight 0.3s ease-out;
}

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

.toast-success {
  background: var(--color-success);
  color: var(--color-white);
}

.toast-error {
  background: var(--color-error);
  color: var(--color-white);
}

.toast-info {
  background: var(--color-info);
  color: var(--color-white);
}

.toast-warning {
  background: var(--color-warning);
  color: var(--color-gray-900);
}

.toast-content {
  flex: 1;
  font-size: 0.875rem;
  font-weight: 500;
  line-height: 1.4;
}

.toast-icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
}

/* ============================================
   7. LANGUAGE PICKER (Floating)
   ============================================ */

#lang-picker {
  position: fixed;
  bottom: var(--space-lg);
  right: var(--space-lg);
  z-index: 50;
  font-family: 'Outfit', sans-serif;
}

#lang-toggle {
  background: var(--color-white);
  color: var(--color-gray-800);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-full);
  padding: var(--space-sm) var(--space-md);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  transition: all var(--transition-base);
  min-height: 44px;
}

#lang-toggle:hover {
  background: var(--color-gray-50);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.12);
  transform: translateY(-2px);
  border-color: var(--color-primary);
}

#lang-toggle:active {
  transform: translateY(0);
}

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

#lang-dropdown {
  position: absolute;
  bottom: 100%;
  right: 0;
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
  overflow: hidden;
  min-width: 160px;
  margin-bottom: var(--space-sm);
  display: none;
  animation: slideUp 0.2s ease-out;
}

#lang-dropdown.open {
  display: block;
}

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

#lang-dropdown button {
  display: block;
  width: 100%;
  padding: var(--space-md) var(--space-lg);
  text-align: left;
  border: none;
  background: var(--color-white);
  color: var(--color-gray-700);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: 'Outfit', sans-serif;
}

#lang-dropdown button:hover {
  background: var(--color-gray-50);
  color: var(--color-primary);
}

#lang-dropdown button[selected],
#lang-dropdown button.active {
  background: #eff6ff;
  color: var(--color-primary);
  font-weight: 600;
}

#lang-dropdown button[selected]::after,
#lang-dropdown button.active::after {
  content: ' ✓';
  color: var(--color-success);
}

/* ============================================
   8. VOICE BUTTON & RECORDING FEEDBACK
   ============================================ */

.voice-btn {
  background: var(--color-white);
  color: var(--color-gray-800);
  border: 1px solid var(--color-gray-200);
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-base);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: 'Outfit', sans-serif;
  min-height: 44px;
}

.voice-btn:hover {
  background: var(--color-gray-50);
  border-color: var(--color-gray-300);
  transform: translateY(-1px);
}

.voice-btn:active {
  transform: scale(0.98);
}

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

/* Recording State */
.voice-btn.recording {
  background: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary-dark);
  animation: pulse 1s infinite;
}

@keyframes pulse {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(0, 123, 255, 0.4);
  }
  50% {
    box-shadow: 0 0 0 8px rgba(0, 123, 255, 0);
  }
}

/* Waveform Visualization */
.voice-waveform {
  display: flex;
  align-items: flex-end;
  gap: 2px;
  height: 24px;
}

.voice-waveform__bar {
  width: 3px;
  background: currentColor;
  border-radius: 2px;
  animation: wave 0.4s ease-in-out infinite;
}

.voice-waveform__bar:nth-child(1) { animation-delay: 0s; }
.voice-waveform__bar:nth-child(2) { animation-delay: 0.1s; }
.voice-waveform__bar:nth-child(3) { animation-delay: 0.2s; }
.voice-waveform__bar:nth-child(4) { animation-delay: 0.3s; }
.voice-waveform__bar:nth-child(5) { animation-delay: 0.4s; }

@keyframes wave {
  0%, 100% { height: 6px; }
  50% { height: 20px; }
}

/* ============================================
   9. LOADING STATES & SPINNERS
   ============================================ */

.skeleton {
  background: linear-gradient(90deg, var(--color-gray-100) 0%, var(--color-gray-200) 50%, var(--color-gray-100) 100%);
  background-size: 200% 100%;
  animation: shimmer 2s infinite;
  border-radius: var(--radius-md);
}

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid var(--color-gray-200);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* ============================================
   10. BADGES & TAGS
   ============================================ */

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.375rem 0.75rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge-info {
  background: #dbeafe;
  color: #1e40af;
}

.badge-success {
  background: #dcfce7;
  color: #15803d;
}

.badge-error {
  background: #fee2e2;
  color: #991b1b;
}

.badge-warning {
  background: #fef3c7;
  color: #92400e;
}

/* ============================================
   11. RESPONSIVE BREAKPOINTS
   ============================================ */

/* Mobile: < 640px */
@media (max-width: 639px) {
  h1 { font-size: 2rem; }
  h2 { font-size: 1.5rem; }
  h3 { font-size: 1.25rem; }

  .btn-lg { padding: 0.875rem 1.5rem; font-size: 1rem; }

  input[type="text"],
  input[type="email"],
  input[type="tel"],
  textarea {
    font-size: 16px; /* Prevent zoom on iOS */
  }

  /* Floating language picker → full-width on small screens */
  #lang-picker {
    bottom: var(--space-md);
    right: var(--space-md);
    left: var(--space-md);
    width: auto;
  }

  #lang-toggle {
    width: 100%;
    justify-content: center;
  }

  #lang-dropdown {
    position: fixed;
    bottom: auto;
    top: 50%;
    left: 50%;
    right: auto;
    width: 90vw;
    max-width: 360px;
    transform: translate(-50%, -50%);
    margin: 0;
  }

  /* Toast on mobile: full-width */
  .toast {
    left: var(--space-md);
    right: var(--space-md);
    bottom: var(--space-md);
    max-width: none;
  }

  /* Form inputs: full-width */
  .form-group input,
  .form-group textarea,
  .form-group select {
    width: 100%;
  }
}

/* Tablet: 640px - 1024px */
@media (min-width: 640px) and (max-width: 1023px) {
  h1 { font-size: 2.5rem; }

  .container { max-width: 640px; }
}

/* Desktop: >= 1024px */
@media (min-width: 1024px) {
  /* Default styles already optimized for desktop */
}

/* ============================================
   12. ACCESSIBILITY & FOCUS STATES
   ============================================ */

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

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* High contrast mode */
@media (prefers-contrast: more) {
  button, input, select {
    border-width: 2px;
  }
}

/* Dark mode support (optional future enhancement) */
@media (prefers-color-scheme: dark) {
  /* Can add dark theme here later */
}