/* ═══════════════════════════════════════════════════════════════
   FORM MICRO-INTERACTIONS
   Premium 2026 SaaS-tier input animations
   Inspired by Stripe, Linear, Notion, Anthropic
   ═══════════════════════════════════════════════════════════════ */

/* ═══════════════════════════════════════════════════════════════
   FLOATING LABEL SYSTEM
   ═══════════════════════════════════════════════════════════════ */

.form-group {
  position: relative;
}

.form-group.floating-label label {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  pointer-events: none;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  color: rgba(170, 182, 211, 0.6);
  font-size: 0.95rem;
  font-weight: 500;
  background: transparent;
  padding: 0 4px;
  z-index: 1;
}

/* Textarea floating label needs different positioning */
.form-group.floating-label.has-textarea label {
  top: 20px;
  transform: translateY(0);
}

/* Floated state (when focused or filled) */
.form-group.floating-label.is-focused label,
.form-group.floating-label.is-filled label {
  top: -8px;
  transform: translateY(0);
  font-size: 0.75rem;
  color: var(--accent);
  background: var(--bg);
  font-weight: 600;
}

/* Success state */
.form-group.floating-label.is-valid label {
  color: #10b981;
}

/* Error state */
.form-group.floating-label.is-error label {
  color: #ef4444;
}

/* Hide required/optional spans when floated */
.form-group.floating-label label .required,
.form-group.floating-label label .optional {
  opacity: 1;
  transition: opacity 0.2s;
}

.form-group.floating-label.is-focused label .required,
.form-group.floating-label.is-focused label .optional,
.form-group.floating-label.is-filled label .required,
.form-group.floating-label.is-filled label .optional {
  opacity: 0;
}

/* ═══════════════════════════════════════════════════════════════
   INPUT ENHANCEMENTS
   ═══════════════════════════════════════════════════════════════ */

.form-group input,
.form-group textarea {
  position: relative;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Enhanced focus state with animated border */
.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--accent);
  box-shadow: 
    0 0 0 3px var(--accent-glow),
    0 1px 2px rgba(0, 0, 0, 0.05);
  transform: translateY(-1px);
}

/* Animated focus ring */
.form-group::before {
  content: '';
  position: absolute;
  inset: -2px;
  border-radius: calc(var(--radius-sm) + 2px);
  background: linear-gradient(135deg, var(--accent), var(--secondary));
  opacity: 0;
  z-index: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}

.form-group.is-focused::before {
  opacity: 0.15;
  animation: focusRingPulse 2s ease-in-out infinite;
}

@keyframes focusRingPulse {
  0%, 100% {
    transform: scale(1);
    opacity: 0.15;
  }
  50% {
    transform: scale(1.02);
    opacity: 0.25;
  }
}

/* ═══════════════════════════════════════════════════════════════
   VALIDATION STATES
   ═══════════════════════════════════════════════════════════════ */

/* Success state */
.form-group.is-valid input,
.form-group.is-valid textarea {
  border-color: #10b981;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2310b981' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  background-size: 16px;
  padding-right: 40px;
  animation: successPop 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.form-group.is-valid input:focus,
.form-group.is-valid textarea:focus {
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.15);
}

@keyframes successPop {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.02);
  }
  100% {
    transform: scale(1);
  }
}

/* Error state */
.form-group.is-error input,
.form-group.is-error textarea {
  border-color: #ef4444;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23ef4444' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='12' cy='12' r='10'%3E%3C/circle%3E%3Cline x1='12' y1='8' x2='12' y2='12'%3E%3C/line%3E%3Cline x1='12' y1='16' x2='12.01' y2='16'%3E%3C/line%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  background-size: 16px;
  padding-right: 40px;
  animation: shakeError 0.5s cubic-bezier(0.36, 0.07, 0.19, 0.97);
}

.form-group.is-error input:focus,
.form-group.is-error textarea:focus {
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.15);
}

@keyframes shakeError {
  0%, 100% {
    transform: translateX(0);
  }
  10%, 30%, 50%, 70%, 90% {
    transform: translateX(-4px);
  }
  20%, 40%, 60%, 80% {
    transform: translateX(4px);
  }
}

/* Error message */
.form-error-message {
  font-size: 0.75rem;
  color: #ef4444;
  margin-top: 6px;
  display: flex;
  align-items: center;
  gap: 4px;
  animation: slideDown 0.3s ease;
}

.form-error-message::before {
  content: '⚠';
  font-size: 0.9rem;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Success message */
.form-success-message {
  font-size: 0.75rem;
  color: #10b981;
  margin-top: 6px;
  display: flex;
  align-items: center;
  gap: 4px;
  animation: slideDown 0.3s ease;
}

.form-success-message::before {
  content: '✓';
  font-size: 0.9rem;
  font-weight: bold;
}

/* ═══════════════════════════════════════════════════════════════
   CHARACTER COUNTER
   ═══════════════════════════════════════════════════════════════ */

.form-counter {
  font-size: 0.75rem;
  color: var(--muted);
  margin-top: 4px;
  text-align: right;
  transition: color 0.2s ease;
}

.form-counter.counter-warning {
  color: #f59e0b;
  font-weight: 600;
}

.form-counter.counter-danger {
  color: #ef4444;
  font-weight: 700;
  animation: counterPulse 1s ease-in-out infinite;
}

@keyframes counterPulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.6;
  }
}

/* ═══════════════════════════════════════════════════════════════
   SUBMIT BUTTON LOADING STATES
   ═══════════════════════════════════════════════════════════════ */

.btn.is-loading {
  position: relative;
  color: transparent;
  pointer-events: none;
  cursor: not-allowed;
}

.btn.is-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-top-color: white;
  border-radius: 50%;
  animation: buttonSpinner 0.6s linear infinite;
}

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

/* Success state for submit button */
.btn.is-success {
  background: linear-gradient(135deg, #10b981, #059669);
  animation: buttonSuccess 0.6s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.btn.is-success::before {
  content: '✓';
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  font-size: 1.2rem;
  font-weight: bold;
  animation: checkmarkPop 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55) 0.2s;
}

@keyframes buttonSuccess {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
  100% {
    transform: scale(1);
  }
}

@keyframes checkmarkPop {
  0% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0);
  }
  100% {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
  }
}

/* ═══════════════════════════════════════════════════════════════
   INPUT HOVER EFFECTS
   ═══════════════════════════════════════════════════════════════ */

.form-group input:hover:not(:focus),
.form-group textarea:hover:not(:focus) {
  border-color: rgba(139, 92, 246, 0.3);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

/* ═══════════════════════════════════════════════════════════════
   AUTOFILL STYLING
   ═══════════════════════════════════════════════════════════════ */

.form-group input:-webkit-autofill,
.form-group input:-webkit-autofill:hover,
.form-group input:-webkit-autofill:focus {
  -webkit-box-shadow: 0 0 0 1000px var(--surface) inset;
  -webkit-text-fill-color: var(--text);
  border-color: var(--accent);
  transition: background-color 5000s ease-in-out 0s;
}

/* ═══════════════════════════════════════════════════════════════
   SELECTION CARDS (Radio/Checkbox) ENHANCEMENTS
   ═══════════════════════════════════════════════════════════════ */

.selection-card {
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.selection-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--accent), var(--secondary));
  opacity: 0;
  transition: opacity 0.3s ease;
}

.selection-card:hover::before {
  opacity: 0.05;
}

.selection-card input:checked ~ .selection-content {
  animation: cardSelect 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

@keyframes cardSelect {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
  100% {
    transform: scale(1);
  }
}

/* Checkmark animation for selected cards */
.selection-card input:checked ~ .selection-content::after {
  content: '✓';
  position: absolute;
  top: 8px;
  right: 8px;
  width: 20px;
  height: 20px;
  background: linear-gradient(135deg, var(--accent), var(--secondary));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: bold;
  color: white;
  animation: checkmarkAppear 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

@keyframes checkmarkAppear {
  0% {
    opacity: 0;
    transform: scale(0) rotate(-180deg);
  }
  100% {
    opacity: 1;
    transform: scale(1) rotate(0deg);
  }
}

/* ═══════════════════════════════════════════════════════════════
   FOCUS VISIBLE (Keyboard Navigation)
   ═══════════════════════════════════════════════════════════════ */

.form-group input:focus-visible,
.form-group textarea:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.selection-card:focus-within {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: var(--radius);
}

/* ═══════════════════════════════════════════════════════════════
   DISABLED STATE
   ═══════════════════════════════════════════════════════════════ */

.form-group input:disabled,
.form-group textarea:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  background: rgba(170, 182, 211, 0.05);
}

/* ═══════════════════════════════════════════════════════════════
   REDUCED MOTION
   ═══════════════════════════════════════════════════════════════ */

@media (prefers-reduced-motion: reduce) {
  .form-group label,
  .form-group input,
  .form-group textarea,
  .selection-card,
  .btn {
    transition: none !important;
    animation: none !important;
  }
  
  .form-group::before {
    animation: none !important;
  }
}

/* ═══════════════════════════════════════════════════════════════
   MOBILE OPTIMIZATIONS
   ═══════════════════════════════════════════════════════════════ */

@media (max-width: 768px) {
  .form-group.floating-label label {
    font-size: 0.9rem;
  }
  
  .form-group.floating-label.is-focused label,
  .form-group.floating-label.is-filled label {
    font-size: 0.7rem;
  }
  
  /* Larger touch targets on mobile */
  .form-group input,
  .form-group textarea {
    padding: 16px;
    font-size: 16px; /* Prevents zoom on iOS */
  }
}