/* Header Dynamic UI Animations */

/* ========================================
   Phase 1: Authentication State Transitions
   ======================================== */

/* Fade in animation for login form */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Slide in from right for user info */
@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* Fade out animation */
@keyframes fadeOut {
  from {
    opacity: 1;
    transform: translateY(0);
  }
  to {
    opacity: 0;
    transform: translateY(-10px);
  }
}

/* Apply animations to login form */
.user-sign {
  animation: fadeIn 0.4s ease-in-out;
}

/* Apply animations to user info */
.user-info {
  animation: slideInRight 0.5s ease-out;
}

/* ========================================
   Phase 1.2: Input Field Interactions
   ======================================== */

/* Input focus animations */
.user-name input,
.user-password input {
  transition: all 0.3s ease;
  border: 2px solid transparent;
  background-color: rgba(255, 255, 255, 0.1);
  color: white;
}

.user-name input:focus,
.user-password input:focus {
  transform: scale(1.02);
  box-shadow: 0 0 15px rgba(0, 178, 255, 0.4);
  border-color: #00b2ff;
  background-color: rgba(255, 255, 255, 0.15);
  outline: none;
}

.user-name input:hover,
.user-password input:hover {
  background-color: rgba(255, 255, 255, 0.12);
  border-color: rgba(0, 178, 255, 0.3);
}

/* Error state for inputs */
.user-name input.error,
.user-password input.error {
  animation: shake 0.5s ease-in-out;
  border-color: #ff4444;
  box-shadow: 0 0 10px rgba(255, 68, 68, 0.3);
}

/* Shake animation for errors */
@keyframes shake {
  0%, 100% {
    transform: translateX(0);
  }
  10%, 30%, 50%, 70%, 90% {
    transform: translateX(-8px);
  }
  20%, 40%, 60%, 80% {
    transform: translateX(8px);
  }
}

/* Valid input state */
.user-name input.valid,
.user-password input.valid {
  border-color: #4caf50;
  box-shadow: 0 0 8px rgba(76, 175, 80, 0.3);
}

/* Input placeholder styling */
.user-name input::placeholder,
.user-password input::placeholder {
  color: rgba(255, 255, 255, 0.5);
  transition: opacity 0.3s ease;
}

.user-name input:focus::placeholder,
.user-password input:focus::placeholder {
  opacity: 0.7;
}

/* ========================================
   Phase 1.3: Button Interactions - Enhanced
   ======================================== */

/* Button hover animations - smooth gradient transition */
.btn_login {
  transition: background 0.4s cubic-bezier(0.4, 0, 0.2, 1), transform 0.3s ease, box-shadow 0.3s ease;
  position: relative;
  overflow: visible;
  will-change: background, transform;
  min-height: 40px;
  box-sizing: border-box;
}

/* Ensure text stays visible during all states */
.btn_login span {
  position: relative;
  z-index: 1;
  transition: background 0.3s ease, color 0.3s ease, -webkit-text-fill-color 0.3s ease;
  pointer-events: none;
  /* Ensure initial visibility - use white for guaranteed visibility */
  color: #FFFFFF !important;
  -webkit-text-fill-color: #FFFFFF !important;
  background: none !important;
  -webkit-background-clip: unset !important;
  background-clip: unset !important;
  opacity: 1 !important;
  visibility: visible !important;
}

/* Smooth gradient transition on hover - no size change */
.btn_login:hover:not(:disabled):not(.loading) {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 122, 255, 0.5);
}

/* Active state - slight press down, no size increase */
.btn_login:active:not(:disabled):not(.loading) {
  transform: translateY(0);
  transition: transform 0.1s ease, box-shadow 0.1s ease;
}

.btn_login:active:not(:disabled):not(.loading)::before {
  box-shadow: 0 2px 10px rgba(0, 122, 255, 0.4);
}

/* Button ripple effect - subtle */
.btn_login::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  transform: translate(-50%, -50%);
  transition: width 0.5s ease, height 0.5s ease, opacity 0.5s ease;
  opacity: 0;
  z-index: 0;
  pointer-events: none;
}

.btn_login:active:not(:disabled):not(.loading)::after {
  width: 200px;
  height: 200px;
  opacity: 1;
  transition: width 0.3s ease, height 0.3s ease, opacity 0.3s ease;
}

/* Loading button state - preserve text visibility */
.btn_login.loading {
  cursor: not-allowed;
  opacity: 0.85;
  pointer-events: none;
  transform: none !important;
}

.btn_login.loading span {
  opacity: 1;
  color: white;
}

.btn_login.loading::before {
  background: linear-gradient(93.67deg, #007AFF 2.87%, #00F0FF 100%);
}

/* Disabled button state */
.btn_login:disabled {
  cursor: not-allowed;
  opacity: 0.5;
  pointer-events: none;
  transform: none !important;
}

/* Focus state for accessibility */
.btn_login:focus {
  outline: 2px solid #00F0FF;
  outline-offset: 3px;
}

.btn_login:focus:not(:focus-visible) {
  outline: none;
}

/* ========================================
   Phase 2.3: Error Handling & Notifications
   ======================================== */

/* Error message slide down animation */
@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
    max-height: 0;
  }
  to {
    opacity: 1;
    transform: translateY(0);
    max-height: 100px;
  }
}

/* Error message slide up (dismiss) */
@keyframes slideUp {
  from {
    opacity: 1;
    transform: translateY(0);
    max-height: 100px;
  }
  to {
    opacity: 0;
    transform: translateY(-20px);
    max-height: 0;
  }
}

.header-login-error {
  animation: slideDown 0.3s ease-out;
  color: #ff4444;
  font-size: 12px;
  margin-top: 8px;
  padding: 8px 12px;
  background-color: rgba(255, 68, 68, 0.1);
  border-left: 3px solid #ff4444;
  border-radius: 4px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.header-login-error::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
  animation: shimmer 2s infinite;
}

@keyframes shimmer {
  0% {
    left: -100%;
  }
  100% {
    left: 100%;
  }
}

/* Error icon pulse */
.header-login-error.dismissing {
  animation: slideUp 0.3s ease-out forwards;
}

/* ========================================
   Phase 2.1: Live Balance Updates
   ======================================== */

/* Balance increase animation (green flash) */
@keyframes balanceIncrease {
  0% {
    color: white;
    transform: scale(1);
  }
  50% {
    color: #4caf50;
    transform: scale(1.15);
  }
  100% {
    color: white;
    transform: scale(1);
  }
}

/* Balance decrease animation (red flash) */
@keyframes balanceDecrease {
  0% {
    color: white;
    transform: scale(1);
  }
  50% {
    color: #ff4444;
    transform: scale(1.15);
  }
  100% {
    color: white;
    transform: scale(1);
  }
}

/* Pulse animation for balance changes */
@keyframes pulse {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
}

.user-info-value.balance-updated {
  animation: pulse 0.6s ease-in-out;
}

.user-info-value.balance-increase {
  animation: balanceIncrease 0.8s ease-in-out;
}

.user-info-value.balance-decrease {
  animation: balanceDecrease 0.8s ease-in-out;
}

/* ========================================
   Phase 3.2: Navigation Highlights
   ======================================== */

/* Active nav item underline animation */
.nav-item.active::after {
  animation: slideInUnderline 0.3s ease-out;
}

@keyframes slideInUnderline {
  from {
    transform: scaleX(0);
  }
  to {
    transform: scaleX(1);
  }
}

/* Nav item hover effect */
.nav-item {
  transition: all 0.3s ease;
  position: relative;
}

.nav-item:hover:not(.active) {
  background-color: rgba(0, 122, 255, 0.2);
  transform: translateY(-2px);
}

.nav-item:active {
  transform: translateY(0);
}

/* ========================================
   Phase 3.3: Logo Interactions
   ======================================== */

.header-logo img {
  transition: all 0.3s ease;
  cursor: pointer;
}

.header-logo img:hover {
  transform: scale(1.05);
  filter: brightness(1.1);
}

.header-logo img:active {
  transform: scale(0.98);
  transition: transform 0.1s ease;
}

/* ========================================
   Loading Spinner Animation
   ======================================== */

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

.loading-spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

/* ========================================
   Accessibility: Reduced Motion
   ======================================== */

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

/* ========================================
   Responsive Animations
   ======================================== */

@media only screen and (max-width: 1023px) {
  .user-sign {
    animation-duration: 0.3s;
  }
  
  .user-info {
    animation-duration: 0.4s;
  }
}