/**
 * UI/UX Enhancements CSS
 * 包括的なUI/UX改善のためのスタイルシート
 */

/* =============================================
   1. Progressive Image Loading
   ============================================= */

.progressive-image {
  position: relative;
  overflow: hidden;
  background: var(--color-gray-100);
}

.progressive-image::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent 0%, rgba(255, 255, 255, 0.3) 50%, transparent 100%);
  animation: shimmer 2s infinite;
  transform: translateX(-100%);
}

@keyframes shimmer {
  to {
    transform: translateX(100%);
  }
}

.progressive-image.image-loaded::before {
  display: none;
}

/* =============================================
   2. Micro Interactions
   ============================================= */

/* Ripple Effect */
[data-ripple] {
  position: relative;
  overflow: hidden;
}

[data-ripple] span.ripple {
  position: absolute;
  border-radius: 50%;
  background: currentColor;
  opacity: 0.3;
  transform: scale(0);
  animation: ripple-animation 0.6s ease-out;
  pointer-events: none;
}

@keyframes ripple-animation {
  to {
    transform: scale(4);
    opacity: 0;
  }
}

/* Magnetic Effect */
[data-magnetic] {
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  will-change: transform;
}

/* 3D Card Effect */
[data-3d-card] {
  transform-style: preserve-3d;
  transition: transform 0.3s ease-out;
  will-change: transform;
}

[data-3d-card]:hover {
  transform: perspective(1000px) rotateX(var(--rotate-x, 0deg)) rotateY(var(--rotate-y, 0deg)) scale3d(1.05, 1.05, 1.05);
}

.card-gloss {
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(45deg, transparent 30%, rgba(255, 255, 255, 0.1) 50%, transparent 70%);
  transform: rotate(45deg);
  opacity: 0;
  transition:
    opacity 0.3s ease,
    transform 0.3s ease;
  pointer-events: none;
  z-index: 1;
}

[data-3d-card]:hover .card-gloss {
  opacity: 0.4;
}

/* Typewriter Effect */
[data-typewriter] {
  border-right: 2px solid currentColor;
  white-space: nowrap;
  overflow: hidden;
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  0%,
  50% {
    border-color: currentColor;
  }
  51%,
  100% {
    border-color: transparent;
  }
}

/* Particle Effect */
.particle {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
  opacity: 0.6;
  animation: float 20s linear infinite;
}

@keyframes float {
  0% {
    transform: translate(0, 0) rotate(0deg);
  }
  33% {
    transform: translate(30px, -30px) rotate(120deg);
  }
  66% {
    transform: translate(-20px, 20px) rotate(240deg);
  }
  100% {
    transform: translate(0, 0) rotate(360deg);
  }
}

/* Success/Error Animations */
.success-animation {
  animation: success-pulse 0.5s ease-out;
}

@keyframes success-pulse {
  0% {
    transform: scale(1);
    box-shadow: 0 0 0 0 rgba(40, 167, 69, 0.4);
  }
  50% {
    transform: scale(1.05);
    box-shadow: 0 0 0 10px rgba(40, 167, 69, 0);
  }
  100% {
    transform: scale(1);
    box-shadow: 0 0 0 0 rgba(40, 167, 69, 0);
  }
}

.error-shake {
  animation: error-shake 0.5s ease-out;
}

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

/* =============================================
   3. Enhanced Forms
   ============================================= */

/* Form Field States */
.form-field {
  position: relative;
  margin-bottom: 1.5rem;
}

.form-field input,
.form-field textarea,
.form-field select {
  width: 100%;
  padding: 0.75rem 1rem;
  padding-right: 2.5rem;
  font-size: 1rem;
  line-height: 1.5;
  color: var(--color-text);
  background: var(--color-surface);
  border: 2px solid var(--color-gray-300);
  border-radius: var(--border-radius-md);
  transition: all 0.2s ease;
}

.form-field input:focus,
.form-field textarea:focus,
.form-field select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-alpha-20);
}

/* Validation States */
.form-field input.is-valid,
.form-field textarea.is-valid,
.form-field select.is-valid {
  border-color: var(--color-success, #28a745);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20' fill='%2328a745'%3E%3Cpath fill-rule='evenodd' d='M16.707 5.293a1 1 0 010 1.414l-8 8a1 1 0 01-1.414 0l-4-4a1 1 0 011.414-1.414L8 12.586l7.293-7.293a1 1 0 011.414 0z' clip-rule='evenodd'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  background-size: 1.25rem;
}

.form-field input.is-invalid,
.form-field textarea.is-invalid,
.form-field select.is-invalid {
  border-color: var(--color-error, #dc3545);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20' fill='%23dc3545'%3E%3Cpath fill-rule='evenodd' d='M18 10a8 8 0 11-16 0 8 8 0 0116 0zm-7 4a1 1 0 11-2 0 1 1 0 012 0zm-1-9a1 1 0 00-1 1v4a1 1 0 102 0V6a1 1 0 00-1-1z' clip-rule='evenodd'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  background-size: 1.25rem;
}

/* Validation Icon */
.validation-icon {
  position: absolute;
  right: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  width: 1.25rem;
  height: 1.25rem;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s ease;
}

input.is-valid ~ .validation-icon,
input.is-invalid ~ .validation-icon {
  opacity: 1;
}

.validation-icon.success {
  color: var(--color-success, #28a745);
}

.validation-icon.error {
  color: var(--color-error, #dc3545);
}

/* Error Messages */
.field-error {
  margin-top: 0.25rem;
  font-size: 0.875rem;
  color: var(--color-error, #dc3545);
  opacity: 0;
  transform: translateY(-0.5rem);
  transition: all 0.2s ease;
}

.field-error:not(:empty) {
  opacity: 1;
  transform: translateY(0);
}

.error-message {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  margin-top: 0.125rem;
}

.error-message::before {
  content: "•";
  font-weight: bold;
}

/* Character Counter */
.character-counter {
  position: absolute;
  right: 0;
  bottom: -1.25rem;
  font-size: 0.75rem;
  color: var(--color-text-muted);
  transition: color 0.2s ease;
}

.character-counter.warning {
  color: var(--color-warning, #ffc107);
}

.character-counter.danger {
  color: var(--color-error, #dc3545);
}

/* Progress Bar */
.form-progress {
  margin-bottom: 2rem;
}

.progress-bar {
  height: 0.5rem;
  background: var(--color-gray-200);
  border-radius: 0.25rem;
  overflow: hidden;
  margin-bottom: 0.5rem;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  width: 0;
  transition: width 0.3s ease;
  border-radius: inherit;
}

.progress-text {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  text-align: right;
}

/* Password Strength Meter */
.password-strength-meter {
  margin-top: 0.5rem;
}

.strength-bar {
  height: 0.25rem;
  background: var(--color-gray-200);
  border-radius: 0.125rem;
  overflow: hidden;
  margin-bottom: 0.25rem;
}

.strength-fill {
  height: 100%;
  width: 0;
  transition: all 0.3s ease;
  border-radius: inherit;
}

.strength-text {
  font-size: 0.75rem;
  text-align: right;
  font-weight: 500;
}

/* Auto-save Indicator */
.autosave-indicator {
  position: fixed;
  top: 1rem;
  right: 1rem;
  background: var(--color-success, #28a745);
  color: white;
  padding: 0.5rem 1rem;
  border-radius: var(--border-radius-full);
  font-size: 0.875rem;
  font-weight: 500;
  opacity: 0;
  transform: translateY(-1rem);
  transition: all 0.3s ease;
  z-index: 1000;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.autosave-indicator::before {
  content: "✓";
  font-size: 1rem;
}

.autosave-indicator.visible {
  opacity: 1;
  transform: translateY(0);
}

.autosave-indicator.saving {
  background: var(--color-warning, #ffc107);
}

.autosave-indicator.saving::before {
  content: "⟳";
  animation: spin 1s linear infinite;
}

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

/* Auto-save Prompt */
.autosave-prompt {
  background: var(--color-info-bg, #d1ecf1);
  border: 1px solid var(--color-info-border, #bee5eb);
  border-radius: var(--border-radius-md);
  padding: 1rem;
  margin-bottom: 1rem;
  animation: slideDown 0.3s ease-out;
}

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

.prompt-content p {
  margin: 0 0 0.75rem;
  color: var(--color-info-text, #0c5460);
}

.prompt-actions {
  display: flex;
  gap: 0.5rem;
}

.prompt-actions button {
  padding: 0.375rem 0.75rem;
  font-size: 0.875rem;
  border: none;
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-restore {
  background: var(--color-primary);
  color: white;
}

.btn-restore:hover {
  background: var(--color-primary-dark);
}

.btn-discard {
  background: var(--color-gray-200);
  color: var(--color-text);
}

.btn-discard:hover {
  background: var(--color-gray-300);
}

/* Required Field Mark */
.required-mark {
  color: var(--color-error, #dc3545);
  margin-left: 0.25rem;
  font-weight: normal;
}

/* Error Summary */
.error-summary {
  background: var(--color-error-bg, #f8d7da);
  border: 1px solid var(--color-error-border, #f5c6cb);
  border-radius: var(--border-radius-md);
  color: var(--color-error-text, #721c24);
  padding: 1rem;
  margin-bottom: 1rem;
  animation: slideDown 0.3s ease-out;
}

.error-summary h3 {
  margin: 0 0 0.5rem;
  font-size: 1rem;
  font-weight: 600;
}

.error-summary ul {
  margin: 0;
  padding-left: 1.5rem;
  list-style: none;
}

.error-summary li {
  position: relative;
  padding-left: 1rem;
  margin-bottom: 0.25rem;
}

.error-summary li::before {
  content: "⚠";
  position: absolute;
  left: 0;
}

.error-summary a {
  color: inherit;
  text-decoration: underline;
  font-weight: 500;
}

.error-summary a:hover {
  text-decoration: none;
}

/* Success Message */
.form-success-message {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.9);
  background: white;
  border-radius: var(--border-radius-lg);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
  padding: 2rem;
  text-align: center;
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 1001;
  min-width: 300px;
}

.form-success-message.visible {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}

.success-icon {
  width: 4rem;
  height: 4rem;
  margin: 0 auto 1rem;
  color: var(--color-success, #28a745);
  animation: success-bounce 0.5s ease-out;
}

@keyframes success-bounce {
  0% {
    transform: scale(0);
  }
  50% {
    transform: scale(1.2);
  }
  100% {
    transform: scale(1);
  }
}

.form-success-message p {
  margin: 0;
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--color-text);
}

/* =============================================
   4. Dark Mode Enhancements
   ============================================= */

.dark-mode-toggle {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 3rem;
  height: 3rem;
  border: none;
  background: var(--color-surface);
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  transition: all 0.3s ease;
  z-index: 100;
}

.dark-mode-toggle:hover {
  transform: scale(1.1);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
}

.dark-mode-toggle:active {
  transform: scale(0.95);
}

.dark-mode-toggle svg {
  width: 1.5rem;
  height: 1.5rem;
  transition: all 0.3s ease;
}

.dark-mode-toggle .icon-light {
  display: block;
  color: var(--color-primary);
}

.dark-mode-toggle .icon-dark {
  display: none;
  color: var(--color-secondary);
}

[data-theme="dark"] .dark-mode-toggle .icon-light {
  display: none;
}

[data-theme="dark"] .dark-mode-toggle .icon-dark {
  display: block;
}

/* Theme Transition */
.theme-transition,
.theme-transition *,
.theme-transition *::before,
.theme-transition *::after {
  transition:
    background-color 0.3s ease,
    color 0.3s ease,
    border-color 0.3s ease,
    box-shadow 0.3s ease !important;
}

/* =============================================
   5. Enhanced Navigation
   ============================================= */

.nav-link {
  position: relative;
  color: var(--color-text);
  text-decoration: none;
  padding: 0.5rem 1rem;
  transition: color 0.2s ease;
  font-weight: 500;
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transform: translateX(-50%);
  transition: width 0.3s ease;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-primary);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 80%;
}

/* =============================================
   6. Skeleton Screens
   ============================================= */

.skeleton {
  position: relative;
  overflow: hidden;
  background: var(--color-gray-200);
  border-radius: var(--border-radius-sm);
}

.skeleton::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent 0%, rgba(255, 255, 255, 0.4) 50%, transparent 100%);
  animation: skeleton-wave 1.5s infinite;
  transform: translateX(-100%);
}

@keyframes skeleton-wave {
  to {
    transform: translateX(100%);
  }
}

.skeleton-text {
  height: 1rem;
  margin-bottom: 0.5rem;
  border-radius: var(--border-radius-sm);
}

.skeleton-title {
  height: 1.5rem;
  width: 60%;
  margin-bottom: 1rem;
}

.skeleton-image {
  aspect-ratio: 16/9;
  border-radius: var(--border-radius-md);
}

.skeleton-button {
  height: 2.5rem;
  width: 120px;
  border-radius: var(--border-radius-full);
}

/* =============================================
   7. Enhanced Cards
   ============================================= */

.event-card,
.participation-card {
  position: relative;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  transform-style: preserve-3d;
  will-change: transform;
}

.event-card:hover,
.participation-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.15);
}

/* Sibling dimming effect */
.event-cards-grid:hover .event-card:not(:hover),
.participation-grid:hover .participation-card:not(:hover) {
  opacity: 0.7;
  transform: scale(0.98);
}

/* =============================================
   8. Mobile Optimizations
   ============================================= */

@media (max-width: 768px) {
  /* Touch-friendly tap targets */
  button,
  a,
  input,
  textarea,
  select {
    min-height: 44px;
    min-width: 44px;
  }

  /* Improved mobile navigation */
  .nav-links {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: 80%;
    max-width: 300px;
    background: var(--color-surface);
    transform: translateX(100%);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1000;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }

  .nav-links--open {
    transform: translateX(0);
    box-shadow: -4px 0 12px rgba(0, 0, 0, 0.15);
  }

  /* Mobile form improvements */
  .form-field input,
  .form-field textarea,
  .form-field select {
    font-size: 16px; /* Prevents zoom on iOS */
  }

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

/* =============================================
   9. Print Styles
   ============================================= */

@media print {
  .dark-mode-toggle,
  .autosave-indicator,
  .chat-widget,
  .mobile-menu-toggle {
    display: none !important;
  }

  .progressive-image {
    filter: none !important;
  }

  * {
    animation: none !important;
    transition: none !important;
  }
}