/* ============================================
   カメコツイートジェネレータ - Design System
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@300;400;500;600;700&family=Inter:wght@300;400;500;600;700&display=swap');

/* --- CSS Custom Properties --- */
:root {
  /* Colors */
  --bg-primary: #0a0a14;
  --bg-secondary: #12121f;
  --bg-card: rgba(22, 22, 40, 0.7);
  --bg-card-hover: rgba(30, 30, 55, 0.85);
  --bg-input: rgba(18, 18, 35, 0.9);
  --bg-input-focus: rgba(25, 25, 50, 0.95);

  --accent-primary: #6c5ce7;
  --accent-secondary: #a29bfe;
  --accent-glow: rgba(108, 92, 231, 0.3);
  --accent-gradient: linear-gradient(135deg, #6c5ce7, #a29bfe, #74b9ff);

  --text-primary: #e8e8f0;
  --text-secondary: #8888a8;
  --text-muted: #555570;
  --text-accent: #a29bfe;

  --border-default: rgba(108, 92, 231, 0.15);
  --border-focus: rgba(108, 92, 231, 0.5);
  --border-subtle: rgba(255, 255, 255, 0.06);

  --success: #00cec9;
  --success-glow: rgba(0, 206, 201, 0.3);

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;

  /* Shadows */
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.3), 0 0 0 1px var(--border-subtle);
  --shadow-input: 0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow-glow: 0 0 40px var(--accent-glow);

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- Reset & Base --- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'Noto Sans JP', 'Inter', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.7;
  overflow-x: hidden;
}

/* --- Animated Background --- */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background:
    radial-gradient(ellipse at 20% 20%, rgba(108, 92, 231, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 80%, rgba(116, 185, 255, 0.06) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 50%, rgba(162, 155, 254, 0.04) 0%, transparent 60%);
  pointer-events: none;
  z-index: 0;
  animation: bgPulse 12s ease-in-out infinite alternate;
}

@keyframes bgPulse {
  0% { opacity: 0.7; }
  100% { opacity: 1; }
}

/* --- Layout --- */
.app-container {
  position: relative;
  z-index: 1;
  max-width: 720px;
  margin: 0 auto;
  padding: var(--space-lg) var(--space-md) var(--space-2xl);
}

/* --- Header --- */
.app-header {
  text-align: center;
  margin-bottom: var(--space-2xl);
  animation: fadeInDown 0.6s var(--transition-normal);
}

.app-header__logo {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
}

.app-header__icon {
  font-size: 2rem;
  animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

.app-header__title {
  font-size: 1.75rem;
  font-weight: 700;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: 0.02em;
}

.app-header__subtitle {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 300;
  letter-spacing: 0.1em;
}

/* --- Card --- */
.card {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow-card);
  transition: var(--transition-normal);
  animation: fadeInUp 0.5s var(--transition-normal);
}

.card + .card {
  margin-top: var(--space-lg);
}

.card:hover {
  border-color: var(--border-focus);
  box-shadow: var(--shadow-card), var(--shadow-glow);
}

.card__title {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-accent);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: var(--space-lg);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.card__title::after {
  content: '';
  flex: 1;
  height: 1px;
  background: linear-gradient(to right, var(--border-focus), transparent);
}

/* --- Form Elements --- */
.form-group {
  margin-bottom: var(--space-lg);
}

.form-group:last-child {
  margin-bottom: 0;
}

.form-label {
  display: block;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
  transition: color var(--transition-fast);
}

.form-label__optional {
  font-size: 0.7rem;
  color: var(--text-muted);
  font-weight: 300;
  margin-left: var(--space-xs);
}

.form-input,
.form-textarea {
  width: 100%;
  padding: var(--space-md);
  background: var(--bg-input);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.95rem;
  outline: none;
  transition: var(--transition-normal);
  box-shadow: var(--shadow-input);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--text-muted);
}

.form-input:focus,
.form-textarea:focus {
  background: var(--bg-input-focus);
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-input), 0 0 0 3px var(--accent-glow);
}

.form-textarea {
  min-height: 100px;
  resize: vertical;
  line-height: 1.8;
}

/* Date Input custom styling */
input[type="date"] {
  cursor: pointer;
}

input[type="date"]::-webkit-calendar-picker-indicator {
  filter: invert(0.7) sepia(0.5) hue-rotate(200deg);
  cursor: pointer;
  transition: var(--transition-fast);
}

input[type="date"]::-webkit-calendar-picker-indicator:hover {
  filter: invert(0.9) sepia(0.5) hue-rotate(200deg);
}

/* --- Live Sub-options & Chips --- */
.live-options {
  margin-top: var(--space-sm);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  background: rgba(0, 0, 0, 0.25);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
}

.live-option-row {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.live-option-label {
  font-size: 0.78rem;
  color: var(--text-secondary);
  font-weight: 600;
  min-width: 36px;
}

.chip-group {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.chip {
  background: var(--bg-input);
  border: 1px solid var(--border-default);
  color: var(--text-secondary);
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition-fast);
}

.chip:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
  border-color: var(--border-focus);
}

.chip.active {
  background: var(--accent-primary);
  color: #fff;
  border-color: var(--accent-primary);
  box-shadow: 0 2px 8px var(--accent-glow);
}

.form-input--sm {
  padding: 4px 10px;
  font-size: 0.78rem;
  max-width: 120px;
  height: 30px;
}

/* --- Reference Links --- */
.reference-links {
  font-size: 0.8rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.reference-links a {
  color: var(--text-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
  font-weight: 500;
}

.reference-links a:hover {
  color: var(--accent-secondary);
  text-decoration: underline;
}

.reference-links__sep {
  color: var(--text-muted);
  font-size: 0.75rem;
}

/* --- Checkbox Group --- */
.checkbox-group {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: var(--space-sm);
}

.checkbox-item {
  position: relative;
}

.checkbox-item input[type="checkbox"] {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.checkbox-item label {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-input);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.88rem;
  color: var(--text-secondary);
  transition: var(--transition-normal);
  user-select: none;
}

.checkbox-item label::before {
  content: '';
  display: inline-block;
  width: 18px;
  height: 18px;
  min-width: 18px;
  border: 2px solid var(--text-muted);
  border-radius: 4px;
  transition: var(--transition-normal);
  background: transparent;
}

.checkbox-item label:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-focus);
  color: var(--text-primary);
}

.checkbox-item input[type="checkbox"]:checked + label {
  background: rgba(108, 92, 231, 0.12);
  border-color: var(--accent-primary);
  color: var(--text-primary);
}

.checkbox-item input[type="checkbox"]:checked + label::before {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='white' width='14' height='14'%3E%3Cpath d='M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
  background-size: 14px;
}

/* --- Member Group Heading --- */
.member-group-heading {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-accent);
  letter-spacing: 0.1em;
  margin-top: var(--space-lg);
  margin-bottom: var(--space-sm);
  padding: var(--space-xs) var(--space-md);
  background: rgba(108, 92, 231, 0.08);
  border-left: 3px solid var(--accent-primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.member-group-heading:first-child {
  margin-top: 0;
}

/* --- Output Section --- */
.output-section {
  position: relative;
}

.output-preview {
  width: 100%;
  min-height: 180px;
  padding: var(--space-lg);
  background: var(--bg-primary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: 'Noto Sans JP', sans-serif;
  font-size: 0.95rem;
  line-height: 1.9;
  white-space: pre-wrap;
  word-break: break-word;
  transition: var(--transition-normal);
}

.output-preview:empty::before {
  content: 'ここにプレビューが表示されます...';
  color: var(--text-muted);
  font-style: italic;
}

/* --- Buttons --- */
.btn-group {
  display: flex;
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.btn {
  flex: 1;
  padding: var(--space-md) var(--space-lg);
  border: none;
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-normal);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  letter-spacing: 0.02em;
}

.btn--primary {
  background: var(--accent-gradient);
  color: #fff;
  box-shadow: 0 4px 16px var(--accent-glow);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(108, 92, 231, 0.4);
}

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

.btn--secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-secondary);
  border: 1px solid var(--border-default);
}

.btn--secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
  border-color: var(--border-focus);
}

/* --- Copy Feedback Toast --- */
.toast {
  position: fixed;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--success);
  color: #0a0a14;
  padding: var(--space-md) var(--space-xl);
  border-radius: var(--radius-xl);
  font-size: 0.88rem;
  font-weight: 600;
  box-shadow: 0 8px 32px var(--success-glow);
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* --- Animations --- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Stagger animation */
.card:nth-child(2) { animation-delay: 0.1s; }
.card:nth-child(3) { animation-delay: 0.2s; }

/* --- Responsive --- */
@media (max-width: 600px) {
  .app-container {
    padding: var(--space-md) var(--space-sm) var(--space-2xl);
  }

  .app-header__title {
    font-size: 1.4rem;
  }

  .card {
    padding: var(--space-md);
    border-radius: var(--radius-md);
  }

  .checkbox-group {
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  }

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

/* --- Scrollbar --- */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--border-focus);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent-primary);
}

/* --- Character Count --- */
.char-count {
  text-align: right;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: var(--space-xs);
  transition: color var(--transition-fast);
}

.char-count.warning {
  color: #fdcb6e;
}

.char-count.danger {
  color: #e17055;
}