/* ========================================
   UI Improvements - Battle Mode, Model Selector, Empty States
   Matching reference designs for clean, modern look
   ======================================== */

/* Battle Mode Empty State - Centered Card */
.chat-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 60px 40px;
  max-width: 700px;
  margin: 80px auto;
  background: var(--card-bg, rgba(18, 19, 26, 0.95));
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--card-border, rgba(255, 255, 255, 0.08));
  border-radius: var(--radius-xl, 24px);
  box-shadow: var(--shadow-card, 0 8px 32px rgba(0, 0, 0, 0.3));
  animation: fadeInScale 0.4s ease-out forwards;
  transition: border-color var(--transition-normal, 0.2s), box-shadow var(--transition-normal, 0.2s);
}

.chat-empty:hover {
  border-color: var(--card-border-hover, rgba(255, 255, 255, 0.12));
  box-shadow: var(--shadow-card-hover, 0 12px 40px rgba(0, 0, 0, 0.4));
}

.chat-empty-icon {
  margin-bottom: 24px;
  opacity: 0.8;
}

.chat-empty-title {
  font-size: 32px;
  font-weight: 700;
  margin: 0 0 12px;
  color: rgba(255, 255, 255, 0.95);
}

.chat-empty-subtitle {
  font-size: 16px;
  color: rgba(255, 255, 255, 0.6);
  margin: 0 0 32px;
  line-height: 1.5;
}

/* Random Battle Card */
.random-battle-card {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  margin: 32px 0;
  padding: 24px;
  background: var(--bg-3, rgba(26, 27, 36, 0.8));
  border: 1px solid var(--line, rgba(255, 255, 255, 0.08));
  border-radius: var(--radius-lg, 16px);
  width: 100%;
  max-width: 500px;
  animation: fadeInUp 0.5s ease-out forwards;
  animation-delay: 0.2s;
  opacity: 0;
  transition: transform var(--transition-normal, 0.2s), box-shadow var(--transition-normal, 0.2s);
}

.random-battle-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.random-model {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  flex: 1;
  transition: transform var(--transition-fast, 0.15s);
}

.random-model:hover {
  transform: scale(1.05);
}

.random-icon {
  font-size: 32px;
  opacity: 0.8;
  transition: opacity var(--transition-fast, 0.15s), transform var(--transition-fast, 0.15s);
}

.random-model:hover .random-icon {
  opacity: 1;
  transform: scale(1.1);
}

.random-label {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary, rgba(255, 255, 255, 0.9));
}

.vs-badge {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-terra, #CB9275);
  padding: 8px 16px;
  background: var(--prefer-btn-bg, rgba(203, 146, 117, 0.1));
  border: 1px solid var(--prefer-btn-border, rgba(203, 146, 117, 0.3));
  border-radius: var(--radius-md, 12px);
  animation: pulse 2s ease-in-out infinite;
}

.model-selector-hint {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.5);
  margin: 24px 0 0;
}

/* Arena/Side-by-Side Model Selector - Horizontal Layout */
.model-selector-grid {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 20px;
  align-items: start;
  width: 100%;
  max-width: 800px;
  margin: 32px 0;
  padding: 24px;
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 16px;
}

.model-selector-column {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.model-label {
  font-size: 13px;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.7);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 4px;
}

.model-select {
  width: 100%;
  padding: 12px 16px;
  background: rgba(0, 0, 0, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 12px;
  color: rgba(255, 255, 255, 0.95);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1L6 6L11 1' stroke='rgba(255,255,255,0.6)' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
}

.model-select:hover {
  border-color: rgba(74, 171, 194, 0.4);
  background-color: rgba(0, 0, 0, 0.6);
}

.model-select:focus {
  outline: none;
  border-color: rgba(74, 171, 194, 0.6);
  box-shadow: 0 0 0 3px rgba(74, 171, 194, 0.1);
}

.model-select option {
  background: #1a1b2e;
  color: rgba(255, 255, 255, 0.95);
  padding: 10px;
}

.model-selector-actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: center;
  justify-content: center;
  padding-top: 24px;
}

.icon-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 12px;
  color: rgba(255, 255, 255, 0.9);
  font-size: 20px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.icon-btn:hover {
  background: rgba(74, 171, 194, 0.2);
  border-color: rgba(74, 171, 194, 0.4);
  transform: scale(1.05);
}

.icon-btn:active {
  transform: scale(0.95);
}

.secondary-btn {
  padding: 10px 16px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 12px;
  color: rgba(255, 255, 255, 0.85);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.secondary-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-1px);
}

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

/* Responsive Adjustments */
@media (max-width: 768px) {
  .chat-empty {
    padding: 40px 24px;
    margin: 40px 20px;
  }

  .chat-empty-title {
    font-size: 26px;
  }

  .random-battle-card {
    flex-direction: column;
    gap: 16px;
    padding: 20px;
  }

  .vs-badge {
    transform: rotate(90deg);
  }

  .model-selector-grid {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto auto;
    gap: 16px;
    padding: 20px;
  }

  .model-selector-actions {
    flex-direction: row;
    padding-top: 0;
  }

  .model-select {
    font-size: 16px;
    padding: 14px 16px;
    padding-right: 40px;
  }
}

/* Direct Chat Model Selector */
.direct-model-selector {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: 32px 0;
  max-width: 400px;
}

.direct-model-selector .model-label {
  text-align: left;
}

.direct-model-selector .model-select {
  width: 100%;
}

/* Thread List Improvements */
.chat-item-wrapper {
  position: relative;
  margin-bottom: 4px;
}

.chat-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  padding-right: 80px;
  border-radius: 10px;
  border: 1px solid transparent;
  transition: all 0.2s ease;
  text-decoration: none;
  color: inherit;
  position: relative;
}

.chat-item:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.08);
}

.chat-item.active {
  background: rgba(74, 171, 194, 0.1);
  border-color: rgba(74, 171, 194, 0.3);
}

.chat-actions {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  gap: 4px;
  opacity: 0;
  transition: opacity 0.2s ease;
}

.chat-item-wrapper:hover .chat-actions {
  opacity: 1;
}

.chat-action-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: rgba(0, 0, 0, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
  font-size: 14px;
}

.chat-action-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.25);
  transform: scale(1.05);
}

.chat-action-btn[data-action="delete"]:hover {
  background: rgba(239, 68, 68, 0.2);
  border-color: rgba(239, 68, 68, 0.4);
}

/* Inline Thread Editing */
.chat-item.editing {
  background: rgba(74, 171, 194, 0.1);
  border-color: rgba(74, 171, 194, 0.3);
}

.chat-item.editing .chat-title {
  display: none;
}

.chat-title-input {
  flex: 1;
  background: rgba(0, 0, 0, 0.5);
  border: 1px solid rgba(74, 171, 194, 0.4);
  border-radius: 6px;
  padding: 6px 10px;
  color: rgba(255, 255, 255, 0.95);
  font-size: 14px;
  outline: none;
}

.chat-title-input:focus {
  border-color: rgba(74, 171, 194, 0.6);
  box-shadow: 0 0 0 2px rgba(74, 171, 194, 0.1);
}

/* Improved Response Cards */
.response-card {
  background: rgba(20, 22, 35, 0.6);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 16px;
  padding: 20px;
  transition: all 0.3s ease;
}

.response-card:hover {
  border-color: rgba(255, 255, 255, 0.12);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

.response-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.model-badge {
  font-size: 13px;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.9);
  padding: 6px 12px;
  background: rgba(74, 171, 194, 0.15);
  border: 1px solid rgba(74, 171, 194, 0.3);
  border-radius: 8px;
}

.response-actions {
  display: flex;
  gap: 6px;
}

.response-action-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
  opacity: 0.7;
}

.response-action-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
  opacity: 1;
  transform: scale(1.05);
}

/* Loading States */
.response-loading {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 20px;
  color: rgba(255, 255, 255, 0.6);
  font-size: 14px;
}

.response-loading .loader-spinner {
  width: 20px;
  height: 20px;
  border: 2px solid rgba(255, 255, 255, 0.2);
  border-top-color: #4AABC2;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* Error States */
.response-error {
  padding: 16px;
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-radius: 12px;
  color: rgba(255, 255, 255, 0.9);
  font-size: 14px;
}

/* User Message Bubble */
.user-bubble {
  background: rgba(74, 171, 194, 0.15);
  border: 1px solid rgba(74, 171, 194, 0.3);
  border-radius: 16px;
  padding: 16px 20px;
  max-width: 800px;
  margin: 0 auto 32px;
}

.user-text {
  color: rgba(255, 255, 255, 0.95);
  font-size: 15px;
  line-height: 1.6;
  word-wrap: break-word;
}

/* Voting UI Improvements */
.floating-voting-container {
  background: rgba(15, 17, 25, 0.95);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 20px;
  padding: 16px 24px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

.vote-buttons {
  display: flex;
  gap: 12px;
  align-items: center;
  justify-content: center;
}

.vote-btn-light {
  padding: 12px 24px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 12px;
  color: rgba(255, 255, 255, 0.9);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.vote-btn-light:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.25);
  transform: translateY(-2px);
}

.vote-btn-light.active {
  background: rgba(74, 171, 194, 0.2);
  border-color: rgba(74, 171, 194, 0.4);
  box-shadow: 0 0 20px rgba(74, 171, 194, 0.3);
}