:root {
  --bg-color-start: #0f0c29;
  --bg-color-mid: #302b63;
  --bg-color-end: #24243e;
  --surface-color: rgba(28, 28, 32, 0.7);
  --glass-border-color: rgba(255, 255, 255, 0.1);
  --primary-gradient: linear-gradient(45deg, #8a2be2, #4a00e0);
  --text-color: #f0f0f0;
  --text-muted: #a0a0a0;
  --glow-color: rgba(74, 0, 224, 0.8);

  --blur-strength: 12px;
  --border-radius: 16px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; }

body {
  font-family: 'Inter', sans-serif;
  background: #111;
  color: var(--text-color);
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  padding: 1rem;
  overflow: hidden;
}

.background-aurora {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: radial-gradient(circle at 10% 20%, var(--bg-color-start) 0%, transparent 40%),
              radial-gradient(circle at 80% 90%, var(--bg-color-mid) 0%, transparent 50%),
              radial-gradient(circle at 50% 50%, var(--bg-color-end) 0%, transparent 30%);
  animation: aurora-flow 25s infinite linear;
  filter: blur(50px);
  z-index: -1;
}

@keyframes aurora-flow {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.chat-container {
  width: 100%;
  max-width: 768px;
  height: 95vh;
  background: var(--surface-color);
  border-radius: var(--border-radius);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid var(--glass-border-color);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(var(--blur-strength));
  -webkit-backdrop-filter: blur(var(--blur-strength));
}

.chat-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--glass-border-color);
  flex-shrink: 0;
}
.chat-header h1 {
  font-size: 1.25rem;
  font-weight: 600;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
#clear-chat-btn {
  background: none; border: none; color: var(--text-muted); cursor: pointer;
  transition: all 0.2s ease;
  padding: 0.5rem;
  border-radius: 50%;
}
#clear-chat-btn:hover { color: #ff7b7b; background: rgba(255, 123, 123, 0.1); transform: rotate(15deg); }

.chat-messages {
  flex-grow: 1;
  padding: 1.5rem;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.chat-messages::-webkit-scrollbar { width: 8px; }
.chat-messages::-webkit-scrollbar-track { background: transparent; }
.chat-messages::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.2);
  border-radius: 4px;
}
.chat-messages::-webkit-scrollbar-thumb:hover { background: rgba(255, 255, 255, 0.3); }

.message {
  display: flex;
  gap: 1rem;
  max-width: 85%;
  animation: fadeIn 0.5s ease-out;
}
.message-avatar {
  width: 40px; height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center; justify-content: center;
  flex-shrink: 0;
  background: rgba(0, 0, 0, 0.3);
  color: var(--text-color);
}
.message-content {
  padding: 1rem;
  border-radius: 12px;
  word-wrap: break-word;
  line-height: 1.6;
  background: rgba(0, 0, 0, 0.2);
}
.user { align-self: flex-end; flex-direction: row-reverse; }
.user .message-content {
  background: var(--primary-gradient);
  color: white;
  border-top-right-radius: 4px;
}
.bot { align-self: flex-start; }
.bot .message-content { border-top-left-radius: 4px; }
.bot img {
  max-width: 100%; border-radius: 8px; margin-top: 0.75rem;
  display: block; background: rgba(0,0,0,0.2);
}
.image-actions { display: flex; gap: 0.5rem; margin-top: 1rem; }
.action-btn {
  background: rgba(255,255,255,0.1); border: 1px solid transparent;
  color: var(--text-color); padding: 0.5rem 0.75rem; border-radius: 6px;
  cursor: pointer; transition: all 0.2s ease; font-size: 0.8rem;
  text-decoration: none; display: inline-flex; align-items: center;
}
.action-btn:hover { background: rgba(255,255,255,0.2); border-color: var(--glass-border-color); }

.skeleton-wrapper { display: flex; gap: 1rem; align-self: flex-start; }
.skeleton {
  background: rgba(0,0,0,0.2);
  border-radius: 12px;
  position: relative;
  overflow: hidden;
  width: 300px; height: 300px;
}
.skeleton::after {
  content: ''; position: absolute; top: 0; left: -150%;
  width: 150%; height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.08), transparent);
  animation: shimmer 2s infinite;
}
@keyframes shimmer { 100% { left: 150%; } }

.chat-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--glass-border-color);
  background: var(--surface-color);
  flex-shrink: 0;
}
#chat-form { display: flex; align-items: flex-end; gap: 0.75rem; }

#prompt-input {
  flex-grow: 1;
  background: rgba(0, 0, 0, 0.2);
  color: var(--text-color);
  border: 1px solid transparent;
  border-radius: 12px;
  padding: 0.8rem 1rem;
  font-size: 1rem; resize: none;
  font-family: 'Inter', sans-serif;
  transition: all 0.3s ease;
  max-height: 100px; line-height: 1.5;
}
#prompt-input:focus {
  outline: none;
  background: rgba(0, 0, 0, 0.3);
  border-color: var(--glass-border-color);
  box-shadow: 0 0 15px 5px var(--glow-color);
}

#send-btn {
  background: var(--primary-gradient);
  color: white; border: none; border-radius: 12px;
  width: 48px; height: 48px; flex-shrink: 0;
  cursor: pointer; transition: all 0.3s ease;
  display: flex; align-items: center; justify-content: center;
}
#send-btn:hover {
  transform: scale(1.1);
  box-shadow: 0 0 10px var(--glow-color);
}
#send-btn:disabled {
  background: #555; cursor: not-allowed;
  transform: scale(1); box-shadow: none;
}

.error-box {
  background: rgba(211, 47, 47, 0.8);
  backdrop-filter: blur(5px);
  border: 1px solid rgba(255, 120, 120, 0.5);
  color: white; padding: 1rem;
  margin: 0 1.5rem 1rem; border-radius: 12px;
  text-align: center; animation: fadeIn 0.3s;
  font-size: 0.9rem;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px) scale(0.98); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}