* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    background: white;
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    overflow: hidden;
}

header {
    background: linear-gradient(135deg, #ff6b6b 0%, #feca57 100%);
    color: white;
    padding: 20px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header h1 {
    font-size: 24px;
    font-weight: 600;
}

.status {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
}

.status-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: #4ade80;
    animation: pulse 2s infinite;
}

.status-offline .status-dot {
    background: #ef4444;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.config-panel {
    background: #f8fafc;
    padding: 20px 30px;
    border-bottom: 1px solid #e2e8f0;
}

.config-panel h3 {
    margin-bottom: 15px;
    color: #64748b;
    font-size: 16px;
}

.config-item {
    margin-bottom: 15px;
}

.config-item label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
    color: #475569;
}

.config-item input {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid #cbd5e1;
    border-radius: 8px;
    font-size: 14px;
}

.config-item small {
    display: block;
    margin-top: 4px;
    color: #94a3b8;
    font-size: 12px;
}

button {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    margin-right: 10px;
}

button:first-child {
    background: #3b82f6;
    color: white;
}

button:hover:first-child {
    background: #2563eb;
}

button.secondary {
    background: #e2e8f0;
    color: #475569;
}

button.secondary:hover {
    background: #cbd5e1;
}

.chat-container {
    display: flex;
    flex-direction: column;
    height: 600px;
}

.messages {
    flex: 1;
    overflow-y: auto;
    padding: 20px 30px;
    background: #fafafa;
}

.message {
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
}

.message.user {
    flex-direction: row-reverse;
}

.avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: #e0e7ff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    flex-shrink: 0;
}

.message.user .avatar {
    background: #dbeafe;
}

.content {
    max-width: 70%;
    padding: 12px 16px;
    border-radius: 18px;
    line-height: 1.5;
    word-wrap: break-word;
}

.message.assistant .content {
    background: white;
    border: 1px solid #e2e8f0;
    border-top-left-radius: 4px;
}

.message.user .content {
    background: #3b82f6;
    color: white;
    border-top-right-radius: 4px;
}

.input-area {
    padding: 20px 30px;
    background: white;
    border-top: 1px solid #e2e8f0;
}

textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid #cbd5e1;
    border-radius: 8px;
    font-size: 14px;
    resize: vertical;
    min-height: 60px;
    font-family: inherit;
}

textarea:focus {
    outline: none;
    border-color: #3b82f6;
}

.button-row {
    display: flex;
    gap: 10px;
    margin-top: 10px;
}

.hidden {
    display: none;
}

.typing-indicator {
    display: flex;
    gap: 4px;
    padding: 12px 16px;
    background: white;
    border: 1px solid #e2e8f0;
    border-radius: 18px;
    border-top-left-radius: 4px;
    width: fit-content;
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    background: #cbd5e1;
    border-radius: 50%;
    animation: bounce 1.4s infinite;
}

.typing-indicator span:nth-child(2) { animation-delay: 0.2s; }
.typing-indicator span:nth-child(3) { animation-delay: 0.4s; }

@keyframes bounce {
    0%, 60%, 100% { transform: translateY(0); }
    30% { transform: translateY(-10px); }
}

@media (max-width: 600px) {
    body { padding: 10px; }
    .container { border-radius: 12px; }
    header { flex-direction: column; gap: 10px; text-align: center; }
    .config-panel, .messages, .input-area { padding: 15px; }
    .content { max-width: 85%; }
}