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

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

.chat-container {
    max-width: 900px;
    margin: 0 auto;
    height: 100vh;
    display: flex;
    flex-direction: column;
    background: white;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.chat-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 2rem;
    text-align: center;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.chat-header h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.chat-header p {
    opacity: 0.9;
    font-size: 1rem;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 2rem;
    background: #f7f9fc;
    scroll-behavior: smooth;
}

.welcome-message {
    text-align: center;
    padding: 4rem 2rem;
    color: #4a5568;
}

.welcome-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

.welcome-message h2 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
    color: #2d3748;
}

.welcome-message p {
    font-size: 1.1rem;
    opacity: 0.8;
}

.message {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    animation: fadeIn 0.3s ease-in;
}

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

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

.message-avatar {
    flex-shrink: 0;
}

.avatar-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    font-size: 1.5rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.message.user .avatar-icon {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.message-content {
    max-width: 70%;
}

.message-text {
    padding: 1rem 1.25rem;
    border-radius: 1rem;
    line-height: 1.6;
    font-size: 1rem;
    word-wrap: break-word;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.message.user .message-text {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-bottom-right-radius: 0.25rem;
}

.message.assistant .message-text {
    background: white;
    color: #2d3748;
    border-bottom-left-radius: 0.25rem;
    border: 1px solid #e2e8f0;
}

.message-time {
    font-size: 0.75rem;
    color: #a0aec0;
    margin-top: 0.25rem;
    padding: 0 0.5rem;
}

.message.user .message-time {
    text-align: right;
}

.typing-indicator {
    display: flex;
    gap: 0.5rem;
    padding: 1rem 1.25rem;
    background: white;
    border-radius: 1rem;
    border: 1px solid #e2e8f0;
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #cbd5e0;
    animation: typing 1.4s infinite;
}

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

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

@keyframes typing {
    0%, 60%, 100% {
        transform: translateY(0);
        opacity: 0.7;
    }
    30% {
        transform: translateY(-10px);
        opacity: 1;
    }
}

.chat-input-container {
    padding: 1.5rem;
    background: white;
    border-top: 1px solid #e2e8f0;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.05);
}

.chat-input-wrapper {
    display: flex;
    gap: 1rem;
    max-width: 800px;
    margin: 0 auto;
    align-items: flex-end;
}

.chat-input {
    flex: 1;
    padding: 1rem 1.25rem;
    border: 2px solid #e2e8f0;
    border-radius: 1.5rem;
    font-size: 1rem;
    font-family: inherit;
    resize: none;
    max-height: 150px;
    transition: all 0.3s ease;
}

.chat-input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.chat-input:disabled {
    background: #f7fafc;
    cursor: not-allowed;
}

.send-button {
    width: 48px;
    height: 48px;
    border: none;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    flex-shrink: 0;
}

.send-button:hover:not(:disabled) {
    transform: scale(1.1);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.send-button:active:not(:disabled) {
    transform: scale(0.95);
}

.send-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.send-button svg {
    width: 24px;
    height: 24px;
}

/* Scrollbar Styling */
.chat-messages::-webkit-scrollbar {
    width: 8px;
}

.chat-messages::-webkit-scrollbar-track {
    background: #f1f1f1;
}

.chat-messages::-webkit-scrollbar-thumb {
    background: #cbd5e0;
    border-radius: 4px;
}

.chat-messages::-webkit-scrollbar-thumb:hover {
    background: #a0aec0;
}

/* Responsive Design */
@media (max-width: 768px) {
    .chat-container {
        height: 100vh;
        max-width: 100%;
    }

    .chat-header h1 {
        font-size: 1.5rem;
    }

    .chat-messages {
        padding: 1rem;
    }

    .message-content {
        max-width: 85%;
    }

    .chat-input-container {
        padding: 1rem;
    }
}