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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background: white;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    overflow: hidden;
}

header {
    background: #2c3e50;
    color: white;
    padding: 25px;
    text-align: center;
}

header h1 {
    margin-bottom: 8px;
    font-size: 2.2em;
}

header p {
    opacity: 0.8;
}

.chat-container {
    height: 70vh;
    display: flex;
    flex-direction: column;
}

.chat-history {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
    background: #f8f9fa;
}

.message {
    margin-bottom: 15px;
    padding: 12px 18px;
    border-radius: 18px;
    max-width: 80%;
    word-wrap: break-word;
    animation: fadeIn 0.3s ease-in;
}

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

.user-message {
    background: #007bff;
    color: white;
    margin-left: auto;
    border-bottom-right-radius: 5px;
}

.ai-message {
    background: #e9ecef;
    color: #333;
    margin-right: auto;
    border-bottom-left-radius: 5px;
}

.message-time {
    font-size: 0.8em;
    opacity: 0.7;
    margin-top: 5px;
}

.input-section {
    padding: 20px;
    background: white;
    border-top: 1px solid #eee;
}

.input-group {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
}

.input-group input {
    flex: 1;
    padding: 12px 16px;
    border: 2px solid #ddd;
    border-radius: 25px;
    font-size: 16px;
    outline: none;
    transition: border-color 0.3s;
}

.input-group input:focus {
    border-color: #007bff;
}

.input-group button {
    padding: 12px 25px;
    background: #007bff;
    color: white;
    border: none;
    border-radius: 25px;
    cursor: pointer;
    font-size: 16px;
    transition: background 0.3s;
}

.input-group button:hover {
    background: #0056b3;
}

.controls {
    display: flex;
    gap: 10px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn-secondary {
    padding: 8px 16px;
    background: #6c757d;
    color: white;
    border: none;
    border-radius: 15px;
    cursor: pointer;
    font-size: 14px;
    transition: background 0.3s;
}

.btn-secondary:hover {
    background: #545b62;
}

.typing-indicator {
    padding: 12px 18px;
    color: #666;
    font-style: italic;
}

/* Scrollbar styling */
.chat-history::-webkit-scrollbar {
    width: 6px;
}

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

.chat-history::-webkit-scrollbar-thumb {
    background: #c1c1c1;
    border-radius: 3px;
}

.chat-history::-webkit-scrollbar-thumb:hover {
    background: #a8a8a8;
}