* {
    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;
    color: #333;
}

/* Landing Page */
.landing {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.container {
    text-align: center;
    max-width: 400px;
}

.logo {
    font-size: 80px;
    margin-bottom: 20px;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

h1 {
    color: white;
    font-size: 2.5rem;
    margin-bottom: 10px;
    font-weight: 700;
}

.tagline {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.1rem;
    margin-bottom: 40px;
}

.features {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-bottom: 40px;
}

.feature {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    padding: 15px 25px;
    border-radius: 50px;
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    font-size: 1rem;
}

.feature .icon {
    font-size: 1.3rem;
}

.cta-button {
    background: white;
    color: #667eea;
    border: none;
    padding: 18px 40px;
    font-size: 1.2rem;
    font-weight: 600;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.3);
}

.note {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
    margin-top: 30px;
}

/* Chat Section */
.chat-section {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: #f5f5f5;
    display: flex;
    flex-direction: column;
}

.chat-section.hidden {
    display: none;
}

.chat-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 15px 20px;
    display: flex;
    align-items: center;
    gap: 15px;
}

.back-button {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: white;
    padding: 8px 15px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.9rem;
}

.chat-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
}

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

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

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.message {
    max-width: 80%;
    padding: 12px 18px;
    border-radius: 20px;
    line-height: 1.5;
    animation: fadeIn 0.3s ease;
}

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

.message.bot {
    background: white;
    align-self: flex-start;
    border-bottom-left-radius: 5px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.message.user {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    align-self: flex-end;
    border-bottom-right-radius: 5px;
}

.message.typing {
    background: white;
    align-self: flex-start;
    border-bottom-left-radius: 5px;
}

.typing-indicator {
    display: flex;
    gap: 5px;
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    background: #667eea;
    border-radius: 50%;
    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%, 100% { transform: translateY(0); }
    50% { transform: translateY(-5px); }
}

.chat-input-area {
    padding: 15px 20px;
    background: white;
    display: flex;
    gap: 10px;
    border-top: 1px solid #eee;
}

#messageInput {
    flex: 1;
    padding: 12px 20px;
    border: 2px solid #eee;
    border-radius: 25px;
    font-size: 1rem;
    outline: none;
    transition: border-color 0.3s;
}

#messageInput:focus {
    border-color: #667eea;
}

.send-button {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 12px 25px;
    border-radius: 25px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s;
}

.send-button:hover {
    transform: scale(1.05);
}

/* Mobile Responsive */
@media (max-width: 480px) {
    h1 {
        font-size: 2rem;
    }
    
    .logo {
        font-size: 60px;
    }
    
    .cta-button {
        padding: 15px 30px;
        font-size: 1.1rem;
    }
    
    .message {
        max-width: 85%;
    }
}