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

body {
    font-family: Arial, sans-serif;
    min-height: 100vh;
    background: linear-gradient(135deg, #07111f, #102a43);
    color: white;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.container {
    width: 100%;
    max-width: 700px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 24px;
    padding: 35px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
}

.logo {
    font-size: 45px;
    text-align: center;
    margin-bottom: 10px;
}

h1 {
    text-align: center;
    font-size: 32px;
    margin-bottom: 8px;
}

.subtitle {
    text-align: center;
    color: #b9c9d8;
    margin-bottom: 30px;
}

.chat-box {
    background: rgba(0, 0, 0, 0.2);
    border-radius: 18px;
    padding: 20px;
    min-height: 180px;
    margin-bottom: 20px;
}

.message {
    background: rgba(255, 255, 255, 0.1);
    padding: 15px;
    border-radius: 12px;
    margin-bottom: 12px;
}

.input-area {
    display: flex;
    gap: 10px;
}

input {
    flex: 1;
    padding: 15px;
    border: none;
    border-radius: 12px;
    outline: none;
    font-size: 16px;
}

button {
    padding: 15px 22px;
    border: none;
    border-radius: 12px;
    background: #00a8e8;
    color: white;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
}

button:hover {
    opacity: 0.85;
}

.features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    margin-top: 25px;
}

.feature {
    padding: 15px;
    background: rgba(255, 255, 255, 0.07);
    border-radius: 12px;
    text-align: center;
}

@media (max-width: 600px) {
    .container {
        padding: 22px;
    }

    h1 {
        font-size: 25px;
    }

    .input-area {
        flex-direction: column;
    }

    .features {
        grid-template-columns: 1fr;
    }
}