html,
body {
    height: 100%;
    margin: 0;
}

body {
    font-family: Arial, sans-serif;
    background: #fff4f7;
    padding: 16px;
    box-sizing: border-box;
}

.chat-container {
    width: 100%;
    max-width: 720px;

    margin: 0 auto;

    background: white;
    border-radius: 16px;
    padding: 20px;

    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);

    display: flex;
    flex-direction: column;

    min-height: calc(100dvh - 32px);

    box-sizing: border-box;
}

h1 {
    margin: 0 0 16px 0;
    text-align: center;
    color: #333;
}

.chat-box {
    flex: 1;
    overflow-y: auto;

    border: 1px solid #eee;
    border-radius: 12px;

    padding: 16px;

    background: #fafafa;

    min-height: 300px;
}

.message {
    max-width: 80%;
    padding: 10px 14px;
    border-radius: 14px;
    margin: 10px 0;

    word-wrap: break-word;
    white-space: pre-wrap;
    line-height: 1.5;
}

.user {
    background: #dbeafe;
    margin-left: auto;
}

.bot {
    background: #ffe4ec;
    margin-right: auto;
}

.thinking-shadow {
    max-width: 70%;

    padding: 8px 12px;
    margin: 8px 0;

    border-radius: 10px;

    font-size: 13px;
    font-style: italic;

    color: #6b7280;

    background: rgba(255, 255, 255, 0.6);

    border: 1px dashed #e5e7eb;

    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);

    margin-right: auto;
}

.input-area {
    display: flex;
    gap: 8px;

    margin-top: 16px;
}

input {
    flex: 1;

    padding: 12px;

    border-radius: 8px;
    border: 1px solid #ccc;

    font-size: 16px; /* Prevent mobile auto zoom */

    box-sizing: border-box;
}

input:focus {
    outline: none;
    border-color: #ff6b9a;
}

button {
    padding: 12px 18px;

    border: none;
    border-radius: 8px;

    background: #ff6b9a;
    color: white;

    cursor: pointer;

    font-weight: 600;
}

button:hover {
    background: #ff4f86;
}

@media (max-width: 768px) {

    body {
        padding: 10px;
    }

    .chat-container {
        max-width: 100%;

        padding: 14px;

        border-radius: 12px;

        min-height: calc(100dvh - 20px);
    }

    .chat-box {
        padding: 12px;
    }

    .message {
        max-width: 88%;
        font-size: 14px;
    }

    h1 {
        font-size: 20px;
    }

    button {
        padding: 12px 14px;
    }
}