:root {
    font-family: "Vazirmatn", "IRANSans", system-ui, sans-serif;
    color: #0f172a;
    background-color: #0f172a;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 24px;
    background: radial-gradient(circle at top, #1e293b, #0f172a 65%);
}

.app-container {
    width: min(960px, 100%);
    min-height: 80vh;
    background: #f8fafc;
    border-radius: 24px;
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    box-shadow: 0 30px 60px rgba(15, 23, 42, 0.35);
}

.app-header {
    text-align: center;
}

.app-header h1 {
    margin: 0;
    font-size: 1.8rem;
    color: #0f172a;
}

.app-header p {
    margin: 6px 0 0;
    color: #475569;
}

.chat-box {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding: 8px;
}

.message {
    display: flex;
    gap: 12px;
    background: #fff;
    border-radius: 16px;
    padding: 12px 16px;
    border: 1px solid #e2e8f0;
    box-shadow: 0 8px 20px rgba(15, 23, 42, 0.05);
}

.message.user {
    flex-direction: row-reverse;
    background: #e0f2fe;
    border-color: #bae6fd;
}

.message-avatar {
    width: 40px;
    height: 40px;
    border-radius: 999px;
    background: linear-gradient(180deg, #0ea5e9, #0369a1);
}

.message.user .message-avatar {
    background: linear-gradient(180deg, #f97316, #ea580c);
}

.message-body {
    flex: 1;
}

.message-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
    font-size: 0.85rem;
    color: #475569;
}

.message-text {
    margin: 0;
    line-height: 1.8;
    white-space: pre-wrap;
    color: #0f172a;
}

.chat-form {
    display: flex;
    gap: 12px;
    padding-top: 8px;
    border-top: 1px solid #e2e8f0;
}

.chat-form input {
    flex: 1;
    border: 1px solid #cbd5f5;
    border-radius: 16px;
    padding: 12px 16px;
    font-size: 1rem;
    background: #fff;
}

.chat-form button {
    border: none;
    border-radius: 16px;
    padding: 12px 24px;
    font-size: 1rem;
    background: linear-gradient(120deg, #2563eb, #7c3aed);
    color: #fff;
    cursor: pointer;
    transition: opacity 0.2s ease;
}

.chat-form button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

@media (max-width: 680px) {
    body {
        padding: 12px;
    }

    .app-container {
        padding: 16px;
    }

    .chat-form {
        flex-direction: column;
    }

    .chat-form button {
        width: 100%;
    }
}