/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans', Helvetica, Arial, sans-serif;
    font-size: 14px;
    line-height: 1.5;
    color: #1f2328;
    background-color: #ffffff;
    padding: 24px;
}

/* Container */
.container {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* Card base styles */
.messages-card,
.content-card {
    background-color: #ffffff;
    border: 1px solid #d0d7de;
    border-radius: 6px;
    box-shadow: 0 1px 0 rgba(0, 0, 0, 0.04);
}

/* Header inside card */
.card-header {
    background-color: #f6f8fa;
    padding: 16px;
    border-bottom: 1px solid #d0d7de;
    font-weight: 600;
    color: #1f2328;
}

/* Card content */
.card-content {
    padding: 20px;
}

/* Messages list */
.messages-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.message-item {
    background-color: #f6f8fa;
    border: 1px solid #d0d7de;
    border-radius: 6px;
    padding: 12px 16px;
    margin-bottom: 8px;
    font-size: 14px;
    color: #24292f;
}

.message-item:last-child {
    margin-bottom: 0;
}

/* Content card */
.content-card {
    padding: 0;
    /* Header and content already padded separately */
    min-height: 150px;
}

/* Responsive */
@media (max-width: 768px) {
    body {
        padding: 16px;
    }

    .container {
        gap: 16px;
    }

    .card-header,
    .card-content {
        padding: 16px;
    }

    .message-item {
        padding: 10px 12px;
        font-size: 13px;
    }
}