* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #0f172a;
    color: #e2e8f0;
}

.app {
    max-width: 900px;
    margin: 40px auto;
    padding: 16px;
}

.topbar {
    margin-bottom: 16px;
}

.chat-box {
    height: 500px;
    overflow-y: auto;
    background: #111827;
    border: 1px solid #334155;
    border-radius: 12px;
    padding: 12px;
    margin-bottom: 12px;
}

.load-older-btn {
    margin-bottom: 10px;
    padding: 10px 14px;
    border: none;
    border-radius: 10px;
    background: #334155;
    color: #fff;
    cursor: pointer;
}

.message {
    padding: 10px 12px;
    margin-bottom: 10px;
    background: #1e293b;
    border-radius: 10px;
}

.meta {
    font-size: 12px;
    color: #94a3b8;
    margin-bottom: 4px;
}

.reply-preview {
    font-size: 12px;
    color: #cbd5e1;
    border-left: 3px solid #64748b;
    padding-left: 8px;
    margin-bottom: 8px;
}

.text {
    word-break: break-word;
}

.chat-image {
    max-width: 250px;
    max-height: 250px;
    border-radius: 10px;
    margin-top: 8px;
    display: block;
}

.message-actions,
.reactions {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 8px;
}

.message-actions button,
.reactions button,
.reply-banner button {
    border: none;
    padding: 6px 10px;
    border-radius: 8px;
    cursor: pointer;
}

.message-actions button {
    background: #334155;
    color: #fff;
}

.reactions button {
    background: #0b1220;
    color: #fff;
    border: 1px solid #334155;
}

.chat-form {
    display: grid;
    grid-template-columns: 180px 1fr 1fr 110px;
    gap: 10px;
}

.chat-form input,
.chat-form button {
    padding: 12px;
    border-radius: 10px;
    border: 1px solid #334155;
    font-size: 14px;
}

.chat-form input {
    background: #0b1220;
    color: #e2e8f0;
}

.chat-form button {
    background: #2563eb;
    color: white;
    cursor: pointer;
    border: none;
}

.small-note {
    color: #94a3b8;
    font-size: 13px;
    margin-top: 8px;
}

.status {
    min-height: 20px;
    color: #fca5a5;
    margin-top: 10px;
}

.reply-banner {
    margin-bottom: 10px;
    padding: 10px;
    background: #1e293b;
    border-radius: 10px;
}

.hidden {
    display: none;
}

@media (max-width: 800px) {
    .chat-form {
        grid-template-columns: 1fr;
    }
}