#sts-receiver {
    max-width: 480px;
    margin: 24px auto;
    padding: 16px;
    font-family: inherit;
}

#sts-loading,
#sts-empty {
    text-align: center;
    color: #666;
    padding: 40px 16px;
}

#sts-preview h2 {
    font-size: 18px;
    margin-bottom: 12px;
}

#sts-preview-card {
    display: flex;
    flex-direction: column;
    background: #f4f6f8;
    border: 1px solid #e2e5e8;
    border-radius: 12px;
    overflow: hidden;
    margin-bottom: 16px;
}

#sts-preview-image-wrap {
    width: 100%;
    max-height: 220px;
    overflow: hidden;
    background: #000;
}

#sts-preview-image {
    width: 100%;
    max-height: 220px;
    object-fit: cover;
    display: block;
}

#sts-preview-text {
    min-width: 0;
    padding: 12px 14px;
}

#sts-preview-title {
    display: block;
    font-size: 15px;
    margin-bottom: 4px;
}

#sts-preview-body {
    font-size: 13px;
    color: #555;
    margin: 0 0 6px;
}

#sts-preview-domain {
    font-size: 12px;
    color: #3c96c6;
    word-break: break-all;
}

#sts-destination-choice {
    display: flex;
    gap: 10px;
    margin-bottom: 16px;
}

.sts-choice-btn {
    flex: 1;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 10px;
    background: #fff;
    font-size: 14px;
    cursor: pointer;
    transition: background 0.15s ease, border-color 0.15s ease;
}

.sts-choice-btn:hover {
    background: #f4f6f8;
    border-color: #3c96c6;
}

#sts-chat-picker {
    margin-bottom: 12px;
}

#sts-chat-search {
    width: 100%;
    box-sizing: border-box;
    padding: 10px 12px;
    border: 1px solid #ddd;
    border-radius: 20px;
    margin-bottom: 8px;
    font-size: 14px;
}

#sts-chat-results {
    max-height: 280px;
    overflow-y: auto;
}

.sts-chat-user-row {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 6px;
    border-radius: 8px;
    cursor: pointer;
}

.sts-chat-user-row:hover {
    background: #f4f6f8;
}

.sts-chat-user-row img {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    object-fit: cover;
}

.sts-chat-user-row.sts-sending {
    opacity: 0.5;
    pointer-events: none;
}

.sts-no-results {
    color: #888;
    font-size: 13px;
    text-align: center;
    padding: 12px;
}

#sts-status {
    font-size: 14px;
    text-align: center;
    min-height: 20px;
}

#sts-activity-compose {
    margin-bottom: 16px;
}

#sts-activity-thumb-wrap {
    margin-bottom: 10px;
}

#sts-activity-thumb {
    max-width: 160px;
    max-height: 160px;
    border-radius: 8px;
    object-fit: cover;
    display: block;
}

#sts-activity-text {
    width: 100%;
    box-sizing: border-box;
    padding: 10px 12px;
    border: 1px solid #ddd;
    border-radius: 10px;
    font-size: 14px;
    font-family: inherit;
    resize: vertical;
    margin-bottom: 10px;
}

.sts-publish-btn {
    width: 100%;
    background: #3c96c6;
    color: #fff;
    border-color: #3c96c6;
}

.sts-publish-btn:hover {
    background: #2f7ba5;
}

.sts-publish-btn:disabled {
    opacity: 0.6;
    cursor: default;
}