.pisachub-app-fullscreen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    height: 100dvh;
    background: #f7f3ea;
    display: flex;
    flex-direction: column;
}

.pisachub-app-header {
    background: #1F5F57;
    color: #fff;
    padding: 16px 20px;
    font-weight: 700;
    font-size: 18px;
    display: flex;
    align-items: center;
    gap: 10px;
    padding-top: env(safe-area-inset-top, 16px);
    flex-shrink: 0;
}

.pisachub-app-header img {
    width: 28px;
    height: 28px;
    border-radius: 50%;
}

.pisachub-app-messages {
    flex: 1;
    overflow-y: auto;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    -webkit-overflow-scrolling: touch;
}

.pisachub-app-input-area {
    display: flex;
    padding: 12px;
    gap: 8px;
    border-top: 1px solid #e0dcd0;
    background: #fff;
    padding-bottom: env(safe-area-inset-bottom, 12px);
    flex-shrink: 0;
}

.pisachub-app-input {
    flex: 1;
    border: 1px solid #ccc;
    border-radius: 20px;
    padding: 12px 16px;
    font-size: 16px;
    outline: none;
}

.pisachub-app-send {
    background: #1F5F57;
    color: #fff;
    border: none;
    border-radius: 20px;
    padding: 0 20px;
    cursor: pointer;
    font-weight: 600;
    font-size: 15px;
}