.cipher-container {
    max-width: 700px;
    margin: 0 auto;
    padding: 1em;
    background: #f8f8f8;
    border-radius: 10px;
}

.mode-select {
    text-align: center;
    margin-bottom: 1em;
}

.mode-select label {
    margin: 0 1em;
    font-weight: bold;
}

.input-group {
    margin-bottom: 1em;
}

.input-group label {
    display: block;
    margin-bottom: 0.5em;
    font-weight: bold;
}

textarea {
    width: 100%;
    height: 100px;
    font-size: 1em;
    padding: 0.6em;
    border-radius: 8px;
    border: 1px solid #ccc;
    resize: vertical;
    box-sizing: border-box;
    font-family: "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif;
}


textarea[readonly] {
    background: #eee;
}

.button-row {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    margin-top: 0.5em;
}

.button-row button, .generate-btn {
    padding: 0.5em 1.2em;
    font-size: 1em;
    border: none;
    border-radius: 8px;
    background: #4a90e2;
    color: white;
    cursor: pointer;
    transition: background 0.3s;
}

.button-row button:hover, .generate-btn:hover {
    background: #357ab8;
}

.generate-btn {
    display: block;
    margin: 1em auto 0 auto;
}