/* Base64 工具共用输入、模式切换、结果和图片预览样式，业务脚本不承担布局职责。 */
.base64-workspace {
    max-width: 960px;
}

.base64-mode {
    display: inline-grid;
    grid-template-columns: repeat(2, minmax(112px, 1fr));
    box-sizing: border-box;
    max-width: 100%;
    margin: 0 0 16px;
    padding: 3px;
    background: var(--line);
    border-radius: 6px;
}

.base64-mode label {
    position: relative;
    cursor: pointer;
}

.base64-mode input {
    position: absolute;
    opacity: 0;
}

.base64-mode span {
    display: grid;
    min-height: var(--tool-control-height);
    padding: var(--tool-control-padding) 12px;
    place-items: center;
    border-radius: 4px;
    color: var(--muted);
    font-weight: 750;
    text-align: center;
    font-size: 14px;
    line-height: 22px;
}

.base64-mode input:checked + span {
    color: var(--ink);
    background: var(--surface);
    box-shadow: 0 1px 3px rgba(34, 37, 34, 0.12);
}

.base64-mode input:focus-visible + span {
    outline: 3px solid var(--eye);
    outline-offset: 3px;
}

.base64-panel {
    display: grid;
    gap: 10px;
}

.base64-panel[hidden] {
    display: none;
}

.base64-panel > label,
.base64-field > label {
    font-weight: 750;
}

.base64-textarea,
.base64-input,
.base64-select {
    width: 100%;
    color: var(--ink);
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 4px;
    font: inherit;
    font-size: var(--tool-input-font);
    line-height: 22px;
}

.base64-textarea {
    height: var(--tool-editor-height);
    min-height: 96px;
    padding: 14px;
    resize: vertical;
    font: 13px/1.65 Consolas, "Courier New", monospace;
}

.base64-textarea.output {
    background: var(--surface-soft);
}

.base64-input,
.base64-select {
    min-height: var(--tool-control-height);
    padding: var(--tool-control-padding) 12px;
}

.base64-textarea:focus,
.base64-input:focus,
.base64-select:focus {
    border-color: var(--forest);
    outline: 3px solid var(--focus-ring);
}

.base64-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.base64-field {
    display: grid;
    gap: 8px;
    min-width: 0;
}

.base64-hint,
.base64-status,
.base64-file-summary {
    min-height: 22px;
    margin: 0;
    color: var(--muted);
    font-size: 13px;
}

.base64-check {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-top: 6px;
    font-size: 14px;
    font-weight: 700;
}

.base64-check input {
    width: 17px;
    height: 17px;
    margin: 0;
    accent-color: var(--orange-dark);
}

.base64-result {
    margin-top: 20px;
    padding-top: 16px;
    border-top: 1px solid var(--line);
}

.base64-result h2 {
    margin: 0 0 14px;
    font-size: 18px;
}

.base64-preview {
    display: grid;
    min-height: 180px;
    margin-top: 18px;
    padding: 20px;
    place-items: center;
    background: var(--surface-soft);
    border: 1px solid var(--line);
}

.base64-preview img {
    max-height: 420px;
    object-fit: contain;
}

.base64-preview[hidden] {
    display: none;
}

@media (max-width: 760px) {
    .base64-grid {
        grid-template-columns: 1fr;
        gap: 18px;
    }

    .base64-mode {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        width: 100%;
    }
}

@media (max-width: 420px) {
    .base64-textarea {
        min-height: 96px;
    }
}

@media (max-width: 360px) {
    .base64-mode { grid-template-columns: 1fr; }
}