/* ========================================
   Base64 工具样式
   ======================================== */

/* 主内容 */
.main-content { width: 100%; max-width: 1000px; height: calc(100vh - 120px); display: flex; align-items: center; padding: 0 20px; padding-bottom: 50px; z-index: 10; }
.container { width: 100%; }
.tool-card { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: var(--radius-xl); overflow: hidden; display: flex; flex-direction: column; height: 100%; }

/* 顶部标签 */
.tabs { display: flex; border-bottom: 1px solid var(--border-color); background: var(--ink-20); flex-shrink: 0; }
.tab-btn { flex: 1; padding: 14px; background: none; border: none; color: var(--text-secondary); cursor: pointer; transition: 0.2s; font-size: 14px; border-bottom: 2px solid transparent; }
.tab-btn:hover { background: var(--paper-03); color: var(--text-primary); }
.tab-btn.active { color: var(--primary-color); border-bottom-color: var(--primary-color); background: rgba(20, 184, 166, 0.05); }

/* 面板通用 */
.panel { display: none; flex: 1; flex-direction: column; overflow-y: auto; padding: 20px; gap: 16px; }
.panel.active { display: flex; }

/* 输入输出组 */
.io-group { flex: 1; display: flex; flex-direction: column; min-height: 0; }
.io-header { display: flex; justify-content: space-between; align-items: center; padding: 6px 0; font-size: 12px; color: var(--text-muted); }
.io-textarea { flex: 1; min-height: 80px; background: var(--ink-20); border: 1px solid var(--border-color); border-radius: var(--radius-md); color: var(--text-primary); padding: 12px; resize: none; outline: none; font-family: var(--font-mono); font-size: 13px; line-height: 1.4; overflow-wrap: break-word; word-break: break-all; }
.io-textarea:focus { border-color: var(--primary-color); }

/* 操作栏 */
.action-bar { display: flex; justify-content: center; gap: 12px; align-items: center; }
.btn-action { padding: 10px 20px; border-radius: var(--radius-md); border: none; cursor: pointer; font-weight: 500; display: flex; align-items: center; gap: 6px; transition: 0.2s; background: var(--primary-color); color: white; }
.btn-action:hover { filter: brightness(1.1); transform: translateY(-1px); }
.btn-action.secondary { background: var(--paper-10); color: var(--text-primary); }
.btn-action.block { width: 100%; justify-content: center; margin-top: 8px; }
.btn-icon { background: none; border: none; color: var(--text-muted); cursor: pointer; padding: 4px 8px; border-radius: 4px; transition: 0.2s; }
.btn-icon:hover { color: var(--primary-color); background: var(--paper-05); }

/* 图片面板网格 */
.img-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; flex: 1; min-height: 0; }
.img-col { display: flex; flex-direction: column; gap: 10px; min-height: 0; }
.drop-zone { border: 2px dashed var(--border-color); border-radius: var(--radius-lg); padding: 16px; text-align: center; cursor: pointer; transition: 0.2s; color: var(--text-muted); background: var(--ink-20); flex-shrink: 0; min-height: 70px; display: flex; flex-direction: column; justify-content: center; align-items: center; }
.drop-zone:hover, .drop-zone.dragover { border-color: var(--primary-color); background: rgba(20, 184, 166, 0.05); }
.drop-zone i { font-size: 24px; margin-bottom: 4px; display: block; }
.link { color: var(--primary-color); text-decoration: underline; cursor: pointer; font-size: 13px; }
.preview-area { flex: 1; min-height: 0; background: var(--ink-20); border: 1px solid var(--border-color); border-radius: var(--radius-md); display: flex; align-items: center; justify-content: center; overflow: hidden; position: relative; }
#imgPreview { max-width: 100%; max-height: 100%; object-fit: contain; display: block; }
.placeholder { color: var(--text-muted); font-size: 32px; opacity: 0.3; }

/* 右侧输入输出布局修复 */
.img-col-right { display: flex; flex-direction: column; gap: 10px; flex: 1; min-height: 0; }
.img-col-right .io-header { flex-shrink: 0; }
.img-col-right .io-textarea { flex: 1; min-height: 0; height: auto; }
.img-col-right .sub-actions { flex-shrink: 0; display: flex; flex-direction: column; gap: 6px; }
.img-col-right .sub-label { font-size: 12px; color: var(--text-muted); flex-shrink: 0; }
.img-col-right .sub-actions .io-textarea { height: 50px; flex: none; min-height: 0; margin: 0; }

/* 文件子标签 */
.sub-tabs { margin-bottom: 16px; border: 1px solid var(--border-color); border-radius: var(--radius-sm); overflow: hidden; }
.sub-tab-btn { padding: 8px; font-size: 12px; border-bottom: none; }
.sub-panel { display: none; flex-direction: column; flex: 1; gap: 12px; }
.sub-panel.active { display: flex; }
.file-save-row { display: flex; gap: 12px; align-items: center; }
.file-save-row input { flex: 1; background: var(--ink-20); border: 1px solid var(--border-color); border-radius: var(--radius-md); padding: 8px 12px; color: var(--text-primary); outline: none; }

/* 响应式 */
@media (max-width: 768px) {
    .main-content { height: auto; padding: 80px 10px 60px; overflow-y: auto; }
    .tool-card { height: auto; min-height: 80vh; }
    .img-grid { grid-template-columns: 1fr; }
    .io-textarea { min-height: 120px; }
    .panel { overflow-y: visible; }
}

/* Toast */
.toast { position: fixed; bottom: 40px; left: 50%; transform: translateX(-50%); background: var(--primary-color); color: white; padding: 8px 20px; border-radius: var(--radius-md); font-size: 12px; z-index: 9999; opacity: 0; transition: opacity 0.3s; pointer-events: none; }

/* 底部版权已在 common.css 统一定义 */