/* ========================================
   二维码工具样式
   ======================================== */

/* 主内容 */
.main-content { width: 100%; max-width: 800px; 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-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); }

/* 选项栏 */
.options-bar { display: flex; gap: 16px; align-items: center; flex-wrap: wrap; }
.opt-item { display: flex; align-items: center; gap: 6px; font-size: 13px; color: var(--text-secondary); }
.opt-item select { background: var(--ink-30); border: 1px solid var(--border-color); color: var(--text-primary); padding: 4px 8px; border-radius: var(--radius-sm); outline: none; }

/* 预览区 */
.preview-area { 
    flex: 1; 
    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; 
    min-height: 150px; 
}
#qrImage { max-width: 100%; max-height: 100%; object-fit: contain; }
#qrCanvas { display: none; } /* 用于下载 */
.placeholder { color: var(--text-muted); font-size: 32px; opacity: 0.3; text-align: center; }
.placeholder p { font-size: 13px; margin-top: 8px; }

/* 拖拽上传 */
.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; }
#decodePreview { max-width: 100%; max-height: 200px; object-fit: contain; }

/* 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; }
    .panel { overflow-y: visible; }
}