/* public/assets/css/tools/image/base64.css */
.b64-wrapper { background: var(--bg-surface); border-radius: 24px; padding: 24px; border: 1px solid var(--border-color); box-shadow: 0 10px 25px -5px rgba(0,0,0,0.05); }
.b64-header { font-size: 1.6rem; font-weight: 800; color: var(--text-main); margin-bottom: 8px; text-align: center; }
.b64-subtitle { color: var(--text-muted); font-size: 0.95rem; padding-bottom: 20px; margin-bottom: 24px; text-align: center; max-width: 800px; margin: 0 auto 24px; }

/* 标签页导航 */
.b64-tabs { display: flex; justify-content: center; gap: 10px; margin-bottom: 24px; border-bottom: 2px solid var(--border-color); padding-bottom: 16px; }
.b64-tab-btn { background: var(--bg-body); border: 1px solid var(--border-color); padding: 10px 24px; border-radius: 12px; font-weight: 700; color: var(--text-muted); cursor: pointer; transition: 0.2s; font-size: 1rem; }
.b64-tab-btn:hover { border-color: var(--primary-color); color: var(--primary-color); }
.b64-tab-btn.active { background: var(--primary-color); color: #fff; border-color: var(--primary-color); box-shadow: 0 4px 12px rgba(0,102,204,0.2); }

/* 容器面板 */
.b64-panel { display: none; flex-direction: column; gap: 20px; animation: b64FadeIn 0.3s ease; }
.b64-panel.active { display: flex; }
@keyframes b64FadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

.b64-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; align-items: stretch; }
@media (max-width: 900px) { .b64-grid { grid-template-columns: 1fr; } }

.b64-card { background: var(--bg-body); border: 1px solid var(--border-color); border-radius: 16px; padding: 20px; display: flex; flex-direction: column; gap: 16px; }
.b64-card-title { font-size: 1.05rem; font-weight: 700; color: var(--text-main); margin: 0; padding-bottom: 12px; border-bottom: 1px solid var(--border-color); display: flex; justify-content: space-between; align-items: center; }

/* 拖拽上传区 */
.b64-upload-box { flex: 1; border: 2px dashed var(--primary-color); border-radius: 12px; padding: 40px 20px; text-align: center; cursor: pointer; background: rgba(0, 102, 204, 0.03); transition: 0.2s; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 10px; color: var(--primary-color); font-weight: 600; min-height: 200px; }
.b64-upload-box:hover, .b64-upload-box.dragover { background: rgba(0, 102, 204, 0.1); transform: scale(1.02); }
.b64-file-input { display: none; }

/* 预览区 (带透明网格背景) */
.b64-preview-box { flex: 1; background-color: #e2e8f0; background-image: linear-gradient(45deg, #ccc 25%, transparent 25%), linear-gradient(-45deg, #ccc 25%, transparent 25%), linear-gradient(45deg, transparent 75%, #ccc 75%), linear-gradient(-45deg, transparent 75%, #ccc 75%); background-size: 20px 20px; background-position: 0 0, 0 10px, 10px -10px, -10px 0px; border-radius: 12px; display: flex; justify-content: center; align-items: center; padding: 20px; min-height: 200px; overflow: hidden; border: 1px solid var(--border-color); }
.b64-preview-img { max-width: 100%; max-height: 300px; object-fit: contain; box-shadow: 0 4px 12px rgba(0,0,0,0.15); border-radius: 4px; display: none; }

/* 文本域 */
.b64-textarea { width: 100%; flex: 1; padding: 16px; border-radius: 12px; border: 1px solid var(--border-color); background: var(--bg-surface); color: var(--text-main); font-family: monospace; font-size: 0.85rem; outline: none; transition: 0.2s; resize: vertical; min-height: 250px; line-height: 1.5; word-break: break-all; box-sizing: border-box; }
.b64-textarea:focus { border-color: var(--primary-color); box-shadow: 0 0 0 3px rgba(0,102,204,0.1); }

/* 按钮组 */
.b64-btn-group { display: flex; gap: 10px; flex-wrap: wrap; }
.b64-btn { flex: 1; background: var(--primary-color); color: #fff; border: none; padding: 10px 16px; border-radius: 8px; font-weight: 700; cursor: pointer; transition: 0.2s; white-space: nowrap; font-size: 0.9rem; }
.b64-btn:hover { background: var(--primary-hover); transform: translateY(-2px); box-shadow: 0 4px 12px rgba(0,102,204,0.2); }
.b64-btn-sec { background: var(--bg-surface); color: var(--text-main); border: 1px solid var(--border-color); }
.b64-btn-sec:hover { border-color: var(--primary-color); color: var(--primary-color); }

/* 暗黑模式 */
[data-theme="dark"] .b64-wrapper, [data-theme="dark"] .b64-tab-btn { background: #1e293b; border-color: #334155; }
[data-theme="dark"] .b64-card { background: #0f172a; border-color: #475569; }
[data-theme="dark"] .b64-card-title, [data-theme="dark"] .b64-tabs { border-color: #475569; }
[data-theme="dark"] .b64-textarea { background: #020617; border-color: #475569; color: #a5b4fc; }
[data-theme="dark"] .b64-btn-sec { background: #1e293b; border-color: #475569; color: #f8fafc; }