/* ============================================================
   mermaid.css — Mermaid 编辑器专属样式
   依赖 common.css 的基础变量与组件。
   ============================================================ */

/* 移动端标签栏 */
.mobile-tabs { display: none; background: var(--surface); border-bottom: 1px solid var(--border); }
.mobile-tab {
    flex: 1; padding: 10px; text-align: center; font-size: 13px; font-weight: 600;
    color: var(--text-muted); cursor: pointer; border-bottom: 2px solid transparent; transition: all 0.2s;
}
.mobile-tab.active { color: var(--accent); border-bottom-color: var(--accent); }

/* ===== 模板下拉选择 ===== */
.template-select-wrapper { position: relative; }
.template-select {
    appearance: none;
    background: var(--surface-2);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 7px 36px 7px 14px;
    border-radius: 8px;
    font-family: inherit;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    outline: none;
}
.template-select:hover { border-color: var(--border-hover); background: var(--surface-3); }
.template-select:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-glow); }
.template-select-arrow {
    position: absolute; right: 12px; top: 50%; transform: translateY(-50%);
    color: var(--text-muted); font-size: 10px; pointer-events: none;
}

/* ===== 编辑器面板 ===== */
.editor-panel { width: 50%; border-right: 1px solid var(--border); }
.editor-body { flex: 1; display: flex; overflow: hidden; position: relative; }

.line-numbers {
    padding: 16px 12px 16px 0;
    text-align: right;
    color: var(--text-muted);
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    line-height: 1.65;
    user-select: none;
    overflow: hidden;
    min-width: 44px;
    background: var(--bg);
    border-right: 1px solid var(--border);
    opacity: 0.6;
}
.line-numbers .active-line { color: var(--accent); font-weight: 600; }

#editor {
    flex: 1;
    padding: 16px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    line-height: 1.65;
    color: var(--text);
    background: var(--bg);
    border: none;
    outline: none;
    resize: none;
    tab-size: 4;
    white-space: pre;
    overflow: auto;
}
#editor::selection { background: rgba(0, 229, 160, 0.18); }
#editor::-webkit-scrollbar { width: 8px; height: 8px; }
#editor::-webkit-scrollbar-track { background: transparent; }
#editor::-webkit-scrollbar-thumb { background: var(--surface-3); border-radius: 4px; }
#editor::-webkit-scrollbar-thumb:hover { background: var(--border-hover); }

/* ===== 预览面板 ===== */
.preview-panel { flex: 1; min-width: 0; }

.preview-body {
    flex: 1;
    overflow: hidden;
    background: var(--bg);
    position: relative;
    background-image:
        radial-gradient(circle at 50% 50%, rgba(0, 229, 160, 0.015) 0%, transparent 70%),
        linear-gradient(var(--grid-color) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid-color) 1px, transparent 1px);
    background-size: 100% 100%, 24px 24px, 24px 24px;
}
.preview-body.grabbing { cursor: grabbing !important; }
.preview-body.can-grab { cursor: grab; }

.preview-content {
    position: absolute;
    top: 0; left: 0;
    padding: 40px;
    transform-origin: 0 0;
    transition: none;
}
.preview-content.smooth-transition { transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1); }
.preview-content svg { display: block; }
.preview-content.fade-in { animation: fadeScaleIn 0.35s cubic-bezier(0.16, 1, 0.3, 1); }

@keyframes fadeScaleIn {
    from { opacity: 0; transform: translate(var(--pan-x, 0px), var(--pan-y, 0px)) scale(0.96); }
    to { opacity: 1; }
}

/* Mermaid 节点描边统一 */
.preview-content .node rect,
.preview-content .node polygon,
.preview-content .node circle { stroke-width: 1.5px; }

/* 预览空状态居中（相对视口） */
.preview-body .empty-state {
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    padding: 40px;
    z-index: 3;
}

/* 错误态 */
.error-state { display: flex; flex-direction: column; gap: 12px; padding: 24px; max-width: 500px; width: 100%; }
.error-header { display: flex; align-items: center; gap: 10px; color: var(--error); font-weight: 600; font-size: 14px; }
.error-message {
    background: var(--error-bg);
    border: 1px solid var(--error-bg);
    border-radius: 8px;
    padding: 14px 16px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    line-height: 1.6;
    color: var(--error);
    max-height: 200px;
    overflow: auto;
    word-break: break-all;
}

/* 坐标指示器 */
.coords-indicator {
    position: absolute;
    top: 10px; right: 14px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    color: var(--text-muted);
    opacity: 0;
    transition: opacity 0.2s;
    pointer-events: none;
    z-index: 5;
    background: var(--surface);
    padding: 3px 8px;
    border-radius: 4px;
}
.coords-indicator.visible { opacity: 0.7; }

/* Toast 在编辑器内偏下 */
#toastContainer { top: 130px; }

/* ===== 全屏预览 ===== */
.preview-panel:fullscreen,
.preview-panel:-webkit-full-screen { background: var(--bg); }
.preview-panel:fullscreen .panel-header,
.preview-panel:-webkit-full-screen .panel-header {
    position: absolute; top: 0; left: 0; right: 0; z-index: 10;
    background: var(--surface); backdrop-filter: blur(12px);
}
.preview-panel:fullscreen .preview-body { padding-top: 42px; }

/* ===== 移动端 ===== */
@media (max-width: 768px) {
    .mobile-tabs { display: flex; }
    .main-area { flex-direction: column; }
    .editor-panel { width: 100% !important; border-right: none; border-bottom: 1px solid var(--border); }
    .divider { display: none; }
    .panel.hidden-mobile { display: none !important; }
    .preview-content { padding: 20px; }
}