body.airjournal-article {
    /* Keep native document scrolling, but do not let touch gestures pull the
       viewport beyond the real beginning or end of an article. */
    overscroll-behavior-y: none;
}

/* Mermaid appends an empty, absolutely positioned tooltip to <body>. Its
   padding and border otherwise create real scrollable space after the footer. */
.mermaidTooltip:empty {
    display: none !important;
}

.article-mermaid {
    position: relative;
    width: 100%;
    max-width: 100%;
    margin: 28px 0;
    padding: 22px;
    overflow: hidden;
    border: 1px solid #e2e8f0;
    border-radius: 16px;
    background: #ffffff;
    box-shadow: 0 12px 34px rgba(15, 23, 42, 0.07);
}

.article-mermaid-stage {
    width: 100%;
    max-width: 100%;
    overflow-x: auto;
    overflow-y: hidden;
    color: #64748b;
    text-align: center;
    scrollbar-width: thin;
    scrollbar-color: #cbd5e1 transparent;
    -webkit-overflow-scrolling: touch;
}

.article-mermaid:not(.is-loading):not(.is-error) .article-mermaid-stage {
    cursor: zoom-in;
}

.article-mermaid:not(.is-loading):not(.is-error) .article-mermaid-stage:focus-visible {
    border-radius: 10px;
    outline: none;
    box-shadow: inset 0 0 0 2px rgba(37, 99, 235, 0.5);
}

.article-mermaid-stage svg {
    display: block;
    width: auto;
    min-width: min-content;
    height: auto;
    margin: 0 auto;
}

.article-mermaid.is-loading .article-mermaid-stage {
    min-height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* mermaid 还在下载（html.mermaid-pending，article-mermaid.js 加）：正文里的源码块先显示成同一张骨架，高度不变（不跳），
   源码只是看不见；下载失败会撤掉这个类，源码照常显示 */
html.mermaid-pending #article-content > pre:has(> code[class*="mermaid"]) {
    position: relative;
    min-height: 150px;
    overflow: hidden;
    border: 1px solid rgba(148, 163, 184, .25);
    border-radius: 16px;
    background: url("data:image/svg+xml,%3Csvg xmlns=%22http://www.w3.org/2000/svg%22 viewBox=%220 0 320 96%22%3E%3Cg fill=%22rgba(148,163,184,.30)%22%3E%3Crect x=%220%22 y=%2230%22 width=%2272%22 height=%2236%22 rx=%2210%22/%3E%3Crect x=%22124%22 y=%2230%22 width=%2272%22 height=%2236%22 rx=%2210%22/%3E%3Crect x=%22248%22 y=%226%22 width=%2272%22 height=%2230%22 rx=%229%22/%3E%3Crect x=%22248%22 y=%2260%22 width=%2272%22 height=%2230%22 rx=%229%22/%3E%3C/g%3E%3Cg stroke=%22rgba(148,163,184,.42)%22 stroke-width=%223%22 fill=%22none%22 stroke-linecap=%22round%22%3E%3Cpath d=%22M76 48h44%22/%3E%3Cpath d=%22M200 48c20 0 22-27 44-27%22/%3E%3Cpath d=%22M200 48c20 0 22 27 44 27%22/%3E%3C/g%3E%3C/svg%3E") center / min(78%, 320px) auto no-repeat, transparent !important;
}

html.mermaid-pending #article-content > pre:has(> code[class*="mermaid"]) > code {
    visibility: hidden;
}

html.mermaid-pending #article-content > pre:has(> code[class*="mermaid"])::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(100deg, transparent 30%, rgba(255, 255, 255, .45) 50%, transparent 70%) -150% 0 / 60% 100% no-repeat;
    animation: article-mermaid-shimmer 1.4s ease-in-out infinite;
    pointer-events: none;
}

:root[data-blog-theme="dark"].mermaid-pending #article-content > pre:has(> code[class*="mermaid"])::after {
    background-image: linear-gradient(100deg, transparent 30%, rgba(255, 255, 255, .08) 50%, transparent 70%);
}

@media (prefers-reduced-motion: reduce) {
    html.mermaid-pending #article-content > pre:has(> code[class*="mermaid"])::after {
        animation: none;
    }
}

/* 等待出图（排队中或渲染中，舞台里还没有 svg）：画一张示意流程图的骨架，上面扫过一道光，
   「图表加载中…」缩成底部的小字（10-08，以前只有一行字，像卡住了）。灰用半透明，深浅两色底都看得见 */
.article-mermaid:not(.is-error) .article-mermaid-stage:not(:has(svg)) {
    position: relative;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    min-height: 150px;
    padding-bottom: 2px;
    font-size: 12px;
    color: #94a3b8;
    background: url("data:image/svg+xml,%3Csvg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 96"%3E%3Cg fill="rgba%28148,163,184,.30%29"%3E%3Crect x="0" y="30" width="72" height="36" rx="10"/%3E%3Crect x="124" y="30" width="72" height="36" rx="10"/%3E%3Crect x="248" y="6" width="72" height="30" rx="9"/%3E%3Crect x="248" y="60" width="72" height="30" rx="9"/%3E%3C/g%3E%3Cg stroke="rgba%28148,163,184,.42%29" stroke-width="3" fill="none" stroke-linecap="round"%3E%3Cpath d="M76 48h44"/%3E%3Cpath d="M200 48c20 0 22-27 44-27"/%3E%3Cpath d="M200 48c20 0 22 27 44 27"/%3E%3C/g%3E%3C/svg%3E") center 18px / min(78%, 320px) auto no-repeat;
}

.article-mermaid:not(.is-error) .article-mermaid-stage:not(:has(svg))::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(100deg, transparent 30%, rgba(255, 255, 255, .45) 50%, transparent 70%) -150% 0 / 60% 100% no-repeat;
    animation: article-mermaid-shimmer 1.4s ease-in-out infinite;
    pointer-events: none;
}

:root[data-blog-theme="dark"] .article-mermaid:not(.is-error) .article-mermaid-stage:not(:has(svg))::after {
    background-image: linear-gradient(100deg, transparent 30%, rgba(255, 255, 255, .08) 50%, transparent 70%);
}

@keyframes article-mermaid-shimmer {
    to { background-position: 250% 0; }
}

@media (prefers-reduced-motion: reduce) {
    .article-mermaid:not(.is-error) .article-mermaid-stage:not(:has(svg))::after {
        animation: none;
    }
}

.article-mermaid.is-error {
    border-color: #fecaca;
    background: #fff7f7;
}

.article-mermaid.is-error .article-mermaid-stage {
    margin-bottom: 12px;
    color: #b91c1c;
}

.article-mermaid.is-error pre {
    margin: 0 !important;
    text-align: left;
}

:root[data-blog-theme="dark"] .article-mermaid {
    border-color: rgba(148, 163, 184, 0.18);
    background: #2c333e;
    box-shadow: 0 14px 38px rgba(14, 18, 24, 0.24);
}

:root[data-blog-theme="dark"] .article-mermaid-stage {
    color: #94a3b8;
    scrollbar-color: #475569 transparent;
}

body.article-mermaid-viewer-open {
    overflow: hidden !important;
}

.article-mermaid-viewer[hidden] {
    display: none !important;
}

.article-mermaid-viewer {
    position: fixed;
    inset: 0;
    z-index: 2147483200;
    display: block;
    overflow: hidden;
    color: #e2e8f0;
    background: rgba(15, 23, 42, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.article-mermaid-viewer-title,
.article-mermaid-viewer-description {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.article-mermaid-viewer-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex: 0 0 auto;
    width: 36px;
    height: 36px;
    padding: 0;
    border: 0;
    border-radius: 10px;
    color: #e2e8f0;
    background: transparent;
    cursor: pointer;
    transition: color 160ms ease, background-color 160ms ease, transform 160ms ease;
}

.article-mermaid-viewer-button:focus-visible {
    color: #eff6ff;
    background: rgba(59, 130, 246, 0.34);
    outline: 2px solid rgba(147, 197, 253, 0.72);
    outline-offset: 1px;
}

@media (hover: hover) and (pointer: fine) {


.article-mermaid-viewer-button:active {
    transform: scale(0.95);
}


}

.article-mermaid-viewer-close {
    position: absolute;
    top: 26px;
    right: 26px;
    z-index: 3;
    width: 44px;
    height: 44px;
    border: 1px solid rgba(255, 255, 255, 0.26);
    border-radius: 50%;
    color: #f8fafc;
    background: rgba(15, 23, 42, 0.88);
    box-shadow: 0 10px 26px rgba(2, 6, 23, 0.34);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.article-mermaid-viewer-close:focus-visible {
    color: #f8fafc;
    background: rgba(15, 23, 42, 0.88);
    outline: 2px solid rgba(255, 255, 255, 0.82);
    outline-offset: 2px;
    box-shadow: 0 10px 26px rgba(2, 6, 23, 0.34);
}

.article-mermaid-viewer-viewport {
    position: absolute;
    top: 18px;
    right: 18px;
    bottom: 18px;
    left: 18px;
    overflow: hidden;
    border: 1px solid rgba(226, 232, 240, 0.2);
    border-radius: 16px;
    background: #f8fafc;
    cursor: grab;
    touch-action: none;
    user-select: none;
    -webkit-user-select: none;
}

.article-mermaid-viewer-viewport.is-dragging {
    cursor: grabbing;
}

.article-mermaid-viewer-canvas {
    position: absolute;
    top: 50%;
    left: 50%;
    transform-origin: center center;
    will-change: transform;
}

.article-mermaid-viewer-canvas svg {
    display: block;
    max-width: none !important;
    overflow: visible;
    pointer-events: none;
}

:root[data-blog-theme="dark"] .article-mermaid-viewer {
    background: rgba(24, 30, 38, 0.96);
}

:root[data-blog-theme="dark"] .article-mermaid-viewer-viewport {
    border-color: rgba(148, 163, 184, 0.2);
    background: #2c333e;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

:root[data-blog-theme="dark"] .article-mermaid.is-error {
    border-color: #7f1d1d;
    background: #24191f;
}

:root[data-blog-theme="dark"] .article-mermaid.is-error .article-mermaid-stage {
    color: #fca5a5;
}

@media (max-width: 768px) {
    .article-mermaid {
        margin: 22px 0;
        padding: 14px 10px;
        border-radius: 12px;
    }

    .article-mermaid-stage {
        text-align: left;
    }

    .article-mermaid-stage svg {
        margin: 0;
    }

    .article-mermaid-viewer-close {
        top: 16px;
        right: 16px;
        width: 44px;
        height: 44px;
    }

    .article-mermaid-viewer-viewport {
        top: 8px;
        right: 8px;
        bottom: 8px;
        left: 8px;
        border-radius: 12px;
    }
}

@media (prefers-reduced-motion: reduce) {
    .article-mermaid,
    .article-mermaid *,
    .article-mermaid-viewer,
    .article-mermaid-viewer * {
        scroll-behavior: auto !important;
        animation: none !important;
        transition: none !important;
    }
}

@media (prefers-reduced-transparency: reduce) {
    .article-mermaid-viewer {
        background: #0f172a;
        backdrop-filter: none;
        -webkit-backdrop-filter: none;
    }

    .article-mermaid-viewer-close {
        background: #1e293b;
    }

    :root[data-blog-theme="dark"] .article-mermaid-viewer-viewport {
        background: #2c333e;
    }
}