:root {
    color-scheme: light;
    --ink: #173953;
    --muted: #466179;
    --blue: #0059ab;
    --line: #d5e4ee;
    font: 15px/1.5 "Microsoft YaHei", "PingFang SC", system-ui, sans-serif;
    color: var(--ink);
    background: #f3f8fc;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
body { margin: 0; }
button, input { font: inherit; }
button { cursor: pointer; }
button:disabled { opacity: .54; cursor: default; }
button:focus-visible, a:focus-visible, input:focus-visible { outline: 2px solid #0059ab; outline-offset: 3px; }

.viewer {
    display: flex;
    flex-direction: column;
    height: 100vh;
    height: 100dvh;
    min-height: 340px;
    overflow: hidden;
}

.viewer-toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 16px;
    justify-content: space-between;
    align-items: center;
    padding: 11px 16px;
    border-bottom: 1px solid var(--line);
    background: #fff;
}

.viewer-views, .viewer-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 4px; }
.viewer-views { background: #edf4f9; padding: 3px; border-radius: 8px; }
.viewer-toolbar button, .viewer-help button, .viewer-fallback button {
    min-height: 36px;
    padding: 5px 12px;
    color: var(--ink);
    border: 1px solid transparent;
    border-radius: 6px;
    background: transparent;
    white-space: nowrap;
}

.viewer-toolbar button[aria-pressed="true"], .viewer-help button[aria-pressed="true"] {
    color: #fff;
    background: var(--blue);
}

.viewer-actions button, .viewer-help button, .viewer-fallback button { border-color: var(--line); }
.viewer-toolbar button:not([aria-pressed="true"]):enabled:hover, .viewer-help button:not([aria-pressed="true"]):enabled:hover, .viewer-fallback button:hover { background: #e9f2f9; }
.viewer-stage {
    position: relative;
    isolation: isolate;
    flex: 1 1 auto;
    min-height: 0;
    overflow: hidden;
    background: radial-gradient(ellipse at 50% 42%, #fff 12%, #f3f8fc 50%, #e7f0f7 100%);
}

.viewer-stage canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; cursor: grab; }
.viewer-stage canvas:active { cursor: grabbing; }
.viewer-stage canvas:focus-visible { outline: 2px solid #0059ab; outline-offset: -3px; }
.viewer-zoom { position: absolute; right: 12px; bottom: 12px; z-index: 1; display: flex; gap: 5px; }
.viewer-zoom button {
    width: 38px;
    height: 38px;
    padding: 0;
    border: 1px solid var(--line);
    border-radius: 6px;
    background: #fff;
    color: var(--blue);
    font-size: 22px;
    line-height: 1;
}
.viewer-zoom button:enabled:hover { background: #e9f2f9; }

.viewer-loading, .viewer-fallback, .viewer-noscript {
    position: absolute;
    inset: 0;
    z-index: 2;
    margin: 0;
    display: grid;
    place-content: center;
    justify-items: center;
    gap: 10px;
    padding: 14px;
    text-align: center;
    background: #f3f8fc;
}

.viewer-fallback img { width: min(260px, 55vw); height: min(190px, 34vh); object-fit: contain; }
.viewer-fallback p { margin: 0; }
.viewer-fallback > div { display: flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: 8px 12px; }
.viewer-fallback a, .viewer-noscript a { color: var(--blue); }
.viewer-footer { padding: 9px 16px; border-top: 1px solid var(--line); background: #fff; }
.viewer-help { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 6px 12px; }
.viewer-help p { margin: 0; font-size: 13px; color: var(--muted); }
.viewer-help button { min-height: 31px; font-size: 13px; }
.viewer-range { display: flex; align-items: center; gap: 10px; margin-top: 7px; color: var(--muted); font-size: 13px; }
.viewer-range input { flex: 1; min-width: 0; max-width: 320px; accent-color: var(--blue); }
.viewer-range output { min-width: 4ch; font-variant-numeric: tabular-nums; text-align: right; }

@media (max-width: 460px) {
    .viewer-toolbar, .viewer-footer { padding-inline: 9px; }
    .viewer-toolbar { gap: 5px 8px; }
    .viewer-toolbar button { min-height: 34px; padding-inline: 8px; font-size: 13px; }
    .viewer-help p { font-size: 12px; }
    .viewer-zoom { right: 8px; bottom: 8px; }
    .viewer-zoom button { width: 35px; height: 35px; }
}