/* PDF/幻灯片阅读：纸面占主空间，工具按需展开。 */
:root{--dur-fast:160ms;--dur-base:220ms;--dur-slow:380ms;--dur-drag-return:120ms;--ease-out:cubic-bezier(.22,.61,.21,1);--ease-spring:cubic-bezier(.32,1.25,.38,1)}
.pdf-reader{position:relative;display:flex;flex-direction:column;box-sizing:border-box;width:100%;height:100%;min-width:0;min-height:0;padding:12px 16px 0;background:var(--canvas,#f6f4ef);color:var(--text,#29332e);line-height:1.6}
.pdf-paper{display:flex;flex:1;min-width:0;min-height:0;max-width:100%;width:100%;overflow:auto;overscroll-behavior:contain;border:0;border-radius:4px;background:#e8e7e1}
.pdf-surface{position:relative;flex:none;transform-origin:center;max-width:none;margin:auto;background:#fff;box-shadow:0 1px 3px #0002,0 8px 28px #0002}
.pdf-surface>canvas{display:block;max-width:none;user-select:none;-webkit-user-select:none;-webkit-touch-callout:none}
.pdf-turn{position:absolute;inset:0;pointer-events:none;z-index:1}
.pdf-paper[data-operation=dragging] .pdf-surface{cursor:grabbing}
.pdf-reader>[role=status]{position:absolute;z-index:2;left:50%;top:20px;transform:translateX(-50%);max-width:calc(100% - 48px);padding:5px 12px;margin:0;border:1px solid #0000000d;border-radius:24px;background:var(--surface,#fffefa);color:var(--muted,#626d64);box-shadow:0 2px 10px #00000008;font-size:12px;line-height:1.5;overflow-wrap:anywhere;pointer-events:none}
.pdf-reader>[role=status]:empty{display:none}
.pdf-reader>.pdf-status-quiet{left:0;top:0;width:1px;height:1px;padding:0;margin:-1px;border:0;transform:none;overflow:hidden;clip-path:inset(50%);white-space:nowrap}
.pdf-controls{flex:none;min-width:0;transition:transform var(--dur-fast) var(--ease-out),opacity var(--dur-fast) var(--ease-out)}
.pdf-toolbar{display:grid;grid-template-columns:48px minmax(88px,1fr) 48px 64px 48px;align-items:center;gap:4px;max-width:460px;margin:0 auto;padding:7px max(0px,env(safe-area-inset-right)) calc(7px + env(safe-area-inset-bottom)) max(0px,env(safe-area-inset-left))}
.pdf-toolbar button,.pdf-panel button{font:inherit;min-width:44px;min-height:44px;border:1px solid transparent;border-radius:10px;background:transparent;color:inherit;padding:8px 10px;cursor:pointer;touch-action:manipulation}
.pdf-toolbar button:hover:not(:disabled),.pdf-panel button:hover:not(:disabled){background:var(--surface,#fffefa);border-color:var(--divider,#dfe4dd)}
.pdf-toolbar button:active:not(:disabled),.pdf-panel button:active:not(:disabled){transform:scale(.96)}
.pdf-toolbar button:disabled,.pdf-panel button:disabled{opacity:.35;cursor:default}
.pdf-toolbar .pdf-previous,.pdf-toolbar .pdf-next,.pdf-toolbar .pdf-more{font-size:0;line-height:1}
.pdf-previous::before,.pdf-next::before{font-size:30px;font-weight:400;line-height:24px;display:block}
.pdf-previous::before{content:'‹';transform:translateX(-1px)}.pdf-next::before{content:'›';transform:translateX(1px)}.pdf-more::before{content:'•••';font-size:16px;letter-spacing:2px}
.pdf-page-button{font-variant-numeric:tabular-nums;font-size:14px!important;font-weight:600!important;letter-spacing:.05em;white-space:nowrap}
.pdf-controls-hidden{opacity:0;transform:translateY(8px);pointer-events:none}
.pdf-panel{position:fixed;inset:auto 16px calc(72px + var(--pdf-keyboard-inset,0px));margin:0 auto;width:min(420px,calc(100% - 32px));max-width:calc(100% - 32px);max-height:calc(100dvh - 100px);box-sizing:border-box;padding:0;border:1px solid var(--divider,#dfe4dd);border-radius:18px;background:var(--surface,#fffefa);color:var(--text,#29332e);box-shadow:0 12px 48px #0003;overflow:auto;overscroll-behavior:contain}
.pdf-panel::backdrop{background:#121b2059}
.pdf-panel header{display:flex;position:sticky;top:0;align-items:center;justify-content:space-between;gap:16px;padding:10px 12px 10px 20px;background:var(--surface,#fffefa);border-bottom:1px solid var(--divider,#dfe4dd)}
.pdf-panel h2{font-size:17px;font-weight:650;line-height:1.5;margin:0;outline:none}
.pdf-panel>section{padding:20px}.pdf-panel p{font-size:13px;line-height:1.7;color:var(--muted,#626d64);overflow-wrap:anywhere;margin:14px 0 0}
.pdf-panel form{display:flex;gap:12px;align-items:flex-end;margin:0}.pdf-panel label{display:grid;gap:8px;flex:1;font-size:13px;color:var(--muted,#626d64)}
.pdf-panel input{box-sizing:border-box;display:block;width:100%;min-width:0;min-height:48px;font:inherit;font-size:18px!important;padding:9px 12px;border:1px solid var(--divider,#dfe4dd);border-radius:10px;background:var(--canvas,#f6f4ef);color:var(--text,#29332e);font-variant-numeric:tabular-nums}
.pdf-panel form>button{min-height:48px;background:var(--accent,#2b6b55);color:var(--surface,#fffefa);padding-inline:20px}
.pdf-fit-options{display:grid;grid-template-columns:repeat(3,1fr);gap:4px;padding:4px;border-radius:13px;background:var(--canvas,#f6f4ef)}
.pdf-fit-options button[aria-pressed=true]{background:var(--surface,#fffefa);border-color:var(--divider,#dfe4dd);box-shadow:0 1px 3px #0000000d;font-weight:650}
.pdf-zoom-options{display:grid;grid-template-columns:1fr 1fr 1fr;align-items:center;gap:8px;padding-top:16px}.pdf-zoom-options output{text-align:center;font-variant-numeric:tabular-nums;font-weight:600}
.pdf-zoom-options button{border-color:var(--divider,#dfe4dd)}.pdf-reader summary{min-height:44px;cursor:pointer;line-height:1.6;padding:8px 0;font-weight:600}
.pdf-text{white-space:pre-wrap;overflow-wrap:anywhere;font:inherit;font-size:16px;line-height:1.8;max-width:100%;max-height:45dvh;overflow:auto}
.pdf-reader :focus-visible{outline:3px solid var(--accent,#2b6b55);outline-offset:2px}
.pdf-input-active .pdf-toolbar{visibility:hidden}
.pdf-panel .pdf-landscape-entry{display:block;width:100%;margin-top:18px;border-color:var(--divider,#dfe4dd);background:var(--accent,#2b6b55);color:var(--surface,#fffefa);font-weight:600}
.pdf-panel .pdf-space-help{margin-top:8px;background:var(--surface,#fffefa);color:var(--accent,#2b6b55)}
body.pdf-presentation-open{overflow:hidden}
.reader.reader-presentation>.reader-bar,.reader.reader-presentation>.reader-controls-restore{display:none!important}
.pdf-reader.pdf-immersive,.visitor-pdf-preview.pdf-reader.pdf-immersive{position:fixed;inset:0;z-index:100;box-sizing:border-box;width:100%;height:100vh;height:100dvh;padding:env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);background:#171b19;isolation:isolate}
.pdf-immersive .pdf-paper{border-radius:0;background:transparent;overscroll-behavior:none}
.pdf-immersive .pdf-controls{position:absolute;z-index:4;left:50%;bottom:max(8px,env(safe-area-inset-bottom));width:min(460px,calc(100% - 32px - env(safe-area-inset-left) - env(safe-area-inset-right)));border:1px solid #ffffff24;border-radius:16px;transform:translateX(-50%);background:var(--surface,#fffefa);box-shadow:0 4px 28px #0004}
.pdf-immersive .pdf-controls-hidden{transform:translate(-50%,8px)}
.pdf-immersive .pdf-toolbar{padding:4px 6px}
.pdf-reader .pdf-presentation-exit,.pdf-reader .pdf-presentation-tools{position:absolute;z-index:5;left:max(10px,env(safe-area-inset-left));top:max(8px,env(safe-area-inset-top));min-width:60px;min-height:44px;padding:8px 14px;border:1px solid #ffffff36;border-radius:12px;background:#1b211de8;color:#fff;font:inherit;font-size:14px;line-height:1.4;cursor:pointer;touch-action:manipulation}
.pdf-reader .pdf-presentation-tools{left:auto;right:max(10px,env(safe-area-inset-right))}
.pdf-presentation-exit[hidden],.pdf-presentation-tools[hidden],.pdf-presentation-hint[hidden]{display:none}
.pdf-presentation-hint{position:absolute;z-index:3;top:calc(max(8px,env(safe-area-inset-top)) + 50px);left:50%;width:max-content;max-width:calc(100% - 48px);transform:translateX(-50%);padding:8px 14px;margin:0;border-radius:12px;background:#1b211de8;color:#fff;font-size:13px;line-height:1.6;text-align:center;pointer-events:none}
@media(max-width:600px){.pdf-reader{padding:8px max(8px,env(safe-area-inset-right)) 0 max(8px,env(safe-area-inset-left))}.pdf-toolbar{padding-inline:0;grid-template-columns:44px minmax(72px,1fr) 44px 60px 44px;gap:2px}.pdf-reader>[role=status]{top:16px;max-width:calc(100% - 36px)}.pdf-panel{inset:auto 0 var(--pdf-keyboard-inset,0px);width:100%;max-width:100%;border-radius:20px 20px 0 0;padding-bottom:env(safe-area-inset-bottom)}.pdf-panel>section{padding:18px 20px 24px}}
@media(max-height:480px){.pdf-reader{padding-top:4px}.pdf-toolbar{padding-top:3px;padding-bottom:calc(3px + env(safe-area-inset-bottom))}.pdf-reader>[role=status]{top:10px;padding:3px 10px}.pdf-panel{bottom:var(--pdf-keyboard-inset,0px);max-height:calc(100dvh - 12px)}}
@media(hover:none){.pdf-toolbar button:hover:not(:disabled),.pdf-panel button:hover:not(:disabled){background:transparent;border-color:transparent}.pdf-fit-options button[aria-pressed=true]:hover{background:var(--surface,#fffefa);border-color:var(--divider,#dfe4dd)}}
@media(prefers-color-scheme:dark){.pdf-paper{background:#222823}}
@media(prefers-reduced-motion:reduce){.pdf-controls,.pdf-surface,.pdf-toolbar button,.pdf-panel button{transition:none!important}}

.office-preview{width:min(100% - 32px,440px);margin:clamp(24px,12dvh,100px) auto;padding:28px 24px;border:1px solid var(--divider,var(--line));border-radius:18px;background:var(--surface);text-align:center}
.office-format{display:block;font-size:10px;font-weight:650;letter-spacing:.16em;color:var(--muted)}
.office-indicator{display:grid;place-items:center;width:48px;height:48px;margin:20px auto;border-radius:50%;background:var(--accent-soft,#edf1e9);color:var(--accent);font-size:27px}
.office-title{margin:0;font-size:19px;line-height:1.4;font-weight:600}.office-detail{margin:10px auto 0;font-size:14px;line-height:1.7;color:var(--muted);max-width:28ch}
.office-actions:empty{display:none}.office-actions{margin-top:22px}.office-retry{min-height:44px;padding:10px 20px;border:1px solid var(--divider,var(--line));border-radius:10px;background:var(--surface);color:var(--accent);font:inherit;cursor:pointer}.office-retry:disabled{opacity:.6;cursor:wait}
@media(max-height:460px){.office-preview{margin:16px auto;padding:18px}.office-indicator{margin:10px auto}.office-title{font-size:17px}}

.visitor-pdf-preview.pdf-reader{height:max(280px,72dvh);min-width:0}

/* A quiet first-view cue preserves the whole-slide overview on a portrait phone. */
.pdf-reading-tip{display:flex;align-items:center;gap:6px;width:100%;max-width:460px;margin:8px auto 0;padding:2px 6px 2px 12px;border:1px solid var(--divider,#dfe4dd);border-radius:10px;background:var(--surface,#fffefa);color:var(--muted,#626d64);font-size:12px;line-height:1.6}.pdf-reading-tip[hidden]{display:none}.pdf-reading-tip>span{flex:1}.pdf-reading-tip>button{flex:none;min-width:44px;min-height:44px;padding:6px;background:transparent;border:0;color:var(--text,#29332e);font:inherit;cursor:pointer}.pdf-reading-tip>button:last-child{font-size:21px}.pdf-reading-tip>button:focus-visible{outline:2px solid var(--accent,#2b6b55);outline-offset:1px}