:root{color-scheme:light;--ink:#1a2230;--blue:#1e4fa8;--muted:#626e80;--line:#dce1e9;--paper:#fff;--background:#f3f5f8}
*{box-sizing:border-box}body{margin:0;color:var(--ink);background:var(--background);font-family:"Source Han Sans SC","Microsoft YaHei",sans-serif}button,a{-webkit-tap-highlight-color:transparent}button{font:inherit;cursor:pointer}a{color:var(--blue);text-decoration:none}button:focus-visible,a:focus-visible{outline:3px solid #729be7;outline-offset:4px}button{border:0;background:transparent;color:inherit;min-height:44px;padding:0 13px;border-radius:5px}button:hover{background:#e9eef7}button:disabled{opacity:.3;cursor:default}button:disabled:hover{background:transparent}
.site-header{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:24px 36px 22px;background:var(--paper);border-bottom:1px solid var(--line)}.eyebrow{font-size:12px;letter-spacing:.1em;color:var(--blue);margin:0 0 9px}.eyebrow span{color:var(--muted);letter-spacing:.03em;margin-left:16px}h1{font-family:"Source Han Serif SC","Songti SC",SimSun,serif;font-size:25px;font-weight:700;letter-spacing:.01em;margin:0;line-height:1.3}.header-actions{display:flex;align-items:center;gap:7px;font-size:14px;flex-shrink:0}.header-actions .download{display:flex;align-items:center;gap:22px;background:var(--blue);color:white;padding:13px 19px;border-radius:5px;margin-left:9px;min-height:44px}.download:hover{background:#183f86}.download span{font-size:19px;line-height:1}
main{max-width:1600px;margin:0 auto;padding:22px 36px 0}.viewer{border:1px solid var(--line);background:white;box-shadow:0 6px 28px #17294708;display:flex;flex-direction:column}.slide-stage{display:flex;justify-content:center;align-items:center;width:100%;height:calc(100dvh - 243px);min-height:240px;max-height:calc(84vw * .5625);background:#fff;touch-action:pan-y;overflow:hidden}.slide-stage img{display:block;width:100%;height:100%;object-fit:contain;user-select:none}.playbar{display:flex;align-items:center;gap:20px;justify-content:space-between;min-height:62px;border-top:1px solid var(--line);padding:7px 14px;background:#fff}.navigation,.viewer-actions{display:flex;align-items:center;gap:6px;flex-shrink:0}.page-count{font-family:Consolas,"Liberation Mono",monospace;font-size:17px;min-width:76px;text-align:center}.page-count span{color:#8d97a6}.icon-button{width:44px;padding:10px;display:flex;align-items:center;justify-content:center}.icon-button svg,.fullscreen-button svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}.fullscreen-button{display:flex;align-items:center;gap:9px}.slide-caption{color:var(--muted);font-size:14px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;flex:1;min-width:0}.viewer-actions{font-size:14px}.page-foot{display:flex;align-items:center;justify-content:space-between;color:var(--muted);font-size:12px;padding:15px 0 18px}.page-foot p{margin:0}.page-foot span{margin-left:18px;color:#9098a6}.touch-hint{display:none}.noscript{padding:16px 36px}
.viewer:fullscreen{border:0;width:100vw;height:100dvh;max-width:none;background:#111927;box-shadow:none}.viewer:fullscreen .slide-stage{height:100%;max-height:none;min-height:0;background:#111927}.viewer:fullscreen .playbar{position:absolute;bottom:18px;left:50%;transform:translateX(-50%);width:min(760px,calc(100% - 32px));border:1px solid #dce1e9;border-radius:8px;box-shadow:0 6px 30px #0002;opacity:0;transition:opacity .15s}.viewer:fullscreen:hover .playbar,.viewer:fullscreen:focus-within .playbar{opacity:1}
dialog{padding:0;border:1px solid var(--line);border-radius:10px;background:#fff;color:var(--ink);width:min(760px,calc(100vw - 32px));max-height:88dvh;box-shadow:0 24px 90px #07172c33;overscroll-behavior:contain}dialog::backdrop{background:#15223885;backdrop-filter:blur(4px)}.dialog-heading{display:flex;justify-content:space-between;align-items:flex-start;gap:20px;padding:28px 30px 23px;border-bottom:1px solid var(--line);position:sticky;top:0;background:#fff;z-index:1}.dialog-heading h2{font-size:24px;margin:0;line-height:1.4}.dialog-heading .eyebrow{font-size:10px;margin-bottom:7px}.close-button{font-family:Georgia,serif;font-size:30px;width:44px;margin:-5px -8px 0 0;padding:0;flex-shrink:0}.notes-text{white-space:pre-wrap;font-family:"Source Han Serif SC","Songti SC",SimSun,serif;font-size:18px;line-height:1.95;padding:25px 30px 30px}.dialog-footer{border-top:1px solid var(--line);padding:19px 30px;font-size:14px}.overview-dialog{width:min(1080px,calc(100vw - 32px))}.slide-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:19px;padding:25px 30px 30px}.slide-tile{padding:0;text-align:left;border:1px solid var(--line);border-radius:5px;overflow:hidden;background:#fff;min-height:0}.slide-tile:hover{border-color:#7f9dd1}.slide-tile[aria-current=true]{border:2px solid var(--blue)}.slide-tile img{width:100%;height:auto;display:block;border-bottom:1px solid var(--line)}.slide-tile span{display:block;padding:11px 12px;font-size:12px;line-height:1.5;min-height:42px}.resource-row{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:22px 30px;border-bottom:1px solid var(--line)}.resource-row:last-child{border:0}.resource-row h3{font-size:17px;font-weight:600;margin:0 0 6px}.resource-row p{margin:0;color:var(--muted);font-size:13px;line-height:1.6}.resource-row>div:last-child{display:flex;gap:18px;flex-shrink:0;font-size:14px}.resource-row a{padding:8px 0;min-height:40px;display:inline-flex;align-items:center}
@media(min-width:1700px){.slide-stage{max-height:760px}.site-header{padding-left:max(36px,calc((100vw - 1528px)/2));padding-right:max(36px,calc((100vw - 1528px)/2))}}
@media(max-width:900px){.site-header{padding:18px 20px;gap:15px;align-items:flex-start;flex-direction:column}h1{font-size:23px}.header-actions{width:100%;justify-content:flex-start}.header-actions button:first-child{padding-left:0}.header-actions .download{margin-left:auto}main{padding:16px 20px 0}.slide-stage{height:auto;aspect-ratio:16/9;min-height:0;max-height:none}.slide-caption{display:none}.playbar{padding:7px 9px}.page-foot>p:first-child span{display:none}.slide-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.viewer:fullscreen .slide-stage{height:100%;aspect-ratio:auto}.viewer:fullscreen .playbar{opacity:.95}.keyboard-hint{display:none}.touch-hint{display:block}}
@media(max-width:520px){h1{font-size:20px}.eyebrow{font-size:10px}.eyebrow span{margin-left:9px}.site-header{padding:17px 15px 12px}.header-actions{font-size:13px;gap:2px}.header-actions .download{padding:11px 13px;gap:12px}main{padding:12px 10px 0}.playbar{min-height:58px;gap:0}.navigation{gap:0}.viewer-actions{gap:0;font-size:13px}.icon-button{width:38px;min-height:44px}.page-count{min-width:62px;font-size:16px}.fullscreen-button{padding:0 9px;gap:6px}.viewer-actions button:first-child{padding:0 9px}.page-foot{font-size:10px;padding:12px 3px}.dialog-heading{padding:22px 20px 18px}.dialog-heading h2{font-size:21px}.notes-text{padding:20px;font-size:17px}.dialog-footer{padding:17px 20px}.slide-grid{padding:20px;gap:12px}.resource-row{padding:19px 20px;gap:12px;align-items:flex-start;flex-direction:column}.resource-row>div:last-child{gap:23px}.resource-row h3{font-size:16px}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
@media print{body{background:white}.site-header,.playbar,.page-foot,dialog{display:none}main{padding:0;max-width:none}.viewer{border:0;box-shadow:none}.slide-stage{height:auto;max-height:none;aspect-ratio:16/9}}