:root{color-scheme:light;--paper:#fcfbf8;--ink:#203039;--muted:#586973;--accent:#245d72;--line:#d9dfdf;--panel:#eef2f2;font-family:Segoe UI,Arial,sans-serif;color:var(--ink);background:var(--paper)}
*{box-sizing:border-box}body{margin:0;min-height:100dvh;background:var(--paper);color:var(--ink)}button{font:inherit;color:inherit;border:1px solid var(--line);background:transparent;border-radius:5px;padding:9px 14px;cursor:pointer}button:hover{background:var(--panel)}button:disabled{opacity:.3;cursor:default}button:focus-visible,a:focus-visible{outline:3px solid var(--accent);outline-offset:3px}a{color:var(--accent)}
.toolbar{height:76px;padding:0 4vw;display:flex;align-items:center;gap:30px;border-bottom:1px solid var(--line);background:var(--paper);position:relative;z-index:5}.brand{text-decoration:none;color:var(--ink);font-size:21px;font-weight:700;letter-spacing:.08em}.brand span{color:var(--muted);font-weight:400}.title{color:var(--muted);font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.toolbar nav{display:flex;gap:7px;margin-left:auto}.toolbar button{padding:8px 11px}.theme{font-size:20px;line-height:1;min-width:40px}
.deck{height:calc(100dvh - 146px);position:relative;display:grid;place-items:center;overflow:hidden;background:#e5e9e8}.page{width:min(96vw,calc((100dvh - 175px)*1.7778));height:min(90vh,calc(96vw/1.7778));position:relative;display:grid;place-items:center;box-shadow:0 12px 42px rgba(24,42,50,.18);background:#fff}.page canvas{display:block;width:100%;height:100%}.loading{position:absolute;color:#526772;font-size:17px;display:grid;gap:12px;text-align:center;place-items:center}.loading[hidden]{display:none}.spinner{width:28px;height:28px;border:3px solid #b8c8cc;border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}
.empty{padding:6vw;line-height:1.55}.empty h1{font-size:clamp(30px,4vw,58px);font-weight:600;letter-spacing:-.04em}.empty p{font-size:20px;color:var(--muted)}
.controls{height:70px;padding:0 4vw;display:flex;align-items:center;justify-content:space-between;gap:20px;position:relative;background:var(--paper);border-top:1px solid var(--line);font-size:13px;color:var(--muted)}.pager{display:flex;gap:16px;align-items:center}.pager button{font-size:22px;padding:3px 16px}.pager output{font-variant-numeric:tabular-nums;min-width:75px;text-align:center;color:var(--ink)}.progress{position:absolute;bottom:0;left:0;right:0;height:3px;background:var(--line)}.progress-value{height:100%;width:0;background:var(--accent);transition:width .25s ease}.hint span{color:var(--muted)}
dialog{border:1px solid var(--line);border-radius:10px;padding:28px;color:var(--ink);background:var(--paper);max-height:85dvh;width:min(850px,92vw)}dialog::backdrop{background:rgba(25,38,44,.45)}.dialog-heading{display:flex;justify-content:space-between;align-items:center;gap:15px;margin-bottom:20px}.dialog-heading h2{margin:0;font-size:30px;font-weight:600}.close{padding:5px 10px}#overview nav{display:grid;gap:3px;max-height:66dvh;overflow:auto}#overview nav button{display:grid;grid-template-columns:40px 1fr;gap:10px;text-align:left;border:0;padding:11px}.slide-no{color:var(--muted);font-variant-numeric:tabular-nums}#overview nav button[aria-current]{background:var(--panel)}
:root[data-theme="dark"]{color-scheme:dark;--paper:#151d23;--ink:#e5edf1;--muted:#afbec8;--accent:#8dcde1;--line:#384751;--panel:#223039}.dark-canvas{filter:none}
@media(max-width:760px){.toolbar{height:65px;padding:0 13px;gap:9px}.toolbar .title{display:none}.toolbar nav{gap:4px}.toolbar button{padding:8px}.theme{min-width:36px}.deck{height:calc(100dvh - 129px)}.page{width:100vw;height:56.25vw;box-shadow:0 7px 25px rgba(24,42,50,.16)}.controls{height:64px;justify-content:center;padding:0 12px}.hint,.credit{display:none}.pager{gap:12px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important}}
@media print{.toolbar,.controls,dialog{display:none!important}.deck{height:auto;background:white}.page{width:100%;height:auto;box-shadow:none}.page canvas{width:100%;height:auto}.empty{display:none}}

/* Screen-reader page announcements stay accessible without a visual grid row. */
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);clip-path:inset(50%);white-space:nowrap;border:0}