:root{--navy:#06245f;--blue:#0e5bea;--orange:#ff5a12;--canvas:#eef2f7;--ink:#0a2a61;--muted:#687892;--line:#d8e0ea}*{box-sizing:border-box}html,body{margin:0;min-height:100%;max-width:100%;overflow:hidden}body{background:var(--canvas);color:var(--ink);font-family:"Noto Sans CJK JP","Hiragino Sans","Yu Gothic",sans-serif}button,select{font:inherit}button{cursor:pointer}.viewer-shell{width:100%;max-width:100vw;height:100dvh;display:flex;flex-direction:column;overflow:hidden}.topbar{width:100%;max-width:100vw;flex:none;min-height:68px;padding:10px 18px;display:flex;align-items:center;gap:18px;background:var(--navy);color:#fff;box-shadow:0 4px 18px rgba(6,36,95,.18);z-index:5}.brand{display:flex;align-items:center;gap:10px;min-width:210px}.brand-mark{width:42px;height:42px;border-radius:12px;background:#fff;color:var(--navy);display:grid;place-items:center;font-weight:900;font-size:17px;box-shadow:inset 0 -4px 0 #dce7ff}.brand strong{display:block;font-size:15px;letter-spacing:.02em}.brand small{display:block;color:#bcd0ff;font-size:10px;margin-top:2px}.selectors{display:flex;gap:9px;flex:1;min-width:0}.selectors label{display:flex;align-items:center;gap:7px;min-width:0}.selectors label:first-child{width:min(390px,42vw)}.selectors label:nth-child(2){width:min(340px,36vw)}.selectors span{font-size:11px;color:#bcd0ff;flex:none}.selectors select{min-width:0;max-width:100%;width:100%;height:38px;padding:0 34px 0 12px;border:1px solid rgba(255,255,255,.26);border-radius:9px;color:#fff;background:rgba(255,255,255,.09)}.selectors option{color:var(--navy);background:#fff}.actions{display:flex;align-items:center;gap:8px;flex:none}.actions button{height:38px;padding:0 14px;border:1px solid rgba(255,255,255,.28);border-radius:9px;color:#fff;background:rgba(255,255,255,.09);font-weight:700}.actions button:hover{background:rgba(255,255,255,.18)}.draft-badge{padding:6px 9px;border-radius:999px;background:var(--orange);font-size:10px;font-weight:800}.stage{width:100%;max-width:100vw;flex:1;min-width:0;min-height:0;display:grid;place-items:center;padding:16px 20px 10px}.slide-frame{position:relative;width:100%;min-width:0;height:auto;max-width:calc((100dvh - 126px)*16/9);max-height:100%;aspect-ratio:16/9;background:#fff;border-radius:11px;overflow:hidden;box-shadow:0 12px 38px rgba(23,44,82,.22)}.slide-frame>img{display:block;width:100%;height:100%;object-fit:contain}.hit-area{position:absolute;top:0;bottom:0;width:22%;border:0;background:transparent;opacity:0}.hit-area:hover{opacity:1}.hit-area.previous{left:0;background:linear-gradient(90deg,rgba(6,36,95,.1),transparent)}.hit-area.next{right:0;background:linear-gradient(270deg,rgba(6,36,95,.1),transparent)}.hidden-label{position:absolute;top:12px;right:12px;padding:7px 11px;border-radius:8px;background:var(--orange);color:#fff;font-size:12px;font-weight:800}.statusbar{flex:none;display:flex;align-items:center;gap:16px;padding:8px 20px 12px;color:var(--muted)}.page-copy{min-width:300px;display:flex;align-items:center;gap:9px;font-size:12px;white-space:nowrap;overflow:hidden}.page-copy b{color:var(--blue)}.page-copy span{overflow:hidden;text-overflow:ellipsis}.progress{flex:1;height:6px;border-radius:99px;overflow:hidden;background:#dbe2ec}.progress i{display:block;height:100%;border-radius:inherit;background:linear-gradient(90deg,var(--blue),var(--orange));transition:width .22s ease}.counter{min-width:58px;text-align:right;color:var(--ink);font-size:12px;font-weight:800}.index-overlay{position:fixed;inset:0;z-index:20;padding:24px;overflow:auto;background:rgba(2,17,48,.82);backdrop-filter:blur(5px)}.index-overlay[hidden]{display:none}.index-panel{max-width:1180px;margin:0 auto;padding:24px;border-radius:18px;background:#f7f9fc;box-shadow:0 26px 70px rgba(0,0,0,.32)}.index-heading{display:flex;justify-content:space-between;align-items:flex-start;padding-bottom:18px;border-bottom:2px solid var(--navy)}.index-heading small{color:var(--blue);font-weight:900;letter-spacing:.15em}.index-heading h2{margin:4px 0 0;font-size:clamp(25px,4vw,42px);font-weight:900;color:var(--navy)}.index-heading button{width:42px;height:42px;border-radius:50%;border:1px solid var(--line);background:#fff;color:var(--navy);font-size:26px}.chapter-group{padding:24px 0 8px}.chapter-group h3{display:flex;align-items:baseline;gap:10px;margin:0 0 12px;color:var(--navy);font-size:18px}.chapter-group h3 span{color:var(--orange);font-size:13px}.thumbnail-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:10px}.thumbnail-grid button{position:relative;padding:0;overflow:hidden;text-align:left;border:2px solid transparent;border-radius:10px;background:#fff;color:var(--navy);box-shadow:0 2px 10px rgba(14,42,87,.08)}.thumbnail-grid button.current{border-color:var(--orange)}.thumbnail-grid button:hover{transform:translateY(-2px);border-color:var(--blue)}.thumbnail-grid img{display:block;width:100%;aspect-ratio:16/9;object-fit:cover;background:#fff}.thumbnail-grid span{display:block;min-height:43px;padding:7px 9px;font-size:10.5px;line-height:1.4;font-weight:800}.thumbnail-grid em{position:absolute;top:7px;right:7px;padding:4px 7px;border-radius:6px;color:#fff;background:var(--orange);font-size:9px;font-style:normal;font-weight:800}@media(max-width:860px){.topbar{min-height:auto;padding:8px 10px;gap:8px;flex-wrap:wrap}.brand{min-width:0;flex:1}.brand-mark{width:36px;height:36px;border-radius:10px}.selectors{order:3;width:100%;flex:none}.selectors label:first-child,.selectors label:nth-child(2){width:calc(50% - 4.5px)}.selectors label span{display:none}.actions button{height:34px;padding:0 10px;font-size:12px}.actions #fullscreenButton{display:none}.stage{padding:8px}.slide-frame{max-width:100%}.statusbar{padding:7px 10px 10px;gap:9px}.page-copy{min-width:0;flex:1}.progress{display:none}.index-overlay{padding:10px}.index-panel{padding:16px;border-radius:14px}.thumbnail-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:7px}}@media(max-height:620px) and (orientation:landscape){.topbar{min-height:50px;padding-top:6px;padding-bottom:6px}.brand small,.selectors label span{display:none}.brand-mark{width:34px;height:34px}.selectors select,.actions button{height:34px}.stage{padding:6px 10px 3px}.slide-frame{max-width:calc((100dvh - 86px)*16/9)}.statusbar{padding-top:4px;padding-bottom:6px}}