:root{font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;color:#243b4a;background:#f7fbfc;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;--accent: #28788c;--muted: #687c88;--line: #d9e6ea;--mask-color: #e0e7ea}*{box-sizing:border-box}body{margin:0;min-width:320px}button,input,select{font:inherit}button{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:44px;padding:10px 16px;border:1px solid #c8dce2;border-radius:8px;color:#315c6a;background:#f3fafb;font-size:13px;font-weight:700;cursor:pointer}button:hover{background:#e7f2f5}button:disabled{opacity:.45;cursor:default}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,main:focus-visible{outline:3px solid #a4d1dc;outline-offset:2px}a{color:inherit;text-decoration:none}.app{height:100vh;height:100dvh;display:flex;flex-direction:column}.topbar{min-height:64px;padding:max(6px,env(safe-area-inset-top)) max(24px,env(safe-area-inset-right)) 6px max(24px,env(safe-area-inset-left));display:flex;align-items:center;gap:16px;background:#f7fbfc;border-bottom:1px solid var(--line);flex-shrink:0}.brand{display:inline-flex;align-items:center;flex-shrink:0}.brand-logo{display:block;width:162px;height:36px}.ui-icon{display:block;width:20px;height:20px;flex-shrink:0}.welcome{flex:1;min-height:0;display:grid;place-items:center;padding:32px 20px;overflow:auto}.welcome-card{width:min(100%,480px);padding:28px;border:1px solid var(--line);border-radius:12px;background:#fff;box-shadow:0 5px 18px #294d5b0f}.welcome h1{margin:0;font-size:24px;font-weight:720;letter-spacing:-.02em}.welcome-description{margin:14px 0 24px;color:var(--muted);font-size:14px;line-height:1.8}.primary{color:#fff;background:#347f90;border-color:#347f90}.primary:hover{background:#286c7d}.open-button{width:100%;min-height:46px;font-size:15px;border-radius:10px}.privacy{color:var(--muted);font-size:11px;line-height:1.8;margin:20px 0 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h2{margin:0;font-size:13px;font-weight:700}.thumbnail-heading button{min-height:36px;width:36px;border:0;padding:6px;background:transparent}.thumbnail-scroll{overflow:auto;min-height:0;padding:4px 10px 12px;overscroll-behavior:contain}.thumbnail-item{display:flex;flex-direction:column;gap:8px;width:100%;padding:10px 6px 6px;margin-bottom:8px;border:2px solid transparent;border-radius:8px;color:var(--muted);background:transparent}.thumbnail-item:hover{background:#edf5f7}.thumbnail-item[aria-current=page]{border-color:#347f90;background:#eaf5f8;color:#24687a}.thumbnail-page{display:block;position:relative;isolation:isolate;background:#fff;box-shadow:0 1px 3px #294d5b1f}.thumbnail-number{display:block;font-size:12px;line-height:18px;font-variant-numeric:tabular-nums}.viewer-toolbar{min-height:52px;gap:12px}.viewer-toolbar .brand-logo{width:135px;height:30px}.viewer-toolbar button{min-height:36px;padding:6px 10px}.quiet{background:#fff}.open-compact{display:none}.file-name{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:12px;color:var(--muted)}.page-counter{white-space:nowrap;color:var(--muted);font-size:12px;font-variant-numeric:tabular-nums}.zoom-controls{display:flex;align-items:center;gap:2px;padding-left:8px;border-left:1px solid var(--line)}.zoom-controls button{border-color:transparent;min-width:32px;padding:6px;background:transparent;font-variant-numeric:tabular-nums}.zoom-controls button[aria-label="100%で表示"]{min-width:56px}.zoom-controls button:hover{background:#edf5f7}.zoom-controls 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button{border:0;background:transparent;min-width:44px;padding:8px}.slider-label{display:flex;justify-content:space-between;align-items:center;font-size:13px;font-weight:600;gap:8px}.slider-label output{color:var(--accent);font-size:12px;font-variant-numeric:tabular-nums}input[type=range]{width:100%;height:44px;margin:1px 0;accent-color:var(--accent);cursor:pointer}input.mask-left-slider{appearance:none;-webkit-appearance:none;background:transparent}.mask-left-slider::-webkit-slider-runnable-track{height:8px;border:1px solid #acbec6;border-radius:4px;background:linear-gradient(to right,#fff 0,#fff var(--mask-stop),var(--mask-color) var(--mask-stop),var(--mask-color) 100%)}.mask-left-slider::-webkit-slider-thumb{appearance:none;-webkit-appearance:none;width:20px;height:20px;margin-top:-7px;border:2px solid #fff;border-radius:50%;background:var(--accent);box-shadow:0 0 0 1px var(--accent)}.mask-left-slider::-moz-range-track{height:8px;border:1px solid #acbec6;border-radius:4px;background:linear-gradient(to right,#fff 0,#fff var(--mask-stop),var(--mask-color) var(--mask-stop),var(--mask-color) 100%)}.mask-left-slider::-moz-range-progress{background:transparent}.mask-left-slider::-moz-range-thumb{width:16px;height:16px;border:2px solid #fff;border-radius:50%;background:var(--accent);box-shadow:0 0 0 1px var(--accent)}.setting-help{font-size:11px;line-height:1.8;color:var(--muted);margin:0}.setting-divider{height:1px;background:var(--line);margin:20px 0}.page-select-label{display:flex;align-items:center;justify-content:space-between;font-size:12px;gap:12px;margin-bottom:18px}select{min-height:44px;border:1px solid #c8dce2;background:#fff;padding:6px 12px;border-radius:8px;color:inherit}.reset-button{width:100%;margin:22px 0 7px}.setting-help:last-child{text-align:center}@media(max-width:820px){.viewer-body.sidebar-open{grid-template-columns:minmax(0,1fr)}.thumbnail-panel{position:absolute;left:0;top:0;bottom:0;width:calc(188px + env(safe-area-inset-left));padding-left:env(safe-area-inset-left);z-index:10;box-shadow:4px 0 16px #294d5b1f}.sidebar-backdrop{display:block;position:absolute;inset:0;z-index:9;border:0;border-radius:0;background:#243b4a26}.sidebar-backdrop:hover{background:#243b4a26}.file-name,.settings-label{display:none}.viewer-toolbar .brand-logo{width:30px}.viewer-toolbar{gap:8px;padding-left:max(10px,env(safe-area-inset-left));padding-right:max(10px,env(safe-area-inset-right))}.viewer-toolbar .page-counter{margin-left:auto}.viewer-toolbar button{min-height:44px;padding:6px 8px}.zoom-controls{padding-left:4px;gap:0}.zoom-controls button{min-width:30px;padding:4px}.zoom-controls button[aria-label="100%で表示"]{min-width:50px}.viewport{padding-left:max(8px,env(safe-area-inset-left));padding-right:max(8px,env(safe-area-inset-right))}.settings-dialog{top:60px;padding:16px 18px}}@media(max-width:520px){.viewer-toolbar>.brand{display:none}.topbar{padding-left:max(16px,env(safe-area-inset-left));padding-right:max(16px,env(safe-area-inset-right))}.viewer-toolbar{gap:6px;padding-left:max(8px,env(safe-area-inset-left));padding-right:max(8px,env(safe-area-inset-right))}.open-full{display:none}.open-compact{display:inline}.welcome{padding:20px 16px}.welcome-card{padding:22px}.welcome h1{font-size:22px}}@media(max-height:500px)and (orientation:landscape){.viewer-toolbar{min-height:48px;padding-top:2px;padding-bottom:2px}.settings-dialog{top:52px;max-height:calc(100dvh - 60px - env(safe-area-inset-bottom))}.settings-heading{margin-bottom:4px}.setting-divider{margin:10px 0}.page-select-label{margin-bottom:5px}.reset-button{margin-top:10px}.welcome{padding:12px 16px;place-items:start center}.welcome-card{padding:20px 24px}.welcome-description{margin:10px 0 16px}}