.operation-heading{display:flex;justify-content:space-between;align-items:center;gap:32px;padding:20px 0 30px}
.operation-heading .eyebrow{margin-bottom:12px}
.operation-heading h1{font-size:clamp(2rem,3.4vw,2.75rem);line-height:1.4;letter-spacing:-.025em}
.operation-heading p:not(.eyebrow){color:var(--muted);font-size:1rem;margin-top:16px}
.operation-heading>.text-link{flex-shrink:0}
.operation-modulebar{display:flex;align-items:center;justify-content:space-between;gap:24px;border-bottom:1px solid var(--line);padding-bottom:24px;margin-bottom:32px}
.operation-modulebar nav{display:flex;gap:10px}
.operation-modulebar nav a{padding:11px 20px;border:1px solid #d4e0ef;border-radius:10px;color:#536b87;display:flex;align-items:center;gap:12px;background:#fff;min-height:48px;font-weight:600}
.operation-modulebar nav a[aria-current]{background:var(--navy);border-color:var(--navy);color:white}
.operation-modulebar nav span{font-size:.875rem;font-weight:400;opacity:.8}
.operation-modulebar>span{font-size:.875rem;color:var(--muted);max-width:330px}
.operation-layout{display:grid;grid-template-columns:220px minmax(0,1fr);gap:36px;align-items:start;padding-bottom:64px}
.operation-sidebar{position:sticky;top:112px;min-width:0;border:1px solid var(--line);border-radius:12px;background:#f8fafd;padding:14px 10px}
.operation-sidebar>nav{max-height:calc(100dvh - 225px);overflow:auto;overscroll-behavior:contain;scrollbar-width:thin}
.operation-index-group+p{margin-top:12px}
.operation-index-group>p{font-size:.875rem;font-weight:600;color:#68819d;margin:10px 8px 8px}
.operation-index-group>a{display:flex;gap:8px;font-size:.875rem;line-height:1.75;padding:9px 8px;border-radius:7px;color:#425c7a;margin-bottom:2px}
.operation-index-group>a>span{font-size:.8125rem;min-width:25px;color:#6b88a8}
.operation-index-group>a:hover{background:#eaf1fb}
.operation-index-group>a[aria-current]{background:#e4efff;color:#125fac;font-weight:600}
.operation-return{display:block;padding:14px 8px 2px;border-top:1px solid #e0e8f3;margin-top:12px;font-size:.875rem;color:var(--blue)}
.operation-reader{min-width:0;scroll-margin-top:108px}
.operation-step{border:1px solid var(--line);border-radius:18px;background:#fff;overflow:hidden;margin-bottom:24px;scroll-margin-top:108px}
.operation-step[hidden]{display:none}
.operation-step-heading{padding:26px 30px;border-bottom:1px solid #e5ecf5}
.operation-counter{display:flex;align-items:center;flex-wrap:wrap;gap:10px;font-size:.875rem;color:var(--blue);font-weight:600;margin-bottom:12px}
.operation-counter>span{font-size:.8125rem;padding:3px 10px;border-radius:20px;background:#f0f4fa;color:#617894;font-weight:400}
.operation-step-heading h2{font-size:clamp(1.375rem,2vw,1.875rem);line-height:1.5;letter-spacing:-.025em}
.operation-step-heading h2:focus{outline:none}
.operation-step-heading>p:last-child{margin-top:12px;font-size:1rem;line-height:1.85;color:#59718d}
.operation-step-body{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(240px,.85fr);gap:28px;padding:26px;align-items:start}
.operation-figure{margin:0;min-width:0}
.operation-image{display:block;position:relative;width:100%;padding:0;border:1px solid #d8e2ef;border-radius:10px;overflow:hidden;background:#f3f6fa;cursor:zoom-in}
.operation-image img{width:100%;height:auto}
.operation-image-hint{display:flex;justify-content:center;align-items:center;gap:14px;padding:11px 8px;font-size:.875rem;color:var(--blue);border-top:1px solid #dce6f0;background:#f9fbff;min-height:44px}
.operation-instructions{min-width:0}
.operation-instructions>h3{font-size:1rem;line-height:1.6;margin-bottom:16px}
.operation-instructions>ol{list-style:none;counter-reset:instructions;margin:0;padding:0}
.operation-instructions>ol>li{counter-increment:instructions;position:relative;padding-left:30px;margin-bottom:22px;font-size:1rem;line-height:1.85}
.operation-instructions>ol>li:before{content:counter(instructions);position:absolute;left:0;top:3px;width:21px;height:21px;border-radius:50%;display:grid;place-items:center;font-size:.8125rem;color:#b53332;background:#fff0ef;font-weight:600}
.operation-instructions li strong{color:#ad3736;font-weight:600}
.operation-instructions li p{color:#536b86;margin-top:6px;line-height:1.9}
.operation-note{padding:18px;background:#f1f6fd;border:1px solid #dce7f5;border-radius:10px;margin-top:24px;font-size:1rem;line-height:1.9}
.operation-note>strong{display:block;font-size:.9375rem;font-weight:600;margin-bottom:8px;color:#36597e}
.operation-note p{color:#536c88}
.operation-note-important{background:#fff8ed;border-color:#f0ddbc}
.operation-note-important>strong{color:#835b28}
.operation-timing-limit{font-size:.9375rem;color:#855725;line-height:1.85;margin-top:16px}
.operation-mobile-picker{display:none}
.operation-pager{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:18px 0;border-bottom:1px solid var(--line)}
.operation-pager[hidden]{display:none}
.operation-pager button{border:1px solid #cbdcee;border-radius:9px;background:#fff;color:var(--blue);font-size:1rem;padding:10px 20px;min-height:48px}
.operation-pager button:last-child{background:var(--blue);color:white;border-color:var(--blue)}
.operation-pager button:disabled{opacity:.42;cursor:default}
.operation-pager>span{font-size:.875rem;color:#68809c;white-space:nowrap}
.operation-reader-end{display:flex;justify-content:space-between;flex-wrap:wrap;gap:16px;padding:22px 0;color:var(--blue);font-size:.875rem}
.operation-zoom{padding:0;border:0;border-radius:14px;width:min(1200px,calc(100% - 32px));max-width:calc(100% - 32px);height:calc(100dvh - 36px);max-height:calc(100dvh - 36px);background:#e7edf5;overflow:hidden;color:var(--text)}
.operation-zoom::backdrop{background:#091c35c9;backdrop-filter:blur(4px)}
.operation-zoom[open]{display:flex;flex-direction:column}
.operation-zoom-toolbar{display:flex;align-items:center;gap:12px;padding:12px 18px;background:white;border-bottom:1px solid #d3dfed;flex-shrink:0}
.operation-zoom-toolbar h2{flex:1;min-width:0;font-size:1rem;line-height:1.6;letter-spacing:0}
.operation-zoom-toolbar button{border:1px solid #cddced;border-radius:8px;background:#f5f9ff;padding:9px 13px;font-size:.875rem;color:#235e9f;min-height:44px;white-space:nowrap}
.operation-zoom-scroll{flex:1;min-height:0;overflow:auto;overscroll-behavior:contain;touch-action:pan-x pan-y pinch-zoom}
.operation-zoom-scroll>img{display:block;width:100%;max-width:960px;height:auto;margin:0 auto}
.operation-zoom-open{overflow:hidden}
@media(max-width:1100px){.operation-layout{grid-template-columns:190px minmax(0,1fr);gap:24px}.operation-step-body{grid-template-columns:1fr;gap:24px}.operation-figure{max-width:550px;margin:0 auto;width:100%}.operation-modulebar>span{max-width:240px}.operation-step-heading{padding:24px}.operation-step-body{padding:24px}}
@media(max-width:760px){.operation-heading{display:block;padding:18px 0 24px}.operation-heading h1{font-size:1.875rem}.operation-heading>.text-link{margin-top:18px}.operation-modulebar{display:block;padding-bottom:20px;margin-bottom:22px}.operation-modulebar nav{display:grid;grid-template-columns:1fr 1fr}.operation-modulebar nav a{padding:10px 14px;justify-content:center;flex-wrap:wrap;gap:0 10px;font-size:1rem}.operation-modulebar nav span{font-size:.8125rem}.operation-modulebar>span{display:block;font-size:.875rem;max-width:none;margin-top:14px;line-height:1.8}.operation-layout{display:block;padding-bottom:40px}.operation-sidebar{position:static;margin-bottom:24px}.operation-sidebar>nav{max-height:230px}.operation-enhanced .operation-sidebar{display:none}.operation-enhanced .operation-mobile-picker{display:block;margin-bottom:20px}.operation-mobile-picker label{display:block;font-size:.875rem;color:#617b98;margin-bottom:8px}.operation-mobile-picker select{width:100%;min-width:0;max-width:100%;min-height:48px;padding:10px 12px;border:1px solid #cbdaed;border-radius:9px;font-size:1rem;color:var(--navy);background:#fff}.operation-reader,.operation-step{scroll-margin-top:90px}.operation-step{border-radius:12px;margin-bottom:10px}.operation-step-heading{padding:22px 20px}.operation-step-heading h2{font-size:1.375rem}.operation-counter{font-size:.875rem}.operation-step-body{padding:18px;gap:24px}.operation-instructions>ol>li{font-size:1rem}.operation-note{font-size:1rem;padding:16px}.operation-pager{padding:16px 0;gap:8px}.operation-pager button{font-size:.9375rem;padding:10px 14px;min-height:48px}.operation-pager>span{font-size:.8125rem}.operation-reader-end{font-size:.875rem}.operation-zoom{width:100%;max-width:100%;height:100dvh;max-height:100dvh;border-radius:0;margin:0}.operation-zoom-toolbar{padding:10px 12px;gap:8px;flex-wrap:wrap}.operation-zoom-toolbar h2{flex-basis:100%;font-size:1rem}.operation-zoom-toolbar button{font-size:.875rem}.operation-zoom-toolbar button:last-child{margin-left:auto}}
/* Reading flow: normal steps and questions use separate navigation. */
.operation-step-body{grid-template-areas:"image instructions"}
.operation-instructions{grid-area:instructions}.operation-figure{grid-area:image}
.operation-branch{margin-top:20px;min-height:44px;line-height:1.7}
.operation-questions{padding:28px 0 10px;scroll-margin-top:110px}.operation-questions h2,.operation-finish h2{font-size:1.25rem;line-height:1.6}
.operation-questions>p,.operation-finish>p{font-size:1rem;color:var(--muted);margin:12px 0;line-height:1.85}
.operation-questions>div{display:grid;gap:10px;margin-top:18px}.operation-questions a{display:flex;justify-content:space-between;align-items:center;gap:14px;padding:14px 18px;min-height:52px;border:1px solid var(--line);border-radius:10px;color:var(--blue);font-size:1rem}
.operation-questions a:hover{background:#f3f7ff}.operation-finish{padding:22px;background:#f0f7ff;border:1px solid #d2e3f7;border-radius:12px;margin-top:22px}.operation-finish[hidden]{display:none}
@media(max-width:1100px){.operation-step-body{grid-template-areas:"image" "instructions"}}
@media(max-width:760px){.operation-step-body{grid-template-areas:"instructions" "image"}.operation-pager{position:fixed;left:0;right:0;bottom:0;z-index:45;background:#fffffffa;backdrop-filter:blur(12px);border-top:1px solid #cddceb;box-shadow:0 -3px 18px #122b4d0d;padding:10px 12px calc(10px + env(safe-area-inset-bottom));gap:8px}.operation-pager button{padding:10px 12px;font-size:.875rem;min-height:46px}.operation-pager>span{font-size:.8125rem}.has-operation-reader{padding-bottom:calc(88px + env(safe-area-inset-bottom))}.has-operation-reader .back-top{bottom:calc(92px + env(safe-area-inset-bottom))}.operation-questions{scroll-margin-top:90px}.operation-questions a{font-size:.9375rem;padding:14px}.operation-finish{padding:18px}}