:root{--blue:#006ebf;--light-blue:#339dd7;--yellow:#f5a800;--ink:#172033;--muted:#657387;--line:#dfe7ef;--soft:#f4f9fe;--white:#fff;--site-font:-apple-system,"San Francisco","Helvetica Neue",Helvetica,"Droid Sans",Arial,"PingFang SC","Droid Sans Fallback",sans-serif}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--site-font);color:var(--ink);background:#fff;line-height:1.6}
body,body *,body *::before,body *::after{font-family:var(--site-font)!important}
button,input,select,textarea{font-family:var(--site-font)!important}
a{text-decoration:none;color:inherit}
.container{width:min(980px,calc(100% - 48px));margin:0 auto}
.procurement-strip{width:100%;border-bottom:1px solid rgba(255,255,255,.18);background:linear-gradient(90deg,#006ebf 0%,#005a9e 100%);color:rgba(255,255,255,.92);font-size:15px;line-height:1.28}
.procurement-strip-inner{max-width:1500px;margin:0 auto;padding:5px 28px;display:flex;align-items:center;justify-content:space-between;gap:18px}
.procurement-strip-copy{display:flex;align-items:center;gap:8px;min-width:0;flex-wrap:wrap}
.procurement-strip strong{color:#fff;font-weight:600}
.brand-title{display:inline-flex;align-items:center;gap:.38em;flex-wrap:wrap}
.brand-name{display:inline-flex;align-items:center;letter-spacing:.08em;font-weight:600}
.brand-separator{display:inline-flex;align-items:center;color:currentColor;opacity:.72;font-weight:500}
.procurement-contacts{display:flex;align-items:center;justify-content:flex-end;gap:12px;white-space:nowrap;color:#fff}
.procurement-contact{display:inline-flex;align-items:center;justify-content:center;gap:5px;color:#fff!important;font-size:15px;font-weight:500;text-decoration:none;transition:opacity .12s ease}
.procurement-contact-icon{display:inline-flex;align-items:center;justify-content:center;color:#fff!important;font-size:14px;line-height:1}
.procurement-contact-icon.mail-icon{font-size:21.6px;transform:translateY(-1px)}
.procurement-contact:hover{opacity:.82}
.hero{padding:58px 0 42px;text-align:center;background:linear-gradient(180deg,#f0f8ff 0%,#fff 100%);border-bottom:1px solid var(--line)}
.page-top-row{position:relative;z-index:5;display:flex;align-items:center;justify-content:space-between;gap:18px;margin-bottom:18px;text-align:left}
.breadcrumb{color:var(--muted);font-size:14px;line-height:1.4}
.breadcrumb a{color:inherit;text-decoration:none}
.breadcrumb a:hover{color:var(--blue)}
.home-back-link{position:relative;z-index:6;pointer-events:auto;display:inline-flex;align-items:center;gap:6px;color:#2f80ed!important;-webkit-text-fill-color:#2f80ed!important;background:transparent!important;border:0;font-size:16px;line-height:1.35;font-weight:400;text-decoration-line:underline!important;text-underline-offset:3px;text-decoration-thickness:1px;transition:color .15s ease;white-space:nowrap}
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.home-back-link:hover{color:#1d5fb8!important;-webkit-text-fill-color:#1d5fb8!important;background:transparent!important;text-decoration-line:underline!important}
.hero-mark{position:relative;display:grid;place-items:center;width:44px;height:44px;margin:0 auto 16px;border:2px solid var(--light-blue);border-radius:50%;color:var(--blue);font-size:17px;font-weight:700}
.hero-mark::after{content:"";position:absolute;bottom:-11px;width:2px;height:8px;background:var(--light-blue)}
.hero-en{color:var(--blue);font-size:14px;font-weight:700;letter-spacing:1.2px;text-transform:uppercase}
.hero h1{margin-top:8px;font-size:clamp(30px,4vw,42px);line-height:1.2}
.hero p{max-width:620px;margin:14px auto 0;color:var(--muted);font-size:15px}
main{padding:38px 0 56px}
.section-head{display:flex;align-items:baseline;justify-content:space-between;gap:20px;margin-bottom:14px}
.section-head h2{font-size:22px}
.section-head span{color:var(--muted);font-size:13px}
.article-list{border-top:1px solid var(--line)}
.article{display:grid;grid-template-columns:94px minmax(0,1fr) 24px;gap:18px;align-items:center;padding:17px 12px;border-bottom:1px solid var(--line);transition:background .2s}
.article:hover{background:#f8fbfe}
.article-tag{color:var(--blue);font-size:13px}
.article h3{font-size:17px;font-weight:400;line-height:1.45}
.article p{margin-top:4px;color:var(--muted);font-size:13px}
.arrow{color:var(--blue);font-size:18px;text-align:right}
.other-topics{margin-top:32px;padding-top:24px;border-top:1px solid var(--line)}
.other-topics h2{font-size:19px;margin-bottom:12px}
.topic-links{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:12px}
.topic-links a{display:flex;align-items:center;justify-content:center;gap:7px;padding:10px 0;border-bottom:1px solid var(--line);color:#53647a;font-size:16px;text-align:center}
.topic-links a::before{display:inline-grid;place-items:center;min-width:20px;width:20px;height:20px;line-height:20px;color:var(--blue);font-size:15px;font-weight:700}
.topic-links a.topic-fundamentals::before{content:"m";display:inline-flex;align-items:center;justify-content:center;min-width:18px;width:18px;height:18px;line-height:1;text-align:center;border:1px solid currentColor;border-radius:50%;font-size:10.8px;transform:translateY(.5px)}
body.calculation-topic .topic-links a.topic-fundamentals::before,body.topic-m-calibrated .topic-links a.topic-fundamentals::before{transform:translate(1px,-.5px)}
.topic-links a.topic-selection::before{content:"↔";font-size:15.75px;transform:translateY(-1px)}
.topic-links a.topic-calculation::before{content:"d/z";font-size:12.13px}
.topic-links a.topic-installation::before{content:"⚙";font-size:17.64px;transform:translateY(-1px)}
.topic-links a.topic-troubleshooting::before{content:"!";min-width:16px;width:16px;height:16px;line-height:16px;border:1px solid currentColor;border-radius:50%;font-size:10.4px}
.topic-links a.topic-khk::before{content:"KHK";min-width:16px;width:16px;height:16px;line-height:16px;font-size:6.8px;letter-spacing:-.3px;border:1px solid currentColor}
.topic-links a:hover{color:var(--blue);border-color:var(--blue)}
.note{display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:32px;margin-top:30px;padding:34px 38px;border:1px solid #d9e7f2;border-radius:8px;background:linear-gradient(125deg,#eff8ff 0%,#f8fbfe 52%,#fff8e8 100%)}
.note h2{font-size:24px;line-height:1.3;font-weight:500}
.note p{max-width:630px;margin-top:8px;color:var(--muted);font-size:14px}
.help-actions{display:flex;gap:10px;flex-wrap:wrap}
.primary-link,.secondary-link{display:inline-flex;align-items:center;justify-content:center;min-height:42px;padding:0 18px;border-radius:5px;font-size:14px;white-space:nowrap}
.primary-link{background:linear-gradient(180deg,var(--light-blue),var(--blue));color:#fff}
.primary-link:hover{filter:brightness(.96)}
.secondary-link{border:1px solid #e9a20b;border-bottom:2px solid #dc9708;color:#172033;background:linear-gradient(180deg,#ffe565 0%,#ffc51b 48%,#f2a90a 100%);box-shadow:inset 0 1px 0 rgba(255,255,255,.9),inset 0 -1px 2px rgba(155,91,0,.10),0 5px 10px rgba(159,102,0,.18);transition:transform .12s ease,box-shadow .12s ease,filter .12s ease}
.secondary-link:hover{border-color:#e9a20b;background:linear-gradient(180deg,#ffed83 0%,#ffd135 48%,#f5b315 100%);color:#172033;filter:saturate(1.04)}
.back{display:inline-flex;align-items:center;gap:6px;margin-top:28px;padding:0;color:#2f80ed;background:transparent;border:0;font-size:16px;line-height:1.35;font-weight:400;text-decoration-line:underline!important;text-underline-offset:3px;text-decoration-thickness:1px;border-radius:0;transition:color .15s ease}
.back::before{content:"";width:20px;height:20px;display:inline-block;flex:0 0 auto;background:currentColor;-webkit-mask:url("data:image/svg+xml,%3Csvg%20t%3D%221788619478602%22%20class%3D%22icon%22%20viewBox%3D%220%200%201024%201024%22%20version%3D%221.1%22%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20p-id%3D%2223427%22%20xmlns%3Axlink%3D%22http%3A%2F%2Fwww.w3.org%2F1999%2Fxlink%22%20width%3D%22200%22%20height%3D%22200%22%3E%3Cpath%20d%3D%22M900.32%20119H385c-17.29%200-31.11%2013.85-31.11%2027.67v235.16h58.79V177.77h373.51L634%20260.79c-10.38%203.44-13.82%2013.82-13.82%2024.2V731.1H412.72V572h-58.78v186.77c0%2017.29%2013.82%2027.67%2027.64%2027.67h238.64v110.67c0%2010.38%206.91%2020.73%2013.82%2024.2%206.91%206.91%2010.38%206.91%2017.29%206.91%203.47%200%2010.38%200%2013.85-3.44l242.05-134.89c10.38-3.44%2020.76-13.82%2020.76-27.64V146.66c0-13.82-13.82-27.67-27.67-27.67zM450.74%20516.69c24.23%200%2041.52-17.29%2041.52-41.49%200-20.76-17.29-41.49-41.52-41.49H295.15v-72.64c0-6.91-3.47-13.82-10.38-13.82-6.91-3.47-13.85-3.47-17.29%200l-162.54%20114.1c-3.47%206.94-6.94%2010.38-6.94%2017.29s3.47%2010.38%206.94%2013.85l162.54%20114.13c3.44%203.44%206.91%203.44%2010.38%203.44s6.91%200%206.91-3.44c6.91-3.47%2010.38-10.38%2010.38-13.85v-76.08h155.59z%22%20p-id%3D%2223428%22%20fill%3D%22%23ffffff%22%3E%3C%2Fpath%3E%3C%2Fsvg%3E") center / contain no-repeat;mask:url("data:image/svg+xml,%3Csvg%20t%3D%221788619478602%22%20class%3D%22icon%22%20viewBox%3D%220%200%201024%201024%22%20version%3D%221.1%22%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20p-id%3D%2223427%22%20xmlns%3Axlink%3D%22http%3A%2F%2Fwww.w3.org%2F1999%2Fxlink%22%20width%3D%22200%22%20height%3D%22200%22%3E%3Cpath%20d%3D%22M900.32%20119H385c-17.29%200-31.11%2013.85-31.11%2027.67v235.16h58.79V177.77h373.51L634%20260.79c-10.38%203.44-13.82%2013.82-13.82%2024.2V731.1H412.72V572h-58.78v186.77c0%2017.29%2013.82%2027.67%2027.64%2027.67h238.64v110.67c0%2010.38%206.91%2020.73%2013.82%2024.2%206.91%206.91%2010.38%206.91%2017.29%206.91%203.47%200%2010.38%200%2013.85-3.44l242.05-134.89c10.38-3.44%2020.76-13.82%2020.76-27.64V146.66c0-13.82-13.82-27.67-27.67-27.67zM450.74%20516.69c24.23%200%2041.52-17.29%2041.52-41.49%200-20.76-17.29-41.49-41.52-41.49H295.15v-72.64c0-6.91-3.47-13.82-10.38-13.82-6.91-3.47-13.85-3.47-17.29%200l-162.54%20114.1c-3.47%206.94-6.94%2010.38-6.94%2017.29s3.47%2010.38%206.94%2013.85l162.54%20114.13c3.44%203.44%206.91%203.44%2010.38%203.44s6.91%200%206.91-3.44c6.91-3.47%2010.38-10.38%2010.38-13.85v-76.08h155.59z%22%20p-id%3D%2223428%22%20fill%3D%22%23ffffff%22%3E%3C%2Fpath%3E%3C%2Fsvg%3E") center / contain no-repeat}
.back:hover{color:#1d5fb8;background:transparent;text-decoration-line:underline!important}
@media(max-width:720px){.procurement-strip-inner{padding:5px 18px;flex-direction:column;align-items:flex-start;gap:5px}.procurement-contacts{justify-content:flex-start;gap:10px;flex-wrap:wrap;white-space:normal}.topic-links{grid-template-columns:repeat(2,minmax(0,1fr))}.note{grid-template-columns:1fr;padding:28px}.help-actions{margin-top:-12px}}
@media(max-width:560px){.container{width:min(100% - 36px,980px)}.hero{padding:48px 0 34px}.article{grid-template-columns:1fr 20px;gap:5px 10px;padding:15px 4px}.article-tag{grid-column:1/-1}.arrow{grid-column:2;grid-row:2}.note{padding:22px}.primary-link,.secondary-link{width:100%}.topic-links{grid-template-columns:1fr}}