:root{--blue:#006ebf;--light:#339dd7;--yellow:#f5a800;--ink:#172033;--muted:#657387;--line:#dfe7ef;--soft:#f4f9fe;--site-font:-apple-system,"San Francisco","Helvetica Neue",Helvetica,"Droid Sans",Arial,"PingFang SC","Droid Sans Fallback",sans-serif}*{box-sizing:border-box}html,body{font-family:var(--site-font)!important}body{margin:0;font-family:var(--site-font)!important;color:var(--ink);background:#fff;line-height:1.75}.container{width:min(860px,calc(100% - 48px));margin:0 auto}body,body *,body *::before,body *::after{font-family:var(--site-font)!important}button,input,select,textarea{font-family:var(--site-font)!important}.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;font-family:var(--site-font)!important}.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-strip .brand-name{padding:0;background:transparent;box-shadow:none}.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}.article-top-row{position:relative;z-index:5;display:flex;align-items:center;justify-content:space-between;gap:18px;margin-bottom:18px}.article-crumb{color:var(--muted);font-size:14px;line-height:1.4}.article-crumb a{color:inherit;text-decoration:none}.article-crumb 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-family:var(--site-font)!important;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;-webkit-background-clip:border-box!important;background-clip:border-box!important}.home-back-link::before{content:"";width:17px;height:17px;display:inline-block;flex:0 0 auto;background:currentColor;-webkit-mask:url("data:image/svg+xml,%3Csvg%20viewBox%3D%220%200%201024%201024%22%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%3E%3Cpath%20d%3D%22M1002.7584%20475.776L566.2784%2039.68%20537.1584%2010.24a35.584%2035.584%200%200%200-50.176%200L21.2544%20475.776A72.192%2072.192%200%200%200%200.0064%20527.744a72.96%2072.96%200%200%200%2073.28%2071.488h48v367.872h781.44V599.232h49.024c19.264%200%2037.44-7.552%2051.136-21.184%2013.696-13.696%2021.12-31.872%2021.12-51.2%200-19.2-7.552-37.376-21.248-51.072z%20m-427.52%20410.048H448.7744v-230.4h126.464v230.4z%20m246.144-367.872v367.872h-173.824V628.288a45.184%2045.184%200%200%200-45.184-45.184H421.6384a45.184%2045.184%200%200%200-45.184%2045.184v257.536H202.6304V517.952H94.2144l417.92-417.6%2026.048%2026.112%20391.68%20391.488h-108.48z%22%2F%3E%3C%2Fsvg%3E") center / contain no-repeat;mask:url("data:image/svg+xml,%3Csvg%20viewBox%3D%220%200%201024%201024%22%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%3E%3Cpath%20d%3D%22M1002.7584%20475.776L566.2784%2039.68%20537.1584%2010.24a35.584%2035.584%200%200%200-50.176%200L21.2544%20475.776A72.192%2072.192%200%200%200%200.0064%20527.744a72.96%2072.96%200%200%200%2073.28%2071.488h48v367.872h781.44V599.232h49.024c19.264%200%2037.44-7.552%2051.136-21.184%2013.696-13.696%2021.12-31.872%2021.12-51.2%200-19.2-7.552-37.376-21.248-51.072z%20m-427.52%20410.048H448.7744v-230.4h126.464v230.4z%20m246.144-367.872v367.872h-173.824V628.288a45.184%2045.184%200%200%200-45.184-45.184H421.6384a45.184%2045.184%200%200%200-45.184%2045.184v257.536H202.6304V517.952H94.2144l417.92-417.6%2026.048%2026.112%20391.68%20391.488h-108.48z%22%2F%3E%3C%2Fsvg%3E") center / contain no-repeat}.home-back-link:visited{color:#2f80ed!important;-webkit-text-fill-color:#2f80ed!important}.home-back-link:hover{color:#1d5fb8!important;-webkit-text-fill-color:#1d5fb8!important;background:transparent!important;text-decoration-line:underline!important}.hero{padding:48px 0 32px;background:linear-gradient(180deg,#f1f8ff 0%,#fff 100%);border-bottom:1px solid var(--line)}.type{color:var(--blue);font-size:13px}.hero h1{margin:8px 0 0;font-size:clamp(28px,4vw,40px);line-height:1.3}.article{padding:36px 0 54px}.lead{margin:0 0 26px;color:var(--muted);font-size:16px}.article h2{margin:30px 0 10px;font-size:21px}.article p{margin:10px 0;color:#405168;font-size:15px}.article ul{padding-left:22px;color:#405168;font-size:15px}.article li+li{margin-top:6px}.formula{margin:18px 0;padding:16px 20px;border-left:3px solid var(--blue);background:var(--soft);color:var(--ink);font-weight:700}.tip{margin-top:30px;padding:20px 24px;border:1px solid #d7e7f2;border-radius:7px;background:#f8fbfe}.tip strong{display:block;font-size:16px}.tip p{margin:4px 0 0;font-size:14px}.back{display:inline-block;margin-top:32px;color:#5f6f82;font-size:13px;text-decoration:none}.back::before{content:"←";margin-right:8px;color:var(--yellow)}.back:hover{color:var(--blue)}.article-nav{display:flex;align-items:center;gap:20px;margin-top:32px;padding-top:18px;border-top:1px solid var(--line);font-size:13px}.article-nav a{color:#5f6f82;text-decoration:none;transition:color .2s}.article-nav a:hover{color:var(--blue)}.article-nav .return-base{display:inline-flex;align-items:center;gap:6px;padding:0!important;color:#2f80ed!important;background:transparent!important;border:0!important;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}.article-nav .return-base::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}.article-nav .return-base:hover{color:#1d5fb8!important;background:transparent!important;text-decoration-line:underline!important}.article-nav .previous::before{content:"";width:20px;height:20px;margin-right:4px;display:inline-block;vertical-align:-5px;background:currentColor;transform:scaleX(-1) scaleY(-1);transform-origin:center;-webkit-mask:url("data:image/svg+xml,%3Csvg%20viewBox%3D%270%200%2024%2024%27%20xmlns%3D%27http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%27%3E%3Cpath%20d%3D%27M13%205l7%207-7%207v-4H7a4%204%200%20010-8h3v2H7a2%202%200%20000%204h6v-4z%27%2F%3E%3C%2Fsvg%3E") center / contain no-repeat;mask:url("data:image/svg+xml,%3Csvg%20viewBox%3D%270%200%2024%2024%27%20xmlns%3D%27http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%27%3E%3Cpath%20d%3D%27M13%205l7%207-7%207v-4H7a4%204%200%20010-8h3v2H7a2%202%200%20000%204h6v-4z%27%2F%3E%3C%2Fsvg%3E") center / contain no-repeat}.article-nav .next{margin-left:auto;text-align:right}.article-nav .next::after{content:"";width:20px;height:20px;margin-left:4px;display:inline-block;vertical-align:-5px;background:currentColor;transform:scaleY(-1);transform-origin:center;-webkit-mask:url("data:image/svg+xml,%3Csvg%20viewBox%3D%270%200%2024%2024%27%20xmlns%3D%27http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%27%3E%3Cpath%20d%3D%27M13%205l7%207-7%207v-4H7a4%204%200%20010-8h3v2H7a2%202%200%20000%204h6v-4z%27%2F%3E%3C%2Fsvg%3E") center / contain no-repeat;mask:url("data:image/svg+xml,%3Csvg%20viewBox%3D%270%200%2024%2024%27%20xmlns%3D%27http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%27%3E%3Cpath%20d%3D%27M13%205l7%207-7%207v-4H7a4%204%200%20010-8h3v2H7a2%202%200%20000%204h6v-4z%27%2F%3E%3C%2Fsvg%3E") center / contain no-repeat}@media(max-width:560px){.container{width:min(100% - 36px,860px)}.hero{padding:38px 0 26px}.article{padding-top:28px}.article p,.article ul{font-size:14px}.article-nav{flex-wrap:wrap;gap:12px}.article-nav .next{width:100%;margin-left:0;text-align:left}}