:root{--blue:#185adb;--blue-dark:#1042a6;--ink:#17243c;--muted:#5a6880;--line:#dce3ee;--bg:#f5f7fb;--white:#fff;--soft:#edf3ff;--red:#b42318;--green:#17643b;--radius:18px;font:16px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif;color:var(--ink);background:var(--bg);color-scheme:light}
*{box-sizing:border-box}body{margin:0}a{color:var(--blue);text-decoration:none}a:hover{text-decoration:underline}button,input,select,textarea{font:inherit;color:inherit}button,a,input,select,textarea{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.55}a,button,input,select,textarea,summary{touch-action:manipulation}img{max-width:100%;height:auto;display:block}h1,h2,h3,p{margin:0}h1{font-size:clamp(1.75rem,3.2vw,2.5rem);line-height:1.2;letter-spacing:-.025em}h2{font-size:1.3rem;line-height:1.4}h3{font-size:1.05rem}small,.hint{font-size:.875rem;color:var(--muted);line-height:1.5}.muted{color:var(--muted)}[hidden]{display:none!important}:focus-visible{outline:3px solid #78a9ff;outline-offset:3px}input,select,textarea{width:100%;min-height:48px;border:1px solid #b9c6d8;background:var(--white);border-radius:10px;padding:.65rem .8rem;min-width:0}textarea{resize:vertical}input[type=checkbox],input[type=radio]{width:20px;height:20px;min-height:20px;accent-color:var(--blue);flex:none}fieldset{border:0;padding:0;margin:0;min-width:0}legend,label{font-weight:550}legend{margin-bottom:.55rem}.container{width:min(1160px,100% - 48px);margin-inline:auto}.site-header{background:#fffffff5;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20;backdrop-filter:blur(14px)}.header-inner{width:min(1160px,100% - 48px);margin:auto;display:flex;align-items:center;justify-content:space-between;gap:30px;min-height:82px}.brand{font-size:1.5rem;font-weight:760;color:var(--ink);letter-spacing:-.045em;white-space:nowrap}.brand span{color:var(--blue)}.brand:hover{text-decoration:none}.site-header nav{display:flex;gap:20px;align-items:center;flex-wrap:wrap}.site-header nav a{color:var(--muted);font-size:.9375rem;padding:24px 0;min-height:48px;position:relative}.site-header nav a[aria-current=page]{color:var(--blue);font-weight:650}.site-header nav a[aria-current=page]:after{content:"";height:3px;background:var(--blue);border-radius:3px;position:absolute;bottom:0;left:0;right:0}.site-header nav a.cart-nav{border-left:1px solid var(--line);padding-left:22px}.badge{background:var(--soft);padding:2px 7px;border-radius:20px;color:var(--blue);font-size:.8rem;font-weight:700}.page-heading{padding:42px 0 26px;max-width:820px}.page-heading p:not(.eyebrow){color:var(--muted);margin-top:12px}.eyebrow{text-transform:uppercase;letter-spacing:.11em;color:var(--blue);font-size:.75rem;font-weight:750;margin-bottom:10px}.panel{border:1px solid var(--line);background:var(--white);border-radius:var(--radius);padding:28px;min-width:0}.stack{display:flex;flex-direction:column;gap:22px}.calculator-layout{display:grid;grid-template-columns:minmax(0,1.4fr) minmax(0,1fr);gap:26px;align-items:start}.price-panel{position:sticky;top:106px}.price-panel h2{margin-bottom:22px}.price-panel .help-link{display:block;text-align:center;margin-top:16px}.field{display:flex;flex-direction:column;gap:8px}.field .hint{font-weight:400}.help-link{font-size:.875rem}.label-row{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}.check{display:flex;align-items:center;gap:8px;font-size:.875rem;font-weight:450}.choices{display:flex;gap:10px;flex-wrap:wrap}.choices label{position:relative;flex:1;min-width:130px}.choices input{position:absolute;inset:0;width:100%;height:100%;opacity:0;cursor:pointer}.choices span{display:block;border:1px solid var(--line);border-radius:10px;padding:10px 18px;text-align:center;font-weight:500}.choices input:checked+span{border-color:var(--blue);background:var(--soft);color:var(--blue);box-shadow:inset 0 0 0 1px var(--blue)}.choices input:focus-visible+span{outline:3px solid #78a9ff;outline-offset:2px}fieldset>.hint{margin-top:8px}.price-breakdown{margin:0 0 24px;display:grid;grid-template-columns:1fr auto;gap:13px 20px}.price-breakdown dt{color:var(--muted)}.price-breakdown dd{margin:0;text-align:right;white-space:nowrap}.total{border-top:1px solid var(--line);padding-top:20px;display:flex;align-items:baseline;justify-content:space-between;gap:16px;flex-wrap:wrap}.total span{font-size:.9375rem;color:var(--muted)}.total strong{font-size:1.85rem;line-height:1.3;letter-spacing:-.02em;white-space:nowrap}.price-panel .hint{margin:14px 0 20px}.button{min-height:48px;border:1px solid transparent;border-radius:10px;padding:11px 19px;display:inline-flex;justify-content:center;align-items:center;gap:8px;font-weight:600;text-align:center;line-height:1.5}.button:hover{text-decoration:none}.primary{background:var(--blue);color:white}.primary:hover{background:var(--blue-dark)}.secondary{background:var(--soft);color:var(--blue);border-color:#c5d7fc}.secondary:hover{background:#e0eaff}.full{width:100%}.link-button{background:transparent;border:0;padding:10px 0;min-height:44px;color:var(--blue);font-size:.9rem}.link-button:hover{text-decoration:underline}.link-button.muted{color:var(--muted)}.notice{font-size:.9375rem;padding:15px 18px;border:1px solid #bad1fc;border-radius:10px;background:var(--soft);overflow-wrap:anywhere}.notice.subtle{background:#f5f7fb;border-color:var(--line)}.notice.danger{color:var(--red);background:#fff2f0;border-color:#ffcdc7;margin-top:20px}.error{color:var(--red);font-size:.9375rem}.goods-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.goods-card{display:flex;flex-direction:column;gap:18px;min-width:0}.goods-card h2{font-size:1.08rem;overflow-wrap:anywhere}.goods-card p{font-size:.9375rem;color:var(--muted)}.goods-card .goods-bottom{margin-top:auto;display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}.goods-card strong{font-size:1.2rem}.heading-row{max-width:none;display:flex;align-items:center;justify-content:space-between;gap:16px}.actions{display:flex;gap:20px;align-items:center;flex-wrap:wrap}.checkout-layout{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(0,1fr);gap:24px;align-items:start}.cart-item{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:16px;padding:22px}.cart-item h2{font-size:1.05rem;overflow-wrap:anywhere}.cart-item .cart-price{text-align:right;white-space:nowrap;font-weight:650}.quantity{display:flex;align-items:center;gap:12px}.icon-button{display:inline-flex;justify-content:center;align-items:center;background:#f1f5fb;border:1px solid var(--line);border-radius:9px;min-width:44px;min-height:44px;font-size:1.25rem;line-height:1}.delete-item{color:var(--red);font-size:.875rem;padding-inline:10px;justify-self:end}.empty{text-align:center;padding:50px 24px}.empty p{margin:12px 0 24px;color:var(--muted)}.honeypot{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}.guides{display:flex;flex-direction:column;gap:16px}.guide{border:1px solid var(--line);border-radius:var(--radius);background:white;overflow:hidden}.guide summary{cursor:pointer;list-style:none;display:flex;align-items:center;gap:20px;padding:26px 28px}.guide summary::-webkit-details-marker{display:none}.guide summary:after{content:"+";font-size:1.6rem;font-weight:400;color:var(--blue);margin-left:auto;flex:none}.guide[open] summary:after{content:"−"}.guide[open] summary{border-bottom:1px solid var(--line);background:#f8faff}.guide summary strong{display:block;font-size:1.15rem;line-height:1.5}.guide summary small{display:block;margin-top:4px}.guide-number{font-size:.875rem;font-weight:750;display:grid;place-items:center;background:var(--soft);color:var(--blue);width:44px;height:44px;border-radius:12px;flex:none}.guide-content{max-width:850px;margin:auto;padding:28px 32px 34px}.guide-content>p,.guide-content>figure,.guide-content>table{margin-bottom:24px}.article-lead{font-size:1.08rem;color:#2e4467}.steps{padding-left:24px;margin:0 0 24px;display:grid;gap:14px}.steps li{padding-left:5px}.steps li::marker{color:var(--blue);font-weight:650}.guide-content figure{margin-inline:0;background:var(--bg);border:1px solid var(--line);border-radius:14px;padding:16px}.guide-content figure img{width:100%}figcaption{font-size:.875rem;color:var(--muted);margin-top:12px;line-height:1.5}.guide-content table{max-width:480px}.source{font-size:.875rem;color:var(--muted);line-height:1.6}.article-nav{display:flex;flex-wrap:wrap;gap:9px;margin:24px 0}.article-nav a{background:var(--soft);border-radius:8px;font-size:.875rem;padding:10px 12px}.install-step{padding:28px 0;border-top:1px solid var(--line);scroll-margin-top:120px}.install-step h2{margin-bottom:18px}.install-step>figure{margin:24px 0 0}.install-step .notice{margin-top:20px}table{border-collapse:collapse;width:100%;font-size:.9375rem;text-align:left}th,td{padding:11px 13px;border-bottom:1px solid var(--line);vertical-align:top}th{font-weight:650;background:#f5f8fd}caption{text-align:left;font-weight:650;margin-bottom:10px}.footer{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;border-top:1px solid var(--line);padding:25px 0;margin-top:56px;color:var(--muted);font-size:.875rem}.toast{position:fixed;left:50%;bottom:26px;transform:translateX(-50%);z-index:90;max-width:calc(100% - 32px);width:max-content;border-radius:12px;background:#16253e;color:white;box-shadow:0 8px 26px #17243c26;padding:13px 20px;font-size:.9375rem}.skip{position:fixed;top:-100px;left:20px;z-index:100;padding:10px;background:white}.skip:focus{top:10px}dialog{border:1px solid var(--line);border-radius:18px;padding:26px;color:var(--ink);width:min(580px,calc(100% - 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@media(max-width:920px){.goods-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.header-inner{gap:20px}.site-header nav{gap:16px}.calculator-layout,.checkout-layout{grid-template-columns:minmax(0,1.15fr) minmax(0,1fr)}.panel{padding:23px}.total strong{font-size:1.65rem}}
@media(max-width:700px){.container,.header-inner{width:calc(100% - 32px)}.header-inner{display:block;min-height:auto;padding-top:14px}.brand{font-size:1.3rem;display:inline-block;margin-bottom:6px}.site-header nav{display:grid;grid-template-columns:1fr .8fr 1.1fr 1fr;gap:5px;width:100%}.site-header nav a{padding:13px 2px;text-align:center;font-size:.875rem;overflow-wrap:anywhere;min-width:0}.site-header nav a.cart-nav{padding-left:7px;border-left:1px solid var(--line)}.page-heading{padding:28px 0 20px}.page-heading p:not(.eyebrow){font-size:.9375rem}.calculator-layout,.checkout-layout{grid-template-columns:1fr;gap:18px}.price-panel{position:static}.panel{padding:21px}.total strong{font-size:1.85rem}.guide summary{gap:13px;padding:20px 18px;align-items:flex-start}.guide summary strong{font-size:1rem}.guide summary small{font-size:.8125rem}.guide-number{width:34px;height:34px;border-radius:9px}.guide-content{padding:22px 20px}.guide-content figure{padding:8px}.guide-content img{min-width:0}.heading-row{align-items:flex-start;flex-direction:column}.actions{gap:24px}.install-step{scroll-margin-top:125px}.footer{margin-top:36px}.cart-item{padding:18px}.goods-grid{gap:14px}.goods-card{padding:18px}.goods-card .goods-bottom{align-items:stretch}.goods-bottom .button{width:100%}}
@media(max-width:420px){.goods-grid{grid-template-columns:1fr}.guide-content{padding:20px 16px}.label-row{align-items:flex-start;flex-direction:column;gap:6px}.price-breakdown{font-size:.9375rem;gap:12px}.cart-item{grid-template-columns:minmax(0,1fr) auto}.cart-price{font-size:.875rem}.header-inner,.container{width:calc(100% - 24px)}}
@media(prefers-reduced-motion:no-preference){button,.button,.choices span{transition:background-color .15s,border-color .15s}html{scroll-behavior:smooth}}
@media print{.site-header,.footer,button,.article-nav,.help-link,.button,.toast{display:none!important}.container{width:100%}.guide{break-inside:avoid;border:0}.guide-content{padding:0}.page-heading{padding:0 0 20px}body{background:white}}
/* Keep each section a separate working screen. */
#main{min-height:60vh}
@media(max-width:420px){.site-header nav{grid-template-columns:repeat(2,minmax(0,1fr));gap:0 12px}.site-header nav a{overflow-wrap:normal;padding:12px 4px}.site-header nav a.cart-nav{border-left:0;padding-left:4px}}