#concrete13-page{--c13-ink:#234627;--c13-accent:#234627;--c13-source:#234627;--c13-border:#dedede;color:var(--c13-ink);background:#fff;font:16px/1.7 system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;width:100%;margin:0;isolation:isolate}
#concrete13-page *,#concrete13-page *::before,#concrete13-page *::after{box-sizing:border-box}
#concrete13-page [hidden]{display:none!important}
#concrete13-page .c13-shell{max-width:1180px;margin:auto;padding:0 28px}
#concrete13-page h1,#concrete13-page h2,#concrete13-page h3,#concrete13-page p,#concrete13-page ul,#concrete13-page figure{margin:0}
#concrete13-page a{color:#234627;text-decoration:underline;text-underline-offset:4px;overflow-wrap:anywhere}
#concrete13-page a.external{color:var(--c13-source)}
#concrete13-page a:focus-visible,#concrete13-page button:focus-visible,#concrete13-page summary:focus-visible{outline:3px solid var(--c13-source);outline-offset:4px}
#concrete13-page .c13-hero{padding:64px 0 44px;background:radial-gradient(ellipse at 96% 5%,#edf4eb 0%,#fff 62%);border-bottom:1px solid #eee}
#concrete13-page .c13-hero-grid{display:grid;grid-template-columns:minmax(0,1.45fr) minmax(0,.7fr);gap:68px;align-items:center}
#concrete13-page .c13-kicker{font-size:11px;letter-spacing:1.7px;font-weight:750;display:block;line-height:1.5}
#concrete13-page .c13-hero .c13-kicker::before{content:"";display:inline-block;width:22px;height:4px;background:var(--c13-accent);vertical-align:middle;margin-right:10px}
#concrete13-page h1{font-size:clamp(34px,4.5vw,58px);line-height:1.1;letter-spacing:-1.8px;margin:19px 0 24px;font-weight:780;max-width:760px}
#concrete13-page .c13-hero p{max-width:720px;color:#444;margin:0 0 14px;font-size:16px;line-height:1.7}
#concrete13-page .c13-hero-links{display:flex;flex-wrap:wrap;gap:16px 24px;align-items:center;margin-top:24px}
#concrete13-page .c13-button-link{background:#234627;color:#fff;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:12px 21px;border-radius:8px;font-size:14px;font-weight:650}
#concrete13-page .c13-hero-art{min-width:0;border:1px solid #edf4eb;border-radius:20px;background:#fff;padding:28px;box-shadow:0 16px 40px #23462706;transform:rotate(2deg)}
#concrete13-page .c13-hero-art svg{width:100%;height:auto;display:block}
#concrete13-page .c13-art-caption{font-size:12px;text-align:center;color:#555;letter-spacing:.2px;padding-top:14px;border-top:1px solid #eee;margin-top:12px}
#concrete13-page .c13-trust-row{display:flex;flex-wrap:wrap;gap:15px 30px;font-size:12px;color:#555;margin-top:26px}
#concrete13-page .c13-trust-row span::before{content:"✓";color:#234627;margin-right:7px;font-weight:700}
#concrete13-page .c13-calculator{margin:38px 0 52px;border:1px solid var(--c13-border);border-radius:18px;overflow:hidden;background:#fff;box-shadow:0 12px 34px #23462705;scroll-margin-top:25px}
#concrete13-page .c13-tool-heading{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:26px 30px;border-bottom:1px solid var(--c13-border)}
#concrete13-page .c13-tool-heading h2{font-size:27px;line-height:1.25;letter-spacing:-.6px;margin:8px 0}
#concrete13-page .c13-tool-heading p{font-size:14px;color:#555}
#concrete13-page .c13-tag{font-size:11px;background:#edf4eb;border:1px solid #edf4eb;border-radius:30px;padding:7px 11px;white-space:nowrap}
#concrete13-page .c13-tool-grid{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(0,1fr)}
#concrete13-page .c13-input-panel{padding:26px 30px;min-width:0}
#concrete13-page .c13-step{display:flex;align-items:center;gap:10px;margin:0 0 20px}
#concrete13-page .c13-step:not(:first-child){margin-top:28px}
#concrete13-page .c13-step>span{display:inline-flex;align-items:center;justify-content:center;background:#234627;color:#fff;border-radius:50%;width:28px;height:28px;font-size:11px;flex-shrink:0}
#concrete13-page .c13-step h3{font-size:18px;line-height:1.4;font-weight:700}
#concrete13-page .c13-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:14px}
#concrete13-page .c13-wide{grid-column:1/-1}
#concrete13-page .c13-field{font-size:12px;font-weight:650;display:block;min-width:0;margin:0 0 16px;line-height:1.5}
#concrete13-page .c13-optional{font-size:10px;color:#666;font-weight:400}
#concrete13-page input,#concrete13-page select{font:400 16px/1.4 system-ui;color:#234627;background:#fff;border:1px solid #ccc;border-radius:7px;width:100%;min-width:0;max-width:100%;min-height:46px;padding:11px 12px;margin:7px 0 0;box-shadow:none}
#concrete13-page select{padding-right:27px}
#concrete13-page input:focus,#concrete13-page select:focus{outline:2px solid #234627;outline-offset:1px;border-color:#234627}
#concrete13-page .c13-input-unit{display:grid;grid-template-columns:minmax(0,1fr) 87px;gap:6px}
#concrete13-page .c13-input-unit select{font-size:13px;padding:10px 6px}
#concrete13-page .c13-help{display:block;font-size:11px;line-height:1.55;font-weight:400;color:#606060;margin-top:7px}
#concrete13-page .c13-unit-choice{display:flex;background:#f4f4f4;border-radius:8px;padding:4px;gap:4px;width:max-content;max-width:100%;margin-bottom:20px}
#concrete13-page button{font:600 13px/1.4 system-ui;cursor:pointer;min-height:44px;border-radius:7px;padding:11px 15px;border:1px solid transparent;box-shadow:none;transition:background .15s,color .15s;white-space:normal}
#concrete13-page .c13-unit-choice button{font-size:12px;background:transparent;color:#555;min-height:36px;padding:8px 19px}
#concrete13-page .c13-unit-choice button[aria-pressed="true"]{background:#fff;color:#234627;box-shadow:0 1px 4px #00000012}
#concrete13-page .c13-diagram{background:#fafafa;border-radius:9px;border:1px solid #eee;padding:12px;height:125px;display:flex;align-items:center;justify-content:center;margin-bottom:10px}
#concrete13-page .c13-diagram svg{max-height:105px;width:100%;height:100%}
#concrete13-page .c13-shape-help{min-height:34px;margin-bottom:15px}
#concrete13-page .c13-example-note{font-size:11px;color:#234627;margin:0 0 12px}
#concrete13-page .c13-add-row{display:flex;flex-wrap:wrap;align-items:center;gap:8px 14px}
#concrete13-page .c13-secondary{background:#fff;border-color:#ccc;color:#234627}
#concrete13-page .c13-secondary:hover{background:#f4f4f4;border-color:#234627}
#concrete13-page .c13-saved{display:grid;gap:10px;margin-top:16px}
#concrete13-page .c13-section-card{border:1px solid #ddd;border-radius:9px;padding:13px;font-size:12px;min-width:0}
#concrete13-page .c13-section-card strong{display:block;overflow-wrap:anywhere}
#concrete13-page .c13-section-card .c13-card-actions{display:flex;gap:5px;margin-top:8px}
#concrete13-page .c13-card-actions button{padding:6px 12px;background:#f7f7f7;border-color:#ddd;font-size:11px}
#concrete13-page .c13-density{border-top:1px solid #eee;border-bottom:1px solid #eee;margin:18px 0 0}
#concrete13-page .c13-yield-settings{border-top:1px solid #eee;border-bottom:1px solid #eee}
#concrete13-page summary{font-size:12px;font-weight:650;cursor:pointer;padding:15px 0;min-height:44px}
#concrete13-page .c13-product-note a{font-size:11px}
#concrete13-page .c13-actions{display:flex;gap:12px;align-items:center;margin-top:22px}
#concrete13-page .c13-primary{background:#234627;color:#fff;flex:1;min-height:50px;display:flex;justify-content:space-between;align-items:center;padding:13px 20px;font-size:14px}
#concrete13-page .c13-primary:hover{background:#333}
#concrete13-page .c13-primary span{color:#234627;font-size:20px}
#concrete13-page .c13-reset{background:transparent;color:#555;text-decoration:underline;text-underline-offset:3px;padding:10px}
#concrete13-page .c13-error{background:#edf4eb;border:1px solid #71916a;padding:12px;border-radius:8px;color:#234627;font-size:13px;margin-top:18px}
#concrete13-page .c13-result-panel{background:#f8f8f7;border-left:1px solid #ddd;padding:30px;min-width:0}
#concrete13-page .c13-result-panel h3{font-size:25px;line-height:1.3;letter-spacing:-.5px;margin:12px 0 23px}
#concrete13-page .c13-empty{padding:30px 0}
#concrete13-page .c13-empty svg{display:block;width:180px;margin:0 auto 25px}
#concrete13-page .c13-empty p{font-size:14px;color:#555}
#concrete13-page .c13-empty ul{padding-left:20px;font-size:12px;color:#555;margin-top:18px;line-height:2}
#concrete13-page .c13-result-main{background:#234627;color:#fff;border-radius:12px;padding:22px;margin-bottom:18px}
#concrete13-page .c13-result-main .c13-result-value{font-size:clamp(31px,3.5vw,45px);line-height:1.2;font-weight:750;overflow-wrap:anywhere;margin:10px 0}
#concrete13-page .c13-result-main small{font-size:12px;color:#e4e4e4;display:block}
#concrete13-page .c13-result-main .c13-unit{font-size:15px;font-weight:500;color:#234627}
#concrete13-page .c13-stat-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:10px;margin:12px 0 20px}
#concrete13-page .c13-stat{padding:15px;border:1px solid #ddd;border-radius:8px;background:#fff;min-width:0}
#concrete13-page .c13-stat small{font-size:11px;color:#555;display:block}
#concrete13-page .c13-stat strong{display:block;font-size:23px;line-height:1.4;overflow-wrap:anywhere}
#concrete13-page .c13-result-lines{margin:0;border-top:1px solid #ddd}
#concrete13-page .c13-result-lines>div{display:flex;gap:15px;justify-content:space-between;border-bottom:1px solid #ddd;padding:11px 0;font-size:12px}
#concrete13-page .c13-result-lines dt{color:#555}
#concrete13-page .c13-result-lines dd{margin:0;text-align:right;font-weight:650;overflow-wrap:anywhere;min-width:0}
#concrete13-page .c13-breakdown{margin-top:20px;font-size:12px}
#concrete13-page .c13-breakdown h4{font-size:13px;margin:0 0 10px}
#concrete13-page .c13-breakdown ul{padding-left:18px}
#concrete13-page .c13-breakdown li{margin:7px 0;overflow-wrap:anywhere}
#concrete13-page .c13-assumptions{font-size:11px;color:#555;border-left:3px solid #234627;padding-left:12px;margin-top:20px}
#concrete13-page .c13-export{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
#concrete13-page .c13-export button{font-size:11px}
#concrete13-page .c13-status{font-size:12px;color:#234627;margin-top:16px}
#concrete13-page .c13-result-help{font-size:11px;line-height:1.6;color:#666;margin-top:25px}
#concrete13-page .c13-copy-fallback{width:100%;min-height:180px;margin-top:15px;font:13px/1.6 system-ui;padding:12px;border:1px solid #aaa;border-radius:7px}
#concrete13-page .c13-reading{display:grid;grid-template-columns:minmax(0,780px) minmax(0,245px);gap:62px;align-items:start;padding-bottom:60px}
#concrete13-page .c13-article{min-width:0;font-size:17px;line-height:1.8}
#concrete13-page .c13-article h2{font-size:30px;letter-spacing:-.6px;line-height:1.25;margin:44px 0 18px;scroll-margin-top:24px}
#concrete13-page .c13-article h2:first-child{margin-top:0}
#concrete13-page .c13-article h3{font-size:21px;line-height:1.4;margin:25px 0 13px}
#concrete13-page .c13-article p{margin-bottom:17px;color:#333}
#concrete13-page .c13-article ul{padding-left:22px;margin:17px 0}
#concrete13-page .c13-article li{margin-bottom:10px;color:#333}
#concrete13-page .c13-article .note,#concrete13-page .c13-article .formula{background:#edf4eb;border-left:4px solid #234627;padding:19px 22px;border-radius:0 8px 8px 0;font-size:15px;overflow-wrap:anywhere}
#concrete13-page .c13-article figure{margin:25px 0;border:1px solid #ddd;border-radius:10px;padding:15px}
#concrete13-page .c13-article svg{max-width:100%;height:auto;display:block}
#concrete13-page figcaption{font-size:12px;color:#666;margin-top:10px}
#concrete13-page .table-wrap{max-width:100%;overflow:auto;margin:25px 0}
#concrete13-page table{border-collapse:collapse;width:100%;font-size:13px;line-height:1.6}
#concrete13-page th,#concrete13-page td{text-align:left;padding:14px;border-bottom:1px solid #ddd;vertical-align:top}
#concrete13-page th{background:#234627;color:#fff;font-weight:600}
#concrete13-page tbody tr:nth-child(even){background:#fafafa}
#concrete13-page caption{text-align:left;color:#666;font-size:12px;margin-bottom:10px}
#concrete13-page .c13-reading-nav{border:1px solid #ddd;border-radius:12px;padding:23px;position:sticky;top:25px;font-size:12px}
#concrete13-page .c13-reading-nav strong{font-size:14px}
#concrete13-page .c13-reading-nav ul{padding:0;list-style:none;display:grid;gap:14px;margin:17px 0 0}
#concrete13-page .c13-reading-nav a{text-decoration:none;color:#555}
#concrete13-page .c13-reading-nav a:hover{text-decoration:underline;color:#234627}
#concrete13-page .c13-related-note{border-top:1px solid #ddd;margin-top:22px;padding-top:20px;color:#555;font-size:12px}
#concrete13-page .c13-related-note a{display:block;margin-top:12px;text-decoration:underline;color:#234627}
#concrete13-page .muted{font-size:12px!important;color:#666!important;border-top:1px solid #ddd;padding-top:18px}
#concrete13-page .c13-notice{padding:20px}
@media(max-width:950px){#concrete13-page .c13-hero-grid{gap:30px}#concrete13-page .c13-reading{grid-template-columns:minmax(0,1fr);gap:20px}#concrete13-page .c13-reading-nav{grid-row:1;position:static}#concrete13-page .c13-reading-nav ul{display:grid;grid-template-columns:repeat(3,minmax(0,1fr))}#concrete13-page .c13-related-note{display:none}#concrete13-page .c13-tool-grid{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}#concrete13-page .c13-input-panel,#concrete13-page .c13-result-panel{padding:23px}}
@media(max-width:720px){#concrete13-page .c13-shell{padding:0 18px}#concrete13-page .c13-hero{padding:34px 0 28px}#concrete13-page .c13-hero-grid{grid-template-columns:minmax(0,1fr)}#concrete13-page .c13-hero-art{display:none}#concrete13-page h1{letter-spacing:-1px;font-size:39px}#concrete13-page .c13-hero p{font-size:15px}#concrete13-page .c13-trust-row{gap:7px 16px;font-size:11px}#concrete13-page .c13-calculator{margin:25px 0 32px;border-radius:12px}#concrete13-page .c13-tool-heading{padding:20px;display:block}#concrete13-page .c13-tool-heading h2{font-size:23px}#concrete13-page .c13-tag{display:none}#concrete13-page .c13-tool-grid{grid-template-columns:minmax(0,1fr)}#concrete13-page .c13-input-panel,#concrete13-page .c13-result-panel{padding:20px}#concrete13-page .c13-result-panel{border-left:0;border-top:1px solid #ddd}#concrete13-page .c13-result-panel h3{font-size:24px}#concrete13-page .c13-empty{padding:0}#concrete13-page .c13-empty svg,#concrete13-page .c13-empty ul{display:none}#concrete13-page .c13-empty p{font-size:13px}#concrete13-page .c13-reading-nav{padding:19px}#concrete13-page .c13-reading-nav ul{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}#concrete13-page .c13-article{font-size:16px;line-height:1.8}#concrete13-page .c13-article h2{font-size:26px;margin-top:35px}#concrete13-page .c13-article h3{font-size:20px}#concrete13-page .c13-article .formula,#concrete13-page .c13-article .note{padding:16px;font-size:14px}#concrete13-page th,#concrete13-page td{padding:10px}#concrete13-page .c13-input-unit{grid-template-columns:minmax(0,1fr) 77px}}
@media(max-width:420px){#concrete13-page .c13-shell{padding:0 12px}#concrete13-page h1{font-size:34px}#concrete13-page .c13-input-panel,#concrete13-page .c13-result-panel,#concrete13-page .c13-tool-heading{padding:16px}#concrete13-page .c13-grid{grid-template-columns:minmax(0,1fr);gap:0}#concrete13-page .c13-field{margin-bottom:15px}#concrete13-page .c13-input-unit{grid-template-columns:minmax(0,1fr) 96px}#concrete13-page .c13-add-row button{width:100%}#concrete13-page .c13-result-main{padding:18px}}
@media(prefers-reduced-motion:reduce){#concrete13-page button{transition:none}}
@media print{#concrete13-page .c13-hero,#concrete13-page .c13-tool-heading,#concrete13-page .c13-input-panel,#concrete13-page .c13-reading,#concrete13-page .c13-export,#concrete13-page .c13-copy-fallback{display:none!important}#concrete13-page .c13-shell{padding:0;max-width:none}#concrete13-page .c13-calculator{margin:0;box-shadow:none;border:0}#concrete13-page .c13-tool-grid{display:block}#concrete13-page .c13-result-panel{border:0;background:#fff;padding:10px}#concrete13-page .c13-result-main{background:#fff;color:#234627;border:1px solid #234627}#concrete13-page .c13-result-main small,#concrete13-page .c13-result-main .c13-unit{color:#234627}}

/* Cost-page refinements: every selector stays inside the page. */
#concrete13-page .c13-tool-heading{display:block}
#concrete13-page .c13-tool-grid{grid-template-columns:minmax(0,1.25fr) minmax(0,.9fr);align-items:start}
#concrete13-page .c13-result-panel{align-self:stretch}
#concrete13-page .c13-input-unit{grid-template-columns:minmax(0,1fr) 106px}
#concrete13-page .c13-detail{border-top:1px solid #ddd;margin-top:12px}
#concrete13-page .c13-detail summary{font-size:13px;line-height:1.6;padding:16px 0}
#concrete13-page summary>span{font-size:10px;color:#666;font-weight:400;margin-left:8px}
#concrete13-page .c13-detail>p{margin-bottom:13px}
#concrete13-page .c13-cost-row{padding:14px 0;border-top:1px solid #e4e4e4}
#concrete13-page .c13-row-top{display:grid;grid-template-columns:minmax(0,.8fr) minmax(0,1fr);gap:12px;align-items:center}
#concrete13-page .c13-row-top strong{font-size:13px;line-height:1.4}
#concrete13-page .c13-row-top select{margin:0;font-size:14px}
#concrete13-page .c13-row-values{padding:14px 0 0}
#concrete13-page .c13-check{display:flex;gap:10px;align-items:flex-start;font-size:12px;line-height:1.6;margin:12px 0;color:#333}
#concrete13-page input[type=checkbox]{width:20px;min-width:20px;height:20px;min-height:20px;margin:0;accent-color:#234627;flex-shrink:0}
#concrete13-page .c13-note{background:#edf4eb;border-left:3px solid #234627;padding:14px;font-size:12px;line-height:1.7;margin:14px 0}
#concrete13-page .c13-empty-art{width:170px;margin:10px auto 25px;border:1px solid #ddd;border-radius:15px;padding:20px;background:#fff;transform:rotate(-3deg)}
#concrete13-page .c13-empty-art span{font-size:42px;font-weight:750;line-height:1.2}
#concrete13-page .c13-empty-art div{height:7px;border-radius:4px;background:#eee;margin-top:13px}
#concrete13-page .c13-empty-art div:last-child{width:70%;background:#234627}
#concrete13-page .c13-unknown{padding:16px;background:#edf4eb;border-radius:9px;margin-top:20px;font-size:12px;line-height:1.6;border:1px solid #edf4eb}
#concrete13-page .c13-unknown p{margin:7px 0}
#concrete13-page .c13-unknown ul{padding-left:18px;columns:2;column-gap:18px}
#concrete13-page .c13-unknown li{break-inside:avoid}
#concrete13-page .c13-confirmed{font-size:12px;padding:15px 0;color:#444}
#concrete13-page .c13-result-detail{margin-top:15px}
#concrete13-page .c13-quote-comparison{border-top:1px solid #ddd;padding:3px 30px 18px;background:#fafafa}
#concrete13-page .c13-quote-comparison .c13-detail{border:0;margin:0}
#concrete13-page .c13-comparison-result{font-size:14px;margin-top:14px;font-weight:600}
#concrete13-page .c13-article ol{padding-left:24px;margin:17px 0}
#concrete13-page .c13-article .table-wrap{border:1px solid #ddd;border-radius:9px}
#concrete13-page .c13-article details{border-bottom:1px solid #ddd;padding:4px 0}
#concrete13-page .c13-article details summary{font-size:17px}
#concrete13-page .c13-article details p{margin-top:12px}
#concrete13-page .c13-reading-nav a{min-height:28px;display:inline-block}
#concrete13-page .c13-unit-choice button{min-height:44px}
#concrete13-page .c13-result-lines dt{min-width:0;flex:1;overflow-wrap:anywhere}
#concrete13-page .c13-result-lines dd{max-width:48%}
@media(max-width:950px){#concrete13-page .c13-tool-grid{grid-template-columns:minmax(0,1fr) minmax(0,.85fr)}#concrete13-page .c13-row-top{grid-template-columns:minmax(0,1fr);gap:8px}#concrete13-page .c13-tool-grid .c13-grid{grid-template-columns:minmax(0,1fr);gap:0}}
@media(max-width:720px){#concrete13-page .c13-tool-grid{grid-template-columns:minmax(0,1fr)}#concrete13-page .c13-tool-grid .c13-grid{grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:14px}#concrete13-page .c13-row-top{grid-template-columns:minmax(0,.7fr) minmax(0,1fr)}#concrete13-page .c13-empty-art{display:none}#concrete13-page .c13-quote-comparison{padding:3px 20px 15px}#concrete13-page .c13-hero p:nth-of-type(3){font-size:13px}#concrete13-page .c13-unknown ul{columns:1}}
@media(max-width:420px){#concrete13-page .c13-tool-grid .c13-grid{grid-template-columns:minmax(0,1fr);gap:0}#concrete13-page .c13-row-top{grid-template-columns:minmax(0,1fr);gap:8px}#concrete13-page .c13-quote-comparison{padding:3px 16px 15px}#concrete13-page .c13-input-unit{grid-template-columns:minmax(0,1fr) 101px}#concrete13-page .c13-export{display:grid;grid-template-columns:minmax(0,1fr)}#concrete13-page .c13-export button{font-size:12px}#concrete13-page .c13-stat-grid{grid-template-columns:minmax(0,1fr)}}
@media print{#concrete13-page .c13-quote-comparison,#concrete13-page .c13-status,#concrete13-page .c13-empty{display:none!important}#concrete13-page .c13-tool-grid{display:block}#concrete13-page .c13-result-panel{break-inside:avoid}#concrete13-page .c13-result-detail{display:none}#concrete13-page .c13-unknown{background:#fff;border:1px solid #234627}}