:root{--bg:#f6f8fb;--surface:#fff;--ink:#10233f;--muted:#66758a;--line:#dfe7f1;--blue:#246bfd;--blue2:#164fc8;--soft:#eef4ff;--green:#188a58;--amber:#9a6410;--shadow:0 16px 38px rgba(20,48,85,.08);--r:18px;--nav:74px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.55;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}button,input,select{font:inherit}button{cursor:pointer}.container{width:min(1180px,calc(100% - 36px));margin:auto}.skip{position:absolute;left:-999px;top:0}.skip:focus{left:12px;top:12px;z-index:99;background:#fff;padding:9px 12px;border-radius:8px}
.nav{height:var(--nav);position:sticky;top:0;z-index:60;background:rgba(255,255,255,.93);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}.nav-inner{height:100%;display:flex;align-items:center;gap:28px}.brand{display:flex;align-items:center;gap:10px;font-size:21px;font-weight:850;letter-spacing:-.02em}.brand svg{width:34px;height:34px}.nav-links{display:flex;gap:24px;font-size:14px;color:#32465f}.nav-links a:hover,.nav-links a[aria-current="page"]{color:var(--blue)}.nav-spacer{flex:1}.nav-cta{background:var(--blue);color:#fff;padding:10px 15px;border-radius:10px;font-weight:780;font-size:14px}.nav-cta:hover{background:var(--blue2)}.mobile-menu{display:none;background:#fff;border:1px solid var(--line);border-radius:10px;padding:8px 10px}.mobile-drawer{display:none}
.hero{padding:70px 0 42px;background:radial-gradient(circle at 80% 15%,#e7f0ff 0,transparent 34%)}.hero-grid{display:grid;grid-template-columns:1.08fr .92fr;gap:48px;align-items:center}.eyebrow{font-size:12px;text-transform:uppercase;letter-spacing:.11em;color:var(--blue);font-weight:850}.hero h1{font-size:58px;line-height:1.01;letter-spacing:-.045em;margin:12px 0 20px;max-width:760px}.hero p.lead{font-size:19px;color:var(--muted);max-width:700px;margin:0}.actions{display:flex;gap:12px;flex-wrap:wrap;margin:28px 0 24px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:11px;padding:12px 17px;border:1px solid transparent;font-weight:800}.btn-primary{background:var(--blue);color:#fff}.btn-primary:hover{background:var(--blue2)}.btn-secondary{background:#fff;border-color:#a9c2ff;color:var(--blue)}.btn-light{background:#f2f5f9;border-color:var(--line);color:#344a65}.proof{display:flex;gap:18px;flex-wrap:wrap;color:#40536b;font-size:13px}.proof span:before{content:'✓';color:var(--green);font-weight:900;margin-right:6px}.hero-card{min-height:390px;border:1px solid var(--line);background:#fff;border-radius:24px;box-shadow:var(--shadow);padding:24px;position:relative;overflow:hidden}.hero-card:before{content:'';position:absolute;inset:0;background:linear-gradient(145deg,#eef4ff 0,#fff 52%,#f2f7fd 100%)}.project-visual{position:relative;z-index:1;height:245px;border-radius:18px;border:1px solid #cbd8e6;background:linear-gradient(165deg,#fafdff,#e5edf6);overflow:hidden}.house{position:absolute;left:15%;right:15%;bottom:12%;height:53%;background:#fff;border:1px solid #aebed0;clip-path:polygon(0 22%,50% 0,100% 22%,100% 100%,0 100%)}.door{position:absolute;left:47%;bottom:12%;width:13%;height:27%;background:#bccce0;border:1px solid #93a9c0}.window{position:absolute;width:14%;height:13%;bottom:33%;background:#dcebfa;border:1px solid #91aaca}.w1{left:28%}.w2{right:24%}.measure-line{position:absolute;bottom:6%;left:18%;right:18%;border-top:2px solid var(--blue)}.measure-line:before,.measure-line:after{content:'';position:absolute;top:-5px;width:8px;height:8px;border-top:2px solid var(--blue);border-left:2px solid var(--blue);transform:rotate(-45deg)}.measure-line:before{left:0}.measure-line:after{right:0;transform:rotate(135deg)}.visual-copy{position:relative;z-index:1;padding-top:18px}.visual-copy strong{font-size:20px;display:block}.visual-copy p{margin:6px 0 0;color:var(--muted);font-size:14px}
.section{padding:42px 0}.section.white{background:#fff;border-top:1px solid #edf1f5;border-bottom:1px solid #edf1f5}.section-head{display:flex;justify-content:space-between;align-items:end;gap:22px;margin-bottom:20px}.section h2{font-size:32px;line-height:1.15;letter-spacing:-.025em;margin:0 0 7px}.sub{color:var(--muted);margin:0}.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:21px;box-shadow:0 8px 24px rgba(30,52,88,.045)}.tool-card{transition:transform .18s,box-shadow .18s}.tool-card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}.icon{width:46px;height:46px;border-radius:12px;background:var(--soft);display:grid;place-items:center;color:var(--blue);font-weight:900}.icon svg{width:25px;height:25px}.card h3{margin:15px 0 8px;font-size:18px}.card p{color:var(--muted);font-size:14px;margin:0 0 15px}.link{color:var(--blue);font-weight:780;font-size:14px}.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.step{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px}.step .n{width:30px;height:30px;border-radius:50%;display:grid;place-items:center;background:var(--soft);color:var(--blue);font-weight:850;margin-bottom:12px}.step strong{display:block;margin-bottom:5px}.step p{margin:0;color:var(--muted);font-size:13px}.trust{display:grid;grid-template-columns:1fr 1fr;gap:22px;align-items:center}.trust-list{display:grid;grid-template-columns:1fr 1fr;gap:12px}.trust-item{background:#f8fafc;border:1px solid var(--line);border-radius:13px;padding:15px}.trust-item strong{display:block}.trust-item span{color:var(--muted);font-size:12px}
.page-hero{padding:38px 0 18px}.breadcrumbs{font-size:12px;color:#8391a4;margin-bottom:14px}.page-hero h1{font-size:42px;letter-spacing:-.035em;margin:0 0 8px;line-height:1.08}.page-hero p{margin:0;color:var(--muted);max-width:820px}.badges{display:flex;gap:12px;flex-wrap:wrap;margin-top:18px}.badge{font-size:12px;color:#435770;display:flex;align-items:center;gap:6px}.badge i{display:inline-grid;place-items:center;width:20px;height:20px;border-radius:6px;background:var(--soft);color:var(--blue);font-style:normal;font-weight:900}
.calc-shell{display:grid;grid-template-columns:1.05fr .95fr;gap:18px;align-items:start}.panel{background:#fff;border:1px solid var(--line);border-radius:16px;padding:22px;box-shadow:0 9px 26px rgba(30,52,88,.05)}.panel h2,.panel h3{margin-top:0}.step-title{display:flex;gap:10px;align-items:center;font-size:17px;margin:0 0 14px}.step-title .num{width:28px;height:28px;border-radius:50%;background:var(--soft);color:var(--blue);display:grid;place-items:center;font-weight:850}.seg{display:flex;flex-wrap:wrap;gap:8px}.seg button{border:1px solid var(--line);background:#f8fafc;color:#34485f;padding:10px 13px;border-radius:10px;font-weight:760}.seg button.active{background:var(--blue);color:#fff;border-color:var(--blue)}.form-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:13px}.form-grid.two{grid-template-columns:repeat(2,1fr)}.field label{display:block;font-size:12px;color:#5d6e83;font-weight:760;margin-bottom:6px}.field input,.field select{width:100%;border:1px solid var(--line);border-radius:10px;padding:11px 12px;background:#fff;color:var(--ink);outline:0}.field input:focus,.field select:focus{border-color:#83a9ff;box-shadow:0 0 0 3px #edf3ff}.with-unit{display:flex}.with-unit input{border-radius:10px 0 0 10px}.with-unit select{width:82px;border-left:0;border-radius:0 10px 10px 0;background:#f8fafc}.check{display:flex;align-items:center;gap:9px;margin-top:25px;font-size:13px;color:#3e536c}.check input{width:17px;height:17px}.divider{height:1px;background:var(--line);margin:22px 0}.calc-actions{display:flex;gap:10px;margin-top:18px}.calc-actions .btn-primary{flex:1}.notice{padding:13px 15px;border-radius:11px;background:#fff8e8;border:1px solid #f2d48b;color:#775715;font-size:12px;margin-top:13px}.preview{background:linear-gradient(160deg,#fafdff,#edf3f9);border:1px solid var(--line);border-radius:14px;padding:17px}.preview-head{display:flex;justify-content:space-between;gap:10px;align-items:center}.preview-head strong{font-size:15px}.shape-wrap{height:210px;display:grid;place-items:center;position:relative}.slab{width:67%;height:105px;background:linear-gradient(145deg,#d6dde5,#adb7c2);transform:skewY(-8deg);box-shadow:13px 15px 19px rgba(30,52,88,.13);position:relative}.wallshape{width:70%;height:135px;background:linear-gradient(145deg,#d8dee5,#abb6c1);box-shadow:11px 13px 17px rgba(30,52,88,.12);position:relative}.columnshape{width:100px;height:140px;border-radius:50%/14%;background:linear-gradient(90deg,#b7c2ce,#e0e6ec 45%,#aab6c1);box-shadow:10px 12px 18px rgba(30,52,88,.13);position:relative}.columnshape:before{content:'';position:absolute;left:0;right:0;top:-8px;height:20px;border-radius:50%;background:#dce3ea;border:1px solid #a9b5c0}.dim{position:absolute;font-size:11px;font-weight:800;color:#31465f;white-space:nowrap}.dim.top{top:-25px;left:42%}.dim.left{left:-52px;top:45%}.dim.right{right:-47px;top:45%}.result{margin-top:14px}.result-row{display:flex;justify-content:space-between;align-items:flex-start;gap:20px;padding:11px 0;border-bottom:1px solid #edf1f6}.result-row:last-child{border:0}.result-row span{color:#56677c;font-size:13px}.result-row strong{font-size:17px;text-align:right}.result-row.hero-result{background:#edf4ff;margin:0 -9px;padding:13px 9px;border-radius:9px;border:0}.result-row.hero-result strong{font-size:22px}.result-note{font-size:11px;color:#8492a4;margin-top:10px}.copy{border:1px solid var(--line);background:#fff;color:var(--blue);padding:7px 9px;border-radius:8px;font-size:12px;font-weight:750}.info-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}.prose{color:#4e6075}.prose h2{color:var(--ink);font-size:26px;margin:0 0 10px}.prose h3{color:var(--ink);font-size:18px;margin:22px 0 7px}.prose p,.prose li{font-size:14px}.formula{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;background:#f5f8fb;border:1px solid var(--line);padding:12px 14px;border-radius:10px;color:#34495f}.faq details{border-top:1px solid var(--line);padding:13px 0}.faq details:first-child{border-top:0}.faq summary{font-weight:740;cursor:pointer;font-size:14px}.faq p{color:var(--muted);font-size:13px}.related{display:grid;grid-template-columns:repeat(3,1fr);gap:13px}.related a{background:#fff;border:1px solid var(--line);border-radius:13px;padding:15px}.related strong{display:block;font-size:14px}.related span{font-size:12px;color:var(--muted)}
.directory{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.directory .card{min-height:175px}.searchbox{display:flex;gap:10px;margin:18px 0 20px}.searchbox input{width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:11px;background:#fff}.chips{display:flex;gap:8px;flex-wrap:wrap}.chip{border:1px solid var(--line);background:#fff;padding:8px 11px;border-radius:999px;font-size:12px;font-weight:740}.chip.active{background:var(--blue);color:#fff;border-color:var(--blue)}.coming{opacity:.62}.coming .link{color:#8190a3}.empty{display:none;text-align:center;padding:35px;color:var(--muted)}
.content{max-width:850px}.content h1{font-size:42px;letter-spacing:-.035em}.content h2{font-size:25px;margin:31px 0 9px}.content p,.content li{color:#506277}.content a{color:var(--blue);text-decoration:underline}.contact-grid{display:grid;grid-template-columns:.8fr 1.2fr;gap:18px}.contact-card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:22px}.contact-form{display:grid;gap:12px}.contact-form label{font-size:12px;font-weight:750}.contact-form input,.contact-form textarea,.contact-form select{width:100%;padding:11px 12px;border:1px solid var(--line);border-radius:10px;background:#fff}.contact-form textarea{min-height:135px;resize:vertical}.small{font-size:12px;color:var(--muted)}
.footer{margin-top:56px;background:#0d223c;color:#c9d4e1}.footer-inner{padding:36px 0;display:grid;grid-template-columns:1fr auto;gap:24px}.footer .brand{color:#fff}.footer-copy{font-size:12px;color:#8fa1b7;margin-top:9px;max-width:560px}.footer-links{display:grid;grid-template-columns:repeat(2,auto);gap:8px 22px;font-size:13px}.footer-links a:hover{color:#fff}
@media(max-width:940px){.nav-links{display:none}.mobile-menu{display:block}.nav-cta{display:none}.mobile-drawer.open{display:block;position:fixed;top:var(--nav);left:0;right:0;background:#fff;border-bottom:1px solid var(--line);padding:15px 18px;z-index:55}.mobile-drawer a{display:block;padding:10px 0}.hero-grid,.calc-shell,.trust,.contact-grid{grid-template-columns:1fr}.hero h1{font-size:48px}.grid3,.directory{grid-template-columns:repeat(2,1fr)}.steps{grid-template-columns:repeat(2,1fr)}.hero-card{min-height:350px}.footer-inner{grid-template-columns:1fr}.footer-links{justify-content:start}.info-grid{grid-template-columns:1fr}}
@media(max-width:620px){.container{width:min(100% - 24px,1180px)}.hero{padding-top:42px}.hero h1{font-size:39px}.page-hero h1,.content h1{font-size:34px}.grid3,.directory,.steps,.related,.trust-list,.form-grid,.form-grid.two{grid-template-columns:1fr}.actions{flex-direction:column}.actions .btn{width:100%}.panel{padding:16px}.shape-wrap{height:180px}.footer-links{grid-template-columns:1fr 1fr}.proof{gap:10px 14px}.section{padding:34px 0}}

/* Concrete v0.2 decision-support results */
.result-panel{overflow:hidden}.estimate-hero{margin-top:16px;padding:18px 18px 16px;border-radius:14px;background:linear-gradient(135deg,#edf4ff,#f8fbff);border:1px solid #d7e5ff}.estimate-kicker{display:block;color:#55708f;font-size:12px;font-weight:800;text-transform:uppercase;letter-spacing:.07em}.estimate-hero strong{display:block;font-size:34px;line-height:1.1;margin:5px 0 3px;letter-spacing:-.035em}.estimate-hero>span:last-child{display:block;color:#61748b;font-size:12px}.volume-pair{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:12px}.volume-pair>div{border:1px solid var(--line);background:#fff;border-radius:11px;padding:12px}.volume-pair span{display:block;color:#708096;font-size:11px;margin-bottom:2px}.volume-pair strong{font-size:16px}.unit-line{margin-top:9px;color:#63758c;font-size:12px;text-align:center}.decision-alert{display:grid;gap:3px;margin-top:14px;padding:13px 14px;border-radius:12px;border:1px solid var(--line);background:#f8fafc}.decision-alert strong{font-size:14px}.decision-alert span{font-size:12px;color:#5f7187}.decision-alert.large{background:#fff7e8;border-color:#f2d08a}.decision-alert.large strong{color:#81540b}.decision-alert.small-project{background:#effaf4;border-color:#bfe4cf}.decision-alert.small-project strong{color:#126c45}.decision-alert.compare{background:#f3f7ff;border-color:#cadbff}.decision-alert.compare strong{color:#1b55c5}.buy-heading{display:flex;justify-content:space-between;align-items:end;gap:10px;margin:19px 0 10px}.buy-heading span{font-weight:850;font-size:16px}.buy-heading small{color:#8190a4;font-size:10px}.buy-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}.buy-card{border:1px solid var(--line);border-radius:13px;padding:14px;background:#fff;min-height:205px}.buy-card.recommended{border-color:#8db0ff;box-shadow:0 0 0 2px #edf3ff inset;background:#fbfdff}.buy-card-head{display:flex;justify-content:space-between;align-items:flex-start;gap:8px}.buy-card-head strong{font-size:13px}.option-badge{min-height:20px;font-size:9px;font-weight:850;color:#fff;background:var(--blue);padding:3px 6px;border-radius:999px}.option-badge:empty{display:none}.option-primary{font-size:20px;font-weight:900;letter-spacing:-.025em;margin:12px 0 7px}.buy-card p{font-size:11px;color:#65768b;margin:0 0 12px;line-height:1.45}.option-cost{font-size:11px;font-weight:760;color:#38506e;border-top:1px solid #edf1f6;padding-top:10px}.smart-check{display:grid;gap:2px;margin-top:12px;padding:11px 13px;border-radius:11px;font-size:11px}.smart-check strong{font-size:12px}.smart-check span{color:#66778b}.smart-check.ok{background:#f2faf6;border:1px solid #cae8d7}.smart-check.ok strong{color:#16734b}.smart-check.warn{background:#fff6e7;border:1px solid #f0cf8a}.smart-check.warn strong{color:#8a590b}.preview .slab,.preview .wallshape,.preview .columnshape{transition:width .22s ease,height .22s ease}.shape-wrap{overflow:visible}.dim.top{left:50%;transform:translateX(-50%)}
@media(max-width:620px){.volume-pair,.buy-grid{grid-template-columns:1fr}.buy-heading{align-items:flex-start;flex-direction:column}.estimate-hero strong{font-size:30px}.shape-wrap{overflow:hidden}.dim.left{left:-42px}.dim.right{right:-40px}}

/* v0.2.1 mobile preview fix: keep dimension labels inside the preview card */
@media(max-width:620px){
  .shape-wrap{
    height:220px;
    padding:36px 54px 28px;
    box-sizing:border-box;
    overflow:hidden;
  }
  .shape-wrap .slab,
  .shape-wrap .wallshape,
  .shape-wrap .columnshape{
    max-width:100%;
    max-height:100%;
  }
  .dim.top{top:-26px}
  .dim.left{left:-44px}
  .dim.right{right:-44px}
}


/* v0.3 — mobile-first production polish */
html,body{max-width:100%;overflow-x:hidden}.calc-shell>* ,.info-grid>* ,.panel,.field,.with-unit{min-width:0}.formula{white-space:normal;overflow-wrap:anywhere;word-break:break-word}.preview-caption{display:none}

@media(max-width:620px){
  :root{--nav:64px}
  body{background:#f4f7fb}
  .container{width:calc(100% - 28px);max-width:none}
  .nav{height:64px;background:rgba(255,255,255,.97)}
  .nav-inner{gap:12px}
  .brand{font-size:18px;gap:8px;white-space:nowrap}
  .brand svg{width:32px;height:32px;flex:none}
  .mobile-menu{min-height:42px;padding:8px 12px;border-radius:12px;font-weight:760;color:#246bfd;background:#fff}
  .mobile-drawer.open{top:64px;padding:10px 14px 16px;box-shadow:0 12px 28px rgba(20,48,85,.09)}
  .mobile-drawer a{padding:12px 6px;border-bottom:1px solid #eef2f6}

  .page-hero{padding:24px 0 12px}
  .breadcrumbs{display:none}
  .page-hero h1,.content h1{font-size:30px;line-height:1.04;margin-bottom:9px;letter-spacing:-.035em}
  .page-hero p{font-size:14px;line-height:1.55}
  .badges{display:flex;flex-wrap:nowrap;overflow-x:auto;gap:7px;margin:14px 0 0;padding:0 0 4px;scrollbar-width:none;scroll-snap-type:x proximity}
  .badges::-webkit-scrollbar{display:none}
  .badge{flex:0 0 auto;background:#fff;border:1px solid var(--line);border-radius:999px;padding:7px 10px;font-size:11px;scroll-snap-align:start}
  .badge i{width:17px;height:17px;border-radius:5px}

  .section{padding:16px 0}
  .section.white{padding:16px 0;background:#f4f7fb;border:0}
  .calc-shell{gap:12px}
  .panel{padding:16px;border-radius:16px;box-shadow:0 7px 22px rgba(30,52,88,.045)}
  .step-title{font-size:16px;margin-bottom:12px}
  .step-title .num{width:26px;height:26px;font-size:13px}
  .divider{margin:17px 0}

  .seg{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}
  .seg button{min-height:45px;padding:10px 8px;width:100%;font-size:14px}

  .field label{font-size:11px;margin-bottom:5px}
  .field input,.field select{min-height:46px;padding:10px 11px;font-size:16px}
  .with-unit select{width:68px;flex:none;font-size:15px}

  /* Concrete: two-column mobile entry with the 3rd dimension full width */
  #concrete-form .form-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
  #concrete-form #c-field-3{grid-column:1/-1}
  #concrete-form .form-grid.two{grid-template-columns:repeat(2,minmax(0,1fr))}

  /* Paint: keep common paired inputs together */
  #paint-form .form-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
  #paint-form .form-grid:first-of-type .field:nth-child(3){grid-column:1/-1}
  #paint-form .check{grid-column:1/-1;margin-top:4px;min-height:42px}

  /* Flooring: dimensions side-by-side, optional price gets full row */
  #floor-form .form-grid.two{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
  #floor-form .form-grid:not(.two){grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
  #floor-form .form-grid:not(.two) .field:nth-child(3){grid-column:1/-1}

  .calc-actions{gap:8px;margin-top:16px}
  .calc-actions .btn{min-height:48px;padding:11px 14px}
  .calc-actions .btn-light{flex:0 0 auto}
  .notice{font-size:11px;line-height:1.5;padding:12px 13px;margin-top:12px}
  .smart-check{padding:11px 12px}

  /* Results first on phones; visual preview becomes supporting context. */
  .calc-shell>div>.panel{display:flex;flex-direction:column}
  .calc-shell>div>.panel>.result{order:1;margin-top:0}
  .calc-shell>div>.panel>.preview{order:2;margin-top:14px}
  .calc-shell>div>.panel>.copy{order:3;align-self:flex-start;margin-top:10px}
  .calc-shell>div>.panel>.result-note{order:4}
  .estimate-hero{margin-top:0;padding:15px 16px}
  .estimate-hero strong{font-size:31px}
  .volume-pair{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}
  .volume-pair>div{padding:10px}
  .volume-pair strong{font-size:15px}
  .unit-line{text-align:left;margin:8px 1px 0}
  .decision-alert{padding:12px;margin-top:12px}
  .buy-heading{margin:16px 0 9px;display:block}
  .buy-heading small{display:block;margin-top:2px}

  /* Purchase choices use a swipeable card rail instead of a tall stack. */
  .buy-grid{display:flex;gap:10px;overflow-x:auto;padding:1px 1px 7px;margin-right:-16px;padding-right:16px;scroll-snap-type:x mandatory;scrollbar-width:none}
  .buy-grid::-webkit-scrollbar{display:none}
  .buy-card{flex:0 0 86%;min-height:170px;scroll-snap-align:start;padding:13px}
  .option-primary{font-size:19px;margin:10px 0 6px}

  /* Cleaner mobile preview: labels become one readable caption below the visual. */
  .preview{padding:14px;border-radius:13px}
  .preview-head strong{font-size:14px}
  .preview-head .small{font-size:10px}
  .shape-wrap{height:150px;padding:14px 18px;overflow:hidden}
  .shape-wrap .slab,.shape-wrap .wallshape{max-width:72%!important;max-height:108px!important}
  .shape-wrap .columnshape{max-height:112px!important}
  .dim{display:none!important}
  .preview-caption{display:block;margin-top:5px;padding-top:9px;border-top:1px solid #dfe7f1;text-align:center;color:#4d627a;font-size:12px;font-weight:760}

  /* Supporting SEO content reads like mobile cards rather than desktop columns. */
  .info-grid{gap:12px}
  .prose h2,.faq h2{font-size:22px;line-height:1.08;margin-bottom:9px}
  .prose h3{font-size:15px;margin:18px 0 6px}
  .prose p,.prose li{font-size:13px;line-height:1.55}
  .formula{font-size:12px;padding:10px 11px}
  .faq details{padding:13px 0}
  .faq summary{font-size:13px;line-height:1.35;padding-right:4px}
  .faq p{font-size:12px;line-height:1.5}

  .section-head{margin-bottom:12px}
  .section h2{font-size:24px}
  .related{display:flex;overflow-x:auto;gap:10px;margin-right:-14px;padding-right:14px;scroll-snap-type:x mandatory;scrollbar-width:none}
  .related::-webkit-scrollbar{display:none}
  .related a{flex:0 0 78%;scroll-snap-align:start;padding:14px}

  .footer{margin-top:28px}
  .footer-inner{padding:26px 0;gap:18px}
  .footer-copy{font-size:11px;line-height:1.5}
  .footer-links{grid-template-columns:1fr 1fr;gap:11px 18px;font-size:12px}
}

@media(max-width:370px){
  .container{width:calc(100% - 20px)}
  .brand{font-size:17px}
  #concrete-form .form-grid,#concrete-form .form-grid.two,#paint-form .form-grid,#floor-form .form-grid.two,#floor-form .form-grid:not(.two){grid-template-columns:1fr}
  #concrete-form #c-field-3,#paint-form .form-grid:first-of-type .field:nth-child(3),#paint-form .check,#floor-form .form-grid:not(.two) .field:nth-child(3){grid-column:auto}
  .volume-pair{grid-template-columns:1fr}
  .buy-card{flex-basis:92%}
}