:root{--ink:#182931;--navy:#122936;--teal:#4e8581;--surface:#f7f7f4;--paper:#fff;--line:#dce4e1;--muted:#607075;--warm:#c98a58;--soft-teal:#eaf3f1;--soft-warm:#fbf2e7;--radius:12px;--shadow:0 12px 36px rgba(18,41,54,.07)}
/* Layout safety overrides: intrinsic content must not widen a grid. */
.hero-grid{grid-template-columns:minmax(0,1.12fr) minmax(0,.88fr)}.guide-layout{grid-template-columns:minmax(0,1fr) 300px}.product-list{grid-template-columns:repeat(2,minmax(0,1fr))}.detail-grid{grid-template-columns:minmax(0,1fr) minmax(0,.9fr)}.product-card,.card-content,.decision-panel{min-width:0}.facts{grid-template-columns:repeat(2,minmax(0,1fr))}.fit-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.fact,.source-block li{overflow-wrap:anywhere}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--surface);color:var(--ink);font:16px/1.55 Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif}a{color:inherit;text-decoration-thickness:1px;text-underline-offset:3px}button{font:inherit}button:focus-visible,a:focus-visible{outline:3px solid var(--teal);outline-offset:3px}.site-header{background:rgba(255,255,255,.94);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:4;backdrop-filter:blur(10px)}.nav{max-width:1180px;padding:16px 32px;margin:auto;display:flex;align-items:center;justify-content:space-between;gap:20px}.brand{font-size:18px;font-weight:850;letter-spacing:.075em;text-decoration:none}.brand span{color:var(--teal)}.nav-links{display:flex;gap:24px;align-items:center;font-size:14px;font-weight:650}.nav-links a{text-decoration:none}.nav-links a[aria-current="page"]{color:var(--teal)}.menu{display:none;border:1px solid var(--line);background:#fff;color:var(--ink);border-radius:8px;padding:8px 11px}.container{max-width:1180px;margin:auto;padding:0 32px}.eyebrow{font-size:12px;line-height:1.2;text-transform:uppercase;letter-spacing:.11em;font-weight:800;color:var(--teal)}h1,h2,h3{font-family:Georgia,"Times New Roman",serif;font-weight:500;letter-spacing:-.035em;line-height:1.08}h1{font-size:clamp(44px,6.3vw,76px);max-width:780px;margin:14px 0 20px}h2{font-size:clamp(30px,4vw,46px);margin:0 0 12px}h3{font-size:23px;margin:0 0 8px}.lead{font-size:19px;max-width:620px;color:#405358}.button{display:inline-flex;justify-content:center;align-items:center;min-height:48px;padding:11px 17px;border-radius:8px;text-decoration:none;font-weight:750;border:1px solid transparent;cursor:pointer}.button.primary{background:var(--navy);color:#fff}.button.secondary{background:transparent;border-color:var(--ink);color:var(--ink)}.button.demo{background:#dfe8e5;color:#46585b;border:1px dashed #8ca7a3;cursor:not-allowed}.notice{border-left:3px solid var(--teal);background:var(--soft-teal);padding:14px 16px;margin:24px 0;color:#29494a}.notice.warm{border-color:var(--warm);background:var(--soft-warm);color:#60461f}.hero{padding:82px 0 58px;overflow:hidden}.hero-grid{display:grid;grid-template-columns:1.12fr .88fr;gap:48px;align-items:end}.hero-art{min-height:390px;border-radius:16px;background:linear-gradient(145deg,#e7eee9,#dbe8e2);position:relative;overflow:hidden;border:1px solid #cfdfd8}.hero-art:before,.hero-art:after{content:"";position:absolute;border-radius:50%;background:#779d8b}.hero-art:before{width:420px;height:420px;right:-120px;bottom:-190px}.hero-art:after{width:230px;height:230px;left:-75px;top:-90px;background:#bfd3c7}.sun{position:absolute;right:29%;top:23%;width:80px;height:80px;border:2px solid var(--warm);border-radius:50%;background:#f8e6c8}.ridge{position:absolute;bottom:0;left:-3%;width:106%;height:48%;background:var(--navy);clip-path:polygon(0 70%,24% 34%,47% 60%,67% 18%,100% 58%,100% 100%,0 100%)}.hero-caption{position:absolute;left:30px;bottom:24px;color:#fff;font-family:Georgia,serif;font-size:20px;max-width:230px}.section{padding:72px 0}.section.alt{background:var(--paper);border-block:1px solid var(--line)}.section-header{display:flex;justify-content:space-between;gap:24px;align-items:end;margin-bottom:28px}.section-header p{max-width:520px;color:var(--muted);margin:0}.tile-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.tile{display:block;min-height:195px;background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:20px;text-decoration:none;position:relative;overflow:hidden}.tile:after{content:"↗";position:absolute;right:18px;bottom:15px;color:var(--teal);font-weight:800}.tile .tile-icon{display:block;font-size:31px;margin-bottom:38px;color:var(--teal)}.tile p{margin:4px 0 0;color:var(--muted);font-size:14px}.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.product-card{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column}.product-visual{aspect-ratio:1/1;background:#edf1ef;display:grid;place-items:center;color:var(--teal);position:relative}.product-visual svg{width:53%;height:53%;stroke:currentColor;fill:none;stroke-width:1.4}.source-chip{position:absolute;left:12px;top:12px;background:#fff;padding:4px 7px;border-radius:99px;font-size:11px;font-weight:750;color:var(--ink);border:1px solid var(--line)}.card-content{padding:18px;display:flex;flex-direction:column;flex:1}.card-content h3{font-size:22px}.card-content p{margin:4px 0 14px;color:var(--muted);font-size:14px}.fit-line{font-size:13px;padding:8px 0;border-top:1px solid var(--line);margin-top:auto}.fit-line strong{color:var(--teal)}.card-link{margin-top:14px;font-weight:750;color:var(--navy)}.guide-hero{padding:54px 0 36px;background:var(--paper);border-bottom:1px solid var(--line)}.breadcrumbs{font-size:13px;color:var(--muted);margin-bottom:24px}.guide-layout{display:grid;grid-template-columns:1fr 300px;gap:28px}.filter-panel{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:18px;height:max-content;position:sticky;top:86px}.filter-panel h3{font-family:inherit;font-size:15px;font-weight:800;letter-spacing:0;margin:0 0 10px}.filter{display:flex;justify-content:space-between;width:100%;padding:12px 0;border:0;border-top:1px solid var(--line);background:none;text-align:left;color:var(--ink);cursor:pointer}.listing-tools{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px;font-size:14px}.filter-trigger{display:none}.product-list{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}.product-list .product-card h3{font-size:20px}.product-list .product-card{min-height:100%}.detail{padding:42px 0 80px}.detail-grid{display:grid;grid-template-columns:1fr .9fr;gap:48px}.detail-visual{aspect-ratio:1/1;background:#e8eeeb;border:1px solid var(--line);border-radius:16px;display:grid;place-items:center;color:var(--teal)}.detail-visual svg{width:55%;height:55%;stroke:currentColor;fill:none;stroke-width:1.2}.detail-main{max-width:700px}.decision-panel{padding:22px;background:var(--paper);border:1px solid var(--line);border-radius:var(--radius)}.decision-panel h1{font-size:clamp(38px,5vw,56px);margin-top:12px}.facts{display:grid;grid-template-columns:1fr 1fr;gap:0;margin:20px 0;border-top:1px solid var(--line);border-left:1px solid var(--line)}.fact{padding:12px;border-right:1px solid var(--line);border-bottom:1px solid var(--line);font-size:14px}.fact span{display:block;color:var(--muted);font-size:12px}.fit-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:28px 0}.fit-card{border:1px solid var(--line);padding:17px;border-radius:var(--radius);background:var(--paper)}.fit-card h3{font-size:19px}.fit-card p{font-size:14px;margin:0;color:var(--muted)}.source-block{margin-top:22px;padding-top:20px;border-top:1px solid var(--line)}.source-block ul{padding-left:19px;margin:10px 0}.source-block li{margin:8px 0;font-size:14px}.footer{padding:30px 0;border-top:1px solid var(--line);font-size:13px;color:var(--muted)}.mobile-only{display:none}@media(max-width:1024px){.hero-grid,.detail-grid{gap:30px}.guide-layout{grid-template-columns:1fr 240px}.card-grid{grid-template-columns:repeat(2,1fr)}}@media(max-width:760px){.nav{padding:13px 18px}.nav-links{display:none}.menu{display:block}.container{padding:0 18px}.hero{padding:42px 0}.hero-grid,.detail-grid,.guide-layout{grid-template-columns:1fr}.hero-art{min-height:230px;order:-1}.section{padding:48px 0}.section-header{display:block}.section-header p{margin-top:10px}.tile-grid{grid-template-columns:1fr 1fr;gap:12px}.tile{min-height:168px;padding:15px}.tile .tile-icon{margin-bottom:27px}.card-grid,.product-list,.fit-grid{grid-template-columns:1fr}.card-grid .product-card:not(:first-child){display:none}.product-list .product-card{display:flex}.filter-panel{display:none}.filter-trigger{display:inline-flex}.listing-tools{gap:10px}.detail{padding-top:28px}.detail-grid{gap:22px}.detail-visual{max-width:380px}.facts{grid-template-columns:1fr}.desktop-only{display:none}.mobile-only{display:block}h1{font-size:42px}.lead{font-size:17px}}
/* Final cascade overrides for intrinsic grid content. */
.hero-grid{grid-template-columns:minmax(0,1.12fr) minmax(0,.88fr)}
.guide-layout{grid-template-columns:minmax(0,1fr) 300px}
.product-list{grid-template-columns:repeat(2,minmax(0,1fr))}
.detail-grid{grid-template-columns:minmax(0,1fr) minmax(0,.9fr)}
.product-card,.card-content,.decision-panel{min-width:0}
.facts{grid-template-columns:repeat(2,minmax(0,1fr))}
.fit-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
.fact,.source-block li{overflow-wrap:anywhere}
@media(max-width:1100px) and (min-width:761px){.product-list{grid-template-columns:1fr}}
/* V2 focused layout refinement. */
@media(min-width:1101px){.guide-layout{grid-template-columns:220px minmax(0,1fr)}.product-list{grid-template-columns:repeat(3,minmax(0,1fr))}.filter-panel{top:92px}.product-list .card-content{padding:16px}.product-list .card-content h3{font-size:18px;line-height:1.15}.product-list .card-content p{font-size:13px;line-height:1.4}.product-list .fit-line{font-size:12px}}
@media(max-width:1100px) and (min-width:761px){.guide-layout{grid-template-columns:1fr}.filter-panel{display:none}.filter-trigger{display:inline-flex}.product-list{grid-template-columns:repeat(2,minmax(0,1fr))}.product-list .card-content h3{font-size:20px}}
.detail-main{max-width:none}.detail-main>.section{padding-left:0;padding-right:0}.detail-main>.section.alt{padding-left:0;padding-right:0}.decision-panel .notice{margin:18px 0 12px}.source-block{max-width:900px}.source-block li{line-height:1.45}
@media(max-width:760px){.product-list{grid-template-columns:1fr}.listing-tools{align-items:flex-start;flex-wrap:wrap}.listing-tools p{width:100%;margin:0}.filter-trigger{display:inline-flex}.detail-main>.section{padding-top:40px;padding-bottom:40px}}
/* V3 interaction states: no new product functionality; only declared prototype controls. */
.nav-links.is-open{display:flex}
.filter-panel.is-open{display:block}
.filter[aria-pressed="true"]{color:var(--teal);font-weight:800}
@media(max-width:760px){.nav-links.is-open{position:absolute;left:18px;right:18px;top:58px;display:flex;flex-direction:column;align-items:stretch;gap:0;padding:8px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}.nav-links.is-open a{padding:11px 8px;border-bottom:1px solid var(--line)}.nav-links.is-open a:last-child{border-bottom:0}.filter-panel.is-open{position:static;margin-bottom:16px}}
@media(min-width:1101px){.product-list{grid-template-columns:repeat(3,minmax(260px,1fr))}}
.fit-tool{max-width:980px;margin:0 auto}.fit-tool-intro{max-width:680px;color:var(--muted)}.fit-tool form{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin-top:24px}.fit-tool fieldset{border:1px solid var(--line);border-radius:var(--radius);padding:16px;background:var(--paper);min-width:0}.fit-tool legend{font-family:Georgia,"Times New Roman",serif;font-size:19px;line-height:1.2;padding:0 5px;margin-bottom:10px}.answer{display:flex;align-items:flex-start;gap:9px;border-top:1px solid var(--line);padding:10px 0;font-size:14px;cursor:pointer}.answer input{accent-color:var(--teal);margin-top:4px}.fit-tool form>.button{grid-column:1/-1;justify-self:start}.fit-result{margin-top:22px;border:1px solid var(--teal);border-left:4px solid var(--teal);border-radius:var(--radius);background:var(--soft-teal);padding:20px}.fit-result.needs-info{border-color:var(--warm);background:var(--soft-warm)}.fit-result h3{font-size:25px;margin-bottom:8px}.fit-result p{margin:6px 0}.fit-result ul{margin:9px 0;padding-left:20px}.fit-rule-note{font-size:13px;color:var(--muted);margin:16px 0 0;max-width:760px}@media(max-width:900px){.fit-tool form{grid-template-columns:1fr}.fit-tool form>.button{width:100%}}
/* Q3.2 layout fix: keep semantic legends fully inside their fieldset cards. */
.fit-tool fieldset{display:flex;flex-direction:column;align-self:stretch;min-height:228px}
.fit-tool legend{display:block;width:100%;box-sizing:border-box;padding:0 0 12px;margin:0 0 0;position:static;white-space:normal;overflow-wrap:anywhere}
@media(max-width:900px){.fit-tool fieldset{min-height:0}}
/* Native legend participates in the card flow instead of cutting through its border. */
.fit-tool fieldset{padding:16px;overflow:hidden}
.fit-tool legend{display:block;float:left;width:100%;padding:0 0 12px;margin:0;position:static}
.fit-tool fieldset::after{content:"";display:block;clear:both}

/* Q3.2 mobile layout fix: single-column hero, guide and detail grids; content first, buttons bounded. */
@media(max-width:760px){
  .hero-grid{grid-template-columns:1fr}
  .detail-grid{grid-template-columns:1fr}
  .guide-layout{grid-template-columns:1fr}
  .hero-art{order:0}
  .hero .button{max-width:100%;min-width:0;overflow-wrap:anywhere}
}