/* ============ COSENG Heatune Support — shared stylesheet (Style B) ============ */
:root{
  --red:#E00010; --red-dk:#B3000D; --red-soft:#FCE9EA; --red-tint:#FDF3F4;
  --green:#009040; --green-soft:#E6F4EC;
  --ink:#15171c; --slate:#4b535e; --soft:#677581; --faint:#9aa1ab;
  --line:#e8eaef; --line-2:#f0f2f5; --bg:#ffffff; --wash:#f6f7f9; --wash-2:#fafbfc;
  --shadow:0 18px 48px -24px rgba(21,23,28,.28);
  --shadow-sm:0 6px 18px -10px rgba(21,23,28,.22);
  --r:14px; --r-lg:20px; --max:1140px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:88px}
body{background:var(--bg);color:var(--ink);font-family:'Hanken Grotesk',system-ui,sans-serif;-webkit-font-smoothing:antialiased;line-height:1.6}
h1,h2,h3,h4,.dsp{font-family:'Sora',sans-serif;letter-spacing:-.02em;line-height:1.12}
img{max-width:100%;display:block}
a{color:inherit}
.wrap{max-width:var(--max);margin:0 auto;padding:0 24px}
.eyebrow{font-family:'Sora';font-size:12.5px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--red-dk);margin-bottom:14px}

/* ---- accessibility: skip link + keyboard focus ---- */
.skip{position:absolute;left:-999px;top:0;z-index:200;background:var(--ink);color:#fff;padding:12px 18px;border-radius:0 0 10px 0;font-family:'Sora';font-weight:600;font-size:14px;text-decoration:none}
.skip:focus{left:0}
:focus-visible{outline:3px solid var(--red);outline-offset:2px;border-radius:4px}
a:focus-visible,button:focus-visible,summary:focus-visible,[tabindex]:focus-visible{outline:3px solid var(--red);outline-offset:2px}
.muted{color:var(--slate)}
.center{text-align:center}
.btn{display:inline-flex;align-items:center;gap:9px;font-family:'Sora';font-weight:600;font-size:15px;padding:13px 22px;border-radius:11px;text-decoration:none;border:none;cursor:pointer;transition:transform .15s ease, box-shadow .2s ease, background .2s}
.btn:active{transform:translateY(1px)}
.btn-red{background:var(--red);color:#fff;box-shadow:0 10px 24px -10px rgba(224,0,16,.55)}
.btn-red:hover{background:var(--red-dk)}
.btn-dark{background:var(--ink);color:#fff}
.btn-dark:hover{background:#000}
.btn-ghost{background:#fff;color:var(--ink);border:1px solid var(--line)}
.btn-ghost:hover{border-color:var(--soft)}
.btn-lg{padding:15px 26px;font-size:16px}
.pill{display:inline-flex;align-items:center;gap:8px;background:var(--red-soft);color:var(--red-dk);font-weight:600;font-size:13.5px;padding:7px 14px;border-radius:30px}

/* ---- reveal (subtle, staggered via JS --d) ---- */
.rv{opacity:0;transform:translateY(13px);transition:opacity .55s ease, transform .7s cubic-bezier(.16,.84,.32,1);transition-delay:var(--d,0s);will-change:opacity,transform}
.rv.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.rv,.gallery img,.mcard,.feat,a.feat{opacity:1!important;transform:none!important;transition:none!important}html{scroll-behavior:auto}}

/* ---- utility bar ---- */
.util{background:var(--ink);color:#cfd4dc}
.util .wrap{display:flex;justify-content:space-between;align-items:center;min-height:38px;font-size:12.5px;font-weight:500;gap:14px;flex-wrap:wrap}
.util b{color:#fff;font-weight:600}
.util .badge{background:rgba(255,255,255,.09);padding:3px 10px;border-radius:20px;font-size:11.5px;letter-spacing:.03em}
.util a{color:#fff;text-decoration:none;display:inline-flex;align-items:center;gap:6px}
.util a:hover{text-decoration:underline}

/* ---- nav ---- */
header.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.86);backdrop-filter:saturate(180%) blur(12px);border-bottom:1px solid var(--line)}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;height:70px;gap:20px}
.brand{display:flex;align-items:center;gap:11px;text-decoration:none;flex-shrink:0}
.brand img{height:30px;width:auto}
.brand .sep{width:1px;height:26px;background:var(--line)}
.brand .sub{font-size:12px;color:var(--slate);font-weight:600;line-height:1.15}
.brand .sub b{display:block;color:var(--ink);font-family:'Sora';font-size:13px}
.nav-links{display:flex;gap:28px;font-size:14.5px;font-weight:600;color:var(--slate)}
.nav-links a{text-decoration:none;transition:color .15s}
.nav-links a:hover{color:var(--ink)}
.nav-links a.active{color:var(--red-dk)}
.nav-right{display:flex;align-items:center;gap:14px}
.nav .nav-right .btn{padding:10px 18px;font-size:14px}
.burger{display:none;background:none;border:1px solid var(--line);border-radius:9px;width:42px;height:42px;cursor:pointer;align-items:center;justify-content:center}
.burger span{display:block;width:18px;height:2px;background:var(--ink);position:relative}
.burger span::before,.burger span::after{content:"";position:absolute;left:0;width:18px;height:2px;background:var(--ink)}
.burger span::before{top:-6px}.burger span::after{top:6px}

/* ---- breadcrumb ---- */
.crumb{background:var(--wash);border-bottom:1px solid var(--line)}
.crumb .wrap{display:flex;align-items:center;gap:9px;height:46px;font-size:13.5px;color:var(--soft);font-weight:500}
.crumb a{text-decoration:none;color:var(--slate)}
.crumb a:hover{color:var(--red-dk)}
.crumb .cur{color:var(--ink);font-weight:600}
.crumb .arr{color:var(--faint)}

/* ---- hero (brand / home) ---- */
.hero{background:linear-gradient(180deg,#fff 0%,var(--wash) 100%);border-bottom:1px solid var(--line);overflow:hidden}
.hero .wrap{display:grid;grid-template-columns:1.04fr .96fr;gap:52px;align-items:center;padding:64px 24px 70px}
.hero h1{font-size:52px;font-weight:800}
.hero h1 .r{color:var(--red-dk)}
.hero .lead{margin-top:20px;font-size:18.5px;color:var(--slate);max-width:480px}
.chips{display:flex;flex-wrap:wrap;gap:9px;margin-top:26px}
.chip{display:inline-flex;align-items:center;gap:8px;background:#fff;border:1px solid var(--line);border-radius:30px;padding:8px 14px;font-size:13.5px;font-weight:600;box-shadow:var(--shadow-sm)}
.chip .dot{width:8px;height:8px;border-radius:50%;background:var(--green)}
.chip .dot.r{background:var(--red)}
.hero-media{position:relative}
.hero-media>img{width:100%;border-radius:var(--r-lg)}

/* picker card (home hero) */
.picker{background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);padding:26px;box-shadow:var(--shadow);position:relative}
.picker h3{font-size:19px;font-weight:700}
.picker .ps{font-size:14px;color:var(--soft);margin:4px 0 18px}
.seg{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:14px}
.seg a{font-family:'Sora';font-weight:600;font-size:15px;padding:16px 14px;border-radius:12px;border:1.5px solid var(--line);background:var(--wash-2);text-decoration:none;text-align:left;transition:all .15s}
.seg a .m{display:block;font-size:17px;color:var(--ink)}
.seg a .d{display:block;font-size:12.5px;color:var(--soft);font-weight:500;margin-top:2px}
.seg a:hover{border-color:var(--red-dk);background:var(--red-tint)}
.picker .quick{display:grid;grid-template-columns:1fr 1fr;gap:9px;margin-top:4px}
.picker .quick a{display:flex;align-items:center;gap:9px;background:var(--wash-2);border:1px solid var(--line-2);border-radius:11px;padding:12px;font-size:13.5px;font-weight:600;text-decoration:none;transition:background .15s}
.picker .quick a:hover{background:var(--wash)}
.picker .quick .ic{width:26px;height:26px;border-radius:8px;display:grid;place-items:center;background:var(--red-soft);color:var(--red-dk);flex-shrink:0}

/* ---- product hero (per-product page) ---- */
.phero{background:linear-gradient(180deg,#fff,var(--wash));border-bottom:1px solid var(--line)}
.phero .wrap{display:grid;grid-template-columns:.95fr 1.05fr;gap:48px;align-items:center;padding:50px 24px 60px}
.phero .ph-img{background:linear-gradient(160deg,#f3f4f6,#e9ebef);border:1px solid var(--line);border-radius:var(--r-lg);padding:30px}
.phero .ph-img img{width:100%;border-radius:12px}
.phero h1{font-size:46px;font-weight:800;margin-top:8px}
.phero .lead{margin-top:16px;font-size:18px;color:var(--slate);max-width:480px}
.phero .acts{display:flex;gap:12px;margin-top:26px;flex-wrap:wrap}

/* ---- section frame ---- */
section{padding:74px 0}
.sec-head{max-width:620px;margin-bottom:38px}
.sec-head.c{margin-left:auto;margin-right:auto;text-align:center}
.sec-head h2{font-size:36px;font-weight:800}
.sec-head p{margin-top:14px;font-size:17px;color:var(--slate)}
.alt{background:var(--wash);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}

/* ---- product / model cards (home grid) ---- */
.models{display:grid;grid-template-columns:1fr 1fr;gap:22px}
.mcard{background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden;display:flex;flex-direction:column;transition:box-shadow .2s, transform .2s;text-decoration:none;color:inherit}
.mcard:hover{box-shadow:var(--shadow);transform:translateY(-3px)}
.mcard .ph{background:linear-gradient(160deg,#f3f4f6,#e9ebef);padding:24px;position:relative}
.mcard .ph img{width:100%;border-radius:10px}
.mcard .tagn{position:absolute;top:16px;left:16px;background:var(--ink);color:#fff;font-family:'Sora';font-weight:700;font-size:13px;padding:5px 12px;border-radius:20px}
.mcard .body{padding:24px 24px 26px;display:flex;flex-direction:column;flex:1}
.mcard h3{font-size:23px;font-weight:700}
.mcard .sub{font-size:14px;color:var(--slate);margin:6px 0 16px}
.specs{display:grid;grid-template-columns:1fr 1fr;gap:10px 14px;margin-bottom:20px}
.specs .s{display:flex;gap:9px;align-items:flex-start;font-size:13.5px}
.specs .s svg{flex-shrink:0;margin-top:2px}
.specs .s b{font-family:'Sora';font-weight:600;color:var(--ink)}
.specs .s span{color:var(--slate)}
.mcard .acts{margin-top:auto;display:flex;flex-direction:column;gap:9px}
.mcard .acts .btn{justify-content:center}
.mcard .go-row{display:flex;align-items:center;justify-content:space-between;font-family:'Sora';font-weight:600;color:var(--red-dk);font-size:15px}

/* placeholder "coming soon" product card */
.mcard.soon{align-items:center;justify-content:center;text-align:center;border-style:dashed;background:var(--wash-2);min-height:240px;padding:30px}
.mcard.soon .ic{width:48px;height:48px;border-radius:14px;background:#fff;border:1px solid var(--line);display:grid;place-items:center;margin:0 auto 14px;color:var(--soft)}
.mcard.soon h3{font-size:18px;color:var(--slate)}
.mcard.soon p{font-size:14px;color:var(--soft);margin-top:6px}

/* ---- steps ---- */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.step{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:22px;position:relative}
.step .no{font-family:'Sora';font-weight:800;font-size:14px;color:#fff;background:var(--red);width:30px;height:30px;border-radius:9px;display:grid;place-items:center;margin-bottom:14px}
.step h4{font-size:16.5px;font-weight:700;margin-bottom:7px}
.step p{font-size:14px;color:var(--slate)}
.step .img{margin:-22px -22px 16px;border-radius:var(--r) var(--r) 0 0;overflow:hidden}
.step.has-img{padding-top:0}
.step.has-img .no{position:absolute;top:14px;left:14px;margin:0;box-shadow:0 4px 10px -3px rgba(0,0,0,.4)}

/* ---- features / help grid ---- */
.fgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.feat{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:24px}
.feat .ic{width:46px;height:46px;border-radius:12px;background:var(--red-soft);color:var(--red-dk);display:grid;place-items:center;margin-bottom:16px;font-size:20px}
.feat h4{font-size:17px;font-weight:700;margin-bottom:8px}
.feat p{font-size:14.5px;color:var(--slate)}
.feat .kbd{display:inline-block;font-family:'Sora';font-weight:600;font-size:12px;background:var(--wash);border:1px solid var(--line);border-radius:6px;padding:2px 7px;margin:2px 3px 0 0;color:var(--ink)}
a.feat{text-decoration:none;color:inherit;transition:box-shadow .2s, transform .2s}
a.feat:hover{box-shadow:var(--shadow);transform:translateY(-3px)}
a.feat .more{display:inline-block;margin-top:12px;font-family:'Sora';font-weight:600;font-size:14px;color:var(--red-dk)}

/* ---- feature gallery ---- */
.gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.gallery a{display:block;border-radius:var(--r);overflow:hidden;border:1px solid var(--line);background:var(--wash);position:relative;aspect-ratio:1/1}
.gallery img{width:100%;height:100%;object-fit:cover;transition:transform .4s cubic-bezier(.2,.7,.2,1)}
.gallery a:hover img{transform:scale(1.04)}

/* ---- spec table ---- */
.spectable{background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden;max-width:760px;margin:0 auto;box-shadow:var(--shadow-sm)}
.spectable .sr{display:grid;grid-template-columns:38% 62%;border-bottom:1px solid var(--line-2)}
.spectable .sr:last-child{border-bottom:none}
.spectable .sr:nth-child(odd){background:var(--wash-2)}
.spectable .sk{padding:15px 22px;font-family:'Sora';font-weight:600;font-size:14.5px;color:var(--slate);display:flex;align-items:center;gap:9px}
.spectable .sv{padding:15px 22px;font-size:15px;color:var(--ink);font-weight:500}
.spectable .sv .hl{color:var(--red-dk);font-weight:700;font-family:'Sora'}

/* ---- controls ---- */
.controls-wrap{display:grid;grid-template-columns:.9fr 1.1fr;gap:40px;align-items:center}
.controls-wrap>img{border-radius:var(--r-lg);border:1px solid var(--line)}
.ctrl-list{display:flex;flex-direction:column;gap:4px}
.ctrl{display:flex;gap:15px;padding:15px 0;border-bottom:1px solid var(--line-2)}
.ctrl:last-child{border-bottom:none}
.ctrl .key{font-family:'Sora';font-weight:700;font-size:13px;color:var(--red-dk);background:var(--red-soft);border-radius:8px;padding:7px 11px;height:fit-content;white-space:nowrap;min-width:62px;text-align:center}
.ctrl .t b{font-family:'Sora';font-size:15px;font-weight:600;display:block;margin-bottom:2px}
.ctrl .t span{font-size:14px;color:var(--slate)}

/* ---- accordion ---- */
.acc{max-width:820px;margin:0 auto;display:flex;flex-direction:column;gap:12px}
.ai{background:#fff;border:1px solid var(--line);border-radius:var(--r);overflow:hidden}
.ai summary{list-style:none;cursor:pointer;padding:20px 22px;display:flex;align-items:center;gap:14px;font-family:'Sora';font-weight:600;font-size:16px}
.ai summary::-webkit-details-marker{display:none}
.ai summary .q{width:30px;height:30px;border-radius:9px;background:var(--red-soft);color:var(--red-dk);display:grid;place-items:center;flex-shrink:0;font-weight:700}
.ai summary .ch{margin-left:auto;color:var(--soft);transition:transform .25s}
.ai[open] summary .ch{transform:rotate(45deg)}
.ai[open] summary{border-bottom:1px solid var(--line-2)}
.ai .ac{padding:18px 22px 22px 66px;font-size:15px;color:var(--slate)}
.ai .ac p+p{margin-top:10px}
.ai .ac b{color:var(--ink)}
.ai .ac ul{margin:8px 0 0 18px}
.ai .ac li{margin-bottom:6px}
.ai .ac a{color:var(--red-dk);font-weight:600}

/* ---- warranty form ---- */
.wform-wrap{display:grid;grid-template-columns:.85fr 1.15fr;gap:42px;align-items:start}
.wbenefits{position:sticky;top:96px}
.wbenefits .b{display:flex;gap:13px;margin-bottom:20px}
.wbenefits .b .ic{width:40px;height:40px;border-radius:11px;background:var(--green-soft);color:var(--green);display:grid;place-items:center;flex-shrink:0}
.wbenefits .b h4{font-family:'Sora';font-size:16px;font-weight:600;margin-bottom:3px}
.wbenefits .b p{font-size:14px;color:var(--slate)}
.card-form{background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);padding:30px;box-shadow:var(--shadow)}
.fg{margin-bottom:16px}
.fg label{display:block;font-family:'Sora';font-size:13.5px;font-weight:600;margin-bottom:7px}
.fg label .opt{color:var(--soft);font-weight:500}
.fg input,.fg select{width:100%;font-family:inherit;font-size:15px;padding:13px 14px;border:1.5px solid var(--line);border-radius:11px;background:var(--wash-2);transition:border .15s, box-shadow .15s;color:var(--ink)}
.fg input:focus,.fg select:focus{outline:none;border-color:var(--red-dk);box-shadow:0 0 0 3px rgba(224,0,16,.1);background:#fff}
.frow{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.form-note{font-size:12.5px;color:var(--soft);margin-top:6px}
.form-msg{display:none;padding:14px 16px;border-radius:11px;font-size:14px;font-weight:500;margin-bottom:18px}
.form-msg.ok{display:block;background:var(--green-soft);color:#06753a;border:1px solid #b8e2c8}
.form-msg.err{display:block;background:var(--red-soft);color:var(--red-dk);border:1px solid #f3c4c7}
.devnote{background:#fff8e6;border:1px solid #f3e2a8;color:#7a5d00;font-size:12.5px;padding:10px 13px;border-radius:10px;margin-bottom:18px}
.devnote b{color:#5e4700}

/* ---- help / contact ---- */
.help{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.hcard{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:26px;text-align:center}
.hcard .ic{width:52px;height:52px;border-radius:14px;background:var(--red-soft);color:var(--red-dk);display:grid;place-items:center;margin:0 auto 16px;font-size:22px}
.hcard h4{font-size:17px;font-weight:700;margin-bottom:7px}
.hcard p{font-size:14px;color:var(--slate);margin-bottom:14px}
.hcard a.lnk{font-family:'Sora';font-weight:600;color:var(--red-dk);text-decoration:none;font-size:15px}
.hcard a.lnk:hover{text-decoration:underline}
.ph-tag{font-size:11px;color:var(--soft);font-weight:600;letter-spacing:.05em;text-transform:uppercase;display:block;margin-top:6px}

/* ---- trust band ---- */
.trust-band{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);padding:34px;box-shadow:var(--shadow-sm)}
.tb{ text-align:center}
.tb .n{font-family:'Sora';font-size:34px;font-weight:800;color:var(--ink)}
.tb .n em{font-style:normal;color:var(--red-dk)}
.tb .l{font-size:14px;color:var(--slate);font-weight:500;margin-top:4px}

/* ---- amazon cta ---- */
.cta-band{background:linear-gradient(135deg,#15171c,#22252d);border-radius:var(--r-lg);padding:48px;color:#fff;display:grid;grid-template-columns:1.3fr .7fr;gap:30px;align-items:center;position:relative;overflow:hidden}
.cta-band::after{content:"";position:absolute;width:380px;height:380px;border-radius:50%;background:radial-gradient(circle,rgba(224,0,16,.28),transparent 65%);top:-120px;right:-80px}
.cta-band h2{font-size:30px;font-weight:800;position:relative}
.cta-band p{color:#c4c9d1;margin-top:12px;font-size:16px;position:relative;max-width:440px}
.cta-band .acts{position:relative;display:flex;flex-direction:column;gap:11px}
.cta-band .acts .btn{justify-content:center}
.btn-amz{background:#FF9900;color:#15171c}
.btn-amz:hover{background:#f08c00}
.stars{color:#FF9900;font-size:18px;letter-spacing:2px}

/* ---- footer ---- */
footer{background:var(--ink);color:#aab1bc;padding:56px 0 30px}
.fgrid-foot{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:30px;padding-bottom:36px;border-bottom:1px solid #2a2e36}
.fbrand .wm{font-family:'Sora';font-weight:800;font-size:26px;color:#fff;letter-spacing:.02em}
.fbrand .wm span{color:var(--red-dk)}
.fbrand .tg{color:var(--green);font-weight:600;font-size:13px;margin-top:-2px;letter-spacing:.04em}
.fbrand p{font-size:14px;margin-top:14px;max-width:300px;color:#8b94a1}
.fbrand .certs{display:flex;gap:8px;margin-top:16px;flex-wrap:wrap}
.fbrand .certs span{background:#23262e;border:1px solid #2f333c;color:#cfd4dc;font-size:11.5px;font-weight:600;padding:4px 10px;border-radius:6px}
footer h5{font-family:'Sora';color:#fff;font-size:13px;font-weight:600;letter-spacing:.04em;text-transform:uppercase;margin-bottom:16px}
footer ul{list-style:none}
footer li{margin-bottom:10px}
footer a{color:#aab1bc;text-decoration:none;font-size:14px}
footer a:hover{color:#fff}
.foot-bottom{display:flex;justify-content:space-between;align-items:center;padding-top:24px;font-size:13px;color:#727a86;gap:14px;flex-wrap:wrap}

/* ---- responsive ---- */
@media (max-width:980px){
  .hero .wrap,.phero .wrap{grid-template-columns:1fr;gap:36px;padding:48px 24px 56px}
  .hero-media,.phero .ph-img{order:-1}
  .controls-wrap,.wform-wrap{grid-template-columns:1fr;gap:28px}
  .wbenefits{position:static}
  .cta-band{grid-template-columns:1fr;padding:36px}
  .trust-band{grid-template-columns:1fr 1fr;gap:26px}
  .fgrid-foot{grid-template-columns:1fr 1fr;gap:26px}
  .fbrand{grid-column:1/-1}
  .gallery{grid-template-columns:1fr 1fr}
}
@media (max-width:760px){
  .nav-links{display:none}
  .nav-links.open{display:flex;position:absolute;top:70px;left:0;right:0;background:#fff;flex-direction:column;gap:0;padding:8px 24px 18px;border-bottom:1px solid var(--line);box-shadow:var(--shadow)}
  .nav-links.open a{padding:13px 0;border-bottom:1px solid var(--line-2)}
  .burger{display:flex}
  .nav .nav-right .btn{display:none}
  .hero h1{font-size:38px}.phero h1{font-size:34px}
  .sec-head h2{font-size:28px}
  section{padding:54px 0}
  .models,.steps,.fgrid,.help{grid-template-columns:1fr}
  .steps{gap:14px}
  .frow{grid-template-columns:1fr;gap:0}
  .brand .sub{display:none}
  .util .wrap{justify-content:center;font-size:11.5px}
}
@media (max-width:420px){
  .hero h1{font-size:32px}
  .seg{grid-template-columns:1fr}
  .specs{grid-template-columns:1fr}
  .trust-band{grid-template-columns:1fr}
}