/* ==========================================================================
   periosaw.com — NiTi Perio Saw® shop (static). Colours, spacing and section
   styles follow the Shopify home section that was live until 2026-10
   (theme/vet-home.liquid v8), so the pages look the same as before.
   ========================================================================== */
:root{
  --ink:#16202b; --mute:#55606b; --line:#dde3e8; --soft:#f4f7f9; --acc:#0f5c7a; --acc-dark:#0b485f;
  --warn:#8a5a00; --warn-bg:#fff7e6; --warn-line:#f0d9a8; --ok:#1d5a32; --ok-bg:#eaf6ee; --err:#8a1f1f; --err-bg:#fdecec;
  --band:#0e2233; --white:#fff; --max:1120px;
  --font:"Assistant",system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Malgun Gothic",sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;font-family:var(--font);font-size:16px;line-height:1.6;color:var(--ink);background:var(--white);-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:var(--acc);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3,h4{margin:0 0 .4em;line-height:1.2;font-weight:700;color:var(--ink)}
h1{font-size:clamp(1.9rem,3.6vw,2.75rem)}
h2{font-size:clamp(1.4rem,2.4vw,1.9rem)}
h3{font-size:1.1rem}
p{margin:0 0 1em}
ul,ol{margin:0 0 1em;padding-left:1.3em}
table{border-collapse:collapse;width:100%}
code{font-size:.85em;color:var(--acc)}
sup{font-size:.6em;vertical-align:.6em;line-height:0}
.wrap{max-width:var(--max);margin:0 auto;padding:0 20px}
.narrow{max-width:780px}
.skip{position:absolute;left:-9999px;top:0;background:var(--acc);color:#fff;padding:8px 12px;z-index:100}
.skip:focus{left:8px;top:8px}
.eyebrow{font-size:.8rem;letter-spacing:.08em;text-transform:uppercase;color:var(--acc);font-weight:700;margin:0 0 10px}
.sub{color:var(--mute);margin:0 0 24px}
.small{font-size:.85rem;color:var(--mute)}
.btn{display:inline-block;padding:12px 22px;border-radius:6px;text-decoration:none;border:2px solid var(--acc);font:inherit;font-weight:700;cursor:pointer;line-height:1.3;transition:background .15s,color .15s}
.btn:hover{text-decoration:none}
.btn-p{background:var(--acc);color:#fff}
.btn-p:hover{background:var(--acc-dark);border-color:var(--acc-dark)}
.btn-s{background:#fff;color:var(--acc)}
.btn-s:hover{background:var(--soft)}
.btn-w{background:#fff;color:var(--band);border-color:#fff}
.btn[disabled]{opacity:.5;cursor:not-allowed}
.btn-sm{padding:8px 14px;font-size:.9rem}

/* header ------------------------------------------------------------------ */
.site-header{border-bottom:1px solid var(--line);background:#fff;position:sticky;top:0;z-index:50}
.header-row{display:flex;align-items:center;gap:20px;min-height:64px;position:relative}
.brand{font-size:1.35rem;font-weight:700;color:var(--ink);letter-spacing:-.01em;white-space:nowrap}
.brand:hover{text-decoration:none;color:var(--acc)}
.site-nav{flex:1}
.site-nav ul{list-style:none;margin:0;padding:0;display:flex;gap:4px}
.site-nav li{position:relative}
.site-nav a{display:block;padding:10px 12px;color:var(--ink);font-weight:600;border-radius:6px}
.site-nav a:hover,.site-nav a[aria-current]{background:var(--soft);text-decoration:none;color:var(--acc)}
.site-nav .sub{display:none;position:absolute;left:0;top:100%;background:#fff;border:1px solid var(--line);border-radius:8px;padding:6px;min-width:200px;box-shadow:0 8px 24px rgba(22,32,43,.1);flex-direction:column;gap:0;margin:0}
.site-nav .has-sub:hover .sub,.site-nav .has-sub:focus-within .sub{display:flex}
.site-nav .sub a{font-weight:500}
.menu-btn{display:none;margin-left:auto;background:#fff;border:1px solid var(--line);border-radius:6px;padding:8px 12px;font:inherit;font-weight:600;cursor:pointer}
.cart-link{position:relative;display:inline-flex;align-items:center;justify-content:center;width:44px;height:44px;border-radius:6px;color:var(--ink);margin-left:auto}
.cart-link:hover{background:var(--soft)}
.cart-count{position:absolute;top:2px;right:2px;min-width:18px;height:18px;padding:0 5px;border-radius:9px;background:var(--acc);color:#fff;font-size:.72rem;font-weight:700;line-height:18px;text-align:center}
.notice{background:var(--warn-bg);border-bottom:1px solid var(--warn-line);color:var(--warn);text-align:center;padding:9px 16px;font-size:.88rem;font-weight:600}
.notice a{color:inherit;text-decoration:underline;white-space:nowrap}
@media (max-width:900px){
  .menu-btn{display:block}
  .site-nav{display:none;position:absolute;left:-20px;right:-20px;top:100%;background:#fff;border-bottom:1px solid var(--line);padding:8px 20px 16px;box-shadow:0 12px 24px rgba(22,32,43,.08)}
  .site-nav.open{display:block}
  .site-nav ul{flex-direction:column;gap:0}
  .site-nav .sub,.site-nav .has-sub:hover .sub{display:flex;position:static;border:0;box-shadow:none;padding:0 0 0 16px;min-width:0}
  .cart-link{margin-left:0}
}

/* generic sections -------------------------------------------------------- */
.sec{padding:40px 0;border-top:1px solid var(--line)}
.page-head{padding:40px 0 10px}
.grid4{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.card{background:var(--soft);border:1px solid var(--line);border-radius:10px;padding:18px}
.card h3{font-size:1.05rem;margin:0 0 6px}
.card p{margin:0;color:var(--mute);font-size:.95rem}
.two{display:grid;grid-template-columns:1fr 1fr;gap:28px}
.feature{display:grid;grid-template-columns:1fr 1fr;gap:28px;align-items:center;margin-top:28px}
.feature img{width:100%;border-radius:10px;border:1px solid var(--line);max-height:520px;object-fit:contain;background:#fff}
.video{position:relative;padding-top:56.25%;border-radius:10px;overflow:hidden;border:1px solid var(--line);background:#000;margin:0 0 1em}
.video iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.caution{border-left:4px solid var(--warn);background:#fffaf0;padding:14px 18px;border-radius:0 8px 8px 0}
.caution ul,.spec ul{margin:6px 0 0;padding-left:20px}
.spec table{font-size:.95rem}
.spec th,.spec td{text-align:left;padding:8px 10px;border-bottom:1px solid var(--line);vertical-align:top}
.spec th{width:38%;color:var(--mute);font-weight:600}
.steps{counter-reset:s;list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(5,1fr);gap:14px}
.steps li{background:var(--soft);border-radius:10px;padding:16px;font-size:.95rem}
.steps li::before{counter-increment:s;content:counter(s);display:block;font-weight:800;font-size:1.3rem;color:var(--acc);margin-bottom:4px}
.faq details{border:1px solid var(--line);border-radius:10px;padding:14px 18px;margin-bottom:10px;background:#fff}
.faq summary{cursor:pointer;font-weight:700;font-size:1.02rem}
.faq p{margin:10px 0 0;color:var(--mute)}
.order-box{background:var(--soft);border:1px solid var(--line);border-radius:10px;padding:22px;display:flex;flex-wrap:wrap;gap:16px;align-items:center;justify-content:space-between}
.order-box p{margin:0;max-width:680px}
.band{margin-top:48px;background:var(--band);color:#e8eef3;padding:44px 0}
.band h2{color:#fff}.band p{color:#c9d6df;max-width:760px}
.crumbs ol{list-style:none;margin:18px 0 0;padding:0;display:flex;flex-wrap:wrap;gap:6px;font-size:.88rem;color:var(--mute)}
.crumbs li+li::before{content:"\203A";margin-right:6px}
.contact-grid{display:grid;grid-template-columns:1.3fr .7fr;gap:36px;padding:10px 0 50px;align-items:start}
.contact-aside{background:var(--soft);border:1px solid var(--line);border-radius:10px;padding:20px;font-size:.95rem}
.contact-aside h2{font-size:1.1rem}
@media (max-width:900px){.grid4{grid-template-columns:1fr 1fr}.two,.feature,.contact-grid{grid-template-columns:1fr}.steps{grid-template-columns:1fr 1fr}}
@media (max-width:520px){.grid4,.steps{grid-template-columns:1fr}}

/* home -------------------------------------------------------------------- */
.gate{background:var(--soft);border-bottom:1px solid var(--line);padding:36px 0 32px}
.gate h2{margin:0 0 6px}.gate .sub{margin:0 0 20px}
.gate-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.gate-card{display:flex;flex-direction:column;gap:8px;background:#fff;border:2px solid var(--line);border-radius:12px;padding:22px;color:inherit;transition:border-color .15s,box-shadow .15s}
.gate-card:hover,.gate-card:focus-visible{border-color:var(--acc);box-shadow:0 4px 16px rgba(15,92,122,.12);text-decoration:none}
.gate-k{font-size:.8rem;letter-spacing:.08em;text-transform:uppercase;font-weight:700;color:var(--acc)}
.gate-card--h .gate-k{color:var(--warn)}
.gate-card strong{font-size:1.4rem;line-height:1.2}
.gate-card .gate-t{color:var(--mute);font-size:.95rem;flex:1}
.gate-card .btn{align-self:flex-start;margin-top:6px}
.hero{padding:48px 0 32px}
.hero .wrap{display:grid;grid-template-columns:1.05fr .95fr;gap:36px;align-items:center}
.hero h1 .reg{font-size:.8em;font-weight:400;vertical-align:.42em;line-height:0;margin-left:.04em}
.lead{font-size:1.15rem;color:var(--mute);margin:0 0 22px}
.btns{display:flex;flex-wrap:wrap;gap:12px}
.hero img{width:100%;border-radius:10px;border:1px solid var(--line)}
.tips{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.tip{border:1px solid var(--line);border-radius:10px;overflow:hidden;background:#fff;color:inherit;display:flex;flex-direction:column}
.tip:hover{text-decoration:none;border-color:var(--acc)}
.tip img{width:100%;aspect-ratio:2/3;object-fit:contain;background:#fff}
.tip div{padding:14px 16px}
.tip h3{font-size:1.05rem;margin:0 0 4px}
.tip p{margin:0;color:var(--mute);font-size:.92rem}
.tip code{font-size:.8rem}
.guide-list{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.guide-card{border:1px solid var(--line);border-radius:10px;padding:18px;background:#fff;display:flex;flex-direction:column;gap:6px;color:inherit}
.guide-card:hover{text-decoration:none;border-color:var(--acc)}
.guide-card h3{font-size:1.05rem;margin:0;color:var(--acc)}
.guide-card time{font-size:.8rem;color:var(--mute);letter-spacing:.04em;text-transform:uppercase}
.guide-card p{margin:0;color:var(--mute);font-size:.93rem;flex:1}
@media (max-width:900px){.hero .wrap,.gate-grid{grid-template-columns:1fr}.tips{grid-template-columns:1fr 1fr}.guide-list{grid-template-columns:1fr}}
@media (max-width:520px){.tips{grid-template-columns:1fr}}

/* products ----------------------------------------------------------------- */
.product-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:36px;padding:24px 0 10px}
.gallery-main{margin:0;border:1px solid var(--line);border-radius:10px;overflow:hidden;background:#fff}
.gallery-main img{width:100%;aspect-ratio:1/1;object-fit:contain;background:#fff}
.thumbs{display:grid;grid-template-columns:repeat(6,1fr);gap:8px;margin-top:10px}
.thumbs button{padding:0;border:1px solid var(--line);border-radius:6px;background:#fff;cursor:pointer;overflow:hidden}
.thumbs button[aria-current]{border-color:var(--acc);box-shadow:0 0 0 1px var(--acc)}
.thumbs img{aspect-ratio:1/1;object-fit:contain;width:100%}
.buy h1{font-size:clamp(1.5rem,2.6vw,2.1rem)}
.price{font-size:1.6rem;font-weight:700;margin:6px 0 10px}
.price-unit{font-size:.95rem;font-weight:400;color:var(--mute)}
.vet-only{font-size:.9rem;color:var(--warn);background:var(--warn-bg);border:1px solid var(--warn-line);border-radius:8px;padding:10px 12px}
.variants{border:0;padding:0;margin:0 0 14px;min-width:0}
.variants legend{font-weight:700;margin-bottom:8px;padding:0}
.variant-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.variant{display:flex;gap:10px;align-items:flex-start;border:2px solid var(--line);border-radius:8px;padding:10px 12px;cursor:pointer;background:#fff}
.variant:has(input:checked){border-color:var(--acc);background:var(--soft)}
.variant input{margin-top:5px}
.variant b{display:block}
.variant span{display:block;font-size:.85rem;color:var(--mute)}
.includes{background:var(--soft);border:1px solid var(--line);border-radius:8px;padding:10px 12px;font-size:.95rem}
.qty-row{display:flex;align-items:center;gap:12px;margin:0 0 14px}
.qty-row input{width:84px;font:inherit;padding:10px;border:1px solid var(--line);border-radius:6px}
.buy-actions{display:flex;flex-wrap:wrap;gap:10px}
.buy-msg{min-height:1.4em;margin:10px 0 0;font-weight:600;color:var(--ok)}
.trust{list-style:none;padding:0;margin:18px 0 8px;font-size:.92rem;color:var(--mute)}
.trust li{padding:6px 0 6px 26px;position:relative;border-top:1px solid var(--line)}
.trust li::before{content:"\2713";position:absolute;left:4px;color:var(--acc);font-weight:700}
.product-desc{max-width:820px;padding:30px 0 10px}
.desc-feature,.desc-tips{display:grid;grid-template-columns:auto 1fr;gap:20px;align-items:center;margin:18px 0}
.desc-feature img,.desc-tips img{border:1px solid var(--line);border-radius:8px;max-width:360px}
.tip-list{list-style:none;padding:0;margin:0}
.product-related{border-top:1px solid var(--line);padding:30px 0 40px}
.product-related .btn{margin-left:8px}
.rte h2{margin-top:1.4em}.rte h3{margin-top:1.2em}
.rte table{font-size:.95rem;margin:0 0 1.2em}
.rte th,.rte td{text-align:left;padding:8px 10px;border-bottom:1px solid var(--line);vertical-align:top}
.rte th{background:var(--soft)}
.rte blockquote{margin:0 0 1em;padding:10px 18px;border-left:4px solid var(--line);color:var(--mute)}
.rte img{border-radius:8px}
.rte .back{margin-top:30px}
.rte li{margin-bottom:.3em}
.collection-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px;padding:10px 0 40px}
.pcard{border:1px solid var(--line);border-radius:10px;overflow:hidden;background:#fff;color:inherit;display:flex;flex-direction:column}
.pcard:hover{text-decoration:none;border-color:var(--acc)}
.pcard img{aspect-ratio:4/3;object-fit:contain;background:#fff;width:100%}
.pcard div{padding:16px 18px}
.pcard h2{font-size:1.15rem;margin:0 0 4px}
.pcard .price{font-size:1.2rem;margin:0}
.pcard p{margin:6px 0 0;color:var(--mute);font-size:.93rem}
@media (max-width:900px){.product-grid{grid-template-columns:1fr}.thumbs{grid-template-columns:repeat(5,1fr)}.collection-grid{grid-template-columns:1fr}.desc-feature,.desc-tips{grid-template-columns:1fr}}

/* cart & checkout ---------------------------------------------------------- */
.cart-layout{display:grid;grid-template-columns:1.4fr .8fr;gap:32px;align-items:start;padding:10px 0 50px}
.cart-table th,.cart-table td{text-align:left;padding:12px 8px;border-bottom:1px solid var(--line);vertical-align:middle}
.cart-table th{font-size:.85rem;color:var(--mute);font-weight:600}
.cart-item{display:flex;gap:14px;align-items:center}
.cart-item img{width:72px;height:72px;object-fit:contain;border:1px solid var(--line);border-radius:6px;background:#fff}
.cart-item b{display:block}
.cart-item span{font-size:.85rem;color:var(--mute)}
.cart-table input[type=number]{width:70px;font:inherit;padding:8px;border:1px solid var(--line);border-radius:6px}
.link-btn{background:none;border:0;padding:0;color:var(--acc);font:inherit;cursor:pointer;text-decoration:underline}
.summary{background:var(--soft);border:1px solid var(--line);border-radius:10px;padding:20px;position:sticky;top:84px}
.summary h2{font-size:1.15rem}
.summary dl{display:grid;grid-template-columns:1fr auto;gap:6px 12px;margin:0 0 14px}
.summary dt{color:var(--mute)}.summary dd{margin:0;text-align:right}
.summary .total{font-weight:700;font-size:1.15rem;border-top:1px solid var(--line);padding-top:8px}
.summary .btn{width:100%;text-align:center}
.summary .hint{font-size:.88rem;color:var(--mute);margin:10px 0 0}
.summary ul{list-style:none;padding:0;margin:0 0 12px;font-size:.92rem}
.summary li{display:flex;justify-content:space-between;gap:10px;padding:4px 0;border-bottom:1px dashed var(--line)}
.empty{padding:40px 0 60px;text-align:center}
.form{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.form label{display:flex;flex-direction:column;gap:4px;font-size:.9rem;font-weight:600;color:var(--mute)}
.form input,.form select,.form textarea{font:inherit;font-size:1rem;padding:10px 12px;border:1px solid var(--line);border-radius:6px;background:#fff;color:var(--ink)}
.form input:focus,.form select:focus,.form textarea:focus{outline:2px solid var(--acc);outline-offset:1px}
.form .full{grid-column:1/-1}
.form h2{grid-column:1/-1;font-size:1.15rem;margin:14px 0 0}
.form h2:first-child{margin-top:0}
.form .check{flex-direction:row;align-items:flex-start;gap:10px;font-weight:400;color:var(--ink)}
.hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
.msg-ok{background:var(--ok-bg);border:1px solid #b9dfc5;color:var(--ok);border-radius:8px;padding:12px 16px;font-weight:600}
.msg-err{background:var(--err-bg);border:1px solid #f1b8b8;color:var(--err);border-radius:8px;padding:12px 16px}
.pay-box{margin-top:22px;border:1px solid var(--line);border-radius:10px;padding:20px;background:#fff}
.pay-box h2{font-size:1.15rem}
#paypal-buttons{max-width:420px;min-height:48px}
.pay-note{font-size:.85rem;color:var(--mute)}
.complete dl{display:grid;grid-template-columns:auto 1fr;gap:6px 18px}
.complete dt{color:var(--mute)}.complete dd{margin:0}
@media (max-width:900px){.cart-layout{grid-template-columns:1fr}.summary{position:static}.form{grid-template-columns:1fr}}

/* human dentistry ----------------------------------------------------------- */
.hd-notice{background:var(--warn-bg);border-bottom:1px solid var(--warn-line);color:var(--warn);text-align:center;padding:9px 16px;font-size:.88rem;font-weight:600}
.hd-hero{padding:44px 0 40px}
.hd-hero .wrap{display:grid;grid-template-columns:1.1fr .9fr;gap:36px;align-items:start}
.hd-hero img{width:100%;max-height:520px;object-fit:contain;background:#fff;border-radius:10px;border:1px solid var(--line)}
.hd-eyebrow{color:var(--warn)}
.hd-buy{margin:22px 0 0}
.hd-buy>summary{list-style:none;display:inline-block}
.hd-buy>summary::-webkit-details-marker{display:none}
.hd-panel{margin-top:16px;border-left:4px solid var(--warn);background:#fffaf0;border-radius:0 10px 10px 0;padding:18px 20px}
.hd-panel h2{font-size:1.25rem;color:var(--warn)}
.hd-actions{display:flex;flex-wrap:wrap;gap:12px;margin:6px 0 14px}
@media (max-width:900px){.hd-hero .wrap{grid-template-columns:1fr}}

/* footer -------------------------------------------------------------------- */
.site-footer{margin-top:40px;border-top:1px solid var(--line);background:var(--soft);font-size:.92rem;color:var(--mute)}
.footer-grid{display:grid;grid-template-columns:1fr 1fr 1.4fr;gap:28px;padding:36px 20px 20px}
.footer-grid h2{font-size:.85rem;letter-spacing:.08em;text-transform:uppercase;color:var(--ink);margin:0 0 10px}
.footer-grid ul{list-style:none;padding:0;margin:0}
.footer-grid li{padding:3px 0}
.footer-grid a{color:var(--ink)}
.footer-legal{border-top:1px solid var(--line);padding:16px 20px 28px;font-size:.82rem}
.footer-legal p{margin:0 0 6px}
@media (max-width:900px){.footer-grid{grid-template-columns:1fr}}
@media print{.site-header,.notice,.site-footer,.menu-btn{display:none}}