/* ============================================================
   SSP Robotics — shared stylesheet
   Font: Arial throughout. Distinctive "build-sheet" system:
   sharp panels, colour-bar tier markers, angled section seams,
   registration-mark corners — no default SaaS card/shadow look.
   ============================================================ */

:root{
  --ink:#1c2733;
  --navy:#0f3d66;
  --navy-2:#134d80;
  --blue:#1668b0;
  --blue-2:#2e86d8;
  --paper:#f5f7fa;
  --card:#ffffff;
  --line:#dfe4ea;
  --orange:#f7941d;
  --orange-dark:#d97b0a;
  --yellow:#ffc93c;
  --muted:#5c6773;
  --danger:#c8402f;
  --ok:#1f8a4c;
  --radius:4px;
  --maxw:1240px;
  --font:Arial, Helvetica, sans-serif;
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:var(--font);
  color:var(--ink);
  background:var(--paper);
  line-height:1.6;
}
img,svg{display:block;max-width:100%;}
a{color:inherit;text-decoration:none;}
h1,h2,h3,h4{font-family:var(--font);margin:0;line-height:1.2;font-weight:700;}
p{margin:0;}
button{font-family:inherit;cursor:pointer;}
ul{margin:0;padding:0;list-style:none;}
:focus-visible{outline:2px solid var(--orange);outline-offset:2px;}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 28px;}
@media (prefers-reduced-motion: reduce){*{animation-duration:.001ms !important;transition-duration:.001ms !important;}}

/* ---------- registration marks (corner cross ticks) ---------- */
.reg-mark{position:absolute;width:14px;height:14px;pointer-events:none;opacity:.55;}
.reg-mark::before,.reg-mark::after{content:"";position:absolute;background:currentColor;}
.reg-mark::before{left:6px;top:0;width:2px;height:14px;}
.reg-mark::after{top:6px;left:0;width:14px;height:2px;}
.reg-mark.tl{top:14px;left:14px;} .reg-mark.tr{top:14px;right:14px;}
.reg-mark.bl{bottom:14px;left:14px;} .reg-mark.br{bottom:14px;right:14px;}

/* ---------- utility bar ---------- */
.utility-bar{background:var(--navy);color:#dbe8f4;font-size:13px;}
.utility-bar .wrap{display:flex;justify-content:space-between;align-items:center;padding:7px 28px;gap:16px;flex-wrap:wrap;}
.utility-bar a:hover{color:var(--yellow);}
.utility-left{display:flex;gap:22px;flex-wrap:wrap;}

/* ---------- header ---------- */
header.site{position:sticky;top:0;z-index:60;background:#fff;border-bottom:3px solid var(--orange);}
.header-row{display:flex;align-items:center;gap:26px;padding:14px 28px;}
.brand{display:flex;align-items:center;gap:10px;flex-shrink:0;}
.brand-mark{width:36px;height:36px;}
.brand-text{font-weight:800;font-size:19px;letter-spacing:-.01em;}
.brand-text span{color:var(--orange-dark);}
nav.main-nav{display:flex;gap:4px;flex:1;}
nav.main-nav > a{font-weight:700;font-size:14.5px;padding:10px 12px;border-bottom:3px solid transparent;color:var(--ink);}
nav.main-nav > a:hover, nav.main-nav > a.active{border-bottom-color:var(--navy);color:var(--navy);}
.header-actions{display:flex;align-items:center;gap:6px;}
.icon-btn{display:flex;align-items:center;justify-content:center;width:40px;height:40px;border-radius:50%;border:none;background:none;position:relative;color:var(--ink);}
.icon-btn:hover{background:var(--paper);}
.cart-count{position:absolute;top:2px;right:2px;background:var(--orange);color:#fff;font-size:10px;font-weight:700;min-width:16px;height:16px;border-radius:8px;display:flex;align-items:center;justify-content:center;padding:0 3px;}
.search-wrap{position:relative;flex:0 0 250px;}
.search-wrap input{width:100%;padding:9px 14px 9px 34px;border:1.5px solid var(--line);border-radius:20px;background:#fff;font-family:var(--font);font-size:14px;color:var(--ink);}
.search-wrap input:focus{border-color:var(--navy);}
.search-wrap svg{position:absolute;left:10px;top:50%;transform:translateY(-50%);width:15px;height:15px;color:var(--muted);}
.burger{display:none;background:none;border:none;padding:8px;}
@media (max-width:1020px){nav.main-nav{display:none;} .search-wrap{display:none;} .burger{display:flex;}}
.mobile-nav{display:none;flex-direction:column;padding:6px 28px 18px;border-top:1px solid var(--line);gap:2px;}
.mobile-nav.open{display:flex;}
.mobile-nav a{padding:11px 0;font-weight:700;border-bottom:1px solid var(--line);}
.mobile-nav .search-wrap{display:block;margin:10px 0;flex:none;}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 22px;border-radius:var(--radius);font-weight:700;font-size:14.5px;border:2px solid transparent;transition:background .12s ease,color .12s ease,border-color .12s ease;}
.btn:active{transform:translateY(1px);}
.btn-primary{background:var(--orange);color:#fff;border-color:var(--orange);}
.btn-primary:hover{background:var(--orange-dark);border-color:var(--orange-dark);}
.btn-dark{background:var(--navy);color:#fff;border-color:var(--navy);}
.btn-dark:hover{background:#0a2c4c;}
.btn-outline{background:transparent;border-color:var(--navy);color:var(--navy);}
.btn-outline:hover{background:var(--navy);color:#fff;}
.btn-outline-light{background:transparent;border-color:#dcebfa;color:#fff;}
.btn-outline-light:hover{background:#fff;color:var(--navy);}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--line);}
.btn-ghost:hover{border-color:var(--navy);color:var(--navy);}
.btn-block{width:100%;}
.btn-sm{padding:8px 14px;font-size:13px;}
.btn[disabled]{opacity:.45;cursor:not-allowed;}

/* ---------- section shells ---------- */
section{padding:64px 0;}
.section-head{display:flex;justify-content:space-between;align-items:flex-end;gap:20px;margin-bottom:32px;flex-wrap:wrap;}
.section-head h2{font-size:27px;}
.section-head p{color:var(--muted);margin-top:8px;max-width:56ch;}
.kicker{font-size:13px;color:var(--orange-dark);font-weight:700;margin-bottom:8px;display:block;}
.tag-strip{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
.tag-strip .wrap{display:flex;justify-content:space-between;padding:20px 28px;flex-wrap:wrap;gap:18px 30px;}
.tag-item{display:flex;align-items:center;gap:10px;font-size:14px;font-weight:600;padding-left:16px;border-left:2px solid var(--line);}
.tag-item:first-child{padding-left:0;border-left:none;}
.tag-item svg{width:18px;height:18px;color:var(--orange);flex-shrink:0;}
@media (max-width:900px){.tag-item{border-left:none;padding-left:0;}}

/* ---------- page header banner (for inner pages) ---------- */
.page-banner{background:var(--navy);color:#fff;padding:46px 0;position:relative;overflow:hidden;clip-path:polygon(0 0,100% 0,100% 88%,0 100%);}
.page-banner .wrap{position:relative;z-index:1;}
.page-banner .crumb{font-size:13px;color:#a9c4de;margin-bottom:10px;}
.page-banner .crumb a:hover{color:var(--yellow);}
.page-banner h1{font-size:32px;color:#fff;max-width:26ch;}
.page-banner p{margin-top:10px;color:#cfe0f3;max-width:56ch;font-size:15px;}

/* ---------- panel cards (no uniform shadow look) ---------- */
.panel-card{background:var(--card);border:1px solid var(--line);border-left:4px solid var(--line);border-radius:0 var(--radius) var(--radius) 0;padding:22px;transition:border-color .12s ease;}
.panel-card:hover{border-left-color:var(--orange);}

/* ---------- categories ---------- */
.cat-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:16px;}
@media (max-width:980px){.cat-grid{grid-template-columns:repeat(3,1fr);}}
@media (max-width:620px){.cat-grid{grid-template-columns:repeat(2,1fr);}}
.cat-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px 16px;text-align:left;display:flex;flex-direction:column;gap:10px;border-top:3px solid var(--line);}
.cat-card:hover{border-top-color:var(--navy);}
.cat-card svg{width:26px;height:26px;color:var(--blue);}
.cat-card-img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:3px;margin-bottom:4px;}
.cat-card b{font-size:15px;}
.cat-card span{font-size:12.5px;color:var(--muted);}

/* ---------- toolbar / chips ---------- */
.shop-toolbar{display:flex;gap:14px;flex-wrap:wrap;align-items:center;justify-content:space-between;padding:16px 0;border-bottom:1px solid var(--line);margin-bottom:26px;}
.chip-row{display:flex;gap:8px;flex-wrap:wrap;}
.chip{padding:7px 15px;border:1.5px solid var(--line);border-radius:16px;font-size:13px;font-weight:600;background:#fff;color:var(--ink);}
.chip.active{background:var(--navy);border-color:var(--navy);color:#fff;}
.sort-select{padding:8px 12px;border:1.5px solid var(--line);border-radius:var(--radius);background:#fff;font-size:13px;font-family:var(--font);}

/* ---------- product grid + cards ---------- */
.product-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
@media (max-width:980px){.product-grid{grid-template-columns:repeat(2,1fr);}}
@media (max-width:640px){.product-grid{grid-template-columns:1fr;}}
.product-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);display:flex;flex-direction:column;overflow:hidden;position:relative;transition:box-shadow .15s ease;}
.product-card:hover{box-shadow:0 10px 24px rgba(15,61,102,.12);}
.product-media{aspect-ratio:4/3;background:linear-gradient(135deg,var(--blue),var(--navy));position:relative;display:flex;align-items:center;justify-content:center;overflow:hidden;}
.product-media svg{width:56%;height:56%;color:#eaf2fb;}
.product-media img{width:100%;height:100%;object-fit:cover;display:block;}
.tier-bar{position:absolute;top:0;left:0;right:0;height:6px;}
.tier-bar.tier-Beginner{background:var(--blue-2);} .tier-bar.tier-Intermediate{background:var(--yellow);}
.tier-bar.tier-Advanced{background:var(--orange);} .tier-bar.tier-School{background:var(--navy);}
.wishlist-dot{position:absolute;top:12px;right:12px;width:30px;height:30px;border-radius:50%;background:rgba(255,255,255,.92);display:flex;align-items:center;justify-content:center;border:none;}
.wishlist-dot svg{width:16px;height:16px;color:var(--ink);}
.product-body{padding:16px;display:flex;flex-direction:column;gap:7px;flex:1;}
.product-meta-row{display:flex;justify-content:space-between;font-size:12px;color:var(--muted);font-weight:600;}
.product-title{font-size:16.5px;font-weight:700;}
.product-title:hover{color:var(--navy);}
.product-tag{font-size:13px;color:var(--muted);}
.stars{display:flex;align-items:center;gap:6px;font-size:12.5px;color:var(--muted);}
.stars .star-icons{color:var(--yellow);letter-spacing:1px;}
.price-row{display:flex;align-items:baseline;gap:8px;margin-top:2px;}
.price{font-size:19px;font-weight:800;}
.mrp{font-size:13px;color:var(--muted);text-decoration:line-through;}
.save{font-size:12px;color:var(--ok);font-weight:700;}
.product-actions{display:flex;gap:8px;margin-top:auto;padding-top:10px;}
.empty-state{padding:60px 20px;text-align:center;color:var(--muted);border:1px dashed var(--line);border-radius:var(--radius);}

/* ---------- feature band ---------- */
.feature-band{background:var(--navy);color:#eaf2fb;}
.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px;}
@media (max-width:900px){.feature-grid{grid-template-columns:1fr;}}
.feature-item{border-left:2px solid #1d5c93;padding-left:20px;}
.feature-item svg{width:24px;height:24px;color:var(--yellow);margin-bottom:14px;}
.feature-item h3{font-size:18px;color:#fff;margin-bottom:8px;}
.feature-item p{color:#bcd4ec;font-size:14.5px;}

/* ---------- split layout ---------- */
.split{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center;}
@media (max-width:900px){.split{grid-template-columns:1fr;}}

/* ---------- product detail ---------- */
.pd-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;}
@media (max-width:800px){.pd-grid{grid-template-columns:1fr;}}
.pd-media{background:linear-gradient(135deg,var(--blue),var(--navy));border-radius:var(--radius);overflow:hidden;aspect-ratio:4/3;display:flex;align-items:center;justify-content:center;}
.pd-media img{width:100%;height:100%;object-fit:cover;display:block;}
.pd-media .pd-icon-fallback{width:60%;color:#eaf2fb;}

.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:40px;align-items:center;}
@media (max-width:800px){.hero-grid{grid-template-columns:1fr;}}

.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:start;}
@media (max-width:800px){.contact-grid{grid-template-columns:1fr;}}

.cart-page-grid{display:grid;grid-template-columns:1.6fr 1fr;gap:36px;align-items:start;}
@media (max-width:800px){.cart-page-grid{grid-template-columns:1fr;}}
.checklist li{display:flex;gap:10px;padding:9px 0;border-bottom:1px solid var(--line);font-size:14.5px;}
.checklist li svg{width:18px;height:18px;color:var(--orange);flex-shrink:0;margin-top:2px;}

/* ---------- reviews ---------- */
.review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
@media (max-width:900px){.review-grid{grid-template-columns:1fr;}}
.review-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px;display:flex;flex-direction:column;gap:10px;border-top:3px solid var(--yellow);}
.review-head{display:flex;justify-content:space-between;align-items:center;}
.review-name{font-weight:700;font-size:14.5px;}
.review-role{font-size:12px;color:var(--muted);}
.review-body{font-size:14px;color:#2c352d;}

/* ---------- bulk band ---------- */
.bulk-band{background:linear-gradient(120deg,var(--blue) 0%,var(--navy) 100%);color:#fff;border-radius:var(--radius);padding:44px;display:grid;grid-template-columns:1.2fr 1fr;gap:40px;align-items:center;position:relative;}
@media (max-width:900px){.bulk-band{grid-template-columns:1fr;padding:30px;}}
.bulk-band h2{color:#fff;font-size:26px;max-width:20ch;}
.bulk-band p{color:#cfe0f3;margin-top:12px;max-width:50ch;}
.inquiry-form{background:#fff;border-radius:var(--radius);padding:22px;color:var(--ink);}
.inquiry-form h3{font-size:16px;margin-bottom:14px;}
.field{margin-bottom:12px;}
.field label{display:block;font-size:12.5px;font-weight:700;margin-bottom:5px;color:var(--muted);}
.field input,.field select,.field textarea{width:100%;padding:10px 12px;border:1.5px solid var(--line);border-radius:var(--radius);font-family:var(--font);font-size:14px;}
.field input:focus,.field select:focus,.field textarea:focus{border-color:var(--navy);}
.field textarea{resize:vertical;min-height:70px;}
.form-msg{font-size:13.5px;padding:10px 12px;border-radius:var(--radius);margin-top:10px;display:none;}
.form-msg.show{display:block;}
.form-msg.ok{background:#e3f4e9;color:var(--ok);}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:12px;}
@media (max-width:520px){.grid-2{grid-template-columns:1fr;}}

/* ---------- FAQ ---------- */
.faq-item{border-bottom:1px solid var(--line);}
.faq-q{width:100%;text-align:left;background:none;border:none;padding:18px 0;display:flex;justify-content:space-between;align-items:center;font-family:var(--font);font-weight:700;font-size:15.5px;color:var(--ink);}
.faq-q svg{width:18px;height:18px;flex-shrink:0;transition:transform .15s ease;color:var(--orange);}
.faq-item.open .faq-q svg{transform:rotate(45deg);}
.faq-a{max-height:0;overflow:hidden;transition:max-height .2s ease;}
.faq-item.open .faq-a{max-height:260px;}
.faq-a p{padding:0 0 18px;color:var(--muted);font-size:14.5px;max-width:70ch;}
.faq-cat-row{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:22px;}

/* ---------- newsletter ---------- */
.newsletter{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:32px;display:flex;justify-content:space-between;align-items:center;gap:24px;flex-wrap:wrap;}
.newsletter form{display:flex;gap:10px;flex-wrap:wrap;}
.newsletter input{padding:11px 14px;border:1.5px solid var(--line);border-radius:var(--radius);min-width:230px;font-family:var(--font);}

/* ---------- blog ---------- */
.blog-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
@media (max-width:980px){.blog-grid{grid-template-columns:repeat(2,1fr);}}
@media (max-width:640px){.blog-grid{grid-template-columns:1fr;}}
.blog-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column;}
.blog-media{height:130px;background:repeating-linear-gradient(135deg,var(--navy),var(--navy) 10px,var(--blue) 10px,var(--blue) 20px);position:relative;overflow:hidden;}
.blog-media img{width:100%;height:100%;object-fit:cover;display:block;}
.blog-cat{position:absolute;bottom:10px;left:14px;background:#fff;color:var(--navy);font-size:11.5px;font-weight:700;padding:4px 9px;border-radius:3px;}
.blog-body{padding:18px;display:flex;flex-direction:column;gap:8px;flex:1;}
.blog-meta{font-size:12px;color:var(--muted);}
.blog-title{font-size:16.5px;font-weight:700;}
.blog-title:hover{color:var(--navy);}
.blog-excerpt{font-size:13.5px;color:var(--muted);}

/* ---------- team ---------- */
.team-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;}
@media (max-width:900px){.team-grid{grid-template-columns:repeat(2,1fr);}}
@media (max-width:560px){.team-grid{grid-template-columns:1fr;}}
.team-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:20px;}
.team-avatar{width:52px;height:52px;border-radius:50%;background:var(--navy);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:17px;margin-bottom:12px;}
.team-card h4{font-size:15px;}
.team-role{font-size:12.5px;color:var(--orange-dark);font-weight:700;margin:4px 0 8px;}
.team-bio{font-size:13.5px;color:var(--muted);}

/* ---------- stat band ---------- */
.stat-band{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
.stat-grid{display:grid;grid-template-columns:repeat(4,1fr);}
@media (max-width:700px){.stat-grid{grid-template-columns:repeat(2,1fr);}}
.stat-item{padding:28px;border-left:1px solid var(--line);text-align:center;}
.stat-item:first-child{border-left:none;}
.stat-item b{display:block;font-size:30px;color:var(--navy);}
.stat-item span{font-size:12.5px;color:var(--muted);}

/* ---------- footer ---------- */
footer.site{background:var(--navy);color:#cfe0f3;padding:56px 0 0;}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:32px;padding-bottom:40px;border-bottom:1px solid #1d5c93;}
@media (max-width:900px){.footer-grid{grid-template-columns:1fr 1fr;}}
.footer-grid h4{color:#fff;font-size:14px;margin-bottom:14px;}
.footer-grid ul li{padding:5px 0;font-size:13.5px;}
.footer-grid ul li a:hover{color:var(--yellow);}
.footer-brand p{font-size:13.5px;color:#a9c4de;margin-top:12px;max-width:34ch;}
.footer-social{display:flex;gap:10px;margin-top:16px;}
.footer-social a{width:32px;height:32px;border:1px solid #1d5c93;border-radius:50%;display:flex;align-items:center;justify-content:center;}
.footer-social svg{width:15px;height:15px;}
.footer-bottom{display:flex;justify-content:space-between;padding:20px 0;font-size:12.5px;color:#7fa0c2;flex-wrap:wrap;gap:10px;}

/* ---------- drawer / cart ---------- */
.overlay{position:fixed;inset:0;background:rgba(10,20,30,.5);z-index:90;opacity:0;pointer-events:none;transition:opacity .18s ease;}
.overlay.show{opacity:1;pointer-events:auto;}
.drawer{position:fixed;top:0;right:0;height:100%;width:420px;max-width:92vw;background:#fff;z-index:95;box-shadow:-8px 0 30px rgba(0,0,0,.15);transform:translateX(100%);transition:transform .22s ease;display:flex;flex-direction:column;}
.drawer.show{transform:translateX(0);}
.drawer-head{display:flex;justify-content:space-between;align-items:center;padding:18px 20px;border-bottom:1px solid var(--line);}
.drawer-head h3{font-size:18px;}
.drawer-close{background:none;border:none;width:32px;height:32px;display:flex;align-items:center;justify-content:center;}
.drawer-close svg{width:18px;height:18px;}
.drawer-body{flex:1;overflow-y:auto;padding:16px 20px;}
.cart-line{display:flex;gap:12px;padding:14px 0;border-bottom:1px solid var(--line);}
.cart-thumb{width:64px;height:64px;border-radius:var(--radius);background:linear-gradient(135deg,var(--blue),var(--navy));flex-shrink:0;display:flex;align-items:center;justify-content:center;overflow:hidden;}
.cart-thumb svg{width:60%;height:60%;color:#eaf2fb;}
.cart-thumb img{width:100%;height:100%;object-fit:cover;}
.cart-line-info{flex:1;display:flex;flex-direction:column;gap:4px;}
.cart-line-title{font-size:14px;font-weight:700;}
.cart-line-price{font-size:13.5px;color:var(--muted);}
.qty-row{display:flex;align-items:center;gap:10px;margin-top:4px;}
.qty-btn{width:24px;height:24px;border:1.5px solid var(--line);background:#fff;border-radius:3px;display:flex;align-items:center;justify-content:center;font-size:14px;}
.qty-val{font-size:13.5px;min-width:16px;text-align:center;font-weight:700;}
.remove-line{font-size:12px;color:var(--danger);margin-left:auto;background:none;border:none;text-decoration:underline;}
.drawer-foot{border-top:1px solid var(--line);padding:18px 20px;display:flex;flex-direction:column;gap:12px;}
.foot-row{display:flex;justify-content:space-between;font-size:14.5px;}
.foot-row.total{font-weight:800;font-size:17px;}
.empty-cart{text-align:center;padding:60px 10px;color:var(--muted);}
.empty-cart svg{width:44px;height:44px;margin:0 auto 14px;color:var(--line);}

/* ---------- modal ---------- */
.modal{position:fixed;inset:0;z-index:100;display:flex;align-items:flex-start;justify-content:center;padding:40px 16px;overflow-y:auto;opacity:0;pointer-events:none;transition:opacity .18s ease;}
.modal.show{opacity:1;pointer-events:auto;}
.modal-card{background:#fff;border-radius:var(--radius);max-width:960px;width:100%;position:relative;margin:auto 0;}
.modal-close{position:absolute;top:14px;right:14px;width:34px;height:34px;border-radius:50%;background:var(--paper);border:none;display:flex;align-items:center;justify-content:center;z-index:2;}
.modal-close svg{width:16px;height:16px;}

/* ---------- toast ---------- */
.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%) translateY(20px);background:var(--navy);color:#fff;padding:13px 22px;border-radius:24px;font-size:14px;z-index:120;opacity:0;pointer-events:none;transition:all .2s ease;display:flex;align-items:center;gap:8px;}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0);}
.toast svg{width:16px;height:16px;color:var(--yellow);}

.skip-link{position:absolute;left:-999px;top:0;background:#fff;padding:10px 16px;z-index:200;}
.skip-link:focus{left:10px;top:10px;}

/* ---------- breadcrumb ---------- */
.crumbs{font-size:13px;color:var(--muted);margin-bottom:18px;}
.crumbs a:hover{color:var(--navy);}

/* ---------- individual blog articles ---------- */
.article-section{padding:48px 0 64px;}
.article-layout{display:grid;grid-template-columns:minmax(0,700px) 310px;gap:60px;justify-content:center;align-items:start;}
@media (max-width:980px){.article-layout{grid-template-columns:minmax(0,700px);gap:36px;}}
.article-cover{width:100%;height:auto;border-radius:var(--radius);border:1px solid var(--line);margin-bottom:28px;}
.article-lead{font-size:18px;line-height:1.65;color:var(--ink);border-left:4px solid var(--orange);padding-left:18px;margin-bottom:30px;}
.article-body{font-size:16px;line-height:1.8;}
.article-body h2{font-size:25px;margin:44px 0 14px;scroll-margin-top:96px;}
.article-body h2::before{content:"";display:block;width:34px;height:4px;background:var(--orange);margin-bottom:12px;}
.article-body h3{font-size:18px;margin:28px 0 8px;color:var(--navy);}
.article-body p{margin-bottom:18px;}
.article-body a:not(.btn){color:var(--blue);font-weight:700;border-bottom:1.5px solid rgba(22,104,176,.3);}
.article-body a:not(.btn):hover{color:var(--navy);border-bottom-color:var(--orange);}
.article-body ul,.article-body ol{margin:0 0 22px;padding:0;}
.article-body ul li{position:relative;padding:5px 0 5px 24px;}
.article-body ul li::before{content:"";position:absolute;left:2px;top:15px;width:8px;height:8px;background:var(--orange);}
.article-body ol{counter-reset:step;list-style:none;}
.article-body ol li{position:relative;padding:6px 0 6px 40px;counter-increment:step;}
.article-body ol li::before{content:counter(step);position:absolute;left:0;top:7px;width:26px;height:26px;background:var(--navy);color:#fff;font-size:13px;font-weight:700;display:flex;align-items:center;justify-content:center;border-radius:3px;}
.article-body strong{color:var(--ink);}

.formula{background:var(--navy);color:#fff;border-radius:var(--radius);padding:26px;margin:26px 0;text-align:center;position:relative;}
.formula b{display:block;font-size:34px;letter-spacing:.04em;color:var(--yellow);}
.formula span{display:block;margin-top:8px;font-size:13.5px;color:#bcd4ec;}

.callout{background:var(--card);border:1px solid var(--line);border-left:4px solid var(--orange);border-radius:0 var(--radius) var(--radius) 0;padding:18px 22px;margin:26px 0;}
.callout.info{border-left-color:var(--blue-2);}
.callout-title{display:block;font-size:12.5px;font-weight:700;color:var(--orange-dark);margin-bottom:6px;}
.callout.info .callout-title{color:var(--blue);}
.callout p:last-child,.callout ul:last-child,.callout ol:last-child{margin-bottom:0;}
.callout p{font-size:15px;line-height:1.7;margin-bottom:10px;}

.article-figure{margin:28px 0;background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;}
.article-figure img{width:100%;height:auto;max-height:440px;object-fit:contain;background:#fff;padding:14px;}
.article-figure.tall img{max-width:340px;margin:0 auto;}
.article-figure figcaption{font-size:13px;color:var(--muted);padding:10px 16px;border-top:1px solid var(--line);background:var(--paper);line-height:1.5;}

.article-body table{width:100%;border-collapse:collapse;margin:24px 0;font-size:14.5px;line-height:1.5;background:#fff;border:1px solid var(--line);}
.article-body th{background:var(--navy);color:#fff;text-align:left;padding:10px 14px;font-size:13px;}
.article-body td{padding:10px 14px;border-top:1px solid var(--line);vertical-align:top;}
.article-body tr:nth-child(even) td{background:var(--paper);}
.table-scroll{overflow-x:auto;margin:24px 0;}
.table-scroll table{margin:0;min-width:520px;}

.article-body pre{background:#0c2b48;color:#e6f0fa;border-radius:var(--radius);padding:18px 20px;overflow-x:auto;margin:24px 0;font-size:13.5px;line-height:1.65;border-top:4px solid var(--orange);}
.article-body pre code{font-family:"Courier New",Courier,monospace;}
.article-body code{font-family:"Courier New",Courier,monospace;font-size:.92em;background:#e8eef5;padding:1px 6px;border-radius:3px;}
.article-body pre code{background:none;padding:0;}

.bug-list{margin:26px 0;display:flex;flex-direction:column;gap:16px;}
.bug-card{background:#fff;border:1px solid var(--line);border-left:4px solid var(--line);border-radius:0 var(--radius) var(--radius) 0;padding:20px 22px 8px 22px;position:relative;}
.bug-card:hover{border-left-color:var(--orange);}
.bug-card h3{margin:0 0 4px;font-size:18px;color:var(--ink);}
.bug-num{font-size:12px;font-weight:700;color:var(--orange-dark);display:block;margin-bottom:4px;}
.bug-tag{display:inline-block;font-size:11.5px;font-weight:700;background:var(--paper);border:1px solid var(--line);color:var(--navy);padding:2px 8px;border-radius:3px;margin:2px 6px 10px 0;}
.bug-card p{font-size:15px;margin-bottom:12px;line-height:1.7;}

.compare-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:26px 0;}
@media (max-width:620px){.compare-grid{grid-template-columns:1fr;}}
.compare-col{background:#fff;border:1px solid var(--line);border-top:4px solid var(--blue-2);border-radius:var(--radius);padding:18px 20px 6px;}
.compare-col.alt{border-top-color:var(--orange);}
.compare-col h3{margin:0 0 8px;font-size:17px;color:var(--ink);}
.compare-col ul{margin-bottom:12px;}
.compare-col ul li{font-size:14.5px;line-height:1.6;}

.phase-list{margin:26px 0;display:flex;flex-direction:column;gap:0;border-left:3px solid var(--line);margin-left:6px;}
.phase{position:relative;padding:0 0 26px 26px;}
.phase:last-child{padding-bottom:0;}
.phase::before{content:"";position:absolute;left:-10px;top:4px;width:17px;height:17px;background:var(--orange);border:3px solid var(--paper);border-radius:50%;}
.phase h3{margin:0 0 4px;font-size:18px;color:var(--ink);}
.phase-meta{display:block;font-size:12.5px;font-weight:700;color:var(--orange-dark);margin-bottom:6px;}
.phase p{margin-bottom:8px;font-size:15.5px;}

.article-cta{background:linear-gradient(120deg,var(--blue) 0%,var(--navy) 100%);color:#fff;border-radius:var(--radius);padding:34px;margin-top:48px;display:flex;justify-content:space-between;align-items:center;gap:28px;flex-wrap:wrap;}
.article-cta > div{flex:1 1 320px;}
.article-cta .kicker{color:var(--yellow);}
.article-cta h2{font-size:23px;color:#fff;max-width:26ch;}
.article-cta p{color:#cfe0f3;margin-top:10px;font-size:15px;max-width:52ch;}

.article-side{position:sticky;top:96px;display:flex;flex-direction:column;gap:20px;}
@media (max-width:980px){.article-side{position:static;}}
.side-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;}
.toc{padding:20px 20px 12px;border-top:4px solid var(--navy);}
.toc h4{font-size:14px;margin-bottom:10px;}
.toc li a{display:block;font-size:13.5px;line-height:1.4;padding:8px 0 8px 12px;border-left:2px solid var(--line);color:var(--muted);font-weight:600;}
.toc li a:hover{color:var(--navy);border-left-color:var(--navy);}
.toc li a.active{color:var(--navy);border-left-color:var(--orange);}
.side-feature img{width:100%;aspect-ratio:4/3;object-fit:cover;}
.side-feature-body{padding:18px;display:flex;flex-direction:column;gap:8px;}
.side-feature-body h4{font-size:16px;}
.side-feature-body p{font-size:13.5px;color:var(--muted);margin-bottom:6px;}

.related-section{background:#fff;border-top:1px solid var(--line);}
.related-section .blog-card:hover{box-shadow:0 10px 24px rgba(15,61,102,.12);}