.product-identity{background:linear-gradient(180deg,#f9fbfd,#eef3f7);overflow:hidden;position:relative}.product-identity:after{content:'YIWEIYUAN PRODUCT';position:absolute;right:-34px;top:30px;transform:rotate(90deg);font-size:.65rem;letter-spacing:.18em;color:#b4bfcc}.product-identity .product-bag{width:min(100%,390px);height:auto;max-height:430px;object-fit:contain;mix-blend-mode:multiply;filter:drop-shadow(0 18px 18px rgba(22,39,73,.14));transition:transform .35s ease,filter .35s ease}.product-identity:hover .product-bag{transform:translateY(-7px) scale(1.025);filter:drop-shadow(0 24px 22px rgba(22,39,73,.2))}.product-identity strong{max-width:90%}.product-identity p{color:var(--navy);font-weight:bold;letter-spacing:.08em}.product-copy{background:#fff;padding:30px 0}.product-copy .eyebrow{margin-bottom:16px}.product-specs>div{transition:background-color .2s ease;padding-left:10px;padding-right:10px}.product-specs>div:hover{background:#f5f8ef}.product-copy .button:active{transform:translateY(1px) scale(.98)}
@media(max-width:720px){.product-identity .product-bag{max-height:350px}.product-copy{padding:5px 0}}
.related-card{padding:0;min-height:0}.related-card-visual{height:150px;background:#f5f7f9;display:flex;align-items:center;justify-content:center}.related-card-visual img{width:100%;height:100%;object-fit:contain;transition:transform .3s}.related-card:hover .related-card-visual img{transform:scale(1.06)}.related-card-copy{padding:14px 18px;display:flex;flex-direction:column}.related-card-copy h3{font-size:1rem;margin:7px 0 12px}.product-data-panel{border:1px solid var(--line);padding:22px;margin-top:24px;background:#fbfcfd}.product-data-panel h2{font-size:1.05rem;color:var(--navy);margin:0 0 12px}.product-data-panel ul{margin:0;padding-left:20px;line-height:1.9;font-size:.9rem}
.product-detail-grid{align-items:stretch}.product-identity{min-height:650px;padding:34px 28px 38px}.product-identity .product-bag{width:min(118%,520px);max-height:520px;transform:scale(1.18)}.product-identity:hover .product-bag{transform:translateY(-7px) scale(1.22)}.product-identity>span{margin-top:4px}.product-identity p{margin-top:22px}.product-copy{display:flex;flex-direction:column}.product-copy h1{font-size:clamp(2rem,3.5vw,3rem);margin-top:5px}.product-copy .actions{margin-top:auto;padding-top:24px}.product-data-panel{box-shadow:0 10px 26px #1422430b;border-left:4px solid var(--lime)}.product-detail-grid:before{content:'PRODUCT PROFILE';position:absolute;opacity:0}.detail-help{border-left:4px solid var(--navy);box-shadow:0 7px 22px #14224308}.related{padding-top:10px}.related .catalog-card{transition:transform .25s ease,box-shadow .25s ease}.related .catalog-card:hover{transform:translateY(-4px);box-shadow:0 10px 24px #14224318}
@media(max-width:720px){.product-identity{min-height:480px;padding:24px 18px}.product-identity .product-bag{width:115%;max-height:390px;transform:scale(1.12)}.product-identity:hover .product-bag{transform:scale(1.14)}}
/* Shared square product artwork: parameters left, packaging right. */
.product-art{display:block;width:100%;height:auto;aspect-ratio:1;background:#fff}
.catalog-card,.related .catalog-card{display:flex;flex-direction:column;padding:0}
.catalog-card-visual,.related-card-visual{display:block;height:auto;aspect-ratio:1;background:white;overflow:hidden}
.product-detail-grid{grid-template-columns:minmax(0,1fr) minmax(0,1.15fr);gap:32px;align-items:start}
.product-detail-grid .product-identity{padding:0;min-height:0;border:0;background:white;display:block;align-self:start;position:sticky;top:110px}
.product-identity:after,.product-detail-grid:before{display:none}
.product-identity .product-art{width:100%;height:auto}
@media(max-width:900px){.product-detail-grid{grid-template-columns:1fr}.product-detail-grid .product-identity{position:static;order:0}.product-detail-grid .product-copy{order:1}}
.buying-guide{margin:6px 0 16px}.guide-lead{font-size:16px;line-height:1.9;color:#425570}.buying-guide article{padding:20px 0;border-bottom:1px solid #dce4ef}.buying-guide article>span{font-size:11px;letter-spacing:.08em;color:#71829c}.buying-guide h2{font-size:19px;margin:8px 0;color:#243e79}.buying-guide article p{font-size:14px;line-height:1.85;margin:0}.inquiry-checklist{margin-top:22px;padding:18px;background:#edf2f9;border-left:3px solid #243e79}.inquiry-checklist strong{font-size:14px}.inquiry-checklist p{font-size:13px;margin:8px 0 0}.guide-source{display:inline-block;font-size:12px;margin-top:12px;color:#6e7e91}.phone-icon{display:inline!important;font-size:inherit!important}
.product-story-expanded{display:flex;flex-direction:column;gap:24px;margin-top:60px}.story-nav{display:flex;gap:28px;padding:18px 24px;background:#243e79;color:white}.story-nav a:hover{text-decoration:underline}.product-story-expanded>article{background:white;padding:0;border:1px solid #dce4ef;scroll-margin-top:115px}.product-story-expanded header{display:flex;align-items:center;gap:22px;padding:28px 32px;background:#f1f5fa;border-bottom:1px solid #dce4ef}.story-number{font-size:42px;font-weight:700;color:#9baecb}.product-story-expanded header .eyebrow{font-size:11px;margin:0 0 8px}.product-story-expanded h2{font-size:25px;margin:0 0 8px}.product-story-expanded header p:last-child{color:#67788e;font-size:14px}.story-body{padding:28px 32px}.product-story-expanded .story-intro{font-size:15px;line-height:1.9;margin-bottom:18px}.story-rows{margin:0}.story-rows>div{display:grid;grid-template-columns:155px 1fr;gap:24px;padding:20px 0;border-bottom:1px solid #e8edf3}.story-rows dt{font-weight:600;color:#243e79}.story-rows dd{margin:0;font-size:14px;line-height:1.9;color:#53647b}.story-body aside{margin-top:22px;background:#f1f5fa;padding:16px 20px;border-left:3px solid #243e79;font-size:14px}.supply-steps{display:flex;flex-wrap:wrap;gap:30px;margin:26px 0 0;padding-left:22px;color:#243e79;font-size:14px}.story-contact{display:flex;justify-content:space-between;gap:24px;align-items:center;background:#f1f5fa;padding:24px;margin-top:26px}.story-contact p{font-size:13px;margin-top:8px}.story-contact .button{flex-shrink:0}@media(max-width:720px){.product-story-expanded{margin-top:30px}.story-nav{gap:0;justify-content:space-between;padding:16px;font-size:13px}.product-story-expanded header{padding:22px 18px;gap:15px}.story-body{padding:20px 18px}.story-rows>div{grid-template-columns:1fr;gap:8px}.story-contact{flex-direction:column;align-items:stretch;padding:18px}.supply-steps{display:grid;gap:12px}.product-story-expanded h2{font-size:22px}}
.visual-guide{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-bottom:28px;padding:26px;background:linear-gradient(120deg,#eef3fa,#f8fafc);border:1px solid #e0e7f0}.visual-guide-item svg{width:46px;height:46px;color:#29477e;display:block;margin-bottom:16px}.visual-guide-item strong{display:block;font-size:17px;color:#203966}.product-story-expanded .visual-guide-item p{font-size:13px;line-height:1.8;margin:9px 0 0;color:#61728a}.quality-visual{background:#f4f7fb}.packaging-visual{display:grid;grid-template-columns:320px 1fr;background:#f3f6fb;margin-bottom:30px;overflow:hidden;border:1px solid #e0e7f0}.packaging-photo{background:white;display:flex;align-items:center;justify-content:center}.packaging-photo img{display:block;width:100%;height:320px;object-fit:contain}.packaging-caption{padding:30px}.packaging-caption>span{font-size:11px;color:#6f819a;letter-spacing:2px}.packaging-caption h3{font-size:24px;color:#243e79;margin:14px 0}.pack-sizes{display:flex;gap:36px;margin:15px 0}.pack-sizes strong{font-size:38px;line-height:1.2;color:#243e79}.pack-sizes span{font-size:16px;margin-left:5px}.product-story-expanded .packaging-caption p{font-size:14px;max-width:500px}.pack-check{display:flex;align-items:center;gap:12px;margin:20px 0;font-size:13px;color:#243e79}.pack-check svg{width:30px;height:30px;flex-shrink:0}.packaging-caption small{font-size:12px;color:#78879a}@media(max-width:720px){.visual-guide{grid-template-columns:1fr;padding:20px;gap:22px}.visual-guide-item{display:grid;grid-template-columns:40px 1fr;column-gap:14px}.visual-guide-item svg{grid-row:1/3;width:36px;height:36px;margin:0}.visual-guide-item p{grid-column:2}.packaging-visual{grid-template-columns:1fr}.packaging-photo img{height:240px}.packaging-caption{padding:22px}.packaging-caption h3{font-size:21px}}
/* Unified, centered product chapters; isolated from the global header nav. */
.product-story-expanded>.story-nav{position:static;inset:auto;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));align-self:center;width:100%;max-width:960px;margin:0 auto 8px;padding:8px;gap:6px;border:1px solid #dce4ef;border-radius:12px;background:#f1f5fa;box-shadow:none;color:#243e79}
.product-story-expanded>.story-nav a{display:flex;justify-content:center;align-items:center;gap:10px;min-height:62px;margin:0;padding:12px 8px;border-radius:7px;font-size:17px;font-weight:600;text-align:center;white-space:nowrap}
.product-story-expanded>.story-nav .chapter-index{font-size:12px;font-weight:500;letter-spacing:.06em;color:#7186a9}
.product-story-expanded>.story-nav a:hover,.product-story-expanded>.story-nav a:focus-visible{background:#243e79;color:#fff;text-decoration:none;outline-offset:3px}
.product-story-expanded>.story-nav a:hover .chapter-index,.product-story-expanded>.story-nav a:focus-visible .chapter-index{color:#d5e1f7}
.product-story-expanded>article>header{justify-content:center;text-align:center;gap:20px;padding:32px}
.product-story-expanded>article>header .eyebrow{justify-content:center}
.product-story-expanded>article>header .story-number{font-size:34px;line-height:1;color:#7b91b7}
@media(max-width:720px){.product-story-expanded>.story-nav{grid-template-columns:repeat(2,minmax(0,1fr));padding:6px;gap:4px}.product-story-expanded>.story-nav a{min-height:54px;font-size:15px;gap:8px}.product-story-expanded>article>header{padding:24px 16px;gap:12px}.product-story-expanded>article>header .story-number{font-size:26px}}

/* Product information hierarchy: chapter navigation, section titles, topic labels. */
.product-story-expanded{gap:36px}
.product-story-expanded>.story-nav{max-width:none;padding:10px;gap:10px;background:#eaf0f8;border-color:#cdd9eb}
.product-story-expanded>.story-nav a{min-height:84px;background:#fff;border:1px solid #d4deed;border-bottom:4px solid #243e79;border-radius:6px;font-size:22px;font-weight:750;color:#1e3263;box-shadow:0 3px 10px #1e326308}
.product-story-expanded>.story-nav .chapter-index{display:grid;place-items:center;width:32px;height:32px;border-radius:50%;background:#edf2fa;color:#243e79;font-size:13px;font-weight:700;flex-shrink:0}
.product-story-expanded>article{border-radius:12px;overflow:hidden;box-shadow:0 8px 28px #1e326308}
.product-story-expanded>article>header{position:relative;background:linear-gradient(115deg,#1c2e60,#2d4d89);border-bottom:4px solid #93bd24;padding:36px 28px;gap:24px;color:#fff}
.product-story-expanded>article>header .story-number{display:grid;place-items:center;flex-shrink:0;width:66px;height:66px;border:1px solid #ffffff50;border-radius:12px;background:#ffffff12;color:#fff;font-size:32px;font-weight:700}
.product-story-expanded>article>header h2{color:#fff;font-size:clamp(26px,2.4vw,34px);font-weight:750;line-height:1.4;letter-spacing:.025em;margin:0 0 10px}
.product-story-expanded>article>header .eyebrow{color:#c9d8f2;font-size:11px;letter-spacing:.18em;margin:0 0 10px}
.product-story-expanded>article>header p:last-child{color:#d8e3f5;font-size:16px;margin:0}
.product-story-expanded .story-body{padding:32px}
.product-story-expanded .story-rows>div{grid-template-columns:200px minmax(0,1fr);gap:28px;padding:22px 0;align-items:start}
.product-story-expanded .story-rows dt{font-size:20px;font-weight:700;line-height:1.6;color:#1e3263;border-left:4px solid #4268a8;padding:5px 12px;background:#f0f4fa;border-radius:0 4px 4px 0}
.product-story-expanded .story-rows dd{padding-top:5px;color:#52627a}
.product-story-expanded .visual-guide-item strong{font-size:21px;font-weight:700;color:#1e3263}
.product-story-expanded .package-gallery-title{background:#edf2fa;color:#1e3263;border-bottom:1px solid #d4deed}
.product-story-expanded .package-gallery-title h3{font-size:24px;font-weight:700}
.product-story-expanded .story-contact strong{font-size:21px;color:#1e3263}
.product-story-expanded .knowledge-sources summary{font-size:17px;font-weight:650;color:#243e79}
@media(max-width:720px){
.product-story-expanded{gap:24px}
.product-story-expanded>.story-nav{gap:6px;padding:6px}
.product-story-expanded>.story-nav a{min-height:68px;font-size:18px;gap:7px;padding:10px 4px}
.product-story-expanded>.story-nav .chapter-index{width:26px;height:26px;font-size:11px}
.product-story-expanded>article>header{padding:26px 18px;gap:12px}
.product-story-expanded>article>header .story-number{width:42px;height:48px;font-size:23px;border-radius:8px}
.product-story-expanded>article>header h2{font-size:25px}
.product-story-expanded>article>header p:last-child{font-size:14px}
.product-story-expanded .story-body{padding:20px 18px}
.product-story-expanded .story-rows>div{grid-template-columns:1fr;gap:10px;padding:18px 0}
.product-story-expanded .story-rows dt{font-size:19px;justify-self:start;padding-right:20px}
}