/* 基础色彩、排版与键盘访问 */
:root{--navy:#172c3c;--navy-deep:#102331;--red:#b04638;--paper:#f6f5f1;--white:#fff;--ink:#202d34;--text:#46535a;--line:#cbd1d1}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);background:var(--paper);font-family:Arial,"Microsoft YaHei",sans-serif;font-size:16px;line-height:1.7;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}button{font:inherit}.wrap{width:min(1200px,calc(100% - 96px));margin:0 auto}.skip-link{position:absolute;top:-80px;left:16px;z-index:20;background:white;color:var(--navy);padding:10px 16px}.skip-link:focus{top:8px}a:focus-visible,button:focus-visible{outline:3px solid #df9a64;outline-offset:4px}
/* 精简导航和清晰的首屏产品索引 */
.header{background:var(--white);border-bottom:1px solid #e2e5e4}.header-inner{min-height:88px;display:flex;align-items:center;gap:32px}.brand{display:flex;align-items:center;gap:12px;flex-shrink:0}.brand-mark{font-family:Georgia,serif;font-weight:bold;font-size:36px;line-height:1;color:var(--navy)}.brand-mark span{color:var(--red)}.brand-name{font-size:16px;font-weight:700;line-height:1.3;letter-spacing:.04em}.brand-name small{display:block;font-size:9px;letter-spacing:.12em;color:#56636a;margin-top:4px}.nav{display:flex;align-items:center;gap:32px;margin-left:auto}.nav a,.language,.menu-toggle{font-size:14px;font-weight:600}.nav a{display:flex;align-items:center;min-height:44px;transition:color .2s}.nav a:hover,.nav a:active{color:var(--red)}.language,.menu-toggle{min-width:44px;min-height:44px;border:0;background:transparent;color:var(--navy);cursor:pointer}.language{border-left:1px solid #d9dfdf;padding-left:22px}.menu-toggle{display:none}.hero{background:var(--navy);color:white}.hero-layout{display:flex;min-height:510px;align-items:stretch}.hero-main{flex:1;padding:94px 70px 88px 0}.kicker,.section-number{font-size:12px;font-weight:700;letter-spacing:.12em}.kicker{color:#e1b4a6;margin:0 0 28px}.hero h1{font-size:clamp(38px,4.6vw,62px);line-height:1.25;letter-spacing:.01em;margin:0;font-weight:600}.hero-description{max-width:570px;margin:24px 0 0;color:#e0e7e8;font-size:17px;line-height:1.8}.button{display:inline-flex;align-items:center;justify-content:space-between;gap:56px;min-height:50px;padding:11px 18px;margin-top:32px;background:#f9f8f4;color:var(--navy-deep);font-size:14px;font-weight:700;transition:background .2s}.button:hover{background:#e8d4ca}.hero-index{width:34%;max-width:390px;padding:57px 0 48px 46px;border-left:1px solid #5d6c74}.hero-index>p{color:#b9c6cb;font-size:12px;letter-spacing:.12em;margin:0 0 20px}.hero-index ol{list-style:none;margin:0;padding:0}.hero-index li{border-top:1px solid #60717b}.hero-index li:last-child{border-bottom:1px solid #60717b}.hero-index a{min-height:57px;display:flex;align-items:center;gap:23px;font-size:14px;transition:color .2s}.hero-index a:hover{color:#e8b6a7}.hero-index a span:first-child{font:12px Georgia,serif;color:#bac8cc}.hero-base{border-top:1px solid #5d6c74}.hero-base-inner{min-height:45px;display:flex;align-items:center;justify-content:space-between;gap:20px;color:#d2dadd;font-size:10px;letter-spacing:.1em}
/* 以产品、采购地区与应用场景为内容主体 */
.section{padding:96px 0}.section-layout{display:flex;gap:80px}.section-heading{flex:0 0 30%}.section-number{color:#7d4840;margin:0 0 18px}.section-number span{color:#a8b0af;padding:0 5px}.section h2{font-size:clamp(30px,3vw,40px);line-height:1.3;margin:0;font-weight:600}.about-content,.approach-content{flex:1;max-width:750px}.about-content p,.approach-content p{color:var(--text)}.lead{font-size:22px;line-height:1.65;color:var(--ink)!important;margin:0 0 20px}.about-content p:last-child{margin:0}.products{background:#fff}.products-top{display:flex;justify-content:space-between;align-items:flex-end;gap:48px;margin-bottom:48px}.products-top p:last-child{max-width:450px;color:var(--text);margin:0}.catalogue-head{display:flex;border-top:2px solid var(--navy);border-bottom:1px solid var(--line);padding:13px 0;color:#58676d;font-size:12px;font-weight:700;letter-spacing:.08em}.catalogue-head span:first-child{width:42%}.product{display:flex;gap:28px;border-bottom:1px solid var(--line);padding:34px 0;scroll-margin-top:24px}.product-title{display:flex;gap:26px;width:42%;flex-shrink:0}.product-number{font:italic 15px Georgia,serif;color:#985348;padding-top:5px}.product h3{font-size:21px;line-height:1.45;margin:0;font-weight:600}.product-info{flex:1;min-width:0}.product-items{font-size:17px;line-height:1.65;margin:0 0 18px}.product-meta{display:flex;gap:20px;color:var(--text);font-size:14px;line-height:1.7;margin:6px 0}.product-meta span:first-child{flex:0 0 72px;color:#68767b;font-size:12px;font-weight:700}.approach{background:#edf0ee}.service-list{display:flex;gap:28px;margin-top:42px}.service-list>div{flex:1;border-top:2px solid var(--navy);padding-top:18px}.service-list h3{font-size:17px;margin:0 0 10px}.service-list p{font-size:15px;line-height:1.75;margin:0}.footer{background:var(--navy-deep);color:#fff;padding:32px 0}.footer-layout{display:flex;align-items:center;justify-content:space-between;gap:24px}.footer strong{font-size:14px}.footer-layout>div span{display:block;font-size:10px;letter-spacing:.1em;color:#c6d2d6}.footer p,.footer a{font-size:12px;color:#d6e0e2}.footer a{display:flex;align-items:center;min-height:44px}
/* 中小屏幕使用纵向弹性布局，避免导航和目录挤压 */
@media(max-width:900px){.wrap{width:calc(100% - 48px)}.header-inner{min-height:76px;gap:12px}.menu-toggle{display:block;margin-left:auto}.language{padding-left:12px}.nav{display:none;position:absolute;z-index:10;top:76px;left:0;right:0;background:#fff;box-shadow:0 8px 16px #1023311a;padding:12px 24px 20px;flex-direction:column;align-items:stretch;gap:0}.nav.open{display:flex}.nav a{border-bottom:1px solid #e2e5e4}.hero-main{padding:72px 35px 72px 0}.hero-index{width:38%;padding-left:28px}.section-layout{gap:40px}.service-list{flex-wrap:wrap}.service-list>div{flex:1 1 200px}}
@media(max-width:650px){.wrap{width:calc(100% - 40px)}.brand-name{font-size:14px}.brand-name small{font-size:8px}.hero-layout{flex-direction:column}.hero-main{padding:65px 0 50px}.hero h1{font-size:37px}.hero-description{font-size:16px}.hero-index{width:100%;max-width:none;border-left:0;border-top:1px solid #5d6c74;padding:25px 0 32px}.hero-index a{min-height:48px}.hero-base-inner{font-size:9px}.section{padding:68px 0}.section-layout,.products-top{flex-direction:column;gap:26px}.section-heading{flex-basis:auto}.products-top{align-items:flex-start;margin-bottom:30px}.catalogue-head span:first-child{width:100%}.catalogue-head span:last-child{display:none}.product{flex-direction:column;gap:18px;padding:28px 0}.product-title{width:100%;gap:18px}.product h3{font-size:20px}.product h3 br{display:none}.product-info{padding-left:35px}.product-items{font-size:16px}.product-meta{gap:12px}.product-meta span:first-child{flex-basis:60px}.service-list{margin-top:30px;flex-direction:column;gap:25px}.service-list>div{flex:auto}.footer-layout{align-items:flex-start;flex-direction:column;gap:12px}.footer p{margin:0}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important}}

/* 线描插画采用统一的建筑蓝与陶土红，作为内容辅助而非交互入口。 */
.trade-story{background:#e7ece8;border-bottom:1px solid #d1dbd5}.trade-story-layout{display:flex;align-items:center;gap:64px;padding-top:28px;padding-bottom:28px}.trade-story-art{flex:1.2;min-width:0}.trade-story-art img{display:block;width:100%;height:auto}.trade-story-copy{flex:.8;max-width:395px}.trade-story-rule{display:block;width:32px;height:3px;background:var(--red);margin-bottom:20px}.trade-story-label{font-size:11px;font-weight:700;letter-spacing:.14em;color:#855046;margin:0 0 10px}.trade-story-copy h2{font-size:25px;line-height:1.35;margin:0 0 14px}.trade-story-copy p:not(.trade-story-label){font-size:15px;color:var(--text);line-height:1.8;margin:0}.trade-story-copy a{display:inline-flex;align-items:center;gap:15px;min-height:44px;margin-top:12px;font-size:14px;font-weight:700;color:var(--navy)}.trade-story-copy a:hover{color:var(--red)}
.product-title{align-items:flex-start;gap:18px}.product-icon{flex:none;width:84px;height:72px;fill:none;stroke:#385b66;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;background:#f0f3ef}.product-icon .accent,.service-icon .accent{stroke:#b15343}.product-number{padding-top:6px}.service-icon{display:block;width:48px;height:48px;margin:0 0 20px;fill:none;stroke:#385b66;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}
@media(max-width:900px){.trade-story-layout{gap:30px}.product-icon{width:68px;height:60px}.product-title{gap:12px}}
@media(max-width:650px){.trade-story-layout{flex-direction:column;align-items:flex-start;gap:8px;padding-top:24px;padding-bottom:35px}.trade-story-art{width:100%}.trade-story-copy{max-width:100%}.trade-story-copy h2{font-size:23px}.trade-story-rule{margin-bottom:14px}.product-title{align-items:center;gap:14px}.product-icon{width:68px;height:58px}.product-info{padding-left:0}.service-list{gap:25px}.service-list>div{display:flex;flex-wrap:wrap;align-items:center;column-gap:16px}.service-icon{width:44px;height:44px;margin:0}.service-list h3{flex:1;margin:0}.service-list p{flex:0 0 100%;padding-left:60px;margin-top:4px}}