/* ==========================================================================
   YC FAB 官网样式（单文件版）
   ==========================================================================
   由旧版 5 个 CSS（site / image-layout / case-showcase / visual-upgrade /
   polish）按真实级联结果合并重写，视觉与线上一致，删除全部历史覆盖与死代码。
   维护约定：修改视觉时先更新本文件，不要再叠加覆盖文件。
   ========================================================================== */

/* ---------- 变量与基础 ---------- */
:root{
  --ink:#0d1f2a;          /* 正文深色 */
  --muted:#5d6e78;        /* 次要文字 */
  --line:#d9e2e6;         /* 分隔线 */
  --soft:#f4f7f8;         /* 浅底 */
  --brand:#e65d27;        /* 品牌橙 */
  --deep:#0b1d27;         /* 深色 */
  --bg:#f5f7f8;
  --max:1180px;
  --shadow:0 16px 36px rgba(11,29,39,.08);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:86px}
body{margin:0;background:#e8eff2;color:var(--ink);font-family:Arial,"Microsoft YaHei",sans-serif;line-height:1.65}
a{text-decoration:none;color:inherit}
img{max-width:100%}

/* 无障碍：跳过导航链接 */
.skip-link{position:fixed;left:12px;top:-60px;z-index:20;background:var(--deep);color:#fff;padding:9px 14px}
.skip-link:focus{top:12px}

/* 内容容器 */
.wrap{width:min(var(--max),calc(100% - 40px));margin:auto}

/* ---------- 顶部导航 ---------- */
.nav{position:sticky;top:0;z-index:10;background:rgba(255,255,255,.91);backdrop-filter:blur(14px);border-bottom:1px solid var(--line);box-shadow:0 1px 0 rgba(10,31,42,.05)}
.nav .wrap{display:flex;align-items:center;min-height:96px;gap:22px}
.brand{display:flex;align-items:center;gap:10px;min-width:0;font-size:21px;font-weight:800;letter-spacing:.4px}
.brand img{max-width:110px;max-height:72px;object-fit:contain;display:none}
.brand.has-logo img{display:block}
.brand.has-logo .brand-text{display:none}
.brand small{display:block;font-size:11px;font-weight:600;color:var(--muted);letter-spacing:1px;white-space:nowrap}
.links{display:flex;gap:20px;margin-left:auto;font-size:14px}
.links a{position:relative;padding:36px 0}
.links a:after{content:"";position:absolute;left:0;right:0;bottom:27px;height:2px;background:var(--brand);transform:scaleX(0);transition:transform .2s}
.links a:hover:after,.links a.is-active:after{transform:scaleX(1)}
.language{white-space:nowrap;padding:8px 13px;border:1px solid var(--line);border-radius:999px;font-size:13px;transition:background .2s,border-color .2s,color .2s}
.language:hover{background:var(--deep);border-color:var(--deep);color:#fff}
.menu-toggle{display:none;margin-left:auto;width:42px;height:42px;background:#fff;border:1px solid var(--line);border-radius:4px;font-size:21px;cursor:pointer}
.nav-promo{display:flex;align-items:center;gap:12px;margin-left:8px;padding-left:17px;border-left:1px solid #dbe4e7;color:#61747d;font-size:12px;line-height:1.35;white-space:nowrap}
.nav-promo .nav-company{color:#173441;font-size:13px;font-weight:800}
.nav-promo .nav-service{padding-left:12px;border-left:1px solid #dbe4e7;color:#58707b}
.nav-promo b{color:#173441;font-size:13px;letter-spacing:.2px}

/* ---------- 首屏 Hero ---------- */
.hero{position:relative;isolation:isolate;overflow:hidden;display:flex;align-items:center;min-height:600px;padding:96px 0 84px;color:#fff;background-color:#071d28;background-image:url("images/showcase/01-hero.webp");background-size:cover;background-position:center 52%}
.hero::before{content:"";position:absolute;inset:0;z-index:-1;background:linear-gradient(90deg,rgba(4,20,29,.97) 0%,rgba(4,20,29,.88) 41%,rgba(4,20,29,.34) 100%),linear-gradient(120deg,rgba(7,38,52,.34),transparent 58%)}
.hero .wrap{max-width:1200px;padding:46px 0}
.hero h1{max-width:770px;margin:14px 0;font-size:clamp(34px,5vw,60px);line-height:1.13;letter-spacing:-.025em;text-wrap:balance}
.hero p{max-width:660px;font-size:18px;line-height:1.75;color:#d7e4e9}
.hero .eyebrow{display:flex;align-items:center;gap:11px;min-height:26px;margin:0 0 12px;padding:0;border:0;background:transparent;color:#fff;font-size:14px;font-weight:800;letter-spacing:.35px;line-height:1.35;text-transform:none;text-shadow:0 1px 1px rgba(0,0,0,.24)}
.hero .eyebrow::before{content:"";flex:0 0 42px;width:42px;height:3px;margin:0;background:var(--brand);opacity:1}

/* 子页页头（深色工业风，与全站深浅交替节奏统一） */
.page-hero{position:relative;overflow:hidden;color:#fff;background-color:#0b2531;background-image:linear-gradient(100deg,rgba(5,23,32,.97) 0%,rgba(5,23,32,.9) 55%,rgba(5,23,32,.78) 100%),url("images/showcase/08-shipping.webp");background-size:cover;background-position:center;padding:64px 0 58px}
.page-hero .wrap{position:relative;z-index:1}
.page-hero .eyebrow{display:flex;align-items:center;gap:11px;min-height:26px;margin:0 0 12px;padding:0;border:0;background:transparent;color:#fff;font-size:14px;font-weight:800;letter-spacing:.35px;line-height:1.35;text-transform:none;text-shadow:0 1px 1px rgba(0,0,0,.24);box-shadow:none}
.page-hero .eyebrow::before{content:"";flex:0 0 42px;width:42px;height:3px;margin:0;background:var(--brand);opacity:1;vertical-align:middle}
.page-hero h1{max-width:880px;margin:12px 0;color:#fff;font-size:clamp(28px,3.6vw,42px);line-height:1.18;letter-spacing:-.02em;text-shadow:0 1px 2px rgba(0,0,0,.28)}
.page-hero .lead{max-width:800px;margin:0;font-size:17px;line-height:1.75;color:#c8d9df}

/* 按钮 */
.btn{display:inline-block;margin:15px 10px 0 0;padding:14px 23px;background:var(--brand);border:1px solid var(--brand);border-radius:0;color:#fff;font-weight:700;cursor:pointer;transition:transform .2s,background .2s,border-color .2s,filter .2s}
.btn:hover{transform:translateY(-2px);filter:brightness(.93)}
.btn.alt{background:transparent;border-color:#7e9aa7}
.btn.alt:hover{background:rgba(255,255,255,.12);border-color:#fff}

/* 首屏下方三项证明 */
.proof{position:relative;z-index:2;padding:0;background:#e8eff2;color:var(--ink)}
.proof .wrap{display:grid;grid-template-columns:repeat(3,1fr);gap:0;margin-top:0;background:#fff;border:1px solid #d5e0e4;box-shadow:0 14px 36px rgba(9,32,44,.09);transform:translateY(-28px)}
.proof .wrap>div{display:flex;flex-direction:column;justify-content:center;min-height:132px;padding:26px 28px;border-right:1px solid var(--line)}
.proof .wrap>div:last-child{border-right:0}
.proof b{display:block;margin-bottom:7px;font-size:24px;line-height:1.15;color:#102936}

/* ---------- 通用区块与排版 ---------- */
.section{padding:88px 0}
.section.alt:not(#capability){background:linear-gradient(135deg,#dbe6e9,#edf3f4)}
.section:not(.alt):not(.soft-bg):not(#solutions):not(.project-story):not(#about){background:linear-gradient(135deg,#edf3f5,#f7f9f9 60%,#e3edef)}
h2{margin:0 0 12px;font-size:34px;line-height:1.25}
h3{margin:8px 0;line-height:1.3}
.section .wrap>h2{max-width:920px;letter-spacing:-.025em}
.lead{max-width:800px;font-size:17px;line-height:1.75;color:var(--muted)}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:30px;align-items:stretch}
.card{padding:25px;background:#fff;border:1px solid var(--line);border-radius:7px;overflow:hidden;box-shadow:0 1px 0 rgba(11,29,39,.03);transition:transform .24s ease,box-shadow .24s ease,border-color .24s ease}
.card:hover{transform:translateY(-5px);border-color:#b9c9d0;box-shadow:var(--shadow)}
.card:hover .visual img{transform:scale(1.035)}
.card h3{font-size:22px;margin-top:9px}
.card p{color:var(--muted)}
.tag{font-size:12px;font-weight:800;color:var(--brand);text-transform:uppercase;letter-spacing:1px}
.visual{margin:-25px -25px 20px;background:#dce4e7;aspect-ratio:4/3;overflow:hidden}
.visual img{display:block;width:100%;height:100%;object-fit:cover;background:transparent;transition:transform .45s ease}
.wide-photo{display:block;width:100%;height:auto;margin:28px 0 0;aspect-ratio:16/9;object-fit:cover;background:transparent;border-radius:7px;box-shadow:var(--shadow)}
.table{width:100%;margin-top:22px;border-collapse:collapse}
.table td{padding:14px;border-bottom:1px solid var(--line);font-size:14px}
.table td:first-child{width:32%;font-weight:700}

/* 区块定位文字（eyebrow）：统一"橙色短条 + 粗体标题"系统 */
main .eyebrow,section#solutions .wrap>.eyebrow,section#capability .wrap>.eyebrow{display:flex;align-items:center;gap:15px;min-height:40px;margin:0 0 18px;padding:0;border:0;background:transparent;color:#9b421f;font-size:22px;font-weight:800;letter-spacing:.15px;line-height:1.3;text-transform:none;box-shadow:none}
main .eyebrow::before,section#solutions .wrap>.eyebrow::before,section#capability .wrap>.eyebrow::before{content:"";flex:0 0 62px;width:62px;height:5px;margin:0;background:var(--brand);opacity:1}
.hero .eyebrow,#solutions .eyebrow,.project-story .eyebrow,#about .eyebrow,#contact .eyebrow,.delivery-copy .eyebrow,section#solutions .wrap>.eyebrow{color:#fff;text-shadow:0 1px 1px rgba(0,0,0,.24)}
#about .eyebrow,#contact .eyebrow{display:flex;align-items:center;gap:15px;min-height:40px;margin:0 0 18px;padding:0;border:0;background:transparent;color:#fff;font-size:22px;font-weight:800;letter-spacing:.15px;line-height:1.3;box-shadow:none}
#about .eyebrow::before,#contact .eyebrow::before{content:"";flex:0 0 62px;width:62px;height:5px;margin:0;background:var(--brand);opacity:1}

/* ---------- 解决方案（深色工业风） ---------- */
#solutions{position:relative;overflow:hidden;color:#fff;background-color:#0b2531;background-image:linear-gradient(90deg,rgba(5,23,32,.97) 0%,rgba(5,23,32,.92) 47%,rgba(5,23,32,.77) 100%),url("images/showcase/08-shipping.webp");background-size:cover;background-position:center 54%}
#solutions::before{content:"";position:absolute;inset:0;z-index:0;pointer-events:none;background:linear-gradient(90deg,rgba(255,255,255,.045) 1px,transparent 1px),linear-gradient(0deg,rgba(255,255,255,.035) 1px,transparent 1px);background-size:78px 78px;mix-blend-mode:screen;opacity:.48}
#solutions .wrap{position:relative;z-index:1}
#solutions h2{color:#fff;max-width:790px}
#solutions .lead{color:#bdd0d7}
#solutions .grid{grid-template-columns:1.16fr 1fr 1fr;gap:16px}
#solutions .card{position:relative;isolation:isolate;display:flex;flex-direction:column;justify-content:flex-end;min-height:520px;padding:25px 24px 27px;overflow:hidden;background:#f8fafb;border:0;border-radius:2px;color:#fff;box-shadow:0 18px 38px rgba(0,0,0,.3);transition:transform .32s ease,box-shadow .32s ease}
#solutions .card::after{content:"";position:absolute;inset:0;z-index:-1;background:linear-gradient(180deg,rgba(5,18,25,.02) 30%,rgba(4,18,25,.32) 54%,rgba(4,18,25,.96) 100%)}
#solutions .card::before{content:"";position:absolute;left:0;bottom:0;z-index:2;width:5px;height:104px;background:var(--brand);transition:height .3s ease}
#solutions .card:hover{transform:translateY(-8px);box-shadow:0 25px 46px rgba(0,0,0,.4);border-color:transparent}
#solutions .card:hover::before{height:100%}
#solutions .card .visual{position:absolute;inset:0;z-index:-2;margin:0;aspect-ratio:auto;background:#102e3b}
#solutions .card .visual img{width:100%;height:100%;object-fit:cover;transform:scale(1.002);transition:transform .65s cubic-bezier(.2,.6,.2,1)}
#solutions .card:hover .visual img{transform:scale(1.07)}
#solutions .card .tag{position:relative;z-index:3;margin:0 0 7px;font-size:11px;color:#ffbd9b}
#solutions .card h3{position:relative;z-index:3;max-width:330px;margin:0 0 10px;color:#fff;font-size:clamp(21px,2vw,28px);line-height:1.14}
#solutions .card p{position:relative;z-index:3;max-width:360px;margin:0;font-size:14px;line-height:1.68;color:#d9e4e8}

/* ---------- 制造能力 ---------- */
#capability{position:relative;background-color:#d9e3e6;background-image:linear-gradient(rgba(255,255,255,.45) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.45) 1px,transparent 1px);background-size:38px 38px}
#capability h2{max-width:820px;color:#112e3a;font-size:clamp(29px,3.2vw,43px);line-height:1.28}
#capability .table{margin-top:26px;overflow:hidden;background:rgba(255,255,255,.88);border:0;border-left:4px solid var(--brand);border-radius:0;box-shadow:0 12px 26px rgba(46,78,90,.10)}
#capability .table tr{transition:background .22s ease}
#capability .table td{padding:15px 20px;font-size:14px;line-height:1.68;transition:background .22s ease,color .22s ease}
#capability .table td:first-child{background:#91aeb8;color:#102f3b;font-size:13px;font-weight:700;text-transform:uppercase;letter-spacing:.2px}
#capability .table td:nth-child(2){color:#42545e}
#capability .table tr:hover td{background:#fff6f1;color:#172f3a}
#capability .table tr:hover td:first-child{background:#7f9fa9;color:#082a36}
#capability .grid{margin-top:26px;padding:18px 16px 24px;gap:14px;grid-template-columns:repeat(5,minmax(0,1fr));background:rgba(255,255,255,.3);border:1px solid rgba(190,207,213,.56);border-radius:7px}
#capability .card{padding:11px;background:#fff;border-radius:0;box-shadow:none}
#capability .card .visual{margin:-11px -11px 12px;aspect-ratio:1.06/1}
#capability .card h3{margin:0;padding-left:5px;border-left:2px solid var(--brand);font-size:16px;line-height:1.35}

/* 工艺图焦点裁切（保留真实可用的 4 条） */
img[src$="laser-cutting.webp"]{object-position:center 58%}
img[src$="metal-bending.webp"]{object-position:center 48%}
img[src$="welding-frame.webp"],img[src$="sheet-metal-assembly.webp"]{object-position:center 56%}

/* ---------- 制造细节（深色） ---------- */
.project-story{position:relative;color:#fff;background-image:linear-gradient(104deg,rgba(7,29,39,.97) 0%,rgba(11,43,56,.93) 52%,rgba(7,29,39,.82) 100%),url("images/laser-cutting.webp");background-size:cover;background-position:center}
.project-story::before{content:"";position:absolute;left:0;right:0;top:0;height:1px;background:linear-gradient(90deg,transparent,rgba(185,220,230,.34),transparent)}
.project-story::after{content:"";position:absolute;inset:0;z-index:0;pointer-events:none;background:linear-gradient(90deg,rgba(255,255,255,.045) 1px,transparent 1px),linear-gradient(0deg,rgba(255,255,255,.035) 1px,transparent 1px);background-size:78px 78px;mix-blend-mode:screen;opacity:.48}
.project-story .wrap{position:relative;z-index:1}
.project-story h2{color:#fff;font-size:clamp(34px,3.2vw,44px);line-height:1.25}
.project-story .lead{color:#c8d9df}
.story-grid{display:grid;grid-template-columns:1.08fr .92fr;gap:34px;align-items:start;margin-top:30px}
.detail-pair{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.detail-card{margin:0;background:#f8fafb;border:1px solid rgba(255,255,255,.16);border-radius:7px;overflow:hidden;box-shadow:0 18px 32px rgba(0,0,0,.18)}
.detail-card img{display:block;width:100%;height:100%;object-fit:cover}
.detail-card:first-child img{object-position:center 38%}
.detail-card figcaption{padding:15px 16px 17px;font-size:15px;font-weight:700;color:#17313d}
.quality-card{margin:0;background:linear-gradient(145deg,#0b2531,#123c4d);border:1px solid rgba(202,229,237,.23);border-radius:7px;overflow:hidden;color:#fff;box-shadow:0 18px 32px rgba(0,0,0,.2)}
.quality-card img{display:block;width:100%;aspect-ratio:3/2;object-fit:cover}
.quality-card figcaption{padding:20px 22px 22px}
.quality-card strong{display:block;margin-bottom:7px;font-size:20px}
.quality-card p{margin:0;color:#cddbe0}

/* ---------- 案例展示区 ---------- */
.case-section{position:relative;background-color:#e4ecef;background-image:linear-gradient(135deg,rgba(255,255,255,.55),rgba(219,231,235,.72)),repeating-linear-gradient(90deg,rgba(22,56,70,.04) 0 1px,transparent 1px 64px)}
.case-section .wrap>h2{max-width:780px}
.case-row{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px;margin-top:28px}
.case-row-square figure{aspect-ratio:1/1}
.case-card{background:#fff;border:0;border-radius:2px;overflow:hidden;box-shadow:0 11px 24px rgba(12,39,50,.12);transition:transform .24s ease,box-shadow .24s ease}
.case-card:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
.case-card figure{margin:0;overflow:hidden;background:#d7e0e4;border-bottom:3px solid var(--brand)}
.case-card img{display:block;width:100%;height:100%;object-fit:cover;transition:transform .35s ease}
.case-card:hover img{transform:scale(1.025)}
.case-caption{padding:21px 22px 23px}
.case-caption h3{margin:7px 0;font-size:22px}
.case-caption p{margin:0;font-size:14px;line-height:1.65;color:var(--muted)}

/* 卡片内轮播 */
.case-carousel{position:relative;margin:0;overflow:hidden;background:#e2eaed}
.carousel-viewport{position:relative;width:100%;height:100%}
.carousel-viewport img{position:absolute;inset:0;display:block;width:100%;height:100%;object-fit:cover;object-position:center center;opacity:0;transition:opacity .35s ease}
.carousel-viewport img:first-child,.carousel-viewport img.is-active{opacity:1}
/* 个别产品图保留完整比例展示，不做裁切 */
.carousel-viewport img[src$="enclosure-3.webp"]{object-fit:contain}
.carousel-viewport img[src$="medical-2.webp"]{object-position:center top}
.carousel-arrow{position:absolute;top:50%;transform:translateY(-50%);z-index:2;display:grid;place-items:center;width:34px;height:34px;border:0;border-radius:50%;background:rgba(13,31,42,.55);color:#fff;font-size:20px;line-height:1;cursor:pointer;opacity:1;transition:background .25s ease,transform .25s ease,opacity .25s ease}
.carousel-arrow:hover{background:rgba(230,93,39,.92);transform:translateY(-50%) scale(1.12)}
.carousel-arrow.prev{left:10px}
.carousel-arrow.next{right:10px}
.carousel-dots{position:absolute;bottom:10px;left:0;right:0;z-index:2;display:flex;justify-content:center;gap:7px}
.carousel-dots .dot{width:10px;height:10px;padding:0;border:1.5px solid rgba(255,255,255,.7);border-radius:50%;background:rgba(20,40,55,.55);cursor:pointer;transition:background .2s ease,transform .2s ease,border-color .2s ease}
.carousel-dots .dot:hover{transform:scale(1.5);background:#e65d27;border-color:#e65d27}
.carousel-dots .dot.active{background:#e65d27;border-color:#e65d27;transform:scale(1.25)}

/* ---------- 关于业成 ---------- */
#about{position:relative;overflow:hidden;color:#fff;background-color:#0a2633;background-image:linear-gradient(105deg,rgba(5,24,32,.95) 0%,rgba(7,31,41,.89) 55%,rgba(5,24,32,.77) 100%),url("images/showcase/02-project-frame.webp");background-size:cover;background-position:center 56%}
#about .wrap{position:relative;z-index:1}
#about h2{color:#fff}
#about>.wrap>p{color:#d0e0e5}
#about>.wrap>.lead{color:#d0e0e5}
#about .wide-photo{border:0;border-radius:0;box-shadow:0 20px 38px rgba(0,0,0,.26)}
.delivery-band{display:grid;grid-template-columns:1fr 1.15fr;margin-top:34px;overflow:hidden;background:#0c2732;color:#fff}
.delivery-band>img{display:block;width:100%;height:100%;min-height:270px;object-fit:cover;object-position:center 54%}
.delivery-copy{align-self:center;padding:38px 42px;background:#0c2732;color:#fff}
.delivery-copy .eyebrow{display:flex;align-items:center;gap:11px;min-height:26px;margin:0 0 12px;padding:0;border:0;background:transparent;color:#fff;font-size:14px;font-weight:800;letter-spacing:.35px;line-height:1.35;text-transform:none;text-shadow:0 1px 1px rgba(0,0,0,.24)}
.delivery-copy .eyebrow::before{content:"";flex:0 0 42px;width:42px;height:3px;margin:0;background:var(--brand);opacity:1;vertical-align:middle}
.delivery-copy h3{margin:5px 0 13px;color:#fff;font-size:30px;line-height:1.14;text-shadow:none}
.delivery-copy p{margin:0;max-width:460px;color:#d2dde1;font-size:16px;line-height:1.65;text-shadow:none}
#about .delivery-copy{transition:background-color .28s ease,transform .28s ease,box-shadow .28s ease}
#about .delivery-copy:hover{background-color:#e65d27;transform:translateX(5px);box-shadow:0 12px 24px rgba(0,0,0,.2)}
#about .delivery-copy .eyebrow{color:#ff7a45}
#about .delivery-copy h3{color:#fff}
#about .delivery-copy p{color:#d7e3e7}
#about .delivery-copy:hover .eyebrow{color:#fff0e9}
#about .delivery-copy:hover p{color:#fff6f1}
.company-facts{margin-top:26px;padding:24px 26px;background:rgba(255,255,255,.06);border:1px solid rgba(202,229,237,.23);border-radius:7px}
.company-facts h3{margin:0 0 10px;color:#fff;font-size:22px}
.company-facts p{margin:0;color:#d0e0e5;font-size:15px;line-height:1.75}

/* ---------- 合作客户 ---------- */
.partners{display:flex;gap:14px;margin-top:30px;padding:18px 16px 24px;overflow:hidden;background:rgba(255,255,255,.3);border:1px solid rgba(190,207,213,.56);border-radius:7px;scrollbar-width:none}
.partners::-webkit-scrollbar{display:none}
.partner{display:flex;flex:0 0 184px;height:112px;min-height:112px;flex-direction:column;align-items:center;justify-content:center;gap:8px;padding:14px;background:rgba(255,255,255,.82);border:1px solid var(--line);border-radius:5px;color:#4a5b64;font-size:14px;font-weight:700;text-align:center;will-change:transform;transition:transform .22s ease,box-shadow .22s ease,border-color .22s ease,background .22s ease}
.partner:hover{transform:translateY(-4px);border-color:var(--brand);background:#fff;box-shadow:0 10px 20px rgba(10,27,37,.13)}
.partner img{display:block;width:auto;height:auto;max-width:156px;max-height:68px;object-fit:contain}

/* ---------- 常见问题 ---------- */
#faq{background:#fff}
.faq-item{margin:0 0 12px;border:1px solid var(--line);border-radius:8px;overflow:hidden}
.faq-item summary{position:relative;padding:14px 18px;padding-right:38px;color:var(--ink);font-weight:700;cursor:pointer;list-style:none}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";position:absolute;right:16px;top:50%;transform:translateY(-50%);font-size:20px;color:var(--brand)}
.faq-item[open] summary::after{content:"−"}
.faq-item p{margin:0;padding:0 18px 15px;color:#4a5a60;max-width:none}
.faq-more{margin:6px 0 0}
.faq-more a{color:var(--brand);font-weight:700}
.faq-more a:hover{text-decoration:underline}
.section-more{margin:6px 0 0}
.section-more a{color:var(--brand);font-weight:700}
.section-more a:hover{text-decoration:underline}
.solutions-extra{margin-top:28px;padding:22px 24px;background:#fff;border:1px solid var(--line);border-radius:7px}
.solutions-extra h3{margin:0 0 8px;font-size:18px}
.solutions-extra p{margin:0;color:var(--muted);font-size:15px;line-height:1.75}
.solutions-extra a{color:var(--brand);font-weight:700}

/* ---------- 联系业成 ---------- */
.cta{position:relative;padding:64px 0;overflow:hidden;background:linear-gradient(120deg,#071b25,#0d3343);color:#fff}
.cta::before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 92% 20%,rgba(64,130,151,.22),transparent 28%)}
.cta .wrap{position:relative}
.contact-grid{display:grid;grid-template-columns:1fr 1.1fr;gap:48px;align-items:start}
.contact-grid h2{margin-top:0}
.contact-points{padding:0;list-style:none;color:#d5e0e5}
.contact-points li{padding:7px 0;border-bottom:1px solid rgba(255,255,255,.14)}
.contact-panel{display:grid;gap:12px;padding:18px;background:#fff;border-radius:7px;color:var(--ink);box-shadow:0 12px 28px rgba(0,0,0,.16)}
.contact-card{display:flex;align-items:center;gap:14px;min-height:92px;padding:15px 16px;background:#fff;border:1px solid var(--line);border-radius:5px;color:var(--ink);transition:transform .28s ease,box-shadow .28s ease,border-color .28s ease}
.contact-card:hover{transform:translateY(-4px);border-color:var(--brand);box-shadow:0 14px 28px rgba(11,29,39,.16)}
.contact-card.phone-card{background:#fff;border:1px solid var(--brand);color:var(--ink)}
.contact-icon{display:grid;place-items:center;flex:0 0 42px;width:42px;height:42px;border-radius:50%;background:#edf3f5;color:#0e4059;font-size:23px;font-weight:700}
.contact-card span:last-child{display:grid;gap:2px;min-width:0}
.contact-card small{font-size:12px;font-weight:700;letter-spacing:.4px;text-transform:uppercase;color:var(--muted)}
.contact-card strong{font-size:20px;line-height:1.25;overflow-wrap:anywhere}
.contact-card em{font-size:13px;font-style:normal;color:var(--muted)}
.contact-card strong a{color:inherit;text-decoration:none;border-bottom:1px dashed rgba(230,93,39,.55)}
.contact-card strong a:hover{color:var(--brand);border-bottom-style:solid}
.contact-social{margin:4px 0 0;padding:0;list-style:none}
.contact-social a{display:inline-flex;align-items:center;gap:8px;color:#fff;font-weight:700;text-decoration:none;padding:4px 0}
.contact-social a:hover{color:#ffad87}
.contact-social svg{flex:0 0 auto}

/* ---------- 页脚 ---------- */
.footer{padding:34px 0;background:linear-gradient(90deg,#06131a,#0b2632);color:#aab9c0;font-size:14px;text-align:center}
.footer .wrap{display:flex;gap:30px;justify-content:center}
.footer strong{color:#fff}
.footer a{color:#fff}

/* 返回顶部 */
.back-to-top{position:fixed;right:20px;bottom:20px;z-index:8;width:42px;height:42px;border:0;border-radius:50%;background:var(--brand);color:#fff;font-size:20px;cursor:pointer;opacity:0;visibility:hidden;transform:translateY(8px);transition:.2s}
.back-to-top.visible{opacity:1;visibility:visible;transform:none}

/* ---------- 响应式 ---------- */
@media(max-width:1180px){
  .nav-promo{display:none}
}
@media(max-width:960px){
  .hero{min-height:540px}
  .proof .wrap>div{padding:22px 20px}
  #solutions .grid{grid-template-columns:repeat(3,1fr);gap:12px}
  #solutions .card{min-height:450px;padding:20px}
  #solutions .card h3{font-size:20px}
  #capability .grid{grid-template-columns:repeat(3,1fr)}
}
@media(max-width:760px){
  .nav{backdrop-filter:none}
  .nav .wrap{min-height:72px;gap:10px}
  .brand{font-size:18px}
  .brand small{font-size:8px;letter-spacing:.7px}
  .brand img{max-width:82px;max-height:58px}
  .menu-toggle{display:block}
  .links{position:absolute;top:72px;left:0;right:0;display:none;margin:0;padding:6px 20px 14px;background:#fff;border-bottom:1px solid var(--line);box-shadow:0 10px 18px rgba(10,27,37,.08)}
  .links.open{display:flex;flex-direction:column;gap:0}
  .links a{padding:10px 0}
  .links a:after{bottom:6px}
  .language{order:3}
  .hero{min-height:0;padding:65px 0;background-position:62% center}
  .hero::before{background:linear-gradient(90deg,rgba(6,24,34,.95),rgba(6,24,34,.67))}
  .hero .wrap{padding:36px 0}
  .hero p{font-size:16px}
  .hero .eyebrow{font-size:12px;letter-spacing:.15px}
  .hero .eyebrow::before{flex-basis:30px;width:30px}
  .page-hero{padding:44px 0 40px}
  .page-hero h1{font-size:30px}
  .page-hero .lead{font-size:16px}
  .proof{padding:0 0 8px}
  .proof .wrap{grid-template-columns:1fr;transform:none;border:1px solid var(--line);box-shadow:none}
  .proof .wrap>div{min-height:0;padding:19px 20px;border-right:0;border-bottom:1px solid var(--line)}
  .proof .wrap>div:last-child{border-bottom:0}
  .proof b{font-size:21px}
  .section{padding:62px 0}
  h2{font-size:30px}
  .grid{grid-template-columns:1fr}
  .table td:first-child{width:42%}
  main .eyebrow,section#solutions .wrap>.eyebrow,section#capability .wrap>.eyebrow{gap:10px;min-height:32px;margin-bottom:14px;font-size:17px}
  main .eyebrow::before,section#solutions .wrap>.eyebrow::before,section#capability .wrap>.eyebrow::before{flex-basis:42px;width:42px;height:4px}
  #about .eyebrow,#contact .eyebrow{gap:10px;min-height:32px;margin-bottom:14px;font-size:17px}
  #about .eyebrow::before,#contact .eyebrow::before{flex-basis:42px;width:42px;height:4px}
  .project-story{background:linear-gradient(145deg,#0b2936,#123d4e)}
  .project-story::after{opacity:.27}
  .project-story h2{font-size:32px}
  .story-grid{grid-template-columns:1fr;gap:20px}
  .case-row{grid-template-columns:1fr;gap:16px;margin-top:16px}
  .carousel-arrow{width:30px;height:30px;font-size:16px}
  #solutions{background-position:63% center}
  #solutions .grid{grid-template-columns:1fr;gap:14px}
  #solutions .card{min-height:440px;padding:23px 22px 25px}
  #solutions .card:hover{transform:none}
  #solutions .card:hover .visual img{transform:scale(1.002)}
  #solutions .card::before{height:82px}
  #capability .grid{grid-template-columns:repeat(2,1fr);gap:12px;padding:14px 12px 18px}
  #capability .table td:first-child{font-size:12px}
  #capability .card h3{font-size:15px}
  .card:hover,.case-card:hover,.contact-card:hover{transform:none}
  #about{background-color:#0a2633;background-image:linear-gradient(105deg,rgba(5,24,32,.95),rgba(7,31,41,.84)),url("images/showcase/02-project-frame.webp")}
  .delivery-band{grid-template-columns:1fr}
  .delivery-band>img{min-height:0;aspect-ratio:16/9;object-position:58% center}
  .delivery-copy{padding:28px 24px}
  .delivery-copy h3{font-size:27px}
  .delivery-copy .eyebrow{font-size:12px;letter-spacing:.15px}
  .delivery-copy .eyebrow::before{flex-basis:30px;width:30px}
  .partners{gap:12px;padding:14px 12px 18px}
  .partner{flex-basis:156px;height:102px;min-height:102px;padding:12px}
  .partner img{max-width:128px;max-height:60px}
  .cta{padding:54px 0}
  .contact-grid{grid-template-columns:1fr}
  .contact-panel{padding:14px}
  .contact-card{min-height:84px;padding:13px}
  .contact-card strong{font-size:17px}
  .contact-card em{font-size:12px}
  .footer .wrap{display:block}
  .footer .wrap>*+*{margin-top:12px}
}

/* ---------- 浅色内容区：制造能力总览同款（网格底 + 白卡 + 橙条 + 深蓝格栅） ---------- */
.soft-bg{background-color:#d9e3e6;background-image:linear-gradient(rgba(255,255,255,.45) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.45) 1px,transparent 1px);background-size:38px 38px}
#faq.soft-bg{background-color:#d9e3e6;background-image:linear-gradient(rgba(255,255,255,.45) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.45) 1px,transparent 1px);background-size:38px 38px}
.soft-bg .card{background:#fff;border:0;border-left:5px solid var(--brand);border-radius:0;box-shadow:0 12px 26px rgba(46,78,90,.12)}
.soft-bg .card .visual{background:#dce4e7}
.soft-bg .card h3{color:#14303c}
.soft-bg .card p{color:#566a74}
.soft-bg .case-card{background:#fff;border:0;border-radius:0;box-shadow:0 12px 26px rgba(46,78,90,.12)}
.soft-bg .case-row{background:rgba(255,255,255,.3);border:1px solid rgba(190,207,213,.56);border-radius:7px;padding:18px 16px 24px;gap:14px}
.soft-bg .solutions-extra{background:#fff;border:0;border-left:5px solid var(--brand);border-radius:0;box-shadow:0 12px 26px rgba(46,78,90,.12)}
.soft-bg .faq-item{background:#fff;border:0;border-left:5px solid var(--brand);border-radius:0;box-shadow:0 8px 20px rgba(46,78,90,.08)}

/* ---------- 404 页（原内联样式收编，视觉不变） ---------- */
.page-404 .wrap{max-width:640px;text-align:center}
.page-404 h1{font-size:clamp(28px,5vw,44px)}
.page-404 .lead{max-width:none}