/* ===== 瑀砼科技 · 项目导向重构版 ===== */
:root {
  --ink: #191B1E;
  --ink-2: #212429;
  --paper: #F6F5F1;
  --paper-2: #FFFFFF;
  --line: #E4E1D8;
  --txt: #24262B;
  --mut: #71747C;
  --acc: #E8651C;
  --acc-2: #F39C42;
  --banner: #E8651C;
  --banner-deep: #8A3B14;
  --r: 14px;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
  color: var(--txt);
  background: var(--paper);
  line-height: 1.9;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
.wrap { max-width: 1200px; margin: 0 auto; padding: 0 28px; }

/* ---------- 导航 ---------- */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 20px 40px;
  background: var(--banner);
  transition: background .35s, padding .35s, box-shadow .35s;
}
.nav.scrolled {
  background: rgba(232, 101, 28, .94);
  backdrop-filter: blur(14px);
  padding: 12px 40px;
  box-shadow: 0 1px 0 rgba(255, 255, 255, .06);
}
.nav-logo { display: flex; align-items: center; gap: 12px; }
.nav-logo .wordmark { color: #fff; font-size: 22px; font-weight: 700; letter-spacing: 4px; }
.nav-logo .wordmark::first-letter { color: #FFD9B0; }
.nav-logo .brand-mark {
  height: 18px; width: auto; display: block;
  border-left: 1px solid rgba(255,255,255,.25); padding-left: 12px; opacity: .95;
}
.wordmark { color: #fff; font-weight: 700; letter-spacing: 4px; }
.nav-links { display: flex; gap: 34px; align-items: center; }
.nav-links a { color: rgba(255,255,255,.82); font-size: 15px; letter-spacing: .5px; position: relative; transition: color .25s; }
.nav-links a::after {
  content: ""; position: absolute; left: 0; bottom: -6px; width: 0; height: 2px;
  background: var(--acc); transition: width .3s;
}
.nav-links a:hover, .nav-links a.on { color: #fff; }
.nav-links a:hover::after, .nav-links a.on::after { width: 100%; }
.nav-cta {
  background: #fff; color: #B8410A !important; padding: 9px 22px; border-radius: 999px;
  font-size: 14px !important; transition: background .25s, transform .25s !important;
}
.nav-cta:hover { background: #FFE9D8; transform: translateY(-1px); }
.nav-cta::after { display: none; }
.burger { display: none; }
.nav-mask { display: none; }

/* ---------- Hero ---------- */
.hero {
  position: relative; min-height: 100vh; display: flex; align-items: flex-end;
  background: var(--ink);
  overflow: hidden;
}
.hero-bg { position: absolute; inset: 0; }
.hero-bg img { width: 100%; height: 112%; object-fit: cover; opacity: .62; }
.hero-veil {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(25,27,30,.35) 0%, rgba(25,27,30,.15) 40%, rgba(25,27,30,.92) 100%);
}
.hero-inner { position: relative; width: 100%; padding: 0 0 96px; }
.hero-kicker {
  color: var(--acc-2); font-size: 14px; letter-spacing: 4px; margin-bottom: 22px;
  display: flex; align-items: center; gap: 14px;
}
.hero-kicker::before { content: ""; width: 44px; height: 1px; background: var(--acc-2); }
.hero h1 {
  color: #fff; font-size: clamp(38px, 5.6vw, 72px); line-height: 1.24; font-weight: 700;
  letter-spacing: 1px; margin-bottom: 26px;
}
.hero h1 .em { color: var(--acc-2); }
.hero-sub { color: rgba(255,255,255,.78); max-width: 640px; font-size: 18px; margin-bottom: 44px; }
.hero-actions { display: flex; gap: 18px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 14px 32px; border-radius: 999px; font-size: 15px; letter-spacing: 1px;
  transition: transform .25s, background .25s, border-color .25s;
}
.btn-acc { background: var(--acc); color: #fff; }
.btn-acc:hover { background: var(--acc-2); transform: translateY(-2px); }
.btn-ghost { border: 1px solid rgba(255,255,255,.45); color: #fff; }
.btn-ghost:hover { border-color: #fff; transform: translateY(-2px); }
.hero-scroll {
  position: absolute; right: 44px; bottom: 44px; color: rgba(255,255,255,.55);
  font-size: 12px; letter-spacing: 3px; writing-mode: vertical-rl;
  display: flex; align-items: center; gap: 12px;
}
.hero-scroll::after { content: ""; width: 1px; height: 56px; background: rgba(255,255,255,.4); }

/* 静态降级/截图模式 */
.static-mode .hero { min-height: 760px; }
.static-mode *, .static-mode *::before, .static-mode *::after {
  transition: none !important;
}

/* ---------- 数字带 ---------- */
.stats { background: var(--ink); padding: 44px 0 56px; border-top: 1px solid rgba(255,255,255,.07); }
.stats-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; max-width: 640px; margin: 0 auto; }
.stat { text-align: center; padding: 12px 8px; }
.stat b {
  display: block; color: var(--acc-2); font-size: clamp(34px, 3.6vw, 52px);
  font-weight: 700; line-height: 1.1; font-variant-numeric: tabular-nums;
}
.stat span { color: rgba(255,255,255,.6); font-size: 14px; letter-spacing: 1px; }

/* ---------- 通用区块 ---------- */
.sec { padding: 110px 0; }
.sec-dark { background: var(--ink-2); color: #fff; }
.sec-head { margin-bottom: 56px; }
.sec-kicker { color: var(--acc); font-size: 13px; letter-spacing: 4px; margin-bottom: 14px; display: flex; align-items: center; gap: 12px; }
.sec-kicker::before { content: ""; width: 34px; height: 1px; background: var(--acc); }
.sec-head h2 { font-size: clamp(28px, 3.4vw, 42px); line-height: 1.35; letter-spacing: 1px; }
.sec-head p { color: var(--mut); max-width: 620px; margin-top: 14px; }
.sec-dark .sec-head p { color: rgba(255,255,255,.6); }

/* ---------- 场景卡 ---------- */
.cat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.cat-card {
  position: relative; border-radius: var(--r); overflow: hidden; height: 340px;
  background: var(--ink); cursor: pointer;
}
.cat-card img { width: 100%; height: 100%; object-fit: cover; opacity: .78; transition: transform .6s cubic-bezier(.2,.6,.2,1), opacity .4s; }
.cat-card:hover img { transform: scale(1.05); opacity: .92; }
.cat-card .shade { position: absolute; inset: 0; background: linear-gradient(180deg, rgba(25,27,30,.05) 30%, rgba(25,27,30,.9) 100%); }
.cat-card .cap { position: absolute; left: 24px; right: 24px; bottom: 22px; color: #fff; }
.cat-card .cap .no { font-size: 12px; letter-spacing: 3px; color: var(--acc-2); margin-bottom: 6px; }
.cat-card .cap h3 { font-size: 21px; letter-spacing: 1px; }
.cat-card .cap p { font-size: 13.5px; color: rgba(255,255,255,.72); margin-top: 4px; }
.cat-card .go {
  position: absolute; top: 18px; right: 18px; width: 38px; height: 38px; border-radius: 50%;
  background: rgba(255,255,255,.14); backdrop-filter: blur(6px);
  display: flex; align-items: center; justify-content: center; color: #fff; font-size: 16px;
  transition: background .3s, transform .3s;
}
.cat-card:hover .go { background: var(--acc); transform: rotate(45deg); }

/* ---------- 精选故事 ---------- */
.story-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.story-card {
  background: var(--paper-2); border-radius: var(--r); overflow: hidden;
  border: 1px solid var(--line);
  transition: transform .35s, box-shadow .35s;
  display: flex; flex-direction: column;
}
.story-card:hover { transform: translateY(-6px); box-shadow: 0 24px 48px -18px rgba(25,27,30,.28); }
.story-card .pic { height: 230px; overflow: hidden; }
.story-card .pic img { width: 100%; height: 100%; object-fit: cover; transition: transform .6s; }
.story-card:hover .pic img { transform: scale(1.06); }
.story-card .bd { padding: 26px 26px 28px; flex: 1; display: flex; flex-direction: column; }
.chip {
  display: inline-block; align-self: flex-start; font-size: 12px; letter-spacing: 2px;
  color: var(--acc); border: 1px solid var(--acc); padding: 3px 12px; border-radius: 999px; margin-bottom: 14px;
}
.story-card h3 { font-size: 19px; line-height: 1.55; margin-bottom: 10px; }
.story-card .ex { color: var(--mut); font-size: 14.5px; flex: 1; }
.story-card .more { margin-top: 18px; color: var(--acc); font-size: 14px; letter-spacing: 1px; }
.story-card .more::after { content: " →"; }

/* ---------- 方法 ---------- */
.method-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.method-card { padding: 38px 30px; border: 1px solid rgba(255,255,255,.1); border-radius: var(--r); background: rgba(255,255,255,.03); }
.method-card .n { color: var(--acc-2); font-size: 14px; letter-spacing: 3px; margin-bottom: 16px; }
.method-card h3 { font-size: 21px; margin-bottom: 12px; letter-spacing: 1px; }
.method-card p { color: rgba(255,255,255,.68); font-size: 15px; }

/* ---------- 客户墙 ---------- */
.clients { background: var(--paper); }
.client-logos { display: flex; gap: 60px; align-items: center; justify-content: center; margin-bottom: 48px; flex-wrap: wrap; }
.client-logos img { height: 42px; width: auto; filter: grayscale(1) brightness(.35); opacity: .75; transition: filter .3s, opacity .3s; }
.client-logos img:hover { filter: none; opacity: 1; }
.marquee { overflow: hidden; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 22px 0; }
.marquee-track { display: flex; gap: 0; width: max-content; animation: mq 60s linear infinite; }
.marquee span { white-space: nowrap; color: var(--mut); font-size: 15px; padding: 0 22px; position: relative; }
.marquee span::after { content: "·"; position: absolute; right: -5px; color: var(--acc); }
@keyframes mq { to { transform: translateX(-50%); } }

/* ---------- CTA ---------- */
.cta { background: var(--ink); padding: 110px 0; text-align: center; }
.cta h2 { color: #fff; font-size: clamp(26px, 3.2vw, 40px); margin-bottom: 16px; }
.cta p { color: rgba(255,255,255,.65); margin-bottom: 38px; }

/* ---------- 页脚 ---------- */
.footer { background: #131518; color: rgba(255,255,255,.68); padding: 64px 0 34px; font-size: 14px; }
.foot-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 44px; margin-bottom: 44px; }
.foot-grid h4 { color: #fff; font-size: 15px; letter-spacing: 2px; margin-bottom: 16px; }
.foot-grid a { display: block; padding: 5px 0; transition: color .25s; }
.foot-grid a:hover { color: var(--acc-2); }
.foot-brand img { height: 32px; margin-bottom: 16px; }
.foot-brand p { line-height: 2; }
.foot-bar { border-top: 1px solid rgba(255,255,255,.08); padding-top: 26px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; font-size: 13px; color: rgba(255,255,255,.4); }
.foot-bar a { color: inherit; transition: color .25s; }
.foot-bar a:hover { color: var(--acc-2); }

/* ---------- 项目库 ---------- */
.page-hero { background: var(--ink); color: #fff; padding: 170px 0 70px; }
.page-hero h1 { font-size: clamp(32px, 4.2vw, 52px); letter-spacing: 1px; }
.page-hero p { color: rgba(255,255,255,.65); max-width: 640px; margin-top: 16px; }
.crumb { color: rgba(255,255,255,.45); font-size: 13px; letter-spacing: 2px; margin-bottom: 18px; }
.crumb b { color: var(--acc-2); font-weight: 400; }
.filter-bar { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 44px; position: sticky; top: 64px; z-index: 50; background: var(--paper); padding: 14px 0; }
.fbtn {
  border: 1px solid var(--line); background: var(--paper-2); border-radius: 999px;
  padding: 8px 20px; font-size: 14px; color: var(--mut); cursor: pointer;
  transition: all .25s; font-family: inherit;
}
.fbtn:hover { border-color: var(--acc); color: var(--acc); }
.fbtn.on { background: var(--ink); color: #fff; border-color: var(--ink); }
.proj-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.proj-card {
  background: var(--paper-2); border: 1px solid var(--line); border-radius: var(--r);
  overflow: hidden; transition: transform .3s, box-shadow .3s; display: flex; flex-direction: column;
}
.proj-card:hover { transform: translateY(-5px); box-shadow: 0 20px 40px -16px rgba(25,27,30,.22); }
.proj-card .pic { height: 200px; overflow: hidden; background: var(--ink); }
.proj-card .pic img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s; }
.proj-card:hover .pic img { transform: scale(1.05); }
.proj-card .bd { padding: 22px 22px 24px; flex: 1; display: flex; flex-direction: column; }
.proj-card h3 { font-size: 16.5px; line-height: 1.6; }
.proj-card .ex { color: var(--mut); font-size: 13.5px; margin-top: 8px; flex: 1; }
.roster-card { background: var(--paper-2); border: 1px dashed var(--line); border-radius: var(--r); padding: 24px; display: flex; flex-direction: column; justify-content: center; }
.roster-card h3 { font-size: 16px; line-height: 1.6; }
.roster-card p { color: var(--mut); font-size: 13.5px; margin-top: 8px; }
.hide { display: none !important; }

/* ---------- 详情页 ---------- */
.detail-hero { background: var(--ink); color: #fff; padding: 170px 0 0; }
.detail-hero h1 { font-size: clamp(26px, 3.4vw, 44px); line-height: 1.4; max-width: 900px; }
.detail-hero .meta { display: flex; gap: 14px; align-items: center; margin-bottom: 20px; flex-wrap: wrap; }
.detail-hero .chip { margin-bottom: 0; }
.detail-hero .src { color: rgba(255,255,255,.45); font-size: 13px; }
.detail-hero .pic { margin-top: 48px; border-radius: var(--r) var(--r) 0 0; overflow: hidden; }
.detail-hero .pic img { width: 100%; max-height: 560px; object-fit: cover; }
.prose { max-width: 860px; margin: 0 auto; padding: 70px 28px 90px; }
.prose p { margin: 20px 0; font-size: 17px; color: var(--txt); }
.prose p.lead { font-size: 20px; color: var(--ink); font-weight: 500; line-height: 2; }
.prose h3 {
  font-size: 24px; margin: 52px 0 8px; padding-left: 16px; border-left: 4px solid var(--acc);
  letter-spacing: .5px; line-height: 1.5;
}
.prose ul { margin: 18px 0 18px 4px; list-style: none; }
.prose li { padding: 7px 0 7px 26px; position: relative; color: var(--txt); }
.prose li::before { content: ""; position: absolute; left: 4px; top: 19px; width: 7px; height: 7px; border-radius: 50%; background: var(--acc); }
.gallery { max-width: 1000px; margin: 0 auto; padding: 0 28px 90px; display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.gallery img { border-radius: var(--r); width: 100%; height: 300px; object-fit: cover; }
.pn-nav { border-top: 1px solid var(--line); background: var(--paper-2); }
.pn-inner { display: grid; grid-template-columns: 1fr 1fr; max-width: 1000px; margin: 0 auto; }
.pn-nav a { padding: 34px 28px; display: block; transition: background .25s; }
.pn-nav a:hover { background: var(--paper); }
.pn-nav a.next { text-align: right; border-left: 1px solid var(--line); }
.pn-nav .lab { font-size: 12px; letter-spacing: 2px; color: var(--acc); margin-bottom: 8px; }
.pn-nav .t { font-size: 15px; color: var(--txt); }

/* ---------- 解决方案 ---------- */
.sol-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 26px; }
.sol-card {
  background: var(--paper-2); border: 1px solid var(--line); border-radius: var(--r);
  padding: 40px 36px; transition: transform .3s, box-shadow .3s; position: relative; overflow: hidden;
}
.sol-card::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 4px; background: var(--acc); }
.sol-card:hover { transform: translateY(-5px); box-shadow: 0 20px 40px -16px rgba(25,27,30,.22); }
.sol-card h3 { font-size: 21px; margin-bottom: 12px; }
.sol-card p { color: var(--mut); font-size: 15px; }
.sol-card .more { margin-top: 20px; color: var(--acc); font-size: 14px; display: inline-block; }
.sol-card .more::after { content: " →"; }

/* ---------- 关于/联系 ---------- */
.about-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 60px; align-items: start; }
.val-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; margin-top: 40px; }
.val-card { background: var(--paper-2); border: 1px solid var(--line); border-radius: var(--r); padding: 30px 26px; }
.val-card h3 { font-size: 18px; margin-bottom: 10px; color: var(--ink); }
.val-card p { font-size: 14.5px; color: var(--mut); }
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; }
.c-item { padding: 26px 0; border-bottom: 1px solid var(--line); }
.c-item h4 { color: var(--mut); font-size: 13px; letter-spacing: 2px; margin-bottom: 8px; font-weight: 400; }
.c-item p { font-size: 18px; color: var(--ink); }

/* ---------- 响应式 ---------- */
@media (max-width: 960px) {
  .burger {
    display: flex; flex-direction: column; justify-content: center; gap: 5px;
    width: 44px; height: 44px; border: none; background: rgba(255,255,255,.16);
    border-radius: 10px; cursor: pointer; padding: 11px; position: relative; z-index: 120;
    align-items: center;
  }
  .burger span { display: block; width: 22px; height: 2px; background: #fff; border-radius: 2px; transition: transform .3s, opacity .3s; }
  .burger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .burger.open span:nth-child(2) { opacity: 0; }
  .burger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
  .nav-mask {
    display: block; position: fixed; inset: 0; z-index: 104;
    background: rgba(0,0,0,.45); opacity: 0; pointer-events: none; transition: opacity .3s;
  }
  .nav-mask.open { opacity: 1; pointer-events: auto; }
  .nav-links {
    position: fixed; top: 0; right: 0; bottom: 0; z-index: 110;
    width: min(300px, 84vw); background: var(--ink);
    flex-direction: column; align-items: stretch; gap: 0;
    padding: 96px 0 40px;
    transform: translateX(100%); transition: transform .35s cubic-bezier(.2,.7,.2,1);
    box-shadow: -12px 0 40px rgba(0,0,0,.3);
    overflow-y: auto;
  }
  .nav-links.open { transform: translateX(0); }
  /* backdrop-filter 会把后代 fixed 元素的包含块改成 nav 自身，导致抽屉菜单错位，移动端必须禁用 */
  .nav.scrolled { backdrop-filter: none; -webkit-backdrop-filter: none; background: var(--banner); }
  .nav-links a { display: block; padding: 15px 30px; font-size: 17px; color: rgba(255,255,255,.9); }
  .nav-links a::after { display: none; }
  .nav-links a.on { color: var(--acc-2); }
  .nav-cta { display: block !important; margin: 22px 30px 0; text-align: center; padding: 13px 22px !important; }
  .stats-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .cat-grid, .story-grid, .method-grid { grid-template-columns: 1fr 1fr; }
  .proj-grid { grid-template-columns: 1fr 1fr; }
  .about-grid, .contact-grid { grid-template-columns: 1fr; }
  .gallery { grid-template-columns: 1fr; }
  .hero-scroll { display: none; }
}
@media (max-width: 640px) {
  body { font-size: 16px; }
  .wrap { padding: 0 20px; }
  .nav { padding: 14px 18px; }
  .nav.scrolled { padding: 10px 18px; }
  .nav-logo .wordmark { font-size: 19px; }
  .nav-logo .brand-mark { height: 15px; padding-left: 10px; }
  .hero-inner { padding-bottom: 72px; }
  .hero h1 { letter-spacing: .5px; }
  .hero-sub { font-size: 16px; }
  .cat-grid, .story-grid, .method-grid, .proj-grid, .sol-grid, .val-grid { grid-template-columns: 1fr; }
  .cat-card { height: 280px; }
  .sec { padding: 72px 0; }
  .page-hero { padding: 140px 0 56px; }
  .detail-hero { padding: 140px 0 0; }
  .detail-hero .pic { margin-top: 32px; }
  .prose { padding: 52px 20px 70px; font-size: 16px; }
  .prose h3 { font-size: 21px; margin-top: 44px; }
  .gallery { padding: 0 20px 70px; }
  .gallery img { height: 220px; }
  .pn-inner { grid-template-columns: 1fr; }
  .pn-nav a.next { border-left: none; border-top: 1px solid var(--line); }
  .foot-grid { grid-template-columns: 1fr; gap: 32px; }
  .filter-bar { position: static; }
  .sol-card { padding: 32px 26px; }
  .stats { padding: 36px 0 44px; }
  .cta { padding: 80px 0; }
  .marquee { padding: 16px 0; }
  .marquee span { font-size: 13.5px; padding: 0 16px; }
}

/* ---------- 关于页：加工实力 / 荣誉资质（融合自老站 www.xn--wgyy8f.com） ---------- */
.fact-intro { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; margin-bottom: 56px; }
.fact-intro .pic { border-radius: var(--r); overflow: hidden; border: 1px solid var(--line); }
.fact-intro .pic img { width: 100%; height: 100%; object-fit: cover; display: block; }
.fact-intro h3 { font-size: 24px; letter-spacing: 1px; margin-bottom: 16px; }
.fact-intro p { color: var(--mut); font-size: 15px; line-height: 1.9; }
.fact-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.fact-item { border-radius: var(--r); overflow: hidden; height: 240px; border: 1px solid var(--line); }
.fact-item img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform .6s cubic-bezier(.2,.6,.2,1); }
.fact-item:hover img { transform: scale(1.05); }
.cert-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.cert-card { border: 1px solid var(--line); border-radius: var(--r); overflow: hidden; background: #fff; color: var(--ink); transition: transform .3s, box-shadow .3s; }
.cert-card:hover { transform: translateY(-4px); box-shadow: 0 18px 36px -16px rgba(25,27,30,.22); }
.cert-card .pic { height: 320px; display: flex; align-items: center; justify-content: center; background: #F6F5F1; padding: 14px; }
.cert-card .pic img { max-width: 100%; max-height: 100%; object-fit: contain; display: block; }
@media (max-width: 960px) {
  .fact-intro { grid-template-columns: 1fr; }
  .fact-grid, .cert-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .fact-grid, .cert-grid { grid-template-columns: 1fr; }
  .fact-item { height: 220px; }
}