@charset "utf-8";
/* ============================================================
   POLYCODE 多边形代码工作室 · 官网样式
   深空黑 + 赛车红 · 纯静态，无依赖
   ============================================================ */

:root {
  --red: #e01b2d;
  --red-hot: #ff3b2f;
  --amber: #ffb400;
  --bg: #08090c;
  --bg-1: #0d0f14;
  --bg-2: #12151d;
  --line: rgba(255, 255, 255, 0.08);
  --line-2: rgba(255, 255, 255, 0.14);
  --txt: #eceef2;
  --txt-2: #a8b0bb;
  --txt-3: #6d7681;
  --max: 1280px;
  --nav-h: 72px;
  --r: 14px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 12px);
  -webkit-text-size-adjust: 100%;
}

body {
  background: var(--bg);
  color: var(--txt);
  font-family: "HarmonyOS Sans SC", "PingFang SC", "Microsoft YaHei",
    "Hiragino Sans GB", "Source Han Sans SC", "Noto Sans CJK SC", system-ui,
    -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
::selection { background: var(--red); color: #fff; }

/* 滚动条 */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: #2a2f3a; border-radius: 6px; }
::-webkit-scrollbar-thumb:hover { background: var(--red); }

/* ---------- 通用容器 ---------- */
.wrap { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 24px; }
.sec { position: relative; padding: 110px 0; }
.sec--alt { background: var(--bg-1); }

/* ---------- 入场动画 ---------- */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
.reveal[data-d="1"] { transition-delay: .08s; }
.reveal[data-d="2"] { transition-delay: .16s; }
.reveal[data-d="3"] { transition-delay: .24s; }
.reveal[data-d="4"] { transition-delay: .32s; }
.reveal[data-d="5"] { transition-delay: .4s; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1 !important; transform: none !important; transition: none; }
  * { animation-duration: .001ms !important; animation-iteration-count: 1 !important; }
}

/* ============================================================
   顶部导航
   ============================================================ */
.progress { position: fixed; top: 0; left: 0; height: 2px; width: 0; z-index: 120;
  background: linear-gradient(90deg, var(--red), var(--amber)); }

.nav {
  position: fixed; top: 0; left: 0; right: 0; height: var(--nav-h); z-index: 110;
  display: flex; align-items: center;
  transition: background .35s var(--ease), box-shadow .35s var(--ease), backdrop-filter .35s;
}
.nav::after { content: ""; position: absolute; inset: 0; z-index: -1;
  background: rgba(8, 9, 12, .82); backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid transparent; transition: border-color .35s; }
.nav.stuck::after { border-bottom-color: var(--line); }
.nav__in { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; gap: 28px; }

.brand { display: flex; align-items: center; gap: 11px; flex-shrink: 0; }
.brand__logo { height: 34px; width: auto; }
.brand__txt { display: flex; flex-direction: column; line-height: 1.15; }
.brand__cn { font-size: 17px; font-weight: 800; letter-spacing: .06em; }
.brand__en { font-size: 10px; letter-spacing: .34em; color: var(--txt-3); font-weight: 600; }

.nav__menu { display: flex; gap: 4px; margin-left: auto; }
.nav__link { position: relative; padding: 8px 15px; font-size: 14.5px; font-weight: 500;
  color: var(--txt-2); border-radius: 8px; transition: color .25s, background .25s; }
.nav__link i { font-style: normal; font-size: 11px; font-weight: 800; color: var(--txt-3);
  margin-right: 7px; transition: color .25s; }
.nav__link::after { content: ""; position: absolute; left: 15px; right: 15px; bottom: 2px;
  height: 2px; background: var(--red); transform: scaleX(0); transform-origin: left;
  transition: transform .3s var(--ease); border-radius: 2px; }
.nav__link:hover { color: #fff; background: rgba(255, 255, 255, .05); }
.nav__link.active { color: #fff; }
.nav__link.active i { color: var(--red); }
.nav__link.active::after { transform: scaleX(1); }

.nav__cta { display: inline-flex; align-items: center; gap: 8px; padding: 9px 18px; font-size: 14px;
  font-weight: 700; border-radius: 999px; white-space: nowrap;
  background: linear-gradient(135deg, var(--red), #b3121f); color: #fff;
  box-shadow: 0 6px 20px -8px rgba(224, 27, 45, .9); transition: transform .25s var(--ease), box-shadow .25s; }
.nav__cta:hover { transform: translateY(-2px); box-shadow: 0 12px 26px -8px rgba(224, 27, 45, 1); }

.burger { display: none; margin-left: auto; width: 42px; height: 42px; border-radius: 10px;
  align-items: center; justify-content: center; flex-direction: column; gap: 5px;
  background: rgba(255, 255, 255, .06); }
.burger span { display: block; width: 18px; height: 2px; background: #fff; border-radius: 2px;
  transition: transform .3s var(--ease), opacity .2s; }
.burger.on span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.burger.on span:nth-child(2) { opacity: 0; }
.burger.on span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============================================================
   HERO
   ============================================================ */
.hero { position: relative; min-height: 100svh; display: flex; align-items: center;
  padding: calc(var(--nav-h) + 40px) 0 90px; overflow: hidden; }
.hero__bg { position: absolute; inset: 0; z-index: 0; }
.hero__slide { position: absolute; inset: 0; opacity: 0; transition: opacity 1.4s var(--ease);
  background-size: cover; background-position: center; transform: scale(1.06); }
.hero__slide.on { opacity: 1; transform: scale(1); transition: opacity 1.6s var(--ease), transform 9s linear; }
.hero__mask { position: absolute; inset: 0;
  background:
    linear-gradient(180deg, rgba(8,9,12,.86) 0%, rgba(8,9,12,.55) 34%, rgba(8,9,12,.72) 68%, var(--bg) 100%),
    radial-gradient(90% 70% at 15% 45%, rgba(8,9,12,.9), transparent 70%),
    linear-gradient(100deg, rgba(224,27,45,.16), transparent 42%); }
.hero__grid { position: absolute; inset: 0; z-index: 0; opacity: .32; pointer-events: none;
  background-image: linear-gradient(rgba(255,255,255,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.05) 1px, transparent 1px);
  background-size: 68px 68px;
  mask-image: radial-gradient(70% 60% at 50% 40%, #000, transparent 75%);
  -webkit-mask-image: radial-gradient(70% 60% at 50% 40%, #000, transparent 75%); }

.hero__in { position: relative; z-index: 2; }
.hero__eyebrow { display: inline-flex; align-items: center; gap: 10px; padding: 7px 16px 7px 8px;
  border: 1px solid var(--line-2); border-radius: 999px; background: rgba(255,255,255,.05);
  backdrop-filter: blur(8px); font-size: 13px; color: var(--txt-2); margin-bottom: 26px; }
.hero__eyebrow b { display: inline-grid; place-items: center; padding: 2px 9px; border-radius: 999px;
  background: var(--red); color: #fff; font-size: 11px; font-weight: 800; letter-spacing: .08em; }

.hero__title { font-size: clamp(40px, 7.4vw, 92px); line-height: 1.08; font-weight: 900;
  letter-spacing: .02em; margin-bottom: 8px; }
.hero__title span { display: block; background: linear-gradient(96deg, #fff 30%, var(--amber) 78%);
  -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero__en { font-size: clamp(11px, 1.3vw, 14px); font-weight: 700; letter-spacing: .5em;
  color: var(--red-hot); margin-bottom: 24px; }
.hero__desc { max-width: 620px; font-size: clamp(16px, 1.65vw, 19px); color: var(--txt-2); margin-bottom: 38px; }
.hero__desc b { color: #fff; font-weight: 600; }

.hero__btns { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 66px; }
.btn { display: inline-flex; align-items: center; gap: 9px; padding: 14px 30px; border-radius: 999px;
  font-size: 15px; font-weight: 700; letter-spacing: .02em; transition: transform .25s var(--ease), box-shadow .25s, background .25s, border-color .25s; }
.btn--pri { background: linear-gradient(135deg, var(--red), #ad1120); color: #fff;
  box-shadow: 0 14px 34px -14px rgba(224,27,45,1); }
.btn--pri:hover { transform: translateY(-3px); box-shadow: 0 20px 40px -14px rgba(224,27,45,1); }
.btn--ghost { border: 1px solid var(--line-2); color: var(--txt); background: rgba(255,255,255,.04); }
.btn--ghost:hover { transform: translateY(-3px); border-color: var(--red); background: rgba(224,27,45,.12); }
.btn svg { width: 16px; height: 16px; }

.hero__stats { display: flex; flex-wrap: wrap; gap: 12px; }
.stat { flex: 1 1 160px; min-width: 140px; padding: 20px 22px; border-radius: var(--r);
  border: 1px solid var(--line); background: linear-gradient(160deg, rgba(255,255,255,.07), rgba(255,255,255,.02));
  backdrop-filter: blur(10px); transition: transform .3s var(--ease), border-color .3s; }
.stat:hover { transform: translateY(-4px); border-color: rgba(224,27,45,.5); }
.stat__n { font-size: 34px; font-weight: 900; line-height: 1.1; letter-spacing: -.01em;
  background: linear-gradient(120deg, #fff, var(--amber)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat__n sup { font-size: 15px; margin-left: 3px; -webkit-text-fill-color: var(--red-hot); }
.stat__l { font-size: 13px; color: var(--txt-3); margin-top: 4px; letter-spacing: .04em; }

.hero__dots { position: absolute; z-index: 3; right: 30px; bottom: 40px; display: flex; gap: 8px; }
.hero__dots button { width: 26px; height: 3px; border-radius: 3px; background: rgba(255,255,255,.24);
  transition: background .3s, width .3s var(--ease); }
.hero__dots button.on { background: var(--red); width: 42px; }

.scroll-tip { position: absolute; z-index: 3; left: 50%; bottom: 34px; transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 8px; font-size: 11px;
  letter-spacing: .28em; color: var(--txt-3); }
.scroll-tip i { display: block; width: 1px; height: 40px; background: linear-gradient(var(--red), transparent);
  animation: tip 1.9s var(--ease) infinite; }
@keyframes tip { 0% { transform: scaleY(0); transform-origin: top; } 45% { transform: scaleY(1); transform-origin: top; } 55% { transform: scaleY(1); transform-origin: bottom; } 100% { transform: scaleY(0); transform-origin: bottom; } }

/* ============================================================
   区块标题
   ============================================================ */
.shead { margin-bottom: 62px; }
.shead__part { display: flex; align-items: center; gap: 16px; margin-bottom: 16px; }
.shead__num { font-size: clamp(44px, 5.6vw, 76px); font-weight: 900; line-height: .9; letter-spacing: -.03em;
  color: transparent; -webkit-text-stroke: 1.5px rgba(224,27,45,.55); }
.shead__bar { flex: 1; height: 1px; background: linear-gradient(90deg, var(--red), transparent); }
.shead__tag { font-size: 11px; font-weight: 800; letter-spacing: .3em; color: var(--red); }
.shead__title { font-size: clamp(28px, 3.6vw, 46px); font-weight: 900; letter-spacing: .01em; margin-bottom: 14px; }
.shead__sub { max-width: 720px; color: var(--txt-2); font-size: 16.5px; }

/* ============================================================
   01 工作室简介
   ============================================================ */
.about { display: grid; grid-template-columns: 1.15fr .85fr; gap: 56px; align-items: center; margin-bottom: 84px; }
.about__txt h3 { font-size: clamp(22px, 2.4vw, 30px); font-weight: 800; margin-bottom: 18px; }
.about__txt p { color: var(--txt-2); margin-bottom: 16px; }
.about__txt p b, .about__txt li b { color: #fff; font-weight: 600; }
.about__txt mark { background: linear-gradient(transparent 62%, rgba(224,27,45,.35) 0); color: #fff; font-weight: 600; padding: 0 2px; }
.about__fig { position: relative; border-radius: 20px; overflow: hidden; border: 1px solid var(--line);
  aspect-ratio: 4 / 3; }
.about__fig img { width: 100%; height: 100%; object-fit: cover; }
.about__fig::after { content: ""; position: absolute; inset: 0;
  background: linear-gradient(200deg, transparent 40%, rgba(8,9,12,.75)); }

.svc { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; margin-bottom: 84px; }
.svc__c { position: relative; padding: 38px 34px 34px; border-radius: 18px; border: 1px solid var(--line);
  background: linear-gradient(165deg, var(--bg-2), var(--bg-1)); overflow: hidden;
  transition: transform .35s var(--ease), border-color .35s, box-shadow .35s; }
.svc__c:hover { transform: translateY(-6px); border-color: rgba(224,27,45,.45);
  box-shadow: 0 26px 50px -30px rgba(224,27,45,.75); }
.svc__c::before { content: ""; position: absolute; inset: 0; opacity: 0; transition: opacity .4s;
  background: radial-gradient(420px 200px at 100% 0%, rgba(224,27,45,.16), transparent 70%); }
.svc__c:hover::before { opacity: 1; }
.svc__ico { position: relative; width: 54px; height: 54px; border-radius: 14px; display: grid; place-items: center;
  background: linear-gradient(140deg, rgba(224,27,45,.9), rgba(150,15,30,.9)); margin-bottom: 22px;
  box-shadow: 0 10px 26px -12px rgba(224,27,45,1); }
.svc__ico svg { width: 26px; height: 26px; fill: none; stroke: #fff; stroke-width: 1.9; stroke-linecap: round; stroke-linejoin: round; }
.svc__c h4 { position: relative; font-size: 21px; font-weight: 800; margin-bottom: 12px; }
.svc__c p { position: relative; color: var(--txt-2); font-size: 15px; }
.svc__list { position: relative; margin-top: 18px; display: flex; flex-wrap: wrap; gap: 8px; }
.svc__list span { font-size: 12.5px; padding: 4px 12px; border-radius: 999px;
  border: 1px solid var(--line-2); color: var(--txt-2); background: rgba(255,255,255,.04); }

/* 时间轴 */
.tl { position: relative; padding-left: 34px; }
.tl::before { content: ""; position: absolute; left: 7px; top: 8px; bottom: 8px; width: 2px;
  background: linear-gradient(180deg, var(--red), rgba(224,27,45,.12)); }
.tl__i { position: relative; padding-bottom: 46px; }
.tl__i:last-child { padding-bottom: 0; }
.tl__i::before { content: ""; position: absolute; left: -34px; top: 7px; width: 16px; height: 16px;
  border-radius: 50%; background: var(--bg); border: 3px solid var(--red);
  box-shadow: 0 0 0 5px rgba(224,27,45,.12); }
.tl__i::after { content: ""; position: absolute; left: -34px; top: 12px; width: 16px; height: 6px;
  border-radius: 4px; background: var(--red); transform: translateX(4px); }
.tl__y { display: inline-block; font-size: 13px; font-weight: 900; letter-spacing: .12em; color: var(--red-hot);
  margin-bottom: 8px; }
.tl__t { font-size: 19px; font-weight: 800; margin-bottom: 10px; }
.tl__d { color: var(--txt-2); font-size: 15px; }
.tl__tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.tl__tags span { font-size: 12.5px; padding: 4px 12px; border-radius: 999px; color: var(--txt-2);
  background: rgba(255,255,255,.05); border: 1px solid var(--line); }
.tl__tags span[data-k="off"] { color: var(--txt-3); border-style: dashed; }

/* ============================================================
   02 技术简介
   ============================================================ */
.techlead { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-bottom: 26px; }
.mcard { position: relative; padding: 32px 26px 28px; border-radius: 16px; border: 1px solid var(--line);
  background: linear-gradient(170deg, var(--bg-2), var(--bg-1)); text-align: center;
  transition: transform .35s var(--ease), border-color .35s, box-shadow .35s; }
.mcard:hover { transform: translateY(-6px); border-color: rgba(224,27,45,.45);
  box-shadow: 0 24px 44px -30px rgba(224,27,45,.8); }
.mcard img { width: 60px; height: 60px; margin: 0 auto 18px; object-fit: contain;
  filter: drop-shadow(0 6px 14px rgba(0,0,0,.5)); }
.mcard h4 { font-size: 18px; font-weight: 800; margin-bottom: 9px; }
.mcard p { font-size: 14px; color: var(--txt-2); line-height: 1.7; }

.techgrid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.tcell { display: flex; gap: 18px; padding: 26px 28px; border-radius: 16px; border: 1px solid var(--line);
  background: var(--bg-1); transition: transform .3s var(--ease), border-color .3s, background .3s; }
.tcell:hover { transform: translateX(5px); border-color: rgba(224,27,45,.4); background: var(--bg-2); }
.tcell__n { flex-shrink: 0; width: 40px; height: 40px; border-radius: 11px; display: grid; place-items: center;
  font-size: 14px; font-weight: 900; color: #fff; background: linear-gradient(140deg, var(--red), #a30f1e); }
.tcell h4 { font-size: 17.5px; font-weight: 800; margin-bottom: 7px; }
.tcell p { font-size: 14.5px; color: var(--txt-2); }

.figrow { display: grid; grid-template-columns: 1.5fr 1fr; gap: 20px; margin-top: 26px; }
.figure { border-radius: 18px; overflow: hidden; border: 1px solid var(--line); background: var(--bg-1); }
.figure img { width: 100%; }
.figure figcaption { padding: 14px 22px; font-size: 13.5px; color: var(--txt-3);
  background: var(--bg-1); border-top: 1px solid var(--line); }

.veh { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; margin-top: 26px; }
.veh__c { border-radius: 16px; overflow: hidden; border: 1px solid var(--line); background: var(--bg-1);
  transition: transform .35s var(--ease), border-color .35s; }
.veh__c:hover { transform: translateY(-5px); border-color: rgba(224,27,45,.42); }
.veh__c img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; }
.veh__b { padding: 20px 22px 22px; }
.veh__b h4 { font-size: 17.5px; font-weight: 800; margin-bottom: 7px; }
.veh__b p { font-size: 14.5px; color: var(--txt-2); }

/* ============================================================
   03 产品展示
   ============================================================ */
.tabs { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 34px; }
.tab { padding: 11px 24px; border-radius: 999px; font-size: 14.5px; font-weight: 700; color: var(--txt-2);
  border: 1px solid var(--line-2); background: rgba(255,255,255,.04);
  transition: color .25s, background .25s, border-color .25s, transform .25s var(--ease); }
.tab:hover { color: #fff; transform: translateY(-2px); }
.tab.on { color: #fff; border-color: transparent; background: linear-gradient(135deg, var(--red), #a30f1e);
  box-shadow: 0 10px 24px -12px rgba(224,27,45,1); }
.tab em { font-style: normal; font-size: 11.5px; opacity: .65; margin-left: 6px; }

.pane { display: none; }
.pane.on { display: block; animation: fade .5s var(--ease); }
@keyframes fade { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }

.cgrid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.ccard { position: relative; border-radius: 14px; overflow: hidden; border: 1px solid var(--line);
  background: #000; cursor: zoom-in; }
.ccard img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; transition: transform .6s var(--ease), filter .4s; }
.ccard:hover img { transform: scale(1.07); }
.ccard__b { position: absolute; inset: auto 0 0 0; padding: 30px 20px 16px;
  background: linear-gradient(transparent, rgba(8,9,12,.9) 62%);
  font-size: 15px; font-weight: 700; }
.ccard__b small { display: block; font-weight: 500; font-size: 12px; color: var(--txt-3); margin-top: 3px; }
.ccard::after { content: "＋"; position: absolute; top: 12px; right: 12px; width: 30px; height: 30px;
  display: grid; place-items: center; border-radius: 50%; font-size: 15px; color: #fff;
  background: rgba(8,9,12,.6); border: 1px solid var(--line-2); opacity: 0; transform: scale(.7);
  transition: opacity .3s, transform .3s var(--ease); }
.ccard:hover::after { opacity: 1; transform: none; }

.wgrid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.wcard { position: relative; border-radius: 13px; overflow: hidden; border: 1px solid var(--line);
  background: #05070a; cursor: zoom-in; }
.wcard img { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; transition: transform .6s var(--ease); }
.wcard:hover img { transform: scale(1.08); }
.wcard__b { padding: 14px 16px 15px; }
.wcard__b h4 { font-size: 14.5px; font-weight: 700; margin-bottom: 5px; }
.wcard__b p { font-size: 12px; color: var(--txt-3); line-height: 1.55; }
.wcard__tag { position: absolute; top: 10px; left: 10px; font-size: 11px; font-weight: 700; padding: 3px 10px;
  border-radius: 999px; color: #fff; background: rgba(224,27,45,.9); backdrop-filter: blur(4px); }
.wcard__tag[data-t="2"] { background: rgba(255,180,0,.92); color: #241a00; }
.wcard__tag[data-t="3"] { background: rgba(255,255,255,.82); color: #111; }

/* ============================================================
   04 商务合作
   ============================================================ */
.contact { display: grid; grid-template-columns: 1fr 340px; gap: 40px; align-items: start; }
.cgrid2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.cc { display: flex; align-items: center; gap: 18px; padding: 24px 26px; border-radius: 16px;
  border: 1px solid var(--line); background: linear-gradient(160deg, var(--bg-2), var(--bg-1));
  transition: transform .3s var(--ease), border-color .3s, box-shadow .3s; }
.cc:hover { transform: translateY(-5px); border-color: rgba(224,27,45,.45);
  box-shadow: 0 22px 40px -28px rgba(224,27,45,.9); }
.cc__ico { flex-shrink: 0; width: 52px; height: 52px; border-radius: 14px; display: grid; place-items: center;
  background: rgba(255,255,255,.06); border: 1px solid var(--line-2); }
.cc__ico img { width: 28px; height: 28px; object-fit: contain; }
.cc__ico svg { width: 24px; height: 24px; fill: none; stroke: var(--red-hot); stroke-width: 1.9; stroke-linecap: round; stroke-linejoin: round; }
.cc__k { font-size: 12px; letter-spacing: .16em; color: var(--txt-3); font-weight: 700; }
.cc__v { font-size: 18px; font-weight: 800; margin-top: 3px; word-break: break-all; }
.cc__v a:hover { color: var(--red-hot); }

.qr { padding: 26px; border-radius: 18px; border: 1px solid var(--line); text-align: center;
  background: linear-gradient(170deg, var(--bg-2), var(--bg-1)); }
.qr__img { width: 190px; margin: 0 auto 16px; padding: 12px; background: #fff; border-radius: 12px; }
.qr__img img { width: 100%; }
.qr b { display: block; font-size: 16px; margin-bottom: 6px; }
.qr p { font-size: 13.5px; color: var(--txt-3); line-height: 1.7; }

.notice { margin-top: 26px; padding: 18px 24px; border-radius: 14px; font-size: 14.5px; color: var(--txt-2);
  border: 1px solid rgba(255,180,0,.28); background: rgba(255,180,0,.07); }
.notice b { color: var(--amber); }

/* ============================================================
   页脚
   ============================================================ */
.foot { padding: 54px 0 30px; border-top: 1px solid var(--line); background: var(--bg-1); }
.foot__top { display: flex; flex-wrap: wrap; gap: 34px; align-items: flex-start;
  justify-content: space-between; padding-bottom: 30px; }
.foot__brand { display: flex; align-items: center; gap: 13px; }
.foot__brand img { height: 40px; }
.foot__brand div span { display: block; font-size: 18px; font-weight: 800; }
.foot__brand div small { font-size: 10px; letter-spacing: .3em; color: var(--txt-3); }
.foot__p { max-width: 340px; font-size: 13.5px; color: var(--txt-3); margin-top: 14px; }
.foot__links { display: flex; gap: 44px; flex-wrap: wrap; }
.foot__links div h5 { font-size: 12.5px; letter-spacing: .16em; color: var(--txt-3); margin-bottom: 13px; font-weight: 700; }
.foot__links a { display: block; font-size: 14px; color: var(--txt-2); padding: 4px 0; transition: color .25s; }
.foot__links a:hover { color: var(--red-hot); }
.foot__bot { display: flex; flex-wrap: wrap; gap: 12px; justify-content: space-between;
  padding-top: 22px; border-top: 1px solid var(--line); font-size: 12.5px; color: var(--txt-3); }

/* ============================================================
   灯箱
   ============================================================ */
.lb { position: fixed; inset: 0; z-index: 200; display: none; align-items: center; justify-content: center;
  padding: 40px 20px; background: rgba(4, 5, 7, .93); backdrop-filter: blur(8px); }
.lb.on { display: flex; animation: fade .3s var(--ease); }
.lb img { max-width: min(1280px, 94vw); max-height: 82vh; object-fit: contain; border-radius: 10px;
  box-shadow: 0 40px 90px -30px rgba(0,0,0,1); }
.lb__cap { margin-top: 16px; text-align: center; font-size: 15px; color: var(--txt-2); }
.lb__cap b { color: #fff; }
.lb__x, .lb__nav { position: absolute; display: grid; place-items: center; border-radius: 50%;
  background: rgba(255,255,255,.08); border: 1px solid var(--line-2); color: #fff;
  transition: background .25s, transform .25s; }
.lb__x:hover, .lb__nav:hover { background: var(--red); }
.lb__x { top: 24px; right: 24px; width: 44px; height: 44px; font-size: 22px; line-height: 1; }
.lb__nav { top: 50%; margin-top: -26px; width: 52px; height: 52px; font-size: 24px; }
.lb__nav--p { left: 24px; }
.lb__nav--n { right: 24px; }
.lb__inner { display: flex; flex-direction: column; align-items: center; max-width: 100%; }

/* 回到顶部 */
.totop { position: fixed; right: 26px; bottom: 26px; z-index: 100; width: 46px; height: 46px;
  display: grid; place-items: center; border-radius: 50%; color: #fff;
  background: rgba(18,21,29,.9); border: 1px solid var(--line-2); backdrop-filter: blur(8px);
  opacity: 0; visibility: hidden; transform: translateY(14px);
  transition: opacity .3s, visibility .3s, transform .3s var(--ease), background .25s; }
.totop.on { opacity: 1; visibility: visible; transform: none; }
.totop:hover { background: var(--red); }
.totop svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 2.2; stroke-linecap: round; stroke-linejoin: round; }

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1080px) {
  .about { grid-template-columns: 1fr; gap: 34px; }
  .techlead { grid-template-columns: repeat(2, 1fr); }
  .wgrid { grid-template-columns: repeat(3, 1fr); }
  .cgrid { grid-template-columns: repeat(2, 1fr); }
  .contact { grid-template-columns: 1fr; }
  .qr { max-width: 420px; }
}

@media (max-width: 860px) {
  .nav__menu, .nav__cta { display: none; }
  .burger { display: flex; }
  .nav.open { background: rgba(8,9,12,.96); }
  .nav.open::after { border-bottom-color: var(--line); }
  .nav__menu { position: fixed; top: var(--nav-h); left: 0; right: 0; flex-direction: column; gap: 2px;
    padding: 14px 24px 24px; background: rgba(8,9,12,.98); backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--line); display: none; }
  .nav.open .nav__menu { display: flex; animation: fade .3s var(--ease); }
  .nav__link { padding: 14px 12px; font-size: 16px; border-bottom: 1px solid var(--line); border-radius: 0; }
  .nav__link::after { display: none; }
  .nav.open .nav__cta { display: inline-flex; margin: 18px 0 0; justify-content: center; }

  .sec { padding: 76px 0; }
  .svc, .techgrid, .veh { grid-template-columns: 1fr; }
  .figrow { grid-template-columns: 1fr; }
  .hero__dots { display: none; }
  .scroll-tip { display: none; }
  .hero { min-height: auto; padding-bottom: 66px; }
  .hero__btns { margin-bottom: 46px; }
  .lb__nav { display: none; }
  .foot__links { gap: 28px; }
}

@media (max-width: 620px) {
  .wrap { padding: 0 18px; }
  .nav__in { padding: 0 18px; }
  .sec { padding: 62px 0; }
  .shead { margin-bottom: 42px; }
  .techlead, .cgrid, .wgrid, .cgrid2 { grid-template-columns: 1fr; }
  .wcard img { aspect-ratio: 16 / 9; }
  .hero__title { font-size: clamp(34px, 11vw, 52px); }
  .stat__n { font-size: 28px; }
  .tl { padding-left: 28px; }
  .tl__i::before, .tl__i::after { left: -28px; }
  .lb { padding: 20px 12px; }
  .lb__x { top: 12px; right: 12px; width: 38px; height: 38px; }
  .totop { right: 14px; bottom: 14px; width: 42px; height: 42px; }
  .foot__bot { flex-direction: column; }
}