/* ============================================================
   TechXJ 技术之疆 — 静态重写版样式
   视觉沿用原版：深色底 + 签名荧光绿 #b8ff3d + 玻璃拟态 + 网格
   零 JS 依赖：入场动画用 CSS，降级不影响内容
   ============================================================ */

:root{
  --ink:#070807;          /* 页面深底 */
  --obsidian:#101210;     /* 次级底 */
  --graphite:#1a1d1a;     /* 区块底 */
  --snow:#f4f7f2;         /* 主文字 */
  --signal:#b8ff3d;       /* 荧光绿/签名色 */
  --glacier:#7de7f2;      /* 冰蓝 */
  --gold:#d7b56d;         /* 金 */
  --white:#fff;
  --muted:rgba(244,247,242,.56);
  --muted2:rgba(244,247,242,.46);
  --font-sans:"PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:ui-monospace,"SF Mono",Menlo,Consolas,"Courier New",monospace;
  --ease:cubic-bezier(.4,0,.2,1);
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  background:var(--ink);
  color:var(--snow);
  font-family:var(--font-sans);
  line-height:1.6;
  overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}

/* ---------- 网格背景 ---------- */
.tech-grid{
  background-image:
    linear-gradient(rgba(244,247,242,.08) 1px,transparent 1px),
    linear-gradient(90deg,rgba(244,247,242,.08) 1px,transparent 1px);
  background-size:60px 60px;
}

/* ---------- 顶部导航 ---------- */
.site-header{
  position:fixed;inset:0 0 auto 0;z-index:50;
  border-bottom:1px solid rgba(244,247,242,.1);
  background:rgba(7,8,7,.66);
  backdrop-filter:blur(20px);
  -webkit-backdrop-filter:blur(20px);
}
.nav-inner{
  max-width:1280px;margin:0 auto;height:80px;
  padding:0 24px;
  display:flex;align-items:center;justify-content:space-between;
}
.logo{display:flex;align-items:center;gap:12px}
.logo img{width:44px;height:44px;border-radius:10px;border:1px solid rgba(244,247,242,.16);object-fit:cover}
.logo-name{line-height:1}
.logo-name b{display:block;font-size:14px;font-weight:600}
.logo-name span{display:block;margin-top:4px;font-family:var(--font-mono);font-size:10px;text-transform:uppercase;letter-spacing:.08em;color:rgba(244,247,242,.5)}
.site-nav{display:flex;align-items:center;gap:28px;font-size:14px;color:rgba(244,247,242,.68)}
.site-nav a{transition:color .18s}
.site-nav a:hover{color:var(--signal)}

/* ---------- 通用布局 ---------- */
.section{padding:108px 20px}
.container{max-width:1280px;margin:0 auto}
.section-heading{max-width:760px}
.eyebrow{
  font-family:var(--font-mono);
  font-size:.75rem;letter-spacing:.1em;text-transform:uppercase;
  color:var(--muted);
}
.sec-title{font-size:clamp(28px,4vw,40px);font-weight:600;margin-top:14px}

/* ---------- 玻璃卡片 ---------- */
.glass{
  background:rgba(255,255,255,.055);
  border:1px solid rgba(244,247,242,.12);
  border-radius:8px;
  backdrop-filter:blur(16px);
  -webkit-backdrop-filter:blur(16px);
  box-shadow:0 24px 90px rgba(0,0,0,.24);
}

/* ---------- 入场动画（CSS，无 JS） ---------- */
@keyframes revealUp{from{opacity:0;transform:translateY(24px)}to{opacity:1;transform:none}}
.reveal{opacity:0}
@supports (animation-timeline:view()){
  .reveal{animation:revealUp .8s var(--ease) both;animation-timeline:view();animation-range:entry 0% entry 40%}
}
@supports not (animation-timeline:view()){
  .reveal{opacity:1}
}
@media (prefers-reduced-motion:reduce){
  .reveal{animation:none;opacity:1}
}

/* ---------- 首页 Hero ---------- */
.hero{position:relative;min-height:94vh;display:flex;align-items:center;padding:120px 20px 80px}
.hero-bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.5}
.hero-mask{position:absolute;inset:0;background:
  linear-gradient(90deg,rgba(7,8,7,.96) 0%,rgba(7,8,7,.78) 45%,rgba(7,8,7,.16) 100%)}
.hero-grid{position:absolute;inset:0;opacity:.45}
.hero-inner{position:relative;z-index:2;max-width:1280px;margin:0 auto;display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
.badge{
  display:inline-flex;align-items:center;gap:10px;
  padding:8px 16px;border-radius:6px;border:1px solid rgba(244,247,242,.12);
  background:rgba(255,255,255,.055);font-family:var(--font-mono);font-size:12px;color:rgba(244,247,242,.64);
  backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);
}
.badge i{width:8px;height:8px;border-radius:50%;background:var(--signal);box-shadow:0 0 22px rgba(184,255,61,.75)}
.hero h1{font-size:clamp(44px,8vw,96px);font-weight:600;line-height:.98;margin-top:26px}
.hero h1 em{display:block;margin-top:14px;font-style:normal;font-size:clamp(28px,5vw,64px);color:var(--signal)}
.hero-sub{font-size:clamp(18px,2vw,24px);margin-top:30px;color:rgba(244,247,242,.78)}
.hero-desc{margin-top:22px;font-size:15px;line-height:1.8;color:rgba(244,247,242,.56);max-width:640px}

/* 首页实践图谱 */
.map-card{max-width:480px;margin-left:auto;padding:22px}
.map-head{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid rgba(244,247,242,.1);padding-bottom:16px}
.map-head .title{font-family:var(--font-mono);font-size:12px;color:rgba(244,247,242,.52)}
.map-head svg{color:var(--glacier)}
.map-list{display:grid;gap:12px;margin-top:22px}
.map-item{display:flex;justify-content:space-between;align-items:center;background:rgba(0,0,0,.2);border:1px solid rgba(244,247,242,.1);border-radius:6px;padding:12px 16px;font-size:14px;color:rgba(244,247,242,.78)}
.map-item b{font-family:var(--font-mono);font-size:12px;font-weight:400;color:var(--signal)}

/* ---------- 创新方向卡片 ---------- */
.cards-4{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:52px}
.direction-card{overflow:hidden;border-radius:10px;border:1px solid rgba(244,247,242,.1);background:rgba(255,255,255,.04)}
.direction-card .img{position:relative;aspect-ratio:4/3}
.direction-card .img img{width:100%;height:100%;object-fit:cover;opacity:.72;transition:transform .5s;filter:brightness(.8)}
.direction-card:hover .img img{transform:scale(1.05)}
.direction-card .grad{position:absolute;inset:0;background:linear-gradient(to top,rgba(0,0,0,.8),transparent)}
.direction-card .icon{position:absolute;bottom:16px;left:16px;color:var(--signal)}
.direction-card .body{padding:20px}
.direction-card .num{font-family:var(--font-mono);font-size:12px;color:rgba(244,247,242,.45)}
.direction-card h3{margin-top:8px;font-size:20px;font-weight:600}
.tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
.tags span{font-size:12px;color:rgba(244,247,242,.58);border:1px solid rgba(244,247,242,.1);border-radius:6px;padding:4px 10px}

/* ---------- 项目展示 ---------- */
.alt-section{background:var(--graphite)}
.project-list{display:grid;gap:12px;margin-top:52px}
.project-row{display:grid;grid-template-columns:minmax(180px,.45fr) minmax(0,1fr) auto;align-items:center;gap:24px;padding:24px;background:rgba(255,255,255,.035);border:1px solid rgba(244,247,242,.1);border-radius:8px;transition:border-color .18s,background .18s}
.project-row:hover{border-color:var(--signal);background:rgba(255,255,255,.06)}
.project-row .cat{font-family:var(--font-mono);font-size:12px;color:var(--glacier)}
.project-row h3{margin-top:8px;font-size:24px;font-weight:600}
.project-row p{font-size:14px;line-height:1.8;color:rgba(244,247,242,.58);max-width:640px}
.project-row .arr{color:rgba(244,247,242,.36)}

/* 技术路线 5 步 */
.route-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:16px;margin-top:40px;padding:22px;background:rgba(0,0,0,.2);border:1px solid rgba(244,247,242,.1);border-radius:10px}
.route-step{background:rgba(255,255,255,.035);border:1px solid rgba(244,247,242,.1);border-radius:6px;padding:16px}
.route-step .num{font-family:var(--font-mono);font-size:12px;color:rgba(244,247,242,.38)}
.route-step p{margin-top:24px;font-size:17px}

/* ---------- AI 实验室 ---------- */
.lab-card{position:relative;min-height:440px;overflow:hidden;border-radius:10px;border:1px solid rgba(244,247,242,.1)}
.lab-card img{width:100%;height:100%;position:absolute;object-fit:cover;opacity:.58}
.lab-card .veil{position:absolute;inset:0;background:rgba(0,0,0,.45)}
.lab-grid{position:absolute;inset:0;z-index:2;display:grid;grid-template-columns:repeat(3,1fr);gap:12px;padding:20px}
.lab-item{display:flex;align-items:flex-start;gap:12px;background:rgba(255,255,255,.055);border:1px solid rgba(244,247,242,.12);border-radius:8px;padding:14px;backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px)}
.lab-item svg{color:var(--signal);flex-shrink:0}
.lab-item .lbl{margin-top:6px;font-family:var(--font-mono);font-size:14px}
.split-2{display:grid;grid-template-columns:.88fr 1.12fr;gap:40px;align-items:center}

/* about 三段 */
.steps-3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.step-card{padding:24px}
.step-card .num{font-family:var(--font-mono);font-size:12px;color:var(--glacier)}
.step-card h3{margin-top:32px;font-size:24px;font-weight:600}
.step-card p{margin-top:20px;line-height:1.8;color:rgba(244,247,242,.62)}
.about-intro{font-size:15px;line-height:1.9;color:rgba(244,247,242,.56);max-width:760px;margin-top:44px}

/* 子页面 hero */
.page-hero{padding:150px 20px 70px}
.page-hero h1{font-size:clamp(30px,5vw,54px);font-weight:600}
.page-hero p{margin-top:24px;font-size:16px;line-height:1.9;color:rgba(244,247,242,.58);max-width:760px}
.breadcrumb{font-family:var(--font-mono);font-size:12px;color:var(--muted);margin-bottom:22px}

/* capability map */
.cap-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin-top:44px}
.cap-item{padding:20px}
.cap-item h3{font-size:17px;font-weight:600}
.cap-item p{margin-top:10px;font-size:13px;color:rgba(244,247,242,.52)}

/* ---------- 页脚 ---------- */
.site-footer{border-top:1px solid rgba(244,247,242,.1);padding:48px 20px}
.footer-inner{max-width:1280px;margin:0 auto;display:flex;justify-content:space-between;align-items:center;gap:32px;flex-wrap:wrap}
.footer-inner h4{font-size:22px;font-weight:600}
.footer-inner .sub{margin-top:8px;font-size:13px;color:rgba(244,247,242,.48)}
.footer-meta{display:flex;align-items:center;gap:12px;font-family:var(--font-mono);font-size:12px;color:rgba(244,247,242,.48);flex-wrap:wrap}
.footer-meta span{display:inline-flex;align-items:center;gap:6px}

/* 联系我：悬停显示二维码（纯CSS） */
.contact{position:relative;cursor:pointer}
.contact-qr{
  position:absolute;bottom:150%;left:50%;transform:translateX(-50%) scale(.95);
  width:140px;max-width:140px;height:140px;object-fit:contain;
  background:#fff;padding:8px;border-radius:8px;
  box-shadow:0 12px 40px rgba(0,0,0,.5);
  border:1px solid rgba(244,247,242,.15);
  opacity:0;visibility:hidden;pointer-events:none;
  transition:opacity .18s,transform .18s,visibility .18s;
  z-index:60;
}
.contact:hover .contact-qr,
.contact:focus-within .contact-qr{opacity:1;visibility:visible;transform:translateX(-50%) scale(1)}
.contact-qr:hover{visibility:visible;opacity:1}

/* ---------- 404 ---------- */
.notfound{min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:40px 20px}
.notfound .code{font-family:var(--font-mono);font-size:clamp(60px,14vw,140px);color:var(--signal);line-height:1}
.notfound p{margin-top:18px;color:var(--muted);font-size:16px}
.notfound a{margin-top:34px;display:inline-block;padding:12px 26px;border:1px solid var(--signal);color:var(--signal);border-radius:6px;transition:.18s}
.notfound a:hover{background:var(--signal);color:var(--ink)}

/* ---------- 响应式 ---------- */
@media(max-width:1024px){
  .hero-inner{grid-template-columns:1fr}
  .map-card{margin:0 auto}
  .cards-4{grid-template-columns:1fr 1fr}
  .split-2{grid-template-columns:1fr}
  .project-row{grid-template-columns:1fr;gap:14px}
  .route-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:768px){
  .site-nav{display:none}
  .section{padding:72px 18px}
  .cards-4{grid-template-columns:1fr}
  .steps-3{grid-template-columns:1fr}
  .route-grid{grid-template-columns:1fr}
  .cap-grid{grid-template-columns:1fr}
  .lab-grid{grid-template-columns:repeat(2,1fr)}
  .footer-inner{flex-direction:column;align-items:flex-start}
}