/* ===================================
   灵韧科技 — Stylesheet
   =================================== */

/* --- Reset --- */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased}
body{font-family:'Inter','Noto Sans SC',sans-serif;color:#1e293b;background:#fff;line-height:1.6;overflow-x:hidden}
::selection{background:#2563eb;color:#fff}
img{max-width:100%;display:block;user-select:none;-webkit-user-drag:none;pointer-events:auto}
canvas{-webkit-user-drag:none}
a{color:inherit;text-decoration:none}
.container{max-width:1200px;margin:0 auto;padding:0 40px}

/* --- Header --- */
.header{position:fixed;top:0;left:0;right:0;z-index:100;padding:18px 0;transition:all 0.3s}
.header.scroll{background:rgba(255,255,255,0.92);backdrop-filter:blur(16px);box-shadow:0 1px 0 rgba(0,0,0,0.06);padding:12px 0}
.header .container{display:flex;align-items:center;justify-content:space-between}
.logo{font-size:22px;font-weight:700;color:#0f172a;letter-spacing:-0.5px}
.logo span{color:#2563eb}
.nav{display:flex;gap:36px}
.nav a{font-size:14px;color:#64748b;font-weight:500;transition:color 0.2s}
.nav a:hover,.nav a.on{color:#0f172a}
.menu-btn{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:4px;z-index:101}
.menu-btn span{width:24px;height:2px;background:#0f172a;border-radius:2px;transition:0.3s}
.menu-btn.on span:nth-child(1){transform:rotate(45deg) translate(5px,5px)}
.menu-btn.on span:nth-child(2){transform:rotate(-45deg) translate(5px,-5px)}

/* --- Hero --- */
.hero{min-height:100vh;display:flex;align-items:center;position:relative;overflow:hidden}
.hero-bg{position:absolute;inset:0}
.hero-img{position:absolute;inset:0;background:#0f172a url('../img/bg-hero.avif') center/cover no-repeat}
.hero-gradient{position:absolute;inset:0;background:linear-gradient(160deg,rgba(15,23,42,0.88) 0%,rgba(15,23,42,0.55) 50%,rgba(15,23,42,0.78) 100%)}
.hero-content{position:relative;z-index:2;max-width:680px}
.hero-tag{font-size:12px;letter-spacing:4px;color:#60a5fa;font-weight:600;margin-bottom:20px}
.hero h1{font-size:clamp(40px,6vw,68px);font-weight:800;color:#fff;line-height:1.08;margin-bottom:24px;letter-spacing:-1.5px}
.hero h1 .hl{background:linear-gradient(135deg,#60a5fa,#a78bfa);-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.hero p{font-size:17px;color:rgba(255,255,255,0.55);line-height:1.8;margin-bottom:40px;font-weight:300}
.hero-btns{display:flex;gap:14px;flex-wrap:wrap}
.btn{display:inline-flex;padding:13px 30px;border-radius:8px;font-size:14px;font-weight:600;transition:all 0.3s;cursor:pointer;border:none;font-family:inherit}
.btn-fill{background:#2563eb;color:#fff}
.btn-fill:hover{background:#1d4ed8;transform:translateY(-1px);box-shadow:0 8px 24px rgba(37,99,235,0.35)}
.btn-line{border:1px solid rgba(255,255,255,0.35);color:#fff;background:transparent}
.btn-line:hover{border-color:#fff;background:rgba(255,255,255,0.08)}
.btn-block{width:100%;justify-content:center}

.hero-scroll{position:absolute;bottom:40px;left:50%;transform:translateX(-50%);z-index:2;width:1px;height:44px;background:rgba(255,255,255,0.25);overflow:hidden}
.hero-scroll::after{content:'';position:absolute;top:0;left:0;width:100%;height:22px;background:#fff;animation:scroll 2s ease infinite}
@keyframes scroll{0%{transform:translateY(-100%);opacity:0}40%{opacity:1}100%{transform:translateY(100%);opacity:0}}

/* --- Sections --- */
.section{padding:110px 0}
.section-label{font-size:11px;letter-spacing:4px;color:#2563eb;font-weight:700;margin-bottom:14px}
.section-heading{font-size:clamp(28px,4vw,44px);font-weight:700;color:#0f172a;margin-bottom:14px;letter-spacing:-0.8px}
.section-lead{font-size:16px;color:#64748b;max-width:520px;margin:0 auto 64px;text-align:center;line-height:1.7}

/* --- About --- */
.about{text-align:center;background:#f8fafc}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:32px;max-width:800px;margin:0 auto}
.stat{padding:32px 16px}
.stat-num{font-size:52px;font-weight:800;color:#0f172a;line-height:1;display:inline;letter-spacing:-2px}
.stat-unit{font-size:22px;font-weight:700;color:#2563eb;margin-left:2px}
.stat-text{font-size:14px;color:#94a3b8;margin-top:8px}

/* --- Services --- */
.service-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:#e2e8f0;border-radius:16px;overflow:hidden}
.svc{padding:44px 32px;background:#fff;transition:all 0.3s}
.svc:hover{background:#f8fafc;box-shadow:0 0 0 1px #2563eb inset}
.svc-icon{margin-bottom:20px;color:#2563eb}
.svc h3{font-size:17px;font-weight:600;color:#0f172a;margin-bottom:8px}
.svc p{font-size:13px;color:#64748b;line-height:1.6}

/* --- Cases --- */
.cases{background:#f8fafc}
.case-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.case{background:#fff;border-radius:14px;overflow:hidden;box-shadow:0 1px 3px rgba(0,0,0,0.04);transition:all 0.3s}
.case:hover{box-shadow:0 12px 40px rgba(0,0,0,0.08);transform:translateY(-2px)}
.case-img{height:220px;position:relative;overflow:hidden;display:flex;align-items:flex-start;justify-content:center;padding:20px}
.c1{background:#f0f4ff}
.c2{background:#fdf2f8}
.c3{background:#ecfdf5}
.c4{background:#fffbeb}
.case-info{padding:22px 24px 26px}
.case-tag{display:inline-block;font-size:11px;color:#2563eb;background:#eff6ff;padding:3px 10px;border-radius:100px;font-weight:600;margin-bottom:10px}
.case-info h3{font-size:18px;font-weight:600;color:#0f172a;margin-bottom:4px}
.case-info p{font-size:13px;color:#94a3b8}

/* Case mockups */
.case-mockup{width:100%;max-width:340px;background:#fff;border-radius:8px;box-shadow:0 4px 16px rgba(0,0,0,0.06);overflow:hidden}
.cm-bar{display:flex;gap:5px;padding:8px 10px;background:#f1f5f9;border-bottom:1px solid #e2e8f0}
.cm-bar span{width:7px;height:7px;border-radius:50%;background:#cbd5e1}
.cm-bar span:nth-child(1){background:#ef4444}
.cm-bar span:nth-child(2){background:#f59e0b}
.cm-bar span:nth-child(3){background:#22c55e}
.cm-body{padding:14px}
.cm-table{font-size:9px;color:#334155}
.cm-tr{display:flex;gap:6px;padding:5px 6px;border-bottom:1px solid #f1f5f9}
.cm-tr.head{background:#f8fafc;color:#94a3b8;font-weight:600;border-radius:4px;margin-bottom:2px}
.cm-tr span{flex:1}
.cm-badge{font-size:7px;padding:1px 6px;border-radius:100px;font-weight:600;flex:none!important}
.cm-badge.g{background:#d1fae5;color:#065f46}
.cm-badge.b{background:#dbeafe;color:#1e40af}
.cm-badge.o{background:#ffedd5;color:#9a3412}

/* --- Contact --- */
.contact-wrap{display:grid;grid-template-columns:1fr 1fr;gap:70px;align-items:start}
.contact-items{display:flex;flex-direction:column;gap:20px}
.ci{display:flex;flex-direction:column;gap:2px}
.ci span:first-child{font-size:11px;text-transform:uppercase;letter-spacing:2px;color:#94a3b8;font-weight:600}
.ci a,.ci span:last-child{font-size:15px;color:#334155}
.ci a:hover{color:#2563eb}

.contact-form{background:#fff;border:1px solid #e2e8f0;border-radius:14px;padding:36px}
.contact-form label{display:block;margin-bottom:18px}
.contact-form label>span{display:block;font-size:12px;color:#64748b;margin-bottom:6px;font-weight:500}
.contact-form input,.contact-form textarea{width:100%;padding:12px 14px;border:1px solid #e2e8f0;border-radius:8px;font-size:14px;font-family:inherit;color:#0f172a;background:#f8fafc;outline:none;transition:0.2s;resize:vertical}
.contact-form input:focus,.contact-form textarea:focus{border-color:#2563eb;background:#fff;box-shadow:0 0 0 3px rgba(37,99,235,0.1)}
.contact-form input::placeholder,.contact-form textarea::placeholder{color:#cbd5e1}
.form-line{display:grid;grid-template-columns:1fr 1fr;gap:14px}

/* --- Footer --- */
.footer{background:#0f172a;color:#fff;padding:60px 0 28px}
.footer .logo{color:#fff}
.footer-top{display:flex;justify-content:space-between;margin-bottom:50px;gap:40px;flex-wrap:wrap}
.footer-nav{display:flex;gap:70px}
.footer-nav h4{font-size:12px;color:rgba(255,255,255,0.35);margin-bottom:14px;text-transform:uppercase;letter-spacing:1px;font-weight:600}
.footer-nav a{display:block;font-size:13px;color:rgba(255,255,255,0.5);margin-bottom:8px;transition:color 0.2s}
.footer-nav a:hover{color:#fff}
.footer-bottom{display:flex;justify-content:space-between;padding-top:22px;border-top:1px solid rgba(255,255,255,0.08);font-size:12px;color:rgba(255,255,255,0.25);gap:12px;flex-wrap:wrap}
.footer-bottom a{color:rgba(255,255,255,0.25);transition:color 0.2s}
.footer-bottom a:hover{color:rgba(255,255,255,0.5)}

/* --- Responsive --- */
@media(max-width:960px){
  .service-grid{grid-template-columns:repeat(2,1fr)}
  .case-grid{grid-template-columns:1fr}
  .contact-wrap{grid-template-columns:1fr;gap:50px}
  .stats{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:720px){
  .container{padding:0 24px}
  .section{padding:80px 0}
  .menu-btn{display:flex}
  .nav{position:fixed;top:0;right:-100%;width:260px;height:100vh;background:#fff;flex-direction:column;padding:100px 32px 40px;gap:28px;transition:right 0.35s ease;box-shadow:-10px 0 40px rgba(0,0,0,0.06);z-index:100}
  .nav.open{right:0}
  .nav a{font-size:18px}
  .service-grid{grid-template-columns:1fr}
  .stats{gap:16px}
  .stat-num{font-size:40px}
  .form-line{grid-template-columns:1fr}
  .footer-nav{gap:36px}
}
@media(max-width:480px){
  .stats{grid-template-columns:1fr 1fr}
  .hero h1{font-size:36px}
  .footer-top{flex-direction:column}
  .footer-nav{flex-direction:column;gap:24px}
  .footer-bottom{flex-direction:column;text-align:center}
}