/* =====================================================
   Aperflu — shared stylesheet (EN & ZH)
   ===================================================== */
:root{
  --navy:#0A1628;
  --navy-2:#0F2036;
  --accent:#2F7DF6;
  --accent-dark:#1B5FD9;
  --text:#1C2B3A;
  --text-light:#5A6B7E;
  --line:#E3E9F0;
  --bg:#FFFFFF;
  --bg-soft:#F6F9FC;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:'Inter','Noto Sans SC',-apple-system,BlinkMacSystemFont,'PingFang SC','Microsoft YaHei',sans-serif;
  color:var(--text);background:var(--bg);
  -webkit-font-smoothing:antialiased;line-height:1.7;
}
html[lang="zh-CN"] body{line-height:1.85}
img{display:block;max-width:100%}
a{text-decoration:none;color:inherit}
.container{max-width:1200px;margin:0 auto;padding:0 24px}

/* ===== NAV ===== */
.nav{position:fixed;top:0;left:0;right:0;z-index:100;
  background:rgba(255,255,255,.92);backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:74px;gap:16px}
.logo{display:flex;align-items:center;flex-shrink:0}
.logo-text{display:flex;flex-direction:column;line-height:1.05}
.logo-name{font-size:24px;font-weight:700;letter-spacing:.01em;color:var(--navy)}
.logo-name b{color:var(--accent);font-weight:700}
.logo-sub{font-size:11.5px;font-weight:500;letter-spacing:.15em;color:var(--text-light);margin-top:6px;white-space:nowrap}
.nav-right{display:flex;align-items:center;gap:26px}
.nav-links{display:flex;gap:28px;align-items:center}
.nav-links a{font-size:14px;font-weight:500;color:var(--text-light);transition:color .22s ease}
.nav-links a:not(.nav-cta){position:relative;padding:6px 0}
.nav-links a:not(.nav-cta)::after{content:'';position:absolute;left:0;right:0;bottom:-1px;height:2px;
  border-radius:2px;background:var(--accent);transform:scaleX(0);transform-origin:left center;
  transition:transform .26s cubic-bezier(.2,.7,.3,1)}
.nav-links a:not(.nav-cta):hover{color:var(--navy)}
.nav-links a:not(.nav-cta):hover::after{transform:scaleX(.55)}
.nav-links a.is-active{color:var(--navy)}
.nav-links a.is-active::after{transform:scaleX(1)}
.nav-links a.is-active:hover::after{transform:scaleX(1)}
.nav-links a:focus-visible{outline:2px solid var(--accent);outline-offset:5px;border-radius:2px}
.nav-cta{background:var(--navy);color:#fff !important;
  padding:8px 20px;border-radius:6px;font-size:13px !important;
  transition:background .2s !important}
.nav-cta:hover{background:var(--accent-dark)}
.lang-switch{display:flex;align-items:center;gap:2px;
  border:1px solid var(--line);border-radius:6px;padding:2px}
.lang-switch a{font-size:12.5px;font-weight:600;padding:4px 10px;border-radius:4px;
  color:var(--text-light);transition:all .2s}
.lang-switch a.active{background:var(--navy);color:#fff}
.lang-switch a:not(.active):hover{color:var(--navy);background:var(--bg-soft)}
.nav-burger{display:none;background:none;border:none;cursor:pointer;padding:6px}
.nav-burger span{display:block;width:20px;height:2px;background:var(--navy);margin:4px 0;border-radius:2px}

/* ===== HERO ===== */
.hero{position:relative;min-height:100vh;display:flex;align-items:center;
  background:var(--navy);overflow:hidden}
.hero-bg{position:absolute;inset:0;background:url('../images/hero.jpg') center/cover no-repeat;opacity:.34}
.hero-overlay{position:absolute;inset:0;
  background:linear-gradient(105deg, rgba(10,22,40,.96) 0%, rgba(10,22,40,.84) 45%, rgba(10,22,40,.5) 100%)}
.hero-content{position:relative;z-index:2;width:100%;padding-top:74px}
.hero-eyebrow{display:inline-flex;align-items:center;gap:8px;
  font-size:12px;font-weight:600;letter-spacing:.22em;text-transform:uppercase;
  color:#8FB8F5;margin-bottom:28px}
.hero-eyebrow::before{content:'';width:32px;height:1px;background:#8FB8F5;display:inline-block}
.hero h1{font-size:clamp(40px,6vw,72px);font-weight:700;color:#fff;line-height:1.12;
  letter-spacing:-.02em;margin-bottom:12px}
.hero h1 em{font-style:normal;color:#5A9CF8;font-weight:300}
.hero-sub{font-size:clamp(16px,2vw,20px);color:#D6E1EE;max-width:660px;margin-bottom:16px;font-weight:300}
.hero-note{font-size:14px;color:#ACBFD5;letter-spacing:.04em;margin-bottom:44px;max-width:620px}
.hero-actions{display:flex;gap:16px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:8px;padding:14px 32px;border-radius:6px;
  font-size:15px;font-weight:600;transition:all .25s}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:var(--accent-dark);transform:translateY(-2px)}
.btn-ghost{border:1px solid rgba(255,255,255,.3);color:#fff}
.btn-ghost:hover{border-color:#fff;background:rgba(255,255,255,.08)}
.hero-stats{position:relative;z-index:2;margin-top:88px;padding:36px 0 48px;
  border-top:1px solid rgba(255,255,255,.12);
  display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.stat-num{font-size:clamp(28px,3.4vw,40px);font-weight:700;color:#fff;letter-spacing:-.01em}
.stat-num sub{font-size:.45em;color:#5A9CF8;vertical-align:baseline;margin-left:2px}
.stat-label{font-size:13px;color:#A9BDD4;margin-top:4px}

/* ===== SECTION ===== */
.section{padding:110px 0}
.section-soft{background:var(--bg-soft)}
.section-head{max-width:680px;margin-bottom:64px}
.section-tag{font-size:12px;font-weight:600;letter-spacing:.2em;text-transform:uppercase;
  color:var(--accent);margin-bottom:16px;display:block}
.section-title{font-size:clamp(28px,4vw,42px);font-weight:700;color:var(--navy);
  letter-spacing:-.015em;line-height:1.2;margin-bottom:16px}
.section-desc{font-size:16px;color:var(--text-light);font-weight:300}

/* ===== ABOUT ===== */
.about-grid{display:grid;grid-template-columns:1.05fr 1fr;gap:72px;align-items:center}
.about-visual{position:relative}
.about-visual img{border-radius:12px;width:100%;object-fit:cover;aspect-ratio:16/7}
.about-badge{position:absolute;right:-20px;bottom:-20px;background:var(--navy);color:#fff;
  border-radius:12px;padding:22px 28px;min-width:190px}
.about-badge b{display:block;font-size:26px;color:#5A9CF8;font-weight:700}
.about-badge span{font-size:12px;color:#9DB1C7;line-height:1.5;display:block;margin-top:4px}
.oring-strip{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-top:56px}
.oring-strip figure{margin:0}
.oring-strip img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:14px;display:block;
  box-shadow:0 4px 20px rgba(10,22,40,.07);transition:transform .5s cubic-bezier(.2,.7,.3,1)}
.oring-strip figure:hover img{transform:translateY(-4px)}
.oring-strip figcaption{font-size:12.5px;color:var(--text-light);margin-top:10px;letter-spacing:.02em}
.feature-list{display:flex;flex-direction:column;gap:0;margin-top:8px}
.feature-item{display:flex;gap:20px;padding:22px 0;border-bottom:1px solid var(--line)}
.feature-item:last-child{border-bottom:none}
.feature-icon{flex-shrink:0;width:44px;height:44px;border-radius:10px;
  background:#EAF2FE;color:var(--accent);display:flex;align-items:center;justify-content:center}
.feature-icon svg{width:22px;height:22px}
.feature-item h4{font-size:16px;font-weight:600;color:var(--navy);margin-bottom:4px}
.feature-item p{font-size:14px;color:var(--text-light);font-weight:300}

/* ===== PERF CARDS ===== */
.perf-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.perf-card{background:#fff;border:1px solid var(--line);border-radius:12px;
  padding:32px 28px;transition:all .3s;position:relative;overflow:hidden}
.perf-card::before{content:'';position:absolute;top:0;left:0;right:0;height:3px;
  background:var(--accent);transform:scaleX(0);transform-origin:left;transition:transform .3s}
.perf-card:hover{transform:translateY(-6px);box-shadow:0 20px 44px rgba(10,22,40,.09);border-color:transparent}
.perf-card:hover::before{transform:scaleX(1)}
.perf-num{font-size:44px;font-weight:700;color:var(--navy);letter-spacing:-.02em;line-height:1}
.perf-num small{font-size:16px;font-weight:500;color:var(--accent);margin-left:4px}
.perf-title{font-size:15px;font-weight:600;color:var(--navy);margin:14px 0 6px}
.perf-desc{font-size:13px;color:var(--text-light);font-weight:300}

/* ===== TABLE ===== */
.table-wrap{background:#fff;border:1px solid var(--line);border-radius:14px;
  overflow-x:auto;box-shadow:0 4px 24px rgba(10,22,40,.04)}
table{width:100%;border-collapse:collapse;min-width:820px}
thead th{background:var(--navy);color:#fff;font-size:12.5px;font-weight:600;
  letter-spacing:.03em;padding:16px 18px;text-align:left;white-space:nowrap}
thead th small{display:block;font-weight:400;font-size:10.5px;color:#8FA6C0;margin-top:2px;letter-spacing:.02em}
tbody td{padding:16px 18px;font-size:14px;border-bottom:1px solid var(--line);vertical-align:top;white-space:nowrap}
tbody tr:last-child td{border-bottom:none}
tbody tr{transition:background .15s}
tbody tr:hover{background:#F4F8FE}
.grade-name{font-weight:700;color:var(--accent-dark);font-size:15px}
.td-note{white-space:normal;font-size:12px;color:var(--text-light);min-width:230px}
.grade-pill{display:inline-block;background:#EAF2FE;color:var(--accent-dark);
  font-size:11px;font-weight:600;padding:3px 10px;border-radius:20px;margin-top:6px}
.table-foot{font-size:12.5px;color:var(--text-light);margin-top:16px;display:flex;gap:8px;align-items:flex-start}
.table-foot svg{flex-shrink:0;margin-top:2px}

/* ===== APPLICATIONS ===== */
.app-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.app-card{background:#fff;border:1px solid var(--line);border-radius:12px;
  padding:30px 26px;transition:all .3s}
.app-card:hover{transform:translateY(-5px);box-shadow:0 16px 36px rgba(10,22,40,.08);border-color:transparent}
.app-icon{width:48px;height:48px;border-radius:12px;margin-bottom:20px;
  display:flex;align-items:center;justify-content:center}
.app-icon svg{width:24px;height:24px}
.app-card h4{font-size:16px;font-weight:600;color:var(--navy);margin-bottom:8px}
.app-card p{font-size:13.5px;color:var(--text-light);font-weight:300}
.i-blue{background:#EAF2FE;color:var(--accent)}
.i-teal{background:#E1F5EE;color:#0F6E56}
.i-amber{background:#FAEEDA;color:#854F0B}
.i-purple{background:#EEEDFE;color:#534AB7}

/* ===== WHY / BAND ===== */
.why-band{position:relative;overflow:hidden;padding:120px 0;background:var(--navy)}
.why-band::before{content:'';position:absolute;inset:0;
  background:url('../images/industry.jpg') center/cover no-repeat;opacity:.16}
.why-band::after{content:'';position:absolute;inset:0;
  background:linear-gradient(100deg,rgba(10,22,40,.9) 0%,rgba(10,22,40,.68) 55%,rgba(10,22,40,.5) 100%)}
.why-inner{position:relative;z-index:2}
.why-inner .section-title,.why-inner .section-desc{color:#fff}
.why-inner .section-desc{color:#A9BAD1}
.why-points{display:grid;grid-template-columns:repeat(3,1fr);gap:32px;margin-top:56px}
.why-point{border-top:2px solid var(--accent);padding-top:22px}
.why-point b{display:block;font-size:17px;font-weight:600;color:#fff;margin-bottom:8px}
.why-point p{font-size:14px;color:#A9BAD1;font-weight:300}

/* ===== CTA ===== */
.cta-band{background:var(--navy);position:relative;overflow:hidden;padding:96px 0}
.cta-inner{position:relative;z-index:2;text-align:center;max-width:720px;margin:0 auto}
.cta-inner h2{font-size:clamp(28px,4vw,40px);font-weight:700;color:#fff;
  letter-spacing:-.015em;margin-bottom:16px}
.cta-inner p{font-size:16px;color:#9DB1C7;font-weight:300;margin-bottom:36px}

/* ===== FOOTER ===== */
.footer{background:#060F1D;padding:56px 0 32px}
.footer-grid{display:flex;justify-content:space-between;gap:40px;flex-wrap:wrap;
  padding-bottom:40px;border-bottom:1px solid rgba(255,255,255,.08)}
.footer .logo-name{color:#fff}
.footer .logo-sub{color:#7C8FA6}
.footer-info{font-size:13px;color:#6E829B;max-width:340px;margin-top:14px;font-weight:300}
.footer-col h5{font-size:13px;font-weight:600;color:#DCE5F0;margin-bottom:16px;letter-spacing:.05em}
.footer-col a{display:block;font-size:13px;color:#6E829B;margin-bottom:10px;transition:color .2s}
.footer-col a:hover{color:#8FB8F5}
.footer-bottom{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
  padding-top:26px;font-size:12.5px;color:#4E5F76}

/* ===== ANIM ===== */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}

/* ===== RESPONSIVE ===== */
@media(max-width:1020px){
  .nav-links{gap:18px}
  .logo-name{font-size:21px}
  .logo-sub{font-size:10.5px;letter-spacing:.12em}
  .oring-strip{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:960px){
  .about-grid{grid-template-columns:1fr;gap:48px}
  .perf-grid{grid-template-columns:repeat(2,1fr)}
  .app-grid{grid-template-columns:repeat(2,1fr)}
  .hero-stats{grid-template-columns:repeat(2,1fr);gap:32px 16px}
  .why-points{grid-template-columns:1fr;gap:24px}
}
@media(max-width:840px){
  .nav-links{display:none;position:absolute;top:74px;left:0;right:0;background:#fff;
    border-bottom:1px solid var(--line);flex-direction:column;padding:20px 24px;gap:18px;align-items:flex-start}
  .nav-links.open{display:flex}
  .nav-links a:not(.nav-cta){padding:4px 0 4px 14px;border-left:2px solid transparent;
    transition:color .2s ease,border-color .2s ease,padding-left .2s ease}
  .nav-links a:not(.nav-cta)::after{display:none}
  .nav-links a:not(.nav-cta):hover{border-left-color:#D6E2F2;padding-left:18px}
  .nav-links a.is-active{border-left-color:var(--accent);padding-left:18px;font-weight:600;color:var(--accent-dark)}
  .nav-burger{display:block}
  .lang-switch{margin-left:auto}
}
@media(max-width:640px){
  .section{padding:72px 0}
  .oring-strip{grid-template-columns:1fr;gap:28px}
  .logo-name{font-size:20px}
  .logo-sub{font-size:10px;letter-spacing:.12em;margin-top:5px}
  .perf-grid{grid-template-columns:1fr}
  .app-grid{grid-template-columns:1fr}
  .hero-stats{grid-template-columns:repeat(2,1fr)}
  .about-badge{right:12px;bottom:-16px;padding:16px 20px}
}