/* ============================================
   CNSTECH About Us — about.css
   Dark technical base · Cyan accent · No deps
   ============================================ */

/* --- Reset & Base --- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg:#0d1117;
  --bg-card:#161b22;
  --bg-card-hover:#1c2129;
  --cyan:#00e5ff;
  --cyan-dim:rgba(0,229,255,.15);
  --cyan-glow:rgba(0,229,255,.35);
  --text:#e6edf3;
  --text-dim:#8b949e;
  --border:#21262d;
  --radius:8px;
  --max-w:1200px;
  --header-h:64px;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;
}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:var(--font);background:var(--bg);color:var(--text);line-height:1.65;overflow-x:hidden}
img{display:block;max-width:100%;height:auto}
a{color:var(--cyan);text-decoration:none;transition:color .2s}
a:hover{color:#fff}
.container{max-width:var(--max-w);margin:0 auto;padding:0 24px}

/* --- Buttons --- */
.btn{display:inline-block;padding:12px 28px;border-radius:var(--radius);font-weight:600;font-size:.95rem;transition:all .25s;cursor:pointer;border:none;text-align:center}
.btn-primary{background:var(--cyan);color:var(--bg);box-shadow:0 0 16px rgba(0,229,255,.25)}
.btn-primary:hover{background:#fff;color:var(--bg);box-shadow:0 0 24px rgba(0,229,255,.4)}
.btn-secondary{background:transparent;color:var(--cyan);border:1.5px solid var(--cyan)}
.btn-secondary:hover{background:var(--cyan-dim);color:#fff}

/* ========== HEADER ========== */
.site-header{position:sticky;top:0;z-index:100;background:rgba(13,17,23,.92);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--border);height:var(--header-h)}
.header-inner{max-width:var(--max-w);margin:0 auto;padding:0 24px;display:flex;align-items:center;justify-content:space-between;height:100%}
.logo-link{display:flex;align-items:center;flex-shrink:0}
.logo-img{width:auto;height:32px}
.main-nav{display:flex;gap:32px}
.main-nav a{color:var(--text-dim);font-size:.9rem;font-weight:500;padding:6px 12px;border-radius:6px;transition:color .2s,background .2s;text-decoration:none}
.main-nav a:hover{color:#fff}

/* Hamburger */
.mobile-menu-btn{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:8px}
.hamburger-line{width:22px;height:2px;background:var(--text);border-radius:2px;transition:all .3s}

/* ========== HERO ========== */
.hero{position:relative;overflow:hidden;padding:100px 0 80px;min-height:70vh;display:flex;align-items:center}

/* Grid overlay */
.hero-grid-overlay{position:absolute;inset:0;background-image:
  linear-gradient(rgba(0,229,255,.04) 1px,transparent 1px),
  linear-gradient(90deg,rgba(0,229,255,.04) 1px,transparent 1px);
  background-size:60px 60px;
  animation:gridDrift 25s linear infinite;
  pointer-events:none}

/* Sweep line */
.hero-sweep{position:absolute;top:0;left:-100%;width:100%;height:2px;background:linear-gradient(90deg,transparent,var(--cyan),transparent);animation:sweep 6s ease-in-out infinite;pointer-events:none}

.hero-inner{max-width:var(--max-w);margin:0 auto;padding:0 24px;display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center;position:relative;z-index:1}
.eyebrow{display:inline-block;font-size:.75rem;letter-spacing:3px;color:var(--cyan);font-weight:600;margin-bottom:12px}
.hero h1{font-size:clamp(1.6rem,3.5vw,2.6rem);font-weight:700;line-height:1.25;margin-bottom:20px}
.hero-intro{font-size:1.05rem;color:var(--text);margin-bottom:12px}
.hero-detail{font-size:.92rem;color:var(--text-dim);margin-bottom:28px}
.hero-ctas{display:flex;gap:16px;flex-wrap:wrap;margin-bottom:28px}

/* Status chips */
.hero-chips{display:flex;gap:12px;flex-wrap:wrap}
.chip{display:inline-flex;align-items:center;gap:6px;padding:5px 14px;border:1px solid var(--border);border-radius:20px;font-size:.75rem;color:var(--text-dim);background:var(--bg-card)}
.chip-led{width:6px;height:6px;border-radius:50%;background:var(--cyan);box-shadow:0 0 6px var(--cyan);animation:ledPulse 2.5s ease-in-out infinite}

/* Hero image */
.hero-visual{position:relative;border-radius:var(--radius);overflow:hidden}
.hero-visual img{width:100%;border-radius:var(--radius)}
.hero-img-overlay{position:absolute;inset:0;background:linear-gradient(135deg,rgba(0,229,255,.08) 0%,transparent 60%);pointer-events:none}

/* ========== SNAPSHOT ========== */
.snapshot{padding:56px 0;border-bottom:1px solid var(--border)}
.snapshot-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.snapshot-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:24px;text-align:center;transition:border-color .3s,box-shadow .3s}
.snapshot-card:hover{border-color:var(--cyan);box-shadow:0 0 20px rgba(0,229,255,.1)}
.snapshot-icon{color:var(--cyan);margin:0 auto 12px}
.snapshot-label{font-size:.9rem;font-weight:500}

/* ========== SERVICES ========== */
.services-section{padding:80px 0}
.services-section h2{text-align:center;font-size:clamp(1.4rem,2.5vw,2rem);margin-bottom:48px}
.services-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.service-card{display:block;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:32px 28px;position:relative;overflow:hidden;color:inherit;text-decoration:none;transition:border-color .3s,transform .25s,box-shadow .25s}
.service-card::after{content:"";position:absolute;bottom:0;left:0;width:0;height:2px;background:var(--cyan);transition:width .4s}
.service-card:hover,.service-card:focus-visible{border-color:rgba(0,229,255,.4);transform:translateY(-3px);box-shadow:0 16px 36px rgba(0,0,0,.22)}
.service-card:hover::after,.service-card:focus-visible::after{width:100%}
.service-card:focus-visible{outline:2px solid var(--cyan);outline-offset:4px}
.service-icon{color:var(--cyan);margin-bottom:16px}
.service-card h3{font-size:1.05rem;margin-bottom:10px;font-weight:600}
.service-card p{font-size:.88rem;color:var(--text-dim);line-height:1.6}

/* ========== PROCESS ========== */
.process-section{padding:80px 0;background:var(--bg-card);border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.process-section h2{text-align:center;font-size:clamp(1.4rem,2.5vw,2rem);margin-bottom:56px}
.process-track{position:relative}
.process-steps{display:flex;gap:0;justify-content:space-between;position:relative;z-index:1}
.process-step{flex:1;text-align:center;padding:0 16px}
.step-num{display:inline-block;font-size:1.6rem;font-weight:700;color:var(--cyan);margin-bottom:10px;font-variant-numeric:tabular-nums}
.process-step h3{font-size:.95rem;margin-bottom:8px;font-weight:600}
.process-step p{font-size:.84rem;color:var(--text-dim);line-height:1.55}

/* Horizontal connecting line */
.process-line{position:absolute;top:18px;left:10%;right:10%;height:2px;background:var(--border);z-index:0}
.process-dot{position:absolute;top:-3px;width:8px;height:8px;border-radius:50%;background:var(--cyan);box-shadow:0 0 8px var(--cyan);animation:packetMove 4s linear infinite}

/* ========== WHY CNSTECH ========== */
.why-section{padding:80px 0}
.why-split{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.why-image-wrap{position:relative;border-radius:var(--radius);overflow:hidden}
.why-image-wrap img{width:100%;border-radius:var(--radius)}

/* Corner brackets */
.why-img-brackets{position:absolute;inset:12px;border:1.5px solid transparent;border-radius:4px;pointer-events:none}
.why-img-brackets::before,.why-img-brackets::after{content:"";position:absolute;width:28px;height:28px;border-color:var(--cyan);border-style:solid;border-width:0}
.why-img-brackets::before{top:0;left:0;border-top-width:1.5px;border-left-width:1.5px}
.why-img-brackets::after{bottom:0;right:0;border-bottom-width:1.5px;border-right-width:1.5px}

/* Scanline */
.why-img-scanline{position:absolute;inset:0;background:repeating-linear-gradient(0deg,transparent,transparent 3px,rgba(0,229,255,.03) 3px,rgba(0,229,255,.03) 4px);pointer-events:none;animation:scanlineDrift 8s linear infinite}

.why-content h2{font-size:clamp(1.4rem,2.5vw,2rem);margin-bottom:28px}
.why-list{list-style:none;display:flex;flex-direction:column;gap:16px}
.why-list li{display:flex;align-items:flex-start;gap:12px;font-size:.95rem;line-height:1.55}
.why-list svg{flex-shrink:0;color:var(--cyan);margin-top:2px}

/* ========== SERVICE LINKS ========== */
.service-links-section{padding:64px 0;background:var(--bg-card);border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.service-links-section h2{text-align:center;font-size:clamp(1.2rem,2vw,1.6rem);margin-bottom:32px}
.service-links-grid{display:flex;flex-wrap:wrap;gap:12px;justify-content:center}
.service-links-grid a{padding:8px 20px;border:1px solid var(--border);border-radius:20px;font-size:.85rem;color:var(--text-dim);transition:all .25s}
.service-links-grid a:hover{border-color:var(--cyan);color:var(--cyan);background:var(--cyan-dim)}

/* ========== FAQ ========== */
.faq-section{padding:80px 0}
.faq-section h2{text-align:center;font-size:clamp(1.4rem,2.5vw,2rem);margin-bottom:40px}
.faq-list{max-width:780px;margin:0 auto}
.faq-item{border:1px solid var(--border);border-radius:var(--radius);margin-bottom:12px;background:var(--bg-card);overflow:hidden;transition:border-color .3s}
.faq-item[open]{border-color:rgba(0,229,255,.3)}
.faq-item summary{padding:18px 24px;font-weight:600;font-size:.95rem;cursor:pointer;list-style:none;display:flex;align-items:center;justify-content:space-between;transition:color .2s}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";font-size:1.2rem;color:var(--cyan);transition:transform .3s;font-weight:400}
.faq-item[open] summary::after{transform:rotate(45deg)}
.faq-item summary:hover{color:var(--cyan)}
.faq-answer{padding:0 24px 18px;font-size:.9rem;color:var(--text-dim);line-height:1.65}
.faq-answer a{color:var(--cyan)}

/* ========== FINAL CTA ========== */
.final-cta{padding:80px 0;text-align:center;background:linear-gradient(180deg,var(--bg) 0%,rgba(0,229,255,.04) 100%);border-top:1px solid var(--border)}
.final-cta h2{font-size:clamp(1.4rem,2.5vw,2rem);margin-bottom:16px;max-width:700px;margin-left:auto;margin-right:auto}
.final-cta p{color:var(--text-dim);margin-bottom:32px;max-width:600px;margin-left:auto;margin-right:auto;font-size:.95rem}
.cta-buttons{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}

/* ========== FOOTER ========== */
.site-footer{background:#080b10;border-top:1px solid var(--border);padding:56px 0 0}
.footer-inner{max-width:var(--max-w);margin:0 auto;padding:0 24px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px;padding-bottom:40px}
.footer-col h4{font-size:.85rem;text-transform:uppercase;letter-spacing:1.5px;color:var(--text-dim);margin-bottom:16px}
.footer-col nav{display:flex;flex-direction:column;gap:10px}
.footer-col nav a{color:var(--text-dim);font-size:.88rem;transition:color .2s;text-decoration:none}
.footer-col nav a:hover{color:var(--cyan)}
.footer-col address{font-style:normal;display:flex;flex-direction:column;gap:10px}
.footer-col address a,.footer-col address span{color:var(--text-dim);font-size:.88rem;text-decoration:none;transition:color .2s}
.footer-col address a:hover{color:var(--cyan)}
.footer-brand p{color:var(--text-dim);font-size:.85rem;margin:14px 0 18px;line-height:1.55}
.footer-brand img{height:28px;width:auto}

.google-review-btn{display:inline-flex;align-items:center;gap:8px;padding:8px 16px;border:1px solid var(--border);border-radius:var(--radius);font-size:.82rem;color:var(--text-dim);transition:all .25s}
.google-review-btn:hover{border-color:var(--cyan);color:var(--cyan)}

.footer-social{display:flex;gap:16px;justify-content:center;padding:28px 0;border-top:1px solid var(--border)}
.footer-social a{color:var(--text-dim);transition:color .2s}
.footer-social a:hover{color:var(--cyan)}

.footer-bottom{display:flex;justify-content:space-between;align-items:center;padding:20px 0;border-top:1px solid var(--border);font-size:.8rem;color:var(--text-dim)}
.footer-bottom a{color:var(--text-dim);transition:color .2s}
.footer-bottom a:hover{color:var(--cyan)}

/* ========== ANIMATIONS ========== */
@keyframes gridDrift{
  0%{background-position:0 0}
  100%{background-position:60px 60px}
}
@keyframes sweep{
  0%{left:-100%;opacity:0}
  10%{opacity:1}
  90%{opacity:1}
  100%{left:100%;opacity:0}
}
@keyframes ledPulse{
  0%,100%{opacity:1;box-shadow:0 0 6px var(--cyan)}
  50%{opacity:.4;box-shadow:0 0 2px var(--cyan)}
}
@keyframes packetMove{
  0%{left:0}
  100%{left:calc(100% - 8px)}
}
@keyframes scanlineDrift{
  0%{background-position:0 0}
  100%{background-position:0 40px}
}

/* Scroll reveal enhancement: content stays visible even if JS or observers fail. */
.reveal{opacity:1;transform:none;transition:opacity .6s ease,transform .6s ease}
.reveal.visible{opacity:1;transform:none}

/* Focus visible */
:focus-visible{outline:2px solid var(--cyan);outline-offset:2px;border-radius:4px}

/* ========== REDUCED MOTION ========== */
@media (prefers-reduced-motion:reduce){
  .hero-grid-overlay,.hero-sweep,.process-dot,.why-img-scanline{animation:none!important}
  .chip-led{animation:none!important;opacity:1}
  .reveal{opacity:1;transform:none;transition:none}
  html{scroll-behavior:auto}
}

/* ========== RESPONSIVE ========== */

/* Tablet */
@media (max-width:960px){
  .hero-inner{grid-template-columns:1fr;text-align:center}
  .hero-ctas{justify-content:center}
  .hero-chips{justify-content:center}
  .hero-visual{max-width:600px;margin:32px auto 0}
  .snapshot-grid{grid-template-columns:repeat(2,1fr)}
  .services-grid{grid-template-columns:repeat(2,1fr)}
  .process-steps{flex-direction:column;gap:28px}
  .process-line{display:none}
  .process-step{text-align:left;padding:0;display:flex;gap:16px;align-items:flex-start}
  .step-num{font-size:1.3rem;min-width:36px}
  .process-step h3{margin-bottom:4px}
  .why-split{grid-template-columns:1fr}
  .why-image-wrap{max-width:560px;margin:0 auto}
  .why-content{text-align:left}
  .footer-grid{grid-template-columns:1fr 1fr}
}

/* Mobile */
@media (max-width:640px){
  :root{--header-h:56px}
  .main-nav{display:none;position:absolute;top:var(--header-h);left:0;right:0;background:rgba(13,17,23,.98);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);flex-direction:column;padding:16px 24px;gap:4px;border-bottom:1px solid var(--border)}
  .main-nav.open{display:flex}
  .main-nav a{padding:12px 0;font-size:1rem}
  .mobile-menu-btn{display:flex}
  .mobile-menu-btn.active .hamburger-line:nth-child(1){transform:rotate(45deg) translate(5px,5px)}
  .mobile-menu-btn.active .hamburger-line:nth-child(2){opacity:0}
  .mobile-menu-btn.active .hamburger-line:nth-child(3){transform:rotate(-45deg) translate(5px,-5px)}
  .hero{padding:80px 0 56px;min-height:auto}
  .hero h1{font-size:1.5rem}
  .snapshot-grid{grid-template-columns:1fr 1fr}
  .services-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column;gap:8px;text-align:center}
  .cta-buttons{flex-direction:column;align-items:center}
  .cta-buttons .btn{width:100%;max-width:300px}
}