/* NCTTI company website — premium minimalist (Phase 2)
   DESIGN-SPEC.md · tokens consumed by shohayok.js — DO NOT rename/remove/alter */
:root{
  --bg:#0a0f1e; --bg2:#0d1428; --card:#111a30; --card2:#0f1730;
  --line:#1e2a4a; --txt:#e9edf7; --mut:#9aa5c0;
  --acc:#3b82f6; --acc2:#60a5fa; --gold:#f5b942; --green:#34d399;
  --rad:14px;
  --space-sec:clamp(5.5rem,11vw,8.75rem);
}

/* ---------- reset / base ---------- */
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--txt);
  font-family:'Segoe UI',system-ui,-apple-system,'Noto Sans Bengali','Hind Siliguri',sans-serif;
  font-size:1.0625rem;line-height:1.7;overflow-x:hidden;
  -webkit-font-smoothing:antialiased}
h1,h2,h3{line-height:1.25;font-weight:700;letter-spacing:-0.02em}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
::selection{background:rgba(59,130,246,.35)}

:focus-visible{outline:2px solid var(--acc2);outline-offset:3px;border-radius:6px}

/* skip link — visually hidden until focused */
.skip{position:absolute;left:16px;top:-64px;z-index:100;background:var(--acc);color:#fff;
  padding:10px 18px;border-radius:10px;font-weight:600;font-size:.9375rem;transition:top .2s}
.skip:focus{top:12px}

.wrap{max-width:1200px;margin:0 auto;padding:0 24px}
section{padding:var(--space-sec) 0}

.eyebrow{display:inline-block;font-size:12px;letter-spacing:3px;text-transform:uppercase;
  color:var(--acc2);border:1px solid var(--line);padding:7px 15px;border-radius:999px;
  margin-bottom:20px;background:rgba(59,130,246,.08)}
h2.sec{font-size:clamp(1.875rem,4vw,2.75rem);line-height:1.2;margin:0 0 16px}
p.lead{color:var(--mut);max-width:640px;font-size:1.0625rem;margin-bottom:56px}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:15px 30px;border-radius:12px;font-weight:600;font-size:1rem;
  color:#fff!important;background:var(--acc);border:1px solid transparent;
  cursor:pointer;transition:transform .2s ease,box-shadow .2s ease,background .2s ease;
  min-height:52px;text-decoration:none}
.btn:hover{background:#2f6fe4;transform:translateY(-2px);box-shadow:0 12px 32px rgba(59,130,246,.35)}
.btn.ghost{background:rgba(255,255,255,.04);border:1px solid var(--line);color:var(--txt)!important;box-shadow:none}
.btn.ghost:hover{border-color:var(--acc2);background:rgba(96,165,250,.08)}
.btn.sm{padding:10px 20px;font-size:.9375rem;min-height:44px;border-radius:10px}
.btn[disabled]{opacity:.55;cursor:not-allowed;transform:none!important;box-shadow:none!important}

/* ---------- nav ---------- */
nav{position:sticky;top:0;z-index:50;backdrop-filter:blur(16px) saturate(1.2);
  -webkit-backdrop-filter:blur(16px) saturate(1.2);
  background:color-mix(in srgb,var(--bg) 82%,transparent);
  border-bottom:1px solid var(--line)}
.nav-in{display:flex;align-items:center;justify-content:space-between;height:72px;position:relative}
.brand{display:flex;align-items:center;gap:12px}
.brand img{width:44px;height:44px;border-radius:10px;object-fit:cover;border:1px solid var(--line)}
.brand b{font-size:20px;letter-spacing:2px;font-weight:700}
.brand small{display:block;font-size:10px;color:var(--mut);letter-spacing:1px;font-weight:400}
.nav-links{display:flex;gap:26px;align-items:center;font-size:15px}
.nav-links a.nl{color:var(--mut);position:relative;transition:color .2s;padding:6px 0}
.nav-links a.nl::after{content:"";position:absolute;left:0;bottom:0;height:2px;width:100%;
  background:var(--acc2);transform:scaleX(0);transform-origin:left;transition:transform .25s ease}
.nav-links a.nl:hover{color:#fff}
.nav-links a.nl:hover::after{transform:scaleX(1)}
.burger{display:none;width:44px;height:44px;background:none;border:1px solid var(--line);
  border-radius:10px;color:#fff;font-size:20px;cursor:pointer;align-items:center;justify-content:center}

/* ---------- hero ---------- */
.hero{min-height:94svh;display:flex;align-items:center;position:relative;
  background:linear-gradient(rgba(7,11,25,.88),rgba(7,11,25,.55) 55%,rgba(7,11,25,.88)),
  url('assets/hero-banner.jpg') center 30%/cover no-repeat}
.hero .wrap{max-width:1200px}
.hero-col{max-width:820px}
.hero h1{font-size:clamp(2.5rem,6.5vw,4.5rem);line-height:1.15;letter-spacing:-0.025em;
  font-weight:700;margin:0 0 8px}
.hero h1 .grad{background:linear-gradient(120deg,#93c5fd,var(--acc2));
  -webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.sub{font-size:clamp(1.0625rem,2vw,1.1875rem);color:#c4cde4;max-width:620px;margin:24px 0 40px}
.hero-ctas{display:flex;gap:16px;flex-wrap:wrap}
.hero-meta{margin-top:56px;display:flex;gap:clamp(24px,5vw,56px);flex-wrap:wrap;
  border-top:1px solid rgba(255,255,255,.12);padding-top:28px;max-width:640px}
.hero-meta div{color:var(--mut);font-size:.875rem}
.hero-meta b{color:#fff;font-size:1.5rem;font-weight:700;display:block}

/* ---------- trust strip ---------- */
.trust{background:var(--bg2);border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:30px 0}
.trust-in{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;text-align:center}
.trust-in div{padding:0 18px}
.trust-in div+div{border-left:1px solid var(--line)}
.trust-in b{display:block;font-size:1rem;color:#fff;margin-bottom:4px;font-weight:700}
.trust-in span{color:var(--mut);font-size:.8125rem}

/* ---------- services ---------- */
.svc-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(320px,100%),1fr));gap:28px;margin-top:4px}
.svc{background:var(--card);border:1px solid var(--line);border-radius:var(--rad);
  overflow:hidden;display:flex;flex-direction:column;
  transition:transform .25s ease,border-color .25s ease,box-shadow .25s ease}
.svc:hover{transform:translateY(-4px);border-color:rgba(96,165,250,.5);box-shadow:0 20px 48px rgba(0,0,0,.45)}
.svc .im{aspect-ratio:16/10;overflow:hidden;background:var(--bg2);position:relative}
.svc .im img{width:100%;height:100%;object-fit:cover;transition:transform .5s ease}
.svc:hover .im img{transform:scale(1.04)}
.svc .im.glyph{background:linear-gradient(160deg,#14204a,#0c1330);
  display:flex;align-items:center;justify-content:center}
.svc .im.glyph svg{width:48px;height:48px;stroke:var(--acc2);fill:none;stroke-width:1.5}
.svc .bd{padding:28px;display:flex;flex-direction:column;flex:1}
.svc h3{font-size:clamp(1.25rem,2.4vw,1.5rem);line-height:1.3;font-weight:650;margin-bottom:4px}
.svc h3 .sub{font-weight:400;font-size:.875rem;color:var(--mut)}
.svc .price{color:var(--acc2);font-weight:700;font-size:1.125rem;margin:10px 0 6px}
.svc .price .suffix{font-size:.8125rem;color:var(--mut);font-weight:400}
.svc .tl{font-size:.8125rem;color:var(--mut);margin-bottom:14px}
.svc ul{list-style:none;color:var(--mut);font-size:.875rem;flex:1}
.svc ul li{padding:6px 0 6px 24px;position:relative}
.svc ul li::before{content:"▪";position:absolute;left:4px;color:var(--green);font-size:.75rem}
.svc.flagship{border:2px solid var(--gold);
  box-shadow:0 0 0 1px rgba(245,185,66,.25),0 20px 48px rgba(0,0,0,.45)}
.flag-badge{position:absolute;top:14px;right:14px;background:var(--gold);color:#1a1206;
  font-size:11px;font-weight:800;letter-spacing:2px;padding:7px 14px;border-radius:999px;z-index:2}

/* ---------- process ---------- */
.process{background:var(--bg2);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:4px;position:relative}
.step{background:var(--card);border:1px solid var(--line);border-radius:var(--rad);padding:32px 28px}
.step .ghost{font-size:48px;font-weight:800;color:rgba(96,165,250,.18);line-height:1;display:block}
.step .n{font-size:12px;color:var(--acc2);font-weight:700;letter-spacing:2px;display:block;margin:14px 0 8px}
.step h3{margin:0 0 8px;font-size:1.125rem;font-weight:650}
.step p{color:var(--mut);font-size:.875rem}

/* ---------- about ---------- */
.about-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:56px;align-items:center}
.about-grid p{color:var(--mut);font-size:1.0625rem;margin-bottom:14px}
.about-grid p .promise{color:#fff;font-weight:700}
.about-card{background:var(--card2);border:1px solid var(--line);border-radius:var(--rad);padding:36px}
.about-card h3{font-size:1.25rem;margin-bottom:18px}
.about-card li{list-style:none;color:var(--mut);font-size:.875rem;padding:7px 0 7px 26px;position:relative}
.about-card li::before{content:"◆";position:absolute;left:0;color:var(--acc);font-size:.75rem}

/* ---------- faq ---------- */
.faq{background:var(--bg2);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.faq .qwrap{max-width:780px;margin-top:4px}
.faq details{background:var(--card);border:1px solid var(--line);border-radius:12px;margin:0 0 14px;overflow:hidden}
.faq details[open]{border-color:rgba(96,165,250,.45)}
.faq summary{padding:20px 24px;padding-right:48px;cursor:pointer;font-weight:600;font-size:1.0625rem;
  list-style:none;display:flex;justify-content:space-between;align-items:center;position:relative}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"";position:absolute;right:24px;top:50%;width:10px;height:10px;
  border-right:2px solid var(--acc2);border-bottom:2px solid var(--acc2);
  transform:translateY(-70%) rotate(45deg);transition:transform .25s ease}
.faq details[open] summary::after{transform:translateY(-30%) rotate(225deg)}
.faq details p{padding:0 24px 22px;color:var(--mut);font-size:.96875rem;max-width:68ch}

/* ---------- contact ---------- */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:28px;margin-top:4px}
.c-card{background:var(--card);border:1px solid var(--line);border-radius:var(--rad);
  padding:44px 36px;text-align:center}
.c-card svg{width:40px;height:40px;stroke:var(--acc2);fill:none;stroke-width:1.5;margin:0 auto 16px;display:block}
.c-card h3{margin-bottom:10px;font-size:1.25rem}
.c-card p{color:var(--mut);font-size:.875rem;margin-bottom:24px}
.c-card .mail{font-size:1.25rem;color:var(--acc2);font-weight:600;letter-spacing:.5px;word-break:break-all}
.c-card .mail:hover{color:#fff}

/* ---------- footer ---------- */
footer{border-top:1px solid var(--line);padding:48px 0 40px;background:#070c18}
.foot{display:flex;justify-content:space-between;align-items:center;gap:24px;flex-wrap:wrap}
.foot .brand img{width:38px;height:38px}
.foot-links{display:flex;gap:22px;font-size:.875rem}
.foot-links a{color:var(--mut);transition:color .2s}
.foot-links a:hover{color:#fff}
.foot p{color:var(--mut);font-size:.8125rem}

/* ---------- noscript ---------- */
.noscript{background:#3a2a08;border:1px solid var(--gold);color:#ffe9b8;padding:14px 20px;
  text-align:center;font-size:.875rem}

/* ---------- reveal (no-JS safe: hidden ONLY when html.js) ---------- */
html.js .reveal{opacity:0;transform:translateY(28px);
  transition:opacity .7s cubic-bezier(.22,.61,.36,1),transform .7s cubic-bezier(.22,.61,.36,1)}
html.js .reveal.on{opacity:1;transform:none}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  html.js .reveal{opacity:1!important;transform:none!important;transition:none!important}
  *,*::before,*::after{transition-duration:.01ms!important;animation:none!important}
}

/* ---------- responsive ---------- */
@media(max-width:860px){
  section{padding:64px 0}
  .nav-links{display:none;position:absolute;top:72px;left:0;right:0;background:var(--bg2);
    flex-direction:column;align-items:stretch;padding:8px 24px 24px;gap:0;
    border-bottom:1px solid var(--line)}
  .nav-links.open{display:flex}
  .nav-links a.nl{display:block;font-size:17px;padding:14px 0;border-bottom:1px solid var(--line)}
  .nav-links a.nl::after{display:none}
  .nav-links .btn.sm{margin-top:16px;min-height:52px}
  .burger{display:inline-flex}
  .trust-in{grid-template-columns:repeat(2,1fr);row-gap:24px}
  .trust-in div+div{border-left:none}
  .trust-in div:nth-child(even){border-left:1px solid var(--line)}
  .steps{grid-template-columns:1fr 1fr}
  .about-grid,.contact-grid{grid-template-columns:1fr}
  .svc-grid{gap:20px}
}
@media(max-width:520px){
  section{padding:48px 0}
  .steps{grid-template-columns:1fr}
  .hero-ctas .btn{flex:1 1 100%}
  .hero-meta{display:grid;grid-template-columns:1fr 1fr;gap:20px 24px}
  .about-card{padding:28px}
  .c-card{padding:36px 24px}
  .faq summary{padding:18px 20px;padding-right:48px}
  .faq summary::after{right:20px}
  .foot{flex-direction:column;text-align:center;justify-content:center}
  .foot-links{justify-content:center;flex-wrap:wrap}
}