/* ============================================================
   Depend Tech BD — main stylesheet
   Change brand colours in the :root block below.
   ============================================================ */
:root{
  --brand:#ff1f2d;            /* logo red */
  --brand-2:#22d3ee;          /* logo cyan */
  --brand-3:#c026d3;          /* logo magenta */
  --radius:18px;
  --max:1140px;
  --font-bn:"Hind Siliguri",system-ui,sans-serif;
  --font-en:"Space Grotesk","Hind Siliguri",sans-serif;
}
html[data-theme="dark"]{
  --bg:#07080f; --surface:#10121d; --surface-2:#161a29;
  --text:#f3f5ff; --muted:#a3aac4; --line:rgba(255,255,255,.10);
}
html[data-theme="light"]{
  --bg:#f6f7fb; --surface:#ffffff; --surface-2:#eef1f8;
  --text:#0d1020; --muted:#5a6076; --line:rgba(10,15,40,.10);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--text);font-family:var(--font-bn);line-height:1.75;overflow-x:hidden;transition:background .35s,color .35s}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}
.container{width:min(var(--max),92%);margin-inline:auto}
.narrow{width:min(820px,92%)}
h1,h2,h3{font-family:var(--font-en);line-height:1.25;letter-spacing:-.02em}
h1{font-size:clamp(2rem,5.2vw,3.6rem);font-weight:700}
h2{font-size:clamp(1.6rem,3.4vw,2.4rem);margin-bottom:.6rem}
h3{font-size:1.12rem;margin-bottom:.35rem}
p{color:var(--muted)}
.skip{position:absolute;left:-999px}
.skip:focus{left:1rem;top:1rem;background:var(--brand);color:#fff;padding:.5rem 1rem;border-radius:8px;z-index:99}

/* nav */
.nav{position:sticky;top:0;z-index:50;backdrop-filter:blur(14px);background:color-mix(in oklab,var(--bg) 82%,transparent);border-bottom:1px solid var(--line)}
.nav.scrolled{box-shadow:0 10px 30px -18px rgba(0,0,0,.7)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:.7rem 0}
.brand{display:flex;align-items:center;gap:.6rem;font-family:var(--font-en);font-weight:700;font-size:1.05rem}
.brand img{border-radius:50%}
.brand b{color:var(--brand)}
.links{display:flex;gap:1.35rem;font-size:.95rem}
.links a{position:relative;color:var(--muted);transition:color .2s}
.links a::after{content:"";position:absolute;left:0;bottom:-6px;height:2px;width:100%;background:linear-gradient(90deg,var(--brand),var(--brand-2));transform:scaleX(0);transform-origin:right;transition:transform .3s}
.links a:hover{color:var(--text)}
.links a:hover::after{transform:scaleX(1);transform-origin:left}
.tools{display:flex;gap:.5rem}
.pill{background:var(--surface-2);border:1px solid var(--line);color:var(--text);border-radius:999px;padding:.42rem .8rem;font-size:.85rem;cursor:pointer;font-family:var(--font-en);transition:transform .2s,border-color .2s}
.pill:hover{transform:translateY(-2px);border-color:var(--brand)}
.burger{display:none}

/* hero */
.hero{position:relative;padding:clamp(3rem,8vw,6rem) 0 clamp(3rem,7vw,5rem);overflow:hidden}
.glow{position:absolute;inset:auto;top:-25%;left:50%;width:900px;height:900px;transform:translateX(-50%);background:radial-gradient(circle at 30% 40%,color-mix(in oklab,var(--brand) 32%,transparent),transparent 60%),radial-gradient(circle at 70% 60%,color-mix(in oklab,var(--brand-2) 28%,transparent),transparent 60%);filter:blur(60px);opacity:.55;animation:drift 14s ease-in-out infinite alternate;pointer-events:none}
@keyframes drift{to{transform:translate(-46%,4%) scale(1.1)}}
.hero-grid{position:relative;display:grid;grid-template-columns:1.15fr .85fr;gap:3rem;align-items:center}
.tag{display:inline-block;font-size:.8rem;padding:.35rem .85rem;border-radius:999px;border:1px solid var(--line);background:var(--surface);color:var(--muted);margin-bottom:1rem}
.hero-copy p{margin:1rem 0 1.6rem;font-size:1.03rem;max-width:56ch}
.cta{display:flex;gap:.8rem;flex-wrap:wrap}
.btn{display:inline-block;padding:.8rem 1.5rem;border-radius:999px;font-family:var(--font-en);font-weight:600;font-size:.95rem;border:1px solid transparent;cursor:pointer;transition:transform .2s,box-shadow .25s,background .25s}
.btn.primary{background:linear-gradient(115deg,var(--brand),var(--brand-3));color:#fff;box-shadow:0 14px 34px -16px var(--brand)}
.btn.ghost{border-color:var(--line);background:var(--surface);color:var(--text)}
.btn:hover{transform:translateY(-3px)}
.stats{display:flex;gap:2rem;margin-top:2.2rem;flex-wrap:wrap}
.stats b{display:block;font-family:var(--font-en);font-size:1.6rem;background:linear-gradient(90deg,var(--brand),var(--brand-2));-webkit-background-clip:text;background-clip:text;color:transparent}
.stats span{font-size:.85rem;color:var(--muted)}
.hero-art{position:relative;display:grid;place-items:center}
.hero-art img{width:min(320px,80%);border-radius:50%;animation:float 6s ease-in-out infinite;filter:drop-shadow(0 24px 50px rgba(0,0,0,.45))}
.orb{position:absolute;width:min(360px,88%);aspect-ratio:1;border-radius:50%;border:1px dashed var(--line);animation:spin 26s linear infinite}
@keyframes float{50%{transform:translateY(-16px)}}
@keyframes spin{to{transform:rotate(360deg)}}

/* sections */
.section{padding:clamp(3rem,7vw,5.5rem) 0}
.section.alt{background:var(--surface)}
.lead{max-width:60ch;margin-bottom:2rem}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(270px,1fr));gap:1.2rem}
.grid.two-col{grid-template-columns:repeat(auto-fit,minmax(300px,1fr))}
.card{background:var(--surface-2);border:1px solid var(--line);border-radius:var(--radius);padding:1.5rem;transition:transform .3s,border-color .3s,box-shadow .3s}
.section.alt .card{background:var(--bg)}
.card:hover{transform:translateY(-6px);border-color:color-mix(in oklab,var(--brand) 45%,transparent);box-shadow:0 22px 44px -28px var(--brand)}
.ico{font-size:1.7rem;margin-bottom:.6rem}
.two{display:grid;grid-template-columns:1fr 1fr;gap:2.4rem;align-items:center}
.ticks{list-style:none;margin-top:1.1rem;display:grid;gap:.5rem}
.ticks li{color:var(--muted);padding-left:1.6rem;position:relative}
.ticks li::before{content:"✓";position:absolute;left:0;color:var(--brand-2);font-weight:700}
.panel{background:var(--surface-2);border:1px solid var(--line);border-radius:var(--radius);padding:1.6rem}
.section.alt .panel{background:var(--bg)}
.bar{margin-top:1rem;font-size:.9rem;color:var(--muted)}
.bar i{display:block;height:8px;border-radius:99px;background:var(--line);margin-top:.4rem;position:relative;overflow:hidden}
.bar i::after{content:"";position:absolute;inset:0;width:var(--v);background:linear-gradient(90deg,var(--brand),var(--brand-2));border-radius:99px;transform-origin:left;animation:grow 1.2s ease forwards}
@keyframes grow{from{transform:scaleX(0)}}
.social{display:block;border-radius:var(--radius);padding:1.7rem;border:1px solid var(--line);background:var(--surface-2);transition:transform .3s,box-shadow .3s}
.social span{font-family:var(--font-en);font-size:.9rem;color:var(--brand-2)}
.social.fb{background:linear-gradient(140deg,color-mix(in oklab,#1877f2 20%,var(--surface-2)),var(--surface-2))}
.social.yt{background:linear-gradient(140deg,color-mix(in oklab,#ff0000 20%,var(--surface-2)),var(--surface-2))}
.social:hover{transform:translateY(-6px);box-shadow:0 24px 44px -30px #000}
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:1.2rem;margin-top:1.6rem}
.step{background:var(--bg);border:1px solid var(--line);border-radius:var(--radius);padding:1.4rem}
.step b{font-family:var(--font-en);font-size:1.9rem;color:color-mix(in oklab,var(--brand) 70%,var(--text));display:block;margin-bottom:.3rem}
details{background:var(--surface-2);border:1px solid var(--line);border-radius:14px;padding:1rem 1.2rem;margin-bottom:.8rem}
summary{cursor:pointer;font-weight:600;font-family:var(--font-en)}
details p{margin-top:.6rem}
.contacts{display:grid;gap:.7rem;margin-top:1.2rem}
.contacts a{background:var(--bg);border:1px solid var(--line);border-radius:12px;padding:.8rem 1rem;transition:transform .2s,border-color .2s}
.contacts a:hover{transform:translateX(6px);border-color:var(--brand)}
form label{display:block;font-size:.85rem;margin:.8rem 0 .3rem;color:var(--muted)}
form input,form textarea{width:100%;background:var(--bg);border:1px solid var(--line);border-radius:12px;padding:.75rem .9rem;color:var(--text);font-family:inherit}
form input:focus,form textarea:focus{outline:2px solid color-mix(in oklab,var(--brand) 60%,transparent)}
form .btn{margin-top:1.1rem;width:100%}

/* footer */
.footer{border-top:1px solid var(--line);padding:2.5rem 0 1.4rem;background:var(--surface)}
.foot{display:flex;justify-content:space-between;gap:2rem;flex-wrap:wrap}
.foot img{border-radius:50%;margin-bottom:.6rem}
.fl{display:flex;gap:1.2rem;flex-wrap:wrap;align-items:flex-start;color:var(--muted)}
.fl a:hover{color:var(--brand)}
.copy{text-align:center;color:var(--muted);font-size:.85rem;margin-top:1.8rem}
.float{position:fixed;right:18px;bottom:18px;width:52px;height:52px;border-radius:50%;display:grid;place-items:center;background:#25d366;font-size:1.4rem;box-shadow:0 12px 26px -10px rgba(0,0,0,.6);z-index:60;animation:float 3.4s ease-in-out infinite}

/* reveal animation */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}.reveal{opacity:1;transform:none}}

/* responsive */
@media (max-width:900px){
  .hero-grid,.two{grid-template-columns:1fr}
  .hero-art{order:-1}
  .burger{display:block}
  .links{position:absolute;top:100%;left:0;right:0;flex-direction:column;gap:0;background:var(--surface);border-bottom:1px solid var(--line);max-height:0;overflow:hidden;transition:max-height .35s ease}
  .links.open{max-height:340px}
  .links a{padding:.85rem 6%;border-top:1px solid var(--line)}
}