/* =========================================================
   Kalyan Engineers - stylesheet
   ========================================================= */
:root{
  --bg:#0b0f14; --bg2:#10161d; --panel:#141b23; --line:#243040;
  --text:#e8edf2; --muted:#92a0b0; --accent:#ff8a2a; --accent2:#4fc3ff;
  --radius:14px; --shadow:0 10px 30px rgba(0,0,0,.35);
  --head:'Barlow Condensed','Arial Narrow',sans-serif; --body:'Inter',system-ui,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font:16px/1.65 var(--body);-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:var(--accent2);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3,h4{font-family:var(--head);line-height:1.1;margin:0 0 .5em;letter-spacing:.01em}
h1{font-size:clamp(2.4rem,6vw,4.6rem);font-weight:700}
h2{font-size:clamp(1.9rem,4vw,2.9rem);font-weight:700}
h3{font-size:1.4rem;font-weight:600}
h4{font-size:1.15rem;font-weight:600;color:#fff}
p{margin:0 0 1em}
.wrap{width:min(1180px,92%);margin-inline:auto}
.center{text-align:center}
.muted{color:var(--muted)}
.small{font-size:.85rem}
.accent{color:var(--accent)}
.eyebrow{font:600 .85rem/1 var(--body);text-transform:uppercase;letter-spacing:.18em;color:var(--accent);margin-bottom:1rem}
.eyebrow a{color:inherit}
.lead{font-size:1.15rem;color:#c5cfd9;max-width:56ch}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;background:var(--accent);color:#1a0f05;border:0;border-radius:999px;padding:.85rem 1.6rem;font:600 .95rem var(--body);cursor:pointer;transition:transform .15s,box-shadow .2s,background .2s;text-decoration:none}
.btn:hover{transform:translateY(-2px);box-shadow:0 8px 22px rgba(255,138,42,.35);text-decoration:none}
.btn-sm{padding:.5rem 1rem;font-size:.85rem}
.btn-ghost{background:transparent;color:var(--text);border:1px solid var(--line)}
.btn-ghost:hover{border-color:var(--accent);box-shadow:none;color:#fff}
.btn-danger{background:#e5484d;color:#fff}
.btn-danger:hover{box-shadow:0 6px 18px rgba(229,72,77,.4)}
.cta-row{display:flex;flex-wrap:wrap;gap:.8rem;margin-top:1.4rem}

/* header */
.site-header{position:fixed;inset:0 0 auto 0;z-index:50;display:flex;align-items:center;justify-content:space-between;padding:.9rem 4%;transition:background .25s,box-shadow .25s,backdrop-filter .25s}
.site-header.scrolled,body:not(.home) .site-header{background:rgba(11,15,20,.82);backdrop-filter:blur(12px);box-shadow:0 1px 0 var(--line)}
.brand{display:flex;align-items:center;gap:.6rem;color:#fff;text-decoration:none}
.brand:hover{text-decoration:none}
.brand-mark{color:var(--accent);display:grid;place-items:center}
.brand-text{font:600 1.45rem var(--head);letter-spacing:.03em}
.brand-text b{color:var(--accent);font-weight:700}
.main-nav{display:flex;align-items:center;gap:1.6rem}
.main-nav a{color:#cfd8e1;font-weight:500;font-size:.95rem}
.main-nav a:hover,.main-nav a.on{color:#fff;text-decoration:none}
.main-nav a.on:not(.btn){box-shadow:0 2px 0 var(--accent)}
.main-nav .btn{color:#1a0f05}
.nav-toggle{display:none;background:none;border:0;width:42px;height:42px;cursor:pointer;flex-direction:column;justify-content:center;gap:6px;align-items:center}
.nav-toggle span{width:24px;height:2px;background:#fff;display:block;transition:.2s}
main{min-height:60vh}
body:not(.home) main{padding-top:68px}

/* ===== 3D assembly stage ===== */
.assembly{position:relative;height:480vh;background:radial-gradient(1200px 700px at 70% 40%,#16222f 0%,var(--bg) 70%)}
.stage{position:sticky;top:0;height:100vh;height:100svh;overflow:hidden}
#solenoid3d{position:absolute;inset:0;width:100%;height:100%;display:block;cursor:grab}
#solenoid3d:active{cursor:grabbing}
.stage-vignette{position:absolute;inset:0;pointer-events:none;background:linear-gradient(90deg,rgba(11,15,20,.78) 0%,rgba(11,15,20,0) 48%),linear-gradient(0deg,rgba(11,15,20,.65),rgba(11,15,20,0) 28%)}
.stage-copy{position:absolute;left:4%;top:50%;margin-top:-170px;width:min(560px,92%);will-change:transform,opacity}
.stage-copy h1{margin-bottom:.4em;text-shadow:0 2px 30px rgba(0,0,0,.5)}

.steps{list-style:none;margin:0;padding:0;position:absolute;left:4%;bottom:90px;display:grid;gap:.6rem;width:min(380px,86%)}
.steps li{display:grid;grid-template-columns:auto 1fr;column-gap:.9rem;row-gap:0;opacity:.18;transform:translateX(-12px);transition:opacity .4s,transform .4s;padding:.55rem .9rem;border-left:2px solid var(--line);background:linear-gradient(90deg,rgba(11,15,20,.55),transparent)}
.steps li b{grid-row:1 / span 2;font:700 1.6rem var(--head);color:var(--accent);align-self:center}
.steps li span{font-weight:600;color:#fff}
.steps li small{color:var(--muted);line-height:1.35}
.steps li.done{opacity:.5;transform:none;border-color:var(--accent)}
.steps li.active{opacity:1;transform:none;border-color:var(--accent)}

.stage-ui{position:absolute;right:4%;bottom:34px;display:flex;align-items:center;gap:1rem}
.stage-ui .hint{color:var(--muted);font-size:.8rem}
.btn-energise{background:linear-gradient(180deg,#ffb066,var(--accent));transition:opacity .3s,transform .15s,box-shadow .3s}
.btn-energise.on{box-shadow:0 0 0 3px rgba(79,195,255,.4),0 0 30px rgba(79,195,255,.6);background:linear-gradient(180deg,#8fdcff,var(--accent2));color:#04202e}
.btn-energise.locked{opacity:.3;pointer-events:none}
.scroll-cue{position:absolute;left:50%;bottom:22px;transform:translateX(-50%);font:600 .7rem var(--body);letter-spacing:.25em;text-transform:uppercase;color:var(--muted);display:flex;flex-direction:column;align-items:center;gap:.5rem;transition:opacity .3s}
.scroll-cue.hide{opacity:0}
.scroll-cue span{width:1.5px;height:34px;background:linear-gradient(var(--accent),transparent);animation:cue 1.6s infinite}
@keyframes cue{0%{transform:scaleY(0);transform-origin:top}50%{transform:scaleY(1);transform-origin:top}51%{transform-origin:bottom}100%{transform:scaleY(0);transform-origin:bottom}}

/* fallback when WebGL is unavailable */
.assembly.no-webgl{height:auto}
.assembly.no-webgl .stage{position:relative;height:auto;padding:8rem 0 4rem}
.assembly.no-webgl #solenoid3d,.assembly.no-webgl .steps,.assembly.no-webgl .stage-ui,.assembly.no-webgl .scroll-cue{display:none}
.assembly.no-webgl .stage-copy{position:relative;margin:0 auto;left:auto;top:auto}

/* trust strip */
.strip{background:var(--bg2);border-block:1px solid var(--line)}
.strip-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1rem;padding:1.6rem 0}
.strip-grid div{display:flex;flex-direction:column}
.strip-grid b{font:700 1.4rem var(--head);color:#fff}
.strip-grid span{color:var(--muted);font-size:.85rem}

/* sections */
.section{padding:5.5rem 0}
.section.alt{background:var(--bg2);border-block:1px solid var(--line)}
.section-head{max-width:680px;margin-bottom:2.4rem}
.page-hero{padding:3.5rem 0 1rem;background:linear-gradient(180deg,#121a23,var(--bg))}
.page-hero h1{font-size:clamp(2.2rem,5vw,3.6rem);margin:0}
.cta{background:radial-gradient(800px 300px at 50% 0%,rgba(255,138,42,.14),transparent),var(--bg)}
.two-col{display:grid;grid-template-columns:1.2fr .8fr;gap:3rem;align-items:start}

/* product grid */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:1.4rem;margin-bottom:2.4rem}
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column;transition:transform .25s,border-color .25s,box-shadow .25s}
.card:hover{transform:translateY(-6px);border-color:#3a4c63;box-shadow:var(--shadow)}
.card-img{aspect-ratio:4/3;background:radial-gradient(circle at 50% 40%,#1f2a37,#0f151c);display:grid;place-items:center;overflow:hidden}
.card-img img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.card:hover .card-img img{transform:scale(1.06)}
.ph{width:55%;color:#3a4c63}
.card-body{padding:1.1rem 1.2rem 1.3rem;display:flex;flex-direction:column;gap:.5rem;flex:1}
.card-body h3{margin:0;font-size:1.3rem}
.card-body h3 a{color:#fff}
.tag{font-size:.7rem;text-transform:uppercase;letter-spacing:.14em;color:var(--accent)}
.card-foot{margin-top:auto;display:flex;align-items:center;justify-content:space-between;gap:.6rem;padding-top:.6rem}
.price{font:700 1.3rem var(--head);color:#fff}
.price small{font:400 .8rem var(--body);color:var(--muted)}
.price.big{font-size:2.2rem}
.link{font-size:.85rem;font-weight:600}

/* chips */
.chips{display:flex;flex-wrap:wrap;gap:.7rem}
.chip{border:1px solid var(--line);border-radius:999px;padding:.55rem 1.1rem;color:#d4dde6;background:var(--panel);transition:.2s}
.chip:hover{border-color:var(--accent);color:#fff;text-decoration:none;transform:translateY(-2px)}

/* filters */
.filters{display:flex;flex-wrap:wrap;gap:.7rem;margin-bottom:2rem}
.filters input,.filters select{flex:1 1 200px;max-width:320px}
.empty{padding:3rem;text-align:center;color:var(--muted);border:1px dashed var(--line);border-radius:var(--radius)}

/* product detail */
.detail{display:grid;grid-template-columns:1fr 1fr;gap:3rem;align-items:start}
.detail-img{background:radial-gradient(circle at 50% 40%,#1f2a37,#0f151c);border:1px solid var(--line);border-radius:var(--radius);aspect-ratio:4/3;display:grid;place-items:center;overflow:hidden}
.detail-img img{width:100%;height:100%;object-fit:contain}
.desc{color:#c5cfd9;margin-bottom:1.2rem}
.facts{list-style:none;padding:0;margin:0 0 1rem;border-top:1px solid var(--line)}
.facts li{padding:.7rem 0;border-bottom:1px solid var(--line);display:flex;gap:1rem}
.facts b{min-width:130px;color:#fff;font-weight:600}
.facts-card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:1.6rem}
.facts-card dl{display:grid;grid-template-columns:auto 1fr;gap:.6rem 1.2rem;margin:0}
.facts-card dt{color:var(--muted)}
.facts-card dd{margin:0;color:#fff}

/* forms */
.form{display:grid;gap:1rem}
.form label{display:grid;gap:.4rem;font-weight:500;color:#cfd8e1;font-size:.92rem}
.form label small{color:var(--muted);font-weight:400}
input,select,textarea{width:100%;background:#0d131a;border:1px solid var(--line);color:var(--text);border-radius:10px;padding:.75rem .9rem;font:inherit;transition:border-color .2s,box-shadow .2s}
input:focus,select:focus,textarea:focus{outline:0;border-color:var(--accent);box-shadow:0 0 0 3px rgba(255,138,42,.18)}
input[type=file]{padding:.6rem}
.form-row{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem}
.form-wide{max-width:820px}
.form-narrow{max-width:440px}
.hp{position:absolute!important;left:-9999px;opacity:0;height:0;width:0}
.check{display:flex!important;grid-template-columns:none;align-items:center;gap:.5rem}
.check input{width:auto}
.notice{padding:.9rem 1.1rem;border-radius:10px;margin-bottom:1.2rem;border:1px solid}
.notice.ok{background:rgba(48,164,108,.12);border-color:rgba(48,164,108,.5);color:#8be0b3}
.notice.err{background:rgba(229,72,77,.12);border-color:rgba(229,72,77,.5);color:#ff9b9e}

/* footer */
.site-footer{background:#080b0f;border-top:1px solid var(--line);padding:3.5rem 0 1.5rem;margin-top:0}
.foot-grid{display:grid;grid-template-columns:1.3fr .8fr 1.4fr;gap:2.5rem}
.site-footer a{display:block;color:#b6c2ce;margin-bottom:.35rem}
.site-footer p{color:#9aa8b6;font-size:.92rem}
.copy{margin-top:2.5rem;padding-top:1.2rem;border-top:1px solid var(--line);color:var(--muted);font-size:.82rem}

/* reveal */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}

/* ===== admin ===== */
body.admin-login{display:grid;place-items:center;min-height:100vh;background:radial-gradient(900px 500px at 50% 0%,#17222e,var(--bg))}
.login-card{width:min(400px,92%);background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:2rem;box-shadow:var(--shadow)}
.login-card h1{font-size:2rem;margin:0}
body.admin{background:var(--bg)}
.admin-bar{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:1rem;padding:.8rem 4%;background:#080b0f;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
.admin-bar nav{display:flex;flex-wrap:wrap;gap:1.2rem}
.admin-bar nav a{color:#cfd8e1;font-size:.92rem}
.admin-main{padding:2rem 0 4rem}
.row-between{display:flex;align-items:center;justify-content:space-between;gap:1rem;flex-wrap:wrap;margin-bottom:1rem}
.row-between h1{font-size:2.2rem;margin:0}
.stats{display:flex;gap:1rem;margin-bottom:1.6rem;flex-wrap:wrap}
.stats div{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:1rem 1.6rem;min-width:140px}
.stats b{display:block;font:700 2rem var(--head);color:var(--accent)}
.stats span{color:var(--muted);font-size:.85rem}
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius)}
.table{width:100%;border-collapse:collapse;background:var(--panel)}
.table th,.table td{padding:.8rem 1rem;text-align:left;border-bottom:1px solid var(--line);vertical-align:middle}
.table th{font-size:.75rem;text-transform:uppercase;letter-spacing:.1em;color:var(--muted);background:#10171e}
.table tr:last-child td{border-bottom:0}
.table .r{text-align:right}
.table .thumb img{width:64px;height:48px;object-fit:cover;border-radius:8px;border:1px solid var(--line)}
.table .msg{min-width:240px;max-width:420px}
.nowrap{white-space:nowrap}
.actions{display:flex;gap:.5rem;justify-content:flex-end;align-items:center}
.actions form{margin:0}
.current-img{display:flex;align-items:center;gap:1rem}
.current-img img{width:110px;height:82px;object-fit:cover;border-radius:10px;border:1px solid var(--line)}

/* ===== responsive ===== */
@media (max-width:900px){
  .two-col,.detail{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr 1fr}
  .strip-grid{grid-template-columns:repeat(2,1fr)}
  .form-row{grid-template-columns:1fr}
}
@media (max-width:820px){
  .nav-toggle{display:flex}
  .main-nav{position:fixed;inset:64px 0 auto 0;flex-direction:column;align-items:flex-start;gap:0;background:rgba(8,11,15,.97);padding:.5rem 6% 1.2rem;transform:translateY(-130%);transition:transform .3s;border-bottom:1px solid var(--line)}
  .main-nav a{padding:.8rem 0;width:100%;border-bottom:1px solid var(--line)}
  .main-nav .btn{margin-top:.8rem;width:auto;border:0}
  body.nav-open .main-nav{transform:none}
  .stage-copy{top:84px;margin-top:0}
  .stage-copy h1{font-size:2.3rem}
  .stage-copy .lead{font-size:1rem}
  .steps{bottom:80px}
  .stage-ui .hint{display:none}
  .stage-ui{right:50%;transform:translateX(50%);bottom:24px}
  .scroll-cue{display:none}
}
@media (max-width:560px){
  .foot-grid{grid-template-columns:1fr}
  .assembly{height:420vh}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none;transition:none}
  .scroll-cue span{animation:none}
}