/* Coridor — Complete Mobile-First Stylesheet */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --ink:#111827;--ink2:#374151;--ink3:#6B7280;
  --bg:#fff;--bg2:#F9FAFB;--bg3:#F3F4F6;
  --border:#E5E7EB;
  --accent:#E63946;--accent2:#c1121f;
  --navy:#1A1A2E;--navy2:#16213E;
  --gold:#F59E0B;--green:#10B981;
  --wa:#25D366;--wa2:#1DA851;
  --r:12px;--r2:20px;
  --sh:0 1px 3px rgba(0,0,0,.08),0 1px 2px rgba(0,0,0,.04);
  --sh2:0 4px 16px rgba(0,0,0,.1);
  --sh3:0 12px 40px rgba(0,0,0,.15);
  --font:'Hind Siliguri',sans-serif;
  --disp:'Playfair Display',serif;
  --max:1120px;
}
html{scroll-behavior:smooth}
body{font-family:var(--font);color:var(--ink);background:var(--bg);line-height:1.7;-webkit-font-smoothing:antialiased}
body.no-scroll{overflow:hidden}
img{display:block;max-width:100%}
a{text-decoration:none;color:inherit}
.container{max-width:var(--max);margin:0 auto;padding:0 20px}

/* ===== NAVBAR ===== */
.navbar{position:sticky;top:0;z-index:100;background:rgba(26,26,46,.97);backdrop-filter:blur(12px);border-bottom:1px solid rgba(255,255,255,.07);transition:box-shadow .2s}
.navbar.scrolled{box-shadow:0 4px 24px rgba(0,0,0,.3)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;gap:12px;max-width:var(--max);margin:0 auto;padding:13px 20px}
.nav-brand{font-family:var(--disp);font-size:1.45rem;font-weight:700;color:#fff;flex-shrink:0;white-space:nowrap}
.nav-links{display:flex;gap:22px}
.nav-links a{font-size:.875rem;color:rgba(255,255,255,.6);transition:color .15s;white-space:nowrap}
.nav-links a:hover{color:#fff}

/* ===== BUTTONS ===== */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 26px;border-radius:100px;border:none;cursor:pointer;font-family:var(--font);font-size:.975rem;font-weight:600;text-decoration:none;white-space:nowrap;transition:all .18s;-webkit-tap-highlight-color:transparent}
.btn:active{transform:scale(.96)}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:var(--accent2);transform:translateY(-2px);box-shadow:0 8px 24px rgba(230,57,70,.35)}
.btn-sm{padding:9px 20px;font-size:.875rem}
.btn-full{width:100%}
.btn-wa{background:var(--wa);color:#fff}
.btn-wa:hover{background:var(--wa2)}

/* ===== HERO ===== */
.hero{padding:52px 0 68px;color:#fff;position:relative;overflow:hidden}
.hero-layout{display:grid;grid-template-columns:460px 1fr;gap:56px;align-items:center}

/* ===== GALLERY ===== */
.product-gallery{display:flex;flex-direction:column;gap:10px;width:460px;flex-shrink:0}
.gallery-main{position:relative;width:460px;height:460px;background:rgba(255,255,255,.07);border-radius:var(--r2);overflow:hidden;cursor:zoom-in;flex-shrink:0}
.gallery-slide{position:absolute;inset:0;display:none;align-items:center;justify-content:center}
.gallery-slide.active{display:flex;animation:gFade .25s ease}
@keyframes gFade{from{opacity:0}to{opacity:1}}
.gallery-slide img{max-width:92%;max-height:92%;width:auto;height:auto;object-fit:contain;margin:auto}
.zoom-hint{position:absolute;bottom:10px;right:10px;background:rgba(0,0,0,.5);color:#fff;width:30px;height:30px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:.8rem;opacity:0;transition:opacity .2s;pointer-events:none}
.gallery-slide:hover .zoom-hint{opacity:1}
.g-prev,.g-next{position:absolute;top:50%;transform:translateY(-50%);width:36px;height:36px;border-radius:50%;border:none;background:rgba(255,255,255,.18);color:#fff;font-size:1rem;cursor:pointer;z-index:2;display:flex;align-items:center;justify-content:center;transition:background .15s;backdrop-filter:blur(4px)}
.g-prev:hover,.g-next:hover{background:rgba(255,255,255,.35)}
.g-prev{left:8px}.g-next{right:8px}
.g-count{position:absolute;top:10px;right:10px;background:rgba(0,0,0,.5);color:#fff;font-size:.72rem;padding:2px 8px;border-radius:100px}
.gallery-thumbs{display:flex;gap:8px;overflow-x:auto;width:460px;padding-bottom:2px;scrollbar-width:thin;scrollbar-color:rgba(255,255,255,.2) transparent}
.gallery-thumbs::-webkit-scrollbar{height:3px}
.gallery-thumbs::-webkit-scrollbar-thumb{background:rgba(255,255,255,.2);border-radius:2px}
.g-thumb{flex-shrink:0;width:62px;height:62px;border-radius:8px;border:2px solid rgba(255,255,255,.15);background:rgba(255,255,255,.06);cursor:pointer;padding:0;overflow:hidden;transition:border-color .15s}
.g-thumb img{width:100%;height:100%;object-fit:contain;padding:3px}
.g-thumb.active{border-color:var(--gold);box-shadow:0 0 0 2px rgba(245,158,11,.4)}
.gallery-placeholder{width:460px;height:460px;display:flex;align-items:center;justify-content:center;font-size:6rem;background:rgba(255,255,255,.05);border-radius:var(--r2)}

/* ===== PRODUCT INFO ===== */
.product-info{display:flex;flex-direction:column;gap:15px;padding-top:4px}
.product-tagline{font-size:.8rem;font-weight:600;letter-spacing:.05em;text-transform:uppercase;color:rgba(255,255,255,.5);line-height:1.5}
.product-name{font-family:var(--disp);font-size:clamp(2rem,4vw,3.2rem);line-height:1.12;color:#fff;font-weight:900}
.product-headline{font-size:1rem;color:rgba(255,255,255,.72);line-height:1.7}
.price-row{display:flex;align-items:baseline;gap:10px;flex-wrap:wrap}
.price-main{font-size:2.2rem;font-weight:800;color:var(--gold);letter-spacing:-.02em}
.price-struck{font-size:1rem;text-decoration:line-through;color:rgba(255,255,255,.35)}
.price-badge{background:#fff8e1;color:#92400e;font-size:.75rem;font-weight:700;padding:3px 10px;border-radius:100px}
.spec-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}
.spec-item{background:rgba(255,255,255,.08);border-radius:10px;padding:10px 6px;text-align:center;border:1px solid rgba(255,255,255,.1)}
.spec-icon{font-size:1.25rem;display:block;margin-bottom:3px}
.spec-val{font-size:.8rem;font-weight:700;color:#fff;display:block;line-height:1.2}
.spec-label{font-size:.67rem;color:rgba(255,255,255,.4);display:block;margin-top:2px}
.rating-row{display:flex;align-items:center;gap:8px;font-size:.85rem;color:rgba(255,255,255,.5)}
.stars-inline{color:var(--gold);font-size:1rem;letter-spacing:2px}
.pay-tabs{display:flex;gap:8px;flex-wrap:wrap}
.pay-tab{flex:1;padding:8px 10px;border-radius:var(--r);border:1.5px solid rgba(255,255,255,.2);background:rgba(255,255,255,.08);font-family:var(--font);font-size:.82rem;font-weight:600;cursor:pointer;color:rgba(255,255,255,.7);transition:all .15s;text-align:center;min-width:120px}
.pay-tab.active{border-color:var(--accent);background:var(--accent);color:#fff}
.btn-order-main{display:block;width:100%;padding:15px;background:var(--accent);color:#fff;border:none;border-radius:100px;font-family:var(--font);font-size:1.05rem;font-weight:700;cursor:pointer;text-align:center;transition:all .18s;-webkit-tap-highlight-color:transparent}
.btn-order-main:hover{background:var(--accent2);transform:translateY(-2px);box-shadow:0 8px 28px rgba(230,57,70,.35)}
.btn-order-main:active{transform:scale(.97)}
.btn-secondary-link{display:block;text-align:center;color:rgba(255,255,255,.55);font-size:.9rem;transition:color .15s}
.btn-secondary-link:hover{color:#fff}

/* ===== LIGHTBOX ===== */
.lightbox{position:fixed;inset:0;z-index:900;background:rgba(0,0,0,.96);display:flex;align-items:center;justify-content:center;opacity:0;pointer-events:none;transition:opacity .25s}
.lightbox.active{opacity:1;pointer-events:all}
.lb-inner{position:relative;width:100%;height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:56px 70px 80px;gap:16px}
.lb-imgs{display:flex;align-items:center;justify-content:center;flex:1;width:100%;overflow:hidden}
.lb-img{display:none;max-width:100%;max-height:calc(100vh-180px);width:auto;height:auto;object-fit:contain}
.lb-img.active{display:block;animation:gFade .2s ease}
.lb-prev,.lb-next{position:fixed;top:50%;transform:translateY(-50%);width:46px;height:46px;border-radius:50%;border:2px solid rgba(255,255,255,.2);background:rgba(255,255,255,.08);color:#fff;font-size:1.1rem;cursor:pointer;z-index:10;display:flex;align-items:center;justify-content:center;transition:background .15s}
.lb-prev:hover,.lb-next:hover{background:rgba(255,255,255,.2)}
.lb-prev{left:10px}.lb-next{right:10px}
.lb-close{position:fixed;top:14px;right:14px;z-index:10;width:38px;height:38px;border-radius:50%;border:2px solid rgba(255,255,255,.2);background:rgba(255,255,255,.08);color:#fff;font-size:.9rem;cursor:pointer;display:flex;align-items:center;justify-content:center}
.lb-dots{display:flex;gap:8px}
.lb-dot{width:8px;height:8px;border-radius:50%;border:none;background:rgba(255,255,255,.3);cursor:pointer;padding:0;transition:background .2s,transform .2s}
.lb-dot.active{background:#fff;transform:scale(1.3)}

/* ===== ORDER MODAL ===== */
.modal-overlay{position:fixed;inset:0;z-index:500;background:rgba(17,24,39,.65);backdrop-filter:blur(5px);display:flex;align-items:flex-end;justify-content:center;opacity:0;pointer-events:none;transition:opacity .25s}
.modal-overlay.active{opacity:1;pointer-events:all}
@media(min-width:600px){.modal-overlay{align-items:center}}
.modal-box{background:#fff;border-radius:var(--r2) var(--r2) 0 0;padding:20px 20px 28px;width:100%;max-width:480px;max-height:94vh;overflow-y:auto;position:relative;transform:translateY(40px);transition:transform .3s cubic-bezier(.4,0,.2,1)}
@media(min-width:600px){.modal-box{border-radius:var(--r2);transform:scale(.96);max-height:90vh;padding:28px 26px 32px}}
.modal-overlay.active .modal-box{transform:translateY(0)}
@media(min-width:600px){.modal-overlay.active .modal-box{transform:scale(1)}}
.modal-drag{display:block;width:40px;height:4px;background:var(--border);border-radius:4px;margin:0 auto 18px}
@media(min-width:600px){.modal-drag{display:none}}
.modal-close{position:absolute;top:14px;right:14px;background:var(--bg3);border:none;width:30px;height:30px;border-radius:50%;cursor:pointer;font-size:.95rem;color:var(--ink3);display:flex;align-items:center;justify-content:center}
.modal-title{font-family:var(--disp);font-size:1.45rem;margin-bottom:3px}
.modal-subtitle{color:var(--ink3);font-size:.85rem;margin-bottom:18px}
.form-group{margin-bottom:14px}
.form-group label{display:block;font-weight:600;font-size:.875rem;margin-bottom:5px}
.form-group input,.form-group textarea{width:100%;padding:11px 14px;border:1.5px solid var(--border);border-radius:var(--r);font-family:var(--font);font-size:.975rem;background:var(--bg2);transition:border-color .15s;outline:none;-webkit-appearance:none}
.form-group input:focus,.form-group textarea:focus{border-color:var(--accent);background:#fff}
.form-group textarea{resize:vertical;min-height:76px}
.phone-input-wrap{display:flex}
.phone-prefix{padding:11px 12px;background:var(--bg3);border:1.5px solid var(--border);border-right:none;border-radius:var(--r) 0 0 var(--r);font-weight:600;font-size:.9rem;color:var(--ink2);flex-shrink:0}
.phone-input-wrap input{border-radius:0 var(--r) var(--r) 0}
.qty-group{display:flex;align-items:center;justify-content:space-between}
.qty-control{display:flex;align-items:center;gap:14px}
.qty-btn{width:36px;height:36px;border-radius:50%;border:2px solid var(--border);background:var(--bg2);font-size:1.2rem;cursor:pointer;font-weight:700;display:flex;align-items:center;justify-content:center;transition:border-color .15s;-webkit-tap-highlight-color:transparent}
.qty-btn:hover{border-color:var(--accent);color:var(--accent)}
#f_qty{font-size:1.1rem;font-weight:700;min-width:22px;text-align:center}
.order-summary{display:flex;justify-content:space-between;align-items:center;padding:13px 16px;background:var(--bg2);border-radius:var(--r);margin:14px 0;font-weight:600}
#totalDisplay{font-size:1.3rem;color:var(--accent)}
.form-error{color:#dc2626;font-size:.875rem;padding:10px 14px;background:#fef2f2;border-radius:var(--r);margin-bottom:12px}
.order-success{text-align:center;padding:20px 0}
.success-icon{font-size:3rem;margin-bottom:14px}
.order-success h3{font-family:var(--disp);font-size:1.45rem;margin-bottom:6px}
.bkash-instr{background:#fff0f6;border:1.5px solid rgba(226,19,110,.2);border-radius:var(--r);padding:14px;margin-bottom:12px}
.bkash-logo-row{font-weight:700;font-size:.875rem;margin-bottom:8px}
.bkash-number{font-size:1.3rem;font-weight:800;color:#E2136E;text-align:center;background:#fff;border-radius:8px;padding:10px;margin-top:8px;letter-spacing:.04em}

/* ===== ABOUT ===== */
.about-section{padding:80px 0;background:var(--bg)}
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:start}
.about-text{display:flex;flex-direction:column;gap:14px}
.about-text p{color:var(--ink2);line-height:1.85;font-size:.975rem}
.desc-card{background:var(--bg2);border-radius:var(--r2);padding:28px;line-height:1.9;color:var(--ink2)}
.desc-card ul{padding-left:20px;margin-top:10px}
.desc-card li{margin-bottom:6px}

/* ===== FEATURES ===== */
.features-section{padding:80px 0;background:var(--bg2)}
.features-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(185px,1fr));gap:18px}
.feature-card{background:var(--bg);border-radius:var(--r2);padding:26px 20px;text-align:center;box-shadow:var(--sh);transition:transform .2s,box-shadow .2s;border:1px solid var(--border)}
.feature-card:hover{transform:translateY(-4px);box-shadow:var(--sh2)}
.feature-icon{font-size:2.2rem;margin-bottom:12px;display:block}
.feature-card h3{font-size:.95rem;font-weight:700;margin-bottom:6px}
.feature-card p{font-size:.85rem;color:var(--ink3);line-height:1.6;margin:0}

/* ===== STEPS ===== */
.steps-section{padding:80px 0}
.steps-sub{text-align:center;color:var(--ink3);margin-bottom:36px;font-size:1rem}
.steps-list{display:flex;flex-direction:column;gap:0;max-width:720px;margin:0 auto}
.step-item{display:flex;gap:22px;align-items:flex-start;padding:26px 0;border-bottom:1px solid var(--border)}
.step-item:last-child{border-bottom:none}
.step-num{width:48px;height:48px;border-radius:50%;background:var(--accent);color:#fff;font-size:1.1rem;font-weight:800;display:flex;align-items:center;justify-content:center;flex-shrink:0;font-family:var(--disp)}
.step-body h3{font-size:1rem;font-weight:700;margin-bottom:5px;padding-top:10px}
.step-body p{color:var(--ink2);font-size:.9rem;line-height:1.65;margin:0}

/* ===== VIDEO ===== */
.video-section{padding:80px 0;background:var(--navy)}
.video-section .section-title{color:#fff}
.video-wrap{position:relative;width:100%;max-width:800px;margin:32px auto 0;padding-bottom:56.25%;height:0;overflow:hidden;border-radius:var(--r2);box-shadow:0 32px 80px rgba(0,0,0,.5)}
.video-wrap iframe{position:absolute;inset:0;width:100%;height:100%;border:none}

/* ===== BOX + SPECS ===== */
.box-specs-section{padding:80px 0;background:var(--bg2)}
.box-specs-grid{display:grid;grid-template-columns:1fr 1fr;gap:32px;align-items:start}
.box-card,.specs-card{background:var(--bg);border-radius:var(--r2);padding:30px;box-shadow:var(--sh);border:1px solid var(--border)}
.card-heading{font-family:var(--disp);font-size:1.15rem;font-weight:700;margin-bottom:18px;color:var(--ink)}
.box-list{list-style:none;display:flex;flex-direction:column;gap:0}
.box-list li{display:flex;align-items:flex-start;gap:10px;font-size:.925rem;padding:11px 0;border-bottom:1px solid var(--border);line-height:1.5}
.box-list li:last-child{border-bottom:none}
.box-list li::before{content:'✓';color:var(--green);font-weight:700;flex-shrink:0;margin-top:2px}
.box-note{font-size:.8rem;color:var(--ink3);margin-top:14px;padding-top:12px;border-top:1px solid var(--border);line-height:1.6}
.specs-table{width:100%;border-collapse:collapse}
.specs-table tr{border-bottom:1px solid var(--border)}
.specs-table tr:last-child{border-bottom:none}
.spec-key{padding:11px 0;color:var(--ink3);font-size:.875rem;width:42%;vertical-align:top}
.spec-value{padding:11px 0;font-weight:600;font-size:.925rem}

/* ===== REVIEWS ===== */
.reviews-section{padding:80px 0}
.reviews-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:18px}
.review-card{background:var(--bg2);border-radius:var(--r2);padding:24px;border:1px solid var(--border)}
.review-header{display:flex;align-items:center;gap:12px;margin-bottom:12px}
.review-av{width:44px;height:44px;border-radius:50%;background:linear-gradient(135deg,var(--accent),var(--gold));color:#fff;font-weight:700;font-size:.95rem;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.review-name{font-weight:700;font-size:.9rem;margin-bottom:2px}
.review-text{font-size:.9rem;color:var(--ink2);line-height:1.7;font-style:italic;margin:0}

/* ===== CTA ===== */
.cta-section{padding:80px 0;background:var(--navy);color:#fff;text-align:center}
.cta-inner{display:flex;flex-direction:column;align-items:center;gap:14px}
.cta-inner h2{font-family:var(--disp);font-size:clamp(1.8rem,4vw,2.5rem);color:#fff}
.cta-inner p{color:rgba(255,255,255,.6);max-width:460px;font-size:.975rem}
.cta-inner .btn-order-main{max-width:300px;margin:0 auto}

/* ===== SECTION TITLE ===== */
.section-title{font-family:var(--disp);font-size:clamp(1.6rem,3.5vw,2.1rem);color:var(--ink);margin-bottom:36px;text-align:center;font-weight:800;line-height:1.2}
.section-title.left{text-align:left}

/* ===== FOOTER ===== */
.footer{background:#111827;color:rgba(255,255,255,.4);text-align:center;padding:36px 20px;font-size:.875rem}
.footer-tagline{font-family:var(--disp);font-size:1.1rem;color:rgba(255,255,255,.7);margin-bottom:8px}

/* ===== STICKY BAR ===== */
.sticky-bar{position:fixed;bottom:0;left:0;right:0;z-index:200;background:#fff;border-top:1px solid var(--border);padding:11px 18px;display:flex;align-items:center;justify-content:space-between;gap:14px;box-shadow:0 -4px 24px rgba(0,0,0,.1);transform:translateY(100%);transition:transform .3s cubic-bezier(.4,0,.2,1)}
.sticky-bar.visible{transform:translateY(0)}
.sticky-price{font-size:1.2rem;font-weight:800;color:var(--accent);display:flex;align-items:baseline;gap:7px}
.sticky-old{font-size:.8rem;font-weight:400;text-decoration:line-through;color:var(--ink3)}
.sticky-btn{flex-shrink:0}

/* ===== RESPONSIVE ===== */
@media(max-width:960px){
  .hero-layout{grid-template-columns:360px 1fr;gap:36px}
  .product-gallery{width:360px}
  .gallery-main{width:360px;height:360px}
  .gallery-thumbs{width:360px}
  .gallery-placeholder{width:360px;height:360px}
}
@media(max-width:760px){
  .hero{padding:36px 0 52px}
  /* Stack: text first on mobile, gallery below */
  .hero-layout{grid-template-columns:1fr;gap:28px}
  .product-info{order:1}
  .product-gallery{order:2;width:100%;align-items:center}
  .gallery-main{width:min(88vw,340px);height:min(88vw,340px)}
  .gallery-thumbs{width:min(88vw,340px)}
  .gallery-placeholder{width:min(88vw,340px);height:min(88vw,340px)}
  .about-grid{grid-template-columns:1fr}
  .box-specs-grid{grid-template-columns:1fr}
  .nav-links{display:none}
  .spec-grid{grid-template-columns:repeat(2,1fr)}
  .features-grid{grid-template-columns:repeat(2,1fr)}
  .lb-prev{left:4px}.lb-next{right:4px}
  .lb-inner{padding:50px 8px 70px}
}
@media(max-width:480px){
  .container{padding:0 14px}
  .product-name{font-size:1.85rem}
  .pay-tabs{flex-direction:column}
  .pay-tab{min-width:unset}
  .sticky-btn .btn{padding:9px 18px;font-size:.875rem}
}