/* Course page v4 (2026-10-17) — matches home v4: navy hero, brand blue, gold only for the offer, clean + responsive. */
body[data-page="course"]{--n0:#011835;--b0:#0050ed;--b2:#7fb0ff;--gold:#f5b942;--ice:#eef4ff;--hb:'Anek Bangla','Hind Siliguri',system-ui,sans-serif}
:root[data-theme="dark"] body[data-page="course"]{--ice:#0d1a38}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) body[data-page="course"]{--ice:#0d1a38}}
body[data-page="course"] #site-header{background:#011835;border-color:rgba(255,255,255,.08)}
body[data-page="course"] .site-header{background:rgba(1,24,53,.94);border-bottom-color:rgba(255,255,255,.08)}
body[data-page="course"] .brand-logo .lg-light{display:none}body[data-page="course"] .brand-logo .lg-dark{display:block}
body[data-page="course"] .nav a{color:#b8c9ec}body[data-page="course"] .nav a:hover,body[data-page="course"] .nav a.active{color:#fff}
body[data-page="course"] .nav a::after{background:#7fb0ff}
body[data-page="course"] .site-header .icon-btn{color:#dbe6ff}body[data-page="course"] .site-header .icon-btn:hover{background:rgba(255,255,255,.1)}
body[data-page="course"] .h-actions .btn-ghost{color:#fff}
body[data-page="course"] .mobile-nav{background:#011835}body[data-page="course"] .mobile-nav a{color:#fff;border-bottom-color:rgba(255,255,255,.08)}
.k-hero h1,.k-box h2,.k-rel h2{font-family:var(--hb);font-weight:700}

/* hero */
.k-hero{position:relative;overflow:hidden;color:#fff;background:radial-gradient(80% 120% at 85% 20%,#0a3a9c,var(--n0) 60%),var(--n0)}
.k-hero-bg{position:absolute;right:0;top:0;width:58%;height:100%;object-fit:cover;opacity:.55;-webkit-mask-image:linear-gradient(90deg,transparent,#000 45%);mask-image:linear-gradient(90deg,transparent,#000 45%)}
.k-hero::after{content:"";position:absolute;inset:0;background:linear-gradient(0deg,rgba(1,24,53,.7),transparent 40%);pointer-events:none}
.k-hero-in{position:relative;z-index:1;padding:44px 24px 120px}
.k-hero-txt{max-width:640px}
.k-crumbs{display:flex;align-items:center;gap:6px;font-size:13.5px;color:#9fb6e0;margin-bottom:16px}
.k-crumbs .i{width:14px;height:14px}.k-crumbs a:hover{color:#fff}
.k-chips{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:14px}
.k-chips span{display:inline-flex;align-items:center;gap:6px;padding:5px 12px;border-radius:99px;background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.16);font-size:13.5px;color:#dbe6ff}
.k-chips span.on{background:rgba(61,220,151,.16);border-color:rgba(61,220,151,.4);color:#bff5dc}
.k-chips span.gold{background:var(--gold);border-color:var(--gold);color:#3a2400;font-weight:600}
.k-chips .i{width:15px;height:15px}
.k-hero h1{color:#fff;font-size:clamp(1.9rem,4vw,3.2rem);line-height:1.2;margin-bottom:12px;animation:kup .7s both}
.k-desc{color:#c3d3f2;font-size:1.05rem;max-width:580px;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;animation:kup .7s .1s both}
.k-stats{display:flex;flex-wrap:wrap;gap:10px 22px;margin-top:20px;font-size:14.5px;color:#c3d3f2;animation:kup .7s .2s both}
.k-stats span{display:inline-flex;align-items:center;gap:6px}.k-stats b{color:#fff}.k-stats .i{width:17px;height:17px;color:var(--b2)}
@keyframes kup{from{opacity:0;transform:translateY(16px)}}

/* layout */
.k-layout{display:grid;grid-template-columns:minmax(0,1fr) 360px;gap:32px;align-items:start;margin-top:-84px;position:relative;z-index:2;padding-bottom:40px}
.k-main{display:flex;flex-direction:column;gap:18px;padding-top:100px}
.k-side{position:sticky;top:84px}
.k-card{border-radius:24px;background:var(--card);border:1px solid var(--line);box-shadow:0 24px 60px -20px rgba(1,24,53,.35);overflow:hidden}
.k-thumb{position:relative;aspect-ratio:16/9;background:linear-gradient(140deg,var(--c1),var(--c2));display:grid;place-items:center;color:#fff}
.k-thumb img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.k-thumb>.i{width:48px;height:48px}
.k-play{position:relative;width:64px;height:64px;border-radius:50%;border:0;background:rgba(255,255,255,.95);color:var(--b0);display:grid;place-items:center;cursor:pointer;box-shadow:0 0 0 0 rgba(255,255,255,.5);animation:kring 2.2s infinite}
.k-play .i{width:26px;height:26px;margin-left:3px}
@keyframes kring{70%{box-shadow:0 0 0 16px rgba(255,255,255,0)}}
.k-pad{padding:20px}
.k-price{display:flex;align-items:center;gap:14px;margin-bottom:14px}
.k-price>span{display:flex;flex-direction:column;font-size:13px;color:var(--mut)}
.k-price em{font-style:normal;align-self:flex-start;font-size:12px;font-weight:700;color:#3a2400;background:var(--gold);border-radius:99px;padding:1px 10px;margin-bottom:2px}
.k-free{font-family:var(--hb);font-size:34px;color:#0f9d6b}
.k-tix{display:flex;flex-direction:column;align-items:center;line-height:1.05;padding:8px 18px;border-radius:14px;background:var(--ice);border:1px dashed color-mix(in srgb,var(--b0) 40%,transparent)}
.k-tix s{font-size:13px;color:var(--faint)}.k-tix b{font-family:var(--hb);font-size:32px;color:var(--b0)}
.k-cta .btn,.k-cta .cx-btn{display:flex;width:100%;justify-content:center;align-items:center;gap:8px;height:50px;border-radius:14px;font-weight:600;font-size:16px}
.k-cta .cx-btn{background:var(--b0);color:#fff;border:0}
.k-cta .cx-btn:hover{background:#0040b8}
.k-cta .btn-ghost{background:var(--ice);border:0;color:var(--ink);margin-top:8px}
.k-cta .tiny{font-size:12.5px;color:var(--mut);margin-top:8px;text-align:center}
.k-cta .cx-prog{margin-top:10px}
.k-inc{list-style:none;display:flex;flex-direction:column;gap:8px;margin:16px 0;padding-top:14px;border-top:1px solid var(--line);font-size:14.5px;color:var(--txt)}
.k-inc li{display:flex;gap:8px;align-items:center}.k-inc .i{width:17px;height:17px;color:var(--b0)}
.k-share{width:100%;display:flex;justify-content:center;gap:6px;align-items:center;border:0;background:none;color:var(--mut);font:inherit;font-size:14px;cursor:pointer}
.k-share:hover{color:var(--b0)}

/* main boxes */
.k-perks{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.k-perk{display:flex;flex-direction:column;gap:2px;padding:16px;border-radius:18px;background:var(--card);border:1px solid var(--line);transition:transform .3s cubic-bezier(.16,1,.3,1),box-shadow .3s}
.k-perk:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.k-perk img{width:52px;height:52px;object-fit:contain;margin-bottom:6px}
.k-perk b{font-family:var(--hb);color:var(--ink);font-size:16px}.k-perk small{color:var(--mut);font-size:13px}
.k-box{padding:22px;border-radius:22px;background:var(--card);border:1px solid var(--line)}
.k-box h2{color:var(--ink);font-size:1.4rem;margin-bottom:14px}
.k-box-h{display:flex;justify-content:space-between;align-items:baseline;gap:10px;flex-wrap:wrap;margin-bottom:12px}.k-box-h h2{margin:0}
.k-sub{font-size:13.5px;color:var(--mut)}
.k-learn{list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:10px 18px}
.k-learn li,.k-for li{display:flex;gap:10px;align-items:flex-start;color:var(--txt);font-size:15px}
.k-learn .i{flex:none;width:20px;height:20px;padding:3px;border-radius:50%;background:var(--ice);color:var(--b0);margin-top:2px}
.k-for{list-style:none;display:flex;flex-direction:column;gap:10px}.k-for .i{flex:none;color:var(--b0);width:18px;height:18px;margin-top:3px}
.k-curr .cx-chap{border-radius:16px}
.k-book{display:flex;align-items:center;gap:14px;padding:14px 18px;border-radius:20px;background:linear-gradient(120deg,var(--n0),var(--b0));color:#fff;transition:transform .3s}
.k-book:hover{transform:translateY(-3px)}
.k-book img{width:48px;height:48px;object-fit:contain}
.k-book span{flex:1;display:flex;flex-direction:column}.k-book b{font-family:var(--hb);font-size:17px}.k-book small{color:#c9dbff}
.k-note{display:flex;gap:8px;align-items:flex-start;font-size:13.5px;color:var(--mut)}.k-note .i{flex:none;width:16px;height:16px;margin-top:3px;color:var(--b0)}

/* related */
.k-rel{padding:10px 24px 60px}
.k-rel h2{color:var(--ink);font-size:1.6rem;margin-bottom:14px}
.k-rel-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.k-rc{position:relative;display:block;aspect-ratio:4/3;border-radius:20px;overflow:hidden;background:linear-gradient(140deg,var(--c1),var(--c2));color:#fff}
.k-rc img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .7s cubic-bezier(.16,1,.3,1)}
.k-rc:hover img{transform:scale(1.07)}
.k-rc-shade{position:absolute;inset:0;background:linear-gradient(180deg,transparent 35%,rgba(1,24,53,.9))}
.k-rc-txt{position:absolute;left:14px;right:14px;bottom:12px;display:flex;flex-direction:column}
.k-rc-txt b{font-family:var(--hb);font-size:16px;line-height:1.3}.k-rc-txt small{color:#ffe08a;font-weight:600}

@media (max-width:980px){
  .k-layout{grid-template-columns:1fr;margin-top:-70px}
  .k-side{position:static;order:-1}
  .k-main{padding-top:0}
  .k-hero-in{padding:32px 16px 96px}
  .k-hero-bg{width:100%;opacity:.25;-webkit-mask-image:none;mask-image:none}
  .k-rel-grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:600px){
  .wrap.k-layout,.k-rel{padding-left:16px;padding-right:16px}
  .k-perks{grid-template-columns:repeat(2,1fr)}
  .k-learn{grid-template-columns:1fr}
  .k-box{padding:18px}
  .k-stats{gap:8px 16px;font-size:13.5px}
}
@media (prefers-reduced-motion:reduce){.k-hero h1,.k-desc,.k-stats,.k-play{animation:none}}