/* Support Scholar: design system and components (from the approved prototype) */

/* Layout idea: Khan-style rhythm of wide white bands with a navy header, hero and footer; gold marks the brand word, prices and every buy action */
:root{
  --navy:#1B2A5C; --navy2:#0E1738; --navy3:#2A3B78; --gold:#FFC93C; --goldd:#B86B00;
  --bg:#FFFFFF; --cream:#F5F1E8; --soft:#E9EDF8; --ink:#14214F; --muted:#4F5B7A; --line:#DDE1EE;
  --pale:#C9D0EA; --danger:#B3361F; --ok:#1B7A44;
  --font-body:'Noto Sans Bengali','Lato',system-ui,-apple-system,'Segoe UI',sans-serif;
  --font-head:'Noto Sans Bengali','Lato',system-ui,sans-serif;
  color-scheme:light;
}
html[lang="en"]{--font-body:'Lato','Noto Sans Bengali',system-ui,-apple-system,'Segoe UI',sans-serif;--font-head:'Lato','Noto Sans Bengali',system-ui,sans-serif}
*{box-sizing:border-box}
html,body{margin:0}
body{background:var(--bg);color:var(--ink);font:17px/1.8 var(--font-body)}
h1,h2,h3{font-family:var(--font-head);font-weight:700;line-height:1.4;text-wrap:balance;margin:0 0 .5em}
html[lang="en"] h1,html[lang="en"] h2{font-weight:900}
h1{font-size:2rem} h2{font-size:1.55rem} h3{font-size:1.1rem}
p{margin:0 0 .8em}
a{color:var(--navy)}
.wrap{max-width:1040px;margin:0 auto;padding:0 18px}
.demo{background:var(--gold);color:var(--navy);font-size:.85rem;text-align:center;padding:4px 12px;font-weight:500}
header.top{background:var(--navy);color:#F5F1E8;border-bottom:3px solid var(--gold);position:sticky;top:0;z-index:30}
.top-row{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:12px 0 6px}
.bl{display:flex;flex-direction:column;gap:6px;line-height:1.15}
.bl small{font-size:.72rem;color:var(--pale);white-space:nowrap}
.brand{text-decoration:none;color:#F5F1E8;--hi:var(--gold);display:inline-block}
.wm{font-family:'Montserrat',sans-serif;font-size:1.28rem;line-height:1;letter-spacing:-.5px;white-space:nowrap;display:inline-block;padding-top:.45em}
.wm .a{font-weight:400}
.wm b{font-weight:800;color:var(--gold)}
.s{position:relative;display:inline-block}
.s svg{position:absolute;width:.56em;height:.43em;left:.04em;top:-.46em}
.hr{display:flex;align-items:center;gap:6px;flex:none}
.lang{display:inline-flex;border:1px solid rgba(245,241,232,.4);border-radius:999px;overflow:hidden}
.lang button{min-height:40px;min-width:40px;padding:2px 9px;border:0;background:transparent;color:#F5F1E8;font:inherit;font-weight:700;font-size:.9rem;cursor:pointer}
.lang button[aria-pressed="true"]{background:var(--gold);color:var(--navy)}
.cartpill{display:inline-flex;align-items:center;gap:6px;min-height:40px;padding:4px 11px;white-space:nowrap;border-radius:999px;border:1px solid var(--gold);background:var(--gold);color:var(--navy);font-weight:700;text-decoration:none;font-size:.9rem}
nav.tabs{display:flex;gap:6px;overflow-x:auto;padding:4px 0 11px;scrollbar-width:none}
nav.tabs::-webkit-scrollbar{display:none}
nav.tabs a{white-space:nowrap;padding:5px 13px;border-radius:999px;border:1px solid rgba(245,241,232,.35);color:#F5F1E8;text-decoration:none;font-size:.92rem}
nav.tabs .tabbtn{white-space:nowrap;padding:5px 13px;border-radius:999px;border:1px solid rgba(245,241,232,.35);background:transparent;color:#F5F1E8;font:inherit;font-size:.92rem;cursor:pointer}
nav.tabs .tabbtn[aria-expanded="true"]{border-color:var(--gold);color:var(--gold);font-weight:700}
nav.tabs .tabbtn[aria-current="page"]{background:var(--gold);color:var(--navy);border-color:var(--gold);font-weight:700}
.wmenu{background:var(--navy2);border:1px solid rgba(245,241,232,.2);border-radius:14px;padding:14px 14px 10px;margin:0 0 12px}
.wmenu[hidden]{display:none}
.wmenu .wl{font-size:.8rem;font-weight:700;color:var(--pale);margin:0 0 2px}
.wmenu .wt{font-weight:900;font-size:1.05rem;color:#F5F1E8;margin:0 0 8px}
.wmenu .ws{font-weight:700;color:var(--gold);margin:0 0 6px}
.wmenu a{display:flex;justify-content:space-between;align-items:center;gap:10px;min-height:48px;padding:8px 12px;border-radius:10px;color:#F5F1E8;text-decoration:none;border:1px solid rgba(245,241,232,.2);margin-bottom:8px}
.wmenu a:hover,.wmenu a:focus-visible{background:rgba(255,201,60,.14);border-color:var(--gold)}
.wmenu a span.ar{color:var(--gold);font-weight:900}
@media (min-width:900px){.wmenu .lst{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.wmenu a{margin:0}}
nav.tabs a[aria-current="page"]{background:var(--gold);color:var(--navy);border-color:var(--gold);font-weight:700}
main{min-height:60vh}
.pagepad{padding:28px 18px 40px}
.stack{display:flex;flex-direction:column;gap:16px}
.grid{display:grid;gap:14px}
@media (min-width:700px){.grid.two{grid-template-columns:1fr 1fr}.grid.three{grid-template-columns:1fr 1fr 1fr}.grid.four{grid-template-columns:repeat(4,1fr)}}
@media (min-width:480px) and (max-width:699px){.grid.four{grid-template-columns:1fr 1fr}}
.card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px;box-shadow:0 1px 2px rgba(20,33,79,.05)}
a.card{text-decoration:none;color:inherit;transition:box-shadow .15s,transform .15s}
a.card:hover,.card.lift:hover{box-shadow:0 8px 22px rgba(20,33,79,.12);transform:translateY(-2px)}
.card.soft{background:var(--soft);border-color:transparent;box-shadow:none}
.muted{color:var(--muted)}
.small{font-size:.9rem}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:46px;padding:8px 20px;border-radius:10px;border:2px solid var(--navy);background:var(--navy);color:#F5F1E8;font:inherit;font-weight:700;cursor:pointer;text-decoration:none;font-size:1rem}
.btn.ghost{background:transparent;color:var(--navy)}
.btn.money{background:var(--gold);border-color:var(--gold);color:var(--navy)}
.btn.light{background:transparent;border-color:rgba(245,241,232,.7);color:#F5F1E8}
.btn.on{background:var(--soft);color:var(--navy);border-color:var(--navy)}
.btn.sm{min-height:38px;padding:4px 14px;font-size:.9rem}
:focus-visible{outline:3px solid var(--gold);outline-offset:2px}
header :focus-visible,footer :focus-visible,.navy :focus-visible,.cartbar :focus-visible{outline-color:#fff}
.band{padding:52px 0}
.band.cream{background:var(--cream)}
.band.soft{background:var(--soft)}
.band.navy{background:var(--navy);color:#F5F1E8}
.kicker{display:inline-block;font-size:.8rem;font-weight:700;color:var(--navy);background:var(--soft);border-radius:999px;padding:2px 12px;margin-bottom:10px}
.band.soft .kicker{background:#fff}
.band.navy .kicker{background:rgba(255,201,60,.18);color:var(--gold)}
.center{text-align:center}
.sec-h{max-width:640px;margin:0 auto 28px;text-align:center}
.hero{padding:44px 0 52px;position:relative;overflow:hidden}
.hero .wrap{display:grid;gap:28px;align-items:center}
@media (min-width:820px){.hero .wrap{grid-template-columns:1.1fr .9fr}}
.hero h1{font-size:2.4rem;color:#F5F1E8;margin-bottom:.4em}
html[lang="en"] .hero h1{font-size:2.6rem}
.hero .gl{color:var(--gold)}
.hero p.lead{color:var(--pale);font-size:1.12rem;max-width:520px}
.hero .note{color:var(--pale);font-size:.9rem;margin-top:14px}
.art{width:100%;max-width:400px;margin:0 auto;display:block}
.ft{display:flex;gap:14px;align-items:flex-start}
.ico{flex:none;width:52px;height:52px;border-radius:14px;background:var(--navy);color:var(--gold);display:grid;place-items:center}
.ico svg,.cico svg{width:26px;height:26px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.cico{flex:none;width:44px;height:44px;border-radius:12px;display:grid;place-items:center}
.cico.bn{background:#FFF1C9;color:#7A4A00}
.cico.en{background:var(--soft);color:var(--navy)}
.clsnum{min-width:64px;height:64px;padding:0 22px;border-radius:999px;background:var(--gold);color:var(--navy);display:inline-grid;place-items:center;font-size:1.9rem;font-weight:900;font-family:var(--font-head);margin-bottom:10px;border:3px solid var(--navy)}
.ladder{display:grid;gap:14px}
@media (min-width:700px){.ladder{grid-template-columns:repeat(4,1fr)}}
.step{text-align:center;padding:16px 10px}
.tower{height:92px;display:flex;flex-direction:column;justify-content:flex-end;align-items:center;gap:4px;margin-bottom:10px;--hi:var(--gold)}
.brick{width:64px;height:16px;border-radius:5px;background:var(--navy)}
.tower svg{width:50px;height:38px}
.steps-num{display:inline-block;font-size:.8rem;font-weight:700;color:var(--muted)}
.tabs2{display:inline-flex;background:#fff;border:1px solid var(--line);border-radius:12px;padding:4px;gap:4px;margin-bottom:18px}
.tabs2 button{border:0;background:transparent;font:inherit;font-weight:700;padding:8px 20px;border-radius:9px;cursor:pointer;color:var(--navy);min-height:42px}
.tabs2 button[aria-pressed="true"]{background:var(--navy);color:#F5F1E8}
.ticks{list-style:none;margin:0 0 16px;padding:0;display:flex;flex-direction:column;gap:10px}
.ticks li{display:flex;gap:10px;align-items:flex-start}
.ticks li::before{content:"✓";flex:none;width:24px;height:24px;border-radius:50%;background:var(--gold);color:var(--navy);display:grid;place-items:center;font-weight:900;font-size:.85rem;margin-top:3px}
.price{border:2px solid var(--line)}
.price.best{border-color:var(--gold);box-shadow:0 8px 24px rgba(255,201,60,.25);position:relative}
.badge{position:absolute;top:-12px;right:16px;background:var(--gold);color:var(--navy);font-size:.8rem;font-weight:900;padding:2px 12px;border-radius:999px}
.bigp{font-family:var(--font-head);font-weight:900;font-size:2.4rem;color:var(--navy);line-height:1.1}
.price-chip{display:inline-block;background:var(--gold);color:var(--navy);font-weight:700;padding:1px 10px;border-radius:999px;font-size:.9rem}
.seg{display:flex;gap:8px;flex-wrap:wrap}
.seg .btn{flex:1;min-width:90px}
.plist{display:grid;background:#fff;border:1px solid var(--line);border-radius:16px;overflow:hidden}
@media (min-width:900px){.plist{grid-template-columns:1fr 1fr}.plist .row2:nth-child(odd){border-right:1px solid var(--line)}}
.row2{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 16px;border-bottom:1px solid var(--line);min-height:58px}
.row2.cat{flex-direction:row;align-items:center;gap:12px}
.row2[hidden]{display:none}
.row2 .rt{min-width:0;display:flex;flex-direction:column;gap:2px}
.row2 .rn{font-weight:700;font-size:1rem;line-height:1.5;color:var(--ink)}
.row2 .rn small{font-weight:400;color:var(--muted);font-size:.85rem;margin-left:6px}
.row2 .rd{color:var(--muted);font-size:.92rem;line-height:1.6}
.row2 .ra{flex:none;display:flex;align-items:center;gap:6px}
.lnk{border:0;background:transparent;font:inherit;font-weight:700;color:var(--navy);text-decoration:underline;text-underline-offset:3px;min-height:44px;padding:0 8px;cursor:pointer}
.add{flex:none;width:44px;height:44px;border-radius:50%;border:2px solid var(--navy);background:#fff;color:var(--navy);font:inherit;font-size:1.5rem;font-weight:400;line-height:1;cursor:pointer;display:grid;place-items:center;padding:0}
.add.on{background:var(--gold);border-color:var(--gold);font-weight:900;font-size:1.2rem}
.add:hover{background:var(--soft)}.add.on:hover{background:var(--gold)}
.insc{font-size:.82rem;font-weight:700;color:var(--navy);background:var(--soft);padding:2px 10px;border-radius:999px;white-space:nowrap}
.sech{display:flex;align-items:baseline;justify-content:space-between;gap:10px;margin:10px 0 8px}
.sech h2{margin:0}
@media (max-width:420px){.row2{padding:12px}.row2 .rn small{display:block;margin:0}.lnk{padding:0 4px}}
.row2.cat{flex-wrap:wrap}
.vbtn,.dbtn{display:inline-flex;align-items:center;justify-content:center;gap:6px;height:34px;padding:0 14px;border-radius:8px;border:1px solid transparent;font:inherit;font-size:.86rem;font-weight:700;cursor:pointer;white-space:nowrap;transition:background .12s,border-color .12s}
.vbtn svg,.dbtn svg{width:15px;height:15px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;flex:none}
.vbtn{background:#fff;color:var(--navy);border-color:#C9D0EA}.vbtn:hover{background:var(--soft);border-color:var(--navy)}
.dbtn{background:var(--gold);border-color:var(--gold);color:var(--navy)}.dbtn:hover{background:#FFD66B;border-color:#FFD66B}
.dbtn.in{background:var(--soft);border-color:var(--navy)}.dbtn.in:hover{background:var(--soft)}
.dbtn.inc{background:var(--soft);border-color:transparent;color:var(--muted);cursor:default}
@media (max-width:560px){.row2.cat{padding:12px}.row2.cat .rt{flex:1 1 100%}.row2.cat .ra{flex:1 1 100%;gap:8px;justify-content:flex-start}.row2.cat .ra>*{flex:none;height:34px;padding:0 14px}}
.steps3{display:grid;gap:8px;grid-template-columns:repeat(3,1fr)}
.steps3 div{background:#fff;border:1px solid var(--line);border-radius:12px;padding:10px 12px;font-size:.92rem;line-height:1.5}
.steps3 b{display:inline-grid;place-items:center;width:24px;height:24px;border-radius:50%;background:var(--navy);color:#F5F1E8;font-size:.8rem;margin-right:6px}
@media (max-width:560px){.steps3{grid-template-columns:repeat(3,1fr);gap:6px}.steps3 div{padding:9px 6px;font-size:.78rem;text-align:center;line-height:1.35}.steps3 b{display:grid;margin:0 auto 5px}}
.strip{width:100%;display:flex;align-items:center;justify-content:space-between;gap:10px;min-height:44px;padding:8px 14px;border-radius:10px;border:1px solid var(--gold);background:#FFFBEA;color:var(--ink);font:inherit;font-size:.92rem;cursor:pointer;text-align:left}
.strip b{font-weight:900}.strip .go{flex:none;font-weight:700;color:var(--navy);text-decoration:underline;text-underline-offset:3px}
.strip:hover{background:#FFF4CC}
.deals{display:grid;gap:10px;grid-template-columns:repeat(3,1fr)}
@media (max-width:700px){.deals{grid-template-columns:1fr}}
.deal{background:#fff;border:2px solid var(--line);border-radius:14px;padding:12px 14px;display:flex;align-items:center;justify-content:space-between;gap:10px;text-align:left;font:inherit;color:var(--ink);cursor:pointer;position:relative}
.deal.best{border-color:var(--gold);background:#FFFBEA}
.deal.on{background:var(--soft);border-color:var(--navy)}
.deal b.pr{font-family:var(--font-head);font-weight:900;font-size:1.5rem;line-height:1.1;display:block}
.deal .sv{font-size:.82rem;font-weight:700;color:#1B7A44}
.deal .nm{font-weight:700}
.deal .go{flex:none;font-weight:700;color:var(--navy);text-decoration:underline;text-underline-offset:3px}
.paper{position:relative;border:1px solid var(--line);border-radius:12px;background:#fff;overflow:hidden;margin-top:10px}
.paper .pt{padding:16px 16px 6px}
.paper .pb{position:relative;padding:6px 16px 16px;min-height:170px}
.paper .pb .bl{filter:blur(6px);user-select:none;pointer-events:none}
.paper .lock{position:absolute;inset:0;display:grid;place-items:center;align-content:center;gap:8px;text-align:center;padding:12px;background:linear-gradient(rgba(255,255,255,.1),rgba(255,255,255,.8) 55%)}
.field{display:flex;flex-direction:column;gap:4px}
.field label{font-weight:700}
.field input{min-height:48px;padding:8px 12px;border-radius:10px;border:2px solid var(--line);font:inherit;color:var(--ink);background:#fff}
.dealbox{background:#FFFBEA;border:2px solid var(--gold);border-radius:12px;padding:12px;display:flex;flex-direction:column;gap:8px;margin-top:12px}
.dealbox .rw{display:flex;justify-content:space-between;align-items:center;gap:8px}
.cartbar .hint{color:var(--gold);font-size:.85rem}

.cat .top{display:flex;gap:12px;align-items:flex-start}
.cat h3{margin:0;font-size:1.02rem}
.tag{font-size:.78rem;padding:0 8px;border-radius:6px;background:var(--soft);color:var(--navy);font-weight:700;display:inline-block}
.bundle{border:2px solid var(--gold);background:#FFFBEA}
input.search{width:100%;min-height:48px;padding:8px 14px 8px 42px;border-radius:12px;border:2px solid var(--line);background:#fff url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' viewBox='0 0 24 24' fill='none' stroke='%234F5B7A' stroke-width='2.2' stroke-linecap='round'%3E%3Ccircle cx='11' cy='11' r='7'/%3E%3Cpath d='M20 20l-4-4'/%3E%3C/svg%3E") no-repeat 12px center;color:var(--ink);font:inherit}
.cartbar{position:sticky;bottom:12px;background:var(--navy);color:#F5F1E8;border:2px solid var(--gold);border-radius:14px;padding:10px 16px;display:flex;justify-content:space-between;align-items:center;gap:10px;box-shadow:0 8px 24px rgba(14,23,56,.3);margin-top:8px}
.cartbar .muted{color:var(--pale)}
.pad{display:grid;place-items:center;background:var(--soft);border-radius:10px;min-height:120px;color:var(--navy)}
.lines{list-style:none;margin:0;padding:0}
.lines li{display:flex;justify-content:space-between;gap:10px;padding:8px 0;border-bottom:1px solid var(--line)}
.lines li:last-child{border-bottom:0}
label.opt{display:flex;gap:10px;align-items:center;min-height:46px;padding:6px 12px;border:2px solid var(--line);border-radius:10px;cursor:pointer}
input[type=tel]{width:100%;min-height:48px;padding:8px 12px;border-radius:10px;border:2px solid var(--line);background:#fff;color:var(--ink);font:inherit}
.err{color:var(--danger);font-size:.9rem;min-height:1.4em}
details.q{background:#fff;border:1px solid var(--line);border-radius:12px;padding:12px 16px}
details.q summary{cursor:pointer;font-weight:700}
.overlay{position:fixed;inset:0;background:rgba(14,23,56,.6);display:flex;align-items:flex-end;justify-content:center;z-index:50}
.overlay[hidden]{display:none}
.sheet{background:#fff;color:var(--ink);width:100%;max-width:640px;max-height:88%;overflow:auto;border-radius:16px 16px 0 0;padding:18px 16px 26px}
.sheet .key{background:var(--soft);border-radius:10px;padding:10px 12px;margin-top:12px}
.toast{position:fixed;left:50%;bottom:90px;transform:translateX(-50%);background:var(--navy2);color:#F5F1E8;padding:8px 16px;border-radius:10px;font-size:.92rem;z-index:60;max-width:90%;border:1px solid var(--gold)}
.toast[hidden]{display:none}
footer{background:var(--navy);color:var(--pale);padding:40px 0 30px;font-size:.92rem;border-top:3px solid var(--gold)}
footer .fgrid{display:grid;gap:26px}
@media (min-width:700px){footer .fgrid{grid-template-columns:1.4fr 1fr 1fr 1fr}}
footer h4{color:#F5F1E8;margin:0 0 8px;font-size:.95rem}
footer a{color:var(--pale);text-decoration:none;display:block;padding:3px 0}
footer a:hover{color:var(--gold)}
footer .brand .wm{font-size:1.15rem}
footer .copy{border-top:1px solid rgba(201,208,234,.25);margin-top:26px;padding-top:16px}
@media (prefers-reduced-motion: reduce){*{scroll-behavior:auto;transition:none!important}}

.wmenu .wb{display:flex;align-items:center;gap:8px;font-size:.84rem;color:var(--pale);margin:0 0 10px;line-height:1.4}
.wmenu .wb b{color:#F5F1E8}.wmenu .wb span:last-child{color:var(--gold);font-weight:700}
.cartpill svg{flex:none}
@media (max-width:640px){
  body{font-size:16px;line-height:1.7}
  .wrap{padding:0 16px}
  .demo{font-size:.74rem;line-height:1.4;padding:4px 10px}
  header.top{position:relative}
  .top-row{padding:10px 0 2px;gap:8px}
  .bl{min-width:0;gap:5px}
  .wm{font-size:1.06rem}
  .bl small{font-size:.66rem}
  .hr{gap:6px}
  .lang button{min-height:34px;min-width:34px;padding:2px 8px;font-size:.8rem}
  .cartpill{min-height:34px;padding:2px 11px;font-size:.84rem;gap:5px}
  nav.tabs{gap:6px;padding:8px 0 12px}
  nav.tabs a,nav.tabs .tabbtn{min-height:34px;display:inline-flex;align-items:center;padding:3px 13px;font-size:.84rem}
  .wmenu{padding:12px;border-radius:12px;margin:0 0 12px}
  .wmenu a{min-height:46px;padding:9px 12px;font-size:.9rem;line-height:1.4;margin-bottom:8px;border-radius:10px}
  .wmenu a:last-child{margin-bottom:0}
}
@media (max-width:380px){.cartpill .cw{display:none}}

.logo{display:block;height:40px;width:auto;margin-left:-6px}
footer .logo{height:46px;margin-left:-7px}
.demo{background:var(--navy2);color:var(--pale);font-size:.76rem;padding:5px 12px;font-weight:400;letter-spacing:.01em}
@media (max-width:640px){
  .demo{font-size:.7rem;padding:4px 10px;line-height:1.3}
  .top-row{padding:12px 0 6px;gap:10px;align-items:center}
  .logo{height:34px;max-width:46vw;margin-left:-5px}
  .bl small{display:none}
  .cartpill .cw{display:none}
  .cartpill{padding:2px 12px}
  nav.tabs{gap:2px;padding:0;margin:0 -16px;padding:0 10px;border-top:1px solid rgba(245,241,232,.14);scroll-padding:0 10px}
  nav.tabs a,nav.tabs .tabbtn{border:0;border-radius:0;background:transparent;min-height:44px;padding:0 10px;font-size:.88rem;color:var(--pale);border-bottom:3px solid transparent;position:relative}
  nav.tabs a[aria-current="page"],nav.tabs .tabbtn[aria-current="page"]{background:transparent;color:var(--gold);border-bottom-color:var(--gold);border-color:transparent;font-weight:700}
  nav.tabs .tabbtn[aria-expanded="true"]{color:var(--gold);border-bottom-color:rgba(255,201,60,.6);background:transparent;font-weight:700}
  nav.tabs a[aria-current="page"]{border-bottom-color:var(--gold)}
  .wmenu{margin:8px 0 12px}
}

/* softer, smaller buttons: no borders, light effect, gold only when selected */
.btn{min-height:40px;padding:6px 16px;border:0;border-radius:10px;font-size:.92rem;font-weight:700;box-shadow:0 1px 3px rgba(14,23,56,.22);transition:background .15s,box-shadow .15s,transform .15s}
.btn:hover{box-shadow:0 3px 10px rgba(14,23,56,.2);transform:translateY(-1px)}
.btn.ghost{background:var(--soft);color:var(--navy);box-shadow:none}
.btn.ghost:hover{background:#DCE3F5;box-shadow:none}
.btn.money{background:var(--gold);color:var(--navy);box-shadow:0 2px 8px rgba(255,201,60,.35)}
.btn.light{background:rgba(245,241,232,.14);color:#F5F1E8;box-shadow:none}
.btn.light:hover{background:rgba(245,241,232,.22);box-shadow:none}
.btn.on{background:var(--soft);color:var(--navy);box-shadow:none}
.btn.sm{min-height:34px;padding:3px 12px;font-size:.84rem}
.seg .btn{min-height:40px}
.seg .btn[aria-pressed="true"]{background:var(--gold);color:var(--navy);box-shadow:0 2px 8px rgba(255,201,60,.35)}
.seg .btn[aria-pressed="false"]{background:var(--soft);color:var(--navy);box-shadow:none}
.vbtn,.dbtn{height:30px;padding:0 12px;border:0;border-radius:8px;font-size:.8rem;box-shadow:none}
.vbtn{background:transparent;color:var(--muted)}.vbtn:hover{background:var(--soft);color:var(--navy);border:0}
.dbtn{background:var(--soft);color:var(--navy)}.dbtn:hover{background:#DCE3F5;border:0}
.dbtn.in{background:var(--gold);color:var(--navy);box-shadow:0 2px 6px rgba(255,201,60,.4)}.dbtn.in:hover{background:#FFD35C}
.dbtn.inc{background:#FFF1C9;color:#7A4A00}
.strip{border:0;background:#FFF6D6}.strip:hover{background:#FFF0BE}
.lang{border:0;background:rgba(245,241,232,.12)}
.lang button{min-height:30px;min-width:30px;padding:0 10px;font-size:.78rem}
.cartpill{min-height:30px;padding:0 12px;font-size:.8rem;border:0;box-shadow:0 1px 4px rgba(0,0,0,.25)}
.cartpill svg{width:15px;height:15px}
.logo{height:46px;width:auto;margin-left:-7px}
.bl small{font-size:.82rem}
@media (max-width:640px){
  .logo{height:auto;width:min(50vw,200px);max-width:none;margin-left:-6px}
  .bl{gap:2px}
  .bl small{display:block;font-size:min(.8rem,3.3vw);margin-top:-1px;white-space:nowrap}
  .lang button{min-height:30px;min-width:30px;padding:0 9px;font-size:.76rem}
  .cartpill{min-height:30px;padding:0 11px}
  .top-row{padding:12px 0 8px}
}

/* tick boxes and cart details */
.tick{position:relative;display:inline-grid;place-items:center;width:40px;height:40px;cursor:pointer;flex:none}
.tick input,.selall input{position:absolute;opacity:0;inset:0;width:100%;height:100%;margin:0;cursor:pointer}
.box{width:22px;height:22px;border-radius:7px;border:2px solid #9AA6CC;background:#fff;display:grid;place-items:center;transition:background .12s,border-color .12s;flex:none}
input:checked+.box,input:indeterminate+.box{background:var(--gold);border-color:var(--gold)}
input:checked+.box::after{content:"";width:10px;height:5px;border-left:3px solid var(--navy);border-bottom:3px solid var(--navy);transform:rotate(-45deg) translate(1px,-1px)}
input:indeterminate+.box::after{content:"";width:10px;height:3px;background:var(--navy);border-radius:2px}
input:focus-visible+.box{outline:3px solid var(--navy);outline-offset:2px}
.tick.dis{cursor:default}.tick.dis input{cursor:default}.tick.dis input:checked+.box{background:#FFE9A8;border-color:#FFE9A8}
.selall{position:relative;display:inline-flex;align-items:center;gap:10px;cursor:pointer;min-height:44px}
.selall .box{width:26px;height:26px;border-radius:8px}
.selall input{width:44px;height:44px;inset:auto;left:-9px;top:50%;transform:translateY(-50%)}
.selall .hh{font-family:var(--font-head);font-weight:700;font-size:1.55rem;line-height:1.2;color:var(--ink)}
html[lang="en"] .selall .hh{font-weight:900}
.selall .tag{font-size:.74rem}
.sech{flex-wrap:wrap;align-items:center}
.rt2{font-size:.9rem;color:var(--muted)}.rt2 s{color:var(--muted)}.rt2 b{color:var(--ink)}
.sv{color:#1B7A44;font-weight:700}
.cartbar{display:block;padding:10px 14px}
.cartbar .cb-main{display:flex;justify-content:space-between;align-items:center;gap:10px}
.cb-total{font-family:var(--font-head);font-weight:900;font-size:1.4rem;line-height:1.2;display:block}
.cb-total s{color:var(--pale);font-weight:400;font-size:1rem;margin-right:4px}
.cartbar .small{font-size:.82rem}
.sv2{color:var(--gold);font-weight:700}
.lnk2{border:0;background:transparent;color:var(--gold);font:inherit;font-weight:700;text-decoration:underline;text-underline-offset:3px;cursor:pointer;padding:4px 2px}
.cb-det{border-bottom:1px solid rgba(245,241,232,.18);margin:0 0 8px;padding:0 0 8px;font-size:.88rem;line-height:1.5}
.cb-det .dl{display:flex;justify-content:space-between;gap:10px;padding:2px 0}
.cb-det .dl s{color:var(--pale)}.cb-det .dh{font-weight:700;color:var(--gold);margin-top:4px}
.cb-det .both{border-top:1px dashed rgba(245,241,232,.25);margin-top:4px;padding-top:6px;font-weight:700}
.cartbar .hint{margin-top:6px;line-height:1.4}
@media (max-width:560px){.row2.cat .ra>.tick{height:40px;padding:0;margin-left:auto}.selall .hh{font-size:1.35rem}.sech{gap:2px 10px}}

/* mobile: one compact line per item: name, View, Download, tick */
.row2.cat{gap:12px}
.row2.cat .rt{flex:1 1 auto;min-width:0}
.row2.cat .ra{flex:none}
.legend{display:none}
@media (max-width:560px){
  .row2.cat{flex-wrap:nowrap;align-items:center;gap:4px;padding:6px 6px 6px 12px;min-height:56px}
  .row2.cat .rt{flex:1 1 0;min-width:0}
  .row2.cat .rn{font-size:.92rem;line-height:1.4}
  .row2.cat .ra{flex:none;gap:2px;justify-content:flex-end}
  .row2.cat .ra>.vbtn,.row2.cat .ra>.dbtn{flex:none;width:auto;height:34px;padding:0 7px;font-size:.72rem;gap:4px;border-radius:8px;display:inline-flex}
  .row2.cat .ra>.vbtn{background:transparent;padding:0 5px}
  .row2.cat .ra .bt{display:inline}
  .row2.cat .ra svg{width:14px;height:14px}
  .row2.cat .tick{order:0;width:36px;height:40px}
}
@media (max-width:340px){.row2.cat .ra>.vbtn svg{display:none}}

a.card.pc{display:flex;flex-direction:column;gap:4px;padding:16px 18px;text-decoration:none;color:var(--ink)}
.pc .pn{font-family:var(--font-head);font-weight:700;font-size:1.12rem;line-height:1.4;color:var(--ink)}
.pc .pl{margin-top:6px;font-weight:700;font-size:.86rem;color:var(--navy);text-decoration:underline;text-underline-offset:3px}
.cover{aspect-ratio:16/8;background:var(--navy);border-radius:12px;display:grid;place-items:center;align-content:center;gap:6px;color:#F5F1E8;font-family:var(--font-head);font-weight:700;letter-spacing:.02em}
.cover svg{width:46px;height:35px}
.pc .pn.bn{font-size:1.25rem}

/* ===== Header E: Khan Academy style ===== */
header.kh{position:sticky;top:0;z-index:40;background:#fff;border-bottom:1px solid #E6E8F0;font-family:var(--font-body)}
.kh-bar{max-width:1240px;margin:0 auto;height:70px;padding:0 24px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:16px}
.kh-l,.kh-r{display:flex;align-items:center;gap:12px;min-width:0}
.kh-r{justify-content:flex-end;gap:14px}
.ki{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round;flex:none}
.kh-burger{display:none;width:42px;height:42px;border:0;background:transparent;color:var(--navy);border-radius:10px;cursor:pointer;place-items:center}
.kh-burger .ki{width:24px;height:24px}
.kh-explore{display:inline-flex;align-items:center;gap:6px;height:42px;padding:0 12px;border:0;background:transparent;border-radius:10px;color:var(--navy);font:inherit;font-weight:700;font-size:1rem;cursor:pointer}
.kh-explore .ki{width:16px;height:16px;transition:transform .2s}
.kh-explore[aria-expanded="true"]{background:var(--soft)}
.kh-explore[aria-expanded="true"] .ki{transform:rotate(180deg)}
.kh-explore:hover,.kh-burger:hover{background:var(--soft)}
.kh-search,.kh-msearch{display:flex;align-items:center;gap:8px;height:42px;padding:0 14px;background:#F3F4F8;border:1px solid #E1E4EE;border-radius:10px;color:#7A84A3;width:min(330px,100%);transition:border-color .15s,background .15s}
.kh-search:focus-within,.kh-msearch:focus-within{background:#fff;border-color:var(--navy)}
.kh-search input,.kh-msearch input{border:0;background:transparent;outline:0;font:inherit;font-size:.92rem;color:var(--ink);width:100%;min-width:0}
.kh-brand{color:var(--navy);text-decoration:none;display:block}
.kwm{font-family:'Montserrat',sans-serif;font-size:27px;letter-spacing:-.6px;white-space:nowrap;line-height:1;display:inline-block;padding-top:13px}
.kwm .ka{font-weight:400}.kwm b{font-weight:800}
.ks{position:relative;display:inline-block}
.ks svg{position:absolute;width:.56em;height:.43em;left:.04em;top:-.46em}
.kh-lang{display:flex;align-items:center;gap:2px;color:#A3ABC4;font:700 .82rem 'Lato',sans-serif}
.kh-lang button{border:0;background:transparent;font:inherit;color:#8A93AE;cursor:pointer;padding:6px 4px;border-radius:6px}
.kh-lang button[aria-pressed="true"]{color:var(--navy)}
.kh-cart{position:relative;display:grid;place-items:center;width:40px;height:40px;border-radius:10px;color:var(--navy);text-decoration:none}
.kh-cart:hover{background:var(--soft)}
.kh-cart .ki{width:22px;height:22px}
.kh-cart i{position:absolute;top:2px;right:0;min-width:18px;height:18px;padding:0 5px;border-radius:99px;background:var(--gold);color:var(--navy2);font:900 11px/18px 'Lato',sans-serif;font-style:normal;text-align:center}
.kh-login{color:var(--navy);font-weight:700;font-size:.95rem;text-decoration:none;padding:8px 8px;border-radius:8px}
.kh-login:hover{background:var(--soft)}
.kh-cta{background:var(--navy);color:#fff;font-weight:700;font-size:.95rem;text-decoration:none;padding:10px 18px;border-radius:10px;white-space:nowrap;transition:background .15s,transform .15s}
.kh-cta:hover{background:var(--navy3);transform:translateY(-1px)}
.kh-panel{position:absolute;top:calc(100% - 6px);left:max(24px,calc((100vw - 1240px)/2 + 24px));width:660px;background:#fff;border-radius:16px;box-shadow:0 18px 50px rgba(14,23,56,.28);padding:18px 20px 20px;animation:khIn .18s ease-out}
.kh-panel[hidden]{display:none}
@keyframes khIn{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:none}}
.kh-ph{margin:0 0 8px 10px;font:700 .72rem 'Lato',sans-serif;letter-spacing:.14em;text-transform:uppercase;color:#8A93AE}
.kh-grid{display:grid;grid-template-columns:1fr 1fr;gap:4px 18px}
.kh-grid a{display:flex;gap:12px;align-items:flex-start;padding:10px;border-radius:12px;text-decoration:none;color:inherit;transition:background .12s}
.kh-grid a:hover,.kh-grid a:focus-visible,.kh-grid a[aria-current="page"]{background:#F4F6FB}
.kh-grid .kib{width:40px;height:40px;border-radius:11px;background:var(--navy);color:var(--gold);display:grid;place-items:center;flex:none}
.kh-grid a[aria-current="page"] .kib{background:var(--gold);color:var(--navy)}
.kh-grid b{display:block;font-size:1rem;color:var(--navy);line-height:1.4}
.kh-grid span.kd{display:block;font-size:.84rem;color:var(--muted);line-height:1.45}
.kh-msearch,.kh-mfoot{display:none}
.kh-scrim{position:fixed;inset:0;background:rgba(14,23,56,.35);z-index:35}
.kh-scrim[hidden]{display:none}
@media (max-width:1100px){.kh-search{width:220px}.kh-login{display:none}}
@media (max-width:900px){
  .kh-bar{height:62px;padding:0 12px;grid-template-columns:48px 1fr auto;gap:6px}
  .kh-burger{display:grid}
  .kh-explore,.kh-search,.kh-lang,.kh-login,.kh-cta{display:none}
  .kh-brand{justify-self:center}
  .kwm{font-size:23px;padding-top:11px}
  .kh-panel{position:absolute;top:100%;left:0;right:0;height:calc(100dvh - 62px);width:auto;border-radius:0;box-shadow:none;overflow-y:auto;padding:14px 14px 28px}
  .kh-msearch{display:flex;width:100%;margin:0 0 14px;height:46px}
  .kh-grid{grid-template-columns:1fr;gap:2px}
  .kh-mfoot{display:flex;gap:10px;align-items:center;justify-content:space-between;margin-top:16px;padding-top:16px;border-top:1px solid #E6E8F0}
  .kh-mfoot .kh-lang{display:flex;font-size:.95rem}
  .kh-mfoot .kh-cta{display:inline-block}
}