:root{--b:#1a4fa3;--bg:#f3f6fb;--tx:#16233b}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
body{margin:0;background:#dfe6f2;color:var(--tx);font-family:system-ui,sans-serif}
#app{max-width:480px;margin:auto;min-height:100vh;background:var(--bg);padding-bottom:70px;position:relative}
header{display:flex;align-items:center;justify-content:space-between;background:#fff;padding:12px 14px;position:sticky;top:0;z-index:5;box-shadow:0 1px 4px #0001}
header button{font-size:24px;background:none;border:0;cursor:pointer}
.logo{color:var(--b);font-size:19px;letter-spacing:.5px}
.hero{text-align:center;color:var(--b);font-size:20px;margin:16px 16px 10px;text-transform:uppercase}
.banner{margin:0 14px 14px;padding:18px;border-radius:14px;color:#fff;background:linear-gradient(135deg,#1a4fa3,#e0463c)}
.banner b{display:block;font-size:22px;margin:4px 0 10px}
.banner i{display:inline-block;font-style:normal;font-size:11px;font-weight:700;background:#e0463c;border:1px solid #fff8;padding:3px 7px;margin:0 6px 6px 0;border-radius:4px}
#tiles{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;padding:0 14px}
.tile{background:#fff;border:0;border-radius:12px;padding:14px 4px;box-shadow:0 1px 5px #0002;cursor:pointer;font-weight:600;font-size:13px;color:var(--tx)}
.tile span{display:flex;width:46px;height:46px;margin:0 auto 8px;border-radius:12px;align-items:center;justify-content:center;font-size:26px}
.bar{display:flex;align-items:center;gap:10px;padding:10px 14px}
.bar button{font-size:22px;border:0;background:none;cursor:pointer}
.bar h3{margin:0}
#q{display:block;width:calc(100% - 28px);margin:0 14px 8px;padding:10px 14px;border-radius:20px;border:1px solid #ccd5e5}
#cats{display:flex;gap:8px;overflow-x:auto;padding:0 14px 8px}
#cats button{white-space:nowrap;padding:6px 13px;border:0;border-radius:16px;background:#fff;cursor:pointer}
#cats button.on{background:var(--b);color:#fff}
.item{display:flex;align-items:center;gap:12px;background:#fff;margin:8px 14px;padding:10px;border-radius:12px;box-shadow:0 1px 4px #0001;cursor:pointer}
.ic{width:54px;height:54px;border-radius:10px;background:#e8f0ff;background-size:cover;background-position:center;display:flex;align-items:center;justify-content:center;font-size:24px;flex:none}
.item div:nth-child(2){flex:1;min-width:0}
.item b{display:block;font-size:14px}
.item small{opacity:.6}
.star{border:0;background:none;font-size:22px;cursor:pointer}
#msg,.pad{text-align:center;opacity:.7;padding:0 16px}
nav{position:fixed;bottom:0;left:50%;transform:translateX(-50%);width:100%;max-width:480px;display:flex;background:#fff;border-top:1px solid #dde;z-index:6}
nav a{flex:1;text-align:center;text-decoration:none;color:var(--tx);padding:8px 0;font-size:20px;cursor:pointer;opacity:.55}
nav a.on{opacity:1;color:var(--b)}
nav span{display:block;font-size:11px}
#drawer{position:fixed;inset:0;background:#0006;z-index:20}
#drawer[hidden],#modal[hidden]{display:none}
main{display:block}
#modal{position:fixed;inset:0;background:#000d;display:flex;align-items:center;justify-content:center;padding:12px;z-index:30}
.box{width:100%;max-width:700px;background:#fff;border-radius:12px;padding:12px;position:relative}
#close{position:absolute;right:8px;top:8px;z-index:2;border:0;background:#000a;color:#fff;border-radius:50%;width:32px;height:32px}
#player>video,#player>iframe{width:100%;aspect-ratio:16/9;border:0;border-radius:8px;background:#000}
[hidden]{display:none!important}
#authscreen{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px;background:linear-gradient(135deg,#1a4fa3,#e0463c)}
.acard{width:100%;max-width:380px;background:#fff;border-radius:16px;padding:26px 22px;text-align:center;box-shadow:0 8px 30px #0004}
.alogo{margin:0 0 6px;color:#1a4fa3;font-size:24px}
.asub{margin:0 0 14px;opacity:.7}
.acard input{display:block;width:100%;margin:0 0 10px;padding:12px 14px;border:1px solid #ccd5e5;border-radius:10px;font-size:15px}
.gbtn,.pbtn{width:100%;padding:12px;border-radius:10px;font-size:15px;font-weight:600;cursor:pointer}
.gbtn{background:#fff;border:1px solid #ccd5e5;color:#16233b}
.pbtn{background:#1a4fa3;border:0;color:#fff}
.or{margin:12px 0;opacity:.5;font-size:13px}
.alinks{display:flex;justify-content:space-between;gap:8px;font-size:13px;margin:12px 0 0}
.alinks a{color:#1a4fa3;cursor:pointer}
.amsg{color:#c62828;font-size:13px;min-height:18px;margin:10px 0 0}
.locked #app,.locked #drawer{visibility:hidden}
#splash{position:fixed;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;background:#f3f6fb;z-index:50;text-align:center;padding:24px}
#splash button{padding:10px 24px;border:0;border-radius:20px;background:#1a4fa3;color:#fff;font-size:15px;cursor:pointer}
body:not(.locked) #splash{display:none}

.spin{width:44px;height:44px;border:4px solid #d5def0;border-top-color:#1a4fa3;border-radius:50%;animation:rwhspin .8s linear infinite;margin:0 auto}
.spin.sm{width:30px;height:30px;border-width:3px;margin:18px auto}
@keyframes rwhspin{to{transform:rotate(360deg)}}

/* ---- Help page ---- */
.hcard{display:flex;align-items:center;gap:14px;background:#fff;margin:10px 14px;padding:12px 14px;border-radius:12px;box-shadow:0 1px 4px #0001;color:var(--tx);text-decoration:none}
.hcard .hi{width:44px;height:44px;border-radius:12px;background:#e8f0ff;display:flex;align-items:center;justify-content:center;font-size:22px;flex:none}
.hcard b{display:block;font-size:15px}
.hcard small{opacity:.6}
.hh{margin:20px 16px 6px;color:var(--b)}
.faq{background:#fff;margin:8px 14px;border-radius:10px;padding:12px 14px;box-shadow:0 1px 4px #0001}
.faq summary{font-weight:600;cursor:pointer}
.faq p{margin:8px 0 0;opacity:.75;line-height:1.5;text-align:left;padding:0}



/* ---- side menu ---- */
.dr{width:290px;max-width:84vw;height:100%;background:#fff;display:flex;flex-direction:column;border-radius:0 26px 26px 0;overflow:hidden;box-shadow:8px 0 30px #0004}
#drawer:not([hidden]) .dr{animation:drin .28s cubic-bezier(.2,.8,.2,1)}
@keyframes drin{from{transform:translateX(-100%)}to{transform:none}}
.dh{position:relative;padding:30px 20px 26px;color:#fff;background:linear-gradient(145deg,#12408a,#1a4fa3 50%,#d9473f 135%);overflow:hidden}
.dh::before{content:"";position:absolute;right:-44px;top:-44px;width:160px;height:160px;border-radius:50%;background:#ffffff14}
.dh::after{content:"";position:absolute;right:34px;bottom:-64px;width:124px;height:124px;border-radius:50%;background:#ffffff10}
.brand{position:relative;font-size:11px;font-weight:700;letter-spacing:2px;text-transform:uppercase;opacity:.85;margin-bottom:20px}
.dp{position:relative;display:flex;align-items:center;gap:14px}
.av{flex:none;width:64px;height:64px;border-radius:50%;background:#fff;color:#1a4fa3;display:flex;align-items:center;justify-content:center;font-size:30px;font-weight:800;box-shadow:0 0 0 3px #ffffff66,0 6px 16px #0003}
.dn{min-width:0;flex:1}
#who{font-size:17px;font-weight:800;letter-spacing:.8px;text-transform:uppercase;line-height:1.2;word-break:break-word;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
#mail{font-size:12px;opacity:.8;margin-top:4px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
#mail:empty{display:none}
.dm{padding:16px 12px 0;display:flex;flex-direction:column;gap:6px}
.mi{position:relative;display:flex;align-items:center;gap:14px;padding:10px 12px;border-radius:14px;color:var(--tx);text-decoration:none;font-size:15px;font-weight:600;cursor:pointer}
.mi:active{background:#eef3fb}
.mi.on{background:#e8f0ff;color:var(--b)}
.mi.on::before{content:"";position:absolute;left:-12px;top:10px;bottom:10px;width:5px;border-radius:0 5px 5px 0;background:var(--b)}
.mic{flex:none;width:38px;height:38px;border-radius:11px;display:flex;align-items:center;justify-content:center;font-size:19px}
.ml{flex:1}
.mc{opacity:.35;font-size:22px;line-height:1}
.df{margin-top:auto;padding:12px 12px 18px}
.mi.out{background:#fdecea;color:#c0392b}
.mi.out .mic{background:#fff}
.ver{text-align:center;font-size:11px;opacity:.45;margin-top:12px;letter-spacing:.3px}

/* ---- logout confirmation ---- */
.lg{position:fixed;inset:0;z-index:60;background:#0a1a3a99;backdrop-filter:blur(3px);display:flex;align-items:center;justify-content:center;padding:22px;animation:lgfade .2s}
.lg[hidden]{display:none}
.lgb{width:100%;max-width:340px;background:#fff;border-radius:22px;padding:26px 22px 20px;text-align:center;box-shadow:0 18px 50px #0006;animation:lgpop .28s cubic-bezier(.2,.9,.3,1.2)}
.lgi{width:68px;height:68px;margin:0 auto 14px;border-radius:50%;background:#fdecea;display:flex;align-items:center;justify-content:center;font-size:32px;box-shadow:0 0 0 8px #fdecea66}
.lgb h3{margin:0 0 6px;font-size:20px}
.lgb p{margin:0 0 20px;font-size:14px;line-height:1.5;opacity:.7}
.lgbtn{display:flex;gap:10px}
.lgbtn button{flex:1;padding:13px 0;border-radius:12px;font-size:15px;font-weight:700;cursor:pointer;font-family:inherit}
#lgc{background:#fff;border:1.5px solid #ccd5e5;color:var(--tx)}
#lgc:active{background:#f1f4fa}
#lgo{background:#d9473f;border:0;color:#fff;box-shadow:0 4px 12px #d9473f55}
#lgo:active{background:#c0392b}
#lgo:disabled{opacity:.7;cursor:default}
@keyframes lgfade{from{opacity:0}to{opacity:1}}
@keyframes lgpop{from{transform:scale(.88);opacity:0}to{transform:none;opacity:1}}

/* ---- payments (shared by paid.html and payments.html) ---- */
.paybtn{display:block;width:100%;border:0;background:var(--b);color:#fff;font-size:16px;font-weight:700;padding:13px;border-radius:12px;cursor:pointer}
.paybtn:disabled{opacity:.6}
.ghost{display:block;width:100%;border:0;background:none;color:var(--b);font-size:14px;padding:10px;margin-top:4px;cursor:pointer}
.mini{flex:none;border:0;background:#e8f0ff;color:var(--b);font-weight:700;font-size:12px;padding:8px 10px;border-radius:8px;cursor:pointer}
.mnote{font-size:12px;opacity:.7;margin:0 0 10px}.err{color:#c62828;font-size:13px;margin:6px 0;min-height:1em}
.mod{position:fixed;inset:0;background:#0008;display:flex;align-items:center;justify-content:center;padding:18px;z-index:50}
.mbox{background:#fff;border-radius:16px;padding:18px;width:100%;max-width:380px}
.mbox h3{margin:0 0 8px}.mbox p{font-size:14px;line-height:1.45}
.mbox input{width:100%;font-size:18px;letter-spacing:2px;padding:12px;border:1px solid #c5d0e6;border-radius:10px;text-align:center}

/* ---- custom video player (vplayer.js) ---- */
.vp{--a:#4d8bf0;position:relative;background:#000;color:#fff;display:flex;flex-direction:column;overflow:hidden;-webkit-user-select:none;user-select:none;touch-action:manipulation;font-family:inherit}
.vp-view{position:relative;aspect-ratio:16/9;background:#000;overflow:hidden;flex:none}
.vp-mount,.vp-mount iframe,.vp-mount video{position:absolute;inset:0;width:100%;height:100%;border:0;background:#000;display:block}
.vp-mount iframe{pointer-events:none}
.vp-err{display:flex;align-items:center;justify-content:center;text-align:center;padding:12px;font-size:14px}
.vp-shield{position:absolute;inset:0;z-index:2;cursor:pointer;-webkit-tap-highlight-color:transparent}
.vp-zone{position:absolute;top:0;bottom:0;width:32%;z-index:3;cursor:pointer;-webkit-tap-highlight-color:transparent}
.vp-zl{left:0}.vp-zr{right:0}
.vp-big{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);width:64px;height:64px;border-radius:50%;background:#000a;border:2px solid #fff4;display:flex;align-items:center;justify-content:center;z-index:3;pointer-events:none}
.vp-big svg{width:30px;height:30px;margin-left:3px}
/* double-tap feedback */
.vp-skip{position:absolute;top:50%;transform:translateY(-50%);z-index:6;width:120px;height:120px;border-radius:50%;background:#ffffff30;display:none;flex-direction:column;align-items:center;justify-content:center;font-size:13px;font-weight:700;pointer-events:none}
.vp-skl{left:6%}.vp-skr{right:6%}
.vp-skip.on{display:flex;animation:vpk .7s ease-out}
.vp-skip svg{width:26px;height:26px}
@keyframes vpk{0%{opacity:0;transform:translateY(-50%) scale(.7)}25%{opacity:1;transform:translateY(-50%) scale(1)}80%{opacity:1}100%{opacity:0}}
/* invisible blockers over YouTube's own title/channel/share (while paused and for the first seconds) */
.vp-band{display:none;position:absolute;left:0;right:0;background:transparent;z-index:4}
.vp-top{top:0;height:31%}
.vp-bot{bottom:0;height:25%}
.vp-yt.vp-paused .vp-shield{pointer-events:none}
.vp-yt.vp-paused .vp-band,.vp-yt.vp-intro .vp-top{display:block}
.vp-hint{display:none;position:absolute;left:50%;bottom:28%;transform:translateX(-50%);z-index:6;background:#000d;color:#fff;font-size:13px;padding:8px 14px;border-radius:20px;pointer-events:none;white-space:nowrap;border:1px solid #fff3}
/* controls */
.vp-bar{background:linear-gradient(#10151f,#0a0d14);padding:6px 10px 8px;flex:none}
.vp-r1{display:flex;align-items:center;gap:8px}
.vp-tc{font-size:12px;font-variant-numeric:tabular-nums;opacity:.85;min-width:34px;text-align:center}
.vp-r2{display:flex;align-items:center;gap:4px;margin-top:2px}
.vp-sp{flex:1}
.vp-b{flex:none;min-width:40px;height:40px;border:0;background:none;color:#fff;border-radius:50%;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;padding:0}
.vp-b svg{width:22px;height:22px}
.vp-b:active{background:#fff3}
.vp-play{background:var(--a);width:44px;height:44px;box-shadow:0 2px 10px #4d8bf055}
.vp-play:active{background:#3f78d6}
.vp-play svg{width:24px;height:24px}
.vp-pill{border-radius:16px;height:30px;min-width:52px;padding:0 12px;font-size:13px;font-weight:700;background:#ffffff1c;margin-right:2px}
.vp-seek{-webkit-appearance:none;appearance:none;flex:1;min-width:0;height:24px;margin:0;background:transparent;cursor:pointer;--p:0%}
.vp-seek::-webkit-slider-runnable-track{height:4px;border-radius:4px;background:linear-gradient(to right,var(--a) var(--p),#ffffff33 var(--p))}
.vp-seek::-webkit-slider-thumb{-webkit-appearance:none;width:14px;height:14px;border-radius:50%;background:#fff;margin-top:-5px;box-shadow:0 0 0 4px #4d8bf055}
.vp-seek::-moz-range-track{height:4px;border-radius:4px;background:#ffffff33}
.vp-seek::-moz-range-progress{height:4px;border-radius:4px;background:var(--a)}
.vp-seek::-moz-range-thumb{width:14px;height:14px;border:0;border-radius:50%;background:#fff}
.vp-menu{position:absolute;right:10px;bottom:92px;z-index:8;max-height:60%;overflow:auto;background:#0b0f18f2;border:1px solid #ffffff22;border-radius:14px;padding:6px;min-width:150px;box-shadow:0 8px 24px #0008}
.vp-mh{font-size:11px;letter-spacing:1px;text-transform:uppercase;opacity:.6;padding:6px 12px 4px}
.vp-menu button{display:block;width:100%;border:0;background:none;color:#fff;text-align:left;padding:10px 12px;font-size:14px;border-radius:9px;cursor:pointer}
.vp-menu button.on{background:var(--a);font-weight:700}
.vp:fullscreen{width:100vw;height:100vh;margin:0!important;border-radius:0!important;box-shadow:none!important}
.vp:-webkit-full-screen{width:100vw;height:100vh;margin:0!important;border-radius:0!important}
.vp:fullscreen .vp-view,.vp:-webkit-full-screen .vp-view,.vp.fs .vp-view{flex:1;aspect-ratio:auto;min-height:0}
.vp.fs{position:fixed;inset:0;z-index:200;width:100%;height:100%;margin:0!important;border-radius:0!important;box-shadow:none!important}
.vp.fs .vp-menu,.vp:fullscreen .vp-menu{bottom:84px}
@media (orientation:landscape) and (max-height:520px){.vp:not(.fs):not(:fullscreen) .vp-view{aspect-ratio:auto;height:calc(100vh - 100px)}}
/* watching a class: hide the course title bar and the tabs */
.watch .bar,.watch .tabs{display:none}

/* footer only on the main tabs (Home / Downloads / Help); hidden inside any other page */
.nonav nav{display:none}
.nonav #app{padding-bottom:16px}
/* offline: only Downloads */
.offline nav,.offline #menu,.offline .bell{display:none}
.offbar{background:#fff3d6;color:#6b4a00;text-align:center;font-size:13px;font-weight:600;padding:8px 12px}
/* downloads */
.dli{display:flex;align-items:center;gap:12px;background:#fff;margin:8px 14px;padding:12px;border-radius:14px;box-shadow:0 1px 5px #0001}
.dli .ic2{flex:none;width:44px;height:44px;border-radius:12px;background:#ffe9e7;display:flex;align-items:center;justify-content:center;font-size:22px}
.dli .tx{flex:1;min-width:0;cursor:pointer}
.dli .tx b{display:block;font-size:14px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.dli .tx small{display:block;opacity:.65;font-size:12px;margin-top:2px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.dli .rm{flex:none;border:0;background:#fdecea;color:#c0392b;width:38px;height:38px;border-radius:10px;font-size:17px;cursor:pointer}
.dlnote{margin:6px 14px 0;font-size:12px;opacity:.6}
button.dl{border:0;cursor:pointer;font-family:inherit}

/* ---- notification bell + panel ---- */
header .bell{position:relative;width:42px;height:42px;display:flex;align-items:center;justify-content:center;border-radius:50%;padding:0;font-size:22px;line-height:1;cursor:pointer;-webkit-tap-highlight-color:transparent;transition:background .15s,transform .1s}
header .bell:active{background:#e8effb;transform:scale(.92)}
header .bell i{position:absolute;top:3px;right:2px;min-width:18px;height:18px;padding:0 5px;border-radius:9px;background:#e53935;color:#fff;font:700 11px/18px system-ui,sans-serif;text-align:center;font-style:normal;box-shadow:0 0 0 2px #fff}
header .bell i[hidden]{display:none}
.ntw{position:fixed;inset:0;z-index:50;background:#0a1a3a77;display:flex;justify-content:center;align-items:flex-start;animation:lgfade .2s}
.ntw[hidden]{display:none}
.ntp{width:100%;max-width:480px;max-height:82vh;background:#fff;border-radius:0 0 22px 22px;display:flex;flex-direction:column;overflow:hidden;box-shadow:0 12px 36px #0004;animation:ntdn .25s cubic-bezier(.2,.8,.2,1)}
@keyframes ntdn{from{transform:translateY(-30px);opacity:0}to{transform:none;opacity:1}}
.nth{display:flex;align-items:center;gap:8px;padding:14px 14px 10px;border-bottom:1px solid #e6ecf6}
.nth h3{margin:0;flex:1;font-size:18px;color:#16233b}
.nth button{border:0;background:#f1f3f4;color:#555;border-radius:18px;padding:7px 12px;font-size:13px;cursor:pointer}
.nth #ntall{background:#e8effb;color:#1a4fa3;font-weight:600}
.nth #ntall[hidden]{display:none}
.nth #ntx{width:34px;height:34px;padding:0;border-radius:50%}
#ntl{overflow-y:auto;padding:6px 0 10px}
.nti{display:flex;gap:10px;padding:12px 14px;cursor:pointer;border-bottom:1px solid #f0f3f9}
.nti.un{background:#f1f6ff}
.ntd{width:9px;height:9px;border-radius:50%;margin-top:6px;flex:none;background:transparent}
.nti.un .ntd{background:#1a4fa3}
.ntb b{display:block;font-size:15px;color:#16233b}
.ntb p{margin:3px 0 4px;font-size:14px;line-height:1.45;color:#3b4a66;white-space:pre-line}
.ntb small{font-size:12px;opacity:.55}
.nte{text-align:center;padding:36px 20px;opacity:.6;font-size:15px}
.nte div{font-size:34px;margin-bottom:6px}