/* ============ App សិស្ស (Telegram Mini App / Android / iOS) ============ */
body.app{background:#f3f6f4;padding-bottom:calc(72px + env(safe-area-inset-bottom));font-size:15.5px;-webkit-tap-highlight-color:transparent}
body.app.no-tabs{padding-bottom:calc(84px + env(safe-area-inset-bottom))}
body.app.bare{padding-bottom:0;background:#fff}
.app main{max-width:640px;margin:0 auto;width:100%}
.app .wrap{padding:0 16px}
.app .pad{padding-top:16px;padding-bottom:16px}
.app h1{font-size:1.3rem}
.app h2{font-size:1.08rem;margin:22px 0 10px}
.app .flash{margin:12px 16px 0}

/* header */
.abar{position:sticky;top:0;z-index:30;background:#fff;border-bottom:1px solid #e6ece8;height:56px;display:flex;align-items:center;gap:8px;padding:0 10px 0 6px;padding-top:env(safe-area-inset-top);box-sizing:content-box}
.abar-logo{height:36px;width:auto;margin-left:8px}
.abar h1{font-size:1.02rem;margin:0;flex:1;min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.abar-back{width:40px;height:40px;border-radius:50%;display:grid;place-items:center;color:var(--ink);text-decoration:none!important;flex:none}
.abar-back:active{background:#eef3f0}
.abar-right{margin-left:auto;display:flex;gap:6px;align-items:center}
.abar .av{width:34px;height:34px;font-size:.85rem;box-shadow:none}
.abar-ic{width:38px;height:38px;border-radius:50%;display:grid;place-items:center;color:var(--ink);position:relative;text-decoration:none!important}
.abar-ic .dot{position:absolute;top:7px;right:8px;width:8px;height:8px;border-radius:50%;background:#e8613c;box-shadow:0 0 0 2px #fff}
.av{flex:none;width:38px;height:38px;border-radius:50%;display:grid;place-items:center;background:var(--av,#047d5d);color:#fff;font-weight:700}
.ic{flex:none;display:inline-block;vertical-align:middle}

/* tab bar */
.atabs{position:fixed;left:0;right:0;bottom:0;z-index:40;background:#fff;border-top:1px solid #e6ece8;display:grid;grid-template-columns:repeat(5,1fr);padding-bottom:env(safe-area-inset-bottom)}
.atabs a{display:flex;flex-direction:column;align-items:center;gap:2px;padding:8px 2px 7px;color:#7a8a84;font-size:.68rem;font-weight:500;text-decoration:none!important;line-height:1.35;position:relative}
.atabs a.on{color:var(--brand);font-weight:700}
.atabs a.on:before{content:"";position:absolute;top:0;left:30%;right:30%;height:3px;border-radius:0 0 3px 3px;background:var(--brand)}
.atabs .ic{width:23px;height:23px}

/* sticky action bar (course / lesson) */
.abottom{position:fixed;left:0;right:0;bottom:0;z-index:40;background:#fff;border-top:1px solid #e6ece8;padding:10px 16px calc(10px + env(safe-area-inset-bottom));display:flex;gap:10px;align-items:center}
.abottom>*{max-width:640px}
.abottom .btn{flex:1;padding:12px 14px;font-size:1rem;border-radius:12px}
.abottom .btn-ghost{flex:none}
.abottom .price{font-size:1.25rem;flex:none}
.abottom form{flex:1;display:flex}
.abottom form .btn{width:100%}

/* blocks */
.sec{padding:0 16px;margin-top:20px}
.sec-h{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:10px}
.sec-h h2{margin:0;font-size:1.05rem}
.sec-h a{font-size:.88rem;font-weight:600}
.box{background:#fff;border-radius:16px;padding:16px;box-shadow:0 1px 2px rgba(16,40,30,.05);border:1px solid #e9efeb}
.hello{padding:18px 16px 4px}
.hello h1{font-size:1.25rem;margin:0}
.hello p{margin:2px 0 0;color:var(--muted);font-size:.92rem}

.resume{margin:14px 16px 0;border-radius:20px;padding:18px;color:#fff;background:linear-gradient(135deg,#06946e 0%,#047d5d 55%,#035a43 100%);position:relative;overflow:hidden;box-shadow:0 10px 24px rgba(4,125,93,.25)}
.resume:after{content:"";position:absolute;right:-30px;top:-30px;width:140px;height:140px;border-radius:50%;background:rgba(245,162,31,.25)}
.resume small{opacity:.85;font-size:.8rem;display:block}
.resume h3{color:#fff;margin:2px 0 4px;font-size:1.1rem;position:relative;z-index:1}
.resume .les{font-size:.88rem;opacity:.95;position:relative;z-index:1}
.resume .progress{background:rgba(255,255,255,.25);margin:12px 0 6px}
.resume .progress i{background:var(--accent)}
.resume .row{display:flex;justify-content:space-between;align-items:center;gap:10px;position:relative;z-index:1}
.resume .btn{background:#fff;color:var(--brand);border-color:#fff;border-radius:12px}

.stat3{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:14px 16px 0}
.stat3 div{background:#fff;border:1px solid #e9efeb;border-radius:14px;padding:12px 10px;text-align:center}
.stat3 b{display:block;font-size:1.35rem;color:var(--brand);line-height:1.3}
.stat3 span{font-size:.75rem;color:var(--muted)}

.hscroll{display:flex;gap:12px;overflow-x:auto;padding:2px 16px 8px;margin:0 -16px;scroll-snap-type:x mandatory;scrollbar-width:none}
.hscroll::-webkit-scrollbar{display:none}
.hscroll>*{scroll-snap-align:start;flex:none}
.chips{display:flex;gap:8px;overflow-x:auto;padding:2px 16px 6px;margin:0 -16px;scrollbar-width:none}
.chips::-webkit-scrollbar{display:none}
.chips a{flex:none;background:#fff;border:1px solid #dfe7e2;border-radius:999px;padding:6px 14px;font-size:.86rem;color:var(--ink);font-weight:500;text-decoration:none!important;white-space:nowrap}
.chips a.on{background:var(--brand);color:#fff;border-color:var(--brand)}

.ccard{width:220px;background:#fff;border-radius:16px;overflow:hidden;border:1px solid #e9efeb;color:var(--ink)!important;text-decoration:none!important;display:flex;flex-direction:column}
.ccard .thumb{aspect-ratio:16/10}
.ccard .b{padding:10px 12px 12px;display:flex;flex-direction:column;gap:4px;flex:1}
.ccard h3{font-size:.95rem;margin:0;line-height:1.45}
.ccard .f{display:flex;justify-content:space-between;align-items:center;margin-top:auto;font-size:.8rem;color:var(--muted)}
.ccard .price{font-size:1rem}

.crow{display:flex;gap:12px;align-items:center;background:#fff;border-radius:16px;padding:10px;border:1px solid #e9efeb;color:var(--ink)!important;text-decoration:none!important;margin-bottom:10px}
.crow .thumb{width:92px;flex:none;aspect-ratio:1/1;border-radius:12px}
.crow .thumb-letter{font-size:1.8rem}
.crow .b{flex:1;min-width:0}
.crow h3{font-size:.96rem;margin:0 0 2px;line-height:1.45}
.crow .m{font-size:.8rem;color:var(--muted)}
.crow .price{font-size:.98rem}
.crow .progress{margin:6px 0 2px;height:6px}
.lvl{display:inline-block;font-size:.7rem;font-weight:600;background:#e8f4ef;color:var(--brand);padding:1px 8px;border-radius:99px}

.search-bar{position:sticky;top:57px;z-index:20;background:#f3f6f4;padding:12px 16px 8px}
.search-bar form{display:flex;gap:8px;position:relative}
.search-bar input{border-radius:12px;padding-left:40px;background:#fff}
.search-bar .ic{position:absolute;left:13px;top:50%;transform:translateY(-50%);color:var(--muted)}

/* course detail */
.c-hero{position:relative}
.c-hero .thumb{aspect-ratio:16/9;border-radius:0}
.c-head{background:#fff;padding:16px;border-bottom:1px solid #e9efeb}
.c-head h1{margin:6px 0 6px;font-size:1.22rem}
.c-head p{color:var(--muted);margin:0 0 10px;font-size:.93rem}
.metas{display:flex;flex-wrap:wrap;gap:6px}
.metas span{display:inline-flex;align-items:center;gap:5px;font-size:.8rem;background:#f1f5f3;border-radius:99px;padding:3px 10px;color:var(--ink)}
.perks{display:grid;gap:8px;margin:0;padding:0;list-style:none}
.perks li{display:flex;gap:10px;align-items:flex-start;font-size:.9rem}
.perks li .ic{color:var(--brand);margin-top:3px}
.app .acc{border-radius:14px;border-color:#e9efeb}
.app .lesson-list li{align-items:center}
.app .lesson-list a{color:var(--ink);font-weight:500}
.more-txt{max-height:150px;overflow:hidden;position:relative}
.more-txt:after{content:"";position:absolute;left:0;right:0;bottom:0;height:50px;background:linear-gradient(transparent,#fff)}
.more-btn{display:inline-block;color:var(--brand);font-weight:600;font-size:.9rem;cursor:pointer;margin:6px 0 0}
#moreTxt:checked~.more-txt{max-height:none}
#moreTxt:checked~.more-txt:after{display:none}
#moreTxt:checked~.more-btn .lbl-more,#moreTxt:not(:checked)~.more-btn .lbl-less{display:none}

/* lesson */
.l-progress{height:3px;background:#e4ebe7}
.l-progress i{display:block;height:100%;background:var(--accent)}
.app .video{border-radius:0;margin:0}
.l-body{padding:16px}
.l-body h1{font-size:1.18rem;margin:0 0 4px}
.l-meta{font-size:.82rem;color:var(--muted);margin-bottom:12px}
.sheet{position:fixed;inset:0;z-index:60;display:none}
.sheet.open{display:block}
.sheet-bg{position:absolute;inset:0;background:rgba(10,25,20,.45)}
.sheet-in{position:absolute;left:0;right:0;bottom:0;max-height:78vh;overflow-y:auto;background:#fff;border-radius:20px 20px 0 0;padding:8px 16px calc(16px + env(safe-area-inset-bottom))}
.sheet-in:before{content:"";display:block;width:40px;height:4px;border-radius:4px;background:#d6dfda;margin:4px auto 10px}
.sheet .side-list a,.sheet .side-list .locked{padding:9px 6px}

/* login */
.login{min-height:100vh;display:flex;flex-direction:column;background:linear-gradient(180deg,#eef8f3 0%,#fff 55%)}
.login-top{padding:calc(36px + env(safe-area-inset-top)) 24px 10px;text-align:center}
.login-top img{width:min(260px,72vw);height:auto}
.login-top h1{font-size:1.35rem;margin:20px 0 6px}
.login-top p{color:var(--muted);margin:0 auto;max-width:34ch;font-size:.95rem}
.perk3{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin:20px 0 4px}
.perk3 div{background:#fff;border:1px solid #e3ece7;border-radius:14px;padding:10px 6px;font-size:.76rem;line-height:1.45;color:var(--ink)}
.perk3 i{display:block;font-style:normal;font-size:1.3rem;margin-bottom:2px}
.login-card{margin:14px 16px 24px;padding:20px;background:#fff;border-radius:20px;border:1px solid #e3ece7;box-shadow:0 8px 30px rgba(4,125,93,.08)}
.login-card label{margin-bottom:12px}
.login-card input{border-radius:12px;padding:12px 14px}
.login-card .btn{border-radius:12px;padding:13px;font-size:1rem}
.btn-tg{background:#2aabee;border-color:#2aabee;color:#fff}
.btn-tg:hover{background:#229ed9}
.tg-who{display:flex;gap:12px;align-items:center;margin-bottom:12px}
.tg-who img,.tg-who .av{width:46px;height:46px;border-radius:50%;object-fit:cover}
.tg-who b{display:block}
.tg-who small{color:var(--muted)}
.login-foot{text-align:center;font-size:.9rem;margin-top:14px}
.pw{position:relative}
.pw button{position:absolute;right:8px;bottom:8px;border:0;background:none;color:var(--muted);padding:6px;cursor:pointer}

/* profile */
.prof{background:#fff;padding:20px 16px;text-align:center;border-bottom:1px solid #e9efeb}
.prof .av{width:72px;height:72px;font-size:1.8rem;margin:0 auto 8px}
.prof h1{margin:0;font-size:1.2rem}
.prof p{margin:2px 0 0;color:var(--muted);font-size:.88rem}
.menu{background:#fff;border-radius:16px;border:1px solid #e9efeb;overflow:hidden}
.menu a,.menu button,.menu summary{display:flex;align-items:center;gap:12px;padding:14px 16px;border:0;border-bottom:1px solid #eef2f0;background:none;width:100%;font:inherit;color:var(--ink)!important;text-decoration:none!important;cursor:pointer;text-align:left;list-style:none}
.menu summary::-webkit-details-marker{display:none}
.menu>*:last-child,.menu>form:last-child button{border-bottom:0}
.menu .mi{width:34px;height:34px;border-radius:10px;display:grid;place-items:center;flex:none;color:#fff}
.menu .chev{margin-left:auto;color:#a9b6b0}
.menu .val{margin-left:auto;color:var(--muted);font-size:.85rem}
.menu details[open]>summary .chev{transform:rotate(90deg)}
.menu .inner{padding:4px 16px 16px;border-bottom:1px solid #eef2f0}
.menu .danger{color:#c4372b!important}

/* certificates */
.cert-card{background:#fff;border-radius:16px;border:1px solid #e9efeb;padding:14px;margin-bottom:12px;display:flex;gap:12px;align-items:flex-start}
.cert-ic{width:48px;height:48px;border-radius:14px;flex:none;display:grid;place-items:center;background:linear-gradient(135deg,#f5a21f,#e8830c);color:#fff}
.cert-card h3{font-size:.98rem;margin:0}
.cert-card .m{font-size:.8rem;color:var(--muted)}
.cert-card .btn-row{margin-top:10px}

.seg{display:grid;grid-template-columns:1fr 1fr;background:#e6ede9;border-radius:12px;padding:4px;margin:14px 16px 12px}
.seg a{text-align:center;padding:8px;border-radius:9px;font-weight:600;font-size:.9rem;color:var(--muted);text-decoration:none!important}
.seg a.on{background:#fff;color:var(--brand);box-shadow:0 1px 3px rgba(0,0,0,.08)}
.empty-app{text-align:center;padding:36px 20px;color:var(--muted)}
.empty-app .big{font-size:2.6rem;display:block;margin-bottom:6px}
.note-tip{background:#fff8e8;border:1px solid #f8e1b0;color:#6b4a00;border-radius:12px;padding:10px 12px;font-size:.88rem}
.app .panel{border-radius:16px;border-color:#e9efeb}
.app .table-wrap{background:#fff;border-radius:14px}
.app .exam-bar{top:66px}
.app .lesson-nav{display:none}

.more-txt.short:after{display:none}
.more-btn[hidden]{display:none}
/* ក្នុង App ចំណងជើងនៅលើ header រួចហើយ */
.app main>section.wrap>h1:first-child,.app main>section.wrap>a.small:first-child,.app main>section.wrap>a.small:first-child+h1{display:none}
.app main>section.wrap.pad{padding-top:14px}