:root{--pri:#5B3FD6;--pri-d:#4228B8;--pri-l:#EEE9FC;--pri-xl:#F6F3FE;--ink:#1D1A33;--muted:#6F6B8A;--line:#E8E4F6;--bg:#F5F3FC;--pink:#EF6A7B;--orange:#F5A524;--green:#3FAE7A;--card:#fff;--r:16px}
*{box-sizing:border-box}
body{font-family:'Poppins',system-ui,sans-serif;color:var(--ink);background:#fff;font-size:15px;line-height:1.6}
h1,h2,h3,h4,.serif{font-family:'Playfair Display',Georgia,serif;font-weight:600;letter-spacing:-.01em}
a{color:var(--pri)}a:hover{color:var(--pri-d)}
.text-muted{color:var(--muted)!important}
.btn{border-radius:10px;font-weight:500;padding:.55rem 1.2rem}
.btn-primary{background:var(--pri);border-color:var(--pri)}.btn-primary:hover,.btn-primary:focus{background:var(--pri-d);border-color:var(--pri-d)}
.btn-outline-primary{color:var(--pri);border-color:var(--pri)}.btn-outline-primary:hover{background:var(--pri);border-color:var(--pri)}
.btn-light{background:var(--pri-xl);border-color:var(--pri-xl);color:var(--pri)}
.btn-lg{padding:.75rem 1.6rem}
.form-control{border-radius:10px;border-color:var(--line);padding:.6rem .9rem;height:auto}
.form-control:focus{border-color:var(--pri);box-shadow:0 0 0 .2rem rgba(91,63,214,.15)}
label{font-weight:500;font-size:.9rem}
:focus-visible{outline:2px solid var(--pri);outline-offset:2px}
.alert{border-radius:12px;border:0}

/* nav */
.site-nav{background:rgba(255,255,255,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50;padding:.7rem 0}
.brand{display:flex;align-items:center;gap:.55rem;font-family:'Playfair Display',serif;font-weight:700;font-size:1.35rem;color:var(--ink);text-decoration:none}
.brand:hover{color:var(--ink);text-decoration:none}
.brand-mark{width:34px;height:34px;border-radius:10px;background:var(--pri);color:#fff;display:inline-flex;align-items:center;justify-content:center;font-size:1rem}
.site-nav .nav-link{color:var(--ink);font-weight:500;font-size:.9rem;padding:.5rem 1rem}
.site-nav .nav-link:hover{color:var(--pri)}
.nav-search{position:relative;margin:0 .5rem}
.nav-search i{position:absolute;left:12px;top:50%;transform:translateY(-50%);color:var(--muted)}
.nav-search input{border:1px solid var(--line);background:var(--pri-xl);border-radius:10px;padding:.5rem .8rem .5rem 2.2rem;font-size:.88rem;width:220px}
.avatar{border-radius:50%;object-fit:cover;display:inline-block;flex:none}
.avatar-ph{background:var(--pri-l);color:var(--pri);font-weight:600;display:inline-flex;align-items:center;justify-content:center}

/* hero */
.hero{background:linear-gradient(180deg,var(--bg),#fff);padding:4.5rem 0 3rem;overflow:hidden}
.hero h1{font-size:clamp(2.6rem,6vw,4.2rem);line-height:1.05;margin:0 0 1.2rem}
.hero h1 .acc{color:var(--pri);display:block}
.hero p.lead{color:var(--muted);max-width:30rem;font-size:1.02rem}
.hero-search{display:flex;background:#fff;border:1px solid var(--line);border-radius:14px;padding:.4rem;max-width:30rem;box-shadow:0 10px 30px rgba(91,63,214,.08)}
.hero-search input{border:0;flex:1;padding:.5rem .9rem;outline:0;background:transparent;min-width:0}
.hero-visual{position:relative;min-height:380px}
.hero-panel{position:absolute;right:0;top:0;width:78%;height:370px;border-radius:26px;background:linear-gradient(145deg,#6E52E8,#3A2398);overflow:hidden}
.hero-panel img{width:100%;height:100%;object-fit:cover}
.hero-panel .ring{position:absolute;border-radius:50%;border:2px solid rgba(255,255,255,.18)}
.float-card{position:absolute;background:#fff;border-radius:16px;padding:.8rem 1rem;box-shadow:0 18px 40px rgba(29,26,51,.14);display:flex;gap:.7rem;align-items:center;max-width:270px;text-decoration:none;color:var(--ink)}
.float-card:hover{color:var(--ink);text-decoration:none}
.float-card .fc-t{font-weight:600;font-size:.86rem;line-height:1.25}.float-card small{color:var(--muted)}
.float-1{left:0;bottom:70px}.float-2{right:-6px;top:34px}
.trust{display:flex;align-items:center;gap:.7rem;margin-top:1.6rem;color:var(--muted);font-size:.85rem}
.trust .avatar{margin-left:-10px;border:2px solid #fff}.trust .avatar:first-child{margin-left:0}

.feat-strip{border-bottom:1px solid var(--line);padding:1.4rem 0;background:#fff}
.feat{display:flex;gap:.8rem;align-items:center}
.feat i{width:42px;height:42px;border-radius:12px;background:var(--pri-l);color:var(--pri);display:flex;align-items:center;justify-content:center;font-size:1.15rem;flex:none}
.feat b{display:block;font-size:.88rem;line-height:1.2}.feat small{color:var(--muted);font-size:.78rem}

.sec{padding:3.2rem 0}
.sec-h{display:flex;justify-content:space-between;align-items:end;margin-bottom:1.4rem;flex-wrap:wrap;gap:.8rem}
.sec-h h2{font-size:1.8rem;margin:0}
.pill-tabs{display:inline-flex;background:var(--pri-xl);border-radius:12px;padding:4px}
.pill-tabs button{border:0;background:transparent;padding:.4rem 1rem;border-radius:9px;font-size:.85rem;font-weight:500;color:var(--muted);cursor:pointer}
.pill-tabs button.on{background:#fff;color:var(--pri);box-shadow:0 2px 8px rgba(91,63,214,.12)}

/* course card */
.c-card{background:#fff;border:1px solid var(--line);border-radius:var(--r);overflow:hidden;display:flex;flex-direction:column;height:100%;transition:box-shadow .2s,transform .2s;text-decoration:none!important;color:var(--ink)!important}
.c-card:hover{box-shadow:0 16px 36px rgba(91,63,214,.14);transform:translateY(-3px)}
.c-thumb{position:relative;aspect-ratio:16/10;background:var(--pri-l);overflow:hidden}
.c-thumb img{width:100%;height:100%;object-fit:cover}
.c-thumb-ph{display:flex;align-items:flex-end;padding:1rem;color:#fff;font-family:'Playfair Display',serif;font-weight:600;font-size:1.15rem;line-height:1.2}
.c-badge{position:absolute;left:10px;top:10px;font-size:.7rem;font-weight:600;padding:.2rem .65rem;border-radius:20px;background:var(--pink);color:#fff}
.c-badge.free{background:var(--green)}
.c-body{padding:1rem 1.1rem 1.1rem;display:flex;flex-direction:column;flex:1}
.c-cat{font-size:.74rem;color:var(--pri);font-weight:500}
.c-title{font-family:'Playfair Display',serif;font-weight:600;font-size:1.05rem;line-height:1.3;margin:.2rem 0 .35rem}
.c-desc{font-size:.82rem;color:var(--muted);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;margin-bottom:.7rem}
.c-meta{font-size:.78rem;color:var(--muted);display:flex;gap:.9rem;margin-bottom:.8rem}
.c-foot{margin-top:auto;display:flex;justify-content:space-between;align-items:center;border-top:1px solid var(--line);padding-top:.7rem}
.c-inst{display:flex;align-items:center;gap:.5rem;font-size:.8rem}
.c-price{font-weight:600;font-size:1rem}.c-price s{font-weight:400;color:var(--muted);font-size:.8rem;margin-left:.3rem}
.c-price.free{color:var(--green)}

.cat-tile{display:block;background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:1.2rem .8rem;text-align:center;text-decoration:none!important;color:var(--ink)!important;transition:.2s;height:100%}
.cat-tile:hover{box-shadow:0 12px 28px rgba(91,63,214,.12);transform:translateY(-2px)}
.cat-tile i{width:48px;height:48px;border-radius:14px;display:inline-flex;align-items:center;justify-content:center;font-size:1.35rem;margin-bottom:.5rem}
.cat-tile b{display:block;font-size:.88rem}.cat-tile small{color:var(--muted);font-size:.76rem}

.inst-card{text-align:center;background:#fff;border:1px solid var(--line);border-radius:var(--r);overflow:hidden;height:100%}
.inst-card .ph{aspect-ratio:1/1;background:var(--pri-l);display:flex;align-items:center;justify-content:center;font-size:3rem;color:var(--pri);font-family:'Playfair Display',serif}
.inst-card .ph img{width:100%;height:100%;object-fit:cover}
.inst-card .b{padding:.9rem}.inst-card b{display:block}.inst-card small{color:var(--muted)}

.cta-band{background:linear-gradient(110deg,#4A30C4,#7B5CF0);border-radius:22px;color:#fff;padding:2.4rem;display:flex;gap:2rem;align-items:center;flex-wrap:wrap;justify-content:space-between}
.cta-band h3{font-size:1.7rem;margin:0 0 .3rem}.cta-band .st b{font-family:'Playfair Display',serif;font-size:2rem;display:block;line-height:1}.cta-band .st small{opacity:.8}
.cta-band .btn{background:#fff;color:var(--pri);border:0}
.logo-row{display:flex;flex-wrap:wrap;gap:1.6rem;align-items:center;justify-content:center}
.logo-row img{max-height:46px;max-width:140px;object-fit:contain;filter:grayscale(1);opacity:.75;transition:.2s}.logo-row img:hover{filter:none;opacity:1}
.site-footer{border-top:1px solid var(--line);padding:1.6rem 0;margin-top:3rem;background:var(--pri-xl)}

/* detail */
.d-hero{background:linear-gradient(180deg,var(--bg),#fff);padding:2.6rem 0 1.5rem}
.d-hero h1{font-size:clamp(1.9rem,4vw,2.7rem);line-height:1.15}
.crumb{font-size:.82rem;color:var(--muted)}.crumb a{color:var(--muted)}
.buy-card{background:#fff;border:1px solid var(--line);border-radius:20px;box-shadow:0 18px 44px rgba(91,63,214,.12);overflow:hidden;position:sticky;top:90px}
.buy-card .c-thumb{border-radius:0}
.buy-card .in{padding:1.3rem}
.buy-price{font-family:'Playfair Display',serif;font-size:2rem;font-weight:700}.buy-price s{font-size:1rem;color:var(--muted);font-weight:400;margin-left:.4rem}
.inc li{list-style:none;font-size:.86rem;padding:.25rem 0;color:var(--muted)}.inc i{color:var(--pri);margin-right:.5rem}.inc{padding:0;margin:1rem 0 0}
.d-tabs{border-bottom:1px solid var(--line);display:flex;gap:1.4rem;margin:1.6rem 0;overflow-x:auto;position:sticky;top:62px;background:#fff;z-index:5}
.d-tabs a{padding:.8rem 0;color:var(--muted);font-weight:500;font-size:.9rem;white-space:nowrap;text-decoration:none;border-bottom:2px solid transparent}
.d-tabs a:hover,.d-tabs a.on{color:var(--pri);border-color:var(--pri)}
.learn-list{padding:0;list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:.4rem 1.4rem}.learn-list li{font-size:.9rem}.learn-list i{color:var(--green);margin-right:.5rem}
@media(max-width:767px){.learn-list{grid-template-columns:1fr}}
.acc-sec{border:1px solid var(--line);border-radius:14px;margin-bottom:.7rem;overflow:hidden}
.acc-sec>button{width:100%;text-align:left;background:var(--pri-xl);border:0;padding:.85rem 1.1rem;font-weight:600;display:flex;justify-content:space-between;align-items:center;cursor:pointer}
.acc-sec .l{display:flex;justify-content:space-between;gap:1rem;padding:.6rem 1.1rem;border-top:1px solid var(--line);font-size:.88rem}
.acc-sec .l i{color:var(--pri);margin-right:.55rem}
.team-card{display:flex;gap:1rem;background:#fff;border:1px solid var(--line);border-radius:16px;padding:1rem;height:100%}
.team-card b{display:block}.team-card .t{color:var(--pri);font-size:.82rem}.team-card p{font-size:.84rem;color:var(--muted);margin:.4rem 0 0}
.collab-box{border:1px dashed var(--line);border-radius:16px;padding:1.2rem;background:var(--pri-xl)}
.collab-box h6{font-family:'Poppins';font-weight:600;font-size:.82rem;color:var(--muted);margin-bottom:.9rem}
.collab-box a,.collab-box span.i{display:flex;flex-direction:column;align-items:center;gap:.4rem;text-decoration:none;color:var(--ink);font-size:.78rem;text-align:center;max-width:130px}
.collab-box img{height:52px;max-width:130px;object-fit:contain;background:#fff;border-radius:10px;padding:6px}

/* auth */
.auth-body{background:linear-gradient(160deg,var(--bg),#fff 60%);min-height:100vh}
.auth-wrap{max-width:440px;margin:0 auto;padding:3rem 1rem}
.auth-card{background:#fff;border:1px solid var(--line);border-radius:22px;padding:2rem;box-shadow:0 20px 50px rgba(91,63,214,.1)}
.auth-card h1{font-size:1.7rem;margin-bottom:.3rem}

/* panels / student */
.panel{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:1.4rem}
.progress{height:8px;border-radius:8px;background:var(--pri-l)}.progress-bar{background:var(--pri);border-radius:8px}
.my-card{display:flex;gap:1rem;background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:.9rem;align-items:center;margin-bottom:.9rem}
.my-card .c-thumb{width:150px;border-radius:12px;flex:none}
@media(max-width:575px){.my-card{flex-direction:column;align-items:stretch}.my-card .c-thumb{width:100%}}

/* learn player */
.learn-body{background:var(--bg);min-height:100vh}
.learn-top{position:sticky;top:0;z-index:20;background:#fff;border-bottom:1px solid var(--line);padding:.6rem 1rem;display:flex;gap:1rem;align-items:center}
.learn-title{font-family:'Playfair Display',serif;font-weight:600;font-size:1.05rem;flex:1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.learn-prog{align-items:center;gap:.6rem;width:220px}.learn-prog .progress{flex:1}
.player{display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:1.2rem;padding:0 1rem 2rem;max-width:1500px;margin:0 auto}
@media(max-width:991px){.player{grid-template-columns:1fr}.p-side{order:2}}
.stage{background:#fff;border:1px solid var(--line);border-radius:var(--r);overflow:hidden}
.stage .media{background:#0f0c1f;position:relative}
.ratio16{position:relative;padding-top:56.25%}.ratio16>iframe,.ratio16>video{position:absolute;inset:0;width:100%;height:100%;border:0}
.ppt-frame{height:70vh;min-height:380px}.ppt-frame iframe{width:100%;height:100%;border:0}
.stage img.full{max-width:100%;display:block;margin:0 auto}
.rich{padding:1.4rem 1.6rem;line-height:1.75}.rich img{max-width:100%;height:auto}.rich iframe{max-width:100%}
.stage .head{padding:1.1rem 1.4rem;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap;align-items:center}
.p-side{background:#fff;border:1px solid var(--line);border-radius:var(--r);align-self:start;position:sticky;top:70px;max-height:calc(100vh - 90px);overflow:auto}
.p-side .sh{padding:.8rem 1rem;font-weight:600;background:var(--pri-xl);font-size:.88rem;position:sticky;top:0}
.p-item{display:flex;gap:.7rem;padding:.6rem 1rem;font-size:.86rem;text-decoration:none!important;color:var(--ink)!important;border-top:1px solid var(--line);align-items:flex-start}
.p-item:hover{background:var(--pri-xl)}.p-item.on{background:var(--pri-l);font-weight:500}
.p-item .ck{color:var(--line);font-size:1.05rem;margin-top:1px}.p-item.done .ck{color:var(--green)}
.p-item small{display:block;color:var(--muted)}
.p-quiz{margin:.8rem;padding:.8rem;border-radius:12px;border:1px solid var(--line);font-size:.85rem}
.file-chip{display:flex;align-items:center;gap:.7rem;border:1px solid var(--line);border-radius:12px;padding:.6rem .9rem;text-decoration:none!important;color:var(--ink)!important;margin-bottom:.5rem;font-size:.88rem}
.file-chip:hover{background:var(--pri-xl)}.file-chip i{font-size:1.3rem;color:var(--pri)}

/* quiz */
.quiz-wrap{max-width:820px;margin:1rem auto 3rem;padding:0 1rem}
.q-card{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:1.3rem;margin-bottom:1rem}
.q-opt{display:flex;gap:.7rem;align-items:flex-start;border:1px solid var(--line);border-radius:12px;padding:.65rem .9rem;margin-top:.5rem;cursor:pointer;font-size:.92rem;font-weight:400}
.q-opt:hover{background:var(--pri-xl)}.q-opt input{margin-top:.35rem}
.q-opt.ok{border-color:var(--green);background:#EAF7F0}.q-opt.bad{border-color:var(--pink);background:#FDECEE}
.timer{position:sticky;top:60px;z-index:10;background:#1D1A33;color:#fff;border-radius:12px;padding:.5rem 1rem;display:inline-flex;gap:.5rem;align-items:center;font-variant-numeric:tabular-nums}
.score-ring{width:150px;height:150px;border-radius:50%;display:flex;align-items:center;justify-content:center;flex-direction:column;margin:0 auto 1rem;border:10px solid var(--pri-l)}
.score-ring b{font-family:'Playfair Display',serif;font-size:2.6rem;line-height:1}

.form-help{font-size:.78rem;color:var(--muted)}
.pagination .page-link{border-radius:8px;margin:0 2px;color:var(--pri)}.pagination .active .page-link{background:var(--pri);border-color:var(--pri);color:#fff}
.tag{display:inline-block;font-size:.72rem;font-weight:600;padding:.15rem .6rem;border-radius:20px;background:var(--pri-l);color:var(--pri)}
.filter-bar{display:flex;gap:.6rem;flex-wrap:wrap;margin-bottom:1.4rem}
.chip{padding:.4rem 1rem;border-radius:20px;border:1px solid var(--line);font-size:.84rem;color:var(--ink);text-decoration:none!important;background:#fff}
.chip.on{background:var(--pri);border-color:var(--pri);color:#fff}
@media (prefers-reduced-motion:reduce){*{transition:none!important}}
@media(max-width:991px){.hero-visual{min-height:420px;margin-top:2rem}.nav-search input{width:100%}.nav-search{margin:.6rem 0}.buy-card{position:static}}

/* komentar & diskusi */
.cm{display:flex;gap:.7rem;margin-bottom:.9rem}.cm-reply{margin:.7rem 0 0 0;padding-left:.8rem;border-left:2px solid var(--line)}
.cm .tag{font-size:.65rem}