:root{--gold:#fab23d;--gold-lt:#ffe1af;--grad:linear-gradient(90deg,#fab23d,#ffe1af 50%,#fab23d);--ink:#141414;--ink2:#1b1b1b;--panel:#232323;--panel2:#2b2b2b;--line:#ffffff17;--line2:#ffffff29;--coral:#f04438;--green:#12b76a;--blue:#2686ec;--txt:#ededed;--muted:#a6a6a6;--muted2:#8f8f8f;--f:var(--font-bevn),"Be Vietnam Pro","Segoe UI",system-ui,sans-serif}*{box-sizing:border-box;margin:0;padding:0}body{background:var(--ink);color:var(--txt);font-family:var(--f);-webkit-font-smoothing:antialiased;font-size:15px;line-height:1.55;overflow-x:clip}a{color:inherit;text-decoration:none}img{max-width:100%;display:block}.gold{color:var(--gold)}.wrap{max-width:1440px;margin:0 auto;padding:0 22px}.topbar{border-bottom:1px solid var(--line);color:var(--muted);background:#0d0d0d;font-size:.82rem}.topbar-in{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:14px;min-height:38px;padding:4px 0;display:flex}.topbar b{color:var(--gold-lt)}.topbar a{color:var(--gold-lt);text-underline-offset:2px;text-decoration:underline}.announce{background:var(--grad);color:#2a1c02;text-align:center;text-transform:uppercase;letter-spacing:.02em;padding:9px 16px;font-size:.9rem;font-weight:800}@media (max-width:760px){.topbar-in .tb-contact{display:none}.announce{letter-spacing:0;padding:7px 12px;font-size:.76rem;line-height:1.35}}.nav{z-index:60;border-bottom:1px solid var(--line);background:#0d0d0d;position:sticky;top:0}.nav-in{align-items:center;gap:18px;height:64px;display:flex}.logo{letter-spacing:.1em;color:#fff;flex-shrink:0;font-size:1.35rem;font-weight:900}.logo b{color:var(--gold)}.logo span{letter-spacing:.28em;color:var(--muted);text-transform:uppercase;margin-top:-2px;font-size:.44rem;font-weight:600;display:block}.slogan{color:var(--gold-lt);white-space:nowrap;border:1px solid #fab23d80;border-radius:10px;padding:.45rem .9rem;font-size:.8rem;font-weight:700}.nav-links{text-transform:uppercase;letter-spacing:.02em;gap:20px;margin-left:auto;font-size:.86rem;font-weight:600;display:flex}.nav-links a{color:#ddd}.nav-links a:hover{color:var(--gold)}.btn-up{color:#fff;text-transform:uppercase;white-space:nowrap;background:linear-gradient(90deg,#f04438,#ff7a45);border-radius:10px;padding:.6rem 1.2rem;font-size:.84rem;font-weight:800;box-shadow:0 6px 18px #f0443859}.btn-up:hover{transform:translateY(-1px)}.userchip{background:var(--panel);border:1px solid var(--line2);white-space:nowrap;border-radius:999px;align-items:center;gap:8px;padding:4px 12px 4px 4px;display:flex}.userchip .av{width:32px;height:32px;color:var(--gold);background:linear-gradient(135deg,#3a2f1a,#222);border-radius:50%;justify-content:center;align-items:center;font-size:.9rem;font-weight:800;display:flex}.userchip .t{font-size:.72rem;line-height:1.15}.userchip .t b{text-overflow:ellipsis;max-width:90px;font-size:.78rem;display:block;overflow:hidden}.userchip .plan{color:var(--gold);font-weight:800}@media (max-width:1150px){.nav-links{display:none}}@media (max-width:700px){.slogan{display:none}}.study{grid-template-columns:1fr 400px;align-items:start;gap:26px;padding:24px 0 60px;display:grid}@media (max-width:1024px){.study{grid-template-columns:1fr}}.player-box{border:1px solid var(--line2);aspect-ratio:16/9;background:#000;border-radius:14px;position:relative;overflow:hidden;box-shadow:0 24px 60px #00000080}.player-box iframe{border:0;width:100%;height:100%;display:block}.locked{text-align:center;z-index:5;background:#0a0a0ae0;flex-direction:column;justify-content:center;align-items:center;gap:14px;padding:24px;display:flex;position:absolute;inset:0}.locked .ic{font-size:3rem}.locked h3{font-size:1.3rem;font-weight:800}.locked p{color:var(--muted);max-width:420px;font-size:.95rem}.locked .btn-up{padding:.85rem 1.8rem;font-size:1rem}.vtitle{margin:18px 0 8px;font-size:1.45rem;font-weight:800;line-height:1.3}.vmeta{color:var(--muted);flex-wrap:wrap;align-items:center;gap:16px;font-size:.88rem;display:flex}.vmeta .tag-hot{background:var(--grad);color:#2a1c02;border-radius:999px;padding:3px 10px;font-size:.7rem;font-weight:800}.tag-free{color:#3fd68f;letter-spacing:.04em;background:#123f2a;border:1px solid #1e7a4f;border-radius:999px;padding:3px 10px;font-size:.7rem;font-weight:800}.tag-prem{color:#7fb3ff;letter-spacing:.04em;background:#1d2b4a;border:1px solid #2f4f8f;border-radius:999px;padding:3px 10px;font-size:.68rem;font-weight:800}.vdesc{color:var(--muted);border-top:1px solid var(--line);margin-top:14px;padding-top:14px;font-size:.92rem}.vdesc b{color:var(--gold-lt)}.vnav{justify-content:space-between;gap:12px;margin-top:18px;display:flex}.vnav a{background:var(--panel);border:1px solid var(--line2);border-radius:10px;padding:.7rem 1.2rem;font-size:.88rem;font-weight:700}.vnav a:hover{border-color:var(--gold);color:var(--gold)}.vnav a.done{background:var(--grad);color:#2a1c02;border:none}.upbanner{background:linear-gradient(90deg,#f0443824,#ff7a4514);border:1px solid #f0443859;border-radius:14px;flex-wrap:wrap;align-items:center;gap:16px;margin-top:22px;padding:16px 18px;display:flex}.upbanner .ub-t{flex:1;min-width:200px}.upbanner .ub-t b{color:var(--gold-lt);margin-bottom:3px;font-size:1rem;display:block}.upbanner .ub-t span{color:var(--muted);font-size:.86rem}.side{background:var(--ink2);border:1px solid var(--line);border-radius:14px;flex-direction:column;max-height:calc(100vh - 108px);display:flex;position:sticky;top:84px;overflow:hidden}.side-top{border-bottom:1px solid var(--line);align-items:center;gap:10px;padding:14px 16px;font-size:.9rem;font-weight:700;display:flex}.switch{cursor:pointer;background:#3a3a3a;border-radius:999px;flex-shrink:0;width:40px;height:22px;transition:all .2s;position:relative}.switch:after{content:"";background:#fff;border-radius:50%;width:16px;height:16px;transition:all .2s;position:absolute;top:3px;left:3px}.switch.on{background:var(--gold)}.switch.on:after{left:21px}.side-scroll{flex:1;overflow-y:auto}.side-scroll::-webkit-scrollbar{width:8px}.side-scroll::-webkit-scrollbar-thumb{background:#3a3a3a;border-radius:4px}.sec-chap{border-bottom:1px solid var(--line)}.sec-chap-h{cursor:pointer;-webkit-user-select:none;user-select:none;padding:14px 16px}.sec-chap-h h4{text-transform:uppercase;justify-content:space-between;gap:8px;font-size:.95rem;font-weight:800;display:flex}.sec-chap-h h4 .caret{color:var(--gold);transition:all .25s}.sec-chap.open .caret{transform:rotate(180deg)}.sec-chap-h .m{color:var(--muted2);gap:14px;margin-top:4px;font-size:.76rem;display:flex}.sec-chap-h .m b{color:var(--gold)}.sec-body{display:none}.sec-chap.open .sec-body{display:block}.vrow{cursor:pointer;border-top:1px solid #ffffff0a;gap:10px;padding:10px 14px;transition:all .15s;display:flex}.vrow:hover{background:#fab23d12}.vrow.active{border-left:3px solid var(--gold);background:linear-gradient(90deg,#fab23d38,#fab23d0f)}.vthumb{aspect-ratio:16/9;border:1px solid var(--line2);background:#000;border-radius:8px;flex-shrink:0;width:96px;position:relative;overflow:hidden}.vthumb img{object-fit:cover;width:100%;height:100%}.vthumb .no{color:var(--gold);background:#000000b3;border-radius:5px;padding:1px 5px;font-size:.62rem;font-weight:800;position:absolute;top:3px;right:4px}.vthumb .du{color:#fff;background:#000000bf;border-radius:5px;padding:1px 5px;font-size:.62rem;font-weight:700;position:absolute;bottom:3px;left:4px}.vthumb .lk{background:#00000073;justify-content:center;align-items:center;font-size:1rem;display:flex;position:absolute;inset:0}.vrow .ti{flex:1;min-width:0}.vrow .ti p{-webkit-line-clamp:2;-webkit-box-orient:vertical;font-size:.82rem;font-weight:600;line-height:1.35;display:-webkit-box;overflow:hidden}.vrow .ti .bg{flex-wrap:wrap;gap:6px;margin-top:5px;display:flex}.side-tabs{border-top:1px solid var(--line);display:flex}.side-tabs div{text-align:center;color:var(--muted);cursor:pointer;flex:1;padding:12px;font-size:.85rem;font-weight:700}.side-tabs div.on{color:var(--gold);border-top:2px solid var(--gold);margin-top:-1px}.cmt{color:var(--muted);padding:18px 16px;font-size:.88rem;display:none}.side.showcmt .side-scroll{display:none}.side.showcmt .cmt{display:block;overflow-y:auto}.upmodal{z-index:100;background:#000000d9;justify-content:center;align-items:center;padding:20px;display:none;position:fixed;inset:0}.upmodal.on{display:flex}.upbox{background:var(--panel);border:1px solid var(--gold);text-align:center;border-radius:18px;width:100%;max-width:520px;padding:34px;position:relative}.upbox .x{cursor:pointer;color:var(--muted);font-size:1.6rem;position:absolute;top:10px;right:16px}.upbox h3{text-transform:uppercase;font-size:1.4rem;font-weight:900}.upbox .price{color:var(--gold);margin:10px 0;font-size:2.4rem;font-weight:900}.upbox .price small{color:var(--muted);text-transform:none;letter-spacing:0;margin-top:2px;font-size:.4em;font-weight:700;display:block}.upbox ul{text-align:left;max-width:360px;color:var(--muted);margin:14px auto 20px;font-size:.92rem;list-style:none}.upbox li{padding:4px 0}.upbox li:before{content:"✓ ";color:var(--green);font-weight:800}.upbox .btn-up{padding:.95rem 2rem;font-size:1.05rem;display:inline-block}.upbox .note{color:var(--muted2);margin-top:12px;font-size:.78rem}footer{border-top:1px solid var(--line);color:var(--muted2);text-align:center;padding:26px 0;font-size:.8rem}@media (max-width:600px){.btn-up{white-space:normal;line-height:1.3}.vtitle{font-size:1.2rem}.side{max-height:none;position:static}.study{gap:18px}}@media (max-width:480px){.nav-in{gap:10px}.nav .btn-up{padding:.5rem .8rem;font-size:.72rem}.logo{font-size:1.15rem}.logo span{font-size:.42rem}.userchip .t{display:none}}@keyframes zSpin{to{transform:rotate(360deg)}}@keyframes zShine{0%{background-position:-140% 0}55%,to{background-position:240% 0}}@keyframes zFloatK{0%,to{transform:translateY(0)}50%{transform:translateY(-9px)}}@keyframes zBlinkK{0%,to{opacity:1}50%{opacity:.4}}@keyframes zArrDownK{0%,to{opacity:.45;transform:translateY(0)}50%{opacity:1;transform:translateY(6px)}}@keyframes zArrRightK{0%,to{opacity:.45;transform:translate(0)}50%{opacity:1;transform:translate(6px)}}@keyframes zLockK{0%,to{transform:rotate(0)}20%{transform:rotate(-9deg)}70%{transform:rotate(9deg)}}@keyframes zLiveK{0%{box-shadow:0 0 #f044388c}to{box-shadow:0 0 0 13px #f0443800}}@keyframes zPopK{0%{opacity:0;transform:scale(.85)}to{opacity:1;transform:scale(1)}}.z-spin{animation:14s linear infinite zSpin}.z-float{animation:3s ease-in-out infinite zFloatK}.z-blink{animation:1.2s ease-in-out infinite zBlinkK}.z-live{animation:1.6s ease-out infinite zLiveK}.z-arr-d{animation:1s ease-in-out infinite zArrDownK}.z-arr-r{animation:1s ease-in-out infinite zArrRightK;display:inline-block}.z-lock{transform-origin:50% 20%;animation:2.2s ease-in-out infinite zLockK;display:inline-block}.z-shine{position:relative;overflow:hidden}.z-shine:after{content:"";pointer-events:none;z-index:2;background:linear-gradient(100deg,#0000 32%,#ffffff80 50%,#0000 68%) 0 0/240% 100%;animation:3.4s ease-in-out infinite zShine;position:absolute;inset:0}.z-toast{color:#fff;z-index:99999;opacity:0;pointer-events:none;background:#221d26;border:1px solid #ffffff14;border-radius:11px;padding:12px 22px;font-size:.92rem;font-weight:600;transition:opacity .22s,transform .22s;position:fixed;bottom:30px;left:50%;transform:translate(-50%)scale(.9);box-shadow:0 14px 34px #00000073}.z-toast.show{opacity:1;transform:translate(-50%)scale(1)}.z-toast b{color:var(--gold-lt,#ffe1af)}@media (prefers-reduced-motion:reduce){.z-spin,.z-float,.z-blink,.z-live,.z-arr-d,.z-arr-r,.z-lock,.z-shine:after{animation:none}}.topbar a{color:inherit;text-decoration:none}.tb-contact{flex-wrap:wrap;flex:none;align-items:center;gap:16px;display:flex}.tb-marq{white-space:nowrap;flex:auto;min-width:0;overflow:hidden;-webkit-mask:linear-gradient(90deg,#0000,#000 5% 95%,#0000);mask:linear-gradient(90deg,#0000,#000 5% 95%,#0000)}.tb-marq>span{padding-left:100%;animation:59s linear infinite tbscroll;display:inline-block}.tb-marq:hover>span{animation-play-state:paused}.tb-marq b{color:var(--gold-lt,#ffe1af)}@keyframes tbscroll{0%{transform:translate(0)}to{transform:translate(-100%)}}@media (max-width:700px){.tb-contact{display:none}.topbar-in{justify-content:stretch}.tb-marq{flex:100%}}.study-wm{z-index:6;color:#ffffffb8;letter-spacing:.02em;pointer-events:none;-webkit-user-select:none;user-select:none;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);background:#0000006b;border-radius:8px;padding:4px 10px;font-size:.72rem;font-weight:700;position:absolute;top:10px;right:12px}@media (max-width:600px){.study-wm{padding:3px 7px;font-size:.62rem}}