:root{--bg:#f8fafc;--card:#fff;--border:#e2e8f0;--text:#0f172a;--muted:#64748b;--accent:#22c55e;--accent-d:#16a34a;--side:#0f172a;--side-text:#cbd5e1}
@media (prefers-color-scheme:dark){:root{--bg:#0b1220;--card:#111a2e;--border:#1f2a44;--text:#e5e7eb;--muted:#94a3b8;--side:#070d19}}
*{box-sizing:border-box;margin:0}
body{font-family:'Be Vietnam Pro',system-ui,sans-serif;background:var(--bg);color:var(--text);min-height:100vh}
.wrap{display:flex;min-height:calc(100vh - 64px)}
aside{width:230px;background:var(--side);color:var(--side-text);padding:20px 12px;position:sticky;top:64px;height:calc(100vh - 64px);flex-shrink:0}
.brand{font-weight:800;font-size:18px;color:#fff;padding:4px 10px 18px}
.brand span{color:var(--accent)}
aside h6{font-size:11px;letter-spacing:.08em;color:#64748b;padding:10px 10px 6px}
aside a{display:block;padding:9px 10px;border-radius:8px;color:inherit;text-decoration:none;font-size:14px}
aside a:hover{background:#1e293b}
aside a.on{background:rgba(34,197,94,.15);color:#fff}
main{flex:1;min-width:0;padding:32px clamp(16px,4vw,48px)}
h1{font-size:28px;font-weight:800}
.sub{color:var(--muted);margin:6px 0 12px}
.stats{display:flex;gap:16px;font-size:14px;color:var(--muted);margin-bottom:22px}
.bar{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin-bottom:22px}
.chips{display:flex;flex-wrap:wrap;gap:8px;flex:1 1 100%}
.chip{border:1px solid var(--border);background:var(--card);color:var(--text);padding:7px 14px;border-radius:999px;font:inherit;font-size:13px;cursor:pointer}
.chip.on{background:var(--accent);border-color:var(--accent);color:#fff;font-weight:600}
input,select{font:inherit;font-size:14px;padding:9px 12px;border:1px solid var(--border);border-radius:10px;background:var(--card);color:var(--text)}
input{flex:1 1 220px}
.count{font-weight:600;margin-bottom:14px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:18px}
.card{background:var(--card);border:1px solid var(--border);border-radius:12px;overflow:hidden;transition:.25s;position:relative}
.card:hover{transform:translateY(-4px);box-shadow:0 12px 24px rgba(0,0,0,.12);border-color:rgba(34,197,94,.4)}
.thumb{padding-top:52%;position:relative;background:linear-gradient(135deg,#1e293b,#334155)}
.thumb b{position:absolute;inset:0;display:grid;place-items:center;font-size:34px;color:rgba(255,255,255,.85)}
.tag{position:absolute;top:10px;padding:3px 9px;border-radius:8px;font-size:11px;font-weight:700;color:#fff}
.tag.free{left:10px;background:var(--accent-d)}
.tag.pin{right:10px;background:#f59e0b}
.body{padding:14px}
.body h3{font-size:15px;line-height:1.4;margin-bottom:10px;min-height:42px}
.meta{display:flex;flex-wrap:wrap;gap:6px 12px;font-size:12px;color:var(--muted)}
.price{margin-top:12px;color:var(--accent-d);font-weight:700;font-size:14px}
.empty{padding:40px;text-align:center;color:var(--muted)}
footer{margin-top:48px;padding-top:20px;border-top:1px solid var(--border);color:var(--muted);font-size:13px}

header{height:64px;background:var(--card);border-bottom:1px solid var(--border);display:flex;align-items:center;gap:16px;padding:0 24px;position:sticky;top:0;z-index:10}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:18px;text-decoration:none;color:var(--text);white-space:nowrap}
.logo i{width:34px;height:34px;border-radius:10px;background:linear-gradient(135deg,#0ea5e9,#22c55e);display:grid;place-items:center;color:#fff;font-style:normal;font-size:16px}
nav{display:flex;gap:6px;flex:1;justify-content:center;min-width:0}
nav a{padding:9px 14px;border-radius:10px;color:var(--text);text-decoration:none;font-size:14px;font-weight:600;white-space:nowrap}
nav a:hover{background:rgba(100,116,139,.12)}
nav a.on{background:linear-gradient(135deg,#0284c7,#0ea5e9);color:#fff;box-shadow:0 4px 12px rgba(14,165,233,.35)}
.acts{display:flex;align-items:center;gap:10px}
.btn{padding:9px 16px;border-radius:999px;font-size:14px;font-weight:700;text-decoration:none;color:#fff;white-space:nowrap}
.b1{background:linear-gradient(135deg,#06b6d4,#0ea5e9)}
.b2{background:linear-gradient(135deg,#0284c7,#0369a1)}
.cart{display:flex;align-items:center;gap:8px;padding:6px 14px;border-radius:12px;background:rgba(14,165,233,.12);color:var(--text);text-decoration:none;font-size:14px;font-weight:600;line-height:1.2}
.cart small{display:block;font-size:11px;font-weight:400;color:var(--muted)}
@media (max-width:1100px){nav a:not(.on){display:none}.cart small{display:none}}
@media (max-width:760px){header{padding:0 12px}.b1,.cart{display:none}}
@media (max-width:760px){aside{display:none}.stats{flex-wrap:wrap}}

.crumb{font-size:13px;color:var(--muted);margin-bottom:18px}.crumb a{color:inherit;text-decoration:none}.crumb a:hover{color:var(--accent-d)}
.chead{display:grid;grid-template-columns:280px minmax(0,1fr) 320px;gap:24px;margin-bottom:28px;align-items:start}
.chead>div:first-child{display:contents}
.cthumb{border-radius:14px;padding-top:56%;position:relative;background:linear-gradient(135deg,#1e293b,#334155);overflow:hidden}
.cthumb b{position:absolute;inset:0;display:grid;place-items:center;font-size:64px}
.cinfo h1{font-size:22px;line-height:1.35;margin:10px 0 14px}
.badges{display:flex;gap:8px;flex-wrap:wrap}
.badge{padding:4px 10px;border-radius:8px;font-size:12px;font-weight:700;background:rgba(100,116,139,.15)}
.badge.new{background:#dbeafe;color:#1d4ed8}.badge.hot{background:#ffedd5;color:#c2410c}
.cstats{display:flex;flex-wrap:wrap;gap:8px 18px;color:var(--muted);font-size:14px}
.pbox{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:20px;align-self:start;position:sticky;top:84px}
.pbox .pfree{font-size:22px;font-weight:800;color:var(--accent-d)}
.pbox p{color:var(--muted);font-size:13px;margin:6px 0 14px}
.cta{display:block;width:100%;padding:12px;border:0;border-radius:12px;background:linear-gradient(135deg,#16a34a,#22c55e);color:#fff;font:inherit;font-weight:700;cursor:pointer;text-align:center;text-decoration:none}
.cta2{display:block;width:100%;margin-top:10px;padding:10px;border:1px solid var(--border);border-radius:12px;background:transparent;color:var(--text);font:inherit;cursor:pointer}
.cta2.on{border-color:var(--accent);color:var(--accent-d)}
.clayout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:24px}
.sec{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:22px;margin-bottom:20px}
.sec h2{font-size:18px;margin-bottom:14px}.sec h3{font-size:15px;margin:16px 0 8px}
.sec p,.sec li{line-height:1.7;font-size:15px}.sec ul{padding-left:20px}
.lesson{border:1px solid var(--border);border-radius:10px;margin-bottom:10px;overflow:hidden}
.lesson summary{display:flex;align-items:center;gap:12px;padding:14px;cursor:pointer;list-style:none;font-weight:600;font-size:14px}
.lesson summary::-webkit-details-marker{display:none}
.lesson .n{width:28px;height:28px;border-radius:50%;background:rgba(34,197,94,.15);color:var(--accent-d);display:grid;place-items:center;font-size:13px;flex-shrink:0}
.lesson .t{flex:1}.lesson .fr{font-size:11px;padding:3px 8px;border-radius:6px;background:var(--accent-d);color:#fff}
.lesson .lb{padding:0 14px 14px;color:var(--muted);font-size:14px;line-height:1.6}
.stars{font-size:22px;letter-spacing:4px;color:#cbd5e1}
.locked{color:var(--muted);font-size:13px;margin-top:8px}
.sum{list-style:none;padding:0!important}.sum li{display:flex;justify-content:space-between;padding:10px 0;border-bottom:1px solid var(--border);font-size:14px}.sum li:last-child{border:0}.sum span{color:var(--muted)}
@media (max-width:1180px){.chead{grid-template-columns:240px minmax(0,1fr)}.pbox{grid-column:1/-1;position:static}}
@media (max-width:980px){.clayout{grid-template-columns:1fr}.pbox{position:static}}
@media (max-width:640px){.chead{grid-template-columns:1fr}.cthumb{max-width:360px}}
a.card{display:block;color:inherit;text-decoration:none}

.authpage{display:block}
.authwrap{min-height:calc(100vh - 64px);display:flex;flex-direction:column;align-items:center;justify-content:center;padding:32px 16px;background:linear-gradient(160deg,rgba(14,165,233,.10),rgba(99,102,241,.08))}
.authbrand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:20px;margin-bottom:18px}
.authbrand i{width:34px;height:34px;border-radius:10px;background:linear-gradient(135deg,#0ea5e9,#22c55e);display:grid;place-items:center;color:#fff;font-style:normal}
.authcard{width:100%;max-width:440px;background:var(--card);border:1px solid var(--border);border-radius:24px;padding:36px;box-shadow:0 20px 50px rgba(15,23,42,.15)}
.authcard h1{font-size:26px;text-align:center}
.authsub{text-align:center;color:var(--muted);margin:6px 0 20px;font-size:14px}
.authcard label{display:block;font-weight:600;font-size:14px;margin:14px 0 6px}
.authcard input{width:100%;padding:13px 14px;border-radius:12px;background:rgba(100,116,139,.08)}
.pwrow{position:relative}
.pwrow input{padding-right:46px}
.eye{position:absolute;right:8px;top:50%;transform:translateY(-50%);border:0;background:none;cursor:pointer;font-size:16px;opacity:.7}
.gbtn{width:100%;display:flex;align-items:center;justify-content:center;gap:10px;padding:11px;border:1px solid var(--border);border-radius:10px;background:var(--card);color:var(--text);font:inherit;font-size:14px;cursor:not-allowed;opacity:.55}
.or{display:flex;align-items:center;gap:12px;color:var(--muted);font-size:13px;margin:18px 0 4px}
.or::before,.or::after{content:'';flex:1;height:1px;background:var(--border)}
.err{min-height:20px;margin-top:10px;color:#dc2626;font-size:13px}
.submit{width:100%;margin-top:6px;padding:14px;border:0;border-radius:999px;background:linear-gradient(135deg,#0284c7,#0891b2);color:#fff;font:inherit;font-weight:700;font-size:16px;cursor:pointer}
.submit:disabled{opacity:.6;cursor:wait}
.authfoot{margin-top:18px;color:var(--muted);font-size:14px}
.authfoot a{color:#0284c7;font-weight:700;text-decoration:none}