:root{--canvas:#f7f7f8;--surface:#fff;--surface-2:#f1f2f5;--text:#0b0f1a;--muted:#4b5565;--subtle:#636c7d;--border:#e5e7eb;--border-strong:#d4d7de;--brand:#5b5bd6;--brand-soft:#5b5bd61a;--amber-bg:#fef3c7;--amber:#b45309;--ink:#0b0f1a;--shadow-card:0 1px 2px #1018280a,0 4px 12px -2px #1018280f;--shadow-pop:0 16px 40px -12px #10182838;--shadow-xs:0 1px 2px #1018280d;--r-md:10px;--r-lg:14px;
--font:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",sans-serif}
.dark{--canvas:#0b0f1a;--surface:#121826;--surface-2:#182033;--text:#e8ecf3;--muted:#a3adbf;--subtle:#8993a6;--border:#243047;--border-strong:#2f3c57;--brand:#8b8bff;--brand-soft:#8b8bff24;--amber-bg:#f59e0b29;--amber:#fbbf24}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:var(--font);background:var(--canvas);color:var(--text);letter-spacing:.01em;font-size:16px;line-height:1.65;min-height:100vh;display:flex;flex-direction:column;overflow-x:hidden}
main{flex:1}
a{color:inherit;text-decoration:none}
ul{list-style:none}
svg{display:block}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
[id]{scroll-margin-top:84px}
.container{width:100%;max-width:1200px;margin-inline:auto;padding-inline:20px}
@media(min-width:640px){.container{padding-inline:32px}}
.muted{color:var(--muted)}.small{font-size:14px}
.eyebrow{letter-spacing:.06em;color:var(--brand);font-size:13px;font-weight:600}
h2{font-size:30px;font-weight:600;letter-spacing:-.01em;line-height:1.25;margin-top:8px}
@media(min-width:768px){h2{font-size:36px}}
.sec{padding-top:80px}@media(min-width:768px){.sec{padding-top:96px}}
.sec h2+.muted,.narrow h2+.muted{margin-top:12px}
.narrow{max-width:42rem}
/* buttons */
.btn{border-radius:var(--r-md);white-space:nowrap;display:inline-flex;align-items:center;justify-content:center;gap:8px;height:40px;padding-inline:18px;font-size:15px;font-weight:500;line-height:1;transition:background-color .15s,border-color .15s,color .15s,box-shadow .15s,transform .15s}
.btn svg{width:16px;height:16px}
.btn-lg{height:48px;padding-inline:24px;font-size:16px}
.btn-sm{height:34px;padding-inline:14px;font-size:14px}
.btn-primary{background:var(--brand);color:#fff;box-shadow:0 1px 2px #1018281f,inset 0 1px #ffffff1f}
.btn-primary:hover{filter:brightness(1.08)}
.dark .btn-primary{color:#0b0f1a}
.btn-secondary{background:var(--surface);color:var(--text);border:1px solid var(--border-strong);box-shadow:var(--shadow-xs)}
.btn-ghost{color:var(--muted)}.btn-ghost:hover{color:var(--text)}
.btn-light{background:#fff;color:#0b0f1a}.btn-light:hover{background:#e8ecf3}
.btn-outline-light{color:#fff;border:1px solid #ffffff38}.btn-outline-light:hover{background:#ffffff14}
.btn:disabled{opacity:.55;cursor:not-allowed}
.btn:disabled:hover{background:inherit;filter:none}
.full{width:100%}.mt5{margin-top:20px}
.badge{white-space:nowrap;border-radius:999px;display:inline-flex;align-items:center;gap:4px;height:22px;padding-inline:8px;font-size:12px;font-weight:500;line-height:1}
.badge svg{width:14px;height:14px}
.badge-dark{color:#e8ecf3;background:#ffffff1a}
.badge-amber{background:var(--amber-bg);color:var(--amber)}
/* header */
.site-header{position:sticky;top:0;z-index:50;border-bottom:1px solid color-mix(in srgb,var(--border) 80%,transparent);background:color-mix(in srgb,var(--canvas) 85%,transparent);backdrop-filter:blur(20px) saturate(1.5);-webkit-backdrop-filter:blur(20px) saturate(1.5)}
.nav{display:flex;align-items:center;gap:32px;height:64px}
.brand{display:flex;align-items:center;gap:10px;font-size:17px;font-weight:600;letter-spacing:-.01em}
.brand img{border-radius:8px}
.links{display:none;gap:4px}
.links a{padding:8px 12px;border-radius:6px;font-size:15px;color:var(--muted);transition:color .15s}
.links a:hover{color:var(--text)}
.nav-r{margin-left:auto;display:flex;align-items:center;gap:8px}
.icon-btn{padding-inline:8px}
.icon-btn svg{width:18px;height:18px}
.i-sun{display:none}.dark .i-sun{display:block}.dark .i-moon{display:none}
.join{display:none}
.mmenu{position:relative}
.mmenu summary{list-style:none;cursor:pointer;display:grid;place-items:center;width:34px;height:34px;color:var(--muted)}
.mmenu summary::-webkit-details-marker{display:none}
.mmenu svg{width:22px;height:22px}
.mpanel{position:absolute;right:0;top:44px;width:200px;display:flex;flex-direction:column;gap:2px;padding:8px;background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);box-shadow:var(--shadow-pop)}
.mpanel a:not(.btn){padding:10px 12px;border-radius:8px;font-size:15px;color:var(--muted)}
.mpanel a:not(.btn):hover{background:var(--surface-2);color:var(--text)}
.mpanel .btn{margin-top:6px}
@media(min-width:768px){.links{display:flex}.join{display:inline-flex}.mmenu{display:none}}
/* hero */
.hero-dark{color:#e8ecf3;background-color:#0b0f1a;background-image:radial-gradient(60% 80% at 85% 0,#5b5bd661,#0000 60%),radial-gradient(40% 60% at 0 100%,#14b8a624,#0000 60%),linear-gradient(#ffffff0a 1px,#0000 1px),linear-gradient(90deg,#ffffff0a 1px,#0000 1px);background-size:auto,auto,48px 48px,48px 48px;overflow:hidden}
.hero{display:grid;gap:48px;align-items:center;padding-block:64px}
@media(min-width:768px){.hero{padding-block:96px}}
@media(min-width:1024px){.hero{grid-template-columns:1.1fr 1fr}}
.hero h1{margin-top:24px;font-size:40px;font-weight:600;line-height:1.15;letter-spacing:-.02em;color:#fff}
@media(min-width:768px){.hero h1{font-size:56px}}
.grad{background:linear-gradient(90deg,#b4b4ff,#8b8bff,#5eead4);-webkit-background-clip:text;background-clip:text;color:transparent}
.lead{margin-top:24px;max-width:36rem;font-size:18px;line-height:1.65;color:#ffffffb3}
.actions{margin-top:36px;display:flex;flex-wrap:wrap;gap:12px}.actions.c{justify-content:center}
.ticks{margin-top:36px;display:flex;flex-wrap:wrap;gap:8px 24px;font-size:14px;color:#ffffff99}
.ticks li{display:flex;align-items:center;gap:8px}
.ticks svg{width:16px;height:16px;color:#5eead4}
.hcard-wrap{position:relative;display:none}
@media(min-width:1024px){.hcard-wrap{display:block}}
.glow{position:absolute;inset:-24px;border-radius:32px;background:#5b5bd633;filter:blur(64px)}
.hcard{position:relative;overflow:hidden;border-radius:20px;border:1px solid #ffffff1a;background:#121826e6;box-shadow:0 25px 50px -12px #00000080;backdrop-filter:blur(8px)}
.hbody{padding:20px}
.hhead{display:flex;align-items:baseline;justify-content:space-between;gap:12px;margin-bottom:12px}
.hhead p{font-weight:600;color:#fff}.hhead span{font-size:13px;color:#ffffff80}
.lessons li{display:flex;align-items:center;gap:12px;padding:10px 12px;border-radius:8px;font-size:14px;color:#ffffff99}
.lessons li.first{background:#ffffff0d;color:#fff}
.lessons .dot{display:grid;place-items:center;width:24px;height:24px;flex-shrink:0;border-radius:50%;background:#ffffff1a}
.dot svg{width:11px;height:11px}
.lt{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.try{flex-shrink:0;font-size:12px;color:#fbbf24}
/* covers */
.cover{position:relative;isolation:isolate;overflow:hidden;aspect-ratio:16/9}
.cover.h44{aspect-ratio:auto;height:176px}
.rings{position:absolute;right:-40px;top:-40px;height:140%;opacity:.3}
.shade{position:absolute;inset:0;background:radial-gradient(80% 60% at 0 100%,#00000047,transparent)}
.cover-in{position:relative;display:flex;flex-direction:column;justify-content:space-between;align-items:flex-start;height:100%;padding:16px}
.tag{border-radius:999px;background:#ffffff26;padding:2px 8px;font-size:11px;font-weight:500;color:#ffffffe6;backdrop-filter:blur(4px)}
.cname{max-width:90%;font-size:24px;font-weight:600;line-height:1.25;color:#fff;text-shadow:0 1px 2px #0003}
/* cards */
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);box-shadow:var(--shadow-card)}
.p6{padding:24px}
.sec-h{display:flex;align-items:flex-end;justify-content:space-between;gap:24px}
.sec-h .muted{max-width:42rem}
.grid3{margin-top:32px;display:grid;gap:24px}
@media(min-width:640px){.grid3{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1024px){.grid3{grid-template-columns:repeat(3,1fr)}}
.course{display:flex;flex-direction:column;overflow:hidden;transition:transform .2s,box-shadow .2s}
.course:hover{transform:translateY(-2px);box-shadow:var(--shadow-pop)}
.cbody{padding:20px;display:flex;flex-direction:column;flex:1}
.crow{display:flex;align-items:flex-start;justify-content:space-between;gap:12px}
.crow h3{font-size:17px;font-weight:600;line-height:1.4}
.cbody p{margin-top:6px;font-size:14px;line-height:1.6;color:var(--muted)}
.meta{margin-top:auto;padding-top:16px;display:flex;flex-wrap:wrap;gap:6px;font-size:13px;color:var(--subtle)}
/* how */
.how{display:grid;gap:40px}
@media(min-width:1024px){.how{grid-template-columns:1fr 1.4fr;gap:64px}}
.how .muted{margin-top:16px}
.howg{display:grid;gap:16px}
@media(min-width:640px){.howg{grid-template-columns:repeat(3,1fr)}}
@media(min-width:1024px){.howg{grid-template-columns:1fr}}
@media(min-width:1280px){.howg{grid-template-columns:repeat(3,1fr)}}
.ibox{display:grid;place-items:center;width:40px;height:40px;border-radius:10px;background:var(--brand-soft);color:var(--brand)}
.ibox svg{width:20px;height:20px}
.ibox.big{width:44px;height:44px;border-radius:12px}
.howg h3{margin-top:16px;font-size:16px;font-weight:600}
.howg p{margin-top:6px;font-size:14px;line-height:1.6;color:var(--muted)}
/* pricing */
.plans{margin:48px auto 0;max-width:56rem;display:grid;gap:20px}
@media(min-width:1024px){.plans{grid-template-columns:repeat(3,1fr)}}
.plan{position:relative;display:flex;flex-direction:column;padding:28px;border-radius:20px}
.plan h3{font-size:16px;font-weight:600}
.plan .sub{margin-top:4px;font-size:14px;color:var(--muted)}
.price{margin-top:24px;display:flex;align-items:baseline;gap:6px}
.amt{font-size:36px;font-weight:600;line-height:1;letter-spacing:-.01em}
.per{font-size:14px;color:var(--muted);white-space:nowrap}
.plan ul{margin:24px 0 32px;display:grid;gap:10px;font-size:14px;color:var(--muted)}
.plan li{display:flex;gap:8px}
.plan li svg{width:16px;height:16px;margin-top:4px;flex-shrink:0;color:var(--brand)}
.plan .btn{margin-top:auto}
.plan.feat{background:var(--ink);color:#fff;border-color:transparent;box-shadow:var(--shadow-pop);order:-1}
.dark .plan.feat{background:#1d2538}
@media(min-width:1024px){.plan.feat{order:0}}
.plan.feat .sub,.plan.feat .per{color:#ffffff99}
.plan.feat ul{color:#ffffffcc}
.plan.feat li svg{color:#5eead4}
.best{position:absolute;top:-12px;left:28px;background:#f59e0b;color:#0b0f1a}
/* faq */
.faq{margin-top:32px;max-width:48rem;border-block:1px solid var(--border)}
.faq details{padding:20px 0}
.faq details+details{border-top:1px solid var(--border)}
.faq summary{display:flex;align-items:center;justify-content:space-between;gap:16px;cursor:pointer;font-weight:500;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.chev{width:18px;height:18px;flex-shrink:0;color:var(--subtle);transition:transform .2s}
details[open]>summary .chev{transform:rotate(180deg)}
.faq p{margin-top:12px;padding-right:32px;font-size:15px;line-height:1.7;color:var(--muted)}
/* support */
.support{margin-top:40px;display:grid;max-width:56rem}
@media(min-width:768px){.support{grid-template-columns:repeat(3,1fr)}}
.sc{display:flex;flex-direction:column;transition:box-shadow .2s}
.sc:hover{box-shadow:var(--shadow-pop)}
.st{margin-top:20px;font-weight:600}
.sc .muted{margin-top:4px;word-break:break-all}
/* cta */
.cta{position:relative;border-radius:24px;padding:56px 32px;text-align:center}
.cta h2{margin-top:0;color:#fff}
.cta p{max-width:36rem;margin:12px auto 0;color:#ffffffb3}
.cta .actions{margin-top:32px}
/* footer */
.foot{margin-top:96px;border-top:1px solid var(--border);background:var(--surface)}
.fgrid{display:grid;gap:40px;padding-block:56px}
@media(min-width:640px){.fgrid{grid-template-columns:1.4fr 1fr;align-items:start}}
.fbrand{font-size:17px;font-weight:600;letter-spacing:-.01em}
.fdesc{margin-top:12px;max-width:20rem;line-height:1.7}
.flinks{display:grid;gap:10px;font-size:14px;color:var(--muted)}
.flinks a:hover{color:var(--text)}
.fbar{border-top:1px solid var(--border)}
.fbar .container{display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px;padding-block:20px;font-size:13px;color:var(--subtle)}