:root{--purple:#500676;--purple-2:#721b9e;--purple-soft:#f6eff9;--tiffany:#81d8d0;--tiffany-2:#2aaea4;--ink:#172033;--muted:#687286;--line:#e8eaf0;--surface:#fff;--canvas:#fbfbfd;--warm:#ffb347;--danger:#b8324a;--shadow:0 18px 60px rgba(51,15,69,.1);color-scheme:light}
html[data-theme=dark]{--ink:#f4eff8;--muted:#bdb5c7;--line:#3a3042;--surface:#211928;--canvas:#17131c;--purple-soft:#302039;--shadow:0 18px 60px rgba(0,0,0,.3);color-scheme:dark}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--canvas);color:var(--ink);font:15px/1.6 Inter,"PingFang SC","Microsoft YaHei","Noto Sans SC",Arial,sans-serif;min-width:320px}
button,input,select{font:inherit;color:inherit}button,a{font-size:max(12px,inherit)}button{border:0;cursor:pointer}a{color:inherit;text-decoration:none}img{display:block;max-width:100%}
.site-header{height:76px;padding:0 clamp(20px,4vw,72px);display:flex;align-items:center;gap:42px;background:color-mix(in srgb,var(--surface) 93%,transparent);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50;backdrop-filter:blur(18px)}
.brand{display:flex;align-items:center;gap:11px;min-width:max-content}.brand img{width:42px;height:42px;border-radius:12px;object-fit:cover;box-shadow:0 6px 20px rgba(80,6,118,.2)}.brand span{display:flex;flex-direction:column;line-height:1.25}.brand strong{font-size:17px}.brand small{font-size:10px;color:var(--muted);letter-spacing:.06em;text-transform:uppercase}
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.access-section{max-width:1200px;margin:90px auto 20px;display:grid;grid-template-columns:210px 1fr minmax(300px,390px);align-items:center;gap:42px;padding:36px 44px;border-radius:26px;background:linear-gradient(120deg,#f1e7f5,#effaf9);border:1px solid #eadcf0;position:relative;overflow:hidden}html[data-theme=dark] .access-section{background:linear-gradient(120deg,#302038,#19302f);border-color:#46324e}.access-art{height:130px;position:relative;border-radius:22px;background:linear-gradient(140deg,var(--purple),#8a38a7);display:flex;flex-direction:column;align-items:center;justify-content:center;color:#fff;overflow:hidden}.access-art b{font-size:31px}.access-art small{font-size:10px}.access-orbit{position:absolute;width:150px;height:150px;border:24px solid rgba(129,216,208,.28);border-radius:50%;right:-55px;top:-65px}.code-control{display:flex;flex-wrap:wrap;gap:8px}.code-control input{height:48px;min-width:0;flex:1;background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:0 13px;outline:none}.code-control button{height:48px}.code-control small{width:100%;font-size:10px;color:var(--muted)}
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.drawer-layer,.modal-layer{position:fixed;inset:0;z-index:100;background:rgba(17,12,21,.42);opacity:0;visibility:hidden;transition:.25s;backdrop-filter:blur(4px)}.drawer-layer.open,.modal-layer.open{opacity:1;visibility:visible}.learning-drawer{position:absolute;right:0;top:0;bottom:0;width:min(760px,100%);background:var(--canvas);padding:30px;transform:translateX(100%);transition:.3s ease;overflow:auto}.drawer-layer.open .learning-drawer{transform:none}.learning-drawer>header,.modal>header{display:flex;justify-content:space-between;gap:20px;align-items:flex-start}.learning-drawer h2,.modal h2{margin:5px 0 0;font-size:27px}.learning-drawer header p,.modal header p{margin:2px 0;color:var(--muted);font-size:12px}.learning-drawer header button,.modal header>button{width:36px;height:36px;border-radius:50%;background:var(--surface);border:1px solid var(--line);font-size:22px}.my-course-grid{grid-template-columns:repeat(2,minmax(0,1fr));margin-top:28px}.modal{position:absolute;left:50%;top:50%;width:min(860px,calc(100% - 32px));max-height:calc(100vh - 36px);transform:translate(-50%,-46%) scale(.98);background:var(--surface);border:1px solid var(--line);border-radius:22px;box-shadow:0 30px 100px rgba(0,0,0,.24);display:flex;flex-direction:column;transition:.24s}.modal-layer.open .modal{transform:translate(-50%,-50%) scale(1)}.modal>header{padding:24px 26px 18px;border-bottom:1px solid var(--line)}.modal-body{padding:24px 26px;overflow:auto}.modal-footer{padding:16px 26px;border-top:1px solid var(--line);display:flex;justify-content:flex-end;gap:10px}.modal-footer .primary-button,.modal-footer .secondary-button{height:43px}.course-detail-hero{padding:22px;border-radius:17px;background:linear-gradient(120deg,var(--purple-soft),color-mix(in srgb,var(--tiffany) 18%,var(--surface)));display:grid;grid-template-columns:1fr auto;gap:22px}.course-detail-hero h3{font-size:22px;margin:7px 0}.course-detail-hero p{color:var(--muted);margin:0}.detail-facts{display:grid;grid-template-columns:1fr 1fr;gap:7px}.detail-facts span{padding:10px;border-radius:10px;background:var(--surface);font-size:10px;color:var(--muted)}.detail-facts b{display:block;color:var(--ink);font-size:12px}.lesson-list{margin-top:18px;display:grid;gap:8px}.lesson-item{display:grid;grid-template-columns:34px 1fr auto;align-items:center;gap:12px;padding:12px;border:1px solid var(--line);border-radius:12px}.lesson-item.unlocked{cursor:pointer}.lesson-item.unlocked:hover{border-color:#c9a7d8;background:var(--purple-soft)}.lesson-index{font-size:11px;color:var(--muted)}.lesson-item strong{font-size:13px}.lesson-item small{display:block;font-size:10px;color:var(--muted)}.lesson-state{font-size:10px;color:var(--purple);font-weight:700}.payment-box{display:grid;grid-template-columns:190px 1fr;gap:25px;align-items:center}.payment-qr{height:190px;border:1px dashed var(--line);border-radius:15px;display:grid;place-items:center;text-align:center;color:var(--muted);font-size:12px}.payment-copy h3{font-size:20px}.login-modal{width:min(440px,calc(100% - 32px))}.login-modal label{display:block;font-size:12px;font-weight:700;margin-bottom:16px}.login-modal input{display:block;width:100%;height:48px;border:1px solid var(--line);border-radius:11px;background:var(--canvas);padding:0 13px;margin-top:6px;outline:none}.login-modal input:focus{border-color:var(--purple)}.form-message{min-height:22px;font-size:12px;color:var(--danger)}
.account-popover{position:fixed;z-index:80;right:72px;top:68px;width:220px;padding:12px;background:var(--surface);border:1px solid var(--line);border-radius:15px;box-shadow:var(--shadow);opacity:0;visibility:hidden;transform:translateY(-6px);transition:.2s}.account-popover.open{opacity:1;visibility:visible;transform:none}.account-popover>div{display:flex;gap:9px;align-items:center;padding:7px 7px 12px;border-bottom:1px solid var(--line)}.account-popover p{display:flex;flex-direction:column;margin:0}.account-popover p b{font-size:12px}.account-popover p small{font-size:10px;color:var(--muted)}.account-popover>a,.account-popover>button{display:block;width:100%;text-align:left;padding:10px 8px;background:none;border-radius:8px;font-size:12px}.account-popover>a:hover,.account-popover>button:hover{background:var(--purple-soft);color:var(--purple)}.toast{position:fixed;left:50%;bottom:28px;z-index:150;transform:translate(-50%,18px);opacity:0;visibility:hidden;background:#28162f;color:#fff;padding:11px 18px;border-radius:11px;font-size:12px;box-shadow:var(--shadow);transition:.25s}.toast.show{transform:translate(-50%,0);opacity:1;visibility:visible}.toast.error{background:var(--danger)}.busy{opacity:.65;pointer-events:none}
@media(max-width:1100px){.main-nav{display:none}.mobile-menu{display:block;order:4}.site-header.menu-open .main-nav{display:flex;position:absolute;top:75px;left:0;right:0;height:auto;padding:10px 20px;background:var(--surface);border-bottom:1px solid var(--line);box-shadow:var(--shadow)}.site-header.menu-open .main-nav button,.site-header.menu-open .main-nav>a{height:44px}.site-header.menu-open .main-nav .nav-resource-link{align-self:stretch;margin:0;justify-content:center}.hero{grid-template-columns:1fr .78fr;padding-left:50px;padding-right:50px}.hero-stage{transform:scale(.88)}.course-grid{grid-template-columns:repeat(3,1fr)}.access-section{margin-left:24px;margin-right:24px;grid-template-columns:160px 1fr}.code-control{grid-column:1/-1}.header-actions .text-action{display:none}}
@media(max-width:820px){.site-header{height:66px;padding:0 16px;gap:12px}.brand img{width:36px;height:36px}.brand strong{font-size:14px}.brand small{display:none}.header-actions{gap:6px}.header-actions .back-product,.header-actions .icon-button{display:none}.account-button{padding:0 10px}.site-header.menu-open .main-nav{top:65px;display:grid;grid-template-columns:1fr 1fr}.hero{min-height:auto;grid-template-columns:1fr;padding:58px 24px 35px}.hero-copy{text-align:center;margin:auto}.hero-copy>p{font-size:15px}.hero-actions,.hero-facts{justify-content:center}.hero-stage{height:330px;transform:scale(.88)}.search-dock{margin-top:-10px;padding:0 14px}.facet-row{grid-template-columns:1fr 1fr}.reset-button{height:42px}.catalog-section,.media-section{padding:65px 16px 20px}.course-grid{grid-template-columns:repeat(2,1fr)}.type-tabs{display:flex;overflow:auto;padding-bottom:5px}.type-tabs button{min-width:130px}.access-section{grid-template-columns:1fr;margin:65px 16px 15px;padding:28px}.access-art{display:none}.media-grid{grid-template-columns:1fr 1fr}body>footer{grid-template-columns:1fr}.footer-links{flex-wrap:wrap}.my-course-grid{grid-template-columns:1fr}.account-popover{right:14px;top:62px}.course-detail-hero{grid-template-columns:1fr}.payment-box{grid-template-columns:1fr}.payment-qr{width:190px;margin:auto}}
@media(max-width:540px){.header-actions .account-button{max-width:118px}.account-button #accountLabel{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.hero{padding-top:45px}.hero h1{font-size:38px}.hero-actions{flex-direction:column}.hero-actions button{width:100%}.hero-facts span{padding:0 15px}.hero-facts b{font-size:20px}.hero-stage{height:280px;transform:none}.course-player{width:88%;height:220px}.player-screen{height:125px}.hero-duck{width:86px}.float-tag{display:none}.facet-row{grid-template-columns:1fr}.keyword-control{height:auto;min-height:52px;flex-wrap:wrap;padding:8px}.keyword-control svg{margin-left:6px}.keyword-control input{height:38px}.keyword-control button{width:100%}.section-heading{align-items:flex-start;flex-direction:column}.course-grid{grid-template-columns:1fr}.course-cover{height:190px}.media-grid{grid-template-columns:1fr}.access-section{padding:24px 18px}.code-control input,.code-control button{width:100%;flex:auto}.learning-drawer{padding:22px 14px}.modal-body,.modal>header,.modal-footer{padding-left:17px;padding-right:17px}.modal-footer{flex-direction:column-reverse}.modal-footer>*{width:100%}.lesson-item{grid-template-columns:28px 1fr}.lesson-state{grid-column:2}.site-header.menu-open .main-nav{grid-template-columns:1fr}}