:root{--ink:#17423c;--muted:#526b65;--green:#206653;--mint:#e6f3ea;--paper:#faf9f5;--line:#dbe5df;--pink:#f8dcd2}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:"Microsoft YaHei","PingFang SC",sans-serif;font-size:16px;line-height:1.65}button,input{font:inherit}button,a,input{-webkit-tap-highlight-color:transparent}button,a{touch-action:manipulation}button{cursor:pointer}button:disabled{opacity:.6;cursor:wait}a{color:inherit;text-decoration:none}button:focus-visible,a:focus-visible,input:focus-visible{outline:3px solid #bb7459;outline-offset:4px}[hidden]{display:none!important}.learn-header{max-width:1320px;margin:auto;padding:26px 40px;display:flex;align-items:center;justify-content:space-between;gap:20px}.learn-header img{display:block;object-fit:contain}.learn-header>a:last-child{font-size:14px;min-height:44px;display:flex;align-items:center}main{max-width:1280px;margin:auto;padding:22px 40px 70px;min-height:75vh}.eyebrow{font-size:12px;font-weight:700;letter-spacing:2px;color:var(--green);margin:0 0 18px}h1,h2,p{margin-top:0}h1{font-size:clamp(32px,4vw,56px);line-height:1.25;letter-spacing:-1px;font-weight:700}h2{font-size:22px;line-height:1.45}.muted{color:var(--muted)}.learn-login{display:grid;grid-template-columns:1.15fr 1fr;gap:70px;align-items:center;max-width:1080px;margin:30px auto}.learn-intro>p:not(.eyebrow){color:var(--muted);line-height:1.9}.learn-intro>img{max-width:100%;height:auto;display:block;margin-top:20px}.learn-login-card{background:#fff;padding:45px;border:1px solid var(--line);border-radius:24px;box-shadow:0 15px 45px #17423c07}.learn-pill{display:inline-block;background:var(--mint);padding:7px 12px;border-radius:30px;font-size:11px;font-weight:700;letter-spacing:1.5px;margin-bottom:25px}.learn-login-card h2{font-size:27px;margin-bottom:10px}.learn-login-card label{display:block;font-size:14px;font-weight:700;margin:30px 0 10px}.learn-login-card input{width:100%;min-height:54px;border:1px solid #a6bbb0;border-radius:10px;padding:13px;background:#fdfefb;color:var(--ink);font-size:15px}.primary{background:var(--green);color:#fff;border:0;border-radius:10px;padding:14px 20px;min-height:50px;transition:background .2s}.primary:hover{background:#174b3d}.learn-login-card .primary{display:flex;justify-content:space-between;width:100%;margin-top:20px}.learn-help{font-size:13px;color:var(--muted);line-height:1.9;border-top:1px solid var(--line);margin:27px 0 0;padding-top:22px}.learn-welcome{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:35px 0}.learn-welcome h1{font-size:40px;margin-bottom:14px}.quiet{background:transparent;border:1px solid #bdcec3;border-radius:9px;padding:10px 15px;min-height:44px;color:var(--ink)}.quiet:hover{background:var(--mint)}.learn-section-title{display:flex;gap:20px;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);padding-bottom:18px;margin:10px 0 28px}.learn-section-title h2{margin:0}.learn-section-title span{font-size:14px;color:var(--muted)}.learn-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:26px}.learn-card{display:flex;flex-direction:column;background:#fff;border:1px solid var(--line);border-radius:18px;overflow:hidden}.learn-card-cover{height:185px;background:var(--mint);display:grid;place-items:center;font-size:36px;color:var(--green)}.learn-card-cover img{width:100%;height:100%;object-fit:cover;min-height:0}.learn-card-content{padding:24px;display:flex;flex-direction:column;flex:1}.learn-card h3{font-size:21px;margin:0 0 12px;overflow-wrap:anywhere}.learn-card p{color:var(--muted);font-size:14px;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}.learn-card-progress{font-size:13px;color:var(--muted);margin:auto 0 18px;padding-top:15px}.learn-card-track{height:5px;background:var(--mint);border-radius:8px;margin-top:10px;overflow:hidden}.learn-card-track span{display:block;background:var(--green);height:100%}.learn-empty{border:1px dashed #b9cdc1;padding:50px;text-align:center;border-radius:20px}.learn-player-heading{margin:30px 0}.learn-player-heading h1{font-size:32px;margin:0}.learn-player-layout{display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:28px;align-items:start}.learn-video-shell{aspect-ratio:16/9;background:#12302a;border-radius:16px;overflow:hidden;display:grid;position:relative}.learn-video-shell video{width:100%;height:100%;display:block;min-width:0}.learn-video-shell>div{position:absolute;inset:0;display:grid;place-items:center;color:#dcece2;pointer-events:none}.learn-video-heading{display:flex;gap:15px;align-items:center;justify-content:space-between;margin-top:22px}.learn-video-heading h2{margin:0}.learn-summary{white-space:pre-line;color:var(--muted);border-top:1px solid var(--line);padding-top:24px;font-size:15px}.learn-directory{background:#fff;border:1px solid var(--line);border-radius:16px;overflow:hidden}.learn-directory-title{padding:20px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.learn-directory-title h2{margin:0;font-size:19px}.learn-directory-title span{font-size:13px;color:var(--muted)}#learn-video-list{max-height:550px;overflow:auto;padding:8px}.learn-lesson{width:100%;text-align:left;background:transparent;border:0;border-radius:9px;padding:15px 12px;min-height:60px;color:var(--ink);display:grid;grid-template-columns:28px 1fr;gap:8px;line-height:1.6}.learn-lesson:hover,.learn-lesson[aria-current=true]{background:var(--mint)}.learn-lesson[aria-current=true]{box-shadow:inset 3px 0 var(--green)}.learn-lesson small{display:block;color:var(--muted);font-size:12px}.learn-footer{text-align:center;padding:25px;color:var(--muted);font-size:13px;border-top:1px solid var(--line)}#learn-message{background:#fff0e9;border:1px solid #d6a18d;border-radius:12px;padding:18px;margin:25px 0;color:#7a3321}.learn-loading{text-align:center;padding:60px;color:var(--muted)}@media(max-width:1000px){.learn-login{gap:35px}.learn-login-card{padding:30px}.learn-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.learn-player-layout{grid-template-columns:minmax(0,1fr) 270px}}@media(max-width:760px){.learn-header{padding:18px 20px}main{padding:15px 20px 45px}.learn-login{grid-template-columns:1fr;gap:25px;margin:10px auto}.learn-intro{position:relative;padding-right:85px}.learn-intro h1{font-size:34px}.learn-intro>img{position:absolute;right:0;bottom:0;width:130px;height:110px;object-fit:contain}.learn-intro>p:not(.eyebrow){font-size:14px}.learn-login-card{padding:25px;border-radius:18px}.learn-login-card h2{font-size:24px}.learn-grid{grid-template-columns:1fr}.learn-welcome{padding:20px 0;flex-wrap:wrap}.learn-welcome h1{font-size:33px}.learn-section-title span{display:none}.learn-player-layout{grid-template-columns:1fr}.learn-player-heading h1{font-size:27px}.learn-player-heading{margin:22px 0}.learn-video-shell{border-radius:10px}.learn-directory{margin-top:5px}.learn-card-cover{height:200px}.learn-empty{padding:30px 20px}}@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}

/* Portrait course artwork, including mobile cards. */
.learn-card-cover{height:auto;aspect-ratio:9/16;width:100%}