:root{color-scheme:light;--brand-green:#174c33;--brand-green-deep:#102f22;--brand-yellow:#f4bc45;--bg:#f7f7f2;--paper:#fffefa;--ink:#192920;--muted:#617067;--line:rgba(25,49,33,.14);--radius:20px;--ease:cubic-bezier(.2,.8,.2,1);font-family:"PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;-webkit-font-smoothing:antialiased}
*{box-sizing:border-box}body{min-height:100vh;margin:0;background:var(--bg);color:var(--ink);display:flex;flex-direction:column}a{color:inherit;text-decoration:none}button,input{font:inherit}button{cursor:pointer}a:focus-visible,button:focus-visible,input:focus-visible{outline:3px solid var(--brand-yellow);outline-offset:3px}
.learner-header{height:82px;padding:0 clamp(22px,5vw,70px);display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);background:rgba(255,254,250,.85)}.learner-brand{display:flex;align-items:center;gap:10px}.learner-brand img{width:40px;height:40px;border-radius:10px;object-fit:cover}.learner-brand strong{font-size:18px;letter-spacing:.03em}.learner-brand span{color:var(--muted);padding-left:12px;margin-left:4px;border-left:1px solid var(--line);font-size:13px}.home-link{font-size:13px;color:var(--brand-green);font-weight:700}.home-link:hover{text-decoration:underline;text-underline-offset:5px}#learnerRoot{flex:1;width:100%}
.login-layout{min-height:calc(100vh - 164px);width:min(1240px,calc(100% - 80px));margin:auto;display:grid;grid-template-columns:1.1fr .9fr;gap:8%;align-items:center;padding:60px 0}.login-intro{position:relative;min-height:510px;display:flex;flex-direction:column;justify-content:center;padding:55px clamp(34px,5vw,74px);overflow:hidden;color:#f8faf4;background:var(--brand-green);border-radius:28px}.login-intro:before,.login-intro:after{content:"";position:absolute;border:1px solid rgba(226,242,217,.2);border-radius:50%;width:410px;height:410px;right:-175px;top:-150px}.login-intro:after{width:270px;height:270px;right:-110px;top:-80px}.intro-kicker,.eyebrow{position:relative;font-size:11px;font-weight:800;letter-spacing:.19em;color:#d8c476}.login-intro h1{position:relative;font-size:clamp(38px,3.8vw,58px);line-height:1.32;letter-spacing:-.05em;margin:28px 0 21px;font-weight:720}.login-intro p:not(.intro-kicker){position:relative;font-size:15px;color:#d5e4d6;line-height:1.9;max-width:500px}.intro-mark{display:block;width:44px;height:2px;border-radius:10px;background:var(--brand-yellow);margin-top:40px}.login-panel{max-width:440px;width:100%;padding:40px 0;background:transparent}.login-panel h2{margin:0 0 8px;font-size:31px;letter-spacing:-.04em}.login-panel>p{color:var(--muted);line-height:1.7;margin:0 0 30px;font-size:14px}.login-panel form{display:grid;gap:18px}.login-panel label{display:grid;gap:8px;font-size:13px;font-weight:700;color:#3b5141}.login-panel input{height:49px;border:1px solid #d3ddd1;border-radius:11px;padding:0 14px;background:var(--paper);color:var(--ink);transition:border-color .2s,box-shadow .2s}.login-panel input:focus{border-color:#2d7a4b;box-shadow:0 0 0 3px rgba(45,122,75,.12);outline:0}.primary-button{min-height:49px;border:0;border-radius:11px;background:var(--brand-green);color:white;font-weight:750;padding:0 20px;transition:transform .22s var(--ease),background .22s var(--ease)}.primary-button:hover{background:#246a42;transform:translateY(-2px)}.primary-button:active{transform:scale(.98)}.primary-button:disabled{opacity:.6;cursor:wait;transform:none}.form-error{min-height:20px;color:#b74f45;font-size:13px;line-height:1.5}.login-footnote{margin:23px 0 0!important;font-size:12px!important;color:#7c8b7e!important}
.library-layout{width:min(1130px,calc(100% - 56px));margin:0 auto;padding:72px 0 110px}.library-top{display:flex;justify-content:space-between;gap:20px;align-items:flex-start}.library-title h1{font-size:clamp(34px,4vw,52px);line-height:1.3;letter-spacing:-.04em;margin:14px 0 10px}.library-title p:last-child{color:var(--muted);font-size:15px}.library-title .eyebrow{color:var(--brand-green)}.logout-button{background:transparent;border:1px solid var(--line);border-radius:10px;padding:11px 16px;color:var(--brand-green);transition:background .2s}.logout-button:hover{background:#e8eee4}.materials{margin-top:52px}.materials h2{font-size:20px;margin:0 0 20px}.material-list{border-top:1px solid var(--line)}.material-item{width:100%;display:flex;gap:28px;justify-content:space-between;align-items:center;text-align:left;padding:24px 4px;border:0;border-bottom:1px solid var(--line);background:transparent;color:var(--ink);transition:padding .22s var(--ease),color .22s}.material-item:hover{color:var(--brand-green);padding-left:12px}.material-item strong,.material-item small{display:block}.material-item strong{font-size:17px;margin-bottom:7px}.material-item small{font-size:13px;color:var(--muted);line-height:1.6}.material-item>span:last-child{font-size:23px}.empty-library{padding:70px 30px;text-align:center;background:#e9eee4;border-radius:22px}.empty-library strong{font-size:22px}.empty-library p{color:var(--muted);line-height:1.8;margin:12px 0 0}.viewer{margin-top:0}.back-button{background:none;border:0;padding:0;color:var(--brand-green);font-weight:700;margin-bottom:22px}.viewer h2{font-size:29px;margin:0 0 14px}.viewer-summary{color:var(--muted);line-height:1.8}.viewer video{display:block;width:100%;max-height:70vh;background:#101c14;border-radius:15px;margin-top:24px}.article-body{white-space:pre-wrap;font-size:16px;line-height:2.1;max-width:850px;margin-top:25px}.viewer-note{font-size:12px;color:#839083;margin-top:20px;line-height:1.8}.learner-footer{min-height:82px;padding:20px clamp(22px,5vw,70px);display:flex;gap:16px;align-items:center;justify-content:space-between;border-top:1px solid var(--line);font-size:12px;color:#849086}.learner-footer a{text-decoration:underline;text-underline-offset:3px}
@media(max-width:900px){.login-layout{gap:5%;width:calc(100% - 48px)}.login-intro{min-height:460px}.login-panel{padding:30px 0}}
@media(max-width:760px){.learner-header{height:70px;padding:0 20px}.learner-brand img{width:36px;height:36px}.learner-brand strong{font-size:16px}.learner-brand span{font-size:11px;padding-left:8px}.login-layout{display:flex;flex-direction:column;align-items:stretch;gap:30px;width:calc(100% - 40px);padding:24px 0 52px}.login-intro{min-height:310px;padding:32px 28px;border-radius:20px}.login-intro h1{font-size:clamp(30px,7vw,42px);margin:22px 0 12px}.login-intro p:not(.intro-kicker){font-size:13px}.intro-mark{margin-top:20px}.login-panel{max-width:none;padding:0 3px}.login-panel h2{font-size:26px}.library-layout{width:calc(100% - 40px);padding-top:50px}.library-top{display:block}.logout-button{margin-top:14px}.learner-footer{display:block;line-height:2}.learner-footer a{display:block}}
@media(max-width:360px){.learner-brand span{display:none}.login-intro{padding:26px 22px}.login-intro h1{font-size:29px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition-duration:.001ms!important;animation-duration:.001ms!important}}