:root{--brand-mark-color: #ECD0B5;--login-primary-color: #34333b;--login-panel-bg: rgba(232, 231, 236, .8);--course-sidebar-bg: #4a4c4f;--course-sidebar-width: 280px;--viewport-height: 100vh;--viewport-height: 100dvh;--homepage-cards-collapse-width: 900px;--homepage-shell-collapse-width: 1188px;--homepage-sidebar-reserve: 220px;--homepage-sidebar-cards-gap: 36px}*{box-sizing:border-box;margin:0;padding:0}body{font-family:Microsoft YaHei,微软雅黑,Helvetica Neue,Helvetica,Arial,sans-serif;margin:0;padding:0;background-color:var(--course-sidebar-bg);color:#fff;overflow:hidden;user-select:none;-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;-webkit-touch-callout:none}img,video{-webkit-user-drag:none;user-drag:none}*{user-select:none;-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none}a{text-decoration:none;color:inherit}.homepage{position:relative;display:flex;flex-direction:column;width:100%;max-width:100vw;--homepage-layout-height: 100dvh;--homepage-vh: calc(var(--homepage-layout-height) / 100);height:var(--homepage-layout-height);max-height:var(--homepage-layout-height);min-height:var(--homepage-layout-height);overflow:hidden;background-color:var(--course-sidebar-bg)}.content-wrapper{position:relative;display:flex;flex-direction:column;justify-content:center;align-items:center;flex:1;min-height:0;width:100%;max-width:100%;margin:0 auto;padding:30px;gap:0;overflow:hidden;container-type:inline-size;container-name:homepage-shell}.homepage-main-unit{display:flex;flex-direction:column;align-items:center;width:100%;max-width:100%;margin-left:auto;margin-right:auto;position:relative;min-width:0}.homepage-unit-core{display:flex;flex-direction:row;align-items:center;justify-content:center;gap:var(--homepage-core-gap, 5vw);width:100%;position:relative}.homepage-cards-column{display:flex;flex-direction:column;align-items:center;flex-shrink:0;min-width:0;width:var(--homepage-cards-row-width, auto);margin-left:var(--homepage-cards-margin-left, 0)}.homepage-footer{position:static;width:100%;margin-top:clamp(12px,calc(var(--homepage-vh) * 2),18px);text-align:right;align-items:flex-end;z-index:10;pointer-events:none}.homepage-footer.footer{box-sizing:border-box;width:100%;max-width:100%;align-items:flex-end}.homepage-footer.footer p{align-self:flex-end;text-align:right}.homepage-sidebar-zone{position:relative;height:var(--homepage-card-height);display:flex;align-items:center;z-index:30;flex-shrink:0;overflow:visible;pointer-events:none}.homepage-main-unit--narrow .homepage-sidebar-zone{position:fixed;left:0;top:50%;width:0;height:0;transform:translateY(-50%)}.homepage-sidebar-toggle{position:fixed;top:clamp(12px,calc(var(--homepage-vh) * 2.5),28px);left:30px;z-index:35;padding:8px 14px;border:none;border-radius:8px;background:#00000047;color:#f5f2ed;font-family:Microsoft YaHei,微软雅黑,sans-serif;font-size:.85rem;cursor:pointer;transition:background .2s ease;outline:none}.homepage-sidebar-toggle:hover,.homepage-sidebar-toggle--active{background:#0000006b}.homepage-sidebar-zone--drawer:before{display:none}.homepage--cards-narrow.homepage--sidebar-open:after{content:"";position:fixed;top:0;right:0;bottom:0;left:0;z-index:20;background:#00000059;pointer-events:none}.sidebar,.left-sidebar{flex:0 0 auto;flex-shrink:0;width:clamp(220px,16vw,280px);min-width:220px;max-height:calc(var(--homepage-layout-height) - clamp(24px,calc(var(--homepage-vh) * 5),56px));display:flex;flex-direction:column;justify-content:center;align-items:flex-start;overflow:visible;transition:transform .35s cubic-bezier(.4,0,.2,1);min-height:var(--homepage-card-height);height:max-content}.homepage-sidebar-zone .left-sidebar{position:relative;left:auto;top:auto;pointer-events:auto;transform:translate(var(--homepage-sidebar-translate-x, 0))}.homepage-main-unit--narrow .homepage-sidebar-zone 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5),80px)}.brand-container{display:flex;flex-direction:column;align-items:flex-start}.brand-mark{width:clamp(80px,calc(var(--homepage-vh) * 11),120px);height:clamp(100px,calc(var(--homepage-vh) * 14),150px);margin-bottom:clamp(8px,calc(var(--homepage-vh) * 1.2),15px);margin-left:-12px;flex-shrink:0}.brand-mark .lottie-animation{width:100%;height:100%}.brand-title{font-family:Times New Roman,Times,serif;font-size:clamp(.85rem,calc(var(--homepage-vh) * 1.4),1.1rem);font-weight:400;line-height:1.4;color:var(--brand-mark-color);letter-spacing:.5px;white-space:nowrap}.nav-list{display:flex;flex-direction:column;gap:clamp(12px,calc(var(--homepage-vh) * 2),24px)}.nav-item-wrapper{display:flex;flex-direction:column;gap:clamp(6px,calc(var(--homepage-vh) * 1),10px)}.nav-item{display:flex;flex-direction:column;gap:4px;transition:opacity .3s ease;opacity:1;white-space:nowrap}.nav-separator{display:block;width:min(220px,100%);height:2px;opacity:1;margin:clamp(4px,calc(var(--homepage-vh) * .8),8px) 0 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