:root{--c-primary: #1677ff;--c-primary-dark: #0958d9;--c-primary-light: rgba(22, 119, 255, .1);--c-success: #52c41a;--c-warning: #faad14;--c-error: #ff4d4f;--c-bg-page: #f5f7fa;--c-bg-card: #ffffff;--c-bg-elevated: #ffffff;--c-border: #f0f0f0;--c-text: #333;--c-text-secondary: #666;--c-text-tertiary: #999;--c-header-bg: #ffffff;--c-header-border: #f0f0f0;--c-footer-bg: #fafafa;--c-footer-text: #999;--r-small: 8px;--r-card: 12px;--r-large: 16px;--r-pill: 20px;--shadow-card: 0 2px 8px rgba(0,0,0,.06);--shadow-hover: 0 4px 16px rgba(0,0,0,.08);--w-content: 960px;--w-detail: 800px;--w-article: 720px;--c-hero-1: #667eea;--c-hero-2: #764ba2;--hero-height: 200px;--c-bottom-bg: rgba(255,255,255,.92);--c-bottom-shadow: rgba(22, 119, 255, .18);--c-bottom-border: rgba(22, 119, 255, .18);--c-article: #1677ff;--c-article-bg: #e6f4ff;--c-video: #52c41a;--c-video-bg: #f6ffed;--c-audio: #fa8c16;--c-audio-bg: #fff7e6;--c-document: #722ed1;--c-document-bg: #f9f0ff;--c-videoab: #13c2c2;--c-videoab-bg: #e6fffb;--card-gap: 16px;--doc-iframe-height: 70vh;--doc-iframe-radius: 8px;--article-line-height: 1.75}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,Noto Sans,PingFang SC,Microsoft YaHei,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background:var(--c-bg-page)}.protected-content{-webkit-user-select:none;user-select:none;-webkit-touch-callout:none}.protected-content iframe{pointer-events:auto}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-thumb{background:var(--c-text-tertiary);border-radius:3px}::-webkit-scrollbar-track{background:transparent}.hero-announcement-content p{margin:4px 0}.hero-announcement-content img{max-height:60px;width:auto;border-radius:4px;vertical-align:middle}.hero-announcement-content a{text-decoration:underline}.hero-announcement-content h1{font-size:18px;font-weight:700;margin:6px 0 4px}.hero-announcement-content h2{font-size:16px;font-weight:700;margin:6px 0 4px}.hero-announcement-content h3{font-size:15px;font-weight:600;margin:4px 0 2px}.hero-announcement-content ul,.hero-announcement-content ol{margin:4px 0;padding-left:20px}.hero-announcement-content ul{list-style:disc}.hero-announcement-content ol{list-style:decimal}.ant-slider .ant-slider-mark-text{font-size:11px;font-weight:700}.dictation-textarea::placeholder{color:var(--c-text-tertiary);line-height:1.6}.dictation-correct{color:#52c41a!important;background:#52c41a1a!important}.dictation-wrong{color:#ff4d4f!important;background:#ff4d4f1a!important}.dictation-missed{color:#999!important;background:#0000000a!important;text-decoration:line-through}.hero-announcement-content blockquote{border-left:3px solid rgba(255,255,255,.5);padding:2px 10px;margin:4px 0;border-radius:0 6px 6px 0}.hero-announcement-content code{background:#0003;padding:1px 4px;border-radius:3px;font-size:.9em}.hero-announcement-content table{border-collapse:collapse;margin:4px 0}.hero-announcement-content th,.hero-announcement-content td{border:1px solid rgba(255,255,255,.3);padding:4px 8px}.slick-slide .announcement-content,.slick-slide .announcement-content *{color:#ffffffeb!important}.slick-slide .announcement-content a{text-decoration:underline!important;color:#fff!important}.slick-slide .announcement-content img{max-height:60px!important;width:auto!important;border-radius:4px!important;vertical-align:middle;margin:0 4px!important}.announcement-content img,.article-detail-content img{max-width:100%;border-radius:8px;margin:8px 0}.announcement-content a,.article-detail-content a{color:var(--c-primary);text-decoration:underline}.announcement-content h1,.article-detail-content h1{font-size:24px;font-weight:700;margin:16px 0 8px}.announcement-content h2,.article-detail-content h2{font-size:20px;font-weight:700;margin:14px 0 8px}.announcement-content h3,.article-detail-content h3{font-size:18px;font-weight:600;margin:12px 0 6px}.announcement-content p,.article-detail-content p{margin:8px 0}.announcement-content ul,.article-detail-content ul{margin:8px 0;padding-left:24px;list-style:disc}.announcement-content ol,.article-detail-content ol{margin:8px 0;padding-left:24px;list-style:decimal}.announcement-content blockquote,.article-detail-content blockquote{border-left:4px solid var(--c-primary);padding:4px 12px;margin:8px 0;color:#666;background:var(--c-primary-light);border-radius:0 8px 8px 0}.announcement-content table,.article-detail-content table{width:100%;border-collapse:collapse;margin:8px 0}.announcement-content th,.announcement-content td,.article-detail-content th,.article-detail-content td{border:1px solid #e5e7eb;padding:8px 12px;text-align:left}.announcement-content th,.article-detail-content th{background:var(--c-bg-elevated);font-weight:600}.announcement-content code,.article-detail-content code{background:#f3f4f6;padding:2px 6px;border-radius:4px;font-family:Consolas,Monaco,monospace;font-size:.9em}.announcement-content pre,.article-detail-content pre{background:#1e1e1e;color:#e6e6e6;padding:12px 16px;border-radius:8px;overflow-x:auto;margin:8px 0}.announcement-content pre code,.article-detail-content pre code{background:none;padding:0;color:inherit}.hover-lift{transition:transform .25s,box-shadow .25s}.hover-lift:hover{transform:var(--card-hover-transform, translateY(-4px));box-shadow:var(--shadow-hover)}.hover-zoom{transition:transform .25s}.hover-zoom:hover{transform:var(--card-hover-transform, scale(1.05))}.hover-glow{transition:box-shadow .25s}.hover-glow:hover{box-shadow:var(--card-hover-shadow, 0 0 20px var(--c-primary-light))}.article-detail-content{max-width:var(--w-article);line-height:var(--article-line-height)}.show-on-mobile{display:none!important}.category-sidebar{position:sticky;top:72px}.category-sidebar .ant-card-head{min-height:44px;padding:0 16px}.category-sidebar .ant-card-head-title{font-size:15px;font-weight:600}.category-sidebar .ant-card-body{padding:12px 8px}.category-tree .ant-tree-node-content-wrapper{font-size:14px!important;padding:6px 10px!important;border-radius:8px!important;transition:all .2s!important;min-height:36px;display:flex;align-items:center}.category-tree .ant-tree-node-content-wrapper:hover{background:var(--c-primary-light)!important}.category-tree .ant-tree-node-selected,.category-tree .ant-tree-treenode-selected .ant-tree-node-content-wrapper{background:var(--c-primary)!important;color:#fff!important;font-weight:600}.category-tree .ant-tree-treenode-selected .ant-tree-node-content-wrapper:hover{background:var(--c-primary-dark)!important}.category-tree .ant-tree-switcher{width:20px}.category-tree .ant-tree-list-holder-inner{gap:2px}.category-drawer-trigger{display:inline-flex;align-items:center;gap:8px;padding:8px 16px;border-radius:var(--r-card);border:1px solid var(--c-border);background:var(--c-bg-elevated);font-size:14px;font-weight:500;color:var(--c-text);cursor:pointer;transition:all .2s;margin-bottom:16px;-webkit-user-select:none;user-select:none}.category-drawer-trigger:hover{border-color:var(--c-primary);color:var(--c-primary)}.list-page-toolbar{position:sticky;top:56px;z-index:90;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:8px;margin-bottom:20px;padding:10px 14px;background:var(--c-bg-card);border:1px solid var(--c-border);border-radius:var(--r-card);box-shadow:var(--shadow-card)}.list-page-toolbar .category-drawer-trigger{margin-bottom:0;border:none;background:transparent;padding:6px 8px}.category-drawer-trigger .anticon{font-size:16px}.category-drawer-trigger-label{font-weight:600}.category-drawer-trigger-label:after{content:"";display:inline-block;width:1px;height:12px;background:var(--c-border);margin-left:8px;vertical-align:middle}@media(min-width:1025px){.category-drawer-root.ant-drawer-left>.ant-drawer-content-wrapper{left:calc((100vw - var(--w-content)) / 2)!important}}.category-all-btn{display:flex;align-items:center;gap:8px;padding:8px 10px;border-radius:8px;font-size:14px;font-weight:500;color:var(--c-text);cursor:pointer;transition:all .2s;margin-bottom:4px}.category-all-btn:hover{background:var(--c-primary-light);color:var(--c-primary)}.category-all-btn.active{background:var(--c-primary);color:#fff;font-weight:600}.list-page-header{display:flex;align-items:center;gap:14px;margin-bottom:20px;padding:18px 20px;border-radius:var(--r-large);border:1px solid var(--c-border);box-shadow:var(--shadow-card)}.list-page-header-icon-wrap{width:52px;height:52px;border-radius:16px;display:flex;align-items:center;justify-content:center;background:#fffc;border:1px solid rgba(127,127,127,.12);box-shadow:0 2px 8px #0000000d;flex-shrink:0}.list-page-header-icon{font-size:26px;line-height:1}.list-page-header-title{font-size:22px;font-weight:700;margin:0;line-height:1.2}.list-page-header-desc{font-size:13px;color:var(--c-text-secondary);margin:2px 0 0}.list-empty-state{text-align:center;padding:60px 20px;color:var(--c-text-tertiary)}.list-empty-state .anticon{font-size:48px;margin-bottom:12px;display:block}@media(max-width:1024px){:root{--w-content: 100%}}@media(max-width:768px){:root{--w-content: 100%;--w-detail: 100%;--w-article: 100%;--card-gap: 12px;--r-card: 10px;--r-large: 12px;--hero-height: 160px;--doc-iframe-height: 60vh;--article-line-height: 1.7}.hide-on-mobile{display:none!important}.show-on-mobile{display:flex!important}.main-header-inner{padding:0 12px!important}.category-sidebar{position:static!important}.main-content{padding:16px 12px 0!important}.main-logo{font-size:16px!important}.main-username{display:none!important}.article-detail-content h1{font-size:20px!important}.article-detail-content h2{font-size:18px!important}.article-detail-content h3{font-size:16px!important}.article-detail-content img{max-height:240px!important}.slick-slide .announcement-content img{max-height:48px!important}.ant-table-wrapper{overflow-x:auto}.ant-modal{max-width:calc(100vw - 16px)!important;margin:8px auto!important}.ant-modal .ant-modal-body{max-height:calc(100vh - 120px);overflow-y:auto;-webkit-overflow-scrolling:touch}.ant-layout-header{padding:0 12px!important}.admin-back-btn span:not(.anticon){display:none!important}.vip-level-card-row{flex-direction:column!important;align-items:stretch!important;gap:8px!important}.vip-level-card-row>.ant-space{width:100%!important;justify-content:space-between!important}.vip-level-card-row .ant-input-number{width:120px!important}.vip-level-card-row .vip-duration-hint{display:none!important}.request-history-drawer.ant-drawer .ant-drawer-content-wrapper{width:100%!important}}@media(max-width:480px){:root{--hero-height: 140px}.main-content{padding:12px 8px 0!important}.main-header-inner{padding:0 8px!important}}.auth-shell{min-height:100vh;min-height:100dvh}@media(max-width:768px){.auth-shell{align-items:flex-start!important;padding-top:8vh!important}}.category-courses-container{display:flex;flex-direction:column;gap:16px}.category-toolbar-action{background:none;border:1px solid var(--c-border);border-radius:var(--r-small);padding:3px 12px;font-size:13px;color:var(--c-primary);cursor:pointer;white-space:nowrap;transition:all .2s}.category-toolbar-action:hover{border-color:var(--c-primary);background:var(--c-primary-light)}.category-course-section{background:var(--c-bg-card);border:1px solid var(--c-border);border-radius:var(--r-card);box-shadow:var(--shadow-card);overflow:hidden}.category-course-section-header{display:flex;align-items:center;gap:10px;padding:14px 16px;cursor:pointer;-webkit-user-select:none;user-select:none;border-left:3px solid transparent;transition:background .2s}.category-course-section-header:hover{background:var(--c-bg-page)}.category-course-section-caret{color:var(--c-text-tertiary);font-size:12px;display:inline-flex;align-items:center;transition:transform .25s ease;flex-shrink:0}.category-course-section-header.collapsed .category-course-section-caret{transform:rotate(-90deg)}.category-course-section-icon{font-size:20px;line-height:1;flex-shrink:0}.category-course-section-title{font-size:17px;font-weight:600;margin:0;color:var(--c-text);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;flex:1;min-width:0}.category-course-section-more{font-size:13px;color:var(--c-primary);white-space:nowrap;display:inline-flex;align-items:center;gap:3px;transition:color .2s;flex-shrink:0;text-decoration:none}.category-course-section-more:hover{color:var(--c-primary-dark)}.category-course-section-body-inner{animation:category-section-in .28s ease;padding:4px 16px 16px}@keyframes category-section-in{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}.category-course-subsection{margin-top:14px}.category-course-subsection+.category-course-subsection{margin-top:10px}.category-course-subsection .category-course-subsection{margin-left:14px}.category-course-subsection-header{display:flex;align-items:center;gap:8px;padding:8px 12px;margin-bottom:10px;border-radius:var(--r-small);background:var(--c-bg-page);border:1px solid var(--c-border);border-left:3px solid transparent;cursor:pointer;-webkit-user-select:none;user-select:none;transition:background .2s}.category-course-subsection-header:hover{background:var(--c-bg-elevated)}.category-course-subsection-header.collapsed .category-course-section-caret{transform:rotate(-90deg)}.category-course-subsection-icon{font-size:16px;line-height:1;flex-shrink:0}.category-course-subsection-title{font-size:14px;font-weight:600;margin:0;color:var(--c-text);flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.category-course-subsection-body{padding-left:4px}@media(max-width:768px){.videoab-detail-header{flex-direction:column;align-items:flex-start!important}}@media(max-width:768px){.appearance-preview-panel{display:none!important}}@keyframes chatPulse{0%,to{box-shadow:0 6px 18px #1677ff73}50%{box-shadow:0 6px 22px #1677ffbf,0 0 0 8px #1677ff1f}}@media(max-width:768px){.admin-content .ant-card-body{padding:14px!important}.admin-content .ant-input,.admin-content .ant-input-number,.admin-content .ant-input-affix-wrapper,.admin-content .ant-input-group-wrapper,.admin-content .ant-input-search,.admin-content .ant-select,.admin-content .ant-picker,.admin-content .ant-input-number-group-wrapper{max-width:100%!important}.admin-grid-2col{grid-template-columns:1fr!important}}@media(max-width:768px){.list-page-header{padding:14px;gap:12px}.list-page-header-icon-wrap{width:44px;height:44px;border-radius:13px}.list-page-header-title{font-size:19px}.list-page-toolbar{padding:8px 10px}.category-course-section-header{padding:12px;gap:8px}.category-course-section-body-inner{padding:2px 12px 12px}.category-course-section-title{font-size:15px}.category-course-subsection-header{padding:6px 10px}}@media(max-width:768px){.rte-scroll-grow{min-height:320px}.rte-scroll-grow .w-e-text-container{height:auto!important;min-height:320px}.rte-scroll-grow .w-e-text-container .w-e-scroll{height:auto!important;min-height:320px;overflow:visible!important}}.rte-fullscreen .w-e-text-container{height:100%!important}.rte-fullscreen .w-e-text-container .w-e-scroll{height:100%!important;overflow-y:auto!important;-webkit-overflow-scrolling:touch}.rte-fullscreen .w-e-toolbar{flex-wrap:wrap;flex-shrink:0;overflow:visible}@media(max-width:768px){.rte-fullscreen{max-width:100%!important}}