:root{font-family:"Microsoft YaHei","PingFang SC",sans-serif;color:#233d4d;background:#f3f6fa;font-synthesis:none;letter-spacing:0;--line:#dce4ea;--muted:#6b7d89;--accent:#087daa}
*{box-sizing:border-box}body{margin:0}a{color:inherit;text-decoration:none}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button,a{touch-action:manipulation}button{cursor:pointer}button:disabled{cursor:default}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #e9b83c;outline-offset:3px}[hidden]{display:none!important}
.library-header{background:#fff;border-bottom:1px solid var(--line)}.header-inner{max-width:1512px;min-height:76px;margin:auto;padding:12px 28px;display:flex;gap:24px;align-items:center}.library-brand img{width:176px;height:auto;display:block}.header-label{font-size:14px;border-left:1px solid var(--line);padding-left:24px}.library-nav{margin-left:auto;display:flex;gap:22px;align-items:center;font-size:13px}.library-nav a:hover{color:var(--accent)}.account-name{font-size:12px;color:var(--muted);max-width:150px;overflow-wrap:anywhere}.library-main{max-width:1512px;margin:auto;padding:30px 28px 48px}.library-heading{display:flex;justify-content:space-between;gap:20px;align-items:center;margin-bottom:24px}.library-heading h1{font-size:28px;font-weight:600;line-height:1.4;margin:0 0 7px}.library-heading p{color:var(--muted);margin:0;font-size:13px}.search-field{width:300px;min-width:0;position:relative;display:block}.search-field img{position:absolute;left:12px;top:12px;width:18px;height:18px;pointer-events:none}.search-field input{width:100%;height:42px;border:1px solid var(--line);border-radius:4px;padding:0 12px 0 40px;background:#fff;color:inherit;font-size:14px}.subject-tabs{display:flex;gap:24px;overflow-x:auto;border-bottom:1px solid var(--line);scrollbar-width:thin}.subject-tabs button{flex:none;background:none;border:0;border-bottom:3px solid transparent;padding:12px 0 13px;font-size:14px;color:var(--muted)}.subject-tabs button[aria-pressed=true]{border-color:var(--accent);color:var(--accent);font-weight:600}.library-filters{display:flex;gap:12px;flex-wrap:wrap;align-items:center;padding:17px 0 22px}.library-filters label{display:flex;gap:8px;align-items:center;font-size:12px;color:var(--muted)}.library-filters select{max-width:200px;min-width:108px;height:34px;background:#fff;border:1px solid var(--line);border-radius:4px;color:#314e60;padding:0 28px 0 10px;font-size:13px}.catalog-count{font-size:12px;color:var(--muted);margin-left:auto}.course-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px 20px}.course-card{display:block;background:#fff;border-radius:4px;overflow:hidden;border:1px solid transparent;transition:border-color .15s}.course-card:hover{border-color:#6eafc5}.course-cover{aspect-ratio:16/9;overflow:hidden;background:#e3edf2}.course-cover img{width:100%;height:100%;object-fit:cover;display:block}.course-caption{padding:13px 14px 12px;min-height:78px}.course-caption h2{font-size:19px;line-height:1.4;font-weight:500;margin:0 0 4px;overflow-wrap:anywhere}.course-caption .number{color:#647b89;font-size:16px;margin-right:9px;font-variant-numeric:tabular-nums}.course-caption p{color:var(--muted);font-size:12px;margin:0;line-height:1.6;display:flex;justify-content:space-between;gap:8px}.course-caption .course-extra{display:block;font-size:12px;color:var(--muted);margin-top:3px}.catalog-message{padding:52px 16px;text-align:center;color:var(--muted);font-size:14px;border-top:1px solid var(--line);line-height:1.8}.text-button,.pagination button{border:1px solid var(--line);background:#fff;border-radius:4px;padding:9px 16px;color:#314e60;font-size:13px}.text-button:hover{border-color:var(--accent)}.catalog-error{background:#fff6ef;padding:14px 16px;color:#854a29;display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:18px;font-size:13px}.pagination{display:flex;justify-content:center;align-items:center;gap:18px;margin-top:26px;font-size:13px}.pagination button:disabled{opacity:.4}.course-back{display:inline-flex;align-items:center;gap:6px;margin:0 0 22px;font-size:13px;color:var(--muted)}.course-back img{width:18px;height:18px}.detail-heading{display:grid;grid-template-columns:220px minmax(0,1fr);gap:24px;align-items:center;margin-bottom:26px}.detail-heading>img{width:100%;aspect-ratio:16/9;object-fit:cover;border-radius:4px}.detail-heading h1{font-size:26px;line-height:1.5;margin:6px 0 8px;overflow-wrap:anywhere}.detail-heading p{font-size:13px;color:var(--muted);margin:0;line-height:1.8}.lesson-toolbar{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:14px}.lesson-toolbar h2{font-size:18px;font-weight:500}.lesson-list{border-top:1px solid var(--line)}.lesson-row{display:grid;grid-template-columns:42px minmax(0,1fr) auto;align-items:center;gap:16px;padding:18px 4px;border-bottom:1px solid var(--line)}.lesson-number{color:#78909e;font-size:13px;font-variant-numeric:tabular-nums}.lesson-row h3{font-size:15px;font-weight:500;margin:0 0 4px;overflow-wrap:anywhere}.lesson-row p{font-size:12px;color:var(--muted);margin:0}.lesson-open{display:flex;align-items:center;gap:8px;border:1px solid var(--line);padding:9px 13px;background:#fff;border-radius:4px;font-size:13px;white-space:nowrap}.lesson-open img{width:16px;height:16px}.lesson-disabled{font-size:12px;color:var(--muted)}.library-footer{margin-top:36px;padding-top:16px;border-top:1px solid var(--line);color:var(--muted);font-size:12px}
@media(min-width:1600px){.course-caption h2{font-size:21px}}
.header-inner,.library-nav{flex-wrap:wrap}.library-brand,.header-label{flex-shrink:0}.library-nav a{white-space:nowrap}.library-nav .scratch-link{display:inline-flex;align-items:center;gap:5px;color:var(--accent)}.scratch-link img{width:15px;height:15px}
@media(max-width:1000px){.header-label,.account-name{display:none}.course-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.library-heading h1{font-size:24px}.search-field{width:250px}.library-nav{gap:16px}}
@media(max-width:600px){.header-inner{padding:12px 16px;gap:12px;flex-wrap:wrap}.library-brand img{width:142px}.library-nav{font-size:12px;gap:12px;flex-wrap:wrap}.library-main{padding:24px 16px 32px}.library-heading{display:block;margin-bottom:14px}.library-heading h1{font-size:23px}.search-field{width:100%;margin-top:18px}.subject-tabs{gap:22px}.library-filters{gap:10px;padding:14px 0}.library-filters label{flex:1;min-width:44%}.library-filters select{min-width:0;width:100%;max-width:none}.catalog-count{width:100%;text-align:right}.course-grid{grid-template-columns:1fr;gap:18px}.course-caption h2{font-size:19px}.course-caption{min-height:76px}.detail-heading{grid-template-columns:1fr;gap:14px}.detail-heading>img{max-width:100%}.detail-heading h1{font-size:23px}.lesson-toolbar{display:block}.lesson-toolbar .search-field{margin-top:10px}.lesson-row{gap:8px;grid-template-columns:28px minmax(0,1fr) auto}.lesson-open{padding:8px;font-size:12px}.lesson-open img{display:none}}
.library-filters label{white-space:nowrap}.library-filters select{min-width:0;flex:1}.library-main{padding-bottom:64px}
.cpp-categories{display:flex;gap:8px;flex-wrap:wrap;padding:18px 0 0}.cpp-categories button{border:1px solid var(--line);border-radius:4px;background:#fff;color:#496170;padding:9px 16px;font-size:13px}.cpp-categories button[aria-pressed=true]{background:#087daa;border-color:#087daa;color:#fff}.cpp-category-section{margin-bottom:38px}.cpp-category-heading{display:flex;align-items:center;gap:12px;padding:0 0 12px;border-bottom:2px solid #bfdae5}.cpp-category-heading h2{font-size:21px;margin:0;font-weight:600}.cpp-category-heading>span,.cpp-package-heading>span{font-size:12px;color:var(--muted)}.cpp-package-section{margin-top:22px}.cpp-package-heading{display:flex;align-items:baseline;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-bottom:12px}.cpp-package-heading h3{margin:0;font-size:17px;font-weight:600;overflow-wrap:anywhere}.cpp-package-section .course-caption h4{font-size:19px;line-height:1.4;font-weight:500;margin:0 0 4px;overflow-wrap:anywhere}
@media(max-width:600px){.cpp-categories button{padding:9px 13px}.cpp-category-heading h2{font-size:19px}.cpp-package-heading h3{font-size:16px}.cpp-package-section .course-caption h4{font-size:18px}}
@media(prefers-reduced-motion:reduce){*{transition:none!important}}
.library-nav { flex-wrap: wrap; justify-content: flex-end; row-gap: 10px; }