/* 自由树水晶玻璃：与已确认的登录页共享颜色与材质。 */
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h3{font-size:21px}pre{padding:16px;font-size:13px}.recipe-check{padding:14px}.recipe-nav{padding:17px 20px}.next-stop{gap:16px}.breadcrumbs{padding:18px 0}.table-wrap{margin-bottom:20px}th,td{padding:10px 12px}.quick-links{gap:15px;font-size:12px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}
/* 彩色积木画布：保持原始字号，窄屏横向查看，不将文字压缩到不可读。 */
.block-figure{margin:24px 0;border:1px solid #424558;border-radius:13px;background:#292b36;overflow:hidden}.diagram-toolbar{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 14px;border-bottom:1px solid #464958;color:#d8ddec;font-size:13px}.diagram-toolbar>div{display:flex;gap:5px;flex-wrap:wrap}.diagram-toolbar button{border:1px solid #626780;background:#343848;color:#eef0ff;padding:5px 9px;border-radius:6px;font-size:12px;min-height:32px}.diagram-toolbar button:hover{background:#495169}.diagram-viewport{overflow:auto;max-height:900px;padding:5px;overscroll-behavior:contain}.diagram-viewport svg{display:block;max-width:none;height:auto;transform-origin:0 0}.block-figure figcaption{padding:10px 16px;color:#c3c7d4;font-size:12px;border-top:1px solid #404452}.diagram-text{margin:-12px 0 25px;padding:13px 17px;border:1px solid var(--line);border-radius:8px;color:var(--muted);font-size:13px}.diagram-text .lesson-code-wrap{margin:14px 0 0}.diagram-legend{display:flex;flex-wrap:wrap;gap:15px;font-size:12px;color:var(--muted);margin:16px 0}.diagram-legend span:before{content:"";display:inline-block;width:12px;height:12px;border-radius:3px;background:var(--swatch);margin-right:6px}.block-photo-section{margin:24px 0}.block-photo-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.block-photo-grid figure{margin:0;border:1px solid var(--line);border-radius:10px;overflow:hidden;background:var(--panel)}.block-photo-grid img{display:block;width:100%;max-height:300px;object-fit:contain;background:#292b36}.block-photo-grid figcaption{font-size:12px;padding:12px;color:var(--muted)}.diagram-dialog{width:96vw;max-width:1600px;max-height:94vh;padding:0;border:1px solid #646a82;border-radius:12px;background:#292b36;color:#fff}.diagram-dialog::backdrop{background:#07090de6}.diagram-dialog .diagram-viewport{max-height:80vh}.diagram-dialog-header{display:flex;align-items:center;justify-content:space-between;padding:12px 18px;background:#343848}.diagram-dialog-header button{background:#4c546e;color:white;border:0;border-radius:5px;padding:8px 15px}.diagram-caption{color:var(--muted);font-size:13px}.diagram-viewport:focus-visible{outline:2px solid var(--mint);outline-offset:-3px}@media(max-width:720px){.diagram-toolbar{display:block}.diagram-toolbar>div{margin-top:9px}.diagram-toolbar>span{font-size:13px}.diagram-viewport{max-height:680px}.block-photo-grid{grid-template-columns:1fr}.diagram-dialog{width:98vw}.block-figure{margin-left:0;margin-right:0}}
/* 图标形状与用户提供的积木分类一致。 */
.diagram-legend span:before{width:23px;height:15px;border-radius:9px;vertical-align:-3px;font:bold 11px/15px monospace;text-align:center;color:#142420}.diagram-legend [data-block-kind="event"]:before{height:19px;clip-path:polygon(0 30%,20% 30%,25% 5%,50% 0,70% 30%,100% 30%,100% 85%,62% 85%,52% 100%,35% 85%,0 85%)}.diagram-legend [data-block-kind="control"]:before{border-radius:4px;clip-path:polygon(0 0,100% 0,100% 32%,27% 32%,27% 75%,64% 75%,64% 100%,0 100%)}.diagram-legend [data-block-kind="condition"]:before{content:"?";clip-path:polygon(22% 0,78% 0,100% 50%,78% 100%,22% 100%,0 50%)}.diagram-legend [data-block-kind="value"]:before{content:"{ }"}.diagram-legend [data-block-kind="variable"]:before{content:"↔"}.diagram-legend [data-block-kind="custom"]:before{border-radius:1px;clip-path:polygon(34% 0,66% 0,66% 30%,100% 30%,100% 70%,66% 70%,66% 100%,34% 100%,34% 70%,0 70%,0 30%,34% 30%)}.block-kind[data-kind="事件"]{background:#3c321b;color:#ffc84c}.block-kind[data-kind="动作"]{background:#1d3049;color:#77b3ff}.block-kind[data-kind="控制"]{background:#32223f;color:#bf8bff}.block-kind[data-kind="条件"]{background:#412d24;color:#ffac72}.block-kind[data-kind="取值"]{background:#203b2d;color:#73e9ac}
.diagram-save{font-size:12px;color:#a9e6c4;text-decoration:underline;padding:5px 8px;align-self:center}
.diagram-dialog{max-width:min(96vw,1600px)}
.editor-photo .diagram-toolbar a{display:inline-flex;align-items:center;border:1px solid #626780;background:#343848;color:#eef0ff;padding:5px 9px;border-radius:6px;font-size:12px;min-height:32px;text-decoration:none}.editor-photo .diagram-toolbar a:hover{background:#495169}.editor-photo-preview{display:block;overflow:hidden;background:#292b36}.editor-photo-preview img{display:block;width:100%;height:auto;aspect-ratio:2.15;object-fit:cover;object-position:top}.editor-photo-preview:focus-visible{outline:2px solid var(--mint);outline-offset:-3px}


/* Shared learning layouts. Palette and materials follow the crystal design below. */

html{scroll-padding-top:112px}body{background:var(--panel);line-height:1.8}h1,h2,h3{letter-spacing:0;text-wrap:balance;font-weight:750}h1{font-size:38px;line-height:1.45}h2{font-size:30px;line-height:1.5}h3{font-size:20px}strong{font-weight:700}.hero-friends svg,.learning-strip svg,.play-icon svg,.topic-icon svg,.note-tip svg,.search-dock svg{width:24px;height:24px;flex-shrink:0}::selection{background:var(--panel2);color:#245409}.shell{max-width:1180px;padding-inline:32px}a:hover{color:var(--mint)}:focus-visible{outline:3px solid #1479a8;outline-offset:5px}section[id],h3[id]{scroll-margin-top:112px}
.site-header{background:var(--panel);border-bottom:2px solid var(--line);backdrop-filter:none}.header-inner{height:88px;gap:24px}.brand{font-size:21px;color:var(--mint);gap:11px;font-weight:750}.brand img{width:44px;height:44px;border-radius:50%}.brand small{font-size:11px;letter-spacing:0;color:var(--muted);font-weight:400}.header-inner nav{gap:6px;font-size:14px}.header-inner nav a{padding:9px 15px;min-height:46px;border:2px solid transparent;border-radius:12px;display:flex;align-items:center;font-weight:650}.header-inner nav a:hover{background:var(--panel)}.header-inner nav a[aria-current]{background:var(--panel2);border-color:var(--line);color:var(--mint)}.header-link{border:0;font-size:13px;padding-left:15px;color:var(--muted)}.eyebrow{color:var(--mint);font-size:13px;letter-spacing:0;margin-bottom:10px}
.button{gap:10px;min-height:48px;padding:10px 24px;border:2px solid var(--line);border-radius:14px;background:var(--panel);color:var(--mint);font-size:15px;font-weight:700;box-shadow:0 4px 0 var(--line);transition:transform .14s ease,box-shadow .14s ease,background .14s ease;line-height:1.5;white-space:normal;text-align:center}.button:hover{filter:none;background:var(--panel);color:var(--mint)}.button:active{transform:translateY(3px);box-shadow:0 1px 0 var(--line)}.button-blue{background:#58cc02!important;color:#244b0b!important;border-color:#58cc02!important;box-shadow:0 4px 0 #419700}.button-blue:hover{background:#65d511!important;border-color:#65d511!important;filter:none}.button-blue:active{box-shadow:0 1px 0 #419700}.button-white{background:var(--panel)}.button:disabled{opacity:.55;box-shadow:none;transform:none}.text-link{font-size:14px;font-weight:700;color:var(--mint);min-height:44px;display:inline-flex;align-items:center}.text-link:hover{text-decoration:underline;color:var(--mint)}
.home-intro{display:grid;grid-template-columns:1fr 1fr;gap:66px;align-items:center;min-height:620px;padding:64px 24px 70px}.hero-copy{text-align:center;animation:welcome-in .6s ease-out both}.home-intro h1{font-size:40px;line-height:1.55;letter-spacing:0;margin:0 0 20px;color:var(--text)}.hero-description{color:var(--muted);line-height:1.9;font-size:16px;margin-bottom:28px}.hero-actions{display:flex;flex-direction:column;gap:16px;max-width:330px;margin:auto}.hero-actions .button{min-height:51px;width:100%}.hero-free{margin-top:22px;color:var(--muted);font-size:12px}.hero-friends{height:400px;position:relative;isolation:isolate;animation:friends-in .75s ease-out both;min-width:0}.hero-friends img{position:absolute;height:auto}.friend-main{width:355px;left:2%;top:100px;z-index:2}.friend-yellow{width:115px;right:2px;top:10px;z-index:3;rotate:12deg}.friend-pink{width:97px;left:8px;bottom:8px;z-index:3;rotate:-8deg}.friend-orbit{position:absolute;border-radius:50%;z-index:-1}.orbit-one{width:290px;height:290px;left:52px;top:65px;background:var(--panel2)}.orbit-two{width:96px;height:96px;right:14px;bottom:38px;background:var(--panel2)}.hero-block{position:absolute;z-index:4;padding:9px 16px;border-radius:14px;color:#493400;font-size:13px;font-weight:650;line-height:1.5;box-shadow:0 4px 0 #e4a828}.block-event{top:25px;left:15px;background:#ffd252;rotate:-8deg}.block-event:before{content:"";position:absolute;left:17px;top:-5px;width:23px;height:11px;background:#ffd252;border-radius:20px 20px 0 0}.block-action{bottom:35px;right:4px;background:var(--panel2);box-shadow:0 4px 0 #b0d9f3;color:var(--mint);rotate:5deg}.block-action b{font-size:12px;background:var(--panel);border-radius:15px;padding:5px 10px;margin-left:5px}.friend-spark{position:absolute;color:#f5bb1b;z-index:3}.friend-spark svg{fill:#ffe486;stroke-width:1.8;width:28px;height:28px}.spark-one{left:8px;top:143px;rotate:-12deg}.spark-two{right:5px;top:190px;rotate:15deg}.spark-two svg{width:19px;height:19px}@keyframes welcome-in{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:none}}@keyframes friends-in{from{opacity:0;transform:translateY(15px) scale(.96)}to{opacity:1;transform:none}}
.learning-strip{border-block:2px solid var(--line);display:grid;grid-template-columns:repeat(3,1fr);padding:22px 8px;gap:25px}.learning-strip>a{display:flex;justify-content:center;align-items:center;gap:16px;min-height:64px;font-size:17px;font-weight:700;border-radius:14px}.learning-strip>a:hover{background:var(--panel)}.learning-strip small{display:block;font-size:12px;color:var(--muted);font-weight:400;margin-top:1px}.strip-icon{display:grid;place-items:center;width:48px;height:48px;border-radius:14px;background:var(--panel2);color:var(--mint)}.strip-icon svg{width:27px;height:27px}.strip-icon.blue{background:var(--panel2);color:var(--mint)}.strip-icon.purple{background:var(--panel2);color:#d2b5ef}
.learning-section,.topic-section{margin-top:78px}.section-title{margin:0 0 36px;align-items:center}.section-title h2{font-size:30px}.section-title p{font-size:15px;color:var(--muted);margin-top:8px}.learning-layout{display:grid;grid-template-columns:1.15fr 1fr;gap:95px;align-items:center}.foundation-list{display:grid;gap:16px;position:relative;max-width:530px}.foundation-list>a{position:relative;display:flex;gap:20px;align-items:center;min-height:84px;padding:7px 14px 10px 0;isolation:isolate}.foundation-list>a:before{content:"";position:absolute;width:0;border-left:4px dashed var(--line);left:33px;top:64px;bottom:-29px;z-index:-1}.foundation-list>a:last-child:before{display:none}.foundation-list>a:nth-child(3n+2){margin-left:25px}.foundation-list>a:nth-child(3n){margin-left:50px}.path-number{display:grid;place-items:center;flex:none;width:68px;height:64px;border-radius:50%;background:#70d12f;border:6px solid var(--line);box-shadow:0 5px 0 #4f9e1c;color:#214907;font-weight:800;font-size:24px;transition:transform .14s,box-shadow .14s}.foundation-list>a:hover .path-number{background:#83dc49}.foundation-list>a:active .path-number{transform:translateY(4px);box-shadow:0 1px 0 #4f9e1c}.foundation-list h3{font-size:18px;line-height:1.6}.foundation-list p{color:var(--muted);font-size:13px;margin-top:4px}.path-chevron{margin-left:auto;color:#b4b4b4;font-size:26px}.learning-note{text-align:center;padding:32px 20px;border:2px solid var(--line);border-radius:22px;position:relative;background:var(--panel);max-width:350px}.learning-note img{width:115px;height:auto;margin-bottom:20px}.learning-note h3{font-size:22px;margin-bottom:14px}.learning-note p{font-size:15px;line-height:1.95;color:var(--muted);margin-bottom:24px}.learning-note .button{width:230px;max-width:100%;color:var(--mint)}.note-tip{display:flex;justify-content:center;align-items:center;gap:6px;font-size:11px;color:var(--muted);margin-top:24px}.note-tip svg{width:16px;height:16px;color:var(--mint)}
.play-section{display:grid;grid-template-columns:1fr 1fr;align-items:center;gap:100px;padding:64px 30px;margin-top:78px;border-block:2px solid var(--line)}.play-copy h2{font-size:32px;margin:18px 0}.play-copy p{color:var(--muted);line-height:1.95;margin-bottom:25px}.play-icon{display:grid;place-items:center;background:var(--panel2);color:var(--mint);width:52px;height:52px;border-radius:16px}.play-note{display:block;font-size:12px;color:var(--muted);margin-top:20px}.hero-stage{min-width:0;max-width:380px;width:100%;margin:auto}.demo-sheet{border:2px solid var(--line);box-shadow:0 6px 0 #e5e5e5;border-radius:23px;background:var(--panel);padding:23px;text-align:center;overflow:hidden}.sheet-heading{display:flex;justify-content:space-between;align-items:center;font-size:11px;font-weight:600;color:var(--muted);margin-bottom:14px}.sheet-heading>span:last-child{background:var(--panel2);color:var(--mint);border-radius:7px;padding:3px 9px}.demo-sheet h3{font-size:21px;margin-bottom:16px}.demo-board{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;width:225px;max-width:100%;padding:14px;background:var(--panel2);border-radius:18px;margin:18px auto}.demo-tile{display:grid;place-items:center;position:relative;aspect-ratio:1;border-radius:15px;box-shadow:0 4px 0 var(--tile-shadow);background:var(--tile-color)}.tile-gold{--tile-color:#ffd144;--tile-shadow:#e5b326}.tile-blue{--tile-color:#57bfea;--tile-shadow:#2699cb}.tile-coral{--tile-color:#fc8f9d;--tile-shadow:#e46b83}.demo-tile i{width:45%;height:45%;display:block;background:#fff9;border-radius:50%}.tile-blue i{border-radius:6px}.tile-coral i{border-radius:7px;rotate:45deg}.demo-tile.is-cleared{opacity:0}.stage-console p{min-height:40px;display:flex;align-items:center;justify-content:center;font-size:12px;color:var(--muted);line-height:1.6;margin:10px 0}.stage-console button{width:100%;font-size:14px}.demo-footnote{display:block;font-size:10px;color:var(--muted);margin-top:21px}
.topic-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px}.topic-card{padding:26px;border:2px solid var(--line);border-radius:19px;box-shadow:0 4px 0 var(--line);background:var(--panel);transition:transform .15s,box-shadow .15s}.topic-card:hover{background:var(--panel);color:var(--text);border-color:var(--line);box-shadow:0 4px 0 #c9dcc0}.topic-card:active{transform:translateY(3px);box-shadow:0 1px 0 var(--line)}.topic-icon{display:grid;place-items:center;width:52px;height:52px;border-radius:16px;background:var(--panel2);color:var(--mint);margin-bottom:20px}.topic-icon svg{width:30px;height:30px}.topic-blue .topic-icon{background:var(--panel2);color:var(--mint)}.topic-purple .topic-icon{background:var(--panel2);color:#d2b5ef}.topic-card h3{font-size:20px;margin-bottom:11px}.topic-card p{font-size:14px;color:var(--muted);line-height:1.9}.topic-count{display:flex;justify-content:space-between;align-items:center;margin-top:24px;font-size:13px;font-weight:700;color:var(--mint)}.topic-count b{font-size:26px;line-height:1}
.search-dock{display:grid;grid-template-columns:1fr 1fr;gap:35px;align-items:center;margin-top:75px;padding:30px;border:2px solid var(--line);border-radius:20px;background:var(--panel)}.search-dock>div{display:flex;align-items:center;gap:17px}.search-symbol{display:grid;place-items:center;flex:none;color:var(--mint)}.search-symbol svg{width:34px;height:34px}.search-dock h2{font-size:20px}.search-dock p{font-size:12px;color:var(--muted);margin-top:4px}.home-search{border:2px solid var(--line);background:var(--panel);border-radius:14px;display:flex;gap:5px;padding:5px}.home-search input{font-size:15px;border:0;background:var(--panel);min-width:0;padding:7px 9px}.home-search button{padding:10px;background:#58cc02!important;color:#244b0b!important;min-width:44px;min-height:44px;border:0;border-radius:10px;display:grid;place-items:center}.home-search button:hover{background:#6edb1c!important}
.page-heading{padding:45px 0 35px}.page-heading h1{font-size:34px;color:var(--text)}.page-heading>p:last-child{font-size:15px;margin-top:13px;max-width:740px;color:var(--muted)}.page-heading .eyebrow{font-size:13px}.course-map-layout{display:grid;grid-template-columns:minmax(0,1fr) 290px;gap:65px;align-items:start}.course-grid{gap:20px}.course-card{background:var(--panel);border:2px solid var(--line);box-shadow:0 4px 0 var(--line);border-radius:18px;padding:23px;gap:18px;transition:background .15s,border-color .15s,transform .15s}.course-card:hover{background:var(--panel);color:var(--text);border-color:var(--line)}.course-card:active{transform:translateY(3px);box-shadow:0 1px 0 var(--line)}.course-visual{width:46px;flex-shrink:0}.course-visual img{display:none}.course-number{font-size:16px;font-weight:750;letter-spacing:0;background:var(--panel2);color:var(--mint);border-radius:11px;width:42px;height:42px;display:grid;place-items:center;margin:0}.course-category{font-size:12px;color:var(--muted)}.course-info{flex:1}.course-info h2{font-size:19px;line-height:1.6;margin:4px 0 9px}.course-info p{font-size:14px;line-height:1.85;color:var(--muted)}.card-bottom{border:0;padding:0;margin:18px 0 0;display:flex;align-items:center;justify-content:space-between;gap:12px;font-size:11px;color:var(--muted)}.round-arrow{display:grid;place-items:center;width:28px;height:28px;color:var(--mint);font-size:26px;line-height:1}
[data-page="courses"] .page-heading{border-bottom:2px solid var(--line);margin-bottom:25px}[data-page="courses"] .course-grid{grid-template-columns:1fr;gap:0}[data-page="courses"] .course-card{position:relative;border:0;box-shadow:none;border-radius:15px;padding:25px 10px;gap:23px;background:var(--panel);isolation:isolate;min-height:170px}[data-page="courses"] .course-card:after{content:"";position:absolute;left:47px;top:92px;bottom:-20px;border-left:4px dashed var(--line);z-index:-1}[data-page="courses"] .course-card:last-child:after{display:none}[data-page="courses"] .course-card:nth-child(3n+2){margin-left:28px}[data-page="courses"] .course-card:nth-child(3n){margin-left:56px}[data-page="courses"] .course-visual{width:76px;padding-top:4px}[data-page="courses"] .course-number{width:76px;height:70px;border:7px solid var(--line);background:#70d12f;box-shadow:0 5px 0 #4f9e1c;border-radius:50%;font-size:25px;color:#214907}[data-page="courses"] .course-info h2{font-size:20px}[data-page="courses"] .course-card:hover .course-info h2{color:var(--mint)}[data-page="courses"] .card-bottom{margin-top:12px}[data-page="courses"] .course-card:active{transform:none}[data-page="courses"] .course-card:active .course-number{translate:0 3px;box-shadow:0 2px 0 #4f9e1c}.journey-guide{position:sticky;top:125px;margin-top:35px;text-align:center;border:2px solid var(--line);border-radius:20px;padding:28px 20px}.journey-guide img{width:100px;height:auto;margin:0 auto 18px}.journey-guide h2{font-size:23px;margin-bottom:12px}.journey-guide p{font-size:14px;line-height:1.9;color:var(--muted);margin-bottom:23px}.next-stop{border-top:2px solid var(--line);padding:30px 0;margin-top:30px;gap:20px;font-size:15px}
.series-nav{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:28px}.series-nav a{border:2px solid var(--line);border-radius:13px;padding:9px 17px;font-size:14px;font-weight:650;min-height:46px;box-shadow:0 3px 0 var(--line);background:var(--panel)}.series-nav a:hover{background:var(--panel)}.series-nav a[aria-current]{border-color:#a6db80;background:var(--panel2);color:var(--mint);box-shadow:0 3px 0 #a6db80}.series-nav small{color:inherit;margin-left:12px;font-size:12px}.practice-group{margin-bottom:40px;scroll-margin-top:110px}.practice-banner{position:relative;display:flex;justify-content:space-between;align-items:center;min-height:165px;padding:25px 32px;border-radius:20px;background:var(--panel2);gap:25px;margin-bottom:22px;border:2px solid var(--line)}.practice-banner h2{font-size:25px;line-height:1.6;color:var(--mint)}.practice-banner .eyebrow{font-size:12px;color:var(--mint);margin-bottom:6px}.practice-banner p:last-child{font-size:13px;color:var(--mint);margin-top:8px}.practice-banner img{width:95px;height:110px;flex-shrink:0}#match3 .practice-banner{background:var(--panel2);border-color:var(--line)}#match3 .practice-banner h2,#match3 .practice-banner p{color:var(--mint)}#gameplay .practice-banner{background:#302637;border-color:var(--line)}#gameplay .practice-banner h2,#gameplay .practice-banner p{color:#f1d6a4}#basics .practice-banner{background:var(--panel2);border-color:var(--line)}#basics .practice-banner h2,#basics .practice-banner p{color:#d2b5ef}
.breadcrumbs{font-size:12px;padding:22px 0}.reading-layout{grid-template-columns:210px minmax(0,1fr);gap:34px;align-items:start}.lesson-sidebar{top:112px;max-height:calc(100vh - 140px);padding-right:7px;scrollbar-width:thin}.lesson-sidebar summary{display:flex;justify-content:space-between;align-items:center;gap:8px;min-height:46px;font-size:14px;font-weight:700;padding:10px 6px}.lesson-sidebar summary small{font-size:10px;color:var(--muted);font-weight:400}.lesson-outline{margin-bottom:18px}.lesson-outline>summary{border-bottom:2px solid var(--line);margin-bottom:10px}.course-outline{border-top:2px solid var(--line);padding-top:6px}.toc-group{font-size:12px;margin:20px 9px 7px}.lesson-sidebar nav a{font-size:12px;line-height:1.7;padding:9px 10px;min-height:42px;border:2px solid transparent;border-radius:11px;margin:4px 0;gap:8px;color:var(--muted)}.lesson-sidebar nav a>span{font-size:12px;color:var(--mint);flex:none}.lesson-sidebar nav a:hover{background:var(--panel);color:var(--mint)}.lesson-sidebar nav a[aria-current]{border-color:var(--line);background:var(--panel2);color:var(--mint);font-weight:650}.sidebar-manual{font-size:12px;padding:16px 4px;color:var(--mint)}.lesson-article{max-width:none;min-width:0;border:2px solid var(--line);background:var(--panel);border-radius:20px;padding:30px 32px 0}.article-header{padding:0 0 23px;margin-bottom:20px;border-bottom:2px solid var(--line)}.article-header h1{font-size:29px;line-height:1.6}.article-header .eyebrow{margin:10px 0 7px;font-size:12px;color:var(--muted)}.tag,.pill{border:0;border-radius:7px;background:var(--panel2);color:var(--mint);font-size:12px;padding:4px 10px}.article-content{font-size:16px;line-height:1.95}.lesson-callout,.callout{background:var(--panel2);border-color:#83cbee;color:var(--mint);border-radius:0 12px 12px 0;font-size:15px}.guide-overview{display:flex;align-items:center;flex-wrap:wrap;gap:12px 18px;font-size:12px;color:var(--muted);margin:22px 0}.guide-overview strong{font-size:20px;color:var(--text);margin-right:4px}.guide-overview .button{margin-left:auto;min-height:44px;padding:8px 16px;font-size:13px}.lesson-preparation{border:2px solid var(--line);border-radius:15px;margin:25px 0 10px;overflow:hidden}.lesson-preparation>summary{display:flex;align-items:center;justify-content:space-between;padding:15px 18px;font-size:15px;font-weight:650;color:var(--text);list-style:none;gap:15px;background:var(--panel)}.lesson-preparation>summary::-webkit-details-marker{display:none}.lesson-preparation>summary small{display:block;font-size:11px;color:var(--muted);font-weight:400;margin-top:4px}.disclosure-mark{font-size:25px;color:var(--mint);transition:rotate .2s}.lesson-preparation[open] .disclosure-mark{rotate:45deg}.preparation-body{padding:12px 19px 22px;border-top:2px solid var(--line)}.preparation-body h3{font-size:19px}.recipe-notation,.concept-review,.long-parameter,.original-text{padding:15px 18px;background:var(--panel);border-radius:12px;font-size:14px}.series-switcher{font-size:12px;color:var(--muted);padding:8px 0;margin-bottom:8px}.series-switcher summary{min-height:44px;display:flex;align-items:center}.recipe-series{gap:7px;font-size:12px;margin:12px 0}.recipe-series>a{display:inline-flex;align-items:center;min-height:44px;padding:5px 11px;border:2px solid var(--line);border-radius:10px}.recipe-series a[aria-current]{color:var(--mint)!important;background:var(--panel2)!important;border-color:#a6db80}.recipe-step{padding:30px 0;border-top:2px solid var(--line)}.recipe-number{font-size:12px;font-weight:700;color:var(--mint)}.recipe-step h3{font-size:23px;line-height:1.6;margin:6px 0 18px}.recipe-step>ol{padding-left:1.6em}.recipe-step>ol>li{padding-left:3px;margin-top:13px}.recipe-step>ol>li::marker{font-weight:750;color:var(--mint)}.recipe-check{background:var(--panel2);color:var(--mint);border-color:#8bce60;font-size:14px;border-radius:0 12px 12px 0;padding:15px 18px}.lesson-source,.content-note{font-size:12px;line-height:1.85;color:var(--muted)}.lesson-navigation{gap:10px;border-top:2px solid var(--line);padding:24px 0;margin-top:20px;font-size:12px;color:var(--muted)}.lesson-navigation .button{font-size:13px;padding:9px 18px}.table-wrap{max-width:100%;overflow:auto;border:1px solid var(--line);border-radius:12px}table{font-size:14px;line-height:1.8}th{background:var(--panel2);color:var(--mint)}th,td{padding:13px 15px}.block-reference{font-size:13px;border:1px solid var(--line);border-radius:10px;background:var(--panel2);color:var(--mint);padding:7px 11px}.block-reference small{font-size:11px}.lesson-code-wrap{border-radius:12px;border-color:var(--line);background:var(--panel)}.lesson-code-wrap:before{font-size:12px;background:var(--panel2);color:#b5c4d4;border-color:var(--line)}.copy-code{min-height:44px;border-radius:9px;border:2px solid var(--line);background:var(--panel);color:var(--mint);padding:7px 12px;font-size:12px}pre{font-size:13px;color:#ced4e8}
.library-layout{grid-template-columns:238px minmax(0,1fr);gap:32px}.filter-panel{top:112px;border:2px solid var(--line);border-radius:18px;background:var(--panel);padding:21px}.filter-panel label{font-size:13px;color:var(--text);margin-bottom:19px;font-weight:600}input,select{border:2px solid var(--line);background:var(--panel);border-radius:11px;padding:10px 12px}.filter-panel input,.filter-panel select{font-size:14px;background:var(--panel);border-color:var(--line)}.filter-panel button{margin-bottom:3px}.manual-status{font-size:14px;padding-bottom:17px;border-bottom:2px solid var(--line);margin:0 0 12px}.manual-status>span{font-size:12px;color:var(--muted)}.manual-result{border:2px solid var(--line);border-radius:14px;padding:20px 17px;margin-bottom:12px;grid-template-columns:100px minmax(0,1fr) 70px;gap:18px;background:var(--panel)}.manual-result:hover{background:var(--panel);border-color:var(--line);color:var(--text)}.manual-result-meta{font-size:12px;gap:8px}.manual-result strong{font-size:17px}.manual-excerpt{font-size:14px;color:var(--muted)}.manual-read{font-size:11px;color:var(--mint)}.block-kind{border-radius:7px;font-size:12px;padding:3px 9px;font-weight:600}.block-kind[data-kind="事件"]{background:#302637;color:#f1d6a4}.block-kind[data-kind="动作"]{background:var(--panel2);color:var(--mint)}.block-kind[data-kind="控制"]{background:var(--panel2);color:#d2b5ef}.block-kind[data-kind="条件"]{background:#302637;color:#f1d6a4}.block-kind[data-kind="取值"]{background:var(--panel2);color:var(--mint)}.manual-pagination{border-top:2px solid var(--line);font-size:13px}.block-layout{grid-template-columns:minmax(0,1fr) 200px;gap:30px}.block-article{padding:30px;border:2px solid var(--line);border-radius:20px;background:var(--panel)}.block-article h1{font-size:30px;line-height:1.6}.block-lead{font-size:16px}.block-section{border-top:2px solid var(--line)}.block-section h2{font-size:24px}.block-section h3{font-size:19px}.block-outline{padding:16px 18px;border:2px solid var(--line);border-radius:17px;background:var(--panel);font-size:12px;top:112px}.block-outline a{min-height:42px}.warning{background:#302637;color:#f1d6a4;border-color:#e5bf4b}
.block-figure{border-color:var(--line);border-radius:14px}.diagram-toolbar{background:var(--panel2);color:#c7c4d7;border-color:var(--line);font-size:12px;padding:10px 13px}.diagram-toolbar button{background:var(--panel);color:var(--mint);border:1px solid var(--line);min-height:42px;border-radius:8px;font-size:12px}.diagram-toolbar button:hover{background:var(--panel2)}.diagram-save{color:var(--mint);min-height:42px;display:inline-flex;align-items:center}.diagram-legend{font-size:12px;gap:12px 15px;margin:9px 0 15px}.diagram-text{padding:10px 0;border:0;border-bottom:2px solid var(--line);border-radius:0;font-size:13px}.diagram-text>summary{min-height:44px;display:flex;align-items:center}.block-figure figcaption{font-size:12px}.diagram-dialog-header button{min-height:44px}.empty-state{background:var(--panel)}.site-footer{margin-top:70px;padding-block:30px 40px;border-top:2px solid var(--line);font-size:12px}.site-footer strong{color:var(--mint);font-size:16px}.site-footer>span{color:var(--muted)}.image-credits summary{min-height:44px}.toast{max-width:90vw;background:#2d6816;color:white;border-radius:12px}.skip-link:hover{color:white}
@media(max-width:1050px){.header-inner{gap:17px}.header-link{display:none}.home-intro{gap:35px;padding-inline:0;min-height:575px}.home-intro h1{font-size:35px}.friend-main{width:310px}.hero-friends{height:370px}.orbit-one{width:260px;height:260px;left:35px}.friend-yellow{width:100px;right:0}.friend-pink{width:85px}.block-action{font-size:11px}.block-action b{font-size:11px}.learning-layout{gap:45px}.play-section{gap:55px;padding-inline:10px}.course-map-layout{gap:35px;grid-template-columns:minmax(0,1fr) 245px}.reading-layout{grid-template-columns:185px minmax(0,1fr);gap:25px}.lesson-article{padding:25px 25px 0}.topic-card{padding:23px}.topic-card h3{font-size:18px}.block-layout{grid-template-columns:minmax(0,1fr) 180px;gap:22px}.library-layout{grid-template-columns:220px minmax(0,1fr);gap:24px}}
@media(max-width:850px){.shell{padding-inline:24px}.brand{font-size:18px}.brand small{font-size:10px}.header-inner nav{gap:2px}.header-inner nav a{padding:8px 10px;font-size:12px}.home-intro{gap:18px;min-height:545px}.home-intro h1{font-size:31px}.hero-description{font-size:14px}.hero-friends{height:340px}.friend-main{width:265px;top:100px}.friend-yellow{width:83px;top:22px}.friend-pink{width:74px;bottom:12px}.orbit-one{width:230px;height:230px;left:26px;top:73px}.block-event{font-size:11px;top:39px;left:8px}.block-action{padding:8px 10px;bottom:28px;right:0}.block-action b{padding:4px 7px}.learning-layout{gap:30px;grid-template-columns:1.1fr 1fr}.learning-note{padding:25px 14px}.learning-note h3{font-size:20px}.foundation-list h3{font-size:16px}.foundation-list>a:nth-child(3n+2){margin-left:15px}.foundation-list>a:nth-child(3n){margin-left:30px}.foundation-list>a{gap:16px}.path-number{width:58px;height:54px;font-size:21px}.foundation-list>a:before{left:28px}.play-section{gap:35px}.play-copy h2{font-size:28px}.play-copy p{font-size:14px}.topic-grid{gap:16px}.topic-card{padding:20px}.topic-card h3{font-size:17px}.topic-card p{font-size:13px}.search-dock{padding:24px;gap:25px}.search-dock h2{font-size:18px}.search-symbol{display:none}.course-map-layout{grid-template-columns:minmax(0,1fr) 215px;gap:25px}.journey-guide{padding-inline:15px}.journey-guide h2{font-size:20px}.course-info h2{font-size:18px}.course-card{padding:20px;gap:14px}.practice-banner{padding:23px}.practice-banner h2{font-size:23px}}
@media(max-width:768px){.reading-layout{grid-template-columns:1fr;gap:16px}.lesson-sidebar{position:static;max-height:none;display:grid;grid-template-columns:1fr 1fr;gap:12px;padding:0;align-items:start}.lesson-sidebar details{border:2px solid var(--line);border-radius:13px;padding:0;margin:0;background:var(--panel);overflow:hidden}.lesson-sidebar summary{font-size:12px;min-height:44px;padding:9px 12px;margin:0;border:0}.lesson-sidebar summary small{font-size:10px}.lesson-sidebar nav{max-height:280px;overflow:auto;padding:0 6px 6px}.lesson-sidebar details[open]{grid-column:1/-1}.sidebar-manual{display:none}.block-layout{display:flex;flex-direction:column;gap:17px}.block-outline{position:static;order:-1;padding:8px 12px}.block-outline nav{display:flex;flex-wrap:wrap;gap:16px;margin:0}.block-outline .related-blocks,.block-outline>strong,.block-outline hr{display:none}.block-article{padding:25px}.library-layout{grid-template-columns:1fr;gap:24px}.filter-panel{position:static;padding:18px}.filter-panel form{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:15px}.filter-panel label{margin:0}.filter-panel label:first-child{grid-column:1/-1}.filter-panel .content-note{display:none}.filter-panel button{align-self:end}.course-map-layout{grid-template-columns:1fr}.journey-guide{position:static;margin-top:20px;display:none}.learning-layout{gap:26px}.header-inner{height:82px}.header-inner nav a{padding-inline:9px}.brand img{width:38px;height:38px}.hero-free{font-size:11px}.play-copy h2{font-size:26px}}
@media(max-width:720px){.header-inner{height:auto}}
@media(max-width:640px){html{scroll-padding-top:131px}.shell{padding-inline:20px}.header-inner{height:auto;display:flex;flex-wrap:wrap;gap:10px;padding-top:13px;padding-bottom:10px}.brand{font-size:19px;gap:10px}.brand img{width:36px;height:36px}.brand small{display:none}.header-inner nav{width:100%;margin:0;justify-content:space-between;gap:4px}.header-inner nav a{font-size:12px;min-height:41px;padding:7px 12px;border-radius:10px}.home-intro{display:flex;flex-direction:column;gap:12px;min-height:0;padding:24px 0 34px}.hero-friends{width:310px;max-width:100%;height:267px;flex-shrink:0}.friend-main{width:275px;top:54px;left:0}.friend-yellow{width:77px;right:0;top:0}.friend-pink{width:67px;left:7px;bottom:0}.orbit-one{width:215px;height:215px;left:38px;top:24px}.orbit-two{width:67px;height:67px;bottom:22px;right:8px}.block-event{font-size:10px;left:12px;top:10px;padding:7px 12px}.block-action{bottom:15px;right:0;padding:7px 10px;font-size:10px}.block-action 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.text-link{font-size:12px;min-height:30px}.learning-layout{display:block}.learning-note{display:none}.foundation-list{max-width:440px;margin:0 auto;gap:12px}.foundation-list>a{gap:18px;min-height:85px}.foundation-list h3{font-size:17px}.foundation-list p{font-size:12px}.foundation-list>a:nth-child(3n+2){margin-left:22px}.foundation-list>a:nth-child(3n){margin-left:44px}.foundation-list>a:before{bottom:-27px}.path-chevron{font-size:24px}.play-section{grid-template-columns:1fr;gap:32px;margin-top:42px;padding:35px 0 40px}.play-copy{text-align:center}.play-icon{margin:auto;width:44px;height:44px;border-radius:14px}.play-copy h2{font-size:26px;line-height:1.5;margin:17px 0}.play-copy p{font-size:14px;margin-bottom:22px}.play-copy .button{width:280px;max-width:100%;font-size:14px}.play-note{font-size:11px;margin-top:18px}.hero-stage{max-width:340px}.demo-sheet{padding:21px 22px;border-radius:20px}.demo-sheet h3{font-size:20px}.demo-board{width:210px;gap:9px;padding:13px}.stage-console p{font-size:11px}.demo-footnote{font-size:10px}.topic-grid{grid-template-columns:1fr;gap:19px}.topic-card{display:grid;grid-template-columns:52px 1fr;column-gap:18px;padding:22px}.topic-icon{grid-row:1/4;margin:0}.topic-card h3{font-size:19px}.topic-card p{font-size:13px}.topic-count{margin-top:15px;font-size:12px}.search-dock{grid-template-columns:1fr;margin-top:43px;padding:22px;gap:17px}.search-dock h2{font-size:19px}.search-dock p{font-size:12px}.home-search input{font-size:16px;padding-left:5px}.home-search{padding:4px}.home-search button{padding:8px}.page-heading{padding:29px 0 26px}.page-heading h1{font-size:28px;line-height:1.5}.page-heading>p:last-child{font-size:14px;margin-top:12px}.page-heading .eyebrow{font-size:12px}.series-nav{gap:9px;margin-bottom:25px}.series-nav a{font-size:12px;padding:8px 11px;min-height:44px}.series-nav small{font-size:11px;margin-left:7px}.practice-group{margin-bottom:30px}.practice-banner{padding:22px 20px;gap:10px;min-height:0;margin-bottom:20px;border-radius:17px}.practice-banner h2{font-size:21px}.practice-banner .eyebrow{font-size:11px}.practice-banner p:last-child{font-size:12px;line-height:1.8;margin-top:9px}.practice-banner img{width:62px;height:76px}.course-grid{grid-template-columns:1fr;gap:16px}.course-card{padding:20px 17px;gap:13px;border-radius:16px}.course-number{width:37px;height:37px;font-size:14px}.course-visual{width:37px}.course-category{font-size:11px}.course-info h2{font-size:18px;margin:5px 0 9px}.course-info p{font-size:13px}.card-bottom{font-size:11px;margin-top:16px;gap:8px}[data-page="courses"] .page-heading{margin-bottom:13px}[data-page="courses"] .course-card{gap:18px;padding:22px 0;min-height:181px}[data-page="courses"] .course-card:nth-child(3n+2){margin-left:16px}[data-page="courses"] .course-card:nth-child(3n){margin-left:32px}[data-page="courses"] .course-visual{width:61px;padding-top:6px}[data-page="courses"] .course-number{width:61px;height:58px;font-size:21px;border-width:6px}[data-page="courses"] .course-card:after{left:29px;top:85px;bottom:-29px}[data-page="courses"] .course-info h2{font-size:19px}[data-page="courses"] .course-info p{font-size:13px}[data-page="courses"] .card-bottom{font-size:10px}.next-stop{flex-wrap:wrap;gap:17px;margin-top:20px;padding:25px 0;font-size:14px}.next-stop .button{font-size:14px;min-height:45px}.breadcrumbs{font-size:11px;gap:8px;padding:18px 0}.lesson-sidebar summary{font-size:12px;padding-inline:10px}.lesson-sidebar summary small{font-size:10px}.lesson-sidebar nav a{font-size:12px;min-height:44px}.lesson-article{padding:23px 18px 0;border-radius:17px}.article-header{padding-bottom:19px;margin-bottom:16px}.article-header h1{font-size:25px;line-height:1.6}.article-header .eyebrow{font-size:11px;margin-top:10px}.tag,.pill{font-size:11px}.article-content{font-size:15px;line-height:1.95}.lesson-callout{font-size:14px;padding:12px 14px}.guide-overview{gap:10px;font-size:11px;margin:20px 0}.guide-overview>span:nth-child(2){display:none}.guide-overview strong{font-size:18px}.guide-overview .button{font-size:12px;min-height:42px;padding:7px 13px}.lesson-preparation{margin-top:20px}.lesson-preparation>summary{font-size:13px;padding:12px}.lesson-preparation>summary small{display:none}.disclosure-mark{font-size:23px}.preparation-body{padding:10px 12px 17px}.preparation-body h3{font-size:18px}.recipe-notation,.concept-review,.original-text{font-size:13px;padding:13px}.recipe-step{padding:25px 0}.recipe-step h3{font-size:21px;margin-bottom:15px}.recipe-step>ol{padding-left:1.5em}.recipe-step>ol>li{padding-left:0;margin-top:12px}.recipe-check{font-size:13px;padding:12px 14px}.lesson-source{font-size:12px}.lesson-navigation{padding:20px 0;gap:8px}.lesson-navigation .button{font-size:12px;padding:8px 12px;min-height:44px}.lesson-navigation>span{font-size:11px;flex:none}.diagram-legend{font-size:11px;gap:9px 12px}.diagram-toolbar{display:block;font-size:11px;padding:10px}.diagram-toolbar>div{margin-top:8px}.diagram-toolbar button{font-size:11px;min-height:44px;padding:6px 9px}.diagram-viewport{max-height:680px}.diagram-dialog{width:98vw}.block-figure{margin:20px 0;border-radius:11px}.block-figure figcaption{font-size:11px;padding:10px 12px}.diagram-text{font-size:12px}.block-photo-grid{grid-template-columns:1fr}.table-wrap{margin-bottom:20px}table{font-size:13px}th,td{padding:11px 12px}pre{font-size:12px;padding:16px}.filter-panel{padding:16px}.filter-panel form{gap:14px}.filter-panel label{font-size:12px}.filter-panel input,.filter-panel select{font-size:16px}.filter-panel button{min-height:44px;font-size:13px;padding:8px}.manual-status{font-size:13px;padding-bottom:15px}.manual-status>span{display:none}.manual-result{grid-template-columns:1fr;gap:9px;padding:17px;margin-bottom:12px}.manual-result-meta{flex-direction:row;align-items:center;gap:9px;font-size:11px}.manual-result strong{font-size:17px}.manual-excerpt{font-size:13px}.manual-read{display:none}.manual-pagination{font-size:12px;gap:10px}.manual-pagination .button{font-size:12px;padding:8px 12px}.block-article{padding:22px 18px;border-radius:17px}.block-article h1{font-size:26px}.block-lead{font-size:15px}.block-section h2{font-size:22px}.block-section h3{font-size:18px}.block-outline nav{font-size:11px;gap:11px}.callout{font-size:14px}.site-footer{display:block;margin-top:45px;padding-block:25px 30px;font-size:11px}.site-footer strong{font-size:15px}.site-footer>span{display:none}.image-credits{margin-top:18px}.image-credits summary{min-height:44px}}
@media(max-width:360px){.shell{padding-inline:16px}.header-inner nav a{padding-inline:9px;font-size:11px}.home-intro h1{font-size:28px}.hero-friends{height:250px;width:285px}.friend-main{width:250px;top:55px}.friend-yellow{width:68px}.friend-pink{width:60px}.orbit-one{width:200px;height:200px;left:34px}.block-action{font-size:9px}.block-action b{font-size:9px}.learning-strip>a{font-size:11px}.learning-strip small{font-size:9px}.foundation-list h3{font-size:16px}.foundation-list>a:nth-child(3n){margin-left:30px}.foundation-list>a:nth-child(3n+2){margin-left:15px}.foundation-list>a{gap:15px}.foundation-list p{font-size:11px}.practice-banner{padding:18px 15px}.practice-banner h2{font-size:19px}.practice-banner img{width:47px;height:63px}.lesson-article,.block-article{padding-inline:14px}.article-header h1{font-size:23px}.lesson-sidebar summary small{display:none}.topic-card{column-gap:13px;padding:20px 17px}.topic-card h3{font-size:18px}.search-dock{padding:18px}.series-nav a{padding-inline:10px}[data-page="courses"] .course-card:nth-child(3n){margin-left:20px}[data-page="courses"] .course-card:nth-child(3n+2){margin-left:10px}[data-page="courses"] .course-card{gap:13px}[data-page="courses"] .course-info h2{font-size:17px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation:none!important;transition:none!important}.button:active,.topic-card:active,.course-card:active{transform:none}.path-number{transform:none!important}}

/* Curriculum expansion: reuse the existing playful cards, colors and mascots. */
.curriculum-tools{margin-bottom:30px}.curriculum-total{font-size:14px;color:var(--muted);margin-bottom:18px}.practice-filters{display:grid;grid-template-columns:minmax(220px,2fr) minmax(145px,1fr) minmax(195px,1.3fr) auto;align-items:end;gap:14px;margin:20px 0;padding:20px;border:2px solid var(--line);border-radius:16px;background:var(--panel)}.practice-filters label{display:grid;gap:7px;font-size:12px;font-weight:650}.practice-filters input,.practice-filters select{background:var(--panel);font-size:14px;min-height:46px}.practice-filters button{min-height:46px;white-space:nowrap;font-size:13px}.all-series{margin:15px 0}.all-series>summary{cursor:pointer;min-height:44px;display:list-item;list-style-position:inside;font-size:14px;color:var(--mint)}.all-series .series-nav{margin:12px 0 20px}.curriculum-tools #series-status{font-size:13px;color:var(--muted);padding-top:12px;border-top:2px solid var(--line)}.curriculum-section .topic-card{display:flex;flex-direction:column}.curriculum-section .topic-count{margin-top:auto;padding-top:16px}.curriculum-path-number{display:inline-flex;align-items:center;justify-content:center;width:44px;height:44px;background:#ffffffb8;border-radius:14px;color:var(--mint);font-weight:750;font-size:18px;margin-bottom:15px}.curriculum-section .eyebrow{margin-bottom:8px}.curriculum-section .topic-card h3{font-size:19px}.curriculum-section .topic-card p{margin-bottom:15px}.toc-search{padding:0 7px 12px}.toc-search input{font-size:12px;min-height:42px}.toc-search p{font-size:11px;line-height:1.6;margin-top:6px}.lesson-sidebar .toc-series{border:0;border-bottom:1px solid var(--line);border-radius:0;padding:0;margin:0;background:transparent}.lesson-sidebar .toc-series>summary{display:flex;justify-content:space-between;gap:8px;min-height:44px;padding:10px 7px;margin:0;font-size:12px;cursor:pointer}.lesson-sidebar .toc-series>summary::before{content:'›';font-size:17px}.lesson-sidebar .toc-series[open]>summary::before{transform:rotate(90deg)}.lesson-sidebar .toc-series>summary small{margin-left:auto;white-space:nowrap;font-size:10px}.lesson-sidebar #lesson-toc{max-height:55vh;overflow-y:auto;overscroll-behavior:contain}.lesson-sidebar .toc-series a{font-size:12px;overflow-wrap:anywhere}.practice-followup{border-top:2px solid var(--line);padding:28px 0}.practice-followup h2{font-size:23px;margin-bottom:14px}.series-switcher .recipe-series{flex-direction:column;align-items:stretch}.series-switcher .recipe-series>a{line-height:1.6;padding:9px 12px}.empty-state p{margin-top:10px}
@media(max-width:1000px){.practice-filters{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}.practice-filters label:first-child{grid-column:1/-1}.practice-filters button{grid-column:1/-1;justify-self:start}}
@media(max-width:640px){.practice-filters{padding:16px;gap:14px 10px}.practice-filters input,.practice-filters select{font-size:16px}.practice-filters label{font-size:11px}.practice-filters button{width:100%;justify-self:stretch}.curriculum-total{font-size:12px}.curriculum-section .topic-card{display:grid;grid-template-columns:44px minmax(0,1fr);column-gap:16px}.curriculum-path-number{grid-row:1/4;margin:0}.curriculum-section .topic-card h3{font-size:18px}.curriculum-section .topic-card p{margin-bottom:0}.curriculum-section .topic-count{padding-top:10px}.toc-search{padding:4px 10px 12px}.lesson-sidebar #lesson-toc{max-height:320px}.lesson-sidebar .toc-series[open]{display:block}.practice-followup h2{font-size:21px}}

/* Detailed tutorials: explicit preparation, placement and one action per numbered step. */
.detailed-start{padding:24px 0;border-bottom:2px solid var(--line);margin-bottom:28px}.detailed-start h2{font-size:26px;line-height:1.6}.detailed-start h3{font-size:21px;margin:24px 0 14px}.setup-object,.custom-catalog,.lesson-block-card{border:1px solid var(--line);border-radius:12px;margin:12px 0;padding:14px 16px;background:var(--panel)}.setup-object>summary,.custom-catalog>summary,.lesson-block-card>summary{cursor:pointer;font-weight:650;min-height:36px;line-height:1.7}.setup-object small,.lesson-block-card small{font-weight:400;color:var(--muted);display:block}.custom-catalog section{padding:16px 0;border-bottom:1px solid var(--line)}.trigger-placement{background:var(--panel2);border:2px solid var(--line);border-radius:14px;padding:18px;margin:22px 0}.trigger-placement article+article{border-top:1px solid var(--line);margin-top:18px;padding-top:16px}.trigger-placement h4{font-size:18px;margin:10px 0}.trigger-placement p{margin:9px 0;font-size:14px;overflow-wrap:anywhere}.block-location{background:var(--panel);border-left:4px solid #78b849;padding:18px;margin:16px 0;overflow-wrap:anywhere}.block-location .block-path{font-size:16px;line-height:1.9}.block-location .eyebrow{font-size:11px}.block-location ol{font-size:14px}.block-location a{text-decoration:underline}.lesson-block-cards{margin:18px 0}.microsteps>ol{counter-reset:micro;list-style:none;padding:0!important}.microsteps>ol>li{counter-increment:micro;border:1px solid var(--line);border-radius:12px;padding:16px 16px 16px 58px!important;position:relative;margin:12px 0!important;line-height:1.95;overflow-wrap:anywhere}.microsteps>ol>li:before{content:counter(micro);position:absolute;left:15px;top:18px;width:28px;height:28px;border-radius:50%;background:var(--panel2);color:var(--mint);text-align:center;line-height:28px;font-size:13px;font-weight:700}.logic-summary{margin:18px 0;color:var(--muted);font-size:14px}.logic-summary>summary{cursor:pointer}.scenario-tests{display:grid;gap:16px;margin:20px 0}.test-case{padding:18px;border:1px solid var(--line);border-radius:12px;background:var(--panel)}.test-case h4{font-size:18px;margin:0 0 12px}.test-case p{margin:9px 0;font-size:14px}.slot-workbench{margin:24px 0}.slot-workbench table{min-width:620px}.slot-workbench>p{font-size:14px}.lesson-sidebar a[href="#start-here"]{font-weight:650}
@media(max-width:640px){.detailed-start h2{font-size:22px}.detailed-start h3{font-size:19px}.setup-object,.custom-catalog,.lesson-block-card{padding:12px}.trigger-placement,.block-location{padding:13px}.microsteps>ol>li{padding:13px 12px 13px 46px!important;font-size:14px}.microsteps>ol>li:before{left:10px;top:16px;width:25px;height:25px;line-height:25px}.test-case{padding:14px}.block-location .block-path{font-size:14px}}

.editor-primer{max-width:1050px}.trigger-primer-card{margin-top:24px;scroll-margin-top:100px}.editor-primer h2{font-size:25px;line-height:1.7}.editor-primer h3{font-size:19px;margin-top:20px}.editor-primer li{margin:12px 0;line-height:1.9}.editor-primer section{line-height:1.9}.editor-primer .block-reference{display:inline-block;margin:5px}.wiring-walkthrough{margin:24px 0;padding:18px;background:var(--panel);border:1px solid var(--line);border-radius:12px}.wiring-walkthrough li{margin:14px 0;line-height:1.9}

.course-prerequisites{background:var(--panel2);border:1px solid var(--line);border-radius:12px;padding:16px;margin:18px 0;font-size:14px}.course-prerequisites h3{font-size:18px;margin-bottom:10px}.course-prerequisites ol{max-height:220px;overflow:auto}.course-prerequisites a{text-decoration:underline}
/* Evidence labels distinguish document review, web checks and native execution. */
.course-verification{margin:24px 0;padding:18px;background:var(--panel);border:2px solid var(--line);border-radius:14px}.verification-heading{display:flex;align-items:center;justify-content:space-between;gap:15px;flex-wrap:wrap}.verification-heading h2{font-size:21px;margin:0}.verification-heading a{font-size:13px;text-decoration:underline}.verification-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-top:16px}.verification-grid article{padding:15px;background:var(--panel);border:1px solid var(--line);border-radius:12px}.verification-grid h3{font-size:15px;margin:0 0 8px}.check-state{display:inline-block;padding:4px 9px;border-radius:7px;background:var(--panel2);color:#315d14;font-size:13px}.verification-grid [data-check-status="pending"] .check-state{background:#302637;color:#f1d6a4}.verification-grid p,.verification-scope{font-size:12px;line-height:1.9;margin-top:10px;color:var(--muted)}.evidence-report{max-width:1100px}.evidence-report section{margin:22px 0;padding:22px;border:1px solid var(--line);border-radius:14px}.evidence-report h2{font-size:23px}.evidence-report li{margin:12px 0}.evidence-table{max-height:600px;overflow:auto}.evidence-table table{width:100%;font-size:13px}.evidence-table tr[id]{scroll-margin-top:120px}@media(max-width:640px){.verification-grid{grid-template-columns:1fr}.course-verification{padding:14px}.verification-heading h2{font-size:19px}}
.detailed-variable-table{min-width:900px}.detailed-variable-table th,.detailed-variable-table td{vertical-align:top}.detailed-variable-table td:nth-child(4){min-width:260px}.detailed-variable-table td:nth-child(5){min-width:210px}.variable-evidence summary{cursor:pointer;font-size:13px;min-height:36px}.variable-evidence li{font-size:13px;line-height:1.9;margin:10px 0}.variable-evidence a{text-decoration:underline}li[id^="variable-step"]{scroll-margin-top:120px}

.dialog-zoom-controls{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.dialog-zoom-controls button{min-width:40px;min-height:40px}.dialog-zoom-controls [data-zoom-label]{font-size:13px;min-width:42px;text-align:center}@media(max-width:640px){.diagram-dialog-header{flex-wrap:wrap;gap:10px}.dialog-zoom-controls{gap:5px}}

.footer-tools{font-size:12px;line-height:1.9;flex-basis:100%;padding-top:12px}.footer-tools a{text-decoration:underline}.site-footer:has(.footer-tools){flex-wrap:wrap}

/* Reading and touch layout: keep the existing visual style across screen sizes. */
html{scroll-padding-top:calc(var(--site-header-height,7rem) + 1rem)}
.skip-link{top:12px;transform:translateY(calc(-100% - 24px))}.skip-link:focus{top:12px;transform:none}
.header-inner{height:auto;min-height:84px;flex-wrap:wrap;padding-block:12px;row-gap:10px}
.brand{min-width:0;max-width:100%}.brand>span{overflow-wrap:anywhere}
.header-inner nav{margin-left:auto;flex-wrap:wrap;gap:8px}
.header-inner nav a{display:flex;align-items:center;justify-content:center;min-height:44px;font-size:.875rem;white-space:nowrap}
button,input,select,summary,.button{min-height:44px}button{min-width:44px}
summary{cursor:pointer;line-height:1.7;padding-block:6px}
.article-content summary,.block-article summary,.learning-page summary,.bn-page summary{min-height:44px}
.article-content :is(p,li),.block-article :is(p,li),.editor-primer li,.evidence-report li,.learning-page p,.learning-page .learning-lesson-list>li,.bn-page .bn-card :is(p,li),.bn-page :is(.bn-form-hint,.bn-notice,.bn-output-note){font-size:1rem;line-height:1.85}
.article-content :is(.eyebrow,.recipe-number,.source-label,.lesson-source),.block-article .source-label,.learning-page .eyebrow{font-size:.875rem}
.article-content :is(.verification-grid p,.verification-scope),.learning-page .learning-record-note [data-progress-storage],.learning-lesson-panel .learning-storage-note{font-size:.875rem;line-height:1.8}
.learning-page :is(.learning-lesson-status,.learning-series>summary small,.learning-resume>small,.learning-progress-meter>div,.learning-series [data-series-progress]),.learning-card-status{font-size:.875rem}
.learning-page :is(.learning-clear,.learning-route-card .learning-next,.learning-route-card>details,.learning-prerequisites>details>summary),.bn-page :is(.bn-example,.bn-trace-controls button),.dialog-zoom-controls button,.diagram-toolbar button{font-size:.875rem;min-height:44px;min-width:44px}
.practice-filters label,.filter-panel label,.lesson-sidebar summary,.lesson-sidebar nav a,.lesson-sidebar .toc-series>summary,.lesson-sidebar .toc-series a,.diagram-toolbar,.diagram-text,.block-figure figcaption{font-size:.875rem}
.practice-filters input,.practice-filters select,.filter-panel input,.filter-panel select,.toc-search input,.bn-page .bn-form-grid input,.bn-page .bn-form-grid select{font-size:1rem;min-height:48px}
.course-info p,.practice-banner p:last-child,.manual-excerpt{font-size:1rem;line-height:1.75}
.learning-lesson-panel :is(.learning-lesson-panel-top p,.learning-lesson-panel-bottom),.learning-summary p,.learning-summary .button{font-size:.875rem}
.lesson-page :is(section[id],h2[id],h3[id],li[id]),.learning-page section[id],.learning-page .learning-route-card,.bn-section{scroll-margin-top:1rem}
.diagram-dialog{max-height:calc(100vh - 24px);max-height:calc(100dvh - 24px);max-width:calc(100vw - 24px)}
.diagram-dialog[open]{display:flex;flex-direction:column}.diagram-dialog-header{flex:none;flex-wrap:wrap;gap:10px}
.diagram-dialog .diagram-viewport{flex:1;min-height:0;max-height:none;overscroll-behavior:contain}
.diagram-toolbar>div,.dialog-zoom-controls{gap:8px}
.table-wrap,.bn-table-wrap{overscroll-behavior-x:contain}
.mobile-readable-table td{overflow-wrap:anywhere}
.table-wrap:has(.detailed-variable-table):before{content:'左右滑动查看完整表格';display:block;position:sticky;left:0;padding:10px 14px;font-size:.875rem;color:var(--muted);background:var(--panel)}
.home-study-tools{margin:0 0 30px}.home-study-tools .learning-summary{margin-bottom:16px}
.home-study-tools>nav{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}
.home-study-tools>nav a{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px 18px;border:1px solid var(--line);border-radius:12px;background:var(--panel);font-size:.875rem;min-height:48px}
.home-study-tools>nav a:hover{background:var(--panel2);border-color:#9fc67e}
.home-study-tools .learning-summary .button,.lesson-page .learning-lesson-panel .button{font-size:.875rem}
.guide-overview .button,.variable-evidence summary{min-height:44px;font-size:.875rem}.evidence-table table{font-size:.875rem}
.learning-page .learning-hero p:not(.eyebrow),.learning-page .learning-record-note p{font-size:1rem;line-height:1.85}
@media(min-width:769px){.lesson-sidebar,.filter-panel,.block-outline{top:calc(var(--site-header-height,7rem) + 16px)}.lesson-sidebar{max-height:calc(100dvh - var(--site-header-height,7rem) - 32px)}}
@media(max-width:1100px){
 .table-wrap:has(.mobile-readable-table):before{display:none}
 .mobile-readable-table{display:block;min-width:0!important;width:100%;font-size:1rem}
 .mobile-readable-table thead{position:absolute;width:1px;height:1px;padding:0;overflow:hidden;clip-path:inset(50%);white-space:nowrap}
 .mobile-readable-table tbody,.mobile-readable-table tr{display:block;width:100%}
 .mobile-readable-table tr{padding:10px 12px;border-bottom:1px solid var(--line)}.mobile-readable-table tr:last-child{border-bottom:0}
 .mobile-readable-table td{display:block;width:100%;min-width:0!important;max-width:none!important;padding:10px 0;border:0;font-size:1rem;white-space:normal}
 .mobile-readable-table td:before{content:attr(data-label);display:block;font-size:.875rem;font-weight:650;color:var(--mint);margin-bottom:5px}
 .mobile-readable-table td+td{border-top:1px dashed var(--line)}
 .learning-lesson-panel-top{flex-wrap:wrap}.learning-lesson-panel-top .button{flex-shrink:1}
}
@media(max-width:640px){
 .header-inner{min-height:0;padding-block:12px}.header-inner nav{width:100%;margin:0;gap:4px}
 .header-inner nav a{flex:1 0 calc((100% - 12px)/4);min-width:max-content;padding:8px 4px;font-size:.875rem}
 .shell{padding-inline:max(16px,env(safe-area-inset-left)) max(16px,env(safe-area-inset-right))}
 .home-study-tools>nav{grid-template-columns:1fr;gap:10px}.home-study-tools>nav a{font-size:1rem}
 .lesson-article,.block-article{padding-inline:16px}.preparation-body{padding-inline:12px}
 .microsteps>ol>li{font-size:1rem;padding:14px 12px 14px 44px!important;line-height:1.9}
 .microsteps>ol>li:before{left:9px;top:16px}
 .practice-filters{grid-template-columns:1fr}.practice-filters label,.practice-filters label:first-child,.practice-filters button{grid-column:auto}
 .learning-page .learning-hero{grid-template-columns:1fr;position:relative;padding-right:0}
 .learning-page .learning-hero h1{font-size:2rem}.learning-page .learning-hero-art{display:none}
 .learning-page .learning-lesson-list>li{align-items:flex-start;flex-direction:column;gap:4px;padding-block:10px}
 .learning-page .learning-series>summary{flex-wrap:wrap;gap:8px}.learning-page .learning-series>summary>span:first-child{flex-basis:60%}
 .learning-page .learning-series [data-series-progress]{white-space:normal}
 .bn-page .bn-trace-controls{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}
 .bn-page .bn-trace-controls button{padding:10px 8px}.bn-page .bn-examples{gap:8px}.bn-page .bn-example{padding:10px 12px}
 .diagram-dialog-header{padding:12px}.dialog-zoom-controls{gap:8px}
 .footer-tools{font-size:.875rem}.footer-tools a{display:inline-flex;align-items:center;min-height:44px}
}

/* Crystal material and composition. Dense reading areas use opaque surfaces for legibility. */
body:not([data-page="login"]){background:var(--bg);isolation:isolate}
body:not([data-page="login"]):before{content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;background:radial-gradient(ellipse at 0 12%,#153b6f45,transparent 44%),radial-gradient(ellipse at 100% 28%,#65418438,transparent 40%),radial-gradient(ellipse at 55% 100%,#1d244826,transparent 45%)}
.shell{max-width:1280px}
::selection{background:#415276;color:#fff}
h1,h2,h3{font-weight:650;letter-spacing:-.025em}h1{line-height:1.4}h2{font-size:28px}h3{font-size:19px}
a,button{transition:color .2s,background .2s,border-color .2s,box-shadow .2s,transform .2s}
:focus-visible{outline:2px solid #8fd6ee;outline-offset:4px}
.site-header{background:#0a0b14d9;border-bottom:1px solid var(--crystal-border);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px)}
.header-inner{min-height:82px;gap:22px;padding-block:12px}.brand{color:var(--text);font-size:18px;font-weight:600;gap:12px}.brand img{border-radius:0;width:39px;height:39px}.brand small{color:var(--muted);font-size:10px;letter-spacing:.12em;margin-top:2px}
.header-inner nav{gap:6px}.header-inner nav a{font-size:13px;font-weight:400;border:1px solid transparent;border-radius:10px;padding:8px 15px;color:#c3bfd3}.header-inner nav a:hover{background:#ffffff08;color:#fff}.header-inner nav a[aria-current]{background:#a2cfe913;border-color:#a2cfe92a;color:#c2e4f1}
.button{min-height:46px;border:1px solid #73768c66;border-radius:24px;background:#c1c6ed08;color:var(--text);font-weight:500;font-size:14px;padding:11px 23px;box-shadow:inset 0 1px 0 #ffffff07}
.button:hover{background:#8d9bbb19;color:#fff;border-color:#afcddd99;box-shadow:0 6px 26px #0505124d;transform:translateY(-1px)}.button:active{transform:translateY(1px);box-shadow:none}
.button-blue,.home-search button{background:linear-gradient(108deg,#205364,#344364)!important;color:#fff!important;border:1px solid #8abcce65!important;box-shadow:inset 0 1px 0 #c3e9fb15,0 5px 24px #2d83b21a}
.button-blue:hover,.home-search button:hover{background:linear-gradient(108deg,#29687b,#425479)!important;border-color:#afd8e8!important;box-shadow:0 6px 26px #42779935}.button-blue:active{box-shadow:none}.button-white{background:#aab4d40a}
.text-link,.text-link:hover{color:#a3d7e8;font-weight:500}.eyebrow{color:#b8cbe1;font-weight:500;font-size:12px}
input,select,textarea{color:var(--text);background:#0c0d17;border:1px solid #686c865e;border-radius:10px;caret-color:#a3d7e8}input::placeholder,textarea::placeholder{color:#a6a2b8;opacity:1}input:focus,select:focus,textarea:focus{outline:2px solid #8fd6ee;outline-offset:2px}select option{color:var(--text);background:#141521}
.home-intro{grid-template-columns:1.05fr 1fr;gap:45px;min-height:640px;padding:70px 12px 74px;position:relative}.hero-copy{text-align:left;animation:none;z-index:1}.hero-kicker{font-size:13px;color:#bdb4d6;margin-bottom:22px}.home-intro h1{font-size:clamp(38px,4.1vw,56px);font-weight:600;letter-spacing:-.045em;line-height:1.4;color:#f3f1fa;margin-bottom:22px}.hero-description{font-size:15px;line-height:2;color:#bcb7ce;margin-bottom:31px}.hero-actions{flex-direction:row;flex-wrap:wrap;max-width:none;margin:0;gap:13px}.hero-actions .button{width:auto;min-height:49px;font-size:14px;padding-inline:25px}.hero-free{color:#aaa7be;font-size:12px;margin-top:23px}
.crystal-studio{position:relative;display:grid;place-items:center;min-width:0;height:465px;isolation:isolate}.crystal-studio:before{content:"";position:absolute;inset:30px -20px;background:radial-gradient(ellipse at 27% 64%,#144e9060,transparent 58%),radial-gradient(ellipse at 85% 35%,#764ea963,transparent 64%);filter:blur(20px);z-index:-2;pointer-events:none}
.studio-crystal{position:absolute;height:auto;pointer-events:none;z-index:2;filter:drop-shadow(0 10px 20px #02030b55)}.studio-crystal-long{width:162px;right:6px;top:-22px;rotate:16deg}.studio-crystal-chunk{width:190px;bottom:-2px;left:-38px;rotate:-15deg}
.studio-glass{position:relative;width:calc(100% - 54px);max-width:377px;padding:22px 28px 31px;text-align:center;border:1px solid #b9bbdb30;border-radius:20px 20px 40px 40px;background:linear-gradient(130deg,#111726bd,#201b3080);box-shadow:inset 1px 1px 0 #e4ecff0b,0 28px 60px #00000038;backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px)}
.studio-caption{display:flex;align-items:center;justify-content:space-between;color:#bbb6cf;font-size:11px;text-align:left}.studio-dots{font-size:26px;line-height:1;letter-spacing:3px}.studio-tree{width:60px;height:60px;margin:18px 0 13px;filter:drop-shadow(0 0 24px #b2eff32b)}.studio-glass h2{font-size:23px;font-weight:500;letter-spacing:.01em}.studio-glass>p{font-size:11px;color:#b5afc9;margin-top:9px}.studio-blocks{display:flex;flex-direction:column;text-align:left;margin:27px 0 25px;align-items:flex-start;padding-left:8px}.studio-blocks>span{display:flex;align-items:center;gap:8px;min-height:40px;padding:9px 13px;font-size:11px;line-height:1.5;border:1px solid;border-radius:9px;position:relative}.studio-event{background:#443322;border-color:#c49c5666!important;color:#f5d294}.studio-event:before{content:"";position:absolute;top:-5px;left:12px;width:22px;height:6px;border-radius:8px 8px 0 0;background:#745130}.studio-action{background:#233353;border-color:#85a9e45c!important;color:#d7e8ff;margin-top:5px;margin-left:12px}.studio-action b{font-size:10px;font-weight:500;border:1px solid #9abfe342;border-radius:8px;padding:2px 8px;background:#0b182b66}.studio-blocks i{width:6px;height:6px;border-radius:50%;background:currentColor;opacity:.8}.studio-footnote{font-size:10px;color:#aba5be}
.learning-strip{border:1px solid var(--crystal-border);background:linear-gradient(100deg,#151a29aa,#211b2b88);border-radius:18px;padding:12px 15px;gap:0}.learning-strip>a{font-size:15px;border-radius:10px;gap:15px;min-height:76px}.learning-strip>a+ a{border-left:1px solid var(--crystal-border);border-radius:0}.learning-strip>a:hover{background:#c0b9ed07}.learning-strip small{font-size:11px;color:var(--muted)}.strip-icon,.strip-icon.blue,.strip-icon.purple{border:1px solid #b2c4e528;background:#99bed411;color:#a8d9e8;width:43px;height:43px;border-radius:12px}.strip-icon.purple{color:#d0b6ee;background:#c6aff811}.strip-icon svg{width:23px;height:23px}
.learning-section,.topic-section{margin-top:68px}.section-title{margin-bottom:26px}.section-title h2{font-size:28px;font-weight:600}.section-title p{font-size:14px;color:var(--muted)}
.learning-layout{grid-template-columns:minmax(0,1.3fr) minmax(0,.8fr);gap:40px;align-items:stretch}.foundation-list{max-width:none;gap:0}.foundation-list>a,.foundation-list>a:nth-child(n){margin-left:0;padding:16px 13px;min-height:90px;border-bottom:1px solid var(--crystal-border);gap:21px}.foundation-list>a:before{display:none}.path-number{width:46px;height:46px;border-radius:14px;border:1px solid #b1c9eb38;background:linear-gradient(140deg,#23404b70,#35314870);box-shadow:inset 0 1px 0 #ffffff0a;color:#cbe7f3;font-size:19px;font-weight:500}.foundation-list>a:hover{background:#a2b8d205;border-radius:12px}.foundation-list>a:hover .path-number{background:#33405b}.foundation-list>a:active .path-number{box-shadow:none;transform:none}.foundation-list h3{font-size:17px;font-weight:500}.foundation-list p{color:var(--muted);font-size:12px}.path-chevron{color:#abb8d3}
.learning-note{max-width:none;background:linear-gradient(135deg,#151b2dbb,#261d3099);border:1px solid var(--crystal-border);border-radius:22px;padding:37px 28px}.learning-note img{width:80px;height:98px;filter:drop-shadow(0 8px 16px #0004)}.learning-note h3{font-size:21px;font-weight:500}.learning-note p{color:var(--muted);font-size:14px}.note-tip{color:var(--muted)}.note-tip svg{color:#a3d7e8}.learning-note .button{color:#cde4ef}
.play-section{border:1px solid var(--crystal-border);border-radius:28px;background:linear-gradient(130deg,#111a29cc,#211a2c9c);margin-top:65px;padding:40px 55px;gap:65px}.play-copy h2{font-size:32px;font-weight:500}.play-copy p,.play-note{color:var(--muted)}.play-icon{background:#a2c8e211;color:#b8ddee;border:1px solid #a2c8e222}.demo-sheet{background:linear-gradient(140deg,#1d2334bb,#252136aa);border:1px solid #aaa8d135;box-shadow:0 18px 40px #03031030,inset 0 1px 0 #fff1;border-radius:20px}.sheet-heading{color:var(--muted)}.sheet-heading>span:last-child{background:#a3d7e817;color:#c8e7f2}.demo-board{background:#080b1566;border:1px solid #adbddd19}.demo-tile{border:1px solid #e4e7f34d;box-shadow:0 4px 12px #03071055,inset 0 2px 10px #fff2}.tile-gold{--tile-color:#97753c;--tile-shadow:#624c2b}.tile-blue{--tile-color:#35748d;--tile-shadow:#235468}.tile-coral{--tile-color:#8b567d;--tile-shadow:#683e5e}.demo-footnote,.stage-console p{color:var(--muted)}
.topic-grid{gap:16px}.topic-card{border:1px solid var(--crystal-border);background:linear-gradient(135deg,#181d2caa,#201a2a99);box-shadow:inset 0 1px 0 #ffffff06;border-radius:18px;padding:25px;transition:border-color .2s,background .2s,transform .2s}.topic-card:hover{background:#232334;color:var(--text);border-color:#9aafca66;box-shadow:0 10px 25px #0002;transform:translateY(-2px)}.topic-card:active{transform:translateY(0);box-shadow:none}.topic-icon,.topic-blue .topic-icon,.topic-purple .topic-icon{border:1px solid #a9bad333;background:#a3d7e810;color:#a3d7e8}.topic-purple .topic-icon{color:#d0b6ee;background:#c6aff810}.topic-card h3{font-size:19px;font-weight:500}.topic-card p{color:var(--muted)}.topic-count{color:#aed7e8;font-weight:500}.curriculum-path-number{background:#a3d7e810;border:1px solid #a3d7e822;color:#c3deed;font-weight:500}
.search-dock,.home-study-tools>nav a{border:1px solid var(--crystal-border);background:#171a28a6}.home-study-tools>nav a:hover{background:#252b3d;border-color:#7e9dbd80}.search-dock{padding:29px;margin-top:60px}.search-symbol{color:#a3d7e8}.home-search{border:1px solid #8896b252;background:#0b0d18;box-shadow:inset 0 1px 8px #0002}.home-search input{background:transparent;color:var(--text)}.home-search button{border-radius:9px}.search-dock p{color:var(--muted)}
.page-heading{padding:48px 0 32px;position:relative}.page-heading h1{color:var(--text);font-size:clamp(29px,3vw,40px);font-weight:500}.page-heading>p:last-child{color:var(--muted)}
.course-map-layout{grid-template-columns:minmax(0,1fr) 265px;gap:28px}.course-grid{gap:16px}.course-card,[data-page="courses"] .course-card{border:1px solid var(--crystal-border);border-radius:17px;background:linear-gradient(125deg,#181d2bbb,#1e1a2baa);box-shadow:inset 0 1px 0 #ffffff06;padding:24px;gap:19px;min-height:0}.course-card:hover,[data-page="courses"] .course-card:hover{background:#242536;color:var(--text);border-color:#7794b566;box-shadow:none;transform:translateY(-1px)}.course-card:active{transform:none;box-shadow:none}
[data-page="courses"] .course-grid{gap:15px}[data-page="courses"] .course-card:nth-child(n){margin-left:0}[data-page="courses"] .course-card:after{display:none}[data-page="courses"] .page-heading{border-bottom:1px solid var(--crystal-border);margin-bottom:24px}
.course-visual,[data-page="courses"] .course-visual{width:46px;padding-top:2px}.course-number,[data-page="courses"] .course-number{border:1px solid #a5c1dc38;background:#a5c1dc10;color:#c8e0ef;border-radius:12px;width:44px;height:44px;font-size:17px;box-shadow:none;font-weight:500}.course-info h2,[data-page="courses"] .course-info h2{font-size:19px;font-weight:550}.course-info p{color:var(--muted);font-size:15px}.course-category,.card-bottom{color:#b0acc4;font-size:12px}.round-arrow{color:#b2dced}[data-page="courses"] .course-card:active .course-number{translate:none;box-shadow:none}
.journey-guide{border:1px solid var(--crystal-border);background:linear-gradient(145deg,#1d2635a8,#2b213399);border-radius:20px;margin-top:0;top:calc(var(--site-header-height,7rem) + 16px)}.journey-guide h2{font-weight:500}.journey-guide p{color:var(--muted)}.journey-guide img{width:80px;height:98px}.next-stop{border-top:1px solid var(--line)}
.series-nav a{background:#171824;border:1px solid #8e90ad3d;box-shadow:none;border-radius:24px;font-size:13px;font-weight:500}.series-nav a:hover{background:#29283c}.series-nav a[aria-current]{background:#3144568a;border-color:#92bdd665;color:#d4ebf5;box-shadow:none}
.practice-filters{border:1px solid var(--crystal-border);background:#141823bd;border-radius:17px}.practice-filters input,.practice-filters select{background:#0c0d17}.all-series>summary{color:#bfdbe8}.practice-banner,#match3 .practice-banner,#gameplay .practice-banner,#basics .practice-banner{background:linear-gradient(110deg,#1c2a3db3,#31213791);border:1px solid var(--crystal-border);border-radius:19px;min-height:145px}.practice-banner h2,#match3 .practice-banner h2,#gameplay .practice-banner h2,#basics .practice-banner h2{color:#eeeaf8;font-weight:500}.practice-banner .eyebrow,.practice-banner p:last-child,#match3 .practice-banner p,#gameplay .practice-banner p,#basics .practice-banner p{color:#c0bbd4}.practice-banner img{width:74px;height:90px}
.lesson-article,.block-article{background:#11131ff2;border:1px solid #aaacca2b;border-radius:20px;box-shadow:0 18px 55px #0000001a}.lesson-article{padding:35px 39px 0}.article-header{border-bottom:1px solid var(--line);padding-bottom:28px}.article-header h1{font-weight:500;font-size:32px;line-height:1.55}.article-header .eyebrow{color:var(--muted)}.article-content li{color:#d5d2e3}.lesson-sidebar nav a{border:1px solid transparent;color:#b9b5cc;font-size:13px}.lesson-sidebar nav a:hover{background:#b3c5df0b;color:#e7e2f5}.lesson-sidebar nav a[aria-current]{background:#28425875;border-color:#8ec1d334;color:#c6e8f4}.lesson-sidebar nav a>span{color:#a7cce0}.course-outline,.lesson-outline>summary{border-color:#aaacca2b;border-width:1px}.lesson-sidebar details{background:transparent}.lesson-sidebar .toc-search input{background:#0c0d17}.tag,.pill{background:#a3d7e812;color:#c6e6ef;border:1px solid #a3d7e820;font-weight:400}.guide-overview strong{color:var(--text)}
.lesson-preparation{border-width:1px}.lesson-preparation>summary{background:#1b1e2c;color:#f0edf8}.lesson-preparation>summary small{color:var(--muted)}.preparation-body{border-top-width:1px}.recipe-step{border-top-width:1px}.recipe-step h3{font-weight:550}.recipe-notation,.concept-review,.long-parameter,.original-text,.setup-object,.custom-catalog,.lesson-block-card{background:#171a28;border-color:#3a3c52}.lesson-callout,.callout{background:#1b2a3a;color:#cee3f1;border-color:#659bb5}.recipe-check{background:#1b302e;color:#bbdfd0;border-color:#608f85}.warning{background:#302735;color:#f1d6a4;border-color:#af9160}.trigger-placement{background:#192737;border:1px solid #405469}.trigger-placement article+article{border-color:#405469}.block-location{background:#192434;border-color:#739dbb}.microsteps>ol>li{border-color:#35384b;background:#151824}.microsteps>ol>li:before{background:#a3d7e814;color:#c6e8f4}.test-case,.wiring-walkthrough{background:#181c2a}.course-prerequisites{background:#192536;border-color:#465870}.course-verification{background:#161b28;border-width:1px}.verification-grid article{background:#111621;border-color:#333b51}.check-state{background:#253c37;color:#b2e5cc}.verification-grid [data-check-status="pending"] .check-state{background:#3d302a;color:#f2d4aa}
th{background:#202537;color:#d4d9e9}.table-wrap:has(.detailed-variable-table):before{background:#1a1e2d}.lesson-code-wrap{background:#0c101a;border-color:#353b50}.lesson-code-wrap:before{background:#1b2230;color:#bdc5d9;border-color:#353b50}pre{color:#ced4e8}p code,li code{background:#283044;color:#bfdfef}.copy-code{background:#1a2535;color:#c4e6f5;border:1px solid #5c7e97}.block-reference{background:#1d2b3c;border-color:#465971;color:#bfdfef}.recipe-series a[aria-current]{background:#284258!important;color:#e2f2fc!important;border-color:#779fb8}.block-lead{color:#c5c0d8}.block-outline,.filter-panel{background:#151923cc;border:1px solid #a7b3d02d;backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px)}
.filter-panel label{color:#d0cadf}.filter-panel input,.filter-panel select{background:#0c0d17;border-color:#686c865e}.manual-result{background:#151925b8;border:1px solid var(--crystal-border)}.manual-result:hover{background:#222638;border-color:#92b4d266;color:var(--text)}.manual-excerpt{color:var(--muted)}.manual-status{border-bottom-width:1px}
.block-kind[data-kind="事件"]{background:#3c321b;color:#ffc84c}.block-kind[data-kind="动作"]{background:#1d3049;color:#a0c9ff}.block-kind[data-kind="控制"]{background:#32223f;color:#d0abff}.block-kind[data-kind="条件"]{background:#412d24;color:#ffba8c}.block-kind[data-kind="取值"]{background:#203b2d;color:#9fefc4}
.block-figure{background:#242632;border-color:#515369}.diagram-toolbar{background:#1b2030;color:#d0d4e6;border-color:#4a4d65}.diagram-toolbar button{background:#293045;border-color:#616a85;color:#e6eaff}.diagram-toolbar button:hover{background:#3b4560}.diagram-save{color:#bbe5f4}.block-figure figcaption{color:#c3c7d4}.empty-state{background:#191c2a}.site-footer{border-top:1px solid var(--crystal-border);color:var(--muted)}.site-footer strong{color:#dedbed;font-weight:500}.site-footer>span{color:var(--muted)}.toast{background:#263d50;border:1px solid #7cabcb80;color:#f3f1fa;box-shadow:0 10px 25px #0005}.skip-link{background:#1d4051;color:#fff}.skip-link:hover{color:#fff}
@supports not ((backdrop-filter:blur(1px)) or (-webkit-backdrop-filter:blur(1px))){.site-header{background:#0e101a}.studio-glass,.filter-panel,.block-outline{background:#181d2b}}
@media(max-width:1050px){.home-intro{gap:18px;padding-inline:0;min-height:570px}.home-intro h1{font-size:43px}.crystal-studio{height:420px}.studio-glass{padding-inline:21px}.studio-crystal-long{width:140px;right:12px}.studio-crystal-chunk{width:175px;left:-25px;bottom:6px}.hero-actions .button{padding-inline:20px}.course-map-layout{grid-template-columns:minmax(0,1fr) 225px;gap:22px}.play-section{padding:35px;gap:35px}.lesson-article{padding:28px 27px 0}}
@media(max-width:850px){.header-inner{gap:12px}.header-inner nav a{padding-inline:10px}.brand{font-size:16px}.home-intro h1{font-size:38px}.hero-actions{gap:10px}.hero-actions .button{padding:11px 18px;font-size:13px}.crystal-studio{height:395px}.studio-glass{width:calc(100% - 18px);padding:19px 18px 27px}.studio-crystal-long{width:110px;right:-13px;top:-13px}.studio-crystal-chunk{width:155px;left:-33px;bottom:-15px}.studio-blocks{padding-left:0}.studio-blocks>span{font-size:10px}.studio-action{margin-left:5px}.studio-action b{padding-inline:6px}.hero-description{font-size:14px}.learning-layout{gap:22px}.play-copy h2{font-size:28px}}
@media(max-width:768px){.course-map-layout{grid-template-columns:1fr}.journey-guide{display:none}.lesson-sidebar details{background:#151a28;border:1px solid #a7b3d033}.home-intro{grid-template-columns:1fr 1fr}.home-intro h1{font-size:34px}.hero-free{font-size:11px}.library-layout{grid-template-columns:1fr}.filter-panel{position:static}.block-outline{width:100%}}
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@media(max-width:370px){.brand{font-size:14px}.header-inner nav a{font-size:11px}.home-intro h1{font-size:32px}.hero-actions .button{font-size:12px;padding-inline:17px}.crystal-studio{height:361px}.studio-glass{width:calc(100% - 24px);padding-inline:18px}.studio-crystal-long{width:106px;right:-2px}.studio-crystal-chunk{width:147px;left:-7px}.learning-strip>a{font-size:11px}.learning-strip small{font-size:9px}.course-card,[data-page="courses"] .course-card{gap:11px;padding:18px 13px}.article-header h1{font-size:24px}}
.lesson-sidebar nav a span{opacity:1}
.studio-glass{z-index:1}.studio-crystal-chunk{z-index:0}
@media(max-width:850px){.crystal-studio:before{inset:30px 0}.studio-crystal-long{right:12px}.studio-crystal-chunk{left:10px}}
@media(max-width:640px){.studio-crystal-long{right:15px}.studio-crystal-chunk{left:15px}}
@media(prefers-reduced-motion:reduce){a,button,.topic-card,.course-card{transition:none}.button:hover,.topic-card:hover,.course-card:hover{transform:none}}