@font-face{font-family:"Source Han Sans SC Web";src:url("assets/fonts/SourceHanSansSC-Light.woff2") format("woff2");font-weight:300;font-style:normal;font-display:swap}
@font-face{font-family:"Source Han Sans SC Web";src:url("assets/fonts/SourceHanSansSC-Regular.woff2") format("woff2");font-weight:400;font-style:normal;font-display:swap}
@font-face{font-family:"Source Han Sans SC Web";src:url("assets/fonts/SourceHanSansSC-Bold.woff2") format("woff2");font-weight:700;font-style:normal;font-display:swap}
:root{--paper:#fffdf7;--ink:#232621;--muted:#63655e;--red:#b92d24;--line:#deddd3;--soft:#f3f1e8;--font:"Source Han Sans SC Web","Source Han Sans SC","思源黑体",sans-serif;color-scheme:light;font-family:var(--font);font-synthesis:none}
html{scrollbar-gutter:stable}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-size:16px;-webkit-font-smoothing:antialiased}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button{color:inherit;cursor:pointer}button:disabled{cursor:default}button,a,input,select{outline:none;outline-offset:4px}:root.keyboard-navigation button:focus-visible,:root.keyboard-navigation a:focus-visible,:root.keyboard-navigation input:focus-visible,:root.keyboard-navigation select:focus-visible{outline:2px solid var(--red)}#catalog:focus,.poster-dialog:focus{outline:none}a{color:inherit;text-decoration:none}svg{display:block;fill:none;stroke:currentColor;stroke-width:1.65;stroke-linecap:round;stroke-linejoin:round}button svg{width:20px;height:20px;flex-shrink:0}[hidden]{display:none!important}.skip-link{position:fixed;z-index:100;top:12px;left:12px;transform:translateY(-180%);background:var(--ink);color:white;padding:12px 20px}.skip-link:focus{transform:translateY(0)}.page-edge{height:7px;background:var(--red)}
.site-header{max-width:1440px;margin:0 auto;padding:25px 48px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:13px;font-size:29px;font-weight:700;letter-spacing:1px}.brand-mark{width:42px;height:42px;display:block;object-fit:contain;border-radius:8px;flex-shrink:0}.header-edition{font-size:14px;font-weight:400;color:var(--muted);display:flex;align-items:center;gap:18px}.edition-year{border-left:1px solid var(--line);padding-left:18px;font-variant-numeric:tabular-nums}.site-main{max-width:1440px;margin:0 auto;padding:0 48px}.masthead{display:flex;justify-content:space-between;align-items:center;padding:33px 0 29px;gap:24px}.eyebrow{font-size:13px;font-weight:700;letter-spacing:.12em;color:var(--muted);margin:0 0 13px}h1{font-size:clamp(36px,4.15vw,58px);letter-spacing:-.055em;font-weight:700;line-height:1.16;margin:0}.title-period{color:var(--red)}.collection-count{display:flex;align-items:center;gap:29px;flex-shrink:0}.collection-count>div{display:flex;align-items:baseline;gap:8px}.collection-count strong{font-size:45px;line-height:1.2;font-weight:300;letter-spacing:-.06em;font-variant-numeric:tabular-nums}.collection-count span:not(.count-divider){color:var(--muted);font-size:13px}.count-divider{height:29px;width:1px;background:var(--line)}
.browse-controls{margin:0 0 35px;border-top:1px solid var(--line)}.control-topline{display:flex;align-items:center;justify-content:space-between;gap:28px;padding:16px 0}.category-tabs{display:flex;align-items:center;gap:4px;flex-wrap:wrap}.category-tab{border:0;background:transparent;border-radius:4px;font-size:14px;padding:11px 13px;font-weight:400;white-space:nowrap;transition:background .16s,color .16s}.category-tab:hover{background:var(--soft)}.category-tab.active{background:var(--red);color:var(--paper)}.category-tab span{font-size:12px;margin-left:5px;opacity:.8}.search-field{display:flex;align-items:center;gap:9px;background:#f3f1e9;border:1px solid transparent;padding:10px 12px;width:248px;border-radius:4px;flex-shrink:0;min-height:43px}.search-field:focus-within{border-color:#8c8e81}.search-field svg{height:18px;width:18px;flex-shrink:0}.search-field input{border:0;background:transparent;width:100%;font-size:14px;min-width:0;color:var(--ink);outline:none}.search-field input::placeholder{color:var(--muted)}.search-field kbd{font-family:inherit;border:1px solid #d2d2c7;padding:0 5px;line-height:20px;font-size:13px;color:var(--muted)}.control-bottomline{display:flex;justify-content:space-between;gap:15px;align-items:center;padding:11px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.collection-section{margin-bottom:51px;--section-color:var(--red)}.section-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:22px;gap:20px;background:var(--section-color);color:var(--paper);padding:15px 21px;position:relative}.section-heading{display:flex;align-items:baseline;gap:16px;min-width:0}.section-number{font-size:13px;font-weight:400;letter-spacing:.06em;opacity:.7;font-variant-numeric:tabular-nums}.section-header h2{font-size:24px;font-weight:700;letter-spacing:.04em;margin:0;line-height:1.2}.section-count{font-size:13px;white-space:nowrap;opacity:.85}.poster-grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));column-gap:24px;row-gap:29px}.course-card{min-width:0}.poster-button{border:0;padding:0;background:var(--soft);display:block;width:100%;position:relative;aspect-ratio:3/4;overflow:hidden;border-radius:2px;box-shadow:0 2px 7px #2020190b;transition:box-shadow .2s,transform .2s}.poster-button:hover{box-shadow:0 7px 21px #20201924;transform:translateY(-4px)}.poster-button img{height:100%;width:100%;object-fit:contain;display:block;transition:filter .2s}.poster-button::after{content:"";position:absolute;inset:0;border:1px solid #24281e0b;pointer-events:none}.card-details{padding-top:12px}.card-title{font-size:16px;line-height:1.5;font-weight:700;margin:0 0 5px;letter-spacing:-.025em}.card-meta{font-size:12px;line-height:1.5;display:flex;gap:0;color:var(--muted);align-items:center;flex-wrap:wrap}.card-meta-item{white-space:nowrap}.card-meta .meta-separator{color:#b7b9ac}.empty-state{padding:70px 0 110px;text-align:center}.empty-state h2{font-size:21px;font-weight:400;margin:0 0 25px}.empty-state button{border:1px solid var(--line);background:var(--paper);border-radius:4px;padding:12px 24px}.site-footer{border-top:1px solid var(--line);padding:29px 0 37px;display:flex;align-items:center;gap:25px;color:var(--muted);font-size:13px}.footer-brand{font-size:22px;font-weight:700;letter-spacing:.07em;color:var(--ink)}.footer-count{margin-left:auto;font-variant-numeric:tabular-nums}.noscript-notice{padding:25px;border:1px solid var(--line)}
@media(min-width:1580px){.site-main,.site-header{max-width:1560px}.poster-grid{gap:30px}.site-main{padding:0 56px}.site-header{padding:25px 56px}}
@media(max-width:1150px){.site-main{padding:0 32px}.site-header{padding:23px 32px}.control-topline{gap:12px}.category-tab{font-size:13px;padding:10px 9px}.search-field{width:210px}.poster-grid{column-gap:20px}.collection-count{gap:22px}.collection-count strong{font-size:38px}}
@media(max-width:940px){.control-topline{flex-wrap:wrap}.category-tabs{width:100%}.search-field{width:100%}.search-field kbd{display:none}.poster-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:24px 19px}.masthead{padding-top:30px}.collection-count strong{font-size:34px}.collection-count{gap:17px}}
@media(max-width:690px){.site-main{padding:0 21px}.site-header{padding:20px 21px}.brand{font-size:25px;gap:10px}.brand-mark{height:35px;width:35px;font-size:25px}.header-edition{font-size:12px;gap:0}.edition-year{display:none}.masthead{padding:27px 0 25px;align-items:flex-end}.eyebrow{font-size:12px;letter-spacing:.07em;margin-bottom:11px}h1{font-size:39px;line-height:1.15}.collection-count{gap:13px;align-items:flex-end}.collection-count>div{display:flex;flex-direction:column;gap:3px}.collection-count strong{font-size:31px}.collection-count span:not(.count-divider){font-size:12px}.count-divider{height:32px;margin-bottom:5px}.category-tabs{gap:3px}.category-tab{padding:10px 9px}.category-tab span{display:none}.control-topline{padding-top:8px;gap:14px}.control-bottomline{align-items:flex-start;padding:13px 0;gap:10px}.browse-controls{margin-bottom:27px}.poster-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:24px 14px}.section-header{padding:14px 15px;margin-bottom:18px}.section-header h2{font-size:21px}.section-heading{gap:12px}.section-count{font-size:12px}.section-number{font-size:12px}.card-title{font-size:14px;line-height:1.5}.card-meta{font-size:12px;gap:0}.collection-section{margin-bottom:37px}.site-footer{gap:13px;flex-wrap:wrap;padding:25px 0 30px}.footer-brand{font-size:21px}.site-footer>span{font-size:12px}.footer-count{width:100%;margin-left:0}}
@media(max-width:440px){.site-main{padding:0 17px}.site-header{padding:19px 17px}.header-edition{font-size:12px}.masthead{gap:14px}h1{font-size:34px}.collection-count{gap:10px}.collection-count strong{font-size:27px}.collection-count>div{gap:3px}.count-divider{height:26px}.masthead .eyebrow{font-size:12px}.poster-grid{grid-template-columns:repeat(2,minmax(0,1fr));column-gap:15px;row-gap:24px}.category-tab{padding:9px 8px;font-size:13px}.category-tabs{gap:2px}.section-header{padding:13px 13px}.section-header h2{font-size:20px}.card-title{font-size:15px}.collection-section{margin-bottom:34px}.section-heading{gap:10px}.section-number{font-size:12px}.section-count{font-size:12px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}.poster-button:hover{transform:none}}
@media print{.browse-controls,.site-header,.site-main{max-width:none;padding:0}.masthead{padding:0 0 16px}h1{font-size:28px}.collection-section{break-inside:avoid;margin-bottom:20px}.section-header{background:white;color:black;border-bottom:2px solid var(--section-color);padding:8px 0}.poster-grid{grid-template-columns:repeat(5,minmax(0,1fr));gap:12px}.card-title{font-size:12px}.card-meta{font-size:10px}.poster-button{box-shadow:none}.course-card{break-inside:avoid}}

/* 课程详情：三项文案与一张横版海报。 */
.poster-dialog{width:calc(100vw - 64px);max-width:1440px;max-height:calc(100dvh - 48px);padding:0;border:0;background:#fff;color:var(--ink);border-radius:0;box-shadow:0 15px 70px #0005;overflow:auto}
.poster-dialog::backdrop{background:#000b}
.dialog-layout{display:grid;grid-template-columns:minmax(220px,.85fr) minmax(0,1.8fr);align-items:center;gap:48px;padding:72px 42px 56px}
.dialog-details{min-width:0}
.dialog-details h2{font-size:clamp(25px,2.7vw,38px);font-weight:700;line-height:1.3;letter-spacing:-.04em;margin:0 0 14px}
.dialog-age{font-size:16px;margin:0;color:var(--ink)}
.dialog-tags{font-size:14px;line-height:1.6;color:var(--muted);margin:8px 0 0;overflow-wrap:anywhere}
.dialog-intro{font-size:18px;line-height:1.75;margin:40px 0 0;max-width:20em;white-space:pre-line;overflow-wrap:anywhere}
.poster-stage{display:flex;align-items:center;justify-content:center;position:relative;min-width:0;aspect-ratio:16/9}
.poster-stage>img{display:block;width:100%;height:auto;max-height:calc(100dvh - 180px);object-fit:contain}
.dialog-close{position:absolute;z-index:2;right:20px;top:18px;border:0;background:transparent;width:44px;height:44px;display:grid;place-items:center}
.dialog-close svg{height:27px;width:27px}
.course-navigation{display:flex;gap:32px;align-items:center;margin-top:38px}
.course-navigation button{display:grid;place-items:center;width:44px;height:44px;border:0;background:transparent}
.course-navigation button svg{height:25px;width:25px}
.course-navigation button:hover:not(:disabled){background:var(--soft)}
.course-navigation button:disabled{opacity:.25}
.image-error{display:grid;gap:15px;text-align:center;position:absolute;font-size:14px}
.image-error button{padding:9px 14px;border:1px solid var(--line);background:#fff}
body.dialog-open{overflow:hidden}
@media(max-width:940px){.dialog-layout{grid-template-columns:minmax(180px,.8fr) minmax(0,1.5fr);gap:28px;padding:65px 30px 40px}.dialog-details h2{font-size:27px}.dialog-intro{font-size:16px;margin-top:28px}.course-navigation{margin-top:24px;gap:20px}}
@media(max-width:690px){.poster-dialog{width:calc(100vw - 24px);max-height:calc(100dvh - 24px)}.dialog-layout{display:flex;flex-direction:column;gap:24px;padding:56px 22px 22px;align-items:stretch}.poster-stage{order:0;aspect-ratio:16/9}.poster-stage>img{max-height:42dvh}.dialog-details{order:1}.dialog-details h2{font-size:26px;margin-bottom:8px}.dialog-age{font-size:14px}.dialog-intro{font-size:16px;line-height:1.65;margin-top:18px}.course-navigation{gap:24px;margin-top:15px}.dialog-close{right:12px;top:6px}}
@media print{.poster-dialog{display:none!important}}

/* 页头品牌采用Regular，主标题采用Bold，页头与页尾使用一致细线。 */
.brand,.footer-brand{font-weight:400;letter-spacing:.02em}
h1{font-weight:700}
.masthead{padding:33px 0 29px}
.header-edition,.footer-edition{display:flex;align-items:center;gap:18px;font-size:14px;font-weight:400;white-space:nowrap}
.header-edition>span+span,.footer-edition>span+span{border-left:1px solid var(--line);padding-left:18px}
.footer-edition{margin-left:auto}
@media(max-width:690px){.site-header{flex-wrap:wrap;gap:16px}.masthead{flex-wrap:wrap}.header-edition,.footer-edition{font-size:12px;gap:12px}.header-edition>span+span,.footer-edition>span+span{padding-left:12px}}
@media(max-width:440px){h1{font-size:clamp(26px,7.5vw,34px)}.footer-edition{width:100%;margin-left:0}}

/* 年龄选项直接展示；保留结果变化的辅助阅读通知。 */
.age-filter{display:flex;align-items:center;gap:14px;min-width:0}
.age-label{font-size:13px;color:var(--muted);flex-shrink:0}
.age-options{display:flex;align-items:center;gap:4px;flex-wrap:wrap;min-width:0}
.age-option{border:1px solid transparent;background:transparent;color:var(--muted);border-radius:4px;padding:10px 12px;min-height:44px;font-size:14px;line-height:1.5;white-space:nowrap}
.age-option:hover{background:var(--soft);color:var(--ink)}
.age-option.active{border-color:var(--line);background:var(--soft);color:var(--red)}
.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
@media(max-width:690px){.age-filter{gap:10px;width:100%}.age-label{font-size:12px}.age-option{padding:10px 8px;font-size:13px}.control-bottomline{padding:8px 0}.age-options{gap:3px}}

.age-filter{gap:0}