/* Teacher column: shares the existing warm ivory, orange and brown palette. */
.column-section{padding-top:0;padding-bottom:clamp(48px,5vw,80px)}
.column-feature-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px}
.column-feature{position:relative;display:flex;flex-direction:column;aspect-ratio:1/1;padding:24px;border-radius:16px;border:1px solid #e8ddcf;background:#fff;color:#2b1d12;text-decoration:none;transition:transform .2s,box-shadow .2s;overflow:hidden}
.column-feature:hover{transform:translateY(-4px);box-shadow:0 12px 32px #2b1d1212}
.column-feature:focus-visible,.column-more:focus-visible,.column-item:focus-visible{outline:3px solid #e9763c;outline-offset:4px}
.column-feature:nth-child(1){background:#2b1d12;color:#fff;border-color:#2b1d12}
.column-feature:nth-child(2){background:#f6e8d9}
.column-feature:nth-child(3){background:#eeeee5}
.column-feature:nth-child(4){background:#fff8f1}
.column-feature-top{display:flex;align-items:center;justify-content:space-between;gap:8px;color:#9a5a36;font-size:12px;letter-spacing:1px;font-weight:600}
.column-feature:first-child .column-feature-top{color:#f7bb92}
.column-feature-number{font-size:25px;line-height:1;font-weight:400;letter-spacing:-1px;opacity:.65}
.column-feature h3{font-size:clamp(16px,1.45vw,21px);line-height:1.55;margin:22px 0 16px;font-weight:700;overflow-wrap:anywhere}
.column-feature-bottom{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-top:auto;font-size:12px;color:#8c644a}
.column-feature:first-child .column-feature-bottom{color:#f4c7ab}
.column-feature-arrow{font-size:22px;line-height:1;transition:transform .2s}
.column-feature:hover .column-feature-arrow{transform:translateX(4px)}
.column-more-wrap{text-align:center;margin-top:28px}
.column-more{display:inline-flex;gap:22px;align-items:center;padding:10px 24px;border:1px solid #d98755;border-radius:999px;color:#b46637;background:transparent;text-decoration:none;font-size:14px;font-weight:600}
.column-more:hover{background:#fff0e3}
.column-page{margin:0;background:#faf7f2;color:#2b1d12;font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;line-height:1.7}
.column-page *{box-sizing:border-box}
.column-page a{color:inherit;text-decoration:none}
.column-page img{max-width:100%;height:auto;display:block}
.column-header{background:#2b1d12;color:#fff;border-bottom:1px solid #ffffff15}
.column-header-inner{max-width:1152px;margin:auto;padding:20px 26px;display:flex;align-items:center;justify-content:space-between;gap:22px}
.column-logo img{width:auto;height:35px;filter:brightness(0) invert(1)}
.column-header nav{display:flex;gap:26px;font-size:14px}
.column-header nav a:hover{color:#ffb181}
.column-page-main{max-width:1100px;margin:auto;padding:0 26px}
.column-intro{padding:64px 0 42px;border-bottom:1px solid #e8ddcf;margin-bottom:34px;display:flex;justify-content:space-between;gap:40px;align-items:center}
.column-eyebrow{color:#a06b48;letter-spacing:2px;font-size:12px;font-weight:700;margin:0 0 12px}
.column-intro h1{font-size:clamp(32px,4vw,48px);line-height:1.2;letter-spacing:2px;margin:0 0 18px}
.column-intro p{color:#7a6b5d;font-size:15px;margin:0;max-width:620px}
.column-author-portrait{height:108px!important;width:108px;object-fit:cover;object-position:80% 35%;border-radius:50%;border:5px solid #fff;box-shadow:0 8px 24px #2b1d1210}
.column-list-heading{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:22px;gap:20px}
.column-list-heading h2{font-size:21px;margin:0}
.column-list-heading span{font-size:13px;color:#947e6b}
.column-list{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;padding-bottom:64px}
.column-item{display:flex;flex-direction:column;padding:26px;background:#fff;border:1px solid #e8ddcf;border-radius:15px;transition:transform .2s,border-color .2s}
.column-item:hover{transform:translateY(-3px);border-color:#d98755}
.column-item-top{display:flex;justify-content:space-between;align-items:center;gap:10px;font-size:11px;color:#9b6746}
.column-status{font-size:10px;letter-spacing:0;color:#896b54;border:1px solid #e2d4c4;border-radius:5px;padding:1px 6px;white-space:nowrap}
.column-item h3{font-size:19px;line-height:1.6;margin:17px 0 14px;overflow-wrap:anywhere}
.column-item p{font-size:13px;line-height:1.9;color:#887767;margin:0 0 25px;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.column-item-bottom{font-size:12px;color:#af6b40;margin-top:auto;display:flex;justify-content:space-between;gap:10px}
.column-footer{border-top:1px solid #e8ddcf;padding:30px 26px;text-align:center;color:#8b7866;font-size:12px}
.column-footer a{margin:0 12px}
.column-breadcrumbs{font-size:12px;color:#9d8876;margin:30px 0;display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.column-breadcrumbs a:hover{color:#c16834}
.column-article{max-width:800px;margin:0 auto;padding-bottom:60px}
.column-article-header{padding:16px 0 28px;border-bottom:1px solid #e8ddcf}
.column-article-header h1{font-size:clamp(26px,3.2vw,38px);line-height:1.5;letter-spacing:.3px;margin:14px 0 20px;overflow-wrap:anywhere}
.column-byline{display:flex;gap:14px;flex-wrap:wrap;align-items:center;font-size:13px;color:#99806a}
.column-byline strong{color:#74533b;font-weight:500}
.column-abstract{font-size:15px;line-height:1.95;color:#7c624d;border-left:3px solid #d98755;padding:4px 0 4px 20px;margin:28px 0 34px}
.column-toc{border:1px solid #e8ddcf;border-radius:10px;background:#fffaf4;margin:28px 0;padding:14px 20px;font-size:13px}
.column-toc summary{cursor:pointer;color:#9b6746;font-weight:600}
.column-toc ol{margin:12px 0 4px;padding-left:22px}
.column-toc a{line-height:2.1;color:#856b53}
.column-toc a:hover{color:#c16834}
.column-article-body{color:#4b3a2a;font-size:17px;line-height:2;overflow-wrap:anywhere}
.column-article-body p{margin:0 0 1.25em}
.column-article-body h2{font-size:25px;line-height:1.6;color:#2b1d12;margin:2.1em 0 .9em;scroll-margin-top:24px}
.column-article-body h3{font-size:20px;line-height:1.7;color:#65432e;margin:1.6em 0 .7em}
.column-article-body h4{font-size:18px;line-height:1.7;margin:1.4em 0 .7em}
.column-article-body ul,.column-article-body ol{padding-left:1.5em;margin:1em 0 1.4em}
.column-article-body li{margin:.4em 0}
.column-article-body strong{font-weight:650;color:#3a2719}
.column-article-body a{color:#b5612f;text-decoration:underline;text-underline-offset:4px}
.column-article-body figure{margin:32px 0}
.column-article-body figure img{width:100%;height:auto;border-radius:9px;background:#eee5d9}
.column-caption{text-align:center;font-size:12px;color:#9c8570;line-height:1.9}
.column-article-body hr{border:0;border-top:1px solid #e8ddcf;margin:36px 0}
.column-article-body code{font-family:inherit;white-space:normal}
.column-related{border-top:1px solid #e8ddcf;margin-top:44px;padding-top:32px}
.column-related h2{font-size:20px;margin:0 0 22px}
.column-related-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.column-related-grid a{display:block;background:#fff;border:1px solid #e8ddcf;padding:18px;border-radius:10px;font-size:14px;line-height:1.8}
.column-related-grid a:hover{border-color:#d98755;color:#b5612f}
.column-return{display:inline-flex;gap:16px;align-items:center;margin-top:30px;color:#b46637!important;font-size:14px}
@media(min-width:701px) and (max-width:1050px){.column-feature-grid{grid-template-columns:repeat(2,minmax(0,1fr));max-width:740px;margin:auto}.column-feature{aspect-ratio:1.3/1}.column-feature h3{font-size:22px}.column-list{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:700px){.column-feature-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.column-feature{padding:17px;aspect-ratio:1/1.12;border-radius:12px}.column-feature h3{font-size:15px;line-height:1.55;margin:16px 0 12px}.column-feature-top{font-size:10px;letter-spacing:0}.column-feature-number{font-size:20px}.column-feature-bottom{font-size:10px}.column-feature-arrow{font-size:18px}.column-header-inner{padding:17px 20px}.column-logo img{height:29px}.column-header nav{gap:18px;font-size:12px}.column-page-main{padding:0 20px}.column-intro{padding:40px 0 30px;gap:18px}.column-intro h1{font-size:34px}.column-intro p{font-size:13px}.column-author-portrait{width:74px;height:74px!important;border-width:3px}.column-list{grid-template-columns:1fr;gap:14px;padding-bottom:40px}.column-item{padding:22px}.column-item h3{font-size:18px;margin:14px 0 10px}.column-item p{margin-bottom:16px}.column-article-header h1{font-size:25px}.column-article-body{font-size:16px;line-height:1.95}.column-article-body h2{font-size:22px}.column-related-grid{grid-template-columns:1fr}.column-abstract{font-size:14px;padding-left:15px}.column-breadcrumbs{margin:23px 0}.column-eyebrow{font-size:10px}.column-footer{padding:24px 14px}}
@media(max-width:360px){.column-feature-grid{grid-template-columns:1fr}.column-feature{padding:20px;aspect-ratio:1.5/1}.column-feature h3{font-size:18px;margin-top:14px}.column-feature-number{font-size:21px}.column-feature-bottom{font-size:12px}.column-author-portrait{display:none}#data .data-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(prefers-reduced-motion:reduce){.column-feature,.column-feature-arrow,.column-item{transition:none;transform:none!important}}
/* Published WeChat sources only */
.column-feature-unavailable{cursor:default}
.column-feature-unavailable:hover{transform:none;box-shadow:none}
.column-feature-unavailable:hover .column-feature-arrow{transform:none}
.column-hero-unavailable{cursor:default;opacity:.8}
.column-hero-unavailable:hover{transform:none;box-shadow:none}
.column-category-nav{display:flex;gap:10px;flex-wrap:wrap;margin:0 0 36px}
.column-category-nav a{border:1px solid #e8ddcf;border-radius:999px;padding:8px 20px;background:#fff;color:#8b6042;font-size:14px}
.column-category-nav a:hover{border-color:#d98755}
.column-category{scroll-margin-top:28px;margin:0 0 46px}
.column-category>h2{font-size:26px;margin:0 0 24px;padding-bottom:16px;border-bottom:1px solid #e8ddcf}
.column-format{margin:0 0 30px}
.column-format>h3{font-size:17px;color:#94653f;margin:0 0 18px}
.column-format .column-list{padding-bottom:0}
.column-format .column-item h4{font-size:19px;line-height:1.6;margin:17px 0 14px}
.column-empty{font-size:14px;color:#9b8776;background:#f4eee5;border-radius:12px;padding:25px}
.column-item-unavailable{cursor:default}
.column-item-unavailable:hover{transform:none;border-color:#e8ddcf}
.column-article-body .wechat-article-image{display:block;width:100%;height:auto;max-width:100%;border-radius:9px;margin:28px auto}
.column-article-body .column-caption{display:block;width:100%;text-align:center;font-size:13px;font-style:normal;color:#9c8570;line-height:1.9;margin:0 0 1.25em}
.column-article-body .column-caption em{font-style:inherit}
.column-author-note{margin-top:48px;padding:26px;border:1px solid #F05000;border-radius:10px;background:#fffaf5}
.column-author-note h3{margin-top:0}
.column-author-note p:last-child{margin-bottom:0}
.column-article-header h1{text-wrap:balance}
.column-web-edited{max-width:780px}
.column-web-edited .column-article-header{padding:8px 0 22px}
.column-web-edited .column-article-header h1{margin:8px 0 16px;line-height:1.45}
.column-web-edited .column-abstract{line-height:1.85;margin:24px 0 28px}
.column-web-edited .column-article-body{display:flow-root;line-height:1.85}
.column-web-edited .column-article-body>p{margin:0 0 16px}
.column-web-edited .column-article-body>h2{font-size:24px;line-height:1.5;margin:34px 0 14px}
.column-web-edited .column-article-body>h3{font-size:20px;line-height:1.5;margin:26px 0 12px}
.column-web-edited .column-article-body>h4{margin:22px 0 12px}
.column-web-edited .column-article-body>div>p{margin:0 0 16px}
.column-web-edited .column-article-body figure{margin:24px 0 22px}
.column-web-edited .column-article-body figure img.wechat-article-image{margin:0}
.column-web-edited .column-article-body figcaption.column-caption{margin:8px 0 0;line-height:1.65;font-size:13px}
.column-web-edited .column-article-body figcaption em{font-style:normal}
.column-web-edited .column-article-body hr{margin:26px 0}
.column-web-edited .column-article-body ul,.column-web-edited .column-article-body ol{margin:14px 0 18px}
.column-web-edited .column-author-note{margin-top:32px;padding:22px}
.column-web-edited .column-author-note p{font-size:14px;line-height:1.85;margin:0 0 12px}
.column-web-edited .column-author-note h3{margin:0 0 16px}
.column-web-edited .column-author-note p:last-child{margin-bottom:0}
.column-article-links{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;border-top:1px solid #e8ddcf;margin-top:28px;padding-top:20px}
.column-article-links .column-return{margin-top:0}
@media(max-width:700px){.column-category>h2{font-size:23px}.column-category-nav a{font-size:12px;padding:7px 16px}.column-format .column-item h4{font-size:18px}}
@media(max-width:700px){.column-web-edited .column-article-body>h2{font-size:22px;margin-top:28px}.column-web-edited .column-article-body>h3{font-size:19px}.column-web-edited .column-author-note{padding:18px}.column-web-edited .column-article-body figure{margin:22px 0 20px}.column-web-edited .column-abstract{margin-bottom:24px}}

/* Article related reading: authorized 2026-10-16 */
.column-related{margin:32px 0 26px;padding-top:24px;border-top:1px solid #e8ddcf}
.column-related h2{font-size:20px;line-height:1.5;margin:0 0 14px}
.column-related ul{list-style:none;margin:0;padding:0;display:grid;gap:12px}
.column-related li{margin:0;line-height:1.75}
.column-related a{color:#8b6042;text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:4px;overflow-wrap:anywhere}
.column-related a:hover,.column-related a:focus-visible{color:#F05000}
.column-related-unavailable{color:#9b8776;overflow-wrap:anywhere}
.column-related-status{font-size:12px;white-space:nowrap;margin-left:6px}
@media(max-width:700px){.column-related{margin-top:26px;padding-top:20px}.column-related h2{font-size:19px}.column-related a{font-size:15px}}

/* Website inline article references: 2026-10-16 */
.column-article-body a.column-inline-article-link{color:#8b6042;text-decoration:underline;text-underline-offset:4px;text-decoration-thickness:1px}
.column-article-body a.column-inline-article-link:hover,.column-article-body a.column-inline-article-link:focus-visible{color:#F05000}