:root{--ink:#193d3c;--muted:#536560;--paper:#fbfaf5;--line:#d9dfd4;--accent:#a6462d;--mint:#e6eee1;--peach:#f2dfcd;--serif:Georgia,'Times New Roman',serif;--sans:Arial,Helvetica,sans-serif}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:25px}body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);font-size:17px;line-height:1.65}a{color:inherit;text-underline-offset:4px}a:hover{color:var(--accent)}button,input{font:inherit}button,a,input,summary{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible,[tabindex]:focus-visible{outline:3px solid var(--accent);outline-offset:5px}h1,h2,h3,p{margin-top:0}h1,h2{font-family:var(--serif);font-weight:400;line-height:1.12;letter-spacing:-.035em}h3{line-height:1.3}p{margin-bottom:1.25em}img{max-width:100%}[hidden]{display:none!important}.shell{max-width:1240px;margin:auto;padding-inline:48px}.skip{position:absolute;top:-80px;left:20px;padding:12px;background:var(--ink);color:white;z-index:5}.skip:focus{top:10px}.site-head{border-bottom:1px solid var(--line)}.head-inner{min-height:100px;display:flex;align-items:center;justify-content:space-between;gap:28px}.brand{display:flex;align-items:center;gap:14px;text-decoration:none;font-weight:700;font-size:19px;line-height:1.25}.brand-mark{font-family:var(--serif);font-size:40px;font-style:italic;background:var(--ink);color:var(--paper);width:53px;height:53px;display:grid;place-items:center;border-radius:50%}.brand-sub{display:block;font-size:11px;text-transform:uppercase;letter-spacing:.13em;font-weight:400;margin-top:6px}.site-head nav{display:flex;gap:28px;align-items:center;font-size:14px}.site-head nav a{text-decoration:none}.nav-role{border-bottom:1px solid var(--ink);padding-block:6px}.eyebrow{text-transform:uppercase;letter-spacing:.13em;font-size:11px;font-weight:700;color:var(--accent);margin-bottom:20px}.library-hero{padding:68px 0 58px;background:linear-gradient(115deg,#fbfaf5 55%,#f0f2e8)}.hero-layout{display:grid;grid-template-columns:1.55fr 1fr;gap:80px;align-items:center}.library-hero h1{font-size:clamp(46px,5.5vw,74px);margin-bottom:24px}.library-hero h1 em{color:var(--accent);font-weight:400}.hero-intro{max-width:38ch;font-size:19px;line-height:1.6;color:var(--muted);margin-bottom:26px}.text-link{font-weight:700;font-size:14px}.start-note{background:var(--mint);padding:32px 32px 20px;border-top:4px solid var(--ink);transform:rotate(1deg)}.note-label{display:block;font-size:11px;text-transform:uppercase;letter-spacing:.13em;margin-bottom:28px}.start-note h2{font-size:35px;margin-bottom:20px}.start-note p{font-size:15px;color:var(--muted);max-width:28ch}.start-note a{font-size:14px;font-weight:700}.note-bottom{display:flex;justify-content:space-between;border-top:1px solid #bdcbbc;margin-top:35px;padding-top:16px;font-size:12px}.quick-paths{display:grid;grid-template-columns:repeat(3,1fr);padding-top:28px;padding-bottom:35px;gap:28px;border-bottom:1px solid var(--line)}.quick-paths a{text-decoration:none;border-left:2px solid #b8c8b5;padding-left:18px}.quick-paths span{display:block;font-size:11px;text-transform:uppercase;letter-spacing:.09em;color:var(--muted);margin-bottom:5px}.quick-paths strong{font-size:15px;line-height:1.4;display:block}.library{padding-block:68px}.library-heading{display:flex;align-items:end;justify-content:space-between;gap:30px;margin-bottom:30px}.library-heading h2{font-size:40px;margin-bottom:0}.library-heading p:last-child{font-size:13px;color:var(--muted);margin-bottom:4px}.search-label{display:block;font-size:13px;margin-bottom:8px}.search-box{display:flex;border:1px solid #81998e;background:white;max-width:720px}.search-box input{border:0;min-width:0;flex:1;background:transparent;padding:16px;font-size:16px;color:var(--ink)}.search-box button{background:transparent;border:0;border-left:1px solid var(--line);padding:10px 18px;color:var(--ink);font-size:13px}.filters{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px;margin-bottom:42px}.filters button{border:1px solid #bdc9bd;border-radius:3px;background:transparent;padding:8px 13px;font-size:13px;color:var(--ink)}.filters button[aria-pressed=true]{background:var(--ink);border-color:var(--ink);color:white}.guide-group{margin-bottom:52px}.group-heading{display:flex;align-items:center;justify-content:space-between;border-bottom:2px solid var(--ink);padding-bottom:16px;gap:20px}.group-heading h2{font-size:30px;margin:0}.group-heading span{font-size:12px;color:var(--muted)}.guide-list{list-style:none;margin:0;padding:0}.guide-item{border-bottom:1px solid var(--line)}.guide-item>a{display:grid;grid-template-columns:44px 1fr 32px;gap:24px;padding:25px 10px;text-decoration:none;align-items:start}.guide-item>a:hover{background:#f0f2e8;color:var(--ink)}.row-number{font-family:var(--serif);font-size:20px;color:#728374}.guide-item h3{font-size:20px;font-weight:500;margin:0 0 7px}.guide-item 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h1{font-size:clamp(36px,4.7vw,60px);max-width:23ch;margin-bottom:28px}.article-meta{display:flex;flex-wrap:wrap;gap:8px 24px;font-size:12px;color:var(--muted)}.reading-layout{display:grid;grid-template-columns:250px minmax(0,740px);gap:65px;padding-block:45px 75px;align-items:start}.on-page{position:sticky;top:24px;font-size:13px}.on-page summary{font-size:11px;letter-spacing:.1em;text-transform:uppercase;font-weight:700;cursor:pointer}.on-page ol{padding:0;list-style:none;margin:18px 0 26px}.on-page li{margin-bottom:13px}.on-page a{text-decoration:none;color:var(--muted)}.on-page a:hover{color:var(--accent)}.back-link{font-size:12px;border-top:1px solid var(--line);padding-top:18px;display:block}.article-body{min-width:0;font-size:17px;line-height:1.8}.article-body>p:first-child{font-size:21px;line-height:1.65;color:var(--ink)}.article-body h2{font-size:32px;margin:48px 0 20px;scroll-margin-top:25px}.article-body h3{font-size:22px;margin:26px 0 16px}.article-body li{margin-bottom:9px}.article-body a{color:#855034}.article-body strong{font-weight:700}.table-scroll{overflow-x:auto;border:1px solid var(--line);margin:28px 0;max-width:100%}table{border-collapse:collapse;width:100%;font-size:14px;line-height:1.55;min-width:420px}th,td{padding:14px 16px;text-align:left;vertical-align:top;border-bottom:1px solid var(--line)}th{background:var(--mint);font-weight:700}tr:last-child td{border-bottom:0}td:first-child{font-weight:600}tbody tr:nth-child(even){background:#f5f5ee}.article-end{border-top:2px solid var(--ink);padding-top:28px;margin-top:55px}.article-end h2{margin:8px 0 20px}.article-end ul{list-style:none;padding:0}.article-end li{padding:12px 0;border-bottom:1px solid var(--line);font-size:16px}.budget-tool{background:var(--mint);padding:28px;margin:30px 0;border-top:3px solid var(--ink)}.budget-tool h3{margin-top:0}.budget-tool>p{font-size:14px}.budget-inputs{display:grid;grid-template-columns:1fr 1fr;gap:18px}.budget-inputs label{font-size:13px;display:block}.budget-inputs input{display:block;width:100%;background:var(--paper);border:1px solid #80988b;color:var(--ink);padding:9px 12px;margin-top:6px}.budget-result{padding-top:25px;margin-top:25px;border-top:1px solid #b0c0b0}.budget-result span{display:block;font-size:13px}.budget-result output{font-family:var(--serif);font-size:40px;display:block}.budget-tool button{background:transparent;border:1px solid var(--ink);padding:8px 15px;color:var(--ink);font-size:13px}.form-error{font-size:13px;color:#922e1c;min-height:1em;margin:0}
@media(max-width:960px){.shell{padding-inline:30px}.hero-layout{gap:35px;grid-template-columns:1.4fr 1fr}.library-hero h1{font-size:54px}.reading-layout{grid-template-columns:200px minmax(0,1fr);gap:35px}.quick-paths{gap:15px}.start-note{padding:25px}.start-note h2{font-size:30px}}
@media(max-width:700px){body{font-size:16px}.shell{padding-inline:22px}.head-inner{flex-wrap:wrap;padding-block:20px;gap:20px;min-height:auto}.brand{font-size:17px}.brand-mark{width:43px;height:43px;font-size:33px}.site-head nav{width:100%;justify-content:space-between;gap:12px;font-size:13px}.hero-layout{grid-template-columns:1fr;gap:35px}.library-hero{padding:38px 0}.library-hero h1{font-size:47px}.hero-intro{font-size:17px}.start-note{transform:none}.start-note h2 br{display:none}.start-note p{max-width:none}.note-label{margin-bottom:15px}.note-bottom{margin-top:22px}.quick-paths{grid-template-columns:1fr;gap:22px;padding-block:28px}.library{padding-block:40px}.library-heading{display:block}.library-heading h2{font-size:34px;margin-bottom:15px}.search-box input{padding:13px 10px}.search-box button{padding-inline:10px}.filters{margin-bottom:30px}.filters button{font-size:12px;padding:8px 10px}.guide-item>a{grid-template-columns:24px 1fr 18px;gap:12px;padding:20px 0}.guide-item h3{font-size:18px}.guide-item p{font-size:13px}.row-number{font-size:17px}.row-arrow{font-size:20px}.group-heading h2{font-size:27px}.closing-note{grid-template-columns:1fr;gap:10px;padding-block:30px 45px}.closing-note h2{font-size:30px}.footer-inner{grid-template-columns:1fr}.article-head{padding-block:25px 30px}.article-head h1{font-size:39px}.article-meta{font-size:11px;gap:6px 15px}.reading-layout{display:flex;flex-direction:column;gap:26px;padding-top:25px}.on-page{position:static;width:100%;background:var(--mint);padding:18px 20px}.on-page ol{columns:1;margin-bottom:8px}.on-page li{margin-bottom:10px}.back-link{display:none}.article-body{font-size:16px}.article-body>p:first-child{font-size:19px}.article-body h2{font-size:28px;margin-top:36px}.budget-tool{padding:20px}.budget-inputs{grid-template-columns:1fr}.budget-result output{font-size:34px}.fine{grid-column:auto}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
@media print{.site-head,.site-foot,.on-page,.article-end,.breadcrumb{display:none}.reading-layout{display:block}.shell{padding:0}.article-head h1{font-size:32px}.article-body{font-size:11pt}.table-scroll{overflow:visible}body{background:white;color:black}}

/* Reused editorial illustrations from the AI adoption project. */
.index-art{margin:-32px -32px 24px}.index-art img{display:block;width:100%;height:auto}.index-art figcaption{font-size:10px;color:var(--muted);padding:7px 12px;background:#eef2e7}.article-art{margin:28px 0 34px}.article-art img{display:block;width:100%;height:auto;border-radius:3px}.article-art figcaption,.teacher-art figcaption{font-size:11px;line-height:1.5;color:var(--muted);margin-top:8px}.teacher-art{margin:26px 0 0;padding-top:20px;border-top:1px solid var(--line)}.teacher-art img{display:block;width:180px;max-width:100%;height:auto;mix-blend-mode:multiply}.start-note{transform:none}
@media(max-width:960px){.index-art{margin:-25px -25px 22px}}
@media(max-width:700px){.index-art{margin:-25px -25px 20px}.teacher-art{display:none}.article-art{margin-block:24px}}

.article-art.art-square{max-width:520px;margin-inline:auto}


/* Integrate with the approved Flying English site. */
@font-face{font-family:'DM Sans';src:url('../css/fonts/dm-sans-regular.ttf') format('truetype');font-weight:400;font-display:swap}
@font-face{font-family:'DM Sans';src:url('../css/fonts/dm-sans-bold.ttf') format('truetype');font-weight:700;font-display:swap}
:root{--ink:#173d49;--muted:#4c6269;--paper:#f7faf9;--line:#cddbd6;--accent:#176b60;--mint:#e5f3ee;--peach:#e5edf9;--serif:'DM Sans',sans-serif;--sans:'DM Sans',sans-serif}
h1,h2{font-weight:700}.site-head,.library-hero{background:var(--mint)}.site-head{border:0}.brand-logo{width:48px;height:auto}.brand-sub{letter-spacing:.06em;font-size:10px}.nav-role{border:0;border-radius:999px;background:#f3d45a;padding:12px 20px;font-weight:700}.library-hero{padding-block:55px 35px}.library-hero h1 em{font-style:normal;font-weight:700}.start-note{border:0;border-radius:28px 60px 28px 28px;overflow:hidden;background:#f7faf9}.guide-wave{display:block;width:100%;height:65px;background:var(--mint);fill:var(--paper)}.filters button{border-radius:999px}.search-box{border-radius:14px;overflow:hidden}.site-foot{background:#173d49;color:#dfebe9}.site-foot a:hover{color:white}.article-head{background:var(--mint);border-radius:25px 65px 25px 25px;padding:35px;margin-bottom:20px}.article-art img{border-radius:24px}.budget-tool{border-radius:24px}.reading-layout{grid-template-columns:220px minmax(0,1fr)}
@media(max-width:960px){.site-head nav{gap:15px}.hero-layout{gap:35px}}
@media(max-width:700px){.site-head nav{flex-wrap:wrap;justify-content:flex-start;gap:12px 20px}.guide-wave{height:40px}.article-head{padding:24px 20px}.article-head h1{font-size:32px}.library-hero h1{font-size:43px}.reading-layout{display:flex}.head-inner{gap:18px}}

@media(max-width:700px){.reading-layout>.article-body{width:100%;min-width:0}.reading-layout{width:100%}}