/* One shared stylesheet. Pages are plain HTML and need no build step. */
:root{--paper:#f7f9fc;--white:#fff;--blue:#3059d6;--blue-dark:#2345ae;--ink:#25344a;--muted:#657086;--line:#e2e7ef;--yellow:#f3ce58;--blue-wash:#eaf0ff;--green-wash:#eaf2ee;--green:#406958;--radius:20px;--body:"PingFang SC","Microsoft YaHei","Noto Sans CJK SC",sans-serif;--heading:"Source Han Sans SC","PingFang SC","Microsoft YaHei",sans-serif}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{min-height:100svh;display:flex;flex-direction:column;margin:0;color:var(--ink);background:var(--white);font:16px/1.8 var(--body);-webkit-font-smoothing:antialiased}body>main{flex:1}.collection-page{background:var(--paper)}.about-page{display:grid;align-content:center}body.dialog-open{overflow:hidden}h1,h2,h3,p,figure,blockquote{margin:0}h1,h2,h3{font-family:var(--heading);font-weight:650;line-height:1.4;letter-spacing:-.04em}a{color:inherit;text-decoration:none}button,input{font:inherit}button{cursor:pointer}button,a,input{-webkit-tap-highlight-color:transparent}button:disabled{cursor:default;opacity:.4}a,button,input{touch-action:manipulation}a:focus-visible,button:focus-visible,input:focus-visible{outline:3px solid var(--blue);outline-offset:5px}img{display:block;max-width:100%;height:auto}svg{flex-shrink:0}button svg,a svg{width:20px;height:20px;vertical-align:middle}::selection{background:#fae5a0;color:var(--ink)}[hidden]{display:none!important}.wrap{width:min(1160px,calc(100% - 96px));margin-inline:auto}.skip-link{position:fixed;z-index:50;left:16px;top:-70px;padding:10px 18px;background:var(--blue);color:white;border-radius:8px}.skip-link:focus{top:12px}.site-header{height:94px;background:rgba(255,255,255,.97);border-bottom:1px solid rgba(226,231,239,.65);position:relative;z-index:5}.nav{height:100%;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{display:flex;align-items:center;gap:12px;flex-shrink:0}.brand img{width:43px;height:43px}.brand-name{font-size:24px;font-weight:750;letter-spacing:.035em;line-height:1.2}.brand-sub{display:block;font-size:10px;letter-spacing:.13em;color:var(--muted);margin-top:4px;line-height:1.3}.nav-links{display:flex;align-items:center;gap:32px;font-size:14px}.nav-link{padding:8px 0;position:relative;color:var(--muted)}.nav-link:hover,.nav-link[aria-current="page"]{color:var(--blue)}.nav-link[aria-current="page"]:after{position:absolute;content:"";height:3px;width:16px;background:var(--blue);bottom:0;left:calc(50% - 8px);border-radius:8px}.nav-cta{font-size:13px;font-weight:600;padding:9px 17px;border:1px solid var(--line);border-radius:8px;display:flex;align-items:center;gap:9px}.nav-cta:hover{border-color:var(--blue);color:var(--blue)}.nav-cta svg{width:16px;height:16px}.eyebrow{font-size:11px;letter-spacing:.15em;text-transform:uppercase;color:var(--blue);font-weight:650;display:flex;align-items:center;gap:9px}.eyebrow:before{content:"";display:block;width:7px;height:7px;border-radius:50%;background:var(--yellow)}.hero{padding:72px 0 76px;display:grid;grid-template-columns:.94fr 1.06fr;gap:55px;align-items:center}.hero h1{font-size:clamp(40px,4.35vw,61px);line-height:1.42;letter-spacing:-.055em;margin:22px 0 23px;font-weight:750}.hero h1 span{color:var(--blue);position:relative;white-space:nowrap}.hero h1 span:after{content:"";position:absolute;bottom:-5px;left:1%;width:98%;height:8px;background:var(--yellow);border-radius:50%;transform:rotate(-1.7deg);z-index:-1}.hero-description{max-width:400px;font-size:15px;line-height:2.1;color:var(--muted)}.hero-actions{display:flex;gap:21px;align-items:center;margin-top:30px}.button{display:inline-flex;align-items:center;justify-content:center;gap:16px;border:1px solid transparent;background:var(--blue);color:white;border-radius:9px;font-size:14px;font-weight:600;padding:12px 23px;line-height:1.7;transition:background .18s,transform .18s}.button:hover{background:var(--blue-dark);transform:translateY(-2px)}.button-light{background:white;border-color:var(--line);color:var(--ink)}.button-light:hover{background:var(--paper)}.text-link{font-size:13px;display:inline-flex;align-items:center;gap:8px;color:var(--muted)}.text-link:hover{color:var(--blue)}.text-link svg{width:17px;height:17px}.hero-footnote{margin-top:31px;display:flex;gap:12px;align-items:center;font-size:11px;color:var(--muted)}.tiny-book{display:flex;gap:3px}.tiny-book i{height:14px;width:4px;display:block;background:var(--blue);border-radius:1px;transform:rotate(-12deg)}.tiny-book i:nth-child(2){background:var(--yellow);transform:none}.tiny-book i:nth-child(3){background:#a4b8e9;transform:rotate(12deg)}.hero-art{position:relative;padding:12px 0 35px}.hero-frame{padding:10px 10px 0;border:1px solid #e8eaf0;background:#fff;box-shadow:0 12px 36px #25344a0a;transform:rotate(2deg);border-radius:5px}.hero-frame img{width:100%;height:342px;object-fit:cover;border-radius:2px}.hero-frame figcaption{display:flex;align-items:center;justify-content:space-between;font-size:10px;color:var(--muted);padding:12px 7px;letter-spacing:.045em}.hero-tape{position:absolute;width:98px;height:28px;top:0;left:42%;background:#dfe8febd;z-index:1;transform:rotate(-5deg);border:1px solid #d1dff799}.discovery-note{position:absolute;bottom:4px;left:-29px;transform:rotate(-5deg);padding:19px 27px;background:#f7dc7e;box-shadow:2px 5px 14px #634b1910;font-size:16px;line-height:1.65;min-width:201px;color:#50472e}.discovery-note small{display:block;font-size:10px;letter-spacing:.12em;margin-bottom:6px}.note-star{position:absolute;right:15px;top:15px;font-size:22px;font-weight:400;color:#8a712b}.hero-doodle{position:absolute;right:-14px;top:-10px;color:var(--blue);width:46px;height:46px;transform:rotate(12deg)}.intro-strip{border-top:1px solid var(--line);padding:22px 0;display:flex;justify-content:space-between;gap:18px;align-items:center;font-size:12px;color:var(--muted)}.intro-strip strong{font-size:13px;font-weight:500;color:var(--ink)}.intro-strip .dot{width:4px;height:4px;background:#bfc8d9;border-radius:50%}.intro-items{display:flex;gap:27px;align-items:center}.collection-section{padding:73px 0 78px;background:var(--paper)}.section-heading{display:flex;justify-content:space-between;align-items:flex-end;gap:24px}.section-heading :is(h1,h2){font-size:35px;margin-top:12px;font-weight:700}.section-heading p{font-size:13px;color:var(--muted);margin-bottom:3px}.section-heading .pencil-line{border-bottom:3px solid #b5c7f4;padding-bottom:2px}.collection-tools{display:flex;align-items:center;justify-content:space-between;gap:20px;margin:31px 0 29px}.filters{display:flex;flex-wrap:wrap;gap:8px}.filter{font-size:12px;background:transparent;border:1px solid transparent;border-radius:7px;padding:8px 14px;color:var(--muted);white-space:nowrap}.filter:hover{color:var(--blue);background:var(--blue-wash)}.filter[aria-pressed="true"]{color:white;background:var(--blue);border-color:var(--blue)}.search-field{position:relative;flex:0 1 216px;min-width:170px}.search-field svg{position:absolute;left:12px;top:12px;width:17px;height:17px;color:var(--muted);pointer-events:none}.search-field input{padding:9px 13px 9px 37px;font-size:12px;color:var(--ink);border:1px solid var(--line);border-radius:7px;background:white;width:100%;line-height:1.8;min-height:40px}.search-field input::placeholder{color:#808b9d}.result-count{font-size:11px;color:var(--muted);margin-bottom:16px;letter-spacing:.02em}.course-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}.course-card{background:white;border:1px solid var(--line);border-radius:13px;overflow:hidden;transition:box-shadow .22s,transform .22s;display:flex;flex-direction:column}.course-card:hover{transform:translateY(-5px);box-shadow:0 12px 30px #25344a0a}.course-cover{position:relative;overflow:hidden;background:var(--blue-wash)}.course-cover img{width:100%;aspect-ratio:1.52;object-fit:cover;transition:transform .5s}.course-card:hover .course-cover img{transform:scale(1.035)}.sample-tag{font-size:10px;border:1px solid #fff9;background:#fffdf3e8;padding:3px 9px;border-radius:4px;position:absolute;left:14px;top:14px;color:#5f615c;letter-spacing:.06em}.cover-open{position:absolute;right:14px;bottom:14px;width:30px;height:30px;display:grid;place-items:center;background:#fffffff0;border-radius:50%;color:var(--blue)}.cover-open svg{width:15px;height:15px}.course-copy{padding:23px 22px 19px;display:flex;flex-direction:column;flex:1}.course-meta{display:flex;align-items:center;justify-content:space-between;font-size:10px;color:var(--muted)}.topic{color:var(--blue);background:var(--blue-wash);padding:2px 8px;border-radius:4px;font-size:10px;line-height:1.8;display:inline-block}.topic.yellow{color:#786321;background:#fbf1cf}.topic.green{color:var(--green);background:var(--green-wash)}.course-card h3{font-size:21px;letter-spacing:-.045em;line-height:1.55;margin:15px 0 12px}.course-card p{font-size:12px;line-height:1.95;color:var(--muted);margin-bottom:23px}.course-bottom{display:flex;justify-content:space-between;align-items:center;border-top:1px solid var(--line);padding-top:14px;margin-top:auto;font-size:11px;color:var(--muted)}.course-bottom span:last-child{color:var(--blue)}.course-bottom svg{width:13px;height:13px;margin-left:5px}.empty-state{text-align:center;padding:52px 20px 35px}.empty-state h3{font-size:20px}.empty-state p{font-size:14px;color:var(--muted);margin:10px 0 18px}.collection-note{text-align:center;font-size:11px;color:var(--muted);margin-top:28px;display:flex;gap:8px;align-items:center;justify-content:center}.collection-note svg{width:14px;height:14px}.about-section{padding:85px 0 90px;display:grid;grid-template-columns:1fr 1fr;gap:90px;align-items:center}.about-copy :is(h1,h2){font-size:39px;line-height:1.5;margin:17px 0 23px}.about-copy p{font-size:14px;line-height:2;color:var(--muted);max-width:410px}.about-principles{display:flex;gap:19px;margin-top:25px;flex-wrap:wrap}.about-principles span{font-size:11px;color:var(--blue);display:flex;align-items:center;gap:6px}.about-principles span:before{content:"";width:4px;height:4px;background:var(--blue);border-radius:50%}.field-note{position:relative;background:#faf3d8;border-radius:3px;padding:40px 42px 34px;transform:rotate(-2deg);box-shadow:3px 6px 0 #f2f0e8;background-image:repeating-linear-gradient(transparent 0,transparent 37px,#ccb8612b 37px,#ccb8612b 38px);background-position:0 9px}.field-note:before{content:"";position:absolute;left:27px;right:27px;top:0;border-top:3px solid #f3ce58}.field-note-label{font-size:10px;color:#8b7a46;letter-spacing:.14em;display:flex;justify-content:space-between}.field-note h3{font-size:27px;line-height:1.5;margin:25px 0 16px;color:#4b442c}.field-note p{font-size:13px;color:#786c4c;line-height:1.95;max-width:310px}.field-note-bottom{display:flex;justify-content:space-between;align-items:center;font-size:11px;color:#8b7a46;margin-top:23px}.note-flower{width:50px;height:50px;color:#99853f}.closing{border-top:1px solid var(--line);padding:25px 0;display:flex;justify-content:space-between;align-items:center;gap:20px;font-size:13px}.closing p{color:var(--muted)}.closing a{color:var(--blue);font-size:13px}.site-footer{background:var(--paper);border-top:1px solid var(--line);padding:30px 0}.footer-inner{display:flex;align-items:center;justify-content:space-between;gap:25px}.footer-brand{display:flex;align-items:center;gap:10px;font-size:14px;font-weight:650}.footer-brand img{width:27px;height:27px}.footer-note{font-size:10px;color:var(--muted);text-align:right;line-height:1.9}.footer-note a:hover{color:var(--blue)}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
/* Course stories */
.breadcrumb{display:flex;gap:9px;align-items:center;flex-wrap:wrap;font-size:11px;color:var(--muted);padding:30px 0}.breadcrumb a:hover{color:var(--blue)}.breadcrumb span:last-child{color:var(--ink)}.story-heading{display:grid;grid-template-columns:1fr 290px;gap:65px;align-items:end;padding:20px 0 37px}.story-heading h1{font-size:48px;line-height:1.5;margin:19px 0 20px;font-weight:750;letter-spacing:-.045em}.story-heading .lead{font-size:15px;color:var(--muted);line-height:2;max-width:660px}.story-meta{display:flex;gap:12px;align-items:center;font-size:11px;color:var(--muted)}.story-heading-aside{padding-bottom:5px}.story-heading-aside>p{font-size:11px;color:var(--muted);line-height:1.9;padding:15px 0 0}.sample-notice{font-size:12px;color:#796533;background:#fbf7e9;border:1px solid #efe7c9;border-radius:8px;padding:12px 18px;margin-bottom:25px;display:flex;align-items:flex-start;gap:10px}.sample-notice svg{margin-top:4px;width:15px;height:15px;flex-shrink:0}.story-cover{position:relative}.story-cover>img{width:100%;aspect-ratio:2.05;object-fit:cover;border-radius:14px}.story-cover figcaption{font-size:11px;color:var(--muted);padding:12px 1px;text-align:right}.story-body{display:grid;grid-template-columns:200px minmax(0,750px);gap:75px;padding:47px 0 54px;justify-content:space-between}.story-toc{align-self:start;position:sticky;top:34px;border-left:1px solid var(--line);padding:0 0 0 21px;font-size:12px}.story-toc p{font-size:10px;letter-spacing:.12em;color:var(--muted);margin-bottom:17px}.story-toc a{display:block;padding:7px 0;color:var(--muted)}.story-toc a:hover{color:var(--blue)}.story-toc .back-collection{border-top:1px solid var(--line);margin-top:18px;padding-top:17px;color:var(--blue);font-size:11px}.story-section{margin-bottom:57px;scroll-margin-top:35px}.story-section h2{font-size:28px;margin-bottom:24px;display:flex;align-items:center;gap:11px}.chapter-no{color:#a5b5d5;font-size:12px;font-family:ui-monospace,SFMono-Regular,monospace;letter-spacing:0;font-weight:500;align-self:center}.story-section>p{font-size:14px;line-height:2.15;color:var(--muted);margin-bottom:16px}.question-box{padding:29px 31px;border-radius:12px;background:var(--blue-wash);border-left:3px solid var(--blue)}.question-box small{font-size:10px;letter-spacing:.1em;color:var(--blue)}.question-box p{font-size:23px;line-height:1.65;margin-top:10px;letter-spacing:-.02em}.lesson-step{display:grid;grid-template-columns:37px 1fr;gap:18px;margin-top:27px}.step-number{display:grid;place-items:center;align-self:start;color:var(--blue);font-size:12px;border:1px solid #cbd7f0;background:var(--white);height:33px;border-radius:50%;font-family:ui-monospace,monospace}.lesson-step h3{font-size:18px;margin-bottom:8px}.lesson-step p{font-size:14px;line-height:2;color:var(--muted)}.gallery{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:17px;margin-top:20px}.gallery-item{min-width:0}.gallery-item:first-child{grid-column:1/-1}.gallery-open{padding:0;border:0;display:block;position:relative;width:100%;background:var(--paper);border-radius:10px;overflow:hidden}.gallery-open img{width:100%;aspect-ratio:1.65;object-fit:cover;transition:transform .35s}.gallery-item:first-child .gallery-open img{aspect-ratio:2.1}.gallery-open:hover img{transform:scale(1.025)}.gallery-zoom{position:absolute;right:13px;bottom:13px;display:flex;gap:5px;align-items:center;padding:4px 9px;background:#ffffffed;border-radius:5px;font-size:10px;color:var(--ink)}.gallery-zoom svg{width:14px;height:14px}.gallery-item figcaption{font-size:11px;color:var(--muted);padding-top:8px}.reflection{background:#fbf5df;padding:29px 32px 26px;border-radius:10px;position:relative}.reflection .quote-mark{font-family:Georgia,serif;font-size:63px;line-height:.9;color:#d3b953}.reflection blockquote{font-size:23px;line-height:1.8;color:#5e5338;margin:2px 0 15px}.reflection figcaption{font-size:11px;color:#8a7c59}.teacher-note{margin-top:23px;padding-left:22px;border-left:2px solid #dfe6f1}.teacher-note strong{font-size:12px;font-weight:600}.teacher-note p{font-size:14px;color:var(--muted);line-height:2;margin-top:6px}.take-home{background:var(--paper);padding:28px 29px;border-radius:11px}.take-home .topic{margin-bottom:15px}.take-home h3{font-size:21px;margin-bottom:12px}.take-home p{font-size:14px;color:var(--muted);line-height:2}.story-share{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:25px 0;display:flex;justify-content:space-between;align-items:center;gap:20px}.story-share h3{font-size:17px}.story-share p{font-size:12px;color:var(--muted);margin-top:3px}.story-navigation{display:flex;justify-content:space-between;gap:30px;padding-top:33px}.story-navigation a{max-width:47%}.story-navigation a:last-child{text-align:right;margin-left:auto}.story-navigation small{display:block;font-size:10px;letter-spacing:.08em;color:var(--muted);margin-bottom:8px}.story-navigation strong{font-size:14px;font-weight:500;color:var(--blue)}
/* Native image viewer and link-copy fallback. */
.lightbox{border:0;padding:0;background:#162033;color:white;max-width:calc(100vw - 40px);width:1100px;max-height:calc(100dvh - 36px);border-radius:13px;overflow:hidden}.lightbox::backdrop,.share-dialog::backdrop{background:#152038db;backdrop-filter:blur(5px)}.lightbox-top{display:flex;align-items:center;justify-content:space-between;padding:14px 20px;font-size:12px}.icon-button{background:transparent;color:inherit;border:1px solid #ffffff3b;width:38px;height:38px;border-radius:50%;display:grid;place-items:center;padding:0}.icon-button:hover{background:#ffffff1a}.lightbox img{width:100%;max-height:calc(100dvh - 205px);object-fit:contain;min-height:100px}.lightbox-bottom{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:15px 20px;font-size:12px}.lightbox-actions{display:flex;gap:10px;flex-shrink:0}.share-dialog{border:1px solid var(--line);width:440px;max-width:calc(100vw - 32px);padding:27px;border-radius:14px;color:var(--ink)}.share-dialog h2{font-size:20px;margin-bottom:10px}.share-dialog p{font-size:13px;color:var(--muted)}.share-dialog input{width:100%;font-size:12px;color:var(--ink);border:1px solid var(--line);padding:10px;border-radius:6px;margin:17px 0}.share-dialog .button{width:100%}.toast{position:fixed;bottom:27px;left:50%;transform:translateX(-50%);background:var(--ink);color:white;font-size:13px;padding:11px 23px;z-index:30;box-shadow:0 4px 18px #25344a20;border-radius:8px;max-width:calc(100vw - 30px);text-align:center}.not-found{min-height:65vh;display:grid;align-content:center;justify-items:center;text-align:center;gap:18px;padding-block:60px}.not-found h1{font-size:45px}.not-found p{color:var(--muted);font-size:14px}.not-found .page-number{font-size:13px;color:var(--blue);letter-spacing:.3em}
@media(min-width:1600px){.hero{padding-block:87px 91px}.hero-frame img{height:368px}}
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