/* Editorial tutorial: DESIGN_VARIANCE 6, MOTION_INTENSITY 3, VISUAL_DENSITY 3.
   Native CSS; near-white paper, graphite, and a single lime accent. */
:root{color-scheme:light;--paper:#f8f8f5;--ink:#22241f;--muted:#696c64;--line:#dedfd8;--accent:#d6ef68;--panel:#eef0e9;--white:#fff;--radius:3px;font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:36px}body{margin:0}a{color:inherit;text-decoration:none}button{font:inherit;color:inherit;cursor:pointer}a,button{-webkit-tap-highlight-color:transparent}button,a{touch-action:manipulation}button:focus-visible,a:focus-visible{outline:3px solid #738f12;outline-offset:5px}button{border:0}h1,h2,h3,p,figure{margin:0}button:active{transform:translateY(1px)}.shell{width:min(1360px,calc(100% - 112px));margin-inline:auto}.header{height:100px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);height:80px}.brand{display:flex;align-items:center;gap:11px}.brand-symbol{font-size:34px;line-height:1;transform:rotate(-5deg);font-weight:500}.brand strong{font-size:21px;font-weight:650;letter-spacing:2px}.brand strong span{display:block;font-size:9px;letter-spacing:1.7px;margin-top:5px}.header nav{display:flex;gap:36px;font-size:14px}.header nav a{padding:15px 0;position:relative}.header nav a:after{content:"";position:absolute;bottom:8px;left:0;right:100%;height:2px;background:var(--ink);transition:right .2s}.header nav a:hover:after{right:0}.issue{font-size:12px;letter-spacing:1px}.issue span{margin:0 10px;color:var(--muted)}.hero{display:grid;grid-template-columns:.85fr 1.35fr;gap:52px;align-items:center;padding-block:64px 42px}.eyebrow{display:flex;align-items:center;gap:10px;font-size:13px;letter-spacing:2px;margin-bottom:27px}.eyebrow>span{width:7px;height:7px;background:var(--ink)}h1{font-size:clamp(39px,4.25vw,64px);font-weight:620;line-height:1.35;letter-spacing:-2.8px;white-space:nowrap}.period{color:var(--ink)}.hero-description{font-size:15px;line-height:1.95;color:var(--muted);margin-top:25px}.primary-button{display:inline-flex;align-items:center;justify-content:space-between;gap:42px;background:var(--accent);color:#22241f;padding:16px 21px;font-size:14px;margin-top:35px;border-radius:var(--radius);transition:background .2s}.primary-button:hover{background:#c7e24f}.primary-button span{font-size:22px;line-height:16px}.photo{position:relative;overflow:hidden;border-radius:var(--radius);background:#d5d7cf;display:block;padding:0;width:100%}.photo img{display:block;width:100%;height:100%;object-fit:cover}.hero-photo{aspect-ratio:3/2}.thirds-grid{position:absolute;inset:0;pointer-events:none;opacity:0;transition:opacity .25s}.with-grid .thirds-grid{opacity:1}.thirds-grid i{position:absolute;background:rgba(255,255,255,.65);box-shadow:0 0 1px #0005}.thirds-grid i:nth-child(1),.thirds-grid i:nth-child(2){width:1px;height:100%;top:0;left:33.3333%}.thirds-grid i:nth-child(2){left:66.6667%}.thirds-grid i:nth-child(3),.thirds-grid i:nth-child(4){height:1px;width:100%;left:0;top:33.3333%}.thirds-grid i:nth-child(4){top:66.6667%}.intersection{position:absolute;width:15px;height:15px;border-radius:50%;border:1px solid var(--accent);background:#d6ef6838;box-shadow:0 0 0 5px #d6ef6824;transform:translate(-50%,-50%);top:33.3333%}.right-top{left:66.6667%}.left-top{left:33.3333%}.photo-tag{position:absolute;top:18px;left:18px;background:#f8f8f5e8;color:#22241f;padding:7px 10px;font-size:12px;border-radius:2px}.focus-label{position:absolute;left:calc(66.6667% - 122px);top:calc(33.3333% + 20px);padding:8px 10px;background:var(--accent);color:#22241f;font-size:12px;transition:opacity .25s}.photo:not(.with-grid) .focus-label{opacity:0}.grid-toggle{display:flex;align-items:center;gap:9px;background:#22241fc9;color:white;border:1px solid #ffffff30;padding:10px 12px;border-radius:3px;font-size:12px}.hero-photo>.grid-toggle{position:absolute;bottom:17px;right:17px}.grid-icon{width:14px;height:14px;display:inline-block;border:1px solid currentColor;background:linear-gradient(to right,transparent 30%,currentColor 30%,currentColor 36%,transparent 36%,transparent 64%,currentColor 64%,currentColor 70%,transparent 70%),linear-gradient(to bottom,transparent 30%,currentColor 30%,currentColor 36%,transparent 36%,transparent 64%,currentColor 64%,currentColor 70%,transparent 70%);opacity:.85;flex-shrink:0}.image-caption{display:flex;justify-content:space-between;font-size:11px;color:var(--muted);margin-top:12px;letter-spacing:.3px}.chapter-strip{border-top:1px solid var(--line);border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding-block:23px;font-size:12px}.chapter-strip>span:first-child{font-size:10px;letter-spacing:2px}.chapter-strip>span:nth-child(2){font-size:13px;color:var(--muted)}.chapter-strip a{font-size:12px}.chapter-strip a span{margin-left:24px;font-size:18px}.principle{padding-block:78px 80px}.section-heading{display:flex;align-items:center;gap:20px}.section-number{font-size:12px;font-family:monospace;color:var(--muted)}h2{font-size:30px;font-weight:560;letter-spacing:-.8px;line-height:1.5}.principle-layout{display:grid;grid-template-columns:1fr 1fr;gap:9%;margin-top:38px;align-items:center}.grid-diagram{height:280px;background:var(--panel);padding:20px 35px;position:relative;border-radius:var(--radius)}.diagram-label{font-size:12px;color:var(--muted)}.diagram-inner{position:absolute;inset:52px 50px 45px;border:1px solid #a9aea0}.diagram-inner i{position:absolute;background:#a9aea0}.diagram-inner i:nth-child(1),.diagram-inner i:nth-child(2){height:100%;width:1px;left:33.3333%}.diagram-inner i:nth-child(2){left:66.6667%}.diagram-inner i:nth-child(3),.diagram-inner i:nth-child(4){width:100%;height:1px;top:33.3333%}.diagram-inner i:nth-child(4){top:66.6667%}.diagram-inner b{position:absolute;background:var(--accent);width:12px;height:12px;transform:translate(-50%,-50%);border:2px solid #7c922e;border-radius:50%;left:33.3333%;top:33.3333%;box-shadow:0 0 0 6px #d6ef683d}.diagram-inner b:nth-of-type(2){left:66.6667%}.diagram-inner b:nth-of-type(3){top:66.6667%}.diagram-inner b:nth-of-type(4){top:66.6667%;left:66.6667%}.diagram-bottom{position:absolute;bottom:18px;left:50px;right:50px;display:flex;justify-content:space-around;font:11px monospace;color:var(--muted)}.principle-copy .lead{font-size:25px;line-height:1.65;font-weight:550;margin-bottom:15px}.principle-copy>p:not(.lead){font-size:15px;line-height:1.95;color:var(--muted);max-width:480px}.principle-tip{display:flex;gap:12px;margin-top:20px;border-top:1px solid var(--line);padding-top:19px;font-size:12px;line-height:1.9;color:var(--muted)}.principle-tip strong{font-weight:500;color:var(--ink)}.tiny-cross{font-size:21px;line-height:26px}.compositions{border-top:1px solid var(--line);padding-block:65px 60px}.section-intro{display:flex;align-items:center;justify-content:space-between;margin-top:14px}.section-intro>p{font-size:15px;color:var(--muted)}.text-button{background:none;display:flex;gap:8px;align-items:center;font-size:12px;padding:10px 0}.lessons{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:28px;margin-top:33px}.lesson-top{display:flex;justify-content:space-between;font-size:11px;letter-spacing:.5px;margin-bottom:12px}.lesson-top>span:last-child{color:var(--muted)}.example-photo{aspect-ratio:3/2}.example-photo .intersection{width:12px;height:12px}.lesson h3{font-weight:580;font-size:21px;letter-spacing:-.5px;margin-top:25px}.lesson-summary{font-size:13px;color:var(--muted);line-height:1.9;margin-top:9px}.lesson dl{margin:24px 0 21px;border-top:1px solid var(--line)}.lesson dl>div{display:grid;grid-template-columns:58px 1fr;gap:13px;margin-top:17px}.lesson dt{font-size:12px;line-height:1.9;font-weight:550}.lesson dd{margin:0;font-size:13px;line-height:1.9;color:var(--muted)}.scene-note{font-size:11px;padding-top:16px;border-top:1px solid var(--line);color:var(--muted)}.scene-note span{display:inline-block;padding:3px 6px;background:var(--panel);color:var(--ink);margin-right:8px;border-radius:2px}.asset-note{font-size:11px;color:var(--muted);line-height:1.8;margin-top:28px}.checklist{display:grid;grid-template-columns:1fr 1.65fr;gap:80px;padding:58px;background:var(--panel);border-radius:var(--radius);margin-top:20px;margin-bottom:76px}.checklist-heading h2{font-size:34px;margin-top:18px;line-height:1.6}.checklist-heading>p{font-size:14px;color:var(--muted);line-height:1.9;margin-top:20px}.checklist-items>div{display:flex;gap:24px;padding:23px 0;border-bottom:1px solid #d5d8cd}.checklist-items>div:first-child{padding-top:0}.checklist-items>div:last-child{border:0;padding-bottom:0}.checklist-items>div>span{font:12px monospace;color:var(--muted);padding-top:5px}.checklist-items h3{font-size:17px;font-weight:550}.checklist-items p{font-size:13px;line-height:1.9;color:var(--muted);margin-top:7px}.closing{display:grid;grid-template-columns:1fr 1.65fr;gap:80px;align-items:start;padding-bottom:65px;position:relative}.closing>span{font-size:14px}.closing>p{font-size:25px;line-height:1.7}.closing>a{position:absolute;right:0;bottom:70px;font-size:12px}.closing>a span{margin-left:13px}footer{border-top:1px solid var(--line);padding-block:27px 33px;display:flex;justify-content:space-between;font-size:11px;color:var(--muted)}footer>span:first-child{color:var(--ink);font-weight:550}.footer-en{font-size:9px;font-weight:400;margin-left:10px;letter-spacing:1px}.skip{position:fixed;top:-80px;left:20px;background:var(--accent);padding:12px;z-index:10}.skip:focus{top:12px}
@media(min-width:1500px){.hero{padding-block:75px 48px}.hero-description{font-size:16px}}
@media(max-width:1100px){.shell{width:calc(100% - 64px)}.hero{gap:28px;grid-template-columns:.9fr 1.15fr;padding-top:48px}h1{font-size:43px;letter-spacing:-2px}.hero-description{font-size:13px}.issue{display:none}.header nav{gap:28px}.hero-photo>.grid-toggle{bottom:12px;right:12px}.lessons{gap:20px}.lesson h3{font-size:18px}.lesson dl>div{grid-template-columns:1fr;gap:3px}.principle-layout{gap:6%}.checklist{padding:36px;gap:45px}.closing{gap:45px}.closing>a{position:static;grid-column:2}.principle-copy .lead{font-size:22px}}
@media(max-width:767px){.shell{width:calc(100% - 40px)}.header{height:75px}.brand strong{font-size:18px}.brand strong span{font-size:8px}.brand-symbol{font-size:30px}.header nav{gap:16px;font-size:12px}.header nav a:first-child{display:none}.hero{grid-template-columns:1fr;gap:35px;padding:39px 0 29px}.eyebrow{margin-bottom:21px;font-size:12px}h1{font-size:clamp(37px,8.7vw,62px);line-height:1.3;letter-spacing:-2px}.hero-description{font-size:14px;margin-top:20px}.primary-button{margin-top:25px;padding:14px 18px;gap:44px}.hero-photo{aspect-ratio:3/2}.image-caption{font-size:10px}.photo-tag{font-size:10px;top:12px;left:12px}.focus-label{font-size:10px;left:calc(66.6667% - 105px);top:calc(33.3333% + 15px)}.grid-toggle{font-size:10px;padding:8px 9px}.chapter-strip{padding-block:19px}.chapter-strip>span:first-child{font-size:9px;letter-spacing:1px}.chapter-strip>span:nth-child(2){display:none}.chapter-strip a{font-size:11px}.principle{padding-block:49px}.section-heading{gap:13px}h2{font-size:25px}.principle-layout{grid-template-columns:1fr;gap:25px;margin-top:26px}.grid-diagram{height:240px}.principle-copy .lead{font-size:23px}.principle-copy>p:not(.lead){font-size:15px;max-width:none}.principle-tip{font-size:12px}.compositions{padding-block:46px}.section-intro{display:block;margin-top:12px}.section-intro>p{font-size:14px;line-height:1.8}.text-button{margin-top:8px}.lessons{grid-template-columns:1fr;gap:48px;margin-top:19px}.lesson-top{font-size:11px}.lesson h3{font-size:23px;margin-top:21px}.lesson-summary{font-size:14px}.lesson dl{margin-top:20px}.lesson dl>div{grid-template-columns:65px 1fr;gap:15px}.lesson dt{font-size:13px}.lesson dd{font-size:14px}.scene-note{font-size:12px}.asset-note{margin-top:25px;font-size:11px}.checklist{grid-template-columns:1fr;padding:28px;gap:30px;margin-top:0;margin-bottom:45px}.checklist-heading h2{font-size:29px;margin-top:13px}.checklist-heading h2 br{display:none}.checklist-heading>p{font-size:13px;margin-top:12px}.checklist-heading>p br{display:none}.checklist-items p{font-size:14px}.checklist-items>div{gap:16px;padding-block:20px}.closing{grid-template-columns:1fr;gap:20px;padding-bottom:38px}.closing>p{font-size:24px}.closing>a{grid-column:auto;margin-top:8px}footer{gap:17px;flex-wrap:wrap;padding-bottom:25px;font-size:10px}footer>span:nth-child(2){order:3;width:100%}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important}}
@media(prefers-color-scheme:dark){:root{color-scheme:dark;--paper:#20221e;--ink:#f0f1e9;--muted:#b1b6a8;--line:#40463a;--panel:#2c3027;--white:#272b23}.diagram-inner,.diagram-inner i{border-color:#707967}.diagram-inner i{background:#707967}.checklist-items>div{border-color:var(--line)}.diagram-label,.diagram-bottom{color:var(--muted)}}

/* Reading sizes for the Chinese lesson body. */
.hero-description,.principle-copy>p:not(.lead),.section-intro>p{font-size:16px}.lesson-summary,.lesson dd,.checklist-items p{font-size:16px}.lesson dt,.principle-tip,.text-button{font-size:14px}.lesson dl>div{grid-template-columns:62px 1fr;gap:12px}.scene-note{font-size:12px}.asset-note{font-size:12px}.skip:not(:focus-visible){display:none}@media(max-width:1100px) and (min-width:768px){.lesson dl>div{grid-template-columns:1fr;gap:4px}.hero-description{font-size:14px}}

/* Portrait orientation teaching: retain the full 2:3 source framing. */
.vertical-section{border-top:1px solid var(--line);padding-block:64px 60px}
.vertical-primer{display:grid;grid-template-columns:110px 1fr;gap:28px;align-items:center;padding:24px 28px;background:var(--panel);margin-top:26px;border-radius:var(--radius)}
.format-label{font-size:28px;font-weight:550;line-height:1.35}.format-label small{font-size:12px;font-weight:400;color:var(--muted)}
.vertical-primer p{font-size:16px;line-height:1.9;color:var(--muted);max-width:900px}.vertical-primer strong{font-weight:550;color:var(--ink)}
.vertical-lessons{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:32px;margin-top:35px}
.portrait-photo{aspect-ratio:2/3}.portrait-photo img{object-fit:contain}
.vertical-lesson h3{font-size:22px;font-weight:550;line-height:1.5;margin-top:24px}
.vertical-lesson>p{font-size:16px;line-height:1.95;color:var(--muted);margin-top:12px}
.vertical-lesson ul{list-style:none;padding:0;margin:22px 0 0;display:grid;gap:13px}
.vertical-lesson li{font-size:16px;line-height:1.9;color:var(--muted)}.vertical-lesson li strong{font-weight:550;color:var(--ink)}
.vertical-lesson .vertical-takeaway{border-top:1px solid var(--line);padding-top:16px;margin-top:22px;font-size:14px;color:var(--ink)}
.vertical-crop-note{border-left:3px solid var(--accent);padding:4px 0 4px 22px;margin-top:44px;max-width:960px}.vertical-crop-note h3{font-size:20px;font-weight:550}.vertical-crop-note p{font-size:16px;line-height:1.95;color:var(--muted);margin-top:12px}
@media(max-width:1100px){.vertical-lessons{gap:22px}.vertical-lesson h3{font-size:19px}}
@media(max-width:767px){.vertical-section{padding-block:46px}.vertical-primer{grid-template-columns:1fr;gap:14px;padding:22px}.format-label{font-size:24px}.format-label br{display:none}.format-label small{margin-left:16px}.vertical-lessons{grid-template-columns:1fr;gap:42px;margin-top:26px}.portrait-photo{max-width:420px;margin-inline:auto}.vertical-lesson h3{font-size:23px}.vertical-crop-note{margin-top:34px}.header nav{gap:13px}.header nav a:last-child{display:none}}

/* Chapter 3: each framing has a diagram, a thirds overlay and a clean result. */
[hidden]{display:none!important}
.chapter-crop-description{margin-top:34px}.chapter-crop-description>h3{font-size:22px;font-weight:550}
.frontal-intro,.crop-reading-guide{font-size:16px;line-height:1.95;color:var(--muted);margin-top:15px}
.crop-naming-note{font-size:14px;line-height:1.9;color:var(--muted);border-left:3px solid var(--accent);padding:4px 0 4px 15px;margin-top:19px;max-width:960px}.crop-naming-note strong{color:var(--ink);font-weight:550}
.crop-teaching-notes{display:grid;grid-template-columns:1fr 1fr;gap:36px;background:var(--panel);padding:28px;margin-top:25px;border-radius:var(--radius)}
.crop-teaching-notes h3{font-size:18px;font-weight:550;line-height:1.7;margin:0 0 10px}.crop-teaching-notes p{font-size:16px;line-height:1.9;color:var(--muted)}
.crop-source-link{margin-top:16px;font-size:14px}.crop-source-link a,.crop-download{border-bottom:1px solid var(--line);padding-bottom:3px}.crop-source-link a:hover,.crop-download:hover{color:var(--ink);border-color:var(--ink)}
.crop-lesson{margin-top:48px;padding-top:38px;border-top:1px solid var(--line)}
.crop-lesson .section-heading>h3{font-size:28px;font-weight:550;line-height:1.5;letter-spacing:-.6px}
.crop-lesson-description{font-size:16px;line-height:1.95;color:var(--muted);max-width:1000px;margin-top:14px}
.crop-boundary{font-size:14px;margin-top:12px;display:flex;align-items:center;gap:9px}.crop-boundary:before{content:'';width:17px;height:3px;background:#879d34}
.crop-triptych{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:26px;margin-top:25px}
.crop-view figcaption{font-size:16px;font-weight:550;display:flex;justify-content:space-between;align-items:center;gap:8px;margin-bottom:13px}.crop-view figcaption span{font-size:12px;font-weight:400;color:var(--muted)}
.crop-stage{aspect-ratio:2/3;display:flex;align-items:center;background:var(--panel);border-radius:var(--radius);overflow:hidden}
.crop-photo{isolation:isolate}.framing-map{aspect-ratio:2/3}.framing-result{aspect-ratio:var(--crop-ratio)}
.crop-photo img{position:absolute;inset:0;width:100%;height:100%;max-width:none;object-fit:fill}
.framing-result img{width:var(--result-width);height:var(--result-height);left:var(--result-left);top:var(--result-top)}
.crop-frame{position:absolute;left:var(--frame-x);top:var(--frame-y);width:var(--frame-width);height:var(--frame-height);border:2px solid #d6ef68;box-shadow:0 0 0 100vmax #17201280;pointer-events:none}.crop-download{display:inline-block;font-size:12px;color:var(--muted);margin-top:13px}
@media(max-width:1000px){.crop-triptych{gap:16px}.crop-view figcaption{font-size:14px}.crop-view figcaption span{font-size:11px}}
@media(max-width:767px){.crop-lesson{margin-top:36px;padding-top:29px}.crop-lesson .section-heading>h3{font-size:24px}.crop-triptych{grid-template-columns:1fr;gap:27px}.crop-view{width:min(100%,420px);margin-inline:auto}.crop-stage{aspect-ratio:auto;background:transparent}.crop-view figcaption{font-size:16px}.crop-teaching-notes{grid-template-columns:1fr;gap:25px;padding:23px}}

/* Never stretch a result beyond the available source crop width. */
.framing-result{width:min(100%,var(--source-crop-width,100%));margin-inline:auto}
.crop-detail-note{font-size:12px;line-height:1.8;color:var(--muted);margin-top:12px}

footer{align-items:center;gap:18px;flex-wrap:wrap}
.footer-legal{display:flex;align-items:center;justify-content:flex-end;gap:10px 20px;flex-wrap:wrap;font-size:12px;line-height:1.8}
.footer-legal a:hover{text-decoration:underline;text-underline-offset:3px;color:var(--ink)}
@media(max-width:767px){.footer-legal{width:100%;justify-content:flex-start;gap:5px 16px}}