:root{--ink:#203244;--muted:#536577;--accent:#15675e;--paper:#fff;--bg:#f3f5f4;--line:#d8e1dd;--code:#172b38}*{box-sizing:border-box}html{scroll-behavior:auto}body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.75 'Segoe UI',Arial,sans-serif;-webkit-user-select:none;user-select:none}input,textarea,select{user-select:auto}a{color:var(--accent);overflow-wrap:anywhere}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #be7700;outline-offset:3px}.skip{position:absolute;top:-80px;left:16px;background:white;padding:10px}.skip:focus{top:10px}header{background:var(--paper);border-bottom:1px solid var(--line);padding:40px max(22px,calc((100vw - 1140px)/2)) 28px}.eyebrow{text-transform:uppercase;letter-spacing:.11em;font-size:13px;font-weight:700;color:var(--accent)}h1{font:700 clamp(30px,4vw,46px)/1.2 Georgia,serif;max-width:900px;margin:12px 0 16px}header p{max-width:850px;margin:8px 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/* Editorial learning hierarchy — shared by all 14 Oracle chapters. */
main{overflow-wrap:anywhere}
.lesson-toolbar{display:flex;align-items:center;gap:22px;margin:0 0 26px;padding:0 0 24px;border-bottom:1px solid var(--line)}
.save-pdf{display:inline-flex;align-items:center;justify-content:center;gap:10px;flex-shrink:0;min-height:48px;padding:12px 20px;background:var(--accent);border:1px solid var(--accent);border-radius:5px;color:#fff;font-weight:700;font-size:15px;text-decoration:none}
.save-pdf:hover{background:#0e534b;border-color:#0e534b}
header .lesson-toolbar{margin:22px 0 0;padding:18px 0 0;border-bottom:0;border-top:1px solid var(--line)}
.lesson-toolbar p{font-size:14px;line-height:1.6;color:var(--muted);margin:0;max-width:480px}
.pdf-only{display:none}
.section-kicker{font-size:12px;font-weight:700;letter-spacing:.07em;text-transform:uppercase;color:var(--accent);margin-bottom:10px}
.theory-editorial h2{font-size:32px;max-width:650px;margin-bottom:16px}
.theory-intro{font-size:19px;line-height:1.75;color:#364e5b;margin-bottom:26px;max-width:72ch}
.concept-panel{padding:22px 26px;background:#edf5f0;border:1px solid #c8dbd0;margin:24px 0 28px}
.concept-panel h3{font:700 21px/1.35 Georgia,serif;margin:0 0 12px}
.concept-panel ul{margin:0;padding-left:22px}
.concept-panel li{padding-left:3px;margin:9px 0;line-height:1.65}
.theory-map{margin:30px 0}
.theory-map h3,.comparison-block h3,.learning-flow h3{font:700 22px/1.35 Georgia,serif;margin:0 0 16px}
.theory-map ol{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));column-gap:28px}
.theory-map li{margin:0;border-bottom:1px solid var(--line);min-width:0}
.theory-map a{display:flex;align-items:baseline;gap:11px;padding:13px 2px;min-height:48px;font-size:15px;line-height:1.55;text-decoration:none}
.theory-map a span{font:700 15px/1.4 Consolas,'Liberation Mono',monospace;color:var(--muted);min-width:26px}
.theory-map a:hover{color:#0e534b;text-decoration:underline;text-underline-offset:4px}
.comparison-block{margin:32px 0 12px}
.concept-table{font-size:15px;line-height:1.6;margin:0;table-layout:fixed}
.concept-table th{background:#edf3f0;font-size:14px;letter-spacing:.01em}
.concept-table th:first-child{width:29%}.concept-table th:nth-child(2){width:34%}.concept-table th:nth-child(3){width:37%}
.concept-table td{padding:12px 10px;overflow-wrap:anywhere}
.concept-table td:first-child{font-weight:600}
.inline-sql{font-size:.88em;line-height:inherit;background:#edf1ef;color:#254b44;padding:1px 4px;border-radius:3px;white-space:normal;overflow-wrap:anywhere}
.theory-article{padding:32px 0 28px;border-bottom:1px solid var(--line);scroll-margin-top:26px}
.theory-heading{display:flex;align-items:baseline;gap:16px;margin-bottom:18px}
.theory-number{font:700 23px/1.3 Georgia,serif;color:var(--accent);min-width:33px;font-variant-numeric:tabular-nums}
.theory-heading h3{font:700 25px/1.35 Georgia,serif;margin:0;letter-spacing:-.015em;min-width:0;overflow-wrap:anywhere}
.theory-lead{font-size:18px;font-weight:600;line-height:1.75;margin:0 0 16px;max-width:72ch;color:#203e48}
.theory-body p{line-height:1.85;max-width:75ch;margin:0 0 18px}
.theory-points{background:#f7f8f5;padding:17px 22px;margin-top:20px}
.theory-points h4{margin:0 0 10px;font-size:13px;font-weight:700;letter-spacing:.07em;text-transform:uppercase;color:var(--muted)}
.theory-points ul{padding-left:20px;margin:0}
.theory-points li{margin:10px 0;line-height:1.75;padding-left:3px}
.theory-points li::marker{color:var(--accent)}
.learning-flow{padding:26px 0 4px;margin-top:16px}
.learning-flow ol{list-style:none;display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:14px;margin:0;padding:0}
.learning-flow li{display:flex;flex-direction:column;align-items:flex-start;gap:10px;padding:15px 0 0;border-top:2px solid #bed3c9;font-size:15px;line-height:1.65;min-width:0;margin:0}
.flow-index{font:700 16px/1.2 Georgia,serif;color:var(--accent)}
.flow-caption{font-size:14px;line-height:1.65;color:var(--muted);margin:18px 0 0}
@media(max-width:650px){
 .lesson-toolbar{align-items:flex-start;flex-direction:column;gap:12px}
 .save-pdf{width:100%;max-width:290px;min-height:48px}
 .theory-editorial h2{font-size:28px}
 .theory-intro{font-size:17px}
 .concept-panel{padding:18px;margin:22px 0}
 .theory-map ol{grid-template-columns:1fr}
 .theory-heading{gap:11px}.theory-heading h3{font-size:23px}.theory-number{font-size:21px;min-width:30px}
 .theory-lead{font-size:17px}.theory-body p{line-height:1.8}
 .theory-points{padding:16px}.theory-article{padding:26px 0}
 .learning-flow ol{grid-template-columns:1fr;gap:0}
 .learning-flow li{flex-direction:row;align-items:baseline;border-top:1px solid var(--line);padding:12px 0;font-size:16px;gap:14px}
 .flow-index{min-width:17px}
 .concept-table thead{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
 .concept-table,.concept-table tbody,.concept-table tr{display:block;width:100%}
 .concept-table tr{padding:12px 0;border-bottom:1px solid var(--line)}
 .concept-table td{display:grid;grid-template-columns:92px minmax(0,1fr);gap:12px;border:0;padding:5px 0;font-size:14px;font-weight:400}
 .concept-table td::before{content:attr(data-label);font-size:12px;font-weight:700;color:var(--muted);line-height:1.7}
 .concept-table td:first-child{font-weight:600}
}
@media print{
 @page{size:A4}
 html{font-size:12pt}body{font:12pt/1.5 'Segoe UI',Arial,sans-serif;color:#182e38;background:#fff;-webkit-print-color-adjust:exact;print-color-adjust:exact;user-select:auto}
 header{padding:0 0 14pt;margin:0 0 14pt;border-bottom:1pt solid #c8d3cd}
 h1{font-size:25pt;line-height:1.2;margin:8pt 0 10pt;max-width:none}
 header p,.meta,.manual-note,.environment p,.note,.warning,.references,.topic-list,.roadmap,.eyebrow{font-size:12pt!important;line-height:1.5}
 header .eyebrow{font-size:12pt;letter-spacing:.04em}
 .layout{display:block;width:100%;max-width:none;padding:0;margin:0}
 main{width:100%;border:0;padding:0;margin:0}
 nav,.skip,.lesson-toolbar,.manual-note,.lab-controls,.quiz button,.quiz-feedback,.video-frame,.pager,body>footer{display:none!important}
 .pdf-only{display:block;margin:0 0 16pt;font-size:12pt;line-height:1.5}
 section{padding-bottom:15pt;margin-bottom:17pt;break-inside:auto}
 h2{font-size:20pt;line-height:1.3;margin:0 0 12pt;break-after:avoid}
 h3{font-size:16pt;line-height:1.35;margin:18pt 0 10pt;break-after:avoid}
 h4{font-size:13pt;line-height:1.4;break-after:avoid}
 p,li{font-size:12pt;line-height:1.5;orphans:3;widows:3}
 a{color:#13584c;text-decoration:underline;overflow-wrap:anywhere}
 .section-kicker{font-size:12pt;letter-spacing:.02em;margin-bottom:8pt}
 .theory-editorial h2{font-size:22pt}
 .theory-intro,.theory-lead{font-size:12pt;line-height:1.55;max-width:none}
 .concept-panel{padding:12pt 14pt;margin:15pt 0;break-inside:avoid;border:1pt solid #c8dbd0}
 .concept-panel h3,.theory-map h3,.comparison-block h3,.learning-flow h3{font-size:16pt;margin:0 0 10pt}
 .theory-map{margin:15pt 0;break-inside:avoid}
 .theory-map ol{display:block}
 .theory-map a{min-height:0;padding:6pt 0;font-size:12pt;line-height:1.4;gap:10pt}
 .theory-map a span{font-size:12pt;min-width:22pt}
 .comparison-block{margin:18pt 0}
 .table-wrap{overflow:visible;max-width:none}
 table,.concept-table{display:table;width:100%;table-layout:fixed;font-size:12pt!important;line-height:1.4}
 .concept-table thead,thead{display:table-header-group;position:static;clip:auto;width:auto;height:auto;padding:0;margin:0;overflow:visible;white-space:normal}
 .concept-table tbody{display:table-row-group}
 .concept-table tr,tr{display:table-row;break-inside:avoid}
 th,td,.concept-table td{display:table-cell;font-size:12pt!important;line-height:1.4;padding:7pt!important;border-bottom:1pt solid #d8e1dd;overflow-wrap:anywhere;min-width:0!important}
 .concept-table td::before{display:none}
 .concept-table th{font-size:12pt}
 .theory-article{padding:18pt 0 15pt;break-inside:auto}
 .theory-heading{margin-bottom:10pt;gap:12pt;break-after:avoid}
 .theory-heading h3{font-size:17pt;margin:0}
 .theory-number{font-size:17pt;min-width:27pt}
 .theory-body p{line-height:1.55;margin-bottom:12pt;max-width:none}
 .theory-points{padding:10pt 13pt;margin:12pt 0 0;break-inside:auto}
 .theory-points h4{font-size:12pt;margin:0 0 8pt;letter-spacing:.02em}
 .theory-points li{font-size:12pt;line-height:1.5;margin:8pt 0}
 .inline-sql{font-size:12pt;line-height:inherit;padding:0 2pt;overflow-wrap:anywhere}
 .learning-flow{margin-top:12pt;padding-top:15pt;break-inside:avoid}
 .learning-flow ol{display:block}
 .learning-flow li{display:flex;flex-direction:row;align-items:baseline;gap:12pt;font-size:12pt;padding:7pt 0;border-top:1pt solid #d8e1dd}
 .flow-index{font-size:12pt;min-width:15pt}.flow-caption{font-size:12pt;margin-top:10pt}
 .opening{padding:12pt;background:#faf6eb;break-inside:auto}
 .quiz{padding:10pt;margin:12pt 0;break-inside:avoid}
 .quiz legend,.quiz label,.quiz label span{font-size:12pt;line-height:1.5}
 .quiz label{min-height:0;margin:7pt 0;align-items:flex-start}
 .quiz input[type=radio]{display:none}
 .quiz label::before{content:'○';display:inline-block;margin-right:6pt;color:#203244}
 .lab{padding:12pt;break-inside:auto}
 .lab-output{min-height:0;padding-top:8pt}
 pre{font-size:12pt!important;line-height:1.4!important;background:#f3f5f4;color:#152a33;padding:10pt;white-space:pre-wrap;overflow:visible;overflow-wrap:anywhere;word-break:break-word;max-width:100%;break-inside:auto;border:1pt solid #d8e1dd;border-radius:0;user-select:auto}
 pre code{font-size:12pt!important;white-space:pre-wrap;line-height:1.4!important}
 details{padding:10pt;break-inside:auto}summary{font-size:12pt;min-height:0}
 .video-references li{break-inside:avoid}.environment{break-inside:auto}
}

/* Static examples: no UI controls or browser simulation. */
.worked-example{margin:22px 0 0;padding:22px 0 0;border-top:1px solid var(--line)}
.worked-example h3{font:700 24px/1.4 Georgia,serif;margin:0 0 14px}
.example-context{font-size:17px;line-height:1.8;max-width:75ch}
.example-table{table-layout:fixed;font-size:15px;line-height:1.65}
.example-table th,.example-table td{overflow-wrap:anywhere}
.example-takeaway{margin-top:20px}
@media(max-width:650px){
 .example-table thead{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
 .example-table,.example-table tbody,.example-table tr{display:block;width:100%}
 .example-table tr{padding:12px 0;border-bottom:1px solid var(--line)}
 .example-table td{display:grid;grid-template-columns:90px minmax(0,1fr);gap:12px;border:0;padding:5px 0;font-size:14px}
 .example-table td::before{content:attr(data-label);font-size:12px;font-weight:700;color:var(--muted)}
 .worked-example h3{font-size:22px}
}
@media print{
 .worked-example{break-inside:auto;padding-top:14pt;margin-top:14pt}
 .worked-example h3{font-size:16pt}
 .example-context,.example-takeaway{font-size:12pt;line-height:1.5}
 .example-table{display:table;table-layout:fixed;font-size:12pt}
 .example-table thead{display:table-header-group;position:static;clip:auto;width:auto;height:auto;margin:0;padding:0;overflow:visible;white-space:normal}
 .example-table tbody{display:table-row-group}
 .example-table tr{display:table-row;break-inside:avoid}
 .example-table td{display:table-cell;padding:7pt;font-size:12pt}
 .example-table td::before{display:none}
}