@charset "UTF-8";
:root{--ink:#172d39;--muted:#5b6b75;--line:#dce4e8;--paper:#fff;--bg:#f4f7f9;--teal:#08786f;--accent:#58dcc5;--navy:#122b37;--blue:#4667b4}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}body{margin:0;color:var(--ink);background:var(--bg);font-family:"Yu Gothic UI","Yu Gothic",Meiryo,system-ui,sans-serif;font-size:16px;line-height:1.85}button,input,textarea{font:inherit}button,a,input,textarea,summary{-webkit-tap-highlight-color:transparent}button{cursor:pointer;border:1px solid var(--line);background:white;color:var(--ink);border-radius:7px;padding:9px 15px;line-height:1.5}button:hover{background:#edf6f4;border-color:#83b8b1}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid #258eaa;outline-offset:4px}a{color:var(--teal);text-underline-offset:4px}p{margin:0 0 20px}h1,h2,h3{line-height:1.5;letter-spacing:.01em}h1{font-size:clamp(26px,2.5vw,38px);margin:14px 0}h2{font-size:22px;margin:34px 0 14px}h3{font-size:18px}header{background:var(--navy);color:white;padding:22px 3.2%;display:flex;align-items:center;justify-content:space-between;gap:20px}.brand{display:flex;gap:14px;align-items:center;color:white;text-decoration:none;font-weight:700;font-size:20px;line-height:1.5}.brand small{display:block;font-size:11px;letter-spacing:.16em;color:#b4c8ce;margin-top:4px}.mark{font-family:Georgia,serif;color:var(--accent);font-size:33px;font-weight:400;border:1px solid #57737b;padding:0 10px;line-height:1.35;border-radius:5px}.mark span{font:10px system-ui;vertical-align:super;margin-left:2px}.header-right{display:flex;align-items:center;gap:24px}.edition{font-size:12px;color:#b9cbd2}.quiet{background:#203e4a;color:white;border-color:#53707b;font-size:14px}.quiet:hover{color:var(--ink)}#note-count{background:#365965;border-radius:4px;padding:1px 6px;color:white;margin-left:7px}.course-bar{display:flex;justify-content:space-between;align-items:center;background:white;border-bottom:1px solid var(--line);padding:0 3.2%;gap:20px}.tabs{display:flex;gap:18px}.tabs button{border:0;border-bottom:3px solid transparent;border-radius:0;background:none;padding:20px 12px;font-size:14px;color:var(--muted)}.tabs strong{margin:0 12px}.tabs button[aria-selected="true"]{border-bottom-color:var(--teal);color:var(--teal)}.tabs button[aria-selected="true"] strong{color:var(--ink)}.tabs button span{font-size:12px}.audience{font-size:11px;letter-spacing:.1em;color:var(--muted)}.layout{max-width:1700px;margin:auto;display:grid;grid-template-columns:245px minmax(0,1fr) 315px}.sidebar{padding:36px 22px 36px 28px}.eyebrow{font-size:11px;letter-spacing:.14em;font-weight:700;color:var(--teal);margin:0 0 8px}.sidebar h2{font-size:17px;margin:0 0 22px}.sidebar nav{display:grid;gap:5px}.chapter-link{font-size:14px;display:flex;gap:11px;text-decoration:none;color:var(--muted);padding:10px 11px;border-radius:5px;line-height:1.7}.chapter-link span{font-size:12px;color:#7b8a93;padding-top:2px}.chapter-link.active{background:#dfeeea;color:#12594f;font-weight:700}.chapter-link:hover{background:#e7edf0}.side-note{margin-top:40px;border-top:1px solid var(--line);padding:22px 10px;font-size:13px;line-height:1.9;color:var(--muted)}.side-note>span{font-weight:700;color:var(--ink);font-size:14px}.side-note p{margin:10px 0}.legend{display:flex;gap:6px}.tag{font-size:11px;display:inline-block;padding:2px 7px;border-radius:4px;font-weight:600}.fact{background:#dcefe9;color:#216453}.idea{background:#e7edf9;color:#3d5995}main{min-width:0;background:white;border-right:1px solid var(--line);border-left:1px solid var(--line);padding:36px clamp(24px,3.2vw,60px) 54px;min-height:80vh}.breadcrumb{display:flex;justify-content:space-between;gap:12px;font-size:12px;color:var(--muted);border-bottom:1px solid var(--line);padding-bottom:18px}.chapter-head{margin:30px 0}.chapter-head .eyebrow{color:var(--blue)}.subtitle{font-size:16px;color:var(--muted);margin-bottom:12px}.chapter-meta{font-size:12px;color:var(--muted)}.lead{font-size:18px;line-height:1.95}.flow{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:#c5dcd8;border:1px solid #c5dcd8;border-radius:9px;overflow:hidden;margin:28px 0}.flow>div{padding:20px 15px;background:#edf6f3;display:flex;flex-direction:column}.flow span{color:var(--teal);font-size:12px;font-weight:700;margin-bottom:8px}.flow strong{font-size:15px}.flow small{color:var(--muted);font-size:12px;margin-top:7px;line-height:1.7}.analogy{border-left:3px solid var(--blue);padding:16px 20px;background:#f0f4fc;margin:26px 0}.analogy>span{font-size:11px;color:var(--blue);font-weight:700;letter-spacing:.1em}.analogy p{margin:8px 0 0;font-size:15px}.callout{background:#eef6f4;border:1px solid #d4e7e1;padding:20px 22px;border-radius:7px;margin:26px 0}.callout strong{font-size:15px;color:#146054}.callout p{margin:8px 0 0;font-size:15px}.table-scroll{overflow-x:auto;margin:20px 0 28px}table{border-collapse:collapse;width:100%;font-size:14px;line-height:1.85}th{text-align:left;background:#edf2f5;font-weight:600}th,td{padding:13px 14px;border-bottom:1px solid var(--line);vertical-align:top}td:first-child{font-weight:600;min-width:110px;width:25%}code{font-family:Consolas,monospace;font-size:.9em;overflow-wrap:anywhere}p code{background:#edf2f5;padding:3px 5px;border-radius:4px}pre{background:var(--navy);color:#e4f1f3;padding:22px;border-radius:8px;overflow:auto;line-height:1.9;font-size:13px;tab-size:2}pre code{overflow-wrap:normal}li{margin:10px 0}ol{padding-left:24px}.widget{border:1px solid var(--line);border-radius:9px;padding:24px;margin:24px 0;background:#fbfcfd}.widget label{font-size:14px;font-weight:600;display:block}.widget small{font-size:12px;color:var(--muted);display:block}.widget input[type="range"]{width:100%;accent-color:var(--teal);margin:24px 0}.widget output{color:var(--teal);font-weight:700}.calculator{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:15px}input[type="number"]{width:100%;min-width:0;border:1px solid #b6c6cd;padding:9px;border-radius:5px;background:white;margin-top:8px}.calc-result{grid-column:1/-1;display:flex;justify-content:space-between;align-items:center;background:#e5f2ed;border-radius:5px;padding:15px;font-size:14px}.calc-result output{font-size:23px}.calculator small{grid-column:1/-1}.prompt-card{position:relative;background:var(--navy);border-radius:8px;padding:16px;margin:20px 0}.copy-prompt{background:#23444e;border-color:#68868f;color:white;font-size:12px;margin-bottom:8px}.prompt-text{white-space:pre-wrap;margin:0;padding:10px 4px;font-size:14px;overflow-wrap:anywhere}.source-list{margin-top:36px;padding-top:20px;border-top:1px solid var(--line);font-size:12px;color:var(--muted)}.source-list a{display:block;margin:5px 0;overflow-wrap:anywhere}.source-list p{margin-bottom:8px}.page-nav{display:flex;justify-content:space-between;gap:18px;margin-top:30px}.page-nav a{display:block;border:1px solid var(--line);border-radius:7px;padding:12px 15px;flex:1;text-decoration:none;font-size:14px}.page-nav a:last-child{text-align:right}.page-nav small{display:block;color:var(--muted);font-size:11px}.question-panel{padding:36px 24px;background:#f4f7f9}.question-sticky{position:sticky;top:25px;max-height:calc(100vh - 50px);overflow:auto;padding:2px 3px 20px}.question-panel h2{font-size:21px;margin:5px 0 8px}.muted{font-size:14px;color:var(--muted)}details{border:1px solid var(--line);background:white;border-radius:7px;margin:10px 0;overflow:hidden}summary{cursor:pointer;padding:13px 16px;font-size:14px;font-weight:600;line-height:1.8;list-style:none;display:flex;gap:12px;align-items:baseline}summary:before{content:'+';color:var(--teal);font-size:18px;font-weight:400}details[open]>summary:before{content:'−'}details[open]>summary{border-bottom:1px solid var(--line)}.faq-body{padding:14px 16px;font-size:14px}.faq-body p{margin:0 0 10px}.faq-body a{font-size:12px}#ask-form{margin-top:27px;border-top:1px solid var(--line);padding-top:23px}#ask-form label{font-size:14px;font-weight:600;display:block;margin-bottom:8px}textarea{width:100%;resize:vertical;border:1px solid #b9c9d0;background:white;color:var(--ink);border-radius:7px;padding:12px;font-size:14px;line-height:1.8}.primary{background:var(--teal);color:white;border-color:var(--teal);width:100%;font-size:14px;margin-top:10px;padding:11px}.primary:hover{background:#095c56;color:white}.secondary{font-size:13px;background:white;margin:8px 0}.micro{font-size:12px;color:var(--muted);line-height:1.8;margin:10px 0}.note-link{border:0;background:transparent;padding:5px 0;font-size:13px;color:var(--teal);text-decoration:underline}.roadmap section{display:flex;gap:22px;padding:22px 0;border-bottom:1px solid var(--line)}.roadmap section>span{font-size:30px;font-family:Georgia,serif;color:var(--teal)}.roadmap h2{font-size:19px;margin:0 0 9px}.roadmap p{margin:0}footer{max-width:1700px;margin:auto;border-top:1px solid var(--line);padding:22px 3%;display:flex;justify-content:space-between;gap:18px;font-size:11px;color:var(--muted)}dialog{border:1px solid var(--line);border-radius:14px;max-width:720px;width:calc(100% - 32px);max-height:85vh;padding:28px;color:var(--ink)}dialog::backdrop{background:#122b3780;backdrop-filter:blur(3px)}.dialog-top{display:flex;align-items:center;justify-content:space-between;gap:20px}.dialog-top h2{margin:0 0 15px}.dialog-top button{font-size:13px}.saved-body{padding:16px}.saved-body label{display:block;font-size:14px}.saved-body .actions{display:flex;flex-wrap:wrap;gap:10px}.saved-body .actions button{font-size:12px;margin-top:12px}.note-meta{font-size:12px;color:var(--muted)}.empty{padding:30px;text-align:center;border:1px dashed #b9c9d0;margin-top:20px;border-radius:8px}.skip{position:absolute;left:10px;top:-70px;background:white;padding:10px;z-index:20}.skip:focus{top:10px}#toast{position:fixed;bottom:20px;left:50%;transform:translateX(-50%);background:var(--navy);color:white;padding:9px 20px;border-radius:6px;font-size:14px;z-index:30;display:none;max-width:90vw}#toast.show{display:block}[hidden]{display:none!important}
@media(min-width:1500px){.layout{grid-template-columns:260px minmax(0,1fr) 340px}.question-panel{padding:36px 30px}}
@media(max-width:1180px){.layout{grid-template-columns:210px minmax(0,1fr)}.question-panel{grid-column:2;border-left:1px solid var(--line);border-top:1px solid var(--line)}.question-sticky{position:static;max-height:none}.edition,.audience{display:none}.sidebar{grid-row:1/3;padding-left:16px;padding-right:16px}.tabs button span{display:none}}
@media(max-width:720px){header{padding:16px}.brand{font-size:16px;gap:9px}.brand small{font-size:9px}.mark{font-size:27px}.header-right{gap:0}.quiet{padding:8px;font-size:12px}.course-bar{padding:0 10px}.tabs{width:100%;gap:0}.tabs button{flex:1;font-size:12px;padding:17px 5px}.tabs strong{margin:0 4px}.layout{display:block}.sidebar{padding:18px 16px}.sidebar>.eyebrow,.sidebar>h2,.side-note{display:none}.sidebar nav{display:flex;overflow-x:auto;gap:7px;padding-bottom:6px}.chapter-link{white-space:nowrap;background:white;border:1px solid var(--line);padding:7px 10px;font-size:12px;gap:7px}.chapter-link span{font-size:11px}main{border:0;border-top:1px solid var(--line);padding:25px 20px 35px}.chapter-head{margin:24px 0}.lead{font-size:17px}.flow{grid-template-columns:1fr}.flow>div{padding:13px 17px;display:grid;grid-template-columns:25px 1fr;column-gap:8px}.flow span{grid-row:1/3;margin:3px 0}.flow small{grid-column:2;margin:2px 0}.flow strong{font-size:15px}.question-panel{padding:25px 20px;border-left:0}.calculator{grid-template-columns:1fr}.calc-result{display:block}.calc-result output{display:block}.page-nav{flex-direction:column;gap:8px}.page-nav a:last-child{text-align:left}footer{flex-direction:column;padding:20px;gap:4px}h2{font-size:20px}.breadcrumb{font-size:11px}dialog{padding:20px}td,th{padding:11px}pre{padding:16px}.tabs button[aria-selected="true"]{background:#f0f7f5}.question-sticky{padding:0}}
#quick-question{display:none}
.term-link{display:inline;border:0;border-bottom:1px dotted var(--teal);border-radius:0;padding:0 1px;color:var(--teal);background:#e8f5f155;font:inherit;line-height:inherit;text-align:inherit;cursor:help}.term-link:hover{background:#d6efe7;border-color:var(--teal)}
#term-panel{background:white;border:1px solid #87bdb3;border-top:4px solid var(--teal);border-radius:8px;padding:18px;margin-bottom:25px;max-height:calc(100vh - 100px);overflow:auto}#term-panel h2,#term-dialog h2{font-size:22px;margin:8px 0 15px;overflow-wrap:anywhere}#term-panel p,#term-dialog p{font-size:15px;line-height:1.9}#term-panel a,#term-dialog a{font-size:14px}.term-top{display:flex;align-items:center;justify-content:space-between;gap:8px}.term-top .eyebrow{font-size:12px!important;margin:0}.term-close{padding:5px 9px;font-size:12px}.term-example{background:#edf6f3;padding:14px;border-radius:5px;margin:18px 0}.term-example strong{font-size:13px}.term-example p{margin:8px 0 0}.term-note{border-left:3px solid var(--blue);padding-left:12px}#term-dialog{max-width:520px}#term-dialog::backdrop{background:#122b3770}
.course-bar .tabs{min-width:0}.course-bar .audience{flex-shrink:0}
@media(max-width:1400px){.course-bar .audience{display:none}}
@media(max-width:720px){.tabs button{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;padding:12px 3px;min-width:0}.tabs strong{font-size:12px;white-space:nowrap;margin:0}.tabs button span{display:none}}
@media(max-width:1180px){#quick-question{display:block;position:fixed;bottom:18px;right:18px;z-index:10;background:var(--teal);color:white;border-color:var(--teal);box-shadow:0 3px 15px #122b3730;font-size:13px}footer{padding-bottom:80px}.question-panel{padding-bottom:80px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}