/* Shared reading and interaction rules for all 30 Boole lessons. */
:root{--ink:#28362e;--muted:#526158;--green:#365f4b;--paper:#f7f4ec;--soft:#edf4ef;--line:#d9dfd7;--reading-size:19px}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%}
body{font-family:'LTCT Noto Sans KR','Noto Sans KR','Malgun Gothic',sans-serif;font-size:var(--reading-size);line-height:1.85;word-break:keep-all;overflow-wrap:anywhere;color:var(--ink)}
.wrap{width:100%;max-width:1120px;padding:36px 28px 64px}
.wrap *{min-width:0}
a{color:#46664f;text-decoration:none}a:hover{text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:4px}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #b78337;outline-offset:3px}
.top,.site{flex-wrap:wrap;line-height:1.6;font-size:16px;padding:16px max(20px,calc((100vw - 1064px)/2))}
.hero{gap:28px;grid-template-columns:minmax(0,1.5fr) minmax(0,.65fr);padding:16px 0 28px}
.hero h1{font-size:clamp(28px,3.7vw,42px);line-height:1.42;letter-spacing:-.035em}
.hero .dek,.hero p:not(.eyebrow){font-size:19px;line-height:1.8}
.eyebrow,.crumb,.kicker{font-size:15px;line-height:1.7;letter-spacing:0}
.portrait{margin:0;padding:18px;background:var(--paper)}.portrait img{max-height:230px;width:auto;max-width:100%;object-fit:contain}.portrait figcaption{font-size:14px;line-height:1.65}
.tools{font-size:16px;padding:14px 0;gap:8px}.tools button{font:inherit;min-height:44px;padding:8px 12px}.tools button[aria-pressed=true]{background:var(--green);color:white;border-color:var(--green)}
.intro{max-width:820px;font-size:var(--reading-size);line-height:1.85;margin:28px auto}
.grid{grid-template-columns:190px minmax(0,1fr);gap:32px}.article,.toc{min-width:0}
.toc{font-size:16px}.toc a{line-height:1.65;padding:9px 0}.toc strong{color:var(--green)}
.article section{padding:28px 0;scroll-margin-top:16px}.article h2{font-size:clamp(23px,2.6vw,29px);line-height:1.5;letter-spacing:-.025em;margin:0 0 18px}.article h3{font-size:21px;line-height:1.5}
.article p{line-height:1.85}.quote-note,.application{border:1px solid #ded8cc;border-left:3px solid #9a7d51;border-radius:10px;padding:20px;line-height:1.85;background:#f8f4eb}.application{border-color:#ccddd0;border-left-color:#52775c;background:#eef5ef}
.formula{font-family:'LTCT Noto Sans KR','Noto Sans KR','Malgun Gothic',sans-serif;font-size:clamp(20px,2.5vw,28px)!important;line-height:1.75;letter-spacing:0;white-space:normal;overflow-wrap:anywhere;word-break:normal;padding:18px 20px;border:1px solid #dce5de;border-radius:12px;background:#f2f6f1;color:#365542;margin:22px 0}.term{font-family:inherit;overflow-wrap:anywhere}
.lab{border-color:#ccd8ce;border-radius:14px;margin:24px 0}.lab-head{background:#eff4ee;padding:18px 20px}.lab-head strong{font-size:21px;line-height:1.55}.lab-head span{display:block;margin-top:8px;font-size:16px;line-height:1.7}.lab-body{padding:18px 20px}
.lab button,.lab select,.lab input{font-family:inherit;max-width:100%}.lab button,.lab select{font-size:16px;line-height:1.5}.lab button{min-height:44px;cursor:pointer;border:1px solid #b9c7bc;border-radius:8px;background:#fff;color:var(--ink);padding:8px 12px;white-space:normal;overflow-wrap:anywhere}.lab button.active,.lab button.on,.lab button[aria-pressed=true]{background:var(--green);color:#fff;border-color:var(--green)}.lab-actions{gap:8px}.lab select{min-height:44px;padding:8px;background:#fff;border:1px solid #b9c7bc;border-radius:8px}
.lab .bit{font-size:20px}.lab-note,.sources,.footer,.note{font-size:16px;line-height:1.8}.lab-note{color:#526158}.result{font-size:var(--reading-size);line-height:1.8;background:#edf4ef;padding:16px}.result p{margin:10px 0 0}.count-control button{width:44px;height:44px;flex-shrink:0}
.article pre{max-width:100%;white-space:pre-wrap;overflow-wrap:anywhere;font-size:16px;line-height:1.75}.article ol,.article ul{padding-left:1.4em}
table{font-size:17px}th{font-size:16px;line-height:1.6}td{line-height:1.7}table small{font-size:15px}.sources a{text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:4px}
.series-nav a{padding:10px 12px;border:1px solid var(--line);border-radius:8px;font-size:16px;min-height:44px;background:#f8faf7}
.status{border:1px solid #d6e1d7;border-radius:12px;border-left:3px solid #52775c;background:#f0f5ee;font-size:18px;line-height:1.8;padding:20px;margin:28px 0}.status strong{font-size:22px;color:#34513f}
.episodes{gap:14px;margin-top:24px}.episode{grid-template-columns:64px minmax(0,1fr);gap:18px;padding:22px;background:#fff;border-color:#d9e1d8}.episode:hover{background:#f3f7f1;text-decoration:none}.episode strong{font-size:21px;line-height:1.55;color:#293f31}.episode span:last-child{font-size:17px;line-height:1.8}.episode .num{font-size:15px;color:#506d50}.episodes .episode:nth-child(3n+2){background:#f8f6f0}.episodes .episode:nth-child(3n){background:#f3f7f3}
@media(max-width:760px){
 :root{--reading-size:18px}.wrap{padding:24px 18px 52px}.hero{grid-template-columns:minmax(0,1fr);gap:22px}.hero h1{font-size:29px}.hero .dek,.hero p:not(.eyebrow){font-size:18px}.portrait{order:0;display:grid;grid-template-columns:90px minmax(0,1fr);gap:16px;align-items:center;text-align:left;padding:14px}.portrait img{max-height:120px;max-width:90px}.portrait figcaption{margin:0;font-size:14px}
 .grid{grid-template-columns:minmax(0,1fr);gap:20px}.toc{position:static;border:1px solid var(--line);border-radius:12px;background:#f7f9f4;padding:16px}.toc nav{display:flex;flex-wrap:wrap;gap:8px;overflow:visible}.toc a{white-space:normal;font-size:15px;padding:8px 11px;background:#fff;border:1px solid var(--line);border-radius:8px}
 .article h2{font-size:24px}.article h3{font-size:20px}.lab-head,.lab-body{padding:16px 14px}.lab-head strong{font-size:20px}.quote-note,.application{padding:16px}.formula{padding:15px;font-size:22px!important}.formula sub,.formula sup{font-size:.7em}
 table[data-responsive="cards"] td{display:flex;align-items:center;justify-content:space-between;gap:12px;text-align:right;min-height:44px;flex-wrap:wrap;padding:7px 4px}table[data-responsive="cards"] td:before{font-size:15px;flex:0 0 36%;color:#526158}table[data-responsive="cards"] td>*{max-width:100%}table[data-responsive="cards"] tr{padding:10px 12px;background:#fcfdfb}table[data-responsive="cards"] td:first-child{background:#eef4eb;border-radius:6px;font-weight:600}table[data-responsive="cards"] td[colspan]:before{display:none}
 .lab .kmap{font-size:15px}.lab .kmap th,.lab .kmap td{padding:6px 2px}.lab .kmap td button{width:100%;min-width:0;min-height:44px;font-size:20px;padding:6px 2px}.group-tags span{font-size:13px}
 .lab .matrix{min-width:0;table-layout:fixed;width:100%;font-size:15px}.lab .matrix td,.lab .matrix th{padding:6px 1px;font-size:15px}.lab .matrix button{min-width:0;width:100%;font-size:18px;padding:6px 0}.matrix-wrap{max-width:100%}
 .article .circuit,.article .gate-card{overflow-x:auto}.article .circuit svg,.article .gate-card svg{max-width:none;min-width:440px}
 .episode{grid-template-columns:minmax(0,1fr);gap:8px;padding:18px}.episode strong{font-size:21px}.episode .num{font-size:15px}.status strong{font-size:21px}.status{font-size:18px;padding:18px}
 .lab .state-card strong,.lab .adder-card strong,.lab .bit strong,.lab .ratio-stage strong,.lab .signal strong{font-size:28px}.lab .input-bits button{font-size:20px;padding:10px}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

.nand-stages{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.nand-stage{display:grid;gap:8px;border:1px solid #cad8cc;border-radius:12px;padding:16px;background:#f0f5ed;font-size:17px}.nand-stage strong{font-size:21px}.nand-stage b{color:#365f4b;font-size:23px}@media(max-width:760px){.nand-stages{grid-template-columns:minmax(0,1fr)}}

/* One portrait treatment shared by the index and every episode. */
.portrait figcaption{font-size:16px;text-align:left}.portrait-name{display:block;font-size:18px;line-height:1.6;color:var(--ink)}.portrait-years{display:block;font-size:16px;font-weight:400;color:var(--muted)}.portrait-bio{display:block;margin-top:8px;line-height:1.7}.portrait-source{margin-top:10px;font-size:15px;line-height:1.7}.portrait-source summary{cursor:pointer;min-height:44px;padding:9px 0;color:var(--green);text-decoration:underline;text-underline-offset:4px}.portrait-source summary:focus-visible{outline:3px solid #b78337;outline-offset:3px}.hero .portrait-source p{font-size:15px;margin:8px 0;line-height:1.7}.portrait-source a{overflow-wrap:anywhere;text-decoration:underline}.portrait{align-items:start}@media(max-width:760px){.portrait img{align-self:start}.portrait figcaption{font-size:16px}.portrait-name{font-size:18px}}