@import url('https://fonts.googleapis.com/css2?family=Sarabun:wght@400;500;600;700&family=Source+Serif+4:wght@400;600;700&display=swap');
:root{--paper:#f6f7f5;--surface:#fff;--ink:#14212e;--muted:#63717b;--line:#dde3e1;--accent:#1c6e8c;--tint:#e4eff2;--gold:#a6690f;--warm:#fbf6ed;--red:#aa3a2c;--danger:#f7e9e6;--read-size:18px}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:95px}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.85 'Sarabun',sans-serif}button,input,select{font:inherit;color:inherit}button{cursor:pointer}button:disabled{opacity:.4;cursor:not-allowed}a{color:var(--accent)}a,button,input,select,summary{outline-offset:4px}a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid var(--gold)}h1,h2,h3{line-height:1.55}h1,h2{font-family:'Source Serif 4','Sarabun',serif}h1{font-size:38px;letter-spacing:-.6px;margin:10px 0 17px}p{margin:0 0 19px}header{height:75px;position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--paper),transparent 5%);backdrop-filter:blur(10px);display:flex;align-items:center;gap:36px;padding:0 30px;border-bottom:1px solid var(--line)}.brand{font-family:'Source Serif 4',serif;text-decoration:none;font-size:22px;font-weight:700;color:var(--ink);white-space:nowrap}.brand span{font:10px ui-monospace,monospace;letter-spacing:1px;color:var(--accent);margin-left:8px}header nav{display:flex;align-self:stretch;gap:27px}header nav a{display:flex;align-items:center;text-decoration:none;padding:0 12px;color:var(--muted);font-weight:600;font-size:15px;border-bottom:3px solid transparent}header nav a.active{border-color:var(--accent);color:var(--accent)}.tools{margin-left:auto;display:flex;gap:7px}.tools button{width:33px;height:33px;border:1px solid var(--line);border-radius:5px;background:var(--surface);font-size:12px}.skip{position:fixed;top:-100px;z-index:50;background:var(--surface);padding:10px}.skip:focus{top:0}.layout{display:grid;grid-template-columns:245px minmax(0,1fr);max-width:1320px;margin:auto}.toc{position:sticky;top:75px;align-self:start;height:calc(100vh - 75px);overflow-y:auto;border-right:1px solid var(--line);padding:27px 18px 35px}.label{font:10px/1.8 ui-monospace,monospace;letter-spacing:1.1px;color:var(--muted);text-transform:uppercase}.toc .label{margin:16px 0 9px}.toc-links a{display:block;font-size:12px;line-height:1.85;padding:7px 8px;margin:3px 0;text-decoration:none;color:var(--muted);border-left:2px solid transparent;border-radius:3px}.toc-links a:hover,.toc-links a.current{color:var(--accent);background:var(--tint);border-left-color:var(--accent)}.toc-links a.sub{font-size:11px;margin-left:11px;padding-top:4px;padding-bottom:4px}.toc input{width:100%;background:var(--surface);border:1px solid var(--line);border-radius:6px;padding:9px;font-size:12px}.search-actions{display:flex;align-items:center;gap:7px;margin:8px 0}.search-actions button{border:1px solid var(--line);background:var(--surface);border-radius:4px;font-size:11px;padding:3px 7px}.search-actions span{font:10px ui-monospace,monospace;color:var(--muted)}.sidebar-note{font-size:11px;color:var(--muted);border-top:1px solid var(--line);padding-top:15px;margin-top:24px;line-height:1.9}.reading{min-width:0;padding:0 43px 65px}.hero{padding:39px 0 30px;border-bottom:1px solid var(--line)}.hero .lead{font-size:17px;line-height:2;color:var(--muted);max-width:740px}.eyebrow{font:11px/1.8 ui-monospace,monospace;color:var(--accent);letter-spacing:1px}.tags{display:flex;gap:8px;flex-wrap:wrap;margin:19px 0}.tag{font-size:11px;border:1px solid var(--line);border-radius:5px;padding:5px 10px;background:var(--surface);color:var(--muted)}.btns{display:flex;align-items:center;gap:9px;flex-wrap:wrap}.btn{border:1px solid var(--line);background:var(--surface);color:var(--ink);border-radius:6px;min-height:39px;padding:8px 14px;font-size:12px;font-weight:600;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;gap:8px}.btn.primary{background:var(--accent);color:#fff;border-color:var(--accent)}.btn:hover{border-color:var(--accent)}.content{min-width:0}.content>h2{font-size:29px;padding:32px 0 14px;margin:27px 0 21px;border-bottom:1px solid var(--line);scroll-margin-top:94px}.content>h3{font:600 21px/1.7 'Sarabun',sans-serif;margin:31px 0 15px;scroll-margin-top:94px;color:var(--ink)}.content p,.content li{font-size:var(--read-size);line-height:2.05;overflow-wrap:break-word}.content li{margin:7px 0}.content ol,.content ul{padding-left:26px;margin:0 0 23px}.content strong{font-weight:600}.content blockquote{border-left:2px solid var(--accent);padding:6px 13px;margin:18px 0 25px;color:var(--muted);background:var(--tint);border-radius:0 5px 5px 0}.content blockquote p{font-size:12px;margin:0}.table-scroll{overflow-x:auto;max-width:100%;border:1px solid var(--line);border-radius:6px;margin:24px 0}.data-table{width:100%;border-collapse:collapse;font-size:15px;line-height:1.95;min-width:430px;background:var(--surface)}.data-table th,.data-table td{text-align:left;vertical-align:top;padding:12px 15px;border-bottom:1px solid var(--line);min-width:90px}.data-table th{font-size:12px;background:var(--tint);color:var(--accent);font-weight:600}.data-table tr:last-child td{border-bottom:0}.codebox{font:12px/1.95 ui-monospace,SFMono-Regular,Consolas,monospace;border:1px solid var(--line);background:#eaf0f1;color:#21495a;padding:19px 21px;border-radius:7px;overflow-x:auto;max-width:100%;margin:23px 0}.content code:not(pre code){font: .85em ui-monospace,monospace;padding:2px 4px;background:var(--tint);color:var(--accent);border-radius:3px;overflow-wrap:anywhere}.theory-note{padding:19px 22px;background:var(--warm);border:1px solid #e5d2ac;border-left:3px solid var(--gold);border-radius:0 6px 6px 0;margin:25px 0}.theory-note>strong{color:var(--gold);font-size:14px;display:block;margin-bottom:8px}.theory-note p{font-size:16px;margin:0;line-height:2}.term{border:0;border-bottom:1px dotted var(--accent);color:var(--accent);background:transparent;padding:0;font:inherit;line-height:inherit}.glossary{margin-top:38px;border-top:1px solid var(--line);padding-top:20px}.glossary h2{font-size:28px}.glossary details{border:1px solid var(--line);background:var(--surface);padding:12px 16px;margin:9px 0;border-radius:6px}.glossary summary{cursor:pointer;font-size:14px;font-weight:600;color:var(--accent)}.glossary p{font-size:15px;line-height:1.95;margin:12px 0 5px}.glossary code{font-size:11px;color:var(--muted);overflow-wrap:anywhere}.reading-progress{position:fixed;left:0;top:72px;height:3px;background:var(--accent);z-index:25;width:0}.search-hit{background:#f5dea5;color:#14212e;border-radius:2px}.search-hit.selected{background:var(--accent);color:#fff}.mobile-toc{display:none}.to-top{position:fixed;right:18px;bottom:18px;width:37px;height:37px;border:1px solid var(--line);border-radius:50%;background:var(--surface);color:var(--accent);z-index:5}.footer{font-size:11px;color:var(--muted);border-top:1px solid var(--line);margin-top:35px;padding-top:18px;line-height:1.9}.mock-page{max-width:1060px;margin:auto;padding:35px 30px 60px}.mock-page .hero{padding-top:0}.mock-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin:25px 0}.card{background:var(--surface);border:1px solid var(--line);border-radius:9px;padding:26px;min-width:0}.card h2{font-family:'Sarabun',sans-serif;font-size:23px;margin:11px 0}.card p{font-size:15px;color:var(--muted);line-height:1.95}.mock-spec{display:flex;gap:12px;flex-wrap:wrap;margin:19px 0;font-size:12px;color:var(--muted)}.note{font-size:13px;color:var(--muted);padding:14px 17px;background:var(--tint);border-radius:6px;margin:18px 0;line-height:1.9}.exam-top{display:flex;justify-content:space-between;align-items:center;gap:12px;font-size:12px;color:var(--muted);margin:15px 0}.clock{font:600 17px ui-monospace,monospace;color:var(--accent);background:var(--tint);padding:8px 13px;border-radius:5px}.bar{height:4px;background:var(--line);border-radius:6px;margin:15px 0 22px;overflow:hidden}.bar>i{height:100%;display:block;background:var(--accent)}.question h2{font:600 23px/1.9 'Sarabun',sans-serif;margin:20px 0}.question-head{display:flex;justify-content:space-between;align-items:center;gap:12px}.question-head .label{color:var(--accent)}.options{display:grid;gap:11px;margin:25px 0}.option{width:100%;display:flex;align-items:center;gap:13px;text-align:left;padding:13px 16px;background:var(--surface);border:1px solid var(--line);border-radius:6px;font-size:16px;line-height:1.9}.option.selected{background:var(--tint);border-color:var(--accent)}.option .letter{font:12px ui-monospace,monospace;border:1px solid var(--line);border-radius:4px;min-width:27px;height:27px;display:grid;place-items:center}.exam-controls{display:flex;gap:10px;justify-content:space-between;flex-wrap:wrap;margin-top:22px}.flagged{color:var(--gold)!important;border-color:var(--gold)!important}.question-map{display:flex;flex-wrap:wrap;gap:7px;margin-top:15px}.question-map button{width:34px;height:34px;font:11px ui-monospace,monospace;border:1px solid var(--line);background:var(--surface);border-radius:4px}.question-map button.answered{background:var(--tint);color:var(--accent)}.question-map button.current{outline:2px solid var(--accent)}.map-top{display:flex;justify-content:space-between;align-items:center;font-size:12px;color:var(--muted);gap:10px}.score{display:flex;align-items:center;gap:24px;margin:25px 0}.score-number{width:100px;height:100px;border-radius:50%;border:6px solid var(--tint);display:grid;place-items:center;font:600 27px ui-monospace,monospace;color:var(--accent);flex-shrink:0}.score h2{margin:0 0 7px}.score p{margin:0}.stats-grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:11px;margin:20px 0}.stat{padding:17px 13px;font-size:12px}.stat b{display:block;font-size:19px;color:var(--accent);margin:8px 0}.stat a{font-size:11px}.review-list details{border:1px solid var(--line);background:var(--surface);border-radius:6px;padding:15px 18px;margin:10px 0}.review-list summary{font-size:15px;line-height:1.9;cursor:pointer}.review-answer{padding-top:17px;font-size:15px;line-height:2}.review-answer p{margin:10px 0}.correct{color:var(--accent)}.incorrect{color:var(--red)}.answer-option{font-size:14px;margin:7px 0}.review-actions{display:flex;justify-content:space-between;align-items:center;margin:28px 0 17px;gap:13px}.review-actions h2{margin:0;font-size:23px}dialog{max-width:560px;width:calc(100% - 30px);border:1px solid var(--line);border-radius:10px;padding:27px;background:var(--surface);color:var(--ink)}dialog::backdrop{background:#14212e70;backdrop-filter:blur(3px)}dialog h2{font-size:24px;margin-top:0}dialog p{font-size:17px;line-height:2}dialog pre{white-space:pre-wrap;font-size:12px}#notice{position:fixed;bottom:20px;left:50%;transform:translateX(-50%);background:var(--accent);color:#fff;padding:9px 17px;border-radius:7px;opacity:0;pointer-events:none;z-index:40;font-size:13px}#notice.show{opacity:1}.dark{--paper:#17232c;--surface:#202f3a;--ink:#e4ecef;--muted:#aebdc6;--line:#3b4b56;--accent:#9acadd;--tint:#294552;--gold:#d7b574;--warm:#3a3326;--red:#e8ada3;--danger:#4b332e}.dark .codebox{background:#15242d;color:#bddce9}.dark .btn.primary{color:#17232c}.dark .theory-note{border-color:#695b40}.dark .search-hit.selected{color:#17232c}
@media(max-width:1150px){.layout{grid-template-columns:220px minmax(0,1fr)}.reading{padding-left:30px;padding-right:30px}header{padding:0 22px;gap:25px}.stats-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media(max-width:800px){.layout{grid-template-columns:minmax(0,1fr)}.toc{display:none}.mobile-toc{display:block;margin:21px 0;border:1px solid var(--line);padding:13px 17px;border-radius:6px;background:var(--surface)}.mobile-toc summary{font-size:14px;cursor:pointer;color:var(--accent)}.mobile-toc a{display:block;text-decoration:none;font-size:13px;padding:8px 0}.mock-grid{grid-template-columns:1fr}.reading{padding:0 28px 50px}h1{font-size:34px}.content>h2{font-size:27px}.tools{gap:5px}header{gap:22px}}
@media(max-width:520px){:root{--read-size:17px}header{height:66px;padding:0 15px;gap:13px}.brand{font-size:18px}.brand span{display:none}header nav{gap:5px}header nav a{font-size:14px;padding:0 10px}.tools button{width:27px;height:29px;font-size:10px}.tools{gap:4px}.reading{padding:0 19px 45px}.hero{padding-top:28px}h1{font-size:29px;line-height:1.55}.hero .lead{font-size:15px}.content>h2{font-size:24px;margin-top:22px;padding-top:26px}.content>h3{font-size:20px}.content p,.content li{line-height:2.05}.codebox{font-size:11px;padding:16px}.theory-note{padding:17px}.mock-page{padding:25px 18px 45px}.card{padding:21px 18px}.question h2{font-size:20px}.option{font-size:15px;padding:11px 13px}.stats-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.clock{font-size:14px}.score{gap:15px}.score-number{width:80px;height:80px;font-size:23px}.score h2{font-size:22px}.review-list summary{font-size:14px}.review-list details{padding:13px 15px}.btn{font-size:12px}.reading-progress{top:63px}.review-actions{align-items:flex-start}html{scroll-padding-top:80px}}
@media print{header,.toc,.mobile-toc,.btns,.reading-progress,.to-top,.tools,#notice{display:none!important}.layout{display:block}.reading{padding:0}.hero{padding-top:0}.content p,.content li{font-size:11pt;line-height:1.7}.content h2{font-size:19pt;break-after:avoid}.content h3{font-size:15pt;break-after:avoid}.content .table-scroll{overflow:visible}.data-table{min-width:0;font-size:9pt}.data-table th,.data-table td{padding:7px;min-width:0}.codebox{white-space:pre-wrap;font-size:9pt;break-inside:avoid}.theory-note{break-inside:avoid}body{background:white;color:#111}.glossary details p{display:block}.footer{font-size:9pt}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}

.study-plan{margin:22px 0}.study-plan h2{margin:8px 0}.study-plan li{margin-bottom:14px}.study-plan a{font-weight:700;text-decoration:underline;text-underline-offset:4px}.study-plan p{line-height:1.9}.brand span{letter-spacing:.08em}@media(max-width:600px){.brand span{display:none}}
.course-back{display:inline-block;margin-bottom:20px;font-size:13px;text-decoration:none}.all-courses{display:block;margin:20px 0;font-size:13px}.course-home{color:var(--muted);font-size:14px;text-decoration:none}header .brand span{max-width:160px;display:inline-block;overflow:hidden;text-overflow:ellipsis;vertical-align:middle}
@media(max-width:600px){header .brand span{display:none}.course-home{display:none}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}