:root{
  --bg:#f6f1e7; --surface:#fffdf8; --ink:#2b281f; --muted:#6b6558; --line:#ded6c7;
  --accent:#7a4f19; --accent2:#a66a1f; --soft:#efe4ce; --green:#42624b; --danger:#8a3b2f;
  --shadow:0 14px 34px rgba(65,48,24,.10); --radius:20px; --max:1180px;
}
*{box-sizing:border-box} html{scroll-behavior:smooth}
body{margin:0;background:linear-gradient(180deg,#f8f4ec 0,#f4ede1 100%);color:var(--ink);
  font-family:system-ui,-apple-system,"Segoe UI","Noto Sans Thai",Tahoma,sans-serif;line-height:1.65}
button,input,select,textarea{font:inherit}
button{cursor:pointer}
button:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible,a:focus-visible{
  outline:3px solid rgba(166,106,31,.28);outline-offset:2px}
.skip-link{position:absolute;left:-9999px}.skip-link:focus{left:12px;top:12px;z-index:99;background:white;padding:8px 12px}
.topbar{position:sticky;top:0;z-index:30;display:flex;align-items:center;gap:20px;padding:10px max(18px,calc((100vw - var(--max))/2));
  background:rgba(255,253,248,.94);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.brand{border:0;background:transparent;display:flex;align-items:center;gap:10px;text-align:left;color:var(--ink);padding:4px}
.brand-mark{display:grid;place-items:center;width:42px;height:42px;border-radius:50%;background:var(--accent);color:white;font-family:Georgia,serif;font-size:23px}
.brand strong{display:block;font-size:16px}.brand small{display:block;color:var(--muted);font-size:11px}
.nav{display:flex;gap:4px;margin-left:auto}.nav button,.mobile-nav button,.footer button{
  border:0;background:transparent;padding:9px 10px;border-radius:10px;color:var(--ink)}
.nav button:hover,.mobile-nav button:hover,.footer button:hover{background:var(--soft)}
.menu-btn{display:none;margin-left:auto;border:1px solid var(--line);background:white;border-radius:10px;padding:7px 11px}
.mobile-nav{position:sticky;top:63px;z-index:28;background:white;border-bottom:1px solid var(--line);padding:8px 16px}
.mobile-nav button{display:block;width:100%;text-align:left}
main{min-height:calc(100vh - 140px)}
.shell{width:min(var(--max),calc(100% - 32px));margin:0 auto;padding:34px 0 56px}
.hero{display:grid;grid-template-columns:1.15fr .85fr;gap:26px;align-items:stretch}
.hero-main,.hero-side,.panel,.card,.reader-card,.topic-card,.path-card,.result-card,.stat{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
.hero-main{padding:42px}.hero-side{padding:26px}
.eyebrow{color:var(--accent);font-weight:700;letter-spacing:.02em;font-size:13px}
h1,h2,h3{line-height:1.25;margin:0 0 12px}h1{font-size:clamp(34px,5vw,62px);font-family:Georgia,"Noto Serif Thai",serif;font-weight:650}
h2{font-size:clamp(25px,3vw,38px)}h3{font-size:20px}
.lead{font-size:18px;color:#4c473d;max-width:780px}
.actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:22px}
.btn{border:1px solid var(--line);background:white;color:var(--ink);padding:11px 16px;border-radius:12px;font-weight:650}
.btn.primary{background:var(--accent);border-color:var(--accent);color:white}.btn.soft{background:var(--soft);border-color:transparent}
.btn.ghost{background:transparent}.btn.small{padding:7px 10px;font-size:13px}
.btn:hover{transform:translateY(-1px)}
.notice{border-left:4px solid var(--accent2);background:#fff8ea;padding:14px 16px;border-radius:10px;color:#514737}
.notice.green{border-color:var(--green);background:#f1f6f2}.notice.danger{border-color:var(--danger);background:#fbefed}
.route-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:26px}
.route-card{border:1px solid var(--line);background:white;border-radius:16px;padding:18px;text-align:left;min-height:150px}
.route-card:hover{border-color:#c5aa82;box-shadow:0 8px 18px rgba(65,48,24,.08)}
.route-card .icon{font-size:25px}.route-card p{color:var(--muted);margin:8px 0 0;font-size:14px}
.kicker{font-size:12px;font-weight:800;color:var(--accent);text-transform:uppercase;letter-spacing:.06em}
.side-list{display:grid;gap:10px;margin-top:16px}.side-item{padding:13px;border-radius:12px;background:#f8f3e9;border:1px solid #e8ddca}
.side-item b{display:block}.side-item small{color:var(--muted)}
.section-head{display:flex;justify-content:space-between;align-items:end;gap:18px;margin:6px 0 22px}.section-head p{margin:0;color:var(--muted);max-width:720px}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.grid.two{grid-template-columns:repeat(2,1fr)}
.card,.topic-card,.path-card,.result-card,.panel{padding:22px}.card p,.topic-card p,.path-card p,.result-card p{color:var(--muted)}
.tag-row{display:flex;gap:6px;flex-wrap:wrap}.tag{display:inline-flex;align-items:center;border-radius:999px;background:var(--soft);padding:4px 9px;font-size:12px;color:#594524}
.tag.green{background:#e8f0ea;color:#35503c}.tag.gray{background:#efefec;color:#666}
.meta{display:flex;gap:10px;flex-wrap:wrap;color:var(--muted);font-size:13px}
.searchbar{display:flex;gap:8px;background:white;border:1px solid var(--line);padding:8px;border-radius:15px;box-shadow:var(--shadow)}
.searchbar input{flex:1;border:0;background:transparent;padding:8px 10px;min-width:0}.searchbar input:focus{outline:none}
.filters{display:flex;gap:8px;flex-wrap:wrap;margin:16px 0}.filter{border:1px solid var(--line);background:white;border-radius:999px;padding:7px 12px}
.filter.active{background:var(--accent);color:white;border-color:var(--accent)}
.topic-card,.path-card{position:relative}.topic-card button,.path-card button{margin-top:12px}
.level{position:absolute;right:18px;top:18px;width:32px;height:32px;border-radius:50%;display:grid;place-items:center;background:var(--soft);font-weight:800;color:var(--accent)}
.path-flow{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.path-step{background:white;border:1px solid var(--line);border-radius:14px;padding:16px;position:relative}
.path-step:not(:last-child)::after{content:"→";position:absolute;right:-16px;top:44%;z-index:2;color:#a68d69;font-size:20px}
.progressbar{height:9px;background:#e8e1d5;border-radius:99px;overflow:hidden}.progressbar span{display:block;height:100%;background:var(--accent)}
.ask-box{padding:24px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
.ask-box textarea{width:100%;min-height:112px;border:1px solid var(--line);border-radius:12px;padding:14px;background:#fff}
.example-chips{display:flex;gap:8px;flex-wrap:wrap;margin:10px 0}.chip{border:1px solid var(--line);background:white;border-radius:999px;padding:7px 11px;font-size:13px}
.result-card{margin-top:12px}.score{font-weight:800;color:var(--green)}
.reader-layout{display:grid;grid-template-columns:280px 1fr;gap:18px}.reader-side{position:sticky;top:88px;align-self:start}
.reader-side .panel{box-shadow:none}.reader-main{min-width:0}
.reader-toolbar{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-bottom:14px}
.mode-tabs{display:flex;gap:5px;flex-wrap:wrap}.mode-tabs button{border:1px solid var(--line);background:white;border-radius:10px;padding:8px 11px}
.mode-tabs button.active{background:var(--ink);color:white;border-color:var(--ink)}
.reader-card{padding:28px;margin-bottom:14px}.reader-card .segment-id{font-size:12px;color:var(--muted);font-family:ui-monospace,monospace}
.lang-label{font-size:12px;font-weight:800;color:var(--accent);letter-spacing:.05em;text-transform:uppercase;margin-bottom:5px}
.pali{font-family:Georgia,"Noto Serif",serif;font-size:20px}.english{font-size:18px}.thai{font-size:18px}
.segment{padding:16px 0;border-bottom:1px dashed #ded6c7}.segment:last-child{border-bottom:0}
.segment-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}.segment-grid.three{grid-template-columns:1fr 1fr 1fr}
.click-speak{cursor:pointer;border-radius:9px;padding:4px;margin:-4px}.click-speak:hover{background:#f4ead8}
.source-box{background:#f3f0e8;border:1px solid var(--line);padding:14px;border-radius:12px;font-size:13px}
.glossary{display:grid;gap:8px}.gloss-item{border:1px solid var(--line);border-radius:12px;padding:12px;background:white}
.gloss-item summary{cursor:pointer;font-weight:750}
.prereq{display:flex;gap:8px;flex-wrap:wrap}.prereq button{border:1px dashed #b99b70;background:#fffaf0;border-radius:10px;padding:8px 10px}
.knowledge-map{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.km-node{border:1px solid var(--line);background:white;padding:9px 12px;border-radius:11px}
.km-node.main{background:var(--accent);color:white;border-color:var(--accent)}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.stat{padding:18px}.stat strong{font-size:30px;display:block}
.bookmark{border:0;background:transparent;font-size:20px;padding:4px 8px}.bookmark.active{color:#a25f00}
.empty{padding:34px;text-align:center;color:var(--muted);border:1px dashed var(--line);border-radius:15px}
.footer{display:flex;justify-content:space-between;gap:20px;align-items:center;padding:20px max(18px,calc((100vw - var(--max))/2));border-top:1px solid var(--line);background:#efe7d9;color:#5d5547}
.footer span{display:block;font-size:12px}.footer button{white-space:nowrap}
hr{border:0;border-top:1px solid var(--line);margin:24px 0}
ul.clean{padding-left:20px} .muted{color:var(--muted)} .danger-text{color:var(--danger)} .ok{color:var(--green)}
@media(max-width:900px){
  .nav{display:none}.menu-btn{display:block}.hero{grid-template-columns:1fr}.route-grid,.grid{grid-template-columns:repeat(2,1fr)}
  .path-flow{grid-template-columns:1fr 1fr}.path-step::after{display:none}.reader-layout{grid-template-columns:1fr}.reader-side{position:static}
  .segment-grid.three{grid-template-columns:1fr}.stats{grid-template-columns:1fr 1fr}
}
@media(max-width:600px){
  .shell{width:min(100% - 20px, var(--max));padding-top:22px}.hero-main{padding:26px}.route-grid,.grid,.grid.two{grid-template-columns:1fr}
  .path-flow{grid-template-columns:1fr}.segment-grid{grid-template-columns:1fr}.stats{grid-template-columns:1fr 1fr}
  .reader-card{padding:19px}.footer{align-items:flex-start;flex-direction:column}
}