/* Thư viện ebook thầy Tường · Teachera
   Khung A (phòng đọc) + hero B (trích dẫn, chân dung vòm) */

:root{
  --navy:#013244;--deep:#015A62;--green:#00AA80;--mint:#13E6A4;--pale:#65F0C1;--mist:#EDF4F3;--ice:#E5F9F4;
  --bg:#F6F9F8;--fg:#0E2A33;--muted:#557079;--line:#D5E2E0;--panel:#fff;--accent:#00AA80;--chip:#E3EFEC;
  --accent-ink:#007F60;--shadow:0 1px 2px rgba(1,50,68,.06),0 8px 24px rgba(1,50,68,.06);
  --head:"Lexend",system-ui,sans-serif;--body:"Be Vietnam Pro",system-ui,sans-serif;--serif:"Newsreader",Georgia,serif;
  --gut:max(16px,env(safe-area-inset-left));--gutr:max(16px,env(safe-area-inset-right));
  --fs:18px;
  color-scheme:light;
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]):not([data-theme="paper"]){
    --bg:#071A21;--fg:#E4F0EE;--muted:#8FA9AF;--line:#1E3A43;--panel:#0C252E;--accent:#13E6A4;--chip:#12313A;
    --accent-ink:#13E6A4;--shadow:0 1px 2px rgba(0,0,0,.3);color-scheme:dark;
  }
}
:root[data-theme="dark"]{
  --bg:#071A21;--fg:#E4F0EE;--muted:#8FA9AF;--line:#1E3A43;--panel:#0C252E;--accent:#13E6A4;--chip:#12313A;
  --accent-ink:#13E6A4;--shadow:0 1px 2px rgba(0,0,0,.3);color-scheme:dark;
}
:root[data-theme="paper"]{
  --bg:#F7F4EC;--fg:#13252C;--muted:#5E6B66;--line:#E2DCCB;--panel:#FCFAF4;--chip:#EEE8D8;--accent:#00AA80;--accent-ink:#00745A;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:80px}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.6 var(--body);-webkit-font-smoothing:antialiased;overflow-x:hidden}
img{max-width:100%;display:block}
a{color:inherit}
h1,h2,h3,h4{font-family:var(--head);font-weight:600;line-height:1.25;margin:0 0 .5em;letter-spacing:-.01em;text-wrap:balance}
p{margin:0 0 1em}
button{font:inherit;color:inherit;cursor:pointer}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px}
[hidden]{display:none!important}

.wrap{max-width:1160px;margin:0 auto;padding-left:var(--gut);padding-right:var(--gutr)}
.eyebrow{font:600 12px/1.4 var(--head);letter-spacing:.12em;text-transform:uppercase;color:var(--accent-ink);margin-bottom:10px}
.sec-h{font-size:clamp(24px,3vw,32px);margin-bottom:20px}
.lead{font-size:18px;color:var(--muted);max-width:60ch}
.facts{display:flex;flex-wrap:wrap;gap:6px 16px;font-size:14px;color:var(--muted);margin:12px 0 0}
.facts span+span::before{content:"·";margin-right:16px;color:var(--line)}
.cta-row{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin-top:20px}
.lnk{color:var(--accent-ink);font-weight:600;text-decoration:none;font-size:15px}
.lnk:hover{text-decoration:underline}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:44px;padding:10px 20px;border-radius:999px;
  background:var(--navy);color:#fff;font:600 15px/1.2 var(--head);text-decoration:none;border:1.5px solid transparent;transition:transform .15s,background .15s}
.btn:hover{background:var(--deep);transform:translateY(-1px)}
.btn-sm{min-height:36px;padding:7px 14px;font-size:14px}
.btn.ghost{background:transparent;color:var(--fg);border-color:var(--line)}
.btn.ghost:hover{border-color:var(--accent);background:var(--chip)}
.btn.mint{background:var(--mint);color:var(--navy)}
.btn.mint:hover{background:var(--pale)}
.btn.ghost-l{background:transparent;color:#fff;border-color:rgba(255,255,255,.35)}
.btn.ghost-l:hover{border-color:var(--mint)}
:root[data-theme="dark"] .btn:not(.ghost):not(.mint):not(.ghost-l){background:var(--mint);color:var(--navy)}
@media (prefers-color-scheme:dark){:root:not([data-theme]) .btn:not(.ghost):not(.mint):not(.ghost-l){background:var(--mint);color:var(--navy)}}

/* nav */
.nav{position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav-in{display:flex;align-items:center;gap:20px;height:64px}
.brand{display:flex;align-items:baseline;gap:10px;text-decoration:none}
.wm{font:700 22px/1 var(--head);letter-spacing:-.02em}
.wm b{color:var(--green);font-weight:700}
.brand-sub{font-size:13px;color:var(--muted)}
.nav-links{display:flex;gap:4px;margin-left:auto}
.nav-links a{padding:8px 12px;border-radius:8px;text-decoration:none;font-size:15px;color:var(--muted)}
.nav-links a:hover,.nav-links a[aria-current]{color:var(--fg);background:var(--chip)}
@media (max-width:760px){
  .brand-sub{display:none}
  .nav-links a[href$="#tac-gia"]{display:none}
  .nav-in{gap:8px}.nav-links a{padding:8px}
  .nav .btn-sm{padding:7px 12px}
}
@media (max-width:420px){.nav-links a[href$="#sach"]{display:none}}

/* hub hero (B) */
.hero{padding:56px 0 40px;background:radial-gradient(ellipse at 85% 0%,color-mix(in srgb,var(--mint) 18%,transparent),transparent 60%)}
.hero-in{display:grid;grid-template-columns:1.25fr .75fr;gap:56px;align-items:center}
.hq{margin:8px 0 24px;padding:0}
.hq p{font:italic 400 clamp(28px,3.6vw,44px)/1.25 var(--serif);letter-spacing:-.01em;margin:0;text-wrap:pretty}
.hq p::before{content:"“";color:var(--accent);margin-right:2px}
.hq p::after{content:"”";color:var(--accent)}
.sig{display:inline-flex;align-items:center;gap:12px;text-decoration:none;margin-bottom:24px}
.sig img{width:40px;height:40px;border-radius:50%;object-fit:cover;object-position:50% 8%;background:linear-gradient(170deg,#65F0C1,#00AA80 55%,#015A62)}
.sig b{display:block;font:600 15px/1.3 var(--head)}
.sig small{color:var(--muted);font-size:13px}
.sig:hover small{color:var(--accent-ink)}
.hero-pic{position:relative;max-width:380px;justify-self:end;width:100%}
.arch{border-radius:200px 200px 16px 16px;aspect-ratio:3/4;overflow:hidden;background:linear-gradient(170deg,#65F0C1,#00AA80 55%,#015A62)}
.arch img{width:100%;height:100%;object-fit:cover;object-position:50% 8%}
.arch-tag{position:absolute;left:-28px;bottom:28px;background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:12px 16px;
  font-size:13px;line-height:1.5;box-shadow:var(--shadow);color:var(--muted)}
.arch-tag b{color:var(--fg);font-family:var(--head)}
@media (max-width:860px){
  .hero{padding:32px 0}
  .hero-in{grid-template-columns:1fr;gap:28px}
  .hero-pic{order:-1;max-width:220px;justify-self:start}
  .arch-tag{left:auto;right:-150px;bottom:16px}
}
@media (max-width:480px){.arch-tag{display:none}.hero-pic{max-width:180px}}

.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:16px;overflow:hidden;margin-bottom:64px;padding:0}
.stats>div{background:var(--panel);padding:20px}
.stats b{display:block;font:600 26px/1.2 var(--head)}
.stats span{font-size:14px;color:var(--muted)}
.stats.wrap{max-width:calc(1160px - 32px);margin-left:auto;margin-right:auto}
@media (max-width:1192px){.stats.wrap{margin-left:16px;margin-right:16px}}
@media (max-width:640px){.stats{grid-template-columns:1fr 1fr}.stats b{font-size:22px}}

/* shelf */
.shelf{padding-bottom:72px}
.shelf-head{display:flex;flex-wrap:wrap;align-items:end;justify-content:space-between;gap:12px;margin-bottom:8px}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:20px}
.chip{border:1px solid var(--line);background:transparent;border-radius:999px;padding:7px 14px;font-size:14px;min-height:36px}
.chip:hover{border-color:var(--accent)}
.chip.on{background:var(--fg);color:var(--bg);border-color:var(--fg)}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
@media (max-width:960px){.grid{grid-template-columns:1fr 1fr}}
@media (max-width:620px){.grid{grid-template-columns:1fr}}
.card{background:var(--panel);border:1px solid var(--line);border-radius:18px;overflow:hidden;display:flex;flex-direction:column;transition:transform .2s,box-shadow .2s}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.card .cover{border-radius:0}
.card-b{padding:20px;display:flex;flex-direction:column;flex:1}
.card-b h3{font-size:20px;margin-bottom:8px}
.card-b h3 a{text-decoration:none}
.card-b h3 a:hover{color:var(--accent-ink)}
.card-b p{color:var(--muted);font-size:15px;margin:0}
.card-b .cta-row{margin-top:auto;padding-top:18px}

/* covers */
.cover{position:relative;aspect-ratio:4/3;padding:22px;display:flex;flex-direction:column;justify-content:flex-end;color:#fff;overflow:hidden;border-radius:14px;isolation:isolate}
.cover.lg{aspect-ratio:3/4;width:100%;max-width:300px;border-radius:16px;box-shadow:0 20px 50px rgba(1,50,68,.25)}
.cv-top{position:absolute;top:18px;left:22px;font:600 11px/1 var(--head);letter-spacing:.14em;text-transform:uppercase;opacity:.8}
.cv-title{font:500 italic clamp(22px,2.4vw,28px)/1.15 var(--serif);max-width:14ch;text-wrap:balance}
.cover.lg .cv-title{font-size:32px}
.cv-au{font-size:13px;opacity:.85;margin-top:10px}
.c-tl{background:linear-gradient(160deg,#015A62,#013244 70%)}
.c-tl::before{content:"";position:absolute;right:-30%;top:-20%;width:90%;aspect-ratio:1;border-radius:50%;background:radial-gradient(circle,#13E6A4 0,transparent 65%);opacity:.45;z-index:-1}
.c-disc{background:#0E2A33}
.disc4{position:absolute;top:44px;right:22px;display:grid;grid-template-columns:1fr 1fr;gap:6px}
.disc4 i{width:30px;height:30px;border-radius:8px;display:grid;place-items:center;font:700 14px/1 var(--head);font-style:normal;color:#0E2A33}
.disc4 i:nth-child(1){background:#E8574A;color:#fff}.disc4 i:nth-child(2){background:#F4C243}
.disc4 i:nth-child(3){background:#13E6A4}.disc4 i:nth-child(4){background:#5BA4E6}
.cover.lg .disc4 i{width:40px;height:40px;font-size:17px}
.c-cs{background:linear-gradient(200deg,#00AA80,#015A62 80%)}
.c-cs::before{content:"";position:absolute;inset:auto -20% -40% auto;width:80%;aspect-ratio:1;border-radius:50%;border:28px solid rgba(255,255,255,.12);z-index:-1}

.c-hr{background:linear-gradient(165deg,#8A4A1F,#2B1810 78%)}
.c-hr::before{content:"";position:absolute;right:-18%;top:-14%;width:70%;aspect-ratio:1;border-radius:50%;background:radial-gradient(circle,#F4B26A 0,transparent 66%);opacity:.38;z-index:-1}

/* author */
.author{display:grid;grid-template-columns:.9fr 1.1fr;gap:48px;align-items:center;padding-top:16px;padding-bottom:80px}
.au-txt h2{font-size:clamp(26px,3vw,34px)}
.au-txt p{color:var(--muted);font-size:17px;max-width:60ch}
.creds{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:1fr 1fr;gap:12px}
.creds li:first-child{grid-column:1/-1}
.creds li{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:14px 16px;font-size:14px;color:var(--muted)}
.creds b{display:block;font:600 20px/1.3 var(--head);color:var(--fg)}
@media (max-width:760px){.author{grid-template-columns:1fr;gap:24px}}

/* learn block */
.learn{background:var(--navy);color:#E4F0EE;padding:72px 0}
.learn .eyebrow{color:var(--mint)}
.learn h2{color:#fff;font-size:clamp(26px,3vw,34px)}
.learn p{color:#A9C3C7}
.learn-in{display:grid;grid-template-columns:1fr 1.1fr;gap:48px;align-items:start}
@media (max-width:860px){.learn-in{grid-template-columns:1fr;gap:28px}.learn{padding:48px 0}}
.rows{display:flex;flex-direction:column;border-top:1px solid rgba(255,255,255,.12)}
.row{display:grid;grid-template-columns:1fr auto;gap:2px 16px;padding:16px 4px;border-bottom:1px solid rgba(255,255,255,.12);text-decoration:none;transition:padding .15s}
.row b{font:600 17px/1.35 var(--head);color:#fff}
.row span{grid-column:1;font-size:14px;color:#A9C3C7}
.row i{grid-column:2;grid-row:1/3;align-self:center;font-style:normal;color:var(--mint);font-size:20px}
.row:hover{padding-left:12px}
.row:hover b{color:var(--mint)}

/* footer */
.foot{border-top:1px solid var(--line);padding:48px 0 24px;font-size:14px;color:var(--muted)}
.foot-in{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:32px}
.foot h4{font-size:14px;color:var(--fg);margin-bottom:8px}
.foot .wm{font-size:20px;color:var(--fg);display:inline-block;margin-bottom:10px}
.foot a{color:var(--muted)}.foot a:hover{color:var(--accent-ink)}
.foot-copy{margin-top:32px;font-size:13px}
.foot-copy::before{content:"";display:block;border-top:1px solid var(--line);margin-bottom:16px}
@media (max-width:720px){.foot-in{grid-template-columns:1fr;gap:20px}}

/* book landing */
.bk-hero{padding:48px 0;background:linear-gradient(180deg,var(--chip),var(--bg))}
.bk-in{display:grid;grid-template-columns:300px 1fr;gap:48px;align-items:center}
.bk-meta h1{font-size:clamp(30px,4.2vw,46px);margin-bottom:6px}
.bk-meta .sub{font:italic 400 20px/1.4 var(--serif);color:var(--muted);margin-bottom:14px}
@media (max-width:760px){.bk-in{grid-template-columns:1fr;gap:24px}.cover.lg{max-width:200px}.bk-hero{padding:28px 0}}
.bk-body{display:grid;grid-template-columns:1fr 320px;gap:48px;padding-top:40px;padding-bottom:72px;align-items:start}
.bk-main .callout{margin-bottom:40px}
.bk-side{position:sticky;top:84px}
@media (max-width:900px){.bk-body{grid-template-columns:1fr}.bk-side{position:static}}

/* toc */
.toc-part{font:600 12px/1.4 var(--head);letter-spacing:.1em;text-transform:uppercase;color:var(--accent-ink);margin:28px 0 8px}
.toc-part:first-child{margin-top:0}
.toc{list-style:none;margin:0;padding:0;border-top:1px solid var(--line)}
.toc li{border-bottom:1px solid var(--line)}
.toc a{display:grid;grid-template-columns:auto 1fr auto;gap:4px 14px;align-items:baseline;padding:12px 4px;text-decoration:none}
.toc .k{font-size:12px;color:var(--muted);min-width:64px;font-family:var(--head)}
.toc .t{font-weight:500}
.toc .m{font-size:12px;color:var(--muted);white-space:nowrap}
.toc a:hover .t{color:var(--accent-ink)}
.toc li.on a{background:var(--chip);border-radius:8px}
.toc li.on .t{color:var(--accent-ink);font-weight:600}
@media (max-width:520px){.toc a{grid-template-columns:1fr auto}.toc .k{grid-column:1/-1;min-width:0}}

/* cta card */
.cta-card{background:var(--navy);color:#E4F0EE;border-radius:18px;padding:24px;position:relative;overflow:hidden}
.cta-card::after{content:"";position:absolute;right:-60px;top:-60px;width:180px;height:180px;border-radius:50%;background:radial-gradient(circle,rgba(19,230,164,.35),transparent 70%)}
.cta-eyebrow{font:600 12px/1.4 var(--head);letter-spacing:.12em;text-transform:uppercase;color:var(--mint);margin-bottom:8px}
.cta-card h3{color:#fff;font-size:20px}
.cta-card p{color:#A9C3C7;font-size:15px}
.cta-card .btn{background:var(--mint);color:var(--navy)}
.cta-card .btn.ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.3)}
.cta-card .lnk{color:var(--mint);flex-basis:100%}
.cta-card .cta-row{margin-top:12px}

/* reader */
.progress{position:fixed;top:0;left:0;right:0;height:3px;z-index:40}
.progress i{display:block;height:100%;width:0;background:var(--accent);transition:width .1s linear}
.rbar{position:sticky;top:0;z-index:30;background:color-mix(in srgb,var(--bg) 90%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.rbar-in{display:flex;align-items:center;gap:12px;height:56px;padding:0 var(--gutr) 0 var(--gut)}
.ico{width:40px;height:40px;border-radius:10px;border:1px solid var(--line);background:var(--panel);font-size:18px;display:grid;place-items:center;flex:none}
.rb-book{font:600 15px/1.2 var(--head);text-decoration:none;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;min-width:0;flex:1}
.rb-tools{display:flex;gap:4px;flex:none}
.rb-tools button{width:36px;height:36px;border-radius:8px;border:1px solid var(--line);background:#fff;color:#0E2A33;font:600 14px/1 var(--head);padding:0}
.rb-tools .paper{background:#F7F4EC;color:#13252C}
.rb-tools .dark{background:#071A21;color:#E4F0EE;border-color:#1E3A43}
.rb-tools #fsDown,.rb-tools #fsUp{background:transparent;color:var(--fg)}
.rb-tools button[aria-pressed="true"]{outline:2px solid var(--accent);outline-offset:1px}
.rb-home{text-decoration:none;flex:none}
.rb-home .wm{font-size:18px}
@media (max-width:640px){.rb-home{display:none}.rb-tools{gap:2px}.rb-tools button{width:32px;height:32px;font-size:13px}.rbar-in{gap:8px}}
@media (max-width:380px){.rb-tools .paper{display:none}}

.rlayout{display:grid;grid-template-columns:300px minmax(0,1fr);max-width:1240px;margin:0 auto}
.rtoc{position:sticky;top:56px;height:calc(100vh - 56px);overflow:auto;padding:24px 20px 40px var(--gut);border-right:1px solid var(--line);font-size:14px;overscroll-behavior:contain}
.rtoc-head a{font:600 15px/1.3 var(--head);text-decoration:none;display:block;margin-bottom:18px}
.rtoc .toc a{grid-template-columns:1fr;gap:0;padding:9px 8px}
.rtoc .toc .k{font-size:11px;min-width:0}
.rtoc .toc .m{display:none}
.rtoc .toc-part{margin-top:20px;font-size:11px}
.reader{padding:48px var(--gutr) 80px var(--gut);min-width:0}
.reader>article,.reader>.cta-card,.reader>.pn{max-width:680px;margin-left:auto;margin-right:auto}
@media (max-width:1000px){
  .rlayout{grid-template-columns:1fr}
  .rtoc{position:fixed;top:0;left:0;bottom:0;height:auto;width:min(340px,86vw);z-index:50;background:var(--bg);transform:translateX(-102%);
    transition:transform .25s ease;padding-top:max(24px,env(safe-area-inset-top));box-shadow:none}
  body.toc-open .rtoc{transform:none;box-shadow:0 0 40px rgba(0,0,0,.25)}
  .scrim{position:fixed;inset:0;background:rgba(1,26,33,.45);z-index:45;opacity:0;pointer-events:none;transition:opacity .25s}
  body.toc-open .scrim{opacity:1;pointer-events:auto}
  body.toc-open{overflow:hidden}
  .reader{padding-top:32px}
}
@media (min-width:1001px){.ico{display:none}.scrim{display:none}}

.ch-head{margin-bottom:36px;padding-bottom:24px;border-bottom:1px solid var(--line)}
.ch-head h1{font-size:clamp(28px,4vw,40px);margin-bottom:12px}
.ch-meta{font-size:14px;color:var(--muted)}

.prose{font-size:var(--fs);line-height:1.8;font-family:var(--body)}
.prose p{margin:0 0 1.1em}
.prose h2{font-size:1.45em;margin:2em 0 .7em}
.prose h3{font-size:1.15em;margin:1.8em 0 .6em}
.prose h4{font-size:1em;margin:1.5em 0 .5em}
.prose>:first-child{margin-top:0}
.prose ul,.prose ol{padding-left:1.4em;margin:0 0 1.2em}
.prose li{margin:.35em 0}
.prose li::marker{color:var(--accent)}
.prose strong{font-weight:600}
.prose a{color:var(--accent-ink)}
.prose em{font-style:italic}

/* callouts */
.callout{--c:var(--accent);background:var(--panel);border:1px solid var(--line);border-left:4px solid var(--c);border-radius:4px 14px 14px 4px;
  padding:18px 20px;margin:1.6em 0;font-size:.94em;line-height:1.7}
.callout p:last-child,.callout ul:last-child{margin-bottom:0}
.co-label{font:600 12px/1.4 var(--head);letter-spacing:.1em;text-transform:uppercase;color:var(--c);margin-bottom:8px}
.callout.script{--c:#0E8FA0;background:color-mix(in srgb,#0E8FA0 6%,var(--panel))}
.callout.script p{font-family:var(--serif);font-style:italic;font-size:1.06em}
.callout.key{--c:var(--accent);background:color-mix(in srgb,var(--mint) 9%,var(--panel))}
.callout.case{--c:#5BA4E6}
.callout.theory{--c:#7A6FD0}
.callout.warn{--c:#E0A21B;background:color-mix(in srgb,#F4C243 9%,var(--panel))}
.callout.quote{--c:var(--deep);border-left-width:0;border-radius:14px;text-align:center;padding:24px}
.callout.quote p{font:italic 400 1.2em/1.5 var(--serif)}
.callout.note{--c:var(--muted)}
:root[data-theme="dark"] .callout.quote{--c:var(--mint)}

/* tables */
.tbl{overflow-x:auto;margin:1.4em 0;border:1px solid var(--line);border-radius:12px;-webkit-overflow-scrolling:touch;background:linear-gradient(to right,var(--bg) 30%,transparent) left/40px 100% no-repeat local,linear-gradient(to left,var(--bg) 30%,transparent) right/40px 100% no-repeat local,radial-gradient(farthest-side at 0 50%,rgba(0,0,0,.2),transparent) left/12px 100% no-repeat scroll,radial-gradient(farthest-side at 100% 50%,rgba(0,0,0,.2),transparent) right/12px 100% no-repeat scroll}
@media (max-width:600px){.tbl th,.tbl td{min-width:150px}}
.tbl table{border-collapse:collapse;width:100%;font-size:.88em;line-height:1.55}
.tbl th,.tbl td{padding:10px 14px;text-align:left;vertical-align:top;border-bottom:1px solid var(--line);min-width:120px}
.tbl th{background:var(--chip);font:600 .95em/1.4 var(--head)}
.tbl tr:last-child td{border-bottom:0}

/* prev / next */
.pn{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:32px}
.pn a{display:flex;flex-direction:column;gap:4px;padding:16px 18px;border:1px solid var(--line);border-radius:14px;text-decoration:none;background:var(--panel)}
.pn a:hover{border-color:var(--accent)}
.pn small{font-size:13px;color:var(--muted)}
.pn span{font:600 15px/1.35 var(--head)}
.pn .next{text-align:right}
.reader>.cta-card{margin-top:56px}
@media (max-width:520px){.pn{grid-template-columns:1fr}.pn .next{text-align:left}}

/* courses page */
.kh-hero{padding:56px 0 24px;background:radial-gradient(ellipse at 90% 0%,color-mix(in srgb,var(--mint) 18%,transparent),transparent 60%)}
.kh-hero h1{font-size:clamp(32px,4.6vw,52px)}
.kh-sec{padding-top:32px;padding-bottom:32px}
.sched{border-top:2px solid var(--fg)}
.srow{display:grid;grid-template-columns:110px 90px 1fr 140px auto;gap:16px;align-items:center;padding:18px 4px;border-bottom:1px solid var(--line);text-decoration:none;transition:background .15s}
.srow:hover{background:var(--chip)}
.sdate b{display:block;font:600 24px/1.1 var(--head)}
.sdate small,.sname small{color:var(--muted);font-size:13px}
.scode{font:600 13px/1 var(--head);letter-spacing:.06em;color:var(--accent-ink);background:var(--chip);border-radius:6px;padding:6px 8px;justify-self:start}
.sname b{display:block;font:600 17px/1.3 var(--head)}
.splace{font-size:14px;color:var(--muted)}
@media (max-width:760px){
  .srow{grid-template-columns:auto 1fr;gap:6px 14px}
  .sdate{grid-row:1/3}
  .scode{grid-column:2}
  .sname{grid-column:2}
  .splace{grid-column:2}
  .srow .btn{grid-column:2;justify-self:start;margin-top:4px}
}
.note{font-size:14px;color:var(--muted);margin-top:14px}
.perks{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.perks li{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:18px;font-size:15px;color:var(--muted)}
.perks b{display:block;font:600 17px/1.3 var(--head);color:var(--fg);margin-bottom:4px}
@media (max-width:860px){.perks{grid-template-columns:1fr 1fr}}
@media (max-width:520px){.perks{grid-template-columns:1fr}}
.cgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:16px}
.ccard{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:20px;text-decoration:none;display:flex;flex-direction:column}
.ccard h3{font-size:18px}
.ccard p{color:var(--muted);font-size:15px;flex:1}
.ccard:hover{border-color:var(--accent)}
.ws{background:var(--navy);color:#E4F0EE;border-radius:20px;padding:32px;display:flex;gap:24px;align-items:center;justify-content:space-between;flex-wrap:wrap;margin-bottom:48px}
.ws .eyebrow{color:var(--mint)}
.ws h2{color:#fff;font-size:clamp(22px,2.6vw,28px)}
.ws p{color:#A9C3C7;margin:0;max-width:56ch}

/* workshop page */
.ws-hero{background:var(--navy);color:#E4F0EE;padding:56px 0}
.ws-hero-in{display:grid;grid-template-columns:1.4fr 1fr;gap:40px;align-items:center}
.ws-hero .eyebrow{color:var(--mint)}
.ws-hero h1{color:#fff;font-size:clamp(32px,4.6vw,52px)}
.ws-hero .lead{color:#A9C3C7}
.ws-when{display:flex;flex-wrap:wrap;gap:10px;margin:22px 0}
.ws-when div{border:1px solid rgba(255,255,255,.18);border-radius:12px;padding:10px 16px}
.ws-when b{display:block;font:600 17px/1.2 var(--head);color:#fff}
.ws-when small{color:#A9C3C7;font-size:13px}
.ws-sp{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.14);border-radius:20px;padding:20px;display:grid;grid-template-columns:96px 1fr;gap:16px;align-items:start}
.ws-sp img{width:96px;height:96px;border-radius:50%;object-fit:cover;object-position:top;background:var(--deep)}
.ws-sp small{color:var(--mint);font:600 12px/1.4 var(--head);letter-spacing:.12em;text-transform:uppercase}
.ws-sp b{display:block;font:600 20px/1.3 var(--head);color:#fff;margin:2px 0 4px}
.ws-sp span{font-size:14px;color:#A9C3C7}
.ws-st{display:flex;gap:18px;margin-top:12px;font-size:13px;color:#A9C3C7}
.ws-st b{font-size:22px;color:var(--mint);margin:0}
.ws-pts{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.ws-pts li{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:18px;font-size:15px;color:var(--muted)}
.ws-pts span{font:600 13px/1 var(--head);color:var(--accent-ink);background:var(--chip);border-radius:6px;padding:5px 7px;display:inline-block;margin-bottom:10px}
.ws-pts b{display:block;font:600 17px/1.3 var(--head);color:var(--fg);margin-bottom:4px}
.tixs{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;align-items:stretch}
.tix{background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:24px;display:flex;flex-direction:column}
.tix.hot{border:2px solid var(--accent);box-shadow:var(--shadow)}
.tix-n{font:600 13px/1.4 var(--head);letter-spacing:.12em;text-transform:uppercase;color:var(--accent-ink)}
.tix-p{font:700 30px/1.2 var(--head);margin:4px 0 12px}
.tix-plus{font-size:14px;font-weight:600;margin:0 0 6px}
.tix ul{padding-left:18px;margin:0 0 20px;color:var(--muted);font-size:15px;flex:1}
.tix li{margin-bottom:6px}
.tix .btn{align-self:flex-start}
.ws-reg{display:grid;grid-template-columns:1fr 1.2fr;gap:40px;background:var(--chip);border-radius:20px;padding:32px;margin-bottom:48px}
.ws-reg h2{font-size:clamp(22px,2.6vw,28px)}
.ws-reg p{color:var(--muted)}
.ws-zalo{display:flex;align-items:center;justify-content:center}.ws-zalo .btn{font-size:17px;padding:16px 28px}
.ws-form{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.ws-form>label{display:flex;flex-direction:column;gap:6px;font-size:14px;font-weight:600}
.ws-form input:not([type=radio]){font:16px/1.4 var(--body);color:var(--fg);background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:11px 12px;min-height:44px}
.ws-form input:focus-visible{outline:2px solid var(--accent);outline-offset:1px}
.ws-form fieldset{grid-column:1/-1;border:0;padding:0;margin:0;display:flex;flex-wrap:wrap;gap:8px}
.ws-form legend{font-size:14px;font-weight:600;margin-bottom:6px;width:100%}
.opt{display:inline-flex;align-items:center;gap:8px;background:var(--bg);border:1px solid var(--line);border-radius:999px;padding:8px 14px;font-size:15px;cursor:pointer;min-height:40px}
.opt:has(input:checked){border-color:var(--accent);background:var(--panel)}
.opt input{accent-color:var(--green);margin:0}
.ws-form .btn{grid-column:1/-1;justify-self:start}
.ws-form .btn:disabled{opacity:.6;cursor:wait}
.ws-msg{grid-column:1/-1;margin:0;color:#B4433A;font-size:14px}
.ws-msg:empty{display:none}
.hp{position:absolute;left:-9999px;width:1px;height:1px;opacity:0}
.ws-done{align-self:center;background:var(--panel);border:1px solid var(--accent);border-radius:14px;padding:20px}
.pay-qr{display:grid;justify-items:center;gap:12px;background:var(--bg);border:1px solid var(--line);border-radius:16px;padding:20px}
.pay-qr img{width:min(300px,100%);height:auto}
.pay-qr dl{display:grid;grid-template-columns:auto 1fr;gap:4px 14px;margin:0;font-size:16px}.pay-qr dt{color:var(--muted)}.pay-qr dd{margin:0;font-weight:700}
.pay-wait{margin:0;color:var(--muted);font-size:14px}
.ws-done .btn{margin-top:12px}
@media (max-width:860px){.ws-hero-in,.ws-reg{grid-template-columns:1fr}.ws-pts,.tixs{grid-template-columns:1fr 1fr}}
@media (max-width:560px){.ws-pts,.tixs,.ws-form{grid-template-columns:1fr}.ws-reg{padding:20px}.ws-sp{grid-template-columns:72px 1fr}.ws-sp img{width:72px;height:72px}}

@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
@media print{.nav,.rbar,.rtoc,.progress,.cta-card,.pn,.foot,.scrim{display:none!important}.rlayout{display:block}.prose{font-size:12pt}}