/* Layout: 1200px column, sticky header, sections alternate paper/sand; single-page site with hash routes */
:root{
  --bg:#F7F4EC; --bg-alt:#EDE6D6; --bg-soft:#E3EEEA; --surface:#FFFFFF;
  --primary:#1F4E4A; --primary-2:#2E6B64; --ink:#13302D;
  --accent:#C8902E; --accent-text:#8A5F12; --accent-dark:#E0B25A;
  --fg:#22302E; --fg-2:#3D4A47; --sub:#5E6A66; --line:#DDD5C4; --line-2:#E5DED0;
  --warn:#A3382B; --on-ink:#D9E4E1; --on-primary:#FFFFFF;
  --f-body:"Noto Sans KR",system-ui,-apple-system,"Apple SD Gothic Neo","Malgun Gothic",sans-serif;
  --f-display:"Noto Serif KR","Nanum Myeongjo",Georgia,serif;
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){
  --bg:#111C1A; --bg-alt:#172623; --bg-soft:#1C3531; --surface:#16231F;
  --primary:#86C2B8; --primary-2:#A6D6CE; --ink:#0B1513;
  --accent:#D3A04A; --accent-text:#E0B25A; --accent-dark:#E0B25A;
  --fg:#E6EEEB; --fg-2:#C3D0CC; --sub:#9DAEA9; --line:#2B3E3A; --line-2:#24332F;
  --warn:#E7907F; --on-ink:#C9D8D3; --on-primary:#0E1A18; color-scheme:dark}}
:root[data-theme="dark"]{
  --bg:#111C1A; --bg-alt:#172623; --bg-soft:#1C3531; --surface:#16231F;
  --primary:#86C2B8; --primary-2:#A6D6CE; --ink:#0B1513;
  --accent:#D3A04A; --accent-text:#E0B25A; --accent-dark:#E0B25A;
  --fg:#E6EEEB; --fg-2:#C3D0CC; --sub:#9DAEA9; --line:#2B3E3A; --line-2:#24332F;
  --warn:#E7907F; --on-ink:#C9D8D3; --on-primary:#0E1A18; color-scheme:dark}

*{box-sizing:border-box}
html[lang="vi"],html[lang="en"]{--f-body:"Be Vietnam Pro","Noto Sans KR",system-ui,-apple-system,"Segoe UI",sans-serif;--f-display:"Noto Serif",Georgia,"Noto Serif KR",serif}
html[lang="vi"] body,html[lang="en"] body{word-break:normal}
body{background:var(--bg);color:var(--fg);font-family:var(--f-body);font-size:16px;line-height:1.7;word-break:keep-all;overflow-wrap:break-word}
a{color:var(--primary)} a:hover{color:var(--primary-2)}
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
h1,h2,h3{font-family:var(--f-display);text-wrap:balance;margin:0;line-height:1.35;color:var(--fg)}
h1{font-size:clamp(30px,5vw,44px)} h2{font-size:clamp(24px,3.4vw,30px)} h3{font-size:19px;font-family:var(--f-body)}
p{margin:0}
img{max-width:100%;display:block}
.wrap{max-width:1200px;margin:0 auto;padding-inline:24px}
@media (max-width:480px){.wrap{padding-inline:16px}}
.eyebrow{font-size:13px;font-weight:700;letter-spacing:.04em;color:var(--accent-text)}
.lead{font-size:17px;color:var(--fg-2);max-width:65ch}
.muted{color:var(--sub);font-size:14px}
.stack{display:flex;flex-direction:column;gap:12px}
.section{padding-block:64px}
.section.alt{background:var(--bg-alt)}
.section.soft{background:var(--bg-alt);border-block:1px solid var(--line-2)}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:0 24px;background:var(--primary);color:var(--on-primary);text-decoration:none;font-weight:700;border:1.5px solid var(--primary);font-family:inherit;font-size:15px;cursor:pointer}
.btn:hover{background:var(--primary-2);border-color:var(--primary-2);color:var(--on-primary)}
.btn.ghost{background:transparent;color:var(--primary)} .btn.ghost:hover{background:var(--bg-soft);color:var(--primary)}
.btn.sm{min-height:44px;padding:0 18px;font-size:14px}
.row{display:flex;flex-wrap:wrap;gap:16px}

/* header */
.site-head{position:sticky;top:env(safe-area-inset-top,0px);z-index:10;background:var(--bg);border-bottom:1px solid var(--line)}
.site-head .wrap{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;padding-block:14px}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--primary);font-weight:700;font-size:21px;letter-spacing:.06em}
.brand .mark{height:50px;width:auto}
.wordmark{display:flex;flex-direction:column;line-height:1.1;gap:3px}
.wm-name{font-family:var(--f-display);font-size:22px;font-weight:700;letter-spacing:.08em;color:var(--primary)}
.wm-sub{font-size:10px;font-weight:700;letter-spacing:.32em;color:var(--accent-text)}
.foot-logo{height:44px;width:auto}
.band-logo{height:56px;width:auto;max-width:100%;object-fit:contain;align-self:flex-start}
.logo-d{display:none}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]) .logo-l{display:none} :root:not([data-theme="light"]) .logo-d{display:block}}
:root[data-theme="dark"] .logo-l{display:none} :root[data-theme="dark"] .logo-d{display:block}
.poster{flex:1 1 360px;min-width:0;background:#13302D;display:flex;align-items:center;justify-content:center;padding:28px}
.featured .poster img{flex:0 0 auto;height:220px;width:auto;object-fit:contain}
.langsw{display:flex;border:1px solid var(--line)}
.langsw a{display:inline-flex;align-items:center;justify-content:center;min-height:34px;min-width:40px;padding:0 10px;color:var(--sub);font-size:13px;font-weight:700;letter-spacing:.04em;text-decoration:none}
.langsw a+a{border-left:1px solid var(--line)}
.langsw a[aria-current]{background:var(--primary);color:var(--on-primary)}
.langsw button{min-height:34px;min-width:40px;padding:0 10px;border:0;background:transparent;color:var(--sub);font:inherit;font-size:13px;font-weight:700;letter-spacing:.04em;cursor:pointer}
.langsw button+button{border-left:1px solid var(--line)}
.langsw button[aria-pressed="true"]{background:var(--primary);color:var(--on-primary)}
.site-head .wrap{column-gap:20px}
.nav{display:flex;flex-wrap:wrap;gap:4px 20px;font-size:15px;font-weight:500}
.nav a{text-decoration:none;color:var(--fg-2);padding:6px 0;border-bottom:2px solid transparent}
.nav a[aria-current="page"]{color:var(--primary);border-bottom-color:var(--accent)}

/* home */
.hero{background:var(--bg-alt);border-bottom:1px solid var(--line-2)}
.hero .wrap{display:flex;flex-wrap:wrap;align-items:center;gap:40px;padding-block:64px}
.hero-text{flex:1 1 420px;min-width:0;display:flex;flex-direction:column;gap:18px}
.hero-img{flex:1 1 360px;min-width:0;height:380px;object-fit:cover}
.intro{display:flex;flex-wrap:wrap;gap:36px;align-items:center}
.avatar{width:160px;height:160px;border-radius:50%;object-fit:cover;object-position:50% 30%;flex:0 0 160px}
.feature{flex:1 1 100%;display:flex;flex-wrap:wrap;gap:24px;align-items:center;padding:28px;background:var(--bg-soft);border:2px solid var(--primary);text-decoration:none;color:var(--fg)}
.feature img{width:72px;height:72px}
.card{flex:1 1 240px;min-width:0;display:flex;flex-direction:column;gap:10px;padding:22px;background:var(--surface);border:1px solid var(--line);text-decoration:none;color:var(--fg)}
.card:hover{border-color:var(--primary)}
.card img.icon{width:52px;height:52px}
.card .t{font-weight:700;font-size:17px;color:var(--primary)}
.card .d{font-size:14px;color:var(--sub);line-height:1.6}
.icon-bg{background:#F3F0E6;border-radius:4px}
.thumbs{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,300px),1fr));gap:24px}
.thumb{display:flex;flex-direction:column;gap:8px;text-decoration:none;color:var(--fg)}
.thumb img{width:100%;aspect-ratio:16/9;object-fit:cover}
.thumb .meta{font-size:12px;color:var(--sub)}
.thumb .tt{font-weight:700;font-size:17px;line-height:1.5}
.pick{display:flex;align-items:center;gap:20px;background:var(--surface);border:1px solid var(--line);padding:18px 22px}
.pick .n{font-family:var(--f-display);font-size:28px;color:var(--accent-text);width:40px}
.ink{background:var(--ink);color:#FFFFFF}
.ink h2{color:#FFFFFF} .ink .eyebrow{color:var(--accent-dark)} .ink .muted{color:var(--on-ink)}
.ink .wrap{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:24px;padding-block:56px}
.ink .btn{background:#FFFFFF;color:#13302D;border-color:#FFFFFF}
.copybox{display:flex;flex-wrap:wrap;align-items:center;gap:10px}
.copybox code{font-family:inherit;user-select:all;background:rgba(255,255,255,.08);padding:6px 10px}
.site-foot{border-top:1px solid var(--line)}
.site-foot .wrap{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:flex-end;gap:12px;padding-block:28px;font-size:13px;color:var(--sub)}
/* about */
.pill{padding:8px 14px;background:var(--bg-soft);color:var(--primary);font-size:14px}
.box{background:var(--surface);border:1px solid var(--line);padding:24px}
.pillar{flex:1 1 240px;min-width:0;border:1px solid var(--line);background:var(--surface);padding:24px;display:flex;flex-direction:column;gap:10px}
.pillar .n{font-family:var(--f-display);font-size:26px;color:var(--accent-text)}

/* specialty */
.spec{display:flex;flex-wrap:wrap;gap:40px;align-items:flex-start;padding-block:24px 72px}
.side{flex:1 1 220px;max-width:260px;border:1px solid var(--line);background:var(--surface);padding:14px;display:flex;flex-direction:column;gap:2px;position:sticky;top:96px}
@media (max-width:760px){.side{position:static;max-width:none}}
.side .lbl{font-size:12px;font-weight:700;color:var(--sub);padding:4px 10px 8px}
.side a{display:block;padding:10px 12px;text-decoration:none;color:var(--fg-2);font-size:15px}
.side a[aria-current="page"]{background:var(--primary);color:var(--on-primary);font-weight:700}
.art{flex:999 1 560px;min-width:0;display:flex;flex-direction:column;gap:44px}
.crumb{font-size:13px;color:var(--sub);padding-top:16px}
figure{margin:0;display:flex;flex-direction:column;gap:6px}
figure img{width:100%;height:320px;object-fit:cover}
figcaption{font-size:12px;color:var(--sub)}
.checks{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:10px}
.checks li{display:flex;gap:12px;align-items:flex-start}
.checks li::before{content:"";flex:0 0 18px;height:18px;margin-top:5px;border:1.5px solid var(--primary-2)}
.defs{display:flex;flex-direction:column}
.defs div{padding:14px 0;border-bottom:1px solid var(--line-2)}
.defs dt{font-weight:700} .defs dd{margin:4px 0 0;color:var(--fg-2);font-size:15px}
.steps{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:10px;counter-reset:s}
.steps li{display:flex;gap:16px;border:1px solid var(--line);background:var(--surface);padding:16px 18px;counter-increment:s}
.steps li::before{content:counter(s);font-family:var(--f-display);font-size:20px;color:var(--accent-text);flex:0 0 24px}
.steps b{display:block}
.steps span{color:var(--fg-2);font-size:15px}
.cares{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,260px),1fr));gap:12px}
.cares div{border:1px solid var(--line);background:var(--surface);padding:18px}
.cares b{display:block;margin-bottom:4px}
.cares span{color:var(--fg-2);font-size:15px}
.warnbox{background:var(--bg-alt);border-left:4px solid var(--warn);padding:24px;display:flex;flex-direction:column;gap:12px}
.warnbox h2{color:var(--warn);font-size:22px}
.warnbox ul{margin:0;padding-left:20px;display:flex;flex-direction:column;gap:8px}
.note{font-size:13px;color:var(--sub);border-top:1px solid var(--line-2);padding-top:16px}

/* columns */
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{min-height:44px;padding:0 18px;border:1px solid var(--line);background:var(--surface);color:var(--primary);font-family:inherit;font-size:14px;cursor:pointer}
.chip[aria-pressed="true"]{background:var(--primary);border-color:var(--primary);color:var(--on-primary);font-weight:700}
.featured{display:flex;flex-wrap:wrap;border:2px solid var(--primary);background:var(--surface);text-decoration:none;color:var(--fg)}
.featured img{flex:1 1 420px;min-width:0;height:300px;object-fit:cover}
.featured div{flex:1 1 340px;padding:28px;display:flex;flex-direction:column;justify-content:center;gap:10px}
input[type=search],input[type=text],input[type=password],select,textarea{min-height:44px;padding:0 12px;border:1px solid var(--line);background:var(--surface);color:var(--fg);font-family:inherit;font-size:15px}
textarea{padding:12px;min-height:180px;resize:vertical;line-height:1.7}

/* post */
.post{max-width:760px;margin:0 auto;padding-block:40px 64px;display:flex;flex-direction:column;gap:28px}
.post p{font-size:17px;line-height:1.9;color:var(--fg)}
.byline{display:flex;align-items:center;gap:12px;font-size:14px;color:var(--sub);padding-bottom:18px;border-bottom:1px solid var(--line)}
.byline img{width:40px;height:40px;border-radius:50%;object-fit:cover;object-position:50% 30%}
.toc{border:1px solid var(--line);background:var(--surface);padding:18px 22px;display:flex;flex-direction:column;gap:6px}
.keybox{border-left:4px solid var(--accent);background:var(--bg-soft);padding:18px 20px}
.tags{display:flex;flex-wrap:wrap;gap:8px}
.tag{padding:6px 12px;background:var(--bg-soft);color:var(--primary);font-size:13px}

/* lecture */
.rows{border-top:2px solid var(--primary)}
.lrow{padding:18px 4px;border-bottom:1px solid var(--line);display:flex;flex-direction:column;gap:12px}
.lrow .top{display:flex;flex-wrap:wrap;align-items:center;gap:14px}
.lock{flex:0 0 44px;height:44px;border:1.5px solid var(--line);display:flex;align-items:center;justify-content:center;color:var(--primary)}
.pwform{display:flex;flex-wrap:wrap;align-items:flex-end;gap:10px;padding:16px;background:var(--bg-alt);margin-left:58px}
@media (max-width:480px){.pwform{margin-left:0}}
.err{color:var(--warn);font-weight:500;font-size:14px;flex:1 1 100%}
.ok{color:var(--primary-2);font-weight:500;font-size:14px}
.demo{border:2px dashed var(--line);padding:22px;display:flex;flex-direction:column;gap:14px}

/* admin */
.tabs{display:flex;flex-wrap:wrap;gap:8px}
.panel{display:flex;flex-wrap:wrap;gap:24px;align-items:flex-start}
.panel form{flex:999 1 520px;min-width:0;background:var(--surface);border:1px solid var(--line);padding:26px;display:flex;flex-direction:column;gap:16px}
.panel aside{flex:1 1 280px;min-width:0;background:var(--surface);border:1px solid var(--line);padding:22px;display:flex;flex-direction:column;gap:12px}
.field{display:flex;flex-direction:column;gap:6px;font-size:14px;font-weight:500}
.item{padding-bottom:12px;border-bottom:1px solid var(--line-2)}
.banner{background:var(--bg-soft);color:var(--primary);font-size:13px;padding:10px 14px}
@media (prefers-reduced-motion:no-preference){main{animation:fade .25s ease-out}}
@keyframes fade{from{opacity:.4}to{opacity:1}}
.thumb.soon{opacity:.6;cursor:default}.thumb.soon .meta{color:var(--accent-text)}
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:12px}
.stat{border:1px solid var(--line);border-top:3px solid var(--accent);background:var(--bg-alt);padding:14px 16px;display:flex;flex-direction:column;gap:4px;min-width:0}
.stat b{font-size:26px;line-height:1.2;color:var(--accent-text);font-variant-numeric:tabular-nums}
.stat span{font-size:14px;line-height:1.55}.stat small{font-size:12px;color:var(--sub)}
.dlg{display:flex;flex-direction:column;gap:10px;border-left:3px solid var(--line);padding-left:16px}
.dlg p{margin:0;display:flex;gap:12px;font-size:16px;line-height:1.75}
.dlg b{flex:0 0 76px;font-size:13px;padding-top:3px;color:var(--sub)}
.dlg .pro b{color:var(--primary)}.dlg .pro span{color:var(--fg)}.dlg .ask span{color:var(--fg-2)}
.disc{font-size:13px;color:var(--sub);background:var(--bg-alt);padding:10px 14px;margin:0}
.ext{font-weight:500;white-space:nowrap}.ext-note{font-size:12px;color:var(--sub)}.ext-foot{font-size:13px;color:var(--sub);display:inline-flex;align-items:center;gap:10px;flex-wrap:wrap;text-decoration:none}.nlogo{height:26px;width:auto;vertical-align:middle}.nl-row{margin:4px 0 6px}.ext-foot a,.nl-row a{display:inline-block;transition:opacity .15s}.ext-foot a:hover,.nl-row a:hover{opacity:.75}.nl-row .nlogo{height:30px}
.cbox{display:flex;flex-direction:column;gap:12px}
.crow{display:flex;align-items:center;gap:14px;padding:12px 14px;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12)}
.cic{flex:0 0 36px;width:36px;height:36px;display:inline-flex;align-items:center;justify-content:center;color:#FFFFFF}
.cic svg{width:26px;height:26px}
.cmain{flex:1 1 auto;min-width:0;display:flex;flex-direction:column;gap:2px}
.clab{font-size:12px;color:var(--on-ink)}
.cmain code{font-family:inherit;font-size:16px;color:#FFFFFF;user-select:all;overflow-wrap:anywhere;background:none;padding:0}
.sns{display:flex;flex-wrap:wrap;gap:10px}
.sns a{flex:1 1 120px;display:flex;align-items:center;gap:8px;padding:10px 12px;border:1px solid rgba(255,255,255,.18);color:#FFFFFF;text-decoration:none;font-size:14px;font-weight:500;transition:background .15s}
.sns a:hover,.sns a:focus-visible{background:rgba(255,255,255,.1);color:#FFFFFF}
.sns .cic{flex-basis:28px;width:28px;height:28px}.sns .cic svg{width:22px;height:22px}
a.cic:hover{opacity:.8}
.zlink{text-decoration:none}.zlink code{text-decoration:underline;text-underline-offset:4px;text-decoration-color:rgba(255,255,255,.4)}
.zqr{display:flex;flex-wrap:wrap;gap:16px;align-items:center;padding:14px;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12)}
.zqr img{width:180px;height:180px;background:#fff;padding:8px;flex:0 0 auto}
.tl{list-style:none;margin:0;padding:0;display:flex;flex-direction:column}
.tl li{display:flex;gap:18px;padding:14px 0;border-top:1px solid var(--line)}
.tl li:last-child{border-bottom:1px solid var(--line)}
.tl-y{flex:0 0 92px;font-size:14px;font-weight:700;color:var(--accent-text);font-variant-numeric:tabular-nums;padding-top:2px}
.tl-b{flex:1 1 auto;min-width:0;display:flex;flex-direction:column;gap:3px}
.tl-m{font-size:13px;color:var(--sub)}.tl-d{font-size:15px;color:var(--fg-2);line-height:1.6}
@media (max-width:480px){.tl li{flex-direction:column;gap:4px}.tl-y{flex-basis:auto}}
[hidden]{display:none!important}