/* MOMENT shared interface system */
:root{
  color-scheme:dark;
  --void:#070a0a;
  --page:#090d0d;
  --surface:#0e1413;
  --surface-raised:#121a18;
  --ink:#eef7f3;
  --copy:#c8d5d0;
  --muted:#8d9c97;
  --line:#26322f;
  --line-strong:#3d4d48;
  --accent:#67efc6;
  --accent-ink:#06120f;
  --danger:#ff6976;
  --gold:#ffd66b;
  --display:"Bahnschrift Condensed","Arial Narrow","Aptos Display",sans-serif;
  --body:"Aptos","Segoe UI",system-ui,-apple-system,"Malgun Gothic",sans-serif;
  --mono:"Cascadia Mono","SFMono-Regular",Consolas,monospace;
  --r-sm:8px;
  --r-md:16px;
  --r-lg:28px;
  --maxw:1180px;
  --ease-out:cubic-bezier(.22,1,.36,1);
}

[hidden]{display:none!important}
*{box-sizing:border-box}
html{scroll-behavior:smooth;background:var(--void)}
body{
  margin:0;
  min-width:300px;
  background:var(--page);
  color:var(--ink);
  font:16px/1.7 var(--body);
  -webkit-font-smoothing:antialiased;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  pointer-events:none;
  z-index:-1;
  border-top:3px solid var(--accent);
  opacity:.8;
}
a{color:var(--accent);text-decoration-thickness:1px;text-underline-offset:4px}
a:hover{text-decoration-color:currentColor}
img{max-width:100%;height:auto}
button,input{font:inherit}
:where(a,button,summary,input):focus-visible{outline:3px solid var(--gold);outline-offset:3px}
::selection{background:var(--accent);color:var(--accent-ink)}

.skiplink{
  position:fixed;
  top:10px;
  left:10px;
  z-index:200;
  transform:translateY(-180%);
  padding:10px 14px;
  border-radius:var(--r-sm);
  background:var(--gold);
  color:#151609;
  font-weight:800;
  transition:transform 180ms var(--ease-out);
}
.skiplink:focus{transform:translateY(0)}

/* Structure */
.wrap{width:min(100%,calc(var(--maxw) + 40px));margin-inline:auto;padding-inline:20px}
.home{width:min(100%,calc(1320px + 40px))}
.section{padding:72px 0;border-top:1px solid var(--line)}
.section[id]{scroll-margin-top:84px}
.section:first-of-type{border-top:0}
main.wrap:not(.home)>.section:first-child{padding-top:clamp(64px,9vw,112px)}
main.wrap:not(.home)>.section>p,
main.wrap:not(.home)>.section>ul,
main.wrap:not(.home)>.section>ol,
main.wrap:not(.home)>.section>h1,
main.wrap:not(.home)>.section>h2,
main.wrap:not(.home)>.section>h3,
main.wrap:not(.home)>.section>figure{max-width:720px}
main.wrap:not(.home)>.section h2{margin-top:clamp(2.8rem,6vw,4.4rem);margin-bottom:.7em}
main.wrap:not(.home)>.section h3{margin-top:2rem}

h1,h2,h3{font-family:var(--display);line-height:.98;margin:0 0 .55em;font-weight:760}
h1{max-width:14ch;font-size:clamp(3.4rem,8vw,6.8rem);letter-spacing:-.045em}
h2{font-size:clamp(2.3rem,5vw,4.7rem);letter-spacing:-.035em}
h3{font-size:clamp(1.25rem,2vw,1.7rem);line-height:1.08;letter-spacing:-.015em}
p{margin:0 0 1em;color:var(--copy)}
.lead{font-size:clamp(1.15rem,2vw,1.4rem);line-height:1.55;color:var(--ink)}
.muted{color:var(--muted)}
strong{color:var(--ink)}
ul,ol{color:var(--copy);padding-left:1.2em}
li{margin:.55em 0}
code{padding:.14em .42em;border:1px solid var(--line);border-radius:5px;background:var(--void);font: .92em var(--mono)}

/* Header */
header.site{
  position:sticky;
  top:0;
  z-index:50;
  background:rgba(9,13,13,.9);
  border-bottom:1px solid var(--line);
  backdrop-filter:blur(16px);
  -webkit-backdrop-filter:blur(16px);
}
.nav{display:flex;align-items:center;gap:24px;min-height:68px}
.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  color:var(--ink);
  font:760 17px/1 var(--display);
  letter-spacing:.19em;
  text-decoration:none;
  white-space:nowrap;
}
.brand:hover{text-decoration:none;color:var(--accent)}
.brand-mark{
  position:relative;
  width:24px;
  height:24px;
  flex:0 0 24px;
  border:2px solid currentColor;
  border-radius:50%;
}
.brand-mark::before,.brand-mark::after{
  content:"";
  position:absolute;
  left:10px;
  top:4px;
  width:2px;
  height:8px;
  border-radius:2px;
  background:var(--accent);
  transform-origin:bottom;
}
.brand-mark::after{transform:rotate(122deg);height:7px;top:5px}
.nav .links{display:flex;align-items:center;gap:20px;margin-left:auto;white-space:nowrap}
.nav .links a{
  color:var(--muted);
  font:700 12px/1 var(--mono);
  letter-spacing:.055em;
  text-transform:uppercase;
  text-decoration:none;
  transition:color 180ms ease;
}
.nav .links a:hover{color:var(--ink)}
.langswitch{
  padding:7px 10px;
  border:1px solid var(--line);
  border-radius:var(--r-sm);
  background:var(--surface);
  color:var(--muted);
  font:700 11px/1 var(--mono);
  letter-spacing:.04em;
  cursor:pointer;
}
.langswitch:hover{color:var(--ink);border-color:var(--line-strong)}

/* CJK typography: neutral tracking and taller lines when translated (wordmark h1 stays English) */
html[lang="ko"] :is(h1,h2,h3):not(#hero-title),html[lang="ja"] :is(h1,h2,h3):not(#hero-title),html[lang="zh-CN"] :is(h1,h2,h3):not(#hero-title){letter-spacing:0;line-height:1.16}
html[lang="ko"] .hero .tag,html[lang="ja"] .hero .tag,html[lang="zh-CN"] .hero .tag{letter-spacing:0;line-height:1.15}
html[lang="ko"] body{word-break:keep-all;overflow-wrap:break-word}
html[lang="ja"] body{font-family:"Segoe UI","Yu Gothic UI",Meiryo,system-ui,sans-serif}
html[lang="zh-CN"] body{font-family:"Segoe UI","Microsoft YaHei",system-ui,sans-serif}

/* Actions */
.btn{
  display:inline-flex;
  min-height:48px;
  align-items:center;
  justify-content:center;
  gap:9px;
  border:1px solid var(--accent);
  border-radius:var(--r-sm);
  padding:12px 18px;
  background:var(--accent);
  color:var(--accent-ink);
  font:800 13px/1.1 var(--mono);
  letter-spacing:.035em;
  text-decoration:none;
  box-shadow:0 12px 32px rgba(103,239,198,.13);
  transition:transform 220ms var(--ease-out),background-color 180ms ease,color 180ms ease,border-color 180ms ease;
}
.btn:hover{transform:translateY(-2px);text-decoration:none;background:#8af6d4}
.btn:active{transform:scale(.98)}
.btn.sec{background:transparent;color:var(--ink);border-color:var(--line-strong);box-shadow:none}
.btn.sec:hover{background:var(--surface-raised);border-color:var(--accent);color:var(--accent)}
.article-actions{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-top:30px!important}

/* Homepage hero */
.hero{
  display:grid;
  grid-template-columns:minmax(300px,.72fr) minmax(540px,1.28fr);
  gap:clamp(34px,5vw,76px);
  align-items:center;
  min-height:calc(100svh - 68px);
  padding:clamp(44px,7vh,82px) 0;
}
.hero-copy{position:relative;min-width:0;padding-left:clamp(20px,3vw,36px);container-type:inline-size}
.hero-copy::before{content:"";position:absolute;left:0;top:4px;bottom:4px;width:2px;background:var(--accent)}
.hero h1{font-size:clamp(5.2rem,8.6vw,10.4rem);font-size:clamp(5.2rem,25cqi,10.4rem);line-height:.72;letter-spacing:-.065em;margin:0 0 28px;color:var(--ink)}
.hero .tag{max-width:12ch;margin:0 0 18px;font:690 clamp(1.8rem,4vw,3.15rem)/1.02 var(--display);letter-spacing:-.035em;color:var(--ink)}
.hero-intro{max-width:38ch;font-size:1.02rem;line-height:1.62;color:var(--muted)}
.hero-actions{display:flex;gap:10px;flex-wrap:wrap;margin:30px 0 24px}

.game-shell{
  position:relative;
  min-width:0;
  padding:14px;
  border:1px solid var(--line-strong);
  border-radius:var(--r-lg);
  background:var(--surface);
  box-shadow:0 36px 90px rgba(0,0,0,.38);
}
.gameframe{width:100%;aspect-ratio:100/65;border:1px solid var(--line);border-radius:var(--r-md);overflow:hidden;background:var(--void)}
.gameframe:focus-within{outline:3px solid var(--gold);outline-offset:4px}
.gameframe iframe{width:100%;height:100%;border:0;display:block}
.gameposter{display:none}

/* Homepage editorial sections */
.home-section{padding:clamp(76px,10vw,136px) 0;border-top:1px solid var(--line)}
.thesis{display:grid;grid-template-columns:minmax(260px,.72fr) minmax(0,1.28fr);gap:clamp(46px,8vw,120px);align-items:start}
.thesis-title{position:sticky;top:108px}
.thesis-title p{max-width:35ch;color:var(--muted)}
.principles{margin:0;padding:0;list-style:none}
.principles li{display:block;padding:26px 0;margin:0;border-top:1px solid var(--line)}
.principles li:last-child{border-bottom:1px solid var(--line)}
.principles h3{margin:0 0 9px;color:var(--ink)}
.principles p{margin:0;max-width:58ch}

.mode-heading{display:grid;grid-template-columns:minmax(0,1fr) minmax(260px,.55fr);gap:30px;align-items:end;margin-bottom:38px}
.mode-heading p{margin:0;color:var(--muted)}
.modegrid{display:grid;grid-template-columns:minmax(0,.92fr) minmax(0,1.08fr);gap:16px}
.mode-card{position:relative;display:flex;min-height:410px;flex-direction:column;padding:clamp(24px,4vw,42px);border:1px solid var(--line-strong);border-radius:var(--r-lg);background:var(--surface);overflow:hidden}
.mode-card h3{max-width:9ch;margin:0 0 auto;padding-bottom:26px;font-size:clamp(2.7rem,5.4vw,5rem);color:var(--ink)}
.mode-card p{max-width:46ch}
.mode-meta{display:flex;gap:18px;flex-wrap:wrap;margin:6px 0 26px;padding:16px 0 0;border-top:1px solid var(--line);color:var(--muted);font:600 13px/1.4 var(--body)}
.mode-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:auto}
.practice-strip{display:grid;grid-template-columns:auto 1fr auto;gap:24px;align-items:center;margin-top:16px;padding:24px 28px;border:1px solid var(--line);border-radius:var(--r-md);background:var(--void)}
.practice-strip h3{margin:0;color:var(--ink)}
.practice-strip p{margin:0;color:var(--muted)}

.strategy-layout{display:grid;grid-template-columns:minmax(260px,.72fr) minmax(0,1.28fr);gap:clamp(46px,8vw,120px)}
.route-list{margin:0;padding:0;list-style:none}
.route-list li{display:grid;grid-template-columns:160px 1fr;gap:20px;margin:0;padding:20px 0;border-top:1px solid var(--line)}
.route-list strong{font-weight:700;font-size:15px;line-height:1.5;color:var(--ink)}
.route-list span{color:var(--copy)}

.learn-layout{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(320px,.85fr);gap:clamp(36px,6vw,82px);align-items:center}
.field-visual{margin:0}
.field-visual img{display:block;width:100%;border:1px solid var(--line-strong);border-radius:var(--r-lg);background:var(--void)}
.field-visual figcaption{margin-top:10px;color:var(--muted);font:11px/1.5 var(--mono)}
.field-copy h2{max-width:9ch}
.reading-links{margin-top:28px;border-bottom:1px solid var(--line)}
.reading-links a{display:grid;grid-template-columns:1fr auto;gap:16px;align-items:center;min-height:62px;border-top:1px solid var(--line);color:var(--ink);text-decoration:none}
.reading-links a:hover{color:var(--accent)}
.reading-links small{color:var(--muted);font:600 12px/1.3 var(--body)}

.faq-layout{display:grid;grid-template-columns:minmax(240px,.65fr) minmax(0,1.35fr);gap:clamp(42px,7vw,100px);align-items:start}
.faq-list details{margin:0;border:0;border-top:1px solid var(--line);border-radius:0;padding:0;background:transparent}
.faq-list details:last-child{border-bottom:1px solid var(--line)}
.faq-list summary{min-height:68px;display:flex;align-items:center;justify-content:space-between;gap:20px;cursor:pointer;color:var(--ink);font-weight:700;list-style:none}
.faq-list summary::-webkit-details-marker{display:none}
.faq-list summary::after{content:"+";color:var(--accent);font:500 25px/1 var(--mono);transition:transform 220ms var(--ease-out)}
.faq-list details[open] summary::after{transform:rotate(45deg)}
.faq-list details p{max-width:70ch;margin:0;padding:0 46px 24px 0;color:var(--muted)}

/* Shared content cards */
.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:28px 34px;margin-top:28px}
.tile{display:block;padding:24px 0;border-top:1px solid var(--line);color:inherit;text-decoration:none}
.tile:hover{text-decoration:none;border-color:var(--accent)}
.tile h3{margin-bottom:.45em;color:var(--ink)}
.tile:hover h3{color:var(--accent)}
.tile p{margin:0;font-size:15px}
.blogfeature{grid-column:1/-1;display:grid;grid-template-columns:minmax(260px,.9fr) minmax(0,1.1fr);padding:0;border:1px solid var(--line-strong);border-radius:var(--r-lg);overflow:hidden;background:var(--surface)}
.blogfeature img{width:100%;height:100%;min-height:270px;object-fit:cover;border-right:1px solid var(--line)}
.blogfeature-copy{display:flex;flex-direction:column;justify-content:center;padding:clamp(24px,4vw,42px)}
.blogfeature .cardmeta{margin-bottom:12px;font-size:13px}
.blogfeature .cardcopy{color:var(--copy);font-size:15px}
.article-visual{margin:34px 0 46px}
.article-visual img{display:block;width:100%;border:1px solid var(--line);border-radius:var(--r-md)}
.article-visual figcaption{margin-top:10px;color:var(--muted);font:12px/1.5 var(--mono)}

/* Legacy FAQ and utility content */
main.wrap:not(.home) details{max-width:780px;margin:0 0 10px;padding:14px 16px;border:1px solid var(--line);border-radius:var(--r-sm);background:var(--surface)}
main.wrap:not(.home) summary{min-height:44px;display:flex;align-items:center;cursor:pointer;color:var(--ink);font-weight:700}
.ad{margin:26px 0;text-align:center}
.ad small{display:block;color:var(--muted);font:10px/1 var(--mono);letter-spacing:.14em;text-transform:uppercase}

/* Footer */
footer.site{margin-top:26px;padding:38px 0 48px;border-top:1px solid var(--line);color:var(--muted);font-size:13px}
footer.site .wrap{display:flex;align-items:flex-end;justify-content:space-between;gap:24px}
footer.site .links{display:flex;gap:18px;flex-wrap:wrap;margin-bottom:9px}
footer.site a{color:var(--muted)}
footer.site a:hover{color:var(--ink)}

@media (max-width:1040px){
  .hero{grid-template-columns:1fr;min-height:auto;padding:72px 0 86px}
  .hero-copy{max-width:700px}
  .hero h1{font-size:clamp(6rem,20vw,10rem)}
  .game-shell{max-width:900px;width:100%;margin-inline:auto}
}

@media (max-width:760px){
  .wrap{padding-inline:16px}
  .nav{min-height:62px;flex-wrap:wrap;gap:8px;padding:10px 0}
  .nav .links{order:2;width:100%;margin-left:0;gap:18px;overflow-x:auto;padding:7px 1px 3px;scrollbar-width:none}
  .nav .links::-webkit-scrollbar{display:none}
  .hero{padding:52px 0 68px;gap:42px}
  .hero-copy{padding-left:20px}
  .hero h1{font-size:clamp(5.1rem,27vw,8.5rem);margin-bottom:24px}
  .hero .tag{font-size:clamp(2rem,10vw,3rem)}
  .game-shell{padding:10px;border-radius:var(--r-md)}
  .gameframe{display:none}
  .gameposter{display:flex;aspect-ratio:12/8;align-items:center;justify-content:center;flex-direction:column;gap:12px;padding:24px;border:1px solid var(--line);border-radius:var(--r-sm);background:#050808 url('arena-daily.png') center/cover no-repeat;text-align:center;text-decoration:none;box-shadow:inset 0 0 0 999px rgba(5,8,8,.66)}
  .gameposter:hover{text-decoration:none}
  .playbadge{display:grid;width:58px;height:58px;place-items:center;border-radius:50%;background:var(--accent);color:var(--accent-ink);font-size:18px;padding-left:3px;box-shadow:0 0 0 8px rgba(103,239,198,.13)}
  .playbadge svg{width:23px;height:23px;fill:currentColor}
  .playlabel{color:var(--ink);font:750 1.7rem/1 var(--display)}
  .postersub{max-width:280px;color:var(--copy);font-size:12px}
  .thesis,.strategy-layout,.learn-layout,.faq-layout,.mode-heading{grid-template-columns:1fr;gap:30px}
  .thesis-title{position:static}
  .modegrid{grid-template-columns:1fr}
  .mode-card{min-height:370px}
  .practice-strip{grid-template-columns:1fr;gap:12px;padding:22px}
  .route-list li{grid-template-columns:1fr;gap:5px}
  .grid{grid-template-columns:1fr}
  .blogfeature{grid-template-columns:1fr}
  .blogfeature img{min-height:0;aspect-ratio:16/9;border-right:0;border-bottom:1px solid var(--line)}
  footer.site .wrap{align-items:flex-start;flex-direction:column}
}

@media (max-width:420px){
  .hero-actions .btn,.mode-actions .btn{width:100%}
  .article-actions .btn{width:100%}
  .mode-card{padding:24px 20px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
}

@media (prefers-reduced-transparency:reduce){
  header.site{background:var(--page);backdrop-filter:none;-webkit-backdrop-filter:none}
}