/* ═══════════ ARTN 공용 스타일 — 다크 사이드바 레이아웃 ═══════════ */
:root{
  --ink:#171310;
  --ink-deep:#110E0A;
  --cell:#1D1812;
  --paper:#F5F1E7;
  --sub:rgba(245,241,231,.62);
  --faint:rgba(245,241,231,.42);
  --copper:#B26B3B;
  --copper-soft:#C98A57;
  --line:rgba(245,241,231,.14);
  --sans:"Pretendard Variable",Pretendard,-apple-system,"Segoe UI","Malgun Gothic",sans-serif;
  --serif:"Cormorant Garamond",Georgia,serif;
  --sidew:clamp(300px,15.5vw,400px);
  --pad:clamp(24px,3.5vw,90px);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--sans);background:var(--ink);color:var(--paper);font-size:clamp(15.5px,0.55vw + 8px,20px);line-height:1.75;-webkit-font-smoothing:antialiased;word-break:keep-all}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font-family:inherit;color:inherit;background:none;border:none;cursor:pointer}
::selection{background:var(--copper);color:var(--paper)}

/* ── 타이포 ── */
.latin-italic{font-family:var(--serif);font-style:italic;font-weight:500}
.eyebrow{font-size:11px;font-weight:650;letter-spacing:.26em;text-transform:uppercase;color:var(--copper-soft)}
.h-sect{font-size:clamp(26px,2.9vw,56px);font-weight:800;letter-spacing:-.03em;line-height:1.24}
.body-copy{color:var(--sub);max-width:58ch;font-size:clamp(15px,0.85vw,19px)}
.caption{font-size:clamp(12.5px,0.72vw,15px);color:var(--faint);letter-spacing:.02em;line-height:1.6}

/* ── 버튼 ── */
.btn{display:inline-flex;align-items:center;gap:10px;font-size:clamp(13.5px,0.8vw,16.5px);font-weight:600;letter-spacing:.06em;padding:14px 24px;border:1px solid var(--line);color:var(--paper);transition:background .25s,color .25s,border-color .25s;white-space:nowrap}
.btn .arr{transition:transform .25s}
.btn:hover .arr{transform:translateX(4px)}
.btn:hover{background:var(--paper);color:var(--ink);border-color:var(--paper)}
.btn-fill{background:var(--paper);color:var(--ink);border-color:var(--paper)}
.btn-fill:hover{background:transparent;color:var(--paper);border-color:var(--paper)}
.textlink{display:inline-flex;align-items:center;gap:8px;font-size:14px;font-weight:650;letter-spacing:.04em;color:var(--copper-soft);border-bottom:1px solid transparent;transition:border-color .2s}
.textlink:hover{border-color:var(--copper-soft)}
.textlink .arr{transition:transform .25s}
.textlink:hover .arr{transform:translateX(3px)}

/* ── 사이드바 ── */
.side{position:fixed;inset:0 auto 0 0;width:var(--sidew);background:var(--ink-deep);border-right:1px solid var(--line);display:flex;flex-direction:column;padding:40px 36px;z-index:40;overflow-y:auto}
.wordmark{font-weight:900;letter-spacing:-.01em;line-height:1}
.wordmark span{color:var(--copper)}
.side .wordmark{font-size:clamp(42px,2.7vw,58px)}
.side-nav{margin-top:64px;display:flex;flex-direction:column;gap:40px;flex:1}
.grp b{display:block;font-size:clamp(10.5px,0.65vw,13px);letter-spacing:.28em;color:var(--copper-soft);font-weight:700;margin-bottom:13px;text-transform:uppercase}
.grp a,.grp button{display:block;font-size:clamp(16.5px,1.05vw,21px);font-weight:600;letter-spacing:-.01em;padding:4px 0;color:var(--sub);transition:color .2s;text-align:left;width:100%}
.grp a:hover,.grp button:hover{color:var(--paper)}
.grp .on{color:var(--paper);position:relative}
.grp a.on::before,.grp button.on::before{content:"";position:absolute;left:-36px;top:50%;width:22px;height:1px;background:var(--copper)}
.grp button.on{color:var(--copper-soft)}
.side-foot{font-size:12px;color:var(--faint);line-height:1.9}
.side-foot a:hover{color:var(--copper-soft)}

main{margin-left:var(--sidew);min-height:100vh;display:flex;flex-direction:column}

/* ── 페이지 헤더 ── */
.page-head{display:flex;align-items:baseline;gap:22px;padding:44px var(--pad) 30px;border-bottom:1px solid var(--line);flex-wrap:wrap}
.page-head h1{font-size:clamp(30px,3vw,58px);font-weight:850;letter-spacing:-.03em}
.page-head .latin-italic{color:var(--faint);font-size:clamp(16px,1.5vw,27px)}
.page-head .meta{margin-left:auto;font-size:11px;letter-spacing:.22em;color:var(--faint);text-transform:uppercase}

.sect{padding:clamp(48px,6vw,84px) var(--pad);border-bottom:1px solid var(--line);scroll-margin-top:70px}
 
.sect-intro{max-width:760px;margin-bottom:clamp(36px,4.5vw,60px)}
.sect-intro .eyebrow{display:block;margin-bottom:18px}
.sect-intro p{margin-top:22px}

/* ── 이미지 ── */
.imgbox{overflow:hidden;background:var(--ink-deep)}
.imgbox img{width:100%;height:100%;object-fit:cover;transition:transform 1.1s cubic-bezier(.2,.6,.2,1)}
.imgbox:hover img{transform:scale(1.035)}
figure figcaption{margin-top:12px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}

/* ── 리빌 ── */
[data-reveal]{opacity:0;transform:translateY(16px);transition:opacity .7s cubic-bezier(.2,.6,.2,1),transform .7s cubic-bezier(.2,.6,.2,1)}
[data-reveal].in{opacity:1;transform:none}
html.static [data-reveal]{opacity:1!important;transform:none!important;transition:none!important}
html.static{scroll-behavior:auto}

/* ── 마퀴 ── */
@keyframes marq{to{transform:translateX(-50%)}}

/* ── 프로세스 스텝 ── */
.steps{counter-reset:st;display:grid;grid-template-columns:repeat(5,1fr);gap:0;border-top:1px solid var(--line)}
.steps li{counter-increment:st;list-style:none;padding:22px 16px 6px 0}
.steps li::before{content:"0" counter(st);font-family:var(--serif);font-style:italic;font-size:17px;color:var(--copper-soft);display:block;margin-bottom:10px}
.steps li b{display:block;font-size:clamp(15px,0.95vw,19px);font-weight:700;margin-bottom:4px;letter-spacing:-.01em}
.steps li span{font-size:clamp(12.5px,0.75vw,15px);color:var(--faint);line-height:1.55}
.steps li+li{border-left:1px solid var(--line);padding-left:16px}

/* ── 원스크린 헬퍼 ── */
.fillsect{flex:1;display:flex;align-items:center;border-bottom:0}
.fillsect>*{width:100%}
.bbar{margin-top:auto;display:flex;justify-content:space-between;align-items:center;gap:20px;padding:18px var(--pad);border-top:1px solid var(--line);font-size:11px;letter-spacing:.12em;color:var(--faint);flex-wrap:wrap}
.bbar .next{display:inline-flex;gap:12px;align-items:baseline;font-size:clamp(16px,1vw,20px);font-weight:750;letter-spacing:-.01em;color:var(--paper);transition:color .25s}
.bbar .next:hover{color:var(--copper-soft)}
.bbar .next i{font-style:normal;font-size:10px;letter-spacing:.24em;color:var(--faint);font-weight:650}

/* ── 슬림 푸터 ── */
.pfoot{margin-top:auto;display:flex;justify-content:space-between;align-items:center;gap:18px;padding:24px var(--pad);font-size:11.5px;letter-spacing:.1em;color:var(--faint);flex-wrap:wrap}
.pfoot a:hover{color:var(--copper-soft)}
.pfoot .links{display:flex;gap:22px;flex-wrap:wrap}

/* ── 다음 페이지 내비 ── */
.nextpage{display:flex;justify-content:space-between;align-items:center;gap:14px 20px;padding:34px var(--pad);border-bottom:1px solid var(--line);flex-wrap:wrap}
.nextpage span{font-size:11px;letter-spacing:.24em;color:var(--faint)}
.nextpage a{font-size:clamp(19px,2vw,26px);font-weight:750;letter-spacing:-.02em;display:inline-flex;gap:12px;align-items:center;transition:color .25s}
.nextpage a:hover{color:var(--copper-soft)}

/* ── 모바일 상단바 + 메뉴 ── */
.mtop{display:none}
.mmenu{position:fixed;inset:0;z-index:75;background:var(--ink-deep);display:flex;flex-direction:column;justify-content:center;padding:0 28px;gap:2px;opacity:0;pointer-events:none;transition:opacity .3s;overflow-y:auto}
.mmenu.open{opacity:1;pointer-events:auto}
.mmenu a{font-size:clamp(22px,6vw,32px);font-weight:800;letter-spacing:-.02em;padding:9px 0;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;align-items:center;color:var(--paper)}
.mmenu a em{font-family:var(--serif);font-style:italic;font-weight:500;font-size:13px;letter-spacing:.08em;color:var(--copper-soft)}
@media(max-width:960px){
  :root{--pad:clamp(20px,4.5vw,34px)}
  .side{display:none}
  main{margin-left:0}
  .mtop{display:flex;align-items:center;justify-content:space-between;padding:16px var(--pad);border-bottom:1px solid var(--line);position:sticky;top:0;background:rgba(17,14,10,.94);backdrop-filter:blur(10px);z-index:50}
  .mtop .wordmark{font-size:24px}
  .burger{display:flex;flex-direction:column;gap:5px;padding:8px}
  .burger i{display:block;width:22px;height:1.5px;background:var(--paper)}
  .page-head{padding:28px var(--pad) 18px}
  .sect{scroll-margin-top:64px}
  .steps{grid-template-columns:1fr 1fr;border-top:0}
  .steps li{border-top:1px solid var(--line)}
  .steps li+li{border-left:0}
  .steps li:nth-child(even){border-left:1px solid var(--line);padding-left:16px}
  /* 메뉴가 화면보다 길어지면 가운데 정렬이 위쪽을 잘라먹는다 — 위에서부터 쌓고 스크롤 */
  .mmenu{justify-content:flex-start;padding:84px var(--pad) 48px}
  .nextpage{padding:26px var(--pad)}
  .nextpage a{font-size:clamp(18px,5vw,24px)}
}
@media(max-width:520px){
  .steps{grid-template-columns:1fr}
  .steps li,.steps li+li,.steps li:nth-child(even){border-left:0;padding-left:0;padding-right:0}
  .btn{padding:13px 20px}
}
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
  html{scroll-behavior:auto}
}