/* =========================================================
   FORMA common.css
   Shared across all pages: reset, variables, typography,
   header/nav, footer, buttons, section shell, reveal animation
   ========================================================= */
:root{
  --cream:#F4EFE4;
  --cream-deep:#ECE4D3;
  --ink:#1F1D18;
  --ink-soft:#5B5648;
  --green:#28402C;
  --green-deep:#1B2E1E;
  --green-soft:#7C9179;
  --green-pale:#E3E9DE;
  --line:#DCD2BC;
  --white:#FFFDF8;
  --radius:14px;
  --maxw:1200px;
}
*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  font-family:'Noto Sans KR',sans-serif;
  background:var(--cream);
  color:var(--ink);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{display:block;max-width:100%;}
a{color:inherit;text-decoration:none;}
.serif{font-family:'Noto Serif KR',serif;}
.display{font-family:'Cormorant Garamond',serif;}
.container{max-width:var(--maxw);margin:0 auto;padding:0 40px;}
@media (max-width:900px){.container{padding:0 24px;}}

/* ---- reveal-on-scroll ---- */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .9s cubic-bezier(.16,.8,.28,1), transform .9s cubic-bezier(.16,.8,.28,1);}
.reveal.in{opacity:1;transform:translateY(0);}
.reveal-stagger > *{opacity:0;transform:translateY(22px);transition:opacity .7s ease, transform .7s ease;}
.reveal-stagger.in > *{opacity:1;transform:translateY(0);}
.reveal-stagger.in > *:nth-child(1){transition-delay:.05s;}
.reveal-stagger.in > *:nth-child(2){transition-delay:.15s;}
.reveal-stagger.in > *:nth-child(3){transition-delay:.25s;}
.reveal-stagger.in > *:nth-child(4){transition-delay:.35s;}
.reveal-stagger.in > *:nth-child(5){transition-delay:.45s;}
.reveal-stagger.in > *:nth-child(6){transition-delay:.55s;}
@media (prefers-reduced-motion: reduce){
  .reveal, .reveal-stagger > *{opacity:1!important;transform:none!important;transition:none!important;}
}

/* ---- generic section shell ---- */
section{padding:120px 0;}
@media (max-width:900px){section{padding:76px 0;}}
.eyebrow{
  display:flex;align-items:center;gap:10px;font-size:12px;letter-spacing:0.16em;color:var(--green);
  text-transform:uppercase;margin-bottom:18px;font-weight:600;
}
.eyebrow::before{content:"";width:22px;height:1px;background:var(--green);}

/* ---- buttons ---- */
.btn{
  display:inline-flex;align-items:center;gap:10px;font-size:14px;font-weight:500;letter-spacing:0.02em;
  padding:15px 26px;border-radius:6px;transition:all .3s cubic-bezier(.16,.8,.28,1);
}
.btn svg{transition:transform .3s ease;}
.btn:hover svg{transform:translateX(4px);}
.btn-solid{background:var(--green);color:var(--cream);}
.btn-solid:hover{background:var(--green-deep);box-shadow:0 8px 20px rgba(40,64,44,0.25);}
.btn-outline{background:transparent;color:var(--green);border:1px solid var(--green);}
.btn-outline:hover{background:var(--green);color:var(--cream);}

/* ================= HEADER ================= */
header{
  position:sticky;top:0;z-index:100;
  background:rgba(244,239,228,0.86);
  backdrop-filter:blur(10px);
  transition:box-shadow .3s ease, background .3s ease;
}
header.scrolled{ box-shadow:0 1px 0 rgba(31,29,24,0.08); background:rgba(244,239,228,0.97); }
.header-inner{
  max-width:var(--maxw);margin:0 auto;padding:20px 40px;
  display:flex;align-items:center;justify-content:space-between;
}
.brand{display:flex;flex-direction:column;line-height:1;gap:4px;}
.brand img{height:44px;width:auto;}
.brand span{font-size:7px;letter-spacing:0.14em;color:var(--ink-soft);}
nav.main-nav{display:flex;gap:44px;align-items:center;}
nav.main-nav a{
  position:relative;font-size:14px;letter-spacing:0.06em;font-weight:500;color:var(--ink);
  padding-bottom:6px;
}
nav.main-nav a::after{
  content:"";position:absolute;left:0;bottom:0;width:100%;height:1.5px;background:var(--green);
  transform:scaleX(0);transform-origin:right;transition:transform .35s cubic-bezier(.16,.8,.28,1);
}
nav.main-nav a:hover::after,nav.main-nav a.active::after{transform:scaleX(1);transform-origin:left;}
nav.main-nav a:hover{color:var(--green);}
nav.main-nav a.active{color:var(--green);}
.header-right{display:flex;align-items:center;gap:28px;}

.menu-btn{
  display:none;
  width:38px;height:38px;border-radius:50%;align-items:center;justify-content:center;
  cursor:pointer;transition:background .25s ease;
}
.menu-btn:hover{background:var(--cream-deep);}
.menu-btn span{display:block;width:16px;height:1px;background:var(--ink);position:relative;transition:background .2s ease;}
.menu-btn span::before,.menu-btn span::after{content:"";position:absolute;left:0;width:16px;height:1px;background:var(--ink);transition:transform .25s ease, top .25s ease;}
.menu-btn span::before{top:-5px;}
.menu-btn span::after{top:5px;}
.menu-btn.open span{background:transparent;}
.menu-btn.open span::before{top:0;transform:rotate(45deg);}
.menu-btn.open span::after{top:0;transform:rotate(-45deg);}

.nav-item{position:relative;display:flex;align-items:center;}
.nav-item > a{display:inline-flex;align-items:center;gap:5px;padding-bottom:6px;}
.nav-item > a svg{width:9px;height:9px;stroke:currentColor;fill:none;stroke-width:1.6;transition:transform .25s ease;}
.nav-item:hover > a svg{transform:rotate(180deg);}
.nav-item::after{content:"";position:absolute;left:0;right:0;bottom:-18px;height:18px;}
.submenu{
  position:absolute;top:calc(100% + 18px);left:50%;transform:translateX(-50%) translateY(4px);
  min-width:236px;background:var(--white);border:1px solid var(--line);border-radius:10px;
  padding:10px;opacity:0;visibility:hidden;pointer-events:none;
  transition:opacity .25s ease, transform .25s ease, visibility .25s ease;
  box-shadow:0 16px 36px rgba(31,29,24,0.10);
}
.nav-item:hover .submenu,.nav-item:focus-within .submenu{opacity:1;visibility:visible;transform:translateX(-50%) translateY(0);pointer-events:auto;}
.submenu a{display:flex;align-items:baseline;gap:10px;padding:9px 12px;font-size:12px;font-weight:500;letter-spacing:0.01em;border-radius:6px;white-space:nowrap;color:var(--ink);}
.submenu a::after{display:none;}
.submenu a:hover{background:var(--green-pale);color:var(--green);}
.submenu a .n{font-family:'Cormorant Garamond',serif;font-style:italic;font-size:12px;color:var(--green-soft);width:14px;flex-shrink:0;}

@media (max-width:920px){
  nav.main-nav{display:none;}
  .menu-btn{display:flex;}
}

/* ---- mobile slide-in nav panel ---- */
.nav-overlay{display:none;}
.mobile-nav{display:none;}
@media (max-width:920px){
  .nav-overlay{
    display:block;position:fixed;inset:0;background:rgba(20,18,14,0.4);
    opacity:0;visibility:hidden;transition:opacity .3s ease, visibility .3s ease;z-index:190;
  }
  .nav-overlay.open{opacity:1;visibility:visible;}

  .mobile-nav{
    display:block;position:fixed;top:0;right:0;height:100vh;width:100vw;max-width:none;
    background:var(--cream);box-shadow:-14px 0 34px rgba(20,18,14,0.14);
    transform:translateX(100%);transition:transform .35s cubic-bezier(.16,.8,.28,1);
    z-index:200;padding:96px 28px 32px;overflow-y:auto;
  }
  .mobile-nav.open{transform:translateX(0);}
}
.mobile-nav a,.mobile-nav-toggle{
  display:flex;align-items:center;justify-content:space-between;width:100%;
  background:none;border:none;font-family:'Noto Sans KR',sans-serif;font-size:15px;font-weight:500;
  color:var(--ink);padding:16px 0;border-bottom:1px solid var(--line);text-align:left;cursor:pointer;
}
.mobile-nav-toggle svg{width:11px;height:11px;stroke:currentColor;fill:none;stroke-width:1.6;transition:transform .25s ease;}
.mobile-nav-item.open .mobile-nav-toggle svg{transform:rotate(180deg);}
.mobile-submenu{max-height:0;overflow:hidden;transition:max-height .3s ease;}
.mobile-nav-item.open .mobile-submenu{max-height:320px;}
.mobile-submenu a{border-bottom:none;padding:11px 0 11px 16px;font-size:13px;font-weight:400;color:var(--ink-soft);}
.mobile-submenu a .n{font-family:'Cormorant Garamond',serif;font-style:italic;font-size:12px;color:var(--green-soft);margin-right:8px;}
.mobile-nav-close{
  position:absolute;top:28px;right:24px;width:34px;height:34px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;cursor:pointer;
}
.mobile-nav-close svg{width:16px;height:16px;stroke:var(--ink);fill:none;stroke-width:1.6;}

/* ================= FOOTER ================= */
footer{padding:56px 0 30px;border-top:1px solid var(--line);}
.foot-top{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:24px;padding-bottom:30px;}
.foot-brand{display:flex;flex-direction:column;gap:6px;}
.brand img{height:44px;width:auto;}
.foot-brand span{font-size:7px;letter-spacing:0.12em;color:var(--ink-soft);}
.foot-meta{font-size:12px;color:var(--ink-soft);line-height:1.9;}
.foot-social{display:flex;gap:10px;}
.foot-social a{
  width:32px;height:32px;border-radius:50%;border:1px solid var(--line);display:flex;align-items:center;justify-content:center;
  transition:all .25s ease;
}
.foot-social a:hover{background:var(--green);border-color:var(--green);color:var(--cream);}
.foot-bottom{border-top:1px solid var(--line);padding-top:20px;font-size:12px;color:var(--ink-soft);}

/* ---- icon base ---- */
.icon{width:20px;height:20px;stroke:currentColor;fill:none;stroke-width:1.5;}

/* =========================================================
   Sub-page hero banner (used by sub01 / sub03 / sub04 —
   NOT the numbered RESEARCH detail hero, which stays as-is
   on sub02_1~6.html)
   ========================================================= */
.sub-hero{
  position:relative; border-radius:var(--radius); overflow:hidden;
  margin:34px 0 64px; min-height:400px;
}
.sub-hero img{ width:100%; height:100%; object-fit:cover; position:absolute; inset:0; }
.sub-hero::after{
  content:""; position:absolute; inset:0;
  
}
.sub-hero-inner{ position:relative; min-height:400px; display:flex; flex-direction:column; justify-content:flex-end; padding:44px 48px; }
.sub-hero-inner .eyebrow-en{ font-size:12px; letter-spacing:0.18em; color:#161616; font-weight:600; margin-bottom:14px; }
.sub-hero-inner h1{ font-family:'Noto Serif KR',serif; font-weight:700; font-size:clamp(24px,3.2vw,32px); color:#203218; line-height:1.6; margin-bottom:14px; }
.sub-hero-inner p{ font-size:14px; line-height:1.6; color:rgba(3, 3, 3, 0.82); max-width:480px; }
@media (max-width:700px){
  .sub-hero, .sub-hero-inner{ min-height:300px; }
  .sub-hero-inner{ padding:30px 26px; }
}