/* Header */
header{
  position:fixed;top:0;left:0;right:0;
  z-index:100;
  padding:2rem 3rem;
  display:flex;
  justify-content:space-between;
  align-items:center;

  background:linear-gradient(180deg,rgba(8,8,8,.92) 0%,rgba(8,8,8,.66) 65%,rgba(8,8,8,0) 100%);
  backdrop-filter:blur(10px);
  border-bottom:1px solid rgba(255,255,255,.08);
}

.logo{
  font-family:var(--font-serif);
  font-size:1.25rem;
  letter-spacing:-.02em;
}

nav{
  display:flex;
  gap:3rem;
  align-items:center;
}

nav a{
  font-size:.875rem;
  font-weight:400;
  letter-spacing:.02em;
  color:var(--color-text);
  transition:opacity .3s ease,color .3s ease;
}
nav a:hover{opacity:.85;color:#fff}
nav a[aria-current="page"]{opacity:1; text-decoration:underline; text-underline-offset:.25em; text-decoration-thickness:1.5px}

.header-toggle{
  font-size:.875rem;
  color:var(--color-text);
  transition:opacity .3s ease;
}
.header-toggle:hover{opacity:.6}

/* Hero */
.hero{
  min-height:100vh;
  display:flex;
  flex-direction:column;
  justify-content:center;
  padding:0 3rem;
  position:relative;
}

.hero-title{
  font-family:var(--font-serif);
  font-size:clamp(5rem,10vw,8rem);
  font-weight:400;
  line-height:1.05;
  letter-spacing:-.03em;
  max-width:14ch;
  animation:fadeUp 1.2s ease-out;
}
.hero-title em{font-style:italic}

.hero-video{
  position:absolute;
  right:3rem;bottom:3rem;
  width:280px;height:180px;
  background:linear-gradient(135deg,#1a1a1a 0%,#2a2a2a 100%);
  overflow:hidden;
  animation:fadeIn 1.5s ease-out .5s both;
}
.hero-video::after{
  content:'';
  position:absolute;inset:0;
  background:repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(255,255,255,.03) 2px,
    rgba(255,255,255,.03) 4px
  );
  pointer-events:none;
}

/* (선택) hero 이미지 묶음 */
.hero-images{
  display:flex;
  gap:12px;
  justify-content:center;
  flex-wrap:wrap;
  margin:16px 0;
}
.hero-images img{max-width:180px;height:auto;display:block}

/* Intro */
.intro{
  padding:10rem 3rem;
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:4rem;
  align-items:center;
}
.intro-text{
  font-size:1.375rem;
  line-height:1.7;
  color:var(--color-text-muted);
  max-width:540px;
}
.intro-link{
  display:inline-flex;
  align-items:center;
  gap:.5rem;
  margin-top:2rem;
  font-size:.9375rem;
  border-bottom:1px solid var(--color-text-muted);
  padding-bottom:.25rem;
}
.intro-link::after{content:'→';transition:transform .3s ease}
.intro-link:hover::after{transform:translateX(4px)}

/* Values */
.values{
  padding:10rem 3rem;
}
.values-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:2rem;
  margin-bottom:4rem;
}
.value-item{
  font-family:var(--font-serif);
  font-size:clamp(2rem,5vw,4rem);
  font-weight:400;
  letter-spacing:-.02em;
  opacity:0;
  transform:translateY(30px);
  animation:revealValue .8s ease-out forwards;
}
.value-item:nth-child(1){animation-delay:.1s}
.value-item:nth-child(2){animation-delay:.2s}
.value-item:nth-child(3){animation-delay:.3s}
.values-description{
  max-width:600px;
  font-size:1.125rem;
  line-height:1.8;
  color:var(--color-text-muted);
}
.values-cta{margin-top:2.5rem}
.values-cta a{
  font-size:.9375rem;
  border-bottom:1px solid var(--color-text-muted);
  padding-bottom:.25rem;
}

/* Footer */
footer{
  padding:6rem 3rem 3rem;
  border-top:1px solid rgba(255,255,255,.1);
}
.footer-grid{
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:4rem;
  margin-bottom:4rem;
}
.footer-location h3{
  font-family:var(--font-sans);
  font-size:.75rem;
  font-weight:500;
  letter-spacing:.1em;
  text-transform:uppercase;
  margin-bottom:1rem;
  color:var(--color-text-muted);
}
.footer-location address{
  font-style:normal;
  font-size:.9375rem;
  line-height:1.8;
  color:var(--color-text-muted);
}
.footer-location address a{transition:color .3s ease}
.footer-location address a:hover{color:var(--color-text)}
.footer-bottom{
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding-top:2rem;
  border-top:1px solid rgba(255,255,255,.05);
  font-size:.8125rem;
  color:var(--color-text-muted);
}

/* Scroll Indicator */
.scroll-indicator{
  position:absolute;
  bottom:3rem;left:3rem;
  display:flex;
  align-items:center;
  gap:1rem;
  font-size:.75rem;
  letter-spacing:.1em;
  text-transform:uppercase;
  color:var(--color-text-muted);
  animation:pulse 2s ease-in-out infinite;
}
.scroll-indicator::before{
  content:'';
  width:1px;height:40px;
  background:linear-gradient(to bottom,var(--color-text-muted),transparent);
}
/* Professor page typography */
.professor-content .overlay-grid,
.professor-content .overlay-grid * {
  font-family: var(--font-serif);
}