:root{
  --bg: #06090f;
  --fg: #e6f3ff;
  --accent: #60a5fa;
}

*{ box-sizing: border-box; }
main {
  flex: 1;
  display: flex;
  flex-direction: column;
}
html, body { min-height: 100%; }
body{
  margin:0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
  color: var(--fg);
  background: radial-gradient(1200px 800px at 70% 30%, #0b1220 0%, #06090f 70%);
  min-height: 100dvh;
  overflow-x: hidden;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

.site-header{
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px clamp(16px, 5vw, 64px);
  background: rgba(6,9,15,0.8);
  backdrop-filter: blur(22px);
  border-bottom: 1px solid rgba(255,255,255,0.05);
}

.logo{
  font-weight: 800;
  letter-spacing: 0;
  font-size: 22px;
  color: var(--fg);
  text-decoration: none;
  display: inline-block;
}

.logo .brand-letters {
  font-size: 20px;
}

@media (max-width: 768px) {
  .logo .brand-letters {
    font-size: 18px;
  }
}

.logo:focus-visible{
  outline: 2px solid rgba(255,255,255,0.6);
  outline-offset: 4px;
}

.primary-nav{
  display: flex;
  gap: 24px;
  align-items: center;
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.primary-nav a{
  color: var(--fg);
  text-decoration: none;
  opacity: 0.85;
}
.primary-nav a:hover{ opacity: 1; }

.lang-switch{
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,0.12);
  background: rgba(10,16,28,0.7);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.02);
}
.lang-switch .icon{
  font-size: 10px;
  opacity: 0.7;
}
.lang-button{
  text-decoration: none;
  font-size: 9px;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.6);
  padding: 4px 9px;
  border-radius: 999px;
  transition: color 0.2s ease, background 0.2s ease, opacity 0.2s ease;
}
.lang-button:hover{
  opacity: 1;
}
.lang-button.active{
  color: var(--fg);
  background: rgba(255,255,255,0.15);
  pointer-events: none;
}

.page-content{
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: clamp(24px, 4vw, 64px);
  gap: clamp(18px, 4vh, 32px);
}

.page-lede{
  padding-top: clamp(28px, 5vh, 110px);
  padding-right: clamp(24px, 5vw, 90px);
  padding-bottom: clamp(20px, 4vh, 60px);
  padding-left: clamp(32px, 7vw, 160px);
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.page-lede h1{
  margin: 0;
  font-size: clamp(32px, 8vw, 80px);
  line-height: 1.05;
}
.page-lede p{
  margin: 0;
  opacity: 0.8;
  font-size: clamp(14px, 3vw, 24px);
}

.hero-title{
  margin: 0;
  line-height: 1.05;
}

.hero-subtitle{
  margin: 0;
  opacity: 0.85;
  line-height: 1.6;
  font-size: clamp(1rem, 2.8vw, 1.35rem);
}

.hero-title-en,
.hero-title-ko{
  max-width: 24ch;
  word-break: keep-all;
}

.hero-subtitle-en,
.hero-subtitle-ko{
  max-width: 40rem;
  word-break: keep-all;
}

.about-page .hero-title{
  font-size: clamp(2.6rem, 5vw, 3.4rem);
}

.about-page .page-lede{
  padding-top: clamp(48px, 9vh, 140px);
  padding-bottom: clamp(28px, 6vh, 90px);
}

@media (max-width: 768px){
  .hero-title-en,
  .hero-title-ko,
  .hero-subtitle-en,
  .hero-subtitle-ko{
    max-width: none;
  }
}

.content-section{
  padding-left: clamp(32px, 7vw, 160px);
  padding-right: clamp(24px, 6vw, 120px);
  padding-bottom: clamp(20px, 5vh, 80px);
  display: grid;
  gap: clamp(20px, 3vw, 48px);
}

.content-grid{
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: clamp(16px, 3vw, 36px);
}

.content-card{
  border-radius: 24px;
  border: 1px solid rgba(255,255,255,0.08);
  background: linear-gradient(145deg, rgba(7,12,20,0.85), rgba(5,9,16,0.7));
  padding: clamp(20px, 3vw, 32px);
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.content-card h3{
  margin: 0;
  font-size: 18px;
}
.content-card p{
  margin: 0;
  opacity: 0.85;
  line-height: 1.6;
}

.hero{
  position: relative;
  width: 100%;
  flex: 1;
  height: auto;
  min-height: clamp(520px, 75vh, 960px);
}

#treeCanvas{
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
  transition: opacity .25s ease;
}
#treeCanvas.tree-hidden{
  opacity: 0;
  pointer-events: none;
}

.overlay{
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: flex-start;
  pointer-events: none;
  padding-top: clamp(28px, 5vh, 110px);
  padding-right: clamp(24px, 5vw, 90px);
  padding-bottom: clamp(20px, 4vh, 80px);
  padding-left: clamp(32px, 7vw, 160px);
  gap: clamp(20px, 4vw, 40px);
}

.hero-headlines{
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: min(540px, 60vw);
  padding-left: clamp(10px, 2vw, 36px);
}
.hero-headlines p{
  opacity: 0.8;
}

.overlay.minimalist{
  gap: clamp(16px, 4vw, 48px);
}
.overlay.minimalist h1{
  font-size: clamp(32px, 8vw, 80px);
  margin: 0;
  line-height: 1.04;
  text-shadow: 0 5px 30px rgba(0,0,0,0.45);
}
.overlay.minimalist p{
  margin: 0;
  font-size: clamp(14px, 3vw, 24px);
  opacity: 0.8;
  text-shadow: 0 5px 20px rgba(0,0,0,0.35);
}

.brand-tile{
  align-self: flex-end;
  padding: clamp(16px, 2.3vw, 26px) clamp(24px, 3.8vw, 40px);
  border-radius: 32px;
  border: 1px solid rgba(255,255,255,0.1);
  background: linear-gradient(145deg, rgba(7,12,18,0.82), rgba(7,12,18,0.58));
  box-shadow: 0 24px 70px rgba(0,0,0,0.48);
  text-align: right;
  backdrop-filter: blur(8px);
  pointer-events: none;
  margin-top: clamp(12px, 4vh, 60px);
  margin-right: clamp(12px, 4vw, 80px);
}
.brand-letters{
  font-size: clamp(24px, 4.4vw, 48px);
  font-weight: 700;
  letter-spacing: 0.08em;
}
.brand-stem{
  color: #7feac4;
}
.brand-ly{
  color: #78b7f0;
}
.brand-caption{
  display: block;
  margin-top: 6px;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.4em;
  opacity: 0.7;
  line-height: 1;
}

.site-footer{
  padding: 8px clamp(16px, 4vw, 64px);
  background: rgba(4,6,12,0.78);
  border-top: 1px solid rgba(255,255,255,0.04);
  font-size: 11px;
  opacity: 0.7;
  text-align: center;
}

/* Respect reduced motion */
@media (prefers-reduced-motion: reduce){
  #treeCanvas{ animation: none !important; }
}

@media (max-width: 640px){
  .site-header{
    flex-direction: column;
    align-items: flex-start;
  }
  .primary-nav{
    flex-wrap: wrap;
    gap: 12px 18px;
    font-size: 12px;
    letter-spacing: 0.5px;
  }
  .hero{
    height: auto;
    min-height: 80vh;
  }
  .overlay{
    padding: clamp(24px, 12vh, 110px) clamp(18px, 8vw, 52px);
  }
  .hero-headlines{
    padding-left: clamp(8px, 4vw, 28px);
    max-width: 100%;
  }
  .overlay.minimalist{
    gap: clamp(18px, 6vw, 64px);
  }
  .brand-tile{
    align-self: flex-start;
    text-align: left;
  }
  .overlay h1{
    font-size: clamp(28px, 9vw, 44px);
  }
  .overlay p{
    font-size: clamp(14px, 4vw, 18px);
  }
}