/* ─── CSS 변수 ─── */
:root {

  /* 배경색 */
  --color-bg-primary:    #ffffff;
  --color-bg-secondary:  #f7f7f7;
  --color-bg-dark:       #1e1e1e;

  /* 포인트 컬러 (다크 레드) */
  --color-red:           #4A0A05;
  --color-red-bright:    #db2214;
  --color-red-dark:      #c01b0f;
  --color-red-dim:       rgba(74, 10, 5, 0.12);

  /* 텍스트 */
  --color-text-primary:  #4A0A05;
  --color-text-muted:    #aaaaaa;
  --color-text-white:    #ffffff;

  /* 테두리 */
  --color-border:        rgba(74, 10, 5, 0.15);
  --color-border-subtle: rgba(74, 10, 5, 0.06);

  /* 오버레이 */
  --color-overlay-dark:  rgba(0, 0, 0, 0.65);

  /* ─── 폰트 패밀리 ─── */
  --font-body: sans-serif;

  /* ─── 폰트 크기 (1rem = 10px) ─── */
  --text-2xs:  1.2rem;    /* 12px */
  --text-xs:   1.4rem;    /* 14px */
  --text-sm:   1.6rem;    /* 16px */
  --text-base: 1.8rem;    /* 18px */
  --text-md:   1.8rem;    /* 18px */
  --text-lg:   2rem;      /* 20px */
  --text-xl:   2.4rem;    /* 24px */
  --text-2xl:  3.2rem;    /* 32px */
  --text-3xl:  4rem;      /* 40px */
  --text-4xl:  5.6rem;    /* 56px */
  --text-5xl:  8rem;      /* 80px */
  --text-6xl:  10.4rem;   /* 104px */

  /* ─── 폰트 굵기 ─── */
  --fw-light:    300;
  --fw-regular:  400;
  --fw-medium:   500;
  --fw-semibold: 600;
  --fw-bold:     900;

  /* ─── 자간 ─── */
  --ls-widest:  0.3em;
  --ls-wide:    0.15em;
  --ls-normal:  0.05em;

  /* ─── 간격 (1rem = 10px) ─── */
  --space-xs:  0.8rem;    /*  8px */
  --space-sm:  1.6rem;    /* 16px */
  --space-md:  3.2rem;    /* 32px */
  --space-lg:  6.4rem;    /* 64px */
  --space-xl:  9.6rem;    /* 96px */
  --space-2xl: 12.8rem;   /* 128px */
  --space-3xl: 19.2rem;   /* 192px */

  /* ─── 레이아웃 ─── */
  --max-width:     1320px;
  --container-pad: 8rem;
  --banner-h:      5rem;  

  /* ─── 전환 ─── */
  --transition:      all 0.3s ease;
  --transition-slow: all 0.65s ease;
}

/* ───── 리셋 ───── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 62.5%; 
}

body {
  font-family: var(--font-body);
  font-size: 1.6rem; 
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
}

ul, ol {
  list-style: none;
}

img {
  max-width: 100%;
  display: block;
}

/* ───── 네비게이션 ───── */
.nav {
  position: fixed;
  top: var(--banner-h);
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 2rem 0;
  opacity: 0;
  pointer-events: none;
  transition: var(--transition);
}
.nav.visible {
  opacity: 1;
  pointer-events: auto;
}
.nav.scrolled {
  padding: 2rem 0;
  background: rgba(255, 255, 255, 0.3);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 2px 12px var(--color-border-subtle);
}

.nav__container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--container-pad);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__logo-en {
  font-size: var(--text-2xl);
  font-weight: var(--fw-bold);
  color: var(--color-red);
  letter-spacing: var(--ls-normal);
}

.nav__menu {
  display: flex;
  align-items: center;
  gap: 4rem;
  list-style: none;
}

.nav__link {
  font-size: var(--text-base);
  font-weight: var(--fw-medium);
  color: var(--color-red);
  transition: var(--transition);
}
.nav__link:hover {
  color: var(--color-red-bright);
}

/* ─────────────────────────────────────────────
   푸터
───────────────────────────────────────────── */
.footer {
  background: var(--color-text-primary);
  border-top: 1px solid rgba(74, 10, 5, 0.2);
  padding: 8rem 8rem 3.2rem 8rem;
}
.footer__inner {
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  margin-bottom: 3.2rem;
}

.footer__logo {
  font-size: var(--text-2xl);
  font-weight: var(--fw-bold);
  color: var(--color-text-white);
  letter-spacing: var(--ls-normal);
  margin-bottom: 1.6rem;
}
.footer__tagline {
  font-size: var(--text-xs);
  letter-spacing: var(--ls-widest);
  color: rgba(255, 255, 255, 0.4);
  text-transform: uppercase;
  margin-bottom: 2.4rem;
}
.footer__desc {
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.4);
  line-height: 1.8;
  margin-bottom: 2.4rem;
}
.footer__sns {
  display: flex;
  gap: 1.9rem;
  margin-bottom: 2.4rem;
}
.footer__sns-item {
  width: 4.2rem;
  height: 4.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 50%;
  color: rgba(255, 255, 255, 0.4);
  transition: border-color 0.2s ease, color 0.2s ease, background 0.2s ease;
}
.footer__sns-item:hover {
  border-color: var(--color-red-bright);
  color: var(--color-red-bright);
  background: rgba(219, 34, 20, 0.08);
}
.footer__sns-item--text {
  font-size: var(--text-xs);
  font-weight: var(--fw-bold);
  letter-spacing: 0;
}

.footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--text-xs);
  color: rgba(255, 255, 255, 0.2);
  letter-spacing: var(--ls-normal);
}


/* ───── 햄버거 버튼 — 데스크탑에서 숨김 ───── */
.nav__hamburger {
  display: none;
}


/* ─────────────────────────────────────────────
   반응형 네비게이션
───────────────────────────────────────────── */

/* Laptop 1024px */
@media (max-width: 1024px) {
  .nav__container {
    padding: 0 6rem;
  }
}

/* Tablet 768px — 햄버거 메뉴 전환 */
@media (max-width: 768px) {
  .nav {
    padding: 0;
  }
  .nav.scrolled {
    padding: 0;
  }
  .nav__container {
    padding: 0 4rem;
    height: 7.2rem;
    position: relative;
  }
  .nav__logo-en{
  font-size: var(--text-xl);    
  }
  .nav__menu{
  gap: 2.5rem;    
  }
  .nav__link{
  font-size: var(--text-sm);
  }

  .footer {
    padding: 6rem 6rem 3.2rem 6rem;
  }
  .footer__logo {
    font-size: var(--text-xl);
  }
  .footer__tagline {
    font-size: var(--text-2xs);
  }
  .footer__desc {
    font-size: var(--text-xs);
  }
  .footer__bottom {
    font-size: var(--text-2xs);
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
}

/* Mobile L 430px */
@media (max-width: 430px) {
  .nav__container {
    padding: 0 3rem;
  }
  .nav__logo-en{
    font-size: var(--text-lg);
  }

  /* 햄버거 버튼 */
  .nav__hamburger {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    z-index: 10;
  }
  .nav__hamburger span {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--color-red);
    border-radius: 2px;
    transition: transform 0.3s ease, opacity 0.3s ease;
    transform-origin: center;
  }
  .nav__hamburger.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav__hamburger.is-open span:nth-child(2) { opacity: 0; }
  .nav__hamburger.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

  .nav__menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
    padding: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease, padding 0.3s ease;
  }
  .nav__menu.is-open {
    max-height: 32rem;
  }
  .nav__menu li {
    width: 100%;
  }
  .nav__link {
    display: block;
    text-align: -webkit-center;
    padding: 1.6rem 3.2rem;
    font-size: var(--text-sm);
    border-bottom: 1px solid var(--color-border-subtle);
  }
  .nav__menu li:last-child .nav__link {
    border-bottom: none;
  }
  .footer {
    padding: 4rem 4rem 3.2rem 4rem;
  }
  .footer__logo {
    font-size: var(--text-lg);
  }
  .footer__tagline {
    font-size: 1rem;
  }
  .footer__desc {
    font-size: var(--text-2xs);
  }
  .footer__bottom {
    font-size: 1rem
  }
}

/* Mobile S 360px */
@media (max-width: 360px) {
  .nav__container {
    padding: 0 2rem;
  }
  .nav__logo-en {
    font-size: var(--text-md);
  }
  .footer {
    padding: 4rem 1.6rem 2rem;
  }
}