/* ===========================================================
   BRIGHTTALE 공식 홈페이지 — 디자인 시스템
   BLACK × CHAMPAGNE GOLD × IVORY
   =========================================================== */

:root{
  /* 색 — 정보팀 실측(Sandfall Interactive, 색상수치.md)을 근거로 톤을 낮춰 확정 */
  --black-0:#0b0b0c;      /* 페이지 바탕 */
  --black-1:#141416;      /* 카드/패널 */
  --black-2:#1b1b1f;      /* 카드 hover, 구분 배경 */
  --hairline:rgba(217,184,118,.16);
  --hairline-strong:rgba(217,184,118,.32);
  --gold:#d9b876;         /* 차분한 샴페인 골드 */
  --gold-strong:#e9cd97;
  --gold-dim:rgba(217,184,118,.55);
  --ivory:#f3eee2;
  --ivory-dim:#c7c0b1;
  --ivory-faint:#847e70;

  /* 타이포 */
  --font-kr:'Pretendard',-apple-system,BlinkMacSystemFont,'Malgun Gothic',system-ui,sans-serif;
  --font-serif:'Gowun Batang',serif;
  --font-latin:'Cormorant Garamond',serif;

  /* 리듬 */
  --container:1180px;
  --pad-inline:clamp(20px,5vw,72px);
  --section-pad:clamp(64px,11vw,148px);
  --ease:cubic-bezier(.16,.8,.24,1);
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{margin:0;background:var(--black-0);color:var(--ivory-dim);font-family:var(--font-kr);
  line-height:1.75;font-size:16px;-webkit-font-smoothing:antialiased;overflow-x:hidden}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
h1,h2,h3,p,figure,blockquote{margin:0}
ul{margin:0;padding:0;list-style:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
.container{max-width:var(--container);margin:0 auto;padding-inline:var(--pad-inline)}
.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;
  clip:rect(0,0,0,0);white-space:nowrap;border:0}
::selection{background:var(--gold);color:var(--black-0)}

.skip-link{position:fixed;top:-100%;left:12px;z-index:200;background:var(--gold);color:var(--black-0);
  padding:10px 18px;border-radius:2px;font-size:.85rem;font-weight:600;transition:top .2s var(--ease)}
.skip-link:focus{top:12px}

/* ── 헤더 / 내비 ───────────────────────────────────────── */
.site-header{position:sticky;top:0;z-index:100;background:rgba(11,11,12,.78);
  backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid var(--hairline)}
.site-header .bar{display:flex;align-items:center;justify-content:space-between;
  padding-block:14px;gap:24px}
.brand{display:flex;align-items:center}
.brand img{height:26px;width:auto;
  filter:invert(1) sepia(.35) saturate(3) hue-rotate(-10deg) brightness(1.25);
  mix-blend-mode:screen;opacity:.95}
.nav-desktop{display:flex;align-items:center;gap:clamp(20px,3vw,44px)}
.nav-desktop a{font-size:.86rem;letter-spacing:.04em;color:var(--ivory-dim);
  position:relative;padding-block:4px;transition:color .25s var(--ease)}
.nav-desktop a::after{content:'';position:absolute;left:0;right:0;bottom:0;height:1px;
  background:var(--gold);transform:scaleX(0);transform-origin:left;transition:transform .3s var(--ease)}
.nav-desktop a:hover{color:var(--gold)}
.nav-desktop a:hover::after{transform:scaleX(1)}
.nav-toggle{display:none;flex-direction:column;gap:5px;padding:8px;margin-inline:-8px}
.nav-toggle span{width:22px;height:1px;background:var(--gold)}
.nav-mobile{display:none}

@media (max-width:760px){
  .nav-desktop{display:none}
  .nav-toggle{display:flex}
  .nav-mobile{position:fixed;inset:0;top:57px;background:var(--black-0);
    transform:translateY(-8px);opacity:0;pointer-events:none;transition:opacity .25s var(--ease),transform .25s var(--ease);
    z-index:99;overflow-y:auto}
  .nav-mobile.open{display:block;opacity:1;transform:translateY(0);pointer-events:auto}
  .nav-mobile .container{padding-block:32px;display:flex;flex-direction:column;gap:4px}
  .nav-mobile a{display:block;padding:16px 4px;font-size:1.15rem;border-bottom:1px solid var(--hairline);color:var(--ivory)}
  .nav-mobile .legal-row{display:flex;flex-wrap:wrap;gap:14px 22px;padding-top:22px}
  .nav-mobile .legal-row a{padding:0;border:0;font-size:.82rem;color:var(--ivory-faint)}
}

/* ── 공통 섹션 리듬 ────────────────────────────────────── */
section{padding-block:var(--section-pad);position:relative}
.eyebrow{display:inline-block;font-size:.78rem;letter-spacing:.22em;color:var(--gold);
  text-transform:uppercase;margin-bottom:18px}
h2.title{font-family:var(--font-serif);font-weight:700;color:var(--ivory);
  font-size:clamp(1.7rem,4vw,2.7rem);line-height:1.45;letter-spacing:-.01em}
.lead{margin-top:20px;color:var(--ivory-dim);font-size:clamp(1rem,1.6vw,1.2rem);line-height:1.9;
  max-width:640px}
.section-head{max-width:760px}

/* 등장 애니메이션 — 느린 페이드 + 미세한 상승만 */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .9s var(--ease),transform .9s var(--ease)}
.reveal.in{opacity:1;transform:translateY(0)}
@media (prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none}
}

/* ── 버튼 ──────────────────────────────────────────────── */
.btn{display:inline-flex;align-items:center;gap:10px;padding:.95em 2.1em;font-size:.8rem;
  letter-spacing:.14em;text-transform:uppercase;border:1px solid var(--gold-dim);color:var(--gold);
  border-radius:2px;transition:background .3s var(--ease),color .3s var(--ease),border-color .3s var(--ease)}
.btn:hover{background:var(--gold);color:var(--black-0);border-color:var(--gold)}
.btn-arrow{transition:transform .3s var(--ease)}
.btn:hover .btn-arrow{transform:translateX(4px)}
.btn-quiet{border-color:var(--hairline-strong);color:var(--ivory-dim)}
.btn-quiet:hover{background:var(--ivory);color:var(--black-0);border-color:var(--ivory)}

/* ── 별 배경 (히어로/푸터 공용, 절제된 정적+미세 트윙클) ─── */
.starfield{position:absolute;inset:0;overflow:hidden;pointer-events:none}
.starfield i{position:absolute;display:block;width:2px;height:2px;border-radius:50%;
  background:var(--gold-strong);opacity:.55;animation:tw 5s ease-in-out infinite}
.starfield i.big{width:3px;height:3px;box-shadow:0 0 6px 1px rgba(217,184,118,.5)}
@keyframes tw{0%,100%{opacity:.15}50%{opacity:.85}}
@media (prefers-reduced-motion:reduce){.starfield i{animation:none;opacity:.4}}

/* ── 카드 공통 ─────────────────────────────────────────── */
.card{background:var(--black-1);border:1px solid var(--hairline);border-radius:2px;
  padding:clamp(24px,3vw,38px);transition:border-color .3s var(--ease),transform .3s var(--ease)}
.card:hover{border-color:var(--hairline-strong);transform:translateY(-2px)}

/* ── 푸터 ──────────────────────────────────────────────── */
.site-footer{background:#000;border-top:1px solid var(--hairline);position:relative;overflow:hidden}
.site-footer .container{position:relative;z-index:1;padding-block:var(--section-pad)}
.footer-brand{font-family:var(--font-latin);font-style:italic;font-size:clamp(1.8rem,4vw,2.6rem);
  color:var(--ivory)}
.footer-tag{font-family:var(--font-serif);font-size:clamp(1.2rem,2.6vw,1.6rem);color:var(--gold);
  margin-top:18px;line-height:1.6}
.footer-cta{margin-top:34px}
.footer-nav{display:flex;flex-wrap:wrap;gap:16px 32px;margin-top:64px;padding-top:28px;
  border-top:1px solid var(--hairline)}
.footer-nav a{font-size:.9rem;color:var(--ivory-dim)}
.footer-nav a:hover{color:var(--gold)}
.footer-legal{display:flex;flex-wrap:wrap;gap:12px 24px;margin-top:18px}
.footer-legal a{font-size:.78rem;color:var(--ivory-faint)}
.footer-legal a:hover{color:var(--gold)}
.footer-biz{margin-top:22px;font-size:.76rem;color:var(--ivory-faint);line-height:1.9}
.footer-copy{margin-top:22px;font-size:.76rem;color:var(--ivory-faint)}

/* ── 준비중 안내 페이지 공통 ───────────────────────────── */
.stub-main{min-height:60vh;display:flex;align-items:center}
.stub-main .container{max-width:720px}
.stub-main h1{font-family:var(--font-serif);font-size:clamp(1.6rem,4vw,2.3rem);color:var(--ivory)}
.stub-main p{margin-top:18px;color:var(--ivory-dim);line-height:1.9}
.stub-main .btn{margin-top:34px}