/* ═══════════════════════════════════════════════════
   Multilingual Comprehensive Guide CSS — Seoul BD Dental
   Used by: /jp/guide/*, /en/guide/*, /cn/guide/*
   Design: Dark hero + Gold accents, encyclopedia layout
   ═══════════════════════════════════════════════════ */

:root{
  --gold:#C9A042;
  --gold-light:#E8C252;
  --gold-dark:#8B6914;
  --brown:#6B4226;
  --dark:#1a1917;
  --dark-2:#2d2926;
  --bg:#FAFAF7;
  --bg-2:#f5f4f1;
  --white:#fff;
  --text:#2D2A26;
  --text-light:#6B6560;
  --text-muted:#8a8580;
  --border:#e8e6e0;
  --radius:16px;
  --radius-sm:10px;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:'Pretendard',-apple-system,BlinkMacSystemFont,sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.75;
  font-size:16px;
}

/* ═══ HERO ═══ */
.guide-hero{
  background:linear-gradient(135deg,#1a1917 0%,#2d2926 50%,#1a1a2e 100%);
  color:#fff;
  padding:90px 20px 70px;
  text-align:center;
  position:relative;
  overflow:hidden;
}
.guide-hero::before{
  content:'';
  position:absolute;
  top:-100px;
  right:-100px;
  width:400px;
  height:400px;
  background:radial-gradient(circle,rgba(201,160,66,.12),transparent 70%);
  border-radius:50%;
}
.guide-hero__inner{position:relative;z-index:1;max-width:880px;margin:0 auto}
.guide-hero__badge{
  display:inline-block;
  padding:6px 18px;
  background:rgba(201,160,66,.15);
  border:1px solid rgba(201,160,66,.35);
  border-radius:999px;
  font-size:.78rem;
  color:var(--gold-light);
  font-weight:700;
  letter-spacing:.12em;
  margin-bottom:22px;
}
.guide-hero h1{
  font-size:clamp(1.85rem,4.5vw,2.8rem);
  font-weight:900;
  margin-bottom:16px;
  letter-spacing:-.02em;
  line-height:1.25;
}
.guide-hero h1 .keyword{
  background:linear-gradient(135deg,var(--gold-light),var(--gold));
  -webkit-background-clip:text;
  -webkit-text-fill-color:transparent;
  background-clip:text;
}
.guide-hero__sub{
  font-size:1.05rem;
  color:rgba(255,255,255,.78);
  max-width:680px;
  margin:0 auto 28px;
  line-height:1.7;
}
.guide-hero__meta{
  display:flex;
  justify-content:center;
  flex-wrap:wrap;
  gap:18px;
  font-size:.82rem;
  color:rgba(255,255,255,.55);
  margin-top:24px;
}
.guide-hero__meta span{display:inline-flex;align-items:center;gap:6px}
.guide-hero__meta i{color:var(--gold)}

/* ═══ CONTAINER ═══ */
.guide-container{
  max-width:880px;
  margin:0 auto;
  padding:0 24px;
}

/* ═══ TOC ═══ */
.guide-toc{
  background:var(--white);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:28px 32px;
  margin:40px auto;
  max-width:880px;
  box-shadow:0 4px 20px rgba(0,0,0,.03);
}
.guide-toc__title{
  font-size:.78rem;
  font-weight:800;
  letter-spacing:.15em;
  color:var(--gold-dark);
  margin-bottom:18px;
  text-transform:uppercase;
}
.guide-toc__list{
  list-style:none;
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(240px,1fr));
  gap:8px 24px;
}
.guide-toc__list a{
  display:flex;
  align-items:center;
  gap:10px;
  padding:8px 0;
  color:var(--text);
  text-decoration:none;
  font-size:.92rem;
  transition:color .2s;
}
.guide-toc__list a:hover{color:var(--gold-dark)}
.guide-toc__num{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:24px;
  height:24px;
  background:var(--bg-2);
  color:var(--gold-dark);
  border-radius:50%;
  font-size:.72rem;
  font-weight:800;
  flex-shrink:0;
}

/* ═══ SECTIONS ═══ */
.guide-section{
  padding:48px 0;
  border-top:1px solid var(--border);
}
.guide-section:first-of-type{border-top:none}
.guide-section h2{
  font-size:clamp(1.4rem,3vw,1.8rem);
  font-weight:800;
  color:var(--text);
  margin-bottom:24px;
  letter-spacing:-.01em;
  display:flex;
  align-items:center;
  gap:14px;
}
.sec-num{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:36px;
  height:36px;
  background:linear-gradient(135deg,var(--gold),var(--gold-dark));
  color:#fff;
  border-radius:50%;
  font-size:.88rem;
  font-weight:800;
  flex-shrink:0;
}
.guide-section h3{
  font-size:1.18rem;
  font-weight:700;
  color:var(--text);
  margin:28px 0 14px;
  letter-spacing:-.01em;
}
.guide-section h4{
  font-size:1.02rem;
  font-weight:700;
  color:var(--brown);
  margin:20px 0 10px;
}
.guide-section p{
  margin-bottom:14px;
  color:var(--text);
  font-size:.98rem;
}
.guide-section p.lead{
  font-size:1.05rem;
  color:var(--text-light);
  line-height:1.8;
}
.guide-section ul,.guide-section ol{
  margin:14px 0 18px 0;
  padding-left:24px;
}
.guide-section li{
  margin-bottom:8px;
  color:var(--text);
}
.guide-section strong{color:var(--brown);font-weight:700}

/* ═══ TABLES ═══ */
.compare-table{
  width:100%;
  border-collapse:collapse;
  margin:20px 0;
  font-size:.92rem;
  background:var(--white);
  border-radius:var(--radius-sm);
  overflow:hidden;
  box-shadow:0 2px 12px rgba(0,0,0,.04);
}
.compare-table thead{background:linear-gradient(135deg,var(--dark),var(--dark-2))}
.compare-table th{
  padding:14px 12px;
  color:#fff;
  font-weight:700;
  text-align:left;
  font-size:.85rem;
  letter-spacing:.02em;
}
.compare-table td{
  padding:13px 12px;
  border-bottom:1px solid var(--border);
  color:var(--text);
}
.compare-table tbody tr:hover{background:var(--bg-2)}
.compare-table tbody tr:last-child td{border-bottom:none}

/* ═══ INFO BOXES ═══ */
.info-box{
  background:linear-gradient(135deg,#fef8e7,#fef3d0);
  border-left:4px solid var(--gold);
  padding:18px 22px;
  border-radius:0 var(--radius-sm) var(--radius-sm) 0;
  margin:20px 0;
}
.info-box.warning{
  background:linear-gradient(135deg,#fef3e7,#fee8d0);
  border-left-color:#f59e0b;
}
.info-box.safety{
  background:linear-gradient(135deg,#e7f3ff,#d0e8ff);
  border-left-color:#3b82f6;
}
.info-box strong{
  display:block;
  margin-bottom:6px;
  font-size:.95rem;
  color:var(--text);
}
.info-box p{font-size:.92rem;color:var(--text-light);margin:0}

/* ═══ GLOWNATE PROMO BOX ═══ */
.glow-promo{
  background:linear-gradient(135deg,#1a1917 0%,#2d2926 100%);
  color:#fff;
  border-radius:var(--radius);
  padding:32px 28px;
  margin:32px 0;
  position:relative;
  overflow:hidden;
}
.glow-promo::before{
  content:'NEW';
  position:absolute;
  top:16px;
  right:16px;
  background:var(--gold);
  color:var(--dark);
  font-size:.7rem;
  font-weight:800;
  padding:4px 10px;
  border-radius:999px;
  letter-spacing:.1em;
}
.glow-promo h3{
  color:var(--gold-light);
  margin:0 0 10px;
  font-size:1.3rem;
  font-weight:800;
}
.glow-promo p{
  color:rgba(255,255,255,.85);
  margin:0;
  font-size:.98rem;
  line-height:1.7;
}

/* ═══ FAQ ═══ */
.faq-guide{
  border:1px solid var(--border);
  border-radius:var(--radius-sm);
  margin-bottom:12px;
  background:var(--white);
  overflow:hidden;
}
.faq-guide summary{
  padding:18px 24px;
  font-weight:700;
  font-size:.96rem;
  cursor:pointer;
  list-style:none;
  background:var(--white);
  color:var(--text);
  display:flex;
  align-items:center;
  gap:12px;
  transition:background .2s;
}
.faq-guide summary::-webkit-details-marker{display:none}
.faq-guide summary::after{
  content:'+';
  margin-left:auto;
  font-size:1.4rem;
  color:var(--gold);
  font-weight:300;
  transition:transform .2s;
}
.faq-guide[open] summary{background:var(--bg-2)}
.faq-guide[open] summary::after{content:'−'}
.faq-guide summary:hover{background:var(--bg-2)}
.faq-body{
  padding:18px 24px 22px;
  font-size:.94rem;
  color:var(--text-light);
  line-height:1.75;
  background:var(--bg);
  border-top:1px solid var(--border);
}

/* ═══ AUTHOR / CITATIONS ═══ */
.author-box{
  background:var(--bg-2);
  border-radius:var(--radius);
  padding:24px 28px;
  margin:40px 0;
  border:1px solid var(--border);
}
.author-box h4{
  font-size:.8rem;
  color:var(--gold-dark);
  letter-spacing:.12em;
  font-weight:800;
  margin-bottom:10px;
  text-transform:uppercase;
}
.author-box p{
  font-size:.92rem;
  color:var(--text-light);
  margin:0;
}
.citations{
  font-size:.84rem;
  color:var(--text-muted);
  background:var(--bg-2);
  padding:14px 18px;
  border-radius:var(--radius-sm);
  margin-top:14px;
  border-left:3px solid var(--gold);
}

/* ═══ CTA BANNER ═══ */
.cta-banner{
  background:linear-gradient(135deg,var(--dark),var(--dark-2));
  color:#fff;
  border-radius:var(--radius);
  padding:38px 32px;
  text-align:center;
  margin:48px 0;
}
.cta-banner h3{
  color:#fff;
  font-size:1.4rem;
  font-weight:800;
  margin-bottom:12px;
}
.cta-banner p{
  color:rgba(255,255,255,.78);
  margin-bottom:22px;
  font-size:.98rem;
}
.cta-banner__btns{
  display:flex;
  flex-wrap:wrap;
  justify-content:center;
  gap:12px;
}
.cta-banner__btn{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:13px 26px;
  background:linear-gradient(135deg,var(--gold),var(--gold-dark));
  color:#fff;
  text-decoration:none;
  border-radius:999px;
  font-weight:700;
  font-size:.92rem;
  transition:transform .2s;
}
.cta-banner__btn:hover{transform:translateY(-2px)}
.cta-banner__btn.secondary{
  background:rgba(255,255,255,.1);
  border:1px solid rgba(255,255,255,.25);
}

/* ═══ RELATED LINKS ═══ */
.related-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(240px,1fr));
  gap:14px;
  margin:24px 0;
}
.related-link{
  display:block;
  padding:18px 20px;
  background:var(--white);
  border:1px solid var(--border);
  border-radius:var(--radius-sm);
  text-decoration:none;
  color:var(--text);
  transition:all .2s;
}
.related-link:hover{
  border-color:var(--gold);
  transform:translateY(-2px);
  box-shadow:0 6px 20px rgba(201,160,66,.15);
}
.related-link strong{display:block;font-size:.98rem;margin-bottom:4px;color:var(--brown)}
.related-link span{font-size:.84rem;color:var(--text-muted)}

/* ═══ LANGUAGE SWITCHER ═══ */
.lang-switch{
  display:flex;
  justify-content:center;
  gap:10px;
  margin:24px 0;
  flex-wrap:wrap;
}
.lang-switch a{
  padding:6px 14px;
  background:var(--white);
  border:1px solid var(--border);
  border-radius:999px;
  font-size:.82rem;
  color:var(--text-light);
  text-decoration:none;
  transition:all .2s;
}
.lang-switch a:hover,.lang-switch a.active{
  background:var(--dark);
  color:var(--gold-light);
  border-color:var(--dark);
}

/* ═══ TOP NAV ═══ */
.guide-nav{
  background:var(--white);
  border-bottom:1px solid var(--border);
  padding:14px 24px;
  position:sticky;
  top:0;
  z-index:50;
  box-shadow:0 1px 8px rgba(0,0,0,.03);
}
.guide-nav__inner{
  max-width:1100px;
  margin:0 auto;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:20px;
}
.guide-nav__logo{
  font-weight:800;
  font-size:1rem;
  color:var(--dark);
  text-decoration:none;
  display:flex;
  align-items:center;
  gap:8px;
}
.guide-nav__logo i{color:var(--gold)}
.guide-nav__links{display:flex;gap:18px;align-items:center}
.guide-nav__links a{
  font-size:.88rem;
  color:var(--text-light);
  text-decoration:none;
  font-weight:600;
}
.guide-nav__links a:hover{color:var(--gold-dark)}

/* ═══ FOOTER ═══ */
.guide-footer{
  background:var(--dark);
  color:rgba(255,255,255,.7);
  padding:50px 24px 30px;
  margin-top:60px;
  text-align:center;
}
.guide-footer__inner{max-width:880px;margin:0 auto}
.guide-footer h4{
  color:var(--gold-light);
  font-size:1.05rem;
  margin-bottom:14px;
}
.guide-footer p{font-size:.88rem;margin-bottom:10px;line-height:1.7}
.guide-footer a{color:var(--gold-light);text-decoration:none}
.guide-footer__legal{
  margin-top:24px;
  padding-top:20px;
  border-top:1px solid rgba(255,255,255,.1);
  font-size:.78rem;
  color:rgba(255,255,255,.4);
}

/* ═══ RESPONSIVE ═══ */
@media (max-width: 768px){
  .guide-hero{padding:70px 18px 50px}
  .guide-section{padding:36px 0}
  .guide-section h2{font-size:1.35rem;gap:10px}
  .sec-num{width:32px;height:32px;font-size:.8rem}
  .guide-toc{padding:22px 20px;margin:32px 16px}
  .compare-table{font-size:.84rem}
  .compare-table th,.compare-table td{padding:10px 8px}
  .glow-promo{padding:24px 20px}
  .cta-banner{padding:30px 22px}
  .guide-nav__links a:not(:last-child){display:none}
}

/* ═══ HUB PAGE SPECIFIC ═══ */
.hub-stats{
  display:flex;
  justify-content:center;
  gap:40px;
  margin:24px 0;
  flex-wrap:wrap;
}
.hub-stat{text-align:center}
.hub-stat__num{
  font-size:1.8rem;
  font-weight:900;
  color:var(--gold-light);
  display:block;
}
.hub-stat__label{
  font-size:.82rem;
  color:rgba(255,255,255,.6);
  margin-top:4px;
  display:block;
}
.hub-cards{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(300px,1fr));
  gap:24px;
  margin:40px 0;
}
.hub-card{
  display:block;
  background:var(--white);
  border:1px solid var(--border);
  border-radius:var(--radius);
  overflow:hidden;
  text-decoration:none;
  color:inherit;
  transition:all .3s;
  box-shadow:0 4px 20px rgba(0,0,0,.04);
}
.hub-card:hover{
  transform:translateY(-4px);
  box-shadow:0 12px 32px rgba(0,0,0,.1);
  border-color:var(--gold);
}
.hub-card__top{
  background:linear-gradient(135deg,var(--dark),var(--dark-2));
  padding:32px 28px;
  position:relative;
}
.hub-card__num{
  position:absolute;
  top:18px;
  right:18px;
  background:var(--gold);
  color:var(--dark);
  font-size:.68rem;
  font-weight:800;
  padding:4px 10px;
  border-radius:999px;
  letter-spacing:.1em;
}
.hub-card__icon{font-size:2.5rem;margin-bottom:12px}
.hub-card__top h3{
  color:#fff;
  font-size:1.4rem;
  font-weight:800;
  margin:0 0 6px;
  letter-spacing:-.01em;
}
.hub-card__sub{
  color:var(--gold-light);
  font-size:.88rem;
  font-weight:600;
  margin:0;
}
.hub-card__body{padding:22px 28px}
.hub-card__body p{
  font-size:.94rem;
  color:var(--text-light);
  line-height:1.7;
  margin:0 0 14px;
}
.hub-card__tags{
  display:flex;
  flex-wrap:wrap;
  gap:6px;
  margin-bottom:14px;
}
.hub-card__tags span{
  font-size:.74rem;
  background:var(--bg-2);
  color:var(--text-light);
  padding:4px 10px;
  border-radius:999px;
}
.hub-card__arrow{
  color:var(--gold-dark);
  font-weight:700;
  font-size:.92rem;
  display:flex;
  align-items:center;
  gap:8px;
}