/* ============================================================
   봉봉 줄기세포 연구소 · 항노화면역클리닉
   공통 스타일시트
   ============================================================ */

:root{
  --ink:#2d2d2d;
  --ink-2:#4a4340;
  --muted:#776e68;
  --muted-2:#9a9089;
  --paper:#f8f5f2;
  --paper-2:#f0ece5;
  --cream:#ead8cb;
  --rose:#c5a99a;
  --terra:#9d7d6f;
  --terra-dark:#7d5f52;
  --charcoal:#2f2a27;
  --line:#e8ded8;
  --line-2:#d8cec7;
  --max:1180px;
  --serif: Georgia,'Nanum Myeongjo',serif;
  --sans: Pretendard,'Noto Sans KR','Apple SD Gothic Neo',Arial,sans-serif;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  color:var(--ink);
  background:var(--paper);
  font-family:var(--sans);
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img,svg{max-width:100%;height:auto}

/* ---------- Top bar & Nav ---------- */
.top{height:5px;background:linear-gradient(90deg,#9d7d6f,#c5a99a,#ead8cb)}

.nav{
  max-width:var(--max);margin:auto;height:76px;
  display:flex;align-items:center;justify-content:space-between;
  padding:0 24px;position:relative;
}
.logo{font-weight:800;letter-spacing:-.04em;font-size:20px}
.logo small{
  display:block;font-size:9px;letter-spacing:.2em;
  color:var(--muted);font-weight:500;margin-top:2px;
}
.links{display:flex;gap:26px;font-size:13px;color:#52606a;align-items:center}
.links a{padding:6px 2px;border-bottom:1px solid transparent;transition:.2s}
.links a:hover{color:var(--terra);border-bottom-color:var(--terra)}
.links a.cta{color:var(--terra);font-weight:700}
.links a.active{color:var(--terra);border-bottom-color:var(--terra)}

.menu-toggle{
  display:none;border:0;background:transparent;
  color:var(--terra);font:700 12px inherit;letter-spacing:.08em;
  min-width:44px;min-height:44px;cursor:pointer;
}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;padding:13px 22px;
  border-radius:99px;background:var(--terra);color:#fff;
  font-size:13px;font-weight:600;margin-right:8px;
  min-height:44px;transition:.2s;letter-spacing:.02em;
}
.btn:hover{background:var(--terra-dark)}
.btn.alt{background:transparent;color:var(--terra);border:1px solid var(--rose)}
.btn.alt:hover{background:var(--terra);color:#fff;border-color:var(--terra)}
.btn.light{background:var(--cream);color:var(--ink)}
.btn.light:hover{background:#dbc4b3}

/* ---------- Common containers ---------- */
.wrap{max-width:var(--max);margin:auto}
.eyebrow{
  font-size:11px;letter-spacing:.18em;color:var(--terra);
  font-weight:700;text-transform:uppercase;
}
.kicker{font-size:12px;color:var(--muted);letter-spacing:.12em}
.section-title{
  font-family:var(--serif);font-weight:400;
  font-size:40px;line-height:1.25;letter-spacing:-.05em;
  margin:10px 0 20px;
}

/* ---------- Program detail page ---------- */
.program-hero{
  padding:96px 24px 72px;
  background:linear-gradient(180deg,#fbf7f2 0%,var(--paper) 100%);
  border-bottom:1px solid var(--line);
}
.program-hero .wrap{display:grid;grid-template-columns:1fr 1fr;gap:70px;align-items:start;min-height:520px}
.crumb{font-size:12px;color:var(--muted);letter-spacing:.06em;margin-bottom:22px}
.crumb a{color:var(--muted)}
.crumb a:hover{color:var(--terra)}
.program-num{
  font-family:var(--serif);font-size:80px;color:var(--rose);
  line-height:1;letter-spacing:-.06em;margin-bottom:10px;
}
.program-hero h1{
  font-family:var(--serif);font-weight:400;
  font-size:clamp(40px,4.5vw,58px);line-height:1.2;letter-spacing:-.05em;
  margin:12px 0 20px;
}
.program-hero h1 em{font-style:normal;color:var(--terra)}
.program-hero .lead{font-size:16px;color:var(--ink-2);max-width:520px}

.program-visual{
  aspect-ratio:1/1;
  background:linear-gradient(150deg,var(--cream) 0%,var(--rose) 55%,var(--terra) 100%);
  box-shadow:0 25px 60px rgba(157,125,111,.2);
  position:relative;overflow:hidden;
}
.program-visual img{
  display:block;width:100%;height:100%;object-fit:cover;
  filter:contrast(1.02) saturate(0.95);
}
.program-visual::after{
  content:attr(data-label);
  position:absolute;bottom:24px;left:26px;color:rgba(255,255,255,.92);
  font-size:10px;letter-spacing:.24em;font-weight:600;
  text-shadow:0 2px 10px rgba(0,0,0,.35);
  z-index:2;
}

/* body sections in program page */
.section{padding:88px 24px;border-bottom:1px solid var(--line)}
.section.tone{background:#fff}
.section.dark{background:var(--charcoal);color:#e4dcd6;border-bottom:0}
.section.dark .section-title{color:#fff}
.section.dark .kicker{color:var(--cream)}
.section.dark p{color:#c5bcb5}

.two-col{display:grid;grid-template-columns:.85fr 1.15fr;gap:80px;align-items:start}
.two-col h2{margin-top:0}
.two-col p{color:var(--muted);font-size:16px;margin:0 0 16px}

/* Feature grid (효과 리스트) */
.features{display:grid;grid-template-columns:repeat(2,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}
.feature{background:#fff;padding:34px 28px}
.feature .n{font-family:var(--serif);color:var(--terra);font-size:14px;letter-spacing:.02em;margin-bottom:10px}
.feature h3{font-size:19px;margin:0 0 8px;letter-spacing:-.03em}
.feature p{margin:0;color:var(--muted);font-size:14px;line-height:1.7}

.section.dark .features{background:rgba(255,255,255,.12);border-color:rgba(255,255,255,.15)}
.section.dark .feature{background:transparent;border:1px solid rgba(255,255,255,.08)}
.section.dark .feature h3{color:#fff}
.section.dark .feature p{color:#c5bcb5}
.section.dark .feature .n{color:var(--cream)}

/* Points list — 차별성/특징 */
.points{list-style:none;padding:0;margin:0;display:grid;gap:20px}
.points li{
  padding:22px 26px;background:var(--paper-2);border-left:3px solid var(--terra);
}
.points li b{display:block;font-size:15px;margin-bottom:6px;letter-spacing:-.02em}
.points li span{font-size:14px;color:var(--muted);line-height:1.7}

/* ---------- CTA block ---------- */
.cta-band{
  padding:82px 24px;text-align:center;background:#fff;
  border-top:1px solid var(--line);
}
.cta-band h2{font:400 clamp(30px,3.5vw,44px)/1.25 var(--serif);letter-spacing:-.04em;margin:0 0 14px}
.cta-band p{color:var(--muted);margin:0 0 26px;font-size:15px}

/* ---------- Footer ---------- */
.footer{
  background:#172530;color:#b9c5c8;padding:44px 24px;font-size:12px;
}
.footer .wrap{
  display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:40px;
}
.footer strong{color:#fff;font-size:14px;letter-spacing:-.02em}
.footer small{display:block;margin-top:6px;color:#8b9aa0;font-size:11px}
.footer a{color:#b9c5c8}
.footer a:hover{color:#fff}

/* ---------- Related programs ---------- */
.related{padding:72px 24px;background:var(--paper-2)}
.related h3{font:400 26px/1.3 var(--serif);letter-spacing:-.03em;margin:0 0 24px}
.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.related-card{
  background:#fff;border:1px solid var(--line);padding:24px 22px;
  transition:.2s;display:flex;flex-direction:column;justify-content:space-between;min-height:150px;
}
.related-card:hover{border-color:var(--terra);transform:translateY(-2px)}
.related-card .n{font-family:var(--serif);color:var(--rose);font-size:13px}
.related-card h4{font-size:17px;margin:12px 0 0;letter-spacing:-.03em}
.related-card span{font-size:12px;color:var(--terra);margin-top:14px;font-weight:600}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width:1024px){
  .nav{padding:0 28px}
  .program-hero .wrap{gap:50px}
  .two-col{gap:48px}
}

@media (max-width:800px){
  .nav{height:68px}
  .menu-toggle{display:inline-flex;align-items:center;justify-content:center}
  .links{
    display:none;position:absolute;z-index:20;
    top:68px;left:16px;right:16px;padding:10px;
    background:#fff;border:1px solid var(--line);
    box-shadow:0 18px 35px rgba(45,45,45,.12);
    flex-direction:column;gap:0;
  }
  .links.open{display:flex}
  .links a{
    display:flex;padding:12px 14px;border-bottom:1px solid var(--line);
    width:100%;
  }
  .links a:last-child{border-bottom:0}

  .program-hero{padding:68px 24px 56px}
  .program-hero .wrap{grid-template-columns:1fr;gap:36px}
  .program-visual{max-width:380px;margin:0 auto;width:100%}
  .program-num{font-size:60px}

  .section{padding:64px 24px}
  .two-col{grid-template-columns:1fr;gap:28px}
  .features{grid-template-columns:1fr}
  .related-grid{grid-template-columns:1fr 1fr}
  .footer .wrap{grid-template-columns:1fr;gap:24px}
}

@media (max-width:480px){
  .nav{padding:0 18px}
  .program-hero{padding:56px 18px 44px}
  .section{padding:56px 18px}
  .cta-band{padding:60px 18px}
  .related{padding:56px 18px}
  .related-grid{grid-template-columns:1fr}
  .footer{padding:36px 18px}
  .btn{width:100%;justify-content:center;margin:5px 0}
  .section-title{font-size:32px}
  .features .feature{padding:26px 22px}
}


/* ============================================================
   Provenance block — Source & Medical Reviewer (GEO/E-E-A-T)
   ============================================================ */
.provenance{
  padding:56px 24px;background:var(--paper-2);
  border-top:1px solid var(--line);border-bottom:1px solid var(--line);
}
.prov-grid{
  display:grid;grid-template-columns:repeat(3,1fr);gap:1px;
  background:var(--line);border:1px solid var(--line);
}
.prov-block{
  background:#fff;padding:24px 26px;
}
.prov-label{
  font-size:10px;letter-spacing:.22em;color:var(--terra);
  font-weight:700;text-transform:uppercase;margin-bottom:12px;
}
.prov-block p{
  color:var(--muted);font-size:13px;line-height:1.75;margin:0;
}
.prov-block a{color:var(--terra);border-bottom:1px solid transparent;transition:.2s}
.prov-block a:hover{border-bottom-color:var(--terra)}
.prov-block strong{color:var(--ink)}
@media (max-width:800px){
  .prov-grid{grid-template-columns:1fr}
  .provenance{padding:48px 24px}
}
@media (max-width:480px){
  .provenance{padding:40px 18px}
  .prov-block{padding:22px}
}