/* l5.rebom.click — 척추 5번 정보 사이트 스타일 */
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:80px}
html,body{margin:0;padding:0}

:root{
  --c-primary: #0e7490;
  --c-primary-2: #06b6d4;
  --c-accent: #fde68a;
  --c-text: #0f172a;
  --c-sub: #475569;
  --c-muted: #94a3b8;
  --c-card: #ffffff;
  --c-bg: #f8fafc;
  --c-border: #e2e8f0;
  --c-hot: #f97316;
  --c-alarm: #dc2626;
  --shadow-card: 0 4px 24px rgba(15,23,42,.06), 0 1px 2px rgba(15,23,42,.04);
  --shadow-lg: 0 10px 40px rgba(15,23,42,.12);
  --radius: 16px;
}

body{
  font-family:-apple-system,BlinkMacSystemFont,'Segoe UI','Pretendard','Noto Sans KR',sans-serif;
  color:var(--c-text);
  background:var(--c-bg);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  word-break:keep-all;
}

.wrap{max-width:1100px;margin:0 auto;padding:0 24px}

/* ── 상단바 ── */
.topbar{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.92);
  backdrop-filter:blur(20px) saturate(180%);
  border-bottom:1px solid var(--c-border);
}
.topbar-inner{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  height:64px;
}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--c-text)}
.brand-glyph{
  width:38px;height:38px;border-radius:10px;
  background:linear-gradient(135deg,var(--c-primary-2),var(--c-primary));
  color:#fff;font-weight:800;font-size:.95rem;letter-spacing:.05em;
  display:flex;align-items:center;justify-content:center;
  box-shadow:0 4px 12px rgba(14,116,144,.3);
}
.brand-text{font-weight:700;letter-spacing:-.01em;font-size:1rem}
.brand-text small{display:block;font-weight:500;color:var(--c-sub);font-size:.72rem;letter-spacing:.02em;margin-top:2px}

.topnav{display:flex;gap:4px}
.topnav a{
  text-decoration:none;color:var(--c-sub);
  padding:8px 12px;border-radius:8px;
  font-size:.88rem;font-weight:500;
  transition:all .15s;
}
.topnav a:hover{background:#ecfeff;color:var(--c-primary)}

.menu-toggle{
  display:none;border:0;background:transparent;
  font-size:1.4rem;cursor:pointer;color:var(--c-sub);
  padding:6px 10px;border-radius:8px;
}
.menu-toggle:hover{background:#f1f5f9}

/* ── HERO ── */
.hero{
  background:
    radial-gradient(800px 400px at 20% -10%, rgba(6,182,212,.18), transparent 60%),
    radial-gradient(700px 400px at 100% 0%, rgba(14,116,144,.15), transparent 60%),
    linear-gradient(180deg,#ecfeff 0%, #f8fafc 100%);
  padding:60px 0 50px;
  border-bottom:1px solid var(--c-border);
}
.hero-inner{display:grid;grid-template-columns:1.4fr 1fr;gap:50px;align-items:center}

.kicker{
  display:inline-block;
  padding:6px 14px;border-radius:999px;
  background:rgba(14,116,144,.1);color:var(--c-primary);
  font-size:.78rem;font-weight:700;letter-spacing:.06em;
  margin-bottom:18px;
}
.hero h1{
  font-size:clamp(2.2rem, 4.5vw, 3.2rem);
  font-weight:800;
  letter-spacing:-.03em;
  line-height:1.15;
  margin:0 0 20px;
}
.lead{
  font-size:1.1rem;color:var(--c-sub);line-height:1.7;margin:0 0 24px;
}
.lead strong{color:var(--c-text);font-weight:700}
.hero-tags{display:flex;flex-wrap:wrap;gap:8px}
.tag{
  padding:7px 13px;border-radius:8px;
  background:#fff;border:1px solid var(--c-border);
  font-size:.82rem;font-weight:500;color:var(--c-sub);
}

.spine-vis{
  position:relative;
  background:#fff;border-radius:24px;padding:24px;
  box-shadow:var(--shadow-card);
  border:1px solid var(--c-border);
  text-align:center;
}
.spine-vis svg{width:100%;max-width:200px;height:auto;display:block;margin:0 auto}
.vis-cap{font-size:.78rem;color:var(--c-muted);margin-top:8px;line-height:1.4}
.l5-block{animation:pulse 2.4s ease-in-out infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.78}}

/* ── 콘텐츠 ── */
.content{padding:50px 24px 60px;display:flex;flex-direction:column;gap:24px}

.card{
  background:var(--c-card);
  border-radius:var(--radius);
  padding:36px;
  box-shadow:var(--shadow-card);
  border:1px solid var(--c-border);
  scroll-margin-top:90px;
}

.card h2{
  display:flex;align-items:center;gap:14px;
  font-size:1.5rem;font-weight:800;
  margin:0 0 24px;letter-spacing:-.02em;
}
.card h2 .num{
  display:inline-flex;align-items:center;justify-content:center;
  width:38px;height:38px;border-radius:10px;
  background:linear-gradient(135deg,var(--c-primary-2),var(--c-primary));
  color:#fff;font-size:.85rem;font-weight:800;letter-spacing:.05em;
}
.card h2 .num.alarm{background:linear-gradient(135deg,#f87171,var(--c-alarm));font-size:1.2rem}

.card h3{
  font-size:1.05rem;font-weight:700;margin:0 0 10px;letter-spacing:-.01em;
}
.card h3.sub{color:var(--c-primary);font-size:.95rem;text-transform:uppercase;letter-spacing:.04em;margin-bottom:12px}
.card p{margin:0 0 12px;color:var(--c-sub)}
.card p:last-child{margin-bottom:0}
.card code{
  background:#f1f5f9;padding:1px 7px;border-radius:5px;
  font-family:'SF Mono','Monaco','Consolas',monospace;font-size:.88em;color:var(--c-primary);
}
.card em{font-style:normal;color:var(--c-primary);font-weight:600}

.bullet{margin:0 0 12px;padding-left:20px}
.bullet li{margin-bottom:6px;color:var(--c-sub)}
.bullet li strong{color:var(--c-text)}
.bullet:last-child{margin-bottom:0}

.hint{
  margin-top:12px;padding:12px 16px;
  background:#ecfeff;border-left:3px solid var(--c-primary-2);
  border-radius:6px;font-size:.92rem;color:var(--c-primary)
}

/* 그리드 */
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:30px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}

.mini{
  padding:20px;border-radius:12px;
  background:#f8fafc;border:1px solid var(--c-border);
  transition:all .2s;
}
.mini:hover{background:#fff;border-color:var(--c-primary-2);transform:translateY(-2px);box-shadow:var(--shadow-card)}
.mini-icon{font-size:1.6rem;margin-bottom:10px;display:block}
.mini h3{margin-bottom:8px;font-size:1rem}
.mini p{font-size:.9rem;line-height:1.55;margin:0}

/* 질환 */
.disease-list{display:grid;grid-template-columns:1fr;gap:14px}
.disease{
  padding:20px 22px;border-radius:12px;
  background:#fefce8;border:1px solid #fde68a;
  position:relative;
}
.disease h3{margin:0 0 8px;display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.disease p{margin:0;font-size:.95rem;color:#713f12}
.disease p strong{color:#451a03}

.badge{
  display:inline-block;padding:2px 9px;border-radius:999px;
  font-size:.68rem;font-weight:700;letter-spacing:.04em;
  background:var(--c-primary-2);color:#fff;
}
.badge.hot{background:var(--c-hot)}

/* 운동 */
.exercise-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:14px}
.ex{
  padding:22px;border-radius:14px;
  background:linear-gradient(135deg,#ecfeff 0%,#f0fdfa 100%);
  border:1px solid #cffafe;
  transition:all .2s;
}
.ex:hover{transform:translateY(-2px);box-shadow:var(--shadow-card)}
.ex-tag{
  display:inline-block;padding:3px 10px;border-radius:6px;
  background:var(--c-primary);color:#fff;
  font-size:.7rem;font-weight:700;letter-spacing:.05em;
  margin-bottom:12px;
}
.ex h3{margin:0 0 8px;font-size:1.05rem}
.ex p{font-size:.9rem;color:var(--c-sub);margin:0;line-height:1.55}

/* 알람 카드 */
.alarm-card{
  background:linear-gradient(135deg,#fef2f2 0%,#fff5f5 100%);
  border:2px solid #fecaca;
}
.alarm-list{padding-left:0;list-style:none;margin-bottom:16px}
.alarm-list li{
  position:relative;padding:10px 12px 10px 36px;
  background:#fff;border-radius:8px;margin-bottom:8px;
  border-left:3px solid var(--c-alarm);
}
.alarm-list li::before{
  content:'⚠';position:absolute;left:10px;top:10px;
  color:var(--c-alarm);font-weight:bold;
}
.alarm-foot{
  margin:0;padding:14px 18px;
  background:rgba(220,38,38,.08);border-radius:10px;
  color:#7f1d1d;font-weight:500;
}
.alarm-foot strong{color:var(--c-alarm)}

.muted{color:var(--c-muted);font-size:.92rem}
.small{font-size:.82rem}

/* ── 푸터 ── */
.footer{
  background:#0f172a;color:#cbd5e1;
  padding:40px 24px;margin-top:40px;
}
.footer-inner{
  display:flex;justify-content:space-between;align-items:flex-start;gap:30px;flex-wrap:wrap;
}
.footer strong{color:#fff;font-size:1.05rem;display:block;margin-bottom:8px}
.footer .muted{color:#94a3b8}
.footer-meta{text-align:right;font-size:.82rem;color:#94a3b8;line-height:1.7}

/* ── 반응형 ── */
@media (max-width:880px){
  .hero{padding:40px 0 36px}
  .hero-inner{grid-template-columns:1fr;gap:36px}
  .spine-vis{max-width:280px;margin:0 auto}

  .topnav{
    display:none;
    position:absolute;top:64px;left:0;right:0;
    background:#fff;border-bottom:1px solid var(--c-border);
    flex-direction:column;padding:8px;gap:0;
    box-shadow:var(--shadow-lg);
  }
  .topnav.open{display:flex}
  .topnav a{padding:12px 16px;border-radius:0}
  .menu-toggle{display:block}

  .card{padding:24px}
  .card h2{font-size:1.25rem}
  .grid-2,.grid-3,.exercise-grid{grid-template-columns:1fr;gap:14px}

  .footer-inner{flex-direction:column}
  .footer-meta{text-align:left}
}