/* ============================================================
   IDS Lab — 공용 스타일
   ------------------------------------------------------------
   모든 페이지가 공유하는 디자인 토큰 / 리셋 / 네비게이션 /
   페이지 히어로 / 섹션 / 버튼 / 푸터.

   페이지 고유 규칙은 각 HTML의 <style> 블록에 남아 있고,
   그 블록이 이 파일보다 뒤에 로드되므로 필요하면 여기 값을
   그대로 덮어쓸 수 있다. (예: index.html의 .section-title)
   ============================================================ */

/* ── 디자인 토큰 ── */
:root{
  --bg:#ffffff; --bg2:#f8fafc; --bg3:#f1f5f9;
  --surface:#ffffff; --surface2:#f1f5f9;
  --border:#e2e8f0; --border2:#cbd5e1;
  --accent:#2563eb; --accent2:#1d4ed8;
  --accent-soft:rgba(37,99,235,0.08); --accent-glow:rgba(37,99,235,0.2);
  --gold:#b45309; --gold-soft:rgba(180,83,9,0.08);
  --text:#0f172a; --text2:#475569; --text3:#94a3b8;
  --green:#15803d; --green-soft:rgba(21,128,61,0.08);
  --red:#dc2626;
  --font-display:'Pretendard','DM Sans','Apple SD Gothic Neo','Malgun Gothic',sans-serif;
  --font-body:'Pretendard','DM Sans','Apple SD Gothic Neo','Malgun Gothic',sans-serif;
  --font-mono:'JetBrains Mono',monospace;
  --radius:8px; --radius-lg:16px;
  --transition:0.25s cubic-bezier(0.4,0,0.2,1);
}

/* ── 리셋 / 타이포 ── */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;}
body{background:var(--bg);color:var(--text);font-family:var(--font-body);font-size:16px;line-height:1.7;overflow-x:hidden;word-break:keep-all;overflow-wrap:break-word;}
a{color:inherit;text-decoration:none;}
img{max-width:100%;display:block;}
h1,h2,h3,
.hero-title,.page-title,.section-title,.section-heading,
.area-title,.pi-name,.step-num,.cta-title,.stat-num{font-family:var(--font-display);font-weight:700;letter-spacing:0;}
.container{max-width:1100px;margin:0 auto;padding:0 2rem;}

::-webkit-scrollbar{width:6px;}
::-webkit-scrollbar-track{background:var(--bg2);}
::-webkit-scrollbar-thumb{background:var(--border2);border-radius:3px;}

/* ── 네비게이션 ── */
nav{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(255,255,255,0.92);backdrop-filter:blur(16px) saturate(180%);border-bottom:1px solid var(--border);box-shadow:0 1px 3px rgba(0,0,0,0.06);height:60px;display:flex;align-items:center;}
.nav-inner{max-width:1100px;margin:0 auto;padding:0 2rem;width:100%;display:flex;align-items:center;justify-content:space-between;}
.nav-logo{display:flex;align-items:center;}
.nav-logo-img{height:46px;width:auto;mix-blend-mode:multiply;filter:contrast(1.1);transition:opacity var(--transition);}
.nav-logo:hover .nav-logo-img{opacity:0.75;}
.nav-links{display:flex;align-items:center;gap:1.55rem;list-style:none;}
.nav-links a{font-size:0.85rem;color:var(--text2);transition:color var(--transition);}
.nav-links a:hover{color:var(--text);}
.nav-links a.active{color:var(--accent);}
.lang-toggle{font-family:var(--font-mono);font-size:0.75rem;background:var(--surface);border:1px solid var(--border2);color:var(--text2);padding:0.3em 0.8em;border-radius:20px;cursor:pointer;transition:all var(--transition);margin-left:1rem;}
.lang-toggle:hover{background:var(--surface2);color:var(--text);}

/* ── 페이지 히어로 (index 외 하위 페이지) ── */
.page-hero{padding:7rem 0 4rem;background:var(--bg2);border-bottom:1px solid var(--border);position:relative;overflow:hidden;}
.page-hero-bg{position:absolute;inset:0;background:radial-gradient(ellipse 60% 80% at 80% 50%,rgba(37,99,235,0.06) 0%,transparent 70%);pointer-events:none;}
.page-hero-grid{position:absolute;inset:0;background-image:linear-gradient(var(--border) 1px,transparent 1px),linear-gradient(90deg,var(--border) 1px,transparent 1px);background-size:60px 60px;opacity:0.5;mask-image:radial-gradient(ellipse 90% 90% at 50% 50%,black 20%,transparent 80%);}
.page-hero-content{position:relative;z-index:1;}
.page-eyebrow{font-family:var(--font-mono);font-size:0.7rem;color:var(--accent);letter-spacing:0.15em;text-transform:uppercase;margin-bottom:1rem;display:flex;align-items:center;gap:0.6rem;}
.page-eyebrow::before{content:'';display:block;width:24px;height:1px;background:var(--accent);}
.page-title{font-size:clamp(2rem,4vw,3rem);color:var(--text);margin-bottom:0.75rem;}
.page-desc{font-size:1rem;color:var(--text2);max-width:620px;line-height:1.8;}

/* ── 섹션 ── */
.section{padding:5rem 0;}
.section-eyebrow{font-family:var(--font-mono);font-size:0.7rem;color:var(--accent);letter-spacing:0.15em;text-transform:uppercase;margin-bottom:0.75rem;display:flex;align-items:center;gap:0.6rem;}
.section-eyebrow::before{content:'';display:block;width:20px;height:1px;background:var(--accent);}
.section-title{font-size:clamp(1.5rem,2.5vw,2rem);color:var(--text);margin-bottom:0.5rem;}
.section-sub{font-size:0.9rem;color:var(--text2);margin-bottom:2.5rem;line-height:1.7;}

/* ── 버튼 ── */
.btn-primary{background:var(--accent);color:#fff;font-size:0.875rem;font-weight:500;padding:0.7rem 1.5rem;border-radius:var(--radius);transition:all var(--transition);border:none;cursor:pointer;display:inline-block;}
.btn-primary:hover{background:var(--accent2);transform:translateY(-1px);box-shadow:0 8px 24px var(--accent-glow);}
.btn-outline{background:transparent;color:var(--text2);font-size:0.875rem;font-weight:500;padding:0.7rem 1.5rem;border-radius:var(--radius);border:1px solid var(--border2);transition:all var(--transition);cursor:pointer;display:inline-block;}
.btn-outline:hover{border-color:var(--accent);color:var(--accent);background:var(--accent-soft);}

/* ── 태그 ── */
.tag{display:inline-flex;align-items:center;font-family:var(--font-mono);font-size:0.7rem;font-weight:500;padding:0.2em 0.65em;border-radius:4px;letter-spacing:0.04em;}
.tag-blue{background:var(--accent-soft);color:var(--accent2);border:1px solid rgba(59,130,246,0.25);}
.tag-gold{background:var(--gold-soft);color:var(--gold);border:1px solid rgba(240,180,41,0.25);}
.tag-green{background:var(--green-soft);color:var(--green);border:1px solid rgba(34,197,94,0.25);}

/* ── 푸터 ── */
footer{background:var(--bg2);border-top:1px solid var(--border);padding:3rem 0 2rem;}
.footer-inner{max-width:1100px;margin:0 auto;padding:0 2rem;display:grid;grid-template-columns:1fr 1fr 1fr;gap:2rem;}
.footer-brand{font-family:var(--font-mono);font-size:0.85rem;color:var(--accent);margin-bottom:0.75rem;}
.footer-tagline{font-size:0.8rem;color:var(--text2);line-height:1.6;}
.footer-heading{font-size:0.75rem;font-weight:600;color:var(--text);text-transform:uppercase;letter-spacing:0.08em;margin-bottom:0.75rem;}
.footer-info{font-size:0.8rem;color:var(--text2);line-height:1.8;}
.footer-info a{color:var(--accent);transition:opacity var(--transition);}
.footer-info a:hover{opacity:0.7;}
.footer-bottom{max-width:1100px;margin:2rem auto 0;padding:1.5rem 2rem 0;border-top:1px solid var(--border);font-size:0.75rem;color:var(--text3);display:flex;justify-content:space-between;align-items:center;}

/* ── 애니메이션 ── */
@keyframes fadeUp{from{opacity:0;transform:translateY(16px);}to{opacity:1;transform:translateY(0);}}
.page-eyebrow{animation:fadeUp 0.5s ease both 0.1s;}
.page-title{animation:fadeUp 0.5s ease both 0.2s;}
.page-desc{animation:fadeUp 0.5s ease both 0.3s;}

/* ── 반응형 (모든 페이지 공통) ── */
@media(max-width:640px){
  .nav-links{display:none;}
  .footer-inner{grid-template-columns:1fr;}
  .footer-bottom{flex-direction:column;gap:0.5rem;text-align:center;}
}