:root{
  --bg:#ffffff; --fg:#0f172a; --muted:#475569;
  --accent:#990000;       /* Red */
  --accent-2:#003478;     /* Blue */
  --gray:#6b7280;         /* Gray */
}

*{ box-sizing:border-box }
body{
  margin:0; font-family:'Open Sans', Verdana, Geneva, sans-serif;
  color:var(--fg); background:var(--bg); letter-spacing:.01em; line-height:1.7;
}
a{ color:var(--accent); text-decoration:none }
a:hover{ text-decoration:underline }

.container{ width:min(1100px,95%); margin:0 auto; padding:0 20px }

/* Header / Nav (공통) */
header{ position:sticky; top:0; backdrop-filter:blur(6px); background:rgba(255,255,255,.95); border-bottom:3px solid var(--accent); z-index:50 }
nav{ display:flex; align-items:center; justify-content:space-between; padding:14px 0 }
.brand{ font-weight:800; letter-spacing:.2px; 
        white-space: nowrap; /* 줄바꿈 방지 */ 
        font-size: clamp(14px, 2.5vw, 18px); /* 화면 크기에 맞게 자동 조정 */ }
.brand .E{ color:var(--accent-2) }  /* Blue */
.brand .I{ color:var(--accent) }    /* Red  */
.brand .L{ color:var(--gray) }      /* Gray */
.brand small{ font-weight:600; color:var(--muted) }

.nav{ list-style:none; display:flex; align-items:center; gap:22px; margin:0; padding:0 }
.nav>li{ position:relative }
.nav>li>a{ font-weight:600; display:inline-block; padding:6px 4px; color:var(--fg) }
.nav>li>a:hover{ color:var(--accent) }

/* Mobile nav */
.menu-toggle{ display:none; background:none; border:0; font-size:22px; font-weight:700; padding:6px 8px; cursor:pointer; color:var(--fg) }
@media (max-width:900px){
  .menu-toggle{ display:block }
  .nav{
    display:none; position:absolute; right:0; top:100%; background:#fff; border:1px solid #e5e7eb; border-radius:10px;
    padding:10px 14px; margin:8px 0 0; box-shadow:0 8px 20px rgba(0,0,0,.08);
    width:min(92vw,360px); flex-direction:column; gap:10px; z-index:1000; text-align:left
  }
  .nav.show{ display:flex }
  .nav>li>a{ display:block; padding:10px 8px; text-align:left }
}

/* Sections / Typography */
h1{ font-size:clamp(22px,5vw,32px); margin:14px 0 16px; font-weight:700 }
.section-title{
  font-size:24px; font-weight:700; color:#243b53;
  margin-top:32px; margin-bottom:12px; border-bottom:3px solid var(--accent);
  display:inline-block; padding-bottom:4px
}
.year{
  border-bottom:2px solid var(--accent);
  display:inline-block; padding-bottom:4px; margin:26px 0 12px;
  font-size:22px; font-weight:800
}
section{ margin:32px 0 }
main img{ width:100%; height:auto; border-radius:10px; margin:16px 0 }
.lead{ font-size:18px; color:var(--muted) }
.news-list{ padding-left:20px; margin:10px 0 }

/* Footer */
footer{ border-top:3px solid var(--accent); padding:32px 0 40px; color:var(--muted); text-align:center; margin-top:40px }

/* index 비전용 모노스페이스 클래스 */
.vision-mono{
  font-family:Consolas,'Courier New',ui-monospace,SFMono-Regular,Menlo,monospace;
}

/* ================================
   Social icon buttons (홈/LinkedIn/Email/CV)
   ================================ */
.social{ display:flex; gap:12px; margin-top:12px }
.icon-btn{
  --brand:#003478;               /* SeoulTech Blue */
  --ring:#e5e7eb;
  --fg:#334155;
  width:40px; height:40px; border-radius:50%;
  display:inline-flex; align-items:center; justify-content:center;
  background:#f3f4f6; border:1px solid var(--ring);
  transition: transform .12s ease, background .15s ease, border-color .15s ease;
  text-decoration:none;          /* 밑줄 제거 */
}
.icon-btn svg{ width:20px; height:20px; fill:var(--fg); transition:fill .15s ease }
.icon-btn:hover{ background:var(--brand); border-color:var(--brand); transform:translateY(-1px) }
.icon-btn:hover svg{ fill:#ffffff }

/* 접근성 포커스 */
.icon-btn:focus-visible{
  outline:3px solid rgba(0,52,120,.35);
  outline-offset:2px;
  border-color:var(--brand);
}

/* 아이콘 앵커는 어떤 상태에서도 밑줄 없음 */
.icon-btn,
.icon-btn:hover,
.icon-btn:focus,
.icon-btn:active {
  text-decoration:none !important;
}

/* CV 텍스트 아이콘 (LinkedIn과 시각적 크기/톤 통일) */
.icon-btn.cv{
  font-family:'Open Sans', Verdana, Geneva, sans-serif;
  font-weight:800;
  font-size:16.5px;        /* LinkedIn 크기 보정 */
  text-transform:lowercase;
  letter-spacing:0.2px;
  color:#334155;
  line-height:1;
  transform:translateY(0.5px);
}
.icon-btn.cv:hover{
  background:var(--accent-2);
  border-color:var(--accent-2);
  color:#ffffff;
}

/* Enforce identical header spacing on every page */
header .container { padding-left: 20px !important; padding-right: 20px !important; }
.brand, .brand a { font-weight: 800; }

/* ===== Compact, consistent section spacing across pages ===== */
main section { margin: 22px 0; }                 /* 섹션 기본 간격 32px → 22px */
main section + section { margin-top: 18px; }     /* 연속 섹션 사이 간격 조금 더 타이트 */
main .section-title { margin-top: 0; }           /* 섹션 시작부 중복 위여백 제거 */
main .section-title + .section-text { margin-top: 6px; }  /* 제목-본문 사이만 살짝 띄움 */

/* (선택) 상단 모노스페이스 문구의 공백도 전역으로 정리하고 싶다면 */
.center-quote { margin: 24px auto 20px; }        /* Opportunities 등 모든 페이지 공통 적용 */

/* Prevent iOS Safari from auto-zooming monospace or small text */
html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

/* Publications intro or any monospace section tuning */
.pub-intro {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

/* Mobile: keep monospace readable but compact */
@media (max-width: 480px) {
  .pub-intro {
    font-size: clamp(13px, 3.6vw, 15px);
    line-height: 1.55;
    margin: 10px 0 8px;
  }
}