/* ====== Base ====== */
:root{
  --bg:#0b0f19;
  --surface:#0f1524;
  --card:#131a2e;
  --ink:#e6e9ef;
  --muted:#98a2b3;
  --brand:#6ea8ff;
  --brand-ink:#0b3b7a;
  --line:#22304d;
  --radius:16px;
  --shadow:0 10px 30px rgba(2,8,23,.35);
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: Inter, "Noto Sans KR", system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial, "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  color:var(--ink);
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(110,168,255,.15), transparent 60%),
    radial-gradient(1000px 600px at -10% 110%, rgba(110,168,255,.08), transparent 60%),
    var(--bg);
  letter-spacing:.01em;
}

img{max-width:100%;display:block}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:1100px;margin:0 auto;padding:0 20px}

.skip-link{position:absolute;left:-9999px;top:auto;width:1px;height:1px;overflow:hidden}
.skip-link:focus{position:fixed;left:16px;top:16px;width:auto;height:auto;padding:10px 14px;background:var(--brand);color:#001027;border-radius:10px;z-index:9999}

/* ====== Header / Nav ====== */
.site-header{position:sticky;top:0;z-index:50;border-bottom:1px solid rgba(255,255,255,.06);backdrop-filter:saturate(180%) blur(12px);background:rgba(11,15,25,.6);transform:translateY(0);transition:transform .35s ease}
.site-header.hidden{transform:translateY(-120%)} /* Contact 구간에서 숨김 */
.site-header .container{display:flex;align-items:center;justify-content:space-between;gap:14px;height:64px}

.brand{display:flex;align-items:center;gap:10px;color:var(--ink);text-decoration:none}
.brand:hover{text-decoration:none}
.brand-mark{display:inline-grid;place-items:center;width:36px;height:36px;border-radius:10px;background:linear-gradient(135deg,#80b3ff, #4a7ed6);color:#001027;font-weight:700;box-shadow:0 6px 16px rgba(110,168,255,.35)}
.brand-text{font-weight:600;font-size:15px;letter-spacing:.02em;opacity:.95}

.nav-toggle{display:none;background:none;border:0;color:var(--ink);font-size:20px}
.nav ul{display:flex;gap:16px;align-items:center}
.nav-link{display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border-radius:10px;color:var(--ink);opacity:.75}
.nav-link:hover,.nav-link.is-active{opacity:1;background:rgba(255,255,255,.06)}

.header-actions{display:flex;align-items:center;gap:10px}
.btn-cv{padding:8px 12px}
@media (max-width: 600px) {
  .btn-cv {
    padding: 8px 12px;   /* 좌우 여백 축소 */
    font-size: 0.8rem;  /* 글자 크기 축소 */
  }
}
.lang-toggle{border:1px solid rgba(255,255,255,.18);background:transparent;color:var(--ink);padding:8px 12px;border-radius:10px}
.lang-toggle:hover{background:rgba(255,255,255,.06)}

/* Mobile nav */
@media (max-width: 980px){
  .nav-toggle{display:inline-flex}
  .nav ul{position:absolute;right:20px;top:64px;flex-direction:column;background:rgba(11,15,25,.95);border:1px solid rgba(255,255,255,.06);padding:10px;border-radius:14px;box-shadow:var(--shadow);display:none}
  .nav[aria-expanded="true"] ul{display:flex}
  .only-mobile{display:inline-flex}
}
@media (min-width: 981px){ .only-mobile{display:none} }

/* ====== Sections ====== */
.section{padding:88px 0;border-top:1px solid rgba(255,255,255,.06)}
.section:first-of-type{border-top:0}
.section-title{font-size:28px;margin:0 0 22px;font-weight:700;letter-spacing:.01em}

/* ====== Hero ====== */
.hero{padding:120px 0 96px;background:
  radial-gradient(800px 400px at 20% -10%, rgba(110,168,255,.20), transparent 60%),
  radial-gradient(600px 300px at 120% 10%, rgba(110,168,255,.10), transparent 60%)
}
.hero-grid{display:grid;grid-template-columns:1.25fr 1fr;gap:40px;align-items:center}
.headline{font-size:42px;line-height:1.15;margin:0 0 8px}
.kicker{color:var(--muted);margin:0 0 8px}
.tags{color:#c9d7f0;margin:0 0 18px}
.hero-actions{display:flex;gap:12px}

.portrait{width:100%;max-width:380px;border-radius:20px;border:1px solid var(--line);box-shadow:var(--shadow);margin-left:auto}

@media (max-width: 960px){
  .hero-grid{grid-template-columns:1fr;gap:28px}
  .portrait{margin:0}
}

/* Buttons */
.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 16px;border-radius:12px;border:1px solid transparent;transition:transform .06s ease, border-color .2s ease, background .2s ease}
.btn:active{transform:translateY(1px)}
.btn-primary{background:linear-gradient(135deg,#7fb3ff,#4f82dd);color:#001027;font-weight:700;box-shadow:0 10px 20px rgba(110,168,255,.25)}
.btn-primary:hover{filter:saturate(110%)}
.btn-ghost{border-color:rgba(255,255,255,.18);color:var(--ink);background:transparent}
.btn-ghost:hover{background:rgba(255,255,255,.06)}

/* ====== Cards / grids ====== */
.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.card{background:linear-gradient(180deg, rgba(255,255,255,.02), rgba(255,255,255,.00));border:1px solid var(--line);border-radius:var(--radius);padding:18px 18px 16px;box-shadow:0 8px 24px rgba(2,8,23,.25)}
.card-title{font-weight:700;margin:2px 0 12px}
.list{margin:0;padding:0;list-style:none;display:grid;gap:10px}
.list .sub{color:var(--muted);font-size:.95rem;margin-top:2px}
.list.compact li{margin:0}
.block-title{font-weight:700;margin:6px 0 12px}
.mt{margin-top:22px}

@media (max-width: 1080px){ .card-grid{grid-template-columns:1fr 1fr} }
@media (max-width: 720px){ .card-grid{grid-template-columns:1fr} }

/* ====== Works ====== */
.split{display:grid;grid-template-columns:1.25fr .75fr;gap:28px}
@media (max-width: 960px){ .split{grid-template-columns:1fr} }

.ext-links{margin:6px 0 14px;color:var(--muted)}
.ext-links .sep{opacity:.6;margin:0 6px}

.pub-list{list-style:none;margin:0;padding:0;display:grid;gap:10px}
.pub-year{margin-top:12px;font-weight:700;color:#c8d9ff}
.chip{display:inline-flex;align-items:center;gap:6px;padding:2px 8px;border-radius:999px;border:1px solid rgba(255,255,255,.18);font-size:.9rem;margin-left:8px}

/* ====== Contact ====== */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.contact-card{background:linear-gradient(180deg, rgba(255,255,255,.02), rgba(255,255,255,.00));border:1px solid var(--line);border-radius:var(--radius);padding:18px;box-shadow:0 8px 24px rgba(2,8,23,.25)}
.contact-list{list-style:none;margin:0;padding:0;display:grid;gap:10px}
.contact-list i{width:18px;opacity:.8}
.note{color:var(--muted);margin-top:8px}

.map-wrap{border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);box-shadow:0 8px 24px rgba(2,8,23,.25)}
@media (max-width: 880px){ .contact-grid{grid-template-columns:1fr} }

/* ====== Footer ====== */
.site-footer{padding:26px 0 34px;border-top:1px solid rgba(255,255,255,.06)}
.site-footer .container{display:flex;gap:10px;justify-content:space-between;align-items:center;color:var(--muted);font-size:.95rem;flex-wrap:wrap}
.muted{opacity:.8}

/* ====== Utilities ====== */
.sr-only{position:absolute;left:-9999px;top:auto;width:1px;height:1px;overflow:hidden}
.nowrap{white-space:nowrap}

/* ====== Floating Top Button ====== */
.to-top{
  position:fixed;right:20px;bottom:20px;
  width:44px;height:44px;border-radius:12px;
  display:grid;place-items:center;
  border:1px solid rgba(255,255,255,.18);
  background:rgba(11,15,25,.75);
  color:var(--ink);box-shadow:0 10px 24px rgba(0,0,0,.25);
  opacity:0;pointer-events:none;transform:translateY(10px);
  transition:opacity .25s ease, transform .25s ease, background .25s ease;
  z-index:60;
}
.to-top.visible{opacity:1;pointer-events:auto;transform:translateY(0)}
.to-top:hover{background:rgba(255,255,255,.08)}
.muted-award{opacity:.85}

/* Tabs */
.tabs {
  display: flex;
  gap: 12px;
  margin-bottom: 24px;
  border-bottom: 1px solid rgba(255,255,255,.08);
  flex-wrap: wrap;
}
.tab-btn {
  padding: 12px 20px;
  border: 0;
  background: transparent;
  color: var(--muted);
  font-weight: 500;
  font-size: 1.1rem;
  cursor: pointer;
  border-radius: 8px 8px 0 0;
  transition: all .25s ease;
}
@media (max-width: 600px) {
  .tab-btn {
    padding: 8px 14px;   /* 좌우 여백 축소 */
    font-size: 0.95rem;  /* 글자 크기 축소 */
  }
}

.tab-btn:hover {
  color: var(--ink);
  background: rgba(255,255,255,.06);
}
.tab-btn.active {
  color: var(--ink);
  background: linear-gradient(135deg,#7fb3ff,#4f82dd);
  box-shadow: 0 -2px 10px rgba(110,168,255,.25);
}

/* Tab Content */
.tab-content {
  display: none;
  padding: 20px;
  background: linear-gradient(180deg, rgba(255,255,255,.03), rgba(255,255,255,.00));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 8px 24px rgba(2,8,23,.25);
}
.tab-content.active {
  display: block;
}