/* DANAL Lab — al-folio inspired stylesheet */
/* -------------------------------------------------- */
:root {
  --ink:        #1a1a1a;
  --ink-soft:   #4a4a4a;
  --muted:      #7a7a7a;
  --line:       #e5e5e5;
  --bg:         #ffffff;
  --bg-soft:    #fafafa;
  --accent:     #2D6A4F;   /* nursing teal */
  --accent-2:   #40916C;
  --accent-3:   #D4A373;   /* warm sand */
  --coral:      #C1666B;   /* highlight */
  --data-blue:  #1976D2;
  --radius:     10px;
  --shadow:     0 1px 2px rgba(0,0,0,.04), 0 8px 24px rgba(0,0,0,.06);
  --maxw:       1100px;
  --font-body:  "Inter", "Noto Sans KR", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-serif: "Source Serif 4", "Noto Serif KR", Georgia, serif;
  --font-mono:  "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; transition: color .15s; }
a:hover { color: var(--coral); text-decoration: underline; }

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  color: var(--ink);
  line-height: 1.25;
  font-weight: 600;
  margin: 1.6em 0 .6em;
}
h1 { font-size: 2.2rem; }
h2 { font-size: 1.55rem; border-bottom: 1px solid var(--line); padding-bottom: .35em; }
h3 { font-size: 1.2rem; color: var(--accent); }

.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ---------- Header ---------- */
header.site-header {
  position: sticky;
  top: 0;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
  z-index: 100;
}
.nav-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: .9rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.brand {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -.01em;
  display: flex;
  align-items: center;
  gap: .5rem;
}
.brand .dot {
  width: 9px; height: 9px; border-radius: 50%;
  background: var(--accent); display: inline-block;
}
.brand small {
  font-family: var(--font-body);
  font-size: .72rem;
  color: var(--muted);
  font-weight: 400;
  margin-left: .4rem;
  letter-spacing: .02em;
}
nav.main-nav ul {
  display: flex;
  gap: 1.4rem;
  list-style: none;
  margin: 0; padding: 0;
  align-items: center;
}
nav.main-nav a {
  color: var(--ink-soft);
  font-size: .95rem;
  font-weight: 500;
}
nav.main-nav a.active { color: var(--accent); }
nav.main-nav a:hover { color: var(--accent); text-decoration: none; }
.lang-toggle {
  border: 1px solid var(--line);
  background: var(--bg);
  padding: .3rem .7rem;
  border-radius: 999px;
  font-size: .8rem;
  cursor: pointer;
  color: var(--ink-soft);
  font-family: var(--font-body);
}
.lang-toggle:hover { border-color: var(--accent); color: var(--accent); }

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--ink);
}

/* ---------- Hero ---------- */
.hero {
  padding: 4rem 0 3rem;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, var(--bg) 0%, var(--bg-soft) 100%);
}
.hero-grid {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 3rem;
  align-items: center;
}
.hero-text h1 {
  font-size: 2.6rem;
  margin: 0 0 .5rem;
  letter-spacing: -.015em;
}
.hero-text .tagline {
  font-size: 1.15rem;
  color: var(--ink-soft);
  margin: 0 0 1.2rem;
  line-height: 1.6;
  font-family: var(--font-serif);
  font-style: italic;
}
.hero-text .lead {
  color: var(--ink-soft);
  font-size: 1rem;
  max-width: 620px;
  margin: 0 0 1.5rem;
}
.hero-actions {
  display: flex;
  gap: .7rem;
  flex-wrap: wrap;
}
.btn {
  display: inline-block;
  padding: .6rem 1.1rem;
  border-radius: 999px;
  font-size: .9rem;
  font-weight: 500;
  border: 1px solid var(--accent);
  color: var(--accent);
  background: var(--bg);
  transition: all .15s;
}
.btn:hover {
  background: var(--accent);
  color: #fff;
  text-decoration: none;
}
.btn-filled {
  background: var(--accent);
  color: #fff;
}
.btn-filled:hover {
  background: var(--accent-2);
  border-color: var(--accent-2);
  color: #fff;
}
.hero-photo {
  width: 280px;
  height: 280px;
  border-radius: 50%;
  overflow: hidden;
  background: var(--bg-soft);
  border: 3px solid var(--line);
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  justify-content: center;
}
.hero-photo img { width: 100%; height: 100%; object-fit: cover; }

/* ---------- Sections ---------- */
main { padding: 3rem 0 4rem; }
section.block { margin-bottom: 3rem; }
section.block h2 { margin-top: 0; }

.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.4rem; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.4rem; }

.card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.4rem;
  background: var(--bg);
  transition: all .2s;
}
.card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}
.card h3 {
  margin: 0 0 .5rem;
  font-size: 1.1rem;
  color: var(--ink);
}
.card p { margin: 0; font-size: .92rem; color: var(--ink-soft); }
.card .tag {
  display: inline-block;
  font-size: .7rem;
  padding: .15rem .55rem;
  border-radius: 999px;
  background: var(--bg-soft);
  color: var(--accent);
  border: 1px solid var(--line);
  margin-right: .3rem;
  margin-bottom: .4rem;
  font-family: var(--font-mono);
}

/* ---------- News/List ---------- */
.news-list { list-style: none; padding: 0; margin: 0; }
.news-list li {
  padding: 1rem 0;
  border-bottom: 1px solid var(--line);
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 1rem;
}
.news-list li:last-child { border-bottom: none; }
.news-list .date {
  font-family: var(--font-mono);
  font-size: .82rem;
  color: var(--muted);
  padding-top: .1rem;
}
.news-list .content { font-size: .95rem; color: var(--ink-soft); }

/* ---------- Publications ---------- */
.pub-list { list-style: none; padding: 0; margin: 0; }
.pub-list li {
  padding: 1.2rem 0;
  border-bottom: 1px solid var(--line);
}
.pub-list li:last-child { border-bottom: none; }
.pub-title { font-weight: 600; color: var(--ink); display: block; margin-bottom: .2rem; }
.pub-authors { font-size: .88rem; color: var(--ink-soft); display: block; margin-bottom: .15rem; }
.pub-venue { font-size: .85rem; color: var(--muted); font-style: italic; display: block; margin-bottom: .4rem; }
.pub-links a {
  font-size: .78rem;
  padding: .15rem .55rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  margin-right: .3rem;
  color: var(--accent);
}
.pub-link.disabled {
  display: inline-block;
  font-size: .78rem;
  padding: .15rem .55rem;
  border: 1px dashed var(--line);
  border-radius: 999px;
  margin-right: .3rem;
  color: var(--muted);
  cursor: not-allowed;
  opacity: .6;
}
.btn-disabled {
  cursor: not-allowed;
  opacity: .55;
  pointer-events: none;
}
.pub-year-header {
  font-family: var(--font-mono);
  font-size: .85rem;
  color: var(--muted);
  margin: 2rem 0 .5rem;
  letter-spacing: .08em;
}

/* ---------- Project page ---------- */
.project-hero {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  color: #fff;
  padding: 3rem 0;
  border-radius: var(--radius);
  margin-bottom: 2rem;
}
.project-hero .container { color: #fff; }
.project-hero h1 { color: #fff; margin-top: 0; }
.project-hero .meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin-top: 1.5rem;
  font-size: .9rem;
  opacity: .92;
}
.project-hero .meta span strong { display: block; font-size: .72rem; opacity: .75; text-transform: uppercase; letter-spacing: .05em; }

/* ---------- Footer ---------- */
footer.site-footer {
  border-top: 1px solid var(--line);
  padding: 2.5rem 0 3rem;
  margin-top: 4rem;
  background: var(--bg-soft);
  font-size: .85rem;
  color: var(--muted);
}
footer .foot-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}
footer h4 {
  font-family: var(--font-body);
  font-size: .85rem;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--ink);
  margin: 0 0 .7rem;
}
footer ul { list-style: none; padding: 0; margin: 0; }
footer ul li { margin-bottom: .35rem; }
footer a { color: var(--ink-soft); }
footer .ack {
  border-top: 1px solid var(--line);
  padding-top: 1.2rem;
  font-size: .78rem;
  color: var(--muted);
  line-height: 1.6;
}
footer .ack strong { color: var(--ink-soft); }

/* ---------- Language ---------- */
[data-lang-en], html[lang="en"] [data-lang-ko] { display: none; }
html[lang="en"] [data-lang-en] { display: initial; }
html[lang="en"] h1[data-lang-en],
html[lang="en"] h2[data-lang-en],
html[lang="en"] h3[data-lang-en],
html[lang="en"] p[data-lang-en],
html[lang="en"] li[data-lang-en],
html[lang="en"] div[data-lang-en] { display: block; }
html[lang="en"] span[data-lang-en],
html[lang="en"] a[data-lang-en],
html[lang="en"] strong[data-lang-en],
html[lang="en"] em[data-lang-en] { display: inline; }

/* ---------- Responsive ---------- */
@media (max-width: 820px) {
  .hero-grid { grid-template-columns: 1fr; text-align: center; }
  .hero-photo { margin: 0 auto; width: 200px; height: 200px; }
  .grid-3 { grid-template-columns: 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
  footer .foot-grid { grid-template-columns: 1fr; }
  nav.main-nav ul {
    display: none;
    position: absolute;
    top: 100%;
    left: 0; right: 0;
    background: #fff;
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    padding: 1rem 1.5rem;
    gap: .8rem;
  }
  nav.main-nav.open ul { display: flex; }
  .mobile-menu-btn { display: block; }
  .news-list li { grid-template-columns: 1fr; gap: .2rem; }
  h1 { font-size: 1.8rem; }
  .hero-text h1 { font-size: 2rem; }
}