/* ===== RESET & BASE ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', 'Noto Sans KR', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: #333;
  background: #fff;
  line-height: 1.8;
  font-weight: 400;
}

/* ===== HEADER ===== */
header {
  background: #fff;
  color: #333;
  padding: 0;
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid #eee;
}
.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 2rem;
}
.site-title {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  padding: 1rem 0;
}
.site-title a { color: #222; text-decoration: none; }
nav { display: flex; align-items: center; gap: 0; }
nav a {
  color: #555;
  text-decoration: none;
  padding: 1rem 1rem;
  font-size: 0.85rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  transition: color 0.2s;
}
nav a:hover, nav a.active { color: #7c2d12; }
.lang-switch {
  display: inline-block;
  margin-left: 0.5rem;
  padding: 0.3rem 0.8rem;
  border: 1.5px solid #7c2d12;
  border-radius: 4px;
  color: #7c2d12;
  text-decoration: none;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  transition: all 0.2s;
}
.lang-switch:hover { background: #7c2d12; color: #fff; }

/* ===== HERO ===== */
.hero {
  background: #faf6f1 url('hero-bg.svg') center center / cover no-repeat;
  color: #333;
  text-align: center;
  padding: 5rem 2rem 4rem;
  border-bottom: 3px solid #7c2d12;
  position: relative;
}
.hero h1 {
  font-size: 2.2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  letter-spacing: 0.02em;
  color: #222;
}
.hero .subtitle {
  font-size: 1.05rem;
  color: #777;
  font-weight: 300;
  margin-bottom: 1.2rem;
}
.hero .description {
  max-width: 680px;
  margin: 0 auto;
  font-size: 0.95rem;
  line-height: 1.9;
  color: #666;
  font-weight: 300;
}

/* ===== SECTIONS ===== */
section { padding: 4rem 2rem; }
.container { max-width: 1000px; margin: 0 auto; }
section:nth-child(even) { background: #faf6f1; }
.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: #222;
  margin-bottom: 0.3rem;
  padding-bottom: 0.8rem;
  border-bottom: none;
  position: relative;
}
.section-title::after {
  content: '';
  display: block;
  width: 50px;
  height: 3px;
  background: #7c2d12;
  margin-top: 0.6rem;
  border-radius: 2px;
}
.section-subtitle {
  font-size: 0.88rem;
  color: #999;
  margin-bottom: 2rem;
  font-weight: 400;
  margin-top: 0.5rem;
}

/* ===== ABOUT ===== */
.about-text {
  font-size: 0.95rem;
  line-height: 2;
  color: #444;
}
.about-info {
  margin-top: 2.5rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
.info-card {
  background: #faf6f1;
  padding: 1.3rem 1.5rem;
  border-left: 3px solid #7c2d12;
  border-radius: 4px;
}
.info-card .label {
  font-size: 0.72rem;
  color: #999;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.3rem;
  font-weight: 500;
}
.info-card .value { font-size: 0.92rem; font-weight: 600; color: #333; }
.info-card .value a { color: #7c2d12; text-decoration: none; }
.info-card .value a:hover { text-decoration: underline; }

/* ===== MEMBERS ===== */
.members-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}
.member-card {
  background: #fff;
  padding: 1.5rem;
  border-radius: 8px;
  border: 1px solid #eee;
  transition: box-shadow 0.2s, transform 0.2s;
}
.member-card:hover {
  box-shadow: 0 4px 16px rgba(0,0,0,0.06);
  transform: translateY(-2px);
}
.member-name {
  font-size: 1rem;
  font-weight: 700;
  color: #222;
  margin-bottom: 0.25rem;
}
.member-name-en {
  font-size: 0.82rem;
  color: #999;
  margin-bottom: 0.5rem;
  font-weight: 400;
}
.member-affiliation {
  font-size: 0.84rem;
  color: #666;
  line-height: 1.5;
}
.member-role {
  display: inline-block;
  margin-top: 0.5rem;
  font-size: 0.72rem;
  background: #7c2d12;
  color: #fff;
  padding: 0.2rem 0.65rem;
  border-radius: 12px;
  font-weight: 500;
  letter-spacing: 0.02em;
}
.member-note {
  font-size: 0.78rem;
  color: #aaa;
  margin-top: 0.4rem;
}

/* ===== SEMINAR TIMELINE ===== */
.timeline { position: relative; padding-left: 2.5rem; }
.timeline::before {
  content: '';
  position: absolute;
  left: 0.6rem;
  top: 0;
  bottom: 0;
  width: 2px;
  background: #e0d8cc;
}
.timeline-item {
  position: relative;
  margin-bottom: 2.5rem;
  padding-bottom: 1rem;
}
.timeline-item::before {
  content: '';
  position: absolute;
  left: -2.15rem;
  top: 0.45rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #7c2d12;
  border: 2px solid #fff;
  box-shadow: 0 0 0 2px #e0d8cc;
}
.timeline-item.upcoming::before { background: #f9a825; box-shadow: 0 0 0 2px #fde8a0; }
.timeline-date {
  font-size: 0.82rem;
  color: #999;
  font-weight: 500;
  margin-bottom: 0.3rem;
  letter-spacing: 0.02em;
}
.timeline-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: #222;
  margin-bottom: 0.4rem;
}
.timeline-badge {
  display: inline-block;
  font-size: 0.7rem;
  padding: 0.15rem 0.55rem;
  border-radius: 12px;
  margin-right: 0.4rem;
  margin-bottom: 0.3rem;
  font-weight: 500;
}
.badge-inaugural { background: #e3f2fd; color: #1565c0; }
.badge-lecture { background: #e8f5e9; color: #2e7d32; }
.badge-workshop { background: #fff3e0; color: #e65100; }
.badge-discussion { background: #f3e5f5; color: #7b1fa2; }
.badge-upcoming { background: #fffde7; color: #f57f17; border: 1px dashed #f9a825; }
.timeline-reading {
  background: #faf6f1;
  border: 1px solid #eee;
  border-radius: 6px;
  padding: 1rem 1.2rem;
  margin-top: 0.5rem;
  font-size: 0.88rem;
}
.timeline-reading .reading-label {
  font-size: 0.72rem;
  color: #999;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.4rem;
  font-weight: 500;
}
.timeline-reading ul {
  list-style: none;
  padding: 0;
}
.timeline-reading li {
  padding: 0.25rem 0;
  padding-left: 1rem;
  position: relative;
  color: #555;
}
.timeline-reading li::before {
  content: '\2014';
  position: absolute;
  left: 0;
  color: #ccc;
}
.timeline-reading a {
  color: #7c2d12;
  text-decoration: none;
  transition: color 0.2s;
}
.timeline-reading a:hover { color: #5c1e0c; text-decoration: underline; }
.timeline-presenter {
  font-size: 0.82rem;
  color: #888;
  margin-top: 0.5rem;
}
.timeline-summary {
  font-size: 0.85rem;
  color: #777;
  margin-top: 0.4rem;
  line-height: 1.7;
}
.file-icon {
  display: inline-block;
  font-size: 0.65rem;
  background: #fef3e7;
  color: #7c2d12;
  padding: 0.1rem 0.4rem;
  border-radius: 3px;
  margin-left: 0.3rem;
  vertical-align: middle;
  font-weight: 500;
}

/* ===== READING LIST ===== */
.reading-category {
  margin-bottom: 2rem;
}
.reading-category h3 {
  font-size: 0.95rem;
  color: #222;
  font-weight: 700;
  margin-bottom: 0.8rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid #eee;
}
.reading-list {
  list-style: none;
  padding: 0;
}
.reading-list li {
  padding: 0.6rem 0;
  border-bottom: 1px solid #f5f5f5;
  font-size: 0.9rem;
  color: #555;
}
.reading-list .author { font-weight: 600; color: #333; }
.reading-list .title { font-style: italic; }
.reading-list .year { color: #999; font-size: 0.82rem; }
.reading-list a {
  color: #7c2d12;
  text-decoration: none;
  transition: color 0.2s;
}
.reading-list a:hover { color: #5c1e0c; text-decoration: underline; }

/* ===== CONTACT ===== */
#contact a { color: #7c2d12; text-decoration: none; }
#contact a:hover { text-decoration: underline; }

/* ===== FOOTER ===== */
footer {
  background: #faf6f1;
  color: #999;
  text-align: center;
  padding: 2.5rem 2rem;
  font-size: 0.82rem;
  line-height: 1.8;
  border-top: 1px solid #eee;
}
footer a { color: #7c2d12; text-decoration: none; }
footer a:hover { color: #5c1e0c; }

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .header-inner { flex-direction: column; padding: 0.8rem 1rem; gap: 0.5rem; }
  nav { flex-wrap: wrap; justify-content: center; }
  nav a { padding: 0.5rem 0.7rem; font-size: 0.78rem; }
  .hero { padding: 3rem 1.5rem 2.5rem; }
  .hero h1 { font-size: 1.5rem; }
  .about-info { grid-template-columns: 1fr; }
  .members-grid { grid-template-columns: 1fr; }
  section { padding: 2.5rem 1.2rem; }
  .timeline { padding-left: 2rem; }
}