@import url('https://fonts.googleapis.com/css2?family=Nunito:ital,wght@0,300;0,400;0,500;0,600;0,700;0,800;1,400&display=swap');

html { scroll-behavior: smooth; }

/* ── CSS Variables ── */
:root {
  --bg: #ffffff;
  --bg-2: #faf7ff;
  --bg-3: #f3eeff;
  --card: #f7f3ff;
  --card-hover: #ede5ff;
  --text: #28283a;
  --text-sub: #68687f;
  --text-light: #9898b0;
  --accent: #a48dcc;
  --accent-hover: #8f78b8;
  --accent-soft: #e8dfff;
  --pink: #f7c5d8;
  --pink-soft: #fff0f5;
  --blue: #b8d8ea;
  --blue-soft: #eaf4fb;
  --mint: #b8e4d8;
  --border: #e2d8f8;
  --shadow: 0 4px 24px rgba(160, 130, 210, 0.10);
  --shadow-md: 0 8px 32px rgba(160, 130, 210, 0.15);
  --nav-bg: rgba(255, 255, 255, 0.92);
  --radius: 18px;
  --radius-sm: 10px;
  --transition: 0.25s ease;
  --tag-radius: 20px;
}

[data-theme="dark"] {
  --bg: #13132a;
  --bg-2: #191930;
  --bg-3: #1f1f3e;
  --card: #222244;
  --card-hover: #2a2a58;
  --text: #e8e8f8;
  --text-sub: #9898c0;
  --text-light: #6868a0;
  --accent: #b0a0dc;
  --accent-hover: #c8baf0;
  --accent-soft: #2e265a;
  --pink: #d4769a;
  --pink-soft: #2a1a28;
  --blue: #7ab0cc;
  --blue-soft: #1a2a38;
  --mint: #7abcb0;
  --border: #333368;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.30);
  --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.40);
  --nav-bg: rgba(19, 19, 42, 0.94);
}

/* ── Reset & Base ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: 'Nunito', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  transition: background var(--transition), color var(--transition);
  min-height: 100vh;
}

a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-hover); }

img { max-width: 100%; }

/* ── Navigation ── */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--nav-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
  padding: 0 2.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 62px;
  transition: background var(--transition), border-color var(--transition);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.55rem;
}

.nav-snu-logo {
  height: 18px;
  width: auto;
  opacity: 0.75;
  flex-shrink: 0;
  transition: opacity var(--transition);
}

.nav-snu-logo:hover { opacity: 1; }

[data-theme="dark"] .nav-snu-logo { filter: brightness(0) invert(1); opacity: 0.75; }

.nav-logo a {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.3px;
}

.nav-logo a:hover { color: var(--accent); }

.nav-links {
  display: flex;
  list-style: none;
  gap: 0.2rem;
  align-items: center;
}

.nav-links a {
  color: var(--text-sub);
  font-size: 0.92rem;
  font-weight: 600;
  padding: 0.45rem 0.9rem;
  border-radius: 8px;
  transition: color var(--transition), background var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--accent);
  background: var(--accent-soft);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

#theme-toggle {
  background: var(--card);
  border: none;
  border-radius: 50px;
  cursor: pointer;
  padding: 0.38rem 0.8rem;
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-sub);
  font-family: 'Nunito', sans-serif;
  transition: all var(--transition);
}

#theme-toggle:hover {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
}

#theme-toggle .icon { font-size: 0.95rem; }

/* ── Layout Containers ── */
.page-wrapper {
  max-width: 960px;
  margin: 0 auto;
  padding: 3.5rem 2rem 5rem;
}

.page-wrapper.wide {
  max-width: 1060px;
}

.page-wrapper.fullwidth {
  max-width: 100%;
  padding-left: 3rem;
  padding-right: 3rem;
}

/* ── Section Headers ── */
.section-title {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 0.3rem;
}

.section-line {
  width: 48px;
  height: 4px;
  background: linear-gradient(90deg, var(--accent), var(--pink));
  border-radius: 4px;
  margin-bottom: 2rem;
}

/* ── ABOUT PAGE ── */
.about-grid {
  display: grid;
  grid-template-columns: 265px 1fr;
  gap: 3.5rem;
  align-items: start;
  padding-top: 1rem;
}

.about-left {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.4rem;
  position: sticky;
  top: 82px;
}

.profile-photo-wrap {
  width: 242px;
  height: 242px;
  border-radius: 50%;
  overflow: hidden;
  border: 4px solid var(--accent-soft);
  box-shadow: 0 0 0 6px var(--bg-2), var(--shadow-md);
  background: var(--bg-3);
  display: flex;
  align-items: center;
  justify-content: center;
}

.profile-photo-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.photo-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  color: var(--text-light);
  font-size: 0.78rem;
  font-weight: 600;
  text-align: center;
  background: linear-gradient(135deg, var(--accent-soft) 0%, var(--pink-soft) 100%);
}

.photo-placeholder .ph-icon { font-size: 2.4rem; opacity: 0.5; }

.profile-photo-container {
  position: relative;
  width: fit-content;
}

.hi-bubble {
  position: absolute;
  top: 14px;
  left: -18px;
  background: #e8dfff;
  color: #111;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 0.28rem 0.65rem;
  border-radius: 14px;
  letter-spacing: 0.03em;
  pointer-events: none;
  z-index: 2;
}

.hi-bubble::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 12px;
  border-top: 9px solid #e8dfff;
  border-left: 7px solid transparent;
  border-right: 3px solid transparent;
}

.social-links {
  display: flex;
  gap: 0.6rem;
}

.social-btn {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: var(--card);
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-sub);
  font-size: 1rem;
  transition: all var(--transition);
  text-decoration: none;
}

.social-btn:hover {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.about-right { }

.about-name {
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--text);
  line-height: 1.1;
  margin-bottom: 0.4rem;
}

.about-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 0.3rem;
}

.about-affil {
  font-size: 0.9rem;
  color: var(--text-sub);
  font-weight: 600;
  margin-bottom: 1.8rem;
}

.about-bio {
  font-size: 0.96rem;
  color: var(--text-sub);
  line-height: 1.85;
  margin-bottom: 2rem;
}

.about-bio p { margin-bottom: 0.9rem; }
.about-bio p:last-child { margin-bottom: 0; }

.about-quote {
  margin: 1.2rem 0 0 0;
  padding: 0.65rem 1.1rem;
  background: var(--bg-2);
  border-radius: 8px;
  font-style: italic;
  font-size: 0.95rem;
  color: var(--text);
  font-weight: 600;
  line-height: 1.7;
}


.interests-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  justify-content: center;
}

.about-left .interests-grid {
  margin-top: 0;
}

.interests-label {
  font-size: 0.72rem;
  font-weight: 800;
  color: var(--text-light);
  letter-spacing: 1.2px;
  text-transform: uppercase;
  text-align: center;
  margin-top: 0.3rem;
  margin-bottom: 0.1rem;
}

.about-left .interest-chip {
  font-size: 0.72rem;
  padding: 0.2rem 0.6rem;
}

.interest-chip {
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: 20px;
  padding: 0.35rem 1rem;
  font-size: 0.83rem;
  font-weight: 700;
  border: 1.5px solid transparent;
  transition: all var(--transition);
}

.interest-chip:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
}

.interest-chip.pink  { background: #fff0f5; color: #c0507a; }
.interest-chip.blue  { background: #e8f3fb; color: #3a80a8; }
.interest-chip.mint  { background: #eafaf5; color: #3a9e7a; }
.interest-chip.coral { background: #fff0e8; color: #c86020; }
.interest-chip.rose  { background: #ffeaef; color: #c02858; }
.interest-chip.yellow{ background: #fffbea; color: #9a7800; }

[data-theme="dark"] .interest-chip.pink  { background: #2a1828; color: #e080b0; }
[data-theme="dark"] .interest-chip.blue  { background: #182030; color: #78b8d8; }
[data-theme="dark"] .interest-chip.mint  { background: #182a28; color: #68b8a0; }
[data-theme="dark"] .interest-chip.coral { background: #2a1808; color: #f08040; }
[data-theme="dark"] .interest-chip.rose  { background: #280818; color: #f07090; }
[data-theme="dark"] .interest-chip.yellow{ background: #282008; color: #e0b040; }

/* ── News / Updates ── */
.news-section { margin-top: 1rem; }

.news-title {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 0.8rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.news-list { list-style: none; }

.news-list li {
  display: flex;
  gap: 1rem;
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.88rem;
}

.news-list li:last-child { border-bottom: none; }

.news-date {
  color: var(--accent);
  font-weight: 700;
  white-space: nowrap;
  min-width: 90px;
  font-size: 0.82rem;
}

.news-text { color: var(--text-sub); }

/* ── PUBLICATIONS PAGE ── */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2.2rem;
}

.filter-btn {
  background: var(--card);
  border: 1.5px solid var(--border);
  border-radius: 20px;
  padding: 0.28rem 0.85rem;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-sub);
  cursor: pointer;
  font-family: 'Nunito', sans-serif;
  transition: all var(--transition);
}

.filter-btn:hover,
.filter-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(160, 130, 210, 0.30);
}

.pub-year-group { margin-bottom: 2.5rem; }

.pub-year-label {
  font-size: 0.82rem;
  font-weight: 800;
  color: var(--text-light);
  letter-spacing: 1.5px;
  text-transform: uppercase;
  margin-bottom: 1rem;
  padding-bottom: 0.4rem;
  border-bottom: 1.5px solid var(--border);
}

.pub-layout {
  display: flex;
  gap: 2rem;
  align-items: flex-start;
}

.pub-main { flex: 1; min-width: 0; }

.cv-layout {
  display: flex;
  gap: 2rem;
  align-items: flex-start;
}

.cv-main { flex: 1; min-width: 0; }

/* ── Section side nav (publications year + CV sections) ── */
.section-side-nav {
  position: sticky;
  top: 5.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.18rem;
  min-width: 72px;
  align-self: flex-start;
  border: none;
  outline: none;
}

#pub-year-nav {
  margin-top: 4rem;
}

.side-nav-label {
  font-size: 0.68rem;
  font-weight: 800;
  color: var(--text-light);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 0.3rem;
}

.side-nav-item {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-light);
  text-decoration: none;
  padding: 0.15rem 0;
  transition: color var(--transition);
  line-height: 1.5;
}

.side-nav-item:hover,
.side-nav-item.active {
  color: var(--accent);
}

.pub-card {
  background: var(--card);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1rem 1.3rem;
  margin-bottom: 0.75rem;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.pub-card:hover {
  background: var(--card-hover);
  border-color: var(--accent);
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.pub-card.hidden { display: none; }

.pub-title {
  font-size: 0.93rem;
  font-weight: 800;
  color: var(--text);
  line-height: 1.4;
}

.pub-title a {
  color: inherit;
  text-decoration: none;
}

.pub-title a:hover {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.pub-authors {
  font-size: 0.875rem;
  color: var(--text-sub);
  line-height: 1.5;
}

.pub-authors strong {
  color: var(--text);
  font-weight: 800;
}

.pub-venue-row {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  flex-wrap: wrap;
  margin-top: 0.15rem;
}

.pub-venue {
  font-size: 0.83rem;
  color: var(--accent);
  font-weight: 700;
  font-style: italic;
}

.pub-tag {
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: var(--tag-radius);
  padding: 0.22rem 0.75rem;
  font-size: 0.76rem;
  font-weight: 700;
}

/* 7-color pub-tag system:
   default=AI Companion(lavender), blue=HCI, mint=NLP/LLM,
   pink=Mental Health, coral=Sports, yellow=Simulation, indigo=Data Mining */
.pub-tag.pink   { background: #fff0f5; color: #c4567a; }
.pub-tag.blue   { background: #e8f3fb; color: #3a80a8; }
.pub-tag.mint   { background: #eafaf5; color: #3a9e7a; }
.pub-tag.coral  { background: #fff0e8; color: #c86020; }
.pub-tag.yellow { background: #fffbea; color: #9a7800; }
.pub-tag.indigo { background: #eeeeff; color: #5060b0; }

[data-theme="dark"] .pub-tag.pink   { background: #2a1828; color: #e080a8; }
[data-theme="dark"] .pub-tag.blue   { background: #182030; color: #78b8d4; }
[data-theme="dark"] .pub-tag.mint   { background: #182a28; color: #68b4a4; }
[data-theme="dark"] .pub-tag.coral  { background: #2a1808; color: #f08040; }
[data-theme="dark"] .pub-tag.yellow { background: #282008; color: #e0b040; }
[data-theme="dark"] .pub-tag.indigo { background: #181838; color: #9898e0; }

.pub-badge {
  background: linear-gradient(135deg, var(--pink) 0%, var(--accent) 100%);
  color: white;
  border-radius: 6px;
  padding: 0.18rem 0.6rem;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.3px;
}

.pub-badge.under-review {
  background: linear-gradient(135deg, #c8c8e0, #a0a0cc);
}

/* ── CV PAGE ── */
.cv-header-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.download-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  background: var(--accent);
  color: white;
  border-radius: 12px;
  padding: 0.7rem 1.5rem;
  font-size: 0.9rem;
  font-weight: 800;
  font-family: 'Nunito', sans-serif;
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}

.download-btn:hover {
  background: var(--accent-hover);
  color: white;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(160, 130, 210, 0.35);
}

.download-btn svg { width: 16px; height: 16px; }

.cv-section {
  margin-bottom: 2.8rem;
}

.cv-section-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text);
  padding-bottom: 0.6rem;
  border-bottom: 2.5px solid var(--border);
  margin-bottom: 1.4rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.cv-section-title .cv-icon { color: var(--accent); font-size: 1.1rem; }

.cv-entry {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.3rem 1.5rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--border);
}

.cv-entry:last-child { border-bottom: none; }

.cv-entry-main { }

.cv-entry-org {
  font-size: 0.95rem;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 0.1rem;
}

.cv-entry-role {
  font-size: 0.88rem;
  color: var(--text-sub);
  font-weight: 600;
  margin-bottom: 0.2rem;
}

.cv-entry-detail {
  font-size: 0.84rem;
  color: var(--text-light);
  font-style: italic;
  line-height: 1.5;
}

.cv-entry-date {
  font-size: 0.82rem;
  color: var(--text-light);
  font-weight: 600;
  white-space: nowrap;
  text-align: right;
  padding-top: 0.1rem;
}

.cv-entry-loc {
  font-size: 0.82rem;
  color: var(--text-light);
  text-align: right;
}

.cv-pub-item {
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--border);
  display: flex;
  gap: 1.2rem;
}

.cv-pub-item:last-child { border-bottom: none; }

.cv-pub-year {
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--accent);
  min-width: 44px;
  padding-top: 0.1rem;
}

.cv-pub-content { flex: 1; }

.cv-pub-title {
  font-size: 0.92rem;
  font-weight: 800;
  color: var(--text);
  line-height: 1.4;
  margin-bottom: 0.25rem;
}

.cv-pub-authors {
  font-size: 0.84rem;
  color: var(--text-sub);
  margin-bottom: 0.2rem;
}

.cv-pub-authors strong {
  color: var(--text);
  font-weight: 800;
}

.cv-pub-venue {
  font-size: 0.82rem;
  color: var(--accent);
  font-style: italic;
  font-weight: 600;
}

.cv-ref-item {
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--border);
}

.cv-ref-item:last-child { border-bottom: none; }

.cv-ref-name {
  font-size: 0.92rem;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 0.15rem;
}

.cv-ref-info {
  font-size: 0.85rem;
  color: var(--text-sub);
}

/* ── RESEARCH PAGE ── */
.research-intro {
  font-size: 0.97rem;
  color: var(--text-sub);
  line-height: 1.85;
  max-width: 700px;
  margin-bottom: 2.5rem;
}

.research-areas {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.2rem;
  margin-bottom: 3rem;
}

.research-card {
  background: var(--card);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: all var(--transition);
}

.research-card:hover {
  background: var(--card-hover);
  border-color: var(--accent);
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.research-card-icon {
  font-size: 1.7rem;
  margin-bottom: 0.8rem;
}

.research-card-title {
  font-size: 0.97rem;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 0.5rem;
}

.research-card-desc {
  font-size: 0.85rem;
  color: var(--text-sub);
  line-height: 1.65;
}

/* ── PROJECTS PAGE ── */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.2rem;
}

@media (max-width: 1020px) {
  .projects-grid { grid-template-columns: repeat(2, 1fr); }
}

.project-card {
  background: var(--card);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 1.6rem;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}

.project-card:hover {
  background: var(--card-hover);
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.project-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}

.project-status {
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: 6px;
  padding: 0.2rem 0.65rem;
  font-size: 0.73rem;
  font-weight: 800;
  white-space: nowrap;
}

.project-status.ongoing {
  background: #e8f8ee;
  color: #3a9e6a;
}

[data-theme="dark"] .project-status.ongoing {
  background: #1a3028;
  color: #68d098;
}

.project-title {
  font-size: 1rem;
  font-weight: 800;
  color: var(--text);
  line-height: 1.35;
}

.project-desc {
  font-size: 0.875rem;
  color: var(--text-sub);
  line-height: 1.7;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.3rem;
}

.tech-tag {
  background: var(--bg-2);
  color: var(--text-light);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.2rem 0.65rem;
  font-size: 0.76rem;
  font-weight: 700;
}

.project-venue {
  font-size: 0.83rem;
  color: var(--accent);
  font-weight: 700;
  font-style: italic;
}

/* ── Page Header ── */
.page-hero {
  padding: 2rem 0 2.5rem;
  border-bottom: 1.5px solid var(--border);
  margin-bottom: 2.8rem;
}

.page-hero-title {
  font-size: 2rem;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 0.4rem;
}

.page-hero-sub {
  font-size: 0.92rem;
  color: var(--text-sub);
}

/* compact header (no border, less gap) */
.pub-page-header {
  padding: 2rem 0 1.4rem;
  margin-bottom: 1.4rem;
}

.pub-header-note {
  font-size: 0.82rem;
  font-weight: 400;
  color: var(--text-light);
  margin-left: 0.7rem;
  vertical-align: middle;
}

/* ── Project List (compact row style) ── */
.projects-list {
  display: flex;
  flex-direction: column;
}

details.project-row {
  border-bottom: 1px solid var(--border);
  border-left: 3px solid transparent;
  padding-left: 1rem;
  transition: border-color var(--transition), background var(--transition);
}

details.project-row:first-child { border-top: 1px solid var(--border); }

details.project-row { border-left-color: var(--accent); }

details.project-row[open] { background: var(--bg-2); border-radius: 0 8px 8px 0; }

details.project-row > summary {
  list-style: none;
  padding: 0.9rem 0.2rem;
  cursor: pointer;
  user-select: none;
}

details.project-row > summary::-webkit-details-marker { display: none; }

.proj-summary-main {
  display: flex;
  align-items: center;
  gap: 0.7rem;
}

.proj-title {
  flex: 1;
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.4;
}

.proj-org-tag {
  color: var(--accent);
  font-weight: 700;
}

.proj-cat {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--text-light);
  border: 1.5px solid var(--border);
  border-radius: 4px;
  padding: 0.1rem 0.45rem;
  white-space: nowrap;
  flex-shrink: 0;
}

.proj-date {
  font-size: 0.78rem;
  color: var(--text-light);
  white-space: nowrap;
  font-weight: 600;
  flex-shrink: 0;
}

.proj-chevron {
  font-size: 0.68rem;
  color: var(--text-light);
  flex-shrink: 0;
  transition: transform var(--transition);
}

details.project-row[open] .proj-chevron { transform: rotate(180deg); }

.proj-venue-tag {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-sub);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.18rem 0.6rem;
}

.proj-body {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  padding: 0.4rem 0.2rem 1.1rem 0;
}

.proj-body .proj-venue-tag { align-self: flex-start; }

.proj-desc {
  font-size: 0.875rem;
  color: var(--text-sub);
  line-height: 1.72;
  margin: 0;
}

.proj-list {
  margin: 0;
  padding-left: 1.2rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.proj-list li {
  font-size: 0.875rem;
  color: var(--text-sub);
  line-height: 1.65;
}

.project-meta-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

/* ── Posts listing ── */
.posts-subtitle {
  font-size: 0.95rem;
  color: var(--text-light);
  margin-top: 0.3rem;
  font-weight: 500;
}

.posts-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-top: 0.5rem;
}

.post-card-link {
  text-decoration: none;
  color: inherit;
}

.post-card {
  padding: 1.6rem 0;
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}

.post-card:first-of-type { border-top: 1px solid var(--border); }

.post-card-link:hover .post-card { background: var(--bg-2); padding-left: 0.8rem; border-radius: 0 8px 8px 0; border-left: 3px solid var(--accent); }

.post-card.has-thumb { display: flex; align-items: flex-start; gap: 1.2rem; }
.post-card-text { flex: 1; min-width: 0; }
.post-card-thumb {
  width: 80px;
  height: 80px;
  object-fit: cover;
  border-radius: 8px;
  flex-shrink: 0;
  align-self: center;
}

.post-card-date {
  font-size: 0.78rem;
  color: var(--text-light);
  font-weight: 600;
  margin: 0 0 0.35rem 0;
}

.post-card-title {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--text);
  margin: 0 0 0.55rem 0;
  line-height: 1.4;
}

.post-card-excerpt {
  font-size: 0.875rem;
  color: var(--text-sub);
  line-height: 1.7;
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ── Single post page ── */
.post-page { max-width: 900px; }

.post-header {
  margin-bottom: 2.5rem;
}

.post-back {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--accent);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-bottom: 1.2rem;
}

.post-back:hover { color: var(--accent-hover); }

.post-date {
  font-size: 0.82rem;
  color: var(--text-light);
  font-weight: 600;
  margin: 0 0 0.6rem 0;
}

.post-title {
  font-size: 1.7rem;
  font-weight: 900;
  line-height: 1.3;
  color: var(--text);
  margin: 0;
}

.post-body {
  font-size: 0.97rem;
  line-height: 1.85;
  color: var(--text-sub);
}

.post-body p {
  margin: 0 0 1.3rem 0;
}

.post-body h2 {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text);
  margin: 2.2rem 0 0.9rem 0;
}

.post-quote {
  border-left: 3px solid var(--accent);
  margin: 1.6rem 0;
  padding: 0.7rem 1.2rem;
  background: var(--bg-2);
  border-radius: 0 8px 8px 0;
  font-style: italic;
  font-size: 0.97rem;
  color: var(--text);
  font-weight: 600;
  line-height: 1.7;
}

.post-figure {
  float: right;
  margin: 0.2rem 0 1.2rem 1.8rem;
  width: 320px;
}

.post-img {
  width: 100%;
  border-radius: 10px;
  display: block;
}

.post-body::after {
  content: "";
  display: table;
  clear: both;
}

@media (max-width: 640px) {
  .post-figure {
    float: none;
    width: 100%;
    margin: 1rem 0;
  }
}

.post-divider {
  border: none;
  border-top: 1.5px solid var(--border);
  margin: 2.5rem 0;
}

/* ── Posts empty state ── */
.posts-empty {
  padding: 4rem 0;
  text-align: center;
  color: var(--text-light);
  font-size: 1rem;
  font-weight: 600;
}

/* ── Footer ── */
footer {
  border-top: 1.5px solid var(--border);
  padding: 1.8rem 2.5rem;
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-light);
  font-weight: 600;
}

footer a { color: var(--accent); }

/* ── Mobile Responsive ── */
.hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.3rem;
  color: var(--text);
  font-size: 1.3rem;
}

@media (max-width: 768px) {
  nav { padding: 0 1.2rem; }

  .nav-links {
    display: none;
    position: absolute;
    top: 62px;
    left: 0;
    right: 0;
    background: var(--nav-bg);
    backdrop-filter: blur(14px);
    flex-direction: column;
    padding: 1rem;
    border-bottom: 1px solid var(--border);
    gap: 0.2rem;
  }

  .nav-links.open { display: flex; }

  .hamburger { display: block; }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .about-left {
    position: static;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
  }

  .profile-photo-wrap { width: 150px; height: 150px; }

  .about-name { font-size: 1.8rem; }

  .projects-grid { grid-template-columns: 1fr; }

  .research-areas { grid-template-columns: 1fr; }

  .page-wrapper { padding: 2rem 1.2rem 4rem; }

  .cv-entry { grid-template-columns: 1fr; }
  .cv-entry-date, .cv-entry-loc { text-align: left; }
}

@media (max-width: 480px) {
  .about-left { flex-direction: column; }
  .about-name { font-size: 1.6rem; }
  .filter-bar { gap: 0.4rem; }
  .filter-btn { font-size: 0.8rem; padding: 0.35rem 0.85rem; }
}