/* =========================================================
   Design tokens — Dark theme (default)
   ========================================================= */
:root {
  /* backgrounds */
  --bg:          #0c0e14;
  --bg-alt:      #111420;
  --surface:     #161a26;
  /* borders */
  --border:      rgba(255,255,255,0.07);
  /* text */
  --text:        #e2e4ec;
  --text-muted:  #7a7f9a;
  --text-heading:#ffffff;
  /* accent */
  --accent:      #7b9cff;
  --accent-dim:  rgba(123,156,255,0.1);
  --accent-warm: #c8a96e;
  /* nav */
  --nav-scroll-bg: rgba(12,14,20,0.93);
  --nav-mobile-bg: rgba(12,14,20,0.97);
  /* misc */
  --wip-h: 36px;
  --top-banner-offset: 0px;
  --nav-h:  60px;
  --ff-serif: "EB Garamond", Georgia, serif;
  --ff-sans:  "Inter", system-ui, sans-serif;
  --ease:   cubic-bezier(0.22, 1, 0.36, 1);
  --radius: 3px;
}

html.has-wip-banner {
  --top-banner-offset: var(--wip-h);
}

/* =========================================================
   Light theme overrides
   ========================================================= */
[data-theme="light"] {
  --bg:          #f7f6f2;
  --bg-alt:      #edecea;
  --surface:     #ffffff;
  --border:      rgba(0,0,0,0.09);
  --text:        #1c1c2a;
  --text-muted:  #6b7080;
  --text-heading:#0d0d18;
  --accent:      #4060d8;
  --accent-dim:  rgba(64,96,216,0.1);
  --accent-warm: #8b6030;
  --nav-scroll-bg: rgba(247,246,242,0.94);
  --nav-mobile-bg: rgba(247,246,242,0.98);
}

/* =========================================================
   Theme transition — smooth switching
   ========================================================= */
body,
#nav,
.section-alt,
.research-card,
.skill-group,
.project-card,
.photo-frame {
  transition:
    background-color 0.35s var(--ease),
    border-color     0.35s var(--ease),
    color            0.35s var(--ease);
}

/* =========================================================
   WIP Banner
   ========================================================= */
.wip-banner {
  position: sticky;
  top: 0;
  z-index: 120;
  display: flex;
  align-items: center;
  justify-content: center;
  height: var(--wip-h);
  background: color-mix(in srgb, var(--accent-warm) 14%, var(--bg));
  border-bottom: 1px solid var(--accent-warm);
  color: var(--accent-warm);
  text-align: center;
  font-family: var(--ff-sans);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  padding: 0 1rem;
  white-space: nowrap;
}
.wip-banner[hidden] { display: none; }

/* =========================================================
   Coming Soon placeholder
   ========================================================= */
.coming-soon {
  color: var(--text-muted);
  font-family: var(--ff-serif);
  font-style: italic;
  font-size: 1.05rem;
  letter-spacing: 0.04em;
  padding: 2.5rem 0;
  text-align: center;
  opacity: 0.7;
}

/* =========================================================
   Reset & base
   ========================================================= */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + var(--top-banner-offset));
  font-size: 16px;
}
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--ff-sans);
  font-weight: 400;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img, svg { display: block; }
ul, ol { list-style: none; }
button { font-family: inherit; }

/* =========================================================
   Navigation
   ========================================================= */
#nav {
  position: fixed;
  top: var(--top-banner-offset); left: 0; right: 0;
  z-index: 100;
  height: var(--nav-h);
  transition:
    background 0.4s var(--ease),
    box-shadow 0.4s var(--ease);
}
#nav.scrolled {
  background: var(--nav-scroll-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 1px 0 var(--border);
}
.nav-inner {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 1.75rem;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}
.nav-logo {
  font-family: var(--ff-serif);
  font-size: 1.2rem;
  letter-spacing: 0.02em;
  color: var(--accent);
  flex-shrink: 0;
  margin-right: auto;
}
.nav-links {
  display: flex;
  gap: 1.6rem;
  align-items: center;
}
.nav-links a {
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--text-muted);
  transition: color 0.2s;
  white-space: nowrap;
}
.nav-links a:hover,
.nav-links a.active { color: var(--text); }

.nav-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

/* Theme toggle */
.theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  padding: 4px;
  display: flex;
  align-items: center;
  border-radius: var(--radius);
  transition: color 0.2s;
}
.theme-toggle:hover { color: var(--text); }
.theme-toggle svg { width: 16px; height: 16px; }

/* Language switch */
.lang-switch {
  display: flex;
  align-items: center;
  gap: 0.2rem;
}
.lang-btn {
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.2rem 0.1rem;
  transition: color 0.2s;
}
.lang-btn.active { color: var(--accent); }
.lang-btn:hover  { color: var(--text); }
.lang-sep { color: var(--border); font-size: 0.8rem; }

/* Mobile toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 20px;
  height: 1.5px;
  background: var(--text);
  transition: transform 0.3s, opacity 0.3s;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* =========================================================
   Hero
   ========================================================= */
#hero {
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding: calc(var(--nav-h) + 5rem) 2rem 7rem;
  position: relative;
  overflow: hidden;
}
#hero::before {
  content: "";
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse 60% 55% at 15% 40%, rgba(123,156,255,0.06) 0%, transparent 70%),
    radial-gradient(ellipse 50% 40% at 85% 65%, rgba(200,169,110,0.04) 0%, transparent 70%);
  pointer-events: none;
}
[data-theme="light"] #hero::before {
  background:
    radial-gradient(ellipse 60% 55% at 15% 40%, rgba(64,96,216,0.05) 0%, transparent 70%),
    radial-gradient(ellipse 50% 40% at 85% 65%, rgba(139,96,48,0.04) 0%, transparent 70%);
}
.hero-content { max-width: 820px; margin: 0 auto; }
.hero-label {
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.25rem;
}
.hero-name {
  font-family: var(--ff-serif);
  font-size: clamp(3rem, 9vw, 7rem);
  font-weight: 500;
  line-height: 1.02;
  letter-spacing: -0.015em;
  color: var(--text-heading);
  margin-bottom: 1.5rem;
}
.hero-affiliation {
  display: inline-block;
  font-size: 0.9rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  margin-bottom: 1.5rem;
  transition: color 0.2s var(--ease);
}
.hero-affiliation:hover,
.hero-affiliation:focus-visible { color: var(--accent); }
.hero-bio {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 560px;
  margin-bottom: 2.5rem;
  line-height: 1.8;
}
.hero-cta { display: flex; gap: 1rem; flex-wrap: wrap; }
.btn {
  display: inline-flex;
  align-items: center;
  padding: 0.65rem 1.5rem;
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  border-radius: var(--radius);
  transition: all 0.25s var(--ease);
  cursor: pointer;
  border: none;
}
.btn-primary { background: var(--accent); color: var(--bg); }
.btn-primary:hover { opacity: 0.82; transform: translateY(-2px); }
.btn-ghost { border: 1px solid var(--border); color: var(--text); background: transparent; }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }
#heroGithubLink {
  background: #24292f;
  border: 1px solid #24292f;
  color: #f6f8fa;
}
#heroGithubLink:hover {
  background: #0d1117;
  border-color: #0d1117;
  color: #ffffff;
  transform: translateY(-2px);
}
[data-theme="light"] #heroGithubLink {
  background: #24292f;
  border-color: #24292f;
  color: #f6f8fa;
}
.hero-scroll-hint {
  position: absolute;
  bottom: 2.5rem; left: 50%;
  transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 0.5rem;
  color: var(--text-muted);
  font-size: 0.62rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}
.scroll-line {
  width: 1px; height: 42px;
  background: linear-gradient(to bottom, var(--text-muted), transparent);
  animation: scrollPulse 2.2s ease-in-out infinite;
}
@keyframes scrollPulse {
  0%,100% { opacity: 0.3; transform: scaleY(1);   }
  50%      { opacity: 1;   transform: scaleY(1.1); }
}

/* =========================================================
   Sections
   ========================================================= */
.section     { padding: 7rem 2rem; }
.section-alt { background: var(--bg-alt); }
.container   { max-width: 1100px; margin: 0 auto; }

.section-header {
  display: flex; align-items: baseline; gap: 1rem;
  margin-bottom: 3rem;
}
.section-number {
  font-family: var(--ff-serif);
  font-size: 0.82rem; color: var(--accent);
  letter-spacing: 0.08em; opacity: 0.6;
}
.section-title {
  font-family: var(--ff-serif);
  font-size: clamp(1.8rem, 3.2vw, 2.7rem);
  font-weight: 500; letter-spacing: -0.015em;
  line-height: 1.1; color: var(--text-heading);
}
.section-lead {
  font-size: 1rem; color: var(--text-muted);
  max-width: 680px; margin-bottom: 3rem; line-height: 1.85;
}

/* =========================================================
   Reveal animation
   ========================================================= */
.reveal {
  opacity: 0; transform: translateY(22px);
  transition: opacity 0.65s var(--ease), transform 0.65s var(--ease);
}
.reveal.visible { opacity: 1; transform: none; }

/* =========================================================
   About
   ========================================================= */
.about-grid {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 4rem;
  align-items: start;
}
.photo-frame {
  width: 200px; height: 200px;
  border-radius: 50%; overflow: hidden;
  border: 1px solid var(--border);
  background: var(--surface);
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto;
}
.photo-placeholder {
  width: 100%; height: 100%;
  display: flex; align-items: center; justify-content: center;
  color: var(--text-muted);
}
.photo-placeholder svg { width: 80px; height: 80px; }
.photo-frame img { width: 100%; height: 100%; object-fit: cover; }

.about-links {
  display: flex; flex-wrap: wrap; gap: 0.5rem;
  justify-content: center; margin-top: 1.25rem;
}
.icon-link {
  display: inline-flex; align-items: center; gap: 0.35em;
  font-size: 0.72rem; font-weight: 500; letter-spacing: 0.07em; text-transform: uppercase;
  color: var(--text-muted);
  border: 1px solid var(--border); padding: 0.35rem 0.75rem;
  border-radius: var(--radius); transition: color 0.2s, border-color 0.2s;
}
.icon-link svg { width: 13px; height: 13px; flex-shrink: 0; }
.icon-link:hover { color: var(--accent); border-color: var(--accent); }
.icon-link.is-disabled {
  opacity: 0.55;
  cursor: default;
  pointer-events: none;
}

.about-text { display: flex; flex-direction: column; gap: 1.75rem; }
.about-block-title {
  font-size: 0.7rem; font-weight: 600; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 0.6rem;
}
.about-p { font-size: 0.95rem; color: var(--text-muted); line-height: 1.85; }
.about-link {
  display: inline-block;
  transition: color 0.2s var(--ease);
}
.about-link:hover,
.about-link:focus-visible { color: var(--accent); }
.about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.85rem;
}
.about-fact {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.95rem 1rem;
}
.about-fact-label {
  font-size: 0.66rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.35rem;
}
.about-fact-value {
  font-size: 0.84rem;
  color: var(--text-muted);
  line-height: 1.7;
}
.about-fact-list {
  margin: 0;
  padding-left: 1.1rem;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}
.about-fact-item {
  color: var(--text-muted);
}
.about-fact-item-title {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text);
}
.about-fact-item-desc {
  display: block;
  margin-top: 0.12rem;
  font-size: 0.8rem;
  line-height: 1.65;
}

/* =========================================================
   Research
   ========================================================= */
.research-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
  gap: 1.25rem;
}
.research-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.75rem;
  transition: border-color 0.25s, transform 0.25s var(--ease),
              background-color 0.35s var(--ease);
}
.research-card:hover { border-color: rgba(123,156,255,0.28); transform: translateY(-3px); }
[data-theme="light"] .research-card:hover { border-color: rgba(64,96,216,0.28); }
.research-media {
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-radius: calc(var(--radius) - 4px);
  margin-bottom: 1rem;
  background: color-mix(in srgb, var(--surface) 70%, var(--accent-dim));
  padding: 0;
}
.research-media img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
  display: block;
}
.research-card h3 {
  font-family: var(--ff-serif); font-size: 1.1rem;
  font-weight: 500; color: var(--text-heading); margin-bottom: 0.6rem;
}
.research-period {
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.45rem;
}
.research-card p { font-size: 0.88rem; color: var(--text-muted); line-height: 1.78; }
.research-tags { display: flex; flex-wrap: wrap; gap: 0.35rem; margin-top: 1rem; }
.research-links { display: flex; flex-wrap: wrap; gap: 0.6rem; margin-top: 0.9rem; }
.tag {
  font-size: 0.66rem; letter-spacing: 0.07em; text-transform: uppercase;
  color: var(--accent); background: var(--accent-dim);
  padding: 0.18rem 0.55rem; border-radius: 2px;
}

/* =========================================================
   Publications
   ========================================================= */
.pub-tabs {
  display: flex; margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}
.pub-tab {
  font-size: 0.8rem; font-weight: 500; letter-spacing: 0.07em; text-transform: uppercase;
  color: var(--text-muted); background: none; border: none;
  padding: 0.6rem 1.25rem 0.75rem; cursor: pointer;
  border-bottom: 2px solid transparent; margin-bottom: -1px;
  transition: color 0.2s, border-color 0.2s;
}
.pub-tab.active { color: var(--accent); border-bottom-color: var(--accent); }
.pub-tab:hover:not(.active) { color: var(--text); }

.pub-filters {
  display: flex; gap: 0.4rem; margin-bottom: 2rem; flex-wrap: wrap;
}
.pub-filter {
  font-size: 0.7rem; font-weight: 500; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--text-muted); background: none;
  border: 1px solid var(--border); border-radius: 2px;
  padding: 0.3rem 0.8rem; cursor: pointer; transition: all 0.2s;
}
.pub-filter.active,
.pub-filter:hover { color: var(--accent); border-color: var(--accent); background: var(--accent-dim); }

.pub-filter-sep {
  width: 1px; background: var(--border); margin: 0 0.4rem; align-self: stretch;
}
.pub-filter-toggle {
  font-size: 0.7rem; font-weight: 500; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--text-muted); background: none;
  border: 1px solid var(--border); border-radius: 2px;
  padding: 0.3rem 0.8rem; cursor: pointer; transition: all 0.2s;
}
.pub-filter-toggle:hover { color: var(--accent-warm); border-color: var(--accent-warm); }
.pub-filter-toggle.active {
  color: var(--accent-warm); border-color: var(--accent-warm);
  background: color-mix(in srgb, var(--accent-warm) 12%, transparent);
}

.pub-list { display: flex; flex-direction: column; }
.pub-item {
  display: grid; grid-template-columns: 2rem 1fr;
  gap: 0 1.75rem; padding: 1.75rem 0;
  border-bottom: 1px solid var(--border);
}
.pub-item.hidden { display: none; }
.pub-num { font-family: var(--ff-serif); font-size: 0.85rem; color: var(--text-muted); padding-top: 0.15rem; text-align: right; }
.pub-title {
  font-family: var(--ff-serif); font-size: 1.02rem; font-weight: 500;
  color: var(--text-heading); line-height: 1.4; margin-bottom: 0.3rem;
}
.pub-authors { font-size: 0.82rem; color: var(--text-muted); margin-bottom: 0.2rem; }
.pub-venue   { font-size: 0.82rem; font-style: italic; color: var(--text-muted); margin-bottom: 0.6rem; }
.pub-venue-link {
  color: inherit;
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.2s var(--ease);
}
.pub-venue-link:hover,
.pub-venue-link:focus-visible { color: var(--accent); }
.pub-links   { display: flex; gap: 0.6rem; flex-wrap: wrap; }
.pub-link {
  font-size: 0.68rem; font-weight: 500; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--accent); border: 1px solid rgba(123,156,255,0.28);
  padding: 0.18rem 0.55rem; border-radius: 2px; transition: background 0.2s;
}
[data-theme="light"] .pub-link { border-color: rgba(64,96,216,0.28); }
.pub-link:hover { background: var(--accent-dim); }
.pub-badge {
  display: inline-block; font-size: 0.62rem; font-weight: 600; letter-spacing: 0.1em;
  text-transform: uppercase; padding: 0.12rem 0.45rem; border-radius: 2px;
  margin-left: 0.5rem; vertical-align: middle;
}
.badge-fullpaper { background: rgba(123,156,255,0.12); color: var(--accent); }
.badge-poster    { background: rgba(100,220,160,0.12); color: #64dca0; }
.badge-demo      { background: rgba(200,169,110,0.12); color: var(--accent-warm); }

/* Talks list */
.talks-list { display: flex; flex-direction: column; }
.talk-item {
  display: grid; grid-template-columns: 120px 1fr;
  gap: 0 2rem; padding: 1.25rem 0;
  border-bottom: 1px solid var(--border);
}
.talk-year  { font-size: 0.78rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--text-muted); padding-top: 0.1rem; }
.talk-title { font-family: var(--ff-serif); font-size: 1rem; color: var(--text-heading); margin-bottom: 0.2rem; }
.talk-venue { font-size: 0.82rem; font-style: italic; color: var(--text-muted); }

/* =========================================================
   Projects
   ========================================================= */
.projects-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.25rem;
}
.project-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden;
  display: flex; flex-direction: column;
  transition: border-color 0.25s, transform 0.25s var(--ease),
              background-color 0.35s var(--ease);
}
.project-card:hover { border-color: rgba(123,156,255,0.28); transform: translateY(-3px); }
[data-theme="light"] .project-card:hover { border-color: rgba(64,96,216,0.28); }
.project-media {
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: color-mix(in srgb, var(--surface) 70%, var(--accent-dim));
  padding: 0;
}
.project-media img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
  display: block;
}
.project-gallery-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  padding: 0.95rem 1.6rem 0;
}
.project-gallery-btn {
  font-size: 0.66rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.35rem 0.7rem;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s, background-color 0.2s;
}
.project-gallery-btn:hover,
.project-gallery-btn.active {
  color: var(--accent);
  border-color: rgba(123,156,255,0.35);
  background: var(--accent-dim);
}
.project-header {
  padding: 1.5rem 1.6rem 0;
  display: flex; align-items: flex-start; justify-content: space-between; gap: 1rem;
}
.project-title-wrap { min-width: 0; }
.project-period {
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
}
.project-title { font-family: var(--ff-serif); font-size: 1.1rem; font-weight: 500; color: var(--text-heading); }
.project-ext   { color: var(--text-muted); flex-shrink: 0; transition: color 0.2s; }
.project-card:hover .project-ext { color: var(--accent); }
.project-ext svg { width: 15px; height: 15px; }
.project-body { padding: 0.7rem 1.6rem 1.4rem; flex: 1; }
.project-desc { font-size: 0.86rem; color: var(--text-muted); line-height: 1.78; margin-bottom: 0.9rem; }
.project-stack { display: flex; flex-wrap: wrap; gap: 0.35rem; }
.project-actions { display: flex; flex-direction: column; gap: 0.85rem; margin-top: 1rem; }
.project-detail-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: fit-content;
  min-height: 2.4rem;
  padding: 0.5rem 0.95rem;
  border-radius: 999px;
  border: 1px solid rgba(123,156,255,0.32);
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: background-color 0.2s, border-color 0.2s;
}
.project-detail-link:hover { background: var(--accent-dim); border-color: rgba(123,156,255,0.5); }
.project-links { display: flex; flex-wrap: wrap; gap: 0.6rem; margin-top: 1rem; }
.project-actions .project-links { margin-top: 0; }
.stack-tag {
  font-size: 0.66rem; letter-spacing: 0.05em;
  color: var(--text-muted); border: 1px solid var(--border);
  padding: 0.12rem 0.45rem; border-radius: 2px;
}

/* =========================================================
   Articles
   ========================================================= */
.articles-list { display: flex; flex-direction: column; }
.article-item {
  display: grid; grid-template-columns: 100px 1fr auto;
  gap: 0 1.75rem; padding: 1.25rem 0;
  border-bottom: 1px solid var(--border);
  align-items: center;
  transition: opacity 0.2s;
}
.article-item:hover  { opacity: 0.72; }
.article-date   { font-size: 0.75rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--text-muted); }
.article-title  { font-size: 0.95rem; color: var(--text); }
.article-source { font-size: 0.72rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--text-muted); }

/* =========================================================
   Skills
   ========================================================= */
.skills-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1.25rem;
}
.skill-group {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.5rem;
  transition: background-color 0.35s var(--ease), border-color 0.35s var(--ease);
}
.skill-group-title {
  font-size: 0.68rem; font-weight: 600; letter-spacing: 0.13em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 1rem;
}
.skill-items { display: flex; flex-direction: column; gap: 0.7rem; }
.skill-item  { display: flex; flex-direction: column; gap: 0.28rem; }
.skill-item[data-dynamic-skill] { gap: 0.72rem; }
.skill-label { font-size: 0.82rem; color: var(--text-muted); }
.skill-link {
  color: inherit;
  text-decoration: none;
}
.skill-link:hover { color: var(--accent); }
.skill-item[data-skill-tone] .skill-label { color: var(--skill-tone); }
.skill-item[data-skill-tone] .skill-bar { background: var(--skill-tone-soft); }
.skill-item[data-skill-tone] .skill-fill { background: var(--skill-tone); }
.skill-item[data-skill-tone="gray"]   { --skill-tone: #9aa3b2; --skill-tone-soft: rgba(154,163,178,0.22); }
.skill-item[data-skill-tone="brown"]  { --skill-tone: #a36b43; --skill-tone-soft: rgba(163,107,67,0.22); }
.skill-item[data-skill-tone="green"]  { --skill-tone: #39a36a; --skill-tone-soft: rgba(57,163,106,0.22); }
.skill-item[data-skill-tone="cyan"]   { --skill-tone: #29a8c7; --skill-tone-soft: rgba(41,168,199,0.22); }
.skill-item[data-skill-tone="blue"]   { --skill-tone: #4b7dff; --skill-tone-soft: rgba(75,125,255,0.22); }
.skill-item[data-skill-tone="yellow"] { --skill-tone: #d0a81d; --skill-tone-soft: rgba(208,168,29,0.22); }
.skill-item[data-skill-tone="orange"] { --skill-tone: #ea8b2e; --skill-tone-soft: rgba(234,139,46,0.22); }
.skill-item[data-skill-tone="red"]    { --skill-tone: #e05555; --skill-tone-soft: rgba(224,85,85,0.22); }
.skill-item[data-skill-tone="violet"] { --skill-tone: #9b6dff; --skill-tone-soft: rgba(155,109,255,0.22); }
.skill-detail {
  font-size: 0.72rem;
  color: var(--text-muted);
  line-height: 1.55;
}
.skill-detail a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.skill-bar   { height: 2px; background: var(--border); border-radius: 1px; overflow: hidden; }
.skill-fill  {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-warm));
  border-radius: 1px; width: 0;
  transition: width 1.3s var(--ease);
}

/* =========================================================
   Education / Timeline
   ========================================================= */
.edu-subtitle {
  margin: 0 0 1rem;
  font-size: 0.74rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}
.timeline { position: relative; display: flex; flex-direction: column; }
.timeline::before {
  content: "";
  position: absolute; left: 8px; top: 7px; bottom: 0;
  width: 1px; background: var(--border);
}
.timeline-item {
  display: grid; grid-template-columns: 18px 1fr;
  gap: 0 1.75rem; padding-bottom: 2.5rem; position: relative;
}
.timeline-dot {
  width: 8px; height: 8px;
  background: var(--accent); border-radius: 50%;
  margin-top: 7px; flex-shrink: 0;
  position: relative; z-index: 1;
  box-shadow: 0 0 0 3px var(--bg);
  transition: box-shadow 0.35s var(--ease), background-color 0.35s var(--ease);
}
.section-alt .timeline-dot { box-shadow: 0 0 0 3px var(--bg-alt); }
.timeline-period {
  font-size: 0.7rem; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--accent); font-weight: 500; margin-bottom: 0.2rem;
}
.timeline-title {
  font-family: var(--ff-serif); font-size: 1.08rem;
  font-weight: 500; color: var(--text-heading); margin-bottom: 0.12rem;
}
.timeline-sub  { font-size: 0.85rem; color: var(--text-muted); font-style: italic; margin-bottom: 0.45rem; }
.timeline-desc { font-size: 0.85rem; color: var(--text-muted); line-height: 1.78; }
.timeline-desc a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.timeline-link {
  display: inline-block;
  margin-top: 0.55rem;
  font-size: 0.74rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--accent);
}
.experience-list {
  display: flex;
  flex-direction: column;
  margin-top: 0.5rem;
}
.experience-item {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 0 2rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--border);
}
.experience-period {
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  padding-top: 0.1rem;
}
.experience-title {
  font-family: var(--ff-serif);
  font-size: 1rem;
  color: var(--text-heading);
  margin-bottom: 0.16rem;
}
.experience-sub {
  font-size: 0.82rem;
  color: var(--text-muted);
  font-style: italic;
  margin-bottom: 0.45rem;
}
.experience-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.78;
}
.experience-desc a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* =========================================================
   News
   ========================================================= */
.news-list { display: flex; flex-direction: column; }
.news-item {
  display: grid; grid-template-columns: 110px 1fr;
  gap: 0 1.75rem; padding: 1.2rem 0;
  border-bottom: 1px solid var(--border);
}
.news-date { font-size: 0.75rem; letter-spacing: 0.07em; text-transform: uppercase; color: var(--text-muted); padding-top: 0.12rem; }
.news-text { font-size: 0.92rem; color: var(--text-muted); line-height: 1.7; }
.news-text a { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; }

/* =========================================================
   Contact
   ========================================================= */
.contact-container { text-align: center; }
.contact-container .section-header { justify-content: center; }
.contact-container .section-lead   { margin: 0 auto 2.5rem; }
.contact-info {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.7rem;
}
.contact-email {
  font-family: var(--ff-serif);
  font-size: clamp(1.2rem, 2.5vw, 2rem);
  color: var(--accent);
  text-decoration: underline; text-underline-offset: 6px;
  transition: opacity 0.2s;
}
.contact-email:hover { opacity: 0.65; }
.contact-email-secondary {
  font-size: clamp(0.95rem, 1.8vw, 1.2rem);
  text-underline-offset: 4px;
}
.contact-social {
  display: flex; gap: 0.7rem; justify-content: center;
  flex-wrap: wrap; margin-top: 1.75rem;
}
.social-pill {
  font-size: 0.74rem; font-weight: 500; letter-spacing: 0.07em; text-transform: uppercase;
  color: var(--text-muted); border: 1px solid var(--border);
  border-radius: 20px; padding: 0.38rem 1rem; transition: color 0.2s, border-color 0.2s;
}
.social-pill:hover { color: var(--accent); border-color: var(--accent); }
.social-pill.is-disabled {
  opacity: 0.55;
  cursor: default;
  pointer-events: none;
}

/* =========================================================
   Footer
   ========================================================= */
#footer { padding: 2rem; border-top: 1px solid var(--border); text-align: center; }
#footer p { font-size: 0.8rem; color: var(--text-muted); line-height: 1.9; }

/* =========================================================
   Section "see more" link
   ========================================================= */
.section-more {
  text-align: right;
  margin-top: 2rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
}
.section-more-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s;
}
.section-more-link:hover { color: var(--accent); }

/* =========================================================
   Sub-page layout
   ========================================================= */
.subpage-section {
  padding-top: calc(var(--nav-h) + 4rem);
  min-height: 60vh;
}
.subpage-section + .section { padding-top: 0; }
.nav-back {
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
  transition: color 0.2s;
}
.nav-back:hover { color: var(--accent); }

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width: 900px) {
  .nav-links { gap: 1.1rem; }
  .nav-links a { font-size: 0.66rem; }
}

@media (max-width: 768px) {
  .nav-links {
    display: none; flex-direction: column;
    position: fixed; top: calc(var(--nav-h) + var(--top-banner-offset)); left: 0; right: 0;
    background: var(--nav-mobile-bg);
    backdrop-filter: blur(14px);
    padding: 1.5rem 2rem; gap: 1.25rem;
    border-bottom: 1px solid var(--border);
  }
  .nav-links.open { display: flex; }
  .nav-links a { font-size: 0.88rem; }
  .nav-toggle { display: flex; }

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

  .pub-item { grid-template-columns: 1fr; gap: 0.2rem; }
  .pub-num  { display: none; }

  .talk-item    { grid-template-columns: 1fr; gap: 0.15rem; }
  .experience-item { grid-template-columns: 1fr; gap: 0.15rem; }
  .news-item    { grid-template-columns: 1fr; gap: 0.15rem; }
  .article-item { grid-template-columns: 1fr; gap: 0.1rem; }
  .article-source { display: none; }

  .timeline::before { left: 7px; }
}

@media (max-width: 480px) {
  .section { padding: 5rem 1.25rem; }
  .hero-cta { flex-direction: column; }
  .btn { width: 100%; justify-content: center; }
}

/* =========================================================
   News FAB (floating action button)
   ========================================================= */
.news-fab {
  position: fixed;
  bottom: 2rem; right: 2rem;
  z-index: 190;
  display: flex;
  align-items: center;
  gap: 0.45rem;
  background: var(--accent);
  color: var(--bg);
  border: none;
  border-radius: 24px;
  padding: 0.6rem 1.1rem 0.6rem 0.85rem;
  font-family: var(--ff-sans);
  font-size: 0.74rem;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  cursor: pointer;
  box-shadow: 0 4px 22px rgba(0,0,0,0.28);
  transition: transform 0.22s var(--ease), box-shadow 0.22s var(--ease), opacity 0.22s var(--ease);
}
.news-fab:hover { transform: translateY(-2px); box-shadow: 0 6px 28px rgba(0,0,0,0.38); }
.news-fab svg { width: 14px; height: 14px; flex-shrink: 0; }
.news-fab.hidden { opacity: 0; pointer-events: none; transform: scale(0.88) translateY(4px); }

/* =========================================================
   News Modal
   ========================================================= */
.news-modal {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: flex-end;
  justify-content: flex-end;
  padding: 0 2rem 6rem; /* 6rem leaves room above FAB */
  pointer-events: none;
  visibility: hidden;
}
.news-modal.is-open {
  pointer-events: auto;
  visibility: visible;
}

.news-modal-backdrop {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.42);
  backdrop-filter: blur(3px);
  -webkit-backdrop-filter: blur(3px);
  opacity: 0;
  transition: opacity 0.3s var(--ease);
}
.news-modal.is-open .news-modal-backdrop { opacity: 1; }

.news-modal-panel {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  width: 400px;
  max-width: calc(100vw - 2rem);
  max-height: 62vh;
  display: flex;
  flex-direction: column;
  transform: translateY(14px);
  opacity: 0;
  transition: transform 0.35s var(--ease), opacity 0.35s var(--ease),
              background-color 0.35s var(--ease), border-color 0.35s var(--ease);
  box-shadow: 0 20px 60px rgba(0,0,0,0.4);
}
.news-modal.is-open .news-modal-panel { transform: none; opacity: 1; }

.news-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.1rem 1.4rem;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.news-modal-header h3 {
  font-family: var(--ff-serif);
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--text-heading);
}
.news-modal-close {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  transition: color 0.2s, background 0.2s;
}
.news-modal-close svg { width: 16px; height: 16px; }
.news-modal-close:hover { color: var(--text); background: var(--border); }

.news-modal .news-list {
  overflow-y: auto;
  padding: 0 1.4rem;
  overscroll-behavior: contain;
}
.news-modal .news-item {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 0 1.25rem;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--border);
}
.news-modal .news-item:last-child { border-bottom: none; }

@media (max-width: 480px) {
  .news-fab { bottom: 1.25rem; right: 1.25rem; }
  .news-modal { padding: 0 1rem 5.5rem; }
  .news-modal .news-item { grid-template-columns: 1fr; gap: 0.1rem; }
}