:root {
  --bg:          #faf8f2;
  --surface:     #ffffff;
  --text:        #1a1a2e;
  --muted:       #5c6270;
  --line:        #e5e0d6;
  --accent:      #1e2d5a;
  --accent-link: #2e4a8a;
  --accent-soft: #eef1f8;
  --gold:        #c9a84c;
  --gold-soft:   #fdf6e3;
  --shadow:      0 4px 18px rgba(30, 45, 90, 0.07);
  --radius:      16px;
  --radius-sm:   12px;
  --maxw:        1040px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
}

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

a:hover {
  text-decoration: underline;
}

.container {
  width: min(var(--maxw), calc(100% - 2rem));
  margin: 0 auto;
}

/* Header / Nav */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--accent);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  gap: 1rem;
}

.brand {
  font-weight: 700;
  color: #ffffff;
  letter-spacing: 0.2px;
}

.brand:hover {
  text-decoration: none;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex-wrap: wrap;
}

.nav-links a {
  color: rgba(255, 255, 255, 0.75);
  padding: 0.45rem 0.75rem;
  border-radius: 10px;
  font-weight: 500;
  text-decoration: none;
}

.nav-links a:hover {
  background: rgba(255, 255, 255, 0.12);
  color: #ffffff;
}

.nav-links a.active {
  background: rgba(255, 255, 255, 0.18);
  color: #ffffff;
}

/* Hero */
.hero {
  padding: 3.5rem 0 2rem;
}

.eyebrow {
  margin: 0 0 0.5rem;
  color: var(--accent-link);
  font-weight: 600;
  letter-spacing: 0.03em;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 2.75rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--accent);
}

.hero-sub {
  margin: 0.9rem 0 0;
  max-width: 760px;
  color: var(--muted);
  font-size: 1.05rem;
}

.hero-meta {
  margin-top: 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.hero-meta span {
  color: #94a3b8;
}

.tag-row {
  margin-top: 1.1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag {
  display: inline-block;
  background: var(--accent-soft);
  border: 1px solid #d4dff0;
  border-radius: 999px;
  padding: 0.4rem 0.75rem;
  font-size: 0.85rem;
  color: var(--accent-link);
}

/* Sections */
.section {
  padding: 1.25rem 0 1.5rem;
}

.section-tight {
  padding-top: 0.5rem;
}

.section-title {
  margin: 0 0 0.75rem;
  font-size: 1.3rem;
  letter-spacing: -0.01em;
  color: var(--accent);
}

.section-heading {
  margin-bottom: 1rem;
}

.section-subtitle {
  margin: -0.25rem 0 0;
  color: var(--muted);
}

/* Cards */
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem 1rem;
  box-shadow: var(--shadow);
  transition: box-shadow 0.18s, transform 0.18s;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(30, 45, 90, 0.12);
}

.card h2, .card h3 {
  margin-top: 0;
  margin-bottom: 0.5rem;
  color: var(--accent);
}

.card p:last-child {
  margin-bottom: 0;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 1rem;
}

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

.clean-list, .pub-list {
  margin: 0.25rem 0 0;
  padding-left: 1.1rem;
}

.clean-list li, .pub-list li {
  margin: 0.45rem 0;
}

.small-note {
  margin-top: 0.75rem;
  color: var(--muted);
  font-size: 0.92rem;
}

/* Award badge (gold) */
.award-badge {
  display: inline-block;
  background: var(--gold-soft);
  color: #8a6a1a;
  border: 1px solid #e8c96a;
  border-radius: 999px;
  padding: 0.2rem 0.6rem;
  font-size: 0.78rem;
  font-weight: 700;
  margin-left: 0.4rem;
  vertical-align: middle;
}

/* Publication entries */
.pub-entry {
  padding: 0.65rem 0;
  border-bottom: 1px solid var(--line);
}

.pub-entry:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.pub-entry:first-child {
  padding-top: 0;
}

.pub-title-line {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.4rem;
}

.pub-title {
  font-weight: 600;
  color: var(--text);
}

.pub-venue {
  color: var(--muted);
  font-size: 0.9rem;
  white-space: nowrap;
}

.pub-desc {
  margin: 0.25rem 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

/* News */
.latest-news-card {
  margin-bottom: 1rem;
}

.latest-news-inner {
  background: var(--surface);
  border: 1px solid var(--line);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius);
  padding: 1rem;
  box-shadow: var(--shadow);
}

.latest-badge {
  display: inline-block;
  margin-bottom: 0.5rem;
  background: var(--accent-soft);
  color: var(--accent-link);
  border-radius: 999px;
  padding: 0.2rem 0.6rem;
  font-size: 0.78rem;
  font-weight: 700;
}

.latest-title {
  margin: 0;
  font-size: 1.08rem;
  color: var(--accent);
}

.latest-meta {
  margin-top: 0.35rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.latest-desc {
  margin-top: 0.6rem;
  color: var(--text);
}

.news-list-wrap {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.news-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.news-item {
  padding: 0.9rem 1rem;
  border-bottom: 1px solid var(--line);
}

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

.news-row {
  display: flex;
  gap: 0.75rem;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
}

.news-title {
  margin: 0;
  font-weight: 600;
}

.news-date {
  color: var(--muted);
  font-size: 0.9rem;
  white-space: nowrap;
}

.news-meta-line {
  margin-top: 0.25rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.news-desc {
  margin-top: 0.35rem;
  color: var(--text);
  font-size: 0.95rem;
}

.news-tag {
  display: inline-block;
  margin-right: 0.5rem;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-link);
  font-size: 0.78rem;
  font-weight: 600;
}

.news-tag-award {
  background: var(--gold-soft);
  color: #8a6a1a;
}

.news-tag-industry {
  background: #edf7ee;
  color: #2d6a3f;
}

/* CV page */
.page-title {
  margin: 0;
  font-size: clamp(1.6rem, 3vw, 2rem);
  color: var(--accent);
}

.page-subtitle {
  margin: 0.35rem 0 0;
  color: var(--muted);
}

.cv-header-row {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: flex-start;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.cv-actions {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  background: var(--accent);
  color: white;
  padding: 0.6rem 0.9rem;
  border-radius: 12px;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid var(--accent);
}

.btn:hover {
  text-decoration: none;
  opacity: 0.9;
}

.btn-outline {
  background: white;
  color: var(--accent);
}

.cv-frame {
  padding: 0.6rem;
}

.pdf-fallback {
  padding: 1rem;
}

.note-box {
  margin-top: 1rem;
}

.note-box code {
  background: var(--accent-soft);
  padding: 0.15rem 0.35rem;
  border-radius: 6px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

/* Footer */
.site-footer {
  margin-top: 2rem;
  border-top: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.7);
}

.footer-wrap {
  min-height: 64px;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: 0.95rem;
}

.footer-links {
  display: flex;
  gap: 0.9rem;
  flex-wrap: wrap;
  margin: 0;
}

.footer-advisor {
  width: 100%;
  text-align: center;
  padding: 0.5rem 0;
  font-size: 0.88rem;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

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

/* ── Projects page ────────────────────────────────────── */

.proj-filter-bar {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}

.proj-filter-btn {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.4rem 0.9rem;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--muted);
  cursor: pointer;
  font-family: inherit;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.proj-filter-btn:hover {
  background: var(--accent-soft);
  color: var(--accent-link);
  border-color: #c4d0e8;
}

.proj-filter-btn.active {
  background: var(--accent);
  color: #ffffff;
  border-color: var(--accent);
}

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

.proj-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.1rem 1.1rem 1rem;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  transition: box-shadow 0.18s, transform 0.18s;
}

.proj-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(30, 45, 90, 0.12);
}

.proj-card.proj-featured {
  border-left: 3px solid var(--gold);
}

.proj-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.55rem;
}

.proj-meta-left {
  display: flex;
  gap: 0.4rem;
  align-items: center;
  flex-wrap: wrap;
}

.proj-venue {
  margin: 0 0 0.5rem;
  color: var(--muted);
  font-size: 0.82rem;
}

.proj-title {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: -0.01em;
}

.proj-desc {
  margin: 0;
  color: var(--muted);
  font-size: 0.91rem;
  line-height: 1.5;
  flex: 1;
}

.proj-card-divider {
  border: none;
  border-top: 1px solid var(--line);
  margin: 0.75rem 0 0.65rem;
}

.proj-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.7rem;
}

.proj-cat {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  font-size: 0.76rem;
  font-weight: 600;
  background: var(--accent-soft);
  color: var(--accent-link);
}

.proj-cat-software {
  background: #edf7ee;
  color: #2d6a3f;
}

.proj-cat-tool {
  background: #f3f0ea;
  color: #6b5c3e;
}

.proj-status {
  display: inline-block;
  border-radius: 999px;
  padding: 0.18rem 0.55rem;
  font-size: 0.76rem;
  font-weight: 600;
}

.proj-status-published  { background: var(--accent-soft); color: var(--accent-link); }
.proj-status-active     { background: var(--gold-soft); color: #8a6a1a; border: 1px solid #e8c96a; }
.proj-status-inprogress { background: #f3f0ea; color: var(--muted); }
.proj-status-archived   { background: #f5f5f5; color: #999; }

.proj-links {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-top: auto;
  padding-top: 0.5rem;
}

.proj-link {
  display: inline-block;
  padding: 0.3rem 0.65rem;
  border-radius: 8px;
  font-size: 0.82rem;
  font-weight: 500;
  border: 1px solid var(--line);
  color: var(--accent-link);
  background: var(--surface);
  text-decoration: none;
  transition: background 0.15s, border-color 0.15s;
}

.proj-link:hover {
  background: var(--accent-soft);
  border-color: #c4d0e8;
  text-decoration: none;
}

.proj-link-paper {
  border-color: #c4d0e8;
  background: var(--accent-soft);
}

.proj-empty {
  grid-column: 1 / -1;
  text-align: center;
  padding: 2.5rem 1rem;
  color: var(--muted);
  font-size: 0.95rem;
}

/* ── Travel page ─────────────────────────────────────── */

/* Filter bar reuses .proj-filter-bar / .proj-filter-btn — no new rules needed */

.travel-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
}

/* Alternating zigzag: photos 1, 4, 7, 10… span 2 cols
   Row A: [wide ──────────][small]
   Row B: [small][wide ──────────]
   Rows always sum to 3 cols; pattern continues cleanly as photos are added */
.travel-photo:nth-child(3n+1) {
  grid-column: span 2;
  aspect-ratio: 3 / 2;
}

.travel-photo {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  border-radius: var(--radius-sm);
  cursor: pointer;
  background: var(--line);
}

.travel-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.3s ease;
}

.travel-photo:hover img {
  transform: scale(1.03);
}

.travel-caption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 0.55rem 0.75rem 0.5rem;
  background: linear-gradient(transparent, rgba(10, 12, 24, 0.62));
  color: rgba(255, 255, 255, 0.92);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  opacity: 0;
  transition: opacity 0.2s;
}

.travel-photo:hover .travel-caption {
  opacity: 1;
}

.travel-empty {
  grid-column: 1 / -1;
  text-align: center;
  padding: 3rem 1rem;
  color: var(--muted);
  font-size: 0.95rem;
}

/* Lightbox */
.lightbox {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 500;
  background: rgba(8, 10, 20, 0.93);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 0.75rem;
  cursor: pointer;
}

.lightbox.open {
  display: flex;
}

.lightbox img {
  max-width: 90vw;
  max-height: 82vh;
  object-fit: contain;
  border-radius: 6px;
  cursor: default;
}

.lightbox-caption {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.88rem;
  letter-spacing: 0.04em;
  text-align: center;
}

.lightbox-close {
  position: absolute;
  top: 1.25rem;
  right: 1.5rem;
  color: rgba(255, 255, 255, 0.55);
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  background: none;
  border: none;
  font-family: inherit;
  padding: 0.25rem 0.5rem;
}

.lightbox-close:hover {
  color: rgba(255, 255, 255, 0.9);
}

/* Responsive */
@media (max-width: 900px) {
  .grid-2 {
    grid-template-columns: 1fr;
  }

  .cards-3 {
    grid-template-columns: 1fr;
  }

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

  .travel-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  /* wide photos still span 2 on 2-col grid — fills the row cleanly */

  .nav-wrap {
    align-items: flex-start;
    padding-top: 0.5rem;
    padding-bottom: 0.5rem;
    flex-direction: column;
  }

  .hero {
    padding-top: 2.2rem;
  }
}

@media (max-width: 540px) {
  .travel-grid {
    grid-template-columns: 1fr;
  }

  /* On 1-col, nth-child span 2 becomes meaningless — reset it */
  .travel-photo:nth-child(3n+1) {
    grid-column: span 1;
    aspect-ratio: 4 / 3;
  }
}