:root {
  --bg: #f7f7fb;
  --bg-alt: #ffffff;
  --text: #1f2933;
  --text-muted: #6b7280;
  --accent: #2563eb;
  --accent-soft: rgba(37, 99, 235, 0.1);
  --border: #e5e7eb;
  --shadow-soft: 0 10px 30px rgba(15, 23, 42, 0.12);
  --radius-lg: 18px;
  --radius-xl: 24px;
  --max-width: 960px;
}

[data-theme="dark"] {
  --bg: #1f2738;
  --bg-alt: #0b1220;
  --text: #e5e7eb;
  --text-muted: #9ca3af;
  --accent: #60a5fa;
  --accent-soft: rgba(96, 165, 250, 0.2);
  --border: #1f2937;
  --shadow-soft: 0 14px 40px rgba(0, 0, 0, 0.65);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body {
  height: 100%;
}

body {
  font-family: "Outfit", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background-color: var(--bg);
  background-image: radial-gradient(circle at top left, #dbeafe 0, var(--bg) 36%, var(--bg) 100%);
  background-size: 140% 140%;
  background-repeat: no-repeat;
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

[data-theme="dark"] body {
  background-color: var(--bg);
  background-image: radial-gradient(circle at top left, #2f3d55 0, var(--bg) 36%, var(--bg) 100%);
  background-size: 140% 140%;
  background-repeat: no-repeat;
}

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

a:hover {
  text-decoration: underline;
}

/* Layout */
.page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(16px);
  background: linear-gradient(
    to bottom,
    color-mix(in srgb, var(--bg) 85%, transparent),
    color-mix(in srgb, var(--bg) 96%, transparent)
  );
  border-bottom: 1px solid color-mix(in srgb, var(--border) 80%, transparent);
}

.nav {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 1.25rem;
  gap: 1.5rem;
}

.nav-left {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-width: 0;
}

.site-title {
  font-weight: 650;
  letter-spacing: 0.02em;
  font-size: 1.1rem;
  white-space: nowrap;
}

/* Logo styling */
.logo-link {
  display: flex;
  align-items: center;
  margin-right: 0.6rem;
}

.logo-img {
  height: 26px;      /* or whatever height your SVG looks best at */
  width: auto;
  display: block;
}

.site-tagline {
  font-size: 0.9rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.nav-links {
  display: flex;
  gap: 1rem;
  align-items: center;
  font-size: 1.25rem;
}

.nav-links a {
  color: var(--text-muted);
  padding: 0.3rem 0.1rem;
  border-bottom: 2px solid transparent;
  text-decoration: none;
}

.nav-links a:hover {
  color: var(--text);
  border-bottom-color: var(--accent-soft);
}

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

/* Theme toggle button */
#theme-toggle {
  border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--border) 70%, transparent);
  background: color-mix(in srgb, var(--bg-alt) 90%, transparent);
  padding: 0.35rem 0.75rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  cursor: pointer;
  box-shadow: 0 3px 10px rgba(15, 23, 42, 0.06);
  transition:
    background 0.2s ease,
    border-color 0.2s ease,
    box-shadow 0.2s ease,
    transform 0.08s ease;
}

#theme-toggle:hover {
  background: color-mix(in srgb, var(--bg-alt) 100%, transparent);
  border-color: var(--accent-soft);
  box-shadow: 0 6px 16px rgba(15, 23, 42, 0.1);
}

#theme-toggle:active {
  transform: translateY(1px) scale(0.99);
  box-shadow: 0 2px 8px rgba(15, 23, 42, 0.06);
}

#theme-toggle span.icon {
  font-size: 1.05rem;
}

main {
  flex: 1;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2.5rem 1.25rem 3rem;
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

/* Hero */
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 2.75fr) ;
  gap: 1rem;
  align-items: center;
}

.hero-card,
.profile-card {
  background: transparent;
  border: none;
  box-shadow: none;
  padding: 0;
}

/* Keep inner content spacing nicely */
.hero-inner {
  padding-right: 2rem;       /* optional; gives some space before the profile column */
}

.hero-name {
  font-size: 1.8rem;
  font-weight: 750;
  letter-spacing: 0.03em;
  margin-bottom: 0.25rem;
}

.hero-title {
  font-size: 1rem;
  color: var(--text-muted);
  margin-bottom: 0.9rem;
}

.hero-summary {
  font-size: 0.98rem;
  color: var(--text);
  margin-bottom: 1.0rem;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.4rem;
}

.hero-tag {
  font-size: 0.8rem;
  border-radius: 999px;
  /* border: 1px solid color-mix(in srgb, var(--accent-soft) 80%, transparent);
  */
  background: color-mix(in srgb, var(--bg-alt) 90%, transparent); 
  color: var(--text-muted);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.7rem;
  align-items: center;
}

.btn-primary,
.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 500;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
  transition:
    background 0.18s ease,
    color 0.18s ease,
    border-color 0.18s ease,
    box-shadow 0.18s ease,
    transform 0.08s ease;
}

.btn-primary {
  background: var(--accent);
  color: #ffffff;
  box-shadow: 0 10px 24px rgba(37, 99, 235, 0.35);
}

.btn-primary:hover {
  background: color-mix(in srgb, var(--accent) 90%, #ffffff 10%);
  text-decoration: none;
  box-shadow: 0 14px 30px rgba(37, 99, 235, 0.45);
  transform: translateY(-1px);
}

.btn-primary:active {
  transform: translateY(1px) scale(0.99);
  box-shadow: 0 6px 16px rgba(37, 99, 235, 0.32);
}

.btn-ghost {
  background: transparent;
  border-color: color-mix(in srgb, var(--border) 75%, transparent);
  color: var(--text-muted);
}

.btn-ghost:hover {
  background: color-mix(in srgb, var(--bg-alt) 90%, transparent);
  border-color: var(--accent-soft);
  text-decoration: none;
}

/* Portrait / side card */
.hero-aside {
  display: flex;
  justify-content: center;
}

.profile-photo {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  overflow: hidden;    
  margin: 0 auto 0.85rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.profile-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;   /* makes sure your face is centered nicely */
  display: block;
}

[data-theme="dark"] .profile-photo {
  background: linear-gradient(135deg, #1f2937, #111827);
}

.profile-name {
  font-weight: 600;
  font-size: 1.5rem;
  margin-bottom: 0.15rem;
}

.profile-role {
  font-size: 1.0rem;
  color: var(--text-muted);
  margin-bottom: 0.7rem;
}

.profile-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.35rem;
}

.profile-links a {
  font-size: 0.8rem;
  font-weight: 500;
  padding: 0.12rem 0.45rem;
  border-radius: 999px;
  background: color-mix(in srgb, var(--bg) 96%, transparent);
  border: 1px solid color-mix(in srgb, var(--border) 80%, transparent);
  color: var(--text-muted);
  text-decoration: none;
}

.profile-links a:hover {
  border-color: var(--accent-soft);
  color: var(--accent);
}

/* Section blocks */
section {
  background: color-mix(in srgb, var(--bg-alt) 98%, transparent);
  border-radius: var(--radius-lg);
  border: 1px solid color-mix(in srgb, var(--border) 88%, transparent);
  padding: 1.6rem 1.5rem 1.5rem;
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.08);
}

section + section {
  margin-top: 0.75rem;
}

.section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

.section-title {
  font-size: 1.8rem;
  font-weight: 600;
}

.section-subtitle {
  font-size: 1.2rem;
  color: var(--text-muted);
}

.section-body p + p {
  margin-top: 0.7rem;
}

.section-note {
  margin-top: 0.0rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.section-note a {
  color: var(--accent);
  text-decoration: none;
}

.section-note a:hover {
  text-decoration: underline;
}

.item {
  display: grid;
  font-size: 0.95rem;
  /* padding: 0.75rem 1rem 0.75rem 1.25rem; */
  /* padding: 0 0 1.8rem 0; */
  padding: 0 0 0 0; 
}

.item-title {
  font-weight: 500;
  margin-bottom: 0.15rem;
}

.item-meta {
  font-size: 0.85rem;
  margin-bottom: 0.15rem;
}

.item-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.55rem;
}

/* Timeline layout -- for experience */
.timeline {
  position: relative;
  margin-top: 0.5rem;
  padding-left: 4.1rem;   /* space for line + bullets */
  display: flex;
  flex-direction: column;
  gap: 1.3rem;
  --timeline-axis: 0.7rem;      /* horizontal position of the timeline axis */
}

/* Each entry */
.timeline-item {
  position: relative;
  /* padding-left: 0.4rem; */
  padding: 0.75rem 1rem 0.75rem 1.25rem;
  background: linear-gradient(-135deg,
    color-mix(in srgb, var(--bg-alt) 96%, transparent),
    color-mix(in srgb, var(--accent-soft) 90%, var(--bg-alt) 10%)
  );
  box-shadow: var(--shadow-soft);
  border-radius: 0.9rem;
  border: 2px solid color-mix(in srgb, var(--border) 80%, transparent);
}

/* Current status */
.timeline-item-current {
  border-color: color-mix(in srgb, var(--accent) 50%, var(--border) 50%);
  background: linear-gradient(-135deg,
    color-mix(in srgb, var(--bg-alt) 96%, transparent),
    color-mix(in srgb, var(--accent-soft) 90%, var(--bg-alt) 10%)
  );
}

/* Circle bullets (○ / ● effect) */
.timeline-item::before {
  content: "";
  position: absolute;
  /* bullet size */
  width: 16px;
  height: 16px;
  border-radius: 50%;
  
  /* location */
  left: calc(var(--timeline-axis) - 3.85rem - 9px);

  top: 50%;
  transform: translateY(-50%);

  border: 2px solid color-mix(in srgb, var(--accent) 85%, var(--border) 15%);
  background: var(--bg);   
}

/* Current role: filled circle */
.timeline-item-current::before {
  background: color-mix(in srgb, var(--accent) 85%, var(--border) 15%);
}

/* Connector line segment BELOW each bullet */
.timeline-item::after {
  content: "";
  position: absolute;

  /* this should sit under the center of the bullet */
  left: calc(var(--timeline-axis) - 3.85rem );

  top: calc(50% + 1.2rem);        /* start from bullet center */
  width: 1px;
  height: calc(100% - 1.0rem);  /* through this item + gap to next */
  background: color-mix(in srgb, var(--accent) 85%, var(--border) 15%);
  /* background: color-mix(in srgb, var(--border) 85%, transparent); */
}

/* No connector after the last item */
.timeline-item:last-child::after {
  display: none;
}

/* Text styling */
.timeline-meta {
  display: grid;
  grid-template-columns: minmax(0, 0.5fr) minmax(0, 4.0fr); /* or tweak ratio */
  column-gap: 0.75rem;
  align-items: center;
  margin-bottom: 0.15rem;
}

/* Logo cell: keep logo compact */
.timeline-logo-cell {
  display: flex;
  align-items: center;
  justify-content: flex-start;
}

.timeline-logo {
  width: auto;     /* adjust as needed */
  height: 64px;
  display: block;
  flex-shrink: 0;
  border-radius: 0.25rem;  /* optional: soften edges */
}

/* Text cell: normal timeline text styling */
.timeline-text-cell {
  min-width: 0;    /* allows text to wrap nicely in grid layouts */
}

.timeline-role {
  font-weight: 550;
  font-size: 0.98rem;
}

.timeline-place {
  font-size: 0.98rem;
  font-weight: 300;
}

.timeline-date {
  font-size: 0.98rem;
  font-weight: 300;
}

.timeline-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-top: 0.15rem;
}

/* Optional: tighter on small screens */
@media (max-width: 600px) {
  .timeline {
    padding-left: 1.4rem;
    gap: 1.0rem;
  }

  .timeline-role {
    font-size: 0.95rem;
  }
}

/* Two-column layout for paper entry, description + illustration */
.two-column {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 2.1rem 0.7rem;
  margin-top: 0.6rem;
}

@media (max-width: 768px) {
  .two-column {
    grid-template-columns: 1fr;
  }
}

/* One paper entry */
.paper-entry {
  padding: 0 0 1.8rem 0;     /* extra breathing room inside */
  margin-top: 1.2rem;
  margin-bottom: 1.8rem;     /* space between entries */
  border-bottom: 1px solid color-mix(in srgb, var(--border) 65%, transparent);
}

/* Remove the border after the last entry */
.paper-entry:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

/* LEFT column: text */
.paper-main {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

/* Meta / title / description reuse your item styles */
.paper-main .item-meta {
  font-size: 0.85rem;
}

.paper-main .item-title {
  font-weight: 550;
  font-size: 1.0rem;
}

.paper-main .item-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* Links under each paper */
.paper-links {
  display: flex;
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.9rem;
}

/* Definition shared with project-links */
/* .paper-links a, 
.paper-links button {
  padding: 0.25rem 0.7rem;
  border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--accent) 50%, var(--border) 50%); 
  text-decoration: none;
  color: var(--accent);
}

.paper-links a:hover,
.paper-links button:hover {
  color: var(--accent);
  background-color: var(--accent-soft);
} */

.paper-screenshot {
  border-radius: 0.9rem;
  overflow: hidden;
  align-self: center;
  border: 1px solid color-mix(in srgb, var(--border) 80%, transparent);
  background: color-mix(in srgb, var(--bg-alt) 92%, transparent);
  padding: 0.4rem;
  box-shadow: 0 8px 22px rgba(0, 0, 0, 0.15);
}

.paper-screenshot img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 0.5rem;
}

/* Projects */
.project-row {
  display: grid;
  grid-template-columns: minmax(0, 4.0fr) minmax(0, 0.5fr); /* or tweak ratio */
  column-gap: 0.55rem;
  align-items: flex-start;
  /* margin-bottom: 0.15rem; */
  padding: 0 0 1.8rem 0;     /* extra breathing room inside */
  margin-top: 1.2rem;
  margin-bottom: 1.8rem;
  border-bottom: 1px solid color-mix(in srgb, var(--border) 65%, transparent);
}

/* Remove the border after the last entry */
.project-row:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

/* Logo */
.project-row-logo {
  height: auto;
  width: 100%;
  margin-top: 1rem;
  object-fit: contain;
}

.project-item {
  display: grid;
  font-size: 0.95rem;
  padding: 0 0 0 0; 
  grid-column: 1/2;
}

.project-row:not(:has(.project-row-logo)) .project-item {
  grid-column: 1 / -1;
}

.project-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.9rem;
}

.paper-links a, .project-links a, 
.paper-links button {
  padding: 0.25rem 0.7rem;
  border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--accent) 50%, var(--border) 50%); 
  text-decoration: none;
  color: var(--accent);
}

.paper-links a:hover, .project-links button:hover,
.paper-links a:hover {
  color: var(--accent);
  background-color: var(--accent-soft);
}

/* Contact */
.contact-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1.5rem;
  font-size: 0.95rem;
}

.contact-item-label {
  font-weight: 500;
  margin-right: 0.25rem;
}

footer {
  max-width: var(--max-width);
  margin: 0 auto 1.5rem;
  padding: 0 1.25rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

/* Responsive tweaks */
@media (max-width: 768px) {
  .nav {
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 0.5rem 1rem;
  }

  .site-tagline {
    display: none;
  }

  .nav-links {
    display: none;
  }

  .hero {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero-aside {
    order: -1;
  }

  main {
    padding-top: 1.8rem;
  }
}

@media (max-width: 480px) {
  .hero-card {
    padding: 1.4rem 1.25rem 1.3rem;
  }
}

/* In light mode: use the original dark logo (no filter) */
html[data-theme="light"] .img-dark {
  filter: invert(1);
}

/* In dark mode: invert it so it becomes light on dark background */
html[data-theme="dark"] .img-dark {
  filter: none;
}

html[data-theme="light"] .logo-auto {
  filter: none;
}

/* Dark mode: invert and slightly tweak brightness/contrast */
html[data-theme="dark"] .logo-auto {
  filter: invert(1) brightness(1.05) contrast(1.05);
}

/* === Citation modal === */

.citation-modal {
  position: fixed;
  inset: 0;
  display: none;                 /* hidden by default */
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.citation-modal.is-open {
  display: flex;                 /* show when active */
}

.citation-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.55);
}

.citation-dialog {
  position: relative;
  max-width: 640px;
  width: 90%;
  max-height: 70vh;
  background: var(--bg-alt);
  border-radius: 0.9rem;
  border: 1px solid color-mix(in srgb, var(--border) 80%, transparent);
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.45);
  padding: 1rem 1.1rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  overflow: hidden;
}

.citation-close {
  position: absolute;
  top: 0.5rem;
  right: 0.7rem;
  border: none;
  background: transparent;
  font-size: 1.2rem;
  cursor: pointer;
  color: var(--text-muted);
}

.citation-close:hover {
  color: var(--accent);
}

.citation-btn {
  margin-right: auto;
}

#citation-title {
  font-size: 0.98rem;
  margin: 0 2rem 0.2rem 0;
}

#citation-content {
  margin: 0;
  padding: 0.9rem 1rem;
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--text-muted);

  white-space: pre-wrap;     /* wrap long lines */
  overflow: auto;

  /* ▼ Rounded highlight box */
  border-radius: 0.9rem;
  border: 2px solid color-mix(in srgb, var(--border) 80%, transparent);
  background: color-mix(in srgb, var(--accent-soft) 90%, var(--bg-alt) 10%);
  box-shadow: var(--shadow-soft);
}