/* =====================================================
   DESIGN SYSTEM — Dark & Bold | Dianzhao Li
   ===================================================== */

/* ── Dark-mode CSS variable overrides ── */
body.dark-mode {
  --background-color:       #0d1117;
  --background-color-light: #161b22;
  --text-color:             #e6edf3;
  --primary-color:          #58a6ff;
  --secondary-color:        #388bfd;
  --border-color:           #30363d;
  --link-color:             #58a6ff;
  --link-hover-color:       #79c0ff;
  --header-background:      rgba(13,17,23,0.92);
  --card-shadow:            0 4px 24px rgba(0,0,0,.55);
}

/* ── Light-mode CSS variable overrides ── */
body.light-mode {
  --background-color:       #f6f8fa;
  --background-color-light: #ffffff;
  --text-color:             #1c2128;
  --primary-color:          #0969da;
  --secondary-color:        #0550ae;
  --border-color:           #d0d7de;
  --link-color:             #0969da;
  --link-hover-color:       #0550ae;
  --header-background:      rgba(255,255,255,0.92);
  --card-shadow:            0 2px 12px rgba(0,0,0,.08);
}

body {
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* =====================================================
   NAVBAR
   ===================================================== */
.navbar {
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
}

/* =====================================================
   PROFILE CARD
   ===================================================== */
.profile-card {
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 28px 20px;
  background: var(--background-color-light);
  box-shadow: var(--card-shadow);
  transition: box-shadow 0.3s ease;
  position: sticky;
  top: calc(var(--navbar-height) + 24px);
}

.rounded-avatar {
  border: 3px solid var(--primary-color) !important;
  box-shadow: 0 0 0 6px rgba(88,166,255,0.15), 0 0 32px rgba(88,166,255,0.18) !important;
  transition: box-shadow 0.3s ease !important;
}

.rounded-avatar:hover {
  box-shadow: 0 0 0 6px rgba(88,166,255,0.3), 0 0 40px rgba(88,166,255,0.35) !important;
}

.social-icon {
  transition: transform 0.2s ease, color 0.2s ease !important;
}

.social-icon:hover {
  transform: translateY(-3px) !important;
  color: var(--primary-color) !important;
}

/* ── Sidebar: description/quote styled under photo ── */
.profile-card .profile-description p {
  font-size: 0.83rem;
  font-weight: 600;
  color: var(--primary-color);
  margin: 0 0 4px;
  text-align: center;
  line-height: 1.4;
}
.profile-card .profile-quote p {
  font-size: 0.77rem;
  color: var(--text-muted, #8b949e);
  margin: 0;
  text-align: center;
  font-style: italic;
  line-height: 1.4;
}
.profile-card .social-links {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border-color);
}

/* ── Light-mode: override hardcoded dark-blue rgba values ── */
body.light-mode .rounded-avatar {
  box-shadow: 0 0 0 5px rgba(9,105,218,0.1), 0 2px 10px rgba(9,105,218,0.12) !important;
}
body.light-mode .rounded-avatar:hover {
  box-shadow: 0 0 0 6px rgba(9,105,218,0.22), 0 2px 16px rgba(9,105,218,0.2) !important;
}
body.light-mode .btn-primary:hover {
  box-shadow: 0 4px 14px rgba(9,105,218,0.25);
}
body.light-mode .btn-outline:hover {
  background: rgba(9,105,218,0.07);
}
body.light-mode .pub-entry:hover {
  box-shadow: 0 6px 24px rgba(9,105,218,0.1) !important;
}
body.light-mode .pub-links a:hover {
  background: rgba(9,105,218,0.07) !important;
}
body.light-mode .skill-category:hover {
  box-shadow: 0 4px 16px rgba(9,105,218,0.08);
}
body.light-mode .exp-card:hover {
  box-shadow: 0 4px 20px rgba(9,105,218,0.1);
}
body.light-mode .edu-card:hover {
  box-shadow: 0 4px 20px rgba(9,105,218,0.1);
}

/* =====================================================
   SECTION HEADINGS
   ===================================================== */
.main-content h1 {
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.3px;
  padding-bottom: 10px;
  margin-top: 36px;
  margin-bottom: 20px;
  position: relative;
}

.main-content h1::after {
  content: '';
  display: block;
  position: absolute;
  bottom: 0;
  left: 0;
  width: 44px;
  height: 3px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--primary-color), transparent);
}

/* =====================================================
   HERO SECTION
   ===================================================== */
.hero-section {
  padding: 6px 0 26px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 30px;
}

.hero-tagline {
  font-size: 0.94rem;
  font-weight: 600;
  color: var(--primary-color);
  letter-spacing: 0.2px;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.hero-tagline .sep {
  color: var(--border-color);
  font-weight: 300;
}

.open-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(35,134,54,0.12);
  border: 1px solid rgba(35,134,54,0.35);
  color: #3fb950;
  font-size: 0.77rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 20px;
  letter-spacing: 0.2px;
  margin-bottom: 12px;
  width: fit-content;
}

.open-badge .dot {
  width: 7px;
  height: 7px;
  background: #3fb950;
  border-radius: 50%;
  animation: pulse-dot 2s infinite;
  flex-shrink: 0;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.5; transform: scale(1.35); }
}

.hero-cta {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 16px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--primary-color);
  color: #fff !important;
  padding: 8px 18px;
  border-radius: 7px;
  font-size: 0.86rem;
  font-weight: 600;
  text-decoration: none !important;
  transition: background 0.2s, transform 0.2s, box-shadow 0.2s;
}

.btn-primary:hover {
  background: var(--secondary-color);
  transform: translateY(-2px);
  box-shadow: 0 4px 14px rgba(88,166,255,0.35);
  text-decoration: none !important;
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: transparent;
  color: var(--primary-color) !important;
  padding: 7px 17px;
  border-radius: 7px;
  font-size: 0.86rem;
  font-weight: 600;
  text-decoration: none !important;
  border: 1.5px solid var(--primary-color);
  transition: background 0.2s, transform 0.2s;
}

.btn-outline:hover {
  background: rgba(88,166,255,0.1);
  transform: translateY(-2px);
  text-decoration: none !important;
}

/* =====================================================
   PUBLICATION CARDS
   ===================================================== */
.pub-entry {
  display: flex !important;
  flex-direction: row !important;
  gap: 18px !important;
  margin-bottom: 16px !important;
  align-items: flex-start !important;
  background: var(--background-color-light) !important;
  border: 1px solid var(--border-color) !important;
  border-left: 4px solid var(--primary-color) !important;
  border-radius: 10px !important;
  padding: 16px !important;
  transition: transform 0.2s ease, box-shadow 0.2s ease !important;
  border-bottom: 1px solid var(--border-color) !important;
}

.pub-entry:hover {
  transform: translateY(-3px) !important;
  box-shadow: 0 6px 24px rgba(88,166,255,0.14) !important;
}

.pub-entry.right {
  flex-direction: row-reverse !important;
}

.pub-entry img {
  max-width: 200px !important;
  width: 200px !important;
  height: auto !important;
  border: 1px solid var(--border-color) !important;
  border-radius: 7px !important;
  padding: 3px !important;
  background: var(--background-color) !important;
  box-shadow: none !important;
  flex-shrink: 0 !important;
  object-fit: cover !important;
}

.pub-text {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.pub-venue {
  font-size: 0.83rem;
  color: var(--text-muted, #8b949e);
}

.pub-links {
  display: flex !important;
  flex-wrap: wrap !important;
  gap: 7px !important;
  margin-top: 8px !important;
  align-items: center !important;
}

.pub-links a {
  display: inline-flex !important;
  align-items: center !important;
  gap: 5px !important;
  color: var(--primary-color) !important;
  font-size: 0.82rem !important;
  font-weight: 600 !important;
  text-decoration: none !important;
  padding: 3px 10px !important;
  border-radius: 6px !important;
  border: 1px solid var(--primary-color) !important;
  margin: 0 !important;
  transition: background 0.2s, transform 0.2s !important;
}

.pub-links a:hover {
  background: rgba(88,166,255,0.1) !important;
  transform: translateY(-1px) !important;
  text-decoration: none !important;
}

/* suppress <br> inside flex-column pub-text — gap handles spacing */
.pub-text br {
  display: none;
}

/* footnote line below pub links */
.pub-note {
  font-size: 0.78rem;
  color: var(--text-muted, #8b949e);
  font-style: italic;
  margin-top: 2px;
}

/* Venue badge */
.venue-badge {
  display: inline-block;
  font-size: 0.74rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 4px;
  letter-spacing: 0.15px;
  margin-right: 5px;
}

.venue-badge.ieee       { background: rgba(0,98,204,0.13);  color: #388bfd; border: 1px solid rgba(0,98,204,0.28); }
.venue-badge.nature     { background: rgba(255,136,0,0.12); color: #f0883e; border: 1px solid rgba(255,136,0,0.28); }
.venue-badge.arxiv      { background: rgba(185,28,28,0.12); color: #ff6b6b; border: 1px solid rgba(185,28,28,0.28); }
.venue-badge.conference { background: rgba(88,166,255,0.12); color: var(--primary-color); border: 1px solid rgba(88,166,255,0.28); }

/* Status badge */
.status-badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 12px;
  letter-spacing: 0.15px;
}

.status-badge.published { background: rgba(35,134,54,0.13);  color: #3fb950; border: 1px solid rgba(35,134,54,0.28); }
.status-badge.review    { background: rgba(210,153,34,0.13); color: #d29922; border: 1px solid rgba(210,153,34,0.28); }

@media (max-width: 650px) {
  .pub-entry, .pub-entry.right { flex-direction: column !important; }
  .pub-entry img { max-width: 100% !important; width: 100% !important; }
}

/* =====================================================
   SKILLS SECTION
   ===================================================== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-top: 6px;
}

.skill-category {
  background: var(--background-color-light);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 15px 16px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.skill-category:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(88,166,255,0.1);
}

.skill-category-label {
  font-size: 0.73rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.7px;
  margin-bottom: 10px;
  padding-bottom: 7px;
  border-bottom: 1px solid var(--border-color);
}

.skill-category.lang  .skill-category-label { color: #f0883e; border-bottom-color: rgba(240,136,62,0.3); }
.skill-category.ml    .skill-category-label { color: #bc8cff; border-bottom-color: rgba(188,140,255,0.3); }
.skill-category.sim   .skill-category-label { color: #39d353; border-bottom-color: rgba(57,211,83,0.3); }
.skill-category.tools .skill-category-label { color: #58a6ff; border-bottom-color: rgba(88,166,255,0.3); }

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.skill-tag {
  display: inline-block;
  font-size: 0.77rem;
  font-weight: 500;
  padding: 3px 9px;
  border-radius: 5px;
  transition: transform 0.15s ease;
  cursor: default;
}

.skill-tag:hover { transform: translateY(-1px); }

.skill-category.lang  .skill-tag { background: rgba(240,136,62,0.12); color: #f0883e; border: 1px solid rgba(240,136,62,0.22); }
.skill-category.ml    .skill-tag { background: rgba(188,140,255,0.12); color: #bc8cff; border: 1px solid rgba(188,140,255,0.22); }
.skill-category.sim   .skill-tag { background: rgba(57,211,83,0.1);   color: #39d353; border: 1px solid rgba(57,211,83,0.22); }
.skill-category.tools .skill-tag { background: rgba(88,166,255,0.12); color: #58a6ff; border: 1px solid rgba(88,166,255,0.22); }

/* =====================================================
   VISITOR INSIGHTS
   ===================================================== */
.visitor-insights {
  margin-top: 32px;
  text-align: left;
}

.visitor-counter {
  display: block;
  max-width: 100%;
  margin: 0;
}

/* =====================================================
   EXPERIENCE CARDS
   ===================================================== */
.exp-card {
  background: var(--background-color-light);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--primary-color);
  border-radius: 10px;
  padding: 16px 18px;
  margin-bottom: 14px;
  display: flex;
  align-items: flex-start;
  gap: 20px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.exp-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(88,166,255,0.12);
}

.exp-logo-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 130px;
  gap: 6px;
  flex-shrink: 0;
}

.exp-logo-wrap img {
  height: 65px;
  width: 120px;
  object-fit: contain;
  display: block;
}

.exp-date {
  font-size: 0.76rem;
  color: var(--text-muted, #8b949e);
  text-align: center;
  font-style: italic;
  white-space: nowrap;
}

.exp-role {
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--text-color);
  margin-bottom: 2px;
}

.exp-org {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--primary-color);
  margin-bottom: 5px;
}

.exp-desc {
  font-size: 0.86rem;
  line-height: 1.6;
  color: var(--text-muted, #8b949e);
}

@media (max-width: 600px) {
  .exp-card { flex-direction: column; }
  .exp-logo-wrap { min-width: unset; flex-direction: row; align-items: center; gap: 12px; }
}

/* =====================================================
   EDUCATION CARDS
   ===================================================== */
.edu-card {
  background: var(--background-color-light);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--primary-color);
  border-radius: 10px;
  padding: 16px 18px;
  margin-bottom: 14px;
  display: flex;
  align-items: flex-start;
  gap: 20px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.edu-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(188,140,255,0.12);
}

.edu-logo-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 130px;
  gap: 6px;
  flex-shrink: 0;
}

.edu-logo-wrap img {
  height: 65px;
  width: 120px;
  object-fit: contain;
  display: block;
}

.edu-date {
  font-size: 0.76rem;
  color: var(--text-muted, #8b949e);
  text-align: center;
  font-style: italic;
  white-space: nowrap;
}

.edu-degree {
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--text-color);
  margin-bottom: 2px;
}

.edu-school {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--primary-color);
  margin-bottom: 5px;
}

.edu-meta {
  font-size: 0.86rem;
  line-height: 1.6;
  color: var(--text-muted, #8b949e);
}

@media (max-width: 600px) {
  .edu-card { flex-direction: column; }
  .edu-logo-wrap { min-width: unset; flex-direction: row; align-items: center; gap: 12px; }
}

/* =====================================================
   LANGUAGE SELECTOR — HIDE
   ===================================================== */
.language-selector,
.navbar-language-selector,
.language-switcher,
.navbar-right .dropdown,
.navbar-right .language-toggle {
  display: none !important;
}