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

:root {
  --bg: #ffffff;
  --text: #1d1d1f;
  --text-secondary: #6e6e73;
  --accent: #1d1d1f;
  --link: #0066cc;
  --link-hover: #004499;
  --border: #e8e8ed;
  --surface: #f5f5f7;
  --transition: 0.15s ease;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111111;
    --text: #f5f5f7;
    --text-secondary: #86868b;
    --accent: #f5f5f7;
    --link: #5eaaff;
    --link-hover: #8fc5ff;
    --border: #2d2d2d;
    --surface: #1c1c1e;
  }
}

/* ========== Base ========== */
html {
  scroll-behavior: smooth;
  scroll-padding-top: 72px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'Inter', 'Segoe UI', Roboto, sans-serif;
  font-size: 15px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 24px;
}

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

a:hover {
  color: var(--link-hover);
}

/* ========== Navbar ========== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.72);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 0.5px solid var(--border);
}

@media (prefers-color-scheme: dark) {
  .navbar {
    background: rgba(17,17,17,0.72);
  }
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 48px;
}

.nav-brand {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.01em;
}

.nav-brand:hover {
  color: var(--link);
}

.nav-links a {
  font-size: 0.82rem;
  font-weight: 400;
  color: var(--text-secondary);
  margin-left: 24px;
}

.nav-links a:hover {
  color: var(--text);
}

/* Hamburger (hidden on desktop) */
.nav-toggle { display: none; }

.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 4px;
  cursor: pointer;
  padding: 6px;
  z-index: 110;
}

.nav-hamburger span {
  display: block;
  width: 18px;
  height: 1.5px;
  background: var(--text);
  border-radius: 1px;
  transition: transform var(--transition), opacity var(--transition);
}

/* ========== Hero ========== */
.hero {
  padding: 64px 0 48px;
}

.profile {
  display: flex;
  align-items: flex-start;
  gap: 32px;
}

.profile-photo {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
}

.profile-info h1 {
  font-size: 1.8rem;
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.2;
  margin-bottom: 8px;
}

.tagline {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 12px;
}

.bio {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

.email {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.links {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 14px;
}

.links a {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 5px 12px;
  border: 1px solid var(--border);
  border-radius: 100px;
  transition: all var(--transition);
}

.links a:hover {
  color: var(--text);
  border-color: var(--text-secondary);
}

/* ========== Sections ========== */
.section {
  padding: 40px 0;
}

.section h2 {
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 20px;
  color: var(--text);
}

.section h3 {
  font-size: 0.78rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  margin-bottom: 10px;
  margin-top: 28px;
}

.section h3:first-of-type {
  margin-top: 0;
}

/* ========== Entries (Education, Experience, Teaching) ========== */
.entries {
  display: flex;
  flex-direction: column;
}

.entry {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding: 12px 0;
  border-top: 1px solid var(--border);
}

.entry:first-child {
  border-top: none;
  padding-top: 0;
}

.entry-main {
  display: flex;
  flex-direction: column;
  flex: 1;
}

.entry-title {
  font-weight: 500;
  font-size: 0.93rem;
  color: var(--text);
}

.entry-sub {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 1px;
}

.entry-sub a {
  color: inherit;
}

.entry-aside {
  flex-shrink: 0;
  font-size: 0.8rem;
  color: var(--text-secondary);
  text-align: right;
  line-height: 1.5;
}

.entries.compact .entry {
  padding: 8px 0;
}

.entries.compact .entry-title {
  font-size: 0.9rem;
}

/* ========== Publications ========== */
.pub-list {
  display: flex;
  flex-direction: column;
}

.pub {
  padding: 16px 0;
  border-top: 1px solid var(--border);
}

.pub:first-child {
  border-top: none;
  padding-top: 0;
}

.pub-title {
  font-weight: 500;
  font-size: 0.93rem;
  line-height: 1.45;
  margin-bottom: 4px;
}

.pub-authors {
  font-size: 0.84rem;
  color: var(--text-secondary);
  line-height: 1.55;
  margin-bottom: 3px;
}

.pub-authors strong {
  font-weight: 600;
  color: var(--text);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.pub-authors .co-first {
  font-style: italic;
  font-size: 0.8rem;
}

.pub-venue {
  font-size: 0.84rem;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

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

.pub-acceptance {
  display: inline-block;
  font-size: 0.73rem;
  font-weight: 500;
  color: var(--link);
  margin-bottom: 6px;
}

.pub-links {
  display: flex;
  gap: 6px;
}

.pub-links a {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.73rem;
  font-weight: 500;
  padding: 3px 9px;
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-secondary);
  transition: all var(--transition);
}

.pub-links a svg {
  flex-shrink: 0;
  vertical-align: middle;
}

.pub-links a:hover {
  color: var(--text);
  border-color: var(--text-secondary);
}

/* ========== Skills ========== */
.skills {
  display: flex;
  gap: 56px;
}

.skills p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ========== Footer ========== */
footer {
  padding: 40px 0 32px;
  text-align: center;
  font-size: 0.78rem;
  color: var(--text-secondary);
}

/* ========== Scroll fade-in ========== */
.section {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.section.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ========== Responsive — Tablet ========== */
@media (max-width: 768px) {
  .hero { padding: 48px 0 40px; }

  .profile { gap: 24px; }

  .profile-photo {
    width: 110px;
    height: 110px;
  }

  .profile-info h1 { font-size: 1.5rem; }

  .entry {
    flex-direction: column;
    gap: 2px;
  }

  .entry-aside {
    text-align: left;
    font-size: 0.78rem;
  }

  .skills {
    flex-direction: column;
    gap: 20px;
  }
}

/* ========== Responsive — Mobile ========== */
@media (max-width: 560px) {
  .profile {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .profile-photo {
    width: 100px;
    height: 100px;
  }

  .links { justify-content: center; }

  .profile-info h1 { font-size: 1.4rem; }

  .hero { padding: 36px 0 32px; }
  .section { padding: 32px 0; }

  /* Mobile hamburger */
  .nav-hamburger { display: flex; }

  .nav-links {
    position: fixed;
    top: 0;
    right: 0;
    width: 200px;
    height: 100vh;
    background: var(--bg);
    border-left: 0.5px solid var(--border);
    display: flex;
    flex-direction: column;
    padding: 64px 24px 24px;
    visibility: hidden;
    opacity: 0;
    transition: opacity 0.25s ease, visibility 0.25s ease;
    z-index: 105;
  }

  .nav-links a {
    margin-left: 0;
    margin-bottom: 20px;
    font-size: 0.9rem;
    display: block;
  }

  .nav-toggle:checked ~ .nav-links {
    visibility: visible;
    opacity: 1;
  }

  .nav-toggle:checked ~ .nav-hamburger span:nth-child(1) {
    transform: translateY(5.5px) rotate(45deg);
  }
  .nav-toggle:checked ~ .nav-hamburger span:nth-child(2) {
    opacity: 0;
  }
  .nav-toggle:checked ~ .nav-hamburger span:nth-child(3) {
    transform: translateY(-5.5px) rotate(-45deg);
  }
}