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

:root {
  --color-bg: #ffffff;
  --color-text: #222222;
  --color-text-light: #555555;
  --color-accent: #1a6896;
  --color-accent-hover: #0f4a6e;
  --color-border: #e5e5e5;
  --color-bg-subtle: #f8f9fa;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-serif: Georgia, "Times New Roman", serif;
  --max-width: 860px;
  --sidebar-width: 220px;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

a:hover {
  color: var(--color-accent-hover);
  text-decoration: underline;
}

/* ==========================================
   Site Header / Nav
   ========================================== */
.site-header {
  border-bottom: 1px solid var(--color-border);
  padding: 0 2rem;
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(8px);
  z-index: 100;
}

.site-header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.site-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

.site-title:hover {
  text-decoration: none;
  color: var(--color-accent);
}

.site-nav {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.site-nav a {
  font-size: 0.9rem;
  color: var(--color-text-light);
  font-weight: 500;
  transition: color 0.15s;
}

.site-nav a:hover {
  color: var(--color-accent);
  text-decoration: none;
}

/* ==========================================
   Main Layout
   ========================================== */
.page-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 3rem 2rem 5rem;
}

/* ==========================================
   Profile Section
   ========================================== */
.profile-section {
  display: flex;
  gap: 3rem;
  align-items: flex-start;
  margin-bottom: 3.5rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid var(--color-border);
}

.profile-photo-wrap {
  flex-shrink: 0;
}

.profile-photo {
  width: var(--sidebar-width);
  height: auto;
  border-radius: 6px;
  display: block;
  border: 1px solid var(--color-border);
}

.profile-photo-placeholder {
  width: var(--sidebar-width);
  height: var(--sidebar-width);
  border-radius: 6px;
  background: linear-gradient(135deg, #dde8f0 0%, #c8daea 100%);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #7a9eb5;
  font-size: 4rem;
  user-select: none;
}

.profile-info {
  flex: 1;
}

.profile-name {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 0.25rem;
}

.profile-title {
  font-size: 1rem;
  color: var(--color-text-light);
  margin-bottom: 1.25rem;
}

.profile-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.75rem;
}

.profile-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--color-accent);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 0.3rem 0.7rem;
  transition: background 0.15s, border-color 0.15s;
}

.profile-link:hover {
  background: var(--color-bg-subtle);
  border-color: var(--color-accent);
  text-decoration: none;
}

.profile-link svg {
  width: 15px;
  height: 15px;
  fill: currentColor;
}

/* ==========================================
   About Section
   ========================================== */
.section {
  margin-bottom: 3.5rem;
}

.section-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 1.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-accent);
  display: inline-block;
}

.bio p {
  margin-bottom: 1rem;
  font-size: 0.97rem;
  color: var(--color-text);
}

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

/* ==========================================
   Experience
   ========================================== */
.exp-list {
  list-style: none;
}

.exp-item {
  display: grid;
  grid-template-columns: 1fr 1.6fr;
  gap: 1.5rem;
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--color-border);
  align-items: start;
}

.exp-item:first-child {
  border-top: 1px solid var(--color-border);
}

.exp-left {}

.exp-org {
  font-size: 0.97rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.15rem;
}

.exp-sub {
  font-size: 0.85rem;
  color: var(--color-text-light);
}

.exp-right {}

.exp-role {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text-light);
  margin-bottom: 0.2rem;
}

.exp-desc {
  font-size: 0.92rem;
  color: var(--color-text);
}

/* ==========================================
   Publications
   ========================================== */
.pub-list {
  list-style: none;
}

.pub-item {
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  gap: 1rem;
}

.pub-item:first-child {
  border-top: 1px solid var(--color-border);
}

.pub-number {
  font-size: 0.82rem;
  color: var(--color-text-light);
  min-width: 24px;
  padding-top: 0.15rem;
  text-align: right;
  flex-shrink: 0;
}

.pub-content {
  flex: 1;
}

.pub-title {
  font-size: 0.97rem;
  font-weight: 600;
  line-height: 1.5;
  margin-bottom: 0.25rem;
}

.pub-title a {
  color: var(--color-text);
}

.pub-title a:hover {
  color: var(--color-accent);
}

.pub-authors {
  font-size: 0.88rem;
  color: var(--color-text-light);
  margin-bottom: 0.2rem;
}

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

.pub-venue {
  font-size: 0.88rem;
  color: var(--color-text-light);
  font-style: italic;
}

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

.venue-conf {
  font-style: normal;
  font-weight: 600;
  color: var(--color-text-light);
}

.pub-note {
  font-size: 0.83rem;
  color: var(--color-text-light);
  margin-bottom: 1rem;
}

.eq {
  font-size: 1.1em;
  font-weight: 700;
  position: relative;
  top: -0.3em;
  margin-left: 0.05em;
}

/* ==========================================
   Footer
   ========================================== */
.site-footer {
  text-align: center;
  padding: 2rem;
  font-size: 0.82rem;
  color: #aaaaaa;
  border-top: 1px solid var(--color-border);
}

/* ==========================================
   Responsive
   ========================================== */
@media (max-width: 640px) {
  .exp-item {
    grid-template-columns: 1fr;
    gap: 0.4rem;
  }

  .profile-section {
    flex-direction: column;
    gap: 1.5rem;
  }

  .profile-photo {
    width: 140px;
  }

  .profile-photo-placeholder {
    width: 140px;
    height: 140px;
    font-size: 3rem;
  }

  .profile-name {
    font-size: 1.6rem;
  }

  .site-nav {
    gap: 1.25rem;
  }
}