/* 1. Reset & Global Box Model FIRST */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --text-main: #222222;
  --text-muted: #666666;
  --text-light: #888888;
  --link-color: #0366d6;
  --border-color: #eeeeee;
  --bg-color: #ffffff;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

/* 2. Lock Scrollbar to prevent layout jump across all pages */
html {
  overflow-y: scroll;
  scrollbar-gutter: stable;
}

body {
  font-family: var(--font-sans);
  color: var(--text-main);
  background-color: var(--bg-color);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -webkit-text-size-adjust: 100%;
}

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

a:hover {
  text-decoration: underline;
}

/* --- Container Layout --- */
.layout {
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

/* --- Responsive Sidebar --- */
.side-nav {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 2rem;
}

.profile-header {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.profile-photo {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  background-color: #eee;
}

.profile-meta h1 {
  font-size: 1.4rem;
  font-weight: 700;
  line-height: 1.2;
}

.profile-meta p {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

/* Nav Links */
.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
}

.nav-links a {
  color: var(--text-muted);
  font-size: 0.95rem;
  padding: 0.25rem 0;
}

.nav-links a.active {
  color: var(--text-main);
  font-weight: 600;
}

/* Social Links */
.social-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  font-size: 0.85rem;
}

.social-links a {
  color: var(--text-muted);
  padding: 0.2rem 0;
}

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

/* --- Content Areas --- */
.content {
  flex: 1;
  min-width: 0; /* Keeps all pages identical width regardless of contents */
  width: 100%;
}

section {
  margin-bottom: 2.5rem;
}

.desktop-only-title {
  display: none;
}

h2 {
  font-size: 1.2rem;
  font-weight: 600;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.4rem;
  margin-bottom: 1.25rem;
}

/* Publication Lists */
.pub-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.pub-list li {
  font-size: 0.95rem;
}

.links {
  font-size: 0.85rem;
  margin-top: 0.25rem;
  display: inline-block;
}

/* CV Lists */
.cv-entry {
  display: flex;
  flex-direction: column;
  margin-bottom: 1rem;
  font-size: 0.95rem;
}

.cv-meta {
  font-weight: 600;
  color: var(--text-main);
}

.cv-sub {
  color: var(--text-muted);
}

.cv-date {
  font-family: var(--font-mono);
  color: var(--text-light);
  font-size: 0.85rem;
}

/* News Lists */
.news-list {
  list-style: none;
  padding: 0; /* Explicitly reset to match .pub-list */
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.news-item {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  font-size: 0.95rem;
}

.news-date {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-light);
}

.news-text {
  color: var(--text-main);
  flex: 1;
}

/* Research Tags */
.research-list {
  list-style: none !important;
  padding: 0 !important;
  margin: 0 !important;
  display: flex !important;
  flex-direction: column !important;
  gap: 0.5rem !important;
  margin-left: 1.5rem !important; /* Indents the entire list */
}

.research-list li {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.research-list li::before {
  content: "-";
  margin-right: 0.6rem;
  color: var(--text-light);
}

/* --- Desktop Layout (min-width: 768px) --- */
@media (min-width: 768px) {
  .layout {
    flex-direction: row;
    gap: 4.5rem;
    padding: 4rem 1.5rem;
    align-items: flex-start;
  }

  .side-nav {
    width: 150px;
    position: sticky;
    top: 4rem;
    flex-shrink: 0;
    border-bottom: none;
    padding-bottom: 0;
    gap: 1.5rem;
  }

  .profile-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
  }

  .profile-photo {
    width: 110px;
    height: 110px;
    margin-bottom: 0.5rem;
  }

  .profile-meta {
    display: none;
  }

  .desktop-only-title {
    display: block;
    margin-bottom: 1.5rem;
  }

  .desktop-only-title h1 {
    font-size: 1.7rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
  }

  .desktop-only-title p {
    color: var(--text-muted);
    font-size: 1rem;
  }

  .nav-links {
    flex-direction: column;
    gap: 0.6rem;
  }

  .social-links {
    flex-direction: column;
    gap: 0.4rem;
    border-top: 1px solid var(--border-color);
    padding-top: 1.25rem;
  }

  .cv-entry {
    flex-direction: row;
    justify-content: space-between;
    align-items: baseline;
  }

  .cv-desc {
    flex: 1;
  }

  .cv-date {
    text-align: right;
    min-width: 100px;
  }

  .news-item {
    flex-direction: row;
    align-items: baseline;
    gap: 1.5rem;
  }

  .news-date {
    min-width: 90px;
    flex-shrink: 0;
  }
}