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

:root {
  --text: #1a1a1a;
  --text-muted: #666;
  --bg: #fafafa;
  --link: #1a1a1a;
  --link-hover: #555;
  --border: #e0e0e0;
}

[data-theme="dark"] {
  --text: #e8e8e8;
  --text-muted: #999;
  --bg: #111;
  --link: #e8e8e8;
  --link-hover: #aaa;
  --border: #333;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem 1.5rem;
}

main {
  max-width: 480px;
  width: 100%;
}

.photo {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  margin-bottom: 1.5rem;
}

h1 {
  font-size: 2rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.tagline {
  color: var(--text-muted);
  font-size: 1.125rem;
  margin-top: 0.5rem;
}

.links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2.5rem;
}

.links h2 {
  width: 100%;
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0;
}

.links a {
  color: var(--link);
  text-decoration: none;
  font-size: 0.95rem;
  padding: 0.5rem 1rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  transition: color 0.2s, border-color 0.2s;
}

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

.email {
  margin-top: 2rem;
  color: var(--text-muted);
  font-size: 0.9rem;
  letter-spacing: 0.05em;
}

.papers,
.projects {
  margin-top: 2.5rem;
}

.papers h2,
.projects h2 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.papers ul,
.projects ul {
  list-style: none;
}

.papers li,
.projects li {
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
  line-height: 1.4;
}

.papers a,
.projects a {
  color: var(--link);
  text-decoration: none;
  border-bottom: 1px solid var(--border);
  padding-bottom: 1px;
  transition: color 0.2s, border-color 0.2s;
}

.papers a:hover,
.projects a:hover {
  color: var(--link-hover);
  border-color: var(--link-hover);
}

.papers span,
.projects span {
  color: var(--text-muted);
  font-size: 0.8rem;
}

.papers details,
.projects details {
  margin-top: 0.5rem;
}

.papers summary,
.projects summary {
  font-size: 0.85rem;
  color: var(--text-muted);
  cursor: pointer;
  list-style: none;
}

.papers summary::-webkit-details-marker,
.projects summary::-webkit-details-marker {
  display: none;
}

.papers summary::before,
.projects summary::before {
  content: "+ ";
}

.papers details[open] summary::before,
.projects details[open] summary::before {
  content: "- ";
}

.papers details ul,
.projects details ul {
  margin-top: 0.5rem;
}

.cv {
  margin-top: 0.75rem;
}

.cv a {
  display: inline-block;
  color: var(--text);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 700;
  padding: 0.5rem 1.25rem;
  border: 1px solid var(--text);
  border-radius: 6px;
  transition: background 0.2s, color 0.2s;
}

.cv a:hover {
  background: var(--text);
  color: var(--bg);
}

.resume {
  margin-top: 2rem;
}

.resume a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 1px;
  transition: color 0.2s, border-color 0.2s;
}

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

.theme-toggle {
  position: fixed;
  top: 1.25rem;
  right: 1.25rem;
  background: none;
  border: 1px solid var(--border);
  border-radius: 50%;
  width: 36px;
  height: 36px;
  cursor: pointer;
  font-size: 1rem;
  line-height: 1;
  color: var(--text);
  transition: border-color 0.2s;
}

.theme-toggle:hover {
  border-color: var(--text);
}

footer {
  margin-top: 4rem;
  color: var(--text-muted);
  font-size: 0.8rem;
}