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

:root {
  --text-primary: #2c2c2c;
  --text-secondary: #737373;
  --accent: #0066cc;
  --bg: #fafafa;
  --bg-secondary: #f4f4f4;
  --border-color: #e8e8e8;
  --scrollbar-thumb: #d0d0d0;
  --scrollbar-hover: #b0b0b0;
  --nav-width: 160px;
  --photo-bg: #e0e0e0;
}

[data-theme="dark"] {
  --text-primary: #e6e6e6;
  --text-secondary: #a3a3a3;
  --accent: #66b3ff;
  --bg: #1a1a1a;
  --bg-secondary: #262626;
  --border-color: #333333;
  --scrollbar-thumb: #404040;
  --scrollbar-hover: #555555;
  --photo-bg: #333333;
}

body {
  font-family: 'Söhne', 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.55;
  color: var(--text-primary);
  background: var(--bg);
  font-size: 14px;
  font-weight: 400;
  transition: background-color 0.3s ease, color 0.3s ease;
}

.wrapper {
  display: flex;
  max-width: 1100px;
  margin: 0 auto;
}

nav {
  position: fixed;
  width: var(--nav-width);
  height: 100vh;
  padding: 50px 0 50px 40px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

nav ul {
  list-style: none;
}

nav > ul > li {
  margin-bottom: 8px;
}

nav a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 13px;
  display: block;
  padding: 2px 0;
  transition: color 0.15s;
  letter-spacing: 0.01em;
  cursor: pointer;
}

nav a:hover,
nav a.active {
  color: var(--accent);
}

nav .sub-nav {
  display: none;
  margin-top: 5px;
  margin-left: 10px;
}

nav .sub-nav.show {
  display: block;
}

nav .sub-nav li {
  margin-bottom: 4px;
}

nav .sub-nav a {
  font-size: 12px;
  color: var(--text-secondary);
  opacity: 0.8;
}

nav > ul > li.nav-separator {
  margin-top: 20px;
  padding-top: 15px;
  border-top: 1px solid var(--border-color);
}

.theme-toggle-container {
  margin-top: auto;
  padding-top: 20px;
}

.theme-toggle {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 12px;
  font-family: inherit;
  padding: 0;
  opacity: 0.7;
  transition: opacity 0.2s;
}

.theme-toggle:hover {
  opacity: 1;
  color: var(--accent);
  text-decoration: underline;
}

main {
  margin-left: calc(var(--nav-width) + 100px);
  padding: 50px 0;
  max-width: 580px;
}

.page {
  display: none;
  animation: fadeIn 0.3s ease-out;
}

.page.active {
  display: block;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

header {
  margin-bottom: 25px;
}

h1 {
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 4px;
  letter-spacing: -0.01em;
  color: var(--text-primary);
}

.subtitle {
  font-size: 13px;
  color: var(--text-secondary);
  font-weight: 400;
}

section {
  margin-bottom: 25px;
  scroll-margin-top: 20px;
}

h2 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

h3 {
  font-size: 14px;
  font-weight: 600;
  margin-top: 12px;
  margin-bottom: 6px;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

p {
  margin-bottom: 8px;
  color: var(--text-primary);
  font-size: 14px;
}

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

a:hover {
  text-decoration: underline;
}

.paper-list, .project-list, .note-list {
  list-style: none;
}

.paper-list li, .project-list li, .note-list li {
  margin-bottom: 14px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border-color);
}

.paper-list li:last-child, .project-list li:last-child, .note-list li:last-child {
  border-bottom: none;
}

.paper-title {
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 3px;
  font-size: 14px;
  line-height: 1.4;
}

.paper-venue {
  font-style: italic;
  color: var(--text-secondary);
  font-size: 12px;
}

.paper-authors {
  color: var(--text-secondary);
  font-size: 12px;
  margin-bottom: 3px;
}

.paper-links {
  margin-top: 5px;
  font-size: 12px;
}

.paper-links a {
  margin-right: 8px;
  color: var(--accent);
}

.topic {
  margin-bottom: 15px;
}

.contact-info {
  color: var(--text-secondary);
  font-size: 14px;
}

.contact-info p {
  margin-bottom: 6px;
  line-height: 1.5;
}

.abstract {
  display: none;
  margin-top: 6px;
  padding: 10px;
  background: var(--bg-secondary);
  border-left: 2px solid var(--accent);
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.5;
  border-radius: 2px;
}

.abstract.show {
  display: block;
}

.toggle-abstract {
  cursor: pointer;
  color: var(--accent);
  font-size: 12px;
  user-select: none;
}

.toggle-abstract:hover {
  text-decoration: underline;
}

footer {
  margin-top: 35px;
  padding-top: 12px;
  border-top: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 12px;
}

.photo {
  width: 120px;
  height: 120px;
  float: right;
  margin: 0 0 15px 20px;
  border-radius: 3px;
  background: var(--photo-bg);
  background-size: cover;
  background-position: center;
}

.about-content {
  overflow: auto;
}

.project-title {
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 3px;
  font-size: 14px;
}

.project-meta {
  color: var(--text-secondary);
  font-size: 12px;
  margin-bottom: 4px;
}

.project-desc {
  font-size: 13px;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.project-links {
  margin-top: 4px;
  font-size: 12px;
}

.project-links a {
  margin-right: 8px;
  color: var(--accent);
}

.note-list li {
  margin-bottom: 18px;
  padding-bottom: 18px;
}

.note-title {
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 2px;
  font-size: 14px;
  cursor: pointer;
  transition: color 0.15s;
}

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

.content-placeholder, .edit-hint {
  color: var(--text-secondary);
  font-size: 13px;
}

.edit-hint {
  margin-top: 10px;
}

.note-date {
  color: var(--text-secondary);
  font-size: 12px;
  margin-bottom: 5px;
}

.note-excerpt {
  font-size: 13px;
  color: var(--text-primary);
  line-height: 1.5;
}

.note-full {
  margin-bottom: 30px;
}

.note-full .note-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
  cursor: default;
  color: var(--text-primary);
}

.note-full .note-date {
  margin-bottom: 15px;
}

.note-content {
  font-size: 14px;
  line-height: 1.6;
}

.note-content p {
  margin-bottom: 12px;
}

.back-link {
  display: inline-block;
  margin-bottom: 20px;
  color: var(--text-secondary);
  font-size: 13px;
  cursor: pointer;
}

.back-link:hover {
  color: var(--accent);
}

.tier-list {
  margin-top: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.tier-row {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 1rem;
  padding: 0.4rem 0;
  border-bottom: 1px solid #e0e0e0;
}

.tier-row:last-child {
  border-bottom: none;
}

.tier-label {
  font-weight: 600;
  font-size: 1rem;
  color: #555;
}

.tier-items {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.8rem;
}

.tier-item {
  font-size: 0.95rem;
  white-space: nowrap;
}

[data-theme="dark"] .tier-row {
  border-bottom: 1px solid #444;
}

[data-theme="dark"] .tier-label {
  color: #bbb;
}

blockquote {
  margin: 1rem 0;
  padding: 0.5rem 1rem;
  border-left: 3px solid var(--accent);
  background: var(--bg-secondary);
  font-style: italic;
  color: var(--text-secondary);
}

@media (max-width: 900px) {
  nav {
    position: relative;
    width: 100%;
    height: auto;
    padding: 20px;
    display: block;
  }

  nav > ul {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
  }

  nav .sub-nav {
    display: none !important;
  }

  nav > ul > li.nav-separator {
    border: none;
    margin-top: 0;
    padding-top: 0;
  }
  
  .theme-toggle-container {
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid var(--border-color);
    text-align: left;
  }

  main {
    margin-left: 0;
    padding: 30px 20px;
    max-width: 100%;
  }

  .wrapper {
    flex-direction: column;
  }
}

html {
  scroll-behavior: smooth;
}

::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--scrollbar-hover);
}