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

:root {
  --bg: #ffffff;
  --surface: #f7f7f7;
  --border: #e8e8e8;
  --text: #111111;
  --muted: #666666;
  --radius: 8px;
}

body {
  font-family: 'Times New Roman', Times, serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

/* Nav */
header {
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
}

nav {
  max-width: 900px;
  margin: 0 auto;
  padding: 1rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.5px;
}

nav ul {
  list-style: none;
  display: flex;
  gap: 1.75rem;
}

nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.15s;
}

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

.page-hero {
  padding: 4rem 0 2rem;
}

/* Layout */
main {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 2rem;
}

section {
  padding: 5rem 0;
  border-bottom: 1px solid var(--border);
}

section:last-child {
  border-bottom: none;
}

/* Hero */
.hero {
  min-height: 50vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.hero h1 {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -2px;
}

.tagline {
  margin-top: 1rem;
  font-size: 1rem;
  color: var(--muted);
}

/* Section headings */
h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  letter-spacing: -0.5px;
}

.section-desc {
  color: var(--muted);
  margin-bottom: 2rem;
  font-size: 0.95rem;
}

.section-desc a {
  color: var(--text);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* Projects */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  text-decoration: none;
  color: inherit;
  display: block;
  transition: border-color 0.15s, transform 0.15s;
}

.card:hover {
  border-color: var(--text);
  transform: translateY(-2px);
}

.card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.card p {
  color: var(--muted);
  font-size: 0.875rem;
  margin-bottom: 1rem;
}

.card-link {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text);
}

/* Library */
.book-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
  gap: 1.25rem;
}

.book-card {
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  transition: opacity 0.15s;
}

.book-card:hover {
  opacity: 0.7;
}

.book-card img {
  width: 100%;
  aspect-ratio: 2/3;
  object-fit: cover;
  border-radius: 4px;
  border: 1px solid var(--border);
}

.book-cover-placeholder {
  width: 100%;
  aspect-ratio: 2/3;
  background: var(--surface);
  border-radius: 4px;
  border: 1px solid var(--border);
}

.book-info h3 {
  font-size: 0.78rem;
  font-weight: 600;
  line-height: 1.3;
}

.book-info p {
  font-size: 0.72rem;
  color: var(--muted);
}

/* Blog */
.post-list {
  display: flex;
  flex-direction: column;
}

.post-item {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 2rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--border);
  text-decoration: none;
  color: inherit;
  transition: opacity 0.15s;
}

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

.post-item:hover {
  opacity: 0.65;
}

.post-item h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.post-item p {
  font-size: 0.875rem;
  color: var(--muted);
}

.post-date {
  font-size: 0.8rem;
  color: var(--muted);
  white-space: nowrap;
  flex-shrink: 0;
  padding-top: 0.2rem;
}

/* States */
.loading, .fallback {
  color: var(--muted);
  font-size: 0.9rem;
}

.fallback a {
  color: var(--text);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* Footer */
footer {
  text-align: center;
  padding: 2rem;
  color: var(--muted);
  font-size: 0.8rem;
  border-top: 1px solid var(--border);
}