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

/* Tokens */
:root {
  --bg:         #FFFFFF;
  --text:       #1D1D1F;
  --muted:      #6E6E73;
  --border:     #E5E5EA;
  --tag-bg:     #F5F5F7;
  --max-width:  680px;
}

/* Base */
html {
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: inherit;
}

/* ---- Nav ---- */
nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 52px;
  width: 100%;
}

.nav-home {
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  text-decoration: none;
  color: var(--text);
}

.nav-links {
  display: flex;
  gap: 1.75rem;
}

.nav-links a {
  font-size: 0.88rem;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.15s;
}

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

/* ---- Main ---- */
main {
  flex: 1;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 4rem 1.5rem 5rem;
  width: 100%;
}

/* ---- Hero ---- */
.hero {
  margin-bottom: 1.75rem;
}

.hero h1 {
  font-size: 2rem;
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 0.45rem;
}

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

/* ---- Bio ---- */
.bio {
  margin-bottom: 3rem;
}

.bio p {
  font-size: 1rem;
  margin-bottom: 1rem;
}

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

.bio a {
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: var(--border);
  transition: text-decoration-color 0.15s;
}

.bio a:hover {
  text-decoration-color: var(--text);
}

/* ---- Section links (home nav cards) ---- */
.section-links {
  border-top: 1px solid var(--border);
}

.section-link {
  border-bottom: 1px solid var(--border);
}

.section-link a {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.1rem 0;
  text-decoration: none;
  transition: opacity 0.15s;
}

.section-link a:hover {
  opacity: 0.55;
}

.section-link-title {
  font-size: 0.95rem;
  font-weight: 500;
  white-space: nowrap;
}

.section-link-desc {
  font-size: 0.85rem;
  color: var(--muted);
  text-align: right;
}

/* ---- Page title ---- */
h1.page-title {
  font-size: 1.75rem;
  font-weight: 600;
  letter-spacing: -0.025em;
  margin-bottom: 2.5rem;
}

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

.post-item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--border);
  text-decoration: none;
  transition: opacity 0.15s;
}

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

.post-item:hover {
  opacity: 0.55;
}

.post-title {
  font-size: 0.95rem;
}

.post-date {
  font-size: 0.78rem;
  color: var(--muted);
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
  flex-shrink: 0;
}

/* ---- Project list ---- */
.project-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.project {
  border-top: 1px solid var(--border);
  padding: 1.75rem 0;
}

.project:last-child {
  border-bottom: 1px solid var(--border);
}

.project-header {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin-bottom: 0.55rem;
}

.project-name {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  text-decoration: none;
  transition: opacity 0.15s;
}

.project-name:hover {
  opacity: 0.55;
}

.project-status {
  font-size: 0.62rem;
  font-weight: 500;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  padding: 0.18rem 0.5rem;
  border-radius: 3px;
}

.project-status.active {
  background: #E8F5E9;
  color: #2E7D32;
}

.project-status.archived {
  background: var(--tag-bg);
  color: var(--muted);
}

.project-desc {
  font-size: 0.92rem;
  color: var(--muted);
  line-height: 1.65;
  margin-bottom: 0.85rem;
}

.project-tags {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.project-tags span {
  font-size: 0.7rem;
  color: var(--muted);
  background: var(--tag-bg);
  padding: 0.18rem 0.55rem;
  border-radius: 4px;
  letter-spacing: 0.01em;
}

/* ---- Curiosities ---- */
.curiosities {
  border-top: 1px solid var(--border);
}

.curiosity-group {
  border-bottom: 1px solid var(--border);
  padding: 1.1rem 0;
}

.curiosity-label {
  display: block;
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--muted);
  margin-bottom: 0.6rem;
}

.curiosity-items {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.curiosity-item {
  font-size: 0.92rem;
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: var(--border);
  transition: text-decoration-color 0.15s;
}

.curiosity-item:hover {
  text-decoration-color: var(--text);
}

/* ---- Empty state ---- */
.empty-state {
  color: var(--muted);
  font-size: 0.92rem;
  font-style: italic;
}

/* ---- Footer ---- */
footer {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.5rem 1.5rem 2.5rem;
  width: 100%;
  border-top: 1px solid var(--border);
}

footer a {
  font-size: 0.82rem;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.15s;
}

footer a:hover {
  color: var(--text);
}

/* ---- Article / Post ---- */
.post {
  max-width: 100%;
}

.post-header {
  margin-bottom: 3rem;
  padding-bottom: 1.75rem;
  border-bottom: 1px solid var(--border);
}

.post-header h1 {
  font-size: 1.75rem;
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.25;
  margin-bottom: 0.75rem;
}

.post-meta {
  font-size: 0.82rem;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.post-body {
  font-size: 1rem;
  line-height: 1.85;
  color: var(--text);
}

.post-body h2 {
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 2.25rem 0 0.75rem;
  color: var(--text);
}

.post-body h3 {
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 1.75rem 0 0.5rem;
  color: var(--text);
}

.post-body p {
  margin-bottom: 1.25rem;
}

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

.post-body ul,
.post-body ol {
  margin: 0 0 1.25rem 1.25rem;
}

.post-body li {
  margin-bottom: 0.45rem;
}

.post-body strong {
  font-weight: 600;
  color: var(--text);
}

.post-body em {
  font-style: italic;
}

.post-body blockquote {
  border-left: 2px solid var(--border);
  padding-left: 1.1rem;
  margin: 1.5rem 0;
  color: var(--muted);
  font-style: italic;
}

.post-body a {
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: var(--border);
  transition: text-decoration-color 0.15s;
}

.post-body a:hover {
  text-decoration-color: var(--text);
}

.post-back {
  display: inline-block;
  font-size: 0.82rem;
  color: var(--muted);
  text-decoration: none;
  margin-bottom: 2.5rem;
  transition: color 0.15s;
}

.post-back:hover {
  color: var(--text);
}

/* ---- Mobile ---- */
@media (max-width: 600px) {
  html { font-size: 16px; }

  main {
    padding: 2.5rem 1.25rem 4rem;
  }

  .hero h1 {
    font-size: 1.65rem;
  }

  .section-link a {
    flex-direction: column;
    gap: 0.2rem;
  }

  .section-link-desc {
    text-align: left;
  }

  .post-item {
    flex-direction: column;
    gap: 0.15rem;
  }
}