:root {
  color-scheme: light dark;
  --background-color: #ffffff;
  --text-color: #202124;
  --surface-border-color: #dadce0;
  --surface-muted-color: #5f6368;
  --link-color: #5f6368;
  --link-hover-color: #202124;
  --link-background-interactive: rgba(26, 115, 232, 0.08);
  --link-outline: #3b6fcf;
  --link-outline-soft: rgba(59, 111, 207, 0.18);
}

@media (prefers-color-scheme: dark) {
  :root {
    --background-color: #202124;
    --text-color: #e8eaed;
    --surface-border-color: #5f6368;
    --surface-muted-color: #9aa0a6;
    --link-color: #bdc1c6;
    --link-hover-color: #ffffff;
    --link-background-interactive: rgba(138, 180, 248, 0.18);
    --link-outline: #7fa8f0;
    --link-outline-soft: rgba(127, 168, 240, 0.28);
  }
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Roboto", "Helvetica Neue", Arial, sans-serif;
  background-color: var(--background-color);
  color: var(--text-color);
  display: flex;
  align-items: center;
  justify-content: center;
}

main {
  text-align: center;
  padding: 48px 24px 64px;
  max-width: 640px;
  width: 100%;
}

/* ── Home page ── */

.image-placeholder {
  width: min(420px, 70vw);
  height: 210px;
  margin: 24px auto 40px;
  border: 1px solid var(--surface-border-color);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--surface-muted-color);
  font-size: 14px;
  letter-spacing: 0.02em;
  background-image: url('background.jpg');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  overflow: hidden;
}

nav {
  margin-bottom: 48px;
}

nav ul {
  list-style: none;
  padding: 0;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
  column-gap: 16px;
  row-gap: 1rem;
  width: min(420px, 90vw);
  justify-items: center;
}

@media (max-width: 480px) {
  nav ul {
    grid-template-columns: 1fr;
    row-gap: 1.25rem;
  }
}

nav a,
.contact-link {
  color: var(--link-color);
  text-decoration: none;
  font-size: 1.0625rem;
  line-height: 1.5;
  font-weight: 400;
  padding: 6px 12px;
  border-radius: 999px;
  display: inline-block;
  transition: color 0.2s ease, background-color 0.2s ease, outline-color 0.2s ease,
    box-shadow 0.2s ease;
}

@media (prefers-reduced-motion: reduce) {
  nav a,
  .contact-link {
    transition: none;
  }
}

nav a:hover,
.contact-link:hover {
  color: var(--link-hover-color);
  text-decoration: none;
  background-color: var(--link-background-interactive);
  outline: none;
  box-shadow: none;
}

nav a:focus-visible,
.contact-link:focus-visible {
  color: var(--link-hover-color);
  text-decoration: none;
  background-color: var(--link-background-interactive);
  outline: 2px solid var(--link-outline);
  outline-offset: 2px;
  box-shadow: 0 0 0 2px var(--link-outline-soft);
}

@supports not selector(:focus-visible) {
  nav a:focus,
  .contact-link:focus {
    color: var(--link-hover-color);
    text-decoration: none;
    background-color: var(--link-background-interactive);
    outline: 2px solid var(--link-outline);
    outline-offset: 2px;
    box-shadow: 0 0 0 2px var(--link-outline-soft);
  }
}

.contact-link {
  margin-bottom: 28px;
}

footer {
  font-size: 13px;
  color: var(--surface-muted-color);
}

/* ── Sub-pages ── */

main.subpage {
  text-align: left;
}

main.subpage h1 {
  margin-top: 0;
  margin-bottom: 4px;
}

main.subpage p {
  font-family: inherit;
  font-size: 1rem;
  line-height: 1.65;
}

main.subpage .contact-link {
  display: block;
  width: fit-content;
  margin-top: 8px;
  margin-right: auto;
  margin-bottom: 32px;
  margin-left: auto;
}

main.subpage footer {
  text-align: center;
}

.back-link {
  display: inline-block;
  margin-bottom: 32px;
  color: var(--surface-muted-color);
  text-decoration: none;
  font-size: 0.9375rem;
  padding: 4px 10px;
  border-radius: 999px;
  transition: color 0.2s ease, background-color 0.2s ease;
}

.back-link:hover {
  color: var(--text-color);
  background-color: var(--link-background-interactive);
}

@media (prefers-reduced-motion: reduce) {
  .back-link {
    transition: none;
  }
}

/* ── Blog tag filter ── */

.tag-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 32px;
}

.tag-btn {
  background: none;
  border: 1px solid var(--surface-border-color);
  color: var(--surface-muted-color);
  font-family: inherit;
  font-size: 0.875rem;
  padding: 4px 14px;
  border-radius: 999px;
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.tag-btn:hover,
.tag-btn.active {
  color: var(--text-color);
  border-color: var(--text-color);
  background-color: var(--link-background-interactive);
}

@media (prefers-reduced-motion: reduce) {
  .tag-btn {
    transition: none;
  }
}

/* ── Post list (blog index) ── */

.post-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.post-list li {
  padding: 16px 0;
  border-bottom: 1px solid var(--surface-border-color);
}

.post-list li:first-child {
  border-top: 1px solid var(--surface-border-color);
}

.post-title {
  color: var(--text-color);
  text-decoration: none;
  font-size: 1rem;
  font-weight: 500;
  line-height: 1.4;
}

.post-title:hover {
  text-decoration: underline;
}

.post-meta {
  margin-top: 4px;
  font-size: 0.8125rem;
  color: var(--surface-muted-color);
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.tag-chip {
  border: 1px solid var(--surface-border-color);
  border-radius: 999px;
  padding: 1px 8px;
  font-size: 0.75rem;
  color: var(--surface-muted-color);
}

/* ── Post content (individual post pages) ── */

.post-content {
  line-height: 1.7;
  font-size: 1rem;
  margin-top: 24px;
}

.post-content h2,
.post-content h3 {
  margin-top: 2em;
  margin-bottom: 0.5em;
  font-weight: 500;
}

.post-content p {
  margin: 1em 0;
}

.post-content a {
  color: var(--link-color);
}

.post-content a:hover {
  color: var(--link-hover-color);
}

.post-content blockquote {
  border-left: 3px solid var(--surface-border-color);
  margin: 1em 0;
  padding: 0.25em 1em;
  color: var(--surface-muted-color);
}

.post-content pre {
  background-color: var(--link-background-interactive);
  padding: 1em;
  border-radius: 6px;
  overflow-x: auto;
  font-size: 0.875rem;
}

.post-content code {
  font-size: 0.875rem;
}

.post-content img {
  max-width: 100%;
  height: auto;
  border-radius: 6px;
}

/* ── Status badges (list entries) ── */

.status-badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 1px 7px;
  border-radius: 999px;
  vertical-align: middle;
  margin-left: 8px;
  border: 1px solid var(--surface-border-color);
  color: var(--surface-muted-color);
}

/* ── Post page banners (detail pages) ── */

.post-banner {
  padding: 10px 16px;
  border-radius: 6px;
  margin-bottom: 24px;
  font-size: 0.875rem;
  line-height: 1.5;
  border: 1px solid var(--surface-border-color);
  color: var(--surface-muted-color);
  background-color: var(--link-background-interactive);
}