:root {
  --color-bg: #ffffff;
  --color-text: #1a1a1a;
  --color-muted: #666666;
  --color-accent: #c0392b;
  --color-border: #e0e0e0;
  --font-sans: system-ui, -apple-system, sans-serif;
  --font-mono: ui-monospace, monospace;
  --spacing-unit: 1rem;
  --max-width: 860px;
}

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-unit);
}

#site-header {
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-unit) 0;
}

#site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-title {
  font-weight: 700;
  text-decoration: none;
  color: var(--color-text);
}

nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: calc(var(--spacing-unit) * 1.5);
}

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

nav a:hover,
nav a[aria-current="page"] {
  color: var(--color-accent);
}

#content {
  padding: calc(var(--spacing-unit) * 2) 0;
}

#site-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-unit) 0;
  color: var(--color-muted);
  font-size: 0.875rem;
}

h1, h2, h3 { line-height: 1.3; }

a { color: var(--color-accent); }

/* Language switcher */
.header-right {
  display: flex;
  align-items: center;
  gap: calc(var(--spacing-unit) * 2);
}

.lang-switcher ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: calc(var(--spacing-unit) * 0.5);
}

.lang-switcher a,
.lang-switcher .lang-current {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  text-decoration: none;
  color: var(--color-muted);
  padding: 0.15rem 0.35rem;
  border: 1px solid transparent;
  border-radius: 3px;
}

.lang-switcher a:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.lang-switcher .lang-current {
  color: var(--color-accent);
  border-color: var(--color-accent);
  font-weight: 600;
}

/* -----------------------------------------------
   Post list
----------------------------------------------- */
.posts-ol {
  list-style: none;
  margin: calc(var(--spacing-unit) * 2) 0 0;
  padding: 0;
}

.post-row {
  display: grid;
  grid-template-columns: 7rem 1fr;
  grid-template-rows: auto auto;
  column-gap: var(--spacing-unit);
  padding: calc(var(--spacing-unit) * 0.75) 0;
  border-bottom: 1px solid var(--color-border);
}

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

.post-date {
  grid-row: 1;
  font-size: 0.85rem;
  color: var(--color-muted);
  padding-top: 0.15rem;
  white-space: nowrap;
}

.post-title {
  grid-column: 2;
  grid-row: 1;
  font-weight: 600;
  text-decoration: none;
  color: var(--color-text);
}

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

.post-summary {
  grid-column: 2;
  grid-row: 2;
  margin: 0.25rem 0 0;
  font-size: 0.9rem;
  color: var(--color-muted);
}

.post-header time {
  display: block;
  color: var(--color-muted);
  font-size: 0.875rem;
  margin-top: 0.25rem;
  margin-bottom: calc(var(--spacing-unit) * 1.5);
}

.post-content {
  margin-top: calc(var(--spacing-unit) * 1.5);
}

.post-footer,
.project-footer {
  margin-top: calc(var(--spacing-unit) * 2);
  padding-top: var(--spacing-unit);
  border-top: 1px solid var(--color-border);
  font-size: 0.9rem;
}

/* -----------------------------------------------
   Project grid
----------------------------------------------- */
.project-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: calc(var(--spacing-unit) * 1.5);
  margin-top: calc(var(--spacing-unit) * 2);
}

@media (max-width: 600px) {
  .project-grid {
    grid-template-columns: 1fr;
  }

  .post-row {
    grid-template-columns: 1fr;
  }

  .post-date {
    grid-row: 1;
    margin-bottom: 0.15rem;
  }

  .post-title {
    grid-column: 1;
    grid-row: 2;
  }

  .post-summary {
    grid-column: 1;
    grid-row: 3;
  }
}

.project-card {
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: calc(var(--spacing-unit) * 1.25);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.project-card-title {
  margin: 0;
  font-size: 1.05rem;
}

.project-card-title a {
  text-decoration: none;
  color: var(--color-text);
}

.project-card-title a:hover {
  color: var(--color-accent);
}

.project-card-desc {
  margin: 0;
  font-size: 0.9rem;
  color: var(--color-muted);
  flex-grow: 1;
}

.project-card-link,
.project-url-btn {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 600;
  text-decoration: none;
  color: var(--color-accent);
  border: 1px solid var(--color-accent);
  border-radius: 3px;
  padding: 0.2rem 0.6rem;
  align-self: flex-start;
}

.project-card-link:hover,
.project-url-btn:hover {
  background: var(--color-accent);
  color: var(--color-bg);
}

.project-desc-lead {
  font-size: 1.05rem;
  color: var(--color-muted);
  margin-bottom: calc(var(--spacing-unit) * 1.5);
}

.project-header {
  margin-bottom: calc(var(--spacing-unit) * 1.5);
}

.project-content {
  margin-top: calc(var(--spacing-unit) * 1.5);
}