:root {
  --bg: #f7f9fc;
  --surface: #ffffff;
  --surface-alt: #eef2f8;
  --text: #1e2a3a;
  --muted: #516074;
  --accent: #0d6b8a;
  --accent-strong: #0a4e65;
  --border: #d6deea;
  --max-width: 860px;
  --radius: 12px;
  --shadow: 0 8px 24px rgba(16, 38, 60, 0.08);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: "Segoe UI", "Noto Sans", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top right, rgba(13, 107, 138, 0.12), transparent 40%),
    radial-gradient(circle at bottom left, rgba(10, 78, 101, 0.08), transparent 35%),
    var(--bg);
  line-height: 1.65;
}

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

a:hover {
  color: var(--accent-strong);
  text-decoration: underline;
}

.site-shell {
  min-height: 100dvh;
  display: grid;
  grid-template-rows: auto 1fr auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem clamp(1rem, 3vw, 2rem);
  backdrop-filter: blur(6px);
  background-color: rgba(247, 249, 252, 0.9);
  border-bottom: 1px solid var(--border);
}

.brand {
  font-weight: 700;
  letter-spacing: 0.01em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.site-nav a {
  padding: 0.25rem 0.2rem;
}

.site-nav a.active {
  color: var(--accent-strong);
  border-bottom: 2px solid var(--accent-strong);
}

.nav-toggle {
  display: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  padding: 0.35rem 0.6rem;
  cursor: pointer;
}

.site-main {
  width: min(var(--max-width), calc(100% - 2rem));
  margin: 1.5rem auto 2rem;
  padding: clamp(1rem, 2vw, 1.5rem);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.loading-state,
.error-state {
  color: var(--muted);
  text-align: center;
  padding: 2rem 1rem;
}

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

.markdown-content blockquote {
  margin: 1rem 0;
  padding: 0.75rem 1rem;
  border-left: 4px solid var(--accent);
  background: var(--surface-alt);
}

.markdown-content pre {
  border-radius: 10px;
  border: 1px solid var(--border);
  overflow-x: auto;
}

.markdown-content code {
  font-family: Consolas, "Courier New", monospace;
}

.post-meta {
  color: var(--muted);
  margin-bottom: 1rem;
}

.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1.2rem;
}

.tag {
  display: inline-block;
  background: var(--surface-alt);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.15rem 0.55rem;
  font-size: 0.85rem;
}

.post-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.9rem;
}

.post-item {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.8rem 1rem;
  background: #fbfcff;
}

.post-item h3 {
  margin: 0;
  font-size: 1.05rem;
}

.gist-wrap {
  margin: 1.1rem 0;
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
}

.gist-head {
  background: var(--surface-alt);
  padding: 0.55rem 0.8rem;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
  color: var(--muted);
}

.gist-file {
  margin: 0;
}

.site-footer {
  padding: 1rem;
  text-align: center;
  color: var(--muted);
}

@media (max-width: 740px) {
  .nav-toggle {
    display: inline-block;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    right: 1rem;
    display: none;
    flex-direction: column;
    align-items: flex-start;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 0.6rem;
    min-width: 180px;
    box-shadow: var(--shadow);
  }

  .site-nav.open {
    display: flex;
  }
}