:root {
  color-scheme: light dark;
  --font-base: 'Inter', 'Noto Sans SC', 'Segoe UI', 'PingFang SC', -apple-system, BlinkMacSystemFont, 'Helvetica Neue', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'SFMono-Regular', Consolas, 'Liberation Mono', monospace;
  --bg: #f7f9fc;
  --bg-elevated: #ffffff;
  --bg-soft: #eef2ff;
  --text: #111827;
  --text-muted: #6b7280;
  --border: #e5e7eb;
  --accent: #6366f1;
  --accent-soft: rgba(99, 102, 241, 0.15);
  --shadow: 0 20px 40px -20px rgba(39, 54, 120, 0.35);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #020817;
    --bg-elevated: #0b1223;
    --bg-soft: rgba(99, 102, 241, 0.12);
    --text: #e5e7ff;
    --text-muted: #a5b4fc;
    --border: rgba(99, 102, 241, 0.25);
    --accent: #818cf8;
    --accent-soft: rgba(129, 140, 248, 0.2);
    --shadow: 0 25px 60px -22px rgba(2, 8, 23, 0.8);
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  min-height: 100%;
}

body {
  background: radial-gradient(circle at top left, rgba(129, 140, 248, 0.14), transparent 45%),
              radial-gradient(circle at 120% 0%, rgba(56, 189, 248, 0.18), transparent 38%),
              var(--bg);
  color: var(--text);
  font-family: var(--font-base);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.25s ease, opacity 0.25s ease;
}

a:hover,
a:focus {
  color: var(--accent);
  outline: none;
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

header.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(12px);
  background: linear-gradient(90deg, rgba(2, 8, 23, 0.72), rgba(2, 8, 23, 0.45)) padding-box,
              linear-gradient(120deg, rgba(99, 102, 241, 0.6), rgba(56, 189, 248, 0.5)) border-box;
  border-bottom: 1px solid rgba(99, 102, 241, 0.25);
  box-shadow: 0 12px 30px -18px rgba(2, 8, 23, 0.9);
}

@media (prefers-color-scheme: light) {
  header.site-header {
    background: linear-gradient(90deg, rgba(255, 255, 255, 0.85), rgba(255, 255, 255, 0.75)) padding-box,
                linear-gradient(120deg, rgba(99, 102, 241, 0.35), rgba(56, 189, 248, 0.3)) border-box;
    border-bottom: 1px solid rgba(99, 102, 241, 0.15);
    box-shadow: 0 22px 45px -30px rgba(99, 102, 241, 0.4);
  }
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.1rem 0;
}

.branding {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.branding a span.brand-title {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.brand-tagline {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.site-nav ul {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

.site-nav a {
  font-size: 0.95rem;
  font-weight: 500;
  opacity: 0.78;
  position: relative;
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.4rem;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), rgba(56, 189, 248, 0.85));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.2s ease;
}

.site-nav a:hover::after,
.site-nav a:focus::after,
.site-nav a.active::after {
  transform: scaleX(1);
}

.site-nav a.active {
  opacity: 1;
  color: var(--accent);
}

.hero {
  position: relative;
  margin: 4.5rem 0 3rem;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.15), rgba(56, 189, 248, 0.1));
  border-radius: 1.5rem;
  padding: 3.75rem clamp(1.75rem, 4vw, 4rem);
  overflow: hidden;
  border: 1px solid rgba(99, 102, 241, 0.18);
  box-shadow: var(--shadow);
}

.hero::before,
.hero::after {
  content: "";
  position: absolute;
  border-radius: 999px;
  filter: blur(0px);
  opacity: 0.6;
}

.hero::before {
  width: 320px;
  height: 320px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.45), transparent 62%);
  top: -160px;
  right: -80px;
}

.hero::after {
  width: 280px;
  height: 280px;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.38), transparent 70%);
  bottom: -120px;
  left: -60px;
}

.hero-content {
  position: relative;
  max-width: 600px;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.hero-kicker {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.35em;
  color: var(--accent);
  font-weight: 600;
}

.hero-title {
  font-size: clamp(2.4rem, 5vw, 3rem);
  line-height: 1.2;
  margin: 0;
}

.hero-subtitle {
  margin: 0;
  font-size: 1.05rem;
  color: var(--text-muted);
}

.hero-highlights {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

.hero-highlights li {
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 500;
  border-radius: 999px;
  padding: 0.45rem 0.95rem;
  font-size: 0.85rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  border-radius: 999px;
  padding: 0.65rem 1.2rem;
  font-size: 0.95rem;
  font-weight: 600;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  cursor: pointer;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), rgba(56, 189, 248, 0.9));
  color: #fff;
  box-shadow: 0 12px 35px -15px rgba(99, 102, 241, 0.8);
}

.btn-primary:hover,
.btn-primary:focus {
  transform: translateY(-2px);
}

.btn-ghost {
  background: transparent;
  border: 1px solid rgba(99, 102, 241, 0.3);
  color: var(--accent);
}

.hero-social {
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
}

.hero-social a {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  padding: 0.3rem 0.6rem;
  border-radius: 999px;
  border: 1px dashed rgba(99, 102, 241, 0.35);
}

.hero-social a:hover {
  color: var(--accent);
  border-color: rgba(99, 102, 241, 0.65);
}

.section-heading {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 1.75rem;
}

.section-heading h2 {
  margin: 0;
  font-size: 1.5rem;
}

.section-heading p {
  margin: 0;
  color: var(--text-muted);
}

.post-grid {
  display: grid;
  gap: 1.75rem;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.post-card {
  background: var(--bg-elevated);
  border-radius: 1.1rem;
  padding: 1.75rem;
  border: 1px solid rgba(99, 102, 241, 0.12);
  box-shadow: 0 18px 40px -28px rgba(15, 23, 42, 0.55);
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

.post-card:hover {
  transform: translateY(-6px);
  border-color: rgba(99, 102, 241, 0.32);
  box-shadow: 0 22px 45px -25px rgba(99, 102, 241, 0.45);
}

.post-card time {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.post-card-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.45rem;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.post-card-meta span.separator {
  opacity: 0.6;
}

.post-card-title {
  margin: 0;
  font-size: 1.25rem;
  letter-spacing: 0.01em;
}

.post-card-summary {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.post-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

.post-card-tags li {
  background: rgba(99, 102, 241, 0.12);
  color: var(--accent);
  border-radius: 999px;
  padding: 0.3rem 0.75rem;
  font-size: 0.8rem;
  font-weight: 600;
}

.pagination {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin: 3rem 0 0;
}

.pagination a,
.pagination span.disabled {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.55rem 1.1rem;
  border-radius: 999px;
  border: 1px solid rgba(99, 102, 241, 0.28);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
}

.pagination a:hover {
  border-color: rgba(99, 102, 241, 0.6);
  color: var(--accent);
}

main.article-wrapper {
  margin-top: 3.5rem;
}

article.post-detail {
  background: var(--bg-elevated);
  border-radius: 1.2rem;
  padding: clamp(1.75rem, 4vw, 3rem);
  border: 1px solid rgba(99, 102, 241, 0.15);
  box-shadow: 0 25px 55px -30px rgba(15, 23, 42, 0.65);
}

.post-detail h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(2rem, 4vw, 2.5rem);
}

.post-detail .post-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.45rem;
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-bottom: 2rem;
}

.post-detail .post-meta .tag-chip {
  padding: 0.25rem 0.7rem;
  background: rgba(99, 102, 241, 0.15);
  border-radius: 999px;
  color: var(--accent);
  font-weight: 600;
}

.post-detail .content {
  color: var(--text);
  font-size: 1.02rem;
  line-height: 1.85;
}

.post-detail .content h2,
.post-detail .content h3,
.post-detail .content h4 {
  margin-top: 2.4rem;
  margin-bottom: 1rem;
}

.post-detail .content pre {
  background: #0f172a;
  color: #e2e8f0;
  padding: 1rem;
  border-radius: 0.85rem;
  overflow-x: auto;
  border: 1px solid rgba(148, 163, 184, 0.18);
  box-shadow: inset 0 0 0 1px rgba(15, 23, 42, 0.6);
}

@media (prefers-color-scheme: light) {
  .post-detail .content pre {
    background: #111827;
    color: #f3f4f6;
  }
}

.post-detail .content code {
  font-family: var(--font-mono);
  font-size: 0.95rem;
}

.post-detail .content blockquote {
  margin: 1.5rem 0;
  padding: 1rem 1.25rem;
  border-left: 4px solid var(--accent);
  background: rgba(99, 102, 241, 0.08);
  border-radius: 0.85rem;
  color: var(--text);
  font-style: italic;
}

footer.site-footer {
  margin-top: 4rem;
  padding: 3rem 0 3.5rem;
  color: var(--text-muted);
}

footer.site-footer .container {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  font-size: 0.85rem;
}

@media (max-width: 768px) {
  .header-inner {
    flex-direction: column;
    gap: 0.8rem;
  }

  .site-nav ul {
    flex-wrap: wrap;
    justify-content: center;
  }

  .hero {
    margin-top: 3.2rem;
    padding: 2.75rem 1.75rem;
  }

  .hero-content {
    gap: 1.25rem;
  }

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

  article.post-detail {
    padding: 1.5rem;
  }
}

code {
  font-family: var(--font-mono);
}

pre code {
  font-size: 0.9rem;
}

img {
  max-width: 100%;
  border-radius: 0.75rem;
}

.table-of-contents {
  margin: 2rem 0;
  padding: 1.2rem 1.5rem;
  border-radius: 1rem;
  background: rgba(99, 102, 241, 0.08);
  border: 1px solid rgba(99, 102, 241, 0.2);
}

.table-of-contents h2 {
  margin-top: 0;
  font-size: 1.1rem;
}

.table-of-contents ul {
  margin: 0.8rem 0 0;
  padding-left: 1.1rem;
  color: var(--text-muted);
}