:root {
  --primary: #0096cc;
  --primary-dark: #007199;
  --accent: #ff5522;
  --ink: #1b1f24;
  --muted: #5d6b75;
  --bg: #f5f8fb;
  --surface: #ffffff;
  --border: #e2e9ef;
  --shadow: 0 18px 50px rgba(9, 26, 42, 0.08);
}

body[data-theme="dark"] {
  --ink: #e7edf2;
  --muted: #a7b3bd;
  --bg: #0d141b;
  --surface: #111a23;
  --border: #1f2b36;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.4);
}

* {
  box-sizing: border-box;
}

html {
  font-size: 16px;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "IBM Plex Sans", "Space Grotesk", "Segoe UI", sans-serif;
  line-height: 1.6;
}

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

a:hover {
  color: var(--primary-dark);
}

img {
  max-width: 100%;
  height: auto;
}

.page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  width: min(1100px, 92vw);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  backdrop-filter: blur(12px);
  background: color-mix(in srgb, var(--bg), transparent 15%);
  border-bottom: 1px solid color-mix(in srgb, var(--border), transparent 20%);
  z-index: 10;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.2rem 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  font-size: 1.15rem;
  color: var(--ink);
}

.brand-mark {
  width: 34px;
  height: 34px;
}

.brand-text {
  color: var(--ink);
}

.nav {
  display: flex;
  gap: 1.2rem;
  font-size: 0.95rem;
}

.nav a {
  color: var(--muted);
  font-weight: 500;
}

.nav a:hover {
  color: var(--primary);
}

.nav-icons {
  align-items: center;
}

.icon-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
  transition: border-color 0.2s ease, transform 0.2s ease, color 0.2s ease, background 0.2s ease;
}

.icon-link svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.icon-img {
  width: 18px;
  height: 18px;
  display: block;
  filter: brightness(0);
}

.icon-link:hover {
  border-color: color-mix(in srgb, var(--ink), transparent 60%);
  background: color-mix(in srgb, var(--surface), var(--bg) 40%);
  transform: translateY(-1px);
}

.icon-label {
  position: absolute;
  bottom: -30px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--ink);
  color: var(--surface);
  font-size: 0.72rem;
  padding: 0.2rem 0.45rem;
  border-radius: 999px;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.15s ease, transform 0.15s ease;
}

.icon-link:hover .icon-label {
  opacity: 1;
  transform: translate(-50%, -2px);
}

.theme-toggle {
  border-style: dashed;
}

.theme-dot {
  width: 18px;
  height: 18px;
  border-radius: 999px;
  background: conic-gradient(from 90deg, #0e1a23 0 50%, #f5f8fb 50% 100%);
  border: 1px solid color-mix(in srgb, var(--ink), transparent 60%);
}

body[data-theme="dark"] .icon-img {
  filter: brightness(0) invert(1);
}

body[data-theme="dark"] .icon-link {
  background: #0e1a23;
  color: #f5f8fb;
  border-color: #1f2b36;
}

body[data-theme="dark"] .icon-link:hover {
  background: #0a141c;
}

.content {
  flex: 1;
}

.hero {
  padding: 4.5rem 0 2.5rem;
}

.hero-compact {
  padding: 3.5rem 0 1.5rem;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--primary-dark);
  margin: 0 0 0.8rem;
}

.hero h1 {
  font-size: clamp(2.2rem, 3.8vw, 3.5rem);
  line-height: 1.15;
  margin: 0 0 1rem;
  letter-spacing: -0.03em;
}

.lede {
  font-size: 1.1rem;
  color: var(--muted);
  max-width: 46rem;
  margin: 0;
}

.post-list {
  padding: 1.5rem 0 4rem;
}

.list-header h2 {
  margin: 0 0 1.5rem;
  font-size: 1.4rem;
}

.post-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 1.6rem 1.8rem;
  box-shadow: var(--shadow);
  margin-bottom: 1.4rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.post-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 24px 60px rgba(9, 26, 42, 0.12);
}

.post-card h3 {
  margin: 0 0 0.4rem;
  font-size: 1.4rem;
}

.post-card h3 a {
  color: var(--ink);
}

.post-meta {
  color: var(--muted);
  font-size: 0.9rem;
  margin: 0 0 0.9rem;
}

.post-summary {
  margin: 0 0 1rem;
  color: #2c343b;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag {
  background: rgba(0, 150, 204, 0.12);
  color: var(--primary-dark);
  font-size: 0.75rem;
  padding: 0.3rem 0.6rem;
  border-radius: 999px;
  font-weight: 600;
}

.pagination {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 2rem;
  color: var(--muted);
}

.page-link {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 0.5rem 1rem;
  border-radius: 999px;
  color: var(--primary-dark);
  font-weight: 600;
}

.post {
  padding: 4rem 0 4.5rem;
}

.post-header h1 {
  margin: 0 0 1rem;
  font-size: clamp(2rem, 3.4vw, 3rem);
  letter-spacing: -0.02em;
}

.post-body {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 2.5rem 2.6rem;
  box-shadow: var(--shadow);
}

.related,
.share {
  margin-top: 2.5rem;
}

.related-list {
  display: grid;
  gap: 0.75rem;
}

.related-item {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 0.9rem 1rem;
  color: var(--ink);
}

.share-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
}

.search {
  padding: 1.5rem 0 4rem;
}

.search-box {
  margin-bottom: 1.5rem;
}

.search-box input {
  width: 100%;
  padding: 0.9rem 1rem;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--ink);
  font-size: 1rem;
}

.search-results .post-card {
  margin-bottom: 1rem;
}

.search-empty {
  color: var(--muted);
}

.cta-row {
  display: flex;
  gap: 0.75rem;
  margin-top: 1rem;
  flex-wrap: wrap;
}

.footer-links {
  display: flex;
  gap: 0.6rem;
  align-items: center;
  flex-wrap: wrap;
  font-size: 0.85rem;
}

.post-body h2,
.post-body h3,
.post-body h4 {
  margin-top: 2.2rem;
  margin-bottom: 0.8rem;
  color: var(--ink);
}

.post-body p {
  margin: 0 0 1.2rem;
}

.post-body ul,
.post-body ol {
  padding-left: 1.2rem;
}

.post-body li {
  margin-bottom: 0.5rem;
}

.post-body blockquote {
  border-left: 3px solid var(--primary);
  margin: 1.5rem 0;
  padding: 0.4rem 1rem;
  color: var(--muted);
  background: rgba(0, 150, 204, 0.08);
}

pre,
code {
  font-family: "JetBrains Mono", "SFMono-Regular", Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  font-size: 0.92rem;
}

pre {
  background: #0e1a23;
  color: #e8f0f6;
  padding: 1.1rem 1.2rem;
  border-radius: 14px;
  overflow-x: auto;
}

code {
  background: rgba(0, 150, 204, 0.12);
  padding: 0.1rem 0.3rem;
  border-radius: 6px;
}

pre code {
  background: none;
  padding: 0;
  color: inherit;
}

.site-footer {
  border-top: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface), transparent 20%);
  padding: 2rem 0 3rem;
}

.footer-inner {
  color: var(--muted);
  font-size: 0.9rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

@media (max-width: 720px) {
  .header-inner {
    flex-direction: column;
    gap: 0.7rem;
    align-items: flex-start;
  }

  .nav {
    flex-wrap: wrap;
  }

  .post-card {
    padding: 1.4rem;
  }

  .post-body {
    padding: 1.8rem 1.6rem;
  }
}