@import url("https://fonts.googleapis.com/css2?family=SF+Pro+Text:wght@400;600;700&family=SF+Pro+Display:wght@600;700&family=SF+Mono:wght@400;600&display=swap");

:root {
  --bg: #f5f5f7;
  --bg-2: #ffffff;
  --surface: #ffffff;
  --ink: #1d1d1f;
  --muted: #6e6e73;
  --accent: #0071e3;
  --accent-dark: #005bb5;
  --accent-2: #34c759;
  --border: 1px solid rgba(29, 29, 31, 0.12);
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.08);
  --radius: 18px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  background: linear-gradient(180deg, var(--bg), var(--bg-2));
  min-height: 100vh;
  line-height: 1.6;
}

a {
  color: inherit;
  text-decoration: none;
}

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

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

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 28px 0 12px;
}

.brand {
  font-family: "SF Pro Display", "Helvetica Neue", Arial, sans-serif;
  font-size: 1rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.brand-icon {
  width: 22px;
  height: 22px;
}

.nav-links {
  display: flex;
  gap: 18px;
  font-size: 0.95rem;
}

.nav-links a {
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid transparent;
}

.nav-links a:hover {
  border-color: rgba(0, 113, 227, 0.3);
  background: rgba(0, 113, 227, 0.08);
}

.hero {
  display: block;
  padding: 48px 0 32px;
}

.hero-banner {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.hero h1 {
  font-family: "SF Pro Display", "Helvetica Neue", Arial, sans-serif;
  font-size: clamp(2.2rem, 4vw, 3.2rem);
  margin: 0;
}

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

.hero-tags {
  margin-top: 6px;
}

.button {
  font-weight: 600;
  padding: 12px 18px;
  border-radius: 999px;
  border: 1px solid var(--accent);
  background: transparent;
  color: var(--accent);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  text-decoration: none;
}

.button:hover {
  transform: translateY(-2px);
  color: var(--accent-dark);
  border-color: var(--accent-dark);
}

.button.primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 12px 18px rgba(0, 113, 227, 0.18);
}

.button.secondary {
  background: transparent;
  color: var(--accent);
  border-color: rgba(0, 113, 227, 0.5);
  box-shadow: none;
  text-decoration: none;
}

.button.primary:hover {
  color: #fff;
  background: var(--accent-dark);
  border-color: var(--accent-dark);
}

.button.secondary:hover {
  color: var(--accent-dark);
  border-color: rgba(0, 91, 181, 0.6);
}

.section {
  padding: 36px 0;
}

.section-title {
  font-family: "SF Pro Display", "Helvetica Neue", Arial, sans-serif;
  font-size: 1.4rem;
  margin: 0 0 16px;
}

.section-header {
  display: flex;
  align-items: baseline;
  justify-content: flex-start;
  gap: 10px;
  margin-bottom: 16px;
}

.section-header .section-title {
  margin: 0;
}

.section-link {
  color: var(--accent);
  font-weight: 400;
  text-decoration: none;
  font-size: 0.85rem;
}

.section-link:hover {
  color: var(--accent-dark);
}

.post-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 22px;
}

.card {
  background: var(--surface);
  border-radius: 18px;
  padding: 22px;
  border: var(--border);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.06);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.card h3 {
  margin: 0;
  font-size: 1.15rem;
}

.category-label {
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}

.tag-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: auto;
}

.tag {
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(0, 113, 227, 0.12);
  color: var(--accent);
  border: 1px solid transparent;
}

.tag:hover {
  background: rgba(0, 91, 181, 0.18);
  color: var(--accent-dark);
  border-color: rgba(0, 91, 181, 0.35);
}

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

.card .meta {
  text-align: justify;
}

.meta-pill {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: 999px;
  background: rgba(110, 110, 115, 0.16);
  color: var(--muted);
  font-size: 0.75rem;
  letter-spacing: 0.02em;
  margin-right: 8px;
}

.read-link {
  color: var(--accent);
  font-weight: 600;
  text-decoration: none;
  font-size: 0.92rem;
}

.read-link:hover {
  color: var(--accent-dark);
}

.split {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 28px;
}

.highlight {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 26px;
  border: var(--border);
}

.footer {
  padding: 32px 0 48px;
  color: var(--muted);
  font-size: 0.9rem;
}

.footer a {
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.article {
  padding: 36px 0 60px;
}

.article-header {
  margin-bottom: 28px;
}

.article-title {
  font-family: "SF Pro Display", "Helvetica Neue", Arial, sans-serif;
  font-size: clamp(2rem, 3vw, 2.6rem);
  margin: 0 0 8px;
}

.article-meta {
  color: var(--muted);
  font-size: 0.95rem;
}

.content {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 30px;
  border: var(--border);
  box-shadow: var(--shadow);
}

.content h2,
.content h3,
.content h4 {
  font-family: "SF Pro Display", "Helvetica Neue", Arial, sans-serif;
  margin-top: 28px;
}

.content h2 {
  font-size: 1.35rem;
}

.content h3 {
  font-size: 1.15rem;
}

.content pre {
  background: #1d1d1f;
  color: #f5f5f7;
  padding: 18px;
  border-radius: 12px;
  overflow-x: auto;
  font-family: "SF Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.9rem;
}

.content pre code {
  color: inherit;
}

.content .highlight,
.content pre {
  border: 1px solid rgba(29, 29, 31, 0.14);
}

.content code {
  background: rgba(29, 29, 31, 0.08);
  padding: 2px 6px;
  border-radius: 6px;
}

.content pre code {
  background: transparent;
  padding: 0;
}

.content .highlight .c { color: #9da2a8; }
.content .highlight .k { color: #ff9f0a; }
.content .highlight .o { color: #f5f5f7; }
.content .highlight .s { color: #34c759; }
.content .highlight .mi { color: #ff453a; }
.content .highlight .nf { color: #64d2ff; }
.content .highlight .nc { color: #bf5af2; }
.content .highlight .nt { color: #ff9f0a; }
.content .highlight .na { color: #64d2ff; }

.content code {
  font-family: "SF Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.9rem;
}

.content a {
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}
.content table {
  width: 100%;
  border-collapse: collapse;
  margin: 18px 0;
  font-size: 0.95rem;
}

.content th,
.content td {
  border-bottom: 1px solid rgba(29, 29, 31, 0.12);
  text-align: left;
  padding: 10px;
}

.content th {
  font-family: "SF Pro Display", "Helvetica Neue", Arial, sans-serif;
}

.back-link {
  display: inline-flex;
  gap: 6px;
  align-items: center;
  color: var(--accent);
  margin-bottom: 16px;
  font-weight: 600;
}

.fade-in {
  opacity: 0;
  transform: translateY(8px);
  animation: fade-in 0.7s ease forwards;
}

.fade-in.delay-1 {
  animation-delay: 0.15s;
}

.fade-in.delay-2 {
  animation-delay: 0.3s;
}

.fade-in.delay-3 {
  animation-delay: 0.45s;
}

@keyframes fade-in {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 720px) {
  .nav {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .hero {
    padding-top: 24px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: flex-start;
  }

  .content {
    padding: 22px;
  }
}