:root {
  --header-height: 3rem;
  --body-color: hsl(230, 60%, 99%);
  --container-color: #fff;
  --title-color: hsl(230, 20%, 15%);
  --title-color-dark: hsl(230, 20%, 10%);
  --text-color: hsl(230, 8%, 45%);
  --text-color-light: hsl(230, 8%, 65%);
  --small-font-size: 0.875rem;
  --font-medium: 500;
  --z-fixed: 100;
  --z-tooltip: 10;
  --border-color: hsl(230, 20%, 90%);
  --primary-color: hsl(230, 70%, 55%);
  --shadow-sm: 0 2px 8px hsla(230, 70%, 15%, 0.08);
  --shadow-md: 0 4px 16px hsla(230, 70%, 15%, 0.12);
}

body.dark-theme {
  --body-color: hsl(230, 28%, 12%);
  --container-color: hsl(230, 28%, 16%);
  --title-color: hsl(230, 20%, 95%);
  --title-color-dark: hsl(230, 20%, 100%);
  --text-color: hsl(230, 8%, 75%);
  --text-color-light: hsl(230, 8%, 65%);
  --border-color: hsl(230, 20%, 25%);
  --shadow-sm: 0 2px 8px hsla(0, 0%, 0%, 0.3);
  --shadow-md: 0 4px 16px hsla(0, 0%, 0%, 0.4);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 100% 0, hsl(230, 70%, 95%), transparent 32rem),
    radial-gradient(circle at 0 100%, hsl(142, 60%, 96%), transparent 28rem),
    var(--body-color);
  color: var(--text-color);
  font-family: "Poppins", system-ui, -apple-system, "Segoe UI", sans-serif;
  line-height: 1.6;
}

body.dark-theme {
  background:
    radial-gradient(circle at 100% 0, hsl(230, 70%, 25%), transparent 32rem),
    radial-gradient(circle at 0 100%, hsl(142, 60%, 20%), transparent 28rem),
    var(--body-color);
}

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

.shell {
  width: min(968px, calc(100% - 32px));
  margin: 0 auto;
  padding: 9rem 0 5rem;
}

.blog-intro {
  margin: 0 auto 3.5rem;
  text-align: center;
}

.eyebrow {
  margin: 0 0 0.5rem;
  color: var(--primary-color);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.blog-intro h1 {
  margin: 0 0 0.5rem;
  padding: 0 0 0.12em;
  font-size: clamp(2.5rem, 8vw, 4.75rem);
  line-height: 1.15;
  background: linear-gradient(135deg, var(--title-color), var(--primary-color));
  background-clip: text;
  color: transparent;
}

.intro {
  max-width: 62ch;
  margin: 0 auto;
  color: var(--text-color-light);
  font-size: 0.9375rem;
}

.blog-card {
  display: grid;
  max-width: 780px;
  margin: 0 auto;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 2rem;
  align-items: center;
  padding: 2rem;
  border: 1.5px solid var(--border-color);
  border-radius: 0.75rem;
  background: var(--container-color);
  box-shadow: var(--shadow-sm);
  transition:
    transform 180ms ease,
    box-shadow 180ms ease,
    border-color 180ms ease;
}

.blog-card:hover,
.blog-card:focus-visible {
  transform: translateY(-2px);
  border-color: var(--title-color);
  box-shadow: var(--shadow-md);
  outline: none;
}

.number {
  display: block;
  margin-bottom: 1rem;
  color: var(--text-color-light);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
}

.blog-card h2 {
  max-width: 620px;
  margin: 0 0 0.5rem;
  color: var(--title-color);
  font-size: 1.5rem;
  line-height: 1.3;
}

.summary {
  max-width: 610px;
  margin: 0;
  color: var(--text-color);
  font-size: 0.875rem;
}

.arrow {
  display: grid;
  width: 40px;
  height: 40px;
  place-items: center;
  border-radius: 0.5rem;
  background: var(--primary-color);
  color: #fff;
}

@media (max-width: 768px) {
  .shell {
    width: min(100% - 24px, 968px);
    padding: 3.5rem 0 4rem;
  }

  .blog-intro {
    margin-bottom: 2.5rem;
  }

  .blog-card {
    grid-template-columns: 1fr;
    gap: 1.5rem;
    padding: 1.5rem;
  }

  .arrow {
    justify-self: end;
  }
}