:root {
  --color-bg: #F4F6FB;
  --color-surface: #FFFFFF;
  --color-surface-alt: #E8ECF5;
  --color-text: #0F172A;
  --color-text-muted: #475569;
  --color-accent: #2563EB;
  --color-accent-soft: #38BDF8;
  --color-border: rgba(148, 163, 184, 0.4);
  --color-code-bg: #E2E8F0;
  --shadow-lg: 0 32px 60px rgba(37, 99, 235, 0.16);
  --shadow-md: 0 24px 48px rgba(15, 23, 42, 0.08);
  --shadow-sm: 0 12px 24px rgba(15, 23, 42, 0.06);
  --font-body: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
  --font-heading: "Antonio", "Segoe UI", system-ui, sans-serif;
  --body-text-font: var(--font-body);
  --header-font: var(--font-heading);
  --link-color: var(--color-accent);
}

* {
  box-sizing: border-box;
}

html {
  font-size: 16px;
}

body {
  margin: 0;
  padding: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

a:focus-visible {
  outline: 3px solid var(--color-accent-soft);
  outline-offset: 2px;
}

main {
  max-width: 1200px;
  margin: 0 auto;
  background: var(--color-surface);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  box-shadow: var(--shadow-md);
}

main > * {
  padding-left: clamp(1.5rem, 3vw, 3rem);
  padding-right: clamp(1.5rem, 3vw, 3rem);
}

main h1,
main h2,
main h3,
main h4,
main h5,
main h6 {
  font-family: var(--font-heading);
  color: var(--color-text);
  letter-spacing: 0.02em;
}

main h1 {
  font-size: clamp(2.2rem, 4.2vw, 3.2rem);
}

main h2 {
  font-size: clamp(1.8rem, 3.4vw, 2.6rem);
}

main h3 {
  font-size: clamp(1.5rem, 2.6vw, 2.1rem);
}

main h4 {
  font-size: clamp(1.3rem, 2.1vw, 1.6rem);
}

main h5 {
  font-size: clamp(1.15rem, 1.8vw, 1.35rem);
}

main h6 {
  font-size: clamp(1.05rem, 1.5vw, 1.2rem);
}

p {
  margin: 0 0 1.25rem;
}

img {
  max-width: 100%;
  height: auto;
  border-radius: 12px;
  box-shadow: var(--shadow-sm);
}

figure {
  margin: 2rem 0;
}

figcaption {
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

blockquote {
  margin: 2rem 0;
  padding: 1.5rem 2rem;
  border-left: 4px solid var(--color-accent);
  background: var(--color-surface-alt);
  color: var(--color-text-muted);
  font-style: italic;
}

code,
pre {
  font-family: "Fira Code", "Source Code Pro", Menlo, Consolas, "Liberation Mono", monospace;
  background: var(--color-code-bg);
  border-radius: 8px;
}

code {
  padding: 0.15rem 0.35rem;
}

pre {
  padding: 1.25rem 1.5rem;
  overflow: auto;
  box-shadow: var(--shadow-sm);
}

hr {
  border: 0;
  height: 1px;
  background: var(--color-border);
  margin: 3rem 0;
}

button,
.btn,
input[type="submit"] {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 1.6rem;
  background: var(--color-accent);
  color: #fff;
  border: none;
  border-radius: 999px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s ease, transform 0.2s ease;
}

button:hover,
.btn:hover,
input[type="submit"]:hover {
  background: var(--color-accent-soft);
  color: var(--color-text);
  transform: translateY(-1px);
}

button:focus-visible,
.btn:focus-visible,
input[type="submit"]:focus-visible {
  outline: 3px solid var(--color-accent-soft);
  outline-offset: 2px;
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 1.2rem;
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

footer {
  margin-top: auto;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.12), rgba(56, 189, 248, 0.05));
  color: var(--color-text);
}

footer a {
  color: var(--color-text);
}

@media (max-width: 768px) {
  main {
    box-shadow: none;
  }

  main > * {
    padding-left: 1.25rem;
    padding-right: 1.25rem;
  }

  img {
    border-radius: 8px;
  }
}