:root {
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-right: env(safe-area-inset-right, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-left: env(safe-area-inset-left, 0px);

  --mycolor: lch(60% 90 320);
  --theme-shift: oklch(from var(--mycolor) l c calc(h - 120));

  --color-bg: oklch(96% 0.01 250);
  --color-surface: oklch(100% 0 0);
  --color-surface-soft: oklch(93% 0.02 250);
  --color-text: oklch(24% 0.03 255);
  --color-heading: oklch(38% 0.11 255);
  --color-accent: oklch(62% 0.17 300);
  --color-accent-hover: oklch(56% 0.17 300);
  --color-border: oklch(84% 0.02 250);
  --color-highlight: var(--theme-shift);
  --color-button-text: oklch(99% 0.01 250);

  --max-width: 1120px;
  --radius: 18px;
  --radius-pill: 999px;
  --shadow: 0 12px 28px rgba(0, 0, 0, 0.08);
  --shadow-hover: 0 16px 36px rgba(0, 0, 0, 0.12);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.5;
}

body {
  margin: 0;
  color: var(--color-text);
  background:
    radial-gradient(circle at top left, var(--color-surface-soft), transparent 35%),
    linear-gradient(180deg, var(--color-surface-soft), var(--color-bg));
}

img {
  max-width: 100%;
  display: block;
}

.site-shell {
  min-height: 100vh;
  padding:
    calc(1rem + var(--safe-top))
    calc(1rem + var(--safe-right))
    calc(1rem + var(--safe-bottom))
    calc(1rem + var(--safe-left));
}

.wrapper {
  width: min(100%, var(--max-width));
  margin: 0 auto;
}

.site-header,
.card,
.site-footer {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.site-header {
  padding: 2rem;
  margin-bottom: 1.5rem;
  position: relative;
  overflow: hidden;
}

.site-header::before {
  content: "";
  position: absolute;
  top: -50px;
  right: -50px;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  background: var(--color-highlight);
  opacity: 0.15;
}

.site-header::after {
  content: "";
  position: absolute;
  bottom: -70px;
  left: -50px;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  background: var(--color-accent);
  opacity: 0.08;
}

.site-header h1 {
  margin: 0 0 0.5rem;
  color: var(--color-heading);
  font-size: clamp(2rem, 4vw, 3rem);
  position: relative;
  z-index: 1;
}

.tagline {
  margin: 0 0 1.25rem;
  font-size: 1.05rem;
  max-width: 42rem;
  position: relative;
  z-index: 1;
}

.site-nav {
  position: relative;
  z-index: 1;
  margin-top: 1rem;
  margin-bottom: 2rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--color-border);
}

.site-nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin: 0;
  padding: 0;
}

.site-nav li {
  display: flex;
}

.site-nav a {
  display: inline-block;
  text-decoration: none;
  background: linear-gradient(135deg, var(--color-accent), var(--color-highlight));
  color: var(--color-button-text);
  padding: 0.8rem 1.15rem;
  border-radius: var(--radius-pill);
  font-weight: 700;
  letter-spacing: 0.02em;
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.10);
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease,
    filter 0.2s ease;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
  filter: brightness(1.03);
}

.site-nav a[aria-current="page"] {
  background: var(--color-surface);
  color: var(--color-heading);
  border: 2px solid var(--color-highlight);
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.06);
}

.content-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.card {
  padding: 1.5rem;
  border-left: 8px solid var(--color-highlight);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.card h2,
.card h3 {
  margin-top: 0;
  color: var(--color-heading);
}

.card p:last-child,
.card ul:last-child {
  margin-bottom: 0;
}

.card ul {
  padding-left: 1.2rem;
}

.card li + li {
  margin-top: 0.45rem;
}

.site-footer {
  margin-top: 1.5rem;
  padding: 1.25rem;
}

.site-footer p {
  margin: 0.4rem 0;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
}

.footer-links a {
  display: inline-block;
  text-decoration: none;
  background: linear-gradient(135deg, var(--color-heading), var(--color-accent));
  color: var(--color-button-text);
  font-weight: 700;
  padding: 0.7rem 1rem;
  border-radius: var(--radius-pill);
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.10);
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease,
    filter 0.2s ease;
}

.footer-links a:hover,
.footer-links a:focus-visible {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
  filter: brightness(1.04);
}

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

/* tablet and up */
@media (min-width: 700px) {
  .content-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* desktop computers */
@media (min-width: 1024px) {
  .wrapper {
    width: min(100%, 1120px);
  }

  .site-header {
    padding: 2.5rem;
  }

  .content-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .card {
    padding: 1.75rem;
  }

  .site-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
  }

  .site-footer p {
    margin: 0;
  }
}

/* smaller screens */
@media (max-width: 699px) {
  .site-header,
  .card,
  .site-footer {
    padding: 1rem;
  }

  .site-nav ul,
  .footer-links {
    flex-direction: column;
    align-items: stretch;
  }

  .site-nav a,
  .footer-links a {
    width: 100%;
    text-align: center;
  }
}