:root {
  color-scheme: dark;
  color: #111827;
  background: #f8fafc;
  font-family: 'Inter', system-ui, sans-serif;
  line-height: 1.6;
  font-feature-settings: 'cv02' 1;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  min-height: 100%;
}

body {
  background: linear-gradient(180deg, #ffffff 0%, #eef2ff 100%);
  color: #111827;
}

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

a {
  color: #2563eb;
  text-decoration: none;
}

a:hover,
a:focus {
  text-decoration: underline;
}

button,
input,
textarea {
  font: inherit;
}

.site-body {
  min-height: 100vh;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  padding: 1rem 2rem;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(15, 23, 42, 0.08);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.site-header__brand {
  display: grid;
  gap: 0.25rem;
}

.site-logo {
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: #111827;
}

.site-tagline {
  margin: 0;
  color: #475569;
  font-size: 0.95rem;
}

.site-header__toggle {
  background: rgba(37, 99, 235, 0.1);
  border: 1px solid rgba(37, 99, 235, 0.18);
  padding: 0.7rem 1rem;
  border-radius: 999px;
  color: #1d4ed8;
  font-weight: 600;
  cursor: pointer;
  display: none;
}

.site-header__nav {
  display: flex;
  align-items: center;
}

.site-nav__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 1.25rem;
}

.site-nav__item:last-child .site-nav__link {
  padding-right: 0;
}

.site-nav__link {
  color: #0f172a;
  font-weight: 600;
  transition: color 0.2s ease, transform 0.2s ease;
}

.site-nav__link:hover,
.site-nav__link:focus {
  color: #2563eb;
  transform: translateY(-1px);
}

.site-main {
  padding: 2rem;
}

.site-grid {
  display: grid;
  gap: 2rem;
  grid-template-columns: minmax(0, 1fr) 320px;
}

.site-content {
  max-width: 850px;
  margin: 0 auto;
  width: 100%;
}

.site-sidebar {
  position: sticky;
  top: 1rem;
  align-self: start;
  background: #ffffff;
  border: 1px solid rgba(15, 23, 42, 0.08);
  border-radius: 1rem;
  padding: 1.5rem;
  box-shadow: 0 20px 60px rgba(15, 23, 42, 0.05);
}

.widget {
  margin-bottom: 1.75rem;
}

.widget__title {
  margin: 0 0 1rem;
  font-size: 0.95rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: #334155;
}

.search-form {
  display: grid;
  gap: 0.75rem;
}

.search-form input {
  width: 100%;
  padding: 0.95rem 1rem;
  border: 1px solid rgba(15, 23, 42, 0.12);
  border-radius: 0.85rem;
  transition: border-color 0.2s ease;
}

.search-form input:focus {
  outline: none;
  border-color: #2563eb;
}

.search-form button {
  padding: 0.85rem 1rem;
  border: none;
  color: #ffffff;
  background: #2563eb;
  border-radius: 0.85rem;
  cursor: pointer;
}

.site-footer {
  padding: 2rem;
  background: #111827;
  color: #e2e8f0;
  text-align: center;
}

.page-hero,
.card,
.post-card,
.not-found {
  background: #ffffff;
  border-radius: 1.25rem;
  padding: 2rem;
  border: 1px solid rgba(15, 23, 42, 0.08);
  box-shadow: 0 24px 80px rgba(15, 23, 42, 0.06);
}

.page-hero header,
.post-card,
.card,
.not-found {
  display: grid;
  gap: 1rem;
}

.page-hero h1,
.card h2,
.post-card h2,
.not-found h1 {
  margin: 0;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1.5rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.95rem 1.75rem;
  border: 1px solid transparent;
  border-radius: 999px;
  background: #f8fafc;
  color: #111827;
  text-decoration: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.button:hover,
.button:focus {
  transform: translateY(-1px);
  box-shadow: 0 10px 25px rgba(37, 99, 235, 0.14);
}

.button--primary {
  background: #2563eb;
  color: #ffffff;
}

.home-cards,
.category-grid,
.post-list,
.page-list {
  display: grid;
  gap: 1.5rem;
}

.home-cards {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.post-list {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.category-grid,
.page-list {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

@media (max-width: 960px) {
  .site-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .site-header__toggle {
    display: inline-flex;
  }

  .site-header__nav {
    width: 100%;
    display: none;
    margin-top: 1rem;
  }

  .site-header__nav--open {
    display: block;
  }

  .site-nav__list {
    flex-direction: column;
    gap: 0.75rem;
  }

  .site-main {
    padding: 1.25rem;
  }

  .site-grid {
    grid-template-columns: 1fr;
  }

  .site-sidebar {
    position: static;
  }
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}