:root {
  color-scheme: light;
  --bar-color: #b7ceec;
  --text-color: #000000;
  --background-color: #f0f8ff;
  --surface-color: rgba(255, 255, 255, 0.68);
  --border-color: rgba(0, 0, 0, 0.18);
  --muted-color: rgba(0, 0, 0, 0.68);
  --hover-color: rgba(0, 0, 0, 0.1);
  --focus-color: rgba(0, 0, 0, 0.25);
  --shadow-subtle: 0 1px 2px rgba(0, 0, 0, 0.08);
}

html[data-theme="dark"] {
  color-scheme: dark;
  --bar-color: #646d7e;
  --text-color: #ffffff;
  --background-color: #1c1c1c;
  --surface-color: rgba(255, 255, 255, 0.08);
  --border-color: rgba(255, 255, 255, 0.2);
  --muted-color: rgba(255, 255, 255, 0.72);
  --hover-color: rgba(255, 255, 255, 0.14);
  --focus-color: rgba(255, 255, 255, 0.35);
  --shadow-subtle: 0 1px 2px rgba(0, 0, 0, 0.28);
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
}

body {
  margin: 0;
  background-color: var(--background-color);
  color: var(--text-color);
  display: flex;
  flex-direction: column;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.65;
  min-height: 100vh;
}

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

a:hover {
  text-decoration: underline;
}

.site-header {
  background-color: var(--bar-color);
  border-bottom: 1px solid var(--border-color);
  box-shadow: var(--shadow-subtle);
}

.site-header-inner {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  justify-content: space-between;
  margin: 0 auto;
  max-width: 1120px;
  padding: 0.9rem 1.25rem;
}

.site-logo {
  color: var(--text-color);
  font-size: 1.3rem;
  font-weight: 800;
  letter-spacing: 0;
  white-space: nowrap;
}

.site-nav,
.site-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.site-nav {
  flex: 1;
  justify-content: center;
}

.site-actions {
  justify-content: flex-end;
}

.site-nav-link {
  border-radius: 999px;
  color: var(--text-color);
  font-size: 1.06rem;
  font-weight: 600;
  padding: 0.45rem 0.8rem;
  transition:
    background-color 160ms ease,
    transform 160ms ease;
}

.site-nav-link:hover {
  background-color: var(--hover-color);
  text-decoration: none;
  transform: translateY(-1px);
}

.theme-toggle,
.language-select,
.mobile-menu-toggle {
  appearance: none;
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: 999px;
  color: var(--text-color);
  cursor: pointer;
  font: inherit;
  font-size: 1rem;
  font-weight: 650;
  line-height: 1.2;
  min-height: 2.4rem;
  padding: 0.55rem 0.9rem;
  transition:
    background-color 160ms ease,
    border-color 160ms ease,
    transform 160ms ease;
}

.theme-toggle {
  align-items: center;
  display: inline-flex;
  font-size: 1.15rem;
  justify-content: center;
  min-width: 2.6rem;
  padding-left: 0.65rem;
  padding-right: 0.65rem;
}

.theme-toggle:hover,
.language-select:hover,
.mobile-menu-toggle:hover {
  background-color: var(--hover-color);
  border-color: var(--focus-color);
  transform: translateY(-1px);
}

.theme-toggle:focus-visible,
.language-select:focus-visible,
.mobile-menu-toggle:focus-visible,
.site-nav-link:focus-visible,
.site-logo:focus-visible {
  outline: 3px solid var(--focus-color);
  outline-offset: 2px;
}

.language-switcher {
  position: relative;
}

.language-switcher::after {
  border-left: 0.3rem solid transparent;
  border-right: 0.3rem solid transparent;
  border-top: 0.38rem solid var(--text-color);
  content: "";
  pointer-events: none;
  position: absolute;
  right: 0.85rem;
  top: 50%;
  transform: translateY(-35%);
}

.language-select {
  min-width: 7rem;
  padding-right: 2.1rem;
}

.mobile-menu-toggle,
.mobile-menu-panel {
  display: none;
}

.mobile-menu-panel {
  border-top: 1px solid var(--border-color);
  margin: 0 auto;
  max-width: 1120px;
  padding: 0.45rem 1.25rem 1rem;
}

.mobile-menu-panel .site-nav-link {
  display: block;
  margin-top: 0.35rem;
  width: 100%;
}

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

.site-main {
  flex: 1;
  margin: 0 auto;
  max-width: 760px;
  padding: 3rem 1.25rem;
  width: 100%;
}

.site-main h1 {
  font-size: clamp(2rem, 4vw, 2.75rem);
  line-height: 1.2;
  margin: 0 0 1rem;
}

.site-main h2 {
  font-size: 1.35rem;
  line-height: 1.3;
  margin: 2rem 0 0.75rem;
}

.site-main p,
.site-main ul {
  margin: 0 0 1rem;
}

.post-list {
  display: grid;
  gap: 1.25rem;
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
}

.post-list__item {
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.25rem;
}

.post-list__item h2 {
  margin-top: 0;
}

.post-meta {
  color: var(--muted-color);
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

.read-more {
  font-weight: 600;
}

.site-footer {
  background-color: var(--background-color);
  border-top: 1px solid var(--border-color);
  color: var(--text-color);
  padding: 0.75rem 1rem;
  text-align: center;
}

.site-footer p {
  margin: 0.2rem 0;
}

.site-footer a {
  text-decoration: underline;
  text-underline-offset: 0.15em;
}

.site-footer a:hover {
  opacity: 0.75;
}

@media (max-width: 760px) {
  .site-header-inner {
    flex-wrap: wrap;
    gap: 0.65rem;
    padding: 0.75rem 1rem;
  }

  .site-logo {
    flex: 1 1 auto;
    font-size: 1.15rem;
  }

  .site-nav {
    display: none;
  }

  .site-actions {
    flex: 0 1 auto;
    gap: 0.45rem;
    justify-content: flex-end;
  }

  .theme-toggle,
  .language-select,
  .mobile-menu-toggle {
    font-size: 0.92rem;
    min-height: 2.15rem;
    padding: 0.45rem 0.7rem;
  }

  .theme-toggle {
    font-size: 1.05rem;
    min-width: 2.3rem;
    padding-left: 0.55rem;
    padding-right: 0.55rem;
  }

  .language-select {
    min-width: 5.7rem;
    padding-right: 1.8rem;
  }

  .language-switcher::after {
    right: 0.7rem;
  }

  .mobile-menu-toggle {
    display: inline-flex;
    align-items: center;
  }

  .mobile-menu-panel:not([hidden]) {
    display: block;
  }
}