:root {
  --bg: #F7F8FA;
  --fg: #1A1A1A;
  --muted: #666666;
  --line: rgba(0, 0, 0, 0.05);
  --header-height: 64px;
  --header-offset: calc(var(--header-height) + 12px);
}

.site-header,
.site-header *,
.site-footer,
.site-footer * {
  box-sizing: border-box;
}

.wrap {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 24px;
  box-sizing: border-box;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: #FFFFFF;
  border-bottom: 1px solid var(--line);
  color: var(--fg);
  font-family: 'Inter', -apple-system, system-ui, sans-serif;
  line-height: 1.5;
}

.site-header__bar {
  min-height: var(--header-height);
  display: flex;
  align-items: center;
  background: #FFFFFF;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.site-header__bar .wrap {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr auto;
  column-gap: 24px;
  align-items: center;
  width: 100%;
}

.site-header__local-nav {
  width: 100%;
}

.site-mode-tabs {
  width: 100%;
  max-width: 1440px;
  min-height: 56px;
  margin: 0 auto;
  padding: 0 48px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  border-top: 1px solid var(--line);
  background: #FFFFFF;
}

.site-mode-tabs .tool-mode-tab {
  min-width: 0;
  min-height: 56px;
  padding: 0 12px;
  border: 0;
  border-bottom: 3px solid transparent;
  border-radius: 0;
  background: transparent;
  color: #A1A5AD;
  font: inherit;
  font-size: 16px;
  font-weight: 760;
  letter-spacing: -0.03em;
  cursor: pointer;
}

.site-mode-tabs .tool-mode-tab:hover,
.site-mode-tabs .tool-mode-tab:focus-visible {
  background: #FAFAFA;
  color: var(--fg);
}

.site-mode-tabs .tool-mode-tab.is-active,
.site-mode-tabs .tool-mode-tab--active {
  background: transparent;
  color: var(--fg);
  border-bottom-color: var(--fg);
  box-shadow: none;
}

.brand {
  display: flex;
  align-items: center;
}

.brand a {
  display: inline-flex;
  line-height: 0;
}

.header-logo {
  width: 44px;
  height: 28px;
  display: block;
  opacity: 0.9;
  transition: opacity 0.3s ease;
}

.header-logo:hover {
  opacity: 1;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 13px;
  font-weight: 600;
}

.nav-links--edge {
  grid-column: 3;
  justify-self: end;
}

.site-header__utilities {
  grid-column: 3;
  justify-self: end;
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: flex-end;
  gap: 12px;
  min-width: 0;
}

.site-header__utilities .nav-links--edge {
  grid-column: auto;
  justify-self: auto;
}

.site-settings-button {
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 0 10px;
  border: 1px solid transparent;
  border-radius: 10px;
  background: transparent;
  color: var(--fg);
  font: inherit;
  font-size: 13px;
  font-weight: 700;
  white-space: nowrap;
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.site-settings-button:hover,
.site-settings-button[aria-expanded="true"] {
  background: #F8F8F8;
  border-color: transparent;
}

.site-settings-button:focus-visible,
.site-settings-menu__item:focus-visible,
.site-settings-dialog button:focus-visible {
  outline: 3px solid #93c5fd;
  outline-offset: 2px;
}

.site-settings-button__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  font-size: 19px;
  line-height: 1;
}

.site-settings-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  z-index: 1200;
  width: max-content;
  min-width: 214px;
  padding: 7px;
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: 14px;
  background: #FFFFFF;
  box-shadow: 0 16px 36px rgba(17, 24, 39, 0.16);
}

.site-settings-menu__item {
  display: block;
  width: 100%;
  min-height: 40px;
  padding: 9px 12px;
  border: 0;
  border-radius: 9px;
  background: transparent;
  color: #374151;
  font: inherit;
  font-size: 13px;
  line-height: 1.35;
  text-align: left;
  text-decoration: none;
  cursor: pointer;
}

.site-settings-menu__item:hover {
  background: #F5F6F8;
  color: var(--fg);
}

.site-settings-backdrop {
  position: fixed;
  inset: 0;
  z-index: 1300;
  display: grid;
  place-items: center;
  padding: 20px;
  background: rgba(17, 24, 39, 0.48);
}

.site-settings-dialog {
  width: min(100%, 520px);
  max-height: min(720px, 90vh);
  overflow: auto;
  padding: 24px;
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: 20px;
  background: #FFFFFF;
  box-shadow: 0 24px 80px rgba(17, 24, 39, 0.28);
  color: var(--fg);
}

.site-settings-dialog__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.site-settings-dialog__header h2 {
  margin: 0;
  font-size: 20px;
  line-height: 1.3;
}

.site-settings-dialog__close {
  width: 36px;
  height: 36px;
  flex: 0 0 auto;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #FFFFFF;
  color: var(--fg);
  font-size: 24px;
  line-height: 1;
  cursor: pointer;
}

.site-settings-dialog__body {
  margin: 18px 0 0;
  color: #4B5563;
  font-size: 14px;
  line-height: 1.7;
  white-space: pre-wrap;
}

.site-settings-dialog__button {
  width: 100%;
  min-height: 44px;
  margin-top: 20px;
  border: 1px solid #1A1A1A;
  border-radius: 12px;
  background: #1A1A1A;
  color: #FFFFFF;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

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

.nav-links a {
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s;
}

.nav-links a:hover,
.nav-links a.is-active {
  color: var(--fg);
}

.nav-links a.is-active {
  font-weight: 800;
}

.nav-links .sep {
  color: var(--line);
  font-weight: 300;
}

.site-primary-nav {
  position: absolute;
  left: 50%;
  z-index: 1;
  transform: translateX(-50%);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #F8F8F8;
  font-size: 13px;
  font-weight: 800;
  white-space: nowrap;
}

.site-primary-nav a {
  min-height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 16px;
  border-radius: 999px;
  color: var(--muted);
  text-decoration: none;
  transition: background 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}

.site-primary-nav a:hover,
.site-primary-nav a:focus-visible {
  background: #FFFFFF;
  color: var(--fg);
}

.site-primary-nav a[aria-current="page"] {
  background: var(--fg);
  color: #FFFFFF;
  font-weight: 900;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.18);
}

.site-primary-nav a[aria-current="page"]:hover,
.site-primary-nav a[aria-current="page"]:focus-visible {
  background: var(--fg);
  color: #FFFFFF;
}

.site-footer {
  padding: 60px 0 calc(60px + env(safe-area-inset-bottom, 0px));
  border-top: 1px solid var(--line);
  text-align: center;
  color: var(--muted);
  font-size: 14px;
  background: #FFFFFF;
  font-family: 'Inter', -apple-system, system-ui, sans-serif;
  line-height: 1.5;
}

.site-footer p {
  margin: 0;
}

@media (max-width: 800px) {
  :root {
    --header-height: 56px;
  }

  .site-header__bar {
    padding: 8px 0;
  }

  .site-header__bar .wrap {
    grid-template-columns: 1fr;
    row-gap: 8px;
    justify-items: center;
  }

  .site-header__utilities {
    grid-column: auto;
    justify-self: center;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
  }

  .site-primary-nav {
    position: static;
    transform: none;
    grid-column: auto;
    justify-self: center;
    width: min(100%, 360px);
    gap: 6px;
    font-size: 13px;
  }

  .site-primary-nav a {
    flex: 1 1 0;
    min-height: 44px;
    padding: 0 10px;
  }

  .nav-links--edge {
    grid-column: auto;
    justify-self: center;
  }

  .site-settings-button {
    min-height: 42px;
  }

  .site-mode-tabs {
    min-height: 52px;
    padding-inline: 20px;
  }

  .site-mode-tabs .tool-mode-tab {
    min-height: 52px;
    font-size: 15px;
  }

  .site-settings-menu {
    right: 50%;
    transform: translateX(50%);
  }

  .wrap {
    padding: 0 20px;
  }
}

@media (max-width: 600px) {
  .site-mode-tabs {
    min-height: 48px;
    padding-inline: 12px;
  }

  .site-mode-tabs .tool-mode-tab {
    min-height: 48px;
    padding-inline: 4px;
    font-size: 14px;
  }
}

@media (max-width: 360px) {
  .site-mode-tabs {
    min-height: 44px;
    padding-inline: 8px;
  }

  .site-mode-tabs .tool-mode-tab {
    min-height: 44px;
    padding-inline: 2px;
    font-size: 12px;
  }
}