.app-root {
  min-height: 100vh;
}

.login-screen {
  display: grid;
  min-height: 100vh;
  overflow-x: hidden;
  place-items: center;
  padding: var(--space-5);
}

.login-panel {
  width: min(calc(100vw - (var(--space-5) * 2)), 420px);
  max-width: calc(100vw - (var(--space-5) * 2));
}

.shell {
  min-height: 100vh;
  padding-top: var(--header-height);
}

.topbar {
  position: fixed;
  top: 0;
  right: 0;
  left: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: var(--space-4);
  align-items: center;
  min-height: var(--header-height);
  padding: 0 var(--space-6);
  border-bottom: 1px solid rgba(41, 65, 91, 0.86);
  background: rgba(6, 23, 43, 0.92);
  backdrop-filter: blur(18px);
}

.nav-scroll-shell {
  position: relative;
  min-width: 0;
}

.main-nav {
  display: flex;
  gap: var(--space-2);
  align-items: center;
  min-width: 0;
  overflow-x: auto;
  scrollbar-width: none;
}

.nav-scroll-shell::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 28px;
  pointer-events: none;
  background: linear-gradient(90deg, rgba(6, 23, 43, 0), rgba(6, 23, 43, 0.92));
}

.main-nav::-webkit-scrollbar,
.shelf-track::-webkit-scrollbar {
  display: none;
}

.header-actions {
  display: flex;
  gap: var(--space-3);
  align-items: center;
}

.shell-body {
  width: min(100%, 1440px);
  margin: 0 auto;
  padding: var(--space-3) var(--space-5) var(--space-5);
}

.content-stack {
  display: grid;
  gap: var(--space-3);
}

.surface-grid {
  display: grid;
  gap: var(--space-4);
}

.surface-grid-with-side {
  grid-template-columns: minmax(0, 1fr) minmax(280px, 340px);
}

.embedded-shell {
  display: grid;
  grid-template-rows: var(--header-height) 1fr;
  min-height: 100vh;
}

.embedded-topbar {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: var(--space-4);
  align-items: center;
  padding: 0 var(--space-6);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-header);
}

.embedded-stage {
  display: grid;
  min-height: calc(100vh - var(--header-height));
  padding: var(--space-4);
}

@media (max-width: 820px) {
  :root {
    --header-height: 62px;
  }

  .login-panel {
    width: calc(100vw - (var(--space-4) * 2));
    max-width: calc(100vw - (var(--space-4) * 2));
  }

  .topbar {
    grid-template-columns: auto 1fr auto;
    gap: var(--space-2);
    padding: 0 var(--space-3);
  }

  .brand-mark .brand-word {
    display: none;
  }

  .main-nav {
    order: 3;
    grid-column: 1 / -1;
    padding-bottom: var(--space-3);
  }

  .nav-scroll-shell {
    order: 3;
    grid-column: 1 / -1;
    min-width: 0;
  }

  .shell {
    padding-top: 112px;
  }

  .topbar {
    min-height: 112px;
    align-content: center;
  }

  .header-actions {
    gap: var(--space-2);
    min-width: 0;
  }

  .shell-body {
    padding: var(--space-3);
  }

  .surface-grid-with-side {
    grid-template-columns: 1fr;
  }

  .embedded-topbar {
    grid-template-columns: 1fr auto;
    min-height: 58px;
    padding: 0 var(--space-3);
  }

  .embedded-topbar .brand-mark {
    display: none;
  }

  .embedded-stage {
    min-height: calc(100vh - 58px);
    padding: var(--space-2);
  }
}