.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.login-form {
  width: 320px;
  padding: var(--space-6);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.login-form h1 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-5);
}

.shell {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  grid-template-rows: auto 1fr;
  grid-template-areas:
    'header header'
    'nav main';
  min-height: 100vh;
}

.shell-header {
  grid-area: header;
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: 0 var(--space-5);
  min-height: 64px;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.shell-brand {
  display: flex;
  min-width: 0;
  flex-direction: column;
  gap: 2px;
}

.shell-brand-name {
  font-weight: 600;
  font-size: var(--font-size-lg);
  line-height: 1.2;
}

.shell-date {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  line-height: 1.2;
}

.shell-menu-button {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-text);
  cursor: pointer;
  font: inherit;
  font-size: var(--font-size-xl);
}

.shell-header-spacer {
  flex: 1;
}

.shell-nav {
  grid-area: nav;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-4);
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
}

.shell-nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  text-decoration: none;
}

.shell-nav-link:hover {
  background: var(--color-bg);
}

.shell-nav-link.active {
  background: var(--color-accent);
  color: #fff;
}

.shell-nav-icon {
  width: 18px;
  height: 18px;
  flex: 0 0 auto;
}

.shell-main {
  grid-area: main;
  padding: var(--space-5);
  overflow: auto;
}

.shell-nav-backdrop {
  display: none;
}

@media (max-width: 768px) {
  .login-page {
    padding: var(--space-4);
  }

  .login-form {
    width: 100%;
    max-width: 360px;
    padding: var(--space-5);
  }

  .shell {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas:
      'header'
      'main';
  }

  .shell-header {
    min-width: 0;
    padding-right: max(var(--space-3), env(safe-area-inset-right));
    padding-left: max(var(--space-3), env(safe-area-inset-left));
    gap: var(--space-2);
  }

  .shell-brand {
    flex: 1 1 auto;
  }

  .shell-brand-name {
    font-size: var(--font-size-base);
  }

  .shell-date {
    font-size: 12px;
  }

  .shell-header .btn-ghost {
    flex: 0 0 auto;
    padding-right: var(--space-2);
    padding-left: var(--space-2);
  }

  .shell-menu-button {
    display: inline-flex;
    flex: 0 0 auto;
  }

  .shell-header-spacer {
    display: none;
  }

  .shell-nav {
    position: fixed;
    inset: 0 auto 0 0;
    z-index: 50;
    width: min(280px, calc(100vw - 48px));
    padding-top: max(var(--space-4), env(safe-area-inset-top));
    padding-bottom: max(var(--space-4), env(safe-area-inset-bottom));
    padding-left: max(var(--space-4), env(safe-area-inset-left));
    overflow-y: auto;
    border-right: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    transform: translateX(-105%);
    visibility: hidden;
    transition: transform 180ms ease, visibility 180ms ease;
  }

  .shell--nav-open .shell-nav {
    transform: translateX(0);
    visibility: visible;
  }

  .shell-nav-backdrop {
    position: fixed;
    inset: 0;
    z-index: 40;
    display: block;
    visibility: hidden;
    background: rgba(16, 24, 40, 0.4);
    opacity: 0;
    transition: opacity 180ms ease, visibility 180ms ease;
  }

  .shell--nav-open .shell-nav-backdrop {
    visibility: visible;
    opacity: 1;
  }

  .shell-nav-link {
    min-height: 44px;
    display: flex;
    align-items: center;
  }

  .shell-main {
    min-width: 0;
    padding-top: var(--space-4);
    padding-right: max(var(--space-3), env(safe-area-inset-right));
    padding-bottom: max(var(--space-5), env(safe-area-inset-bottom));
    padding-left: max(var(--space-3), env(safe-area-inset-left));
    overflow: visible;
  }
}

@media (prefers-reduced-motion: reduce) {
  .shell-nav,
  .shell-nav-backdrop {
    transition: none;
  }
}