.app-shell {
  min-height: 100vh;
  display: flex;
  background: var(--bg-base);
}

.main-shell {
  min-width: 0;
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

.main {
  flex: 1 1 auto;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 24px;
}

.card, .page {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 20px;
  margin-bottom: 16px;
}

.card h2,
.page h1 {
  margin: 0 0 10px;
  font-size: 1.625rem;
}

.card p,
.page p {
  margin: 0 0 10px;
  color: var(--text-secondary);
}

@media (max-width: 920px) {
  .app-shell {
    flex-direction: column;
    width: 100%;
    max-width: 100%;
    overflow-x: hidden;
  }

  .main-shell {
    height: auto;
    min-height: 100vh;
    width: 100%;
    max-width: 100%;
    overflow-x: hidden;
  }

  .main {
    padding: 16px;
    overflow-x: hidden;
    width: 100%;
    max-width: 100%;
    contain: inline-size;
  }
}

@media (max-width: 640px) {
  .main {
    padding: 12px;
    overflow-x: hidden;
  }

  .card, .page {
    border-radius: 12px;
    padding: 14px;
    margin-bottom: 12px;
  }

  .card h2,
  .page h1 {
    font-size: 1.35rem;
  }
}

@media (max-width: 400px) {
  .main {
    padding: 8px;
  }

  .card, .page {
    border-radius: 10px;
    padding: 12px;
    margin-bottom: 10px;
  }
}