.app-shell {
  position: relative;
  width: var(--phone-width);
  max-width: 430px;
  height: var(--phone-height);
  max-height: 844px;
  overflow: hidden;
  border-radius: var(--radius-phone);
  background: var(--surface);
  box-shadow: var(--shadow-phone);
}

.app-shell.is-dark {
  background: linear-gradient(180deg, #0c1424 0%, #101a2c 100%);
  color: var(--text-inverse);
}

.app-shell::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: inherit;
}

.phone-frame {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding-top: var(--safe-top);
}

.screen-header,
.screen-content,
.bottom-nav,
.status-bar {
  padding-left: var(--space-5);
  padding-right: var(--space-5);
}

.status-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: 24px;
  padding-bottom: var(--space-2);
  font-size: 11px;
  font-weight: 700;
}

.status-meta {
  display: flex;
  align-items: center;
  gap: 8px;
}

.screen-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding-top: var(--space-2);
  padding-bottom: var(--space-4);
}

.screen-content {
  flex: 1;
  overflow-y: auto;
  padding-bottom: calc(var(--space-8) + var(--safe-bottom));
  scrollbar-width: none;
}

.screen-content::-webkit-scrollbar {
  display: none;
}

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

.screen-stack.tight {
  gap: var(--space-3);
}

.screen-stack.spacious {
  gap: var(--space-5);
}

.bottom-nav {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--space-2);
  padding-top: var(--space-3);
  padding-bottom: calc(var(--space-3) + var(--safe-bottom));
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(18px);
  border-top: 1px solid rgba(16, 19, 26, 0.08);
}

.app-shell.is-dark .bottom-nav {
  background: rgba(12, 20, 36, 0.92);
  border-top-color: rgba(255, 255, 255, 0.08);
}

.screen-footer {
  position: sticky;
  bottom: 0;
  padding-top: var(--space-3);
  background: linear-gradient(180deg, rgba(255,255,255,0) 0%, rgba(255,255,255,0.96) 20%);
}

.app-shell.is-dark .screen-footer {
  background: linear-gradient(180deg, rgba(12,20,36,0) 0%, rgba(12,20,36,0.95) 20%);
}

@media (max-width: 520px) {
  body.prototype-body {
    padding: 0;
  }

  .app-shell {
    width: 100vw;
    max-width: none;
    height: 100dvh;
    max-height: none;
    border-radius: 0;
    box-shadow: none;
  }

  .app-shell::before {
    border-radius: 0;
    border: 0;
  }
}