.app-shell {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  height: 100dvh;
  padding-top: var(--safe-top);
  overflow: hidden;
}

.topbar {
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  min-height: var(--topbar-height);
  padding: 0.48rem max(0.8rem, env(safe-area-inset-left)) 0.44rem max(0.8rem, env(safe-area-inset-right));
  background: rgba(5, 7, 10, 0.92);
  border-bottom: 1px solid rgba(83, 96, 109, 0.36);
  backdrop-filter: blur(16px);
}

.brand-block {
  display: flex;
  align-items: center;
  min-width: 0;
  gap: 0.6rem;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  flex: 0 0 auto;
  border: 1px solid var(--color-border-strong);
  border-radius: 50%;
  background: conic-gradient(from 215deg, var(--color-red) 0 17%, var(--color-green) 17% 82%, var(--color-amber) 82% 88%, var(--color-red) 88% 100%);
  box-shadow: 0 0 20px rgba(82, 255, 104, 0.16);
}

.brand-mark span {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #05070a;
  box-shadow: inset 0 0 0 2px rgba(242, 246, 248, 0.18);
}

.brand-title {
  font-size: 0.98rem;
  font-weight: 820;
  line-height: 1.05;
  white-space: nowrap;
}

.brand-subtitle {
  display: flex;
  align-items: center;
  gap: 0.32rem;
  min-width: 0;
  margin-top: 0.13rem;
  color: var(--color-muted);
  font-size: 0.68rem;
  font-weight: 760;
  text-transform: uppercase;
}

.top-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex: 0 0 auto;
}

.main-surface {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  width: min(100%, 1180px);
  min-height: 0;
  margin: 0 auto;
  overflow: hidden;
  padding: 0.48rem max(0.55rem, env(safe-area-inset-right)) 0.48rem max(0.55rem, env(safe-area-inset-left));
}

.tab-panel {
  display: none;
  min-height: 0;
  overflow: hidden;
}

.tab-panel.is-active {
  display: grid;
}

.engine-panel,
.motion-panel,
.device-panel {
  display: grid;
  min-height: 0;
  height: 100%;
  gap: 0.5rem;
  overflow: hidden;
}

.engine-panel {
  grid-template-rows: minmax(0, 31fr) minmax(0, 59fr) auto;
}

.motion-panel {
  grid-template-rows: minmax(0, 40fr) minmax(0, 60fr);
}

.device-panel {
  grid-template-rows: minmax(0, 47fr) minmax(0, 53fr);
}

.tabbar {
  z-index: 30;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  min-height: calc(var(--tabbar-height) + var(--safe-bottom));
  padding: 0.4rem max(0.55rem, env(safe-area-inset-right)) calc(0.42rem + var(--safe-bottom)) max(0.55rem, env(safe-area-inset-left));
  background: rgba(5, 7, 10, 0.94);
  border-top: 1px solid rgba(83, 96, 109, 0.46);
  backdrop-filter: blur(18px);
}

@media (min-width: 780px) {
  .main-surface {
    padding: 0.7rem 0.9rem;
  }

  .engine-panel {
    grid-template-columns: minmax(350px, 0.75fr) minmax(0, 1.25fr);
    grid-template-rows: minmax(0, 1fr) auto;
  }

  .rpm-shell {
    grid-row: 1 / 3;
  }

  .motion-panel {
    grid-template-columns: minmax(320px, 0.8fr) minmax(0, 1.2fr);
    grid-template-rows: minmax(0, 1fr);
  }

  .device-panel {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    grid-template-rows: minmax(0, 1fr);
  }

  .tabbar {
    width: min(420px, calc(100% - 2rem));
    min-height: auto;
    margin: 0 auto 1rem;
    border: 1px solid rgba(83, 96, 109, 0.58);
    border-radius: 999px;
    box-shadow: var(--shadow-panel);
  }
}

@media (max-height: 720px) {
  :root {
    --topbar-height: 50px;
    --tabbar-height: 56px;
  }

  .main-surface {
    padding-top: 0.36rem;
    padding-bottom: 0.36rem;
  }

  .engine-panel,
  .motion-panel,
  .device-panel {
    gap: 0.42rem;
  }
}