/* App shell: sidebar, scrolling content panel, sticky topbar, mobile tab bar. */

.app {
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr);
  grid-template-rows: minmax(0, 1fr) auto;
  grid-template-areas:
    "sidebar content"
    "player player";
  gap: var(--gap);
  height: 100dvh;
  padding: var(--gap);
  background: var(--black);
}

/* ---------- Sidebar ---------- */

.sidebar {
  grid-area: sidebar;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  gap: var(--gap);
  min-height: 0;
}

.sidebar-panel {
  padding: 12px 8px;
  border-radius: var(--r-lg);
  background: var(--base);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 12px 14px;
}

.brand-mark {
  width: 40px;
  height: 40px;
  flex: 0 0 auto;
  border-radius: var(--r-lg);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.5);
}

.brand-text {
  min-width: 0;
}

.brand-name {
  color: var(--text);
  font-size: 0.9375rem;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.brand-tag {
  color: var(--subdued);
  font-size: 0.75rem;
}

.nav {
  display: grid;
  gap: 2px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 16px;
  min-height: 44px;
  padding: 0 12px;
  border-radius: var(--r-md);
  color: var(--subdued);
  font-size: 0.9375rem;
  font-weight: 700;
  transition: color var(--dur-2) var(--ease), background var(--dur-2) var(--ease);
}

.nav-item svg {
  width: 24px;
  height: 24px;
  flex: 0 0 auto;
  fill: currentcolor;
}

.nav-item:hover {
  color: var(--text);
}

.nav-item[aria-current="page"] {
  color: var(--text);
  background: var(--elevated-hover);
}

/* ---------- Library panel (top tracks) ---------- */

.library {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  gap: 4px;
  min-height: 0;
  padding: 12px 4px 8px;
  border-radius: var(--r-lg);
  background: var(--base);
}

.library-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 0 12px 8px;
}

.library-title {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--subdued);
  font-size: 0.9375rem;
  font-weight: 700;
  transition: color var(--dur-2) var(--ease);
}

.library-title svg {
  width: 24px;
  height: 24px;
  fill: currentcolor;
}

.library-title:hover {
  color: var(--text);
}

.library-list {
  display: grid;
  align-content: start;
  gap: 2px;
  min-height: 0;
  padding: 0 4px 4px;
  overflow-y: auto;
  overscroll-behavior: contain;
}

.library-row {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 12px;
  align-items: center;
  padding: 6px 8px;
  border-radius: var(--r-md);
  transition: background var(--dur-2) var(--ease);
}

.library-row:hover {
  background: var(--elevated-hover);
}

.library-row .cover,
.library-row .cover-fallback {
  width: 44px;
  height: 44px;
  border-radius: var(--r-sm);
}

.library-copy {
  display: grid;
  gap: 2px;
  min-width: 0;
}

.library-row-title {
  color: var(--text);
  font-size: 0.875rem;
  font-weight: 600;
}

.library-row-meta {
  color: var(--subdued);
  font-size: 0.75rem;
}

.library-empty {
  padding: 10px 12px;
  color: var(--quiet);
  font-size: 0.8125rem;
}

/* ---------- Content panel ---------- */

.content {
  grid-area: content;
  position: relative;
  min-width: 0;
  min-height: 0;
  overflow-y: auto;
  overscroll-behavior-y: contain;
  border-radius: var(--r-lg);
  background: var(--base);
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--accent) 70%, transparent) 0, transparent 320px),
    var(--base);
  transition: background var(--dur-4) var(--ease);
  isolation: isolate;
}

.content::before {
  content: "";
  position: absolute;
  top: 90px;
  right: -120px;
  z-index: -1;
  width: min(42vw, 560px);
  aspect-ratio: 1;
  border: 1px solid color-mix(in srgb, var(--accent-strong) 70%, transparent);
  border-radius: 50%;
  opacity: 0.42;
  box-shadow:
    0 0 0 36px color-mix(in srgb, var(--accent) 18%, transparent),
    0 0 0 88px color-mix(in srgb, var(--accent) 10%, transparent);
  pointer-events: none;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 64px;
  padding: 12px var(--pad-panel);
  background: transparent;
  transition: background var(--dur-2) var(--ease), backdrop-filter var(--dur-2) var(--ease);
}

.topbar.is-stuck {
  background: #0d0d0d;
  background: color-mix(in srgb, var(--accent) 55%, #0d0d0d);
  backdrop-filter: saturate(1.2) blur(18px);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.04);
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: 16px;
  min-width: 0;
}

.history-buttons {
  display: flex;
  gap: 8px;
}

.round-button {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  color: var(--text);
  background: rgba(0, 0, 0, 0.55);
  transition: transform var(--dur-2) var(--ease), opacity var(--dur-2) var(--ease);
}

.round-button svg {
  width: 18px;
  height: 18px;
  fill: currentcolor;
}

.round-button:hover {
  transform: scale(1.06);
}

.round-button:disabled {
  color: var(--quiet);
  cursor: not-allowed;
  transform: none;
}

.topbar-title {
  color: var(--text);
  font-size: 1.125rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  opacity: 0;
  transform: translateY(4px);
  transition: opacity var(--dur-2) var(--ease), transform var(--dur-2) var(--ease);
}

.topbar.is-stuck .topbar-title {
  opacity: 1;
  transform: none;
}

.live-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 32px;
  padding: 0 14px;
  border-radius: var(--r-pill);
  color: var(--text);
  background: rgba(0, 0, 0, 0.55);
  font-size: 0.75rem;
  font-weight: 700;
  white-space: nowrap;
}

.live-pill[data-live="false"] .eq-bars span {
  animation-play-state: paused;
  background: var(--quiet);
}

.view {
  padding: 0 var(--pad-panel) 40px;
}

/* ---------- Mobile tab bar ---------- */

.tabbar {
  display: none;
  grid-area: tabbar;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  padding: 6px 4px calc(4px + env(safe-area-inset-bottom));
  background: linear-gradient(180deg, rgba(0, 0, 0, 0.72), var(--black) 40%);
}

.tab {
  display: grid;
  justify-items: center;
  gap: 3px;
  padding: 6px 0;
  color: var(--quiet);
  font-size: 0.625rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.tab svg {
  width: 24px;
  height: 24px;
  fill: currentcolor;
}

.tab[aria-current="page"] {
  color: var(--text);
}

@media (max-width: 900px) {
  .app {
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: minmax(0, 1fr) auto auto;
    grid-template-areas:
      "content"
      "player"
      "tabbar";
    gap: 0;
    padding: 0;
  }

  .sidebar {
    display: none;
  }

  .tabbar {
    display: grid;
  }

  .content {
    border-radius: 0;
  }

  .topbar {
    min-height: 56px;
    padding: 8px 16px;
  }

  :root {
    --pad-panel: 16px;
  }
}