.icon-btn {
  position: relative;
  width: 34px;
  height: 34px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius);
  color: var(--text-muted);
  cursor: pointer;
  padding: 0;
  transition:
    color var(--dur-fast) var(--ease-out),
    background-color var(--dur-fast) var(--ease-out),
    border-color var(--dur-fast) var(--ease-out),
    transform var(--dur-fast) var(--ease-out);
}

.icon-btn:hover {
  color: var(--text);
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  border-color: var(--glass-border);
}

.icon-btn:active {
  background: var(--bg-elev);
  transform: scale(0.96);
}

.icon-btn.is-active {
  color: var(--text);
  background: var(--surface-2);
  border-color: var(--border);
}

#refresh.is-busy svg {
  animation: spin 0.9s linear infinite;
}

#refresh.is-error {
  color: var(--danger, #c26d6d);
}

.playlist-track-btn,
.copy-btn,
.quota-key-form button[type="submit"],
.notes-compose button[type="submit"],
.playlist-form button[type="submit"],
.owned-s4a-connect {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  border-radius: var(--radius);
  font: inherit;
  font-size: 12px;
  font-weight: var(--fw-semi);
  cursor: pointer;
  box-shadow: inset 0 1px 0 var(--glass-highlight);
  transition:
    background-color var(--dur-fast) var(--ease-out),
    border-color var(--dur-fast) var(--ease-out),
    color var(--dur-fast) var(--ease-out),
    opacity var(--dur-fast) var(--ease-out),
    transform var(--dur-fast) var(--ease-out);
}

.playlist-track-btn:hover:not(:disabled),

.copy-btn:hover,
.quota-key-form button[type="submit"]:hover,
.notes-compose button[type="submit"]:hover:not(:disabled),
.playlist-form button[type="submit"]:hover:not(:disabled),
.owned-s4a-connect:hover:not(:disabled) {
  background: var(--bg-elev);
  border-color: var(--focus);
  color: var(--text);
}

.playlist-track-btn:active:not(:disabled),

.copy-btn:active,
.quota-key-form button[type="submit"]:active:not(:disabled),
.notes-compose button[type="submit"]:active:not(:disabled),
.playlist-form button[type="submit"]:active:not(:disabled),
.owned-s4a-connect:active:not(:disabled) {
  transform: scale(0.98);
}

.playlist-track-btn:disabled,
.owned-s4a-connect:disabled,
.notes-compose button[type="submit"]:disabled,
.playlist-form button[type="submit"]:disabled {
  opacity: 0.45;
  cursor: default;
}

.playlist-track-btn,
.owned-s4a-connect {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 32px;
  padding: 0 12px;
  position: relative;
}

.playlist-track-btn.is-tracked {
  color: var(--text-muted);
}

.copy-btn {
  flex-shrink: 0;
  padding: 5px 9px;
  font-size: 11px;
  color: var(--text-muted);
  background: transparent;
}

.playlist-form button[type="submit"] {
  min-width: 64px;
  height: auto;
  padding: 0 12px;
  font-size: 11px;
  font-weight: var(--fw-semi);
}

.playlist-filter button {
  margin: 0 0 -1px;
  border: 0;
  border-bottom: 2px solid transparent;
  background: transparent;
  color: var(--text-muted);
  font: inherit;
  font-size: 12px;
  font-weight: var(--fw-medium);
  padding: 4px 10px 8px;
  border-radius: 0;
  cursor: pointer;
  transition:
    color var(--dur-fast) var(--ease-out),
    border-color var(--dur-fast) var(--ease-out);
}

.playlist-filter button:hover {
  color: var(--text);
  background: transparent;
}

.playlist-filter button.is-active {
  color: var(--text);
  background: transparent;
  border-bottom-color: var(--accent);
}

.auth-wrap button[type="submit"],
.done-link {
  background: #fafafa;
  color: #18181b;
  border: 1px solid color-mix(in srgb, var(--accent) 70%, transparent);
  border-radius: var(--radius);
  padding: 11px 12px;
  font-size: 12px;
  font-weight: var(--fw-semi);
  font-family: inherit;
  letter-spacing: 0.04em;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  transition:
    background-color var(--dur-fast) var(--ease-out),
    opacity var(--dur-fast) var(--ease-out),
    transform var(--dur-fast) var(--ease-out);
}

.done-link {
  display: inline-flex;
  text-decoration: none;
  width: auto;
  min-width: 120px;
}

.auth-wrap button[type="submit"]:hover,
.done-link:hover {
  background: #e4e4e7;
}

.auth-wrap button[type="submit"]:active,
.done-link:active {
  transform: scale(0.98);
}

.auth-wrap button[type="submit"]:disabled {
  opacity: 0.38;
  cursor: default;
}

.grade-badge {
  border: 1px solid currentColor;
  background: transparent;
}