#clock {
      display: flex;
      justify-content: center; /* horizontal centering */
      align-items: center;     /* vertical centering */
      width: 100%;
      height: 98vh;           /* make parent full height of viewport */

    }
    #clock svg {
      width: calc(((100% + (7% * 3)) / 6) - 1%); /* 6 across; plus offset to match margin changes*/
      stroke-width: 80;
      stroke: blue;
      fill: none;
    }
    #clock svg:nth-child(3n -1) {
      margin-left: -7%;
    }
    #clock svg:nth-child(3n) {
      margin-left: -2%;
      margin-right: -15%;
    }
    #settings {
      position: fixed;
      bottom: 5%;
      right: 5%;
      width: 5%;
      height: 5%;
      min-width: 44px;
      min-height: 44px;
      max-width: 200px;
      max-height: 200px;
    }
    .hidden {
      display: none;
    }
    /* smooth show/hide for the settings button */
#settings {
  transition: opacity 1000ms ease, transform 1000ms ease;
  will-change: opacity, transform;
  cursor: pointer;
  outline: none;
}

#settings.is-hidden {
  opacity: 0;
  transform: rotate(360deg);
  pointer-events: none; /* don’t trap taps/clicks while hidden */
}

/* respect users who prefer reduced motion */
@media (prefers-reduced-motion: reduce) {
  #settings {
    transition: opacity 1ms linear;
  }
  #settings.is-hidden {
    transform: none;
  }
}
#settings:focus { outline: 2px solid currentColor; outline-offset: 2px; }

/* Modal root: hidden by [hidden] attribute by default */
.modal[hidden] { display: none; }

.modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
}

.modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(2px);
}

.modal__content {
  position: relative;
  max-width: 520px;
  width: 92vw;
  margin: 10vh auto 0;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
  padding: 1rem 1.25rem 1.25rem;
  animation: modal-in 160ms ease-out;
}

@keyframes modal-in {
  from { transform: translateY(10px); opacity: 0; }
  to   { transform: translateY(0); opacity: 1; }
}

.modal__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .5rem;
  margin-bottom: .75rem;
}

.modal__close {
  border: none;
  background: transparent;
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
}

.modal__body {
  display: grid;
  gap: .75rem;
}

.modal__body label {
  font-size: .9rem;
  color: #333;
}