* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #071824;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

#app {
  position: relative;
  width: 100vw;
  height: 100vh;
}

#aquarium {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}

#hud {
  position: absolute;
  top: 16px;
  left: 20px;
  color: #eaf6ff;
  text-shadow: 0 1px 4px rgba(0,0,0,0.6);
  pointer-events: none;
}

#hud h1 {
  margin: 0;
  font-size: 22px;
  font-weight: 600;
  letter-spacing: 0.3px;
}

.status {
  margin-top: 4px;
  font-size: 13px;
  opacity: 0.85;
}

.status.connected::before {
  content: "● ";
  color: #59e08a;
}

.status.disconnected::before {
  content: "● ";
  color: #e05959;
}

#upload-panel {
  position: absolute;
  bottom: 18px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  max-width: 90vw;
}

.upload-btn {
  background: #1f8fd6;
  color: white;
  /* <button> gets the browser's default border/UA font otherwise, while the
     label-based buttons in this stylesheet have neither - reset both here */
  border: none;
  font-family: inherit;
  padding: 12px 22px;
  border-radius: 30px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(0,0,0,0.35);
  transition: transform 0.15s ease, background 0.15s ease;
  user-select: none;
  text-align: center;
}

.upload-btn:hover {
  background: #2aa3f2;
  transform: translateY(-1px);
}

.upload-btn:active {
  transform: translateY(0px) scale(0.98);
}

#upload-hint {
  color: #cfe8f9;
  font-size: 11.5px;
  text-align: center;
  opacity: 0.8;
  text-shadow: 0 1px 4px rgba(0,0,0,0.6);
}

#upload-hint code {
  background: rgba(255,255,255,0.15);
  padding: 1px 6px;
  border-radius: 4px;
}

#bg-toggle-btn {
  position: absolute;
  top: 16px;
  right: 20px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: none;
  background: rgba(20, 40, 55, 0.75);
  color: #eaf6ff;
  font-size: 20px;
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(0,0,0,0.35);
}

#bg-toggle-btn:hover {
  background: rgba(31, 143, 214, 0.85);
}

#print-toggle-btn {
  position: absolute;
  top: 16px;
  right: 74px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: none;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(20, 40, 55, 0.75);
  color: #eaf6ff;
  font-size: 20px;
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(0,0,0,0.35);
}

#print-toggle-btn svg {
  display: block;
}

#print-toggle-btn:hover {
  background: rgba(31, 143, 214, 0.85);
}

#bg-panel {
  position: absolute;
  top: 68px;
  right: 20px;
  width: 220px;
  background: rgba(15, 32, 45, 0.95);
  border-radius: 14px;
  padding: 14px;
  box-shadow: 0 6px 22px rgba(0,0,0,0.45);
  color: #eaf6ff;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

#bg-panel.hidden {
  opacity: 0;
  transform: translateY(-6px);
  pointer-events: none;
}

#print-panel {
  position: absolute;
  top: 68px;
  right: 20px;
  width: 244px;
  max-height: calc(100vh - 88px);
  overflow-y: auto;
  background: rgba(15, 32, 45, 0.95);
  border-radius: 14px;
  padding: 14px;
  box-shadow: 0 6px 22px rgba(0,0,0,0.45);
  color: #eaf6ff;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

#print-panel .bg-panel-title {
  margin-top: 12px;
}

#print-panel .bg-panel-title:first-child {
  margin-top: 0;
}

#print-panel.hidden {
  opacity: 0;
  transform: translateY(-6px);
  pointer-events: none;
}

#print-panel .upload-btn {
  display: block;
}

#print-gallery {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-bottom: 10px;
}

.print-thumb {
  position: relative;
  height: 58px;
  border: 2px solid transparent;
  border-radius: 8px;
  cursor: pointer;
  /* light backdrop so cut-out PNGs with transparency stay visible */
  background-color: rgba(255, 255, 255, 0.92);
  background-size: contain;
  background-position: center;
  background-repeat: no-repeat;
}

.print-thumb.active {
  border-color: #59e08a;
}

.print-thumb-delete {
  position: absolute;
  top: -6px;
  right: -6px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #c0392b;
  color: white;
  font-size: 13px;
  line-height: 20px;
  text-align: center;
  box-shadow: 0 2px 6px rgba(0,0,0,0.4);
}

#print-panel .upload-btn.print-download {
  margin-top: 10px;
  background: rgba(89, 224, 138, 0.9);
}

/* there is no generic `.hidden` rule in this stylesheet, so state it here */
#print-panel .upload-btn.hidden {
  display: none;
}

#print-panel .upload-btn.print-download:hover {
  background: rgba(89, 224, 138, 1);
}

.print-hint {
  margin-top: 8px;
  font-size: 11px;
  line-height: 1.35;
  color: #cfe8f9;
  opacity: 0.8;
}

.bg-panel-title {
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 10px;
  opacity: 0.9;
}

#bg-presets {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 12px;
}

#bg-presets {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 12px;
}

#bg-gallery {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 16px;
}

.bg-thumb {
  position: relative;
  border: 2px solid transparent;
  border-radius: 8px;
  height: 50px;
  color: white;
  font-size: 11.5px;
  font-weight: 600;
  text-shadow: 0 1px 3px rgba(0,0,0,0.6);
  cursor: pointer;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding-bottom: 4px;
  background-size: cover;
  background-position: center;
  overflow: visible;
}

.bg-thumb.active {
  border-color: #59e08a;
}

.bg-thumb-add {
  background: rgba(255,255,255,0.08);
  border: 2px dashed rgba(255,255,255,0.35);
  align-items: center;
  padding-bottom: 0;
}

.bg-thumb-delete {
  position: absolute;
  top: -6px;
  right: -6px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #c0392b;
  color: white;
  font-size: 13px;
  line-height: 20px;
  text-align: center;
  box-shadow: 0 2px 6px rgba(0,0,0,0.4);
}

#bg-filters {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 12px;
}

.bg-filter-swatch {
  border: 2px solid transparent;
  border-radius: 8px;
  padding: 8px 4px;
  background: rgba(255,255,255,0.08);
  color: #eaf6ff;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
}

.bg-filter-swatch.active {
  border-color: #59e08a;
  background: rgba(89, 224, 138, 0.18);
}

.bg-swatch {
  border: 2px solid transparent;
  border-radius: 8px;
  height: 46px;
  color: white;
  font-size: 11.5px;
  font-weight: 600;
  text-shadow: 0 1px 3px rgba(0,0,0,0.6);
  cursor: pointer;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding-bottom: 4px;
}

.bg-swatch.active {
  border-color: #59e08a;
}

.upload-btn.small {
  width: 100%;
  padding: 9px 12px;
  font-size: 12.5px;
  border-radius: 20px;
}

.upload-btn.install {
  background: rgba(89, 224, 138, 0.9);
  border: none;
  font: inherit;
}

.upload-btn.install:hover {
  background: rgba(89, 224, 138, 1);
}

.upload-btn.install.hidden {
  display: none;
}

#delete-confirm {
  position: fixed;
  z-index: 50;
  background: rgba(15, 20, 28, 0.96);
  color: #eaf6ff;
  padding: 12px 14px;
  border-radius: 12px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.5);
  transition: opacity 0.15s ease, transform 0.15s ease;
  transform: translate(-50%, -100%);
}

#delete-confirm.hidden {
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, -90%);
}

.delete-confirm-text {
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 8px;
  text-align: center;
  white-space: nowrap;
}

.delete-confirm-actions {
  display: flex;
  gap: 8px;
}

.delete-confirm-actions button {
  flex: 1;
  border: none;
  border-radius: 8px;
  padding: 7px 10px;
  font-size: 12.5px;
  font-weight: 600;
  cursor: pointer;
}

#delete-confirm-yes {
  background: #c0392b;
  color: white;
}

#delete-confirm-no {
  background: rgba(255,255,255,0.12);
  color: #eaf6ff;
}

.toast {
  position: absolute;
  top: 70px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(20, 40, 55, 0.92);
  color: #eaf6ff;
  padding: 10px 18px;
  border-radius: 10px;
  font-size: 14px;
  box-shadow: 0 4px 14px rgba(0,0,0,0.4);
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.toast.hidden {
  opacity: 0;
  transform: translateX(-50%) translateY(-8px);
  pointer-events: none;
}