/* pond Physics Experiment - Calm Water Aesthetic */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  overflow: hidden;
  font-family: "Open Sans", sans-serif;
}

/* container fills viewport with water gradient */
#pond-container {
  position: relative;
  width: 100vw;
  height: 100vh;
  background: linear-gradient(
    180deg,
    #1a3a4a 0%,
    #2d5a6b 30%,
    #3d7a8b 60%,
    #4a9aab 100%
  );
  overflow: hidden;
  cursor: default;
}

/* input area - floating at top center */
#input-area {
  position: absolute;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 100;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

#text-input {
  width: 400px;
  max-width: 90vw;
  height: 80px;
  padding: 12px;
  font-family: "Open Sans", sans-serif;
  font-size: 16px;
  border: none;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  resize: none;
}

#text-input:focus {
  outline: none;
  box-shadow: 0 4px 25px rgba(0, 0, 0, 0.4);
}

#text-input::placeholder {
  color: #6a8a9a;
}

#drop-button {
  padding: 10px 24px;
  font-family: "Montserrat", sans-serif;
  font-size: 14px;
  font-weight: 600;
  /* text-transform: uppercase; */
  letter-spacing: 1px;
  color: #1a3a4a;
  background: rgba(255, 255, 255, 0.85);
  border: none;
  border-radius: 20px;
  cursor: pointer;
  transition: all 0.2s ease;
}

#drop-button:hover {
  background: rgba(255, 255, 255, 1);
  transform: scale(1.05);
}

#drop-button:active {
  transform: scale(0.98);
}


/* pond surface where words float */
#pond-surface {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
}

/* water surface effect overlay */
#water-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  background:
    radial-gradient(ellipse at 30% 20%, rgba(255,255,255,0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 70% 60%, rgba(255,255,255,0.04) 0%, transparent 40%);
}

/* word styling */
.pond-word {
  position: absolute;
  font-family: "Open Sans", Georgia, serif;
  font-size: 20px;
  color: #e8f4f8;
  text-shadow:
    0 0 10px rgba(255, 255, 255, 0.3),
    0 2px 4px rgba(0, 0, 0, 0.3);
  padding: 6px 10px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 4px;
  cursor: grab;
  user-select: none;
  will-change: transform;
  transition: background 0.2s ease;
  pointer-events: auto;
  z-index: 1;
}

.pond-word:hover {
  background: rgba(255, 255, 255, 0.2);
}

.pond-word.dragging {
  cursor: grabbing;
  background: rgba(255, 255, 255, 0.25);
  z-index: 1000;
}

/* lilypad styling */
.lilypad {
  position: absolute;
  padding: 8px;  /* room for shadow to render outside the visual shape */
  cursor: grab;
  user-select: none;
  will-change: transform;
  pointer-events: auto;
  /* drop-shadow on parent follows the clipped child's shape */
  filter: drop-shadow(0 0 4px rgba(0, 0, 0, 0.3));
  transition: filter 0.2s ease;
  z-index: 1;
}

/* visual lilypad shape rendered via pseudo-element */
.lilypad::before {
  content: "";
  display: block;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background-color: var(--lilypad-color);
  /* pacman-style notch (~33% of circle missing) */
  clip-path: polygon(
    50% 50%,
    33% 0%,
    0% 0%,
    0% 100%,
    100% 100%,
    100% 0%,
    67% 0%,
    50% 50%
  );
}

.lilypad:hover {
  filter: drop-shadow(0 0 8px rgba(0, 0, 0, 0.4));
}

.lilypad.dragging {
  cursor: grabbing;
  z-index: 1000;
  filter: drop-shadow(0 0 12px rgba(0, 0, 0, 0.5));
}

/* flower on lilypad - simple two-circle design */
.lilypad-flower {
  position: absolute;
  top: 50%;
  left: 50%;
  /* Adjust for 8px padding: 50% of visual lilypad = (50% of padded container) - 8px */
  width: calc(50% - 8px);
  height: calc(50% - 8px);
  transform: translate(-50%, -50%);
  pointer-events: none;
  background: var(--petal-color);
  border-radius: 50%;
  box-shadow: inset 0 1px 4px rgba(0, 0, 0, 0.15);
}

/* yellow center on lilypad flower */
.lilypad-flower::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 50%;
  height: 50%;
  /* background: #FFB955; */
  background: #F5DE91;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.2);
}

/* ripple effect for disturbances */
.pond-ripple {
  position: absolute;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.5);
  pointer-events: none;
  animation: ripple-expand 1s ease-out forwards;
  z-index: 0;
}

@keyframes ripple-expand {
  0% {
    transform: scale(0.5);
    opacity: 0.6;
  }
  100% {
    transform: scale(3);
    opacity: 0;
  }
}

/* navigation link */
#back-link {
  position: absolute;
  top: 20px;
  left: 20px;
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  font-family: "Open Sans", sans-serif;
  font-size: 14px;
  z-index: 100;
  transition: color 0.2s ease;
}

#back-link:hover {
  color: rgba(255, 255, 255, 1);
}

/* ensure UI elements handle touch natively (not captured by Matter.js) */
#input-area,
#clear-button,
#lilypad-button,
#audio-button,
#back-link {
  touch-action: auto;
}

/* bottom buttons */
#clear-button,
#lilypad-button,
#audio-button {
  position: absolute;
  bottom: 20px;
  padding: 8px 16px;
  font-family: "Open Sans", sans-serif;
  font-size: 12px;
  color: white;
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 15px;
  cursor: pointer;
  transition: all 0.2s ease;
}

#clear-button {
  left: 20px;
}

#lilypad-button {
  left: 50%;
  transform: translateX(-50%);
  background: rgba(45, 90, 39, 0.5);
  border-color: rgba(93, 186, 93, 0.5);
}

#audio-button {
  right: 20px;
}

#clear-button:hover,
#lilypad-button:hover,
#audio-button:hover {
  background: rgba(0, 0, 0, 0.5);
  border-color: rgba(255, 255, 255, 0.5);
}

#lilypad-button:hover {
  background: rgba(45, 90, 39, 0.7);
  border-color: rgba(93, 186, 93, 0.8);
}

#audio-button.enabled {
  background: rgba(74, 154, 171, 0.6);
  border-color: rgba(255, 255, 255, 0.5);
}

/* responsive adjustments */
@media (max-width: 500px) {
  #text-input {
    width: 90vw;
    height: 60px;
    font-size: 14px;
  }

  #drop-button {
    padding: 8px 20px;
    font-size: 12px;
  }

  .pond-word {
    font-size: 16px;
    padding: 4px 8px;
  }

  #input-area {
    top: 10px;
  }

  #clear-button,
  #lilypad-button,
  #audio-button {
    bottom: 80px;
  }
}