/* ============================================================
   Kinetic Slime · Jelly Soft-body Elastic Simulation Styles
   ============================================================ */

*, *::before, *::after {
  box-sizing: border-box;
  user-select: none;
  -webkit-user-select: none;
  -webkit-tap-highlight-color: transparent;
}

body {
  margin: 0;
  padding: 0;
  width: 100vw;
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
  background: #090a0f;
  color: #ecedee;
  font-family: 'Nunito Sans', -apple-system, sans-serif;
  position: relative;
}

/* Header */
.slime-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 2rem 1rem;
  gap: 1.5rem;
  flex-wrap: wrap;
  pointer-events: none;
}

.slime-header > * {
  pointer-events: auto;
}

.slime-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-left: 5.5rem; /* Space for .back-btn */
}

.brand-icon {
  font-size: 1.6rem;
  filter: drop-shadow(0 2px 10px rgba(0, 255, 136, 0.4));
}

.brand-title {
  margin: 0;
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #ffffff 30%, #38ef7d 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

body[data-theme="plasma"] .brand-title {
  background: linear-gradient(135deg, #ffffff 30%, #c44dff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

body[data-theme="bubblegum"] .brand-title {
  background: linear-gradient(135deg, #ffffff 30%, #ff6b9d 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

body[data-theme="mercury"] .brand-title {
  background: linear-gradient(135deg, #ffffff 30%, #a0aec0 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.slime-controls {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.theme-picker {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  background: rgba(255, 255, 255, 0.06);
  padding: 0.2rem;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(12px);
}

.theme-btn {
  background: transparent;
  border: none;
  font-size: 1.1rem;
  padding: 0.3rem 0.55rem;
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.2s ease;
  line-height: 1;
}

.theme-btn:hover {
  background: rgba(255, 255, 255, 0.12);
  transform: scale(1.1);
}

.theme-btn.active {
  background: rgba(255, 255, 255, 0.22);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
  transform: scale(1.1);
}

.action-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.14);
  color: #ecedee;
  border-radius: 999px;
  padding: 0.45rem 0.9rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  backdrop-filter: blur(12px);
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.action-btn:hover {
  background: rgba(255, 255, 255, 0.16);
  border-color: rgba(255, 255, 255, 0.3);
  transform: translateY(-1px);
}

.action-btn:active {
  transform: translateY(1px);
}

.action-btn.icon-only {
  padding: 0.45rem 0.65rem;
  font-size: 0.95rem;
}

/* Canvas Wrapper */
.canvas-wrap {
  width: 100vw;
  height: 100vh;
  position: absolute;
  inset: 0;
  overflow: hidden;
}

#slimeCanvas {
  display: block;
  width: 100%;
  height: 100%;
  touch-action: none;
  cursor: grab;
}

#slimeCanvas:active {
  cursor: grabbing;
}

/* Hint */
.slime-hint {
  position: fixed;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
  pointer-events: none;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: rgba(255, 255, 255, 0.45);
  padding: 0.4rem 1.1rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 999px;
  backdrop-filter: blur(8px);
  animation: hintPulse 4s ease-in-out infinite;
}

@keyframes hintPulse {
  0%, 100% { opacity: 0.8; }
  50% { opacity: 0.3; }
}

/* Responsive */
@media (max-width: 680px) {
  .slime-header {
    padding: 1rem 1rem 0.5rem;
    gap: 0.75rem;
    justify-content: center;
  }
  .slime-brand {
    margin-left: 0;
    width: 100%;
    justify-content: center;
  }
  .slime-hint {
    bottom: 0.75rem;
    font-size: 0.7rem;
    padding: 0.3rem 0.8rem;
  }
}