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

:root {
  --bg:        #ffffff;
  --fg:        #0d0d0d;
  --white:     #0d0d0d;
  --dim:       rgba(13, 13, 13, 0.45);
  --faint:     rgba(13, 13, 13, 0.22);
  --ghost:     rgba(13, 13, 13, 0.13);
  --rule:      rgba(13, 13, 13, 0.13);

  --font-pixel: 'OffBit', 'VT323', 'Courier New', monospace;
  --font-sans:  'Inter', 'DM Sans', 'Helvetica Neue', Arial, sans-serif;
  --font-mono:  'Share Tech Mono', 'Courier New', monospace;
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  /* Near-black horizon gradient - canvas renders alpha:true over this */
  background: #ffffff;
  color: var(--white);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  cursor: crosshair;
  touch-action: none;     /* prevent mobile scroll/zoom on canvas */
  overscroll-behavior: none;
  -webkit-overflow-scrolling: auto;
  overflow: hidden;
}

body:active {
  cursor: crosshair;
}

/* Custom pointer for interactive elements - thin outline arrow matching crosshair aesthetic */
#side-menu button,
#gizmo {
  cursor: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='22' viewBox='0 0 16 22'%3E%3Cpath d='M1 1 L1 17 L5 13 L9 20 L11 19 L7 12 L13 12 Z' fill='black' stroke='white' stroke-width='1.2'/%3E%3C/svg%3E") 1 1, pointer;
}

#spline-canvas {
  display: block;
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}

#canvas {
  display: block;
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  pointer-events: auto;
  touch-action: none;
}


/* -- Top-left panel -------------------------------- */

#panel-tl {
  position: fixed;
  top: 2rem;
  left: 2.2rem;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  pointer-events: none;
  z-index: 10;
  mix-blend-mode: difference;
}

#wordmark {
  font-family: var(--font-pixel);
  font-size: clamp(1rem, 1.4vw, 1.15rem);
  font-weight: 400;
  letter-spacing: 0.28em;
  color: white;
  text-transform: uppercase;
  line-height: 1;
}

#tagline {
  font-family: var(--font-sans);
  font-size: clamp(0.48rem, 0.65vw, 0.58rem);
  font-weight: 300;
  letter-spacing: 0.22em;
  color: rgba(255, 255, 255, 0.7);
  text-transform: uppercase;
  line-height: 1.5;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}


/* -- Bottom-left: version stamp -------------------- */

#version {
  position: fixed;
  bottom: 2rem;
  left: 2.2rem;
  font-family: var(--font-mono);
  font-size: 0.58rem;
  letter-spacing: 0.14em;
  color: white;
  pointer-events: auto;
  z-index: 10;
  mix-blend-mode: difference;
}

#version a,
#version a:link,
#version a:visited,
#version a:active {
  color: inherit;
  text-decoration: none;
  pointer-events: auto;
  cursor: pointer;
  -webkit-text-fill-color: inherit;
}

#version a:hover {
  text-decoration: underline;
}


/* -- Bottom-centre: viewport rule ------------------ */

#viewport-rule {
  position: fixed;
  bottom: 3.8rem;
  left: 2.2rem;
  right: 2.2rem;
  height: 1px;
  background: var(--rule);
  pointer-events: none;
  z-index: 10;
}


/* -- Bottom-right: control hints ------------------- */

#controls {
  position: fixed;
  bottom: 2rem;
  right: 2.2rem;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.28rem;
  pointer-events: none;
  z-index: 10;
  transition: opacity 1.5s ease;
  mix-blend-mode: difference;
}

#controls span {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.54rem;
  letter-spacing: 0.2em;
  color: white;
  text-transform: uppercase;
}

#controls.hidden {
  opacity: 0;
}


/* -- Responsive ------------------------------------ */

/* -- Touch vs Desktop control hints ---------------- */

.touch-controls {
  display: none;  /* hidden on desktop */
}

/* -- Mobile styles --------------------------------- */

@media (max-width: 768px) {
  #panel-tl {
    top: 1.2rem;
    left: 1.2rem;
    gap: 0.35rem;
  }

  #wordmark {
    font-size: clamp(0.85rem, 4vw, 1rem) !important;
  }

  #tagline {
    font-size: clamp(0.3rem, 1.5vw, 0.4rem) !important;
  }

  #version {
    bottom: 1.2rem;
    left: 1.2rem;
  }

  .desktop-controls {
    display: none !important;  /* hide mouse hints on mobile */
  }

  .touch-controls {
    display: flex !important;  /* show touch hints */
    position: fixed;
    bottom: 1.2rem;
    right: 1.2rem;
    flex-direction: column;
    align-items: flex-end;
    gap: 0.28rem;
    pointer-events: none;
    z-index: 10;
    mix-blend-mode: difference;
  }

  .touch-controls span {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.48rem;
    letter-spacing: 0.2em;
    color: white;
    text-transform: uppercase;
  }

  #side-menu {
    right: 1.2rem;
  }

  #side-menu button {
    font-size: 0.5rem;
    padding: 0.45rem 0;
    width: 5.5rem;
  }

  #viewport-rule {
    bottom: 2.8rem;
    left: 1.2rem;
    right: 1.2rem;
  }

  /* Hide gizmo on mobile - too small for touch */
  #gizmo {
    display: none !important;
  }

  /* Hide desktop side menu on mobile */
  #side-menu {
    display: none !important;
  }

  /* Show mobile hamburger menu + bottom bar */
  #mobile-menu {
    display: flex !important;
  }

  #mobile-bar {
    display: flex !important;
  }



  /* Version stamp stays at bottom */
  #version {
    bottom: 1.2rem !important;
    left: 1.2rem;
  }



  /* Header above everything */
  #panel-tl {
    top: 1rem !important;
  }

  /* Push hamburger below header */
  #mobile-menu {
    top: 3.5rem !important;
  }
}

/* -- Mobile hamburger menu ------------------------- */

#mobile-menu {
  display: none;  /* hidden on desktop */
  position: fixed;
  top: 1.2rem;
  right: 1.2rem;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.4rem;
  z-index: 25;
  mix-blend-mode: difference;
}

#mobile-burger {
  background: transparent;
  border: 1px solid white;
  color: white;
  font-family: 'Share Tech Mono', 'Courier New', monospace;
  font-size: 1.1rem;
  width: 2.4rem;
  height: 2.4rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  line-height: 1;
}

#mobile-menu-items {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.35rem;
  transition: opacity 0.25s ease, transform 0.25s ease;
}

#mobile-menu-items.collapsed {
  opacity: 0;
  transform: translateY(-0.5rem);
  pointer-events: none;
}

#mobile-menu-items button {
  background: transparent;
  border: 1px solid white;
  color: white;
  font-family: 'Share Tech Mono', 'Courier New', monospace;
  font-size: 0.5rem;
  letter-spacing: 0.3em;
  padding: 0.45rem 0;
  width: 5.5rem;
  text-align: center;
  cursor: pointer;
}

/* -- Mobile bottom bar ---------------------------- */

#mobile-bar {
  display: none;
  position: fixed;
  bottom: 2.8rem;
  left: 1.2rem;
  flex-direction: row;
  gap: 0.4rem;
  z-index: 25;
  mix-blend-mode: difference;
}

#mobile-bar button {
  background: transparent;
  border: 1px solid white;
  color: white;
  font-family: 'Share Tech Mono', 'Courier New', monospace;
  font-size: 0.5rem;
  letter-spacing: 0.3em;
  padding: 0.45rem 0;
  cursor: pointer;
  width: 5.5rem;
  text-align: center;
}

#mobile-home-btn.hidden, #mobile-dd-home.hidden {
  opacity: 0;
  pointer-events: none;
}

@media (max-width: 380px) {
  #panel-tl {
    top: 0.8rem;
    left: 0.8rem;
  }

  #tagline {
    display: none;  /* hide tagline on very small screens */
  }
}

/* -- Home button ------------------------------------------- */
#side-menu {
  position: fixed;
  top: 50%;
  right: 2rem;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  z-index: 20;
  mix-blend-mode: difference;
}

#side-menu button {
  background: transparent;
  border: 1px solid white;
  color: white;
  font-family: 'Share Tech Mono', 'Courier New', monospace;
  font-size: 0.55rem;
  letter-spacing: 0.3em;
  padding: 0.5rem 0.8rem;
  cursor: pointer;
  transition: opacity 0.4s ease;
  width: 5.5rem;
  text-align: center;
}

#home-btn.hidden {
  opacity: 0;
  pointer-events: none;
}