@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;500;700&display=swap');

:root {
  --bg-panel: rgba(14, 24, 18, 0.88);
  --bg-subpanel: rgba(20, 34, 25, 0.85);
  --bg-control: rgba(28, 48, 35, 0.9);
  --accent: #4ade80;
  --accent-active: #16a34a;
  --accent-glow: rgba(74, 222, 128, 0.25);
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-faint: #64748b;
  --text-highlight: #86efac;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  user-select: none;
  -webkit-user-select: none;
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background-color: #070d09;
  font-family: 'Roboto', sans-serif;
  color: var(--text-main);
}

#canvas-container {
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  z-index: 1;
  cursor: default;
}

/* Center Crosshair */
.crosshair {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 24px;
  height: 24px;
  transform: translate(-50%, -50%);
  pointer-events: none;
  z-index: 5;
  mix-blend-mode: difference;
}

.crosshair-dot {
  display: none;
}

.crosshair-line {
  position: absolute;
  background: #ffffff;
}

.crosshair-top {
  top: 0;
  left: 11px;
  width: 2px;
  height: 12px;
}

.crosshair-bottom {
  bottom: 0;
  left: 11px;
  width: 2px;
  height: 12px;
}

.crosshair-left {
  left: 0;
  top: 11px;
  width: 12px;
  height: 2px;
}

.crosshair-right {
  right: 0;
  top: 11px;
  width: 12px;
  height: 2px;
}

/* Linear Scale 0 -> 100 Animations */
@keyframes linearZoomIn {
  0% { transform: scale(0); opacity: 1; }
  100% { transform: scale(1); opacity: 1; }
}

@keyframes linearZoomOut {
  0% { transform: scale(1); opacity: 1; }
  100% { transform: scale(0); opacity: 0; }
}

@keyframes modalLinearZoomIn {
  0% { transform: translate(-50%, -50%) scale(0); opacity: 1; }
  100% { transform: translate(-50%, -50%) scale(1); opacity: 1; }
}

@keyframes modalLinearZoomOut {
  0% { transform: translate(-50%, -50%) scale(1); opacity: 1; }
  100% { transform: translate(-50%, -50%) scale(0); opacity: 0; }
}

/* Button Pop-in continuation from 1.5 -> 1.0 */
@keyframes btnPopInFromScale {
  0% {
    transform: scale(1.5);
  }
  100% {
    transform: scale(1.0);
  }
}

/* Glassmorphic Panel */
.glass-panel {
  background: var(--bg-panel);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: none;
  outline: none;
  border-radius: 12px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
  color: var(--text-main);
  z-index: 10;
}

/* Left-Arranged Scrollable Master Sidebar HUD - Canonical iOS Modal Spring */
.left-hud-sidebar {
  position: absolute;
  top: 1rem;
  left: 1rem;
  width: 310px;
  height: calc(100vh - 2rem);
  max-height: calc(100vh - 2rem);
  max-width: calc(100vw - 2rem);
  display: flex;
  flex-direction: column;
  padding: 1.1rem;
  gap: 0.85rem;
  overflow-y: auto;
  overflow-x: hidden;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  scrollbar-color: rgba(74, 222, 128, 0.25) transparent;
  border-radius: 16px !important;
  transform-origin: 0 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}

.left-hud-sidebar::-webkit-scrollbar { width: 4px; }
.left-hud-sidebar::-webkit-scrollbar-button {
  display: none !important;
  width: 0 !important;
  height: 0 !important;
}
.left-hud-sidebar::-webkit-scrollbar-thumb {
  background: rgba(74, 222, 128, 0.3);
  border-radius: 4px;
}
.left-hud-sidebar::-webkit-scrollbar-track {
  background: transparent;
}

/* Inner elements container for staged iOS cross-fading */
.left-hud-sidebar .hud-title-row,
.left-hud-sidebar .hud-section,
.left-hud-sidebar .action-btn,
.left-hud-sidebar .seg-control,
.left-hud-sidebar .hud-header {
  transition: opacity 0.22s ease-out;
  opacity: 1;
  min-width: 272px;
  box-sizing: border-box;
  flex-shrink: 0;
}

.left-hud-sidebar .hud-top-actions > :not(#btn-collapse-hud) {
  transition: opacity 0.22s ease-out;
  opacity: 1;
}

/* ── Animation State: Disable overflow slider & scrollbars to eliminate jank ── */
.left-hud-sidebar.animating {
  overflow: hidden !important;
  pointer-events: none !important;
  user-select: none !important;
}

.left-hud-sidebar.animating * {
  pointer-events: none !important;
}

/* ── Collapsed Button State (2.75rem x 2.75rem pill) ── */
.left-hud-sidebar.collapsed {
  width: 2.75rem !important;
  height: 2.75rem !important;
  max-height: 2.75rem !important;
  padding: 0 !important;
  pointer-events: auto;
  cursor: pointer;
  border-radius: 16px !important; /* Matches panel 16px corner radius perfectly */
  overflow: hidden !important;
  animation: none !important;
  transform: none !important;
  opacity: 0.5 !important; /* 50% opacity when unhovered */
  box-shadow: none !important; /* No drop shadow when unhovered */
  background: var(--bg-panel);
  transition:
    opacity 0.25s ease,
    box-shadow 0.25s ease,
    background 0.2s ease,
    transform 0.2s cubic-bezier(0.32, 0.72, 0, 1);
}

.left-hud-sidebar.collapsed:hover {
  opacity: 1.0 !important; /* Full opacity on hover */
  background: var(--bg-control);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5) !important; /* Drop shadow on hover */
  transform: none !important;
}

/* Content hidden immediately during collapse */
.left-hud-sidebar.collapsed .hud-title-row,
.left-hud-sidebar.collapsed .hud-section,
.left-hud-sidebar.collapsed .action-btn,
.left-hud-sidebar.collapsed .seg-control {
  opacity: 0 !important;
  pointer-events: none;
  display: none !important;
}

/* Header collapses to fill entire button area */
.left-hud-sidebar.collapsed .hud-header {
  padding: 0 !important;
  margin: 0 !important;
  border: none !important;
  gap: 0 !important;
  width: 100% !important;
  height: 100% !important;
  min-width: 0 !important;
  max-width: 100% !important;
  flex-shrink: 1 !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
}

.left-hud-sidebar.collapsed .hud-top-actions {
  width: 100% !important;
  height: 100% !important;
  min-width: 0 !important;
  max-width: 100% !important;
  gap: 0 !important;
  padding: 0 !important;
  margin: 0 !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
}

/* Hide all action buttons except the morph toggle button */
.left-hud-sidebar.collapsed .hud-top-actions > :not(#btn-collapse-hud) {
  display: none !important;
}

.left-hud-sidebar.collapsed #btn-collapse-hud {
  width: 100% !important;
  height: 100% !important;
  min-width: 0 !important;
  max-width: 100% !important;
  border-radius: 16px !important;
  border: none !important;
  flex: unset !important;
  background: transparent !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  color: #4ade80 !important;
  opacity: 1 !important;
  visibility: visible !important;
  pointer-events: auto !important;
  cursor: pointer !important;
  padding: 0 !important;
  margin: 0 !important;
}

/* ── Morph icon cross-fade ── */
.morph-icon-open,
.morph-icon-closed {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  color: var(--text-muted);
  transition: opacity 0.15s ease, transform 0.15s ease;
  pointer-events: none;
}

.morph-icon-open svg,
.morph-icon-closed svg {
  display: block;
  stroke: currentColor;
}

/* Open state: show chevron, hide expand icon */
.morph-icon-open  { opacity: 1; transform: scale(1); visibility: visible; }
.morph-icon-closed { opacity: 0; transform: scale(0.6); visibility: hidden; }

/* Collapsed state: direct static rendering to guarantee full visibility */
.left-hud-sidebar.collapsed .morph-icon-open  { display: none !important; }
.left-hud-sidebar.collapsed .morph-icon-closed {
  position: static !important;
  display: inline-flex !important;
  align-items: center !important;
  justify-content: center !important;
  opacity: 1 !important;
  visibility: visible !important;
  transform: none !important;
  color: #4ade80 !important;
  width: 100% !important;
  height: 100% !important;
}

.left-hud-sidebar.collapsed .morph-icon-closed svg {
  display: block !important;
  visibility: visible !important;
  stroke: #4ade80 !important;
  color: #4ade80 !important;
  width: 20px !important;
  height: 20px !important;
}

/* The morph button needs relative positioning for absolute icon children */
#btn-collapse-hud {
  position: relative;
}

/* HUD Header: Two Rows (Title on top, Buttons below) */
.hud-header {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding-bottom: 0.65rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  flex-shrink: 0;
}

.hud-title-row {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.3rem;
}

.hud-title {
  font-size: 1.08rem;
  font-weight: 300;
  letter-spacing: 0.04em;
  color: var(--text-main);
  text-transform: none;
}

.hud-top-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  gap: 0.35rem;
}

.hud-top-actions .icon-btn {
  flex: 1;
  min-width: 0;
  width: auto;
  height: 2.15rem;
}

/* Sidebar Group Category Header with In-Line Rule */
.hud-group-title {
  font-size: 0.76rem;
  font-weight: 500;
  text-transform: none;
  letter-spacing: 0.03em;
  color: var(--accent);
  margin-top: 0.75rem;
  margin-bottom: 0.2rem;
  padding-bottom: 0;
  border-bottom: none;
  display: flex;
  align-items: center;
  gap: 0.65rem;
  width: 100%;
}

.hud-group-title::after {
  content: "";
  flex: 1;
  height: 1px;
  background: rgba(255, 255, 255, 0.12);
}

.left-hud-sidebar .hud-group-title {
  transition: opacity 0.22s ease-out;
  opacity: 1;
  min-width: 272px;
  box-sizing: border-box;
  flex-shrink: 0;
}

.left-hud-sidebar.collapsed .hud-group-title {
  display: none !important;
}

/* Perfectly Centered Icon Buttons */
.icon-btn {
  background: var(--bg-subpanel);
  border: none;
  outline: none;
  color: var(--text-muted);
  width: 2.2rem;
  height: 2.2rem;
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  line-height: 1;
  font-size: 1.05rem;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease, filter 0.1s ease;
  flex-shrink: 0;
}

.icon-btn i {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1rem;
  height: 1rem;
  line-height: 1;
}

.icon-btn:hover {
  background: var(--bg-control);
  color: var(--text-main);
}

.icon-btn:active {
  filter: brightness(80%);
}

.icon-btn.active {
  background: var(--accent-active);
  color: #ffffff;
}

/* Top-Right Telemetry HUD */
.telemetry-hud {
  position: absolute;
  top: 1rem;
  right: 1rem;
  padding: 0.85rem 1rem;
  min-width: 210px;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  transform-origin: top right;
  border-radius: 14px;
  background: var(--bg-panel);
  box-shadow: none !important; /* No drop shadow when unhovered */
  opacity: 0.5; /* 50% opacity when unhovered, matching sidebar panel */
  transition:
    opacity 0.25s ease,
    box-shadow 0.25s ease,
    background 0.2s ease;
  visibility: visible;
  overflow: hidden;
  will-change: transform, opacity, width, height;
}

.telemetry-hud:hover {
  opacity: 1.0 !important; /* Full opacity on hover */
  background: var(--bg-control);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5) !important; /* Drop shadow on hover */
}

.telemetry-hud.hidden {
  display: none !important;
  opacity: 0 !important;
  pointer-events: none !important;
  visibility: hidden !important;
}

.telemetry-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 0.35rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.telemetry-title {
  font-size: 0.74rem;
  text-transform: none;
  letter-spacing: 0.02em;
  color: var(--text-muted);
  font-weight: 700;
}

.telemetry-grid {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  font-size: 0.78rem;
  font-variant-numeric: tabular-nums;
}

.telemetry-item {
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  align-items: center;
}

.telemetry-label {
  color: var(--text-faint);
  font-size: 0.68rem;
  font-weight: 500;
  text-transform: none;
}

.telemetry-val {
  font-weight: 600;
  color: var(--text-highlight);
}

/* HUD Form Sections */
.hud-section {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  flex-shrink: 0;
}

.hud-section-label {
  font-size: 0.74rem;
  text-transform: none;
  letter-spacing: 0.01em;
  color: var(--text-faint);
  font-weight: 700;
}

/* Segmented Control Buttons */
.seg-control {
  display: flex;
  background: var(--bg-subpanel);
  padding: 3px;
  border-radius: 8px;
  gap: 2px;
}

.seg-btn {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-muted);
  padding: 0.42rem 0.4rem;
  font-size: 0.78rem;
  font-family: inherit;
  font-weight: 500;
  border-radius: 6px;
  cursor: pointer;
  text-align: center;
  text-transform: none;
  transition: background 0.15s ease, color 0.15s ease;
}

.seg-btn:hover {
  color: var(--text-main);
}

.seg-btn:active {
  filter: brightness(85%);
}

.seg-btn.active {
  background: var(--accent-active);
  color: #ffffff;
  font-weight: 600;
}

/* Styled Select Dropdown (No borders) */
.select-styled {
  width: 100%;
  background: var(--bg-subpanel);
  border: none;
  outline: none;
  color: var(--text-main);
  padding: 0.48rem 0.75rem;
  font-size: 0.82rem;
  font-family: inherit;
  border-radius: 8px;
  cursor: pointer;
}

.select-styled option {
  background: #0f1c14;
  color: var(--text-main);
}

/* Sliders & Controls */
.control-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  font-size: 0.78rem;
  color: var(--text-muted);
  text-transform: none;
}

.range-slider {
  width: 100%;
  height: 4px;
  background: var(--bg-control);
  border: none;
  outline: none;
  border-radius: 2px;
  appearance: none;
  -webkit-appearance: none;
  cursor: pointer;
}

.range-slider::-webkit-slider-thumb {
  appearance: none;
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  border: none;
  cursor: pointer;
}

/* Toggle Switches */
.toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--text-muted);
  text-transform: none;
}

.switch {
  position: relative;
  display: inline-block;
  width: 36px;
  height: 20px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider-round {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--bg-control);
  transition: 0.2s;
  border-radius: 20px;
}

.slider-round:before {
  position: absolute;
  content: "";
  height: 14px;
  width: 14px;
  left: 3px;
  bottom: 3px;
  background-color: #ffffff;
  transition: 0.2s;
  border-radius: 50%;
}

input:checked + .slider-round {
  background-color: var(--accent-active);
}

input:checked + .slider-round:before {
  transform: translateX(16px);
}

/* Action Primary Button */
.action-btn {
  width: 100%;
  background: var(--bg-subpanel);
  border: none;
  outline: none;
  color: var(--accent);
  padding: 0.55rem 1rem;
  font-size: 0.82rem;
  font-family: inherit;
  font-weight: 600;
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  cursor: pointer;
  text-transform: none;
  transition: background 0.15s ease, color 0.15s ease;
  flex-shrink: 0;
  margin-top: 0.2rem;
}

.action-btn:hover {
  background: var(--accent);
  color: #070d09;
}

.action-btn:active {
  filter: brightness(85%);
}

/* Instructions Modal (Linear scale 0->100, no fade) */
.instructions-overlay {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  padding: 1.5rem;
  max-width: 400px;
  width: 90%;
  display: none;
  transform-origin: center center;
}

.instructions-overlay.show {
  display: block;
  animation: modalLinearZoomIn 0.22s linear forwards;
}

.instructions-overlay.hiding {
  display: block;
  animation: modalLinearZoomOut 0.22s linear forwards;
}

.instructions-overlay h3 {
  margin-bottom: 0.75rem;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  justify-content: space-between;
  align-items: center;
  text-transform: none;
}

.instructions-overlay ul {
  list-style: none;
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--text-muted);
}

.key-badge {
  display: inline-block;
  background: var(--bg-control);
  border-radius: 4px;
  padding: 0.1rem 0.4rem;
  font-family: monospace;
  font-size: 0.76rem;
  color: var(--accent);
  margin-right: 0.4rem;
}

/* Floating Sidebar Toggle Button */
.btn-open-hud {
  position: absolute;
  top: 1rem;
  left: 1rem;
  width: 2.5rem;
  height: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  color: var(--text-main);
  background: var(--bg-panel);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-radius: 10px;
  cursor: pointer;
  z-index: 9;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.22s ease, transform 0.22s ease;
  transform: scale(0.85);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.35);
}

.btn-open-hud.visible {
  opacity: 1;
  pointer-events: auto;
  transform: scale(1);
}

/* Pointer Lock Warning Toast */
.pointer-warning-toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  padding: 0.75rem 1.4rem;
  font-size: 0.85rem;
  color: #f87171;
  background: rgba(30, 15, 18, 0.92);
  border: 1px solid rgba(248, 113, 113, 0.3);
  border-radius: 8px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.25s ease, transform 0.25s ease;
  z-index: 100;
  text-align: center;
  max-width: 90vw;
}

.pointer-warning-toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* F3 Minecraft-Style Debug Overlay */
.f3-debug-overlay {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  right: 0.75rem;
  display: flex;
  justify-content: space-between;
  pointer-events: none;
  z-index: 20;
  font-family: 'Roboto Mono', monospace, sans-serif;
  font-size: 0.78rem;
  line-height: 1.45;
  color: #ffffff;
  text-shadow: 1px 1px 2px #000000;
}

.f3-debug-overlay.hidden {
  display: none;
}

.f3-left, .f3-right {
  display: flex;
  flex-direction: column;
  gap: 2px;
  background: rgba(0, 0, 0, 0.45);
  padding: 0.5rem 0.75rem;
  border-radius: 4px;
}

.f3-right {
  text-align: right;
}

.f3-debug-overlay strong {
  color: var(--accent);
}

@media (max-width: 600px) {
  .left-hud-sidebar {
    width: calc(100vw - 2rem);
    bottom: 1rem;
    max-height: calc(100vh - 2rem);
  }
  .telemetry-hud {
    right: 0.5rem;
    top: 0.5rem;
    min-width: 190px;
    padding: 0.6rem 0.75rem;
  }
  .f3-debug-overlay {
    font-size: 0.68rem;
  }
}

/* Underwater Visual Effects Overlay */
.underwater-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 4;
  display: none;
  opacity: 0;
  transition: opacity 0.25s ease;
  overflow: hidden;
}

.underwater-tint {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at 50% 30%, rgba(10, 80, 120, 0.35) 0%, rgba(4, 25, 45, 0.72) 100%);
  mix-blend-mode: multiply;
}

.underwater-vignette {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  box-shadow: inset 0 0 120px rgba(2, 18, 32, 0.85);
}

.underwater-caustics {
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background-image: radial-gradient(ellipse at center, rgba(140, 235, 255, 0.22) 0%, transparent 65%),
                    radial-gradient(circle at 30% 40%, rgba(100, 210, 255, 0.18) 0%, transparent 50%),
                    radial-gradient(circle at 70% 60%, rgba(120, 230, 255, 0.2) 0%, transparent 55%);
  background-size: 180px 180px, 240px 240px, 320px 320px;
  background-position: var(--caustic-x, 0px) var(--caustic-y, 0px),
                      calc(var(--caustic-x, 0px) * -0.7) calc(var(--caustic-y, 0px) * 0.8),
                      calc(var(--caustic-x, 0px) * 0.5) calc(var(--caustic-y, 0px) * -0.6);
  mix-blend-mode: screen;
  filter: blur(1.5px);
  animation: causticWobble 4s ease-in-out infinite alternate;
}

@keyframes causticWobble {
  0% { transform: scale(1.0) rotate(0deg); }
  100% { transform: scale(1.05) rotate(2deg); }
}