/* ===== CSS RESET & ROOT ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg-deep: #000005;
  --bg-space: #03030f;
  --bg-panel: rgba(5, 5, 20, 0.25);
  --bg-card: rgba(15, 15, 40, 0.15);
  --bg-card-hover: rgba(25, 25, 60, 0.4);
  --accent: #a855f7;
  --accent-glow: #9333ea;
  --accent2: #06b6d4;
  --accent3: #f59e0b;
  --danger: #ef4444;
  --text-primary: #f0f0ff;
  --text-secondary: #8888bb;
  --text-muted: #444466;
  --border: rgba(168, 85, 247, 0.2);
  --border-bright: rgba(168, 85, 247, 0.5);
  --glow-purple: 0 0 20px rgba(168,85,247,0.4);
  --glow-cyan: 0 0 20px rgba(6,182,212,0.4);
  --glow-orange: 0 0 20px rgba(245,158,11,0.4);
  --font-hud: 'Orbitron', 'Prompt', sans-serif;
  --font-body: 'Inter', 'Prompt', sans-serif;
  --font-mono: 'Space Mono', 'Prompt', monospace;
  --panel-h: 240px;
}

html, body {
  width: 100%; height: 100%;
  overflow: hidden;
  background: var(--bg-deep);
  color: var(--text-primary);
  font-family: var(--font-body);
  user-select: none;
}

.hidden { display: none !important; }

/* ===== LOADING SCREEN ===== */
#loading-screen {
  position: fixed; inset: 0; z-index: 9999;
  background: var(--bg-deep);
  display: flex; align-items: center; justify-content: center;
  flex-direction: column;
}
.loading-content { text-align: center; position: relative; }
.loading-ring {
  width: 120px; height: 120px;
  border-radius: 50%;
  border: 2px solid transparent;
  border-top-color: var(--accent);
  animation: spin 1.2s linear infinite;
  position: absolute; top: 50%; left: 50%;
  transform: translate(-50%, -50%);
}
.loading-ring-2 {
  width: 90px; height: 90px;
  border-top-color: var(--accent2);
  animation-duration: 0.9s; animation-direction: reverse;
}
.loading-ring-3 {
  width: 60px; height: 60px;
  border-top-color: var(--accent3);
  animation-duration: 0.6s;
}
.loading-text {
  font-family: var(--font-hud);
  font-size: 0.75rem;
  letter-spacing: 0.3em;
  color: var(--text-secondary);
  margin-top: 90px;
  animation: pulse 1.5s ease-in-out infinite;
}
.loading-bar-wrap {
  width: 200px; height: 2px;
  background: rgba(255,255,255,0.1);
  border-radius: 2px;
  margin: 16px auto 0;
  overflow: hidden;
}
.loading-bar {
  height: 100%; width: 0;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  transition: width 0.1s linear;
}

/* ===== HEADER ===== */
#header {
  position: fixed; top: 0; left: 0; right: 0;
  height: 56px; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 20px;
  background: rgba(0,0,5,0.25);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}
.header-left { display: flex; align-items: center; gap: 10px; }
.header-icon { font-size: 1.4rem; }
.header-title {
  font-family: var(--font-hud);
  font-size: 1rem; font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--text-primary);
}
.header-title .accent { color: var(--accent); }
.header-right { display: flex; align-items: center; gap: 12px; }
.header-badge {
  font-family: var(--font-mono);
  font-size: 0.6rem; letter-spacing: 0.1em;
  color: var(--accent2);
  border: 1px solid var(--accent2);
  border-radius: 4px;
  padding: 3px 8px;
  opacity: 0.8;
}
.btn-icon {
  background: transparent; border: none;
  color: var(--text-secondary); font-size: 1.1rem;
  cursor: pointer; padding: 4px;
  transition: color 0.2s, transform 0.2s;
}
.btn-icon:hover { color: var(--accent); transform: scale(1.15); }

/* ===== CANVAS ===== */
#canvas-container {
  position: fixed;
  top: 56px;
  left: 0; right: 0;
  bottom: var(--panel-h);
  overflow: hidden;
}
#bhCanvas {
  width: 100%; height: 100%;
  display: block;
  cursor: grab;
}
#bhCanvas:active { cursor: grabbing; }

/* ===== HUD ===== */
#hud-overlay {
  position: absolute; inset: 0;
  pointer-events: none;
}
.hud-corner {
  position: absolute; padding: 10px 14px;
  background: rgba(0,0,10,0.55);
  border: 1px solid var(--border);
  border-radius: 6px;
  backdrop-filter: blur(8px);
  min-width: 160px;
}
.hud-tl { top: 16px; left: 16px; }
.hud-tr { top: 16px; right: 16px; }
.hud-bl { bottom: 16px; left: 16px; }
.hud-br { bottom: 16px; right: 16px; }
.hud-label {
  font-family: var(--font-hud);
  font-size: 0.52rem; letter-spacing: 0.12em;
  color: var(--text-muted);
  margin-bottom: 4px;
}
.hud-value {
  font-family: var(--font-mono);
  font-size: 0.85rem; color: var(--accent2);
  text-shadow: var(--glow-cyan);
}
.hud-center-label {
  position: absolute; top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  font-family: var(--font-hud);
  font-size: 1.1rem; font-weight: 700;
  color: rgba(168,85,247,0.6);
  letter-spacing: 0.2em;
  text-align: center;
  pointer-events: none;
  transition: opacity 0.5s;
}


/* ===== BOTTOM PANEL ===== */
#bottom-panel {
  position: fixed; bottom: 0; left: 0; right: 0;
  height: var(--panel-h);
  background: var(--bg-panel);
  border-top: 1px solid var(--border);
  backdrop-filter: blur(24px);
  display: flex; flex-direction: row;
  overflow-x: auto; overflow-y: hidden;
  gap: 0;
  z-index: 50;
}
.panel-section {
  padding: 14px 18px;
  flex-shrink: 0;
  display: flex; flex-direction: column; gap: 10px;
  min-width: 0;
}
#section-bh { min-width: 480px; }
#section-obj { min-width: 520px; flex: 1; }
#section-physics { min-width: 280px; max-width: 340px; }

.panel-divider {
  width: 1px;
  background: var(--border);
  margin: 12px 0;
  flex-shrink: 0;
}
.section-header {
  display: flex; align-items: center; gap: 8px;
  flex-shrink: 0;
}
.section-icon { font-size: 1rem; }
.section-header h2 {
  font-family: var(--font-hud);
  font-size: 0.7rem; font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--text-secondary);
  text-transform: uppercase;
}

/* ===== BLACK HOLE CARDS ===== */
.bh-cards {
  display: flex; gap: 8px;
  overflow-x: auto; flex: 1;
  padding-bottom: 4px;
  align-items: stretch;
}
.bh-card {
  flex-shrink: 0;
  width: 110px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 8px;
  cursor: pointer;
  transition: all 0.25s ease;
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  text-align: center;
  position: relative; overflow: hidden;
}
.bh-card::before {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(circle at 50% 40%, rgba(168,85,247,0.08), transparent 70%);
  opacity: 0; transition: opacity 0.3s;
}
.bh-card:hover { border-color: var(--border-bright); transform: translateY(-2px); box-shadow: var(--glow-purple); }
.bh-card:hover::before { opacity: 1; }
.bh-card.active {
  border-color: var(--accent);
  background: rgba(168,85,247,0.15);
  box-shadow: var(--glow-purple), inset 0 0 20px rgba(168,85,247,0.1);
}
.bh-card.active::before { opacity: 1; }
.bh-card-icon { font-size: 2rem; line-height: 1; }
.bh-card-name {
  font-family: var(--font-hud);
  font-size: 0.58rem; font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--text-primary);
}
.bh-card-sub {
  font-size: 0.6rem;
  color: var(--text-secondary);
  line-height: 1.3;
}
.bh-card-mass {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--accent2);
  margin-top: auto;
}

/* ===== OBJECT GRID ===== */
.obj-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(68px, 1fr));
  gap: 6px;
  overflow-y: auto; flex: 1;
  padding-right: 4px;
}
.obj-btn {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 4px;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex; flex-direction: column; align-items: center; gap: 4px;
  text-align: center;
  color: var(--text-primary);
  font-family: var(--font-body);
}
.obj-btn:hover {
  border-color: var(--accent2);
  box-shadow: var(--glow-cyan);
  transform: translateY(-2px) scale(1.03);
}
.obj-btn:active { transform: scale(0.96); }
.obj-btn-icon { font-size: 1.4rem; line-height: 1; }
.obj-btn-name {
  font-size: 0.58rem;
  color: var(--text-secondary);
  line-height: 1.2;
}
.obj-btn-mass {
  font-family: var(--font-mono);
  font-size: 0.52rem;
  color: var(--accent3);
}

/* ===== PHYSICS PANEL ===== */
#physics-output {
  flex: 1; overflow-y: auto;
  display: flex; flex-direction: column; gap: 8px;
}
.physics-placeholder {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  text-align: center;
  margin-top: 20px;
  line-height: 1.6;
}
.physics-result {
  display: flex; flex-direction: column; gap: 6px;
}
.physics-row {
  display: flex; justify-content: space-between; align-items: center;
  padding: 4px 0;
  border-bottom: 1px solid rgba(255,255,255,0.05);
}
.physics-row-label {
  font-size: 0.62rem;
  color: var(--text-secondary);
}
.physics-row-value {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-primary);
}
.physics-fate {
  font-family: var(--font-hud);
  font-size: 0.7rem;
  padding: 8px;
  border-radius: 6px;
  text-align: center;
  letter-spacing: 0.1em;
  margin-top: 4px;
}
.fate-spaghetti { background: rgba(239,68,68,0.2); border: 1px solid #ef4444; color: #fca5a5; }
.fate-absorbed  { background: rgba(168,85,247,0.2); border: 1px solid var(--accent); color: #d8b4fe; }
.fate-evaporate { background: rgba(245,158,11,0.2); border: 1px solid var(--accent3); color: #fcd34d; }
.fate-merge     { background: rgba(6,182,212,0.2); border: 1px solid var(--accent2); color: #67e8f9; }
.fate-destroy   { background: rgba(239,68,68,0.3); border: 1px solid #f97316; color: #fdba74; }
.fate-engulf    { background: rgba(20,184,166,0.2); border: 1px solid #14b8a6; color: #5eead4; }



/* ===== MODAL ===== */
.modal {
  position: fixed; inset: 0; z-index: 200;
  display: flex; align-items: center; justify-content: center;
}
.modal-backdrop {
  position: absolute; inset: 0;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(6px);
}
.modal-box {
  position: relative; z-index: 1;
  background: rgba(8,8,25,0.97);
  border: 1px solid var(--border-bright);
  border-radius: 16px;
  padding: 28px 32px;
  max-width: 500px; width: 90%;
  box-shadow: var(--glow-purple);
  animation: modalIn 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.modal-box h2 {
  font-family: var(--font-hud);
  font-size: 1rem; margin-bottom: 16px;
  color: var(--text-primary);
}
.modal-box p { font-size: 0.85rem; color: var(--text-secondary); margin-bottom: 12px; line-height: 1.6; }
.modal-box ul { list-style: none; margin-bottom: 12px; display: flex; flex-direction: column; gap: 8px; }
.modal-box li {
  font-size: 0.8rem; color: var(--text-secondary);
  padding-left: 12px; position: relative;
}
.modal-box li::before { content: '▸'; position: absolute; left: 0; color: var(--accent); }
.modal-box li strong { color: var(--text-primary); }
.modal-box .note { font-size: 0.72rem; color: var(--text-muted); border-top: 1px solid var(--border); padding-top: 12px; margin-top: 12px; }
.modal-close {
  position: absolute; top: 14px; right: 16px;
  background: transparent; border: none;
  color: var(--text-muted); font-size: 1.1rem;
  cursor: pointer; transition: color 0.2s;
}
.modal-close:hover { color: var(--text-primary); }

/* ===== ANIMATIONS ===== */
@keyframes spin { to { transform: translate(-50%, -50%) rotate(360deg); } }
@keyframes pulse {
  0%, 100% { opacity: 0.5; } 50% { opacity: 1; }
}
@keyframes slideInRight {
  from { transform: translateX(10px); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}
@keyframes modalIn {
  from { transform: scale(0.9) translateY(10px); opacity: 0; }
  to { transform: scale(1) translateY(0); opacity: 1; }
}
@keyframes throw {
  0% { transform: scale(1); opacity: 1; }
  50% { transform: scale(0.5); opacity: 0.7; }
  100% { transform: scale(0); opacity: 0; }
}

/* Scrollbar styling */
::-webkit-scrollbar { width: 4px; height: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }
::-webkit-scrollbar-thumb:hover { background: var(--border-bright); }

/* Soundtrack Track List */
.track-item {
  background: rgba(255, 255, 255, 0.03);
  padding: 8px 12px;
  border-radius: 6px;
  cursor: pointer;
  font-family: var(--font-body);
  font-size: 0.85rem;
  color: #a1a1aa;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.track-item:hover {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
}
  background: rgba(168, 85, 247, 0.15);
  border-color: #a855f7;
  color: #d8b4fe;
}
.track-item .track-icon {
  margin-right: 12px;
  font-size: 1rem;
}

/* ===== GLASSMORPHISM UI ===== */
.glass-menu-container {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 900px;
  max-width: 95vw;
  background: rgba(20, 15, 10, 0.4);
  backdrop-filter: blur(25px);
  -webkit-backdrop-filter: blur(25px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 20px;
  padding: 30px 40px;
  box-shadow: 0 30px 60px rgba(0,0,0,0.6), inset 0 0 40px rgba(255,150,50,0.1);
  color: white;
  z-index: 100;
  display: flex;
  flex-direction: column;
  gap: 30px;
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.glass-menu-container.hidden {
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, -45%) scale(0.95);
}

.glass-menu-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}

.glass-header {
  display: flex;
  align-items: center;
  gap: 15px;
}

.glass-logo {
  color: #fff;
  opacity: 0.9;
}

.glass-title-area {
  display: flex;
  flex-direction: column;
}

.glass-title {
  font-family: 'Space Mono', monospace;
  font-size: 1.2rem;
  letter-spacing: 3px;
  font-weight: 700;
}

.glass-subtitle {
  font-family: 'Space Mono', monospace;
  font-size: 0.6rem;
  letter-spacing: 2px;
  color: rgba(255,255,255,0.5);
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 4px;
}

.btn-hide {
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.2);
  color: rgba(255,255,255,0.7);
  font-size: 0.6rem;
  padding: 2px 8px;
  border-radius: 4px;
  cursor: pointer;
  transition: 0.2s;
}

.btn-hide:hover {
  background: rgba(255,255,255,0.2);
  color: #fff;
}

.glass-indicators {
  display: flex;
  gap: 20px;
}

.indicator {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  background: rgba(0,0,0,0.3);
  padding: 8px 15px;
  border-radius: 8px;
  border: 1px solid rgba(255,255,255,0.05);
}

.ind-label {
  font-family: 'Space Mono', monospace;
  font-size: 0.55rem;
  letter-spacing: 1px;
  color: rgba(255,255,255,0.5);
  margin-bottom: 2px;
}

.ind-value {
  font-family: 'Space Mono', monospace;
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 1px;
  color: rgba(255,255,255,0.9);
}

.glass-menu-body {
  display: flex;
  gap: 40px;
  padding: 20px;
  background: rgba(255,255,255,0.03);
  border-radius: 12px;
  border: 1px solid rgba(255,255,255,0.05);
}

.glass-column {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.glass-col-header {
  font-family: 'Space Mono', monospace;
  font-size: 0.75rem;
  letter-spacing: 2px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 5px;
}

.dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
}

.dot.green {
  background-color: #4ade80;
  box-shadow: 0 0 10px #4ade80;
}

.glass-slider-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.glass-slider-header {
  display: flex;
  justify-content: space-between;
  font-family: 'Space Mono', monospace;
  font-size: 0.65rem;
  letter-spacing: 1px;
  color: rgba(255,255,255,0.8);
}

.glass-slider-header span:last-child {
  font-weight: 700;
  color: #fff;
}

.glass-slider {
  -webkit-appearance: none;
  width: 100%;
  height: 2px;
  background: rgba(255,255,255,0.2);
  border-radius: 2px;
  outline: none;
}

.glass-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #fff;
  cursor: pointer;
  box-shadow: 0 0 10px rgba(255,255,255,0.8);
  transition: transform 0.1s;
}

.glass-slider::-webkit-slider-thumb:hover {
  transform: scale(1.3);
}

.glass-menu-footer {
  display: flex;
  gap: 15px;
  justify-content: center;
}

.glass-btn {
  font-family: 'Space Mono', monospace;
  font-size: 0.75rem;
  letter-spacing: 2px;
  padding: 10px 30px;
  border-radius: 8px;
  cursor: pointer;
  transition: 0.2s;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  color: #fff;
}

.glass-btn:hover {
  background: rgba(255,255,255,0.15);
  border-color: rgba(255,255,255,0.3);
}

.glass-btn.outline {
  background: transparent;
}

.glass-btn.outline:hover {
  background: rgba(255,255,255,0.1);
}

.w-full {
  flex: 1;
}

.glass-tabs {
  position: absolute;
  bottom: -20px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  background: #111;
  border-radius: 15px;
  padding: 5px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.8);
  border: 1px solid rgba(255,255,255,0.1);
}

.glass-tab {
  font-family: 'Space Mono', monospace;
  font-size: 0.65rem;
  letter-spacing: 2px;
  padding: 10px 25px;
  border-radius: 10px;
  background: transparent;
  border: none;
  color: rgba(255,255,255,0.5);
  cursor: pointer;
  transition: 0.2s;
}

.glass-tab:hover {
  color: rgba(255,255,255,0.8);
}

.glass-tab.active {
  background: #fff;
  color: #000;
  font-weight: 700;
}

/* ===== MOBILE OPTIMIZATIONS (Vertical Stack) ===== */
@media (max-width: 768px) {
  :root {
    --panel-h: 45vh; /* Responsive height for vertical mobile panel */
  }

  /* Slide up/down vertical panel */
  #bottom-panel {
    flex-direction: column;
    overflow-x: hidden !important;
    overflow-y: auto !important;
    height: var(--panel-h);
    border-top: 1px solid var(--border-bright);
    box-shadow: 0 -10px 30px rgba(0,0,0,0.8);
  }

  .panel-section {
    width: 100%;
    min-width: unset !important;
    max-width: none !important;
    padding: 16px;
  }

  .panel-divider {
    width: 100%;
    height: 1px;
    margin: 4px 0;
    background: var(--border);
  }
  
  .bh-cards {
    padding-bottom: 8px; /* Room for scrollbar */
  }

  /* Shrink camera hints */
  #cam-hint {
    gap: 8px !important;
  }
  #cam-hint span {
    font-size: 10px !important;
  }
  #btn-cam-mode {
    font-size: 0.7rem !important;
    padding: 4px 8px !important;
  }

  /* Header adjustments */
  .header-title {
    font-size: 0.85rem;
  }
  .header-badge {
    display: none; /* Hide badge to save space */
  }

  /* Time HUD adjustments */
  #time-obs, #time-earth {
    font-size: 1.3rem !important;
  }
}