/* --------------------------------------------------------
   Hi-Tech Dark Theme
   -------------------------------------------------------- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg:        #0a0a0f;
  --bg-panel:  #0d0d16;
  --bg-glass:  rgba(13, 13, 22, 0.92);
  --border:    rgba(100, 200, 220, 0.18);
  --border-hi: rgba(100, 200, 220, 0.4);
  --text:      #c8ccd4;
  --text-dim:  #6a7080;
  --text-hi:   #e4e8f0;
  --syl:       #d4a020;
  --kov:       #20b2aa;
  --ren:       #9370db;
  --accent:    #20b2aa;
  --danger:    #d4402a;
  --success:   #2ad44a;
  --glow-syl:  0 0 8px rgba(212, 160, 32, 0.5);
  --glow-kov:  0 0 8px rgba(32, 178, 170, 0.5);
  --glow-ren:  0 0 8px rgba(147, 112, 219, 0.5);
  --glow-accent: 0 0 12px rgba(32, 178, 170, 0.35);
  --mono:      'Courier New', 'Consolas', monospace;
  --sans:      -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

html, body {
  width: 100%; height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 14px;
  overflow: hidden;
  user-select: none;
}

/* ---- App layout ---- */
#app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  background:
    repeating-linear-gradient(0deg,   transparent, transparent 59px, rgba(100,200,220,0.03) 60px),
    repeating-linear-gradient(90deg,  transparent, transparent 59px, rgba(100,200,220,0.03) 60px),
    var(--bg);
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-panel);
  min-height: 44px;
  gap: 12px;
  flex-shrink: 0;
}
header h1 {
  font-family: var(--mono);
  font-size: 16px;
  font-weight: 600;
  color: var(--accent);
  text-shadow: var(--glow-accent);
  letter-spacing: 2px;
  white-space: nowrap;
}
.header-level {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--syl);
  text-shadow: var(--glow-syl);
  letter-spacing: 1.5px;
  white-space: nowrap;
  padding: 2px 10px;
  border: 1px solid rgba(212, 160, 32, 0.25);
  border-radius: 3px;
  background: rgba(212, 160, 32, 0.06);
}
.header-controls {
  display: flex;
  align-items: center;
  gap: 8px;
}
.resonance-bar {
  position: relative;
  width: 160px;
  height: 22px;
  background: rgba(32,178,170,0.08);
  border: 1px solid var(--border);
  border-radius: 3px;
  overflow: hidden;
}
.resonance-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--kov), var(--syl));
  transition: width 0.3s;
  box-shadow: inset 0 0 8px rgba(32,178,170,0.3);
}
.resonance-bar.low .resonance-fill {
  background: linear-gradient(90deg, #cc6622, var(--syl));
}
.resonance-bar.critical .resonance-fill {
  background: linear-gradient(90deg, #cc3300, #cc6622);
}
.resonance-bar.overflow {
  border-color: rgba(255, 180, 60, 0.4);
  box-shadow: inset 0 0 10px rgba(255, 160, 40, 0.15), 0 0 6px rgba(255, 160, 40, 0.12);
}
@keyframes budget-denied {
  0%   { box-shadow: inset 0 0 0 rgba(204,102,0,0); }
  15%  { box-shadow: inset 0 0 20px rgba(204,102,0,0.7); border-color: #cc6600; }
  30%  { box-shadow: inset 0 0 12px rgba(204,60,0,0.5); }
  50%  { box-shadow: inset 0 0 18px rgba(204,102,0,0.6); border-color: #cc6600; }
  100% { box-shadow: inset 0 0 0 rgba(204,102,0,0); border-color: var(--border); }
}
@keyframes budget-denied-stripes {
  0%   { background-position: 0 0; opacity: 0; }
  10%  { opacity: 0.6; }
  50%  { opacity: 0.4; }
  100% { background-position: 28px 0; opacity: 0; }
}
.resonance-bar.denied {
  animation: budget-denied 0.6s ease-out;
}
.resonance-bar.denied::after {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: repeating-linear-gradient(
    -45deg,
    transparent,
    transparent 4px,
    rgba(204,102,0,0.35) 4px,
    rgba(204,102,0,0.35) 8px
  );
  animation: budget-denied-stripes 0.6s linear;
  opacity: 0;
  pointer-events: none;
}
.resonance-text {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--text-hi);
  text-shadow: 0 0 4px rgba(0,0,0,0.8);
  z-index: 1;
}

/* ---- Catch bar ---- */
.catch-bar {
  position: relative;
  width: 80px;
  height: 22px;
  background: rgba(147,112,219,0.08);
  border: 1px solid var(--border);
  border-radius: 3px;
  overflow: hidden;
}
.catch-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--ren), var(--kov));
  transition: width 0.3s;
  box-shadow: inset 0 0 8px rgba(147,112,219,0.3);
}
.catch-bar.empty .catch-fill {
  background: linear-gradient(90deg, #553344, #443355);
}
.catch-bar.denied {
  animation: catch-denied 0.6s ease-out;
}
.catch-bar.denied::after {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: repeating-linear-gradient(
    -45deg,
    transparent,
    transparent 4px,
    rgba(147,80,200,0.35) 4px,
    rgba(147,80,200,0.35) 8px
  );
  animation: catch-denied-stripes 0.6s linear;
  opacity: 0;
  pointer-events: none;
}
@keyframes catch-denied {
  0%   { box-shadow: inset 0 0 0 rgba(147,80,200,0); }
  15%  { box-shadow: inset 0 0 20px rgba(147,80,200,0.7); border-color: #9350c8; }
  30%  { box-shadow: inset 0 0 12px rgba(147,60,180,0.5); }
  50%  { box-shadow: inset 0 0 18px rgba(147,80,200,0.6); border-color: #9350c8; }
  100% { box-shadow: inset 0 0 0 rgba(147,80,200,0); border-color: var(--border); }
}
@keyframes catch-denied-stripes {
  0%   { background-position: 0 0; opacity: 0; }
  10%  { opacity: 0.6; }
  50%  { opacity: 0.4; }
  100% { background-position: 28px 0; opacity: 0; }
}
.catch-text {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-hi);
  text-shadow: 0 0 4px rgba(0,0,0,0.8);
  z-index: 1;
}

main {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 260px;
  gap: 0;
  overflow: hidden;
}

.canvas-wrap {
  position: relative;
  overflow: hidden;
  background: var(--bg);
}
#lattice-canvas {
  display: block;
  width: 100%;
  height: 100%;
  cursor: crosshair;
}
#minimap-canvas {
  position: absolute;
  bottom: 8px;
  right: 8px;
  width: 140px;
  height: 140px;
  border: 1px solid var(--border-hi);
  background: rgba(10,10,15,0.85);
  border-radius: 3px;
  pointer-events: none;
}

aside#panel {
  display: flex;
  flex-direction: column;
  gap: 1px;
  background: var(--border);
  border-left: 1px solid var(--border);
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--border-hi) transparent;
}
aside#panel > section {
  padding: 10px 12px;
  background: var(--bg-panel);
}
aside#panel h3 {
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-dim);
  margin-bottom: 8px;
}

/* ---- Bond signature ---- */
#bond-sig canvas {
  display: block;
  margin: 0 auto;
}

/* ---- Node info ---- */
#node-info .info-grid {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 3px 10px;
  font-family: var(--mono);
  font-size: 12px;
}
#node-info .info-label {
  color: var(--text-dim);
}
#node-info .info-val {
  color: var(--text-hi);
  text-align: right;
}

/* ---- Actions ---- */
#actions {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.action-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 7px 10px;
  font-family: var(--mono);
  font-size: 12px;
  background: linear-gradient(180deg, rgba(30,30,45,0.9), rgba(18,18,28,0.95));
  border: 1px solid var(--border);
  border-radius: 3px;
  color: var(--text);
  cursor: pointer;
  transition: all 0.15s;
}
.action-btn:hover {
  border-color: var(--accent);
  box-shadow: var(--glow-accent);
  color: var(--text-hi);
}
.action-btn.selected {
  border-color: var(--syl);
  box-shadow: var(--glow-syl);
  background: linear-gradient(180deg, rgba(60,50,20,0.5), rgba(30,25,10,0.5));
  color: var(--syl);
}
.action-btn.disabled {
  opacity: 0.35;
  pointer-events: none;
}
.action-cost {
  font-size: 11px;
  color: var(--syl);
}

/* ---- Stats ---- */
#stats .stat-row {
  display: flex;
  justify-content: space-between;
  font-family: var(--mono);
  font-size: 12px;
  padding: 2px 0;
}
#stats .stat-val {
  color: var(--accent);
}

/* ---- Sim controls ---- */
.sim-btn {
  padding: 4px 10px;
  font-family: var(--mono);
  font-size: 12px;
  background: rgba(30,30,45,0.8);
  border: 1px solid var(--border);
  border-radius: 3px;
  color: var(--text);
  cursor: pointer;
  transition: all 0.15s;
}
.sim-btn:hover { border-color: var(--accent); color: var(--text-hi); }
.sim-btn.active { border-color: var(--syl); color: var(--syl); }
#btn-restart-hud {
  border-color: var(--ren);
  color: var(--ren);
}

/* ---- Volume control ---- */
.volume-wrap {
  position: relative;
}
.volume-popup {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) translateY(-4px);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 12px 10px 8px;
  background: var(--bg-panel);
  border: 1px solid var(--border-hi);
  border-radius: 5px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.5), 0 0 12px rgba(32,178,170,0.08);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s 0.25s, transform 0.2s 0.25s;
  z-index: 50;
}
/* Invisible bridge covers the gap between button and popup */
.volume-popup::before {
  content: "";
  position: absolute;
  bottom: 100%;
  left: 0; right: 0;
  height: 12px;
}
.volume-wrap:hover .volume-popup {
  opacity: 1;
  pointer-events: all;
  transform: translateX(-50%) translateY(0);
  transition: opacity 0.2s, transform 0.2s;
}
.volume-label {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-dim);
  min-width: 24px;
  text-align: center;
}
/* Vertical range slider */
.volume-slider {
  -webkit-appearance: none;
  appearance: none;
  writing-mode: vertical-lr;
  direction: rtl;
  width: 6px;
  height: 100px;
  background: transparent;
  cursor: pointer;
}
.volume-slider::-webkit-slider-runnable-track {
  width: 6px;
  background: linear-gradient(to top, var(--accent), var(--syl));
  border-radius: 3px;
  border: 1px solid var(--border);
}
.volume-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--text-hi);
  border: 2px solid var(--accent);
  box-shadow: 0 0 6px rgba(32,178,170,0.4);
  margin-left: -4px;
  cursor: pointer;
  transition: box-shadow 0.15s;
}
.volume-slider::-webkit-slider-thumb:hover {
  box-shadow: 0 0 12px rgba(32,178,170,0.7);
}
.volume-slider::-moz-range-track {
  width: 6px;
  background: linear-gradient(to top, var(--accent), var(--syl));
  border-radius: 3px;
  border: 1px solid var(--border);
}
.volume-slider::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--text-hi);
  border: 2px solid var(--accent);
  box-shadow: 0 0 6px rgba(32,178,170,0.4);
  cursor: pointer;
}
.volume-slider::-moz-range-thumb:hover {
  box-shadow: 0 0 12px rgba(32,178,170,0.7);
}
#btn-sound.muted {
  color: var(--text-dim);
  opacity: 0.5;
}

footer {
  padding: 4px 16px;
  border-top: 1px solid var(--border);
  background: var(--bg-panel);
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-dim);
  display: flex;
  justify-content: space-between;
  flex-shrink: 0;
}

/* ---- Charge selector ---- */
.charge-selector {
  display: flex;
  gap: 3px;
  margin-top: 4px;
}
.charge-btn {
  width: 28px;
  height: 24px;
  font-family: var(--mono);
  font-size: 11px;
  background: rgba(30,30,45,0.8);
  border: 1px solid var(--border);
  border-radius: 2px;
  color: var(--text);
  cursor: pointer;
}
.charge-btn.selected { border-color: var(--syl); color: var(--syl); }

/* ---- Catch mode selector ---- */
.catch-selector {
  display: none;
  gap: 3px;
  margin-top: 4px;
}
.catch-selector.visible { display: flex; }
.catch-mode-btn {
  flex: 1;
  height: 24px;
  font-family: var(--mono);
  font-size: 11px;
  background: rgba(30,30,45,0.8);
  border: 1px solid var(--border);
  border-radius: 2px;
  color: var(--text);
  cursor: pointer;
  transition: all 0.15s;
}
.catch-mode-btn:hover { border-color: var(--accent); color: var(--text-hi); }
.catch-mode-btn.selected { border-color: var(--syl); color: var(--syl); }
.catch-mode-btn[data-catch-mode="scatter"].selected {
  border-color: var(--ren);
  color: var(--ren);
}

/* ---- Grain picker ---- */
.grain-picker {
  display: none;
  flex-direction: column;
  gap: 3px;
  margin-top: 6px;
  max-height: 260px;
  overflow-y: auto;
}
.grain-family-label {
  font-family: var(--mono);
  font-size: 9px;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: rgba(100,200,220,0.5);
  padding: 4px 6px 1px;
  margin-top: 3px;
}
.grain-family-label:first-child { margin-top: 0; }
.grain-picker.visible { display: flex; }
.grain-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 5px 8px;
  background: rgba(20,20,30,0.8);
  border: 1px solid var(--border);
  border-radius: 2px;
  font-family: var(--mono);
  font-size: 11px;
  cursor: pointer;
  transition: border-color 0.15s;
}
.grain-card:hover { border-color: var(--accent); }
.grain-card.selected { border-color: var(--syl); color: var(--syl); }
.grain-hue {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
  margin-right: 6px;
}

/* ---- Overlays ---- */
.overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(5, 5, 10, 0.88);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s;
}
.overlay.active {
  opacity: 1;
  pointer-events: all;
}
#splash-screen {
  background: var(--bg);
  cursor: pointer;
  z-index: 200;
}
#splash-canvas {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
}

.overlay-box {
  background: var(--bg-panel);
  border: 1px solid var(--border-hi);
  border-radius: 6px;
  padding: 32px 40px;
  max-width: 380px;
  width: 90%;
  text-align: center;
  box-shadow: 0 0 40px rgba(32, 178, 170, 0.08);
}
.overlay-box h2 {
  font-family: var(--mono);
  font-size: 22px;
  color: var(--accent);
  text-shadow: var(--glow-accent);
  letter-spacing: 3px;
  margin-bottom: 20px;
}
.overlay-box p {
  font-size: 13px;
  color: var(--text-dim);
  margin-bottom: 20px;
  line-height: 1.5;
}
.menu-stack {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}
.menu-btn {
  display: block;
  width: 100%;
  max-width: 260px;
  padding: 12px 28px;
  font-family: var(--mono);
  font-size: 14px;
  letter-spacing: 1px;
  background: linear-gradient(180deg, rgba(30,30,45,0.95), rgba(15,15,25,0.98));
  border: 1px solid var(--border-hi);
  border-radius: 4px;
  color: var(--text-hi);
  cursor: pointer;
  text-decoration: none;
  position: relative;
  overflow: hidden;
  transition: color 0.25s, border-color 0.3s, box-shadow 0.3s, transform 0.2s;
}
.menu-btn::before {
  content: "";
  position: absolute;
  top: 0; left: -100%; right: 0; bottom: 0;
  width: 100%;
  background: linear-gradient(90deg, transparent, rgba(32,178,170,0.08), transparent);
  transition: left 0.4s ease;
  pointer-events: none;
}
.menu-btn:hover::before {
  left: 100%;
}
.menu-btn:hover {
  border-color: var(--accent);
  box-shadow: 0 0 12px rgba(32,178,170,0.25), inset 0 0 20px rgba(32,178,170,0.06);
  color: #fff;
  transform: scale(1.03);
}
.menu-btn:active {
  transform: scale(0.98);
  transition: transform 0.08s;
}
.menu-btn.primary {
  border-color: var(--accent);
  box-shadow: 0 0 10px rgba(32,178,170,0.2);
  background: linear-gradient(180deg, rgba(32,178,170,0.12), rgba(15,15,25,0.98));
}
.menu-btn.primary:hover {
  box-shadow: 0 0 18px rgba(32,178,170,0.35), inset 0 0 24px rgba(32,178,170,0.1);
}
@keyframes menu-btn-enter {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}
.overlay.active .menu-stack .menu-btn {
  animation: menu-btn-enter 0.35s ease-out both;
}
.overlay.active .menu-stack .menu-btn:nth-child(1) { animation-delay: 0.05s; }
.overlay.active .menu-stack .menu-btn:nth-child(2) { animation-delay: 0.1s; }
.overlay.active .menu-stack .menu-btn:nth-child(3) { animation-delay: 0.15s; }
.overlay.active .menu-stack .menu-btn:nth-child(4) { animation-delay: 0.2s; }

/* ---- Level grid ---- */
.level-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
  margin: 16px 0;
}
.level-card {
  padding: 12px 8px;
  background: rgba(20,20,30,0.8);
  border: 1px solid var(--border);
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.15s;
  text-align: center;
}
.level-card:hover { border-color: var(--accent); }
.level-card.locked { opacity: 0.3; pointer-events: none; }
.level-card .lnum {
  font-family: var(--mono);
  font-size: 20px;
  color: var(--accent);
}
.level-card .lscore {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--text-dim);
  margin-top: 4px;
}

/* ---- Score screen ---- */
.score-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 4px 16px;
  text-align: left;
  font-family: var(--mono);
  font-size: 13px;
  margin: 16px 0;
}
.score-grid .score-label { color: var(--text-dim); }
.score-grid .score-val { color: var(--syl); text-align: right; }
.score-total {
  font-size: 18px;
  color: var(--accent);
  text-shadow: var(--glow-accent);
  margin-top: 12px;
}

/* ---- How to play ---- */
.help-text {
  text-align: left;
  font-size: 12px;
  line-height: 1.7;
  max-height: 50vh;
  overflow-y: auto;
  padding-right: 8px;
}
.help-text h4 {
  color: var(--accent);
  margin: 12px 0 4px;
  font-family: var(--mono);
}
.help-text kbd {
  padding: 1px 5px;
  background: rgba(100,200,220,0.1);
  border: 1px solid var(--border);
  border-radius: 2px;
  font-family: var(--mono);
  font-size: 11px;
}

/* ---- Help tabs ---- */
.help-tabs {
  display: flex;
  gap: 4px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-bottom: 1px solid var(--border);
  padding-bottom: 8px;
  margin-bottom: 12px;
  scrollbar-width: none;
}
.help-tabs::-webkit-scrollbar { display: none; }
.help-tab {
  font-family: var(--mono);
  font-size: 11px;
  padding: 6px 14px;
  border-radius: 3px;
  border: 1px solid transparent;
  border-bottom: 2px solid transparent;
  background: transparent;
  color: var(--text-dim);
  cursor: pointer;
  white-space: nowrap;
  transition: color 0.15s, border-color 0.15s;
}
.help-tab:hover {
  color: var(--text);
  border-bottom-color: rgba(100,200,220,0.3);
}
.help-tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
  text-shadow: 0 0 6px rgba(32,178,170,0.3);
}
.help-section { display: none; }
.help-section.active { display: block; }
.help-text { max-height: 60vh; }
#menu-help .overlay-box { max-width: 680px; }
.grain-entry {
  border-left: 3px solid var(--border);
  padding: 6px 0 6px 10px;
  margin-bottom: 10px;
}
.grain-entry h5 {
  font-family: var(--mono);
  font-size: 12px;
  margin-bottom: 3px;
}
.grain-stat {
  display: inline-block;
  font-family: var(--mono);
  font-size: 10px;
  padding: 1px 6px;
  margin-right: 4px;
  border-radius: 2px;
  background: rgba(100,200,220,0.06);
  border: 1px solid var(--border);
  color: var(--text-dim);
}

/* ---- Responsive ---- */
@media (max-width: 768px) {
  main {
    grid-template-columns: 1fr;
    grid-template-rows: 1fr auto;
  }
  aside#panel {
    border-left: none;
    border-top: 1px solid var(--border);
    flex-direction: row;
    flex-wrap: wrap;
    max-height: 180px;
    overflow-y: auto;
  }
  aside#panel > section {
    flex: 1 1 140px;
    min-width: 120px;
  }
  .level-grid { grid-template-columns: repeat(5, 1fr); }
  #minimap-canvas { width: 100px; height: 100px; }
  .help-tab { font-size: 10px; padding: 4px 10px; }
  #menu-help .overlay-box { padding: 20px 16px; }
  .help-text { max-height: 55vh; }
}

@keyframes pulse {
  0%, 100% { opacity: 0.7; }
  50% { opacity: 1; }
}