:root {
  --bg: #000000;
  --panel: #12141a;
  --border: #475bb6;
  --accent: #00f587;
  --accent2: #00b8ff;
  --warn: #ff6b6b;
  --text: #e4e6f0;
  --muted: #fbfbfc;
  --bar-default: #2f2f74;
  --bar-active: #f4f4f9;
  --bar-compare: #00b8ff;
  --bar-sorted: #09f075;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: Arial, Helvetica, sans-serif;
  min-height: 100vh;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.04'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 0;
}

header {
  padding: 16px 40px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: relative;
  z-index: 10;
  gap: 20px;
}

.logo { font-size: 1.4rem; font-weight: 800; letter-spacing: -0.02em; }
.logo span { color: var(--accent); }

.badge {
  font-family: Verdana, Geneva, Tahoma, sans-serif;
  font-size: 0.65rem;
  background: var(--border);
  color: var(--muted);
  padding: 4px 10px;
  border-radius: 20px;
  border: 1px solid var(--border);
}

.header-nav {
  display: flex;
  gap: 6px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 4px;
}

.nav-btn {
  background: none;
  border: none;
  color: var(--muted);
  font-family:Verdana, Geneva, Tahoma, sans-serif;
  font-weight: 700;
  font-size: 0.8rem;
  padding: 7px 16px;
  border-radius: 7px;
  cursor: pointer;
  transition: all 0.15s;
}
.nav-btn:hover { color: var(--text); }
.nav-btn.active { background: var(--accent); color: #000; }

.main {
  display: grid;
  grid-template-columns: 260px 1fr;
  min-height: calc(100vh - 65px);
  position: relative;
  z-index: 1;
}

.sidebar {
  border-right: 1px solid var(--border);
  padding: 24px 20px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.section-label {
  font-family: Verdana, Geneva, Tahoma, sans-serif;
  font-size: 0.6rem;
  letter-spacing: 0.15em;
  color: var(--muted);
  text-transform: uppercase;
  margin-bottom: 10px;
}

.algo-list { display: flex; flex-direction: column; gap: 6px; }

.algo-btn {
  background: none;
  border: 1px solid var(--border);
  color: var(--muted);
  font-family: Verdana, Geneva, Tahoma, sans-serif;
  font-size: 0.85rem;
  font-weight: 700;
  padding: 10px 14px;
  border-radius: 8px;
  cursor: pointer;
  text-align: left;
  transition: all 0.15s;
  display: flex;
  align-items: center;
  gap: 10px;
}
.algo-btn .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--border); flex-shrink: 0; }
.algo-btn:hover { border-color: var(--accent); color: var(--text); }
.algo-btn.active { background: rgba(0,245,160,0.07); border-color: var(--accent); color: var(--accent); }
.algo-btn.active .dot { background: var(--accent); box-shadow: 0 0 6px var(--accent); }

.controls { display: flex; flex-direction: column; gap: 14px; }
.control-row { display: flex; flex-direction: column; gap: 6px; }

input[type=range] {
  -webkit-appearance: none;
  width: 100%; height: 3px;
  background: var(--border);
  border-radius: 10px; outline: none;
}
input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  box-shadow: 0 0 8px var(--accent);
}

.range-labels {
  display: flex;
  justify-content: space-between;
  font-family: Verdana, Geneva, Tahoma, sans-serif;
  font-size: 0.6rem;
  color: var(--muted);
}

.btn-row { display: flex; gap: 8px; }

.btn {
  flex: 1;
  padding: 10px;
  border-radius: 8px;
  border: none;
  font-family: Verdana, Geneva, Tahoma, sans-serif;
  font-weight: 700;
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.15s;
}
.btn-primary { background: var(--accent); color: #000; }
.btn-primary:hover { filter: brightness(1.1); transform: translateY(-1px); }
.btn-primary:disabled { opacity: 0.4; cursor: not-allowed; transform: none; filter: none; }
.btn-secondary { background: var(--border); color: var(--text); }
.btn-secondary:hover { background: #2a2d40; }

.custom-input-wrap { display: flex; flex-direction: column; gap: 6px; }
.custom-input-wrap input[type=text] {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 7px;
  color: var(--text);
  font-family: Verdana, Geneva, Tahoma, sans-serif;
  font-size: 0.7rem;
  padding: 8px 10px;
  outline: none;
  width: 100%;
  transition: border-color 0.15s;
}
.custom-input-wrap input[type=text]:focus { border-color: var(--accent); }
.custom-input-wrap input[type=text].error { border-color: var(--warn); }

.input-hint { font-family:Verdana, Geneva, Tahoma, sans-serif; font-size: 0.55rem; color: var(--muted); }
.input-hint.err { color: var(--warn); }

.btn-apply {
  background: rgba(0,245,160,0.1);
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 7px;
  padding: 7px;
  font-family: Verdana, Geneva, Tahoma, sans-serif;
  font-weight: 700;
  font-size: 0.78rem;
  cursor: pointer;
  transition: all 0.15s;
  width: 100%;
}
.btn-apply:hover { background: rgba(0,245,160,0.18); }
.btn-apply:disabled { opacity: 0.35; cursor: not-allowed; }

.info-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px;
  flex: 1;
}
.info-card h3 { font-size: 0.85rem; color: var(--accent); margin-bottom: 8px; }
.info-card p  { font-size: 0.72rem; color: var(--muted); line-height: 1.6; margin-bottom: 10px; }

.complexity-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; }
.complexity-item {
  background: var(--bg);
  border-radius: 6px;
  padding: 7px 10px;
  font-family: Verdana, Geneva, Tahoma, sans-serif;
}
.complexity-item .c-label { font-size: 0.55rem; color: var(--muted); text-transform: uppercase; }
.complexity-item .c-val   { font-size: 0.75rem; color: var(--accent2); margin-top: 2px; }

.canvas-area { display: flex; flex-direction: column; padding: 28px 36px; gap: 20px; }

.stats-row { display: flex; gap: 14px; flex-wrap: wrap; }
.stat-box {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 20px;
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 110px;
}
.stat-box .s-label {
  font-family: Verdana, Geneva, Tahoma, sans-serif;
  font-size: 0.55rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.stat-box .s-val {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.status-bar {
  font-family: Verdana, Geneva, Tahoma, sans-serif;
  font-size: 0.7rem;
  color: var(--accent2);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 9px 16px;
  min-height: 36px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.status-bar::before { content: '>'; color: var(--accent); }

.bars-wrap {
  flex: 1;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px 24px 10px;
  display: flex;
  align-items: flex-end;
  gap: 3px;
  min-height: 300px;
  position: relative;
  overflow: hidden;
}
.bars-wrap::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 1px;
  background: var(--border);
}

.bar {
  flex: 1;
  border-radius: 4px 4px 0 0;
  background: var(--bar-default);
  transition: height 0.08s ease, background 0.08s ease;
  min-width: 3px;
}
.bar.active  { background: var(--bar-active);  box-shadow: 0 0 10px rgba(0,245,160,0.4); }
.bar.compare { background: var(--bar-compare); box-shadow: 0 0 10px rgba(0,184,255,0.4); }
.bar.sorted  { background: var(--bar-sorted); }

.legend { display: flex; gap: 20px; align-items: center; flex-wrap: wrap; }
.legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.68rem;
  color: var(--muted);
  font-family: Verdana, Geneva, Tahoma, sans-serif;
}
.legend-dot { width: 10px; height: 10px; border-radius: 2px; }

.array-output {
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px 20px;
  animation: fadeSlideIn 0.4s ease forwards;
  flex-wrap: wrap;
}
@keyframes fadeSlideIn { from { opacity:0; transform:translateY(10px); } to { opacity:1; transform:translateY(0); } }

.output-col { display: flex; flex-direction: column; gap: 8px; flex: 1; min-width: 0; }
.output-label { font-family: Verdana, Geneva, Tahoma, sans-serif; font-size: 0.55rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); }
.output-values { display: flex; flex-wrap: wrap; gap: 5px; }

.output-chip {
  font-family: Verdana, Geneva, Tahoma, sans-serif;
  font-size: 0.72rem;
  padding: 4px 9px;
  border-radius: 5px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  animation: chipPop 0.2s ease forwards;
  opacity: 0;
}
.output-chip.sorted-chip { color: var(--accent); border-color: rgba(0,245,160,0.3); background: rgba(0,245,160,0.05); }
@keyframes chipPop { from { opacity:0; transform:scale(0.7); } to { opacity:1; transform:scale(1); } }

.output-arrow { font-size: 1.4rem; color: var(--accent); font-weight: 700; flex-shrink: 0; align-self: center; }

.copy-btn {
  flex-shrink: 0;
  align-self: flex-start;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  font-family: Verdana, Geneva, Tahoma, sans-serif;
  font-size: 0.62rem;
  padding: 6px 12px;
  border-radius: 7px;
  cursor: pointer;
  transition: all 0.15s;
}
.copy-btn:hover, .copy-btn.copied { border-color: var(--accent); color: var(--accent); }

#modeComparison {
  display: flex;
  flex-direction: column;
  height: calc(100vh - 65px);
  max-height: calc(100vh - 65px);
  position: relative;
  z-index: 1;
  overflow: hidden;
}

.cmp-toolbar {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 10px 24px;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
  flex-wrap: wrap;
  flex-shrink: 0;
}

.cmp-mode-btns {
  display: flex;
  gap: 6px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 4px;
  flex-shrink: 0;
}
.cmp-mode-btn {
  background: none;
  border: none;
  color: var(--muted);
  font-family: Verdana, Geneva, Tahoma, sans-serif;
  font-weight: 700;
  font-size: 0.78rem;
  padding: 7px 14px;
  border-radius: 7px;
  cursor: pointer;
  transition: all 0.15s;
}
.cmp-mode-btn:hover { color: var(--text); }
.cmp-mode-btn.active { background: var(--accent); color: #000; }

.cmp-pickers { display: flex; gap: 16px; }
.cmp-picker-wrap { display: flex; flex-direction: column; gap: 4px; }

.cmp-select {
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text);
  font-family: Verdana, Geneva, Tahoma, sans-serif;
  font-weight: 600;
  font-size: 0.78rem;
  padding: 7px 10px;
  border-radius: 7px;
  outline: none;
  cursor: pointer;
  transition: border-color 0.15s;
}
.cmp-select:focus { border-color: var(--accent); }

.cmp-controls { display: flex; flex-direction: column; gap: 8px; flex: 1; max-width: 260px; }
.cmp-ctrl-row { display: flex; align-items: center; gap: 8px; }
.cmp-ctrl-label { font-family: Verdana, Geneva, Tahoma, sans-serif; font-size: 0.6rem; color: var(--muted); white-space: nowrap; min-width: 36px; }

.cmp-action-btns { display: flex; gap: 8px; flex-shrink: 0; }
.cmp-action-btns .btn { flex: none; padding: 10px 20px; }

.cmp-arena {
  display: grid;
  gap: 1px;
  background: var(--border);
  flex: 1;
  overflow: auto;
  min-height: 0;
}
.cmp-arena.grid-5 { grid-template-columns: repeat(5, 1fr); }
.cmp-arena.grid-2 { grid-template-columns: repeat(2, 1fr); }

.race-panel {
  background: var(--bg);
  display: flex;
  flex-direction: column;
  padding: 10px 12px;
  gap: 8px;
  min-height: 0;
  overflow: hidden;
}

.race-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
}
.race-name {
  font-size: 0.75rem;
  font-weight: 800;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.race-badge {
  font-family: Verdana, Geneva, Tahoma, sans-serif;
  font-size: 0.55rem;
  padding: 3px 8px;
  border-radius: 20px;
  border: 1px solid var(--border);
  color: var(--muted);
}
.race-badge.winner { border-color: var(--accent); color: var(--accent); background: rgba(0,245,160,0.08); }
.race-badge.running { border-color: var(--accent2); color: var(--accent2); }

.race-bars {
  flex: 1;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 8px 4px;
  display: flex;
  align-items: flex-end;
  gap: 2px;
  min-height: 0;
  position: relative;
  overflow: hidden;
}
.race-bars::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 1px;
  background: var(--border);
}

.race-stats {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 4px;
  flex-shrink: 0;
}
.race-stat {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 4px 6px;
  display: flex;
  flex-direction: column;
  gap: 1px;
}
.race-stat .rs-label { font-family: Verdana, Geneva, Tahoma, sans-serif; font-size: 0.44rem; color: var(--muted); text-transform: uppercase; }
.race-stat .rs-val   { font-size: 0.78rem; font-weight: 800; color: var(--accent); font-variant-numeric: tabular-nums; }

.winner-banner {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: var(--panel);
  border: 2px solid var(--accent);
  border-radius: 16px;
  padding: 28px 48px;
  text-align: center;
  z-index: 100;
  box-shadow: 0 0 60px rgba(0,245,160,0.2);
  animation: bannerPop 0.4s cubic-bezier(0.175,0.885,0.32,1.275) forwards;
}
@keyframes bannerPop { from { opacity:0; transform:translate(-50%,-50%) scale(0.7); } to { opacity:1; transform:translate(-50%,-50%) scale(1); } }

.winner-banner h2 { font-size: 1.6rem; color: var(--accent); margin-bottom: 6px; }
.winner-banner p  { font-family: Verdana, Geneva, Tahoma, sans-serif; font-size: 0.72rem; color: var(--muted); margin-bottom: 16px; }
.winner-banner button {
  background: var(--accent);
  color: #000;
  border: none;
  border-radius: 8px;
  padding: 10px 24px;
  font-family: Verdana, Geneva, Tahoma, sans-serif;
  font-weight: 700;
  font-size: 0.85rem;
  cursor: pointer;
}

@media (max-width: 900px) {
  .main { grid-template-columns: 1fr; }
  .sidebar { border-right: none; border-bottom: 1px solid var(--border); }
  header { padding: 12px 16px; }
  .canvas-area { padding: 16px; }
  .cmp-arena.grid-5 { grid-template-columns: repeat(3, 1fr); }
}