@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700&display=swap');

:root {
  --bg-dark: #0f172a;       /* Slate 900 */
  --bg-card: #1e293b;       /* Slate 800 */
  --bg-control: #334155;    /* Slate 700 */
  --text-primary: #f8fafc;  /* Slate 50 */
  --text-muted: #94a3b8;    /* Slate 400 */
  --primary: #6366f1;       /* Indigo 500 */
  --primary-hover: #4f46e5; /* Indigo 600 */
  --accent: #06b6d4;        /* Cyan 500 */
  
  /* Sorting state colors */
  --cell-default: #3b82f6;  /* Blue 500 */
  --cell-compare: #ffd54f;  /* Amber Yellow */
  --cell-swap: #ff7043;     /* Coral Orange */
  --cell-sorted: #10b981;   /* Emerald Green */
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Outfit', sans-serif;
  user-select: none;
}

body {
  background-color: var(--bg-dark);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

/* Nav Container & Glassmorphism Header */
.nav-container {
  background: rgba(30, 41, 59, 0.75);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  padding: 1.2rem 2.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.2);
}

.title {
  color: #ffffff;
  font-weight: 700;
  font-size: 1.6rem;
  letter-spacing: -0.025em;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: opacity 0.2s;
}

.title:hover {
  opacity: 0.9;
}

.title::before {
  content: "📊";
}

/* Navbar Controls */
.navbar {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.navbar a,
.navbar select {
  font-size: 0.95rem;
  font-weight: 500;
  padding: 0.6rem 1.1rem;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background-color: var(--bg-control);
  color: var(--text-primary);
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  outline: none;
}

.navbar select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%23f8fafc'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2.5' d='M19 9l-7 7-7-7'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  background-size: 1rem;
  padding-right: 2.2rem;
}

.navbar a:hover,
.navbar select:hover:not(:disabled) {
  background-color: #475569;
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-1px);
}

.navbar a:active {
  transform: translateY(0);
}

/* Primary buttons (Sort and Generate) */
.navbar a#random {
  background-color: var(--primary);
  border: none;
}

.navbar a#random:hover:not(.disabled) {
  background-color: var(--primary-hover);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.navbar a.start {
  background-color: var(--accent);
  border: none;
  font-weight: 600;
}

.navbar a.start:hover:not(.disabled) {
  background-color: #0891b2;
  box-shadow: 0 4px 12px rgba(6, 182, 212, 0.3);
}

/* Control Buttons (Pause, Stop, Audio) */
.navbar a.control-btn {
  border: none;
  font-weight: 600;
}

.navbar a#pause-btn {
  background-color: #d97706; /* Amber 600 */
}

.navbar a#pause-btn:hover:not(.disabled) {
  background-color: #b45309;
  box-shadow: 0 4px 12px rgba(217, 119, 6, 0.3);
}

.navbar a#cancel-btn {
  background-color: #dc2626; /* Red 600 */
}

.navbar a#cancel-btn:hover:not(.disabled) {
  background-color: #b91c1c;
  box-shadow: 0 4px 12px rgba(220, 38, 38, 0.3);
}

.navbar a#audio-toggle {
  background-color: transparent;
  border: none;
  font-size: 1.2rem;
  padding: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.navbar a#audio-toggle:hover {
  color: var(--accent);
  background: rgba(255, 255, 255, 0.05);
}

.navbar a.control-btn.hidden {
  display: none !important;
}

/* Disabled State Styling */
.navbar a.disabled,
.navbar select:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
  box-shadow: none !important;
  background-color: var(--bg-card) !important;
  border-color: rgba(255, 255, 255, 0.05) !important;
}

/* Grid layout for Visualizer Canvas and Interactive Dashboard */
.main-layout {
  display: flex;
  gap: 2rem;
  width: 90%;
  max-width: 1300px;
  margin: 2rem auto;
  align-items: stretch;
}

/* Visualizer Container (Left Column) */
.center {
  flex: 3;
  height: 480px;
  background: rgba(30, 41, 59, 0.45);
  backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 16px;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.25), 0 10px 10px -5px rgba(0, 0, 0, 0.2);
  display: flex;
  justify-content: center;
  align-items: flex-end;
  overflow: hidden;
}

.array {
  display: flex;
  align-items: flex-end; /* Grows bars upwards from bottom */
  justify-content: center;
  width: 100%;
  height: 100%;
  padding: 1.5rem;
  gap: 3px;
}

/* Bar (Cell) styling */
.cell {
  flex: 1;
  background-color: var(--cell-default);
  border-radius: 4px 4px 0 0;
  transition: height 0.15s ease-out, background-color 0.1s ease-in-out;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  color: rgba(255, 255, 255, 0.95);
  font-size: 0.75rem;
  font-weight: 700;
  padding-bottom: 0.4rem;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.6);
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

/* Dashboard Panel (Right Column) */
.dashboard {
  flex: 2;
  background: rgba(30, 41, 59, 0.45);
  backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 16px;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.25);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  height: 480px;
}

/* Tabs Styling */
.tabs-container {
  display: flex;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(15, 23, 42, 0.3);
}

.tab-btn {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-muted);
  padding: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  font-size: 0.9rem;
  outline: none;
}

.tab-btn:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.02);
}

.tab-btn.active {
  color: var(--accent);
  border-bottom: 2px solid var(--accent);
  background: rgba(255, 255, 255, 0.04);
}

/* Tab Content */
.tab-content {
  padding: 1.5rem;
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.tab-content.hidden {
  display: none !important;
}

/* Stats Tab */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.stat-card {
  background: rgba(15, 23, 42, 0.4);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 10px;
  padding: 1.1rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.02);
}

.stat-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
}

.stat-value {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

/* Custom Array Input Container */
.custom-input-container {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  background: rgba(15, 23, 42, 0.4);
  padding: 1rem;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.05);
  margin-top: auto;
}

.custom-input-title {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.custom-input-row {
  display: flex;
  gap: 0.5rem;
}

.custom-input-row input {
  flex: 1;
  background: var(--bg-dark);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 6px;
  padding: 0.5rem 0.75rem;
  color: var(--text-primary);
  outline: none;
  font-size: 0.85rem;
  transition: border-color 0.2s;
}

.custom-input-row input:focus {
  border-color: var(--accent);
}

.custom-input-row button {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 0.5rem 1rem;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.85rem;
  transition: background-color 0.2s;
}

.custom-input-row button:hover {
  background-color: #0891b2;
}

/* Info Tab styling */
.info-section {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.info-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.complexity-table {
  width: 100%;
  border-collapse: collapse;
  margin: 0.5rem 0;
  background: rgba(15, 23, 42, 0.2);
  border-radius: 8px;
  overflow: hidden;
}

.complexity-table th, 
.complexity-table td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  font-size: 0.9rem;
}

.complexity-table th {
  color: var(--text-muted);
  font-weight: 600;
  background: rgba(15, 23, 42, 0.4);
}

.complexity-badge {
  font-family: 'Courier New', Courier, monospace;
  font-weight: 700;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  font-size: 0.85rem;
}

.complexity-badge.best {
  background: rgba(16, 185, 129, 0.12);
  color: #34d399;
}

.complexity-badge.avg {
  background: rgba(245, 158, 11, 0.12);
  color: #fbbf24;
}

.complexity-badge.worst {
  background: rgba(239, 68, 68, 0.12);
  color: #fca5a5;
}

.complexity-badge.space {
  background: rgba(6, 182, 212, 0.12);
  color: #22d3ee;
}

.info-description {
  font-size: 0.9rem;
  line-height: 1.55;
  color: var(--text-muted);
}

/* Code Tab styling */
.code-container {
  background: #090d16;
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 10px;
  padding: 1rem;
  overflow: auto;
  max-height: 330px;
  box-shadow: inset 0 2px 8px rgba(0,0,0,0.8);
}

.code-container pre {
  margin: 0;
}

.code-container code {
  font-family: 'Courier New', Courier, monospace;
  font-size: 0.85rem;
  line-height: 1.45;
  color: #38bdf8; /* Soft blue */
}

/* Responsive navigation menu toggle button */
.navbar .icon {
  display: none;
}

/* Footer Styling */
footer.footer {
  background: rgba(15, 23, 42, 0.9);
  padding: 1.5rem;
  text-align: center;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  font-size: 0.9rem;
  color: var(--text-muted);
}

footer.footer p {
  letter-spacing: 0.025em;
}

/* Media Queries for Responsiveness */
@media (max-width: 900px) {
  .main-layout {
    flex-direction: column;
    margin: 1rem auto;
  }
  
  .center, 
  .dashboard {
    flex: none;
    width: 100%;
    height: 400px;
  }
}

@media (max-width: 768px) {
  .nav-container {
    flex-direction: column;
    padding: 1rem;
    gap: 1rem;
  }
  
  .navbar {
    width: 100%;
    justify-content: center;
    flex-wrap: wrap;
  }
  
  .cell {
    font-size: 0.65rem;
    padding-bottom: 0.2rem;
  }
}