/* ==========================================================================
   KeyFlow AI Typing — Production Design System & Styles
   Obsidian Glass & Cyber-Slate Theme
   ========================================================================== */

:root {
  /* Surface Elevation (Deep Obsidian Dark) */
  --bg: #070913;
  --surface-0: rgba(10, 15, 29, 0.7);
  --surface-1: rgba(16, 24, 46, 0.75);
  --surface-2: rgba(22, 33, 62, 0.85);
  --surface-3: rgba(30, 45, 82, 0.95);
  --surface-elevated: #151f38;
  
  /* Text & Tone Hierarchy */
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #8292aa;
  --text-disabled: #475569;
  
  /* Borders & Dividers */
  --border-subtle: rgba(255, 255, 255, 0.06);
  --border-medium: rgba(255, 255, 255, 0.12);
  --border-strong: rgba(255, 255, 255, 0.2);
  --border-focus: rgba(99, 102, 241, 0.6);
  
  /* Vibrant Accents */
  --brand: #6366f1;         /* Electric Indigo */
  --brand-light: #818cf8;
  --brand-dark: #4f46e5;
  --brand-glow: rgba(99, 102, 241, 0.35);
  
  --accent-purple: #a855f7;  /* Cyber Violet */
  --accent-cyan: #06b6d4;    /* Electric Cyan */
  --accent-green: #10b981;   /* Emerald Success */
  --accent-amber: #f59e0b;   /* Amber Warning */
  --accent-rose: #f43f5e;    /* Rose Danger / Error */
  
  --gradient-brand: linear-gradient(135deg, #6366f1 0%, #a855f7 50%, #ec4899 100%);
  --gradient-surface: linear-gradient(180deg, rgba(255, 255, 255, 0.04) 0%, rgba(255, 255, 255, 0) 100%);
  --gradient-glass: linear-gradient(135deg, rgba(255, 255, 255, 0.08) 0%, rgba(255, 255, 255, 0.02) 100%);
  
  /* Shadows & Depth */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-sm: 0 4px 8px -2px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 10px 24px -4px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 20px 48px -8px rgba(0, 0, 0, 0.65);
  --shadow-glow: 0 0 24px var(--brand-glow);
  
  /* Radii */
  --radius-xs: 6px;
  --radius-sm: 10px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  /* Glass Blur */
  --blur: blur(20px) saturate(180%);
  --blur-light: blur(12px);
  
  /* Transition Timing */
  --ease-spring: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: 150ms var(--ease-smooth);
  --transition-normal: 240ms var(--ease-smooth);
  --transition-spring: 350ms var(--ease-spring);
}

/* Light Theme Variables */
body.light {
  --bg: #f3f5f9;
  --surface-0: rgba(255, 255, 255, 0.7);
  --surface-1: rgba(255, 255, 255, 0.85);
  --surface-2: rgba(243, 246, 252, 0.95);
  --surface-3: #ffffff;
  --surface-elevated: #ffffff;
  
  --text-primary: #090e1a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --text-disabled: #94a3b8;
  
  --border-subtle: rgba(15, 23, 42, 0.06);
  --border-medium: rgba(15, 23, 42, 0.12);
  --border-strong: rgba(15, 23, 42, 0.2);
  --border-focus: rgba(99, 102, 241, 0.7);
  
  --shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.05);
  --shadow-sm: 0 4px 10px -2px rgba(15, 23, 42, 0.07);
  --shadow-md: 0 12px 24px -4px rgba(15, 23, 42, 0.1);
  --shadow-lg: 0 24px 48px -8px rgba(15, 23, 42, 0.14);
}

/* Base Reset & Typography */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body, #app {
  height: 100%;
  min-height: 100%;
}

body {
  font-family: 'Plus Jakarta Sans', 'Inter', system-ui, -apple-system, sans-serif;
  background-color: var(--bg);
  background-image: 
    radial-gradient(ellipse at top left, rgba(99, 102, 241, 0.18) 0%, transparent 50%),
    radial-gradient(ellipse at bottom right, rgba(168, 85, 247, 0.12) 0%, transparent 45%),
    radial-gradient(circle at 50% 10%, rgba(6, 182, 212, 0.06) 0%, transparent 40%);
  background-attachment: fixed;
  color: var(--text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  user-select: none;
  transition: background-color 0.4s ease, color 0.4s ease;
}

button, input, select, textarea {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  outline: none;
}

a {
  color: inherit;
  text-decoration: none;
}

/* App Shell Architecture */
.app-shell {
  display: grid;
  grid-template-columns: 240px 1fr;
  height: 100vh;
  overflow: hidden;
}

/* Sidebar Navigation */
.sidebar {
  background: var(--surface-0);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  padding: 18px 14px;
  z-index: 20;
  height: 100vh;
  overflow-y: auto;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 10px 22px;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 16px;
}

.brand-mark {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--surface-1);
  border: 1px solid var(--border-medium);
  backdrop-filter: var(--blur-light);
  -webkit-backdrop-filter: var(--blur-light);
  display: grid;
  place-items: center;
  box-shadow: 0 4px 16px var(--brand-glow);
  flex-shrink: 0;
  transition: transform var(--transition-spring), box-shadow var(--transition-fast), border-color var(--transition-fast);
}

.brand:hover .brand-mark {
  transform: scale(1.08) rotate(3deg);
  border-color: var(--brand-light);
  box-shadow: 0 0 20px var(--brand-glow);
}

.brand-title {
  font-family: 'Outfit', sans-serif;
  font-weight: 800;
  font-size: 20px;
  letter-spacing: -0.03em;
  line-height: 1.1;
  color: var(--text-primary);
}

.brand-title span {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-tag {
  font-size: 9.5px;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  margin-top: 4px;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.2);
  width: fit-content;
}

.brand-tag-dot {
  width: 6px;
  height: 6px;
  border-radius: var(--radius-full);
  background: var(--accent-green);
  box-shadow: 0 0 8px var(--accent-green);
}

/* Nav Menu */
.nav-menu {
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
}

.nav-section-title {
  font-size: 10px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  padding: 10px 10px 4px;
  opacity: 0.75;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 13.5px;
  font-weight: 600;
  transition: all var(--transition-fast);
  position: relative;
}

.nav-item:hover {
  background: var(--surface-2);
  color: var(--text-primary);
  transform: translateX(3px);
}

.nav-item.active {
  background: var(--surface-2);
  color: var(--text-primary);
  font-weight: 700;
  border: 1px solid var(--border-medium);
  box-shadow: var(--shadow-xs);
}

.nav-item.active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 3.5px;
  border-radius: 0 var(--radius-xs) var(--radius-xs) 0;
  background: var(--brand);
  box-shadow: 0 0 10px var(--brand);
}

.nav-icon {
  width: 20px;
  height: 20px;
  display: grid;
  place-items: center;
  font-size: 15px;
  color: var(--text-muted);
  transition: color var(--transition-fast);
  flex-shrink: 0;
}

.nav-item.active .nav-icon,
.nav-item:hover .nav-icon {
  color: var(--brand-light);
}

.nav-shortcut {
  margin-left: auto;
  font-size: 10px;
  font-weight: 700;
  color: var(--text-muted);
  padding: 2px 5px;
  border-radius: 4px;
  border: 1px solid var(--border-subtle);
  background: rgba(255, 255, 255, 0.03);
}

/* Sidebar Footer Profile & Safety */
.sidebar-footer {
  margin-top: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-top: 14px;
  border-top: 1px solid var(--border-subtle);
}

.local-shield {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  background: rgba(16, 185, 129, 0.08);
  border: 1px solid rgba(16, 185, 129, 0.2);
  color: var(--accent-green);
  font-size: 11px;
  font-weight: 700;
}

.user-profile-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px;
  border-radius: var(--radius-sm);
  background: var(--surface-1);
  border: 1px solid var(--border-subtle);
}

.user-avatar {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  background: var(--gradient-brand);
  color: #fff;
  font-weight: 800;
  font-size: 12px;
  display: grid;
  place-items: center;
  flex-shrink: 0;
}

.user-info {
  flex: 1;
  min-width: 0;
}

.user-name {
  font-size: 12.5px;
  font-weight: 700;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.user-role {
  font-size: 10.5px;
  color: var(--text-muted);
}

/* Main Content Area */
.main-viewport {
  height: 100vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  position: relative;
  background: transparent;
}

/* Modern Top HUD Bar */
.top-hud {
  position: sticky;
  top: 0;
  z-index: 15;
  background: var(--surface-0);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border-bottom: 1px solid var(--border-subtle);
  padding: 12px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.hud-breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
}

.hud-page-title {
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  font-size: 16px;
  color: var(--text-primary);
}

.hud-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.cmd-trigger-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  background: var(--surface-1);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  font-size: 12px;
  font-weight: 600;
  transition: all var(--transition-fast);
}

.cmd-trigger-btn:hover {
  background: var(--surface-2);
  color: var(--text-primary);
  border-color: var(--border-medium);
}

.kbd {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  font-weight: 700;
  padding: 2px 5px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
}

/* Primary Page Container */
.page-container {
  padding: 24px 32px 48px;
  max-width: 1360px;
  width: 100%;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* Card System */
.kf-card {
  background: var(--surface-1);
  backdrop-filter: var(--blur-light);
  -webkit-backdrop-filter: var(--blur-light);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  position: relative;
  box-shadow: var(--shadow-sm);
  transition: background-color 0.4s ease, border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.kf-card:hover {
  border-color: var(--border-medium);
}

.kf-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
}

.kf-card-title {
  font-family: 'Outfit', sans-serif;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.kf-card-subtitle {
  font-size: 12.5px;
  color: var(--text-muted);
  margin-top: 2px;
}

/* Metric / Stat Tiles */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 14px;
}

.stat-tile {
  background: var(--surface-1);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.stat-tile::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-brand);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.stat-tile:hover {
  transform: translateY(-2px);
  border-color: var(--border-medium);
  box-shadow: var(--shadow-md);
}

.stat-tile:hover::before {
  opacity: 1;
}

.stat-label {
  font-size: 11.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

.stat-value {
  font-family: 'Outfit', sans-serif;
  font-size: 28px;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin: 2px 0;
}

.stat-sub {
  font-size: 11.5px;
  color: var(--text-muted);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 16px;
  border-radius: var(--radius-sm);
  font-size: 13.5px;
  font-weight: 700;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-brand);
  color: #ffffff;
  box-shadow: 0 4px 14px var(--brand-glow);
}

.btn-primary:hover {
  opacity: 0.95;
  transform: translateY(-1px);
  box-shadow: 0 6px 20px var(--brand-glow);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background: var(--surface-2);
  border: 1px solid var(--border-medium);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background: var(--surface-3);
  border-color: var(--border-strong);
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
}

.btn-ghost:hover {
  background: var(--surface-2);
  color: var(--text-primary);
}

.btn-sm {
  padding: 6px 12px;
  font-size: 12px;
}

.btn-lg {
  padding: 12px 24px;
  font-size: 15px;
  border-radius: var(--radius-md);
}

/* Status Badges & Pills */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.03em;
  background: var(--surface-2);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
}

.badge-brand {
  background: rgba(99, 102, 241, 0.12);
  border-color: rgba(99, 102, 241, 0.35);
  color: var(--brand-light);
}

.badge-success {
  background: rgba(16, 185, 129, 0.12);
  border-color: rgba(16, 185, 129, 0.35);
  color: var(--accent-green);
}

.badge-warning {
  background: rgba(245, 158, 11, 0.12);
  border-color: rgba(245, 158, 11, 0.35);
  color: var(--accent-amber);
}

.badge-danger {
  background: rgba(244, 63, 94, 0.14);
  border-color: rgba(244, 63, 94, 0.4);
  color: var(--accent-rose);
}

.badge-purple {
  background: rgba(168, 85, 247, 0.14);
  border-color: rgba(168, 85, 247, 0.35);
  color: var(--accent-purple);
}

/* ==========================================================================
   Practice View: Zen Typing Studio
   ========================================================================== */
.practice-studio {
  max-width: 1080px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* Top Studio Control Bar */
.studio-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.studio-title-block h1 {
  font-family: 'Outfit', sans-serif;
  font-size: 26px;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.studio-title-block p {
  font-size: 13px;
  color: var(--text-muted);
}

.mode-badges-row {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 4px;
}

/* Live Telemetry Glass HUD */
.live-telemetry-hud {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  background: var(--surface-1);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 12px 18px;
  box-shadow: var(--shadow-sm);
}

.live-hud-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  border-right: 1px solid var(--border-subtle);
}

.live-hud-stat:last-child {
  border-right: none;
}

.live-hud-label {
  font-size: 10.5px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
}

.live-hud-value {
  font-family: 'Outfit', sans-serif;
  font-size: 24px;
  font-weight: 900;
  color: var(--text-primary);
  line-height: 1.1;
  margin-top: 2px;
}

.live-hud-value.acc-green { color: var(--accent-green); }
.live-hud-value.acc-yellow { color: var(--accent-amber); }
.live-hud-value.acc-red { color: var(--accent-rose); }

/* Paragraph Tabs */
.passage-tabs-row {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.passage-tab-btn {
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  background: var(--surface-1);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  font-size: 12px;
  font-weight: 700;
  transition: all var(--transition-fast);
}

.passage-tab-btn:hover {
  background: var(--surface-2);
  color: var(--text-primary);
}

.passage-tab-btn.active {
  background: rgba(99, 102, 241, 0.16);
  border-color: var(--brand);
  color: var(--brand-light);
}

/* Typing Canvas Box */
.typing-canvas-wrapper {
  position: relative;
  background: var(--surface-0);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  padding: 32px 36px;
  min-height: 190px;
  max-height: 380px;
  overflow-y: auto;
  box-shadow: var(--shadow-md);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.focus-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  border-radius: var(--radius-lg);
}

.focus-overlay span {
  font-family: 'Outfit', sans-serif;
  font-size: 18px;
  font-weight: 700;
  color: #fff;
  background: var(--gradient-brand);
  padding: 8px 16px;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.5);
  animation: pulse-glow 2s infinite;
}

@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 10px var(--brand-glow); }
  50% { box-shadow: 0 0 20px var(--brand); }
}

.blind-mode span.word {
  filter: blur(4px);
  opacity: 0.6;
  transition: filter 0.2s ease, opacity 0.2s ease;
}

.blind-mode span.word:has(.current) {
  filter: blur(0);
  opacity: 1;
}

.typing-canvas-wrapper.focused {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--brand-glow), var(--shadow-lg);
}

.prompt {
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 24px;
  line-height: 1.8;
  letter-spacing: 0.015em;
  color: var(--text-muted);
  position: relative;
  outline: none;
}

.prompt .word {
  display: inline-block;
  white-space: nowrap;
  margin-right: 0.35em;
}

.prompt .paragraph-break {
  display: block;
  height: 22px;
  margin: 10px 0;
  border-bottom: 1px dashed var(--border-subtle);
}

.prompt .done {
  color: var(--text-primary);
  font-weight: 500;
}

.prompt .current {
  background: rgba(99, 102, 241, 0.35);
  color: #ffffff;
  border-radius: 4px;
  position: relative;
  font-weight: 700;
  box-shadow: 0 0 12px var(--brand-glow);
}

.prompt .current::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 100%;
  height: 3px;
  background: var(--brand);
  animation: pulseCaret 1s ease-in-out infinite;
}

@keyframes pulseCaret {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.2; }
}

.prompt .bad {
  color: var(--accent-rose);
  background: rgba(244, 63, 94, 0.22);
  border-radius: 4px;
  text-decoration: underline wavy var(--accent-rose);
  text-underline-offset: 4px;
}

.prompt .pending {
  color: var(--text-disabled);
  opacity: 0.7;
}

/* Blind Mode Styling */
.prompt.blind-mode .done,
.prompt.blind-mode .bad {
  opacity: 0.12;
  filter: blur(2.5px);
  transition: opacity 0.3s ease;
}

.prompt.blind-mode .current {
  color: var(--text-primary);
}

/* Ghost Pace Caret */
.pace-caret {
  position: absolute;
  width: 3.5px;
  height: 1.55em;
  background: var(--accent-cyan);
  border-radius: 2px;
  box-shadow: 0 0 10px var(--accent-cyan);
  opacity: 0.8;
  pointer-events: none;
  transition: left 0.1s linear, top 0.1s linear;
  z-index: 10;
}

/* Ghost Racing Simulation Track */
.ghost-racing-track {
  background: var(--surface-1);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  margin-bottom: 14px;
  backdrop-filter: var(--blur-light);
  -webkit-backdrop-filter: var(--blur-light);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.race-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.race-lane {
  position: relative;
  height: 26px;
  background: var(--surface-2);
  border-radius: var(--radius-full);
  overflow: hidden;
  border: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
}

.race-lane-grid {
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(90deg, transparent, transparent 38px, rgba(255, 255, 255, 0.04) 38px, rgba(255, 255, 255, 0.04) 40px);
}

.race-runner {
  position: absolute;
  top: 50%;
  transform: translateY(-50%) translateX(-50%);
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 16px;
  transition: left 0.12s cubic-bezier(0.2, 0.8, 0.2, 1);
  z-index: 5;
}

.race-runner.player {
  filter: drop-shadow(0 0 8px #00f2fe);
}

.race-runner.ghost {
  filter: drop-shadow(0 0 8px #c084fc);
  opacity: 0.85;
}

.race-finish-flag {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 14px;
  opacity: 0.7;
}

.race-delta-badge {
  font-size: 11px;
  font-weight: 800;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.delta-ahead {
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-green);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.delta-behind {
  background: rgba(244, 63, 94, 0.15);
  color: var(--accent-rose);
  border: 1px solid rgba(244, 63, 94, 0.3);
}

/* Mechanical Visual Keyboard Guide */
.keyboard-section {
  background: var(--surface-1);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 16px 20px 20px;
  box-shadow: var(--shadow-sm);
}

.keyboard-rows-container {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: 10px;
}

.keyboard-row {
  display: flex;
  justify-content: center;
  gap: 6px;
}

.keycap {
  min-width: 44px;
  height: 44px;
  padding: 6px 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  background: var(--surface-2);
  border: 1px solid var(--border-medium);
  border-bottom-width: 3px;
  border-bottom-color: rgba(0, 0, 0, 0.4);
  color: var(--text-muted);
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  font-weight: 700;
  transition: all 0.08s ease;
  user-select: none;
}

.keycap:active, .keycap.active {
  transform: translateY(2px);
  border-bottom-width: 1px;
  background: rgba(99, 102, 241, 0.25);
  border-color: var(--brand);
  color: #fff;
  box-shadow: 0 0 14px var(--brand-glow);
}

.keycap.next {
  border-color: var(--brand);
  background: rgba(99, 102, 241, 0.18);
  color: #ffffff;
  box-shadow: 0 0 14px var(--brand-glow);
  animation: keycapGlow 1.5s infinite alternate;
}

@keyframes keycapGlow {
  from { box-shadow: 0 0 6px var(--brand-glow); }
  to { box-shadow: 0 0 16px var(--brand); }
}

.keycap.wide { min-width: 74px; }
.keycap.space { min-width: 280px; }

/* Metronome Pulse Indicator */
.metronome-pulse {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
  background: var(--accent-cyan);
  transition: transform 0.1s ease, box-shadow 0.1s ease;
}

.metronome-pulse.beat {
  transform: scale(1.6);
  box-shadow: 0 0 12px var(--accent-cyan);
}

/* ==========================================================================
   Interactive QWERTY Heatmap & Analytics
   ========================================================================== */
.heatmap-card {
  background: var(--surface-1);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.heatmap-grid {
  display: flex;
  flex-direction: column;
  gap: 7px;
  margin: 16px 0 12px;
}

.heatmap-row {
  display: flex;
  justify-content: center;
  gap: 7px;
}

.hm-key {
  min-width: 48px;
  height: 52px;
  padding: 6px 4px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  border-radius: 10px;
  border: 1px solid var(--border-subtle);
  background: var(--surface-2);
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
}

.hm-key:hover {
  transform: translateY(-3px) scale(1.05);
  z-index: 5;
  box-shadow: var(--shadow-md);
  border-color: var(--border-strong);
}

.hm-key b {
  font-family: 'JetBrains Mono', monospace;
  font-size: 14px;
  font-weight: 800;
}

.hm-key small {
  font-size: 9.5px;
  font-weight: 700;
  opacity: 0.85;
}

.hm-key.excellent {
  background: rgba(16, 185, 129, 0.15);
  border-color: rgba(16, 185, 129, 0.45);
  color: #34d399;
}

.hm-key.good {
  background: rgba(99, 102, 241, 0.14);
  border-color: rgba(99, 102, 241, 0.35);
  color: #a5b4fc;
}

.hm-key.warning {
  background: rgba(245, 158, 11, 0.18);
  border-color: rgba(245, 158, 11, 0.5);
  color: #fbbf24;
}

.hm-key.critical {
  background: rgba(244, 63, 94, 0.22);
  border-color: rgba(244, 63, 94, 0.6);
  color: #fda4af;
  animation: criticalPulse 2s infinite;
}

@keyframes criticalPulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(244, 63, 94, 0.4); }
  50% { box-shadow: 0 0 16px 2px rgba(244, 63, 94, 0.4); }
}

.hm-key.untested {
  background: var(--surface-0);
  border-color: var(--border-subtle);
  color: var(--text-disabled);
}

.hm-space-key {
  min-width: 260px;
}

/* Heatmap Legend */
.heatmap-legend-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 14px;
  font-size: 11.5px;
  color: var(--text-muted);
}

.legend-dot {
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
  display: inline-block;
  margin-right: 4px;
}

/* Key Inspection Detail Drawer */
.key-detail-drawer {
  background: var(--surface-2);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin-top: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  animation: slideInDown 0.2s var(--ease-spring);
}

@keyframes slideInDown {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* WPM Trajectory Chart Bars */
.chart-container {
  height: 200px;
  display: flex;
  align-items: flex-end;
  gap: 8px;
  padding: 24px 4px 4px;
}

.chart-bar-col {
  flex: 1;
  max-width: 48px;
  background: var(--gradient-brand);
  border-radius: 6px 6px 2px 2px;
  min-height: 8px;
  position: relative;
  transition: transform var(--transition-fast);
}

.chart-bar-col:hover {
  transform: scaleY(1.05);
  filter: brightness(1.15);
}

.chart-bar-top {
  position: absolute;
  top: -20px;
  width: 100%;
  text-align: center;
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  font-weight: 700;
  color: var(--text-secondary);
}

.chart-bar-bottom {
  position: absolute;
  bottom: -20px;
  width: 100%;
  text-align: center;
  font-size: 10px;
  color: var(--text-muted);
}

/* ==========================================================================
   AI Coach Copilot Card
   ========================================================================== */
.copilot-card {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.12) 0%, rgba(168, 85, 247, 0.06) 100%), var(--surface-1);
  border: 1px solid rgba(99, 102, 241, 0.3);
  border-radius: var(--radius-lg);
  padding: 22px 26px;
  position: relative;
  overflow: hidden;
  box-shadow: 0 10px 30px -5px rgba(99, 102, 241, 0.15);
}

.copilot-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-brand);
}

.copilot-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.copilot-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--brand-light);
}

.copilot-body {
  display: flex;
  gap: 18px;
  align-items: flex-start;
}

.copilot-avatar {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--gradient-brand);
  display: grid;
  place-items: center;
  color: #fff;
  font-size: 20px;
  font-weight: 900;
  box-shadow: 0 4px 16px var(--brand-glow);
  flex-shrink: 0;
}

.copilot-message {
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--text-primary);
  font-weight: 500;
}

.copilot-trace-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 14px;
}

/* ==========================================================================
   Command Palette Spotlight Modal (Ctrl+K)
   ========================================================================== */
.cmd-palette-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(7, 9, 19, 0.75);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  z-index: 100;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 12vh;
  animation: fadeIn 0.15s ease;
}

.cmd-palette-modal {
  width: min(640px, 92vw);
  background: var(--surface-elevated);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg), 0 0 40px var(--brand-glow);
  overflow: hidden;
  animation: popIn 0.2s var(--ease-spring);
}

@keyframes popIn {
  from { opacity: 0; transform: scale(0.96) translateY(-10px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

.cmd-search-input-wrapper {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-subtle);
  background: var(--surface-2);
}

.cmd-search-icon {
  color: var(--brand-light);
  font-size: 18px;
}

.cmd-search-input {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-size: 16px;
  font-weight: 600;
  outline: none;
}

.cmd-results-list {
  max-height: 380px;
  overflow-y: auto;
  padding: 10px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.cmd-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--transition-fast);
  color: var(--text-secondary);
}

.cmd-item:hover, .cmd-item.selected {
  background: var(--surface-2);
  color: var(--text-primary);
}

.cmd-item-left {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 14px;
  font-weight: 600;
}

.cmd-item-icon {
  font-size: 16px;
  color: var(--text-muted);
}

.cmd-item.selected .cmd-item-icon {
  color: var(--brand-light);
}

/* ==========================================================================
   Table & Form Elements
   ========================================================================== */
.kf-table {
  width: 100%;
  border-collapse: collapse;
}

.kf-table th, .kf-table td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--border-subtle);
  text-align: left;
  font-size: 13.5px;
}

.kf-table th {
  font-size: 11px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.kf-table tr:hover td {
  background: rgba(255, 255, 255, 0.02);
}

.form-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 14px;
}

.form-label {
  font-size: 11.5px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

.form-input, .form-select {
  width: 100%;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  font-size: 14px;
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus, .form-select:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--brand-glow);
}

/* Toast Notifications */
.toast {
  display: none;
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--surface-elevated);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  padding: 12px 20px;
  color: var(--text-primary);
  font-size: 13.5px;
  font-weight: 700;
  box-shadow: var(--shadow-lg);
  z-index: 200;
  animation: toastSlideUp 0.3s var(--ease-spring);
}

@keyframes toastSlideUp {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Helper Utilities */
.text-brand { color: var(--brand-light); }
.text-green { color: var(--accent-green); }
.text-amber { color: var(--accent-amber); }
.text-rose { color: var(--accent-rose); }
.text-muted { color: var(--text-muted); }
.font-mono { font-family: 'JetBrains Mono', monospace; }

/* ==========================================================================
   Cyber Matrix Arcade Combat Studio
   ========================================================================== */
.arcade-studio-layout {
  display: flex;
  flex-direction: column;
  gap: 14px;
  max-width: 1100px;
  margin: 0 auto;
}

.arcade-hud-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  background: var(--surface-1);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  gap: 16px;
}

.arcade-hud-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.arcade-title-tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--brand-light);
  display: flex;
  align-items: center;
  gap: 6px;
}

.pulse-radar {
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
  background: var(--accent-cyan);
  box-shadow: 0 0 10px var(--accent-cyan);
  animation: radarPulse 1.2s infinite;
}

@keyframes radarPulse {
  0% { transform: scale(0.9); opacity: 0.7; }
  50% { transform: scale(1.4); opacity: 1; }
  100% { transform: scale(0.9); opacity: 0.7; }
}

.arcade-wave-pill {
  padding: 4px 12px;
  border-radius: var(--radius-full);
  background: rgba(99, 102, 241, 0.18);
  border: 1px solid var(--brand);
  color: #ffffff;
  font-family: 'Outfit', sans-serif;
  font-size: 13px;
  font-weight: 800;
}

.arcade-hud-center {
  display: flex;
  align-items: center;
  gap: 24px;
}

.arcade-stat-group {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.arcade-stat-lbl {
  font-size: 9.5px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.arcade-stat-val {
  font-family: 'JetBrains Mono', monospace;
  font-size: 18px;
  font-weight: 800;
  line-height: 1.1;
  margin-top: 2px;
}

.arcade-hud-right {
  display: flex;
  align-items: center;
  gap: 18px;
}

.arcade-shield-cells {
  display: flex;
  gap: 4px;
  margin-top: 3px;
}

.shield-cell {
  width: 18px;
  height: 8px;
  border-radius: 2px;
  background: var(--surface-3);
  border: 1px solid var(--border-subtle);
  transition: all var(--transition-fast);
}

.shield-cell.active {
  background: var(--accent-green);
  box-shadow: 0 0 8px var(--accent-green);
  border-color: var(--accent-green);
}

.shield-cell.depleted {
  background: rgba(244, 63, 94, 0.2);
  border-color: rgba(244, 63, 94, 0.4);
}

.emp-meter {
  width: 70px;
  height: 8px;
  border-radius: 4px;
  background: var(--surface-3);
  border: 1px solid var(--border-subtle);
  overflow: hidden;
  margin-top: 3px;
}

.emp-fill {
  height: 100%;
  background: linear-gradient(90deg, #f59e0b, #ec4899);
  transition: width 0.2s ease;
  box-shadow: 0 0 10px #f59e0b;
}

.arcade-canvas-wrapper {
  position: relative;
  width: 100%;
  height: 560px;
  background: #060812;
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg), 0 0 40px rgba(99, 102, 241, 0.15);
}

#arcadeCanvas {
  display: block;
  width: 100%;
  height: 100%;
}

.arcade-overlay-start {
  position: absolute;
  inset: 0;
  background: rgba(6, 8, 18, 0.82);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  z-index: 10;
  animation: fadeIn 0.2s ease;
}

.arcade-modal-card {
  max-width: 540px;
  width: 100%;
  background: var(--surface-elevated);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  text-align: center;
  box-shadow: var(--shadow-lg), 0 0 40px var(--brand-glow);
  animation: popIn 0.25s var(--ease-spring);
}

/* ==========================================================================
   Multi-Game Arcade Hub Grid & Mode Cards
   ========================================================================== */
.arcade-hub-container {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.arcade-mode-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 20px;
}

.arcade-mode-card {
  background: var(--surface-1);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  overflow: hidden;
  transition: all 0.25s var(--ease-spring);
  box-shadow: var(--shadow-sm);
}

.arcade-mode-card:hover {
  transform: translateY(-4px);
  border-color: var(--brand-light);
  box-shadow: var(--shadow-lg), 0 0 30px rgba(99, 102, 241, 0.2);
}

.arcade-mode-card.active-mode {
  border-color: var(--brand);
  background: linear-gradient(180deg, rgba(99, 102, 241, 0.1) 0%, var(--surface-1) 100%);
}

.arcade-mode-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 14px;
}

.arcade-mode-icon-box {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  background: var(--surface-2);
  border: 1px solid var(--border-medium);
  box-shadow: 0 0 16px rgba(0, 0, 0, 0.3);
}

.arcade-mode-title {
  font-family: 'Outfit', sans-serif;
  font-size: 20px;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.02em;
}

.arcade-mode-subtitle {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 600;
}

.arcade-mode-desc {
  font-size: 13.5px;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 18px;
}

.arcade-mode-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  background: var(--surface-2);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 12px;
  margin-bottom: 18px;
}

.arcade-mode-stat-item {
  display: flex;
  flex-direction: column;
}

.arcade-mode-stat-lbl {
  font-size: 10px;
  font-weight: 800;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

.arcade-mode-stat-val {
  font-family: 'JetBrains Mono', monospace;
  font-size: 16px;
  font-weight: 800;
  color: var(--brand-light);
  margin-top: 2px;
}

.arcade-mode-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 20px;
}