/* ==========================================================================
   NEURO-DRILL // STYLE SYSTEM
   Based on DESIGN QUALITY MASTER PROTOCOL 3.0 (i.DEZA Premium Standards)
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Design Tokens & Variables
   -------------------------------------------------------------------------- */
:root {
  /* Color Palette (60-30-10 Rule) */
  --bg-space: #050b14;         /* Base Color (60% Area) - Ultra Deep Blue-Black */
  --bg-glass-card: rgba(11, 15, 23, 0.4); /* Card Base */
  --bg-glass-element: rgba(255, 255, 255, 0.03);
  
  --text-primary: #ffffff;     /* Main Color (30% Area) */
  --text-secondary: #b4c6ef;   /* Muted Contrast (Increased brightness from #8fa0dd) */
  --text-muted: rgba(255, 255, 255, 0.55); /* Brighter muted text */
  
  /* Accent Colors (10% Area) - Split Complimentary Shines */
  --accent-cyan: #00f0ff;      /* Working Memory Glow */
  --accent-purple: #c48eff;    /* Executive Control Glow */
  --accent-emerald: #00ffc4;   /* Processing/Peripheral Speed Glow */
  --accent-coral: #ff6e87;     /* Warning/Error Red */
  
  /* Borders & Glass */
  --glass-border: rgba(255, 255, 255, 0.06);
  --glass-border-hover: rgba(255, 255, 255, 0.15);
  
  /* 8px Grid System spacing */
  --space-xxs: 8px;
  --space-xs: 16px;
  --space-sm: 24px;
  --space-md: 32px;
  --space-lg: 48px;
  --space-xl: 64px;
  --space-xxl: 80px;

  /* Typography Sizes */
  --font-size-h1: 32px;
  --font-size-h2: 24px;
  --font-size-h3: 20px;
  --font-size-body: 15px;
  
  /* Easings */
  --transition-premium: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

/* --------------------------------------------------------------------------
   2. Reset & General Settings
   -------------------------------------------------------------------------- */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg-space);
  color: var(--text-primary);
  font-family: 'Plus Jakarta Sans', 'Noto Serif JP', sans-serif;
  font-size: var(--font-size-body);
  line-height: 1.8;
  letter-spacing: 0.05em;
  overflow-x: hidden;
  min-height: 100vh;
  cursor: default; /* Master cursor rule */
}

main, section, div, span, p, h1, h2, h3, h4, h5, h6 {
  cursor: default;
}

/* --------------------------------------------------------------------------
   3. Interactive Cursor & Pointers Protocol (Strict Separation)
   -------------------------------------------------------------------------- */
button, 
select, 
option, 
kbd,
.cursor-trigger,
.grid-cell,
.schulte-cell,
.stroop-choice-btn {
  cursor: pointer !important; /* Functional Action Pointer */
}

input, textarea {
  cursor: text;
}

/* --------------------------------------------------------------------------
   4. Ambient Glows (Atmospheric Background)
   -------------------------------------------------------------------------- */
.glow-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -2;
  pointer-events: none;
  overflow: hidden;
}

.glow-cyan {
  position: absolute;
  top: -10%;
  left: -20%;
  width: 90vw;
  height: 90vw;
  background: radial-gradient(circle, rgba(0, 240, 255, 0.04) 0%, rgba(0,0,0,0) 70%);
  filter: blur(120px);
}

.glow-purple {
  position: absolute;
  bottom: -10%;
  right: -20%;
  width: 90vw;
  height: 90vw;
  background: radial-gradient(circle, rgba(196, 142, 255, 0.03) 0%, rgba(0,0,0,0) 70%);
  filter: blur(120px);
}

/* --------------------------------------------------------------------------
   5. Layout Structure
   -------------------------------------------------------------------------- */
.app-container {
  max-width: 1200px;
  margin: 0 auto;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding: var(--space-md) var(--space-xs);
}

.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-lg);
  border-bottom: 1px solid var(--glass-border);
  padding-bottom: var(--space-sm);
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.header-logo {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.logo-symbol {
  font-size: 36px;
  filter: drop-shadow(0 0 10px rgba(0, 240, 255, 0.3));
}

.logo-text h1 {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: var(--font-size-h2);
  font-weight: 800;
  letter-spacing: 4px;
  background: linear-gradient(135deg, #ffffff 0%, #8fa0dd 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.logo-subtitle {
  font-size: 9px;
  font-weight: 800;
  color: var(--text-secondary);
  letter-spacing: 3px;
  display: block;
}

/* Header Statistics Dashboard */
.header-stats {
  display: flex;
  gap: var(--space-xs);
}

.stat-box {
  background: var(--bg-glass-card);
  border: 1px solid var(--glass-border);
  padding: var(--space-xxs) var(--space-xs);
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  min-width: 120px;
  backdrop-filter: blur(10px);
  transition: var(--transition-premium);
}

.stat-box:hover {
  border-color: rgba(0, 240, 255, 0.2);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

.stat-label {
  font-size: 8px;
  font-weight: 800;
  color: var(--text-secondary);
  letter-spacing: 2px;
}

.stat-value {
  display: flex;
  align-items: baseline;
  gap: 2px;
}

.stat-value .number {
  font-size: var(--font-size-h2);
  font-weight: 800;
  color: #ffffff;
  font-family: 'Plus Jakarta Sans', sans-serif;
}

.stat-value .unit {
  font-size: 9px;
  color: var(--text-muted);
  font-weight: bold;
}

/* --------------------------------------------------------------------------
   6. Main Content Views (SPA)
   -------------------------------------------------------------------------- */
.app-main {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.view {
  display: none;
  opacity: 0;
  transform: translateY(10px);
  transition: var(--transition-premium);
}

.view.active {
  display: flex;
  flex-direction: column;
  opacity: 1;
  transform: translateY(0);
}

/* Dashboard Banner */
.welcome-banner {
  margin-bottom: var(--space-md);
  max-width: 800px;
}

.welcome-banner h2 {
  font-family: 'Noto Serif JP', serif;
  font-size: var(--font-size-h1);
  font-weight: 700;
  letter-spacing: 1px;
  background: linear-gradient(to right, #ffffff, #8fa0dd);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: var(--space-xxs);
}

.welcome-banner p {
  color: var(--text-secondary);
  font-size: var(--font-size-body);
  line-height: 1.8;
}

/* --------------------------------------------------------------------------
   7. Modules Grid (Dashboard)
   -------------------------------------------------------------------------- */
.modules-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-sm);
  margin-top: var(--space-xxs);
}

@media (max-width: 900px) {
  .modules-grid {
    grid-template-columns: 1fr;
  }
}

.module-card {
  background: var(--bg-glass-card);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  padding: var(--space-sm);
  backdrop-filter: blur(20px);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition-premium);
  position: relative;
  overflow: hidden;
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.03);
}

/* Atmospheric Glow on Hover */
.module-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  transition: var(--transition-premium);
}

.module-card.cyan-glow::after { background: var(--accent-cyan); opacity: 0.1; }
.module-card.purple-glow::after { background: var(--accent-purple); opacity: 0.1; }
.module-card.emerald-glow::after { background: var(--accent-emerald); opacity: 0.1; }

.module-card:hover {
  transform: translateY(-4px);
  border-color: var(--glass-border-hover);
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.4);
}

.module-card.cyan-glow:hover {
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.4), 0 0 30px rgba(0, 240, 255, 0.05);
  border-color: rgba(0, 240, 255, 0.25);
}

.module-card.purple-glow:hover {
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.4), 0 0 30px rgba(196, 142, 255, 0.05);
  border-color: rgba(196, 142, 255, 0.25);
}

.module-card.emerald-glow:hover {
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.4), 0 0 30px rgba(0, 255, 196, 0.05);
  border-color: rgba(0, 255, 196, 0.25);
}

.module-card.cyan-glow:hover::after,
.module-card.purple-glow:hover::after,
.module-card.emerald-glow:hover::after {
  opacity: 1;
}

.module-badge {
  font-size: 8px;
  font-weight: 800;
  letter-spacing: 3px;
  padding: 4px 10px;
  border-radius: 30px;
  border: 1px solid currentColor;
  display: inline-block;
  margin-bottom: var(--space-sm);
}

.cyan-glow .module-badge { color: var(--accent-cyan); background: rgba(0, 240, 255, 0.05); }
.purple-glow .module-badge { color: var(--accent-purple); background: rgba(196, 142, 255, 0.05); }
.emerald-glow .module-badge { color: var(--accent-emerald); background: rgba(0, 255, 196, 0.05); }

.module-card h3 {
  font-family: 'Noto Serif JP', serif;
  font-size: var(--font-size-h3);
  font-weight: 700;
  margin-bottom: var(--space-xxs);
  letter-spacing: 1px;
}

.module-desc {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-md);
  min-height: 80px;
}

.module-metrics {
  border-top: 1px solid var(--glass-border);
  padding-top: var(--space-xs);
  margin-bottom: var(--space-sm);
  display: flex;
  flex-direction: column;
  gap: var(--space-xxs);
}

.metric-item {
  font-size: 11px;
  color: var(--text-muted);
}

.metric-item strong {
  color: #ffffff;
  font-family: 'Plus Jakarta Sans', sans-serif;
  margin-left: var(--space-xxs);
}

/* Buttons */
.btn {
  background: var(--bg-glass-element);
  border: 1px solid var(--glass-border);
  color: var(--text-primary);
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 2px;
  padding: 14px 20px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  transition: var(--transition-premium);
  width: 100%;
}

.btn-cyan:hover {
  background: var(--accent-cyan);
  color: var(--bg-space);
  border-color: var(--accent-cyan);
  box-shadow: 0 8px 24px rgba(0, 240, 255, 0.25);
}

.btn-purple:hover {
  background: var(--accent-purple);
  color: var(--bg-space);
  border-color: var(--accent-purple);
  box-shadow: 0 8px 24px rgba(196, 142, 255, 0.25);
}

.btn-emerald:hover {
  background: var(--accent-emerald);
  color: var(--bg-space);
  border-color: var(--accent-emerald);
  box-shadow: 0 8px 24px rgba(0, 255, 196, 0.25);
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--glass-border);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--text-secondary);
}

/* --------------------------------------------------------------------------
   8. Game Screens Layout
   -------------------------------------------------------------------------- */
.game-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-md);
  gap: var(--space-xs);
  flex-wrap: wrap;
}

.btn-back {
  background: transparent;
  border: 1px solid var(--glass-border);
  border-radius: 30px;
  padding: 8px var(--space-xs);
  color: var(--text-secondary);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 2px;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition-fast);
}

.btn-back:hover {
  color: var(--text-primary);
  border-color: rgba(255,255,255,0.2);
  background: rgba(255,255,255,0.02);
}

.game-title-area {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.game-title-area h2 {
  font-size: var(--font-size-h2);
  font-weight: 800;
  letter-spacing: 2px;
}

.game-status-label {
  font-size: 9px;
  font-weight: 800;
  color: var(--text-secondary);
  letter-spacing: 2px;
}

.game-settings-inline {
  display: flex;
  align-items: center;
  gap: var(--space-xxs);
  background: var(--bg-glass-card);
  border: 1px solid var(--glass-border);
  padding: 6px 14px;
  border-radius: 30px;
}

.game-settings-inline label {
  font-size: 11px;
  font-weight: bold;
  color: var(--text-secondary);
}

.game-settings-inline select {
  background: transparent;
  border: none;
  color: #ffffff;
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 11px;
  font-weight: bold;
  outline: none;
}

.game-settings-inline select option {
  background: var(--bg-space);
  color: #ffffff;
}

.game-stats-inline {
  display: flex;
  gap: var(--space-sm);
  background: var(--bg-glass-card);
  border: 1px solid var(--glass-border);
  padding: 8px var(--space-sm);
  border-radius: 30px;
}

.stats-item {
  font-size: 12px;
  font-weight: bold;
  color: var(--text-secondary);
}

.stats-item strong {
  color: #ffffff;
  font-family: 'Plus Jakarta Sans', sans-serif;
  margin-left: 4px;
}

.accent-color {
  color: var(--accent-cyan) !important;
}

/* Game Play Arena Layout */
.game-play-area {
  display: grid;
  grid-template-columns: 1.2fr 1.8fr;
  gap: var(--space-md);
  align-items: start;
}

@media (max-width: 900px) {
  .game-play-area {
    grid-template-columns: 1fr;
  }
}

/* Centered 1-Column Layout (NEURO-DRILL Focused View) */
.game-play-area.vertical-layout {
  display: flex;
  flex-direction: column;
  align-items: center;
  grid-template-columns: 1fr;
  max-width: 500px;
  margin: 0 auto;
  width: 100%;
}

.glass {
  background: var(--bg-glass-card);
  border: 1px solid var(--glass-border);
  border-radius: 24px;
  backdrop-filter: blur(25px);
  padding: var(--space-sm);
  width: 100%;
}

/* Settings divider */
.settings-divider {
  color: rgba(255, 255, 255, 0.15);
  margin: 0 var(--space-xxs);
  font-size: 12px;
  user-select: none;
}

/* Dual N-Back Stat Panel (Centered) */
.nback-stats-panel {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  margin-bottom: var(--space-xs);
}

.nback-stats-row {
  display: flex;
  justify-content: space-between;
  width: 100%;
  gap: var(--space-xs);
}

.nback-brief-rules {
  display: flex;
  justify-content: center;
  gap: var(--space-sm);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: var(--space-xxs);
  font-size: 11px;
  color: var(--text-secondary);
}

.rule-hint {
  display: flex;
  align-items: center;
  gap: 4px;
}

.mini-stat {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  background: rgba(0, 0, 0, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.03);
  padding: 6px var(--space-xs);
  border-radius: 12px;
}

.mini-stat .label {
  font-size: 8px;
  font-weight: 800;
  color: var(--text-secondary);
  letter-spacing: 1.5px;
}

.mini-stat .value {
  font-size: 22px;
  font-weight: 800;
  color: #ffffff;
  font-family: 'Plus Jakarta Sans', sans-serif;
}

.highlight-n {
  color: var(--accent-cyan);
  font-size: 15px;
  font-weight: bold;
}

kbd {
  background: var(--bg-glass-element);
  border: 1px solid var(--glass-border);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 10px;
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-weight: bold;
  color: var(--accent-cyan);
  box-shadow: 0 2px 0 rgba(0,0,0,0.5);
  user-select: none;
}

/* N-Back Board Centering */
.nback-board-wrapper {
  width: 100%;
  max-width: 440px;
  margin: 0 auto;
}

/* DUAL N-BACK: 3x3 Grid */
.nback-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xs);
  width: 100%;
  aspect-ratio: 1 / 1;
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--glass-border);
  border-radius: 24px;
  padding: var(--space-xs);
}

.grid-cell {
  background: var(--bg-glass-element);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  transition: var(--transition-fast);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 36px;
  font-weight: 800;
  color: transparent; /* Hide text unless active */
  user-select: none;
}

/* Visual Flash Cell with large glowing character */
.grid-cell.active-flash {
  background: radial-gradient(circle, rgba(0, 240, 255, 0.15) 0%, rgba(0,0,0,0) 80%) !important;
  border-color: var(--accent-cyan) !important;
  box-shadow: 0 0 30px rgba(0, 240, 255, 0.3);
  color: #ffffff !important;
  text-shadow: 0 0 15px rgba(0, 240, 255, 0.8), 0 0 30px rgba(0, 240, 255, 0.4);
}

/* Indicator Lights (Symmetrical & Snappy response display) */
.feedback-lights-row {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  margin-top: var(--space-xs);
  margin-bottom: var(--space-xs);
  width: 100%;
}

.light-indicator {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 10px;
  font-weight: bold;
  color: var(--text-muted);
  transition: var(--transition-fast);
}

.light-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: var(--transition-fast);
}

/* Active indicator glows */
.light-indicator.active-pos {
  color: var(--accent-cyan);
}
.light-indicator.active-pos .light-dot {
  background: var(--accent-cyan);
  box-shadow: 0 0 12px var(--accent-cyan), 0 0 20px var(--accent-cyan);
  border-color: var(--accent-cyan);
}

.light-indicator.active-audio {
  color: var(--accent-purple);
}
.light-indicator.active-audio .light-dot {
  background: var(--accent-purple);
  box-shadow: 0 0 12px var(--accent-purple), 0 0 20px var(--accent-purple);
  border-color: var(--accent-purple);
}

/* Symmetrical Response Action Row */
.nback-action-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm);
  width: 100%;
  margin-top: var(--space-xxs);
}

.btn-action {
  background: var(--bg-glass-card);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  padding: 14px var(--space-xs);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  color: #ffffff;
  transition: var(--transition-fast);
  width: 100%;
}

.btn-act-key {
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--glass-border);
  width: 28px;
  height: 28px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 11px;
  color: var(--accent-cyan);
  box-shadow: 0 3px 0 rgba(0,0,0,0.4);
}

#btn-nback-audio .btn-act-key {
  color: var(--accent-purple);
}

.btn-act-title {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 1.5px;
}

.btn-nback-action:hover {
  border-color: rgba(255, 255, 255, 0.2);
  background: rgba(255, 255, 255, 0.05);
}

.btn-nback-action:active, .btn-nback-action.key-pressed {
  transform: translateY(2px);
  background: rgba(255, 255, 255, 0.08);
}

#btn-nback-pos.key-pressed {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 15px rgba(0, 240, 255, 0.2);
}

#btn-nback-audio.key-pressed {
  border-color: var(--accent-purple);
  box-shadow: 0 0 15px rgba(196, 142, 255, 0.2);
}

.game-control-bar {
  margin-top: var(--space-md);
  display: flex;
  justify-content: center;
  width: 100%;
}

.btn-play {
  width: 100%;
  max-width: 280px;
}

/* STROOP INTERFERENCE: Centered Panel */
.stroop-container {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  align-items: center;
}

.stroop-target-wrapper {
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--glass-border);
  width: 100%;
  height: 200px;
  border-radius: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: var(--space-xs) 0;
}

.stroop-word-display {
  font-family: 'Noto Serif JP', serif;
  font-size: 80px; /* ENLARGED FOR HIGH READABILITY */
  font-weight: 800;
  letter-spacing: 8px;
  text-shadow: 0 0 25px rgba(255,255,255,0.15);
  transition: var(--transition-fast);
  user-select: none;
}

.stroop-choices {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm);
  width: 100%;
}

.stroop-choice-btn {
  background: var(--bg-glass-card);
  border: 1px solid var(--glass-border);
  color: #ffffff;
  padding: var(--space-xs);
  font-family: 'Noto Serif JP', serif;
  font-size: 22px; /* ENLARGED CHOICE LABELS */
  font-weight: bold;
  border-radius: 16px;
  text-align: center;
  transition: var(--transition-fast);
}

.stroop-choice-btn:hover {
  border-color: rgba(255, 255, 255, 0.25);
  background: rgba(255, 255, 255, 0.05);
  box-shadow: 0 8px 24px rgba(0,0,0,0.3);
}

.stroop-choice-btn:active {
  transform: scale(0.97);
}

/* SCHULTE GRID: Grid layout */
.schulte-board-wrapper {
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--glass-border);
  padding: var(--space-xs);
  border-radius: 24px;
  width: 100%;
  aspect-ratio: 1 / 1;
  max-width: 440px;
  margin: var(--space-xs) auto;
}

.schulte-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--space-xxs);
  width: 100%;
  height: 100%;
}

.schulte-cell {
  background: var(--bg-glass-element);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 24px; /* ENLARGED FOR SPEED RUNS */
  font-weight: 800;
  color: #ffffff;
  transition: var(--transition-fast);
  user-select: none;
}

.schulte-cell:hover {
  background: rgba(0, 255, 196, 0.06);
  border-color: rgba(0, 255, 196, 0.35);
  box-shadow: 0 0 10px rgba(0, 255, 196, 0.1);
}

.schulte-cell.completed {
  background: rgba(0, 255, 196, 0.2) !important;
  border-color: var(--accent-emerald) !important;
  color: var(--accent-emerald) !important;
  text-shadow: 0 0 12px rgba(0, 255, 196, 0.6);
  box-shadow: 0 0 15px rgba(0, 255, 196, 0.15);
}

.schulte-cell.error {
  background: rgba(255, 110, 135, 0.2) !important;
  border-color: var(--accent-coral) !important;
  color: var(--accent-coral) !important;
  animation: shake 0.3s ease-in-out;
  text-shadow: 0 0 12px rgba(255, 110, 135, 0.6);
}

/* Shake animation for errors */
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-4px); }
  75% { transform: translateX(4px); }
}

/* --------------------------------------------------------------------------
   10. Footer Systems
   -------------------------------------------------------------------------- */
.app-footer {
  margin-top: var(--space-lg);
  border-top: 1px solid var(--glass-border);
  padding-top: var(--space-sm);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 10px;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.btn-text {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 10px;
  font-weight: bold;
  letter-spacing: 1px;
  transition: var(--transition-fast);
}

.btn-text:hover {
  color: var(--accent-coral);
}

/* --------------------------------------------------------------------------
   11. Overlays & Dialogs (Atmospheric Blur overlays)
   -------------------------------------------------------------------------- */
.overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 100;
  background: rgba(3, 6, 12, 0.8);
  backdrop-filter: blur(20px);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: var(--transition-premium);
}

.overlay.active {
  opacity: 1;
  pointer-events: auto;
}

/* Countdown */
.countdown-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xxs);
}

.countdown-label {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 4px;
  color: var(--accent-cyan);
  text-shadow: 0 0 10px rgba(0, 240, 255, 0.3);
}

.countdown-num {
  font-size: 120px;
  font-weight: 800;
  font-family: 'Plus Jakarta Sans', sans-serif;
  line-height: 1;
  background: linear-gradient(135deg, #ffffff 0%, #8fa0dd 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: pulse 1s infinite alternate;
}

@keyframes pulse {
  0% { transform: scale(0.95); opacity: 0.8; }
  100% { transform: scale(1.05); opacity: 1; }
}

/* Result Card */
.result-card {
  width: 90%;
  max-width: 480px;
  padding: var(--space-md);
  text-align: center;
  transform: scale(0.9);
  transition: var(--transition-premium);
}

.overlay.active .result-card {
  transform: scale(1);
}

.result-badge {
  font-size: 8px;
  font-weight: 800;
  color: var(--accent-cyan);
  border: 1px solid var(--accent-cyan);
  padding: 4px 12px;
  border-radius: 30px;
  display: inline-block;
  letter-spacing: 2px;
  margin-bottom: var(--space-xs);
  background: rgba(0, 240, 255, 0.05);
}

.result-card h3 {
  font-family: 'Noto Serif JP', serif;
  font-size: var(--font-size-h2);
  margin-bottom: var(--space-sm);
}

.result-stats-container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xs);
  margin-bottom: var(--space-sm);
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--glass-border);
  padding: var(--space-xs) var(--space-xxs);
  border-radius: 16px;
}

.result-stat-box {
  display: flex;
  flex-direction: column;
}

.result-stat-box .label {
  font-size: 7px;
  font-weight: 800;
  color: var(--text-muted);
  letter-spacing: 1px;
}

.result-stat-box .value {
  font-size: var(--font-size-h3);
  font-weight: 800;
  color: #ffffff;
  font-family: 'Plus Jakarta Sans', sans-serif;
  margin-top: 4px;
}

.result-comment {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-md);
  min-height: 48px;
}

.result-actions {
  display: flex;
  gap: var(--space-xs);
}