/* ==========================================================================
   O₂ SleepWell Laboratory - Trail Making Test (TMT-A/B) Stylesheet
   ========================================================================== */

/* --- 1. CORE VARIABLES & DESIGN SYSTEM --- */
:root {
  /* Font Families */
  --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'SFMono-Regular', Consolas, "Liberation Mono", Menlo, monospace;

  /* Color Palette (Dark Theme Default) */
  --bg-primary: #070b13;
  --bg-secondary: #0c1220;
  --bg-tertiary: #111a2e;
  
  --card-bg: rgba(12, 18, 32, 0.65);
  --card-border: rgba(255, 255, 255, 0.08);
  --card-glow: rgba(0, 225, 217, 0.03);

  --text-primary: #f3f4f6;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;

  /* Accent Colors */
  --brand-primary: #00e1d9;
  --brand-primary-rgb: 0, 225, 217;
  --brand-secondary: #3b82f6;
  --brand-secondary-rgb: 59, 130, 246;

  /* Clinical Status Colors */
  --success: #10b981;
  --success-rgb: 16, 185, 129;
  --warning: #f59e0b;
  --warning-rgb: 245, 158, 11;
  --danger: #ff3366;
  --danger-rgb: 255, 51, 102;
  --abnormal: #0f172a;

  /* Animations & Shadow Constants */
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: all 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
  --glow-shadow: 0 0 20px rgba(0, 225, 217, 0.15);
  --glow-success: 0 0 20px rgba(16, 185, 129, 0.2);
}

/* --- 2. LIGHT THEME OVERRIDES --- */
[data-theme="light"] {
  --bg-primary: #f0f4f8;
  --bg-secondary: #ffffff;
  --bg-tertiary: #e2e8f0;
  
  --card-bg: rgba(255, 255, 255, 0.75);
  --card-border: rgba(0, 0, 0, 0.08);
  --card-glow: rgba(0, 225, 217, 0.02);

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;

  --glass-shadow: 0 8px 32px 0 rgba(15, 23, 42, 0.06);
  --glow-shadow: 0 0 20px rgba(0, 225, 217, 0.06);
  --glow-success: 0 0 20px rgba(16, 185, 129, 0.1);
  --abnormal: #f1f5f9;
}

/* --- 3. BASE RESET & ATMOSPHERE --- */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  scrollbar-width: thin;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
  transition: background-color 0.4s ease, color 0.4s ease;
}

/* Decorative Atmospheric Glowing Blurs */
body::before, body::after {
  content: "";
  position: fixed;
  width: 45vw;
  height: 45vw;
  border-radius: 50%;
  pointer-events: none;
  z-index: -1;
  opacity: 0.12;
  filter: blur(130px);
  transition: var(--transition-smooth);
}

body::before {
  top: -10vw;
  right: -10vw;
  background: radial-gradient(circle, rgba(var(--brand-primary-rgb), 0.4) 0%, rgba(0,0,0,0) 70%);
}

body::after {
  bottom: -15vw;
  left: -15vw;
  background: radial-gradient(circle, rgba(var(--brand-secondary-rgb), 0.35) 0%, rgba(0,0,0,0) 70%);
}

/* --- 4. APP LAYOUT STRUCTURE --- */
.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  width: 100%;
}

.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* --- 5. HEADER COMPONENT --- */
.app-header {
  border-bottom: 1px solid var(--card-border);
  background: rgba(var(--bg-secondary), 0.3);
  backdrop-filter: blur(15px);
  -webkit-backdrop-filter: blur(15px);
  position: sticky;
  top: 0;
  z-index: 100;
  transition: var(--transition-smooth);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.logo-wrapper {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
}

.company-logo {
  height: 34px;
  border-radius: 6px;
  border: 1px solid var(--card-border);
  object-fit: cover;
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.1;
}

.brand-tag {
  font-size: 0.6rem;
  color: var(--brand-primary);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-top: 2px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.lang-toggle-btn {
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-secondary);
  background: var(--bg-tertiary);
  padding: 0.45rem 0.9rem;
  border-radius: 8px;
  border: 1px solid var(--card-border);
  cursor: pointer;
  transition: var(--transition-smooth);
}

.lang-toggle-btn:hover {
  color: var(--brand-primary);
  border-color: var(--brand-primary);
}

.theme-toggle-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--bg-tertiary);
  border: 1px solid var(--card-border);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.theme-toggle-btn:hover {
  border-color: var(--text-muted);
  transform: scale(1.05);
}

.theme-toggle-btn svg {
  width: 16px;
  height: 16px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
}

.hidden {
  display: none !important;
}

/* --- 6. GLASS PANEL BASE --- */
.glass-card {
  background: var(--card-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--card-border);
  border-radius: 20px;
  box-shadow: var(--glass-shadow);
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

/* --- 7. INTRO SCREEN --- */
.intro-section {
  padding: 2.5rem 0;
  flex: 1;
  display: flex;
  align-items: center;
}

.intro-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 2rem;
  align-items: stretch;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.75rem;
  border-radius: 99px;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: rgba(var(--brand-primary-rgb), 0.08);
  color: var(--brand-primary);
  border: 1px solid rgba(var(--brand-primary-rgb), 0.2);
  margin-bottom: 1.25rem;
}

.badge svg {
  color: var(--brand-primary);
}

.hero-title {
  font-family: var(--font-heading);
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 1rem;
}

.hero-title span {
  background: linear-gradient(135deg, var(--brand-primary) 0%, var(--brand-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  color: var(--brand-primary);
}

.hero-description {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: 2rem;
}

.info-cards-stack {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.info-bullet-card {
  padding: 1.25rem;
  background: rgba(var(--bg-tertiary), 0.3);
  border-radius: 16px;
  border: 1px solid var(--card-border);
}

.info-bullet-card h3 {
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.info-bullet-card h3::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--brand-primary);
}

.info-bullet-card p {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.info-bullet-card .translation-sub {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-style: italic;
  margin-top: 0.25rem;
}

/* Control Config Column */
.control-config-card {
  padding: 2.25rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.section-card-title {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 0.35rem;
}

.card-subtitle {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

.config-form-group {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}

.config-item {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.config-label {
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

.input-number-spinner {
  background: var(--bg-tertiary);
  border: 1px solid var(--card-border);
  padding: 0.9rem;
  border-radius: 12px;
  color: var(--text-primary);
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  text-align: center;
  outline: none;
  box-shadow: inset 0 2px 4px rgba(0,0,0,0.2);
  transition: var(--transition-smooth);
}

.input-number-spinner:focus {
  border-color: var(--brand-primary);
  box-shadow: inset 0 2px 4px rgba(0,0,0,0.2), 0 0 10px rgba(var(--brand-primary-rgb), 0.15);
}

.segmented-selector {
  display: grid;
  grid-template-columns: 1fr 1fr;
  background: var(--bg-tertiary);
  border: 1px solid var(--card-border);
  padding: 0.25rem;
  border-radius: 12px;
}

.selector-btn {
  background: transparent;
  border: none;
  padding: 0.75rem;
  border-radius: 10px;
  color: var(--text-secondary);
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition-smooth);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  line-height: 1.2;
}

.selector-btn.active {
  background: var(--brand-primary);
  color: #070b13;
  box-shadow: 0 4px 12px rgba(var(--brand-primary-rgb), 0.25);
}

.selector-btn .sub-text {
  font-size: 0.65rem;
  font-weight: 500;
  opacity: 0.8;
  margin-top: 1px;
}

/* Core Buttons */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: var(--brand-primary);
  color: #070b13;
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 800;
  padding: 1rem 1.75rem;
  border-radius: 12px;
  border: 1px solid transparent;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  cursor: pointer;
  transition: var(--transition-smooth);
  box-shadow: 0 4px 15px rgba(var(--brand-primary-rgb), 0.25);
  width: 100%;
}

.btn-primary:hover {
  background: #ffffff;
  color: #070b13;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(var(--brand-primary-rgb), 0.4);
}

.btn-primary:active {
  transform: translateY(0);
  opacity: 0.85;
}

/* Citations Footer info */
.citation-footer {
  margin-top: 2rem;
  border-top: 1px solid var(--card-border);
  padding-top: 1rem;
  font-size: 0.65rem;
  color: var(--text-muted);
  line-height: 1.4;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

/* --- 8. INSTRUCTIONS SCREEN --- */
.instr-section {
  padding: 2.5rem 0;
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.instr-card {
  max-width: 500px;
  width: 100%;
  padding: 2rem;
  display: flex;
  flex-direction: column;
  max-height: 90vh;
}

.instr-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.instr-header-row h2 {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-primary);
}

.instr-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 1.5rem;
}

.demo-svg-container {
  background: rgba(var(--bg-tertiary), 0.3);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  height: 150px;
  width: 100%;
  margin-bottom: 1.5rem;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.demo-svg-container svg {
  width: 100%;
  height: 100%;
}

.instr-warning-box {
  background: rgba(245, 158, 11, 0.08);
  border: 1px solid rgba(245, 158, 11, 0.25);
  border-radius: 12px;
  padding: 0.75rem 1rem;
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
  margin-bottom: 1.5rem;
}

.instr-warning-box svg {
  color: var(--warning);
  flex-shrink: 0;
  margin-top: 2px;
}

.instr-warning-box p {
  font-size: 0.75rem;
  color: var(--warning);
  line-height: 1.4;
  font-weight: 500;
}

.instr-citations-scroll {
  flex: 1;
  overflow-y: auto;
  max-height: 90px;
  border-top: 1px solid var(--card-border);
  padding-top: 0.75rem;
  margin-bottom: 1.5rem;
  scrollbar-width: thin;
}

.instr-citations-scroll p {
  font-size: 0.65rem;
  color: var(--text-muted);
  line-height: 1.4;
  font-style: italic;
}

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--card-border);
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 700;
  padding: 0.85rem 1.5rem;
  border-radius: 12px;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.btn-secondary:hover {
  background: var(--bg-tertiary);
  border-color: var(--text-muted);
}

/* --- 9. ACTIVE TEST ARENA --- */
.arena-section {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: var(--bg-primary);
  display: flex;
  flex-direction: column;
}

.arena-header {
  height: 64px;
  border-bottom: 1px solid var(--card-border);
  background: rgba(var(--bg-secondary), 0.6);
  backdrop-filter: blur(15px);
  -webkit-backdrop-filter: blur(15px);
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  z-index: 50;
}

.arena-meta {
  display: flex;
  flex-direction: column;
}

.arena-part-label {
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--brand-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  line-height: 1.1;
}

.arena-part-guide {
  font-size: 0.65rem;
  color: var(--text-muted);
  font-weight: 600;
  margin-top: 1px;
}

.arena-stopwatch {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
}

.arena-action-btns {
  display: flex;
  gap: 0.75rem;
}

.arena-btn {
  font-family: var(--font-heading);
  font-size: 0.7rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.arena-btn-reset {
  background: transparent;
  border: 1px solid var(--card-border);
  color: var(--text-secondary);
}

.arena-btn-reset:hover {
  border-color: var(--text-muted);
  color: var(--text-primary);
}

.arena-btn-quit {
  background: rgba(255, 51, 102, 0.08);
  border: 1px solid rgba(255, 51, 102, 0.2);
  color: var(--danger);
}

.arena-btn-quit:hover {
  background: var(--danger);
  color: #ffffff;
}

/* Dynamic testing field */
.game-container {
  flex: 1;
  position: relative;
  background-color: var(--bg-secondary);
  overflow: hidden;
  user-select: none;
  -webkit-user-select: none;
  touch-action: none;
}

/* Nodes Drawing Layer */
#svg-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 10;
}

#svg-canvas line {
  stroke-linecap: round;
  filter: drop-shadow(0 0 5px rgba(0, 225, 217, 0.25));
}

#nodes-layer {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 20;
}

/* Node Elements */
.node {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 0.95rem;
  position: absolute;
  cursor: pointer;
  background: var(--bg-tertiary);
  border: 2.5px solid var(--card-border);
  color: var(--text-secondary);
  transition: var(--transition-bounce);
  box-shadow: 0 4px 10px rgba(0,0,0,0.3);
}

.node:hover {
  transform: scale(1.1);
  border-color: var(--brand-secondary);
  color: var(--text-primary);
}

.node-correct {
  background-color: var(--success) !important;
  border-color: var(--success) !important;
  color: #ffffff !important;
  pointer-events: none;
  transform: scale(1.05);
  box-shadow: var(--glow-success);
}

.node-error {
  background-color: #000000 !important;
  border-color: #000000 !important;
  color: #ffffff !important;
  animation: shake 0.4s cubic-bezier(.36,.07,.19,.97) both;
  transform: translate3d(0, 0, 0);
  backface-visibility: hidden;
  perspective: 1000px;
}

@keyframes shake {
  10%, 90% { transform: translate3d(-2px, 0, 0); }
  20%, 80% { transform: translate3d(3px, 0, 0); }
  30%, 50%, 70% { transform: translate3d(-4px, 0, 0); }
  40%, 60% { transform: translate3d(4px, 0, 0); }
}

/* Pre-test Countdown Overlay */
#countdown-overlay {
  display: none;
  position: absolute;
  inset: 0;
  background: rgba(var(--bg-primary-rgb), 0.7);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 150;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  pointer-events: auto;
}

#countdown-text {
  font-family: var(--font-heading);
  font-size: 6rem;
  font-weight: 900;
  color: var(--brand-primary);
  animation: pulseIn 1s infinite cubic-bezier(0.25, 0.46, 0.45, 0.94);
  text-shadow: 0 0 30px rgba(var(--brand-primary-rgb), 0.4);
}

@keyframes pulseIn {
  0% { transform: scale(0.4); opacity: 0; }
  50% { transform: scale(1.05); opacity: 1; }
  100% { transform: scale(1); opacity: 0; }
}

/* --- 10. DIAGNOSTIC RESULTS REPORT --- */
.results-section {
  padding: 3rem 0;
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(7, 11, 19, 0.05);
}

.results-modal-wrapper {
  max-width: 520px;
  width: 100%;
}

.capture-area {
  background: var(--bg-secondary);
  border: 1px solid var(--card-border);
  border-radius: 24px;
  padding: 2.25rem;
  box-shadow: var(--glass-shadow);
  position: relative;
  overflow: hidden;
}

.results-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 2rem;
}

.results-title-block h2 {
  font-family: var(--font-heading);
  font-size: 1.45rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  text-transform: uppercase;
  color: var(--text-primary);
}

.results-timestamp {
  font-size: 0.65rem;
  color: var(--text-muted);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: 0.25rem;
}

.results-status-icon {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 1.35rem;
  box-shadow: 0 4px 10px rgba(0,0,0,0.15);
}

.results-status-icon.status-normal {
  background: rgba(16, 185, 129, 0.1);
  border: 1.5px solid var(--success);
  color: var(--success);
  box-shadow: 0 0 15px rgba(16, 185, 129, 0.1);
}

.results-status-icon.status-abnormal {
  background: rgba(255, 51, 102, 0.1);
  border: 1.5px solid var(--danger);
  color: var(--danger);
  box-shadow: 0 0 15px rgba(255, 51, 102, 0.1);
}

/* Statistics Grid */
.stats-summary-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.stats-card {
  padding: 1.25rem;
  border-radius: 16px;
  border: 1px solid var(--card-border);
  text-align: center;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.stats-card.status-normal {
  background: rgba(16, 185, 129, 0.03);
  border-color: rgba(16, 185, 129, 0.15);
}

.stats-card.status-abnormal {
  background: rgba(255, 51, 102, 0.03);
  border-color: rgba(255, 51, 102, 0.15);
}

.stats-card.col-span-2 {
  grid-column: span 2;
  text-align: left;
  padding: 1.25rem 1.5rem;
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
}

.stat-header {
  font-family: var(--font-heading);
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

.stat-value {
  font-family: var(--font-heading);
  font-size: 1.65rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-top: 0.25rem;
  line-height: 1.1;
}

.ratio-value {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1;
}

.ratio-badge {
  padding: 0.35rem 0.75rem;
  border-radius: 20px;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.ratio-badge.normal {
  background: rgba(16, 185, 129, 0.15);
  color: var(--success);
}

.ratio-badge.abnormal {
  background: rgba(255, 51, 102, 0.15);
  color: var(--danger);
}

/* Peer Comparison Panel */
.norm-comparison-panel {
  background: rgba(var(--bg-tertiary), 0.4);
  border: 1px solid var(--card-border);
  border-radius: 18px;
  padding: 1.25rem;
  margin-bottom: 1.5rem;
}

.norm-panel-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.percentile-score {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 800;
  line-height: 1;
}

.percentile-score.normal { color: var(--success); }
.percentile-score.abnormal { color: var(--danger); }

.percentile-track-bar {
  height: 6px;
  width: 100%;
  background: var(--bg-tertiary);
  border-radius: 99px;
  overflow: hidden;
  margin-bottom: 0.75rem;
}

.percentile-fill-bar {
  height: 100%;
  border-radius: 99px;
  transition: width 1.2s cubic-bezier(0.1, 0.8, 0.2, 1);
}

.percentile-fill-bar.normal { background: var(--success); }
.percentile-fill-bar.abnormal { background: var(--danger); }

.norm-description {
  font-size: 0.75rem;
  color: var(--text-secondary);
  line-height: 1.45;
}

.norm-clinical-note {
  border-top: 1px dashed var(--card-border);
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  font-size: 0.7rem;
  color: var(--text-muted);
  line-height: 1.4;
}

.norm-clinical-note strong {
  color: var(--text-secondary);
}

/* Inter-click latency SVG timeline chart */
.timeline-card {
  border: 1px solid var(--card-border);
  border-radius: 18px;
  padding: 1rem 1.25rem;
  margin-bottom: 2rem;
  background: rgba(var(--bg-tertiary), 0.2);
}

.timeline-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.timeline-card-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.timeline-card-title svg {
  color: var(--brand-primary);
}

.timeline-legend {
  font-size: 0.65rem;
  color: var(--text-muted);
}

.timeline-chart-wrapper {
  width: 100%;
  height: 100px;
  overflow: hidden;
}

.timeline-chart-wrapper svg {
  width: 100%;
  height: 100%;
}

.timeline-chart-wrapper line {
  stroke-dasharray: 2;
}

/* Post-Test Control Panel */
.post-action-panel {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.btn-report-export {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--card-border);
}

.btn-report-export:hover {
  border-color: var(--brand-secondary);
  background: rgba(var(--brand-secondary-rgb), 0.05);
}

.btn-text-restart {
  background: transparent;
  border: none;
  font-family: var(--font-heading);
  font-size: 0.7rem;
  font-weight: 800;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.5rem 0;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.btn-text-restart:hover {
  color: var(--text-primary);
}

/* Historical Log Records Table */
.history-section-card {
  border: 1px solid var(--card-border);
  border-radius: 18px;
  padding: 1.25rem;
  margin-top: 1.5rem;
  background: rgba(var(--bg-tertiary), 0.2);
}

.history-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.history-card-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.history-clear-btn {
  background: transparent;
  border: none;
  font-family: var(--font-heading);
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--danger);
  text-transform: uppercase;
  cursor: pointer;
  opacity: 0.7;
  transition: var(--transition-smooth);
}

.history-clear-btn:hover {
  opacity: 1;
}

.history-table-wrapper {
  width: 100%;
  overflow-x: auto;
}

.history-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.75rem;
}

.history-table th {
  color: var(--text-muted);
  font-weight: 700;
  text-transform: uppercase;
  font-size: 0.65rem;
  padding: 0.5rem;
  border-bottom: 1px solid var(--card-border);
}

.history-table td {
  padding: 0.65rem 0.5rem;
  border-bottom: 1px solid rgba(255,255,255,0.03);
  color: var(--text-secondary);
  white-space: nowrap;
}

.history-table tr:last-child td {
  border: none;
}

.history-badge-status {
  font-weight: 700;
  font-size: 0.65rem;
}
.history-badge-status.normal { color: var(--success); }
.history-badge-status.abnormal { color: var(--danger); }

/* --- 11. EXPORT PREVIEW OVERLAY --- */
#save-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 500;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: rgba(7, 11, 19, 0.95);
  padding: 1.5rem;
  backdrop-filter: blur(10px);
}

#preview-img {
  max-width: 90%;
  max-height: 70vh;
  border-radius: 16px;
  box-shadow: 0 10px 40px rgba(0,0,0,0.8);
  border: 1px solid var(--card-border);
  margin-bottom: 1.5rem;
}

.overlay-instructions {
  color: var(--text-primary);
  font-weight: 700;
  text-align: center;
  font-size: 0.9rem;
  line-height: 1.4;
  margin-bottom: 2rem;
}

.overlay-instructions span {
  font-weight: 400;
  font-size: 0.75rem;
  color: var(--text-secondary);
  display: block;
  margin-top: 4px;
}

.overlay-close-btn {
  background: #ffffff;
  color: #070b13;
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 800;
  padding: 0.75rem 2rem;
  border-radius: 30px;
  border: none;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: var(--transition-smooth);
}

.overlay-close-btn:hover {
  background: var(--brand-primary);
}

/* --- 12. RESPONSIVE MEDIA QUERIES --- */
@media (max-width: 850px) {
  .intro-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
}

@media (max-width: 480px) {
  html {
    font-size: 15px;
  }
  
  .intro-section {
    padding: 1.5rem 0;
  }
  
  .hero-title {
    font-size: 1.85rem;
  }
  
  .control-config-card, .capture-area {
    padding: 1.5rem;
  }
  
  .node {
    width: 38px;
    height: 38px;
    font-size: 0.85rem;
    border-width: 2px;
  }
}

/* Animation delay helpers for demo SVGs */
.demo-line {
  stroke: var(--brand-primary);
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-dasharray: 200;
  stroke-dashoffset: 200;
  animation: drawLine 2s ease-in-out infinite;
}

@keyframes drawLine {
  0% { stroke-dashoffset: 200; opacity: 0; }
  25% { opacity: 1; }
  65% { stroke-dashoffset: 0; opacity: 1; }
  100% { stroke-dashoffset: 0; opacity: 0; }
}