/* ==========================================================================
   ENTROPY PROFILER — MODERN DESIGN SYSTEM & STYLESHEET
   ========================================================================== */

:root {
  /* Core Color Tokens */
  --bg-app: #080C15;
  --bg-surface-1: #0F172A;
  --bg-surface-2: #162036;
  --bg-surface-3: #1E293B;
  --bg-surface-hover: #26354D;
  
  --border-subtle: rgba(255, 255, 255, 0.07);
  --border-medium: rgba(255, 255, 255, 0.14);
  --border-active: rgba(255, 255, 255, 0.28);

  --text-primary: #F8FAFC;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;
  --text-inverse: #090D16;

  /* Scientific Accents */
  --accent-cyan: #06B6D4;
  --accent-cyan-glow: rgba(6, 182, 212, 0.25);
  --accent-emerald: #10B981;
  --accent-emerald-glow: rgba(16, 185, 129, 0.25);
  --accent-amber: #F59E0B;
  --accent-amber-glow: rgba(245, 158, 11, 0.25);
  --accent-rose: #F43F5E;
  --accent-rose-glow: rgba(244, 63, 94, 0.3);
  --accent-blue: #3B82F6;

  /* Gradients */
  --gradient-integrity-good: linear-gradient(90deg, #10B981, #06B6D4);
  --gradient-integrity-warn: linear-gradient(90deg, #F59E0B, #E11D48);
  --gradient-integrity-crit: linear-gradient(90deg, #E11D48, #991B1B);

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', Consolas, Menlo, monospace;

  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.6);

  /* Radii */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;
}

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

html {
  font-family: var(--font-sans);
  background-color: var(--bg-app);
  color: var(--text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

/* App Container */
.app-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 1.25rem 1.5rem 3rem;
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* ==========================================================================
   HEADER
   ========================================================================== */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  background: var(--bg-surface-1);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(12px);
  gap: 1rem;
  flex-wrap: wrap;
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-logo {
  width: 40px;
  height: 40px;
  background: var(--bg-surface-2);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-cyan);
}

.brand-title {
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--text-primary);
}

.brand-tagline {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 500;
  display: block;
}

/* Mode Switcher */
.mode-switcher {
  display: flex;
  background: var(--bg-surface-2);
  padding: 0.25rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  gap: 0.25rem;
}

.mode-tab-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.9rem;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s ease;
}

.mode-tab-btn .mode-num {
  font-family: var(--font-mono);
  font-weight: 700;
  padding: 0.15rem 0.4rem;
  background: var(--bg-surface-3);
  border-radius: 4px;
  font-size: 0.75rem;
}

.mode-tab-btn .mode-cap {
  font-size: 0.7rem;
  color: var(--text-muted);
  font-weight: 400;
}

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

.mode-tab-btn.active {
  background: var(--bg-surface-3);
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-medium);
}

.mode-tab-btn.active .mode-num {
  background: var(--accent-cyan);
  color: var(--text-inverse);
}

/* Header Actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.sim-group {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  background: var(--bg-surface-2);
  padding: 0.2rem 0.35rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
}

.sim-bot-wrapper {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.85rem;
  padding: 0.55rem 1rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.15s ease;
  user-select: none;
}

.btn-sm {
  padding: 0.35rem 0.65rem;
  font-size: 0.78rem;
  border-radius: var(--radius-sm);
}

.btn-icon-only {
  padding: 0.35rem 0.5rem;
  font-size: 0.95rem;
  background: var(--bg-surface-2);
  border-color: var(--border-subtle);
  color: var(--text-secondary);
}

.btn-icon-only:hover {
  background: var(--bg-surface-hover);
  color: var(--text-primary);
}

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

.btn-ghost:hover {
  background: var(--bg-surface-3);
  color: var(--text-primary);
}

.btn-outline {
  background: var(--bg-surface-2);
  border-color: var(--border-medium);
  color: var(--text-primary);
}

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

.btn-primary {
  background: var(--accent-cyan);
  color: var(--text-inverse);
  font-weight: 700;
}

.btn-primary:hover {
  filter: brightness(1.1);
  box-shadow: 0 0 12px var(--accent-cyan-glow);
}

.btn-accent {
  background: var(--accent-emerald);
  color: var(--text-inverse);
  font-weight: 700;
}

.btn-accent:hover {
  filter: brightness(1.1);
  box-shadow: 0 0 12px var(--accent-emerald-glow);
}

.btn-secondary {
  background: var(--bg-surface-3);
  color: var(--text-primary);
  border-color: var(--border-medium);
}

.btn-secondary:hover {
  background: var(--bg-surface-hover);
}

.btn-sim-active {
  background: rgba(16, 185, 129, 0.2) !important;
  color: var(--accent-emerald) !important;
  border-color: var(--accent-emerald) !important;
  box-shadow: 0 0 10px var(--accent-emerald-glow);
  animation: sim-pulse 1.5s infinite;
}

@keyframes sim-pulse {
  0% { box-shadow: 0 0 4px var(--accent-emerald-glow); }
  50% { box-shadow: 0 0 14px var(--accent-emerald-glow); }
  100% { box-shadow: 0 0 4px var(--accent-emerald-glow); }
}

/* Form inputs */
.form-select, .form-select-sm {
  background: var(--bg-surface-1);
  color: var(--text-primary);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 0.8rem;
  padding: 0.3rem 0.5rem;
  outline: none;
  cursor: pointer;
}

.form-select:focus, .form-select-sm:focus {
  border-color: var(--accent-cyan);
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-full);
  font-size: 0.72rem;
  font-weight: 600;
  font-family: var(--font-mono);
  background: var(--bg-surface-3);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
}

.badge-success {
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-emerald);
  border-color: rgba(16, 185, 129, 0.3);
}

.badge-warning {
  background: rgba(245, 158, 11, 0.15);
  color: var(--accent-amber);
  border-color: rgba(245, 158, 11, 0.3);
}

.badge-danger {
  background: rgba(244, 63, 94, 0.15);
  color: var(--accent-rose);
  border-color: rgba(244, 63, 94, 0.3);
}

.badge-neutral {
  background: var(--bg-surface-3);
  color: var(--text-secondary);
}

/* ==========================================================================
   HERO METRICS GRID
   ========================================================================== */
.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 1.3fr 1fr;
  gap: 1rem;
}

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

.hero-card {
  background: var(--bg-surface-1);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1rem 1.25rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 0.75rem;
  box-shadow: var(--shadow-sm);
}

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

.card-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

/* Hero 1: Entropy Gauge */
.entropy-gauge-body {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.gauge-svg-wrapper {
  position: relative;
  width: 96px;
  height: 96px;
  flex-shrink: 0;
}

.radial-gauge {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.gauge-bg {
  fill: none;
  stroke: var(--bg-surface-3);
  stroke-width: 8;
}

.gauge-fill {
  fill: none;
  stroke: var(--accent-emerald);
  stroke-width: 8;
  stroke-linecap: round;
  transition: stroke-dashoffset 0.25s ease, stroke 0.25s ease;
}

.gauge-center-text {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.gauge-val {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1;
}

.gauge-unit {
  font-size: 0.62rem;
  color: var(--text-muted);
  margin-top: 0.2rem;
}

.entropy-sub-details {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  flex: 1;
}

.metric-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.78rem;
}

.sub-label {
  color: var(--text-muted);
}

.sub-val {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--text-secondary);
}

/* Hero 2: Integrity Bar */
.integrity-body {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.integrity-pct {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-primary);
}

.integrity-bar-track {
  position: relative;
  height: 12px;
  background: var(--bg-surface-3);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.integrity-bar-fill {
  height: 100%;
  border-radius: var(--radius-full);
  transition: width 0.2s ease, background 0.2s ease;
}

.integrity-meta {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-secondary);
  font-family: var(--font-mono);
}

.integrity-explanation {
  font-size: 0.75rem;
  color: var(--text-muted);
  background: var(--bg-surface-2);
  padding: 0.4rem 0.6rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
}

/* Hero 3: AI Predictor */
.ai-body {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.ai-guess-box {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-surface-2);
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
}

.ai-guess-label {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.ai-guess-symbol-wrapper {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.ai-guess-digit {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--accent-cyan);
  background: var(--bg-surface-3);
  padding: 0.1rem 0.5rem;
  border-radius: 4px;
  border: 1px solid var(--border-medium);
}

.ai-guess-prob {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.ai-benchmark-row {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

/* ==========================================================================
   SEQUENCE RIBBON / TAPE
   ========================================================================== */
.tape-wrapper {
  background: var(--bg-surface-1);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 0.75rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

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

.tape-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

.pulse-dot {
  width: 7px;
  height: 7px;
  background: var(--accent-emerald);
  border-radius: 50%;
  box-shadow: 0 0 6px var(--accent-emerald);
  animation: pulse-ring 1.8s infinite;
}

@keyframes pulse-ring {
  0% { transform: scale(0.9); opacity: 1; }
  50% { transform: scale(1.3); opacity: 0.5; }
  100% { transform: scale(0.9); opacity: 1; }
}

.tape-meta {
  display: flex;
  gap: 0.5rem;
}

.streak-hot {
  background: rgba(244, 63, 94, 0.2);
  color: var(--accent-rose);
  border-color: rgba(244, 63, 94, 0.4);
}

.tape-track-container {
  overflow-x: auto;
  padding: 0.35rem 0;
  scrollbar-width: thin;
  scrollbar-color: var(--bg-surface-3) transparent;
}

.tape-track {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  min-height: 44px;
}

.tape-placeholder {
  font-size: 0.82rem;
  color: var(--text-muted);
  font-style: italic;
}

.tape-cell {
  width: 34px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-surface-2);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  flex-shrink: 0;
  transition: transform 0.1s ease;
}

.cell-latest {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 8px var(--accent-cyan-glow);
  transform: scale(1.08);
}

.cell-repeat {
  border-bottom: 3px solid var(--accent-amber);
}

/* Distinct symbol styling */
.sym-0 { color: var(--accent-cyan); }
.sym-1 { color: var(--accent-emerald); }
.sym-2 { color: #38BDF8; }
.sym-3 { color: #A78BFA; }
.sym-4 { color: #F472B6; }
.sym-5 { color: #FB923C; }
.sym-6 { color: #FACC15; }
.sym-7 { color: #4ADE80; }
.sym-8 { color: #2DD4BF; }
.sym-9 { color: #818CF8; }

/* ==========================================================================
   KEYPAD ARENA
   ========================================================================== */
.section-keypad {
  display: flex;
  justify-content: center;
}

/* Binary Keypad */
.binary-keypad {
  display: flex;
  gap: 1.5rem;
  width: 100%;
  max-width: 520px;
}

.binary-btn {
  flex: 1;
  height: 84px;
  background: var(--bg-surface-2);
  border: 2px solid var(--border-medium);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.08s ease;
  user-select: none;
  box-shadow: var(--shadow-sm);
}

.binary-btn .key-symbol {
  font-family: var(--font-mono);
  font-size: 2.2rem;
  font-weight: 800;
  line-height: 1;
}

.binary-btn .key-hint {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-weight: 600;
  margin-top: 0.2rem;
}

.key-0 .key-symbol { color: var(--accent-cyan); }
.key-1 .key-symbol { color: var(--accent-emerald); }

.binary-btn:hover:not(:disabled) {
  background: var(--bg-surface-3);
  border-color: var(--text-secondary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.binary-btn:active:not(:disabled), .binary-btn.pressed {
  transform: translateY(2px) scale(0.98);
  border-color: var(--accent-cyan);
  background: var(--bg-surface-hover);
}

.key-btn:disabled, .key-btn.disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none !important;
}

/* Decimal Numpad */
.decimal-keypad {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.numpad-grid {
  display: grid;
  grid-template-columns: repeat(3, 72px);
  gap: 0.6rem;
}

.decimal-btn {
  height: 60px;
  background: var(--bg-surface-2);
  border: 1.5px solid var(--border-medium);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-primary);
  cursor: pointer;
  transition: all 0.08s ease;
  user-select: none;
  box-shadow: var(--shadow-sm);
}

.key-0-span {
  grid-column: 1 / span 3;
}

.decimal-btn:hover:not(:disabled) {
  background: var(--bg-surface-3);
  border-color: var(--text-secondary);
  transform: translateY(-1px);
}

.decimal-btn:active:not(:disabled), .decimal-btn.pressed {
  transform: translateY(2px) scale(0.97);
  border-color: var(--accent-cyan);
  background: var(--bg-surface-hover);
}

.keypad-hint {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ==========================================================================
   DIAGNOSTIC CHARTS GRID
   ========================================================================== */
.diagnostic-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

@media (max-width: 860px) {
  .diagnostic-grid {
    grid-template-columns: 1fr;
  }
}

.diag-card {
  background: var(--bg-surface-1);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  box-shadow: var(--shadow-sm);
}

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

.diag-card-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--text-primary);
}

.diag-icon {
  font-size: 0.95rem;
}

.diag-meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.diag-body {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  min-height: 140px;
}

.chart-caption {
  font-size: 0.7rem;
  color: var(--text-muted);
  font-style: italic;
}

.chart-empty {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 120px;
  font-size: 0.8rem;
  color: var(--text-muted);
  font-style: italic;
}

/* Frequency Bar Chart */
.bar-chart-grid {
  display: grid;
  gap: 0.75rem;
  height: 120px;
  align-items: flex-end;
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-10 { grid-template-columns: repeat(10, 1fr); gap: 0.25rem; }

.bar-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  height: 100%;
  justify-content: flex-end;
  gap: 0.25rem;
}

.bar-val-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.bar-track {
  position: relative;
  width: 100%;
  max-width: 48px;
  height: 80px;
  background: var(--bg-surface-3);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: flex-end;
  overflow: hidden;
}

.bar-baseline-line {
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--text-primary);
  opacity: 0.45;
  border-top: 1px dashed #fff;
  z-index: 2;
}

.bar-fill {
  width: 100%;
  border-radius: var(--radius-sm);
  transition: height 0.2s ease, background 0.2s ease;
}

.bar-normal { background: var(--accent-cyan); }
.bar-deviant-mid { background: var(--accent-amber); }
.bar-deviant-high { background: var(--accent-rose); }

.bar-sym-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-primary);
}

.sym-count {
  font-weight: 400;
  font-size: 0.65rem;
  color: var(--text-muted);
}

/* Transitions 2x2 Matrix & Gauge */
.binary-trans-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  align-items: center;
}

@media (max-width: 520px) {
  .binary-trans-layout {
    grid-template-columns: 1fr;
  }
}

.matrix-2x2 {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: 0.25rem;
  background: var(--bg-surface-2);
  padding: 0.5rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
}

.matrix-header-cell {
  font-size: 0.68rem;
  color: var(--text-muted);
  font-weight: 600;
  text-align: center;
}

.matrix-row-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
}

.matrix-cell {
  background: var(--bg-surface-3);
  padding: 0.4rem;
  border-radius: 4px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-primary);
}

.cell-hot {
  background: rgba(244, 63, 94, 0.25);
  color: var(--accent-rose);
  border: 1px solid rgba(244, 63, 94, 0.4);
}

.cell-cold {
  background: rgba(6, 182, 212, 0.15);
  color: var(--accent-cyan);
}

.alt-meter-card {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.alt-meter-title {
  font-size: 0.72rem;
  color: var(--text-secondary);
  font-weight: 600;
}

.alt-meter-track {
  position: relative;
  height: 10px;
  background: var(--bg-surface-3);
  border-radius: var(--radius-full);
}

.alt-meter-marker-expected {
  position: absolute;
  top: -2px;
  bottom: -2px;
  width: 2px;
  background: var(--accent-emerald);
  z-index: 2;
}

.alt-meter-needle {
  position: absolute;
  top: -3px;
  bottom: -3px;
  width: 10px;
  margin-left: -5px;
  background: var(--accent-cyan);
  border-radius: var(--radius-full);
  box-shadow: 0 0 6px var(--accent-cyan);
  transition: left 0.2s ease;
}

.alt-labels {
  display: flex;
  justify-content: space-between;
  font-size: 0.65rem;
  color: var(--text-muted);
}

.center-tag {
  color: var(--accent-emerald);
  font-weight: 600;
}

.alt-verdict {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
  text-align: center;
}

.tag-good {
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-emerald);
}

.tag-warn {
  background: rgba(245, 158, 11, 0.15);
  color: var(--accent-amber);
}

/* Decimal 10x10 Heatmap */
.heatmap-10x10 {
  display: grid;
  grid-template-columns: repeat(10, 1fr);
  gap: 2px;
  background: var(--bg-surface-2);
  padding: 0.4rem;
  border-radius: var(--radius-md);
}

.hm-cell {
  aspect-ratio: 1;
  background: rgba(6, 182, 212, var(--cell-alpha, 0));
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 2px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  font-weight: 700;
  color: var(--text-primary);
}

/* Runs Histogram */
.runs-chart-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 0.5rem;
  height: 120px;
  align-items: flex-end;
}

.run-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  height: 100%;
  justify-content: flex-end;
  gap: 0.25rem;
}

.run-val-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--text-primary);
}

.exp-sub {
  font-weight: 400;
  color: var(--text-muted);
}

.run-track {
  position: relative;
  width: 100%;
  max-width: 36px;
  height: 80px;
  background: var(--bg-surface-3);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: flex-end;
}

.run-exp-fill {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  border-top: 2px dashed rgba(255, 255, 255, 0.6);
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-sm);
}

.run-obs-fill {
  width: 100%;
  background: var(--accent-blue);
  border-radius: var(--radius-sm);
  z-index: 2;
  transition: height 0.2s ease;
}

.run-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-secondary);
}

.alert-inline {
  padding: 0.4rem 0.65rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
}

.alert-warn {
  background: rgba(245, 158, 11, 0.15);
  color: var(--accent-amber);
  border: 1px solid rgba(245, 158, 11, 0.3);
}

/* Patterns & Autocorrelation Layout */
.patterns-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

@media (max-width: 520px) {
  .patterns-layout {
    grid-template-columns: 1fr;
  }
}

.box-title {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

.autocorr-grid {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.autocorr-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.72rem;
}

.ac-label {
  width: 42px;
  color: var(--text-secondary);
  font-family: var(--font-mono);
}

.ac-bar-track {
  position: relative;
  flex: 1;
  height: 8px;
  background: var(--bg-surface-3);
  border-radius: var(--radius-full);
}

.ac-bar-center {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 1px;
  background: var(--border-medium);
}

.ac-bar-fill {
  position: absolute;
  top: 0;
  bottom: 0;
  border-radius: var(--radius-full);
  transition: width 0.2s ease;
}

.ac-pos { background: var(--accent-cyan); }
.ac-neg { background: var(--accent-rose); }
.ac-sig { box-shadow: 0 0 6px rgba(244, 63, 94, 0.6); }

.ac-val {
  width: 38px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-align: right;
  color: var(--text-secondary);
}

.ac-val-sig {
  color: var(--accent-rose);
  font-weight: 700;
}

.pattern-pill-list {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.pattern-pill {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-surface-2);
  padding: 0.3rem 0.6rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  font-size: 0.75rem;
}

.pattern-str {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--accent-amber);
}

.pattern-count {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
}

.cycle-detected-badge {
  background: rgba(244, 63, 94, 0.2);
  color: var(--accent-rose);
  border: 1px solid rgba(244, 63, 94, 0.4);
  padding: 0.4rem 0.6rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  margin-bottom: 0.4rem;
}

.no-patterns-msg {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-style: italic;
}

/* ==========================================================================
   INFO ACCORDION
   ========================================================================== */
.section-info {
  background: var(--bg-surface-1);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.info-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 1.25rem;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.88rem;
  color: var(--text-secondary);
  user-select: none;
}

.info-summary:hover {
  color: var(--text-primary);
  background: var(--bg-surface-2);
}

.info-content {
  padding: 1rem 1.25rem 1.5rem;
  border-top: 1px solid var(--border-subtle);
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
}

.info-card {
  background: var(--bg-surface-2);
  padding: 1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
}

.info-card h4 {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-cyan);
  margin-bottom: 0.4rem;
}

.info-card p {
  font-size: 0.78rem;
  color: var(--text-secondary);
  line-height: 1.45;
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.app-footer {
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-muted);
  padding-top: 1rem;
}

/* ==========================================================================
   MODALS
   ========================================================================== */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(4, 7, 13, 0.82);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 999;
  padding: 1rem;
}

.modal-dialog {
  background: var(--bg-surface-1);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  max-width: 580px;
  width: 100%;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  animation: modal-enter 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modal-enter {
  from { opacity: 0; transform: scale(0.95) translateY(10px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border-subtle);
}

.modal-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.modal-close-btn {
  background: transparent;
  border: none;
  font-size: 1.5rem;
  color: var(--text-muted);
  cursor: pointer;
  line-height: 1;
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
}

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

.modal-body {
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  max-height: 80vh;
  overflow-y: auto;
}

.modal-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  background: var(--bg-surface-2);
  border-top: 1px solid var(--border-subtle);
}

/* Halt Specific Styles */
.modal-header-halt {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem;
  background: linear-gradient(180deg, rgba(244, 63, 94, 0.18), transparent);
  border-bottom: 1px solid rgba(244, 63, 94, 0.25);
}

.verdict-banner {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.verdict-icon {
  font-size: 1.8rem;
}

.verdict-title {
  font-size: 1rem;
  font-weight: 800;
  color: var(--accent-rose);
  letter-spacing: 0.03em;
}

.verdict-sub {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.autopsy-flaw-card {
  background: var(--bg-surface-2);
  border: 1px solid rgba(244, 63, 94, 0.35);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  position: relative;
}

.flaw-badge {
  display: inline-block;
  font-size: 0.68rem;
  font-weight: 800;
  color: var(--accent-rose);
  background: rgba(244, 63, 94, 0.2);
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  letter-spacing: 0.06em;
  align-self: flex-start;
}

.flaw-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-primary);
}

.flaw-subtitle {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-amber);
}

.flaw-explanation {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.flaw-metrics-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
  margin-top: 0.5rem;
}

.flaw-metric-box {
  background: var(--bg-surface-3);
  padding: 0.5rem;
  border-radius: var(--radius-sm);
  text-align: center;
}

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

.f-val {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-top: 0.15rem;
}

.f-val-obs { color: var(--accent-rose); }
.f-val-p { color: var(--accent-amber); }

.autopsy-section {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.section-title {
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

/* Waterfall Table */
.waterfall-table {
  background: var(--bg-surface-2);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.6rem 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.wf-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.78rem;
}

.wf-label { color: var(--text-secondary); }
.wf-val { font-family: var(--font-mono); font-weight: 600; }
.wf-val-max { color: var(--text-primary); }
.wf-val-loss { color: var(--accent-rose); }
.wf-row-total {
  border-top: 1px solid var(--border-medium);
  padding-top: 0.4rem;
  font-weight: 700;
}
.wf-val-final { color: var(--accent-emerald); font-weight: 800; }

.sprt-summary-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
}

.sprt-box {
  background: var(--bg-surface-2);
  padding: 0.6rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  text-align: center;
}

.s-lbl { font-size: 0.65rem; color: var(--text-muted); }
.s-val {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--accent-cyan);
  margin-top: 0.15rem;
}

/* Settings Form */
.setting-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.setting-label {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-primary);
}

.setting-desc {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.82rem;
  color: var(--text-secondary);
  cursor: pointer;
}

/* ==========================================================================
   MATHEMATICAL & STATISTICAL DETAILS SECTION
   ========================================================================== */
.section-math-details {
  background: var(--bg-surface-1);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.math-details-wrapper {
  display: flex;
  flex-direction: column;
}

.math-details-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  background: var(--bg-surface-1);
  border-bottom: 1px solid var(--border-subtle);
  gap: 1rem;
  flex-wrap: wrap;
}

.math-header-title-block {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.math-icon {
  font-size: 1.5rem;
}

.math-header-title {
  font-size: 0.95rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  color: var(--text-primary);
}

.math-header-subtitle {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.math-details-content {
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  background: var(--bg-app);
}

.math-tabs {
  display: flex;
  gap: 0.4rem;
  overflow-x: auto;
  padding-bottom: 0.25rem;
  border-bottom: 1px solid var(--border-subtle);
}

.math-tab-btn {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 0.85rem;
  background: var(--bg-surface-2);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.15s ease;
}

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

.math-tab-btn.active {
  background: var(--bg-surface-3);
  color: var(--accent-cyan);
  border-color: var(--accent-cyan);
  box-shadow: 0 0 8px var(--accent-cyan-glow);
}

.math-tab-pane {
  display: none;
}

.math-tab-pane.active {
  display: block;
}

.math-card-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

@media (max-width: 860px) {
  .math-card-grid {
    grid-template-columns: 1fr;
  }
}

.math-card {
  background: var(--bg-surface-1);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.1rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.math-card.span-2 {
  grid-column: 1 / -1;
}

.math-card-title {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.math-text {
  font-size: 0.78rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.formula-box {
  background: var(--bg-surface-2);
  border: 1px solid var(--border-subtle);
  border-left: 3px solid var(--accent-cyan);
  border-radius: var(--radius-sm);
  padding: 0.65rem 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.formula-label {
  font-size: 0.68rem;
  color: var(--text-muted);
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.formula-eq {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: #E2E8F0;
  overflow-x: auto;
  line-height: 1.6;
}

.live-eval-box {
  background: var(--bg-surface-2);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.live-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0.4rem 0.8rem;
}

.live-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.75rem;
}

.live-item .lbl {
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.live-item .val {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--text-primary);
}

.val-accent { color: var(--accent-cyan); font-weight: 800; }
.val-p { color: var(--accent-amber); font-weight: 700; }
.val-loss { color: var(--accent-rose); font-weight: 700; }

.sym-tag {
  background: var(--bg-surface-3);
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
  border: 1px solid var(--border-medium);
}

.live-verdict {
  font-size: 0.75rem;
  color: var(--text-secondary);
  background: var(--bg-surface-3);
  padding: 0.35rem 0.6rem;
  border-radius: var(--radius-sm);
  line-height: 1.4;
}

.live-terms {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  background: var(--bg-surface-3);
  padding: 0.3rem 0.5rem;
  border-radius: var(--radius-sm);
}