/* ========================================
   CRONOS - Premium Design System
   Advanced Static Code Analysis Platform
======================================== */

/* === Core Reset & Foundations === */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* Premium Color Palette */
  --color-bg-deep: #06080f;
  --color-bg-primary: #0a0e1a;
  --color-bg-secondary: #0f1629;
  --color-bg-tertiary: #151d35;
  --color-bg-elevated: #1a2540;
  --color-bg-surface: #1f2d4a;
  
  --color-text-primary: #ffffff;
  --color-text-secondary: #e2e8f0;
  --color-text-tertiary: #cbd5e1;
  --color-text-muted: #94a3b8;
  --color-text-subtle: #64748b;
  
  /* Accent Colors */
  --color-accent-cyan: #00d4ff;
  --color-accent-purple: #7b2ff7;
  --color-accent-violet: #a855f7;
  --color-accent-blue: #3b82f6;
  --color-accent-teal: #06b6d4;
  
  /* Status Colors */
  --color-success: #10b981;
  --color-success-light: #34d399;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  --color-info: #06b6d4;
  
  /* Border & Overlay */
  --border-primary: rgba(255, 255, 255, 0.06);
  --border-secondary: rgba(255, 255, 255, 0.1);
  --border-active: rgba(0, 212, 255, 0.3);
  --overlay-dark: rgba(6, 8, 15, 0.8);
  --overlay-glass: rgba(255, 255, 255, 0.03);
  
  /* Premium Gradients */
  --gradient-primary: linear-gradient(135deg, #00d4ff 0%, #7b2ff7 100%);
  --gradient-accent: linear-gradient(135deg, #00d4ff 0%, #a855f7 50%, #7b2ff7 100%);
  --gradient-surface: linear-gradient(135deg, rgba(0, 212, 255, 0.04) 0%, rgba(123, 47, 247, 0.04) 100%);
  --gradient-mesh: radial-gradient(ellipse at top, rgba(0, 212, 255, 0.15), transparent 50%),
                   radial-gradient(ellipse at bottom, rgba(123, 47, 247, 0.15), transparent 50%);
  
  /* Advanced Shadows */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-sm: 0 2px 6px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.6);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.7);
  --shadow-glow-cyan: 0 0 40px rgba(0, 212, 255, 0.4);
  --shadow-glow-purple: 0 0 40px rgba(123, 47, 247, 0.4);
  --shadow-inner: inset 0 2px 8px rgba(0, 0, 0, 0.3);
  
  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
  
  /* Spacing Scale */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  
  /* Fluid Animations */
  --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
  --ease-elastic: cubic-bezier(0.175, 0.885, 0.32, 1.275);
  --duration-fast: 150ms;
  --duration-base: 250ms;
  --duration-slow: 400ms;
  --duration-slower: 600ms;
}

/* === Base Styles === */
html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-primary);
  background: var(--color-bg-deep);
  color: var(--color-text-primary);
  line-height: 1.6;
  font-size: 15px;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  position: relative;
}

/* === Immersive Background System === */
.background-system {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.gradient-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.6;
  animation: orbFloat 20s ease-in-out infinite;
}

.orb-1 {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(0, 212, 255, 0.2) 0%, transparent 70%);
  top: -10%;
  left: -10%;
  animation-delay: 0s;
}

.orb-2 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(123, 47, 247, 0.2) 0%, transparent 70%);
  bottom: -10%;
  right: -10%;
  animation-delay: -10s;
}

.orb-3 {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.15) 0%, transparent 70%);
  top: 40%;
  right: 20%;
  animation-delay: -5s;
}

@keyframes orbFloat {
  0%, 100% {
    transform: translate(0, 0) scale(1);
  }
  33% {
    transform: translate(30px, -30px) scale(1.1);
  }
  66% {
    transform: translate(-20px, 20px) scale(0.9);
  }
}

.mesh-pattern {
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(rgba(255, 255, 255, 0.02) 1.5px, transparent 1.5px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1.5px, transparent 1.5px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 50% at 50% 50%, black 40%, transparent 100%);
}

.noise-texture {
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' /%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)' opacity='0.03'/%3E%3C/svg%3E");
  opacity: 0.4;
}

/* === Advanced Analysis Loader === */
.analysis-loader {
  position: fixed;
  inset: 0;
  background: rgba(6, 8, 15, 0.98);
  backdrop-filter: blur(24px) saturate(180%);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  animation: fadeIn var(--duration-base) ease;
}

.analysis-loader.active {
  display: flex;
}

.loader-wrapper {
  text-align: center;
  max-width: 480px;
  padding: var(--space-8);
}

/* Neural Processor Animation */
.loader-visual-container {
  position: relative;
  width: 240px;
  height: 240px;
  margin: 0 auto var(--space-10);
}

.neural-processor {
  position: relative;
  width: 100%;
  height: 100%;
}

.processor-rings {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.ring {
  position: absolute;
  border-radius: 50%;
  border: 2px solid;
}

.ring-outer {
  width: 100%;
  height: 100%;
  border-color: rgba(0, 212, 255, 0.2);
  animation: ringRotate 8s linear infinite;
}

.ring-middle {
  width: 75%;
  height: 75%;
  border-color: rgba(123, 47, 247, 0.3);
  animation: ringRotate 6s linear infinite reverse;
}

.ring-inner {
  width: 50%;
  height: 50%;
  border-color: rgba(0, 212, 255, 0.4);
  animation: ringRotate 4s linear infinite;
}

@keyframes ringRotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.processor-core {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 80px;
  height: 80px;
  background: var(--gradient-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-glow-cyan);
  animation: corePulse 2s ease-in-out infinite;
}

@keyframes corePulse {
  0%, 100% {
    transform: translate(-50%, -50%) scale(1);
    box-shadow: 0 0 30px rgba(0, 212, 255, 0.6);
  }
  50% {
    transform: translate(-50%, -50%) scale(1.1);
    box-shadow: 0 0 50px rgba(0, 212, 255, 0.8);
  }
}

.processor-icon {
  width: 36px;
  height: 36px;
  color: white;
  filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.3));
}

.scan-rays {
  position: absolute;
  inset: 0;
}

.ray {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 2px;
  height: 40%;
  background: linear-gradient(to bottom, transparent, var(--color-accent-cyan), transparent);
  transform-origin: center top;
  animation: rayRotate 3s linear infinite;
}

.ray-1 { animation-delay: 0s; }
.ray-2 { animation-delay: 0.75s; }
.ray-3 { animation-delay: 1.5s; }
.ray-4 { animation-delay: 2.25s; }

@keyframes rayRotate {
  from {
    transform: translate(-50%, -100%) rotate(0deg);
    opacity: 0;
  }
  10% {
    opacity: 1;
  }
  90% {
    opacity: 1;
  }
  to {
    transform: translate(-50%, -100%) rotate(360deg);
    opacity: 0;
  }
}

/* Data Particles */
.data-particles {
  position: absolute;
  inset: 0;
}

.particle {
  position: absolute;
  width: 4px;
  height: 4px;
  background: var(--color-accent-cyan);
  border-radius: 50%;
  animation: particleFloat 4s ease-in-out infinite;
}

.particle:nth-child(1) { top: 20%; left: 15%; animation-delay: 0s; }
.particle:nth-child(2) { top: 60%; left: 80%; animation-delay: 0.8s; }
.particle:nth-child(3) { top: 40%; right: 20%; animation-delay: 1.6s; }
.particle:nth-child(4) { bottom: 30%; left: 25%; animation-delay: 2.4s; }
.particle:nth-child(5) { bottom: 15%; right: 35%; animation-delay: 3.2s; }

@keyframes particleFloat {
  0%, 100% {
    transform: translateY(0) scale(1);
    opacity: 0;
  }
  10% {
    opacity: 1;
  }
  50% {
    transform: translateY(-30px) scale(1.2);
    opacity: 0.8;
  }
  90% {
    opacity: 1;
  }
}

/* Loader Status Panel */
.loader-status-panel {
  margin-top: var(--space-8);
}

.loader-heading {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: var(--space-2);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.02em;
}

.loader-subtext {
  font-size: 0.9375rem;
  color: var(--color-text-tertiary);
  margin-bottom: var(--space-8);
}

.analysis-stages {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}

.stage-row {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-primary);
  border-radius: 12px;
  transition: all var(--duration-base) var(--ease-smooth);
}

.stage-row.active {
  background: rgba(0, 212, 255, 0.08);
  border-color: rgba(0, 212, 255, 0.3);
}

.stage-indicator {
  position: relative;
  width: 12px;
  height: 12px;
  flex-shrink: 0;
}

.indicator-dot {
  width: 100%;
  height: 100%;
  background: var(--color-text-subtle);
  border-radius: 50%;
  transition: all var(--duration-base) var(--ease-smooth);
}

.stage-row.active .indicator-dot {
  background: var(--color-accent-cyan);
  box-shadow: 0 0 12px rgba(0, 212, 255, 0.6);
}

.indicator-pulse {
  position: absolute;
  inset: -4px;
  border: 2px solid var(--color-accent-cyan);
  border-radius: 50%;
  opacity: 0;
  animation: indicatorPulse 2s ease-in-out infinite;
}

@keyframes indicatorPulse {
  0% {
    transform: scale(0.8);
    opacity: 1;
  }
  100% {
    transform: scale(1.5);
    opacity: 0;
  }
}

.stage-name {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--duration-base) var(--ease-smooth);
}

.stage-row.active .stage-name {
  color: var(--color-accent-cyan);
  font-weight: 600;
}

/* Progress Bar */
.loader-progress-container {
  margin-top: var(--space-6);
}

.progress-track {
  position: relative;
  height: 6px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 100px;
  overflow: hidden;
}

.progress-fill {
  position: absolute;
  inset: 0;
  background: var(--gradient-primary);
  transform-origin: left;
  animation: progressExpand 3s ease-in-out infinite;
}

.progress-glow {
  position: absolute;
  inset: -2px;
  background: var(--gradient-primary);
  filter: blur(8px);
  opacity: 0.6;
  transform-origin: left;
  animation: progressExpand 3s ease-in-out infinite;
}

@keyframes progressExpand {
  0% {
    transform: scaleX(0);
  }
  100% {
    transform: scaleX(1);
  }
}

/* === Toast Notification System === */
.toast-container {
  position: fixed;
  top: var(--space-8);
  right: var(--space-8);
  z-index: 10000;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  max-width: 420px;
}

.toast {
  background: rgba(31, 45, 74, 0.95);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-secondary);
  border-radius: 16px;
  padding: var(--space-4) var(--space-5);
  display: flex;
  align-items: center;
  gap: var(--space-4);
  box-shadow: var(--shadow-lg);
  animation: toastSlideIn var(--duration-base) var(--ease-smooth),
             toastFadeOut var(--duration-base) var(--ease-smooth) 2.7s forwards;
  position: relative;
  overflow: hidden;
}

.toast::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
  animation: toastProgressBar 3s linear;
}

@keyframes toastSlideIn {
  from {
    transform: translateX(450px);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

@keyframes toastFadeOut {
  to {
    opacity: 0;
    transform: translateX(450px);
  }
}

@keyframes toastProgressBar {
  from {
    transform: scaleX(1);
  }
  to {
    transform: scaleX(0);
    transform-origin: right;
  }
}

.toast-icon {
  font-size: 1.25rem;
  flex-shrink: 0;
}

.toast-message {
  flex: 1;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-primary);
  line-height: 1.5;
}

.toast.success::before {
  background: var(--color-success);
}

.toast.error::before {
  background: var(--color-error);
}

.toast.warning::before {
  background: var(--color-warning);
}

/* === Premium Navigation Header === */
.main-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(10, 14, 26, 0.85);
  backdrop-filter: blur(24px) saturate(180%);
  border-bottom: 1px solid var(--border-primary);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
}

.nav-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--space-5) var(--space-8);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-brand-section {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.brand-logo-wrapper {
  position: relative;
}

.brand-logo {
  width: 52px;
  height: 52px;
  display: block;
}

.brand-identity {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.brand-title {
  font-size: 1.625rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
}

.brand-subtitle {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.nav-status-section {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.system-status-badge {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.3);
  border-radius: 100px;
}

.status-pulse {
  width: 8px;
  height: 8px;
  background: var(--color-success);
  border-radius: 50%;
  position: relative;
  animation: statusPulseAnim 2s ease-in-out infinite;
}

.status-pulse::after {
  content: '';
  position: absolute;
  inset: -4px;
  background: var(--color-success);
  border-radius: 50%;
  opacity: 0;
  animation: statusRipple 2s ease-in-out infinite;
}

@keyframes statusPulseAnim {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.6;
  }
}

@keyframes statusRipple {
  0% {
    transform: scale(0.8);
    opacity: 0.8;
  }
  100% {
    transform: scale(2);
    opacity: 0;
  }
}

.status-text {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-success-light);
  letter-spacing: 0.02em;
}

/* === Main Application Content === */
.app-main {
  position: relative;
  z-index: 1;
  min-height: calc(100vh - 200px);
  padding: var(--space-12) var(--space-8);
}

.content-container {
  max-width: 1280px;
  margin: 0 auto;
}

/* === Mode Selection Screen === */
.mode-selection-screen {
  animation: fadeInUp var(--duration-slower) var(--ease-smooth);
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(40px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-12);
}

.header-content {
  max-width: 720px;
  margin: 0 auto;
}

.section-title {
  margin-bottom: var(--space-4);
}

.title-gradient {
  font-size: 2.75rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.1;
  display: inline-block;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-tertiary);
  line-height: 1.6;
}

/* Mode Cards Grid */
.mode-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(480px, 1fr));
  gap: var(--space-8);
}

.mode-card {
  position: relative;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.03) 0%, rgba(255, 255, 255, 0.01) 100%);
  border: 1px solid var(--border-primary);
  border-radius: 24px;
  padding: var(--space-8);
  cursor: pointer;
  transition: all var(--duration-base) var(--ease-smooth);
  overflow: hidden;
}

.mode-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-surface);
  opacity: 0;
  transition: opacity var(--duration-base) var(--ease-smooth);
  pointer-events: none;
}

.card-glow {
  position: absolute;
  inset: -2px;
  background: var(--gradient-primary);
  border-radius: 24px;
  opacity: 0;
  filter: blur(20px);
  transition: opacity var(--duration-base) var(--ease-smooth);
  z-index: -1;
}

.mode-card:hover {
  border-color: var(--border-active);
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
}

.mode-card:hover::before {
  opacity: 1;
}

.mode-card:hover .card-glow {
  opacity: 0.4;
}

.card-content {
  position: relative;
  z-index: 1;
}

.card-header {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.icon-container {
  position: relative;
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.icon-bg {
  position: absolute;
  inset: 0;
  background: var(--gradient-surface);
  border: 1px solid var(--border-secondary);
  border-radius: 16px;
  transition: all var(--duration-base) var(--ease-smooth);
}

.mode-card:hover .icon-bg {
  background: rgba(0, 212, 255, 0.12);
  border-color: var(--border-active);
  box-shadow: 0 0 24px rgba(0, 212, 255, 0.2);
}

.mode-icon {
  position: relative;
  z-index: 1;
  width: 32px;
  height: 32px;
  color: var(--color-accent-cyan);
  transition: transform var(--duration-base) var(--ease-smooth);
}

.mode-card:hover .mode-icon {
  transform: scale(1.1) rotate(5deg);
}

.card-title {
  font-size: 1.625rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
}

.card-description {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text-tertiary);
  margin-bottom: var(--space-6);
}

.feature-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-bottom: var(--space-8);
}

.feature-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  transition: color var(--duration-fast) var(--ease-smooth);
}

.mode-card:hover .feature-item {
  color: var(--color-text-primary);
}

.feature-icon {
  width: 20px;
  height: 20px;
  color: var(--color-accent-cyan);
  flex-shrink: 0;
}

.mode-action-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-6);
  background: var(--gradient-primary);
  border: none;
  border-radius: 12px;
  font-family: var(--font-primary);
  font-size: 1rem;
  font-weight: 600;
  color: white;
  cursor: pointer;
  transition: all var(--duration-base) var(--ease-smooth);
  box-shadow: 0 4px 16px rgba(0, 212, 255, 0.3);
}

.mode-action-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 212, 255, 0.5);
}

.btn-text {
  flex: 1;
  text-align: left;
}

.btn-arrow {
  width: 24px;
  height: 24px;
  transition: transform var(--duration-base) var(--ease-smooth);
}

.mode-action-btn:hover .btn-arrow {
  transform: translateX(4px);
}

/* === Analysis Configuration === */
.analysis-configuration {
  animation: fadeInUp var(--duration-slower) var(--ease-smooth);
}

/* Workflow Tracker */
.workflow-tracker {
  position: relative;
  margin-bottom: var(--space-12);
  padding: var(--space-8);
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.02) 0%, rgba(255, 255, 255, 0.01) 100%);
  border: 1px solid var(--border-primary);
  border-radius: 20px;
}

.tracker-line {
  position: absolute;
  top: calc(var(--space-8) + 28px);
  left: 15%;
  right: 15%;
  height: 2px;
  background: linear-gradient(90deg, var(--border-secondary) 0%, var(--border-active) 50%, var(--border-secondary) 100%);
}

.tracker-steps {
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: relative;
  z-index: 1;
}

.workflow-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  flex: 1;
}

.step-circle {
  position: relative;
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.circle-inner {
  position: relative;
  z-index: 2;
  width: 48px;
  height: 48px;
  background: var(--color-bg-tertiary);
  border: 2px solid var(--border-secondary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--color-text-muted);
  transition: all var(--duration-base) var(--ease-smooth);
}

.workflow-step.active .circle-inner {
  background: var(--gradient-primary);
  border-color: var(--color-accent-cyan);
  color: white;
  box-shadow: 0 0 24px rgba(0, 212, 255, 0.6);
  animation: stepPulse 2s ease-in-out infinite;
}

@keyframes stepPulse {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
}

.workflow-step.completed .circle-inner {
  background: var(--color-success);
  border-color: var(--color-success);
  color: white;
  box-shadow: 0 0 16px rgba(16, 185, 129, 0.4);
}

.circle-ring {
  position: absolute;
  inset: -4px;
  border: 2px solid var(--color-accent-cyan);
  border-radius: 50%;
  opacity: 0;
  transition: opacity var(--duration-base) var(--ease-smooth);
}

.workflow-step.active .circle-ring {
  opacity: 0.6;
  animation: ringPulse 2s ease-in-out infinite;
}

@keyframes ringPulse {
  0%, 100% {
    transform: scale(1);
    opacity: 0.6;
  }
  50% {
    transform: scale(1.2);
    opacity: 0;
  }
}

.step-label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: color var(--duration-base) var(--ease-smooth);
}

.workflow-step.active .step-label {
  color: var(--color-accent-cyan);
}

.workflow-step.completed .step-label {
  color: var(--color-success);
}

/* Configuration Panels */
.config-panels {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.config-panel {
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.03) 0%, rgba(255, 255, 255, 0.01) 100%);
  border: 1px solid var(--border-primary);
  border-radius: 20px;
  padding: var(--space-6);
  transition: all var(--duration-base) var(--ease-smooth);
}

.config-panel:hover {
  border-color: var(--border-secondary);
  box-shadow: var(--shadow-md);
}

.config-panel:focus-within {
  border-color: var(--border-active);
  box-shadow: 0 0 0 4px rgba(0, 212, 255, 0.1);
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--space-5);
}

.header-left {
  flex: 1;
}

.panel-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--color-text-primary);
  margin-bottom: var(--space-1);
}

.panel-hint {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.language-badge,
.version-badge,
.optional-badge {
  padding: var(--space-1) var(--space-3);
  border-radius: 100px;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.language-badge {
  background: rgba(0, 212, 255, 0.12);
  border: 1px solid rgba(0, 212, 255, 0.3);
  color: var(--color-accent-cyan);
}

.badge-contract {
  background: rgba(168, 85, 247, 0.12);
  border: 1px solid rgba(168, 85, 247, 0.3);
  color: var(--color-accent-violet);
}

.version-badge {
  border: 1px solid var(--border-secondary);
}

.badge-before {
  background: rgba(251, 146, 60, 0.12);
  color: #fb923c;
}

.badge-after {
  background: rgba(34, 197, 94, 0.12);
  color: #22c55e;
}

.optional-badge {
  background: rgba(148, 163, 184, 0.12);
  border: 1px solid rgba(148, 163, 184, 0.3);
  color: var(--color-text-muted);
}

.badge-icon {
  width: 14px;
  height: 14px;
}

.panel-body {
  margin-bottom: var(--space-4);
}

.input-wrapper {
  position: relative;
}

.code-textarea {
  width: 100%;
  min-height: 140px;
  padding: var(--space-4);
  background: var(--color-bg-primary);
  border: 1px solid var(--border-secondary);
  border-radius: 12px;
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--color-text-primary);
  resize: vertical;
  transition: all var(--duration-base) var(--ease-smooth);
}

.code-textarea::placeholder {
  color: var(--color-text-subtle);
}

.code-textarea:focus {
  outline: none;
  border-color: var(--border-active);
  background: var(--color-bg-secondary);
  box-shadow: 0 0 0 4px rgba(0, 212, 255, 0.08);
}

.panel-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 var(--space-1);
}

.char-counter {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--color-text-subtle);
}

.input-tip {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.tip-icon {
  width: 16px;
  height: 16px;
}

/* Constraints Panel */
.constraints-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-4);
}

.constraint-option {
  cursor: pointer;
}

.constraint-checkbox {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.constraint-card {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-4);
  background: var(--color-bg-primary);
  border: 1px solid var(--border-secondary);
  border-radius: 12px;
  transition: all var(--duration-base) var(--ease-smooth);
  cursor: pointer;
}

.constraint-card:hover {
  border-color: var(--border-active);
  background: var(--color-bg-secondary);
}

.constraint-checkbox:checked + .constraint-card {
  border-color: var(--border-active);
  background: rgba(0, 212, 255, 0.06);
  box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.08);
}

.checkbox-visual {
  width: 24px;
  height: 24px;
  border: 2px solid var(--border-secondary);
  border-radius: 6px;
  background: var(--color-bg-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all var(--duration-base) var(--ease-smooth);
}

.constraint-checkbox:checked + .constraint-card .checkbox-visual {
  background: var(--gradient-primary);
  border-color: var(--color-accent-cyan);
}

.check-icon {
  width: 16px;
  height: 16px;
  color: white;
  opacity: 0;
  transform: scale(0);
  transition: all var(--duration-base) var(--ease-bounce);
}

.constraint-checkbox:checked + .constraint-card .check-icon {
  opacity: 1;
  transform: scale(1);
}

.constraint-info {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.constraint-title {
  font-weight: 600;
  font-size: 0.9375rem;
  color: var(--color-text-primary);
}

.constraint-description {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  line-height: 1.4;
}

/* Control Bar */
.control-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-4);
  margin-top: var(--space-8);
  padding: var(--space-6);
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.02) 0%, rgba(255, 255, 255, 0.01) 100%);
  border: 1px solid var(--border-primary);
  border-radius: 20px;
}

.control-left,
.control-right {
  display: flex;
  gap: var(--space-3);
  align-items: center;
}

.control-btn {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  border-radius: 12px;
  font-family: var(--font-primary);
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--duration-base) var(--ease-smooth);
  border: none;
  position: relative;
  overflow: hidden;
}

.btn-icon {
  width: 20px;
  height: 20px;
  transition: transform var(--duration-base) var(--ease-smooth);
}

.btn-primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: 0 4px 16px rgba(0, 212, 255, 0.3);
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 212, 255, 0.5);
}

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.btn-shimmer {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  transform: translateX(-100%);
  animation: shimmer 2s infinite;
}

@keyframes shimmer {
  100% {
    transform: translateX(100%);
  }
}

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

.btn-secondary:hover {
  background: var(--color-bg-elevated);
  border-color: var(--border-active);
}

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

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

/* Results Display */
.results-display {
  margin-top: var(--space-12);
  animation: fadeInUp var(--duration-slower) var(--ease-smooth);
}

.results-header-bar {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--border-primary);
}

.results-title-section {
  flex: 1;
}

.results-title {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-2);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.results-subtitle {
  font-size: 0.9375rem;
  color: var(--color-text-tertiary);
}

.results-actions {
  display: flex;
  gap: var(--space-3);
}

.export-btn {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  background: var(--color-bg-tertiary);
  border: 1px solid var(--border-secondary);
  border-radius: 10px;
  font-family: var(--font-primary);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--duration-base) var(--ease-smooth);
}

.export-btn:hover {
  background: var(--color-bg-elevated);
  border-color: var(--border-active);
  color: var(--color-text-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.export-icon {
  width: 18px;
  height: 18px;
}

.results-container {
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.03) 0%, rgba(255, 255, 255, 0.01) 100%);
  border: 1px solid var(--border-primary);
  border-radius: 20px;
  padding: var(--space-8);
  min-height: 200px;
}

.results-container.status-pass {
  border-color: rgba(16, 185, 129, 0.4);
  box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.08);
}

.results-container.status-fail {
  border-color: rgba(239, 68, 68, 0.4);
  box-shadow: 0 0 0 4px rgba(239, 68, 68, 0.08);
}

/* === Enhanced Footer === */
.app-footer {
  position: relative;
  z-index: 1;
  margin-top: var(--space-16);
  padding: var(--space-8) var(--space-8) var(--space-6);
  border-top: 1px solid var(--border-primary);
  background: linear-gradient(180deg, transparent 0%, rgba(10, 14, 26, 0.8) 100%);
  backdrop-filter: blur(12px);
}

.footer-container {
  max-width: 1280px;
  margin: 0 auto;
}

.footer-content {
  text-align: center;
}

.footer-brand {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2);
}

.footer-tech {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

/* === Responsive Design === */
@media (max-width: 1024px) {
  .mode-cards-grid {
    grid-template-columns: 1fr;
  }
  
  .tracker-line {
    display: none;
  }
  
  .tracker-steps {
    flex-wrap: wrap;
    gap: var(--space-6);
  }
}

@media (max-width: 768px) {
  :root {
    font-size: 14px;
  }
  
  .app-main {
    padding: var(--space-8) var(--space-4);
  }
  
  .nav-container {
    padding: var(--space-4);
  }
  
  .brand-logo {
    width: 44px;
    height: 44px;
  }
  
  .brand-title {
    font-size: 1.375rem;
  }
  
  .title-gradient {
    font-size: 2rem;
  }
  
  .section-subtitle {
    font-size: 1rem;
  }
  
  .mode-cards-grid {
    gap: var(--space-6);
  }
  
  .mode-card {
    padding: var(--space-6);
  }
  
  .workflow-tracker {
    padding: var(--space-6);
  }
  
  .config-panel {
    padding: var(--space-5);
  }
  
  .control-bar {
    flex-direction: column;
    align-items: stretch;
  }
  
  .control-left,
  .control-right {
    width: 100%;
    justify-content: space-between;
  }
  
  .control-btn {
    flex: 1;
    justify-content: center;
  }
  
  .results-header-bar {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-4);
  }
  
  .results-actions {
    width: 100%;
    justify-content: stretch;
  }
  
  .export-btn {
    flex: 1;
    justify-content: center;
  }
  
  .toast-container {
    right: var(--space-4);
    left: var(--space-4);
    max-width: none;
  }
}

@media (max-width: 480px) {
  .constraints-grid {
    grid-template-columns: 1fr;
  }
  
  .workflow-step {
    flex: 0 0 auto;
  }
  
  .step-circle {
    width: 48px;
    height: 48px;
  }
  
  .circle-inner {
    width: 40px;
    height: 40px;
    font-size: 1rem;
  }
  
  .step-label {
    font-size: 0.75rem;
  }
}

/* === Utility Animations === */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes slideInRight {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

@keyframes slideInLeft {
  from {
    transform: translateX(-100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

/* === Accessibility === */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* === Focus Styles === */
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--color-accent-cyan);
  outline-offset: 2px;
}

/* === Selection Styles === */
::selection {
  background: rgba(0, 212, 255, 0.3);
  color: var(--color-text-primary);
}

/* === Scrollbar Styles === */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--color-bg-elevated);
  border-radius: 10px;
  border: 2px solid var(--color-bg-secondary);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-bg-surface);
}

/* === Print Styles === */
@media print {
  .background-system,
  .main-header,
  .app-footer,
  .control-bar,
  .analysis-loader {
    display: none;
  }
  
  body {
    background: white;
    color: black;
  }
}