/**
 * NexusCalc - Immersive Construction Calculator
 * Cyber-Construction Hologram Design System
 */

/* ============================================
   CSS Variables & Design Tokens
   ============================================ */
:root {
  /* Core Colors */
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-tertiary: #1a1a2e;
  --bg-gradient-start: #0a0a0f;
  --bg-gradient-end: #1a1a2e;
  
  /* Neon Accents */
  --neon-cyan: #00f5ff;
  --neon-cyan-glow: rgba(0, 245, 255, 0.5);
  --neon-purple: #9d4edd;
  --neon-purple-glow: rgba(157, 78, 221, 0.5);
  --neon-green: #00ffab;
  --neon-green-glow: rgba(0, 255, 171, 0.5);
  --neon-pink: #ff006e;
  --neon-pink-glow: rgba(255, 0, 110, 0.5);
  
  /* Text Colors */
  --text-primary: rgba(255, 255, 255, 0.95);
  --text-secondary: rgba(255, 255, 255, 0.7);
  --text-muted: rgba(255, 255, 255, 0.5);
  --text-accent: #00f5ff;
  
  /* Glass Effects */
  --glass-bg: rgba(20, 20, 40, 0.4);
  --glass-bg-strong: rgba(20, 20, 40, 0.7);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-border-strong: rgba(0, 245, 255, 0.3);
  --glass-blur: blur(20px);
  --glass-blur-strong: blur(30px);
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  
  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 30px;
  --radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
  --transition-bounce: 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  
  /* Shadows */
  --shadow-neon-cyan: 0 0 20px rgba(0, 245, 255, 0.4), 0 0 40px rgba(0, 245, 255, 0.2);
  --shadow-neon-purple: 0 0 20px rgba(157, 78, 221, 0.4), 0 0 40px rgba(157, 78, 221, 0.2);
  --shadow-neon-green: 0 0 20px rgba(0, 255, 171, 0.4), 0 0 40px rgba(0, 255, 171, 0.2);
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'Space Grotesk', 'Exo 2', -apple-system, BlinkMacSystemFont, sans-serif;
  background: radial-gradient(ellipse at top, var(--bg-gradient-end) 0%, var(--bg-gradient-start) 50%, #000 100%);
  background-attachment: fixed;
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

/* Particle Background Canvas */
#particles-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
}

/* Floating Geometric Shapes */
.floating-shapes {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
  overflow: hidden;
}

.shape {
  position: absolute;
  opacity: 0.03;
  animation: float 20s infinite ease-in-out;
}

.shape-hex {
  width: 100px;
  height: 100px;
  background: linear-gradient(135deg, var(--neon-cyan), var(--neon-purple));
  clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
}

.shape-circle {
  width: 150px;
  height: 150px;
  border: 2px solid var(--neon-cyan);
  border-radius: 50%;
}

.shape-line {
  width: 200px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--neon-purple), transparent);
}

@keyframes float {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-30px) rotate(180deg); }
}

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4, h5, h6 {
  font-family: 'Orbitron', 'Space Grotesk', sans-serif;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.02em;
}

h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  background: linear-gradient(135deg, var(--neon-cyan), var(--neon-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

h2 {
  font-size: clamp(1.5rem, 4vw, 2.5rem);
}

h3 {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
}

.glitch-text {
  position: relative;
  animation: glitch 3s infinite;
}

.glitch-text::before,
.glitch-text::after {
  content: attr(data-text);
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.glitch-text::before {
  animation: glitch-1 2s infinite linear alternate-reverse;
  color: var(--neon-cyan);
  z-index: -1;
}

.glitch-text::after {
  animation: glitch-2 3s infinite linear alternate-reverse;
  color: var(--neon-pink);
  z-index: -2;
}

@keyframes glitch {
  0%, 90%, 100% { transform: translate(0); }
  92% { transform: translate(-2px, 2px); }
  94% { transform: translate(2px, -2px); }
  96% { transform: translate(-2px, -2px); }
  98% { transform: translate(2px, 2px); }
}

@keyframes glitch-1 {
  0%, 100% { clip-path: inset(0 0 0 0); transform: translate(0); }
  20% { clip-path: inset(20% 0 60% 0); transform: translate(-2px, 2px); }
  40% { clip-path: inset(40% 0 40% 0); transform: translate(2px, -2px); }
  60% { clip-path: inset(60% 0 20% 0); transform: translate(-2px, -2px); }
  80% { clip-path: inset(80% 0 0 0); transform: translate(2px, 2px); }
}

@keyframes glitch-2 {
  0%, 100% { clip-path: inset(0 0 0 0); transform: translate(0); }
  20% { clip-path: inset(60% 0 20% 0); transform: translate(2px, -2px); }
  40% { clip-path: inset(40% 0 40% 0); transform: translate(-2px, 2px); }
  60% { clip-path: inset(20% 0 60% 0); transform: translate(2px, 2px); }
  80% { clip-path: inset(0 0 80% 0); transform: translate(-2px, -2px); }
}

/* ============================================
   Layout
   ============================================ */
.app-container {
  position: relative;
  z-index: 10;
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--space-lg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ============================================
   Header
   ============================================ */
.main-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-lg) 0;
  margin-bottom: var(--space-xl);
  border-bottom: 1px solid var(--glass-border);
  position: relative;
}

.main-header::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--neon-cyan), var(--neon-purple), transparent);
  animation: borderFlow 3s linear infinite;
}

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

.logo-icon {
  font-size: 2.5rem;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); filter: drop-shadow(0 0 10px var(--neon-cyan-glow)); }
  50% { transform: scale(1.1); filter: drop-shadow(0 0 20px var(--neon-cyan-glow)); }
}

/* ============================================
   Neon Buttons
   ============================================ */
.neon-btn {
  position: relative;
  padding: var(--space-sm) var(--space-lg);
  background: transparent;
  border: 2px solid var(--neon-cyan);
  color: var(--neon-cyan);
  font-family: 'Orbitron', sans-serif;
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  cursor: pointer;
  overflow: hidden;
  transition: all var(--transition-normal);
  border-radius: var(--radius-sm);
}

.neon-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, var(--neon-cyan-glow), transparent);
  transition: left 0.5s;
}

.neon-btn:hover::before {
  left: 100%;
}

.neon-btn:hover {
  background: var(--neon-cyan-glow);
  color: var(--bg-primary);
  box-shadow: var(--shadow-neon-cyan);
  transform: translateY(-2px);
}

.neon-btn-purple {
  border-color: var(--neon-purple);
  color: var(--neon-purple);
}

.neon-btn-purple:hover {
  background: var(--neon-purple-glow);
  box-shadow: var(--shadow-neon-purple);
}

.neon-btn-green {
  border-color: var(--neon-green);
  color: var(--neon-green);
}

.neon-btn-green:hover {
  background: var(--neon-green-glow);
  box-shadow: var(--shadow-neon-green);
}

/* ============================================
   Glass Cards (Glassmorphism 2.0)
   ============================================ */
.glass-card {
  position: relative;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  overflow: hidden;
  transition: all var(--transition-normal);
}

.glass-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(0, 245, 255, 0.05), rgba(157, 78, 221, 0.05));
  opacity: 0;
  transition: opacity var(--transition-normal);
  pointer-events: none;
}

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

.glass-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-neon-cyan), var(--shadow-card);
  border-color: var(--glass-border-strong);
}

/* Animated Border Flow */
.glow-border {
  position: relative;
}

.glow-border::before {
  content: '';
  position: absolute;
  inset: -2px;
  background: linear-gradient(45deg, var(--neon-cyan), var(--neon-purple), var(--neon-green), var(--neon-cyan));
  background-size: 400% 400%;
  border-radius: calc(var(--radius-lg) + 2px);
  z-index: -1;
  animation: gradientFlow 4s ease infinite;
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.glow-border:hover::before {
  opacity: 1;
}

@keyframes gradientFlow {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

/* ============================================
   Hologram Navigation
   ============================================ */
.hologram-nav {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
  padding: var(--space-sm);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full);
  overflow-x: auto;
  scrollbar-width: none;
}

.hologram-nav::-webkit-scrollbar {
  display: none;
}

.nav-item {
  position: relative;
  padding: var(--space-md) var(--space-lg);
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-family: 'Orbitron', sans-serif;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition-normal);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.nav-item::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--neon-cyan-glow), var(--neon-purple-glow));
  opacity: 0;
  transition: opacity var(--transition-normal);
  border-radius: var(--radius-full);
}

.nav-item:hover {
  color: var(--text-primary);
  transform: translateY(-2px);
}

.nav-item:hover::before {
  opacity: 0.2;
}

.nav-item.active {
  color: var(--neon-cyan);
  text-shadow: 0 0 10px var(--neon-cyan-glow);
}

.nav-item.active::before {
  opacity: 0.3;
}

.nav-item.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 20%;
  right: 20%;
  height: 2px;
  background: var(--neon-cyan);
  box-shadow: 0 0 10px var(--neon-cyan);
  animation: navGlow 2s infinite;
}

@keyframes navGlow {
  0%, 100% { opacity: 1; box-shadow: 0 0 5px var(--neon-cyan); }
  50% { opacity: 0.5; box-shadow: 0 0 15px var(--neon-cyan), 0 0 25px var(--neon-cyan); }
}

/* ============================================
   Calculator Sections
   ============================================ */
.calculator-section {
  display: none;
  opacity: 0;
  transform: scale(0.95);
  transition: all var(--transition-slow);
}

.calculator-section.active {
  display: block;
  opacity: 1;
  transform: scale(1);
  animation: sectionAppear 0.5s ease;
}

@keyframes sectionAppear {
  0% {
    opacity: 0;
    transform: scale(0.9) translateY(20px);
    filter: blur(10px);
  }
  50% {
    filter: blur(5px);
  }
  100% {
    opacity: 1;
    transform: scale(1) translateY(0);
    filter: blur(0);
  }
}

/* ============================================
   Form Elements
   ============================================ */
.form-group {
  margin-bottom: var(--space-lg);
}

.form-label {
  display: block;
  margin-bottom: var(--space-sm);
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.form-input {
  width: 100%;
  padding: var(--space-md);
  background: var(--glass-bg-strong);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: 'JetBrains Mono', monospace;
  font-size: 1rem;
  transition: all var(--transition-normal);
}

.form-input:focus {
  outline: none;
  border-color: var(--neon-cyan);
  box-shadow: 0 0 0 3px var(--neon-cyan-glow), inset 0 0 20px rgba(0, 245, 255, 0.1);
}

.form-input::placeholder {
  color: var(--text-muted);
}

/* Animated Input Underline */
.input-animated {
  position: relative;
}

.input-animated::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--neon-cyan), var(--neon-purple));
  transition: all var(--transition-normal);
}

.input-animated:focus-within::after {
  left: 0;
  width: 100%;
}

/* ============================================
   Range Slider
   ============================================ */
.range-slider {
  -webkit-appearance: none;
  width: 100%;
  height: 6px;
  background: var(--glass-bg-strong);
  border-radius: var(--radius-full);
  outline: none;
}

.range-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  background: linear-gradient(135deg, var(--neon-cyan), var(--neon-purple));
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 0 10px var(--neon-cyan-glow);
  transition: all var(--transition-fast);
}

.range-slider::-webkit-slider-thumb:hover {
  transform: scale(1.2);
  box-shadow: 0 0 20px var(--neon-cyan-glow), 0 0 40px var(--neon-purple-glow);
}

/* ============================================
   Results Display
   ============================================ */
.result-display {
  padding: var(--space-xl);
  background: linear-gradient(135deg, rgba(0, 245, 255, 0.1), rgba(157, 78, 221, 0.1));
  border: 1px solid var(--glass-border-strong);
  border-radius: var(--radius-lg);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.result-display::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.05), transparent);
  animation: shimmer 3s infinite;
}

@keyframes shimmer {
  0% { transform: translateX(-100%) rotate(45deg); }
  100% { transform: translateX(100%) rotate(45deg); }
}

.result-value {
  font-family: 'Orbitron', sans-serif;
  font-size: clamp(2rem, 6vw, 4rem);
  font-weight: 700;
  background: linear-gradient(135deg, var(--neon-cyan), var(--neon-green));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: 0 0 30px var(--neon-cyan-glow);
}

/* ============================================
   Progress Bar (Liquid Metal)
   ============================================ */
.progress-container {
  width: 100%;
  height: 8px;
  background: var(--glass-bg-strong);
  border-radius: var(--radius-full);
  overflow: hidden;
  position: relative;
}

.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--neon-cyan), var(--neon-purple), var(--neon-green));
  background-size: 200% 100%;
  border-radius: var(--radius-full);
  transition: width var(--transition-slow);
  position: relative;
  animation: progressFlow 2s linear infinite;
}

.progress-bar::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 20px;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.5));
  filter: blur(4px);
}

@keyframes progressFlow {
  0% { background-position: 0% 50%; }
  100% { background-position: 200% 50%; }
}

/* ============================================
   Mobile Navigation
   ============================================ */
.mobile-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--glass-bg-strong);
  backdrop-filter: var(--glass-blur-strong);
  border-top: 1px solid var(--glass-border);
  padding: var(--space-sm) var(--space-md);
  z-index: 1000;
  display: none;
}

.mobile-nav-list {
  display: flex;
  justify-content: space-around;
  list-style: none;
}

.mobile-nav-item {
  flex: 1;
}

.mobile-nav-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm);
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.75rem;
  transition: all var(--transition-fast);
  border-radius: var(--radius-md);
}

.mobile-nav-link:hover,
.mobile-nav-link.active {
  color: var(--neon-cyan);
}

.mobile-nav-link.active {
  background: var(--neon-cyan-glow);
}

.mobile-nav-icon {
  font-size: 1.5rem;
  transition: transform var(--transition-bounce);
}

.mobile-nav-link:hover .mobile-nav-icon,
.mobile-nav-link.active .mobile-nav-icon {
  transform: scale(1.2);
  filter: drop-shadow(0 0 8px var(--neon-cyan));
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
  .app-container {
    padding: var(--space-md);
    padding-bottom: 80px;
  }
  
  .main-header {
    flex-direction: column;
    gap: var(--space-md);
    text-align: center;
  }
  
  .hologram-nav {
    border-radius: var(--radius-lg);
  }
  
  .nav-item {
    padding: var(--space-sm) var(--space-md);
    font-size: 0.75rem;
  }
  
  .mobile-nav {
    display: block;
  }
  
  .glass-card {
    padding: var(--space-lg);
  }
}

/* ============================================
   Loading Animation
   ============================================ */
.loading-spinner {
  width: 60px;
  height: 60px;
  position: relative;
  margin: var(--space-xl) auto;
}

.loading-spinner::before,
.loading-spinner::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 3px solid transparent;
}

.loading-spinner::before {
  border-top-color: var(--neon-cyan);
  border-right-color: var(--neon-purple);
  animation: spin 1s linear infinite;
}

.loading-spinner::after {
  border-bottom-color: var(--neon-green);
  border-left-color: var(--neon-pink);
  animation: spin 1.5s linear infinite reverse;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ============================================
   Scrollbar
   ============================================ */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

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

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--neon-cyan), var(--neon-purple));
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(180deg, var(--neon-purple), var(--neon-green));
}

/* ============================================
   Selection
   ============================================ */
::selection {
  background: var(--neon-cyan-glow);
  color: var(--bg-primary);
}