/*
═══════════════════════════════════════════════════════════════
  Civic Issue Urgency Classifier - iOS 26 Liquid Design
  Inspired by Apple's latest design language
═══════════════════════════════════════════════════════════════
*/

/* ============================================
   ROOT VARIABLES - Black, White & Gray Palette
   ============================================ */
:root {
  /* Primary Colors - Black, White & Gray */
  --primary-gradient: linear-gradient(135deg, #333333 0%, #1a1a1a 100%);
  --secondary-gradient: linear-gradient(135deg, #666666 0%, #4d4d4d 100%);
  --success-gradient: linear-gradient(135deg, #555555 0%, #404040 100%);
  --danger-gradient: linear-gradient(135deg, #2a2a2a 0%, #1f1f1f 100%);
  
  /* Glass Colors */
  --glass-white: rgba(255, 255, 255, 0.08);
  --glass-white-hover: rgba(255, 255, 255, 0.12);
  --glass-dark: rgba(0, 0, 0, 0.3);
  --glass-border: rgba(255, 255, 255, 0.12);
  
  /* Text Colors */
  --text-primary: #f5f5f5;
  --text-secondary: #a0a0a0;
  --text-white: #ffffff;
  --text-muted: rgba(255, 255, 255, 0.6);
  
  /* Background */
  --bg-primary: #0a0a0a;
  --bg-secondary: #161616;
  --bg-card: rgba(255, 255, 255, 0.04);
  
  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.25);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
  --shadow-xl: 0 16px 64px rgba(0, 0, 0, 0.35);
  
  /* Urgency Colors - Grayscale */
  --urgency-high: #2a2a2a;
  --urgency-medium: #4d4d4d;
  --urgency-low: #707070;
  
  /* Radius */
  --radius-sm: 12px;
  --radius-md: 20px;
  --radius-lg: 28px;
  --radius-xl: 40px;
  
  /* Spacing */
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 24px;
  --spacing-lg: 32px;
  --spacing-xl: 48px;
  
  /* Animation */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* ============================================
   GLOBAL RESET & BASE STYLES
   ============================================ */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', 
               Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background: linear-gradient(135deg, #0a0a0a 0%, #1a1a1a 50%, #2a2a2a 100%);
  background-attachment: fixed;
  color: var(--text-white);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
}

/* ============================================
   GLASSMORPHISM EFFECTS
   ============================================ */
.glass {
  background: var(--glass-white);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-lg);
}

.glass-dark {
  background: var(--glass-dark);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
}

.glass-card {
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(30px) saturate(180%);
  -webkit-backdrop-filter: blur(30px) saturate(180%);
  border: 1px solid rgba(255, 255, 255, 0.125);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  transition: all var(--transition-normal);
}

.glass-card:hover {
  background: rgba(255, 255, 255, 0.12);
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

/* ============================================
   NAVIGATION BAR
   ============================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: var(--spacing-sm) var(--spacing-lg);
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(40px) saturate(150%);
  -webkit-backdrop-filter: blur(40px) saturate(150%);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  transition: all var(--transition-normal);
}

.navbar.scrolled {
  background: rgba(255, 255, 255, 0.1);
  box-shadow: var(--shadow-md);
}

.navbar-container {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-white);
  text-decoration: none;
  transition: transform var(--transition-fast);
}

.navbar-brand:hover {
  transform: scale(1.05);
}

.navbar-menu {
  display: flex;
  gap: var(--spacing-md);
  list-style: none;
}

.navbar-link {
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  position: relative;
}

.navbar-link:hover {
  color: var(--text-white);
  background: rgba(255, 255, 255, 0.1);
}

.navbar-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 30px;
  height: 3px;
  background: var(--primary-gradient);
  border-radius: 2px;
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-xl) var(--spacing-lg);
  padding-top: 100px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 20% 50%, rgba(100, 100, 100, 0.15), transparent 50%),
              radial-gradient(circle at 80% 80%, rgba(80, 80, 80, 0.15), transparent 50%);
  animation: float 20s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-20px); }
}

.hero-content {
  text-align: center;
  max-width: 900px;
  position: relative;
  z-index: 1;
}

.hero-title {
  font-size: clamp(2.5rem, 8vw, 5rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: var(--spacing-md);
  background: linear-gradient(135deg, #ffffff 0%, #d0d0d0 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: fadeInUp 0.8s ease;
}

.hero-subtitle {
  font-size: clamp(1.1rem, 3vw, 1.5rem);
  color: var(--text-muted);
  margin-bottom: var(--spacing-xl);
  font-weight: 400;
  animation: fadeInUp 1s ease;
}

.hero-buttons {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 1.2s ease;
}

/* ============================================
   BUTTONS - iOS 26 Style
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: 16px 32px;
  border: none;
  border-radius: var(--radius-md);
  font-size: 1.05rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
  width: 300px;
  height: 300px;
}

.btn-primary {
  background: var(--primary-gradient);
  color: var(--text-white);
  box-shadow: 0 8px 24px rgba(50, 50, 50, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(50, 50, 50, 0.6);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-white);
  border: 2px solid rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.3);
  transform: translateY(-2px);
}

.btn-large {
  padding: 20px 40px;
  font-size: 1.15rem;
}

/* ============================================
   FEATURE CARDS
   ============================================ */
.features {
  padding: var(--spacing-xl) var(--spacing-lg);
  max-width: 1400px;
  margin: 0 auto;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.feature-card {
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: all var(--transition-normal);
  cursor: pointer;
}

.feature-card:hover {
  background: rgba(255, 255, 255, 0.08);
  transform: translateY(-8px);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.3);
}

.feature-icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-sm);
  display: inline-block;
  animation: bounce 2s infinite;
}

.feature-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-xs);
  color: var(--text-white);
}

.feature-description {
  color: var(--text-muted);
  line-height: 1.7;
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* ============================================
   CLASSIFICATION FORM
   ============================================ */
.classifier-section {
  padding: var(--spacing-xl) var(--spacing-lg);
  max-width: 900px;
  margin: 0 auto;
}

.form-container {
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(30px) saturate(180%);
  border: 1px solid rgba(255, 255, 255, 0.125);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-xl);
}

.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-label {
  display: block;
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
  color: var(--text-white);
  font-size: 1.05rem;
}

.form-input,
.form-textarea {
  width: 100%;
  padding: 16px 20px;
  border-radius: var(--radius-md);
  border: 2px solid rgba(255, 255, 255, 0.1);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-white);
  font-size: 1rem;
  font-family: inherit;
  transition: all var(--transition-normal);
  backdrop-filter: blur(10px);
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: rgba(200, 200, 200, 0.5);
  background: rgba(255, 255, 255, 0.08);
  box-shadow: 0 0 0 4px rgba(150, 150, 150, 0.1);
}

.form-textarea {
  min-height: 150px;
  resize: vertical;
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: rgba(255, 255, 255, 0.4);
}

.char-count {
  text-align: right;
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-top: var(--spacing-xs);
}

/* ============================================
   RESULT DISPLAY
   ============================================ */
.result-container {
  margin-top: var(--spacing-xl);
  animation: slideInUp 0.5s ease;
}

.result-card {
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(30px);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.urgency-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: 12px 24px;
  border-radius: var(--radius-lg);
  font-size: 1.25rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: var(--spacing-md);
  animation: pulse 2s infinite;
}

.urgency-high {
  background: linear-gradient(135deg, #2a2a2a 0%, #1a1a1a 100%);
  box-shadow: 0 8px 24px rgba(42, 42, 42, 0.5);
}

.urgency-medium {
  background: linear-gradient(135deg, #4d4d4d 0%, #3a3a3a 100%);
  box-shadow: 0 8px 24px rgba(77, 77, 77, 0.4);
}

.urgency-low {
  background: linear-gradient(135deg, #707070 0%, #5a5a5a 100%);
  box-shadow: 0 8px 24px rgba(112, 112, 112, 0.3);
}

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

.result-details {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.detail-item {
  padding: var(--spacing-md);
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.detail-label {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: var(--spacing-xs);
  text-transform: uppercase;
  letter-spacing: 1px;
  font-weight: 600;
}

.detail-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-white);
}

.progress-bar {
  height: 8px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 4px;
  overflow: hidden;
  margin-top: var(--spacing-xs);
}

.progress-fill {
  height: 100%;
  background: var(--primary-gradient);
  border-radius: 4px;
  transition: width 1s ease;
  animation: shimmer 2s infinite;
}

@keyframes shimmer {
  0% { background-position: -1000px 0; }
  100% { background-position: 1000px 0; }
}

/* ============================================
   LOADING ANIMATION
   ============================================ */
.loading {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: var(--spacing-xl);
}

.loading-spinner {
  width: 60px;
  height: 60px;
  border: 4px solid rgba(255, 255, 255, 0.1);
  border-top: 4px solid var(--text-white);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInUp {
  from {
    opacity: 0;
    transform: translateY(50px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 768px) {
  .navbar-menu {
    display: none;
  }
  
  .hero {
    padding: var(--spacing-lg) var(--spacing-sm);
    padding-top: 80px;
  }
  
  .hero-title {
    font-size: 2.5rem;
  }
  
  .hero-buttons {
    flex-direction: column;
  }
  
  .btn {
    width: 100%;
    justify-content: center;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .form-container {
    padding: var(--spacing-md);
  }
  
  .result-details {
    grid-template-columns: 1fr;
  }
}

/* ============================================
   UTILITY CLASSES
   ============================================ */
.text-center {
  text-align: center;
}

.mt-lg {
  margin-top: var(--spacing-lg);
}

.mb-lg {
  margin-bottom: var(--spacing-lg);
}

.hidden {
  display: none !important;
}

.fade-in {
  animation: fadeInUp 0.6s ease;
}