/* 
 * style.css
 * Custom stylesheet for Expense Tracker PWA
 * Enhances Tailwind CSS with premium animations, custom glassmorphism, and bottom sheets.
 */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

:root {
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  
  /* HSL Color Tokens - Light Mode (GoPay/OVO Inspired) */
  --background: 210 40% 98%;
  --foreground: 222 47% 11%;
  --card: 0 0% 100%;
  --card-foreground: 222 47% 11%;
  --popover: 0 0% 100%;
  --popover-foreground: 222 47% 11%;
  
  --primary: 156 100% 36%; /* Emerald / GoPay Green */
  --primary-foreground: 210 40% 98%;
  
  --secondary: 210 40% 96.1%;
  --secondary-foreground: 222 47% 11.2%;
  
  --muted: 210 40% 96.1%;
  --muted-foreground: 215.4 16.3% 46.9%;
  
  --accent: 210 40% 96.1%;
  --accent-foreground: 222 47% 11.2%;
  
  --destructive: 0 84.2% 60.2%;
  --destructive-foreground: 210 40% 98%;
  
  --border: 214.3 31.8% 91.4%;
  --input: 214.3 31.8% 91.4%;
  --ring: 156 100% 36%;
  
  --radius-card: 24px;
  --radius-button: 9999px;
  
  --glass-bg: rgba(255, 255, 255, 0.65);
  --glass-border: rgba(255, 255, 255, 0.4);
  --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.04);
}

.dark {
  /* HSL Color Tokens - Dark Mode */
  --background: 222 47% 6%;
  --foreground: 210 40% 98%;
  --card: 222 47% 10%;
  --card-foreground: 210 40% 98%;
  --popover: 222 47% 9%;
  --popover-foreground: 210 40% 98%;
  
  --primary: 156 100% 40%;
  --primary-foreground: 222 47% 6%;
  
  --secondary: 217.2 32.6% 17.5%;
  --secondary-foreground: 210 40% 98%;
  
  --muted: 217.2 32.6% 17.5%;
  --muted-foreground: 215 20.2% 65.1%;
  
  --accent: 217.2 32.6% 17.5%;
  --accent-foreground: 210 40% 98%;
  
  --destructive: 0 62.8% 30.6%;
  --destructive-foreground: 210 40% 98%;
  
  --border: 217.2 32.6% 17.5%;
  --input: 217.2 32.6% 17.5%;
  --ring: 156 100% 40%;
  
  --glass-bg: rgba(15, 23, 42, 0.65);
  --glass-border: rgba(255, 255, 255, 0.08);
  --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
}

body {
  font-family: var(--font-primary);
  background-color: hsl(var(--background));
  color: hsl(var(--foreground));
  overflow-x: hidden;
  transition: background-color 0.3s ease, color 0.3s ease;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

/* Glassmorphism Elements */
.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
  border-radius: var(--radius-card);
}

.glass-nav {
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-top: 1px solid rgba(0, 0, 0, 0.05);
}

.dark .glass-nav {
  background: rgba(15, 23, 42, 0.8);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

/* Bottom Sheet Container & Animations */
.bottom-sheet-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 50;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1), visibility 0.3s;
}

.bottom-sheet-overlay.active {
  opacity: 1;
  visibility: visible;
}

.bottom-sheet {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  max-width: 28rem; /* Equivalent to max-w-md */
  margin-left: auto;
  margin-right: auto;
  background-color: hsl(var(--card));
  border-top-left-radius: 30px;
  border-top-right-radius: 30px;
  box-shadow: 0 -10px 40px -10px rgba(0, 0, 0, 0.15);
  border: 1px solid var(--glass-border);
  z-index: 51;
  transform: translateY(100%);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  max-height: 90vh;
  display: flex;
  flex-direction: column;
}

.bottom-sheet.active {
  transform: translateY(0);
}

/* Scrollbar styling */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: hsl(var(--muted-foreground) / 0.2);
  border-radius: 9999px;
}

::-webkit-scrollbar-thumb:hover {
  background: hsl(var(--muted-foreground) / 0.4);
}

/* Page transitions */
.page-view {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.25s ease-out, transform 0.25s ease-out;
  display: none;
}

.page-view.active {
  display: block;
  opacity: 1;
  transform: translateY(0);
}

/* Dynamic Buttons */
.btn-primary {
  background-color: hsl(var(--primary));
  color: hsl(var(--primary-foreground));
  font-weight: 600;
  border-radius: var(--radius-button);
  transition: all 0.2s ease;
  box-shadow: 0 4px 14px 0 rgba(16, 185, 129, 0.3);
}

.btn-primary:active {
  transform: scale(0.96);
  opacity: 0.9;
}

/* Floating Action Button Pulse */
@keyframes fab-pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.4);
  }
  70% {
    box-shadow: 0 0 0 10px rgba(16, 185, 129, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0);
  }
}

.fab-btn {
  animation: fab-pulse 2s infinite;
}

/* Custom Calculator Keys */
.calc-key {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  font-weight: 600;
  height: 3.5rem;
  border-radius: 16px;
  background-color: hsl(var(--secondary));
  color: hsl(var(--secondary-foreground));
  transition: background-color 0.1s ease, transform 0.1s ease;
}

.calc-key:active {
  background-color: hsl(var(--muted-foreground) / 0.2);
  transform: scale(0.95);
}

.calc-key-op {
  background-color: hsl(var(--primary) / 0.15);
  color: hsl(var(--primary));
}

.calc-key-action {
  background-color: hsl(var(--primary));
  color: hsl(var(--primary-foreground));
}

/* File Upload Area Drag & Drop */
.upload-zone {
  border: 2px dashed hsl(var(--border));
  border-radius: 16px;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.upload-zone.dragover {
  border-color: hsl(var(--primary));
  background-color: hsl(var(--primary) / 0.05);
}

/* PIN Screen Input Dots */
.pin-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 2px solid hsl(var(--muted-foreground));
  transition: background-color 0.15s ease, border-color 0.15s ease, transform 0.15s ease;
}

.pin-dot.filled {
  background-color: hsl(var(--primary));
  border-color: hsl(var(--primary));
  transform: scale(1.25);
}

/* Skeleton Loading Shimmer */
@keyframes shimmer {
  0% {
    background-position: -200% 0;
  }
  100% {
    background-position: 200% 0;
  }
}

.skeleton-loader {
  background: linear-gradient(90deg, 
    hsl(var(--muted) / 0.6) 25%, 
    hsl(var(--muted) / 0.9) 37%, 
    hsl(var(--muted) / 0.6) 63%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: 8px;
}