/* =======================================================
   KONG'S TEA - MODERN 2025 DESIGN SYSTEM
   Cutting-edge UI with glassmorphism, micro-interactions,
   and immersive experiences while preserving brand identity
   ======================================================= */

/* CSS Variables for Vintage Design System */
:root {
  /* Brand Colors - Vintage Palette */
  --brand-primary: #c48a4a;
  --brand-secondary: #8b5a2b;
  --brand-accent: #a67c52;
  
  /* Vintage Color Palette */
  --color-primary: #c48a4a;
  --color-primary-light: #d4a574;
  --color-primary-dark: #a67c52;
  --color-primary-alpha: rgba(196, 138, 74, 0.1);
  --color-primary-alpha-20: rgba(196, 138, 74, 0.2);
  --color-primary-alpha-60: rgba(196, 138, 74, 0.6);
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #c48a4a, #8b5a2b);
  --gradient-secondary: linear-gradient(135deg, #a67c52, #73513a);
  --gradient-glass: linear-gradient(135deg, rgba(251,244,228,0.25), rgba(240,226,207,0.1));
  --gradient-hero: linear-gradient(135deg, rgba(196,138,74,0.1), rgba(139,90,43,0.05));
  
  /* Neutral Colors - Vintage */
  --color-white: #fbf4e4;
  --color-black: #3c2c23;
  --color-gray-50: #fbf4e4;
  --color-gray-100: #f0e2cf;
  --color-gray-200: #e3d6c7;
  --color-gray-300: #d1c0aa;
  --color-gray-400: #a67c52;
  --color-gray-500: #8b5a2b;
  --color-gray-600: #73513a;
  --color-gray-700: #5c3d24;
  --color-gray-800: #43352b;
  --color-gray-900: #3c2c23;
  
  /* Semantic Colors */
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  --color-info: #3b82f6;
  
  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-secondary: 'Dancing Script', cursive;
  --font-heading: 'Poppins', sans-serif;
  
  /* Font Sizes - Fluid Typography */
  --text-xs: clamp(0.75rem, 0.5vw + 0.5rem, 0.875rem);
  --text-sm: clamp(0.875rem, 0.75vw + 0.625rem, 1rem);
  --text-base: clamp(1rem, 1vw + 0.75rem, 1.125rem);
  --text-lg: clamp(1.125rem, 1.25vw + 0.875rem, 1.25rem);
  --text-xl: clamp(1.25rem, 1.5vw + 1rem, 1.5rem);
  --text-2xl: clamp(1.5rem, 2vw + 1.125rem, 2rem);
  --text-3xl: clamp(1.875rem, 2.5vw + 1.375rem, 2.5rem);
  --text-4xl: clamp(2.25rem, 3vw + 1.625rem, 3rem);
  --text-5xl: clamp(3rem, 4vw + 2rem, 4rem);
  
  /* Spacing System */
  --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;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-3xl: 2rem;
  --radius-full: 9999px;
  
  /* Shadows - Enhanced for 2025 */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  --shadow-glow: 0 0 20px rgba(196, 138, 74, 0.3);
  --shadow-glow-strong: 0 0 40px rgba(196, 138, 74, 0.5);
  
  /* Glass Effects */
  --glass-bg: rgba(255, 255, 255, 0.1);
  --glass-border: rgba(255, 255, 255, 0.2);
  --glass-backdrop: blur(20px);
  
  /* Transitions */
  --transition-fast: 0.15s ease-out;
  --transition-base: 0.3s ease-out;
  --transition-slow: 0.5s ease-out;
  --transition-bounce: 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  --transition-smooth: 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  
  /* Z-index Scale */
  --z-dropdown: 1000;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
  --z-overlay: 9999;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-primary);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-gray-800);
  background-color: var(--color-white);
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
}

/* Modern Glassmorphism Components */
.glass {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-backdrop);
  -webkit-backdrop-filter: var(--glass-backdrop);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
}

.glass-card {
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-2xl);
  padding: var(--space-8);
  box-shadow: var(--shadow-xl);
  transition: all var(--transition-smooth);
}

.glass-card:hover {
  background: rgba(255, 255, 255, 0.25);
  transform: translateY(-5px);
  box-shadow: var(--shadow-2xl);
}

/* Modern Button System */
.btn-modern {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-8);
  font-family: var(--font-primary);
  font-weight: 600;
  font-size: var(--text-base);
  text-decoration: none;
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-bounce);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.btn-modern::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  transition: left var(--transition-slow);
}

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

.btn-primary {
  background: var(--gradient-primary);
  color: var(--color-white);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.btn-primary:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: var(--shadow-2xl), var(--shadow-glow-strong);
  color: var(--color-white);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.9);
  color: var(--color-gray-800);
  border: 2px solid var(--color-primary);
  box-shadow: var(--shadow-md);
}

.btn-secondary:hover {
  background: var(--color-primary);
  color: var(--color-white);
  transform: translateY(-3px) scale(1.02);
  box-shadow: var(--shadow-xl);
}

.btn-ghost {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn-ghost:hover {
  background: var(--color-primary);
  color: var(--color-white);
  transform: translateY(-2px);
}

/* Micro-interactions */
.hover-lift {
  transition: transform var(--transition-base);
}

.hover-lift:hover {
  transform: translateY(-5px);
}

.hover-scale {
  transition: transform var(--transition-base);
}

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

.hover-glow {
  transition: all var(--transition-base);
}

.hover-glow:hover {
  box-shadow: var(--shadow-glow);
}

/* Modern Cards */
.card-modern {
  background: var(--color-white);
  border-radius: var(--radius-2xl);
  padding: var(--space-8);
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-smooth);
  border: 1px solid var(--color-gray-100);
  position: relative;
  overflow: hidden;
}

.card-modern::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transition: transform var(--transition-base);
}

.card-modern:hover::before {
  transform: scaleX(1);
}

.card-modern:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-2xl);
}

/* Typography Modern */
.heading-modern {
  font-family: var(--font-heading);
  font-weight: 800;
  letter-spacing: -0.025em;
  line-height: 1.1;
  margin-bottom: var(--space-6);
}

.heading-1 {
  font-size: var(--text-5xl);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.heading-2 {
  font-size: var(--text-4xl);
  color: var(--color-gray-900);
}

.heading-3 {
  font-size: var(--text-3xl);
  color: var(--color-gray-800);
}

.text-gradient {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Modern Grid System */
.grid-modern {
  display: grid;
  gap: var(--space-8);
}

.grid-1 { grid-template-columns: 1fr; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 768px) {
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
}

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

@keyframes fadeInScale {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

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

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

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

/* Animation Classes */
.animate-fade-in-up {
  animation: fadeInUp 0.6s ease-out;
}

.animate-fade-in-scale {
  animation: fadeInScale 0.6s ease-out;
}

.animate-float {
  animation: float 3s ease-in-out infinite;
}

.animate-pulse {
  animation: pulse 2s ease-in-out infinite;
}

.animate-spin {
  animation: spin 1s linear infinite;
}

/* Intersection Observer Animation Classes */
.reveal {
  opacity: 0;
  transform: translateY(50px);
  transition: all 0.8s ease-out;
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

.reveal-scale {
  opacity: 0;
  transform: scale(0.95);
  transition: all 0.8s ease-out;
}

.reveal-scale.active {
  opacity: 1;
  transform: scale(1);
}

/* Modern Form Elements */
.form-modern {
  background: var(--color-white);
  border-radius: var(--radius-2xl);
  padding: var(--space-8);
  box-shadow: var(--shadow-lg);
}

.input-modern {
  width: 100%;
  padding: var(--space-4) var(--space-6);
  border: 2px solid var(--color-gray-200);
  border-radius: var(--radius-xl);
  font-size: var(--text-base);
  transition: all var(--transition-base);
  background: var(--color-gray-50);
}

.input-modern:focus {
  outline: none;
  border-color: var(--color-primary);
  background: var(--color-white);
  box-shadow: 0 0 0 3px var(--color-primary-alpha);
}

/* Utility Classes */
.container-modern {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.section-modern {
  padding: var(--space-24) 0;
}

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.hidden { display: none; }
.block { display: block; }
.flex { display: flex; }
.grid { display: grid; }

.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }

.w-full { width: 100%; }
.h-full { height: 100%; }

.mb-4 { margin-bottom: var(--space-4); }
.mb-8 { margin-bottom: var(--space-8); }
.mt-4 { margin-top: var(--space-4); }
.mt-8 { margin-top: var(--space-8); }

.p-4 { padding: var(--space-4); }
.p-8 { padding: var(--space-8); }

/* Loading States */
.loading {
  position: relative;
  color: transparent;
}

.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 20px;
  margin: -10px 0 0 -10px;
  border: 2px solid var(--color-gray-300);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

/* Responsive Design Helpers */
@media (max-width: 640px) {
  .section-modern {
    padding: var(--space-16) 0;
  }
  
  .container-modern {
    padding: 0 var(--space-4);
  }
  
  .btn-modern {
    padding: var(--space-3) var(--space-6);
    font-size: var(--text-sm);
  }
}

/* Print Styles */
@media print {
  .btn-modern,
  .glass,
  .glass-card {
    background: transparent !important;
    box-shadow: none !important;
  }
}

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

/* High contrast mode */
@media (prefers-contrast: high) {
  .glass,
  .glass-card {
    background: var(--color-white);
    border: 2px solid var(--color-gray-800);
  }
}

/* Focus visible styles for accessibility */
.btn-modern:focus-visible,
.input-modern:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}