/* =======================================================
   KONG'S TEA - MODERN 2026 DESIGN SYSTEM
   Clean, modern UI replacing vintage aesthetic
   ======================================================= */

/* CSS Variables — Modern Palette */
:root {
  /* Brand Colors — Modern */
  --brand-primary: #F97316;
  --brand-secondary: #0F172A;
  --brand-accent: #06B6D4;

  /* Primary Palette — Vibrant Orange */
  --color-primary: #F97316;
  --color-primary-light: #FB923C;
  --color-primary-lighter: #FDBA74;
  --color-primary-dark: #EA580C;
  --color-primary-darker: #C2410C;
  --color-primary-50: #FFF7ED;
  --color-primary-100: #FFEDD5;
  --color-primary-alpha: rgba(249, 115, 22, 0.1);
  --color-primary-alpha-20: rgba(249, 115, 22, 0.2);
  --color-primary-alpha-60: rgba(249, 115, 22, 0.6);

  /* Accent — Cyan/Teal */
  --accent-primary: #06B6D4;
  --accent-light: #22D3EE;
  --accent-dark: #0891B2;
  --accent-alpha: rgba(6, 182, 212, 0.1);
  --accent-alpha-20: rgba(6, 182, 212, 0.2);
  --accent-alpha-60: rgba(6, 182, 212, 0.6);

  /* Neutrals — Slate */
  --color-white: #FFFFFF;
  --color-black: #0F172A;
  --color-gray-50: #F8FAFC;
  --color-gray-100: #F1F5F9;
  --color-gray-200: #E2E8F0;
  --color-gray-300: #CBD5E1;
  --color-gray-400: #94A3B8;
  --color-gray-500: #64748B;
  --color-gray-600: #475569;
  --color-gray-700: #334155;
  --color-gray-800: #1E293B;
  --color-gray-900: #0F172A;

  /* Semantic Colors */
  --color-success: #10B981;
  --color-warning: #F59E0B;
  --color-error: #EF4444;
  --color-info: #3B82F6;

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #F97316, #EA580C);
  --gradient-secondary: linear-gradient(135deg, #1E293B, #334155);
  --gradient-accent: linear-gradient(135deg, #06B6D4, #0891B2);
  --gradient-hero: linear-gradient(135deg, rgba(15, 23, 42, 0.75), rgba(15, 23, 42, 0.3));
  --gradient-glass: linear-gradient(135deg, rgba(255, 255, 255, 0.25), rgba(255, 255, 255, 0.1));
  --gradient-mixed: linear-gradient(135deg, #F97316, #06B6D4);
  --gradient-dark: linear-gradient(135deg, #0F172A, #1E293B);

  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-heading: 'Inter', sans-serif;
  --font-secondary: 'Inter', 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 */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --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: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.25rem;
  --radius-2xl: 1.5rem;
  --radius-3xl: 2rem;
  --radius-full: 9999px;

  /* Shadows — Modern & Clean */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.08);
  --shadow-xl: 0 16px 40px rgba(0, 0, 0, 0.1);
  --shadow-2xl: 0 24px 60px rgba(0, 0, 0, 0.15);
  --shadow-glow: 0 0 24px rgba(249, 115, 22, 0.25);
  --shadow-glow-strong: 0 0 48px rgba(249, 115, 22, 0.4);
  --shadow-accent-glow: 0 0 24px rgba(6, 182, 212, 0.25);
  --shadow-accent-glow-strong: 0 0 48px rgba(6, 182, 212, 0.4);

  /* Glass Effects */
  --glass-bg: rgba(255, 255, 255, 0.8);
  --glass-bg-light: rgba(255, 255, 255, 0.6);
  --glass-bg-strong: rgba(255, 255, 255, 0.92);
  --glass-border: rgba(255, 255, 255, 0.4);
  --glass-backdrop: blur(20px);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.06);

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
  --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 */
  --z-dropdown: 1000;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
  --z-overlay: 9999;
}

/* ======= BASE RESET ======= */
*, *::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;
}

/* ======= GLASS 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);
  box-shadow: var(--glass-shadow);
}

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

.glass-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
}

/* ======= 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-base);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
}

.btn-modern::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left var(--transition-slow);
}

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

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

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

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

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

/* ======= MODERN CARDS ======= */
.card-modern {
  background: var(--color-white);
  border-radius: var(--radius-2xl);
  padding: var(--space-8);
  box-shadow: var(--shadow-md);
  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(-6px);
  box-shadow: var(--shadow-xl);
}

/* ======= TYPOGRAPHY ======= */
.heading-modern {
  font-family: var(--font-heading);
  font-weight: 800;
  letter-spacing: -0.025em;
  line-height: 1.1;
}

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

.text-accent {
  color: var(--accent-primary);
}

/* ======= 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); }
}

.animate-fade-in-up { animation: fadeInUp 0.6s ease-out; }
.animate-float { animation: float 3s ease-in-out infinite; }
.animate-pulse { animation: pulse 2s ease-in-out infinite; }

/* ======= REVEAL ANIMATIONS ======= */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

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

.reveal-left {
  opacity: 0;
  transform: translateX(-50px);
  transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-left.active {
  opacity: 1;
  transform: translateX(0);
}

.reveal-right {
  opacity: 0;
  transform: translateX(50px);
  transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-right.active {
  opacity: 1;
  transform: translateX(0);
}

/* Stagger Support */
.stagger-item {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s cubic-bezier(0.16, 1, 0.3, 1);
  transition-delay: calc(var(--stagger-index, 0) * 0.12s);
}

.stagger-item.active,
.stagger-item.animate {
  opacity: 1;
  transform: translateY(0);
}

.stagger-slow .stagger-item {
  transition-delay: calc(var(--stagger-index, 0) * 0.15s);
}

/* ======= HOVER EFFECTS ======= */
.hover-lift { transition: transform var(--transition-base); }
.hover-lift:hover { transform: translateY(-5px); }

.hover-glow-accent { transition: all var(--transition-smooth); }
.hover-glow-accent:hover {
  box-shadow: var(--shadow-lg), var(--shadow-accent-glow);
}

/* ======= UTILITIES ======= */
.text-center { text-align: center; }
.hidden { display: none; }
.flex { display: flex; }
.grid { display: grid; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.w-full { width: 100%; }

/* ======= RESPONSIVE ======= */
@media (max-width: 640px) {
  .btn-modern {
    padding: var(--space-3) var(--space-6);
    font-size: var(--text-sm);
  }
}

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