/**
 * AI-Focused Modern CSS Theme
 * =================================
 * A sleek, modern design system for AI-focused websites
 * 
 * Color Palette:
 * - Primary: Black (#000000, #0a0a0a, #1a1a1a)
 * - Secondary: White (#ffffff, #f8f8f8, #f0f0f0)
 * - Accent: Purple (#8b5cf6, #7c3aed, #a78bfa)
 * 
 * Design Principles:
 * - Thin, crisp lines
 * - Smooth transitions (300ms standard)
 * - Generous white space
 * - High contrast for readability
 * - Subtle animations on interactions
 * 
 * Inspired by: Anthropic, Apple, MiniMax
 * Created: May 7, 2026
 */

/* =================================
   CSS CUSTOM PROPERTIES (VARIABLES)
   ================================= */

:root {
  /* Color System - Primary Blacks */
  --color-black-pure: #000000;
  --color-black-rich: #0a0a0a;
  --color-black-soft: #1a1a1a;
  --color-black-muted: #2a2a2a;
  
  /* Color System - Whites */
  --color-white-pure: #ffffff;
  --color-white-warm: #f8f8f8;
  --color-white-cool: #f0f0f0;
  --color-white-muted: #e8e8e8;
  
  /* Color System - Purple Accents */
  --color-purple-primary: #8b5cf6;
  --color-purple-dark: #7c3aed;
  --color-purple-light: #a78bfa;
  --color-purple-subtle: #c4b5fd;
  --color-purple-pale: #ede9fe;
  
  /* Grays for subtle elements */
  --color-gray-100: #f7f7f7;
  --color-gray-200: #e5e5e5;
  --color-gray-300: #d4d4d4;
  --color-gray-400: #a3a3a3;
  --color-gray-500: #737373;
  --color-gray-600: #525252;
  --color-gray-700: #404040;
  --color-gray-800: #262626;
  --color-gray-900: #171717;
  
  /* Typography System */
  --font-family-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 
                         'Helvetica Neue', Arial, sans-serif;
  --font-family-mono: 'SF Mono', 'Monaco', 'Inconsolata', 'Fira Code', 
                      'Courier New', monospace;
  
  /* Font Sizes - Modular Scale (1.250 - Major Third) */
  --font-size-xs: 0.64rem;      /* 10.24px */
  --font-size-sm: 0.8rem;       /* 12.8px */
  --font-size-base: 1rem;       /* 16px */
  --font-size-md: 1.25rem;      /* 20px */
  --font-size-lg: 1.563rem;     /* 25px */
  --font-size-xl: 1.953rem;     /* 31.25px */
  --font-size-2xl: 2.441rem;    /* 39px */
  --font-size-3xl: 3.052rem;    /* 48.8px */
  --font-size-4xl: 3.815rem;    /* 61px */
  --font-size-5xl: 4.768rem;    /* 76.3px */
  
  /* Font Weights */
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* Line Heights */
  --line-height-tight: 1.2;
  --line-height-snug: 1.375;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.625;
  --line-height-loose: 2;
  
  /* Letter Spacing */
  --letter-spacing-tight: -0.025em;
  --letter-spacing-normal: 0em;
  --letter-spacing-wide: 0.025em;
  --letter-spacing-wider: 0.05em;
  
  /* Spacing System - Based on 8px grid */
  --space-1: 0.25rem;   /* 4px */
  --space-2: 0.5rem;    /* 8px */
  --space-3: 0.75rem;   /* 12px */
  --space-4: 1rem;      /* 16px */
  --space-5: 1.5rem;    /* 24px */
  --space-6: 2rem;      /* 32px */
  --space-8: 3rem;      /* 48px */
  --space-10: 4rem;     /* 64px */
  --space-12: 6rem;     /* 96px */
  --space-16: 8rem;     /* 128px */
  --space-20: 10rem;    /* 160px */
  
  /* Border Properties */
  --border-width-thin: 1px;
  --border-width-medium: 2px;
  --border-width-thick: 3px;
  
  --border-radius-none: 0;
  --border-radius-sm: 0.25rem;   /* 4px */
  --border-radius-md: 0.5rem;    /* 8px */
  --border-radius-lg: 0.75rem;   /* 12px */
  --border-radius-xl: 1rem;      /* 16px */
  --border-radius-2xl: 1.5rem;   /* 24px */
  --border-radius-full: 9999px;
  
  /* Transition Properties */
  --transition-fast: 150ms;
  --transition-base: 300ms;
  --transition-slow: 500ms;
  --transition-slower: 700ms;
  
  --transition-timing: cubic-bezier(0.4, 0, 0.2, 1);
  --transition-timing-in: cubic-bezier(0.4, 0, 1, 1);
  --transition-timing-out: cubic-bezier(0, 0, 0.2, 1);
  --transition-timing-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
  
  /* Shadow System - Subtle and modern */
  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  
  /* Purple-tinted shadows for accents */
  --shadow-purple-sm: 0 2px 8px rgba(139, 92, 246, 0.15);
  --shadow-purple-md: 0 4px 16px rgba(139, 92, 246, 0.2);
  --shadow-purple-lg: 0 8px 24px rgba(139, 92, 246, 0.25);
  
  /* Z-Index Scale */
  --z-index-dropdown: 1000;
  --z-index-sticky: 1020;
  --z-index-fixed: 1030;
  --z-index-modal-backdrop: 1040;
  --z-index-modal: 1050;
  --z-index-popover: 1060;
  --z-index-tooltip: 1070;
  
  /* Container Widths */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
  --container-2xl: 1536px;
}

/* =================================
   BASE & RESET STYLES
   ================================= */

/**
 * Modern CSS Reset
 * Provides a consistent baseline across browsers
 */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-family-primary);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-normal);
  color: var(--color-black-rich);
  background-color: var(--color-black-pure);
  overflow-x: hidden;
  min-height: 100vh;
}

/* =================================
   TYPOGRAPHY
   ================================= */

/**
 * Heading Styles
 * Progressive scaling with tight line-height for impact
 */

h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  letter-spacing: var(--letter-spacing-tight);
  color: var(--color-black-pure);
  margin-bottom: var(--space-4);
}

h1 {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
}

h2 {
  font-size: var(--font-size-3xl);
}

h3 {
  font-size: var(--font-size-2xl);
}

h4 {
  font-size: var(--font-size-xl);
}

h5 {
  font-size: var(--font-size-lg);
}

h6 {
  font-size: var(--font-size-md);
}

/**
 * Paragraph and Text Styles
 */

p {
  margin-bottom: var(--space-4);
  color: var(--color-gray-700);
  line-height: var(--line-height-relaxed);
}

.text-large {
  font-size: var(--font-size-lg);
  line-height: var(--line-height-normal);
}

.text-small {
  font-size: var(--font-size-sm);
}

.text-xs {
  font-size: var(--font-size-xs);
}

/**
 * Text Utilities
 */

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

.font-light { font-weight: var(--font-weight-light); }
.font-normal { font-weight: var(--font-weight-normal); }
.font-medium { font-weight: var(--font-weight-medium); }
.font-semibold { font-weight: var(--font-weight-semibold); }
.font-bold { font-weight: var(--font-weight-bold); }

.text-black { color: var(--color-black-pure); }
.text-gray { color: var(--color-gray-600); }
.text-purple { color: var(--color-purple-primary); }
.text-white { color: var(--color-white-pure); }

/**
 * Links
 * Smooth transitions with subtle purple accent
 */

a {
  color: var(--color-black-rich);
  text-decoration: none;
  transition: color var(--transition-base) var(--transition-timing);
  position: relative;
}

a:hover {
  color: var(--color-purple-primary);
}

a.link-underlined {
  text-decoration: underline;
  text-decoration-color: var(--color-purple-light);
  text-decoration-thickness: var(--border-width-thin);
  text-underline-offset: 4px;
}

a.link-underlined:hover {
  text-decoration-color: var(--color-purple-primary);
}

/* =================================
   LAYOUT COMPONENTS
   ================================= */

/**
 * Container System
 * Responsive containers with proper padding
 */

.container {
  width: 100%;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

.container-sm { max-width: var(--container-sm); }
.container-md { max-width: var(--container-md); }
.container-lg { max-width: var(--container-lg); }
.container-xl { max-width: var(--container-xl); }
.container-2xl { max-width: var(--container-2xl); }

/**
 * Section Spacing
 * Consistent vertical rhythm
 */

.section {
  padding-top: var(--space-16);
  padding-bottom: var(--space-16);
}

.section-sm {
  padding-top: var(--space-8);
  padding-bottom: var(--space-8);
}

.section-lg {
  padding-top: var(--space-20);
  padding-bottom: var(--space-20);
}

/* =================================
   NAVIGATION
   ================================= */

/**
 * Modern Navigation Bar
 * Thin borders, smooth transitions, backdrop blur
 */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-index-sticky);
  background-color: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: var(--border-width-thin) solid var(--color-gray-200);
  transition: all var(--transition-base) var(--transition-timing);
}

.navbar-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-4);
  padding-bottom: var(--space-4);
  max-width: var(--container-2xl);
  margin: 0 auto;
  padding-left: var(--space-6);
  padding-right: var(--space-6);
}

.navbar-logo {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-black-pure);
  letter-spacing: var(--letter-spacing-tight);
  transition: color var(--transition-base) var(--transition-timing);
}

.navbar-logo:hover {
  color: var(--color-purple-primary);
}

.navbar-menu {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  list-style: none;
}

.navbar-link {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-gray-600);
  letter-spacing: var(--letter-spacing-wide);
  text-transform: uppercase;
  transition: all var(--transition-base) var(--transition-timing);
  padding: var(--space-2) 0;
  position: relative;
}

.navbar-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: var(--border-width-thin);
  background-color: var(--color-purple-primary);
  transition: width var(--transition-base) var(--transition-timing);
}

.navbar-link:hover {
  color: var(--color-purple-primary);
}

.navbar-link:hover::after {
  width: 100%;
}

.navbar-link.active {
  color: var(--color-black-pure);
}

/* Navbar scroll effect */
.navbar.scrolled {
  background-color: rgba(255, 255, 255, 0.95);
  box-shadow: var(--shadow-sm);
}

/* =================================
   BUTTONS
   ================================= */

/**
 * Button Base
 * Clean, modern buttons with smooth transitions
 */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-family: var(--font-family-primary);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  line-height: 1;
  text-align: center;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  user-select: none;
  border: var(--border-width-thin) solid transparent;
  border-radius: var(--border-radius-md);
  padding: var(--space-3) var(--space-6);
  transition: all var(--transition-base) var(--transition-timing);
  outline: none;
  position: relative;
  overflow: hidden;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/**
 * Button Variants
 */

/* Primary Button - Purple accent */
.btn-primary {
  color: var(--color-white-pure);
  background-color: var(--color-purple-primary);
  border-color: var(--color-purple-primary);
}

.btn-primary:hover:not(:disabled) {
  background-color: var(--color-purple-dark);
  border-color: var(--color-purple-dark);
  box-shadow: var(--shadow-purple-md);
  transform: translateY(-2px);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(0);
}

/* Secondary Button - Outlined */
.btn-secondary {
  color: var(--color-black-pure);
  background-color: transparent;
  border-color: var(--color-gray-300);
}

.btn-secondary:hover:not(:disabled) {
  border-color: var(--color-gray-900);
  color: var(--color-gray-900);
  background-color: var(--color-gray-100);
}

/* Ghost Button - Minimal */
.btn-ghost {
  color: var(--color-gray-700);
  background-color: transparent;
  border-color: transparent;
}

.btn-ghost:hover:not(:disabled) {
  color: var(--color-gray-900);
  background-color: var(--color-gray-100);
}

/* Text Button - No background */
.btn-text {
  color: var(--color-gray-700);
  background-color: transparent;
  border-color: transparent;
  padding: var(--space-2) var(--space-3);
}

.btn-text:hover:not(:disabled) {
  color: var(--color-gray-900);
  text-decoration: underline;
}

/**
 * Button Sizes
 */

.btn-sm {
  font-size: var(--font-size-sm);
  padding: var(--space-2) var(--space-4);
}

.btn-lg {
  font-size: var(--font-size-md);
  padding: var(--space-4) var(--space-8);
}

.btn-full {
  width: 100%;
}

/* =================================
   CARDS
   ================================= */

/**
 * Modern Card Component
 * Clean borders, subtle shadows, smooth hover effects
 */

.card {
  background-color: var(--color-white-pure);
  border: var(--border-width-thin) solid var(--color-gray-200);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  transition: all var(--transition-base) var(--transition-timing);
}

.card:hover {
  border-color: var(--color-gray-300);
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

.card-header {
  padding: var(--space-6);
  border-bottom: var(--border-width-thin) solid var(--color-gray-200);
}

.card-body {
  padding: var(--space-6);
}

.card-footer {
  padding: var(--space-6);
  border-top: var(--border-width-thin) solid var(--color-gray-200);
  background-color: var(--color-gray-100);
}

.card-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-black-pure);
  margin-bottom: var(--space-2);
}

.card-subtitle {
  font-size: var(--font-size-sm);
  color: var(--color-gray-600);
  margin-bottom: var(--space-4);
}

/**
 * Card Variants
 */

.card-elevated {
  border: none;
  box-shadow: var(--shadow-lg);
}

.card-elevated:hover {
  box-shadow: var(--shadow-xl);
}

.card-purple {
  border-color: var(--color-gray-300);
  background: linear-gradient(135deg, var(--color-white-pure) 0%, var(--color-gray-50) 100%);
}

.card-purple:hover {
  border-color: var(--color-gray-400);
  box-shadow: var(--shadow-lg);
}

/* =================================
   FORM ELEMENTS
   ================================= */

/**
 * Input Fields
 * Clean design with focus states
 */

.form-group {
  margin-bottom: var(--space-5);
}

.form-label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-gray-700);
  margin-bottom: var(--space-2);
  letter-spacing: var(--letter-spacing-wide);
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  font-family: var(--font-family-primary);
  font-size: var(--font-size-base);
  color: var(--color-black-rich);
  background-color: var(--color-white-pure);
  border: var(--border-width-thin) solid var(--color-gray-300);
  border-radius: var(--border-radius-md);
  padding: var(--space-3) var(--space-4);
  transition: all var(--transition-base) var(--transition-timing);
  outline: none;
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  border-color: var(--color-purple-primary);
  box-shadow: 0 0 0 3px var(--color-purple-pale);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--color-gray-400);
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
}

/**
 * Checkbox and Radio
 */

.form-check {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

.form-check-input {
  width: 20px;
  height: 20px;
  border: var(--border-width-thin) solid var(--color-gray-300);
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  transition: all var(--transition-base) var(--transition-timing);
}

.form-check-input:checked {
  background-color: var(--color-purple-primary);
  border-color: var(--color-purple-primary);
}

.form-check-label {
  font-size: var(--font-size-sm);
  color: var(--color-gray-700);
  cursor: pointer;
}

/* =================================
   UTILITIES
   ================================= */

/**
 * Spacing Utilities
 */

.mt-1 { margin-top: var(--space-1); }
.mt-2 { margin-top: var(--space-2); }
.mt-3 { margin-top: var(--space-3); }
.mt-4 { margin-top: var(--space-4); }
.mt-5 { margin-top: var(--space-5); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mt-10 { margin-top: var(--space-10); }
.mt-12 { margin-top: var(--space-12); }

.mb-1 { margin-bottom: var(--space-1); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-3 { margin-bottom: var(--space-3); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-5 { margin-bottom: var(--space-5); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }
.mb-10 { margin-bottom: var(--space-10); }
.mb-12 { margin-bottom: var(--space-12); }

.pt-8 { padding-top: var(--space-8); }
.pt-10 { padding-top: var(--space-10); }
.pt-12 { padding-top: var(--space-12); }
.pt-16 { padding-top: var(--space-16); }
.pt-20 { padding-top: var(--space-20); }

.pb-8 { padding-bottom: var(--space-8); }
.pb-10 { padding-bottom: var(--space-10); }
.pb-12 { padding-bottom: var(--space-12); }
.pb-16 { padding-bottom: var(--space-16); }
.pb-20 { padding-bottom: var(--space-20); }

/**
 * Display Utilities
 */

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

/**
 * Flexbox Utilities
 */

.flex-row { flex-direction: row; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-around { justify-content: space-around; }
.justify-start { justify-content: flex-start; }
.justify-end { justify-content: flex-end; }

.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-5 { gap: var(--space-5); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

/**
 * Grid Utilities
 */

.grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
.grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

/* =================================
   ANIMATIONS
   ================================= */

/**
 * Fade In Animation
 */

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeIn var(--transition-slow) var(--transition-timing);
}

/**
 * Slide In Animation
 */

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.slide-in-left {
  animation: slideInLeft var(--transition-base) var(--transition-timing);
}

/**
 * Pulse Animation - For accent elements
 */

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.7;
  }
}

.pulse {
  animation: pulse 2s var(--transition-timing) infinite;
}

/**
 * Gradient Animation - For backgrounds
 */

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

.gradient-animated {
  background: linear-gradient(
    -45deg,
    var(--color-purple-pale),
    var(--color-purple-light),
    var(--color-purple-primary),
    var(--color-purple-dark)
  );
  background-size: 400% 400%;
  animation: gradientShift 15s ease infinite;
}

/**
 * Parallax Scroll Effects - Revolut Style
 */

@keyframes parallaxFloat {
  0%, 100% {
    transform: translateY(0) scale(1);
  }
  50% {
    transform: translateY(-20px) scale(1.02);
  }
}

.parallax-float {
  animation: parallaxFloat 8s ease-in-out infinite;
}

/**
 * Scroll-triggered animations
 */

.scroll-reveal {
  opacity: 0;
  transform: translateY(50px);
  transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.scroll-reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

.scroll-reveal-left {
  opacity: 0;
  transform: translateX(-50px);
  transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.scroll-reveal-right {
  opacity: 0;
  transform: translateX(50px);
  transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.scroll-reveal-scale {
  opacity: 0;
  transform: scale(0.9);
  transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/**
 * Stagger delay utilities for sequential animations
 */

.delay-100 { transition-delay: 100ms; }
.delay-200 { transition-delay: 200ms; }
.delay-300 { transition-delay: 300ms; }
.delay-400 { transition-delay: 400ms; }
.delay-500 { transition-delay: 500ms; }

/* =================================
   SECTION BACKGROUNDS - REVOLUT STYLE
   ================================= */

/**
 * Full-width alternating black and white sections
 * Content is centered but backgrounds bleed to edges
 */

.section-white {
  background-color: var(--color-white-pure);
  color: var(--color-black-rich);
}

.section-black {
  background-color: var(--color-black-pure);
  color: var(--color-white-pure);
}

.section-black h1,
.section-black h2,
.section-black h3,
.section-black h4,
.section-black h5,
.section-black h6 {
  color: var(--color-white-pure);
}

.section-black p {
  color: var(--color-gray-300);
}

.section-black .card {
  background-color: var(--color-gray-900);
  border-color: var(--color-gray-800);
}

.section-black .card:hover {
  border-color: var(--color-gray-600);
}

/* Full-width section container */
.section-full {
  width: 100%;
  position: relative;
  overflow: hidden;
}

/* =================================
   HERO SECTION
   ================================= */

/**
 * Hero Section - Large impact header
 */

.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-20) var(--space-6);
  overflow: hidden;
  background: var(--color-black-pure);
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: transparent;
  opacity: 0;
  z-index: -1;
}

.hero-content {
  max-width: var(--container-lg);
  z-index: 1;
}

.hero-title {
  font-size: var(--font-size-5xl);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  letter-spacing: var(--letter-spacing-tight);
  margin-bottom: var(--space-6);
  color: var(--color-white-pure);
}

.hero-subtitle {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-normal);
  color: var(--color-gray-300);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-8);
}

.hero-actions {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  flex-wrap: wrap;
}

/* =================================
   FEATURE GRID
   ================================= */

/**
 * Feature Display Grid
 */

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-6);
  margin-top: var(--space-8);
}

.feature-card {
  padding: var(--space-6);
  border: var(--border-width-thin) solid var(--color-gray-200);
  border-radius: var(--border-radius-lg);
  background-color: var(--color-white-pure);
  transition: all var(--transition-base) var(--transition-timing);
}

.feature-card:hover {
  border-color: var(--color-purple-light);
  box-shadow: var(--shadow-purple-sm);
  transform: translateY(-8px);
}

/**
 * Large Feature Section - Revolut Style
 * Full-width with image and content side-by-side
 */

.feature-large {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
  align-items: center;
  min-height: 80vh;
}

.feature-large-content {
  padding: var(--space-8);
}

.feature-large-image {
  position: relative;
  height: 100%;
  min-height: 500px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.feature-large-image img {
  max-width: 100%;
  height: auto;
  border-radius: var(--border-radius-xl);
}

@media (max-width: 768px) {
  .feature-large {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }
  
  .feature-large-image {
    display: none;
  }
}

.feature-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-gray-900), var(--color-gray-700));
  color: var(--color-white-pure);
  border-radius: var(--border-radius-md);
  margin-bottom: var(--space-4);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
}

.feature-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-black-pure);
  margin-bottom: var(--space-3);
}

.feature-description {
  font-size: var(--font-size-base);
  color: var(--color-gray-600);
  line-height: var(--line-height-relaxed);
}

/* =================================
   BADGES & TAGS
   ================================= */

/**
 * Badge Component
 */

.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  letter-spacing: var(--letter-spacing-wide);
  text-transform: uppercase;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--border-radius-full);
  border: var(--border-width-thin) solid transparent;
}

.badge-purple {
  color: var(--color-purple-primary);
  background-color: rgba(139, 92, 246, 0.1);
  border-color: var(--color-purple-primary);
}

.badge-gray {
  color: var(--color-gray-700);
  background-color: var(--color-gray-100);
  border-color: var(--color-gray-200);
}

/* =================================
   FOOTER
   ================================= */

/**
 * Footer Component
 */

.footer {
  background-color: var(--color-black-rich);
  color: var(--color-gray-400);
  padding: var(--space-12) 0 var(--space-6);
  border-top: var(--border-width-thin) solid var(--color-gray-800);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-8);
  margin-bottom: var(--space-8);
}

.footer-section-title {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-white-pure);
  letter-spacing: var(--letter-spacing-wider);
  text-transform: uppercase;
  margin-bottom: var(--space-4);
}

.footer-links {
  list-style: none;
}

.footer-link {
  display: block;
  padding: var(--space-2) 0;
  font-size: var(--font-size-sm);
  color: var(--color-gray-400);
  transition: color var(--transition-base) var(--transition-timing);
}

.footer-link:hover {
  color: var(--color-gray-300);
}

.footer-bottom {
  padding-top: var(--space-6);
  border-top: var(--border-width-thin) solid var(--color-gray-800);
  text-align: center;
  font-size: var(--font-size-sm);
}

/* =================================
   RESPONSIVE DESIGN
   ================================= */

/**
 * Tablet Breakpoint
 */

@media (max-width: 768px) {
  html {
    font-size: 14px;
  }
  
  .hero-title {
    font-size: var(--font-size-3xl);
  }
  
  .navbar-menu {
    gap: var(--space-4);
  }
  
  .hero-actions {
    flex-direction: column;
  }
  
  .feature-grid {
    grid-template-columns: 1fr;
  }
  
  .grid-cols-2,
  .grid-cols-3,
  .grid-cols-4 {
    grid-template-columns: 1fr;
  }
}

/**
 * Mobile Breakpoint
 */

@media (max-width: 480px) {
  .navbar-container {
    padding-left: var(--space-4);
    padding-right: var(--space-4);
  }
  
  .btn-lg {
    padding: var(--space-3) var(--space-6);
    font-size: var(--font-size-base);
  }
  
  .section {
    padding-top: var(--space-8);
    padding-bottom: var(--space-8);
  }
}

/**
 * Dark Mode Support (Optional)
 * Uncomment to enable dark mode
 */

/*
@media (prefers-color-scheme: dark) {
  :root {
    --color-black-pure: #ffffff;
    --color-white-pure: #0a0a0a;
    --color-gray-700: #a3a3a3;
  }
  
  body {
    background-color: var(--color-black-rich);
    color: var(--color-white-pure);
  }
}
*/

/* =================================
   END OF THEME
   ================================= */