:root {
    /* Modern Color Palette */
    --primary-color: #1a202c;
    --secondary-color: #4a5568;
    --accent-color: #667eea;
    --accent-secondary: #764ba2;
    --background-color: #fafbfc;
    --text-color: #2d3748;
    --text-muted: #718096;
    --card-background: #ffffff;
    --surface-color: #f7fafc;
    
    /* Enhanced Spacing System */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Modern Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07), 0 2px 4px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1), 0 4px 6px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1), 0 10px 10px rgba(0, 0, 0, 0.04);
    
    /* Typography Scale */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    --text-5xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Other Design Tokens */
    --border-color: #e2e8f0;
    --header-text-color: #ffffff;
    --gradient-primary: linear-gradient(135deg, var(--accent-color), var(--accent-secondary));
    --gradient-surface: linear-gradient(145deg, #ffffff, #f8fafc);
}

[data-theme="dark"] {
    /* Dark Theme Modern Palette */
    --primary-color: #f7fafc;
    --secondary-color: #cbd5e0;
    --accent-color: #7c3aed;
    --accent-secondary: #a855f7;
    --background-color: #0f0f23;
    --text-color: #e2e8f0;
    --text-muted: #a0aec0;
    --card-background: #1a1a2e;
    --surface-color: #16213e;
    --border-color: #2d3748;
    --header-text-color: #0f0f23;
    --gradient-primary: linear-gradient(135deg, var(--accent-color), var(--accent-secondary));
    --gradient-surface: linear-gradient(145deg, #1a1a2e, #16213e);
    
    /* Darker shadows for dark theme */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3), 0 2px 4px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.3), 0 4px 6px rgba(0, 0, 0, 0.2);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.4), 0 10px 10px rgba(0, 0, 0, 0.3);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Enhanced animations */
@keyframes fadeIn {
    from { 
        opacity: 0; 
        transform: translateY(30px);
    }
    to { 
        opacity: 1; 
        transform: translateY(0);
    }
}

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

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.7;
    color: var(--text-color);
    background: var(--background-color);
    font-size: var(--text-base);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-behavior: smooth;
}

main {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-md);
    animation: fadeIn 1s cubic-bezier(0.4, 0, 0.2, 1);
}

header {
    text-align: center;
    padding: var(--spacing-3xl) var(--spacing-xl);
    background: var(--gradient-primary);
    color: var(--header-text-color);
    margin: calc(var(--spacing-md) * -1);
    margin-bottom: var(--spacing-2xl);
    position: relative;
    overflow: hidden;
    border-radius: 0 0 var(--radius-xl) var(--radius-xl);
    box-shadow: var(--shadow-lg);
}

header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, rgba(255, 255, 255, 0.1), transparent);
    z-index: 1;
}

header::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
    animation: float 6s ease-in-out infinite;
    z-index: 1;
}

h1 {
    font-size: var(--text-5xl);
    margin-bottom: var(--spacing-sm);
    font-weight: 800;
    letter-spacing: -0.025em;
    position: relative;
    z-index: 2;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.header-subtitle {
    font-size: var(--text-lg);
    font-weight: 400;
    opacity: 0.9;
    margin-bottom: var(--spacing-lg);
    position: relative;
    z-index: 2;
    letter-spacing: 0.025em;
}

h2 {
    color: var(--primary-color);
    margin: var(--spacing-2xl) 0 var(--spacing-lg);
    font-size: var(--text-3xl);
    font-weight: 700;
    letter-spacing: -0.025em;
    position: relative;
    display: inline-block;
}

h2::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 60px;
    height: 4px;
    background: var(--gradient-primary);
    border-radius: var(--radius-sm);
    transform: scaleX(0);
    transform-origin: left;
    animation: scaleIn 0.6s ease-out 0.3s forwards;
}

h3 {
    color: var(--secondary-color);
    margin-bottom: var(--spacing-sm);
    font-size: var(--text-xl);
    font-weight: 600;
    letter-spacing: -0.01em;
}

section {
    margin-bottom: var(--spacing-3xl);
    animation: fadeIn 0.8s cubic-bezier(0.4, 0, 0.2, 1) backwards;
}

section:nth-child(2) { animation-delay: 0.1s; }
section:nth-child(3) { animation-delay: 0.2s; }
section:nth-child(4) { animation-delay: 0.3s; }
section:nth-child(5) { animation-delay: 0.4s; }

.original-text {
    background: var(--gradient-surface);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.original-text::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.original-text:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.original-text:hover::before {
    transform: scaleX(1);
}

blockquote {
    border-left: 6px solid var(--accent-color);
    padding-left: var(--spacing-lg);
    font-style: italic;
    font-size: var(--text-lg);
    line-height: 1.8;
    color: var(--text-muted);
    position: relative;
    margin: var(--spacing-lg) 0;
}

blockquote::before {
    content: '"';
    font-size: var(--text-4xl);
    color: var(--accent-color);
    position: absolute;
    left: -10px;
    top: -10px;
    font-family: Georgia, serif;
    opacity: 0.3;
}

.principles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.principles-grid article {
    background: var(--gradient-surface);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    animation: scaleIn 0.6s cubic-bezier(0.4, 0, 0.2, 1) backwards;
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.principles-grid article::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.principles-grid article:hover {
    transform: translateY(-12px) scale(1.02);
    box-shadow: var(--shadow-xl);
}

.principles-grid article:hover::before {
    transform: scaleX(1);
}

.principles-grid article:nth-child(1) { animation-delay: 0.1s; }
.principles-grid article:nth-child(2) { animation-delay: 0.2s; }
.principles-grid article:nth-child(3) { animation-delay: 0.3s; }
.principles-grid article:nth-child(4) { animation-delay: 0.4s; }

.principles-grid article h3 {
    margin-bottom: var(--spacing-md);
    color: var(--primary-color);
    font-size: var(--text-xl);
}

.principles-grid article p {
    color: var(--text-muted);
    line-height: 1.8;
}

.key-practices {
    background: var(--gradient-surface);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    margin-top: calc(var(--spacing-3xl) / 2);
    margin-bottom: calc(var(--spacing-3xl) * 2);
}

.key-practices ul {
    list-style: none;
    padding: 0;
}

.key-practices li {
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md) var(--spacing-lg);
    padding-left: calc(var(--spacing-lg) + var(--spacing-xl));
    background: var(--card-background);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    animation: slideIn 0.6s cubic-bezier(0.4, 0, 0.2, 1) backwards;
    position: relative;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid var(--border-color);
}

.key-practices li::before {
    content: '✓';
    position: absolute;
    left: var(--spacing-lg);
    top: var(--spacing-md);
    color: var(--accent-color);
    font-weight: bold;
    font-size: var(--text-lg);
    width: var(--spacing-xl);
    height: var(--spacing-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 1.2;
}

.key-practices li:hover {
    transform: translateX(8px);
    box-shadow: var(--shadow-md);
    border-color: var(--accent-color);
}

.key-practices li:nth-child(1) { animation-delay: 0.1s; }
.key-practices li:nth-child(2) { animation-delay: 0.2s; }
.key-practices li:nth-child(3) { animation-delay: 0.3s; }
.key-practices li:nth-child(4) { animation-delay: 0.4s; }
.key-practices li:nth-child(5) { animation-delay: 0.5s; }
.key-practices li:nth-child(6) { animation-delay: 0.6s; }

.values-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    padding: var(--spacing-xl);
    background: var(--gradient-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

.values-list span {
    background: var(--gradient-primary);
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-xl);
    font-weight: 600;
    font-size: var(--text-sm);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    animation: scaleIn 0.5s cubic-bezier(0.4, 0, 0.2, 1) backwards;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    box-shadow: var(--shadow-sm);
}

.values-list span::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 0.5s ease;
}

.values-list span:hover {
    transform: translateY(-4px) scale(1.05);
    box-shadow: var(--shadow-lg);
}

.values-list span:hover::before {
    left: 100%;
}

.values-list span:nth-child(1) { animation-delay: 0.1s; }
.values-list span:nth-child(2) { animation-delay: 0.2s; }
.values-list span:nth-child(3) { animation-delay: 0.3s; }
.values-list span:nth-child(4) { animation-delay: 0.4s; }
.values-list span:nth-child(5) { animation-delay: 0.5s; }
.values-list span:nth-child(6) { animation-delay: 0.6s; }

footer {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--text-muted);
    border-top: 2px solid var(--border-color);
    margin-top: var(--spacing-3xl);
    font-size: var(--text-sm);
    background: var(--surface-color);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    position: relative;
}

footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--gradient-primary);
    border-radius: 0 0 var(--radius-sm) var(--radius-sm);
}

.theme-toggle {
    position: fixed;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: 1000;
}

#themeToggle {
    background: var(--card-background);
    border: 2px solid var(--border-color);
    cursor: pointer;
    padding: var(--spacing-md);
    border-radius: 50%;
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

#themeToggle:hover {
    transform: scale(1.1) rotate(15deg);
    box-shadow: var(--shadow-xl);
    border-color: var(--accent-color);
}

#themeToggle:focus {
    outline: none;
    box-shadow: var(--shadow-xl), 0 0 0 3px rgba(102, 126, 234, 0.3);
}

#themeToggle svg {
    width: 24px;
    height: 24px;
    color: var(--text-color);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.sun-icon {
    display: none;
}

[data-theme="dark"] .sun-icon {
    display: block;
}

[data-theme="dark"] .moon-icon {
    display: none;
}

/* Enhanced responsive design */
@media (max-width: 768px) {
    :root {
        --text-5xl: 2.5rem;
        --text-4xl: 2rem;
        --text-3xl: 1.75rem;
        --text-2xl: 1.375rem;
        --spacing-3xl: 2.5rem;
        --spacing-2xl: 2rem;
        --spacing-xl: 1.25rem;
    }

    main {
        padding: var(--spacing-sm);
    }

    header {
        padding: var(--spacing-2xl) var(--spacing-md);
        margin: calc(var(--spacing-sm) * -1);
        margin-bottom: var(--spacing-xl);
    }

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

    h2 {
        font-size: var(--text-2xl);
        margin: var(--spacing-xl) 0 var(--spacing-md);
    }

    .principles-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }

    .principles-grid article {
        padding: var(--spacing-lg);
    }

    .original-text {
        padding: var(--spacing-lg);
    }

    .key-practices {
        padding: var(--spacing-lg);
    }

    .key-practices li {
        padding: var(--spacing-md);
        padding-left: calc(var(--spacing-lg) + var(--spacing-md));
        margin-bottom: var(--spacing-md);
    }

    .key-practices li::before {
        left: var(--spacing-md);
        top: var(--spacing-md);
        font-size: var(--text-base);
        width: var(--spacing-lg);
        height: var(--spacing-lg);
    }

    .values-list {
        padding: var(--spacing-lg);
        gap: var(--spacing-sm);
    }

    .values-list span {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: var(--text-xs);
    }

    .theme-toggle {
        top: var(--spacing-sm);
        right: var(--spacing-sm);
    }

    #themeToggle {
        width: 48px;
        height: 48px;
        padding: var(--spacing-sm);
    }

    blockquote {
        font-size: var(--text-base);
        padding-left: var(--spacing-md);
        margin: var(--spacing-md) 0;
    }
}

/* Enhanced accessibility improvements */
@media (prefers-reduced-motion: reduce) {
    * {
        animation: none !important;
        transition: none !important;
    }
    
    .theme-toggle button:hover {
        transform: none !important;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --accent-color: #0052cc;
        --primary-color: #000000;
        --secondary-color: #2d2d2d;
        --border-color: #666666;
    }
    
    [data-theme="dark"] {
        --accent-color: #66b3ff;
        --primary-color: #ffffff;
        --secondary-color: #cccccc;
        --border-color: #999999;
    }
}

/* Focus indicators for better accessibility */
button:focus-visible,
a:focus-visible {
    outline: 3px solid var(--accent-color);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

/* Improved print styles */
@media print {
    .theme-toggle {
        display: none;
    }
    
    header {
        background: none !important;
        color: black !important;
        box-shadow: none !important;
    }
    
    .original-text,
    .principles-grid article,
    .key-practices,
    .values-list {
        box-shadow: none !important;
        border: 1px solid #ccc !important;
    }
}