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

:root {
    /* Color Palette */
    --primary-color: #667eea;
    --primary-dark: #5a67d8;
    --secondary-color: #764ba2;
    --accent-color: #f093fb;
    --accent-secondary: #f5576c;

    /* Neutral Colors - Maximum contrast for readability */
    --text-primary: #0a0a0a;
    --text-secondary: #1a1a1a;
    --text-muted: #404040;
    --background-primary: #ffffff;
    --background-secondary: #f7fafc;
    --background-accent: #edf2f7;
    --border-color: #e2e8f0;

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-serif: 'Crimson Text', Georgia, serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    /* Shadows */
    --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);

    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-xl: 0.75rem;
    --radius-2xl: 1rem;

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    :root {
        --text-primary: #f7fafc;
        --text-secondary: #e2e8f0;
        --text-muted: #a0aec0;
        --background-primary: #1a202c;
        --background-secondary: #2d3748;
        --background-accent: #4a5568;
        --border-color: #4a5568;
    }
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--background-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

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

p {
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
}

.lead {
    font-size: var(--font-size-lg);
    font-weight: 400;
    color: var(--text-primary);
}

/* Links */
a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-base);
    font-weight: 500;
    border: 2px solid transparent;
    border-radius: var(--radius-lg);
    text-decoration: none;
    transition: all var(--transition-normal);
    cursor: pointer;
    min-height: 44px; /* Accessibility: minimum touch target */
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    color: white;
}

.btn-secondary {
    background: transparent;
    color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-secondary:hover {
    background: var(--primary-color);
    color: white;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: all var(--transition-normal);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.nav-logo .logo-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 600;
    font-size: var(--font-size-lg);
    color: var(--text-primary);
}

.logo-icon {
    width: 32px;
    height: 32px;
    color: var(--primary-color);
}

.nav-menu {
    display: flex;
    align-items: center;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--spacing-xl);
    margin: 0;
}

.nav-link {
    font-weight: 500;
    color: var(--text-secondary);
    transition: color var(--transition-fast);
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 6px;
    height: 6px;
    background: var(--primary-color);
    border-radius: 50%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: all var(--transition-fast);
}

/* Hero Section */
.hero-section {
    padding: 120px 0 var(--spacing-3xl);
    background: #ffffff;
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
}

/* Remove overlay for maximum text contrast */
.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: none;
    pointer-events: none;
    z-index: 1;
}

.hero-container {
    position: relative;
    z-index: 2;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.hero-content {
    max-width: 600px;
}

.hero-title {
    font-size: var(--font-size-5xl);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.title-highlight {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    color: var(--primary-color); /* Fallback for browsers that don't support text-fill */
    display: block;
}

/* Fallback for browsers that don't support background-clip: text */
@supports not (-webkit-background-clip: text) {
    .title-highlight {
        background: none;
        color: var(--primary-color);
    }
}

.title-subtitle {
    color: var(--text-primary);
    font-weight: 600;
    display: block;
    margin-top: var(--spacing-sm);
    font-size: var(--font-size-3xl);
}

.hero-description {
    font-size: var(--font-size-xl);
    color: var(--text-primary);
    margin-bottom: var(--spacing-xl);
    line-height: 1.8;
    font-weight: 400;
    opacity: 1;
}

.hero-actions {
    display: flex;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-animation {
    width: 100%;
    max-width: 600px;
    height: auto;
}

/* Network Animation Styles */
.network-node {
    filter: drop-shadow(0 4px 8px rgba(102, 126, 234, 0.3));
}

.dharma-wheel {
    filter: drop-shadow(0 4px 12px rgba(74, 85, 104, 0.4));
}

/* Section Styles */
.section-title {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.section-subtitle {
    text-align: center;
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-2xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Challenges Section */
.challenges-section {
    padding: var(--spacing-3xl) 0;
    background: var(--background-primary);
}

.challenges-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.challenge-card {
    background: var(--background-secondary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
    text-align: center;
}

.challenge-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.challenge-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--spacing-lg);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.challenge-icon svg {
    width: 30px;
    height: 30px;
}

.challenge-card h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.challenge-card p {
    margin-bottom: var(--spacing-lg);
}

.challenge-link {
    font-weight: 500;
    color: var(--primary-color);
    text-decoration: none;
    border-bottom: 2px solid transparent;
    transition: border-color var(--transition-fast);
}

.challenge-link:hover {
    border-bottom-color: var(--primary-color);
}

/* Suttas Section */
.suttas-section {
    padding: var(--spacing-3xl) 0;
    background: var(--background-secondary);
}

.suttas-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

.sutta-category {
    background: var(--background-primary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.category-title {
    color: var(--primary-color);
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.sutta-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.sutta-item {
    padding: var(--spacing-md);
    border-left: 4px solid var(--primary-color);
    background: var(--background-secondary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.sutta-item:hover {
    background: var(--background-accent);
    transform: translateX(4px);
}

.sutta-item h4 {
    margin-bottom: var(--spacing-sm);
}

.sutta-item h4 a {
    color: var(--text-primary);
    font-weight: 600;
}

.sutta-item h4 a:hover {
    color: var(--primary-color);
}

.sutta-item p {
    color: var(--text-muted);
    font-size: var(--font-size-sm);
    margin: 0;
}

.suttas-actions {
    text-align: center;
}

/* Search Section */
.search-section {
    padding: var(--spacing-3xl) 0;
    background: var(--background-primary);
}

.search-container {
    max-width: 800px;
    margin: 0 auto;
}

.search-input-wrapper {
    position: relative;
    margin-bottom: var(--spacing-lg);
}

#searchInput {
    width: 100%;
    padding: var(--spacing-lg) var(--spacing-xl);
    padding-right: 60px;
    font-size: var(--font-size-lg);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-xl);
    background: var(--background-secondary);
    transition: all var(--transition-fast);
}

#searchInput:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

#searchBtn {
    position: absolute;
    right: var(--spacing-sm);
    top: 50%;
    transform: translateY(-50%);
    background: var(--primary-color);
    color: white;
    border: none;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
}

#searchBtn:hover {
    background: var(--primary-dark);
    transform: translateY(-50%) scale(1.05);
}

#searchBtn svg {
    width: 20px;
    height: 20px;
}

.search-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
    justify-content: center;
}

.search-tag {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--background-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.search-tag:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.search-results {
    margin-top: var(--spacing-xl);
}

/* About Section */
.about-section {
    padding: var(--spacing-3xl) 0;
    background: var(--background-secondary);
}

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.about-text {
    font-family: var(--font-serif);
    font-size: var(--font-size-lg);
    line-height: 1.8;
}

.about-visual {
    display: flex;
    justify-content: center;
}

.about-diagram {
    width: 100%;
    max-width: 400px;
    height: auto;
}

.diagram-text {
    font-family: var(--font-primary);
    font-size: 12px;
    font-weight: 500;
    fill: white;
}

/* Footer */
.footer {
    background: var(--text-primary);
    color: var(--background-primary);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-section h3,
.footer-section h4 {
    color: var(--background-primary);
    margin-bottom: var(--spacing-md);
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: var(--spacing-sm);
}

.footer-section a {
    color: var(--text-muted);
    transition: color var(--transition-fast);
}

.footer-section a:hover {
    color: var(--background-primary);
}

.footer-bottom {
    border-top: 1px solid var(--text-secondary);
    padding-top: var(--spacing-lg);
    text-align: center;
    color: var(--text-muted);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--spacing-xl);
    }

    .about-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }

    .nav-toggle {
        display: flex;
    }

    .hero-title {
        font-size: var(--font-size-4xl);
    }

    .hero-actions {
        justify-content: center;
    }

    .challenges-grid {
        grid-template-columns: 1fr;
    }

    .suttas-grid {
        grid-template-columns: 1fr;
    }

    .container {
        padding: 0 var(--spacing-md);
    }

    .nav-container {
        padding: 0 var(--spacing-md);
    }
}

@media (max-width: 480px) {
    .hero-section {
        padding: 100px 0 var(--spacing-xl);
    }

    .hero-title {
        font-size: var(--font-size-3xl);
    }

    .hero-actions {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 280px;
    }

    .search-tags {
        justify-content: flex-start;
    }
}

/* Animation Classes */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.6s ease-out forwards;
}

.fade-in-delay {
    animation-delay: 0.2s;
}

@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Scroll animations */
.scroll-reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease-out;
}

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

/* Focus styles for accessibility */
*:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.btn:focus,
.nav-link:focus,
.search-tag:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --primary-color: #0066cc;
        --text-secondary: #000000;
        --border-color: #000000;
    }
}

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

    html {
        scroll-behavior: auto;
    }
}