:root {
    --color-primary: #5B5BD6;
    --color-primary-hover: #4A4AC5;
    --color-text: #1F2937;
    --color-text-light: #6B7280;
    --color-bg: #FFFFFF;
    --color-bg-gray: #F9FAFB;
    --color-border: #E5E7EB;
    --color-code-bg: #F3F4F6;
    --max-width: 1200px;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--color-text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Navigation */
.navbar {
    border-bottom: 1px solid var(--color-border);
    background: var(--color-bg);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.9);
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    font-size: 1.125rem;
    color: var(--color-text);
    text-decoration: none;
}

.logo svg {
    color: var(--color-primary);
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-links a {
    color: var(--color-text-light);
    text-decoration: none;
    font-size: 0.938rem;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--color-text);
}

.github-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: 0.5rem;
    transition: all 0.2s;
}

.github-link:hover {
    background: var(--color-bg-gray);
    border-color: var(--color-text-light);
}

/* Hero Section */
.hero {
    padding: var(--spacing-xl) 0 var(--spacing-lg);
    text-align: center;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--color-primary) 0%, #4A4AC5 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--color-text-light);
    max-width: 700px;
    margin: 0 auto;
}

/* Sections */
.section {
    padding: var(--spacing-xl) 0;
}

.section-gray {
    background: var(--color-bg-gray);
}

.section h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    text-align: center;
}

.section h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.section-intro {
    font-size: 1.125rem;
    color: var(--color-text-light);
    max-width: 800px;
    margin: 0 auto var(--spacing-md);
    line-height: 1.7;
    text-align: center;
}

/* Benefits Grid */
.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.benefit-card {
    padding: var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: 0.75rem;
    background: var(--color-bg);
}

.benefit-card h3 {
    margin-top: 0;
    margin-bottom: var(--spacing-sm);
    color: var(--color-primary);
}

.benefit-card p {
    color: var(--color-text-light);
    line-height: 1.7;
}

/* Feature List */
.feature-list {
    list-style: none;
    max-width: 800px;
}

.feature-list li {
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--color-border);
    font-size: 1.063rem;
    line-height: 1.7;
}

.feature-list li:last-child {
    border-bottom: none;
}

.feature-list strong {
    color: var(--color-text);
    font-weight: 600;
}

/* Code Blocks */
.code-block {
    background: var(--color-code-bg);
    border: 1px solid var(--color-border);
    border-radius: 0.75rem;
    overflow: hidden;
    margin: var(--spacing-md) 0;
}

.code-header {
    background: var(--color-bg);
    padding: 0.75rem 1.25rem;
    border-bottom: 1px solid var(--color-border);
    font-size: 0.875rem;
    color: var(--color-text-light);
    font-weight: 500;
}

.code-block pre {
    padding: 1.25rem;
    overflow-x: auto;
    margin: 0;
}

.code-block code {
    font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Courier New', monospace;
    font-size: 0.875rem;
    line-height: 1.7;
    color: var(--color-text);
}

code {
    background: var(--color-code-bg);
    padding: 0.125rem 0.375rem;
    border-radius: 0.25rem;
    font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Courier New', monospace;
    font-size: 0.875em;
    color: var(--color-primary);
}

/* Concept Grid */
.concept-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.concept-card {
    padding: var(--spacing-md);
    border-left: 3px solid var(--color-primary);
    background: var(--color-bg);
}

.concept-card h4 {
    font-size: 1.125rem;
    margin-bottom: 0.75rem;
    color: var(--color-text);
}

.concept-card p {
    color: var(--color-text-light);
    font-size: 0.938rem;
    line-height: 1.7;
}

/* Example Grid */
.example-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.example-card {
    padding: var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: 0.75rem;
    background: var(--color-bg);
    transition: all 0.2s;
}

.example-card:hover {
    border-color: var(--color-primary);
    box-shadow: 0 4px 12px rgba(91, 91, 214, 0.1);
}

.example-card h3 {
    margin-top: 0;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
    font-size: 1.25rem;
}

.example-card p {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-sm);
    line-height: 1.6;
}

.example-schedule {
    display: inline-block;
    background: var(--color-code-bg);
    padding: 0.375rem 0.75rem;
    border-radius: 0.375rem;
    font-size: 0.813rem;
    color: var(--color-primary);
}

/* Adoption Grid */
.adoption-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.adoption-card {
    padding: var(--spacing-md);
    border: 2px solid var(--color-border);
    border-radius: 0.75rem;
    background: var(--color-bg);
    text-align: center;
}

.adoption-card.coming-soon {
    border-style: dashed;
    opacity: 0.6;
}

.adoption-logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.adoption-card p {
    color: var(--color-text-light);
    font-size: 0.938rem;
}

/* CTA Section */
.section-cta {
    background: linear-gradient(135deg, var(--color-primary) 0%, #4A4AC5 100%);
    color: white;
}

.section-cta h2 {
    color: white;
}

.cta-text {
    font-size: 1.125rem;
    max-width: 700px;
    margin: 0 auto var(--spacing-md);
    text-align: center;
    opacity: 0.95;
}

.cta-text a {
    color: white;
    text-decoration: underline;
}

.cta-text a:hover {
    opacity: 0.8;
}

.cta-buttons {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
}

.button {
    display: inline-block;
    padding: 0.875rem 1.75rem;
    border-radius: 0.5rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.2s;
    font-size: 1rem;
}

.button-primary {
    background: white;
    color: var(--color-primary);
}

.button-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.button-secondary {
    background: transparent;
    color: white;
    border: 2px solid white;
}

.button-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* Get Started Grid */
.get-started-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.get-started-card {
    padding: var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: 0.75rem;
    background: var(--color-bg);
    text-decoration: none;
    color: inherit;
    transition: all 0.2s;
    position: relative;
}

.get-started-card:hover {
    border-color: var(--color-primary);
    box-shadow: 0 4px 12px rgba(91, 91, 214, 0.1);
    transform: translateY(-2px);
}

.get-started-card h3 {
    margin-top: 0;
    margin-bottom: 0.75rem;
    color: var(--color-primary);
    font-size: 1.25rem;
}

.get-started-card p {
    color: var(--color-text-light);
    margin-bottom: 0;
    line-height: 1.6;
}

.get-started-card .arrow {
    position: absolute;
    bottom: var(--spacing-md);
    right: var(--spacing-md);
    font-size: 1.5rem;
    color: var(--color-primary);
    opacity: 0;
    transition: opacity 0.2s;
}

.get-started-card:hover .arrow {
    opacity: 1;
}

/* Footer */
footer {
    background: var(--color-text);
    color: white;
    padding: var(--spacing-lg) 0 var(--spacing-md);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-left .logo {
    color: white;
    margin-bottom: var(--spacing-sm);
}

.footer-left p {
    color: rgba(255, 255, 255, 0.7);
    max-width: 300px;
}

.footer-links {
    display: flex;
    gap: var(--spacing-md);
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: color 0.2s;
}

.footer-links a:hover {
    color: white;
}

.footer-bottom {
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.875rem;
}

.footer-bottom a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
}

.footer-bottom a:hover {
    color: white;
}

/* Event Types Section */
.event-types {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    margin-top: 2rem;
}

@media (max-width: 1200px) {
    .event-types {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .event-types {
        grid-template-columns: 1fr;
    }
}

.event-type-card {
    background: white;
    border-radius: 12px;
    padding: 1.5rem;
    border: 1px solid var(--color-border);
    transition: all 0.2s ease;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.event-type-card:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    transform: translateY(-2px);
}

.event-type-card h3 {
    color: var(--color-primary);
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
    line-height: 1.3;
}

.event-type-card p {
    margin-bottom: 0.5rem;
    color: var(--color-text);
    font-size: 0.9rem;
    line-height: 1.5;
}

.event-type-card .event-use-case {
    margin-top: auto;
    padding-top: 0.5rem;
    border-top: 1px solid var(--color-border);
    font-size: 0.85rem;
}

.event-type-card strong {
    color: var(--color-text);
}

.event-type-card .code-block {
    margin: 1rem 0;
}

.event-type-card .code-block pre {
    margin: 0;
    font-size: 0.875rem;
}

.event-use-case {
    color: var(--color-text-light);
    font-size: 0.9rem;
    font-style: italic;
    margin-top: 1rem;
    margin-bottom: 0;
}

/* EventBus Vision Section */
.eventbus-vision {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.vision-card {
    background: white;
    border-radius: 12px;
    padding: 1.75rem;
    border: 1px solid var(--color-border);
    transition: all 0.3s ease;
}

.vision-card:hover {
    box-shadow: 0 8px 20px rgba(99, 102, 241, 0.15);
    transform: translateY(-4px);
    border-color: var(--color-primary);
}

.vision-card h3 {
    color: var(--color-primary);
    margin-bottom: 1rem;
    font-size: 1.25rem;
}

.vision-card p {
    color: var(--color-text);
    line-height: 1.7;
    margin: 0;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.25rem;
    }
    
    .section h2 {
        font-size: 2rem;
    }
    
    .nav-links {
        gap: 1rem;
    }
    
    .cta-buttons {
        flex-direction: column;
    }
    
    .button {
        width: 100%;
        text-align: center;
    }
}

/* Tagline Section */
.tagline-section {
    background: linear-gradient(135deg, rgba(91, 91, 214, 0.05), rgba(139, 92, 246, 0.05));
    padding: var(--spacing-lg) 0;
}

.tagline-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    max-width: 900px;
    margin: 0 auto;
}

.tagline-item {
    text-align: center;
    padding: var(--spacing-md);
}

.tagline-item p {
    font-size: 1.25rem;
    color: var(--color-text);
    line-height: 1.6;
    margin-top: var(--spacing-sm);
}

.tagline-highlight {
    display: inline-block;
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    position: relative;
    animation: fadeInScale 0.8s ease-out;
}

.tagline-highlight.what {
    color: #5B5BD6;
    text-shadow: 0 0 30px rgba(91, 91, 214, 0.3);
}

.tagline-highlight.when {
    color: #8B5CF6;
    text-shadow: 0 0 30px rgba(139, 92, 246, 0.3);
}

.tagline-highlight::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 60%;
    height: 4px;
    background: currentColor;
    border-radius: 2px;
    animation: expandWidth 0.8s ease-out 0.3s both;
}

@keyframes fadeInScale {
    0% {
        opacity: 0;
        transform: scale(0.8);
    }
    100% {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes expandWidth {
    0% {
        width: 0%;
    }
    100% {
        width: 60%;
    }
}

@media (max-width: 768px) {
    .tagline-highlight {
        font-size: 2.5rem;
    }
    
    .tagline-item p {
        font-size: 1.1rem;
    }
}

/* Ecosystem Integration Section */
.ecosystem-section {
    background: var(--color-bg);
}

.protocol-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.protocol-card {
    background: var(--color-bg-gray);
    padding: var(--spacing-md);
    border-radius: 12px;
    border: 2px solid var(--color-border);
    text-align: center;
    transition: all 0.3s ease;
}

.protocol-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
    box-shadow: 0 8px 16px rgba(91, 91, 214, 0.1);
}

.protocol-icon {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
    padding: 0.5rem 1rem;
    background: linear-gradient(135deg, rgba(91, 91, 214, 0.1), rgba(139, 92, 246, 0.1));
    border-radius: 8px;
    display: inline-block;
}

.protocol-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 0.5rem;
}

.protocol-card p {
    font-size: 0.95rem;
    color: var(--color-text-light);
    line-height: 1.5;
}

.synergy-box {
    background: linear-gradient(135deg, rgba(91, 91, 214, 0.05), rgba(139, 92, 246, 0.05));
    border: 2px solid var(--color-primary);
    border-radius: 12px;
    padding: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.synergy-box h3 {
    color: var(--color-primary);
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
    text-align: center;
}

.synergy-box > p {
    text-align: center;
}

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

.synergy-item {
    background: var(--color-bg);
    padding: var(--spacing-md);
    border-radius: 8px;
    border-left: 4px solid var(--color-primary);
    font-size: 1rem;
    line-height: 1.6;
}

.synergy-item strong {
    color: var(--color-primary);
    font-weight: 600;
}

.synergy-item em {
    color: var(--color-text);
    font-style: italic;
}

/* Protocol Synergy Highlight Section */
.synergy-highlight-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-md);
    max-width: 1200px;
    margin: 0 auto;
}

.synergy-highlight-item {
    text-align: center;
    padding: var(--spacing-md);
}

.synergy-highlight-item p {
    font-size: 1.125rem;
    color: var(--color-text);
    line-height: 1.6;
    margin-top: var(--spacing-sm);
}

.synergy-highlight-item em {
    font-style: italic;
    color: var(--color-text-light);
}

.synergy-keyword {
    display: inline-block;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    position: relative;
    animation: fadeInScale 0.8s ease-out;
}

.synergy-keyword.events {
    color: #5B5BD6;
    text-shadow: 0 0 30px rgba(91, 91, 214, 0.3);
}

.synergy-keyword.skills {
    color: #8B5CF6;
    text-shadow: 0 0 30px rgba(139, 92, 246, 0.3);
}

.synergy-keyword.mcp {
    color: #EC4899;
    text-shadow: 0 0 30px rgba(236, 72, 153, 0.3);
}

.synergy-keyword.a2a {
    color: #F59E0B;
    text-shadow: 0 0 30px rgba(245, 158, 11, 0.3);
}

.synergy-keyword::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 60%;
    height: 4px;
    background: currentColor;
    border-radius: 2px;
    animation: expandWidth 0.8s ease-out 0.3s both;
}

@media (max-width: 768px) {
    .protocol-grid {
        grid-template-columns: 1fr;
    }
    
    .synergy-grid {
        grid-template-columns: 1fr;
    }
    
    .synergy-highlight-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .synergy-keyword {
        font-size: 2rem;
    }
    
    .synergy-highlight-item p {
        font-size: 1rem;
    }
}