/* ===================================
   Liquid Interfaces Landing Page
   Modern, fluid design system
   =================================== */

/* CSS Variables */
:root {
    /* Colors */
    --color-bg: #0a0a0f;
    --color-bg-secondary: #12121a;
    --color-bg-tertiary: #1a1a25;
    --color-text: #e8e8ed;
    --color-text-muted: #8888a0;
    --color-text-dim: #5555670;
    
    --color-primary: #6366f1;
    --color-primary-light: #818cf8;
    --color-primary-dark: #4f46e5;
    
    --color-accent: #22d3ee;
    --color-accent-light: #67e8f9;
    
    --color-liquid: #06b6d4;
    --color-solid: #f43f5e;
    
    --color-success: #10b981;
    --color-warning: #f59e0b;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    --gradient-hero: linear-gradient(180deg, rgba(99, 102, 241, 0.1) 0%, transparent 50%);
    --gradient-card: linear-gradient(145deg, rgba(255,255,255,0.05) 0%, rgba(255,255,255,0.02) 100%);
    
    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    
    /* 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-4xl: 6rem;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.2);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.3);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.4);
    --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.3);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: inherit;
    text-decoration: none;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    display: block;
}

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

/* ===================================
   Navigation
   =================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--space-md) 0;
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255,255,255,0.05);
    transition: var(--transition-base);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-weight: 600;
    font-size: 1.125rem;
}

.logo-icon {
    font-size: 1.5rem;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
}

.nav-links a {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition-fast);
}

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

.nav-btn {
    background: var(--gradient-primary);
    padding: var(--space-sm) var(--space-lg) !important;
    border-radius: var(--radius-full);
    color: white !important;
}

.nav-btn:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-sm);
}

.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: var(--transition-fast);
}

/* ===================================
   Hero Section
   =================================== */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: var(--space-4xl) var(--space-xl);
    overflow: hidden;
}

.hero-background {
    position: absolute;
    inset: 0;
    overflow: hidden;
    z-index: 0;
}

.wave {
    position: absolute;
    width: 200%;
    height: 200%;
    opacity: 0.1;
    border-radius: 40%;
}

.wave-1 {
    background: var(--color-primary);
    top: -50%;
    left: -50%;
    animation: wave-rotate 25s linear infinite;
}

.wave-2 {
    background: var(--color-accent);
    top: -60%;
    left: -60%;
    animation: wave-rotate 30s linear infinite reverse;
}

.wave-3 {
    background: var(--color-primary-light);
    top: -55%;
    left: -55%;
    animation: wave-rotate 35s linear infinite;
}

@keyframes wave-rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 900px;
}

.hero-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 300;
    line-height: 1.3;
    margin-bottom: var(--space-xl);
}

.title-line {
    display: block;
}

.title-line.highlight {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 600;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-muted);
    max-width: 600px;
    margin: 0 auto var(--space-2xl);
}

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

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-xl);
    border-radius: var(--radius-full);
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition-base);
    cursor: pointer;
    border: none;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 60px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
    background: rgba(255,255,255,0.1);
    color: var(--color-text);
    border: 1px solid rgba(255,255,255,0.1);
}

.btn-secondary:hover {
    background: rgba(255,255,255,0.15);
    border-color: rgba(255,255,255,0.2);
}

.btn .icon {
    width: 18px;
    height: 18px;
}

.scroll-indicator {
    position: absolute;
    bottom: var(--space-2xl);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    color: var(--color-text-muted);
    font-size: 0.8rem;
    animation: bounce 2s infinite;
}

.scroll-arrow {
    width: 20px;
    height: 20px;
    border-right: 2px solid var(--color-text-muted);
    border-bottom: 2px solid var(--color-text-muted);
    transform: rotate(45deg);
}

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

/* ===================================
   Section Styles
   =================================== */
.section {
    padding: var(--space-4xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-3xl);
}

.section-label {
    display: inline-block;
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-primary-light);
    margin-bottom: var(--space-md);
}

.section-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 600;
    line-height: 1.2;
}

/* ===================================
   Crisis Section
   =================================== */
.crisis-section {
    background: var(--color-bg-secondary);
}

.crisis-content {
    max-width: 800px;
    margin: 0 auto;
}

.lead-text {
    font-size: 1.25rem;
    color: var(--color-text);
    margin-bottom: var(--space-lg);
}

.crisis-content > p {
    color: var(--color-text-muted);
    margin-bottom: var(--space-xl);
}

.comparison-table {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: var(--space-xl);
    margin: var(--space-2xl) 0;
    align-items: start;
}

.comparison-column {
    background: var(--gradient-card);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
}

.comparison-column h3 {
    font-size: 1.1rem;
    margin-bottom: var(--space-lg);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.comparison-column .tag {
    font-size: 0.7rem;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-full);
    font-weight: 600;
    text-transform: uppercase;
}

.comparison-column.liquid .tag {
    background: rgba(6, 182, 212, 0.2);
    color: var(--color-liquid);
}

.comparison-column.solid .tag {
    background: rgba(244, 63, 94, 0.2);
    color: var(--color-solid);
}

.comparison-column ul {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.comparison-column li {
    color: var(--color-text-muted);
    padding-left: var(--space-lg);
    position: relative;
}

.comparison-column li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--color-text-dim);
}

.comparison-divider {
    display: flex;
    align-items: center;
    justify-content: center;
}

.vs {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-text-muted);
    background: var(--color-bg);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-full);
}

.conclusion {
    font-size: 1.1rem;
    color: var(--color-text);
    font-style: italic;
    text-align: center;
    padding-top: var(--space-xl);
    border-top: 1px solid rgba(255,255,255,0.1);
}

/* ===================================
   Manifesto Section
   =================================== */
.manifesto-section {
    background: var(--gradient-hero);
}

.manifesto-preamble {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}

.manifesto-preamble blockquote {
    font-size: 1.75rem;
    font-weight: 300;
    margin-bottom: var(--space-xl);
    position: relative;
    padding: var(--space-xl) 0;
}

.manifesto-preamble blockquote::before,
.manifesto-preamble blockquote::after {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 2px;
    background: var(--gradient-primary);
}

.manifesto-preamble blockquote::before { top: 0; }
.manifesto-preamble blockquote::after { bottom: 0; }

.manifesto-preamble blockquote p {
    margin-bottom: var(--space-sm);
}

.manifesto-preamble > p {
    color: var(--color-text-muted);
    font-size: 1.1rem;
    margin-bottom: var(--space-lg);
}

/* ===================================
   Principles Section
   =================================== */
.principles-section {
    background: var(--color-bg);
}

.principles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--space-xl);
}

.principle-card {
    background: var(--gradient-card);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.principle-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-primary);
    opacity: 0;
    transition: var(--transition-base);
}

.principle-card:hover {
    border-color: rgba(99, 102, 241, 0.3);
    transform: translateY(-4px);
}

.principle-card:hover::before {
    opacity: 1;
}

.principle-card.featured {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(34, 211, 238, 0.05) 100%);
    border-color: rgba(99, 102, 241, 0.2);
}

.principle-card.featured::before {
    opacity: 1;
}

.principle-number {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--color-primary-light);
    margin-bottom: var(--space-md);
}

.principle-card h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: var(--space-md);
}

.principle-card p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    margin-bottom: var(--space-lg);
}

.principle-tagline {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-accent);
    font-style: italic;
}

/* ===================================
   Theory Section
   =================================== */
.theory-section {
    background: var(--color-bg-secondary);
}

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

.theory-card {
    background: var(--gradient-card);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    text-align: center;
    transition: var(--transition-base);
}

.theory-card:hover {
    border-color: rgba(255,255,255,0.15);
    transform: translateY(-4px);
}

.theory-icon {
    font-size: 2.5rem;
    margin-bottom: var(--space-lg);
}

.theory-card h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.theory-author {
    font-size: 0.85rem;
    color: var(--color-primary-light);
    font-weight: 500;
    margin-bottom: var(--space-lg);
}

.theory-card > p:last-child {
    color: var(--color-text-muted);
    font-size: 0.95rem;
}

/* ===================================
   Formal Section
   =================================== */
.formal-section {
    background: var(--color-bg);
}

.formal-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--space-xl);
}

.formal-card {
    background: var(--gradient-card);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
}

.formal-card h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: var(--space-xs);
}

.paradigm-subtitle {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-lg);
}

.formula {
    background: var(--color-bg);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius-md);
    padding: var(--space-md) var(--space-lg);
    margin: var(--space-lg) 0;
    font-family: var(--font-mono);
    font-size: 0.95rem;
    color: var(--color-accent);
    overflow-x: auto;
}

.formula.error {
    color: var(--color-solid);
    border-color: rgba(244, 63, 94, 0.3);
}

.formal-card > p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
}

.formula-legend {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    margin: var(--space-lg) 0;
}

.formula-legend li {
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.formula-legend strong {
    font-family: var(--font-mono);
    color: var(--color-accent);
}

.lifecycle {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    flex-wrap: wrap;
    margin-top: var(--space-xl);
    padding-top: var(--space-lg);
    border-top: 1px solid rgba(255,255,255,0.1);
}

.lifecycle-step {
    font-size: 0.8rem;
    font-weight: 500;
    padding: var(--space-sm) var(--space-md);
    background: rgba(99, 102, 241, 0.15);
    border-radius: var(--radius-full);
    color: var(--color-primary-light);
}

.lifecycle-arrow {
    color: var(--color-text-dim);
}

.solid-paradigm {
    border-color: rgba(244, 63, 94, 0.2);
}

.liquid-paradigm {
    border-color: rgba(6, 182, 212, 0.2);
}

/* ===================================
   Protocol Architecture Section
   =================================== */

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

.protocol-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-2xl);
    align-items: start;
}

.protocol-stack {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.stack-layer {
    display: flex;
    flex-direction: column;
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255,255,255,0.1);
    transition: var(--transition-base);
}

.stack-layer:hover {
    transform: translateX(8px);
    border-color: rgba(99, 102, 241, 0.4);
}

.layer-name {
    font-weight: 600;
    font-size: 0.95rem;
    margin-bottom: var(--space-xs);
}

.layer-desc {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.layer-1 {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.2) 0%, rgba(99, 102, 241, 0.05) 100%);
    border-color: rgba(99, 102, 241, 0.3);
}

.layer-2 {
    background: linear-gradient(135deg, rgba(34, 211, 238, 0.2) 0%, rgba(34, 211, 238, 0.05) 100%);
    border-color: rgba(34, 211, 238, 0.3);
}

.layer-3 {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.15) 0%, rgba(16, 185, 129, 0.05) 100%);
    border-color: rgba(16, 185, 129, 0.25);
}

.layer-4 {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.15) 0%, rgba(245, 158, 11, 0.05) 100%);
    border-color: rgba(245, 158, 11, 0.25);
}

.layer-5 {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.15) 0%, rgba(139, 92, 246, 0.05) 100%);
    border-color: rgba(139, 92, 246, 0.25);
}

.message-types h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: var(--space-lg);
}

.message-grid {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.message-type {
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
    padding: var(--space-md);
    background: var(--gradient-card);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: var(--radius-md);
    transition: var(--transition-base);
}

.message-type:hover {
    border-color: rgba(34, 211, 238, 0.3);
    background: rgba(34, 211, 238, 0.05);
}

.message-type code {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-accent);
    background: rgba(34, 211, 238, 0.1);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    white-space: nowrap;
    min-width: 110px;
}

.message-type span {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    line-height: 1.5;
}

@media (max-width: 900px) {
    .protocol-content {
        grid-template-columns: 1fr;
    }
}

/* ===================================
   Differentiation Table Section
   =================================== */

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

.diff-table {
    display: flex;
    flex-direction: column;
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.diff-row {
    display: grid;
    grid-template-columns: 200px 1fr 1fr;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}

.diff-row:last-child {
    border-bottom: none;
}

.diff-header {
    background: var(--color-bg-tertiary);
}

.diff-header .diff-cell {
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
}

.diff-cell {
    padding: var(--space-md) var(--space-lg);
    font-size: 0.9rem;
    line-height: 1.5;
    border-right: 1px solid rgba(255,255,255,0.08);
}

.diff-cell:last-child {
    border-right: none;
}

.diff-label {
    font-weight: 600;
    color: var(--color-primary-light);
    background: rgba(99, 102, 241, 0.05);
}

.diff-cell.highlight {
    color: var(--color-accent-light);
    background: rgba(34, 211, 238, 0.05);
}

.diff-row:hover:not(.diff-header) {
    background: rgba(255,255,255,0.02);
}

@media (max-width: 900px) {
    .diff-row {
        grid-template-columns: 1fr;
    }
    
    .diff-header {
        display: none;
    }
    
    .diff-cell {
        border-right: none;
        border-bottom: 1px solid rgba(255,255,255,0.05);
    }
    
    .diff-cell:last-child {
        border-bottom: none;
    }
    
    .diff-label {
        font-size: 0.8rem;
        padding: var(--space-sm) var(--space-md);
    }
}

/* ===================================
   MCP Comparison Section
   =================================== */
.mcp-section {
    background: linear-gradient(180deg, var(--color-bg-secondary) 0%, var(--color-bg) 100%);
}

.mcp-comparison .lead-text {
    font-size: 1.25rem;
    text-align: center;
    max-width: 800px;
    margin: 0 auto var(--space-3xl);
    color: var(--color-text);
    line-height: 1.7;
}

.mcp-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-xl);
    margin-bottom: var(--space-3xl);
}

.mcp-card {
    background: var(--gradient-card);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    border: 1px solid rgba(255,255,255,0.1);
    transition: var(--transition-base);
}

.mcp-card:hover {
    transform: translateY(-4px);
    border-color: rgba(255,255,255,0.2);
}

.mcp-card.mcp-protocol {
    border-top: 3px solid #f59e0b;
}

.mcp-card.lip-protocol {
    border-top: 3px solid var(--color-accent);
}

.mcp-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
}

.mcp-icon {
    font-size: 1.5rem;
}

.mcp-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text);
    margin: 0;
}

.mcp-question {
    font-size: 1.1rem;
    font-style: italic;
    color: var(--color-text-muted);
    margin-bottom: var(--space-lg);
    padding: var(--space-md);
    background: rgba(255,255,255,0.03);
    border-radius: var(--radius-md);
    border-left: 3px solid var(--color-primary);
}

.mcp-protocol .mcp-question {
    border-left-color: #f59e0b;
}

.lip-protocol .mcp-question {
    border-left-color: var(--color-accent);
}

.mcp-features {
    list-style: none;
    padding: 0;
    margin: 0 0 var(--space-lg) 0;
}

.mcp-features li {
    padding: var(--space-sm) 0;
    font-size: 0.95rem;
    color: var(--color-text-muted);
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.mcp-features li:last-child {
    border-bottom: none;
}

.mcp-features li strong {
    color: var(--color-text);
    margin-right: var(--space-sm);
}

.mcp-analogy {
    font-size: 0.9rem;
    padding: var(--space-md);
    background: rgba(99, 102, 241, 0.1);
    border-radius: var(--radius-md);
    color: var(--color-text-muted);
}

.mcp-analogy span {
    font-weight: 600;
    color: var(--color-primary-light);
    margin-right: var(--space-sm);
}

.mcp-together {
    background: var(--gradient-card);
    border: 1px solid rgba(34, 211, 238, 0.2);
    border-radius: var(--radius-lg);
    padding: var(--space-2xl);
    text-align: center;
}

.mcp-together h3 {
    font-size: 1.5rem;
    margin-bottom: var(--space-lg);
    color: var(--color-text);
}

.mcp-together > p {
    font-size: 1.1rem;
    color: var(--color-text-muted);
    max-width: 700px;
    margin: 0 auto var(--space-xl);
    line-height: 1.7;
}

.mcp-stack-diagram {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    margin: var(--space-xl) auto;
    max-width: 500px;
}

.stack-item {
    width: 100%;
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-md);
    text-align: center;
}

.stack-item strong {
    display: block;
    font-size: 0.9rem;
    margin-bottom: var(--space-xs);
}

.stack-item span {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.stack-item.lip-layer {
    background: linear-gradient(135deg, rgba(34, 211, 238, 0.2) 0%, rgba(99, 102, 241, 0.2) 100%);
    border: 1px solid var(--color-accent);
}

.stack-item.lip-layer strong {
    color: var(--color-accent);
}

.stack-item.mcp-layer {
    background: rgba(245, 158, 11, 0.15);
    border: 1px solid #f59e0b;
}

.stack-item.mcp-layer strong {
    color: #f59e0b;
}

.stack-item.transport-layer {
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.2);
}

.stack-item.transport-layer strong {
    color: var(--color-text-muted);
}

.stack-arrow {
    color: var(--color-text-muted);
    font-size: 1.2rem;
}

.mcp-conclusion {
    font-size: 1rem;
    color: var(--color-text);
    margin-top: var(--space-lg);
}

@media (max-width: 768px) {
    .mcp-grid {
        grid-template-columns: 1fr;
    }
    
    .mcp-comparison .lead-text {
        font-size: 1.1rem;
    }
    
    .mcp-together {
        padding: var(--space-lg);
    }
}

/* ===================================
   Specs Section
   =================================== */
.specs-section {
    background: var(--color-bg-secondary);
}

.specs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--space-xl);
}

.spec-card {
    display: block;
    background: var(--gradient-card);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    transition: var(--transition-base);
}

.spec-card:hover {
    border-color: rgba(99, 102, 241, 0.3);
    transform: translateY(-4px);
}

.spec-card.featured-spec {
    border-color: rgba(34, 211, 238, 0.3);
    background: linear-gradient(135deg, rgba(34, 211, 238, 0.1) 0%, rgba(99, 102, 241, 0.05) 100%);
}

.spec-card.featured-spec:hover {
    border-color: rgba(34, 211, 238, 0.5);
    box-shadow: 0 0 30px rgba(34, 211, 238, 0.15);
}

.spec-icon {
    font-size: 2rem;
    margin-bottom: var(--space-lg);
}

.spec-card h3 {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: var(--space-md);
}

.spec-card p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    margin-bottom: var(--space-lg);
}

.spec-link {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-primary-light);
    transition: var(--transition-fast);
}

.spec-card:hover .spec-link {
    color: var(--color-accent);
}

/* ===================================
   Implementations Section
   =================================== */
.implementations-section {
    background: var(--color-bg);
}

.implementations-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--space-xl);
}

.impl-card {
    display: block;
    background: var(--gradient-card);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    transition: var(--transition-base);
}

.impl-card:hover {
    border-color: rgba(99, 102, 241, 0.3);
    transform: translateY(-4px);
}

.impl-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
}

.impl-status {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-full);
}

.impl-status.active {
    background: rgba(16, 185, 129, 0.2);
    color: var(--color-success);
}

.impl-header h3 {
    font-size: 1.2rem;
    font-weight: 600;
}

.impl-card > p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    margin-bottom: var(--space-lg);
}

.impl-features {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.impl-features span {
    font-size: 0.75rem;
    font-weight: 500;
    padding: var(--space-xs) var(--space-sm);
    background: rgba(99, 102, 241, 0.15);
    color: var(--color-primary-light);
    border-radius: var(--radius-full);
}

/* ===================================
   Section Subtitle
   =================================== */
.section-subtitle {
    font-size: 1.15rem;
    color: var(--color-text-muted);
    margin-top: var(--space-sm);
}

/* ===================================
   Nav Paper Link
   =================================== */
.nav-link-paper {
    color: var(--color-accent) !important;
}

/* ===================================
   Lifecycle Flow (How It Works)
   =================================== */
.lifecycle-flow {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    gap: var(--space-md);
    margin-top: var(--space-3xl);
    flex-wrap: wrap;
}

.lifecycle-step-card {
    background: var(--gradient-card);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    text-align: center;
    flex: 1;
    min-width: 140px;
    max-width: 200px;
    transition: var(--transition-base);
}

.lifecycle-step-card:hover {
    border-color: rgba(99, 102, 241, 0.4);
    transform: translateY(-4px);
}

.step-number {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary-light);
    margin-bottom: var(--space-sm);
}

.lifecycle-step-card h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.lifecycle-step-card p {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    line-height: 1.4;
}

.lifecycle-arrow-h {
    color: var(--color-text-muted);
    font-size: 1.5rem;
    margin-top: 2.5rem;
    flex-shrink: 0;
}

@media (max-width: 900px) {
    .lifecycle-flow {
        flex-direction: column;
        align-items: center;
    }
    
    .lifecycle-step-card {
        max-width: 300px;
        width: 100%;
    }
    
    .lifecycle-arrow-h {
        transform: rotate(90deg);
        margin-top: 0;
    }
}

/* ===================================
   Agentic Bus Section
   =================================== */
.agentic-bus-section {
    background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-secondary) 100%);
}

.bus-architecture {
    margin-bottom: var(--space-3xl);
}

.bus-arch-diagram {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-lg);
    flex-wrap: wrap;
}

.arch-node {
    background: var(--gradient-card);
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    text-align: center;
    min-width: 180px;
    max-width: 320px;
    flex: 1;
    transition: var(--transition-base);
}

.arch-node:hover {
    border-color: rgba(99, 102, 241, 0.4);
    transform: translateY(-2px);
}

.coordinator-node {
    border-color: rgba(34, 211, 238, 0.3);
    background: linear-gradient(135deg, rgba(34, 211, 238, 0.1) 0%, rgba(99, 102, 241, 0.05) 100%);
    flex: 1.5;
}

.dashboard-node {
    border-color: rgba(99, 102, 241, 0.3);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.05) 100%);
    flex: 1.2;
}

.api-node {
    border-color: rgba(16, 185, 129, 0.3);
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1) 0%, rgba(34, 211, 238, 0.05) 100%);
    flex: 1.2;
}

.api-node .arch-sub-nodes span {
    background: rgba(16, 185, 129, 0.15);
    color: var(--color-success);
}

.dashboard-node .arch-sub-nodes span {
    background: rgba(99, 102, 241, 0.15);
    color: var(--color-primary-light);
}

.bus-arch-bottom {
    margin-top: var(--space-lg);
    justify-content: center;
}

.arch-label {
    display: block;
    font-weight: 600;
    font-size: 1.1rem;
    margin-bottom: var(--space-xs);
}

.arch-desc {
    display: block;
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-md);
}

.arch-sub-nodes {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    justify-content: center;
}

.arch-sub-nodes span {
    font-size: 0.7rem;
    font-weight: 500;
    padding: var(--space-xs) var(--space-sm);
    background: rgba(34, 211, 238, 0.15);
    color: var(--color-accent);
    border-radius: var(--radius-full);
}

.arch-arrow {
    font-size: 1.5rem;
    color: var(--color-text-muted);
    flex-shrink: 0;
}

@media (max-width: 768px) {
    .bus-arch-diagram {
        flex-direction: column;
    }
    
    .arch-node {
        width: 100%;
        max-width: 100%;
    }
    
    .arch-arrow {
        transform: rotate(90deg);
    }
    
    .bus-arch-bottom {
        margin-top: var(--space-md);
    }
}

/* Code Blocks */
.code-block {
    background: #0d0d14;
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin-bottom: var(--space-xl);
}

.code-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-sm) var(--space-lg);
    background: rgba(255,255,255,0.03);
    border-bottom: 1px solid rgba(255,255,255,0.08);
}

.code-lang {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.code-block pre {
    padding: var(--space-lg);
    overflow-x: auto;
    margin: 0;
}

.code-block code {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.7;
    color: var(--color-text);
}

.code-comment {
    color: var(--color-text-muted);
}

/* Bus Quick Start */
.bus-quickstart {
    max-width: 700px;
    margin: 0 auto var(--space-3xl);
}

.bus-quickstart h3,
.bus-cli h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: var(--space-lg);
    text-align: center;
}

/* Bus Features Grid */
.bus-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-xl);
    margin-bottom: var(--space-3xl);
}

.bus-feature-card {
    background: var(--gradient-card);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    transition: var(--transition-base);
}

.bus-feature-card:hover {
    border-color: rgba(99, 102, 241, 0.3);
    transform: translateY(-4px);
}

.bus-feature-icon {
    font-size: 1.75rem;
    margin-bottom: var(--space-md);
}

.bus-feature-card h4 {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.bus-feature-card p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    line-height: 1.5;
}

/* Bus CLI */
.bus-cli {
    max-width: 700px;
    margin: 0 auto;
}

/* ===================================
   CTA Section
   =================================== */
.cta-section {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(34, 211, 238, 0.05) 100%);
    border-top: 1px solid rgba(99, 102, 241, 0.2);
    border-bottom: 1px solid rgba(99, 102, 241, 0.2);
}

.cta-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.cta-content h2 {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: var(--space-md);
}

.cta-content p {
    color: var(--color-text-muted);
    font-size: 1.1rem;
    margin-bottom: var(--space-xl);
}

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

/* ===================================
   Footer
   =================================== */
.footer {
    background: var(--color-bg-tertiary);
    padding: var(--space-4xl) 0 var(--space-xl);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr repeat(3, 1fr);
    gap: var(--space-2xl);
    margin-bottom: var(--space-2xl);
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.footer-brand .logo-icon {
    font-size: 2rem;
}

.footer-brand .logo-text {
    font-size: 1.25rem;
    font-weight: 600;
}

.footer-brand p {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    max-width: 250px;
}

.footer-column h4 {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: var(--space-lg);
    color: var(--color-text);
}

.footer-column a {
    display: block;
    color: var(--color-text-muted);
    font-size: 0.9rem;
    margin-bottom: var(--space-sm);
    transition: var(--transition-fast);
}

.footer-column a:hover {
    color: var(--color-text);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--space-xl);
    border-top: 1px solid rgba(255,255,255,0.1);
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.footer-bottom a {
    color: var(--color-primary-light);
}

.footer-bottom a:hover {
    text-decoration: underline;
}

/* ===================================
   Responsive Styles
   =================================== */
@media (max-width: 1024px) {
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-brand {
        grid-column: 1 / -1;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--color-bg-secondary);
        flex-direction: column;
        padding: var(--space-xl);
        gap: var(--space-lg);
        border-bottom: 1px solid rgba(255,255,255,0.1);
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .hero-title {
        font-size: 1.75rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .comparison-table {
        grid-template-columns: 1fr;
    }
    
    .comparison-divider {
        padding: var(--space-md) 0;
    }
    
    .formal-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: var(--space-sm);
        text-align: center;
    }
    
    .principles-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--space-md);
    }
    
    .hero {
        padding: var(--space-3xl) var(--space-md);
    }
    
    .hero-cta {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .section {
        padding: var(--space-3xl) 0;
    }
}

/* ===================================
   Animations
   =================================== */
@keyframes fade-in-up {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fade-in-up 0.6s ease forwards;
}

/* Scroll animations */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.animated {
    opacity: 1;
    transform: translateY(0);
}