/* AVP Protocol Website Styles */

/* ============================================
   CSS Variables
   ============================================ */
:root {
    /* Colors */
    --color-primary: #6366f1;
    --color-primary-dark: #4f46e5;
    --color-secondary: #10b981;
    --color-secondary-dark: #059669;

    --color-bg: #0f0f1a;
    --color-bg-light: #1a1a2e;
    --color-bg-card: #16162a;

    --color-text: #e2e8f0;
    --color-text-muted: #94a3b8;
    --color-text-dark: #1e1e2e;

    --color-border: #2d2d4a;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a855f7 100%);
    --gradient-secondary: linear-gradient(135deg, #10b981 0%, #059669 100%);
    --gradient-dark: linear-gradient(180deg, #0f0f1a 0%, #1a1a2e 100%);

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 2rem;
    --spacing-xl: 4rem;
    --spacing-2xl: 8rem;

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.3);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--color-secondary);
}

img {
    max-width: 100%;
    height: auto;
}

ul {
    list-style: none;
}

code {
    font-family: var(--font-mono);
    font-size: 0.9em;
    background: var(--color-bg-light);
    padding: 0.2em 0.4em;
    border-radius: var(--radius-sm);
}

/* ============================================
   Layout
   ============================================ */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.section {
    padding: var(--spacing-2xl) 0;
}

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

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

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

.section-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-muted);
    text-align: center;
    max-width: 600px;
    margin: 0 auto var(--spacing-xl);
}

.subsection-title {
    font-size: 1.5rem;
    text-align: center;
    margin: var(--spacing-xl) 0 var(--spacing-lg);
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

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

.btn-outline {
    background: transparent;
    color: var(--color-text);
    border-color: var(--color-border);
}

.btn-outline:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.btn-light {
    background: white;
    color: var(--color-primary-dark);
}

.btn-light:hover {
    background: var(--color-text);
    color: var(--color-primary-dark);
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

/* ============================================
   Navigation
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(15, 15, 26, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
}

.logo:hover {
    color: var(--color-text);
}

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

.nav-links a {
    color: var(--color-text-muted);
    font-weight: 500;
}

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

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

.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: all 0.3s ease;
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    padding: 140px 0 var(--spacing-2xl);
    background: var(--gradient-dark);
    overflow: hidden;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--spacing-lg);
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-xl);
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.hero-stats {
    display: flex;
    gap: var(--spacing-xl);
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-primary);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

/* Code Block */
.code-block {
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.code-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--color-bg-light);
    border-bottom: 1px solid var(--color-border);
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.dot.red { background: #ff5f56; }
.dot.yellow { background: #ffbd2e; }
.dot.green { background: #27ca40; }

.filename {
    margin-left: auto;
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

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

.code-block code {
    font-size: 0.9rem;
    line-height: 1.7;
    background: none;
    padding: 0;
}

.code-block .keyword { color: #c792ea; }
.code-block .string { color: #c3e88d; }
.code-block .comment { color: #546e7a; }

/* ============================================
   Problem Section
   ============================================ */
.problem-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.problem-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
}

.problem-icon {
    color: #ef4444;
    margin-bottom: var(--spacing-lg);
}

.problem-card h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-md);
}

.problem-card p {
    color: var(--color-text-muted);
}

/* ============================================
   Features Section
   ============================================ */
.features-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

.feature-card {
    background: var(--color-bg-light);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}

.feature-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
    color: white;
}

.gradient-bg {
    background: var(--gradient-primary);
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
}

.feature-card p {
    color: var(--color-text-muted);
}

/* ============================================
   Architecture Section
   ============================================ */
.architecture {
    max-width: 600px;
    margin: 0 auto var(--spacing-xl);
}

.arch-layer {
    text-align: center;
    margin-bottom: var(--spacing-md);
}

.arch-label {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-sm);
}

.arch-box {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    font-family: var(--font-mono);
}

.arch-box.highlight {
    border-color: var(--color-primary);
    background: rgba(99, 102, 241, 0.1);
}

.arch-box.small {
    padding: var(--spacing-md);
    font-size: 0.875rem;
}

.arch-arrow {
    text-align: center;
    color: var(--color-text-muted);
    padding: var(--spacing-sm) 0;
    font-size: 0.875rem;
}

.backend-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-sm);
}

.operations-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: var(--spacing-sm);
    max-width: 900px;
    margin: 0 auto;
}

.operation {
    text-align: center;
    padding: var(--spacing-md);
    background: var(--color-bg-card);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
}

.operation code {
    display: block;
    color: var(--color-primary);
    font-size: 0.75rem;
    margin-bottom: var(--spacing-xs);
}

.operation span {
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

/* ============================================
   Implementations Section
   ============================================ */
.impl-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
}

.impl-card {
    display: block;
    background: var(--color-bg-light);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    transition: all 0.2s ease;
}

.impl-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
    color: var(--color-text);
}

.impl-icon {
    margin-bottom: var(--spacing-md);
}

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

.impl-card p {
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
}

.impl-card code {
    display: block;
    font-size: 0.8rem;
}

.framework-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-md);
    max-width: 800px;
    margin: 0 auto;
}

.framework-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--color-bg-light);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md) var(--spacing-lg);
    transition: all 0.2s ease;
}

.framework-card:hover {
    border-color: var(--color-primary);
    color: var(--color-text);
}

.framework-name {
    font-weight: 600;
    color: var(--color-text);
}

.framework-status {
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
}

.framework-status.ready {
    background: rgba(16, 185, 129, 0.2);
    color: var(--color-secondary);
}

/* ============================================
   NexusClaw Section
   ============================================ */
.nexusclaw-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}

.badge {
    display: inline-block;
    background: rgba(255, 255, 255, 0.2);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-xl);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.nexusclaw-info h2 {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.nexusclaw-tagline {
    font-size: 1.5rem;
    opacity: 0.9;
    margin-bottom: var(--spacing-lg);
}

.nexusclaw-info > p {
    font-size: 1.125rem;
    opacity: 0.9;
    margin-bottom: var(--spacing-lg);
}

.nexusclaw-features {
    margin-bottom: var(--spacing-xl);
}

.nexusclaw-features li {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    font-size: 1.125rem;
}

.nexusclaw-visual {
    text-align: center;
}

.device-image {
    max-width: 300px;
    filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.5));
}

/* ============================================
   CTA Section
   ============================================ */
.cta-section {
    text-align: center;
    background: var(--color-bg-light);
}

.cta-section h2 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
}

.cta-section p {
    font-size: 1.25rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-xl);
}

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

/* ============================================
   Footer
   ============================================ */
.footer {
    background: var(--color-bg);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-xl) 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
    gap: var(--spacing-xl);
}

.footer-brand p {
    color: var(--color-text-muted);
    margin-top: var(--spacing-md);
    font-size: 0.875rem;
}

.copyright {
    margin-top: var(--spacing-lg);
}

.footer-links h4 {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
}

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

.footer-links a {
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

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

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 1024px) {
    .hero .container {
        grid-template-columns: 1fr;
    }

    .hero h1 {
        font-size: 2.5rem;
    }

    .hero-visual {
        display: none;
    }

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

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

    .impl-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .operations-grid {
        grid-template-columns: repeat(4, 1fr);
    }

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

    .nexusclaw-features {
        display: inline-block;
        text-align: left;
    }

    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

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

    .mobile-menu-btn {
        display: flex;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero-stats {
        flex-direction: column;
        gap: var(--spacing-lg);
    }

    .hero-buttons {
        flex-direction: column;
    }

    .impl-grid,
    .framework-grid {
        grid-template-columns: 1fr;
    }

    .operations-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .backend-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }

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

    .footer-brand {
        text-align: center;
    }
}