/* ============================================
   WebhookHub AI - Liquid Glass Design System
   ============================================ */

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

:root {
    /* Colors - Blue-Purple Gradient Theme */
    --color-bg-primary: #0a0a0f;
    --color-bg-secondary: #141420;
    --color-gradient-start: #3b82f6; /* Blue */
    --color-gradient-end: #8b5cf6; /* Purple */
    --color-accent: #06b6d4; /* Cyan */
    --color-text-primary: #ffffff;
    --color-text-secondary: #94a3b8;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    
    /* Glass Effect */
    --glass-bg: rgba(30, 41, 59, 0.4);
    --glass-border: rgba(148, 163, 184, 0.1);
    --glass-blur: 20px;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* Border Radius - Only 2 values allowed */
    --radius-default: 16px; /* rounded-2xl */
    --radius-full: 9999px; /* rounded-full */
    
    /* Animation */
    --transition-fast: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Glass Morphism Base */
.glass {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur)) saturate(150%) brightness(110%);
    -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(150%) brightness(110%);
    border: 1px solid var(--glass-border);
}

/* Fallback for browsers without backdrop-filter support */
@supports not (backdrop-filter: blur(20px)) {
    .glass {
        background: rgba(30, 41, 59, 0.95);
    }
}

/* === Navigation === */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--spacing-sm) 0;
    transition: all var(--transition-base);
}

.nav.scrolled {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur)) saturate(150%) brightness(110%);
    -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(150%) brightness(110%);
    border-bottom: 1px solid var(--glass-border);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.nav-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.nav-logo {
    width: 32px;
    height: 32px;
    color: var(--color-gradient-start);
}

.nav-title {
    font-size: 1.25rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
    align-items: center;
}

.nav-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-fast);
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--color-gradient-start), var(--color-gradient-end));
    transition: width var(--transition-base);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-link-cta {
    padding: 0.5rem 1.25rem;
    background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
    border-radius: var(--radius-full);
    color: var(--color-text-primary);
}

.nav-link-cta::after {
    display: none;
}

.nav-link-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(59, 130, 246, 0.4);
}

/* === Hero Section === */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-2xl) var(--spacing-md);
    overflow: hidden;
}

.hero-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

.hero-content {
    position: relative;
    z-index: 10;
    max-width: 1100px;
    text-align: center;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
}

.gradient-text {
    background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(1.1rem, 2vw, 1.4rem);
    color: var(--color-text-secondary);
    max-width: 700px;
    margin: 0 auto var(--spacing-xl);
    line-height: 1.8;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-xl);
}

.hero-stats {
    display: flex;
    gap: var(--spacing-xl);
    justify-content: center;
    flex-wrap: wrap;
    margin-top: var(--spacing-2xl);
}

.stat {
    text-align: center;
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--color-gradient-start), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    margin-top: var(--spacing-xs);
}

/* === Buttons === */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
    cursor: pointer;
    border: none;
    min-width: 140px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
    color: var(--color-text-primary);
    box-shadow: 0 4px 14px rgba(59, 130, 246, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(59, 130, 246, 0.5);
}

.btn-secondary {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur)) saturate(150%) brightness(110%);
    -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(150%) brightness(110%);
    border: 1px solid var(--glass-border);
    color: var(--color-text-primary);
}

.btn-secondary:hover {
    transform: translateY(-2px);
    border-color: var(--color-gradient-start);
    box-shadow: 0 8px 25px rgba(59, 130, 246, 0.2);
}

.btn-large {
    padding: 1.125rem 2.5rem;
    font-size: 1.125rem;
}

/* === Sections === */
section {
    padding: var(--spacing-2xl) var(--spacing-md);
}

.container {
    max-width: 1280px;
    margin: 0 auto;
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    text-align: center;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--color-text-primary), var(--color-text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

/* === Features Section === */
.features {
    background: linear-gradient(180deg, var(--color-bg-primary) 0%, var(--color-bg-secondary) 100%);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
}

.feature-card {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur)) saturate(150%) brightness(110%);
    -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(150%) brightness(110%);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-default);
    padding: var(--spacing-xl);
    transition: all var(--transition-base);
}

.feature-card:hover {
    transform: translateY(-8px);
    border-color: var(--color-gradient-start);
    box-shadow: 0 16px 40px rgba(59, 130, 246, 0.2);
}

.feature-icon {
    width: 56px;
    height: 56px;
    margin-bottom: var(--spacing-md);
}

.feature-icon svg {
    width: 100%;
    height: 100%;
    color: var(--color-gradient-start);
}

.feature-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.feature-description {
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* === Demo Section === */
.demo {
    background: var(--color-bg-secondary);
}

.demo-container {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur)) saturate(150%) brightness(110%);
    -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(150%) brightness(110%);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-default);
    padding: var(--spacing-xl);
    max-width: 1000px;
    margin: 0 auto;
}

.demo-canvas {
    width: 100%;
    height: 400px;
    border-radius: var(--radius-default);
    background: rgba(10, 10, 15, 0.5);
    display: block;
    margin-bottom: var(--spacing-lg);
}

.demo-controls {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-lg);
}

.demo-btn {
    padding: 0.75rem 1.5rem;
    background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
    color: var(--color-text-primary);
    border: none;
    border-radius: var(--radius-full);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
}

.demo-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(59, 130, 246, 0.4);
}

.demo-legend {
    display: flex;
    gap: var(--spacing-lg);
    justify-content: center;
    flex-wrap: wrap;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--color-text-secondary);
}

.legend-dot {
    width: 12px;
    height: 12px;
    border-radius: var(--radius-full);
}

/* === Workflow Section === */
.workflow {
    background: var(--color-bg-primary);
}

.workflow-steps {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
    max-width: 1200px;
    margin: 0 auto;
}

.workflow-step {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur)) saturate(150%) brightness(110%);
    -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(150%) brightness(110%);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-default);
    padding: var(--spacing-lg);
    text-align: center;
    flex: 1;
    min-width: 200px;
    max-width: 250px;
    transition: all var(--transition-base);
}

.workflow-step:hover {
    transform: translateY(-8px);
    border-color: var(--color-gradient-start);
    box-shadow: 0 12px 30px rgba(59, 130, 246, 0.2);
}

.step-number {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--spacing-md);
    background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    font-weight: 800;
}

.step-title {
    font-size: 1.375rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.step-description {
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.workflow-arrow {
    font-size: 2rem;
    color: var(--color-gradient-start);
    flex-shrink: 0;
}

/* === Benefits Section === */
.benefits {
    background: linear-gradient(180deg, var(--color-bg-secondary) 0%, var(--color-bg-primary) 100%);
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    max-width: 1100px;
    margin: 0 auto;
}

.benefit-card {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur)) saturate(150%) brightness(110%);
    -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(150%) brightness(110%);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-default);
    padding: var(--spacing-xl);
    text-align: center;
    transition: all var(--transition-base);
}

.benefit-card:hover {
    transform: translateY(-8px);
    border-color: var(--color-accent);
    box-shadow: 0 12px 30px rgba(6, 182, 212, 0.2);
}

.benefit-metric {
    font-size: 3.5rem;
    font-weight: 900;
    background: linear-gradient(135deg, var(--color-gradient-start), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
}

.benefit-label {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
}

/* === Use Cases Section === */
.use-cases {
    background: var(--color-bg-primary);
}

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

.use-case-card {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur)) saturate(150%) brightness(110%);
    -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(150%) brightness(110%);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-default);
    padding: var(--spacing-xl);
    transition: all var(--transition-base);
}

.use-case-card:hover {
    transform: translateY(-8px);
    border-color: var(--color-gradient-end);
    box-shadow: 0 12px 30px rgba(139, 92, 246, 0.2);
}

.use-case-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.use-case-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.use-case-description {
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* === CTA Section === */
.cta-section {
    background: linear-gradient(180deg, var(--color-bg-primary) 0%, var(--color-bg-secondary) 100%);
    padding: var(--spacing-2xl) var(--spacing-md);
}

.cta-container {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur)) saturate(150%) brightness(110%);
    -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(150%) brightness(110%);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-default);
    padding: var(--spacing-2xl);
}

.cta-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    margin-bottom: var(--spacing-md);
}

.cta-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    line-height: 1.8;
}

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

.cta-note {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
}

/* === Footer === */
.footer {
    background: var(--color-bg-secondary);
    padding: var(--spacing-2xl) var(--spacing-md) var(--spacing-lg);
    border-top: 1px solid var(--glass-border);
}

.footer-container {
    max-width: 1280px;
    margin: 0 auto;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.footer-logo {
    width: 28px;
    height: 28px;
    color: var(--color-gradient-start);
}

.footer-title {
    font-size: 1.125rem;
    font-weight: 700;
}

.footer-description {
    color: var(--color-text-secondary);
    line-height: 1.7;
    max-width: 300px;
}

.footer-heading {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.footer-links {
    list-style: none;
}

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

.footer-links a {
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--glass-border);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-copyright {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
}

.footer-badges {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.badge {
    padding: 0.375rem 0.875rem;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    color: var(--color-text-secondary);
}

/* === Accessibility === */
@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;
    }
}

/* Focus visible for keyboard navigation */
:focus-visible {
    outline: 2px solid var(--color-gradient-start);
    outline-offset: 4px;
}

/* === Responsive Design === */
@media (max-width: 768px) {
    .nav-links {
        gap: var(--spacing-sm);
    }
    
    .nav-link {
        font-size: 0.9rem;
    }
    
    .nav-link-cta {
        padding: 0.4rem 1rem;
    }
    
    .hero {
        min-height: 90vh;
        padding: var(--spacing-xl) var(--spacing-md);
    }
    
    .hero-cta {
        flex-direction: column;
        align-items: stretch;
    }
    
    .btn {
        width: 100%;
    }
    
    .hero-stats {
        gap: var(--spacing-lg);
    }
    
    .features-grid,
    .use-cases-grid {
        grid-template-columns: 1fr;
    }
    
    .workflow-steps {
        flex-direction: column;
        align-items: stretch;
    }
    
    .workflow-arrow {
        transform: rotate(90deg);
        align-self: center;
    }
    
    .workflow-step {
        max-width: 100%;
    }
    
    .demo-canvas {
        height: 300px;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}

@media (min-width: 769px) and (max-width: 1280px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .use-cases-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --color-text-primary: #ffffff;
        --color-text-secondary: #e2e8f0;
        --glass-border: rgba(255, 255, 255, 0.3);
    }
}