/* ===================================
   PersistData - Premium Design System
   =================================== */

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

:root {
    /* Colors */
    --color-bg: #0a0a0a;
    --color-bg-elevated: #141414;
    --color-text: #ffffff;
    --color-text-muted: #a0a0a0;
    --color-accent: #6366f1;
    --color-accent-bright: #818cf8;
    --color-success: #10b981;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #d946ef 100%);
    --gradient-subtle: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    /* Spacing */
    --section-padding: clamp(4rem, 10vw, 8rem);

    /* Animations */
    --transition-smooth: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: all 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

html {
    scroll-behavior: smooth;
}

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

/* ===================================
   Animated Background
   =================================== */

.bg-grid {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        linear-gradient(rgba(99, 102, 241, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(99, 102, 241, 0.05) 1px, transparent 1px);
    background-size: 50px 50px;
    z-index: 0;
    pointer-events: none;
}

.data-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    pointer-events: none;
    opacity: 0.4;
}

/* ===================================
   Header
   =================================== */

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 1.5rem 2rem;
    backdrop-filter: blur(20px) saturate(180%);
    background: rgba(10, 10, 10, 0.7);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.header-inner {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.25rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ===================================
   Hero Section
   =================================== */

.hero-section {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 8rem 2rem 4rem;
    z-index: 10;
    overflow: hidden;
}

.hero-content {
    max-width: 900px;
    text-align: center;
    position: relative;
    z-index: 20;
    animation: fadeInUp 1s ease-out;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 5rem);
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: 1.5rem;
    color: var(--color-text);
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    position: relative;
    display: inline-block;
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--color-text-muted);
    margin-bottom: 3rem;
    line-height: 1.7;
    font-weight: 400;
}

.cta-primary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2.5rem;
    background: var(--color-accent);
    color: white;
    text-decoration: none;
    border-radius: 12px;
    font-weight: 600;
    font-size: 1rem;
    transition: var(--transition-smooth);
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
}

.cta-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.cta-primary:hover::before {
    left: 100%;
}

.cta-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 40px rgba(99, 102, 241, 0.4);
    background: var(--color-accent-bright);
}

.cta-primary .arrow-icon {
    transition: transform 0.3s ease;
}

.cta-primary:hover .arrow-icon {
    transform: translateX(4px);
}

.hero-visual {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 800px;
    height: 800px;
    z-index: 5;
    pointer-events: none;
}

.data-orb {
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.15) 0%, transparent 70%);
    animation: pulse 8s ease-in-out infinite;
    filter: blur(60px);
}

/* ===================================
   Features Section
   =================================== */

.features-section {
    position: relative;
    z-index: 10;
    padding: var(--section-padding) 2rem;
}

.features-grid {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    padding: 3rem 2rem;
    background: var(--color-bg-elevated);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 20px;
    transition: var(--transition-smooth);
    opacity: 0;
    transform: translateY(30px);
}

.feature-card.aos-animate {
    opacity: 1;
    transform: translateY(0);
}

.feature-card:hover {
    transform: translateY(-8px);
    border-color: rgba(99, 102, 241, 0.3);
    background: rgba(99, 102, 241, 0.05);
    box-shadow: 0 20px 60px rgba(99, 102, 241, 0.15);
}

.feature-icon {
    width: 64px;
    height: 64px;
    margin-bottom: 1.5rem;
    color: var(--color-accent);
    display: flex;
    align-items: center;
    justify-content: center;
}

.feature-icon svg {
    width: 100%;
    height: 100%;
}

.feature-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.feature-card p {
    color: var(--color-text-muted);
    line-height: 1.7;
    font-size: 1rem;
}

/* ===================================
   Stats Section
   =================================== */

.stats-section {
    position: relative;
    z-index: 10;
    padding: var(--section-padding) 2rem;
    background: var(--gradient-subtle);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.stats-grid {
    max-width: 1000px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 4rem;
    text-align: center;
}

.stat-item {
    opacity: 0;
    transform: scale(0.9);
    transition: var(--transition-smooth);
}

.stat-item.aos-animate {
    opacity: 1;
    transform: scale(1);
}

.stat-number {
    font-size: clamp(3rem, 5vw, 4.5rem);
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    margin-bottom: 0.5rem;
    letter-spacing: -0.03em;
}

.stat-label {
    font-size: 1rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-weight: 500;
}

/* ===================================
   Use Cases Section
   =================================== */

.use-cases-section {
    position: relative;
    z-index: 10;
    padding: var(--section-padding) 2rem;
    text-align: center;
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    margin-bottom: 3rem;
    letter-spacing: -0.02em;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.use-cases-grid {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
}

.use-case-tag {
    padding: 0.75rem 1.5rem;
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: 50px;
    font-weight: 500;
    color: var(--color-accent-bright);
    transition: var(--transition-smooth);
    cursor: default;
}

.use-case-tag:hover {
    background: rgba(99, 102, 241, 0.2);
    transform: translateY(-2px);
}

/* ===================================
   Final CTA Section
   =================================== */

.final-cta {
    position: relative;
    z-index: 10;
    padding: var(--section-padding) 2rem;
    text-align: center;
}

.final-cta h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.final-cta p {
    font-size: 1.25rem;
    color: var(--color-text-muted);
    margin-bottom: 2.5rem;
}

/* ===================================
   Footer
   =================================== */

.site-footer {
    position: relative;
    z-index: 10;
    padding: 3rem 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-left p {
    color: var(--color-text-muted);
    font-size: 0.875rem;
    margin-top: 0.5rem;
}

.logo-small {
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.footer-right a {
    color: var(--color-text-muted);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-right a:hover {
    color: var(--color-accent);
}

/* ===================================
   Animations
   =================================== */

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 0.15;
    }
    50% {
        transform: scale(1.2);
        opacity: 0.25;
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-20px);
    }
}

/* ===================================
   Responsive Design
   =================================== */

@media (max-width: 768px) {
    .site-header {
        padding: 1rem 1.5rem;
    }

    .hero-section {
        padding: 6rem 1.5rem 3rem;
        min-height: 90vh;
    }

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

    .hero-subtitle {
        font-size: 1rem;
    }

    .features-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .stats-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

    .footer-content {
        flex-direction: column;
        gap: 2rem;
        text-align: center;
    }

    .hero-visual {
        width: 500px;
        height: 500px;
    }
}

/* ===================================
   Scroll Reveal Utilities
   =================================== */

[data-aos] {
    transition-property: opacity, transform;
    transition-duration: 0.8s;
    transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
}

[data-aos="fade-up"] {
    opacity: 0;
    transform: translateY(30px);
}

[data-aos="fade-up"].aos-animate {
    opacity: 1;
    transform: translateY(0);
}

/* Delay utilities */
[data-delay="100"] {
    transition-delay: 100ms;
}

[data-delay="200"] {
    transition-delay: 200ms;
}

[data-delay="300"] {
    transition-delay: 300ms;
}