/* VCweb Design System */
:root {
    /* Colors - HSL */
    --hue-primary: 250;
    /* Deep Purple/Blue */
    --hue-secondary: 190;
    /* Cyan */
    --hue-accent: 320;
    /* Pinkish-Purple */

    --color-bg-base: hsl(var(--hue-primary), 20%, 4%);
    --color-bg-surface: hsl(var(--hue-primary), 20%, 8%);
    --color-bg-elevated: hsl(var(--hue-primary), 20%, 12%);

    --color-text-main: hsl(0, 0%, 95%);
    --color-text-muted: hsl(250, 10%, 70%);
    --color-text-accent: hsl(var(--hue-secondary), 90%, 60%);

    --color-primary: hsl(var(--hue-primary), 80%, 60%);
    --color-secondary: hsl(var(--hue-secondary), 80%, 50%);
    --color-accent: hsl(var(--hue-accent), 80%, 60%);

    --gradient-main: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    --gradient-dark: linear-gradient(to bottom, var(--color-bg-base), var(--color-bg-surface));

    /* Typography */
    --font-main: 'Inter', system-ui, -apple-system, sans-serif;
    --font-display: 'Outfit', sans-serif;

    /* Spacing */
    --space-unit: 1rem;
    --space-xs: calc(var(--space-unit) * 0.5);
    --space-sm: var(--space-unit);
    --space-md: calc(var(--space-unit) * 2);
    --space-lg: calc(var(--space-unit) * 4);
    --space-xl: calc(var(--space-unit) * 8);

    /* Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 20px rgba(100, 100, 255, 0.2);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    background-color: var(--color-bg-base);
    color: var(--color-text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--space-md);
    color: white;
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4.5rem);
    letter-spacing: -0.02em;
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
}

h3 {
    font-size: clamp(1.5rem, 3vw, 2.25rem);
}

p {
    margin-bottom: var(--space-md);
    color: var(--color-text-muted);
    font-size: 1.125rem;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.3s ease;
}

ul {
    list-style: none;
}

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

/* Utilities */
.container {
    width: 90%;
    max-width: 1200px;
    margin-inline: auto;
    padding-inline: var(--space-sm);
}

.section {
    padding-block: var(--space-xl);
}

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-full);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: var(--font-display);
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 30px rgba(100, 100, 255, 0.4);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--color-text-muted);
    color: var(--color-text-main);
}

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

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding-block: var(--space-sm);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

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

.logo {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 800;
    color: white;
    letter-spacing: -0.03em;
}

.nav-list {
    display: flex;
    gap: var(--space-md);
}

@media (max-width: 768px) {
    .nav-list {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: var(--color-bg-elevated);
        flex-direction: column;
        padding: var(--space-md);
        text-align: center;
    }

    .nav-list.active {
        display: flex;
    }

    .mobile-toggle {
        display: block;
        cursor: pointer;
    }
}

@media (min-width: 769px) {
    .mobile-toggle {
        display: none;
    }
}

/* Hero */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: var(--space-xl);
    background: radial-gradient(circle at top right, rgba(100, 50, 255, 0.15), transparent 40%),
        radial-gradient(circle at bottom left, rgba(0, 200, 255, 0.1), transparent 40%);
}

.hero-content {
    max-width: 800px;
}

.hero-badges {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-full);
    border: 1px solid rgba(255, 255, 255, 0.1);
    margin-bottom: var(--space-md);
    font-size: 0.875rem;
    color: var(--color-secondary);
}

/* Grid Layouts */
.grid-2 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-lg);
    align-items: center;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-md);
}

/* Cards */
.card {
    background: var(--color-bg-surface);
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: transform 0.3s ease, border-color 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    border-color: var(--color-primary);
}

.card-icon {
    font-size: 2rem;
    margin-bottom: var(--space-md);
    color: var(--color-secondary);
}

/* FAQ */
.faq-item {
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    margin-bottom: var(--space-md);
}

.faq-header {
    padding-block: var(--space-md);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    font-family: var(--font-display);
}

.faq-body {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    color: var(--color-text-muted);
}

.faq-body.open {
    max-height: 500px;
    padding-bottom: var(--space-md);
}

/* Footer */
.footer {
    background: var(--color-bg-elevated);
    padding-block: var(--space-xl);
    margin-top: var(--space-xl);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-link {
    display: block;
    margin-bottom: var(--space-xs);
    color: var(--color-text-muted);
}

.footer-link:hover {
    color: var(--color-primary);
}

/* Animations */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}