:root {
    --bg-color: #09090b;
    /* User defined dark bg */
    --text-color: #f8fafc;
    --primary-color: #155dfc;
    /* User defined secondary/primary */
    --accent-color: #fbbf24;
    --card-bg: #18181b;
    /* Slightly lighter than bg for zinc-950/900 contrast */
    --white: #ffffff;
    --font-family: 'Inter', system-ui, -apple-system, sans-serif;
    --spacing-md: 1rem;
    --spacing-lg: 2rem;
    --border-radius: 8px;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

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

ul {
    list-style: none;
}

/* Typography */
h1,
h2,
h3 {
    color: var(--text-color);
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: 2.5rem;
}

h2 {
    font-size: 2rem;
}

h3 {
    font-size: 1.5rem;
}

/* Buttons */
.btn-primary {
    background-color: var(--primary-color);
    color: var(--white);
    /* White text on vivid blue */
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    font-weight: 600;
    transition: all 0.3s;
    display: inline-block;
}

.btn-primary:hover {
    background-color: #3b82f6;
    /* Lighter blue */
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(21, 93, 252, 0.4);
}

/* Layout - Enhanced Placeholders */
header {
    background-color: rgba(9, 9, 11, 0.95);
    /* Dark bg #09090b */
    backdrop-filter: blur(10px);
    padding: var(--spacing-md) var(--spacing-lg);
    box-shadow: 0 1px 3px rgba(255, 255, 255, 0.05);
    /* Light shadow */
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.logo {
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--white);
}

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

.nav-links a:not(.btn-primary) {
    font-weight: 500;
    color: var(--text-color);
    transition: color 0.2s;
    opacity: 0.8;
}

.nav-links a:not(.btn-primary):hover {
    color: var(--primary-color);
    opacity: 1;
}

section {
    padding: 6rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
}

#hero {
    background: radial-gradient(circle at top right, #18181b 0%, #09090b 100%);
    border-radius: 0 0 3rem 3rem;
    padding-top: 8rem;
    padding-bottom: 8rem;
    margin-bottom: 4rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

#hero h1 {
    font-size: 3.5rem;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    background: linear-gradient(to right, #ffffff, #a1a1aa);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

#hero p {
    font-size: 1.25rem;
    color: #a1a1aa;
    max-width: 600px;
    margin: 0 auto 2.5rem;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2.5rem;
    margin-top: 3rem;
}

.feature-card {
    background: var(--card-bg);
    padding: 2.5rem;
    border-radius: 1rem;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
    transition: transform 0.3s, box-shadow 0.3s;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 25px -5px rgba(21, 93, 252, 0.15);
    /* Blue glow */
    border-color: var(--primary-color);
}

.feature-card h3 {
    margin-bottom: 1rem;
    color: var(--white);
}

#cta {
    background: linear-gradient(135deg, #18181b 0%, #09090b 100%);
    color: var(--white);
    border-radius: 2rem;
    margin: 4rem auto;
    padding: 6rem 2rem;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

#cta h2 {
    color: var(--white);
    margin-bottom: 2rem;
}

#cta .btn-primary {
    background-color: var(--primary-color);
    color: var(--white);
    /* White text */
}

#cta .btn-primary:hover {
    background-color: #3b82f6;
}

footer {
    background-color: #000000;
    /* Pure black for footer */
    color: #71717a;
    padding: 4rem 2rem;
    border-top: 1px solid #27272a;
}

.social-links {
    margin-top: 1.5rem;
    display: flex;
    justify-content: center;
    gap: 2rem;
}

.social-links a {
    transition: color 0.2s;
}

.social-links a:hover {
    color: var(--primary-color);
}

/* Response Adjustments */
@media (max-width: 768px) {
    #hero h1 {
        font-size: 2.5rem;
    }

    .mobile-menu-toggle {
        display: block;
        z-index: 101;
    }

    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        height: 100vh;
        width: 70%;
        max-width: 300px;
        background-color: var(--card-bg);
        display: flex;
        flex-direction: column;
        justify-content: center;
        box-shadow: -5px 0 15px rgba(0, 0, 0, 0.3);
        transition: right 0.3s ease-in-out;
        padding: 2rem;
        z-index: 100;
        border-left: 1px solid rgba(255, 255, 255, 0.05);
    }

    .nav-links.active {
        right: 0;
    }
}

/* Mobile Menu Toggle Button */
.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
}

.bar {
    display: block;
    width: 25px;
    height: 3px;
    margin: 5px auto;
    -webkit-transition: all 0.3s ease-in-out;
    transition: all 0.3s ease-in-out;
    background-color: var(--primary-color);
}

/* Toggle Animation */
.mobile-menu-toggle.active .bar:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active .bar:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

.mobile-menu-toggle.active .bar:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}