:root {
    --background-color: #0a0a0a;
    --surface-color: #1a1a1a;
    --border-color: rgba(255, 255, 255, 0.1);
    --text-color: #e5e5e5;
    --primary-color: #a855f7;
    /* purple-500 */
    --secondary-text-color: #a3a3a3;
    /* gray-400 */
}

html {
    scroll-behavior: smooth;
}

/* Basic Reset & Typography */
body {

    font-family: 'Inter', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    margin: 0;
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    width: 90%;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 1rem;
}

h1,
h2,
h3 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-color);
}

h1 {
    font-size: 3.5rem;
    font-weight: 800;
    letter-spacing: -0.02em;
}

h2 {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 1rem;
}

h3 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 0.75rem;
}

p {
    color: var(--secondary-text-color);
}

a {
    color: var(--primary-color);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* Header */
.main-header {
    padding: 1.5rem 0;
    border-bottom: 1px solid var(--border-color);
    background-color: rgba(10, 10, 10, 0.8);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 10;
}

.main-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

/* Navigation */
.main-nav ul {
    margin: 0;
    padding: 0;
    list-style: none;
    display: flex;
    gap: 2rem;
}

.main-nav a {
    color: var(--secondary-text-color);
    font-weight: 500;
    transition: color 0.2s ease-in-out, border-color 0.2s ease-in-out;
    padding-bottom: 0.25rem;
    border-bottom: 2px solid transparent;
}

.main-nav a:hover {
    color: var(--text-color);
    text-decoration: none;
}

.main-nav a.active {
    color: var(--text-color);
    border-bottom-color: var(--primary-color);
}

/* Hero Section */
#hero {
    padding: 8rem 0;
    text-align: center;
    background: radial-gradient(ellipse at top, #2a0e41, var(--background-color) 70%);
}

#hero .subtitle {
    font-size: 1.25rem;
    max-width: 650px;
    margin: 1.5rem auto 0;
    color: var(--secondary-text-color);
}

/* Common Section Styling */
section {
    padding: 6rem 0;
}

.section-subtitle {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 4rem;
    font-size: 1.125rem;
}

/* Vision Section */
#vision {
    background-color: #111;
}

.vision-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.vision-card {
    background-color: var(--surface-color);
    padding: 2rem;
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

/* Mission Section */
.mission-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    font-size: 1.125rem;
}

/* Contact Section */
#contact {
    background-color: var(--background-color);
}

.contact-action {
    text-align: center;
}

.btn-primary {
    padding: 0.875rem 1.5rem;
    font-size: 1rem;
    font-weight: 700;
    color: #fff;
    background-color: var(--primary-color);
    border: none;
    border-radius: 0.375rem;
    cursor: pointer;
    transition: background-color 0.2s;
    display: inline-block;
}

.btn-primary:hover {
    background-color: #9333ea;
    /* purple-600 */
    text-decoration: none;
}

/* Footer */
.main-footer {
    padding: 2rem 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
    color: var(--secondary-text-color);
    font-size: 0.875rem;
}

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

    h2 {
        font-size: 2rem;
    }

    section {
        padding: 4rem 0;
    }

    #hero {
        padding: 6rem 0;
    }

    .main-nav {
        display: none;
    }

    .main-header .container {
        justify-content: center;
    }
}