/* Global Variables */
:root {
    --highlight-blue: #009ffd;
    --dark-bg: #000000;
    --text-white: #ffffff;
    --light-gray: #dcdcdc;
}

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

body {
    background-color: var(--dark-bg);
    color: var(--text-white);
    font-family: 'Poppins', sans-serif;
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Progress Bar */
.progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    height: 4px;
    background: var(--highlight-blue);
    width: 0%;
    z-index: 1001;
    transition: width 0.3s ease;
}

/* Navigation */
.nav-container {
    background: rgba(0, 0, 0, 0.85);
    position: fixed;
    width: 100%;
    top: 0;
    left: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
}

.nav-menu {
    display: flex;
    justify-content: center;
    list-style: none;
    padding: 20px 0;
}

.nav-menu li {
    margin: 0 15px;
}

.nav-menu a {
    color: var(--text-white);
    text-decoration: none;
    font-weight: 500;
    font-size: 1rem;
    transition: color 0.3s ease;
}

.nav-menu a:hover {
    color: var(--highlight-blue);
}

/* Hero Section */
.hero {
    background-color: rgba(0, 0, 0, 0.7);
    padding: 120px 0 60px;
    text-align: center;
}

.hero h1 {
    font-size: 2.8rem;
    margin-bottom: 20px;
    line-height: 1.3;
}

.author-info {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 20px;
    font-size: 0.9rem;
    color: #aaa;
}

/* Main Content */
main {
    padding: 60px 0;
}

.lead {
    font-size: 1.25rem;
    line-height: 1.7;
    margin-bottom: 40px;
    text-align: left;
    color: var(--light-gray);
}

h2 {
    font-size: 2rem;
    margin: 40px 0 20px;
    color: var(--highlight-blue);
    text-align: left;
}

h3 {
    font-size: 1.5rem;
    margin: 30px 0 15px;
    color: var(--text-white);
    text-align: left;
}

p {
    margin-bottom: 20px;
    text-align: left;
}

strong {
    color: var(--highlight-blue);
    font-weight: 600;
}

/* Feature Grid */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin: 40px 0;
}

.feature {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 10px;
    padding: 25px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0, 159, 253, 0.2);
}

.feature h2, .feature h3 {
    color: var(--highlight-blue);
    margin-top: 0;
    text-align: left;
}

.feature p {
    margin-bottom: 0;
    text-align: left;
}

/* Highlight Box */
.highlight-box {
    background: linear-gradient(135deg, rgba(0, 159, 253, 0.1), rgba(0, 0, 0, 0.7));
    border-left: 4px solid var(--highlight-blue);
    border-radius: 5px;
    padding: 25px;
    margin: 30px 0;
}

.highlight-box h3 {
    color: var(--highlight-blue);
    margin-top: 0;
}

.highlight-box ul {
    margin: 15px 0 0;
    padding-left: 20px;
}

.highlight-box li {
    margin-bottom: 10px;
}

/* Quote Box */
.quote-box {
    padding: 30px;
    margin: 40px 0;
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.05);
}

blockquote {
    font-style: italic;
    border-left: 3px solid var(--highlight-blue);
    padding-left: 20px;
    color: #ccc;
}

cite {
    display: block;
    text-align: right;
    margin-top: 10px;
    font-style: normal;
    color: var(--highlight-blue);
}

/* CTA Button */
.cta-button {
    display: inline-block;
    background: var(--highlight-blue);
    color: #000;
    padding: 12px 30px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 700;
    margin-top: 20px;
    transition: background 0.3s ease, transform 0.3s ease;
}

.cta-button:hover {
    background: #fff;
    transform: scale(1.05);
}

/* Footer */
footer {
    background: rgba(0, 0, 0, 0.8);
    padding: 40px 0;
    text-align: center;
}

footer p {
    margin: 10px 0;
    font-size: 0.9rem;
    color: #999;
    text-align: center;
}

footer a {
    color: var(--highlight-blue);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
    }
    
    .feature-grid {
        grid-template-columns: 1fr;
    }
    
    .nav-menu {
        flex-direction: column;
        align-items: center;
    }
    
    .nav-menu li {
        margin: 5px 0;
    }
}