/* Custom CSS for the cyber theme */
:root {
    --bg-dark: #0d1117; /* GitHub dark background */
    --bg-light: #161b22; /* GitHub dark lighter */
    --border-color: #30363d;
    --text-light: #e0e0e0;
    --text-dark: #b0b0b0;
    --accent-green: #00ff9b;
    --accent-blue: #00cfff;
    --font-main: 'Inter', sans-serif;
}

/* Smooth scroll behavior */
html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-light);
    font-family: var(--font-main);
}

/* Custom scrollbar */
body::-webkit-scrollbar {
    width: 8px;
}
body::-webkit-scrollbar-track {
    background: var(--bg-dark);
}
body::-webkit-scrollbar-thumb {
    background-color: var(--accent-green);
    border-radius: 20px;
}

/* Neon Text Effects */
.text-neon-green {
    color: var(--accent-green);
    text-shadow: 0 0 5px rgba(0, 255, 155, 0.7), 0 0 10px rgba(0, 255, 155, 0.5);
}
.text-neon-blue {
    color: var(--accent-blue);
    text-shadow: 0 0 5px rgba(0, 207, 255, 0.7), 0 0 10px rgba(0, 207, 255, 0.5);
}

/* Sticky Navbar Styling */
.sticky-nav {
    background-color: rgba(13, 17, 23, 0.85); /* 85% opacity dark bg */
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
}

/* Active Nav Link */
.nav-link.active {
    color: var(--accent-green);
    font-weight: 600;
}

/* Hero Section Gradient */
.hero-bg {
    background: radial-gradient(circle at 50% 50%, rgba(0, 255, 155, 0.05) 0%, rgba(13, 17, 23, 0) 60%);
}

/* Custom Button */
.btn-neon {
    position: relative;
    display: inline-block;
    padding: 12px 28px;
    font-weight: 600;
    border: 2px solid var(--accent-green);
    color: var(--accent-green);
    background-color: transparent;
    border-radius: 8px;
    text-transform: uppercase;
    letter-spacing: 1px;
    overflow: hidden;
    transition: all 0.4s ease;
    z-index: 1;
}

.btn-neon:before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--accent-green);
    transition: all 0.4s ease;
    z-index: -1;
}

.btn-neon:hover {
    color: var(--bg-dark);
}

.btn-neon:hover:before {
    left: 0;
}

.btn-neon-blue {
    border-color: var(--accent-blue);
    color: var(--accent-blue);
}
.btn-neon-blue:before {
    background: var(--accent-blue);
}
.btn-neon-blue:hover {
    color: var(--bg-dark);
}

/* Info Cards */
.info-card {
    background-color: var(--bg-light);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    transition: all 0.3s ease;
}

.info-card:hover {
    transform: translateY(-8px);
    border-color: var(--accent-green);
    box-shadow: 0 10px 25px rgba(0, 255, 155, 0.1);
}

/* Section Title */
.section-title {
    position: relative;
    display: inline-block;
    padding-bottom: 10px;
}
.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 50%;
    height: 3px;
    background-color: var(--accent-green);
}

/* Quiz Styling */
.quiz-option {
    display: block;
    background-color: var(--bg-light);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px 16px;
    margin-bottom: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
}
.quiz-option:hover {
    background-color: #1f2630;
    border-color: var(--accent-blue);
}

/* Hide radio button */
.quiz-option input[type="radio"] {
    display: none;
}

/* Style label when radio is checked */
.quiz-option input[type="radio"]:checked + label {
    color: var(--accent-blue);
    font-weight: 600;
}
.quiz-option input[type="radio"]:checked + label::before {
    content: '\f058'; /* FontAwesome check-circle */
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    margin-right: 10px;
    color: var(--accent-blue);
}

/* Elements to be revealed by ScrollReveal */
.reveal {
    visibility: hidden;
}