/* --- Global Styles & Variables --- */
:root {
    --bg-color: #0a0f1e;
    --primary-color: #1a233d;
    --gradient-start: #1a233d;
    --gradient-end: #0a0f1e;
    --accent-color: #00aaff;
    --text-color: #e0e0e0;
    --heading-color: #ffffff;
    --card-bg: rgba(26, 35, 61, 0.6);
    --border-color: rgba(0, 170, 255, 0.2);
}

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

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

/* --- Particle Canvas Styling --- */
#particles-js {
    position: fixed;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    z-index: -1;
    background-image: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
}


/* --- Header & Navigation --- */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 1rem 5%;
    background: rgba(10, 15, 30, 0.5);
    backdrop-filter: blur(10px);
    z-index: 10;
    border-bottom: 1px solid var(--border-color);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
    max-width: 1200px;
    margin: 0 auto;
}

.nav-logo {
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--heading-color);
    text-decoration: none;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 2rem;
}

nav ul li a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 400;
    transition: color 0.3s ease;
    padding: 0.5rem 0;
    position: relative;
}

nav ul li a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--accent-color);
    transition: width 0.3s ease;
}

nav ul li a:hover, nav ul li a.active {
    color: var(--accent-color);
}

nav ul li a:hover::after, nav ul li a.active::after {
    width: 100%;
}

/* --- Mobile Nav Toggle --- */
.nav-toggle {
    display: none;
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-color);
    padding: 0.5rem;
    border-radius: 6px;
    cursor: pointer;
}

.nav-toggle:focus-visible {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

.hamburger {
    position: relative;
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--text-color);
    border-radius: 2px;
    transition: background-color 0.3s ease;
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--text-color);
    border-radius: 2px;
    transition: transform 0.3s ease, top 0.3s ease, background-color 0.3s ease;
}

.hamburger::before { top: -6px; }
.hamburger::after { top: 6px; }

nav.open .hamburger { background-color: transparent; }
nav.open .hamburger::before { top: 0; transform: rotate(45deg); }
nav.open .hamburger::after { top: 0; transform: rotate(-45deg); }


/* --- Main Content & Sections --- */
.main-content {
    position: relative;
    z-index: 1;
}

.hero {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    min-height: 100vh;
    padding: 0 5%;
}

.hero h1 {
    font-size: 4rem;
    font-weight: 600;
    color: var(--heading-color);
    margin-bottom: 0.5rem;
}

.hero p {
    font-size: 1.2rem;
    font-weight: 300;
    color: var(--text-color);
}

.page-content {
    max-width: 1000px;
    margin: 0 auto;
    padding: 120px 2rem 50px;
}

.page-content h2 {
    font-size: 2.5rem;
    color: var(--heading-color);
    text-align: center;
    margin-bottom: 1rem;
}

.subtitle {
    text-align: center;
    font-size: 1.1rem;
    color: var(--accent-color);
    margin-bottom: 3rem;
}

/* --- Tools Page --- */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 2rem;
    border-radius: 8px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 170, 255, 0.1);
}

.card h3 {
    color: var(--heading-color);
    margin-bottom: 0.75rem;
}

.btn {
    display: inline-block;
    margin-top: 1rem;
    padding: 0.6rem 1.2rem;
    background: transparent;
    border: 1px solid var(--accent-color);
    color: var(--accent-color);
    text-decoration: none;
    border-radius: 4px;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.btn:hover {
    background-color: var(--accent-color);
    color: var(--bg-color);
}

/* --- About Page --- */
.about-content p {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    text-align: center;
}

/* --- Contact Page --- */
.contact-section {
    text-align: center;
}

.contact-link {
    display: inline-block;
    background: var(--accent-color);
    color: var(--bg-color);
    padding: 1rem 2rem;
    border-radius: 5px;
    text-decoration: none;
    font-size: 1.2rem;
    font-weight: 600;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.contact-link:hover {
    transform: scale(1.05);
    box-shadow: 0 5px 15px rgba(0, 170, 255, 0.3);
}

.contact-link i {
    margin-right: 0.75rem;
}

/* --- Footer --- */
footer {
    text-align: center;
    padding: 2rem 5%;
    position: relative;
    z-index: 1;
    color: rgba(224, 224, 224, 0.5);
}

/* --- Responsive Design --- */
@media (max-width: 768px) {
    .nav-toggle {
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }

    nav ul {
        display: none;
        position: absolute;
        top: calc(100% + 10px);
        right: 5%;
        flex-direction: column;
        gap: 0.5rem;
        background: var(--card-bg);
        border: 1px solid var(--border-color);
        padding: 0.75rem 1rem;
        border-radius: 8px;
        width: min(90vw, 280px);
        box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
    }

    nav.open ul {
        display: flex;
    }

    .hero h1 {
        font-size: 2.5rem;
    }

    .hero p {
        font-size: 1rem;
    }
    
    .page-content {
        padding-top: 100px;
    }
}