/* === Base Reset === */
* {
    margin: 0;
    box-sizing: border-box;
    font-family: "Arial Rounded MT Bold", Arial, sans-serif;
    scrollbar-width: none;
}

body {
    background: #000;
    color: #fff;
    display: flex;
    flex-direction: column;
}

/* === Common Elements === */
a {
    color: #fff;
    text-decoration: none;
    cursor: pointer;
}

.logo {
    height: 1.8rem;
}

.logo-box {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.9rem;
}

/* === Navbar === */
.nav-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 10px;
    height: 50px;
    font-size: 1.2rem;
}

.nav-links {
    display: flex;
    gap: 2rem;
    justify-content: center;
    align-items: center;
}

/* === Hamburger Icon === */
.hamburger-icon {
    display: none;
    flex-direction: column;
    cursor: pointer;
    margin-right: 20px;
}

.hamburger-icon span {
    display: block;
    width: 25px;
    height: 3px;
    background: #fff;
    margin: 4px 0;
    border-radius: 3px;
}

/* === Mobile Menu === */
.hamburger-menu {
    display: none;
    flex-direction: column;
    background: #111;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    padding: 2rem;
    z-index: 999;
}

.nav-links-mobile {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-top: 2rem;
}

/* === Main Body / Hero === */
.main-body {
    display: flex;
    justify-content: center;
    margin-top: 30px;
    padding: 0 2rem;
}

.main-content {
    max-width: 720px;
    line-height: 1.5;
    text-align: center;
}

.eyebrow {
    display: inline-block;
    color: #4fd1c5;
    font-size: 0.95rem;
    font-weight: bold;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    margin-bottom: 0.8rem;
}

.main-content h1 {
    font-size: 2.6rem;
    margin-bottom: 1rem;
}

.main-content p {
    font-size: 1.1rem;
    color: #b8b8b8;
    line-height: 1.7;
}

/* === Topic Card Grid === */
.topic-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    max-width: 1200px;
    margin: 3rem auto;
    padding: 0 2rem;
}

.topic-card {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.6rem;
    padding: 1.8rem;
    border: 1px solid #2a2a2a;
    border-radius: 14px;
    background: #0d0d0d;
    transition: all 0.25s ease;
}

.topic-card:hover {
    border-color: #4fd1c5;
    background: #101414;
    transform: translateY(-4px);
    box-shadow: 0 10px 24px rgba(0, 0, 0, 0.5);
}

.topic-card-icon {
    font-size: 2.2rem;
}

.topic-card-title {
    font-size: 1.3rem;
    font-weight: bold;
}

.topic-card-desc {
    font-size: 0.92rem;
    color: #a8a8a8;
    line-height: 1.5;
}

/* === Footer === */
.site-footer {
    text-align: center;
    color: #666;
    font-size: 0.85rem;
    padding: 2rem 1rem 3rem;
}

/* === Responsive Design === */
@media screen and (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .hamburger-icon {
        display: flex;
    }

    .hamburger-menu.active {
        display: flex;
    }
}