/* Base Styles */
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: #000000;
    background-color: #fff;
    margin: 0;
    padding: 0;
}

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

h1,
h2 {
    border-bottom: 1px solid #eaecef;
    padding-bottom: 10px;
}

ul {
    list-style-type: none;
    padding-left: 20px;
    margin: 0;
}

a {
    color: #0366d6;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* Navbar Styles */
.top-menu {
    background-color: #000000;
    padding: 10px 0;
    color: white;
}

.menu-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
}

.menu-items {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
}

.menu-item {
    position: relative;
    color: white;
    padding: 10px 15px;
    cursor: pointer;
    white-space: nowrap;
}

.menu-item a {
    color: white;
    text-decoration: none;
    display: block;
}

.menu-item:hover {
    background-color: #444d56;
}

/* Sub-menu styles */
.sub-menu {
    display: none;
    position: absolute;
    top: calc(100% - 1px);
    /* avoid a 1px gap that breaks hover when moving mouse */
    left: 0;
    background-color: #000000;
    min-width: 200px;
    z-index: 1000;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
}

/* ensure submenu shows when parent hovered or keyboard-focused */
.menu-item:hover>.sub-menu,
.menu-item:focus-within>.sub-menu {
    display: block;
}

/* style submenu items and their hover */
.sub-menu .menu-item {
    padding: 0;
    /* anchor will handle padding for consistent hit area */
}

/* make anchors fill the item area and receive hover */
.sub-menu a {
    display: block;
    padding: 10px 15px;
    /* same spacing as top-level */
    color: white;
    text-decoration: none;
}

/* highlight submenu items on hover */
.sub-menu .menu-item:hover,
.sub-menu a:hover {
    background-color: #444d56;
}

/* nested sub-menus (flyouts) */
.sub-menu .sub-menu {
    left: 100%;
    top: 0;
}

/* small accessibility/UX nicety: keep submenu visible on focus too */
.sub-menu a:focus {
    outline: none;
    background-color: #444d56;
}

/* Social Links */
.social-links a {
    color: white;
    margin-left: 10px;
    text-decoration: none;
}

/* Mobile Toggle */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: white;
    font-size: 1.5em;
    cursor: pointer;
}

/* Responsive Navbar Styles */
@media (max-width: 768px) {
    .menu-container {
        flex-wrap: wrap;
    }

    .menu-toggle {
        display: block;
    }

    .menu-items {
        display: none;
        flex-direction: column;
        width: 100%;
        background-color: #000000;
    }

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

    .menu-item {
        width: 100%;
        box-sizing: border-box;
    }

    .sub-menu {
        position: static;
        display: none;
        box-shadow: none;
        padding-left: 20px;
    }

    .sub-menu .sub-menu {
        padding-left: 20px;
    }

    /* Disable hover on mobile, rely on click/active */
    .menu-item:hover>.sub-menu {
        display: none;
    }

    .menu-item.expanded>.sub-menu {
        display: block;
    }

    .social-links {
        margin-top: 10px;
    }
}

/* Content Accordion Styles */
.instructions {
    background-color: #f6f8fa;
    border: 1px solid #e1e4e8;
    border-radius: 6px;
    padding: 6px;
    margin-bottom: 20px;
}

.subject,
.category {
    margin-bottom: 15px;
}

.subject-title,
.category-title {
    cursor: pointer;
    background-color: #f6f8fa;
    border: 1px solid #d1d5da;
    border-radius: 3px;
    padding: 10px;
    font-weight: bold;
}

.subject-title {
    background-color: #0366d6;
    color: white;
}

.subject-content,
.category-content {
    display: none;
    padding: 10px;
    border: 1px solid #d1d5da;
    border-top: none;
    border-radius: 0 0 3px 3px;
}

/* Index Page Specific Styles */
.hero {
    background-image: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url('https://yourimageurl.com/hero-image.jpg');
    background-color: #333;
    /* Fallback color */
    background-size: cover;
    background-position: center;
    color: white;
    text-align: center;
    /* padding: 100px 20px; */
    box-shadow: inset 0px 0px 100px rgba(0, 0, 0, 0.5);
}

.hero h1 {
    font-size: 3em;
    margin: 0 0 20px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    border-bottom: none;
    /* Override base h1 style */
}

.hero p {
    font-size: 1.2em;
    margin: 0 0 30px;
    text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.3);
}

.text-3d {
    color: black;
    text-shadow:
        0 1px 0 #ccc,
        0 2px 0 #c9c9c9,
        0 3px 0 #bbb,
        0 4px 0 #b9b9b9,
        0 5px 0 #aaa,
        0 6px 1px rgba(0, 0, 0, .1),
        0 0 5px rgba(0, 0, 0, .1),
        0 1px 3px rgba(0, 0, 0, .3),
        0 3px 5px rgba(0, 0, 0, .2),
        0 5px 10px rgba(0, 0, 0, .25),
        0 10px 10px rgba(0, 0, 0, .2),
        0 20px 20px rgba(0, 0, 0, .15);
}

.text-3d-p {
    color: black;
    font-weight: bold;
    text-shadow:
        0 1px 0 #ccc,
        0 2px 0 #c9c9c9,
        0 3px 0 #bbb,
        0 4px 0 #b9b9b9,
        0 5px 0 #aaa,
        0 6px 1px rgba(0, 0, 0, .1),
        0 0 5px rgba(0, 0, 0, .1),
        0 1px 3px rgba(0, 0, 0, .3),
        0 3px 5px rgba(0, 0, 0, .2),
        0 5px 10px rgba(0, 0, 0, .25),
        0 10px 10px rgba(0, 0, 0, .2),
        0 20px 20px rgba(0, 0, 0, .15);
}

.hero .btn {
    background-color: #00C853;
    color: white;
    padding: 10px 20px;
    text-decoration: none;
    font-size: 1.2em;
    border-radius: 15px;
    box-shadow: 0px 5px 10px rgba(0, 0, 0, 0.3);
    transition: background-color 0.2s, transform 0.2s;
}

.hero .btn:hover {
    background-color: #00A843;
    transform: scale(1.05);
}

.subjects {
    padding: 20px 20px;
    background-color: #ffffff;
}

.subjects h2 {
    text-align: center;
    margin-bottom: 30px;
    color: #000000;
    text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.3);
}

.subject-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.subject-card {
    background-color: #dadada;
    border-radius: 15px;
    overflow: hidden;
    text-align: center;
    box-shadow: 0px 6px 12px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s, box-shadow 0.3s;
}

.subject-card:hover {
    transform: translateY(-10px);
    box-shadow: 0px 10px 20px rgba(0, 0, 0, 0.3);
}

.subject-card img {
    width: 100%;
    height: 150px;
    object-fit: cover;
}

.subject-card h3 {
    margin: 20px 0;
    font-size: 1.4em;
    color: #000000;
    text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.2);
}

.subject-card a {
    display: inline-block;
    margin-bottom: 20px;
    padding: 10px 20px;
    color: white;
    background-color: #FF5722;
    text-decoration: none;
    border-radius: 10px;
    transition: background-color 0.2s, transform 0.2s;
}

.subject-card a:hover {
    background-color: #E64A19;
    transform: scale(1.05);
    text-decoration: none;
}