@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;700;900&display=swap');

:root {
    --bg-color: #f0f2f5;
    --card-bg: #ffffff;
    --text-color: #1a1a1a;
    --accent-color: #6c5ce7;
    --nav-bg: #ffffff;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--bg-color);
    margin: 0;
    color: var(--text-color);
    padding-bottom: 50px;
}

/* --- Navigation Bar --- */
nav {
    background-color: var(--nav-bg);
    padding: 1rem 2rem;
    box-shadow: var(--shadow);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.site-logo {
    font-size: 1.5rem;
    font-weight: 900;
    color: var(--accent-color);
    text-transform: uppercase;
    letter-spacing: -1px;
    border: 2px solid var(--accent-color);
    padding: 5px 10px;
    border-radius: 8px;
    text-decoration: none; /* In case you make it a link later */
}

/* --- Hero Section --- */
.hero {
    background: linear-gradient(135deg, #6c5ce7 0%, #a29bfe 100%);
    color: white;
    text-align: center;
    padding: 3rem 1rem;
    margin-bottom: 2rem;
}

.hero h1 {
    font-size: 2.5rem;
    margin: 0;
    text-shadow: 2px 2px 0px rgba(0,0,0,0.2);
}

.hero p {
    font-size: 1.1rem;
    opacity: 0.9;
    margin-top: 10px;
}

/* --- Main Layout --- */
.container {
    max-width: 1000px; /* Wider container for grid */
    margin: 0 auto;
    padding: 0 20px;
}

/* Grid for Categories */
.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    align-items: start; /* Prevents cards from stretching weirdly */
}

/* --- Theme Cards --- */
.theme-card {
    background: var(--card-bg);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform 0.2s, box-shadow 0.2s;
    border: 1px solid #e1e4e8;
}

.theme-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

.theme-header {
    padding: 20px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 700;
    font-size: 1.2rem;
    background: white;
}

/* Specific Border Colors for Fun */
.card-holidays { border-top: 5px solid #ff7675; }
.card-sports { border-top: 5px solid #00b894; }
.card-science { border-top: 5px solid #0984e3; }

/* The Arrow */
.arrow {
    font-size: 0.8rem;
    transition: transform 0.3s;
    color: #888;
}

.subcategory-dropdown:not(.hidden) ~ .theme-header .arrow, /* Logic helper */
.theme-card.active .arrow {
    transform: rotate(180deg);
}

/* Dropdown Menu */
.subcategory-dropdown {
    background: #fafafa;
    border-top: 1px solid #eee;
    animation: slideDown 0.3s ease-out;
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

.subcategory-dropdown a {
    display: block;
    padding: 12px 20px;
    text-decoration: none;
    color: #555;
    font-weight: 500;
    border-bottom: 1px solid #f0f0f0;
    transition: all 0.2s;
}

.subcategory-dropdown a:hover {
    background-color: #fff;
    padding-left: 25px;
    color: var(--accent-color);
}

/* --- Quiz Page Specifics (Keep these for quiz.html) --- */
.back-btn {
    display: inline-block;
    margin-top: 0;
    color: #555;
    font-weight: bold;
    text-decoration: none;
    font-size: 0.9rem;
}

.question-card {
    background: white;
    border: 1px solid #ddd;
    border-radius: 12px;
    padding: 25px;
    margin-bottom: 25px;
    box-shadow: var(--shadow);
}

.question-card.correct { border: 2px solid #00b894; background-color: #f0fff4; }
.question-card.incorrect { border: 2px solid #ff7675; background-color: #fff5f5; }

.q-text { font-size: 1.1rem; font-weight: 600; margin-bottom: 15px; }

.user-input {
    width: 100%;
    padding: 10px;
    border: 2px solid #eee;
    border-radius: 8px;
    margin-bottom: 10px;
    font-family: inherit;
    box-sizing: border-box;
}

.reveal-btn, .grade-btn {
    padding: 8px 16px;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: opacity 0.2s;
}

.reveal-btn { background: var(--accent-color); color: white; }
.btn-correct { background: #00b894; color: white; margin-right: 5px; }
.btn-incorrect { background: #ff7675; color: white; }

.hidden { display: none; }