/* General Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #f4f4f9;
    color: #333;
    line-height: 1.6;
}

/* Navigation */
.navbar {
    background-color: #2c3e50;
    color: white;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar .logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: #00d2d3;
}

.nav-links {
    list-style: none;
    display: flex;
}

.nav-links li {
    margin-left: 20px;
}

.nav-links a {
    color: white;
    text-decoration: none;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: #00d2d3;
}

/* Main Content Layout */
main {
    max-width: 800px;
    margin: 2rem auto;
    padding: 20px;
    background: white;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    min-height: 400px;
}

/* Visibility Classes (JS Toggles these) */
.hidden-section {
    display: none;
}

.active-section {
    display: block;
    animation: fadeIn 0.5s;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 2rem 0;
}

.hero h1 {
    color: #2c3e50;
    margin-bottom: 10px;
}

.cta-button {
    background-color: #00d2d3;
    color: #2c3e50;
    border: none;
    padding: 10px 20px;
    margin-top: 15px;
    cursor: pointer;
    font-weight: bold;
    border-radius: 4px;
}

.cta-button:hover {
    background-color: #01a3a4;
}

/* Feature Cards */
.features {
    display: flex;
    gap: 20px;
    margin-top: 30px;
}

.card {
    flex: 1;
    background: #ecf0f1;
    padding: 15px;
    border-radius: 5px;
    text-align: center;
}

/* Educational Content Styling */
h2 {
    color: #2c3e50;
    border-bottom: 2px solid #00d2d3;
    padding-bottom: 5px;
    margin-bottom: 20px;
}

.formula-box {
    background-color: #2c3e50;
    color: white;
    padding: 15px;
    text-align: center;
    font-size: 1.5rem;
    margin: 20px 0;
    border-radius: 5px;
}

.interactive-tool {
    border: 1px solid #ddd;
    padding: 20px;
    background-color: #fffdf0;
    border-radius: 5px;
}

input {
    padding: 8px;
    margin: 5px;
    border: 1px solid #ccc;
    border-radius: 4px;
}

/* Quiz Styling */
.quiz-container button {
    display: block;
    width: 100%;
    margin: 10px 0;
    padding: 10px;
    background: #ecf0f1;
    border: 1px solid #ccc;
    cursor: pointer;
    text-align: left;
}

.quiz-container button:hover {
    background: #e0e0e0;
}

footer {
    text-align: center;
    padding: 20px;
    color: #777;
    font-size: 0.9rem;
}