* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
}

body {
    background: #f9f9f9;
    color: #333;
}

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

/* Header */
header {
    background: #fff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 20px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    margin-bottom: 20px;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: #2f559c;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 30px;
}

nav ul li a {
    text-decoration: none;
    color: #2f559c;
    font-weight: 600;
    transition: color 0.3s ease;
}

nav ul li a:hover {
    color: #9e8f3e;
}

/* Main */
main {
    margin: 20px 10px 10px;
    padding: 20px 20px 10px;
    min-height: calc(100vh - 200px);
}

.hero {
    position: relative;
    padding: 4rem 2rem;
    text-align: center;
    background: linear-gradient(135deg, #2f559c, #9e8f3e);
    color: #fff;
    border-radius: 10px;
    overflow: hidden;
    margin: 0 auto;
    max-width: 1200px;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 0;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 20px;
    z-index: 1;
    position: relative;
}

.hero p {
    font-size: 1.5rem;
    margin-bottom: 30px;
    z-index: 1;
    position: relative;
}

.cta-button {
    background: #2f559c;
    color: #fff;
    padding: 15px 30px;
    text-decoration: none;
    border-radius: 5px;
    font-weight: 600;
    transition: background 0.3s ease, transform 0.3s ease;
    border: none;
    cursor: pointer;
    display: inline-block;
    font-size: 1.1rem;
}

.cta-button:hover {
    background: #9e8f3e;
    transform: scale(1.05);
}

.quiz-button {
    background: #28a745;
    color: #fff;
    padding: 15px 30px;
    text-decoration: none;
    border-radius: 5px;
    font-weight: 600;
    transition: background 0.3s ease, transform 0.3s ease;
    border: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    font-size: 1.1rem;
}

.quiz-button i {
    margin-right: 8px;
}

.quiz-button:hover {
    background: #218838;
    transform: scale(1.05);
}

/* Auth Forms */
.auth-form {
    max-width: 500px;
    margin: 2rem auto;
    background: #fff;
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    text-align: center;
}

.auth-form h2 {
    font-size: 2.5rem;
    color: #2f559c;
    margin-bottom: 30px;
}

.error {
    color: #e74c3c;
    font-size: 0.9rem;
    margin-bottom: 20px;
}

.form-group {
    margin-bottom: 20px;
    text-align: left;
}

.form-group label {
    display: block;
    font-size: 1.1rem;
    color: #2f559c;
    margin-bottom: 8px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: #2f559c;
    outline: none;
}

.form-group textarea {
    min-height: 100px;
}

/* Dashboard */
.dashboard {
    max-width: 1200px;
    margin: 0 auto;
    padding: 80px 20px;
}

.dashboard h2 {
    font-size: 2.5rem;
    color: #2f559c;
    text-align: center;
    margin-bottom: 30px;
}

.dashboard h3 {
    font-size: 2rem;
    color: #2f559c;
    text-align: center;
    margin-bottom: 50px;
    background: #fff;
    padding: 15px 30px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.course-sections {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 40px;
    padding: 0 20px;
}

.section-card {
    background: #fff;
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.15);
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border-left: 5px solid #2f559c;
}

.section-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
}

.section-card h4 {
    font-size: 1.6rem;
    color: #2f559c;
    margin-bottom: 15px;
}

.section-card p {
    font-size: 1rem;
    color: #555;
    margin-bottom: 20px;
}

.section-card .quiz-available {
    display: inline-block;
    background: #e9f5ec;
    color: #28a745;
    padding: 8px 15px;
    border-radius: 15px;
    font-size: 0.9rem;
    margin: 10px 0;
}

.section-card .quiz-available i {
    margin-right: 5px;
}

.section-card .cta-button {
    width: 100%;
    max-width: 200px;
    margin: 0 auto;
}

.section-card .completion-status {
    font-size: 0.9rem;
    color: #28a745;
    margin-top: 10px;
}

.section-card .completion-status i {
    margin-right: 5px;
}

/* Course Content */
.course-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 80px 20px;
}

.course-content .go-back {
    display: inline-flex;
    align-items: center;
    color: #2f559c;
    text-decoration: none;
    font-weight: 600;
    margin-bottom: 20px;
    transition: color 0.3s ease;
}

.course-content .go-back i {
    margin-right: 8px;
}

.course-content .go-back:hover {
    color: #9e8f3e;
}

.course-content h2 {
    font-size: 2.5rem;
    color: #2f559c;
    margin-bottom: 20px;
}

.course-content h3 {
    font-size: 1.8rem;
    color: #2f559c;
    margin-bottom: 20px;
}

.course-content video {
    width: 100%;
    border-radius: 10px;
    margin: 20px 0;
}

.course-content .button-group {
    display: flex;
    gap: 20px;
    justify-content: center;
    align-items: center; /* Vertically center align */
    margin-top: 20px;
}

.course-content .completion-status {
    background: #e9f5ec;
    color: #28a745;
    padding: 15px 25px;
    border-radius: 20px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    margin: 0;
}

.course-content .completion-status i {
    margin-right: 8px;
}

/* Quiz */
.quiz {
    max-width: 600px;
    margin: 0 auto;
    padding: 80px 20px;
}

.quiz .go-back {
    display: inline-flex;
    align-items: center;
    color: #2f559c;
    text-decoration: none;
    font-weight: 600;
    margin-bottom: 20px;
    transition: color 0.3s ease;
}

.quiz .go-back i {
    margin-right: 8px;
}

.quiz .go-back:hover {
    color: #9e8f3e;
}

.quiz h2 {
    font-size: 2.5rem;
    color: #2f559c;
    margin-bottom: 30px;
}

/* Payment */
.payment {
    max-width: 600px;
    margin: 2rem auto;
    padding: 40px;
    background: #fff;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.payment-card {
    background: #f9f9f9;
    padding: 20px;
    border-radius: 10px;
    margin-bottom: 20px;
    width: 100%;
    max-width: 400px;
}

.payment h2 {
    font-size: 2.5rem;
    color: #2f559c;
    margin-bottom: 20px;
}

.payment .price-box {
    background: #e9f5ec;
    padding: 15px;
    border-radius: 10px;
    margin-bottom: 30px;
    font-size: 1.8rem;
    color: #28a745;
    font-weight: 700;
}

.payment p {
    font-size: 1.2rem;
    color: #555;
    margin-bottom: 20px;
}

#card-element {
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 5px;
    margin-bottom: 20px;
    width: 100%;
}

#card-errors {
    color: #e74c3c;
    font-size: 0.9rem;
    margin-bottom: 20px;
}

/* Footer */
footer {
    background: #2f559c;
    color: #fff;
    padding: 50px 20px 20px;
    text-align: center;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Responsive Design */
@media (max-width: 768px) {
    header {
        padding: 10px 0;
    }

    nav {
        flex-direction: column;
        align-items: flex-start;
        padding: 0 10px;
    }

    nav ul {
        flex-direction: column;
        gap: 20px;
        padding: 20px 0;
        width: 100%;
    }

    nav ul li a {
        font-size: 1.2rem;
    }

    main {
        margin: 20px 10px 10px;
        padding: 20px 20px 10px;
    }

    .hero {
        padding: 2rem 1rem;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero p {
        font-size: 1rem;
    }

    .auth-form, .payment {
        padding: 30px;
        margin: 1rem;
    }

    .dashboard, .course-content, .quiz {
        padding: 40px 10px;
    }

    .course-sections {
        padding: 0 10px;
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    }

    .section-card {
        padding: 20px;
    }

    .course-content .button-group {
        flex-direction: column;
        gap: 15px;
    }

    .payment {
        max-width: 100%;
        padding: 20px;
    }

    .payment-card {
        max-width: 100%;
    }
}