* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: Arial, sans-serif;
    background: #f5f7fb;
    color: #172033;
}

header {
    background: #101a3a;
    color: white;
    padding: 30px 20px;
    text-align: center;
}

header h1 {
    font-size: 32px;
    margin-bottom: 8px;
}

header p {
    color: #b8c7ff;
}

main {
    max-width: 1100px;
    margin: 40px auto;
    padding: 0 20px;
}

main h2 {
    font-size: 28px;
    margin-bottom: 10px;
}

main > p {
    color: #68738a;
    margin-bottom: 30px;
}

.cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.card {
    background: white;
    padding: 25px;
    border-radius: 18px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
}

.card h3 {
    font-size: 20px;
    margin-bottom: 12px;
}

.card p {
    color: #68738a;
    margin-bottom: 20px;
}

button {
    border: none;
    background: #4169e1;
    color: white;
    padding: 12px 18px;
    border-radius: 10px;
    font-size: 15px;
    cursor: pointer;
}

button:active {
    transform: scale(0.97);
}

@media (max-width: 600px) {
    .cards {
        grid-template-columns: 1fr;
    }

    main {
        margin-top: 25px;
    }.tutor-page {
    display: none;
    max-width: 900px;
    margin: 30px auto;
    padding: 20px;
}

.tutor-header {
    background: #101a3a;
    color: white;
    padding: 25px;
    border-radius: 18px;
    margin-bottom: 20px;
}

.tutor-header p {
    color: #b8c7ff;
    margin-top: 8px;
}

.chat-box {
    background: white;
    min-height: 400px;
    padding: 20px;
    border-radius: 18px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.08);
    margin-bottom: 15px;
}

.ai-message {
    background: #eef2ff;
    padding: 15px;
    border-radius: 14px;
    max-width: 80%;
}

.user-message {
    background: #4169e1;
    color: white;
    padding: 15px;
    border-radius: 14px;
    max-width: 80%;
    margin: 12px 0 12px auto;
}

.chat-input {
    display: flex;
    gap: 10px;
}

.chat-input input {
    flex: 1;
    padding: 15px;
    border: 1px solid #ddd;
    border-radius: 12px;
    font-size: 16px;
}

.back-button {
    margin-top: 15px;
    background: #101a3a;
}

@media (max-width: 600px) {
    .tutor-page {
        margin: 15px auto;
        padding: 15px;
    }

    .chat-box {
        min-height: 350px;
    }
}