* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: sans-serif;
}
body {
    background-color: #f4f3ef;
    display: flex;
    justify-content: center;
    height: 100vh;
}
.app-container {
    width: 100%;
    max-width: 480px;
    background-color: #faf9f6;
    display: flex;
    flex-direction: column;
    box-shadow: 0 4px 12px rgba(0,0,0,0.03);
}
.app-header {
    background-color: #e6e5df;
    padding: 16px;
    display: flex;
    align-items: center;
    border-bottom: 1px solid #dcdad2;
}
.avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background-color: #d2d8ce;
    margin-right: 16px;
    object-fit: cover;
}
h1 {
    color: #63615c;
    font-size: 1.2rem;
    font-weight: normal;
}
.chat-container {
    flex: 1;
    padding: 16px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.message {
    max-width: 80%;
    padding: 12px 16px;
    border-radius: 16px;
    font-size: 0.95rem;
    line-height: 1.4;
    color: #52504c;
}
.tutor-message {
    background-color: #e4e7e9;
    align-self: flex-start;
    border-bottom-left-radius: 4px;
}
.user-message {
    background-color: #e8e3dc;
    align-self: flex-end;
    border-bottom-right-radius: 4px;
}
.input-area {
    padding: 16px;
    background-color: #e6e5df;
    display: flex;
    gap: 8px;
    border-top: 1px solid #dcdad2;
}
input {
    flex: 1;
    padding: 12px;
    border: 1px solid #dcdad2;
    border-radius: 24px;
    background-color: #faf9f6;
    color: #52504c;
    outline: none;
}
button {
    padding: 0 20px;
    background-color: #cad1cc;
    color: #52504c;
    border: none;
    border-radius: 24px;
    cursor: pointer;
    font-weight: bold;
}