body {
    font-family: Arial, sans-serif;
    background: #f4f6f8;
    margin: 0;
    padding: 0;
}

.container {
    max-width: 700px;
    margin: 60px auto;
    padding: 20px;
}

h1 {
    text-align: center;
    margin-bottom: 10px;
}

.subtitle {
    text-align: center;
    color: #666;
    margin-bottom: 30px;
}

.card {
    background: white;
    border-radius: 12px;
    padding: 25px;
    box-shadow: 0 4px 14px rgba(0,0,0,0.08);
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: bold;
}

input {
    width: 100%;
    padding: 12px;
    font-size: 18px;
    box-sizing: border-box;
    margin-bottom: 15px;
}

button {
    width: 100%;
    padding: 12px;
    font-size: 16px;
    cursor: pointer;
    margin-top: 10px;
}

.message {
    margin-top: 15px;
    font-weight: bold;
}

.session-box {
    margin-top: 25px;
    padding: 15px;
    background: #f9fafb;
    border: 1px solid #ddd;
    border-radius: 10px;
}

.hidden {
    display: none;
}

.button-row {
    display: flex;
    gap: 10px;
    margin-top: 20px;
}

.button-row button {
    width: 100%;
}

.danger {
    background: #b91c1c;
    color: white;
    border: none;
}

.secondary {
    background: #e5e7eb;
    color: #111827;
    border: none;
}