/* Reset */
body, html {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, sans-serif;
    background: linear-gradient(135deg, #1c1c1c, #1c1c1c);
    color: #f2f2f2;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}

.container {
    text-align: center;
}

.header {
    margin-bottom: 40px;
}

.logo {
    width: 150px;
    margin-bottom: 20px;
}

h1 {
    font-size: 2.5em;
    font-weight: 700;
    color: #ffffff;
}

.subheader {
    font-size: 1.2em;
    color: #bbbbbb;
}

/* Card Container */
.card-container {
    perspective: 1000px;
}

.card {
    width: 300px;
    height: 400px;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.8s ease-in-out;
}

.card:hover {
    transform: rotateY(180deg);
}

.card-front, .card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.4);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.card-front {
    background: linear-gradient(135deg, #1c1c1c, #3a3a3a);
}

.card-front h2 {
    font-size: 1.8em;
    margin-bottom: 10px;
}

.card-back {
    background: linear-gradient(135deg, #1c1c1c, #3a3a3a);
    transform: rotateY(180deg);
}

.card-back h2 {
    margin-bottom: 15px;
    color: #ffffff;
}

form {
    display: flex;
    flex-direction: column;
    width: 100%;
}

label {
    margin-bottom: 5px;
    font-size: 0.9em;
    color: #cccccc;
}

input {
    margin-bottom: 15px;
    padding: 10px;
    font-size: 1em;
    border: none;
    border-radius: 5px;
    background: #3d3d3d;
    color: #ffffff;
}

button {
    padding: 10px;
    font-size: 1em;
    border: none;
    border-radius: 5px;
    background: #555555;
    color: #ffffff;
    cursor: pointer;
    transition: background 0.3s ease;
}

button:hover {
    background: #777777;
}