* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: linear-gradient(135deg, #0f111a, #1a1f2a);
    color: #f0f0f0;
}

.auth-card {
    background-color: #1f2535;
    padding: 40px 30px;
    border-radius: 15px;
    width: 350px;
    box-shadow: 0 0 20px rgba(0, 255, 204, 0.3);
    text-align: center;
    position: relative;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.auth-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 255, 204, 0.5);
}

.auth-card h2 {
    color: #00ffcc;
    margin-bottom: 20px;
    font-size: 1.8em;
    letter-spacing: 1px;
}

.auth-card input[type="text"],
.auth-card input[type="email"],
.auth-card input[type="password"] {
    width: 100%;
    padding: 12px;
    margin-bottom: 20px;
    border-radius: 8px;
    border: 1px solid #444;
    background-color: #0f111a;
    color: #f0f0f0;
    font-size: 1em;
    transition: border 0.2s, box-shadow 0.2s;
}

.auth-card input:focus {
    outline: none;
    border-color: #00ffcc;
    box-shadow: 0 0 8px rgba(0, 255, 204, 0.5);
}

.auth-card button {
    width: 100%;
    padding: 12px;
    background-color: #00ffcc;
    color: #0f111a;
    font-weight: bold;
    font-size: 1em;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.2s, box-shadow 0.2s;
}

.auth-card button:hover {
    background-color: #00d1aa;
    box-shadow: 0 0 15px rgba(0, 255, 204, 0.5);
}

.auth-card p {
    margin-top: 15px;
    font-size: 0.9em;
}

.auth-card a {
    color: #00ffcc;
    text-decoration: none;
    transition: color 0.2s;
}

.auth-card a:hover {
    color: #00d1aa;
    text-decoration: underline;
}

.auth-card .error {
    color: #ff4c4c;
    margin-bottom: 15px;
    font-weight: bold;
}

@media (max-width: 400px) {
    .auth-card {
        width: 90%;
        padding: 30px 20px;
    }
}