body {
    font-family: Arial, sans-serif;
    background: linear-gradient(135deg, #667eea, #764ba2);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.container {
    background: white;
    padding: 30px;
    border-radius: 15px;
    width: 300px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0,1);
    text-align: center;
}

input {
    width: 100%;
    padding: 10px;
    margin: 8px 0;
    border-radius: 8px;
    border: 1px solid #ccc;
}

button {
    width: 100%;
    padding: 10px;
    border: none;
    border-radius: 8px;
    background: #4caf50;
    color: white;
    cursor: pointer;
    margin-top: 5px;
}

#signup-error,
#login-error {
    color: red;
    font-size: 14px;
    margin-top: 8px;
    min-height: 20px;
}

body.dark {
    background: linear-gradient(135deg, #1f2937, #111827);
}

body.dark .container {
    background: #1f1f1f;
    color: white;
}

body.dark input {
    background: #2c2c2c;
    color: white;
    border: 1px solid #555;
}

body.dark button {
    opacity: 0.95;
}

#theme-toggle {
    margin-bottom: 15px;
    background: #333;
}

body.dark #theme-toggle {
    background: #fbbf24;
    color: black;
}