* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #e8f5e9; 
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 40px 20px; 
}


.signup-container {
    background-color: #ffffff;

    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.12); 
    width: 100%;

    max-width: 550px;
}


h1 {
    text-align: center;
    color: #2e7d32; 
    margin-bottom: 30px; 
    font-size: 2em; 
}

.form-group {
    margin-bottom: 22px; 
    position: relative;
}

/* Labels */
label {
    display: block;
    margin-bottom: 8px;
    color: #333;
    font-weight: 600;
    font-size: 0.95em;
}


input[type="text"],
input[type="email"],
input[type="password"] {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #a5d6a7; /* Light green border */
    border-radius: 6px;
    font-size: 1em;
    transition: border-color 0.3s ease, box-shadow 0.3s ease; /* Added box-shadow transition */
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="password"]:focus {
    outline: none;
    border-color: #4caf50; /* Medium Green on focus */
    box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.25); /* Slightly stronger focus ring */
}

/* Password Toggle Icon */
.password-group {
    position: relative;
}

.toggle-password {
    position: absolute;
    right: 15px;
    /* Vertically center relative to the input field height */
    top: 0;
    bottom: 0;
    height: 100%;
    display: flex;
    align-items: center;
    /* Removed transform as direct centering works better with height: 100% */
    cursor: pointer;
    color: #888;
    z-index: 2;
     /* Adjust positioning slightly if label is present */
    margin-top: 28px; /* Approximate height of the label + margin */
}
/* Adjust toggle position if there's no label or label position changes */
label + .toggle-password {
     margin-top: 0; /* Reset if directly after input (less common setup) */
     top: 50%;
     transform: translateY(-50%);
     height: auto; /* Reset height if using transform */
}
/* More robust way to position relative to input: position inside input's parent */
.form-group input[type="password"] + .toggle-password {
     top: auto; /* Let bottom/height control */
     bottom: 0;
     height: 45px; /* Approx height of input + padding */
     margin-top: 0;
     transform: none;
}


.toggle-password i {
    font-size: 1.1em;
}

/* Submit Button */
button[type="submit"] {
    width: 100%;
    padding: 14px 15px; /* Slightly larger button */
    background-color: #4caf50; /* Medium Green */
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 1.1em;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.3s ease;
    margin-top: 15px;
}

button[type="submit"]:hover {
    background-color: #388e3c; /* Darker Green on hover */
}

/* Error Message Styling */
.error-message {
    color: #d32f2f;
    background-color: #ffebee;
    border: 1px solid #ef9a9a;
    border-radius: 5px;
    padding: 12px; /* Slightly more padding */
    margin-bottom: 20px;
    font-size: 0.9em;
    text-align: center;
    display: none;
}

.error-message.show {
    display: block;
}

/* Login Link */
.login-link {
    text-align: center;
    margin-top: 25px; /* More space */
    font-size: 0.95em; /* Slightly larger */
    color: #555;
}

.login-link a {
    color: #2e7d32;
    text-decoration: none;
    font-weight: 600;
}

.login-link a:hover {
    text-decoration: underline;
}

/* Responsive Design Adjustments (Primarily for smaller screens) */
@media (max-width: 600px) {
     /* Reduce body padding on smaller screens */
    body {
         padding: 20px 15px;
    }
    .signup-container {
        /* Reduce padding inside container */
        padding: 30px 25px;
    }
    h1 {
        font-size: 1.7em; /* Adjust heading size */
        margin-bottom: 25px;
    }
    .form-group {
        margin-bottom: 18px;
    }
     button[type="submit"] {
         padding: 12px 15px;
     }
     .login-link {
         margin-top: 20px;
     }
      /* Adjust toggle password position slightly if needed for smaller inputs */
     .form-group input[type="password"] + .toggle-password {
          height: 42px; /* Adjust if input padding changes */
     }
}

 @media (max-width: 400px) {
     h1 {
         font-size: 1.5em;
     }
      .signup-container {
        padding: 25px 20px;
    }
     label {
         font-size: 0.9em;
     }
     input[type="text"],
     input[type="email"],
     input[type="password"] {
         padding: 10px 12px;
         font-size: 0.95em;
     }
      .form-group input[type="password"] + .toggle-password {
          height: 40px; /* Adjust if input padding changes */
     }
 }