:root {
    --primary-color: #0a58a0;
    --secondary-color: #031e37; /* Darker blue/charcoal */
    --text-color: #484848;
    --light-text-color: #ffffff;
    --border-color: #d9d9d9;
    --input-border-color: #ced4da; /* Slightly darker for input fields */
    --background-color: #f0f2f5;
    --card-background-color: #ffffff;
    --muted-text-color: #777777;
    --error-color: #dc3545;
    --success-color: #155724; /* For success messages text */
    --success-bg-color: #d4edda; /* For success messages background */
    --success-border-color: #c3e6cb; /* For success messages border */
    --error-bg-color: #f8d7da; /* For error messages background */
    --error-border-color: #f5c6cb; /* For error messages border */
    --font-family-sans-serif: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --border-radius: 8px;
    --default-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    --input-focus-border-color: var(--primary-color);
    --input-focus-box-shadow: 0 0 0 0.25rem rgba(10, 88, 160, 0.25); /* Themed primary color */
}

body {
    font-family: var(--font-family-sans-serif);
    background-color: var(--background-color);
    color: var(--text-color);
    margin: 0;
    padding-top: 70px; /* Account for fixed navbar, adjust if navbar height changes */
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: calc(100vh - 70px); /* Full viewport height minus navbar */
    box-sizing: border-box;
}

.signup-container {
    background-color: var(--card-background-color);
    padding: 25px 40px;
    border-radius: var(--border-radius);
    box-shadow: var(--default-shadow);
    width: 100%;
    max-width: 500px; /* Max width of the form container */
    margin: 20px;
    box-sizing: border-box;
}

.signup-container h1 {
    color: var(--secondary-color); /* Using darker theme color for heading */
    text-align: center;
    margin-bottom: 25px;
    font-size: 1.8em;
}

#signup-form .form-group {
    margin-bottom: 18px;
}

#signup-form .form-row {
    display: flex;
    gap: 15px;
    margin-bottom: 18px;
}

#signup-form .form-row .form-group {
    flex: 1;
    margin-bottom: 0; /* Reset margin as it's handled by form-row gap */
}

#signup-form label {
    display: block;
    margin-bottom: 6px;
    font-weight: bold;
    font-size: 0.9em;
    color: var(--muted-text-color);
}

#signup-form input[type="text"],
#signup-form input[type="email"],
#signup-form input[type="tel"],
#signup-form input[type="password"] {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--input-border-color);
    border-radius: var(--border-radius);
    box-sizing: border-box;
    font-size: 1em;
    color: var(--text-color);
}

#signup-form input[type="text"]:focus,
#signup-form input[type="email"]:focus,
#signup-form input[type="tel"]:focus,
#signup-form input[type="password"]:focus {
    border-color: var(--input-focus-border-color);
    outline: none;
    box-shadow: var(--input-focus-box-shadow);
}

.error-message {
    display: block;
    color: var(--error-color);
    font-size: 0.8em;
    margin-top: 4px;
    min-height: 1em; /* Reserve space to prevent layout shifts */
}

.submit-btn {
    width: 100%;
    padding: 12px;
    background-color: var(--primary-color);
    color: var(--light-text-color);
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1.1em;
    transition: background-color 0.3s ease;
}

.submit-btn:hover {
    background-color: var(--secondary-color); /* Darken on hover */
}

.terms, .login-link {
    font-size: 0.85em;
    color: var(--muted-text-color);
    text-align: center;
    margin-top: 15px;
}

.terms a, .login-link a {
    color: var(--primary-color);
    text-decoration: none;
}

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

.message-area {
    padding: 10px;
    margin-top: 15px;
    border-radius: var(--border-radius);
    text-align: center;
}
.message-area.success {
    background-color: var(--success-bg-color);
    color: var(--success-color);
    border: 1px solid var(--success-border-color);
}
.message-area.error {
    background-color: var(--error-bg-color);
    color: var(--error-color); /* Using the general error text color */
    border: 1px solid var(--error-border-color);
}