:root {
    --primary-color: #6a5acd; /* SlateBlue */
    --secondary-color: #f0e6ff; /* Lavender */
    --background-color: #f8f9fa; /* Light Gray */
    --text-color: #343a40; /* Dark Gray */
    --card-background: #ffffff;
    --border-color: #e9ecef;
    --success-bg: #d4edda;
    --success-text: #155724;
    --error-bg: #f8d7da;
    --error-text: #721c24;
}

body.dark-mode {
    --primary-color: #7b68ee; /* MediumSlateBlue */
    --secondary-color: #483d8b; /* DarkSlateBlue */
    --background-color: #121212;
    --text-color: #e0e0e0;
    --card-background: #1e1e1e;
    --border-color: #333333;
    --accent-border-color: #4CAF50; /* Subtle green for dark mode */
    --success-bg: #2a4b37;
    --success-text: #a7e0b4;
    --error-bg: #5a2d32;
    --error-text: #f5c6cb;
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color 0.3s, color 0.3s;
}

#themeToggle {
    position: fixed;
    top: 20px;
    right: 20px;
    background-color: var(--card-background);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 45px;
    height: 45px;
    font-size: 1.2rem;
    cursor: pointer;
    z-index: 1000;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    transition: background-color 0.3s, color 0.3s, transform 0.2s;
}

#themeToggle:hover {
    transform: scale(1.1);
}

.container {
    background-color: var(--card-background);
    padding: 40px 50px;
    border-radius: 12px;
    /* Updated border for container */
    border: 1px solid var(--border-color);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 500px;
    text-align: center;
    transform: translateY(-10px);
    transition: transform 0.3s ease, box-shadow 0.3s ease, background-color 0.3s, border-color 0.3s;
}

.container:hover {
    transform: translateY(-15px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

body.dark-mode .container {
    border: 1px solid var(--accent-border-color);
}

h1 {
    color: var(--text-color);
    margin-bottom: 25px;
    font-weight: 600;
}

.form-group {
    margin-bottom: 20px;
    text-align: left;
    position: relative;
}

label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-color);
    font-weight: 600;
    font-size: 0.9rem;
}

input[type="text"],
input[type="email"],
textarea {
    width: 100%;
    padding: 12px 15px;
    /* Updated border for inputs */
    border: 2px solid var(--border-color);
    background-color: var(--background-color);
    color: var(--text-color);
    border-radius: 8px;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
    font-size: 1rem;
    transition: border-color 0.3s ease, box-shadow 0.3s ease, background-color 0.3s;
}

body.dark-mode input[type="text"],
body.dark-mode input[type="email"],
body.dark-mode textarea {
    border: 2px solid var(--accent-border-color);
}

input[type="text"]:focus,
input[type="email"]:focus,
textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--secondary-color);
}

textarea {
    resize: vertical;
    min-height: 120px;
}

button[type="submit"] {
    background: linear-gradient(45deg, var(--primary-color), #8372d6);
    color: #ffffff;
    padding: 15px 25px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    width: 100%;
    margin-top: 10px;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

button[type="submit"]:hover {
    box-shadow: 0 5px 15px rgba(106, 90, 205, 0.4);
    transform: translateY(-3px);
}

button[type="submit"]:active {
    transform: translateY(-1px);
    box-shadow: 0 2px 10px rgba(106, 90, 205, 0.4);
}

#formStatus {
    margin-top: 20px;
    padding: 12px;
    border-radius: 8px;
    font-size: 0.95rem;
    opacity: 0;
    transition: opacity 0.5s ease, background-color 0.3s, color 0.3s;
}

#formStatus:not(.hidden) {
    opacity: 1;
}

#formStatus.success {
    background-color: var(--success-bg);
    color: var(--success-text);
}

#formStatus.error {
    background-color: var(--error-bg);
    color: var(--error-text);
}

.hidden {
    display: none;
}