:root {
    --primary-color: #FFA500; /* オレンジ */
    --text-color: #333;
    --background-color: #FFFFFF;
    --border-color: #ddd;
    --header-footer-bg: #f8f8f8;
}

body {
    font-family: 'Noto Sans JP', sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
}

h1, h2, h3 {
    color: var(--primary-color);
}

a {
    color: var(--primary-color);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

img {
    max-width: 100%;
    height: auto;
}

main {
    padding: 20px;
    max-width: 800px;
    margin: 0 auto;
}

section {
    margin-bottom: 40px;
    padding: 20px;
    background-color: #fff;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

header, footer {
    background-color: var(--header-footer-bg);
    padding: 20px;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

footer {
    border-top: 1px solid var(--border-color);
    border-bottom: none;
    margin-top: 40px;
}

.header-logo {
    max-height: 50px;
    margin-bottom: 10px;
}

/* Profile Section */
.profile-content {
    display: flex;
    align-items: center;
    gap: 20px;
}

.profile-icon {
    width: 100px;
    height: 100px;
    aspect-ratio: 1 / 1; /* Enforce 1:1 aspect ratio */
    border-radius: 50%;
    border: 3px solid var(--primary-color);
    object-fit: cover; /* Ensures the image covers the area without distortion */
}

/* Form Styles */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: bold;
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="url"],
.form-group input[type="datetime-local"],
.form-group textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    box-sizing: border-box; /* Ensures padding doesn't affect width */
}

.form-group textarea {
    resize: vertical;
}

fieldset {
    border: none;
    padding: 0;
    margin: 0;
}

legend {
    padding: 0;
    margin-bottom: 8px;
    font-weight: bold;
    font-size: 1em;
    color: var(--text-color);
}

.checkbox-group {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 10px;
}

.checkbox-item {
    display: flex;
    align-items: center;
}

.checkbox-item input {
    margin-right: 8px;
}

button[type="submit"] {
    display: block;
    width: 100%;
    padding: 15px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.3s;
}

button[type="submit"]:hover {
    background-color: #e69500; /* A slightly darker orange */
}

#form-message {
    margin-top: 20px;
    padding: 10px;
    border-radius: 4px;
    text-align: center;
}

#form-message.success {
    background-color: #d4edda;
    color: #155724;
}

#form-message.error {
    background-color: #f8d7da;
    color: #721c24;
}

.form-group input:invalid {
    border-color: #721c24;
}