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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.container {
    background: white;
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    padding: 40px;
    max-width: 700px;
    width: 100%;
}

h1 {
    color: #333;
    margin-bottom: 30px;
    text-align: center;
    font-size: 28px;
    font-weight: 600;
}

.form-group {
    margin-bottom: 25px;
}

label {
    display: block;
    margin-bottom: 8px;
    color: #555;
    font-weight: 500;
    font-size: 14px;
}

.required {
    color: #e74c3c;
    margin-left: 3px;
}

input[type="text"],
input[type="email"],
input[type="tel"],
input[type="number"],
input[type="date"],
select {
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
    height: 48px;
    padding: 10px 15px; /* Adjust padding slightly to accommodate fixed height */
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 15px;
    font-family: inherit;
    transition: all 0.3s ease;
    background-color: #fff;
}

input[type="date"] {
    -webkit-appearance: none;
    appearance: none;
    min-width: 0;
    width: 100%;
    max-width: 100%;
    overflow: hidden;
    display: block;
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="tel"]:focus,
input[type="number"]:focus,
input[type="date"]:focus,
select:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.count-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-top: 10px;
}

.count-item label {
    margin-bottom: 8px;
}

.hint {
    margin-top: 10px;
    color: #6c757d;
    font-size: 13px;
}

.participant-form {
    background: #f8f9fa;
    border: 2px solid #e9ecef;
    border-radius: 10px;
    padding: 25px;
    margin-bottom: 20px;
    position: relative;
    transition: all 0.3s ease;
}

.participant-form .form-group:last-child {
    margin-bottom: 0;
}

.confirm-label {
    display: inline-block;
    width: 3.5em; /* 3.5文字分くらいの幅を確保してコロンの位置を揃える */
}

.participant-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 2px solid #dee2e6;
}

.participant-header h3 {
    color: #495057;
    font-size: 18px;
    font-weight: 600;
}

.remove-btn {
    background: #dc3545;
    color: white;
    border: none;
    border-radius: 6px;
    padding: 8px 16px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 5px;
}

.remove-btn:hover {
    background: #c82333;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(220, 53, 69, 0.3);
}

.add-btn-container {
    margin: 25px 0;
    text-align: center;
}

.btn-add {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    padding: 12px 30px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.btn-add:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.btn-add:active {
    transform: translateY(0);
}

.plus-icon {
    font-size: 20px;
    font-weight: bold;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    padding: 15px;
    background: #fff3cd;
    border: 2px solid #ffc107;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.checkbox-label:hover {
    background: #ffeaa7;
    border-color: #ffb300;
}

.checkbox-label input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: #ffc107;
}

.btn-submit {
    width: 100%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    padding: 15px;
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
    margin-top: 10px;
}

.btn-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.btn-submit:active {
    transform: translateY(0);
}

/* アニメーション */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.participant-form {
    animation: fadeIn 0.3s ease;
}

/* レスポンシブデザイン */
@media (max-width: 768px) {
    .container {
        padding: 25px;
    }

    h1 {
        font-size: 24px;
    }

    .participant-form {
        padding: 20px;
    }

    .count-grid {
        grid-template-columns: 1fr;
    }
}