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

body {
    font-family: 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
    padding: 60px 20px;
    border-radius: 15px;
    margin-bottom: 40px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    font-weight: 300;
}

header p {
    font-size: 1.2rem;
    opacity: 0.9;
}

main {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.donation-form {
    background: white;
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
}

.donation-form h2 {
    color: #667eea;
    margin-bottom: 30px;
    font-size: 1.8rem;
    font-weight: 400;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #555;
}

.required {
    color: #e74c3c;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #e1e8ed;
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s ease;
    font-family: inherit;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.help-text {
    display: block;
    margin-top: 5px;
    font-size: 14px;
    color: #777;
}

.submit-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 15px 30px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    width: 100%;
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

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

.donation-info {
    background: white;
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
}

.donation-info h2 {
    color: #667eea;
    margin-bottom: 30px;
    font-size: 1.8rem;
    font-weight: 400;
}

.info-section {
    margin-bottom: 30px;
}

.info-section h3 {
    color: #555;
    margin-bottom: 15px;
    font-size: 1.3rem;
    font-weight: 500;
}

.info-section ol,
.info-section ul {
    padding-left: 25px;
}

.info-section li {
    margin-bottom: 8px;
    color: #666;
}

.success-message {
    background: #d4edda;
    color: #155724;
    padding: 20px;
    border-radius: 8px;
    border: 1px solid #c3e6cb;
    margin-top: 20px;
}

.error-message {
    background: #f8d7da;
    color: #721c24;
    padding: 20px;
    border-radius: 8px;
    border: 1px solid #f5c6cb;
    margin-top: 20px;
}

footer {
    text-align: center;
    padding: 30px;
    color: #777;
    border-top: 1px solid #e1e8ed;
}

/* レスポンシブデザイン */
@media (max-width: 768px) {
    main {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .donation-form,
    .donation-info {
        padding: 30px 20px;
    }
    
    .container {
        padding: 10px;
    }
}

@media (max-width: 480px) {
    header {
        padding: 40px 15px;
    }
    
    header h1 {
        font-size: 1.8rem;
    }
    
    header p {
        font-size: 1rem;
    }
    
    .donation-form,
    .donation-info {
        padding: 20px 15px;
    }
}

/* アニメーション */
.donation-form,
.donation-info {
    animation: slideUp 0.6s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ローディング状態 */
.submit-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.submit-btn:disabled:hover {
    transform: none;
    box-shadow: none;
}