/* リセットCSS */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ヘッダー */
header {
    text-align: center;
    margin-bottom: 30px;
    color: white;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

header p {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* メインコンテンツ */
main {
    flex: 1;
    background: white;
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    align-items: start;
}

/* 入力セクション */
.input-section {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

label {
    font-weight: 600;
    color: #555;
    font-size: 0.95rem;
}

textarea, input, select {
    padding: 12px;
    border: 2px solid #e1e5e9;
    border-radius: 10px;
    font-size: 1rem;
    transition: all 0.3s ease;
    font-family: inherit;
}

textarea {
    resize: vertical;
    min-height: 100px;
}

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

/* ボタン */
.button-group {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
    justify-content: center;
    min-height: 48px;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

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

.btn-secondary {
    background: #f8f9fa;
    color: #6c757d;
    border: 2px solid #e9ecef;
}

.btn-secondary:hover {
    background: #e9ecef;
    transform: translateY(-1px);
}

.btn-success {
    background: linear-gradient(135deg, #28a745 0%, #20c997 100%);
    color: white;
}

.btn-success:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(40, 167, 69, 0.4);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

/* 出力セクション */
.output-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.qr-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
    padding: 20px;
    border: 2px dashed #e1e5e9;
    border-radius: 15px;
    min-height: 300px;
    justify-content: center;
    width: 100%;
    max-width: 400px;
}

.qr-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
    color: #adb5bd;
    text-align: center;
}

.qr-placeholder svg {
    opacity: 0.5;
}

.qr-placeholder p {
    font-size: 0.95rem;
}

#qrCanvas {
    max-width: 100%;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.title-display {
    font-size: 1.1rem;
    font-weight: 600;
    color: #333;
    text-align: center;
    padding: 10px;
    background: #f8f9fa;
    border-radius: 8px;
    max-width: 100%;
    word-wrap: break-word;
}

.download-section {
    width: 100%;
    max-width: 400px;
}

/* フッター */
footer {
    text-align: center;
    margin-top: 30px;
    color: white;
    opacity: 0.8;
}

/* ローディング状態 */
.loading {
    position: relative;
    overflow: hidden;
}

.loading::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
    animation: loading 1.5s infinite;
}

@keyframes loading {
    0% { left: -100%; }
    100% { left: 100%; }
}

/* レスポンシブデザイン */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    main {
        grid-template-columns: 1fr;
        gap: 25px;
        padding: 20px;
    }
    
    .button-group {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
    
    .qr-container {
        min-height: 250px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 10px;
    }
    
    header h1 {
        font-size: 1.8rem;
    }
    
    main {
        padding: 15px;
    }
    
    textarea {
        min-height: 80px;
    }
}

/* アニメーション */
.fade-in {
    animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.scale-in {
    animation: scaleIn 0.3s ease-out;
}

@keyframes scaleIn {
    from { transform: scale(0.8); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

/* アクセシビリティ */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* フォーカス表示の改善 */
.btn:focus-visible, 
textarea:focus-visible, 
input:focus-visible, 
select:focus-visible {
    outline: 2px solid #667eea;
    outline-offset: 2px;
}