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

/* 基本設定 */
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Hiragino Sans', 'Hiragino Kaku Gothic ProN', Meiryo, sans-serif;
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 50%, #f0fdf4 100%);
    min-height: 100vh;
    color: #1f2937;
    line-height: 1.6;
    font-weight: 400;
}

.container {
    max-width: 480px;
    margin: 0 auto;
    background: #ffffff;
    min-height: 100vh;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    position: relative;
    border-radius: 0;
    overflow: hidden;
}

/* 画面切り替え */
.screen {
    display: none;
    padding: 20px;
    min-height: 100vh;
}

.screen.active {
    display: block;
}

/* ヘッダー */
.header {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 32px 20px;
    background: linear-gradient(135deg, #10b981 0%, #059669 50%, #047857 100%);
    color: white;
    margin: 0;
    position: relative;
    overflow: hidden;
    border-radius: 0;
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.9) 0%, rgba(5, 150, 105, 0.9) 50%, rgba(4, 120, 87, 0.9) 100%);
    backdrop-filter: blur(10px);
}

.app-title {
    font-family: 'Hiragino Maru Gothic ProN', 'Yu Gothic UI', 'Meiryo UI', sans-serif;
    font-size: 36px;
    font-weight: 700;
    position: relative;
    z-index: 1;
    letter-spacing: 2px;
    flex: 1;
    text-align: center;
    color: white;
    text-shadow: 
        0 2px 4px rgba(0, 0, 0, 0.3),
        0 4px 8px rgba(0, 0, 0, 0.2),
        0 0 20px rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
}

.app-title::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at center, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
    border-radius: 50px;
    z-index: -1;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.app-title:hover::before {
    opacity: 1;
}

.app-title:hover {
    transform: scale(1.05);
    text-shadow: 
        0 2px 8px rgba(0, 0, 0, 0.4),
        0 4px 16px rgba(0, 0, 0, 0.3),
        0 0 30px rgba(255, 255, 255, 0.2);
}

/* 設定ボタン */
.settings-btn {
    position: absolute;
    top: 50%;
    right: 20px;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.2);
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 12px;
    width: 44px;
    height: 44px;
    font-size: 18px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 2;
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.settings-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-50%) scale(1.05);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.settings-btn:active {
    transform: translateY(-50%) scale(0.95);
}

/* サブヘッダー */
.sub-header {
    display: flex;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 2px solid #f0f0f0;
}

.back-btn {
    background: none;
    border: none;
    font-size: 18px;
    color: #666;
    cursor: pointer;
    padding: 5px 10px;
    margin-right: 15px;
    border-radius: 5px;
    transition: background-color 0.3s;
}

.back-btn:hover {
    background: #f0f0f0;
}

.sub-header h2 {
    color: #333;
    font-size: 20px;
}

/* セクション */
section {
    margin-bottom: 32px;
}

section h2 {
    color: #065f46;
    margin-bottom: 18px;
    font-size: 20px;
    font-weight: 600;
    letter-spacing: 0.3px;
}

/* 難易度選択 */
.difficulty-buttons {
    display: flex;
    gap: 12px;
    justify-content: center;
}

/* 難易度選択メッセージ */
.difficulty-message {
    text-align: center;
    padding: 40px 20px;
    background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
    border-radius: 20px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.06);
    border: 1px solid rgba(226, 232, 240, 0.8);
    margin-bottom: 32px;
}

.difficulty-message h2 {
    color: #065f46;
    margin-bottom: 16px;
    font-size: 20px;
    font-weight: 600;
}

.message-text {
    color: #64748b;
    font-size: 16px;
    line-height: 1.5;
    margin: 0;
}

.difficulty-btn {
    flex: 1;
    padding: 14px 20px;
    border: 2px solid #e2e8f0;
    background: #ffffff;
    border-radius: 16px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    color: #64748b;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.04);
    position: relative;
    overflow: hidden;
}

.difficulty-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    transition: left 0.5s;
}

.difficulty-btn:hover::before {
    left: 100%;
}

.difficulty-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
    border-color: #cbd5e1;
}

.difficulty-btn.active {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    border-color: #10b981;
    color: white;
    box-shadow: 0 8px 25px rgba(16, 185, 129, 0.3);
}

/* ミッションカード */
.mission-card {
    background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
    border-radius: 20px;
    padding: 32px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08);
    border: 1px solid rgba(226, 232, 240, 0.8);
    text-align: center;
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
}

.mission-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #10b981, #059669);
}


.mission-difficulty {
    display: inline-block;
    background: rgba(16, 185, 129, 0.1);
    color: #059669;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 18px;
    position: relative;
    z-index: 1;
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.mission-text {
    font-size: 22px;
    font-weight: 700;
    color: #065f46;
    margin-bottom: 24px;
    line-height: 1.4;
    position: relative;
    z-index: 1;
}

.complete-btn {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: white;
    border: none;
    padding: 16px 32px;
    border-radius: 16px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    box-shadow: 0 8px 25px rgba(16, 185, 129, 0.3);
    z-index: 1;
}

.complete-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.5s;
    z-index: -1;
}

.complete-btn:hover::before {
    left: 100%;
}

.complete-btn:hover {
    background: linear-gradient(135deg, #059669 0%, #047857 100%);
    transform: translateY(-3px);
    box-shadow: 0 12px 35px rgba(16, 185, 129, 0.4);
}

.complete-btn.completed {
    background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
    box-shadow: 0 8px 25px rgba(59, 130, 246, 0.3);
}

.complete-btn.completed:hover {
    background: linear-gradient(135deg, #1d4ed8 0%, #1e40af 100%);
    box-shadow: 0 12px 35px rgba(59, 130, 246, 0.4);
}

.complete-check {
    display: none;
}

.complete-btn.completed .complete-text {
    display: none;
}

.complete-btn.completed .complete-check {
    display: inline;
}

/* 統計表示 */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.stat-item {
    text-align: center;
    background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
    padding: 24px 16px;
    border-radius: 16px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.06);
    border: 1px solid rgba(226, 232, 240, 0.8);
    position: relative;
    overflow: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.stat-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, #10b981, #059669);
}

.stat-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 35px rgba(0, 0, 0, 0.1);
}

.stat-number {
    font-size: 28px;
    font-weight: 700;
    color: #10b981;
    margin-bottom: 8px;
    background: linear-gradient(135deg, #10b981, #059669);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 13px;
    color: #64748b;
    font-weight: 500;
    letter-spacing: 0.3px;
}

/* ナビゲーションボタン */
.nav-buttons {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-top: 32px;
}

.nav-btn {
    padding: 18px 24px;
    background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
    border: 2px solid rgba(226, 232, 240, 0.8);
    border-radius: 16px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    color: #64748b;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.04);
    position: relative;
    overflow: hidden;
}

.nav-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(16, 185, 129, 0.1), transparent);
    transition: left 0.5s;
}

.nav-btn:hover::before {
    left: 100%;
}

.nav-btn:hover {
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
    border-color: #cbd5e1;
    color: #475569;
}

/* 履歴画面 */
.history-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.history-item {
    background: white;
    padding: 15px;
    border-radius: 10px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    border: 1px solid #f0f0f0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.history-info {
    flex: 1;
}

.history-date {
    font-size: 14px;
    color: #666;
    margin-bottom: 5px;
}

.history-mission {
    font-size: 16px;
    font-weight: bold;
    color: #333;
}

.history-status {
    padding: 6px 12px;
    border-radius: 15px;
    font-size: 12px;
    font-weight: bold;
}

.history-status.completed {
    background: #e8f5e8;
    color: #4CAF50;
}

.history-status.pending {
    background: #fff3cd;
    color: #856404;
}

/* データ管理画面 */
.data-management {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.data-section {
    background: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    border: 1px solid #f0f0f0;
}

.data-section.danger {
    border-color: #ffcdd2;
    background: #ffeaff;
}

.data-section h3 {
    margin-bottom: 10px;
    color: #333;
    font-size: 16px;
}

.data-btn {
    width: 100%;
    padding: 15px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s;
    margin-bottom: 10px;
}

.export-btn {
    background: #2196F3;
    color: white;
}

.export-btn:hover {
    background: #1976D2;
}

.import-btn {
    background: #FF9800;
    color: white;
}

.import-btn:hover {
    background: #F57C00;
}

.clear-btn {
    background: #f44336;
    color: white;
}

.clear-btn:hover {
    background: #d32f2f;
}

.data-description {
    font-size: 14px;
    color: #666;
    line-height: 1.4;
}

/* 空の状態 */
.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: #666;
}

.empty-state-icon {
    font-size: 48px;
    margin-bottom: 15px;
}

.empty-state-text {
    font-size: 16px;
}

/* レスポンシブ対応 */
@media (max-width: 480px) {
    .container {
        margin: 0;
        box-shadow: none;
    }
    
    .screen {
        padding: 15px;
    }
    
    .header {
        margin: -15px -15px 20px -15px;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
        gap: 10px;
    }
    
    .stat-item {
        padding: 15px;
    }
    
    .nav-buttons {
        flex-direction: column;
    }
}

/* アニメーション */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

@keyframes shimmer {
    0% {
        background-position: -200px 0;
    }
    100% {
        background-position: calc(200px + 100%) 0;
    }
}

@keyframes rainbow-gradient {
    0%, 100% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: scale(1.05) rotate(1deg) translateY(0);
    }
    40% {
        transform: scale(1.05) rotate(1deg) translateY(-6px);
    }
    60% {
        transform: scale(1.05) rotate(1deg) translateY(-3px);
    }
}

.screen.active {
    animation: fadeIn 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.mission-card {
    animation: slideIn 0.5s cubic-bezier(0.4, 0, 0.2, 1) 0.1s both;
}

.stat-item {
    animation: slideIn 0.5s cubic-bezier(0.4, 0, 0.2, 1) calc(0.1s * var(--item-index, 0)) both;
}

.stat-item:nth-child(1) { --item-index: 1; }
.stat-item:nth-child(2) { --item-index: 2; }
.stat-item:nth-child(3) { --item-index: 3; }

/* ホバー時のパルス効果 */
.complete-btn:hover {
    animation: pulse 1s infinite;
}

/* ローディング効果 */
.loading {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200px 100%;
    animation: shimmer 1.5s infinite;
}

/* PWA用のユーザー選択を無効化 */
button, input {
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

/* フッター */
.footer {
    background: linear-gradient(135deg, #065f46 0%, #047857 50%, #064e3b 100%);
    color: white;
    padding: 24px 20px;
    margin-top: 0;
    position: relative;
    overflow: hidden;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(6, 95, 70, 0.9) 0%, rgba(4, 120, 87, 0.9) 50%, rgba(6, 78, 59, 0.9) 100%);
    backdrop-filter: blur(10px);
}

.footer-content {
    text-align: center;
    position: relative;
    z-index: 1;
}

.footer-text {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 16px;
    letter-spacing: 0.5px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    font-size: 13px;
    font-weight: 500;
    transition: color 0.3s ease;
    border-bottom: 1px solid transparent;
    padding-bottom: 2px;
}

.footer-links a:hover {
    color: white;
    border-bottom-color: rgba(255, 255, 255, 0.5);
}

/* ポリシーページ用スタイル */
.back-btn-header {
    position: absolute;
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
    color: white;
    text-decoration: none;
    font-size: 16px;
    font-weight: 600;
    z-index: 2;
    padding: 8px 12px;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.1);
    transition: background 0.3s ease;
}

.back-btn-header:hover {
    background: rgba(255, 255, 255, 0.2);
}

.policy-content {
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.7;
}

.policy-section {
    margin-bottom: 32px;
    background: white;
    padding: 24px;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    border: 1px solid rgba(226, 232, 240, 0.8);
}

.policy-section h2 {
    color: #065f46;
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 2px solid #e2e8f0;
}

.policy-section h3 {
    color: #047857;
    font-size: 16px;
    font-weight: 600;
    margin: 20px 0 10px 0;
}

.policy-section p {
    color: #374151;
    margin-bottom: 12px;
}

.policy-section ul {
    color: #374151;
    margin: 12px 0;
    padding-left: 24px;
}

.policy-section li {
    margin-bottom: 8px;
}

.policy-section a {
    color: #10b981;
    text-decoration: none;
    font-weight: 500;
}

.policy-section a:hover {
    color: #059669;
    text-decoration: underline;
}

.policy-date {
    text-align: right;
    font-size: 14px;
    color: #6b7280;
    margin-top: 20px;
    font-style: italic;
}

.contact-info {
    background: #f8fafc;
    padding: 20px;
    border-radius: 8px;
    border-left: 4px solid #10b981;
    margin: 16px 0;
}

.contact-email {
    font-family: monospace;
    background: #e5e7eb;
    padding: 8px 12px;
    border-radius: 4px;
    display: inline-block;
    color: #1f2937;
    font-weight: 600;
}

.faq-item {
    background: #f0fdf4;
    padding: 16px;
    border-radius: 8px;
    margin: 16px 0;
    border-left: 4px solid #22c55e;
}

/* 使い方ページ用スタイル */
.howto-step {
    margin: 20px 0;
    padding: 16px;
    background: #f8fafc;
    border-radius: 8px;
    border-left: 4px solid #10b981;
}

.howto-step h3 {
    color: #065f46;
    margin-bottom: 12px;
    font-size: 16px;
}

.feature-item {
    margin: 20px 0;
    padding: 16px;
    background: #fefefe;
    border-radius: 8px;
    border: 1px solid #e2e8f0;
}

.feature-item h3 {
    color: #047857;
    margin-bottom: 12px;
    font-size: 16px;
}

.tip-item {
    margin: 20px 0;
    padding: 16px;
    background: #fffbeb;
    border-radius: 8px;
    border-left: 4px solid #f59e0b;
}

.tip-item h3 {
    color: #92400e;
    margin-bottom: 12px;
    font-size: 16px;
}

.tech-info {
    margin: 20px 0;
    padding: 16px;
    background: #f1f5f9;
    border-radius: 8px;
    border-left: 4px solid #3b82f6;
}

.tech-info h3 {
    color: #1e40af;
    margin-bottom: 12px;
    font-size: 16px;
}

/* 設定画面のスタイル */
.settings-content {
    padding: 20px 0;
}

.setting-section {
    background: #ffffff;
    border-radius: 16px;
    padding: 24px;
    margin-bottom: 24px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
    border: 1px solid #f1f5f9;
}

.setting-section h2 {
    color: #1e293b;
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.setting-description {
    color: #64748b;
    font-size: 0.95rem;
    margin-bottom: 20px;
}

/* 言語選択 */
.language-selector {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.language-option {
    position: relative;
}

.language-option input[type="radio"] {
    opacity: 0;
    position: absolute;
    width: 0;
    height: 0;
}

.language-label {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 20px;
    background: #f8fafc;
    border: 2px solid #e2e8f0;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1rem;
    font-weight: 500;
}

.language-label:hover {
    background: #f1f5f9;
    border-color: #cbd5e1;
    transform: translateY(-1px);
}

.language-option input[type="radio"]:checked + .language-label {
    background: #ecfdf5;
    border-color: #10b981;
    color: #065f46;
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

.language-option input[type="radio"]:checked + .language-label::after {
    content: '✓';
    position: absolute;
    right: 16px;
    color: #10b981;
    font-weight: 700;
    font-size: 1.2rem;
}

.language-flag {
    font-size: 1.5rem;
}

.language-name {
    font-weight: 500;
}

.setting-note {
    margin-top: 16px;
    padding: 12px 16px;
    background: #f8fafc;
    border-radius: 8px;
    border-left: 4px solid #10b981;
}

.note-text {
    color: #475569;
    font-size: 0.9rem;
    margin: 0;
}

/* 今後追加予定の設定項目 */
.coming-soon {
    opacity: 0.7;
}

.coming-soon h2::after {
    content: '(開発中)';
    font-size: 0.8rem;
    color: #94a3b8;
    font-weight: normal;
    margin-left: 8px;
}

.coming-soon-items {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.coming-soon-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: #f8fafc;
    border-radius: 8px;
    border: 1px solid #e2e8f0;
}

.item-icon {
    font-size: 1.2rem;
}

.item-name {
    flex: 1;
    color: #475569;
    font-weight: 500;
}

.item-status {
    font-size: 0.8rem;
    color: #94a3b8;
    background: #f1f5f9;
    padding: 4px 8px;
    border-radius: 4px;
}

/* タッチデバイス対応 */
@media (hover: none) and (pointer: coarse) {
    .difficulty-btn:hover,
    .complete-btn:hover,
    .nav-btn:hover,
    .back-btn:hover {
        transform: none;
        box-shadow: none;
    }
    
    .difficulty-btn:active,
    .complete-btn:active,
    .nav-btn:active {
        transform: scale(0.95);
    }

    .language-label:hover {
        transform: none;
    }

    .language-label:active {
        transform: scale(0.98);
    }
}