:root {
    --primary-color: #0066cc;
    --secondary-color: #4d94ff;
    --background-color: #ffffff;
    --text-color: #333333;
    --card-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
    --gradient-primary: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

/* ダークモード */
[data-theme="dark"] {
    --background-color: #1a1a1a;
    --text-color: #ffffff;
    --card-bg: #2d2d2d;
    --border-color: #404040;
    
    background: #1a1a1a;
    color: var(--text-color);
}

body {
    background: linear-gradient(135deg, #f8f9fa, #ffffff);
    color: var(--text-color);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

.navbar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.navbar-brand {
    font-weight: 600;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.card {
    border: none;
    border-radius: 16px;
    box-shadow: var(--card-shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    background: rgba(255, 255, 255, 0.95);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 20px rgba(0, 0, 0, 0.15);
}

.btn-primary {
    background: var(--gradient-primary);
    border: none;
    padding: 12px 24px;
    border-radius: 8px;
    font-weight: 500;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 102, 204, 0.3);
}

.btn-outline-primary {
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    font-weight: 500;
}

.btn-outline-primary:hover {
    background: var(--gradient-primary);
    border-color: transparent;
}

.form-control, .form-select {
    border: 2px solid #e9ecef;
    border-radius: 8px;
    padding: 12px;
    transition: all 0.3s ease;
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

.result-box {
    background: linear-gradient(135deg, #f8f9fa, #ffffff);
    border-radius: 12px;
    border-left: 4px solid var(--primary-color);
    padding: 20px;
}

.tax-amount {
    font-size: 1.4em;
    font-weight: 700;
    color: var(--primary-color);
}

.accordion-button {
    background: transparent;
    padding: 16px;
    font-weight: 500;
}

.accordion-button:not(.collapsed) {
    background: var(--gradient-primary);
    color: white;
}

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

.calculator-section, .info-section, .faq-section {
    animation: fadeIn 0.8s ease-out forwards;
}

@media (max-width: 768px) {
    .card {
        margin-bottom: 20px;
    }
    
    .container {
        padding: 0 20px;
    }
    
    h1 {
        font-size: 2rem;
    }
}

[data-theme="dark"] .card {
    background: rgba(45, 45, 45, 0.95);
}

[data-theme="dark"] .form-control,
[data-theme="dark"] .form-select {
    background-color: #333;
    border-color: #444;
    color: #fff;
}

.footer {
    background-color: var(--background-color);
    border-top: 1px solid rgba(0, 0, 0, 0.1);
}

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

/* レスポンシブデザイン */
@media (max-width: 768px) {
    .calculator-section {
        padding: 0 15px;
    }
} 

/* 既存のスタイルに追加 */

.info-card {
    height: 100%;
    transition: transform 0.2s;
}

.info-card:hover {
    transform: translateY(-5px);
}

.result-box {
    border-left: 4px solid var(--primary-color);
}

.tax-amount {
    font-size: 1.2em;
    font-weight: bold;
    color: var(--primary-color);
}

.calculator-section .card {
    transition: box-shadow 0.3s;
}

.calculator-section .card:hover {
    box-shadow: 0 8px 12px rgba(0, 0, 0, 0.15);
}

.form-select, .form-control {
    border-radius: 8px;
}

.input-group-text {
    background-color: var(--primary-color);
    color: white;
    border: none;
}

/* レスポンシブ対応を強化 */
@media (max-width: 768px) {
    .info-section {
        margin-top: 2rem;
    }
    
    .info-card {
        margin-bottom: 1rem;
    }
    
    .card-title {
        font-size: 1.25rem;
    }
} 

/* コンテンツの可読性向上 */
p, li {
    line-height: 1.8;
    color: var(--text-color);
}

/* 見出しの階層を視覚的に明確に */
h1 {
    font-size: 2.5rem;
    font-weight: 700;
}

h2 {
    font-size: 2rem;
    font-weight: 600;
}

h3 {
    font-size: 1.5rem;
    font-weight: 600;
}

/* アクセシビリティ向上 */
.form-label {
    font-weight: 500;
}

/* フォーカス時の視覚的フィードバック */
.form-control:focus,
.form-select:focus {
    box-shadow: 0 0 0 0.25rem rgba(0, 122, 255, 0.25);
}

/* ローディング表示 */
.loading-spinner {
    width: 24px;
    height: 24px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    display: inline-block;
    margin-right: 8px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* フィードバック表示 */
.feedback-message {
    padding: 12px;
    border-radius: 8px;
    margin-top: 16px;
    display: flex;
    align-items: center;
    font-weight: 500;
}

.feedback-success {
    background-color: rgba(40, 167, 69, 0.1);
    color: #28a745;
}

.feedback-error {
    background-color: rgba(220, 53, 69, 0.1);
    color: #dc3545;
}

/* ダークモードトグル */
.dark-mode-toggle {
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.3s;
}

.dark-mode-toggle:hover {
    background-color: rgba(0, 0, 0, 0.1);
}

.dark-mode-toggle img {
    width: 24px;
    height: 24px;
    transition: transform 0.3s;
}

[data-theme="dark"] .dark-mode-toggle img {
    transform: rotate(180deg);
    filter: invert(1);
}

/* ダークモード時のナビゲーションバー */
[data-theme="dark"] .navbar {
    background: rgba(0, 0, 0, 0.95);
}

[data-theme="dark"] .navbar-light .navbar-nav .nav-link {
    color: rgba(255, 255, 255, 0.8);
}

[data-theme="dark"] .navbar-light .navbar-nav .nav-link:hover {
    color: rgba(255, 255, 255, 1);
}

/* 計算方法の説明スタイル */
.calculation-method .card {
    background-color: var(--bg-secondary);
    border-left: 4px solid var(--primary-color);
}

.calculation-method ul {
    margin-bottom: 0.5rem;
}

.calculation-method ul li {
    margin-bottom: 0.25rem;
}

.calculation-method .h6 {
    color: var(--primary-color);
    margin-bottom: 0.75rem;
}

/* ダークモード対応 */
.dark-mode .calculation-method .card {
    background-color: var(--dark-bg-secondary);
}

[data-theme="dark"] .navbar {
    background: rgba(26, 26, 26, 0.95);
    border-bottom: 1px solid var(--border-color);
}

[data-theme="dark"] .navbar-light .navbar-nav .nav-link {
    color: rgba(255, 255, 255, 0.8);
}

[data-theme="dark"] .navbar-light .navbar-nav .nav-link:hover,
[data-theme="dark"] .navbar-light .navbar-nav .nav-link.active {
    color: #fff;
}

[data-theme="dark"] .card,
[data-theme="dark"] .info-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
}

[data-theme="dark"] .form-control,
[data-theme="dark"] .form-select {
    background-color: #333;
    border-color: var(--border-color);
    color: var(--text-color);
}

[data-theme="dark"] .form-control:focus,
[data-theme="dark"] .form-select:focus {
    background-color: #404040;
    border-color: var(--primary-color);
    color: var(--text-color);
}

[data-theme="dark"] .alert-info {
    background-color: rgba(0, 123, 255, 0.1);
    border-color: rgba(0, 123, 255, 0.2);
    color: var(--text-color);
}

[data-theme="dark"] .breadcrumb-item.active {
    color: #999;
}

[data-theme="dark"] .breadcrumb-item a {
    color: var(--primary-color);
}

[data-theme="dark"] .footer {
    background-color: var(--background-color);
    border-top: 1px solid var(--border-color);
}

/* ダークモードトグルボタンのスタイル */
.dark-mode-toggle {
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.3s;
}

.dark-mode-toggle:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.dark-mode-toggle i {
    font-size: 1.2rem;
    color: var(--text-color);
    transition: transform 0.3s;
}

[data-theme="dark"] .dark-mode-toggle:hover {
    background-color: rgba(255, 255, 255, 0.1);
}