:root {
    --primary-color: #007AFF;
    --secondary-color: #5856D6;
    --background-color: #ffffff;
    --text-color: #000000;
    --border-color: rgba(0, 0, 0, 0.1);
    --card-background: #ffffff;
}

/* ダークモード */
[data-theme="dark"] {
    --background-color: #000000;
    --text-color: #ffffff;
    --border-color: rgba(255, 255, 255, 0.1);
    --card-background: #1c1c1e;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
}

.navbar {
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    background-color: rgba(255, 255, 255, 0.8) !important;
    border-bottom: 1px solid var(--border-color);
}

.calculator-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

.card {
    background-color: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    overflow: hidden;
    transition: transform 0.2s;
}

.card:hover {
    transform: translateY(-2px);
}

.card-header {
    background-color: rgba(var(--primary-color-rgb), 0.1);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem;
}

.card-title {
    margin: 0;
    font-size: 1.1rem;
    font-weight: 600;
}

.section-title {
    font-size: 1.5rem;
    font-weight: 600;
    text-align: center;
    margin-bottom: 2rem;
}

.form-control {
    border: 1px solid var(--border-color);
    background-color: var(--background-color);
    color: var(--text-color);
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(var(--primary-color-rgb), 0.25);
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-outline-primary {
    color: var(--primary-color);
    border-color: var(--primary-color);
}

.theme-switch {
    cursor: pointer;
    padding: 0.5rem;
    font-size: 1.2rem;
}

.footer {
    background-color: var(--card-background);
    border-top: 1px solid var(--border-color);
}

.footer-links a {
    color: var(--text-color);
    text-decoration: none;
    margin: 0 0.5rem;
}

.table {
    color: var(--text-color);
}

.alert {
    background-color: rgba(var(--primary-color-rgb), 0.1);
    border: 1px solid var(--border-color);
    color: var(--text-color);
}

@media (max-width: 768px) {
    .calculator-container {
        padding: 1rem;
    }
    
    .card {
        margin-bottom: 1rem;
    }
}

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

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

/* ヒーローセクション */
.hero-section {
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 3rem 1rem;
    border-radius: 1rem;
    margin-bottom: 3rem;
}

.hero-section .display-4 {
    font-weight: 700;
    margin-bottom: 1rem;
}

.feature-badges .badge {
    font-size: 1rem;
    padding: 0.5rem 1rem;
}

/* クイック計算タブ */
.quick-calc-tabs .nav-pills .nav-link {
    border-radius: 2rem;
    padding: 1rem 2rem;
    font-weight: 500;
    color: var(--text-color);
    background-color: var(--card-background);
    border: 1px solid var(--border-color);
    margin: 0 0.5rem;
}

.quick-calc-tabs .nav-pills .nav-link.active {
    background-color: var(--primary-color);
    color: white;
}

/* 使い方ガイド */
.usage-guide .list-group-item {
    background-color: var(--card-background);
    color: var(--text-color);
    border-color: var(--border-color);
}

/* アニメーション */
.calculator-container {
    animation: slideUp 0.5s ease-out;
}

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

.results-fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.3s ease-out, transform 0.3s ease-out;
}

.results-fade-in.show {
    opacity: 1;
    transform: translateY(0);
}

/* ブログ記事用スタイル */
.blog-article {
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.7;
}

.blog-article h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.blog-article h2 {
    font-size: 1.8rem;
    font-weight: 600;
    margin-top: 3rem;
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--primary-color);
}

.blog-article h3 {
    font-size: 1.4rem;
    font-weight: 600;
    margin-top: 2rem;
    margin-bottom: 1rem;
    color: var(--secondary-color);
}

.blog-article p {
    margin-bottom: 1.5rem;
    text-align: justify;
}

.blog-article ul, .blog-article ol {
    margin-bottom: 1.5rem;
    padding-left: 2rem;
}

.blog-article li {
    margin-bottom: 0.5rem;
}

/* 目次スタイル */
.table-of-contents {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-left: 4px solid var(--primary-color);
}

.table-of-contents a {
    color: var(--text-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

.table-of-contents a:hover,
.table-of-contents a.active {
    color: var(--primary-color);
    font-weight: 600;
}

/* 数式・計算ボックス */
.formula-box, .calculation-box {
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    border: 1px solid #dee2e6;
    border-radius: 8px;
    font-family: 'Courier New', monospace;
    position: relative;
}

.formula-box:hover, .calculation-box:hover {
    box-shadow: 0 4px 12px rgba(0,123,255,0.15);
}

/* コピーボタン */
.copy-button {
    opacity: 0;
    transition: opacity 0.3s ease;
}

.formula-box:hover .copy-button,
.calculation-box:hover .copy-button {
    opacity: 1;
}

/* 著者情報 */
.author-info {
    border-left: 4px solid var(--primary-color);
}

.author-avatar {
    color: var(--primary-color);
}

/* 読書進捗バー */
.reading-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: rgba(0,123,255,0.1);
    z-index: 9999;
}

.reading-progress-bar {
    height: 100%;
    background: linear-gradient(90deg, #007bff, #0056b3);
    width: 0%;
    transition: width 0.3s ease;
}

/* テーブルの改善 */
.table-responsive {
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.table th {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    font-weight: 600;
    border: none;
}

.table td {
    border-color: var(--border-color);
    vertical-align: middle;
}

/* アラートの改善 */
.alert {
    border-radius: 8px;
    border: none;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.alert-info {
    background: linear-gradient(135deg, #d1ecf1, #bee5eb);
    color: #0c5460;
}

.alert-warning {
    background: linear-gradient(135deg, #fff3cd, #ffeaa7);
    color: #856404;
}

.alert-danger {
    background: linear-gradient(135deg, #f8d7da, #f5c6cb);
    color: #721c24;
}

.alert-success {
    background: linear-gradient(135deg, #d4edda, #c3e6cb);
    color: #155724;
}

/* カードの改善 */
.card.border-primary {
    border-color: var(--primary-color) !important;
    box-shadow: 0 4px 12px rgba(0,123,255,0.15);
}

.card.border-success {
    border-color: #28a745 !important;
    box-shadow: 0 4px 12px rgba(40,167,69,0.15);
}

.card.border-warning {
    border-color: #ffc107 !important;
    box-shadow: 0 4px 12px rgba(255,193,7,0.15);
}

.card.border-danger {
    border-color: #dc3545 !important;
    box-shadow: 0 4px 12px rgba(220,53,69,0.15);
}

/* レスポンシブ対応 */
@media (max-width: 768px) {
    .blog-article h1 {
        font-size: 2rem;
    }

    .blog-article h2 {
        font-size: 1.5rem;
    }

    .blog-article h3 {
        font-size: 1.2rem;
    }

    .table-of-contents {
        font-size: 0.9rem;
    }

    .formula-box, .calculation-box {
        font-size: 0.8rem;
    }
}