@charset "UTF-8";

/* ============================================
   リセット・ベーススタイル
   ============================================ */

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Osaka, Verdana, sans-serif;
    line-height: 1.6;
    color: #000000;
    background-color: #ffffff;
    text-align: left;
}

/* ============================================
   レイアウト・グリッド
   ============================================ */

.page-wrapper {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.main-content {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 2rem;
    flex: 1;
    padding: 2rem 1rem;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.container {
    grid-column: 2;
    order: 2;
}

.sidebar {
    grid-column: 1;
    order: 1;
}

/* タブレット対応 */
@media (max-width: 768px) {
    .main-content {
        grid-template-columns: 1fr;
        gap: 1.5rem;
        padding: 1rem;
    }

    .container {
        grid-column: 1;
        order: 1;
    }

    .sidebar {
        grid-column: 1;
        order: 2;
    }
}

/* ============================================
   ヘッダー
   ============================================ */

.header {
    background-color: #ffffff;
    border-bottom: solid 2px #e5e5e5;
    padding: 2rem 1rem;
    text-align: center;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.header-inner {
    max-width: 1200px;
    margin: 0 auto;
}

.site-title {
    font-size: 2rem;
    font-weight: bold;
    margin-bottom: 0.5rem;
    letter-spacing: 1px;
}

.site-title a {
    color: #000000;
    text-decoration: none;
    transition: color 0.3s ease;
}

.site-title a:hover {
    color: #808080;
}

.site-tagline {
    font-size: 0.95rem;
    color: #666666;
    letter-spacing: 0.5px;
}

@media (max-width: 600px) {
    .header {
        padding: 1.5rem 1rem;
    }

    .site-title {
        font-size: 1.5rem;
    }
}

/* ============================================
   ヒーロー・セクション
   ============================================ */

.hero-section {
    margin: 0 0 2rem 0;
    overflow: hidden;
}

.hero-image {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ============================================
   記事セクション
   ============================================ */

.article-section {
    margin-bottom: 3rem;
    border-left: solid 1px #808080;
    border-right: solid 1px #808080;
    border-bottom: solid 1px #808080;
    padding: 1.5rem;
    background-color: #ffffff;
}

.article-title {
    font-size: 1.8rem;
    font-weight: bold;
    margin: -1.5rem -1.5rem 1rem -1.5rem;
    padding: 1rem 1.5rem;
    line-height: 1.3;
    color: #000000;
    letter-spacing: 0.5px;
    border-top: solid 1px #808080;
    border-left: solid 1px #808080;
    border-right: solid 1px #808080;
}

.article-meta {
    display: flex;
    gap: 2rem;
    font-size: 0.9rem;
    color: #666666;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: dashed 1px #dddddd;
}

.article-meta time {
    display: flex;
    align-items: center;
}

.reading-time {
    display: flex;
    align-items: center;
}

.article-body {
    background-color: #ffffff;
    padding: 0;
    margin: 0;
}

.article-body p {
    margin: 1em 0;
    text-align: left;
    line-height: 1.8;
}

.article-subsection {
    margin: 2em 0;
}

.article-subsection h3 {
    font-size: 1.3rem;
    font-weight: bold;
    margin: 1.2em 0 0.8em 0;
    color: #000000;
    padding: 0;
    border-left: solid 4px #808080;
    padding-left: 1em;
    letter-spacing: 0.5px;
}

.article-body ul,
.article-body ol {
    margin: 1.2em 2em;
    padding: 0;
}

.article-body li {
    margin: 0.5em 0;
}

.article-body a {
    color: #0000ff;
    text-decoration: none;
    border-bottom: solid 1px #0000ff;
    transition: all 0.3s ease;
}

.article-body a:hover {
    background-color: #f0f0f0;
}

.article-body a:active {
    color: #ff0000;
}

/* ============================================
   関連リンク
   ============================================ */

.related-links {
    background-color: #b5d5e8;
    padding: 1rem;
    margin-bottom: 2rem;
    border-left: solid 1px #808080;
    border-right: solid 2px #e5e5e5;
    border-bottom: solid 2px #e5e5e5;
    border-top: solid 1px #808080;
}

.related-links h2 {
    font-size: 1.1rem;
    font-weight: bold;
    color: #000000;
    margin: 0 0 1rem 0;
    padding: 0;
}

.related-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.related-list li {
    margin: 0.5rem 0;
    padding: 0;
}

.related-list a {
    color: #000000;
    text-decoration: none;
    border-bottom: none;
    display: block;
    padding: 0.5rem 0;
    transition: background-color 0.2s ease;
}

.related-list a:hover {
    background-color: rgba(255, 255, 255, 0.5);
}

/* ============================================
   サイドバー
   ============================================ */

.sidebar {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    grid-column: 1;
    order: 1;
}

.sidebar-module {
    background-color: #ffffff;
    border-right: solid 2px #e5e5e5;
    border-bottom: solid 2px #e5e5e5;
    overflow: hidden;
}

.sidebar-title {
    font-size: 0.95rem;
    font-weight: bold;
    margin: 0;
    padding: 0.7rem 0.8rem;
    color: #000000;
    background-color: #f3c07a;
    border: none;
    letter-spacing: 0px;
}

.sidebar-content {
    padding: 0.8rem 0.8rem;
    font-size: 0.9rem;
    border-left: solid 1px #808080;
    border-bottom: solid 1px #808080;
    border-right: solid 1px #808080;
}

.sidebar-content p {
    margin: 0.5em 0;
    font-size: 0.95rem;
    line-height: 1.5;
}

.sidebar-logo {
    max-width: 100%;
    height: auto;
    margin-top: 0.5rem;
    display: block;
}

/* ナビゲーションリスト */

.nav-list {
    list-style: none;
    padding: 0.8rem;
    margin: 0;
    font-size: 0.85rem;
    border-left: solid 1px #808080;
    border-bottom: solid 1px #808080;
    border-right: solid 1px #808080;
    letter-spacing: 0px;
}

.nav-list li {
    padding: 0.3rem 0;
    margin: 0;
}

.nav-list a {
    color: #000000;
    text-decoration: none;
    border-bottom: none;
    display: block;
    padding: 0.3rem 0.5rem;
    transition: background-color 0.2s ease;
}

.nav-list a:hover {
    background-color: #f5f5f5;
}

/* 買取モジュール */

.buyback-module {
    border: none;
}

.buyback-module .sidebar-title {
    background-color: #d99bf7;
}

.buyback-module .sidebar-content {
    padding: 1rem;
    border: none;
}

.buyback-link {
    display: block;
    margin: 0.5rem 0;
}

.buyback-link img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* タブレット対応 */
@media (max-width: 768px) {
    .sidebar {
        grid-column: 1;
    }

    .sidebar-title {
        font-size: 0.9rem;
    }

    .nav-list {
        font-size: 0.8rem;
    }
}

/* ============================================
   テーブル
   ============================================ */

.article-body table {
    margin: 1.5em 0;
    font-size: 0.95rem;
    border-collapse: collapse;
    width: 100%;
    border: solid 1px #808080;
    text-align: left;
}

.article-body th {
    padding: 0.7rem;
    margin: 0;
    border: solid 1px #808080;
    color: #333333;
    font-weight: bold;
    background-color: #f5f5f5;
}

.article-body td {
    padding: 0.7rem;
    margin: 0;
    border: solid 1px #808080;
}

/* ============================================
   フッター
   ============================================ */

.footer {
    background-color: #f8f8f8;
    border-top: solid 1px #e5e5e5;
    margin-top: auto;
    padding: 2rem 1rem;
    text-align: center;
}

.footer-inner {
    max-width: 1200px;
    margin: 0 auto;
}

.footer p {
    margin: 0.5rem 0;
    font-size: 0.9rem;
    color: #666666;
}

.footer-nav {
    margin-top: 1rem;
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.footer-nav a {
    color: #0000ff;
    text-decoration: none;
    border-bottom: solid 1px #0000ff;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.footer-nav a:hover {
    background-color: #f0f0f0;
}

/* ============================================
   リンク・デコレーション
   ============================================ */

a {
    transition: all 0.3s ease;
}

a:link {
    /* デフォルト状態 */
}

a:visited {
    /* 訪問済み */
}

a:hover {
    /* ホバー */
}

a:active {
    /* クリック中 */
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ============================================
   ユーティリティ・クラス
   ============================================ */

.hidden {
    display: none;
}

.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: #000000;
    color: #ffffff;
    padding: 8px;
    text-decoration: none;
    z-index: 100;
}

.skip-link:focus {
    top: 0;
}

/* ============================================
   アクセシビリティ・プリント対応
   ============================================ */

@media print {
    .sidebar,
    .footer,
    nav {
        display: none;
    }

    .article-section {
        max-width: 100%;
    }
}

/* ============================================
   ダークモード対応（オプション）
   ============================================ */

@media (prefers-color-scheme: dark) {
    /* ダークモード対応が必要な場合はここに追加 */
}