/* --- Variables & Base --- */
/* 一覧ページ・詳細ページ共通のベース設定 */

/* 1. Page Header (一覧ページ用) */
.page-header {
    position: relative;
    padding: 120px 0 60px;
    background-color: var(--color-white);
    color: var(--color-primary);
    overflow: hidden;
}
.page-header__bg {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background-size: cover;
    background-position: center;
    z-index: 1;
}
.page-header .container { position: relative; z-index: 2; }
.page-header__title {
    font-size: clamp(40px, 8vw, 80px);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 40px;
}
.page-header__title span {
    display: block; font-family: var(--font-en); font-size: 16px;
    color: var(--color-accent); letter-spacing: 0.5em; margin-bottom: 20px;
}
.page-header__lead {
    font-size: 18px; line-height: 2.2; max-width: 900px; opacity: 0.95;
    font-feature-settings: "palt";
}

/* 2. Article Header (詳細ページ用) */
.article-header {
    position: relative;
    padding: 100px 0 40px; 
    background-color: var(--color-white);
    color: var(--color-primary);
    overflow: hidden;
}
.article-header__bg {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background-color: var(--color-bg);
    z-index: 1;
}
.article-header .container { position: relative; z-index: 2; }
.article-header__meta {
    display: flex; gap: 30px; font-family: var(--font-en);
    font-size: 15px; font-weight: 600; letter-spacing: 0.1em; margin-bottom: 20px;
}
.article-header__date { color: var(--color-accent); }
.article-header__title {
    font-size: clamp(32px, 5vw, 48px);
    font-weight: 700; line-height: 1.4; font-feature-settings: "palt"; margin-bottom: 40px;
}

/* --- Detailed Article Parts --- */

/* Thumbnail (詳細ページ：比率維持) */
.article-header__thumbnail {
    width: 100%; max-width: 1200px; margin: 0 auto;
    overflow: hidden; position: relative;
    margin-bottom: -60px; z-index: 5;
    box-shadow: 0 30px 80px rgba(0,0,0,0.06);
}
.article-header__thumbnail img {
    width: 100%; height: auto; display: block;
}

/* Table of Contents (詳細ページ用) */
.article-toc {
		margin-top: -5em;
		margin-bottom: 3em;
		position: relative;
		z-index: 2;
}
.article-toc__inner {
    background-color: var(--color-white);
    padding: 40px 60px; border: 1px solid rgba(0,0,0,0.05);
    max-width: 900px; margin: 0 auto;
}
.article-toc__title {
    font-family: var(--font-en); font-size: 14px; letter-spacing: 0.4em;
    color: var(--color-accent); margin-bottom: 30px; text-align: center;
}
.article-toc ul { display: grid; grid-template-columns: 1fr 1fr; gap: 15px 40px; }
.article-toc li a { font-size: 14px; font-weight: 700; color: var(--color-text); display: flex; align-items: center; gap: 12px; }

/* Article Sections (詳細ページ：PC交互配置) */
.article-section { padding: 80px 0; background-color: var(--color-white); overflow: hidden; }
.article-section--reverse { background-color: var(--color-bg); }
.article-section__inner { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: center; }
.article-section__visual { grid-column: 1; }
.article-section__content { grid-column: 2; }
.article-section--reverse .article-section__visual { grid-column: 2; }
.article-section--reverse .article-section__content { grid-column: 1; grid-row: 1; }

.article-section__img img {
    width: 100%; height: 500px; object-fit: cover;
    display: block; box-shadow: 20px 20px 60px rgba(0,0,0,0.03);
}
.article-section__title {
    font-size: clamp(22px, 3vw, 30px); font-weight: 700; margin-bottom: 30px;
    color: var(--color-primary); font-feature-settings: "palt"; line-height: 1.4;
}
.article-section__text { font-size: 16px; line-height: 2.2; color: var(--color-text-light); font-feature-settings: "palt"; }
.article-section__text p + p { margin-top: 1.5em; }

/* Summary Section (詳細ページ：ネイビー背景) */
.article-section--summary {
    background-color: var(--color-primary); color: var(--color-white); padding: 100px 0;
}
.article-section--summary .article-section__title { color: var(--color-white); text-align: center; margin-bottom: 40px; }
.article-section--summary .article-section__text { color: rgba(255, 255, 255, 0.85); }

/* --- Column List Section (一覧ページ専用レイアウト) --- */
.column-list { padding: 80px 0; background-color: var(--color-white); }
.column-list__grid {
    display: grid; grid-template-columns: repeat(2, 1fr); gap: 60px 40px;
}

/* 一覧ページのカード：重ねないデザインへの上書き */
.column-list__item .nav-card {
    background-color: var(--color-white);
    color: var(--color-text);
    min-height: auto;
    display: flex;
    flex-direction: column;
    box-shadow: 0 10px 40px rgba(0,0,0,0.04);
}

.column-list__item .nav-card__img {
    position: relative; /* absoluteから変更 */
    height: 280px; /* 一覧ページでの画像高さを固定 */
    opacity: 1;
}

.column-list__item .nav-card::after {
    display: none; /* グラデーションオーバーレイを削除 */
}

.column-list__item .nav-card__content {
    margin-top: 0; /* autoからリセット */
    padding: 30px;
    background: var(--color-white);
}

.column-list__item .nav-card__title {
    color: var(--color-primary);
    margin-bottom: 15px;
}

.column-list__item .nav-card__excerpt {
    color: var(--color-text-light);
    margin-bottom: 25px;
}

.column-list__item .nav-card__date {
    margin-bottom: 10px;
}

/* --- Common Card Style (詳細下部・ベース定義) --- */
.nav-card {
    display: flex; flex-direction: column; height: 100%; min-height: 400px;
    position: relative; overflow: hidden; color: var(--color-white);
    background-color: var(--color-primary);
}

.nav-card__img {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    background-size: cover; background-position: center;
    transition: transform 1.5s cubic-bezier(0.165, 0.84, 0.44, 1);
    opacity: 0.8;
}
.nav-card::after {
    content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    background: linear-gradient(to top, rgba(31,42,55,0.95) 0%, rgba(31,42,55,0.2) 100%);
}
.nav-card__content { position: relative; z-index: 2; margin-top: auto; padding: 40px; }
.nav-card__sub, .nav-card__date {
    font-family: var(--font-en); font-size: 13px; letter-spacing: 0.3em;
    color: var(--color-accent); margin-bottom: 12px; display: block;
}
.nav-card__title { font-size: 22px; font-weight: 700; margin-bottom: 15px; line-height: 1.5; }
.nav-card__excerpt {
    font-size: 14px; line-height: 1.8; opacity: 0.8; margin-bottom: 20px;
    display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden;
}
.nav-card__arrow { font-family: var(--font-en); font-size: 20px; transition: transform 0.4s; display: inline-block; }

.nav-card:hover .nav-card__img { transform: scale(1.08); }
.nav-card:hover .nav-card__arrow { transform: translateX(10px); }

/* --- Markers & Utils --- */
.u-marker { background: linear-gradient(transparent 60%, rgba(184, 167, 122, 0.25) 0%); font-weight: 700; }
.u-marker-white { background: linear-gradient(transparent 60%, rgba(184, 167, 122, 0.4) 0%); font-weight: 700; color: var(--color-white); }
.u-list-circle { margin: 30px 0; }
.u-list-circle li { position: relative; padding-left: 25px; margin-bottom: 12px; }
.u-list-circle li::before { content: ''; position: absolute; left: 0; top: 0.9em; width: 8px; height: 8px; border-radius: 50%; background-color: var(--color-accent); }

/* --- Footer Area Navigation & Contact --- */
.more-articles { padding: 80px 0; background-color: var(--color-bg); }
.more-articles__header { margin-bottom: 40px; text-align: center; }
.more-articles__grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }

.navigation-links { padding: 60px 0 0; margin-bottom: -40px; background-color: var(--color-white); }
.navigation-links__grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }

.container--narrow { max-width: 840px; margin: 0 auto; padding: 0 40px; }

/* --- Responsive Optimization --- */
@media (max-width: 1024px) {
    /* Headers & Thumbnails */
    .page-header { padding: 100px 0 40px; }
    .article-header { padding: 100px 0 30px; }
    .article-header__thumbnail { margin-bottom: -40px; width: calc(100% - 40px); }
    
    /* List View Fix */
    .column-list { padding: 60px 0; }
    .column-list__grid { grid-template-columns: 1fr; gap: 30px; }
    .column-list__item .nav-card__img { height: 240px; }
    
    /* Detailed Sections Fix (Stack Images on top) */
    .article-toc {
			margin-top: -1em;
			margin-bottom: 3em;
			padding: 0;
		}
    .article-toc__inner { padding: 30px 20px; width: calc(100% - 40px); }
    .article-toc ul { grid-template-columns: 1fr; gap: 12px; }
    
    .article-section { padding: 40px 0; }
    .article-section__inner { display: flex; flex-direction: column; gap: 30px; }
    .article-section__visual { order: 1 !important; grid-column: 1 !important; width: 100%; }
    .article-section__img img { height: 320px; width: 100%; }
    .article-section__content { order: 2 !important; grid-column: 1 !important; padding: 0 10px; width: 100%; }
    
    /* Navigation & Contact */
		.more-articles { padding: 60px 0; }
    .more-articles__grid, .navigation-links__grid { grid-template-columns: 1fr; gap: 20px; }
    .nav-card { min-height: 300px; }
}

@media (max-width: 640px) {
    .page-header__title { font-size: 32px; }
    .article-header__title { font-size: 24px; }
    .article-section__title { font-size: 20px; }
    .article-section__text { font-size: 15px; }
    .container--narrow { padding: 0 20px; }
    .nav-card__content { padding: 30px 20px; }
    .column-list__item .nav-card__img { height: 200px; }
}