/* ─────────────────────────────────────────────────────────
   blog.css ─ お役立ち情報 一覧ページ専用スタイル
   article.css と同じく styles.css の :root を継承。
   DESIGN.md 準拠:罫線・余白で構造を作る/角丸は最小限/暖色禁止。
   ───────────────────────────────────────────────────────── */

body.blog-page {
    background: var(--paper);
}
body.blog-page main {
    padding-top: 84px; /* fixed header height */
}
body.blog-page .reveal,
body.blog-page .reveal[data-stagger] > * {
    opacity: 1;
    transform: none;
}

/* ─────────── パンくず ─────────── */
.blog-breadcrumb {
    border-bottom: 1px solid var(--rule-2);
    background: var(--paper);
}
.blog-breadcrumb-inner {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
    padding: 18px 0;
    font-size: 11.5px;
    color: var(--ink-3);
    letter-spacing: 0.04em;
}
.blog-breadcrumb a {
    color: var(--ink-3);
    text-decoration: none;
    transition: color 0.2s ease;
}
.blog-breadcrumb a:hover {
    color: var(--accent);
}
.blog-breadcrumb .sep {
    opacity: 0.55;
    font-size: 10px;
}
.blog-breadcrumb .current {
    color: var(--ink-2);
    font-weight: 500;
}

/* ─────────── ページヘッダー ─────────── */
.blog-archive-hero {
    background: linear-gradient(180deg, #f7f9fc 0%, var(--paper) 100%);
    padding: clamp(56px, 8vw, 112px) 0 clamp(40px, 6vw, 72px);
    border-bottom: 1px solid var(--rule-2);
    position: relative;
    overflow: hidden;
}
.blog-archive-hero::after {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    background:
        radial-gradient(circle at 92% 10%, rgba(37, 99, 235, 0.045) 0%, transparent 55%),
        radial-gradient(circle at 4% 95%, rgba(37, 99, 235, 0.04) 0%, transparent 50%);
}
.blog-archive-hero > .container {
    position: relative;
    z-index: 1;
}
.blog-archive-hero .section-bg-label {
    text-align: left;
    font-size: clamp(36px, 5.5vw, 80px);
    color: rgba(15, 20, 25, 0.08);
    margin-bottom: 8px;
}
.blog-archive-eyebrow {
    margin-bottom: 18px;
}
.blog-archive-title {
    font-size: clamp(30px, 3.6vw, 48px);
    font-weight: 700;
    line-height: 1.45;
    letter-spacing: 0.02em;
    color: var(--ink);
    margin: 0 0 24px;
}
.blog-archive-lede {
    font-size: 15.5px;
    line-height: 2;
    color: var(--ink-2);
    max-width: 60ch;
    margin: 0;
    font-weight: 500;
}

/* ─────────── 検索 + 件数 ─────────── */
.blog-toolbar {
    margin-top: clamp(40px, 5vw, 56px);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 24px;
    flex-wrap: wrap;
}
.blog-count {
    font-family: "Inter", sans-serif;
    font-size: 11.5px;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--ink-3);
    font-weight: 500;
}
.blog-count strong {
    color: var(--ink);
    font-weight: 700;
    font-size: 14px;
    margin: 0 4px;
}
.blog-search {
    position: relative;
    display: flex;
    align-items: center;
    background: var(--paper);
    border: 1px solid var(--rule);
    padding: 0 14px;
    min-width: 280px;
    transition: border-color 0.2s ease;
}
.blog-search:focus-within {
    border-color: var(--accent);
}
.blog-search svg {
    flex: 0 0 auto;
    color: var(--ink-3);
}
.blog-search input {
    flex: 1;
    appearance: none;
    border: 0;
    background: transparent;
    padding: 13px 8px;
    font-family: inherit;
    font-size: 13.5px;
    color: var(--ink);
    outline: none;
    letter-spacing: 0.02em;
}
.blog-search input::placeholder {
    color: var(--ink-3);
}

/* ─────────── カテゴリフィルタ ─────────── */
.blog-filter {
    background: rgba(255, 255, 255, 0.85);
    border-bottom: 1px solid var(--rule);
    position: sticky;
    top: 92px; /* fixed header(92px) と被らないように */
    z-index: 50;
    backdrop-filter: blur(20px) saturate(140%);
    -webkit-backdrop-filter: blur(20px) saturate(140%);
}
.blog-filter-inner {
    display: flex;
    align-items: center;
    gap: 32px;
    padding: 22px 0;
    overflow-x: auto;
    scrollbar-width: none;
}
.blog-filter-inner::-webkit-scrollbar {
    display: none;
}
.blog-filter-label {
    font-family: "Inter", sans-serif;
    font-size: 10.5px;
    font-weight: 600;
    letter-spacing: 0.24em;
    text-transform: uppercase;
    color: var(--ink-3);
    flex: 0 0 auto;
    padding-right: 24px;
    border-right: 1px solid var(--rule);
}
.blog-filter-list {
    display: flex;
    gap: 4px;
    list-style: none;
    margin: 0;
    padding: 0;
    flex: 1;
    overflow-x: auto;
    scrollbar-width: none;
}
.blog-filter-list::-webkit-scrollbar {
    display: none;
}
.blog-filter-btn {
    appearance: none;
    background: transparent;
    border: 1px solid transparent;
    color: var(--ink-2);
    font-family: inherit;
    font-size: 12.5px;
    font-weight: 500;
    letter-spacing: 0.04em;
    padding: 8px 18px;
    border-radius: 999px;
    cursor: pointer;
    white-space: nowrap;
    transition: all 0.2s ease;
}
.blog-filter-btn:hover {
    color: var(--accent);
}
.blog-filter-btn.is-active {
    background: var(--ink);
    color: var(--paper);
    border-color: var(--ink);
}
.blog-filter-count {
    font-family: "Inter", sans-serif;
    font-size: 10.5px;
    font-weight: 400;
    color: var(--ink-3);
    margin-left: 4px;
    letter-spacing: 0.04em;
}
.blog-filter-btn.is-active .blog-filter-count {
    color: rgba(255, 255, 255, 0.6);
}

/* ─────────── 記事グリッド ─────────── */
.blog-archive-grid-wrap {
    padding: clamp(48px, 6vw, 96px) 0 clamp(56px, 7vw, 96px);
}
.blog-archive-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}
@media (max-width: 980px) {
    .blog-archive-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }
}
@media (max-width: 640px) {
    .blog-archive-grid {
        grid-template-columns: 1fr;
    }
}

.blog-archive-card {
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    background: var(--paper);
    border-radius: 4px;
    overflow: hidden;
    box-shadow:
        0 4px 8px -2px rgba(15, 20, 25, 0.06),
        0 18px 28px -10px rgba(15, 20, 25, 0.16);
    transition:
        transform 0.3s cubic-bezier(0.22, 1, 0.36, 1),
        box-shadow 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}
.blog-archive-card:hover {
    transform: translateY(-6px);
    box-shadow:
        0 6px 12px -3px rgba(15, 20, 25, 0.08),
        0 28px 40px -14px rgba(15, 20, 25, 0.24);
}
.blog-archive-card:hover .blog-archive-card-title {
    color: var(--accent);
}
.blog-archive-card:hover .blog-archive-card-thumb::after {
    transform: scaleX(1);
}
.blog-archive-card-thumb {
    position: relative;
    aspect-ratio: 4 / 3;
    overflow: hidden;
    background: var(--paper-2);
}
.blog-archive-card-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}
.blog-archive-card:hover .blog-archive-card-thumb img {
    transform: scale(1.04);
}
.blog-archive-card-thumb::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 3px;
    background: var(--accent);
    transform: scaleX(0);
    transform-origin: left center;
    transition: transform 0.4s cubic-bezier(0.22, 1, 0.36, 1);
}
.blog-archive-card-body {
    padding: 22px 22px 24px;
    display: flex;
    flex-direction: column;
    flex: 1;
}
.blog-archive-card-meta {
    display: flex;
    gap: 12px;
    align-items: center;
    margin-bottom: 14px;
    font-size: 10.5px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}
.blog-archive-card-meta .cat {
    display: inline-block;
    padding: 4px 10px;
    background: var(--ink);
    color: var(--paper);
    border-radius: 999px;
    letter-spacing: 0.16em;
    font-weight: 600;
    font-size: 10px;
}
.blog-archive-card-meta .date {
    color: var(--ink-3);
    letter-spacing: 0.06em;
    font-family: "Inter", sans-serif;
}
.blog-archive-card-title {
    font-size: 15.5px;
    font-weight: 700;
    line-height: 1.6;
    color: var(--ink);
    margin: 0 0 14px;
    letter-spacing: 0.01em;
    transition: color 0.2s ease;
}
.blog-archive-card-excerpt {
    font-size: 12.5px;
    line-height: 1.85;
    color: var(--ink-2);
    margin: 0 0 18px;
    font-weight: 500;
    /* 3行で省略 */
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.blog-archive-card-foot {
    margin-top: auto;
    padding-top: 14px;
    border-top: 1px solid var(--rule-2);
    display: flex;
    gap: 10px;
    align-items: center;
    font-size: 11.5px;
    color: var(--ink-3);
}
.blog-archive-card-foot .author {
    flex: 1;
    letter-spacing: 0.02em;
}
.blog-archive-card-foot .read {
    font-family: "Inter", sans-serif;
    letter-spacing: 0.06em;
}

/* 空状態 */
.blog-empty {
    grid-column: 1 / -1;
    text-align: center;
    padding: 80px 24px;
    color: var(--ink-3);
    font-size: 14px;
}
.blog-empty strong {
    display: block;
    margin-bottom: 8px;
    font-size: 16px;
    color: var(--ink);
}

/* ─────────── ページネーション ─────────── */
.blog-pagination {
    margin-top: clamp(56px, 7vw, 80px);
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 6px;
    flex-wrap: wrap;
}
.blog-pagination > a,
.blog-pagination > span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 40px;
    padding: 0 14px;
    font-family: "Inter", sans-serif;
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 0.04em;
    color: var(--ink-2);
    text-decoration: none;
    border: 1px solid var(--rule);
    background: var(--paper);
    transition: all 0.2s ease;
    border-radius: 999px;
}
.blog-pagination a:hover {
    color: var(--accent);
    border-color: var(--accent);
}
.blog-pagination .is-current {
    background: var(--ink);
    color: var(--paper);
    border-color: var(--ink);
    cursor: default;
}
.blog-pagination .gap {
    border: 0;
    background: transparent;
    color: var(--ink-3);
    padding: 0 4px;
    min-width: auto;
}
.blog-pagination .nav-prev,
.blog-pagination .nav-next {
    gap: 8px;
    padding: 0 18px;
}
.blog-pagination .nav-disabled {
    opacity: 0.35;
    pointer-events: none;
}

/* ─────────── 記事下お問い合わせCTA(article.htmlと共通スタイル) ─────────── */
.blog-contact {
    position: relative;
    overflow: hidden;
    color: var(--paper);
    padding: clamp(96px, 14vw, 160px) 0;
    background:
        radial-gradient(circle at 18% 22%, rgba(56, 189, 248, 0.18) 0%, transparent 50%),
        radial-gradient(circle at 82% 78%, rgba(139, 92, 246, 0.18) 0%, transparent 55%),
        linear-gradient(135deg, #0B1426 0%, #1a2b5e 50%, #0B1426 100%);
}
.blog-contact > .container-narrow {
    position: relative;
    z-index: 1;
    text-align: center;
}
.blog-contact .eyebrow,
.blog-contact .eyebrow .jp {
    color: var(--paper);
    justify-content: center;
}
.blog-contact .eyebrow::before {
    background: rgba(255, 255, 255, 0.4);
}
.blog-contact .section-bg-label {
    font-size: clamp(32px, 4vw, 60px);
    color: rgba(255, 255, 255, 0.10);
}
.blog-contact h2 {
    font-size: clamp(28px, 3.6vw, 44px);
    font-weight: 700;
    line-height: 1.5;
    letter-spacing: 0.02em;
    margin: 32px auto 24px;
    color: var(--paper);
    max-width: 22ch;
}
.blog-contact-lede {
    font-size: 14.5px;
    line-height: 2;
    color: rgba(255, 255, 255, 0.75);
    max-width: 52ch;
    margin: 0 auto 48px;
    font-weight: 500;
}
.blog-contact .btn-final-cta {
    display: inline-flex;
    align-items: center;
    gap: 14px;
    background: linear-gradient(135deg, #1d4ed8 0%, #2563eb 50%, #1e40af 100%);
    color: #fff;
    padding: 20px 44px;
    font-size: 15px;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-decoration: none;
    border: 0;
    border-radius: 9999px;
    transition: transform 0.25s ease, background 0.25s ease;
}
.blog-contact .btn-final-cta:hover {
    transform: translateY(-2px);
    background: linear-gradient(135deg, #2563eb 0%, #3b82f6 50%, #2563eb 100%);
}

/* ─────────── レスポンシブ ─────────── */
@media (max-width: 740px) {
    .blog-toolbar {
        flex-direction: column;
        align-items: stretch;
    }
    .blog-search {
        min-width: 0;
        width: 100%;
    }
    .blog-filter {
        top: 76px;
    }
    .blog-filter-label {
        display: none;
    }
    .blog-pagination .nav-prev .label,
    .blog-pagination .nav-next .label {
        display: none;
    }
}