/* ============================================================
 *  KT CLINIC — Phase 3-C コラム関連 CSS
 *  archive-column.php / single-column.php 共通スタイル
 *
 *  Phase 3-C / 2026-05-25
 *  - .kt-column スコープ
 *  - カテゴリ色を3軸（婦人科ピンク/皮膚科ミント/形成・美容ゴールド）でマッピング
 * ============================================================ */

.kt-column {
    --c-text: #1A1F2E;
    --c-sub: #2A3142;
    --c-meta: #5A6373;
    --c-light: #888;
    --c-border: #E8EAED;
    --c-border-soft: #F0F1F3;
    --c-bg-soft: #F7F8FA;
    --c-bg-softer: #FAFAFA;

    --c-gyn: #E08AA0;
    --c-gyn-deep: #C16A82;
    --c-gyn-soft: #FBECF0;
    --c-derm: #7DC9A8;
    --c-derm-deep: #56AC85;
    --c-derm-soft: #E8F6EE;
    --c-cos: #C9A96E;
    --c-cos-deep: #9C7E47;
    --c-cos-soft: #F7F1E3;

    --font-sans: 'Noto Sans JP', sans-serif;
    --font-serif: 'Noto Serif JP', serif;
    --font-en: 'Inter', sans-serif;

    color: var(--c-text);
    font-family: var(--font-sans);
    font-weight: 400;
    line-height: 1.8;
}

.kt-column *, .kt-column *::before, .kt-column *::after { box-sizing: border-box; }
.kt-column a { color: inherit; text-decoration: none; }
.kt-column img { display: block; max-width: 100%; height: auto; }
.kt-column ul { padding: 0; margin: 0; }

/* ============================================================
 *  カテゴリ色（共通）
 *  バッジ（薄背景＋濃色文字）— アーカイブ・記事・関連で共通
 * ============================================================ */
.kt-column-card-cat {
    display: inline-block;
    font-family: var(--font-en);
    font-size: 10px;
    padding: 4px 10px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    margin: 0;
}
.kt-column-card-cat--gyn  { background: var(--c-gyn-soft);  color: var(--c-gyn-deep); }
.kt-column-card-cat--derm { background: var(--c-derm-soft); color: var(--c-derm-deep); }
.kt-column-card-cat--cos  { background: var(--c-cos-soft);  color: var(--c-cos-deep); }
.kt-column-card-cat--default { background: var(--c-bg-soft); color: var(--c-sub); }

/* ============================================================
 *  Archive: HERO
 * ============================================================ */
.kt-column-archive-hero {
    padding: 96px 64px 56px;
    text-align: center;
    background: linear-gradient(180deg, var(--c-bg-softer) 0%, #fff 100%);
}
.kt-column-eyebrow {
    font-family: var(--font-en);
    font-size: 11px;
    letter-spacing: 0.3em;
    color: var(--c-cos-deep);
    text-transform: uppercase;
    margin: 0 0 16px;
}
.kt-column-archive-title {
    font-size: 36px;
    font-weight: 300;
    color: var(--c-text);
    margin: 0 0 16px;
    letter-spacing: 0.05em;
}
.kt-column-archive-subtitle {
    font-size: 14px;
    color: var(--c-sub);
    line-height: 1.9;
    margin: 0;
}

/* ============================================================
 *  Archive: CATEGORY TABS
 * ============================================================ */
.kt-column-tabs-wrap {
    padding: 0 64px 56px;
    background: #fff;
}
.kt-column-tabs {
    max-width: 1280px;
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
    border-bottom: 0.5px solid var(--c-border);
    padding-bottom: 16px;
}
.kt-column-tab {
    padding: 10px 22px;
    font-size: 13px;
    color: var(--c-text);
    letter-spacing: 0.05em;
    border: 0.5px solid var(--c-border);
    background: #fff;
    border-radius: 100px;
    transition: all 0.2s;
}
.kt-column-tab:hover {
    border-color: var(--c-cos);
    color: var(--c-cos-deep);
}
.kt-column-tab.is-active {
    background: var(--c-text);
    color: #fff;
    border-color: var(--c-text);
    font-weight: 500;
}
/* カテゴリ別の hover/active 色 */
.kt-column-tab--gyn:hover  { border-color: var(--c-gyn);  color: var(--c-gyn-deep); }
.kt-column-tab--gyn.is-active { background: var(--c-gyn); border-color: var(--c-gyn); color: #fff; }
.kt-column-tab--derm:hover { border-color: var(--c-derm); color: var(--c-derm-deep); }
.kt-column-tab--derm.is-active { background: var(--c-derm); border-color: var(--c-derm); color: #fff; }
.kt-column-tab--cos:hover  { border-color: var(--c-cos);  color: var(--c-cos-deep); }
.kt-column-tab--cos.is-active { background: var(--c-cos); border-color: var(--c-cos); color: #fff; }

/* ============================================================
 *  Archive: COLUMN LIST GRID
 * ============================================================ */
.kt-column-list-section {
    padding: 80px 64px 120px;
    background: var(--c-bg-softer);
}
.kt-column-grid {
    max-width: 1280px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}
.kt-column-card {
    background: #fff;
    border: 0.5px solid var(--c-border);
    display: flex;
    flex-direction: column;
    transition: transform 0.3s, box-shadow 0.3s;
}
.kt-column-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 30px rgba(26, 31, 46, 0.08);
}
.kt-column-card-img {
    aspect-ratio: 16/10;
    background: linear-gradient(135deg, var(--c-bg-soft) 0%, var(--c-cos-soft) 100%);
    overflow: hidden;
}
.kt-column-card-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.kt-column-card-body {
    padding: 24px 24px 28px;
    display: flex;
    flex-direction: column;
    flex: 1;
}
.kt-column-card-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}
.kt-column-card-date {
    font-family: var(--font-en);
    font-size: 11px;
    color: var(--c-light);
    letter-spacing: 0.05em;
}
.kt-column-card-title {
    font-size: 16px;
    font-weight: 500;
    color: var(--c-text);
    margin: 0 0 12px;
    line-height: 1.6;
    letter-spacing: 0.02em;
}
.kt-column-card-excerpt {
    font-size: 13px;
    color: var(--c-sub);
    line-height: 1.9;
    margin: 0 0 16px;
    flex: 1;
}
.kt-column-card-cta {
    font-size: 12px;
    color: var(--c-cos-deep);
    letter-spacing: 0.1em;
    font-family: var(--font-en);
    margin-top: auto;
}

.kt-column-pagination {
    max-width: 1280px;
    margin: 56px auto 0;
    text-align: center;
}
.kt-column-empty {
    text-align: center;
    color: var(--c-sub);
    padding: 80px 0;
}

/* ============================================================
 *  Single: HEADER
 * ============================================================ */
.kt-column-single {
    background: #fff;
}
.kt-column-single-header {
    max-width: 800px;
    margin: 0 auto;
    padding: 96px 32px 32px;
    text-align: center;
    border-bottom: 0.5px solid var(--c-border);
}
.kt-column-single-meta {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 14px;
    margin-bottom: 24px;
}
.kt-column-single-date {
    font-family: var(--font-en);
    font-size: 12px;
    color: var(--c-meta);
    letter-spacing: 0.1em;
}
.kt-column-single-title {
    font-size: 32px;
    font-weight: 500;
    color: var(--c-text);
    line-height: 1.6;
    letter-spacing: 0.03em;
    margin: 0;
}

/* ============================================================
 *  Single: THUMBNAIL
 * ============================================================ */
.kt-column-single-thumbnail {
    max-width: 900px;
    margin: 56px auto 0;
}
.kt-column-single-thumbnail img {
    width: 100%;
    height: auto;
}

/* ============================================================
 *  Single: BODY
 * ============================================================ */
.kt-column-single-body {
    padding: 56px 32px 80px;
}
.kt-column-single-content {
    max-width: 760px;
    margin: 0 auto;
    font-size: 16px;
    line-height: 2;
    color: var(--c-text);
}
.kt-column-single-content h2 {
    font-size: 24px;
    font-weight: 500;
    color: var(--c-text);
    margin: 48px 0 20px;
    padding: 16px 0 16px 16px;
    border-left: 3px solid var(--c-cos);
    letter-spacing: 0.05em;
    line-height: 1.6;
}
.kt-column-single-content h3 {
    font-size: 19px;
    font-weight: 500;
    color: var(--c-text);
    margin: 36px 0 16px;
    padding-bottom: 8px;
    border-bottom: 0.5px solid var(--c-border);
    letter-spacing: 0.05em;
}
.kt-column-single-content h4 {
    font-size: 16px;
    font-weight: 500;
    color: var(--c-text);
    margin: 28px 0 12px;
    letter-spacing: 0.03em;
}
.kt-column-single-content p {
    margin: 0 0 24px;
    color: var(--c-sub);
}
.kt-column-single-content a {
    color: var(--c-cos-deep);
    text-decoration: underline;
    text-underline-offset: 3px;
}
.kt-column-single-content ul,
.kt-column-single-content ol {
    margin: 0 0 24px;
    padding-left: 28px;
    color: var(--c-sub);
}
.kt-column-single-content li {
    margin-bottom: 8px;
    line-height: 1.9;
}
.kt-column-single-content blockquote {
    margin: 32px 0;
    padding: 24px 28px;
    background: var(--c-bg-softer);
    border-left: 3px solid var(--c-cos);
    color: var(--c-sub);
    font-size: 15px;
    line-height: 1.9;
}
.kt-column-single-content img {
    margin: 32px auto;
    border-radius: 4px;
}
.kt-column-single-content strong {
    color: var(--c-text);
    font-weight: 500;
}

/* ============================================================
 *  Single: RELATED COLUMNS
 * ============================================================ */
.kt-column-related {
    max-width: 1000px;
    margin: 0 auto;
    padding: 56px 32px;
    border-top: 0.5px solid var(--c-border);
}
.kt-column-related-title {
    text-align: center;
    font-size: 20px;
    font-weight: 500;
    color: var(--c-text);
    letter-spacing: 0.1em;
    margin: 0 0 32px;
}
.kt-column-related-title::before {
    content: 'Related —';
    display: block;
    font-family: var(--font-en);
    font-size: 11px;
    letter-spacing: 0.3em;
    color: var(--c-cos-deep);
    text-transform: uppercase;
    margin-bottom: 8px;
    font-weight: 400;
}
.kt-column-related-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.kt-column-related-card {
    display: flex;
    flex-direction: column;
    transition: opacity 0.2s;
}
.kt-column-related-card:hover { opacity: 0.85; }
.kt-column-related-img {
    aspect-ratio: 16/10;
    background: var(--c-bg-soft);
    margin-bottom: 16px;
    overflow: hidden;
}
.kt-column-related-img img { width: 100%; height: 100%; object-fit: cover; }
.kt-column-related-body { display: flex; flex-direction: column; gap: 8px; }
.kt-column-related-body time {
    font-family: var(--font-en);
    font-size: 11px;
    color: var(--c-light);
    letter-spacing: 0.05em;
}
.kt-column-related-body h4 {
    font-size: 14px;
    font-weight: 500;
    color: var(--c-text);
    line-height: 1.6;
    margin: 0;
    letter-spacing: 0.02em;
}

/* ============================================================
 *  Single: PREV / NEXT NAV
 * ============================================================ */
.kt-column-single-nav {
    max-width: 900px;
    margin: 0 auto;
    padding: 32px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    border-top: 0.5px solid var(--c-border);
}
.kt-column-single-nav-item:last-child { text-align: right; }
.kt-column-single-nav-link {
    display: inline-block;
    transition: opacity 0.2s;
}
.kt-column-single-nav-link:hover { opacity: 0.7; }
.kt-column-single-nav-label {
    display: block;
    font-family: var(--font-en);
    font-size: 11px;
    color: var(--c-meta);
    letter-spacing: 0.15em;
    margin-bottom: 6px;
}
.kt-column-single-nav-title {
    display: block;
    font-size: 13px;
    color: var(--c-text);
    line-height: 1.6;
    letter-spacing: 0.02em;
}

/* ============================================================
 *  Single: BACK TO LIST
 * ============================================================ */
.kt-column-single-back {
    text-align: center;
    padding: 0 32px 80px;
    margin: 0;
}
.kt-column-back-link {
    display: inline-block;
    padding: 14px 32px;
    border: 0.5px solid var(--c-text);
    color: var(--c-text);
    font-size: 13px;
    letter-spacing: 0.1em;
    border-radius: 2px;
    transition: all 0.2s;
}
.kt-column-back-link:hover {
    background: var(--c-text);
    color: #fff;
}

/* ============================================================
 *  CTA（無料カウンセリング訴求なし）
 * ============================================================ */
.kt-column-cta {
    padding: 80px 64px;
    background: linear-gradient(135deg, #1A1F2E 0%, #2A3142 100%);
    text-align: center;
    color: #fff;
}
.kt-column-cta-label {
    font-family: var(--font-en);
    font-size: 11px;
    letter-spacing: 0.3em;
    color: var(--c-cos);
    text-transform: uppercase;
    margin: 0 0 16px;
}
.kt-column-cta h2 {
    font-size: 28px;
    font-weight: 300;
    color: #fff;
    margin: 0 0 16px;
    letter-spacing: 0.05em;
    line-height: 1.6;
}
.kt-column-cta p {
    font-size: 14px;
    line-height: 1.9;
    color: rgba(255, 255, 255, 0.85);
    margin: 0 0 32px;
}
.kt-column-cta-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
}
.kt-column-cta-btn {
    padding: 14px 36px;
    font-size: 13px;
    letter-spacing: 0.15em;
    border-radius: 2px;
    transition: opacity 0.2s;
}
.kt-column-cta-btn:hover { opacity: 0.88; }
.kt-column-cta-btn--primary {
    background: var(--c-cos);
    color: var(--c-text);
}
.kt-column-cta-btn--tel {
    background: rgba(255, 255, 255, 0.12);
    color: #fff;
    border: 0.5px solid rgba(255, 255, 255, 0.4);
}

/* ============================================================
 *  Responsive
 * ============================================================ */
@media (max-width: 1024px) {
    .kt-column-archive-hero { padding: 64px 40px 40px; }
    .kt-column-tabs-wrap { padding: 0 40px 40px; }
    .kt-column-list-section { padding: 56px 40px 80px; }
    .kt-column-grid { grid-template-columns: repeat(2, 1fr); gap: 24px; }
    .kt-column-related { padding: 40px 24px; }
    .kt-column-related-grid { grid-template-columns: repeat(2, 1fr); }
    .kt-column-cta { padding: 64px 40px; }
}

@media (max-width: 768px) {
    .kt-column-archive-hero { padding: 48px 20px 32px; }
    .kt-column-archive-title { font-size: 28px; }
    .kt-column-tabs-wrap { padding: 0 20px 32px; }
    .kt-column-list-section { padding: 40px 20px 64px; }
    .kt-column-grid { grid-template-columns: 1fr; gap: 20px; }

    .kt-column-single-header { padding: 56px 20px 24px; }
    .kt-column-single-title { font-size: 22px; }
    .kt-column-single-thumbnail { margin-top: 32px; padding: 0 20px; }
    .kt-column-single-body { padding: 40px 20px 56px; }
    .kt-column-single-content { font-size: 15px; }
    .kt-column-single-content h2 { font-size: 20px; }
    .kt-column-single-content h3 { font-size: 17px; }

    .kt-column-related { padding: 32px 20px; }
    .kt-column-related-grid { grid-template-columns: 1fr; }

    .kt-column-single-nav { grid-template-columns: 1fr; padding: 24px 20px; gap: 16px; }
    .kt-column-single-nav-item:last-child { text-align: left; }

    .kt-column-cta { padding: 48px 20px; }
    .kt-column-cta h2 { font-size: 22px; }
    .kt-column-cta-buttons { flex-direction: column; }
    .kt-column-cta-btn { width: 100%; }
}