/* =========================================================
   Karteo™ - Article Page Stylesheet
   (shared by column/*.html and news/index.html)
   ========================================================= */

:root {
  --c-white: #ffffff;
  --c-light-gray: #f5f7fa;
  --c-light-bluegray: #eef2f7;
  --c-blue: #1a6bcc;
  --c-navy: #1a2a4a;
  --c-navy-2: #243a66;
  --c-gold: #b8860b;
  --c-text: #1f2a3c;
  --c-text-sub: #4a5568;
  --c-text-mute: #7a8699;
  --c-border: #e2e8f0;
  --c-border-strong: #cbd5e0;

  --shadow-sm: 0 1px 2px rgba(26,42,74,.05);
  --shadow-md: 0 4px 16px rgba(26,42,74,.08);

  --font-serif: "Noto Serif JP", "Yu Mincho", serif;
  --font-sans: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--c-text);
  background: var(--c-light-gray);
  line-height: 1.85;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a { color: var(--c-blue); text-decoration: none; transition: color .2s ease; }
a:hover { color: var(--c-navy); }
ul, ol { padding-left: 1.4em; margin: 0 0 20px; }
img { max-width: 100%; display: block; }
h1, h2, h3, h4, p { margin: 0; }

/* ---------- Header ---------- */
.site-header {
  background: rgba(255,255,255,.96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--c-border);
  position: sticky;
  top: 0;
  z-index: 10;
  box-shadow: var(--shadow-sm);
}
.site-header__inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.site-header .logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--c-navy);
}
.site-header .logo-mark {
  width: 32px; height: 32px;
  border-radius: 7px;
  background: linear-gradient(135deg, var(--c-blue), var(--c-navy));
  color: #fff;
  display: grid; place-items: center;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 15px;
  box-shadow: 0 2px 6px rgba(26,107,204,.25);
}
.site-header .logo-wordmark {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  line-height: 1;
}
.site-header .logo-text {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 18px;
  color: var(--c-navy);
  letter-spacing: .03em;
  line-height: 1;
}
.site-header .logo-text sup { font-size: .5em; color: var(--c-blue); vertical-align: super; margin-left: 1px; }
.site-header .logo-divider {
  display: inline-block;
  width: 1px;
  height: 13px;
  background: var(--c-border-strong);
  transform: translateY(1px);
}
.site-header .logo-sub {
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 500;
  color: var(--c-text-mute);
  letter-spacing: .18em;
  line-height: 1;
}
.site-header__nav {
  display: flex;
  gap: 8px;
  align-items: center;
}
.site-header__nav a {
  padding: 8px 14px;
  font-size: 13px;
  color: var(--c-text-sub);
  font-weight: 500;
  border-radius: 6px;
  letter-spacing: .04em;
}
.site-header__nav a:hover { background: var(--c-light-bluegray); color: var(--c-blue); }
.site-header__cta {
  height: 38px;
  padding: 0 18px;
  background: var(--c-blue);
  color: #fff !important;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .04em;
  display: inline-flex; align-items: center;
}
.site-header__cta:hover { background: var(--c-navy); color: #fff !important; }

/* ---------- Page hero ---------- */
.page-hero {
  background:
    radial-gradient(ellipse 60% 50% at 85% 15%, rgba(26,107,204,.06) 0%, transparent 60%),
    linear-gradient(180deg, #f8fafc 0%, var(--c-light-bluegray) 100%);
  padding: 64px 0 48px;
  border-bottom: 1px solid var(--c-border);
}
.page-hero__inner {
  max-width: 820px;
  margin: 0 auto;
  padding: 0 24px;
}
.crumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--c-text-mute);
  margin-bottom: 20px;
  letter-spacing: .04em;
  flex-wrap: wrap;
}
.crumbs a { color: var(--c-text-mute); }
.crumbs a:hover { color: var(--c-blue); }
.crumbs .sep { opacity: .5; }
.eyebrow {
  display: inline-block;
  font-size: 12px;
  letter-spacing: .22em;
  color: var(--c-blue);
  font-weight: 600;
  margin-bottom: 14px;
  text-transform: uppercase;
}

/* ---------- Article layout ---------- */
.article-wrap {
  max-width: 820px;
  margin: 0 auto;
  padding: 56px 24px 80px;
}
.article-meta {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 20px;
  font-size: 12px;
  color: var(--c-text-mute);
  letter-spacing: .06em;
}
.article-meta .date {
  font-family: var(--font-serif);
  font-size: 13px;
}
.article-meta .tag {
  display: inline-flex;
  align-items: center;
  height: 22px;
  padding: 0 10px;
  background: var(--c-navy);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  border-radius: 4px;
  letter-spacing: .06em;
}
.article-title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(24px, 3.2vw, 34px);
  line-height: 1.55;
  color: var(--c-navy);
  letter-spacing: .03em;
  margin-bottom: 24px;
}
.article-lead {
  font-size: 15.5px;
  line-height: 1.95;
  color: var(--c-text-sub);
}

.article-body {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: 8px;
  padding: 48px;
  box-shadow: var(--shadow-sm);
  margin-top: 40px;
}
.article-body h2 {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 20px;
  color: var(--c-navy);
  letter-spacing: .03em;
  line-height: 1.55;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--c-blue);
  display: inline-block;
  margin: 40px 0 20px;
}
.article-body h2:first-child { margin-top: 0; }
.article-body h3 {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 16px;
  color: var(--c-navy);
  letter-spacing: .02em;
  margin: 28px 0 12px;
}
.article-body p {
  font-size: 14.5px;
  line-height: 1.95;
  color: var(--c-text);
  margin-bottom: 18px;
}
.article-body ul, .article-body ol {
  font-size: 14.5px;
  line-height: 1.95;
  color: var(--c-text);
  margin-bottom: 20px;
}
.article-body li { margin-bottom: 6px; }
.article-body strong { font-weight: 700; color: var(--c-navy); }
.article-body blockquote {
  margin: 20px 0;
  padding: 16px 20px;
  background: var(--c-light-bluegray);
  border-left: 3px solid var(--c-blue);
  border-radius: 4px;
  font-size: 14px;
  color: var(--c-text-sub);
  line-height: 1.9;
}

/* ---------- Article nav (prev/next + back) ---------- */
.article-nav {
  max-width: 820px;
  margin: 0 auto;
  padding: 0 24px 64px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 22px;
  border-radius: 8px;
  font-family: inherit;
  font-size: 13.5px;
  font-weight: 700;
  letter-spacing: .06em;
  text-decoration: none;
  border: none;
  transition: background .2s ease, transform .1s ease, color .2s ease, border-color .2s ease;
}
.btn--primary { background: var(--c-blue); color: #fff; }
.btn--primary:hover { background: var(--c-navy); color: #fff; }
.btn--ghost { background: #fff; color: var(--c-navy); border: 1px solid var(--c-border-strong); }
.btn--ghost:hover { border-color: var(--c-blue); color: var(--c-blue); }

/* ---------- List page (column/news index) ---------- */
.list-wrap {
  max-width: 820px;
  margin: 0 auto;
  padding: 56px 24px 80px;
}
.list-title-block { margin-bottom: 40px; }
.list-title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(28px, 3.6vw, 38px);
  color: var(--c-navy);
  letter-spacing: .03em;
  line-height: 1.4;
  margin-bottom: 16px;
}
.list-title-block p {
  font-size: 14.5px;
  line-height: 1.95;
  color: var(--c-text-sub);
  max-width: 620px;
}

.list-items {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.list-item {
  display: flex;
  gap: 24px;
  padding: 22px 28px;
  border-bottom: 1px solid var(--c-border);
  text-decoration: none;
  color: inherit;
  transition: background .15s ease;
  align-items: center;
}
.list-item:last-child { border-bottom: none; }
.list-item:hover { background: var(--c-light-gray); color: inherit; }
.list-item__date {
  flex-shrink: 0;
  width: 100px;
  font-family: var(--font-serif);
  font-size: 13px;
  color: var(--c-text-mute);
  letter-spacing: .08em;
}
.list-item__tag {
  flex-shrink: 0;
  width: 96px;
}
.list-item__tag .tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 22px;
  padding: 0 10px;
  background: var(--c-blue);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  border-radius: 4px;
  letter-spacing: .06em;
}
.list-item__tag .tag--info { background: var(--c-navy); }
.list-item__tag .tag--recruit { background: var(--c-gold); }
.list-item__title {
  flex: 1;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--c-text);
  font-weight: 500;
  letter-spacing: .02em;
}
.list-item__arrow {
  flex-shrink: 0;
  color: var(--c-text-mute);
  font-size: 14px;
  transition: transform .2s ease, color .2s ease;
}
.list-item:hover .list-item__arrow { color: var(--c-blue); transform: translateX(4px); }

/* ---------- CTA card (footer of article) ---------- */
.cta-card {
  max-width: 820px;
  margin: 0 auto 48px;
  padding: 32px;
  background: linear-gradient(135deg, var(--c-navy), #0f1a35);
  color: #fff;
  border-radius: 8px;
  text-align: center;
  box-shadow: var(--shadow-md);
}
.cta-card h3 {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: .04em;
}
.cta-card p {
  font-size: 13.5px;
  color: rgba(255,255,255,.8);
  margin-bottom: 24px;
  line-height: 1.9;
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
}
.cta-card .btn {
  background: var(--c-gold);
  color: #fff;
}
.cta-card .btn:hover { background: #a07609; color: #fff; }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--c-navy);
  color: rgba(255,255,255,.7);
  padding: 40px 0;
  font-size: 13px;
}
.site-footer__inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
.site-footer .footer-logo {
  display: inline-flex;
  align-items: baseline;
  gap: 12px;
}
.site-footer .footer-logo-text {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 18px;
  color: #fff;
  letter-spacing: .03em;
  line-height: 1;
}
.site-footer .footer-logo-text sup { font-size: .5em; color: var(--c-blue); vertical-align: super; margin-left: 2px; }
.site-footer .footer-logo-divider {
  display: inline-block;
  width: 1px;
  height: 12px;
  background: rgba(255,255,255,.25);
  transform: translateY(1px);
}
.site-footer .footer-logo-sub {
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 500;
  color: rgba(255,255,255,.6);
  letter-spacing: .2em;
  line-height: 1;
}
.site-footer__meta {
  font-size: 11.5px;
  color: rgba(255,255,255,.5);
  letter-spacing: .04em;
}
.site-footer__meta a { color: rgba(255,255,255,.75); margin-left: 16px; }
.site-footer__meta a:hover { color: #fff; }

@media (max-width: 720px) {
  .site-header__nav a:not(.site-header__cta) { display: none; }
  .article-wrap, .list-wrap { padding: 40px 20px 60px; }
  .article-body { padding: 28px 22px; }
  .list-item { padding: 16px 20px; flex-wrap: wrap; gap: 8px; }
  .list-item__date { width: auto; }
  .list-item__tag { width: auto; }
  .list-item__title { width: 100%; padding-top: 4px; }
  .list-item__arrow { display: none; }
  .article-nav { flex-direction: column; align-items: stretch; }
  .article-nav .btn { width: 100%; }
  .site-footer__inner { flex-direction: column; align-items: flex-start; }
}