/* PROST AI実装ログ — Static media styles */
:root {
  --color-bg: #f7f8f6;
  --color-surface: #ffffff;
  --color-ink: #111827;
  --color-text: #20242a;
  --color-text-sub: #5c6470;
  --color-accent: #0f766e;
  --color-accent-strong: #0b4f4a;
  --color-accent-light: #e6f3ef;
  --color-blue: #1d4ed8;
  --color-warm: #b45309;
  --color-warm-light: #fff7ed;
  --color-border: #d9ded7;
  --color-link: #0f766e;
  --font-sans: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic", sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  --max-width: 760px;
  --sidebar-width: 280px;
  --wide-width: 1120px;
}

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

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.8;
  font-size: 16px;
}

a { color: var(--color-link); text-decoration: none; }
a:hover { text-decoration: underline; }

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

/* ヘッダー */
.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 0 24px;
  position: sticky;
  top: 0;
  z-index: 10;
}
.site-header__inner {
  max-width: var(--wide-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}
.site-header__logo {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-ink);
  white-space: nowrap;
}
.site-header__logo span { color: var(--color-accent); }
.site-header__nav {
  display: flex;
  align-items: center;
  gap: 18px;
}
.site-header__nav a {
  font-size: 0.875rem;
  color: var(--color-text-sub);
}

/* メインレイアウト */
.page-wrapper {
  max-width: var(--wide-width);
  margin: 0 auto;
  padding: 40px 24px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

@media (min-width: 900px) {
  .page-wrapper {
    grid-template-columns: var(--max-width) var(--sidebar-width);
    gap: 48px;
  }
}

/* 記事一覧ページ */
.home-main {
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.hero {
  display: grid;
  gap: 28px;
  align-items: center;
  padding: 8px 0 12px;
}

@media (min-width: 900px) {
  .hero {
    grid-template-columns: minmax(0, 1.05fr) minmax(280px, 0.95fr);
  }
}

.hero__kicker {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 12px;
}

.hero__title {
  color: var(--color-ink);
  font-size: 2.15rem;
  font-weight: 800;
  line-height: 1.35;
  margin-bottom: 16px;
}

.hero__lead {
  color: var(--color-text-sub);
  font-size: 1rem;
  line-height: 1.85;
  margin-bottom: 22px;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 10px 16px;
  border-radius: 6px;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-ink);
  font-size: 0.9rem;
  font-weight: 700;
}
.btn:hover { text-decoration: none; border-color: var(--color-accent); }
.btn--primary {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}
.btn--primary:hover { background: var(--color-accent-strong); color: #fff; }

.hero__media {
  aspect-ratio: 4 / 3;
  overflow: hidden;
  border-radius: 8px;
  border: 1px solid var(--color-border);
  background: #eef1ed;
}
.hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.proof-strip {
  display: grid;
  gap: 10px;
  grid-template-columns: 1fr;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding: 16px 0;
}
@media (min-width: 720px) {
  .proof-strip { grid-template-columns: repeat(3, 1fr); }
}
.proof-strip__item {
  font-size: 0.86rem;
  color: var(--color-text-sub);
}
.proof-strip__item strong {
  display: block;
  color: var(--color-ink);
  font-size: 0.95rem;
  margin-bottom: 3px;
}

.section-title {
  color: var(--color-ink);
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 14px;
}

.pillar-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}
@media (min-width: 720px) {
  .pillar-grid { grid-template-columns: repeat(2, 1fr); }
}
.pillar {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 18px;
}
.pillar__label {
  color: var(--color-warm);
  font-size: 0.76rem;
  font-weight: 800;
  margin-bottom: 8px;
}
.pillar__title {
  color: var(--color-ink);
  font-size: 1rem;
  font-weight: 800;
  margin-bottom: 6px;
}
.pillar__body {
  color: var(--color-text-sub);
  font-size: 0.88rem;
  line-height: 1.65;
}

.page-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 32px;
  color: var(--color-text);
}

.post-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.post-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 24px;
  transition: box-shadow 0.15s;
}
.post-card:hover { box-shadow: 0 4px 16px rgba(0,0,0,0.08); }
.post-card--featured {
  border-color: rgba(15,118,110,0.4);
  background: linear-gradient(180deg, #ffffff 0%, #f4fbf8 100%);
}

.post-card__date {
  font-size: 0.8rem;
  color: var(--color-text-sub);
  margin-bottom: 8px;
}

.post-card__title {
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1.5;
  margin-bottom: 10px;
}
.post-card__title a { color: var(--color-text); }
.post-card__title a:hover { color: var(--color-accent); text-decoration: none; }

.post-card__excerpt {
  font-size: 0.9rem;
  color: var(--color-text-sub);
  line-height: 1.65;
}
.post-card__link {
  display: inline-block;
  margin-top: 12px;
  font-size: 0.85rem;
  font-weight: 700;
}

/* 記事ページ */
.article-header {
  margin-bottom: 36px;
}

.article-breadcrumb {
  font-size: 0.8rem;
  color: var(--color-text-sub);
  margin-bottom: 16px;
}
.article-breadcrumb a { color: var(--color-text-sub); }
.article-breadcrumb span { margin: 0 6px; }

.article-title {
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.45;
  margin-bottom: 12px;
}

.article-meta {
  font-size: 0.8rem;
  color: var(--color-text-sub);
  display: flex;
  gap: 16px;
  align-items: center;
}

.article-keywords {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 16px;
}
.article-keywords__tag {
  font-size: 0.75rem;
  background: var(--color-accent-light);
  color: var(--color-accent);
  border-radius: 4px;
  padding: 2px 8px;
}

/* 記事本文 */
.article-body {
  color: var(--color-text);
  font-size: 1rem;
  line-height: 1.9;
}

.article-body h2 {
  font-size: 1.35rem;
  font-weight: 700;
  margin: 48px 0 20px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-accent);
  color: var(--color-text);
}

.article-body h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin: 32px 0 12px;
  color: var(--color-text);
}

.article-body p { margin: 0 0 18px; }

.article-body ul, .article-body ol {
  margin: 0 0 18px 24px;
}
.article-body li { margin-bottom: 6px; }

.article-body strong { font-weight: 700; }
.article-body em { font-style: italic; }

.article-body blockquote {
  border-left: 4px solid var(--color-accent);
  background: var(--color-accent-light);
  padding: 12px 20px;
  margin: 24px 0;
  border-radius: 0 4px 4px 0;
  font-size: 0.95rem;
}

.article-body code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: #f0f0ea;
  padding: 2px 5px;
  border-radius: 3px;
}

.article-body pre {
  background: #1e1e1e;
  color: #d4d4d4;
  padding: 20px;
  border-radius: 6px;
  overflow-x: auto;
  margin: 24px 0;
}
.article-body pre code {
  background: none;
  padding: 0;
  font-size: 0.875rem;
}

.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 0.9rem;
}
.article-body th, .article-body td {
  border: 1px solid var(--color-border);
  padding: 10px 14px;
  text-align: left;
}
.article-body th { background: var(--color-accent-light); font-weight: 700; }
.article-body tr:nth-child(even) td { background: #f8f8f5; }

.article-body hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 40px 0;
}

/* CTAセクション */
.cta-section {
  background: var(--color-accent);
  color: #fff;
  border-radius: 10px;
  padding: 32px 28px;
  margin-top: 48px;
  text-align: center;
}
.cta-section__title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 14px;
}
.cta-section__text {
  font-size: 0.925rem;
  line-height: 1.8;
  margin-bottom: 20px;
  opacity: 0.95;
}
.cta-section__btn {
  display: inline-block;
  background: #fff;
  color: var(--color-accent);
  font-weight: 700;
  font-size: 0.95rem;
  padding: 12px 28px;
  border-radius: 6px;
  text-decoration: none;
  transition: opacity 0.15s;
}
.cta-section__btn:hover { opacity: 0.88; text-decoration: none; }

/* 関連記事 */
.related-posts {
  margin-top: 48px;
}
.related-posts__title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}
.related-posts__list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.related-posts__item a {
  display: block;
  font-size: 0.9rem;
  color: var(--color-link);
  padding: 10px 0;
  border-bottom: 1px solid var(--color-border);
}
.related-posts__item a:hover { text-decoration: underline; }
.related-posts__item__date {
  font-size: 0.75rem;
  color: var(--color-text-sub);
  margin-bottom: 3px;
}

/* サイドバー */
.sidebar__section {
  margin-bottom: 32px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 20px;
}
.sidebar__section-title {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 14px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.sidebar__recent-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.sidebar__recent-list li {
  font-size: 0.85rem;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 10px;
}
.sidebar__recent-list li:last-child { border-bottom: none; padding-bottom: 0; }
.sidebar__recent-list a { color: var(--color-text); }
.sidebar__recent-date { font-size: 0.75rem; color: var(--color-text-sub); margin-bottom: 2px; }
.sidebar__cta {
  background: var(--color-accent-light);
  border: 1px solid #b0d8c0;
  font-size: 0.875rem;
  line-height: 1.7;
}
.sidebar__cta a {
  display: block;
  margin-top: 12px;
  font-weight: 700;
  color: var(--color-accent);
}

/* フッター */
.site-footer {
  background: #1a1a1a;
  color: #aaa;
  text-align: center;
  padding: 28px 24px;
  margin-top: 64px;
  font-size: 0.8rem;
}
.site-footer a { color: #ccc; }

/* レスポンシブ調整 */
@media (max-width: 600px) {
  .site-header { padding: 0 16px; }
  .site-header__inner { height: auto; min-height: 56px; align-items: flex-start; flex-direction: column; padding: 12px 0; gap: 8px; }
  .site-header__nav { flex-wrap: wrap; gap: 10px 14px; }
  .page-wrapper { padding: 28px 18px; }
  .hero__title { font-size: 1.65rem; }
  .hero__media { aspect-ratio: 16 / 11; }
  .article-title { font-size: 1.35rem; }
  .article-body h2 { font-size: 1.2rem; }
  .cta-section { padding: 24px 20px; }
}