/* ============================================================
   basa 政治ニュース — editorial theme
   見出し: Noto Serif JP / 本文: Noto Sans JP
   ライト/ダーク両対応・可読性重視
   ============================================================ */

:root {
  --paper: #fbfaf7;
  --surface: #ffffff;
  --ink: #1b1b1b;
  --ink-soft: #45433f;
  --muted: #76726a;
  --rule: #e4e0d6;
  --rule-strong: #ccc6b8;
  --accent: #9a1f2b; /* editorial crimson */
  --accent-soft: rgba(154, 31, 43, 0.08);
  --link: #1a4fa0;
  --link-hover: #0f3a7d;
  --shadow: 0 1px 2px rgba(20, 18, 12, 0.04), 0 6px 24px rgba(20, 18, 12, 0.05);

  --serif: "Noto Serif JP", "Hiragino Mincho ProN", "Yu Mincho", Georgia, serif;
  --sans: "Noto Sans JP", -apple-system, BlinkMacSystemFont, "Hiragino Sans",
    "Yu Gothic", sans-serif;

  --measure: 44rem; /* 読み幅 */
  --gutter: clamp(1rem, 4vw, 2rem);
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #16151a;
    --surface: #1e1d23;
    --ink: #ededec;
    --ink-soft: #c6c4c0;
    --muted: #908d96;
    --rule: #2d2c33;
    --rule-strong: #3c3a43;
    --accent: #e2727c;
    --accent-soft: rgba(226, 114, 124, 0.12);
    --link: #82b1ff;
    --link-hover: #a9caff;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 28px rgba(0, 0, 0, 0.35);
  }
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--sans);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.8;
  font-size: 16px;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--link);
  text-underline-offset: 0.18em;
  transition: color 0.15s ease;
}
a:hover {
  color: var(--link-hover);
}

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}

.container {
  width: 100%;
  max-width: 64rem;
  margin: 0 auto;
  padding-inline: var(--gutter);
}

/* ---------- Masthead ---------- */
.masthead {
  background: var(--surface);
  border-bottom: 1px solid var(--rule);
}
.masthead-inner {
  max-width: 64rem;
  margin: 0 auto;
  padding: 1.6rem var(--gutter) 1.1rem;
  text-align: center;
}
.masthead-brand {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--ink);
}
.masthead-rule {
  display: block;
  width: 2.2rem;
  height: 3px;
  background: var(--accent);
}
.masthead-title {
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(1.5rem, 5vw, 2.1rem);
  letter-spacing: 0.04em;
  line-height: 1.2;
}
.masthead-tagline {
  margin: 0.5rem 0 0;
  color: var(--muted);
  font-size: 0.8rem;
  letter-spacing: 0.02em;
}
.masthead-nav {
  margin-top: 1rem;
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  border-top: 1px solid var(--rule);
  padding-top: 0.85rem;
}
.masthead-nav a {
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  padding: 0.2rem 0;
  border-bottom: 2px solid transparent;
  transition: border-color 0.15s ease, color 0.15s ease;
}
.masthead-nav a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* ---------- Feed (一覧) ---------- */
.feed {
  margin: 2rem 0;
  display: flex;
  flex-direction: column;
}
.card {
  padding: 1.6rem 0;
  border-bottom: 1px solid var(--rule);
}
.card:first-child {
  padding-top: 0.5rem;
}
.card-link {
  display: block;
  text-decoration: none;
  color: var(--ink);
}
.card-date,
.post-date {
  display: inline-block;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}
.card-title {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(1.2rem, 3.4vw, 1.5rem);
  line-height: 1.45;
  margin: 0.35rem 0 0.5rem;
  transition: color 0.15s ease;
}
.card-link:hover .card-title {
  color: var(--accent);
}
.card-summary {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
  line-height: 1.75;
}

/* ---------- Tags ---------- */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.9rem;
}
.tag {
  font-size: 0.74rem;
  color: var(--accent);
  text-decoration: none;
  background: var(--accent-soft);
  padding: 0.18rem 0.7rem;
  border-radius: 999px;
  letter-spacing: 0.02em;
  transition: background 0.15s ease, color 0.15s ease;
}
.tag:hover {
  background: var(--accent);
  color: #fff;
}
@media (prefers-color-scheme: dark) {
  .tag:hover {
    color: var(--paper);
  }
}

/* ---------- Post (記事詳細) ---------- */
.post {
  max-width: var(--measure);
  margin: 2.2rem auto;
}
.back {
  display: inline-block;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.82rem;
  margin-bottom: 1.4rem;
}
.back:hover {
  color: var(--accent);
}
.post-title {
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(1.6rem, 5.5vw, 2.4rem);
  line-height: 1.4;
  margin: 0.4rem 0 0.8rem;
  letter-spacing: 0.01em;
}
.post-body {
  margin-top: 1.8rem;
  font-size: 1.05rem;
  line-height: 1.95;
  color: var(--ink);
}
.post-body > p:first-of-type::first-letter {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 3.1rem;
  line-height: 0.82;
  float: left;
  margin: 0.08em 0.12em 0 0;
  color: var(--accent);
}
.post-body h2 {
  font-family: var(--serif);
  font-size: 1.3rem;
  margin: 2.4rem 0 0.8rem;
  padding-left: 0.8rem;
  border-left: 4px solid var(--accent);
  line-height: 1.5;
}
.post-body h3 {
  font-family: var(--serif);
  font-size: 1.1rem;
  margin: 1.8rem 0 0.6rem;
}
.post-body p {
  margin: 1.1rem 0;
}
.post-body a {
  text-decoration: underline;
}
.post-body ul,
.post-body ol {
  padding-left: 1.4rem;
}
.post-body li {
  margin: 0.4rem 0;
}
.post-body blockquote {
  border-left: 3px solid var(--rule-strong);
  margin: 1.4rem 0;
  padding: 0.4rem 0 0.4rem 1.2rem;
  color: var(--ink-soft);
  font-style: normal;
}

/* ---------- Sources (出典) ---------- */
.sources {
  margin-top: 2.6rem;
  border-top: 1px solid var(--rule);
  padding-top: 1.4rem;
}
.sources h2 {
  font-family: var(--serif);
  font-size: 1rem;
  letter-spacing: 0.06em;
  margin: 0 0 0.6rem;
}
.sources ul {
  padding-left: 1.1rem;
  margin: 0;
}
.sources li {
  font-size: 0.82rem;
  word-break: break-all;
  margin: 0.4rem 0;
  color: var(--ink-soft);
}

/* ---------- Topic pages ---------- */
.topic-heading {
  font-family: var(--serif);
  font-size: clamp(1.4rem, 4vw, 1.8rem);
  margin: 2rem 0 1rem;
  padding-bottom: 0.6rem;
  border-bottom: 2px solid var(--accent);
}
.topics-index {
  margin: 2rem 0;
}

.empty {
  color: var(--muted);
  text-align: center;
  padding: 4rem 0;
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--rule);
  margin-top: 3rem;
  padding: 2.2rem 0;
  background: var(--surface);
}
.footer-policy {
  max-width: var(--measure);
  margin: 0 auto 0.8rem;
  color: var(--muted);
  font-size: 0.8rem;
  line-height: 1.8;
  text-align: center;
}
.footer-copy {
  text-align: center;
  color: var(--muted);
  font-size: 0.78rem;
  margin: 0;
}

/* ---------- Motion ---------- */
@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    animation: none !important;
  }
}

/* ---------- Small screens ---------- */
@media (max-width: 600px) {
  body {
    line-height: 1.78;
  }
  .post-body {
    font-size: 1rem;
  }
  .post-body > p:first-of-type::first-letter {
    font-size: 2.6rem;
  }
}