@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500&family=Playfair+Display:ital,wght@0,400;0,700;0,900;1,400&family=Source+Serif+4:ital,wght@0,300;0,400;0,600;1,300&display=swap');

/* =============================================
   リセット & 基礎
   ============================================= */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #fafaf8;
  --ink: #1a1a1a;
  --mid: #4a4a4a;
  --pale: #f0efe9;
  --rule: #d0cfc8;
  --accent: #1a1a1a;
  --font-display: 'Playfair Display', 'Georgia', serif;
  --font-body: 'Source Serif 4', 'Georgia', serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;
  --header-h: 60px;
  --max-w: 1140px;
  --prose-w: 720px;
}

html {
  font-size: 17px;
  line-height: 1.65;
  background: var(--bg);
  color: var(--ink);
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--ink);
  min-height: 100vh;
  overflow-x: hidden;
}

/* 纸质肌理叠加 */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.035;
  background-image:
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 2px,
      rgba(26,26,26,0.3) 2px,
      rgba(26,26,26,0.3) 3px
    );
  background-size: 100% 4px;
}

img { display: block; max-width: 100%; height: auto; }
a { color: var(--ink); text-decoration: underline; text-underline-offset: 3px; }
a:hover { opacity: 0.65; }
ul, ol { list-style: none; }
button { cursor: pointer; font-family: inherit; }

/* =============================================
   导航 overlay 全屏遮罩
   ============================================= */
.nav-overlay {
  position: fixed;
  inset: 0;
  background: var(--ink);
  color: var(--bg);
  z-index: 9000;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  padding: 4rem 3rem;
  opacity: 0;
  pointer-events: none;
  transition: none;
}

.nav-overlay.is-open {
  opacity: 1;
  pointer-events: all;
}

@media (prefers-reduced-motion: reduce) {
  .nav-overlay { transition: none; }
}

.nav-close {
  position: absolute;
  top: 1.5rem;
  right: 2rem;
  background: none;
  border: none;
  color: var(--bg);
  font-size: 2rem;
  line-height: 1;
  min-height: 44px;
  min-width: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0.7;
  transition: none;
}
.nav-close:hover { opacity: 1; }

.overlay-nav menu {
  list-style: none;
}
.overlay-nav menu li {
  border-bottom: 1px solid rgba(250,250,248,0.15);
}
.overlay-nav menu li a {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 2.5vw, 1.6rem);
  font-weight: 700;
  color: var(--bg);
  text-decoration: none;
  padding: 0.85rem 0;
  min-height: 52px;
  display: flex;
  align-items: center;
  letter-spacing: 0.01em;
  transition: none;
}
.overlay-nav menu li a:hover {
  padding-left: 1rem;
  opacity: 0.75;
}

/* =============================================
   header
   ============================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 800;
  background: var(--bg);
  border-bottom: 2px solid var(--ink);
  height: var(--header-h);
}

.header-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-link {
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.brand-text {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
  color: var(--ink);
  line-height: 1;
}

.brand-logo {
  height: 36px;
  width: auto;
}

/* details/summary nav — 桌面也是汉堡 */
.nav-details {
  position: relative;
}

.nav-details[open] > .nav-menu {
  display: block;
}

/* summary 就是汉堡按钮，点击触发 JS overlay */
.nav-toggle {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  background: none;
  border: 1.5px solid var(--ink);
  padding: 0.35rem 0.75rem;
  min-height: 42px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  user-select: none;
}
.nav-toggle::-webkit-details-marker { display: none; }

.hamburger-lines {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 18px;
}
.hamburger-lines span {
  display: block;
  height: 1.5px;
  background: var(--ink);
  width: 100%;
}
.hamburger-lines span:nth-child(2) { width: 70%; }

.toggle-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
}

/* nav-menu は JS overlay で代替するため非表示 */
.nav-menu {
  display: none;
}

/* =============================================
   section-inner 共通
   ============================================= */
.section-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* =============================================
   パンくず
   ============================================= */
.breadcrumb {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--mid);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  border-bottom: 1px solid var(--rule);
}
.breadcrumb a { color: var(--mid); text-decoration: none; }
.breadcrumb a:hover { color: var(--ink); }
.breadcrumb span[aria-hidden] { opacity: 0.4; }

/* =============================================
   HOME
   ============================================= */
.home-main {}

/* Hero */
.hero-section {
  min-height: 70vh;
  display: flex;
  align-items: center;
  border-bottom: 2px solid var(--ink);
  position: relative;
  overflow: hidden;
  background: var(--bg);
}

.hero-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 4rem 1.5rem;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 3rem;
  align-items: center;
  width: 100%;
}

.hero-content {
  max-width: 640px;
}

.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mid);
  display: block;
  margin-bottom: 1rem;
  border-left: 3px solid var(--ink);
  padding-left: 0.6rem;
}

.hero-content h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.8rem);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 1.25rem;
  transform: rotate(-0.5deg);
}

.hero-lead {
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--mid);
  margin-bottom: 2rem;
  max-width: 500px;
}

.cta-btn {
  display: inline-flex;
  align-items: center;
  background: var(--ink);
  color: var(--bg);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  padding: 0.75rem 1.5rem;
  min-height: 48px;
  border: 2px solid var(--ink);
  transition: none;
}
.cta-btn:hover {
  background: var(--bg);
  color: var(--ink);
  opacity: 1;
}

/* Hero 装飾 */
.hero-deco {
  width: 200px;
  height: 200px;
  position: relative;
  flex-shrink: 0;
}

.dot-grid {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, var(--mid) 1px, transparent 1px);
  background-size: 16px 16px;
  opacity: 0.25;
}

.ink-mark {
  position: absolute;
  background: var(--ink);
}
.ink-mark-1 {
  width: 60px;
  height: 3px;
  top: 30%;
  left: 20%;
  transform: rotate(-8deg);
  opacity: 0.5;
}
.ink-mark-2 {
  width: 3px;
  height: 80px;
  top: 20%;
  right: 25%;
  transform: rotate(5deg);
  opacity: 0.3;
}

/* セクション共通 */
.section-header {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: 2rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid var(--ink);
}
.section-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--mid);
  letter-spacing: 0.1em;
}
.section-header h2 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
}
.article-count {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--mid);
  margin-left: auto;
}

/* content prose */
.content-section {
  padding: 3rem 0;
  border-bottom: 1px solid var(--rule);
}
.prose-section .section-inner {
  max-width: var(--prose-w);
}

/* channel grid */
.channels-section {
  padding: 3.5rem 0;
  border-bottom: 1px solid var(--rule);
}

.channel-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 0;
  list-style: none;
  border: 2px solid var(--ink);
}

.channel-card {
  border-right: 2px solid var(--ink);
  border-bottom: 2px solid var(--ink);
  transform: rotate(var(--card-tilt, 0deg));
  transition: none;
}
.channel-card:hover {
  background: var(--pale);
  transform: rotate(0deg);
}

.channel-card-inner {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 1.5rem;
  text-decoration: none;
  color: var(--ink);
  height: 100%;
  min-height: 180px;
}

.card-index {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--mid);
  letter-spacing: 0.1em;
}
.channel-card-inner h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.3;
  flex: 1;
}
.channel-card-inner p {
  font-size: 0.85rem;
  color: var(--mid);
  line-height: 1.5;
}
.card-meta {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--mid);
  margin-top: auto;
}

/* recent list */
.recent-section {
  padding: 3.5rem 0;
}

.recent-list {
  list-style: none;
  counter-reset: recent;
}
.recent-list li {
  counter-increment: recent;
  border-bottom: 1px solid var(--rule);
}
.recent-list li a {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 0;
  text-decoration: none;
  color: var(--ink);
  min-height: 44px;
}
.recent-list li a::before {
  content: counter(recent, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--mid);
  flex-shrink: 0;
  width: 2rem;
}
.recent-list li a:hover .art-title { text-decoration: underline; }
.art-title {
  flex: 1;
  font-size: 0.95rem;
  line-height: 1.4;
}
.recent-list li a small {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--mid);
  flex-shrink: 0;
  white-space: nowrap;
}

/* =============================================
   CHANNEL
   ============================================= */
.channel-main {}

.channel-hero {
  padding: 3rem 0 2rem;
  border-bottom: 2px solid var(--ink);
  position: relative;
}
.channel-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mid);
  display: inline-block;
  border: 1.5px solid var(--mid);
  padding: 0.15rem 0.5rem;
  margin-bottom: 1rem;
}
.channel-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 4vw, 3rem);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.02em;
  max-width: 700px;
  transform: rotate(-0.3deg);
}
.channel-desc {
  margin-top: 1rem;
  font-size: 1rem;
  color: var(--mid);
  max-width: 600px;
  line-height: 1.65;
}
.channel-rule {
  height: 3px;
  background: var(--ink);
  margin-top: 2rem;
  width: 80px;
  transform: rotate(-1deg);
}

.channel-content {
  padding: 2.5rem 0;
  border-bottom: 1px solid var(--rule);
}

.channel-children {
  padding: 3rem 0;
}

.children-list {
  list-style: none;
  counter-reset: child-counter;
}

.child-item {
  counter-increment: child-counter;
  border-bottom: 1px solid var(--rule);
  opacity: 0;
  transform: translateY(16px);
  transition: none;
}
.child-item.revealed {
  opacity: 1;
  transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
  .child-item { opacity: 1; transform: none; }
}

.child-item a {
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  padding: 1.25rem 0;
  text-decoration: none;
  color: var(--ink);
  min-height: 52px;
}
.child-item a:hover .child-info strong { text-decoration: underline; }

.child-thumb-wrap {
  flex-shrink: 0;
  width: 80px;
  overflow: hidden;
  border: 1px solid var(--rule);
}
.child-thumb { width: 100%; height: 60px; object-fit: cover; }

.child-info {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}
.child-index {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--mid);
  letter-spacing: 0.08em;
}
.child-info strong {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.3;
}
.child-info small {
  font-size: 0.82rem;
  color: var(--mid);
  line-height: 1.5;
}

.empty-note {
  font-style: italic;
  color: var(--mid);
  padding: 1.5rem 0;
}

/* =============================================
   ARTICLE
   ============================================= */
.article-main {}

.article-header-section {
  padding: 2.5rem 0 2rem;
  border-bottom: 2px solid var(--ink);
}
.article-channel-tag {
  display: inline-block;
  margin-bottom: 0.75rem;
}
.article-channel-tag a {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--mid);
  text-decoration: none;
  border-bottom: 1px solid var(--mid);
  padding-bottom: 1px;
}
.article-channel-tag a:hover { color: var(--ink); border-color: var(--ink); opacity: 1; }

.article-header-section h1 {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 4vw, 2.8rem);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.02em;
  max-width: 800px;
  transform: rotate(-0.4deg);
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  margin-top: 1rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--mid);
}

.article-hero-section {
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--rule);
}
.article-hero-wrap figure {
  overflow: hidden;
  border: 1.5px solid var(--rule);
}
.article-hero-img {
  width: 100%;
  max-height: 420px;
  object-fit: cover;
}

.article-body {
  padding: 2.5rem 0;
}
.article-content-grid {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 3rem;
  max-width: var(--max-w);
  align-items: start;
}

.article-prose {
  min-width: 0;
}

.article-sidebar {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  position: sticky;
  top: calc(var(--header-h) + 1.5rem);
}

.sidebar-block {
  border: 1.5px solid var(--rule);
  padding: 1.25rem;
  opacity: 0;
  transform: translateX(12px);
  transition: none;
}
.sidebar-block.revealed {
  opacity: 1;
  transform: translateX(0);
}
@media (prefers-reduced-motion: reduce) {
  .sidebar-block { opacity: 1; transform: none; }
}

.sidebar-heading {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--mid);
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 0.5rem;
}

.sidebar-list {
  list-style: none;
  counter-reset: sib;
}
.sidebar-list li {
  counter-increment: sib;
  border-bottom: 1px solid var(--rule);
}
.sidebar-list li:last-child { border-bottom: none; }
.sidebar-list li a {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding: 0.6rem 0;
  text-decoration: none;
  color: var(--ink);
  font-size: 0.88rem;
  line-height: 1.4;
  min-height: 40px;
  justify-content: center;
}
.sidebar-list li a:hover span { text-decoration: underline; }
.sidebar-list li a small {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--mid);
}

/* =============================================
   ABOUT
   ============================================= */
.about-main {}

.about-intro {
  padding: 3rem 0 2rem;
  border-bottom: 2px solid var(--ink);
  position: relative;
  overflow: hidden;
}
.about-stamp {
  position: absolute;
  right: 2rem;
  top: 50%;
  transform: translateY(-50%) rotate(-12deg);
  font-family: var(--font-display);
  font-size: clamp(4rem, 12vw, 10rem);
  font-weight: 900;
  color: var(--ink);
  opacity: 0.04;
  pointer-events: none;
  line-height: 1;
  user-select: none;
}
.about-intro h1 {
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 4vw, 3rem);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.02em;
  max-width: 700px;
}
.about-lead {
  margin-top: 1rem;
  font-size: 1.05rem;
  color: var(--mid);
  max-width: 580px;
  line-height: 1.7;
}

.about-body {
  padding: 3rem 0;
}
.about-deco-fig {
  margin-bottom: 2rem;
}
.about-rule-block {
  width: 120px;
  height: 4px;
  background: var(--ink);
  transform: rotate(-1.5deg);
}

.about-links-aside {
  margin-top: 3rem;
  border-top: 2px solid var(--ink);
  padding-top: 2rem;
}
.about-links-aside h2 {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--mid);
  margin-bottom: 1rem;
}
.about-nav-list {
  list-style: none;
  counter-reset: about-nav;
}
.about-nav-list li {
  counter-increment: about-nav;
  border-bottom: 1px solid var(--rule);
}
.about-nav-list li a {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 0;
  text-decoration: none;
  color: var(--ink);
  font-size: 0.95rem;
  min-height: 44px;
}
.about-nav-list li a::before {
  content: counter(about-nav, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--mid);
  flex-shrink: 0;
}
.about-nav-list li a:hover span { text-decoration: underline; }

/* =============================================
   PRIVACY
   ============================================= */
.privacy-main {}

.privacy-header {
  padding: 2.5rem 0 2rem;
  border-bottom: 2px solid var(--ink);
}
.privacy-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mid);
  border: 1.5px solid var(--mid);
  padding: 0.15rem 0.5rem;
  display: inline-block;
  margin-bottom: 0.75rem;
}
.privacy-header h1 {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3.5vw, 2.5rem);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.02em;
}
.privacy-date {
  margin-top: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--mid);
}

.privacy-body {
  padding: 3rem 0;
}
.privacy-content-wrap {
  display: grid;
  grid-template-columns: 1fr 240px;
  gap: 3rem;
  max-width: var(--max-w);
  align-items: start;
}
.privacy-prose { min-width: 0; }
.privacy-aside {
  border: 1.5px solid var(--rule);
  padding: 1.25rem;
  position: sticky;
  top: calc(var(--header-h) + 1.5rem);
}
.privacy-aside h2 {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--mid);
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 0.5rem;
}

/* =============================================
   PROSE 共通（正文 HTML 片段）
   ============================================= */
.article-prose h2,
.privacy-prose h2,
.about-body h2 {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 700;
  margin: 2.5rem 0 1rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--rule);
  letter-spacing: -0.01em;
}
.article-prose h3,
.privacy-prose h3,
.about-body h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  margin: 2rem 0 0.75rem;
}
.article-prose p,
.privacy-prose p,
.about-body p,
.channel-content p {
  margin-bottom: 1.25rem;
  line-height: 1.75;
  font-size: 1rem;
}
.article-prose ul,
.privacy-prose ul,
.about-body ul {
  list-style: disc;
  padding-left: 1.5rem;
  margin-bottom: 1.25rem;
}
.article-prose ol,
.privacy-prose ol,
.about-body ol {
  list-style: decimal;
  padding-left: 1.5rem;
  margin-bottom: 1.25rem;
}
.article-prose li,
.privacy-prose li,
.about-body li {
  margin-bottom: 0.4rem;
  line-height: 1.65;
}
.article-prose blockquote,
.privacy-prose blockquote,
.about-body blockquote {
  border-left: 3px solid var(--ink);
  padding: 0.5rem 1.25rem;
  margin: 1.5rem 0;
  font-style: italic;
  color: var(--mid);
}
.article-prose a,
.privacy-prose a,
.about-body a {
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.article-prose time,
.privacy-prose time {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--mid);
  background: var(--pale);
  padding: 0.1rem 0.35rem;
  border-radius: 2px;
}
.article-prose img,
.privacy-prose img,
.about-body img {
  max-width: 100%;
  border: 1px solid var(--rule);
  margin: 1.5rem 0;
}
.article-prose figure,
.privacy-prose figure {
  margin: 2rem 0;
}
.article-prose figcaption,
.privacy-prose figcaption {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--mid);
  margin-top: 0.5rem;
}
.article-prose code,
.privacy-prose code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--pale);
  padding: 0.1em 0.35em;
  border-radius: 2px;
}
.article-prose aside,
.privacy-prose aside {
  border: 1.5px solid var(--rule);
  padding: 1.25rem;
  margin: 2rem 0;
  background: var(--pale);
}

/* channel content prose */
.channel-content .section-inner h2 {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 700;
  margin: 2rem 0 0.75rem;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 0.4rem;
}
.channel-content .section-inner p {
  margin-bottom: 1.25rem;
  line-height: 1.75;
}
.channel-content .section-inner ul,
.channel-content .section-inner ol {
  padding-left: 1.5rem;
  margin-bottom: 1.25rem;
}
.channel-content .section-inner ul { list-style: disc; }
.channel-content .section-inner ol { list-style: decimal; }
.channel-content .section-inner li { margin-bottom: 0.4rem; }

/* =============================================
   FOOTER
   ============================================= */
.site-footer {
  background: var(--ink);
  color: var(--bg);
  margin-top: 4rem;
}

.footer-cta {
  padding: 4rem 1.5rem;
  max-width: var(--max-w);
  margin: 0 auto;
  border-bottom: 1px solid rgba(250,250,248,0.15);
}
.footer-cta h2 {
  font-family: var(--font-display);
  font-size: clamp(1.3rem, 3vw, 2rem);
  font-weight: 700;
  color: var(--bg);
  margin-bottom: 1.5rem;
  letter-spacing: -0.01em;
}
.footer-cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}
.footer-cta-links a {
  display: inline-flex;
  align-items: center;
  color: var(--bg);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  border: 1.5px solid rgba(250,250,248,0.4);
  padding: 0.5rem 1rem;
  min-height: 42px;
  transition: none;
}
.footer-cta-links a:hover {
  background: var(--bg);
  color: var(--ink);
  border-color: var(--bg);
  opacity: 1;
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2.5rem;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 3rem 1.5rem;
  border-bottom: 1px solid rgba(250,250,248,0.15);
}

.footer-col h3 {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(250,250,248,0.5);
  margin-bottom: 1rem;
}
.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}
.footer-col ul li a {
  color: rgba(250,250,248,0.8);
  text-decoration: none;
  font-size: 0.88rem;
  line-height: 1.4;
  min-height: 28px;
  display: flex;
  align-items: center;
}
.footer-col ul li a:hover { color: var(--bg); opacity: 1; }
.footer-note {
  font-size: 0.82rem;
  color: rgba(250,250,248,0.5);
  line-height: 1.6;
}

.footer-bottom {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 1.5rem 1.5rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: rgba(250,250,248,0.4);
  text-align: center;
}

/* =============================================
   Reveal アニメーション
   ============================================= */
[data-reveal] {
  opacity: 0;
  transform: translateY(16px);
}
[data-reveal].revealed {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.4s ease, transform 0.4s ease;
}
@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1; transform: none; transition: none; }
}

/* =============================================
   モバイル断点
   ============================================= */
@media (max-width: 900px) {
  .article-content-grid {
    grid-template-columns: 1fr;
  }
  .article-sidebar {
    position: static;
  }
  .privacy-content-wrap {
    grid-template-columns: 1fr;
  }
  .privacy-aside {
    position: static;
  }
  .footer-cols {
    grid-template-columns: repeat(2, 1fr);
  }
  .hero-inner {
    grid-template-columns: 1fr;
  }
  .hero-deco {
    display: none;
  }
}

@media (max-width: 600px) {
  :root {
    --header-h: 56px;
  }
  .header-inner {
    padding: 0 1rem;
  }
  .section-inner {
    padding: 0 1rem;
  }
  .breadcrumb {
    padding: 0.6rem 1rem;
  }
  .hero-inner {
    padding: 2.5rem 1rem;
    min-height: 70vh;
  }
  .hero-content h1 {
    font-size: 1.85rem;
  }
  .channel-grid {
    grid-template-columns: 1fr;
  }
  .channel-card {
    transform: none;
    border-right: none;
  }
  .footer-cols {
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    padding: 2rem 1rem;
  }
  .footer-cta {
    padding: 2.5rem 1rem;
  }
  .footer-cta-links {
    flex-direction: column;
  }
  .footer-cta-links a {
    width: 100%;
    justify-content: center;
  }
  .footer-bottom {
    padding: 1.25rem 1rem;
    flex-direction: column;
    gap: 0.5rem;
  }
  .children-list .child-item a {
    flex-direction: column;
  }
  .child-thumb-wrap {
    width: 100%;
  }
  .about-stamp {
    display: none;
  }
  .toggle-label {
    display: none;
  }
  .nav-toggle {
    padding: 0.35rem 0.6rem;
  }
  .nav-overlay {
    padding: 2rem 1.25rem;
  }
  .overlay-nav menu li a {
    font-size: 1.1rem;
    padding: 0.75rem 0;
    min-height: 48px;
  }
  .recent-list li a {
    flex-direction: column;
    gap: 0.2rem;
    align-items: flex-start;
  }
  .recent-list li a::before {
    font-size: 0.65rem;
  }
  .sidebar-nav-block {
    display: none;
  }
}

@media (max-width: 375px) {
  html { font-size: 16px; }
  .footer-cols { grid-template-columns: 1fr; }
}