/* ============================================================
   009 Margin — sans-serif ニュートラルミニマル / 左サイドバー2カラム
   配色とフォントはこの :root で差し替え可能
   ============================================================ */
:root {
  --color-paper: #faf9f6;
  --color-text: #2b2a28;
  --color-muted: #6f6c66;
  --color-accent: #3a5a8c;
  --color-line: #ddd9d1;
  --sidebar-width: 15rem;
  --reading-width: 36rem;
  --font-body: "Noto Sans JP", "Inter", system-ui, sans-serif;
  --font-en: "Inter", system-ui, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-paper: #1a1a18;
    --color-text: #e8e5dd;
    --color-muted: #9a968d;
    --color-accent: #8fb0e0;
    --color-line: #34322d;
  }
}

body {
  font-family: var(--font-body);
  background: var(--color-paper);
  color: var(--color-text);
  line-height: 1.85;
  font-weight: 400;
}

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

/* --- 2カラムシェル（PC） --- */
@media (min-width: 768px) {
  body {
    display: grid;
    grid-template-columns: var(--sidebar-width) 1fr;
    align-items: start;
  }
}

/* --- サイドバー --- */
.site-sidebar {
  border-bottom: 1px solid var(--color-line);
}
.site-sidebar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.25rem;
}
.site-name {
  font-family: var(--font-en);
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--color-text);
}

@media (min-width: 768px) {
  .site-sidebar {
    position: sticky;
    top: 0;
    height: 100vh;
    border-bottom: 0;
    border-right: 1px solid var(--color-line);
  }
  .site-sidebar-inner {
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 2rem;
    height: 100%;
    padding: 2.5rem 1.5rem;
  }
}

/* --- drawer: SP は popover で左からスライド、PC は display:contents でフラット化 --- */
.drawer {
  position: fixed;
  inset: 0 30% 0 0;
  height: 100dvh;
  margin: 0;
  padding: 2rem 1.5rem;
  background: var(--color-paper);
  border: 0;
  border-right: 1px solid var(--color-line);
  transform: translateX(-100%);
  transition: transform 200ms ease;
  overflow-y: auto;
}
.drawer:popover-open {
  transform: translateX(0);
}
.drawer::backdrop {
  background: color-mix(in oklab, var(--color-text) 35%, transparent);
}

.site-nav ul {
  list-style: none;
  padding-left: 0;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}
.site-nav a {
  font-family: var(--font-en);
  font-size: 0.95rem;
  color: var(--color-text);
}
.site-nav a:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.sidebar-profile {
  font-size: 0.85rem;
  color: var(--color-muted);
  margin-top: 1.5rem;
}
.inline-list {
  list-style: none;
  padding-left: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1rem;
}
.sidebar-links.inline-list {
  margin-top: 0.75rem;
  font-size: 0.85rem;
}

.drawer-close {
  position: absolute;
  top: 0.75rem;
  right: 1rem;
  font-size: 1.25rem;
  background: transparent;
  border: 0;
  color: var(--color-text);
  cursor: pointer;
}

.nav-toggle {
  background: transparent;
  border: 0;
  color: var(--color-text);
  cursor: pointer;
  padding: 0.25rem;
}

@media (min-width: 768px) {
  .drawer {
    display: contents;
  }
  .drawer-close,
  .nav-toggle {
    display: none;
  }
}

/* --- メイン --- */
.site-main {
  max-width: calc(var(--reading-width) + 4rem);
  margin: 0 auto;
  padding: 2.5rem 1.5rem 5rem;
}
@media (min-width: 768px) {
  .site-main {
    margin: 0;
    padding: 4rem 3rem 6rem;
  }
}

/* --- 見出し h1-h6 視覚差別化 --- */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.4;
}
.hero-title {
  font-family: var(--font-en), "Noto Sans JP", sans-serif;
  font-size: 2.4rem;
  letter-spacing: 0.02em;
  margin: 0;
}
.page-title {
  font-size: 1.8rem;
  margin-bottom: 2rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-text);
}
.section-title {
  font-size: 1.25rem;
  margin: 0 0 1rem;
  color: var(--color-accent);
}
h1 {
  font-size: 2rem;
  margin: 2.5rem 0 1rem;
}
h2 {
  font-size: 1.5rem;
  margin: 2.2rem 0 0.9rem;
  padding-bottom: 0.3rem;
  border-bottom: 1px solid var(--color-line);
}
h3 {
  font-size: 1.25rem;
  margin: 1.8rem 0 0.7rem;
}
h4 {
  font-size: 1.1rem;
  margin: 1.5rem 0 0.6rem;
  color: var(--color-muted);
}
h5 {
  font-size: 1rem;
  margin: 1.3rem 0 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-family: var(--font-en);
}
h6 {
  font-size: 0.9rem;
  margin: 1.2rem 0 0.4rem;
  color: var(--color-muted);
  font-style: italic;
}

/* --- 段落・強調（em/strong/mark をそれぞれ別装飾） --- */
p {
  margin: 0 0 1.2rem;
}
em {
  font-style: italic;
  color: var(--color-accent);
}
strong {
  font-weight: 700;
  border-bottom: 2px solid var(--color-accent);
}
mark {
  background: color-mix(in oklab, var(--color-accent) 20%, transparent);
  color: inherit;
  padding: 0 0.15em;
}

/* --- リスト・引用・表・コード（ベース装飾は素タグに） --- */
ul,
ol {
  padding-left: 1.4rem;
  margin: 0 0 1.2rem;
}
li {
  margin: 0.3rem 0;
}
dl {
  margin: 0 0 1.2rem;
}
dt {
  font-weight: 700;
}
dd {
  margin: 0 0 0.6rem 1rem;
  color: var(--color-muted);
}
blockquote {
  margin: 0 0 1.2rem;
  padding: 0.5rem 1.2rem;
  border-left: 3px solid var(--color-line);
  color: var(--color-muted);
}
table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 1.2rem;
}
th,
td {
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--color-line);
  text-align: left;
}
th {
  background: color-mix(in oklab, var(--color-text) 5%, transparent);
  font-weight: 500;
}
hr {
  border: 0;
  border-top: 1px solid var(--color-line);
  margin: 2.5rem 0;
}
code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.9em;
  background: color-mix(in oklab, var(--color-text) 6%, transparent);
  padding: 0.1em 0.35em;
  border-radius: 2px;
}
pre {
  margin: 0 0 1.2rem;
  padding: 0.9rem 1.1rem;
  background: color-mix(in oklab, var(--color-text) 5%, transparent);
  border: 1px solid var(--color-line);
  border-radius: 2px;
  overflow: auto;
}
pre code {
  background: transparent;
  padding: 0;
}
img {
  max-width: 100%;
  height: auto;
}

/* ===== フォーム要素 ===== */
label {
  display: block;
  font-size: 0.85rem;
  color: var(--color-muted);
  margin-bottom: 0.3em;
}

input[type="text"],
input[type="password"],
input[type="number"],
input[type="email"],
input[type="search"],
input[type="url"],
input[type="tel"],
textarea,
select {
  -webkit-appearance: none;
  border: 1px solid var(--color-line);
  background: var(--color-paper);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 0.95rem;
  padding: 0.5rem;
  border-radius: 0;
}

textarea {
  width: 100%;
  min-height: 4rem;
  margin: 0.5rem 0;
  resize: vertical;
}

select {
  padding-right: 1.75rem;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%236f6c66' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.5rem center;
}

button,
input[type="button"],
input[type="submit"],
input[type="reset"] {
  -webkit-appearance: none;
  background: var(--color-paper);
  color: var(--color-text);
  border: 1px solid var(--color-line);
  padding: 0.5rem 1.5rem;
  font-family: var(--font-body);
  font-size: 0.95rem;
  cursor: pointer;
  touch-action: manipulation;
  letter-spacing: 0.05em;
}

button:hover,
input[type="button"]:hover,
input[type="submit"]:hover,
input[type="reset"]:hover {
  border-color: var(--color-accent);
}

.form-actions {
  display: block;
  text-align: center;
}

/* --- トップのセクション・novels カード --- */
.top-section {
  margin-top: 3rem;
}
.top-section-more {
  margin-top: 1rem;
  font-family: var(--font-en);
  font-size: 0.9rem;
}
.novels-list {
  list-style: none;
  padding-left: 0;
}
.novel-card {
  border-top: 1px solid var(--color-line);
}
.novel-card a {
  display: block;
  color: inherit;
  padding: 1.25rem 0;
}
.novel-card a:hover {
  text-decoration: none;
  color: var(--color-accent);
}
.novel-card-title {
  font-size: 1.15rem;
  margin: 0 0 0.4rem;
  border-bottom: 0;
  padding-bottom: 0;
}
.novel-card-meta {
  display: flex;
  gap: 1rem;
  font-family: var(--font-en);
  font-size: 0.8rem;
  color: var(--color-muted);
}
.novel-card-tags {
  display: flex;
  gap: 0.5rem;
  margin: 0.5rem 0;
}
.novel-tag {
  font-size: 0.75rem;
  padding: 0.1rem 0.5rem;
  border: 1px solid var(--color-line);
  border-radius: 2px;
  color: var(--color-muted);
}
.novel-card-excerpt {
  margin: 0.5rem 0 0;
  color: var(--color-muted);
  font-size: 0.95rem;
}
.top-news-list {
  list-style: none;
  padding-left: 0;
}
.top-news-item {
  display: flex;
  gap: 1rem;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--color-line);
  font-size: 0.95rem;
}
.top-news-item time {
  font-family: var(--font-en);
  color: var(--color-muted);
  white-space: nowrap;
}

/* --- novels 本文（横書き長文） --- */
.novel-detail {
  max-width: var(--reading-width);
}
.novel-body p {
  text-indent: 1em;
}

/* --- gotop --- */
.gotop {
  position: fixed;
  right: 1.5rem;
  bottom: 1.5rem;
  font-family: var(--font-en);
  font-size: 0.8rem;
  padding: 0.4rem 0.7rem;
  border: 1px solid var(--color-line);
  background: var(--color-paper);
  color: var(--color-text);
  border-radius: 2px;
}

/* --- novels 一覧（partial: novels-list.html） --- */
.novel-card-cat {
  color: var(--color-accent);
}
.empty {
  color: var(--color-muted);
  padding: 2rem 0;
}

/* --- novels 詳細（partial: novel-detail.html） --- */
.novel-back {
  display: inline-block;
  font-family: var(--font-en);
  font-size: 0.85rem;
  margin-bottom: 1.5rem;
}
.novel-header {
  margin-bottom: 1.5rem;
}
.novel-title {
  font-size: 1.8rem;
  margin: 0 0 0.6rem;
  border-bottom: 0;
  padding-bottom: 0;
}
.novel-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  font-family: var(--font-en);
  font-size: 0.8rem;
  color: var(--color-muted);
}
.caution {
  margin: 1.5rem 0;
  padding: 0.9rem 1.1rem;
  border: 1px solid var(--color-line);
  border-radius: 2px;
  background: color-mix(in oklab, var(--color-text) 4%, transparent);
  font-size: 0.9rem;
}
.caution-title {
  font-weight: 700;
  margin: 0 0 0.4rem;
  color: var(--color-muted);
}
.caution p:last-child {
  margin: 0;
}
.novel-footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-line);
}
.novel-footer-back {
  font-family: var(--font-en);
  font-size: 0.9rem;
}

/* --- news 一覧（partial: news-list.html） --- */
.news-list {
  list-style: none;
  padding-left: 0;
}
.news-item {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1rem;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--color-line);
}
.news-date {
  font-family: var(--font-en);
  font-size: 0.8rem;
  color: var(--color-muted);
  white-space: nowrap;
}
.news-body {
  margin: 0;
  font-size: 0.95rem;
}

/* --- timeline（つぶやき）（partial: timeline-list.html） --- */
.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
}
.timeline-item {
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--color-line);
}
.timeline-item:first-child {
  padding-top: 0.5rem;
}
.timeline-item:last-child {
  border-bottom: 0;
}
.timeline-item.is-pinned {
  border-left: 2px solid var(--color-accent);
  padding: 1.5rem 1.1rem;
  background: color-mix(in oklab, var(--color-accent) 5%, transparent);
}
.timeline-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem 0.75rem;
  margin-bottom: 0.6rem;
  font-family: var(--font-en);
  font-size: 0.8rem;
  color: var(--color-muted);
}
.timeline-pin {
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  padding: 0.1rem 0.5rem;
  border-radius: 999px;
  color: var(--color-accent);
  background: color-mix(in oklab, var(--color-accent) 12%, transparent);
}
.timeline-time {
  color: var(--color-muted);
  white-space: nowrap;
}
.timeline-body {
  line-height: 1.85;
}
.timeline-body p {
  margin: 0 0 0.6rem;
  text-wrap: pretty;
}
.timeline-body p:last-child {
  margin-bottom: 0;
}
.timeline-media {
  margin-top: 0.9rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 0.5rem;
}
.timeline-media:has(a:only-child) {
  grid-template-columns: minmax(0, 320px);
}
.timeline-media a {
  display: block;
}
.timeline-media img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--color-line);
  border-radius: 2px;
}