/* ---------- デザイントークン ---------- */
:root {
  --bg: #161513;
  --surface: #1e1d19;
  --surface-hover: #262420;
  --ink: #f3efe6;
  --muted: #928d83;
  --line: #322f29;
  --line-strong: #4a453c;
  --accent: #c1613f;

  --font-serif: "Source Serif 4", Georgia, serif;
  --font-sans: "Inter", -apple-system, "Hiragino Sans", "Yu Gothic", sans-serif;
}

/* アクセントカラーはこの4種類から選択できる（既定はterracotta） */
:root[data-accent="terracotta"] { --accent: #c1613f; }
:root[data-accent="indigo"]     { --accent: #4a5b8c; }
:root[data-accent="moss"]       { --accent: #5c7052; }
:root[data-accent="mustard"]    { --accent: #c99a3d; }

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
}

button, input, textarea {
  font-family: inherit;
  color: inherit;
}

/* ---------- 全体レイアウト ---------- */
.app {
  display: flex;
  min-height: 100vh;
}

/* ---------- サイドバー ---------- */
.sidebar {
  width: 240px;
  flex: 0 0 240px;
  padding: 48px 32px;
  border-right: 1px solid var(--line);
  position: sticky;
  top: 0;
  height: 100vh;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 8px;
}

.brand-mark {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 28px;
  color: var(--accent);
}

.brand-name {
  font-family: var(--font-serif);
  font-size: 19px;
  letter-spacing: 0.01em;
}

.brand-tagline {
  font-size: 13px;
  color: var(--muted);
  margin: 0 0 48px;
}

.site-nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.nav-link {
  text-align: left;
  background: none;
  border: none;
  border-left: 2px solid transparent;
  font-size: 14px;
  color: var(--muted);
  cursor: pointer;
  padding: 10px 0 10px 16px;
  transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}

.nav-link:hover {
  color: var(--ink);
  background: var(--surface);
}

.nav-link.is-active {
  color: var(--accent);
  border-left-color: var(--accent);
  background: var(--surface);
}

/* ---------- アクセントカラー選択 ---------- */
.accent-picker {
  margin-top: 56px;
}

.swatches {
  display: flex;
  gap: 10px;
  margin-top: 10px;
}

.swatch {
  width: 18px;
  height: 18px;
  padding: 0;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  background: var(--swatch);
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.swatch:hover { transform: scale(1.12); }

.swatch.is-active {
  box-shadow: 0 0 0 2px var(--bg), 0 0 0 4px var(--swatch);
}

/* 管理者としてログインしていない間は管理者専用の要素を隠す */
body[data-admin="false"] .admin-only {
  display: none;
}

.admin-panel {
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.admin-link {
  background: none;
  border: none;
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--muted);
  cursor: pointer;
  padding: 0;
  transition: color 0.15s ease;
}

.admin-link:hover { color: var(--ink); }

/* ---------- メインコンテンツ ---------- */
.content {
  flex: 1;
  max-width: 720px;
  margin: 0 auto;
  padding: 72px 40px 140px;
}

.view { display: none; }

.view.is-active {
  display: block;
  animation: rise-in 0.4s ease;
}

@keyframes rise-in {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.page-title {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 34px;
  letter-spacing: -0.01em;
  margin: 0 0 48px;
  line-height: 1.3;
}

/* ---------- 記事インデックス（一覧） ---------- */
.article-index {
  list-style: none;
  margin: 0;
  padding: 0;
}

.article-index li {
  padding: 26px 0;
  border-top: 1px solid var(--line);
  cursor: pointer;
  transition: opacity 0.15s ease;
}

.article-index li:last-child {
  border-bottom: 1px solid var(--line);
}

.article-index .article-date {
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--muted);
  margin: 0 0 8px;
}

/* 日付の前に小さなアクセントカラーの点を置く */
.article-index .article-date::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  margin-right: 8px;
  vertical-align: middle;
}

.article-index .article-title {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 21px;
  margin: 0 0 8px;
  line-height: 1.45;
  transition: color 0.15s ease;
}

.article-index li:hover .article-title {
  color: var(--accent);
}

.article-index .article-excerpt {
  font-size: 14px;
  color: var(--muted);
  margin: 0;
  line-height: 1.7;
  max-width: 56ch;
}

/* ホーム画面の先頭記事だけ大きく見せる */
#home-list li:first-child {
  padding-bottom: 32px;
}

#home-list li:first-child .article-title {
  font-size: 30px;
  line-height: 1.4;
  margin-bottom: 12px;
}

#home-list li:first-child .article-excerpt {
  font-size: 15px;
  max-width: 60ch;
}

.empty-state {
  color: var(--muted);
  font-size: 14px;
  padding: 28px 0;
  border-top: 1px solid var(--line);
}

/* ---------- タグ ---------- */
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
}

.tag-pill {
  font-size: 11px;
  letter-spacing: 0.02em;
  color: var(--muted);
  background: none;
  border: 1px solid var(--line);
  padding: 3px 10px;
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.tag-pill:hover {
  color: var(--ink);
  border-color: var(--line-strong);
}

/* ---------- 過去記事の絞り込み ---------- */
.filter-row {
  margin-bottom: 24px;
}

.date-range {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 10px;
}

.date-range input[type="date"] {
  font-size: 14px;
  border: 1px solid var(--line);
  background: var(--surface);
  padding: 9px 12px;
  outline: none;
  transition: border-color 0.15s ease;
}

.date-range input[type="date"]:focus { border-color: var(--line-strong); }

.date-range-sep {
  color: var(--muted);
  font-size: 13px;
}

.tag-filter-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}

.tag-filter-chip {
  font-size: 12px;
  color: var(--muted);
  background: none;
  border: 1px solid var(--line);
  padding: 6px 14px;
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}

.tag-filter-chip:hover { color: var(--ink); }

.tag-filter-chip.is-active {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--surface);
}

#archive-filter-clear {
  margin-bottom: 40px;
}

/* ---------- フォーム ---------- */
.field, .search-field {
  display: block;
  margin-bottom: 28px;
}

.field-label {
  display: block;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--muted);
  margin-bottom: 10px;
}

#input-title {
  font-family: var(--font-serif);
  font-size: 26px;
  width: 100%;
  border: none;
  border-bottom: 1px solid var(--line);
  padding: 10px 0;
  background: transparent;
  outline: none;
  transition: border-color 0.15s ease;
}

#input-title::placeholder { color: var(--muted); }
#input-title:focus { border-bottom-color: var(--ink); }

#input-body {
  width: 100%;
  font-size: 15px;
  line-height: 1.9;
  border: 1px solid var(--line);
  background: var(--surface);
  padding: 20px;
  resize: vertical;
  outline: none;
  transition: border-color 0.15s ease;
}

#input-body::placeholder { color: var(--muted); }
#input-body:focus { border-color: var(--line-strong); }

#archive-search {
  width: 100%;
  font-size: 15px;
  border: 1px solid var(--line);
  background: var(--surface);
  padding: 12px 16px;
  outline: none;
  transition: border-color 0.15s ease;
}

#archive-search::placeholder { color: var(--muted); }
#archive-search:focus { border-color: var(--line-strong); }

/* ---------- Markdownエディタ（タブ切り替え） ---------- */
.editor-tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 12px;
}

.tab-btn {
  background: none;
  border: 1px solid var(--line);
  border-bottom: none;
  color: var(--muted);
  font-size: 13px;
  padding: 8px 18px;
  cursor: pointer;
  transition: color 0.15s ease, background 0.15s ease;
}

.tab-btn:hover { color: var(--ink); }

.tab-btn.is-active {
  color: var(--ink);
  background: var(--surface);
}

.editor-pane[data-pane="preview"] {
  min-height: 320px;
  border: 1px solid var(--line);
  background: var(--surface);
  padding: 20px 24px;
}

/* ---------- Markdown本文の見た目（記事・プレビュー共通） ---------- */
.markdown-body h1,
.markdown-body h2,
.markdown-body h3 {
  font-family: var(--font-serif);
  line-height: 1.5;
  margin: 1.4em 0 0.6em;
}

.markdown-body h1 { font-size: 24px; }
.markdown-body h2 { font-size: 21px; }
.markdown-body h3 { font-size: 18px; }

.markdown-body p,
.markdown-body ul,
.markdown-body ol {
  font-size: 15px;
  line-height: 1.9;
  margin: 0 0 1em;
}

.markdown-body ul, .markdown-body ol { padding-left: 1.4em; }

.markdown-body a { color: var(--accent); }

.markdown-body code {
  font-family: "SFMono-Regular", Menlo, Consolas, monospace;
  font-size: 13px;
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 2px 6px;
}

.markdown-body pre {
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 16px 20px;
  overflow-x: auto;
  margin: 0 0 1.2em;
}

.markdown-body pre code {
  border: none;
  padding: 0;
  background: none;
}

.markdown-body blockquote {
  margin: 0 0 1.2em;
  padding-left: 16px;
  border-left: 2px solid var(--accent);
  color: var(--muted);
}

.form-actions {
  display: flex;
  align-items: center;
  gap: 18px;
}

/* ---------- ボタン類 ---------- */
.btn-primary {
  background: var(--accent);
  color: var(--ink);
  border: 1px solid var(--accent);
  padding: 12px 28px;
  font-size: 14px;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: opacity 0.15s ease;
}

.btn-primary:hover { opacity: 0.85; }

.btn-ghost {
  background: none;
  border: 1px solid var(--line);
  color: var(--muted);
  padding: 12px 28px;
  font-size: 14px;
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.btn-ghost:hover { color: var(--ink); border-color: var(--line-strong); }

.toast {
  font-size: 13px;
  color: var(--accent);
  opacity: 0;
  animation: fade-in 0.3s ease forwards;
}

@keyframes fade-in {
  from { opacity: 0; transform: translateY(2px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- 記事詳細ダイアログ ---------- */
.article-dialog {
  border: 1px solid var(--line-strong);
  background: var(--bg);
  color: var(--ink);
  max-width: 640px;
  width: 90vw;
  max-height: 85vh;
  overflow-y: auto;
  padding: 48px;
}

.article-dialog::backdrop {
  background: rgba(10, 9, 8, 0.6);
}

.dialog-date {
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--muted);
  margin: 0 0 10px;
}

.dialog-date::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  margin-right: 8px;
  vertical-align: middle;
}

.dialog-title {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 28px;
  line-height: 1.4;
  margin: 0 0 28px;
}

.dialog-body {
  margin-bottom: 36px;
}

.dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
}

/* ---------- コメント欄 ---------- */
.comments-section {
  border-top: 1px solid var(--line);
  padding-top: 28px;
  margin-bottom: 28px;
}

.comments-heading {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 16px;
  margin: 0 0 20px;
}

.comment-list {
  list-style: none;
  margin: 0 0 24px;
  padding: 0;
}

.comment-list li {
  padding: 14px 0;
  border-top: 1px solid var(--line);
}

.comment-list li:last-child {
  border-bottom: 1px solid var(--line);
}

.comment-meta {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 6px;
}

.comment-author {
  font-size: 13px;
  font-weight: 600;
}

.comment-date {
  font-size: 12px;
  color: var(--muted);
}

.comment-text {
  font-size: 14px;
  line-height: 1.8;
  white-space: pre-wrap;
  margin: 0;
}

.comment-form .field { margin-bottom: 16px; }

.comment-form textarea {
  width: 100%;
  font-size: 14px;
  line-height: 1.7;
  border: 1px solid var(--line);
  background: var(--surface);
  padding: 12px 14px;
  resize: vertical;
  outline: none;
  transition: border-color 0.15s ease;
}

.comment-form textarea:focus { border-color: var(--line-strong); }

.comment-form input[type="text"] {
  width: 100%;
  font-size: 14px;
  border: 1px solid var(--line);
  background: var(--surface);
  padding: 10px 14px;
  outline: none;
  transition: border-color 0.15s ease;
}

.comment-form input[type="text"]:focus { border-color: var(--line-strong); }

/* ---------- レスポンシブ ---------- */
@media (max-width: 780px) {
  .app { flex-direction: column; }

  .sidebar {
    width: 100%;
    flex: none;
    position: static;
    height: auto;
    padding: 28px 24px;
    border-right: none;
    border-bottom: 1px solid var(--line);
  }

  .brand-tagline { margin-bottom: 24px; }

  .site-nav { flex-direction: row; gap: 8px; }

  .accent-picker { margin-top: 20px; }

  .nav-link {
    border-left: none;
    border-bottom: 2px solid transparent;
    padding: 8px 12px;
  }

  .nav-link.is-active { border-bottom-color: var(--ink); }

  .content { padding: 44px 24px 100px; }
  .page-title { font-size: 27px; }
  #home-list li:first-child .article-title { font-size: 24px; }
}

@media (prefers-reduced-motion: reduce) {
  .view.is-active { animation: none; }
  .toast { animation: none; opacity: 1; }
}