/* A-COUNTER X 更新履歴ページ専用 CSS。
 *  ランディングページのテーマ (シアン×ゴールド) に合わせつつ、
 *  情報密度の高い changelog 表示に最適化したレイアウト。 */

:root {
  --cl-bg: #0a0a14;
  --cl-bg-card: #14141d;
  --cl-bg-elev: #1a1a26;
  --cl-border: #222230;
  --cl-text: #eaeaea;
  --cl-text-dim: #a8a8b8;
  --cl-text-muted: #707080;
  --cl-cyan: #00e5ff;
  --cl-gold: #ffd700;
  --cl-green: #22c55e;
  --cl-red: #f87171;
  --cl-orange: #f97316;
  --cl-purple: #a855f7;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--cl-bg);
  color: var(--cl-text);
  font-family: "Hiragino Kaku Gothic Pro", "Hiragino Sans", "Yu Gothic", "Meiryo", system-ui, sans-serif;
  font-size: 15px;
  line-height: 1.7;
}

/* ===== Header ===== */
.cl-header {
  background: linear-gradient(135deg, #0c0c1a, #14141d);
  border-bottom: 1px solid var(--cl-border);
  padding: 32px 0 24px;
  position: relative;
  overflow: hidden;
}
.cl-header::before {
  /* 上部のシアングロー装飾 */
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at top, rgba(0, 229, 255, 0.08), transparent 60%);
  pointer-events: none;
}
.cl-header-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
}
.cl-back {
  display: inline-block;
  color: var(--cl-cyan);
  text-decoration: none;
  font-size: 13px;
  margin-bottom: 12px;
  padding: 4px 0;
  transition: opacity 0.15s;
}
.cl-back:hover {
  opacity: 0.7;
  text-decoration: underline;
}
.cl-header h1 {
  margin: 0 0 6px;
  font-size: 28px;
  color: var(--cl-cyan);
  letter-spacing: 2px;
}
.cl-subtitle {
  margin: 0;
  color: var(--cl-text-dim);
  font-size: 14px;
}

/* ===== Toolbar (Sticky) ===== */
.cl-toolbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(10, 10, 20, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--cl-border);
  padding: 14px 0;
}
.cl-toolbar-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

/* Search */
.cl-search {
  position: relative;
  flex: 1 1 280px;
  min-width: 200px;
}
.cl-search-icon {
  position: absolute;
  left: 10px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--cl-text-muted);
  font-size: 14px;
  pointer-events: none;
}
.cl-search input {
  width: 100%;
  padding: 9px 36px 9px 32px;
  background: var(--cl-bg-elev);
  border: 1px solid var(--cl-border);
  border-radius: 6px;
  color: var(--cl-text);
  font-family: inherit;
  font-size: 14px;
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.cl-search input:focus {
  border-color: var(--cl-cyan);
  box-shadow: 0 0 0 2px rgba(0, 229, 255, 0.15);
}
.cl-search input::placeholder {
  color: var(--cl-text-muted);
}
#cl-search-clear {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  background: transparent;
  border: none;
  color: var(--cl-text-muted);
  font-size: 18px;
  width: 22px;
  height: 22px;
  cursor: pointer;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
}
#cl-search-clear:hover {
  background: rgba(255, 255, 255, 0.08);
  color: var(--cl-text);
}

/* Filters */
.cl-filters {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.cl-filter-label {
  font-size: 12px;
  color: var(--cl-text-muted);
  letter-spacing: 0.5px;
}
.cl-filter-buttons {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}
.cl-chip {
  padding: 5px 12px;
  background: var(--cl-bg-elev);
  border: 1px solid var(--cl-border);
  border-radius: 14px;
  color: var(--cl-text-dim);
  font-size: 12px;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
}
.cl-chip:hover {
  border-color: var(--cl-cyan);
  color: var(--cl-text);
}
.cl-chip.is-active {
  background: rgba(0, 229, 255, 0.12);
  border-color: var(--cl-cyan);
  color: var(--cl-cyan);
  font-weight: 600;
}

.cl-stats {
  margin-left: auto;
  font-size: 12px;
  color: var(--cl-text-muted);
  white-space: nowrap;
}

/* ===== Main Layout ===== */
.cl-main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px;
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 32px;
}

/* Sidebar (Version TOC) */
.cl-sidebar {
  position: sticky;
  top: 80px;
  align-self: start;
  max-height: calc(100vh - 100px);
  overflow-y: auto;
  padding-right: 8px;
}
.cl-sidebar-title {
  font-size: 11px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--cl-text-muted);
  font-weight: 600;
  padding: 4px 8px;
  margin-bottom: 8px;
  border-bottom: 1px solid var(--cl-border);
}
.cl-sidebar-list {
  display: flex;
  flex-direction: column;
  gap: 1px;
}
.cl-sidebar-link {
  display: flex;
  justify-content: space-between;
  padding: 6px 8px;
  border-radius: 4px;
  text-decoration: none;
  color: var(--cl-text-dim);
  font-size: 12px;
  font-family: "JetBrains Mono", monospace;
  transition: background 0.1s;
}
.cl-sidebar-link:hover {
  background: rgba(0, 229, 255, 0.08);
  color: var(--cl-cyan);
}
.cl-sidebar-link .cl-sidebar-date {
  color: var(--cl-text-muted);
  font-size: 11px;
}

/* ===== Content ===== */
.cl-content {
  min-width: 0; /* prevent grid blowup */
}

.cl-loading,
.cl-empty {
  text-align: center;
  padding: 60px 20px;
  color: var(--cl-text-muted);
  font-size: 14px;
}

/* Version Card */
.cl-version {
  background: var(--cl-bg-card);
  border: 1px solid var(--cl-border);
  border-radius: 10px;
  padding: 24px;
  margin-bottom: 16px;
  scroll-margin-top: 90px; /* sticky toolbar の下に来るよう調整 */
  transition: border-color 0.15s;
}
.cl-version.is-latest {
  border-color: rgba(0, 229, 255, 0.4);
  box-shadow: 0 0 0 1px rgba(0, 229, 255, 0.2), 0 4px 16px rgba(0, 229, 255, 0.08);
}
.cl-version-header {
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--cl-border);
}
.cl-version-num {
  font-family: "JetBrains Mono", monospace;
  font-size: 22px;
  font-weight: 700;
  color: var(--cl-cyan);
  letter-spacing: 0.5px;
}
.cl-version-latest-badge {
  display: inline-block;
  padding: 2px 8px;
  background: var(--cl-gold);
  color: #1a1a22;
  border-radius: 10px;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1px;
}
.cl-version-date {
  font-size: 13px;
  color: var(--cl-text-dim);
  font-family: "JetBrains Mono", monospace;
}
.cl-version-target {
  font-size: 11px;
  padding: 2px 8px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 4px;
  color: var(--cl-text-dim);
}

/* Section inside a version */
.cl-section {
  margin: 16px 0;
}
.cl-section-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--cl-gold);
  margin: 0 0 8px;
  padding: 4px 0;
}
/* Section title カテゴリ別カラー (簡易判別用) */
.cl-section-title[data-cat="新機能"] { color: var(--cl-cyan); }
.cl-section-title[data-cat="バグ修正"] { color: var(--cl-red); }
.cl-section-title[data-cat="UX 改善"] { color: var(--cl-green); }
.cl-section-title[data-cat="仕様"] { color: var(--cl-orange); }
.cl-section-title[data-cat="レイアウト"] { color: var(--cl-purple); }

.cl-section-body {
  color: var(--cl-text);
  font-size: 14px;
}
.cl-section-body ul {
  margin: 4px 0 0;
  padding-left: 22px;
}
.cl-section-body li {
  margin-bottom: 4px;
}
.cl-section-body li::marker {
  color: var(--cl-text-muted);
}
.cl-section-body p {
  margin: 0 0 8px;
}
.cl-section-body strong {
  color: var(--cl-text);
  font-weight: 700;
}
.cl-section-body code {
  background: rgba(0, 229, 255, 0.08);
  border: 1px solid rgba(0, 229, 255, 0.18);
  padding: 1px 6px;
  border-radius: 3px;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.88em;
  color: var(--cl-cyan);
  word-break: break-all;
}

/* Search highlight */
.cl-highlight {
  background: rgba(255, 215, 0, 0.25);
  color: var(--cl-gold);
  padding: 0 2px;
  border-radius: 2px;
  font-weight: 600;
}

/* ===== Footer ===== */
.cl-footer {
  border-top: 1px solid var(--cl-border);
  padding: 24px 0 32px;
  margin-top: 40px;
}
.cl-footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  text-align: center;
  font-size: 13px;
  color: var(--cl-text-dim);
}
.cl-footer a {
  color: var(--cl-cyan);
  text-decoration: none;
}
.cl-footer a:hover {
  text-decoration: underline;
}
.cl-footer-small {
  margin-top: 8px;
  font-size: 11px;
  color: var(--cl-text-muted);
}
.cl-footer-small code {
  background: rgba(255, 255, 255, 0.04);
  padding: 1px 5px;
  border-radius: 3px;
  font-family: "JetBrains Mono", monospace;
}

/* ===== Scroll-to-top Button (トップページ /style.css の .scroll-to-top と統一) =====
 *  デザインソース: landing-page/style.css の `.scroll-to-top` ルール。
 *  独立した changelog.css でも違和感が出ないよう、同じ規約で再記述。 */
.scroll-to-top {
  position: fixed;
  right: 20px;
  bottom: 20px;
  width: 46px;
  height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  background: rgba(10, 10, 16, 0.85);
  color: var(--cl-cyan);
  border: 1px solid rgba(0, 229, 255, 0.5);
  border-radius: 50%;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity 220ms ease, transform 220ms ease,
    border-color 160ms ease, box-shadow 160ms ease, background 160ms ease;
  box-shadow: 0 0 14px rgba(0, 229, 255, 0.25),
    0 4px 14px rgba(0, 0, 0, 0.45);
  z-index: 200;
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
}
.scroll-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.scroll-to-top:hover {
  border-color: var(--cl-cyan);
  background: rgba(0, 229, 255, 0.12);
  box-shadow: 0 0 22px rgba(0, 229, 255, 0.55),
    0 4px 16px rgba(0, 0, 0, 0.45);
}
.scroll-to-top:active {
  transform: translateY(2px);
}
.scroll-to-top svg {
  width: 22px;
  height: 22px;
  filter: drop-shadow(0 0 4px rgba(0, 229, 255, 0.55));
}
@media (max-width: 768px) {
  .scroll-to-top {
    right: 14px;
    bottom: 14px;
    width: 42px;
    height: 42px;
  }
  .scroll-to-top svg {
    width: 20px;
    height: 20px;
  }
}

/* ===== Responsive ===== */
@media (max-width: 800px) {
  .cl-main {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .cl-sidebar {
    position: static;
    max-height: 240px;
    border: 1px solid var(--cl-border);
    border-radius: 8px;
    padding: 12px;
    overflow-y: auto;
  }
  .cl-sidebar-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    gap: 4px;
  }
  .cl-sidebar-link .cl-sidebar-date {
    display: none;
  }
  .cl-version {
    padding: 16px;
  }
  .cl-version-num {
    font-size: 18px;
  }
  .cl-toolbar-inner {
    padding: 0 16px;
  }
  .cl-stats {
    margin-left: 0;
    width: 100%;
    text-align: right;
  }
}

@media (max-width: 480px) {
  .cl-header h1 {
    font-size: 22px;
  }
  .cl-filters {
    width: 100%;
  }
}