:root {
  --bg-deep: #0a0e1a;
  --bg-surface: #111728;
  --bg-elevated: #161d33;
  --bg-elevated-2: #1a2342;

  --accent: #4f7df5;
  --accent-2: #22d3a7;
  --accent-glow: rgba(79, 125, 245, 0.35);

  --text-primary: #e8ecf4;
  --text-secondary: #8a93ad;
  --text-dim: #5b6480;

  --border: rgba(140, 160, 220, 0.10);
  --border-strong: rgba(140, 160, 220, 0.18);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;

  --shadow-lg: 0 24px 60px rgba(0,0,0,0.5);
  --shadow-glow: 0 0 0 1px rgba(79,125,245,0.35), 0 8px 28px rgba(79,125,245,0.25);

  --c-add:   #22d3a7;
  --c-imp:   #4f7df5;
  --c-fix:   #a78bfa;
  --c-know:  #f5a04f;
  --c-int:   #8a93ad;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html, body {
  background: var(--bg-deep);
  color: var(--text-primary);
  font-family: 'Inter', system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
}

/* ---------- Section ---------- */
.linkup-detailed-change-entries {
  position: relative;
  padding: clamp(80px, 10vw, 140px) 24px clamp(120px, 14vw, 180px);
  background:
    radial-gradient(700px 380px at 10% 0%, rgba(34,211,167,0.06), transparent 60%),
    var(--bg-deep);
  overflow: hidden;
}
.dc-grid-bg {
  position: absolute; inset: 0;
  background:
    radial-gradient(circle at 1px 1px, var(--border-strong) 1px, transparent 0);
  background-size: 32px 32px;
  opacity: 0.45;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 30%, #000 30%, transparent 80%);
  pointer-events: none;
}

.detailed-change-container {
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
}

/* ---------- Header ---------- */
.section-header { margin-bottom: 48px; }
.dc-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 16px;
}
.dc-eyebrow-mark { color: var(--accent-2); }

.section-title {
  font-size: clamp(36px, 5.5vw, 64px);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1;
  color: var(--text-primary);
}
.section-title em {
  font-style: italic;
  font-weight: 400;
  background: linear-gradient(100deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.dc-section-sub {
  margin-top: 18px;
  max-width: 580px;
  font-size: 15px;
  line-height: 1.65;
  color: var(--text-secondary);
}

/* ---------- Toolbar ---------- */
.dc-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
  margin-top: 32px;
  padding: 14px;
  background: var(--bg-surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
}
.dc-search {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1 1 280px;
  padding: 10px 14px;
  background: var(--bg-deep);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-dim);
  transition: border-color .25s, box-shadow .25s;
}
.dc-search:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(79,125,245,0.15);
  color: var(--accent);
}
.dc-search input {
  flex: 1;
  background: transparent;
  border: 0; outline: 0;
  color: var(--text-primary);
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
}
.dc-search input::placeholder { color: var(--text-dim); }
.dc-kbd {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--text-dim);
  padding: 2px 7px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-strong);
  border-radius: 4px;
}

.dc-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  padding: 4px;
  background: var(--bg-deep);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}
.dc-tab {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 7px 12px;
  background: transparent;
  border: 0;
  border-radius: 6px;
  cursor: pointer;
  transition: background .2s, color .2s;
}
.dc-tab:hover { color: var(--text-primary); }
.dc-tab.is-active {
  color: var(--text-primary);
  background: var(--bg-elevated-2);
  box-shadow: inset 0 0 0 1px var(--border-strong);
}

/* ---------- Layout ---------- */
.change-entries-wrapper {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 32px;
  align-items: start;
}

/* ---------- Sidebar ---------- */
.dc-sidebar {
  position: sticky;
  top: 24px;
  background: linear-gradient(180deg, var(--bg-surface), var(--bg-elevated));
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  padding: 18px;
  overflow: hidden;
}
.dc-sidebar-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
  padding: 4px 8px 12px;
  border-bottom: 1px dashed var(--border);
  margin-bottom: 12px;
}
.dc-version-nav { display: flex; flex-direction: column; gap: 4px; }
.dc-version-link {
  position: relative;
  display: grid;
  grid-template-columns: 12px auto 1fr auto;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-family: 'Inter', sans-serif;
  text-align: left;
  cursor: pointer;
  transition: background .2s, border-color .2s, transform .2s;
}
.dc-version-link:hover {
  background: var(--bg-elevated-2);
  border-color: var(--border);
}
.dc-version-link.is-active {
  background: rgba(79,125,245,0.08);
  border-color: rgba(79,125,245,0.3);
}
.dc-vl-arrow {
  font-family: 'JetBrains Mono', monospace;
  color: var(--text-dim);
  transition: color .2s, transform .2s;
}
.dc-version-link.is-active .dc-vl-arrow { color: var(--accent); transform: translateX(2px); }
.dc-vl-version {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  font-weight: 600;
  color: var(--accent);
}
.dc-vl-name {
  font-size: 12px;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.dc-version-link.is-active .dc-vl-name { color: var(--text-primary); }
.dc-vl-pill {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  color: var(--text-dim);
  padding: 2px 6px;
  background: var(--bg-deep);
  border-radius: 4px;
}

.dc-sidebar-footer {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px dashed var(--border);
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--text-dim);
}
.dc-sf-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent-2);
  box-shadow: 0 0 8px var(--accent-2);
}

/* ---------- Entries ---------- */
.dc-entries { display: flex; flex-direction: column; gap: 28px; }

.change-entry {
  position: relative;
  background: linear-gradient(180deg, var(--bg-surface) 0%, var(--bg-elevated) 100%);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  overflow: hidden;
  scroll-margin-top: 24px;
  transition: border-color .3s, box-shadow .3s;
}
.change-entry::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(135deg, rgba(79,125,245,0.4), transparent 40%, transparent 60%, rgba(34,211,167,0.3));
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity .35s;
  pointer-events: none;
}
.change-entry:hover::before { opacity: 1; }
.change-entry.is-flash { animation: dc-flash 1s ease; }
@keyframes dc-flash {
  0%   { box-shadow: 0 0 0 0 rgba(79,125,245,0.6); }
  100% { box-shadow: 0 0 0 16px rgba(79,125,245,0); }
}

/* Header */
.change-entry-header {
  padding: 24px 28px 20px;
  border-bottom: 1px dashed var(--border);
  background: linear-gradient(180deg, rgba(79,125,245,0.05), transparent);
}
.dc-header-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}
.dc-version-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 12px 5px 10px;
  background: rgba(79,125,245,0.10);
  border: 1px solid rgba(79,125,245,0.3);
  border-radius: 999px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  font-weight: 600;
}
.dc-vb-glyph { color: var(--accent-2); font-size: 10px; }
.dc-vb-num { color: var(--accent); }

.dc-header-actions { display: flex; gap: 8px; align-items: center; }
.dc-copy, .dc-permalink {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--text-dim);
  background: var(--bg-deep);
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  text-decoration: none;
  transition: color .2s, border-color .2s, background .2s;
}
.dc-copy:hover, .dc-permalink:hover {
  color: var(--accent);
  border-color: rgba(79,125,245,0.35);
}
.dc-copy.is-copied { color: var(--accent-2); border-color: rgba(34,211,167,0.4); }

.change-entry-version {
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 600;
  letter-spacing: -0.015em;
  color: var(--text-primary);
  line-height: 1.25;
}
.change-entry-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: 8px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--text-dim);
}
.dc-meta-status { color: var(--accent-2); }
.dc-meta-sep { opacity: 0.5; }
.dc-meta-stat { color: var(--text-secondary); }

/* Sections grid */
.change-entry-sections {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1px;
  background: var(--border);
}
.change-section {
  background: var(--bg-surface);
  padding: 22px 24px;
  transition: background .3s, opacity .3s;
}
.change-section.is-dim { opacity: 0.25; filter: saturate(0.4); }
.change-section.is-hidden { display: none; }

.change-section-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-secondary);
  padding-bottom: 12px;
  margin-bottom: 12px;
  border-bottom: 1px dashed var(--border);
}
.dc-cat-mark {
  display: inline-grid;
  place-items: center;
  width: 22px; height: 22px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 700;
  background: var(--bg-deep);
  border: 1px solid var(--border-strong);
}
.dc-mark-add  { color: var(--c-add);  border-color: rgba(34,211,167,0.4); }
.dc-mark-imp  { color: var(--c-imp);  border-color: rgba(79,125,245,0.4); }
.dc-mark-fix  { color: var(--c-fix);  border-color: rgba(167,139,250,0.4); }
.dc-mark-know { color: var(--c-know); border-color: rgba(245,160,79,0.4); }
.dc-mark-int  { color: var(--c-int);  border-color: var(--border-strong); }

/* List items */
.change-list { list-style: none; display: flex; flex-direction: column; gap: 8px; }
.change-list li {
  position: relative;
  padding: 8px 12px 8px 28px;
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--text-secondary);
  background: var(--bg-deep);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: color .2s, border-color .2s, transform .2s, background .2s;
}
.change-list li::before {
  content: '';
  position: absolute;
  left: 12px; top: 50%;
  transform: translateY(-50%);
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--text-dim);
  transition: background .2s, box-shadow .2s;
}
.change-list li:hover {
  color: var(--text-primary);
  border-color: var(--border-strong);
  transform: translateX(2px);
}
[data-category="added"]    .change-list li:hover { border-color: rgba(34,211,167,0.35); }
[data-category="added"]    .change-list li:hover::before { background: var(--c-add);  box-shadow: 0 0 8px var(--c-add); }
[data-category="improved"] .change-list li:hover { border-color: rgba(79,125,245,0.35); }
[data-category="improved"] .change-list li:hover::before { background: var(--c-imp);  box-shadow: 0 0 8px var(--c-imp); }
[data-category="fixed"]    .change-list li:hover { border-color: rgba(167,139,250,0.35); }
[data-category="fixed"]    .change-list li:hover::before { background: var(--c-fix);  box-shadow: 0 0 8px var(--c-fix); }
[data-category="known"]    .change-list li:hover { border-color: rgba(245,160,79,0.35); }
[data-category="known"]    .change-list li:hover::before { background: var(--c-know); box-shadow: 0 0 8px var(--c-know); }

.change-list li.is-match {
  background: rgba(79,125,245,0.08);
  border-color: rgba(79,125,245,0.4);
  color: var(--text-primary);
}
.change-list li mark {
  background: rgba(34,211,167,0.18);
  color: var(--accent-2);
  padding: 0 3px;
  border-radius: 3px;
}
.change-list li.is-no-match { display: none; }

/* Empty state */
.dc-empty {
  text-align: center;
  padding: 60px 20px;
  background: var(--bg-surface);
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-lg);
}
.dc-empty-glyph {
  font-size: 48px;
  color: var(--text-dim);
  font-family: 'JetBrains Mono', monospace;
  margin-bottom: 12px;
}
.dc-empty-text {
  color: var(--text-secondary);
  font-size: 14px;
  margin-bottom: 16px;
}
.dc-empty-reset {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  padding: 8px 16px;
  background: var(--bg-elevated-2);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  cursor: pointer;
  transition: border-color .2s, color .2s;
}
.dc-empty-reset:hover { border-color: var(--accent); color: var(--accent); }

/* Toast */
.dc-toast {
  position: fixed;
  left: 50%;
  bottom: 32px;
  transform: translate(-50%, 100px);
  padding: 12px 20px;
  background: var(--bg-elevated-2);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  color: var(--text-primary);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  pointer-events: none;
  transition: transform .3s ease, opacity .3s ease;
  z-index: 100;
}
.dc-toast.is-show {
  transform: translate(-50%, 0);
  opacity: 1;
}
.dc-toast::before {
  content: '✓';
  margin-right: 8px;
  color: var(--accent-2);
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .change-entries-wrapper { grid-template-columns: 1fr; }
  .dc-sidebar { position: static; }
  .dc-version-nav { flex-direction: row; overflow-x: auto; gap: 8px; padding-bottom: 4px; }
  .dc-version-link { flex: 0 0 auto; grid-template-columns: auto auto; gap: 6px; }
  .dc-vl-name, .dc-vl-pill { display: none; }
}
@media (max-width: 560px) {
  .change-entry-header { padding: 18px 18px 16px; }
  .change-section { padding: 18px; }
  .dc-header-top { flex-direction: column; align-items: flex-start; }
  .dc-tabs { width: 100%; overflow-x: auto; flex-wrap: nowrap; }
  .dc-tab { white-space: nowrap; }
}

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