:root {
  --bg: #0F172A;
  --card: #1B2336;
  --ink: #F8FAFC;
  --muted: #94A3B8;
  --line: #334155;
  --human: #22D3EE;
  --human-soft: rgba(34, 211, 238, 0.08);
  --assistant: #22C55E;
  --assistant-soft: rgba(34, 197, 94, 0.08);
  --accent: #22C55E;
  --accent-bright: #4ADE80;
  --danger: #EF4444;
  --danger-bright: #F87171;
  --chip-bg: #272F42;
  --chip-border: #475569;
  --warn-bg: rgba(239, 68, 68, 0.09);
  --warn-border: #EF4444;
  /* Code blocks stay near-black in every state. */
  --code-bg: #0D1117;
  --code-border: #334155;
  --code-ink: #E6EDF3;
  --code-muted: #8B949E;
  --accent-from: #22C55E;
  --accent-to: #22D3EE;
  --font-sans: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, "Helvetica Neue", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --radius: 16px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 15px/1.6 var(--font-sans);
  -webkit-font-smoothing: antialiased;
}

button { cursor: pointer; }

/* Gradient hairline across the very top of the page. */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 50;
  background: linear-gradient(90deg, var(--accent-from), var(--accent-to));
}

::selection { background: rgba(34, 197, 94, 0.32); }

/* ---------- Single sticky topbar ---------- */

.topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  background: var(--card);
  border-bottom: 1px solid var(--line);
}

.bar-row {
  max-width: 1280px;
  margin: 0 auto;
  padding: 8px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.bar-controls {
  border-top: 1px solid color-mix(in srgb, var(--line) 55%, transparent);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-right: auto;
  min-width: 0;
}

.brand-mark {
  width: 26px;
  height: 26px;
  flex: none;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--accent-from), var(--accent-to));
  background-image: url("icon.svg");
  background-size: cover;
}

.brand-name {
  font-weight: 700;
  letter-spacing: -0.01em;
  font-size: 16px;
  white-space: nowrap;
}

.brand-name::before {
  content: ">_ ";
  font-family: var(--font-mono);
  color: var(--accent-bright);
}

.top-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

h1 {
  margin: 0 0 6px;
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.meta {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  font-family: var(--font-mono);
  font-size: 12.5px;
}

/* ---------- Two-column layout ---------- */

.layout {
  display: grid;
  grid-template-columns: 340px minmax(0, 1fr);
  gap: 20px;
  align-items: start;
  max-width: 1280px;
  margin: 0 auto;
  padding: 20px 20px 70px;
}

.sidebar {
  position: sticky;
  top: 120px;
  min-width: 0;
  max-height: calc(100vh - 140px);
  overflow-y: auto;
}

.side-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  overflow-wrap: break-word;
}

.side-head {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 18px 0;
}

.status-dot {
  width: 8px;
  height: 8px;
  flex: none;
  border-radius: 50%;
  background: var(--accent);
}

.side-eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-bright);
}

.side-eyebrow::before {
  content: "# ";
  color: var(--muted);
}

.side-card h1 {
  font-size: 21px;
  padding: 8px 18px 0;
}

.stats {
  padding: 12px 18px 0;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.stat {
  background: rgba(0, 0, 0, 0.28);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 8px 4px;
  text-align: center;
}

.stat-v {
  font-family: var(--font-mono);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.2;
  font-variant-numeric: tabular-nums;
}

.stat-k {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  margin-top: 2px;
}

.stat.is-human .stat-v { color: var(--human); }
.stat.is-assistant .stat-v { color: var(--accent-bright); }

.stat-rows {
  margin-top: 10px;
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.stat-row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 4px 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
}

.stat-rk {
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 10.5px;
}

.stat-rv {
  text-align: right;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 100%;
  font-variant-numeric: tabular-nums;
}

.stat-bar {
  flex-basis: 100%;
  height: 4px;
  border-radius: 4px;
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid var(--line);
  overflow: hidden;
}

.stat-fill {
  height: 100%;
  border-radius: 4px;
  background: linear-gradient(90deg, var(--accent-from), var(--accent-to));
  transition: width 0.3s ease;
}

.side-label {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  padding: 14px 18px 0;
}

.side-label::before {
  content: "# ";
  color: var(--accent);
}

.brief-toggle {
  background: none;
  border: none;
  width: 100%;
  text-align: left;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  color: inherit;
  font: inherit;
}

.brief-twisty {
  display: inline-block;
  color: var(--accent);
}

.brief-toggle[aria-expanded="true"] .brief-twisty {
  transform: rotate(90deg);
}

.summary.collapsed {
  display: none;
}

.summary {
  margin: 8px 18px 18px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--muted);
  white-space: pre-wrap;
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px 12px;
  max-height: 40vh;
  overflow-y: auto;
}

.summary::-webkit-scrollbar, .sidebar::-webkit-scrollbar { width: 8px; }
.summary::-webkit-scrollbar-thumb, .sidebar::-webkit-scrollbar-thumb {
  background: var(--line);
  border-radius: 8px;
}
.summary::-webkit-scrollbar-track, .sidebar::-webkit-scrollbar-track { background: transparent; }

.content {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* ---------- Toolbar controls (second row of the topbar) ---------- */

.file-btn {
  background: var(--accent);
  color: #0F172A;
  padding: 7px 14px;
  border-radius: 10px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 700;
  font-family: var(--font-sans);
  transition: background-color 0.16s ease, border-color 0.16s ease;
}

.file-btn:hover { background: var(--accent-bright); }

.file-name {
  color: var(--muted);
  font-size: 12.5px;
  font-family: var(--font-mono);
}

.ghost-btn {
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink);
  padding: 7px 14px;
  border-radius: 10px;
  cursor: pointer;
  font-size: 13.5px;
  font-weight: 600;
  transition: border-color 0.16s ease, opacity 0.16s ease, background-color 0.16s ease;
}

.ghost-btn:hover:not(:disabled) {
  border-color: var(--accent);
  background: rgba(34, 197, 94, 0.08);
}

.ghost-btn:disabled {
  opacity: 0.45;
  cursor: default;
}

.filters {
  display: flex;
  gap: 6px;
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--line);
  padding: 3px;
  border-radius: 999px;
}

.filters button {
  border: 0;
  background: transparent;
  color: var(--muted);
  border-radius: 999px;
  padding: 5px 14px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  font-family: var(--font-mono);
  transition: background 0.16s ease, color 0.16s ease;
}

.filters button:hover { color: var(--ink); }

.filters button.active {
  background: rgba(34, 197, 94, 0.16);
  color: var(--accent-bright);
}

#search {
  flex: 1;
  min-width: 170px;
  padding: 8px 12px 8px 34px;
  border: 1px solid var(--line);
  border-radius: 10px;
  font-size: 14px;
  font-family: var(--font-mono);
  color: var(--ink);
  caret-color: var(--accent);
  background-color: rgba(0, 0, 0, 0.3);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='15' height='15' viewBox='0 0 24 24' fill='none' stroke='%2394A3B8' stroke-width='2.4' stroke-linecap='round'%3E%3Ccircle cx='11' cy='11' r='7'/%3E%3Cpath d='M20 20l-3.5-3.5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: 11px center;
  transition: border-color 0.16s ease;
}

#search:focus {
  outline: none;
  border-color: var(--accent);
}

.match-count {
  font-size: 12.5px;
  font-family: var(--font-mono);
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

button:focus-visible,
label.file-btn:focus-visible,
#search:focus-visible,
input[type="file"]:focus-visible + * {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ---------- Timeline cards ---------- */

#timeline {
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-width: 0;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px 18px 16px;
  overflow-wrap: break-word;
}

.card.human {
  border-left: 2px solid var(--human);
  background: linear-gradient(to bottom, var(--human-soft) 0, transparent 90px), var(--card);
}

.card.assistant {
  border-left: 2px solid var(--assistant);
  background: linear-gradient(to bottom, var(--assistant-soft) 0, transparent 90px), var(--card);
}

.card-head {
  display: flex;
  gap: 10px;
  align-items: center;
  margin-bottom: 10px;
  flex-wrap: wrap;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 3px 10px;
  border-radius: 6px;
  border: 1px solid transparent;
}

.badge::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: currentColor;
}

.human .badge {
  background: var(--human-soft);
  color: var(--human);
  border-color: rgba(34, 211, 238, 0.3);
}

.assistant .badge {
  background: var(--assistant-soft);
  color: var(--accent-bright);
  border-color: rgba(34, 197, 94, 0.3);
}

.time {
  font-size: 12.5px;
  font-family: var(--font-mono);
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.uuid {
  margin-left: auto;
  font-size: 11px;
  color: var(--muted);
  font-family: var(--font-mono);
  opacity: 0.75;
}

/* ---------- Message typography ---------- */

.body { font-size: 14.5px; }
.body > :first-child { margin-top: 0; }
.body > :last-child { margin-bottom: 0; }

.body h1, .body h2, .body h3, .body h4 {
  letter-spacing: -0.01em;
  line-height: 1.3;
  margin: 1.1em 0 0.5em;
}

.body h1 { font-size: 20px; }
.body h2 { font-size: 18px; }
.body h3 { font-size: 16px; }
.body h4 { font-size: 15px; }

.body p { margin: 0.65em 0; }
.body ul, .body ol { margin: 0.6em 0; padding-left: 1.5em; }
.body li + li { margin-top: 0.25em; }

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

.body hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 1.2em 0;
}

.body table {
  border-collapse: collapse;
  width: 100%;
  margin: 0.8em 0;
  font-size: 13.5px;
  display: block;
  overflow-x: auto;
}

.body th, .body td {
  border: 1px solid var(--line);
  padding: 6px 10px;
  text-align: left;
}

.body th {
  background: rgba(255, 255, 255, 0.05);
  font-family: var(--font-mono);
  font-size: 12.5px;
}

.body tr:nth-child(even) td { background: rgba(255, 255, 255, 0.02); }

.body img { max-width: 100%; border-radius: 8px; }

.body blockquote {
  margin: 0 0 12px;
  padding: 9px 13px;
  border-left: 2px solid var(--warn-border);
  background: var(--warn-bg);
  border-radius: 0 10px 10px 0;
  font-size: 13.5px;
}

.body blockquote p { margin: 0.3em 0; }

/* ---------- Code: near-black blocks, collapsible, status-badged ---------- */

.codeblock {
  position: relative;
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  border-radius: 12px;
  overflow: hidden;
}

.codeblock.status-unresolved {
  border-color: rgba(239, 68, 68, 0.65);
}

.code-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 7px 10px;
  background: #141B2E;
  border-bottom: 1px solid var(--code-border);
}

.code-lang {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--code-muted);
}

.code-lang::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #3FB950;
  margin-right: 7px;
}

.codeblock.status-unresolved .code-lang::before {
  background: var(--danger);
}

.codeblock.status-reconstructed .code-lang::before {
  background: var(--accent);
}

.code-meta {
  font-size: 11.5px;
  font-family: var(--font-mono);
  color: var(--code-muted);
  font-variant-numeric: tabular-nums;
}

.code-badge {
  font-size: 10.5px;
  font-weight: 700;
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 2px 9px;
  border-radius: 6px;
}

.code-badge.ok {
  background: rgba(34, 197, 94, 0.14);
  color: var(--accent-bright);
}

.code-badge.warn {
  background: rgba(239, 68, 68, 0.16);
  color: var(--danger-bright);
}

.code-toggle {
  margin-left: auto;
  font-size: 12px;
  font-weight: 600;
  font-family: var(--font-mono);
  color: var(--code-ink);
  background: rgba(51, 65, 85, 0.85);
  border: 1px solid var(--code-border);
  border-radius: 8px;
  padding: 3px 10px;
  cursor: pointer;
  transition: background 0.16s ease, transform 0.16s ease, border-color 0.16s ease;
}

.code-toggle:hover { background: #3D4A61; border-color: var(--accent); }
.code-toggle:active { transform: scale(0.96); }

.codeblock .copy-btn {
  position: static;
  opacity: 0.75;
  margin: 0;
}

.codeblock .copy-btn:hover { opacity: 1; }

.body pre {
  margin: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  padding: 12px 14px;
  overflow-x: auto;
}

.body pre code {
  font-family: var(--font-mono);
  font-size: 12.8px;
  line-height: 1.62;
  background: transparent !important;
  color: var(--code-ink);
  padding: 0;
}

.codeblock.collapsed pre {
  display: none;
}

.code-head {
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
}

.code-head button { cursor: pointer; }

.code-twistie {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--code-muted);
  width: 14px;
  transition: transform 0.16s ease;
}

/* ">" when collapsed, rotated down when expanded. */
.codeblock:not(.collapsed) .code-twistie { transform: rotate(90deg); }

.body pre::-webkit-scrollbar { height: 10px; width: 10px; }
.body pre::-webkit-scrollbar-thumb {
  background: #334155;
  border-radius: 8px;
  border: 2px solid var(--code-bg);
}
.body pre::-webkit-scrollbar-track { background: transparent; }

/* Inline code chips follow the page theme (not the dark blocks). */
.body p code, .body li code, .body td code, .body h1 code,
.body h2 code, .body h3 code, .body h4 code {
  font-family: var(--font-mono);
  font-size: 0.86em;
  background: var(--chip-bg);
  border: 1px solid var(--chip-border);
  padding: 1px 6px;
  border-radius: 6px;
}

.copy-btn {
  font-size: 12px;
  font-weight: 600;
  font-family: var(--font-mono);
  color: var(--code-ink);
  background: rgba(51, 65, 85, 0.85);
  border: 1px solid var(--code-border);
  border-radius: 8px;
  padding: 3px 10px;
  cursor: pointer;
  opacity: 0.55;
  transition: opacity 0.16s ease, background 0.16s ease, transform 0.16s ease;
}

.copy-btn:hover { background: #3D4A61; }
.copy-btn:active { transform: scale(0.96); }

/* Offline fallback block (no marked.js): keep it dark too. */
.body > pre {
  background: var(--code-bg);
  color: var(--code-ink);
}

/* ---------- Empty / drag states ---------- */

.empty {
  max-width: 640px;
  margin: 0 auto;
  padding: 38px 28px;
  color: var(--muted);
  text-align: center;
  border: 2px dashed var(--line);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--card) 70%, transparent);
}

.empty p { margin: 0.4em 0; }
.empty .hint { font-size: 13px; }
.empty code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--chip-bg);
  border: 1px solid var(--chip-border);
  padding: 1px 6px;
  border-radius: 6px;
}

body.dragover { outline: 3px dashed var(--accent); outline-offset: -8px; }
body.dragover .empty { border-color: var(--accent); }

@media (max-width: 960px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar { position: static; }
  .summary { max-height: 32vh; }
}

@media (max-width: 640px) {
  .bar-row { padding: 8px 14px; }
  .brand-name { font-size: 15px; }
  .side-card h1 { font-size: 18px; }
  .layout { padding: 14px 12px 60px; }
  .card { padding: 12px 13px 14px; }
  .file-name { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}

/* ---------- Per-message downloadable files (beside assistant text) ---------- */

.msg-main { min-width: 0; }

.card.assistant.has-files .msg-main {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 252px;
  gap: 16px;
  align-items: start;
}

.files {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(0, 0, 0, 0.25);
  padding: 10px;
  position: sticky;
  top: 76px;
  max-height: 440px;
  overflow-y: auto;
}

.files-title {
  font-size: 11px;
  font-weight: 600;
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 2px 2px 8px;
}

.files ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.file {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 9px;
  padding: 7px 8px;
}

.file-info {
  min-width: 0;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.file-name {
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.file-meta {
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.dl-btn {
  flex: none;
  font-size: 12px;
  font-weight: 600;
  font-family: var(--font-mono);
  padding: 4px 10px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  transition: border-color 0.16s ease, color 0.16s ease;
}

.dl-btn:hover {
  border-color: var(--accent);
  color: var(--accent-bright);
}

@media (max-width: 900px) {
  .card.assistant.has-files .msg-main { grid-template-columns: 1fr; }
  .files { position: static; max-height: none; }
}

/* ---------- Unapplied diffs section ---------- */

#diffSection {
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-width: 0;
}

.view-count {
  display: inline-block;
  min-width: 20px;
  padding: 0 6px;
  margin-left: 6px;
  border-radius: 999px;
  background: rgba(239, 68, 68, 0.16);
  color: var(--danger-bright);
  font-size: 11px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.section-head h2 {
  margin: 0 0 4px;
  font-size: 20px;
  letter-spacing: -0.01em;
  line-height: 1.3;
}

.section-sub {
  margin: 0;
  font-size: 13px;
  color: var(--muted);
}

.card.diff-card {
  border-left: 2px solid var(--danger);
  background: linear-gradient(to bottom, var(--warn-bg) 0, transparent 90px), var(--card);
}

.badge.warn {
  background: var(--warn-bg);
  color: var(--danger-bright);
  border-color: rgba(239, 68, 68, 0.3);
}

.diff-path {
  margin-left: auto;
  font-size: 11.5px;
  font-family: var(--font-mono);
  color: var(--ink);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
}

.diff-reason {
  margin: 0 0 10px;
  font-size: 13px;
  color: var(--muted);
}