:root {
  color-scheme: dark;
  --bg: #0d1117;
  --bg-2: #161b22;
  --bg-3: #21262d;
  --fg: #c9d1d9;
  --fg-muted: #8b949e;
  --accent: #58a6ff;
  --err: #f85149;
  --border: #30363d;
}
* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0; height: 100%;
  background: var(--bg); color: var(--fg);
  font: 14px/1.5 -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo",
        "Pretendard", "Segoe UI", sans-serif;
  word-break: keep-all;
  overscroll-behavior: contain;
}
.hidden { display: none !important; }
.muted { color: var(--fg-muted); font-size: 13px; }
.err { color: var(--err); margin-top: 8px; }
.screen { width: 100%; height: 100%; }

#login {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 12px; padding: 24px; max-width: 360px; margin: 0 auto;
}
#login h1 { margin: 0; font-size: 28px; }
#login input, #login button {
  width: 100%; padding: 12px 14px; border-radius: 8px;
  border: 1px solid var(--border); background: var(--bg-2); color: var(--fg);
  font-size: 16px;
}
button {
  cursor: pointer; background: var(--bg-3); color: var(--fg);
  border: 1px solid var(--border); border-radius: 6px; padding: 6px 10px;
}
button:hover { background: var(--border); }

#app {
  display: grid;
  grid-template-columns: 220px 1fr;
  height: 100vh;
  height: 100dvh;
}
/* Graph and chat panes coexist; the body class flips visibility. */
#graph-sidebar { display: none; }
#graph-main { display: none; }
body.graph-mode #sidebar { display: none; }
body.graph-mode #chat { display: none; }
body.graph-mode #graph-sidebar { display: flex; }
body.graph-mode #graph-main { display: flex; }

#sidebar {
  display: flex; flex-direction: column;
  background: var(--bg-2); border-right: 1px solid var(--border);
  overflow: hidden;
}
#sidebar header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 12px; border-bottom: 1px solid var(--border);
  gap: 6px;
}
#me { font-weight: 600; flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; }
#sidebar header button { padding: 4px 8px; }

.sidebar-section { display: flex; flex-direction: column; min-height: 0; }
.sidebar-section + .sidebar-section { border-top: 1px solid var(--border); }
.sidebar-section-title {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 14px 4px; font-size: 11px; font-weight: 600;
  letter-spacing: 0.04em; text-transform: uppercase; color: var(--fg-muted);
}
.sidebar-section-title button {
  padding: 0 6px; font-size: 14px; line-height: 1;
  background: transparent; border: 1px solid var(--border); border-radius: 4px;
}

#channels, #dms {
  list-style: none; margin: 0; padding: 4px 0 8px;
  overflow-y: auto; flex: 0 1 auto;
}
#channels li, #dms li {
  padding: 6px 14px; cursor: pointer; user-select: none;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  display: flex; align-items: center; gap: 6px;
}
#channels li .ch-label, #dms li .ch-label {
  flex: 1; overflow: hidden; text-overflow: ellipsis;
}
#channels li:hover, #dms li:hover { background: var(--bg-3); }
#channels li.active, #dms li.active {
  background: var(--bg-3); border-left: 3px solid var(--accent); padding-left: 11px;
}
#channels li.unread .ch-label, #dms li.unread .ch-label {
  font-weight: 700; color: var(--fg);
}
#channels li.archived .ch-label, #dms li.archived .ch-label {
  font-style: italic; color: var(--fg-muted);
}
.badge {
  background: var(--accent); color: #0d1117;
  font-size: 10px; font-weight: 700;
  padding: 1px 6px; border-radius: 10px; line-height: 1.4;
}
.toggle {
  display: inline-flex; align-items: center; gap: 4px;
  font-size: 10px; text-transform: none; letter-spacing: 0;
  color: var(--fg-muted); cursor: pointer;
}
.toggle input { margin: 0; }

#dm-picker {
  border: 1px solid var(--border); background: var(--bg-2); color: var(--fg);
  border-radius: 8px; padding: 0; max-width: 360px; width: 90vw;
}
#dm-picker::backdrop { background: rgba(0,0,0,0.5); }
#dm-picker form { padding: 16px; }
#dm-picker h3 { margin: 0 0 12px; }
#dm-picker-list {
  list-style: none; margin: 0 0 12px; padding: 0;
  max-height: 50vh; overflow-y: auto;
}
#dm-picker-list li {
  padding: 8px 12px; cursor: pointer; border-radius: 4px;
}
#dm-picker-list li:hover { background: var(--bg-3); }
#dm-picker-list .empty { color: var(--fg-muted); cursor: default; }
#dm-picker menu { display: flex; justify-content: flex-end; padding: 0; margin: 0; }

#chat { display: flex; flex-direction: column; min-width: 0; }
#chat-header {
  padding: 12px 16px; border-bottom: 1px solid var(--border);
  font-weight: 600; display: flex; align-items: center; gap: 10px;
}
#chat-header .back {
  display: none;
  background: transparent; border: none; color: var(--fg);
  font-size: 20px; line-height: 1; padding: 4px 8px; margin-left: -4px;
  cursor: pointer;
}
#chat-header .back:hover { background: var(--bg-3); }
/* Mobile layout. Must follow the default #sidebar/#chat rules above so the
   responsive `display` override actually wins the cascade (equal specificity,
   later-rule-wins). */
@media (max-width: 640px) {
  #app { grid-template-columns: 1fr; }
  #sidebar { display: flex; }
  #chat { display: none; }
  body.in-chat #sidebar { display: none; }
  body.in-chat #chat { display: flex; }
  #chat-header .back { display: inline-block; }

  /* Graph mode mobile: sidebar by default, main when discussion/list selected.
     `body.in-graph` mirrors `body.in-chat` for the graph pane. */
  body.graph-mode #graph-sidebar { display: flex; }
  body.graph-mode #graph-main { display: none; }
  body.graph-mode.in-graph #graph-sidebar { display: none; }
  body.graph-mode.in-graph #graph-main { display: flex; }
}

#messages {
  flex: 1; overflow-y: auto; padding: 12px 16px;
  display: flex; flex-direction: column; gap: 8px;
}
.msg { padding: 8px 10px; border-radius: 6px; background: var(--bg-2); }
.msg .meta { font-size: 12px; color: var(--fg-muted); margin-bottom: 2px; }
.msg .body { white-space: pre-wrap; }
.msg.self { background: #1f2937; }

#composer {
  display: flex; gap: 8px; padding: 10px 12px;
  border-top: 1px solid var(--border);
  padding-bottom: max(10px, env(safe-area-inset-bottom));
}
#composer textarea {
  flex: 1; resize: none; min-height: 36px; padding: 8px 10px;
  background: var(--bg-2); color: var(--fg);
  border: 1px solid var(--border); border-radius: 6px;
  font: inherit;
}
#composer button { padding: 8px 14px; }

/* ─── graph view ─────────────────────────────────────────────────────────── */

#graph-sidebar {
  flex-direction: column;
  background: var(--bg-2); border-right: 1px solid var(--border);
  overflow: hidden;
}
#graph-sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: 8px 0;
}
.graph-section-header {
  padding: 12px 16px 4px;
  font-size: 11px; font-weight: 600; letter-spacing: 0.04em;
  text-transform: uppercase; color: var(--fg-muted);
}
.graph-empty { padding: 4px 16px; color: var(--fg-muted); font-size: 12px; }
.graph-kind-group { margin-top: 4px; }
.graph-kind-label {
  padding: 2px 16px; font-size: 10px; color: var(--fg-muted);
  text-transform: uppercase; letter-spacing: 0.04em;
}
.graph-row {
  width: 100%; text-align: left;
  background: transparent; border: none; color: var(--fg);
  padding: 4px 16px; cursor: pointer;
  display: flex; align-items: center; gap: 8px;
  font: inherit; border-radius: 0;
}
.graph-row:hover { background: rgba(255,255,255,0.05); }
.graph-row.active { background: rgba(255,255,255,0.1); }
.graph-row-label {
  flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.graph-row-extra {
  font-size: 10px; color: var(--fg-muted);
}

#graph-main {
  flex-direction: column;
  min-width: 0;
  overflow: hidden;
}
.graph-placeholder, .graph-loading, .graph-error {
  padding: 16px; color: var(--fg-muted); font-size: 13px;
}
.graph-error { color: var(--err); }

.graph-page-header {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
}
.graph-page-header-row {
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
}
.graph-page-header h1 {
  margin: 0; font-size: 17px; font-weight: 600;
}
.graph-page-topic {
  margin: 4px 0 0; color: var(--fg-muted); font-size: 12px;
}
.graph-pill {
  padding: 1px 6px; border-radius: 4px;
  background: var(--bg-3); color: var(--fg-muted);
  font-size: 11px;
}
.graph-pill-kind { background: var(--bg-3); color: var(--fg-muted); }
.graph-pill-ext {
  background: rgba(88,166,255,0.1);
  border: 1px solid rgba(88,166,255,0.2);
  color: var(--accent);
}
.graph-pill-tag {
  background: rgba(88,166,255,0.1);
  border: 1px solid rgba(88,166,255,0.2);
  color: var(--accent);
}
.graph-pill.status-resolved {
  background: rgba(16,185,129,0.1); color: #6ee7b7;
}
.graph-pill.status-abandoned {
  background: rgba(107,114,128,0.1); color: var(--fg-muted);
}
.graph-pill.status-resolving {
  background: rgba(245,158,11,0.1); color: #fcd34d;
}
.graph-pill.status-open, .graph-pill.status-active {
  background: rgba(59,130,246,0.1); color: #93c5fd;
}

.graph-list {
  flex: 1;
  overflow-y: auto;
  padding: 12px;
  display: flex; flex-direction: column; gap: 8px;
}
.graph-list-empty {
  color: var(--fg-muted); font-size: 12px; padding: 4px;
}
.graph-card {
  width: 100%; text-align: left;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  cursor: pointer;
  display: flex; flex-direction: column; gap: 4px;
  font: inherit; color: var(--fg);
  transition: border-color 0.15s ease;
}
.graph-card:hover {
  border-color: rgba(88,166,255,0.4);
  background: var(--bg-2);
}
.graph-card-head {
  display: flex; align-items: baseline; gap: 8px;
}
.graph-card-type { color: var(--fg-muted); font-size: 11px; }
.graph-card-title {
  flex: 1; min-width: 0;
  font-size: 14px; font-weight: 500;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  color: var(--fg);
}
.graph-card-utts {
  color: var(--fg-muted); font-size: 11px; flex-shrink: 0;
}
.graph-card-meta {
  font-size: 11px; color: var(--fg-muted);
  display: flex; gap: 6px;
}

/* DiscussionView */
.graph-discussion-header {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  display: flex; align-items: flex-start; gap: 10px;
}
.graph-back-btn {
  background: transparent; border: none; color: var(--fg);
  font-size: 20px; line-height: 1; padding: 4px 8px;
  cursor: pointer;
  flex-shrink: 0;
}
.graph-back-btn:hover { background: var(--bg-3); }
.graph-discussion-title-wrap { flex: 1; min-width: 0; }
.graph-discussion-title-wrap h2 {
  margin: 0; font-size: 16px; font-weight: 600;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.graph-discussion-sub {
  margin-top: 4px;
  display: flex; flex-wrap: wrap; align-items: center; gap: 6px;
  font-size: 11px; color: var(--fg-muted);
}
.graph-discussion-by { color: var(--fg-muted); }
.graph-resolve-btn {
  flex-shrink: 0;
  padding: 6px 12px;
  background: rgba(88,166,255,0.8); color: #000;
  border: none; border-radius: 6px;
  font-size: 12px; font-weight: 500;
  cursor: pointer;
}
.graph-resolve-btn:hover:not(:disabled) { background: var(--accent); }
.graph-resolve-btn:disabled { opacity: 0.5; cursor: not-allowed; }
.graph-discussion-tags {
  padding: 8px 16px;
  display: flex; flex-wrap: wrap; gap: 4px;
  border-bottom: 1px solid var(--border);
}
.graph-utterance-list {
  flex: 1;
  list-style: none; margin: 0; padding: 12px 16px;
  overflow-y: auto;
  display: flex; flex-direction: column; gap: 12px;
}
.graph-utterance {
  display: flex; gap: 12px; font-size: 14px;
}
.graph-utterance-author {
  flex-shrink: 0; width: 64px;
  color: var(--fg-muted); font-size: 12px; padding-top: 2px;
}
.graph-utterance-body {
  flex: 1;
  white-space: pre-wrap;
  color: var(--fg);
}
.graph-utterance-empty {
  color: var(--fg-muted); font-size: 12px;
}
.graph-summary {
  padding: 12px 16px;
  border-top: 1px solid rgba(88,166,255,0.2);
  background: rgba(88,166,255,0.05);
}
.graph-summary-head {
  display: flex; align-items: center; gap: 8px;
  font-size: 11px; color: var(--accent);
  text-transform: uppercase; letter-spacing: 0.04em;
}
.graph-summary-ai { color: var(--fg-muted); text-transform: lowercase; }
.graph-summary-by { margin-left: auto; color: var(--fg-muted); text-transform: none; }
.graph-summary-body {
  margin: 6px 0 0; white-space: pre-wrap;
  color: var(--fg); font-size: 14px;
}
.graph-utterance-composer {
  display: flex; gap: 8px;
  padding: 10px 16px;
  border-top: 1px solid var(--border);
  padding-bottom: max(10px, env(safe-area-inset-bottom));
}
.graph-utterance-composer textarea {
  flex: 1; resize: none; min-height: 36px; padding: 8px 10px;
  background: var(--bg-2); color: var(--fg);
  border: 1px solid var(--border); border-radius: 6px;
  font: inherit;
}
.graph-utterance-composer button { padding: 8px 14px; }

/* Resolve modal */
#resolve-modal {
  border: 1px solid var(--border); background: var(--bg-2); color: var(--fg);
  border-radius: 8px; padding: 0; max-width: 600px; width: 90vw;
  max-height: 90vh;
}
#resolve-modal::backdrop { background: rgba(0,0,0,0.6); }
.resolve-modal-form { padding: 0; margin: 0; }
.resolve-modal-header {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between;
}
.resolve-modal-header h3 { margin: 0; font-size: 14px; }
.resolve-modal-header button {
  background: transparent; border: none; color: var(--fg-muted);
  font-size: 16px; padding: 0; cursor: pointer;
}
.resolve-modal-body {
  padding: 12px 16px;
  display: flex; flex-direction: column; gap: 12px;
  overflow-y: auto; max-height: calc(90vh - 120px);
}
.resolve-field { display: flex; flex-direction: column; gap: 4px; }
.resolve-field > span, .resolve-field > legend {
  color: var(--fg-muted); font-size: 11px;
}
.resolve-field select, .resolve-field textarea {
  background: var(--bg); color: var(--fg);
  border: 1px solid var(--border); border-radius: 6px;
  padding: 6px 10px;
  font: inherit;
}
.resolve-field textarea { resize: vertical; }
.resolve-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.graph-tag-toggle {
  padding: 4px 10px; font-size: 12px;
  background: transparent; color: var(--fg-muted);
  border: 1px solid var(--border); border-radius: 6px; cursor: pointer;
}
.graph-tag-toggle.on {
  background: rgba(88,166,255,0.15);
  border-color: rgba(88,166,255,0.4);
  color: var(--accent);
}
.resolve-modal-actions {
  padding: 12px 16px; margin: 0;
  border-top: 1px solid var(--border);
  display: flex; justify-content: flex-end; gap: 8px;
}
#resolve-confirm {
  background: rgba(88,166,255,0.8); color: #000;
  border: none; padding: 6px 14px; border-radius: 6px;
  font-weight: 500; cursor: pointer;
}
#resolve-confirm:hover:not(:disabled) { background: var(--accent); }
#resolve-confirm:disabled { opacity: 0.5; cursor: not-allowed; }