:root {
  color-scheme: light;
  --bg: #f6f5ef;
  --bg-elev: #ffffff;
  --bg-soft: #fbf9f1;
  --border: #e6e1d2;
  --border-strong: #cfc6ad;
  --text: #1f1d18;
  --text-soft: #5d574a;
  --text-muted: #8a8474;
  --accent: #c0533d;
  --accent-soft: #f1d4c8;
  --accent-ink: #7a2e1c;
  --highlight: #f3e4a8;
  --positive: #4d7a3f;
  --warn: #b27822;
  --danger: #a8392f;
  --radius: 10px;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Source Han Sans CN",
    "Noto Sans CJK SC", "Hiragino Sans GB", "WenQuanYi Micro Hei", Inter, Helvetica, Arial, sans-serif;
  font-size: 14px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
}

body {
  display: flex;
  flex-direction: column;
}

button {
  font: inherit;
  cursor: pointer;
}

textarea, input, select {
  font: inherit;
  color: inherit;
}

.top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  background: var(--bg-elev);
  border-bottom: 1px solid var(--border);
  flex: 0 0 auto;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  font-size: 18px;
}

.brand-text strong {
  display: block;
  font-size: 15px;
  letter-spacing: 0.04em;
}

.brand-text small {
  color: var(--text-muted);
  font-size: 11px;
  letter-spacing: 0.04em;
}

.top-actions {
  display: flex;
  gap: 8px;
}

.primary-btn {
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #fff;
  border-radius: 6px;
  padding: 7px 16px;
  font-size: 13px;
  letter-spacing: 0.04em;
}

.primary-btn:hover { filter: brightness(0.95); }
.primary-btn:disabled { opacity: 0.55; cursor: not-allowed; }

.ghost-btn {
  border: 1px solid var(--border-strong);
  background: var(--bg-elev);
  color: var(--text);
  border-radius: 6px;
  padding: 6px 14px;
  font-size: 13px;
}

.ghost-btn:hover { background: var(--bg-soft); }
.ghost-btn.small { padding: 4px 10px; font-size: 12px; }
.ghost-btn.danger { color: var(--danger); border-color: rgba(168, 57, 47, 0.4); }

.text-btn {
  background: transparent;
  border: none;
  color: var(--accent-ink);
  padding: 2px 0;
  font-size: 12px;
  letter-spacing: 0.04em;
}

.text-btn:hover { text-decoration: underline; }

.icon-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 16px;
  width: 28px;
  height: 28px;
  border-radius: 6px;
}

.icon-btn:hover {
  background: var(--bg-soft);
  color: var(--text);
}

/* layout */
.layout {
  flex: 1 1 auto;
  display: grid;
  grid-template-columns: 260px 1fr 320px;
  min-height: 0;
}

.left-pane, .right-pane {
  border-right: 1px solid var(--border);
  background: var(--bg-soft);
  overflow-y: auto;
  padding: 14px 12px;
}

.right-pane {
  border-right: none;
  border-left: 1px solid var(--border);
}

.center-pane {
  display: flex;
  flex-direction: column;
  min-height: 0;
  background: var(--bg);
}

.pane-section { margin-bottom: 18px; }

.pane-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.pane-head h3 {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--text-soft);
  font-weight: 600;
}

.pane-head small {
  color: var(--text-muted);
  font-size: 11px;
}

.empty-strip {
  padding: 10px 12px;
  font-size: 12px;
  color: var(--text-muted);
  background: var(--bg-elev);
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius);
  text-align: center;
}

/* conversation list */
.conv-list { display: flex; flex-direction: column; gap: 4px; }

.conv-item {
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px solid transparent;
  background: var(--bg-elev);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.conv-item:hover { border-color: var(--border-strong); }
.conv-item.active { background: var(--accent-soft); border-color: var(--accent); }

.conv-item strong {
  font-size: 13px;
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.conv-item small {
  color: var(--text-muted);
  font-size: 11px;
  display: flex;
  justify-content: space-between;
}

/* templates */
.tab-row {
  display: flex;
  gap: 4px;
  margin-bottom: 8px;
  flex-wrap: wrap;
}

.tab-btn {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-soft);
  padding: 3px 8px;
  font-size: 11px;
  border-radius: 12px;
  cursor: pointer;
}

.tab-btn:hover { background: var(--bg-elev); }
.tab-btn.active { background: var(--accent); color: #fff; border-color: var(--accent); }

.template-list, .data-pool, .draft-list, .resonance-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.template-card {
  padding: 8px 10px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.template-card:hover { border-color: var(--border-strong); background: #fff; }

.template-card-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 6px;
}

.template-card strong {
  font-size: 12.5px;
  color: var(--text);
  flex: 1 1 auto;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.template-kind-tag {
  display: inline-block;
  padding: 1px 6px;
  border-radius: 8px;
  background: var(--accent-soft);
  color: var(--accent-ink);
  font-size: 10px;
  letter-spacing: 0.04em;
}

.template-card span {
  font-size: 11px;
  color: var(--text-muted);
  line-height: 1.5;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.template-actions {
  display: flex;
  gap: 6px;
  margin-top: 4px;
}

.template-actions .text-btn { font-size: 11px; }

/* data pool */
.data-pool-item {
  padding: 8px 10px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.data-pool-item strong {
  font-size: 12px;
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.data-pool-item small {
  display: block;
  color: var(--text-muted);
  font-size: 10.5px;
  margin-bottom: 2px;
}

.data-pool-item p {
  margin: 4px 0 0;
  font-size: 11.5px;
  color: var(--text-soft);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.data-pool-item .row-actions {
  margin-top: 6px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 6px;
}

/* center conversation */
.conv-header {
  padding: 16px 24px 8px;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-elev);
}

.conv-title-wrap h2 {
  margin: 0;
  font-size: 18px;
  letter-spacing: 0.04em;
}

.conv-title-wrap p {
  margin: 4px 0 0;
  color: var(--text-muted);
  font-size: 12px;
}

.conv-actions {
  display: flex;
  gap: 6px;
}

.applied-template {
  padding: 8px 24px;
  background: var(--highlight);
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--text);
}

.applied-template strong {
  margin-left: 6px;
}

.applied-template small {
  color: var(--text-muted);
}

.message-list {
  flex: 1 1 auto;
  overflow-y: auto;
  padding: 18px 24px 8px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.welcome-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px 22px;
  color: var(--text-soft);
  line-height: 1.7;
}

.welcome-card h4 {
  margin: 0 0 8px;
  color: var(--text);
  font-size: 14px;
}

.welcome-card ol {
  margin: 6px 0 0;
  padding-left: 20px;
  font-size: 13px;
}

.welcome-card .quick-row {
  margin-top: 12px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.quick-chip {
  padding: 6px 12px;
  border-radius: 14px;
  border: 1px solid var(--border-strong);
  background: var(--bg-soft);
  font-size: 12px;
  cursor: pointer;
  color: var(--text);
}

.quick-chip:hover { background: var(--accent-soft); border-color: var(--accent); }

.msg {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  max-width: 92%;
}

.msg.user { flex-direction: row-reverse; align-self: flex-end; }

.msg-avatar {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  display: grid;
  place-items: center;
  font-size: 12px;
  color: var(--text-soft);
  flex: 0 0 30px;
  font-weight: 600;
}

.msg.user .msg-avatar { background: var(--accent); color: #fff; border-color: var(--accent); }

.msg-body {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  padding: 12px 14px;
  border-radius: 12px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--text);
  white-space: pre-wrap;
  word-break: break-word;
}

.msg.user .msg-body {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.msg.assistant .msg-body strong { font-weight: 600; }
.msg.assistant .msg-body code {
  background: var(--bg-soft);
  padding: 1px 5px;
  border-radius: 3px;
  font-size: 12.5px;
}

.msg-meta {
  display: flex;
  gap: 6px;
  margin-top: 6px;
  font-size: 11px;
  color: var(--text-muted);
}

.msg-meta button {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 11px;
  cursor: pointer;
  padding: 0;
}

.msg-meta button:hover { color: var(--accent-ink); text-decoration: underline; }

.steps-line {
  margin-top: 8px;
  font-size: 11px;
  color: var(--text-muted);
}

.steps-line .step-chip {
  display: inline-block;
  margin-right: 6px;
  margin-bottom: 4px;
  padding: 2px 7px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg-soft);
}

.intents-line {
  margin-top: 8px;
  font-size: 11px;
}

.intent-pill {
  display: inline-block;
  padding: 2px 8px;
  background: var(--accent-soft);
  color: var(--accent-ink);
  border-radius: 10px;
  margin-right: 6px;
  margin-bottom: 4px;
  font-size: 11px;
}

.intent-pill.error { background: #fad9d4; color: var(--danger); }

.streaming-cursor::after {
  content: '▍';
  color: var(--accent);
  animation: blink 1s steps(1) infinite;
  margin-left: 1px;
}

@keyframes blink { 50% { opacity: 0; } }

.composer {
  border-top: 1px solid var(--border);
  background: var(--bg-elev);
  padding: 12px 20px;
}

.composer textarea {
  width: 100%;
  resize: vertical;
  min-height: 60px;
  max-height: 240px;
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  padding: 10px 12px;
  background: var(--bg);
  outline: none;
}

.composer textarea:focus { border-color: var(--accent); }

.composer-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 8px;
  gap: 12px;
}

.composer-buttons {
  display: flex;
  gap: 8px;
}

.composer-status {
  font-size: 11px;
  color: var(--text-muted);
}

.composer-status.busy {
  color: var(--warn);
}

.composer-status.done { color: var(--positive); }

/* right pane */
.resonance-item {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 12.5px;
  color: var(--text);
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 6px;
  line-height: 1.5;
}

.resonance-item small {
  color: var(--text-muted);
  font-size: 10.5px;
  display: block;
  margin-top: 2px;
}

.generate-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
}

.generate-btn {
  background: var(--bg-elev);
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  padding: 8px 10px;
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.generate-btn b {
  font-size: 13px;
  color: var(--text);
}

.generate-btn span {
  font-size: 10.5px;
  color: var(--text-muted);
}

.generate-btn:hover { border-color: var(--accent); background: var(--accent-soft); }
.generate-btn:disabled { opacity: 0.55; cursor: not-allowed; }

.generate-status {
  margin-top: 6px;
  font-size: 11px;
  color: var(--text-muted);
  min-height: 14px;
}

.draft-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 10px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.draft-card:hover { border-color: var(--border-strong); }

.draft-card-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.draft-card-head strong {
  font-size: 12.5px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.draft-tag {
  font-size: 10px;
  background: var(--accent-soft);
  color: var(--accent-ink);
  padding: 1px 6px;
  border-radius: 8px;
}

.draft-card p {
  margin: 0;
  font-size: 11.5px;
  color: var(--text-soft);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.draft-card small { color: var(--text-muted); font-size: 10.5px; }

/* modal */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(31, 29, 24, 0.45);
  display: grid;
  place-items: center;
  z-index: 30;
  padding: 24px;
}

.modal.hidden { display: none; }

.modal-card {
  background: var(--bg-elev);
  border-radius: 14px;
  width: min(560px, 100%);
  max-height: 86vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.18);
}

.modal-card.wide { width: min(780px, 100%); }

.modal-head {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-head h3 { margin: 0; font-size: 15px; }
.modal-head-actions { display: flex; gap: 6px; align-items: center; }

.modal-body {
  padding: 16px 18px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.modal-foot {
  padding: 12px 18px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}

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

.field > span {
  font-size: 11.5px;
  color: var(--text-soft);
  letter-spacing: 0.04em;
}

.field input, .field textarea, .field select {
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  background: var(--bg);
  padding: 8px 10px;
  outline: none;
  font: inherit;
  color: var(--text);
}

.field input:focus, .field textarea:focus, .field select:focus {
  border-color: var(--accent);
}

.field textarea { resize: vertical; min-height: 50px; }

.row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.muted { color: var(--text-muted); }
.small { font-size: 11.5px; }

/* toast */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  padding: 9px 18px;
  background: var(--text);
  color: #fff;
  font-size: 12px;
  border-radius: 8px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s;
  z-index: 40;
}

.toast.show { opacity: 0.95; }
.toast[data-tone="error"] { background: var(--danger); }
.toast[data-tone="warn"] { background: var(--warn); }
.toast[data-tone="ok"] { background: var(--positive); }

/* hidden */
.hidden { display: none !important; }

/* scrollbars */
.message-list::-webkit-scrollbar,
.left-pane::-webkit-scrollbar,
.right-pane::-webkit-scrollbar { width: 6px; }

.message-list::-webkit-scrollbar-thumb,
.left-pane::-webkit-scrollbar-thumb,
.right-pane::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: 3px;
}

/* responsive */
@media (max-width: 1100px) {
  .layout { grid-template-columns: 220px 1fr 260px; }
}

@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .left-pane, .right-pane { display: none; }
}