/* Alex — Perplexity-style layout, Tavily-inspired look (warm cream paper, warm
   ink, electric-blue accent, 10/15px radii and pills). Light "paper" theme, pinned regardless of the OS setting so the demo looks
   the same on any machine. All colour lives in the tokens below. */

:root {
  --paper: #fefcf5;
  --surface: #fffdf9;
  --surface-2: #f8f4ec;
  --surface-3: #f1ede4;
  --border: #eae6dc;
  --border-strong: #d8d3c7;
  --text: #3c3a39;
  --text-strong: #0b0907;
  --muted: #6f6b66;
  --muted-2: #9b968e;
  --accent: #2677ff;
  --accent-hover: #1f63d6;
  --accent-soft: rgba(38, 119, 255, 0.10);
  --accent-line: rgba(38, 119, 255, 0.32);
  --warn: #b5510a;
  --warn-soft: rgba(255, 115, 0, 0.12);
  --ok: #4f8f6f;
  --ok-soft: rgba(129, 176, 154, 0.18);
  --radius: 10px;
  --radius-lg: 15px;
  --radius-pill: 999px;
  --shadow-sm: 0 1px 2px rgba(11, 9, 7, 0.05);
  --shadow-md: 0 4px 16px rgba(11, 9, 7, 0.07);
  --shadow-lg: 0 24px 60px rgba(11, 9, 7, 0.14);
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  color-scheme: light;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
  margin: 0;
}

body {
  background: var(--paper);
  color: var(--text);
  font-family: "Suisse Intl", "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

.icon-sm {
  width: 15px;
  height: 15px;
  flex: 0 0 auto;
}

/* ---------------------------------------------------------------- header */

.app-header {
  border-bottom: 1px solid var(--border);
  background: var(--paper);
  padding: 14px 24px;
  flex: 0 0 auto;
}

.header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.header-title {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.app-icon {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  background: var(--accent-soft);
  color: var(--accent);
  flex: 0 0 auto;
}

.app-icon svg {
  width: 19px;
  height: 19px;
}

.app-header h1 {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.015em;
  color: var(--text-strong);
}

.subtitle {
  margin: 1px 0 0;
  font-size: 12px;
  color: var(--muted-2);
  font-variant-numeric: tabular-nums;
}

.current-level-badge {
  font-size: 12px;
  font-weight: 550;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid var(--accent-line);
  padding: 5px 12px;
  border-radius: var(--radius-pill);
  white-space: nowrap;
  flex: 0 0 auto;
}

/* ---------------------------------------------------------------- layout */

.layout {
  flex: 1 1 auto;
  display: grid;
  grid-template-columns: 264px minmax(0, 1fr);
  min-height: 0;
}

.sidebar {
  border-right: 1px solid var(--border);
  padding: 20px;
  overflow-y: auto;
  background: var(--surface-2);
}

.sidebar h2 {
  display: flex;
  align-items: center;
  gap: 7px;
  margin: 0 0 10px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted-2);
}

.select-wrapper {
  position: relative;
}

.level-select {
  width: 100%;
  appearance: none;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font: inherit;
  font-size: 13.5px;
  font-weight: 500;
  padding: 10px 34px 10px 12px;
  cursor: pointer;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.level-select:hover {
  border-color: var(--border-strong);
}

.level-select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.select-chevron {
  position: absolute;
  right: 11px;
  top: 50%;
  transform: translateY(-50%);
  width: 15px;
  height: 15px;
  color: var(--muted-2);
  pointer-events: none;
}

.level-select-desc {
  margin: 10px 0 18px;
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--muted);
}

.secondary-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font: inherit;
  font-size: 13px;
  font-weight: 500;
  padding: 9px 12px;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}

.secondary-btn:hover {
  background: var(--surface-3);
  border-color: var(--border-strong);
}

.kb-panel {
  margin-top: 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--surface);
}

.kb-toggle {
  display: flex;
  align-items: center;
  gap: 7px;
  width: 100%;
  background: transparent;
  border: none;
  color: var(--muted);
  font: inherit;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  text-align: left;
  padding: 9px 11px;
  cursor: pointer;
  transition: background 0.15s;
}

.kb-toggle:hover {
  background: var(--surface-2);
}

.kb-toggle svg:first-child {
  color: var(--accent);
  flex: 0 0 auto;
}

.kb-toggle #kb-summary {
  flex: 1 1 auto;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.kb-chevron {
  width: 14px;
  height: 14px;
  flex: 0 0 auto;
  transition: transform 0.15s;
}

.kb-panel.collapsed .kb-chevron {
  transform: rotate(-90deg);
}

.kb-list {
  border-top: 1px solid var(--border);
  padding: 7px;
}

.kb-item {
  padding: 6px 7px;
  border-radius: 7px;
}

.kb-item:hover {
  background: var(--surface-2);
}

.kb-item-name {
  font-size: 12px;
  line-height: 1.35;
  color: var(--text);
  font-weight: 500;
}

.kb-item-meta {
  font-size: 10.5px;
  color: var(--muted-2);
  font-variant-numeric: tabular-nums;
  margin-top: 1px;
}

.kb-total {
  margin-top: 5px;
  padding: 7px 7px 3px;
  border-top: 1px solid var(--border);
  font-size: 10.5px;
  color: var(--muted-2);
  font-variant-numeric: tabular-nums;
}

.kb-empty {
  font-size: 11.5px;
  color: var(--muted-2);
  padding: 5px 7px;
}

.debug-toggle {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.debug-toggle label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12.5px;
  color: var(--muted);
  cursor: pointer;
  user-select: none;
}

.debug-toggle input[type="checkbox"] {
  accent-color: var(--accent);
  width: 15px;
  height: 15px;
  cursor: pointer;
  flex: 0 0 auto;
}

/* ------------------------------------------------------------- chat area */

.chat-area {
  display: flex;
  flex-direction: column;
  min-height: 0;
  min-width: 0;
}

.banner-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 24px;
  border-bottom: 1px solid var(--border);
}

.current-level-banner {
  flex: 1 1 auto;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--muted);
  min-width: 0;
}

.current-level-banner strong {
  color: var(--text-strong);
  font-weight: 600;
}

.how-it-works-btn {
  display: flex;
  align-items: center;
  gap: 7px;
  flex: 0 0 auto;
  background: transparent;
  border: 1px solid var(--accent-line);
  border-radius: var(--radius-pill);
  color: var(--accent);
  font: inherit;
  font-size: 12.5px;
  font-weight: 550;
  padding: 7px 14px;
  cursor: pointer;
  transition: background 0.15s;
}

.how-it-works-btn:hover {
  background: var(--accent-soft);
}

.how-it-works-btn svg {
  width: 14px;
  height: 14px;
}

.chat-window {
  flex: 1 1 auto;
  overflow-y: auto;
  padding: 28px 24px 8px;
  scroll-behavior: smooth;
}

/* Perplexity keeps the answer column narrow and centred. */
.msg-row,
.typing-indicator,
.tool-indicator,
.msg.system-note {
  max-width: 760px;
  margin-left: auto;
  margin-right: auto;
}

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  height: 100%;
  color: var(--muted-2);
}

.empty-state-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  background: var(--accent-soft);
  color: var(--accent);
}

.empty-state-icon svg {
  width: 26px;
  height: 26px;
}

.empty-state p {
  margin: 0;
  font-size: 14px;
}

/* --------------------------------------------------------- message rows */

.msg-row {
  display: flex;
  gap: 12px;
  margin-bottom: 26px;
}

.msg-col {
  min-width: 0;
  flex: 1 1 auto;
}

.avatar {
  width: 27px;
  height: 27px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  margin-top: 2px;
}

.avatar svg {
  width: 15px;
  height: 15px;
}

.avatar.user {
  background: var(--surface-3);
  color: var(--muted);
}

.avatar.assistant {
  background: var(--accent-soft);
  color: var(--accent);
}

/* The query reads as a headline, not a bubble — the Perplexity signature. */
.msg-row.user {
  margin-bottom: 18px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.msg-row.user .avatar {
  display: none;
}

.msg.user {
  font-size: 22px;
  line-height: 1.35;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text-strong);
}

.msg-row.assistant .msg-col::before {
  content: "Answer";
  display: block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--muted-2);
  margin-bottom: 8px;
}

.msg.assistant {
  font-size: 15px;
  line-height: 1.68;
  color: var(--text);
}

/* ----------------------------------------------- rendered markdown body */

.msg.assistant > *:first-child {
  margin-top: 0;
}

.msg.assistant > *:last-child {
  margin-bottom: 0;
}

.msg.assistant p {
  margin: 0 0 13px;
}

.msg.assistant h3,
.msg.assistant h4,
.msg.assistant h5,
.msg.assistant h6 {
  margin: 22px 0 9px;
  line-height: 1.3;
  letter-spacing: -0.015em;
  color: var(--text-strong);
  font-weight: 600;
}

.msg.assistant h3 {
  font-size: 17px;
}

.msg.assistant h4 {
  font-size: 15.5px;
}

.msg.assistant h5,
.msg.assistant h6 {
  font-size: 14px;
}

.msg.assistant ul,
.msg.assistant ol {
  margin: 0 0 13px;
  padding-left: 22px;
}

.msg.assistant li {
  margin-bottom: 6px;
}

.msg.assistant li::marker {
  color: var(--muted-2);
}

.msg.assistant strong {
  font-weight: 600;
  color: var(--text-strong);
}

.msg.assistant a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid var(--accent-line);
}

.msg.assistant a:hover {
  border-bottom-color: var(--accent);
}

.msg.assistant code {
  font-family: var(--mono);
  font-size: 0.86em;
  background: var(--surface-3);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 1px 5px;
}

.msg.assistant pre.md-code {
  margin: 0 0 14px;
  padding: 13px 15px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow-x: auto;
}

.msg.assistant pre.md-code code {
  background: none;
  border: none;
  padding: 0;
  font-size: 12.5px;
  line-height: 1.6;
}

.msg.assistant blockquote {
  margin: 0 0 14px;
  padding: 2px 0 2px 14px;
  border-left: 2px solid var(--accent-line);
  color: var(--muted);
}

.msg.assistant hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 18px 0;
}

.msg.assistant del {
  color: var(--muted-2);
}

/* Blinking caret while tokens are still arriving. */
.msg.assistant.streaming > *:last-child::after {
  content: "";
  display: inline-block;
  width: 2px;
  height: 1.02em;
  margin-left: 2px;
  vertical-align: text-bottom;
  background: var(--accent);
  animation: caret 1s steps(2, start) infinite;
}

@keyframes caret {
  to {
    visibility: hidden;
  }
}

.msg.system-note {
  font-size: 12.5px;
  color: var(--warn);
  background: var(--warn-soft);
  border: 1px solid transparent;
  border-radius: var(--radius);
  padding: 9px 13px;
  margin-bottom: 22px;
}

/* -------------------------------------------------- tool / status pills */

.tool-indicator {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 12.5px;
  color: var(--muted);
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-left: 2px solid var(--border-strong);
  border-radius: 10px;
  padding: 8px 13px;
  margin-bottom: 18px;
}

.tool-indicator svg {
  width: 14px;
  height: 14px;
  color: var(--muted-2);
  flex: 0 0 auto;
}

.tool-indicator.ok {
  border-left-color: var(--ok);
  background: var(--ok-soft);
  color: var(--ok);
}

.tool-indicator.ok svg {
  color: var(--ok);
}

.tool-indicator.warn {
  border-left-color: var(--warn);
  background: var(--warn-soft);
  color: var(--warn);
}

.tool-indicator.warn svg {
  color: var(--warn);
}

.typing-indicator {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 22px;
}

.typing-dots {
  display: flex;
  gap: 4px;
  padding: 9px 0;
}

.typing-dots span {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  opacity: 0.35;
  animation: bounce 1.3s infinite;
}

.typing-dots span:nth-child(2) {
  animation-delay: 0.16s;
}

.typing-dots span:nth-child(3) {
  animation-delay: 0.32s;
}

@keyframes bounce {
  0%, 60%, 100% {
    transform: translateY(0);
    opacity: 0.35;
  }
  30% {
    transform: translateY(-4px);
    opacity: 1;
  }
}

/* ---------------------------------------------------------- sources rail */

.sources-panel {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
}

.sources-panel-header {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted-2);
  margin-bottom: 10px;
}

.sources-panel-header svg {
  width: 13px;
  height: 13px;
  color: var(--accent);
  flex: 0 0 auto;
}

.sources-list {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(216px, 1fr);
  gap: 10px;
  overflow-x: auto;
  padding-bottom: 6px;
}

.source-card {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 11px 12px;
  transition: border-color 0.15s, background 0.15s;
}

.source-card:hover {
  border-color: var(--accent-line);
  background: var(--surface);
}

.source-card-meta {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  color: var(--muted-2);
  margin-bottom: 7px;
  font-variant-numeric: tabular-nums;
}

.source-number {
  display: grid;
  place-items: center;
  width: 17px;
  height: 17px;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 10.5px;
  font-weight: 650;
  flex: 0 0 auto;
}

.source-doc {
  font-weight: 600;
  color: var(--text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
}

.source-loc {
  flex: 0 0 auto;
  color: var(--muted-2);
}

.source-card-text {
  font-size: 12px;
  line-height: 1.5;
  color: var(--muted);
  display: -webkit-box;
  -webkit-line-clamp: 4;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.source-card-flash {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.citation-badge {
  display: inline-grid;
  place-items: center;
  min-width: 16px;
  height: 16px;
  padding: 0 4px;
  margin: 0 1px 0 2px;
  border: none;
  border-radius: 4px;
  background: var(--accent-soft);
  color: var(--accent);
  font: inherit;
  font-size: 10.5px;
  font-weight: 650;
  line-height: 1;
  vertical-align: 1px;
  cursor: pointer;
  transition: background 0.15s;
}

button.citation-badge:hover {
  background: var(--accent);
  color: var(--paper);
}

/* ----------------------------------------------------------- input row */

.chat-input-row {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 8px;
  max-width: 760px;
  width: 100%;
  margin: 0 auto;
  padding: 14px 24px 22px;
}

#chat-input {
  flex: 1 1 auto;
  min-width: 0;
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-pill);
  color: var(--text);
  font: inherit;
  font-size: 14.5px;
  padding: 13px 20px;
  box-shadow: var(--shadow-sm);
  transition: border-color 0.15s, box-shadow 0.15s;
}

#chat-input::placeholder {
  color: var(--muted-2);
}

#chat-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

#send-btn {
  display: flex;
  align-items: center;
  gap: 7px;
  flex: 0 0 auto;
  background: var(--accent);
  border: none;
  border-radius: var(--radius-pill);
  color: #fff;
  font: inherit;
  font-size: 14px;
  font-weight: 550;
  padding: 13px 20px;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
}

#send-btn:hover:not(:disabled) {
  background: var(--accent-hover);
}

#send-btn:active:not(:disabled) {
  transform: scale(0.97);
}

#send-btn:disabled {
  opacity: 0.45;
  cursor: default;
}

/* --------------------------------------------------------- debug panel */

.debug-panel-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(11, 9, 7, 0.34);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s;
  z-index: 40;
}

.debug-panel-backdrop.active {
  opacity: 1;
  pointer-events: auto;
}

.debug-panel {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(560px, 92vw);
  background: var(--surface);
  border-left: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
  padding: 20px 22px;
  overflow-y: auto;
  z-index: 50;
  transition: transform 0.24s ease;
}

.debug-panel[hidden] {
  display: block;
  transform: translateX(100%);
  pointer-events: none;
}

.debug-panel:not([hidden]) {
  transform: translateX(0);
}

.debug-panel-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
}

.debug-panel h2 {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
}

.debug-close-btn {
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--muted);
  cursor: pointer;
  flex: 0 0 auto;
  transition: background 0.15s;
}

.debug-close-btn:hover {
  background: var(--surface-3);
}

.debug-close-btn svg {
  width: 15px;
  height: 15px;
}

.debug-empty {
  font-size: 13px;
  color: var(--muted-2);
  margin: 0;
}

.debug-block {
  margin-bottom: 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.debug-block-title {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  background: var(--surface-2);
  border-bottom: 1px solid var(--border);
  padding: 8px 12px;
}

.debug-block-body {
  padding: 11px 12px;
  font-size: 12px;
}

.debug-block-body pre {
  margin: 0;
  font-family: var(--mono);
  font-size: 11.5px;
  line-height: 1.55;
  color: var(--muted);
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 340px;
  overflow-y: auto;
}

.chunk-card {
  border: 1px solid var(--border);
  border-left: 2px solid var(--accent-line);
  border-radius: 10px;
  padding: 10px 11px;
  margin-bottom: 9px;
  font-size: 12px;
  line-height: 1.55;
  color: var(--muted);
  background: var(--surface-2);
}

.chunk-card:last-child {
  margin-bottom: 0;
}

.chunk-meta {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 11px;
  color: var(--accent);
  margin-bottom: 6px;
  font-variant-numeric: tabular-nums;
}

.chunk-meta svg {
  width: 13px;
  height: 13px;
  flex: 0 0 auto;
}

.wire-chat {
  display: flex;
  flex-direction: column;
  gap: 7px;
  margin-bottom: 9px;
}

.wire-msg {
  border: 1px solid var(--border);
  border-left: 2px solid var(--border-strong);
  border-radius: 7px;
  background: var(--surface);
  padding: 7px 10px;
}

.wire-msg-role {
  display: flex;
  align-items: center;
  gap: 7px;
  flex-wrap: wrap;
  font-family: var(--mono);
  font-size: 9.5px;
  font-weight: 650;
  letter-spacing: 0.09em;
  color: var(--muted-2);
  margin-bottom: 4px;
}

.wire-kind {
  font-family: "Inter", sans-serif;
  font-size: 9.5px;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: none;
  padding: 1px 6px;
  border-radius: var(--radius-pill);
}

.wire-kind.prompt {
  background: var(--ok-soft);
  color: var(--ok);
}

.wire-kind.context {
  background: var(--warn-soft);
  color: var(--warn);
}

.wire-msg-note {
  font-size: 10.5px;
  line-height: 1.45;
  color: var(--muted-2);
  margin-bottom: 5px;
}

.wire-msg.origin-context {
  border-left-color: var(--warn);
  background: var(--warn-soft);
}

.wire-msg.origin-context .wire-msg-role {
  color: var(--warn);
}

.wire-origin {
  font-family: "Inter", sans-serif;
  font-size: 9.5px;
  font-weight: 550;
  letter-spacing: 0.02em;
  text-transform: none;
  padding: 1px 6px;
  border-radius: var(--radius-pill);
  background: var(--surface-3);
  color: var(--muted);
}

.wire-origin.new {
  background: var(--accent-soft);
  color: var(--accent);
}

.wire-origin.turn {
  background: var(--warn-soft);
  color: var(--warn);
}

.wire-origin.absent {
  background: transparent;
  color: var(--muted-2);
  border: 1px dashed var(--border-strong);
}

/* an absent system prompt is shown, but visually muted */
.wire-msg.origin-absent {
  background: transparent;
  border-style: dashed;
  border-left-color: var(--border-strong);
}

.wire-msg.origin-absent .wire-msg-content {
  color: var(--muted-2);
  font-style: italic;
}

.wire-msg.origin-history {
  opacity: 0.82;
}

.wire-msg-content {
  font-size: 12px;
  line-height: 1.55;
  color: var(--text);
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 220px;
  overflow-y: auto;
}

.wire-msg.user {
  border-left-color: var(--accent);
}

.wire-msg.user .wire-msg-role {
  color: var(--accent);
}

.wire-msg.assistant {
  background: var(--surface-2);
}

.wire-msg.system {
  border-left-color: var(--ok);
  background: var(--ok-soft);
}

.wire-msg.system .wire-msg-role {
  color: var(--ok);
}

.wire-msg.thinking {
  border-left-color: var(--muted-2);
  background: var(--surface-2);
}

.wire-msg.thinking .wire-msg-content {
  color: var(--muted);
  font-style: italic;
}

.wire-msg.tool_use,
.wire-msg.tool_result {
  border-left-color: var(--warn);
  background: var(--warn-soft);
}

.wire-msg.tool_use .wire-msg-role,
.wire-msg.tool_result .wire-msg-role {
  color: var(--warn);
}

.wire-msg.tool_use .wire-msg-content,
.wire-msg.tool_result .wire-msg-content {
  font-family: var(--mono);
  font-size: 11px;
}

.wire-raw-toggle {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  color: var(--muted);
  font: inherit;
  font-size: 11px;
  padding: 4px 11px;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.wire-raw-toggle:hover {
  background: var(--surface-3);
  color: var(--text);
}

.wire-turn {
  border: 1px solid var(--border);
  border-radius: 9px;
  overflow: hidden;
  margin-bottom: 9px;
}

.wire-turn:last-child {
  margin-bottom: 0;
}

.wire-turn-head {
  display: flex;
  align-items: center;
  gap: 9px;
  width: 100%;
  background: var(--surface-2);
  border: none;
  border-bottom: 1px solid var(--border);
  color: var(--text);
  font: inherit;
  font-size: 11.5px;
  text-align: left;
  padding: 8px 11px;
  cursor: pointer;
  transition: background 0.15s;
}

.wire-turn-head:hover {
  background: var(--surface-3);
}

.wire-turn-head::before {
  content: "";
  width: 0;
  height: 0;
  flex: 0 0 auto;
  border-left: 5px solid var(--muted-2);
  border-top: 4px solid transparent;
  border-bottom: 4px solid transparent;
  transform: rotate(90deg);
  transition: transform 0.15s;
}

.wire-turn-head.collapsed {
  border-bottom-color: transparent;
}

.wire-turn-head.collapsed::before {
  transform: rotate(0deg);
}

.wire-turn-label {
  font-weight: 650;
  color: var(--accent);
  white-space: nowrap;
  flex: 0 0 auto;
}

.wire-turn-q {
  flex: 1 1 auto;
  min-width: 0;
  color: var(--muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.wire-turn-size {
  flex: 0 0 auto;
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--muted-2);
  font-variant-numeric: tabular-nums;
}

.wire-turn-body {
  padding: 10px 11px;
}

.wire-stats {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid var(--accent-line);
  border-radius: 7px;
  padding: 6px 9px;
  margin-bottom: 9px;
  font-variant-numeric: tabular-nums;
}

.wire-note {
  font-size: 12px;
  line-height: 1.5;
  color: var(--muted);
  border-left: 2px solid var(--accent-line);
  padding-left: 10px;
  margin-bottom: 10px;
}

.wire-payload {
  margin: 0;
  font-family: var(--mono);
  font-size: 11px;
  line-height: 1.6;
  color: var(--text);
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 11px 12px;
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 420px;
  overflow-y: auto;
}

/* the ===== SECTION ===== rules inside the payload read as dividers */
.wire-payload::-webkit-scrollbar {
  width: 9px;
}

.wire-payload::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: var(--radius-pill);
  border: 2px solid transparent;
  background-clip: content-box;
}

/* --------------------------------------------------- how-it-works modal */

.hiw-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(11, 9, 7, 0.42);
  z-index: 60;
}

.hiw-backdrop:not([hidden]) {
  display: block;
}

.hiw-modal {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: min(720px, 94vw);
  max-height: 88vh;
  overflow-y: auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 22px 24px 26px;
  z-index: 70;
}

.hiw-modal[hidden] {
  display: none;
}

.hiw-modal-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
}

.hiw-modal-header h2 {
  margin: 0;
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.015em;
  color: var(--text-strong);
}

.hiw-modal .debug-close-btn {
  margin-top: 1px;
}

.hiw-note {
  margin: 8px 0 20px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

.hiw-steps {
  display: flex;
  align-items: center;
  gap: 4px;
}

.hiw-steps:not(.hiw-steps-branch) {
  flex-wrap: wrap;
  justify-content: center;
}

.hiw-steps-branch {
  flex-direction: column;
  gap: 0;
}

.hiw-box {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 14px;
  text-align: center;
  min-width: 118px;
  max-width: 320px;
}

.hiw-box-label {
  font-size: 13px;
  font-weight: 550;
  color: var(--text-strong);
  line-height: 1.35;
}

.hiw-box-sub {
  margin-top: 4px;
  font-size: 11.5px;
  line-height: 1.45;
  color: var(--muted-2);
}

.hiw-box.accent {
  background: var(--accent-soft);
  border-color: var(--accent-line);
}

.hiw-box.accent .hiw-box-label {
  color: var(--accent);
}

.hiw-box.tool {
  background: var(--warn-soft);
  border-color: rgba(255, 115, 0, 0.35);
}

.hiw-box.tool .hiw-box-label {
  color: var(--warn);
}

.hiw-box.rag {
  background: var(--ok-soft);
  border-color: rgba(129, 176, 154, 0.45);
}

.hiw-box.rag .hiw-box-label {
  color: var(--ok);
}

.hiw-box.carried {
  border-style: dashed;
}

.hiw-arrow-wrap {
  display: flex;
  align-items: center;
  gap: 5px;
  color: var(--muted-2);
  flex: 0 0 auto;
}

.hiw-arrow-wrap svg {
  width: 22px;
  height: 22px;
}

.hiw-arrow-wrap.down {
  flex-direction: column;
  gap: 2px;
  padding: 6px 0;
}

.hiw-arrow-wrap.down svg {
  width: 18px;
  height: 18px;
  transform: rotate(90deg);
}

.hiw-steps:not(.hiw-steps-branch) .hiw-arrow-wrap:not(.down) svg {
  width: 24px;
  height: 24px;
}

.hiw-arrow-label {
  font-size: 11px;
  color: var(--muted-2);
  white-space: nowrap;
}

.hiw-branches {
  display: flex;
  gap: 18px;
  align-items: flex-start;
  justify-content: center;
  width: 100%;
  flex-wrap: wrap;
}

.hiw-branch {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  flex: 1 1 200px;
  max-width: 300px;
}

.hiw-branch-label {
  font-size: 11px;
  font-weight: 650;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  margin-bottom: 8px;
}

.hiw-branch-label.yes {
  background: var(--ok-soft);
  color: var(--ok);
}

.hiw-branch-label.no {
  background: var(--surface-3);
  color: var(--muted);
}

.hiw-stack {
  margin-top: 8px;
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.hiw-stack-item {
  font-size: 11.5px;
  color: var(--muted);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 3px 8px;
}

.hiw-stage-label {
  align-self: stretch;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--muted-2);
  border-top: 1px solid var(--border);
  margin-top: 20px;
  padding-top: 14px;
  margin-bottom: 12px;
}

.hiw-stage-label:first-child {
  border-top: none;
  margin-top: 0;
  padding-top: 0;
}

/* ------------------------------------------------ how-RAG-works walkthrough */

.ragviz-btn svg {
  width: 14px;
  height: 14px;
}

.ragviz-modal {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: min(880px, 95vw);
  max-height: 90vh;
  overflow-y: auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 22px 26px 28px;
  z-index: 70;
}

.ragviz-modal[hidden] {
  display: none;
}

.ragviz-steps {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.rv-step {
  border-left: 2px solid var(--border);
  padding: 0 0 18px 18px;
  position: relative;
}

.rv-step:last-child {
  border-left-color: transparent;
  padding-bottom: 0;
}

.rv-step-head {
  display: flex;
  align-items: flex-start;
  gap: 11px;
  margin-bottom: 11px;
}

.rv-step-num {
  position: absolute;
  left: -13px;
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 12px;
  font-weight: 650;
  flex: 0 0 auto;
}

.rv-step-title {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text-strong);
  padding-left: 16px;
}

.rv-step-sub {
  font-size: 12.5px;
  color: var(--muted);
  padding-left: 16px;
  margin-top: 2px;
}

.rv-note {
  margin: 0 0 11px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
}

.vd-figure {
  margin: 0 0 12px;
  padding: 10px 12px 4px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-2);
  overflow-x: auto;
}

.vd-figure svg {
  display: block;
  min-width: 520px;
}

.vd-axis { stroke: var(--border-strong); stroke-width: 1; }

.vd-bar.pos { fill: var(--accent); }
.vd-bar.neg { fill: var(--violet, #6d5bd0); }

.vd-caption.dim { fill: var(--muted-2); }

.vd-cell {
  stroke: var(--border-strong);
  stroke-width: 1;
}

.vd-zero {
  fill: var(--surface);
}

.vd-on {
  fill: var(--accent);
  stroke: var(--accent);
}

.vd-on-q {
  fill: var(--warn);
  stroke: var(--warn);
}

.vd-label {
  font-family: "Inter", sans-serif;
  font-size: 11px;
  font-weight: 600;
  fill: var(--text);
}

.vd-term {
  font-family: var(--mono);
  font-size: 10px;
  fill: var(--accent);
  text-anchor: middle;
}

.vd-weight {
  font-family: var(--mono);
  font-size: 9px;
  fill: var(--muted-2);
  text-anchor: middle;
}

.vd-caption {
  font-family: "Inter", sans-serif;
  font-size: 10px;
  fill: var(--muted-2);
}

.vd-link {
  stroke: var(--muted-2);
  stroke-width: 1;
  stroke-dasharray: 2 3;
}

.rv-details {
  margin-top: 4px;
}

.rv-details summary {
  font-size: 11.5px;
  color: var(--accent);
  cursor: pointer;
  padding: 3px 0;
  list-style: none;
}

.rv-details summary::-webkit-details-marker {
  display: none;
}

.rv-details summary::before {
  content: "+ ";
  font-weight: 650;
}

.rv-details[open] summary::before {
  content: "− ";
}

.rv-caveat {
  margin: 0 0 12px;
  padding: 9px 12px;
  background: var(--warn-soft);
  border-left: 2px solid var(--warn);
  border-radius: 0 7px 7px 0;
  font-size: 12px;
  line-height: 1.6;
  color: var(--text);
}

.rv-outro {
  margin: 14px 0 0;
  padding: 11px 13px;
  background: var(--accent-soft);
  border: 1px solid var(--accent-line);
  border-radius: var(--radius);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--text);
}

.rv-picker select {
  max-width: 480px;
}

/* --- chunks --- */

.rv-chunk {
  border: 1px solid var(--border);
  border-radius: 9px;
  margin-bottom: 8px;
  overflow: hidden;
}

.rv-chunk-meta {
  display: flex;
  align-items: baseline;
  gap: 9px;
  flex-wrap: wrap;
  padding: 6px 10px;
  background: var(--surface-2);
  border-bottom: 1px solid var(--border);
}

.rv-chunk-label {
  font-size: 11px;
  font-weight: 650;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent);
}

.rv-chunk-stats {
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--muted-2);
}

.rv-chunk-text {
  padding: 9px 11px;
  font-size: 11.5px;
  line-height: 1.6;
  color: var(--text);
  max-height: 132px;
  overflow-y: auto;
  white-space: pre-wrap;
  word-break: break-word;
}

.rv-overlap {
  background: var(--warn-soft);
  border-bottom: 1px dashed var(--warn);
  color: var(--warn);
}

.rv-more {
  font-size: 11.5px;
  color: var(--muted-2);
  padding: 4px 2px;
}

/* --- vectors --- */

.rv-vec {
  display: flex;
  gap: 13px;
  align-items: flex-start;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
}

.rv-vec:last-child {
  border-bottom: none;
}

.rv-vec-label {
  flex: 0 0 66px;
  font-size: 11px;
  font-weight: 650;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent);
  padding-top: 2px;
}

.rv-vec-terms {
  flex: 1 1 auto;
  min-width: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 3px 16px;
}

.rv-term {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 11px;
}

.rv-term-name {
  flex: 0 0 84px;
  font-family: var(--mono);
  color: var(--text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.rv-term-bar {
  flex: 1 1 auto;
  height: 5px;
  border-radius: 3px;
  background: var(--surface-3);
  overflow: hidden;
}

.rv-term-fill {
  display: block;
  height: 100%;
  background: var(--accent);
  border-radius: 3px;
}

.rv-term-val {
  flex: 0 0 30px;
  text-align: right;
  font-family: var(--mono);
  font-size: 10px;
  color: var(--muted-2);
}

/* --- retrieval --- */

.rv-query-row {
  display: flex;
  gap: 8px;
  margin-bottom: 9px;
}

.rv-query-input {
  flex: 1 1 auto;
  min-width: 0;
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-pill);
  color: var(--text);
  font: inherit;
  font-size: 13px;
  padding: 9px 15px;
}

.rv-query-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.rv-query-btn {
  flex: 0 0 auto;
  background: var(--accent);
  border: none;
  border-radius: var(--radius-pill);
  color: #fff;
  font: inherit;
  font-size: 13px;
  font-weight: 550;
  padding: 9px 17px;
  cursor: pointer;
}

.rv-query-btn:hover {
  background: var(--accent-hover);
}

.rv-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 13px;
}

.rv-chip {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  color: var(--muted);
  font: inherit;
  font-size: 11.5px;
  padding: 4px 11px;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

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

.rv-score {
  display: flex;
  align-items: center;
  gap: 11px;
  padding: 7px 9px;
  border: 1px solid transparent;
  border-radius: 8px;
  opacity: 0.55;
}

.rv-score.selected {
  opacity: 1;
  background: var(--accent-soft);
  border-color: var(--accent-line);
}

.rv-score-rank {
  flex: 0 0 26px;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--muted-2);
}

.rv-score-mid {
  flex: 1 1 auto;
  min-width: 0;
}

.rv-score-doc {
  font-size: 11.5px;
  font-weight: 600;
  color: var(--text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.rv-score-snip {
  font-size: 11px;
  color: var(--muted-2);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.rv-score-right {
  flex: 0 0 190px;
  display: flex;
  align-items: center;
  gap: 7px;
}

.rv-score-bar {
  flex: 1 1 auto;
  height: 6px;
  border-radius: 3px;
  background: var(--surface-3);
  overflow: hidden;
}

.rv-score-fill {
  display: block;
  height: 100%;
  background: var(--accent);
  border-radius: 3px;
}

.rv-score-val {
  flex: 0 0 36px;
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--muted);
  text-align: right;
}

.rv-score-tag {
  flex: 0 0 auto;
  font-size: 9.5px;
  font-weight: 600;
  padding: 1px 6px;
  border-radius: var(--radius-pill);
  white-space: nowrap;
}

.rv-score-tag.yes {
  background: var(--ok-soft);
  color: var(--ok);
}

.rv-score-tag.no {
  background: var(--surface-3);
  color: var(--muted-2);
}

@media (max-width: 760px) {
  .rv-score {
    flex-wrap: wrap;
  }

  .rv-score-right {
    flex: 1 1 100%;
  }
}

/* --------------------------------------------------------- access gate */

.gate {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: grid;
  place-items: center;
  background: var(--paper);
  padding: 24px;
}

.gate[hidden] { display: none; }

.gate-card {
  width: min(360px, 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 10px;
  padding: 32px 28px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.gate-icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  background: var(--accent-soft);
  color: var(--accent);
  margin-bottom: 2px;
}

.gate-icon svg { width: 21px; height: 21px; }

.gate-card h2 {
  margin: 0;
  font-size: 19px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text-strong);
}

.gate-card p {
  margin: 0 0 4px;
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--muted);
}

.gate-card input {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-pill);
  color: var(--text);
  font: inherit;
  font-size: 14px;
  padding: 11px 18px;
  text-align: center;
}

.gate-card input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.gate-card button {
  width: 100%;
  background: var(--accent);
  border: none;
  border-radius: var(--radius-pill);
  color: #fff;
  font: inherit;
  font-size: 14px;
  font-weight: 550;
  padding: 11px 18px;
  cursor: pointer;
}

.gate-card button:hover:not(:disabled) { background: var(--accent-hover); }
.gate-card button:disabled { opacity: 0.6; cursor: default; }

.gate-error {
  margin: 0;
  font-size: 12.5px;
  color: var(--warn);
}

/* ---------------------------------------------------------- scrollbars */

.chat-window::-webkit-scrollbar,
.sidebar::-webkit-scrollbar,
.debug-panel::-webkit-scrollbar,
.sources-list::-webkit-scrollbar {
  width: 9px;
  height: 9px;
}

.chat-window::-webkit-scrollbar-track,
.sidebar::-webkit-scrollbar-track,
.debug-panel::-webkit-scrollbar-track,
.sources-list::-webkit-scrollbar-track {
  background: transparent;
}

.chat-window::-webkit-scrollbar-thumb,
.sidebar::-webkit-scrollbar-thumb,
.debug-panel::-webkit-scrollbar-thumb,
.sources-list::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: var(--radius-pill);
  border: 2px solid transparent;
  background-clip: content-box;
}

/* -------------------------------------------------------------- mobile */

@media (max-width: 900px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    border-right: none;
    border-bottom: 1px solid var(--border);
    max-height: 40vh;
  }

  .msg.user {
    font-size: 19px;
  }
}