:root {
  --bg: #f4f1e9;
  --bg-soft: #ece7db;
  --border: #d8d1c2;
  --border-strong: #c9bea9;
  --green: #183f36;
  --green-soft: #dce9e3;
  --gold: #aa8445;
  --gold-soft: #f3ead7;
  --surface: #fffdf8;
  --surface-raised: #ffffff;
  --text: #202722;
  --text-muted: #6f766f;
  --text-soft: #999d97;
  --danger: #a74953;
  --shadow: rgb(42 46 42 / 10%);
  color-scheme: light;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

:root[data-theme="dark"] {
  --bg: #161b19;
  --bg-soft: #202624;
  --border: #353c38;
  --border-strong: #46504b;
  --green: #d5ebe3;
  --green-soft: #243c34;
  --gold: #d1aa68;
  --gold-soft: #3b3121;
  --surface: #1d2320;
  --surface-raised: #242b27;
  --text: #f2f0e9;
  --text-muted: #aeb5af;
  --text-soft: #808982;
  --danger: #df7b84;
  --shadow: rgb(0 0 0 / 28%);
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
}

body.is-sidebar-open {
  overflow: hidden;
}

button,
textarea {
  font: inherit;
}

button,
label[for="file-input"] {
  -webkit-tap-highlight-color: transparent;
}

button:focus-visible,
textarea:focus-visible,
label[for="file-input"]:focus-within {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.48;
}

.lab-shell {
  display: grid;
  min-height: 100vh;
  grid-template-columns: 260px minmax(0, 1fr);
}

.lab-sidebar {
  display: flex;
  min-height: 100vh;
  flex-direction: column;
  padding: 24px 18px;
  border-right: 1px solid var(--border);
  background: var(--surface);
}

.lab-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 2px 6px 24px;
}

.lab-sidebar__close.icon-button,
.sidebar-toggle.icon-button,
.sidebar-backdrop {
  display: none;
}

.lab-brand__mark {
  display: grid;
  width: 43px;
  height: 43px;
  flex: 0 0 43px;
  place-items: center;
  border: 1px solid var(--gold);
  border-radius: 50%;
  background: var(--green);
  color: var(--surface);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.35rem;
}

.lab-brand strong,
.lab-brand span {
  display: block;
}

.lab-brand strong {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.25rem;
  font-weight: 500;
}

.lab-brand div > span {
  margin-top: 2px;
  color: var(--text-muted);
  font-size: 0.68rem;
}

.button,
.icon-button {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  font-size: 0.78rem;
  font-weight: 600;
}

.button {
  padding: 9px 14px;
}

.icon-button {
  width: 40px;
  padding: 0;
  font-size: 1.1rem;
}

.button:hover:not(:disabled),
.icon-button:hover:not(:disabled) {
  border-color: var(--gold);
}

.button--primary,
.button--send {
  border-color: var(--green);
  background: var(--green);
  color: var(--surface);
}

:root[data-theme="dark"] .button--primary,
:root[data-theme="dark"] .button--send {
  color: #15201c;
}

.button--quiet {
  border-color: var(--border);
  background: var(--bg-soft);
}

.lab-sidebar__new {
  width: 100%;
}

.lab-nav {
  display: grid;
  gap: 7px;
  margin-top: 24px;
}

.memory-summary {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 6px;
  padding: 3px 5px 7px;
}

.memory-summary > div {
  display: flex;
  min-width: 0;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 8px 9px;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--bg-soft);
}

.memory-summary > div span {
  overflow: hidden;
  color: var(--text-muted);
  font-size: 0.61rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.memory-summary > div strong {
  color: var(--gold);
  font-size: 0.68rem;
}

.memory-summary p {
  grid-column: 1 / -1;
  margin: 2px 4px 0;
  color: var(--text-soft);
  font-size: 0.58rem;
  line-height: 1.45;
}

.library-group {
  border-bottom: 1px solid var(--border);
  padding-bottom: 10px;
}

.library-group > summary,
.library-project > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 9px 8px;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 0.69rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  list-style: none;
  text-transform: uppercase;
}

.library-group > summary::-webkit-details-marker,
.library-project > summary::-webkit-details-marker {
  display: none;
}

.library-group > summary::before,
.library-project > summary::before {
  content: '›';
  color: var(--gold);
  font-size: 1rem;
  transform: rotate(0deg);
  transition: transform 150ms ease;
}

.library-group[open] > summary::before,
.library-project[open] > summary::before {
  transform: rotate(90deg);
}

.library-group > summary > span,
.library-project > summary > span {
  margin-right: auto;
}

.library-group > summary small,
.library-project > summary small {
  display: grid;
  min-width: 21px;
  min-height: 21px;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.58rem;
}

.chat-list {
  display: grid;
  gap: 5px;
  padding: 2px 0 5px;
}

.chat-list__item,
.library-add {
  width: 100%;
  border: 1px solid transparent;
  border-radius: 7px;
  background: transparent;
  color: var(--text);
  cursor: pointer;
  text-align: left;
}

.chat-list__item {
  display: block;
  padding: 9px 10px 8px 27px;
}

.chat-list__item:hover,
.chat-list__item.is-active {
  border-color: var(--border);
  background: var(--gold-soft);
}

.chat-list__item strong,
.chat-list__item small {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.chat-list__item strong {
  font-size: 0.72rem;
}

.chat-list__item small {
  margin-top: 3px;
  color: var(--text-muted);
  font-size: 0.59rem;
}

.library-project {
  margin: 0 4px 6px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-soft);
}

.library-project > summary {
  padding: 8px 9px;
  color: var(--text);
  font-size: 0.65rem;
  text-transform: none;
}

.chat-list--project {
  padding: 0 5px 4px;
}

.chat-list--project .chat-list__item {
  padding-left: 12px;
  background: var(--surface);
}

.library-add {
  padding: 8px 11px 10px;
  color: var(--text-muted);
  font-size: 0.62rem;
}

.library-add:hover {
  color: var(--gold);
}

.lab-nav__item {
  display: grid;
  min-height: 64px;
  grid-template-columns: 32px minmax(0, 1fr);
  align-items: center;
  gap: 10px;
  padding: 9px 10px;
  border: 1px solid transparent;
  border-radius: 8px;
  background: transparent;
  color: var(--text);
  cursor: pointer;
  text-align: left;
}

.lab-nav__item > span:first-child {
  display: grid;
  width: 28px;
  height: 28px;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: 50%;
  color: var(--text-muted);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 0.72rem;
}

.lab-nav__item.is-active {
  border-color: var(--border);
  background: var(--gold-soft);
}

.lab-nav__item.is-active > span:first-child {
  border-color: var(--gold);
  color: var(--gold);
}

.lab-nav__item strong,
.lab-nav__item small {
  display: block;
}

.lab-nav__item strong {
  font-size: 0.76rem;
}

.lab-nav__item small {
  margin-top: 3px;
  color: var(--text-muted);
  font-size: 0.65rem;
}

.lab-note {
  margin-top: auto;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-soft);
}

.lab-note strong {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 0.92rem;
  font-weight: 500;
}

.lab-note p {
  margin: 8px 0 0;
  color: var(--text-muted);
  font-size: 0.68rem;
  line-height: 1.5;
}

.chat-app {
  display: grid;
  min-width: 0;
  height: 100vh;
  grid-template-rows: auto minmax(0, 1fr) auto auto;
}

.chat-header {
  display: flex;
  min-height: 108px;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  padding: 19px clamp(24px, 4vw, 60px);
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

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

.chat-header__copy {
  min-width: 0;
}

.chat-header__eyebrow {
  color: var(--gold);
  font-size: 0.63rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.chat-header h1 {
  margin: 3px 0 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.7rem;
  font-weight: 500;
}

.chat-header p {
  margin: 5px 0 0;
  color: var(--text-muted);
  font-size: 0.73rem;
}

.chat-header__actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 9px;
}

.model-picker {
  display: grid;
  gap: 3px;
  min-width: 190px;
}

.model-picker > span {
  color: var(--text-soft);
  font-size: 0.55rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.model-picker select {
  width: 210px;
  min-height: 34px;
  padding: 6px 28px 6px 9px;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--surface);
  color: var(--text);
  font-size: 0.66rem;
}

.connection-state {
  display: inline-flex;
  min-height: 34px;
  align-items: center;
  gap: 7px;
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text-muted);
  font-size: 0.68rem;
}

.connection-state i,
.typing-indicator > span {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #57a473;
}

.connection-state[data-status="checking"] i {
  background: var(--gold);
}

.connection-state[data-status="error"] i {
  background: var(--danger);
}

.message__model {
  overflow: hidden;
  max-width: 230px;
  color: var(--text-soft);
  font-size: 0.58rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.messages {
  overflow-y: auto;
  padding: 32px clamp(24px, 8vw, 120px) 26px;
  scroll-behavior: smooth;
}

.message {
  display: grid;
  max-width: 880px;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 11px;
  margin: 0 auto 22px;
}

.message--user {
  grid-template-columns: minmax(0, 1fr) 38px;
}

.message--user .message__avatar {
  grid-column: 2;
  background: var(--gold);
}

.message--user .message__content {
  grid-column: 1;
  grid-row: 1;
  justify-self: end;
  border-color: rgb(170 132 69 / 40%);
  background: var(--gold-soft);
}

.message__avatar {
  display: grid;
  width: 36px;
  height: 36px;
  place-items: center;
  border-radius: 50%;
  background: var(--green);
  color: var(--surface);
  font-family: Georgia, "Times New Roman", serif;
}

:root[data-theme="dark"] .message__avatar {
  color: #15201c;
}

.message__content {
  min-width: 0;
  width: min(100%, 700px);
  padding: 13px 15px;
  border: 1px solid var(--border);
  border-radius: 5px 14px 14px;
  background: var(--surface);
  box-shadow: 0 5px 14px var(--shadow);
}

.message--user .message__content {
  border-radius: 14px 5px 14px 14px;
}

.message__content header {
  display: flex;
  align-items: center;
  gap: 9px;
}

.message__content header strong {
  font-size: 0.72rem;
}

.message__content time {
  color: var(--text-soft);
  font-size: 0.62rem;
}

.message__content p {
  margin: 8px 0 0;
  font-size: 0.83rem;
  line-height: 1.55;
  white-space: pre-wrap;
}

.message__files {
  display: grid;
  gap: 6px;
  margin-top: 10px;
}

.chapter-card {
  overflow: hidden;
  border: 1px solid var(--border-strong);
  border-radius: 10px;
  background: var(--surface-raised);
}

.chapter-card > header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 11px 12px;
  border-bottom: 1px solid var(--border);
  background: var(--gold-soft);
}

.chapter-card > header strong,
.chapter-card__eyebrow {
  display: block;
}

.chapter-card > header strong {
  margin-top: 3px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 0.9rem;
  font-weight: 500;
}

.chapter-card__eyebrow {
  color: var(--gold);
  font-size: 0.54rem;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.chapter-card__export {
  min-height: 34px;
  flex: 0 0 auto;
  padding: 6px 10px;
  font-size: 0.64rem;
}

.chapter-card__content {
  overflow-y: auto;
  max-height: 360px;
  padding: 15px 17px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 0.79rem;
  line-height: 1.65;
  white-space: pre-wrap;
}

.sent-file,
.prepared-file {
  display: grid;
  min-width: 0;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 9px;
  border: 1px solid var(--border);
  border-radius: 7px;
}

.sent-file {
  padding: 8px 9px;
  background: var(--surface);
}

.sent-file__badge,
.prepared-file__badge {
  display: grid;
  min-width: 46px;
  min-height: 30px;
  place-items: center;
  padding: 3px 7px;
  border-radius: 5px;
  background: var(--green-soft);
  color: var(--green);
  font-size: 0.58rem;
  font-weight: 700;
  text-transform: uppercase;
}

.sent-file strong,
.sent-file small,
.prepared-file strong,
.prepared-file small {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sent-file strong,
.prepared-file strong {
  font-size: 0.68rem;
}

.sent-file small,
.prepared-file small {
  margin-top: 2px;
  color: var(--text-muted);
  font-size: 0.6rem;
}

.typing-indicator,
.notice {
  width: min(880px, calc(100% - 48px));
  margin: 0 auto 10px;
}

.notice[data-tone="success"] {
  border-color: rgb(24 63 54 / 30%);
  background: var(--green-soft);
  color: var(--green);
}

.typing-indicator {
  display: flex;
  align-items: center;
  gap: 5px;
  color: var(--text-muted);
  font-size: 0.68rem;
}

.typing-indicator[hidden],
.notice[hidden],
.drop-overlay[hidden] {
  display: none;
}

.typing-indicator > span {
  width: 6px;
  height: 6px;
  animation: pulse 900ms infinite alternate;
}

.typing-indicator > span:nth-child(2) {
  animation-delay: 150ms;
}

.typing-indicator > span:nth-child(3) {
  margin-right: 4px;
  animation-delay: 300ms;
}

.notice {
  padding: 9px 12px;
  border: 1px solid rgb(167 73 83 / 40%);
  border-radius: 7px;
  background: rgb(167 73 83 / 9%);
  color: var(--danger);
  font-size: 0.7rem;
}

.composer {
  padding: 10px clamp(24px, 8vw, 120px) 22px;
}

.drop-zone {
  position: relative;
  width: min(880px, 100%);
  margin: auto;
  overflow: hidden;
  border: 1px solid var(--border-strong);
  border-radius: 14px;
  background: var(--surface-raised);
  box-shadow: 0 14px 35px var(--shadow);
}

.drop-zone.is-dragging {
  border-color: var(--gold);
}

.attachment-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 7px;
  padding: 11px 12px 0;
}

.prepared-file {
  padding: 7px 8px;
  background: var(--bg-soft);
}

.prepared-file[data-status="reading"] {
  border-color: color-mix(in srgb, var(--gold) 55%, var(--border));
}

.prepared-file[data-status="ready"] {
  border-color: color-mix(in srgb, var(--green) 32%, var(--border));
}

.prepared-file[data-status="error"] {
  border-color: color-mix(in srgb, var(--danger) 60%, var(--border));
}

.prepared-file small[data-status="reading"] {
  color: var(--gold);
}

.prepared-file small[data-status="ready"] {
  color: var(--green);
}

.prepared-file small[data-status="error"] {
  color: var(--danger);
}

.prepared-file button {
  display: grid;
  width: 28px;
  height: 28px;
  place-items: center;
  border: 0;
  border-radius: 50%;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1.1rem;
}

.prepared-file button:hover {
  background: var(--surface);
  color: var(--danger);
}

.composer__field {
  display: block;
  padding: 3px 12px;
}

.composer textarea {
  display: block;
  width: 100%;
  min-height: 54px;
  max-height: 190px;
  resize: none;
  padding: 14px 6px 9px;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--text);
  font-size: 0.84rem;
  line-height: 1.5;
}

.composer textarea::placeholder {
  color: var(--text-soft);
}

.composer__footer {
  display: flex;
  min-height: 56px;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 8px 12px 11px;
  border-top: 1px solid var(--border);
}

.composer__tools,
.composer__send {
  display: flex;
  align-items: center;
  gap: 10px;
}

.attachment-button {
  cursor: pointer;
  user-select: none;
}

.composer__hint,
.composer__send > span {
  color: var(--text-soft);
  font-size: 0.61rem;
}

.composer__send kbd {
  padding: 1px 4px;
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 4px;
  background: var(--bg-soft);
  font: inherit;
}

.button--send {
  min-width: 104px;
}

.button--send > span {
  font-size: 1rem;
}

.drop-overlay {
  position: absolute;
  inset: 0;
  z-index: 2;
  display: grid;
  place-content: center;
  background: var(--surface-raised);
  color: var(--text);
  text-align: center;
}

.drop-overlay strong {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.2rem;
  font-weight: 500;
}

.drop-overlay span {
  margin-top: 5px;
  color: var(--text-muted);
  font-size: 0.7rem;
}

.sr-only {
  position: absolute;
  overflow: hidden;
  width: 1px;
  height: 1px;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
}

@keyframes pulse {
  from {
    opacity: 0.3;
    transform: translateY(1px);
  }

  to {
    opacity: 1;
    transform: translateY(-1px);
  }
}

@media (max-width: 850px) {
  .lab-shell {
    grid-template-columns: 1fr;
  }

  .lab-sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    z-index: 40;
    width: min(88vw, 340px);
    min-height: 100dvh;
    max-height: 100dvh;
    overflow-y: auto;
    padding: 20px 18px;
    border-right: 1px solid var(--border);
    box-shadow: 18px 0 42px rgb(0 0 0 / 22%);
    transform: translateX(-105%);
    transition: transform 180ms ease;
  }

  .lab-shell[data-sidebar-open="true"] .lab-sidebar {
    transform: translateX(0);
  }

  .lab-brand {
    padding-bottom: 18px;
  }

  .lab-sidebar__close.icon-button,
  .sidebar-toggle.icon-button {
    display: inline-flex;
  }

  .lab-sidebar__close {
    margin-left: auto;
  }

  .sidebar-toggle {
    flex: 0 0 40px;
  }

  .sidebar-backdrop {
    position: fixed;
    inset: 0;
    z-index: 35;
    display: block;
    visibility: hidden;
    border: 0;
    background: rgb(10 16 13 / 46%);
    cursor: pointer;
    opacity: 0;
    transition: opacity 180ms ease, visibility 180ms ease;
  }

  .lab-shell[data-sidebar-open="true"] .sidebar-backdrop {
    visibility: visible;
    opacity: 1;
  }

  .lab-nav {
    display: grid;
  }

  .lab-note {
    display: block;
    margin-top: 20px;
  }

  .chat-app {
    height: 100dvh;
  }

  .chat-header {
    min-height: auto;
    align-items: flex-start;
    flex-wrap: wrap;
    padding: 15px 18px;
  }

  .chat-header__identity {
    width: 100%;
  }

  .chat-header__copy h1 {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .chat-header p,
  .connection-state,
  #clear-chat {
    display: none;
  }

  .chat-header__actions {
    width: 100%;
  }

  .model-picker {
    min-width: 0;
    flex: 1;
  }

  .model-picker select {
    width: 100%;
  }

  .messages {
    padding: 22px 16px 14px;
  }

  .composer {
    padding: 8px 12px 12px;
  }

  .composer__footer {
    align-items: stretch;
    flex-direction: column;
    gap: 8px;
  }

  .composer__send {
    justify-content: space-between;
  }

  .composer__hint {
    display: none;
  }

  .attachment-list {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 520px) {
  .lab-brand {
    padding-top: 0;
  }

  .chat-app {
    height: 100dvh;
  }

  .chat-header {
    gap: 10px;
  }

  .chat-header__actions {
    width: 100%;
    margin-left: 0;
  }

  .chat-header__actions .icon-button {
    width: 36px;
    min-height: 36px;
  }

  .message {
    grid-template-columns: 32px minmax(0, 1fr);
  }

  .message--user {
    grid-template-columns: minmax(0, 1fr) 32px;
  }

  .message__avatar {
    width: 31px;
    height: 31px;
  }

  .composer__send > span {
    display: none;
  }

  .button--send {
    width: 100%;
  }

  #export-chat {
    min-height: 34px;
    padding-inline: 10px;
    font-size: 0.65rem;
  }

  .chapter-card > header {
    align-items: flex-start;
    flex-direction: column;
  }
}