:root {
  --bg: var(--tg-theme-bg-color, #f6f7f8);
  --surface: var(--tg-theme-secondary-bg-color, #ffffff);
  --surface-strong: #ffffff;
  --text: var(--tg-theme-text-color, #111318);
  --hint: var(--tg-theme-hint-color, #707782);
  --link: var(--tg-theme-link-color, #2481cc);
  --button: var(--tg-theme-button-color, #2481cc);
  --button-text: var(--tg-theme-button-text-color, #ffffff);
  --danger: #d84a4a;
  --border: rgba(17, 19, 24, 0.12);
  --shadow: rgba(17, 19, 24, 0.16);
  --header-height: 52px;
  --composer-min-height: 58px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

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

button,
textarea {
  font: inherit;
}

button {
  -webkit-tap-highlight-color: transparent;
}

.app-shell {
  position: relative;
  width: 100%;
  height: 100dvh;
  min-height: 360px;
  overflow: hidden;
  background: var(--bg);
}

.chat-shell {
  position: relative;
  display: grid;
  grid-template-rows: var(--header-height) minmax(0, 1fr) auto;
  width: 100%;
  height: 100%;
  padding-bottom: env(safe-area-inset-bottom);
}

.topbar {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr) 48px;
  align-items: center;
  height: var(--header-height);
  padding: env(safe-area-inset-top) 8px 0;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.topbar__title {
  min-width: 0;
  overflow: hidden;
  text-align: center;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 17px;
  font-weight: 650;
  letter-spacing: 0;
}

.topbar__spacer {
  width: 40px;
  height: 40px;
}

.messages {
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-height: 0;
  padding: 14px 12px 18px;
  overflow-x: hidden;
  overflow-y: auto;
  scroll-behavior: smooth;
}

.message {
  max-width: min(82%, 680px);
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  overflow-wrap: anywhere;
  line-height: 1.38;
  font-size: 15px;
  letter-spacing: 0;
}

.message--user {
  align-self: flex-end;
  border-color: transparent;
  background: var(--button);
  color: var(--button-text);
}

.message--assistant {
  align-self: flex-start;
}

.message--user .message__body {
  white-space: pre-wrap;
}

.message__body > :first-child {
  margin-top: 0;
}

.message__body > :last-child {
  margin-bottom: 0;
}

.message__body p {
  margin: 0 0 8px;
}

.message__body h3,
.message__body h4,
.message__body h5 {
  margin: 10px 0 6px;
  font-size: 15px;
  line-height: 1.3;
  letter-spacing: 0;
}

.message__body ul,
.message__body ol {
  margin: 6px 0 8px;
  padding-left: 20px;
}

.message__body li {
  margin: 3px 0;
}

.message__body pre {
  margin: 8px 0;
  padding: 9px 10px;
  overflow-x: auto;
  border-radius: 8px;
  background: color-mix(in srgb, var(--text) 7%, var(--surface));
}

.message__body code {
  padding: 1px 4px;
  border-radius: 5px;
  background: color-mix(in srgb, var(--text) 7%, var(--surface));
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.92em;
}

.message__body pre code {
  padding: 0;
  background: transparent;
  white-space: pre;
}

.message__footer {
  margin-top: 8px;
  padding-top: 7px;
  border-top: 1px solid var(--border);
  color: var(--hint);
  font-size: 13px;
  line-height: 1.3;
}

.message--empty {
  align-self: center;
  margin: auto 0;
  color: var(--hint);
  background: transparent;
  border-color: transparent;
}

.service-message {
  position: absolute;
  left: 50%;
  top: 50%;
  z-index: 30;
  max-width: min(84vw, 360px);
  transform: translate(-50%, -50%);
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface-strong);
  box-shadow: 0 8px 28px var(--shadow);
  color: var(--text);
  text-align: center;
  line-height: 1.35;
}

.composer {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr) 42px 42px;
  gap: 8px;
  align-items: end;
  min-height: var(--composer-min-height);
  padding: 8px 10px max(8px, env(safe-area-inset-bottom));
  border-top: 1px solid var(--border);
  background: var(--surface);
}

.composer__input {
  width: 100%;
  min-height: 40px;
  max-height: 33dvh;
  resize: none;
  overflow-y: auto;
  padding: 9px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  outline: none;
  background: var(--bg);
  color: var(--text);
  line-height: 1.35;
  font-size: 16px;
  letter-spacing: 0;
}

.composer__input:focus {
  border-color: color-mix(in srgb, var(--button) 60%, var(--border));
}

.icon-button {
  position: relative;
  display: inline-grid;
  place-items: center;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 1px solid transparent;
  border-radius: 8px;
  background: transparent;
  color: var(--text);
  cursor: pointer;
}

.icon-button:disabled {
  cursor: default;
  opacity: 0.42;
}

.icon-button:focus-visible,
.action-button:focus-visible,
.settings-panel__item:focus-visible {
  outline: 2px solid var(--button);
  outline-offset: 2px;
}

.composer__side {
  background: var(--bg);
  border-color: var(--border);
}

.composer__send {
  background: var(--button);
  color: var(--button-text);
}

.icon {
  position: relative;
  display: inline-block;
  width: 20px;
  height: 20px;
}

.icon-menu,
.icon-menu::before,
.icon-menu::after {
  width: 20px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
}

.icon-menu::before,
.icon-menu::after {
  content: "";
  position: absolute;
  left: 0;
}

.icon-menu {
  height: 2px;
}

.icon-menu::before {
  top: -7px;
}

.icon-menu::after {
  top: 7px;
}

.icon-close::before,
.icon-close::after {
  content: "";
  position: absolute;
  left: 9px;
  top: 2px;
  width: 2px;
  height: 16px;
  border-radius: 2px;
  background: currentColor;
}

.icon-close::before {
  transform: rotate(45deg);
}

.icon-close::after {
  transform: rotate(-45deg);
}

.icon-plus::before,
.icon-plus::after {
  content: "";
  position: absolute;
  background: currentColor;
  border-radius: 2px;
}

.icon-plus::before {
  left: 3px;
  top: 9px;
  width: 14px;
  height: 2px;
}

.icon-plus::after {
  left: 9px;
  top: 3px;
  width: 2px;
  height: 14px;
}

.icon-dots::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 9px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: currentColor;
  box-shadow: 7px 0 0 currentColor, 14px 0 0 currentColor;
}

.icon-send::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 3px;
  width: 12px;
  height: 12px;
  border-top: 2px solid currentColor;
  border-right: 2px solid currentColor;
  transform: rotate(-45deg);
}

.icon-send::after {
  content: "";
  position: absolute;
  left: 9px;
  top: 5px;
  width: 2px;
  height: 13px;
  border-radius: 2px;
  background: currentColor;
}

.icon-stop::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 5px;
  width: 10px;
  height: 10px;
  border-radius: 2px;
  background: currentColor;
}

.icon-mic::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 2px;
  width: 6px;
  height: 11px;
  border: 2px solid currentColor;
  border-radius: 6px;
}

.icon-mic::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  width: 10px;
  height: 8px;
  border-bottom: 2px solid currentColor;
  border-left: 2px solid transparent;
  border-right: 2px solid transparent;
  border-radius: 0 0 9px 9px;
}

.drawer {
  position: absolute;
  left: 0;
  top: 0;
  z-index: 50;
  display: grid;
  grid-template-rows: var(--header-height) minmax(0, 1fr) auto;
  width: min(86vw, 360px);
  height: 100%;
  padding-top: env(safe-area-inset-top);
  background: var(--surface);
  border-right: 1px solid var(--border);
  transform: translateX(-102%);
  transition: transform 160ms ease;
}

.app-shell.drawer-open .drawer {
  transform: translateX(0);
}

.drawer-backdrop {
  position: absolute;
  inset: 0;
  z-index: 45;
  display: none;
  background: rgba(0, 0, 0, 0.32);
}

.app-shell.drawer-open .drawer-backdrop {
  display: block;
}

.drawer__header {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr) 48px;
  align-items: center;
  height: var(--header-height);
  padding: 0 8px;
  border-bottom: 1px solid var(--border);
}

.drawer__title {
  min-width: 0;
  overflow: hidden;
  text-align: center;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 16px;
  font-weight: 650;
}

.topic-list {
  min-height: 0;
  overflow-y: auto;
  padding: 8px;
}

.topic-item {
  display: block;
  width: 100%;
  min-height: 42px;
  margin: 0 0 4px;
  padding: 10px 12px;
  border: 1px solid transparent;
  border-radius: 8px;
  background: transparent;
  color: var(--text);
  text-align: left;
  cursor: pointer;
}

.topic-item.is-active {
  border-color: color-mix(in srgb, var(--button) 44%, var(--border));
  background: color-mix(in srgb, var(--button) 10%, var(--surface));
}

.topic-item__title {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 15px;
  font-weight: 560;
}

.drawer__actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  padding: 10px;
  border-top: 1px solid var(--border);
}

.action-button {
  min-height: 38px;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
}

.action-button:disabled {
  cursor: default;
  opacity: 0.45;
}

.action-button--danger {
  color: var(--danger);
}

.settings-panel {
  position: absolute;
  left: 10px;
  bottom: calc(var(--composer-min-height) + max(10px, env(safe-area-inset-bottom)));
  z-index: 35;
  display: grid;
  width: min(320px, calc(100vw - 20px));
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface-strong);
  box-shadow: 0 8px 28px var(--shadow);
}

.settings-panel__header {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 40px;
  align-items: center;
  gap: 8px;
  min-height: 48px;
  padding: 4px 6px 4px 12px;
  border-bottom: 1px solid var(--border);
}

.settings-panel__section {
  display: grid;
  gap: 10px;
  padding: 12px;
  border-bottom: 1px solid var(--border);
}

.settings-panel__title {
  font-size: 15px;
  font-weight: 650;
  letter-spacing: 0;
}

.setting-row {
  display: grid;
  gap: 6px;
}

.setting-row__label {
  color: var(--hint);
  font-size: 13px;
  line-height: 1.2;
}

.segmented {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px;
  padding: 3px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
}

.segmented__button {
  min-width: 0;
  min-height: 34px;
  padding: 7px 8px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--text);
  cursor: pointer;
  font-size: 14px;
}

.segmented__button.is-active {
  background: var(--button);
  color: var(--button-text);
}

.settings-panel__toggle {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
  align-items: center;
  min-height: 38px;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  cursor: pointer;
  text-align: left;
}

.settings-panel__value {
  color: var(--hint);
  font-size: 13px;
}

.settings-panel__item {
  display: block;
  min-height: 42px;
  padding: 11px 12px;
  border: 0;
  border-bottom: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  text-align: left;
  text-decoration: none;
  cursor: pointer;
}

.settings-panel__item:last-child {
  border-bottom: 0;
}

.settings-panel__item:disabled {
  cursor: default;
  opacity: 0.45;
}

.settings-panel__link {
  color: var(--link);
}

@media (min-width: 860px) {
  .app-shell {
    display: grid;
    grid-template-columns: 320px minmax(0, 1fr);
  }

  .drawer {
    position: relative;
    z-index: 1;
    width: 320px;
    transform: none;
  }

  .drawer-backdrop,
  .app-shell.drawer-open .drawer-backdrop {
    display: none;
  }

  #drawerOpen,
  #drawerClose {
    visibility: hidden;
  }

  .chat-shell {
    grid-column: 2;
  }

  .message {
    max-width: min(72%, 760px);
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: var(--tg-theme-bg-color, #111318);
    --surface: var(--tg-theme-secondary-bg-color, #1a1d23);
    --surface-strong: #20242b;
    --text: var(--tg-theme-text-color, #f5f6f7);
    --hint: var(--tg-theme-hint-color, #9aa0aa);
    --border: rgba(245, 246, 247, 0.12);
    --shadow: rgba(0, 0, 0, 0.38);
  }
}