:root {
  color-scheme: var(--tg-color-scheme, light dark);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-synthesis: none;
  --page-bg: var(--tg-theme-bg-color, #242b31);
  --surface: var(--tg-theme-secondary-bg-color, #303b44);
  --surface-strong: color-mix(in srgb, var(--surface) 82%, var(--page-bg));
  --text: var(--tg-theme-text-color, #f4f7fa);
  --muted: var(--tg-theme-hint-color, #91a0ad);
  --accent: var(--tg-theme-button-color, #79c9f4);
  --accent-text: var(--tg-theme-button-text-color, #12202a);
  --link: var(--tg-theme-link-color, #79c9f4);
  --danger: var(--tg-theme-destructive-text-color, #ff6b72);
  --border: color-mix(in srgb, var(--muted) 25%, transparent);
  --focus: color-mix(in srgb, var(--accent) 35%, transparent);
}

* {
  box-sizing: border-box;
}

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

body {
  min-height: 0;
}

button,
textarea {
  font: inherit;
}

button {
  color: inherit;
}

.app-shell {
  display: grid;
  grid-template-rows: auto minmax(180px, 1fr) auto;
  width: 100%;
  height: 100vh;
  height: var(--app-height, 100dvh);
  min-width: 0;
  min-height: 0;
  margin: 0 auto;
  overflow: hidden;
  padding: max(14px, env(safe-area-inset-top)) max(12px, env(safe-area-inset-right))
    max(12px, env(safe-area-inset-bottom)) max(12px, env(safe-area-inset-left));
}

.app-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 3px 2px 13px;
}

.app-title {
  min-width: 0;
  flex: 1;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

h1,
h2,
p {
  margin: 0;
}

h1 {
  font-size: clamp(25px, 7vw, 34px);
  line-height: 1;
  letter-spacing: -0.04em;
}

.subtitle {
  margin-top: 5px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 650;
}

.icon-button {
  display: grid;
  width: 43px;
  height: 43px;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: 13px;
  background: var(--surface);
  cursor: pointer;
  font-size: 26px;
  line-height: 1;
}

.icon-button:focus-visible,
.button:focus-visible,
.copy-button:focus-visible,
textarea:focus-visible {
  outline: 4px solid var(--focus);
  outline-offset: 2px;
}

.messages {
  min-height: 0;
  min-width: 0;
  overflow-y: auto;
  padding: 4px 2px 22px;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.empty-state {
  display: grid;
  min-height: 100%;
  place-content: center;
  justify-items: center;
  padding: 32px 20px;
  text-align: center;
}

.empty-state h2 {
  font-size: 20px;
}

.empty-state p {
  max-width: 430px;
  margin-top: 9px;
  color: var(--muted);
  line-height: 1.45;
}

.empty-mark {
  display: grid;
  width: 54px;
  height: 54px;
  margin-bottom: 16px;
  place-items: center;
  border: 1px solid color-mix(in srgb, var(--accent) 40%, var(--border));
  border-radius: 17px;
  background: color-mix(in srgb, var(--accent) 13%, var(--surface));
  color: var(--accent);
  font-size: 32px;
}

.message {
  width: min(96%, 1400px);
  min-width: 0;
  max-width: 100%;
  margin-top: 12px;
  padding: 14px 15px;
  border: 1px solid var(--border);
  border-radius: 17px;
  background: var(--surface);
  box-shadow: 0 7px 24px rgb(0 0 0 / 7%);
}

.message-user {
  width: min(88%, 1000px);
  margin-left: auto;
  border-color: color-mix(in srgb, var(--accent) 30%, var(--border));
  background: color-mix(in srgb, var(--accent) 16%, var(--surface));
}

.message-assistant {
  margin-right: auto;
}

.message-streaming {
  border-color: color-mix(in srgb, var(--accent) 42%, var(--border));
}

.message-header,
.composer-footer,
.composer-actions {
  display: flex;
  align-items: center;
}

.message-header,
.composer-footer {
  justify-content: space-between;
  gap: 12px;
}

.message-author {
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.message-user .message-author {
  color: var(--link);
}

.copy-button {
  padding: 4px 8px;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 12px;
}

.message-content {
  margin-top: 9px;
  overflow-wrap: anywhere;
  line-height: 1.58;
}

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

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

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

.message-content h1,
.message-content h2,
.message-content h3,
.message-content h4 {
  margin: 1.15em 0 0.45em;
  line-height: 1.28;
}

.message-content h1 { font-size: 1.3rem; }
.message-content h2 { font-size: 1.18rem; }
.message-content h3 { font-size: 1.08rem; }
.message-content h4 { font-size: 1rem; }

.message-content p,
.message-content ul,
.message-content ol,
.message-content pre,
.message-content blockquote,
.message-content table {
  margin: 0.75em 0;
}

.message-content ul,
.message-content ol {
  padding-inline-start: 1.45em;
}

.message-content li + li {
  margin-top: 0.28em;
}

.message-content a {
  color: var(--link);
  text-underline-offset: 0.15em;
}

.message-content blockquote {
  padding: 0.15em 0 0.15em 0.85em;
  border-left: 3px solid color-mix(in srgb, var(--accent) 55%, var(--border));
  color: var(--muted);
}

.message-content code {
  padding: 0.12em 0.32em;
  border-radius: 6px;
  background: color-mix(in srgb, var(--muted) 14%, transparent);
  font-family: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
  font-size: 0.9em;
}

.message-content pre {
  max-width: 100%;
  overflow-x: auto;
  padding: 13px 14px;
  border: 1px solid var(--border);
  border-radius: 11px;
  background: color-mix(in srgb, var(--muted) 10%, var(--page-bg));
  white-space: pre;
  -webkit-overflow-scrolling: touch;
}

.message-content pre code {
  padding: 0;
  background: transparent;
  font-size: 0.86em;
}

.message-content table {
  display: block;
  max-width: 100%;
  overflow-x: auto;
  border-collapse: collapse;
}

.message-content th,
.message-content td {
  padding: 8px 10px;
  border: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}

.message-content th {
  background: color-mix(in srgb, var(--muted) 10%, transparent);
}

.composer-shell {
  position: sticky;
  bottom: 0;
  min-width: 0;
  padding-top: 8px;
  background: linear-gradient(to bottom, transparent, var(--page-bg) 14px);
}

.composer {
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--surface);
  box-shadow: 0 9px 30px rgb(0 0 0 / 14%);
}

textarea {
  display: block;
  width: 100%;
  min-height: 76px;
  max-height: 220px;
  resize: vertical;
  padding: 11px 12px;
  border: 1px solid transparent;
  border-radius: 12px;
  outline: none;
  background: var(--surface-strong);
  color: var(--text);
  line-height: 1.45;
}

textarea::placeholder {
  color: var(--muted);
}

textarea:disabled {
  opacity: 0.72;
}

.composer-footer {
  margin-top: 9px;
}

.composer-actions {
  justify-content: flex-end;
  gap: 8px;
}

.character-count,
.status {
  color: var(--muted);
  font-size: 12px;
}

.status,
.error-message {
  margin: 0 3px 8px;
}

.error-message {
  padding: 10px 12px;
  border: 1px solid color-mix(in srgb, var(--danger) 40%, transparent);
  border-radius: 11px;
  background: color-mix(in srgb, var(--danger) 10%, var(--surface));
  color: var(--danger);
  font-size: 13px;
  line-height: 1.4;
}

.button {
  min-height: 44px;
  padding: 10px 15px;
  border: 0;
  border-radius: 12px;
  cursor: pointer;
  font-weight: 780;
  touch-action: manipulation;
}

.button:active:not(:disabled),
.icon-button:active:not(:disabled) {
  transform: scale(0.98);
}

.button:disabled,
.icon-button:disabled {
  cursor: wait;
  opacity: 0.58;
}

.button-primary {
  min-width: 112px;
  background: var(--accent);
  color: var(--accent-text);
}

.button-stop {
  min-width: 104px;
  border: 1px solid color-mix(in srgb, var(--danger) 55%, var(--border));
  background: color-mix(in srgb, var(--danger) 12%, var(--surface));
  color: var(--danger);
}

.button-danger {
  border: 1px solid color-mix(in srgb, var(--danger) 55%, var(--border));
  background: color-mix(in srgb, var(--danger) 12%, var(--surface));
  color: var(--danger);
}

.chat-drawer-layer {
  position: fixed;
  z-index: 20;
  inset: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
}

.chat-drawer-backdrop {
  position: absolute;
  z-index: 0;
  inset: 0;
  border: 0;
  background: rgb(0 0 0 / 48%);
  cursor: default;
}

.chat-drawer {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-rows: auto auto minmax(0, 1fr) auto;
  grid-column: 2;
  width: min(88vw, 390px);
  height: 100%;
  min-width: 0;
  padding: max(16px, env(safe-area-inset-top)) max(14px, env(safe-area-inset-right))
    max(16px, env(safe-area-inset-bottom)) 14px;
  border-left: 1px solid var(--border);
  background: var(--page-bg);
  box-shadow: -18px 0 46px rgb(0 0 0 / 26%);
}

.chat-drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.chat-drawer-header h2 {
  font-size: 22px;
}

.icon-button-compact {
  width: 38px;
  height: 38px;
  border-radius: 11px;
  font-size: 24px;
}

.drawer-new-chat {
  width: 100%;
  margin-bottom: 12px;
}

.chat-list {
  min-height: 0;
  overflow-y: auto;
  padding: 2px 1px 12px;
  scrollbar-width: thin;
}

.chat-list-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  width: 100%;
  margin-bottom: 7px;
  padding: 11px 12px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  text-align: left;
}

.chat-list-item:hover,
.chat-list-item:focus-visible {
  border-color: color-mix(in srgb, var(--accent) 45%, var(--border));
}

.chat-list-item-active {
  border-color: color-mix(in srgb, var(--accent) 62%, var(--border));
  background: color-mix(in srgb, var(--accent) 12%, var(--surface));
}

.chat-list-title {
  overflow: hidden;
  font-weight: 760;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.chat-list-meta {
  grid-column: 1 / -1;
  margin-top: 4px;
  color: var(--muted);
  font-size: 11px;
}

.chat-list-mark {
  color: var(--accent);
  font-weight: 900;
}

.stream-cursor::after {
  content: "";
  display: inline-block;
  width: 7px;
  height: 1.05em;
  margin-left: 4px;
  border-radius: 2px;
  background: var(--accent);
  vertical-align: -0.16em;
  animation: blink 800ms steps(1) infinite;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

[hidden] {
  display: none !important;
}

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

@media (min-width: 680px) {
  .app-shell {
    padding-right: clamp(20px, 2.4vw, 42px);
    padding-left: clamp(20px, 2.4vw, 42px);
  }

  .message,
  .composer {
    padding: 17px 18px;
  }
}

@media (max-width: 520px) {
  .composer-footer {
    align-items: flex-end;
    flex-wrap: wrap;
  }

  .message,
  .message-user {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}