:root {
  color-scheme: dark;
  --background: #111827;
  --surface: #1f2937;
  --text: #e5e7eb;
  --muted: #9ca3af;
  --user: #1d4ed8;
  --control-background: #e5e7eb;
  --control-text: #111827;
  --danger: #fecaca;
  --focus: #fbbf24;
}

* { box-sizing: border-box; }

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

body { color: var(--text); font: 16px system-ui; }

main {
  position: fixed;
  top: var(--visual-viewport-top, 0px);
  left: 50%;
  width: min(100%, 720px);
  height: var(--visual-viewport-height, 100dvh);
  min-width: 0;
  padding:
    calc(16px + env(safe-area-inset-top))
    calc(16px + env(safe-area-inset-right))
    calc(16px + env(safe-area-inset-bottom))
    calc(16px + env(safe-area-inset-left));
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  gap: 12px;
  overflow: hidden;
}

header, #composer, .configuration-actions { display: flex; gap: 8px; }
header { align-items: center; flex: 0 0 auto; min-width: 0; }
h1 { margin: 0; font-size: 18px; flex: 1; min-width: 0; }
h2 { margin: 0 0 16px; font-size: 20px; }

button, input, select, textarea {
  min-height: 44px;
  border: 0;
  border-radius: 8px;
  padding: 10px;
  font: inherit;
}

input, select, textarea {
  width: 100%;
  min-width: 0;
  color: var(--control-text);
  background: white;
}

button {
  color: var(--control-text);
  background: var(--control-background);
  white-space: nowrap;
}

button:disabled, input:disabled, select:disabled, textarea:disabled { opacity: .5; }

:where(button, input, select, textarea, [tabindex]):focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

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

#focus-dialog {
  position: fixed;
  top: var(--visual-viewport-top, 0px);
  right: 0;
  left: 0;
  width: 100%;
  height: var(--visual-viewport-height, 100dvh);
  max-width: none;
  max-height: none;
  margin: 0;
  padding: calc(16px + env(safe-area-inset-top)) calc(16px + env(safe-area-inset-right))
    calc(16px + env(safe-area-inset-bottom)) calc(16px + env(safe-area-inset-left));
  border: 0;
  overflow: auto;
  color: var(--text);
  background: transparent;
  place-items: center;
}
#focus-dialog[open] { display: grid; }
#focus-dialog:not([open]) { display: none; }
#focus-dialog::backdrop {
  background-color: rgb(0 0 0 / 0);
  transition: background-color 180ms ease;
}
#focus-dialog[open]::backdrop { background-color: rgb(0 0 0 / .92); }
#focus-dialog > section {
  width: min(100%, 640px);
  max-height: calc(var(--visual-viewport-height, 100dvh) - 32px - env(safe-area-inset-top) - env(safe-area-inset-bottom));
  min-width: 0;
  overflow: auto;
  padding: 16px;
  border-radius: 10px;
  background: var(--surface);
}
#focus-dialog > section[hidden] { display: none; }
#resume-picker { min-height: 0; }

#pre-turn-configuration {
  flex: 0 0 auto;
  padding: 10px 12px;
  border-radius: 8px;
  color: var(--muted);
  background: var(--surface);
}

.client-operation-status {
  flex: 0 0 auto;
  padding: 10px 12px;
  border: 1px solid #374151;
  border-radius: 8px;
  background: var(--surface);
  color: var(--muted);
}
.client-operation-status[hidden] { display: none; }
.client-operation-status button { margin-left: 8px; }
.resume-heading-row { display: flex; align-items: center; gap: 8px; }
.resume-heading-row h2 { flex: 1; margin: 0; }
#resume-status { color: var(--muted); }
#resume-error { padding: 10px; border: 1px solid var(--danger); border-radius: 8px; color: var(--danger); }
#resume-error[hidden], #load-more-threads[hidden], #load-older-history[hidden] { display: none; }
#resume-results { display: grid; gap: 8px; }
.resume-row { width: 100%; display: grid; gap: 3px; text-align: left; white-space: normal; }
.resume-title { font-weight: 700; }
.resume-preview, .resume-meta { color: #374151; font-size: 14px; overflow-wrap: anywhere; }
#load-more-threads { width: 100%; margin-top: 8px; }
#load-older-history { width: 100%; margin-bottom: 8px; }
.history-error { margin-bottom: 8px; padding: 10px; border: 1px solid var(--danger); border-radius: 8px; color: var(--danger); }
.history-error[hidden] { display: none; }
.turn-failure-feedback { margin: 8px 0; padding: 10px; border: 1px solid var(--danger); border-radius: 8px; color: var(--danger); }

.failure-feedback, .message.error, #settings-error, #configuration-error, #resume-error, .history-error { overflow-wrap: anywhere; }
.failure-action, .failure-copy { display: block; margin-top: 8px; max-width: 100%; white-space: normal; }
.device-auth-card { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 8px; margin-top: 10px; padding-top: 10px; border-top: 1px solid currentColor; }
.device-auth-progress { grid-column: 1 / -1; margin: 0; }
.device-auth-card a, .device-auth-card code, .device-auth-card button { min-height: 44px; display: flex; align-items: center; overflow-wrap: anywhere; white-space: normal; }
.device-auth-card a { grid-column: 1 / -1; }
.device-auth-card code { padding: 8px; font-size: 1rem; }
.failure-feedback details, .message.error details, #settings-error details, #configuration-error details, #resume-error details, .history-error details { margin-top: 8px; color: var(--muted); }
.failure-feedback summary, .message.error summary, #settings-error summary, #configuration-error summary, #resume-error summary, .history-error summary { cursor: pointer; }

.configuration-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.field { display: grid; gap: 6px; min-width: 0; }
.field-token { grid-column: 1 / -1; }
.field-hint { color: var(--muted); font-size: 14px; }
.field-hint[hidden] { display: none; }
.field-error { min-height: 1em; color: var(--danger); font-size: 14px; }

#configuration-error, #settings-error {
  margin: 0 0 12px;
  padding: 10px;
  border: 1px solid var(--danger);
  border-radius: 8px;
  color: var(--danger);
}

#configuration-error[hidden], #configuration-progress[hidden], #settings-error[hidden], #settings-progress[hidden] { display: none; }
#configuration-progress, #settings-progress { margin: 12px 0 0; color: var(--muted); }
.configuration-actions { justify-content: flex-end; margin-top: 16px; }

@media (prefers-reduced-motion: reduce) {
  #focus-dialog::backdrop { transition: none; }
}

#messages {
  flex: 1 1 auto;
  min-width: 0;
  min-height: 0;
  overflow-x: hidden;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-gutter: stable;
}

.message, .message * { min-width: 0; max-width: 100%; }

.message {
  padding: 12px;
  margin: 8px 0;
  border-radius: 10px;
  overflow-wrap: anywhere;
  white-space: pre-wrap;
  background: var(--surface);
}

.message:first-child { margin-top: 0; }
.message:last-child { margin-bottom: 0; }
.message.user { background: var(--user); }
.message.error { border-inline-start: 3px solid var(--danger); }
.message-metadata { display: block; margin-top: 6px; color: var(--muted); font-size: .75rem; }
.message.relay, .activity, .transient-status, .status-snapshot {
  border: 1px dotted currentColor;
  color: var(--muted);
  background: transparent;
}
.activity-decoration { display: inline-block; letter-spacing: .2em; animation: activity-pulse 1.2s ease-in-out infinite; }

@keyframes activity-pulse {
  0%, 100% { opacity: .35; }
  50% { opacity: 1; }
}

.message pre {
  max-width: 100%;
  margin: 8px 0;
  padding: 10px;
  overflow-x: auto;
  overscroll-behavior-inline: contain;
  -webkit-overflow-scrolling: touch;
  border-radius: 6px;
  background: #030712;
  white-space: pre;
}

.message code { white-space: inherit; }

#status {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  flex: 0 0 auto;
  min-width: 0;
  min-height: 1.2em;
  overflow-wrap: anywhere;
  color: var(--muted);
}
.status-details { flex: 1 1 auto; min-width: 0; }
.status-warning { color: var(--danger); }
.status-retry { flex: 0 0 auto; min-height: 44px; }
#shutdown-status { flex: 0 0 auto; min-width: 0; overflow-wrap: anywhere; color: var(--muted); }
#shutdown-status.status-warning { color: var(--danger); }
#shutdown-status > button { margin-left: 8px; }

#composer { flex: 0 0 auto; align-items: flex-end; min-width: 0; }
#turn-control-error { flex: 1 0 100%; }
#session-actions { flex: 0 0 44px; }
#focus-dialog > #session-menu, #focus-dialog > #turn-actions { width: min(100%, 360px); padding: 10px; }
#session-menu button, #turn-actions button { display: block; width: 100%; min-height: 54px; padding: 14px 16px; text-align: left; color: var(--text); background: transparent; }
#session-menu button[hidden] { display: none; }
#session-menu button + button, #turn-actions button + button { border-top: 1px solid #374151; border-radius: 0; }
#session-menu button:hover:not(:disabled), #session-menu button:focus-visible, #turn-actions button:hover:not(:disabled), #turn-actions button:focus-visible { background: #374151; }
#session-menu button span, #turn-actions button span { display: block; margin-top: 4px; color: var(--muted); font-size: 13px; white-space: normal; }
#settings #stop-session { color: #7f1d1d; background: #fecaca; }
#settings #stop-session span { color: #7f1d1d; }
#settings .configuration-actions { flex-direction: column; }
#settings .configuration-actions button { width: 100%; }
#turn-actions #turn-action-stop { color: var(--danger); }
.session-start { align-self: center; width: min(100%, 32rem); margin: auto; padding: 24px; text-align: center; border: 1px solid #374151; border-radius: 14px; background: var(--surface); }
.session-start h2 { margin-top: 0; }
.session-start button { min-height: 48px; min-width: min(100%, 220px); }
body:has(#session-start:not([hidden])) #messages,
body:has(#session-start:not([hidden])) #client-operation-status,
body:has(#session-start:not([hidden])) #pre-turn-configuration { display: none; }

#prompt {
  flex: 1 1 auto;
  min-height: 46px;
  height: 46px;
  resize: none;
  overflow-y: hidden;
}

#send { flex: 0 0 auto; min-height: 44px; }
#send.turn-stop { color: var(--danger); border: 1px solid var(--danger); background: transparent; }

#terminal-view { flex: 1 1 auto; min-height: 0; display: flex; flex-direction: column; gap: 8px; }
#terminal-view[hidden], #messages[hidden] { display: none; }
#terminal-feedback { flex: 0 0 auto; margin: 0; color: var(--muted); font-size: 13px; }
#terminal-screen { flex: 1 1 auto; min-height: 0; overflow: auto; padding: 10px; border-radius: 8px; background: #030712; }
#terminal-screen .xterm { height: 100%; }
#terminal-screen .xterm-viewport { overflow-x: auto; }
#terminal-live { align-self: flex-end; }
#terminal-keys { min-width: 0; }
#terminal-key-strip { display: flex; width: 100%; gap: 6px; overflow-x: auto; overscroll-behavior-x: contain; scrollbar-width: thin; -webkit-overflow-scrolling: touch; }
#terminal-key-strip button { flex: 0 0 auto; min-height: 44px; min-width: 44px; padding: 8px 10px; }
#session-menu-trigger-terminal[hidden] { display: none; }
#mode-dialog { width: min(calc(100% - 32px), 360px); margin: auto; border: 0; border-radius: 10px; background: var(--surface); color: var(--text); }
#mode-dialog::backdrop { background: #000e; }
#mode-dialog button { display: block; width: 100%; margin-top: 8px; text-align: left; }
body.terminal-mode #pre-turn-configuration, body.terminal-mode #client-operation-status, body.terminal-mode #status, body.terminal-mode #shutdown-status, body.terminal-mode #new, body.terminal-mode #resume, body.terminal-mode #configure, body.terminal-mode #session-actions { display: none; }

.icon-button {
  display: inline-grid;
  place-items: center;
  flex: 0 0 44px;
  width: 44px;
  min-width: 44px;
  height: 44px;
  padding: 0;
}

.header-action-inverted {
  color: var(--text);
  background: transparent;
}

#mode-trigger {
  flex: 0 0 auto;
  min-width: 96px;
  border: 1px solid #93c5fd;
  color: #eff6ff;
  background: #1d4ed8;
  font-weight: 700;
  box-shadow: 0 2px 8px rgb(0 0 0 / .25);
}

@media (max-width: 599px) {
  main { gap: 8px; }
  .configuration-grid { grid-template-columns: minmax(0, 1fr); }
  .field-token { grid-column: auto; }
  .configuration-actions { flex-direction: column-reverse; }
  #settings .configuration-actions { flex-direction: column; }
  .configuration-actions button { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; }
  .activity-decoration { animation: none; }
}