:root {
  color-scheme: light;
  --blue: oklch(58% 0.2 257);
  --blue-deep: oklch(50% 0.18 257);
  --blue-soft: oklch(95% 0.025 257);
  --teal: oklch(67% 0.12 177);
  --ink: oklch(28% 0.06 250);
  --slate: oklch(48% 0.045 250);
  --muted: oklch(62% 0.025 250);
  --canvas: oklch(97% 0.012 250);
  --surface: oklch(99% 0.005 250);
  --line: oklch(90% 0.025 250);
  --danger: oklch(43% 0.16 15);
  --danger-soft: oklch(96% 0.025 15);
  --success-soft: oklch(95% 0.03 177);
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  font-family: "IBM Plex Sans", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
}

button,
textarea {
  font: inherit;
}

button {
  min-height: 44px;
}

button:focus-visible,
textarea:focus-visible {
  outline: 3px solid color-mix(in oklch, var(--blue) 24%, transparent);
  outline-offset: 2px;
}

.app-shell {
  min-height: 100vh;
  padding: 0;
}

.chat {
  display: grid;
  grid-template-rows: auto minmax(100px, 1fr) auto auto auto;
  width: 100%;
  min-height: 100vh;
  background: var(--surface);
}

.chat-header,
.conversation,
.summary,
.composer,
.terminal-action,
.status-message {
  width: min(100%, 760px);
  margin-inline: auto;
}

.chat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px;
  border-bottom: 1px solid var(--line);
}

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

.brand-lockup img {
  display: block;
  width: 152px;
  height: auto;
}

.reset-button {
  padding: 8px;
  border: 0;
  background: transparent;
  color: var(--slate);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
}

.reset-button:hover {
  color: var(--blue);
}

.eyebrow {
  margin: 0 0 4px;
  color: var(--blue);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h2 {
  margin: 0;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 1.125rem;
}

.conversation {
  display: flex;
  flex-direction: column;
  gap: 12px;
  overflow-y: auto;
  padding: 22px 16px 28px;
  scroll-behavior: smooth;
}

.message {
  max-width: min(88%, 620px);
  padding: 12px 14px;
  border-radius: 16px;
  font-size: 1rem;
  line-height: 1.5;
  white-space: pre-wrap;
}

.message-assistant {
  align-self: flex-start;
  border: 1px solid var(--line);
  border-bottom-left-radius: 5px;
  background: var(--surface);
}

.message-user {
  align-self: flex-end;
  border-bottom-right-radius: 5px;
  background: var(--blue-soft);
  color: var(--ink);
}

.message-system {
  align-self: stretch;
  max-width: 100%;
  padding: 10px 12px;
  border-radius: 10px;
  background: var(--danger-soft);
  color: var(--danger);
  font-size: 0.875rem;
  font-weight: 600;
  text-align: center;
}

.summary {
  margin-bottom: 16px;
  padding: 18px 16px;
  border-block: 1px solid var(--line);
  background: var(--canvas);
}

.summary-heading {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 16px;
}

.summary-heading > span {
  color: var(--slate);
  font-size: 0.75rem;
  font-weight: 600;
}

.summary dl {
  display: grid;
  grid-template-columns: minmax(108px, 0.4fr) 1fr;
  gap: 10px 14px;
  margin: 18px 0;
}

.summary dt {
  color: var(--slate);
  font-size: 0.875rem;
  font-weight: 600;
}

.summary dd {
  margin: 0;
  overflow-wrap: anywhere;
}

.confirmation-actions {
  display: grid;
  gap: 10px;
}

.primary-button,
.secondary-button {
  border-radius: 10px;
  padding: 12px 18px;
  font-weight: 700;
  cursor: pointer;
  transition: background-color 180ms var(--ease-out), color 180ms var(--ease-out);
}

.primary-button {
  border: 1px solid var(--blue);
  background: var(--blue);
  color: var(--surface);
}

.primary-button:hover {
  border-color: var(--blue-deep);
  background: var(--blue-deep);
}

.secondary-button {
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
}

.secondary-button:hover {
  border-color: var(--blue);
  color: var(--blue);
}

.composer {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  padding: 12px 16px 16px;
  border-top: 1px solid var(--line);
  background: var(--surface);
}

.composer textarea {
  width: 100%;
  min-height: 48px;
  max-height: 144px;
  resize: none;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
  color: var(--ink);
  font-size: 16px;
  line-height: 1.4;
}

.composer textarea:focus {
  border-color: var(--blue);
}

.send-button {
  display: grid;
  width: 48px;
  height: 48px;
  place-items: center;
  border: 0;
  border-radius: 10px;
  background: var(--blue);
  color: var(--surface);
  cursor: pointer;
}

.send-button:hover {
  background: var(--blue-deep);
}

.send-button:disabled,
.primary-button:disabled,
.secondary-button:disabled {
  cursor: wait;
  opacity: 0.58;
}

.send-button svg {
  width: 22px;
  fill: currentColor;
}

.terminal-action {
  padding: 14px 16px 18px;
  border-top: 1px solid var(--line);
  text-align: center;
}

.status-message {
  min-height: 20px;
  margin-block: 0;
  padding: 0 16px 12px;
  color: var(--danger);
  font-size: 0.875rem;
  text-align: center;
}

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

[hidden] {
  display: none !important;
}

@media (min-width: 760px) {
  .app-shell {
    display: grid;
    place-items: center;
    padding: 32px;
  }

  .chat {
    width: min(100%, 460px);
    min-height: min(700px, calc(100vh - 64px));
    max-height: 760px;
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: 0 20px 60px color-mix(in oklch, var(--ink) 10%, transparent);
    overflow: hidden;
  }

  .chat-header,
  .conversation,
  .summary,
  .composer,
  .terminal-action,
  .status-message {
    width: 100%;
  }

  .chat-header,
  .conversation,
  .composer,
  .terminal-action {
    padding-inline: 24px;
  }

  .summary {
    margin-inline: 24px;
    width: auto;
    border: 1px solid var(--line);
    border-radius: 16px;
    padding: 20px;
  }

  .confirmation-actions {
    grid-template-columns: 1fr auto;
  }
}

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