/* SPDX-License-Identifier: Apache-2.0 */
/* Apertus demo — chat, composer, attachments, and notices.
 * Demo-scoped styling only: tokens and primitives come from ../src/styles/.
 * Contrast notes follow the design system's verified pairs. */

/* --------------------------------------------------------------------------
   Intro band — pale technical panel (Apertus surface role)
   -------------------------------------------------------------------------- */
.demo-intro {
  background-color: var(--md-sys-color-surface-technical);
  border-block-end: 1px solid var(--md-sys-color-outline-variant);
  padding-block: var(--space-48) var(--space-48);
}

.demo-intro .lead-text {
  max-width: 720px;
  margin-block-end: 0;
}

.hidden {
  display: none !important;
}

/* --------------------------------------------------------------------------
   Status chip — mono, uppercase, technical (header)
   -------------------------------------------------------------------------- */
.status-chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-8);
  padding: var(--space-4) var(--space-12);
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: var(--radius-sm);
  background-color: var(--md-sys-color-surface-container-lowest);
  font-family: var(--md-ref-typeface-mono);
  font-size: var(--md-sys-typescale-mono-small-size);
  font-weight: var(--md-sys-typescale-mono-small-weight);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--md-sys-color-on-surface-variant);
  margin: 0;
  white-space: nowrap;
}

.status-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--md-sys-color-outline);
  flex-shrink: 0;
}

.status-chip[data-state="checking"] .status-dot {
  animation: status-pulse 1.2s ease-in-out infinite;
}

.status-chip[data-state="ready"] .status-dot {
  background-color: var(--md-sys-color-secondary); /* Apertus sky */
}

.status-chip[data-state="error"] .status-dot {
  background-color: var(--md-sys-color-error);
}

@keyframes status-pulse {
  0%,
  100% {
    opacity: 0.4;
  }
  50% {
    opacity: 1;
  }
}

/* --------------------------------------------------------------------------
   Chat section and log
   -------------------------------------------------------------------------- */
.chat-section {
  padding-block: var(--space-48) var(--space-64);
}

.chat-shell {
  max-width: 880px;
  margin-inline: auto;
  padding-inline: var(--space-24);
  display: grid;
  gap: var(--space-24);
}

.chat-log {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-24);
}

/* Empty state — hexagonal technical emblem on a pale wash */
.chat-empty {
  display: grid;
  justify-items: center;
  gap: var(--space-12);
  text-align: center;
  padding: var(--space-48);
  background-color: var(--md-sys-color-surface-technical-wash);
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: var(--radius-default);
}

.chat-empty-title {
  font-family: var(--md-ref-typeface-brand);
  font-weight: var(--md-ref-weight-black);
  font-size: var(--md-sys-typescale-title-small-size);
  margin: 0;
}

.chat-empty .mono-caption {
  margin-block-end: 0;
}

.empty-emblem {
  width: 72px;
  height: 72px;
  color: var(--md-sys-color-secondary);
}

.sample-prompts {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-8);
  opacity: 0.7;
}

/* --------------------------------------------------------------------------
   Messages
   User bubbles wear the Apertus sky surface with anthracite text (6.3:1);
   assistant bubbles stay paper-white with a subtle technical border.
   -------------------------------------------------------------------------- */
.message {
  display: grid;
  gap: var(--space-8);
  max-width: 76ch;
}

.message--user {
  margin-inline-start: auto;
  justify-items: end;
}

.message--assistant {
  margin-inline-end: auto;
}

.message--error {
  max-width: 100%;
}

.message-role {
  font-family: var(--md-ref-typeface-mono);
  font-size: var(--md-sys-typescale-mono-small-size);
  font-weight: var(--md-sys-typescale-mono-small-weight);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--md-sys-color-on-surface-variant);
}

.message-bubble {
  padding: var(--space-16) var(--space-24);
  border-radius: var(--radius-default);
  overflow-wrap: break-word;
  width: fit-content;
  max-width: 100%;
}

.message--user .message-bubble {
  background-color: var(--md-sys-color-secondary);
  color: var(--md-sys-color-on-secondary);
}

.message--assistant .message-bubble {
  background-color: var(--md-sys-color-surface-container-lowest);
  border: 1px solid var(--md-sys-color-outline-variant);
  color: var(--md-sys-color-on-surface);
}

.message--error .message-bubble {
  background-color: var(--md-sys-color-error-container);
  border: 1px solid rgba(179, 38, 30, 0.45);
  color: var(--md-sys-color-on-error-container);
  width: auto;
}

.message-bubble p {
  margin: 0 0 var(--space-8);
}

.message-bubble p:last-child {
  margin-block-end: 0;
}

.message-bubble code {
  font-family: var(--md-ref-typeface-mono);
  font-size: 0.9em;
  background-color: var(--md-sys-color-surface-container-low);
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: var(--radius-sm);
  padding: 1px 5px;
}

.message-bubble strong {
  font-weight: var(--md-ref-weight-bold);
}

/* Streaming caret — subtle, disabled under reduced motion */
.message-bubble.is-streaming::after {
  content: "▍";
  margin-inline-start: 2px;
  animation: caret-blink 1s steps(1) infinite;
}

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

/* Attachments inside messages */
.message-attachments {
  display: grid;
  gap: var(--space-8);
  justify-items: start;
  margin-block-start: var(--space-8);
}

.message--user .message-attachments {
  justify-items: end;
}

.attachment-image {
  max-width: min(320px, 100%);
  border-radius: var(--radius-sm);
  border: 1px solid rgba(46, 47, 49, 0.16);
}

.message--user .attachment-image {
  border: 2px solid var(--md-sys-color-surface-container-lowest);
}

.attachment-audio {
  min-width: min(280px, 100%);
}

.attachment-audio audio {
  width: 100%;
}

.attachment-caption {
  font-family: var(--md-ref-typeface-mono);
  font-size: var(--md-sys-typescale-mono-small-size);
  color: var(--md-sys-color-on-surface-variant);
  overflow-wrap: anywhere;
}

.message--user .attachment-caption {
  color: var(--md-sys-color-on-secondary);
}

/* Message actions — 44px targets (edit / regenerate a prompt) */
.message-actions {
  display: flex;
  gap: var(--space-8);
}

.message-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
  padding: 0;
  background-color: var(--md-sys-color-surface-container-lowest);
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: var(--radius-sm);
  color: var(--md-sys-color-on-surface);
  cursor: pointer;
  transition:
    background-color var(--duration-fast) var(--ease-standard),
    border-color var(--duration-fast) var(--ease-standard);
}

.message-action:hover {
  background-color: var(--md-sys-color-surface-technical-wash);
  border-color: var(--md-sys-color-outline-blue);
}

.message-action .icon {
  width: 20px;
  height: 20px;
}

/* --------------------------------------------------------------------------
   Composer
   -------------------------------------------------------------------------- */
.composer {
  display: grid;
  gap: var(--space-12);
  padding: var(--space-16);
  background-color: var(--md-sys-color-surface-container-lowest);
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: var(--radius-default);
}

.composer:focus-within {
  border-color: var(--md-sys-color-outline-blue);
}

.composer-row {
  display: grid;
}

#prompt-input {
  font: inherit;
  color: var(--md-sys-color-on-surface);
  background-color: var(--md-sys-color-surface-container-low);
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: var(--radius-sm);
  padding: var(--space-12) var(--space-16);
  width: 100%;
  min-height: 48px;
  max-height: 220px;
  resize: none;
}

#prompt-input::placeholder {
  color: var(--color-text-muted);
}

#prompt-input:focus-visible,
#prompt-input:focus {
  outline: var(--focus-ring);
  outline-offset: var(--focus-ring-offset);
  border-color: var(--md-sys-color-outline-blue);
}

.composer-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-8);
}

.composer-spacer {
  flex: 1;
}

.attach-button .icon {
  width: 20px;
  height: 20px;
  margin-inline-end: var(--space-8);
}

.composer-hint {
  margin: 0;
}

/* Edit bar — regeneration context above the composer */
.edit-bar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-12);
  padding: var(--space-8) var(--space-12);
  background-color: var(--md-sys-color-surface-technical);
  border: 1px solid var(--md-sys-color-outline-blue);
  border-radius: var(--radius-sm);
  font-family: var(--md-ref-typeface-mono);
  font-size: var(--md-sys-typescale-mono-small-size);
  color: var(--md-sys-color-on-surface);
}

/* --------------------------------------------------------------------------
   Attachment tray (pending uploads in the composer)
   -------------------------------------------------------------------------- */
.attachment-tray {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-8);
}

.attachment-chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-8);
  padding: var(--space-4) var(--space-8) var(--space-4) var(--space-4);
  background-color: var(--md-sys-color-surface-container-low);
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: var(--radius-sm);
}

.attachment-chip img {
  width: 40px;
  height: 40px;
  object-fit: cover;
  border-radius: var(--radius-sm);
}

.attachment-chip-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  color: var(--md-sys-color-on-surface-variant);
}

.chip-name {
  font-family: var(--md-ref-typeface-mono);
  font-size: var(--md-sys-typescale-mono-small-size);
  color: var(--md-sys-color-on-surface-variant);
  max-width: 160px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.attachment-remove {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
  margin-inline-end: calc(-1 * var(--space-4));
  padding: 0;
  background: none;
  border: 0;
  border-radius: var(--radius-sm);
  color: var(--md-sys-color-on-surface-variant);
  cursor: pointer;
  transition:
    background-color var(--duration-fast) var(--ease-standard),
    color var(--duration-fast) var(--ease-standard);
}

.attachment-remove:hover {
  background-color: var(--md-sys-color-surface-technical);
  color: var(--md-sys-color-on-surface);
}

.attachment-remove .icon {
  width: 20px;
  height: 20px;
}

/* --------------------------------------------------------------------------
   Notices — info on pale wash, warnings on the error container
   -------------------------------------------------------------------------- */
.notice-region {
  display: grid;
  gap: var(--space-8);
}

.notice {
  display: flex;
  align-items: flex-start;
  gap: var(--space-12);
  padding: var(--space-12) var(--space-16);
  border-radius: var(--radius-sm);
  font-size: var(--md-sys-typescale-body-small-size);
}

.notice-text {
  margin: 0;
}

.notice--info {
  background-color: var(--md-sys-color-surface-technical-wash);
  border: 1px solid var(--md-sys-color-outline-blue);
  color: var(--md-sys-color-on-surface);
}

.notice--warn {
  background-color: var(--md-sys-color-error-container);
  border: 1px solid rgba(179, 38, 30, 0.45);
  color: var(--md-sys-color-on-error-container);
}

.notice-dismiss {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
  margin: -12px;
  padding: 0;
  background: none;
  border: 0;
  border-radius: var(--radius-sm);
  color: inherit;
  cursor: pointer;
  flex-shrink: 0;
}

.notice-dismiss:hover {
  background-image: linear-gradient(rgba(46, 47, 49, 0.08), rgba(46, 47, 49, 0.08));
}

.notice-dismiss .icon {
  width: 20px;
  height: 20px;
}

/* --------------------------------------------------------------------------
   Reduced motion — disable the pulse and caret animations
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  .status-chip[data-state="checking"] .status-dot {
    animation: none;
    opacity: 0.6;
  }

  .message-bubble.is-streaming::after {
    animation: none;
    opacity: 0.6;
  }
}

/* --------------------------------------------------------------------------
   Small screens — keep the shell inside 320px viewports
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
  .chat-shell {
    padding-inline: var(--space-16);
  }

  .chat-empty {
    padding: var(--space-24);
  }

  .message-bubble {
    padding: var(--space-12) var(--space-16);
  }

  .message {
    max-width: 100%;
  }
}