:root {
  color-scheme: light;
  --cp-bg: #f7f4ef;
  --cp-bg-elevated: #fcfbf8;
  --cp-surface: #ffffff;
  --cp-surface-soft: #f5f5f5;
  --cp-border: #dedede;
  --cp-border-strong: #919191;
  --cp-text: #242424;
  --cp-text-muted: #5c5c5c;
  --cp-text-soft: #6f6f6f;
  --cp-accent: #b11f4b;
  --cp-accent-hover: #9a1a41;
  --cp-accent-soft: rgba(177, 31, 75, 0.08);
  --cp-accent-fg: #ffffff;
  --cp-success: #16a34a;
  --cp-danger: #dc2626;
  --cp-warning: #f59e0b;
  --cp-link: #0078d4;
  --cp-shadow: 0 18px 48px rgba(0, 0, 0, 0.12);
  --cp-overlay: rgba(255, 255, 255, 0.8);
  --cp-panel: rgba(255, 255, 255, 0.86);
  --cp-panel-strong: rgba(255, 255, 255, 0.96);
  --cp-sheen: rgba(255, 255, 255, 0.55);
  --cp-highlight: rgba(177, 31, 75, 0.12);
}

html[data-theme="dark"] {
  color-scheme: dark;
  --cp-bg: #3d3b3a;
  --cp-bg-elevated: #343231;
  --cp-surface: #292929;
  --cp-surface-soft: #2e2e2e;
  --cp-border: #474747;
  --cp-border-strong: #5f5f5f;
  --cp-text: #dedede;
  --cp-text-muted: #919191;
  --cp-text-soft: #b0b0b0;
  --cp-accent: #fd8ea1;
  --cp-accent-hover: #fb7b91;
  --cp-accent-soft: rgba(253, 142, 161, 0.14);
  --cp-accent-fg: #1a1a1a;
  --cp-success: #4ade80;
  --cp-danger: #f87171;
  --cp-warning: #fbbf24;
  --cp-link: #4da6ff;
  --cp-shadow: 0 18px 48px rgba(0, 0, 0, 0.32);
  --cp-overlay: rgba(41, 41, 41, 0.88);
  --cp-panel: rgba(41, 41, 41, 0.72);
  --cp-panel-strong: rgba(41, 41, 41, 0.96);
  --cp-sheen: rgba(255, 255, 255, 0.04);
  --cp-highlight: rgba(253, 142, 161, 0.12);
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
  margin: 0;
}

body {
  overflow: hidden;
  background: var(--cp-bg);
  color: var(--cp-text);
  font-family: "Segoe UI", Aptos, Calibri, -apple-system, BlinkMacSystemFont, sans-serif;
  letter-spacing: 0;
}

button,
input,
textarea {
  color: inherit;
  font: inherit;
  letter-spacing: 0;
}

button {
  cursor: pointer;
}

button:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--cp-accent);
  outline-offset: 2px;
}

.app-shell {
  display: grid;
  grid-template-columns: 19rem minmax(0, 1fr);
  height: 100%;
}

.sidebar {
  z-index: 20;
  display: flex;
  min-width: 0;
  flex-direction: column;
  border-right: 1px solid var(--cp-border);
  background: var(--cp-bg);
  padding: 1rem;
}

.brand-row {
  display: grid;
  grid-template-columns: 2.25rem minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.625rem;
  min-height: 2.5rem;
}

.brand-mark,
.empty-mark {
  display: grid;
  place-items: center;
  background: var(--cp-accent);
  color: var(--cp-accent-fg);
}

.brand-mark {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 0.625rem;
}

.brand-mark svg,
.empty-mark svg {
  width: 1.125rem;
  height: 1.125rem;
}

.brand-row strong,
.brand-row span,
.sidebar-footer strong,
.sidebar-footer span {
  display: block;
}

.brand-row strong {
  font-size: 0.9375rem;
}

.brand-row span,
.sidebar-footer span {
  margin-top: 0.125rem;
  color: var(--cp-text-muted);
  font-size: 0.75rem;
}

.icon-button,
.send-button {
  display: grid;
  width: 2.5rem;
  height: 2.5rem;
  flex: 0 0 2.5rem;
  place-items: center;
  border: 1px solid var(--cp-border);
  border-radius: 0.625rem;
  background: var(--cp-surface);
}

.icon-button:hover {
  border-color: var(--cp-border-strong);
  background: var(--cp-surface-soft);
}

.icon-button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

.icon-button svg,
.send-button svg {
  width: 1.125rem;
  height: 1.125rem;
}

.close-sidebar,
.open-sidebar {
  display: none;
}

.danger-button:not(:disabled):hover {
  border-color: var(--cp-danger);
  color: var(--cp-danger);
}

.new-chat-button {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 2.75rem;
  margin: 1.25rem 0;
  border: 0;
  border-radius: 0.625rem;
  background: var(--cp-accent);
  color: var(--cp-accent-fg);
  font-weight: 650;
}

.new-chat-button:hover,
.send-button:hover:not(:disabled) {
  background: var(--cp-accent-hover);
}

.new-chat-button svg {
  width: 1rem;
}

.history-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 0.5rem 0.5rem;
  color: var(--cp-text-muted);
  font-size: 0.75rem;
  font-weight: 650;
  text-transform: uppercase;
}

.conversation-list {
  min-height: 0;
  flex: 1;
  overflow-y: auto;
}

.conversation-item {
  margin-bottom: 0.25rem;
}

.conversation-select {
  display: block;
  width: 100%;
  min-height: 4rem;
  overflow: hidden;
  border: 1px solid transparent;
  border-radius: 0.625rem;
  background: transparent;
  padding: 0.625rem 0.75rem;
  text-align: left;
}

.conversation-select:hover {
  background: var(--cp-surface-soft);
}

.conversation-item.active .conversation-select {
  border-color: var(--cp-border);
  background: var(--cp-surface);
}

.conversation-title,
.conversation-preview {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.conversation-title {
  margin-bottom: 0.25rem;
  font-size: 0.875rem;
  font-weight: 650;
}

.conversation-preview {
  color: var(--cp-text-muted);
  font-size: 0.75rem;
}

.sidebar-footer {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 0.625rem;
  margin-top: 1rem;
  border-top: 1px solid var(--cp-border);
  padding: 1rem 0.5rem 0;
  font-size: 0.8125rem;
}

.status-dot {
  display: inline-block;
  width: 0.5rem;
  height: 0.5rem;
  flex: 0 0 0.5rem;
  border-radius: 50%;
  background: var(--cp-success);
}

.sidebar-scrim {
  display: none;
}

.chat-panel {
  display: grid;
  min-width: 0;
  height: 100%;
  grid-template-rows: auto minmax(0, 1fr) auto;
  background: var(--cp-bg-elevated);
}

.chat-header {
  display: flex;
  min-height: 4.5rem;
  align-items: center;
  gap: 0.75rem;
  border-bottom: 1px solid var(--cp-border);
  background: var(--cp-panel-strong);
  padding: 0.75rem 1.25rem;
}

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

.title-block h1 {
  overflow: hidden;
  margin: 0;
  font-size: 1rem;
  font-weight: 650;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.title-block > span {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  margin-top: 0.25rem;
  color: var(--cp-text-muted);
  font-size: 0.75rem;
}

.header-actions {
  display: flex;
  gap: 0.5rem;
}

.message-region {
  min-height: 0;
  overflow-y: auto;
  scroll-behavior: smooth;
}

.empty-state {
  display: flex;
  width: min(100% - 2rem, 45rem);
  min-height: 100%;
  margin: 0 auto;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 3rem 0 5rem;
  text-align: center;
}

.empty-state.hidden {
  display: none;
}

.empty-mark {
  width: 3rem;
  height: 3rem;
  margin-bottom: 1.25rem;
  border-radius: 0.625rem;
}

.empty-state h2 {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1.75rem, 4vw, 2.375rem);
  font-weight: 500;
}

.empty-state > p {
  max-width: 32rem;
  margin: 0.75rem 0 2rem;
  color: var(--cp-text-muted);
  font-size: 0.9375rem;
  line-height: 1.6;
}

.prompt-grid {
  display: grid;
  width: 100%;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.75rem;
}

.prompt-option {
  display: grid;
  min-height: 7rem;
  grid-template-columns: 1fr auto;
  grid-template-rows: auto 1fr;
  gap: 0.75rem;
  border: 1px solid var(--cp-border);
  border-radius: 0.625rem;
  background: var(--cp-surface);
  padding: 1rem;
  text-align: left;
}

.prompt-option:hover {
  border-color: var(--cp-border-strong);
  background: var(--cp-surface-soft);
}

.prompt-option > svg {
  width: 1.125rem;
  height: 1.125rem;
  color: var(--cp-accent);
}

.prompt-option span {
  align-self: end;
  grid-column: 1 / -1;
  font-size: 0.8125rem;
  font-weight: 650;
  line-height: 1.35;
}

.messages {
  width: min(100%, 52rem);
  margin: 0 auto;
  padding: 2rem 1.5rem 6rem;
}

.message {
  display: grid;
  grid-template-columns: 2rem minmax(0, 1fr);
  gap: 0.875rem;
  margin-bottom: 2rem;
  animation: message-in 180ms ease-out both;
}

.message-avatar {
  display: grid;
  width: 2rem;
  height: 2rem;
  place-items: center;
  border: 1px solid var(--cp-border);
  border-radius: 0.625rem;
  background: var(--cp-surface);
}

.message.user .message-avatar {
  border-color: var(--cp-accent);
  background: var(--cp-accent);
  color: var(--cp-accent-fg);
}

.message-avatar svg {
  width: 1rem;
  height: 1rem;
}

.message-meta {
  margin-bottom: 0.375rem;
  font-size: 0.8125rem;
  font-weight: 650;
}

.message-content {
  overflow-wrap: anywhere;
  color: var(--cp-text);
  font-size: 0.9375rem;
  line-height: 1.7;
  white-space: pre-wrap;
}

.message.pending .message-content {
  color: var(--cp-text-muted);
}

.typing-indicator {
  display: flex;
  gap: 0.25rem;
  padding-top: 0.25rem;
}

.typing-indicator span {
  width: 0.375rem;
  height: 0.375rem;
  border-radius: 50%;
  background: var(--cp-accent);
  animation: typing 900ms infinite alternate;
}

.typing-indicator span:nth-child(2) {
  animation-delay: 180ms;
}

.typing-indicator span:nth-child(3) {
  animation-delay: 360ms;
}

.composer-wrap {
  z-index: 5;
  background: var(--cp-panel-strong);
  padding: 0.75rem max(1rem, calc((100% - 49rem) / 2)) 0.625rem;
}

.composer {
  display: flex;
  align-items: flex-end;
  gap: 0.75rem;
  min-height: 3.75rem;
  border: 1px solid var(--cp-border-strong);
  border-radius: 0.625rem;
  background: var(--cp-surface);
  padding: 0.625rem;
  box-shadow: var(--cp-shadow);
}

.composer:focus-within {
  border-color: var(--cp-accent);
}

.composer textarea {
  min-height: 2.375rem;
  max-height: 11rem;
  flex: 1;
  resize: none;
  border: 0;
  outline: 0;
  background: transparent;
  padding: 0.5rem;
  line-height: 1.45;
}

.composer textarea::placeholder {
  color: var(--cp-text-muted);
}

.send-button {
  border: 0;
  background: var(--cp-accent);
  color: var(--cp-accent-fg);
}

.send-button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

.composer-caption {
  margin: 0.5rem 0 0;
  color: var(--cp-text-muted);
  font-size: 0.6875rem;
  text-align: center;
}

.toast {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  z-index: 50;
  max-width: min(24rem, calc(100vw - 2rem));
  border: 1px solid var(--cp-danger);
  border-radius: 0.625rem;
  background: var(--cp-panel-strong);
  color: var(--cp-text);
  padding: 0.875rem 1rem;
  box-shadow: var(--cp-shadow);
}

.auth-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-items: center;
  background: var(--cp-overlay);
  padding: 1rem;
}

.auth-overlay[hidden] {
  display: none;
}

.auth-dialog {
  display: grid;
  width: min(100%, 25rem);
  gap: 1rem;
  border: 1px solid var(--cp-border);
  border-radius: 0.625rem;
  background: var(--cp-surface);
  padding: 2rem;
  box-shadow: var(--cp-shadow);
}

.auth-mark {
  display: grid;
  width: 2.75rem;
  height: 2.75rem;
  place-items: center;
  border-radius: 0.625rem;
  background: var(--cp-accent);
  color: var(--cp-accent-fg);
}

.auth-mark svg {
  width: 1.125rem;
  height: 1.125rem;
}

.auth-eyebrow {
  margin: 0 0 0.375rem;
  color: var(--cp-accent);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
}

.auth-dialog h2 {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.75rem;
  font-weight: 500;
}

.auth-copy {
  margin: 0.5rem 0 0;
  color: var(--cp-text-muted);
  font-size: 0.875rem;
}

.auth-dialog label {
  margin-bottom: -0.5rem;
  font-size: 0.8125rem;
  font-weight: 650;
}

.auth-dialog input {
  width: 100%;
  height: 2.75rem;
  border: 1px solid var(--cp-border-strong);
  border-radius: 0.625rem;
  background: var(--cp-bg-elevated);
  padding: 0 0.75rem;
  outline: none;
}

.auth-dialog input:focus {
  border-color: var(--cp-accent);
}

.auth-error {
  min-height: 1rem;
  margin: -0.25rem 0;
  color: var(--cp-danger);
  font-size: 0.75rem;
}

.auth-submit {
  display: flex;
  min-height: 2.75rem;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  border: 0;
  border-radius: 0.625rem;
  background: var(--cp-accent);
  color: var(--cp-accent-fg);
  font-weight: 650;
}

.auth-submit:hover:not(:disabled) {
  background: var(--cp-accent-hover);
}

.auth-submit:disabled {
  cursor: wait;
  opacity: 0.6;
}

.auth-submit svg {
  width: 1rem;
  height: 1rem;
}

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

@keyframes message-in {
  from {
    opacity: 0;
    transform: translateY(0.375rem);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes typing {
  from {
    opacity: 0.3;
    transform: translateY(0);
  }
  to {
    opacity: 1;
    transform: translateY(-0.25rem);
  }
}

@media (max-width: 760px) {
  .app-shell {
    display: block;
  }

  .sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    width: min(20rem, 88vw);
    transform: translateX(-100%);
    transition: transform 180ms ease;
  }

  body.sidebar-open .sidebar {
    transform: translateX(0);
  }

  .sidebar-scrim {
    position: fixed;
    inset: 0;
    z-index: 10;
    border: 0;
    background: var(--cp-overlay);
  }

  body.sidebar-open .sidebar-scrim {
    display: block;
  }

  .close-sidebar,
  .open-sidebar {
    display: grid;
  }

  .chat-panel {
    height: 100%;
  }

  .chat-header {
    min-height: 4rem;
    padding: 0.625rem 0.75rem;
  }

  .empty-state {
    justify-content: flex-start;
    padding-top: 10vh;
  }

  .prompt-grid {
    grid-template-columns: 1fr;
  }

  .prompt-option {
    min-height: 4.5rem;
  }

  .messages {
    padding: 1.25rem 1rem 5rem;
  }

  .composer-wrap {
    padding-inline: 0.75rem;
  }
}

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