@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:wght@400;500;600;700&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Computer+Modern+Serif:wght@400;500;600;700&display=swap');

:root {
  --bg: #ffffff;
  --text: #0b0b0d;
  --muted: #6b7280;
  --border: #e5e7eb;
  --panel: #f7f7f8;
  --shadow: 0 14px 40px rgba(15, 23, 42, 0.08);
  --font-ui: 'Computer Modern Serif', serif;
  --font-brand: 'Playfair Display', serif;
  --font-mono: 'Computer Modern Serif', serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-ui);
  color: var(--text);
  background: var(--bg);
}

#root {
  min-height: 100vh;
}

.app-shell {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: 280px;
  background: #ffffff;
  border-right: 1px solid var(--border);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  transition: width 0.2s ease, padding 0.2s ease;
}

.sidebar.collapsed {
  width: 72px;
  padding: 16px 10px;
  overflow: hidden;
}

.sidebar.collapsed .brand {
  display: none;
}

.sidebar.collapsed .conversation-item {
  padding: 10px;
}

.sidebar.collapsed .conversation-item span,
.sidebar.collapsed .conversation-item small {
  display: none;
}

.sidebar.collapsed .conversation-list,
.sidebar.collapsed .primary {
  display: none;
}

.sidebar.collapsed .sidebar-header {
  align-items: center;
}

.sidebar-header {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.brand-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.mobile-header-row {
  display: none;
}

.icon-button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--border);
  background: #ffffff;
  color: var(--text);
  padding: 8px 12px;
  border-radius: 999px;
  font-size: 0.9rem;
}

.sidebar.collapsed .icon-button {
  width: 100%;
  justify-content: center;
}

.icon-button .icon {
  font-size: 1rem;
}

.conversation-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  overflow-y: auto;
}

.conversation-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid transparent;
  background: #ffffff;
  text-align: left;
  cursor: pointer;
  font-family: var(--font-ui);
  position: relative;
}

.conversation-item.active {
  border-color: var(--border);
  background: var(--panel);
}

.conversation-title {
  font-family: var(--font-ui);
  font-weight: 600;
}

.chat-title {
  font-family: var(--font-brand);
  font-size: 1.6rem;
  font-weight: 600;
  margin: 0;
}

.conversation-item small {
  color: var(--muted);
}

.conversation-item small {
  color: var(--muted);
}

.conversation-actions {
  display: none;
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  gap: 4px;
}

.conversation-item:hover .conversation-actions,
.conversation-item.active .conversation-actions {
  display: flex;
}

.action-btn {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 6px;
  font-size: 0.8rem;
  cursor: pointer;
}

.action-btn.delete {
  color: #dc2626;
}

.action-btn.delete:hover {
  background: #fef2f2;
  border-color: #dc2626;
}

.chat-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.chat-header {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 24px 32px 8px;
  border-bottom: 1px solid var(--border);
}

.chat-title {
  font-family: var(--font-brand);
  font-size: 1.6rem;
  font-weight: 600;
  margin: 0;
}

.header-spacer {
  flex: 1;
}

.sign-out-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: all 0.2s ease;
}

.sign-out-button:hover {
  background: var(--panel);
  color: #dc2626;
  border-color: #fecaca;
}

.sign-out-button:active {
  transform: scale(0.95);
}

.conversation-title {
  font-family: var(--font-ui);
  font-weight: 600;
  font-size: 0.9rem;
}

.message-list {
  flex: 1;
  padding: 24px 32px 32px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  overflow-y: auto;
}

.message-bubble {
  max-width: 68%;
  padding: 14px 20px;
  border-radius: 20px;
  background: var(--panel);
  line-height: 1.6;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
  animation: messageFade 0.3s ease-out;
  transition: transform 0.2s ease;
}

@keyframes messageFade {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.message-bubble:hover {
  transform: scale(1.01);
}

.message-text {
  white-space: normal;
  word-break: break-word;
}

.message-text p {
  margin: 0 0 12px 0;
}

.message-text ul {
  margin: 12px 0;
  padding-left: 24px;
}

.message-text li {
  margin-bottom: 8px;
}

.message-text strong {
  font-weight: 600;
}

.message-text em {
  font-style: italic;
}

.message-text a {
  color: inherit;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.message-text pre {
  background: rgba(0, 0, 0, 0.05);
  border-radius: 4px;
  padding: 10px;
  overflow-x: auto;
  margin: 12px 0;
  font-size: 0.9rem;
}

.message-text .inline-code {
  background: rgba(0, 0, 0, 0.06);
  border-radius: 4px;
  padding: 2px 6px;
  font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
  font-size: 0.85em;
  color: #e11d48;
}

.message-text .heading {
  margin: 16px 0 8px 0;
  font-weight: 700;
  line-height: 1.3;
}

.message-text .heading-1 {
  font-size: 1.4rem;
  margin-top: 20px;
  border-bottom: 2px solid #e5e7eb;
  padding-bottom: 4px;
}

.message-text .heading-2 {
  font-size: 1.15rem;
  color: #1f2937;
}

.message-text .heading-3 {
  font-size: 1.05rem;
  color: #374151;
}

.message-text .list-bullet {
  margin: 8px 0;
  padding-left: 24px;
}

.message-text .list-bullet li {
  margin-bottom: 6px;
}

.message-text .list-numbered {
  margin: 8px 0;
  padding-left: 24px;
}

.message-text .list-numbered li {
  margin-bottom: 6px;
}

.message-text .blockquote {
  border-left: 3px solid #d1d5db;
  margin: 12px 0;
  padding: 8px 16px;
  background: rgba(0, 0, 0, 0.02);
  border-radius: 0 6px 6px 0;
  color: #4b5563;
  font-style: italic;
}

.message-text .table-wrapper {
  margin: 12px 0;
  overflow-x: auto;
  border-radius: 8px;
  border: 1px solid #e5e7eb;
}

.message-text .data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.message-text .data-table th {
  background: #f3f4f6;
  font-weight: 600;
  text-align: left;
  padding: 8px 12px;
  border-bottom: 2px solid #e5e7eb;
}

.message-text .data-table td {
  padding: 6px 12px;
  border-bottom: 1px solid #f3f4f6;
}

.message-text .data-table tr:last-child td {
  border-bottom: none;
}

.message-text .data-table tr:hover td {
  background: #fafafa;
}

.message-text .code-block-wrapper {
  margin: 12px 0;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid #e5e7eb;
}

.message-text .code-lang {
  background: #f3f4f6;
  padding: 4px 12px;
  font-size: 0.75rem;
  color: #6b7280;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-bottom: 1px solid #e5e7eb;
}

.message-text .code-block {
  background: #f9fafb;
  padding: 14px;
  margin: 0;
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.5;
  border-radius: 0;
}

.message-text .para {
  margin: 0 0 12px 0;
  line-height: 1.6;
}

.message-bubble.user {
  align-self: flex-end;
  background: #111827;
  color: #ffffff;
  border-bottom-right-radius: 4px;
  box-shadow: 0 4px 12px rgba(17, 24, 39, 0.15);
}

.message-bubble.assistant {
  align-self: flex-start;
  border-bottom-left-radius: 4px;
  border: 1px solid var(--border);
}

.thinking {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  font-size: 0.95rem;
}

.thinking .dot {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: #111827;
  animation: pulse 1.2s ease-in-out infinite;
}

@keyframes pulse {
  0% {
    transform: scale(1);
    opacity: 0.4;
  }
  50% {
    transform: scale(1.2);
    opacity: 1;
  }
  100% {
    transform: scale(1);
    opacity: 0.4;
  }
}

.composer {
  padding: 18px 32px 28px;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: #ffffff;
}

@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

.documents-container {
  position: relative;
}

.doc-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #ffffff;
  cursor: pointer;
  font-size: 1.2rem;
  transition: all 0.2s ease;
  position: relative;
}

.doc-btn:hover {
  background: var(--panel);
  border-color: #111827;
}

.doc-btn.active {
  background: #111827;
  color: #ffffff;
  border-color: #111827;
}

.doc-btn.has-selection {
  background: #e0e7ff;
  border-color: #4f46e5;
}

.doc-btn-icon {
  display: block;
}

.doc-badge {
  position: absolute;
  top: -8px;
  right: -8px;
  background: #dc2626;
  color: #ffffff;
  border-radius: 999px;
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 600;
}

.documents-box {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  width: 320px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
  z-index: 70;
}

.documents-box-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

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

.selected-count {
  background: #111827;
  color: #ffffff;
  padding: 2px 6px;
  border-radius: 3px;
  font-size: 0.8rem;
}

.clear-btn {
  background: transparent;
  border: 1px solid #e5e7eb;
  border-radius: 4px;
  padding: 4px 8px;
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.clear-btn:hover {
  background: #f3f4f6;
  border-color: #111827;
}

textarea {
  flex: 1;
  resize: none;
  border-radius: 14px;
  border: 1px solid var(--border);
  padding: 12px 14px;
  font-family: var(--font-ui);
  font-size: 1rem;
  color: var(--text);
}

textarea:focus {
  outline: none;
  border-color: #111827;
}

button {
  border: none;
  cursor: pointer;
  font-family: var(--font-ui);
}

button.primary {
  background: #111827;
  color: #ffffff;
  padding: 12px 18px;
  border-radius: 999px;
  font-weight: 600;
}

.send-icon {
  display: none;
}

button.primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

button.ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
  padding: 8px 12px;
  border-radius: 999px;
}

.slash-commands-dropdown {
  width: 320px;
}

.mobile-only {
  display: none;
}

.desktop-only {
  display: inline-flex;
}

.desktop-new-chat {
  display: inline-flex;
}

.desktop-only {
  display: inline-flex;
}

@media (max-width: 900px) {
  .sidebar-header > .primary.new-chat-btn {
    display: flex;
  }

  .sidebar-header > .primary:not(.new-chat-btn) {
    display: none;
  }

  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: 280px;
    height: 100vh;
    background: #ffffff;
    z-index: 20;
    padding: 24px;
  }

  .sidebar:not(.open) {
    display: none;
  }

  .brand-row {
    display: none;
  }

  .mobile-header-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    margin-bottom: 12px;
  }

  .new-chat-btn {
    flex: 1;
    margin-right: 8px;
  }

  .sidebar-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.25);
    z-index: 10;
  }

  .mobile-only {
    display: inline-flex;
  }

  .desktop-only {
    display: none;
  }

  .icon-label {
    display: none;
  }

  .chat-header {
    flex-direction: row;
    align-items: center;
    gap: 12px;
    padding: 16px 16px 8px !important;
  }

  .chat-header button {
    flex-shrink: 0;
  }

  .chat-title {
    font-size: 1.1rem;
  }

  .message-list {
    padding: 16px 16px 20px !important;
    gap: 12px;
  }

  .message-bubble {
    max-width: 100%;
    padding: 12px 14px;
    font-size: 0.95rem;
  }

  .thinking {
    font-size: 0.9rem;
  }

  .composer {
    gap: 8px;
    padding: 12px 16px 16px !important;
  }

  textarea {
    min-height: 44px;
    font-size: 16px;
  }

  button.primary {
    padding: 0;
    width: 44px;
    height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
  }

  .send-label {
    display: none;
  }

  .send-icon {
    display: inline;
  }

  .slash-commands-dropdown {
    width: calc(100vw - 32px) !important;
    left: 0 !important;
    max-height: 40vh;
    overflow-y: auto;
  }
}

/* ─── Loading Screen ───────────────────────────────────────────────── */

.loading-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: var(--bg);
}

.loading-spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--border);
  border-top-color: #111827;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}