:root {
  --background: #121214;
  --surface: #17181b;
  --surface-low: #1c1d21;
  --surface-high: #26272c;
  --surface-elevated: #2f3137;
  --primary: #ce1141;
  --primary-deep: #8d1232;
  --primary-soft: rgba(206, 17, 65, 0.14);
  --secondary: #b7bdc7;
  --on-surface: #eef1f4;
  --muted: #8f97a2;
  --border: rgba(255, 255, 255, 0.08);
  --shadow-soft: 0 24px 60px rgba(0, 0, 0, 0.35);
  --font-headline: "Space Grotesk", sans-serif;
  --font-body: "Inter", sans-serif;
  --transition: 180ms ease;
  --content-width: 1080px;
}

* { box-sizing: border-box; }
html { color-scheme: dark; }
body {
  margin: 0;
  min-height: 100vh;
  overflow: hidden;
  font-family: var(--font-body);
  color: var(--on-surface);
  background:
    radial-gradient(circle at top left, rgba(206, 17, 65, 0.12), transparent 28%),
    radial-gradient(circle at 100% 100%, rgba(206, 17, 65, 0.08), transparent 22%),
    linear-gradient(180deg, rgba(255,255,255,0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px),
    var(--background);
  background-size: auto, auto, 30px 30px, 30px 30px, auto;
}

a { color: inherit; }
button, textarea { font: inherit; }
.material-symbols-outlined {
  font-variation-settings: "FILL" 0, "wght" 500, "GRAD" 0, "opsz" 24;
}

.page-shell { display: flex; height: 100vh; overflow: hidden; }
.sidebar {
  width: 286px;
  flex: 0 0 286px;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  padding: 1.5rem 1rem 1rem;
  background: rgba(20, 21, 24, 0.96);
  border-right: 1px solid var(--border);
}
.sidebar-brand { display: flex; align-items: center; gap: 0.875rem; padding: 0.25rem 0.5rem; }
.brand-mark {
  width: 42px; height: 42px; border-radius: 0.9rem; object-fit: cover;
  box-shadow: 0 10px 24px rgba(206, 17, 65, 0.18);
}
.brand-title, .brand-eyebrow { margin: 0; }
.brand-title {
  font-family: var(--font-headline); font-size: 1rem; font-weight: 700; letter-spacing: 0.12em;
}
.brand-eyebrow {
  margin-top: 0.15rem; color: var(--secondary); font-size: 0.7rem; font-weight: 500; letter-spacing: 0.16em;
}
.new-session-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem;
  width: 100%; min-height: 48px; padding: 0.875rem 1rem; border: 0; border-radius: 1rem;
  background: linear-gradient(135deg, #e21c50, #b30f38); color: #ffe8ee;
  font-family: var(--font-headline); font-size: 0.84rem; font-weight: 700; letter-spacing: 0.12em;
  text-transform: uppercase; cursor: pointer;
  box-shadow: 0 16px 32px rgba(206, 17, 65, 0.22);
  transition: transform var(--transition), filter var(--transition), box-shadow var(--transition);
}
.new-session-btn:hover { transform: translateY(-1px); filter: brightness(1.04); }
.sidebar-panel {
  padding: 1rem; border: 1px solid var(--border); border-radius: 1rem;
  background: linear-gradient(180deg, rgba(37, 38, 43, 0.9), rgba(25, 26, 30, 0.96));
}
.sidebar-panel--muted { background: rgba(255,255,255,0.03); }
.nav-section-label {
  margin: 0 0 0.75rem; color: var(--secondary); font-family: var(--font-headline);
  font-size: 0.72rem; font-weight: 600; letter-spacing: 0.18em; text-transform: uppercase;
}
.stack-list { display: flex; flex-direction: column; gap: 0.75rem; }
.stack-item { display: flex; flex-direction: column; gap: 0.18rem; }
.stack-key { color: var(--muted); font-size: 0.76rem; text-transform: uppercase; letter-spacing: 0.08em; }
.stack-value { font-size: 0.95rem; font-weight: 600; }
.sidebar-copy { margin: 0; color: var(--secondary); font-size: 0.86rem; line-height: 1.55; }

.chat-main { position: relative; display: flex; flex: 1; flex-direction: column; min-width: 0; }
.chat-main {
  --scrollbar-size: 10px;
  --scrollbar-thumb: rgba(255, 255, 255, 0.18);
  --scrollbar-thumb-hover: rgba(206, 17, 65, 0.5);
  --scrollbar-track: rgba(255, 255, 255, 0.04);
}
.bg-accents { position: absolute; inset: 0; overflow: hidden; pointer-events: none; }
.bg-accent {
  position: absolute; width: 340px; height: 340px; border-radius: 999px; filter: blur(24px); opacity: 0.32;
  background: radial-gradient(circle, rgba(206,17,65,0.7) 0%, rgba(206,17,65,0) 70%);
}
.bg-accent--tl { top: -120px; left: -110px; }
.bg-accent--br { right: -90px; bottom: -140px; }
.chat-header {
  position: relative; z-index: 1; display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; width: min(calc(100% - 4rem), var(--content-width)); margin: 0 auto;
  padding: 1.5rem 0 1rem;
}
.chat-header-label, .chat-header-subtitle { margin: 0; }
.chat-header-label {
  font-family: var(--font-headline); font-size: 1.22rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase;
}
.chat-header-subtitle { margin-top: 0.3rem; color: var(--secondary); font-size: 0.95rem; }
.response-status {
  padding: 0.55rem 0.9rem; border: 1px solid var(--border); border-radius: 999px;
  background: rgba(255,255,255,0.04); color: var(--secondary); font-size: 0.82rem; font-weight: 600;
}
.message-list {
  position: relative; z-index: 1; display: flex; flex: 1; flex-direction: column; gap: 1rem;
  width: calc(100% - 1.5rem); margin: 0 0 0 auto; padding: 0 1rem 1.5rem 0;
  overflow-y: auto; overflow-x: hidden; scrollbar-gutter: stable;
  scrollbar-width: thin; scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track);
}
.message-list::-webkit-scrollbar {
  width: var(--scrollbar-size);
}
.message-list::-webkit-scrollbar-track {
  background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.06));
  border-radius: 999px;
}
.message-list::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, rgba(255,255,255,0.16), rgba(255,255,255,0.28));
  border-radius: 999px;
  border: 2px solid transparent;
  background-clip: padding-box;
}
.message-list::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(180deg, rgba(206,17,65,0.42), rgba(206,17,65,0.66));
  border: 2px solid transparent;
  background-clip: padding-box;
}
.message-row { display: flex; width: 100%; }
.message-row {
  width: min(calc(100% - 3rem), var(--content-width));
  margin: 0 auto;
}
.message-row--user { justify-content: flex-end; }
.message-row--assistant { justify-content: flex-start; }
.message-card {
  width: min(820px, 100%);
  border: 1px solid var(--border); border-radius: 1.25rem;
  box-shadow: var(--shadow-soft); overflow: hidden;
}
.message-row--user .message-card {
  width: min(480px, 100%);
}
.message-card--user {
  background: linear-gradient(135deg, rgba(206, 17, 65, 0.96), rgba(137, 16, 47, 0.94));
  color: #fff3f6;
}
.message-card--assistant {
  background: linear-gradient(180deg, rgba(33, 34, 39, 0.98), rgba(23, 24, 28, 0.98));
}
.message-card--pending {
  border-color: rgba(206, 17, 65, 0.22);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.35), 0 0 0 1px rgba(206, 17, 65, 0.08);
}
.message-card__body { padding: 1rem 1.1rem; }
.message-role {
  margin: 0 0 0.55rem; color: var(--secondary); font-size: 0.75rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase;
}
.message-card--user .message-role { color: rgba(255,255,255,0.76); }
.message-text {
  margin: 0; white-space: pre-wrap; line-height: 1.7; font-size: 0.98rem;
}
.message-text--markdown {
  white-space: normal;
  font-size: 1rem;
}
.message-text--markdown > *:first-child { margin-top: 0; }
.message-text--markdown > *:last-child { margin-bottom: 0; }
.message-text--markdown p,
.message-text--markdown ul,
.message-text--markdown ol,
.message-text--markdown h2,
.message-text--markdown h3,
.message-text--markdown h4 {
  margin: 0 0 1rem;
}
.message-text--markdown h2,
.message-text--markdown h3,
.message-text--markdown h4 {
  font-family: var(--font-headline);
  line-height: 1.2;
}
.message-text--markdown h2 {
  font-size: 1.28rem;
  letter-spacing: 0.03em;
}
.message-text--markdown h3 {
  font-size: 1.08rem;
  letter-spacing: 0.02em;
  color: #fff7f9;
}
.message-text--markdown h4 {
  font-size: 0.94rem;
  letter-spacing: 0.03em;
  color: #f5cbd5;
}
.message-text--markdown ul,
.message-text--markdown ol {
  padding-left: 1.35rem;
}
.message-text--markdown li {
  line-height: 1.72;
}
.message-text--markdown li + li {
  margin-top: 0.52rem;
}
.message-text--markdown strong {
  color: #fff8fa;
  font-weight: 700;
}
.message-text--markdown em {
  color: #f3d3db;
}
.message-text--markdown code {
  padding: 0.12rem 0.38rem;
  border-radius: 0.45rem;
  background: rgba(255,255,255,0.08);
  color: #ffd7e1;
  font-size: 0.9em;
}
.message-text--markdown a {
  color: #ffd2dd;
  text-decoration-color: rgba(255,255,255,0.28);
}
.message-text--markdown br { line-height: 1.8; }
.message-text--markdown .markdown-table-wrap {
  margin: 0 0 1rem;
  overflow-x: auto;
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 16px;
  background: rgba(8,10,16,0.78);
}
.message-text--markdown .markdown-table {
  width: 100%;
  min-width: 520px;
  border-collapse: collapse;
  font-size: 0.95rem;
}
.message-text--markdown .markdown-table th,
.message-text--markdown .markdown-table td {
  padding: 0.85rem 1rem;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.message-text--markdown .markdown-table th {
  color: #fff4f4;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  background: rgba(123,29,44,0.28);
}
.message-text--markdown .markdown-table td {
  color: rgba(240,243,250,0.94);
}
.message-text--markdown .markdown-table tbody tr:last-child td {
  border-bottom: none;
}
.message-text--markdown .markdown-table tbody tr:nth-child(even) td {
  background: rgba(255,255,255,0.02);
}
.message-text--markdown .markdown-table code {
  white-space: nowrap;
}
.message-pending {
  display: inline-flex;
  flex-direction: column;
  gap: 0.7rem;
}
.message-pending-dots {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}
.message-pending-dot {
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 999px;
  background: rgba(206, 17, 65, 0.92);
  animation: pending-pulse 1.15s infinite ease-in-out;
}
.message-pending-dot:nth-child(2) { animation-delay: 0.15s; }
.message-pending-dot:nth-child(3) { animation-delay: 0.3s; }
.message-pending-label {
  margin: 0;
  color: var(--secondary);
  font-size: 0.88rem;
}
@keyframes pending-pulse {
  0%, 80%, 100% { transform: translateY(0); opacity: 0.32; }
  40% { transform: translateY(-4px); opacity: 1; }
}
.message-actions {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.4rem;
  padding: 0 1.1rem 0.95rem;
}
.message-action-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 999px;
  background: rgba(255,255,255,0.03);
  color: var(--muted);
  cursor: pointer;
  transition: transform var(--transition), border-color var(--transition), background var(--transition), color var(--transition);
}
.message-action-button:hover:not(:disabled) {
  transform: translateY(-1px);
  border-color: rgba(206, 17, 65, 0.28);
  background: rgba(206, 17, 65, 0.08);
  color: #ffe6ed;
}
.message-action-button:focus-visible {
  outline: 2px solid rgba(206, 17, 65, 0.65);
  outline-offset: 2px;
}
.message-action-button:disabled {
  cursor: default;
}
.message-action-button svg {
  width: 1rem;
  height: 1rem;
  fill: currentColor;
}
.message-action-button.is-loading {
  opacity: 0.72;
}
.message-action-button.is-open {
  border-color: rgba(206, 17, 65, 0.32);
  background: rgba(206, 17, 65, 0.1);
  color: #ffe6ed;
}
.message-action-button.is-flagged,
.message-action-button--flag:disabled {
  color: #ff8fab;
  border-color: rgba(206, 17, 65, 0.35);
  background: rgba(206, 17, 65, 0.12);
}
.message-flag-menu {
  position: absolute;
  right: 1.1rem;
  bottom: calc(100% - 0.2rem);
  min-width: 220px;
  padding: 0.55rem;
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 0.95rem;
  background: linear-gradient(180deg, rgba(39, 40, 46, 0.98), rgba(23, 24, 28, 0.98));
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.34);
  z-index: 5;
}
.message-flag-menu__label {
  margin: 0 0 0.35rem;
  padding: 0.25rem 0.45rem 0.35rem;
  color: var(--secondary);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.message-flag-menu__option {
  display: block;
  width: 100%;
  padding: 0.7rem 0.8rem;
  border: 0;
  border-radius: 0.7rem;
  background: transparent;
  color: var(--on-surface);
  text-align: left;
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
}
.message-flag-menu__option:hover,
.message-flag-menu__option:focus-visible {
  background: rgba(206, 17, 65, 0.12);
  color: #fff3f6;
  outline: none;
}
.message-citations {
  padding: 0.9rem 1.1rem 1rem; border-top: 1px solid var(--border); background: rgba(255,255,255,0.02);
}
.citation-label {
  margin: 0 0 0.75rem; color: var(--secondary); font-size: 0.72rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase;
}
.citation-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 0.6rem;
}
.citation-chip {
  display: inline-flex; flex-direction: column; gap: 0.2rem; min-height: 0; padding: 0.78rem 0.88rem;
  border: 1px solid rgba(255,255,255,0.08); border-radius: 1rem; background: rgba(255,255,255,0.03);
  text-decoration: none;
  transition: transform var(--transition), border-color var(--transition), background var(--transition);
}
.citation-chip:hover {
  transform: translateY(-1px);
  border-color: rgba(206, 17, 65, 0.28);
  background: rgba(206, 17, 65, 0.08);
}
.citation-chip--static:hover {
  transform: none;
  border-color: rgba(255,255,255,0.08);
  background: rgba(255,255,255,0.03);
}
.citation-chip:focus-visible {
  outline: 2px solid rgba(206, 17, 65, 0.65);
  outline-offset: 2px;
}
.citation-title {
  font-size: 0.84rem; font-weight: 700; color: #f7f9fb; line-height: 1.35;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.citation-section {
  font-size: 0.72rem; color: #d5d9df; line-height: 1.35;
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.citation-preview {
  margin-top: 0.16rem; font-size: 0.72rem; color: var(--muted); line-height: 1.45;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.composer-area {
  position: relative; z-index: 1; width: min(calc(100% - 4rem), var(--content-width)); margin: 0 auto; padding: 0 0 1.5rem;
}
.composer-shell {
  display: flex; align-items: flex-end; gap: 0.75rem; padding: 0.8rem 0.9rem;
  border: 1px solid rgba(255,255,255,0.08); border-radius: 1.35rem;
  background: rgba(18,19,22,0.95); box-shadow: var(--shadow-soft);
}
#message-input {
  flex: 1; min-height: 28px; max-height: 220px; resize: none; border: 0; outline: none;
  background: transparent; color: var(--on-surface); line-height: 1.5;
}
#message-input::placeholder { color: var(--muted); }
#message-input:disabled { opacity: 0.72; cursor: not-allowed; }
.send-btn {
  width: 44px; height: 44px; border: 0; border-radius: 999px; cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, #e21c50, #b30f38); color: #fff;
  box-shadow: 0 14px 24px rgba(206, 17, 65, 0.28);
}
.send-btn:disabled {
  cursor: wait;
  opacity: 0.72;
  filter: grayscale(0.18);
}
.composer-disclaimer { margin: 0.75rem 0 0; color: var(--muted); font-size: 0.78rem; line-height: 1.5; }
.empty-state {
  display: grid; place-items: center; flex: 1; min-height: 280px; padding: 2rem 0;
}
.empty-card {
  width: min(760px, 100%); padding: 1.75rem 1.85rem; border: 1px solid var(--border); border-radius: 1.4rem;
  background: linear-gradient(180deg, rgba(34,35,40,0.92), rgba(22,23,27,0.98));
  box-shadow: var(--shadow-soft);
}
.empty-title { margin: 0; font-family: var(--font-headline); font-size: 1.5rem; line-height: 1.15; }
.empty-copy { margin: 0.72rem 0 0; color: var(--secondary); line-height: 1.72; font-size: 0.98rem; }
.empty-prompts { display: flex; flex-wrap: wrap; gap: 0.65rem; margin-top: 1.1rem; }
.prompt-chip {
  padding: 0.78rem 0.95rem; border: 1px solid rgba(255,255,255,0.08); border-radius: 999px;
  background: rgba(255,255,255,0.03); color: var(--on-surface); cursor: pointer;
  transition: transform var(--transition), border-color var(--transition), background var(--transition);
}
.prompt-chip:hover {
  transform: translateY(-1px);
  border-color: rgba(206, 17, 65, 0.28);
  background: rgba(206, 17, 65, 0.08);
}
@media (max-width: 960px) {
  body { overflow: auto; }
  .page-shell { flex-direction: column; height: auto; min-height: 100vh; }
  .sidebar { width: 100%; flex: none; border-right: 0; border-bottom: 1px solid var(--border); }
  .chat-header,
  .message-list,
  .composer-area {
    width: min(calc(100% - 2rem), var(--content-width));
  }
  .message-list {
    width: calc(100% - 0.75rem);
    padding-right: 0.5rem;
  }
  .message-row {
    width: 100%;
  }
  .message-card,
  .message-row--user .message-card,
  .empty-card {
    width: 100%;
  }
}
@media (max-width: 640px) {
  .chat-header {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.75rem;
    padding-top: 1rem;
  }
  .chat-header-label { font-size: 1.08rem; }
  .chat-header-subtitle { font-size: 0.88rem; }
  .message-list { gap: 0.85rem; }
  .message-card__body { padding: 0.95rem 0.95rem; }
  .message-citations { padding: 0.9rem 0.95rem 1rem; }
  .citation-list { grid-template-columns: 1fr; }
  .message-text--markdown .markdown-table {
    min-width: 420px;
    font-size: 0.9rem;
  }
  .message-text--markdown .markdown-table th,
  .message-text--markdown .markdown-table td {
    padding: 0.72rem 0.8rem;
  }
  .empty-title { font-size: 1.28rem; }
  .empty-card { padding: 1.35rem 1.1rem; }
}


.message-actions {
  display: flex;
  justify-content: flex-end;
  padding: 0 1rem 0.9rem;
}

.flag-button {
  appearance: none;
  border: 1px solid rgba(255,255,255,0.12);
  background: rgba(255,255,255,0.04);
  color: rgba(255,255,255,0.78);
  border-radius: 999px;
  padding: 0.38rem 0.75rem;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  cursor: pointer;
  transition: background 160ms ease, border-color 160ms ease, color 160ms ease;
}

.flag-button:hover:not(:disabled),
.flag-button:focus-visible:not(:disabled) {
  background: rgba(206, 17, 65, 0.18);
  border-color: rgba(206, 17, 65, 0.45);
  color: #fff;
}

.flag-button:disabled {
  opacity: 0.72;
  cursor: default;
}