:root {
  color-scheme: light dark;
  --bg: #f4f6fa;
  --panel: #ffffff;
  --panel-2: #f8fafc;
  --sidebar: #0b1020;
  --sidebar-2: #11182c;
  --text: #182033;
  --muted: #6b7280;
  --border: #e4e8ef;
  --accent: #5b6cff;
  --accent-2: #7c3aed;
  --accent-soft: #eef0ff;
  --assistant: #ffffff;
  --user: #eef2ff;
  --success: #22c55e;
  --danger: #ef4444;
  --shadow: 0 16px 44px rgba(15, 23, 42, 0.09);
  --radius: 18px;
}

html[data-theme="dark"] {
  --bg: #080d19;
  --panel: #0f1727;
  --panel-2: #121c2f;
  --sidebar: #070b14;
  --sidebar-2: #0d1423;
  --text: #edf2fb;
  --muted: #93a1b7;
  --border: #202b3e;
  --accent: #7b8cff;
  --accent-2: #9b6dff;
  --accent-soft: #18213b;
  --assistant: #0f1727;
  --user: #18213b;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.28);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  width: 100%;
  height: 100%;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
}

button, textarea { font: inherit; }

button { color: inherit; }

.app-shell {
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  padding: 20px 16px 16px;
  color: #eef2ff;
  background:
    radial-gradient(circle at 10% 0%, rgba(91,108,255,.22), transparent 34%),
    linear-gradient(180deg, var(--sidebar) 0%, var(--sidebar-2) 100%);
  border-right: 1px solid rgba(255,255,255,.06);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 4px 6px 20px;
}

.brand-mark {
  width: 40px;
  height: 40px;
  border-radius: 13px;
  display: grid;
  place-items: center;
  font-weight: 800;
  font-size: 20px;
  letter-spacing: -.04em;
  color: #fff;
  background: linear-gradient(135deg, #6b7cff, #8b5cf6);
  box-shadow: 0 10px 24px rgba(91,108,255,.35);
}

.brand-copy { min-width: 0; }

.brand-copy strong {
  display: block;
  font-size: 15px;
  letter-spacing: .01em;
}

.brand-copy span {
  display: block;
  margin-top: 3px;
  color: #9aa8c1;
  font-size: 11px;
  white-space: nowrap;
}

.icon-btn {
  border: 0;
  background: transparent;
  cursor: pointer;
  border-radius: 10px;
  padding: 8px;
}

.icon-btn:hover { background: rgba(255,255,255,.08); }

.new-chat-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  border: 1px solid rgba(255,255,255,.12);
  padding: 12px 14px;
  border-radius: 13px;
  cursor: pointer;
  color: white;
  background: rgba(255,255,255,.07);
  transition: .18s ease;
}

.new-chat-btn:hover {
  background: rgba(255,255,255,.11);
  border-color: rgba(255,255,255,.2);
}

.plus { font-size: 20px; line-height: 1; }

.sidebar-section-label {
  margin: 22px 10px 8px;
  color: #74829c;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.conversation-list {
  flex: 1;
  overflow-y: auto;
  padding-right: 2px;
}

.conversation-item {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 9px;
  border: 0;
  background: transparent;
  color: #c9d3e5;
  cursor: pointer;
  text-align: left;
  padding: 10px 11px;
  border-radius: 11px;
  margin-bottom: 4px;
}

.conversation-item:hover,
.conversation-item.active {
  background: rgba(255,255,255,.08);
  color: #fff;
}

.conversation-icon { opacity: .7; }

.conversation-title {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 13px;
}

.sidebar-footer {
  padding-top: 12px;
  border-top: 1px solid rgba(255,255,255,.07);
}

.footer-btn {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 9px;
  border: 0;
  background: transparent;
  color: #aebbd0;
  padding: 10px 11px;
  border-radius: 10px;
  cursor: pointer;
  text-align: left;
  font-size: 13px;
}

.footer-btn:hover { background: rgba(255,255,255,.07); color: #fff; }
.danger-soft:hover { color: #ffb4b4; }

.main-panel {
  min-width: 0;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  height: 100vh;
  background:
    radial-gradient(circle at 50% -15%, rgba(91,108,255,.08), transparent 30%),
    var(--bg);
}

.topbar {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 24px;
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--panel) 88%, transparent);
  backdrop-filter: blur(16px);
  z-index: 20;
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.eyebrow {
  font-size: 10px;
  font-weight: 800;
  letter-spacing: .16em;
  color: var(--accent);
}

.topbar-title {
  margin-top: 2px;
  font-weight: 700;
  font-size: 15px;
}

.status-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--muted);
  padding: 8px 11px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--panel);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #f59e0b;
  box-shadow: 0 0 0 4px rgba(245,158,11,.12);
}

.status-dot.online {
  background: var(--success);
  box-shadow: 0 0 0 4px rgba(34,197,94,.12);
}

.status-dot.offline {
  background: var(--danger);
  box-shadow: 0 0 0 4px rgba(239,68,68,.12);
}

.chat-stage {
  overflow-y: auto;
  padding: 36px 20px 24px;
}

.welcome {
  width: min(820px, 100%);
  margin: 6vh auto 0;
  text-align: center;
}

.welcome-badge {
  width: 58px;
  height: 58px;
  margin: 0 auto 18px;
  display: grid;
  place-items: center;
  border-radius: 18px;
  color: white;
  font-weight: 800;
  letter-spacing: .03em;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 14px 34px rgba(91,108,255,.22);
}

.welcome h1 {
  margin: 0;
  font-size: clamp(28px, 5vw, 42px);
  letter-spacing: -.04em;
}

.welcome > p {
  width: min(680px, 100%);
  margin: 14px auto 28px;
  color: var(--muted);
  line-height: 1.7;
}

.suggestion-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  text-align: left;
}

.suggestion {
  border: 1px solid var(--border);
  border-radius: 15px;
  padding: 15px 16px;
  background: var(--panel);
  cursor: pointer;
  color: var(--muted);
  line-height: 1.45;
  box-shadow: 0 8px 24px rgba(15,23,42,.03);
  transition: .18s ease;
}

.suggestion:hover {
  transform: translateY(-2px);
  border-color: color-mix(in srgb, var(--accent) 40%, var(--border));
  box-shadow: var(--shadow);
}

.suggestion-title {
  display: block;
  margin-bottom: 5px;
  color: var(--text);
  font-weight: 700;
  font-size: 13px;
}

.grounding-note {
  margin: 22px auto 0;
  display: inline-flex;
  align-items: flex-start;
  gap: 8px;
  padding: 10px 13px;
  border-radius: 12px;
  color: var(--muted);
  background: var(--panel-2);
  border: 1px solid var(--border);
  font-size: 12px;
  text-align: left;
}

.messages {
  width: min(900px, 100%);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.message-row {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.message-row.user { justify-content: flex-end; }

.avatar {
  flex: 0 0 auto;
  width: 34px;
  height: 34px;
  border-radius: 11px;
  display: grid;
  place-items: center;
  font-size: 12px;
  font-weight: 800;
}

.message-row.assistant .avatar {
  color: white;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
}

.message-row.user .avatar {
  order: 2;
  color: var(--text);
  border: 1px solid var(--border);
  background: var(--panel);
}

.message-stack {
  max-width: min(760px, calc(100% - 50px));
}

.message-row.user .message-stack {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
}

.bubble {
  padding: 14px 16px;
  border-radius: 16px;
  border: 1px solid var(--border);
  line-height: 1.72;
  font-size: 14px;
  white-space: pre-wrap;
  word-break: break-word;
}

.message-row.assistant .bubble {
  background: var(--assistant);
  border-top-left-radius: 6px;
  box-shadow: 0 8px 24px rgba(15,23,42,.035);
}

.message-row.user .bubble {
  background: var(--user);
  border-color: color-mix(in srgb, var(--accent) 15%, var(--border));
  border-top-right-radius: 6px;
}

.message-meta {
  margin-top: 6px;
  color: var(--muted);
  font-size: 11px;
}

.typing-caret {
  display: inline-block;
  width: 7px;
  height: 16px;
  margin-left: 2px;
  vertical-align: -3px;
  border-radius: 2px;
  background: var(--accent);
  animation: blink 1s step-end infinite;
}

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

.sources-wrap {
  margin-top: 10px;
}

.sources-toggle {
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text);
  padding: 8px 11px;
  border-radius: 10px;
  cursor: pointer;
  font-size: 12px;
}

.sources-grid {
  display: none;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin-top: 9px;
}

.sources-wrap.open .sources-grid { display: grid; }

.source-card {
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--panel-2);
  padding: 10px 11px;
}

.source-id {
  color: var(--accent);
  font-weight: 800;
  font-size: 11px;
}

.source-main {
  margin-top: 4px;
  font-size: 12px;
  font-weight: 700;
}

.source-sub {
  margin-top: 4px;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.45;
}

.status-line {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 12px;
  margin: 6px 0 0 46px;
}

.spinner {
  width: 12px;
  height: 12px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin .8s linear infinite;
}

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

.composer-shell {
  padding: 12px 20px 16px;
  background: linear-gradient(180deg, transparent, var(--bg) 18%);
}

.composer {
  width: min(900px, 100%);
  margin: 0 auto;
  padding: 10px 10px 8px 14px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.composer:focus-within {
  border-color: color-mix(in srgb, var(--accent) 55%, var(--border));
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 10%, transparent), var(--shadow);
}

#messageInput {
  width: 100%;
  min-height: 28px;
  max-height: 180px;
  resize: none;
  outline: none;
  border: 0;
  background: transparent;
  color: var(--text);
  line-height: 1.55;
  font-size: 14px;
  padding: 4px 2px 8px;
}

#messageInput::placeholder { color: color-mix(in srgb, var(--muted) 75%, transparent); }

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

.composer-hint {
  color: var(--muted);
  font-size: 10px;
}

.kbd {
  padding: 2px 5px;
  border-radius: 5px;
  background: var(--panel-2);
  border: 1px solid var(--border);
}

.dot-sep { padding: 0 5px; }

.send-btn {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border: 0;
  border-radius: 12px;
  cursor: pointer;
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 8px 18px rgba(91,108,255,.22);
  transition: .15s ease;
}

.send-btn:hover { transform: translateY(-1px); }
.send-btn:disabled { opacity: .5; cursor: not-allowed; transform: none; }

.footer-disclaimer {
  width: min(900px, 100%);
  margin: 8px auto 0;
  text-align: center;
  color: var(--muted);
  font-size: 10px;
}

.sidebar-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.42);
  z-index: 40;
}

.mobile-only,
.desktop-hidden { display: none; }

[dir="rtl"] .message-row.user .avatar { order: 0; }
[dir="rtl"] .message-row.user { justify-content: flex-start; }
[dir="rtl"] .message-row.user .message-stack { align-items: flex-start; }
[dir="rtl"] .message-row.user .bubble { border-top-right-radius: 16px; border-top-left-radius: 6px; }
[dir="rtl"] .message-row.assistant .bubble { border-top-left-radius: 16px; border-top-right-radius: 6px; }

@media (max-width: 900px) {
  .app-shell { grid-template-columns: 1fr; }

  .sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    width: min(310px, 88vw);
    z-index: 50;
    transform: translateX(-102%);
    transition: transform .22s ease;
    box-shadow: 24px 0 60px rgba(0,0,0,.25);
  }

  .sidebar.open { transform: translateX(0); }
  .sidebar-backdrop.show { display: block; }

  .mobile-only,
  .desktop-hidden { display: inline-grid; }

  .brand .mobile-only { margin-left: auto; color: #cbd5e1; }

  .main-panel { height: 100dvh; }

  .topbar { padding: 12px 14px; min-height: 66px; }
  .status-wrap { display: none; }
  .chat-stage { padding: 24px 12px 18px; }
  .composer-shell { padding: 8px 10px 12px; }

  .suggestion-grid { grid-template-columns: 1fr; }
  .sources-grid { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
  .welcome { margin-top: 2vh; }
  .welcome h1 { font-size: 30px; }
  .welcome > p { font-size: 13px; }
  .composer-hint { display: none; }
  .message-stack { max-width: calc(100% - 44px); }
  .bubble { font-size: 13.5px; padding: 12px 13px; }
  .avatar { width: 32px; height: 32px; }
}