:root {
  --bg: #0f172a;
  --panel: #111827;
  --text: #e5e7eb;
  --muted: #9ca3af;
  --accent: #38bdf8;
  --border: #1f2937;
}
* { box-sizing: border-box; }
body.page {
  margin: 0;
  font-family: system-ui, Segoe UI, Roboto, Arial, sans-serif;
  background: radial-gradient(1200px 600px at 10% 0%, #1e293b 0%, var(--bg) 45%);
  color: var(--text);
  min-height: 100vh;
}
.center { min-height: 100vh; display: grid; place-items: center; padding: 24px; }
.panel {
  width: min(420px, 100%);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px;
  box-shadow: 0 24px 48px rgba(0,0,0,0.35);
}
h1 { margin: 0 0 8px 0; font-size: 22px; }
.muted { color: var(--muted); font-size: 14px; }
.form { display: grid; gap: 8px; margin-top: 16px; }
input, textarea {
  width: 100%;
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #0b1220;
  color: var(--text);
}
.primary {
  margin-top: 8px;
  padding: 12px 14px;
  border-radius: 8px;
  border: 0;
  background: linear-gradient(90deg, #38bdf8, #6366f1);
  color: #0f172a;
  font-weight: 700;
  cursor: pointer;
}
.ghost {
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  cursor: pointer;
}
.error { color: #fecaca; }
.topbar {
  border-bottom: 1px solid var(--border);
  background: rgba(17, 24, 39, 0.76);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 2;
}
.topbar-inner {
  max-width: min(1200px, 100%);
  margin: 0 auto;
  padding: 14px 18px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}
.toolbar { display: flex; gap: 8px; flex-shrink: 0; }
.app-shell {
  max-width: min(1200px, 100%);
  margin: 0 auto;
  padding: 0 16px 24px;
  box-sizing: border-box;
}
.layout {
  display: grid;
  grid-template-columns: min(260px, 34%) 1fr;
  gap: 0;
  min-height: calc(100vh - 54px);
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
  background: rgba(17, 24, 39, 0.35);
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.25);
}
.sidebar {
  border-right: 1px solid var(--border);
  padding: 14px 12px;
  background: rgba(15, 23, 42, 0.5);
}
.sidebar h2 {
  margin: 0 0 12px 0;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--muted);
  text-transform: uppercase;
}
.convlist {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 8px;
}
.linkish {
  text-align: left;
  border: 1px solid var(--border);
  background: #0b1220;
  color: var(--text);
  border-radius: 8px;
  padding: 8px 10px;
  cursor: pointer;
}
.chat {
  display: flex;
  flex-direction: column;
  min-height: 0;
}
.messages-scroll {
  flex: 1;
  overflow-y: auto;
  min-height: 0;
  scroll-behavior: smooth;
}
.messages-track {
  max-width: 720px;
  margin: 0 auto;
  padding: 16px 14px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.bubble {
  max-width: min(92%, 640px);
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: #0b1220;
  white-space: pre-wrap;
  line-height: 1.45;
  font-size: 15px;
}
.bubble.user {
  border-color: #334155;
  margin-left: auto;
  background: linear-gradient(180deg, #172554 0%, #0b1220 100%);
}
.bubble.bot { border-color: rgba(56, 189, 248, 0.35); }
.typing-row { align-self: flex-start; max-width: min(92%, 400px); }
.typing-bubble {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  animation: bubble-in 0.25s ease;
}
.typing-title {
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.02em;
}
.typing-dots {
  display: inline-flex;
  gap: 4px;
  align-items: center;
}
.typing-dots span {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  animation: typing-bounce 1.1s ease-in-out infinite;
}
.typing-dots span:nth-child(2) { animation-delay: 0.15s; }
.typing-dots span:nth-child(3) { animation-delay: 0.3s; }
@keyframes typing-bounce {
  0%, 60%, 100% { opacity: 0.35; transform: translateY(0); }
  30% { opacity: 1; transform: translateY(-3px); }
}
@keyframes bubble-in {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}
.composer {
  border-top: 1px solid var(--border);
  padding: 14px 16px 18px;
  background: rgba(17, 24, 39, 0.85);
}
.composer-inner {
  max-width: 720px;
  margin: 0 auto;
  display: grid;
  gap: 10px;
}
.file { display: flex; align-items: center; gap: 8px; color: var(--muted); font-size: 14px; }
.status-line { margin: 0; min-height: 1.2em; font-size: 13px; }
.send-btn {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}
.send-btn .send-spinner {
  display: none;
  width: 18px;
  height: 18px;
  border: 2px solid rgba(15, 23, 42, 0.35);
  border-top-color: #0f172a;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
.send-btn.is-loading .send-label { opacity: 0.85; }
.send-btn.is-loading .send-spinner { display: block; }
@keyframes spin { to { transform: rotate(360deg); } }
@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; border-radius: 0; border-left: 0; border-right: 0; }
  .sidebar { border-right: 0; border-bottom: 1px solid var(--border); max-height: 180px; overflow-y: auto; }
  .app-shell { padding: 0 8px 16px; }
}