:root {
  --bg: #081120;
  --panel: rgba(10, 19, 34, 0.9);
  --panel-2: rgba(15, 26, 46, 0.92);
  --text: #ecf3ff;
  --muted: #9fb1cc;
  --line: rgba(255, 255, 255, 0.08);
  --primary: #5aa8ff;
  --primary-2: #7b61ff;
  --danger: #ff6b81;
  --success: #29d391;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  font-family: 'Inter', sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(90,168,255,0.18), transparent 30%),
    radial-gradient(circle at bottom right, rgba(123,97,255,0.2), transparent 28%),
    linear-gradient(135deg, #050b16, #0a1324 45%, #081120);
}
button, input, textarea { font: inherit; }
button { cursor: pointer; }

.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: 20px;
  padding: 20px;
}

.sidebar, .chat-panel {
  border: 1px solid var(--line);
  background: var(--panel);
  backdrop-filter: blur(18px);
  box-shadow: var(--shadow);
}

.sidebar {
  border-radius: 28px;
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.brand-badge {
  width: 52px;
  height: 52px;
  border-radius: 18px;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  font-weight: 800;
  margin-bottom: 14px;
}

h1, h2, h3, p { margin: 0; }
h1 { font-size: 1.8rem; }
.brand-subtitle { color: var(--muted); margin-top: 8px; }

.card {
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 16px;
}

.setup-card { display: grid; gap: 10px; }
.setup-card label { font-size: 0.92rem; color: var(--muted); }
input, textarea {
  width: 100%;
  border: 1px solid rgba(255,255,255,0.08);
  background: rgba(6, 12, 23, 0.95);
  color: var(--text);
  border-radius: 16px;
  padding: 14px 16px;
  outline: none;
}
input:focus, textarea:focus {
  border-color: rgba(90,168,255,0.8);
  box-shadow: 0 0 0 4px rgba(90,168,255,0.14);
}
textarea { resize: vertical; }
.hint { color: var(--muted); font-size: 0.84rem; line-height: 1.6; }
.small-card ul {
  padding-left: 18px;
  margin: 12px 0 0;
  color: var(--muted);
  display: grid;
  gap: 8px;
}

.secondary-btn, .ghost-btn, .send-btn, .quick-btn, .copy-btn {
  border: 0;
  border-radius: 16px;
  transition: 0.2s ease;
}
.secondary-btn, .send-btn {
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  color: white;
  padding: 13px 16px;
  font-weight: 700;
}
.secondary-btn:hover, .send-btn:hover { transform: translateY(-1px); filter: brightness(1.05); }

.chat-panel {
  border-radius: 32px;
  min-height: calc(100vh - 40px);
  display: grid;
  grid-template-rows: auto 1fr auto;
  overflow: hidden;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  border-bottom: 1px solid var(--line);
  background: rgba(255,255,255,0.02);
}
.status-dot {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: var(--success);
  display: inline-block;
  margin-right: 10px;
  box-shadow: 0 0 18px rgba(41,211,145,0.6);
}
.topbar-actions { display: flex; gap: 10px; }
.ghost-btn {
  background: rgba(255,255,255,0.06);
  color: var(--text);
  padding: 12px 14px;
}
.ghost-btn:hover, .quick-btn:hover, .copy-btn:hover { background: rgba(255,255,255,0.12); }
.ghost-btn.danger { color: #ffd5dd; }

.messages {
  padding: 24px;
  overflow: auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.message-row {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
}
.message-row.user { grid-template-columns: minmax(0, 1fr) 48px; }
.message-row.user .avatar { order: 2; }
.message-row.user .message-bubble { order: 1; }
.avatar {
  width: 48px;
  height: 48px;
  border-radius: 18px;
  display: grid;
  place-items: center;
  font-weight: 800;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.06);
}
.message-row.assistant .avatar { background: linear-gradient(135deg, var(--primary), var(--primary-2)); }
.message-row.user .avatar { background: linear-gradient(135deg, #1f9d55, #23c483); }
.message-bubble {
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.03);
  border-radius: 24px;
  padding: 16px;
}
.message-row.user .message-bubble {
  background: rgba(35, 196, 131, 0.1);
}
.message-meta {
  font-size: 0.82rem;
  color: var(--muted);
  margin-bottom: 10px;
}
.message-content {
  white-space: pre-wrap;
  line-height: 1.8;
  word-wrap: break-word;
}
.message-actions { margin-top: 14px; display: flex; justify-content: flex-end; }
.copy-btn {
  background: rgba(255,255,255,0.06);
  color: var(--muted);
  padding: 8px 12px;
}

.composer-wrap {
  padding: 18px 20px 20px;
  border-top: 1px solid var(--line);
  background: rgba(255,255,255,0.02);
}
.quick-prompts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 14px;
}
.quick-btn {
  background: rgba(255,255,255,0.05);
  color: var(--text);
  padding: 10px 12px;
}
.composer {
  display: grid;
  grid-template-columns: 1fr 120px;
  gap: 12px;
}
#promptInput {
  min-height: 60px;
  max-height: 180px;
}
.send-btn { min-height: 60px; }
.footer-note {
  margin-top: 12px;
  font-size: 0.84rem;
  color: var(--muted);
}

.typing {
  opacity: 0.8;
  font-style: italic;
}

@media (max-width: 980px) {
  .app-shell { grid-template-columns: 1fr; }
  .chat-panel { min-height: 75vh; }
}

@media (max-width: 640px) {
  .app-shell { padding: 12px; gap: 12px; }
  .sidebar, .chat-panel { border-radius: 24px; }
  .topbar, .messages, .composer-wrap { padding-left: 16px; padding-right: 16px; }
  .composer { grid-template-columns: 1fr; }
  .send-btn { width: 100%; }
}