:root {
  --bg-app: #131316;
  --bg-sidebar: #18181c;
  --bg-main: #1a1a1f;
  --bg-bubble-user: #241a2e;
  --bg-bubble-bot: #1e1e24;
  --border: #2d2a35;
  --text-primary: #f5f4f8;
  --text-secondary: #a6a3b3;
  --text-muted: #66636f;
  --accent: #E72B99;
  --accent-2: #6953FF;
  --accent-3: #9229F7;
  --accent-dim: #5a2a5f;
  --gradient: linear-gradient(135deg, var(--accent-2), var(--accent));
  --danger: #ff5c5c;
  --radius: 10px;
  --font-ui: 'Poppins', 'Inter', -apple-system, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: var(--font-ui);
  background: var(--bg-app);
  color: var(--text-primary);
  height: 100vh;
  overflow: hidden;
}

.app {
  display: flex;
  height: 100vh;
}

/* ===== Sidebar ===== */
.sidebar {
  width: 272px;
  flex-shrink: 0;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 14px;
}

.new-chat-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 11px 14px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-primary);
  font-family: var(--font-ui);
  font-size: 0.88rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}
.new-chat-btn:hover { background: #201c28; border-color: var(--accent-3); }
.new-chat-btn .plus {
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-size: 1.1rem;
  font-weight: 700;
}

.conversations {
  flex: 1;
  overflow-y: auto;
  margin-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.conv-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 9px 10px;
  border-radius: 8px;
  font-size: 0.84rem;
  color: var(--text-secondary);
  cursor: pointer;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.conv-item:hover { background: #201c26; color: var(--text-primary); }
.conv-item.active {
  background: linear-gradient(135deg, rgba(105, 83, 255, 0.16), rgba(231, 43, 153, 0.16));
  color: var(--text-primary);
  border: 1px solid var(--accent-3);
}
.conv-item .title { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; flex: 1; }
.conv-item .del-btn {
  opacity: 0;
  color: var(--text-muted);
  font-size: 0.75rem;
  background: none;
  border: none;
  cursor: pointer;
  flex-shrink: 0;
}
.conv-item:hover .del-btn { opacity: 1; }
.conv-item .del-btn:hover { color: var(--danger); }

.sidebar-footer {
  border-top: 1px solid var(--border);
  padding-top: 12px;
  margin-top: 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
}
.badge-local {
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-weight: 700;
  letter-spacing: 0.02em;
}

/* ===== Main ===== */
.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.chat-header {
  padding: 16px 28px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: baseline;
  gap: 10px;
  background: var(--bg-main);
}
.chat-title {
  font-weight: 800;
  font-size: 1.05rem;
  letter-spacing: 0.03em;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.chat-sub { font-family: var(--font-mono); font-size: 0.72rem; color: var(--text-muted); }

.messages {
  flex: 1;
  overflow-y: auto;
  padding: 28px 0 12px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  background: var(--bg-main);
}

.empty-state {
  margin: auto;
  text-align: center;
  max-width: 420px;
  color: var(--text-secondary);
}
.empty-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: var(--gradient);
  box-shadow: 0 0 24px rgba(231, 43, 153, 0.35);
  color: #ffffff;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 1.4rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 14px;
}
.empty-state h2 { color: var(--text-primary); font-size: 1.2rem; margin-bottom: 8px; }
.empty-state p { font-size: 0.88rem; line-height: 1.5; }

.msg-row {
  display: flex;
  padding: 0 24px;
}
.msg-row.user { justify-content: flex-end; }
.msg-row.assistant { justify-content: flex-start; }

.bubble {
  max-width: 68%;
  padding: 12px 15px;
  border-radius: var(--radius);
  font-size: 0.92rem;
  line-height: 1.5;
  white-space: pre-wrap;
  word-wrap: break-word;
}
.msg-row.user .bubble {
  background: var(--bg-bubble-user);
  border: 1px solid var(--accent-dim);
  border-bottom-right-radius: 2px;
}
.msg-row.assistant .bubble {
  background: var(--bg-bubble-bot);
  border: 1px solid var(--border);
  border-bottom-left-radius: 2px;
}

.msg-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-muted);
}
.msg-meta .intent-tag {
  background: #241a28;
  border: 1px solid var(--accent-3);
  color: #c98af0;
  padding: 1px 7px;
  border-radius: 20px;
}
.msg-meta .intent-tag.source-llm {
  background: #29192a;
  border-color: var(--accent);
  color: #f568bf;
  font-weight: 600;
}
.msg-meta .intent-tag.source-template {
  background: #201f16;
  border-color: #6b5d2f;
  color: #c9ab5c;
}
.feedback-btns { display: flex; gap: 6px; }
.feedback-btns button {
  background: none;
  border: 1px solid transparent;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 0.82rem;
  padding: 1px 5px;
  border-radius: 5px;
}
.feedback-btns button:hover { border-color: var(--border); color: var(--text-primary); }
.feedback-btns button.active-up { color: var(--accent-2); border-color: var(--accent-2); }
.feedback-btns button.active-down { color: var(--danger); border-color: var(--danger); }

.typing {
  display: flex;
  gap: 4px;
  padding: 14px 15px;
}
.typing span {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent-3);
  animation: blink 1.2s infinite ease-in-out;
}
.typing span:nth-child(2) { animation-delay: 0.2s; }
.typing span:nth-child(3) { animation-delay: 0.4s; }
@keyframes blink { 0%, 80%, 100% { opacity: 0.25; } 40% { opacity: 1; } }

/* ===== Composer ===== */
.composer {
  display: flex;
  align-items: flex-end;
  gap: 10px;
  padding: 14px 24px 20px;
  background: var(--bg-main);
  border-top: 1px solid var(--border);
}
.composer textarea {
  flex: 1;
  resize: none;
  background: var(--bg-bubble-bot);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-family: var(--font-ui);
  font-size: 0.92rem;
  padding: 12px 14px;
  max-height: 160px;
  line-height: 1.4;
}
.composer textarea:focus { outline: none; border-color: var(--accent-3); }
.composer button {
  width: 42px; height: 42px;
  border-radius: 10px;
  border: none;
  background: var(--gradient);
  color: #ffffff;
  font-size: 1rem;
  cursor: pointer;
  flex-shrink: 0;
  transition: filter 0.15s, transform 0.1s;
}
.composer button:hover { filter: brightness(1.15); }
.composer button:active { transform: scale(0.94); }
.composer button:disabled { background: var(--border); color: var(--text-muted); cursor: default; filter: none; }

/* scrollbars */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-thumb { background: #2a2632; border-radius: 8px; }
::-webkit-scrollbar-track { background: transparent; }

@media (max-width: 720px) {
  .sidebar { position: absolute; z-index: 5; height: 100%; transform: translateX(-100%); transition: transform 0.2s; }
  .sidebar.open { transform: translateX(0); }
  .bubble { max-width: 88%; }
}