:root {
  --bg: #0f1115;
  --panel: #171a21;
  --panel-2: #1f2430;
  --border: #2a3140;
  --text: #eceff4;
  --muted: #9aa4b2;
  --accent: #10a37f;
  --accent-hover: #0d8f6f;
  --user-bubble: #2b5278;
  --assistant-bubble: #2a2f3a;
  --danger: #ff6b6b;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Inter, Segoe UI, Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.app {
  display: grid;
  grid-template-columns: 280px 1fr;
  min-height: 100vh;
}

.sidebar {
  background: var(--panel);
  border-right: 1px solid var(--border);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

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

.brand-icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: var(--accent);
  display: grid;
  place-items: center;
  font-weight: 700;
}

.brand h1,
.chat-header h2 {
  margin: 0;
  font-size: 1.1rem;
}

.brand p,
.sidebar-note {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.5;
}

.secondary-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 10px;
  padding: 10px 14px;
  cursor: pointer;
}

.secondary-btn:hover {
  background: var(--panel-2);
}

.chat-panel {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.chat-header {
  padding: 18px 24px;
  border-bottom: 1px solid var(--border);
  background: rgba(15, 17, 21, 0.8);
  backdrop-filter: blur(8px);
}

.messages {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.message {
  display: flex;
  gap: 12px;
  max-width: 900px;
}

.message.user {
  margin-left: auto;
  flex-direction: row-reverse;
}

.avatar {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--panel-2);
  display: grid;
  place-items: center;
  font-size: 0.75rem;
  font-weight: 700;
  flex-shrink: 0;
}

.message.user .avatar {
  background: var(--user-bubble);
}

.bubble {
  background: var(--assistant-bubble);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 14px 16px;
  line-height: 1.6;
  white-space: pre-wrap;
}

.message.user .bubble {
  background: var(--user-bubble);
}

.sql-block {
  margin-top: 12px;
  padding: 12px;
  border-radius: 10px;
  background: #11151d;
  border: 1px solid var(--border);
  font-family: Consolas, Monaco, monospace;
  font-size: 0.9rem;
  overflow-x: auto;
}

.preview-table-wrap {
  margin-top: 12px;
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

th,
td {
  border: 1px solid var(--border);
  padding: 8px 10px;
  text-align: left;
}

th {
  background: #121722;
}

.download-btn {
  margin-top: 12px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 10px;
  padding: 10px 14px;
  cursor: pointer;
  font-weight: 600;
}

.download-btn:hover {
  background: var(--accent-hover);
}

.error-text {
  color: var(--danger);
}

.composer {
  display: flex;
  gap: 12px;
  padding: 18px 24px 24px;
  border-top: 1px solid var(--border);
  background: var(--panel);
}

#promptInput {
  flex: 1;
  resize: none;
  min-height: 52px;
  max-height: 180px;
  padding: 14px 16px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text);
  font: inherit;
}

#promptInput:focus {
  outline: 2px solid rgba(16, 163, 127, 0.35);
}

#sendBtn {
  width: 52px;
  height: 52px;
  border: none;
  border-radius: 14px;
  background: var(--accent);
  color: white;
  cursor: pointer;
  display: grid;
  place-items: center;
}

#sendBtn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.loading-dots::after {
  content: "...";
  animation: dots 1.2s steps(4, end) infinite;
}

@keyframes dots {
  0% { content: ""; }
  25% { content: "."; }
  50% { content: ".."; }
  75% { content: "..."; }
}

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

  .sidebar {
    display: none;
  }
}