:root {
  --magenta: #E20074;
  --magenta-light: #fff0f6;
  --magenta-soft: #fce4f0;
  --magenta-glow: rgba(226, 0, 116, 0.08);
  --bg: #f7f7fb;
  --surface: #ffffff;
  --surface-alt: #f2f3f7;
  --text: #1a1a2e;
  --text-secondary: #6b7085;
  --border: #e8e9f0;
  --border-light: #f0f1f5;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.03);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.06), 0 1px 4px rgba(0,0,0,0.04);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.08), 0 2px 8px rgba(0,0,0,0.04);
  --radius: 16px;
  --radius-sm: 10px;
  --radius-xs: 6px;
  --font: 'DM Sans', -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --rag-accent: #4f46e5;
  --rag-bg: #eef2ff;
}

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

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── Top Bar ── */
.topbar {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 0 32px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.topbar-brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.topbar-logo {
  width: 36px;
  height: 36px;
  background: var(--magenta);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: -0.5px;
}

.topbar-title {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.2px;
}

.topbar-subtitle {
  font-size: 0.72rem;
  color: var(--text-secondary);
  margin-top: 1px;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.topbar-status {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  color: var(--text-secondary);
  padding: 6px 12px;
  background: var(--surface-alt);
  border-radius: 20px;
}

.status-dot {
  width: 7px;
  height: 7px;
  background: #22c55e;
  border-radius: 50%;
  animation: pulse-dot 2s ease infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* ── Main Layout ── */
.main-container {
  flex: 1;
  display: flex;
  padding: 24px;
  gap: 20px;
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
  height: calc(100vh - 60px);
}

/* ── Chat Panel (shared) ── */
.chat-panel {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid var(--border-light);
  transition: box-shadow 0.3s ease;
}

.chat-panel:hover {
  box-shadow: var(--shadow-lg);
}

/* ── Form Panel (Main) ── */
.form-panel {
  flex: 1;
  min-width: 0;
}

/* ── Panel Header ── */
.panel-header {
  padding: 20px 24px 16px;
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
}

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

.panel-icon {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.panel-icon.form {
  background: var(--magenta-light);
  color: var(--magenta);
}

.panel-icon.rag {
  background: var(--rag-bg);
  color: var(--rag-accent);
}

.panel-title {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.2px;
}

.panel-desc {
  font-size: 0.73rem;
  color: var(--text-secondary);
  margin-top: 2px;
}

/* ── Progress ── */
.progress-container {
  padding: 0 24px;
  padding-top: 12px;
}

.progress-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.progress-label {
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.progress-value {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--magenta);
  font-family: var(--font-mono);
}

.progress-track {
  height: 4px;
  background: var(--surface-alt);
  border-radius: 4px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--magenta), #ff3d9a);
  border-radius: 4px;
  width: 0%;
  transition: width 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── Messages Area ── */
.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  scroll-behavior: smooth;
}

.chat-messages::-webkit-scrollbar {
  width: 5px;
}

.chat-messages::-webkit-scrollbar-track {
  background: transparent;
}

.chat-messages::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 10px;
}

.message-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.message-sender {
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding-left: 2px;
}

.message-sender.bot { color: var(--text-secondary); }
.message-sender.user { color: var(--magenta); align-self: flex-end; }

.message {
  max-width: 85%;
  padding: 12px 16px;
  line-height: 1.6;
  font-size: 0.87rem;
  animation: msg-in 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.message.bot {
  background: var(--surface-alt);
  align-self: flex-start;
  border-radius: 4px var(--radius-sm) var(--radius-sm) var(--radius-sm);
  color: var(--text);
}

.message.user {
  background: var(--magenta);
  color: white;
  align-self: flex-end;
  border-radius: var(--radius-sm) 4px var(--radius-sm) var(--radius-sm);
}

@keyframes msg-in {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ── Typing Indicator ── */
.typing-indicator {
  display: flex;
  gap: 5px;
  padding: 14px 18px;
  background: var(--surface-alt);
  border-radius: 4px var(--radius-sm) var(--radius-sm) var(--radius-sm);
  width: fit-content;
  align-self: flex-start;
  animation: msg-in 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.typing-indicator span {
  width: 7px;
  height: 7px;
  background: #b0b5c5;
  border-radius: 50%;
  animation: typing-bounce 1.4s ease infinite;
}

.typing-indicator span:nth-child(2) { animation-delay: 0.15s; }
.typing-indicator span:nth-child(3) { animation-delay: 0.3s; }

@keyframes typing-bounce {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
  30% { transform: translateY(-6px); opacity: 1; }
}

/* ── Input Area ── */
.chat-input-area {
  padding: 16px 20px;
  border-top: 1px solid var(--border-light);
  display: flex;
  gap: 10px;
  align-items: center;
  background: var(--surface);
}

.chat-input-area input {
  flex: 1;
  padding: 12px 18px;
  border: 1.5px solid var(--border);
  border-radius: 28px;
  outline: none;
  font-size: 0.85rem;
  font-family: var(--font);
  color: var(--text);
  background: var(--surface);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.chat-input-area input::placeholder {
  color: #b0b5c5;
}

.chat-input-area input:focus {
  border-color: var(--magenta);
  box-shadow: 0 0 0 3px var(--magenta-glow);
}

.send-btn {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: none;
  background: var(--magenta);
  color: white;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.15s, background 0.2s, box-shadow 0.2s;
  flex-shrink: 0;
}

.send-btn:hover {
  background: #c90066;
  transform: scale(1.05);
  box-shadow: 0 4px 12px rgba(226, 0, 116, 0.3);
}

.send-btn:active { transform: scale(0.95); }

.send-btn:disabled {
  background: var(--border);
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.send-btn svg {
  width: 18px;
  height: 18px;
}

.send-btn.rag-send {
  background: var(--rag-accent);
}

.send-btn.rag-send:hover {
  background: #4338ca;
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
}

/* ── RAG Toggle Button ── */
.rag-toggle-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: 28px;
  cursor: pointer;
  font-family: var(--font);
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all 0.25s ease;
  white-space: nowrap;
}

.rag-toggle-btn:hover {
  border-color: var(--rag-accent);
  color: var(--rag-accent);
  background: var(--rag-bg);
}

.rag-toggle-btn.active {
  border-color: var(--rag-accent);
  color: var(--rag-accent);
  background: var(--rag-bg);
}

.rag-toggle-icon {
  width: 18px;
  height: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ── RAG Panel ── */
.rag-panel {
  width: 0;
  min-width: 0;
  opacity: 0;
  overflow: hidden;
  transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1),
              min-width 0.4s cubic-bezier(0.4, 0, 0.2, 1),
              opacity 0.3s ease;
}

.rag-panel.open {
  width: 420px;
  min-width: 420px;
  opacity: 1;
}

.rag-panel .chat-panel {
  height: 100%;
  border: 1.5px solid #ddd8ff;
}

.rag-close-btn {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: all 0.15s;
}

.rag-close-btn:hover {
  background: var(--surface-alt);
  color: var(--text);
}

/* ── Welcome State ── */
.welcome-state {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px;
  text-align: center;
  gap: 16px;
}

.welcome-icon {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 4px;
}

.welcome-icon.rag-welcome { background: var(--rag-bg); }

.welcome-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
}

.welcome-desc {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.5;
  max-width: 280px;
}

.welcome-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin-top: 8px;
}

.welcome-chip {
  padding: 8px 14px;
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 0.76rem;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s;
  font-family: var(--font);
}

.welcome-chip:hover {
  background: var(--rag-bg);
  border-color: var(--rag-accent);
  color: var(--rag-accent);
}

/* ── Form Welcome Start Button ── */
.start-form-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  background: var(--magenta);
  color: white;
  border: none;
  border-radius: 28px;
  font-size: 0.88rem;
  font-weight: 600;
  font-family: var(--font);
  cursor: pointer;
  margin-top: 8px;
  transition: background 0.2s, transform 0.15s, box-shadow 0.2s;
}
.start-form-btn:hover {
  background: #c90066;
  transform: scale(1.03);
  box-shadow: 0 6px 20px rgba(226, 0, 116, 0.3);
}
.start-form-btn:active { transform: scale(0.97); }

/* ── Markdown content inside bot messages ── */
.message.bot ul,
.message.bot ol { padding-left: 1.4em; margin: 0.4em 0; }
.message.bot li { margin: 0.2em 0; }
.message.bot p { margin: 0.4em 0; }
.message.bot p:first-child { margin-top: 0; }
.message.bot p:last-child { margin-bottom: 0; }
.message.bot code {
  font-family: var(--font-mono);
  background: rgba(0,0,0,0.06);
  padding: 2px 5px;
  border-radius: 4px;
  font-size: 0.82em;
}
.message.bot pre {
  background: rgba(0,0,0,0.06);
  padding: 10px 14px;
  border-radius: 8px;
  overflow-x: auto;
  margin: 0.5em 0;
}
.message.bot pre code { background: none; padding: 0; }
.message.bot strong { font-weight: 600; }
.message.bot a { color: var(--magenta); }
.message.bot h1, .message.bot h2, .message.bot h3 {
  font-size: 0.95rem;
  font-weight: 600;
  margin: 0.6em 0 0.3em;
}

/* ── PDF Link ── */
.pdf-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--magenta);
  text-decoration: none;
  font-weight: 500;
  padding: 8px 14px;
  background: var(--magenta-light);
  border-radius: 8px;
  margin-top: 6px;
  transition: background 0.2s;
}

.pdf-link:hover {
  background: var(--magenta-soft);
}

/* ── Responsive ── */
@media (max-width: 900px) {
  .main-container { padding: 12px; gap: 12px; }
  .rag-panel.open { width: 320px; min-width: 320px; }
  .topbar { padding: 0 16px; }
}

@media (max-width: 640px) {
  .main-container {
    flex-direction: column;
    height: auto;
    min-height: calc(100vh - 60px);
  }
  .form-panel { min-height: 60vh; }
  .rag-panel.open {
    width: 100%;
    min-width: 100%;
    min-height: 50vh;
  }
}