:root {
  --bg: #f2ede4;
  --panel: #fffdf9;
  --panel-border: #e5ddd0;
  --text: #1e2a2e;
  --muted: #6b7880;
  --accent: #256d5a;
  --accent-hover: #1d5a4b;
  --accent-soft: #dff2eb;
  --user-bubble: #256d5a;
  --user-text: #ffffff;
  --bot-bubble: #f5f0e8;
  --bot-border: #e5ddd0;
  --system-bubble: #fef9ee;
  --danger: #c0392b;
  --shadow: 0 20px 60px rgba(37, 109, 90, 0.12);
  --radius: 28px;
}

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

body {
  min-height: 100vh;
  font-family: "Segoe UI", "Noto Sans Bengali", "Inter", system-ui, sans-serif;
  background:
    radial-gradient(ellipse at top left, rgba(223, 242, 235, 0.7) 0%, transparent 50%),
    radial-gradient(ellipse at bottom right, rgba(37, 109, 90, 0.06) 0%, transparent 50%),
    linear-gradient(160deg, #f8f4ec 0%, var(--bg) 100%);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
}

.app-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 20px;
}

.chat-card {
  width: min(100%, 860px);
  height: min(94vh, 840px);
  background: rgba(255, 253, 249, 0.96);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  backdrop-filter: blur(20px);
}

/* Header */
.chat-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  padding: 22px 24px 18px;
  border-bottom: 1px solid var(--panel-border);
  flex-shrink: 0;
}

.eyebrow {
  color: var(--accent);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-bottom: 4px;
}

.chat-header h1 {
  font-size: clamp(1.3rem, 2.5vw, 1.75rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--text);
}

.header-sub {
  margin-top: 4px;
  font-size: 12px;
  color: var(--muted);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.icon-button {
  background: var(--bg);
  border: 1px solid var(--panel-border);
  border-radius: 12px;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 16px;
  transition: background 0.15s, border-color 0.15s;
  color: var(--muted);
}
.icon-button:hover { background: var(--accent-soft); border-color: var(--accent); color: var(--accent); }

.ghost-button {
  background: transparent;
  border: 1px solid var(--panel-border);
  border-radius: 14px;
  padding: 7px 14px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  color: var(--muted);
  transition: all 0.15s;
  white-space: nowrap;
}
.ghost-button:hover { background: #fdf2ef; border-color: #e0a090; color: #c0392b; }

/* Settings Panel */
.settings-panel {
  padding: 14px 24px;
  background: rgba(242, 237, 228, 0.5);
  border-bottom: 1px solid var(--panel-border);
  flex-shrink: 0;
}
.settings-panel.hidden { display: none; }

.config-field span {
  font-size: 11px;
  font-weight: 700;
  color: var(--muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  display: block;
  margin-bottom: 6px;
}

.config-input-row {
  display: flex;
  gap: 8px;
}

.config-input-row input {
  flex: 1;
  border: 1px solid #d7ccb8;
  border-radius: 12px;
  padding: 8px 14px;
  font-size: 13px;
  background: white;
  outline: none;
  transition: border-color 0.15s;
}
.config-input-row input:focus { border-color: var(--accent); }

.save-btn {
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 12px;
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
  white-space: nowrap;
}
.save-btn:hover { background: var(--accent-hover); }

/* 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: rgba(0,0,0,0.1); border-radius: 10px; }

/* Messages */
.message {
  display: flex;
  align-items: flex-end;
  gap: 10px;
  max-width: 82%;
  animation: msgIn 0.2s ease-out;
}

@keyframes msgIn {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

.message.user { align-self: flex-end; flex-direction: row-reverse; }
.message.bot  { align-self: flex-start; }
.message.system { align-self: center; max-width: 90%; }

.avatar {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
}

.message.bot .avatar {
  background: var(--accent-soft);
  border: 1px solid rgba(37, 109, 90, 0.15);
}
.message.bot .avatar::after { content: '⚕'; }

.message.user .avatar {
  background: linear-gradient(135deg, #256d5a, #1d5a4b);
}
.message.user .avatar::after { content: '👤'; font-size: 12px; }

.message.system .avatar { display: none; }

.bubble-wrap { display: flex; flex-direction: column; gap: 4px; }
.message.user .bubble-wrap { align-items: flex-end; }

.bubble {
  padding: 11px 15px;
  border-radius: 18px;
  font-size: 14px;
  line-height: 1.6;
  word-break: break-word;
}

.message.user .bubble {
  background: var(--user-bubble);
  color: var(--user-text);
  border-bottom-right-radius: 5px;
}

.message.bot .bubble {
  background: var(--bot-bubble);
  color: var(--text);
  border: 1px solid var(--bot-border);
  border-bottom-left-radius: 5px;
}

.message.system .bubble {
  background: var(--system-bubble);
  color: var(--muted);
  font-size: 12.5px;
  border: 1px solid #ede4c8;
  border-radius: 14px;
  text-align: center;
  padding: 8px 16px;
}

/* Markdown inside bubbles */
.bubble strong { font-weight: 700; }
.bubble em { font-style: italic; }
.bubble code {
  font-family: monospace;
  background: rgba(0,0,0,0.07);
  border-radius: 4px;
  padding: 1px 5px;
  font-size: 12.5px;
}
.message.user .bubble code { background: rgba(255,255,255,0.2); }
.bubble ul, .bubble ol { margin: 6px 0 6px 18px; }
.bubble li { margin-bottom: 3px; }
.bubble p + p { margin-top: 8px; }

/* Msg meta (timestamp + copy) */
.msg-meta {
  display: flex;
  align-items: center;
  gap: 6px;
  opacity: 0;
  transition: opacity 0.15s;
}
.message:hover .msg-meta { opacity: 1; }
.message.system .msg-meta { display: none; }

.timestamp {
  font-size: 11px;
  color: var(--muted);
}

.copy-btn {
  background: none;
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  padding: 2px 7px;
  font-size: 11px;
  cursor: pointer;
  color: var(--muted);
  transition: all 0.15s;
  line-height: 1.5;
}
.copy-btn:hover { background: var(--accent-soft); color: var(--accent); border-color: var(--accent); }
.copy-btn.copied { color: var(--accent); border-color: var(--accent); background: var(--accent-soft); }

/* Typing Indicator */
.typing-dots {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 0;
}
.typing-dots span {
  width: 7px;
  height: 7px;
  background: var(--accent);
  border-radius: 50%;
  opacity: 0.5;
  animation: bounce 1.2s infinite;
}
.typing-dots span:nth-child(2) { animation-delay: 0.2s; }
.typing-dots span:nth-child(3) { animation-delay: 0.4s; }

@keyframes bounce {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.5; }
  30% { transform: translateY(-5px); opacity: 1; }
}

/* Input Row */
.chat-input-row {
  display: flex;
  align-items: flex-end;
  gap: 10px;
  padding: 16px 20px;
  border-top: 1px solid var(--panel-border);
  background: rgba(255, 253, 249, 0.9);
  flex-shrink: 0;
}

.message-input {
  flex: 1;
  border: 1.5px solid #d7ccb8;
  border-radius: 18px;
  padding: 11px 16px;
  font-size: 14px;
  font-family: inherit;
  background: white;
  outline: none;
  resize: none;
  min-height: 44px;
  max-height: 130px;
  overflow-y: auto;
  transition: border-color 0.15s, box-shadow 0.15s;
  line-height: 1.5;
}

.message-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(37, 109, 90, 0.1);
}
.message-input:disabled { opacity: 0.6; }

.message-input::-webkit-scrollbar { width: 4px; }
.message-input::-webkit-scrollbar-thumb { background: #d7ccb8; border-radius: 4px; }

.send-button {
  width: 44px;
  height: 44px;
  border-radius: 14px;
  border: none;
  background: var(--accent);
  color: white;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background 0.15s, transform 0.1s;
}
.send-button:hover:not(:disabled) { background: var(--accent-hover); transform: scale(1.04); }
.send-button:active:not(:disabled) { transform: scale(0.96); }
.send-button:disabled { opacity: 0.5; cursor: not-allowed; }

@media (max-width: 600px) {
  .app-shell { padding: 0; }
  .chat-card { width: 100%; height: 100vh; border-radius: 0; border: none; }
  .chat-header { padding: 16px; }
  .chat-messages { padding: 14px 16px; }
  .chat-input-row { padding: 12px 14px; }
}