:root {
  --bg: #1b1a18;
  --bg-surface: #222120;
  --text: #e8e3db;
  --text-secondary: #8a857b;
  --accent: #bfa474;
  --accent-dim: rgba(191, 164, 116, 0.1);

  --font: 'SF Pro Display', -apple-system, 'Segoe UI', system-ui, sans-serif;
  --line-height: 1.6;
  --radius: 16px;
  --transition: 140ms ease-out;
}

*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: var(--line-height);
  min-height: 100dvh;
  overflow-x: hidden;
}

#app {
  max-width: 428px;
  margin: 0 auto;
  min-height: 100dvh;
  position: relative;
}

.screen {
  padding: 0 28px;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  opacity: 0;
  transform: translateY(6px);
  transition: opacity var(--transition), transform var(--transition);
}

.screen.visible {
  opacity: 1;
  transform: translateY(0);
}

.btn {
  display: block;
  width: 100%;
  padding: 18px 28px;
  border: none;
  border-radius: var(--radius);
  font-family: var(--font);
  font-size: 1rem;
  font-weight: 400;
  letter-spacing: 0.015em;
  cursor: pointer;
  transition: opacity var(--transition), transform var(--transition);
  -webkit-appearance: none;
}

.btn:active {
  opacity: 0.72;
  transform: translateY(1px);
}

.btn-primary {
  background: var(--accent);
  color: var(--bg);
  font-weight: 450;
}

.btn-secondary {
  background: var(--accent-dim);
  color: var(--accent);
}

.btn + .btn {
  margin-top: 10px;
}

.chat-screen {
  padding: 0;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

.chat-header {
  padding: 20px 28px 16px;
  display: flex;
  align-items: center;
  gap: 16px;
}

.chat-back {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-family: var(--font);
  font-size: 1.125rem;
  cursor: pointer;
  padding: 4px 0;
  transition: opacity var(--transition);
}

.chat-back:active {
  opacity: 0.6;
}

.chat-header-title {
  font-size: 1rem;
  font-weight: 450;
  color: var(--text);
  letter-spacing: 0.01em;
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 8px 28px 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.chat-bubble {
  max-width: 78%;
  padding: 12px 16px;
  border-radius: 18px;
  font-size: 0.9375rem;
  line-height: 1.5;
  word-break: break-word;
}

.chat-bubble-guest {
  align-self: flex-end;
  background: var(--accent-dim);
  color: var(--text);
  border-bottom-right-radius: 6px;
}

.chat-bubble-concierge {
  align-self: flex-start;
  background: var(--bg-surface);
  color: var(--text-secondary);
  border-bottom-left-radius: 6px;
}

.chat-chips {
  display: flex;
  gap: 8px;
  padding: 10px 28px;
  overflow-x: auto;
  scrollbar-width: none;
}

.chat-chips::-webkit-scrollbar {
  display: none;
}

.chat-chip {
  flex-shrink: 0;
  padding: 10px 20px;
  border-radius: 100px;
  border: 1px solid rgba(191, 164, 116, 0.15);
  background: none;
  color: var(--accent);
  font-family: var(--font);
  font-size: 0.875rem;
  font-weight: 400;
  letter-spacing: 0.01em;
  cursor: pointer;
  white-space: nowrap;
  transition: opacity var(--transition);
}

.chat-chip:active {
  opacity: 0.6;
}

.chat-input-bar {
  display: flex;
  gap: 10px;
  padding: 12px 28px;
  padding-bottom: max(16px, env(safe-area-inset-bottom));
  background: var(--bg);
}

.chat-input {
  flex: 1;
  padding: 14px 18px;
  border-radius: var(--radius);
  border: 1px solid rgba(232, 227, 219, 0.06);
  background: var(--bg-surface);
  color: var(--text);
  font-family: var(--font);
  font-size: 0.9375rem;
  outline: none;
  -webkit-appearance: none;
  transition: border-color var(--transition);
}

.chat-input::placeholder {
  color: var(--text-secondary);
}

.chat-input:focus {
  border-color: rgba(191, 164, 116, 0.2);
}

.chat-send {
  padding: 14px 20px;
  border-radius: var(--radius);
  border: none;
  background: var(--accent);
  color: var(--bg);
  font-family: var(--font);
  font-size: 0.875rem;
  font-weight: 450;
  letter-spacing: 0.01em;
  cursor: pointer;
  transition: opacity var(--transition);
}

.chat-send:active {
  opacity: 0.72;
}