/* ============================================================
   Heathrow Helper — Chat Application
   ============================================================ */

body.app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
  background: var(--bg-page);
}

/* ============================================================
   1. HEADER (chat variant — has theme toggle, no back-link)
   ============================================================ */

.app-header {
  background: var(--brand-navy);
  color: var(--ink-inverse);
  padding: var(--space-3) var(--space-5);
  padding-top: max(var(--space-3), env(safe-area-inset-top, 0px));
  display: flex;
  align-items: center;
  gap: var(--space-4);
  position: relative;
  z-index: 10;
  flex-shrink: 0;
}
.app-header::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 2px;
  background: var(--brand-accent-2);
  opacity: 0.55;
}

.app-header__brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: inherit;
  min-width: 0;
}
.app-header__brand:hover { opacity: 1; text-decoration: none; }

.brand-glyph {
  width: 32px; height: 32px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-sm);
  background: rgba(201, 169, 110, 0.16);
  color: var(--brand-accent-2);
  flex-shrink: 0;
}
.brand-glyph svg { width: 18px; height: 18px; }

.brand-wordmark {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
  min-width: 0;
}
.brand-wordmark__name {
  font-size: var(--text-lg);
  font-weight: 600;
  letter-spacing: -0.01em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.brand-wordmark__sub {
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--brand-accent-2);
  margin-top: 3px;
}

.app-header__actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.icon-btn {
  width: 38px; height: 38px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-pill);
  color: var(--ink-inverse);
  background: rgba(255, 255, 255, 0.06);
  transition: background var(--dur-fast) var(--ease-out);
}
.icon-btn:hover { background: rgba(255, 255, 255, 0.14); }
.icon-btn svg { width: 18px; height: 18px; }
.icon-btn .icon-moon { display: none; }
:root[data-theme="dark"] .icon-btn .icon-sun { display: none; }
:root[data-theme="dark"] .icon-btn .icon-moon { display: block; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .icon-btn .icon-sun { display: none; }
  :root:not([data-theme="light"]) .icon-btn .icon-moon { display: block; }
}

/* ============================================================
   2. CHIP RAIL (primary + sub)
   ============================================================ */

.chip-rail-wrap {
  position: relative;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--line);
  flex-shrink: 0;
}
.chip-rail-wrap::before,
.chip-rail-wrap::after {
  content: "";
  position: absolute;
  top: 0; bottom: 0;
  width: 32px;
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--dur-base) var(--ease-out);
  z-index: 2;
}
.chip-rail-wrap::before {
  left: 0;
  background: linear-gradient(to right, var(--bg-surface), transparent);
}
.chip-rail-wrap::after {
  right: 0;
  background: linear-gradient(to left, var(--bg-surface), transparent);
}
.chip-rail-wrap.has-overflow-left::before { opacity: 1; }
.chip-rail-wrap.has-overflow-right::after { opacity: 1; }

.chip-rail {
  padding: var(--space-3) var(--space-4);
  display: flex;
  gap: var(--space-2);
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}
.chip-rail::-webkit-scrollbar { display: none; }

.chip {
  background: var(--bg-surface);
  border: 1px solid var(--line);
  color: var(--ink-body);
  padding: var(--space-2) var(--space-4);
  min-height: 40px;
  border-radius: var(--radius-pill);
  font-size: var(--text-sm);
  font-weight: 500;
  white-space: nowrap;
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out),
              color var(--dur-fast) var(--ease-out),
              transform var(--dur-fast) var(--ease-out);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.chip:hover {
  background: var(--bg-elev);
  border-color: var(--line-strong);
  transform: translateY(-1px);
}
.chip:active { transform: translateY(0); }
.chip.is-active {
  background: var(--brand-navy);
  border-color: var(--brand-navy);
  color: var(--ink-inverse);
}
.chip-icon { font-size: 14px; line-height: 1; }

/* Sub-chip rail (drills into a chip) */
.sub-rail {
  background: var(--bg-elev);
  border-bottom: 1px solid var(--line);
  padding: var(--space-3) var(--space-4);
  display: flex;
  gap: var(--space-2);
  align-items: center;
  overflow-x: auto;
  scrollbar-width: none;
  animation: sub-rail-in var(--dur-base) var(--ease-out) both;
  flex-shrink: 0;
}
.sub-rail.is-hidden { display: none; }
.sub-rail::-webkit-scrollbar { display: none; }

.sub-rail__label {
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  color: var(--ink-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-right: var(--space-2);
  white-space: nowrap;
  flex-shrink: 0;
}

.sub-chip {
  background: var(--bg-surface);
  border: 1px solid var(--line);
  color: var(--ink-strong);
  padding: 8px 14px;
  min-height: 36px;
  border-radius: var(--radius-pill);
  font-size: var(--text-sm);
  font-weight: 500;
  white-space: nowrap;
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out),
              color var(--dur-fast) var(--ease-out),
              transform var(--dur-fast) var(--ease-out);
  display: inline-flex;
  align-items: center;
}
.sub-chip:hover {
  background: var(--brand-navy);
  border-color: var(--brand-navy);
  color: var(--ink-inverse);
  transform: translateY(-1px);
}

.sub-rail__close {
  margin-left: auto;
  width: 32px; height: 32px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-pill);
  color: var(--ink-muted);
  flex-shrink: 0;
  transition: color var(--dur-fast) var(--ease-out),
              background var(--dur-fast) var(--ease-out);
}
.sub-rail__close:hover { color: var(--ink-strong); background: var(--bg-inset); }
.sub-rail__close svg { width: 14px; height: 14px; }

@keyframes sub-rail-in {
  from { opacity: 0; transform: translateY(-4px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ============================================================
   3. CHAT SCROLL CONTAINER
   ============================================================ */

.chat {
  flex: 1;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  position: relative;
  background: var(--bg-page);
}
.chat__inner {
  max-width: var(--container-chat);
  margin: 0 auto;
  width: 100%;
  padding: var(--space-6) var(--space-4) var(--space-7);
}

/* "Scroll to bottom" pill (appears when scrolled up) */
.scroll-bottom {
  position: absolute;
  bottom: var(--space-4);
  left: 50%;
  transform: translateX(-50%) translateY(8px);
  background: var(--bg-surface);
  border: 1px solid var(--line);
  color: var(--ink-strong);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-pill);
  font-size: var(--text-sm);
  font-weight: 500;
  box-shadow: var(--shadow-md);
  display: flex; align-items: center; gap: 6px;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur-base) var(--ease-out),
              transform var(--dur-base) var(--ease-out);
  z-index: 5;
}
.scroll-bottom.is-visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
  pointer-events: auto;
}
.scroll-bottom svg { width: 14px; height: 14px; }

/* ============================================================
   4. WELCOME STATE
   ============================================================ */

.welcome {
  animation: welcome-in var(--dur-slow) var(--ease-out) both;
}
@keyframes welcome-in {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.welcome__greeting {
  font-size: var(--text-2xl);
  font-weight: 600;
  color: var(--ink-strong);
  letter-spacing: -0.015em;
  margin-bottom: var(--space-2);
  animation: welcome-in var(--dur-slow) var(--ease-out) both;
  animation-delay: 50ms;
  opacity: 0;
}
.welcome__sub {
  font-size: var(--text-md);
  color: var(--ink-muted);
  margin-bottom: var(--space-6);
  animation: welcome-in var(--dur-slow) var(--ease-out) both;
  animation-delay: 120ms;
  opacity: 0;
}
.welcome__tiles {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}
.welcome-tile {
  background: var(--bg-surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  text-align: left;
  cursor: pointer;
  transition: border-color var(--dur-fast) var(--ease-out),
              box-shadow var(--dur-fast) var(--ease-out),
              transform var(--dur-fast) var(--ease-out);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  animation: welcome-in var(--dur-slow) var(--ease-out) both;
  opacity: 0;
}
.welcome-tile:nth-child(1) { animation-delay: 180ms; }
.welcome-tile:nth-child(2) { animation-delay: 230ms; }
.welcome-tile:nth-child(3) { animation-delay: 280ms; }
.welcome-tile:hover {
  border-color: var(--line-strong);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.welcome-tile__icon {
  width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-md);
  background: var(--brand-accent-soft);
  color: var(--brand-accent);
  font-size: 18px;
  margin-bottom: var(--space-2);
}
.welcome-tile__title {
  font-size: var(--text-md);
  font-weight: 600;
  color: var(--ink-strong);
  letter-spacing: -0.005em;
}
.welcome-tile__example {
  font-size: var(--text-sm);
  color: var(--ink-muted);
  line-height: var(--leading-snug);
}

.welcome__tip {
  font-size: var(--text-sm);
  color: var(--ink-muted);
  padding: var(--space-3) var(--space-4);
  background: var(--bg-elev);
  border-left: 2px solid var(--brand-accent-2);
  border-radius: var(--radius-md);
  animation: welcome-in var(--dur-slow) var(--ease-out) both;
  animation-delay: 340ms;
  opacity: 0;
}
.welcome__tip strong { color: var(--ink-strong); }

/* ============================================================
   5. MESSAGES
   ============================================================ */

.msg-group { margin-bottom: var(--space-5); }
.msg-group--user { display: flex; justify-content: flex-end; }
.msg-group--bot  { display: flex; gap: var(--space-3); }

.avatar {
  width: 32px; height: 32px;
  border-radius: var(--radius-pill);
  flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: var(--text-sm);
  font-weight: 600;
  background: var(--brand-navy);
  color: var(--ink-inverse);
  letter-spacing: -0.02em;
}
.avatar--spacer { visibility: hidden; }

.msg-stack {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  min-width: 0;
  max-width: 78%;
}
.msg-group--user .msg-stack { align-items: flex-end; }

.msg {
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-lg);
  font-size: var(--text-md);
  line-height: var(--leading-normal);
  word-wrap: break-word;
  position: relative;
  animation: msg-in var(--dur-base) var(--ease-out) both;
}
@keyframes msg-in {
  from { opacity: 0; transform: translateY(4px); }
  to   { opacity: 1; transform: translateY(0); }
}

.msg--bot {
  background: var(--bg-surface);
  color: var(--ink-body);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-xs);
}
.msg-group--bot .msg-stack > .msg--bot:first-child {
  border-top-left-radius: var(--space-1);
}

.msg--user {
  background: var(--brand-navy);
  color: var(--ink-inverse);
}
.msg-group--user .msg-stack > .msg--user:first-child {
  border-top-right-radius: var(--space-1);
}

.msg p { margin: 0 0 var(--space-2) 0; }
.msg p:last-child { margin-bottom: 0; }
.msg ul, .msg ol { margin: var(--space-2) 0; padding-left: var(--space-5); }
.msg li { margin-bottom: 4px; }
.msg strong { color: var(--ink-strong); font-weight: 600; }
.msg--user strong { color: var(--ink-inverse); }
.msg em { color: var(--ink-muted); font-style: normal; font-size: var(--text-sm); }
.msg--user em { color: rgba(245, 241, 234, 0.78); }
.msg code {
  background: var(--bg-inset);
  padding: 1px 6px;
  border-radius: var(--radius-sm);
  font-size: 0.92em;
  font-family: var(--font-mono);
}
.msg--user code { background: rgba(255, 255, 255, 0.14); color: var(--ink-inverse); }
.msg a { color: var(--brand-accent); text-decoration: underline; text-underline-offset: 2px; }
.msg--user a { color: var(--brand-accent-2); }

/* Message meta (timestamp + copy) — appears on hover/focus */
.msg-meta {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-2xs);
  color: var(--ink-subtle);
  opacity: 0;
  transition: opacity var(--dur-fast) var(--ease-out);
  padding: 2px var(--space-3);
}
.msg-group:hover .msg-meta,
.msg-group:focus-within .msg-meta { opacity: 1; }
.msg-meta__time { font-family: var(--font-mono); }
.msg-meta__copy {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  color: var(--ink-subtle);
  transition: color var(--dur-fast) var(--ease-out),
              background var(--dur-fast) var(--ease-out);
}
.msg-meta__copy:hover { color: var(--ink-strong); background: var(--bg-elev); }
.msg-meta__copy svg { width: 11px; height: 11px; }

/* ============================================================
   6. TYPING INDICATOR
   ============================================================ */

.typing {
  display: inline-flex;
  gap: 4px;
  background: var(--bg-surface);
  border: 1px solid var(--line);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-lg);
  border-top-left-radius: var(--space-1);
  box-shadow: var(--shadow-xs);
  animation: msg-in var(--dur-base) var(--ease-out);
}
.typing span {
  width: 6px; height: 6px;
  background: var(--ink-subtle);
  border-radius: 50%;
  animation: typing-bounce 1.4s infinite var(--ease-in-out);
}
.typing span:nth-child(2) { animation-delay: 0.18s; }
.typing span:nth-child(3) { animation-delay: 0.36s; }
@keyframes typing-bounce {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
  30%           { transform: translateY(-5px); opacity: 1; }
}

/* ============================================================
   7. FLIGHT CARD
   ============================================================ */

.flight-card {
  background: var(--bg-surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  box-shadow: var(--shadow-sm);
  animation: msg-in var(--dur-base) var(--ease-out) both;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.flight-card__head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-3);
}
.flight-card__title {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}
.flight-card__number {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: 500;
  color: var(--ink-strong);
  letter-spacing: 0.02em;
}
.flight-card__airline {
  font-size: var(--text-sm);
  color: var(--ink-muted);
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  white-space: nowrap;
  flex-shrink: 0;
}
.status-pill__dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: currentColor;
}
.status-pill[data-status="ontime"]    { background: var(--status-ontime-bg);    color: var(--status-ontime-fg); }
.status-pill[data-status="delayed"]   { background: var(--status-delayed-bg);   color: var(--status-delayed-fg); }
.status-pill[data-status="cancelled"] { background: var(--status-cancelled-bg); color: var(--status-cancelled-fg); }
.status-pill[data-status="boarding"]  { background: var(--status-boarding-bg);  color: var(--status-boarding-fg); }
.status-pill[data-status="landed"]    { background: var(--status-landed-bg);    color: var(--status-landed-fg); }
.status-pill[data-status="info"]      { background: var(--status-info-bg);      color: var(--status-info-fg); }
.status-pill[data-status="boarding"] .status-pill__dot,
.status-pill[data-status="delayed"]  .status-pill__dot {
  animation: pill-pulse 1.6s infinite var(--ease-in-out);
}
@keyframes pill-pulse {
  0%, 100% { opacity: 1; }
  50%      { opacity: 0.35; }
}

.flight-card__route {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) 0;
}
.route-endpoint { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.route-endpoint--to { text-align: right; }
.route-endpoint__iata {
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  font-weight: 500;
  color: var(--ink-strong);
  line-height: 1;
  letter-spacing: 0.02em;
}
.route-endpoint__city {
  font-size: var(--text-xs);
  color: var(--ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.route-line {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--brand-accent-2);
  font-size: 18px;
  position: relative;
}
.route-line::before,
.route-line::after {
  content: "";
  display: block;
  width: var(--space-5);
  height: 1px;
  background: var(--line-strong);
}
.route-line svg { width: 18px; height: 18px; margin: 0 6px; }

.flight-card--cancelled .route-endpoint__iata,
.flight-card--cancelled .route-endpoint__city {
  text-decoration: line-through;
  text-decoration-color: var(--ink-subtle);
  opacity: 0.7;
}

.flight-spec {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.flight-spec__cell {
  background: var(--bg-elev);
  padding: var(--space-3);
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}
.flight-spec__label {
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  color: var(--ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 500;
}
.flight-spec__value {
  font-family: var(--font-mono);
  font-size: var(--text-md);
  font-weight: 500;
  color: var(--ink-strong);
  letter-spacing: 0.02em;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.flight-spec__value--changed { color: var(--status-delayed-fg); }
.flight-spec__value--good    { color: var(--status-ontime-fg); }
.flight-spec__value--bad     { color: var(--status-cancelled-fg); }

.flight-card__foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  font-size: var(--text-xs);
  color: var(--ink-muted);
  border-top: 1px solid var(--line);
  padding-top: var(--space-3);
  margin-top: var(--space-1);
}
.flight-card__source {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.live-dot {
  width: 7px; height: 7px;
  background: var(--status-ontime-fg);
  border-radius: 50%;
  box-shadow: 0 0 0 0 currentColor;
  animation: live-pulse 2s infinite var(--ease-in-out);
}
@keyframes live-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(22, 101, 52, 0.5); }
  50%      { box-shadow: 0 0 0 5px rgba(22, 101, 52, 0); }
}

/* Cancellation variant — collapse spec table to a single banner */
.flight-card--cancelled .flight-spec {
  grid-template-columns: 1fr;
}
.flight-card--cancelled .flight-spec__cell {
  text-align: center;
  padding: var(--space-4);
}

/* Suggestion chips — context-aware follow-ups after a bot reply */
.suggestion-row {
  margin: var(--space-2) 0 var(--space-5);
  animation: msg-in var(--dur-base) var(--ease-out) both;
}
.suggestion-row__head {
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  color: var(--ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: var(--space-2);
  padding-left: var(--space-1);
}
.suggestion-row__list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}
.suggestion-chip {
  background: var(--bg-surface);
  border: 1px solid var(--line);
  color: var(--ink-strong);
  padding: 9px 14px;
  min-height: 38px;
  border-radius: var(--radius-pill);
  font-size: var(--text-sm);
  font-weight: 500;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  text-align: left;
  transition: background var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out),
              transform var(--dur-fast) var(--ease-out),
              box-shadow var(--dur-fast) var(--ease-out);
}
.suggestion-chip:hover {
  background: var(--bg-elev);
  border-color: var(--line-strong);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}
.suggestion-chip:active { transform: translateY(0); }

/* Landing-at-destination block — shows when user asks "when does X land" */
.flight-card__landing {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.flight-card__landing-head {
  display: flex;
  align-items: center;
  gap: 8px;
}
.flight-card__landing-icon {
  font-size: 18px;
  line-height: 1;
}
.flight-card__landing-title {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--ink-strong);
  letter-spacing: -0.005em;
}
.flight-card__landing-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2);
}
.flight-card__landing-cell {
  background: var(--bg-surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.flight-card__landing-note {
  font-size: var(--text-2xs);
  color: var(--ink-muted);
  line-height: var(--leading-snug);
}

/* ============================================================
   8. SKELETON FLIGHT CARD
   ============================================================ */

.skeleton-card {
  background: var(--bg-surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  animation: msg-in var(--dur-base) var(--ease-out);
}
.skeleton-bar {
  background: linear-gradient(
    90deg,
    var(--bg-inset) 0%,
    var(--bg-elev) 50%,
    var(--bg-inset) 100%
  );
  background-size: 200% 100%;
  border-radius: var(--radius-sm);
  animation: skeleton-shimmer 1.6s infinite linear;
  height: 14px;
}
@keyframes skeleton-shimmer {
  from { background-position: 200% 0; }
  to   { background-position: -200% 0; }
}
.skeleton-card__head { display: flex; justify-content: space-between; align-items: center; }
.skeleton-card__head .skeleton-bar:first-child { width: 130px; height: 20px; }
.skeleton-card__head .skeleton-bar:last-child  { width: 82px;  height: 22px; border-radius: var(--radius-pill); }
.skeleton-card__route { display: flex; justify-content: space-between; align-items: center; padding: var(--space-2) 0; }
.skeleton-card__route .skeleton-bar { width: 70px; height: 26px; }
.skeleton-card__route .skeleton-bar--mid { width: 36px; height: 14px; }
.skeleton-card__grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-2); }
.skeleton-card__grid .skeleton-bar { height: 38px; }

/* ============================================================
   9. ERROR CARD (with Retry)
   ============================================================ */

.error-card {
  background: var(--bg-surface);
  border: 1px solid var(--status-cancelled-fg);
  border-left-width: 3px;
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  display: flex;
  gap: var(--space-3);
  animation: msg-in var(--dur-base) var(--ease-out);
}
.error-card__icon {
  width: 32px; height: 32px;
  flex-shrink: 0;
  border-radius: var(--radius-pill);
  background: var(--status-cancelled-bg);
  color: var(--status-cancelled-fg);
  display: flex; align-items: center; justify-content: center;
}
.error-card__icon svg { width: 16px; height: 16px; }
.error-card__body { flex: 1; display: flex; flex-direction: column; gap: var(--space-2); }
.error-card__title {
  font-size: var(--text-md);
  font-weight: 600;
  color: var(--ink-strong);
}
.error-card__copy {
  font-size: var(--text-sm);
  color: var(--ink-muted);
}
.error-card__retry {
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: var(--space-2) var(--space-4);
  background: var(--brand-navy);
  color: var(--ink-inverse);
  border-radius: var(--radius-pill);
  font-size: var(--text-sm);
  font-weight: 500;
  transition: opacity var(--dur-fast) var(--ease-out);
  margin-top: var(--space-1);
}
.error-card__retry:hover { opacity: 0.86; }
.error-card__retry svg { width: 13px; height: 13px; }

/* ============================================================
   10. INPUT AREA
   ============================================================ */

.composer {
  background: var(--bg-surface);
  border-top: 1px solid var(--line);
  padding: var(--space-3) var(--space-4);
  padding-bottom: max(var(--space-3), var(--safe-bottom));
  flex-shrink: 0;
}
.composer__form {
  max-width: var(--container-chat);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.composer__input-wrap {
  position: relative;
  display: flex;
  align-items: center;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  padding: 4px 4px 4px var(--space-3);
  min-height: 50px;
  transition: border-color var(--dur-fast) var(--ease-out),
              background var(--dur-fast) var(--ease-out),
              box-shadow var(--dur-fast) var(--ease-out);
}
.composer__input-wrap:focus-within {
  border-color: var(--line-strong);
  background: var(--bg-surface);
  box-shadow: var(--shadow-sm);
}

.composer__mic {
  width: 40px; height: 40px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-pill);
  color: var(--ink-muted);
  flex-shrink: 0;
  transition: color var(--dur-fast) var(--ease-out),
              background var(--dur-fast) var(--ease-out);
}
.composer__mic:hover { color: var(--ink-strong); background: var(--bg-inset); }
.composer__mic.is-live {
  background: var(--brand-accent);
  color: var(--ink-inverse);
  animation: mic-pulse 1.2s infinite;
}
@keyframes mic-pulse {
  0%, 100% { box-shadow: 0 0 0 0 var(--brand-accent-soft); }
  50%      { box-shadow: 0 0 0 8px transparent; }
}
.composer__mic svg { width: 18px; height: 18px; }
.composer__mic:disabled { opacity: 0.35; cursor: not-allowed; }

.composer__input {
  flex: 1;
  font-size: var(--text-md);
  background: transparent;
  border: none;
  outline: none;
  padding: var(--space-2) var(--space-2);
  color: var(--ink-strong);
  min-width: 0;
}
.composer__input::placeholder { color: var(--ink-subtle); }

.composer__send {
  width: 40px; height: 40px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-pill);
  background: var(--brand-navy);
  color: var(--ink-inverse);
  flex-shrink: 0;
  transition: opacity var(--dur-fast) var(--ease-out),
              transform var(--dur-fast) var(--ease-out),
              background var(--dur-fast) var(--ease-out);
}
.composer__send:hover { opacity: 0.88; }
.composer__send:active { transform: scale(0.94); }
.composer__send:disabled {
  opacity: 0.3;
  cursor: not-allowed;
  background: var(--ink-subtle);
}
.composer__send svg { width: 16px; height: 16px; }

.composer__hint {
  font-size: var(--text-2xs);
  color: var(--ink-subtle);
  text-align: center;
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}
.composer__hint kbd {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  padding: 1px 5px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--ink-muted);
}

/* ============================================================
   11. APP FOOTER (very compact)
   ============================================================ */

.app-footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--line);
  padding: var(--space-2) var(--space-4);
  padding-bottom: max(var(--space-2), var(--safe-bottom));
  text-align: center;
  font-size: var(--text-2xs);
  color: var(--ink-subtle);
  flex-shrink: 0;
}
.app-footer a {
  color: var(--ink-muted);
  text-decoration: none;
  margin: 0 4px;
}
.app-footer a:hover { color: var(--ink-strong); text-decoration: underline; }
.app-footer strong { color: var(--ink-muted); font-weight: 600; }

/* ============================================================
   12. RESPONSIVE
   ============================================================ */

@media (max-width: 720px) {
  .welcome__tiles { grid-template-columns: 1fr; gap: var(--space-2); }
  .welcome-tile { padding: var(--space-4); }
  .flight-spec { grid-template-columns: repeat(2, 1fr); }
  .flight-card { padding: var(--space-4); }
}

@media (max-width: 480px) {
  .app-header { padding: var(--space-3) var(--space-4); }
  .brand-wordmark__sub { display: none; }
  .msg-stack { max-width: 88%; }
  .chat__inner { padding: var(--space-4) var(--space-3) var(--space-5); }
  .composer { padding-left: var(--space-3); padding-right: var(--space-3); }
  .composer__hint { display: none; }
  .route-endpoint__iata { font-size: var(--text-xl); }
}