/* Light, monochrome reference-led art direction, built with native CSS. Not a third-party design system.
   Shell: <=1199px max720; >=1200px max1200. 680px keeps the existing JS pane switch.
   Layers: shell0, navigation7, dialogs10, persona30. Map layers stay in their own context. */
:root {
  color-scheme: light;
  --canvas: #f0f1f4;
  --surface: #ffffff;
  --surface-raised: #f4f4f6;
  --surface-soft: #f8f8fa;
  --ink: #17181b;
  --muted: #696c74;
  --line: #e3e4e8;
  --accent: #3d36ed;
  --accent-ink: #ffffff;
  --radius-card: 24px;
  --radius-control: 14px;
  font-family: "Avenir Next", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  background: var(--canvas);
  color: var(--ink);
  font-synthesis: none;
}
html { min-height: 100%; background: var(--canvas); }
body { background: var(--canvas); }
button, input, textarea { font-family: inherit; }
button { -webkit-tap-highlight-color: transparent; touch-action: manipulation; }
button, label[for="routeFile"] { transition: background .18s, border-color .18s, color .18s, transform .18s; }
button:active:not(:disabled), label[for="routeFile"]:active { transform: scale(.98); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; }
input, textarea { caret-color: var(--accent); }
::selection { background: var(--accent); color: var(--accent-ink); }
* { scrollbar-width: thin; scrollbar-color: #c4c6ce transparent; }
.app-shell {
  isolation: isolate;
  position: relative;
  width: min(720px, calc(100% - 32px));
  height: calc(100vh - 32px);
  height: calc(100dvh - 32px);
  max-height: 1040px;
  min-height: 0;
  margin: 16px auto;
  border: 1px solid var(--line);
  border-radius: 28px;
  background: var(--surface);
  box-shadow: none;
  grid-template-columns: 64px 240px minmax(0, 1fr);
}
.app-shell.mode-agent, .app-shell.mode-route { grid-template-columns: 64px minmax(0, 1fr); }
.main { background: var(--surface); min-height: 0; }
.rail { padding: 26px 0 20px; background: #fafafb; border-right: 1px solid var(--line); color: var(--ink); }
.brand-mark { border-color: var(--line); color: var(--ink); border-radius: 14px; width: 40px; height: 42px; }
.rail-button { width: 46px; height: 50px; border-radius: 16px; background: transparent; color: var(--muted); margin-top: 12px; }
.rail-button:first-of-type { margin-top: 48px; }
.rail-button svg { width: 25px; height: 25px; }
.rail-button.active, .rail-button.active:hover { background: #1b1c20; color: #fafafa; transform: none; }
.rail-button:hover { background: var(--surface-raised); color: var(--ink); }
.rail-profile { padding: 4px; width: 48px; height: 48px; border: 1px solid var(--line); border-radius: 50%; background: var(--surface-raised); }
.rail-avatar { width: 38px; height: 38px; background: var(--surface-soft); color: var(--accent); }
.ui-icon { width: 24px; height: 24px; flex: none; fill: currentColor; }

/* Agent. Single flowing column below1200; desktop splits a working area and photo. */
.assistant-screen { background: var(--surface); color: var(--ink); }
.assistant-screen::before { display: none; }
.assistant-screen:not(.is-chatting) { display: flex; flex-direction: column; overflow-y: auto; padding: 0 28px 18px; }
.assistant-header { z-index: auto; height: 76px; padding: 0; border-bottom: 1px solid var(--line); gap: 14px; justify-content: flex-start; }
.assistant-brand { gap: 10px; }
.assistant-brand strong { font-size: 15px; font-weight: 650; letter-spacing: -.035em; }
.assistant-brand-mark { width: 32px; height: 32px; font-size: 21px; background: #1b1c20; color: #fafafa; border-radius: 10px; }
.assistant-status { gap: 8px; font-size: 12px; color: var(--muted); margin-left: auto; }
.assistant-status>span { color: var(--accent); font-size: 22px; }
.assistant-welcome { z-index: auto; flex: none; display: block; text-align: left; min-height: 0; padding: 27px 0 24px; }
.assistant-kicker { font-size: 12px; letter-spacing: .06em; color: var(--muted); margin: 0 0 12px; font-weight: 600; }
.assistant-welcome h1 { color: var(--ink); font-size: clamp(36px, 5.8vw, 48px); line-height: 1.18; letter-spacing: -.07em; font-weight: 750; }
.assistant-welcome h1>span { color: #a3a5ad; }
.desktop-title-break { display: none; }
.assistant-subtitle { color: var(--muted); font-size: 14px; line-height: 1.8; margin-top: 13px; max-width: 34em; }
.mobile-break { display: none; }
.expedition-visual {
  position: relative;
  flex: none;
  height: 238px;
  margin: 0 0 20px;
  isolation: isolate;
  overflow: hidden;
  border-radius: var(--radius-card);
  background: #dadbe0;
}
.expedition-visual::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, transparent 30%, #0d130eaa); pointer-events: none; }
.expedition-visual>img { display: block; width: 100%; height: 100%; object-fit: cover; object-position: 70% 55%; filter: grayscale(1) contrast(1.04); }
.expedition-visual figcaption { position: absolute; inset: auto auto 24px 24px; z-index: 1; display: flex; flex-direction: column; font-size: 15px; line-height: 1.5; color: #f8faef; }
.expedition-visual figcaption strong { font-size: 36px; letter-spacing: -.05em; font-weight: 650; }
.expedition-compass { position: absolute; right: 24px; bottom: 24px; z-index: 1; width: 46px; height: 46px; display: grid; place-items: center; border: 1px solid #f4f6ee77; border-radius: 50%; color: #f4f6ee; font-size: 30px; }
.assistant-composer { z-index: auto; flex: none; width: 100%; margin: 0; padding: 20px 21px 17px; border: 1px solid #1c1d21; border-radius: var(--radius-card); background: #1c1d21; color: #f6f6f9; box-shadow: none; will-change: auto; }
.assistant-composer:focus-within { border-color: #7773f5; box-shadow: 0 0 0 3px #3d36ed15; }
.composer-caption { color: #c0c2cb; display: block; font-size: 12px; font-weight: 700; letter-spacing: .03em; margin-bottom: 9px; }
.assistant-composer textarea { color: #f6f6f9; font-size: 17px; line-height: 1.6; min-height: 79px; max-height: 160px; resize: none; padding: 0 0 12px; caret-color: #f6f6f9; }
.assistant-composer textarea::placeholder { color: #cbced9; opacity: 1; }
.assistant-composer-bottom { border-top: 1px solid #ffffff25; padding-top: 12px; gap: 8px; }
.assistant-location-option { gap: 6px; color: #c5c7d1; font-size: 12px; min-height: 44px; white-space: nowrap; }
.assistant-location-option input { accent-color: var(--accent); width: 16px; height: 16px; }
.assistant-location-option small { font-size: 10px; color: #b4b7c3; }
.assistant-send { min-height: 46px; padding: 0 16px; gap: 10px; border-radius: 999px; background: var(--accent); color: var(--accent-ink); font-size: 14px; font-weight: 600; white-space: nowrap; }
.assistant-send:hover { background: #2d28ca; transform: none; }
.assistant-send span { display: flex; align-items: center; font-size: 23px; }
.assistant-suggestions { z-index: auto; flex: none; width: 100%; display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); margin: 12px 0 0; gap: 8px; }
.assistant-suggestions button { display: flex; align-items: flex-start; justify-content: space-between; flex-direction: row-reverse; min-width: 0; min-height: 80px; padding: 13px 12px; border: 1px solid var(--line); border-radius: 16px; background: var(--surface-soft); color: var(--ink); font-size: 13px; text-align: left; line-height: 1.6; }
.assistant-suggestions button:hover { background: var(--surface-raised); border-color: #aaa7f3; transform: translateY(-2px); }
.suggestion-symbol { color: var(--accent); font-size: 19px; line-height: 1.1; }
.suggestion-detail { display: block; color: var(--muted); font-size: 11px; margin-top: 2px; }
.assistant-tail { z-index: auto; flex: none; min-height: 0; padding: 15px 0 2px; text-align: left; justify-content: flex-start; }
.assistant-tail p { color: var(--muted); font-size: 11px; line-height: 1.7; letter-spacing: 0; }

/* The conversation stays a real scrollable application, using the original API. */
.assistant-screen.is-chatting { display: flex; padding: 0 28px; }
.assistant-screen.is-chatting .expedition-visual { display: none; }
.assistant-thread { padding: 28px 0 12px; width: 100%; }
.assistant-screen.is-chatting .assistant-composer { margin: 0 auto 20px; border-radius: 20px; padding: 16px 20px 13px; }
.assistant-screen.is-chatting .composer-caption { display: none; }
.assistant-screen.is-chatting .assistant-composer textarea { font-size: 16px; }
.assistant-message { gap: 10px; }
.assistant-message-avatar { background: var(--accent); color: var(--accent-ink); border-radius: 12px; }
.assistant-message.user .assistant-message-avatar { background: var(--surface-raised); color: var(--ink); }
.assistant-message-meta { color: var(--muted); font-size: 12px; }
.assistant-message-bubble { color: var(--ink); background: var(--surface-raised); border-color: var(--line); box-shadow: none; border-radius: 4px 18px 18px; font-size: 14px; }
.assistant-message.user .assistant-message-bubble { background: #eae9ff; border-color: #cecbfc; color: #232157; border-radius: 18px 4px 18px 18px; }
.assistant-message.demo .assistant-message-meta::after { color: #8b672f; }
.assistant-message.service .assistant-message-meta::after { color: var(--accent); }
.assistant-typing { height: 28px; width: min(240px,48vw); }
.assistant-typing i { background: var(--accent); width: 7px; height: 7px; }
.assistant-route-list { grid-template-columns: 1fr; gap: 10px; }
.assistant-route-card { min-height: 155px; padding: 17px; border-radius: 18px; background: var(--surface-soft); border-color: var(--line); box-shadow: none; color: var(--ink); }
.assistant-route-card:hover { border-color: #a5a0f1; box-shadow: none; }
.assistant-route-card.selected { background: #f0efff; border-color: var(--accent); box-shadow: none; }
.assistant-route-card strong { font-size: 16px; }
.assistant-route-card p { font-size: 13px; color: var(--muted); }
.assistant-route-top, .assistant-route-top span:last-child { color: var(--muted); font-size: 11px; }
.assistant-route-facts span { background: var(--surface-raised); color: var(--ink); font-size: 12px; padding: 5px 8px; }
.assistant-route-select { color: var(--accent); font-size: 13px; }
.assistant-route-followup { color: var(--muted); font-size: 12px; }
.assistant-route-followup button { min-height: 44px; background: var(--accent); color: var(--accent-ink); border-radius: var(--radius-control); }

@media (min-width:1200px) {
  .app-shell { width: min(1200px,calc(100% - 64px)); height: calc(100vh - 64px); height: calc(100dvh - 64px); margin: 32px auto; grid-template-columns: 76px 290px minmax(0,1fr); }
  .app-shell.mode-agent, .app-shell.mode-route { grid-template-columns: 76px minmax(0,1fr); }
  .assistant-screen:not(.is-chatting) { display: grid; grid-template-columns: minmax(0,1.1fr) minmax(0,1fr); grid-template-rows: 78px minmax(225px,1fr) auto auto minmax(56px,.3fr); gap: 0 36px; padding: 0 40px 20px; }
  .assistant-header { grid-column: 1/-1; grid-row: 1; height: 78px; }
  .assistant-brand strong { font-size: 16px; }
  .assistant-welcome { grid-column: 1; grid-row: 2; align-self: end; padding: 28px 0; }
  .assistant-welcome h1 { font-size: clamp(46px,4.2vw,61px); line-height: 1.15; }
  .desktop-title-break { display: block; }
  .assistant-subtitle { max-width: 25em; font-size: 14px; }
  .expedition-visual { grid-column: 2; grid-row: 2/6; align-self: stretch; height: auto; min-height: 380px; margin: 26px 0 0; }
  .expedition-visual figcaption { left: 28px; bottom: 30px; }
  .expedition-visual figcaption strong { font-size: 47px; }
  .assistant-composer { grid-column: 1; grid-row: 3; }
  .assistant-suggestions { grid-column: 1; grid-row: 4; }
  .assistant-tail { grid-column: 1; grid-row: 5; align-items: flex-start; padding-top: 18px; }
  .assistant-screen.is-chatting { padding-inline: 48px; }
  .assistant-screen.is-chatting .assistant-thread { max-width: 900px; padding: 32px 12px 15px; }
  .assistant-screen.is-chatting .assistant-composer { max-width: 876px; }
  .assistant-route-list { grid-template-columns: repeat(3,minmax(0,1fr)); }
}

@media (max-width:680px) {
  :root { --mobile-nav-height: calc(76px + env(safe-area-inset-bottom,0px)); }
  .app-shell { display: block; border: 0; border-radius: 0; width: 100%; height: 100vh; height: var(--mobile-viewport-height,100dvh); margin: 0; max-height: none; }
  .rail { display: none; }
  .app-shell.mode-agent .main, .app-shell.mode-route .main, .app-shell.mode-messages.chat-open .main { inset: 0 0 var(--mobile-nav-height); height: auto; }
  .assistant-screen:not(.is-chatting) { padding: env(safe-area-inset-top,0px) 20px 16px; }
  .assistant-header { height: 64px; min-height: 64px; }
  .assistant-brand { gap: 8px; }
  .assistant-brand strong { font-size: 14px; }
  .assistant-brand-mark { width: 30px; height: 30px; font-size: 19px; }
  .assistant-status { font-size: 11px; gap: 5px; }
  .assistant-status>span { font-size: 19px; }
  .assistant-welcome { padding: 22px 0 18px; min-height: 0!important; }
  .assistant-kicker { margin: 0 0 8px; font-size: 11px; }
  .assistant-welcome h1 { font-size: clamp(32px,9vw,44px); line-height: 1.2; }
  .assistant-subtitle { font-size: 12px; line-height: 1.8; margin: 9px 0 0; }
  .expedition-visual { height: clamp(150px,23vh,220px); height: clamp(150px,23dvh,220px); margin: 0 0 16px; border-radius: 22px; }
  .expedition-visual figcaption { bottom: 18px; left: 20px; font-size: 12px; }
  .expedition-visual figcaption strong { font-size: 29px; }
  .expedition-compass { bottom: 18px; right: 18px; width: 38px; height: 38px; font-size: 25px; }
  .assistant-composer { width: 100%; padding: 16px 17px 13px; border-radius: 22px; }
  .composer-caption { margin-bottom: 7px; font-size: 11px; }
  .assistant-composer textarea { min-height: 65px; padding-bottom: 10px; font-size: 16px; }
  .assistant-composer-bottom { padding-top: 9px; }
  .assistant-location-option { font-size: 11px; min-height: 44px; }
  .assistant-location-option small { display: none; }
  .assistant-send { min-height: 44px; padding: 0 12px; gap: 5px; font-size: 13px; }
  .assistant-suggestions { width: 100%; gap: 7px; margin-top: 10px; }
  .assistant-suggestions button { border-radius: 14px; min-height: 70px; padding: 10px 9px; font-size: 12px; }
  .suggestion-symbol { font-size: 17px; }
  .suggestion-detail { font-size: 10px; }
  .assistant-tail { padding: 14px 0 0; }
  .assistant-tail p { font-size: 10px; line-height: 1.8; }
  .assistant-screen.is-chatting { padding: env(safe-area-inset-top,0px) 16px 0; }
  .assistant-screen.is-chatting .assistant-composer { margin-bottom: 12px; padding: 13px 15px 10px; }
  .assistant-thread { padding: 20px 0 10px; }
  .assistant-message-body { max-width: calc(100% - 44px); }
  .assistant-message-bubble { padding: 12px 14px; }
  .mobile-tabs { isolation: isolate; position: fixed; display: flex; inset: auto 0 0; z-index: 7; width: min(100%,720px); margin: 0 auto; height: var(--mobile-nav-height); padding: 6px 16px env(safe-area-inset-bottom,0px); border-top: 1px solid var(--line); border-radius: 24px 24px 0 0; background: #ffffffed; backdrop-filter: blur(16px); }
  .mobile-tab { color: var(--muted); font-size: 11px; min-height: 60px; gap: 4px; }
  .mobile-tab span { width: 42px; height: 30px; border-radius: 14px; font-size: 22px; }
  .mobile-tab .ui-icon { width: 23px; height: 23px; }
  .mobile-tab.active { color: var(--accent); }
  .mobile-tab.active span { color: var(--accent-ink); background: var(--accent); }
  body.mobile-editing .mobile-tabs { display: none; }
}
@media (max-width:360px) {
  .assistant-screen:not(.is-chatting) { padding-inline: 16px; }
  .assistant-brand strong { font-size: 13px; }
  .assistant-status { font-size: 10px; }
  .assistant-composer { padding-inline: 14px; }
  .assistant-suggestions button { padding: 10px 8px; }
  .suggestion-symbol { display: none; }
}
@media (max-height:700px) and (min-width:1200px) {
  .assistant-screen:not(.is-chatting) { grid-template-rows: 64px minmax(170px,1fr) auto auto 44px; padding-bottom: 12px; }
  .assistant-header { height: 64px; }
  .assistant-welcome { padding-block: 18px; }
  .assistant-welcome h1 { font-size: 43px; }
  .assistant-composer textarea { min-height: 62px; }
}
@media (max-width:680px) and (max-height:670px) {
  .assistant-header { height: 56px; min-height: 56px; }
  .assistant-welcome { padding: 14px 0 12px; }
  .assistant-kicker { margin-bottom: 6px; }
  .assistant-welcome h1 { font-size: 30px; }
  .assistant-subtitle { margin-top: 7px; line-height: 1.6; }
  .expedition-visual { height: 108px; margin-bottom: 12px; }
  .expedition-visual figcaption { bottom: 13px; }
  .expedition-visual figcaption strong { font-size: 24px; }
  .expedition-compass { bottom: 13px; width: 32px; height: 32px; font-size: 22px; }
  .assistant-composer textarea { min-height: 58px; }
}
@media (prefers-reduced-motion:no-preference) {
  .assistant-welcome, .expedition-visual { animation: dashan-enter .45s cubic-bezier(.16,1,.3,1) both; }
  .expedition-visual { animation-delay: .06s; }
  .assistant-message { animation-duration: .25s; }
  @keyframes dashan-enter { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
}
@media (prefers-reduced-motion:reduce) {
  *, *::before, *::after { animation: none!important; transition: none!important; scroll-behavior: auto!important; }
}
@media (prefers-reduced-transparency:reduce) { .mobile-tabs { background: #ffffff; backdrop-filter: none; } }