:root {
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --app-width: 760px;
  --touch: 44px;
  --ease: cubic-bezier(.22, 1, .36, 1);
  --ui-font: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --serif-font: "Songti SC", "STSong", "Noto Serif CJK SC", Georgia, serif;
  --mono-font: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --page: #d8cfbb;
  --ground: #f1ecde;
  --composer-bg: rgba(241,236,222,.92);
  --surface: #e9e1cf;
  --ink: #1a1a18;
  --muted: #736d5a;
  --placeholder: #8f8771;
  --line: #c8bea4;
  --line-strong: #736d5a;
  --accent: #1b4b5a;
  --accent-soft: rgba(27,75,90,.1);
  --user-bg: #e6dcc4;
  --button-ink: #f7f2e7;
  --control-radius: 999px;
  --bubble-radius: 16px 16px 5px 16px;
  --composer-radius: 18px;
  --send-radius: 12px;
  --composer-shadow: 0 16px 36px rgba(82,64,36,.1);
  --error-bg: #efd9cc;
  --error-line: #a04a2a;
  --error-ink: #70301b;
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: var(--page);
}

body {
  min-width: 320px;
  min-height: 100vh;
  min-height: 100dvh;
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font-family: var(--ui-font);
  font-size: 16px;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

button,
textarea,
input {
  font: inherit;
}

button,
summary,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  color: inherit;
}

a {
  color: inherit;
  text-underline-offset: 3px;
}

.app-shell {
  width: min(100%, var(--app-width));
  height: 100vh;
  height: 100dvh;
  margin: 0 auto;
  background: var(--ground);
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  overflow: hidden;
}

.app-header {
  position: relative;
  z-index: 4;
  padding-top: var(--safe-top);
  background: var(--ground);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  min-height: 72px;
  padding: 0 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand,
.brand:visited {
  color: inherit;
  text-decoration: none;
  transition: color 150ms var(--ease);
}

.brand:hover {
  color: var(--accent);
  text-decoration: underline;
}

.brand-name {
  font-family: var(--serif-font);
  font-size: 19px;
  font-style: italic;
  font-weight: 700;
  letter-spacing: -.02em;
  white-space: nowrap;
}

.runtime-status {
  display: inline-flex;
  min-height: 32px;
  align-items: center;
  gap: 7px;
  color: var(--muted);
  font-size: 12px;
  white-space: nowrap;
}

.runtime-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
}

.workspace {
  min-height: 0;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  overflow: hidden;
}

.intro {
  grid-row: 1;
  padding: 36px 20px 30px;
  border-bottom: 1px solid var(--line);
  overflow: hidden;
  text-align: center;
}

.intro-kicker {
  margin: 0 0 10px;
  color: var(--accent);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
}

.intro-title {
  max-width: 21rem;
  margin: 0 auto;
  font-family: var(--serif-font);
  font-size: clamp(30px, 8.6vw, 44px);
  font-style: italic;
  font-weight: 600;
  line-height: 1.03;
  letter-spacing: -.04em;
  text-wrap: balance;
}

.sample-row {
  margin-top: 18px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.sample-query {
  min-height: 36px;
  padding: 7px 11px;
  border: 1px solid var(--line-strong);
  border-radius: var(--control-radius);
  background: var(--surface);
  color: var(--ink);
  font-size: 13px;
  cursor: pointer;
  transition: transform 100ms var(--ease), border-color 150ms var(--ease), background-color 150ms var(--ease), color 150ms var(--ease);
}

.sample-query:hover {
  background: var(--user-bg);
}

.sample-query:active {
  border-color: var(--ink);
  background: var(--line-strong);
  color: var(--button-ink);
  transform: translateY(1px);
}

.sample-query:focus-visible {
  outline: 3px solid var(--line-strong);
  outline-offset: 3px;
}

.conversation {
  grid-row: 2;
  min-height: 0;
  padding: 22px 18px 26px;
  overflow-y: auto;
  overscroll-behavior-y: contain;
  scrollbar-width: thin;
  scrollbar-color: var(--line-strong) transparent;
}

.message-list {
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.message {
  min-width: 0;
  animation: message-in 360ms var(--ease) both;
}

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

.message-meta {
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 11px;
  letter-spacing: .04em;
}

.outcome {
  display: inline-flex;
  min-height: 23px;
  align-items: center;
  padding: 2px 8px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .03em;
}

.message-body {
  max-width: 100%;
  color: var(--ink);
  font-size: 15px;
  line-height: 1.72;
  text-wrap: pretty;
}

.message-body > :first-child {
  margin-top: 0;
}

.message-body > :last-child {
  margin-bottom: 0;
}

.message-body p {
  margin: 0 0 12px;
}

.message-body h3 {
  margin: 20px 0 8px;
  font-size: 16px;
  line-height: 1.4;
}

.message.assistant .message-body {
  line-height: 1.75;
}

.message.assistant .message-body h3 {
  font-size: 20px;
  font-weight: 700;
}

.message-body ul,
.message-body ol {
  margin: 8px 0 14px;
  padding-left: 1.35em;
}

.message-body li + li {
  margin-top: 7px;
}

.message.user .message-body {
  width: fit-content;
  max-width: min(88%, 34rem);
  margin-left: auto;
  padding: 12px 15px;
  border-radius: var(--bubble-radius);
  background: var(--user-bg);
  color: var(--ink);
}

.message.error .message-body {
  padding: 13px 15px;
  border: 1px solid var(--error-line);
  border-radius: 14px;
  background: var(--error-bg);
  color: var(--error-ink);
}

.sources {
  margin-top: 18px;
  border-top: 1px solid var(--line);
}

.sources summary {
  min-height: 46px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: .08em;
  text-transform: uppercase;
  cursor: pointer;
  list-style: none;
}

.sources summary::-webkit-details-marker {
  display: none;
}

.sources summary::after {
  content: "+";
  color: var(--accent);
  font-family: var(--mono-font);
  font-size: 18px;
  line-height: 1;
}

.sources[open] summary::after {
  content: "−";
}

.source-list {
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  display: grid;
  gap: 8px;
}

.source-item {
  min-width: 0;
  padding: 11px 12px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface);
  display: grid;
  gap: 5px;
}

.source-topline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.source-kind {
  color: var(--accent);
  font-size: 10px;
  font-weight: 750;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.source-id {
  color: var(--muted);
  font-family: var(--mono-font);
  font-size: 10px;
}

.source-detail {
  min-width: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
}

.source-name {
  min-width: 0;
  overflow: hidden;
  color: var(--ink);
  font-family: var(--mono-font);
  font-size: 11px;
  line-height: 1.55;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.source-link {
  position: relative;
  z-index: 1;
  justify-self: end;
  color: var(--accent);
  font-size: 10px;
  font-weight: 750;
  text-decoration-thickness: 1px;
  white-space: nowrap;
}

.typing {
  width: fit-content;
  min-height: 38px;
  padding: 12px 14px;
  display: flex;
  align-items: center;
  gap: 5px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface);
}

.typing span {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--muted);
  animation: typing 1s infinite ease-in-out;
}

.typing span:nth-child(2) { animation-delay: 120ms; }
.typing span:nth-child(3) { animation-delay: 240ms; }

@keyframes typing {
  0%, 70%, 100% { opacity: .3; transform: translateY(0); }
  35% { opacity: 1; transform: translateY(-3px); }
}

.composer-wrap {
  grid-row: 3;
  position: relative;
  z-index: 3;
  padding: 12px 14px calc(12px + var(--safe-bottom));
  border-top: 1px solid var(--line);
  background: var(--composer-bg);
  backdrop-filter: blur(14px);
}

.composer-wrap .sample-row {
  margin: 0 0 8px;
}

.composer {
  min-height: 54px;
  padding: 6px 6px 6px 14px;
  display: flex;
  align-items: flex-end;
  gap: 8px;
  border: 1px solid var(--line-strong);
  border-radius: var(--composer-radius);
  background: var(--surface);
  box-shadow: var(--composer-shadow);
  transition: border-color 150ms var(--ease), box-shadow 150ms var(--ease);
}

.composer:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft), var(--composer-shadow);
}

.query-input {
  width: 100%;
  min-height: 44px;
  max-height: 132px;
  padding: 10px 0;
  resize: none;
  overflow-y: hidden;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--ink);
  line-height: 24px;
}

.query-input::placeholder {
  color: var(--placeholder);
}

.send-button {
  flex: 0 0 auto;
  min-width: var(--touch);
  min-height: var(--touch);
  padding: 0 14px;
  border: 0;
  border-radius: var(--send-radius);
  background: var(--accent);
  color: var(--button-ink);
  font-size: 14px;
  font-weight: 750;
  cursor: pointer;
  transition: transform 150ms var(--ease), filter 150ms var(--ease), opacity 150ms var(--ease);
}

.send-button:hover {
  filter: brightness(1.07);
}

.send-button:active {
  transform: translateY(1px) scale(.985);
}

.send-button:disabled {
  cursor: not-allowed;
  opacity: .42;
  filter: none;
}

body.has-query .sample-row {
  display: none;
}

body.intro-hidden .intro {
  display: none;
}

body.intro-hidden .conversation {
  padding-top: 14px;
  padding-bottom: 16px;
}

body.intro-hidden .message-list {
  gap: 14px;
}

@media (min-width: 820px) {
  body {
    padding: 26px 0;
  }

  .app-shell {
    height: calc(100vh - 52px);
    height: calc(100dvh - 52px);
    border: 1px solid var(--line);
    border-radius: 22px;
    box-shadow: 0 24px 60px rgba(70,54,30,.16);
  }

  .conversation {
    padding-left: 34px;
    padding-right: 34px;
  }

  .intro {
    padding-left: 34px;
    padding-right: 34px;
  }

  .composer-wrap {
    padding-left: 28px;
    padding-right: 28px;
  }
}

@media (max-width: 540px) {
  .header-inner {
    min-height: 58px;
    padding-left: 15px;
    padding-right: 15px;
  }

  .runtime-status span:last-child {
    max-width: 64px;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .intro {
    padding-left: 17px;
    padding-right: 17px;
  }

  .conversation {
    padding-left: 15px;
    padding-right: 15px;
  }

}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}