:root {
  color-scheme: light;
  --bg: #f6f8fb;
  --card: #ffffff;
  --text: #1f2328;
  --muted: #667085;
  --line: #e6eaf0;
  --accent: #3b82f6;
  --accent-soft: #eff6ff;
  --shadow: 0 10px 30px rgba(15, 23, 42, .05);
}
* { box-sizing: border-box; }
html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", sans-serif;
}
body { min-height: 100vh; }
.app {
  width: min(920px, 100%);
  margin: 0 auto;
  padding: 12px;
}
.topbar, .answer-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: var(--shadow);
}
.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  padding: 14px;
  margin-bottom: 12px;
  backdrop-filter: blur(10px);
}
.brand {
  font-size: 13px;
  color: var(--muted);
  font-weight: 600;
  margin-bottom: 10px;
}
.searchbar {
  display: flex;
  align-items: center;
  gap: 10px;
}
.searchbar input {
  flex: 1;
  min-width: 0;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0 16px;
  font-size: 16px;
  background: #fff;
  outline: none;
}
.searchbar input:focus {
  border-color: #bfd5ff;
  box-shadow: 0 0 0 4px rgba(59,130,246,.08);
}
.searchbar button {
  border: 0;
  border-radius: 999px;
  font-size: 14px;
}
.searchbar button {
  flex: 0 0 auto;
  height: 42px;
  padding: 0 18px;
  background: var(--accent);
  color: #fff;
  white-space: nowrap;
}
.answer-card {
  padding: 16px;
  display: flex;
  flex-direction: column;
  min-height: calc(100vh - 128px);
  max-height: calc(100vh - 128px);
}
.answer-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 10px;
}
.answer-head-main {
  margin-bottom: 8px;
}
.answer-label {
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 8px;
}
.answer-title {
  margin: 0;
  font-size: 24px;
  line-height: 1.35;
  word-break: break-word;
}
.status {
  white-space: nowrap;
  color: var(--muted);
  font-size: 13px;
  padding-top: 2px;
}
.answer-scroll {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding-right: 2px;
  scrollbar-width: thin;
  scrollbar-color: rgba(31, 35, 40, .08) transparent;
}
.answer-scroll::-webkit-scrollbar {
  width: 3px;
}
.answer-scroll::-webkit-scrollbar-track {
  background: transparent;
}
.answer-scroll::-webkit-scrollbar-thumb {
  background: rgba(31, 35, 40, .08);
  border-radius: 999px;
}
.answer-scroll::-webkit-scrollbar-thumb:hover {
  background: rgba(31, 35, 40, .16);
}
.markdown-body {
  font-size: 15px;
  line-height: 1.8;
  word-break: break-word;
}
.markdown-body > :first-child { margin-top: 0; }
.markdown-body > :last-child { margin-bottom: 0; }
.markdown-body h1,
.markdown-body h2,
.markdown-body h3 {
  line-height: 1.4;
  margin: 1.2em 0 .6em;
}
.markdown-body h1 { font-size: 24px; }
.markdown-body h2 { font-size: 20px; }
.markdown-body h3 { font-size: 17px; }
.markdown-body p,
.markdown-body ul,
.markdown-body ol,
.markdown-body pre,
.markdown-body blockquote,
.markdown-body table {
  margin: .9em 0;
}
.markdown-body ul,
.markdown-body ol {
  padding-left: 1.4em;
}
.markdown-body code {
  background: #f1f4f8;
  border-radius: 6px;
  padding: .15em .4em;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: .92em;
}
.markdown-body pre {
  background: #0f172a;
  color: #e5e7eb;
  border-radius: 12px;
  padding: 14px;
  overflow: auto;
}
.markdown-body pre code {
  background: transparent;
  color: inherit;
  padding: 0;
}
.markdown-body blockquote {
  margin-left: 0;
  padding: .2em 1em;
  border-left: 4px solid #cfe0ff;
  color: #4b5563;
  background: #f8fbff;
  border-radius: 0 10px 10px 0;
}
.markdown-body table {
  width: 100%;
  border-collapse: collapse;
  display: block;
  overflow-x: auto;
}
.markdown-body th,
.markdown-body td {
  border: 1px solid #e5e7eb;
  padding: 8px 10px;
  text-align: left;
}
.markdown-body th { background: #f8fafc; }
.markdown-body a { color: #2458d3; }
.markdown-body hr {
  border: 0;
  border-top: 1px solid #e5e7eb;
  margin: 1.2em 0;
}
@media (max-width: 640px) {
  .app { padding: 10px; }
  .topbar, .answer-card { border-radius: 16px; }
  .topbar { padding: 12px; }
  .searchbar { gap: 8px; }
  .searchbar input { height: 40px; font-size: 15px; }
  .searchbar button { height: 40px; padding: 0 14px; }
  .answer-card {
    min-height: calc(100vh - 118px);
    max-height: calc(100vh - 118px);
  }
  .answer-title { font-size: 20px; }
}