:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --ink: #16181d;
  --ink-soft: #5b6270;
  --line: #dfe2e8;
  --accent: #2f6f5e;
  --accent-ink: #ffffff;
  --warn: #8a5a00;
  --warn-bg: #fff5df;
  --err: #a32d2d;
  --err-bg: #fdeeee;
  --radius: 10px;
  --gap: 14px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a;
    --surface: #1c1f25;
    --ink: #e8eaef;
    --ink-soft: #9aa2b1;
    --line: #2c3039;
    --accent: #4c9c86;
    --accent-ink: #0e1113;
    --warn: #e0b25c;
    --warn-bg: #2b2517;
    --err: #f2a5a5;
    --err-bg: #2c1b1b;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 15px/1.6 "Segoe UI", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

h1, h2 { margin: 0; font-weight: 600; }

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--gap);
  padding: 14px 20px;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  flex-wrap: wrap;
}

.brand { display: flex; align-items: center; gap: 12px; }
.brand h1 { font-size: 17px; }
.sub { margin: 0; font-size: 12px; color: var(--ink-soft); }

.mark {
  width: 34px; height: 34px;
  display: grid; place-items: center;
  border-radius: 8px;
  background: var(--accent);
  color: var(--accent-ink);
  font-size: 16px;
}

.status { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--ink-soft); }
.dot { width: 9px; height: 9px; border-radius: 50%; background: var(--ink-soft); }
.dot.ok { background: var(--accent); }
.dot.bad { background: var(--err); }

main {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 18px 20px 40px;
  flex: 1;
}

.banner {
  border-radius: var(--radius);
  padding: 10px 14px;
  margin-bottom: var(--gap);
  font-size: 13px;
  border: 1px solid var(--line);
}
.banner.warn { background: var(--warn-bg); color: var(--warn); border-color: transparent; }

.picker {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: var(--gap);
  align-items: end;
  margin-bottom: var(--gap);
  position: relative;
}
.pick label { display: block; font-size: 12px; color: var(--ink-soft); margin-bottom: 4px; }
select {
  width: 100%;
  padding: 9px 10px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  font: inherit;
}
.swap {
  width: 40px; height: 38px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
  font-size: 16px;
}
.swap:hover { border-color: var(--accent); color: var(--accent); }
.detect-hint {
  grid-column: 1 / -1;
  margin: 0;
  font-size: 12px;
  color: var(--warn);
}

.panes { display: grid; grid-template-columns: 1fr 1fr; gap: var(--gap); }
@media (max-width: 780px) {
  .panes, .picker { grid-template-columns: 1fr; }
  .swap { width: 100%; }
}

.pane {
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.pane-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 8px 12px;
  font-size: 12px;
  color: var(--ink-soft);
  border-bottom: 1px solid var(--line);
}
.count.over { color: var(--err); }
.meta { font-size: 12px; color: var(--ink-soft); }

textarea, .output {
  min-height: 240px;
  padding: 12px;
  border: 0;
  resize: vertical;
  font: inherit;
  background: var(--surface);
  color: var(--ink);
  white-space: pre-wrap;
  word-break: break-word;
  overflow: auto;
}
textarea:focus, .output:focus { outline: 2px solid var(--accent); outline-offset: -2px; }
.output:empty::before { content: "译文将显示在这里"; color: var(--ink-soft); }
.output.err { color: var(--err); }

.pane-foot {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-top: 1px solid var(--line);
  flex-wrap: wrap;
}
.chk { font-size: 12px; color: var(--ink-soft); display: flex; align-items: center; gap: 5px; }
.spacer { flex: 1; }

button {
  font: inherit;
  cursor: pointer;
  border-radius: var(--radius);
  padding: 8px 16px;
  border: 1px solid transparent;
}
.primary { background: var(--accent); color: var(--accent-ink); }
.primary:disabled { opacity: .55; cursor: default; }
.ghost { background: transparent; border-color: var(--line); color: var(--ink-soft); }
.ghost:hover:not(:disabled) { color: var(--ink); border-color: var(--accent); }
.ghost:disabled { opacity: .5; cursor: default; }

.error {
  margin: var(--gap) 0 0;
  padding: 10px 14px;
  border-radius: var(--radius);
  background: var(--err-bg);
  color: var(--err);
  font-size: 13px;
}

.history { margin-top: 26px; }
.hist-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 8px; }
.hist-head h2 { font-size: 14px; }
.hist-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.hist-list .empty { color: var(--ink-soft); font-size: 13px; }
.hist-item {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 9px 12px;
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 4px 12px;
  cursor: pointer;
  font-size: 13px;
}
.hist-item:hover { border-color: var(--accent); }
.hist-item .pair { color: var(--ink-soft); font-size: 11px; grid-row: span 2; }
.hist-item .txt { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.foot {
  padding: 14px 20px 24px;
  text-align: center;
  color: var(--ink-soft);
  font-size: 12px;
  border-top: 1px solid var(--line);
}
.foot p { margin: 0 auto; max-width: 760px; text-align: left; }
.foot p + p { margin-top: 6px; }
.caveat { font-size: 12px; color: var(--warn); border-left: 3px solid var(--warn);
            padding-left: 10px; text-align: left; }

.busy { animation: pulse 1.2s ease-in-out infinite; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: .45; } }

.siteback { display: flex; gap: 14px; margin-left: auto; }
.siteback a { color: var(--ink-soft); font-size: 13px; text-decoration: none; }
.siteback a:hover { color: var(--accent); text-decoration: underline; }
@media (max-width: 780px) { .siteback { margin-left: 0; } }