:root {
  --bg: #f6f7fb;
  --card: #ffffff;
  --text: #1f2533;
  --muted: #6b7280;
  --line: #e5e7ef;
  --brand: #4c6ef5;
  --pos: #2f9e44;
  --neg: #e8590c;
  --shadow: 0 1px 2px rgba(16, 24, 40, .04), 0 8px 24px rgba(16, 24, 40, .06);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

main { max-width: 760px; margin: 0 auto; padding: 40px 20px 64px; }

header h1 { margin: 0 0 8px; font-size: 26px; letter-spacing: -.3px; }
.sub { margin: 0 0 6px; color: var(--muted); }
.small { font-size: 13px; }
code {
  background: #eef1f8; padding: 1px 6px; border-radius: 5px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .92em;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 20px;
  margin-top: 20px;
  box-shadow: var(--shadow);
}

label { display: block; font-weight: 600; margin-bottom: 8px; }

textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  font: inherit;
  color: inherit;
  resize: vertical;
  outline: none;
  transition: border-color .15s, box-shadow .15s;
}
textarea:focus { border-color: var(--brand); box-shadow: 0 0 0 3px rgba(76, 110, 245, .12); }

.row { display: flex; align-items: center; gap: 10px; margin-top: 14px; flex-wrap: wrap; }

button {
  border: none;
  border-radius: 9px;
  padding: 10px 18px;
  font: inherit;
  font-weight: 600;
  background: var(--brand);
  color: #fff;
  cursor: pointer;
  transition: filter .15s, opacity .15s;
}
button:hover:not(:disabled) { filter: brightness(1.06); }
button:disabled { opacity: .5; cursor: not-allowed; }
button.ghost { background: #eef1f8; color: var(--muted); }

.status { color: var(--muted); font-size: 13px; }

.examples { margin-top: 16px; display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.examples > span { color: var(--muted); font-size: 13px; }
.chip {
  background: #f1f3f9;
  color: #3b4252;
  font-weight: 500;
  font-size: 13px;
  padding: 6px 12px;
  border-radius: 999px;
}
.chip:hover { background: #e6e9f5; }

.verdict { display: flex; align-items: baseline; gap: 12px; margin-bottom: 18px; }
#verdict-label { font-size: 26px; font-weight: 700; }
#verdict-label.pos { color: var(--pos); }
#verdict-label.neg { color: var(--neg); }
.conf { color: var(--muted); font-size: 14px; }

.bars { display: grid; gap: 14px; }
.bar-head { display: flex; justify-content: space-between; font-size: 13px; color: var(--muted); margin-bottom: 6px; }
.track { height: 10px; background: #eef1f8; border-radius: 999px; overflow: hidden; }
.fill { height: 100%; width: 0; border-radius: 999px; transition: width .45s cubic-bezier(.22,.61,.36,1); }
.fill.pos { background: linear-gradient(90deg, #51cf66, var(--pos)); }
.fill.neg { background: linear-gradient(90deg, #ffa94d, var(--neg)); }

.meta { color: var(--muted); font-size: 13px; margin: 16px 0 0; }

footer { margin-top: 28px; color: var(--muted); text-align: center; }
footer a { color: var(--brand); text-decoration: none; }
footer a:hover { text-decoration: underline; }

.spinner {
  display: inline-block; width: 12px; height: 12px;
  border: 2px solid #cfd6ea; border-top-color: var(--brand);
  border-radius: 50%; animation: spin .7s linear infinite;
  vertical-align: -2px; margin-right: 6px;
}
@keyframes spin { to { transform: rotate(360deg); } }