:root {
  --bg: #f4f6f9;
  --card: #ffffff;
  --ink: #1c2430;
  --muted: #67727f;
  --accent: #2563eb;
  --accent-dark: #1d4ed8;
  --line: #e3e8ef;
  --ok: #e8f3ec;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
  display: flex;
  justify-content: center;
  padding: 32px 16px;
  line-height: 1.5;
}
.card {
  background: var(--card);
  width: 100%;
  max-width: 640px;
  border-radius: 16px;
  padding: 32px;
  box-shadow: 0 8px 30px rgba(20, 30, 50, .08);
}
h1 { margin: 0 0 4px; font-size: 1.6rem; }
.sub { margin: 0 0 24px; color: var(--muted); }
.field { display: block; margin-bottom: 20px; }
.field span { display: block; font-weight: 600; font-size: .9rem; margin-bottom: 6px; }
.field input {
  width: 100%; padding: 11px 13px; border: 1px solid var(--line);
  border-radius: 10px; font-size: 1rem;
}
.field input:focus { outline: none; border-color: var(--accent); }
.drop {
  border: 2px dashed var(--line); border-radius: 12px; padding: 28px 20px;
  text-align: center; transition: border-color .15s, background .15s; margin-bottom: 20px;
}
.drop.over { border-color: var(--accent); background: #f0f5ff; }
.drop p { margin: 4px 0; }
.hint { color: var(--muted); font-size: .85rem; }
.filename { font-weight: 600; color: var(--accent-dark); }
.link {
  background: none; border: none; color: var(--accent); cursor: pointer;
  font: inherit; text-decoration: underline; padding: 0;
}
.primary {
  width: 100%; padding: 13px; border: none; border-radius: 10px;
  background: var(--accent); color: #fff; font-size: 1rem; font-weight: 600;
  cursor: pointer; transition: background .15s;
}
.primary:hover:not(:disabled) { background: var(--accent-dark); }
.primary:disabled { opacity: .45; cursor: not-allowed; }
.status {
  margin-top: 18px; padding: 12px 14px; border-radius: 10px; font-size: .92rem;
  background: #fff7ed; border: 1px solid #fed7aa;
}
.status.err { background: #fef2f2; border-color: #fecaca; color: #b91c1c; }
.status.work { background: #eff6ff; border-color: #bfdbfe; color: #1e40af; }
section#result { margin-top: 28px; }
h2 { font-size: 1.15rem; margin: 0 0 4px; }
.period { color: var(--muted); font-weight: 400; }
.matched { color: var(--muted); font-size: .9rem; margin: 0 0 14px; }
.warn {
  background: #fef3c7; border: 1px solid #f59e0b; color: #7c4a03;
  border-radius: 10px; padding: 12px 14px; margin: 0 0 16px; font-size: .9rem;
}
.warn ul { margin: 8px 0; padding-left: 20px; }
.warn li { margin: 3px 0; }
tr.disputed { background: #fff7ed; }
table { width: 100%; border-collapse: collapse; margin-bottom: 20px; font-size: .92rem; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); }
th { color: var(--muted); font-weight: 600; }
.howto { color: var(--muted); font-size: .85rem; margin-top: 14px; }
.privacy { color: var(--muted); font-size: .8rem; margin-top: 26px; text-align: center; }