:root {
  --bg: #f4f6f8;
  --panel: #ffffff;
  --ink: #1c2733;
  --sub: #5b6b7a;
  --line: #dce3ea;
  --accent: #2563eb;
  --accent-d: #1d4ed8;
  --ok: #0f9d58;
  --err: #d23f31;
  --radius: 12px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Hiragino Sans", "Yu Gothic", "Meiryo", system-ui, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.7;
}

.site-header {
  text-align: center;
  padding: 32px 16px 8px;
}
.site-header h1 { margin: 0; font-size: 1.6rem; }
.tagline { color: var(--sub); margin: 6px 0 0; font-size: 0.95rem; }

main {
  max-width: 680px;
  margin: 0 auto;
  padding: 16px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  margin: 16px 0;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.field { margin-bottom: 18px; }
.field label {
  display: block;
  font-weight: 600;
  margin-bottom: 6px;
  font-size: 0.95rem;
}

select,
input[type="file"] {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  font-size: 1rem;
  font-family: inherit;
}

.hint { color: var(--sub); font-size: 0.85rem; margin: 6px 0 0; }
.hint.small { font-size: 0.8rem; }

.btn {
  display: inline-block;
  border: none;
  border-radius: 8px;
  padding: 12px 20px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  text-align: center;
  text-decoration: none;
  font-family: inherit;
}
.btn.primary { background: var(--accent); color: #fff; }
.btn.primary:hover { background: var(--accent-d); }
.btn.block { display: block; width: 100%; }
.btn:disabled { opacity: 0.55; cursor: default; }

.status {
  margin-top: 14px;
  padding: 12px 14px;
  border-radius: 8px;
  font-size: 0.92rem;
}
.status.info { background: #eef2ff; color: #2b3a67; }
.status.ok { background: #e7f6ec; color: var(--ok); }
.status.error { background: #fdecea; color: var(--err); }

.result h2 { font-size: 1.05rem; margin: 18px 0 8px; }
.report {
  white-space: pre-wrap;
  word-break: break-word;
  background: #f7f9fb;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
  font-size: 0.85rem;
  font-family: "SFMono-Regular", "Menlo", monospace;
  max-height: 360px;
  overflow: auto;
}

.site-footer {
  text-align: center;
  color: var(--sub);
  font-size: 0.8rem;
  padding: 24px 16px 40px;
}

.hidden { display: none; }