:root {
  --blue: #005a9e;
  --line: #c9d3dc;
  --bg: #f4f7fa;
  --err: #b00020;
  --ok: #1b6e2f;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, "Hiragino Sans", "Yu Gothic UI", "Meiryo", sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: #1c2630;
  background: var(--bg);
}

main {
  max-width: 640px;
  margin: 0 auto;
  padding: 20px 16px 8px;
}

h1 { font-size: 1.4rem; margin: 0 0 8px; color: var(--blue); }
h2 { font-size: 1.05rem; margin: 0 0 8px; }

.lead { margin: 0 0 20px; }

.step {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px 16px;
  margin-bottom: 14px;
}

.file-button {
  display: inline-block;
  padding: 10px 16px;
  border: 1px solid var(--blue);
  border-radius: 6px;
  color: var(--blue);
  background: #fff;
  cursor: pointer;
  font-weight: 600;
}

.file-button:hover { background: #eaf3fb; }
.file-button input { display: none; }

input[type="password"],
input[type="text"] {
  width: 100%;
  padding: 10px 12px;
  font-size: 1rem;
  border: 1px solid var(--line);
  border-radius: 6px;
}

.check { display: inline-block; margin-top: 8px; }

button {
  font-size: 1rem;
  padding: 10px 20px;
  border: 1px solid var(--blue);
  border-radius: 6px;
  background: #fff;
  color: var(--blue);
  cursor: pointer;
}

button.primary { background: var(--blue); color: #fff; font-weight: 600; }
button:disabled { opacity: 0.45; cursor: not-allowed; }

#btn-open { width: 100%; padding: 14px; font-size: 1.1rem; }

.info { margin: 8px 0 0; color: #43515e; word-break: break-all; }
.progress { min-height: 1.7em; margin: 10px 0 0; color: var(--blue); }

/* エラーの文は選択してコピーできる */
.error {
  margin: 6px 0 0;
  color: var(--err);
  font-weight: 600;
  user-select: text;
  -webkit-user-select: text;
  white-space: pre-wrap;
}

.result {
  background: #fff;
  border: 2px solid var(--ok);
  border-radius: 8px;
  padding: 14px 16px;
}

.result h2 { color: var(--ok); }

.meta { display: grid; grid-template-columns: 8em 1fr; gap: 4px 8px; margin: 0 0 14px; }
.meta dt { color: #43515e; }
.meta dd { margin: 0; word-break: break-all; }

.buttons { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 10px; }

footer {
  max-width: 640px;
  margin: 0 auto;
  padding: 8px 16px 24px;
  font-size: 0.8rem;
  color: #6a7885;
  text-align: center;
}

[hidden] { display: none !important; }

@media (max-width: 480px) {
  .meta { grid-template-columns: 1fr; }
  .meta dt { font-weight: 600; }
}