/* app.cssとindex.cssの統合スタイル */
:root {
  --accent: #1f6feb;
  --error: #d32f2f;
  --border: #dde2e8;
  color-scheme: light dark;
}
body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans JP",
    "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  line-height: 1.6;
  margin: 0;
  padding: 2rem;
  background: #fafbfc;
  color: #0f172a;
}
.container, .card {
  max-width: 720px;
  margin: 0 auto;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
}
.card {
  max-width: 420px;
  border-radius: 8px;
  border: 1px solid #ccc;
  box-shadow: none;
}
h1 {
  font-size: 1.5rem;
  margin: 0 0 1rem;
  letter-spacing: 0.02em;
}
form {
  display: grid;
  gap: 1rem;
}
label {
  font-weight: 600;
  display: block;
  margin-bottom: 0.5rem;
}
.field {
  display: grid;
  gap: 0.5rem;
}
input[type="text"], input[type="password"] {
  font-size: 1rem;
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  width: 20ch;
}
input[type="password"] {
  width: 100%;
  padding: 0.5rem;
}
.checkboxes {
  display: grid;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #f7f9fc;
}
.checkbox-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.actions {
  display: flex;
  gap: 0.75rem;
  align-items: center;
}
button, button[type="submit"] {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 0.6rem 1rem;
  font-size: 1rem;
  cursor: pointer;
  margin-top: 1rem;
  transition: background 0.2s;
}
button[type="submit"]:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}
.status {
  font-size: 0.95rem;
  color: #475569;
}
.error {
  color: var(--error);
  min-height: 1.5em;
  margin-top: 0.75rem;
}
.hint {
  font-size: 0.9rem;
  color: #64748b;
}
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}