* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #f3f4f6;
}

/* 전체 컨테이너 */
.container {
  max-width: 600px;
  margin: 0 auto;
  padding: 16px;
}

/* 제목 */
h1 {
  font-size: 1.4rem;
  text-align: center;
  margin-bottom: 16px;
}

/* 카드 박스 */
.card {
  background: #ffffff;
  border-radius: 8px;
  padding: 12px 12px 16px;
  margin-bottom: 16px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.06);
}

.card h2 {
  font-size: 1.1rem;
  margin-top: 0;
}

/* 버튼 */
button {
  display: inline-block;
  padding: 8px 14px;
  border-radius: 6px;
  border: none;
  font-size: 0.95rem;
  cursor: pointer;
  background: #2563eb;
  color: #ffffff;
}

button:disabled {
  opacity: 0.6;
  cursor: default;
}

/* 라벨 */
label {
  display: block;
  font-size: 0.9rem;
  margin: 8px 0 6px;
}

/* ✅ 모든 input 공통 스타일 (text / password 포함) */
input {
  width: 100%;
  padding: 8px;
  border-radius: 6px;
  border: 1px solid #d1d5db;
  margin-top: 4px;
  font-size: 0.95rem;
}

/* 포커스 효과 */
input:focus {
  outline: none;
  border-color: #2563eb;
  box-shadow: 0 0 0 1px rgba(37, 99, 235, 0.4);
}

/* 코드/로그 출력용 */
.mono {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas,
    "Liberation Mono", "Courier New", monospace;
  font-size: 0.8rem;
  white-space: pre-wrap;
  background: #111827;
  color: #e5e7eb;
  border-radius: 6px;
  padding: 8px;
}

/* textarea 로그 */
textarea.mono {
  width: 100%;
  border: none;
  min-height: 200px;
  resize: vertical;
}

/* 힌트/메시지 */
.hint {
  font-size: 0.8rem;
  color: #6b7280;
  margin: 8px 0 6px;
}

/* QR 코드 */
.qr {
  display: block;
  margin: 12px auto 0;
  max-width: 220px;
  border-radius: 8px;
  background: #ffffff;
  padding: 8px;
}