:root {
  --bg: #e9e9e9;
  --panel: #fff;
  --panel-strong: #f3f3f3;
  --text: #2f241f;
  --muted: #6a574d;
  --accent: #5b5b5b;
  --accent-dark: #1f1f1f;
  --border: #d8d8d8;
  --error: #a70000;
  --shadow: 0 20px 50px rgba(66, 42, 29, 0.12);
  --base-font-size: 14px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", "Noto Sans KR", sans-serif;
  color: var(--text);
  font-size: var(--base-font-size);
}

.w100 {
  width: 100%;
}

.page {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px;
}

.page.center {
  min-height: 90vh;
  max-width: 640px;
  display: flex;
  align-items: center;
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 8px 14px;
  margin-bottom: 24px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #fff;
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow);
}

.brand {
  color: var(--text);
  text-decoration: none;
  font-size: 1.25rem;
  font-weight: 700;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.nav a,
.button {
  color: var(--text);
  text-decoration: none;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px 16px;
  background: var(--bg);
}

.button.primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.button.primary:hover {
  background: var(--accent-dark);
}

.content {
  display: grid;
  gap: 22px;
}

.hero,
.grid {
  display: grid;
  gap: 22px;
}

.grid {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.card {
  padding: 28px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--panel);
  box-shadow: var(--shadow);
}

.wide {
  width: 100%;
}

.muted {
  color: var(--muted);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.form {
  display: grid;
  gap: 12px;
}

.form input {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #fff;
}

.form button {
  padding: 12px 14px;
  border: none;
  border-radius: 6px;
  background: var(--bg);
  color: #000;
  border: 1px solid var(--border);
  font-size: 1rem;
  cursor: pointer;
}

.error {
  padding: 12px 14px;
  margin-bottom: 14px;
  border-radius: 6px;
  background: rgba(165, 39, 39, 0.08);
  color: var(--error);
}

.list {
  padding-left: 18px;
}

.qr-image {
  max-width: 100%;
}

.word-break-all {
  word-break: break-all;
}

.credential-list {
  padding-left: 1rem;
}

pre {
  overflow-x: auto;
  padding: 16px;
  border-radius: 6px;
  background: #2d211d;
  color: #fef3e3;
}

@media (max-width: 720px) {
  .page {
    padding: 16px;
  }

  .header {
    flex-direction: column;
    align-items: flex-start;
  }
}