:root {
  --bg: #f7f8fa;
  --fg: #1c2024;
  --muted: #6b7280;
  --border: #e5e7eb;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --danger: #dc2626;
  --success: #16a34a;
  --card-bg: #ffffff;
  --code-bg: #f3f4f6;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Pretendard", "Apple SD Gothic Neo", "Segoe UI", sans-serif;
  background: var(--bg); color: var(--fg);
  line-height: 1.5;
}
code, pre { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; background: var(--code-bg); padding: 0.1em 0.3em; border-radius: 4px; }
pre { padding: 12px; overflow-x: auto; white-space: pre-wrap; word-break: break-all; }

.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 28px; background: #fff; border-bottom: 1px solid var(--border);
}
.topbar .brand { font-weight: 700; font-size: 18px; text-decoration: none; color: var(--fg); }
.topbar nav { display: flex; align-items: center; gap: 18px; font-size: 14px; }
.topbar nav a { color: var(--fg); text-decoration: none; }
.topbar nav a:hover { color: var(--primary); }
.topbar .who { color: var(--muted); }
.topbar .logout { color: var(--danger); }

.container { max-width: 1080px; margin: 32px auto; padding: 0 24px; }
h1, h2, h3 { margin-top: 0; }
h2 { margin-bottom: 16px; }
h3 { margin: 28px 0 12px; }

.card { background: var(--card-bg); border: 1px solid var(--border); border-radius: 12px; padding: 20px; margin-bottom: 16px; }
.card-title { font-size: 13px; color: var(--muted); margin-bottom: 8px; text-transform: uppercase; letter-spacing: 0.05em; }
.card.success { border-color: var(--success); }
.card.danger { border-color: var(--danger); }
.centered { text-align: center; max-width: 520px; margin: 60px auto; }

.big-num { font-size: 28px; font-weight: 700; }

.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 24px; }
@media (max-width: 700px) { .grid { grid-template-columns: 1fr; } }

table.data { width: 100%; border-collapse: collapse; background: #fff; border-radius: 12px; overflow: hidden; border: 1px solid var(--border); }
table.data th, table.data td { padding: 10px 14px; text-align: left; border-bottom: 1px solid var(--border); font-size: 14px; vertical-align: middle; }
table.data th { background: #fafbfc; font-weight: 600; color: var(--muted); font-size: 12px; text-transform: uppercase; }
table.data tr:last-child td { border-bottom: none; }

form label { display: block; margin: 12px 0; font-size: 13px; color: var(--muted); }
form input[type=text], form select { display: block; width: 100%; max-width: 480px; padding: 8px 10px; border: 1px solid var(--border); border-radius: 6px; font-size: 14px; margin-top: 4px; }
form input[type=text]:focus, form select:focus { outline: 2px solid var(--primary); outline-offset: -1px; }

.btn { display: inline-block; padding: 8px 16px; border: 1px solid var(--border); border-radius: 6px; background: #fff; color: var(--fg); cursor: pointer; font-size: 14px; text-decoration: none; }
.btn:hover { background: #f3f4f6; }
.btn.primary { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn.primary:hover { background: var(--primary-dark); }
.btn.danger { background: #fff; color: var(--danger); border-color: var(--danger); }
.btn.danger:hover { background: var(--danger); color: #fff; }
.btn.big { padding: 12px 24px; font-size: 16px; }
.btn.small { padding: 4px 10px; font-size: 12px; }

.muted { color: var(--muted); }
.small { font-size: 12px; }
.mt { margin-top: 16px; }

.key-display {
  background: #fefce8; border: 1px solid #facc15; padding: 14px; border-radius: 8px;
  font-size: 15px; font-weight: 600; user-select: all;
}

.footer { text-align: center; color: var(--muted); padding: 32px; font-size: 12px; }
.footer code { font-size: 12px; }