:root { --navy: #1f2a44; --accent: #2d6cdf; --bg: #f4f6fb; --err: #b00020; }
* { box-sizing: border-box; }
body { margin: 0; font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif; background: var(--bg); color: #1a1a1a; }
.topbar { display: flex; flex-wrap: wrap; gap: .75rem; align-items: center; justify-content: space-between; background: var(--navy); color: #fff; padding: .75rem 1rem; }
.topbar a { color: #fff; text-decoration: none; margin-right: 1rem; }
.brand { font-weight: 700; }
.topbar nav { display: flex; align-items: center; gap: 1rem; }
.user { opacity: .8; font-size: .9rem; }
.linklike { background: none; border: none; color: #fff; cursor: pointer; font: inherit; text-decoration: underline; }
.inline { display: inline-flex; align-items: center; gap: .5rem; margin: 0; }
main { max-width: 760px; margin: 0 auto; padding: 1rem; }
.card { background: #fff; border-radius: 10px; padding: 1rem; margin-bottom: 1rem; box-shadow: 0 1px 4px rgba(0,0,0,.08); }
label { display: block; font-weight: 600; margin: .5rem 0 .25rem; }
input, select { width: 100%; padding: .6rem; border: 1px solid #ccc; border-radius: 8px; font: inherit; }
button.primary { background: var(--accent); color: #fff; border: none; border-radius: 8px; padding: .7rem 1.2rem; font: inherit; cursor: pointer; margin-top: .75rem; }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: .5rem; border-bottom: 1px solid #eee; }
.serial { font-family: ui-monospace, Consolas, monospace; font-size: 1.1rem; background: #eef3ff; padding: .6rem; border-radius: 8px; word-break: break-all; }
.error { color: var(--err); background: #fde7ea; padding: .6rem .8rem; border-radius: 8px; margin: .5rem 0; }
.muted { color: #666; font-size: .9rem; }
details { margin-top: 1rem; }
summary { cursor: pointer; font-weight: 600; }