:root { color-scheme: light; --ink: #2c3a4f; --soft: #5b6b88; --teal: #1a8f9c; --danger: #d93a4a; }
* { box-sizing: border-box; }
body { margin: 0; font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans", sans-serif; color: var(--ink); background: #f3faff; }
main { max-width: 760px; margin: 0 auto; padding: 24px 18px 48px; }
header h1 { margin: 0; color: var(--teal); }
.by { margin: 2px 0 10px; color: var(--soft); }
nav a, a { color: var(--teal); }
section { background: #fff; border-radius: 18px; padding: 18px 20px; margin: 18px 0; box-shadow: 0 2px 10px rgba(44, 58, 79, .06); }
h2 { margin-top: 0; }
h3 { margin-bottom: 6px; }
.box { border: 1px solid #cfe3f0; border-radius: 14px; padding: 14px; margin: 10px 0; }
button { font: inherit; font-weight: 700; padding: 10px 16px; border-radius: 12px; border: 1px solid #9ec7de; background: #e8f3ff; color: var(--ink); cursor: pointer; }
button.danger { background: var(--danger); color: #fff; border-color: var(--danger); }
button:disabled { opacity: .5; cursor: not-allowed; }
.row { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 12px; }
label { display: block; margin-top: 8px; }
#status.ok { color: #1f8a4c; font-weight: 700; }
#status.warn { color: #9a6700; font-weight: 700; }
#status.error { color: var(--danger); font-weight: 700; }
footer { color: var(--soft); text-align: center; font-size: 14px; }