:root {
  --bg: #f4f6f9; --panel: #ffffff; --text: #1c2430; --muted: #5d6b7e; --line: #dde3eb;
  --accent: #1f6feb; --accent-text: #ffffff; --ok: #1a7f37; --ok-bg: #e6f4ea; --bad: #c62828; --bad-bg: #fdecea;
  --warn: #9a6700; --warn-bg: #fff8e1; --code-bg: #0f1720; --code-text: #d6e2f0;
  --ch-dev: #6e7781; --ch-beta: #9a6700; --ch-production: #1a7f37; --ch-retired: #8c959f;
  --radius: 8px; --shadow: 0 1px 2px rgba(16, 24, 40, .06);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f141a; --panel: #171d25; --text: #e3e9f0; --muted: #94a3b5; --line: #2a333f;
    --accent: #4c8dff; --ok: #4ac26b; --ok-bg: #12261a; --bad: #ff6b6b; --bad-bg: #2d1416;
    --warn: #e3b341; --warn-bg: #2b2310; --code-bg: #0a0e13; --shadow: none;
  }
}
* { box-sizing: border-box; }
html { font-size: 15px; }
body { margin: 0; background: var(--bg); color: var(--text); font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; line-height: 1.45; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
h1 { font-size: 1.5rem; margin: 0 0 .25rem; }
h2 { font-size: 1.15rem; margin: 0 0 .75rem; }
h3 { font-size: 1rem; margin: 0 0 .5rem; }
p { margin: .25rem 0 .75rem; }
.mono, code, pre { font-family: ui-monospace, "Cascadia Mono", Consolas, monospace; font-size: .9em; }
.muted { color: var(--muted); }
.small { font-size: .85rem; }
.hidden, [hidden] { display: none !important; }

/* layout */
.topbar { background: var(--panel); border-bottom: 1px solid var(--line); }
.topbar-inner { max-width: 1200px; margin: 0 auto; padding: .6rem 1rem; display: flex; align-items: center; gap: 1.25rem; flex-wrap: wrap; }
.brand { font-weight: 700; color: var(--text); }
.nav { display: flex; gap: .9rem; flex-wrap: wrap; flex: 1; }
.nav a { color: var(--muted); padding: .2rem 0; }
.nav a.active, .nav a:hover { color: var(--text); text-decoration: none; }
.userbox { display: flex; gap: .6rem; align-items: center; }
main { max-width: 1200px; margin: 0 auto; padding: 1.25rem 1rem 3rem; }
.page-head { display: flex; justify-content: space-between; align-items: flex-end; gap: 1rem; flex-wrap: wrap; margin-bottom: 1rem; }
.panel { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 1rem 1.1rem; margin-bottom: 1rem; box-shadow: var(--shadow); }
.grid { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); }
.cols { display: grid; gap: 1rem; grid-template-columns: 2fr 1fr; }
@media (max-width: 860px) { .cols { grid-template-columns: 1fr; } }
.stats { display: flex; gap: 1rem; flex-wrap: wrap; margin-bottom: 1rem; }
.stat { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: .7rem 1rem; min-width: 160px; }
.stat b { display: block; font-size: 1.4rem; }
dl.kv { display: grid; grid-template-columns: max-content 1fr; gap: .3rem 1rem; margin: 0; }
dl.kv dt { color: var(--muted); }
dl.kv dd { margin: 0; word-break: break-all; }

/* tables */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: .5rem .6rem; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-size: .8rem; text-transform: uppercase; letter-spacing: .03em; color: var(--muted); font-weight: 600; }
tr:last-child td { border-bottom: none; }
td.ok { color: var(--ok); font-weight: 600; }
td.bad { color: var(--bad); font-weight: 600; }

/* badges */
.badge { display: inline-block; padding: .05rem .5rem; border-radius: 999px; font-size: .78rem; font-weight: 600; border: 1px solid currentColor; }
.ch-dev { color: var(--ch-dev); }
.ch-beta { color: var(--ch-beta); }
.ch-production { color: var(--ch-production); }
.ch-retired { color: var(--ch-retired); text-decoration: line-through; }
.badge.ok { color: var(--ok); }
.badge.fail { color: var(--bad); }

/* forms */
form.inline { display: inline; }
label { display: block; font-weight: 600; margin: .6rem 0 .25rem; }
label.check { display: flex; gap: .5rem; align-items: center; font-weight: 400; }
input[type=text], input[type=email], input[type=password], input[type=number], input[type=file], select, textarea {
  width: 100%; padding: .5rem .6rem; border: 1px solid var(--line); border-radius: 6px; background: var(--bg); color: var(--text); font: inherit;
}
textarea { min-height: 6rem; resize: vertical; }
.row { display: flex; gap: .75rem; flex-wrap: wrap; align-items: flex-end; }
.row > * { flex: 1 1 180px; }
.row > .shrink { flex: 0 0 auto; }
.help { color: var(--muted); font-size: .85rem; margin-top: .2rem; }
.btn, button { display: inline-flex; align-items: center; gap: .4rem; padding: .5rem .95rem; border-radius: 6px; border: 1px solid var(--line);
  background: var(--panel); color: var(--text); font: inherit; font-weight: 600; cursor: pointer; }
.btn:hover, button:hover { text-decoration: none; filter: brightness(.97); }
.btn.primary, button.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); }
.btn.danger, button.danger { color: var(--bad); border-color: var(--bad); }
.btn.big, button.big { padding: .8rem 1.6rem; font-size: 1.1rem; }
button:disabled { opacity: .5; cursor: not-allowed; }
.actions { display: flex; gap: .5rem; flex-wrap: wrap; align-items: center; }

/* messages */
.msg { padding: .65rem .9rem; border-radius: 6px; margin-bottom: .75rem; border: 1px solid transparent; }
.msg.ok { background: var(--ok-bg); color: var(--ok); border-color: var(--ok); }
.msg.err { background: var(--bad-bg); color: var(--bad); border-color: var(--bad); }
.msg.warn { background: var(--warn-bg); color: var(--warn); border-color: var(--warn); }
.secret { display: flex; gap: .5rem; align-items: center; margin-top: .4rem; }
.secret code { background: var(--bg); border: 1px solid var(--line); padding: .35rem .5rem; border-radius: 6px; flex: 1; word-break: break-all; }

/* login */
.login-wrap { max-width: 380px; margin: 8vh auto; }
.login-wrap .panel { padding: 1.5rem; }
.divider { text-align: center; color: var(--muted); margin: 1rem 0; font-size: .85rem; }

/* flasher */
.status-banner { padding: .8rem 1rem; border-radius: 6px; background: var(--bg); border: 1px solid var(--line); font-weight: 600; }
.status-banner.ok { background: var(--ok-bg); color: var(--ok); border-color: var(--ok); }
.status-banner.bad { background: var(--bad-bg); color: var(--bad); border-color: var(--bad); }
.progress-row { display: flex; align-items: center; gap: .75rem; margin: 1rem 0; }
progress { flex: 1; height: 1.1rem; accent-color: var(--accent); }
.device-card { border: 2px solid var(--ok); border-radius: var(--radius); padding: .8rem 1rem; margin-top: 1rem; }
.device-card .big-id { font-size: 1.5rem; font-weight: 700; font-family: ui-monospace, Consolas, monospace; letter-spacing: .05em; }
.log { background: var(--code-bg); color: var(--code-text); border-radius: 6px; padding: .6rem .8rem; height: 260px; overflow-y: auto;
  font-family: ui-monospace, Consolas, monospace; font-size: .8rem; white-space: pre-wrap; }
.log .ok { color: #6fdc8c; }
.log .bad { color: #ff8389; }
.log .warn { color: #f1c21b; }
pre.code { background: var(--code-bg); color: var(--code-text); padding: .75rem; border-radius: 6px; overflow-x: auto; }
.pager { display: flex; gap: 1rem; justify-content: flex-end; margin-top: .5rem; }
footer { text-align: center; color: var(--muted); font-size: .8rem; padding: 1rem; }