:root {
  --bg: #0a0e14; --bg2: #0d1320; --panel: #161c28; --panel2: #1b2333;
  --border: #2a3447; --border-soft: #222b3c;
  --text: #eaf0fb; --muted: #93a0b8; --accent: #4d9bff; --accent2: #8b5cf6;
  --good: #46d369; --bad: #ff5a4f; --warn: #f0b429;
  --glow: 0 0 0 1px rgba(77,155,255,.0), 0 8px 30px rgba(0,0,0,.45);
  --radius: 16px;
}
* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  color: var(--text);
  font-size: 14.5px;
  line-height: 1.55;
  background:
    radial-gradient(900px 600px at 12% -10%, rgba(77,155,255,.18), transparent 60%),
    radial-gradient(800px 500px at 100% 0%, rgba(139,92,246,.16), transparent 55%),
    radial-gradient(700px 700px at 50% 120%, rgba(70,211,105,.08), transparent 60%),
    var(--bg);
  background-attachment: fixed;
}
/* faint dotted grid overlay for texture */
body::before {
  content: ""; position: fixed; inset: 0; pointer-events: none; z-index: 0;
  background-image: radial-gradient(rgba(255,255,255,.035) 1px, transparent 1px);
  background-size: 26px 26px;
}
body > * { position: relative; z-index: 1; }

/* ---------- header ---------- */
header {
  padding: 18px 30px;
  display: flex; align-items: center; gap: 16px; flex-wrap: wrap;
  border-bottom: 1px solid var(--border-soft);
  background: linear-gradient(180deg, rgba(20,27,40,.85), rgba(13,19,32,.55));
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  position: sticky; top: 0; z-index: 20;
  box-shadow: 0 10px 40px -20px rgba(0,0,0,.9);
}
header h1 {
  font-size: 25px; margin: 0; font-weight: 800; letter-spacing: -.02em;
  background: linear-gradient(110deg, #ffffff 10%, var(--accent) 55%, var(--accent2) 95%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  text-shadow: 0 2px 30px rgba(77,155,255,.25);
}
.sub { color: var(--muted); font-size: 13.5px; }

main { padding: 30px 26px 56px; max-width: 1080px; margin: 0 auto; }

/* ---------- panels ---------- */
.panel {
  background: linear-gradient(180deg, var(--panel), var(--panel2));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 24px;
  margin-bottom: 22px;
  box-shadow: var(--glow);
  transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
  animation: rise .5s ease both;
}
.panel:hover {
  transform: translateY(-3px);
  border-color: rgba(77,155,255,.4);
  box-shadow: 0 14px 50px -12px rgba(0,0,0,.6), 0 0 0 1px rgba(77,155,255,.15);
}
@keyframes rise { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: translateY(0); } }
.panel h2 {
  font-size: 16px; margin: 0 0 18px; font-weight: 700; color: var(--text);
  letter-spacing: .01em; display: flex; align-items: center; gap: 11px;
}
.panel h2::before {
  content: ""; width: 5px; height: 19px; border-radius: 6px;
  background: linear-gradient(180deg, var(--accent), var(--accent2));
  box-shadow: 0 0 14px rgba(77,155,255,.6);
}

/* ---------- buttons ---------- */
button {
  background: linear-gradient(180deg, var(--accent), #2f7fe6);
  color: #fff; border: none; border-radius: 10px;
  padding: 11px 19px; font-size: 14.5px; font-weight: 600; cursor: pointer;
  letter-spacing: .01em;
  box-shadow: 0 8px 22px -8px rgba(77,155,255,.7);
  transition: transform .12s ease, box-shadow .2s ease, filter .2s ease;
}
button:hover { transform: translateY(-2px); filter: brightness(1.08); box-shadow: 0 12px 28px -8px rgba(77,155,255,.85); }
button:active { transform: translateY(0); }
button:disabled { opacity: .4; cursor: not-allowed; transform: none; box-shadow: none; filter: grayscale(.3); }
button.secondary {
  background: linear-gradient(180deg, #232c3e, #1a2233);
  border: 1px solid var(--border); box-shadow: 0 6px 18px -10px rgba(0,0,0,.8);
}
button.secondary:hover { border-color: rgba(77,155,255,.5); }
button.danger {
  background: linear-gradient(180deg, #ff6256, #d3392f);
  box-shadow: 0 8px 22px -8px rgba(255,90,79,.7);
}

/* ---------- rows / forms ---------- */
.row { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
label { font-size: 13.5px; color: var(--muted); font-weight: 500; }
select, input {
  background: #0b111d; color: var(--text);
  border: 1px solid var(--border); border-radius: 10px;
  padding: 9px 12px; font-size: 13.5px; font-family: inherit;
  transition: border-color .2s ease, box-shadow .2s ease;
}
select:focus, input:focus {
  outline: none; border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(77,155,255,.18);
}

/* range sliders — artistic accent track + glowing thumb */
input[type=range] {
  -webkit-appearance: none; appearance: none;
  height: 8px; padding: 0; border: none; border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  box-shadow: inset 0 1px 3px rgba(0,0,0,.5);
}
input[type=range]:focus { box-shadow: 0 0 0 4px rgba(77,155,255,.18); }
input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 22px; height: 22px; border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #fff, #cfe2ff 40%, var(--accent) 100%);
  border: 2px solid #fff; cursor: pointer;
  box-shadow: 0 0 0 4px rgba(77,155,255,.25), 0 4px 12px rgba(0,0,0,.5);
  transition: transform .12s ease, box-shadow .2s ease;
}
input[type=range]::-webkit-slider-thumb:hover { transform: scale(1.12); box-shadow: 0 0 0 6px rgba(77,155,255,.3), 0 4px 14px rgba(0,0,0,.6); }
input[type=range]::-moz-range-thumb {
  width: 24px; height: 24px; border-radius: 50%; border: 2px solid #fff;
  background: radial-gradient(circle at 35% 30%, #fff, var(--accent) 100%); cursor: pointer;
  box-shadow: 0 0 0 4px rgba(77,155,255,.25);
}

/* ---------- pills ---------- */
.pill {
  font-size: 13.5px; padding: 5px 14px; border-radius: 999px; font-weight: 700;
  letter-spacing: .02em; border: 1px solid transparent;
}
.pill.good { background: rgba(70,211,105,.16); color: var(--good); border-color: rgba(70,211,105,.35); box-shadow: 0 0 18px -4px rgba(70,211,105,.4); }
.pill.bad  { background: rgba(255,90,79,.16);  color: var(--bad);  border-color: rgba(255,90,79,.35);  box-shadow: 0 0 18px -4px rgba(255,90,79,.4); }
.pill.warn { background: rgba(240,180,41,.16); color: var(--warn); border-color: rgba(240,180,41,.35); animation: pulse 2s ease-in-out infinite; }
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: .55; } }

/* ---------- table ---------- */
table { width: 100%; border-collapse: separate; border-spacing: 0; font-size: 13.5px; }
th, td { text-align: left; padding: 11px 13px; border-bottom: 1px solid var(--border-soft); }
thead th {
  color: var(--muted); font-weight: 600; font-size: 12.5px;
  text-transform: uppercase; letter-spacing: .06em;
  border-bottom: 2px solid var(--border);
}
tbody tr { transition: background .15s ease; }
tbody tr:hover { background: rgba(77,155,255,.06); }
td.mono, .mono { font-family: ui-monospace, "SF Mono", Menlo, monospace; }
td.warn { color: var(--warn); } td.bad { color: var(--bad); } td.good { color: var(--good); }
.empty { color: var(--muted); font-size: 15px; padding: 14px 0; }

/* ---------- log ---------- */
#log {
  font-family: ui-monospace, "SF Mono", Menlo, monospace; font-size: 12.5px; line-height: 1.65;
  background: linear-gradient(180deg, #070b13, #0a1019);
  border: 1px solid var(--border); border-radius: 12px;
  padding: 15px 17px; height: 190px; overflow-y: auto; white-space: pre-wrap;
  box-shadow: inset 0 2px 20px rgba(0,0,0,.5);
}
.log-info { color: var(--muted); } .log-ok { color: var(--good); } .log-err { color: var(--bad); }
.log-raw { color: #6b7a93; }
.raw-toggle {
  display: inline-flex; align-items: center; gap: 7px;
  font-size: 13px; font-weight: 500; color: var(--muted);
  text-transform: none; letter-spacing: 0; cursor: pointer; user-select: none;
}
.raw-toggle input { width: 15px; height: 15px; accent-color: var(--accent); cursor: pointer; }

/* ---------- banners ---------- */
.banner {
  border-radius: 14px; padding: 18px 22px; margin-bottom: 24px; font-size: 15.5px;
  border: 1px solid; display: none;
}
.banner.show { display: block; }
.banner.err  { background: linear-gradient(180deg, rgba(255,90,79,.14), rgba(255,90,79,.05)); border-color: rgba(255,90,79,.5); color: #ffc0bb; }
.banner.info { background: linear-gradient(180deg, rgba(77,155,255,.14), rgba(77,155,255,.05)); border-color: rgba(77,155,255,.5); color: #bcd9ff; }

code {
  background: rgba(77,155,255,.1); border: 1px solid rgba(77,155,255,.25); border-radius: 7px;
  padding: 2px 8px; font-family: ui-monospace, Menlo, monospace; font-size: 14px; color: #cfe2ff;
}
.desc { font-size: 14.5px; color: var(--muted); margin-top: 12px; min-height: 20px; }
.spacer { flex: 1; }
.hint { font-size: 14px; color: var(--muted); }

/* ---------- layout utilities ---------- */
.hidden { display: none; }
.grow { flex: 1; }
.between { justify-content: space-between; }
.m-0 { margin: 0; }
.mt-4 { margin-top: 6px; } .mt-12 { margin-top: 16px; }
.mt-14 { margin-top: 18px; } .mt-16 { margin-top: 22px; }
.mb-6 { margin-bottom: 8px; } .mb-12 { margin-bottom: 16px; } .mb-14 { margin-bottom: 20px; }
.note { margin: 16px 0 0; }
.sel { min-width: 320px; }
.lbl-sm { width: 64px; } .lbl-lg { width: 180px; }
.w-120 { width: 140px; }
.val { width: 150px; text-align: right; font-size: 16px; font-weight: 600; }
.control-row {
  margin: 22px 0; padding: 18px 20px;
  background: rgba(255,255,255,.02); border: 1px solid var(--border-soft); border-radius: 14px;
}

/* ---------- links ---------- */
a { color: var(--accent); text-decoration: none; transition: color .15s ease; }
a:hover { color: #9bc4ff; text-decoration: underline; }

/* ---------- header logos ---------- */
.poweredby { display: flex; align-items: center; gap: 16px; }
.poweredby .sub { font-size: 12px; text-transform: uppercase; letter-spacing: .12em; font-weight: 600; }
.logo { display: block; width: auto; transition: transform .2s ease, filter .2s ease; }
.logo-lerobot { height: 34px; filter: drop-shadow(0 4px 14px rgba(240,160,40,.35)); }
.logo-feetech { height: 34px; background: #fff; border-radius: 8px; padding: 5px 9px; box-shadow: 0 4px 16px rgba(0,0,0,.4); }
.poweredby a { line-height: 0; }
.poweredby a:hover .logo { transform: translateY(-2px) scale(1.04); }

/* ---------- SEO / FAQ footer ---------- */
.seo { margin: 40px 0 8px; }
.seo details {
  background: rgba(255,255,255,.02);
  border: 1px solid var(--border-soft);
  border-radius: 14px;
  padding: 4px 22px;
}
.seo summary {
  cursor: pointer; list-style: none;
  font-size: 14px; font-weight: 600; color: var(--muted);
  padding: 14px 0; user-select: none;
}
.seo summary::-webkit-details-marker { display: none; }
.seo summary::before { content: "› "; color: var(--accent); font-weight: 700; }
.seo details[open] summary::before { content: "⌄ "; }
.seo summary:hover { color: var(--text); }
.seo-body { padding: 4px 0 18px; max-width: 78ch; }
.seo-body h3 { font-size: 15px; color: var(--text); margin: 22px 0 6px; }
.seo-body p { color: var(--muted); line-height: 1.65; font-size: 13.8px; margin: 8px 0; }
.seo-body code { background: rgba(255,255,255,.05); padding: 1px 6px; border-radius: 5px; font-size: .9em; }
.seo-tags { font-size: 12.5px !important; color: #6b7a93 !important; margin-top: 22px !important; }
.seo-errors { margin: 8px 0 4px; }
.seo-errors dt { color: var(--text); font-weight: 600; font-size: 13.6px; margin: 16px 0 4px; }
.seo-errors dt code { background: rgba(255,107,107,.10); color: #ffb4b4; padding: 1px 6px; border-radius: 5px; font-size: .92em; }
.seo-errors dd { margin: 0; color: var(--muted); line-height: 1.6; font-size: 13.6px; }