:root {
  --bg: #080a0e;
  --bg-2: #0d1117;
  --panel: #11161f;
  --panel-2: #161c27;
  --line: #232b38;
  --line-2: #2f3949;
  --fg: #e6ebf2;
  --fg-dim: #93a1b5;
  --fg-mute: #64748b;
  --accent: #38bdf8;
  --accent-2: #22d3ee;
  --ok: #34d399;
  --warn: #fbbf24;
  --err: #f87171;
  --mono: "JetBrains Mono", "Cascadia Code", Consolas, "SFMono-Regular", Menlo, monospace;
  --sans: "Inter", -apple-system, "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif;
  --radius: 10px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 14px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

body {
  background-image:
    radial-gradient(900px 500px at 12% -10%, rgba(56, 189, 248, 0.10), transparent 60%),
    radial-gradient(700px 400px at 88% 0%, rgba(34, 211, 238, 0.06), transparent 60%);
  background-repeat: no-repeat;
  min-height: 100vh;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-2); }

.wrap { width: 100%; max-width: 1360px; margin: 0 auto; padding: 0 20px; }

/* ---------- 顶栏 ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px);
  background: rgba(8, 10, 14, 0.82);
  border-bottom: 1px solid var(--line);
}
.topbar__inner {
  display: flex;
  align-items: center;
  gap: 28px;
  height: 58px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: var(--fg);
  font-weight: 600;
  letter-spacing: 0.2px;
  white-space: nowrap;
}
.brand:hover { color: var(--fg); }
.brand__mark {
  width: 10px;
  height: 10px;
  border-radius: 2px;
  background: linear-gradient(135deg, var(--accent), var(--ok));
  box-shadow: 0 0 12px rgba(56, 189, 248, 0.55);
}
.nav { display: flex; gap: 4px; flex-wrap: wrap; }
.nav a {
  color: var(--fg-dim);
  padding: 6px 11px;
  border-radius: 7px;
  font-size: 13px;
}
.nav a:hover { color: var(--fg); background: var(--panel-2); }
.nav a[aria-current="page"] { color: var(--accent); background: rgba(56, 189, 248, 0.10); }

/* ---------- 页头 ---------- */
.page-head { padding: 40px 0 22px; }
.page-head h1 {
  margin: 0 0 8px;
  font-size: 27px;
  font-weight: 650;
  letter-spacing: -0.4px;
}
.page-head p { margin: 0; color: var(--fg-dim); max-width: 760px; }
.kicker {
  display: inline-block;
  margin-bottom: 12px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--accent);
  opacity: 0.85;
}

/* ---------- 首页卡片 ---------- */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 16px;
  padding-bottom: 24px;
}
.tool-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--panel), var(--bg-2));
  color: var(--fg);
  transition: border-color 0.18s, transform 0.18s, box-shadow 0.18s;
}
.tool-card:hover {
  border-color: rgba(56, 189, 248, 0.45);
  transform: translateY(-2px);
  box-shadow: 0 14px 34px -18px rgba(56, 189, 248, 0.55);
  color: var(--fg);
}
.tool-card__icon {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border-radius: 9px;
  background: rgba(56, 189, 248, 0.10);
  border: 1px solid rgba(56, 189, 248, 0.22);
  color: var(--accent);
  font-family: var(--mono);
  font-size: 15px;
}
.tool-card h2 { margin: 0; font-size: 16px; font-weight: 600; }
.tool-card p { margin: 0; color: var(--fg-dim); font-size: 13px; }
.tool-card__tags { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 2px; }
.tag {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--fg-mute);
  border: 1px solid var(--line-2);
  border-radius: 5px;
  padding: 1px 7px;
}

/* ---------- 工作区 ---------- */
.layout {
  display: grid;
  grid-template-columns: 330px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  padding-bottom: 40px;
}
@media (max-width: 980px) {
  .layout { grid-template-columns: 1fr; }
}

.panel {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  overflow: hidden;
}
.panel + .panel { margin-top: 14px; }
.panel__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 11px 14px;
  border-bottom: 1px solid var(--line);
  background: var(--panel-2);
}
.panel__head h3 {
  margin: 0;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--fg-dim);
}
.panel__body { padding: 14px; }
.panel__body--flush { padding: 0; }

/* ---------- 表单 ---------- */
.field { margin-bottom: 12px; }
.field:last-child { margin-bottom: 0; }
.field > label {
  display: block;
  margin-bottom: 5px;
  font-size: 12px;
  color: var(--fg-dim);
}
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }

input[type="text"],
input[type="number"],
select,
textarea {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--line-2);
  border-radius: 7px;
  background: var(--bg);
  color: var(--fg);
  font-family: inherit;
  font-size: 13px;
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}
input:focus, select:focus, textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.13);
}
textarea { resize: vertical; font-family: var(--mono); line-height: 1.65; }
select { cursor: pointer; }

.check {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 13px;
  color: var(--fg-dim);
  cursor: pointer;
  user-select: none;
}
.check input { accent-color: var(--accent); width: 14px; height: 14px; cursor: pointer; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 14px;
  border: 1px solid var(--line-2);
  border-radius: 7px;
  background: var(--panel-2);
  color: var(--fg);
  font-family: inherit;
  font-size: 13px;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s, color 0.15s;
  white-space: nowrap;
}
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }
.btn:disabled:hover { border-color: var(--line-2); color: var(--fg); }
.btn--primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #04121b;
  font-weight: 600;
}
.btn--primary:hover { background: var(--accent-2); border-color: var(--accent-2); color: #04121b; }
.btn--ok { background: var(--ok); border-color: var(--ok); color: #04140d; font-weight: 600; }
.btn--ok:hover { background: #4ade80; border-color: #4ade80; color: #04140d; }
.btn--err { color: var(--err); border-color: rgba(248, 113, 113, 0.4); }
.btn--err:hover { background: rgba(248, 113, 113, 0.12); border-color: var(--err); color: var(--err); }
.btn--sm { padding: 5px 10px; font-size: 12px; }
.btn-row { display: flex; gap: 8px; flex-wrap: wrap; }

/* ---------- 预览区 ---------- */
.preview-wrap {
  display: grid;
  place-items: center;
  padding: 22px;
  background:
    linear-gradient(45deg, #0b0f15 25%, transparent 25%) -8px 0/16px 16px,
    linear-gradient(-45deg, #0b0f15 25%, transparent 25%) -8px 0/16px 16px,
    linear-gradient(45deg, transparent 75%, #0b0f15 75%) -8px 0/16px 16px,
    linear-gradient(-45deg, transparent 75%, #0b0f15 75%) -8px 0/16px 16px,
    var(--bg-2);
  overflow: auto;
  min-height: 220px;
}
#dotCanvas { image-rendering: pixelated; cursor: crosshair; }

.code-out {
  width: 100%;
  min-height: 260px;
  border: 0;
  border-radius: 0;
  background: #070a0e;
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 1.7;
  color: #a5f3d0;
  padding: 14px;
  resize: vertical;
  white-space: pre;
  overflow: auto;
}

.hint {
  font-size: 12px;
  color: var(--fg-mute);
  line-height: 1.6;
}
.hint--warn { color: var(--warn); }

.status-dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--fg-mute);
  margin-right: 6px;
  vertical-align: middle;
}
.status-dot--on { background: var(--ok); box-shadow: 0 0 8px var(--ok); }
.status-dot--err { background: var(--err); }

/* ---------- 串口 ---------- */
.term {
  background: #05080c;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 12px 14px;
  height: 46vh;
  min-height: 280px;
  overflow-y: auto;
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 1.65;
  white-space: pre-wrap;
  word-break: break-all;
}
.term .rx { color: #7dd3fc; }
.term .tx { color: #86efac; }
.term .sys { color: var(--fg-mute); }
.term .err { color: var(--err); }

.order-tabs { display: flex; gap: 6px; margin-bottom: 14px; flex-wrap: wrap; }
.order-tab {
  padding: 6px 12px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--panel);
  color: var(--fg-dim);
  font-size: 13px;
  cursor: pointer;
}
.order-tab[aria-selected="true"] {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(56, 189, 248, 0.09);
}

/* ---------- 二维码 ---------- */
#qrCanvas {
  border-radius: 8px;
  background: #fff;
  max-width: 100%;
  height: auto;
  image-rendering: pixelated;
}

.name-list {
  margin: 0 0 40px;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
  max-width: 720px;
}
.name-list li { border-bottom: 1px solid var(--line); }
.name-list a {
  display: block;
  padding: 18px 4px;
  font-size: 18px;
  color: var(--fg);
  transition: color 0.15s, padding-left 0.15s;
}
.name-list a:hover { color: var(--accent); padding-left: 12px; }

.toast {
  position: fixed;
  left: 50%;
  bottom: 28px;
  transform: translate(-50%, 16px);
  padding: 9px 18px;
  border-radius: 8px;
  background: var(--panel-2);
  border: 1px solid var(--line-2);
  color: var(--fg);
  font-size: 13px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.22s, transform 0.22s;
  z-index: 200;
}
.toast--show { opacity: 1; transform: translate(-50%, 0); }

.foot {
  border-top: 1px solid var(--line);
  padding: 20px 0 30px;
  color: var(--fg-mute);
  font-size: 12px;
}
.foot__inner { display: flex; gap: 10px 20px; flex-wrap: wrap; justify-content: space-between; }
.foot a { color: var(--fg-mute); }
.foot a:hover { color: var(--accent); }

.badge {
  font-family: var(--mono);
  font-size: 11px;
  padding: 1px 6px;
  border-radius: 4px;
  background: rgba(56, 189, 248, 0.12);
  color: var(--accent);
  border: 1px solid rgba(56, 189, 248, 0.2);
}

/* ---------- 视觉精修 ---------- */

:root {
  --bg: #0a0e13;
  --bg-2: #0e141b;
  --panel: rgba(20, 27, 36, 0.92);
  --panel-2: rgba(30, 39, 51, 0.92);
  --line: rgba(255, 255, 255, 0.07);
  --line-2: rgba(255, 255, 255, 0.13);
  --fg: #e8eef6;
  --fg-dim: #9aa8ba;
  --fg-mute: #6b7a8d;
  --accent: #4cc2ff;
  --accent-2: #85dcff;
  --ok: #3ddc97;
  --radius: 14px;
}

body {
  background:
    radial-gradient(1100px 620px at 50% -22%, rgba(76, 194, 255, 0.10), transparent 62%),
    linear-gradient(180deg, #0a0e13 0%, #080b0f 70%);
  background-repeat: no-repeat;
  background-attachment: fixed;
}

.topbar {
  background: rgba(10, 14, 19, 0.78);
  border-bottom: 1px solid var(--line);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.03);
}
.topbar__inner { height: 56px; gap: 24px; }
.brand { font-size: 14.5px; letter-spacing: 0.3px; }
.brand__mark {
  width: 9px; height: 9px; border-radius: 3px;
  box-shadow: 0 0 14px rgba(76, 194, 255, 0.7);
}
.nav { gap: 2px; }
.nav a {
  padding: 7px 14px;
  border-radius: 999px;
  font-size: 13.5px;
  transition: background 0.16s, color 0.16s;
}
.nav a:hover { background: rgba(255, 255, 255, 0.05); }
.nav a[aria-current="page"] {
  color: #04121b;
  background: var(--accent);
  font-weight: 600;
}
.nav a[aria-current="page"]:hover { background: var(--accent-2); color: #04121b; }

.page-head { padding: 44px 0 26px; }
.page-head h1 { font-size: 28px; letter-spacing: -0.6px; margin-bottom: 10px; }
.page-head p { color: var(--fg-dim); line-height: 1.75; }
.kicker { letter-spacing: 2.6px; opacity: 0.7; }

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 18px 40px -30px rgba(0, 0, 0, 0.9);
  backdrop-filter: blur(10px);
}
.panel__head {
  background: rgba(255, 255, 255, 0.025);
  border-bottom: 1px solid var(--line);
  padding: 12px 16px;
}
.panel__head h3 { letter-spacing: 1.6px; color: var(--fg-dim); }
.panel__body { padding: 16px; }

.field > label { color: var(--fg-dim); margin-bottom: 6px; }
input[type="text"],
input[type="number"],
select,
textarea {
  background: rgba(0, 0, 0, 0.32);
  border: 1px solid var(--line-2);
  border-radius: 9px;
  padding: 9px 11px;
  transition: border-color 0.15s, box-shadow 0.15s, background 0.15s;
}
input[type="text"]:hover,
input[type="number"]:hover,
select:hover,
textarea:hover { border-color: rgba(255, 255, 255, 0.2); }
input:focus, select:focus, textarea:focus {
  background: rgba(0, 0, 0, 0.45);
  border-color: rgba(76, 194, 255, 0.65);
  box-shadow: 0 0 0 4px rgba(76, 194, 255, 0.12);
}

.btn {
  border-radius: 10px;
  padding: 9px 16px;
  border: 1px solid var(--line-2);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.055), rgba(255, 255, 255, 0.018));
  transition: transform 0.15s, box-shadow 0.15s, border-color 0.15s, background 0.15s, color 0.15s;
}
.btn:hover {
  transform: translateY(-1px);
  border-color: rgba(76, 194, 255, 0.5);
  box-shadow: 0 10px 24px -16px rgba(76, 194, 255, 0.9);
}
.btn:active { transform: translateY(0); }
.btn--primary {
  background: linear-gradient(180deg, var(--accent), #2ba6e0);
  border-color: transparent;
  color: #04121b;
  box-shadow: 0 10px 26px -14px rgba(76, 194, 255, 0.95);
}
.btn--primary:hover {
  background: linear-gradient(180deg, var(--accent-2), #3fb3ea);
  border-color: transparent;
  color: #04121b;
}
.btn--ok { background: linear-gradient(180deg, var(--ok), #22b87a); border-color: transparent; color: #04140d; }
.btn--ok:hover { background: linear-gradient(180deg, #5ce8ae, #2fc98a); border-color: transparent; color: #04140d; }
.btn--sm { padding: 6px 12px; border-radius: 8px; }

.name-list { border-top: 1px solid var(--line); }
.name-list li { border-bottom: 1px solid var(--line); }
.name-list a {
  font-size: 19px;
  padding: 20px 6px;
  letter-spacing: 0.2px;
  transition: color 0.16s, padding-left 0.18s, background 0.16s;
}
.name-list a::after {
  content: "→";
  float: right;
  opacity: 0;
  transform: translateX(-6px);
  transition: opacity 0.18s, transform 0.18s;
}
.name-list a:hover { padding-left: 16px; background: rgba(255, 255, 255, 0.02); }
.name-list a:hover::after { opacity: 0.9; transform: translateX(0); }

.preview-wrap {
  background:
    linear-gradient(45deg, rgba(255, 255, 255, 0.022) 25%, transparent 25%) -8px 0/16px 16px,
    linear-gradient(-45deg, rgba(255, 255, 255, 0.022) 25%, transparent 25%) -8px 0/16px 16px,
    linear-gradient(45deg, transparent 75%, rgba(255, 255, 255, 0.022) 75%) -8px 0/16px 16px,
    linear-gradient(-45deg, transparent 75%, rgba(255, 255, 255, 0.022) 75%) -8px 0/16px 16px,
    #0b1017;
}
#dotCanvas, #qrCanvas { border-radius: 10px; box-shadow: 0 12px 30px -20px rgba(0, 0, 0, 0.9); }

.code-out {
  background: #070b10;
  color: #9ff0c8;
  font-size: 12.5px;
  line-height: 1.8;
  padding: 16px;
}

.term {
  background: #060a0f;
  border: 1px solid var(--line);
  border-radius: 12px;
  line-height: 1.7;
}
.term .rx { color: #7dd3fc; }
.term .tx { color: #7ef0b4; }

.order-tab {
  border-radius: 999px;
  padding: 7px 16px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--line);
  transition: all 0.15s;
}
.order-tab[aria-selected="true"] {
  background: rgba(76, 194, 255, 0.14);
  border-color: rgba(76, 194, 255, 0.5);
  color: var(--accent);
}

.hint { color: var(--fg-mute); }

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255, 255, 255, 0.13); border-radius: 6px; border: 2px solid transparent; background-clip: content-box; }
::-webkit-scrollbar-thumb:hover { background: rgba(255, 255, 255, 0.22); background-clip: content-box; }