:root {
  --bg: #06080d;
  --panel: #0d121c;
  --panel-2: #121a26;
  --line: rgba(255, 255, 255, .09);
  --line-2: rgba(255, 255, 255, .16);
  --text: #e8eef8;
  --dim: #a9b6c9;
  --muted: #6f7d92;
  --accent: #4cc2ff;
  --accent-2: #a78bfa;
  --green: #37d399;
  --red: #ff6b6b;
  --glow-a: rgba(76, 194, 255, .12);
  --glow-b: rgba(167, 139, 250, .12);
  --code-bg: #080c13;
  --out-bg: #070b11;
  --hover: rgba(255, 255, 255, .05);
  --mono: "Cascadia Mono", Consolas, "JetBrains Mono", ui-monospace, monospace;
  --sans: "Segoe UI", "Microsoft YaHei", -apple-system, sans-serif;
  --fs-scale: 1;
  --row-h: 1;
}

html[data-theme="light"] {
  --bg: #f5f7fb;
  --panel: #ffffff;
  --panel-2: #eef2f8;
  --line: rgba(15, 23, 42, .12);
  --line-2: rgba(15, 23, 42, .22);
  --text: #0f172a;
  --dim: #3f4c60;
  --muted: #6b7a90;
  --accent: #0b7fc4;
  --accent-2: #6d4bd8;
  --green: #0f9d63;
  --red: #d1382f;
  --glow-a: rgba(11, 127, 196, .1);
  --glow-b: rgba(109, 75, 216, .1);
  --code-bg: #ffffff;
  --out-bg: #fbfcfe;
  --hover: rgba(15, 23, 42, .04);
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  min-height: 100vh;
  background:
    radial-gradient(900px 500px at 15% -10%, var(--glow-a), transparent 60%),
    radial-gradient(800px 460px at 90% 0%, var(--glow-b), transparent 60%),
    var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: calc(14px * var(--fs-scale));
  transition: background-color .2s, color .2s;
}

a { color: inherit; text-decoration: none; }
button, input, textarea, select { font: inherit; color: inherit; }

/* ---------- 顶栏 ---------- */
.top {
  display: flex; align-items: center; gap: 14px;
  padding: 12px 22px;
  border-bottom: 1px solid var(--line);
  background: rgba(6, 8, 13, .72);
  backdrop-filter: blur(12px);
  position: sticky; top: 0; z-index: 30;
}
html[data-theme="light"] .top { background: rgba(245, 247, 251, .82); }
.brand { display: flex; align-items: center; gap: 10px; }
.brand img { width: 30px; height: 30px; border-radius: 9px; }
.brand b { display: block; font-size: calc(14px * var(--fs-scale)); }
.brand em {
  font-style: normal; color: var(--muted);
  font-size: calc(10px * var(--fs-scale)); letter-spacing: .16em; text-transform: uppercase;
}
.top nav { display: flex; gap: 4px; margin-left: 6px; }
.top nav a {
  padding: 7px 11px; border-radius: 8px;
  color: var(--dim); font-size: calc(13px * var(--fs-scale));
  transition: .16s;
}
.top nav a:hover { color: var(--text); background: var(--hover); }
.grow { flex: 1; }

.toolbar { display: flex; align-items: center; gap: 4px; position: relative; }
.iconbtn {
  display: grid; place-items: center;
  width: 32px; height: 32px;
  border: 1px solid transparent;
  border-radius: 8px;
  background: transparent;
  color: var(--dim);
  cursor: pointer;
  transition: .16s;
}
.iconbtn:hover:not(:disabled) { background: var(--hover); color: var(--text); }
.iconbtn:disabled { opacity: .3; cursor: default; }
.iconbtn svg { width: 17px; height: 17px; fill: currentColor; }
.iconbtn.on { background: var(--hover); color: var(--text); }

/* ---------- 弹层 ---------- */
.pop {
  position: absolute; top: 40px; right: 0;
  width: 320px; max-width: calc(100vw - 40px);
  padding: 10px;
  border: 1px solid var(--line-2);
  border-radius: 12px;
  background: var(--panel);
  box-shadow: 0 24px 60px rgba(0, 0, 0, .45);
  z-index: 40;
}
.pop[hidden] { display: none; }
.pop h3 { margin: 4px 6px 8px; font-size: calc(12px * var(--fs-scale)); color: var(--muted); font-weight: 600; }
.histlist { max-height: 320px; overflow: auto; }
.histitem {
  display: flex; align-items: baseline; gap: 8px;
  padding: 7px 8px; border-radius: 8px;
  cursor: pointer; font-size: calc(12.5px * var(--fs-scale));
}
.histitem:hover { background: var(--hover); }
.histitem b {
  font-family: var(--mono); font-weight: 500;
  color: var(--accent); flex-shrink: 0;
  font-size: calc(10.5px * var(--fs-scale));
}
.histitem span {
  flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  font-family: var(--mono); color: var(--text);
}
.histitem em { font-style: normal; color: var(--muted); font-size: calc(10.5px * var(--fs-scale)); }
.histitem.cur { background: color-mix(in srgb, var(--accent) 14%, transparent); }
.popempty { padding: 16px 10px; color: var(--muted); font-size: calc(12px * var(--fs-scale)); text-align: center; }

.prefrow { display: flex; align-items: center; gap: 10px; padding: 8px 6px; }
.prefrow label { flex: 0 0 56px; color: var(--dim); font-size: calc(12.5px * var(--fs-scale)); }
.prefrow input[type=range] { flex: 1; accent-color: var(--accent); }
.prefrow output { width: 46px; text-align: right; color: var(--muted); font-size: calc(11.5px * var(--fs-scale)); font-family: var(--mono); }
.seg { display: flex; gap: 6px; padding: 4px 6px 8px; }
.seg button {
  flex: 1; padding: 6px 8px; border-radius: 8px;
  border: 1px solid var(--line); background: transparent;
  color: var(--dim); cursor: pointer; font-size: calc(12px * var(--fs-scale));
}
.seg button.on { border-color: var(--accent); color: var(--accent); background: color-mix(in srgb, var(--accent) 12%, transparent); }

/* ---------- 主体 ---------- */
.wrap { max-width: 1280px; margin: 0 auto; padding: 30px 22px 70px; }
.intro h1 { margin: 0 0 8px; font-size: calc(28px * var(--fs-scale)); letter-spacing: -.02em; }
.intro p { margin: 0 0 24px; color: var(--dim); font-size: calc(14px * var(--fs-scale)); }

.intro__row { display: flex; align-items: flex-end; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.modes { display: flex; align-items: center; gap: 12px; }
.modes select {
  padding: 7px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--code-bg);
  color: var(--text);
  font-size: calc(13px * var(--fs-scale));
}
.engine {
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--muted);
  font-size: calc(11.5px * var(--fs-scale));
  white-space: nowrap;
}
.engine--ok { color: var(--green); border-color: color-mix(in srgb, var(--green) 40%, transparent); background: color-mix(in srgb, var(--green) 10%, transparent); }
.engine--warn { color: #d99a2b; border-color: rgba(217, 154, 43, .4); background: rgba(217, 154, 43, .1); }

.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.pane {
  display: flex; flex-direction: column;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel);
}
.pane__head { display: flex; align-items: baseline; gap: 10px; margin-bottom: 10px; }
.pane__head h2 { margin: 0; font-size: calc(15px * var(--fs-scale)); }
.hint { color: var(--muted); font-size: calc(11.5px * var(--fs-scale)); }
.hint code { color: var(--dim); font-family: var(--mono); }

textarea {
  width: 100%;
  min-height: 190px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--code-bg);
  color: var(--text);
  font-family: var(--mono);
  font-size: calc(13px * var(--fs-scale));
  line-height: calc(1.65 * var(--row-h));
  resize: vertical;
  outline: none;
  transition: border-color .18s, box-shadow .18s;
}
textarea:focus { border-color: color-mix(in srgb, var(--accent) 55%, transparent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 12%, transparent); }

.row { display: flex; align-items: center; gap: 12px; margin: 12px 0 6px; }
.field { display: flex; align-items: center; gap: 8px; color: var(--muted); font-size: calc(12.5px * var(--fs-scale)); }
.field input {
  width: 96px; padding: 6px 9px;
  border: 1px solid var(--line); border-radius: 8px;
  background: var(--code-bg);
  font-family: var(--mono); font-size: calc(12.5px * var(--fs-scale));
}

.btn {
  padding: 8px 16px; border-radius: 9px;
  border: 1px solid var(--line-2);
  background: transparent;
  color: var(--text); cursor: pointer;
  font-size: calc(13px * var(--fs-scale));
  transition: .18s;
}
.btn:hover { background: var(--hover); }
.btn--primary {
  border: 0; color: #06080d; font-weight: 650;
  background: linear-gradient(120deg, #38bdf8, #8b5cf6);
  box-shadow: 0 8px 24px rgba(56, 189, 248, .22);
}
.btn--primary:hover { box-shadow: 0 12px 30px rgba(139, 92, 246, .3); }

/* ---------- 输出 ---------- */
.out {
  margin-top: 12px;
  max-height: 320px;
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--out-bg);
  font-family: var(--mono);
  font-size: calc(12.5px * var(--fs-scale));
}
.line {
  display: grid;
  grid-template-columns: 92px 132px 1fr;
  gap: 10px;
  padding: calc(5px * var(--row-h)) 12px;
  border-bottom: 1px solid var(--line);
  cursor: pointer;
  line-height: calc(1.5 * var(--row-h));
}
.line:last-of-type { border-bottom: 0; }
.line:hover { background: color-mix(in srgb, var(--accent) 8%, transparent); }
.line.flash { background: color-mix(in srgb, var(--green) 20%, transparent); }
.addr { color: var(--muted); }
.bytes { color: var(--accent); }
.src { color: var(--text); }
.sum {
  padding: 8px 12px; color: var(--muted);
  font-size: calc(11.5px * var(--fs-scale));
  border-top: 1px solid var(--line);
}
.err {
  padding: 10px 12px;
  color: var(--red);
  background: color-mix(in srgb, var(--red) 8%, transparent);
  border-bottom: 1px solid color-mix(in srgb, var(--red) 20%, transparent);
}

/* ---------- 速查表 ---------- */
.ref { margin-top: 34px; }
.ref__head { display: flex; align-items: center; gap: 16px; margin-bottom: 12px; }
.ref__head h2 { margin: 0; font-size: calc(18px * var(--fs-scale)); }
.ref__head input {
  flex: 1; max-width: 320px;
  padding: 8px 12px;
  border: 1px solid var(--line); border-radius: 9px;
  background: var(--code-bg);
  font-size: calc(13px * var(--fs-scale));
}
.tablewrap { border: 1px solid var(--line); border-radius: 12px; overflow: hidden; }
table { width: 100%; border-collapse: collapse; font-size: calc(13px * var(--fs-scale)); }
thead th {
  text-align: left; padding: calc(10px * var(--row-h)) 14px;
  background: var(--panel-2);
  color: var(--muted);
  font-size: calc(11px * var(--fs-scale));
  letter-spacing: .08em; text-transform: uppercase;
}
tbody td { padding: calc(9px * var(--row-h)) 14px; border-top: 1px solid var(--line); }
tbody tr:hover td { background: var(--hover); }
.mn { color: var(--accent-2); font-family: var(--mono); font-weight: 600; }
.mono { font-family: var(--mono); color: var(--dim); }
.b { color: var(--green); }
.dim { color: var(--muted); }

@media (max-width: 900px) {
  .grid { grid-template-columns: 1fr; }
  .line { grid-template-columns: 84px 1fr; }
  .line .bytes { grid-column: 2; }
  .line .src { grid-column: 1 / -1; color: var(--dim); }
  .pop { right: 0; }
}