:root {
  --bg: #0f141c;
  --panel: #171e2a;
  --panel2: #1d2634;
  --line: #2a3548;
  --text: #e7edf6;
  --muted: #8b97ab;
  --accent: #ff7a18;
  --primary: #2f9e6b;
  --warn: #d4a017;
  --err: #e05a4f;
  --ok: #3ecf8e;
  --mono: "Cascadia Code", "Fira Code", "Consolas", ui-monospace, monospace;
  --sans: "Segoe UI", "Trebuchet MS", sans-serif;
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; background: var(--bg); color: var(--text); font-family: var(--sans); }
body { display: flex; flex-direction: column; min-height: 100vh; }
.top {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 10px 16px; background: #121924; border-bottom: 1px solid var(--line);
}
.brand { display: flex; gap: 12px; align-items: center; }
.logo {
  width: 42px; height: 42px; border-radius: 10px; background: linear-gradient(135deg, #ff7a18, #ffb347);
  color: #1a1208; font-weight: 800; display: grid; place-items: center; letter-spacing: -1px;
}
.brand h1 { margin: 0; font-size: 18px; }
.brand p { margin: 0; color: var(--muted); font-size: 12px; }
.toolbar { display: flex; flex-wrap: wrap; gap: 8px; }
.btn {
  border: 1px solid var(--line); background: var(--panel2); color: var(--text);
  padding: 8px 12px; border-radius: 8px; cursor: pointer; font-weight: 600;
}
.btn:hover { filter: brightness(1.12); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn.primary { background: var(--primary); border-color: transparent; color: #062015; }
.btn.accent { background: var(--accent); border-color: transparent; color: #2a1400; }
.btn.ghost { background: transparent; }
.btn.sm { padding: 6px 10px; font-size: 12px; }
.toolbar select {
  background: var(--panel2); color: var(--text); border: 1px solid var(--line);
  border-radius: 8px; padding: 8px 10px; font-weight: 600;
}
.layout {
  flex: 1; display: grid; grid-template-columns: 280px 1fr 340px; min-height: 0;
}
.side, .console-wrap {
  background: var(--panel); border-right: 1px solid var(--line); overflow: auto; padding: 14px;
}
.console-wrap { border-right: 0; border-left: 1px solid var(--line); padding: 0; display: flex; flex-direction: column; }
.side h2 { font-size: 13px; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); margin: 8px 0; }
.side section { margin-bottom: 18px; }
.chip-row { display: flex; flex-wrap: wrap; gap: 6px; }
.chip { background: #243044; border-radius: 999px; padding: 3px 8px; font-size: 11px; }
.muted { color: var(--muted); font-size: 12px; line-height: 1.45; }
.ports { width: 100%; border-collapse: collapse; font-size: 12px; }
.ports th, .ports td { text-align: left; padding: 5px 4px; border-bottom: 1px solid var(--line); }
.ports th { color: var(--muted); font-weight: 600; }
.examples { display: flex; flex-direction: column; gap: 6px; }
.ex {
  text-align: left; background: var(--panel2); border: 1px solid var(--line); color: var(--text);
  border-radius: 8px; padding: 8px; cursor: pointer;
}
.ex:hover, .ex.on { border-color: var(--accent); }
.ex b { display: block; font-size: 13px; }
.ex small { color: var(--muted); }
.guide { padding-left: 18px; font-size: 13px; line-height: 1.5; }
.editor-wrap { display: flex; flex-direction: column; min-width: 0; min-height: 0; }
.editor-bar {
  display: flex; gap: 12px; align-items: center; padding: 6px 12px;
  border-bottom: 1px solid var(--line); font-size: 12px; color: var(--muted);
}
.hint { color: #ffc27a; flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.editor { display: flex; flex: 1; min-height: 0; background: #0d1219; }
#gutter {
  margin: 0; padding: 12px 8px; min-width: 42px; text-align: right;
  color: #55627a; background: #0b1016; font: 13px/1.5 var(--mono); user-select: none; overflow: hidden;
}
#code {
  flex: 1; border: 0; outline: 0; resize: none; padding: 12px; color: #d8e4f5;
  background: transparent; font: 13px/1.5 var(--mono); tab-size: 2; white-space: pre; overflow: auto;
}
.tabs { display: flex; border-bottom: 1px solid var(--line); }
.tab {
  flex: 1; background: transparent; color: var(--muted); border: 0; padding: 10px;
  cursor: pointer; font-weight: 700; font-size: 12px;
}
.tab.on { color: var(--text); border-bottom: 2px solid var(--accent); }
.panel { display: none; flex: 1; min-height: 0; overflow: auto; padding: 12px; }
.panel.on { display: block; }
#log, #serialOut {
  margin: 0; white-space: pre-wrap; word-break: break-word; font: 12px/1.45 var(--mono); color: #c9d6e8;
}
#log.ok { color: var(--ok); }
#log.err { color: #ffb4ad; }
.size { margin-top: 12px; display: grid; gap: 8px; font-size: 12px; }
.size.hidden { display: none; }
.size > div { display: grid; grid-template-columns: 48px 1fr 90px; gap: 8px; align-items: center; }
.bar { height: 8px; background: #243044; border-radius: 99px; overflow: hidden; }
.bar i { display: block; height: 100%; width: 0; background: var(--ok); }
.serial-tools { display: flex; gap: 8px; margin-bottom: 8px; }
#serialForm { display: flex; gap: 8px; margin-top: 8px; }
#serialIn, select {
  flex: 1; background: #0d1219; color: var(--text); border: 1px solid var(--line); border-radius: 8px; padding: 8px;
}
.help h3 { font-size: 13px; margin: 12px 0 6px; color: #ffc27a; }
.help pre { background: #0d1219; padding: 8px; border-radius: 8px; font: 12px var(--mono); overflow: auto; }
footer { padding: 8px 16px; color: var(--muted); font-size: 11px; border-top: 1px solid var(--line); }
@media (max-width: 1100px) {
  .layout { grid-template-columns: 1fr; }
  .side, .console-wrap { max-height: 360px; }
}