:root {
  --bg: #121212;
  --lime: #C6F31E;
  --fog: #EDEDED;
  --panel: #2A2A2A;
  --line: #3A3A3A;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: auto; }

body {
  background: var(--bg);
  color: var(--fog);
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.7;
}

svg { display: block; }
a { color: var(--lime); text-decoration: none; }
a:hover { text-decoration: underline; }

.shell {
  width: min(1100px, calc(100% - 32px));
  margin: 0 auto;
}

.bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.mark {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: Consolas, "Cascadia Code", "Courier New", monospace;
  color: var(--lime);
  font-size: 15px;
  letter-spacing: 0.04em;
}

.mark svg { width: 24px; height: 24px; }

.jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  font-size: 13px;
}

.stage {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 28px;
  align-items: center;
  padding: 32px 0 24px;
  border-bottom: 1px solid var(--line);
}

.kb {
  width: 120px;
  height: 80px;
  color: var(--lime);
}

.stage h1 {
  font-family: Consolas, "Cascadia Code", "Courier New", monospace;
  font-size: 26px;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 12px;
}

.stage p {
  margin-bottom: 8px;
  color: #D4D4D4;
  max-width: 46em;
}

.sec {
  padding: 32px 0;
}

.sec h2 {
  font-family: Consolas, "Cascadia Code", "Courier New", monospace;
  font-size: 20px;
  color: var(--lime);
  margin-bottom: 12px;
}

.sec > p { margin-bottom: 14px; max-width: 50em; }

.keys {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.kcard {
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 16px 14px 18px;
}

.kcard svg {
  width: 28px;
  height: 28px;
  color: var(--lime);
  margin-bottom: 8px;
}

.kcard h3 {
  font-family: Consolas, "Courier New", monospace;
  font-size: 15px;
  margin-bottom: 8px;
}

.kcard p { font-size: 14px; color: #D6D6D6; }

.console {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 12px;
}

.console article {
  background: var(--panel);
  padding: 18px 16px;
}

.gridtab {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.gridtab th,
.gridtab td {
  border: 1px solid var(--line);
  padding: 8px 10px;
  text-align: left;
}

.gridtab th {
  background: #1A1A1A;
  color: var(--lime);
  font-family: Consolas, monospace;
}

.paste {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  margin-top: 12px;
}

.paste th,
.paste td {
  border: 1px solid var(--line);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}

.paste th {
  background: var(--lime);
  color: #121212;
}

.paste td { background: var(--panel); }

.rail {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-top: 12px;
  border-left: 3px solid var(--lime);
}

.rail .node {
  padding: 12px 16px 16px;
  background: var(--panel);
  border-bottom: 1px solid var(--line);
}

.rail .node b {
  display: block;
  font-family: Consolas, monospace;
  color: var(--lime);
  margin-bottom: 6px;
}

.pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.pair article {
  background: var(--panel);
  padding: 18px 16px;
}

.pair h3 {
  font-family: Consolas, monospace;
  color: var(--lime);
  margin-bottom: 8px;
}

.fit {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  margin-top: 12px;
}

.fit section {
  padding: 18px 16px;
}

.yes { background: #1B2408; border: 1px solid #3F4D12; }
.no { background: #241C08; border: 1px solid #4D3F12; }

.fit h3 {
  font-family: Consolas, monospace;
  margin-bottom: 8px;
}

.faq details {
  border: 1px solid var(--line);
  background: var(--panel);
  padding: 10px 14px;
  margin-bottom: 8px;
}

.faq summary {
  cursor: pointer;
  font-family: Consolas, monospace;
  color: var(--lime);
}

.faq details p { margin-top: 8px; }

.end {
  border-top: 1px solid var(--line);
  padding: 24px 0 32px;
  font-size: 13px;
  color: #A3A3A3;
}

.end p { margin-bottom: 8px; }

@media (max-width: 860px) {
  .bar, .stage { display: block; }
  .stage { padding-top: 20px; }
  .kb { margin-bottom: 12px; }
  .keys { grid-template-columns: 1fr 1fr; }
  .console, .pair, .fit { grid-template-columns: 1fr; }
  .stage h1 { font-size: 22px; }
}

@media (max-width: 560px) {
  .keys { grid-template-columns: 1fr; }
}