:root {
  --bg: #0d1117;
  --panel: #161b22;
  --border: #21262d;
  --border2: #30363d;
  --text: #e6edf3;
  --dim: #8b949e;
  --accent: #58a6ff;
  --green: #3fb950;
  --mark: #1f6feb33;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--text);
  font: 14px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
}

.brand { display: flex; gap: 12px; align-items: center; }
.logo { font-size: 26px; color: var(--accent); }
h1 { font-size: 17px; letter-spacing: 0.2px; }
.brand p { color: var(--dim); font-size: 12.5px; }

main {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 14px;
  padding: 14px 20px;
  flex: 1;
  min-height: 0;
}

/* ----- code panel ----- */
.code-panel {
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel);
  display: flex;
  flex-direction: column;
  min-height: 520px;
  overflow: hidden;
}

.code-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

.variant-meta { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.chip {
  background: var(--mark);
  border: 1px solid #1f6feb66;
  color: var(--accent);
  padding: 2px 10px;
  border-radius: 999px;
  font-size: 12px;
}
.field { display: flex; align-items: center; gap: 6px; }
.field label { color: var(--dim); font-size: 12px; }
.field input {
  background: var(--bg);
  border: 1px solid var(--border2);
  color: var(--text);
  border-radius: 6px;
  padding: 4px 8px;
  width: 130px;
  font-size: 12.5px;
}
.code-actions { display: flex; align-items: center; gap: 8px; }

.btn {
  background: #21262d;
  border: 1px solid var(--border2);
  color: var(--text);
  border-radius: 6px;
  padding: 6px 12px;
  font-size: 13px;
  cursor: pointer;
  transition: background 0.15s;
}
.btn:hover { background: #30363d; }
.btn.ghost { background: transparent; }
.btn.small { padding: 4px 10px; font-size: 12.5px; }

.code-scroll { overflow: auto; flex: 1; max-height: 640px; }
pre { padding: 12px 0; font-size: 12.5px; line-height: 1.55; }

.ln { display: flex; white-space: pre; min-width: max-content; }
.ln:hover { background: #161b2288; }
.no {
  color: var(--dim);
  opacity: 0.55;
  text-align: right;
  padding: 0 14px 0 12px;
  user-select: none;
  min-width: 52px;
}
.lc { padding-right: 20px; }

.c-k { color: #ff7b72; }
.c-s { color: #a5d6ff; }
.c-n { color: #79c0ff; }
.c-c { color: #6272a4; font-style: italic; }
.mark {
  background: var(--mark);
  color: #7ee787;
  border-radius: 3px;
  padding: 0 2px;
  font-weight: 600;
}

/* ----- side panel ----- */
.side-panel {
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel);
  padding: 14px;
}
.side-panel h2 { font-size: 13px; text-transform: uppercase; letter-spacing: 0.6px; color: var(--dim); margin-bottom: 10px; }

.ver-btn {
  display: block;
  width: 100%;
  text-align: left;
  background: var(--bg);
  border: 1px solid var(--border2);
  border-radius: 8px;
  padding: 10px 12px;
  margin-bottom: 8px;
  cursor: pointer;
  color: var(--text);
  transition: border-color 0.15s;
}
.ver-btn:hover { border-color: var(--accent); }
.ver-btn.active { border-color: var(--accent); background: #1f6feb1a; }
.ver-btn .vt { font-weight: 600; font-size: 14px; }
.ver-btn .vt .tag { color: var(--accent); }
.ver-btn .vd { color: var(--dim); font-size: 12px; margin-top: 2px; }

.side-note { margin-top: 18px; }
.side-note ul { list-style: none; }
.side-note li { color: var(--dim); font-size: 12.5px; padding: 3px 0 3px 14px; position: relative; }
.side-note li::before { content: "▸"; position: absolute; left: 0; color: var(--green); }
.side-note code { color: #79c0ff; font-size: 11.5px; }
.side-note p { color: var(--dim); font-size: 12px; margin-top: 8px; }

/* ----- summary ----- */
.summary {
  padding: 6px 20px 20px;
}
.summary h2 { font-size: 14px; margin: 14px 0 8px; }
.summary h2.mt { margin-top: 22px; }
table {
  width: 100%;
  border-collapse: collapse;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  background: var(--panel);
}
th, td {
  text-align: left;
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  font-size: 13px;
}
th { background: #1c2129; color: var(--dim); font-weight: 600; font-size: 12px; text-transform: uppercase; letter-spacing: 0.5px; }
tr:last-child td { border-bottom: none; }
td.mono, .mono { font-family: var(--mono); }
td .old { color: var(--dim); }
td .new { color: #7ee787; font-weight: 600; }
td.gone { color: #f85149; }
.matrix td { font-family: var(--mono); font-size: 12.5px; }
.matrix td:first-child { font-family: inherit; }

footer {
  padding: 12px 20px;
  border-top: 1px solid var(--border);
  color: var(--dim);
  font-size: 12px;
}
.dim { color: var(--dim); }

.toast {
  position: fixed;
  bottom: 22px;
  left: 50%;
  transform: translateX(-50%);
  background: #238636;
  color: #fff;
  padding: 8px 18px;
  border-radius: 999px;
  font-size: 13px;
  opacity: 0;
  transition: opacity 0.25s;
  pointer-events: none;
}
.toast.show { opacity: 1; }

@media (max-width: 900px) {
  main { grid-template-columns: 1fr; }
}