:root {
  --bg: #0f1115;
  --bg-soft: #171a21;
  --panel: #1b1f29;
  --panel-2: #20252f;
  --border: #2b313d;
  --border-soft: #232834;
  --text: #e8ecf3;
  --text-dim: #9aa4b2;
  --text-faint: #6b7480;
  --accent: #5b9dff;
  --accent-soft: rgba(91, 157, 255, 0.12);
  --green: #4ec98f;
  --amber: #e7b552;
  --red: #f0776c;
  --code-bg: #11141b;
  --radius: 14px;
  --radius-sm: 9px;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--sans);
  background: radial-gradient(1200px 600px at 70% -10%, #1a2030 0%, var(--bg) 55%) fixed;
  color: var(--text);
  line-height: 1.6;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
}

.wrap { width: 100%; max-width: 1180px; margin: 0 auto; padding: 0 22px; }

/* Topbar */
.topbar {
  position: sticky; top: 0; z-index: 20;
  background: rgba(15, 17, 21, 0.82);
  backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid var(--border-soft);
}
.topbar-inner { display: flex; align-items: center; justify-content: space-between; height: 58px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 650; letter-spacing: .2px; }
.brand-mark { font-size: 20px; }
.brand-text { font-size: 15.5px; }
.topbar-link { color: var(--text-dim); text-decoration: none; font-size: 14px; padding: 6px 10px; border-radius: 8px; }
.topbar-link:hover { color: var(--text); background: var(--panel); }

/* Layout */
.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  gap: 22px;
  padding-top: 26px;
  padding-bottom: 30px;
  align-items: start;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.input-panel { padding: 24px; }
.output-panel { position: sticky; top: 78px; display: flex; flex-direction: column; max-height: calc(100vh - 100px); }

.panel-head h1 {
  margin: 0 0 10px;
  font-size: 23px;
  line-height: 1.32;
  letter-spacing: -.2px;
}
.lede { margin: 0 0 18px; color: var(--text-dim); font-size: 14px; }

/* Examples */
.examples { margin-bottom: 18px; }
.examples-label { display: block; font-size: 12.5px; color: var(--text-faint); margin-bottom: 8px; }
.example-btns { display: flex; flex-wrap: wrap; gap: 8px; }
.example-btn {
  font-family: var(--sans);
  font-size: 12.5px;
  color: var(--text-dim);
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 6px 13px;
  cursor: pointer;
  transition: all .15s ease;
}
.example-btn:hover { color: var(--text); border-color: var(--accent); background: var(--accent-soft); }

/* Form */
.form { display: flex; flex-direction: column; gap: 15px; }
.field { display: flex; flex-direction: column; gap: 7px; border: 0; padding: 0; margin: 0; min-width: 0; }
.field-label { font-size: 12.5px; color: var(--text-dim); font-weight: 550; }
.opt { color: var(--text-faint); font-weight: 400; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }

input[type="text"], select {
  font-family: var(--sans);
  font-size: 14px;
  color: var(--text);
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  width: 100%;
  transition: border-color .15s ease, box-shadow .15s ease;
}
input[type="text"]::placeholder { color: var(--text-faint); }
input[type="text"]:focus, select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
select { appearance: none; cursor: pointer; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%239aa4b2' d='M6 8L2 4h8z'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 12px center; padding-right: 32px; }

/* Capabilities grid */
.caps { gap: 9px; }
.caps-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.cap-item {
  display: flex; align-items: flex-start; gap: 9px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 11px;
  cursor: pointer;
  transition: border-color .15s ease, background .15s ease;
}
.cap-item:hover { border-color: var(--accent); }
.cap-item.on { border-color: var(--accent); background: var(--accent-soft); }
.cap-item input { margin: 2px 0 0; accent-color: var(--accent); width: 15px; height: 15px; flex: 0 0 auto; }
.cap-body { display: flex; flex-direction: column; gap: 1px; min-width: 0; }
.cap-name { font-size: 13px; font-weight: 550; }
.cap-hint { font-size: 11.5px; color: var(--text-faint); line-height: 1.4; }

/* Vars */
.vars { margin-top: 4px; border: 1px solid var(--border-soft); border-radius: var(--radius-sm); background: var(--bg-soft); }
.vars summary { cursor: pointer; padding: 11px 13px; font-size: 13px; color: var(--text-dim); list-style: none; user-select: none; }
.vars summary::-webkit-details-marker { display: none; }
.vars summary::before { content: "▸ "; color: var(--text-faint); }
.vars[open] summary::before { content: "▾ "; }
.vars-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 11px; padding: 4px 13px 14px; }

/* Output panel */
.output-toolbar {
  display: flex; align-items: flex-start; justify-content: space-between; gap: 14px;
  padding: 18px 20px;
  border-bottom: 1px solid var(--border);
}
.output-title h2 { margin: 0 0 4px; font-size: 17px; }
.rb-meta { margin: 0; font-size: 12px; color: var(--text-faint); display: flex; flex-wrap: wrap; gap: 6px; }
.rb-meta .tag { background: var(--panel-2); border: 1px solid var(--border); border-radius: 6px; padding: 2px 7px; }
.rb-meta .tag.crit-high { color: var(--red); border-color: rgba(240,119,108,.4); }
.rb-meta .tag.crit-medium { color: var(--amber); border-color: rgba(231,181,82,.35); }
.rb-meta .tag.crit-low { color: var(--green); border-color: rgba(78,201,143,.35); }

.output-actions { display: flex; gap: 8px; flex: 0 0 auto; }
.btn {
  font-family: var(--sans); font-size: 13px; font-weight: 550;
  color: var(--text); background: var(--panel-2);
  border: 1px solid var(--border); border-radius: 8px;
  padding: 8px 13px; cursor: pointer; white-space: nowrap;
  transition: all .15s ease;
}
.btn:hover { border-color: var(--accent); }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #0c1320; }
.btn-primary:hover { filter: brightness(1.08); }
.btn.copied { color: var(--green); border-color: var(--green); }

.output { padding: 6px 20px 22px; overflow-y: auto; flex: 1; }

/* Rendered runbook sections */
.rb-section { margin-top: 18px; }
.rb-section:first-child { margin-top: 8px; }
.rb-h {
  display: flex; align-items: center; gap: 8px;
  font-size: 13px; font-weight: 650; letter-spacing: .3px;
  color: var(--text); text-transform: uppercase;
  margin: 0 0 11px; padding-bottom: 7px;
  border-bottom: 1px solid var(--border-soft);
}
.rb-h .count { font-size: 11px; color: var(--text-faint); font-weight: 500; letter-spacing: 0; text-transform: none; }
.rb-h .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); flex: 0 0 auto; }

.summary-line { color: var(--text-dim); font-size: 13.5px; margin: 2px 0 0; }

/* check / list items */
.check { margin-bottom: 11px; }
.check-label { font-size: 12.5px; color: var(--text-dim); margin-bottom: 5px; }
.check-label .group { color: var(--text-faint); }
pre.cmd {
  margin: 0; font-family: var(--mono); font-size: 12.5px;
  background: var(--code-bg); border: 1px solid var(--border-soft);
  border-radius: 8px; padding: 9px 11px; overflow-x: auto;
  color: #cbd5e6; white-space: pre-wrap; word-break: break-word;
}

/* failure cards */
.fail {
  background: var(--bg-soft); border: 1px solid var(--border);
  border-left: 3px solid var(--amber);
  border-radius: 10px; padding: 13px 14px; margin-bottom: 11px;
}
.fail-symptom { font-size: 13.5px; font-weight: 600; margin: 0 0 8px; color: var(--text); }
.fail-row { font-size: 12.5px; color: var(--text-dim); margin: 5px 0; display: flex; gap: 7px; }
.fail-row .k { color: var(--text-faint); flex: 0 0 auto; min-width: 44px; }
.fail-row .k.fix { color: var(--green); }
.fail-row code { font-family: var(--mono); font-size: 12px; background: var(--code-bg); padding: 1px 6px; border-radius: 5px; color: #cbd5e6; word-break: break-all; }
.fail-group { font-size: 11px; color: var(--text-faint); float: right; }

/* ordered steps */
ol.steps { margin: 0; padding-left: 20px; }
ol.steps li { font-size: 13px; color: var(--text-dim); margin-bottom: 7px; }
ul.bullets { margin: 0; padding-left: 18px; list-style: none; }
ul.bullets li { font-size: 13px; color: var(--text-dim); margin-bottom: 7px; position: relative; padding-left: 2px; }
ul.bullets li::before { content: "›"; color: var(--accent); position: absolute; left: -14px; }
ul.bullets li.esc::before { content: "▸"; color: var(--amber); }

.cadence-box {
  background: var(--accent-soft); border: 1px solid rgba(91,157,255,.25);
  border-radius: 9px; padding: 11px 13px; font-size: 13px; color: var(--text);
}

/* How section */
.how { padding: 30px 22px 10px; max-width: 820px; }
.how h2 { font-size: 19px; margin: 0 0 12px; }
.how p { color: var(--text-dim); font-size: 14px; }
.how ul { padding-left: 20px; }
.how li { color: var(--text-dim); font-size: 14px; margin-bottom: 8px; }
.how strong { color: var(--text); }
.how-note { font-size: 13px; color: var(--text-faint); border-top: 1px solid var(--border-soft); padding-top: 14px; margin-top: 16px; }

/* Footer */
.footer { border-top: 1px solid var(--border-soft); margin-top: 26px; padding: 22px 0 34px; }
.footer .wrap { display: flex; flex-direction: column; gap: 5px; align-items: center; text-align: center; font-size: 12.5px; color: var(--text-dim); }
.footer-dim { color: var(--text-faint); }

/* Responsive */
@media (max-width: 880px) {
  .layout { grid-template-columns: 1fr; }
  .output-panel { position: static; max-height: none; }
  .output { max-height: none; }
  .panel-head h1 { font-size: 21px; }
}
@media (max-width: 520px) {
  .wrap { padding: 0 15px; }
  .input-panel { padding: 18px; }
  .field-row { grid-template-columns: 1fr; }
  .caps-grid { grid-template-columns: 1fr; }
  .vars-grid { grid-template-columns: 1fr; }
  .output-toolbar { flex-direction: column; }
  .output-actions { width: 100%; }
  .output-actions .btn { flex: 1; }
  .brand-text { font-size: 14px; }
}