:root {
  --bg: #0a0f0d;
  --bg-raised: #101815;
  --bg-sunken: #060908;
  --bg-input: #0c1311;
  --border: #1e2b26;
  --border-soft: #16211c;
  --fg: #e7f3ee;
  --fg-dim: #93aca2;
  --fg-dimmer: #62786f;
  --mono: "SF Mono", "Menlo", "Monaco", "Cascadia Code", "Consolas", "Liberation Mono", monospace;
  --ui: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;

  --accent: #5eead4;
  --accent-fg: #052e28;
  --amber: #f2b84b;
  --red: #f87171;
  --lime: #a3e635;
  --cyan: #67e8f9;
  --violet: #c4b5fd;
  --pink: #f472b6;
  --orange: #fb923c;
  --blue: #7dd3fc;
}

* , *::before, *::after { box-sizing: border-box; }

html, body { margin: 0; min-height: 100%; background: var(--bg); color: var(--fg); }

body {
  font-family: var(--ui);
  font-size: 14px;
  line-height: 1.55;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

code {
  font-family: var(--mono);
  background: var(--bg-sunken);
  border: 1px solid var(--border-soft);
  border-radius: 4px;
  padding: 0 5px;
  font-size: 0.92em;
}

button { font-family: inherit; color: inherit; cursor: pointer; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 3px; }

/* ---- topbar ---- */
.topbar {
  border-bottom: 1px solid var(--border);
  background: var(--bg-raised);
  padding: 18px 24px;
  flex-shrink: 0;
}
.brand {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: -0.02em;
  color: var(--accent);
}
.brand::before { content: '$ '; color: var(--fg-dimmer); }
.tag { color: var(--fg-dim); font-size: 13px; margin-top: 4px; max-width: 68ch; }

/* ---- layout ---- */
.layout { max-width: 1180px; margin: 0 auto; padding: 22px 24px 48px; width: 100%; flex: 1; }

.panel-head { display: flex; align-items: baseline; gap: 10px; margin: 22px 0 8px; }
.panel-head h2 {
  font-size: 12px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--fg-dim);
  margin: 0; font-weight: 700;
}
.panel-head .hint { font-size: 12px; color: var(--fg-dimmer); }
.panel-head:first-child { margin-top: 0; }

/* ---- input bar ---- */
.input-bar { }
.prompt-row {
  display: flex; align-items: flex-start; gap: 10px;
  background: var(--bg-input); border: 1px solid var(--border); border-radius: 10px;
  padding: 12px 14px; transition: border-color 0.15s ease;
}
.prompt-row:focus-within { border-color: var(--accent); }
.prompt-glyph { font-family: var(--mono); color: var(--accent); font-weight: 700; padding-top: 2px; user-select: none; }
.cmd-input {
  flex: 1; background: transparent; border: none; outline: none; resize: none;
  color: var(--fg); font-family: var(--mono); font-size: 15px; line-height: 1.5;
  min-height: 24px; max-height: 220px; padding: 0;
}
.cmd-input::placeholder { color: var(--fg-dimmer); }

.examples-row { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.example-btn {
  background: var(--bg-raised); border: 1px solid var(--border-soft); color: var(--fg-dim);
  font-size: 12px; padding: 5px 10px; border-radius: 999px; transition: all 0.12s ease;
}
.example-btn:hover { border-color: var(--accent); color: var(--fg); background: var(--bg-sunken); }

/* ---- rendered line ---- */
.rendered-line-wrap { }
.rendered-line {
  background: var(--bg-sunken); border: 1px solid var(--border); border-radius: 10px;
  padding: 16px 18px; font-family: var(--mono); font-size: 15px; line-height: 2;
  white-space: pre-wrap; word-break: break-word;
}
.empty-note { color: var(--fg-dimmer); font-style: italic; font-size: 13px; }

.tok { border-radius: 4px; padding: 1px 1px; cursor: pointer; transition: background 0.1s ease; }
.tok:hover { background: rgba(94, 234, 212, 0.14); }
.tok-selected, .tok-selected:hover { background: var(--accent); color: var(--accent-fg); box-shadow: 0 0 0 1px var(--accent); }

.tok.lit { color: var(--fg); }
.tok.lit.glob { color: var(--amber); text-decoration: underline dotted; text-underline-offset: 3px; }
.tok.sq { color: var(--lime); }
.tok.dq { color: var(--cyan); }
.tok.var { color: var(--violet); font-weight: 600; }
.tok.cmdsub { color: var(--amber); font-weight: 600; }
.tok.arith { color: var(--pink); font-weight: 600; }
.tok.procsub { color: var(--orange); font-weight: 600; }
.tok.tilde { color: var(--blue); }
.tok.comment { color: var(--fg-dimmer); font-style: italic; }

.tok.op { color: var(--fg-dim); font-weight: 700; }
.tok.op-pipe { color: var(--accent); }
.tok.op-and-list, .tok.op-or-list, .tok.op-sequence, .tok.op-background { color: var(--blue); }
.tok.op-redirect, .tok.op-subshell { color: var(--red); }

/* first word of each command gets a command-role look, applied via role class added at the word level */
.rendered-line .tok.lit:first-child { }

/* ---- two-column area ---- */
.columns { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 26px; margin-top: 4px; }
.columns > section { min-width: 0; }
@media (max-width: 860px) { .columns { grid-template-columns: 1fr; } }

/* ---- pipeline diagram ---- */
.pipeline-diagram {
  background: var(--bg-raised); border: 1px solid var(--border); border-radius: 10px; padding: 16px;
  overflow-x: auto;
}
.diagram-list { display: flex; flex-direction: column; gap: 10px; }
.diagram-list.nested { padding: 4px 0; }
.diagram-item { }
.connector { display: flex; align-items: center; gap: 8px; padding-left: 4px; font-size: 12px; }
.connector .tok { padding: 2px 8px; }

.pipeline-row { display: flex; align-items: stretch; gap: 0; flex-wrap: nowrap; width: max-content; }
.stage-block { display: flex; align-items: center; }
.assign-row { display: none; }
.stage-block .assign-row { position: relative; }
.stage-box {
  background: var(--bg-sunken); border: 1px solid var(--border-soft); border-radius: 8px;
  padding: 10px 12px; min-width: 108px; cursor: pointer; transition: border-color 0.12s ease, transform 0.08s ease;
}
.stage-box:hover { border-color: var(--accent); }
.stage-box.tok-selected { background: var(--accent); border-color: var(--accent); }
.stage-box.tok-selected .stage-name, .stage-box.tok-selected .stage-summary { color: var(--accent-fg); }
.stage-name { font-family: var(--mono); font-weight: 700; color: var(--accent); font-size: 14px; }
.stage-summary { font-size: 11.5px; color: var(--fg-dim); margin-top: 3px; max-width: 20ch; }
.pipe-arrow {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  font-family: var(--mono); color: var(--accent); font-weight: 700; padding: 0 10px; cursor: pointer;
  border-radius: 6px;
}
.pipe-arrow:hover { background: rgba(94, 234, 212, 0.12); }
.pipe-caption { font-size: 9px; color: var(--fg-dimmer); font-weight: 400; white-space: nowrap; }

.redirect-branches { display: flex; flex-direction: column; gap: 4px; margin-left: 8px; justify-content: center; }
.redirect-chip {
  font-family: var(--mono); font-size: 11px; color: var(--red); background: var(--bg-raised);
  border: 1px solid var(--border-soft); border-radius: 6px; padding: 3px 8px; cursor: pointer; white-space: nowrap;
}
.redirect-chip:hover { border-color: var(--red); }
.redirect-chip.tok-selected { background: var(--red); color: #2a0a0a; }
.redirect-target { color: var(--fg); }
.redirect-chip.tok-selected .redirect-target { color: #2a0a0a; }

.assign-row { display: flex; gap: 6px; margin-bottom: 6px; flex-wrap: wrap; }
.assign-badge {
  font-family: var(--mono); font-size: 11px; color: var(--cyan); background: var(--bg-raised);
  border: 1px solid var(--border-soft); border-radius: 6px; padding: 2px 7px;
}
.assign-badge.tok-selected { background: var(--cyan); color: #04262b; }
.diagram-item:has(.assign-row) { }

.subshell-box { border: 1px dashed var(--border); border-radius: 10px; padding: 10px 12px; background: var(--bg-sunken); }
.subshell-tag { font-size: 10px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--fg-dimmer); margin-bottom: 6px; }

/* ---- flags glossary ---- */
.flags-glossary { background: var(--bg-raised); border: 1px solid var(--border); border-radius: 10px; padding: 4px 16px; }
.glossary { margin: 0; }
.glossary-row { display: flex; justify-content: space-between; gap: 14px; padding: 10px 0; border-bottom: 1px solid var(--border-soft); }
.glossary-row:last-child { border-bottom: none; }
.glossary-row dt { font-family: var(--mono); font-size: 12.5px; white-space: nowrap; color: var(--fg); flex-shrink: 0; }
.glossary-row .gloss-flag { color: var(--blue); font-weight: 700; }
.glossary-row dd { margin: 0; font-size: 12.5px; color: var(--fg-dim); text-align: right; }

/* ---- detail panel ---- */
.detail-panel {
  background: var(--bg-raised); border: 1px solid var(--border); border-radius: 10px; padding: 16px;
  min-height: 96px;
}
.detail-empty { color: var(--fg-dimmer); font-style: italic; margin: 0; font-size: 13px; }
.detail-kind { font-size: 11px; text-transform: uppercase; letter-spacing: 0.07em; color: var(--accent); font-weight: 700; }
.detail-title { font-family: var(--mono); font-size: 17px; margin-top: 4px; word-break: break-word; }
.detail-body { margin-top: 10px; font-size: 13.5px; color: var(--fg-dim); line-height: 1.6; }
.detail-body code { color: var(--fg); }
.detail-body ul { margin: 6px 0 0; padding-left: 18px; }
.detail-body li { margin: 3px 0; }
.flag-sub-list li code { color: var(--blue); }

.nested-breakdown { margin-top: 10px; border-top: 1px dashed var(--border-soft); padding-top: 8px; }
.nested-label { font-size: 10px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--fg-dimmer); margin-bottom: 4px; }
.nested-line { font-family: var(--mono); font-size: 12.5px; background: var(--bg-sunken); border-radius: 6px; padding: 8px 10px; overflow-x: auto; white-space: pre; }
.mini-op { color: var(--fg-dim); }
.mini-flag { color: var(--blue); }
.mini-var { color: var(--violet); }
.mini-cmdsub { color: var(--amber); }
.mini-arith { color: var(--pink); }
.mini-procsub { color: var(--orange); }
.mini-lit { color: var(--fg); }

/* ---- gotchas ---- */
.gotchas-list { display: flex; flex-direction: column; gap: 8px; }
.gotcha { border-radius: 8px; padding: 10px 12px; font-size: 12.5px; border: 1px solid var(--border-soft); background: var(--bg-raised); border-left: 3px solid var(--fg-dimmer); }
.gotcha-warn { border-left-color: var(--amber); }
.gotcha-info { border-left-color: var(--accent); }
.gotcha-title { font-weight: 700; color: var(--fg); }
.gotcha-body { color: var(--fg-dim); margin-top: 4px; line-height: 1.55; }
.gotcha-body code { color: var(--fg); }

/* ---- footer ---- */
.footer { text-align: center; padding: 22px; color: var(--fg-dimmer); font-size: 12px; border-top: 1px solid var(--border); }
.footer a { color: var(--fg-dim); text-decoration: none; }
.footer a:hover { color: var(--accent); text-decoration: underline; }

@media (max-width: 560px) {
  .topbar { padding: 14px 16px; }
  .layout { padding: 16px 14px 36px; }
  .rendered-line { font-size: 13.5px; padding: 12px; }
  .stage-summary { display: none; }
}