/* rhcsa-lab — classic terminal theme (black bg, green user@host, blue path) */
:root {
  --ub-orange: #e95420;          /* site accent */
  --term-bg: #000000;            /* classic console black */
  --term-fg: #e5e5e5;
  --titlebar: #2b2b2b;
  --titlebar-fg: #d6d6d6;

  /* classic ANSI bright colors on black */
  --t-green: #4ce64c;
  --t-green-dim: #2aa22a;
  --t-blue: #6f9ff2;
  --t-red: #ff5c5c;
  --t-yellow: #f2e85c;
  --t-yellow-dim: #c4a000;
  --t-cyan: #4dd8d8;
  --t-magenta: #c586c0;
  --t-dim: #8f8f8f;

  /* sidebar / chrome — neutral dark */
  --side-bg: #151515;
  --side-panel: #212121;
  --side-border: #2d2d2d;
  --text: #e6e6e6;
  --text-dim: #9a9a9a;

  --mono: "Ubuntu Mono", "DejaVu Sans Mono", "SF Mono", Menlo, Consolas, monospace;
  --sans: "Ubuntu", -apple-system, "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: radial-gradient(ellipse at 30% 20%, #383838 0%, #1b1b1b 75%);
  background-attachment: fixed;
  color: var(--text);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.55;
}

.layout { display: flex; min-height: 100vh; }

/* =============== Sidebar =============== */
.sidebar {
  width: 300px;
  flex-shrink: 0;
  background: var(--side-bg);
  border-right: 1px solid var(--side-border);
  padding: 18px 12px 14px;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

.brand { display: flex; gap: 10px; align-items: center; padding: 0 8px 10px; }
.brand-hat { color: var(--ub-orange); font-size: 26px; line-height: 1; }
.brand h1 { margin: 0; font-size: 19px; letter-spacing: 0.5px; font-family: var(--mono); }
.brand-sub { margin: 0; color: var(--text-dim); font-size: 12px; }

.side-stats {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--text-dim);
  padding: 6px 10px 12px;
  border-bottom: 1px solid var(--side-border);
  margin-bottom: 10px;
  flex-shrink: 0;
}
.brand { flex-shrink: 0; }
.side-stats b { color: var(--t-green); }

.ver-select {
  display: flex;
  flex-shrink: 0;
  gap: 0;
  margin: 0 8px 12px;
  border: 1px solid var(--side-border);
  border-radius: 7px;
  overflow: hidden;
}
.ver-btn {
  flex: 1;
  background: none;
  border: none;
  color: var(--text-dim);
  font-family: var(--mono);
  font-size: 12.5px;
  padding: 6px 8px;
  cursor: pointer;
}
.ver-btn:hover { background: var(--side-panel); color: var(--text); }
.ver-btn.active { background: var(--ub-orange); color: #fff; font-weight: 700; }
.ver-btn + .ver-btn { border-left: 1px solid var(--side-border); }

#domain-nav { flex: 1; }

.nav-item {
  display: block;
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  color: var(--text-dim);
  padding: 8px 10px;
  border-radius: 7px;
  cursor: pointer;
  font-size: 13.5px;
  font-family: var(--sans);
  margin-bottom: 2px;
}
.nav-item:hover { background: var(--side-panel); color: var(--text); }
.nav-item.active { background: var(--side-panel); color: #fff; }
.nav-item.playbook-link { color: var(--ub-orange); font-weight: 600; }
.nav-item.playbook-link.active { color: #fff; }
.nav-item .nav-title { display: flex; justify-content: space-between; align-items: baseline; gap: 8px; }

/* domain groups */
.nav-domain { margin-bottom: 2px; }
.nav-dhead {
  display: flex;
  width: 100%;
  align-items: center;
  gap: 7px;
  text-align: left;
  background: none;
  border: none;
  color: var(--text-dim);
  padding: 8px 10px;
  border-radius: 7px;
  cursor: pointer;
  font-size: 13px;
  font-family: var(--sans);
}
.nav-dhead:hover { background: var(--side-panel); color: var(--text); }
.nav-dhead.open { color: var(--text); }
.nav-caret { font-size: 10px; width: 10px; flex-shrink: 0; transition: transform .12s; color: var(--ub-orange); }
.nav-dhead.open .nav-caret { transform: rotate(90deg); }
.nav-dname { flex: 1; }
.nav-count { font-family: var(--mono); font-size: 11px; color: var(--text-dim); }
.nav-count.done { color: var(--t-green); }
.nav-sheet {
  background: none; border: none; cursor: pointer;
  color: var(--text-dim); font-size: 12px; padding: 0 2px; border-radius: 4px;
}
.nav-sheet:hover { color: var(--ub-orange); }

.nav-exlist { margin: 0 0 4px 14px; border-left: 1px solid var(--side-border); }
.nav-ex {
  display: flex;
  width: 100%;
  align-items: center;
  gap: 8px;
  text-align: left;
  background: none;
  border: none;
  color: var(--text-dim);
  padding: 4px 8px 4px 10px;
  cursor: pointer;
  font-size: 12.5px;
  font-family: var(--mono);
  border-radius: 0 6px 6px 0;
}
.nav-ex:hover { background: var(--side-panel); color: var(--text); }
.nav-ex.active { background: var(--side-panel); color: #fff; box-shadow: inset 2px 0 0 var(--ub-orange); }
.nav-ex .nx-title { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.nav-ex .nx-vim { font-size: 9.5px; color: var(--t-yellow-dim); border: 1px solid var(--t-yellow-dim); border-radius: 3px; padding: 0 3px; }

.nx-pips { display: flex; gap: 3px; flex-shrink: 0; }
.nx-pip { width: 6px; height: 6px; border-radius: 50%; background: var(--side-border); }
.nx-pip.filled { background: var(--t-green); }
.nx-pip.due { background: var(--t-yellow-dim); }
.due-count { color: var(--t-yellow); }

/* node tag (full-simulation two-system tasks) */
.node-tag {
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--t-cyan);
  border: 1px solid var(--t-cyan);
  border-radius: 4px;
  padding: 0 5px;
  text-transform: none;
  letter-spacing: 0;
}

/* coverage map */
.cov-cat { margin: 20px 0 6px; font-size: 15px; color: var(--text); }
.cov-row {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 6px 12px;
  border-radius: 6px;
  margin-bottom: 3px;
  font-size: 13.5px;
  cursor: pointer;
  border: 1px solid transparent;
}
.cov-row:hover { border-color: var(--side-border); }
.cov-row .cov-ic { width: 16px; text-align: center; font-weight: 700; flex-shrink: 0; }
.cov-row .cov-t { flex: 1; color: var(--text-dim); }
.cov-row .cov-n { font-family: var(--mono); font-size: 11.5px; color: var(--text-dim); }
.cov-row.ok { background: rgba(76, 230, 76, 0.08); }
.cov-row.ok .cov-ic { color: var(--t-green); }
.cov-row.ok .cov-t { color: var(--text); }
.cov-row.due { background: rgba(196, 160, 0, 0.10); }
.cov-row.due .cov-ic { color: var(--t-yellow); }
.cov-row.part .cov-ic { color: var(--t-cyan); }
.cov-row.none .cov-ic { color: var(--text-dim); }

.sidebar-footer { padding-top: 12px; border-top: 1px solid var(--side-border); display: flex; flex-direction: column; gap: 6px; }

.btn {
  background: var(--side-panel);
  border: 1px solid var(--side-border);
  color: var(--text);
  border-radius: 7px;
  padding: 9px 16px;
  font-size: 13.5px;
  cursor: pointer;
  font-family: var(--sans);
  white-space: nowrap;
}
.btn:hover { border-color: var(--text-dim); }
.btn-primary { background: var(--ub-orange); border-color: var(--ub-orange); color: #fff; font-weight: 600; }
.btn-primary:hover { background: #c7431a; border-color: #c7431a; }
.btn-ghost { background: none; }
.btn-danger:hover { border-color: var(--t-red); color: var(--t-red); }
.btn-small { padding: 5px 11px; font-size: 12.5px; }
#btn-examwording.active-toggle { border-color: var(--t-yellow-dim); color: var(--t-yellow); }

/* =============== Main =============== */
.main { flex: 1; padding: 22px 26px; min-width: 0; }

/* =============== GNOME terminal window =============== */
.gnome-window {
  display: flex;
  flex-direction: column;
  height: calc(100vh - 44px);
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.55), 0 0 0 1px rgba(0, 0, 0, 0.4);
  position: sticky;
  top: 22px;
}
.titlebar {
  background: linear-gradient(#333, var(--titlebar));
  color: var(--titlebar-fg);
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 600;
  display: flex;
  align-items: center;
  padding: 7px 12px;
  gap: 8px;
  flex-shrink: 0;
  user-select: none;
}
.tb-title { flex: 1; text-align: center; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
.tb-icon { font-size: 13px; opacity: .7; }
.tb-btns { display: flex; gap: 8px; }
.tb-btn {
  width: 17px; height: 17px; border-radius: 50%;
  background: #4a4a4a; color: #ccc;
  font-size: 10px; line-height: 17px; text-align: center;
  font-family: var(--sans);
}
.tb-btn.close:hover { background: var(--ub-orange); color: #fff; }

.term-body {
  flex: 1;
  background: var(--term-bg);
  color: var(--term-fg);
  font-family: var(--mono);
  font-size: 14px;
  line-height: 1.45;
  overflow-y: auto;
  padding: 10px 14px 16px;
  cursor: text;
}
.term-body::selection, .term-body *::selection { background: rgba(160, 200, 255, 0.35); }

.scrollback { white-space: pre-wrap; word-break: break-word; }
.scrollback > div { min-height: 1.2em; }

/* prompt */
.ps1 { white-space: pre; }
.ps1 .u { color: var(--t-green); font-weight: 700; }
.ps1 .path { color: var(--t-blue); font-weight: 700; }
.prompt-line { display: flex; align-items: baseline; }
.term-input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--term-fg);
  font-family: var(--mono);
  font-size: 14px;
  padding: 0;
  margin: 0;
  caret-color: var(--term-fg);
  min-width: 40px;
}

/* terminal text colors */
.t-ok { color: var(--t-green); font-weight: 700; }
.t-err { color: var(--t-red); font-weight: 700; }
.t-warn { color: var(--t-yellow); }
.t-dim { color: var(--t-dim); }
.t-cmd { color: var(--term-fg); }
.t-cyan { color: var(--t-cyan); }
.t-out { color: #cfcfcf; }
.scrollback code {
  color: var(--t-cyan);
  background: rgba(52, 226, 226, 0.07);
  border-radius: 3px;
  padding: 0 3px;
  font-family: var(--mono);
}
.scrollback .param { color: var(--t-yellow); font-weight: 700; }

/* task box */
.task-box {
  border: 1px solid #4a4a4a;
  border-left: 3px solid var(--ub-orange);
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.035);
  margin: 8px 0;
  padding: 8px 12px;
}
.task-box-title {
  color: var(--ub-orange);
  font-weight: 700;
  font-size: 12px;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 4px;
  display: flex;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
}
.task-box-title .tb-meta { color: var(--t-dim); font-weight: 400; text-transform: none; letter-spacing: 0; }
.task-box-body b { color: var(--t-yellow); }

/* blocks inside scrollback */
.approaches { margin: 6px 0 2px; padding-left: 2px; }
.approaches .ap-title { color: var(--t-dim); font-size: 12px; text-transform: uppercase; letter-spacing: 1px; }
.approaches .variant { margin: 3px 0 6px; }
.approaches .variant code { color: var(--t-cyan); background: none; padding: 0; }
.approaches .v-note { color: var(--t-dim); font-size: 12.5px; }
.approaches .v-step-label { color: var(--t-magenta); font-size: 12.5px; margin-top: 6px; font-weight: 700; }
.explain-block {
  border-left: 2px solid var(--t-magenta);
  padding: 2px 10px;
  margin: 6px 0;
  color: #cfcfcf;
  font-family: var(--sans);
  font-size: 13.5px;
}
.explain-block strong, .explain-block b { color: var(--term-fg); }
.out-block { color: #cfcfcf; }
.out-block .t-prompt { color: var(--t-green); font-weight: 700; }
.sep-line { color: #3a3a3a; margin: 8px 0 2px; overflow: hidden; white-space: nowrap; }

/* function key bar (mc style) */
.fkey-bar {
  display: flex;
  background: #1a5f8a;
  flex-shrink: 0;
  font-family: var(--mono);
  font-size: 12.5px;
  overflow-x: auto;
}
.fkey {
  display: flex;
  align-items: center;
  border: none;
  background: none;
  cursor: pointer;
  padding: 5px 10px 5px 6px;
  color: #fff;
  font-family: var(--mono);
  font-size: 12.5px;
  white-space: nowrap;
}
.fkey:hover { background: #2679ab; }
.fkey .fk-num { color: #9adcff; margin-right: 4px; }
.fkey.fk-danger:hover { background: #8a1a1a; }

/* =============== vim sim inside the terminal =============== */
.vim-fill { display: flex; flex-direction: column; height: 100%; }
.vimsim {
  outline: none;
  display: flex;
  flex-direction: column;
  flex: 1;
  cursor: text;
  min-height: 0;
}
.vim-screen {
  margin: 0;
  padding: 2px 0;
  font-family: var(--mono);
  font-size: 14px;
  line-height: 1.45;
  color: var(--term-fg);
  flex: 1;
  overflow: auto;
  white-space: pre;
}
.vim-cursor { background: var(--term-fg); color: var(--term-bg); border-radius: 1px; }
.vimsim:not(:focus) .vim-cursor { background: transparent; color: inherit; box-shadow: inset 0 0 0 1px var(--term-fg); }
.vim-tilde { color: var(--t-blue); }
.vim-status {
  display: flex;
  justify-content: space-between;
  background: #cfcfcf;
  color: #000000;
  font-family: var(--mono);
  font-size: 13px;
  padding: 0 8px;
  font-weight: 700;
}
.vim-msg { font-family: var(--mono); font-size: 14px; padding: 1px 0 2px; min-height: 21px; color: var(--term-fg); }
.vim-msg b { color: var(--term-fg); font-weight: 700; }
.vim-keys {
  font-size: 11.5px;
  color: var(--t-dim);
  font-family: var(--mono);
  padding: 4px 0 0;
  border-top: 1px solid #3a3a3a;
}
.vim-keys b { color: var(--t-cyan); font-weight: 600; }

/* =============== Pages (playbook / mock / chains / sheet) =============== */
.page {
  background: var(--side-bg);
  border: 1px solid var(--side-border);
  border-radius: 10px;
  padding: 24px 28px;
  max-width: 900px;
}
.page-tag {
  font-family: var(--mono); font-size: 12px; color: var(--ub-orange);
  text-transform: uppercase; letter-spacing: 1.5px;
}
.page h2 { margin: 4px 0 8px; font-size: 24px; }
.page .blurb { color: var(--text-dim); max-width: 74ch; }

.playbook h3 { margin: 22px 0 8px; color: var(--text); }
.playbook h3:first-child { margin-top: 0; }
.playbook p, .playbook li { color: var(--text-dim); }
.playbook b { color: var(--text); }
.playbook code {
  font-family: var(--mono); font-size: 13px;
  background: var(--term-bg); padding: 1px 6px; border-radius: 4px; color: var(--t-cyan);
}
.playbook pre {
  background: var(--term-bg);
  border: 1px solid var(--side-border);
  border-radius: 8px;
  padding: 12px 14px;
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 1.6;
  color: #cfcfcf;
  overflow-x: auto;
}

/* mock */
.mock-bar {
  display: flex; align-items: center; gap: 12px;
  background: var(--side-bg); border: 1px solid var(--side-border);
  border-radius: 10px; padding: 9px 16px; margin-bottom: 14px;
}
.mock-progress { flex: 1; font-size: 14px; }
.mock-clock { font-family: var(--mono); font-size: 19px; font-weight: 700; color: var(--t-green); }
.mock-clock.danger { color: var(--t-red); }
.mock-controls { display: flex; gap: 14px; align-items: center; margin-top: 16px; flex-wrap: wrap; }
.mock-controls label { color: var(--text-dim); font-size: 13px; display: flex; gap: 8px; align-items: center; }
.mock-controls select {
  background: var(--term-bg); color: var(--text);
  border: 1px solid var(--side-border); border-radius: 6px; padding: 6px 10px;
  font-family: var(--sans);
}
.mock-last { color: var(--text-dim); font-family: var(--mono); font-size: 13px; }
.mock-pass { color: var(--t-green); }
.mock-fail { color: var(--t-red); }
.mock-list { margin: 14px 0 4px; }
.mock-row { padding: 6px 12px; border-radius: 6px; font-size: 13.5px; margin-bottom: 4px; }
.mock-row.ok { background: rgba(138, 226, 52, 0.10); }
.mock-row.miss { background: rgba(239, 41, 41, 0.12); }
.mock-row .v-note { color: var(--text-dim); font-size: 12px; }

/* chains */
.chain-card {
  background: var(--side-bg);
  border: 1px solid var(--side-border);
  border-radius: 10px;
  padding: 18px 22px;
  margin-bottom: 14px;
  max-width: 900px;
}
.chain-card h3 { margin: 0 0 6px; font-size: 16.5px; }
.chain-card .blurb { margin: 0 0 12px; color: var(--text-dim); font-size: 14px; }
.chain-card .pip-label { color: var(--text-dim); font-family: var(--mono); font-size: 12px; float: right; }

/* study sheet */
.sheet-note { color: var(--text-dim); font-size: 13px; margin: 0 0 14px; }
.sheet-row {
  padding: 10px 14px; border: 1px solid var(--side-border);
  border-radius: 8px; margin-bottom: 8px; background: var(--side-bg);
}
.sheet-title { font-weight: 600; font-size: 13.5px; margin-bottom: 5px; }
.sheet-row code {
  display: block; font-family: var(--mono); font-size: 12.5px;
  color: var(--t-cyan); background: var(--term-bg);
  padding: 3px 9px; border-radius: 5px; margin: 3px 0;
  overflow-x: auto; white-space: pre;
}
.sheet-hint { color: var(--text-dim); font-size: 12px; margin-top: 4px; font-family: var(--mono); }

@media (max-width: 900px) {
  .layout { flex-direction: column; }
  .sidebar { width: 100%; height: auto; position: static; }
  .main { padding: 14px 10px; }
  .gnome-window { height: 78vh; position: static; }
}

@media print {
  .sidebar, .fkey-bar, .mock-bar { display: none !important; }
  body { background: #fff; color: #000; }
  .main { max-width: none; padding: 10px; }
  .page { background: #fff; border-color: #ccc; }
  .page h2, .sheet-title { color: #000; }
  .page .blurb, .sheet-note { color: #444; }
  .sheet-row { break-inside: avoid; border-color: #ccc; background: #fff; }
  .sheet-row code { background: #f4f4f4; color: #111; }
  .sheet-hint { color: #666; }
}