/* ============================================================
   K8s + Jenkins Lab Learning Pack — shared styles
   Dark theme, Kubernetes blue accent
   ============================================================ */
:root {
  --bg: #0a0e1a;
  --bg2: #0f1526;
  --panel: #131b2e;
  --panel2: #182238;
  --border: #24304d;
  --text: #d6deef;
  --muted: #8b98b8;
  --accent: #4d8ef7;
  --accent2: #4dd0e1;
  --k8s: #326ce5;
  --good: #3fb950;
  --warn: #e3b341;
  --bad: #f85149;
  --purple: #bc8cff;
  --code-bg: #0d1320;
  --radius: 12px;
  --mono: 'Cascadia Code', 'Consolas', 'JetBrains Mono', monospace;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  line-height: 1.65;
  font-size: 16px;
}
::selection { background: rgba(77,142,247,.35); }

/* ---------- top navigation ---------- */
nav.topnav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(10,14,26,.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; gap: 4px;
  padding: 10px 18px;
  overflow-x: auto;
  white-space: nowrap;
}
nav.topnav .brand {
  font-weight: 800; color: #fff; text-decoration: none;
  margin-right: 14px; font-size: 15px; flex-shrink: 0;
  display: flex; align-items: center; gap: 8px;
}
nav.topnav .brand .helm-ico { animation: spin 14s linear infinite; display: inline-block; }
@keyframes spin { to { transform: rotate(360deg); } }
nav.topnav a.nl {
  color: var(--muted); text-decoration: none;
  font-size: 13px; padding: 5px 10px; border-radius: 8px;
  flex-shrink: 0; transition: all .18s;
}
nav.topnav a.nl:hover { color: #fff; background: var(--panel2); }
nav.topnav a.nl.active { color: #fff; background: var(--k8s); }
nav.topnav a.nl.visited-page::after { content: ' ✓'; color: var(--good); font-size: 11px; }
nav.topnav a.nl.active.visited-page::after { color: #cdeccd; }

/* ---------- layout ---------- */
.wrap { max-width: 1060px; margin: 0 auto; padding: 34px 24px 90px; }
header.hero { padding: 30px 0 8px; }
.kicker {
  display: inline-block; font-size: 12px; letter-spacing: 2.5px;
  text-transform: uppercase; color: var(--accent2); font-weight: 700;
  margin-bottom: 10px;
}
h1 { font-size: 34px; color: #fff; line-height: 1.2; margin-bottom: 12px; }
h1 .grad {
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.lede { color: var(--muted); font-size: 17px; max-width: 780px; }
h2 {
  font-size: 24px; color: #fff; margin: 46px 0 14px;
  padding-top: 10px; scroll-margin-top: 80px;
}
h2 .num {
  display: inline-flex; align-items: center; justify-content: center;
  width: 32px; height: 32px; border-radius: 9px; margin-right: 10px;
  background: linear-gradient(135deg, var(--k8s), #1a3f8f);
  color: #fff; font-size: 15px; vertical-align: -6px;
}
h3 { font-size: 18px; color: #e8eeff; margin: 26px 0 10px; }
p { margin: 10px 0; }
p.note-sm { color: var(--muted); font-size: 14px; }
ul, ol { margin: 10px 0 10px 24px; }
li { margin: 5px 0; }
strong { color: #fff; }
em { color: var(--accent2); font-style: normal; }
a { color: var(--accent); }
hr.sep { border: none; border-top: 1px solid var(--border); margin: 40px 0; }

/* ---------- cards / grids ---------- */
.card {
  background: var(--panel); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px 22px; margin: 16px 0;
}
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
@media (max-width: 820px) { .grid2, .grid3 { grid-template-columns: 1fr; } }
.card h3 { margin-top: 4px; }
.card.hoverable { transition: transform .18s, border-color .18s; }
.card.hoverable:hover { transform: translateY(-3px); border-color: var(--accent); }
a.cardlink { text-decoration: none; color: inherit; display: block; }

/* ---------- badges / pills ---------- */
.badge {
  display: inline-block; padding: 2px 10px; border-radius: 20px;
  font-size: 12px; font-weight: 700; letter-spacing: .4px;
}
.badge.blue { background: rgba(77,142,247,.15); color: var(--accent); border: 1px solid rgba(77,142,247,.4); }
.badge.green { background: rgba(63,185,80,.12); color: var(--good); border: 1px solid rgba(63,185,80,.4); }
.badge.amber { background: rgba(227,179,65,.12); color: var(--warn); border: 1px solid rgba(227,179,65,.4); }
.badge.red { background: rgba(248,81,73,.12); color: var(--bad); border: 1px solid rgba(248,81,73,.4); }
.badge.purple { background: rgba(188,140,255,.12); color: var(--purple); border: 1px solid rgba(188,140,255,.4); }
.badge.cyan { background: rgba(77,208,225,.12); color: var(--accent2); border: 1px solid rgba(77,208,225,.4); }

/* ---------- callouts ---------- */
.callout {
  border-radius: var(--radius); padding: 16px 18px 16px 52px;
  margin: 18px 0; position: relative; border: 1px solid;
}
.callout::before {
  position: absolute; left: 16px; top: 14px; font-size: 20px;
}
.callout.info { background: rgba(77,142,247,.08); border-color: rgba(77,142,247,.35); }
.callout.info::before { content: 'ℹ️'; }
.callout.tip { background: rgba(63,185,80,.07); border-color: rgba(63,185,80,.35); }
.callout.tip::before { content: '💡'; }
.callout.warn { background: rgba(227,179,65,.07); border-color: rgba(227,179,65,.35); }
.callout.warn::before { content: '⚠️'; }
.callout.danger { background: rgba(248,81,73,.07); border-color: rgba(248,81,73,.4); }
.callout.danger::before { content: '🚨'; }
.callout.lab { background: rgba(188,140,255,.07); border-color: rgba(188,140,255,.35); }
.callout.lab::before { content: '🔬'; }
.callout .ct { font-weight: 700; color: #fff; display: block; margin-bottom: 4px; }

/* ---------- code blocks ---------- */
.code {
  background: var(--code-bg); border: 1px solid var(--border);
  border-radius: var(--radius); margin: 16px 0; overflow: hidden;
}
.code .code-head {
  display: flex; justify-content: space-between; align-items: center;
  padding: 8px 14px; background: var(--panel2);
  border-bottom: 1px solid var(--border);
  font-size: 12.5px; color: var(--muted); font-family: var(--mono);
}
.code .copybtn {
  background: transparent; color: var(--muted); border: 1px solid var(--border);
  border-radius: 6px; padding: 3px 12px; font-size: 12px; cursor: pointer;
  transition: all .15s; font-family: inherit;
}
.code .copybtn:hover { color: #fff; border-color: var(--accent); }
.code .copybtn.copied { color: var(--good); border-color: var(--good); }
.code pre {
  padding: 14px 16px; overflow-x: auto;
  font-family: var(--mono); font-size: 13.5px; line-height: 1.55;
  color: #c9d6f0;
}
.code pre .c { color: #6b7a99; }        /* comment */
.code pre .p { color: var(--accent2); font-weight: 700; }  /* prompt $ */
.code pre .g { color: var(--good); }    /* good output */
.code pre .r { color: var(--bad); }     /* bad / error */
.code pre .y { color: var(--warn); }    /* highlight */
.code pre .b { color: var(--accent); }  /* keyword */
.code pre .m { color: var(--purple); }  /* value */
.code.term pre { background: #080c16; }

/* ---------- tables ---------- */
table.tbl {
  width: 100%; border-collapse: collapse; margin: 16px 0;
  font-size: 14.5px; background: var(--panel); border-radius: var(--radius);
  overflow: hidden;
}
table.tbl th {
  background: var(--panel2); color: #fff; text-align: left;
  padding: 10px 14px; font-size: 13px; letter-spacing: .5px;
  border-bottom: 2px solid var(--border);
}
table.tbl td { padding: 9px 14px; border-bottom: 1px solid var(--border); vertical-align: top; }
table.tbl tr:last-child td { border-bottom: none; }
table.tbl code, p code, li code, td code {
  background: rgba(77,142,247,.12); color: #9fc3ff;
  padding: 1px 6px; border-radius: 5px; font-family: var(--mono); font-size: .88em;
}

/* ---------- accordions ---------- */
details.acc {
  background: var(--panel); border: 1px solid var(--border);
  border-radius: var(--radius); margin: 12px 0; overflow: hidden;
}
details.acc summary {
  cursor: pointer; padding: 15px 20px; font-weight: 700; color: #fff;
  list-style: none; display: flex; align-items: center; gap: 10px;
  transition: background .15s; user-select: none;
}
details.acc summary::-webkit-details-marker { display: none; }
details.acc summary::before {
  content: '▸'; color: var(--accent); transition: transform .2s; font-size: 15px;
}
details.acc[open] summary::before { transform: rotate(90deg); }
details.acc summary:hover { background: var(--panel2); }
details.acc .acc-body { padding: 4px 22px 18px; border-top: 1px solid var(--border); }

/* ---------- comparison columns ---------- */
.vs-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin: 20px 0; }
@media (max-width: 820px) { .vs-grid { grid-template-columns: 1fr; } }
.vs-col { border-radius: var(--radius); border: 1px solid var(--border); overflow: hidden; }
.vs-col .vs-head { padding: 13px 18px; font-weight: 800; color: #fff; font-size: 15px; }
.vs-col.helm .vs-head { background: linear-gradient(90deg, rgba(50,108,229,.35), transparent); border-bottom: 2px solid var(--k8s); }
.vs-col.raw .vs-head { background: linear-gradient(90deg, rgba(77,208,225,.25), transparent); border-bottom: 2px solid var(--accent2); }
.vs-col .vs-body { padding: 14px 18px; background: var(--panel); }

/* ---------- timeline ---------- */
.timeline { position: relative; margin: 24px 0 24px 10px; padding-left: 30px; }
.timeline::before {
  content: ''; position: absolute; left: 0; top: 6px; bottom: 6px;
  width: 3px; background: linear-gradient(var(--accent), var(--accent2));
  border-radius: 2px;
}
.tl-item { position: relative; margin-bottom: 22px; }
.tl-item::before {
  content: ''; position: absolute; left: -36px; top: 5px;
  width: 13px; height: 13px; border-radius: 50%;
  background: var(--bg); border: 3px solid var(--accent);
}
.tl-item.bad::before { border-color: var(--bad); }
.tl-item.good::before { border-color: var(--good); }
.tl-item.warn::before { border-color: var(--warn); }
.tl-item .tl-t { font-weight: 700; color: #fff; }

/* ---------- quiz ---------- */
.quiz {
  background: linear-gradient(160deg, var(--panel), var(--bg2));
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 22px 24px; margin: 24px 0;
}
.quiz .q-head { display: flex; align-items: center; gap: 10px; margin-bottom: 6px; }
.quiz .q-head .q-ico { font-size: 22px; }
.quiz .q-head h3 { margin: 0; }
.quiz .q-item { margin: 18px 0; padding-top: 14px; border-top: 1px dashed var(--border); }
.quiz .q-text { font-weight: 700; color: #fff; margin-bottom: 10px; }
.quiz label.q-opt {
  display: flex; gap: 10px; align-items: flex-start;
  padding: 9px 13px; margin: 6px 0; border-radius: 9px; cursor: pointer;
  border: 1px solid var(--border); background: var(--bg2);
  transition: border-color .15s; font-size: 15px;
}
.quiz label.q-opt:hover { border-color: var(--accent); }
.quiz label.q-opt input { margin-top: 4px; accent-color: var(--accent); }
.quiz label.q-opt.correct { border-color: var(--good); background: rgba(63,185,80,.1); }
.quiz label.q-opt.wrong { border-color: var(--bad); background: rgba(248,81,73,.08); }
.quiz .q-expl {
  display: none; margin-top: 10px; padding: 12px 14px;
  border-left: 3px solid var(--accent2); background: rgba(77,208,225,.06);
  border-radius: 0 9px 9px 0; font-size: 14.5px; color: var(--muted);
}
.quiz .q-expl.show { display: block; animation: fadeUp .3s ease; }
.quiz .q-check {
  margin-top: 16px; background: var(--k8s); color: #fff; border: none;
  padding: 10px 26px; border-radius: 9px; font-weight: 700; font-size: 15px;
  cursor: pointer; transition: filter .15s;
}
.quiz .q-check:hover { filter: brightness(1.15); }
.quiz .q-score { margin-top: 12px; font-weight: 800; font-size: 16px; }
.quiz .q-score.pass { color: var(--good); }
.quiz .q-score.fail { color: var(--warn); }

/* ---------- diagrams ---------- */
.diagram {
  background: radial-gradient(ellipse at 50% 0%, #101a33 0%, var(--bg2) 70%);
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 14px; margin: 20px 0; position: relative; overflow: hidden;
}
.diagram svg { width: 100%; height: auto; display: block; }
.diagram .dg-controls { display: flex; gap: 10px; margin: 6px 6px 2px; align-items: center; }
.diagram .replaybtn {
  background: var(--panel2); color: var(--text); border: 1px solid var(--border);
  border-radius: 8px; padding: 6px 16px; font-size: 13px; font-weight: 700;
  cursor: pointer; transition: all .15s;
}
.diagram .replaybtn:hover { border-color: var(--accent); color: #fff; }
.diagram .dg-cap { font-size: 13px; color: var(--muted); }

/* svg text defaults */
svg text { font-family: 'Segoe UI', system-ui, sans-serif; }
svg .mono { font-family: var(--mono); }

/* ---------- svg animations ---------- */
@keyframes fadeUp { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
@keyframes dashflow { to { stroke-dashoffset: -28; } }
.flowline { stroke-dasharray: 8 6; animation: dashflow 1s linear infinite; }
@keyframes pulse { 0%,100% { opacity: .55; } 50% { opacity: 1; } }
.pulse { animation: pulse 2s ease-in-out infinite; }
@keyframes popIn { from { opacity: 0; transform: scale(.85); } to { opacity: 1; transform: scale(1); } }
.stage-pop { opacity: 0; animation: popIn .5s ease forwards; }
@keyframes blinkbad { 0%,100% { opacity: 1; } 50% { opacity: .35; } }
.blinkbad { animation: blinkbad 1.1s ease-in-out infinite; }

/* ---------- footer nav ---------- */
.pagenav { display: flex; justify-content: space-between; margin-top: 60px; gap: 14px; }
.pagenav a {
  flex: 1; text-decoration: none; border: 1px solid var(--border);
  border-radius: var(--radius); padding: 14px 18px; color: var(--text);
  background: var(--panel); transition: border-color .15s, transform .15s;
}
.pagenav a:hover { border-color: var(--accent); transform: translateY(-2px); }
.pagenav a .pn-dir { font-size: 12px; color: var(--muted); display: block; }
.pagenav a .pn-t { font-weight: 700; color: #fff; }
.pagenav a.next { text-align: right; }

/* ---------- misc ---------- */
.kbd {
  font-family: var(--mono); background: var(--panel2); border: 1px solid var(--border);
  border-bottom-width: 3px; border-radius: 6px; padding: 1px 7px; font-size: .85em;
}
.center { text-align: center; }
.mt0 { margin-top: 0; }
.checklist { list-style: none; margin-left: 4px; }
.checklist li { padding-left: 30px; position: relative; }
.checklist li::before { content: '✅'; position: absolute; left: 0; }
.checklist.todo li::before { content: '☐'; color: var(--accent); font-size: 19px; top: -2px; }
.progressbar { height: 8px; background: var(--panel2); border-radius: 6px; overflow: hidden; margin: 8px 0 4px; }
.progressbar > div { height: 100%; background: linear-gradient(90deg, var(--k8s), var(--accent2)); border-radius: 6px; transition: width .5s ease; }