/* Containerization and AKS Workshop — shared theme
  Introduction to "Replatforming a Real-Time Messaging System to AKS" (Skybridge -> AKS)
   Self-contained, no external dependencies. Dark default with a light toggle. */

:root {
  --bg: #0b0f17;
  --bg-elev: #121826;
  --bg-elev-2: #182034;
  --border: #263149;
  --border-soft: #1c2536;
  --text: #e6ecf5;
  --text-dim: #9fb0c9;
  --text-faint: #6b7a95;
  --accent: #4aa8ff;
  --accent-2: #7c5cff;
  --accent-soft: rgba(74, 168, 255, 0.12);
  --good: #34d399;
  --good-soft: rgba(52, 211, 153, 0.12);
  --warn: #fbbf24;
  --warn-soft: rgba(251, 191, 36, 0.12);
  --bad: #f87171;
  --bad-soft: rgba(248, 113, 113, 0.12);
  --accent-border: rgba(74, 168, 255, 0.35);
  --good-border: rgba(52, 211, 153, 0.32);
  --code-bg: #0a0e16;
  --radius: 14px;
  --radius-sm: 9px;
  --shadow: 0 10px 40px rgba(0, 0, 0, 0.35);
  --maxw: 1120px;
  --mono: "SFMono-Regular", "JetBrains Mono", "Cascadia Code", Consolas, "Liberation Mono", Menlo, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

html[data-theme="light"] {
  --bg: #f6f8fc;
  --bg-elev: #ffffff;
  --bg-elev-2: #eef2f9;
  --border: #d6deea;
  --border-soft: #e6ecf5;
  --text: #16202e;
  --text-dim: #4a5a72;
  --text-faint: #7a8aa3;
  --accent: #1668d6;
  --accent-2: #6a3fe0;
  --accent-soft: rgba(22, 104, 214, 0.10);
  --good: #0f9d63;
  --good-soft: rgba(15, 157, 99, 0.10);
  --warn: #b7791f;
  --warn-soft: rgba(183, 121, 31, 0.12);
  --bad: #d64545;
  --bad-soft: rgba(214, 69, 69, 0.10);
  --accent-border: rgba(22, 104, 214, 0.34);
  --good-border: rgba(15, 157, 99, 0.30);
  --code-bg: #0d1524;
  --shadow: 0 10px 30px rgba(23, 42, 74, 0.10);
}

* { box-sizing: border-box; }

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}

html { overflow-x: hidden; scroll-behavior: smooth; scroll-padding-top: 84px; }

body {
  margin: 0;
  overflow-x: hidden;
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 22px; }

/* ---------- Skip link ---------- */
.skip {
  position: absolute; left: -999px; top: 0; z-index: 200;
  background: var(--accent); color: #fff; padding: 10px 16px; border-radius: 0 0 8px 0;
}
.skip:focus { left: 0; }

/* ---------- Top nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-soft);
}
.nav-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 12px 22px;
  display: flex; align-items: center; gap: 18px; position: relative;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; letter-spacing: -0.01em; }
.brand-logo { width: 32px; height: 32px; flex: 0 0 auto; }
.brand small { color: var(--text-faint); font-weight: 500; font-size: 12px; }
.nav-links {
  position: fixed; z-index: 120; top: 0; right: 0; width: min(360px, 88vw); height: 100dvh;
  display: flex; flex-direction: column; gap: 4px; padding: 82px 22px 24px;
  background: var(--bg-elev); border-left: 1px solid var(--border); box-shadow: var(--shadow);
  overflow-y: auto; transform: translateX(105%); visibility: hidden;
  transition: transform 0.24s ease, visibility 0.24s;
}
.nav-links.open { transform: translateX(0); visibility: visible; }
.drawer-heading {
  color: var(--text-faint); font-size: 11px; font-weight: 800; letter-spacing: 0.1em;
  text-transform: uppercase; padding: 0 12px 8px; border-bottom: 1px solid var(--border-soft); margin-bottom: 6px;
}
.nav-links a {
  display: block; color: var(--text-dim); padding: 10px 12px; border-radius: 8px; font-size: 14px; font-weight: 500;
}
.nav-links a:hover { background: var(--bg-elev-2); color: var(--text); text-decoration: none; }
.nav-links a.cta {
  background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #fff;
}
.theme-btn {
  background: var(--bg-elev-2); border: 1px solid var(--border); color: var(--text);
  width: 34px; height: 34px; border-radius: 9px; cursor: pointer; font-size: 15px;
  display: inline-flex; align-items: center; justify-content: center;
}
.theme-btn:hover { border-color: var(--accent); }

.nav-toggle {
  display: inline-flex; position: relative; z-index: 130; margin-left: auto; width: 38px; height: 34px; padding: 0;
  flex-direction: column; align-items: center; justify-content: center; gap: 4px;
  background: var(--bg-elev-2); border: 1px solid var(--border); border-radius: 9px; cursor: pointer;
}
.nav-toggle:hover { border-color: var(--accent); }
.nav-toggle span {
  display: block; width: 17px; height: 2px; border-radius: 2px; background: var(--text);
  transition: transform 0.2s ease, opacity 0.2s ease;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }
.nav-backdrop {
  position: fixed; z-index: 90; inset: 0; background: rgba(0, 0, 0, 0.55);
  opacity: 0; visibility: hidden; transition: opacity 0.24s ease, visibility 0.24s;
}
.drawer-open { overflow: hidden; }
.drawer-open .nav-backdrop { opacity: 1; visibility: visible; }

/* ---------- Hero ---------- */
.hero { padding: 72px 0 40px; position: relative; overflow: hidden; }
.hero::before {
  content: ""; position: absolute; inset: 0; z-index: -1;
  background:
    radial-gradient(60% 60% at 15% 0%, rgba(124, 92, 255, 0.14), transparent 60%),
    radial-gradient(50% 50% at 90% 10%, rgba(74, 168, 255, 0.12), transparent 60%);
}
.eyebrow {
  display: inline-block; font-size: 12px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--text-dim); font-weight: 700; padding: 6px 12px; border: 1px solid var(--border);
  border-radius: 999px; background: var(--bg-elev); margin-bottom: 20px;
}
.hero h1 {
  font-size: clamp(32px, 5.4vw, 56px); line-height: 1.05; letter-spacing: -0.025em;
  margin: 0 0 18px; font-weight: 800;
  background: linear-gradient(180deg, var(--text), color-mix(in srgb, var(--text) 62%, var(--accent)));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.hero p.lede { font-size: clamp(16px, 2.1vw, 20px); color: var(--text-dim); max-width: 780px; margin: 0 0 28px; }
.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px; padding: 12px 20px; border-radius: 11px;
  font-weight: 600; font-size: 15px; cursor: pointer; border: 1px solid transparent;
}
.btn-primary { background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #fff; }
.btn-primary:hover { text-decoration: none; filter: brightness(1.06); }
.btn-ghost { background: var(--bg-elev); border-color: var(--border); color: var(--text); }
.btn-ghost:hover { text-decoration: none; border-color: var(--accent); }

.stat-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-top: 44px; }
.stat { background: var(--bg-elev); border: 1px solid var(--border-soft); border-radius: var(--radius); padding: 18px; }
.stat b { display: block; font-size: 24px; font-weight: 800; letter-spacing: -0.02em; }
.stat span { color: var(--text-faint); font-size: 13px; }

/* ---------- Sections ---------- */
section { padding: 52px 0; border-top: 1px solid var(--border-soft); }
.kicker { color: var(--accent); font-weight: 700; font-size: 13px; letter-spacing: 0.1em; text-transform: uppercase; }
h2.sec { font-size: clamp(24px, 3.4vw, 34px); letter-spacing: -0.02em; margin: 8px 0 10px; font-weight: 800; }
.sec-lede { color: var(--text-dim); max-width: 760px; margin: 0 0 30px; font-size: 16px; }

/* ---------- Cards ---------- */
.grid { display: grid; gap: 16px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.card {
  background: var(--bg-elev); border: 1px solid var(--border-soft); border-radius: var(--radius);
  padding: 22px; position: relative;
}
.card:hover { border-color: var(--border); }
.card h3 { margin: 0 0 8px; font-size: 18px; letter-spacing: -0.01em; }
.card p { margin: 0; color: var(--text-dim); font-size: 14.5px; }
.card .idx { color: var(--text-faint); font-size: 12px; font-weight: 700; letter-spacing: 0.1em; }
.companion-link { display: inline-flex; margin-top: 18px; font-size: 13px; font-weight: 700; }
.companion-link.standalone { margin-top: 14px; }
.mode-card { display: flex; flex-direction: column; align-items: flex-start; min-height: 220px; }
.mode-card h3 { margin-top: 8px; }
.mode-card p { flex: 1; }
.mode-card .btn { margin-top: 22px; }
.tag {
  display: inline-block; font-size: 11px; font-weight: 600; color: var(--text-dim);
  background: var(--bg-elev-2); border: 1px solid var(--border-soft);
  padding: 3px 9px; border-radius: 999px; margin: 8px 6px 0 0;
}
.tag.accent { color: var(--accent); border-color: var(--accent-border); background: var(--accent-soft); }

/* ---------- Two-column compare ---------- */
.compare { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.compare .col { background: var(--bg-elev); border: 1px solid var(--border-soft); border-radius: var(--radius); padding: 22px; }
.compare .col.before { border-top: 3px solid var(--bad); }
.compare .col.after { border-top: 3px solid var(--good); }
.compare h4 { margin: 0 0 12px; font-size: 15px; display: flex; align-items: center; gap: 8px; }
.compare ul { margin: 0; padding-left: 18px; color: var(--text-dim); font-size: 14px; }
.compare li { margin: 7px 0; }
.pill { font-size: 11px; font-weight: 700; padding: 2px 9px; border-radius: 999px; text-transform: uppercase; letter-spacing: 0.05em; }
.pill.bad { background: var(--bad-soft); color: var(--bad); }
.pill.good { background: var(--good-soft); color: var(--good); }

/* ---------- Architecture workflows ---------- */
.architecture-diagram { margin: 34px 0 38px; }
.architecture-diagram figcaption { margin-bottom: 18px; }
.diagram-order {
  color: var(--accent); font-size: 11px; font-weight: 800; letter-spacing: 0.1em; text-transform: uppercase;
}
.architecture-diagram h3 { margin: 5px 0 5px; font-size: 22px; line-height: 1.25; }
.architecture-diagram figcaption p { margin: 0; max-width: 780px; color: var(--text-dim); font-size: 14.5px; }
.workflow-stack { display: grid; gap: 12px; }
.workflow-row {
  display: grid; grid-template-columns: 190px minmax(0, 1fr) 210px; gap: 16px; align-items: center;
  padding: 18px; border: 1px solid var(--border-soft); border-left: 3px solid var(--text-faint);
  background: var(--bg-elev); border-radius: var(--radius-sm);
}
.container-flow { border-left-color: var(--good); }
.orchestrated-flow { border-left-color: var(--accent); }
.workflow-label { display: flex; align-items: center; gap: 11px; }
.workflow-label div { min-width: 0; }
.workflow-label b, .flow-node b, .service-node b, .azure-source-node b { display: block; font-size: 13px; }
.workflow-label small, .flow-node small, .service-node small, .azure-source-node small {
  display: block; color: var(--text-faint); font-size: 11px; line-height: 1.35;
}
.flow-number {
  display: inline-flex; align-items: center; justify-content: center; flex: 0 0 30px; width: 30px; height: 30px;
  border-radius: 50%; border: 1px solid var(--border); color: var(--text-dim); font-family: var(--mono); font-size: 12px;
}
.flow-steps { display: flex; align-items: stretch; justify-content: center; min-width: 0; }
.flow-node {
  min-width: 112px; flex: 1 1 0; padding: 12px 8px; text-align: center;
  background: var(--bg-elev-2); border: 1px solid var(--border-soft); border-radius: 8px;
}
.flow-node img, .service-node img { display: block; object-fit: contain; margin: 0 auto 8px; }
.flow-node.emphasis-bad { border-color: var(--bad); }
.flow-node.emphasis-good { border-color: var(--good-border); }
.flow-node.emphasis-aks { border-color: var(--accent-border); background: var(--accent-soft); }
.flow-arrow { align-self: center; flex: 0 0 24px; text-align: center; color: var(--text-faint); font-size: 18px; }
.flow-insight { color: var(--text-dim); font-size: 12px; line-height: 1.45; }
.flow-insight b { color: var(--text); }

.azure-diagram {
  padding: 24px; background: var(--bg-elev); border: 1px solid var(--accent-border); border-radius: var(--radius);
}
.azure-source { display: flex; flex-direction: column; align-items: center; }
.azure-source-node {
  display: flex; align-items: center; gap: 12px; width: min(330px, 100%); padding: 13px 16px;
  background: var(--bg-elev-2); border: 1px solid var(--border); border-radius: 8px;
}
.azure-source-node img { flex: 0 0 auto; }
.branch-line { width: 67%; height: 28px; border: solid var(--border); border-width: 0 1px 1px; }
.azure-paths { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.azure-path { display: flex; flex-direction: column; align-items: center; min-width: 0; }
.path-label {
  width: 100%; padding: 7px 10px; text-align: center; color: var(--text-dim); background: var(--bg-elev-2);
  border-top: 3px solid var(--text-faint); font-size: 12px; font-weight: 800; text-transform: uppercase;
}
.container-path .path-label { border-top-color: var(--good); }
.aks-path .path-label { border-top-color: var(--accent); }
.service-node {
  width: 100%; min-height: 132px; padding: 14px 10px; text-align: center; border-bottom: 1px solid var(--border-soft);
}
.path-arrow { height: 24px; color: var(--text-faint); line-height: 24px; }
.ownership {
  width: 100%; min-height: 44px; padding: 8px 10px; display: flex; align-items: center; justify-content: center;
  text-align: center; font-size: 11px; font-weight: 700; border-radius: 6px;
}
.ownership.customer { color: var(--bad); background: var(--bad-soft); }
.ownership.shared { color: var(--good); background: var(--good-soft); }
.ownership.managed { color: var(--accent); background: var(--accent-soft); }
.diagram-legend {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 22px; padding-top: 18px;
  border-top: 1px solid var(--border); color: var(--text-dim); font-size: 12px; line-height: 1.45;
}
.diagram-legend b { color: var(--text); }
.legend-mark { display: inline-block; width: 8px; height: 8px; margin-right: 7px; border-radius: 50%; background: var(--text-faint); }
.legend-mark.container { background: var(--good); }
.legend-mark.aks { background: var(--accent); }

/* ---------- Timeline / phases ---------- */
.phase-list { display: grid; gap: 14px; }
.phase {
  background: var(--bg-elev); border: 1px solid var(--border-soft); border-radius: var(--radius);
  padding: 20px 22px; display: grid; grid-template-columns: 54px 1fr auto; gap: 18px; align-items: center;
}
.phase .num {
  width: 54px; height: 54px; border-radius: 14px; display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 20px; color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
}
.phase h3 { margin: 0 0 4px; font-size: 17px; }
.phase p { margin: 0; color: var(--text-dim); font-size: 14px; }
.phase .meta { text-align: right; color: var(--text-faint); font-size: 12px; white-space: nowrap; }

/* ---------- Code ---------- */
pre {
  background: var(--code-bg); border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 16px 18px; overflow-x: auto; margin: 12px 0; color: #d8e2f2;
}
code { font-family: var(--mono); font-size: 13px; }
p code, li code, td code {
  background: var(--bg-elev-2); border: 1px solid var(--border-soft);
  padding: 1px 6px; border-radius: 6px; font-size: 12.5px; color: var(--text);
}
pre code { background: none; border: none; padding: 0; }
.cmt { color: #6b7a95; }

/* ---------- Callouts ---------- */
.note {
  border-radius: var(--radius-sm); padding: 14px 16px; margin: 16px 0; font-size: 14px;
  border: 1px solid var(--border); background: var(--bg-elev); color: var(--text-dim);
}
.note.info { border-left: 3px solid var(--accent); }
.note.warn { border-left: 3px solid var(--warn); }
.note.good { border-left: 3px solid var(--good); }
.note b { color: var(--text); }

/* ---------- Lab activities ---------- */
.mode-bar {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  background: var(--bg-elev); border: 1px solid var(--border-soft); border-radius: 999px;
  padding: 7px 10px; margin: 0 0 8px;
}
.mode-label {
  color: var(--text-faint); font-size: 11px; font-weight: 800; letter-spacing: 0.08em;
  text-transform: uppercase; padding-left: 4px;
}
.seg { display: inline-flex; background: var(--bg-elev-2); border-radius: 999px; padding: 3px; }
.seg button {
  border: none; background: transparent; color: var(--text-dim); font-weight: 600; font-size: 13px;
  padding: 6px 14px; border-radius: 999px; cursor: pointer;
}
.seg button.active { background: var(--accent); color: #fff; }
.seg button:focus-visible { outline: 2px solid var(--accent-2); outline-offset: 2px; }
.progress-txt { margin-left: auto; color: var(--text-faint); font-size: 13px; font-weight: 600; }
.reset-progress {
  border: 0; padding: 0; background: transparent; color: var(--text-faint); font: inherit;
  text-decoration: underline; cursor: pointer;
}
.reset-progress:hover { color: var(--bad); }
.reset-progress:focus-visible { outline: 2px solid var(--accent-2); outline-offset: 3px; border-radius: 2px; }

.game-panel {
  display: grid; grid-template-columns: 170px minmax(180px, 1fr); gap: 10px 18px;
  align-items: center; padding: 14px 4px 10px; margin-bottom: 8px;
}
.game-level { display: grid; gap: 2px; }
.game-kicker {
  color: var(--text-faint); font-size: 10px; font-weight: 800; letter-spacing: 0.08em; text-transform: uppercase;
}
.game-level strong { color: var(--accent); font-size: 20px; }
.game-level > span:last-child { color: var(--text-faint); font-size: 12px; }
.game-track {
  height: 10px; overflow: hidden; background: var(--bg-elev-2); border: 1px solid var(--border-soft); border-radius: 999px;
}
.game-track > span {
  display: block; width: 0; height: 100%; background: linear-gradient(90deg, var(--accent), var(--good));
  border-radius: inherit; transition: width 0.35s ease;
}
.achievement-list { grid-column: 1 / -1; display: flex; gap: 7px; flex-wrap: wrap; }
.achievement {
  color: var(--text-faint); border: 1px dashed var(--border); padding: 5px 9px; border-radius: 7px;
  font-size: 11px; font-weight: 700; opacity: 0.7;
}
.achievement.unlocked { color: var(--good); background: var(--good-soft); border-style: solid; border-color: var(--good-border); opacity: 1; }
.points-guide { grid-column: 1 / -1; color: var(--text-faint); font-size: 12px; }
.points-guide summary { display: inline; cursor: pointer; font-weight: 700; }
.points-guide span { margin-left: 8px; }

.phase-block { margin: 36px 0; }
.phase-head {
  display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap;
  padding-bottom: 12px; border-bottom: 2px solid var(--border); margin-bottom: 6px;
}
.phase-head h2 { font-size: 24px; margin: 0; letter-spacing: -0.02em; }
.phase-head .sub { color: var(--text-dim); font-size: 14px; }
.phase-head .count { margin-left: auto; color: var(--text-faint); font-size: 13px; font-weight: 600; }

.success-banner {
  display: inline-flex; align-items: center; gap: 8px; font-size: 13px; font-weight: 700;
  color: var(--good); background: var(--good-soft); border: 1px solid var(--good-border);
  padding: 6px 12px; border-radius: 999px; margin: 8px 0;
}

.activity {
  background: var(--bg-elev); border: 1px solid var(--border-soft); border-radius: var(--radius);
  margin: 14px 0; overflow: hidden;
}
.activity > summary {
  list-style: none; cursor: pointer; padding: 16px 20px; display: flex; align-items: center; gap: 14px;
}
.activity > summary::-webkit-details-marker { display: none; }
.activity > summary::after {
  content: ""; width: 7px; height: 7px; margin-left: auto; flex: 0 0 7px;
  border-right: 2px solid var(--text-faint); border-bottom: 2px solid var(--text-faint);
  transform: rotate(-45deg); transition: transform 0.15s;
}
.activity[open] > summary::after { transform: rotate(45deg); }
.activity .aid {
  font-family: var(--mono); font-size: 12px; font-weight: 700; color: var(--accent);
  background: var(--accent-soft); border: 1px solid var(--accent-border);
  padding: 4px 9px; border-radius: 7px; white-space: nowrap;
}
.activity .atitle { font-weight: 650; font-size: 15.5px; }
.activity .atime { margin-left: auto; color: var(--text-faint); font-size: 12px; white-space: nowrap; padding-right: 6px; }
.activity .body { padding: 4px 20px 20px; border-top: 1px solid var(--border-soft); }

.step-block { margin: 16px 0; }
.step-block h5 {
  margin: 0 0 8px; font-size: 12px; letter-spacing: 0.08em; text-transform: uppercase; font-weight: 800;
  display: flex; align-items: center; gap: 8px;
}
.step-block.precheck h5 { color: var(--accent-2); }
.step-block.do h5 { color: var(--accent); }
.step-block.validation h5 { color: var(--good); }
.step-block.postcheck h5 { color: var(--warn); }
.step-block.help h5 { color: var(--text-dim); }
.step-block ul, .step-block ol { margin: 0; padding-left: 20px; color: var(--text-dim); font-size: 14px; }
.step-block li { margin: 6px 0; }
.step-sequence-note {
  margin: 16px 0 10px; padding: 11px 13px; color: var(--text); font-size: 13px; font-weight: 650;
  background: var(--accent-soft); border: 1px solid var(--accent-border); border-radius: var(--radius-sm);
}
.step-block.do > ol { list-style: none; padding-left: 0; counter-reset: none; }
.step-block.do > ol > .lab-step {
  position: relative; margin: 10px 0; padding: 13px 14px; color: var(--text);
  background: var(--bg-elev-2); border: 1px solid var(--border-soft); border-radius: var(--radius-sm);
  transition: border-color 0.15s, opacity 0.15s;
}
.step-block.do > ol > .lab-step.step-current { border-color: var(--accent); }
.step-block.do > ol > .lab-step.step-complete { border-color: var(--good-border); background: var(--good-soft); }
.step-number {
  display: block; margin-bottom: 6px; color: var(--accent); font-family: var(--mono);
  font-size: 11px; font-weight: 800; letter-spacing: 0.04em; text-transform: uppercase;
}
.step-confirm-row {
  display: flex; align-items: flex-start; gap: 9px; width: fit-content; margin-top: 12px;
  color: var(--text-dim); font-size: 12px; font-weight: 700; cursor: pointer;
}
.step-confirm-row input { width: 16px; height: 16px; flex: 0 0 16px; margin: 1px 0 0; accent-color: var(--good); cursor: pointer; }
.step-confirm-row input:disabled { cursor: not-allowed; }
.step-block.validation { background: var(--good-soft); border: 1px solid var(--good-border); border-radius: var(--radius-sm); padding: 12px 16px; }
.step-block.validation p { margin: 0; color: var(--text); font-size: 14px; }
.step-block.help { background: var(--bg-elev-2); border-left: 3px solid var(--text-faint); border-radius: var(--radius-sm); padding: 12px 16px; }
.step-block.help p { margin: 0; color: var(--text-dim); font-size: 14px; }

.foundation-block { margin-top: 18px; }
.lab-start {
  display: grid; grid-template-columns: 1.3fr 1fr; gap: 18px; margin: 16px 0 22px; padding: 20px;
  background: var(--accent-soft); border: 1px solid var(--accent-border); border-radius: var(--radius);
}
.lab-start h3, .coverage-head h3 { margin: 4px 0 6px; }
.lab-start p, .coverage-head p { margin: 0; color: var(--text-dim); font-size: 14px; }
.lab-start .idx, .coverage-head .idx { color: var(--accent); font-size: 11px; font-weight: 800; letter-spacing: 0.1em; }
.lab-prereqs { display: grid; gap: 5px; align-content: center; color: var(--text-dim); font-size: 13px; }
.lab-prereqs b { color: var(--text); margin-bottom: 2px; }
.lab-prereqs span::before { content: "✓"; color: var(--good); margin-right: 7px; font-weight: 800; }
.foundation-activity { border-left: 3px solid var(--accent); }
.lab-goal {
  display: grid; grid-template-columns: 74px 1fr; gap: 10px; margin: 16px 0; padding: 10px 12px;
  background: var(--accent-soft); border-radius: var(--radius-sm); font-size: 13px;
}
.lab-goal b { color: var(--accent); text-transform: uppercase; letter-spacing: 0.06em; font-size: 11px; }
.lab-goal span { color: var(--text); }
.coverage-map { margin-top: 24px; padding: 22px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg-elev); }
.coverage-head { margin-bottom: 16px; }
.coverage-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 9px; }
.coverage-grid a { display: block; padding: 11px 12px; border: 1px solid var(--border-soft); border-radius: 7px; background: var(--bg-elev-2); }
.coverage-grid a:hover { border-color: var(--accent); text-decoration: none; }
.coverage-grid b { display: block; color: var(--text); font-size: 13px; }
.coverage-grid span { display: block; color: var(--text-faint); font-size: 11px; }

.hand-off {
  background: linear-gradient(135deg, var(--accent-soft), transparent);
  border: 1px solid var(--accent-border);
  border-radius: var(--radius); padding: 26px; margin-top: 24px;
}
.hand-off h3 { margin: 0 0 8px; }
.hand-off p { color: var(--text-dim); margin: 0 0 14px; }

/* ---------- Footer ---------- */
footer { border-top: 1px solid var(--border-soft); padding: 34px 0 60px; color: var(--text-faint); font-size: 13px; }
footer .wrap { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; align-items: center; }
footer a { color: var(--text-dim); }

/* ---------- Completion state ---------- */
.done-row {
  display: flex; align-items: center; gap: 10px; cursor: pointer;
  font-size: 13px; font-weight: 600; color: var(--text-dim);
  background: var(--bg-elev-2); border: 1px solid var(--border-soft);
  border-radius: 999px; padding: 8px 14px; margin: 6px 0 16px; width: fit-content;
}
.done-row input { width: 16px; height: 16px; accent-color: var(--good); cursor: pointer; }
.done-row.completion-locked { opacity: 0.6; cursor: not-allowed; }
.done-row input:disabled { cursor: not-allowed; }
.activity.completed > summary { background: var(--good-soft); }
.activity.completed .aid::after { content: " \2713"; color: var(--good); }

/* ---------- Utilities ---------- */
.mt-20 { margin-top: 20px; }
.mt-16 { margin-top: 16px; }
.hero-lab { padding-bottom: 24px; }
.h1-lab { font-size: clamp(28px, 4.4vw, 44px); }
.phase-block.first { border-top: none; padding-top: 8px; }

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .grid-2, .grid-3, .compare, .stat-row { grid-template-columns: 1fr; }
  .stat-row { grid-template-columns: repeat(2, 1fr); }
  .phase { grid-template-columns: 44px 1fr; }
  .phase .meta { grid-column: 2; text-align: left; }
  .workflow-row { grid-template-columns: 1fr; }
  .workflow-label { border-bottom: 1px solid var(--border-soft); padding-bottom: 12px; }
  .flow-insight { padding-top: 2px; }
  .diagram-legend { grid-template-columns: 1fr; }
  .coverage-grid { grid-template-columns: repeat(2, 1fr); }
  .nav-links .theme-btn { align-self: flex-start; margin-top: 6px; }
}

@media (max-width: 600px) {
  .wrap { padding-inline: 16px; }
  .nav-inner { padding-inline: 16px; flex-wrap: wrap; gap: 8px; }
  .brand { min-width: 0; }
  .brand small { display: none; }
  .nav-links { padding-inline: 16px; }
  .architecture-diagram h3 { font-size: 19px; }
  .azure-diagram { padding: 18px 14px; }
  .flow-steps { flex-direction: column; }
  .flow-node { width: 100%; }
  .flow-arrow { transform: rotate(90deg); min-height: 24px; }
  .branch-line { display: none; }
  .azure-paths { grid-template-columns: 1fr; gap: 22px; }
  .azure-path { border-top: 1px solid var(--border); padding-top: 10px; }
  .lab-start { grid-template-columns: 1fr; padding: 16px; }
  .lab-goal { grid-template-columns: 1fr; gap: 3px; }
  .coverage-map { padding: 16px; }
  .coverage-grid { grid-template-columns: 1fr; }
  .service-node { min-height: 0; }
  .hero { padding-top: 48px; }
  .hero-cta .btn { flex: 1 1 100%; justify-content: center; }
  .stat-row { gap: 10px; margin-top: 32px; }
  .stat { padding: 14px; }
  section { padding-block: 40px; }
  .card, .compare .col { padding: 18px; }
  .mode-bar { border-radius: var(--radius); }
  .progress-txt { flex-basis: 100%; margin-left: 0; text-align: center; }
  .phase-head .count { flex-basis: 100%; margin-left: 0; }
  .activity > summary {
    display: grid; grid-template-columns: auto minmax(0, 1fr) auto; gap: 6px 10px; padding: 14px 16px;
  }
  .activity > summary::after { grid-column: 3; grid-row: 1 / span 2; align-self: center; }
  .activity .atitle { align-self: center; }
  .activity .atime { grid-column: 2; margin-left: 0; padding-right: 0; }
  .activity .body { padding: 4px 16px 16px; }
  .kc, .hand-off { padding: 16px; }
  .checklist li { display: grid; grid-template-columns: 20px minmax(0, 1fr); gap: 4px 10px; align-items: start; }
  .checklist .val2 { grid-column: 2; white-space: normal; }
  .name-input { width: 100%; min-width: 0; }
  .cert { padding: 24px 16px; }
}

/* ---------- Instructor-led talk tracks ---------- */
.led-note {
  display: none;
  border-radius: var(--radius-sm); padding: 12px 16px; margin: 12px 0; font-size: 13.5px;
  border: 1px solid var(--accent-border); border-left: 3px solid var(--accent-2);
  background: color-mix(in srgb, var(--accent-2) 9%, var(--bg-elev));
  color: var(--text-dim);
}
.led-note b { color: var(--text); }
.led-note .tt-label {
  display: inline-block; font-size: 11px; font-weight: 800; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--accent-2); margin-right: 8px;
}
body.mode-led .led-note { display: block; }

/* ---------- Knowledge check ---------- */
.kc {
  background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 18px 20px; margin: 16px 0;
}
.kc.kc-pre { border-left: 3px solid var(--accent-2); }
.kc.kc-post { border-left: 3px solid var(--warn); }
.kc-head { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 6px; }
.kc-head h4 { margin: 0; font-size: 15px; }
.kc-badge {
  font-size: 11px; font-weight: 800; letter-spacing: 0.06em; text-transform: uppercase;
  padding: 3px 9px; border-radius: 999px; white-space: nowrap;
}
.kc-pre .kc-badge { color: var(--accent-2); background: color-mix(in srgb, var(--accent-2) 14%, transparent); }
.kc-post .kc-badge { color: var(--warn); background: var(--warn-soft); }
.kc-desc { color: var(--text-faint); font-size: 13px; margin: 0 0 12px; }
.kc-q { margin: 14px 0; }
.kc-q > p { margin: 0 0 8px; font-weight: 600; font-size: 14.5px; }
.kc-opt {
  display: flex; align-items: flex-start; gap: 10px; padding: 9px 12px; margin: 6px 0;
  border: 1px solid var(--border-soft); border-radius: var(--radius-sm); cursor: pointer;
  font-size: 14px; color: var(--text-dim); background: var(--bg-elev-2);
}
.kc-opt:hover { border-color: var(--border); }
.kc-opt input { margin-top: 3px; accent-color: var(--accent); }
.kc-opt.correct { border-color: var(--good); background: var(--good-soft); color: var(--text); }
.kc-opt.wrong { border-color: var(--bad); background: var(--bad-soft); color: var(--text); }
.kc-why {
  display: none; margin: 6px 0 0; font-size: 13px; color: var(--text-dim);
  border-left: 2px solid var(--border); padding-left: 10px;
}
.kc.revealed .kc-why { display: block; }
.kc-actions { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; margin-top: 10px; }
.kc-btn {
  border: 1px solid var(--border); background: var(--bg-elev-2); color: var(--text);
  font-weight: 600; font-size: 13px; padding: 8px 16px; border-radius: 9px; cursor: pointer;
}
.kc-btn.primary { background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #fff; border-color: transparent; }
.kc-btn:disabled { opacity: 0.5; cursor: not-allowed; }
.kc-result { margin-top: 12px; font-size: 14px; }
.kc-locked { color: var(--text-faint); font-size: 13px; font-style: italic; }

/* lift meter */
.lift-meter { display: grid; gap: 6px; margin: 10px 0 4px; }
.lift-row { display: flex; align-items: center; gap: 10px; font-size: 13px; }
.lift-row .lbl { width: 84px; color: var(--text-faint); }
.lift-bar { flex: 1; height: 10px; border-radius: 999px; background: var(--bg-elev-2); overflow: hidden; border: 1px solid var(--border-soft); }
.lift-bar > span { display: block; height: 100%; border-radius: 999px; }
.lift-bar.pre > span { background: var(--accent-2); }
.lift-bar.post > span { background: var(--good); }
.lift-val { width: 46px; text-align: right; font-weight: 700; }
.kc-verdict { font-weight: 700; padding: 8px 12px; border-radius: 9px; margin-top: 10px; display: inline-block; }
.kc-verdict.pass { color: var(--good); background: var(--good-soft); border: 1px solid var(--good-border); }
.kc-verdict.fail { color: var(--warn); background: var(--warn-soft); border: 1px solid var(--warn); }

/* ---------- Points HUD ---------- */
.pts { color: var(--accent); font-weight: 800; }
.pts-hud {
  display: inline-flex; align-items: center; gap: 6px; margin-left: 10px;
  background: var(--accent-soft); border: 1px solid var(--accent-border);
  color: var(--accent); font-weight: 700; font-size: 12px; padding: 4px 10px; border-radius: 999px;
}

/* ---------- Completion / certificate page ---------- */
.cert {
  background: linear-gradient(135deg, var(--accent-soft), transparent), var(--bg-elev);
  border: 1px solid var(--accent-border); border-radius: var(--radius);
  padding: 34px; text-align: center; box-shadow: var(--shadow);
}
.cert .seal {
  width: 74px; height: 74px; border-radius: 50%; margin: 0 auto 14px;
  display: flex; align-items: center; justify-content: center; font-size: 34px; color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
}
.cert h2 { font-size: clamp(24px, 3.6vw, 36px); margin: 0 0 8px; letter-spacing: -0.02em; }
.cert .who { font-size: 22px; font-weight: 800; color: var(--accent); margin: 8px 0; min-height: 28px; }
.cert .cert-lede { color: var(--text-dim); max-width: 620px; margin: 0 auto 8px; }
.cert .meta { color: var(--text-faint); font-size: 13px; margin-top: 6px; }
.score-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin: 24px 0; }
.score { background: var(--bg-elev); border: 1px solid var(--border-soft); border-radius: var(--radius); padding: 18px; }
.score b { display: block; font-size: 28px; font-weight: 800; letter-spacing: -0.02em; }
.score span { color: var(--text-faint); font-size: 12px; }
.checklist { list-style: none; padding: 0; margin: 16px 0; }
.checklist li { display: flex; align-items: center; gap: 12px; padding: 12px 4px; border-bottom: 1px solid var(--border-soft); font-size: 14.5px; }
.checklist .mark { font-weight: 800; font-size: 16px; width: 20px; text-align: center; }
.checklist .mark.ok { color: var(--good); }
.checklist .mark.no { color: var(--bad); }
.checklist .lbl2 { flex: 1; }
.checklist .val2 { color: var(--text-faint); font-size: 13px; white-space: nowrap; }
.name-input {
  padding: 10px 14px; border-radius: 10px; border: 1px solid var(--border);
  background: var(--bg-elev-2); color: var(--text); font-size: 15px; min-width: 260px; text-align: center;
}
@media print {
  .nav, footer, .no-print { display: none !important; }
  .cert { box-shadow: none; }
}
@media (max-width: 860px) {
  .score-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 520px) {
  .game-panel { grid-template-columns: 1fr; gap: 8px; }
  .game-track, .achievement-list, .points-guide { grid-column: 1; }
  .points-guide span { display: block; margin: 5px 0 0; }
}