:root {
  --bg: #f8f9fb;
  --bg-soft: #ffffff;
  --ink: #1a1a2e;
  --muted: #5f6b7a;
  --line: rgba(0, 0, 0, 0.08);
  --card: #ffffff;
  --card-strong: #ffffff;
  --primary: #0db7ed;
  --primary-deep: #086f8e;
  --primary-soft: rgba(13, 183, 237, 0.08);
  --sea: #2f819d;
  --mint: #10b981;
  --mint-soft: rgba(16, 185, 129, 0.08);
  --gold: #f59e0b;
  --violet: #7c3aed;
  --red: #ef4444;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.08);
  --radius-xl: 16px;
  --radius-lg: 12px;
  --radius-md: 8px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

html,
body {
  max-width: 100%;
  overflow-x: hidden;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: "Inter", "SF Pro Display", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
}

body.lms-sidebar-open {
  overflow: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

img,
svg,
video,
canvas {
  max-width: 100%;
  height: auto;
}

code, pre {
  font-family: "JetBrains Mono", "Fira Code", "SFMono-Regular", Consolas, monospace;
}

/* ── Site wrapper ── */
.site {
  width: min(1200px, calc(100% - 32px));
  margin: 0 auto;
  padding: 16px 0 48px;
}

/* ── Topbar ── */
.topbar {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 16px;
  padding: 12px 20px;
  border-radius: var(--radius-lg);
  background: #fff;
  border: 1px solid var(--line);
  border-top: 3px solid var(--primary);
  box-shadow: var(--shadow-sm);
}

.lms-mobile-nav-button {
  display: none;
  align-items: center;
  gap: 8px;
  min-height: 38px;
  padding: 0 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--ink);
  font-size: 0.82rem;
  font-weight: 700;
  cursor: pointer;
}

.lms-mobile-nav-button span[aria-hidden="true"] {
  font-size: 1rem;
  line-height: 1;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}

.brand-mark {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  font-size: 1.3rem;
  background: var(--primary-soft);
}

.brand-sub {
  color: var(--muted);
  font-size: 0.85rem;
  padding-left: 16px;
  border-left: 1px solid var(--line);
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--primary-soft);
  border: 1px solid rgba(13, 183, 237, 0.15);
  color: var(--primary-deep);
  font-size: 0.8rem;
  font-weight: 600;
}

/* ── Layout ── */
.layout {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 24px;
  margin-top: 20px;
}

/* ── Sidebar ── */
.sidebar {
  position: sticky;
  top: 16px;
  align-self: start;
  padding: 20px 16px;
  border-radius: var(--radius-xl);
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
}

.lms-sidebar-close,
.lms-sidebar-backdrop {
  display: none;
}

.lms-sidebar-close {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 36px;
  height: 36px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--bg);
  color: var(--ink);
  font-size: 1.2rem;
  font-weight: 700;
  cursor: pointer;
}

.sidebar h2,
.section-head h1,
.section-head h2,
.hero h1,
.card h3,
.feature-card h3,
.diagram-card h3,
.footer-card h3 {
  margin: 0;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.sidebar p, p, li {
  color: var(--muted);
  line-height: 1.7;
  font-size: 0.9rem;
}

.sidebar-head {
  padding: 0 0 16px;
  border-bottom: 1px solid var(--line);
}

.sidebar-head h2 {
  font-size: 1rem;
  color: var(--ink);
}

.sidebar-head p {
  margin: 8px 0 0;
  font-size: 0.82rem;
}

.sidebar-nav {
  display: grid;
  gap: 4px;
  margin-top: 16px;
}

.sidebar-link {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 10px;
  padding: 10px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  transition: background 150ms ease, border-color 150ms ease;
}

.sidebar-link:hover {
  background: var(--bg);
  border-color: var(--line);
}

.sidebar-link.active {
  background: var(--primary-soft);
  border-color: rgba(13, 183, 237, 0.2);
}

.sidebar-link.active strong {
  color: var(--primary-deep);
}

.sidebar-link.completed {
  border-color: rgba(16, 185, 129, 0.22);
  background: rgba(16, 185, 129, 0.07);
}

.sidebar-link.completed strong::after {
  content: " ✓";
  color: var(--mint);
  font-weight: 800;
}

.sidebar-link strong {
  display: block;
  color: var(--ink);
  font-size: 0.88rem;
}

.sidebar-link span {
  font-size: 0.8rem;
  line-height: 1.4;
}

.icon-badge {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-md);
  color: #fff;
  font-weight: 700;
  font-size: 0.82rem;
}

.icon-orange { background: var(--gold); }
.icon-sea { background: var(--primary); }
.icon-mint { background: var(--mint); }
.icon-violet { background: var(--violet); }

/* ── Progress card ── */
.progress-card {
  margin-top: 16px;
  padding: 14px;
  border-radius: var(--radius-lg);
  background: var(--bg);
  border: 1px solid var(--line);
}

.progress-card > strong {
  font-size: 0.85rem;
}

.progress-card p {
  margin: 6px 0 0;
  font-size: 0.8rem;
}

.progress-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 12px;
  font-size: 0.78rem;
  color: var(--muted);
}

.progress-track {
  margin-top: 8px;
  height: 6px;
  border-radius: 999px;
  overflow: hidden;
  background: rgba(0, 0, 0, 0.06);
}

.progress-fill {
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--primary), var(--mint));
  transition: width 600ms ease;
}

.progress-steps {
  display: grid;
  gap: 6px;
  margin-top: 12px;
}

.progress-step {
  display: grid;
  grid-template-columns: 10px 1fr auto;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 0.78rem;
}

.progress-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.1);
}

.progress-step.done .progress-dot {
  background: var(--mint);
}

.progress-step.active .progress-dot {
  background: var(--primary);
  animation: pulseDot 2s ease-in-out infinite;
}

/* ── Content area ── */
.content {
  display: grid;
  gap: 20px;
  min-width: 0;
}

/* ── Hero ── */
.hero, .panel {
  border-radius: var(--radius-xl);
  padding: 28px;
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.hero {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 28px;
  overflow: hidden;
  position: relative;
}

.hero::before {
  content: "";
  position: absolute;
  right: -60px;
  top: -60px;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(13, 183, 237, 0.1), transparent 70%);
}

.eyebrow, .tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  width: fit-content;
  padding: 5px 12px;
  border-radius: 999px;
  background: var(--primary-soft);
  border: 1px solid rgba(13, 183, 237, 0.15);
  color: var(--primary-deep);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.hero h1 {
  margin-top: 14px;
  font-size: clamp(1.8rem, 3.2vw, 2.6rem);
  line-height: 1.15;
  letter-spacing: -0.03em;
}

.hero p {
  max-width: 560px;
  margin: 12px 0 0;
  font-size: 0.92rem;
  line-height: 1.7;
}

.hero-actions,
.hero-stats,
.section-grid,
.feature-grid,
.diagram-grid,
.two-up,
.three-up,
.footer-grid {
  display: grid;
  gap: 14px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  margin-top: 18px;
}

/* ── Buttons ── */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 0 18px;
  max-width: 100%;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  font-weight: 600;
  line-height: 1.35;
  text-align: center;
  white-space: normal;
  transition: transform 120ms ease, box-shadow 120ms ease;
  cursor: pointer;
}

.button:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}

.button-primary {
  color: #fff;
  background: var(--primary);
  border: none;
}

.button-primary:hover {
  background: var(--primary-deep);
}

.button-secondary {
  background: #fff;
  border: 1px solid var(--line);
  color: var(--ink);
}

.button-secondary:hover {
  border-color: var(--primary);
  color: var(--primary-deep);
}

/* ── Hero stats ── */
.hero-stats {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 18px;
}

.stat {
  padding: 12px;
  border-radius: var(--radius-md);
  background: var(--bg);
  border: 1px solid var(--line);
}

.stat strong {
  display: block;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.stat span {
  display: block;
  margin-top: 4px;
  font-size: 0.8rem;
  color: var(--muted);
}

/* ── Hero visual / orbit ── */
.hero-visual {
  border-radius: var(--radius-lg);
  padding: 16px;
  border: 1px solid var(--line);
  background: var(--bg);
}

.visual-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 14px;
}

.visual-label {
  font-weight: 700;
  font-size: 0.88rem;
  color: var(--primary-deep);
}

.hero-graphic {
  display: grid;
  gap: 12px;
}

.hero-orbit {
  position: relative;
  min-height: 250px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  background: #fff;
}

.orbit-ring {
  position: absolute;
  inset: 30px;
  border-radius: 50%;
  border: 2px dashed rgba(13, 183, 237, 0.18);
}

.orbit-core {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 100px;
  height: 100px;
  transform: translate(-50%, -50%);
  display: grid;
  place-items: center;
  border-radius: 20px;
  color: white;
  text-align: center;
  font-weight: 800;
  font-size: 0.95rem;
  background: linear-gradient(135deg, var(--primary), var(--primary-deep));
  box-shadow: 0 8px 24px rgba(13, 183, 237, 0.25);
}

.orbit-core small {
  display: block;
  margin-top: 2px;
  font-size: 0.65rem;
  font-weight: 600;
  opacity: 0.85;
}

.orbit-node {
  position: absolute;
  width: 105px;
  padding: 10px 8px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: #fff;
  text-align: center;
  box-shadow: var(--shadow-sm);
}

.orbit-node strong {
  display: block;
  margin-top: 4px;
  font-size: 0.82rem;
}

.orbit-node span {
  display: block;
  font-size: 0.72rem;
  color: var(--muted);
}

.orbit-node.node-top { left: 50%; top: 14px; transform: translateX(-50%); }
.orbit-node.node-right { right: 10px; top: 50%; transform: translateY(-50%); }
.orbit-node.node-bottom { left: 50%; bottom: 14px; transform: translateX(-50%); }
.orbit-node.node-left { left: 10px; top: 50%; transform: translateY(-50%); }

.orbit-icon {
  width: 28px;
  height: 28px;
  margin: 0 auto;
  display: grid;
  place-items: center;
  border-radius: var(--radius-md);
  color: #fff;
  font-weight: 700;
  font-size: 0.75rem;
}

.orbit-icon.orange { background: var(--gold); }
.orbit-icon.sea { background: var(--primary); }
.orbit-icon.mint { background: var(--mint); }
.orbit-icon.violet { background: var(--violet); }

.hero-caption {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.caption-pill {
  padding: 8px 10px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: #fff;
  text-align: center;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--muted);
}

/* ── Section head ── */
.section-head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: end;
  gap: 14px;
  margin-bottom: 20px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line);
}

.section-head h1,
.section-head h2 {
  font-size: clamp(1.4rem, 2.2vw, 1.9rem);
  margin-top: 8px;
}

.section-head p {
  max-width: 480px;
  margin: 0;
  font-size: 0.88rem;
}

/* ── Grids ── */
.section-grid, .feature-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.three-up {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.two-up, .diagram-grid, .footer-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

/* ── Cards ── */
.card,
.feature-card,
.diagram-card,
.footer-card {
  min-width: 0;
  border-radius: var(--radius-lg);
  padding: 20px;
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
  transition: box-shadow 200ms ease;
}

.card:hover,
.feature-card:hover {
  box-shadow: var(--shadow);
}

.card-header {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 10px;
}

.card-icon {
  width: 34px;
  height: 34px;
  flex: 0 0 auto;
}

.card h3,
.feature-card h3,
.diagram-card h3,
.footer-card h3 {
  font-size: 1rem;
  color: var(--ink);
}

.card ul,
.footer-card ul,
.footer-card ol {
  margin: 10px 0 0;
  padding-left: 20px;
}

.card li,
.footer-card li {
  margin-bottom: 4px;
}

/* ── Feature cards ── */
.feature-card {
  position: relative;
  border-left: 3px solid var(--primary);
}

.feature-top {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.feature-mark {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-md);
  color: #fff;
  font-weight: 700;
  font-size: 0.85rem;
}

/* ── Diagram cards ── */
.diagram-card {
  background: var(--bg);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
}

.diagram-card h3 {
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 4px;
}

/* ── Flow lane ── */
.flow-lane {
  display: grid;
  grid-template-columns: 1fr 30px 1fr 30px 1fr 30px 1fr;
  gap: 8px;
  align-items: center;
  margin-top: 14px;
}

.flow-step {
  min-height: 100px;
  padding: 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: #fff;
}

.flow-step strong {
  display: block;
  margin-bottom: 6px;
  color: var(--primary-deep);
  font-size: 0.85rem;
}

.arrow {
  position: relative;
  height: 2px;
  background: linear-gradient(90deg, rgba(13, 183, 237, 0.2), rgba(13, 183, 237, 0.7));
}

.arrow::after {
  content: "";
  position: absolute;
  right: -2px;
  top: 50%;
  width: 8px;
  height: 8px;
  border-top: 2px solid var(--primary);
  border-right: 2px solid var(--primary);
  transform: translateY(-50%) rotate(45deg);
}

/* ── Stacks ── */
.mini-stack,
.build-chain,
.lifecycle,
.layer-list {
  display: grid;
  gap: 8px;
  margin-top: 12px;
}

.mini-stack div,
.build-chain div,
.lifecycle div,
.layer {
  padding: 12px 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: #fff;
  font-size: 0.88rem;
}

.mini-stack div strong,
.build-chain div strong,
.lifecycle div strong,
.layer strong {
  color: var(--ink);
}

/* ── Callout ── */
.callout {
  margin-top: 14px;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  background: var(--mint-soft);
  border-left: 3px solid var(--mint);
  color: #065f46;
  font-size: 0.88rem;
}

.callout strong {
  color: #064e3b;
}

/* ── Terminal / code ── */
.terminal, .code-box {
  margin-top: 14px;
  padding: 16px 18px;
  border-radius: var(--radius-lg);
  overflow-x: auto;
}

.terminal {
  background: #1e293b;
  color: #e2e8f0;
  border: 1px solid #334155;
}

.code-box {
  background: #0f172a;
  color: #e2e8f0;
  border: 1px solid #1e293b;
}

.terminal code,
.code-box code {
  white-space: pre;
  line-height: 1.7;
  font-size: 0.84rem;
}

/* inline code */
p code, li code, h3 code {
  background: var(--primary-soft);
  color: var(--primary-deep);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.85em;
}

/* ── Compare cards ── */
.compare {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.compare-card {
  padding: 16px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: #fff;
  box-shadow: var(--shadow-sm);
}

.compare-card h3 {
  margin: 0 0 8px;
  font-size: 0.95rem;
}

.compare-card.vm {
  border-left: 4px solid var(--gold);
}

.compare-card.docker {
  border-left: 4px solid var(--mint);
}

/* ── Diagram row (used in system-diagram) ── */
.diagram-row {
  display: grid;
  grid-template-columns: 1fr 34px 1fr;
  gap: 10px;
  align-items: center;
}

.diagram-box {
  padding: 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: #fff;
}

.diagram-box strong {
  display: block;
  margin-bottom: 4px;
}

.system-diagram {
  display: grid;
  gap: 12px;
}

/* ── Page end ── */
.page-end {
  text-align: center;
  color: var(--muted);
  font-size: 0.82rem;
  padding-top: 8px;
}

/* ── Animations ── */
@keyframes pulseDot {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.3); opacity: 0.7; }
}

/* ── Responsive ── */
@media (max-width: 1100px) {
  .site {
    width: min(100%, calc(100% - 24px));
    padding: 12px 0 36px;
  }

  .layout {
    grid-template-columns: 1fr;
  }

  .lms-mobile-nav-button {
    display: inline-flex;
  }

  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 60;
    width: min(360px, calc(100vw - 28px));
    height: 100dvh;
    margin: 0;
    border-radius: 0 24px 24px 0;
    transform: translateX(calc(-100% - 24px));
    transition: transform 220ms ease;
    overflow-y: auto;
    overscroll-behavior: contain;
  }

  .sidebar-head {
    padding-right: 52px;
  }

  .layout.sidebar-open .sidebar {
    transform: translateX(0);
  }

  .lms-sidebar-backdrop {
    position: fixed;
    inset: 0;
    z-index: 55;
    border: none;
    background: rgba(7, 17, 31, 0.52);
    cursor: pointer;
  }

  body.lms-sidebar-open .lms-sidebar-backdrop,
  body.lms-sidebar-open .lms-sidebar-close {
    display: block;
  }
}

@media (max-width: 960px) {
  .site {
    width: min(100%, calc(100% - 20px));
    padding: 10px 0 28px;
  }

  .hero,
  .section-grid,
  .feature-grid,
  .diagram-grid,
  .two-up,
  .three-up,
  .footer-grid,
  .compare {
    grid-template-columns: 1fr;
  }

  .hero-stats,
  .flow-lane,
  .diagram-row,
  .hero-caption {
    grid-template-columns: 1fr;
  }

  .arrow {
    width: 2px;
    height: 20px;
    margin: 0 auto;
    background: linear-gradient(180deg, rgba(13, 183, 237, 0.2), rgba(13, 183, 237, 0.7));
  }

  .arrow::after {
    right: 50%;
    top: auto;
    bottom: -2px;
    transform: translateX(50%) rotate(135deg);
  }

  .hero-actions {
    grid-template-columns: 1fr;
  }

  .topbar {
    border-radius: var(--radius-lg);
    flex-wrap: wrap;
    padding: 12px 14px;
  }

  .brand-sub {
    border-left: none;
    padding-left: 0;
    width: 100%;
  }

  .hero,
  .panel,
  .card,
  .feature-card,
  .diagram-card,
  .footer-card {
    padding: 20px;
  }

  .orbit-node {
    position: static;
    width: auto;
    transform: none !important;
  }

  .hero-orbit {
    min-height: auto;
    display: grid;
    gap: 10px;
    padding: 16px;
  }

  .orbit-ring, .orbit-core {
    position: static;
    transform: none;
  }

  .orbit-core {
    width: 100%;
    height: auto;
    padding: 16px;
    border-radius: var(--radius-md);
  }
}

/* ── LMS enhancements ── */
.topbar {
  position: relative;
}

.lms-topbar-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.lms-chip-button {
  min-height: 36px;
  padding: 0 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--ink);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 140ms ease, border-color 140ms ease, background 140ms ease;
}

.lms-chip-button:hover,
.lms-text-button:hover {
  transform: translateY(-1px);
}

.lms-chip-button:hover {
  border-color: rgba(13, 183, 237, 0.35);
}

.lms-topbar-link {
  min-height: 36px;
}

.lms-tracker-card,
.lms-sidebar-utilities,
.lms-dashboard {
  min-width: 0;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: var(--bg);
}

.lms-tracker-card {
  padding: 16px;
  margin: 16px 0;
}

.lms-tracker-card h3,
.lms-sidebar-utilities h3 {
  margin: 10px 0 0;
  font-size: 1rem;
}

.lms-tracker-metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 10px;
  margin-top: 14px;
}

.lms-tracker-metric {
  padding: 12px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.78);
}

.lms-tracker-metric strong {
  display: block;
  color: var(--ink);
  font-size: 1rem;
}

.lms-tracker-metric span,
.lms-phase-note,
.lms-tracker-note {
  display: block;
  margin-top: 4px;
  color: var(--muted);
  font-size: 0.8rem;
}

.lms-meta-row,
.lms-chip-list {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 14px;
}

.lms-meta-pill,
.lms-study-chip {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 0 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.8);
  color: var(--ink);
  font-size: 0.78rem;
  font-weight: 700;
}

.progress-track-lg {
  margin-top: 14px;
  height: 10px;
}

.progress-inline {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  margin-top: 12px;
}

.progress-inline strong {
  font-size: 1.05rem;
  color: var(--ink);
}

.progress-inline span {
  color: var(--muted);
  font-size: 0.8rem;
}

.lms-phase-pill {
  display: inline-flex;
  margin-top: 14px;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(13, 183, 237, 0.1);
  color: var(--primary-deep);
  font-size: 0.77rem;
  font-weight: 700;
}

.lms-tracker-actions,
.lms-dashboard-actions,
.lms-quick-tools,
.lms-modal-actions,
.lms-celebration-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.lms-tracker-actions {
  margin-top: 16px;
}

.layout > *,
.content > *,
.hero > *,
.section-grid > *,
.feature-grid > *,
.diagram-grid > *,
.two-up > *,
.three-up > *,
.footer-grid > *,
.compare > *,
.flow-lane > *,
.diagram-row > *,
.hero-stats > *,
.hero-caption > *,
.hero-actions > *,
.lms-tracker-metrics > *,
.lms-tracker-actions > *,
.lms-dashboard-actions > *,
.lms-quick-tools > *,
.lms-glossary-grid > *,
.lms-certificate-meta > *,
.lms-certificate-actions > * {
  min-width: 0;
}

.lms-text-button {
  border: none;
  background: transparent;
  color: var(--primary-deep);
  font-size: 0.82rem;
  font-weight: 700;
  cursor: pointer;
  padding: 0;
}

.lms-sidebar-utilities {
  padding: 16px;
  margin-top: 16px;
}

.lms-sidebar-utilities p {
  margin: 8px 0 0;
  font-size: 0.82rem;
}

.lms-dashboard {
  margin-top: 20px;
}

.lms-dashboard .card strong[data-progress-number] {
  display: inline-block;
  font-size: 1.15rem;
  color: var(--ink);
}

.lms-checkpoint-card ul {
  margin-top: 12px;
}

.lms-lesson-nav-card {
  border-left: 3px solid var(--primary);
}

.lms-lesson-nav-card p {
  margin-bottom: 0;
}

.lms-badge-banner {
  margin-top: 14px;
  padding: 10px 12px;
  border-radius: var(--radius-md);
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.24);
  color: #06634a;
  font-size: 0.8rem;
  font-weight: 700;
}

.lms-badge-banner-soft {
  background: rgba(13, 183, 237, 0.08);
  border-color: rgba(13, 183, 237, 0.16);
  color: var(--primary-deep);
}

.lms-quiz-list {
  display: grid;
  gap: 14px;
  margin-top: 14px;
}

.lms-quiz-item {
  padding: 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.76);
}

.lms-quiz-question {
  display: block;
  margin-bottom: 12px;
  color: var(--ink);
  line-height: 1.5;
}

.lms-quiz-options {
  display: grid;
  gap: 10px;
}

.lms-quiz-option {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: #fff;
  cursor: pointer;
}

.lms-quiz-option input {
  margin-top: 2px;
  accent-color: var(--primary);
}

.lms-quiz-option span {
  color: var(--ink);
  font-size: 0.9rem;
  line-height: 1.55;
}

.lms-quiz-feedback {
  min-height: 22px;
  margin: 10px 0 0;
  font-size: 0.82rem;
  font-weight: 600;
}

.lms-quiz-feedback.correct {
  color: #0d7a59;
}

.lms-quiz-feedback.incorrect {
  color: #b42318;
}

.lms-quiz-feedback.warning {
  color: #9a6700;
}

.lms-notes-area {
  width: 100%;
  min-height: 160px;
  margin-top: 12px;
  padding: 14px;
  resize: vertical;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.88);
  color: var(--ink);
  font: inherit;
  line-height: 1.6;
}

.lms-notes-area:focus {
  outline: 2px solid rgba(13, 183, 237, 0.22);
  border-color: rgba(13, 183, 237, 0.44);
}

.lms-lesson-expansion .tag,
.lms-dashboard .tag,
.lms-tracker-card .tag {
  margin-bottom: 2px;
}

.lms-glossary-grid {
  align-items: stretch;
}

.lms-glossary-card {
  height: 100%;
}

.lms-certificate {
  position: relative;
  padding: 32px;
  border-radius: 24px;
  border: 1px solid rgba(13, 183, 237, 0.18);
  background:
    radial-gradient(circle at top right, rgba(13, 183, 237, 0.12), transparent 26%),
    linear-gradient(180deg, rgba(13, 183, 237, 0.04), rgba(16, 185, 129, 0.05)),
    #fff;
  box-shadow: var(--shadow-lg);
  text-align: center;
  overflow: hidden;
}

.lms-certificate::before,
.lms-certificate::after {
  content: "";
  position: absolute;
  inset: 14px;
  border-radius: 18px;
  border: 1px dashed rgba(13, 183, 237, 0.25);
  pointer-events: none;
}

.lms-certificate::after {
  inset: auto -80px -80px auto;
  width: 180px;
  height: 180px;
  border: none;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(245, 158, 11, 0.12), transparent 72%);
}

.lms-certificate-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 36px;
  padding: 0 16px;
  border-radius: 999px;
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.28);
  color: #0f7d5b;
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.lms-certificate h2 {
  margin: 18px 0 0;
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  letter-spacing: -0.04em;
}

.lms-certificate h3 {
  margin: 12px 0 0;
  font-size: clamp(1.7rem, 2.6vw, 2.25rem);
  color: var(--primary-deep);
  letter-spacing: -0.03em;
}

.lms-certificate-sub {
  margin: 14px 0 0;
  font-size: 0.95rem;
  color: var(--muted);
}

.lms-certificate-meta {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 24px;
  text-align: left;
}

.lms-certificate-meta div {
  padding: 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.86);
}

.lms-certificate-meta strong {
  display: block;
  color: var(--ink);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.lms-certificate-meta span {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.55;
}

.lms-certificate-actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 24px;
}

.lms-modal-backdrop,
.lms-celebration-backdrop {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 20px;
  background: rgba(15, 23, 42, 0.52);
  backdrop-filter: blur(8px);
  z-index: 1000;
}

.lms-modal-card,
.lms-celebration-card {
  width: min(560px, 100%);
  padding: 24px;
  border-radius: 20px;
  border: 1px solid var(--line);
  background: #fff;
  box-shadow: var(--shadow-lg);
}

.lms-modal-card h2,
.lms-celebration-card h2 {
  margin: 12px 0 0;
  font-size: 1.65rem;
  letter-spacing: -0.03em;
}

.lms-celebration-card h3 {
  margin: 10px 0 0;
  font-size: 1.05rem;
  color: var(--primary-deep);
}

.lms-field-label {
  display: block;
  margin-top: 16px;
  font-size: 0.84rem;
  font-weight: 700;
  color: var(--ink);
}

.lms-input {
  width: 100%;
  margin-top: 8px;
  min-height: 46px;
  padding: 0 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  font-size: 0.95rem;
}

.lms-input:focus {
  outline: 2px solid rgba(13, 183, 237, 0.25);
  border-color: rgba(13, 183, 237, 0.45);
}

.lms-input-error {
  border-color: rgba(239, 68, 68, 0.55);
}

.lms-modal-actions {
  margin-top: 18px;
}

.lms-burst {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-bottom: 10px;
}

.lms-burst span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--gold), var(--primary));
  animation: burstFloat 1.6s ease-in-out infinite;
}

.lms-burst span:nth-child(2) { animation-delay: 0.1s; }
.lms-burst span:nth-child(3) { animation-delay: 0.2s; }
.lms-burst span:nth-child(4) { animation-delay: 0.3s; }
.lms-burst span:nth-child(5) { animation-delay: 0.4s; }

.lms-celebration-card {
  text-align: center;
  animation: celebrationPop 420ms ease;
}

.lms-celebration-card p {
  margin-top: 10px;
}

@keyframes burstFloat {
  0%, 100% { transform: translateY(0) scale(1); opacity: 1; }
  50% { transform: translateY(-8px) scale(1.12); opacity: 0.75; }
}

@keyframes celebrationPop {
  0% { transform: scale(0.92); opacity: 0; }
  100% { transform: scale(1); opacity: 1; }
}

html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #07111f;
  --bg-soft: #0b1729;
  --ink: #e8eef8;
  --muted: #9fb2c8;
  --line: rgba(148, 163, 184, 0.18);
  --card: #0b1729;
  --card-strong: #101d33;
  --primary-soft: rgba(13, 183, 237, 0.14);
  --mint-soft: rgba(16, 185, 129, 0.16);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.28);
  --shadow: 0 12px 28px rgba(0, 0, 0, 0.28);
  --shadow-lg: 0 20px 44px rgba(0, 0, 0, 0.34);
}

html[data-theme="dark"] body {
  background:
    radial-gradient(circle at top right, rgba(13, 183, 237, 0.1), transparent 24%),
    linear-gradient(180deg, #050d18 0%, #07111f 100%);
}

html[data-theme="dark"] .topbar,
html[data-theme="dark"] .sidebar,
html[data-theme="dark"] .hero,
html[data-theme="dark"] .panel,
html[data-theme="dark"] .card,
html[data-theme="dark"] .feature-card,
html[data-theme="dark"] .diagram-card,
html[data-theme="dark"] .footer-card,
html[data-theme="dark"] .hero-orbit,
html[data-theme="dark"] .orbit-node,
html[data-theme="dark"] .caption-pill,
html[data-theme="dark"] .flow-step,
html[data-theme="dark"] .mini-stack div,
html[data-theme="dark"] .build-chain div,
html[data-theme="dark"] .lifecycle div,
html[data-theme="dark"] .layer,
html[data-theme="dark"] .compare-card,
html[data-theme="dark"] .diagram-box,
html[data-theme="dark"] .lms-modal-card,
html[data-theme="dark"] .lms-celebration-card,
html[data-theme="dark"] .lms-tracker-metric,
html[data-theme="dark"] .lms-input,
html[data-theme="dark"] .lms-notes-area,
html[data-theme="dark"] .lms-meta-pill,
html[data-theme="dark"] .lms-study-chip {
  background: var(--card);
  border-color: var(--line);
  color: var(--ink);
}

html[data-theme="dark"] .progress-card,
html[data-theme="dark"] .hero-visual,
html[data-theme="dark"] .diagram-card,
html[data-theme="dark"] .stat,
html[data-theme="dark"] .lms-tracker-card,
html[data-theme="dark"] .lms-sidebar-utilities,
html[data-theme="dark"] .lms-dashboard,
html[data-theme="dark"] .lms-quiz-item,
html[data-theme="dark"] .lms-quiz-option,
html[data-theme="dark"] .lms-certificate-meta div,
html[data-theme="dark"] .lms-chip-button {
  background: rgba(11, 23, 41, 0.92);
  border-color: var(--line);
}

html[data-theme="dark"] .button-secondary {
  background: transparent;
  color: var(--ink);
}

html[data-theme="dark"] .button-secondary:hover,
html[data-theme="dark"] .lms-chip-button:hover {
  border-color: rgba(13, 183, 237, 0.45);
  color: #c7f0ff;
}

html[data-theme="dark"] .lms-mobile-nav-button,
html[data-theme="dark"] .lms-sidebar-close {
  background: rgba(11, 23, 41, 0.92);
  border-color: var(--line);
  color: var(--ink);
}

html[data-theme="dark"] .terminal,
html[data-theme="dark"] .code-box {
  background: #020817;
  border-color: #162235;
  color: #d8e5f6;
}

html[data-theme="dark"] p code,
html[data-theme="dark"] li code,
html[data-theme="dark"] h3 code {
  background: rgba(13, 183, 237, 0.16);
  color: #8fe8ff;
}

html[data-theme="dark"] .callout {
  background: rgba(16, 185, 129, 0.12);
  color: #d8fff1;
}

html[data-theme="dark"] .callout strong {
  color: #b5f6dd;
}

html[data-theme="dark"] .lms-badge-banner {
  background: rgba(16, 185, 129, 0.16);
  border-color: rgba(16, 185, 129, 0.24);
  color: #b9ffe7;
}

html[data-theme="dark"] .lms-badge-banner-soft {
  background: rgba(13, 183, 237, 0.12);
  border-color: rgba(13, 183, 237, 0.22);
  color: #9ce7ff;
}

html[data-theme="dark"] .lms-quiz-feedback.correct {
  color: #7ef0c7;
}

html[data-theme="dark"] .lms-quiz-feedback.incorrect {
  color: #ff9f9f;
}

html[data-theme="dark"] .lms-quiz-feedback.warning {
  color: #ffd36b;
}

html[data-theme="dark"] .lms-certificate {
  background:
    radial-gradient(circle at top right, rgba(13, 183, 237, 0.16), transparent 26%),
    linear-gradient(180deg, rgba(13, 183, 237, 0.07), rgba(16, 185, 129, 0.08)),
    #081425;
  border-color: rgba(13, 183, 237, 0.22);
}

html[data-theme="dark"] .lms-certificate-badge {
  background: rgba(16, 185, 129, 0.18);
  border-color: rgba(16, 185, 129, 0.32);
  color: #b9ffe7;
}

html[data-theme="dark"] .lms-text-button,
html[data-theme="dark"] .visual-label,
html[data-theme="dark"] .sidebar-link.active strong,
html[data-theme="dark"] .tag,
html[data-theme="dark"] .eyebrow,
html[data-theme="dark"] .pill,
html[data-theme="dark"] .lms-phase-pill {
  color: #9ce7ff;
}

html[data-theme="dark"] .sidebar-link.active,
html[data-theme="dark"] .sidebar-link.completed,
html[data-theme="dark"] .tag,
html[data-theme="dark"] .eyebrow,
html[data-theme="dark"] .pill,
html[data-theme="dark"] .lms-phase-pill,
html[data-theme="dark"] .brand-mark {
  background: rgba(13, 183, 237, 0.12);
}

html[data-theme="dark"] .sidebar-link.completed {
  border-color: rgba(16, 185, 129, 0.28);
  background: rgba(16, 185, 129, 0.1);
}

html[data-theme="dark"] .orbit-ring {
  border-color: rgba(13, 183, 237, 0.28);
}

@media (max-width: 960px) {
  .lms-topbar-actions,
  .lms-tracker-actions,
  .lms-dashboard-actions,
  .lms-quick-tools,
  .lms-modal-actions,
  .lms-celebration-actions,
  .progress-inline,
  .lms-tracker-metrics {
    grid-template-columns: 1fr;
    flex-direction: column;
    align-items: stretch;
  }

  .lms-topbar-actions {
    width: 100%;
    margin-left: 0;
  }

  .hero-actions .button,
  .lms-tracker-actions .button,
  .lms-dashboard-actions .button,
  .lms-quick-tools .button,
  .lms-certificate-actions .button {
    width: 100%;
  }

  .progress-step {
    grid-template-columns: 10px 1fr;
  }

  .progress-step strong {
    justify-self: start;
  }

  .lms-tracker-metrics {
    display: grid;
  }

  .lms-certificate-meta {
    grid-template-columns: 1fr;
  }
}

@media print {
  body {
    background: #fff !important;
  }

  .topbar,
  .sidebar,
  .page-end,
  .lms-dashboard,
  .lms-tracker-card,
  .lms-sidebar-utilities {
    display: none !important;
  }

  .layout,
  .content {
    display: block;
  }

  .site {
    width: 100%;
    margin: 0;
    padding: 0;
  }

  .panel {
    border: none;
    box-shadow: none;
    padding: 0;
  }

  .section-head {
    display: none;
  }

  .lms-certificate {
    margin: 0;
    box-shadow: none;
    border-color: rgba(0, 0, 0, 0.12);
  }
}