:root {
  --bg: #f7f9fc;
  --surface: #ffffff;
  --surface-soft: #eef6fb;
  --text: #172033;
  --muted: #5d6b82;
  --border: #dde6f0;
  --teal: #00a6a6;
  --blue: #2563eb;
  --purple: #7c3aed;
  --orange: #f59e0b;
  --green: #16a34a;
  --shadow: 0 18px 42px rgba(21, 32, 55, 0.11);
  --shadow-soft: 0 10px 24px rgba(21, 32, 55, 0.08);
  --max: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 5% 5%, rgba(0, 166, 166, 0.12), transparent 28%),
    radial-gradient(circle at 90% 10%, rgba(124, 58, 237, 0.10), transparent 26%),
    var(--bg);
  line-height: 1.56;
}
a { color: inherit; text-decoration: none; }
button { font: inherit; }

.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(18px);
}
.nav-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 14px 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 850; }
.mark {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--teal), var(--blue), var(--purple), var(--orange));
  box-shadow: 0 10px 24px rgba(37, 99, 235, 0.24);
}
.nav-actions { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.language-switcher {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  padding: 3px;
  box-shadow: var(--shadow-soft);
}
.lang-btn {
  width: 34px;
  height: 30px;
  border: 0;
  border-radius: 999px;
  background: transparent;
  cursor: pointer;
  display: grid;
  place-items: center;
  font-size: 1rem;
}
.lang-btn.active {
  background: color-mix(in srgb, var(--blue) 13%, var(--surface));
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--blue) 35%, var(--border));
}
.pill-link,
.nav-btn {
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--muted);
  padding: 8px 12px;
  font-size: 0.84rem;
  font-weight: 800;
  box-shadow: var(--shadow-soft);
}
.nav-btn { cursor: pointer; }

.hero {
  max-width: var(--max);
  margin: 0 auto;
  padding: 62px 22px 32px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 0.48fr);
  gap: 34px;
  align-items: stretch;
}
.eyebrow {
  display: inline-flex;
  width: fit-content;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--muted);
  padding: 8px 12px;
  font-size: 0.86rem;
  font-weight: 800;
  box-shadow: var(--shadow-soft);
}
h1, h2, h3, p { margin-top: 0; }
h1 {
  margin: 18px 0 16px;
  max-width: 820px;
  font-size: clamp(2.35rem, 5vw, 4.8rem);
  line-height: 1;
  letter-spacing: 0;
}
.hero p { color: var(--muted); max-width: 790px; font-size: 1.04rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  border: 0;
  border-radius: 999px;
  padding: 10px 15px;
  color: #ffffff;
  background: linear-gradient(135deg, var(--teal), var(--blue));
  font-weight: 850;
  cursor: pointer;
}
.btn.secondary {
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
}
.summary-card {
  border: 1px solid var(--border);
  border-radius: 24px;
  background: var(--surface);
  box-shadow: var(--shadow);
  padding: 22px;
  display: grid;
  gap: 12px;
}
.summary-stat {
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 14px;
  background: color-mix(in srgb, var(--surface-soft) 45%, var(--surface));
}
.summary-stat strong { display: block; color: var(--blue); font-size: 1.35rem; }
.summary-stat span { color: var(--muted); font-size: 0.84rem; font-weight: 750; }

.section {
  max-width: var(--max);
  margin: 0 auto;
  padding: 34px 22px;
}
.section h2 {
  font-size: clamp(1.65rem, 3vw, 2.45rem);
  line-height: 1.1;
  margin-bottom: 12px;
}
.grid { display: grid; gap: 16px; }
.two { grid-template-columns: 1fr 1fr; }
.three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.card {
  border: 1px solid var(--border);
  border-radius: 20px;
  background: var(--surface);
  box-shadow: var(--shadow-soft);
  padding: 20px;
}
.card p, .card li { color: var(--muted); }
.card a {
  color: var(--blue);
  font-weight: 750;
  overflow-wrap: anywhere;
}
.reference-list li + li {
  margin-top: 8px;
}
.reference-list span {
  display: block;
  color: var(--muted);
  font-size: 0.8rem;
  margin-top: 2px;
}
.badge {
  display: inline-flex;
  width: fit-content;
  border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--teal) 28%, var(--border));
  background: color-mix(in srgb, var(--teal) 13%, var(--surface));
  padding: 6px 9px;
  font-size: 0.75rem;
  font-weight: 900;
}
.badge.Analytics { border-color: color-mix(in srgb, var(--blue) 28%, var(--border)); background: color-mix(in srgb, var(--blue) 13%, var(--surface)); }
.badge.AI { border-color: color-mix(in srgb, var(--purple) 28%, var(--border)); background: color-mix(in srgb, var(--purple) 13%, var(--surface)); }
.badge.Governance { border-color: color-mix(in srgb, var(--orange) 30%, var(--border)); background: color-mix(in srgb, var(--orange) 15%, var(--surface)); }
.badge.Enterprise { border-color: color-mix(in srgb, var(--green) 28%, var(--border)); background: color-mix(in srgb, var(--green) 13%, var(--surface)); }

.flow {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 10px;
}
.flow span {
  min-height: 90px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: linear-gradient(180deg, color-mix(in srgb, var(--surface-soft) 56%, var(--surface)), var(--surface));
  display: grid;
  place-items: center;
  text-align: center;
  padding: 12px;
  color: var(--text);
  font-size: 0.86rem;
  font-weight: 850;
}

.visual-board {
  border: 1px solid var(--border);
  border-radius: 24px;
  background: var(--surface);
  box-shadow: var(--shadow);
  padding: clamp(18px, 3vw, 26px);
  display: grid;
  gap: 18px;
}
.visual-board h3 {
  margin: 0;
  font-size: 1.05rem;
}
.visual-board p {
  color: var(--muted);
  margin: 0;
}
.architecture-canvas {
  display: grid;
  grid-template-columns: 1fr auto 1.1fr auto 1fr;
  gap: 12px;
  align-items: stretch;
}
.canvas-node {
  border: 1px solid var(--border);
  border-radius: 18px;
  background: linear-gradient(180deg, color-mix(in srgb, var(--surface-soft) 58%, var(--surface)), var(--surface));
  padding: 16px;
  display: grid;
  align-content: start;
  gap: 8px;
  min-height: 152px;
}
.canvas-node strong {
  color: var(--text);
  font-size: 0.95rem;
}
.canvas-node span {
  color: var(--muted);
  font-size: 0.84rem;
}
.canvas-node.primary {
  background:
    linear-gradient(135deg, rgba(0, 166, 166, 0.1), rgba(37, 99, 235, 0.1), rgba(124, 58, 237, 0.1)),
    var(--surface);
  border-color: color-mix(in srgb, var(--blue) 36%, var(--border));
}
.canvas-arrow {
  display: grid;
  place-items: center;
  color: var(--blue);
  font-weight: 900;
}
.concept-map {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}
.concept-tile {
  min-height: 104px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: color-mix(in srgb, var(--surface-soft) 44%, var(--surface));
  padding: 14px;
}
.concept-tile strong {
  display: block;
  margin-bottom: 6px;
}
.concept-tile span {
  color: var(--muted);
  font-size: 0.83rem;
}
.decision-canvas {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}
.decision-tile {
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--surface);
  padding: 14px;
}
.decision-tile strong {
  display: block;
  color: var(--blue);
  margin-bottom: 6px;
}
.decision-tile span {
  color: var(--muted);
  font-size: 0.84rem;
}
.bi-architecture {
  border: 1px solid var(--border);
  border-radius: 24px;
  background:
    linear-gradient(135deg, rgba(0, 166, 166, 0.08), rgba(37, 99, 235, 0.08), rgba(245, 158, 11, 0.05)),
    var(--surface);
  box-shadow: var(--shadow);
  padding: clamp(18px, 3vw, 28px);
  display: grid;
  gap: 18px;
}
.bi-architecture.hidden {
  display: none;
}
.bi-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.bi-head p {
  max-width: 760px;
  color: var(--muted);
  margin: 6px 0 0;
}
.bi-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.78fr 1.35fr 1fr 1fr 0.85fr;
  gap: 10px;
  align-items: stretch;
}
.bi-column {
  border: 1px solid var(--border);
  border-radius: 18px;
  background: color-mix(in srgb, var(--surface) 88%, var(--surface-soft));
  padding: 12px;
  display: grid;
  gap: 9px;
  align-content: start;
}
.bi-column h4 {
  margin: 0;
  font-size: 0.85rem;
  text-transform: uppercase;
  color: var(--muted);
  letter-spacing: 0.05em;
}
.bi-chip {
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface);
  padding: 10px;
  display: grid;
  gap: 4px;
  min-height: 76px;
}
.bi-chip strong {
  color: var(--text);
  font-size: 0.84rem;
}
.bi-chip span {
  color: var(--muted);
  font-size: 0.76rem;
  line-height: 1.32;
}
.bi-chip.accent {
  border-color: color-mix(in srgb, var(--teal) 42%, var(--border));
  background: color-mix(in srgb, var(--teal) 9%, var(--surface));
}
.bi-chip.power {
  border-color: color-mix(in srgb, var(--orange) 42%, var(--border));
  background: color-mix(in srgb, var(--orange) 10%, var(--surface));
}
.bi-arrow-row {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 10px;
  color: var(--blue);
  font-weight: 900;
  text-align: center;
  margin: -2px 0;
}
.bi-governance,
.bi-platform {
  border: 1px solid var(--border);
  border-radius: 16px;
  background: color-mix(in srgb, var(--surface-soft) 52%, var(--surface));
  padding: 12px;
}
.bi-governance strong,
.bi-platform strong {
  display: block;
  margin-bottom: 8px;
}
.bi-band {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.bi-band span {
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--muted);
  padding: 6px 9px;
  font-size: 0.78rem;
  font-weight: 750;
}

.concepts {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.concepts li {
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface-soft);
  color: var(--muted);
  padding: 7px 10px;
  font-size: 0.86rem;
  font-weight: 750;
}
.lesson-plan { counter-reset: step; }
.lesson-step { counter-increment: step; position: relative; padding-left: 58px; }
.lesson-step::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 18px;
  top: 20px;
  width: 30px;
  height: 30px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  color: #ffffff;
  background: var(--blue);
  font-size: 0.76rem;
  font-weight: 900;
}
.quiz-card { display: grid; gap: 10px; }
.quiz-options { display: grid; gap: 8px; }
.quiz-option {
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  padding: 10px 12px;
  text-align: left;
  cursor: pointer;
  color: var(--text);
}
.quiz-option.correct { border-color: color-mix(in srgb, var(--green) 55%, var(--border)); background: color-mix(in srgb, var(--green) 12%, var(--surface)); }
.quiz-option.wrong { border-color: color-mix(in srgb, #dc2626 48%, var(--border)); background: color-mix(in srgb, #dc2626 10%, var(--surface)); }
.feedback { color: var(--muted); font-size: 0.9rem; min-height: 20px; }
.assignment-box {
  border: 1px solid color-mix(in srgb, var(--orange) 32%, var(--border));
  background: color-mix(in srgb, var(--orange) 9%, var(--surface));
}
.pager {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}
footer {
  max-width: var(--max);
  margin: 0 auto;
  padding: 30px 22px 46px;
  color: var(--muted);
  text-align: center;
}

@media (max-width: 980px) {
  .hero, .two, .three { grid-template-columns: 1fr; }
  .flow { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .architecture-canvas { grid-template-columns: 1fr; }
  .canvas-arrow { min-height: 24px; }
  .concept-map, .decision-canvas { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .bi-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .bi-arrow-row { display: none; }
}
@media (max-width: 620px) {
  .nav-inner { align-items: flex-start; flex-direction: column; }
  .hero { padding-top: 42px; }
  .flow { grid-template-columns: 1fr; }
  .concept-map, .decision-canvas { grid-template-columns: 1fr; }
  .bi-grid { grid-template-columns: 1fr; }
  .lesson-step { padding-left: 20px; }
  .lesson-step::before { position: static; margin-bottom: 10px; }
}