:root {
  --bg: #070b16;
  --panel: #0d162b;
  --panel-2: #121f3a;
  --text: #e9eef9;
  --muted: #a6b3cd;
  --line: #24395f;
  --accent: #40c7b8;
  --accent-2: #7fb7ff;
  --warn-bg: #62240f;
  --warn-line: #dc7b31;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  background: radial-gradient(1200px 700px at 20% -10%, #172c54 0%, var(--bg) 55%);
  color: var(--text);
  font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
  scroll-behavior: smooth;
}

a {
  color: var(--accent-2);
}

code, pre {
  font-family: "IBM Plex Mono", monospace;
}

.bg-orb {
  position: fixed;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  filter: blur(70px);
  z-index: -1;
  opacity: 0.2;
}

.orb-a {
  background: #4fd1c5;
  top: -120px;
  left: -120px;
  animation: driftA 16s ease-in-out infinite;
}

.orb-b {
  background: #63b3ed;
  bottom: -120px;
  right: -120px;
  animation: driftB 20s ease-in-out infinite;
}

@keyframes driftA {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(60px, 30px); }
}

@keyframes driftB {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(-50px, -35px); }
}

.hero {
  max-width: 1240px;
  margin: 0 auto;
  padding: 56px 28px 28px;
}

.eyebrow {
  display: inline-block;
  margin: 0 0 12px;
  padding: 6px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  font-size: clamp(30px, 4vw, 52px);
  line-height: 1.1;
}

.subtitle {
  margin-top: 16px;
  color: var(--muted);
  max-width: 950px;
  font-size: 18px;
}

.hero-grid {
  margin-top: 24px;
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.hero-grid article {
  background: linear-gradient(145deg, var(--panel), #0a1326);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px;
}

.hero-grid h3 {
  margin: 0 0 8px;
  font-size: 14px;
  color: var(--muted);
}

.hero-grid p {
  margin: 0;
  font-weight: 600;
}

.layout {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 28px 40px;
  display: grid;
  gap: 18px;
  grid-template-columns: 280px minmax(0, 1fr);
}

.toc {
  position: sticky;
  top: 14px;
  align-self: start;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel);
}

.toc h2 {
  margin: 0 0 10px;
  font-size: 17px;
}

.toc a {
  display: block;
  text-decoration: none;
  color: var(--muted);
  padding: 7px 0;
  border-bottom: 1px dashed rgba(127, 183, 255, 0.16);
}

.toc a:hover {
  color: var(--text);
}

.content {
  min-width: 0;
}

.panel {
  background: linear-gradient(160deg, var(--panel) 0%, var(--panel-2) 100%);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 20px;
  margin-bottom: 16px;
}

.panel h2 {
  margin-top: 0;
  font-size: 24px;
}

.panel p,
.panel li {
  line-height: 1.7;
}

.kpi-grid {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 14px;
}

.kpi-grid div {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px;
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.kpi-grid span {
  color: var(--muted);
  font-size: 14px;
}

.diagram {
  overflow-x: auto;
  background: #071022;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px;
}

pre {
  overflow-x: auto;
  background: #071022;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

thead th {
  text-align: left;
  color: var(--muted);
  font-weight: 600;
  border-bottom: 1px solid var(--line);
  padding-bottom: 8px;
}

td {
  border-bottom: 1px solid rgba(127, 183, 255, 0.16);
  padding: 10px 4px;
  vertical-align: top;
}

.footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 420ms ease, transform 420ms ease;
}

.reveal.show {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 1050px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .toc {
    position: relative;
    top: 0;
  }

  .hero-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .hero {
    padding: 36px 18px 18px;
  }

  .layout {
    padding: 0 18px 30px;
  }

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

  .footer {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
}