:root {
  color-scheme: dark;
  --bg: #0d1117;
  --surface: #151b23;
  --surface-2: #1d2530;
  --surface-3: #263241;
  --line: #354252;
  --text: #f4f7fb;
  --muted: #aab7c7;
  --blue: #5bb7ff;
  --green: #42d392;
  --amber: #f2c94c;
  --violet: #a78bfa;
  --red: #ff7373;
  --shadow: 0 22px 54px rgba(0, 0, 0, .32);
  --radius: 8px;
  --content: 1180px;
  font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background:
    linear-gradient(180deg, rgba(91, 183, 255, .08), transparent 300px),
    linear-gradient(90deg, rgba(255,255,255,.025) 1px, transparent 1px),
    linear-gradient(0deg, rgba(255,255,255,.025) 1px, transparent 1px),
    var(--bg);
  background-size: auto, 28px 28px, 28px 28px, auto;
}

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

button,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

img {
  display: block;
  max-width: 100%;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  border-bottom: 1px solid var(--line);
  background: rgba(13, 17, 23, .92);
  backdrop-filter: blur(14px);
}

.topbar-inner,
.page-inner,
.footer-inner {
  width: min(calc(100% - 32px), var(--content));
  margin: 0 auto;
}

.topbar-inner {
  min-height: 74px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 220px;
}

.brand-mark {
  width: 46px;
  height: 46px;
  border-radius: 12px;
  background: var(--surface-2);
  object-fit: cover;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.16), 0 10px 24px rgba(0, 0, 0, .24);
  flex: 0 0 auto;
}

.brand h1 {
  margin: 0;
  font-family: "Sora", "IBM Plex Sans", sans-serif;
  font-size: 18px;
  line-height: 1.05;
}

.brand p {
  margin: 3px 0 0;
  color: var(--muted);
  font-size: 12px;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  flex-wrap: wrap;
}

.nav a,
.button,
.option-btn,
.level-btn {
  min-height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-2);
  color: var(--text);
  font-weight: 700;
  transition: border-color .18s ease, background .18s ease, transform .18s ease;
}

.nav a {
  padding: 8px 11px;
  font-size: 13px;
}

.button {
  padding: 9px 13px;
  gap: 8px;
}

.nav a:hover,
.nav a.active,
.button:hover,
.option-btn:hover,
.level-btn:hover,
.level-btn.active {
  border-color: var(--blue);
  background: color-mix(in srgb, var(--surface-2) 78%, var(--blue));
}

.button.primary,
.nav a.primary {
  border-color: color-mix(in srgb, var(--green) 50%, var(--line));
  background: color-mix(in srgb, var(--green) 24%, var(--surface-2));
}

.page {
  min-height: calc(100vh - 132px);
}

.page-inner {
  padding: 34px 0;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 420px;
  gap: 18px;
  align-items: stretch;
}

.panel,
.card,
.sim-frame {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--surface) 94%, transparent);
  box-shadow: var(--shadow);
}

.panel {
  padding: 24px;
}

.eyebrow,
.section-tag {
  color: var(--green);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .04em;
  text-transform: uppercase;
}

h2,
h3,
p {
  margin-top: 0;
}

.hero h2,
.page-head h2 {
  margin: 8px 0 14px;
  font-family: "Sora", "IBM Plex Sans", sans-serif;
  font-size: clamp(32px, 5vw, 58px);
  line-height: 1.02;
  letter-spacing: 0;
}

.page-head h2 {
  font-size: clamp(28px, 4vw, 44px);
}

.lead,
.page-head p,
.card p,
.empty-copy {
  color: var(--muted);
  line-height: 1.62;
}

.hero-actions,
.card-actions,
.search-row,
.quiz-controls,
.chip-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
}

.hero-actions {
  margin-top: 18px;
}

.service-grid,
.library-grid,
.learning-grid,
.decision-grid,
.state-grid {
  display: grid;
  gap: 14px;
}

.service-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 18px;
}

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

.learning-grid,
.decision-grid,
.state-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.learning-card .equipment-thumb {
  height: 120px;
}

.learning-card .card-actions {
  margin-top: 14px;
}

.card {
  padding: 16px;
  min-width: 0;
  overflow: hidden;
}

.card h3 {
  margin: 12px 0 8px;
  font-family: "Sora", "IBM Plex Sans", sans-serif;
  font-size: 19px;
}

.card-top {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  align-items: center;
}

.badge,
.chip {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px 8px;
  font-size: 12px;
  color: var(--muted);
  background: var(--surface-2);
}

.badge.live {
  color: #07150d;
  border-color: transparent;
  background: var(--green);
  font-weight: 800;
}

.badge.next,
.badge.plan {
  color: var(--text);
  border-color: color-mix(in srgb, var(--amber) 60%, var(--line));
  background: color-mix(in srgb, var(--amber) 15%, var(--surface-2));
}

.equipment-card.hidden {
  display: none;
}

.equipment-thumb {
  height: 132px;
  margin: -16px -16px 14px;
  border-bottom: 1px solid var(--line);
  background: var(--surface-3);
  overflow: hidden;
  display: grid;
  place-items: center;
}

.equipment-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.device-visual {
  width: 74%;
  height: 72%;
  border: 2px solid color-mix(in srgb, var(--blue) 48%, var(--line));
  border-radius: 8px;
  background:
    linear-gradient(90deg, transparent 46%, rgba(255,255,255,.12) 47% 53%, transparent 54%),
    radial-gradient(circle at 24% 30%, var(--green) 0 7px, transparent 8px),
    radial-gradient(circle at 40% 30%, var(--amber) 0 7px, transparent 8px),
    radial-gradient(circle at 56% 30%, var(--blue) 0 7px, transparent 8px),
    var(--surface-2);
  position: relative;
}

.device-visual::after {
  content: "";
  position: absolute;
  left: 18%;
  right: 18%;
  bottom: 18%;
  height: 14px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--green) 50%, var(--surface-3));
}

.page-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 18px;
}

.search-row input {
  min-height: 42px;
  width: min(100%, 360px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 9px 12px;
  background: var(--surface-2);
  color: var(--text);
}

.quiz-shell {
  grid-column: span 2;
}

.question-box {
  margin-top: 12px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-2);
}

.options {
  display: grid;
  gap: 8px;
  margin: 12px 0;
}

.option-btn {
  justify-content: flex-start;
  padding: 10px 12px;
  text-align: left;
}

.option-btn.correct {
  border-color: var(--green);
  background: color-mix(in srgb, var(--green) 24%, var(--surface-2));
}

.option-btn.wrong {
  border-color: var(--red);
  background: color-mix(in srgb, var(--red) 20%, var(--surface-2));
}

.feedback {
  min-height: 24px;
  color: var(--muted);
}

.sim-frame {
  overflow: hidden;
}

.sim-frame-top {
  padding: 14px;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  border-bottom: 1px solid var(--line);
}

.sim-frame iframe {
  width: 100%;
  height: 650px;
  border: 0;
  display: block;
}

.home-preview {
  min-height: 100%;
  display: grid;
  grid-template-rows: auto 1fr;
  overflow: hidden;
}

.home-preview img {
  width: 100%;
  height: 100%;
  min-height: 330px;
  object-fit: cover;
}

.footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
}

.footer-inner {
  padding: 18px 0;
}

@media (max-width: 980px) {
  .topbar-inner,
  .page-head,
  .hero {
    align-items: stretch;
    flex-direction: column;
    display: flex;
  }

  .nav {
    justify-content: flex-start;
  }

  .library-grid,
  .learning-grid,
  .decision-grid,
  .state-grid,
  .service-grid {
    grid-template-columns: 1fr;
  }

  .quiz-shell {
    grid-column: auto;
  }
}