:root {
  color-scheme: dark;
  --ink: #f6f0e6;
  --muted: #b7c2bb;
  --line: rgba(246, 240, 230, 0.18);
  --panel: rgba(17, 24, 27, 0.72);
  --panel-strong: rgba(22, 32, 35, 0.9);
  --accent: #8fd7c7;
  --accent-2: #e3bb6a;
  --danger: #f0968d;
  --bg: #071012;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(circle at 50% 10%, rgba(36, 74, 73, 0.52), transparent 42%), var(--bg);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  letter-spacing: 0;
}

#learning-field {
  position: fixed;
  inset: 0;
  z-index: -1;
  width: 100%;
  height: 100%;
  background: #071012;
}

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

.topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px clamp(18px, 5vw, 64px);
  background: linear-gradient(to bottom, rgba(7, 16, 18, 0.88), rgba(7, 16, 18, 0.12));
  backdrop-filter: blur(12px);
}

.brand,
nav {
  display: flex;
  align-items: center;
}

.brand {
  gap: 10px;
  font-weight: 760;
}

.brand-mark {
  width: 14px;
  height: 14px;
  border: 2px solid var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 0 5px rgba(143, 215, 199, 0.12);
}

nav {
  gap: clamp(12px, 3vw, 34px);
  color: var(--muted);
  font-size: 0.94rem;
}

nav a:hover {
  color: var(--ink);
}

.hero {
  min-height: 92vh;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 420px);
  align-items: center;
  gap: clamp(28px, 5vw, 72px);
  padding: 120px clamp(18px, 5vw, 64px) 48px;
}

.hero-copy {
  max-width: 780px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 760;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 18px;
  font-size: clamp(4.2rem, 13vw, 11rem);
  line-height: 0.86;
  letter-spacing: 0;
}

.lede {
  max-width: 700px;
  color: #dce5dc;
  font-size: clamp(1.1rem, 2vw, 1.6rem);
  line-height: 1.45;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.button {
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 18px;
  font-weight: 720;
}

.button.primary {
  background: var(--ink);
  color: #071012;
}

.button.secondary {
  background: rgba(246, 240, 230, 0.08);
}

.hero-panel {
  display: grid;
  gap: 1px;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  background: var(--line);
}

.metric,
.status-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  background: var(--panel);
  padding: 18px;
}

.metric span,
.status-row span {
  color: var(--muted);
}

.metric strong,
.status-row strong {
  text-align: right;
}

.ok {
  color: var(--accent);
}

.off {
  color: var(--danger);
}

.band,
.ops {
  padding: 70px clamp(18px, 5vw, 64px);
  background: rgba(7, 16, 18, 0.84);
  border-top: 1px solid var(--line);
}

.section-head {
  max-width: 760px;
  margin-bottom: 28px;
}

h2 {
  margin-bottom: 0;
  font-size: clamp(2rem, 5vw, 4rem);
  line-height: 1;
}

.layer-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(160px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
}

.layer-grid article {
  min-height: 230px;
  padding: 22px;
  background: var(--panel-strong);
}

.layer-grid article span {
  color: var(--accent-2);
  font-weight: 800;
  font-size: 0.82rem;
}

.layer-grid h3 {
  margin: 18px 0 12px;
  font-size: 1.08rem;
}

.feature-grid {
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

.feature-grid article {
  min-height: 200px;
}

.layer-grid p {
  color: var(--muted);
  line-height: 1.5;
}

.ops-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
}

.improvement-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(220px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
}

.improvement-grid article {
  min-height: 200px;
  padding: 22px;
  background: var(--panel-strong);
}

.improvement-grid .icon {
  display: block;
  font-size: 1.6rem;
  margin-bottom: 8px;
  color: var(--accent-2);
}

.improvement-grid h3 {
  margin: 8px 0 12px;
  font-size: 1.08rem;
}

.improvement-grid p {
  color: var(--muted);
  line-height: 1.5;
  font-size: 0.92rem;
}

@media (max-width: 980px) {
  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
  }

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

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

@media (max-width: 640px) {
  .topbar {
    position: absolute;
    align-items: flex-start;
  }

  nav {
    flex-wrap: wrap;
    justify-content: flex-end;
    font-size: 0.84rem;
  }

  .hero {
    padding-top: 112px;
  }

  .layer-grid,
  .ops-grid,
  .improvement-grid {
    grid-template-columns: 1fr;
  }

  .metric,
  .status-row {
    align-items: flex-start;
    flex-direction: column;
  }

  .metric strong,
  .status-row strong {
    text-align: left;
  }
}

/* Role switcher */
.role-switch {
  position: relative;
  display: inline-block;
}
.role-switch > a {
  font-size: 0.82rem;
  font-weight: 600;
  padding: 4px 8px;
  border-radius: 4px;
  background: rgba(143,215,199,0.1);
  color: var(--accent);
}
.role-dropdown {
  display: none;
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: 4px;
  background: var(--panel-strong);
  border: 1px solid var(--line);
  border-radius: 6px;
  min-width: 110px;
  z-index: 100;
  box-shadow: 0 4px 16px rgba(0,0,0,0.3);
  overflow: hidden;
}
.role-dropdown.open { display: block; }
.role-dropdown a {
  display: block;
  padding: 8px 14px;
  font-size: 0.85rem;
  color: var(--ink);
  text-decoration: none;
  transition: background 0.15s;
}
.role-dropdown a:hover { background: rgba(143,215,199,0.08); }
.role-dropdown a.active {
  color: var(--accent);
  font-weight: 600;
  background: rgba(143,215,199,0.06);
}

/* Nav category dropdowns (admin menu grouping) */
.nav-group {
  position: relative;
  display: inline-block;
}
.nav-group-btn {
  cursor: pointer;
  white-space: nowrap;
}
.nav-dropdown {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  margin-top: 6px;
  background: var(--panel-strong);
  border: 1px solid var(--line);
  border-radius: 6px;
  min-width: 150px;
  z-index: 100;
  box-shadow: 0 4px 16px rgba(0,0,0,0.3);
  overflow: hidden;
}
.nav-dropdown.open { display: block; }
.nav-dropdown a {
  display: block;
  padding: 8px 14px;
  font-size: 0.85rem;
  color: var(--ink);
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.15s;
}
.nav-dropdown a:hover { background: rgba(143,215,199,0.08); }
.nav-dropdown a.active {
  color: var(--accent);
  font-weight: 600;
  background: rgba(143,215,199,0.06);
}