:root {
  --edge-bg: #12161A; --edge-surface: #151B25; --edge-primary: #30ADE8;
  --edge-accent: #4B8FFA; --edge-text: #E8EDF4; --edge-border: #1B252F;
  --edge-gradient: linear-gradient(110deg, #30ADE8 0%, #4B8FFA 100%);

  /* Derived tokens (contrast checked for WCAG AA on bg/surface). */
  --edge-surface-2: #1B2432;
  --edge-border-strong: #5A6B7D;
  --edge-muted: #9AA7B8;
  --edge-on-primary: #12161A;
  --edge-danger: #FF8A8A;
  --edge-danger-bg: #2A1719;
  --edge-success: #6FD99A;
  --edge-success-bg: #12261B;
}

*, *::before, *::after { box-sizing: border-box; }
html { color-scheme: dark; }
body {
  margin: 0;
  background: var(--edge-bg);
  color: var(--edge-text);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
a { color: var(--edge-primary); }
h1 { font-size: 1.6rem; margin: 0; }
:focus-visible { outline: 2px solid var(--edge-primary); outline-offset: 2px; }

.skip {
  position: absolute; left: -999px; top: 0; z-index: 10;
  padding: .5rem 1rem; background: var(--edge-surface); color: var(--edge-text);
}
.skip:focus { left: 0; }
.sr-only {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0, 0, 0, 0); white-space: nowrap;
}
.muted { color: var(--edge-muted); }

/* Layout */
.app { display: grid; grid-template-columns: 15rem 1fr; min-height: 100vh; }
.sidebar {
  display: flex; flex-direction: column; gap: 1.5rem;
  padding: 1.25rem 1rem;
  background: var(--edge-surface);
  border-right: 1px solid var(--edge-border);
}
.brand {
  font-weight: 700; font-size: 1.25rem; letter-spacing: .02em;
  color: var(--edge-text); text-decoration: none;
}
.brand span { color: var(--edge-primary); }
.brand-lg { font-size: 1.6rem; display: block; margin-bottom: .25rem; }
.nav { display: flex; flex-direction: column; gap: .25rem; flex: 1; }
.nav-link {
  display: block; padding: .6rem .8rem; border-radius: 8px;
  color: var(--edge-text); text-decoration: none;
}
.nav-link:hover { background: var(--edge-surface-2); }
.nav-link.active {
  background: var(--edge-gradient); color: var(--edge-on-primary); font-weight: 600;
}
.sidebar-foot { display: flex; flex-direction: column; gap: .75rem; }
.who { margin: 0; overflow-wrap: anywhere; }
.who small { color: var(--edge-muted); }
.content { padding: 2rem; width: 100%; max-width: 72rem; }

@media (max-width: 48rem) {
  .app { grid-template-columns: 1fr; }
  .sidebar {
    flex-direction: row; flex-wrap: wrap; align-items: center; gap: .75rem 1rem;
    border-right: 0; border-bottom: 1px solid var(--edge-border);
  }
  .nav { flex-direction: row; flex-wrap: wrap; flex: 1 1 auto; }
  .sidebar-foot { flex-direction: row; align-items: center; }
  .content { padding: 1rem; }
}

/* Components */
.card {
  background: var(--edge-surface);
  border: 1px solid var(--edge-border);
  border-radius: 12px;
  padding: 1.5rem;
}
.page-head {
  display: flex; justify-content: space-between; align-items: center;
  gap: 1rem; flex-wrap: wrap; margin-bottom: 1.5rem;
}
.btn {
  display: inline-block; padding: .55rem 1rem; border-radius: 8px;
  border: 1px solid var(--edge-border-strong); background: transparent;
  color: var(--edge-text); font: inherit; text-decoration: none; cursor: pointer;
}
.btn:hover { background: var(--edge-surface-2); }
.btn-primary {
  background: var(--edge-gradient); border-color: transparent;
  color: var(--edge-on-primary); font-weight: 600;
}
.btn-primary:hover { background: var(--edge-gradient); filter: brightness(1.08); }
.btn-block { display: block; width: 100%; text-align: center; }

.alert {
  margin: 0 0 1rem; padding: .7rem 1rem; border-radius: 8px;
  border: 1px solid var(--edge-border-strong); background: var(--edge-surface-2);
}
.alert p { margin: 0; }
.alert-success { color: var(--edge-success); background: var(--edge-success-bg); border-color: var(--edge-success); }
.alert-error { color: var(--edge-danger); background: var(--edge-danger-bg); border-color: var(--edge-danger); }

.badge {
  display: inline-block; padding: .1rem .6rem; border-radius: 999px;
  font-size: .8rem; border: 1px solid var(--edge-border-strong);
}
.badge-ok { color: var(--edge-success); border-color: var(--edge-success); }
.badge-off { color: var(--edge-muted); }

/* Tables */
.table-wrap { overflow-x: auto; padding: .5rem; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: .65rem .75rem; text-align: left; border-bottom: 1px solid var(--edge-border); }
th {
  color: var(--edge-muted); font-size: .8rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: .04em;
}
tbody tr:last-child td { border-bottom: 0; }

/* Forms */
.form { max-width: 36rem; }
.field { margin-bottom: 1rem; }
label { display: block; margin-bottom: .3rem; font-weight: 600; }
input:not([type="checkbox"]):not([type="hidden"]), select, textarea {
  width: 100%; padding: .55rem .7rem;
  background: var(--edge-bg); color: var(--edge-text);
  border: 1px solid var(--edge-border-strong); border-radius: 8px; font: inherit;
}
input[type="checkbox"] { width: 1.1rem; height: 1.1rem; accent-color: var(--edge-primary); }
.help { margin: .3rem 0 0; color: var(--edge-muted); font-size: .85rem; }
.error { margin: .3rem 0 0; color: var(--edge-danger); font-size: .9rem; }
.has-error input, .has-error select { border-color: var(--edge-danger); }
.actions { display: flex; gap: .75rem; flex-wrap: wrap; margin-top: 1.25rem; }

/* Login */
.auth { min-height: 100vh; display: grid; place-items: center; padding: 1rem; }
.auth-card { width: 100%; max-width: 24rem; }