/*
 * QSP console shell.
 *
 * Layout, navigation and empty states only. No component here renders data,
 * because no data source exists yet; the empty states are the real UI for this
 * phase, not a placeholder for one.
 */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  /* Never disable zoom. */
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--color-background);
  color: var(--color-foreground);
  font-family: var(--font-ui);
  font-size: var(--text-base);
  font-weight: var(--weight-normal);
  line-height: var(--leading-normal);
  -webkit-font-smoothing: antialiased;
}

/* ---- Focus ---------------------------------------------------------- */
/*
 * Focus rings are never removed. :focus-visible keeps them out of the way of
 * pointer users while guaranteeing they exist for keyboard users.
 */
:focus-visible {
  outline: 2px solid var(--color-accent-hover);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

.skip-link {
  position: absolute;
  left: var(--space-3);
  top: -4rem;
  z-index: 100;
  padding: var(--space-2) var(--space-4);
  background: var(--color-accent);
  color: var(--color-foreground);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: top var(--duration-fast) var(--ease-out-expo);
}

.skip-link:focus {
  top: var(--space-3);
}

/* ---- Shell ---------------------------------------------------------- */
.shell {
  display: grid;
  grid-template-columns: var(--layout-sidebar) minmax(0, 1fr);
  grid-template-rows: auto minmax(0, 1fr);
  grid-template-areas:
    "brand  topbar"
    "nav    main";
  min-height: 100vh;
}

.brand {
  grid-area: brand;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  border-right: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.brand__mark {
  flex: none;
  width: 28px;
  height: 28px;
  color: var(--color-primary);
}

.brand__name {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-wide);
}

.brand__tagline {
  margin: 0;
  font-size: var(--text-xs);
  color: var(--color-foreground-subtle);
}

.topbar {
  grid-area: topbar;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--color-border);
}

.topbar__meta {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-foreground-muted);
}

/* ---- Navigation ------------------------------------------------------ */
.nav {
  grid-area: nav;
  padding: var(--space-4) var(--space-3);
  border-right: 1px solid var(--color-border);
}

.nav__group {
  margin: 0 0 var(--space-5);
  padding: 0;
  list-style: none;
}

.nav__heading {
  margin: 0 0 var(--space-2);
  padding: 0 var(--space-3);
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--color-foreground-subtle);
}

.nav__link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-height: var(--target-min);
  padding: 0 var(--space-3);
  border-radius: var(--radius-md);
  color: var(--color-foreground-muted);
  text-decoration: none;
  cursor: pointer;
  transition:
    background var(--duration-fast) var(--ease-out-expo),
    color var(--duration-fast) var(--ease-out-expo);
}

.nav__link:hover {
  background: var(--color-surface);
  color: var(--color-foreground);
}

.nav__link[aria-current="page"] {
  background: var(--color-surface);
  color: var(--color-foreground);
  box-shadow: inset 2px 0 0 var(--color-primary);
}

.nav__link[aria-disabled="true"] {
  color: var(--color-foreground-subtle);
  cursor: not-allowed;
}

.nav__icon {
  flex: none;
  width: 18px;
  height: 18px;
}

.nav__phase {
  margin-left: auto;
  padding: 2px var(--space-2);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-foreground-subtle);
}

/* ---- Main ------------------------------------------------------------ */
.main {
  grid-area: main;
  padding: var(--space-6) var(--space-5);
  max-width: var(--layout-max);
}

.page__title {
  margin: 0 0 var(--space-2);
  font-size: var(--text-2xl);
  font-weight: var(--weight-semibold);
  line-height: var(--leading-tight);
}

.page__lede {
  margin: 0 0 var(--space-6);
  max-width: 62ch;
  color: var(--color-foreground-muted);
}

/* ---- Empty state ----------------------------------------------------- */
/*
 * Empty states are first-class UI, not a gap waiting to be filled with sample
 * data. QSP never ships seeded demo content.
 */
.empty {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-6);
  border: 1px dashed var(--color-border-strong);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
}

.empty__icon {
  width: 32px;
  height: 32px;
  color: var(--color-foreground-subtle);
}

.empty__title {
  margin: 0;
  font-size: var(--text-lg);
  font-weight: var(--weight-semibold);
}

.empty__body {
  margin: 0;
  max-width: 60ch;
  color: var(--color-foreground-muted);
}

/* ---- Status pill ----------------------------------------------------- */
/*
 * Colour is always accompanied by a glyph and a text label so that status is
 * legible without colour perception.
 */
.status {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  border: 1px solid var(--color-border-strong);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
}

.status__glyph {
  width: 12px;
  height: 12px;
}

.status--healthy { color: var(--color-healthy); }
.status--degraded { color: var(--color-degraded); }
.status--failing { color: var(--color-failing); }
.status--unavailable { color: var(--color-unavailable); }

/* ---- Connection indicator -------------------------------------------- */
.stream {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.stream__label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-foreground-muted);
}

/* ---- Responsive ------------------------------------------------------ */
/* Mobile is not a shrunk desktop: the sidebar becomes a horizontal rail. */
@media (max-width: 1023px) {
  .shell {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas:
      "brand"
      "topbar"
      "nav"
      "main";
  }

  .brand,
  .nav {
    border-right: none;
  }

  .nav {
    border-bottom: 1px solid var(--color-border);
    overflow-x: auto;
  }

  .nav__group {
    display: flex;
    gap: var(--space-2);
    margin-bottom: var(--space-2);
  }

  .nav__heading {
    display: none;
  }

  .nav__link {
    white-space: nowrap;
  }

  .nav__phase {
    display: none;
  }
}

@media (max-width: 767px) {
  .main {
    padding: var(--space-5) var(--space-4);
  }

  .topbar {
    flex-wrap: wrap;
  }
}

/* ---- Peer table ------------------------------------------------------ */
/*
 * A dense operations table, not a card grid. An operator scanning for one
 * callsign among twenty wants aligned columns and monospaced identifiers.
 */
.panel {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  overflow: hidden;
}

.panel__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--color-border);
}

.panel__title {
  margin: 0;
  font-size: var(--text-lg);
  font-weight: var(--weight-semibold);
}

.panel__count {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-wide);
  color: var(--color-foreground-subtle);
  text-transform: uppercase;
}

.table-scroll {
  overflow-x: auto;
}

.table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

.table caption {
  padding: var(--space-3) var(--space-5);
  text-align: left;
  color: var(--color-foreground-subtle);
  font-size: var(--text-xs);
}

.table th {
  padding: var(--space-3) var(--space-5);
  text-align: left;
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--color-foreground-subtle);
  border-bottom: 1px solid var(--color-border);
  white-space: nowrap;
}

.table td {
  padding: var(--space-3) var(--space-5);
  border-bottom: 1px solid var(--color-border);
  white-space: nowrap;
}

.table tr:last-child td {
  border-bottom: none;
}

/* Identifiers are monospaced so digits align down the column. */
.table .mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.table .callsign {
  font-family: var(--font-mono);
  font-weight: var(--weight-semibold);
  letter-spacing: 0.02em;
}

/*
 * A newly arrived peer is highlighted briefly. Motion here depicts something
 * real — a peer that just registered — rather than decorating the table.
 */
@keyframes peer-arrive {
  from { background: rgba(52, 211, 153, 0.16); }
  to   { background: transparent; }
}

.table tr.is-new td {
  animation: peer-arrive var(--duration-slow) var(--ease-out-expo);
}

@media (prefers-reduced-motion: reduce) {
  .table tr.is-new td { animation: none; }
}

@media (max-width: 767px) {
  .table th:nth-child(n + 5),
  .table td:nth-child(n + 5) {
    display: none;
  }
}

/* ---- Call activity --------------------------------------------------- */
/*
 * A live transmission pulses. Motion here depicts something real — somebody is
 * keyed up at this moment — rather than decorating the page.
 */
@keyframes call-live {
  0%, 100% { opacity: 1; }
  50%      { opacity: 0.45; }
}

.live-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-healthy);
  animation: call-live 1.4s var(--ease-out-expo) infinite;
}

@media (prefers-reduced-motion: reduce) {
  .live-dot { animation: none; }
}

.tag {
  display: inline-block;
  padding: 1px var(--space-2);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-foreground-subtle);
}

.tag--lost {
  border-color: var(--color-degraded);
  color: var(--color-degraded);
}

/* ---- Traffic counters ------------------------------------------------ */
.metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 1px;
  background: var(--color-border);
}

.metric {
  padding: var(--space-4) var(--space-5);
  background: var(--color-surface);
}

.metric__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-xl);
  font-weight: var(--weight-semibold);
  line-height: var(--leading-tight);
}

.metric__label {
  margin-top: var(--space-1);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--color-foreground-subtle);
}

.metric--muted .metric__value { color: var(--color-foreground-subtle); }
.metric--warn .metric__value { color: var(--color-degraded); }

.hint {
  padding: var(--space-3) var(--space-5);
  border-top: 1px solid var(--color-border);
  color: var(--color-degraded);
  font-size: var(--text-sm);
}