/* ============================================================================
 * DOS Blackbox Hub — instructor dashboard. Forge dark theme aligned with the
 * local viewer at v2/styles.css so users feel a continuous product.
 * ========================================================================== */

:root {
  --bg-0:    #0b0f17;
  --bg-1:    #0e1219;
  --bg-2:    #141a26;
  --bg-3:    #1a212f;
  --bg-card: #161b25;
  --border:  #232b3a;
  --border-2:#2a3344;
  --text-0:  #f0f3f9;
  --text-1:  #cfd6e4;
  --text-2:  #8a93a6;
  --text-3:  #5b6478;
  --accent:  #5fb6ff;
  --accent-2:#1f3a5b;
  --warn:    #ffb547;
  --good:    #5fd07c;
  --bad:     #ff5e5e;
  --r-sm:    6px;
  --r-md:    10px;
  --r-lg:    14px;
  --t-fast:  140ms cubic-bezier(.2,.7,.3,1);
  --t-mid:   220ms cubic-bezier(.2,.7,.3,1);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font: 14px -apple-system, system-ui, 'Segoe UI', Inter, sans-serif;
  background: var(--bg-0);
  color: var(--text-1);
  min-height: 100vh;
}

/* Topbar ----------------------------------------------------------------- */

.topbar {
  height: 52px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding: 0 16px;
  background: linear-gradient(to bottom, var(--bg-2), var(--bg-1));
  border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 600; }
.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 32px; height: 32px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff;
  border-radius: var(--r-sm);
  font-size: 11px;
  letter-spacing: 0.08em;
}
.brand-mark.large { width: 56px; height: 56px; font-size: 18px; }
.brand-title { color: var(--text-0); }
.brand-tag {
  font-size: 10px;
  color: var(--text-2);
  background: var(--bg-3);
  padding: 2px 6px;
  border-radius: 999px;
}
.status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--text-2);
}
.status .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--text-3);
  transition: background var(--t-fast);
}
.status .dot.connected { background: var(--good); box-shadow: 0 0 8px rgba(95,208,124,0.6); }
.status .dot.error     { background: var(--bad); }
.actions {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 10px;
}
.user-name { color: var(--text-1); font-weight: 500; }
button {
  font: inherit;
  cursor: pointer;
  background: var(--bg-3);
  color: var(--text-1);
  border: 1px solid var(--border-2);
  border-radius: var(--r-sm);
  padding: 6px 12px;
  transition: background var(--t-fast), border-color var(--t-fast), transform var(--t-fast);
}
button:hover  { background: var(--bg-2); border-color: var(--accent); }
button:active { transform: translateY(1px); }
button.primary {
  background: linear-gradient(180deg, #2a4d77, var(--accent-2));
  border-color: #335d8c;
  color: #e9f1fb;
  font-weight: 600;
  padding: 10px 18px;
}
button.primary:hover { filter: brightness(1.1); }

/* Layout ----------------------------------------------------------------- */

.hub-main {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 16px;
  padding: 16px;
  height: calc(100vh - 52px);
  overflow: hidden;
}
@media (max-width: 1024px) {
  .hub-main { grid-template-columns: 1fr; }
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-height: 0;
}
.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(to bottom, var(--bg-2), var(--bg-card));
}
.card-header h2 {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-1);
}
.hint {
  font-size: 11px;
  color: var(--text-2);
  font-family: ui-monospace, monospace;
}

/* Roster (live flights) -------------------------------------------------- */

.roster {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 12px;
  padding: 14px;
  overflow: auto;
  flex: 1;
  align-content: start;
}
.roster .pilot-tile {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  cursor: pointer;
  transition: border-color var(--t-fast), transform var(--t-fast), box-shadow var(--t-fast);
}
.roster .pilot-tile:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.4);
}
.pilot-tile .pilot-head {
  display: flex; justify-content: space-between; align-items: center;
}
.pilot-tile .pilot-name { font-weight: 600; color: var(--text-0); }
.pilot-tile .pilot-mode {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  background: var(--accent-2);
  color: #cfe6ff;
  padding: 2px 6px;
  border-radius: 999px;
}
.pilot-tile .pilot-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  font-family: ui-monospace, monospace;
  font-size: 11px;
}
.pilot-tile .pilot-stat .lbl { color: var(--text-2); font-size: 9px; text-transform: uppercase; letter-spacing: 0.06em; }
.pilot-tile .pilot-stat .val { color: var(--text-0); }

/* Recent list ----------------------------------------------------------- */

.recent-list {
  overflow: auto;
  flex: 1;
}
.recent-list .recent {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  transition: background var(--t-fast);
}
.recent-list .recent:hover { background: var(--bg-2); }
.recent .recent-pilot { color: var(--text-0); font-weight: 500; }
.recent .recent-meta { font-size: 11px; color: var(--text-2); font-family: ui-monospace, monospace; }
.empty { padding: 24px; text-align: center; color: var(--text-3); }

/* Login overlay --------------------------------------------------------- */

.login-overlay {
  position: fixed;
  inset: 0;
  background: rgba(11, 15, 23, 0.85);
  backdrop-filter: blur(8px);
  display: grid;
  place-items: center;
  z-index: 9000;
  animation: fade-in var(--t-mid);
}
.login-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 32px 36px;
  max-width: 420px;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 14px;
  align-items: center;
  box-shadow: 0 24px 64px rgba(0,0,0,0.6);
}
.login-card h1 { margin: 0; font-size: 22px; color: var(--text-0); font-weight: 600; }
.login-card p  { margin: 0; color: var(--text-2); line-height: 1.55; }

@keyframes fade-in { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }