:root {
  --cyan: #3de0ff;
  --text: #e8f4ff;
  --muted: #8aa3bb;
  --dim: #5b738a;
  --line: rgba(61, 224, 255, 0.22);
  --bg: #050b16;
  --panel: rgba(6, 16, 32, 0.92);
  font-family: "Exo 2", sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; background: var(--bg); color: var(--text); }

.back-shell {
  display: grid;
  grid-template-columns: 220px 1fr;
  min-height: 100vh;
}

.back-rail {
  display: flex;
  flex-direction: column;
  padding: 1.4rem 1rem;
  border-right: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(8, 22, 42, 0.95), rgba(4, 10, 20, 0.98));
}

.back-brand {
  font-family: Orbitron, sans-serif;
  font-weight: 700;
  letter-spacing: 0.22em;
  color: var(--text);
  text-decoration: none;
  font-size: 0.95rem;
}
.back-brand span { color: var(--cyan); margin-left: 0.25em; }

.back-rail-kicker {
  margin: 0.45rem 0 1.4rem;
  font-family: Orbitron, sans-serif;
  font-size: 0.58rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.back-nav { display: flex; flex-direction: column; gap: 0.3rem; }
.back-nav[hidden],
.back-desk[hidden],
.back-login[hidden],
#back-logout[hidden] {
  display: none !important;
}
.back-nav-btn {
  text-align: left;
  background: transparent;
  border: 1px solid transparent;
  color: var(--muted);
  padding: 0.55rem 0.7rem;
  border-radius: 10px;
  font-family: Orbitron, sans-serif;
  font-size: 0.58rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  cursor: pointer;
}
.back-nav-btn.is-active,
.back-nav-btn:hover {
  color: var(--cyan);
  border-color: var(--line);
  background: rgba(61, 224, 255, 0.08);
}

.back-rail-foot { margin-top: auto; display: flex; flex-direction: column; gap: 0.45rem; }
.back-who { margin: 0; font-size: 0.78rem; color: var(--muted); }
.back-link {
  background: none;
  border: 0;
  color: var(--cyan);
  text-align: left;
  padding: 0;
  cursor: pointer;
  text-decoration: none;
  font-size: 0.82rem;
}

.back-main { padding: 2rem 2.2rem; }
.back-login, .back-desk { max-width: 920px; }
.back-login h1, .back-head h1 {
  font-family: Orbitron, sans-serif;
  letter-spacing: 0.12em;
  font-size: 1.35rem;
  margin: 0 0 0.5rem;
}
.back-login p, .back-head p { color: var(--muted); margin: 0 0 1.2rem; }

.back-login form {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  max-width: 360px;
  padding: 1.2rem;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--panel);
}
.back-login label { display: flex; flex-direction: column; gap: 0.3rem; font-size: 0.72rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--dim); }
.back-login input, .back-login button {
  min-height: 2.4rem;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: rgba(3, 10, 22, 0.8);
  color: var(--text);
  padding: 0.4rem 0.7rem;
  font: inherit;
}
.back-login button {
  background: linear-gradient(135deg, #7ef0ff, #2b9bff);
  color: #041018;
  font-family: Orbitron, sans-serif;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  cursor: pointer;
}

.back-msg { font-size: 0.85rem; color: var(--cyan); }
.back-msg.is-error { color: #ff8a8a; }

.back-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 0.75rem; }
.back-card {
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 1rem 1.1rem;
  background: var(--panel);
}
.back-card h2 { margin: 0 0 0.25rem; font-size: 1rem; }
.back-meta { display: flex; flex-wrap: wrap; gap: 0.55rem; font-size: 0.75rem; color: var(--muted); margin-bottom: 0.45rem; }
.back-badge {
  font-family: Orbitron, sans-serif;
  font-size: 0.52rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.15rem 0.5rem;
  color: var(--cyan);
}
.back-card p { margin: 0.35rem 0; white-space: pre-wrap; color: var(--text); }
.back-actions { display: flex; gap: 0.4rem; margin-top: 0.7rem; }
.back-actions button {
  border-radius: 10px;
  border: 1px solid var(--line);
  background: rgba(61, 224, 255, 0.12);
  color: var(--cyan);
  padding: 0.4rem 0.7rem;
  cursor: pointer;
  font-family: Orbitron, sans-serif;
  font-size: 0.52rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

@media (max-width: 800px) {
  .back-shell { grid-template-columns: 1fr; }
  .back-rail { border-right: 0; border-bottom: 1px solid var(--line); }
  .back-nav { flex-direction: row; flex-wrap: wrap; }
}