:root {
  color-scheme: dark;
  font-family: Inter, Arial, sans-serif;
  background: #0b1016;
  color: #eef4fa;
}

* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; background: #0b1016; }
button, input { font: inherit; }
[hidden] { display: none !important; }

.sidebar {
  position: fixed;
  inset: 0 auto 0 0;
  width: 230px;
  display: flex;
  flex-direction: column;
  background: #0f151d;
  border-right: 1px solid #202b36;
  padding: 18px 12px;
}

.brand, .login-brand { font-size: 18px; font-weight: 900; color: #ff7a3d; letter-spacing: .02em; }
.brand { margin: 4px 8px 18px; }
.sidebar nav { display: flex; flex: 1; min-height: 0; flex-direction: column; }
.nav-pages { display: grid; gap: 5px; overflow-y: auto; }
.nav-btn { border: 0; background: transparent; color: #9eb0c3; text-align: left; padding: 10px 12px; border-radius: 9px; font-weight: 700; cursor: pointer; }
.nav-btn:hover, .nav-btn.active { background: #18222d; color: #fff; }

.session-card { margin-top: auto; padding: 14px 10px 4px; border-top: 1px solid #263341; display: grid; gap: 5px; }
.session-card strong { overflow: hidden; text-overflow: ellipsis; }
.session-card span { color: #8799ac; font-size: 12px; }
.logout-btn { margin-top: 7px; border: 1px solid #344454; border-radius: 8px; padding: 8px 10px; background: transparent; color: #dbe6ef; cursor: pointer; }
.logout-btn:hover { border-color: #ff7a3d; color: #fff; }

.app { margin-left: 230px; padding: 24px; min-height: 100vh; }
.page-head { display: flex; justify-content: space-between; gap: 12px; align-items: flex-start; margin-bottom: 18px; }
.page-head h1 { font-size: 30px; margin: 0 0 5px; }
.page-head p { margin: 0; color: #8799ac; }
.metrics { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; margin-bottom: 16px; }
.metrics article, .panel { background: #111923; border: 1px solid #263341; border-radius: 15px; padding: 16px; }
.metrics b { display: block; font-size: 28px; }
.metrics span { color: #8fa0b5; font-size: 12px; }
.panel h2 { margin-top: 0; }

.app-auth { margin-left: 0; display: grid; place-items: center; padding: 24px; background: radial-gradient(circle at 50% 10%, #172230 0, #0b1016 54%); }
.login-card { width: min(100%, 420px); padding: 34px; background: #111923; border: 1px solid #2b3948; border-radius: 18px; box-shadow: 0 24px 80px rgba(0, 0, 0, .36); }
.login-brand { margin-bottom: 24px; }
.login-card h1 { margin: 0 0 8px; font-size: 28px; }
.login-copy { margin: 0 0 24px; color: #8fa0b5; }
.login-card form, .login-card label { display: grid; gap: 8px; }
.login-card form { gap: 16px; }
.login-card label { color: #b7c4d0; font-size: 13px; font-weight: 700; }
.login-card input { width: 100%; border: 1px solid #344454; border-radius: 10px; padding: 12px 13px; background: #0b1118; color: #fff; outline: none; }
.login-card input:focus { border-color: #ff7a3d; box-shadow: 0 0 0 3px rgba(255, 122, 61, .14); }
.login-error { min-height: 18px; margin: -2px 0 0; color: #ff8a7a; font-size: 13px; }
.login-btn { border: 0; border-radius: 10px; padding: 12px 16px; background: #ff6a2a; color: #fff; font-weight: 800; cursor: pointer; }
.login-btn:hover { background: #ff7a3d; }
.login-btn:disabled, .logout-btn:disabled { opacity: .6; cursor: wait; }

@media (max-width: 900px) {
  .sidebar { width: 185px; }
  .app { margin-left: 185px; }
  .app-auth { margin-left: 0; }
  .metrics { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 640px) {
  .sidebar { width: 160px; }
  .app { margin-left: 160px; padding: 16px; }
  .app-auth { margin-left: 0; }
  .metrics { grid-template-columns: 1fr; }
  .login-card { padding: 24px; }
}