:root {
  --bg: #0a0e14;
  --sidebar: #101820;
  --card: rgba(18, 28, 40, 0.92);
  --border: rgba(56, 189, 248, 0.22);
  --accent: #38bdf8;
  --accent2: #22d3ee;
  --text: #e8f1f8;
  --muted: #7a93a8;
  --danger: #f87171;
  --success: #34d399;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: "IBM Plex Sans", "Segoe UI", "PingFang SC", sans-serif;
  background:
    radial-gradient(ellipse 80% 50% at 20% -10%, rgba(56,189,248,0.18), transparent 55%),
    radial-gradient(ellipse 60% 40% at 90% 0%, rgba(34,211,238,0.1), transparent 50%),
    var(--bg);
  color: var(--text);
  min-height: 100vh;
}
.hidden { display: none !important; }

.login-page { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 24px; }
.login-card {
  width: 380px; padding: 40px; background: var(--card);
  border: 1px solid var(--border); border-radius: 14px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.35);
}
.login-card h1 {
  font-size: 24px; font-weight: 700; letter-spacing: -0.02em;
  background: linear-gradient(110deg, var(--accent), #a5f3fc);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.login-sub { color: var(--muted); font-size: 13px; margin: 8px 0 24px; line-height: 1.45; }
.login-card input {
  width: 100%; padding: 12px 14px; margin-bottom: 12px;
  background: #0b1220; border: 1px solid var(--border); border-radius: 8px; color: var(--text);
}
.login-card button {
  width: 100%; padding: 12px; border: none; border-radius: 8px; cursor: pointer;
  background: linear-gradient(135deg, #0ea5e9, #22d3ee); color: #041018; font-weight: 700;
}
.error { color: var(--danger); font-size: 13px; margin-top: 10px; min-height: 18px; }
.hint { color: var(--muted); font-size: 12px; margin-top: 16px; line-height: 1.5; }
.hint a { color: var(--accent); }

.app { display: flex; min-height: 100vh; }
.sidebar {
  width: 220px; background: var(--sidebar); border-right: 1px solid var(--border);
  display: flex; flex-direction: column;
}
.brand {
  padding: 20px; font-weight: 700; letter-spacing: 0.12em; color: var(--accent);
  font-size: 13px; border-bottom: 1px solid var(--border);
}
.sidebar nav { flex: 1; padding: 12px 0; }
.sidebar nav a {
  display: block; padding: 10px 20px; color: var(--muted); text-decoration: none; font-size: 14px; cursor: pointer;
}
.sidebar nav a:hover, .sidebar nav a.active {
  color: var(--accent); background: rgba(56,189,248,0.07);
}
.logout-btn {
  margin: 12px; padding: 10px; background: transparent; border: 1px solid var(--border);
  color: var(--muted); border-radius: 8px; cursor: pointer;
}

.main { flex: 1; display: flex; flex-direction: column; min-width: 0; }
.topbar {
  padding: 16px 24px; border-bottom: 1px solid var(--border);
  display: flex; justify-content: space-between; align-items: center;
}
.topbar h2 { font-size: 18px; }
.topbar span { color: var(--muted); font-size: 13px; }
.content { padding: 24px; flex: 1; overflow: auto; }

.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 14px; margin-bottom: 20px; }
.card {
  background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 18px;
}
.card .label { color: var(--muted); font-size: 12px; }
.card .value { font-size: 26px; font-weight: 700; margin-top: 6px; color: var(--accent); }
.note {
  background: var(--card); border: 1px solid var(--border); border-radius: 12px;
  padding: 16px; color: var(--muted); font-size: 13px; line-height: 1.6; margin-bottom: 20px;
}

.toolbar { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 14px; align-items: center; }
.toolbar input, .toolbar select, .form-grid input, .form-grid textarea, .form-grid select {
  padding: 8px 12px; background: #0b1220; border: 1px solid var(--border); border-radius: 8px; color: var(--text);
}
.toolbar button, .btn {
  padding: 8px 14px; border: none; border-radius: 8px; cursor: pointer; font-size: 13px;
  background: linear-gradient(135deg, #0ea5e9, #22d3ee); color: #041018; font-weight: 600;
}
.btn.secondary, .toolbar button.secondary {
  background: transparent; border: 1px solid var(--border); color: var(--muted);
}
.btn.danger { background: transparent; border: 1px solid rgba(248,113,113,0.4); color: var(--danger); }

table {
  width: 100%; border-collapse: collapse; background: var(--card);
  border: 1px solid var(--border); border-radius: 12px; overflow: hidden;
}
th, td { padding: 10px 12px; text-align: left; border-bottom: 1px solid var(--border); font-size: 13px; }
th { background: rgba(56,189,248,0.06); color: var(--accent); font-weight: 600; }
tr:hover td { background: rgba(255,255,255,0.02); }

.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; max-width: 720px; margin-bottom: 16px; }
.form-grid label { display: flex; flex-direction: column; gap: 6px; font-size: 12px; color: var(--muted); }
.form-grid .full { grid-column: 1 / -1; }
.form-grid textarea { min-height: 80px; resize: vertical; }
.tag { display: inline-block; padding: 2px 8px; border-radius: 4px; font-size: 12px; background: rgba(56,189,248,0.12); color: var(--accent); }
.tag.off { background: rgba(122,147,168,0.15); color: var(--muted); }

@media (max-width: 720px) {
  .app { flex-direction: column; }
  .sidebar { width: 100%; }
  .form-grid { grid-template-columns: 1fr; }
}