:root {
  --bg: #0a0a0c;
  --bg-panel: #131315;
  --bg-card: #19191c;
  --border: #2b2b2f;
  --text: #f2f2f4;
  --text-muted: #97979d;
  --primary: #c7c7cc;
  --primary-hover: #e5e5ea;
  --primary-contrast: #0a0a0c;
  --primary-rgb: 199, 199, 204;
  --success: #34c759;
  --danger: #ff5c5c;
  --warning: #f5a623;
  --radius: 8px;
  --logo-accent: linear-gradient(135deg, #6e6e73 0%, #e8e8ec 30%, #ffffff 50%, #c2c2c7 70%, #6e6e73 100%);
}

:root[data-theme="light"] {
  --bg: #f2f2f4;
  --bg-panel: #ffffff;
  --bg-card: #ffffff;
  --border: #dcdce0;
  --text: #17171a;
  --text-muted: #68686d;
  --primary: #3a3a3d;
  --primary-hover: #1c1c1e;
  --primary-contrast: #ffffff;
  --primary-rgb: 58, 58, 61;
  --logo-accent: #3a3a3d;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  transition: background-color 0.15s ease, color 0.15s ease;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.layout { display: flex; min-height: 100vh; }

.sidebar {
  width: 240px;
  flex-shrink: 0;
  background: var(--bg-panel);
  border-right: 1px solid var(--border);
  padding: 16px 0;
  display: flex;
  flex-direction: column;
}

.sidebar .brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 20px 16px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 12px;
}

.brand-icon { display: inline-flex; flex-shrink: 0; width: 26px; height: 26px; }
.brand-icon-lg { width: 56px; height: 56px; }
.logo-icon-img { width: 100%; height: 100%; object-fit: contain; display: block; }

.brand-text {
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 0.01em;
  color: var(--text);
  margin: 0;
}
.brand-text .accent {
  background: var(--logo-accent);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.sidebar nav a {
  display: block;
  padding: 10px 20px;
  color: var(--text-muted);
  font-weight: 500;
}
.sidebar nav a:hover { background: rgba(255,255,255,0.04); text-decoration: none; color: var(--text); }
.sidebar nav a.active { color: var(--text); background: rgba(var(--primary-rgb), 0.14); border-right: 3px solid var(--primary); }
.sidebar nav .section-title {
  padding: 16px 20px 6px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

.main { flex: 1; display: flex; flex-direction: column; min-width: 0; }

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-panel);
}

.topbar .user-info { display: flex; align-items: center; gap: 12px; }
.topbar .role-badge {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 999px;
  background: rgba(var(--primary-rgb), 0.16);
  color: var(--primary);
  font-weight: 600;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-muted);
  cursor: pointer;
  padding: 0;
}
.theme-toggle:hover { color: var(--text); border-color: var(--primary); }
.theme-toggle .icon-moon { display: none; }
:root[data-theme="light"] .theme-toggle .icon-sun { display: none; }
:root[data-theme="light"] .theme-toggle .icon-moon { display: inline-flex; }

.content { padding: 24px; flex: 1; }

.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  flex-wrap: wrap;
  gap: 12px;
}
.page-header h1 { margin: 0; font-size: 22px; }
.page-header .subtitle { color: var(--text-muted); font-size: 13px; margin-top: 4px; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text);
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
}
.btn:hover { text-decoration: none; border-color: var(--primary); }
.btn-primary { background: var(--primary); border-color: var(--primary); color: var(--primary-contrast); }
.btn-primary:hover { background: var(--primary-hover); border-color: var(--primary-hover); }
.btn-danger { background: transparent; border-color: var(--danger); color: var(--danger); }
.btn-danger:hover { background: var(--danger); color: #fff; }
.btn-sm { padding: 5px 10px; font-size: 12px; }

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}

.grid { display: grid; gap: 16px; }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 900px) {
  .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr 1fr; }
}

.stat-card { padding: 18px; }
.stat-card .label { color: var(--text-muted); font-size: 12px; text-transform: uppercase; letter-spacing: 0.04em; }
.stat-card .value { font-size: 28px; font-weight: 700; margin-top: 6px; }

table { width: 100%; border-collapse: collapse; }
table th, table td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  font-size: 13px;
}
table th { color: var(--text-muted); font-weight: 600; font-size: 12px; text-transform: uppercase; }
table tr:hover td { background: rgba(255,255,255,0.02); }

.badge {
  display: inline-block;
  padding: 2px 9px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 600;
}
.badge-success { background: rgba(52,199,89,0.15); color: var(--success); }
.badge-danger { background: rgba(255,92,92,0.15); color: var(--danger); }
.badge-warning { background: rgba(245,166,35,0.15); color: var(--warning); }
.badge-muted { background: rgba(150,150,157,0.15); color: var(--text-muted); }
.badge-primary { background: rgba(var(--primary-rgb), 0.16); color: var(--primary); }

form .field { margin-bottom: 16px; }
form label { display: block; margin-bottom: 6px; font-weight: 600; font-size: 13px; }
form .hint { color: var(--text-muted); font-size: 12px; margin-top: 4px; }
input[type="text"], input[type="password"], input[type="email"], input[type="number"],
input[type="file"], select, textarea {
  width: 100%;
  padding: 9px 12px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 13px;
  font-family: inherit;
}
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--primary); }
textarea { resize: vertical; min-height: 80px; }
.checkbox-field { display: flex; align-items: center; gap: 8px; }
.checkbox-field input { width: auto; }

.form-actions { display: flex; gap: 10px; margin-top: 20px; }

.flash { padding: 12px 16px; border-radius: var(--radius); margin-bottom: 16px; font-size: 13px; }
.flash-success { background: rgba(52,199,89,0.12); border: 1px solid rgba(52,199,89,0.3); color: var(--success); }
.flash-error { background: rgba(255,92,92,0.12); border: 1px solid rgba(255,92,92,0.3); color: var(--danger); }

.filters { display: flex; gap: 8px; margin-bottom: 16px; flex-wrap: wrap; }
.filters a {
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 12px;
  font-weight: 600;
}
.filters a.active { background: var(--primary); border-color: var(--primary); color: var(--primary-contrast); }

.empty-state {
  text-align: center;
  padding: 48px 20px;
  color: var(--text-muted);
}

.password-toggle-wrap { position: relative; }
.password-toggle-wrap button {
  position: absolute;
  right: 6px;
  top: 6px;
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 12px;
  padding: 4px 8px;
}

.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  background: radial-gradient(circle at top, var(--bg-card), var(--bg));
}
.login-theme-toggle { position: absolute; top: 20px; right: 20px; }
.login-card { width: 360px; padding: 32px; }
.login-brand { display: flex; flex-direction: column; align-items: center; gap: 10px; margin-bottom: 4px; }
.login-brand .brand-text { text-align: center; font-size: 24px; margin: 0; }
.login-card .subtitle { text-align: center; color: var(--text-muted); font-size: 13px; margin-bottom: 24px; }

.ip-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 8px; }
.ip-cell {
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 10px;
  cursor: pointer;
  font-size: 12px;
}
.ip-cell .ip-addr { font-weight: 700; font-family: monospace; }
.ip-cell.status-livre { background: rgba(150,150,157,0.06); }
.ip-cell.status-em_uso { background: rgba(var(--primary-rgb), 0.1); border-color: rgba(var(--primary-rgb), 0.35); }
.ip-cell.status-reservado { background: rgba(245,166,35,0.1); border-color: rgba(245,166,35,0.3); }
.ip-cell.status-bloqueado { background: rgba(255,92,92,0.1); border-color: rgba(255,92,92,0.3); }

.text-muted { color: var(--text-muted); }
.mt-0 { margin-top: 0; }

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 20px;
}
.modal-card { width: 420px; max-width: 100%; padding: 28px; }
.modal-card h2 { margin-top: 0; }
.modal-card .form-actions { justify-content: flex-end; }