@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #F5F7FB;
  --surface: #FFFFFF;
  --primary: #6C3EDB;
  --primary-soft: #8F6AF5;
  --secondary: #2E86FF;
  --text-primary: #1F2430;
  --text-secondary: #6B7280;
  --border-subtle: #E6EAF2;
  --success: #32C48D;
  --warning: #F7B955;
  --danger: #F06272;
  --control-bg: #F1F4FA;
  --shadow-card: 0 8px 24px rgba(15,23,42,0.06);
  --shadow-hover: 0 12px 32px rgba(15,23,42,0.12);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-pill: 999px;
  --transition: 180ms ease-out;
}

body {
  font-family: 'Inter', 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text-primary);
  min-height: 100vh;
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* =====================================================
   NAVBAR
   ===================================================== */
.navbar {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 0 2rem;
  height: 64px;
  background: var(--surface);
  box-shadow: 0 1px 0 var(--border-subtle);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-brand {
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.2px;
  background: linear-gradient(135deg, #6C3EDB, #8F6AF5);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  gap: 4px;
  margin-left: 1rem;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  transition: all var(--transition);
}
.nav-link:hover {
  background: var(--control-bg);
  color: var(--text-primary);
}
.nav-link.active {
  background: linear-gradient(135deg, #6C3EDB, #8F6AF5);
  color: #fff;
}

.nav-user {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text-secondary);
  font-size: 14px;
}
.nav-user span { font-weight: 500; }

/* =====================================================
   BUTTONS
   ===================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 20px;
  border: none;
  border-radius: var(--radius-md);
  background: var(--control-bg);
  color: var(--text-primary);
  text-decoration: none;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  font-family: inherit;
  transition: all var(--transition);
}
.btn:hover {
  background: var(--border-subtle);
}
.btn-primary {
  background: linear-gradient(135deg, #6C3EDB, #8F6AF5);
  color: #fff;
}
.btn-primary:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-1px);
}
.btn-block { display: flex; width: 100%; }
.btn-sm { padding: 6px 14px; font-size: 13px; border-radius: var(--radius-sm); }

/* =====================================================
   CONTAINER
   ===================================================== */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 32px 2rem;
}

/* =====================================================
   LOGIN PAGE
   ===================================================== */
.login-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: var(--bg);
}
.login-container {
  background: var(--surface);
  padding: 40px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  width: 100%;
  max-width: 400px;
}
.login-container h1 {
  text-align: center;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.2px;
  background: linear-gradient(135deg, #6C3EDB, #8F6AF5);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 4px;
}
.login-container h2 {
  text-align: center;
  font-weight: 400;
  color: var(--text-secondary);
  margin-bottom: 32px;
  font-size: 14px;
}
.form-group { margin-bottom: 20px; }
.form-group label {
  display: block;
  margin-bottom: 6px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
}
.form-group input {
  width: 100%;
  padding: 10px 14px;
  background: var(--control-bg);
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 14px;
  font-family: inherit;
  transition: all var(--transition);
  height: 44px;
}
.form-group input:focus {
  outline: none;
  border-color: var(--primary);
  background: var(--surface);
  box-shadow: 0 0 0 4px rgba(108,62,219,0.1);
}
.login-container .btn-primary {
  margin-top: 8px;
  height: 44px;
  font-size: 15px;
}

/* =====================================================
   ALERTS
   ===================================================== */
.alert {
  padding: 12px 16px;
  border-radius: var(--radius-md);
  margin-bottom: 20px;
  font-size: 14px;
  font-weight: 500;
}
.alert-error {
  background: rgba(240,98,114,0.1);
  color: var(--danger);
}

/* =====================================================
   PAGE HEADER
   ===================================================== */
h1 {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.2px;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.status-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
  font-size: 13px;
  color: var(--text-secondary);
}

/* =====================================================
   SUMMARY CARDS
   ===================================================== */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 24px;
  margin-bottom: 40px;
}
.card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-card);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
}
.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--border-subtle);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}
.card-label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 8px;
}
.card-value {
  font-size: 36px;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--text-primary);
  line-height: 1;
}
.card-success::before {
  background: linear-gradient(90deg, #32C48D, #5DDBA8);
}
.card-success .card-value { color: var(--success); }

.card-danger::before {
  background: linear-gradient(90deg, #F06272, #F48A96);
}
.card-danger .card-value { color: var(--danger); }

.card-warning::before {
  background: linear-gradient(90deg, #F7B955, #F9CE7F);
}
.card-warning .card-value { color: var(--warning); }

.card-primary::before {
  background: linear-gradient(90deg, #6C3EDB, #8F6AF5);
}
.card-primary .card-value { color: var(--primary); }

.card-secondary::before {
  background: linear-gradient(90deg, #2E86FF, #4DA3FF);
}
.card-secondary .card-value { color: var(--secondary); }

/* =====================================================
   TABLES
   ===================================================== */
.table-wrap {
  background: var(--surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}
table {
  width: 100%;
  border-collapse: collapse;
}
thead tr {
  border-bottom: 2px solid var(--border-subtle);
}
th {
  text-align: left;
  padding: 14px 20px;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-secondary);
  background: var(--surface);
}
td {
  padding: 14px 20px;
  font-size: 14px;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-subtle);
}
tr:last-child td { border-bottom: none; }
tbody tr {
  transition: background var(--transition);
}
tbody tr:hover {
  background: var(--control-bg);
}
.empty {
  text-align: center;
  color: var(--text-secondary);
  padding: 48px 20px !important;
  font-size: 15px;
}

/* =====================================================
   STATUS INDICATORS
   ===================================================== */
.status-dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
}
.dot-online {
  background: var(--success);
  box-shadow: 0 0 0 3px rgba(50,196,141,0.2);
}
.dot-offline {
  background: var(--danger);
  box-shadow: 0 0 0 3px rgba(240,98,114,0.2);
}

.row-offline td { opacity: 0.45; }
.row-error { background: rgba(240,98,114,0.04); }
.row-error:hover { background: rgba(240,98,114,0.08) !important; }

/* =====================================================
   SEVERITY BADGES
   ===================================================== */
.severity {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.2px;
}
.severity-error, .severity-critical {
  background: rgba(240,98,114,0.12);
  color: var(--danger);
}
.severity-warning {
  background: rgba(247,185,85,0.15);
  color: #D4940C;
}
.severity-info {
  background: rgba(46,134,255,0.1);
  color: var(--secondary);
}

/* =====================================================
   TEMPERATURE DISPLAY
   ===================================================== */
.temp-normal { color: var(--success); font-weight: 600; }
.temp-warm { color: var(--warning); font-weight: 600; }
.temp-hot { color: var(--danger); font-weight: 600; }

/* =====================================================
   BATTERY DISPLAY
   ===================================================== */
.battery {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  font-size: 13px;
}
.battery-bar {
  width: 28px;
  height: 12px;
  border-radius: 3px;
  background: var(--control-bg);
  overflow: hidden;
  position: relative;
}
.battery-bar-fill {
  height: 100%;
  border-radius: 3px;
  transition: width var(--transition);
}
.battery-high .battery-bar-fill { background: var(--success); }
.battery-mid .battery-bar-fill { background: var(--warning); }
.battery-low .battery-bar-fill { background: var(--danger); }
.battery-high { color: var(--success); }
.battery-mid { color: #D4940C; }
.battery-low { color: var(--danger); }

/* =====================================================
   RESPONSIVE
   ===================================================== */
@media (max-width: 768px) {
  .navbar {
    flex-wrap: wrap;
    height: auto;
    padding: 12px 16px;
    gap: 8px;
  }
  .nav-links { flex-wrap: wrap; }
  .nav-user { margin-left: 0; width: 100%; justify-content: flex-end; }
  .container { padding: 20px 16px; }
  .cards { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .card { padding: 16px; }
  .card-value { font-size: 28px; }
  th, td { padding: 10px 12px; }
}