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

:root {
  --bg-primary: #f0f2f5;
  --bg-secondary: #ffffff;
  --bg-card: #ffffff;
  --bg-input: #f7f8fa;
  --text-primary: #1a1d26;
  --text-secondary: #8b8fa3;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --accent-light: #eff6ff;
  --accent-gradient: linear-gradient(135deg, #3b82f6 0%, #0ea5e9 100%);
  --success: #10b981;
  --success-bg: #ecfdf5;
  --danger: #ef4444;
  --danger-bg: #fef2f2;
  --warning: #f59e0b;
  --warning-bg: #fffbeb;
  --border: #e5e7eb;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);
  --radius: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ==================== LOGIN - SCIFI ==================== */
.login-container {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 20px;
  background: #050a18;
  position: relative;
  overflow: hidden;
}

/* Animated grid background */
.login-container::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background-image:
    linear-gradient(rgba(59,130,246,0.12) 1px, transparent 1px),
    linear-gradient(90deg, rgba(59,130,246,0.12) 1px, transparent 1px);
  background-size: 50px 50px;
  animation: gridMove 15s linear infinite;
}

@keyframes gridMove {
  0% { transform: perspective(500px) rotateX(0deg); }
  100% { transform: perspective(500px) rotateX(0deg) translateY(50px); }
}

/* Glowing orbs */
.login-container .orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  animation: orbFloat 8s ease-in-out infinite;
}

.login-container .orb-1 {
  width: 400px; height: 400px;
  background: rgba(59, 130, 246, 0.25);
  top: -100px; left: -100px;
}

.login-container .orb-2 {
  width: 300px; height: 300px;
  background: rgba(14, 165, 233, 0.2);
  bottom: -80px; right: -80px;
  animation-delay: 4s;
}

.login-container .orb-3 {
  width: 200px; height: 200px;
  background: rgba(59, 130, 246, 0.15);
  top: 40%; left: 60%;
  animation-delay: 2s;
}

@keyframes orbFloat {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(30px, -20px) scale(1.05); }
  66% { transform: translate(-20px, 30px) scale(0.95); }
}

/* Particles */
.particles {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  pointer-events: none;
  z-index: 0;
}

.particle {
  position: absolute;
  width: 2px; height: 2px;
  background: rgba(59, 130, 246, 0.8);
  border-radius: 50%;
  animation: particleUp linear infinite;
  box-shadow: 0 0 6px rgba(59, 130, 246, 0.6);
}

@keyframes particleUp {
  0% { transform: translateY(100vh) scale(0); opacity: 0; }
  10% { opacity: 1; }
  90% { opacity: 1; }
  100% { transform: translateY(-10vh) scale(1); opacity: 0; }
}

/* Scan line */
.login-container .scan-line {
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, rgba(59,130,246,0.6), transparent);
  animation: scanDown 4s linear infinite;
  z-index: 0;
  box-shadow: 0 0 20px rgba(59, 130, 246, 0.4);
}

@keyframes scanDown {
  0% { top: -2px; }
  100% { top: 100%; }
}

.login-box {
  background: rgba(10, 15, 30, 0.85);
  backdrop-filter: blur(30px);
  padding: 48px 44px;
  border-radius: var(--radius-xl);
  width: 100%;
  max-width: 440px;
  box-shadow:
    0 0 60px rgba(59, 130, 246, 0.15),
    0 0 120px rgba(59, 130, 246, 0.08),
    inset 0 1px 0 rgba(255,255,255,0.08);
  position: relative;
  z-index: 1;
  border: 1px solid rgba(59, 130, 246, 0.3);
}

/* Corner accents */
.login-box::before, .login-box::after {
  content: '';
  position: absolute;
  width: 40px; height: 40px;
  border: 2px solid rgba(59, 130, 246, 0.4);
}

.login-box::before {
  top: -1px; left: -1px;
  border-right: none; border-bottom: none;
  border-radius: 20px 0 0 0;
}

.login-box::after {
  bottom: -1px; right: -1px;
  border-left: none; border-top: none;
  border-radius: 0 0 20px 0;
}

.login-box::before {
  top: -1px; left: -1px;
  border-right: none; border-bottom: none;
  border-radius: 20px 0 0 0;
}

.login-box::after {
  bottom: -1px; right: -1px;
  border-left: none; border-top: none;
  border-radius: 0 0 20px 0;
}

.login-logo {
  text-align: center;
  margin-bottom: 24px;
}

.login-logo img {
  width: 100px;
  height: 100px;
  border-radius: 20px;
  object-fit: contain;
  background: rgba(255,255,255,0.1);
  padding: 10px;
  border: 2px solid rgba(59, 130, 246, 0.4);
  box-shadow: 0 0 30px rgba(59, 130, 246, 0.4), 0 0 60px rgba(59, 130, 246, 0.15);
  animation: logoGlow 3s ease-in-out infinite;
}

@keyframes logoGlow {
  0%, 100% { box-shadow: 0 0 30px rgba(59, 130, 246, 0.3), 0 0 60px rgba(59, 130, 246, 0.1); }
  50% { box-shadow: 0 0 40px rgba(59, 130, 246, 0.5), 0 0 80px rgba(59, 130, 246, 0.2); }
}

.login-box h1 {
  text-align: center;
  margin-bottom: 6px;
  font-size: 18px;
  font-weight: 700;
  color: #ffffff;
  letter-spacing: 1px;
}

.login-box .subtitle {
  text-align: center;
  color: rgba(255,255,255,0.5);
  margin-bottom: 36px;
  font-size: 13px;
  letter-spacing: 4px;
  text-transform: uppercase;
}

.form-group {
  margin-bottom: 20px;
}

.login-box .form-group label {
  display: block;
  margin-bottom: 6px;
  font-size: 12px;
  font-weight: 600;
  color: rgba(255,255,255,0.7);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.login-box .form-group input {
  width: 100%;
  padding: 12px 16px;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(59, 130, 246, 0.3);
  border-radius: var(--radius);
  color: #ffffff;
  font-size: 14px;
  outline: none;
  transition: all 0.3s;
}

.login-box .form-group input::placeholder {
  color: rgba(255,255,255,0.4);
}

.login-box .form-group input:focus {
  border-color: var(--accent);
  background: rgba(59, 130, 246, 0.12);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2), 0 0 20px rgba(59, 130, 246, 0.1);
}

.login-box .form-group input::placeholder {
  color: rgba(255,255,255,0.4);
}

.login-box .form-group input:focus {
  border-color: var(--accent);
  background: rgba(59, 130, 246, 0.1);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

/* Main content form styles */
.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  margin-bottom: 6px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
}

.form-group input, .form-group select, .form-group textarea {
  width: 100%;
  padding: 10px 14px;
  background: var(--bg-input);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-size: 14px;
  outline: none;
  transition: all 0.3s;
}

.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  border-color: var(--accent);
  background: var(--bg-secondary);
  box-shadow: 0 0 0 3px var(--accent-light);
}

.form-group input, .form-group select, .form-group textarea {
  width: 100%;
  padding: 14px 16px;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: var(--radius);
  color: #ffffff;
  font-size: 14px;
  outline: none;
  transition: all 0.3s;
}

.form-group input::placeholder {
  color: rgba(255,255,255,0.3);
}

.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  border-color: var(--accent);
  background: rgba(59, 130, 246, 0.08);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.login-btn {
  width: 100%;
  padding: 14px;
  font-size: 14px;
  text-align: center;
  justify-content: center;
  letter-spacing: 4px;
  position: relative;
  overflow: hidden;
  background: var(--accent-gradient);
  color: white;
  border: none;
  border-radius: var(--radius);
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 4px 20px rgba(59, 130, 246, 0.4), 0 0 40px rgba(59, 130, 246, 0.15);
  transition: all 0.3s;
}

.login-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 30px rgba(59, 130, 246, 0.5), 0 0 50px rgba(59, 130, 246, 0.2);
}

.login-btn::after {
  content: '';
  position: absolute;
  top: 0; left: -100%;
  width: 100%; height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: left 0.6s;
}

.login-btn:hover::after {
  left: 100%;
}

.login-footer {
  text-align: center;
  margin-top: 28px;
  font-size: 11px;
  color: rgba(255,255,255,0.4);
  letter-spacing: 3px;
  text-transform: uppercase;
  text-shadow: 0 0 10px rgba(59, 130, 246, 0.3);
}

.error-msg {
  color: var(--danger);
  font-size: 13px;
  margin-top: 10px;
  text-align: center;
  padding: 10px;
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.2);
  border-radius: var(--radius);
}

/* ==================== BUTTONS ==================== */
.btn {
  padding: 10px 20px;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  transition: all 0.3s;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0; left: -100%;
  width: 100%; height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
  transition: left 0.5s;
}

.btn:hover::before { left: 100%; }

.btn-primary {
  background: var(--accent-gradient);
  color: white;
  box-shadow: 0 2px 12px rgba(59, 130, 246, 0.4), 0 0 20px rgba(59, 130, 246, 0.1);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(59, 130, 246, 0.5), 0 0 30px rgba(59, 130, 246, 0.15);
}

.btn-success {
  background: var(--success);
  color: white;
  box-shadow: 0 2px 12px rgba(16, 185, 129, 0.35), 0 0 15px rgba(16, 185, 129, 0.1);
}

.btn-danger {
  background: var(--danger);
  color: white;
  box-shadow: 0 2px 12px rgba(239, 68, 68, 0.35), 0 0 15px rgba(239, 68, 68, 0.1);
}

.btn-outline {
  background: rgba(59, 130, 246, 0.05);
  border: 1.5px solid rgba(59, 130, 246, 0.25);
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(10px);
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(59, 130, 246, 0.1);
  box-shadow: 0 0 15px rgba(59, 130, 246, 0.15), inset 0 0 15px rgba(59, 130, 246, 0.05);
}

.btn-sm {
  padding: 6px 14px;
  font-size: 12px;
  border-radius: 8px;
}

/* ==================== LAYOUT ==================== */
.app-layout {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: 260px;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0; left: 0; bottom: 0;
  z-index: 100;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.sidebar-header {
  padding: 24px 20px 20px;
  border-bottom: 1px solid var(--border);
  overflow: hidden;
  position: relative;
}

.sidebar-header::after {
  content: '';
  position: absolute;
  bottom: 0; left: 20px; right: 20px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0.3;
}

.sidebar-header h2 {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
  line-height: 1.4;
}

.sidebar-header .mqtt-status {
  font-size: 11px;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: var(--bg-primary);
  border-radius: 8px;
  margin-top: 8px;
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

.sidebar-header .mqtt-status .dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--danger);
  box-shadow: 0 0 6px rgba(239, 68, 68, 0.5);
}

.sidebar-header .mqtt-status .dot.connected {
  background: var(--success);
  box-shadow: 0 0 8px rgba(16, 185, 129, 0.6), 0 0 16px rgba(16, 185, 129, 0.3);
  animation: dotPulse 2s ease-in-out infinite;
}

@keyframes dotPulse {
  0%, 100% { box-shadow: 0 0 8px rgba(16, 185, 129, 0.6); }
  50% { box-shadow: 0 0 14px rgba(16, 185, 129, 0.8), 0 0 24px rgba(16, 185, 129, 0.3); }
}

.sidebar-nav {
  flex: 1;
  padding: 16px 12px;
  overflow-y: auto;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-radius: var(--radius);
  cursor: pointer;
  color: var(--text-secondary);
  transition: all 0.3s;
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 4px;
  border: 1px solid transparent;
  position: relative;
}

.nav-item span:first-child {
  width: 24px; text-align: center;
  font-size: 18px;
}

.nav-item:hover {
  background: var(--accent-light);
  color: var(--accent);
  border-color: rgba(59, 130, 246, 0.15);
}

.nav-item.active {
  background: var(--accent-gradient);
  color: #ffffff;
  border: 1px solid transparent;
  box-shadow: 0 2px 10px rgba(59, 130, 246, 0.3);
}

.nav-item.active::before {
  content: '';
  position: absolute;
  left: 0; top: 20%; bottom: 20%;
  width: 3px;
  border-radius: 0 3px 3px 0;
  background: white;
  box-shadow: 0 0 6px rgba(255, 255, 255, 0.5);
}

.sidebar-footer {
  padding: 16px 20px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-secondary);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--bg-primary);
}

.sidebar-footer .logout-btn {
  background: none; border: 1px solid var(--danger-bg);
  color: var(--danger);
  cursor: pointer; font-size: 13px;
  padding: 6px 14px; border-radius: 8px;
  transition: all 0.3s; font-weight: 500;
}

.sidebar-footer .logout-btn:hover {
  color: var(--danger);
  background: var(--danger-bg);
  border-color: var(--danger);
}

.main-content {
  flex: 1;
  margin-left: 260px;
  padding: 24px;
  background: var(--bg-primary);
  position: relative;
  min-height: 100vh;
}

.main-content::before {
  content: '';
  position: fixed;
  top: 0; left: 260px; right: 0; bottom: 0;
  background-image:
    radial-gradient(circle at 20% 50%, rgba(59, 130, 246, 0.04) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(14, 165, 233, 0.04) 0%, transparent 50%),
    radial-gradient(circle at 50% 80%, rgba(59, 130, 246, 0.03) 0%, transparent 40%);
  pointer-events: none;
  z-index: 0;
}

/* Animated scan line across main content */
.main-content::after {
  content: '';
  position: fixed;
  top: 0; left: 260px; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(59, 130, 246, 0.15), transparent);
  animation: mainScan 6s ease-in-out infinite;
  pointer-events: none;
  z-index: 0;
}

@keyframes mainScan {
  0% { top: 0; opacity: 0; }
  5% { opacity: 1; }
  95% { opacity: 1; }
  100% { top: 100%; opacity: 0; }
}

.page-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  position: relative;
  z-index: 1;
}

.page-header h1 {
  font-size: 22px; font-weight: 800;
  color: var(--text-primary);
  text-shadow: 0 0 20px rgba(59, 130, 246, 0.1);
}

/* ==================== STAT CARDS ==================== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-bottom: 20px;
  position: sticky;
  top: 0;
  z-index: 50;
  padding: 12px 0;
  background: transparent;
}

.stat-card {
  background: var(--bg-card);
  padding: 18px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  transition: all 0.4s;
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; height: 3px;
  background: var(--accent-gradient);
}

.stat-card::after {
  content: '';
  position: absolute;
  top: -50%; left: -50%;
  width: 200%; height: 200%;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.05) 0%, transparent 70%);
  opacity: 0;
  transition: opacity 0.4s;
}

.stat-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(59, 130, 246, 0.12), 0 0 30px rgba(59, 130, 246, 0.05);
  border-color: rgba(59, 130, 246, 0.3);
}

.stat-card:hover::after { opacity: 1; }

.stat-card .label {
  font-size: 11px;
  color: var(--text-secondary);
  margin-bottom: 4px; font-weight: 500;
  letter-spacing: 0.5px;
}

.stat-card .value { font-size: 20px; font-weight: 800; color: var(--text-primary); position: relative; z-index: 1; }
.stat-card .value.success { color: var(--success); text-shadow: 0 0 20px rgba(16, 185, 129, 0.3); }
.stat-card .value.warning { color: var(--warning); text-shadow: 0 0 20px rgba(245, 158, 11, 0.3); }

/* ==================== TABLE ==================== */
.table-container {
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(20px);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(59, 130, 246, 0.12);
  overflow: hidden;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
}

.table-container table { width: 100%; border-collapse: collapse; }

.table-container th, .table-container td {
  padding: 16px 18px;
  text-align: left;
  border-bottom: 1px solid rgba(59, 130, 246, 0.08);
  font-size: 14px;
}

.table-container th {
  background: rgba(59, 130, 246, 0.06);
  color: var(--text-secondary);
  font-weight: 600; font-size: 12px;
  text-transform: uppercase; letter-spacing: 0.5px;
  white-space: nowrap;
  border-bottom: 2px solid rgba(59, 130, 246, 0.15);
}

.table-container tr:last-child td { border-bottom: none; }
.table-container tr:hover td {
  background: rgba(59, 130, 246, 0.04);
  box-shadow: inset 0 0 30px rgba(59, 130, 246, 0.02);
}
.table-container td { vertical-align: top; word-break: break-word; white-space: nowrap; }

.badge {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 4px 12px; border-radius: 20px;
  font-size: 12px; font-weight: 600;
}

.badge-success { background: var(--success-bg); color: var(--success); }
.badge-danger { background: var(--danger-bg); color: var(--danger); }
.badge-info { background: var(--accent-light); color: var(--accent); }

/* ==================== MODAL ==================== */
.modal-overlay {
  position: fixed; top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(12px);
  display: flex; justify-content: center; align-items: center;
  z-index: 200;
  animation: fadeIn 0.2s ease;
}

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

.modal {
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(30px);
  border-radius: var(--radius-xl);
  padding: 32px; width: 90%; max-width: 520px;
  max-height: 80vh; overflow-y: auto;
  border: 1px solid rgba(59, 130, 246, 0.15);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2), 0 0 40px rgba(59, 130, 246, 0.08);
  animation: slideUp 0.3s ease;
  color: var(--text-primary);
  position: relative;
}

.modal::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; height: 3px;
  background: var(--accent-gradient);
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}

.modal h2 {
  margin-bottom: 24px; font-size: 18px; font-weight: 700;
  color: var(--text-primary);
}

.modal .form-group label {
  color: var(--text-primary);
}

.modal .form-group input,
.modal .form-group select,
.modal .form-group textarea {
  color: var(--text-primary);
  background: var(--bg-input);
  border: 1.5px solid var(--border);
}

.modal .form-group input:focus,
.modal .form-group select:focus,
.modal .form-group textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}

.modal p,
.modal div,
.modal span,
.modal strong,
.modal td,
.modal th {
  color: var(--text-primary);
}

@keyframes slideUp {
  from { transform: translateY(20px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.modal h2 {
  margin-bottom: 24px; font-size: 18px; font-weight: 700;
  color: var(--text-primary);
}

.modal-actions {
  display: flex; gap: 10px;
  justify-content: center; margin-top: 20px;
  align-items: center;
  border-top: 1px solid var(--border);
  padding-top: 16px;
}

.modal-actions .btn {
  min-width: 100px;
  height: 40px;
  text-align: center;
  justify-content: center;
}

/* Form submit button inside modal */
.modal .form-group + .btn-primary,
.modal .form-group ~ .btn-primary {
  margin-top: 8px;
}

/* ==================== DEVICE CARD ==================== */
.device-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(480px, 1fr));
  gap: 16px;
  position: relative;
  z-index: 1;
}

.device-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  padding: 18px;
  box-shadow: var(--shadow);
  transition: all 0.4s;
  position: relative;
  overflow: hidden;
}

.device-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; height: 2px;
  background: var(--accent-gradient);
  opacity: 0;
  transition: opacity 0.4s;
}

.device-card::after {
  content: '';
  position: absolute;
  top: 0; left: -100%;
  width: 50%; height: 100%;
  background: linear-gradient(90deg, transparent, rgba(59, 130, 246, 0.03), transparent);
  transition: left 0.8s;
  pointer-events: none;
}

.device-card:hover {
  box-shadow: 0 8px 30px rgba(59, 130, 246, 0.12), 0 0 40px rgba(59, 130, 246, 0.05);
  transform: translateY(-3px);
  border-color: rgba(59, 130, 246, 0.3);
}

.device-card:hover::before { opacity: 1; }
.device-card:hover::after { left: 100%; }

.device-card .device-header {
  display: flex; justify-content: space-between;
  align-items: flex-start; margin-bottom: 10px;
}

.device-card .device-name {
  font-size: 15px; font-weight: 700;
  color: var(--text-primary);
}

.device-card .device-topic {
  font-size: 11px; color: var(--text-secondary);
  margin-top: 3px;
  font-family: 'SF Mono', Monaco, monospace;
  background: var(--bg-primary); padding: 3px 8px;
  border-radius: 6px; display: inline-block;
  border: 1px solid var(--border);
}

.device-card .device-data {
  background: var(--bg-primary);
  border-radius: var(--radius); padding: 12px;
  margin: 10px 0; font-size: 12px;
  line-height: 1.5; border: 1px solid var(--border);
  min-height: 50px;
  position: relative;
}

.device-card .device-data::after {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0.2;
}

.device-card .device-data.empty {
  color: var(--text-secondary); font-style: italic;
  display: flex; align-items: center; justify-content: center;
}

.device-card .device-actions {
  display: flex; flex-wrap: wrap;
  gap: 6px; margin-top: 10px;
}

.device-card .device-actions .btn {
  font-size: 11px; padding: 5px 12px; border-radius: 6px;
}

.device-card .last-seen {
  font-size: 10px; color: var(--text-secondary);
  margin-top: 8px;
}

.device-card {
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(20px);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(59, 130, 246, 0.12);
  padding: 18px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  transition: all 0.4s;
  position: relative;
  overflow: hidden;
}

.device-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; height: 2px;
  background: var(--accent-gradient);
  opacity: 0;
  transition: opacity 0.4s;
}

.device-card:hover {
  box-shadow: 0 8px 30px rgba(59, 130, 246, 0.12), 0 0 40px rgba(59, 130, 246, 0.05);
  transform: translateY(-3px);
  border-color: rgba(59, 130, 246, 0.25);
}

.device-card:hover::before { opacity: 1; }

.device-card .device-header {
  display: flex; justify-content: space-between;
  align-items: flex-start; margin-bottom: 10px;
}

.device-card .device-name {
  font-size: 15px; font-weight: 700;
  color: var(--text-primary);
}

.device-card .device-topic {
  font-size: 11px; color: var(--text-secondary);
  margin-top: 3px;
  font-family: 'SF Mono', Monaco, monospace;
  background: rgba(59, 130, 246, 0.06); padding: 3px 8px;
  border-radius: 6px; display: inline-block;
  border: 1px solid rgba(59, 130, 246, 0.12);
}

.device-card .device-data {
  background: rgba(59, 130, 246, 0.04);
  border-radius: var(--radius); padding: 12px;
  margin: 10px 0; font-size: 12px;
  line-height: 1.5; border: 1px solid rgba(59, 130, 246, 0.08);
  min-height: 50px;
  position: relative;
  overflow: hidden;
}

.device-card .device-data::after {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(59, 130, 246, 0.2), transparent);
}

.device-card .device-data.empty {
  color: var(--text-secondary); font-style: italic;
  display: flex; align-items: center; justify-content: center;
}

.device-card .device-actions {
  display: flex; flex-wrap: wrap;
  gap: 6px; margin-top: 10px;
}

.device-card .device-actions .btn {
  font-size: 11px; padding: 5px 12px; border-radius: 6px;
}

.device-card .last-seen {
  font-size: 10px; color: var(--text-secondary);
  margin-top: 8px;
}

/* ==================== PAGINATION ==================== */
.pagination {
  display: flex; gap: 6px;
  justify-content: center; margin-top: 20px;
}

.pagination .btn { border-radius: 8px; min-width: 36px; }

/* ==================== CONFIG ==================== */
.config-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 18px;
  position: relative;
  z-index: 1;
}

.config-card {
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(20px);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(59, 130, 246, 0.12);
  padding: 20px; box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  color: var(--text-primary);
  position: relative;
  overflow: hidden;
}

.config-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; height: 2px;
  background: var(--accent-gradient);
}

.config-card h3 {
  font-size: 15px; margin-bottom: 16px; font-weight: 700;
  color: var(--text-primary);
}

.config-card p {
  color: var(--text-secondary);
}

.config-card .form-group label {
  color: var(--text-primary);
}

.config-card .form-group input,
.config-card .form-group select,
.config-card .form-group textarea {
  color: var(--text-primary);
  background: var(--bg-input);
  border-color: var(--border);
}

.config-card .form-group textarea {
  color: var(--text-primary);
  background: var(--bg-input);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 14px;
  font-size: 14px;
  resize: vertical;
}

.checkbox-group {
  display: flex; flex-direction: column;
  gap: 4px; max-height: 300px;
  overflow-y: auto; padding: 10px;
  background: var(--bg-input);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.checkbox-group label {
  display: flex; align-items: center;
  gap: 10px; font-size: 13px;
  cursor: pointer; padding: 8px 12px;
  border-radius: 8px; transition: background 0.2s;
  color: var(--text-primary);
}

.checkbox-group label:hover { background: var(--bg-secondary); }

/* ==================== TOAST ==================== */
.toast {
  position: fixed; bottom: 28px; right: 28px;
  padding: 14px 24px; border-radius: var(--radius);
  font-size: 14px; font-weight: 600;
  z-index: 300; animation: slideIn 0.3s ease;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.2), 0 0 20px rgba(59, 130, 246, 0.1);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.toast-success { background: rgba(16, 185, 129, 0.9); color: white; }
.toast-error { background: rgba(239, 68, 68, 0.9); color: white; }

@keyframes slideIn {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

.hidden { display: none !important; }

/* ==================== MODBUS ==================== */
.modbus-record-grid {
  display: flex; flex-wrap: wrap; gap: 4px;
}

.modbus-record-item {
  font-size: 11px; white-space: nowrap;
  padding: 3px 8px; background: var(--bg-input);
  border-radius: 6px; display: inline-flex;
  gap: 6px; min-width: 160px;
  border: 1px solid var(--border);
}

.modbus-record-label {
  color: var(--text-secondary); font-size: 10px;
}

.modbus-card-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 0;
}

.modbus-card-item {
  display: flex; justify-content: space-between;
  align-items: center; font-size: 12px;
  padding: 5px 8px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-secondary);
  border-radius: 6px; margin: 1px;
}

.modbus-card-label {
  color: var(--text-secondary); font-size: 11px;
  white-space: nowrap; overflow: hidden;
  text-overflow: ellipsis; max-width: 55%;
}

.modbus-card-value {
  font-weight: 700; text-align: right;
  color: var(--text-primary); font-size: 12px;
}

.table-container th:nth-child(3),
.table-container td:nth-child(3) { width: 60%; }

/* ==================== RESPONSIVE ==================== */
@media (max-width: 768px) {
  .sidebar { width: 60px; }
  .sidebar-header h2, .sidebar-header .mqtt-status span,
  .nav-item span:last-child, .sidebar-footer .logout-btn { display: none; }
  .nav-item { justify-content: center; padding: 12px; }
  .nav-item.active::before { display: none; }
  .main-content { margin-left: 60px; padding: 16px; }
  .main-content::before, .main-content::after { left: 60px; }
  .device-grid { grid-template-columns: 1fr; }
}

.dark .sidebar { background: linear-gradient(180deg, #0f172a 0%, #0c1424 100%); }
.dark .sidebar-header { background: rgba(59, 130, 246, 0.05); border-bottom-color: #1e293b; }
.dark .sidebar-header::after { background: linear-gradient(90deg, transparent, rgba(59, 130, 246, 0.4), transparent); }
.dark .sidebar-header .mqtt-status { background: #0f172a; border-color: #334155; }
.dark .sidebar-footer { background: #0f172a; border-top-color: #1e293b; }
.dark .sidebar-footer .logout-btn { border-color: rgba(239, 68, 68, 0.3); color: #fca5a5; }
.dark .sidebar-footer .logout-btn:hover { background: rgba(239, 68, 68, 0.15); border-color: rgba(239, 68, 68, 0.5); }

/* ==================== DARK MODE ==================== */
.dark {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-card: #1e293b;
  --bg-input: #334155;
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --border: #334155;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.4);
  --shadow: 0 1px 3px rgba(0,0,0,0.5);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.5);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.6);
  --shadow-xl: 0 20px 25px rgba(0,0,0,0.7);
  --accent-light: rgba(59,130,246,0.2);
  --success-bg: rgba(16,185,129,0.2);
  --danger-bg: rgba(239,68,68,0.2);
  --warning-bg: rgba(245,158,11,0.2);
}

.dark * {
  color: var(--text-primary);
}

.dark .text-secondary,
.dark .last-seen,
.dark .sidebar-header .mqtt-status span,
.dark .modbus-record-label,
.dark .modbus-card-label,
.dark p[style*="text-secondary"],
.dark div[style*="text-secondary"] {
  color: #94a3b8 !important;
}

.dark .badge-success { background: var(--success-bg); color: #34d399; }
.dark .badge-danger { background: var(--danger-bg); color: #fca5a5; }
.dark .badge-info { background: var(--accent-light); color: #60a5fa; }

.dark .login-box {
  background: rgba(15, 23, 42, 0.95);
  border-color: rgba(59, 130, 246, 0.25);
}

.dark .sidebar {
  background: linear-gradient(180deg, #0f172a 0%, #0c1424 100%);
  border-right-color: #1e293b;
}

.dark .sidebar-header {
  background: rgba(59, 130, 246, 0.05);
  border-bottom-color: #1e293b;
}

.dark .sidebar-header::after {
  background: linear-gradient(90deg, transparent, rgba(59, 130, 246, 0.4), transparent);
}

.dark .sidebar-header .mqtt-status {
  background: #0f172a;
  border-color: #334155;
  color: #94a3b8;
}

.dark .sidebar-footer {
  background: #0f172a;
  border-top-color: #1e293b;
}

.dark .sidebar-footer .logout-btn {
  border-color: rgba(239, 68, 68, 0.3);
  color: #fca5a5;
}

.dark .sidebar-footer .logout-btn:hover {
  background: rgba(239, 68, 68, 0.15);
  border-color: rgba(239, 68, 68, 0.5);
}

.dark .nav-item:hover {
  background: rgba(59, 130, 246, 0.12);
  color: #e2e8f0;
}

.dark .nav-item.active {
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.25) 0%, rgba(14, 165, 233, 0.25) 100%);
  border-color: rgba(59, 130, 246, 0.4);
  color: #ffffff;
  box-shadow: 0 0 20px rgba(59, 130, 246, 0.2);
}

.dark .main-content {
  background: #0f172a;
}

.dark .main-content::before {
  background-image:
    radial-gradient(circle at 20% 50%, rgba(59, 130, 246, 0.06) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(14, 165, 233, 0.06) 0%, transparent 50%),
    radial-gradient(circle at 50% 80%, rgba(59, 130, 246, 0.04) 0%, transparent 40%);
}

.dark .main-content::after {
  background: linear-gradient(90deg, transparent, rgba(59, 130, 246, 0.2), transparent);
}

.dark .stat-card,
.dark .device-card,
.dark .config-card,
.dark .table-container {
  background: #1e293b;
  border-color: #334155;
}

.dark .stat-card:hover,
.dark .device-card:hover {
  border-color: rgba(59, 130, 246, 0.4);
  box-shadow: 0 8px 30px rgba(59, 130, 246, 0.15), 0 0 40px rgba(59, 130, 246, 0.08);
}

.dark .table-container th {
  background: #0f172a;
  border-bottom-color: #334155;
  color: #94a3b8;
}

.dark .table-container tr:hover td {
  background: rgba(59, 130, 246, 0.08);
}

.dark .modal {
  background: #1e293b;
  border-color: #334155;
}

.dark .modal::before {
  background: var(--accent-gradient);
}

.dark .modal .form-group label {
  color: #e2e8f0;
}

.dark .modal .form-group input,
.dark .modal .form-group select,
.dark .modal .form-group textarea {
  background: #0f172a;
  border-color: #475569;
  color: #f8fafc !important;
}

.dark .form-group input,
.dark .form-group select,
.dark .form-group textarea {
  background: #0f172a;
  border-color: #475569;
  color: #f8fafc !important;
}

.dark .form-group input:focus,
.dark .form-group select:focus,
.dark .form-group textarea:focus {
  border-color: var(--accent);
  background: rgba(59, 130, 246, 0.08);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2), 0 0 15px rgba(59, 130, 246, 0.1);
  color: #f8fafc;
}

.dark .btn-outline {
  background: #1e293b;
  border-color: #475569;
  color: #e2e8f0;
}

.dark .btn-outline:hover {
  background: rgba(59, 130, 246, 0.15);
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: 0 0 15px rgba(59, 130, 246, 0.2);
}

.dark .checkbox-group {
  background: #0f172a;
  border-color: #334155;
}

.dark .checkbox-group label:hover {
  background: rgba(59, 130, 246, 0.1);
}

.dark .modbus-record-item {
  background: #0f172a;
  border-color: #334155;
}

.dark .device-card .device-data {
  background: #0f172a;
  border-color: #334155;
}

.dark .device-card .device-topic {
  background: #0f172a;
  border-color: #475569;
  color: #94a3b8;
}

.dark .sidebar-header .mqtt-status {
  background: rgba(59, 130, 246, 0.1);
  border-color: rgba(59, 130, 246, 0.15);
}

.dark .sidebar-header h2,
.dark .sidebar-header div[style*="font-weight:700"] {
  color: #f8fafc !important;
}

.dark .page-header h1 {
  color: #f8fafc;
  text-shadow: 0 0 20px rgba(59, 130, 246, 0.2);
}

.dark .page-header .btn {
  color: #e2e8f0;
}

.dark .modal h2 {
  color: #f8fafc;
}

.dark .config-card h3 {
  color: #f8fafc;
}

.dark .config-card p {
  color: #94a3b8;
}

.dark .modal-actions {
  border-top-color: #334155;
}

.dark .toast {
  background: #1e293b;
  border-color: #334155;
}

.dark .toast-success { background: rgba(16, 185, 129, 0.9); }
.dark .toast-error { background: rgba(239, 68, 68, 0.9); }

/* Dark mode toggle button */
.dark-mode-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  font-size: 13px;
  color: var(--text-secondary);
  transition: all 0.2s;
}

.dark-mode-toggle:hover {
  background: var(--bg-card);
  color: var(--text-primary);
}

.dark-mode-toggle .toggle-icon {
  font-size: 16px;
}