/* ===== TP-Link Omada Style – Modern Edition ===== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

:root {
  --bg-primary: #0a0f16;
  --bg-secondary: #111a24;
  --bg-card: rgba(22, 34, 48, 0.75);
  --bg-card-hover: rgba(28, 44, 62, 0.85);
  --bg-input: #1a2a3a;
  --border-color: rgba(42, 64, 82, 0.4);
  --border-active: rgba(0, 170, 255, 0.3);

  --text-primary: #ecf1f5;
  --text-secondary: #8899aa;
  --text-muted: #4a5a6a;

  --accent: #00aaff;
  --accent-hover: #44ccff;
  --accent-dim: rgba(0, 170, 255, 0.12);
  --accent-glow: rgba(0, 170, 255, 0.25);

  --green: #00c853;
  --green-dim: rgba(0, 200, 83, 0.12);
  --orange: #ff9100;
  --orange-dim: rgba(255, 145, 0, 0.12);
  --red: #ff1744;
  --red-dim: rgba(255, 23, 68, 0.12);
  --purple: #7c4dff;
  --purple-dim: rgba(124, 77, 255, 0.12);

  --radius: 8px;
  --radius-lg: 14px;
  --radius-xl: 20px;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --glass: rgba(22, 34, 48, 0.6);
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

/* ===== Subtle background pattern ===== */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(0, 170, 255, 0.03) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(124, 77, 255, 0.02) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 80%, rgba(0, 200, 83, 0.02) 0%, transparent 50%);
  pointer-events: none;
  z-index: 0;
}

.app-container {
  position: relative;
  z-index: 1;
  max-width: 1400px;
  margin: 0 auto;
  padding: 24px 28px;
}

/* ===== Top Navigation Bar ===== */
.topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 28px;
  background: rgba(15, 22, 30, 0.85);
  backdrop-filter: blur(16px) saturate(1.4);
  -webkit-backdrop-filter: blur(16px) saturate(1.4);
  border-bottom: 1px solid var(--border-color);
}

.topbar-brand {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 17px;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: -0.3px;
}

.topbar-brand .logo {
  width: 34px;
  height: 34px;
  background: linear-gradient(135deg, var(--accent), var(--purple));
  border-radius: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 14px;
  color: #fff;
  box-shadow: 0 0 20px rgba(0, 170, 255, 0.2);
}

/* ===== Page Header ===== */
.page-header {
  margin-bottom: 28px;
  padding: 8px 0;
}

.page-header h1 {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, var(--text-primary), var(--text-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.page-header .subtitle {
  color: var(--text-secondary);
  font-size: 14px;
  margin-top: 4px;
  font-weight: 400;
}

/* ===== Date / Range Selector ===== */
.range-selector {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 24px;
  padding: 16px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(8px);
}

.range-btn {
  padding: 8px 16px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  background: transparent;
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
}

.range-btn:hover {
  background: var(--accent-dim);
  color: var(--accent);
}

.range-btn.active {
  background: var(--accent-dim);
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: 0 0 12px rgba(0, 170, 255, 0.1);
}

.range-divider {
  width: 1px;
  height: 24px;
  background: var(--border-color);
}

.range-date-input {
  padding: 7px 12px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-size: 13px;
  font-family: inherit;
  transition: all var(--transition);
}

.range-date-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-dim);
}

/* ===== Stats Cards ===== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 14px;
  margin-bottom: 24px;
}

.stat-card {
  position: relative;
  overflow: hidden;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 22px 24px;
  transition: all var(--transition);
  backdrop-filter: blur(8px);
}

.stat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--border-active), transparent);
  opacity: 0;
  transition: opacity var(--transition);
}

.stat-card:hover {
  border-color: var(--border-active);
  box-shadow: var(--shadow);
  transform: translateY(-2px);
  background: var(--bg-card-hover);
}

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

.stat-card.accent {
  border-color: rgba(0, 170, 255, 0.2);
  background: linear-gradient(135deg, var(--bg-card), rgba(0, 170, 255, 0.06));
}

.stat-card.accent::before {
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 1;
}

.stat-card .stat-icon {
  position: absolute;
  top: 14px;
  right: 16px;
  font-size: 22px;
  opacity: 0.2;
}

.stat-card .stat-label {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.stat-card .stat-value {
  font-size: 34px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.1;
  letter-spacing: -0.5px;
}

.stat-card .stat-unit {
  font-size: 15px;
  font-weight: 400;
  color: var(--text-secondary);
  margin-left: 3px;
}

.stat-card.accent .stat-value {
  color: var(--accent);
}

.stat-card .stat-footer {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 6px;
}

.stat-card .stat-change {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  font-weight: 600;
  margin-top: 4px;
}

.stat-change.up { color: var(--green); }
.stat-change.down { color: var(--red); }
.stat-change.neutral { color: var(--text-muted); }

/* ===== Chart Containers ===== */
.chart-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 28px;
}

@media (max-width: 1100px) {
  .chart-grid {
    grid-template-columns: 1fr;
  }
}

.chart-container {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 22px;
  backdrop-filter: blur(8px);
  transition: border-color var(--transition);
}

.chart-container:hover {
  border-color: var(--border-active);
}

.chart-container.full-width {
  grid-column: 1 / -1;
}

.chart-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
}

.chart-header-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.chart-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.chart-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.6px;
}

.chart-legend {
  display: flex;
  align-items: center;
  gap: 14px;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  color: var(--text-muted);
}

.legend-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
}

.chart-body {
  position: relative;
  width: 100%;
  min-height: 220px;
}

.chart-body canvas {
  width: 100% !important;
}

/* ===== Loading shimmer ===== */
@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

.shimmer {
  background: linear-gradient(90deg,
    var(--bg-card) 25%,
    var(--bg-card-hover) 50%,
    var(--bg-card) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s ease-in-out infinite;
  border-radius: var(--radius);
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  background: var(--bg-input);
  color: var(--text-primary);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  font-family: inherit;
}

.btn:hover {
  background: var(--bg-hover, var(--bg-card-hover));
  border-color: var(--border-active);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), #0088cc);
  border-color: var(--accent);
  color: #fff;
  font-weight: 600;
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--accent-hover), var(--accent));
  box-shadow: 0 0 20px rgba(0, 170, 255, 0.3);
}

.btn-danger {
  background: transparent;
  border-color: var(--red);
  color: var(--red);
}

.btn-danger:hover {
  background: var(--red-dim);
}

.btn-sm {
  padding: 5px 10px;
  font-size: 12px;
}

/* ===== Forms ===== */
.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.4px;
}

.form-control {
  width: 100%;
  padding: 10px 14px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-size: 14px;
  font-family: inherit;
  transition: all var(--transition);
}

.form-control:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-dim);
}

.form-control::placeholder {
  color: var(--text-muted);
}

/* ===== Table ===== */
.table-container {
  overflow-x: auto;
}

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

table th,
table td {
  padding: 10px 14px;
  text-align: left;
  border-bottom: 1px solid rgba(42, 64, 82, 0.3);
  font-size: 13px;
}

table th {
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.6px;
}

table tbody tr {
  transition: background var(--transition);
}

table tbody tr:hover {
  background: rgba(0, 170, 255, 0.04);
}

/* ===== Alert ===== */
.alert {
  padding: 12px 16px;
  border-radius: var(--radius);
  font-size: 13px;
  margin-bottom: 16px;
  display: none;
}

.alert-success {
  display: block;
  background: var(--green-dim);
  border: 1px solid rgba(0, 200, 83, 0.3);
  color: var(--green);
}

.alert-error {
  display: block;
  background: var(--red-dim);
  border: 1px solid rgba(255, 23, 68, 0.3);
  color: var(--red);
}

/* ===== Empty State ===== */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-muted);
}

.empty-state .icon {
  font-size: 48px;
  margin-bottom: 16px;
  opacity: 0.4;
}

.empty-state h3 {
  font-size: 18px;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

/* ===== Loading Spinner ===== */
.spinner {
  display: inline-block;
  width: 18px;
  height: 18px;
  border: 2px solid var(--border-color);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ===== Fade-in animation ===== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeInUp 0.4s ease-out forwards;
}

.fade-in-delay-1 { animation-delay: 0.05s; }
.fade-in-delay-2 { animation-delay: 0.10s; }
.fade-in-delay-3 { animation-delay: 0.15s; }
.fade-in-delay-4 { animation-delay: 0.20s; }
.fade-in-delay-5 { animation-delay: 0.25s; }

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .app-container {
    padding: 12px;
  }

  .topbar {
    padding: 12px 16px;
  }

  .topbar-brand span {
    display: none;
  }

  .stats-grid {
    grid-template-columns: 1fr 1fr;
  }

  .stat-card .stat-value {
    font-size: 26px;
  }

  .range-selector {
    gap: 6px;
    padding: 12px;
  }
}

@media (max-width: 480px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }
}