:root {
  --bg: #07090e;
  --surface: #0f131a;
  --surface-card: #121824;
  --surface-hover: #1b2333;
  --border: rgba(255, 255, 255, 0.06);
  --border-focus: rgba(99, 102, 241, 0.4);
  --text: #f3f4f6;
  --muted: #8e9cae;
  
  --accent: #6366f1;
  --accent-gradient: linear-gradient(135deg, #6366f1 0%, #4f46e5 100%);
  --accent-glow: rgba(99, 102, 241, 0.25);
  
  --ok: #10b981;
  --ok-bg: rgba(16, 185, 129, 0.08);
  --ok-border: rgba(16, 185, 129, 0.2);
  
  --warn: #f59e0b;
  --warn-bg: rgba(245, 158, 11, 0.08);
  --warn-border: rgba(245, 158, 11, 0.2);
  
  --bad: #ef4444;
  --bad-bg: rgba(239, 68, 68, 0.08);
  --bad-border: rgba(239, 68, 68, 0.2);
  
  --font: "Plus Jakarta Sans", "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --transition-smooth: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* Base resets & styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font);
  background: radial-gradient(circle at 50% 0%, #151a2d 0%, var(--bg) 70%);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: var(--transition-smooth);
}
a:hover {
  color: #818cf8;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg);
}
::-webkit-scrollbar-thumb {
  background: #1e2638;
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: #2b3650;
}

/* Topbar Header */
.topbar {
  background: rgba(15, 19, 26, 0.75);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  transition: var(--transition-smooth);
}

.topbar-inner {
  max-width: 1300px;
  margin: 0 auto;
  padding: 0.85rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1.5rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 800;
  font-size: 1.2rem;
  letter-spacing: -0.02em;
  color: var(--text);
  transition: var(--transition-spring);
}
.brand:hover {
  transform: translateY(-1px);
}
.brand-icon {
  color: var(--accent);
  stroke-width: 2.5;
}

.topbar nav {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.topbar nav a {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--muted);
  padding: 0.55rem 0.85rem;
  border-radius: 8px;
  font-weight: 500;
  font-size: 0.9rem;
  transition: var(--transition-smooth);
}

.topbar nav a i {
  width: 16px;
  height: 16px;
  stroke-width: 2.2;
}

.topbar nav a:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.04);
}

.topbar nav a.active {
  color: var(--accent);
  background: rgba(99, 102, 241, 0.08);
  font-weight: 600;
}

.logout-btn {
  margin-left: 0.5rem;
}
.logout-btn:hover {
  background: rgba(239, 68, 68, 0.08) !important;
  color: var(--bad) !important;
}

/* Layout Container */
.container {
  max-width: 1300px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

h1 {
  font-size: 1.85rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 0.25rem;
  background: linear-gradient(135deg, #fff 40%, var(--muted) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

h2 {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 2.5rem 0 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text);
}

.muted {
  color: var(--muted);
  font-size: 0.9rem;
}

/* Stats Cards Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0 2rem;
}

.stat {
  background: var(--surface-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.2rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  transition: var(--transition-spring);
  position: relative;
  overflow: hidden;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

.stat::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: transparent;
  transition: var(--transition-smooth);
}

.stat:hover {
  transform: translateY(-3px);
  border-color: rgba(255, 255, 255, 0.12);
  box-shadow: 0 12px 20px -8px rgba(0, 0, 0, 0.3);
  background: var(--surface-hover);
}

.stat:hover::before {
  background: var(--accent-gradient);
}

.stat-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.stat-header i {
  width: 16px;
  height: 16px;
  stroke-width: 2.2;
}

.stat-header i.ok { color: var(--ok); }
.stat-header i.warn { color: var(--warn); }
.stat-header i.bad { color: var(--bad); }

.stat-label {
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.stat-value {
  font-size: 1.85rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text);
}

.stat-value.ok { color: var(--ok); text-shadow: 0 0 12px rgba(16, 185, 129, 0.15); }
.stat-value.warn { color: var(--warn); text-shadow: 0 0 12px rgba(245, 158, 11, 0.15); }
.stat-value.bad { color: var(--bad); text-shadow: 0 0 12px rgba(239, 68, 68, 0.15); }

/* Table styling */
.table-container {
  background: var(--surface-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  margin-bottom: 2rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  text-align: left;
}

th, td {
  padding: 0.9rem 1.1rem;
  border-bottom: 1px solid var(--border);
}

th {
  background: rgba(255, 255, 255, 0.01);
  color: var(--muted);
  font-weight: 700;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

tr:last-child td {
  border-bottom: none;
}

tr {
  transition: var(--transition-smooth);
}

tr:hover td {
  background: rgba(255, 255, 255, 0.015);
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.82rem;
  background: rgba(255, 255, 255, 0.05);
  padding: 0.2rem 0.4rem;
  border-radius: 6px;
  color: #d1d5db;
  border: 1px solid rgba(255, 255, 255, 0.03);
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.25rem 0.6rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  border: 1px solid transparent;
}
.badge.ok {
  background: var(--ok-bg);
  color: var(--ok);
  border-color: var(--ok-border);
}
.badge.warn {
  background: var(--warn-bg);
  color: var(--warn);
  border-color: var(--warn-border);
}
.badge.bad {
  background: var(--bad-bg);
  color: var(--bad);
  border-color: var(--bad-border);
}
.badge.secondary {
  background: rgba(255, 255, 255, 0.04);
  color: var(--muted);
  border-color: rgba(255, 255, 255, 0.05);
}

/* Layout Utilities */
.row-between {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}

.filters {
  display: flex;
  gap: 0.85rem;
  flex-wrap: wrap;
  align-items: flex-end;
  background: var(--surface-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem;
  margin-bottom: 1.5rem;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.stack {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  max-width: 420px;
}

label {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
}

/* Forms & Inputs */
input, select, textarea {
  font-family: inherit;
  font-size: 0.95rem;
  padding: 0.65rem 0.9rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #090c12;
  color: var(--text);
  outline: none;
  transition: var(--transition-smooth);
  width: 100%;
}

input:focus, select:focus, textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

input::placeholder, textarea::placeholder {
  color: rgba(255, 255, 255, 0.25);
}

/* Custom Checkbox / File Inputs */
input[type="file"] {
  background: transparent;
  border: 1px dashed var(--border);
  padding: 1rem;
  cursor: pointer;
  text-align: center;
}
input[type="file"]:hover {
  border-color: rgba(99, 102, 241, 0.5);
  background: rgba(255, 255, 255, 0.01);
}

/* Buttons with satisfying micro-animations */
button, .button-link {
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.65rem 1.1rem;
  border-radius: 8px;
  border: 1px solid transparent;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: var(--transition-smooth);
  user-select: none;
}

/* Satisfying click effect */
button:active, .button-link:active {
  transform: scale(0.96);
}

button {
  background: var(--accent-gradient);
  color: #ffffff;
  box-shadow: 0 4px 12px var(--accent-glow);
}

button:hover {
  filter: brightness(1.15);
  box-shadow: 0 6px 16px rgba(99, 102, 241, 0.35);
  transform: translateY(-1px);
}

button.secondary, .button-link.secondary {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  color: var(--text);
  box-shadow: none;
}
button.secondary:hover, .button-link.secondary:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.15);
  transform: translateY(-1px);
}

button.danger {
  background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
  box-shadow: 0 4px 12px rgba(239, 68, 68, 0.2);
}
button.danger:hover {
  box-shadow: 0 6px 16px rgba(239, 68, 68, 0.35);
}

button.tiny {
  padding: 0.35rem 0.65rem;
  font-size: 0.78rem;
  border-radius: 6px;
}

.actions {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}
.actions form {
  margin: 0;
  display: inline-block;
}

/* Accordion (details/summary) */
details.add-box {
  margin-bottom: 1.5rem;
  background: var(--surface-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  transition: var(--transition-smooth);
}

details.add-box summary {
  padding: 1rem 1.25rem;
  cursor: pointer;
  font-weight: 600;
  color: var(--text);
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
  background: rgba(255, 255, 255, 0.01);
}

details.add-box summary::after {
  content: '';
  display: inline-block;
  width: 8px;
  height: 8px;
  border-right: 2px solid var(--muted);
  border-bottom: 2px solid var(--muted);
  transform: rotate(45deg);
  transition: var(--transition-smooth);
  margin-right: 0.25rem;
}

details[open].add-box summary::after {
  transform: rotate(-135deg);
}

details.add-box[open] {
  border-color: rgba(255, 255, 255, 0.1);
}

details.add-box > form,
details.add-box > div {
  padding: 1.25rem;
  border-top: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.1);
}

/* Textarea resizing */
textarea {
  min-height: 120px;
  resize: vertical;
}

/* Login Page Box */
.login-box {
  max-width: 400px;
  margin: 6rem auto;
  background: rgba(18, 24, 36, 0.55);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2.25rem;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.3), 0 10px 10px -5px rgba(0, 0, 0, 0.2);
}

.login-box h1 {
  text-align: center;
  margin-bottom: 0.5rem;
}

.login-box p {
  text-align: center;
  margin-bottom: 2rem;
}

/* Charts Card Container */
.chart-box {
  background: var(--surface-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem;
  margin: 1.5rem 0 2rem;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

/* Inline note form (devices page) */
.inline-note {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  margin: 0;
  width: 100%;
}

.inline-note input {
  min-width: 120px;
  padding: 0.4rem 0.6rem;
  font-size: 0.85rem;
  border-radius: 6px;
}

/* Toast/Flash Alerts */
.flashes {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  animation: slideInDown 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.flash {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.85rem 1.1rem;
  border-radius: 10px;
  font-weight: 500;
  font-size: 0.9rem;
  border: 1px solid transparent;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.flash-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.flash-ok {
  background: var(--ok-bg);
  color: #a7f3d0;
  border-color: var(--ok-border);
}
.flash-ok .flash-icon {
  color: var(--ok);
}

.flash-error {
  background: var(--bad-bg);
  color: #fecaca;
  border-color: var(--bad-border);
}
.flash-error .flash-icon {
  color: var(--bad);
}

/* Animations */
@keyframes slideInDown {
  from {
    transform: translateY(-1rem);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

/* Responsiveness overrides */
@media (max-width: 900px) {
  .topbar-inner {
    flex-direction: column;
    padding: 1rem;
    gap: 1rem;
  }
  .topbar nav {
    flex-wrap: wrap;
    justify-content: center;
    width: 100%;
  }
  .topbar nav a {
    padding: 0.45rem 0.65rem;
    font-size: 0.82rem;
  }
}

@media (max-width: 700px) {
  table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }
  .row-between {
    flex-direction: column;
    align-items: stretch;
  }
  .row-between button, .row-between form {
    width: 100%;
  }
}