:root {
  --bg-primary: #0f172a;
  --bg-card: #1e293b;
  --bg-card-hover: #334155;
  --border-color: #334155;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --accent-green: #10b981;
  --accent-blue: #3b82f6;
  --accent-amber: #f59e0b;
  --accent-red: #ef4444;
  --accent-purple: #8b5cf6;
  --radius: 12px;
  --shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.5);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header Navbar */
.navbar {
  background: rgba(30, 41, 59, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 100;
}

.navbar .brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--accent-green);
}

.navbar .brand svg {
  width: 28px;
  height: 28px;
  fill: currentColor;
}

.user-controls {
  display: flex;
  align-items: center;
  gap: 16px;
}

.btn {
  background-color: var(--accent-blue);
  color: white;
  border: none;
  padding: 0.6rem 1.2rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: var(--bg-card-hover);
  color: var(--text-main);
}

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

.btn-green {
  background-color: var(--accent-green);
}

/* Main Layout */
.container {
  max-width: 1300px;
  margin: 2rem auto;
  padding: 0 1.5rem;
  width: 100%;
}

/* Grid Cards */
.grid-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.stat-info h3 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

.stat-info .value {
  font-size: 1.8rem;
  font-weight: 800;
}

.stat-icon {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
}

.stat-icon.pending { background: rgba(245, 158, 11, 0.15); color: var(--accent-amber); }
.stat-icon.sent { background: rgba(16, 185, 129, 0.15); color: var(--accent-green); }
.stat-icon.failed { background: rgba(239, 68, 68, 0.15); color: var(--accent-red); }
.stat-icon.total { background: rgba(59, 130, 246, 0.15); color: var(--accent-blue); }

/* QR Code & Status Section */
.status-panel {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
}

.connection-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0.4rem 1rem;
  border-radius: 20px;
  font-weight: 600;
  font-size: 0.9rem;
}

.badge-connected { background: rgba(16, 185, 129, 0.2); color: var(--accent-green); border: 1px solid var(--accent-green); }
.badge-scan { background: rgba(245, 158, 11, 0.2); color: var(--accent-amber); border: 1px solid var(--accent-amber); }
.badge-disconnected { background: rgba(239, 68, 68, 0.2); color: var(--accent-red); border: 1px solid var(--accent-red); }

.qr-box {
  background: white;
  padding: 12px;
  border-radius: 12px;
  display: inline-block;
  box-shadow: 0 4px 15px rgba(0,0,0,0.3);
}

.qr-box img {
  display: block;
  width: 180px;
  height: 180px;
}

/* Tabs & Tables */
.section-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  margin-bottom: 2rem;
}

.table-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.table-wrapper {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

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

th {
  background-color: rgba(15, 23, 42, 0.5);
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.05em;
}

tr:hover {
  background-color: var(--bg-card-hover);
}

/* Badges for Status */
.status-pill {
  padding: 0.25rem 0.65rem;
  border-radius: 12px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
}

.status-pending { background: rgba(245, 158, 11, 0.2); color: var(--accent-amber); }
.status-processing { background: rgba(139, 92, 246, 0.2); color: var(--accent-purple); }
.status-sent { background: rgba(16, 185, 129, 0.2); color: var(--accent-green); }
.status-failed { background: rgba(239, 68, 68, 0.2); color: var(--accent-red); }
.status-cancelled { background: rgba(148, 163, 184, 0.2); color: var(--text-muted); }

/* Forms & Inputs */
input, textarea, select {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.7rem 1rem;
  border-radius: var(--radius);
  font-size: 0.95rem;
  width: 100%;
}

input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--accent-blue);
}

/* Login Page Styling */
.login-body {
  justify-content: center;
  align-items: center;
}

.login-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 2.5rem;
  width: 100%;
  max-width: 420px;
  box-shadow: var(--shadow);
}

.login-card h2 {
  margin-bottom: 1.5rem;
  text-align: center;
  font-size: 1.6rem;
  color: var(--accent-green);
}

.form-group {
  margin-bottom: 1.2rem;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

/* Modal */
.modal {
  display: none;
  position: fixed;
  top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(4px);
  z-index: 1000;
  justify-content: center;
  align-items: center;
}

.modal-content {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 2rem;
  width: 90%;
  max-width: 500px;
  box-shadow: var(--shadow);
}