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

:root {
  --primary: #075e54;
  --primary-dark: #054c44;
  --primary-light: #128c7e;
  --accent: #25d366;
  --bg: #f0f2f5;
  --card-bg: #ffffff;
  --text: #1a1a2e;
  --text-secondary: #667781;
  --border: #e9edef;
  --danger: #ea4335;
  --warning: #fbbc04;
  --success: #25d366;
  --info: #34b7f1;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

/* LOGIN */
.login-container {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
}

.login-box {
  background: var(--card-bg);
  padding: 40px;
  border-radius: 12px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
  width: 100%;
  max-width: 400px;
}

.login-box h1 {
  color: var(--primary);
  margin-bottom: 8px;
  font-size: 24px;
}

.login-box p {
  color: var(--text-secondary);
  margin-bottom: 24px;
  font-size: 14px;
}

.form-group {
  margin-bottom: 16px;
}

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

.form-group input {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  transition: border-color 0.2s;
}

.form-group input:focus {
  outline: none;
  border-color: var(--primary);
}

.btn {
  display: inline-block;
  padding: 10px 20px;
  border: none;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-primary {
  background: var(--primary);
  color: white;
  width: 100%;
  padding: 12px;
}

.btn-primary:hover {
  background: var(--primary-dark);
}

.btn-success { background: var(--success); color: white; }
.btn-danger { background: var(--danger); color: white; }
.btn-info { background: var(--info); color: white; }
.btn-sm { padding: 6px 12px; font-size: 12px; }

.error-msg {
  color: var(--danger);
  font-size: 13px;
  margin-top: 8px;
  display: none;
}

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

.sidebar {
  width: 260px;
  background: var(--primary-dark);
  color: white;
  padding: 20px 0;
  flex-shrink: 0;
}

.sidebar-header {
  padding: 0 20px 20px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
  margin-bottom: 10px;
}

.sidebar-header h2 {
  font-size: 18px;
  font-weight: 700;
}

.sidebar-header small {
  opacity: 0.7;
  font-size: 12px;
}

.nav-item {
  display: flex;
  align-items: center;
  padding: 12px 20px;
  color: rgba(255,255,255,0.8);
  text-decoration: none;
  cursor: pointer;
  transition: all 0.2s;
  font-size: 14px;
}

.nav-item:hover, .nav-item.active {
  background: rgba(255,255,255,0.1);
  color: white;
}

.nav-item .icon {
  width: 20px;
  margin-right: 12px;
  text-align: center;
}

.main {
  flex: 1;
  padding: 24px;
  overflow-y: auto;
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}

.header h1 {
  font-size: 24px;
  font-weight: 700;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.user-info span {
  font-size: 14px;
  color: var(--text-secondary);
}

/* CARDS */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.stat-card {
  background: var(--card-bg);
  padding: 20px;
  border-radius: 12px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

.stat-card .label {
  font-size: 12px;
  color: var(--text-secondary);
  text-transform: uppercase;
  font-weight: 600;
  letter-spacing: 0.5px;
}

.stat-card .value {
  font-size: 28px;
  font-weight: 700;
  margin-top: 4px;
}

.stat-card .value.success { color: var(--success); }
.stat-card .value.danger { color: var(--danger); }
.stat-card .value.info { color: var(--info); }
.stat-card .value.warning { color: var(--warning); }

.card {
  background: var(--card-bg);
  border-radius: 12px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
  margin-bottom: 24px;
}

.card-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.card-header h3 {
  font-size: 16px;
  font-weight: 600;
}

.card-body {
  padding: 20px;
}

/* QR CODE */
.qr-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 20px;
}

.qr-container img,
.qr-container canvas {
  max-width: 280px;
  border-radius: 8px;
}

.qr-placeholder {
  width: 280px;
  height: 280px;
  background: var(--bg);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  font-size: 14px;
}

/* STATUS BADGE */
.badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
}

.badge-success { background: #e6f9ef; color: #0d7a3e; }
.badge-danger { background: #fde8e8; color: #c53030; }
.badge-warning { background: #fef3cd; color: #856404; }
.badge-info { background: #e1f5fe; color: #0277bd; }

/* TABLE */
table {
  width: 100%;
  border-collapse: collapse;
}

th, td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  font-size: 13px;
}

th {
  font-weight: 600;
  color: var(--text-secondary);
  font-size: 12px;
  text-transform: uppercase;
}

tr:hover {
  background: rgba(0,0,0,0.02);
}

/* SECTIONS */
.section {
  display: none;
}

.section.active {
  display: block;
}

/* RESPONSIVE */
@media (max-width: 768px) {
  .sidebar {
    width: 60px;
  }
  .sidebar-header h2, .sidebar-header small, .nav-item span {
    display: none;
  }
  .nav-item {
    justify-content: center;
    padding: 14px;
  }
  .nav-item .icon {
    margin-right: 0;
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}