:root {
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --bg-color: #f8fafc;
  --card-bg: #ffffff;
  --text-main: #1e293b;
  --text-muted: #64748b;
  --error: #ef4444;
  --success: #22c55e;
  --nav-bg: #ffffff;
  --border-color: #e2e8f0;
  --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --glass-bg: rgba(255, 255, 255, 0.7);
}

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

body {
  font-family: 'Inter', sans-serif;
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

/* Navbar */
nav {
  background-color: var(--nav-bg);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 2px 0 rgb(0 0 0 / 0.05);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-brand {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--primary);
  letter-spacing: -0.025em;
}

.nav-links {
  display: flex;
  gap: 1rem;
}

.nav-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  font-weight: 500;
  cursor: pointer;
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
  transition: all 0.2s;
}

.nav-btn:hover {
  background-color: var(--bg-color);
  color: var(--primary);
}

.nav-user-info {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.875rem;
}

.logout-btn {
  background-color: #fee2e2;
  color: #b91c1c;
  border: none;
  padding: 0.4rem 0.8rem;
  border-radius: 0.4rem;
  cursor: pointer;
  font-weight: 600;
}

/* Views */
.view {
  animation: fadeIn 0.4s ease-out;
}

.hidden {
  display: none !important;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Login Card */
.login-card {
  max-width: 400px;
  margin: 100px auto;
  background: var(--card-bg);
  padding: 2.5rem;
  border-radius: 1rem;
  box-shadow: var(--shadow);
  border: 1px solid var(--border-color);
}

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

.login-header h1 {
  font-size: 1.875rem;
  font-weight: 700;
  color: var(--text-main);
}

.login-header p {
  color: var(--text-muted);
}

/* Forms */
.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
  color: var(--text-main);
}

input {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  font-family: inherit;
  font-size: 1rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.primary-btn {
  width: 100%;
  background-color: var(--primary);
  color: white;
  border: none;
  padding: 0.75rem;
  border-radius: 0.5rem;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s;
}

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

.secondary-btn {
  background-color: white;
  color: var(--text-main);
  border: 1px solid var(--border-color);
  padding: 0.75rem 1.5rem;
  border-radius: 0.5rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

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

.error-msg {
  color: var(--error);
  font-size: 0.875rem;
  margin-top: 1rem;
  text-align: center;
}

/* Sections */
.section-header {
  margin-bottom: 2.5rem;
  border-left: 4px solid var(--primary);
  padding-left: 1.5rem;
}

.section-header h2 {
  font-size: 1.5rem;
  font-weight: 700;
}

.section-header p {
  color: var(--text-muted);
}

/* Product Grid */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

.product-card {
  background: var(--card-bg);
  padding: 1.5rem;
  border-radius: 0.75rem;
  border: 1px solid var(--border-color);
  display: flex;
  gap: 1.25rem;
  align-items: center;
  transition: transform 0.2s, box-shadow 0.2s;
}

.product-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.product-icon {
  font-size: 2rem;
  background: var(--bg-color);
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 0.75rem;
}

.product-info {
  display: flex;
  flex-direction: column;
}

.product-name {
  font-weight: 600;
  font-size: 1.1rem;
}

.product-price {
  color: var(--primary);
  font-weight: 700;
  font-size: 1.25rem;
}

.product-stock {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: 0.25rem;
}

/* Admin Grid */
.admin-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.card-glass {
  background: var(--glass-bg);
  backdrop-filter: blur(8px);
  padding: 2rem;
  border-radius: 1rem;
  border: 1px solid rgba(255, 255, 255, 0.4);
  box-shadow: var(--shadow);
}

.card-glass h3 {
  margin-bottom: 1.5rem;
  font-size: 1.25rem;
}

.stat-card {
  background: linear-gradient(135deg, var(--primary), var(--primary-hover));
  color: white;
  padding: 1.5rem;
  border-radius: 1rem;
  display: inline-flex;
  flex-direction: column;
  min-width: 200px;
  margin-bottom: 2rem;
}

.stat-value {
  font-size: 2.5rem;
  font-weight: 800;
}

.stat-label {
  font-size: 0.875rem;
  opacity: 0.9;
}

.report-viewer {
  margin-top: 1.5rem;
  background: #1e293b;
  color: #e2e8f0;
  padding: 1rem;
  border-radius: 0.5rem;
  max-height: 300px;
  overflow-y: auto;
}

.code-block {
  font-family: 'Monaco', 'Consolas', monospace;
  font-size: 0.875rem;
}

@media (max-width: 768px) {
    .admin-grid {
        grid-template-columns: 1fr;
    }
}