:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --success: #10b981;
  --warning: #f59e0b;
  --surface: #ffffff;
  --surface-card: #fefefe;
  --bg-main: #f8fafc;
  --bg-secondary: #f1f5f9;
  --text-bold: #0f172a;
  --text-main: #334155;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  --border: #e2e8f0;
  --border-focus: #c7d2fe;
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --glass: rgba(255, 255, 255, 0.85);
  --glass-hover: rgba(255, 255, 255, 0.95);
}

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

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: linear-gradient(135deg, var(--bg-main) 0%, #e2e8f0 100%);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
}

.nav-tabs {
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--glass);
  padding: 16px 24px;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--primary);
  font-weight: 800;
  font-size: 1.1rem;
  padding: 8px 16px;
  border-radius: var(--radius-md);
  background: rgba(99, 102, 241, 0.1);
  transition: all 0.2s;
}

.nav-logo svg {
  width: 24px;
  height: 24px;
}

.nav-logo:hover {
  background: rgba(99, 102, 241, 0.2);
  transform: scale(1.05);
}

.logo-text {
  font-size: 1rem;
  letter-spacing: -0.025em;
}

.nav-tabs-container {
  display: flex;
  flex: 1;
  gap: 4px;
  justify-content: center;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.nav-tabs-container::-webkit-scrollbar {
  display: none;
}

.tab-btn {
  padding: 12px 20px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  white-space: nowrap;
  flex-shrink: 0;
}

.tab-btn::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: all 0.25s ease;
  transform: translateX(-50%);
}

.tab-btn:hover {
  background: var(--glass-hover);
  color: var(--text-bold);
  transform: translateY(-1px);
}

.tab-btn:hover::before {
  width: 100%;
}

.tab-btn.active {
  background: var(--primary);
  color: white;
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.tab-btn.active::before {
  width: 100%;
  background: rgba(255,255,255,0.3);
}

.tab-content {
  display: none;
  padding: 48px 32px;
  max-width: 1200px;
  margin: 0 auto;
  animation: slideUp 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.tab-content.active {
  display: block;
}

@keyframes slideUp {
  from { 
    opacity: 0; 
    transform: translateY(24px); 
  }
  to { 
    opacity: 1; 
    transform: translateY(0); 
  }
}

h2 {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--text-bold);
  margin-bottom: 12px;
}

.subtitle {
  color: var(--text-muted);
  font-size: 1.1rem;
  margin-bottom: 32px;
  font-weight: 400;
}

.card {
  background: var(--surface);
  padding: 40px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(10px);
}

.form-row {
  margin-bottom: 24px;
}

label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-bold);
  letter-spacing: 0.025em;
}

input, select {
  width: 100%;
  padding: 14px 18px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  font-size: 1rem;
  background: var(--surface-card);
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  font-family: inherit;
}

input:focus, select:focus {
  background: #fff;
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.15);
  outline: none;
  transform: translateY(-1px);
}

button[type="submit"] {
  width: 100%;
  padding: 16px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: var(--shadow-md);
  letter-spacing: 0.025em;
  text-transform: uppercase;
  position: relative;
  overflow: hidden;
}

button[type="submit"]:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

button[type="submit"]:active {
  transform: translateY(0);
}

table {
  width: 100%;
  border-spacing: 0;
  border-collapse: separate;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
}

th {
  background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
  padding: 18px 16px;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  border-bottom: 2px solid var(--border);
  font-weight: 700;
}

td {
  padding: 20px 16px;
  background: var(--surface-card);
  border-bottom: 1px solid var(--border);
  transition: background 0.2s;
}

tr:hover td {
  background: #f8fafc;
}

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

.supplier-group {
  display: grid;
  gap: 24px;
}

.supplier-card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: transform 0.3s, box-shadow 0.3s;
}

.supplier-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 10px 10px -5px rgb(0 0 0 / 0.04);
}

.supplier-header {
  padding: 28px;
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  color: white;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.supplier-info h4 {
  font-size: 1.4rem;
  font-weight: 800;
  margin: 0 0 4px 0;
  letter-spacing: -0.025em;
}

.supplier-city {
  font-size: 0.95rem;
  opacity: 0.95;
  font-weight: 500;
}

.supplier-total {
  font-family: 'SF Mono', 'Monaco', monospace;
  font-size: 1.3rem;
  font-weight: 700;
  background: rgba(255,255,255,0.15);
  padding: 8px 16px;
  border-radius: var(--radius-md);
  backdrop-filter: blur(10px);
}

.supplier-items {
  padding: 24px;
}

.item-row {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1.2fr;
  gap: 12px;
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
  align-items: center;
  font-size: 0.95rem;
}

.item-row:last-child {
  border-bottom: none;
}

.item-name {
  font-weight: 600;
  color: var(--text-bold);
}

.item-category {
  color: var(--text-muted);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.item-qty, .item-price {
  text-align: right;
  font-weight: 500;
  color: var(--text-main);
}

.item-value {
  color: var(--success);
  font-weight: 700;
  text-align: right;
  font-size: 1.05rem;
}

.no-results {
  text-align: center;
  padding: 60px 40px;
  color: var(--text-muted);
  background: var(--surface-card);
  border-radius: var(--radius-lg);
  border: 2px dashed var(--border);
  margin-top: 20px;
}

@media (max-width: 1200px) {
  .tab-content {
    padding: 40px 24px;
    max-width: 1000px;
  }
}

@media (max-width: 1024px) {
  .nav-tabs {
    padding: 14px 20px;
    gap: 12px;
  }
  
  .nav-logo {
    font-size: 1rem;
  }
  
  .nav-logo svg {
    width: 20px;
    height: 20px;
  }
  
  .tab-btn {
    padding: 10px 16px;
    font-size: 14px;
  }
  
  .tab-content {
    padding: 36px 20px;
  }
  
  h2 {
    font-size: 1.75rem;
  }
}

@media (max-width: 768px) {
  .nav-tabs {
    padding: 12px 16px;
    gap: 8px;
    flex-wrap: wrap;
  }
  
  .nav-logo {
    font-size: 0.95rem;
    padding: 6px 12px;
  }
  
  .nav-logo svg {
    width: 18px;
    height: 18px;
  }
  
  .nav-tabs-container {
    gap: 2px;
  }
  
  .tab-btn {
    padding: 8px 12px;
    font-size: 13px;
    flex: 1;
    min-width: 70px;
  }
  
  .tab-content {
    padding: 32px 16px;
  }
  
  .card {
    padding: 28px;
  }
  
  h2 {
    font-size: 1.5rem;
  }
  
  .subtitle {
    font-size: 1rem;
  }
  
  .item-row {
    grid-template-columns: 1.8fr 1fr 0.8fr 0.8fr 1fr;
    gap: 8px;
    font-size: 0.9rem;
    padding: 16px 0;
  }
  
  .supplier-header {
    padding: 20px;
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
  
  .supplier-info h4 {
    font-size: 1.25rem;
  }
  
  .supplier-total {
    font-size: 1.15rem;
    padding: 6px 12px;
  }
}

@media (max-width: 480px) {
  .nav-tabs {
    padding: 10px 12px;
    flex-direction: column;
    gap: 8px;
  }
  
  .nav-logo {
    justify-content: center;
    width: 100%;
    padding: 8px;
  }
  
  .nav-tabs-container {
    width: 100%;
    justify-content: space-around;
  }
  
  .tab-btn {
    padding: 10px 8px;
    font-size: 12px;
    min-width: 60px;
  }
  
  .tab-content {
    padding: 24px 12px;
  }
  
  .card {
    padding: 20px;
  }
  
  h2 {
    font-size: 1.25rem;
    margin-bottom: 8px;
  }
  
  .form-row {
    margin-bottom: 20px;
  }
  
  input, select {
    padding: 12px 14px;
  }
  
  button[type="submit"] {
    padding: 14px;
    font-size: 1rem;
  }
  
  table th, table td {
    padding: 12px 8px;
  }
  
  th {
    font-size: 0.7rem;
  }
  
  .item-row {
    grid-template-columns: 2fr 0.8fr 0.7fr 0.7fr 1fr;
    gap: 6px;
    font-size: 0.85rem;
    padding: 12px 0;
  }
  
  .supplier-items {
    padding: 16px;
  }
  
  .no-results {
    padding: 40px 24px;
  }
}