:root {
  --primary-gradient: linear-gradient(135deg, #6366f1 0%, #a855f7 100%);
  --accent-gradient: linear-gradient(135deg, #3b82f6 0%, #2dd4bf 100%);
  --surface: #ffffff;
  --background: #f8fafc;
  --border: #e2e8f0;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --shadow-subtle: 0 4px 6px -1px rgb(0 0 0 / 0.05), 0 2px 4px -2px rgb(0 0 0 / 0.05);
  --shadow-md: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
}

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background-color: var(--background);
  color: var(--text-main);
  line-height: 1.6;
  background-image: 
    radial-gradient(at 0% 0%, hsla(253,16%,7%,1) 0, transparent 50%), 
    radial-gradient(at 50% 0%, hsla(225,39%,30%,1) 0, transparent 50%), 
    radial-gradient(at 100% 0%, hsla(339,49%,30%,1) 0, transparent 50%);
  background-attachment: fixed;
  background-size: cover;
  min-height: 100vh;
}

/* Glassmorphism background */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(248, 250, 252, 0.85);
  backdrop-filter: blur(100px);
  z-index: -1;
}

.navbar {
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.3);
  padding: 1.25rem 0;
  position: sticky;
  top: 0;
  z-index: 1000;
}

.navbar-brand {
  font-weight: 800;
  font-size: 1.5rem;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.card {
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.4);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-subtle);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn {
  font-weight: 600;
  border-radius: var(--radius-md);
  padding: 0.75rem 1.5rem;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.625rem;
  border: none;
}

.btn-primary {
  background: var(--primary-gradient);
  color: white;
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
  transform: scale(1.02);
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
  background: var(--primary-gradient);
  filter: brightness(1.1);
}

.btn-light {
  background: rgba(241, 245, 249, 0.8);
  color: var(--text-main);
}

.form-control, .form-select {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  background: rgba(255, 255, 255, 0.8);
  transition: all 0.2s ease;
}

.form-control:focus {
  background: #fff;
  border-color: #6366f1;
  box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

.dropzone {
  border: 2px dashed #cbd5e1;
  border-radius: var(--radius-md);
  padding: 3.5rem 2rem;
  background: rgba(248, 250, 252, 0.5);
  cursor: pointer;
  transition: all 0.3s ease;
}

.dropzone:hover {
  border-color: #6366f1;
  background: rgba(99, 102, 241, 0.05);
  transform: translateY(-2px);
}

.dropzone i {
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-size: 3rem;
  margin-bottom: 1.5rem;
}

.stats-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.stat-item {
  background: white;
  padding: 1.25rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

.stat-item::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--primary-gradient);
}

.stat-label {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
}

.stat-value {
  font-size: 1.875rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1;
}

.batch-card {
  border: none;
  background: white;
  margin-bottom: 1.25rem;
  position: relative;
  overflow: hidden;
}

.batch-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 6px;
  height: 100%;
  background: var(--accent-gradient);
}

.badge-count {
  background: rgba(59, 130, 246, 0.1);
  color: #2563eb;
  font-weight: 700;
  padding: 0.35rem 0.75rem;
  border-radius: 9999px;
}

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

.batch-title {
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.dynamic-batch-input {
  animation: fadeIn 0.3s ease-out;
}

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

.sticky-panel {
  position: sticky;
  top: 6rem;
}

footer {
  background: transparent;
  margin-top: 4rem;
}

.hero-section {
  text-align: center;
  padding: 4rem 0 2rem;
}

.hero-section h1 {
  font-weight: 900;
  font-size: 3rem;
  letter-spacing: -0.05em;
  margin-bottom: 1rem;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-section p {
  color: var(--text-muted);
  font-size: 1.25rem;
  max-width: 600px;
  margin: 0 auto;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 10px;
}
::-webkit-scrollbar-track {
  background: #f1f5f9;
}
::-webkit-scrollbar-thumb {
  background: #cbd5e1;
  border-radius: 5px;
}
::-webkit-scrollbar-thumb:hover {
  background: #94a3b8;
}

/* Glass Detail Summary */
details summary {
  padding: 0.5rem 0;
  color: var(--accent);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}
details summary:hover {
  filter: brightness(0.8);
}