:root {
    --primary-gradient: linear-gradient(135deg, #6366f1 0%, #a855f7 100%);
    --bg-color: #f8fafc;
    --card-bg: rgba(255, 255, 255, 0.8);
    --text-main: #1e293b;
    --text-muted: #64748b;
    --border-color: rgba(226, 232, 240, 0.8);
}

body {
    background-color: var(--bg-color);
    background-image: 
        radial-gradient(at 0% 0%, rgba(99, 102, 241, 0.05) 0px, transparent 50%),
        radial-gradient(at 100% 0%, rgba(168, 85, 247, 0.05) 0px, transparent 50%);
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    color: var(--text-main);
    min-height: 100vh;
    letter-spacing: -0.01em;
}

.navbar {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 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: 0.5rem;
}

.hero-section {
    padding: 4rem 0 3rem;
    text-align: center;
}

.hero-section h1 {
    font-weight: 900;
    font-size: clamp(2.5rem, 5vw, 4rem);
    margin-bottom: 1rem;
    letter-spacing: -0.04em;
    background: linear-gradient(to bottom, #1e293b, #475569);
    -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;
}

.card {
    background: var(--card-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.dropzone {
    border: 2px dashed #cbd5e1;
    border-radius: 20px;
    padding: 3rem 2rem;
    text-align: center;
    transition: all 0.2s ease;
    cursor: pointer;
    background: rgba(248, 250, 252, 0.5);
}

.dropzone:hover, .dropzone.drag-active {
    border-color: #6366f1;
    background: rgba(99, 102, 241, 0.05);
    transform: scale(1.01);
}

.dropzone.drag-active {
    border-style: solid;
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

.dropzone i {
    width: 48px;
    height: 48px;
    color: #6366f1;
    margin-bottom: 1rem;
}

.form-control, .form-select {
    border-radius: 12px;
    padding: 0.75rem 1rem;
    border: 2px solid #f1f5f9;
    font-weight: 500;
}

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

.stats-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.stat-item {
    background: white;
    padding: 1.25rem;
    border-radius: 16px;
    border: 1px solid #f1f5f9;
}

.stat-label {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
}

.stat-value {
    font-size: 1.75rem;
    font-weight: 800;
}

.btn-primary {
    background: var(--primary-gradient);
    border: none;
    border-radius: 14px;
    font-weight: 700;
    padding: 0.8rem 1.5rem;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
    transition: all 0.2s ease;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
}

.batch-card {
    margin-bottom: 1.5rem;
    border-left: 6px solid #6366f1;
}

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

.batch-title {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.badge-count {
    background: #f1f5f9;
    color: #475569;
    padding: 0.25rem 0.75rem;
    border-radius: 99px;
    font-size: 0.85rem;
    font-weight: 600;
}

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

.dynamic-batch-input .input-group-text {
    min-width: 100px;
    font-size: 0.8rem;
    font-weight: 600;
}

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

.animate-fadeIn {
    animation: fadeIn 0.4s ease forwards;
}

/* Custom scrollbar */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: #f1f5f9;
}
::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 10px;
}
::-webkit-scrollbar-thumb:hover {
    background: #94a3b8;
}