@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
  --bg-color: #0b0f19;
  --card-bg: rgba(23, 32, 51, 0.6);
  --card-border: rgba(255, 255, 255, 0.08);
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --accent-gradient: linear-gradient(135deg, #3b82f6, #10b981);
  --accent-color: #3b82f6;
  --success-color: #10b981;
  --danger-color: #ef4444;
  --input-bg: rgba(15, 23, 42, 0.8);
  --input-border: rgba(255, 255, 255, 0.1);
  --input-focus: rgba(59, 130, 246, 0.5);
  --font-family: 'Inter', sans-serif;
  --border-radius: 16px;
  --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.3);
}

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-color);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-image: radial-gradient(circle at top right, rgba(59, 130, 246, 0.15), transparent 40%),
                    radial-gradient(circle at bottom left, rgba(16, 185, 129, 0.1), transparent 40%);
  background-attachment: fixed;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
  width: 100%;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 3rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--card-border);
}

h1 {
  font-size: 2.5rem;
  font-weight: 700;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -1px;
}

.subtitle {
  color: var(--text-secondary);
  font-size: 1rem;
  margin-top: 0.5rem;
}

/* Glassmorphism Cards */
.card {
  background: var(--card-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--card-border);
  border-radius: var(--border-radius);
  padding: 2rem;
  box-shadow: var(--shadow-lg);
  margin-bottom: 2rem;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 15px 35px -5px rgba(0, 0, 0, 0.6);
}

.card h2 {
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* Forms & Inputs */
.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
}

.input-group {
  display: flex;
  flex-direction: column;
}

.input-group label {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
  font-weight: 500;
}

input, select {
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  color: var(--text-primary);
  padding: 0.75rem 1rem;
  border-radius: 8px;
  font-family: var(--font-family);
  font-size: 1rem;
  outline: none;
  transition: all 0.2s ease;
}

input:focus, select:focus {
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px var(--input-focus);
}

input[type="number"]::-webkit-inner-spin-button, 
input[type="number"]::-webkit-outer-spin-button { 
  -webkit-appearance: none; 
  margin: 0; 
}

/* Buttons */
.btn {
  background: var(--accent-gradient);
  color: white;
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: opacity 0.2s, transform 0.1s;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.btn:hover {
  opacity: 0.9;
}

.btn:active {
  transform: scale(0.98);
}

.btn-secondary {
  background: transparent;
  border: 1px solid var(--text-secondary);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background: rgba(255,255,255,0.05);
}

/* Action Area */
.form-actions {
  margin-top: 2rem;
  display: flex;
  justify-content: flex-end;
  gap: 1rem;
}

/* Table */
.table-container {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

th, td {
  padding: 1rem;
  border-bottom: 1px solid var(--card-border);
}

th {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.875rem;
  white-space: nowrap;
}

td {
  font-size: 0.95rem;
}

tr:hover td {
  background: rgba(255, 255, 255, 0.02);
}

.currency {
  font-variant-numeric: tabular-nums;
  font-weight: 500;
}

.text-success { color: var(--success-color); }
.text-danger { color: var(--danger-color); }

/* Results Totals */
.totals-section {
  display: flex;
  justify-content: flex-end;
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--card-border);
}

.totals-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.5rem 2rem;
  text-align: right;
}

.totals-label {
  color: var(--text-secondary);
  font-weight: 500;
}

.totals-value {
  font-weight: 600;
  font-size: 1.1rem;
}

.totals-value.grand-total {
  font-size: 1.5rem;
  color: var(--success-color);
}

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

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

/* Print Styles */
@media print {
  @page {
    size: letter portrait;
    margin: 1.5cm;
  }
  body {
    background: white;
    color: black;
  }
  .card {
    box-shadow: none;
    border: none;
    background: transparent;
    padding: 0;
  }
  .btn, .form-section, #preview-section {
    display: none !important;
  }
  * {
    color: black;
  }
  h1, h2, th {
    color: #0056b3 !important;
    -webkit-text-fill-color: #0056b3 !important;
  }
  th {
    border-bottom: 2px solid #0056b3;
  }
  .totals-label {
    color: #0056b3 !important;
  }
  .totals-value.grand-total {
    color: #0056b3 !important;
  }
}