:root {
  --primary: #4F46E5;
  --primary-hover: #4338ca;
  --secondary: #64748b;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --background: #f8fafc;
  --surface: #ffffff;
  --border: #e2e8f0;
  --text-main: #1e293b;
  --text-muted: #64748b;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow: 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);
  --radius: 0.5rem;
  --radius-lg: 0.75rem;
}

* {
  box-sizing: border-box;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: var(--background);
  color: var(--text-main);
  line-height: 1.5;
  margin: 0;
  padding: 2rem;
}

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

/* Header */
.page-header {
  margin-bottom: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.page-title {
  font-size: 1.875rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 0;
}
.page-subtitle {
  color: var(--text-muted);
  margin-top: 0.25rem;
}

/* Cards */
.card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: 1.5rem;
  margin-bottom: 2rem;
  border: 1px solid var(--border);
}
.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}
.card-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 0;
  color: var(--text-main);
}

/* Forms */
.form-grid {
  display: grid;
  grid-template-columns: repeat(1, 1fr);
  gap: 1.5rem;
}
@media (min-width: 640px) {
  .form-grid-2 { grid-template-columns: repeat(2, 1fr); }
  .form-grid-3 { grid-template-columns: repeat(3, 1fr); }
  .form-grid-4 { grid-template-columns: repeat(4, 1fr); }
}

.form-group {
  margin-bottom: 0;
}
.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-main);
  margin-bottom: 0.5rem;
}
.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 0.625rem 0.875rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.95rem;
  background-color: #fff;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.form-input:focus, .form-select:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}
.form-textarea {
  min-height: 100px;
  resize: vertical;
}

/* Checkboxes */
.checkbox-group {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.checkbox-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}
.checkbox-item input[type="checkbox"],
.checkbox-item input[type="radio"] {
  margin-top: 0.25rem;
  width: 1rem;
  height: 1rem;
  border-radius: 4px;
  cursor: pointer;
}
.checkbox-label {
  font-size: 0.95rem;
  color: var(--text-main);
  cursor: pointer;
}

/* Tables */
.table-container {
  overflow-x: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}
.table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}
.table th, .table td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}
.table th {
  background-color: #f1f5f9;
  font-weight: 600;
  color: var(--text-main);
}
.table tr:last-child td {
  border-bottom: none;
}
.table-input {
  width: 100%;
  padding: 0.375rem;
  border: 1px solid var(--border);
  border-radius: 4px;
}

/* Approval Workflow */
.workflow-container {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}
.workflow-step {
  display: flex;
  gap: 1.5rem;
  position: relative;
}
.workflow-step:not(:last-child)::after {
  content: '';
  position: absolute;
  left: 24px; /* Center of icon (48px / 2) */
  top: 48px;
  bottom: -32px;
  width: 2px;
  background-color: var(--border);
  z-index: 0;
}
.workflow-icon {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background-color: var(--background);
  border: 2px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  z-index: 1;
  font-weight: 600;
  color: var(--text-muted);
}
.workflow-step.active .workflow-icon {
  border-color: var(--primary);
  color: var(--primary);
  background-color: #eff6ff;
}
.workflow-step.completed .workflow-icon {
  border-color: var(--success);
  color: #fff;
  background-color: var(--success);
}
.workflow-content {
  flex: 1;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  position: relative;
}
.workflow-content::before {
  content: '';
  position: absolute;
  left: -6px;
  top: 20px;
  width: 10px;
  height: 10px;
  background: #fff;
  border-left: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  transform: rotate(45deg);
}
.workflow-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 1rem;
}
.role-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.75rem;
  background-color: #f1f5f9;
  color: var(--text-main);
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.status-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.75rem;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
}
.status-pending { background-color: #fef3c7; color: #b45309; }
.status-approved { background-color: #d1fae5; color: #047857; }
.status-rejected { background-color: #fee2e2; color: #b91c1c; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.625rem 1.25rem;
  font-weight: 500;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.2s;
  border: none;
  font-size: 0.95rem;
}
.btn-primary {
  background: linear-gradient(135deg, #6366F1 0%, #8B5CF6 100%);
  color: white;
  box-shadow: 0 4px 14px rgba(99, 102, 241, 0.4);
}
.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.6);
}
.btn-success {
  background-color: var(--success);
  color: white;
}
.btn-danger {
  background-color: var(--danger);
  color: white;
}
.btn-outline {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-main);
}
.btn-outline:hover {
  background: var(--background);
}

.action-bar {
  display: flex;
  gap: 1rem;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

/* Cost Estimation Summary */
.cost-summary {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
.summary-box {
  background: #f8fafc;
  padding: 1rem;
  border-radius: var(--radius);
  text-align: center;
  border: 1px solid var(--border);
}
.summary-label {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}
.summary-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
}

/* Utilities */
.text-right { text-align: right; }
.mt-4 { margin-top: 1rem; }
.mb-4 { margin-bottom: 1rem; }

.comment-box {
  background: #f8fafc;
  padding: 10px;
  border-radius: 4px;
  border: 1px solid #e2e8f0;
}
.comment-sig {
  margin-top: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
}