:root {
  --primary-orange: #F26522;
  --primary-hover: #D95316;
  --dark-neutral: #1A1A1A;
  --light-bg: #F9FAFB;
  --border-color: #E5E7EB;
  --input-border: #D1D5DB;
  --text-primary: #1F2937;
  --text-muted: #6B7280;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--light-bg);
  color: var(--text-primary);
  line-height: 1.5;
}

/* Header */
.app-header {
  background-color: #FFFFFF;
  border-bottom: 2px solid var(--border-color);
  padding: 1rem 2rem;
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.header-container .logo {
  height: 52px;
  width: auto;
}

.header-container h2 {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--dark-neutral);
}

/* Main Layout */
.main-container {
  max-width: 1200px;
  margin: 2rem auto;
  padding: 0 1.5rem;
}

/* Tabs Navigation */
.tabs-nav {
  display: flex;
  gap: 0.5rem;
  border-bottom: 2px solid var(--border-color);
  margin-bottom: 1.5rem;
}

.tab-btn {
  background: transparent;
  border: none;
  padding: 0.75rem 1.25rem;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  border-bottom: 3px solid transparent;
  transition: all 0.2s ease;
}

.tab-btn:hover {
  color: var(--primary-orange);
}

.tab-btn.active {
  color: var(--primary-orange);
  border-bottom-color: var(--primary-orange);
}

/* Tab Content Areas */
.tab-content {
  display: none;
}

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

/* Form Sections */
.form-section {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: 0 1px 3px rgba(0,0,0,0.02);
}

.form-section legend {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--dark-neutral);
  padding: 0 0.5rem;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem 1.5rem;
  margin-top: 1rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.form-group.full-width {
  grid-column: 1 / -1;
}

label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  transition: color 0.2s ease;
}

input[type="text"],
input[type="email"],
input[type="tel"],
input[type="number"],
select,
textarea {
  padding: 0.65rem 0.85rem;
  border: 1px solid var(--input-border);
  border-radius: 6px;
  font-size: 0.95rem;
  outline: none;
  transition: border-color 0.15s ease, background-color 0.15s ease, box-shadow 0.15s ease;
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--primary-orange);
  box-shadow: 0 0 0 3px rgba(242, 101, 34, 0.15);
}

/* Required Field Validation Highlighting */
label.field-error {
  color: #DC2626 !important;
  font-weight: 700 !important;
}

input.input-error,
select.input-error {
  border: 2px solid #DC2626 !important;
  background-color: #FEF2F2 !important;
  box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.15) !important;
}

/* Autocomplete List */
.autocomplete-list {
  list-style: none;
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  margin-top: 0.25rem;
  max-height: 200px;
  overflow-y: auto;
  box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}

.autocomplete-list li {
  padding: 0.65rem 0.85rem;
  cursor: pointer;
  border-bottom: 1px solid var(--border-color);
}

.autocomplete-list li:hover {
  background-color: var(--light-bg);
  color: var(--primary-orange);
}

/* Buttons */
.form-actions {
  display: flex;
  gap: 1rem;
  margin-top: 1.5rem;
}

.btn {
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 6px;
  cursor: pointer;
  border: none;
  transition: background-color 0.2s ease;
}

.primary-btn {
  background-color: var(--primary-orange);
  color: #FFFFFF;
}

.primary-btn:hover {
  background-color: var(--primary-hover);
}

.secondary-btn {
  background-color: #E5E7EB;
  color: var(--dark-neutral);
}

.secondary-btn:hover {
  background-color: #D1D5DB;
}

/* Data Table */
.table-container {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  overflow-x: auto;
  box-shadow: 0 1px 3px rgba(0,0,0,0.02);
}

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

th {
  background-color: var(--light-bg);
  padding: 0.85rem 1rem;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border-color);
  text-transform: uppercase;
}

td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.925rem;
}

tr:hover {
  background-color: #F9FAFB;
}