:root {
  /* Wireframe Palette - Grayscale only */
  --wf-white: #ffffff;
  --wf-gray-50: #f9fafb;
  --wf-gray-100: #f3f4f6;
  --wf-gray-200: #e5e7eb;
  --wf-gray-300: #d1d5db;
  --wf-gray-400: #9ca3af;
  --wf-gray-500: #6b7280;
  --wf-gray-600: #4b5563;
  --wf-gray-700: #374151;
  --wf-gray-800: #1f2937;
  --wf-gray-900: #111827;
  --wf-black: #000000;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 4rem;

  /* Borders & Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --border-width: 2px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background-color: var(--wf-white);
  color: var(--wf-gray-900);
  line-height: 1.5;
}

/* Layout */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

header {
  border-bottom: var(--border-width) solid var(--wf-gray-200);
  padding: var(--space-sm) 0;
  background: var(--wf-white);
}

.nav-wrapper {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-weight: 800;
  font-size: 1.5rem;
  text-transform: uppercase;
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  gap: var(--space-md);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  text-decoration: none;
  color: var(--wf-gray-600);
  font-weight: 500;
  font-size: 0.875rem;
}

.nav-links a:hover {
  color: var(--wf-black);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.875rem;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.2s;
  border: var(--border-width) solid var(--wf-gray-900);
}

.btn-primary {
  background: var(--wf-gray-900);
  color: var(--wf-white);
}

.btn-outline {
  background: transparent;
  color: var(--wf-gray-900);
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.75rem;
}

/* Hero Section */
.hero {
  padding: var(--space-xl) 0;
  border-bottom: var(--border-width) solid var(--wf-gray-200);
  background: var(--wf-gray-50);
}

.hero-content {
  max-width: 600px;
}

.hero h1 {
  font-size: 3.5rem;
  margin: 0 0 var(--space-sm);
  line-height: 1.1;
  letter-spacing: -0.03em;
}

.hero p {
  font-size: 1.25rem;
  color: var(--wf-gray-600);
  margin-bottom: var(--space-md);
}

/* Grid & Cards */
.section-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: var(--space-lg);
  margin-top: var(--space-xl);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
}

.card {
  border: var(--border-width) solid var(--wf-gray-200);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color 0.2s;
}

.card:hover {
  border-color: var(--wf-black);
}

.placeholder-image {
  width: 100%;
  background: var(--wf-gray-100);
  aspect-ratio: 16/9;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.placeholder-image::after {
  content: "IMAGE PLACEHOLDER";
  font-size: 0.75rem;
  color: var(--wf-gray-400);
  font-weight: 600;
}

.card-body {
  padding: var(--space-md);
}

.card-tag {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 2px 6px;
  background: var(--wf-gray-100);
  margin-bottom: var(--space-xs);
}

.card-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin: 0 0 var(--space-xs);
}

.card-meta {
  font-size: 0.875rem;
  color: var(--wf-gray-500);
  margin-bottom: var(--space-sm);
}

/* Placeholders & Icons */
.placeholder-icon {
  width: 24px;
  height: 24px;
  background: var(--wf-gray-200);
  display: inline-block;
  border-radius: var(--radius-sm);
}

.placeholder-avatar {
  width: 40px;
  height: 40px;
  background: var(--wf-gray-200);
  border-radius: 50%;
}

/* Sidebar Layout */
.with-sidebar {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: var(--space-xl);
  min-height: calc(100vh - 80px);
}

.sidebar {
  border-right: var(--border-width) solid var(--wf-gray-200);
  padding: var(--space-lg) var(--space-md) var(--space-lg) 0;
}

.sidebar-nav {
  list-style: none;
  padding: 0;
  margin: 0;
}

.sidebar-nav li {
  margin-bottom: var(--space-xs);
}

.sidebar-nav a {
  display: block;
  padding: 0.75rem;
  text-decoration: none;
  color: var(--wf-gray-600);
  border-radius: var(--radius-sm);
  font-weight: 500;
}

.sidebar-nav a.active {
  background: var(--wf-gray-100);
  color: var(--wf-black);
}

/* Tables */
.table-container {
  overflow-x: auto;
  border: var(--border-width) solid var(--wf-gray-200);
  border-radius: var(--radius-md);
}

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

th {
  background: var(--wf-gray-50);
  padding: var(--space-sm);
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--wf-gray-500);
  border-bottom: var(--border-width) solid var(--wf-gray-200);
}

td {
  padding: var(--space-sm);
  border-bottom: 1px solid var(--wf-gray-100);
  font-size: 0.875rem;
}

/* Forms */
.form-group {
  margin-bottom: var(--space-md);
}

label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: var(--space-xs);
}

.form-input {
  width: 100%;
  padding: 0.75rem;
  border: var(--border-width) solid var(--wf-gray-200);
  border-radius: var(--radius-sm);
  font-family: inherit;
}

/* Footer */
footer {
  border-top: var(--border-width) solid var(--wf-gray-200);
  padding: var(--space-xl) 0;
  margin-top: var(--space-xl);
  background: var(--wf-gray-50);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-xl);
}

.footer-col h4 {
  margin: 0 0 var(--space-md);
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links li {
  margin-bottom: var(--space-xs);
}

.footer-links a {
  text-decoration: none;
  color: var(--wf-gray-500);
  font-size: 0.875rem;
}

/* Utility */
.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 99px;
  font-size: 0.7rem;
  font-weight: 700;
  background: var(--wf-gray-200);
}