:root {
  --color-adidas: #000000;
  --color-puma: #e10600;
  --color-bg: #f8f9fa;
  --color-surface: #ffffff;
  --color-border: #e2e8f0;
  --color-text: #1a202c;
  --color-text-muted: #4a5568;
  
  --font-display: 'Oswald', sans-serif;
  --font-body: 'Inter', sans-serif;
  
  --wf-space-xs: 8px;
  --wf-space-sm: 16px;
  --wf-space-md: 24px;
  --wf-space-lg: 32px;
  --wf-space-xl: 64px;
  --wf-space-2xl: 96px;
  
  --radius-md: 12px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
}

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

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-body);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  overflow-x: hidden;
}

h1, h2, h3 {
  font-family: var(--font-display);
  text-transform: uppercase;
  margin: 0;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 clamp(1rem, 5vw, 4rem);
}

/* Header & Nav */
header {
  background: var(--color-surface);
  border-bottom: 2px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
}

.nav-brand {
  font-family: var(--font-display);
  font-size: 1.5rem;
  letter-spacing: -1px;
}

.nav-links {
  display: flex;
  gap: var(--wf-space-md);
}

.nav-links a {
  text-decoration: none;
  color: var(--color-text);
  font-weight: 600;
  font-size: 0.9rem;
  text-transform: uppercase;
}

/* Hero Section */
.hero {
  padding: var(--wf-space-2xl) 0;
  text-align: center;
  background: linear-gradient(135deg, #fff 0%, #eee 100%);
  position: relative;
  overflow: hidden;
}

.hero h1 {
  font-size: clamp(3rem, 10vw, 6rem);
  line-height: 0.9;
  margin-bottom: var(--wf-space-md);
}

.hero p {
  font-size: 1.25rem;
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto;
}

/* Section Styling */
section {
  margin-top: var(--wf-space-xl);
  padding: var(--wf-space-lg) 0;
}

.section-title {
  margin-bottom: var(--wf-space-lg);
  display: flex;
  align-items: center;
  gap: var(--wf-space-sm);
}

.section-title h2 {
  font-size: 2.5rem;
}

.section-title .number {
  font-family: var(--font-display);
  color: var(--color-text-muted);
  font-size: 2.5rem;
  opacity: 0.3;
}

/* Comparison Grid */
.dual-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--wf-space-lg);
}

.side-card {
  background: var(--color-surface);
  padding: var(--wf-space-lg);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  border-top: 6px solid var(--color-text);
}

.side-card.puma {
  border-top-color: var(--color-puma);
}

.side-card h3 {
  font-size: 1.75rem;
  margin-bottom: var(--wf-space-sm);
}

/* Table */
.table-wrapper {
  overflow-x: auto;
  background: var(--color-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  margin-top: var(--wf-space-md);
}

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

th, td {
  padding: var(--wf-space-md);
  border-bottom: 1px solid var(--color-border);
}

th {
  background: #f1f5f9;
  font-family: var(--font-display);
  text-transform: uppercase;
  font-size: 0.85rem;
  letter-spacing: 1px;
}

.col-label { font-weight: 600; width: 25%; }
.col-adidas { font-weight: 700; }
.col-puma { font-weight: 700; color: var(--color-puma); }

/* Timeline / Story */
.story-item {
  position: relative;
  padding-left: 32px;
  margin-bottom: var(--wf-space-md);
  border-left: 2px solid var(--color-border);
}

.story-item::before {
  content: '';
  position: absolute;
  left: -7px;
  top: 8px;
  width: 12px;
  height: 12px;
  background: var(--color-text);
  border-radius: 50%;
}

/* Metrics Cards */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--wf-space-md);
}

.metric-card {
  background: var(--color-surface);
  padding: var(--wf-space-lg);
  border-radius: var(--radius-md);
  text-align: center;
}

.metric-value {
  display: block;
  font-family: var(--font-display);
  font-size: 2.5rem;
  line-height: 1;
  margin-bottom: var(--wf-space-xs);
}

.metric-label {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--color-text-muted);
}

/* Brand Accents */
.adidas-accent { border-left: 4px solid var(--color-adidas); padding-left: var(--wf-space-md); }
.puma-accent { border-left: 4px solid var(--color-puma); padding-left: var(--wf-space-md); }

.bg-dark { background: var(--color-adidas); color: white; }
.bg-puma { background: var(--color-puma); color: white; }

.btn {
  display: inline-block;
  padding: 12px 24px;
  background: var(--color-adidas);
  color: white;
  text-decoration: none;
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: 1px;
  border-radius: 4px;
  transition: opacity 0.2s;
}

.btn:hover { opacity: 0.9; }

.btn.btn-outline {
  background: transparent;
  border: 2px solid currentColor;
  color: inherit;
}

/* Placeholder Utility */
.placeholder-image {
  width: 100%;
  aspect-ratio: 16/9;
  background: #e2e8f0;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  position: relative;
  overflow: hidden;
}

.placeholder-image::after {
  content: attr(data-label);
  font-family: var(--font-display);
  text-transform: uppercase;
  font-size: 0.8rem;
  opacity: 0.5;
}

/* List Styling */
ul.feature-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

ul.feature-list li {
  padding: var(--wf-space-sm) 0;
  border-bottom: 1px solid #f1f5f9;
  display: flex;
  align-items: flex-start;
  gap: var(--wf-space-sm);
}

ul.feature-list li::before {
  content: '→';
  font-weight: bold;
}

/* Footer */
footer {
  margin-top: var(--wf-space-2xl);
  background: var(--color-text);
  color: white;
  padding: var(--wf-space-xl) 0;
  text-align: center;
}

.conclusion-box {
  background: rgba(255,255,255,0.05);
  padding: var(--wf-space-lg);
  border-radius: var(--radius-md);
  max-width: 800px;
  margin: 0 auto;
  border: 1px solid rgba(255,255,255,0.1);
}

/* Responsive */
@media (max-width: 768px) {
  .dual-grid { grid-template-columns: 1fr; }
  .section-title h2 { font-size: 1.75rem; }
}