/* Case Brief Club - Clean academic aesthetic */
:root {
  --ink: #1a1a1a;
  --ink-soft: #3d3d3d;
  --paper: #faf9f6;
  --paper-warm: #f5f3ee;
  --accent: #005035;   /* Charlotte Green */
  --accent-gold: #A49665; /* Niner Gold */
  --white: #ffffff;
  --border: #e5e2dc;
  --radius: 6px;
  --font-display: 'Cormorant Garamond', Georgia, serif;
  --font-body: 'Source Sans 3', -apple-system, sans-serif;
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --max-width: 720px;
  --max-width-wide: 960px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--ink);
  background: var(--paper);
}

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(250, 249, 246, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  max-width: var(--max-width-wide);
  margin: 0 auto;
}

.nav-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--ink-soft);
  text-decoration: none;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius);
  transition: color 0.2s, background 0.2s;
}

.nav-link:hover {
  color: var(--accent);
  background: rgba(0, 80, 53, 0.06);
}

/* Container */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

/* Hero */
.hero {
  position: relative;
  min-height: 70vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: calc(4rem + 60px) var(--space-md) var(--space-xl);
  background: linear-gradient(180deg, var(--paper-warm) 0%, var(--paper) 100%);
  overflow: hidden;
}

.hero-accent {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--accent) 0%, var(--accent-gold) 100%);
}

.hero-content {
  text-align: center;
  position: relative;
  z-index: 1;
}

.hero-badge {
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 var(--space-sm);
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 6vw, 3.75rem);
  font-weight: 600;
  color: var(--ink);
  margin: 0 0 var(--space-sm);
  letter-spacing: -0.02em;
  line-height: 1.15;
}

.hero-tagline {
  font-size: 1.2rem;
  color: var(--ink-soft);
  margin: 0 0 var(--space-lg);
  max-width: 28ch;
  margin-left: auto;
  margin-right: auto;
}

.hero-cta {
  display: inline-block;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--white);
  background: var(--accent);
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius);
  text-decoration: none;
  transition: background 0.2s, transform 0.15s;
}

.hero-cta:hover {
  background: #003d2a;
  transform: translateY(-1px);
}

/* Sections */
.section {
  padding: var(--space-xl) 0;
}

.section--cream {
  background: var(--paper-warm);
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 600;
  color: var(--ink);
  margin: 0 0 var(--space-lg);
  letter-spacing: -0.02em;
}

.section-intro {
  color: var(--ink-soft);
  margin: -0.5rem 0 var(--space-md);
  max-width: 42ch;
}

/* About */
.about-content .lead {
  font-size: 1.15rem;
  color: var(--ink-soft);
  margin: 0 0 var(--space-md);
}

.about-content p:last-child {
  margin: 0;
}

/* Purpose list */
.purpose-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.purpose-list li {
  position: relative;
  padding-left: 1.75rem;
  margin-bottom: var(--space-sm);
}

.purpose-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-gold);
}

/* Activities grid */
.activities-grid {
  display: grid;
  gap: var(--space-lg);
}

@media (min-width: 640px) {
  .activities-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.activity-card {
  background: var(--white);
  padding: var(--space-lg);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  position: relative;
}

.activity-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--white);
  background: var(--accent);
  border-radius: 50%;
  margin-bottom: var(--space-sm);
}

.activity-card h3 {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 600;
  margin: 0 0 var(--space-sm);
  color: var(--ink);
}

.activity-card ul {
  margin: var(--space-xs) 0;
  padding-left: 1.25rem;
}

.activity-card li {
  margin-bottom: 0.25rem;
}

.activity-note {
  font-size: 0.9rem;
  color: var(--ink-soft);
  margin: var(--space-sm) 0 0;
  font-style: italic;
}

/* Benefits */
.benefits-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: var(--space-sm);
}

@media (min-width: 480px) {
  .benefits-list {
    grid-template-columns: repeat(2, 1fr);
  }
}

.benefits-list li {
  position: relative;
  padding-left: 1.75rem;
}

.benefits-list li::before {
  content: '✓';
  position: absolute;
  left: 0;
  font-weight: 600;
  color: var(--accent);
}

/* Sustainability */
.sustainability-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.sustainability-list li {
  position: relative;
  padding-left: 1.75rem;
  margin-bottom: var(--space-sm);
}

.sustainability-list li::before {
  content: '•';
  position: absolute;
  left: 0;
  font-weight: 600;
  color: var(--accent-gold);
}

/* Footer */
.site-footer {
  padding: var(--space-lg) var(--space-md);
  background: var(--ink);
  color: var(--paper);
  text-align: center;
}

.footer-text {
  margin: 0;
  font-size: 0.9rem;
  opacity: 0.9;
}

/* Responsive nav */
@media (max-width: 520px) {
  .nav {
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-xs);
  }

  .nav-link {
    font-size: 0.85rem;
    padding: var(--space-xs);
  }
}