/* ===== RESET ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

/* ===== CUSTOM PROPERTIES ===== */
:root {
  --color-bg:       #faf8f5;
  --color-card:     #ffffff;
  --color-text:     #1a1a2e;
  --color-accent:   #b07828;
  --color-accent2:  #8b5e1a;
  --color-muted:    #6e7681;
  --color-subtle:   #8b949e;
  --color-border:   #e8e4dc;
  --color-tag-bg:   #f5f2ed;

  --font-mono:      'Courier New', Courier, monospace;
  --font-sans:      -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;

  --width-max:      720px;
  --gap-section:    40px;
}

/* ===== BASE ===== */
html {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  -webkit-font-smoothing: antialiased;
}

body {
  max-width: var(--width-max);
  margin: 0 auto;
  padding: 32px 20px;
}

/* ===== NAV ===== */
.nav {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 40px;
}

.nav-wordmark {
  display: flex;
  align-items: center;
  gap: 6px;
  text-decoration: none;
  color: inherit;
}

.nav-icon {
  flex-shrink: 0;
}

.wordmark {
  font-family: var(--font-mono);
  font-size: 24px;
  line-height: 1;
}

.wordmark-tensor {
  font-weight: 700;
  color: var(--color-text);
}

.wordmark-binge {
  font-weight: 400;
  color: var(--color-subtle);
}

.nav-links {
  margin-left: auto;
  display: flex;
  gap: 16px;
}

.nav-link {
  font-size: 13px;
  color: var(--color-accent2);
  text-decoration: none;
}

.nav-link:hover {
  color: var(--color-accent);
}

/* ===== THESIS ===== */
.thesis {
  font-size: 34px;
  font-weight: 300;
  line-height: 1.3;
  letter-spacing: -0.3px;
  max-width: 540px;
  margin-bottom: 36px;
}

.thesis-accent {
  border-bottom: 2.5px solid var(--color-accent);
}

/* ===== SECTIONS ===== */
.section {
  margin-bottom: var(--gap-section);
}

.eyebrow {
  font-size: 12px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--color-subtle);
  margin-bottom: 14px;
}

/* ===== PRODUCT GRID ===== */
.product-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 12px;
}

.product-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.product-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(139, 94, 26, 0.08);
  border-color: var(--color-accent);
}

.product-header {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 8px;
}

.product-monogram {
  width: 22px;
  height: 22px;
  border: 1.5px solid var(--color-accent2);
  border-radius: 3px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 600;
  color: var(--color-accent2);
  flex-shrink: 0;
}

.product-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
}

.product-desc {
  font-size: 13px;
  color: var(--color-muted);
  line-height: 1.5;
  margin-bottom: 8px;
}

.product-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  align-items: center;
}

.product-badges img {
  display: block;
}

.badge-apple {
  height: 32px;
}

/* ===== DIVIDER ===== */
.divider {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 32px;
}

.divider-line {
  flex: 1;
  height: 1px;
  background: var(--color-border);
}

.divider-graph {
  flex-shrink: 0;
}

/* ===== RESEARCH GRID ===== */
.research-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 16px;
}

.research-heading {
  font-size: 22px;
  font-weight: 300;
  color: var(--color-accent2);
  margin-bottom: 6px;
}

.research-desc {
  font-size: 13px;
  color: var(--color-muted);
  line-height: 1.5;
}

/* ===== RESPONSIVE: Tablet ===== */
@media (max-width: 768px) {
  .product-grid {
    grid-template-columns: 1fr 1fr;
  }

  .research-grid {
    grid-template-columns: 1fr 1fr;
  }

  .thesis {
    font-size: 28px;
  }
}

/* ===== RESPONSIVE: Mobile ===== */
@media (max-width: 480px) {
  body {
    padding: 24px 16px;
  }

  .nav {
    margin-bottom: 28px;
  }

  .thesis {
    font-size: 22px;
    margin-bottom: 24px;
  }

  .product-grid {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .research-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .section {
    margin-bottom: 28px;
  }

  .nav-links {
    gap: 12px;
  }
}

/* ===== REDUCED MOTION ===== */
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}

/* ===== SKIP LINK ===== */
.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  background: var(--color-accent2);
  color: #fff;
  padding: 8px 16px;
  font-size: 14px;
  z-index: 1000;
  border-radius: 4px;
  text-decoration: none;
}

.skip-link:focus {
  top: 16px;
}