:root {
  --bg-primary: #ffffff;
  --text-primary: #090d16;
  --text-secondary: #0f172a;
  --text-muted: #334155;
  --border-light: #e2e8f0;

  /* Category Colors */
  --learning-accent: #059669;
  --learning-bg: rgba(16, 185, 129, 0.05);
  --learning-border: rgba(16, 185, 129, 0.22);
  --learning-hover-bg: rgba(16, 185, 129, 0.10);

  --applications-accent: #7c3aed;
  --applications-bg: rgba(139, 92, 246, 0.05);
  --applications-border: rgba(139, 92, 246, 0.22);
  --applications-hover-bg: rgba(139, 92, 246, 0.10);

  --services-accent: #2563eb;
  --services-bg: rgba(37, 99, 235, 0.05);
  --services-border: rgba(37, 99, 235, 0.22);
  --services-hover-bg: rgba(37, 99, 235, 0.10);

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

.home-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  max-width: 760px;
  width: 100%;
  margin: 0 auto;
  padding: clamp(2rem, 5vw, 4rem) 1.5rem 2rem 1.5rem;
}

.home-header {
  margin-top: clamp(2rem, 10vh, 6rem);
  margin-bottom: clamp(3rem, 8vh, 5rem);
}

/* Forward-Leaning Aerodynamic Shtecks Title */
.brand-title {
  font-size: clamp(2.75rem, 6.5vw, 4.25rem);
  font-weight: 800;
  font-style: italic;
  letter-spacing: -0.025em;
  line-height: 1.1;
  margin-bottom: 0.85rem;
  display: inline-block;
  transform: skewX(-4deg);
  transform-origin: left bottom;
}

.rainbow-char {
  display: inline-block;
  font-style: italic;
  transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}
.rainbow-char:hover {
  transform: translateY(-4px) skewX(-4deg);
}

.rainbow-char.r-1 { color: #e11d48; } /* S - Rose Red */
.rainbow-char.r-2 { color: #ea580c; } /* h - Tangerine Orange */
.rainbow-char.r-3 { color: #d97706; } /* t - Amber Gold */
.rainbow-char.r-4 { color: #16a34a; } /* e - Emerald Green */
.rainbow-char.r-5 { color: #0284c7; } /* c - Cerulean Cyan */
.rainbow-char.r-6 { color: #4f46e5; } /* k - Indigo Blue */
.rainbow-char.r-7 { color: #9333ea; } /* s - Royal Violet */

.brand-positioning {
  font-size: clamp(1.15rem, 2.6vw, 1.4rem);
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: -0.01em;
  line-height: 1.6;
}

/* Category Navigation */
.category-nav {
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
  margin-bottom: clamp(3rem, 10vh, 6rem);
}

.category-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.35rem 1.75rem;
  text-decoration: none;
  color: var(--text-primary);
  border: 1px solid var(--border-light);
  border-radius: 10px;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  cursor: pointer;
}

.category-link-content {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.category-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
  flex-shrink: 0;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.category-link-title {
  font-size: clamp(1.25rem, 2.8vw, 1.6rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.category-link-arrow {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-muted);
  transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1), color 0.2s ease;
  margin-left: 1rem;
}

/* Category 1: AI Learning (Mint/Emerald) */
.category-learning {
  background-color: var(--learning-bg);
  border-color: var(--learning-border);
}
.category-learning .category-dot {
  background-color: var(--learning-accent);
}
.category-learning:hover {
  background-color: var(--learning-hover-bg);
  border-color: var(--learning-accent);
  box-shadow: 0 6px 20px rgba(16, 185, 129, 0.15);
  transform: translateY(-2px);
}
.category-learning:hover .category-dot {
  transform: scale(1.3);
  box-shadow: 0 0 10px var(--learning-accent);
}
.category-learning:hover .category-link-arrow {
  color: var(--learning-accent);
  transform: translateX(5px);
}

/* Category 2: AI Applications (Lavender/Violet) */
.category-applications {
  background-color: var(--applications-bg);
  border-color: var(--applications-border);
}
.category-applications .category-dot {
  background-color: var(--applications-accent);
}
.category-applications:hover {
  background-color: var(--applications-hover-bg);
  border-color: var(--applications-accent);
  box-shadow: 0 6px 20px rgba(139, 92, 246, 0.15);
  transform: translateY(-2px);
}
.category-applications:hover .category-dot {
  transform: scale(1.3);
  box-shadow: 0 0 10px var(--applications-accent);
}
.category-applications:hover .category-link-arrow {
  color: var(--applications-accent);
  transform: translateX(5px);
}

/* Category 3: AI Services (Electric Blue) */
.category-services {
  background-color: var(--services-bg);
  border-color: var(--services-border);
}
.category-services .category-dot {
  background-color: var(--services-accent);
}
.category-services:hover {
  background-color: var(--services-hover-bg);
  border-color: var(--services-accent);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.15);
  transform: translateY(-2px);
}
.category-services:hover .category-dot {
  transform: scale(1.3);
  box-shadow: 0 0 10px var(--services-accent);
}
.category-services:hover .category-link-arrow {
  color: var(--services-accent);
  transform: translateX(5px);
}

/* Footer */
.site-footer {
  padding-top: 1.75rem;
  border-top: 1px solid #cbd5e1;
  font-size: 0.875rem;
  color: var(--text-muted);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  font-weight: 500;
}

.contact-email-link {
  color: #2563eb;
  text-decoration: none;
  font-weight: 500;
}
.contact-email-link:hover {
  text-decoration: underline;
  color: #1d4ed8;
}