/* ==========================================================================
   Shtecks LLC — Clean & Minimal Design System
   ========================================================================== */

:root {
  /* Restrained neutral palette with subtle accent */
  --bg-primary: #fcfcfd;
  --bg-secondary: #f4f5f7;
  --bg-subtle: #ffffff;
  --text-primary: #12151a;
  --text-secondary: #4a5568;
  --text-muted: #718096;
  --border-light: #e2e8f0;
  --border-subtle: #edf2f7;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-subtle: rgba(37, 99, 235, 0.08);
  --focus-ring: #3b82f6;
  --badge-bg: #eef2ff;
  --badge-text: #3730a3;
  --badge-border: #c7d2fe;

  /* Distinct light category colors (Light Mode) */
  --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);
  --learning-hover-border: #10b981;
  --learning-shadow: rgba(16, 185, 129, 0.12);

  --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);
  --applications-hover-border: #8b5cf6;
  --applications-shadow: rgba(139, 92, 246, 0.12);

  --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);
  --services-hover-border: #3b82f6;
  --services-shadow: rgba(37, 99, 235, 0.12);

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --line-height-normal: 1.5;
  --line-height-tight: 1.25;
  --line-height-relaxed: 1.65;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-primary: #0b0d10;
    --bg-secondary: #14171d;
    --bg-subtle: #1a1e26;
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    --border-light: #242a35;
    --border-subtle: #1c212a;
    --accent: #60a5fa;
    --accent-hover: #93c5fd;
    --accent-subtle: rgba(96, 165, 250, 0.12);
    --focus-ring: #60a5fa;
    --badge-bg: #1e1b4b;
    --badge-text: #c7d2fe;
    --badge-border: #312e81;

    /* Distinct light category colors (Dark Mode) */
    --learning-accent: #34d399;
    --learning-bg: rgba(16, 185, 129, 0.08);
    --learning-border: rgba(16, 185, 129, 0.28);
    --learning-hover-bg: rgba(16, 185, 129, 0.16);
    --learning-hover-border: #34d399;
    --learning-shadow: rgba(52, 211, 153, 0.18);

    --applications-accent: #a78bfa;
    --applications-bg: rgba(139, 92, 246, 0.08);
    --applications-border: rgba(139, 92, 246, 0.28);
    --applications-hover-bg: rgba(139, 92, 246, 0.16);
    --applications-hover-border: #a78bfa;
    --applications-shadow: rgba(167, 139, 250, 0.18);

    --services-accent: #60a5fa;
    --services-bg: rgba(37, 99, 235, 0.08);
    --services-border: rgba(37, 99, 235, 0.28);
    --services-hover-bg: rgba(37, 99, 235, 0.16);
    --services-hover-border: #60a5fa;
    --services-shadow: rgba(96, 165, 250, 0.18);
  }
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 100%;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

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

/* Accessibility: Focus styles */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ==========================================================================
   Homepage Layout
   Strictly: Shtecks, positioning line, 3 prominent category links, footer
   ========================================================================== */

/* White background specifically for homepage */
body.home-page {
  background-color: #ffffff;
}

.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);
}

.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); /* forward-leaning momentum */
  transform-origin: left bottom;
}

/* Rainbow brand characters */
.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(1.125rem, 2.5vw, 1.35rem);
  font-weight: 500;
  color: #0f172a; /* Deep high-contrast tone */
  line-height: var(--line-height-relaxed);
  letter-spacing: -0.01em;
}

/* High visibility overrides for homepage text */
.home-page .brand-positioning {
  color: #0f172a;
}

.home-page .category-link-title {
  color: #090d16;
  font-weight: 700;
}

.home-page .category-link-arrow {
  color: #334155;
  font-weight: 600;
}

.home-page .site-footer {
  color: #334155;
  font-weight: 500;
  border-top-color: #cbd5e1;
}

/* Prominent category links */
.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);
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-light);
  border-radius: 10px;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.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: 600;
  letter-spacing: -0.02em;
}

.category-link-arrow {
  font-size: 1.5rem;
  font-weight: 400;
  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 (Fresh Emerald / Mint) */
.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-hover-border);
  box-shadow: 0 6px 20px var(--learning-shadow);
  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 (Soft 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-hover-border);
  box-shadow: 0 6px 20px var(--applications-shadow);
  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 / Azure) */
.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-hover-border);
  box-shadow: 0 6px 20px var(--services-shadow);
  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);
}

.category-link:active {
  transform: translateY(0);
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  .category-link,
  .category-link-arrow,
  .rainbow-char {
    transition: none !important;
    transform: none !important;
  }
  .category-link:hover {
    transform: none !important;
  }
}

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

.footer-contact {
  color: inherit;
}

.contact-email-link {
  color: var(--services-accent);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.15s ease, text-decoration 0.15s ease;
}

.contact-email-link:hover {
  text-decoration: underline;
}

.home-page .contact-email-link {
  color: #2563eb;
  font-weight: 500;
}

.home-page .contact-email-link:hover {
  color: #1d4ed8;
}

/* ==========================================================================
   Secondary Pages Layout
   ========================================================================== */

.page-container {
  flex: 1;
  max-width: 820px;
  width: 100%;
  margin: 0 auto;
  padding: 2rem 1.5rem 3rem 1.5rem;
  display: flex;
  flex-direction: column;
}

.page-header-nav {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-bottom: 3rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-light);
}

@media (min-width: 640px) {
  .page-header-nav {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

.home-return-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: -0.01em;
}

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

.subpage-nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.subpage-nav-item {
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  color: var(--text-secondary);
  padding: 0.35rem 0.65rem;
  border-radius: 6px;
  transition: all 0.15s ease-in-out;
}

.subpage-nav-item:hover {
  color: var(--text-primary);
  background-color: var(--bg-secondary);
}

.subpage-nav-item.active {
  color: var(--accent);
  background-color: var(--accent-subtle);
  font-weight: 600;
}

/* Page Content Typography */
.page-title {
  font-size: clamp(2rem, 4.5vw, 2.75rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.page-description {
  font-size: 1.125rem;
  color: var(--text-secondary);
  line-height: var(--line-height-relaxed);
  margin-bottom: 2.5rem;
  max-width: 680px;
}

/* Content Sections */
.content-section {
  margin-bottom: 2.75rem;
}

.section-title {
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

/* Placeholder & Developer Notice Banners */
.dev-notice {
  background-color: var(--bg-secondary);
  border-left: 3px solid var(--accent);
  padding: 1rem 1.25rem;
  margin-bottom: 2rem;
  border-radius: 0 6px 6px 0;
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: var(--line-height-relaxed);
}

.dev-notice strong {
  color: var(--text-primary);
}

.status-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.2rem 0.55rem;
  border-radius: 4px;
  background-color: var(--badge-bg);
  color: var(--badge-text);
  border: 1px solid var(--badge-border);
  margin-left: 0.5rem;
  vertical-align: middle;
}

/* Learning Page Elements */
.action-box {
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.action-box p {
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
  line-height: var(--line-height-relaxed);
}

.primary-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.25rem;
  background-color: var(--text-primary);
  color: var(--bg-primary);
  text-decoration: none;
  border-radius: 6px;
  font-size: 0.95rem;
  font-weight: 500;
  transition: opacity 0.15s ease-in-out;
}

.primary-btn:hover {
  opacity: 0.9;
}

.qr-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  margin-top: 1rem;
}

.qr-card {
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  padding: 1.5rem;
  text-align: center;
}

.qr-placeholder {
  width: 140px;
  height: 140px;
  margin: 0 auto 1rem auto;
  border: 2px dashed var(--border-light);
  border-radius: 6px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background-color: var(--bg-secondary);
  color: var(--text-muted);
  font-size: 0.8rem;
  gap: 0.35rem;
}

.qr-placeholder svg {
  width: 32px;
  height: 32px;
  stroke: var(--text-muted);
}

.qr-image {
  width: 150px;
  height: 150px;
  margin: 0 auto 1rem auto;
  display: block;
  border-radius: 8px;
  background-color: #ffffff;
  padding: 8px;
  border: 1px solid var(--border-light);
}

.qr-card h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.qr-card p {
  font-size: 0.825rem;
  color: var(--text-muted);
}

/* Applications & Services Item Lists */
.item-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.item-card {
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  padding: 1.25rem 1.5rem;
}

.item-card-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.item-card-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.item-card-desc {
  font-size: 0.925rem;
  color: var(--text-secondary);
  line-height: var(--line-height-relaxed);
}

.placeholder-note {
  font-style: italic;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 0.5rem;
}