/* DecodingAI4Families — Shared Stylesheet */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  background: #0D1B2A;
  color: #fff;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
}

/* NAV */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: #0D1B2A;
  border-bottom: 1px solid #1e3a5f;
  z-index: 1000;
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.nav-logo {
  color: #FF6B35;
  font-size: 1.3rem;
  font-weight: 700;
  text-decoration: none;
  flex-shrink: 0;
}
.nav-links a {
  color: #8B9DC3;
  text-decoration: none;
  margin-left: 1.5rem;
  transition: color 0.2s;
  font-size: 0.95rem;
}
.nav-links a:hover { color: #FF6B35; }
.nav-links .yt-link { color: #FF6B35; }

main { padding-top: 64px; }

/* HERO */
.hero {
  background: linear-gradient(135deg, #0D1B2A 0%, #162840 100%);
  padding: 5rem 2rem;
  text-align: center;
}
.hero h1 {
  font-size: 3rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 1rem;
  line-height: 1.15;
}
.hero p {
  font-size: 1.2rem;
  color: #8B9DC3;
  max-width: 600px;
  margin: 0 auto 2rem;
  line-height: 1.6;
}
.hero-btns { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }

/* BUTTONS */
.btn {
  display: inline-block;
  padding: 0.8rem 1.8rem;
  border-radius: 6px;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s;
  cursor: pointer;
  border: none;
  font-size: 1rem;
}
.btn-primary { background: #FF6B35; color: #fff; }
.btn-primary:hover { background: #e55a25; }
.btn-secondary { background: transparent; color: #8B9DC3; border: 1px solid #8B9DC3; }
.btn-secondary:hover { color: #fff; border-color: #fff; }

/* SECTIONS */
.section { padding: 4rem 2rem; }
.section-title { font-size: 1.8rem; font-weight: 700; color: #fff; margin-bottom: 0.5rem; }
.section-subtitle { color: #8B9DC3; margin-bottom: 2rem; }
.container { max-width: 1100px; margin: 0 auto; }

/* CARD GRID */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}
.card {
  background: #162840;
  border-radius: 10px;
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  transition: transform 0.2s, border-color 0.2s;
  border: 1px solid transparent;
  display: block;
}
.card:hover { transform: translateY(-3px); border-color: #FF6B35; }
.card-thumb { width: 100%; aspect-ratio: 16/9; object-fit: cover; display: block; }
.card-body { padding: 1rem; }
.topic-badge {
  display: inline-block;
  background: #FF6B35;
  color: #fff;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  margin-bottom: 0.5rem;
}
.badge-safety   { background: #c0392b; }
.badge-privacy  { background: #1a6b9a; }
.badge-literacy { background: #27ae60; }
.badge-social   { background: #8e44ad; }
.badge-toolkit  { background: #d68910; }
.badge-learning { background: #16a085; }

.card-title { font-size: 1rem; font-weight: 600; color: #fff; line-height: 1.4; }
.card-meta { color: #8B9DC3; font-size: 0.85rem; margin-top: 0.4rem; }

/* TOPIC GRID */
.topic-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}
.topic-card {
  background: #162840;
  border-radius: 10px;
  padding: 1.5rem;
  text-decoration: none;
  color: inherit;
  transition: all 0.2s;
  border: 1px solid transparent;
  display: block;
}
.topic-card:hover { border-color: #FF6B35; transform: translateY(-2px); }
.topic-card h3 { color: #FF6B35; font-size: 1.1rem; margin-bottom: 0.5rem; }
.topic-card p { color: #8B9DC3; font-size: 0.9rem; line-height: 1.5; }
.topic-card .count { color: #8B9DC3; font-size: 0.85rem; margin-top: 1rem; }

/* FEATURED */
.featured { background: #162840; padding: 4rem 2rem; }
.featured-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
  max-width: 1100px;
  margin: 0 auto;
}
.featured-embed { border-radius: 10px; overflow: hidden; }
.featured-embed iframe { display: block; }
.featured-meta { color: #8B9DC3; font-size: 0.9rem; margin-bottom: 1rem; }
.featured-title { font-size: 1.8rem; font-weight: 700; color: #fff; margin-bottom: 1rem; line-height: 1.3; }
.featured-desc { color: #8B9DC3; line-height: 1.7; margin-bottom: 1.5rem; }

/* EMAIL CTA */
.email-cta {
  background: linear-gradient(135deg, #162840, #0D1B2A);
  padding: 4rem 2rem;
  text-align: center;
}
.email-cta h2 { font-size: 2rem; font-weight: 700; color: #fff; margin-bottom: 1rem; }
.email-cta p { color: #8B9DC3; margin-bottom: 2rem; }
.email-form {
  display: flex;
  gap: 1rem;
  max-width: 480px;
  margin: 0 auto;
  flex-wrap: wrap;
}
.email-form input {
  flex: 1;
  padding: 0.8rem 1rem;
  border-radius: 6px;
  border: 1px solid #1e3a5f;
  background: #0D1B2A;
  color: #fff;
  font-size: 1rem;
  min-width: 200px;
}
.email-form input::placeholder { color: #8B9DC3; }
.email-form button { background: #FF6B35; color: #fff; border: none; cursor: pointer; }
.email-form button:hover { background: #e55a25; }

/* FOOTER */
footer {
  background: #0a1520;
  border-top: 1px solid #1e3a5f;
  padding: 3rem 2rem 1.5rem;
}
.footer-inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 2rem;
  max-width: 1100px;
  margin: 0 auto;
}
.footer-logo { color: #FF6B35; font-size: 1.2rem; font-weight: 700; margin-bottom: 0.5rem; }
.footer-tagline { color: #8B9DC3; font-size: 0.85rem; line-height: 1.5; max-width: 320px; }
footer h4 { color: #fff; font-weight: 600; margin-bottom: 1rem; }
footer a {
  color: #8B9DC3;
  text-decoration: none;
  display: block;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
}
footer a:hover { color: #FF6B35; }
.footer-bottom {
  border-top: 1px solid #1e3a5f;
  margin-top: 2rem;
  padding-top: 1.5rem;
  text-align: center;
  color: #8B9DC3;
  font-size: 0.85rem;
  max-width: 1100px;
  margin-left: auto;
  margin-right: auto;
}

/* BREADCRUMB */
.breadcrumb { color: #8B9DC3; font-size: 0.9rem; margin-bottom: 1.5rem; }
.breadcrumb a { color: #8B9DC3; text-decoration: none; }
.breadcrumb a:hover { color: #FF6B35; }
.breadcrumb span { color: #8B9DC3; }

/* VIDEO PAGE */
.video-page { padding: 2rem; }
.video-embed { border-radius: 10px; overflow: hidden; margin-bottom: 2rem; }
.article-body { color: #8B9DC3; line-height: 1.8; font-size: 1rem; max-width: 720px; }
.article-body p { margin-bottom: 1rem; }
.article-body h2 { color: #fff; font-size: 1.4rem; margin: 1.5rem 0 0.75rem; }

/* EBOOK CTA */
.ebook-cta {
  background: linear-gradient(135deg, #FF6B35, #e55a25);
  border-radius: 10px;
  padding: 2rem;
  text-align: center;
  margin: 2rem 0;
  max-width: 720px;
}
.ebook-cta h3 { color: #fff; margin-bottom: 0.5rem; font-size: 1.3rem; }
.ebook-cta p { color: rgba(255,255,255,0.85); margin-bottom: 1rem; }
.ebook-cta a { background: #fff; color: #FF6B35; font-weight: 700; }
.ebook-cta a:hover { background: #f0f0f0; }

/* RELATED GRID */
.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1rem;
}

/* TOPIC HERO */
.topic-hero {
  padding: 3rem 2rem;
  background: linear-gradient(135deg, #0D1B2A, #162840);
}
.topic-hero h1 { font-size: 2.2rem; font-weight: 800; color: #fff; margin-bottom: 0.5rem; }
.topic-hero p { color: #8B9DC3; font-size: 1.1rem; max-width: 600px; }
.back-link { display: inline-block; color: #8B9DC3; text-decoration: none; margin-bottom: 1.5rem; font-size: 0.9rem; }
.back-link:hover { color: #FF6B35; }

/* FILTER BAR */
.filter-bar { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 2rem; }
.filter-btn {
  padding: 0.4rem 1rem;
  border-radius: 20px;
  border: 1px solid #1e3a5f;
  background: transparent;
  color: #8B9DC3;
  font-size: 0.85rem;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.2s;
}
.filter-btn:hover, .filter-btn.active { background: #FF6B35; border-color: #FF6B35; color: #fff; }

/* VIDEO HERO META */
.video-hero-meta { margin-bottom: 1.5rem; }
.video-hero-meta h1 { font-size: 2rem; font-weight: 800; color: #fff; margin: 0.5rem 0 1rem; line-height: 1.25; }

/* ABOUT / STATIC PAGES */
.page-hero {
  padding: 4rem 2rem;
  background: linear-gradient(135deg, #0D1B2A, #162840);
  text-align: center;
}
.page-hero h1 { font-size: 2.5rem; font-weight: 800; color: #fff; margin-bottom: 1rem; }
.page-hero p { color: #8B9DC3; font-size: 1.1rem; max-width: 600px; margin: 0 auto; }
.page-content { padding: 3rem 2rem; }
.page-content h2 { color: #fff; font-size: 1.5rem; margin: 2rem 0 1rem; }
.page-content p { color: #8B9DC3; line-height: 1.8; margin-bottom: 1rem; max-width: 720px; }
.page-content ul { color: #8B9DC3; line-height: 1.8; margin-bottom: 1rem; max-width: 720px; padding-left: 1.5rem; }
.page-content li { margin-bottom: 0.4rem; }
.page-content a { color: #FF6B35; }
.page-content a:hover { text-decoration: underline; }
.stat-chips { display: flex; flex-wrap: wrap; gap: 1rem; margin: 2rem 0; }
.stat-chip {
  background: #162840;
  border: 1px solid #1e3a5f;
  border-radius: 8px;
  padding: 1rem 1.5rem;
  min-width: 180px;
}
.stat-chip .num { font-size: 1.8rem; font-weight: 800; color: #FF6B35; }
.stat-chip .label { color: #8B9DC3; font-size: 0.85rem; margin-top: 0.25rem; }
.contact-card {
  background: #162840;
  border-radius: 10px;
  padding: 2rem;
  max-width: 480px;
  margin-bottom: 2rem;
}
.contact-card h3 { color: #fff; margin-bottom: 1rem; }
.contact-card p { color: #8B9DC3; margin-bottom: 0.5rem; }
.contact-card a { color: #FF6B35; }

/* RESPONSIVE */
@media (max-width: 768px) {
  .hero h1 { font-size: 2rem; }
  .hero p { font-size: 1rem; }
  .featured-inner { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; }
  .nav-links { display: none; }
  .page-hero h1 { font-size: 1.8rem; }
  .video-hero-meta h1 { font-size: 1.5rem; }
  .featured-title { font-size: 1.4rem; }
  .email-cta h2 { font-size: 1.5rem; }
}