/**
 * Component and Modular Functional Stylesheets
 */

/* Header & Navigation Engine */
.site-header {
  background-color: var(--dm-surface);
  border-bottom: 1px solid var(--dm-border);
  position: sticky;
  top: 0;
  z-index: 1000;
}
.header-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}
.nav-menu {
  display: flex;
  list-style: none;
  gap: 1.5rem;
}
.nav-menu a {
  font-weight: 500;
  color: var(--dm-text-main);
}
.nav-menu a:hover { color: var(--dm-gold); }

/* Hero Section */
.hero-section {
  background: linear-gradient(135deg, var(--dm-emerald-dark) 0%, var(--dm-emerald) 100%);
  color: #FFFFFF;
  padding: 4rem 0;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: center;
}
@media (min-width: 992px) {
  .hero-grid { grid-template-columns: 1fr 1fr; }
}
.hero-title { font-size: 2.75rem; color: var(--dm-gold-light); margin-bottom: 1rem; }
.hero-tagline { font-size: 1.25rem; opacity: 0.9; margin-bottom: 2rem; }

/* Responsive Video Aspect Ratio Engine (16:9) */
.responsive-video-embed {
  position: relative;
  padding-bottom: 56.25%; /* 16:9 ratio */
  height: 0;
  overflow: hidden;
  border-radius: var(--dm-border-radius);
  box-shadow: var(--dm-shadow-lg);
}
.responsive-video-embed iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

/* Card Visual System */
.dm-video-card {
  background-color: var(--dm-surface);
  border: 1px solid var(--dm-border);
  border-radius: var(--dm-border-radius);
  overflow: hidden;
  transition: var(--dm-transition);
}
.dm-video-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--dm-shadow-lg);
}
.card-thumbnail { position: relative; }
.play-overlay {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  background: rgba(10, 60, 47, 0.8);
  border-radius: 50%;
  width: 48px; height: 48px;
  display: flex; align-items: center; justify-content: center;
  opacity: 0; transition: var(--dm-transition);
}
.dm-video-card:hover .play-overlay { opacity: 1; }
.video-duration {
  position: absolute;
  bottom: 8px; right: 8px;
  background: rgba(0,0,0,0.8);
  color: #FFF; font-size: 0.75rem;
  padding: 2px 6px; border-radius: 4px;
}

/* Buttons System */
.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.75rem 1.5rem; border-radius: 6px; font-weight: 600;
  cursor: pointer; border: none; transition: var(--dm-transition);
}
.btn-gold { background-color: var(--dm-gold); color: var(--dm-charcoal); }
.btn-gold:hover { background-color: var(--dm-gold-hover); color: #FFF; }

/* Layout Architecture */
.layout-with-sidebar {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}
@media (min-width: 992px) {
  .layout-with-sidebar { grid-template-columns: 2fr 1fr; }
}

/* Dark Mode Button Styling */
.utility-btn {
  background: transparent; border: none; font-size: 1.25rem; cursor: pointer;
}
[data-theme="dark"] .dark-icon { display: none; }
[data-theme="light"] .light-icon { display: none; }