/* =========================
   Root Variables
========================= */
:root {
  --primary-brand-color: #1E483A;
  --primary-brand-hover: #153328;
  --section-bg: #F8F9FA;
  --card-bg: #FFFFFF;
  --card-border-color: #EAECEF;
  --text-primary: #2C3E50;
  --text-secondary: #e6e6e6;
  --border-radius-md: 12px;
  --border-radius-sm: 8px;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 15px rgba(0,0,0,0.08);
}

/* =========================
   Global Styles
========================= */
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--section-bg);
  color: var(--text-primary);
  margin: 0;
  width: 100%;
  overflow-x: hidden;
  box-sizing: border-box;
}

/* =========================
   Category Hero
========================= */
.category-hero {
  padding: 80px 0;
  background: #2C3e50 center/cover no-repeat;
  position: relative;
  text-align: center;
}
.category-hero::before {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(0deg, rgba(30,72,58,.85), rgba(44,62,80,.75));
}
.category-hero .container { position: relative; z-index: 2; }

#category-title {
  font-size: 48px; font-weight: 700; color: #fff;
  margin-bottom: 15px;
  text-shadow: 0 2px 8px rgba(0,0,0,.5);
}
#category-title .fa { margin-right: 15px; font-size: .9em; vertical-align: middle; }

#category-description {
  font-size: 18px; color: #eaecef; line-height: 1.7;
  max-width: 700px; margin: 0 auto 30px;
  text-shadow: 0 1px 4px rgba(0,0,0,.6);
}

#category-stats {
  display: inline-block;
  padding: 10px 20px;
  font-size: 14px; font-weight: 600; color: #fff;
  background: rgba(255,255,255,.1);
  backdrop-filter: blur(5px);
  border-radius: 50px;
  border: 1px solid rgba(255,255,255,.3);
}

/* =========================
   Feed Controls
========================= */
.social-feed-section { padding: 80px 0; }

.feed-controls {
  display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center;
  gap: 20px; margin: 0 auto 60px; padding: 15px;
  max-width: 900px;
  background: var(--card-bg);
  border-radius: var(--border-radius-md);
  box-shadow: var(--shadow-md);
}
.feed-controls .back-link {
  font-size: 20px; color: var(--text-secondary);
  text-decoration: none;
}
.feed-controls .back-link:hover { color: var(--primary-brand-color); }

.sort-group select {
  height: 44px; padding: 10px 40px 10px 15px;
  font-weight: 500; color: var(--text-secondary);
  border: 1px solid var(--card-border-color);
  border-radius: var(--border-radius-sm);
  background: var(--section-bg) url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3e%3cpath fill='none' stroke='%23343a40' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M2 5l6 6 6-6'/%3e%3c/svg%3e") no-repeat right .75rem center/16px 12px;
  appearance: none;
  transition: border-color .2s;
}
.sort-group select:focus { outline: none; border-color: var(--primary-brand-color); }

/* =========================
   Social Cards (Grid)
========================= */
.posts-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(280px, 100%), 1fr));
  gap: 20px; padding: 0 15px; margin: 0 auto;
}

.social-card {
  display: flex; flex-direction: column;
  background: var(--card-bg);
  border: 1px solid var(--card-border-color);
  border-radius: var(--border-radius-md);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  transition: .3s ease;
}
.social-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 28px rgba(0,0,0,.12);
  border-color: var(--primary-brand-color);
}

.social-card-iframe,
.social-card iframe {
  width: 100%; border: none; display: block;
}
.social-card-iframe {
  flex-grow: 1;
  aspect-ratio: 1 / 1.5;
  min-height: 300px;
}

.card-actions {
  display: flex; justify-content: space-between; align-items: center;
  padding: 15px; gap: 15px;
  border-top: 1px solid var(--card-border-color);
  background: var(--card-bg);
}
.btn-action {
  flex: 1; padding: 10px 16px;
  font-size: 14px; font-weight: 600;
  border-radius: var(--border-radius-sm);
  border: 1px solid transparent;
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  text-decoration: none; cursor: pointer;
  transition: .25s;
}
.btn-action .fa { font-size: 1.1em; }
.btn-profile {
  background: var(--primary-brand-color); color: #fff;
  box-shadow: 0 4px 12px rgba(30,72,58,.2);
}
.btn-profile:hover {
  background: var(--primary-brand-hover);
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 6px 16px rgba(30,72,58,.3);
}
.btn-post {
  background: #2f997b; 
  color: var(--text-secondary);
  border: 1px solid var(--card-border-color);
}
.btn-post:hover {
  background: var(--section-bg); color: var(--text-primary);
  border-color: #d1d9e0;
  transform: translateY(-2px);
}

/* =========================
   Pagination
========================= */
.pagination-container { text-align: center; margin-top: 60px; }

.pagination {
  display: inline-flex; flex-wrap: wrap; justify-content: center;
  list-style: none; gap: 8px; padding: 0; margin: 0;
}
.pagination li a {
  display: flex; align-items: center; justify-content: center;
  width: 42px; height: 42px;
  font-weight: 600;
  background: var(--card-bg);
  border: 1px solid var(--card-border-color);
  border-radius: var(--border-radius-sm);
  transition: .2s;
  text-decoration: none;
}
.pagination li a:hover {
  background: #e9ecef; color: var(--primary-brand-color); border-color: #d1d9e0;
  transform: translateY(-2px);
}
.pagination li.active a {
  background: var(--primary-brand-color); color: #fff;
  border-color: var(--primary-brand-color);
  box-shadow: 0 4px 10px rgba(30,72,58,.4);
  font-weight: 700;
  transform: translateY(-2px);
}
.pagination li.disabled a {
  background: #f8f9fa; color: #ccc; pointer-events: none;
}

/* =========================
   Empty State
========================= */
#no-results {
  display: none; max-width: 600px; margin: auto;
  padding: 60px 20px;
  background: var(--card-bg);
  border-radius: var(--border-radius-md);
  text-align: center;
}
#no-results .fa { font-size: 40px; color: var(--primary-brand-color); opacity: .6; margin-bottom: 20px; }
#no-results h4 { font-size: 22px; font-weight: 600; }
#no-results p { font-size: 16px; color: var(--text-secondary); max-width: 400px; margin: 10px auto 0; }

/* =========================
   Skeleton Loading
========================= */
.skeleton-wrapper { width: 100%; }
.social-card.skeleton {
  height: 100%; min-height: 300px;
  border-radius: var(--border-radius-md);
  background: linear-gradient(90deg,#f0f0f0 25%,#e0e0e0 50%,#f0f0f0 75%);
  background-size: 200% 100%;
  animation: skeleton-shine 1.5s linear infinite;
}
@keyframes skeleton-shine {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}
.posts-container.loading .skeleton-wrapper { display: grid !important; }
.posts-container:not(.loading) .skeleton-wrapper { display: none; }

/* =========================
   Filters & Search
========================= */
.filter-controls { max-width: 700px; margin: 0 auto 50px; text-align: center; }
.filter-buttons { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; margin-bottom: 25px; }

.filter-btn {
  padding: 10px 24px; font-size: 15px; font-weight: 500;
  border: 1px solid var(--border-color);
  border-radius: 50px;
  background: var(--card-bg); color: #4A5568;
  cursor: pointer; transition: .25s; user-select: none;
}
.filter-btn:hover { border-color: var(--accent-color); color: var(--accent-color); transform: translateY(-2px); }
.filter-btn.active {
  background: var(--accent-color); border-color: var(--accent-color); color: #103527;
  box-shadow: 0 5px 15px rgba(30,72,58,.3);
  transform: translateY(-2px);
}

.search-container { position: relative; }
#category-search-input {
  width: 100%; height: 55px; padding: 10px 25px 10px 55px;
  font-size: 16px;
  border: 1px solid var(--border-color);
  border-radius: 50px;
  box-shadow: 0 4px 20px rgba(0,0,0,.05);
  transition: .3s;
}
#category-search-input:focus {
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px rgba(30,72,58,.2);
  outline: none;
}
.search-container .fa-search {
  position: absolute; left: 22px; top: 50%;
  transform: translateY(-50%);
  color: #A0AEC0; font-size: 16px;
}

/* =========================
   Animations
========================= */
@keyframes cascadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}
.header-animation .title-base > *,
.feed-section .text-center > *,
.filter-controls {
  opacity: 0;
  animation: cascadeIn .6s cubic-bezier(.34,1.56,.64,1) forwards;
}
.header-animation .title-base h1 { animation-delay: .1s; }
.header-animation .title-base p { animation-delay: .2s; }
.header-animation .title-base hr.anima { animation-delay: .3s; }
.feed-section .text-center h3 { animation-delay: .1s; }
.feed-section .text-center h5 { animation-delay: .2s; }
.filter-controls { animation-delay: .35s; }

/* =========================
   Responsive
========================= */
@media (max-width: 767px) {
  .social-feed-section { padding: 30px 10px; }
  .category-hero { padding: 40px 10px; }
  #category-title { font-size: 28px; }
  #category-description { font-size: 14px; max-width: 90%; }

  .feed-controls { flex-direction: column; align-items: stretch; gap: 10px; padding: 10px; }
  .feed-controls h4 { font-size: 18px; text-align: center; }
  .sort-group { width: 100%; }
  .sort-group select { width: 100%; padding: 8px 12px; }

  .posts-container { grid-template-columns: 1fr; gap: 15px; padding: 0 10px; }
  .social-card-iframe, .social-card.skeleton { min-height: 280px; aspect-ratio: 1 / 1.6; }

  .card-actions { flex-direction: column; gap: 10px; padding: 10px; }
  .btn-action { width: 100%; padding: 8px; }

  .pagination-container { margin-top: 40px; }
  .pagination { gap: 5px; }
  .pagination li a { width: 38px; height: 38px; font-size: 14px; }
}

@media (max-width: 400px) {
  .posts-container { gap: 10px; padding: 0 5px; }
  .social-card-iframe, .social-card.skeleton { min-height: 250px; aspect-ratio: 1 / 1.8; }
  #category-title { font-size: 24px; }
  #category-description { font-size: 13px; }
}