/* ==========================================================================
   SKILL DATABASE - Dark Theme (matching prompt-database)
   ========================================================================== */
:root {
  --primary-color: #4F46E5;
  --secondary-color: #7C3AED;
  --accent-primary: #A78BFA;
  --bg-primary: #0D0C1D;
  --bg-secondary: #1A1A2E;
  --surface-glass: rgba(255, 255, 255, 0.05);
  --surface-glass-hover: rgba(255, 255, 255, 0.08);
  --text-primary: #FFFFFF;
  --text-secondary: #9CA3AF;
  --text-tertiary: #6B7280;
  --text-headings: #E5E7EB;
  --border-glass: rgba(255, 255, 255, 0.1);
  --border-glass-hover: rgba(255, 255, 255, 0.2);
  --card-bg: rgba(255, 255, 255, 0.03);
  --card-bg-hover: rgba(255, 255, 255, 0.06);
  --dropdown-bg: #0D0C1D;
  --accent-color: #06b6d4;
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --danger-color: #ef4444;
  --transition-speed: 0.3s;
  --transition-ease: cubic-bezier(0.4, 0, 0.2, 1);
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html, body { max-width: 100%; overflow-x: hidden; }

body {
  min-height: 100vh;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  line-height: 1.6;
  position: relative;
  isolation: isolate;
}

body::before {
  content: '';
  position: fixed;
  top: -20%; left: -20%;
  width: 60%; height: 60%;
  background: radial-gradient(circle, var(--primary-color) 0%, transparent 70%);
  opacity: 0.12;
  filter: blur(100px);
  z-index: -1;
  pointer-events: none;
}

body::after {
  content: '';
  position: fixed;
  bottom: -20%; right: -20%;
  width: 60%; height: 60%;
  background: radial-gradient(circle, var(--accent-primary) 0%, transparent 70%);
  opacity: 0.12;
  filter: blur(100px);
  z-index: -1;
  pointer-events: none;
}

/* ---- Hero ---- */
.hero {
  text-align: center;
  padding: 6rem 1.5rem 3rem;
  background: linear-gradient(180deg, rgba(79, 70, 229, 0.08) 0%, transparent 100%);
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  background: linear-gradient(135deg, #fff 0%, var(--accent-primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 1rem;
}

.hero-description {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto 1.5rem;
}

.hero-actions-row {
  display: flex;
  justify-content: center;
  gap: 1rem;
}

.btn-hero-action {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  background: var(--primary-color);
  color: #fff;
  border-radius: var(--radius-lg);
  text-decoration: none;
  font-weight: 600;
  transition: all var(--transition-speed);
}

.btn-hero-action:hover {
  background: var(--secondary-color);
  transform: translateY(-2px);
  color: #fff;
}

/* ---- Container ---- */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem 3rem;
}

/* ---- Filters ---- */
.filter-section {
  margin-bottom: 1.5rem;
}

.filter-section h2 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-tertiary);
  margin-bottom: 0.75rem;
  font-weight: 600;
}

.filter-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.button {
  padding: 0.5rem 1rem;
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  background: var(--surface-glass);
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-speed);
  white-space: nowrap;
}

.button:hover {
  background: var(--surface-glass-hover);
  border-color: var(--border-glass-hover);
  color: var(--text-primary);
}

.button.active {
  background: var(--primary-color);
  border-color: var(--primary-color);
  color: #fff;
}

.button-outline {
  background: transparent;
  border-color: var(--primary-color);
  color: var(--primary-color);
}

.button-primary {
  background: var(--primary-color);
  border-color: var(--primary-color);
  color: #fff;
}

.button-primary:hover {
  background: var(--secondary-color);
  border-color: var(--secondary-color);
  color: #fff;
}

/* Difficulty filter badges */
.difficulty-beginner.active { background: #059669; border-color: #059669; }
.difficulty-intermediate.active { background: #d97706; border-color: #d97706; }
.difficulty-advanced.active { background: #dc2626; border-color: #dc2626; }

/* ---- Controls ---- */
.controls-section {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
  padding: 1rem;
  background: var(--surface-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
}

.sort-control, .display-control {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.sort-control label, .display-control label {
  font-size: 0.85rem;
  color: var(--text-tertiary);
  white-space: nowrap;
}

.select-control {
  padding: 0.4rem 0.75rem;
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 0.85rem;
}

.search-form { margin-left: auto; }

.search-input-container {
  display: flex;
  gap: 0.5rem;
}

.search-input {
  padding: 0.5rem 1rem;
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 0.9rem;
  min-width: 220px;
}

.search-input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.2);
}

/* ---- Results Info ---- */
.results-info {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.search-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.25rem 0.75rem;
  background: rgba(79, 70, 229, 0.15);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
}

.search-tag a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 700;
}

/* ---- Skills Grid ---- */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1.25rem;
}

.skill-card {
  background: var(--card-bg);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-xl);
  padding: 1.25rem;
  transition: all var(--transition-speed) var(--transition-ease);
  display: flex;
  flex-direction: column;
}

.skill-card:hover {
  background: var(--card-bg-hover);
  border-color: var(--border-glass-hover);
  transform: translateY(-3px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.skill-card .card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 0.75rem;
}

.badges {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.category-badge {
  padding: 0.2rem 0.6rem;
  background: rgba(79, 70, 229, 0.15);
  color: var(--accent-primary);
  border-radius: var(--radius-sm);
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.difficulty-badge {
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
  font-size: 0.72rem;
  font-weight: 600;
}

.badge-beginner { background: rgba(5, 150, 105, 0.2); color: #34d399; }
.badge-intermediate { background: rgba(217, 119, 6, 0.2); color: #fbbf24; }
.badge-advanced { background: rgba(220, 38, 38, 0.2); color: #f87171; }

.card-actions {
  display: flex;
  gap: 0.5rem;
}

.skill-upvotes {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.icon-button {
  background: none;
  border: none;
  color: var(--text-tertiary);
  cursor: pointer;
  font-size: 0.95rem;
  padding: 0.25rem;
  transition: all var(--transition-speed);
}

.icon-button:hover, .icon-button.upvoted {
  color: #ef4444;
}

.upvote-count {
  font-size: 0.8rem;
  color: var(--text-tertiary);
  font-weight: 500;
}

.card-body {
  flex: 1;
  margin-bottom: 0.75rem;
}

.skill-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.4rem;
  line-height: 1.3;
}

.skill-excerpt {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

/* Tags */
.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: 0.75rem;
}

.tag-chip {
  padding: 0.15rem 0.5rem;
  background: var(--surface-glass);
  border: 1px solid var(--border-glass);
  border-radius: 100px;
  font-size: 0.7rem;
  color: var(--text-tertiary);
}

.tag-more {
  background: rgba(79, 70, 229, 0.1);
  color: var(--accent-primary);
  border-color: rgba(79, 70, 229, 0.2);
}

/* Footer of card */
.card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border-glass);
}

.footer-stats {
  display: flex;
  gap: 0.75rem;
}

.stat-item {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.stat-item i { font-size: 0.7rem; }

.platform-badge {
  font-size: 0.7rem;
  color: var(--text-tertiary);
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

/* ---- No Results ---- */
.no-results {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--text-secondary);
}

.no-results i {
  font-size: 3rem;
  margin-bottom: 1rem;
  opacity: 0.4;
}

.no-results h3 {
  font-size: 1.3rem;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

/* ---- Pagination ---- */
.pagination-wrapper {
  display: flex;
  justify-content: center;
  padding: 2rem 0;
}

.pagination {
  display: flex;
  gap: 0.35rem;
  align-items: center;
}

.page-link {
  padding: 0.5rem 0.85rem;
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  background: var(--surface-glass);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.85rem;
  transition: all var(--transition-speed);
}

.page-link:hover {
  background: var(--surface-glass-hover);
  color: var(--text-primary);
}

.page-link.active {
  background: var(--primary-color);
  border-color: var(--primary-color);
  color: #fff;
}

.page-ellipsis {
  padding: 0.5rem 0.35rem;
  color: var(--text-tertiary);
}

/* ---- Responsive ---- */
@media (max-width: 768px) {
  .hero { padding: 4rem 1rem 2rem; }
  .grid { grid-template-columns: 1fr; }
  .controls-section { flex-direction: column; align-items: stretch; }
  .search-form { margin-left: 0; }
  .search-input { min-width: 0; width: 100%; }
  .search-input-container { width: 100%; }
}

@media (max-width: 540px) {
  .filter-buttons { gap: 0.35rem; }
  .button { padding: 0.4rem 0.75rem; font-size: 0.8rem; }
  .footer-stats { gap: 0.5rem; }
}