/* ====================================
   Whale Analyzer — Academy Hub Styles
   Investment Knowledge Hub main page
   MDLDM-inspired premium polish
   ==================================== */

/* ── Category Colors ── */
:root {
  --cat-experience: #FF6B35;
  --cat-philosophy: #7C3AED;
  --cat-tools: #059669;
  --cat-fundamentals: #2563EB;
  --cat-experience-dim: rgba(255, 107, 53, 0.10);
  --cat-philosophy-dim: rgba(124, 58, 237, 0.10);
  --cat-tools-dim: rgba(5, 150, 105, 0.10);
  --cat-fundamentals-dim: rgba(37, 99, 235, 0.10);
}

/* ── Academy Hero ── */
.academy-hero {
  text-align: center;
  padding: 56px 0 40px;
  position: relative;
}

.academy-hero::before {
  content: '';
  position: absolute;
  top: -80px;
  left: 50%;
  transform: translateX(-50%);
  width: 560px;
  height: 560px;
  background: radial-gradient(circle, var(--accent-dim) 0%, transparent 65%);
  pointer-events: none;
  z-index: 0;
  animation: heroGlow 4s ease-in-out infinite alternate;
}

@keyframes heroGlow {
  from { opacity: 0.6; transform: translateX(-50%) scale(0.95); }
  to { opacity: 1; transform: translateX(-50%) scale(1.05); }
}

.academy-hero-icon {
  font-size: 52px;
  margin-bottom: 16px;
  display: block;
  position: relative;
  z-index: 1;
  animation: heroIconBounce 3s ease-in-out infinite;
}

@keyframes heroIconBounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

.academy-hero h1 {
  font-size: clamp(30px, 5vw, 48px);
  font-weight: 900;
  letter-spacing: -1.5px;
  margin-bottom: 10px;
  position: relative;
  z-index: 1;
  background: linear-gradient(135deg, var(--text-primary) 0%, #444 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.academy-hero .subtitle {
  font-size: 15px;
  color: var(--text-secondary);
  max-width: 520px;
  margin: 0 auto 32px;
  line-height: 1.7;
  position: relative;
  z-index: 1;
  letter-spacing: 0.2px;
}

/* ── Search Bar ── */
.academy-search {
  max-width: 500px;
  margin: 0 auto 40px;
  position: relative;
  z-index: 1;
}

.academy-search input {
  width: 100%;
  padding: 14px 22px 14px 48px;
  border: var(--border-width-bold) solid var(--border-bold);
  border-radius: var(--radius-pill);
  background: var(--bg-secondary);
  font-family: var(--font-body);
  font-size: var(--fs-base);
  color: var(--text-primary);
  outline: none;
  transition: all var(--transition-base);
  box-shadow: var(--shadow-card-sm);
}

.academy-search input:focus {
  border-color: var(--accent);
  box-shadow: var(--shadow-card), 0 0 0 4px var(--accent-dim);
  transform: translateY(-1px);
}

.academy-search input::placeholder {
  color: var(--text-muted);
  font-weight: var(--fw-medium);
}

.academy-search-icon {
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
  font-size: 16px;
  transition: color var(--transition-fast);
}

.academy-search input:focus ~ .academy-search-icon,
.academy-search:focus-within .academy-search-icon {
  color: var(--accent-dark);
}

/* ── Category Tabs ── */
.academy-tabs {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 40px;
  position: relative;
  z-index: 1;
}

.academy-tab {
  padding: 9px 20px;
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--radius-pill);
  background: var(--bg-secondary);
  font-family: var(--font-body);
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
  letter-spacing: 0.3px;
  position: relative;
  overflow: hidden;
}

.academy-tab::after {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--accent);
  opacity: 0;
  transition: opacity var(--transition-fast);
  z-index: -1;
}

.academy-tab:hover {
  border-color: var(--border-bold);
  color: var(--text-primary);
  transform: translateY(-2px);
  box-shadow: 2px 2px 0 var(--border-bold);
}

.academy-tab.active {
  border-color: var(--border-bold);
  background: var(--text-primary);
  color: var(--bg-primary);
  box-shadow: var(--shadow-btn);
  font-weight: var(--fw-bold);
}

.academy-tab.active:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-btn-hover);
}

/* ── Card Grid ── */
.academy-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-bottom: 60px;
}

/* ── Article Card (mdldm style) ── */
.academy-card {
  background: var(--bg-card);
  border: var(--border-width-bold) solid var(--border-bold);
  border-radius: var(--radius-lg);
  overflow: hidden;
  cursor: pointer;
  transition: all var(--transition-base);
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  position: relative;
}

.academy-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(135deg, transparent 60%, var(--accent-dim) 100%);
  opacity: 0;
  transition: opacity var(--transition-base);
  z-index: 0;
  pointer-events: none;
}

.academy-card:hover {
  transform: translate(-4px, -4px);
  box-shadow: var(--shadow-card-hover);
}

.academy-card:hover::before {
  opacity: 1;
}

.academy-card .card-cover {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--bg-tertiary);
}

.academy-card .card-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
  will-change: transform;
}

.academy-card:hover .card-cover img {
  transform: scale(1.06);
}

.academy-card .card-cover-overlay {
  position: absolute;
  inset: 0;
  mix-blend-mode: multiply;
  transition: opacity var(--transition-base);
  opacity: 0.5;
}

.academy-card:hover .card-cover-overlay {
  opacity: 0.3;
}

/* ── Cover Inner (emoji icon for related cards) ── */
.academy-card .card-cover-inner {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 48px;
  z-index: 1;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.1));
  transition: transform var(--transition-base);
}

.academy-card:hover .card-cover-inner {
  transform: translate(-50%, -50%) scale(1.12);
}

/* ── Featured Badge ── */
.card-featured-badge {
  position: absolute;
  top: 12px;
  right: 12px;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  font-size: 10px;
  font-weight: var(--fw-bold);
  background: var(--accent);
  color: var(--accent-text);
  border: 2px solid var(--border-bold);
  box-shadow: 2px 2px 0 var(--border-bold);
  letter-spacing: 0.5px;
  z-index: 2;
  text-transform: uppercase;
}

/* ── Reading Time Visual Dots ── */
.card-time-visual {
  display: flex;
  align-items: center;
  gap: 8px;
}

.time-dots {
  display: flex;
  gap: 3px;
}

.time-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--border-color);
  transition: background var(--transition-fast);
}

.time-dot.active {
  background: var(--accent-dark);
}

.academy-card .card-category-badge {
  position: absolute;
  top: 12px;
  left: 12px;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  font-size: var(--fs-2xs);
  font-weight: var(--fw-bold);
  letter-spacing: 0.5px;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 2;
}

.card-category-badge[data-cat="experience"] {
  background: var(--cat-experience-dim);
  color: var(--cat-experience);
  border: 1.5px solid rgba(255, 107, 53, 0.25);
}
.card-category-badge[data-cat="philosophy"] {
  background: var(--cat-philosophy-dim);
  color: var(--cat-philosophy);
  border: 1.5px solid rgba(124, 58, 237, 0.25);
}
.card-category-badge[data-cat="tools"] {
  background: var(--cat-tools-dim);
  color: var(--cat-tools);
  border: 1.5px solid rgba(5, 150, 105, 0.25);
}
.card-category-badge[data-cat="fundamentals"] {
  background: var(--cat-fundamentals-dim);
  color: var(--cat-fundamentals);
  border: 1.5px solid rgba(37, 99, 235, 0.25);
}

.academy-card .card-body {
  padding: 20px 22px 18px;
  flex: 1;
  display: flex;
  flex-direction: column;
  position: relative;
  z-index: 1;
}

.academy-card .card-title {
  font-size: var(--fs-md);
  font-weight: var(--fw-bold);
  line-height: var(--lh-tight);
  margin-bottom: 8px;
  color: var(--text-primary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  transition: color var(--transition-fast);
}

.academy-card:hover .card-title {
  color: var(--accent-dark);
}

.academy-card .card-excerpt {
  font-size: var(--fs-sm);
  color: var(--text-secondary);
  line-height: var(--lh-relaxed);
  margin-bottom: 16px;
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ── Card Footer (new — clean separator + meta) ── */
.academy-card .card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  border-top: 1.5px solid var(--border-color);
  margin-top: auto;
}

.academy-card .card-meta-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}

.academy-card .card-reading-time {
  font-family: var(--font-mono);
  font-size: var(--fs-2xs);
  color: var(--text-tertiary);
  display: flex;
  align-items: center;
  gap: 4px;
}

.academy-card .card-date {
  font-size: var(--fs-2xs);
  color: var(--text-muted);
}

.academy-card .card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.academy-card .card-tag {
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  font-size: 10px;
  font-weight: var(--fw-semibold);
  background: var(--bg-tertiary);
  color: var(--text-tertiary);
  border: 1px solid var(--border-color);
  transition: all var(--transition-fast);
  letter-spacing: 0.2px;
}

.academy-card:hover .card-tag {
  background: var(--accent-dim);
  color: var(--accent-dark);
  border-color: rgba(255, 214, 0, 0.2);
}

/* ── Difficulty Badge ── */
.difficulty-badge {
  font-size: 10px;
  font-weight: var(--fw-bold);
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  letter-spacing: 0.3px;
  text-transform: uppercase;
}
.difficulty-badge.beginner {
  background: rgba(34, 197, 94, 0.10);
  color: var(--color-green);
  border: 1px solid rgba(34, 197, 94, 0.15);
}
.difficulty-badge.intermediate {
  background: rgba(59, 130, 246, 0.10);
  color: var(--color-blue);
  border: 1px solid rgba(59, 130, 246, 0.15);
}
.difficulty-badge.advanced {
  background: rgba(249, 115, 22, 0.10);
  color: var(--color-orange);
  border: 1px solid rgba(249, 115, 22, 0.15);
}

/* ── Featured Section ── */
.academy-featured-section {
  margin-bottom: 48px;
}

.academy-section-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--border-color);
}

.academy-section-header h2 {
  font-size: var(--fs-xl);
  font-weight: var(--fw-extrabold);
  letter-spacing: -0.5px;
}

.academy-section-header .section-icon {
  font-size: 22px;
}

/* ── No Results ── */
.academy-no-results {
  grid-column: 1 / -1;
  text-align: center;
  padding: 80px 24px;
  color: var(--text-muted);
}

.academy-no-results .no-results-icon {
  font-size: 56px;
  margin-bottom: 16px;
  opacity: 0.6;
}

.academy-no-results p {
  font-size: var(--fs-sm);
  max-width: 360px;
  margin: 0 auto;
}

/* ── Result Count ── */
.academy-result-count {
  text-align: center;
  font-size: var(--fs-xs);
  color: var(--text-muted);
  margin-bottom: 20px;
  font-family: var(--font-mono);
  letter-spacing: 0.5px;
}

/* ── Article Count Pill (hub footer) ── */
.academy-footer-stats {
  text-align: center;
  padding: 20px 0 0;
  margin-top: 0;
}

.academy-footer-stats .stat-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  background: var(--bg-tertiary);
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-pill);
  font-size: var(--fs-xs);
  font-family: var(--font-mono);
  color: var(--text-tertiary);
  letter-spacing: 0.5px;
}

/* ── Responsive ── */
@media (max-width: 1023px) {
  .academy-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 22px;
  }
}

@media (max-width: 639px) {
  .academy-grid {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .academy-hero {
    padding: 40px 0 28px;
  }

  .academy-hero h1 {
    font-size: 28px;
  }

  .academy-hero .subtitle {
    font-size: 14px;
    padding: 0 16px;
  }

  .academy-tabs {
    justify-content: flex-start;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 4px;
    flex-wrap: nowrap;
    gap: 8px;
    padding-left: 16px;
    padding-right: 16px;
    margin-left: -16px;
    margin-right: -16px;
  }

  .academy-card .card-cover {
    aspect-ratio: 2 / 1;
  }

  .card-featured-badge {
    font-size: 9px;
    padding: 3px 8px;
  }

  .time-dots {
    display: none;
  }

  .academy-search {
    margin: 0 16px 32px;
  }
}