/* Sparks Catalog Page Styles — v30
   F-1: Hero Section / First Impression — 2026-03-23
   F-2: Card Thumbnails — 2026-03-23
   F-3: Card Polish — Style D Full Premium — 2026-03-24
   F-4: Page Background Gradient + Category Borders + Glow — 2026-03-24
   F-13: Tag capping (4 visible + "+N" badge) — 2026-03-26
   F-16: Hero Section Elevation — Option D (bold type + radial glow) — 2026-03-26

   ⚠️ MINIMUM FONT SIZE: 12px (0.75rem). No font-size below this value.
   This ensures readability on mobile and meets accessibility guidelines. */

:root {
  --sparks-bg: #080e10;
  --sparks-card-bg: rgba(11, 21, 53, 0.7);
  --sparks-card-hover: rgba(16, 28, 60, 0.8);
  --sparks-accent: #1ebbf0;
  --sparks-accent2: #39dfaa;
  --sparks-text: #ededf0;
  --sparks-text-muted: #bcc0ca;
  --sparks-tag-bg: rgba(30, 187, 240, 0.15);
  --sparks-tag-text: #5dd4f5;
  --sparks-border: rgba(255, 255, 255, 0.08);
}

/* ═══════════════════════════════════════════════════════════════════
   BASE CONTAINER
   ═══════════════════════════════════════════════════════════════════ */
.sparks-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px 1rem 2rem;
  font-family: 'Sora', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  color: var(--sparks-text);
  position: relative;
}

.sparks-icon-btn {
  background: none;
  border: 1px solid var(--sparks-border);
  border-radius: 50%;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--sparks-text-muted);
  transition: all 0.2s;
  flex-shrink: 0;
}
.sparks-icon-btn:hover,
.sparks-icon-btn.active {
  border-color: var(--sparks-accent);
  color: var(--sparks-accent);
  background: rgba(30, 187, 240, 0.08);
}
.sparks-icon-btn svg {
  width: 14px;
  height: 14px;
  stroke: currentColor;
  stroke-width: 2;
  fill: none;
  pointer-events: none;
}

/* ═══════════════════════════════════════════════════════════════════
   HERO SECTION (F-1 + F-16: Option D — Brand + tagline lockup
   with radial glow)
   ═══════════════════════════════════════════════════════════════════ */
.sparks-hero {
  margin: 0 0 1.5rem;
  padding: 0.5rem 0 1.25rem;
  position: relative;
}

/* Subtle radial glow behind hero — gives depth without clutter */
.sparks-hero::before {
  content: '';
  position: absolute;
  top: -20px;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 280px;
  background: radial-gradient(
    ellipse at center,
    rgba(30, 187, 240, 0.08) 0%,
    rgba(57, 223, 170, 0.04) 40%,
    transparent 70%
  );
  pointer-events: none;
  z-index: -1;
}

/* Brand name — big, responsive, gradient — the headline of the lockup */
.sparks-hero-brand {
  font-size: clamp(36px, 6vw, 56px);
  font-weight: 700;
  line-height: 1.1;
  margin: 0 0 0.15em 0;
  background: linear-gradient(135deg, var(--sparks-accent), var(--sparks-accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.02em;
}

/* Tagline — sits tight below the brand, smaller but still confident */
.sparks-hero-tagline {
  font-size: clamp(15px, 2vw, 20px);
  font-weight: 500;
  line-height: 1.3;
  margin-bottom: 0.5rem;
  color: var(--sparks-text);
  letter-spacing: 0;
}

.sparks-hero-subtitle {
  font-size: 0.95rem;
  color: #bcc0ca;
  line-height: 1.6;
  margin-bottom: 0.85rem;
}

/* Stats row — stats on left, search icon on right, single line */
.sparks-hero-stats-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 0.6rem;
  border-top: 1px solid rgba(30, 187, 240, 0.1);
}

.sparks-hero-stats {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  flex: 1;
  min-width: 0;
}

.sparks-hero-stat {
  font-size: 0.75rem;
  color: var(--sparks-text-muted);
  display: flex;
  align-items: center;
  gap: 0.3rem;
  white-space: nowrap;
}

.sparks-hero-stat-icon {
  font-size: 0.85rem;
}

.sparks-hero-stat-sep {
  color: rgba(136, 146, 164, 0.35);
  font-size: 0.75rem;
  user-select: none;
}

/* Tablet hero adjustments */
@media (max-width: 900px) {
  .sparks-hero {
    padding: 0.25rem 0 1rem;
  }
  .sparks-hero::before {
    width: 400px;
    height: 220px;
  }
}

/* Mobile hero adjustments */
@media (max-width: 600px) {
  .sparks-hero {
    margin: 0 0 1rem;
    padding: 0.25rem 0 0.75rem;
  }
  .sparks-hero-brand {
    font-size: clamp(32px, 9vw, 44px);
    margin-bottom: 0.1em;
  }
  .sparks-hero-tagline {
    font-size: clamp(14px, 3.8vw, 17px);
    margin-bottom: 0.4rem;
  }
  .sparks-hero-subtitle {
    font-size: 0.88rem;
    margin-bottom: 0.6rem;
    line-height: 1.5;
  }
  .sparks-hero-stats-row {
    padding-top: 0.5rem;
  }
  .sparks-hero-stats {
    gap: 0.5rem;
  }
  .sparks-hero::before {
    width: 300px;
    height: 200px;
    top: -15px;
  }
}

/* ═══════════════════════════════════════════════════════════════════
   CATEGORY PILLS
   
   Behavior by breakpoint:
   - Desktop ≥901px: flex-wrap — pills wrap to multiple rows
   - Tablet/mobile ≤900px: horizontal scroll with scroll affordance
   ═══════════════════════════════════════════════════════════════════ */
.sparks-categories {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 1rem;
  position: relative;
}

.sparks-cat-pill {
  padding: 5px 14px;
  border-radius: 100px;
  border: 1px solid var(--sparks-border);
  background: transparent;
  color: var(--sparks-text-muted);
  font-size: 0.75rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
  font-family: inherit;
  line-height: 1.2;
}
.sparks-cat-pill:hover {
  border-color: rgba(30, 187, 240, 0.4);
  color: var(--sparks-text);
}
.sparks-cat-pill.active {
  border-color: var(--sparks-accent);
  background: rgba(30, 187, 240, 0.12);
  color: var(--sparks-accent);
}

/* Horizontal scroll for pills on tablet and mobile (≤900px). */
@media (max-width: 900px) {
  .sparks-categories {
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    -ms-overflow-style: none;
    padding-bottom: 4px;
    /* Fade hint on right edge to indicate scrollability */
    mask-image: linear-gradient(to right, black calc(100% - 40px), transparent 100%);
    -webkit-mask-image: linear-gradient(to right, black calc(100% - 40px), transparent 100%);
  }
  .sparks-categories::-webkit-scrollbar {
    display: none;
  }
  /* Remove fade once user has scrolled to the end */
  .sparks-categories.scrolled-end {
    mask-image: none;
    -webkit-mask-image: none;
  }
}

/* Drag-to-scroll cursor for category pills on desktop */
.sparks-categories {
  cursor: grab;
}
.sparks-categories.is-dragging {
  cursor: grabbing;
  user-select: none;
}

/* ═══════════════════════════════════════════════════════════════════
   EXPANDABLE SEARCH BAR
   ═══════════════════════════════════════════════════════════════════ */
.sparks-search-row {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, margin 0.3s ease, opacity 0.25s ease;
  opacity: 0;
  margin-bottom: 0;
}
.sparks-search-row.open {
  max-height: 60px;
  opacity: 1;
  margin-bottom: 1rem;
}
.sparks-search-row input {
  width: 100%;
  padding: 0.6rem 1rem;
  font-size: 0.9rem;
  border-radius: 8px;
  border: 1px solid var(--sparks-border);
  background: var(--sparks-card-bg);
  color: var(--sparks-text);
  outline: none;
  transition: border-color 0.2s;
  font-family: inherit;
  box-sizing: border-box;
}
.sparks-search-row input:focus {
  border-color: var(--sparks-accent);
}
.sparks-search-row input::placeholder {
  color: var(--sparks-text-muted);
}

/* ═══════════════════════════════════════════════════════════════════
   CARD GRID — 3 → 2 → 1 columns
   ═══════════════════════════════════════════════════════════════════ */
.sparks-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

/* 2 columns: 601–900px */
@media (max-width: 900px) {
  .sparks-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* 1 column: ≤600px */
@media (max-width: 600px) {
  .sparks-grid {
    grid-template-columns: 1fr;
  }
  .sparks-brand h2 {
    font-size: 1.25rem;
  }
  .sparks-cat-pill {
    padding: 6px 14px;
    font-size: 0.78rem;
  }
}

/* ═══════════════════════════════════════════════════════════════════
   CARDS — Style D: Full Premium Glassmorphism
   ═══════════════════════════════════════════════════════════════════ */
.sparks-card {
  --card-accent: 30, 187, 240; /* default cyan, overridden per category by JS */
  background: rgba(11, 21, 53, 0.7);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 16px;
  padding: 0;
  text-decoration: none;
  color: var(--sparks-text);
  display: flex;
  flex-direction: column;
  transition: all 0.3s ease;
  cursor: pointer !important;
  overflow: hidden;
  position: relative;
  box-shadow: 0 4px 16px rgba(0,0,0,0.2), 0 1px 3px rgba(0,0,0,0.1);
}

/* Gradient accent bar — hidden at rest, visible on hover */
.sparks-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, #1ebbf0, #39dfaa);
  opacity: 0;
  transition: opacity 0.3s;
  z-index: 3;
}
.sparks-card:hover::before {
  opacity: 1;
}

.sparks-card:hover {
  transform: translateY(-5px);
  box-shadow:
    0 20px 60px rgba(0, 0, 0, 0.4),
    0 8px 24px rgba(0, 0, 0, 0.2),
    0 0 40px rgba(30, 187, 240, 0.1);
  border-color: rgba(30, 187, 240, 0.25);
  background: rgba(16, 28, 60, 0.8);
}

/* ═══════════════════════════════════════════════════════════════════
   CATEGORY-COLORED GRADIENT BORDERS (F-4: Enhancement 2)
   
   Each category gets its own accent bar gradient on hover.
   Uses data-cat attribute set by JS on each .sparks-card.
   ═══════════════════════════════════════════════════════════════════ */
.sparks-card[data-cat="sports"]::before { background: linear-gradient(90deg, #39dfaa, #1ebbf0); }
.sparks-card[data-cat="ai-future"]::before { background: linear-gradient(90deg, #6c63ff, #e94560); }
.sparks-card[data-cat="science-health"]::before { background: linear-gradient(90deg, #1ebbf0, #39dfaa); }
.sparks-card[data-cat="science"]::before { background: linear-gradient(90deg, #1ebbf0, #6c63ff); }
.sparks-card[data-cat="literature-fiction"]::before { background: linear-gradient(90deg, #f0a030, #e94560); }
.sparks-card[data-cat="literature-science"]::before { background: linear-gradient(90deg, #f0a030, #1ebbf0); }
.sparks-card[data-cat="history-geopolitics"]::before { background: linear-gradient(90deg, #e94560, #f0a030); }
.sparks-card[data-cat="culture-media"]::before { background: linear-gradient(90deg, #f5c518, #e94560); }
.sparks-card[data-cat="politics-society"]::before { background: linear-gradient(90deg, #8b5cf6, #6c63ff); }

/* ═══════════════════════════════════════════════════════════════════
   ANIMATED GLOW ON HOVER (F-4: Enhancement 3)
   
   Subtle pulsing ambient glow around the card on hover.
   Uses --glow-color CSS custom property set per category via JS.
   ═══════════════════════════════════════════════════════════════════ */
.sparks-card {
  --glow-color: 30, 187, 240; /* default cyan */
}

.sparks-card-glow {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: 17px;
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
  z-index: -1;
}

.sparks-card:hover .sparks-card-glow {
  opacity: 1;
  animation: card-glow 2s ease-in-out infinite;
}

@keyframes card-glow {
  0%, 100% { box-shadow: 0 0 20px rgba(var(--glow-color), 0.15); }
  50% { box-shadow: 0 0 35px rgba(var(--glow-color), 0.25), 0 0 60px rgba(var(--glow-color), 0.1); }
}

/* Respect prefers-reduced-motion */
@media (prefers-reduced-motion: reduce) {
  .sparks-card:hover .sparks-card-glow {
    animation: none;
    box-shadow: 0 0 25px rgba(var(--glow-color), 0.2);
  }
}

/* ═══════════════════════════════════════════════════════════════════
   CARD THUMBNAILS (F-2)
   ═══════════════════════════════════════════════════════════════════ */
.sparks-card-thumb {
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-radius: 15px 15px 0 0;
  position: relative;
  flex-shrink: 0;
}

/* Thumbnail overlay gradient — smooth transition from image to card body */
.sparks-card-thumb::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 50%;
  background: linear-gradient(to top, rgba(11, 21, 53, 0.8) 0%, transparent 100%);
  pointer-events: none;
}

.sparks-card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
  display: block;
}

.sparks-card:hover .sparks-card-thumb img {
  transform: scale(1.05);
}

/* Fallback gradient placeholder when no thumbnail */
.sparks-card-thumb-fallback {
  display: flex;
  align-items: center;
  justify-content: center;
}

.sparks-card-thumb-icon {
  font-size: 3rem;
  opacity: 0.6;
  filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.3));
}

/* Category-specific fallback gradients */
.sparks-card-thumb-fallback[data-category="Sports"] {
  background: linear-gradient(135deg, #0d9488, #059669, #10b981);
}
.sparks-card-thumb-fallback[data-category="AI & Future"] {
  background: linear-gradient(135deg, #6366f1, #8b5cf6, #a78bfa);
}
.sparks-card-thumb-fallback[data-category="Science & Health"],
.sparks-card-thumb-fallback[data-category="Science"] {
  background: linear-gradient(135deg, #0891b2, #0284c7, #38bdf8);
}
.sparks-card-thumb-fallback[data-category="Literature & Fiction"],
.sparks-card-thumb-fallback[data-category="Literature & Science"] {
  background: linear-gradient(135deg, #d97706, #ea580c, #f59e0b);
}
.sparks-card-thumb-fallback[data-category="History & Geopolitics"] {
  background: linear-gradient(135deg, #dc2626, #b91c1c, #ef4444);
}
.sparks-card-thumb-fallback[data-category="Culture & Media"] {
  background: linear-gradient(135deg, #d97706, #ca8a04, #fbbf24);
}
.sparks-card-thumb-fallback[data-category="Politics & Society"] {
  background: linear-gradient(135deg, #475569, #4f46e5, #6366f1);
}

/* Card body — the text content area below the thumbnail */
.sparks-card-body {
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.sparks-card-category {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--sparks-accent);
  margin-bottom: 0.5rem;
}
.sparks-card-title {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  line-height: 1.3;
}
.sparks-card-desc {
  font-size: 0.9rem;
  color: #dcdde2;
  line-height: 1.5;
  flex: 1;
  margin-bottom: 1rem;
}
.sparks-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 0.5rem;
}
.sparks-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}
.sparks-tag {
  font-size: 0.75rem;
  padding: 0.2rem 0.5rem;
  border-radius: 99px;
  background: rgba(30, 187, 240, 0.12);
  border: 1px solid rgba(30, 187, 240, 0.25);
  color: #5dd4f5;
  white-space: nowrap;
}
.sparks-tag-more {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.12);
  color: var(--sparks-text-muted);
  font-weight: 500;
}
.sparks-card-date {
  font-size: 0.75rem;
  color: #bcc0ca;
  white-space: nowrap;
}

/* ═══════════════════════════════════════════════════════════════════
   METADATA ROW (F-3: Card Polish)
   ═══════════════════════════════════════════════════════════════════ */
.sparks-card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.75rem;
  color: #bcc0ca;
  margin-bottom: 0.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}
.sparks-card-meta span {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* ═══════════════════════════════════════════════════════════════════
   NEW BADGE (F-3: Card Polish)
   ═══════════════════════════════════════════════════════════════════ */
.sparks-badge-new {
  position: absolute;
  top: 12px;
  right: 12px;
  background: #e94560;
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 100px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  z-index: 2;
  box-shadow: 0 2px 8px rgba(233, 69, 96, 0.4);
}

/* ═══════════════════════════════════════════════════════════════════
   EMPTY & LOADING STATES
   ═══════════════════════════════════════════════════════════════════ */
.sparks-empty {
  grid-column: 1 / -1;
  text-align: center;
  padding: 3rem 1rem;
  color: var(--sparks-text-muted);
}
.sparks-empty-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
  opacity: 0.4;
}
.sparks-loading {
  text-align: center;
  padding: 3rem;
  color: var(--sparks-text-muted);
}

/* ═══════════════════════════════════════════════════════════════════
   MOBILE-SPECIFIC OVERRIDES (≤600px)
   ═══════════════════════════════════════════════════════════════════ */
@media (max-width: 600px) {
  .sparks-icon-btn {
    width: 44px !important;
    height: 44px !important;
  }
  .sparks-icon-btn svg {
    width: 16px;
    height: 16px;
  }
  /* Tag capping handled in JS (max 4 visible + "+N" badge) — no CSS overflow needed */
  .sparks-card-body {
    padding: 1rem 1.15rem 1.15rem;
  }
  .sparks-card-title {
    font-size: 1.1rem;
  }
  .sparks-card-desc {
    font-size: 0.85rem;
    color: #dcdde2;
    margin-bottom: 0.75rem;
  }
}

/* ═══════════════════════════════════════════════════════════════════
   SITE FOOTER
   ═══════════════════════════════════════════════════════════════════ */
.site-footer {
  margin-top: 4rem;
  padding: 1.5rem 1rem;
  border-top: 1px solid rgba(30, 187, 240, 0.15);
}

.site-footer-inner {
  max-width: 1200px;
  margin: 0 auto;
}

.site-footer-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.site-footer-row + .site-footer-row {
  margin-top: 0.5rem;
}

.site-footer-brand {
  font-size: 0.9rem;
  font-weight: 600;
  color: #ededf0;
}

.site-footer-nav a {
  font-size: 0.8rem;
  color: #bcc0ca;
  text-decoration: none;
  transition: color 0.2s;
}

.site-footer-nav a:hover {
  color: #1ebbf0;
}

.site-footer-sep {
  color: rgba(188, 192, 202, 0.35);
  font-size: 0.8rem;
  margin: 0 0.25rem;
  user-select: none;
}

.site-footer-attribution {
  font-size: 0.75rem;
  color: #bcc0ca;
}

.site-footer-attribution a {
  color: #1ebbf0;
  text-decoration: none;
}

.site-footer-attribution a:hover {
  text-decoration: underline;
}

.site-footer-copyright {
  font-size: 0.75rem;
  color: rgba(188, 192, 202, 0.6);
}

@media (max-width: 600px) {
  .site-footer-row {
    flex-direction: column;
    text-align: center;
    gap: 0.25rem;
  }
}