/* ============================================
   GizmoParty — Design System & Styles
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

/* — Custom Properties — */
:root {
  --bg-primary: #0a0e1a;
  --bg-secondary: #111827;
  --bg-card: rgba(255, 255, 255, 0.04);
  --bg-card-hover: rgba(255, 255, 255, 0.08);
  --border-card: rgba(255, 255, 255, 0.08);
  --border-card-hover: rgba(139, 92, 246, 0.4);

  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  --accent-1: #8b5cf6;
  --accent-2: #6366f1;
  --accent-3: #a78bfa;
  --accent-gradient: linear-gradient(135deg, var(--accent-1), var(--accent-2));

  --glow-color: rgba(139, 92, 246, 0.15);
  --glow-color-strong: rgba(139, 92, 246, 0.3);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;

  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.25);
  --shadow-card-hover: 0 8px 40px rgba(0, 0, 0, 0.35), 0 0 30px var(--glow-color);

  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-medium: 0.35s cubic-bezier(0.4, 0, 0.2, 1);

  --max-width: 1200px;
}

/* — Reset & Base — */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* — Animated Background — */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 600px 400px at 20% 20%, rgba(99, 102, 241, 0.08), transparent),
    radial-gradient(ellipse 500px 350px at 80% 80%, rgba(139, 92, 246, 0.06), transparent),
    radial-gradient(ellipse 400px 300px at 50% 50%, rgba(167, 139, 250, 0.04), transparent);
  pointer-events: none;
  z-index: 0;
}

/* — Layout Container — */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* ============================================
   Header
   ============================================ */
.header {
  padding: 48px 0 32px;
  text-align: center;
}

.header__logo {
  font-size: 3rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 8px;
  line-height: 1.1;
}

.header__logo span {
  -webkit-text-fill-color: var(--text-primary);
}

.header__tagline {
  font-size: 1.1rem;
  color: var(--text-secondary);
  font-weight: 400;
  max-width: 480px;
  margin: 0 auto;
}

/* ============================================
   Controls Bar (Sort / Filter)
   ============================================ */
.controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding: 16px 0 24px;
  border-bottom: 1px solid var(--border-card);
  margin-bottom: 32px;
}

.controls__label {
  font-size: 0.85rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
}

.controls__sort-group {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.sort-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  font-size: 0.85rem;
  font-weight: 500;
  font-family: inherit;
  color: var(--text-secondary);
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
}

.sort-btn:hover {
  color: var(--text-primary);
  background: var(--bg-card-hover);
  border-color: rgba(255, 255, 255, 0.15);
}

.sort-btn.active {
  color: var(--accent-3);
  background: rgba(139, 92, 246, 0.1);
  border-color: rgba(139, 92, 246, 0.3);
}

.sort-btn .arrow {
  font-size: 0.75rem;
  opacity: 0.6;
  transition: transform var(--transition-fast);
}

.sort-btn.active .arrow {
  opacity: 1;
}

.sort-btn.desc .arrow {
  transform: rotate(180deg);
}

.app-count {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* ============================================
   App Grid
   ============================================ */
.app-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 24px;
  padding-bottom: 64px;
}

/* ============================================
   App Card
   ============================================ */
.app-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 28px;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition:
    transform var(--transition-medium),
    background var(--transition-medium),
    border-color var(--transition-medium),
    box-shadow var(--transition-medium);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  overflow: hidden;
  animation: cardFadeIn 0.4s ease both;
}

.app-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  background: radial-gradient(circle at 50% 0%, var(--glow-color), transparent 60%);
  opacity: 0;
  transition: opacity var(--transition-medium);
  pointer-events: none;
}

.app-card:hover {
  transform: translateY(-4px);
  background: var(--bg-card-hover);
  border-color: var(--border-card-hover);
  box-shadow: var(--shadow-card-hover);
}

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

@keyframes cardFadeIn {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.app-card:nth-child(1) { animation-delay: 0s; }
.app-card:nth-child(2) { animation-delay: 0.08s; }
.app-card:nth-child(3) { animation-delay: 0.16s; }
.app-card:nth-child(4) { animation-delay: 0.24s; }
.app-card:nth-child(5) { animation-delay: 0.32s; }
.app-card:nth-child(6) { animation-delay: 0.40s; }

/* Card Header: Icon + Title row */
.app-card__header {
  display: flex;
  align-items: center;
  gap: 14px;
}

.app-card__icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  flex-shrink: 0;
  box-shadow: 0 4px 14px rgba(139, 92, 246, 0.25);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.app-card:hover .app-card__icon {
  transform: scale(1.05);
  box-shadow: 0 6px 20px rgba(139, 92, 246, 0.35);
}

.app-card__title-group {
  flex: 1;
  min-width: 0;
}

.app-card__title {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.3;
  color: var(--text-primary);
}

.app-card__category {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent-3);
  margin-top: 2px;
}

/* Card Body */
.app-card__description {
  font-size: 0.92rem;
  line-height: 1.65;
  color: var(--text-secondary);
  flex: 1;
}

/* Card Footer */
.app-card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 12px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.app-card__date {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 500;
}

.app-card__link-icon {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.05);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  color: var(--text-muted);
  transition: all var(--transition-fast);
}

.app-card:hover .app-card__link-icon {
  background: var(--accent-gradient);
  color: #fff;
  transform: translateX(2px);
}

/* ============================================
   Footer
   ============================================ */
.footer {
  text-align: center;
  padding: 32px 0;
  border-top: 1px solid var(--border-card);
  color: var(--text-muted);
  font-size: 0.82rem;
}

.footer a {
  color: var(--accent-3);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer a:hover {
  color: var(--accent-1);
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
  .header {
    padding: 32px 0 20px;
  }

  .header__logo {
    font-size: 2.2rem;
  }

  .header__tagline {
    font-size: 0.95rem;
  }

  .controls {
    flex-direction: column;
    align-items: flex-start;
  }

  .app-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .app-card {
    padding: 22px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .header__logo {
    font-size: 1.8rem;
  }

  .sort-btn {
    padding: 6px 12px;
    font-size: 0.8rem;
  }
}