:root {
  --bg: #f6f8fa;
  --bg-dark: #181c24;
  --card-bg: #fff;
  --card-bg-dark: #23283a;
  --text: #222;
  --text-dark: #f6f8fa;
  --accent: #6c63ff;
  --accent2: #00c9a7;
  --shadow: 0 4px 24px rgba(108,99,255,0.08);
  --shadow-dark: 0 4px 24px rgba(0,0,0,0.25);
}

body {
  font-family: 'Inter', sans-serif;
  background: var(--bg);
  color: var(--text);
  margin: 0;
  min-height: 100vh;
  transition: background 0.4s, color 0.4s;
  overflow-x: hidden;
}
body.dark {
  background: var(--bg-dark);
  color: var(--text-dark);
}

#particle-bg {
  position: fixed;
  top: 0; left: 0; width: 100vw; height: 100vh;
  z-index: 0;
  pointer-events: none;
}

.top-bar {
  position: fixed;
  top: 0; left: 0; width: 100vw;
  height: 64px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  z-index: 2;
  box-shadow: 0 2px 12px rgba(108,99,255,0.08);
}
.site-title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 1px;
}
#dark-toggle {
  background: rgba(255,255,255,0.15);
  border: none;
  border-radius: 50%;
  width: 40px; height: 40px;
  font-size: 1.3rem;
  color: #fff;
  cursor: pointer;
  transition: background 0.2s;
}
#dark-toggle:hover {
  background: rgba(0,0,0,0.15);
}

main {
  padding-top: 80px;
  display: flex;
  justify-content: center;
}
.cards-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 2rem;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  z-index: 1;
}
.folder-card {
  display: flex;
  flex-direction: column;
  background: var(--card-bg);
  border-radius: 18px;
  box-shadow: var(--shadow);
  text-decoration: none;
  color: inherit;
  overflow: hidden;
  transition: transform 0.18s cubic-bezier(.4,2,.6,1), box-shadow 0.18s, background 0.4s;
  position: relative;
  min-height: 320px;
  opacity: 0;
  animation: fadeInUp 0.7s cubic-bezier(.4,2,.6,1) forwards;
}
body.dark .folder-card {
  background: var(--card-bg-dark);
  box-shadow: var(--shadow-dark);
}
.folder-card:hover {
  transform: translateY(-8px) scale(1.03);
  box-shadow: 0 8px 32px rgba(108,99,255,0.18);
  background: linear-gradient(120deg, var(--accent) 0%, var(--card-bg) 100%);
}
body.dark .folder-card:hover {
  background: linear-gradient(120deg, var(--accent2) 0%, var(--card-bg-dark) 100%);
}
.thumb-wrapper {
  width: 100%;
  aspect-ratio: 16/9;
  background: linear-gradient(120deg, var(--accent) 30%, var(--accent2) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.thumb-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  border-bottom: 1px solid #eee;
}
.no-thumb {
  color: #fff;
  font-size: 1.1rem;
  opacity: 0.7;
  letter-spacing: 1px;
}
.card-info {
  padding: 1.2rem 1rem 1rem 1rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}
.card-info h2 {
  margin: 0 0 0.5rem 0;
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  color: var(--accent);
  transition: color 0.3s;
}
body.dark .card-info h2 {
  color: var(--accent2);
}
.date {
  font-size: 0.95rem;
  color: #888;
  margin-top: auto;
}
body.dark .date {
  color: #b3b3b3;
}

@media (max-width: 700px) {
  .cards-container {
    gap: 1.2rem;
    padding: 0 0.5rem;
  }
  .top-bar {
    padding: 0 1rem;
    height: 54px;
  }
  main {
    padding-top: 66px;
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(32px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}