:root {
  --bg-color: #f8f9fa;
  --text-color: #1a1a1a;
  --card-bg: rgba(255, 255, 255, 0.2);
  --card-border: rgba(255, 255, 255, 0.3);
  --card-shadow: 0 4px 24px rgba(0, 0, 0, 0.05);
  --coil-color: #1a1a1a;
  --accent-color: #000;
  --divider-color: #000;
}

body.dark-mode {
  --bg-color: #0a0a0a;
  --text-color: #e0e0e0;
  --card-bg: rgba(20, 20, 20, 0.4);
  --card-border: rgba(255, 255, 255, 0.08);
  --card-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
  --coil-color: #fff;
  --accent-color: #fff;
  --divider-color: #fff;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Outfit', 'Zhi Mang Xing', sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  overflow-x: hidden;
  transition: background-color 0.5s ease, color 0.5s ease;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Canvas Background */
#bg-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
  /* Let clicks pass through, but we track mouse via window listener */
}

/* Theme Toggle */
.theme-toggle {
  position: absolute;
  top: 2rem;
  right: 2rem;
  z-index: 100;
}

#toggle-theme {
  background: var(--card-bg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--card-border);
  border-radius: 50%;
  width: 48px;
  height: 48px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
  color: var(--text-color);
}

#toggle-theme svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  transition: transform 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

body:not(.dark-mode) .moon-icon {
  display: none;
}

body.dark-mode .sun-icon {
  display: none;
}

body:not(.dark-mode) .sun-icon {
  transform: rotate(0deg);
}

body.dark-mode .moon-icon {
  transform: rotate(360deg);
}

/* Layout */
.site-header {
  padding: 3rem 1rem 1rem;
  text-align: center;
}

.site-header h1 {
  font-size: 2.5rem;
  font-weight: 600;
}

.site-footer {
  padding: 2rem;
  text-align: center;
  opacity: 0.7;
  font-size: 0.9rem;
}

.container {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 2rem 2rem;
  gap: 4rem;
  max-width: 1400px;
  margin: 0 auto;
  flex: 1;
  width: 100%;
}

@media (min-width: 900px) {
  .container {
    flex-direction: row;
    align-items: flex-start;
    justify-content: space-between;
  }
}

.divider {
  width: 80%;
  height: 1px;
  background: var(--divider-color);
  display: block;
  margin: 0 auto;
}

@media (min-width: 900px) {
  .divider {
    width: 1px;
    height: auto;
    min-height: 480px;
    align-self: center;
    margin: 0;
  }
}

.category {
  flex: 1;
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.category-title {
  font-size: 2rem;
  font-weight: 600;
  margin-bottom: 3rem;
  letter-spacing: -0.02em;
  opacity: 0.8;
}

/* Cards Grid Layout Stability */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(266px, 1fr));
  gap: 2rem;
  width: 100%;
  max-width: 600px;
  /* Min-height to prevent layout shift on pagination (approx 2 rows of cards) */
  min-height: 336px;
}

/* Card Styles */
.card-link {
  text-decoration: none;
  color: inherit;
  display: block;
}

.card {
  background: var(--card-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--card-border);
  border-radius: 19px;
  padding: 1.9rem;
  transition: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
  position: relative;
  overflow: hidden;
  height: 152px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  box-shadow: var(--card-shadow);
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.1);
  border-color: var(--coil-color);
}

/* Coil Effect Wrapper */
.card-title-wrapper {
  position: relative;
  display: inline-block;
  margin-bottom: 0.8rem;
  padding: 0.2rem 0;
  /* Space for the coil */
}

/* The Coil (SVG or Border) - Using pseudo elements for a sleek "bracket/coil" look */
.card-title-wrapper::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 110%;
  height: 140%;
  transform: translate(-50%, -50%) scale(0.9);
  border: 1.5px solid var(--coil-color);
  border-radius: 50%;
  opacity: 1;
  transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  transform-origin: center;
  border-bottom-color: transparent;
  /* Open coil look */
  border-left-color: transparent;
  /* Irregular coil look */
  transform: translate(-50%, -50%) rotate(-10deg);
}

.card-title-wrapper::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 115%;
  height: 130%;
  border: 1.5px solid var(--coil-color);
  border-radius: 40%;
  opacity: 1;
  transition: all 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
  border-top-color: transparent;
  border-right-color: transparent;
  transform: translate(-50%, -50%) rotate(5deg);
}


.card-title {
  font-size: 1.5rem;
  font-weight: 600;
  position: relative;
  z-index: 2;
  transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  display: block;
}

/* Hover Inteaction: Title pops up, Coil expands/fades */
.card:hover .card-title {
  transform: translateY(-12px) scale(1.1);
}

.card:hover .card-title-wrapper::before {
  transform: translate(-50%, -80%) scale(1.1) rotate(0deg);
  opacity: 0.3;
}

.card:hover .card-title-wrapper::after {
  transform: translate(-50%, 0%) scale(1.2) rotate(0deg);
  opacity: 0.3;
}

.card-desc {
  font-size: 0.95rem;
  opacity: 0.7;
  line-height: 1.5;
  transform: translateY(0);
  transition: transform 0.4s ease, opacity 0.4s ease;
}

.card:hover .card-desc {
  transform: translateY(2px);
  opacity: 0.9;
}

/* Pagination */
.pagination {
  display: flex;
  gap: 0.5rem;
  margin-top: 2rem;
  justify-content: center;
}

.page-btn {
  background: var(--card-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--card-border);
  color: var(--text-color);
  padding: 0.5rem 1rem;
  font-family: inherit;
  font-size: 0.9rem;
  border-radius: 13px;
  /* Match card border radius */
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: var(--card-shadow);
}

.page-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  border-color: var(--coil-color);
}

.page-btn.active {
  background: var(--coil-color);
  color: var(--bg-color);
  border-color: var(--coil-color);
}