:root {
  --bg-deep: #06060a;
  --bg-surface: #0b0b12;
  --bg-elevated: #10101a;
  --bg-card-hover: #141420;
  --border: rgba(255, 255, 255, 0.06);
  --accent-1: #ff4da6;
  --accent-2: #6a5af9;
  --accent-3: #00d4ff;
  --text: #eaeaef;
  --text-secondary: #9494a4;
  --text-muted: #585868;
  --radius: 16px;
  --radius-pill: 999px;
  --max-w: 1180px;
  --ease-spring: cubic-bezier(0.2, 0.9, 0.4, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Poppins', system-ui, -apple-system, sans-serif;
  background: var(--bg-deep);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 44px 20px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(ellipse 80% 60% at 0% 20%, rgba(106, 90, 249, 0.06) 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 100% 80%, rgba(255, 77, 166, 0.05) 0%, transparent 60%),
    radial-gradient(ellipse 50% 40% at 50% 50%, rgba(0, 212, 255, 0.03) 0%, transparent 50%);
  animation: bgShift 20s var(--ease-out) infinite alternate;
}

@keyframes bgShift {
  0% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(2%, -1%) scale(1.02); }
  66% { transform: translate(-1%, 1%) scale(0.98); }
  100% { transform: translate(1%, 0) scale(1.01); }
}

body::after {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 999;
  opacity: 0.02;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 256px 256px;
}

.wrap {
  width: 100%;
  max-width: var(--max-w);
  position: relative;
  z-index: 1;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 0;
  margin-bottom: 44px;
  border-bottom: 1px solid var(--border);
  animation: headerSlide 0.8s var(--ease-out) both;
}

@keyframes headerSlide {
  from { opacity: 0; transform: translateY(-12px); }
  to { opacity: 1; transform: translateY(0); }
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.logo {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 16px;
  color: #fff;
  flex-shrink: 0;
  transition: transform 0.4s var(--ease-spring), box-shadow 0.4s var(--ease-spring);
}

.logo:hover {
  transform: scale(1.08) rotate(-3deg);
  box-shadow: 0 0 36px rgba(106, 90, 249, 0.25);
}

.title {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.subtitle {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 1px;
}

.ribbon {
  font-size: 12px;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-weight: 500;
  white-space: nowrap;
  transition: border-color 0.3s, background 0.3s;
}

.ribbon:hover {
  border-color: rgba(255, 255, 255, 0.1);
  background: rgba(255, 255, 255, 0.05);
}

.controls {
  display: flex;
  gap: 12px;
  margin-bottom: 36px;
  align-items: center;
  animation: controlsSlide 0.8s var(--ease-out) 0.15s both;
}

@keyframes controlsSlide {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

.search-box {
  flex: 1;
  min-width: 200px;
  position: relative;
}

.search-box input {
  width: 100%;
  padding: 11px 16px 11px 40px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border);
  background: var(--bg-surface);
  color: var(--text);
  font-size: 13px;
  font-family: inherit;
  outline: none;
  transition:
    border-color 0.4s var(--ease-spring),
    box-shadow 0.4s var(--ease-spring),
    background 0.4s var(--ease-spring);
}

.search-box input::placeholder {
  color: var(--text-muted);
  transition: color 0.3s;
}

.search-box input:focus {
  border-color: rgba(255, 255, 255, 0.15);
  box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.02), 0 0 24px rgba(106, 90, 249, 0.05);
  background: rgba(255, 255, 255, 0.02);
}

.search-box input:focus::placeholder {
  color: transparent;
}

.search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 13px;
  pointer-events: none;
  transition: color 0.3s;
}

.search-box input:focus ~ .search-icon {
  color: var(--text-secondary);
}

.sort-controls {
  display: flex;
  gap: 4px;
  background: var(--bg-surface);
  padding: 3px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border);
  flex-shrink: 0;
}

.sort-btn {
  padding: 7px 14px;
  border-radius: var(--radius-pill);
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-size: 12px;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.35s var(--ease-spring);
}

.sort-btn:hover {
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.05);
}

.sort-btn:active {
  transform: scale(0.94);
}

.sort-btn.active {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text);
}

.alphabet-index {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-bottom: 32px;
  justify-content: center;
  animation: alphaFade 0.8s var(--ease-out) 0.3s both;
}

@keyframes alphaFade {
  from { opacity: 0; }
  to { opacity: 1; }
}

.letter-btn {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: transparent;
  color: var(--text-muted);
  border: none;
  cursor: pointer;
  transition: all 0.3s var(--ease-spring);
  font-size: 12px;
  font-weight: 500;
  font-family: inherit;
}

.letter-btn:hover {
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.05);
  transform: translateY(-1px);
}

.letter-btn:active {
  transform: scale(0.88);
}

.letter-btn.active {
  color: #fff;
  background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
  box-shadow: 0 2px 12px rgba(106, 90, 249, 0.3);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.card {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  padding: 24px;
  cursor: pointer;
  opacity: 0;
  transform: translateY(20px);
  animation: cardIn 0.7s var(--ease-out) forwards;
  transition:
    transform 0.5s var(--ease-spring),
    box-shadow 0.5s var(--ease-spring);
  display: flex;
  flex-direction: column;
}

@keyframes cardIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.card::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    linear-gradient(120deg, var(--accent-1), var(--accent-2), var(--accent-3));
  opacity: 0.18;
  transition: opacity 0.5s var(--ease-spring);
}

.card::after {
  content: '';
  position: absolute;
  inset: 1px;
  background: var(--bg-elevated);
  border-radius: calc(var(--radius) - 1px);
  z-index: 0;
  transition: background 0.5s var(--ease-spring);
}

.card:hover::before {
  opacity: 0.38;
}

.card:hover::after {
  background: var(--bg-card-hover);
}

.card:hover {
  transform: translateY(-8px);
  box-shadow:
    0 30px 70px rgba(0, 0, 0, 0.5),
    0 0 50px rgba(106, 90, 249, 0.08);
}

.card:focus-within,
.card.touch-active {
  opacity: 1;
  transform: translateY(-8px);
  outline: none;
  box-shadow:
    0 30px 70px rgba(0, 0, 0, 0.5),
    0 0 0 2px rgba(255, 77, 166, 0.25),
    0 0 0 4px rgba(106, 90, 249, 0.12),
    0 0 50px rgba(106, 90, 249, 0.1);
}

.card:focus-within::before,
.card.touch-active::before {
  opacity: 0.5;
  animation: borderPulse 2s ease-in-out infinite;
}

.card:focus-within::after,
.card.touch-active::after {
  background: var(--bg-card-hover);
}

.card:focus-within h2,
.card.touch-active h2 {
  filter: brightness(1.2);
}

.card:focus-within .spotlight,
.card.touch-active .spotlight {
  opacity: 1;
  background: radial-gradient(
    500px circle at 50% 50%,
    rgba(255, 255, 255, 0.05) 0%,
    transparent 50%
  );
}

@keyframes borderPulse {
  0%, 100% { opacity: 0.4; filter: brightness(1); }
  50%      { opacity: 0.65; filter: brightness(1.15); }
}

.card:active {
  transform: translateY(-4px) scale(0.99);
}

.card a {
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  flex: 1;
  position: relative;
  z-index: 1;
}

.card a:focus-visible {
  outline: none;
}

.card h2 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
  background: linear-gradient(90deg, var(--accent-1), var(--accent-2), var(--accent-3));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  transition: filter 0.4s var(--ease-spring);
}

.card:hover h2 {
  filter: brightness(1.2);
}

.card p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.55;
  white-space: pre-line;
  flex: 1;
}

.card .spotlight {
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  border-radius: var(--radius);
  opacity: 0;
  transition: opacity 0.3s;
  background: radial-gradient(
    600px circle at var(--spot-x, 50%) var(--spot-y, 50%),
    rgba(255, 255, 255, 0.04) 0%,
    transparent 50%
  );
}

.card:hover .spotlight {
  opacity: 1;
}

.no-results {
  grid-column: 1 / -1;
  text-align: center;
  padding: 80px 20px;
  color: var(--text-muted);
  font-size: 14px;
  animation: fadeIn 0.5s var(--ease-out);
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

footer {
  margin-top: 52px;
  padding: 20px 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 12px;
  border-top: 1px solid var(--border);
  animation: footIn 0.8s var(--ease-out) 0.5s both;
}

@keyframes footIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

a:focus-visible {
  outline: 2px solid rgba(255, 77, 166, 0.4);
  outline-offset: 3px;
  border-radius: 4px;
}

button:focus-visible {
  outline: 2px solid rgba(255, 77, 166, 0.4);
  outline-offset: 2px;
}

input:focus-visible {
  outline: 2px solid rgba(255, 77, 166, 0.4);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  body::before {
    animation: none;
  }

  .card, header, .controls, .alphabet-index, footer {
    opacity: 1;
    transform: none;
  }
}

@media (max-width: 768px) {
  body {
    padding: 24px 16px;
  }

  header {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .controls {
    flex-direction: column;
    gap: 10px;
  }

  .search-box {
    width: 100%;
    min-width: 0;
  }

  .sort-controls {
    width: 100%;
  }

  .grid {
    grid-template-columns: 1fr;
  }
}