:root {
  --bg: #f4f4f9;
  --text: #1f1f2e;
  --card-bg: #ffffff;
  --primary: #5a6cff;
  --hover: #3b4bd1;
  --radius: 24px;
  --transition: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --bg: #121212;
  --text: #e0e0f0;
  --card-bg: #1f1f2e;
  --primary: #7c8cff;
  --hover: #5a6cff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-size: 1.25rem;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  transition: background 0.4s ease, color 0.4s ease;
  overflow-x: hidden;
}

header {
  background: var(--card-bg);
  padding: 1rem;
  text-align: center;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  position: sticky;
  top: 0;
  z-index: 50;
}

.search-container {
  max-width: 600px;
  margin: 0 auto;
  width: 100%;
  padding: 0 1rem;
}

.search-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  width: 100%;
}

#searchInput {
  flex: 1;
  height: 44px;
  padding: 0.75rem 1.5rem;
  border-radius: 2rem;
  border: 2px solid var(--primary);
  background: var(--bg);
  color: var(--text);
  font-size: 1rem;
  transition: all var(--transition);
}

.theme-toggle {
  height: 44px;
  width: 44px;
  padding: 0.6rem;
  border: 2px solid var(--primary);
  background: var(--card-bg);
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.theme-toggle img {
  width: 20px;
  height: 20px;
}

.services {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  max-width: 1200px;
  margin: 3rem auto 0;
  padding: 0 2rem;
}

.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 2rem;
  text-align: center;
  cursor: pointer;
  box-shadow: 0 6px 18px rgba(0,0,0,0.05);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 200px;
  justify-content: center;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--primary);
  opacity: 0;
  transition: opacity var(--transition);
  z-index: 0;
}

.card > * {
  position: relative;
  z-index: 1;
}

.card:hover::before {
  opacity: 0.05;
}

.card h3 {
  margin: 1rem 0 0;
  transition: color var(--transition);
  font-size: clamp(1rem, 2vw, 1.25rem);
  width: 100%;
  overflow-wrap: break-word;
  word-wrap: break-word;
  hyphens: auto;
}

.card img {
  width: clamp(3rem, 8vw, 5rem);
  height: clamp(3rem, 8vw, 5rem);
  object-fit: contain;
  transition: transform var(--transition);
  will-change: transform;
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 28px rgba(0,0,0,0.15);
}

.card:hover img {
  transform: scale(1.1);
}

.overlay {
  position: fixed;
  inset: 0;
  backdrop-filter: blur(20px);
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s ease;
  z-index: 100;
}

.overlay.show {
  opacity: 1;
  pointer-events: all;
}

.modal {
  background: var(--card-bg);
  padding: 5rem 3rem;
  border-radius: var(--radius);
  text-align: center;
  width: 95%;
  max-width: 900px;
  max-height: 95vh;
  overflow-y: auto;
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  transform: translateX(0);
  transition: transform 0.3s ease;
  scrollbar-width: thin;
  scrollbar-color: var(--primary) transparent;
  will-change: transform;
  -webkit-overflow-scrolling: touch;
  touch-action: pan-x pan-y;
  backface-visibility: hidden;
  perspective: 1000px;
}

.modal.dragging {
  transition: none;
  touch-action: none;
}

.modal.slide-left {
  animation: slideLeft 0.3s cubic-bezier(0.4, 0.0, 0.2, 1) forwards;
}

.modal.slide-right {
  animation: slideRight 0.3s cubic-bezier(0.4, 0.0, 0.2, 1) forwards;
}

@keyframes slideLeft {
  from { transform: translateX(0); }
  to { transform: translateX(-100%) translateZ(0); }
}

@keyframes slideRight {
  from { transform: translateX(0); }
  to { transform: translateX(100%) translateZ(0); }
}

.modal-content {
  width: 100%;
  max-width: calc(100% - 6rem);
  margin: 0 auto;
  padding: 0 1rem;
}

.modal::-webkit-scrollbar {
  width: 8px;
}

.modal::-webkit-scrollbar-track {
  background: transparent;
}

.modal::-webkit-scrollbar-thumb {
  background-color: var(--primary);
  border-radius: 20px;
}

.modal img {
  width: 6rem;
  height: 6rem;
  margin-bottom: 1.5rem;
}

.btn-group {
  margin-top: 2rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
}

.btn-link {
  padding: 1rem 2rem;
  border-radius: 2rem;
  background: var(--primary);
  color: #fff;
  text-decoration: none;
  font-size: 1.25rem;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.btn-link::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: width 0.6s ease, height 0.6s ease;
}

.btn-link:hover::before {
  width: 300%;
  height: 300%;
}

.btn-link.secondary {
  background: transparent;
  border: 2px solid var(--primary);
  color: var(--primary);
}

.btn-link:hover {
  background: var(--hover);
}

.btn-link.secondary:hover {
  background: rgba(90, 108, 255, 0.1);
  color: var(--hover);
}

.close-btn {
  position: absolute;
  top: 1.25rem;
  right: 1.5rem;
  background: none;
  color: var(--text);
  border: none;
  font-size: 2.5rem;
  cursor: pointer;
  z-index: 160;
  pointer-events: auto;
}

.arrow-btn {
  position: fixed;
  top: 50%;
  transform: translateY(-50%);
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 50%;
  width: 3rem;
  height: 3rem;
  font-size: 1.5rem;
  cursor: pointer;
  transition: all var(--transition);
  opacity: 0.8;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  z-index: 150;
  pointer-events: auto;
}

.overlay:not(.show) .arrow-btn {
  pointer-events: none;
  opacity: 0;
}

.arrow-btn:hover {
  opacity: 1;
  transform: translateY(-50%) scale(1.1);
}

.arrow-left { left: 2rem; }
.arrow-right { right: 2rem; }

/* Responsive */
@media (max-width: 600px) {
  body { font-size: 1rem; }

  header {
    padding: 1rem;
  }

  .services {
    grid-template-columns: 1fr;
    gap: 1rem;
    padding: 0.5rem;
  }

  .card {
    min-height: 100px;
    padding: 1rem;
    flex-direction: row;
    justify-content: flex-start;
    gap: 1rem;
  }

  .card img {
    width: 40px;
    height: 40px;
  }

  .modal {
    padding: 2rem 1rem;
    margin: 1rem;
    width: calc(100% - 2rem);
  }

  .btn-group {
    flex-direction: column;
    width: 100%;
  }

  .btn-link {
    width: 100%;
    text-align: center;
  }

  .arrow-btn {
    display: none;
  }

  .theme-toggle {
    margin: 1rem;
  }

  .search-container {
    padding: 0 1rem;
  }
}

/* Theme Background Effects */
.theme-background {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: -1;
  overflow: hidden;
}

.sun, .moon {
  position: absolute;
  width: 150px;
  height: 150px;
  border-radius: 50%;
  left: 50%;
  transform: translateX(-50%);
  transition: transform 1s cubic-bezier(0.4, 0, 0.2, 1),
              top 1s cubic-bezier(0.4, 0, 0.2, 1),
              bottom 1s cubic-bezier(0.4, 0, 0.2, 1);
}

.sun {
  background: #FFD700;
  box-shadow: 0 0 50px #FFD700;
  bottom: -200px;
}

.moon {
  background: #C2C5CC;
  box-shadow: 0 0 50px #C2C5CC;
  top: -200px;
}

body[data-theme="dark"] .moon {
  transform: translateX(-50%) translateY(0);
  top: 75%;
}

body[data-theme="dark"] .sun {
  transform: translateX(-50%) translateY(200px);
  bottom: -200px;
}

body[data-theme="light"] .sun {
  transform: translateX(-50%) translateY(0);
  bottom: 75%;
}

body[data-theme="light"] .moon {
  transform: translateX(-50%) translateY(-200px);
  top: -200px;
}

.stars {
  position: absolute;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity 1s ease;
  background-image:
    radial-gradient(1px 1px at 5% 5%, white 100%, transparent),
    radial-gradient(2px 2px at 15% 15%, white 100%, transparent),
    radial-gradient(1px 1px at 25% 25%, white 100%, transparent),
    radial-gradient(1.5px 1.5px at 35% 35%, white 100%, transparent),
    radial-gradient(1px 1px at 45% 45%, white 100%, transparent),
    radial-gradient(2px 2px at 55% 55%, white 100%, transparent),
    radial-gradient(1.5px 1.5px at 65% 65%, white 100%, transparent),
    radial-gradient(1px 1px at 75% 75%, white 100%, transparent),
    radial-gradient(2px 2px at 85% 85%, white 100%, transparent),
    radial-gradient(1px 1px at 95% 95%, white 100%, transparent),
    radial-gradient(1.5px 1.5px at 10% 90%, white 100%, transparent),
    radial-gradient(1px 1px at 20% 80%, white 100%, transparent),
    radial-gradient(2px 2px at 30% 70%, white 100%, transparent),
    radial-gradient(1px 1px at 40% 60%, white 100%, transparent),
    radial-gradient(1.5px 1.5px at 50% 50%, white 100%, transparent),
    radial-gradient(1px 1px at 60% 40%, white 100%, transparent),
    radial-gradient(2px 2px at 70% 30%, white 100%, transparent),
    radial-gradient(1.5px 1.5px at 80% 20%, white 100%, transparent),
    radial-gradient(1px 1px at 90% 10%, white 100%, transparent);
  background-size: 300% 300%;
}

.satellite {
  position: absolute;
  width: 2px;
  height: 2px;
  background: white;
  border-radius: 50%;
  top: -10px;
  left: -10px;
  box-shadow: 0 0 3px 1px rgba(255, 255, 255, 0.5);
  opacity: 0;
  pointer-events: none;
}

body[data-theme="dark"] .satellite {
  animation: satelliteMove 15s linear infinite;
  opacity: 1;
}

body[data-theme="dark"] .stars {
  opacity: 0.8;
  animation: twinkle 4s ease-in-out infinite alternate;
}

@keyframes twinkle {
  0% {
    opacity: 0.6;
  }
  100% {
    opacity: 0.9;
  }
}

@keyframes satelliteMove {
  0% {
    transform: translate(-10px, 110vh) rotate(45deg);
  }
  100% {
    transform: translate(110vw, -10px) rotate(45deg);
  }
}

/* Version Badge */
.version-badge {
  position: fixed;
  bottom: 1rem;
  left: 1rem;
  padding: 0.5rem 1rem;
  background: var(--card-bg);
  color: var(--text);
  border: 2px solid var(--primary);
  border-radius: 2rem;
  font-size: 0.85rem;
  font-weight: 600;
  z-index: 40;
  opacity: 0.7;
  transition: all var(--transition);
  cursor: pointer;
  user-select: none;
  backdrop-filter: blur(10px);
}

.version-badge:hover {
  opacity: 1;
  transform: scale(1.05);
  background: var(--primary);
  color: white;
}

.version-badge:focus {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

@media (max-width: 600px) {
  .version-badge {
    bottom: 0.5rem;
    left: 0.5rem;
    padding: 0.35rem 0.75rem;
    font-size: 0.75rem;
  }
}

/* Changelog Modal */
.changelog-overlay {
  position: fixed;
  inset: 0;
  backdrop-filter: blur(20px);
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s ease;
  z-index: 200;
}

.changelog-overlay.show {
  opacity: 1;
  pointer-events: all;
}

.changelog-modal {
  background: var(--card-bg);
  padding: 3rem 2rem 2rem;
  border-radius: var(--radius);
  width: 90%;
  max-width: 800px;
  max-height: 85vh;
  overflow-y: auto;
  position: relative;
  scrollbar-width: thin;
  scrollbar-color: var(--primary) transparent;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.changelog-modal::-webkit-scrollbar {
  width: 8px;
}

.changelog-modal::-webkit-scrollbar-track {
  background: transparent;
}

.changelog-modal::-webkit-scrollbar-thumb {
  background-color: var(--primary);
  border-radius: 20px;
}

.changelog-content {
  color: var(--text);
}

.changelog-content h2 {
  margin-top: 0;
  margin-bottom: 2rem;
  color: var(--primary);
  font-size: 2rem;
  text-align: center;
}

.version-section {
  margin-bottom: 3rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid rgba(90, 108, 255, 0.2);
}

.version-section:last-child {
  border-bottom: none;
  margin-bottom: 0;
}

.version-section h3 {
  color: var(--primary);
  margin-bottom: 1.5rem;
  font-size: 1.5rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.version-date {
  font-size: 0.9rem;
  font-weight: normal;
  color: var(--text);
  opacity: 0.7;
}

.changelog-category {
  margin-bottom: 1.5rem;
}

.changelog-category h4 {
  color: var(--text);
  margin-bottom: 0.75rem;
  font-size: 1.1rem;
  font-weight: 600;
}

.changelog-category ul {
  margin: 0;
  padding-left: 1.5rem;
  line-height: 1.8;
}

.changelog-category ul ul {
  margin-top: 0.5rem;
  font-size: 0.95rem;
  opacity: 0.9;
}

.changelog-category li {
  margin-bottom: 0.5rem;
}

.changelog-category strong {
  color: var(--primary);
}

@media (max-width: 600px) {
  .changelog-modal {
    width: 95%;
    padding: 2rem 1rem 1rem;
    max-height: 90vh;
  }

  .changelog-content h2 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
  }

  .version-section h3 {
    font-size: 1.2rem;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
  }

  .changelog-category h4 {
    font-size: 1rem;
  }

  .changelog-category ul {
    padding-left: 1.25rem;
    font-size: 0.9rem;
  }
}