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

:root {
  --font-main: 'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-mono: 'Fira Code', 'Cascadia Code', monospace;
  --max-width: 1200px;
  --header-height: 70px;
  --radius: 12px;
  --radius-sm: 6px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

body {
  font-family: var(--font-main);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background var(--transition), color var(--transition);
}

body.low-spec * {
  animation: none !important;
  transition: none !important;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  z-index: 10000;
  padding: 8px 16px;
  background: var(--accent);
  color: #fff;
  border-radius: var(--radius-sm);
  font-weight: 600;
}
.skip-link:focus { top: 16px; }

header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  background: var(--header-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 2rem;
  transition: background var(--transition), border-color var(--transition);
}

.header-inner {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 1.3rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

nav {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

nav a {
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  transition: all var(--transition);
  white-space: nowrap;
}
nav a:hover, nav a:focus-visible {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  text-decoration: none;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.lang-switcher {
  display: flex;
  background: var(--bg-tertiary);
  border-radius: var(--radius-sm);
  overflow: hidden;
}
.lang-switcher button {
  padding: 0.35rem 0.7rem;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
}
.lang-switcher button.active {
  background: var(--accent);
  color: #fff;
}
.lang-switcher button:hover:not(.active) {
  color: var(--text-primary);
}

.icon-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  transition: all var(--transition);
}
.icon-btn:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.toggle-switch {
  position: relative;
  width: 44px;
  height: 24px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 12px;
  cursor: pointer;
  transition: all var(--transition);
}
.toggle-switch::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 18px;
  height: 18px;
  background: var(--text-secondary);
  border-radius: 50%;
  transition: all var(--transition);
}
.toggle-switch.active {
  background: var(--accent);
  border-color: var(--accent);
}
.toggle-switch.active::after {
  left: 22px;
  background: #fff;
}

main {
  padding-top: var(--header-height);
}

section {
  padding: 5rem 2rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
  background: linear-gradient(135deg, var(--text-primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-desc {
  color: var(--text-secondary);
  font-size: 1.1rem;
  margin-bottom: 2rem;
  max-width: 600px;
}

.hero {
  min-height: calc(100vh - var(--header-height));
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  overflow: hidden;
  padding: 2rem;
}

.hero-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary), var(--text-primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: clamp(1rem, 2vw, 1.3rem);
  color: var(--text-secondary);
  max-width: 550px;
  margin: 0 auto 2rem;
}

.hero-btn {
  display: inline-block;
  padding: 1rem 2.5rem;
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  color: #fff;
  border: none;
  border-radius: 50px;
  font-size: 1.1rem;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition);
  box-shadow: 0 4px 20px var(--accent-glow);
}
.hero-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--accent-glow);
}

.canvas-container {
  width: 100%;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  position: relative;
}

.canvas-container canvas {
  display: block;
  width: 100%;
}

.game-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.game-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: all var(--transition);
}
.game-card:hover {
  border-color: var(--accent);
  box-shadow: 0 0 30px var(--accent-glow);
}

.game-card h3 {
  font-size: 1.3rem;
  margin-bottom: 1rem;
  color: var(--accent);
}

.game-controls {
  display: flex;
  gap: 0.5rem;
  margin-top: 1rem;
  flex-wrap: wrap;
}

.btn {
  padding: 0.5rem 1.2rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
}
.btn:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.btn.primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.btn.primary:hover {
  background: var(--accent-secondary);
}

.sort-container {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.sort-bars {
  display: flex;
  align-items: flex-end;
  gap: 2px;
  height: 300px;
  padding: 1rem 0;
}

.sort-bar {
  flex: 1;
  background: linear-gradient(to top, var(--accent), var(--accent-secondary));
  border-radius: 2px 2px 0 0;
  transition: height 0.05s ease;
  min-width: 2px;
}

.audio-container {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.piano {
  display: flex;
  justify-content: center;
  gap: 4px;
  margin: 1.5rem 0;
  flex-wrap: wrap;
}

.piano-key {
  width: 48px;
  height: 140px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 0 0 6px 6px;
  cursor: pointer;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding-bottom: 8px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: all 0.1s ease;
  user-select: none;
}
.piano-key:hover {
  background: var(--accent);
  color: #fff;
}
.piano-key:active, .piano-key.active {
  background: var(--accent-secondary);
  color: #fff;
  transform: scaleY(0.97);
}

.pokemon-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.pokemon-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  text-align: center;
  transition: all var(--transition);
}
.pokemon-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
}

.pokemon-card img {
  width: 96px;
  height: 96px;
  image-rendering: pixelated;
}

.pokemon-card .name {
  font-weight: 700;
  text-transform: capitalize;
  margin: 0.5rem 0;
}

.pokemon-card .types {
  display: flex;
  gap: 0.3rem;
  justify-content: center;
  flex-wrap: wrap;
}

.type-badge {
  padding: 0.15rem 0.5rem;
  border-radius: 50px;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  color: #fff;
}

.search-input {
  width: 100%;
  max-width: 400px;
  padding: 0.75rem 1.2rem;
  border: 1px solid var(--border);
  border-radius: 50px;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-size: 1rem;
  transition: all var(--transition);
}
.search-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
}

.about-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: all var(--transition);
}
.about-card:hover {
  border-color: var(--accent);
}

.about-card h3 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
  color: var(--accent);
}

.about-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

footer {
  text-align: center;
  padding: 2rem;
  border-top: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.25rem;
}

@media (max-width: 768px) {
  .mobile-menu-btn { display: block; }
  nav {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--header-bg);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 1rem;
    border-bottom: 1px solid var(--border);
    gap: 0.25rem;
  }
  nav.open { display: flex; }
  nav a { padding: 0.75rem 1rem; font-size: 1rem; }
  .header-controls { gap: 0.5rem; }
  section { padding: 3rem 1rem; }
  .section-title { font-size: 1.7rem; }
  .piano-key { width: 36px; height: 100px; font-size: 0.65rem; }
}

.low-spec-banner {
  display: none;
  text-align: center;
  padding: 0.5rem;
  background: var(--accent);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 600;
}
.low-spec-banner.visible { display: block; }