:root {
  --bg-color: #0d0d12;
  --card-bg: #16161e;
  --text-primary: #f0f0f5;
  --text-secondary: #a0a0b0;
  --accent: #6366f1;
  --accent-hover: #818cf8;
  --border: #2a2a35;
  --font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

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

body {
  background-color: var(--bg-color);
  color: var(--text-primary);
  font-family: var(--font-family);
  line-height: 1.6;
  min-height: 100vh;
  display: grid;
  grid-template-columns: 200px 1fr;
  grid-template-rows: auto 1fr;
  grid-template-areas:
    "sidebar header"
    "sidebar content";
}

header {
  grid-area: header;
  padding: 2rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: center;
  align-items: center;
}

.sidebar {
  grid-area: sidebar;
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1.5rem;
  padding: 3rem 2rem;
  height: 100vh;
  position: sticky;
  top: 0;
  background: rgba(0, 0, 0, 0.2);
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  width: 100%;
}

.sidebar-link {
  font-size: 1rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1rem;
  color: var(--text-secondary);
  transition: all 0.3s ease;
  white-space: nowrap;
  display: block;
  padding: 0.5rem 0;
}

.sidebar-link:hover {
  color: var(--accent);
  transform: translateX(5px);
}

.sidebar-link.active {
  color: var(--text-primary);
  border-left: 3px solid var(--accent);
  padding-left: 1rem;
}

main {
  grid-area: content;
  padding: 3rem;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.container {
  max-width: 1000px;
  width: 100%;
}

.nav-grid {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  width: 100%;
}

.nav-item {
  display: block;
  padding: 1rem 1.5rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  text-align: center;
  font-weight: 600;
}

.nav-item:hover {
  border-color: var(--accent);
  background: rgba(99, 102, 241, 0.05);
}

.gif-display {
  border-radius: 1rem;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--border);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
}

@media (max-width: 768px) {
  body {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto 1fr;
    grid-template-areas:
      "header"
      "sidebar"
      "content";
  }

  .sidebar {
    height: auto;
    width: 100%;
    position: static;
    flex-direction: row;
    padding: 1rem;
    justify-content: center;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }

  .vertical-menu-label {
    writing-mode: horizontal-tb;
    transform: none;
    font-size: 1.5rem;
    margin: 0;
  }

  main {
    padding: 1.5rem;
  }
}

h1 {
  font-size: 3rem;
  letter-spacing: 0.2rem;
  background: linear-gradient(135deg, var(--text-primary), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  text-transform: uppercase;
}

h2 {
  color: var(--accent);
  margin-bottom: 1rem;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: all 0.3s ease;
}

a:hover {
  color: var(--accent-hover);
  text-shadow: 0 0 10px rgba(99, 102, 241, 0.4);
}

.label-secondary {
  color: var(--text-secondary);
  font-size: 0.8rem;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
  letter-spacing: 0.1rem;
}

.home-btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border: 1px solid var(--accent);
  border-radius: 2rem;
  margin: 1rem 0;
}

.home-btn:hover {
  background: var(--accent);
  color: white;
}

.index-table {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 2rem;
}

.lyrics-container {
  display: flex;
  flex-direction: column;
  gap: 3rem;
  margin-top: 3rem;
}

.song-block {
  scroll-margin-top: 2rem;
}

.song-block p {
  white-space: pre-wrap;
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.01);
  padding: 1.5rem;
  border-left: 2px solid var(--accent);
  border-radius: 0 0.5rem 0.5rem 0;
}

.song-block b {
  display: block;
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.back-link {
  display: inline-block;
  margin-top: 1rem;
  font-size: 0.9rem;
  font-weight: 600;
}