:root {
  --bg: #0a0a0c;
  --surface: #141418;
  --surface-accent: #1c1c24;
  --text: #e0e0e6;
  --text-dim: #9494a5;
  --primary: #5c7cfa;
  --primary-glow: rgba(92, 124, 250, 0.2);
  --accent: #f06595;
  --border: #2d2d3a;
  --radius-lg: 12px;
  --radius-md: 8px;
  --font-serif: "Crimson Pro", Georgia, serif;
  --font-sans: "Inter", system-ui, -apple-system, sans-serif;
  --font-mono: "Fira Code", monospace;
}

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

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* Typography */
h1, h2, h3 {
  font-family: var(--font-serif);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.text-gradient {
  background: linear-gradient(135deg, #fff 0%, var(--primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Layout */
.app-container {
  display: flex;
  min-height: 100vh;
}

/* Sidebar */
.sidebar {
  width: 320px;
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 0;
  height: 100vh;
  z-index: 100;
}

.sidebar-header {
  padding: 2rem;
  border-bottom: 1px solid var(--border);
}

.logo {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-icon {
  width: 32px;
  height: 32px;
  background: var(--primary);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  box-shadow: 0 4px 12px var(--primary-glow);
}

.search-container {
  padding: 1.5rem;
}

.search-input-wrapper {
  position: relative;
  width: 100%;
}

.search-input {
  width: 100%;
  background: var(--surface-accent);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem 0.75rem 2.5rem;
  color: var(--text);
  font-size: 0.9rem;
  transition: all 0.2s ease;
}

.search-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-glow);
}

.search-icon {
  position: absolute;
  left: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-dim);
}

.nav-list {
  flex: 1;
  overflow-y: auto;
  padding: 1rem;
}

.nav-category {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  margin: 1.5rem 0 0.5rem 0.5rem;
}

.nav-item {
  display: flex;
  align-items: center;
  padding: 0.6rem 0.75rem;
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--text-dim);
  transition: all 0.2s ease;
  margin-bottom: 2px;
  font-size: 0.95rem;
}

.nav-item:hover {
  background: var(--surface-accent);
  color: var(--text);
}

.nav-item.active {
  background: var(--primary-glow);
  color: var(--primary);
  font-weight: 600;
}

/* Main Content */
.main-content {
  flex: 1;
  padding: 3rem;
  max-width: 1000px;
  margin: 0 auto;
}

.hero {
  margin-bottom: 4rem;
  animation: fadeIn 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.breadcrumb {
  display: flex;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.entry-title {
  font-size: 4.5rem;
  line-height: 1;
  margin-bottom: 1.5rem;
}

.phonetic {
  font-family: var(--font-mono);
  color: var(--primary);
  font-size: 1.25rem;
  margin-bottom: 2rem;
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: var(--primary-glow);
  border-radius: 4px;
}

.definition-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  margin-bottom: 2rem;
  position: relative;
  overflow: hidden;
}

.definition-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--primary);
}

.definition-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--primary);
  font-weight: 700;
  margin-bottom: 1rem;
  display: block;
}

.definition-text {
  font-size: 1.5rem;
  color: var(--text);
  margin-bottom: 2rem;
  font-family: var(--font-serif);
}

.examples-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}

.example-item {
  background: var(--surface-accent);
  padding: 1.5rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
}

.example-title {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-bottom: 0.5rem;
}

.example-content {
  font-weight: 600;
  color: var(--text);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 3rem;
}

.stat-card {
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  text-align: center;
}

.stat-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
  display: block;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-dim);
  text-transform: uppercase;
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Utils */
.badge {
  display: inline-flex;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
  background: var(--surface-accent);
  color: var(--text-dim);
  border: 1px solid var(--border);
}

.badge-primary {
  background: var(--primary-glow);
  color: var(--primary);
  border-color: transparent;
}

/* Grid Layout for Dictionary Index */
.index-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.index-card {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 1.5rem;
  border-radius: var(--radius-md);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  cursor: pointer;
  text-decoration: none;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.index-card:hover {
  border-color: var(--primary);
  transform: translateY(-4px);
  box-shadow: 0 10px 30px -10px rgba(0,0,0,0.5);
}

.index-card h3 {
  color: var(--text);
  margin-bottom: 0.5rem;
  font-family: var(--font-serif);
  font-size: 1.25rem;
}

.index-card p {
  font-size: 0.9rem;
  color: var(--text-dim);
  flex-grow: 1;
}

.index-card .meta {
  margin-top: 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}