:root {
  --black: #000000;
  --white: #ffffff;
  --gray-50: #fafafa;
  --gray-100: #f5f5f5;
  --gray-200: #e5e5e5;
  --gray-300: #d4d4d4;
  --gray-400: #a3a3a3;
  --gray-500: #737373;
  --gray-600: #525252;
  --gray-700: #404040;
  --gray-800: #262626;
  --gray-900: #171717;
  --gray-950: #0a0a0a;
  --accent: #1db954;
  --accent-hover: #1ed760;
  --accent-muted: rgba(29, 185, 84, 0.1);
  --danger: #ff4444;
  --danger-muted: rgba(255, 68, 68, 0.1);
  --bg: var(--white);
  --bg-secondary: var(--gray-50);
  --surface: var(--white);
  --text: var(--gray-950);
  --text-secondary: var(--gray-500);
  --text-muted: var(--gray-400);
  --border: var(--gray-200);
  --border-hover: var(--gray-300);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.08);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --duration: 300ms;
  --duration-fast: 150ms;
  --max-width: 1200px;
  --max-narrow: 720px;
  --z-header: 100;
  --z-modal: 200;
  --z-toast: 300;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.5;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background var(--duration) var(--ease), color var(--duration) var(--ease);
  min-height: 100vh;
}

h1 {
  font-size: clamp(2.5rem, 8vw, 5rem);
  font-weight: 900;
  line-height: 0.95;
  letter-spacing: -0.04em;
  text-transform: uppercase;
}

h2 {
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
}

h3 {
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

p {
  color: var(--text-secondary);
  line-height: 1.7;
}

a {
  color: inherit;
  text-decoration: none;
}

code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--bg-secondary);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
}

::selection {
  background: var(--text);
  color: var(--bg);
}

:focus-visible {
  outline: 2px solid var(--text);
  outline-offset: 2px;
}

::-webkit-scrollbar {
  width: 4px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--gray-300);
  border-radius: var(--radius-full);
}

#app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.page-content {
  flex: 1;
  padding-top: 124px;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}
@media (min-width: 768px) {
  .container {
    padding: 0 48px;
  }
}

.container--narrow {
  max-width: var(--max-narrow);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0 24px;
  height: 44px;
  font-family: var(--font);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease);
  white-space: nowrap;
}
.btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}
.btn--primary {
  background: var(--text);
  color: var(--bg);
}
.btn--primary:hover:not(:disabled) {
  opacity: 0.8;
  transform: scale(1.02);
}
.btn--secondary {
  background: transparent;
  color: var(--text);
  border: 1.5px solid var(--border);
}
.btn--secondary:hover:not(:disabled) {
  border-color: var(--text);
}
.btn--danger {
  background: var(--danger);
  color: var(--white);
}
.btn--danger:hover:not(:disabled) {
  opacity: 0.85;
}
.btn--ghost {
  background: transparent;
  color: var(--text-secondary);
  padding: 0 12px;
}
.btn--ghost:hover:not(:disabled) {
  color: var(--text);
}
.btn--icon {
  width: 44px;
  padding: 0;
}
.btn--icon svg {
  width: 20px;
  height: 20px;
}
.btn--sm {
  height: 36px;
  padding: 0 16px;
  font-size: 0.75rem;
}
.btn--lg {
  height: 52px;
  padding: 0 32px;
  font-size: 0.875rem;
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.input-group label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
}

.input,
.textarea,
.select {
  width: 100%;
  padding: 12px 0;
  font-family: var(--font);
  font-size: 1rem;
  color: var(--text);
  background: transparent;
  border: none;
  border-bottom: 1.5px solid var(--border);
  border-radius: 0;
  outline: none;
  transition: border-color var(--duration-fast) var(--ease);
}
.input::placeholder,
.textarea::placeholder,
.select::placeholder {
  color: var(--text-muted);
}
.input:focus,
.textarea:focus,
.select:focus {
  border-color: var(--text);
}
.input--lg,
.textarea--lg,
.select--lg {
  font-size: 1.125rem;
  padding: 16px 0;
  font-weight: 500;
}
.input--error,
.textarea--error,
.select--error {
  border-color: var(--danger);
}

.textarea {
  min-height: 100px;
  resize: vertical;
  line-height: 1.7;
}

.select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%23737373' viewBox='0 0 16 16'%3E%3Cpath d='M4.646 5.646a.5.5 0 0 1 .708 0L8 8.293l2.646-2.647a.5.5 0 0 1 .708.708l-3 3a.5.5 0 0 1-.708 0l-3-3a.5.5 0 0 1 0-.708z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0 center;
  padding-right: 20px;
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  border-radius: var(--radius-full);
  line-height: 1.4;
}
.badge--primary {
  background: var(--text);
  color: var(--bg);
}
.badge--accent {
  background: var(--accent-muted);
  color: var(--accent);
}
.badge--neutral {
  background: var(--bg-secondary);
  color: var(--text-secondary);
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 8px 20px;
  font-size: 0.8125rem;
  font-weight: 500;
  border-radius: var(--radius-full);
  border: 1.5px solid var(--border);
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease);
}
.tag:hover, .tag--active {
  background: var(--text);
  border-color: var(--text);
  color: var(--bg);
}

.search-input-wrapper {
  position: relative;
}
.search-input-wrapper .search-icon {
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
  width: 20px;
  height: 20px;
}
.search-input-wrapper .input {
  padding-left: 32px;
  border-bottom: 2px solid var(--border);
  font-size: 1.125rem;
}
.search-input-wrapper .input:focus {
  border-color: var(--text);
}
@media (min-width: 768px) {
  .search-input-wrapper .input {
    font-size: 1.25rem;
  }
}
.search-input-wrapper .search-clear {
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
  display: none;
}
.search-input-wrapper .search-clear.visible {
  display: block;
}
.search-input-wrapper .search-clear:hover {
  color: var(--text);
}

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 80px 24px;
  text-align: center;
}
.empty-state__icon {
  width: 48px;
  height: 48px;
  color: var(--text-muted);
  margin-bottom: 24px;
  opacity: 0.3;
}
.empty-state__title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}
.empty-state__text {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.error-message {
  padding: 12px 16px;
  background: var(--danger-muted);
  border-left: 3px solid var(--danger);
  color: var(--danger);
  font-size: 0.875rem;
  font-weight: 500;
  animation: fadeIn var(--duration) var(--ease);
}

.skeleton {
  background: linear-gradient(90deg, var(--gray-100) 25%, var(--gray-50) 50%, var(--gray-100) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-md);
}

@keyframes shimmer {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 64px;
  z-index: var(--z-header);
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  transition: background var(--duration) var(--ease), border-color var(--duration) var(--ease);
}
.header__inner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  height: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}
@media (min-width: 768px) {
  .header__inner {
    padding: 0 48px;
  }
}
.header__search {
  flex: 1 1 auto;
  max-width: 480px;
}
.header__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
  cursor: pointer;
  flex-shrink: 0;
}
.header__logo {
  width: 32px;
  height: 32px;
  background: var(--text);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--bg);
  font-weight: 900;
  font-size: 0.75rem;
  letter-spacing: 0.02em;
}
.header__title {
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  text-transform: uppercase;
  display: none;
}
@media (min-width: 768px) {
  .header__title {
    display: block;
  }
}
.header__title span {
  font-weight: 400;
}
.header__search {
  flex: 1 1 auto;
  max-width: 480px;
}
.header__search .search-input-wrapper .search-icon {
  left: 12px;
}
.header__search .search-input-wrapper .input {
  padding: 8px 12px 8px 36px;
  font-size: 0.8125rem;
  height: 36px;
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  border-bottom-width: 1px;
  background: var(--bg-secondary);
  transition: all var(--duration-fast) var(--ease);
}
.header__search .search-input-wrapper .input:focus {
  border-color: var(--text);
  background: var(--bg);
}
.header__search .search-input-wrapper .input::placeholder {
  font-size: 0.8125rem;
}
.header__search .search-input-wrapper .search-clear {
  right: 8px;
}
.header__nav-mobile {
  display: flex;
  align-items: center;
  gap: 4px;
}
.header__link {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
  border-radius: var(--radius-full);
  transition: all var(--duration-fast) var(--ease);
  cursor: pointer;
  border: none;
  background: none;
  font-family: var(--font);
}
.header__link svg {
  width: 16px;
  height: 16px;
}
.header__link:hover {
  color: var(--text);
}
.header__link--active {
  color: var(--text);
  background: var(--bg-secondary);
}
.header__actions {
  display: flex;
  align-items: center;
  gap: 8px;
  height: 100%;
}
.header__theme-toggle {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  border: none;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease);
}
.header__theme-toggle svg {
  width: 18px;
  height: 18px;
}
.header__theme-toggle:hover {
  color: var(--text);
}

.alphabet-bar {
  position: fixed;
  top: 64px;
  left: 0;
  right: 0;
  z-index: calc(var(--z-header) - 1);
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  transition: background var(--duration) var(--ease), border-color var(--duration) var(--ease);
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}
.alphabet-bar::-webkit-scrollbar {
  display: none;
}
.alphabet-bar__inner {
  display: flex;
  align-items: center;
  gap: 4px;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 12px 24px;
}
@media (min-width: 768px) {
  .alphabet-bar__inner {
    padding: 12px 48px;
    justify-content: center;
    gap: 6px;
  }
}
.alphabet-bar__letter {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 36px;
  height: 36px;
  padding: 0 10px;
  font-size: 0.8125rem;
  font-weight: 700;
  font-family: var(--font);
  text-transform: uppercase;
  letter-spacing: 0.02em;
  color: var(--text-muted);
  background: none;
  border: none;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease);
  border-radius: var(--radius-sm);
}
.alphabet-bar__letter:hover {
  color: var(--text);
  background: var(--bg-secondary);
}
.alphabet-bar__letter--active {
  color: var(--bg);
  background: var(--text);
  font-weight: 900;
}
.alphabet-bar__letter--active:hover {
  color: var(--bg);
  background: var(--text);
  opacity: 0.9;
}

.drawer-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(2px);
  z-index: calc(var(--z-header) + 10);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--duration) var(--ease), visibility var(--duration) var(--ease);
}
.drawer-overlay.open {
  opacity: 1;
  visibility: visible;
}

.nav-drawer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 300px;
  max-width: 85vw;
  background: var(--bg);
  border-left: 1px solid var(--border);
  box-shadow: -10px 0 30px rgba(0, 0, 0, 0.05);
  z-index: calc(var(--z-header) + 11);
  transform: translateX(100%);
  transition: transform var(--duration) var(--ease), background var(--duration) var(--ease);
  display: flex;
  flex-direction: column;
}
.nav-drawer.open {
  transform: translateX(0);
}
.nav-drawer__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border);
}
.nav-drawer__title {
  font-size: 1rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: -0.02em;
  color: var(--text);
}
.nav-drawer__links {
  display: flex;
  flex-direction: column;
  padding: 24px;
  gap: 8px;
}
.nav-drawer__links .header__link {
  justify-content: flex-start;
  padding: 12px 16px;
  font-size: 0.875rem;
}
.nav-drawer__links .header__link svg {
  width: 18px;
  height: 18px;
  margin-right: 8px;
  color: var(--text-muted);
}
.nav-drawer__links .header__link:hover svg, .nav-drawer__links .header__link--active svg {
  color: var(--text);
}

.term-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}
@media (min-width: 768px) {
  .term-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (min-width: 1024px) {
  .term-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.footer {
  border-top: 1px solid var(--border);
  padding: 40px 0;
  margin-top: auto;
}
.footer__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}
@media (min-width: 768px) {
  .footer__inner {
    flex-direction: row;
    justify-content: space-between;
  }
}
.footer__text {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.footer__links {
  display: flex;
  gap: 24px;
}
.footer__links a {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.footer__links a:hover {
  color: var(--text);
}

.filters-bar {
  position: sticky;
  top: 124px;
  z-index: 40;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}
.filters-bar::-webkit-scrollbar {
  display: none;
}
.filters-bar__inner {
  display: flex;
  align-items: center;
  gap: 8px;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 12px 24px;
}
@media (min-width: 768px) {
  .filters-bar__inner {
    padding: 12px 48px;
  }
}
.filters-bar .tag {
  flex-shrink: 0;
}

.results-info {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 24px 0 16px;
}
.results-info__count {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.results-info__count strong {
  color: var(--text);
  font-weight: 700;
}
.results-info__letter {
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text);
  background: var(--bg-secondary);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
}
.results-info__letter:empty {
  display: none;
}

.term-list {
  padding-bottom: 80px;
}
.term-list__section {
  border-bottom: 1px solid var(--border);
}
.term-list__letter {
  padding: 32px 0 8px;
  font-size: 2rem;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: -0.02em;
  color: var(--text);
  user-select: none;
}
@media (min-width: 768px) {
  .term-list__letter {
    font-size: 2.5rem;
  }
}
.term-list__items {
  display: flex;
  flex-direction: column;
}
.term-list__item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 0;
  text-decoration: none;
  color: inherit;
  border-top: 1px solid var(--border);
  transition: all var(--duration-fast) var(--ease);
  cursor: pointer;
}
@media (min-width: 768px) {
  .term-list__item {
    padding: 20px 0;
  }
}
.term-list__item:hover {
  padding-left: 8px;
}
.term-list__item-name {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  flex-shrink: 0;
  min-width: 140px;
}
@media (min-width: 768px) {
  .term-list__item-name {
    font-size: 1.0625rem;
    min-width: 220px;
  }
}
.term-list__item-def {
  flex: 1;
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 1;
  line-clamp: 1;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
@media (min-width: 768px) {
  .term-list__item-def {
    -webkit-line-clamp: 2;
    line-clamp: 2;
  }
}
.term-list__item-arrow {
  flex-shrink: 0;
  color: var(--text-muted);
  opacity: 0;
  transform: translateX(-4px);
  transition: all var(--duration-fast) var(--ease);
}
.term-list__item-arrow svg {
  width: 16px;
  height: 16px;
}
.term-list__item:hover .term-list__item-arrow {
  opacity: 1;
  transform: translateX(0);
}

.term-card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  margin-bottom: 40px;
}
@media (min-width: 768px) {
  .term-card-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (min-width: 1024px) {
  .term-card-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}
.term-card-grid .term-card {
  border: none;
  height: 100%;
}

.term-card {
  background: var(--surface);
  padding: 32px;
  cursor: pointer;
  transition: all var(--duration) var(--ease);
  border: none;
  position: relative;
  overflow: hidden;
}
.term-card:hover {
  background: var(--surface);
  transform: translateY(-8px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}
.term-card__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 12px;
  gap: 8px;
}
.term-card__term {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--text);
}
.term-card__favorite {
  flex-shrink: 0;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  padding: 4px;
  transition: all var(--duration-fast) var(--ease);
  z-index: 2;
}
.term-card__favorite svg {
  width: 18px;
  height: 18px;
}
.term-card__favorite:hover {
  color: var(--text);
  transform: scale(1.15);
}
.term-card__favorite--active {
  color: var(--text);
}
.term-card__category {
  margin-bottom: 16px;
}
.term-card__definition {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  transition: opacity var(--duration) var(--ease);
}
.term-card__preview {
  position: absolute;
  top: 100px;
  left: 32px;
  right: 32px;
  bottom: 80px;
  font-size: 0.8125rem;
  color: var(--text-secondary);
  line-height: 1.6;
  opacity: 0;
  transform: translateY(20px);
  transition: all var(--duration) var(--ease);
  pointer-events: none;
  display: -webkit-box;
  -webkit-line-clamp: 4;
  line-clamp: 4;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.term-card__footer {
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}
.term-card__footer-link {
  font-size: 0.6875rem;
  font-weight: 700;
  color: var(--text);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.term-card__footer-link svg {
  width: 14px;
  height: 14px;
  transition: transform var(--duration-fast) var(--ease);
}
.term-card:hover .term-card__footer-link svg {
  transform: translateX(6px);
}

.detail-page {
  padding: 48px 0 80px;
}
@media (min-width: 768px) {
  .detail-page {
    padding: 80px 0 120px;
  }
}

.detail-back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
  margin-bottom: 48px;
  cursor: pointer;
  background: none;
  border: none;
  font-family: var(--font);
  padding: 8px 0;
  transition: color var(--duration-fast) var(--ease);
}
.detail-back svg {
  width: 14px;
  height: 14px;
}
.detail-back:hover {
  color: var(--text);
}
.detail-back:hover svg {
  transform: translateX(-3px);
}

.detail-header {
  margin-bottom: 48px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--border);
}
.detail-header__top {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}
.detail-header__title {
  font-size: clamp(2rem, 6vw, 3.5rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  text-transform: uppercase;
  line-height: 0.95;
}
.detail-header__actions {
  margin-left: auto;
  display: flex;
  gap: 8px;
}
.detail-header__meta {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.detail-content {
  max-width: var(--max-narrow);
}
.detail-content__section {
  margin-bottom: 40px;
}
.detail-content__label {
  font-size: 0.6875rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 12px;
}
.detail-content__text {
  font-size: 1.0625rem;
  color: var(--text-secondary);
  line-height: 1.8;
}
.detail-content__markdown {
  font-size: 1.0625rem;
  color: var(--text-secondary);
  line-height: 1.8;
}
.detail-content__markdown h1, .detail-content__markdown h2, .detail-content__markdown h3, .detail-content__markdown h4 {
  color: var(--text);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin: 32px 0 12px;
}
.detail-content__markdown h1:first-child, .detail-content__markdown h2:first-child, .detail-content__markdown h3:first-child, .detail-content__markdown h4:first-child {
  margin-top: 0;
}
.detail-content__markdown h1 {
  font-size: 1.5rem;
}
.detail-content__markdown h2 {
  font-size: 1.25rem;
}
.detail-content__markdown h3 {
  font-size: 1.0625rem;
}
.detail-content__markdown p {
  margin: 0 0 16px;
}
.detail-content__markdown p:last-child {
  margin-bottom: 0;
}
.detail-content__markdown strong {
  color: var(--text);
  font-weight: 700;
}
.detail-content__markdown em {
  font-style: italic;
}
.detail-content__markdown a {
  color: var(--text);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.detail-content__markdown a:hover {
  opacity: 0.7;
}
.detail-content__markdown code {
  font-family: "Courier New", monospace;
  font-size: 0.875em;
  background: var(--bg-secondary);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--text);
}
.detail-content__markdown pre {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  padding: 20px 24px;
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin: 0 0 16px;
}
.detail-content__markdown pre code {
  background: none;
  padding: 0;
  font-size: 0.875rem;
}
.detail-content__markdown ul, .detail-content__markdown ol {
  padding-left: 24px;
  margin: 0 0 16px;
}
.detail-content__markdown ul li, .detail-content__markdown ol li {
  margin-bottom: 6px;
}
.detail-content__markdown blockquote {
  border-left: 3px solid var(--border);
  padding: 4px 0 4px 20px;
  margin: 0 0 16px;
  color: var(--text-muted);
  font-style: italic;
}
.detail-content__markdown hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 24px 0;
}

.detail-related {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.detail-related__item {
  padding: 8px 20px;
  font-size: 0.8125rem;
  font-weight: 600;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease);
}
.detail-related__item:hover {
  background: var(--text);
  border-color: var(--text);
  color: var(--bg);
}

.login-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 64px);
  padding: 24px;
}

.login-card {
  width: 100%;
  max-width: 380px;
}
.login-card__header {
  text-align: left;
  margin-bottom: 40px;
}
.login-card__icon {
  width: 48px;
  height: 48px;
  background: var(--text);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
}
.login-card__icon svg {
  width: 24px;
  height: 24px;
  color: var(--bg);
}
.login-card__title {
  font-size: 1.5rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}
.login-card__subtitle {
  font-size: 0.875rem;
  color: var(--text-muted);
}
.login-card__form {
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.login-card__submit {
  margin-top: 8px;
}
.login-card__footer {
  margin-top: 32px;
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.login-card__footer a {
  color: var(--text);
  font-weight: 600;
}
.login-card__footer a:hover {
  text-decoration: underline;
}

.admin-page {
  padding: 48px 0 80px;
}
@media (min-width: 768px) {
  .admin-page {
    padding: 80px 0 120px;
  }
}

.admin-header {
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin-bottom: 48px;
}
@media (min-width: 768px) {
  .admin-header {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}
.admin-header__title {
  font-size: 1.5rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: -0.02em;
}
.admin-header__actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.admin-table-wrapper {
  overflow-x: auto;
  border: 1px solid var(--border);
}

.admin-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}
.admin-table th,
.admin-table td {
  padding: 16px 20px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}
.admin-table th {
  font-weight: 700;
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
  background: var(--bg-secondary);
}
.admin-table tbody tr {
  transition: background var(--duration-fast) var(--ease);
}
.admin-table tbody tr:hover {
  background: var(--bg-secondary);
}
.admin-table tbody tr:last-child td {
  border-bottom: none;
}
.admin-table__term {
  font-weight: 600;
  color: var(--text);
}
.admin-table__definition {
  color: var(--text-secondary);
  max-width: 300px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.admin-table__actions {
  display: flex;
  gap: 8px;
  white-space: nowrap;
}

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  animation: fadeIn var(--duration-fast) var(--ease);
}

.modal {
  width: 100%;
  max-width: 500px;
  max-height: 90vh;
  overflow-y: auto;
  background: var(--surface);
  border: 1px solid var(--border);
  animation: scaleIn var(--duration) var(--ease);
}
.modal__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px;
  border-bottom: 1px solid var(--border);
}
.modal__title {
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}
.modal__close {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
}
.modal__close svg {
  width: 18px;
  height: 18px;
}
.modal__close:hover {
  color: var(--text);
}
.modal__body {
  padding: 24px;
}
.modal__body .input-group + .input-group {
  margin-top: 20px;
}
.modal__footer {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  padding: 16px 24px;
  border-top: 1px solid var(--border);
}

.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
}
@media (max-width: 767px) {
  .toast-container {
    left: 24px;
    right: 24px;
  }
}

.toast {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 20px;
  background: var(--text);
  color: var(--bg);
  font-size: 0.8125rem;
  font-weight: 500;
  pointer-events: auto;
  animation: slideUp var(--duration) var(--ease);
  min-width: 240px;
}
.toast--success {
  border-left: 3px solid var(--accent);
}
.toast--error {
  border-left: 3px solid var(--danger);
}
.toast--warning {
  border-left: 3px solid #f59e0b;
}
.toast__close {
  margin-left: auto;
  background: none;
  border: none;
  color: inherit;
  opacity: 0.5;
  cursor: pointer;
}
.toast__close:hover {
  opacity: 1;
}

.term-editor-overlay {
  position: fixed;
  inset: 0;
  background: var(--bg);
  z-index: calc(var(--z-modal) + 10);
  display: flex;
  flex-direction: column;
  animation: fadeIn var(--duration-fast) var(--ease);
}
.term-editor-overlay__header {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 24px;
  height: 64px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.term-editor-overlay__header .term-editor__title {
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  flex: 1;
}
.term-editor-overlay__header .term-editor__actions {
  display: flex;
  gap: 8px;
}
.term-editor-overlay__body {
  display: grid;
  grid-template-columns: 1fr;
  flex: 1;
  overflow: hidden;
}
@media (min-width: 768px) {
  .term-editor-overlay__body {
    grid-template-columns: 280px 1fr 1fr;
  }
}
.term-editor-overlay__meta {
  border-right: 1px solid var(--border);
  padding: 32px 24px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 24px;
}
@media (min-width: 768px) {
  .term-editor-overlay__meta {
    display: flex;
  }
}
.term-editor-overlay__editor {
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--border);
  overflow: hidden;
}
.term-editor-overlay__preview {
  overflow-y: auto;
  padding: 32px 40px;
  display: none;
}
@media (min-width: 768px) {
  .term-editor-overlay__preview {
    display: block;
  }
}
.term-editor-overlay__preview h1, .term-editor-overlay__preview h2, .term-editor-overlay__preview h3, .term-editor-overlay__preview h4 {
  font-weight: 800;
  letter-spacing: -0.02em;
  margin: 0 0 12px;
}
.term-editor-overlay__preview p {
  margin: 0 0 16px;
  line-height: 1.75;
  color: var(--text-secondary);
}
.term-editor-overlay__preview code {
  font-family: monospace;
  background: var(--bg-secondary);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.875em;
}
.term-editor-overlay__preview pre {
  background: var(--bg-secondary);
  padding: 16px;
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin: 0 0 16px;
}
.term-editor-overlay__preview pre code {
  background: none;
  padding: 0;
}
.term-editor-overlay__preview ul, .term-editor-overlay__preview ol {
  padding-left: 24px;
  margin: 0 0 16px;
  line-height: 1.75;
  color: var(--text-secondary);
}
.term-editor-overlay__preview blockquote {
  border-left: 3px solid var(--border);
  padding-left: 16px;
  color: var(--text-muted);
  margin: 0 0 16px;
}
.term-editor-overlay__preview strong {
  color: var(--text);
}
.term-editor-overlay__pane-label {
  padding: 12px 24px;
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.term-editor-overlay__textarea {
  flex: 1;
  width: 100%;
  padding: 24px;
  font-family: "Courier New", monospace;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  border: none;
  outline: none;
  resize: none;
  overflow-y: auto;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}
@keyframes fadeOut {
  from {
    opacity: 1;
  }
  to {
    opacity: 0;
  }
}
@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.97);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}
@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}
.animate-fade-in {
  animation: fadeIn var(--duration) var(--ease) both;
}

.stagger-children > * {
  animation: slideUp 400ms var(--ease) both;
}
.stagger-children > *:nth-child(1) {
  animation-delay: 0ms;
}
.stagger-children > *:nth-child(2) {
  animation-delay: 40ms;
}
.stagger-children > *:nth-child(3) {
  animation-delay: 80ms;
}
.stagger-children > *:nth-child(4) {
  animation-delay: 120ms;
}
.stagger-children > *:nth-child(5) {
  animation-delay: 160ms;
}
.stagger-children > *:nth-child(6) {
  animation-delay: 200ms;
}
.stagger-children > *:nth-child(7) {
  animation-delay: 240ms;
}
.stagger-children > *:nth-child(8) {
  animation-delay: 280ms;
}
.stagger-children > *:nth-child(9) {
  animation-delay: 320ms;
}
.stagger-children > *:nth-child(10) {
  animation-delay: 360ms;
}
.stagger-children > *:nth-child(11) {
  animation-delay: 400ms;
}
.stagger-children > *:nth-child(12) {
  animation-delay: 440ms;
}

.spinner {
  width: 20px;
  height: 20px;
  border: 2px solid var(--border);
  border-top-color: var(--text);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

.page-enter {
  animation: fadeIn 300ms var(--ease) both;
}

[data-theme=dark] {
  --bg: #0a0a0a;
  --bg-secondary: #141414;
  --surface: #141414;
  --text: #fafafa;
  --text-secondary: #a3a3a3;
  --text-muted: #525252;
  --border: #262626;
  --border-hover: #404040;
  --shadow-sm: none;
  --shadow-md: none;
  --shadow-lg: none;
  color-scheme: dark;
}
[data-theme=dark] ::-webkit-scrollbar-thumb {
  background: var(--gray-700);
}
[data-theme=dark] ::selection {
  background: var(--white);
  color: var(--black);
}