:root {
  --fuci-bg: #fafafa;
  --fuci-fg: #1a1a1a;
  --fuci-border: #e5e5e5;
  --fuci-muted-bg: #f7f7f7;
  --fuci-muted-text: #6b7280;
  --fuci-card-border: #e5e5e5;
  --fuci-radius-lg: 0.75rem;
  --fuci-spacing-lg: 1.5rem;
  --fuci-shadow: rgba(0, 0, 0, 0.02);
  --fuci-shadow-hover: rgba(0, 0, 0, 0.05);
  --fuci-transition-base: 0.2s;
  --fuci-transition-slow: 0.25s;
}

@media (prefers-color-scheme: dark) {
  :root {
    --fuci-bg: #0d0d0d;
    --fuci-fg: #e5e5e5;
    --fuci-border: #1f1f1f;
    --fuci-muted-bg: #141414;
    --fuci-muted-text: #9ca3af;
    --fuci-card-border: #1f1f1f;
    --fuci-shadow: rgba(0, 0, 0, 0.3);
    --fuci-shadow-hover: rgba(0, 0, 0, 0.4);
  }
}

/* Respect prefers-reduced-motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms;
    animation-iteration-count: 1;
    transition-duration: 0.01ms;
  }

  /* 翻转卡片即使 0.01ms 也有残影，这里彻底禁用过渡 */
  .fuci-flip-inner {
    transition: none;
  }
}

html {
  scroll-behavior: smooth;
}

body {
  background: var(--fuci-bg);
  color: var(--fuci-fg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Skip to content link for keyboard navigation */
.skip-link {
  position: absolute;
  top: -100%;
  left: 0;
  background: var(--bs-primary);
  color: white;
  padding: 0.5rem 1rem;
  text-decoration: none;
  z-index: 9999;
  border-radius: 0 0 0.25rem 0;
}

.skip-link:focus {
  top: 0;
}

.fuci-main {
  max-width: 1400px;
  margin: 0 auto;
  padding: 3rem 1.5rem;
}

.fuci-footer {
  text-align: center;
  padding: 2rem 1.5rem;
  color: var(--fuci-muted-text);
  border-top: 1px solid var(--fuci-border);
  font-size: 1rem;
  margin-top: 4rem;
}

.fuci-footer a {
  transition: color var(--fuci-transition-base);
}

.fuci-footer a:hover {
  color: var(--bs-primary);
}

.fuci-card {
  background: var(--fuci-bg);
  border: 1px solid var(--fuci-card-border);
  border-radius: var(--fuci-radius-lg);
  padding: 1.5rem;
  transition:
    border-color var(--fuci-transition-base),
    box-shadow var(--fuci-transition-base);
  display: flex;
  flex-direction: column;
}

.fuci-card:hover {
  border-color: var(--fuci-border);
  box-shadow: 0 4px 16px var(--fuci-shadow-hover);
}

.fuci-empty-state {
  text-align: center;
  padding: 5rem 2rem;
  color: var(--fuci-muted-text);
}

.fuci-empty-state h4 {
  font-weight: 400;
  margin-bottom: 1rem;
  letter-spacing: -0.01em;
}

.fuci-empty-state p {
  margin-bottom: 1.5rem;
  font-size: 1rem;
}

/* Template preview */
.template-preview {
  font-family: var(--bs-font-monospace);
  font-size: 1rem;
  color: var(--fuci-muted-text);
  background: var(--fuci-muted-bg);
  padding: 0.75rem 1rem;
  border-radius: 0.5rem;
  border: 1px solid var(--fuci-border);
  white-space: pre-wrap;
  word-break: break-word;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.01em;
}

/* Markdown content styling */
.markdown-content h1,
.markdown-content h2,
.markdown-content h3,
.markdown-content h4,
.markdown-content h5,
.markdown-content h6 {
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
  font-weight: 500;
  letter-spacing: -0.02em;
}

.markdown-content h1 {
  font-size: 1.5rem;
}
.markdown-content h2 {
  font-size: 1.25rem;
}
.markdown-content h3 {
  font-size: 1.125rem;
}

.markdown-content p {
  margin-bottom: 1rem;
  line-height: 1.7;
}

.markdown-content ul,
.markdown-content ol {
  margin-bottom: 0.75rem;
  padding-left: 1.5rem;
}

.markdown-content li {
  margin-bottom: 0.25rem;
}

.markdown-content code {
  font-family: var(--bs-font-monospace);
  font-size: 1em;
  background: var(--fuci-muted-bg);
  padding: 0.125rem 0.375rem;
  border-radius: 0.25rem;
  font-variant-numeric: tabular-nums;
}

.markdown-content pre {
  font-family: var(--bs-font-monospace);
  background: var(--fuci-muted-bg);
  padding: 1rem;
  border-radius: 0.5rem;
  overflow-x: auto;
  margin-bottom: 1rem;
  font-size: 1em;
}

.markdown-content pre code {
  background: none;
  padding: 0;
}

.markdown-content blockquote {
  border-left: 3px solid var(--fuci-border);
  padding-left: 1rem;
  margin-left: 0;
  margin-bottom: 1rem;
  color: var(--fuci-muted-text);
  font-style: italic;
}

.markdown-content table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 0.75rem;
}

.markdown-content th,
.markdown-content td {
  border: 1px solid var(--fuci-border);
  padding: 0.5rem;
  text-align: left;
}

.markdown-content th {
  background: var(--fuci-muted-bg);
  font-weight: 600;
}

.markdown-content a {
  color: var(--fuci-fg);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
  opacity: 0.8;
}

.markdown-content a:hover {
  text-decoration-thickness: 2px;
  opacity: 1;
}

.markdown-content strong {
  font-weight: 500;
}

.markdown-content em {
  font-style: italic;
}

.markdown-content hr {
  border: none;
  border-top: 1px solid var(--fuci-border);
  margin: 1rem 0;
}

/* Copy button styling */
.copy-btn {
  transition:
    opacity var(--fuci-transition-base),
    background-color var(--fuci-transition-base);
  z-index: 10;
  opacity: 0.7;
}

.copy-btn:hover,
.copy-btn.hover-opacity-100:hover {
  opacity: 1;
}

/* Result card styling */
.fuci-result-card {
  border: 1px solid var(--fuci-border);
  border-radius: var(--fuci-radius-lg);
  background: var(--fuci-bg);
  transition:
    border-color var(--fuci-transition-base),
    box-shadow var(--fuci-transition-base);
  perspective: 1000px;
}

.fuci-result-card:hover {
  border-color: var(--fuci-border);
  box-shadow: 0 2px 8px var(--fuci-shadow-hover);
}

.fuci-result-card .card-body {
  padding: var(--fuci-spacing-lg);
}

/* Card flip animation — CSS Grid same-cell stacking */
.fuci-flip-inner {
  display: grid;
  width: 100%;
  height: 100%;
  transition: transform 0.6s;
  transform-style: preserve-3d;
}

.fuci-flip-inner.flipped {
  transform: rotateY(180deg);
}

.fuci-flip-front,
.fuci-flip-back {
  grid-area: 1 / 1;
  backface-visibility: hidden;
  display: flex;
  flex-direction: column;
  position: relative;
}

.fuci-flip-back {
  transform: rotateY(180deg);
}

.fuci-flip-front .card-body,
.fuci-flip-back .card-body {
  flex: 1;
  overflow-y: auto;
}

.fuci-flip-front .card-footer,
.fuci-flip-back .card-footer {
  flex-shrink: 0;
}

.fuci-copy-btn {
  background: var(--fuci-muted-bg);
  border: 1px solid var(--fuci-border);
  color: var(--fuci-fg);
  border-radius: 0.5rem;
}

/* 按钮入文档流占顶行：绝对定位悬浮时满行长词条首行右侧被按钮盖住（实测遮挡）。
padding 左右与 card-body 对齐，顶部 0.5rem 对齐原 m-2 悬浮边距 */
.fuci-card-actions {
  padding: 0.5rem var(--fuci-spacing-lg) 0;
}

.fuci-copy-btn:hover {
  background: var(--fuci-bg);
}

/* 翻转后隐藏前脸的复制按钮，避免 position:absolute 在移动端穿透 */
.fuci-flip-inner.flipped .fuci-flip-front .copy-btn {
  display: none;
}

/* Ensure copy button is visible on all cards */
.card:hover .copy-btn {
  opacity: 1;
}

/* Toast styling */
.fuci-toast {
  background-color: var(--fuci-fg);
  color: var(--fuci-bg);
}

.fuci-toast .btn-close-white {
  filter: invert(1) grayscale(100%) brightness(200%);
}

/* High-density layout for admin pages */
.admin-dicts {
  padding: 1.5rem 1.5rem;
}

.admin-dicts .fuci-card {
  padding: 0;
}

.admin-dicts .card-header {
  padding: 0.5rem 0.75rem;
  font-size: 1rem;
}

.admin-dicts .card-body {
  padding: 0.75rem;
}

.admin-dicts .list-group-item {
  padding: 0.4rem 0.75rem;
  font-size: 1rem;
}

.admin-dicts .list-group-item .badge {
  font-size: 1rem;
  padding: 0.2rem 0.5rem;
}

.admin-dicts .form-control {
  font-size: 1rem;
  padding: 0.375rem 0.625rem;
}

.admin-dicts .btn {
  font-size: 1rem;
  padding: 0.375rem 0.625rem;
}

.admin-dicts .fuci-empty-state {
  padding: 3rem 2rem;
}

.admin-dicts .fuci-empty-state h4 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
}

.admin-dicts .fuci-empty-state p {
  font-size: 1rem;
  margin-bottom: 0;
}

/* Word grid in admin dicts */
/* 词条网格：模板只挂 .word-grid，列数在这里调整 */
.word-grid {
  --bs-columns: 3;
}

@media (min-width: 768px) {
  .word-grid {
    --bs-columns: 4;
  }
}

@media (min-width: 1200px) {
  .word-grid {
    --bs-columns: 6;
  }
}

/* Tag chips */
.tag-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.3125rem 0.625rem;
  font-size: 1rem;
  border: 1px solid var(--fuci-border);
  border-radius: 100px;
  background: var(--fuci-muted-bg);
  color: var(--fuci-muted-text);
  cursor: pointer;
  transition: all var(--fuci-transition-base);
  user-select: none;
}

.tag-chip:hover {
  border-color: var(--bs-primary);
  color: var(--fuci-fg);
}

.tag-chip.active {
  background: var(--bs-primary);
  border-color: var(--bs-primary);
  color: #fff;
}

.tag-count {
  font-size: 1rem;
  opacity: 0.6;
}

.tag-chip.active .tag-count {
  opacity: 0.7;
}

/* Small tag chip (used on rule cards) */
.tag-chip-sm {
  padding: 0.125rem 0.5rem;
  font-size: 1rem;
  cursor: default;
}

.tag-chip-sm .tag-chip-remove {
  background: none;
  border: none;
  padding: 0;
  font-size: 1rem;
  line-height: 1;
  color: inherit;
  opacity: 0.5;
  cursor: pointer;
}

.tag-chip-sm .tag-chip-remove:hover {
  opacity: 1;
}

/* Tag badge on rule cards */
.tag-badge {
  background: var(--fuci-muted-bg);
  color: var(--fuci-muted-text);
  border: 1px solid var(--fuci-border);
  font-weight: 400;
  cursor: pointer;
  transition: all var(--fuci-transition-base);
}

.tag-badge:hover {
  border-color: var(--bs-primary);
  color: var(--fuci-fg);
}

/* Tag chips input area */
.tag-chips-input {
  background: var(--fuci-bg);
  border: 1px solid var(--fuci-border);
  border-radius: var(--bs-border-radius-md, 0.375rem);
  padding: 0.5rem;
}

.tag-chips-input .tag-input {
  border: none;
  background: none;
  padding: 0.25rem 0;
  outline: none;
  box-shadow: none;
  width: 100%;
}

.tag-chips-input .tag-input::placeholder {
  color: var(--fuci-muted-text);
  font-size: 1rem;
}

@media (prefers-color-scheme: dark) {
  .tag-chip,
  .tag-chip-sm {
    background: var(--fuci-bg);
  }

  .tag-chips-input {
    background: var(--fuci-muted-bg);
  }
}