:root {
  --paper: #ffffff;
  --paper-soft: #f8fafc;
  --paper-deep: #f1f5f9;
  --ink: #0f172a;
  --muted: #64748b;
  --line: rgba(0, 0, 0, 0.08);
  --line-strong: rgba(0, 0, 0, 0.15);
  --accent: #2563eb;
  --accent-soft: rgba(37, 99, 235, 0.1);
  --accent-green: #059669;
  --accent-purple: #2563eb;
  --shadow: 0 8px 30px rgba(0, 0, 0, 0.04);
  --radius-xl: 24px;
  --radius-lg: 16px;
  --radius-md: 12px;
  --container: min(1280px, calc(100% - 32px));
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper-soft);
  font-family: ui-sans-serif, -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  line-height: 1.65;
  min-height: 100vh;
}

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

button,
input {
  font: inherit;
}

img {
  display: block;
  max-width: 100%;
}

.container {
  width: var(--container);
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.site-header.is-collapsed {
  transform: translateY(-100%);
  opacity: 0;
  pointer-events: none;
}

.header-toggle-btn {
  position: fixed;
  top: 12px;
  left: 50%;
  transform: translateX(-50%) translateY(-60px);
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 20px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
  transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.35s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.2s ease;
  opacity: 0;
  pointer-events: none;
  white-space: nowrap;
}

.header-toggle-btn.is-visible {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
  pointer-events: auto;
}

.header-toggle-btn:hover {
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.12);
  color: var(--ink);
}

.header-toggle-btn svg {
  width: 16px;
  height: 16px;
}

.site-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px 0 10px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  transition: transform 0.2s ease;
}

.brand:hover {
  transform: scale(1.02);
}

.brand-mark {
  display: inline-flex;
  height: 42px;
  width: 42px;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  background: var(--ink);
  color: #fff;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.brand-name {
  margin: 0;
  font-family: 'Baskerville Old Face', 'Palatino Linotype', 'Book Antiqua', Georgia, 'STSong', 'Songti SC', serif;
  font-size: 1.1rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.brand-meta {
  margin-top: 2px;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav-link {
  border-radius: 999px;
  padding: 10px 16px;
  color: var(--muted);
  font-size: 0.94rem;
  font-weight: 500;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
}

.nav-link:hover,
.nav-link.is-active {
  background: var(--paper-deep);
  color: var(--ink);
  box-shadow: none;
}

.global-search {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  padding-bottom: 24px;
}

.search-field {
  position: relative;
}

.search-field svg {
  position: absolute;
  left: 20px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--muted);
  transition: color 0.2s ease;
}

.search-input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--paper);
  padding: 18px 24px 18px 52px;
  color: var(--ink);
  font-size: 1.05rem;
  outline: none;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: inset 0 2px 4px rgba(0,0,0,0.02);
}

.search-input:focus {
  border-color: rgba(37, 99, 235, 0.4);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1);
  background: var(--paper);
}

.search-input:focus + svg {
  color: var(--accent);
}

.search-submit,
.button-primary,
.button-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  border: 1px solid transparent;
  border-radius: 20px;
  padding: 0 24px;
  min-height: 58px;
  cursor: pointer;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.search-submit,
.button-primary {
  background: var(--ink);
  color: #fff;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.1);
}

.search-submit:hover,
.button-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
  background: #000;
}

.button-secondary {
  border-color: var(--line);
  background: var(--paper);
  color: var(--ink);
  backdrop-filter: blur(8px);
}

.button-secondary:hover {
  transform: translateY(-2px);
  background: var(--paper-soft);
  border-color: var(--line-strong);
}

.search-note {
  margin-top: -12px;
  padding-bottom: 24px;
  color: var(--muted);
  font-size: 0.95rem;
}

.search-toolbar {
  display: grid;
  gap: 16px;
  margin-top: 24px;
}

.search-hint {
  color: var(--muted);
  font-size: 0.92rem;
}

.site-main {
  padding: 30px 0 80px;
}

.surface {
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
}

.surface-soft {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--paper-soft);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(320px, 0.85fr);
  gap: 32px;
  padding: 48px;
}

.eyebrow {
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.25em;
  text-transform: uppercase;
}

.page-title,
.hero-title,
.section-title,
.card-title,
.detail-title {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  letter-spacing: -0.04em;
  font-weight: 800;
}

.hero-title {
  margin-top: 16px;
  font-size: clamp(2.5rem, 5vw, 4.8rem);
  line-height: 1.04;
}

.page-title {
  margin-top: 12px;
  font-size: clamp(2.1rem, 4vw, 3.5rem);
  line-height: 1.1;
}

.section-title {
  font-size: clamp(1.8rem, 3vw, 2.7rem);
  line-height: 1.14;
}

.card-title {
  font-size: 1.35rem;
  line-height: 1.28;
}

.detail-title {
  margin-top: 12px;
  font-size: clamp(2rem, 4vw, 3.3rem);
  line-height: 1.12;
}

.lead,
.page-lead {
  color: var(--muted);
}

.lead {
  margin-top: 18px;
  max-width: 60ch;
  font-size: 1.02rem;
  line-height: 1.9;
}

.page-lead {
  margin-top: 12px;
  max-width: 68ch;
  font-size: 1rem;
  line-height: 1.85;
}

.section {
  margin-top: 56px;
}

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 18px;
}

.section-text {
  color: var(--muted);
  max-width: 62ch;
  margin-top: 10px;
  font-size: 0.98rem;
}

.stat-row,
.badge-row,
.chip-cloud,
.action-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.stat-row {
  margin-top: 26px;
}

.stat-pill,
.badge,
.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #ffffff;
  transition: all 0.2s ease;
}

.stat-pill {
  padding: 12px 18px;
}

.stat-number {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--ink);
}

.stat-label,
.badge {
  color: var(--muted);
  font-size: 0.95rem;
}

.chip,
.badge {
  padding: 10px 18px;
  font-weight: 500;
}

.badge {
  background: var(--paper-soft);
  color: var(--muted);
  border: 1px solid var(--line);
}

.chip:hover {
  background: var(--paper-soft);
  border-color: var(--line-strong);
  transform: translateY(-1px);
}

.chip.is-active {
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
  box-shadow: 0 0 12px rgba(37, 99, 235, 0.2);
}

.chip.is-active .chip-count {
  color: rgba(255, 255, 255, 0.78);
}

.chip-count {
  color: var(--muted);
  font-size: 0.82rem;
  display: none;
}

.quick-grid,
.card-grid,
.collection-grid,
.category-grid,
.author-grid {
  display: grid;
  gap: 18px;
}

.quick-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.card-grid,
.collection-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.category-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.author-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.directory-card,
.collection-card,
.item-card,
.author-card,
.detail-block,
.meta-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--paper);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.directory-card,
.collection-card,
.author-card,
.meta-card,
.detail-block {
  padding: 26px;
}

.directory-card:hover,
.collection-card:hover,
.item-card:hover,
.author-card:hover {
  transform: translateY(-4px);
  background: var(--paper);
  border-color: var(--line-strong);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.08);
}

.item-card {
  overflow: hidden;
}

.item-image {
  aspect-ratio: 4 / 3;
  object-fit: cover;
  background: var(--paper-deep);
  border-bottom: 1px solid var(--line);
}

.item-body {
  padding: 18px;
}

.item-meta {
  margin-top: 12px;
  color: var(--muted);
  font-size: 0.92rem;
}

.item-summary {
  margin-top: 12px;
  color: var(--muted);
  font-size: 0.96rem;
  line-height: 1.8;
  display: -webkit-box;
  -webkit-line-clamp: 5;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.nanobanna-toolbar {
  padding: 22px;
}

.nanobanna-toolbar-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 14px;
  align-items: center;
}

.nanobanna-filter-stack {
  display: grid;
  gap: 18px;
  margin-top: 18px;
}

.nanobanna-filter-group .chip {
  cursor: pointer;
}

.search-card {
  position: relative;
}

.search-card-title mark,
.search-fragment-text mark,
.search-mark {
  border-radius: 6px;
  background: var(--accent-soft);
  color: var(--accent);
  padding: 0 6px;
}

.search-fragment {
  margin-top: 14px;
  border-radius: 12px;
  border: 1px dashed var(--line-strong);
  background: var(--paper-soft);
  padding: 16px;
}

.search-fragment-text {
  margin-top: 8px;
  color: var(--ink);
  font-size: 0.95rem;
  line-height: 1.8;
}

.detail-hero {
  position: relative;
  overflow: hidden;
  padding: 48px;
  background: var(--paper);
  border-radius: var(--radius-xl);
  border: 1px solid var(--line);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
}

.metric-grid,
.preview-strip,
.detail-nav {
  display: grid;
  gap: 14px;
}

.metric-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-top: 24px;
}

.metric-tile,
.preview-card,
.media-card,
.detail-nav-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--paper);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.metric-tile {
  padding: 20px;
}

.preview-strip {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-top: 24px;
}

.preview-card,
.detail-nav-card {
  display: block;
}

.preview-card:hover,
.detail-nav-card:hover {
  transform: translateY(-4px);
  background: var(--paper);
  border-color: var(--line-strong);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.08);
}

.preview-card {
  overflow: hidden;
}

.preview-image {
  aspect-ratio: 4 / 3;
  object-fit: cover;
  background: var(--paper-deep);
  border-bottom: 1px solid var(--line);
}

.preview-copy {
  padding: 14px 16px 16px;
}

.split-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 24px;
}

.sticky-side {
  position: sticky;
  top: 140px;
  align-self: start;
}

.detail-stack {
  display: grid;
  gap: 18px;
}

.image-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.single-media {
  display: grid;
  gap: 16px;
  max-width: 440px;
}

.media-card {
  overflow: hidden;
}

.media-link {
  display: block;
}

.media-caption {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 18px;
}

.media-action {
  min-height: 44px;
}

.prompt-block {
  overflow: hidden;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: var(--paper-soft);
  color: var(--ink);
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.02);
}

.prompt-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 20px;
  border-bottom: 1px solid var(--line);
  background: var(--paper);
}

.prompt-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: 0.02em;
}

.copy-button {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--paper);
  padding: 8px 16px;
  color: var(--ink);
  cursor: pointer;
  font-weight: 500;
  transition: all 0.2s ease;
}

.copy-button:hover {
  background: var(--paper-deep);
  border-color: var(--line-strong);
  transform: translateY(-1px);
}

.prompt-summary {
  padding: 18px 18px 0;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.78;
}

.prompt-outline {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 14px 18px 0;
}

.prompt-outline .chip {
  border-color: var(--line);
  background: var(--paper);
  color: var(--ink);
}

.prompt-body {
  margin: 0;
  padding: 18px;
  white-space: pre-wrap;
  font-family: ui-monospace, 'SFMono-Regular', Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', monospace;
  font-size: 13px;
  line-height: 1.85;
  overflow: auto;
}

.prompt-body.is-structured {
  margin-top: 14px;
  border-top: 1px solid var(--line);
  background: var(--paper);
}

.meta-list {
  display: grid;
  gap: 12px;
}

.meta-label {
  color: var(--muted);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.meta-value {
  margin-top: 8px;
  font-size: 0.96rem;
  line-height: 1.7;
}

.rich-text {
  margin-top: 10px;
  white-space: pre-wrap;
}

.list-stack {
  display: grid;
  gap: 12px;
}

.empty-state {
  padding: 32px;
  text-align: center;
  color: var(--muted);
}

.load-more-wrap {
  display: flex;
  justify-content: center;
  margin-top: 22px;
}

.pager {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.pager-link,
.pager-gap {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
  padding: 0 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
  font-size: 0.94rem;
  font-weight: 700;
  transition: all 0.2s ease;
  backdrop-filter: blur(8px);
}

.pager-link:hover {
  background: var(--paper-soft);
  border-color: var(--line-strong);
  transform: translateY(-2px);
}

.pager-link.is-current {
  border-color: transparent;
  background: var(--ink);
  color: #fff;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.pager-gap {
  min-width: auto;
  padding: 0 6px;
  border: 0;
  background: transparent;
  color: var(--muted);
  box-shadow: none;
  backdrop-filter: none;
}

.search-sentinel {
  height: 1px;
}

.detail-nav {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.detail-nav-card {
  padding: 20px;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 40px 0 60px;
  color: var(--muted);
  background: var(--paper-soft);
}

.footer-grid {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 32px;
  transform: translateX(-50%);
  z-index: 60;
  border-radius: 999px;
  background: var(--ink);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  color: var(--paper);
  padding: 12px 24px;
  font-size: 0.95rem;
  font-weight: 500;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15), inset 0 0 0 1px rgba(255, 255, 255, 0.1);
  animation: toast-slide-up 0.3s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes toast-slide-up {
  from { opacity: 0; transform: translate(-50%, 20px); }
  to { opacity: 1; transform: translate(-50%, 0); }
}

.spin {
  animation: spin 1.2s linear infinite;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.hidden {
  display: none !important;
}

.filter-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.filter-tab {
  font-size: 0.8rem;
  font-weight: 500;
  padding: 6px 16px;
  border-radius: 999px;
  background: var(--paper);
  border: 1px solid var(--line);
  color: var(--muted);
  cursor: pointer;
  transition: all 0.2s ease;
}

.filter-tab:hover {
  background: var(--paper-deep);
  color: var(--ink);
}

.filter-tab.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #ffffff;
}

@media (max-width: 1120px) {
  .hero-grid,
  .split-layout {
    grid-template-columns: 1fr;
  }

  .sticky-side {
    position: static;
  }

  .quick-grid,
  .card-grid,
  .collection-grid,
  .category-grid,
  .author-grid,
  .image-grid,
  .metric-grid,
  .preview-strip,
  .detail-nav {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 780px) {
  :root {
    --container: min(100% - 24px, 100%);
  }

  .site-topbar,
  .section-head {
    flex-direction: column;
    align-items: flex-start;
  }

  .global-search {
    grid-template-columns: 1fr;
  }

  .nanobanna-toolbar-grid {
    grid-template-columns: 1fr;
  }

  .hero-grid,
  .quick-grid,
  .card-grid,
  .collection-grid,
  .category-grid,
  .author-grid,
  .image-grid,
  .metric-grid,
  .preview-strip,
  .detail-nav {
    grid-template-columns: 1fr;
  }

  .hero-grid {
    padding: 24px;
  }

  .detail-hero {
    padding: 24px;
  }

  .media-caption {
    flex-direction: column;
    align-items: flex-start;
  }

  .header-toggle-btn {
    padding: 6px 14px;
    font-size: 0.78rem;
    gap: 4px;
  }

  .header-toggle-btn svg {
    width: 14px;
    height: 14px;
  }
}