:root {
  --font-body: "TsangerJinKai02", "STKaiti", "KaiTi", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", Consolas, Monaco, "Courier New", Courier, monospace;
  --theme-bg: #fff;
  --theme-bg-soft: #f7f7f7;
  --theme-accent: #a67c52;
  --theme-text: #262626;
  --theme-text-light: #6f6f6f;
  --theme-divider: #e6e6e6;
  --theme-shadow: 0 8px 16px -2px rgb(0 0 0 / 12%), 0 4px 8px -2px rgb(0 0 0 / 8%);
  --radius: 8px;
  --header-height: 96px;
  --content-width: 1338px;
  color-scheme: light;
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: var(--theme-bg);
}

body {
  min-height: 100%;
  margin: 0;
  color: var(--theme-text);
  background: var(--theme-bg);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  letter-spacing: 0.5px;
  -webkit-font-smoothing: antialiased;
}

button,
input {
  font: inherit;
}

button {
  color: inherit;
  transition: all 200ms ease;
}

.site {
  min-height: 100vh;
}

.header {
  height: var(--header-height);
  border-bottom: 1px solid transparent;
}

.header-inner {
  width: 100%;
  max-width: 576px;
  height: 100%;
  margin: 0 auto;
  padding: 0 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 36px;
}

.brand {
  appearance: none;
  border: 0;
  padding: 0;
  background: transparent;
  font-size: 32px;
  font-weight: 800;
  line-height: 1;
  letter-spacing: 0;
  cursor: pointer;
}

.brand:hover {
  color: var(--theme-accent);
}

.header-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 14px;
  min-width: 0;
}

.sync-state {
  color: var(--theme-text-light);
  font-size: 14px;
  white-space: nowrap;
}

.text-button {
  appearance: none;
  border: 1px solid var(--theme-divider);
  border-radius: var(--radius);
  padding: 6px 12px;
  background: #fff;
  color: var(--theme-text);
  cursor: pointer;
  transition: border-color 160ms ease, color 160ms ease, opacity 160ms ease;
  white-space: nowrap;
}

.text-button:hover {
  border-color: var(--theme-accent);
  color: var(--theme-accent);
}

.text-button.primary {
  border-color: var(--theme-accent);
  color: var(--theme-accent);
}

.text-button:disabled {
  cursor: default;
  opacity: 0.55;
}

.main {
  width: 100%;
  min-height: calc(100vh - var(--header-height));
}

body[data-view="detail"] .header {
  display: none;
}

body[data-view="detail"] .main {
  min-height: 100vh;
}

.home {
  width: 100%;
  max-width: 576px;
  margin: 0 auto;
  padding: 0 16px 64px;
}

.book-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, 172px);
  justify-content: start;
  gap: 24px 20px;
}

.notice {
  margin: 0 0 24px;
  padding: 12px 14px;
  border: 1px solid var(--theme-divider);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  color: var(--theme-text-light);
  background: #fff;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 14px;
}

.book-card {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  width: 172px;
  border: 0;
  border-radius: var(--radius);
  background: #fff;
  box-shadow: 0 4px 12px rgb(0 0 0 / 6%), 0 1px 3px rgb(0 0 0 / 5%);
  text-align: left;
  text-decoration: none;
  cursor: pointer;
  transition: all 200ms ease;
}

.book-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--theme-shadow);
}

.cover-wrap {
  width: 172px;
  height: 238px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--theme-bg-soft);
  border-bottom: 1px solid var(--theme-divider);
  transition: transform 200ms ease;
}

.book-card:hover .cover-wrap {
  transform: scale(1.02);
}

.cover-wrap img {
  display: block;
  width: 100%;
  height: 100%;
  border-radius: 0;
  object-fit: cover;
  box-shadow: none;
}

.card-body {
  padding: 12px;
}

.book-title {
  margin: 0;
  color: #1f2937;
  font-size: 16px;
  line-height: 1.35;
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.book-author {
  min-height: 24px;
  margin: 6px 0 0;
  color: #4b5563;
  font-size: 14px;
  line-height: 1.5;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.book-meta {
  margin-top: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  color: var(--theme-text-light);
  font-size: 13px;
}

.status-badge {
  color: var(--theme-accent);
}

.panel {
  width: min(680px, calc(100vw - 32px));
  margin: 44px auto 0;
  border: 1px solid var(--theme-divider);
  border-radius: var(--radius);
  background: #fff;
  padding: 32px;
  text-align: center;
}

.panel h1,
.panel h2 {
  margin: 0 0 12px;
  font-size: 24px;
  line-height: 1.35;
}

.panel p {
  margin: 0 auto 22px;
  max-width: 460px;
  color: var(--theme-text-light);
  font-size: 17px;
}

.qr-box {
  width: 320px;
  max-width: 100%;
  margin: 18px auto 0;
  padding: 16px;
  border: 1px solid var(--theme-divider);
  border-radius: var(--radius);
  background: #fff;
}

.qr-box img {
  display: block;
  width: 100%;
  height: auto;
}

.loading-line {
  color: var(--theme-text-light);
  font-size: 14px;
}

.loading-panel {
  padding-top: 38px;
}

.loader {
  width: 38px;
  height: 38px;
  margin: 0 auto 18px;
  border: 2px solid var(--theme-divider);
  border-top-color: var(--theme-accent);
  border-radius: 50%;
  animation: spin 900ms linear infinite;
}

.sync-steps {
  width: 96px;
  margin: 18px auto 0;
  display: flex;
  justify-content: center;
  gap: 8px;
}

.sync-steps span {
  width: 7px;
  height: 7px;
  border-radius: 999px;
  background: var(--theme-accent);
  opacity: 0.35;
  animation: pulse 1100ms ease-in-out infinite;
}

.sync-steps span:nth-child(2) {
  animation-delay: 140ms;
}

.sync-steps span:nth-child(3) {
  animation-delay: 280ms;
}

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

@keyframes pulse {
  0%,
  100% {
    opacity: 0.25;
    transform: translateY(0);
  }
  45% {
    opacity: 1;
    transform: translateY(-3px);
  }
}

.detail {
  width: 100%;
  max-width: 1392px;
  margin: 0 auto;
  padding-bottom: 72px;
}

.detail-layout {
  display: grid;
  grid-template-columns: 320px minmax(0, 864px) 208px;
  gap: 0;
  align-items: start;
}

.detail-sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  min-height: 200px;
  padding: 13px 32px 32px;
}

.detail-side-list {
  margin-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.side-brand {
  appearance: none;
  width: 100%;
  height: 76px;
  display: flex;
  align-items: center;
  border: 0;
  background: transparent;
  padding: 0;
  color: var(--theme-text);
  font-family: inherit;
  font-size: 32px;
  font-weight: 800;
  line-height: 1;
  letter-spacing: 0;
  text-align: left;
  cursor: pointer;
}

.side-brand:hover {
  color: var(--theme-accent);
}

.back-button {
  appearance: none;
  display: inline-flex;
  min-height: 38px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--theme-divider);
  border-radius: 999px;
  background: var(--theme-bg);
  padding: 7px 15px;
  color: var(--theme-text);
  font-family: inherit;
  font-size: 15px;
  text-align: left;
  cursor: pointer;
  transition: border-color 0.2s ease, color 0.2s ease, background 0.2s ease;
}

.back-button:hover {
  border-color: var(--theme-accent);
  background: var(--theme-bg-soft);
  color: var(--theme-accent);
}

.side-book {
  appearance: none;
  width: 100%;
  border: 0;
  border-left: 2px solid transparent;
  padding: 6px 0 6px 12px;
  background: transparent;
  color: var(--theme-text-light);
  text-align: left;
  cursor: pointer;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.side-book.active,
.side-book:hover {
  border-left-color: var(--theme-accent);
  color: var(--theme-text);
}

.article {
  min-width: 0;
  padding: 13px 32px 64px;
}

.article-top {
  display: none;
  margin-bottom: 20px;
}

.article-brand {
  appearance: none;
  border: 0;
  background: transparent;
  padding: 0;
  color: var(--theme-text);
  font-family: inherit;
  font-size: 22px;
  font-weight: 800;
  line-height: 1;
  cursor: pointer;
}

.article-brand:hover {
  color: var(--theme-accent);
}

.article h1 {
  margin: 0;
  color: #1f2937;
  font-size: clamp(32px, 5vw, 52px);
  line-height: 1.2;
  font-weight: 800;
  letter-spacing: 0.32px;
}

.article-meta {
  margin-top: 10px;
  color: var(--theme-text-light);
  font-size: 14px;
}

.article-actions {
  margin-top: 18px;
}

.article-body {
  margin-top: 36px;
  padding-bottom: 40px;
}

.article-body h2,
.article-body h3,
.article-body h4,
.article-body h5 {
  margin: 42px 0 16px;
  color: var(--theme-text);
  font-weight: 700;
  line-height: 1;
}

.article-body h2 {
  font-size: clamp(28px, 4vw, 40px);
}

.article-body h3,
.article-body h4,
.article-body h5 {
  font-size: clamp(22px, 3vw, 28px);
}

.article-body p,
.article-body li {
  color: var(--theme-text);
  font-size: 17px;
  line-height: 1.7;
}

.article-body p {
  margin: 12px 0;
}

.article-body ul {
  margin: 12px 0 18px;
  padding-left: 22px;
}

.article-body blockquote {
  margin: 18px 0;
  padding: 12px 18px;
  border-left: 3px solid var(--theme-divider);
  background: #fafafa;
  color: var(--theme-text);
}

.article-body blockquote p {
  margin: 4px 0;
}

.article-body code {
  padding: 2px 5px;
  border-radius: 4px;
  background: var(--theme-bg-soft);
  font-family: var(--font-mono);
  font-size: 0.92em;
}

.right-space {
  min-height: 1px;
}

.toast {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 10;
  max-width: min(360px, calc(100vw - 32px));
  border: 1px solid var(--theme-divider);
  border-radius: var(--radius);
  background: rgb(255 255 255 / 96%);
  box-shadow: var(--theme-shadow);
  padding: 12px 16px;
  color: var(--theme-text);
  font-size: 14px;
}

@media (min-width: 640px) {
  .header-inner,
  .home {
    padding-left: 12px;
    padding-right: 12px;
  }
}

@media (min-width: 768px) {
  .header-inner,
  .home {
    max-width: 659px;
    padding-left: 0;
    padding-right: 0;
  }
}

@media (min-width: 1080px) {
  .header-inner,
  .home {
    max-width: 998px;
  }
}

@media (min-width: 1412px) {
  .header-inner,
  .home {
    max-width: 1338px;
  }
}

@media (max-width: 1100px) {
  .book-grid {
    grid-template-columns: repeat(auto-fill, 164px);
    gap: 28px 22px;
  }

  .cover-wrap {
    width: 164px;
    height: 226px;
  }

  .book-card {
    width: 164px;
  }

  .detail-layout {
    grid-template-columns: 240px minmax(0, 1fr);
  }

  .right-space {
    display: none;
  }
}

@media (max-width: 800px) {
  :root {
    --header-height: 76px;
  }

  .header-inner,
  .home,
  .detail {
    width: min(100vw - 28px, 680px);
  }

  .header-inner {
    gap: 12px;
  }

  .brand {
    font-size: 20px;
  }

  .sync-state {
    display: none;
  }

  .book-grid {
    grid-template-columns: repeat(auto-fill, 156px);
    gap: 22px 16px;
  }

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

  .cover-wrap {
    width: 156px;
    height: 216px;
  }

  .book-card {
    width: 156px;
  }

  .card-body {
    padding: 12px 12px 14px;
  }

  .book-title {
    font-size: 17px;
  }

  .detail-layout {
    display: block;
  }

  .detail-sidebar {
    display: none;
  }

  .article-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
  }

  .article h1 {
    font-size: 30px;
  }

  .article-body {
    margin-top: 28px;
  }
}

@media (max-width: 520px) {
  .header-actions {
    gap: 8px;
  }

  .text-button {
    padding: 5px 11px;
    font-size: 14px;
  }

  .book-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px 14px;
  }

  .cover-wrap {
    width: 100%;
    height: auto;
    aspect-ratio: 172 / 238;
  }

  .book-card {
    width: 100%;
  }

  .panel {
    margin-top: 24px;
    padding: 24px 18px;
  }

  .article h1 {
    font-size: 26px;
  }

  .article-body p,
  .article-body li {
    font-size: 16px;
  }

  .toast {
    right: 14px;
    bottom: 14px;
  }
}