:root {
  --bg-color: var(--tg-theme-bg-color, #ffffff);
  --text-color: var(--tg-theme-text-color, #1a1a1a);
  --hint-color: var(--tg-theme-hint-color, #707579);
  --card-bg: var(--tg-theme-secondary-bg-color, #f4f4f5);
  --accent-color: var(--tg-theme-button-color, #2481cc);
  --accent-text: var(--tg-theme-button-text-color, #ffffff);
  --danger-color: #e53e3e;
  --border-color: rgba(0, 0, 0, 0.08);
}

body {
  margin: 0;
  padding: 16px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.center-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 80vh;
  text-align: center;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid rgba(0, 0, 0, 0.1);
  border-top-color: var(--accent-color);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* 顶部导航与操作条 */
.top-nav {
  margin-bottom: 16px;
}

.btn-back {
  background-color: var(--card-bg);
  color: var(--accent-color);
  border: 1px solid var(--border-color);
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
}

/* 全刊导读页头 */
.issue-header {
  margin-bottom: 24px;
}

.badge {
  display: inline-block;
  padding: 4px 8px;
  font-size: 12px;
  font-weight: 600;
  border-radius: 4px;
  background-color: var(--accent-color);
  color: var(--accent-text);
  margin-bottom: 8px;
}

.badge-primary {
  background-color: #007aff;
}

.badge-column {
  background-color: #5856d6;
}

.badge-feature {
  background-color: #ff9500;
}

h1 {
  font-size: 22px;
  line-height: 1.35;
  margin: 8px 0;
  font-weight: 700;
}

h2 {
  font-size: 15px;
  font-weight: 400;
  color: var(--hint-color);
  margin: 0 0 10px 0;
}

.overview-meta {
  font-size: 13px;
  color: var(--hint-color);
  margin: 4px 0 16px 0;
}

/* 原版目录扫描件折叠核验区 */
.toc-verify-panel {
  margin: 14px 0 20px 0;
}

.btn-toggle-toc {
  width: 100%;
  background: var(--card-bg);
  border: 1px dashed var(--accent-color);
  color: var(--accent-color);
  padding: 12px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  text-align: center;
}

.toc-image-box {
  margin-top: 12px;
  padding: 12px;
  background: var(--card-bg);
  border-radius: 12px;
  border: 1px solid var(--border-color);
}

.toc-hint {
  font-size: 12px;
  color: var(--hint-color);
  margin-top: 0;
  margin-bottom: 10px;
}

.toc-img {
  width: 100%;
  height: auto;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  display: block;
}

/* 全刊导读卡片列表 */
.digest-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.digest-card {
  background-color: var(--card-bg);
  border-radius: 14px;
  padding: 18px;
  border: 1px solid var(--border-color);
  box-shadow: 0 1px 4px rgba(0,0,0,0.03);
}

.digest-card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.digest-index {
  font-size: 13px;
  font-weight: bold;
  color: var(--accent-color);
}

.digest-page {
  font-size: 12px;
  color: var(--hint-color);
}

.digest-title-zh {
  font-size: 18px;
  font-weight: 700;
  margin: 4px 0;
  line-height: 1.4;
}

.digest-title-en {
  font-size: 13px;
  color: var(--hint-color);
  margin: 0 0 10px 0;
}

.digest-author {
  font-size: 12px;
  color: var(--hint-color);
  margin-bottom: 12px;
}

.digest-thesis-box {
  background: var(--bg-color);
  border-left: 3px solid var(--accent-color);
  padding: 10px 12px;
  border-radius: 6px;
  margin-bottom: 12px;
}

.digest-thesis-label {
  font-size: 11px;
  font-weight: 700;
  color: var(--accent-color);
  text-transform: uppercase;
  margin-bottom: 4px;
}

.digest-thesis-text {
  font-size: 15px;
  line-height: 1.6;
  margin: 0;
}

.digest-highlights-label {
  font-size: 12px;
  font-weight: 700;
  color: var(--text-color);
  margin: 10px 0 6px 0;
}

.digest-highlights-list {
  margin: 0 0 14px 0;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.6;
}

.digest-highlights-list li {
  margin-bottom: 4px;
}

.btn-read-detail {
  width: 100%;
  background-color: var(--accent-color);
  color: var(--accent-text);
  border: none;
  padding: 10px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  text-align: center;
}

/* 单篇文章详情卡片 */
.metadata {
  font-size: 13px;
  color: var(--hint-color);
}

.card {
  background-color: var(--card-bg);
  border-radius: 12px;
  padding: 16px;
  margin-bottom: 16px;
}

.thesis-card {
  border-left: 4px solid var(--accent-color);
}

.card-tag {
  font-size: 11px;
  font-weight: bold;
  text-transform: uppercase;
  color: var(--accent-color);
  margin-bottom: 6px;
}

.section-title {
  font-size: 16px;
  margin-top: 0;
  margin-bottom: 10px;
}

ul {
  margin: 0;
  padding-left: 20px;
}

li {
  margin-bottom: 6px;
}

.chart-item {
  margin-bottom: 16px;
  background-color: var(--bg-color);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.chart-item img {
  width: 100%;
  height: auto;
  display: block;
}

.chart-caption {
  padding: 8px 12px;
  font-size: 12px;
  color: var(--hint-color);
}

.risk-card {
  border-left: 4px solid var(--danger-color);
}

.translation-card {
  background-color: var(--card-bg);
  border-radius: 12px;
  padding: 20px;
}

.trans-p {
  font-size: 20px;
  line-height: 1.85;
  color: var(--text-color);
  margin: 0 0 18px 0;
  text-align: justify;
}

.trans-pending-box {
  background: var(--bg-color);
  border: 1px dashed var(--accent-color);
  border-radius: 10px;
  padding: 16px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--hint-color);
}

.trans-pending-box p {
  margin: 0 0 8px 0;
}

.trans-pending-box p:last-child {
  margin-bottom: 0;
}