/* ===== Paper-Specific Styles ===== */

/* ===== Abstract Section ===== */
.abstract-section {
  background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
  border: 1px solid #bae6fd;
  border-radius: 12px;
  padding: 24px;
  margin-bottom: 32px;
}

.abstract-section .paragraph-pair {
  border-bottom: none;
}

.abstract-section .paragraph-pair .en,
.abstract-section .paragraph-pair .zh {
  background: transparent;
  padding: 12px 16px;
}

.abstract-section .paragraph-pair .zh {
  background: rgba(255, 255, 255, 0.6);
  border-radius: 8px;
}

.abstract-section .paragraph-pair:hover .en {
  background-color: rgba(255, 202, 67, 0.15);
}

.abstract-section .paragraph-pair:hover .zh {
  background-color: rgba(255, 202, 67, 0.3);
}

/* Dark mode for abstract */
[data-theme="dark"] .abstract-section {
  background: linear-gradient(135deg, #1e3a5f 0%, #1e3a5f 100%);
  border-color: #374151;
}

[data-theme="dark"] .abstract-section .paragraph-pair .zh,
[data-theme="dark"] .abstract-section .paragraph-pair .bilingual-row__zh {
  background: rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] .abstract-label {
  color: #60a5fa;
}

[data-theme="dark"] .abstract-label::before {
  background: #60a5fa;
}

.abstract-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: #0369a1;
  margin-bottom: 12px;
}

.abstract-label::before {
  content: '';
  display: inline-block;
  width: 4px;
  height: 16px;
  background: #0369a1;
  border-radius: 2px;
}

/* ===== Section Headers ===== */
.section-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 24px;
  background: var(--color-bg-secondary);
  border-bottom: 2px solid var(--color-border);
  font-family: var(--font-sans);
}

.section-number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: var(--color-primary);
  color: white;
  border-radius: 50%;
  font-weight: 600;
  font-size: 14px;
}

.section-title {
  flex: 1;
  display: flex;
  gap: 0;
}

.section-title .en,
.section-title .zh {
  flex: 1;
  font-size: 1.1rem;
  font-weight: 600;
}

.section-title .en {
  padding-right: 12px;
  border-right: 1px solid var(--color-border);
}

.section-title .zh {
  padding-left: 12px;
  color: var(--color-text-secondary);
}

/* ===== Keywords ===== */
.keywords {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border-light);
}

.keywords__label {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-right: 8px;
}

.keyword {
  display: inline-block;
  padding: 4px 12px;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  font-size: 13px;
  color: var(--color-text-secondary);
}

/* ===== Translation Credit ===== */
.translation-credit {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
  padding: 12px 16px;
  background: linear-gradient(135deg, #f0fdf4 0%, #dcfce7 100%);
  border: 1px solid #86efac;
  border-radius: 8px;
  font-size: 13px;
}

.translation-credit svg {
  color: #16a34a;
  flex-shrink: 0;
}

.translation-credit__label {
  font-weight: 600;
  color: #166534;
}

.translation-credit__translator {
  color: #16a34a;
  font-weight: 600;
  padding: 2px 8px;
  background: rgba(22, 163, 74, 0.15);
  border-radius: 4px;
}

.translation-credit__note {
  flex-basis: 100%;
  margin-top: 4px;
  font-size: 12px;
  color: #166534;
  opacity: 0.8;
}

/* Dark mode for translation credit */
[data-theme="dark"] .translation-credit {
  background: linear-gradient(135deg, #052e16 0%, #14532d 100%);
  border-color: #166534;
}

[data-theme="dark"] .translation-credit svg {
  color: #4ade80;
}

[data-theme="dark"] .translation-credit__label {
  color: #86efac;
}

[data-theme="dark"] .translation-credit__translator {
  color: #4ade80;
  background: rgba(74, 222, 128, 0.15);
}

[data-theme="dark"] .translation-credit__note {
  color: #86efac;
}

/* ===== Figure/Table Placeholder ===== */
.figure-wrapper {
  padding: 24px;
  border-bottom: 1px solid var(--color-border-light);
  text-align: center;
}

.figure-placeholder {
  background: var(--color-bg-secondary);
  border: 2px dashed var(--color-border);
  border-radius: 8px;
  padding: 40px 24px;
  color: var(--color-text-secondary);
}

.figure-placeholder__icon {
  font-size: 32px;
  margin-bottom: 12px;
}

.figure-placeholder__text {
  font-size: 14px;
}

.figure-caption {
  margin-top: 12px;
  font-size: 14px;
  color: var(--color-text-secondary);
}

.figure-caption strong {
  color: var(--color-text);
}

/* ===== Equation ===== */
.equation-wrapper {
  padding: 24px;
  border-bottom: 1px solid var(--color-border-light);
  text-align: center;
}

.equation {
  display: inline-block;
  padding: 16px 32px;
  background: var(--color-bg-secondary);
  border-radius: 8px;
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-style: italic;
}

.equation-number {
  float: right;
  color: var(--color-text-secondary);
  font-style: normal;
}

/* ===== References Section ===== */
.references-section {
  margin-top: 40px;
  padding-top: 32px;
  border-top: 2px solid var(--color-border);
}

.references-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.references-title::before {
  content: '📚';
}

.reference-item {
  display: flex;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--color-border-light);
  font-size: 14px;
  line-height: 1.6;
}

.reference-item:last-child {
  border-bottom: none;
}

.reference-number {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-secondary);
  border-radius: 4px;
  font-size: 12px;
  font-weight: 600;
  color: var(--color-text-secondary);
}

.reference-text {
  flex: 1;
}

.reference-text .authors {
  font-weight: 500;
}

.reference-text .title {
  font-style: italic;
}

.reference-text .journal {
  color: var(--color-text-secondary);
}

/* ===== Footnotes ===== */
.footnote {
  font-size: 0.85em;
  color: var(--color-text-secondary);
  vertical-align: super;
}

.footnote-content {
  padding: 16px 24px;
  background: var(--color-bg-secondary);
  border-left: 3px solid var(--color-border);
  font-size: 14px;
  margin: 12px 0;
}

/* ===== Paper Info Card ===== */
.paper-info {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 20px 24px;
  margin-bottom: 32px;
}

.paper-info__row {
  display: flex;
  gap: 16px;
  padding: 8px 0;
  border-bottom: 1px solid var(--color-border-light);
  font-size: 14px;
}

.paper-info__row:last-child {
  border-bottom: none;
}

.paper-info__label {
  flex-shrink: 0;
  width: 100px;
  font-weight: 600;
  color: var(--color-text-secondary);
}

.paper-info__value {
  flex: 1;
  color: var(--color-text);
}

/* ===== Reading Progress ===== */
.reading-progress {
  position: fixed;
  top: 56px;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--color-border-light);
  z-index: 99;
}

.reading-progress__bar {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary), #60a5fa);
  width: 0%;
  transition: width 0.1s;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .abstract-section {
    padding: 16px;
    margin: 0 -16px 24px;
    border-radius: 0;
  }

  .section-header {
    padding: 12px 16px;
  }

  .section-title {
    flex-direction: column;
    gap: 4px;
  }

  .section-title .en {
    border-right: none;
    padding-right: 0;
  }

  .section-title .zh {
    padding-left: 0;
    font-size: 0.95rem;
  }

  .paper-info {
    margin: 0 -16px 24px;
    border-radius: 0;
    border-left: none;
    border-right: none;
  }
}