:root {
  --program-accent: #173f67;
  --program-accent-soft: #e9f1f8;
  --program-border: #c8d6e5;
  --program-keynote: #fff2c7;
  --program-talk: #e1edf8;
  --program-session: #e4f1dc;
  --program-break: #eeeeee;
  --program-text-muted: #596675;
}

#program-schedule {
  margin-top: 1.5rem;
}

.program-subtitle {
  margin: 0;
  color: var(--program-text-muted);
  font-style: italic;
}

.program-notice {
  margin: 0.85rem 0 0;
  padding: 0.8rem 1rem;
  border-left: 4px solid var(--program-accent);
  background: var(--program-accent-soft);
}

.program-day {
  margin: 2rem 0;
}

.program-day h4,
.session-papers-heading h4 {
  margin: 0 0 0.8rem;
  color: var(--program-accent);
  font-size: 1.25rem;
}

.schedule-table-wrap {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--program-border);
  border-radius: 10px;
  background: #fff;
}

.schedule-table {
  width: 100%;
  min-width: 900px;
  border-collapse: collapse;
  table-layout: fixed;
}

.schedule-table th,
.schedule-table td {
  padding: 0.75rem;
  border: 1px solid var(--program-border);
  text-align: center;
  vertical-align: middle;
  line-height: 1.35;
}

.schedule-table thead th {
  background: var(--program-accent);
  color: #fff;
  font-weight: 700;
}


.schedule-table tbody th[scope="row"] {
  width: 125px;
  background: #fafbfd;
  white-space: nowrap;
  font-weight: 600;
}

.schedule-keynote {
  background: var(--program-keynote);
}

.schedule-talk {
  background: var(--program-talk);
}

.schedule-session {
  background: var(--program-session);
  font-weight: 700;
}

.schedule-break {
  background: var(--program-break);
  font-weight: 600;
}

.schedule-empty {
  color: #a2acb6;
}

.session-link {
  display: inline-block;
  padding: 0.35rem 0.65rem;
  border-radius: 999px;
  color: #173f67;
  text-decoration: none;
  font-weight: 700;
}

.session-link:hover,
.session-link:focus-visible {
  background: rgba(255, 255, 255, 0.72);
  text-decoration: underline;
}

.session-papers-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 1rem;
  margin: 2.5rem 0 1rem;
}

.session-papers-heading p {
  margin: 0;
  color: var(--program-text-muted);
}

.session-actions {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.session-actions button {
  border: 1px solid var(--program-accent);
  border-radius: 7px;
  padding: 0.5rem 0.8rem;
  background: #fff;
  color: var(--program-accent);
  cursor: pointer;
  font: inherit;
  font-weight: 600;
}

.session-actions button:hover,
.session-actions button:focus-visible {
  background: var(--program-accent-soft);
}

.session-list {
  display: grid;
  gap: 0.9rem;
}

.session-card {
  scroll-margin-top: 1rem;
  border: 1px solid var(--program-border);
  border-radius: 10px;
  background: #fff;
  overflow: hidden;
}

.session-card:target {
  outline: 3px solid rgba(23, 63, 103, 0.22);
  outline-offset: 3px;
}

.session-card summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  padding: 1rem 1.1rem;
  background: var(--program-accent-soft);
  cursor: pointer;
}

.session-summary-main {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.session-summary-main strong {
  color: var(--program-accent);
  font-size: 1.05rem;
}

.session-summary-main span,
.session-slot {
  color: var(--program-text-muted);
  font-size: 0.92rem;
}

.session-card-unscheduled summary {
  background: #f7f2e9;
}

.paper-list {
  margin: 0;
  padding: 0 1.25rem 1rem 3rem;
}

.paper-list li {
  padding: 1rem 0;
  border-bottom: 1px solid #e6ebf0;
}

.paper-list li:last-child {
  border-bottom: 0;
}

.paper-list h5 {
  margin: 0.25rem 0 0.45rem;
  font-size: 1rem;
  line-height: 1.45;
}

.paper-list p,
.paper-id {
  margin: 0;
  color: var(--program-text-muted);
}

.paper-id {
  font-size: 0.86rem;
  font-weight: 600;
}

.program-error {
  padding: 1rem;
  border: 1px solid #c0392b;
  background: #fff4f2;
  color: #8e2b20;
}

@media (max-width: 760px) {
  .session-papers-heading,
  .session-card summary {
    align-items: flex-start;
    flex-direction: column;
  }

  .schedule-table th,
  .schedule-table td {
    padding: 0.6rem;
    font-size: 0.9rem;
  }
}

/* 左上角 Time 表头 */
.schedule-table thead th.time-header {
  color: #173f67 !important;
  /* background: #f3f6f9; */
}

/* 左侧所有时间单元格 */
.schedule-table tbody th[scope="row"] {
  color: #173f67 !important;
  background: #fafbfd;
  font-weight: 600;
}

/* Time 表头：蓝底白字 */
.schedule-table thead th.time-header {
  background-color: #173f67 !important;
  color: #ffffff !important;
}

/* 左侧所有时间格：浅色底、深色字 */
.schedule-table tbody th[scope="row"] {
  background-color: #fafbfd !important;
  color: #173f67 !important;
  font-weight: 600;
}