/* 章节幻灯片：与 app.js 内 SlideDeckRenderer / slide_deck_design 模版 id 对应 */

.slide-deck-root {
  --slide-bg: #f8fafc;
  --slide-fg: #0f172a;
  --slide-muted: #64748b;
  --slide-card: #ffffff;
  --slide-border: #e2e8f0;
  --slide-accent: #3158ec;
  border: 1px solid var(--slide-border);
  border-radius: 12px;
  overflow: hidden;
  background: var(--slide-bg);
  color: var(--slide-fg);
  font-size: 15px;
  line-height: 1.5;
}

.slide-deck-root.theme-dark-physics {
  --slide-bg: #0f172a;
  --slide-fg: #e2e8f0;
  --slide-muted: #94a3b8;
  --slide-card: #1e293b;
  --slide-border: #334155;
  --slide-accent: #38bdf8;
}

.slide-stage-wrap {
  padding: 16px;
  min-height: 280px;
}

.slide-stage {
  min-height: 260px;
  background: var(--slide-card);
  border: 1px solid var(--slide-border);
  border-radius: 10px;
  padding: 20px;
  position: relative;
  overflow: hidden;
}

.slide-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  background: var(--slide-card);
  border-top: 1px solid var(--slide-border);
}

.slide-progress {
  flex: 1;
  min-width: 140px;
  font-size: 13px;
  color: var(--slide-muted);
}

.slide-toolbar .btn.sm {
  padding: 6px 12px;
  font-size: 13px;
}

/* —— 模版：整页 grid —— */
.slide-tpl {
  display: block;
  min-height: 220px;
}

.slide-el {
  margin-bottom: 12px;
}
.slide-el:last-child {
  margin-bottom: 0;
}

/* cover-image */
.slide-tpl-cover-image {
  position: relative;
  min-height: 260px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  gap: 12px;
}
.slide-tpl-cover-image .slide-role-background {
  position: absolute;
  inset: 0;
  margin: 0;
  z-index: 0;
  opacity: 0.35;
  pointer-events: none;
}
.slide-tpl-cover-image .slide-role-background .slide-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 10px;
}
.slide-tpl-cover-image .slide-role-title,
.slide-tpl-cover-image .slide-role-subtitle,
.slide-tpl-cover-image .slide-role-tagline {
  position: relative;
  z-index: 1;
}
.slide-tpl-cover-image .slide-role-title .slide-md {
  font-size: 1.75rem;
  font-weight: 700;
}
.slide-tpl-cover-image .slide-role-subtitle .slide-md {
  font-size: 1.15rem;
  color: var(--slide-muted);
}

/* title-body */
.slide-tpl-title-body .slide-role-title .slide-md {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 8px;
}
.slide-tpl-title-body .slide-role-body .slide-md {
  font-size: 1rem;
}
.slide-tpl-title-body .slide-role-callout {
  border-left: 4px solid var(--slide-accent);
  padding: 8px 12px;
  background: rgba(49, 88, 236, 0.06);
  border-radius: 0 8px 8px 0;
}

/* formula-focus */
.slide-tpl-formula-focus {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 16px;
}
.slide-tpl-formula-focus .slide-role-main-formula {
  font-size: 1.25rem;
}
.slide-tpl-formula-focus .slide-role-annotation .slide-md {
  color: var(--slide-muted);
  font-size: 0.95rem;
}

/* split-left-right */
.slide-tpl-split-left-right {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: auto 1fr;
  gap: 16px;
  align-items: start;
}
.slide-tpl-split-left-right .slide-role-title {
  grid-column: 1 / -1;
}
.slide-tpl-split-left-right .slide-role-main-formula {
  grid-column: 1;
  grid-row: 2;
}
.slide-tpl-split-left-right .slide-role-illustration {
  grid-column: 2;
  grid-row: 2;
}
.slide-tpl-split-left-right .slide-role-body {
  grid-column: 1 / -1;
  grid-row: 3;
}

/* split-top-bottom */
.slide-tpl-split-top-bottom {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.slide-tpl-split-top-bottom .slide-role-illustration .slide-img {
  max-height: 220px;
  width: 100%;
  object-fit: contain;
}

/* quiz-center */
.slide-tpl-quiz-center {
  display: flex;
  flex-direction: column;
  align-items: center;
}
.slide-tpl-quiz-center .slide-role-title {
  width: 100%;
  text-align: center;
  margin-bottom: 8px;
}
.slide-tpl-quiz-center .slide-question {
  width: 100%;
  max-width: 640px;
}

/* bullet-steps */
.slide-tpl-bullet-steps .slide-role-bullet .slide-md {
  margin: 4px 0;
  padding-left: 8px;
  border-left: 3px solid var(--slide-accent);
}

/* two-column-text */
.slide-tpl-two-column-text {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.slide-tpl-two-column-text .slide-role-title {
  grid-column: 1 / -1;
}

/* Markdown 块 */
.slide-md-ul {
  margin: 8px 0;
  padding-left: 1.25rem;
}
.slide-md-p {
  margin: 6px 0;
}

/* 正文 Markdown 中的 $...$（KaTeX 行内）、$$...$$（块级） */
.slide-math-inline {
  display: inline;
  vertical-align: baseline;
}
.slide-math-inline .katex {
  font-size: 1.08em;
}
.slide-math-block {
  margin: 10px 0;
  overflow-x: auto;
  text-align: center;
}
.slide-math-block .katex-display {
  margin: 0.5em 0;
}

/* 图片 */
.slide-img {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: 8px;
}
.slide-caption {
  margin-top: 8px;
  font-size: 13px;
  color: var(--slide-muted);
}

/* 题目 */
.slide-q-prompt {
  font-weight: 600;
  margin-bottom: 12px;
}
.slide-q-opt {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin: 8px 0;
  cursor: pointer;
}
.slide-q-opt input {
  margin-top: 4px;
}
.slide-latex-fallback {
  margin: 0;
  padding: 8px;
  background: rgba(0, 0, 0, 0.04);
  border-radius: 6px;
  font-size: 14px;
  overflow-x: auto;
}

.theme-dark-physics .slide-latex-fallback {
  background: rgba(255, 255, 255, 0.06);
}

/* 双栏在小屏叠成单列 */
@media (max-width: 640px) {
  .slide-tpl-split-left-right,
  .slide-tpl-two-column-text {
    grid-template-columns: 1fr;
  }
  .slide-tpl-split-left-right .slide-role-main-formula,
  .slide-tpl-split-left-right .slide-role-illustration,
  .slide-tpl-split-left-right .slide-role-body {
    grid-column: 1;
    grid-row: auto;
  }
}

/* 学生端：幻灯片 + AI 占位双栏 */
.slide-learn-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 16px;
  align-items: start;
}
.slide-learn-ai {
  border: 1px dashed var(--border, #e2e8f2);
  border-radius: 10px;
  padding: 12px;
  font-size: 13px;
  color: var(--muted, #64748b);
  min-height: 200px;
}
@media (max-width: 860px) {
  .slide-learn-layout {
    grid-template-columns: 1fr;
  }
}