/* ============================================================
   作业系统样式：学生列表 / 在线编辑器 / 教师批改抽屉的补充部分。
   其余一律复用 base.css（.panel/.btn/.input/.msg/.badge/.table-scroll）与
   admin.css（.tabs/.modal/.progress/.input-sm），只有这里没有的才新建。
   ============================================================ */

.hw-shell {
  max-width: 84rem;
  margin: 0 auto;
  padding: 1rem;
}

.hw-head {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

/* ---------------- 筛选胶囊 ---------------- */

.hw-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1rem;
}

.hw-chip {
  font-family: inherit;
  font-size: 0.85rem;
  padding: 0.35rem 0.75rem;
  min-height: 2.1rem;
  border: 1px solid #ccd2d9;
  background: #fff;
  border-radius: 999px;
  cursor: pointer;
  color: #3c4650;
}

.hw-chip.active {
  background: #2760a8;
  border-color: #2760a8;
  color: #fff;
}

/* ---------------- 作业卡片 ---------------- */

.hw-list {
  display: grid;
  gap: 0.75rem;
}

.hw-card {
  display: block;
  border: 1px solid #e3e6ea;
  border-radius: 10px;
  background: #fff;
  padding: 1rem 1.1rem;
  color: inherit;
  text-decoration: none;
}

.hw-card:hover {
  border-color: #b9c6d6;
  box-shadow: 0 2px 8px rgba(39, 96, 168, 0.08);
  text-decoration: none;
}

.hw-card-top {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: baseline;
  justify-content: space-between;
}

.hw-card-title {
  font-size: 1.05rem;
  font-weight: 700;
}

.hw-card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1rem;
  margin-top: 0.45rem;
  font-size: 0.84rem;
  color: #6b7681;
}

.hw-card-foot {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  margin-top: 0.6rem;
}

/* ---------------- 徽标 ---------------- */

.hw-badge {
  display: inline-block;
  font-size: 0.76rem;
  font-weight: 600;
  line-height: 1.5;
  padding: 0.1rem 0.5rem;
  border-radius: 4px;
  white-space: nowrap;
}

.hw-badge-pending {
  background: #fff4e5;
  color: #9a5b00;
}

.hw-badge-submitted {
  background: #e6effa;
  color: #24507f;
}

.hw-badge-graded {
  background: #eaf6ec;
  color: #26663a;
}

.hw-badge-overdue {
  background: #fdecea;
  color: #a53125;
}

.hw-badge-late {
  background: #fdecea;
  color: #a53125;
}

.hw-badge-soft {
  background: #f0f2f4;
  color: #5a646e;
}

.hw-badge-ai {
  background: #f3e8fd;
  color: #6b2fa0;
}

.hw-countdown {
  font-variant-numeric: tabular-nums;
  font-weight: 600;
}

.hw-countdown.soon {
  color: #b26a00;
}

.hw-countdown.over {
  color: #a53125;
}

.hw-score {
  font-size: 1.35rem;
  font-weight: 700;
  color: #1f508e;
  font-variant-numeric: tabular-nums;
}

/* ---------------- 首页提醒条 ---------------- */

.hw-reminder {
  margin: 0 auto 1.25rem;
  max-width: 60rem;
  border: 1px solid #f0d9a8;
  background: #fffaf0;
  border-radius: 10px;
  padding: 0.85rem 1rem;
  font-size: 0.9rem;
  color: #6b4b00;
}

.hw-reminder strong {
  color: #8a5a00;
}

.hw-reminder ul {
  margin: 0.4rem 0 0;
  padding-left: 1.1rem;
  line-height: 1.8;
}

.hw-reminder a {
  color: #9a5b00;
  font-weight: 600;
}

.hw-reminder.urgent {
  border-color: #f3b7ae;
  background: #fdf3f2;
  color: #8c2f22;
}

.hw-reminder.urgent strong,
.hw-reminder.urgent a {
  color: #a53125;
}

/* ---------------- 编辑器分屏 ---------------- */

.hw-editor-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

@media (min-width: 1100px) {
  .hw-editor-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }
}

.hw-pane {
  border: 1px solid #e3e6ea;
  border-radius: 10px;
  background: #fff;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.hw-pane-head {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 0.8rem;
  border-bottom: 1px solid #eceff2;
  background: #f9fafb;
  font-size: 0.88rem;
  font-weight: 600;
  color: #3c4650;
}

.hw-pane-body {
  padding: 0.9rem 1rem;
  min-width: 0;
}

.hw-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
  padding: 0.5rem 0.6rem;
  border-bottom: 1px solid #eceff2;
  background: #fdfdfe;
}

.hw-toolbar .btn {
  font-size: 0.78rem;
  min-height: 1.9rem;
  padding: 0.25rem 0.5rem;
  font-weight: 500;
}

/* 独立摆放的编辑器（后台作业库表单）需要自己带边框；
   学生页的编辑器嵌在 .hw-pane 里，边框由 pane 提供 */
.hw-editor-box {
  border: 1px solid #e3e6ea;
  border-radius: 8px;
  overflow: hidden;
  background: #fff;
}

/* EasyMDE 皮肤：与站点风格对齐，去掉自带的厚重边框 */
.hw-editor .EasyMDEContainer .CodeMirror {
  border: 0;
  border-radius: 0;
  font-family: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
  font-size: 0.9rem;
  line-height: 1.6;
}

.hw-editor .EasyMDEContainer .editor-toolbar,
.hw-editor .EasyMDEContainer .editor-statusbar {
  display: none;
}

.hw-editor .CodeMirror-scroll {
  min-height: 26rem;
}

/* 写作区内部的源码 / 预览分栏 */
.hw-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
}

@media (min-width: 1400px) {
  .hw-split.both {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }
}

.hw-split.src .hw-preview-cell,
.hw-split.prev .hw-editor-cell {
  display: none;
}

.hw-split.both .hw-preview-cell {
  border-top: 1px solid #eceff2;
}

@media (min-width: 1400px) {
  .hw-split.both .hw-preview-cell {
    border-top: 0;
    border-left: 1px solid #eceff2;
  }
}

/* ---------------- 源码编辑器里的代码配色 ---------------- */

/**
 * EasyMDE 自带的是 cm-s-easymde 主题，它只给 Markdown 元素上色
 * （.cm-tag/.cm-string/.cm-link…），CodeMirror 自带的 .cm-s-default 调色板
 * （.cm-number/.cm-operator 等）根本不会命中 —— 结果 Quarto chunk 里的 R 代码
 * 看起来是一整片灰，「chunk 里能高亮 R」这个卖点等于白做。
 * 下面按 codemirror/mode/r/r.js 实际产出的 token 名补齐一套最小配色。
 */
.cm-s-easymde .cm-variable {
  color: #24292f;
}

.cm-s-easymde .cm-variable-3 {
  color: #1f508e; /* 函数名 */
}

.cm-s-easymde .cm-number {
  color: #0b6b3a;
}

.cm-s-easymde .cm-operator {
  color: #8250df;
}

.cm-s-easymde .cm-keyword {
  color: #cf222e;
  font-weight: 600;
}

.cm-s-easymde .cm-builtin {
  color: #953800;
}

.cm-s-easymde .cm-string,
.cm-s-easymde .cm-string-2 {
  color: #0a3069;
}

.cm-s-easymde .cm-atom {
  color: #0550ae;
}

/* chunk 围栏行本身保持灰底，让「这是 chunk 选项」一眼可辨 */
.hw-editor .CodeMirror .cm-comment {
  color: #6b7681;
}

/* ---------------- 预览 ---------------- */

.md-preview {
  font-size: 0.92rem;
  line-height: 1.75;
  color: #2b2b2b;
  word-wrap: break-word;
  overflow-wrap: anywhere;
}

.md-preview h1,
.md-preview h2,
.md-preview h3 {
  margin: 1.2rem 0 0.6rem;
  line-height: 1.35;
}

.md-preview h1 {
  font-size: 1.35rem;
}

.md-preview h2 {
  font-size: 1.15rem;
}

.md-preview h3 {
  font-size: 1rem;
}

.md-preview p,
.md-preview ul,
.md-preview ol {
  margin: 0.6rem 0;
}

.md-preview ul,
.md-preview ol {
  padding-left: 1.4rem;
}

.md-preview blockquote {
  margin: 0.7rem 0;
  padding: 0.35rem 0.9rem;
  border-left: 3px solid #cfe0f3;
  background: #f6f9fd;
  color: #3c4650;
}

.md-preview table {
  border-collapse: collapse;
  margin: 0.7rem 0;
  display: block;
  overflow-x: auto;
}

.md-preview th,
.md-preview td {
  border: 1px solid #e3e6ea;
  padding: 0.3rem 0.6rem;
  text-align: left;
}

.md-preview img {
  max-width: 100%;
  height: auto;
  border-radius: 6px;
}

.md-preview code.md-codespan {
  background: #f0f2f4;
  padding: 0.05rem 0.3rem;
  border-radius: 4px;
  font-size: 0.88em;
}

.md-preview .md-inline-r {
  background: #eef4fb;
  color: #1f508e;
  padding: 0.05rem 0.3rem;
  border-radius: 4px;
  font-size: 0.88em;
}

.md-preview .md-code {
  margin: 0.7rem 0;
  border: 1px solid #e3e6ea;
  border-radius: 8px;
  overflow: hidden;
}

.md-preview .md-code pre {
  margin: 0;
  padding: 0.7rem 0.85rem;
  overflow-x: auto;
  background: #fbfcfd;
  font-size: 0.85rem;
  line-height: 1.6;
}

.md-preview .md-chunk-head {
  display: flex;
  gap: 0.6rem;
  align-items: center;
  padding: 0.25rem 0.7rem;
  background: #f1f5fa;
  border-bottom: 1px solid #e3e6ea;
  font-size: 0.76rem;
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
}

.md-preview .md-chunk-lang {
  font-weight: 700;
  color: #24507f;
  text-transform: uppercase;
}

.md-preview .md-chunk-opts {
  color: #7b8794;
}

.md-preview .md-frontmatter {
  margin: 0.6rem 0;
  border: 1px dashed #ccd2d9;
  border-radius: 8px;
  padding: 0.4rem 0.7rem;
  background: #fafbfc;
  font-size: 0.82rem;
}

.md-preview .md-frontmatter summary {
  cursor: pointer;
  color: #6b7681;
}

.md-preview .md-frontmatter-body {
  margin: 0.5rem 0 0.2rem;
  overflow-x: auto;
  font-size: 0.8rem;
  line-height: 1.6;
}

.md-preview .md-raw-html {
  margin: 0.5rem 0;
  padding: 0.3rem 0.6rem;
  border-left: 3px solid #e0b4b4;
  background: #fdf7f7;
  color: #8c5a5a;
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 0.8rem;
  white-space: pre-wrap;
}

.md-preview .md-bad-link {
  color: #a53125;
  text-decoration: line-through;
}

.md-preview .md-empty {
  color: #9aa4ad;
}

.md-preview .md-error {
  color: #a53125;
}

/* ---------------- 附件区 ---------------- */

.hw-attach-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.hw-attach-item {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.7rem;
  align-items: center;
  padding: 0.45rem 0;
  border-bottom: 1px solid #f0f2f4;
  font-size: 0.86rem;
}

.hw-attach-item:last-child {
  border-bottom: 0;
}

.hw-attach-name {
  flex: 1 1 12rem;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.hw-attach-rel {
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 0.78rem;
  color: #8b959e;
}

.hw-dropzone {
  border: 1.5px dashed #ccd2d9;
  border-radius: 8px;
  padding: 0.9rem;
  text-align: center;
  color: #8b959e;
  font-size: 0.85rem;
  background: #fbfcfd;
}

.hw-dropzone.hot {
  border-color: #2760a8;
  background: #f2f7fd;
  color: #24507f;
}

.hw-upload-progress {
  height: 0.35rem;
  background: #eceff2;
  border-radius: 999px;
  overflow: hidden;
  margin-top: 0.5rem;
  display: none;
}

.hw-upload-progress.on {
  display: block;
}

.hw-upload-progress > div {
  height: 100%;
  width: 0;
  background: #2760a8;
  transition: width 0.15s linear;
}

/* ---------------- 底部操作条 ---------------- */

.hw-actionbar {
  position: sticky;
  bottom: 0;
  margin-top: 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  padding: 0.75rem 0.9rem;
  background: rgba(255, 255, 255, 0.96);
  border: 1px solid #e3e6ea;
  border-radius: 10px;
  backdrop-filter: blur(4px);
  z-index: 5;
}

.hw-actionbar .hw-status {
  font-size: 0.85rem;
  color: #6b7681;
}

/* ---------------- 题面 ---------------- */

.hw-question {
  font-size: 0.92rem;
}

.hw-question h1 {
  font-size: 1.3rem;
}

.hw-notice {
  border: 1px solid #cfe0f3;
  background: #f6f9fd;
  color: #24507f;
  border-radius: 8px;
  padding: 0.7rem 0.9rem;
  font-size: 0.86rem;
  margin-bottom: 0.9rem;
  line-height: 1.7;
}

.hw-notice.warn {
  border-color: #f0d9a8;
  background: #fffaf0;
  color: #6b4b00;
}

/* ---------------- 批改抽屉 ---------------- */

.grade-drawer {
  position: fixed;
  inset: 0 0 0 auto;
  /* 太宽会把后面的名单表整个盖住，66rem 是「两栏批改」还够用、又不遮蔽上下文的折中 */
  width: min(66rem, 100%);
  background: #fff;
  box-shadow: -6px 0 24px rgba(0, 0, 0, 0.18);
  z-index: 120;
  display: flex;
  flex-direction: column;
}

.grade-drawer-head {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  justify-content: space-between;
  padding: 0.8rem 1rem;
  border-bottom: 1px solid #e3e6ea;
  background: #f9fafb;
}

.grade-drawer-body {
  flex: 1 1 auto;
  overflow-y: auto;
  padding: 1rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

@media (min-width: 1100px) {
  .grade-drawer-body {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  }
}

.grade-drawer-foot {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  padding: 0.8rem 1rem;
  border-top: 1px solid #e3e6ea;
  background: #fdfdfe;
}

.grade-field {
  margin-bottom: 0.8rem;
}

.grade-field label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.3rem;
  color: #3c4650;
}

.grade-ai-box {
  border: 1px solid #e6d5f7;
  background: #fbf7ff;
  border-radius: 8px;
  padding: 0.7rem 0.85rem;
  font-size: 0.85rem;
  margin-bottom: 0.8rem;
}

.grade-ai-box .md-preview {
  font-size: 0.85rem;
}

/* ---------------- 窄屏 ---------------- */

@media (max-width: 640px) {
  .hw-shell {
    padding: 0.75rem;
  }
  .hw-pane-body {
    padding: 0.75rem;
  }
  .hw-editor .CodeMirror-scroll {
    min-height: 18rem;
  }
  .grade-drawer {
    width: 100%;
  }
}