/* VuuGrow —— 站点层追加样式，不改 core 的 style.css token。
   频道主题色来自 providers.json 的 accent（取值都是 :root 里已有的颜色），
   由脚本写进 --pa，这里只消费变量。 */

/* ---------- 频道条 ---------- */
.providers {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 14px;
  margin-top: 16px;
}
.provider {
  --pa: var(--accent);
  display: block;
  text-decoration: none;
  color: var(--text);
  padding: 16px 18px;
  border-top: 3px solid var(--pa);
}
.provider:hover { color: var(--text); transform: translateY(-2px); }
.provider b { display: block; font-size: 16px; margin-bottom: 4px; }
.provider p { font-size: 13px; color: var(--muted); margin: 0 0 8px; }
.provider .count { font-size: 12px; color: var(--pa); }

/* 平台示例频道的标识：频道是平台运营的，不是课件作者，这一点要一眼看得到 */
.badge-virtual {
  display: inline-block;
  font-size: 11px;
  color: var(--amber);
  border: 1px solid rgba(244,194,107,.45);
  border-radius: 99px;
  padding: 0 8px;
  margin-left: 6px;
  vertical-align: 2px;
}

/* ---------- 筛选 ---------- */
.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin: 14px 0 4px;
}
.chip {
  font: inherit;
  font-size: 13px;
  color: var(--muted);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 99px;
  padding: 4px 14px;
  cursor: pointer;
}
.chip:hover { color: #fff; }
.chip.active { color: #fff; background: var(--ribbon); border-color: transparent; box-shadow: var(--gloss); }
.filters input[type=search] {
  margin-left: auto;
  min-width: 220px;
  font: inherit;
  font-size: 14px;
  color: var(--text);
  background: #0f1726;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 7px 12px;
  outline: none;
}
.filters input[type=search]:focus { border-color: rgba(42,208,200,.6); }
.result-note { color: var(--muted); font-size: 13px; margin: 6px 0 0; }

/* ---------- 课程卡 ---------- */
.courses {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 16px;
  margin-top: 16px;
}
.course {
  display: flex;
  flex-direction: column;
  padding: 0;
  overflow: hidden;
  text-decoration: none;
  color: var(--text);
}
.course:hover { color: var(--text); transform: translateY(-2px); }
.course img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: var(--panel2);
}
.course .body { padding: 12px 14px 14px; display: flex; flex-direction: column; gap: 6px; flex: 1; }
.course b { font-size: 15px; line-height: 1.4; }
.course .q { font-size: 12.5px; color: var(--muted); line-height: 1.5; }
.course .meta { margin-top: auto; font-size: 12px; color: var(--muted); }
.course .meta .tag { font-size: 11px; padding: 0 8px; margin: 0 4px 0 0; }

/* ---------- 课程页 ---------- */
.crumbs { font-size: 13px; color: var(--muted); margin: 18px 0 0; }
.crumbs a { color: var(--muted); }
.course-head h1 { font-size: 30px; margin: 6px 0 4px; line-height: 1.3; }
.course-head .q { color: var(--muted); font-size: 16px; margin: 0; }

.player {
  position: relative;
  margin-top: 18px;
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
  background: #05080f;
  aspect-ratio: 16 / 9;
}
.player iframe { display: block; width: 100%; height: 100%; border: 0; }
.player .start {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  background-size: cover;
  background-position: center;
  cursor: pointer;
  border: 0;
  font: inherit;
  color: #fff;
}
.player .start::before { content: ""; position: absolute; inset: 0; background: rgba(5,8,15,.55); }
.player .start > * { position: relative; }
.player .start .btn { margin: 0; }
.player .start small { color: #d8dfec; }
.player-bar { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.player-bar .btn { margin: 0; padding: 7px 14px; font-size: 13px; }

.course-cols {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: 18px;
  margin-top: 22px;
}
.steps { counter-reset: step; list-style: none; padding: 0; margin: 8px 0 0; }
.steps li { counter-increment: step; position: relative; padding-left: 34px; margin: 8px 0; }
.steps li::before {
  content: counter(step);
  position: absolute; left: 0; top: 1px;
  width: 22px; height: 22px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; color: #fff; background: var(--panel2); border: 1px solid var(--line);
}
.steps li:last-child::before { background: var(--ribbon); border-color: transparent; }
.textbook { font-size: 13.5px; color: #d8dfec; }
.textbook li { margin: 4px 0; }

.credit { font-size: 13.5px; }
.credit dl { display: grid; grid-template-columns: 76px 1fr; gap: 6px 10px; margin: 8px 0 0; }
.credit dt { color: var(--muted); }
.credit dd { margin: 0; color: #d8dfec; word-break: break-word; }

.provider-head { --pa: var(--accent); border-top: 3px solid var(--pa); margin-top: 18px; }
.provider-head h1 { font-size: 28px; margin: 0 0 4px; }
.provider-head .sub { color: var(--muted); margin: 0; }

.empty { color: var(--muted); padding: 30px 0; text-align: center; }

@media (max-width: 860px) {
  .course-cols { grid-template-columns: 1fr; }
  .filters input[type=search] { margin-left: 0; min-width: 0; width: 100%; }
  .course-head h1 { font-size: 24px; }
}

/* ---------- 知识图谱 ---------- */
.graph-card {
  --pa: var(--accent);
  display: flex; flex-direction: column; gap: 6px;
  text-decoration: none; color: var(--text);
  border-top: 3px solid var(--pa);
  padding: 16px 18px;
}
.graph-card:hover { color: var(--text); transform: translateY(-2px); }
.graph-card b { font-size: 16px; }
.graph-card .q { font-size: 13px; color: var(--muted); }
.graph-card .meta { font-size: 12px; color: var(--pa); }

details.grade {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel);
  padding: 10px 16px;
  margin-top: 10px;
}
details.grade summary { cursor: pointer; font-size: 15px; }
details.grade summary span { color: var(--muted); font-size: 12px; }
details.grade h4 { margin: 14px 0 4px; font-size: 13.5px; color: var(--teal-lite); font-weight: 600; }
.topic-list { columns: 2 260px; column-gap: 24px; margin: 0; padding-left: 18px; }
.topic-list li { break-inside: avoid; margin: 3px 0; font-size: 14px; }
.topic-list a { color: #dce7ff; text-decoration: none; }
.topic-list a:hover { color: var(--teal-lite); text-decoration: underline; }
.topic-list small, .rel-list small { color: var(--muted); }

.rel-list { list-style: none; padding: 0; }
.rel-list li { margin: 10px 0; }
.rel-list .reason { font-size: 12.5px; color: var(--muted); margin-top: 2px; }
.tag.hard { color: var(--amber); background: rgba(244,194,107,.12); border-color: rgba(244,194,107,.4); }
.tag.soft { color: var(--muted); background: transparent; border-color: var(--line); }

.disclaimer-ai {
  font-size: 12.5px;
  color: var(--amber);
  border-left: 3px solid var(--amber);
  padding: 4px 10px;
  margin: 12px 0 6px;
}
.check { display: inline-flex; align-items: center; gap: 4px; font-size: 13.5px; color: var(--muted); cursor: pointer; }

/* ---------- 题目卡 ---------- */
.qcard { border: 1px solid var(--line); border-radius: 12px; background: #0f1726; padding: 14px 16px; margin: 10px 0; }
.q-prompt { font-size: 15.5px; color: var(--text); margin: 0 0 10px; white-space: pre-wrap; }
.q-fig { display: block; max-width: 260px; max-height: 200px; background: #fff; border-radius: 8px; padding: 6px; margin: 6px 0; color: #111; }
.q-input { display: flex; flex-direction: column; gap: 6px; }
.q-choice {
  font: inherit; font-size: 14.5px; text-align: left;
  color: var(--text); background: var(--panel); border: 1px solid var(--line);
  border-radius: 10px; padding: 9px 12px; cursor: pointer; min-height: 44px;
}
.q-choice b { color: var(--teal-lite); margin-right: 4px; }
.q-choice.picked { border-color: var(--teal); background: rgba(42,208,200,.12); }
.q-choice .q-fig { max-width: 140px; max-height: 110px; }
.q-text {
  font: inherit; font-size: 15px; color: var(--text); background: var(--panel);
  border: 1px solid var(--line); border-radius: 10px; padding: 9px 12px; outline: none; max-width: 320px;
}
.q-text:focus { border-color: rgba(42,208,200,.6); }
.q-bar { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-top: 10px; }
.q-bar .btn { margin: 0; padding: 7px 14px; font-size: 13.5px; }
.btn[disabled] { opacity: .5; cursor: default; }
.q-feedback p { margin: 6px 0; font-size: 14px; }
.q-feedback .ok, .ok { color: var(--green); }
.q-feedback .bad, .bad { color: #ff8a8a; }
.q-expl { color: var(--muted); }

/* ---------- 诊断 ---------- */
.diag-stage { margin-top: 14px; }
.diag-stage .card { margin-top: 14px; }
.diag-weak { border-top: 3px solid #ff8a8a; }
.diag-path { border-top: 3px solid var(--accent); }
.diag-shaky { border-top: 3px solid var(--amber); }
.diag-ok { border-top: 3px solid var(--green); }

/* ---------- 错题本 ---------- */
.nb-item { margin-top: 12px; }
.nb-item.done { opacity: .72; }
.nb-head { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; font-size: 13.5px; }
.nb-head .tag { margin: 0; }
.nb-meta { color: var(--muted); }
.nb-choices { list-style: none; padding: 0; font-size: 14px; }
.nb-item details summary { cursor: pointer; color: var(--teal-lite); font-size: 13.5px; }
.nb-form { margin-top: 18px; }
.nb-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; margin: 10px 0 14px; }
.nb-grid label { display: flex; flex-direction: column; gap: 4px; font-size: 12.5px; color: var(--muted); }
.nb-grid .wide { grid-column: 1 / -1; }
.nb-grid input, .nb-grid select, .nb-grid textarea {
  font: inherit; font-size: 14px; color: var(--text); background: #0f1726;
  border: 1px solid var(--line); border-radius: 10px; padding: 8px 10px; outline: none;
}
.print-area { display: none; }

@media (max-width: 860px) {
  .nb-grid { grid-template-columns: 1fr; }
}

/* 打印只出卷子：页头、列表、按钮全部隐藏 */
@media print {
  body { background: #fff; color: #000; }
  .shell > *:not(.print-area) { display: none !important; }
  .print-area { display: block; font-size: 13pt; line-height: 1.6; }
  .print-area h1 { font-size: 18pt; margin: 0 0 4px; }
  .print-q { break-inside: avoid; margin: 14px 0; }
  .print-q small { color: #555; }
  .print-blank { height: 70px; border-bottom: 1px dashed #bbb; }
  .print-break { break-before: page; }
  .print-area .q-fig { background: none; padding: 0; max-width: 200px; }
}

/* 页脚正文里的内联链接不要 core 给导航链接的右边距 */
.site-foot span a { margin-right: 0; color: #9fbaff; }