/* ============================================================
   DeepSeek Harness 实战课程 — 课时与测验样式
   依赖 styles.css 的设计令牌（--canvas/--surface/--accent 等）
   ============================================================ */

/* ---------- 课时头部 ---------- */
.lesson-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0 8px;
}
.meta-pill {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 3px 12px;
  background: var(--surface);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.meta-pill b { color: var(--accent); font-weight: 650; }

.objectives {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 12px;
  padding: 18px 22px;
  margin: 22px 0 8px;
}
.objectives .obj-title {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 10px;
}
.objectives ul { padding-left: 20px; margin: 0; }
.objectives li { font-size: 14.5px; line-height: 1.8; margin-bottom: 4px; }

/* ---------- 课时正文 ---------- */
.lesson-body h3 {
  font-size: 19px;
  margin: 40px 0 10px;
  padding-top: 8px;
}
.lesson-body h4 { font-size: 15.5px; font-weight: 700; color: var(--accent); margin: 24px 0 8px; }
.lesson-body p { font-size: 15px; }
.lesson-body ul, .lesson-body ol { padding-left: 22px; margin: 0 0 14px; max-width: 680px; }
.lesson-body li { font-size: 14.5px; line-height: 1.85; margin-bottom: 5px; }
.lesson-body li > code { white-space: normal; }

/* 要点框 / 陷阱框 */
.callout {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px 18px;
  margin: 18px 0;
  font-size: 14px;
  line-height: 1.8;
  background: var(--surface);
  max-width: 680px;
}
.callout .callout-tag {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  display: block;
  margin-bottom: 6px;
}
.callout p { margin-bottom: 6px; font-size: 14px; }
.callout p:last-child { margin-bottom: 0; }
.callout-trap { background: var(--accent); border-color: var(--accent); color: var(--canvas); }
.callout-trap .callout-tag { color: rgba(247, 245, 243, 0.55); }
.callout-trap p { color: rgba(247, 245, 243, 0.88); }
.callout-trap code { background: rgba(247, 245, 243, 0.12); border-color: transparent; color: var(--canvas); }

/* 动手试一试 */
.try-it {
  border: 1px dashed var(--muted);
  border-radius: 12px;
  padding: 16px 20px;
  margin: 20px 0;
  max-width: 680px;
}
.try-it .try-tag {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 700;
  display: block;
  margin-bottom: 8px;
}
.try-it p { font-size: 14px; margin-bottom: 8px; }
.try-it ol { padding-left: 20px; margin-bottom: 10px; }
.try-it li { font-size: 14px; }
.try-it .cmd { max-width: none; }

/* 代码块 */
.codeblock {
  background: var(--accent);
  border-radius: 12px;
  padding: 14px 18px;
  margin: 14px 0 18px;
  max-width: 680px;
  overflow-x: auto;
}
.codeblock code {
  display: block;
  background: none;
  border: none;
  padding: 0;
  color: #F7F5F3;
  font-size: 13px;
  line-height: 1.9;
  white-space: pre;
}
.codeblock .comment { color: rgba(247, 245, 243, 0.42); }
.codeblock .prompt { color: rgba(247, 245, 243, 0.45); user-select: none; }

/* ---------- 配图 ---------- */
.figure {
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface);
  padding: 22px 22px 14px;
  margin: 22px 0;
  max-width: 720px;
}
.figure svg { display: block; width: 100%; height: auto; }
.figure figcaption {
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--muted);
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px solid var(--border);
}
/* SVG 内部统一用 CSS 变量，保证与主题一致 */
.figure svg .box { fill: var(--canvas); stroke: var(--muted); stroke-width: 1.2; rx: 10; }
.figure svg .box-strong { fill: var(--accent); stroke: var(--accent); }
.figure svg .box-soft { fill: var(--surface-alt); stroke: var(--muted); stroke-width: 1; }
.figure svg text { font-family: var(--sans); fill: var(--text); font-size: 13px; }
.figure svg .t-strong { fill: var(--canvas); font-weight: 650; }
.figure svg .t-mono { font-family: var(--mono); font-size: 11.5px; }
.figure svg .t-muted { fill: var(--muted); font-size: 11px; }
.figure svg .t-title { fill: var(--accent); font-weight: 700; font-size: 13.5px; }
.figure svg .arrow { stroke: var(--muted); stroke-width: 1.4; fill: none; marker-end: url(#arr); }
.figure svg .arrow-dash { stroke: var(--muted); stroke-width: 1.2; fill: none; stroke-dasharray: 5 4; marker-end: url(#arr); }

/* ---------- 测验区 ---------- */
.quiz-section {
  border-top: 2px solid var(--accent);
  margin-top: 56px;
  padding-top: 28px;
}
.quiz-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px 20px;
  margin: 16px 0 24px;
  flex-wrap: wrap;
}
.quiz-banner .qb-left { font-size: 14px; color: var(--text); }
.quiz-banner .qb-left b { color: var(--accent); }
.quiz-banner .qb-score {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--accent);
  font-weight: 700;
  white-space: nowrap;
}
.quiz-banner .qb-score .qb-done { color: var(--muted); font-weight: 400; }

.quiz {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px 20px;
  margin-bottom: 14px;
  transition: border-color 0.15s ease;
}
.quiz.answered { border-color: var(--accent); }
.quiz-head { display: flex; align-items: flex-start; gap: 10px; margin-bottom: 12px; }
.quiz-type {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  border-radius: 999px;
  padding: 2px 10px;
  flex-shrink: 0;
  margin-top: 2px;
  background: var(--accent);
  color: var(--canvas);
}
.quiz-type.t-multi { background: var(--muted); }
.quiz-q { font-size: 15px; font-weight: 650; color: var(--accent); line-height: 1.65; }
.quiz-q code { white-space: normal; }

.opt {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: 9px;
  margin-bottom: 8px;
  cursor: pointer;
  background: var(--canvas);
  font-size: 14px;
  line-height: 1.7;
  transition: border-color 0.15s ease, background 0.15s ease;
}
.opt:hover { border-color: var(--muted); }
.opt input { margin-top: 5px; accent-color: var(--accent); flex-shrink: 0; }
.opt .opt-key { font-family: var(--mono); font-size: 12px; color: var(--muted); flex-shrink: 0; margin-top: 1px; }
.opt .opt-text { flex: 1; }
.opt .opt-text code { white-space: normal; }
.opt .opt-mark { font-family: var(--mono); font-size: 12px; flex-shrink: 0; display: none; }

.quiz.answered .opt { cursor: default; }
.quiz.answered .opt input { pointer-events: none; }
.quiz .opt.is-correct { border-color: #3D7A4E; background: rgba(61, 122, 78, 0.08); }
.quiz .opt.is-correct .opt-mark { display: inline; color: #3D7A4E; }
.quiz .opt.is-wrong { border-color: #A64444; background: rgba(166, 68, 68, 0.07); }
.quiz .opt.is-wrong .opt-mark { display: inline; color: #A64444; }
.quiz .opt.is-missed { border-color: #3D7A4E; border-style: dashed; }
.quiz .opt.is-missed .opt-mark { display: inline; color: #3D7A4E; }

.quiz-submit {
  font-family: var(--mono);
  font-size: 12.5px;
  padding: 7px 18px;
  border-radius: 8px;
  border: none;
  background: var(--accent);
  color: var(--canvas);
  cursor: pointer;
  margin-top: 4px;
  transition: transform 0.15s ease;
}
.quiz-submit:hover { transform: translateY(-1px); }
.quiz-submit:disabled { opacity: 0.4; cursor: default; transform: none; }

.quiz-verdict { font-size: 13.5px; font-weight: 700; margin: 10px 0 0; display: none; }
.quiz-verdict.v-ok { color: #3D7A4E; display: block; }
.quiz-verdict.v-no { color: #A64444; display: block; }

.quiz-explain {
  display: none;
  border-top: 1px solid var(--border);
  margin-top: 12px;
  padding-top: 12px;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--text);
}
.quiz.answered .quiz-explain { display: block; }
.quiz-explain p { font-size: 13.5px; margin-bottom: 6px; }
.quiz-explain p:last-child { margin-bottom: 0; }
.quiz-explain ul { padding-left: 18px; }
.quiz-explain li { font-size: 13.5px; }

/* 问答题 */
details.quiz.q-open { padding: 0; }
details.quiz.q-open summary {
  list-style: none;
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 18px 20px;
  cursor: pointer;
  user-select: none;
}
details.quiz.q-open summary::-webkit-details-marker { display: none; }
details.quiz.q-open .qa-chevron {
  flex-shrink: 0; color: var(--muted); font-family: var(--mono);
  font-size: 13px; margin-top: 4px; transition: transform 0.2s ease;
}
details.quiz.q-open[open] .qa-chevron { transform: rotate(90deg); }
details.quiz.q-open .open-hint { font-family: var(--mono); font-size: 11px; color: var(--muted); flex-shrink: 0; margin-top: 5px; }
details.quiz.q-open[open] .open-hint { display: none; }
details.quiz.q-open .quiz-explain { display: block; border-top: 1px solid var(--border); margin: 0; padding: 14px 20px 18px; }

/* ---------- 课末导航 ---------- */
.lesson-nav {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  margin-top: 56px;
  flex-wrap: wrap;
}
.lesson-nav a {
  flex: 1;
  min-width: 220px;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px 20px;
  text-decoration: none;
  background: var(--surface);
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.lesson-nav a:hover { border-color: var(--accent); transform: translateY(-1px); }
.lesson-nav .ln-dir { font-family: var(--mono); font-size: 11px; color: var(--muted); display: block; margin-bottom: 4px; }
.lesson-nav .ln-title { font-size: 14.5px; font-weight: 650; color: var(--accent); }
.lesson-nav a.ln-next { text-align: right; }

/* ---------- 两级目录（共享规则与紧凑化在 styles.css） ---------- */
.lesson-card { scroll-margin-top: 40px; }

/* ---------- 课程首页 ---------- */
.track-legend { display: flex; gap: 18px; flex-wrap: wrap; margin: 14px 0 6px; font-size: 13px; color: var(--muted); }
.track-legend span { display: inline-flex; align-items: center; gap: 7px; }
.track-legend i { width: 12px; height: 12px; border-radius: 4px; display: inline-block; }
.tl-a { background: var(--accent); }
.tl-b { background: var(--muted); }
.tl-c { background: var(--surface-alt); border: 1px solid var(--muted); }
.tl-d { background: transparent; border: 1.5px dashed var(--muted); }

.module-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 36px 0 6px;
}
.module-head .mod-tag {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--canvas);
  background: var(--accent);
  border-radius: 6px;
  padding: 2px 9px;
}
.module-head .mod-tag.mb { background: var(--muted); }
.module-head .mod-tag.mc { background: var(--surface-alt); color: var(--accent); border: 1px solid var(--muted); }
.module-head .mod-tag.md { background: transparent; color: var(--text); border: 1px dashed var(--muted); }
.module-head h3 { font-size: 19px; margin: 0; }
.module-head .mod-sub { font-size: 13px; color: var(--muted); }

.lesson-card {
  display: flex;
  gap: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px 22px;
  margin-top: 12px;
  text-decoration: none;
  color: var(--text);
  transition: border-color 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
}
a.lesson-card:hover { border-color: var(--accent); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(28, 28, 41, 0.07); }
.lesson-card .lc-num {
  font-family: var(--mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--surface-alt);
  width: 44px;
  flex-shrink: 0;
  padding-top: 2px;
}
.lesson-card.done .lc-num { color: var(--accent); }
.lesson-card .lc-body { flex: 1; }
.lesson-card .lc-title { font-size: 16px; font-weight: 700; color: var(--accent); }
.lesson-card .lc-desc { font-size: 13.5px; line-height: 1.7; margin: 4px 0 0; }
.lesson-card .lc-meta {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--muted);
  margin-top: 8px;
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}
.lesson-card .lc-state {
  flex-shrink: 0;
  align-self: center;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px 12px;
  white-space: nowrap;
  background: var(--canvas);
}
.lesson-card.done .lc-state { background: var(--accent); color: var(--canvas); border-color: var(--accent); }

.grad-standard { margin-top: 10px; }
.grad-standard li { font-size: 14.5px; line-height: 1.85; margin-bottom: 6px; }

@media (max-width: 960px) {
  .lesson-card { flex-direction: column; gap: 8px; }
  .lesson-card .lc-state { align-self: flex-start; }
  .lesson-nav a { min-width: 100%; }
}