/* ═══════════ es/course/course.css ═══════════
 * 抓包课展示页
 * 依赖：../css/theme.css 变量 + ../index.css 的 intro-top / intro-hero / intro-footer
 * 范围：课程布局、目录、Markdown 正文、翻页、响应式、打印
 */

/* ── 阅读进度条 ── */
.course-progress {
  position: fixed; top: 48px; left: 0; right: 0; height: 2px;
  z-index: 120; pointer-events: none; background: transparent;
}
.course-progress-fill {
  height: 100%; width: 100%;
  background: linear-gradient(90deg, var(--grn), var(--cyn));
  transform-origin: left center; transform: scaleX(0);
  transition: transform .08s linear;
  will-change: transform;
}

/* ── 总体布局 ── */
.course-shell {
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  align-items: start;
  max-width: 1320px;
  margin: 0 auto;
}
.course-main {
  width: 100%;
  max-width: 980px;
  justify-self: center;
  min-width: 0;
  padding: 32px 48px 88px;
}

/* ── 左侧目录 ── */
.course-side {
  position: sticky; top: 48px;
  height: calc(100vh - 48px);
  overflow-y: auto;
  padding: 18px 14px 48px;
  border-right: 1px solid var(--c3);
  background: linear-gradient(180deg, var(--c1), var(--c0) 280px);
  scrollbar-width: thin;
}
.course-side::-webkit-scrollbar { width: 6px; }
.course-side::-webkit-scrollbar-thumb { background: var(--c3); border-radius: 3px; }
.course-side-head {
  position: sticky; top: 0; z-index: 2;
  padding: 2px 0 12px;
  background: var(--c1);
}
.course-side-title {
  display: flex; align-items: baseline; justify-content: space-between;
  font-size: 13px; font-weight: 700; color: var(--fg); letter-spacing: .3px;
}
.course-side-count { font-size: 10px; color: var(--dim); font-weight: 400; }
.course-readbar {
  height: 4px; margin-top: 10px; border-radius: 2px;
  background: var(--c2); overflow: hidden;
}
.course-readbar-fill {
  height: 100%; width: 0;
  background: linear-gradient(90deg, var(--grn), var(--cyn));
  transition: width .2s ease;
}
.course-readtext { margin-top: 6px; font-size: 10px; color: var(--dim); }
.course-search {
  width: 100%; margin-top: 12px; padding: 7px 10px;
  font: inherit; font-size: 12px; color: var(--fg);
  background: var(--c0); border: 1px solid var(--c3); border-radius: 5px;
  outline: none; transition: border-color .15s;
}
.course-search::placeholder { color: var(--soft); }
.course-search:focus { border-color: var(--grn); }
.course-filter { display: flex; gap: 6px; margin-top: 8px; }
.course-filter button {
  flex: 1; padding: 5px 4px;
  font: inherit; font-size: 10px; color: var(--dim);
  background: transparent; border: 1px solid var(--c3); border-radius: 4px;
  cursor: pointer; transition: color .15s, border-color .15s, background .15s;
}
.course-filter button:hover { color: var(--fg); border-color: var(--dim); }
.course-filter button.on {
  color: var(--grn); border-color: var(--grn);
  background: rgba(61,236,85,.08);
}
html.light .course-filter button.on { background: rgba(26,127,55,.08); }

/* 目录模块 */
.course-nav { padding-top: 6px; }
.course-empty {
  padding: 22px 8px; text-align: center;
  color: var(--dim); font-size: 11px;
}
.course-mod { margin-top: 14px; }
.course-mod[hidden] { display: none; }
.course-mod-head {
  display: flex; align-items: center; gap: 8px;
  padding: 4px 8px; margin-bottom: 4px;
  font-size: 10px; color: var(--dim); letter-spacing: .4px;
  text-transform: uppercase;
}
.course-mod-head .mnum {
  display: inline-flex; align-items: center; justify-content: center;
  width: 18px; height: 18px; border-radius: 4px; flex-shrink: 0;
  color: var(--grn); background: rgba(61,236,85,.08);
  border: 1px solid rgba(61,236,85,.25);
  font-size: 9px; letter-spacing: 0;
}
.course-mod-head .mname { color: var(--fg); font-size: 11px; letter-spacing: .2px; }
.course-mod-head .mrange { margin-left: auto; font-size: 9px; color: var(--soft); }
.course-link {
  display: grid;
  grid-template-columns: 24px minmax(0,1fr) auto;
  align-items: center; gap: 8px;
  padding: 6px 8px 6px 10px;
  margin: 1px 0;
  border-left: 2px solid transparent;
  border-radius: 0 4px 4px 0;
  color: var(--dim); text-decoration: none;
  font-size: 12px; line-height: 1.4;
  transition: color .15s, background .15s, border-color .15s;
}
.course-link:hover { color: var(--fg); background: rgba(128,128,128,.06); }
.course-link.active {
  color: var(--grn); background: rgba(61,236,85,.09);
  border-left-color: var(--grn);
}
html.light .course-link.active { background: rgba(26,127,55,.08); }
.course-link[hidden] { display: none; }
.course-link .cnum {
  font-size: 10px; color: var(--soft); text-align: right;
  font-variant-numeric: tabular-nums;
}
.course-link.active .cnum { color: var(--grn); }
.course-link.read .cnum::after {
  content: '·'; color: var(--grn); margin-left: 2px;
}
.course-link .ctitle {
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.course-link .cmin { font-size: 9px; color: var(--soft); }
.course-link.active .cmin { color: var(--grn); }
.course-link .paid-dot {
  display: inline-block; width: 5px; height: 5px; border-radius: 50%;
  background: var(--yel); margin-left: 5px; vertical-align: middle;
  opacity: .85;
}

/* ── 面包屑 ── */
.course-crumb {
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
  margin-bottom: 18px; font-size: 11px; color: var(--dim);
}
.course-crumb a { color: var(--dim); text-decoration: none; }
.course-crumb a:hover { color: var(--cyn); }
.course-crumb .sep { color: var(--soft); }

/* ── Hero（landing） ── */
.course-hero { padding: 56px 24px 48px; }
.course-hero h1 { font-size: clamp(40px, 7vw, 64px); }
.course-hero .stats { margin-top: 36px; }
.course-landing-body { padding: 0 4px; }
.course-landing-head {
  display: flex; align-items: flex-end; justify-content: space-between;
  gap: 16px; flex-wrap: wrap;
  margin: 36px 0 8px;
}
.course-landing-head .eyebrow {
  font-size: 10px; letter-spacing: 2px; color: var(--grn);
  margin-bottom: 6px;
}
.course-landing-head h2 { font-size: 24px; color: var(--fg); line-height: 1.3; }
.course-landing-head .subtitle { margin-top: 6px; font-size: 12px; color: var(--dim); }
.course-resume {
  padding: 7px 14px; font-size: 11px; color: var(--grn);
  border: 1px solid rgba(61,236,85,.35); border-radius: 5px;
  text-decoration: none; white-space: nowrap;
  background: rgba(61,236,85,.06);
}
.course-resume:hover { border-color: var(--grn); box-shadow: var(--glow-g); }
.course-note { margin-top: 24px; }
.course-noscript { margin-top: 24px; }

/* 模块卡片 */
.module-grid {
  display: grid; grid-template-columns: repeat(2, minmax(0,1fr));
  gap: 12px; margin-top: 18px;
}
.module-card {
  display: block; padding: 14px 16px;
  background: var(--c1); border: 1px solid var(--c3); border-radius: 6px;
  color: var(--fg); text-decoration: none;
  transition: border-color .15s, transform .15s, box-shadow .15s;
}
.module-card:hover {
  border-color: var(--grn); transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(0,0,0,.18);
}
.module-card .mnum {
  font-size: 10px; color: var(--grn); letter-spacing: .5px;
}
.module-card h3 { margin: 4px 0 5px; font-size: 14px; color: var(--fg); }
.module-card .mdesc {
  font-size: 11px; line-height: 1.65; color: var(--dim);
  min-height: 36px;
}
.module-card .mfoot {
  display: flex; align-items: center; justify-content: space-between;
  margin-top: 10px; padding-top: 8px; border-top: 1px solid var(--c2);
  font-size: 9px; color: var(--soft);
}
.module-card .mfoot .go { color: var(--cyn); }

/* ── 正文 ── */
.course-article { min-width: 0; }
.lesson-head { margin-bottom: 26px; padding-bottom: 18px; border-bottom: 1px solid var(--c3); }
.lesson-kicker {
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
  font-size: 11px; color: var(--dim);
}
.lesson-kicker .badge {
  display: inline-flex; align-items: center;
  padding: 1px 7px; border-radius: 10px;
  font-size: 9px; line-height: 1.6;
}
.badge.basic { color: var(--grn); background: rgba(61,236,85,.09); border: 1px solid rgba(61,236,85,.3); }
.badge.advanced { color: var(--yel); background: rgba(236,180,61,.09); border: 1px solid rgba(236,180,61,.35); }
.badge.free { color: var(--cyn); background: rgba(61,224,224,.08); border: 1px solid rgba(61,224,224,.3); }
.badge.paid { color: var(--yel); background: rgba(236,180,61,.08); border: 1px solid rgba(236,180,61,.3); }
.lesson-head h1 {
  margin-top: 8px; font-size: clamp(26px, 4.4vw, 38px);
  line-height: 1.25; color: var(--fg); letter-spacing: -.4px;
}
.lesson-goal {
  margin-top: 10px; max-width: 760px;
  font-size: 13px; line-height: 1.75; color: var(--dim);
}
.lesson-toc {
  margin: 18px 0 24px; padding: 10px 14px;
  background: var(--c1); border: 1px solid var(--c3); border-radius: 5px;
  font-size: 11px;
}
.lesson-toc summary {
  cursor: pointer; color: var(--cyn); user-select: none;
  list-style: none;
}
.lesson-toc summary::-webkit-details-marker { display: none; }
.lesson-toc summary::before { content: '▸ '; color: var(--grn); }
.lesson-toc[open] summary::before { content: '▾ '; }
.lesson-toc ol { margin: 8px 0 0 18px; padding: 0; }
.lesson-toc li { margin: 3px 0; }
.lesson-toc li.h3 { margin-left: 16px; }
.lesson-toc a { color: var(--dim); text-decoration: none; }
.lesson-toc a:hover { color: var(--grn); }

/* ── 加载态 ── */
.course-loading {
  display: flex; align-items: center; gap: 10px;
  padding: 56px 0; color: var(--dim); font-size: 13px;
}
.course-spinner {
  width: 14px; height: 14px; flex-shrink: 0;
  border: 2px solid var(--c3); border-top-color: var(--grn);
  border-radius: 50%; animation: courseSpin .8s linear infinite;
}
@keyframes courseSpin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) {
  .course-spinner { animation: none; }
}

/* Markdown 排版 */
.md { font-size: 13.5px; line-height: 1.82; color: var(--fg); }
.md > *:first-child { margin-top: 0; }
.md h1, .md h2, .md h3, .md h4 {
  color: var(--fg); line-height: 1.35; font-weight: 700;
  scroll-margin-top: 64px;
}
.md h1 { margin: 34px 0 14px; font-size: 24px; }
.md h2 {
  margin: 40px 0 14px; padding-bottom: 7px; font-size: 19px;
  border-bottom: 1px solid var(--c3);
}
.md h2::before {
  content: ''; display: inline-block;
  width: 3px; height: 15px; margin-right: 8px;
  background: var(--grn); border-radius: 2px;
  vertical-align: -1px;
}
.md h3 { margin: 28px 0 10px; font-size: 15px; color: var(--cyn); }
.md h4 { margin: 22px 0 8px; font-size: 13.5px; color: var(--yel); }
.md p { margin: 12px 0; }
.md strong { color: var(--wht); font-weight: 700; }
.md em { color: var(--fg); }
.md a { color: var(--cyn); text-decoration: none; border-bottom: 1px dashed rgba(61,224,224,.35); }
.md a:hover { color: var(--grn); border-bottom-color: var(--grn); }
.md ul, .md ol { margin: 12px 0; padding-left: 24px; }
.md li { margin: 5px 0; }
.md li > ul, .md li > ol { margin: 5px 0; }
.md hr { border: 0; border-top: 1px solid var(--c3); margin: 32px 0; }
.md blockquote {
  margin: 16px 0; padding: 10px 14px;
  border-left: 3px solid var(--cyn); border-radius: 0 4px 4px 0;
  background: var(--c1); color: var(--dim);
}
.md blockquote p { margin: 4px 0; }
.md blockquote strong { color: var(--fg); }
.md code {
  padding: 1px 5px; border-radius: 3px;
  font-family: inherit; font-size: 12.5px;
  color: var(--grn); background: var(--c2);
  border: 1px solid rgba(128,128,128,.08);
}
.md pre {
  position: relative;
  margin: 16px 0; padding: 14px 16px;
  overflow-x: auto;
  background: var(--c0); border: 1px solid var(--c3); border-radius: 5px;
  line-height: 1.65;
}
.md pre code {
  padding: 0; color: var(--fg); background: transparent; border: 0;
  font-size: 12.5px; white-space: pre;
}
.code-wrap { position: relative; }
.code-wrap .copy-code {
  position: absolute; top: 6px; right: 6px;
  padding: 3px 8px;
  font: inherit; font-size: 10px; color: var(--dim);
  background: var(--c1); border: 1px solid var(--c3); border-radius: 4px;
  cursor: pointer; opacity: 0; transition: opacity .15s, color .15s, border-color .15s;
}
.code-wrap:hover .copy-code, .code-wrap .copy-code:focus { opacity: 1; }
.code-wrap .copy-code:hover { color: var(--grn); border-color: var(--grn); }
.code-wrap .copy-code.done { color: var(--grn); border-color: var(--grn); opacity: 1; }

/* 表格 */
.table-wrap { margin: 16px 0; overflow-x: auto; border: 1px solid var(--c3); border-radius: 5px; }
.md table { width: 100%; border-collapse: collapse; font-size: 12px; line-height: 1.6; }
.md th, .md td {
  padding: 8px 12px; text-align: left; vertical-align: top;
  border-bottom: 1px solid var(--c3);
}
.md th {
  color: var(--fg); background: var(--c1); font-weight: 700;
  white-space: nowrap;
}
.md td { color: var(--dim); }
.md tbody tr:last-child td { border-bottom: 0; }
.md tbody tr:hover td { background: rgba(128,128,128,.04); }

/* ── 翻页 ── */
.course-pager {
  display: grid; grid-template-columns: 1fr 1fr; gap: 12px;
  margin-top: 48px; padding-top: 20px; border-top: 1px solid var(--c3);
}
.course-pager a {
  display: block; padding: 12px 14px;
  background: var(--c1); border: 1px solid var(--c3); border-radius: 6px;
  color: var(--fg); text-decoration: none;
  transition: border-color .15s, transform .15s;
}
.course-pager a:hover { border-color: var(--grn); transform: translateY(-1px); }
.course-pager a.next { text-align: right; }
.course-pager .plabel { display: block; font-size: 9px; color: var(--dim); margin-bottom: 3px; }
.course-pager .ptitle { font-size: 12px; color: var(--fg); }
.course-pager a.next .ptitle { color: var(--cyn); }
.course-pager .spacer { visibility: hidden; }

/* ── 页脚微调 ── */
.course-footer { margin-top: 40px; }

/* ── 移动端目录 ── */
.course-menu-btn { display: none; }
.course-side-overlay {
  position: fixed; inset: 48px 0 0 0; z-index: 140;
  background: rgba(0,0,0,.55); backdrop-filter: blur(2px);
}
body.side-open { overflow: hidden; }

@media (max-width: 900px) {
  .course-body .intro-top { gap: 8px; padding: 0 10px; }
  .course-body .intro-top .ver { display: none; }
  .course-body .intro-top .brand { font-size: 13px; }
  .course-body .intro-top .actions .btn-icon { padding: 4px 7px; font-size: 11px; }
  .course-shell { display: block; }
  .course-main { padding: 20px 16px 64px; max-width: none; }
  .course-side {
    position: fixed; top: 48px; left: 0; bottom: 0; z-index: 150;
    width: min(86vw, 340px); height: auto;
    border-right: 1px solid var(--c3);
    background: var(--c1);
    transform: translateX(-102%);
    transition: transform .2s ease;
    padding-top: 16px;
  }
  body.side-open .course-side { transform: none; }
  .course-menu-btn { display: inline-flex; }
  .course-back-site { display: none; }
  .course-hero { padding: 40px 12px 36px; }
  .course-hero h1 { font-size: 42px; }
  .course-hero .stats { grid-template-columns: repeat(2, minmax(0,1fr)); gap: 10px; }
  .course-hero .stat { padding: 10px 12px; }
  .course-hero .stat .n { font-size: 22px; }
  .module-grid { grid-template-columns: 1fr; }
  .course-landing-head h2 { font-size: 20px; }
  .course-pager { grid-template-columns: 1fr; }
  .course-pager .spacer { display: none; }
  .course-pager a.next { text-align: left; }
  .course-progress { top: 48px; }
  .lesson-head h1 { font-size: 28px; }
  .md { font-size: 13px; }
  .md h2 { font-size: 17px; }
  .md h3 { font-size: 14px; }
  .code-wrap .copy-code { opacity: 1; }
}

@media (prefers-reduced-motion: reduce) {
  .course-progress-fill, .course-readbar-fill, .module-card, .course-pager a,
  .course-side, .course-link { transition: none; }
}

/* ── 打印 ── */
@media print {
  .intro-top, .course-side, .course-side-overlay, .course-progress,
  .course-pager, .course-footer, .course-menu-btn, .copy-code,
  .course-crumb, .lesson-toc { display: none !important; }
  body.course-body { background: #fff; color: #111; }
  .course-shell { display: block; max-width: none; }
  .course-main { max-width: none; padding: 0; }
  .md, .md p, .md li, .md td { color: #111; }
  .md h1, .md h2, .md h3, .md h4, .md strong { color: #000; }
  .md code, .md pre { background: #f5f5f5; color: #111; border-color: #ccc; }
  .md pre { white-space: pre-wrap; }
  .md a { color: #000; border: 0; }
  .table-wrap { overflow: visible; border-color: #ccc; }
  .md th, .md td { border-color: #ccc; }
}