/* ===== signal0 AI 课程 =====
 * 颜色、字体、顶栏基础样式来自 /shared/theme.css；这里只写课程站自己的部分。
 * 导航和窄屏顶栏的写法照搬 CCA-F（cca-f/assets/styles.css），两边手感一致。 */

html { scroll-behavior: smooth; }
code, pre, kbd { font-family: var(--mono); }

/* ---------- 顶栏导航 ---------- */
.nav { display: flex; align-items: center; gap: 4px; margin-left: auto; }
.nav a {
  padding: 7px 13px; border-radius: 7px; text-decoration: none;
  font-size: 14px; color: var(--ink-2); white-space: nowrap;
}
.nav a:hover { background: var(--paper-2); color: var(--ink); }
.nav a.on { background: var(--ink); color: var(--paper); }

.account-chip {
  display: inline-flex; align-items: center; max-width: 140px;
  padding: 6px 12px; border-radius: 20px; border: 1px solid var(--line);
  font-size: 13px; color: var(--ink-2); text-decoration: none;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.account-chip:hover { background: var(--paper-2); color: var(--ink); border-color: var(--accent); }
.account-chip.signed { color: var(--ink); }
.account-chip.signed::before { content: "●"; color: var(--ok); font-size: 9px; margin-right: 6px; }

@media (max-width: 820px) {
  .topbar { height: auto; flex-wrap: wrap; gap: 10px; padding: 9px 14px 0; }
  .brand { flex: 1 1 0; min-width: 0; gap: 8px; }
  .nav {
    order: 3; width: 100%; margin-left: 0; gap: 2px;
    padding: 1px 14px 7px; margin-inline: -14px;
    overflow-x: auto; scrollbar-width: none;
  }
  .nav::-webkit-scrollbar { display: none; }
  .nav a { padding: 6px 10px; font-size: 13.5px; }
}
@media (max-width: 560px) {
  .brand { flex: 0 0 auto; }
  .brand-text b { white-space: nowrap; }
  .brand-text em { display: none; }
  .topbar-tools { margin-left: auto; gap: 6px; }
  .account-chip { max-width: none; padding-inline: 8px; }
}

/* ---------- 布局 ---------- */
main { max-width: 1060px; margin: 0 auto; padding: 36px 22px 72px; }
/* 路由切换时把焦点移到 main（读屏器从新内容开始读），但不画焦点框 */
main:focus, main:focus-visible { outline: none; }
@media (max-width: 560px) { main { padding: 22px 15px 56px; } }

h1 { margin: 0 0 8px; font: 500 clamp(28px, 4.4vw, 40px)/1.3 var(--serif); }
.section-title { margin: 44px 0 14px; font: 500 20px/1.4 var(--serif); }
.eyebrow { margin: 0 0 12px; color: var(--ink-3); font: 12px var(--mono); letter-spacing: .12em; }
.intro { margin: 10px 0 24px; color: var(--ink-2); max-width: 62ch; }
.muted { color: var(--ink-3); }
.small { font-size: 12.5px; }

.course-attribution { margin:40px 0 0; max-width:72ch; color:var(--ink-3); font-size:12.5px; }
.noscript { text-align: center; padding: 40px; }

/* ---------- 卡片 ---------- */
.card {
  display: flex; flex-direction: column; align-items: flex-start;
  padding: 22px 22px 18px; border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--paper-2); box-shadow: var(--shadow); text-decoration: none; color: inherit;
  transition: border-color .15s ease-out, transform .15s ease-out;
}
a.card:hover { border-color: var(--accent); }
a.card:active { transform: scale(.99); }
.card h3 { margin: 8px 0 6px; font: 500 20px/1.4 var(--serif); }
.card p { margin: 0 0 18px; font-size: 14px; }
.price { font-weight: 600; color: var(--accent-strong); }
.price.big { font-size: 26px; font-family: var(--serif); }
s.muted { font-size: 13px; margin-left: 4px; }

.badge {
  display: inline-block; padding: 1px 9px; border-radius: 20px; font-size: 12px;
  background: var(--paper-3); color: var(--ink-2); white-space: nowrap;
}
.badge.ok { background: var(--ok-bg); color: var(--ok); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 7px;
  padding: 9px 17px; border-radius: 8px; border: 1px solid var(--line);
  background: var(--paper); color: var(--ink); font: inherit; font-size: 14px;
  cursor: pointer; text-decoration: none; white-space: nowrap;
  transition: background-color .13s ease-out, transform .1s ease-out;
}
.btn:hover { background: var(--paper-3); }
.btn:active { transform: scale(.97); }
.btn-primary { background: var(--accent-strong); border-color: var(--accent-strong); color: var(--on-accent); }
.btn-primary:hover { background: var(--accent-strong); filter: brightness(.94); }
.btn:disabled { opacity: .5; cursor: progress; }
.linkish {
  background: none; border: 0; padding: 0; font: inherit; color: var(--accent-strong);
  cursor: pointer; text-decoration: underline; text-underline-offset: 3px;
}

/* ---------- 提示 ---------- */
.flash { padding: 11px 14px; border-radius: 8px; margin: 0 0 18px; font-size: 14px; }
.flash-ok { background: var(--ok-bg); color: var(--ok); }
.flash-bad { background: var(--bad-bg); color: var(--bad); }
.flash-info { background: var(--info-bg); color: var(--info); }

/* ---------- 课程页 ---------- */
.crumbs { font-size: 13px; color: var(--ink-3); margin-bottom: 18px; }
.crumbs a { color: var(--ink-2); }
.course-layout { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 36px; align-items: start; }
@media (max-width: 860px) { .course-layout { grid-template-columns: 1fr; } }
.companion {
  padding: 12px 14px; border-left: 3px solid var(--accent); background: var(--paper-2);
  border-radius: 0 8px 8px 0; font-size: 14px;
}

.lesson-list { list-style: none; padding: 0; margin: 18px 0 0; border-top: 1px solid var(--line); }
.lesson-row {
  display: flex; align-items: center; gap: 14px; padding: 13px 6px;
  border-bottom: 1px solid var(--line); text-decoration: none; color: inherit;
}
.lesson-row:hover { background: var(--paper-2); }
.lesson-no { font: 12px var(--mono); color: var(--ink-3); width: 22px; }
.lesson-title { flex: 1; }
.lesson-row.is-done .lesson-title { color: var(--ink-2); }
.lock { font-size: 13px; opacity: .7; }
.stack { display: flex; flex-direction: column; border-top: 1px solid var(--line); margin-top: 14px; }

.buy-box {
  position: sticky; top: 84px;
  padding: 20px; border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--paper-2); box-shadow: var(--shadow);
}
.buy-box .flash { font-size: 13px; }
.buy-main { display: flex; flex-direction: column; gap: 12px; }
.buy-main .btn { width: 100%; }
.buy-alt {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  margin-top: 16px; padding-top: 14px; border-top: 1px solid var(--line); font-size: 14px;
}
.buy-alt p { margin: 2px 0 0; }
.buy-box > p { margin: 14px 0 0; }
@media (max-width: 860px) { .buy-box { position: static; } }

/* ---------- 阅读 ---------- */
.lesson-h1 { margin-bottom: 26px; }
.prose { max-width: 70ch; font-size: 16px; line-height: 1.85; }
.prose h2 { font: 500 22px/1.4 var(--serif); margin: 38px 0 12px; }
.prose h3 { font-size: 17px; margin: 28px 0 10px; }
.prose p, .prose ul, .prose ol { margin: 0 0 16px; }
.prose li { margin: 4px 0; }
.prose a { color: var(--accent-strong); }
.prose code {
  background: var(--paper-3); border: 1px solid var(--line);
  padding: 1px 5px; border-radius: 4px; font-size: .86em;
}
.prose pre {
  background: var(--code-bg); border: 1px solid var(--line); border-radius: 8px;
  padding: 14px 16px; overflow-x: auto; font-size: 13.5px; line-height: 1.6;
}
.prose pre code { background: none; border: 0; padding: 0; font-size: inherit; }
.prose table { border-collapse: collapse; width: 100%; margin: 0 0 18px; font-size: 14px; display: block; overflow-x: auto; }
.prose th, .prose td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; vertical-align: top; }
.prose th { background: var(--paper-2); }
.prose blockquote { margin: 0 0 16px; padding: 4px 16px; border-left: 3px solid var(--line); color: var(--ink-2); }

.quiz {
  margin: 26px 0; padding: 18px 20px; border: 1px solid var(--line);
  border-radius: var(--radius); background: var(--paper-2);
}
.quiz-tag { margin: 0 0 4px; font: 11.5px var(--mono); color: var(--accent-strong); letter-spacing: .08em; }
.quiz-q { margin: 0 0 12px; font-weight: 600; }
.quiz-opts { display: flex; flex-direction: column; gap: 8px; }
.quiz-opt {
  display: flex; align-items: flex-start; gap: 10px; text-align: left;
  padding: 10px 12px; border-radius: 8px; border: 1px solid var(--line);
  background: var(--paper); color: var(--ink); font: inherit; font-size: 14.5px; cursor: pointer;
  transition: border-color .12s ease-out;
}
.quiz-opt:hover:not(:disabled) { border-color: var(--accent); }
.quiz-opt:disabled { cursor: default; }
.quiz-opt.right { border-color: var(--ok); background: var(--ok-bg); }
.quiz-opt.wrong { border-color: var(--bad); background: var(--bad-bg); }
.quiz-key { font: 12px var(--mono); color: var(--ink-3); padding-top: 3px; }
.quiz-explain { margin: 12px 0 0; font-size: 14px; }
.quiz-explain.ok { color: var(--ok); }
.quiz-explain.bad { color: var(--bad); }

.lesson-done { margin: 32px 0 8px; }
.pager {
  display: flex; justify-content: space-between; gap: 16px; margin-top: 28px;
  padding-top: 18px; border-top: 1px solid var(--line); font-size: 14px;
}
.pager a { color: var(--ink-2); text-decoration: none; }
.pager a:hover { color: var(--accent-strong); }

.paywall {
  text-align: center; padding: 34px 20px; margin-bottom: 20px;
  border: 1px dashed var(--line); border-radius: var(--radius);
}
.lock-big { font-size: 30px; margin: 0 0 8px; }

/* ---------- 表单 ---------- */
.form { display: flex; flex-direction: column; gap: 10px; max-width: 440px; align-items: stretch; }
.form p { margin: 0; }
.form label { font-size: 13px; color: var(--ink-2); }
.form input {
  font: inherit; padding: 10px 12px; border-radius: 8px;
  border: 1px solid var(--line); background: var(--paper); color: var(--ink);
}
.form input:focus { outline: 2px solid var(--accent); outline-offset: 0; border-color: transparent; }
.form .row { display: flex; gap: 8px; }
.form-msg { font-size: 13px; min-height: 1em; }
.form-msg.bad { color: var(--bad); }
.form-msg.ok { color: var(--ok); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .card, .btn, .quiz-opt { transition: none; }
  a.card:active, .btn:active { transform: none; }
}

/* ---------- 课程介绍 ---------- */
.companion { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.companion .btn { flex: 0 0 auto; }
.companion-title { display: block; margin: 4px 0; font-size: 18px; }
@media (max-width: 560px) { .companion { flex-direction: column; align-items: stretch; } }
.course-intro { margin: 26px 0 8px; }
.course-intro.prose h2, .course-intro .prose h2 { font-size: 18px; margin: 26px 0 10px; }
.course-intro.prose > h2:first-child { margin-top: 0; }
details.course-intro { border: 1px solid var(--line); border-radius: var(--radius); padding: 10px 16px; }
details.course-intro summary { cursor: pointer; color: var(--ink-2); font-size: 14px; }
details.course-intro[open] summary { margin-bottom: 8px; }
.lesson-row.is-planned { color: var(--ink-3); cursor: default; }
.lesson-row.is-planned:hover { background: none; }

/* ---------- 阅读工作区 ---------- */
:root { --reading-top: 60px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }
main.is-reading { max-width: 1520px; padding: 32px 40px 72px; }
.reading-layout { display: grid; grid-template-columns: 260px minmax(0, 1fr); gap: clamp(32px, 4.4vw, 72px); align-items: start; }
.reading-main { min-width: 0; width: 100%; max-width: 72em; margin-inline: auto; }
.reading-main .prose { max-width: none; font-size: 17px; line-height: 1.95; overflow-wrap: anywhere; }
.reading-header { padding: 12px 0 28px; border-bottom: 1px solid var(--line); margin-bottom: 30px; }
.reading-header .eyebrow { color: var(--accent-strong); margin-bottom: 14px; }
.reading-header .lesson-h1 { max-width: 24em; margin-bottom: 18px; font-size: clamp(28px, 2.6vw, 38px); line-height: 1.4; text-wrap: balance; }
.lesson-meta { color: var(--ink-3); font-size: 13px; line-height: 1.9; margin: 0; }
.reading-main .crumbs { margin: 0; overflow-wrap: anywhere; }
.reading-progress { position: fixed; top: var(--reading-top); inset-inline: 0; height: 2px; z-index: 51; pointer-events: none; }
.reading-progress > span { display: block; height: 100%; background: var(--accent); transform: scaleX(var(--progress, 0)); transform-origin: left; }
.reading-sidebar { position: sticky; top: calc(var(--reading-top) + 26px); max-height: calc(100dvh - var(--reading-top) - 50px); overflow-y: auto; scrollbar-width: thin; scrollbar-color: var(--line) transparent; padding-right: 16px; border-right: 1px solid var(--line); }
.toc-course { display: block; font: 500 19px/1.6 var(--serif); text-decoration: none; padding: 0 8px; }
.toc-progress { font-size: 12px; color: var(--ink-3); margin: 10px 8px 8px; }
.course-progress-track { height: 3px; margin: 0 8px 20px; background: var(--paper-3); border-radius: 3px; overflow: hidden; }
.course-progress-track span { display: block; height: 100%; background: var(--accent); transform: scaleX(var(--progress, 0)); transform-origin: left; }
.toc-lessons, .toc-sections { list-style: none; padding: 0; margin: 0; }
.toc-lessons > li { margin: 3px 0; }
.toc-lesson { display: flex; align-items: baseline; gap: 9px; padding: 9px 8px; border-radius: 6px; font-size: 13px; line-height: 1.65; color: var(--ink-2); text-decoration: none; transition: background-color 150ms ease-out, color 150ms ease-out; }
.toc-lesson:hover { background: var(--paper-2); color: var(--ink); }
.toc-lesson[aria-current="page"] { background: var(--paper-2); color: var(--accent-strong); font-weight: 600; box-shadow: inset 2px 0 var(--accent); }
.toc-number { color: var(--ink-3); font: 11px var(--mono); flex: 0 0 17px; }
.toc-title { flex: 1; overflow-wrap: anywhere; }
.toc-title small { display: block; color: var(--ink-3); font-size: 11px; font-weight: 400; }
.toc-status { font-size: 11px; color: var(--ok); }
.toc-description { margin: 8px 9px 12px 34px; font-size: 12px; color: var(--ink-3); line-height: 1.7; }
.toc-sections { margin: 8px 0 14px 34px; border-left: 1px solid var(--line); }
.toc-sections:empty { display: none; }
.toc-sections a { display: block; padding: 5px 9px; color: var(--ink-3); font-size: 12px; text-decoration: none; line-height: 1.55; }
.toc-sections a:hover, .toc-sections a[aria-current="location"] { color: var(--accent-strong); }
.toc-sections a[aria-current="location"] { box-shadow: -2px 0 var(--accent); }
.reading-mobile-bar { display: none; }
.reading-section { margin: 36px 0; scroll-margin-top: calc(var(--reading-top) + 30px); }
.reading-section:focus { outline: none; }
.reading-section > h2 { margin-top: 0; display: flex; align-items: baseline; gap: 12px; }
.heading-anchor { flex-shrink: 0; font: 14px var(--mono); opacity: 0; text-decoration: none; transition: opacity 150ms ease-out; }
h2:hover .heading-anchor, .heading-anchor:focus-visible { opacity: 1; }
.module-label { display: block; font-size: 12px; color: var(--accent-strong); font-weight: 500; letter-spacing: .06em; margin-bottom: 10px; }
.module-overview { padding: 15px 20px; background: var(--paper-2); border: 1px solid var(--line); border-radius: 8px; font-size: 14px; }
.module-overview summary { font-size: 12px; color: var(--ink-2); cursor: pointer; font-weight: 600; }
.module-overview[open] summary { margin-bottom: 12px; }
.prose .module-overview blockquote { border: 0; padding: 0; margin: 0; }
.prose .module-overview blockquote > :last-child { margin-bottom: 0; }
.module-takeaways { padding: 24px 26px; background: var(--paper-2); border-radius: 8px; }
.module-takeaways > ul { list-style: none; padding: 0; }
.module-takeaways > ul > li { position: relative; padding-left: 25px; }
.module-takeaways > ul > li::before { content: '✓'; color: var(--accent-strong); position: absolute; left: 0; }
.module-exercise { border: 1px solid var(--accent); border-radius: 8px; padding: 24px 26px; }
.prose .exercise-criteria { padding: 14px 16px; border-left: 2px solid var(--accent); background: var(--paper-2); font-size: 15px; }
.quiz-score { font: 13px/1.8 var(--mono); color: var(--ink-3); }
.module-quiz .quiz { margin: 16px 0; }
.quiz-opt { transition: border-color 150ms ease-out, background-color 150ms ease-out; }
.module-recap { padding: 26px; border-top: 3px double var(--accent); border-bottom: 1px solid var(--line); background: var(--paper-2); }
.module-source { padding: 18px 20px; border: 1px solid var(--line); border-radius: 8px; color: var(--ink-3); font-size: 13px; }
.prose .module-source h2 { color: var(--ink-2); font-size: 16px; }
.module-takeaways > :last-child, .module-exercise > :last-child, .module-recap > :last-child, .module-source > :last-child { margin-bottom: 0; }
.code-block { min-width: 0; margin: 20px 0; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; background: var(--code-bg); }
.code-toolbar { display: flex; align-items: center; justify-content: space-between; padding: 7px 12px; border-bottom: 1px solid var(--line); color: var(--ink-3); font: 12px var(--mono); }
.code-copy { border: 1px solid var(--line); border-radius: 5px; padding: 4px 10px; background: var(--paper); color: var(--ink-2); cursor: pointer; font: 12px var(--sans); min-width: 60px; }
.code-copy:hover { border-color: var(--accent); color: var(--ink); }
.prose .code-block pre { border: 0; border-radius: 0; margin: 0; max-width: 100%; }
.table-scroll { width: 100%; overflow-x: auto; margin: 22px 0; border: 1px solid var(--line); border-radius: 8px; }
.prose .table-scroll table { display: table; margin: 0; border-style: hidden; min-width: 500px; }
.prose th { color: var(--ink); font-weight: 600; }
.prose td, .prose th { padding: 12px 14px; }
.reading-end { margin-top: 44px; border-top: 1px solid var(--line); padding-top: 28px; }
.reading-end .lesson-done { margin: 0 0 26px; }
.lesson-done .btn { min-height: 48px; padding: 12px 26px; font-size: 16px; }
.lesson-done .btn[aria-pressed="true"] { background: var(--paper-2); border-color: var(--ok); color: var(--ok); }
.lesson-done p { margin: 9px 0 0; }
.next-lesson { display: grid; grid-template-columns: 1fr auto; gap: 6px 20px; padding: 22px 24px; border: 1px solid var(--line); border-radius: 8px; text-decoration: none; transition: border-color 150ms ease-out; }
.next-lesson:hover { border-color: var(--accent); }
.next-lesson .module-label { grid-column: 1 / -1; margin: 0; }
.next-lesson strong { font: 500 21px/1.5 var(--serif); overflow-wrap: anywhere; }
.next-lesson > span:last-child { color: var(--ink-3); font-size: 12px; align-self: center; }
.keyboard-hint { text-align: right; }
.reading-main .paywall { text-align: left; border: 1px solid var(--line); padding: 30px; background: var(--paper-2); }
.paywall h2, .planned-lesson h2 { font: 500 25px/1.5 var(--serif); margin: 12px 0; }
.paywall-description { color: var(--ink); font-size: 17px; }
.course-facts { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; list-style: none; padding: 20px 0; margin: 22px 0; border-block: 1px solid var(--line); font-size: 13px; color: var(--ink-2); }
.course-facts b { font: 500 23px var(--serif); color: var(--ink); }
.planned-lesson { padding: 30px; border: 1px dashed var(--line); border-radius: 8px; }
.reading-skeleton { padding: 14px 0; }
.reading-skeleton > span:not(.sr-only) { display: block; height: 18px; margin: 22px 0; background: var(--paper-2); border-radius: 5px; }
.reading-skeleton > span:nth-child(3) { width: 82%; }
.reading-skeleton > span:nth-child(4) { width: 93%; }
.reading-skeleton > span:nth-child(5) { width: 60%; }
.reading-drawer { position: fixed; inset: 0 auto 0 0; margin: 0; padding: 18px; width: min(340px, calc(100vw - 32px)); height: 100dvh; max-height: none; max-width: none; border: 0; border-right: 1px solid var(--line); background: var(--paper); color: var(--ink); overflow-y: auto; transform: translateX(-100%); transition: transform 180ms ease-out, display 180ms allow-discrete, overlay 180ms allow-discrete; }
.reading-drawer[open] { transform: translateX(0); }
@starting-style { .reading-drawer[open] { transform: translateX(-100%); } }
.reading-drawer::backdrop { background: rgb(0 0 0 / .4); }
.drawer-close { display: block; margin: 0 0 20px auto; }
body.reading-drawer-open { overflow: hidden; }
@media (max-width: 1023px) {
  main.is-reading { padding: 0 28px 56px; }
  .reading-layout { display: block; }
  .reading-sidebar { display: none; }
  .reading-main { max-width: 760px; }
  .reading-mobile-bar { display: flex; align-items: center; justify-content: space-between; padding: 14px 0 24px; color: var(--ink-3); font-size: 12px; }
  .reading-header { padding-top: 16px; }
  .heading-anchor { opacity: 1; }
  .keyboard-hint { display: none; }
}
@media (max-width: 560px) {
  main.is-reading { padding-inline: 18px; }
  .reading-main .prose { font-size: 16px; line-height: 1.9; }
  .reading-header { margin-bottom: 24px; padding-bottom: 24px; }
  .reading-header .lesson-h1 { font-size: 28px; }
  .reading-section { margin: 28px 0; }
  .prose .reading-section > h2 { font-size: 21px; }
  .module-overview, .module-takeaways, .module-exercise, .module-recap, .module-source { padding: 18px; }
  .reading-main .paywall, .planned-lesson { padding: 22px 18px; }
  .quiz { padding: 16px 14px; }
  .next-lesson { grid-template-columns: 1fr; padding: 20px; }
  .lesson-done .btn { width: 100%; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}
.is-reading .btn { transition: background-color 150ms ease-out; }
.is-reading .btn:active { transform: none; }

/* Checkout summary */
/* Public course details: metadata only; lesson content stays behind access checks. */
.purchase-page { max-width:720px; margin:0 auto 32px; }
.purchase-page--detail { max-width:none; display:grid; grid-template-columns:minmax(0,1fr) 320px; column-gap:48px; align-items:start; }
.purchase-back { display:inline-block; grid-column:1 / -1; justify-self:start; margin:0 0 32px; }
.purchase-hero .module-label { margin:0 0 16px; color:var(--accent-strong); font-size:13px; font-weight:600; }
.purchase-hero h1 { font-size:clamp(30px,3.4vw,44px); line-height:1.15; text-wrap:balance; }
.sales-headline { margin:24px 0 10px; font-size:20px; line-height:1.65; font-weight:500; }
.purchase-hero .intro { font-size:15px; line-height:1.9; margin:0 0 22px; }
.sales-facts { display:flex; flex-wrap:wrap; gap:8px 18px; list-style:none; padding:16px 0; margin:0; border-block:1px solid var(--line); color:var(--ink-2); font-size:12px; }
.sales-directory-link { display:inline-flex; align-items:center; gap:12px; min-height:44px; padding:0; margin-top:14px; background:none; border:0; color:var(--accent-strong); font:inherit; font-size:14px; cursor:pointer; }
.sales-credit { margin:18px 0 0; font-size:12px; line-height:1.8; color:var(--ink-3); }
.sales-credit span { display:block; }
.purchase-card { padding:26px; border:1px solid var(--line); border-radius:14px; background:var(--paper-2); }
.purchase-page--detail .purchase-card { grid-column:2; grid-row:2 / 4; position:sticky; top:88px; }
.purchase-card .eyebrow { font-size:10px; letter-spacing:.08em; margin:0 0 14px; }
.purchase-card h2 { margin:0; font-size:18px; font-weight:500; line-height:1.6; }
.purchase-summary { display:flex; flex-direction:column; align-items:stretch; gap:20px; margin:20px 0; }
.purchase-summary .price.big { font-size:36px; line-height:1.2; }
.purchase-summary p { margin:8px 0 0; }
.purchase-summary .btn { min-height:46px; width:100%; font-weight:600; }
.purchase-recovery { margin:0 0 24px; padding:14px 16px; border:1px solid var(--line); border-radius:8px; font-size:13px; }
.purchase-recovery p { margin:0; }
.purchase-recovery a { display:inline-flex; align-items:center; min-height:44px; color:var(--accent-strong); font-weight:500; text-underline-offset:3px; }
.purchase-card .small { line-height:1.8; overflow-wrap:anywhere; }
.sales-delivery { list-style:none; padding:0 0 18px; margin:0 0 18px; border-bottom:1px solid var(--line); }
.sales-delivery li { display:flex; gap:9px; font-size:13px; line-height:1.7; margin:10px 0; }
.sales-delivery li > span { color:var(--ok); flex-shrink:0; }
.sales-payment-help { font-size:13px; margin-top:16px; }
.sales-payment-help summary { cursor:pointer; min-height:44px; align-content:center; }
.purchase-steps { padding-left:20px; margin:6px 0 14px; color:var(--ink-2); font-size:13px; line-height:1.9; }
.purchase-bundle-link { display:block; margin-top:18px; padding-top:18px; border-top:1px solid var(--line); text-decoration:none; color:var(--ink); }
.purchase-bundle-link > span { display:block; font-size:12px; color:var(--ink-2); }
.purchase-bundle-link strong { display:block; font-size:14px; font-weight:500; margin-top:6px; }
.purchase-bundle-link small { display:block; margin-top:8px; color:var(--ink-3); font-size:12px; line-height:1.7; }
.purchase-details { grid-column:1; min-width:0; }
.sales-section { margin-top:44px; padding-top:32px; border-top:1px solid var(--line); }
.sales-section h2 { margin:0 0 22px; font-size:23px; font-weight:500; line-height:1.5; }
.sales-section .eyebrow { margin-bottom:10px; font-size:10px; }
.sales-outcome { display:flex; gap:18px; margin:24px 0; }
.sales-number { font:12px/1.8 var(--mono); color:var(--ink-3); flex-shrink:0; }
.sales-outcome h3 { margin:0 0 6px; font-size:16px; font-weight:500; }
.sales-outcome p, .sales-prerequisite, .sales-section-intro { font-size:14px; color:var(--ink-2); line-height:1.85; margin:0; }
.sales-audience { padding-left:20px; font-size:14px; line-height:1.85; }
.sales-audience li { margin:12px 0; padding-left:4px; }
.sales-prerequisite { border-left:2px solid var(--line); padding-left:16px; margin-top:22px; }
.curriculum-heading { display:flex; align-items:center; justify-content:space-between; gap:12px; }
.curriculum-heading h2 { margin-bottom:0; }
.curriculum-heading > span { font-size:12px; color:var(--ink-3); white-space:nowrap; }
#curriculumTitle, #purchaseCard { scroll-margin-top:96px; }
.sales-section-intro { margin:12px 0 22px; }
.sales-curriculum { border:1px solid var(--line); border-radius:12px; overflow:hidden; }
.curriculum-module + .curriculum-module { border-top:1px solid var(--line); }
.curriculum-module summary { display:flex; align-items:center; gap:14px; padding:20px; list-style:none; cursor:pointer; }
.curriculum-module summary::-webkit-details-marker { display:none; }
.module-copy { flex:1; min-width:0; }
.module-copy strong { display:block; font-size:15px; font-weight:500; }
.module-copy > span { display:block; font-size:12px; color:var(--ink-2); line-height:1.7; margin-top:5px; }
.module-total { font-size:12px; color:var(--ink-3); white-space:nowrap; }
.module-chevron { color:var(--ink-3); }
.curriculum-module[open] .module-chevron { transform:rotate(180deg); }
.curriculum-module[open] summary { background:var(--paper-2); }
.curriculum-module ol { margin:0; padding:4px 20px 12px 54px; }
.curriculum-module li { padding:12px 0 12px 4px; font-size:14px; line-height:1.65; }
.curriculum-module li::marker { color:var(--ink-3); font-size:11px; font-family:var(--mono); }
.curriculum-module li + li { border-top:1px solid var(--line); }
.curriculum-module li small { display:block; color:var(--ink-3); font-size:12px; overflow-wrap:anywhere; }
.sales-faq details { border-bottom:1px solid var(--line); }
.sales-faq summary { padding:17px 0; cursor:pointer; font-size:14px; }
.sales-faq details p { font-size:14px; color:var(--ink-2); line-height:1.9; margin:0 0 20px; }
.sales-end { display:flex; align-items:center; justify-content:space-between; gap:16px; margin-top:36px; font-size:14px; }
.sales-end .btn { min-height:44px; }
.purchase-includes { list-style:none; padding:0; margin:28px 0; border-block:1px solid var(--line); }
.purchase-includes li { display:flex; justify-content:space-between; align-items:center; gap:16px; padding:16px 0; }
.purchase-includes li + li { border-top:1px solid var(--line); }
.purchase-includes a { color:var(--ink); text-decoration:none; }
.purchase-notice { padding:14px 18px; border-left:3px solid var(--accent); background:var(--paper-2); font-size:13px; line-height:1.8; margin-top:20px; }
.purchase-page button:focus-visible, .purchase-page summary:focus-visible, .purchase-page a:focus-visible, #curriculumTitle:focus-visible, #purchaseCard:focus-visible { outline:2px solid var(--accent-strong); outline-offset:4px; }
@media (hover:hover) and (pointer:fine) {
  .curriculum-module summary:hover, .sales-faq summary:hover { background:var(--paper-2); }
  .sales-directory-link:hover, .purchase-bundle-link:hover strong { text-decoration:underline; text-underline-offset:4px; }
}
@media(max-width:860px) {
  #curriculumTitle, #purchaseCard { scroll-margin-top:128px; }
  .purchase-page--detail { display:flex; flex-direction:column; gap:0; }
  .purchase-page--detail > * { width:100%; }
  .purchase-page--detail .purchase-card { position:static; margin-top:28px; }
  .purchase-back { margin-bottom:28px; }
  .purchase-hero h1 { max-width:20ch; }
  .sales-section { margin-top:36px; }
}
@media(max-width:520px) {
  .purchase-card { padding:22px; }
  .sales-headline { font-size:18px; }
  .sales-section h2 { font-size:21px; }
  .curriculum-module summary { gap:10px; padding:16px 12px; }
  .curriculum-module ol { padding-left:38px; padding-right:14px; }
  .sales-end { align-items:flex-start; flex-direction:column; }
  .sales-end .btn { width:100%; }
  .purchase-includes li { align-items:flex-start; }
}

html[lang="en"] .curriculum-module li small[lang="en"] { display:none; }