:root {
  --paper: #f4f0e7;
  --paper-light: #faf8f2;
  --card: #fffdf8;
  --ink: #171916;
  --body: #343a35;
  --muted: #70766f;
  --line: #d7d1c5;
  --line-soft: #e9e4da;
  --moss: #2f4b40;
  --moss-soft: #e1e8e2;
  --cinnabar: #a33a2b;
  --shadow: 0 16px 42px rgba(42, 38, 30, .08);
  --max: 1520px;
  --reading: 880px;
  --header-h: 72px;
  --serif: "Songti SC", SimSun, STKaiti, KaiTi, serif;
  --sans: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--body); background: var(--paper); font: 16px/1.75 var(--sans); letter-spacing: 0; }
body::before { content: ""; position: fixed; inset: 0; pointer-events: none; opacity: .2; z-index: -1; background-image: radial-gradient(rgba(52,58,53,.15) .6px, transparent .6px); background-size: 5px 5px; }
img, video { display: block; max-width: 100%; }
a { color: inherit; }
button, input { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button { cursor: pointer; }
[hidden] { display: none !important; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.skip-link { position: fixed; left: 16px; top: -60px; z-index: 1000; padding: 10px 14px; color: #fff; background: var(--ink); text-decoration: none; }
.skip-link:focus { top: 12px; }
:focus-visible { outline: 3px solid rgba(47,75,64,.32); outline-offset: 3px; }

.site-header { position: sticky; top: 0; z-index: 50; min-height: var(--header-h); color: var(--ink); background: rgba(250,248,242,.94); border-bottom: 1px solid rgba(23,25,22,.12); backdrop-filter: blur(12px); }
.header-inner { width: min(calc(100% - 48px), var(--max)); min-height: var(--header-h); margin: 0 auto; display: grid; grid-template-columns: 220px 1fr 42px; align-items: center; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 10px; width: max-content; text-decoration: none; }
.brand-mark { width: 36px; height: 36px; flex: 0 0 36px; overflow: hidden; border: 1px solid rgba(47,75,64,.35); border-radius: 50%; background: #78310f url("../../favicon.png") center / cover no-repeat; }
.brand-copy { display: grid; }
.brand-name { color: var(--ink); font: 700 27px/1 var(--serif); }
.brand-name span { color: var(--moss); }
.brand small { margin-top: 4px; color: var(--muted); font-size: 10px; }
.desktop-nav { display: flex; justify-content: center; align-items: center; gap: clamp(16px, 2vw, 30px); }
.desktop-nav a { position: relative; padding: 24px 0 20px; font-size: 14px; text-decoration: none; white-space: nowrap; }
.desktop-nav a::after { content: ""; position: absolute; left: 50%; bottom: 14px; width: 0; height: 1px; background: var(--ink); transition: width .2s ease, left .2s ease; }
.desktop-nav a:hover::after, .desktop-nav a.is-active::after { left: 0; width: 100%; }
.menu-button { display: none; width: 42px; height: 42px; padding: 10px; border: 1px solid var(--line); background: var(--paper-light); }
.menu-button span { display: block; height: 1px; margin: 5px 0; background: var(--ink); }
.mobile-nav { width: min(calc(100% - 32px), 520px); margin: 0 auto 16px; padding: 10px; border: 1px solid var(--line); background: var(--card); box-shadow: var(--shadow); }
.mobile-nav a { display: block; padding: 10px 12px; text-decoration: none; border-bottom: 1px solid var(--line-soft); }

.hero { min-height: min(570px, calc(100vh - var(--header-h))); display: grid; place-items: center; position: relative; overflow: hidden; background: var(--paper-light) url("../images/ink/hero-landscape.png") center bottom / cover no-repeat; border-bottom: 1px solid var(--line); }
.hero::after { content: ""; position: absolute; inset: 0; pointer-events: none; background: linear-gradient(90deg, rgba(250,248,242,.35), rgba(250,248,242,.04) 50%, rgba(250,248,242,.28)); }
.hero-content { position: relative; z-index: 1; width: min(calc(100% - 40px), 1760px); padding: 42px 0 58px; text-align: center; }
.seal-line, .eyebrow { margin: 0 0 14px; color: var(--moss); font-size: 12px; font-weight: 700; letter-spacing: .14em; }
.seal-line span { display: inline-block; margin-right: 10px; padding: 3px 8px; color: #fff; background: var(--cinnabar); letter-spacing: 0; }
.hero h1 { margin: 0; color: var(--ink); font: 800 clamp(44px, 5vw, 68px)/1.18 var(--serif); white-space: nowrap; }
.hero-copy { max-width: 1120px; margin: 16px auto 0; color: #454941; font-size: 17px; line-height: 1.75; white-space: nowrap; }
.value-tags { display: flex; justify-content: center; flex-wrap: wrap; gap: 9px 24px; margin: 18px 0; padding: 0; list-style: none; }
.value-tags li::before { content: "◇"; margin-right: 7px; color: var(--cinnabar); }
.hero-search { width: min(100%, 700px); margin: 0 auto; display: grid; grid-template-columns: 1fr auto; padding: 7px; border: 1px solid rgba(23,25,22,.18); background: rgba(255,253,248,.92); box-shadow: 0 12px 30px rgba(35,31,24,.1); }
.hero-search input { min-width: 0; padding: 12px 16px; border: 0; color: var(--ink); background: transparent; outline: 0; }

.button { min-height: 44px; display: inline-flex; align-items: center; justify-content: center; padding: 10px 22px; border: 1px solid var(--ink); color: var(--ink); background: transparent; text-decoration: none; transition: transform .18s ease, background .18s ease, color .18s ease; }
.button:hover { transform: translateY(-2px); }
.button-dark { color: #fff; background: var(--ink); }
.button-dark:hover { background: var(--moss); border-color: var(--moss); }
.button-paper { background: rgba(255,253,248,.9); border-color: var(--line); }
.button-cinnabar { color: #fff; background: var(--cinnabar); border-color: var(--cinnabar); }
.button-cinnabar:hover { background: #842f24; border-color: #842f24; }

.section { padding: 76px 0; }
.course-center { padding-top: 62px; }
.section-inner { width: min(calc(100% - 48px), var(--max)); margin: 0 auto; }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 30px; margin-bottom: 34px; }
.section-heading h2, .center-heading h2, .case-copy h2, .resource-layout h2, .value-band-inner h2 { margin: 0; color: var(--ink); font: 700 clamp(32px, 3.8vw, 52px)/1.24 var(--serif); }
.section-heading p, .center-heading p { margin: 10px 0 0; color: var(--muted); }
.text-link { color: var(--moss); font-weight: 700; text-decoration: none; white-space: nowrap; }
.search-summary { min-height: 24px; margin: -14px 0 16px; color: var(--muted); font-size: 14px; }
.course-toolbar { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin: -12px 0 22px; }
.course-toolbar .search-summary { min-height: 0; margin: 0; }
.course-toolbar-access { display: flex; min-width: 0; align-items: center; flex-wrap: wrap; gap: 10px; }
.series-filters { display: flex; flex-wrap: wrap; gap: 8px; }
.series-filter { min-height: 38px; padding: 7px 16px; border: 1px solid var(--line); color: var(--body); background: var(--card); transition: color .18s ease, border-color .18s ease, background .18s ease; }
.series-filter:hover { border-color: var(--moss); color: var(--moss); }
.series-filter.is-active { color: #fff; border-color: var(--moss); background: var(--moss); }
.course-access-summary { min-height: 38px; margin: 0; padding: 8px 14px; display: inline-flex; align-items: center; border: 1px solid var(--line); color: var(--muted); background: rgba(255,255,255,.44); font-size: 14px; line-height: 1.4; }
.course-access-summary[data-state="unlocked"] { border-color: rgba(35,80,64,.42); color: var(--moss); background: var(--moss-soft); font-weight: 700; }
.course-access-summary[data-state="locked"] { color: var(--body); }
.course-access-summary[data-state="warning"] { border-color: rgba(161,56,39,.28); color: var(--cinnabar); }

.wechat-return-page { min-height: 100vh; display: grid; place-items: center; padding: 24px; background: var(--paper); }
.wechat-return-card { width: min(100%, 460px); padding: clamp(34px, 8vw, 58px); text-align: center; border: 1px solid var(--line); background: var(--card); box-shadow: 0 18px 50px rgba(43,39,32,.08); }
.wechat-return-mark { width: 62px; height: 62px; display: grid; place-items: center; margin: 0 auto 22px; border-radius: 50%; color: #fff; background: var(--moss); font: 700 30px/1 var(--sans); }
.wechat-return-card h1 { margin: 0; color: var(--ink); font: 700 clamp(30px, 8vw, 42px)/1.25 var(--serif); }
.wechat-return-card p { margin: 16px 0 0; color: var(--muted); line-height: 1.8; }
.wechat-return-card .button { width: 100%; margin-top: 28px; }

.course-grid { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 16px; }
.course-card { min-width: 0; min-height: 0; display: grid; grid-template-rows: auto 1fr; border: 1px solid var(--line); background: var(--card); box-shadow: 0 7px 20px rgba(43,39,32,.045); transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease; }
.course-card:hover { border-color: #bbb5aa; box-shadow: 0 12px 28px rgba(43,39,32,.075); transform: translateY(-3px); }
.course-card-media { position: relative; aspect-ratio: 4 / 3; overflow: hidden; background: var(--moss-soft); }
.course-card-media img { width: 100%; height: 100%; object-fit: contain; }
.course-card-media.is-missing::after { content: "课程封面"; position: absolute; inset: 0; display: grid; place-items: center; color: var(--moss); background: linear-gradient(135deg, var(--moss-soft), var(--paper-light)); font: 700 15px/1 var(--serif); }
.course-code { position: absolute; left: 12px; top: 12px; z-index: 1; padding: 4px 8px; color: #fff; background: rgba(23,25,22,.86); font-size: 11px; font-variant-numeric: tabular-nums; }
.course-status { position: absolute; right: 18px; top: 18px; padding: 5px 9px; color: var(--moss); border: 1px solid rgba(47,75,64,.3); background: rgba(250,248,242,.92); font-size: 12px; }
.course-card-body { min-height: 148px; display: flex; flex-direction: column; padding: 15px 16px 16px; }
.course-card h3 { min-height: 6.15em; margin: 0; overflow: hidden; color: var(--ink); }
.course-card h3 a { display: grid; gap: 7px; color: inherit; text-decoration: none; }
.course-card-problem { overflow: hidden; font: 700 17px/1.45 var(--serif); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }
.course-card-solution { overflow: hidden; padding-top: 7px; color: var(--moss); border-top: 1px solid var(--line-soft); font: 600 13px/1.5 var(--sans); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }
.course-description { display: none; }
.course-meta { margin: 10px 0 12px; padding-top: 9px; overflow: hidden; color: var(--muted); border-top: 1px solid var(--line-soft); font-size: 12px; line-height: 1.4; text-overflow: ellipsis; white-space: nowrap; font-variant-numeric: tabular-nums; }
.course-warning { margin: -8px 0 16px; color: var(--cinnabar); font-size: 13px; }
.course-card-action { width: 100%; min-height: 38px; margin-top: auto; padding: 7px 12px; font-size: 13px; }
.empty-state { grid-column: 1 / -1; padding: 50px 20px; border: 1px solid var(--line); text-align: center; background: var(--card); }

.ink-value-band { position: relative; padding: 76px 0; color: #f8f4ea; background: var(--ink) url("../images/ink/trust-brush.png") center / cover no-repeat; }
.value-band-inner { width: min(calc(100% - 48px), var(--max)); margin: 0 auto; display: grid; grid-template-columns: .8fr 1.7fr; align-items: center; gap: 70px; }
.value-band-inner h2 { color: #fff; }
.value-band-inner .eyebrow { color: #c6d6cf; }
.course-values { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px 30px; margin: 0; padding: 0; list-style: none; }
.course-values li { padding: 14px 0; border-bottom: 1px solid rgba(255,255,255,.22); }
.course-values li::before { content: "○"; margin-right: 9px; color: #d7a297; }

.center-heading { max-width: 720px; margin: 0 auto 42px; text-align: center; }
.learning-steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; margin: 0; padding: 0; list-style: none; }
.learning-steps li { position: relative; display: grid; grid-template-columns: 88px 1fr; align-items: center; gap: 20px; min-height: 180px; padding: 26px; border-top: 1px solid var(--ink); border-bottom: 1px solid var(--line); }
.ink-number { display: grid; place-items: center; width: 76px; height: 76px; color: #fff; border-radius: 50%; background: var(--ink); font: italic 700 38px/1 var(--serif); }
.learning-steps h3 { margin: 0 0 7px; color: var(--ink); font: 700 24px/1.3 var(--serif); }
.learning-steps p { margin: 0; color: var(--muted); }

.resource-section { padding-block: 70px; }
.resource-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: end; }
.resource-list { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.resource-list span { padding: 14px 16px; border-bottom: 1px solid var(--line); }
.resource-list span::before { content: "✓"; margin-right: 9px; color: var(--cinnabar); }

.site-footer { padding: 52px 0 26px; color: #d6d2c8; background: #171916; }
.footer-inner { width: min(calc(100% - 48px), var(--max)); margin: 0 auto; display: grid; grid-template-columns: 1fr 1.6fr; gap: 34px 80px; }
.footer-brand .brand-name { color: #fff; }
.footer-brand-block p { max-width: 420px; color: #aaa99f; }
.site-footer nav { display: flex; flex-wrap: wrap; align-content: start; gap: 14px 28px; }
.site-footer nav a { text-decoration: none; }
.site-footer nav a:hover { color: #fff; }
.copyright { grid-column: 1 / -1; margin: 0; padding-top: 24px; border-top: 1px solid rgba(255,255,255,.13); color: #888980; font-size: 13px; }

/* Course directory */
.directory-hero { padding: 50px 0 34px; border-bottom: 1px solid var(--line); background: var(--paper-light) url("../images/ink/hero-landscape.png") center 72% / cover no-repeat; }
.directory-hero-inner { width: min(calc(100% - 48px), var(--max)); margin: auto; }
.directory-hero h1 { max-width: 980px; margin: 0; color: var(--ink); font: 800 clamp(38px, 4vw, 56px)/1.18 var(--serif); text-wrap: balance; }
.directory-hero p { max-width: 720px; margin: 12px 0 0; font-size: 16px; }
.directory-search { width: min(100%, 650px); margin-top: 20px; display: grid; grid-template-columns: 1fr auto; padding: 6px; border: 1px solid var(--line); background: rgba(255,253,248,.92); }
.directory-search input { min-width: 0; padding: 12px; border: 0; background: transparent; outline: 0; }

/* Information pages */
.info-main { width: min(calc(100% - 40px), 900px); margin: 72px auto 100px; padding: clamp(28px, 5vw, 68px); border: 1px solid var(--line); background: var(--card); box-shadow: var(--shadow); }
.info-main h1 { margin-top: 0; color: var(--ink); font: 700 clamp(38px, 5vw, 58px)/1.2 var(--serif); }
.info-main h2 { margin-top: 44px; color: var(--moss); font: 700 28px/1.35 var(--serif); }

/* Trust, legal and help pages */
.trust-hero { position: relative; min-height: 360px; display: grid; align-items: end; overflow: hidden; border-bottom: 1px solid var(--line); background: var(--paper-light) url("../images/ink/hero-landscape.png") center 56% / cover no-repeat; }
.trust-hero::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(250,248,242,.96) 4%, rgba(250,248,242,.76) 48%, rgba(250,248,242,.2)); }
.trust-hero-inner { position: relative; z-index: 1; width: min(calc(100% - 48px), 1280px); margin: 0 auto; padding: 86px 0 60px; }
.trust-hero h1 { margin: 0; color: var(--ink); font: 800 clamp(50px, 7vw, 86px)/1.05 var(--serif); letter-spacing: -.03em; }
.trust-hero p:last-child { max-width: 700px; margin: 18px 0 0; color: #4d514b; font-size: 17px; }
.trust-layout { width: min(calc(100% - 48px), 1280px); margin: 0 auto; display: grid; grid-template-columns: 230px minmax(0, 1fr); gap: 54px; padding: 74px 0 110px; }
.trust-toc { position: sticky; top: 104px; align-self: start; padding: 4px 22px 4px 0; border-right: 1px solid var(--line); }
.trust-toc nav { display: grid; }
.trust-toc a { padding: 9px 0; color: var(--muted); border-bottom: 1px solid var(--line-soft); text-decoration: none; font-size: 13px; }
.trust-toc a:hover { color: var(--moss); }
.trust-document { min-width: 0; border-top: 4px solid var(--moss); }
.document-intro { display: grid; grid-template-columns: 110px 1fr; gap: 28px; padding: 34px 0 46px; border-bottom: 1px solid var(--line); }
.document-index { color: var(--cinnabar); font: 800 15px/1.4 var(--sans); letter-spacing: .12em; }
.document-intro h2 { margin: 0 0 14px; color: var(--ink); font: 700 clamp(34px, 4vw, 50px)/1.25 var(--serif); }
.document-intro p:last-child { max-width: 760px; margin: 0; color: var(--muted); }
.document-section { display: grid; grid-template-columns: 110px 1fr; gap: 28px; padding: 48px 0; border-bottom: 1px solid var(--line); scroll-margin-top: 100px; }
.document-section-accent { margin-inline: -28px; padding-inline: 28px; border-left: 4px solid var(--cinnabar); background: rgba(163,58,43,.045); }
.section-number { color: #aaa69d; font: 800 13px/1.4 var(--sans); letter-spacing: .14em; }
.document-section h2 { margin: 0 0 18px; color: var(--ink); font: 700 clamp(28px, 3vw, 38px)/1.3 var(--serif); }
.document-section p { margin: 0 0 16px; }
.document-section p:last-child { margin-bottom: 0; }
.document-section li { margin-bottom: 8px; }
.document-section a { color: var(--moss); font-weight: 700; text-underline-offset: 3px; }
.price-ledger { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-bottom: 24px; }
.price-ledger div { display: grid; gap: 5px; padding: 22px; border: 1px solid var(--line); background: var(--card); }
.price-ledger span, .price-ledger small { color: var(--muted); }
.price-ledger strong { color: var(--cinnabar); font: 800 32px/1.2 var(--serif); }
.policy-table { border-top: 1px solid var(--ink); }
.policy-table > div { display: grid; grid-template-columns: minmax(130px, .4fr) minmax(0, 1fr); gap: 22px; padding: 16px 0; border-bottom: 1px solid var(--line); }
.policy-table strong { color: var(--moss); }
.crawler-summary { margin-top: 46px; padding: 24px 28px; color: #e7e4dc; border-left: 4px solid var(--cinnabar); background: var(--ink); }
.crawler-summary strong { color: #fff; font: 700 19px/1.4 var(--serif); }
.crawler-summary p { margin: 10px 0 0; color: #bebdb6; }

/* About */
.about-hero { position: relative; padding: 110px 0 96px; overflow: hidden; color: #f7f4eb; background: var(--ink) url("../images/ink/trust-brush.png") center / cover no-repeat; }
.about-hero::after { content: "源"; position: absolute; right: 6vw; bottom: -90px; color: rgba(255,255,255,.035); font: 800 360px/1 var(--serif); pointer-events: none; }
.about-hero-grid { position: relative; z-index: 1; width: min(calc(100% - 48px), 1280px); margin: auto; display: grid; grid-template-columns: 1.35fr .65fr; align-items: end; gap: 80px; }
.about-hero .eyebrow { color: #bdd0c7; }
.about-hero h1 { margin: 0; color: #fff; font: 800 clamp(50px, 6vw, 82px)/1.15 var(--serif); letter-spacing: -.035em; }
.about-hero-grid > div > p:last-child { max-width: 720px; margin: 24px 0 0; color: #c8c8c1; font-size: 18px; }
.about-hero blockquote { margin: 0; padding: 28px 0 4px 28px; border-left: 1px solid rgba(255,255,255,.34); }
.about-hero blockquote span { color: #bdd0c7; font-size: 12px; font-weight: 800; letter-spacing: .14em; }
.about-hero blockquote p { margin: 14px 0 0; color: #fff; font: 700 24px/1.65 var(--serif); }
.about-stats { width: min(calc(100% - 48px), 1280px); margin: 0 auto; display: grid; grid-template-columns: repeat(4, 1fr); border-inline: 1px solid var(--line); }
.about-stats div { display: grid; gap: 4px; padding: 34px 28px; border-right: 1px solid var(--line); background: var(--card); }
.about-stats div:last-child { border-right: 0; }
.about-stats strong { color: var(--cinnabar); font: 800 34px/1.2 var(--serif); }
.about-stats span { color: var(--muted); font-size: 13px; }
.about-section, .about-values, .about-contact { width: min(calc(100% - 48px), 1100px); margin: 0 auto; padding: 90px 0; border-bottom: 1px solid var(--line); }
.about-section-heading { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 34px; margin-bottom: 38px; }
.about-section-heading h2 { margin: 0; color: var(--ink); font: 700 clamp(34px, 4vw, 50px)/1.25 var(--serif); }
.about-prose { margin-left: 254px; display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.about-prose p { margin: 0; font-size: 17px; }
.about-curriculum .policy-table, .about-section > .policy-table { margin-left: 254px; }
.about-values ol { margin: 0 0 0 254px; padding: 0; list-style: none; display: grid; grid-template-columns: 1fr 1fr; gap: 1px; background: var(--line); }
.about-values li { padding: 28px; background: var(--card); }
.about-values li span { color: var(--cinnabar); font-size: 12px; font-weight: 800; letter-spacing: .12em; }
.about-values h3 { margin: 14px 0 8px; color: var(--ink); font: 700 24px/1.35 var(--serif); }
.about-values p { margin: 0; color: var(--muted); }
.about-contact { display: flex; align-items: end; justify-content: space-between; gap: 50px; border-bottom: 0; }
.about-contact h2 { margin: 0; color: var(--ink); font: 700 clamp(34px, 4vw, 50px)/1.25 var(--serif); }
.about-contact p:last-child { max-width: 660px; margin-bottom: 0; }

/* Help */
.help-hero { padding: 96px 0 76px; border-bottom: 1px solid var(--line); background: var(--paper-light) url("../images/ink/hero-landscape.png") center 63% / cover no-repeat; }
.help-hero-inner { width: min(calc(100% - 48px), 1280px); margin: auto; }
.help-hero h1 { max-width: 800px; margin: 0; color: var(--ink); font: 800 clamp(54px, 7vw, 88px)/1.08 var(--serif); letter-spacing: -.035em; }
.help-hero-inner > p:not(.eyebrow) { max-width: 690px; margin: 20px 0 0; font-size: 17px; }
.help-jump { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px; }
.help-jump a { padding: 10px 18px; color: var(--moss); border: 1px solid rgba(47,75,64,.35); background: rgba(255,253,248,.78); text-decoration: none; }
.help-jump a:hover { color: #fff; background: var(--moss); }
.help-shell { width: min(calc(100% - 48px), 1280px); margin: auto; display: grid; grid-template-columns: 280px minmax(0, 1fr); gap: 56px; padding: 72px 0 110px; }
.help-aside { position: sticky; top: 104px; align-self: start; padding: 26px; border: 1px solid var(--line); background: var(--card); }
.help-aside dl { margin: 0; }
.help-aside dl div { display: flex; align-items: baseline; justify-content: space-between; gap: 18px; padding: 12px 0; border-bottom: 1px solid var(--line-soft); }
.help-aside dt { color: var(--muted); }
.help-aside dd { margin: 0; color: var(--cinnabar); font: 800 20px/1.2 var(--serif); }
.help-aside > p:last-child { margin: 22px 0 0; color: var(--muted); font-size: 13px; }
.faq-groups { min-width: 0; }
.faq-group { margin-bottom: 70px; scroll-margin-top: 100px; }
.faq-group > header { display: grid; grid-template-columns: 74px 1fr; gap: 20px; padding-bottom: 24px; border-bottom: 3px solid var(--moss); }
.faq-group > header > span { color: var(--cinnabar); font: 800 14px/1.4 var(--sans); letter-spacing: .14em; }
.faq-group h2 { margin: 0; color: var(--ink); font: 700 clamp(34px, 4vw, 48px)/1.2 var(--serif); }
.faq-item { display: grid; grid-template-columns: minmax(240px, .85fr) minmax(0, 1.15fr); gap: 34px; padding: 28px 0; border-bottom: 1px solid var(--line); }
.faq-item h3 { margin: 0; color: var(--ink); font: 700 22px/1.5 var(--serif); }
.faq-item h3::before { content: "Q"; display: inline-grid; place-items: center; width: 26px; height: 26px; margin-right: 10px; color: #fff; border-radius: 50%; background: var(--moss); font: 800 11px/1 var(--sans); vertical-align: 3px; }
.faq-item p { margin: 0; color: #555b55; }
.faq-item strong { color: var(--cinnabar); }

/* Course article */
.article-header { position: sticky; top: 0; z-index: 50; min-height: 68px; border-bottom: 1px solid var(--line); background: rgba(250,248,242,.95); backdrop-filter: blur(12px); }
.article-header-inner { width: min(calc(100% - 48px), 1280px); min-height: 68px; margin: auto; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.article-nav { display: flex; gap: 24px; }
.article-nav a { color: var(--moss); text-decoration: none; }
.reading-progress { position: fixed; left: 0; top: 68px; z-index: 80; width: 0; height: 3px; background: var(--cinnabar); }
.article-hero { position: relative; min-height: 440px; display: grid; place-items: center; overflow: hidden; color: #fff; background: var(--ink); }
.article-hero > img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; opacity: .38; filter: grayscale(1) contrast(1.12); }
.article-hero::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(23,25,22,.82), rgba(23,25,22,.46)); }
.article-hero-content { position: relative; z-index: 1; width: min(calc(100% - 48px), 980px); padding: 70px 0; }
.article-kicker { color: #d4ddd7; font-weight: 700; }
.article-hero h1 { max-width: 980px; margin: 12px 0 26px; }
.course-hero-heading { display: grid; gap: 18px; }
.course-hero-problem { max-width: 940px; color: #fff; font: 800 clamp(40px, 5vw, 68px)/1.16 var(--serif); text-wrap: balance; }
.course-hero-solution { width: fit-content; max-width: 860px; padding-top: 15px; color: #d7e0da; border-top: 1px solid rgba(255,255,255,.34); font: 600 clamp(20px, 2.1vw, 30px)/1.45 var(--sans); letter-spacing: .02em; text-wrap: balance; }
.article-meta { display: flex; flex-wrap: wrap; gap: 10px 22px; color: #e2e1dc; }
.article-shell { width: min(calc(100% - 48px), 1280px); margin: 0 auto; display: grid; grid-template-columns: 220px minmax(0, var(--reading)); justify-content: center; gap: 60px; padding: 70px 0 120px; }
.article-toc { position: sticky; top: 105px; align-self: start; max-height: calc(100vh - 135px); overflow: auto; padding-right: 18px; border-right: 1px solid var(--line); }
.article-toc strong { display: block; margin-bottom: 14px; color: var(--ink); }
.article-toc nav { display: grid; gap: 0; }
.article-toc a { display: block; padding: 8px 10px; color: var(--muted); border-left: 2px solid transparent; text-decoration: none; font-size: 14px; line-height: 1.75; }
.article-toc a.toc-method { margin-top: 7px; padding-top: 10px; padding-bottom: 11px; border-top: 1px solid var(--line-soft); }
.article-toc a:hover, .article-toc a.is-current { color: var(--moss); border-left-color: var(--moss); background: var(--moss-soft); }
.article-content { min-width: 0; padding: clamp(28px, 5vw, 64px); border: 1px solid var(--line); background: var(--card); box-shadow: var(--shadow); }
.article-content h2 { margin: 72px 0 24px; color: var(--ink); font: 700 clamp(30px, 3vw, 42px)/1.35 var(--serif); }
.article-content h2:first-child { margin-top: 0; }
.article-content h3 { margin: 42px 0 18px; color: var(--moss); font: 700 25px/1.4 var(--serif); }
.article-content h4 { margin: 26px 0 12px; color: var(--ink); font-size: 18px; }
.article-content p, .article-content li { line-height: 2; }
.article-content code,
.article-content pre,
.protected-article-content code,
.protected-article-content pre {
  font-family: var(--sans);
  font-size: inherit;
  font-weight: inherit;
  font-style: inherit;
  letter-spacing: inherit;
}
.article-content pre,
.protected-article-content pre {
  line-height: 2;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.article-content pre code,
.protected-article-content pre code { font: inherit; }
.article-content blockquote { margin: 24px 0; padding: 16px 20px; border-left: 3px solid var(--moss); background: #f3f5f1; }
.article-content blockquote p { margin: 0; }
.article-content hr { margin: 62px auto; width: 45%; border: 0; border-top: 1px solid var(--line); }
.prompt-showcase { margin: 34px 0 0; padding: 22px; border: 1px solid var(--line); background: #f8f7f2; }
.prompt-showcase-title { margin: 0 0 18px !important; color: var(--ink) !important; font-size: 20px !important; }
.prompt-grid { display: grid; grid-template-columns: 1fr 1fr; align-items: stretch; gap: 16px; }
.prompt-card { min-width: 0; display: flex; flex-direction: column; padding: 18px; border-top: 3px solid #7c827d; background: var(--card); }
.prompt-card-director { border-top-color: var(--moss); }
.prompt-card-header { display: flex; align-items: start; justify-content: space-between; gap: 12px; }
.prompt-card-header h4 { margin: 0; }
.prompt-card-actions { flex: 0 0 auto; display: flex; align-items: center; gap: 7px; }
.prompt-text { margin: 14px 0 0; color: #52574f; }
.prompt-text-collapsible.is-collapsed { display: -webkit-box; overflow: hidden; -webkit-box-orient: vertical; -webkit-line-clamp: 3; }
.prompt-toggle { flex: 0 0 auto; padding: 7px 11px; border: 1px solid var(--moss); color: var(--moss); background: transparent; transition: color .2s ease, background .2s ease, transform .2s ease; }
.prompt-toggle::after { content: "⌄"; display: inline-block; margin-left: 5px; transition: transform .2s ease; }
.prompt-toggle[aria-expanded="true"]::after { transform: rotate(180deg); }
.prompt-toggle:hover { color: #fff; background: var(--moss); }
.prompt-toggle:active { transform: translateY(1px); }
.copy-button { flex: 0 0 auto; padding: 7px 11px; border: 1px solid var(--line); color: var(--moss); background: var(--paper-light); }
.copy-button:hover { color: #fff; border-color: var(--moss); background: var(--moss); }
.media-compare { margin: 0 0 42px; padding: 22px; border: 1px solid var(--line); border-top: 0; background: var(--card); }
.compare-heading { display: flex; justify-content: space-between; gap: 20px; margin-bottom: 18px; color: var(--ink); font-weight: 700; }
.compare-heading span { color: var(--muted); font-size: 13px; font-weight: 400; }
.compare-grid { position: relative; display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.compare-grid-single { grid-template-columns: minmax(0, 1fr); }
.compare-grid-single::after { display: none; }
.compare-grid::after { content: "VS"; position: absolute; left: 50%; top: 50%; z-index: 2; display: grid; place-items: center; width: 42px; height: 42px; color: var(--moss); border: 1px solid var(--moss); border-radius: 50%; background: var(--paper-light); transform: translate(-50%,-25%); font: 700 15px/1 var(--serif); }
.compare-item { min-width: 0; margin: 0; }
.compare-item figcaption { margin-bottom: 10px; color: var(--ink); font-weight: 700; text-align: center; }
.media-frame { display: grid; place-items: start stretch; overflow: visible; background: #eef1ed; }
.media-frame img, .media-frame video { display: block; width: 100%; max-width: 100%; height: auto; object-fit: contain; }
.media-missing { padding: 20px; color: var(--muted); text-align: center; }
.lesson-pagination { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 72px; padding-top: 24px; border-top: 1px solid var(--line); }
.lesson-link { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 16px 18px; border: 1px solid var(--line); background: var(--paper-light); text-decoration: none; }
.lesson-link:hover { border-color: var(--moss); }
.lesson-link span { color: var(--muted); font-size: 13px; }
.lesson-link strong { color: var(--ink); }
.lesson-link.is-disabled { opacity: .45; }
.copy-toast { position: fixed; right: 24px; bottom: 24px; z-index: 100; padding: 11px 16px; color: #fff; background: var(--moss); opacity: 0; transform: translateY(12px); pointer-events: none; transition: .2s ease; }
.copy-toast.is-visible { opacity: 1; transform: translateY(0); }

/* Account and protected course access */
.header-inner { grid-template-columns: 220px minmax(0, 1fr) auto 42px; }
.auth-nav { display: flex; align-items: center; justify-content: flex-end; gap: 8px; white-space: nowrap; }
.account-link { min-height: 36px; display: inline-flex; align-items: center; padding: 7px 12px; border: 1px solid var(--line); color: var(--ink); text-decoration: none; font-size: 13px; }
.account-link-primary { color: #fff; border-color: var(--moss); background: var(--moss); }
.account-link:hover { border-color: var(--moss); }
.account-page { min-height: 100vh; background: var(--paper-light); }
.account-shell { min-height: calc(100vh - var(--header-h)); display: grid; place-items: center; padding: 56px 20px 80px; }
.auth-card { width: min(100%, 520px); padding: clamp(28px, 5vw, 52px); border: 1px solid var(--line); background: rgba(255,253,248,.97); box-shadow: var(--shadow); }
.auth-card h1, .account-dashboard h1 { margin: 6px 0 12px; color: var(--ink); font: 700 clamp(36px, 5vw, 52px)/1.25 var(--serif); }
.auth-card > p:not(.eyebrow):not(.form-status) { margin-bottom: 28px; color: var(--muted); }
.account-form { display: grid; gap: 18px; }
.account-form label { display: grid; gap: 8px; color: var(--ink); font-weight: 700; }
.account-form input { width: 100%; min-height: 46px; padding: 10px 12px; border: 1px solid var(--line); color: var(--ink); background: #fff; outline: 0; }
.account-form input:focus { border-color: var(--moss); box-shadow: 0 0 0 3px rgba(57,78,66,.09); }
.account-form input:disabled { color: var(--muted); background: #f1f0eb; }
.account-form .button { width: 100%; margin-top: 4px; }
.captcha-field { min-height: 70px; display: grid; place-items: center; overflow: hidden; color: var(--muted); font-size: 14px; }
.captcha-field > div { max-width: 100%; }
.verification-resend { width: 100%; margin-top: 14px; border-color: var(--moss); color: var(--moss); }
.verification-resend:disabled, .account-form .button:disabled { cursor: not-allowed; opacity: .58; transform: none; }
.auth-card-links { display: flex; justify-content: space-between; gap: 20px; margin-top: 22px; }
.auth-card-links a { color: var(--moss); }
.form-status { margin: 0 0 18px; padding: 12px 14px; border-left: 3px solid var(--moss); background: #eef2ee; }
.form-status[data-kind="success"] { color: #315b43; border-color: #315b43; background: #edf5ef; }
.form-status[data-kind="warning"] { color: #76521e; border-color: #a37635; background: #fbf4e7; }
.form-status[data-kind="error"] { color: #7e3028; border-color: #9d3b31; background: #f9ece9; }
.pending-order-status { display: grid; gap: 0; padding: 0; overflow: hidden; }
.pending-order-summary { display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 12px 14px; }
.pending-order-message { margin: 0; }
.pending-order-actions { display: flex; flex: 0 0 auto; gap: 8px; }
.pending-order-action,
.pending-order-copy,
.pending-order-query {
  min-height: 34px;
  padding: 7px 12px;
  border: 1px solid rgba(57,78,66,.34);
  color: var(--moss);
  background: rgba(255,255,255,.7);
  font: 700 13px/1.2 var(--sans);
  cursor: pointer;
}
.pending-order-action:hover,
.pending-order-copy:hover,
.pending-order-query:hover { border-color: var(--moss); background: #fff; }
.pending-order-action-primary { color: #fff; border-color: var(--moss); background: var(--moss); text-decoration: none; }
.pending-order-action-primary:hover { color: #fff; background: #213f33; }
.pending-order-details { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; padding: 14px; border-top: 1px solid rgba(57,78,66,.16); background: rgba(255,255,255,.48); }
.pending-order-details[hidden] { display: none; }
.pending-order-row { display: grid; align-content: start; gap: 4px; min-width: 0; }
.pending-order-label { color: var(--muted); font-size: 12px; }
.pending-order-value { overflow-wrap: anywhere; color: var(--ink); font-weight: 700; }
.pending-order-copy { justify-self: start; min-height: 28px; padding: 4px 9px; margin-top: 3px; font-size: 12px; }
.pending-order-query { align-self: end; justify-self: end; }
.pending-order-query:disabled { cursor: wait; opacity: .65; }
.account-dashboard { width: min(calc(100% - 40px), 1040px); margin: 0 auto; padding: 62px 0 100px; }
.account-dashboard > header { margin-bottom: 28px; }
.account-content { min-height: 260px; padding: clamp(24px, 4vw, 42px); border: 1px solid var(--line); background: var(--card); box-shadow: var(--shadow); }
.account-role { color: var(--muted); }
.account-empty { text-align: center; }
.account-empty h2 { color: var(--ink); font: 700 32px/1.3 var(--serif); }
.account-profile-stack { display: grid; gap: clamp(44px, 7vw, 72px); }
.order-history { padding-top: clamp(36px, 5vw, 52px); border-top: 1px solid var(--line); }
.order-history-heading { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 24px; }
.order-history-heading h2 { margin: 4px 0 0; color: var(--ink); font: 700 clamp(30px, 4vw, 40px)/1.25 var(--serif); }
.order-history-heading > p { max-width: 310px; margin: 0; color: var(--muted); text-align: right; }
.order-history-list { display: grid; gap: 16px; }
.order-history-card { padding: 22px; border: 1px solid var(--line); background: var(--paper-light); }
.order-history-card-head { display: flex; align-items: start; justify-content: space-between; gap: 20px; padding-bottom: 18px; border-bottom: 1px solid var(--line-soft); }
.order-history-product { margin: 0; color: var(--ink); font: 700 22px/1.4 var(--serif); }
.order-history-created { margin: 6px 0 0; color: var(--muted); font-size: 13px; }
.order-history-status { flex: 0 0 auto; padding: 6px 10px; color: var(--moss); border: 1px solid rgba(57,78,66,.28); background: #edf5f0; font-size: 13px; font-weight: 800; }
.order-history-status[data-order-status="paid"] { color: #fff; border-color: var(--moss); background: var(--moss); }
.order-history-status[data-order-status="failed"],
.order-history-status[data-order-status="cancelled"],
.order-history-status[data-order-status="canceled"],
.order-history-status[data-order-status="closed"] { color: var(--muted); border-color: var(--line); background: #f1f0eb; }
.order-history-status[data-order-status="refunded"] { color: #76521e; border-color: #d7b77f; background: #fbf4e7; }
.order-history-facts { display: grid; grid-template-columns: minmax(260px, 1.8fr) repeat(3, minmax(110px, .7fr)); gap: 18px; margin: 18px 0 0; }
.order-history-facts > div { min-width: 0; }
.order-history-facts dt { margin-bottom: 5px; color: var(--muted); font-size: 12px; }
.order-history-facts dd { margin: 0; color: var(--ink); font-weight: 700; font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }
.order-history-number { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 5px 10px; align-items: end; }
.order-history-number dt { grid-column: 1 / -1; }
.order-history-number code { font: 700 14px/1.5 var(--sans); letter-spacing: .02em; }
.order-history-number button { min-height: 44px; padding: 8px 12px; border: 1px solid var(--moss); color: var(--moss); background: transparent; font: 700 13px/1.2 var(--sans); cursor: pointer; }
.order-history-number button:hover { color: #fff; background: var(--moss); }
.order-history-number button:focus-visible { outline: 2px solid var(--cinnabar); outline-offset: 2px; }
.order-history-empty { padding: 34px 20px; border: 1px dashed var(--line); text-align: center; }
.order-history-empty h3 { margin: 0 0 8px; color: var(--ink); font: 700 25px/1.4 var(--serif); }
.order-history-empty p { margin: 0 0 18px; color: var(--muted); }
.order-history-empty[data-order-history-error] { color: #7e3028; border-color: rgba(157,59,49,.4); background: #f9ece9; }
.purchase-card { scroll-margin-top: calc(var(--header-h) + 22px); display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(320px, .95fr); gap: clamp(28px, 5vw, 64px); margin-bottom: 42px; padding-bottom: 42px; border-bottom: 1px solid var(--line); }
.purchase-copy h2, .owned-courses-heading h2 { margin: 0; color: var(--ink); font: 700 clamp(30px, 4vw, 44px)/1.25 var(--serif); }
.purchase-copy > p:not(.eyebrow) { max-width: 560px; margin: 16px 0 0; color: var(--muted); }
.purchase-benefits { display: grid; gap: 10px; margin: 24px 0 0; padding: 0; list-style: none; }
.purchase-benefits li { padding-bottom: 10px; border-bottom: 1px solid var(--line-soft); }
.purchase-benefits li::before { content: "◇"; margin-right: 9px; color: var(--cinnabar); }
.purchase-form { align-self: start; display: grid; gap: 18px; padding: 24px; border: 1px solid var(--line); background: var(--paper-light); }
.purchase-price { display: grid; padding-bottom: 16px; border-bottom: 1px solid var(--line); }
.purchase-price span, .purchase-price small { color: var(--muted); }
.purchase-price strong { color: var(--cinnabar); font: 800 38px/1.3 var(--serif); font-variant-numeric: tabular-nums; }
.purchase-test-note { margin: -4px 0 0; padding: 10px 12px; color: #76521e; border-left: 3px solid #a37635; background: #fbf4e7; font-size: 13px; }
.purchase-form fieldset { margin: 0; padding: 0; border: 0; }
.purchase-form legend { margin-bottom: 8px; color: var(--ink); font-weight: 700; }
.payment-channel-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.payment-channel-grid label { min-height: 48px; display: flex; align-items: center; gap: 9px; padding: 10px 12px; border: 1px solid var(--line); background: var(--card); cursor: pointer; }
.payment-channel-grid label:has(input:checked) { color: var(--moss); border-color: var(--moss); box-shadow: inset 0 0 0 1px var(--moss); }
.payment-channel-grid input, .purchase-consent input { width: 18px; height: 18px; flex: 0 0 18px; accent-color: var(--moss); }
.purchase-consent { display: flex; align-items: flex-start; gap: 10px; color: var(--muted); font-size: 13px; cursor: pointer; }
.purchase-consent input { margin-top: 3px; }
.purchase-consent a { color: var(--moss); font-weight: 700; }
.purchase-form .button { width: 100%; }
.purchase-form .button:disabled { cursor: not-allowed; opacity: .56; transform: none; }
.purchase-hint, .purchase-message { margin: 0; color: var(--muted); font-size: 13px; }
.purchase-message { min-height: 23px; color: var(--moss); }
.purchase-message[data-kind="error"] { color: #7e3028; }
.owned-courses-section { margin-top: 8px; }
.owned-courses-heading { margin-bottom: 22px; }
.owned-course-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.owned-course-card { display: grid; gap: 12px; padding: 22px; border: 1px solid var(--line); background: var(--paper-light); }
.owned-course-card p { margin: 0; color: var(--cinnabar); font-weight: 800; }
.owned-course-card h2 { margin: 0; color: var(--ink); font: 700 25px/1.4 var(--serif); }
.owned-course-card span { color: var(--muted); }
.course-access-shell { width: min(calc(100% - 48px), 1280px); margin: 0 auto; display: grid; grid-template-columns: 220px minmax(0, var(--reading)); justify-content: center; gap: 60px; padding: 56px 0 110px; }
.course-access-main { min-width: 0; }
.course-preview-card, .course-gate, .protected-article-content { padding: clamp(28px, 5vw, 58px); border: 1px solid var(--line); background: var(--card); box-shadow: var(--shadow); }
.course-preview-card { margin-bottom: 20px; }
.course-preview-card h2, .course-gate h2 { margin: 0 0 14px; color: var(--ink); font: 700 clamp(28px, 4vw, 38px)/1.35 var(--serif); }
.course-preview-card p, .course-gate p { line-height: 1.9; }
.course-preview-content p { margin: 0 0 18px; }
.course-preview-content p:last-child { margin-bottom: 0; }
.course-gate { background: #f7f5ef; }
.course-purchase-heading { max-width: 680px; margin-bottom: 30px; }
.course-purchase-heading > p:not(.eyebrow) { margin: 0; color: var(--muted); }
.course-purchase-options { display: grid; grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr); gap: 18px; scroll-margin-top: 92px; }
.course-purchase-option { position: relative; min-width: 0; min-height: 410px; display: flex; flex-direction: column; padding: 28px; border: 1px solid var(--line); background: var(--card); }
.course-purchase-option-all { border-color: rgba(47,75,64,.55); background: linear-gradient(145deg, #f4f7f2, #fffdf8 66%); box-shadow: inset 0 4px 0 var(--moss); }
.course-purchase-kicker { margin: 0 0 10px; color: var(--moss); font-size: 12px; font-weight: 800; letter-spacing: .14em; }
.course-purchase-option h3 { margin: 0; color: var(--ink); font: 700 clamp(26px, 3vw, 34px)/1.3 var(--serif); }
.course-purchase-price { display: flex; align-items: flex-start; gap: 4px; margin: 18px 0 10px; color: var(--cinnabar); font-variant-numeric: tabular-nums; line-height: 1; }
.course-purchase-price span { padding-top: 6px; font: 700 20px/1 var(--serif); }
.course-purchase-price strong { font: 800 clamp(38px, 5vw, 52px)/1 var(--serif); }
.course-purchase-average { margin: -2px 0 13px; color: var(--moss); font-size: 13px; font-weight: 700; }
.course-purchase-average strong { color: var(--cinnabar); font-variant-numeric: tabular-nums; }
.course-purchase-description { min-height: 3.8em; margin: 0; color: var(--muted); }
.course-purchase-benefits { display: grid; gap: 9px; margin: 18px 0 24px; padding: 0; list-style: none; }
.course-purchase-benefits li { padding-top: 9px; border-top: 1px solid var(--line-soft); color: var(--body); }
.course-purchase-benefits li::before { content: "◇"; margin-right: 8px; color: var(--cinnabar); }
.course-purchase-button { width: 100%; margin-top: auto; border-color: var(--moss); color: var(--moss); background: transparent; font-weight: 800; }
.course-purchase-button:hover { color: #fff; background: var(--moss); }
.course-purchase-option-all .course-purchase-button { color: #fff; border-color: var(--cinnabar); background: var(--cinnabar); }
.course-purchase-option-all .course-purchase-button:hover { border-color: #842f24; background: #842f24; }
.course-purchase-badge { position: absolute; right: 18px; top: 18px; padding: 5px 9px; color: #fff; background: var(--moss); font-size: 12px; font-weight: 800; letter-spacing: .08em; }
.course-purchase-notice { margin: 18px 0 0; padding: 11px 13px; color: #76521e; border-left: 3px solid #a37635; background: #fbf4e7; font-size: 13px; }
.course-purchase-notice[data-kind="error"] { color: #8f2f25; border-left-color: var(--cinnabar); background: #fff0ed; }
.course-purchase-notice[data-kind="success"] { color: var(--moss); border-left-color: var(--moss); background: #edf5f0; }
.course-pending-payment { display: flex; justify-content: space-between; gap: 18px; align-items: center; margin: 0 0 18px; padding: 16px 18px; border-left: 3px solid var(--moss); background: #edf5f0; }
.course-pending-payment[hidden] { display: none !important; }
.course-pending-payment-copy { display: grid; gap: 5px; color: var(--ink); }
.course-pending-payment-copy span { color: var(--muted); font-size: 13px; line-height: 1.65; }
.course-pending-payment-actions { flex: 0 0 auto; }
.course-pending-payment-resume { min-width: 128px; }
.course-checkout-controls { display: grid; grid-template-columns: minmax(260px, .7fr) minmax(0, 1fr); gap: 10px 18px; align-items: end; margin: 0 0 18px; padding: 18px 20px; border: 1px solid var(--line); background: rgba(255,253,248,.86); }
.course-checkout-controls fieldset { margin: 0; padding: 0; border: 0; }
.course-checkout-controls legend { margin-bottom: 8px; color: var(--ink); font-weight: 800; }
.course-payment-channels { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
.course-payment-channels label { cursor: pointer; }
.course-payment-channels input { position: absolute; opacity: 0; pointer-events: none; }
.course-payment-channels span { display: block; padding: 12px 16px; border: 1px solid var(--line); color: var(--body); background: var(--card); text-align: center; transition: border-color .2s ease, background .2s ease, color .2s ease; }
.course-payment-channels input:checked + span { border-color: var(--moss); color: var(--moss); background: #edf5f0; box-shadow: inset 0 0 0 1px var(--moss); }
.course-payment-channels input:focus-visible + span { outline: 2px solid var(--cinnabar); outline-offset: 2px; }
.course-checkout-hint { margin: 0; color: var(--moss); font-size: 13px; }
.course-checkout-terms { grid-column: 1 / -1; margin: 0; color: var(--muted); font-size: 12px; }
.course-checkout-terms a { color: var(--moss); text-decoration: underline; text-underline-offset: 3px; }
.course-purchase-button:disabled { cursor: not-allowed; opacity: .58; }
.course-access-status { margin: 0 0 18px; padding: 10px 14px; color: var(--moss); border-left: 3px solid var(--moss); background: #eef2ee; }
.course-access-status[data-kind="warning"] { color: #76521e; border-color: #a37635; background: #fbf4e7; }
.course-access-status[data-kind="error"] { color: #7e3028; border-color: #9d3b31; background: #f9ece9; }
.protected-article-content h2 { margin: 72px 0 24px; color: var(--ink); font: 700 clamp(30px, 3vw, 42px)/1.35 var(--serif); }
.protected-article-content h2:first-child { margin-top: 0; }
.protected-article-content h3 { margin: 42px 0 18px; color: var(--moss); font: 700 25px/1.4 var(--serif); }
.protected-article-content h4 { margin: 26px 0 12px; color: var(--ink); font-size: 18px; }
.protected-article-content p, .protected-article-content li { line-height: 2; }
.protected-article-content blockquote { margin: 24px 0; padding: 16px 20px; border-left: 3px solid var(--moss); background: #f3f5f1; }
.progress-chip { display: inline-flex; margin-top: 14px; padding: 6px 10px; color: var(--moss); border: 1px solid var(--line); background: rgba(255,253,248,.8); font-size: 13px; }

.reveal { opacity: 1; transform: none; }

@media (max-width: 1499px) {
  .course-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

@media (max-width: 1199px) {
  .header-inner { grid-template-columns: 190px minmax(0, 1fr) auto 42px; gap: 14px; }
  .desktop-nav { gap: 14px; }
  .desktop-nav a { font-size: 13px; }
  .course-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .article-shell { grid-template-columns: 190px minmax(0, 1fr); gap: 28px; }
  .course-access-shell { grid-template-columns: 190px minmax(0, 1fr); gap: 28px; }
}

@media (max-width: 960px) {
  .header-inner { grid-template-columns: 1fr auto 42px; }
  .desktop-nav { display: none; }
  .menu-button { display: block; }
  .hero { min-height: 520px; }
  .value-band-inner, .resource-layout { grid-template-columns: 1fr; }
  .learning-steps { grid-template-columns: 1fr; }
  .learning-steps li { min-height: 0; }
  .article-shell { display: block; width: min(calc(100% - 30px), var(--reading)); padding-top: 24px; }
  .article-toc { position: static; max-height: none; margin-bottom: 18px; padding: 16px; border: 1px solid var(--line); background: var(--card); }
  .article-toc nav { display: flex; flex-wrap: wrap; }
  .course-access-shell { display: block; width: min(calc(100% - 30px), var(--reading)); padding-top: 24px; }
  .purchase-card { grid-template-columns: 1fr; }
  .trust-layout, .help-shell { grid-template-columns: 1fr; gap: 30px; }
  .trust-toc, .help-aside { position: static; border-right: 0; }
  .trust-toc nav { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0 18px; }
  .about-hero-grid { grid-template-columns: 1fr; gap: 44px; }
  .about-section-heading { grid-template-columns: 160px 1fr; }
  .about-prose, .about-curriculum .policy-table, .about-section > .policy-table, .about-values ol { margin-left: 194px; }
}

@media (max-width: 899px) {
  .course-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 700px) {
  :root { --header-h: 64px; }
  body { font-size: 15px; }
  .pending-order-summary { align-items: flex-start; flex-direction: column; }
  .pending-order-actions { width: 100%; }
  .pending-order-action { flex: 1; text-align: center; }
  .pending-order-details { grid-template-columns: 1fr 1fr; }
  .pending-order-query { grid-column: 1 / -1; justify-self: stretch; }
  .header-inner, .section-inner, .value-band-inner, .footer-inner, .directory-hero-inner { width: min(calc(100% - 28px), var(--max)); }
  .brand-name { font-size: 23px; }
  .brand-mark { width: 32px; height: 32px; flex-basis: 32px; }
  .hero { min-height: auto; background-position: 58% bottom; }
  .hero-content { padding: 42px 0 54px; }
  .hero h1 { font-size: clamp(38px, 12vw, 54px); }
  .hero h1 { white-space: normal; }
  .hero-copy { font-size: 16px; white-space: normal; }
  .value-tags { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; text-align: left; }
  .hero-search { grid-template-columns: 1fr; }
  .hero-search .button { width: 100%; }
  .section { padding: 66px 0; }
  .section-heading { align-items: start; flex-direction: column; }
  .course-toolbar { align-items: stretch; flex-direction: column; gap: 12px; }
  .course-toolbar-access { align-items: stretch; flex-direction: column; }
  .course-access-summary { width: 100%; }
  .course-values, .resource-list, .footer-inner, .prompt-grid, .compare-grid { grid-template-columns: 1fr; }
  .compare-grid::after { display: none; }
  .course-card-actions { flex-direction: column; }
  .lesson-pagination { grid-template-columns: 1fr; }
  .footer-inner { gap: 28px; }
  .copyright { grid-column: 1; }
  .directory-search { grid-template-columns: 1fr; }
  .article-header-inner { width: calc(100% - 28px); }
  .article-nav a:first-child { display: none; }
  .article-hero { min-height: 390px; }
  .article-hero-content { width: calc(100% - 30px); }
  .course-hero-heading { gap: 14px; }
  .course-hero-problem { font-size: clamp(34px, 10vw, 48px); }
  .course-hero-solution { padding-top: 12px; font-size: 18px; line-height: 1.55; }
  .article-content { padding: 24px 18px; }
  .article-content h2 { margin-top: 54px; }
  .prompt-showcase, .media-compare { margin-left: -8px; margin-right: -8px; padding: 14px; }
  .prompt-card-header { display: block; }
  .prompt-card-actions { margin-top: 10px; flex-wrap: wrap; }
  .compare-heading { display: block; }
  .compare-heading span { display: block; margin-top: 5px; }
  .auth-nav .account-link:not(.account-link-primary) { display: none; }
  .account-link { padding: 7px 10px; }
  .order-history-heading { align-items: start; flex-direction: column; gap: 10px; }
  .order-history-heading > p { max-width: none; text-align: left; }
  .order-history-facts { grid-template-columns: 1fr 1fr; }
  .order-history-number { grid-column: 1 / -1; }
  .owned-course-grid { grid-template-columns: 1fr; }
  .payment-channel-grid { grid-template-columns: 1fr; }
  .purchase-form { padding: 20px 16px; }
  .course-preview-card, .course-gate, .protected-article-content { padding: 24px 18px; }
  .course-purchase-options { grid-template-columns: 1fr; }
  .course-purchase-option { min-height: 0; padding: 22px 18px; }
  .course-purchase-description { min-height: 0; }
  .course-checkout-controls { grid-template-columns: 1fr; padding: 16px; }
  .course-checkout-terms { grid-column: auto; }
  .course-pending-payment { align-items: stretch; flex-direction: column; }
  .course-pending-payment-resume { width: 100%; }
  .trust-hero-inner, .trust-layout, .about-hero-grid, .about-stats, .about-section, .about-values, .about-contact, .help-hero-inner, .help-shell { width: min(calc(100% - 28px), 1280px); }
  .trust-hero { min-height: 300px; }
  .trust-hero-inner { padding: 70px 0 44px; }
  .trust-toc nav { grid-template-columns: 1fr 1fr; }
  .document-intro, .document-section { grid-template-columns: 1fr; gap: 12px; }
  .document-section-accent { margin-inline: -14px; padding-inline: 14px; }
  .price-ledger, .policy-table > div { grid-template-columns: 1fr; }
  .about-hero { padding: 78px 0 66px; }
  .about-stats { grid-template-columns: 1fr 1fr; }
  .about-stats div:nth-child(2) { border-right: 0; }
  .about-stats div:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .about-section, .about-values, .about-contact { padding: 68px 0; }
  .about-section-heading { grid-template-columns: 1fr; gap: 6px; }
  .about-prose, .about-curriculum .policy-table, .about-section > .policy-table, .about-values ol { margin-left: 0; }
  .about-prose, .about-values ol { grid-template-columns: 1fr; }
  .about-contact { align-items: flex-start; flex-direction: column; }
  .help-hero { padding: 72px 0 58px; }
  .help-shell { padding-top: 40px; }
  .faq-item { grid-template-columns: 1fr; gap: 10px; }
}

@media (max-width: 599px) {
  .course-grid { grid-template-columns: 1fr; }
  .course-card-body { min-height: 148px; }
  .account-dashboard { width: min(calc(100% - 28px), 1040px); padding-top: 42px; }
  .account-content { padding: 22px 16px; }
  .order-history-card { padding: 18px 15px; }
  .order-history-card-head { align-items: start; flex-direction: column; gap: 12px; }
  .order-history-facts { grid-template-columns: 1fr; gap: 14px; }
  .order-history-number { grid-column: auto; grid-template-columns: 1fr; }
  .order-history-number dt { grid-column: auto; }
  .order-history-number button { width: 100%; margin-top: 4px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
}
.payment-qr-open {
  overflow: hidden;
}

.payment-qr-overlay {
  position: fixed;
  inset: 0;
  z-index: 10000;
  display: grid;
  place-items: center;
  padding: 24px;
  background: rgb(18 27 22 / 72%);
  backdrop-filter: blur(5px);
}

.payment-qr-dialog {
  position: relative;
  width: min(100%, 520px);
  max-height: calc(100dvh - 48px);
  overflow: auto;
  padding: 34px;
  border: 1px solid var(--ink-border, #d9d4c8);
  background: var(--paper, #f8f5ec);
  color: var(--ink, #171b18);
  box-shadow: 0 24px 70px rgb(0 0 0 / 28%);
}

.payment-qr-dialog h2 {
  margin: 4px 0 8px;
  font-size: clamp(1.65rem, 5vw, 2.25rem);
}

.payment-qr-close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 44px;
  height: 44px;
  border: 1px solid var(--ink-border, #d9d4c8);
  background: transparent;
  color: inherit;
  font: 400 28px/1 sans-serif;
  cursor: pointer;
}

.payment-qr-amount {
  margin: 0 0 18px;
  color: var(--ink-muted, #687069);
}

.payment-qr-amount strong {
  margin-left: 4px;
  color: var(--cinnabar, #aa3b2b);
  font-size: 1.35em;
}

.payment-qr-image-frame {
  width: min(100%, 360px);
  margin: 0 auto;
  padding: 10px;
  border: 1px solid var(--ink-border, #d9d4c8);
  background: #fff;
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: default;
}

.payment-qr-image {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1;
  object-fit: contain;
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: default;
  touch-action: manipulation;
}

.payment-qr-instruction {
  margin: 16px auto;
  line-height: 1.75;
  text-align: center;
  color: var(--ink-muted, #687069);
}

.payment-qr-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.payment-qr-actions [hidden] { display: none !important; }

.payment-qr-download,
.payment-qr-direct,
.payment-qr-check {
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  text-decoration: none;
}

.payment-qr-status {
  margin: 14px 0 0;
  min-height: 24px;
  text-align: center;
  color: var(--ink-muted, #687069);
}

.payment-qr-status[data-state="success"] {
  color: var(--pine, #1d543f);
}

.payment-qr-status[data-state="error"] {
  color: var(--cinnabar, #aa3b2b);
}

@media (max-width: 560px) {
  .payment-qr-overlay {
    align-items: end;
    padding: 0;
  }

  .payment-qr-dialog {
    width: 100%;
    max-height: 96dvh;
    padding: 28px 20px calc(24px + env(safe-area-inset-bottom));
    border-right: 0;
    border-bottom: 0;
    border-left: 0;
  }

  .payment-qr-actions {
    grid-template-columns: 1fr;
  }
}