/* Marketing site (platform mode, bare domain). An exercise book: a red margin rule,
   feint ruled lines, and notes written in the margin. No JavaScript. */

@font-face { font-family: 'Newsreader'; font-style: normal; font-weight: 400; font-display: swap; src: url('../vendor/fonts/newsreader-latin-400-normal.woff2') format('woff2'); }
@font-face { font-family: 'Newsreader'; font-style: italic; font-weight: 400; font-display: swap; src: url('../vendor/fonts/newsreader-latin-400-italic.woff2') format('woff2'); }
@font-face { font-family: 'Newsreader'; font-style: normal; font-weight: 600; font-display: swap; src: url('../vendor/fonts/newsreader-latin-600-normal.woff2') format('woff2'); }
@font-face { font-family: 'Atkinson Hyperlegible'; font-style: normal; font-weight: 400; font-display: swap; src: url('../vendor/fonts/atkinson-hyperlegible-latin-400-normal.woff2') format('woff2'); }
@font-face { font-family: 'Atkinson Hyperlegible'; font-style: normal; font-weight: 700; font-display: swap; src: url('../vendor/fonts/atkinson-hyperlegible-latin-700-normal.woff2') format('woff2'); }
@font-face { font-family: 'IBM Plex Mono'; font-style: normal; font-weight: 400; font-display: swap; src: url('../vendor/fonts/ibm-plex-mono-latin-400-normal.woff2') format('woff2'); }

:root {
  --paper: #F4F0E6;
  --sheet: #FCFAF5;
  --ink: #1C2430;
  --ink-2: #4B5563;
  --ink-3: #7B8290;
  --feint: #C9D8EA;
  --margin: #C8413B;
  --margin-soft: #F5DEDA;
  --pencil: #8A6A2F;
  --navy: #1F2E47;
  --navy-ink: #F4F0E6;
  --ok: #3F6F4D;
  --ok-soft: #E1ECDF;
  --rule: #DCD3C2;
  --serif: 'Newsreader', Georgia, 'Times New Roman', serif;
  --sans: 'Atkinson Hyperlegible', system-ui, sans-serif;
  --mono: 'IBM Plex Mono', ui-monospace, monospace;
  --gutter: 168px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #15191F; --sheet: #1C2129; --ink: #ECE7DC; --ink-2: #B5B9C0; --ink-3: #8C929C;
    --feint: #2A3646; --margin: #E0675F; --margin-soft: #3A2224; --pencil: #D2AE6A;
    --navy: #E7DFCF; --navy-ink: #15191F; --ok: #8CC39A; --ok-soft: #1E2E23; --rule: #313844;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
    --paper: #15191F; --sheet: #1C2129; --ink: #ECE7DC; --ink-2: #B5B9C0; --ink-3: #8C929C;
    --feint: #2A3646; --margin: #E0675F; --margin-soft: #3A2224; --pencil: #D2AE6A;
    --navy: #E7DFCF; --navy-ink: #15191F; --ok: #8CC39A; --ok-soft: #1E2E23; --rule: #313844;
    color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body.s-body { margin: 0; background: var(--paper); color: var(--ink); font: 400 17px/1.6 var(--sans); }
a { color: inherit; text-decoration-color: var(--margin); text-underline-offset: 3px; }
a:hover { color: var(--margin); }
:focus-visible { outline: 3px solid var(--margin); outline-offset: 2px; }
code { font: .86em var(--mono); background: var(--sheet); border: 1px solid var(--rule); padding: 1px 5px; border-radius: 3px; }
h1, h2, h3 { font-family: var(--serif); font-weight: 600; line-height: 1.15; letter-spacing: -.01em; }
h1 { font-size: clamp(2.2rem, 5vw, 3.6rem); margin: 0 0 16px; }
.s-skip { position: absolute; left: -999px; top: 8px; background: var(--navy); color: var(--navy-ink); padding: 8px 12px; z-index: 5; }
.s-skip:focus { left: 8px; }

/* Masthead */
.s-top { max-width: 1180px; margin: 0 auto; padding: 20px 24px; display: flex; align-items: center; justify-content: space-between; gap: 12px 24px; flex-wrap: wrap; }
.s-brand { font: 600 1.35rem var(--serif); text-decoration: none; display: inline-flex; align-items: center; gap: 10px; }
.s-brand-mark { display: inline-grid; place-items: center; width: 34px; height: 34px; border: 2px solid var(--margin); color: var(--margin); border-radius: 50%; font-size: 1.1rem; }
.s-nav { display: flex; align-items: center; gap: 4px 20px; flex-wrap: wrap; font-size: .96rem; }
.s-nav a { text-decoration: none; }
.s-nav a:not(.s-btn):hover { text-decoration: underline; }

/* The page: a red margin rule down the left, content to its right */
.s-main { position: relative; max-width: 1180px; margin: 0 auto; padding: 24px 24px 64px calc(var(--gutter) + 24px); }
.s-main::before { content: ''; position: absolute; top: 0; bottom: 0; left: calc(var(--gutter) - 4px); border-left: 1.5px solid var(--margin); border-right: 1.5px solid var(--margin); width: 5px; opacity: .55; pointer-events: none; }

.s-kicker { font: 400 .78rem var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--margin); margin: 0 0 10px; }
.s-kicker a { text-decoration: none; }
.s-lede { font-size: 1.16rem; color: var(--ink-2); max-width: 60ch; }
.s-fine { font-size: .88rem; color: var(--ink-3); }
.s-intro { max-width: 66ch; color: var(--ink-2); }
.s-after { margin-top: 28px; }

.s-btn { display: inline-block; background: var(--navy); color: var(--navy-ink); text-decoration: none; font: 700 .98rem var(--sans); padding: 12px 20px; border-radius: 3px; border: 0; cursor: pointer; box-shadow: 3px 3px 0 var(--margin); transition: transform .12s, box-shadow .12s; }
.s-btn:hover { color: var(--navy-ink); transform: translate(-1px, -1px); box-shadow: 4px 4px 0 var(--margin); }
.s-btn:active { transform: translate(2px, 2px); box-shadow: 1px 1px 0 var(--margin); }
.s-btn.small { padding: 7px 13px; font-size: .88rem; box-shadow: 2px 2px 0 var(--margin); }
.s-btn.ghost { background: transparent; color: var(--ink); border: 1.5px solid var(--ink); box-shadow: none; }
.s-link { font-weight: 700; margin-left: 14px; }
.s-cta { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 16px; margin: 26px 0 8px; }
.s-cta .s-link { margin-left: 0; }

/* Section headings: the number sits in the margin */
.s-h2 { position: relative; font-size: clamp(1.6rem, 3vw, 2.1rem); margin: 0 0 18px; }
.s-h2 > span { position: absolute; right: calc(100% + 40px); top: .1em; font: italic 400 1.3rem var(--serif); color: var(--margin); }
.s-h3 { font-size: 1.3rem; margin: 28px 0 10px; }
.s-section, .s-band { margin: 72px 0; }

/* Hero */
.s-hero { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); gap: 40px; align-items: center; padding: 28px 0 24px; }
.s-hero h1 em { font-style: italic; font-weight: 400; color: var(--margin); }
.s-specimen { margin: 0; display: grid; grid-template-columns: minmax(0, 1fr) 150px; gap: 14px; align-items: start; }
.s-sheet { background: var(--sheet) repeating-linear-gradient(to bottom, transparent 0 27px, var(--feint) 27px 28px); background-position: 0 14px; padding: 18px 22px 20px; border: 1px solid var(--rule); box-shadow: 0 1px 0 var(--rule), 0 14px 32px -18px rgba(20, 24, 30, .35); transform: rotate(-.6deg); font-size: .95rem; line-height: 28px; }
.s-sheet h2 { font-size: 1.35rem; margin: 0; line-height: 28px; }
.s-sheet p { margin: 0 0 0; }
.s-sheet-meta { font: .72rem/28px var(--mono); color: var(--ink-3); letter-spacing: .06em; }
.s-sheet mark { background: color-mix(in srgb, var(--margin) 18%, transparent); color: inherit; padding: 0 2px; }
.s-sheet u { text-decoration: underline 1.5px var(--ok); text-underline-offset: 3px; }
.s-sheet-q { color: var(--pencil); font-style: italic; }
.s-notes { list-style: none; margin: 18px 0 0; padding: 0; display: grid; gap: 14px; counter-reset: n; }
.s-notes li { position: relative; font: italic .92rem/1.35 var(--serif); color: var(--pencil); padding-left: 22px; counter-increment: n; }
.s-notes li::before { content: counter(n); position: absolute; left: 0; top: 1px; width: 16px; height: 16px; border-radius: 50%; border: 1px solid var(--pencil); font: normal .62rem/15px var(--mono); text-align: center; }
.s-notes span { display: block; font: normal .66rem var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); }

/* How it works */
.s-steps { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0; border-top: 1px solid var(--ink); }
.s-steps > div { padding: 16px 18px 6px 0; border-right: 1px dashed var(--rule); padding-left: 18px; }
.s-steps > div:first-child { padding-left: 0; }
.s-steps > div:last-child { border-right: 0; }
.s-steps h3 { font-size: 1.25rem; margin: 0 0 6px; }
.s-steps p { margin: 0; font-size: .95rem; color: var(--ink-2); }

/* Subject toolkits */
.s-kits { display: grid; grid-template-columns: repeat(auto-fill, minmax(290px, 1fr)); gap: 16px; margin-top: 22px; }
.s-kit { background: var(--sheet); border: 1px solid var(--rule); border-top: 4px solid var(--acc); padding: 16px 18px 12px; }
.s-kit > a { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.s-kit h3 { margin: 0; font-size: 1.2rem; }
.s-kit ul { margin: 10px 0; padding-left: 1.1em; font-size: .92rem; color: var(--ink-2); }
.s-kit li { margin-bottom: 6px; }
.s-kit li b { color: var(--ink); }
.s-kit-foot { margin: 0; font-size: .82rem; color: var(--ink-3); }
.s-glyph { display: inline-grid; place-items: center; min-width: 32px; height: 32px; padding: 0 4px; border-radius: 3px; background: var(--acc, var(--navy)); color: #fff; font: 600 1.05rem var(--serif); flex: none; }
.s-glyph.big { min-width: 54px; height: 54px; font-size: 1.8rem; vertical-align: middle; margin-right: 6px; }

/* Contents list with dot leaders */
.s-toc { list-style: none; padding: 0; margin: 0 0 14px; }
.s-toc li a { display: flex; align-items: center; gap: 12px; padding: 9px 0; text-decoration: none; border-bottom: 1px solid var(--rule); }
.s-toc li a:hover .s-toc-name { color: var(--acc); }
.s-toc-name { font: 600 1.08rem var(--serif); display: flex; flex-direction: column; }
.s-toc-name small { font: 400 .8rem var(--sans); color: var(--ink-3); }
.s-toc-dots { flex: 1; border-bottom: 2px dotted var(--rule); transform: translateY(4px); min-width: 20px; }
.s-status { font: .7rem var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--ink-3); white-space: nowrap; }
.s-status.live { color: var(--ok); font-weight: 400; }
.s-status.live::before { content: '● '; }

.s-split { display: grid; grid-template-columns: minmax(0, 1.6fr) minmax(240px, 1fr); gap: 40px; align-items: start; }
.s-split-even { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.s-margin-note { background: var(--sheet); border-left: 3px solid var(--margin); padding: 16px 20px; font-size: .95rem; }
.s-margin-note h3 { margin: 0 0 8px; font-size: 1.15rem; }
.s-margin-note ul { margin: 0; padding-left: 1.1em; }
.s-margin-note li { margin-bottom: 6px; }

.s-closing { margin: 80px 0 20px; padding: 36px 0; border-top: 1px solid var(--ink); border-bottom: 1px solid var(--ink); text-align: left; }
.s-closing h2 { font-size: clamp(1.6rem, 3.2vw, 2.3rem); margin: 0 0 8px; }

/* Subjects index */
.s-head { margin: 12px 0 30px; }
.s-clusters { columns: 2 380px; column-gap: 48px; }
.s-cluster { break-inside: avoid; margin-bottom: 30px; }
.s-cluster h2 { font: .78rem var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--margin); margin: 0 0 4px; }

/* Subject page */
.s-subject-head h1 { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.s-tools { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.s-tool { background: var(--sheet); border: 1px solid var(--rule); padding: 12px 16px; }
.s-tool > div { display: flex; justify-content: space-between; gap: 12px; align-items: baseline; }
.s-tool > div span { font: .68rem var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--ink-3); white-space: nowrap; }
.s-tool.st-live { border-left: 3px solid var(--ok); }
.s-tool.st-live > div span { color: var(--ok); }
.s-tool p { margin: 4px 0 0; font-size: .93rem; color: var(--ink-2); }
.s-list { padding-left: 1.2em; margin: 0; }
.s-list li { margin-bottom: 5px; }
.s-callout { background: var(--ok-soft); border-left: 3px solid var(--ok); padding: 12px 16px; margin: 0 0 28px; max-width: 80ch; }
.s-callout.warn { background: var(--margin-soft); border-left-color: var(--margin); }

/* Pricing */
.s-plans { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; align-items: stretch; }
@media (max-width: 650px) { .s-plans { grid-template-columns: minmax(0, 1fr); } }
.s-plan { background: var(--sheet); border: 1px solid var(--rule); padding: 22px 22px 18px; display: flex; flex-direction: column; }
.s-plan.hl { border: 2px solid var(--ink); box-shadow: 6px 6px 0 var(--margin); }
.s-plan h2 { margin: 0 0 4px; font-size: 1.4rem; }
.s-plan-sum { margin: 0 0 14px; color: var(--ink-2); font-size: .95rem; }
.s-price { margin: 0; display: flex; align-items: baseline; gap: 8px; }
.s-price b { font: 600 2.4rem var(--serif); }
.s-price span { color: var(--ink-3); }
.s-price-alt { margin: 2px 0 0; font-size: .9rem; color: var(--ink-2); }
.s-plan ul { margin: 16px 0 18px; padding-left: 1.1em; flex: 1; font-size: .95rem; }
.s-plan li { margin-bottom: 5px; }
.s-plan .s-btn { align-self: flex-start; }

/* FAQ */
.s-faq { max-width: 760px; border-top: 1px solid var(--ink); }
.s-q { border-bottom: 1px solid var(--rule); }
.s-q summary { cursor: pointer; font: 600 1.15rem var(--serif); padding: 16px 30px 16px 0; list-style: none; position: relative; }
.s-q summary::-webkit-details-marker { display: none; }
.s-q summary::after { content: '+'; position: absolute; right: 4px; top: 12px; font: 400 1.4rem var(--mono); color: var(--margin); }
.s-q[open] summary::after { content: '−'; }
.s-q p { margin: 0 0 18px; color: var(--ink-2); max-width: 66ch; }

/* Forms */
.s-form-wrap { display: grid; grid-template-columns: minmax(0, 1fr) minmax(300px, 440px); gap: 48px; align-items: start; padding-top: 12px; }
.s-form-intro p { color: var(--ink-2); max-width: 44ch; }
.s-form { background: var(--sheet); border: 1px solid var(--rule); padding: 24px; display: grid; gap: 16px; box-shadow: 6px 6px 0 var(--feint); }
.s-form label { display: grid; gap: 6px; font-weight: 700; font-size: .93rem; }
.s-form input:not([type=checkbox]), .s-form select { font: 400 1rem var(--sans); padding: 10px 12px; border: 1.5px solid var(--rule); border-radius: 3px; background: var(--paper); color: var(--ink); width: 100%; }
.s-form input:focus, .s-form select:focus { border-color: var(--navy); outline: none; box-shadow: 0 0 0 3px color-mix(in srgb, var(--margin) 30%, transparent); }
.s-form small { font-weight: 400; color: var(--ink-3); }
.s-form .s-check { display: flex; gap: 10px; align-items: flex-start; font-weight: 400; }
.s-form .s-check input { margin-top: 5px; width: 18px; height: 18px; accent-color: var(--navy); }
.s-form .s-btn { justify-self: start; }
.s-form .s-fine { margin: 0; }
.s-hp { position: absolute !important; left: -10000px; width: 1px; height: 1px; overflow: hidden; }
.s-error { margin: 0; background: var(--margin-soft); border-left: 3px solid var(--margin); padding: 10px 12px; font-weight: 700; }

/* Account */
.s-notebooks { list-style: none; padding: 0; margin: 0 0 12px; display: grid; gap: 8px; }
.s-notebooks li { display: flex; align-items: center; gap: 12px; background: var(--sheet); border: 1px solid var(--rule); padding: 10px 14px; }
.s-notebooks li > div { flex: 1; display: flex; flex-direction: column; }
.s-notebooks small { color: var(--ink-3); }
.s-notebooks .s-empty { display: block; color: var(--ink-2); }
.s-table { width: 100%; border-collapse: collapse; font-size: .94rem; margin-bottom: 10px; }
.s-table th { text-align: left; font: .7rem var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--ink-3); border-bottom: 1px solid var(--ink); padding: 6px 8px 6px 0; }
.s-table td { border-bottom: 1px solid var(--rule); padding: 8px 8px 8px 0; }
.s-table tr.off td { color: var(--ink-3); }
.s-margin-note form { margin-top: 16px; }

.s-prose { max-width: 70ch; }
.s-narrow { max-width: 620px; padding: 40px 0; }

/* Footer */
.s-foot { max-width: 1180px; margin: 0 auto; padding: 24px 24px 40px calc(var(--gutter) + 24px); border-top: 1px solid var(--rule); font-size: .88rem; color: var(--ink-3); }
.s-foot p { margin: 4px 0; }
.s-foot a { margin-right: 14px; }

/* Writing templates */
.s-tpl-how { max-width: 760px; margin-bottom: 34px; }
.s-tpl-how ol { padding-left: 1.3em; margin: 12px 0; }
.s-tpl-how li { margin-bottom: 8px; }
.s-tpl-how code { font: .88em var(--mono); background: var(--sheet); border: 1px solid var(--rule); padding: 0 4px; }
.s-tpls { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 16px; margin: 18px 0 36px; }
.s-tpl { background: var(--sheet); border: 1px solid var(--rule); border-left: 4px solid var(--margin); padding: 14px 18px; display: flex; flex-direction: column; }
.s-tpl h3 { margin: 2px 0 6px; font-size: 1.2rem; }
.s-tpl .s-tpl-sum { margin: 0 0 12px; font-size: .93rem; color: var(--ink-2); }
.s-tpl .s-tpl-style { font: .7rem var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--pencil); margin: 0; }
.s-tpl .s-tpl-foot { margin: auto 0 0; display: flex; align-items: center; justify-content: space-between; gap: 10px; font-size: .82rem; color: var(--ink-3); }
.s-btn.s-btn-sm { padding: 7px 12px; font-size: .85rem; box-shadow: 2px 2px 0 var(--margin); white-space: nowrap; }

/* Policy pages and FAQ groups */
.s-legal-nav { display: flex; flex-wrap: wrap; gap: 16px; font-size: .92rem; margin-top: 10px; }
.s-legal-nav b { color: var(--margin); }
.s-legal { max-width: 780px; }
.s-legal .s-table { width: 100%; margin: 10px 0 18px; font-size: .93rem; }
.s-legal .s-table td, .s-legal .s-table th { vertical-align: top; padding: 8px 10px 8px 0; }
.s-legal code { font: .85em var(--mono); }
.s-faq-h { margin-top: 30px; }

/* Admin */
.a-head { margin-bottom: 18px; }
.a-tabs { display: flex; gap: 18px; border-bottom: 1px solid var(--ink); margin-top: 14px; }
.a-tabs a { text-decoration: none; padding: 6px 0; font-weight: 700; }
.a-tabs a:hover { color: var(--margin); }
.a-stats { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 12px; margin-bottom: 26px; }
.a-stat { background: var(--sheet); border: 1px solid var(--rule); border-top: 3px solid var(--margin); padding: 12px 14px; }
.a-stat b { display: block; font: 600 1.8rem var(--serif); }
.a-stat span { font-size: .82rem; color: var(--ink-3); }
.a-cols { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 28px; margin-top: 22px; }
.a-kv th { text-align: left; font-weight: 400; color: var(--ink-3); padding-right: 12px; white-space: nowrap; }
.a-search { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 8px; }
.a-search input[type=search] { flex: 1 1 260px; }
.a-search input, .a-search select, .a-inline input, .a-inline select, .a-update input { font: inherit; padding: 6px 8px; border: 1px solid var(--rule); background: var(--sheet); color: var(--ink); border-radius: 3px; }
.a-inline { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; margin: 4px 0 10px; }
.a-grant label { display: inline-flex; align-items: center; gap: 6px; }
.a-update label { display: block; margin: 10px 0; font-weight: 700; }
.a-update label input { display: block; margin-top: 4px; font-weight: 400; max-width: 100%; }
.a-users td, .a-subs td { vertical-align: top; }
.a-subs tr.off { opacity: .6; }
.a-tag { display: inline-block; font: .66rem var(--mono); text-transform: uppercase; letter-spacing: .08em; border: 1px solid var(--rule); padding: 0 5px; margin-left: 4px; color: var(--ink-3); }
.a-tag.warn { color: var(--margin); border-color: var(--margin); }
.s-btn.danger { color: var(--margin); }
.a-pages a, .a-pages b { margin-right: 6px; }
.a-body .s-table { width: 100%; }
@media (max-width: 700px) { .a-subs, .a-subs tbody, .a-subs tr, .a-subs td { display: block; } .a-subs thead { display: none; } .a-subs tr { border-bottom: 1px solid var(--rule); padding: 8px 0; } }

/* Narrower screens: the margin shrinks to a thin rule, margin numbers move inline */
@media (max-width: 980px) {
  :root { --gutter: 28px; }
  .s-main { padding-left: calc(var(--gutter) + 18px); padding-right: 18px; }
  .s-main::before { left: 12px; }
  .s-foot { padding-left: calc(var(--gutter) + 18px); }
  .s-h2 > span { position: static; margin-right: 8px; }
  .s-hero, .s-split, .s-split-even, .s-form-wrap { grid-template-columns: minmax(0, 1fr); gap: 28px; }
  .s-steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .s-steps > div:nth-child(2) { border-right: 0; }
  .s-steps > div:nth-child(3) { padding-left: 0; }
}
@media (max-width: 560px) {
  body.s-body { font-size: 16px; }
  .s-top { padding: 14px 16px; }
  .s-main { padding: 12px 16px 48px 36px; }
  .s-main::before { left: 10px; width: 4px; }
  .s-foot { padding: 20px 16px 32px 36px; }
  .s-specimen { grid-template-columns: minmax(0, 1fr); }
  .s-notes { margin-top: 0; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .s-steps { grid-template-columns: minmax(0, 1fr); }
  .s-steps > div { border-right: 0; padding-left: 0; border-bottom: 1px dashed var(--rule); padding-bottom: 12px; }
  .s-link { margin-left: 0; }
  .s-kits { grid-template-columns: minmax(0, 1fr); }
  .s-nav { gap: 4px 14px; }
}
@media (prefers-reduced-motion: reduce) { .s-btn { transition: none; } .s-sheet { transform: none; } }

/* Subject guide summary on subject pages */
.s-guide { margin: 36px 0 8px; }
.s-guide .s-status { margin-left: 8px; vertical-align: 3px; color: var(--pencil); }
.s-guide-areas { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 0 28px; margin-top: 14px; border-top: 1px solid var(--ink); }
.s-guide-areas > div { padding: 12px 0; border-bottom: 1px dashed var(--rule); }
.s-guide-areas h3 { font-size: 1.05rem; margin: 0 0 4px; }
.s-guide-areas p { margin: 0; font-size: .88rem; color: var(--ink-2); line-height: 1.5; }

/* Referral box on the account page */
.s-refer { margin: 40px 0 8px; padding: 22px 24px; background: var(--sheet); border: 1px solid var(--rule); border-top: 4px solid var(--margin); }
.s-refer > p { max-width: 75ch; }
.s-refer-grid { display: grid; grid-template-columns: minmax(0, 1fr) 220px; gap: 24px 32px; align-items: start; }
.s-copyrow { display: flex; gap: 8px; flex-wrap: wrap; margin: 4px 0 10px; }
.s-copyrow input { flex: 1 1 260px; min-width: 0; font-family: var(--mono, monospace); font-size: .9rem; }
.s-code { font-family: var(--mono, monospace); letter-spacing: .12em; font-size: 1.05rem; }
.s-link-btn { background: none; border: 0; padding: 0; color: var(--link, inherit); text-decoration: underline; cursor: pointer; font: inherit; }
.s-opt { color: var(--ink-3); font-weight: 400; }
.s-invite { margin-top: 18px; max-width: 460px; }
.s-invite .s-h4 { font-size: 1rem; margin: 0 0 6px; }
.s-qr { margin: 0; text-align: center; }
.s-qr-code { background: #fff; border: 1px solid var(--rule); border-radius: 6px; padding: 6px; }
.s-qr-code svg { display: block; width: 100%; height: auto; }
.s-qr figcaption { font-size: .82rem; color: var(--ink-2); margin-top: 8px; }
@media (max-width: 700px) {
  .s-refer { padding: 18px 16px; }
  .s-refer-grid { grid-template-columns: 1fr; }
  .s-qr { max-width: 240px; margin: 0 auto; }
}

/* Shared note page (/n/TOKEN) */
.s-shared { max-width: 780px; }
.s-share-cta { background: var(--sheet); border: 1px solid var(--rule); border-left: 4px solid var(--margin); padding: 16px 20px; margin: 0 0 28px; }
.s-share-cta p { margin: 0 0 10px; }
.s-share-cta p:last-child { margin-bottom: 0; }
.s-note-part { margin: 0 0 28px; }
.s-note-body { line-height: 1.65; }
.s-note-body h1, .s-note-body h2, .s-note-body h3 { font-family: var(--serif); margin: 1.2em 0 .4em; }
.s-note-body ul, .s-note-body ol { padding-left: 1.4em; }
.s-note-body blockquote { border-left: 3px solid var(--rule); margin: 1em 0; padding: 2px 14px; color: var(--ink-2); }
.s-note-body .note-exam, .s-note-body .note-def, .s-note-body .note-confused, .s-note-body .note-key, .s-note-body .note-question, .s-note-body .note-mine { border-left: 3px solid var(--margin); background: var(--margin-soft); padding: 6px 12px; }
.s-note-body .note-def { border-left-color: var(--ok); background: var(--ok-soft); }
.s-note-body pre { white-space: pre-wrap; background: var(--sheet); padding: 10px 12px; border: 1px solid var(--rule); }
.shared-img { display: inline-block; font-size: .85rem; color: var(--ink-3); border: 1px dashed var(--rule); padding: 2px 8px; }
.s-caps { list-style: none; padding: 0; margin: 0; }
.s-caps li { padding: 8px 0; border-bottom: 1px solid var(--rule); }
.s-caps small { display: block; color: var(--ink-2); margin-top: 2px; }
.s-cap-kind { display: inline-block; font: 700 .68rem var(--sans); letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); min-width: 8.5em; }
.s-status.soon { color: var(--margin); }

/* ProtocolDock band in the footer */
.s-pd { display: grid; grid-template-columns: auto 1fr auto; gap: 12px 24px; align-items: center; padding: 16px 0 18px; margin-bottom: 14px; border-bottom: 1px solid var(--rule); }
.s-pd-mark { display: grid; line-height: 1.2; }
.s-pd-mark a { text-decoration: none; color: var(--ink); font-family: var(--serif); font-size: 1.15rem; }
.s-pd-mark span { font-size: .75rem; color: var(--ink-3); letter-spacing: .06em; text-transform: uppercase; }
.s-pd p { margin: 0; max-width: 70ch; font-size: .92rem; }
@media (max-width: 700px) { .s-pd { grid-template-columns: 1fr; } }
.s-write-grid { display: grid; grid-template-columns: minmax(0, 2fr) minmax(0, 1fr); gap: 12px 32px; align-items: center; }
.s-write-grid p { margin: 0; max-width: 70ch; }
@media (max-width: 700px) { .s-write-grid { grid-template-columns: 1fr; } }
.s-write-cta { display: grid; gap: 8px; justify-items: start; }
.s-foot .s-pd p a { margin: 0; padding: 0; }

/* Deeper analysis page */
.s-margin-note ul + h3 { margin-top: 18px; }

/* Deeper analysis page: a faithful rendering of the in-app Question interpreter (app.css look), scoped to .qa */
.qa {
  --q-paper: #F3EEE4; --q-sheet: #FBF8F2; --q-sheet-2: #F6F1E7; --q-ink: #1D2633; --q-ink-2: #4A5463; --q-ink-3: #7A808B;
  --q-rule: #D9CFBE; --q-rule-soft: #E6DECF; --q-navy: #23324A; --q-navy-ink: #F4EFE3; --q-oxblood: #8E3B46; --q-link: #2B5A8A;
  --q-sage: #4F7A5B; --q-sage-soft: #E2ECDF; --q-ochre: #A87A1F; --q-hl: #F5E39B; --q-hl-soft: #FBF1C9; --q-accent: #3E5C76;
  --q-v: #F2D4D0; --q-t: #D6E4F2; --q-s: #DCEBD8;
  --q-shadow: 0 1px 0 rgba(60, 45, 20, .06), 0 6px 18px -10px rgba(60, 45, 20, .28);
  margin: 22px 0 0; font: 400 16px/1.55 var(--sans); color: var(--q-ink);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .qa {
    --q-paper: #14171C; --q-sheet: #1B1F26; --q-sheet-2: #20252D; --q-ink: #ECE6DA; --q-ink-2: #BDB6A8; --q-ink-3: #8C8679;
    --q-rule: #343A44; --q-rule-soft: #2A2F37; --q-navy: #D9D2C3; --q-navy-ink: #14171C; --q-oxblood: #D8848F; --q-link: #8DB5E0;
    --q-sage: #8FC19C; --q-sage-soft: #1F2E24; --q-ochre: #D9B35A; --q-hl: #5E4E1C; --q-hl-soft: #3A3219; --q-accent: #8DB5E0;
    --q-v: #4A2A2E; --q-t: #22344A; --q-s: #243826;
    --q-shadow: 0 1px 0 rgba(0,0,0,.4), 0 10px 24px -12px rgba(0,0,0,.6);
  }
}
:root[data-theme="dark"] .qa {
    --q-paper: #14171C; --q-sheet: #1B1F26; --q-sheet-2: #20252D; --q-ink: #ECE6DA; --q-ink-2: #BDB6A8; --q-ink-3: #8C8679;
    --q-rule: #343A44; --q-rule-soft: #2A2F37; --q-navy: #D9D2C3; --q-navy-ink: #14171C; --q-oxblood: #D8848F; --q-link: #8DB5E0;
    --q-sage: #8FC19C; --q-sage-soft: #1F2E24; --q-ochre: #D9B35A; --q-hl: #5E4E1C; --q-hl-soft: #3A3219; --q-accent: #8DB5E0;
    --q-v: #4A2A2E; --q-t: #22344A; --q-s: #243826;
    --q-shadow: 0 1px 0 rgba(0,0,0,.4), 0 10px 24px -12px rgba(0,0,0,.6);
  }
.qa-row { display: grid; grid-template-columns: minmax(0, 1fr) 220px; column-gap: 26px; }
.qa-cell { background: var(--q-paper); border-left: 1px solid var(--q-rule); border-right: 1px solid var(--q-rule); padding: 0 26px 22px; min-width: 0; }
.qa-row:last-child .qa-cell { border-bottom: 1px solid var(--q-rule); border-radius: 0 0 10px 10px; padding-bottom: 26px; }
.qa-bar { display: flex; align-items: center; gap: 12px; background: var(--q-sheet-2); border: 1px solid var(--q-rule); border-radius: 10px 10px 0 0; padding: 9px 14px; font: .78rem var(--mono); color: var(--q-ink-3); }
.qa-bar i { width: 10px; height: 10px; border-radius: 50%; background: var(--q-rule); display: inline-block; margin-right: 5px; }
.qa-bar span { background: var(--q-sheet); border: 1px solid var(--q-rule-soft); border-radius: 20px; padding: 2px 12px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.qa-row-first .qa-cell { padding-top: 24px; }
.qa-note { font-size: .86rem; line-height: 1.5; color: var(--ink-2); padding-top: 4px; position: relative; }
.qa-note b { display: block; font: 600 1rem var(--serif); color: var(--ink); margin-bottom: 2px; }
.qa-note p { margin: 0 0 6px; }
.qa-n { display: inline-grid; place-items: center; width: 22px; height: 22px; border-radius: 50%; border: 1.5px solid var(--margin); color: var(--margin); font: 700 .74rem var(--sans); margin-right: 6px; vertical-align: 1px; }
.qa-cell > .qa-n { position: relative; float: right; margin: 2px -14px 0 8px; background: var(--q-paper); }
.qa h1, .qa h2, .qa h3, .qa h4 { font-family: var(--serif); font-weight: 500; line-height: 1.18; margin: 0 0 .5em; letter-spacing: -.005em; color: var(--q-ink); }
.qa h1 { font-size: 2rem; }
.qa h3 { font-size: 1.22rem; }
.qa h4 { font-size: 1.05rem; font-weight: 600; }
.qa p { margin: 0 0 .9em; }
.qa ul, .qa ol { margin: 0 0 .6em; padding-left: 1.4em; }
.qa li { margin: 2px 0; }
.qa a { color: var(--q-link); text-underline-offset: 2px; }
.qa .small { font-size: .85rem; }
.qa .muted { color: var(--q-ink-3); }
.qa-eyebrow { font: 700 .72rem var(--sans); letter-spacing: .16em; text-transform: uppercase; color: var(--q-oxblood); margin-bottom: 6px; }
.qa-sub { color: var(--q-ink-2); max-width: 70ch; margin-bottom: 18px !important; }
.qa-label { display: block; font: 700 .8rem var(--sans); color: var(--q-ink-2); margin-bottom: 5px; }
.qa-input { width: 100%; box-sizing: border-box; min-height: 84px; background: var(--q-sheet); border: 1.5px solid var(--q-rule); border-radius: 5px; padding: 8px 10px; font: inherit; line-height: 1.5; color: var(--q-ink); resize: vertical; }
.qa-select { width: 100%; box-sizing: border-box; min-height: 40px; background: var(--q-sheet); border: 1.5px solid var(--q-rule); border-radius: 5px; padding: 8px 10px; font: inherit; color: var(--q-ink); }
.qa-actions { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin: 14px 0 0; }
.qa-actions .qa-select { width: auto; min-width: 240px; flex: 0 1 260px; }
.qa-btn { display: inline-flex; align-items: center; gap: 7px; padding: 8px 15px; border-radius: 5px; border: 1.5px solid var(--q-navy); background: var(--q-navy); color: var(--q-navy-ink); font: 700 .93rem var(--sans); cursor: pointer; line-height: 1.25; }
.qa-btn:hover { background: #31466A; border-color: #31466A; }
.qa-btn.ghost { background: transparent; color: var(--q-ink); border-color: var(--q-rule); }
.qa-btn[disabled] { opacity: .6; cursor: progress; }
.qa-btn svg { width: 16px; height: 16px; fill: currentColor; }
.qa-sheet { background: var(--q-sheet); border: 1px solid var(--q-rule-soft); border-radius: 9px; box-shadow: var(--q-shadow); padding: 20px 22px; }
.qa-sheet.tight { padding: 12px 16px; box-shadow: none; }
.qa-callout { border-left: 4px solid var(--q-sage); background: var(--q-sage-soft); padding: 12px 16px; border-radius: 0 5px 5px 0; }
.qa-callout-title { font: 700 .72rem var(--sans); letter-spacing: .14em; text-transform: uppercase; margin-bottom: 4px; color: var(--q-sage); }
.qa-callout p { font-size: 1.05rem; margin: 6px 0 2px; }
.qa-hl { font: 400 1.22rem/1.75 var(--serif); padding: 16px 20px; background: var(--q-sheet); border-radius: 9px; border: 1px solid var(--q-rule-soft); }
.qa-hl .qv { background: var(--q-v); border-bottom: 2px solid var(--q-oxblood); padding: 0 2px; }
.qa-hl .qt { background: var(--q-t); border-bottom: 2px solid var(--q-link); padding: 0 2px; }
.qa-hl .qs { background: var(--q-s); border-bottom: 2px solid var(--q-sage); padding: 0 2px; }
.qa-hl .qc { background: var(--q-hl); border-bottom: 2px solid var(--q-ochre); padding: 0 2px; }
.qa-legend { display: flex; gap: 14px; flex-wrap: wrap; font-size: .82rem; margin-top: 8px; color: var(--q-ink); }
.qa-legend span { display: inline-flex; gap: 5px; align-items: center; }
.qa-legend i { width: 14px; height: 10px; border-radius: 2px; display: inline-block; }
.qa-legend .qv { background: var(--q-v); border-bottom: 2px solid var(--q-oxblood); }
.qa-legend .qt { background: var(--q-t); border-bottom: 2px solid var(--q-link); }
.qa-legend .qs { background: var(--q-s); border-bottom: 2px solid var(--q-sage); }
.qa-legend .qc { background: var(--q-hl); border-bottom: 2px solid var(--q-ochre); }
.qa-plan { padding-left: 1.3em; display: grid; gap: 8px; margin: 0; }
.qa-plan li b { display: block; }
.qa-mnote { background: var(--q-hl-soft); border-left: 3px solid var(--q-ochre); padding: 14px 16px; border-radius: 0 5px 5px 0; }
.qa-mnote h3 { margin-bottom: 8px; }
.qa-mnote ol { margin: 0; }
.qa details.qa-sheet { padding: 12px 16px; box-shadow: none; margin-top: 12px; }
.qa details.qa-sheet + details.qa-sheet { margin-top: 10px; }
.qa summary { cursor: pointer; font-weight: 700; }
.qa-deep { background: var(--q-sheet); border: 1px solid var(--q-rule-soft); border-left: 3px solid var(--q-accent); padding: 4px 22px 4px; border-top: 0; border-bottom: 0; }
.qa-deep.start { border-top: 1px solid var(--q-rule-soft); border-radius: 9px 9px 0 0; padding-top: 20px; }
.qa-deep.end { border-bottom: 1px solid var(--q-rule-soft); border-radius: 0 0 9px 9px; padding-bottom: 18px; box-shadow: var(--q-shadow); }
.qa-deep.start.end { border-radius: 9px; }
.qa-deep > h3:first-child { display: flex; align-items: center; gap: 7px; margin-top: 0; }
.qa-deep > h3 svg { width: 16px; height: 16px; fill: currentColor; }
.qa-lede { font-size: 1.04rem; }
.qa-block { margin-top: 12px; }
.qa-block h4 { margin: 0 0 4px; }
.qa-block dl { margin: 0; }
.qa-block dt { font-weight: 700; margin-top: 6px; }
.qa-block dd { margin: 0 0 4px; }
.qa-block > ol > li > ul { margin: 2px 0 8px; }
.qa-section-label { display: flex; align-items: center; gap: 12px; font: 700 .72rem var(--sans); letter-spacing: .16em; text-transform: uppercase; color: var(--q-ink-2); margin: 4px 0 10px; }
.qa-section-label::after { content: ''; flex: 1; height: 1px; background: var(--q-rule); }
.qa-row-item { padding: 8px 0; border-top: 1px dotted var(--q-rule); }
.qa-row-item:first-of-type { border-top: 0; }
.qa-row-item p { margin: 2px 0 0; }
.qa-gap { height: 18px; }
.qa-run { margin-top: 6px; }
.qa-progress { height: 4px; background: var(--q-rule-soft); border-radius: 4px; overflow: hidden; margin: 12px 0 4px; max-width: 360px; }
.qa-progress span { display: block; height: 100%; width: 0; background: var(--q-accent); transition: width 5s linear; }
.qa-progress.go span { width: 100%; }
.qa-sim-tag { display: inline-block; font: 700 .68rem var(--sans); letter-spacing: .12em; text-transform: uppercase; color: var(--q-oxblood); border: 1px solid currentColor; border-radius: 3px; padding: 1px 6px; margin-left: 8px; vertical-align: 2px; }
.qa-out:empty { display: none; }
.qa-out { margin-top: 22px; display: grid; gap: 18px; }
.qa-fade { animation: qa-in .35s ease-out; }
@keyframes qa-in { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }
.qa-pick { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 8px; margin: 0 0 16px; }
.qa-pick button { text-align: left; background: var(--q-sheet); border: 1.5px solid var(--q-rule); border-radius: 6px; padding: 8px 10px; font: .84rem/1.35 var(--sans); color: var(--q-ink); cursor: pointer; }
.qa-pick button b { display: block; font-size: .7rem; letter-spacing: .12em; text-transform: uppercase; color: var(--q-oxblood); margin-bottom: 2px; }
.qa-pick button:hover { border-color: var(--q-ink-3); }
.qa-pick button[aria-pressed="true"] { border-color: var(--q-navy); box-shadow: inset 0 0 0 1px var(--q-navy); }
.qa-single .qa-cell { border-radius: 0 0 10px 10px; border-bottom: 1px solid var(--q-rule); padding-top: 24px; padding-bottom: 26px; }
.s-deep-intro { display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr); gap: 36px; align-items: end; }
@media (max-width: 1000px) {
  .qa-row { grid-template-columns: minmax(0, 1fr); }
  .qa-note { background: var(--q-paper); border-left: 1px solid var(--q-rule); border-right: 1px solid var(--q-rule); padding: 0 26px 18px; order: -1; }
  .qa-note > div { border-left: 3px solid var(--margin); padding: 8px 12px; background: var(--margin-soft); }
  .qa-row-first .qa-note { padding-top: 18px; }
  .qa-row-first .qa-cell { padding-top: 6px; }
  .qa-cell > .qa-n { display: none; }
  .s-deep-intro { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
  .qa-cell, .qa-note { padding-left: 14px; padding-right: 14px; }
  .qa-deep { padding-left: 14px; padding-right: 14px; }
  .qa-hl { font-size: 1.08rem; padding: 12px 14px; }
}
.qa-fake { color: var(--q-link); }
.qa-cell:has(> .qa-deep:not(.end)) { padding-bottom: 0; }
.qa-deep:not(.start) { padding-top: 8px; }
.qa-cell > .qa-n + .qa-deep:not(.start) { margin-top: 0; }
.qa-stack { display: grid; gap: 18px; }

/* Coupons */
.a-link { font: .78rem var(--mono); width: 100%; max-width: 30em; margin-top: 4px; padding: 3px 6px; border: 1px solid var(--rule); background: var(--sheet); color: var(--ink-2); border-radius: 3px; }
.a-coupons td { vertical-align: top; }
.a-coupons details summary { cursor: pointer; font-size: .86rem; color: var(--ink-2); }
.a-coupon-edit { display: grid; gap: 8px; margin: 10px 0; min-width: 260px; }
.a-coupon-edit label { display: grid; gap: 3px; font-size: .86rem; }
.a-coupon-edit label.a-check, .a-check { display: flex; align-items: center; gap: 6px; }
.a-coupon-edit input:not([type=checkbox]), .a-coupon-new input:not([type=checkbox]), .a-coupon-new select { font: inherit; padding: 6px 8px; border: 1px solid var(--rule); background: var(--sheet); color: var(--ink); border-radius: 3px; }
.a-who { margin: 4px 0 0; padding-left: 1.1em; font-size: .86rem; }
.s-coupon-form { margin-top: 26px; max-width: 420px; }
.s-coupon h1 { overflow-wrap: break-word; }

/* Home banner (Markdown, edited at /admin/home) */
.s-banner { margin: 8px 0 18px; padding: 16px 22px; background: var(--sheet); border: 1px solid var(--rule); border-left: 4px solid var(--margin); max-width: 860px; }
.s-banner > :first-child { margin-top: 0; }
.s-banner > :last-child { margin-bottom: 0; }
.s-banner h2, .s-banner h3, .s-banner h4 { margin: 0 0 6px; }
.s-banner h2 { font-size: 1.5rem; }
.s-banner p { margin: 0 0 10px; }
.s-banner ul, .s-banner ol { margin: 0 0 10px; padding-left: 1.2em; }
.s-banner code { font-size: .92em; }
.s-banner-cta { margin-top: 12px !important; }
.s-banner-calm { border-left-color: var(--ok); background: var(--ok-soft); }
.s-banner-dark { background: var(--navy); color: var(--navy-ink); border-color: var(--navy); }
.s-banner-dark a:not(.s-btn) { color: inherit; }
.s-banner-dark .s-btn { background: var(--navy-ink); color: var(--navy); }
.s-banner-plain { border: 0; background: none; padding: 0; }
.a-banner-cols { grid-template-columns: repeat(auto-fit, minmax(340px, 1fr)); }
.a-banner-form { display: grid; gap: 12px; }
.a-banner-form label { display: grid; gap: 4px; font-weight: 700; }
.a-banner-form label.a-check { display: flex; }
.a-banner-form textarea, .a-banner-form select, .a-banner-form input[type=date] { font: 400 .95rem/1.5 var(--mono); padding: 8px 10px; border: 1px solid var(--rule); background: var(--sheet); color: var(--ink); border-radius: 3px; }
.a-banner-form select, .a-banner-form input[type=date] { font-family: var(--sans); }
.a-banner-dates { display: flex; gap: 14px; flex-wrap: wrap; }
.a-banner-preview { border: 1px dashed var(--rule); padding: 14px; margin-bottom: 18px; }
.a-md-example { white-space: pre-wrap; font: .82rem/1.5 var(--mono); background: var(--sheet); border: 1px solid var(--rule); padding: 10px 12px; }
.a-md-help th { text-transform: none; letter-spacing: 0; font-family: var(--sans); }
.s-coupon-redeem { display: grid; gap: 12px; max-width: 360px; }
.s-coupon-redeem label, .s-coupon-form label { display: grid; gap: 4px; font-weight: 700; }
.s-coupon-redeem select { font: inherit; padding: 8px 10px; border: 1px solid var(--rule); background: var(--sheet); color: var(--ink); }

/* Footer: theme switch and payments */
.s-foot-bar { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px 24px; margin: 14px 0 6px; padding-top: 12px; border-top: 1px dotted var(--rule); }
.s-theme { display: inline-flex; align-items: center; gap: 4px; }
.s-theme[hidden] { display: none; }
.s-theme > span { margin-right: 6px; }
.s-theme button { font: 600 .82rem var(--sans); color: var(--ink-2); background: none; border: 1px solid var(--rule); padding: 4px 10px; border-radius: 20px; cursor: pointer; }
.s-theme button:hover { color: var(--ink); border-color: var(--ink-3); }
.s-theme button[aria-pressed="true"] { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.s-stripe { display: inline-flex; align-items: center; gap: 8px; color: var(--ink-3); text-decoration: none; }
.s-foot a.s-stripe { margin-right: 0; }
.s-stripe svg { height: 22px; width: auto; fill: #635BFF; display: block; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .s-stripe svg { fill: #A29DFF; } }
:root[data-theme="dark"] .s-stripe svg { fill: #A29DFF; }
.s-banner img { max-width: 100%; height: auto; }

/* Image banner: just the image, no box */
.s-banner-img { display: block; margin: 8px 0 22px; max-width: 860px; text-decoration: none; }
.s-banner-img img { display: block; width: 100%; height: auto; border: 0; border-radius: 6px; }
a.s-banner-img:focus-visible { outline-offset: 4px; }
.a-banner-form fieldset { border: 1px solid var(--rule); padding: 12px 14px; margin: 0; display: grid; gap: 10px; }
.a-banner-form fieldset[hidden] { display: none; }
.a-banner-form legend { font-weight: 700; padding: 0 6px; }
.a-banner-form input[type=file] { font: inherit; font-weight: 400; }
.a-banner-form label small { font-weight: 400; color: var(--ink-3); }
.a-banner-form input[name=image], .a-banner-form input[name=link], .a-banner-form input[name=alt] { font: 400 .95rem var(--sans); padding: 8px 10px; border: 1px solid var(--rule); background: var(--sheet); color: var(--ink); border-radius: 3px; }

/* Support: tickets and live chat */
.t-head h1 { margin-bottom: 6px; }
.t-head .s-kicker a { color: inherit; }
.t-state { color: var(--ink-3); font-size: .9rem; margin: 0 0 14px; }
.t-status { font-weight: 700; color: var(--ink); }
.t-status[data-state="open"] { color: var(--margin); }
.t-status[data-state="waiting"] { color: var(--ok); }
.t-online { display: inline-flex; align-items: center; gap: 6px; color: var(--ok); font-weight: 700; font-size: .9rem; margin-left: 8px; }
p.t-online { margin: 0 0 12px; }
.t-online[hidden] { display: none; }
.t-online i { width: 9px; height: 9px; border-radius: 50%; background: var(--ok); box-shadow: 0 0 0 3px var(--ok-soft); animation: t-pulse 2s ease-in-out infinite; }
@keyframes t-pulse { 50% { box-shadow: 0 0 0 6px transparent; } }
@media (prefers-reduced-motion: reduce) { .t-online i { animation: none; } }
.t-chat { display: flex; flex-direction: column; gap: 12px; max-height: 62vh; min-height: 220px; overflow-y: auto; padding: 18px; background: var(--sheet); border: 1px solid var(--rule); border-radius: 10px; max-width: 860px; overscroll-behavior: contain; }
.t-msg { max-width: 78%; padding: 10px 14px; border-radius: 12px; background: var(--paper); border: 1px solid var(--rule); align-self: flex-start; overflow-wrap: anywhere; }
.t-msg.t-mine { align-self: flex-end; background: var(--navy); color: var(--navy-ink); border-color: var(--navy); }
.t-msg.t-mine a { color: inherit; }
.t-msg.t-note { align-self: stretch; max-width: none; background: var(--margin-soft); color: var(--ink); border: 1px dashed var(--margin); }
.t-meta { font-size: .78rem; opacity: .8; margin-bottom: 4px; }
.t-note-tag { font: 700 .66rem var(--sans); letter-spacing: .1em; text-transform: uppercase; color: var(--margin); }
.t-body { line-height: 1.5; }
.t-files { list-style: none; margin: 8px 0 0; padding: 0; display: grid; gap: 6px; }
.t-files li a { font-weight: 700; }
.t-files small { font-weight: 400; opacity: .8; }
.t-img img { display: block; max-width: 260px; max-height: 220px; border-radius: 6px; border: 1px solid var(--rule); margin-bottom: 2px; }
.t-img span { font-size: .8rem; }
.t-compose { max-width: 860px; margin: 14px 0 10px; display: grid; gap: 8px; }
.t-label { font-weight: 700; font-size: .9rem; }
.t-compose textarea { width: 100%; font: inherit; padding: 10px 12px; border: 1.5px solid var(--rule); border-radius: 6px; background: var(--sheet); color: var(--ink); resize: vertical; }
.t-compose-row { display: flex; flex-wrap: wrap; gap: 10px 16px; align-items: center; }
.t-compose-row select { font: inherit; padding: 6px 8px; border: 1px solid var(--rule); background: var(--sheet); color: var(--ink); border-radius: 4px; }
.t-compose-row .s-btn { margin-left: auto; }
.t-attach { font-size: .88rem; font-weight: 700; display: inline-flex; gap: 8px; align-items: center; }
.t-attach input { font-weight: 400; max-width: 240px; }
.t-check { display: inline-flex; gap: 6px; align-items: center; font-size: .88rem; }
.t-files-help { margin: 0; }
.t-close { margin: 4px 0 20px; }
.t-list { list-style: none; margin: 0 0 14px; padding: 0; }
.t-row a { display: block; padding: 9px 0; border-bottom: 1px dotted var(--rule); text-decoration: none; }
.t-row small { display: block; color: var(--ink-3); }
.t-unread b { color: var(--margin); }
.t-new { font: 700 .68rem var(--sans); letter-spacing: .08em; text-transform: uppercase; background: var(--margin); color: #fff; padding: 1px 6px; border-radius: 10px; }
.t-new-form label { display: grid; gap: 4px; }
/* Admin */
.a-count { display: inline-block; min-width: 18px; padding: 0 6px; border-radius: 10px; background: var(--margin); color: #fff; font: 700 .72rem/18px var(--sans); text-align: center; vertical-align: 2px; }
.a-subtabs { display: flex; flex-wrap: wrap; gap: 6px 18px; }
.a-tickets tr.a-unread td { font-weight: 700; }
.a-ticket { display: grid; grid-template-columns: minmax(0, 1fr) 280px; gap: 32px; align-items: start; }
.a-ticket-status { display: grid; gap: 4px; margin: 10px 0; }
.a-log { list-style: none; padding: 0; margin: 0; font: .78rem/1.5 var(--mono); max-height: 70vh; overflow: auto; border: 1px solid var(--rule); background: var(--sheet); }
.a-log li { padding: 4px 10px; border-bottom: 1px solid var(--rule); white-space: pre-wrap; overflow-wrap: anywhere; }
.a-log li.a-log-err { color: var(--margin); background: var(--margin-soft); }
.a-log li.a-log-warn { color: var(--pencil); }
@media (max-width: 900px) { .a-ticket { grid-template-columns: 1fr; } .t-msg { max-width: 92%; } }

/* Friends */
.f-list { list-style: none; margin: 0 0 22px; padding: 0; max-width: 620px; }
.f-list li { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 8px 14px; padding: 10px 0; border-bottom: 1px dotted var(--rule); }
.f-list li small { display: block; color: var(--ink-3); }
.f-friends li { padding: 0; }
.f-open { display: block; width: 100%; padding: 10px 0; text-decoration: none; }
.f-open:hover b { color: var(--margin); }
.f-btns { display: flex; flex-wrap: wrap; gap: 6px; }
.f-act { display: inline; margin: 0; }
.f-menu { display: flex; flex-wrap: wrap; gap: 8px; margin: 6px 0 16px; }
.f-add { margin-top: 16px; }
.f-add label { display: grid; gap: 4px; }
.f-blocked summary { cursor: pointer; color: var(--ink-3); margin: 6px 0; }
.t-share { display: block; margin-top: 8px; padding: 10px 12px; border-radius: 8px; border: 1px solid var(--rule); background: var(--sheet); color: var(--ink); text-decoration: none; }
.t-mine .t-share { color: var(--ink); }
.t-share span { display: block; font: 700 .68rem var(--sans); letter-spacing: .1em; text-transform: uppercase; color: var(--margin); }
.t-share b { display: block; font-family: var(--serif); font-size: 1.05rem; }
.t-share small { color: var(--ink-3); }
.t-share-gone { font-size: .85rem; opacity: .8; }
.t-report { background: none; border: 0; padding: 0 0 0 6px; font: inherit; font-size: .74rem; color: inherit; opacity: .7; text-decoration: underline; cursor: pointer; }
.t-report:hover { opacity: 1; }
.t-empty { margin: auto; }

/* Back to the notebook the visitor came from */
.s-backbar { background: var(--navy); color: var(--navy-ink); }
.s-backbar a { display: block; max-width: 1180px; margin: 0 auto; padding: 9px 24px; color: inherit; font-weight: 700; font-size: .92rem; text-decoration: none; }
.s-backbar a:hover { text-decoration: underline; color: inherit; }
.a-usage td.a-bar-cell { width: 45%; }
.a-bar { display: block; height: 10px; border-radius: 3px; background: var(--margin); opacity: .75; }
.a-usage tr.a-low td { background: var(--margin-soft); }
.a-tabs { flex-wrap: wrap; gap: 4px 18px; }
.a-tabs a { white-space: nowrap; }

/* Course book store */
.s-store-subject { margin: 28px 0; }
.s-books { display: grid; grid-template-columns: repeat(auto-fill, minmax(270px, 1fr)); gap: 18px; align-items: stretch; }
.s-book { background: var(--sheet); border: 1px solid var(--rule); padding: 20px 20px 16px; display: flex; flex-direction: column; gap: 6px; }
.s-book.on-sale { border-top: 4px solid var(--margin); }
.s-book h3 { margin: 0; font-size: 1.2rem; }
.s-book-desc { margin: 4px 0; color: var(--ink-2); font-size: .95rem; }
.s-bookprice { margin: 6px 0 4px; display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; }
.s-bookprice b { font: 600 2rem var(--serif); }
.s-bookprice s { color: var(--ink-3); font-size: 1.1rem; }
.s-sale-tag { background: var(--margin); color: #fff; font: 700 .72rem var(--sans, inherit); letter-spacing: .08em; text-transform: uppercase; padding: 3px 8px; border-radius: 2px; }
.s-buyform { display: flex; flex-direction: column; gap: 10px; margin-top: auto; }
.s-check { display: flex; gap: 8px; align-items: flex-start; font-size: .86rem; color: var(--ink-2); }
.s-check input { margin-top: 3px; flex: none; }
.s-library { list-style: none; margin: 0 0 12px; padding: 0; display: grid; gap: 10px; }
.s-library li { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; background: var(--sheet); border: 1px solid var(--rule); padding: 12px 14px; }
.s-library small { display: block; color: var(--ink-3); }
.a-store-form { display: grid; gap: 10px; max-width: 760px; margin: 8px 0 14px; }
.a-store-form label { display: grid; gap: 4px; font-weight: 600; font-size: .9rem; }
.a-store-form input:not([type=checkbox]):not([type=file]), .a-store-form select, .a-store-form textarea { font: inherit; padding: 6px 8px; border: 1px solid var(--rule); background: var(--sheet); color: var(--ink); border-radius: 3px; font-weight: 400; }
.a-store-form .a-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 12px; }
.a-pdf { border: 1px solid var(--rule); padding: 10px 12px; display: grid; gap: 8px; }
.a-warn { color: var(--danger, #a4262c); }
.s-book { padding: 0; }
.s-book-link { display: flex; flex-direction: column; gap: 8px; padding: 14px 14px 16px; color: inherit; text-decoration: none; height: 100%; }
.s-book-link:hover h3 { text-decoration: underline; }
.s-book-link:hover .s-cover { box-shadow: 4px 6px 0 var(--margin-soft, rgba(0,0,0,.12)); }
.s-cover { position: relative; aspect-ratio: 3 / 4; background: var(--sheet-2, #eee); border: 1px solid var(--rule); overflow: hidden; display: flex; align-items: center; justify-content: center; transition: box-shadow .15s; }
.s-cover img { width: 100%; height: 100%; object-fit: cover; display: block; }
.s-cover-blank { padding: 18px; text-align: center; font: 600 1.15rem var(--serif); color: var(--ink-2); }
.s-sale-corner { position: absolute; top: 10px; left: 10px; }
.s-owned { font-size: .82rem; font-weight: 700; color: var(--ok, #2c6e49); }
.s-books { grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); }
.s-book h3 { font-size: 1.05rem; line-height: 1.25; }
.s-book .s-bookprice b { font-size: 1.5rem; }
.s-crumb { font-size: .9rem; color: var(--ink-3); margin: 0 0 14px; }
.s-bookpage { display: grid; grid-template-columns: minmax(200px, 300px) minmax(0, 1fr); gap: 36px; align-items: start; }
.s-bookpage-cover { position: sticky; top: 16px; }
.s-bookpage-cover .s-cover { box-shadow: 6px 8px 0 var(--margin-soft, rgba(0,0,0,.12)); }
.s-bookpage-main h1 { margin: 0 0 6px; }
.s-bookprice-big b { font-size: 2.6rem; }
.s-bookpage-buy { margin: 12px 0 24px; max-width: 420px; }
.s-book-about { max-width: 70ch; margin: 8px 0 18px; }
@media (max-width: 720px) { .s-bookpage { grid-template-columns: 1fr; gap: 20px; } .s-bookpage-cover { position: static; max-width: 240px; } }
.a-cover { display: grid; gap: 4px; justify-items: start; width: 70px; }
.a-cover img { border: 1px solid var(--rule); object-fit: cover; }
.a-cover-line { display: flex; gap: 14px; align-items: flex-start; flex-wrap: wrap; }
.a-cover-line img { border: 1px solid var(--rule); object-fit: cover; }
.s-book-course { margin: 2px 0 0; font: 700 .7rem var(--sans, inherit); letter-spacing: .12em; text-transform: uppercase; color: var(--margin); }
.s-books { margin-top: 8px; }

/* Learn section: teaching pages per subject */
.s-learn-points { margin: 14px 0 22px; padding-left: 1.2em; max-width: 62ch; color: var(--ink-2); }
.s-learn-points li { margin-bottom: 8px; }
.s-learn-points li b { color: var(--ink); }
.s-learn-grid { list-style: none; margin: 0 0 18px; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 12px; }
.s-learn-card a { display: grid; grid-template-columns: auto 1fr; gap: 2px 12px; align-items: center; padding: 12px 14px; background: var(--sheet); border: 1px solid var(--rule); border-left: 4px solid var(--acc); text-decoration: none; color: var(--ink); }
.s-learn-card a:hover { border-color: var(--acc); }
.s-learn-card .s-glyph { grid-row: 1 / span 2; }
.s-learn-name { font-weight: 600; line-height: 1.2; }
.s-learn-name small { display: block; font-weight: 400; font-size: .8rem; color: var(--ink-2); }
.s-learn-n { font-size: .85rem; color: var(--ink-2); }
.s-learn-n b { color: var(--ink); font-size: 1.05rem; }
.s-learn-topics { columns: 2 260px; column-gap: 28px; margin: 10px 0 6px; padding-left: 1.1em; font-size: .93rem; color: var(--ink-2); }
.s-learn-topics li { break-inside: avoid; margin-bottom: 4px; }

/* Change password on the account page */
.s-pw { margin: 14px 0; }
.s-pw > summary { cursor: pointer; font-weight: 700; padding: 4px 0; }
.s-pw .s-form { margin-top: 10px; }