/* Shawn Niu - personal site theme.
   One stylesheet for the Ghost theme AND the workspace service (services/workspace serves this
   same file at /_ws/assets/css/screen.css), so public and private pages look like one site.

   Palette (contrast on --bg, WCAG 2.2): --text 13.2:1, --muted 5.3:1, --accent 6.1:1,
   white on --accent 6.7:1. --rule is decorative only (separators), never a control border.
   No web fonts: system serif for the name and headings, system sans for everything else. */

:root {
  --bg: #F6F4EE;
  --surface: #FBFAF6;
  --surface-strong: #EEEBE1;
  --text: #252B25;
  --muted: #62675E;
  --accent: #526044;
  --accent-strong: #3F4B33;
  --rule: #D8DBCF;
  --control: #7D8275;
  --danger: #8A2E1F;
  --ok: #3B5B2C;
  --focus: #2F5D8A;

  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", "URW Palladio L", Georgia, "Songti SC", serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;

  --shell: 1160px;
  --measure: 720px;
  --gutter: 16px;
  --radius: 6px;
  --accent-ghost: var(--accent);
}

@media (min-width: 768px) {
  :root { --gutter: 32px; }
}

*, *::before, *::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 400 1rem/1.6 var(--gh-font-body, var(--sans));
  overflow-wrap: break-word;
}

img, svg, video { max-width: 100%; height: auto; }

a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 0.18em; }
a:hover { color: var(--accent-strong); text-decoration-thickness: 2px; }

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
  border-radius: 2px;
}

h1, h2, h3, h4 { line-height: 1.25; margin: 0 0 0.5em; font-weight: 600; }
h1, h2 { font-family: var(--gh-font-heading, var(--serif)); letter-spacing: -0.01em; }
h1 { font-size: clamp(2rem, 4.5vw, 2.75rem); }
h2 { font-size: clamp(1.4rem, 2.6vw, 1.75rem); }
h3 { font-size: 1.15rem; }
p { margin: 0 0 1em; }

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap; border: 0;
}

.skip-link {
  position: absolute; left: 8px; top: -60px; z-index: 100;
  padding: 10px 14px; background: var(--text); color: #fff;
  border-radius: var(--radius); text-decoration: none;
}
.skip-link:focus { top: 8px; color: #fff; }

.shell {
  width: 100%;
  max-width: calc(var(--shell) + 2 * var(--gutter));
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.measure { max-width: var(--measure); }

.icon-lock { display: inline-block; width: 0.75em; height: 0.75em; vertical-align: -0.02em; }

/* ------------------------------------------------------------------ header */

.site-header { border-bottom: 1px solid var(--rule); background: var(--bg); }
.site-header-inner {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  gap: 8px 24px; min-height: 64px; padding-block: 10px;
}
.site-brand {
  font-family: var(--serif); font-size: 1.35rem; font-weight: 600;
  color: var(--text); text-decoration: none; letter-spacing: -0.01em;
  padding-block: 6px;
}
.site-brand:hover { color: var(--accent-strong); }

.site-nav ul { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 2px 4px; }
.site-nav a {
  display: inline-flex; align-items: center; gap: 0.35em;
  min-height: 44px; padding: 0 10px;
  color: var(--text); text-decoration: none; font-size: 0.95rem; border-radius: var(--radius);
}
.site-nav a:hover { background: var(--surface-strong); color: var(--text); }
.site-nav a[aria-current="page"] { color: var(--accent-strong); text-decoration: underline; text-decoration-thickness: 2px; text-underline-offset: 0.35em; }
.site-nav .icon-lock { color: var(--muted); }

.nav-toggle {
  min-height: 44px; padding: 0 14px;
  font: inherit; color: var(--text); background: transparent;
  border: 1px solid var(--control); border-radius: var(--radius); cursor: pointer;
}

/* Without JavaScript the nav simply wraps under the name. With it (site.js), narrow screens
   get a disclosure button; the nav is hidden only while the button says it is collapsed. */
@media (max-width: 719px) {
  .js .nav-toggle { display: inline-flex; align-items: center; }
  .js .nav-toggle[hidden] { display: inline-flex; }
  .js .site-nav { flex-basis: 100%; }
  .js .site-nav[data-collapsed="true"] { display: none; }
  .js .site-nav ul { flex-direction: column; padding-bottom: 8px; }
  .js .site-nav a { width: 100%; }
}
@media (min-width: 720px) {
  .nav-toggle { display: none !important; }
}

.workspace-bar { background: var(--surface-strong); border-bottom: 1px solid var(--rule); font-size: 0.9rem; }
.workspace-bar-inner { display: flex; align-items: center; justify-content: space-between; gap: 12px; min-height: 44px; }
.workspace-bar-label { margin: 0; color: var(--muted); }
.workspace-signout { margin: 0; }

/* ------------------------------------------------------------------ main + footer */

.site-main { display: block; padding-block: 40px 72px; }
.site-main:focus { outline: none; }
@media (min-width: 768px) { .site-main { padding-block: 64px 96px; } }

.site-footer { border-top: 1px solid var(--rule); padding-block: 32px 40px; color: var(--muted); font-size: 0.95rem; }
.site-footer-inner { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 16px 32px; }
.site-footer p { margin: 0; }
.footer-name { color: var(--text); }
.footer-links { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 0 4px; }
.footer-links a { display: inline-flex; align-items: center; min-height: 44px; padding: 0 8px; color: var(--muted); }
.footer-links a:hover { color: var(--accent-strong); }

/* ------------------------------------------------------------------ shared pieces */

.eyebrow {
  display: inline-flex; align-items: center; gap: 0.4em;
  margin: 0 0 12px; color: var(--muted);
  font-size: 0.8rem; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase;
}
.eyebrow a { color: inherit; }
.lede { font-size: 1.125rem; color: var(--muted); max-width: var(--measure); }
.page-head { margin-bottom: 40px; max-width: var(--measure); }
.page-head h1 { margin-bottom: 12px; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 20px; }

.section { margin-top: 56px; }
.section:first-child { margin-top: 0; }
.section-head { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 8px 16px; margin-bottom: 16px; border-bottom: 1px solid var(--rule); padding-bottom: 10px; }
.section-title { font-size: 1.35rem; margin: 0; }
.section-head .section-title { margin: 0; }
.section > .section-title { border-bottom: 1px solid var(--rule); padding-bottom: 10px; margin-bottom: 16px; }
.section-link { font-size: 0.95rem; }

.button {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.4em;
  min-height: 44px; padding: 0 18px;
  font: 600 0.95rem/1.2 var(--sans); text-decoration: none;
  color: var(--accent-strong); background: transparent;
  border: 1px solid var(--accent); border-radius: var(--radius); cursor: pointer;
}
.button:hover { background: var(--surface-strong); color: var(--accent-strong); }
.button-primary { color: #fff; background: var(--accent); border-color: var(--accent); }
.button-primary:hover { color: #fff; background: var(--accent-strong); border-color: var(--accent-strong); }
.button[disabled], .button[aria-disabled="true"] { opacity: 0.6; cursor: progress; }
.link-button {
  min-height: 44px; padding: 0 4px; font: inherit; color: var(--accent); background: none; border: 0;
  text-decoration: underline; text-underline-offset: 0.18em; cursor: pointer;
}
.link-button:hover { color: var(--accent-strong); }

.empty-state { color: var(--muted); }

.lock-label { display: inline-flex; align-items: center; gap: 0.35em; font-size: 0.85rem; font-weight: 600; color: var(--muted); }

.lang-flag { font-size: 0.85rem; color: var(--muted); }

/* ------------------------------------------------------------------ forms */

.field { margin-bottom: 16px; }
.field-label { display: block; margin-bottom: 6px; font-weight: 600; font-size: 0.95rem; }
.field-help { margin: -2px 0 8px; color: var(--muted); font-size: 0.9rem; }
.field-input {
  width: 100%; min-height: 48px; padding: 10px 12px;
  font: inherit; font-size: 1rem; color: var(--text); background: #fff;
  border: 1px solid var(--control); border-radius: var(--radius);
}
.field-input:focus-visible { outline: 3px solid var(--focus); outline-offset: 1px; }
.field-inline { display: flex; flex-wrap: wrap; gap: 10px; align-items: flex-end; }
.field-inline .field { flex: 1 1 240px; margin-bottom: 0; }
.field-error { color: var(--danger); font-size: 0.9rem; margin: 4px 0; }
.form-message { margin: 14px 0 0; padding: 10px 14px; border-radius: var(--radius); border-left: 4px solid; background: var(--surface); }
.form-message-ok { border-color: var(--ok); color: var(--ok); }
.form-message-err { border-color: var(--danger); color: var(--danger); }
.form-message-info { border-color: var(--accent); color: var(--text); }
.form-note { margin: 12px 0 0; font-size: 0.9rem; color: var(--muted); }

.choice { display: flex; gap: 10px; align-items: flex-start; margin: 8px 0; }
.choice input { width: 22px; height: 22px; margin: 2px 0 0; accent-color: var(--accent); flex: none; }
.choice label { cursor: pointer; }
.choice-name { display: block; font-weight: 600; }
.choice-note { display: block; color: var(--muted); font-size: 0.92rem; }
fieldset.field { border: 0; padding: 0; margin: 0 0 16px; min-width: 0; }
fieldset.field legend { padding: 0; }

.honeypot { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }

/* ------------------------------------------------------------------ home */

.hero { padding-block: 8px 24px; max-width: 820px; }
.hero-name { margin: 0 0 18px; font-size: clamp(2.4rem, 7vw, 4rem); line-height: 1.08; letter-spacing: -0.02em; }
.hero-name span { display: block; }
.hero-name .hero-sub { color: var(--muted); font-weight: 400; }
.hero-lede { font-size: clamp(1.1rem, 2vw, 1.25rem); color: var(--text); max-width: 640px; }

.home-grid { display: grid; gap: 56px; margin-top: 56px; }
@media (min-width: 960px) {
  .home-grid { grid-template-columns: minmax(0, 1fr) 340px; gap: 64px; align-items: start; }
}

.featured { display: grid; gap: 14px; }
.featured .post-item {
  padding: 22px 24px; background: var(--surface); border: 1px solid var(--rule); border-radius: 10px;
}
.featured .post-item:first-child { padding-top: 22px; }
.featured .post-item-title { font-size: 1.5rem; }

.post-list { list-style: none; margin: 0; padding: 0; }
.post-item { padding: 18px 0; border-bottom: 1px solid var(--rule); }
.post-item:first-child { padding-top: 4px; }
.post-item-title { font-family: var(--serif); font-size: 1.25rem; margin: 0 0 6px; }
.post-item-title a { color: var(--text); text-decoration: none; }
.post-item-title a:hover { color: var(--accent-strong); text-decoration: underline; }
.post-item-summary { margin: 0 0 8px; color: var(--muted); }
.post-item-meta { margin: 0; font-size: 0.9rem; color: var(--muted); display: flex; flex-wrap: wrap; gap: 0 8px; }

.side-stack { display: grid; gap: 24px; }
.panel { padding: 24px; background: var(--surface); border: 1px solid var(--rule); border-radius: 10px; }
.panel h2 { font-size: 1.3rem; }
.panel p:last-child { margin-bottom: 0; }

.private-entries { display: grid; gap: 16px; margin-top: 16px; }
@media (min-width: 640px) { .private-entries { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
.private-card { display: flex; flex-direction: column; gap: 8px; padding: 20px; background: var(--surface); border: 1px solid var(--rule); border-radius: 10px; }
.private-card h3 { margin: 0; font-family: var(--serif); font-size: 1.25rem; }
.private-card p { margin: 0; color: var(--muted); }
.private-card .button { align-self: flex-start; margin-top: 6px; }

.about-blurb { max-width: var(--measure); }

/* ------------------------------------------------------------------ article */

.article-head { max-width: var(--measure); margin: 0 auto 32px; }
.article-title { font-size: clamp(2rem, 5vw, 2.9rem); line-height: 1.15; margin-bottom: 16px; }
.article-excerpt { font-size: 1.2rem; color: var(--muted); }
.article-meta { display: flex; flex-wrap: wrap; gap: 4px 12px; font-size: 0.92rem; color: var(--muted); margin: 0; }
.article-kicker { margin-bottom: 14px; }

.article-feature { max-width: 960px; margin: 0 auto 40px; }
.article-feature img { display: block; width: 100%; border-radius: 8px; }
.article-feature figcaption { margin-top: 8px; font-size: 0.9rem; color: var(--muted); text-align: center; }

.toc { max-width: var(--measure); margin: 0 0 32px; padding: 16px 20px; background: var(--surface); border: 1px solid var(--rule); border-radius: 8px; font-size: 0.95rem; }
.article .toc { margin-inline: auto; }
.toc-title { margin: 0 0 6px; font-weight: 600; }
.toc ul { list-style: none; margin: 0; padding: 0; }
.toc li { margin: 4px 0; }
.toc .toc-sub { padding-left: 1.1em; }

.gh-content, .prose {
  max-width: var(--measure); margin: 0 auto;
  font-size: 1.0625rem; line-height: 1.75;
}
@media (min-width: 768px) { .gh-content, .prose { font-size: 1.125rem; } }
.gh-content > * + *, .prose > * + * { margin-top: 1.1em; }
.gh-content-flush { margin-inline: 0; }
.gh-content p, .gh-content ul, .gh-content ol { margin-bottom: 0; }
.gh-content h2 { margin-top: 2em; font-size: 1.6rem; }
.gh-content h3 { margin-top: 1.6em; font-size: 1.25rem; }
.gh-content h4 { margin-top: 1.4em; font-size: 1.05rem; }
.gh-content :is(h2, h3, h4) { position: relative; scroll-margin-top: 16px; }
.heading-anchor { margin-left: 0.35em; font-size: 0.8em; color: var(--muted); text-decoration: none; opacity: 0.7; }
.heading-anchor:hover, .heading-anchor:focus-visible { opacity: 1; color: var(--accent); }
.gh-content blockquote { margin-inline: 0; padding: 4px 0 4px 20px; border-left: 3px solid var(--accent); color: var(--muted); font-style: italic; }
.gh-content :not(pre) > code { font-family: var(--mono); font-size: 0.88em; background: var(--surface-strong); padding: 0.1em 0.35em; border-radius: 4px; }
.gh-content pre { font-family: var(--mono); font-size: 0.88rem; line-height: 1.55; background: #20251F; color: #F1F0EA; padding: 16px; border-radius: 8px; overflow-x: auto; }
.gh-content img { border-radius: 6px; }
.gh-content figure { margin-inline: 0; }
.gh-content figcaption { font-size: 0.9rem; color: var(--muted); text-align: center; margin-top: 8px; }
.gh-content hr { border: 0; border-top: 1px solid var(--rule); margin-block: 2.5em; }
.gh-content table { display: block; max-width: 100%; overflow-x: auto; border-collapse: collapse; font-size: 0.95rem; }
.gh-content th, .gh-content td { border: 1px solid var(--rule); padding: 8px 10px; text-align: left; vertical-align: top; }
.gh-content th { background: var(--surface-strong); }

/* Ghost editor cards (gscan requires the width classes). */
.kg-width-wide { position: relative; width: min(85vw, 1040px); left: 50%; transform: translateX(-50%); }
.kg-width-full { position: relative; width: 100vw; left: 50%; transform: translateX(-50%); }
.kg-width-full img { border-radius: 0; }
.kg-image-card img, .kg-gallery-image img { display: block; margin-inline: auto; }
.kg-gallery-container { display: flex; flex-direction: column; gap: 8px; }
.kg-gallery-row { display: flex; gap: 8px; }
.kg-gallery-image { flex: 1 1 0; }
.kg-gallery-image img { width: 100%; height: 100%; object-fit: cover; }
.kg-bookmark-card a { display: flex; border: 1px solid var(--rule); border-radius: 8px; text-decoration: none; color: var(--text); overflow: hidden; background: var(--surface); }
.kg-bookmark-content { padding: 16px; }
.kg-bookmark-title { font-weight: 600; }
.kg-bookmark-description, .kg-bookmark-metadata { color: var(--muted); font-size: 0.9rem; }
.kg-bookmark-thumbnail { flex: 0 0 30%; }
.kg-bookmark-thumbnail img { width: 100%; height: 100%; object-fit: cover; }
.kg-bookmark-icon { width: 18px; height: 18px; vertical-align: middle; }
.kg-callout-card { display: flex; gap: 12px; padding: 16px 20px; background: var(--surface-strong); border-radius: 8px; }
.kg-embed-card { display: flex; flex-direction: column; align-items: center; }

.article-foot { max-width: var(--measure); margin: 56px auto 0; padding-top: 24px; border-top: 1px solid var(--rule); }
.tag-list { list-style: none; margin: 0 0 24px; padding: 0; display: flex; flex-wrap: wrap; gap: 8px; }
.tag { display: inline-flex; align-items: center; min-height: 32px; padding: 0 12px; border: 1px solid var(--rule); border-radius: 999px; font-size: 0.88rem; text-decoration: none; color: var(--text); background: var(--surface); }
.tag:hover { border-color: var(--accent); color: var(--accent-strong); }
.post-nav ul { list-style: none; margin: 24px 0 0; padding: 0; display: grid; gap: 12px; }
.post-nav-label { display: block; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); }
.source-line { font-size: 0.92rem; color: var(--muted); }

.pagination { margin-top: 32px; display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px; }
.pagination-status { margin: 0; color: var(--muted); font-size: 0.92rem; }
.pagination-links { list-style: none; display: flex; gap: 12px; margin: 0; padding: 0; }
.pagination-links a, .pagination-disabled { display: inline-flex; align-items: center; min-height: 44px; padding: 0 12px; }
.pagination-disabled { color: var(--muted); opacity: 0.7; }

/* ------------------------------------------------------------------ newsletter, subscribe */

.subscribe-block h2 { margin-bottom: 8px; }
.subscribe-block .subscribe-intro { color: var(--muted); }
.subscribe-form { margin-top: 12px; }
.subscribe-explainer { max-width: var(--measure); }
.subscribe-explainer h2 { font-size: 1.25rem; margin-top: 2em; }

/* ------------------------------------------------------------------ workspace (private) */

.login-panel { max-width: 520px; margin: 0 auto; }
.login-panel h1 { font-size: clamp(1.8rem, 4vw, 2.3rem); }
.login-form { margin-top: 24px; }
.login-aside { margin-top: 28px; font-size: 0.9rem; color: var(--muted); }

.entry-list { list-style: none; margin: 0; padding: 0; }
.entry { padding: 16px 0; border-bottom: 1px solid var(--rule); }
.entry-title { font-family: var(--serif); font-size: 1.2rem; margin: 0 0 4px; }
.entry-title a { color: var(--text); text-decoration: none; }
.entry-title a:hover { color: var(--accent-strong); text-decoration: underline; }
.entry-summary { margin: 0 0 6px; color: var(--muted); }
.entry-meta { margin: 0; font-size: 0.9rem; color: var(--muted); }

.map-section .map-block { margin-bottom: 28px; }
.map-block h3 { font-family: var(--serif); font-size: 1.2rem; }
.map-note { color: var(--muted); font-size: 0.95rem; }
.question-list { margin: 0; padding-left: 1.3em; max-width: var(--measure); }
.question-list li { margin: 8px 0; }
.topic-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 16px; }
@media (min-width: 720px) { .topic-list { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
.topic { padding: 18px 20px; background: var(--surface); border: 1px solid var(--rule); border-radius: 10px; }
.topic-title { margin: 0 0 6px; font-family: var(--gh-font-heading, var(--serif)); font-size: 1.15rem; }
.topic p { margin: 0 0 6px; }
.source-note { color: var(--muted); font-size: 0.88rem; }
.inline-link { font-size: 0.9rem; }

.breadcrumbs ol { list-style: none; display: flex; flex-wrap: wrap; gap: 4px; margin: 0 0 8px; padding: 0; font-size: 0.92rem; color: var(--muted); }
.breadcrumbs li + li::before { content: "/"; margin-right: 4px; color: var(--rule); }
.item-meta { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px 24px; margin-bottom: 16px; }
.related-links { list-style: none; display: flex; flex-wrap: wrap; gap: 6px 16px; margin: 0; padding: 0; font-size: 0.92rem; }
.workspace-item { margin-top: 8px; }
.workspace-item-page .site-main { padding-top: 24px; }

.error-page { max-width: var(--measure); }

.search-form { display: grid; gap: 0 16px; max-width: var(--measure); }
@media (min-width: 720px) { .search-form { grid-template-columns: 2fr 1fr; align-items: end; } }
.search-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 16px; }
@media (min-width: 720px) { .search-actions { grid-column: 1 / -1; } }
.result-count { color: var(--muted); }

/* ------------------------------------------------------------------ motion, print */

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; transition: none !important; animation: none !important; }
}
@media print {
  .site-header, .site-footer, .workspace-bar, .subscribe-block, .toc, .nav-toggle { display: none !important; }
  body { background: #fff; }
}