@font-face {
  font-family: "DM Sans";
  font-style: normal;
  font-weight: 400 700;
  font-display: swap;
  src: url("../fonts/dm-sans-latin.woff2") format("woff2");
}

:root {
  --md-sys-color-primary: #386a20;
  --md-sys-color-on-primary: #ffffff;
  --md-sys-color-primary-container: #d3edbc;
  --md-sys-color-on-primary-container: #102004;
  --md-sys-color-surface: #f8faf1;
  --md-sys-color-surface-container: #edf1e5;
  --md-sys-color-surface-container-low: #f1f4ea;
  --md-sys-color-on-surface: #1a2118;
  --md-sys-color-on-surface-variant: #535b4d;
  --md-sys-color-outline: #747d6b;
  --md-sys-color-outline-variant: #d7ddcd;
  --md-sys-color-tertiary-container: #f8dec4;
  --md-sys-shape-corner-extra-large: 28px;
  color-scheme: light;
  font-family: "DM Sans", "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  color: var(--md-sys-color-on-surface);
  background: var(--md-sys-color-surface);
  font-synthesis: none;
  -webkit-font-smoothing: antialiased;
}

* { box-sizing: border-box; }
body { margin: 0; min-width: 280px; }
button, a { -webkit-tap-highlight-color: transparent; }
button { font: inherit; cursor: pointer; }
a { color: inherit; text-decoration: none; }
button, input { color: inherit; }
img { display: block; max-width: 100%; }
[hidden] { display: none !important; }
::selection { background: var(--md-sys-color-primary-container); }
:focus-visible { outline: 3px solid var(--md-sys-color-primary); outline-offset: 5px; }
.icon { display: block; width: 24px; height: 24px; flex-shrink: 0; }
.site-width { width: 50%; margin-inline: auto; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }
.skip-link { position: fixed; top: 12px; left: 12px; z-index: 10; padding: 12px 20px; background: var(--md-sys-color-primary); color: white; border-radius: 24px; transform: translateY(-150%); }
.skip-link:focus { transform: translateY(0); }

.site-header { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 24px; border-bottom: 1px solid var(--md-sys-color-outline-variant); }
.brand { display: inline-flex; align-items: center; gap: 10px; flex-shrink: 0; font-size: 22px; font-weight: 700; letter-spacing: 1px; }
.brand-mark { display: grid; place-items: center; width: 42px; height: 42px; border-radius: 15px; background: var(--md-sys-color-primary-container); color: var(--md-sys-color-primary); }
.brand-mark .icon { width: 27px; height: 27px; }
.site-nav { display: flex; align-items: center; gap: 6px; }
.site-nav a { display: inline-flex; align-items: center; justify-content: center; min-height: 42px; padding: 9px 17px; border-radius: 24px; font-size: 14px; font-weight: 500; color: var(--md-sys-color-on-surface-variant); transition: background 180ms ease; white-space: nowrap; }
.site-nav a:hover { background: var(--md-sys-color-surface-container); }
.site-nav a[aria-current="page"] { background: var(--md-sys-color-primary-container); color: var(--md-sys-color-on-primary-container); }
.site-main { min-height: calc(100svh - 210px); }
.eyebrow { display: flex; align-items: center; gap: 9px; margin: 0 0 16px; font-size: 12px; line-height: 1.7; font-weight: 500; letter-spacing: 1.5px; color: var(--md-sys-color-primary); }
h1, h2, p { overflow-wrap: anywhere; }

.carousel { margin-top: 40px; }
.carousel-viewport { border-radius: var(--md-sys-shape-corner-extra-large); }
.carousel-track { display: grid; gap: 24px; }
.feature-card { display: grid; min-width: 0; overflow: hidden; border-radius: var(--md-sys-shape-corner-extra-large); background: var(--md-sys-color-on-surface); }
.feature-image-wrap { position: relative; display: grid; align-items: end; isolation: isolate; width: 100%; min-width: 0; aspect-ratio: 2; min-height: 336px; overflow: hidden; color: #ffffff; background: var(--md-sys-color-on-surface); }
.feature-image-wrap::after { content: ""; position: absolute; inset: 0; z-index: 1; background: linear-gradient(180deg, rgb(10 20 9 / 8%) 0%, rgb(10 20 9 / 42%) 30%, rgb(10 20 9 / 82%) 60%, rgb(10 20 9 / 94%) 100%); pointer-events: none; }
.feature-image { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.feature-category { position: absolute; top: 22px; left: 22px; z-index: 3; display: inline-flex; align-items: center; gap: 8px; min-height: 34px; padding: 7px 13px; border-radius: 20px; background: var(--md-sys-color-surface); color: var(--md-sys-color-on-surface); font-size: 12px; font-weight: 500; letter-spacing: 1px; }
.category-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--md-sys-color-primary); }
.feature-content { position: relative; z-index: 2; margin-top: 88px; padding: 32px; }
.feature-copy h1, .feature-copy h2 { margin: 0 0 12px; font-size: clamp(23px, 1.8vw, 30px); font-weight: 600; line-height: 1.45; letter-spacing: -.6px; }
.feature-copy p { max-width: 43em; margin: 0; color: rgb(255 255 255 / 90%); font-size: 14px; line-height: 1.95; }
.feature-link { display: inline-flex; align-items: center; gap: 16px; min-height: 44px; margin-top: 20px; padding: 10px 18px; border-radius: 24px; color: var(--md-sys-color-on-primary-container); background: var(--md-sys-color-primary-container); font-size: 13px; font-weight: 600; transition: background 180ms ease; }
.feature-link:hover { background: #c2dfaa; }
.feature-link:focus-visible { outline-color: var(--md-sys-color-primary-container); }
.feature-link .icon { width: 18px; height: 18px; }
.feature-card:nth-child(2) .feature-link { background: var(--md-sys-color-tertiary-container); color: #553a21; }

/* Without JavaScript every slide remains a normal, crawlable card. */
.carousel.is-enhanced .carousel-viewport { overflow: hidden; touch-action: pan-y pinch-zoom; }
.carousel.is-enhanced .carousel-track { display: flex; gap: 0; align-items: stretch; transform: translateX(calc(var(--slide-index, 0) * -100%)); transition: transform 480ms cubic-bezier(.2, 0, 0, 1); }
.carousel.is-enhanced .feature-card { flex: 0 0 100%; }
.carousel-controls { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-top: 16px; }
.carousel-pagination, .carousel-actions { display: flex; align-items: center; }
.carousel-pagination { gap: 0; }
.pagination-dot { display: grid; place-items: center; width: 32px; height: 44px; border: 0; padding: 0; background: transparent; border-radius: 16px; }
.pagination-dot span { display: block; width: 7px; height: 7px; border-radius: 8px; background: #b5beaa; transition: width 240ms ease, background 240ms ease; }
.pagination-dot[aria-current="true"] { width: 44px; }
.pagination-dot[aria-current="true"] span { width: 28px; background: var(--md-sys-color-primary); }
.pagination-dot:hover { background: var(--md-sys-color-surface-container); }
.carousel-actions { gap: 8px; }
.slide-counter { display: inline-flex; align-items: center; gap: 9px; margin-inline: 8px 16px; color: var(--md-sys-color-on-surface-variant); font-size: 12px; font-variant-numeric: tabular-nums; }
.counter-divider { color: #a3ad97; }
.slide-counter [data-current] { color: var(--md-sys-color-on-surface); font-weight: 700; }
.icon-button { display: grid; place-items: center; width: 44px; height: 44px; padding: 0; border: 1px solid var(--md-sys-color-outline-variant); border-radius: 50%; background: transparent; transition: background 180ms ease; }
.icon-button:hover { background: var(--md-sys-color-surface-container); }
.next-button { border-color: var(--md-sys-color-primary); color: var(--md-sys-color-on-primary); background: var(--md-sys-color-primary); }
.next-button:hover { background: #2d5818; }
.autoplay-button { border-color: transparent; color: var(--md-sys-color-on-surface-variant); }
.autoplay-button .icon { width: 18px; height: 18px; }
.site-footer { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-top: 56px; padding-block: 24px 32px; border-top: 1px solid var(--md-sys-color-outline-variant); color: var(--md-sys-color-on-surface-variant); font-size: 11px; line-height: 1.8; letter-spacing: .3px; }

.page-heading { margin: 48px 0 30px; }
.page-heading h1, .article-heading h1 { margin: 0; font-size: clamp(28px, 2.6vw, 40px); line-height: 1.5; font-weight: 600; }
.post-list { display: grid; gap: 20px; }
.post-summary, .reading-surface { padding: 32px; border-radius: 24px; background: var(--md-sys-color-surface-container-low); }
.post-summary time, .article-meta { color: var(--md-sys-color-on-surface-variant); font-size: 12px; }
.post-summary h2 { margin: 12px 0; font-size: 24px; line-height: 1.5; font-weight: 600; }
.post-summary h2 a:hover { color: var(--md-sys-color-primary); }
.post-summary p { font-size: 14px; line-height: 1.9; color: var(--md-sys-color-on-surface-variant); }
.text-link { display: inline-flex; align-items: center; gap: 10px; min-height: 44px; color: var(--md-sys-color-primary); font-size: 13px; }
.text-link .icon { width: 18px; height: 18px; }
.breadcrumbs { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin: 32px 0 20px; font-size: 12px; line-height: 1.8; color: var(--md-sys-color-on-surface-variant); overflow-wrap: anywhere; }
.breadcrumbs a { padding-block: 5px; color: var(--md-sys-color-primary); }
.reading-surface { margin-top: 32px; }
.breadcrumbs + .reading-surface { margin-top: 0; }
.article-heading { padding-bottom: 20px; margin-bottom: 24px; border-bottom: 1px solid var(--md-sys-color-outline-variant); }
.article-meta { display: flex; flex-wrap: wrap; gap: 16px; margin: 14px 0 0; }
.post-page { padding-top: 32px; }
.post-cover { position: relative; aspect-ratio: 2; overflow: hidden; border-radius: 28px; background: var(--md-sys-color-surface-container); }
.post-cover img { width: 100%; height: 100%; object-fit: cover; }
.post-title h1 { margin: 0; font-size: clamp(30px, 2.5vw, 42px); line-height: 1.5; font-weight: 600; letter-spacing: -.5px; }
.post-reading-surface { min-width: 0; margin-top: 24px; padding: 32px; border-radius: 28px; background: #ffffff; }
.post-breadcrumbs { margin: 0 0 16px; font-size: 11px; }
.post-meta { gap: 10px 16px; margin: 0 0 24px; line-height: 1.8; }
.post-meta a { color: var(--md-sys-color-primary); }
.post-related { margin-top: 36px; }
.post-related > h2 { margin: 0 0 20px; font-size: 24px; line-height: 1.5; font-weight: 600; }
.related-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.related-card { display: flex; flex-direction: column; justify-content: space-between; gap: 20px; min-width: 0; min-height: 160px; padding: 24px; border-radius: 22px; background: var(--md-sys-color-surface-container-low); transition: background 160ms ease; }
.related-card:hover { background: #e5efd7; }
.related-card h3 { margin: 0; font-size: 17px; font-weight: 500; line-height: 1.7; }
.related-card-meta { display: flex; align-items: center; justify-content: space-between; gap: 12px; color: var(--md-sys-color-on-surface-variant); font-size: 12px; }
.related-card-meta .icon { width: 20px; height: 20px; color: var(--md-sys-color-primary); }
.article-content { min-width: 0; font-size: 17px; line-height: 1.95; overflow-wrap: anywhere; }
.article-content > :first-child { margin-top: 0; }
.article-content > :last-child { margin-bottom: 0; }
.article-content p { margin: 0 0 18px; }
.article-content h1 { margin: 40px 0 20px; font-size: 30px; line-height: 1.5; }
.article-content h2 { margin: 40px 0 20px; padding: 12px 16px; border-radius: 14px; color: var(--md-sys-color-primary); background: var(--md-sys-color-surface-container-low); font-size: 24px; font-weight: 600; line-height: 1.6; }
.article-content h3 { margin: 30px 0 14px; font-size: 20px; font-weight: 600; line-height: 1.6; }
.article-content h4 { margin: 24px 0 12px; font-size: 17px; font-weight: 600; line-height: 1.7; }
.article-content h5, .article-content h6 { margin: 24px 0 12px; font-size: 16px; font-weight: 600; line-height: 1.7; }
.article-content :is(h1, h2, h3, h4, h5, h6) { scroll-margin-top: 24px; }
.article-content .headerlink { display: none; }
.article-content strong { font-weight: 600; }
.article-content a { color: var(--md-sys-color-primary); text-decoration: underline; text-underline-offset: 3px; }
.article-content a:hover { text-decoration-thickness: 2px; }
.article-content ul, .article-content ol { margin: 18px 0; padding-inline-start: 1.5em; }
.article-content li { margin-block: 8px; padding-inline-start: 4px; }
.article-content li::marker { color: var(--md-sys-color-primary); }
.article-content li > p { margin-block: 8px; }
.article-content li ul, .article-content li ol { margin-block: 8px; }
.article-content figure { margin: 28px 0; }
.article-content img { width: auto; max-width: 100%; height: auto; margin-inline: auto; border-radius: 12px; }
.article-content figcaption { margin-top: 10px; color: var(--md-sys-color-on-surface-variant); font-size: 13px; line-height: 1.7; text-align: center; }
.article-table { max-width: 100%; margin: 24px 0; overflow-x: auto; border: 1px solid var(--md-sys-color-outline-variant); border-radius: 14px; }
.article-content table { width: 100%; border-collapse: collapse; font-size: 14px; line-height: 1.8; }
.article-content th, .article-content td { min-width: 112px; padding: 12px 16px; border-bottom: 1px solid var(--md-sys-color-outline-variant); text-align: start; vertical-align: top; }
.article-content th { color: var(--md-sys-color-on-primary-container); background: var(--md-sys-color-surface-container); font-weight: 600; }
.article-content tbody tr:nth-child(even) { background: var(--md-sys-color-surface-container-low); }
.article-content tbody tr:last-child td { border-bottom: 0; }
.article-content > table { display: block; max-width: 100%; overflow-x: auto; }
.article-content pre, .article-content .highlight { max-width: 100%; overflow-x: auto; }
.article-content pre { margin: 24px 0; padding: 18px; border: 1px solid var(--md-sys-color-outline-variant); border-radius: 14px; background: var(--md-sys-color-surface-container-low); line-height: 1.7; }
.article-content code { font-family: "SFMono-Regular", Consolas, monospace; font-size: .88em; }
.article-content :not(pre) > code { padding: 2px 6px; border-radius: 5px; background: var(--md-sys-color-surface-container); }
.article-content .highlight { margin: 24px 0; padding: 14px; border: 1px solid var(--md-sys-color-outline-variant); border-radius: 14px; background: var(--md-sys-color-surface-container-low); }
.article-content .highlight table { width: 100%; border-collapse: collapse; background: transparent; }
.article-content .highlight td { min-width: 0; padding: 0; border: 0; }
.article-content .highlight tbody tr { background: transparent; }
.article-content .highlight pre { margin: 0; padding: 4px; border: 0; border-radius: 0; background: transparent; }
.article-content .highlight .gutter { width: 24px; padding-right: 12px; color: var(--md-sys-color-outline); }
.article-content blockquote { margin: 24px 0; padding: 16px 20px; border-inline-start: 4px solid var(--md-sys-color-primary); border-radius: 0 14px 14px 0; color: var(--md-sys-color-on-surface-variant); background: var(--md-sys-color-surface-container-low); }
.article-content blockquote > :last-child { margin-bottom: 0; }
.article-content hr { height: 1px; margin: 32px 0; border: 0; background: var(--md-sys-color-outline-variant); }
.article-content dl { margin: 24px 0; }
.article-content dt { margin-top: 16px; font-weight: 600; }
.article-content dd { margin-inline-start: 24px; }
.article-content details { margin: 24px 0; padding: 16px 20px; border: 1px solid var(--md-sys-color-outline-variant); border-radius: 14px; }
.article-content summary { cursor: pointer; font-weight: 600; }
.article-content details[open] summary { margin-bottom: 12px; }
.article-content mark { color: var(--md-sys-color-on-primary-container); background: var(--md-sys-color-primary-container); }
.article-content kbd { padding: 2px 6px; border: 1px solid var(--md-sys-color-outline-variant); border-radius: 5px; font-family: "SFMono-Regular", Consolas, monospace; font-size: .85em; }
.article-tags, .page-pagination { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px; }
.article-tags a, .page-pagination a, .page-pagination span { padding: 8px 16px; border-radius: 20px; background: var(--md-sys-color-surface-container); font-size: 13px; }
.page-pagination .current { color: var(--md-sys-color-on-primary); background: var(--md-sys-color-primary); }

.question-page { margin-top: 20px; }
.question-card { padding: 32px; border: 1px solid var(--md-sys-color-outline-variant); border-radius: 28px; background: #ffffff; }
.question-meta { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.question-type { display: inline-flex; align-items: center; min-height: 30px; padding: 5px 13px; border-radius: 16px; background: var(--md-sys-color-primary-container); color: var(--md-sys-color-on-primary-container); font-size: 12px; font-weight: 500; }
.question-difficulty { color: var(--md-sys-color-on-surface-variant); font-size: 12px; }
.question-stem { margin: 24px 0 28px; font-size: 21px; font-weight: 600; line-height: 2; letter-spacing: 0; }
.question-stem .katex { font-weight: 600; }
.question-options { display: grid; min-width: 0; gap: 12px; margin: 0; padding: 0; list-style: none; }
.question-option { display: flex; align-items: center; gap: 16px; min-width: 0; min-height: 76px; padding: 12px 18px; border: 1px solid var(--md-sys-color-outline-variant); border-radius: 16px; background: var(--md-sys-color-surface); }
.option-marker { display: grid; flex: 0 0 32px; place-items: center; width: 32px; height: 32px; border: 1px solid var(--md-sys-color-outline-variant); border-radius: 50%; color: var(--md-sys-color-on-surface-variant); font-size: 13px; font-weight: 600; }
.option-content { min-width: 0; font-size: 17px; line-height: 1.8; overflow-wrap: anywhere; }
.math-inline { display: inline-block; max-width: 100%; padding: .4em .12em; overflow-x: auto; overflow-y: hidden; vertical-align: middle; }
.math-display { display: block; max-width: 100%; padding: .3em 0; overflow-x: auto; }
.question-page .katex { font-size: 1.12em; }
.question-page .katex-display { margin: .3em 0; }
.question-gate { position: relative; isolation: isolate; overflow: hidden; margin-top: 24px; padding: 28px 32px 36px; border: 1px solid var(--md-sys-color-outline-variant); border-radius: 28px; background: #ffffff; }
.question-gate::before { content: ""; position: absolute; z-index: -1; inset: 0; background: linear-gradient(180deg, rgb(248 250 241 / 10%) 0%, rgb(241 246 232 / 85%) 48%, #e7f0db 100%); pointer-events: none; }
.question-gate h2 { margin: 0; color: var(--md-sys-color-on-surface-variant); font-size: 16px; font-weight: 500; }
.question-gate-content { display: flex; flex-direction: column; align-items: center; gap: 14px; margin-top: 20px; text-align: center; }
.question-qrcode { padding: 12px; border: 1px solid var(--md-sys-color-outline-variant); border-radius: 16px; background: #ffffff; }
.question-qrcode img { width: 160px; height: 160px; object-fit: contain; }
.question-scan-prompt { margin: 0; color: var(--md-sys-color-on-surface-variant); font-size: 14px; line-height: 1.6; }
.question-access-prompt { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 8px; margin: 0; font-size: 17px; line-height: 1.6; }
.question-access-prompt strong { padding: 1px 10px; border-radius: 10px; color: var(--md-sys-color-on-primary-container); background: var(--md-sys-color-primary-container); font-size: 25px; font-weight: 700; }
.question-subquestion { margin-top: 24px; }

.contact-menu { --contact-width: 80px; --contact-edge: 24px; position: fixed; z-index: 30; top: 50%; right: var(--contact-edge); display: grid; gap: 4px; width: var(--contact-width); padding: 8px; border-radius: 24px; background: #ffffff; box-shadow: 0 6px 28px rgb(26 33 24 / 13%); transform: translateY(-50%); animation: contact-float 6s cubic-bezier(.45, 0, .55, 1) infinite; }
.contact-menu:hover, .contact-menu:focus-within { animation-play-state: paused; }
.contact-menu.is-open::before { content: ""; position: absolute; top: 0; right: 100%; bottom: 0; width: 12px; }
.contact-trigger { position: relative; isolation: isolate; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 7px; width: 100%; min-height: 76px; padding: 10px 2px; overflow: hidden; border: 0; border-radius: 17px; color: var(--md-sys-color-primary); background: transparent; font-size: 12px; line-height: 1.4; transition: color 240ms cubic-bezier(.2, 0, 0, 1); }
.contact-trigger::before { content: ""; position: absolute; z-index: -1; inset: 0; border-radius: inherit; background: var(--md-sys-color-primary-container); opacity: 0; transform: scale(.65); transition: transform 420ms cubic-bezier(.16, 1, .3, 1), opacity 260ms cubic-bezier(.2, 0, 0, 1); pointer-events: none; }
.contact-trigger .icon { width: 26px; height: 26px; }
.contact-trigger:hover, .contact-item.is-open .contact-trigger { color: var(--md-sys-color-on-primary-container); }
.contact-trigger:hover::before, .contact-item.is-open .contact-trigger::before { opacity: 1; transform: scale(1); }
.contact-panel { position: absolute; top: 50%; right: calc(100% + 12px); width: 240px; max-width: calc(100vw - var(--contact-edge) - var(--contact-width) - 24px); max-height: calc(100svh - 80px); padding: 16px; overflow-y: auto; border-radius: 20px; background: #ffffff; box-shadow: 0 8px 32px rgb(26 33 24 / 16%); transform: translateY(-50%); transform-origin: right center; }
.contact-panel:not([hidden]) { animation: contact-pop 400ms cubic-bezier(.16, 1, .3, 1) both; }
.contact-panel img { width: 100%; height: auto; }
.contact-phone-panel { padding-block: 20px; text-align: center; }
.contact-phone { display: block; padding-block: 4px; color: var(--md-sys-color-primary); font-size: 22px; font-weight: 600; line-height: 1.6; white-space: nowrap; }

@keyframes contact-float {
  0%, 100% { transform: translateY(-52.5%); }
  50% { transform: translateY(-47.5%); }
}

@keyframes contact-pop {
  from { opacity: 0; transform: translate(12px, -50%) scale(.94); }
  to { opacity: 1; transform: translate(0, -50%) scale(1); }
}

@media (min-width: 1800px) {
  .feature-content { padding: 36px 40px; }
}

@media (max-width: 1023px) {
  .site-width { width: calc(100% - 64px); }
  .feature-copy h1, .feature-copy h2 { font-size: 28px; }
  .contact-menu { --contact-width: 72px; --contact-edge: 12px; padding: 6px; }
}

@media (max-width: 599px) {
  .site-width { width: calc(100% - 32px); }
  .site-header { min-height: 64px; gap: 12px; }
  .brand { font-size: 19px; gap: 8px; }
  .brand-mark { width: 36px; height: 36px; border-radius: 13px; }
  .brand-mark .icon { width: 24px; height: 24px; }
  .site-nav { gap: 0; }
  .site-nav a { padding-inline: 12px; font-size: 12px; }
  .site-main { min-height: calc(100svh - 204px); }
  .carousel { margin-top: 28px; }
  .eyebrow { font-size: 10px; letter-spacing: 1px; margin-bottom: 12px; }
  .feature-card, .carousel-viewport { border-radius: 24px; }
  .feature-image-wrap { aspect-ratio: 5 / 4; min-height: 320px; }
  .feature-category { top: 16px; left: 16px; font-size: 11px; min-height: 30px; padding: 6px 11px; }
  .feature-content { margin-top: 72px; padding: 20px; }
  .feature-copy h1, .feature-copy h2 { font-size: 22px; margin-bottom: 12px; }
  .feature-copy p { font-size: 13px; line-height: 1.95; }
  .feature-link { margin-top: 18px; font-size: 12px; }
  .carousel-controls { margin-top: 12px; gap: 0; }
  .carousel-actions { gap: 4px; }
  .slide-counter { margin-inline: 2px 8px; gap: 6px; font-size: 11px; }
  .pagination-dot { width: 24px; }
  .pagination-dot[aria-current="true"] { width: 36px; }
  .pagination-dot[aria-current="true"] span { width: 22px; }
  .site-footer { margin-top: 40px; padding-bottom: 24px; font-size: 10px; }
  .post-summary, .reading-surface { padding: 24px 20px; }
  .post-page { padding-top: 24px; }
  .post-cover { border-radius: 24px; }
  .post-title h1 { font-size: 28px; }
  .post-reading-surface { margin-top: 20px; padding: 24px 20px; border-radius: 24px; }
  .post-meta { font-size: 11px; }
  .post-related { margin-top: 28px; }
  .post-related > h2 { margin-bottom: 16px; font-size: 22px; }
  .related-grid { gap: 12px; }
  .related-card { min-height: 172px; padding: 16px; border-radius: 18px; }
  .related-card h3 { font-size: 14px; }
  .article-content { font-size: 16px; }
  .article-content h2 { padding: 10px 12px; font-size: 22px; }
  .article-content h3 { font-size: 19px; }
  .article-content th, .article-content td { padding: 10px 12px; }
  .question-card { padding: 24px 20px; border-radius: 24px; }
  .question-stem { margin: 20px 0 24px; font-size: 18px; line-height: 2; }
  .question-option { min-height: 68px; gap: 12px; padding: 10px 14px; }
  .option-marker { flex-basis: 30px; width: 30px; height: 30px; }
  .option-content { font-size: 16px; }
  .question-gate { padding: 24px 20px 28px; border-radius: 24px; }
  .question-qrcode img { width: 144px; height: 144px; }
  .question-access-prompt { gap: 6px; font-size: 15px; }
  .question-access-prompt strong { padding-inline: 8px; font-size: 23px; }
  .contact-menu { --contact-width: 56px; --contact-edge: 8px; gap: 2px; padding: 4px; border-radius: 20px; }
  .contact-trigger { min-height: 60px; gap: 5px; padding-block: 8px; border-radius: 14px; font-size: 11px; }
  .contact-trigger .icon { width: 22px; height: 22px; }
  .contact-panel { border-radius: 18px; }
  .contact-phone { font-size: 20px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; animation: none !important; }
}