:root { color-scheme: light; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif; color: #1d1d1f; background: #fafafa; font-synthesis: none; text-rendering: optimizeLegibility; -webkit-font-smoothing: antialiased; }
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 100px; }
body { margin: 0; }
a { color: inherit; text-decoration: none; }
a:focus-visible, [tabindex]:focus-visible { outline: 3px solid #6e79f5; outline-offset: 5px; border-radius: 4px; }
.skip-link { position: fixed; top: 12px; left: 16px; transform: translateY(-180%); padding: 12px 18px; background: #fff; z-index: 10; }
.skip-link:focus { transform: none; }
.reading-header { position: sticky; top: 0; z-index: 5; background: #fafafaf5; border-bottom: 1px solid #e9e9ed; backdrop-filter: blur(20px); }
.reading-header-inner { max-width: 1200px; min-height: 76px; padding: 0 32px; margin: auto; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.reading-brand { display: inline-flex; align-items: center; gap: 8px; flex-shrink: 0; }
.reading-brand img { display: block; object-fit: contain; }
.reading-brand > span { font-size: 24px; font-weight: 750; letter-spacing: -1px; }
.reading-brand small { font-size: 11px; letter-spacing: 0; margin-left: 12px; color: #737378; font-weight: 400; }
.reading-header nav { display: flex; gap: 27px; font-size: 12px; color: #616165; }
.reading-header nav a:hover, .breadcrumbs a:hover, .reading-footer a:hover { color: #4f53e8; }
.reading-button { display: inline-flex; align-items: center; justify-content: center; gap: 24px; min-height: 42px; padding: 12px 21px; background: #4f53e8; color: #fff; border-radius: 99px; font-size: 12px; font-weight: 600; white-space: nowrap; transition: background .2s; }
.reading-button:hover { background: #4145d0; }
.reading-shell { max-width: 1136px; margin: auto; padding: 0 32px; }
.breadcrumbs { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; padding-top: 36px; color: #77777d; font-size: 11px; }
.reading-intro { max-width: 930px; padding: 72px 0 64px; }
.eyebrow { font-size: 10px; line-height: 1.7; letter-spacing: 2px; color: #76767c; font-weight: 600; }
h1 { max-width: 900px; font-size: clamp(34px, 4.1vw, 56px); line-height: 1.25; letter-spacing: -2px; margin: 22px 0 28px; font-weight: 750; text-wrap: balance; }
.reading-lead { max-width: 780px; color: #57575e; font-size: 17px; line-height: 1.95; }
.reading-meta { color: #84848c; font-size: 11px; line-height: 1.9; margin-top: 28px; }
.reading-primary-action { margin-top: 15px; }
.reading-example { padding: 23px; border: 1px solid #dedee7; border-radius: 14px; background: #f0f0f5; color: #45454f; font: 13px/2 Consolas, "Microsoft YaHei", monospace; white-space: pre-wrap; overflow-wrap: anywhere; }
.reading-actions { display: flex; flex-wrap: wrap; gap: 16px 26px; margin: 25px 0 4px; }
.reading-text-link { color: #4f53e8; font-size: 12px; line-height: 1.8; }
.reading-text-link:hover { text-decoration: underline; text-underline-offset: 4px; }
.reading-layout { display: grid; grid-template-columns: 205px minmax(0, 1fr); gap: 65px; border-top: 1px solid #e1e1e6; }
.reading-body { min-width: 0; }
.heading-phrase { display: inline-block; max-width: 100%; }
.reading-toc { align-self: start; position: sticky; top: 104px; padding-top: 34px; }
.reading-toc > p { font-size: 11px; font-weight: 650; margin: 0 0 22px; }
.reading-toc nav { display: grid; gap: 18px; }
.reading-toc a { font-size: 12px; line-height: 1.75; color: #77777f; }
.reading-toc a:hover { color: #4f53e8; }
.reading-section { padding: 38px 0 42px; border-bottom: 1px solid #e5e5e9; }
.reading-section:last-child { border: 0; }
h2 { font-size: 25px; letter-spacing: -.65px; line-height: 1.45; margin: 0 0 22px; font-weight: 700; }
.reading-section p, .reading-section li { font-size: 14px; line-height: 2; color: #5d5d65; }
.reading-section p { margin: 16px 0; }
.reading-figure { margin: 24px 0; }
.reading-figure img { display: block; width: 100%; height: auto; border: 1px solid #e0e0e6; border-radius: 14px; }
.reading-figure figcaption { margin-top: 10px; color: #5d5d65; font-size: 12px; line-height: 1.7; }
.reading-section ul, .reading-section ol { padding-left: 22px; }
.reading-section li { padding-left: 6px; margin: 13px 0; }
.reading-section li::marker { color: #5559d7; }
.table-scroll { margin: 26px 0 8px; overflow-x: auto; border: 1px solid #e0e0e6; border-radius: 14px; background: #fff; }
table { width: 100%; border-collapse: collapse; min-width: 540px; text-align: left; font-size: 12px; line-height: 1.9; }
caption { position: absolute; width: 1px; height: 1px; padding: 0; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
th, td { padding: 17px 19px; vertical-align: top; border-bottom: 1px solid #e9e9ed; }
thead { background: #f3f3f6; }
th { color: #37373d; font-weight: 600; }
tbody th { min-width: 110px; }
td { color: #65656d; }
tbody tr:last-child th, tbody tr:last-child td { border-bottom: 0; }
.reading-contact { margin: 72px 0 64px; border-radius: 24px; padding: 42px 44px; background: #efeff4; display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 16px 30px; }
.reading-contact h2 { font-size: 27px; margin: 12px 0 14px; }
.reading-contact p:not(.eyebrow) { font-size: 13px; line-height: 1.8; color: #717179; margin-bottom: 0; }
.reading-email { font-size: 12px; color: #5559d7; grid-column: 2; justify-self: center; }
.reading-related { padding: 0 0 64px; }
.reading-related h2 { font-size: 20px; margin-bottom: 20px; }
.reading-related > div { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.reading-related a { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 23px 20px; border: 1px solid #e2e2e8; border-radius: 14px; font-size: 12px; background: #fff; }
.reading-related a:hover { border-color: #9c9ee8; }
.reading-related a span { color: #7779dc; }
.reading-footer { border-top: 1px solid #e2e2e8; padding: 38px max(32px, calc((100vw - 1072px) / 2)) 30px; background: #f1f1f4; color: #6e6e76; font-size: 11px; line-height: 1.9; }
.reading-footer > div > a { color: #39393f; font-weight: 600; }
.reading-footer nav { display: flex; flex-wrap: wrap; gap: 9px 24px; margin: 26px 0; }
.reading-legal { color: #85858c; font-size: 10px; border-top: 1px solid #dfdfe5; padding-top: 22px; margin-bottom: 0; }
@media (max-width: 800px) { .reading-layout { grid-template-columns: 1fr; gap: 0; } .reading-toc { position: static; padding-bottom: 30px; border-bottom: 1px solid #e2e2e8; } .reading-toc nav { grid-template-columns: repeat(2, 1fr); gap: 14px 22px; } .reading-related > div { grid-template-columns: repeat(2, 1fr); } .reading-contact { padding: 32px; } }
@media (max-width: 560px) { .reading-header-inner { min-height: 66px; padding: 0 20px; gap: 10px; } .reading-brand > span { font-size: 21px; } .reading-brand small { display: none; } .reading-header nav { display: none; } .reading-header .reading-button { min-height: 36px; padding: 10px 16px; gap: 13px; font-size: 11px; } .reading-shell { padding: 0 22px; } .breadcrumbs { padding-top: 26px; } .reading-intro { padding: 48px 0 40px; } h1 { letter-spacing: -1px; font-size: 34px; margin-top: 18px; } .reading-lead { font-size: 15px; line-height: 1.95; } .reading-meta { font-size: 10px; } .reading-toc nav { grid-template-columns: 1fr; gap: 11px; } .reading-section { padding: 30px 0; } h2 { font-size: 22px; } .reading-section p, .reading-section li { font-size: 13px; } .reading-contact { margin: 42px 0; padding: 28px 24px; grid-template-columns: 1fr; gap: 24px; border-radius: 18px; } .reading-contact h2 { font-size: 24px; } .reading-contact .reading-button { justify-self: start; } .reading-email { grid-column: auto; justify-self: start; } .reading-related { padding-bottom: 42px; } .reading-related > div { grid-template-columns: 1fr; gap: 10px; } .reading-related a { padding: 19px; } .reading-footer { padding: 30px 22px; } }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } *, *::before, *::after { transition: none !important; } }