:root{--bg: #ffffff;--fg: #1a1a1a;--fg-soft: #5a5a5a;--fg-mute: #909090;--line: #e0e0e0;--line-soft: #f0f0f0;--accent: #0a0a0a;--panel: #fafafa;--measure: 68ch;--nav-h: 64px;--font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Hiragino Kaku Gothic ProN", "Yu Gothic", "Noto Sans CJK", "Helvetica Neue", Arial, sans-serif;--font-serif: "Iowan Old Style", "Palatino Linotype", "Palatino", "URW Palladio L", "Songti SC", "STSong", "STZhongsong", "Yu Mincho", "Hiragino Mincho ProN", "Noto Serif CJK", serif}*{box-sizing:border-box}html{font-family:var(--font-body);color:var(--fg);background:var(--bg);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizeLegibility;scroll-behavior:smooth}html[lang=zh],html[lang=ja]{font-feature-settings:"palt"}body{margin:0;line-height:1.65;font-size:16.5px}a{color:var(--fg);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px;text-decoration-color:var(--line);transition:text-decoration-color .15s}a:hover,a:focus-visible{text-decoration-color:var(--fg)}h1,h2,h3{font-family:var(--font-serif);font-weight:500;letter-spacing:-.01em}h1{font-size:clamp(2.4rem,5vw,3.6rem);line-height:1.15;margin:0 0 1rem}h2{font-size:clamp(1.6rem,2.8vw,2.1rem);line-height:1.25;margin:0 0 1rem}h3{font-size:1.15rem;line-height:1.35;margin:0 0 .4rem;font-weight:600;font-family:var(--font-body);letter-spacing:0}p{max-width:var(--measure);margin:0 0 1em;color:var(--fg)}hr{border:0;border-top:1px solid var(--line);margin:3rem 0}img{max-width:100%;height:auto;display:block}.container{max-width:1180px;margin-inline:auto;padding-inline:1.25rem}.skip-link{position:absolute;left:-9999px;background:var(--fg);color:var(--bg);padding:.5rem .75rem;z-index:100}.skip-link:focus{left:1rem;top:1rem}.site-header{position:sticky;top:0;z-index:50;background:#ffffffeb;backdrop-filter:saturate(140%) blur(8px);border-bottom:1px solid var(--line)}.header-inner{display:flex;align-items:center;gap:1.5rem;min-height:var(--nav-h)}.brand{display:inline-flex;align-items:baseline;gap:.5rem;text-decoration:none;color:var(--fg);font-weight:600}.brand-mark{font-family:var(--font-serif);font-size:1.35rem;color:var(--fg-soft)}.brand-text{font-family:var(--font-serif);font-size:1.15rem;letter-spacing:.02em}.site-nav{display:none;margin-left:auto;gap:1.5rem;font-size:.95rem}.site-nav a{text-decoration:none;color:var(--fg-soft)}.site-nav a:hover,.site-nav a:focus-visible{color:var(--fg)}.nav-github{color:var(--fg)!important}.lang-switch{display:flex;gap:.35rem;font-size:.85rem;margin-left:auto}.lang-link{text-decoration:none;padding:.2rem .5rem;color:var(--fg-mute);border-radius:2px}.lang-link.active{color:var(--fg);background:var(--line-soft)}.lang-link:hover{color:var(--fg)}@media(min-width:780px){.site-nav{display:flex}.lang-switch{margin-left:0}}.site-footer{border-top:1px solid var(--line);padding:3rem 0 4rem;margin-top:6rem;color:var(--fg-soft);font-size:.9rem}.footer-inner{display:flex;justify-content:space-between;align-items:flex-start;gap:2rem;flex-wrap:wrap}.footer-tagline{margin:0;max-width:44ch}.footer-links{list-style:none;margin:0;padding:0;display:flex;gap:1.5rem;flex-wrap:wrap}.footer-links a{color:var(--fg-soft)}section{padding:5rem 0}section+section{border-top:1px solid var(--line-soft)}section>.container>*{max-width:var(--measure)}.section-title{font-family:var(--font-serif);color:var(--fg)}.section-intro{color:var(--fg-soft);max-width:var(--measure)}.item-grid{display:grid;gap:1.25rem 2rem;grid-template-columns:1fr;margin:2rem 0 0;max-width:none}@media(min-width:720px){.item-grid{grid-template-columns:1fr 1fr}}@media(min-width:1000px){.item-grid.three{grid-template-columns:repeat(3,1fr)}}.item-card{padding:1.4rem 1.5rem;border:1px solid var(--line);border-radius:4px;background:var(--bg)}.item-card h3{margin-bottom:.5rem}.item-card p{color:var(--fg-soft);font-size:.94rem;margin:0}.item-card .num{display:block;font-family:var(--font-serif);color:var(--fg-mute);font-size:.9rem;margin-bottom:.4rem}.btn-row{display:flex;gap:.9rem;flex-wrap:wrap;margin-top:1.75rem}.btn{display:inline-block;padding:.7rem 1.2rem;border:1px solid var(--fg);color:var(--fg);text-decoration:none;font-size:.95rem;border-radius:3px;transition:background .15s,color .15s}.btn:hover,.btn:focus-visible{background:var(--fg);color:var(--bg)}.btn.btn-ghost{border-color:var(--line);color:var(--fg-soft)}.btn.btn-ghost:hover,.btn.btn-ghost:focus-visible{border-color:var(--fg);color:var(--fg);background:transparent}.hero{padding:6rem 0 4rem}.hero-title{font-size:clamp(3rem,8vw,5rem);font-family:var(--font-serif)}.hero-subtitle{color:var(--fg-soft);font-size:clamp(1.05rem,1.6vw,1.3rem);margin-top:.5rem;max-width:44ch}.hero-tagline{margin-top:1.5rem;font-size:1rem;color:var(--fg-soft);max-width:var(--measure)}.banner-block{margin-top:2rem;border:1px solid var(--line);border-radius:4px;overflow:hidden;background:var(--panel);max-width:none}.banner-block img{width:100%}.banner-caption{padding:.9rem 1.1rem;color:var(--fg-mute);font-size:.85rem;border-top:1px solid var(--line)}a:focus-visible,button:focus-visible{outline:2px solid var(--fg);outline-offset:2px}