:root{--bg-page:#f5f5f7;--bg:#ffffff;--surface:#ffffff;--surface-muted:rgba(0, 0, 0, .04);--text:#424245;--text-h:#1d1d1f;--text-muted:#6e6e73;--border:rgba(0, 0, 0, .08);--accent:#000000;--accent-hover:#333333;--accent-ring:rgba(0, 0, 0, .22);--shadow-flat:0 1px 4px rgba(0, 0, 0, .04);--shadow-lift:0 4px 20px rgba(0, 0, 0, .06);--radius-lg:18px;--radius-md:10px;--radius-sm:8px;--container:min(980px, 100%);--header-h:52px;--text-xs:.75rem;--text-sm:.8125rem;--text-base:.875rem;--text-md:.9375rem;--text-lg:1rem;--text-xl:1.125rem;--sans:ui-sans-serif, system-ui, -apple-system, "SF Pro Display", "SF Pro Text", "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;font-family:var(--sans);font-size:16px;line-height:1.6;color:var(--text);background-color:var(--bg-page);font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}*,*:before,*:after{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0}h1,h2,h3{color:var(--text-h);letter-spacing:-.025em}a{color:var(--accent)}#app{min-height:100vh;background:var(--bg-page)}.site-container{width:var(--container);margin:0 auto;padding:0 clamp(16px,4vw,24px)}.site-page{display:flex;flex-direction:column;min-height:100vh;padding-bottom:10px}.site-main{flex:1;padding-bottom:clamp(40px,6vw,40px)}.site-section{padding:clamp(44px,7vw,44px) 0}.site-section+.site-section{margin-top:0}.site-section--hero{padding-top:60px;background:linear-gradient(180deg,#ffffff 0%,#fafafc 55%,var(--bg-page) 100%)}.site-section__title{margin:0;font-size:clamp(1.625rem,3.5vw,2.125rem);font-weight:600;line-height:1.15;letter-spacing:-.03em}.site-section__lead{margin:14px auto 0;max-width:36em;font-size:var(--text-md);line-height:1.65;color:var(--text-muted)}.site-section__head{margin-bottom:clamp(28px,4vw,40px);text-align:center}.site-section__head--compact{margin-bottom:clamp(22px,3vw,32px)}.site-panel{padding:clamp(32px,5vw,48px);border-radius:var(--radius-lg);background:var(--bg);box-shadow:var(--shadow-flat)}.site-header{position:sticky;top:0;z-index:50;height:var(--header-h);border-bottom:1px solid transparent;background:#ffffffe0;backdrop-filter:saturate(180%) blur(16px);-webkit-backdrop-filter:saturate(180%) blur(16px);cursor:default}.site-header a,.site-header button{cursor:pointer}.site-header.is-scrolled{border-bottom-color:var(--border)}.site-header__inner{display:flex;align-items:center;justify-content:space-between;gap:16px;height:100%;position:relative;z-index:1}.site-header__brand{display:inline-flex;align-items:center;gap:10px;color:var(--text-h);font-size:var(--text-lg);font-weight:600;text-decoration:none;letter-spacing:-.02em;cursor:pointer}.site-header__logo{flex-shrink:0;width:30px;height:30px;object-fit:contain;cursor:pointer;pointer-events:none}.site-header__nav{display:none;align-items:center;gap:2px}@media (min-width: 768px){.site-header__nav{display:flex}}.site-header__link{padding:7px 12px;border-radius:var(--radius-sm);color:var(--text-muted);font-size:var(--text-sm);font-weight:400;text-decoration:none;cursor:pointer;transition:color .15s,background .15s}.site-header__link:hover,.site-header__link.is-active{color:var(--text-h);background:var(--surface-muted)}.site-header__cta{display:inline-flex;align-items:center;justify-content:center;padding:7px 14px;border-radius:var(--radius-sm);background:var(--accent);color:#fff!important;font-size:var(--text-sm);font-weight:500;text-decoration:none;white-space:nowrap;cursor:pointer;transition:background .15s}.site-header__cta:hover{background:var(--accent-hover)}.site-btn{display:inline-flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;min-height:50px;padding:12px 20px;border-radius:var(--radius-md);border:1px solid transparent;font:inherit;text-decoration:none;cursor:pointer;transition:background .15s ease,border-color .15s ease,color .15s ease,opacity .15s ease}.site-btn:focus-visible{outline:none;box-shadow:0 0 0 3px var(--accent-ring)}.site-btn--primary{background:var(--accent);color:#fff}.site-btn--primary:hover{background:var(--accent-hover)}.site-btn--secondary{background:var(--bg);color:var(--text-h);border-color:#00000024}.site-btn--secondary:hover{border-color:#00000047;background:var(--bg)}.site-btn__label{font-size:var(--text-base);font-weight:500}.site-btn__meta{font-size:var(--text-xs);opacity:.72;font-weight:400}.site-card{padding:clamp(22px,3vw,28px);border:none;border-radius:var(--radius-lg);background:var(--bg);box-shadow:var(--shadow-flat)}.site-footer{background:var(--bg-page);text-align:center}