:root{--brand: #1a6fe0;--brand-dark: #0f57b8;--ink: #1f2733;--ink-soft: #4a5568;--ink-mute: #5f6a7d;--line: #e6e9ef;--bg: #ffffff;--bg-soft: #f6f8fc;--bg-card: #ffffff;--warn-bg: #fff8e6;--warn-line: #f3cf6b;--note-bg: #eef4ff;--note-line: #b9cdf6;--ok: #16915b;--ok-bg: #e7f6ee;--radius: 12px;--maxw: 1080px;--prosew: 760px;--shadow: 0 1px 2px rgba(20, 40, 90, .05), 0 6px 22px rgba(20, 40, 90, .06)}*{box-sizing:border-box}html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}body{margin:0;color:var(--ink);background:var(--bg);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,Hiragino Sans GB,Source Han Sans SC,Noto Sans CJK SC,sans-serif;font-size:16.5px;line-height:1.8;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}a{color:var(--brand);text-decoration:none}a:hover{color:var(--brand-dark);text-decoration:underline}:focus-visible{outline:2px solid 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34px;margin-top:40px}.disclaimer{font-size:13px;line-height:1.85;color:var(--ink-mute);margin:0 0 12px}.footer-nav{display:flex;flex-wrap:wrap;gap:8px 18px;margin:0 0 12px;font-size:14px}.footer-nav a{color:var(--ink-soft)}.footer-nav a:hover{color:var(--brand)}.footer-meta{display:flex;flex-wrap:wrap;gap:8px 18px;font-size:13px;color:var(--ink-mute)}.footer-meta a{color:var(--ink-mute)}.footer-meta a:hover{color:var(--brand)}.center-box{text-align:center;padding:60px 0}.center-box h1{font-size:64px;margin:0;color:var(--brand)}@media(max-width:640px){body{font-size:16px}.brand-tag{display:none}.nav{overflow-x:auto;-webkit-overflow-scrolling:touch;flex-wrap:nowrap}.nav-link{padding:6px 9px;font-size:13.5px}.grid{grid-template-columns:1fr}.main{padding-top:20px}}