:root{--bg:#D7E4E6;--deep:#C4D4D6;--paper:#F3F7F7;--soft:#E4EEEF;--ink:#1E2C2E;--text:#2A3A3C;--muted:#4A6064;--quiet:#6A8084;--teal:#4A8A8C;--sand:#C4A070;--line:rgba(30,44,46,.14);--focus:rgba(74,138,140,.42);--shadow:0 12px 28px rgba(30,44,46,.08)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font-family:Arial,"Microsoft YaHei",sans-serif;font-size:15px;line-height:1.7;overflow-x:hidden}a{color:inherit;text-decoration:none}button{font:inherit}.topbar{position:fixed;z-index:60;top:0;left:0;right:0;height:20px;background:var(--ink);color:var(--paper);font-size:12px}.topbar-inner,.masthead-inner{max-width:980px;margin:auto;padding:0 16px;display:flex;align-items:center;justify-content:space-between}.topbar-inner{height:20px}.text-button{border:0;background:none;color:var(--paper);padding:0 4px;cursor:pointer}.masthead{position:fixed;z-index:59;top:20px;left:0;right:0;height:54px;background:var(--paper);border-bottom:1px solid 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.section-image-gap{margin-bottom:16px}.section-image-top{margin-top:16px}.centered-head{text-align:center}.centered-lead{margin-left:auto;margin-right:auto}