/* Self-contained system fonts keep the preview usable without third-party resources. */
:root{--bg:#edf3fa;--ink:#142b46;--muted:#667a91;--line:#dce5ef;--white:#fff;--green:#087e69;--mint:#c5f6df;--navy:#122a43;--blue:#4569b1;--shadow:0 16px 45px #243d5d0a;--radius:20px;font-family:'DM Sans','PingFang SC','Microsoft YaHei',system-ui,sans-serif;color:var(--ink);font-size:16px;font-synthesis:none}*{box-sizing:border-box}body{margin:0;background:var(--bg);line-height:1.65}button,input,textarea,select{font:inherit}button,a,input,select,textarea{-webkit-tap-highlight-color:transparent}button,a{touch-action:manipulation}button{cursor:pointer}a{color:inherit;text-decoration:none}button:disabled{cursor:not-allowed;opacity:.5}button:focus-visible,a:focus-visible{outline:3px solid #309fca;outline-offset:4px}input:focus,textarea:focus,select:focus{outline:2px solid #078b7460;outline-offset:1px;border-color:var(--green)}h1,h2,h3,p{margin:0}h1,h2,h3{line-height:1.25}svg{width:20px;height:20px;vertical-align:middle;flex-shrink:0}button{border:0;background:none;color:inherit}button 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