:root{--background:#f3f5f7;--surface:#ffffff;--surface-muted:#eef1f4;--ink:#17202a;--muted:#64707d;--line:#dce1e6;--accent:#087f5b;--accent-dark:#056647;--sent:#d9f7be;--shadow:0 8px 24px rgba(24,32,42,0.08)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--background);color:var(--ink);font-family:Arial,Microsoft YaHei,sans-serif;letter-spacing:0}button,input{font:inherit}.primary-button,.secondary-button{display:inline-flex;align-items:center;justify-content:center;gap:7px;min-height:40px;padding:0 14px;border:1px solid transparent;border-radius:6px;text-decoration:none;cursor:pointer}.primary-button{background:var(--accent);color:white}.primary-button:hover{background:var(--accent-dark)}.secondary-button{border-color:var(--line);background:var(--surface);color:var(--ink)}.primary-button.compact{min-height:34px;padding:0 11px;font-size:13px}.primary-button:disabled,.secondary-button:disabled{cursor:wait;opacity:.65}.shell{width:min(780px,calc(100% - 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